imgui-luau/build/ImGui.luau

--!optimize 2
-- GENERATED by tools/bundle.py from imgui/*.lua - do not edit

local __FILES, __LOADED = {}, {}
function IM_INCLUDE(name)
    local r = __LOADED[name]
    if r == nil then r = __FILES[name](); if r == nil then r = true end; __LOADED[name] = r end
    return r
end

__FILES['imgui.lua'] = function()
--- ImGui Sincerely WIP
-- (Core Code)

--- Flags:
-- IMGUI_DISABLE_OBSOLETE_FUNCTIONS = true -- This flag is not implemented

-- NOTE: you must implement ImStd.ImFileOpen if you are not in GMod
IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS = true -- Don't implement ImStd.ImFileOpen/ImStd.ImFileClose/ImStd.ImFileRead/ImFileWrite so you can implement them yourself

IMGUI_DISABLE_DEBUG_TOOLS = false -- Disable metrics/debugger and other debug tools: ShowMetricsWindow(), ShowDebugLogWindow() and ShowIDStackToolWindow() will be empty

--- @type ImGuiContext?
local GImGui = nil

ImGui = {}

ImStd = {} -- Contains functions that originally don't belong to cpp namespaces

-- IM_INCLUDE(name) is provided by the bundle (see tools/bundle.py): runs the bundled file once, returns its result.

function ImGui._GetTypeFunc() return type end

local function LUA_TableConstructorWrapper(T, size, userdata)
    local p = {}
    for i = 1, size do p[i] = T() end
    return p
end

local GImAllocatorAllocFunc = LUA_TableConstructorWrapper
local GImAllocatorFreeFunc = function(p0, p1, p2) end
local GImAllocatorUserData = nil

--- @param constructor function
--- @param size        int
function ImGui.MemAlloc(constructor, size)
    local p = GImAllocatorAllocFunc(constructor, size, GImAllocatorUserData)
    local ctx = GImGui
    if ctx then
        ImGui.DebugAllocHook(ctx.DebugAllocInfo, ctx.FrameCount, p, size)
    end
    return p
end

-- This does not set `owner[field]` to nil!
--- @param owner table
--- @param field string|int
function ImGui.MemFree(owner, field)
    if owner ~= nil then
        local ctx = GImGui
        if ctx then
            ImGui.DebugAllocHook(ctx.DebugAllocInfo, ctx.FrameCount, owner, -1)
        end
    end
    return GImAllocatorFreeFunc(owner, field, GImAllocatorUserData)
end

--- @param info        ImGuiDebugAllocInfo
--- @param frame_count int
--- @param ptr         table
--- @param size        size_t
function ImGui.DebugAllocHook(info, frame_count, ptr, size)
    local entry = info.LastEntriesBuf[info.LastEntriesIdx]
    if entry.FrameCount ~= frame_count then
        info.LastEntriesIdx = info.LastEntriesIdx % (#info.LastEntriesBuf) + 1
        entry = info.LastEntriesBuf[info.LastEntriesIdx]
        entry.FrameCount = frame_count
        entry.AllocCount = 0
        entry.FreeCount = 0
    end
    if size ~= -1 then
        -- print(string.format("[%05d] MemAlloc(%d) -> %p", frame_count, size, ptr))
        entry.AllocCount = entry.AllocCount + 1
        info.TotalAllocCount = info.TotalAllocCount + 1
    else
        -- print(string.format("[%05d] MemFree(%p)", frame_count, ptr))
        entry.FreeCount = entry.FreeCount + 1
        info.TotalFreeCount = info.TotalFreeCount + 1
    end
end

IM_INCLUDE"imgui_h.lua"

IM_INCLUDE"imgui_internal.lua"

IM_INCLUDE"imgui_draw.lua"

IM_INCLUDE"imgui_widgets.lua"

IM_INCLUDE"imgui_tables.lua"

IM_INCLUDE"imgui_tabs.lua"

IM_INCLUDE"imgui_dragdrop.lua"

IM_INCLUDE"imgui_docking.lua"

local IMGUI_DEBUG_NAV_SCORING = false
local IMGUI_DEBUG_NAV_RECTS = false

local FONT_DEFAULT_SIZE_BASE = 20

local WINDOWS_RESIZE_FROM_EDGES_FEEDBACK_TIMER = 0.04
local WINDOWS_MOUSE_WHEEL_SCROLL_LOCK_TIMER    = 0.70

local TOOLTIP_DEFAULT_OFFSET_MOUSE = ImVec2(16, 10)   -- Multiplied by g.Style.MouseCursorScale
local TOOLTIP_DEFAULT_OFFSET_TOUCH = ImVec2(0, -20)   -- Multiplied by g.Style.MouseCursorScale
local TOOLTIP_DEFAULT_PIVOT_TOUCH  = ImVec2(0.5, 1.0) -- Multiplied by g.Style.MouseCursorScale

local IMGUI_VIEWPORT_DEFAULT_ID = 0x11111111

local string = string
ImFormatString = string.format -- TODO: an simplified version that operates on byte tables directly?

--- @module "imstd_minstdio"
ImStd.sscanf = IM_INCLUDE"imstd_minstdio.lua"

local math = math
local bit32 = bit32

---------------------------------------------------------------------------------------
-- [SECTION] MISC HELPERS/UTILITIES (File functions)
---------------------------------------------------------------------------------------

--- This closes the _file.
--- @param _file any # File object
function IM_FILE_CLOSE(_file) end

--- This returns the size of _file in bytes.
--- @param _file any # File object
--- @return int
function IM_FILE_SIZE(_file) return -1 end

--- This writes _str into _file.
--- @param _file any    # File object
--- @param _str  string
function IM_FILE_WRITE(_file, _str) end

--- This reads the specified _count of chars and returns them as a binary string.
--- @param _file any  # File object
--- @param _count int
--- @return string
function IM_FILE_READ(_file, _count) return "" end

--- This opens the file at _filename in _mode and returns the File object.
--- @param _filename string
--- @param _mode     string # e.g. "rb"
--- @return any
function ImStd.ImFileOpen(_filename, _mode) end

--- [GMod] Platform specific
if gmod then
    IM_FILE_CLOSE = FindMetaTable("File").Close --- @type function
    IM_FILE_SIZE  = FindMetaTable("File").Size  --- @type function
    IM_FILE_WRITE = FindMetaTable("File").Write --- @type function
    IM_FILE_READ  = FindMetaTable("File").Read  --- @type function
end

if not IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS then
    --- [GMod] Another Platform specific
    if gmod then
        function ImStd.ImFileOpen(filename, mode) return file.Open(filename, mode, "GAME") end
    end

    function ImStd.ImFileClose(f) IM_FILE_CLOSE(f) end
    function ImStd.ImFileGetSize(f) return IM_FILE_SIZE(f) end

    --- @param f     any   # File object
    --- @param data  table # 1-based table to store result data
    --- @param count int   # Amount of bytes to read from `f`
    function ImStd.ImFileRead(f, data, count)
        local CHUNK_SIZE = 8000 -- We don't read byte by byte
        local offset = 0

        while offset < count do
            local read_size = math.min(CHUNK_SIZE, count - offset)
            local str = IM_FILE_READ(f, read_size)

            local bytes = {string.byte(str, 1, read_size)}
            for i = 1, read_size do
                data[offset + i] = bytes[i]
            end

            offset = offset + read_size
        end
    end

    --- @param filename string
    --- @param mode     string
    --- @return table?, integer?
    function ImStd.ImFileLoadToMemory(filename, mode)
        local f = ImStd.ImFileOpen(filename, mode)
        if not f then return end

        local file_size = ImStd.ImFileGetSize(f)
        if file_size <= 0 then
            ImStd.ImFileClose(f)
            return
        end

        local file_data = {}
        ImStd.ImFileRead(f, file_data, file_size)
        if #file_data == 0 then
            ImStd.ImFileClose(f)
            return
        end

        ImStd.ImFileClose(f)

        return file_data, file_size
    end
end

--- Forward Declarations
local CalcNextScrollFromScrollTargetAndClamp

local MT = ImGui.GetMetatables()

--- @param scale_factor float
function MT.ImGuiStyle:ScaleAllSizes(scale_factor)
    self._MainScale = self._MainScale * scale_factor

    self.WindowPadding    = ImTrunc(self.WindowPadding * scale_factor)
    self.WindowRounding   = ImTrunc(self.WindowRounding * scale_factor)
    self.WindowBorderSize = ImTrunc(self.WindowBorderSize * scale_factor)
    self.WindowMinSize    = ImTrunc(self.WindowMinSize * scale_factor)
    self.WindowBorderHoverPadding = ImTrunc(self.WindowBorderHoverPadding * scale_factor)
    self.ChildRounding     = ImTrunc(self.ChildRounding * scale_factor)
    self.ChildBorderSize   = ImTrunc(self.ChildBorderSize * scale_factor)
    self.PopupRounding     = ImTrunc(self.PopupRounding * scale_factor)
    self.PopupBorderSize   = ImTrunc(self.PopupBorderSize * scale_factor)
    self.FramePadding      = ImTrunc(self.FramePadding * scale_factor)
    self.FrameBorderSize   = ImTrunc(self.FrameBorderSize * scale_factor)
    self.FrameRounding     = ImTrunc(self.FrameRounding * scale_factor)
    self.ItemSpacing       = ImTrunc(self.ItemSpacing * scale_factor)
    self.ItemInnerSpacing  = ImTrunc(self.ItemInnerSpacing * scale_factor)
    self.CellPadding       = ImTrunc(self.CellPadding * scale_factor)
    self.TouchExtraPadding = ImTrunc(self.TouchExtraPadding * scale_factor)
    self.IndentSpacing     = ImTrunc(self.IndentSpacing * scale_factor)
    self.ColumnsMinSpacing = ImTrunc(self.ColumnsMinSpacing * scale_factor)
    self.ScrollbarSize     = ImTrunc(self.ScrollbarSize * scale_factor)
    self.ScrollbarRounding = ImTrunc(self.ScrollbarRounding * scale_factor)
    self.ScrollbarPadding  = ImTrunc(self.ScrollbarPadding * scale_factor)
    self.GrabMinSize       = ImTrunc(self.GrabMinSize * scale_factor)
    self.GrabRounding      = ImTrunc(self.GrabRounding * scale_factor)
    self.LogSliderDeadzone = ImTrunc(self.LogSliderDeadzone * scale_factor)
    self.ImageRounding     = ImTrunc(self.ImageRounding * scale_factor)
    self.ImageBorderSize   = ImTrunc(self.ImageBorderSize * scale_factor)
    self.TabRounding       = ImTrunc(self.TabRounding * scale_factor)
    self.TabBorderSize     = ImTrunc(self.TabBorderSize * scale_factor)
    self.TabMinWidthBase   = ImTrunc(self.TabMinWidthBase * scale_factor)
    self.TabMinWidthShrink = ImTrunc(self.TabMinWidthShrink * scale_factor)
    self.TabCloseButtonMinWidthSelected   = (self.TabCloseButtonMinWidthSelected > 0.0 and self.TabCloseButtonMinWidthSelected ~= FLT_MAX) and ImTrunc(self.TabCloseButtonMinWidthSelected * scale_factor) or self.TabCloseButtonMinWidthSelected
    self.TabCloseButtonMinWidthUnselected = (self.TabCloseButtonMinWidthUnselected > 0.0 and self.TabCloseButtonMinWidthUnselected ~= FLT_MAX) and ImTrunc(self.TabCloseButtonMinWidthUnselected * scale_factor) or self.TabCloseButtonMinWidthUnselected
    self.TabBarBorderSize         = ImTrunc(self.TabBarBorderSize * scale_factor)
    self.TabBarOverlineSize       = ImTrunc(self.TabBarOverlineSize * scale_factor)
    self.TreeLinesSize            = ImTrunc(self.TreeLinesSize * scale_factor)
    self.TreeLinesRounding        = ImTrunc(self.TreeLinesRounding * scale_factor)
    self.MenuItemRounding         = ImTrunc(self.MenuItemRounding * scale_factor)
    self.SelectableRounding       = ImTrunc(self.SelectableRounding * scale_factor)
    self.DragDropTargetRounding   = ImTrunc(self.DragDropTargetRounding * scale_factor)
    self.DragDropTargetBorderSize = ImTrunc(self.DragDropTargetBorderSize * scale_factor)
    self.DragDropTargetPadding    = ImTrunc(self.DragDropTargetPadding * scale_factor)
    self.ColorMarkerSize          = ImTrunc(self.ColorMarkerSize * scale_factor)
    self.InputTextCursorSize      = ImTrunc(self.InputTextCursorSize * scale_factor)
    self.SeparatorSize            = ImTrunc(self.SeparatorSize * scale_factor)
    self.SeparatorTextBorderSize  = ImTrunc(self.SeparatorTextBorderSize * scale_factor)
    self.SeparatorTextPadding     = ImTrunc(self.SeparatorTextPadding * scale_factor)
    self.DockingSeparatorSize     = ImTrunc(self.DockingSeparatorSize * scale_factor)
    self.DisplayWindowPadding     = ImTrunc(self.DisplayWindowPadding * scale_factor)
    self.DisplaySafeAreaPadding   = ImTrunc(self.DisplaySafeAreaPadding * scale_factor)
    self.MouseCursorScale         = ImTrunc(self.MouseCursorScale * scale_factor)
end

local ImGuiResizeGripDef = {
    {CornerPosN = ImVec2(1, 1), InnerDir = ImVec2(-1, -1), AngleMin12 = 0, AngleMax12 = 3}, -- Bottom right grip
    {CornerPosN = ImVec2(0, 1), InnerDir = ImVec2( 1, -1), AngleMin12 = 3, AngleMax12 = 6}  -- Bottom left
}

--- [1] Left, [2] Right, [3] Up, [4] Down
local ImGuiResizeBorderDef = {
    {InnerDir = ImVec2( 1,  0), SegmentN1 = ImVec2( 0,  1), SegmentN2 = ImVec2( 0,  0), OuterAngle = IM_PI * 1.00},
    {InnerDir = ImVec2(-1,  0), SegmentN1 = ImVec2( 1,  0), SegmentN2 = ImVec2( 1,  1), OuterAngle = IM_PI * 0.00},
    {InnerDir = ImVec2( 0,  1), SegmentN1 = ImVec2( 0,  0), SegmentN2 = ImVec2( 1,  0), OuterAngle = IM_PI * 1.50},
    {InnerDir = ImVec2( 0, -1), SegmentN1 = ImVec2( 1,  1), SegmentN2 = ImVec2( 0,  1), OuterAngle = IM_PI * 0.50}
}

--- @param window       ImGuiWindow
--- @param border_n     int
--- @param perp_padding float
--- @param thickness    float
--- @return ImRect
--- @nodiscard
local function GetResizeBorderRect(window, border_n, perp_padding, thickness)
    local rect = window:Rect()
    if thickness == 0.0 then
        ImVec2_CopyV(rect.Max, rect.Max.x - 1, rect.Max.y - 1)
    end
    if border_n == ImGuiDir.Left then
        return ImRect(rect.Min.x - thickness, rect.Min.y + perp_padding, rect.Min.x + thickness, rect.Max.y - perp_padding)
    end
    if border_n == ImGuiDir.Right then
        return ImRect(rect.Max.x - thickness, rect.Min.y + perp_padding, rect.Max.x + thickness, rect.Max.y - perp_padding)
    end
    if border_n == ImGuiDir.Up then
        return ImRect(rect.Min.x + perp_padding, rect.Min.y - thickness, rect.Max.x - perp_padding, rect.Min.y + thickness)
    end
    if border_n == ImGuiDir.Down then
        return ImRect(rect.Min.x + perp_padding, rect.Max.y - thickness, rect.Max.x - perp_padding, rect.Max.y + thickness)
    end
    IM_ASSERT(false)
    return ImRect()
end

--- @param data table|number
--- @param size int?         # size = -1 to indicate that `data` is a single number
--- @param seed int?
--- @return int
function ImHashData(data, size, seed)
    seed = seed or 0

    local FNV_OFFSET_BASIS = 0x811C9DC5
    local FNV_PRIME = 0x01000193

    local hash = bit32.bxor(FNV_OFFSET_BASIS, seed)

    if size == -1 then --- @cast data number
        hash = bit32.bxor(hash, data)
        hash = bit32.band(hash * FNV_PRIME, 0xFFFFFFFF)
    else
        size = size or #data
        for i = 1, size do
            hash = bit32.bxor(hash, data[i])
            hash = bit32.band(hash * FNV_PRIME, 0xFFFFFFFF)
        end
    end

    return hash
end

-- Use FNV1a, as one ImGui FIXME suggested
--- @param str  string
--- @param size int?
--- @param seed int?
--- @return int
function ImHashStr(str, size, seed)
    if size == nil then size = #str end
    if seed == nil then seed = 0    end

    if str == "" or size == 0 then
        return seed -- need to match cpp code edge case behavior while using FNV ourselves
    end

    local FNV_OFFSET_BASIS = 0x811C9DC5
    local FNV_PRIME = 0x01000193

    local hash = bit32.bxor(FNV_OFFSET_BASIS, seed)

    local i = 1
    local c
    while i <= size do
        c = string.byte(str, i)

        -- `###` to reset back to initial hash value
        if c == 35 and string.byte(str, i + 1) == 35 and string.byte(str, i + 2) == 35 then
            hash = bit32.bxor(FNV_OFFSET_BASIS, seed)
            i = i + 2
        else
            hash = bit32.bxor(hash, c)
            hash = bit32.band(hash * FNV_PRIME, 0xFFFFFFFF)
        end

        i = i + 1
    end

    return hash
end

do --[[CharFromUtf8]]

local lengths = {1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 2, 2, 2, 2, 3, 3, 4, 0}
local masks   = {0x00, 0x7f, 0x1f, 0x0f, 0x07}
local mins    = {0x400000, 0, 0x80, 0x800, 0x10000}
local shiftc  = {0, 18, 12, 6, 0}
local shifte  = {0, 6, 4, 2, 0}

local s = {0, 0, 0, 0}

--- @param in_text     ImString
--- @param pos         int
--- @param in_text_end int
--- @return int          wanted
--- @return unsigned_int out_char
function ImStd.ImTextCharFromUtf8(in_text, pos, in_text_end)
    local len = lengths[bit32.rshift(ImStrByte(in_text, pos), 3) + 1]
    local wanted = len > 0 and len or 1

    if in_text_end == nil then
        in_text_end = pos + wanted
    end

    s[1] = (pos     < in_text_end) and ImStrByte(in_text, pos)     or 0
    s[2] = (pos + 1 < in_text_end) and ImStrByte(in_text, pos + 1) or 0
    s[3] = (pos + 2 < in_text_end) and ImStrByte(in_text, pos + 2) or 0
    s[4] = (pos + 3 < in_text_end) and ImStrByte(in_text, pos + 3) or 0

    local out_char
    out_char = bit32.lshift(bit32.band(s[1], masks[len + 1]), 18)
    out_char = bit32.bor(out_char, bit32.lshift(bit32.band(s[2], 0x3f), 12))
    out_char = bit32.bor(out_char, bit32.lshift(bit32.band(s[3], 0x3f),  6))
    out_char = bit32.bor(out_char, bit32.lshift(bit32.band(s[4], 0x3f),  0))
    out_char = bit32.rshift(out_char, shiftc[len + 1])

    local e = 0
    e = bit32.lshift((out_char < mins[len + 1]) and 1 or 0, 6)
    e = bit32.bor(e, bit32.lshift((bit32.rshift(out_char, 11) == 0x1b) and 1 or 0, 7))
    e = bit32.bor(e, bit32.lshift((out_char > IM_UNICODE_CODEPOINT_MAX) and 1 or 0, 8))
    e = bit32.bor(e, bit32.rshift(bit32.band(s[2], 0xc0), 2))
    e = bit32.bor(e, bit32.rshift(bit32.band(s[3], 0xc0), 4))
    e = bit32.bor(e, bit32.rshift(s[4], 6))
    e = bit32.bxor(e, 0x2a)
    e = bit32.rshift(e, shifte[len + 1])

    if e ~= 0 then
        wanted = ImMin(wanted, (s[1] ~= 0 and 1 or 0) + (s[2] ~= 0 and 1 or 0) + (s[3] ~= 0 and 1 or 0) + (s[4] ~= 0 and 1 or 0))
        out_char = IM_UNICODE_CODEPOINT_INVALID
    end

    return wanted, out_char
end

end

--- @param buf      char[]
--- @param buf_size int
--- @param c        unsigned_int
local function ImTextCharToUtf8_inline(buf, buf_size, c)
    if c < 0x80 then
        buf[1] = c
        return 1
    end
    if c < 0x800 then
        if buf_size < 2 then
            return 0
        end
        buf[1] = (0xc0 + bit32.rshift(c, 6))
        buf[2] = (0x80 + bit32.band(c, 0x3f))
        return 2
    end
    if c < 0x10000 then
        if buf_size < 3 then
            return 0
        end
        buf[1] = (0xe0 + bit32.rshift(c, 12))
        buf[2] = (0x80 + bit32.band(bit32.rshift(c, 6), 0x3f))
        buf[3] = (0x80 + bit32.band(c, 0x3f))
        return 3
    end
    if c <= 0x10FFFF then
        if buf_size < 4 then
            return 0
        end
        buf[1] = (0xf0 + bit32.rshift(c, 18))
        buf[2] = (0x80 + bit32.band(bit32.rshift(c, 12), 0x3f))
        buf[3] = (0x80 + bit32.band(bit32.rshift(c, 6), 0x3f))
        buf[4] = (0x80 + bit32.band(c, 0x3f))
        return 4
    end

    -- Invalid code point, the max unicode is 0x10FFFF
    return 0
end

--- @param out_buf [char, char, char, char, char]
--- @param c       unsigned_int
function ImStd.ImTextCharToUtf8(out_buf, c)
    local count = ImTextCharToUtf8_inline(out_buf, 5, c)
    out_buf[count + 1] = 0
    return count
end

--- @param in_text     ImString
--- @param pos         int
--- @param in_text_end int
--- @return int
function ImStd.ImTextCountUtf8BytesFromChar(in_text, pos, in_text_end)
    local bytes, unused = ImStd.ImTextCharFromUtf8(in_text, pos, in_text_end)
    return bytes
end

--- @param text          ImString
--- @param in_text_start int
--- @param in_p          int
function ImStd.ImTextFindPreviousUtf8Codepoint(text, in_text_start, in_p)
    while in_p > in_text_start do
        in_p = in_p - 1
        if bit32.band(ImStrByte(text, in_p), 0xC0) ~= 0x80 then
            return in_p
        end
    end
    return in_text_start
end

--- @param text          ImString
--- @param in_text_start int
--- @param in_text_end   int
--- @param in_p          int
--- @return int
function ImStd.ImTextFindValidUtf8CodepointEnd(text, in_text_start, in_text_end, in_p)
    if in_text_start == in_p then
        return in_text_start
    end

    local prev = ImStd.ImTextFindPreviousUtf8Codepoint(text, in_text_start, in_p)
    local prev_c_len, prev_c = ImStd.ImTextCharFromUtf8(text, prev, in_text_end)

    -- Check if the previous character is valid and fits within the range
    if prev_c ~= IM_UNICODE_CODEPOINT_INVALID and prev_c_len <= (in_p - prev) then
        return in_p
    end
    return prev
end

--- @param a ImVec2
--- @param b ImVec2
--- @param p ImVec2
--- @return ImVec2
--- @nodiscard
function ImStd.ImLineClosestPoint(a, b, p)
    local ap = p - a
    local ab_dir = b - a
    local dot = ap.x * ab_dir.x + ap.y * ab_dir.y
    if dot < 0.0 then
        return a
    end
    local ab_len_sqr = ab_dir.x * ab_dir.x + ab_dir.y * ab_dir.y
    if dot > ab_len_sqr then
        return b
    end
    return a + ab_dir * (dot / ab_len_sqr)
end

--- @param a ImVec2
--- @param b ImVec2
--- @param c ImVec2
--- @param p ImVec2
function ImStd.ImTriangleContainsPoint(a, b, c, p)
    local b1 = ((p.x - b.x) * (a.y - b.y) - (p.y - b.y) * (a.x - b.x)) < 0.0
    local b2 = ((p.x - c.x) * (b.y - c.y) - (p.y - c.y) * (b.x - c.x)) < 0.0
    local b3 = ((p.x - a.x) * (c.y - a.y) - (p.y - a.y) * (c.x - a.x)) < 0.0
    return (b1 == b2) and (b2 == b3)
end

--- @param a ImVec2
--- @param b ImVec2
--- @param c ImVec2
--- @param p ImVec2
--- @return float, float, float
function ImStd.ImTriangleBarycentricCoords(a, b, c, p)
    local v0 = b - a
    local v1 = c - a
    local v2 = p - a

    local denom = v0.x * v1.y - v1.x * v0.y
    local out_v = (v2.x * v1.y - v1.x * v2.y) / denom
    local out_w = (v0.x * v2.y - v2.x * v0.y) / denom
    local out_u = 1.0 - out_v - out_w

    return out_u, out_v, out_w
end

--- @param a ImVec2
--- @param b ImVec2
--- @param c ImVec2
--- @param p ImVec2
--- @return ImVec2
--- @nodiscard
function ImStd.ImTriangleClosestPoint(a, b, c, p)
    local proj_ab = ImStd.ImLineClosestPoint(a, b, p)
    local proj_bc = ImStd.ImLineClosestPoint(b, c, p)
    local proj_ca = ImStd.ImLineClosestPoint(c, a, p)

    local dist2_ab = ImLengthSqr(p - proj_ab)
    local dist2_bc = ImLengthSqr(p - proj_bc)
    local dist2_ca = ImLengthSqr(p - proj_ca)

    local m = ImMin(dist2_ab, ImMin(dist2_bc, dist2_ca))

    if m == dist2_ab then
        return proj_ab
    elseif m == dist2_bc then
        return proj_bc
    else
        return proj_ca
    end
end

--- @param dst     char[]
--- @param dst_pos int
--- @param src     char[]
--- @param src_pos int
--- @param count   size_t
function ImStd.ImStrncpy(dst, dst_pos, src, src_pos, count)
    if count < 1 then
        return
    end
    if count > 1 then
        ImStd.memmove(dst, dst_pos, src, src_pos, count - 1)
    end
    dst[dst_pos + (count - 1)] = 0
end

--- @param str      char[]
--- @param mid_line int
--- @param begin    int
function ImStd.ImStrbol(str, mid_line, begin)
    IM_ASSERT_PARANOID(mid_line >= begin and mid_line <= #str)
    while mid_line > begin and str[mid_line - 1] ~= 10 do
        mid_line = mid_line - 1
    end
    return mid_line
end

--- @param buf char[]
function ImStd.ImStrTrimBlanks(buf)
    local p = 1 -- buf_begin
    while buf[p] == 32 or buf[p] == 9 do
        p = p + 1
    end
    local p_start = p
    while buf[p] ~= 0 do
        p = p + 1
    end
    while p > p_start and (buf[p - 1] == 32 or buf[p - 1] == 9) do
        p = p - 1
    end
    if p_start > 1 then
        ImStd.memmove(buf, 1, buf, p_start, p - p_start)
    end
    buf[p - p_start + 1] = 0
end

function ImGui.UpdateCurrentFontSize(restore_font_size_after_scaling)
    local g = GImGui
    local window = g.CurrentWindow

    g.Style.FontSizeBase = g.FontSizeBase

    -- if (window ~= nil and window.SkipItems) then
    --     local table = g.CurrentTable
    --     if (table == nil or (table.CurrentColumn ~= -1 and table.Columns[table.CurrentColumn].IsSkipItems == false)) then
    --         return
    --     end
    -- end

    local final_size = (restore_font_size_after_scaling > 0.0) and restore_font_size_after_scaling or 0.0
    if final_size == 0.0 then
        final_size = g.FontSizeBase

        final_size = final_size * g.Style.FontScaleMain
        final_size = final_size * g.Style.FontScaleDpi
        if window ~= nil then
            final_size = final_size * window.FontWindowScale
        end
    end

    final_size = ImGui.GetRoundedFontSize(final_size)
    final_size = ImClamp(final_size, 4.0, IMGUI_FONT_SIZE_MAX)
    if (g.Font ~= nil and bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.RendererHasTextures) ~= 0) then
        g.Font.CurrentRasterizerDensity = g.FontRasterizerDensity
    end
    g.FontSize = final_size
    g.FontBaked = (g.Font ~= nil and window ~= nil) and g.Font:GetFontBaked(final_size) or nil
    g.FontBakedScale = (g.FontBaked ~= nil) and (g.FontSize / g.FontBaked.Size) or 0.0
    g.DrawListSharedData.FontSize = g.FontSize
    g.DrawListSharedData.FontScale = g.FontBakedScale
end

function ImGui.SetCurrentFont(font, font_size_before_scaling, font_size_after_scaling)
    local g = GImGui

    g.Font = font
    g.FontSizeBase = font_size_before_scaling
    ImGui.UpdateCurrentFontSize(font_size_after_scaling)

    if font ~= nil then
        IM_ASSERT(font and font:IsLoaded())
        local atlas = font.OwnerAtlas
        g.DrawListSharedData.FontAtlas = atlas
        g.DrawListSharedData.Font = font
        ImFontAtlasUpdateDrawListsSharedData(atlas)
        if (g.CurrentWindow ~= nil) then
            g.CurrentWindow.DrawList:_SetTexture(atlas.TexRef)
        end
    end
end

function ImGui.PushFont(font, font_size_base)
    local g = GImGui

    if font == nil then
        font = g.Font
    end

    IM_ASSERT(font ~= nil)
    IM_ASSERT(font_size_base >= 0.0)

    g.FontStack:push_back(ImFontStackData(font, g.FontSizeBase, g.FontSize))

    if font_size_base == 0.0 then
        font_size_base = g.FontSizeBase
    end

    ImGui.SetCurrentFont(font, font_size_base, 0.0)
end

function ImGui.PopFont()
    local g = GImGui

    if (g.FontStack.Size <= 0) then
        IM_ASSERT_USER_ERROR(0, "Calling PopFont() too many times!")

        return
    end

    local font_stack_data = g.FontStack:back()
    ImGui.SetCurrentFont(font_stack_data.Font, font_stack_data.FontSizeBeforeScaling, font_stack_data.FontSizeAfterScaling)

    g.FontStack:pop_back()
end

function ImGui.UpdateTexturesNewFrame()
    local g = GImGui
    local has_textures = bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.RendererHasTextures) ~= 0
    for _, atlas in g.FontAtlases:iter() do
        if (atlas.OwnerContext == g) then
            ImFontAtlasUpdateNewFrame(atlas, g.FrameCount, has_textures)
        else
            IM_ASSERT(atlas.Builder ~= nil and atlas.Builder.FrameCount ~= -1)
            IM_ASSERT(atlas.RendererHasTextures == has_textures)
        end
    end

    for _, tex in g.UserTextures:iter() do
        ImTextureDataUpdateNewFrame(tex)
    end
end

function ImGui.UpdateTexturesEndFrame()
    local g = GImGui
    g.PlatformIO.Textures:resize(0)
    for _, atlas in g.FontAtlases:iter() do
        for _, tex in atlas.TexList:iter() do
            tex.RefCount = atlas.RefCount
            g.PlatformIO.Textures:push_back(tex)
        end
    end
    for _, tex in g.UserTextures:iter() do
        g.PlatformIO.Textures:push_back(tex)
    end
end

function ImGui.UpdateFontsNewFrame()
    local g = GImGui
    if (bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.RendererHasTextures) == 0) then
        for _, atlas in g.FontAtlases:iter() do
            atlas.Locked = true
        end
    end

    if (g.Style._NextFrameFontSizeBase ~= 0.0) then
        g.Style.FontSizeBase = g.Style._NextFrameFontSizeBase
        g.Style._NextFrameFontSizeBase = 0.0
    end

    local font = ImGui.GetDefaultFont()
    if g.Style.FontSizeBase <= 0.0 then
        g.Style.FontSizeBase = ((font.LegacySize > 0.0) and font.LegacySize or FONT_DEFAULT_SIZE_BASE)
    end

    g.Font = font
    g.FontSizeBase = g.Style.FontSizeBase
    g.FontSize = 0.0
    local font_stack_data = ImFontStackData(font, g.Style.FontSizeBase, g.Style.FontSizeBase)
    ImGui.SetCurrentFont(font_stack_data.Font, font_stack_data.FontSizeBeforeScaling, 0.0)
    g.FontStack:push_back(font_stack_data)
    IM_ASSERT(g.Font:IsLoaded())
end

function ImGui.UpdateFontsEndFrame()
    ImGui.PopFont()
end

--- @return ImFont
function ImGui.GetDefaultFont()
    local g = GImGui
    local atlas = g.IO.Fonts
    if (atlas.Builder == nil or atlas.Fonts.Size == 0) then
        ImFontAtlasBuildMain(atlas)
    end
    return g.IO.FontDefault and g.IO.FontDefault or atlas.Fonts[1]
end

--- @param atlas ImFontAtlas
function ImGui.RegisterFontAtlas(atlas)
    local g = GImGui
    if (g.FontAtlases.Size == 0) then
        IM_ASSERT(atlas == g.IO.Fonts)
    end
    atlas.RefCount = atlas.RefCount + 1
    g.FontAtlases:push_back(atlas)
    ImFontAtlasAddDrawListSharedData(atlas, g.DrawListSharedData)
    for _, tex in atlas.TexList:iter() do
        tex.RefCount = atlas.RefCount
    end
end

--- @param atlas ImFontAtlas
function ImGui.UnregisterFontAtlas(atlas)
    local g = GImGui
    IM_ASSERT(atlas.RefCount > 0)
    ImFontAtlasRemoveDrawListSharedData(atlas, g.DrawListSharedData)
    g.FontAtlases:find_erase(atlas)
    atlas.RefCount = atlas.RefCount - 1
    for _, tex in atlas.TexList:iter() do
        tex.RefCount = atlas.RefCount
    end
end

function ImGui.GetCurrentContext()
    return GImGui
end

--- @param ctx ImGuiContext?
function ImGui.SetCurrentContext(ctx)
    GImGui = ctx

    ImGui._SetCurrentContext_Internal(ctx)
    ImGui._SetCurrentContext_Widgets(ctx)
    ImGui._SetCurrentContext_Tables(ctx)
end

--- @param alloc_func ImGuiMemAllocFunc
--- @param free_func  ImGuiMemFreeFunc
--- @param user_data  any
function ImGui.SetAllocatorFunctions(alloc_func, free_func, user_data)
    GImAllocatorAllocFunc = alloc_func
    GImAllocatorFreeFunc = free_func
    GImAllocatorUserData = user_data
end

--- @param key  ImGuiLocKey
--- @param text string
--- @return ImGuiLocEntry
--- @nodiscard
--- @package
local function ImGuiLocEntry(key, text)
    return { Key = key, Text = text }
end

local GLocalizationEntriesEnUS = {
    ImGuiLocEntry(ImGuiLocKey.VersionStr,                    "ImGui Sincerely WIP"),
    ImGuiLocEntry(ImGuiLocKey.TableSizeOne,                  "Size column to fit###SizeOne"),
    ImGuiLocEntry(ImGuiLocKey.TableSizeAllFit,               "Size all columns to fit###SizeAll"),
    ImGuiLocEntry(ImGuiLocKey.TableSizeAllDefault,           "Size all columns to default###SizeAll"),
    ImGuiLocEntry(ImGuiLocKey.TableReset,                    "Reset"),
    ImGuiLocEntry(ImGuiLocKey.TableResetOrder,               "Reset order###ResetOrder"),
    ImGuiLocEntry(ImGuiLocKey.TableResetVisibility,          "Reset visibility###ResetVisibility"),
    ImGuiLocEntry(ImGuiLocKey.WindowingMainMenuBar,          "(Main menu bar)"),
    ImGuiLocEntry(ImGuiLocKey.WindowingPopup,                "(Popup)"),
    ImGuiLocEntry(ImGuiLocKey.WindowingUntitled,             "(Untitled)"),
    ImGuiLocEntry(ImGuiLocKey.OpenLink_s,                    "Open '%s'"),
    ImGuiLocEntry(ImGuiLocKey.CopyLink,                      "Copy Link###CopyLink"),
    ImGuiLocEntry(ImGuiLocKey.DockingHideTabBar,             "Hide tab bar###HideTabBar"),
    ImGuiLocEntry(ImGuiLocKey.DockingHoldShiftToDock,        "Hold SHIFT to enable Docking window."),
    ImGuiLocEntry(ImGuiLocKey.DockingDragToUndockOrMoveNode, "Click and drag to move or undock whole node."),
}

function ImGui.Initialize()
    local g = GImGui
    IM_ASSERT(not g.Initialized and not g.SettingsLoaded)

    ImGui.WindowSettingsAddSettingsHandler()
    if ImGui.TableSettingsAddSettingsHandler then ImGui.TableSettingsAddSettingsHandler() end
    ImGui.DockContextInitialize(g)
    ImGui.LocalizeRegisterEntries(GLocalizationEntriesEnUS, #GLocalizationEntriesEnUS)

    local viewport = ImGuiViewportP()
    viewport.ID = IMGUI_VIEWPORT_DEFAULT_ID
    viewport.Idx = 1
    viewport.PlatformWindowCreated = true
    viewport.Flags = ImGuiViewportFlags.OwnedByApp
    g.Viewports:push_back(viewport)
    g.ViewportCreatedCount = g.ViewportCreatedCount + 1
    g.PlatformIO.Viewports:push_back(g.Viewports.Data[1])

    for key = ImGuiKey.NamedKey_BEGIN, ImGuiKey.NamedKey_END - 1 do
        if (key >= ImGuiKey.K0 and key <= ImGuiKey.K9) or (key >= ImGuiKey.A and key <= ImGuiKey.Z) or (key >= ImGuiKey.Keypad0 and key <= ImGuiKey.Keypad9)
            or key == ImGuiKey.Tab or key == ImGuiKey.Space or key == ImGuiKey.Apostrophe or key == ImGuiKey.Comma or key == ImGuiKey.Minus or key == ImGuiKey.Period
            or key == ImGuiKey.Slash or key == ImGuiKey.Semicolon or key == ImGuiKey.Equal or key == ImGuiKey.LeftBracket or key == ImGuiKey.RightBracket or key == ImGuiKey.GraveAccent
            or key == ImGuiKey.KeypadDecimal or key == ImGuiKey.KeypadDivide or key == ImGuiKey.KeypadMultiply or key == ImGuiKey.KeypadSubtract or key == ImGuiKey.KeypadAdd or key == ImGuiKey.KeypadEqual then
            g.KeysMayBeCharInput:SetBit(key + 1)
        end
    end

    local atlas = g.IO.Fonts
    g.DrawListSharedData.Context = g
    ImGui.RegisterFontAtlas(atlas)

    g.Initialized = true
end

--- @param shared_font_atlas? ImFontAtlas
function ImGui.CreateContext(shared_font_atlas)
    local prev_ctx = ImGui.GetCurrentContext()
    local ctx = ImGuiContext(shared_font_atlas)
    ImGui.SetCurrentContext(ctx)
    ImGui.Initialize()
    if prev_ctx ~= nil then
        ImGui.SetCurrentContext(prev_ctx) -- Restore previous context if any, else keep new one
    end
    return ctx
end

--- @param ctx? ImGuiContext
function ImGui.DestroyContext(ctx)
    local prev_ctx = ImGui.GetCurrentContext()
    if ctx == nil then
        ctx = prev_ctx
    end
    ImGui.SetCurrentContext(ctx)
    ImGui.Shutdown()
    ImGui.SetCurrentContext((prev_ctx ~= ctx) and prev_ctx or nil)
end

--- @param window ImGuiWindow
--- @return any
function ImGui.FindWindowSettingsByWindow(window)
    local g = GImGui
    if window.SettingsOffset ~= -1 then
        return g.SettingsWindows[window.SettingsOffset + 1]
    end
    return ImGui.FindWindowSettingsByID(window.ID)
end

--- @param id ImGuiID
--- @return any
function ImGui.FindWindowSettingsByID(id)
    local g = GImGui
    for _, settings in g.SettingsWindows:iter() do
        if settings.ID == id and not settings.WantDelete then
            return settings
        end
    end
    return nil
end

--- @param window ImGuiWindow
--- @return ImGuiWindow?
function ImGui.FindFrontMostVisibleChildWindow(window)
    for n = window.DC.ChildWindows.Size, 1, -1 do
        if ImGui.IsWindowActiveAndVisible(window.DC.ChildWindows.Data[n]) then
            return ImGui.FindFrontMostVisibleChildWindow(window.DC.ChildWindows.Data[n])
        end
    end
    return window
end

--- @param window ImGuiWindow
--- @param cond ImGuiCond
--- @param allow bool
local function SetWindowConditionAllowFlags(window, cond, allow)
    if allow then
        window.SetWindowPosAllowFlags = bit32.bor(window.SetWindowPosAllowFlags, cond)
        window.SetWindowSizeAllowFlags = bit32.bor(window.SetWindowSizeAllowFlags, cond)
        window.SetWindowCollapsedAllowFlags = bit32.bor(window.SetWindowCollapsedAllowFlags, cond)
    else
        window.SetWindowPosAllowFlags = bit32.band(window.SetWindowPosAllowFlags, bit32.bnot(cond))
        window.SetWindowSizeAllowFlags = bit32.band(window.SetWindowSizeAllowFlags, bit32.bnot(cond))
        window.SetWindowCollapsedAllowFlags = bit32.band(window.SetWindowCollapsedAllowFlags, bit32.bnot(cond))
    end
end

--- @param window ImGuiWindow
--- @param settings ImGuiWindowSettings
local function ApplyWindowSettings(window, settings)
    if settings ~= nil then
        local main_viewport = ImGui.GetMainViewport()
        ImVec2_Copy(window.ViewportPos, main_viewport.Pos)
        if (settings.ViewportId ~= 0) then
            window.ViewportId = settings.ViewportId
            ImVec2_Copy(window.ViewportPos, settings.ViewportPos)
        end
        window.Pos = ImTrunc(ImVec2(settings.Pos.x + window.ViewportPos.x, settings.Pos.y + window.ViewportPos.y))
        if settings.Size.x > 0 and settings.Size.y > 0 then
            local size = ImVec2(ImTrunc(settings.Size.x), ImTrunc(settings.Size.y))
            ImVec2_Copy(window.Size, size)
            ImVec2_Copy(window.SizeFull, size)
            window.AutoFitFramesX = 0; window.AutoFitFramesY = 0
        end
        window.Collapsed = settings.Collapsed
        window.DockId = settings.DockId or 0
        window.DockOrder = settings.DockOrder or -1
        SetWindowConditionAllowFlags(window, ImGuiCond.FirstUseEver, false)
    end

    -- So first call to CalcWindowContentSizes() doesn't return crazy values
    ImVec2_Copy(window.DC.CursorStartPos, window.Pos)
    ImVec2_Copy(window.DC.CursorMaxPos, window.Pos)
    ImVec2_Copy(window.DC.IdealMaxPos, window.Pos)
    if (bit32.band(window.Flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0) then
        window.AutoFitFramesX = 2; window.AutoFitFramesY = 2
        window.AutoFitOnlyGrows = false
    else
        window.AutoFitFramesX = (window.Size.x <= 0.0) and 2 or 0
        window.AutoFitFramesY = (window.Size.y <= 0.0) and 2 or 0
        window.AutoFitOnlyGrows = (window.AutoFitFramesX > 0) or (window.AutoFitFramesY > 0)
    end
end

--- @param window ImGuiWindow
--- @param settings ImGuiWindowSettings
local function InitOrLoadWindowSettings(window, settings)
    -- Initial window state with e.g. default/arbitrary window position
    -- Use SetNextWindowPos() with the appropriate condition flag to change the initial position of a window.
    local main_viewport = ImGui.GetMainViewport()
    ImVec2_Copy(window.Pos, main_viewport.Pos + ImVec2(60, 60))
    ImVec2_Copy(window.Size, ImVec2(0, 0))
    ImVec2_Copy(window.SizeFull, ImVec2(0, 0))
    ImVec2_Copy(window.ViewportPos, main_viewport.Pos)
    window.SetWindowPosAllowFlags = bit32.bor(ImGuiCond.Always, ImGuiCond.Once, ImGuiCond.FirstUseEver, ImGuiCond.Appearing)
    window.SetWindowSizeAllowFlags = window.SetWindowPosAllowFlags
    window.SetWindowCollapsedAllowFlags = window.SetWindowPosAllowFlags
    window.SetWindowDockAllowFlags = window.SetWindowPosAllowFlags
    ApplyWindowSettings(window, settings)
    if settings ~= nil then
        -- TODO: settings.LastUsedDate = g.SessionDate
    end
end

--- @param name string
--- @param flags ImGuiWindowFlags
--- @return ImGuiWindow
local function CreateNewWindow(name, flags)
    local g = GImGui

    local window_id = ImHashStr(name)

    local window = ImGuiWindow(g, name)

    window.ID = window_id
    window.Flags = flags

    g.WindowsById[window_id] = window

    local settings = nil
    if bit32.band(window.Flags, ImGuiWindowFlags.NoSavedSettings) == 0 then
        settings = ImGui.FindWindowSettingsByWindow(window)
        if settings ~= nil then
            window.SettingsOffset = g.SettingsWindows:index_from_ptr(settings)
        end
    end

    InitOrLoadWindowSettings(window, settings)

    if bit32.band(flags, ImGuiWindowFlags.NoBringToFrontOnFocus) ~= 0 then
        g.Windows:push_front(window)
    else
        g.Windows:push_back(window)
    end

    return window
end


---------------------------------------------------------------------------------------
-- [SECTION] SETTINGS (in-memory .ini; Roblox has no disk)
---------------------------------------------------------------------------------------

function ImGui.UpdateSettings()
    local g = GImGui
    if not g.SettingsLoaded then
        if g.IO.IniFilename then ImGui.LoadIniSettingsFromDisk(g.IO.IniFilename) end
        g.SettingsLoaded = true
    end
    if g.SettingsDirtyTimer > 0.0 then
        g.SettingsDirtyTimer = g.SettingsDirtyTimer - g.IO.DeltaTime
        if g.SettingsDirtyTimer <= 0.0 then
            -- No disk: always let the user know they can call SaveIniSettingsToMemory()
            g.IO.WantSaveIniSettings = true
            g.SettingsDirtyTimer = 0.0
        end
    end
end

--- @param window? ImGuiWindow
function ImGui.MarkIniSettingsDirty(window)
    local g = GImGui
    if window ~= nil and bit32.band(window.Flags, ImGuiWindowFlags.NoSavedSettings) ~= 0 then return end
    if g.SettingsDirtyTimer <= 0.0 then
        g.SettingsDirtyTimer = g.IO.IniSavingRate
    end
end

--- @param handler ImGuiSettingsHandler
function ImGui.AddSettingsHandler(handler)
    local g = GImGui
    IM_ASSERT(ImGui.FindSettingsHandler(handler.TypeName) == nil)
    if handler.TypeHash == 0 or handler.TypeHash == nil then handler.TypeHash = ImHashStr(handler.TypeName) end
    g.SettingsHandlers:push_back(handler)
end

function ImGui.RemoveSettingsHandler(type_name)
    local g = GImGui
    local handler = ImGui.FindSettingsHandler(type_name)
    if handler then g.SettingsHandlers:find_erase(handler) end
end

function ImGui.FindSettingsHandler(type_name)
    local g = GImGui
    local type_hash = ImHashStr(type_name)
    for _, handler in g.SettingsHandlers:iter() do
        if handler.TypeHash == type_hash then return handler end
    end
    return nil
end

function ImGui.ClearIniSettings()
    local g = GImGui
    g.SettingsIniData = ""
    for _, handler in g.SettingsHandlers:iter() do
        if handler.ClearAllFn then handler.ClearAllFn(g, handler) end
    end
end

function ImGui.CleanupIniSettings(args)
    local g = GImGui
    if args.DiscardAll then
        for _, handler in g.SettingsHandlers:iter() do
            if (args.TypeHashFilter or 0) == 0 or handler.TypeHash == args.TypeHashFilter then
                if handler.ClearAllFn then handler.ClearAllFn(g, handler) end
            end
        end
    end
end

function ImGui.LoadIniSettingsFromDisk(ini_filename)
    local data = ImStd.ImFileLoadToMemory and ImStd.ImFileLoadToMemory(ini_filename, "rb")
    if not data or #data == 0 then return end
    local parts = {}
    for i = 1, #data do parts[i] = string.char(data[i]) end
    ImGui.LoadIniSettingsFromMemory(table.concat(parts))
end

--- Zero-tolerance, cheap .ini parsing. `ini_size` ignored (Lua strings know their length).
function ImGui.LoadIniSettingsFromMemory(ini_data, ini_size)
    local g = GImGui
    IM_ASSERT(g.Initialized)
    if ini_size and ini_size > 0 then ini_data = ini_data:sub(1, ini_size) end
    g.SettingsIniData = ini_data

    for _, handler in g.SettingsHandlers:iter() do
        if handler.ReadInitFn then handler.ReadInitFn(g, handler) end
    end

    local entry_data, entry_handler = nil, nil
    for line in ini_data:gmatch("[^\r\n]+") do
        local c = line:sub(1, 1)
        if c == ";" then
            -- comment
        elseif c == "[" and line:sub(-1) == "]" then
            -- "[Type][Name]" (Name may contain [] characters)
            local type_name, name = line:match("^%[([^%]]*)%]%[(.*)%]$")
            if type_name then
                entry_handler = ImGui.FindSettingsHandler(type_name)
                entry_data = entry_handler and entry_handler.ReadOpenFn(g, entry_handler, name) or nil
            else
                entry_handler, entry_data = nil, nil
            end
        elseif entry_handler ~= nil and entry_data ~= nil then
            entry_handler.ReadLineFn(g, entry_handler, entry_data, line)
        end
    end
    g.SettingsLoaded = true

    for _, handler in g.SettingsHandlers:iter() do
        if handler.ApplyAllFn then handler.ApplyAllFn(g, handler) end
    end
end

function ImGui.SaveIniSettingsToDisk(ini_filename)
    local g = GImGui
    g.SettingsDirtyTimer = 0.0
    -- Roblox: no disk. Call SaveIniSettingsToMemory() and persist the string yourself (e.g. DataStore).
end

--- @return string ini_data, int size
function ImGui.SaveIniSettingsToMemory()
    local g = GImGui
    g.SettingsDirtyTimer = 0.0
    local buf = ImGuiTextBuffer()
    for _, handler in g.SettingsHandlers:iter() do
        handler.WriteAllFn(g, handler, buf)
    end
    g.SettingsIniData = buf:c_str()
    return g.SettingsIniData, #g.SettingsIniData
end

function ImGui.CreateNewWindowSettings(name)
    local g = GImGui
    if not g.IO.ConfigDebugIniSettings then
        -- ImHashSkipUncontributingPrefix: skip everything up to the last "###"
        local p = name:match("^.*()###")
        if p then name = name:sub(p) end
    end
    local settings = ImGuiWindowSettings()
    settings.ID = ImHashStr(name)
    settings.Name = name
    g.SettingsWindows:push_back(settings)
    return settings
end

function ImGui.ClearWindowSettings(name)
    local window = ImGui.FindWindowByName(name)
    if window ~= nil then
        window.Flags = bit32.bor(window.Flags, ImGuiWindowFlags.NoSavedSettings)
        InitOrLoadWindowSettings(window, nil)
        if window.DockId and window.DockId ~= 0 and ImGui.DockContextProcessUndockWindow then
            ImGui.DockContextProcessUndockWindow(GImGui, window, true)
        end
    end
    local settings = window and ImGui.FindWindowSettingsByWindow(window) or ImGui.FindWindowSettingsByID(ImHashStr(name))
    if settings then settings.WantDelete = true end
end

local function WindowSettingsHandler_ClearAll(ctx, handler)
    local g = ctx
    for _, window in g.Windows:iter() do window.SettingsOffset = -1 end
    g.SettingsWindows:clear()
end

local function WindowSettingsHandler_ReadOpen(ctx, handler, name)
    local id = ImHashStr(name)
    local settings = ImGui.FindWindowSettingsByID(id)
    if settings then
        local fresh = ImGuiWindowSettings()
        for k, v in pairs(fresh) do settings[k] = v end
        settings.Name = name
    else
        settings = ImGui.CreateNewWindowSettings(name)
    end
    settings.ID = id
    settings.WantApply = true
    return settings
end

local function WindowSettingsHandler_ReadLine(ctx, handler, settings, line)
    local x, y = line:match("^Pos=(%-?%d+),(%-?%d+)")
    if x then ImVec2_CopyV(settings.Pos, tonumber(x), tonumber(y)) return end
    x, y = line:match("^Size=(%-?%d+),(%-?%d+)")
    if x then ImVec2_CopyV(settings.Size, tonumber(x), tonumber(y)) return end
    x = line:match("^ViewportId=0x(%x+)")
    if x then settings.ViewportId = tonumber(x, 16) return end
    x, y = line:match("^ViewportPos=(%-?%d+),(%-?%d+)")
    if x then ImVec2_CopyV(settings.ViewportPos, tonumber(x), tonumber(y)) return end
    x = line:match("^Collapsed=(%d+)")
    if x then settings.Collapsed = tonumber(x) ~= 0 return end
    x = line:match("^IsChild=(%d+)")
    if x then settings.IsChild = tonumber(x) ~= 0 return end
    x = line:match("^LastUsed=(%d+)")
    if x then settings.LastUsedDate = tonumber(x) return end
    x, y = line:match("^DockId=0x(%x+),(%-?%d+)")
    if x then settings.DockId = tonumber(x, 16); settings.DockOrder = tonumber(y) return end
    x = line:match("^DockId=0x(%x+)")
    if x then settings.DockId = tonumber(x, 16); settings.DockOrder = -1 return end
    x = line:match("^ClassId=0x(%x+)")
    if x then settings.ClassId = tonumber(x, 16) return end
end

local function WindowSettingsHandler_ApplyAll(ctx, handler)
    local g = ctx
    for _, settings in g.SettingsWindows:iter() do
        if settings.WantApply then
            local window = ImGui.FindWindowByID(settings.ID)
            if window then ApplyWindowSettings(window, settings) end
            settings.WantApply = false
        end
    end
end

local function WindowSettingsHandler_WriteAll(ctx, handler, buf)
    local g = ctx
    for _, window in g.Windows:iter() do
        if bit32.band(window.Flags, ImGuiWindowFlags.NoSavedSettings) == 0 then
            local settings = ImGui.FindWindowSettingsByWindow(window)
            if not settings then
                settings = ImGui.CreateNewWindowSettings(window.Name)
                window.SettingsOffset = g.SettingsWindows:index_from_ptr(settings)
            end
            IM_ASSERT(settings.ID == window.ID)
            ImVec2_CopyV(settings.Pos, ImTrunc(window.Pos.x - window.ViewportPos.x), ImTrunc(window.Pos.y - window.ViewportPos.y))
            ImVec2_CopyV(settings.Size, ImTrunc(window.SizeFull.x), ImTrunc(window.SizeFull.y))
            settings.ViewportId = window.ViewportId or 0
            ImVec2_CopyV(settings.ViewportPos, ImTrunc(window.ViewportPos.x), ImTrunc(window.ViewportPos.y))
            settings.DockId = window.DockId or 0
            settings.ClassId = window.WindowClass and window.WindowClass.ClassId or 0
            settings.DockOrder = window.DockOrder or -1
            settings.Collapsed = window.Collapsed
            settings.IsChild = (window.RootWindow ~= window)
            settings.WantDelete = false
        end
    end

    for _, settings in g.SettingsWindows:iter() do
        if not settings.WantDelete then
            buf:appendf("[%s][%s]\n", handler.TypeName, settings.Name)
            if settings.IsChild then
                buf:appendf("IsChild=1\n")
                buf:appendf("Size=%d,%d\n", settings.Size.x, settings.Size.y)
            else
                if settings.ViewportId ~= 0 and settings.ViewportId ~= IMGUI_VIEWPORT_DEFAULT_ID then
                    buf:appendf("ViewportPos=%d,%d\n", settings.ViewportPos.x, settings.ViewportPos.y)
                    buf:appendf("ViewportId=0x%08X\n", settings.ViewportId)
                end
                if settings.Pos.x ~= 0 or settings.Pos.y ~= 0 or settings.ViewportId == IMGUI_VIEWPORT_DEFAULT_ID then
                    buf:appendf("Pos=%d,%d\n", settings.Pos.x, settings.Pos.y)
                end
                if settings.Size.x ~= 0 or settings.Size.y ~= 0 then
                    buf:appendf("Size=%d,%d\n", settings.Size.x, settings.Size.y)
                end
                buf:appendf("Collapsed=%d\n", settings.Collapsed and 1 or 0)
                if settings.DockId ~= 0 then
                    if settings.DockOrder == -1 then
                        buf:appendf("DockId=0x%08X\n", settings.DockId)
                    else
                        buf:appendf("DockId=0x%08X,%d\n", settings.DockId, settings.DockOrder)
                    end
                    if settings.ClassId ~= 0 then buf:appendf("ClassId=0x%08X\n", settings.ClassId) end
                end
            end
            buf:append("\n")
        end
    end
end

function ImGui.WindowSettingsAddSettingsHandler()
    local ini_handler = ImGuiSettingsHandler()
    ini_handler.TypeName = "Window"
    ini_handler.TypeHash = ImHashStr("Window")
    ini_handler.ClearAllFn = WindowSettingsHandler_ClearAll
    ini_handler.ReadOpenFn = WindowSettingsHandler_ReadOpen
    ini_handler.ReadLineFn = WindowSettingsHandler_ReadLine
    ini_handler.ApplyAllFn = WindowSettingsHandler_ApplyAll
    ini_handler.WriteAllFn = WindowSettingsHandler_WriteAll
    ImGui.AddSettingsHandler(ini_handler)
end

---------------------------------------------------------------------------------------
-- [SECTION] LOGGING/CAPTURING
---------------------------------------------------------------------------------------

ImGuiLogFlags = ImGuiLogFlags or {
    None = 0, OutputTTY = 1, OutputFile = 2, OutputBuffer = 4, OutputClipboard = 8, OutputMask_ = 15,
}

local function LogTextV_Internal(g, fmt, ...)
    local s = (select("#", ...) > 0) and string.format(fmt, ...) or fmt
    if g.LogFile then
        print(s) -- TTY (the only "file" available on Roblox)
    else
        g.LogBuffer:append(s)
    end
end

function ImGui.LogText(fmt, ...)
    local g = GImGui
    if not g.LogEnabled then return end
    LogTextV_Internal(g, fmt, ...)
end
ImGui.LogTextV = ImGui.LogText

--- Internal version that takes a position to decide on newline placement and pad items according to their depth.
--- `text` is a Lua string, `text_begin/text_end` optional 1-based byte range (text_end exclusive).
function ImGui.LogRenderedText(ref_pos, text, text_end, text_begin)
    local g = GImGui
    local window = g.CurrentWindow

    local prefix, suffix = g.LogNextPrefix, g.LogNextSuffix
    g.LogNextPrefix = nil; g.LogNextSuffix = nil

    text_begin = text_begin or 1
    if not text_end then text_end = ImGui.FindRenderedTextEnd(text, text_end) end

    local log_new_line = ref_pos and (ref_pos.y > g.LogLinePosY + ImMax(g.Style.FramePadding.y, g.Style.ItemSpacing.y) + 1)
    if ref_pos then g.LogLinePosY = ref_pos.y end
    if log_new_line then
        ImGui.LogText("\n")
        g.LogLineFirstItem = true
    end

    if prefix then ImGui.LogRenderedText(ref_pos, prefix, #prefix + 1) end

    if g.LogDepthRef > window.DC.TreeDepth then g.LogDepthRef = window.DC.TreeDepth end
    local tree_depth = window.DC.TreeDepth - g.LogDepthRef

    local text_remaining = text_begin
    while true do
        local line_start = text_remaining
        local nl = string.find(text, "\n", line_start, true)
        local line_end = (nl and nl < text_end) and nl or text_end
        local is_last_line = (line_end == text_end)
        if line_start ~= line_end or not is_last_line then
            local indentation = g.LogLineFirstItem and tree_depth * 4 or 1
            ImGui.LogText(string.rep(" ", indentation) .. string.sub(text, line_start, line_end - 1))
            g.LogLineFirstItem = false
            if string.byte(text, line_end) == 10 then
                ImGui.LogText("\n")
                g.LogLineFirstItem = true
            end
        end
        if is_last_line then break end
        text_remaining = line_end + 1
    end

    if suffix then ImGui.LogRenderedText(ref_pos, suffix, #suffix + 1) end
end

function ImGui.LogBegin(flags, auto_open_depth)
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT(g.LogEnabled == false)
    g.LogEnabled = true; g.ItemUnclipByLog = true
    g.LogFlags = flags
    g.LogWindow = window
    g.LogNextPrefix = nil; g.LogNextSuffix = nil
    g.LogDepthRef = window.DC.TreeDepth
    g.LogDepthToExpand = ((auto_open_depth or -1) >= 0) and auto_open_depth or g.LogDepthToExpandDefault
    g.LogLinePosY = FLT_MAX
    g.LogLineFirstItem = true
    g.LogBuffer = ImGuiTextBuffer()
end

function ImGui.LogSetNextTextDecoration(prefix, suffix)
    local g = GImGui
    g.LogNextPrefix = prefix
    g.LogNextSuffix = suffix
end

function ImGui.LogToTTY(auto_open_depth)
    local g = GImGui
    if g.LogEnabled then return end
    ImGui.LogBegin(ImGuiLogFlags.OutputTTY, auto_open_depth or -1)
    g.LogFile = "stdout"
end

function ImGui.LogToFile(auto_open_depth, filename)
    -- Roblox: no file access. Falls back to TTY (output window).
    ImGui.LogToTTY(auto_open_depth)
end

function ImGui.LogToClipboard(auto_open_depth)
    local g = GImGui
    if g.LogEnabled then return end
    ImGui.LogBegin(ImGuiLogFlags.OutputClipboard, auto_open_depth or -1)
end

function ImGui.LogToBuffer(auto_open_depth)
    local g = GImGui
    if g.LogEnabled then return end
    ImGui.LogBegin(ImGuiLogFlags.OutputBuffer, auto_open_depth or -1)
end

function ImGui.LogFinish()
    local g = GImGui
    if not g.LogEnabled then return end
    ImGui.LogText("\n")
    local out = bit32.band(g.LogFlags, ImGuiLogFlags.OutputMask_)
    if out == ImGuiLogFlags.OutputClipboard then
        if not g.LogBuffer:empty() then ImGui.SetClipboardText(g.LogBuffer:c_str()) end
    end
    g.LogEnabled = false; g.ItemUnclipByLog = false
    g.LogFlags = ImGuiLogFlags.None
    g.LogFile = nil
    g.LogBuffer = ImGuiTextBuffer()
end

function ImGui.LogButtons()
    local g = GImGui
    ImGui.PushID("LogButtons")
    local log_to_tty = ImGui.Button("Log To TTY"); ImGui.SameLine()
    local log_to_file = ImGui.Button("Log To File"); ImGui.SameLine()
    local log_to_clipboard = ImGui.Button("Log To Clipboard"); ImGui.SameLine()
    ImGui.PushItemFlag(ImGuiItemFlags.NoTabStop, true)
    ImGui.SetNextItemWidth(ImGui.CalcTextSize("999").x)
    g.LogDepthToExpandDefault = ImGui.SliderInt("Default Depth", g.LogDepthToExpandDefault, 0, 9, nil)
    ImGui.PopItemFlag()
    ImGui.PopID()
    if log_to_tty then ImGui.LogToTTY() end
    if log_to_file then ImGui.LogToFile() end
    if log_to_clipboard then ImGui.LogToClipboard() end
end

--- @param window ImGuiWindow
--- @return ImGuiWindow?
local function GetWindowForTitleDisplay(window)
    if window.DockNodeAsHost then
        return window.DockNodeAsHost.VisibleWindow
    else
        return window
    end
end

--- @param id ImGuiID
function ImGui.KeepAliveID(id)
    local g = GImGui

    if g.ActiveId == id then
        g.ActiveIdIsAlive = id
    end

    if g.DeactivatedItemData.ID == id then
        g.DeactivatedItemData.IsAlive = true
    end
end

--- @param r_min  ImVec2
--- @param r_max  ImVec2
--- @param clip?  bool
function ImGui.IsMouseHoveringRect(r_min, r_max, clip)
    if clip == nil then clip = true end

    local g = GImGui

    local rect_clipped = ImRect(r_min, r_max)
    if clip then
        rect_clipped:ClipWith(g.CurrentWindow.ClipRect)
    end

    if not rect_clipped:ContainsWithPad(g.IO.MousePos, g.Style.TouchExtraPadding) then
        return false
    end
    if (not g.MouseViewport:GetMainRect():Overlaps(rect_clipped)) then
        return false
    end

    return true
end

-- Return if a mouse click/drag went past the given threshold. Valid to call during the MouseReleased frame.
-- [Internal] This doesn't test if the button is pressed
--- @param button          ImGuiMouseButton
--- @param lock_threshold? float
function ImGui.IsMouseDragPastThreshold(button, lock_threshold)
    if lock_threshold == nil then lock_threshold = -1.0 end

    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
    if lock_threshold < 0.0 then
        lock_threshold = g.IO.MouseDragThreshold
    end
    return g.IO.MouseDragMaxDistanceSqr[button] >= lock_threshold * lock_threshold
end

--- @param button          ImGuiMouseButton
--- @param lock_threshold? float
function ImGui.IsMouseDragging(button, lock_threshold)
    if lock_threshold == nil then lock_threshold = -1.0 end

    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
    if not g.IO.MouseDown[button] then
        return false
    end
    return ImGui.IsMouseDragPastThreshold(button, lock_threshold)
end

--- @param pos ImVec2
function ImGui.TeleportMousePos(pos)
    local g = GImGui
    ImVec2_Copy(g.IO.MousePos, pos)
    ImVec2_Copy(g.IO.MousePosPrev, pos)
    ImVec2_CopyV(g.IO.MouseDelta, 0.0, 0.0)
    g.IO.WantSetMousePos = true
    -- IMGUI_DEBUG_LOG_IO("TeleportMousePos: (%.1f,%.1f)", io.MousePos.x, io.MousePos.y)
end

--- @param id ImGuiID
function ImGui.ItemHandleShortcut(id)
    local g = GImGui
    local flags = g.NextItemData.ShortcutFlags
    IM_ASSERT(bit32.band(flags, bit32.bnot(ImGuiInputFlags.SupportedBySetNextItemShortcut)) == 0)

    if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.Disabled) ~= 0 then
        return
    end
    if bit32.band(flags, ImGuiInputFlags.Tooltip) ~= 0 then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasShortcut)
        g.LastItemData.Shortcut = g.NextItemData.Shortcut
    end
    if not ImGui.Shortcut(g.NextItemData.Shortcut, bit32.band(flags, ImGuiInputFlags.SupportedByShortcut), id) or g.NavActivateId ~= 0 then
        return
    end

    g.NavActivateId = id
    g.NavActivateFlags = bit32.bor(ImGuiActivateFlags.PreferInput, ImGuiActivateFlags.FromShortcut)
    g.NavActivateDownId = id
    g.NavActivatePressedId = id
    ImGui.NavHighlightActivated(id)
end

--- @param bb           ImRect
--- @param id           ImGuiID
--- @param nav_bb_arg?  ImRect
--- @param extra_flags? ImGuiItemFlags
function ImGui.ItemAdd(bb, id, nav_bb_arg, extra_flags)
    if extra_flags == nil then extra_flags = 0 end

    local g = GImGui
    local window = g.CurrentWindow

    g.LastItemData.ID = id
    ImRect_Copy(g.LastItemData.Rect, bb)
    ImRect_Copy(g.LastItemData.NavRect, nav_bb_arg and nav_bb_arg or bb)
    g.LastItemData.ItemFlags = bit32.bor(g.CurrentItemFlags, g.NextItemData.ItemFlagsSet, extra_flags)
    g.LastItemData.StatusFlags = ImGuiItemStatusFlags.None

    if id ~= 0 then
        ImGui.KeepAliveID(id)

        if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.NoNav) == 0 then
            window.DC.NavLayersActiveMaskNext = bit32.bor(window.DC.NavLayersActiveMaskNext, bit32.lshift(1, window.DC.NavLayerCurrent))

            if g.NavId == id or g.NavAnyRequest then
                if g.NavWindow.RootWindowForNav == window.RootWindowForNav then
                    if window == g.NavWindow or bit32.band(bit32.bor(window.ChildFlags, g.NavWindow.ChildFlags), ImGuiChildFlags.NavFlattened) ~= 0 then
                        ImGui.NavProcessItem()
                    end
                end
            end
        end

        if bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasShortcut) ~= 0 then
            ImGui.ItemHandleShortcut(id)
        end
    end

    g.NextItemData.HasFlags = ImGuiNextItemDataFlags.None
    g.NextItemData.ItemFlagsSet = ImGuiItemFlags.None

    local is_rect_visible = bb:Overlaps(window.ClipRect)
    if not is_rect_visible then
        if id == 0 or not (id == g.ActiveId or id == g.ActiveIdPreviousFrame or id == g.NavId or id == g.NavActivateId or g.ItemUnclipByLog) then
            return false
        end
    end

    if id ~= 0 and g.DeactivatedItemData.ID == id then
        g.DeactivatedItemData.ElapseFrame = g.FrameCount
    end

    if is_rect_visible then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Visible)
    end

    if ImGui.IsMouseHoveringRect(bb.Min, bb.Max) then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredRect)
    end

    return true
end

--- @param size_or_bb       ImVec2|ImRect
--- @param text_baseline_y? float
function ImGui.ItemSize(size_or_bb, text_baseline_y)
    if text_baseline_y == nil then text_baseline_y = -1.0 end

    local size
    if size_or_bb.Min then
        --- @cast size_or_bb ImRect
        size = size_or_bb:GetSize()
    else
        --- @cast size_or_bb ImVec2
        size = size_or_bb
    end

    local g = GImGui
    local window = g.CurrentWindow

    if window.SkipItems then
        return
    end

    local offset_to_match_baseline_y
    if text_baseline_y >= 0 then
        offset_to_match_baseline_y = ImMax(0, window.DC.CurrLineTextBaseOffset - text_baseline_y)
    else
        offset_to_match_baseline_y = 0
    end

    local line_y1
    if window.DC.IsSameLine then
        line_y1 = window.DC.CursorPosPrevLine.y
    else
        line_y1 = window.DC.CursorPos.y
    end

    local line_height = ImMax(window.DC.CurrLineSize.y, window.DC.CursorPos.y - line_y1 + size.y + offset_to_match_baseline_y)

    window.DC.CursorPosPrevLine.x = window.DC.CursorPos.x + size.x
    window.DC.CursorPosPrevLine.y = line_y1
    window.DC.CursorPos.x = IM_TRUNC(window.Pos.x + window.DC.Indent.x + window.DC.ColumnsOffset.x)
    window.DC.CursorPos.y = IM_TRUNC(line_y1 + line_height + g.Style.ItemSpacing.y)
    window.DC.CursorMaxPos.x = ImMax(window.DC.CursorMaxPos.x, window.DC.CursorPosPrevLine.x)
    window.DC.CursorMaxPos.y = ImMax(window.DC.CursorMaxPos.y, window.DC.CursorPos.y - g.Style.ItemSpacing.y)

    window.DC.PrevLineSize.y = line_height
    window.DC.CurrLineSize.y = 0
    window.DC.PrevLineTextBaseOffset = ImMax(window.DC.CurrLineTextBaseOffset, text_baseline_y)
    window.DC.CurrLineTextBaseOffset = 0
    window.DC.IsSetPos = false
    window.DC.IsSameLine = false

    --- Horizontal layout mode
    if (window.DC.LayoutType == ImGuiLayoutType.Horizontal) then
        ImGui.SameLine()
    end
end

--- @param offset_from_start_x float?
--- @param spacing_w           float?
function ImGui.SameLine(offset_from_start_x, spacing_w)
    if offset_from_start_x == nil then offset_from_start_x =  0.0 end
    if spacing_w           == nil then spacing_w           = -1.0 end

    local g = GImGui
    local window = g.CurrentWindow

    if window.SkipItems then
        return
    end

    if offset_from_start_x ~= 0.0 then
        if spacing_w < 0.0 then spacing_w = 0.0 end
        window.DC.CursorPos.x = window.Pos.x - window.Scroll.x + offset_from_start_x + spacing_w + window.DC.GroupOffset.x + window.DC.ColumnsOffset.x
        window.DC.CursorPos.y = window.DC.CursorPosPrevLine.y
    else
        if spacing_w < 0.0 then spacing_w = g.Style.ItemSpacing.x end
        window.DC.CursorPos.x = window.DC.CursorPosPrevLine.x + spacing_w
        window.DC.CursorPos.y = window.DC.CursorPosPrevLine.y
    end
    ImVec2_Copy(window.DC.CurrLineSize, window.DC.PrevLineSize)
    window.DC.CurrLineTextBaseOffset = window.DC.PrevLineTextBaseOffset
    window.DC.IsSameLine = true
end

--- @param indent_w? float
function ImGui.Indent(indent_w)
    if indent_w == nil then indent_w = 0.0 end

    local g = GImGui
    local window = ImGui.GetCurrentWindow()

    if indent_w ~= 0.0 then
        window.DC.Indent.x = window.DC.Indent.x + indent_w
    else
        window.DC.Indent.x = window.DC.Indent.x + g.Style.IndentSpacing
    end

    window.DC.CursorPos.x = window.Pos.x + window.DC.Indent.x + window.DC.ColumnsOffset.x
end

--- @param indent_w? float
function ImGui.Unindent(indent_w)
    if indent_w == nil then indent_w = 0.0 end

    local g = GImGui
    local window = ImGui.GetCurrentWindow()

    if indent_w ~= 0.0 then
        window.DC.Indent.x = window.DC.Indent.x - indent_w
    else
        window.DC.Indent.x = window.DC.Indent.x - g.Style.IndentSpacing
    end

    window.DC.CursorPos.x = window.Pos.x + window.DC.Indent.x + window.DC.ColumnsOffset.x
end

-- Affect large frame+labels widgets only
--- @param item_width float
function ImGui.SetNextItemWidth(item_width)
    local g = GImGui
    g.NextItemData.HasFlags = bit32.bor(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasWidth)
    g.NextItemData.Width = item_width
end

--- @param item_width float
function ImGui.PushItemWidth(item_width)
    local g = GImGui
    local window = g.CurrentWindow
    window.DC.ItemWidthStack:push_back(window.DC.ItemWidth)
    window.DC.ItemWidth = (item_width == 0.0) and window.DC.ItemWidthDefault or item_width
    g.NextItemData.HasFlags = bit32.band(g.NextItemData.HasFlags, bit32.bnot(ImGuiNextItemDataFlags.HasWidth))
end

function ImGui.PopItemWidth()
    local g = GImGui
    local window = g.CurrentWindow
    if window.DC.ItemWidthStack.Size <= 0 then
        IM_ASSERT_USER_ERROR(false, "Calling PopItemWidth() too many times!")
        return
    end
    window.DC.ItemWidth = window.DC.ItemWidthStack:back()
    window.DC.ItemWidthStack:pop_back()
end

--- @param components int
--- @param w_full     float
function ImGui.PushMultiItemsWidths(components, w_full)
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT(components > 0)
    local style = g.Style
    window.DC.ItemWidthStack:push_back(window.DC.ItemWidth)
    local w_items = w_full - style.ItemInnerSpacing.x * (components - 1)
    local prev_split = w_items
    for i = components - 1, 1, -1 do
        local next_split = IM_TRUNC(w_items * i / components)
        window.DC.ItemWidthStack:push_back(ImMax(prev_split - next_split, 1.0))
        prev_split = next_split
    end
    window.DC.ItemWidth = ImMax(prev_split, 1.0)
    g.NextItemData.HasFlags = bit32.band(g.NextItemData.HasFlags, bit32.bnot(ImGuiNextItemDataFlags.HasWidth))
end

--- @return float
function ImGui.GetFrameHeight()
    local g = GImGui
    return g.FontSize + g.Style.FramePadding.y * 2.0
end

--- @return ImVec2
--- @nodiscard
function ImGui.GetContentRegionAvail()
    local g = GImGui
    local window = g.CurrentWindow

    local mx
    if window.DC.CurrentColumns or g.CurrentTable then
        mx = window.WorkRect.Max
    else
        mx = window.ContentRegionRect.Max
    end

    return ImVec2(mx.x - window.DC.CursorPos.x, mx.y - window.DC.CursorPos.y)
end

--- @return ImVec2
--- @nodiscard
function ImGui.GetCursorScreenPos()
    local window = ImGui.GetCurrentWindowRead()
    local ret = ImVec2()
    ImVec2_Copy(ret, window.DC.CursorPos)
    return ret
end

--- @param pos ImVec2
function ImGui.SetCursorScreenPos(pos)
    local window = ImGui.GetCurrentWindow()
    ImVec2_Copy(window.DC.CursorPos, pos)
    window.DC.IsSetPos = true
end

-- [window-local] cursor position, in window coordinates (relative to window position, including scrolling)
--- @return ImVec2
function ImGui.GetCursorPos()
    local window = ImGui.GetCurrentWindowRead()
    return ImVec2(window.DC.CursorPos.x - window.Pos.x + window.Scroll.x, window.DC.CursorPos.y - window.Pos.y + window.Scroll.y)
end

function ImGui.GetCursorPosX()
    local window = ImGui.GetCurrentWindowRead()
    return window.DC.CursorPos.x - window.Pos.x + window.Scroll.x
end

function ImGui.GetCursorPosY()
    local window = ImGui.GetCurrentWindowRead()
    return window.DC.CursorPos.y - window.Pos.y + window.Scroll.y
end

--- @param local_pos ImVec2
function ImGui.SetCursorPos(local_pos)
    local window = ImGui.GetCurrentWindow()
    ImVec2_CopyV(window.DC.CursorPos, window.Pos.x - window.Scroll.x + local_pos.x, window.Pos.y - window.Scroll.y + local_pos.y)
    window.DC.IsSetPos = true
end

--- @param x float
function ImGui.SetCursorPosX(x)
    local window = ImGui.GetCurrentWindow()
    window.DC.CursorPos.x = window.Pos.x - window.Scroll.x + x
    window.DC.IsSetPos = true
end

--- @param y float
function ImGui.SetCursorPosY(y)
    local window = ImGui.GetCurrentWindow()
    window.DC.CursorPos.y = window.Pos.y - window.Scroll.y + y
    window.DC.IsSetPos = true
end

--- @return ImVec2
function ImGui.GetCursorStartPos()
    local window = ImGui.GetCurrentWindowRead()
    return window.DC.CursorStartPos - window.Pos
end

function ImGui.GetFrameHeightWithSpacing()
    local g = GImGui
    return g.FontSize + g.Style.FramePadding.y * 2.0 + g.Style.ItemSpacing.y
end

function ImGui.GetTextLineHeightWithSpacing()
    local g = GImGui
    return g.FontSize + g.Style.ItemSpacing.y
end

--- @return ImVec2
function ImGui.GetContentRegionMax()
    local window = GImGui.CurrentWindow
    return ImGui.GetContentRegionAvail() + window.DC.CursorPos - window.Pos
end

--- @return ImVec2
function ImGui.GetWindowContentRegionMin()
    local window = GImGui.CurrentWindow
    return window.ContentRegionRect.Min - window.Pos
end

--- @return ImVec2
function ImGui.GetWindowContentRegionMax()
    local window = GImGui.CurrentWindow
    return window.ContentRegionRect.Max - window.Pos
end

-- Overloads: IsRectVisible(size) / IsRectVisible(rect_min, rect_max)
function ImGui.IsRectVisible(a, b)
    local window = GImGui.CurrentWindow
    if b == nil then
        return window.ClipRect:Overlaps(ImRect(window.DC.CursorPos, window.DC.CursorPos + a))
    end
    return window.ClipRect:Overlaps(ImRect(a, b))
end

-- Lock horizontal starting position + capture group bounding box into one "item" (so you can use IsItemHovered() or layout primitives such as SameLine() on whole group, etc.)
-- Groups are currently a mishmash of functionalities which should perhaps be clarified and separated.
-- FIXME-OPT: Could we safely early out on ->SkipItems?
function ImGui.BeginGroup()
    local g = GImGui
    local window = g.CurrentWindow

    local group_data = ImGuiGroupData()
    group_data.WindowID = window.ID
    ImVec2_Copy(group_data.BackupCursorPos, window.DC.CursorPos)
    ImVec2_Copy(group_data.BackupCursorPosPrevLine, window.DC.CursorPosPrevLine)
    ImVec2_Copy(group_data.BackupCursorMaxPos, window.DC.CursorMaxPos)
    ImVec1_Copy(group_data.BackupIndent, window.DC.Indent)
    ImVec1_Copy(group_data.BackupGroupOffset, window.DC.GroupOffset)
    ImVec2_Copy(group_data.BackupCurrLineSize, window.DC.CurrLineSize)
    group_data.BackupCurrLineTextBaseOffset = window.DC.CurrLineTextBaseOffset
    group_data.BackupActiveIdIsAlive = g.ActiveIdIsAlive
    group_data.BackupHoveredIdIsAlive = (g.HoveredId ~= 0)
    group_data.BackupIsSameLine = window.DC.IsSameLine
    group_data.BackupAnyIdHasBeenEditedThisFrame = g.AnyIdHasBeenEditedThisFrame
    group_data.BackupDeactivatedIdIsAlive = g.DeactivatedItemData.IsAlive
    group_data.EmitItem = true

    g.GroupStack:push_back(group_data)

    window.DC.GroupOffset.x = window.DC.CursorPos.x - window.Pos.x - window.DC.ColumnsOffset.x
    ImVec1_Copy(window.DC.Indent, window.DC.GroupOffset)
    ImVec2_Copy(window.DC.CursorMaxPos, window.DC.CursorPos)
    ImVec2_CopyV(window.DC.CurrLineSize, 0.0, 0.0)
    if (g.LogEnabled) then
        g.LogLinePosY = -FLT_MAX
    end
end

function ImGui.EndGroup()
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT(g.GroupStack.Size > 0) -- Mismatched BeginGroup()/EndGroup() calls

    local group_data = g.GroupStack:back()
    IM_ASSERT(group_data.WindowID == window.ID) -- EndGroup() in wrong window?

    if (window.DC.IsSetPos) then
        -- TODO: ImGui.ErrorCheckUsingSetCursorPosToExtendParentBoundaries()
    end

    local group_bb = ImRect(group_data.BackupCursorPos, ImMax(ImMax(window.DC.CursorMaxPos, g.LastItemData.Rect.Max), group_data.BackupCursorPos))
    ImVec2_Copy(window.DC.CursorPos, group_data.BackupCursorPos)
    ImVec2_Copy(window.DC.CursorPosPrevLine, group_data.BackupCursorPosPrevLine)
    ImVec2_Copy(window.DC.CursorMaxPos, ImMax(group_data.BackupCursorMaxPos, group_bb.Max))
    ImVec1_Copy(window.DC.Indent, group_data.BackupIndent)
    ImVec1_Copy(window.DC.GroupOffset, group_data.BackupGroupOffset)
    ImVec2_Copy(window.DC.CurrLineSize, group_data.BackupCurrLineSize)
    window.DC.CurrLineTextBaseOffset = group_data.BackupCurrLineTextBaseOffset
    window.DC.IsSameLine = group_data.BackupIsSameLine
    if (g.LogEnabled) then
        g.LogLinePosY = -FLT_MAX -- To enforce a carriage return
    end

    if (not group_data.EmitItem) then
        g.GroupStack:pop_back()
        return
    end

    window.DC.CurrLineTextBaseOffset = ImMax(window.DC.PrevLineTextBaseOffset, group_data.BackupCurrLineTextBaseOffset) -- FIXME: Incorrect, we should grab the base offset from the *first line* of the group but it is hard to obtain now
    ImGui.ItemSize(group_bb:GetSize())
    ImGui.ItemAdd(group_bb, 0, nil, ImGuiItemFlags.NoTabStop)

    -- If the current ActiveId was declared within the boundary of our group, we copy it to LastItemId so IsItemActive(), IsItemDeactivated() etc. will be functional on the entire group.
    -- It would be neater if we replaced window.DC.LastItemId by e.g. 'bool LastItemIsActive', but would put a little more burden on individual widgets.
    -- Also if you grep for LastItemId you'll notice it is only used in that context.
    -- (The two tests not the same because ActiveIdIsAlive is an ID itself, in order to be able to handle ActiveId being overwritten during the frame.)
    local group_contains_curr_active_id = (group_data.BackupActiveIdIsAlive ~= g.ActiveId) and (g.ActiveIdIsAlive == g.ActiveId) and g.ActiveId
    local group_contains_deactivated_id = (group_data.BackupDeactivatedIdIsAlive == false) and (g.DeactivatedItemData.IsAlive == true)
    if group_contains_curr_active_id then
        g.LastItemData.ID = g.ActiveId
    elseif group_contains_deactivated_id then
        g.LastItemData.ID = g.DeactivatedItemData.ID
    end
    ImRect_Copy(g.LastItemData.Rect, group_bb)

    -- Forward Hovered flag
    local group_contains_curr_hovered_id = (group_data.BackupHoveredIdIsAlive == false) and g.HoveredId ~= 0
    if group_contains_curr_hovered_id then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredWindow)
    end

    -- Forward Edited flag
    if g.AnyIdHasBeenEditedThisFrame and not group_data.BackupAnyIdHasBeenEditedThisFrame then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Edited)
    end

    -- Forward Deactivated flag
    g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasDeactivated)
    if group_contains_deactivated_id then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Deactivated)
    end

    g.GroupStack:pop_back()
    if g.DebugShowGroupRects then
        window.DrawList:AddRect(group_bb.Min, group_bb.Max, IM_COL32(255, 0, 255, 255)) -- [Debug]
    end
end

function ImGui.CalcItemWidth()
    local g = GImGui
    local window = g.CurrentWindow

    local w
    if bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasWidth) ~= 0 then
        w = g.NextItemData.Width
    else
        w = window.DC.ItemWidth
    end

    if w < 0.0 then
        local region_avail_x = ImGui.GetContentRegionAvail().x
        w = ImMax(1.0, region_avail_x + w)
    end

    w = IM_TRUNC(w)
    return w
end

--- @param size      ImVec2
--- @param default_w float
--- @param default_h float
--- @return ImVec2
function ImGui.CalcItemSize(size, default_w, default_h)
    local avail
    if size.x < 0.0 or size.y < 0.0 then
        avail = ImGui.GetContentRegionAvail()
    end

    if size.x == 0.0 then
        size.x = default_w
    elseif size.x < 0.0 then
        size.x = ImMax(4.0, avail.x + size.x)  -- size.x is negative here so we are subtracting
    end

    if size.y == 0.0 then
        size.y = default_h
    elseif size.y < 0.0 then
        size.y = ImMax(4.0, avail.y + size.y)  -- size.y is negative here so we are subtracting
    end

    return size
end

function ImGui.GetTextLineHeight()
    local g = GImGui
    return g.FontSize
end

function ImGui.IsItemActive()
    local g = GImGui

    if g.ActiveId ~= 0 then
        return g.ActiveId == g.LastItemData.ID
    end

    return false
end

function ImGui.IsItemFocused()
    local g = GImGui
    if g.NavId ~= g.LastItemData.ID or g.NavId == 0 then
        return false
    end

    local window = g.CurrentWindow
    if g.LastItemData.ID == window.ID and window.WriteAccessed then
        return false
    end

    return true
end

function ImGui.IsItemDeactivated()
    local g = GImGui
    if bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasDeactivated) ~= 0 then
        return bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Deactivated) ~= 0
    end
    return g.DeactivatedItemData.ID == g.LastItemData.ID and g.LastItemData.ID ~= 0 and g.DeactivatedItemData.ElapseFrame >= g.FrameCount
end

function ImGui.IsItemDeactivatedAfterEdit()
    local g = GImGui
    return ImGui.IsItemDeactivated() and g.DeactivatedItemData.HasBeenEditedBefore
end

function ImGui.IsItemActivated()
    local g = GImGui
    if g.ActiveId ~= 0 then
        if g.ActiveId == g.LastItemData.ID and g.ActiveIdPreviousFrame ~= g.LastItemData.ID then
            return true
        end
    end
    return false
end

-- Important: this can be useful but it is NOT equivalent to the behavior of e.g.Button()!
--- @param mouse_button? ImGuiMouseButton
function ImGui.IsItemClicked(mouse_button)
    if mouse_button == nil then mouse_button = 0 end
    return ImGui.IsMouseClicked(mouse_button) and ImGui.IsItemHovered(ImGuiHoveredFlags.None)
end

function ImGui.IsItemToggledOpen()
    return bit32.band(GImGui.LastItemData.StatusFlags, ImGuiItemStatusFlags.ToggledOpen) ~= 0
end

function ImGui.IsItemToggledSelection()
    local g = GImGui
    IM_ASSERT(g.CurrentMultiSelect ~= nil) -- Can only be used inside a BeginMultiSelect()/EndMultiSelect()
    return bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.ToggledSelection) ~= 0
end

function ImGui.IsAnyItemHovered()
    local g = GImGui
    return g.HoveredId ~= 0 or g.HoveredIdPreviousFrame ~= 0
end

function ImGui.IsAnyItemActive()
    return GImGui.ActiveId ~= 0
end

function ImGui.IsAnyItemFocused()
    local g = GImGui
    return g.NavId ~= 0 and g.NavCursorVisible
end

function ImGui.IsItemVisible()
    return bit32.band(GImGui.LastItemData.StatusFlags, ImGuiItemStatusFlags.Visible) ~= 0
end

function ImGui.IsItemEdited()
    return bit32.band(GImGui.LastItemData.StatusFlags, ImGuiItemStatusFlags.Edited) ~= 0
end

-- Allow next item to be overlapped by subsequent items.
function ImGui.SetNextItemAllowOverlap()
    local g = GImGui
    g.NextItemData.ItemFlagsSet = bit32.bor(g.NextItemData.ItemFlagsSet, ImGuiItemFlags.AllowOverlap)
end

function ImGui.GetItemID()
    return GImGui.LastItemData.ID
end

function ImGui.GetItemFlags()
    return GImGui.LastItemData.ItemFlags
end

--- @return ImVec2
function ImGui.GetItemRectSize()
    return GImGui.LastItemData.Rect:GetSize()
end

function ImGui.GetHoveredID()
    local g = GImGui
    return (g.HoveredId ~= 0) and g.HoveredId or g.HoveredIdPreviousFrame
end

---------------------------------------------------------------------------------------
-- [SECTION] WINDOW FOCUS
---------------------------------------------------------------------------------------

--- @param window? ImGuiWindow
--- @param flags?  ImGuiFocusRequestFlags
function ImGui.FocusWindow(window, flags)
    if flags == nil then flags = 0 end

    local g = GImGui

    if bit32.band(flags, ImGuiFocusRequestFlags.UnlessBelowModal) ~= 0 and g.NavWindow ~= window then
        local blocking_modal = ImGui.FindBlockingModal(window)
        if blocking_modal then
            -- IMGUI_DEBUG_LOG_FOCUS("[focus] FocusWindow(\"%s\", UnlessBelowModal): prevented by \"%s\".", window ? window->Name : "<NULL>", blocking_modal->Name)
            if window and window == window.RootWindow and bit32.band(window.Flags, ImGuiWindowFlags.NoBringToFrontOnFocus) == 0 then
                ImGui.BringWindowToDisplayBehind(window, blocking_modal)
            end
            ImGui.ClosePopupsOverWindow(ImGui.GetTopMostPopupModal(), false)
            return
        end
    end

    if bit32.band(flags, ImGuiFocusRequestFlags.RestoreFocusedChild) ~= 0 and window ~= nil then
        window = ImGui.NavRestoreLastChildNavWindow(window)
    end

    if g.NavWindow ~= window then
        ImGui.SetNavWindow(window)
        if window and g.NavHighlightItemUnderNav then
            g.NavMousePosDirty = true
        end
        g.NavId = window and window.NavLastIds[0] or 0
        g.NavLayer = ImGuiNavLayer.Main
        ImGui.SetNavFocusScope(window and window.NavRootFocusScopeId or 0)
        g.NavIdIsAlive = false
        g.NavLastValidSelectionUserData = ImGuiSelectionUserData_Invalid

        -- Close popups if any
        ImGui.ClosePopupsOverWindow(window, false)
    end

    IM_ASSERT(window == nil or window.RootWindowDockTree ~= nil)
    local focus_front_window = window and window.RootWindow or nil
    local display_front_window = window and window.RootWindowDockTree or nil
    local dock_node = window and window.DockNode or nil
    local active_id_window_is_dock_node_host = g.ActiveIdWindow and dock_node and dock_node.HostWindow == g.ActiveIdWindow

    if g.ActiveId ~= 0 and g.ActiveIdWindow and g.ActiveIdWindow.RootWindow ~= focus_front_window then
        if not g.ActiveIdNoClearOnFocusLoss and not active_id_window_is_dock_node_host then
            ImGui.ClearActiveID()
        end
    end

    if not window then
        return
    end
    window.LastFrameJustFocused = g.FrameCount

    ImGui.BringWindowToFocusFront(focus_front_window)
    if bit32.band(bit32.bor(window.Flags, focus_front_window.Flags, display_front_window.Flags), ImGuiWindowFlags.NoBringToFrontOnFocus) == 0 then
        ImGui.BringWindowToDisplayFront(display_front_window)
    end
end

--- @param window ImGuiWindow
--- @return int
function ImGui.FindWindowFocusIndex(window)
    local g = GImGui
    -- IM_UNUSED(g)
    local order = window.FocusOrder
    IM_ASSERT(window.RootWindow == window) -- No child window (not testing _ChildWindow because of docking)
    IM_ASSERT(g.WindowsFocusOrder.Data[order] == window)
    return order
end

--- @param window ImGuiWindow
--- @return bool
function ImGui.IsWindowNavFocusable(window)
    return window.WasActive and window == window.RootWindow and bit32.band(window.Flags, ImGuiWindowFlags.NoNavFocus) == 0
end

--- @param i_start int
--- @param i_stop  int
--- @param dir     int
--- @return ImGuiWindow?
function ImGui.FindWindowNavFocusable(i_start, i_stop, dir)
    local g = GImGui
    local i = i_start
    while i >= 1 and i <= g.WindowsFocusOrder.Size and i ~= i_stop do
        local window = g.WindowsFocusOrder.Data[i]
        if ImGui.IsWindowNavFocusable(window) then
            return window
        end
        i = i + dir
    end
    return nil
end

function ImGui.UpdateWindowInFocusOrderList(window, just_created, new_flags)
    local g = GImGui

    local new_is_explicit_child = (bit32.band(new_flags, ImGuiWindowFlags.ChildWindow) ~= 0) and ((bit32.band(new_flags, ImGuiWindowFlags.Popup) == 0) or (bit32.band(new_flags, ImGuiWindowFlags.ChildMenu) ~= 0))
    local child_flag_changed = (new_is_explicit_child ~= window.IsExplicitChild)

    if (just_created or child_flag_changed) and not new_is_explicit_child then
        IM_ASSERT(not g.WindowsFocusOrder:contains(window))
        g.WindowsFocusOrder:push_back(window)
        window.FocusOrder = g.WindowsFocusOrder.Size
    elseif not just_created and child_flag_changed and new_is_explicit_child then
        IM_ASSERT(g.WindowsFocusOrder.Data[window.FocusOrder] == window)

        for n = window.FocusOrder + 1, g.WindowsFocusOrder.Size do
            g.WindowsFocusOrder.Data[n].FocusOrder = g.WindowsFocusOrder.Data[n].FocusOrder - 1
        end

        g.WindowsFocusOrder:erase(window.FocusOrder)
        window.FocusOrder = -1
    end

    window.IsExplicitChild = new_is_explicit_child
end

--- @param window? ImGuiWindow
function ImGui.BringWindowToFocusFront(window)
    local g = GImGui
    IM_ASSERT(window == window.RootWindow)

    local cur_order = window.FocusOrder
    IM_ASSERT(g.WindowsFocusOrder.Data[cur_order] == window)

    if g.WindowsFocusOrder:back() == window then
        return
    end

    local new_order = g.WindowsFocusOrder.Size

    for n = cur_order, new_order - 1 do
        g.WindowsFocusOrder.Data[n] = g.WindowsFocusOrder.Data[n + 1]
        g.WindowsFocusOrder.Data[n].FocusOrder = g.WindowsFocusOrder.Data[n].FocusOrder - 1
        IM_ASSERT(g.WindowsFocusOrder.Data[n].FocusOrder == n)
    end

    g.WindowsFocusOrder.Data[new_order] = window
    window.FocusOrder = new_order
end

--- @param window? ImGuiWindow
function ImGui.BringWindowToDisplayFront(window)
    local g = GImGui

    local current_front_window = g.Windows:back()

    if current_front_window == window or current_front_window.RootWindowDockTree == window then
        return
    end

    for i, this_window in g.Windows:iter() do
        if this_window == window then
            g.Windows:erase(i)
            break
        end
    end

    g.Windows:push_back(window)
end

--- @param window        ImGuiWindow
--- @param behind_window ImGuiWindow
function ImGui.BringWindowToDisplayBehind(window, behind_window)
    IM_ASSERT(window ~= nil and behind_window ~= nil)
    local g = GImGui
    window = window.RootWindow
    behind_window = behind_window.RootWindow
    -- TODO:
end

--- @param under_this_window? ImGuiWindow
--- @param ignore_window?     ImGuiWindow
--- @param filter_viewport?   ImGuiViewport
--- @param flags              ImGuiFocusRequestFlags
function ImGui.FocusTopMostWindowUnderOne(under_this_window, ignore_window, filter_viewport, flags)
    local g = GImGui
    local start_idx = g.WindowsFocusOrder.Size
    if under_this_window ~= nil then
        -- Aim at root window behind us, if we are in a child window that's our own root (see #4640)
        local offset = -1
        while bit32.band(under_this_window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 do
            under_this_window = under_this_window.ParentWindow
            offset = 0
        end
        --- @cast under_this_window ImGuiWindow
        start_idx = ImGui.FindWindowFocusIndex(under_this_window) + offset
    end
    for i = start_idx, 1, -1 do
        repeat
        local window = g.WindowsFocusOrder.Data[i]
        if window == ignore_window or not window.WasActive then
            break
        end
        if filter_viewport ~= nil and window.Viewport ~= filter_viewport then
            break
        end
        if bit32.band(window.Flags, bit32.bor(ImGuiWindowFlags.NoMouseInputs, ImGuiWindowFlags.NoNavInputs)) ~= bit32.bor(ImGuiWindowFlags.NoMouseInputs, ImGuiWindowFlags.NoNavInputs) then
            ImGui.FocusWindow(window, flags)
            return
        end

        until true
    end
    ImGui.FocusWindow(nil, flags)
end

--- @param id     ImGuiID
--- @param window ImGuiWindow
function ImGui.SetFocusID(id, window)
    local g = GImGui
    IM_ASSERT(id ~= 0)

    if g.NavWindow ~= window then
        ImGui.SetNavWindow(window)
    end

    local nav_layer = window.DC.NavLayerCurrent
    g.NavId = id
    g.NavLayer = nav_layer
    ImGui.SetNavFocusScope(g.CurrentFocusScopeId)
    window.NavLastIds[nav_layer] = id
    if g.LastItemData.ID == id then
        ImRect_Copy(window.NavRectRel[nav_layer], ImGui.WindowRectAbsToRel(window, g.LastItemData.NavRect))
    end
    g.NavIdItemFlags = (g.LastItemData.ID == id) and g.LastItemData.ItemFlags or ImGuiItemFlags.None
    if id == g.ActiveIdIsAlive then
        g.NavIdIsAlive = true
    end

    if g.ActiveIdSource == ImGuiInputSource.Keyboard or g.ActiveIdSource == ImGuiInputSource.Gamepad then
        g.NavHighlightItemUnderNav = true
    elseif g.IO.ConfigNavCursorVisibleAuto then
        g.NavCursorVisible = false
    end

    ImGui.NavClearPreferredPosForAxis(ImGuiAxis.X)
    ImGui.NavClearPreferredPosForAxis(ImGuiAxis.Y)
end

function ImGui.StopMouseMovingWindow()
    local g = GImGui
    local window = g.MovingWindow

    if window and window.Viewport then
        if bit32.band(g.ConfigFlagsCurrFrame, ImGuiConfigFlags.ViewportsEnable) ~= 0 then
            ImGui.UpdateTryMergeWindowIntoHostViewport(window.RootWindowDockTree, g.MouseViewport)
        end

        if (not ImGui.IsDragDropPayloadBeingAccepted()) then
            g.MouseViewport = window.Viewport
        end

        local window_can_use_inputs = bit32.band(window.Flags, ImGuiWindowFlags.NoMouseInputs) == 0 or bit32.band(window.Flags, ImGuiWindowFlags.NoNavInputs) == 0
        if window_can_use_inputs then
            window.Viewport.Flags = bit32.band(window.Viewport.Flags, bit32.bnot(ImGuiViewportFlags.NoInputs))
        end
    end

    g.MovingWindow = nil
end

--- @param id      ImGuiID
--- @param window? ImGuiWindow
function ImGui.SetActiveID(id, window)
    local g = GImGui

    if g.ActiveId ~= 0 then
        local deactivated_data = g.DeactivatedItemData
        deactivated_data.ID = g.ActiveId
        deactivated_data.ElapseFrame = (g.LastItemData.ID == g.ActiveId) and g.FrameCount or g.FrameCount + 1 -- FIXME: OK to use LastItemData?
        deactivated_data.HasBeenEditedBefore = g.ActiveIdHasBeenEditedBefore
        deactivated_data.IsAlive = (g.ActiveIdIsAlive == g.ActiveId)

        if g.InputTextState.ID == g.ActiveId then
            ImGui.InputTextDeactivateHook(g.ActiveId)
        end

        if g.MovingWindow and (g.ActiveId == g.MovingWindow.MoveId) then
            print("SetActiveID() cancel MovingWindow")
            ImGui.StopMouseMovingWindow()
        end
    end

    g.ActiveIdIsJustActivated = (g.ActiveId ~= id)
    if (g.ActiveIdIsJustActivated) then
        -- IMGUI_DEBUG_LOG_ACTIVEID("SetActiveID() 0x%08X in \"%s\"%*s(previously 0x%08X in \"%s\")\n", id, window ? window->Name : "",
        --     ImMax(0, 20 - (int)(window ? strlen(window->Name) : 0)), "", g.ActiveId, g.ActiveIdWindow ? g.ActiveIdWindow->Name : "");
        g.ActiveIdTimer = 0.0
        g.ActiveIdHasBeenPressedBefore = false
        g.ActiveIdHasBeenEditedBefore = false
        g.ActiveIdMouseButton = -1

        if id ~= 0 then
            g.LastActiveId = id
            g.LastActiveIdTimer = 0.0
        end
    end
    g.ActiveId = id
    g.ActiveIdAllowOverlap = false
    g.ActiveIdNoClearOnFocusLoss = false
    g.ActiveIdWindow = window
    g.ActiveIdHasBeenEditedThisFrame = false
    g.ActiveIdFromShortcut = false
    g.ActiveIdDisabledId = 0
    if id ~= 0 then
        g.ActiveIdIsAlive = id
        if g.NavActivateId == id or g.NavJustMovedToId == id then
            g.ActiveIdSource = g.NavInputSource
        else
            g.ActiveIdSource = ImGuiInputSource.Mouse
        end
        IM_ASSERT(g.ActiveIdSource ~= ImGuiInputSource.None)
    end

    g.ActiveIdUsingNavDirMask = 0x00
    g.ActiveIdUsingAllKeyboardKeys = false
end

function ImGui.ClearActiveID()
    ImGui.SetActiveID(0, nil)
end

--- @param str_id string|int
function ImGui.PushID(str_id)
    local g = GImGui
    local window = g.CurrentWindow
    local id = window:GetID(str_id)
    window.IDStack:push_back(id)
end

--- @param id ImGuiID
function ImGui.PushOverrideID(id)
    local g = GImGui
    local window = g.CurrentWindow
    -- TODO: DebugHookIdInfo()
    window.IDStack:push_back(id)
end

function ImGui.PopID()
    local window = GImGui.CurrentWindow
    IM_ASSERT_USER_ERROR_RET(window.IDStack.Size > 1, "Calling PopID() too many times!")
    window.IDStack:pop_back()
end

--- @param id string|int
--- @return ImGuiID
function MT.ImGuiWindow:GetID(id)
    local seed = self.IDStack:back()

    if type(id) == "string" then
        return ImHashStr(id, nil, seed)
    else --- @cast id int
        return ImHashData(id, -1, seed)
    end
end

-- This is only used in rare/specific situations to manufacture an ID out of nowhere
-- FIXME: Consider instead storing last non-zero ID + count of successive zero-ID, and combine those?
--- @param p_abs ImVec2
--- @return ImGuiID
function MT.ImGuiWindow:GetIDFromPos(p_abs)
    local seed = self.IDStack:back()
    local p_rel = ImGui.WindowPosAbsToRel(self, p_abs)
    return ImHashData(p_rel, 2, seed)
end

-- "
--- @param r_abs ImRect
--- @return ImGuiID
function MT.ImGuiWindow:GetIDFromRectangle(r_abs)
    local seed = self.IDStack:back()
    local r_rel = ImGui.WindowRectAbsToRel(self, r_abs)
    return ImHashData({ math.floor(r_rel.Min.x), math.floor(r_rel.Min.y), math.floor(r_rel.Max.x), math.floor(r_rel.Max.y) }, 4, seed)
end

-- Overloads: GetID(str_id) / GetID(str_id_begin, str_id_end) / GetID(int_id)
--- @param str_or_int string|int
--- @param str_end?   int # exclusive end (1-based byte position)
--- @return ImGuiID
function ImGui.GetID(str_or_int, str_end)
    local window = GImGui.CurrentWindow
    if str_end ~= nil and type(str_or_int) == "string" then
        return ImHashStr(str_or_int, str_end - 1, window.IDStack:back())
    end
    return window:GetID(str_or_int)
end

-- Overloads: GetIDWithSeed(str, str_end, seed) / GetIDWithSeed(n, seed)
function ImGui.GetIDWithSeed(a, b, c)
    if type(a) == "number" then
        return ImHashData(a, -1, b)
    end
    return ImHashStr(a, b and (b - 1) or nil, c)
end

--- @param id ImGuiID
function ImGui.SetHoveredID(id)
    local g = GImGui
    g.HoveredId = id
    g.HoveredIdAllowOverlap = false
    if id ~= 0 and g.HoveredIdPreviousFrame ~= id then
        g.HoveredIdTimer = 0.0
        g.HoveredIdNotActiveTimer = 0.0
    end
end

--- @param flags ImGuiHoveredFlags
--- @return float
local function CalcDelayFromHoveredFlags(flags)
    local g = GImGui
    if bit32.band(flags, ImGuiHoveredFlags.DelayNormal) ~= 0 then
        return g.Style.HoverDelayNormal
    end
    if bit32.band(flags, ImGuiHoveredFlags.DelayShort) ~= 0 then
        return g.Style.HoverDelayShort
    end
    return 0.0
end

--- @param user_flags   ImGuiHoveredFlags
--- @param shared_flags ImGuiHoveredFlags
local function ApplyHoverFlagsForTooltip(user_flags, shared_flags)
    if bit32.band(user_flags, bit32.bor(ImGuiHoveredFlags.DelayNone, ImGuiHoveredFlags.DelayShort, ImGuiHoveredFlags.DelayNormal)) ~= 0 then
        shared_flags = bit32.band(shared_flags, bit32.bnot(bit32.bor(ImGuiHoveredFlags.DelayNone, ImGuiHoveredFlags.DelayShort, ImGuiHoveredFlags.DelayNormal)))
    end
    return bit32.bor(user_flags, shared_flags)
end

--- @param id ImGuiID
function ImGui.MarkItemEdited(id)
    -- This marking is to be able to provide info for IsItemDeactivatedAfterEdit().
    -- ActiveId might have been released by the time we call this (as in the typical press/release button behavior) but still need to fill the data.
    local g = GImGui

    g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.EditedInternal)
    if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.NoMarkEdited) ~= 0 then
        return
    end
    g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Edited)

    if g.ActiveId == id or g.ActiveId == 0 then
        -- FIXME: Can't we fully rely on LastItemData yet?
        g.AnyIdHasBeenEditedThisFrame = true
        g.ActiveIdHasBeenEditedThisFrame = true
        g.ActiveIdHasBeenEditedBefore = true
    end
    if g.DeactivatedItemData.ID == id then
        g.DeactivatedItemData.HasBeenEditedBefore = true
    end

    -- We accept a MarkItemEdited() on drag and drop targets (see https://github.com/ocornut/imgui/issues/1875#issuecomment-978243343)
    -- We accept 'ActiveIdPreviousFrame == id' for InputText() returning an edit after it has been taken ActiveId away (#4714)
    -- FIXME: This assert is getting a bit meaningless over time. It helped detect some unusual use cases but eventually it is becoming an unnecessary restriction.
    IM_ASSERT(g.DragDropActive or g.ActiveId == id or g.ActiveId == 0 or g.DeactivatedItemData.ID == id or g.ActiveIdPreviousFrame == id or g.NavJustMovedToId or (g.CurrentMultiSelect ~= nil and g.BoxSelectState.IsActive))

    -- IM_ASSERT(g.CurrentWindow.DC.LastItemId == id)
    g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Edited)
end

--- @param window ImGuiWindow
--- @param flags  ImGuiHoveredFlags
function ImGui.IsWindowContentHoverable(window, flags)
    -- An active popup disable hovering on other windows (apart from its own children)
    -- FIXME-OPT: This could be cached/stored within the window.
    local g = GImGui
    if g.NavWindow then
        local focused_root_window = g.NavWindow.RootWindowDockTree
        if focused_root_window.WasActive and focused_root_window ~= window.RootWindowDockTree then
            -- For the purpose of those flags we differentiate "standard popup" from "modal popup"
            -- NB: The 'else' is important because Modal windows are also Popups.
            local want_inhibit = false
            if bit32.band(focused_root_window.Flags, ImGuiWindowFlags.Modal) ~= 0 then
                want_inhibit = true
            elseif (bit32.band(focused_root_window.Flags, ImGuiWindowFlags.Popup) ~= 0) and (bit32.band(flags, ImGuiHoveredFlags.AllowWhenBlockedByPopup) == 0) then
                want_inhibit = true
            end

            -- Inhibit hover unless the window is within the stack of our modal/popup
            if want_inhibit then
                if not ImGui.IsWindowWithinBeginStackOf(window.RootWindow, focused_root_window) then
                    return false
                end
            end
        end
    end

    -- Filter by viewport
    if (window.Viewport ~= g.MouseViewport) then
        if (g.MovingWindow == nil or window.RootWindowDockTree ~= g.MovingWindow.RootWindowDockTree) then
            return false
        end
    end

    return true
end

--- @param flags? ImGuiHoveredFlags
function ImGui.IsItemHovered(flags)
    if flags == nil then flags = 0 end

    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT_USER_ERROR(bit32.band(flags, bit32.bnot(ImGuiHoveredFlags.AllowedMaskForIsItemHovered)) == 0, "Invalid flags for IsItemHovered()!")

    if g.NavHighlightItemUnderNav and g.NavCursorVisible and bit32.band(flags, ImGuiHoveredFlags.NoNavOverride) == 0 then
        if not ImGui.IsItemFocused() then
            return false
        end
        if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.Disabled) ~= 0 and bit32.band(flags, ImGuiHoveredFlags.AllowWhenDisabled) == 0 then
            return false
        end

        if bit32.band(flags, ImGuiHoveredFlags.ForTooltip) ~= 0 then
            flags = ApplyHoverFlagsForTooltip(flags, g.Style.HoverFlagsForTooltipNav)
        end
    else
        local status_flags = g.LastItemData.StatusFlags
        if bit32.band(status_flags, ImGuiItemStatusFlags.HoveredRect) == 0 then
            return false
        end

        if bit32.band(flags, ImGuiHoveredFlags.ForTooltip) ~= 0 then
            flags = ApplyHoverFlagsForTooltip(flags, g.Style.HoverFlagsForTooltipMouse)
        end

        if g.HoveredWindow ~= window and bit32.band(status_flags, ImGuiItemStatusFlags.HoveredWindow) == 0 then
            if bit32.band(flags, ImGuiHoveredFlags.AllowWhenOverlappedByWindow) == 0 then
                return false
            end
        end

        local id = g.LastItemData.ID
        if bit32.band(flags, ImGuiHoveredFlags.AllowWhenBlockedByActiveItem) == 0 then
            if g.ActiveId ~= 0 and g.ActiveId ~= id and not g.ActiveIdAllowOverlap and not g.ActiveIdFromShortcut then
                local cancel_is_hovered = true
                if g.ActiveId == window.MoveId and (id == 0 or g.ActiveIdDisabledId == id) then
                    cancel_is_hovered = false
                end
                if g.ActiveId == window.TabId then
                    cancel_is_hovered = false
                end
                if cancel_is_hovered then
                    return false
                end
            end
        end

        if not ImGui.IsWindowContentHoverable(window, flags) and bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.NoWindowHoverableCheck) == 0 then
            return false
        end

        if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.Disabled) ~= 0 and bit32.band(flags, ImGuiHoveredFlags.AllowWhenDisabled) == 0 then
            return false
        end

        if id == window.MoveId and window.WriteAccessed then
            return false
        end

        if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.AllowOverlap) ~= 0 and id ~= 0 then
            if bit32.band(flags, ImGuiHoveredFlags.AllowWhenOverlappedByItem) == 0 then
                if g.HoveredIdPreviousFrame ~= g.LastItemData.ID then
                    return false
                end
            end
        end
    end

    local delay = CalcDelayFromHoveredFlags(flags)
    if delay > 0.0 or bit32.band(flags, ImGuiHoveredFlags.Stationary) ~= 0 then
        local hover_delay_id
        if g.LastItemData.ID ~= 0 then
            hover_delay_id = g.LastItemData.ID
        else
            hover_delay_id = window:GetIDFromPos(g.LastItemData.Rect.Min)
        end
        if bit32.band(flags, ImGuiHoveredFlags.NoSharedDelay) ~= 0 and g.HoverItemDelayIdPreviousFrame ~= hover_delay_id then
            g.HoverItemDelayTimer = 0.0
        end
        g.HoverItemDelayId = hover_delay_id

        if bit32.band(flags, ImGuiHoveredFlags.Stationary) ~= 0 and g.HoverItemUnlockedStationaryId ~= hover_delay_id then
            return false
        end

        if g.HoverItemDelayTimer < delay then
            return false
        end
    end

    return true
end

--- @param bb         ImRect
--- @param id         ImGuiID
--- @param item_flags ImGuiItemFlags
function ImGui.ItemHoverable(bb, id, item_flags)
    local g = GImGui
    local window = g.CurrentWindow

if not IMGUI_DISABLE_DEBUG_TOOLS then
    if id ~= 0 and g.HoveredIdPreviousFrame == id and bit32.band(item_flags, ImGuiItemFlags.AllowDuplicateId) == 0 then
        g.HoveredIdPreviousFrameItemCount = g.HoveredIdPreviousFrameItemCount + 1
        if g.DebugDrawIdConflictsId == id then
            window.DrawList:AddRect(bb.Min - ImVec2(1, 1), bb.Max + ImVec2(1, 1), IM_COL32(255, 0, 0, 255), 0.0, 2.0, ImDrawFlags.None)
        end
    end
end

    if g.HoveredWindow ~= window then
        return false
    end

    if not ImGui.IsMouseHoveringRect(bb.Min, bb.Max) then
        return false
    end

    if g.HoveredId ~= 0 and g.HoveredId ~= id and not g.HoveredIdAllowOverlap then
        return false
    end

    if g.ActiveId ~= 0 and g.ActiveId ~= id and not g.ActiveIdAllowOverlap then
        if not g.ActiveIdFromShortcut then
            return false
        end
    end

    if (bit32.band(item_flags, ImGuiItemFlags.NoWindowHoverableCheck) == 0) and not ImGui.IsWindowContentHoverable(window, ImGuiHoveredFlags.None) then
        g.HoveredIdIsDisabled = true
        return false
    end

    if id ~= 0 then
        if g.DragDropActive and g.DragDropPayload.SourceId == id and (bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.SourceNoDisableHover) == 0) then
            return false
        end

        ImGui.SetHoveredID(id)

        if bit32.band(item_flags, ImGuiItemFlags.AllowOverlap) ~= 0 then
            g.HoveredIdAllowOverlap = true
            if g.HoveredIdPreviousFrame ~= id then
                return false
            end
        end

        if id == g.LastItemData.ID and (bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasShortcut) ~= 0) and g.ActiveId ~= id then
            if ImGui.IsItemHovered(bit32.bor(ImGuiHoveredFlags.ForTooltip, ImGuiHoveredFlags.DelayNormal)) then
                ImGui.SetTooltip("%s", ImGui.GetKeyChordName(g.LastItemData.Shortcut))
            end
        end
    end

    if bit32.band(item_flags, ImGuiItemFlags.Disabled) ~= 0 then
        -- Release active id if turning disabled
        if g.ActiveId == id and id ~= 0 then
            ImGui.ClearActiveID()
        end
        g.HoveredIdIsDisabled = true
        return false
    end

    if g.NavHighlightItemUnderNav and (bit32.band(item_flags, ImGuiItemFlags.NoNavDisableMouseHover) == 0) then
        return false
    end

    return true
end

--- @param bb ImRect
--- @param id ImGuiID
--- @return bool
function ImGui.IsClippedEx(bb, id)
    local g = GImGui
    local window = g.CurrentWindow
    if not bb:Overlaps(window.ClipRect) then
        if id == 0 or (id ~= g.ActiveId and id ~= g.ActiveIdPreviousFrame and id ~= g.NavId and id ~= g.NavActivateId) then
            if not g.ItemUnclipByLog then
                return true
            end
        end
    end
    return false
end

--- @param item_id      ImGuiID
--- @param item_flags   ImGuiItemFlags
--- @param status_flags ImGuiItemStatusFlags
--- @param item_rect    ImRect
function ImGui.SetLastItemData(item_id, item_flags, status_flags, item_rect)
    local g = GImGui
    g.LastItemData.ID = item_id
    g.LastItemData.ItemFlags = item_flags
    g.LastItemData.StatusFlags = status_flags
    ImRect_Copy(g.LastItemData.Rect, item_rect)
    ImRect_Copy(g.LastItemData.NavRect, item_rect)
end

--- @param window ImGuiWindow
--- @param rect   ImRect
function ImGui.SetLastItemDataForWindow(window, rect)
    local g = GImGui
    if window.DockIsActive then
        ImGui.SetLastItemData(window.MoveId, g.CurrentItemFlags, window.DC.DockTabItemStatusFlags, window.DC.DockTabItemRect)
    else
        ImGui.SetLastItemData(window.MoveId, g.CurrentItemFlags, window.DC.WindowItemStatusFlags, rect)
    end
end

--- @param c unsigned_int
function MT.ImGuiIO:AddInputCharacter(c)
    IM_ASSERT(self.Ctx ~= nil)
    local g = self.Ctx
    if c == 0 or not self.AppAcceptingEvents then
        return
    end

    local e = ImGuiInputEvent()
    e.Type = ImGuiInputEventType.Text
    e.Source = ImGuiInputSource.Keyboard
    e.EventId = g.InputEventsNextEventId
    g.InputEventsNextEventId = g.InputEventsNextEventId + 1
    e.Text = ImGuiInputEventText()
    e.Text.Char = c

    g.InputEventsQueue:push_back(e)
end

--- @param c ImWchar16
function MT.ImGuiIO:AddInputCharacterUTF16(c)
    if (c == 0 and self.InputQueueSurrogate == 0) or not self.AppAcceptingEvents then
        return
    end

    if bit32.band(c, 0xFC00) == 0xD800 then -- High surrogate, must save
        if self.InputQueueSurrogate ~= 0 then
            self:AddInputCharacter(IM_UNICODE_CODEPOINT_INVALID)
        end
        self.InputQueueSurrogate = c
        return
    end

    local cp = c
    if self.InputQueueSurrogate ~= 0 then
        if bit32.band(c, 0xFC00) ~= 0xDC00 then  -- Invalid low surrogate
            self:AddInputCharacter(IM_UNICODE_CODEPOINT_INVALID)
        else
            -- #if IM_UNICODE_CODEPOINT_MAX == 0xFFFF
            cp = IM_UNICODE_CODEPOINT_INVALID
            -- #endif
        end

        self.InputQueueSurrogate = 0
    end
    self:AddInputCharacter(cp)
end

function MT.ImGuiIO:ClearEventsQueue()
    IM_ASSERT(self.Ctx ~= nil)
    local g = GImGui
    g.InputEventsQueue:clear()
end

function MT.ImGuiIO:ClearInputKeys()
    local g = self.Ctx
    for key = ImGuiKey.NamedKey_BEGIN, ImGuiKey.NamedKey_END - 1 do
        if not ImGui.IsMouseKey(key) then
            local key_data = g.IO.KeysData[key - ImGuiKey.NamedKey_BEGIN]
            key_data.Down = false
            key_data.DownDuration = -1.0
            key_data.DownDurationPrev = -1.0
        end
    end
    self.KeyCtrl  = false
    self.KeyShift = false
    self.KeyAlt   = false
    self.KeySuper = false
    self.KeyMods  = ImGuiMod_None
    self.InputQueueCharacters:resize(0)
end

function MT.ImGuiIO:ClearInputMouse()
    for key = ImGuiKey_Mouse_BEGIN, ImGuiKey_Mouse_END - 1 do
        local key_data = self.KeysData[key - ImGuiKey.NamedKey_BEGIN]
        if key_data then
            key_data.Down = false
            key_data.DownDuration = -1.0
            key_data.DownDurationPrev = -1.0
        end
    end

    self.MousePos = ImVec2(-FLT_MAX, -FLT_MAX)

    for n = 0, 2 do -- IM_COUNTOF(MouseDown)
        self.MouseDown[n] = false
        self.MouseDownDuration[n] = -1.0
        self.MouseDownDurationPrev[n] = -1.0
    end

    self.MouseWheel = 0
    self.MouseWheelH = 0
end

--- @param ctx  ImGuiContext
--- @param type ImGuiInputEventType
--- @param arg? int
--- @return ImGuiInputEvent?
function MT.ImGuiIO:FindLatestInputEvent(ctx, type, arg)
    if arg == nil then arg = -1 end

    local g = ctx
    for n = g.InputEventsQueue.Size, 1, -1 do
        local e = g.InputEventsQueue.Data[n]

        if e.Type ~= type then
        elseif type == ImGuiInputEventType.Key and e.Key.Key ~= arg then
        elseif type == ImGuiInputEventType.MouseButton and e.MouseButton.Button ~= arg then
        else
            return e
        end
    end

    return nil
end

--- @param key          ImGuiKey
--- @param down         bool
--- @param analog_value float
function MT.ImGuiIO:AddKeyAnalogEvent(key, down, analog_value)
    IM_ASSERT(self.Ctx ~= nil)
    if key == ImGuiKey.None or not self.AppAcceptingEvents then
        return
    end

    local g = self.Ctx
    IM_ASSERT(ImGui.IsNamedKeyOrMod(key))
    IM_ASSERT(ImGui.IsAliasKey(key) == false)

    -- MacOS: swap Cmd(Super) and Ctrl
    if (g.IO.ConfigMacOSXBehaviors) then
        if (key == ImGuiMod_Super)          then key = ImGuiMod_Ctrl
        elseif (key == ImGuiMod_Ctrl)       then key = ImGuiMod_Super
        elseif (key == ImGuiKey.LeftSuper)  then key = ImGuiKey.LeftCtrl
        elseif (key == ImGuiKey.RightSuper) then key = ImGuiKey.RightCtrl
        elseif (key == ImGuiKey.LeftCtrl)   then key = ImGuiKey.LeftSuper
        elseif (key == ImGuiKey.RightCtrl)  then key = ImGuiKey.RightSuper
        end
    end

    local latest_event = self:FindLatestInputEvent(g, ImGuiInputEventType.Key, key)
    local key_data = ImGui.GetKeyData(g, key)
    local latest_key_down = latest_event and latest_event.Key.Down or key_data.Down
    local latest_key_analog = latest_event and latest_event.Key.AnalogValue or key_data.AnalogValue
    if latest_key_down == down and latest_key_analog == analog_value then
        return
    end

    local e = ImGuiInputEvent()
    e.Type = ImGuiInputEventType.Key
    e.Source = ImGui.IsGamepadKey(key) and ImGuiInputSource.Gamepad or ImGuiInputSource.Keyboard
    e.EventId = g.InputEventsNextEventId
    g.InputEventsNextEventId = g.InputEventsNextEventId + 1
    e.Key = ImGuiInputEventKey()
    e.Key.Key = key
    e.Key.Down = down
    e.Key.AnalogValue = analog_value
    g.InputEventsQueue:push_back(e)
end

--- @param key  ImGuiKey
--- @param down bool
function MT.ImGuiIO:AddKeyEvent(key, down)
    if not self.AppAcceptingEvents then
        return
    end
    self:AddKeyAnalogEvent(key, down, (down and 1.0 or 0.0))
end

--- @param accepting_events bool
function MT.ImGuiIO:SetAppAcceptingEvents(accepting_events)
    self.AppAcceptingEvents = accepting_events
end

--- @param source ImGuiMouseSource
function MT.ImGuiIO:AddMouseSourceEvent(source)
    IM_ASSERT(self.Ctx ~= nil)
    local g = self.Ctx
    g.InputEventsNextMouseSource = source
end

--- @param viewport_id ImGuiID
function MT.ImGuiIO:AddMouseViewportEvent(viewport_id)
    IM_ASSERT(self.Ctx ~= nil)
    local g = self.Ctx
    -- IM_ASSERT(g.IO.BackendFlags & ImGuiBackendFlags.HasMouseHoveredViewport);
    if (not self.AppAcceptingEvents) then
        return
    end

    -- Filter duplicate
    local latest_event = self:FindLatestInputEvent(g, ImGuiInputEventType.MouseViewport)
    local latest_viewport_id
    if latest_event then
        latest_viewport_id = latest_event.MouseViewport.HoveredViewportID
    else
        latest_viewport_id = g.IO.MouseHoveredViewport
    end
    if (latest_viewport_id == viewport_id) then
        return
    end

    local e = ImGuiInputEvent()
    e.Type = ImGuiInputEventType.MouseViewport
    e.Source = ImGuiInputSource.Mouse
    e.MouseViewport = ImGuiInputEventMouseViewport()
    e.MouseViewport.HoveredViewportID = viewport_id
    g.InputEventsQueue:push_back(e)
end

--- @param focused bool
function MT.ImGuiIO:AddFocusEvent(focused)
    IM_ASSERT(self.Ctx ~= nil)
    local g = self.Ctx

    local latest_event = self:FindLatestInputEvent(g, ImGuiInputEventType.Focus)
    local latest_focused = latest_event and latest_event.AppFocused.Focused or (not g.IO.AppFocusLost)
    if latest_focused == focused or (self.ConfigDebugIgnoreFocusLoss and not focused) then
        return
    end

    local e = ImGuiInputEvent()
    e.Type = ImGuiInputEventType.Focus
    e.EventId = g.InputEventsNextEventId
    g.InputEventsNextEventId = g.InputEventsNextEventId + 1
    e.AppFocused = ImGuiInputEventAppFocused()
    e.AppFocused.Focused = focused
    g.InputEventsQueue:push_back(e)
end

--- @param x float
--- @param y float
function MT.ImGuiIO:AddMousePosEvent(x, y)
    IM_ASSERT(self.Ctx ~= nil)
    if not self.AppAcceptingEvents then
        return
    end

    local g = self.Ctx

    local x_val = x
    if x > -FLT_MAX then
        x_val = ImFloor(x)
    end
    local y_val = y
    if y > -FLT_MAX then
        y_val = ImFloor(y)
    end

    local latest_event = self:FindLatestInputEvent(g, ImGuiInputEventType.MousePos)
    local latest_pos = latest_event and ImVec2(latest_event.MousePos.PosX, latest_event.MousePos.PosY) or self.MousePos
    if latest_pos.x == x_val and latest_pos.y == y_val then
        return
    end

    local e = ImGuiInputEvent()
    e.Type = ImGuiInputEventType.MousePos
    e.Source = ImGuiInputSource.Mouse
    e.EventId = g.InputEventsNextEventId
    g.InputEventsNextEventId = g.InputEventsNextEventId + 1
    e.MousePos = ImGuiInputEventMousePos()
    e.MousePos.PosX = x_val
    e.MousePos.PosY = y_val
    e.MousePos.MouseSource = g.InputEventsNextMouseSource
    g.InputEventsQueue:push_back(e)
end

--- @param mouse_button ImGuiMouseButton
--- @param down         bool
function MT.ImGuiIO:AddMouseButtonEvent(mouse_button, down)
    IM_ASSERT(self.Ctx ~= nil)
    local g = self.Ctx
    IM_ASSERT(mouse_button >= 0 and mouse_button < ImGuiMouseButton.COUNT)
    if not self.AppAcceptingEvents then
        return
    end

    -- On MacOS X: Convert Ctrl(Super)+Left click into Right-click: handle held button.
    if self.ConfigMacOSXBehaviors and mouse_button == 0 and g.IO.MouseCtrlLeftAsRightClick then
        -- Order of both statements matters: this event will still release mouse button 1
        mouse_button = 1
        if not down then
            self.MouseCtrlLeftAsRightClick = false
        end
    end

    local latest_event = self:FindLatestInputEvent(g, ImGuiInputEventType.MouseButton, mouse_button)
    local latest_button_down = latest_event and latest_event.MouseButton.Down or self.MouseDown[mouse_button]
    if latest_button_down == down then
        return
    end

    -- On MacOS X: Convert Ctrl(Super)+Left click into Right-click.
    -- - Note that this is actual physical Ctrl which is ImGuiMod_Super for us.
    -- - At this point we want from !down to down, so this is handling the initial press.
    if self.ConfigMacOSXBehaviors and mouse_button == 0 and down then
        local latest_super_event = self:FindLatestInputEvent(g, ImGuiInputEventType.Key, ImGuiMod_Super)
        if latest_super_event and latest_super_event.Key.Down or self.KeySuper then
            -- IMGUI_DEBUG_LOG_IO("[io] Super+Left Click aliased into Right Click\n")
            self.MouseCtrlLeftAsRightClick = true
            self:AddMouseButtonEvent(1, true) -- This is just quicker to write that passing through, as we need to filter duplicate again.
            return
        end
    end

    local e = ImGuiInputEvent()
    e.Type = ImGuiInputEventType.MouseButton
    e.Source = ImGuiInputSource.Mouse
    e.EventId = g.InputEventsNextEventId
    g.InputEventsNextEventId = g.InputEventsNextEventId + 1
    e.MouseButton = ImGuiInputEventMouseButton()
    e.MouseButton.Button = mouse_button
    e.MouseButton.Down = down
    e.MouseButton.MouseSource = g.InputEventsNextMouseSource
    g.InputEventsQueue:push_back(e)
end

--- @param wheel_x float
--- @param wheel_y float
function MT.ImGuiIO:AddMouseWheelEvent(wheel_x, wheel_y)
    IM_ASSERT(self.Ctx ~= nil)
    local g = self.Ctx
    if not self.AppAcceptingEvents or (wheel_x == 0 and wheel_y == 0) then
        return
    end

    local e = ImGuiInputEvent()
    e.Type = ImGuiInputEventType.MouseWheel
    e.Source = ImGuiInputSource.Mouse
    e.EventId = g.InputEventsNextEventId
    g.InputEventsNextEventId = g.InputEventsNextEventId + 1
    e.MouseWheel = ImGuiInputEventMouseWheel()
    e.MouseWheel.WheelX = wheel_x
    e.MouseWheel.WheelY = wheel_y
    e.MouseWheel.MouseSource = g.InputEventsNextMouseSource
    g.InputEventsQueue:push_back(e)
end

--- @param key ImGuiKey
local function GetModForLRModKey(key)
    if key == ImGuiKey.LeftCtrl or key == ImGuiKey.RightCtrl then
        return ImGuiMod_Ctrl
    end
    if key == ImGuiKey.LeftShift or key == ImGuiKey.RightShift then
        return ImGuiMod_Shift
    end
    if key == ImGuiKey.LeftAlt or key == ImGuiKey.RightAlt then
        return ImGuiMod_Alt
    end
    if key == ImGuiKey.LeftSuper or key == ImGuiKey.RightSuper then
        return ImGuiMod_Super
    end
    return ImGuiMod_None
end

--- @param key_chord ImGuiKeyChord
function ImGui.FixupKeyChord(key_chord)
    local key = bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_))
    if ImGui.IsLRModKey(key) then
        key_chord = bit32.bor(key_chord, GetModForLRModKey(key))
    end
    return key_chord
end

--- @param ctx? ImGuiContext
--- @param key  ImGuiKey
--- @return ImGuiKeyData, int
function ImGui.GetKeyData(ctx, key)
    if ctx == nil then ctx = GImGui end

    if bit32.band(key, ImGuiMod_Mask_) ~= 0 then
        key = ImGui.ConvertSingleModFlagToKey(key)
    end

    IM_ASSERT(ImGui.IsNamedKey(key), "Support for user key indices was dropped in favor of ImGuiKey. Please update backend & user code.")
    local idx = key - ImGuiKey.NamedKey_BEGIN
    return ctx.IO.KeysData[idx], idx
end

--- @param key_left  ImGuiKey
--- @param key_right ImGuiKey
--- @param key_up    ImGuiKey
--- @param key_down  ImGuiKey
function ImGui.GetKeyMagnitude2d(key_left, key_right, key_up, key_down)
    return ImVec2(
        ImGui.GetKeyData(nil, key_right).AnalogValue - ImGui.GetKeyData(nil, key_left).AnalogValue,
        ImGui.GetKeyData(nil, key_down).AnalogValue - ImGui.GetKeyData(nil, key_up).AnalogValue
    )
end

--- @param key      ImGuiKey
--- @param owner_id ImGuiID
function ImGui.TestKeyOwner(key, owner_id)
    if not ImGui.IsNamedKeyOrMod(key) then
        return true
    end

    local g = GImGui --- @cast g ImGuiContext
    if g.ActiveIdUsingAllKeyboardKeys and owner_id ~= g.ActiveId and owner_id ~= ImGuiKeyOwner_Any then
        if key >= ImGuiKey_Keyboard_BEGIN and key < ImGuiKey_Keyboard_END then
            return false
        end
    end

    local owner_data = ImGui.GetKeyOwnerData(g, key)
    if owner_id == ImGuiKeyOwner_Any then
        return not owner_data.LockThisFrame
    end

    if owner_data.OwnerCurr ~= owner_id then
        if owner_data.LockThisFrame then
            return false
        end
        if owner_data.OwnerCurr ~= ImGuiKeyOwner_NoOwner then
            return false
        end
    end

    return true
end

--- @param key       ImGuiKey
--- @param owner_id? ImGuiID
function ImGui.IsKeyDown(key, owner_id)
    if owner_id == nil then owner_id = ImGuiKeyOwner_Any end

    local key_data = ImGui.GetKeyData(nil, key)
    if not key_data.Down then
        return false
    end
    if not ImGui.TestKeyOwner(key, owner_id) then
        return false
    end
    return true
end

--- @param key        ImGuiKey
--- @param is_repeat? bool
function ImGui.IsKeyPressed(key, is_repeat)
    if is_repeat == nil then is_repeat = true end

    return ImGui.IsKeyPressedEx(key, is_repeat and ImGuiInputFlags.Repeat or ImGuiInputFlags.None, ImGuiKeyOwner_Any)
end

--- @param key       ImGuiKey
--- @param owner_id? ImGuiID
--- @return bool
function ImGui.IsKeyReleased(key, owner_id)
    if owner_id == nil then owner_id = ImGuiKeyOwner_Any end

    local key_data = ImGui.GetKeyData(nil, key)
    if key_data.DownDurationPrev < 0.0 or key_data.Down then
        return false
    end
    if not ImGui.TestKeyOwner(key, owner_id) then
        return false
    end
    return true
end

--- @param key       ImGuiKey
--- @param flags     ImGuiInputFlags
--- @param owner_id? ImGuiID
function ImGui.IsKeyPressedEx(key, flags, owner_id)
    if owner_id == nil then owner_id = 0 end

    local g = GImGui
    local key_data = ImGui.GetKeyData(g, key)

    -- In theory this should already be encoded as (DownDuration < 0.0), but testing this facilitates eating mechanism (until we finish work on key ownership)
    if not key_data.Down then
        return false
    end
    local t = key_data.DownDuration
    if t < 0.0 then
        return false
    end
    IM_ASSERT(bit32.band(flags, bit32.bnot(ImGuiInputFlags.SupportedByIsKeyPressed)) == 0) -- Passing flags not supported by this function!
    if bit32.band(flags, bit32.bor(ImGuiInputFlags.RepeatRateMask_, ImGuiInputFlags.RepeatUntilMask_)) ~= 0 then -- Setting any _RepeatXXX option enables _Repeat
        flags = bit32.bor(flags, ImGuiInputFlags.Repeat)
    end

    local pressed = (t == 0.0)
    if not pressed and bit32.band(flags, ImGuiInputFlags.Repeat) ~= 0 then
        local repeat_delay, repeat_rate = ImGui.GetTypematicRepeatRate(flags)
        pressed = (t > repeat_delay) and (ImGui.GetKeyPressedAmount(key, repeat_delay, repeat_rate) > 0)
        if pressed and bit32.band(flags, ImGuiInputFlags.RepeatUntilMask_) ~= 0 then
            -- Slightly bias 'key_pressed_time' as DownDuration is an accumulation of DeltaTime which we compare to an absolute time value.
            -- Ideally we'd replace DownDuration with KeyPressedTime but it would break user's code.
            local key_pressed_time = g.Time - t + 0.00001
            if bit32.band(flags, ImGuiInputFlags.RepeatUntilKeyModsChange) ~= 0 and g.LastKeyModsChangeTime > key_pressed_time then
                pressed = false
            end
            if bit32.band(flags, ImGuiInputFlags.RepeatUntilKeyModsChangeFromNone) ~= 0 and g.LastKeyModsChangeFromNoneTime > key_pressed_time then
                pressed = false
            end
            if bit32.band(flags, ImGuiInputFlags.RepeatUntilOtherKeyPress) ~= 0 and g.LastKeyboardKeyPressTime > key_pressed_time then
                pressed = false
            end
        end
    end

    if not pressed then
        return false
    end
    if not ImGui.TestKeyOwner(key, owner_id) then
        return false
    end

    return true
end

-- TODO:
function ImGui.GetKeyChordName(key_chord)
    local key = bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_))
    if ImGui.IsLRModKey(key) then
        key_chord = bit32.band(key_chord, bit32.bnot(GetModForLRModKey(key))) -- Return "Ctrl+LeftShift" instead of "Ctrl+Shift+LeftShift"
    end
    local s = ((bit32.band(key_chord, ImGuiMod_Ctrl) ~= 0) and "Ctrl+" or "")
        .. ((bit32.band(key_chord, ImGuiMod_Shift) ~= 0) and "Shift+" or "")
        .. ((bit32.band(key_chord, ImGuiMod_Alt) ~= 0) and "Alt+" or "")
        .. ((bit32.band(key_chord, ImGuiMod_Super) ~= 0) and "Super+" or "")
        .. ((key ~= ImGuiKey.None or key_chord == ImGuiKey.None) and ImGui.GetKeyName(key) or "")
    if key == ImGuiKey.None and key_chord ~= 0 and #s > 0 then
        s = string.sub(s, 1, #s - 1) -- Remove trailing '+'
    end
    return s
end

local GKeyNames = {
    "Tab", "LeftArrow", "RightArrow", "UpArrow", "DownArrow", "PageUp", "PageDown",
    "Home", "End", "Insert", "Delete", "Backspace", "Space", "Enter", "Escape",
    "LeftCtrl", "LeftShift", "LeftAlt", "LeftSuper", "RightCtrl", "RightShift", "RightAlt", "RightSuper", "Menu",
    "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F", "G", "H",
    "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y", "Z",
    "F1", "F2", "F3", "F4", "F5", "F6", "F7", "F8", "F9", "F10", "F11", "F12",
    "F13", "F14", "F15", "F16", "F17", "F18", "F19", "F20", "F21", "F22", "F23", "F24",
    "Apostrophe", "Comma", "Minus", "Period", "Slash", "Semicolon", "Equal", "LeftBracket",
    "Backslash", "RightBracket", "GraveAccent", "CapsLock", "ScrollLock", "NumLock", "PrintScreen",
    "Pause", "Keypad0", "Keypad1", "Keypad2", "Keypad3", "Keypad4", "Keypad5", "Keypad6",
    "Keypad7", "Keypad8", "Keypad9", "KeypadDecimal", "KeypadDivide", "KeypadMultiply",
    "KeypadSubtract", "KeypadAdd", "KeypadEnter", "KeypadEqual",
    "AppBack", "AppForward", "Oem102",
    "GamepadStart", "GamepadBack",
    "GamepadFaceLeft", "GamepadFaceRight", "GamepadFaceUp", "GamepadFaceDown",
    "GamepadDpadLeft", "GamepadDpadRight", "GamepadDpadUp", "GamepadDpadDown",
    "GamepadL1", "GamepadR1", "GamepadL2", "GamepadR2", "GamepadL3", "GamepadR3",
    "GamepadLStickLeft", "GamepadLStickRight", "GamepadLStickUp", "GamepadLStickDown",
    "GamepadRStickLeft", "GamepadRStickRight", "GamepadRStickUp", "GamepadRStickDown",
    "MouseLeft", "MouseRight", "MouseMiddle", "MouseX1", "MouseX2", "MouseWheelX", "MouseWheelY",
    "ModCtrl", "ModShift", "ModAlt", "ModSuper", -- ReservedForModXXX are showing the ModXXX names.
}

--- @param key ImGuiKey
--- @return string
function ImGui.GetKeyName(key)
    if key == ImGuiKey.None then
        return "None"
    end
    IM_ASSERT(ImGui.IsNamedKeyOrMod(key), "Support for user key indices was dropped in favor of ImGuiKey. Please update backend and user code.")
    if bit32.band(key, ImGuiMod_Mask_) ~= 0 then
        key = ImGui.ConvertSingleModFlagToKey(key)
    end
    if not ImGui.IsNamedKey(key) then
        return "Unknown"
    end
    return GKeyNames[key - ImGuiKey.NamedKey_BEGIN + 1] or "Unknown"
end

--- @param key ImGuiKey
--- @return ImGuiID
function ImGui.GetKeyOwner(key)
    if not ImGui.IsNamedKeyOrMod(key) then
        return ImGuiKeyOwner_NoOwner
    end

    local g = GImGui
    local owner_data = ImGui.GetKeyOwnerData(g, key)
    local owner_id = owner_data.OwnerCurr

    if g.ActiveIdUsingAllKeyboardKeys and owner_id ~= g.ActiveId and owner_id ~= ImGuiKeyOwner_Any then
        if key >= ImGuiKey_Keyboard_BEGIN and key < ImGuiKey_Keyboard_END then
            return ImGuiKeyOwner_NoOwner
        end
    end

    return owner_id
end

--- @param t0           float
--- @param t1           float
--- @param repeat_delay float
--- @param repeat_rate  float
function ImGui.CalcTypematicRepeatAmount(t0, t1, repeat_delay, repeat_rate)
    if t1 == 0.0 then return 1 end
    if t0 >= t1 then return 0 end
    if repeat_rate <= 0.0 then
        if t0 < repeat_delay and t1 >= repeat_delay then
            return 1
        else
            return 0
        end
    end

    local count_t0
    if t0 < repeat_delay then
        count_t0 = -1
    else
        count_t0 = math.floor((t0 - repeat_delay) / repeat_rate)
    end

    local count_t1
    if t1 < repeat_delay then
        count_t1 = -1
    else
        count_t1 = math.floor((t1 - repeat_delay) / repeat_rate)
    end

    return count_t1 - count_t0
end

--- @param flags        ImGuiInputFlags
--- @return float repeat_delay
--- @return float repeat_rate
function ImGui.GetTypematicRepeatRate(flags)
    local g = GImGui
    flags = bit32.band(flags, ImGuiInputFlags.RepeatRateMask_)
    if     flags == ImGuiInputFlags.RepeatRateNavMove  then repeat_delay = g.IO.KeyRepeatDelay * 0.72; repeat_rate = g.IO.KeyRepeatRate * 0.80; return repeat_delay, repeat_rate
    elseif flags == ImGuiInputFlags.RepeatRateNavTweak then repeat_delay = g.IO.KeyRepeatDelay * 0.72; repeat_rate = g.IO.KeyRepeatRate * 0.30; return repeat_delay, repeat_rate
    else                                                    repeat_delay = g.IO.KeyRepeatDelay * 1.00; repeat_rate = g.IO.KeyRepeatRate * 1.00; return repeat_delay, repeat_rate end
end

--- @param key          ImGuiKey
--- @param repeat_delay float
--- @param repeat_rate  float
function ImGui.GetKeyPressedAmount(key, repeat_delay, repeat_rate)
    local g = GImGui
    local key_data = ImGui.GetKeyData(g, key)
    if not key_data.Down then -- In theory this should already be encoded as (DownDuration < 0.0f), but testing this facilitates eating mechanism (until we finish work on key ownership)
        return 0
    end
    local t = key_data.DownDuration
    return ImGui.CalcTypematicRepeatAmount(t - g.IO.DeltaTime, t, repeat_delay, repeat_rate)
end

--- @param rt ImGuiKeyRoutingTable
function ImGui.UpdateKeyRoutingTable(rt)
    local g = GImGui --[[@as ImGuiContext]]
    rt.EntriesNext:resize(0)
    for key = ImGuiKey.NamedKey_BEGIN, ImGuiKey.NamedKey_END - 1 do
        local new_routing_start_idx = rt.EntriesNext.Size + 1
        local routing_entry
        local old_routing_idx = rt.Index[key - ImGuiKey.NamedKey_BEGIN + 1]
        while old_routing_idx ~= -1 do
            repeat
            routing_entry = rt.Entries[old_routing_idx]
            routing_entry.RoutingCurrScore = routing_entry.RoutingNextScore
            routing_entry.RoutingCurr = routing_entry.RoutingNext
            routing_entry.RoutingNext = ImGuiKeyOwner_NoOwner
            routing_entry.RoutingNextScore = 0
            if routing_entry.RoutingCurr == ImGuiKeyOwner_NoOwner then
                break
            end

            rt.EntriesNext:push_back(routing_entry)

            if routing_entry.Mods == g.IO.KeyMods then
                local owner_data = ImGui.GetKeyOwnerData(g, key)
                if owner_data.OwnerCurr == ImGuiKeyOwner_NoOwner then
                    owner_data.OwnerCurr = routing_entry.RoutingCurr
                end
            end

            until true

            old_routing_idx = routing_entry.NextEntryIndex
        end

        rt.Index[key - ImGuiKey.NamedKey_BEGIN + 1] = (new_routing_start_idx <= rt.EntriesNext.Size and new_routing_start_idx or -1)
        for n = new_routing_start_idx, rt.EntriesNext.Size do
            rt.EntriesNext[n].NextEntryIndex = (n + 1 <= rt.EntriesNext.Size) and (n + 1) or -1
        end
    end
    rt.Entries:swap(rt.EntriesNext)
end

-- owner_id may be None/Any, but routing_id needs to be always be set, so we default to GetCurrentFocusScope()
--- @param owner_id ImGuiID
local function GetRoutingIdFromOwnerId(owner_id)
    local g = GImGui
    return (owner_id ~= ImGuiKeyOwner_NoOwner and owner_id ~= ImGuiKeyOwner_Any) and owner_id or g.CurrentFocusScopeId
end

--- @param key_chord ImGuiKeyChord
--- @return ImGuiKeyRoutingData
function ImGui.GetShortcutRoutingData(key_chord)
    local g = GImGui
    local rt = g.KeysRoutingTable
    local key = bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_))
    local mods = bit32.band(key_chord, ImGuiMod_Mask_)
    if key == ImGuiKey.None then
        key = ImGui.ConvertSingleModFlagToKey(mods)
    end
    IM_ASSERT(ImGui.IsNamedKey(key))

    local routing_data
    local idx = rt.Index[key - ImGuiKey.NamedKey_BEGIN + 1]
    while idx ~= -1 do
        routing_data = rt.Entries.Data[idx]
        if routing_data.Mods == mods then
            return routing_data
        end

        idx = routing_data.NextEntryIndex
    end

    local routing_data_idx = rt.Entries.Size + 1
    rt.Entries:push_back(ImGuiKeyRoutingData())
    routing_data = rt.Entries[routing_data_idx]
    routing_data.Mods = mods
    routing_data.NextEntryIndex = rt.Index[key - ImGuiKey.NamedKey_BEGIN + 1]
    rt.Index[key - ImGuiKey.NamedKey_BEGIN + 1] = routing_data_idx

    return routing_data
end

--- @param focus_scope_id ImGuiID
--- @param owner_id       ImGuiID
--- @param flags          ImGuiInputFlags
local function CalcRoutingScore(focus_scope_id, owner_id, flags)
    local g = GImGui
    if bit32.band(flags, ImGuiInputFlags.RouteFocused) ~= 0 then
        if owner_id ~= 0 and g.ActiveId == owner_id then
            return 300
        end

        if focus_scope_id == 0 then
            return 0
        end
        for index_in_focus_path = 1, g.NavFocusRoute.Size do
            if g.NavFocusRoute.Data[index_in_focus_path].ID == focus_scope_id then
                if bit32.band(flags, ImGuiInputFlags.RouteOverActive) ~= 0 then
                    return 599 - (index_in_focus_path - 1)
                else
                    return 199 - (index_in_focus_path - 1)
                end
            end
        end
        return 0
    elseif bit32.band(flags, ImGuiInputFlags.RouteActive) ~= 0 then
        if owner_id ~= 0 and g.ActiveId == owner_id then
            return 300
        end
        return 0
    elseif bit32.band(flags, ImGuiInputFlags.RouteGlobal) ~= 0 then
        if bit32.band(flags, ImGuiInputFlags.RouteOverActive) ~= 0 then
            return 400
        end
        if owner_id ~= 0 and g.ActiveId == owner_id then
            return 300
        end
        if bit32.band(flags, ImGuiInputFlags.RouteOverFocused) ~= 0 then
            return 200
        end
        return 1
    end
    IM_ASSERT(false)
    return 0
end

--- @param key_chord ImGuiKeyChord
local function IsKeyChordPotentiallyCharInput(key_chord)
    local g = GImGui

    local mods = bit32.band(key_chord, ImGuiMod_Mask_)
    local ignore_char_inputs = ((bit32.band(mods, ImGuiMod_Ctrl) ~= 0) and (bit32.band(mods, ImGuiMod_Alt) == 0)) or (g.IO.ConfigMacOSXBehaviors and (bit32.band(mods, ImGuiMod_Ctrl) ~= 0))
    if ignore_char_inputs then
        return false
    end

    local key = bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_))
    if key == ImGuiKey.None then
        return false
    end
    return g.KeysMayBeCharInput:TestBit(key + 1) -- TestBit requires 1-based index
end

--- @param key_chord ImGuiKeyChord
--- @param flags     ImGuiInputFlags
--- @param owner_id  ImGuiID
function ImGui.SetShortcutRouting(key_chord, flags, owner_id)
    local g = GImGui

    if bit32.band(flags, ImGuiInputFlags.RouteTypeMask_) == 0 then
        flags = bit32.bor(flags, ImGuiInputFlags.RouteGlobal, ImGuiInputFlags.RouteOverFocused, ImGuiInputFlags.RouteOverActive) -- IMPORTANT: This is the default for SetShortcutRouting() but NOT Shortcut()
    else
        IM_ASSERT(ImIsPowerOfTwo(bit32.band(flags, ImGuiInputFlags.RouteTypeMask_))) -- Check that only 1 routing flag is used
    end
    IM_ASSERT(owner_id ~= ImGuiKeyOwner_Any and owner_id ~= ImGuiKeyOwner_NoOwner)
    if bit32.band(flags, bit32.bor(ImGuiInputFlags.RouteOverFocused, ImGuiInputFlags.RouteUnlessBgFocused)) ~= 0 then
        IM_ASSERT(bit32.band(flags, ImGuiInputFlags.RouteGlobal) ~= 0)
    end
    if bit32.band(flags, ImGuiInputFlags.RouteOverActive) ~= 0 then
        IM_ASSERT(bit32.band(flags, bit32.bor(ImGuiInputFlags.RouteGlobal, ImGuiInputFlags.RouteFocused)) ~= 0)
    end

    key_chord = ImGui.FixupKeyChord(key_chord)

    if g.DebugBreakInShortcutRouting == key_chord then
        -- IM_DEBUG_BREAK()
    end

    if bit32.band(flags, ImGuiInputFlags.RouteUnlessBgFocused) ~= 0 then
        if g.NavWindow == nil then
            return false
        end
    end

    if bit32.band(flags, ImGuiInputFlags.RouteAlways) ~= 0 then
        -- IMGUI_DEBUG_LOG_INPUTROUTING("SetShortcutRouting(%s, flags=%04X, owner_id=0x%08X) -> always, no register", ImGui.GetKeyChordName(key_chord), flags, owner_id)
        return true
    end

    if g.ActiveId ~= 0 and g.ActiveId ~= owner_id then
        if bit32.band(flags, ImGuiInputFlags.RouteActive) ~= 0 then
            return false
        end

        if g.IO.WantTextInput and IsKeyChordPotentiallyCharInput(key_chord) then
            -- IMGUI_DEBUG_LOG_INPUTROUTING("SetShortcutRouting(%s, flags=%04X, owner_id=0x%08X) -> filtered as potential char input", ImGui.GetKeyChordName(key_chord), flags, owner_id)
            return false
        end

        if bit32.band(flags, ImGuiInputFlags.RouteOverActive) == 0 and g.ActiveIdUsingAllKeyboardKeys then
            local key = bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_))
            if key == ImGuiKey.None then
                key = ImGui.ConvertSingleModFlagToKey(bit32.band(key_chord, ImGuiMod_Mask_))
            end
            if key >= ImGuiKey_Keyboard_BEGIN and key < ImGuiKey_Keyboard_END then
                return false
            end
        end
    end

    local focus_scope_id = g.CurrentFocusScopeId
    if bit32.band(flags, ImGuiInputFlags.RouteFromRootWindow) ~= 0 then
        focus_scope_id = g.CurrentWindow.RootWindow.ID
    end

    local score = CalcRoutingScore(focus_scope_id, owner_id, flags)
    -- IMGUI_DEBUG_LOG_INPUTROUTING("SetShortcutRouting(%s, flags=%04X, owner_id=0x%08X) -> score %d", ImGui.GetKeyChordName(key_chord), flags, owner_id, score)
    if score == 0 then
        return false
    end

    local routing_data = ImGui.GetShortcutRoutingData(key_chord)
    if score > routing_data.RoutingNextScore then
        routing_data.RoutingNext = owner_id
        routing_data.RoutingNextScore = score
    end

    if routing_data.RoutingCurr == owner_id then
        -- IMGUI_DEBUG_LOG_INPUTROUTING("--> granting current route")
    end
    return routing_data.RoutingCurr == owner_id
end

--- @param mouse_pos? ImVec2
function ImGui.IsMousePosValid(mouse_pos)
    local MOUSE_INVALID = -256000.0
    local p
    if mouse_pos then p = mouse_pos else p = GImGui.IO.MousePos end
    return p.x >= MOUSE_INVALID and p.y >= MOUSE_INVALID
end

--- @return bool
function ImGui.IsAnyMouseDown()
    local g = GImGui
    for n = 0, 2 do -- IM_COUNTOF(g.IO.MouseDown) - 1
        if g.IO.MouseDown[n] then
            return true
        end
    end
    return false
end

--- @param button    ImGuiMouseButton
--- @param owner_id? ImGuiID
function ImGui.IsMouseDown(button, owner_id)
    if owner_id == nil then owner_id = ImGuiKeyOwner_Any end

    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
    return g.IO.MouseDown[button] and ImGui.TestKeyOwner(ImGui.MouseButtonToKey(button), owner_id)
end

--- @param button     ImGuiMouseButton
--- @param is_repeat? bool
function ImGui.IsMouseClicked(button, is_repeat)
    if is_repeat == nil then is_repeat = false end

    return ImGui.IsMouseClickedEx(button, is_repeat and ImGuiInputFlags.Repeat or ImGuiInputFlags.None, ImGuiKeyOwner_Any)
end

--- @param button     ImGuiMouseButton
--- @param flags      ImGuiInputFlags
--- @param owner_id?  ImGuiID
function ImGui.IsMouseClickedEx(button, flags, owner_id)
    if owner_id  == nil  then owner_id = ImGuiKeyOwner_Any end

    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)

    if not g.IO.MouseDown[button] then
        return false
    end
    local t = g.IO.MouseDownDuration[button]
    if t < 0.0 then
        return false
    end
    IM_ASSERT(bit32.band(flags, bit32.bnot(ImGuiInputFlags.SupportedByIsMouseClicked)) == 0)

    local is_repeat = (bit32.band(flags, ImGuiInputFlags.Repeat) ~= 0)
    local pressed = (t == 0.0) or (is_repeat and t > g.IO.KeyRepeatDelay and ImGui.CalcTypematicRepeatAmount(t - g.IO.DeltaTime, t, g.IO.KeyRepeatDelay, g.IO.KeyRepeatRate) > 0)

    if not pressed then
        return false
    end

    if not ImGui.TestKeyOwner(ImGui.MouseButtonToKey(button), owner_id) then
        return false
    end

    return true
end

--- @param button    ImGuiMouseButton
--- @param owner_id? ImGuiID
function ImGui.IsMouseReleased(button, owner_id)
    if owner_id == nil then owner_id = ImGuiKeyOwner_Any end

    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3) -- IM_COUNTOF(g.IO.MouseDown)
    return g.IO.MouseReleased[button] and ImGui.TestKeyOwner(ImGui.MouseButtonToKey(button), owner_id)
end

-- Use if you absolutely need to distinguish single-click from double-click by introducing a delay.
--- @param button ImGuiMouseButton
--- @param delay? float
function ImGui.IsMouseReleasedWithDelay(button, delay)
    if delay == nil then delay = -1.0 end
    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3)
    if ImGui.IsMouseDown(button) then
        return false
    end
    if delay < 0.0 then
        delay = g.IO.MouseSingleClickDelay or 0.50
    end
    local time_since_release = g.Time - g.IO.MouseReleasedTime[button]
    return (time_since_release - g.IO.DeltaTime < delay) and (time_since_release >= delay)
end

--- @param button    ImGuiMouseButton
--- @param owner_id? ImGuiID
function ImGui.IsMouseDoubleClicked(button, owner_id)
    if owner_id == nil then owner_id = ImGuiKeyOwner_Any end
    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3)
    return g.IO.MouseClickedCount[button] == 2 and ImGui.TestKeyOwner(ImGui.MouseButtonToKey(button), owner_id)
end

--- @param button ImGuiMouseButton
function ImGui.GetMouseClickedCount(button)
    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3)
    return g.IO.MouseClickedCount[button]
end

-- FIXME: This is close to what BeginDragDropSource() is doing, maybe rework.
--- @param mouse_button ImGuiMouseButton
local function LastItemOverlayButtonForNullId(mouse_button)
    local g = GImGui
    IM_ASSERT(g.LastItemData.ID == 0)
    local window = g.CurrentWindow
    local id = window:GetIDFromRectangle(g.LastItemData.Rect)
    if g.IO.MouseClicked[mouse_button] and ImGui.ItemHoverable(g.LastItemData.Rect, id, g.LastItemData.ItemFlags) then
        ImGui.SetActiveID(id, window)
        ImGui.FocusWindow(window)
    elseif g.ActiveId == id then
        ImGui.KeepAliveID(id)
        if not g.IO.MouseDown[mouse_button] then
            ImGui.ClearActiveID()
        end
    end
    return id
end

--- @param mouse_button? ImGuiMouseButton
--- @param delay?        float
--- @return int
function ImGui.GetItemClickedCountWithSingleClickDelay(mouse_button, delay)
    if mouse_button == nil then mouse_button = 0 end
    if delay == nil then delay = -1.0 end
    -- Action: double-click and subsequent clicks
    local g = GImGui
    if g.IO.MouseClickedCount[mouse_button] >= 2 and ImGui.IsItemClicked(mouse_button) then
        return g.IO.MouseClickedCount[mouse_button]
    end

    -- Action: second click, delayed
    local id = g.LastItemData.ID
    if id == 0 then
        id = LastItemOverlayButtonForNullId(mouse_button)
    end
    if g.LastActiveId == id then
        if delay >= 0.0 then
            delay = ImMax(delay, g.IO.MouseDoubleClickTime + 0.01)
        end
        if ImGui.IsMouseReleasedWithDelay(mouse_button, delay) and g.IO.MouseClickedLastCount[mouse_button] == 1 then
            return 1
        end
    end
    return 0
end

--- @return ImVec2 # Ref
function ImGui.GetMousePos()
    return GImGui.IO.MousePos
end

--- @return ImVec2
function ImGui.GetMousePosOnOpeningCurrentPopup()
    local g = GImGui
    if g.BeginPopupStack.Size > 0 then
        return g.BeginPopupStack.Data[g.BeginPopupStack.Size].OpenMousePos
    end
    return g.IO.MousePos
end

-- Return the delta from the initial clicking position while the mouse button is clicked or was just released.
--- @param button?         ImGuiMouseButton
--- @param lock_threshold? float
--- @return ImVec2
function ImGui.GetMouseDragDelta(button, lock_threshold)
    if button == nil then button = 0 end
    if lock_threshold == nil then lock_threshold = -1.0 end
    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3)
    if lock_threshold < 0.0 then
        lock_threshold = g.IO.MouseDragThreshold
    end
    if g.IO.MouseDown[button] or g.IO.MouseReleased[button] then
        if g.IO.MouseDragMaxDistanceSqr[button] >= lock_threshold * lock_threshold then
            if ImGui.IsMousePosValid(g.IO.MousePos) and ImGui.IsMousePosValid(g.IO.MouseClickedPos[button]) then
                return g.IO.MousePos - g.IO.MouseClickedPos[button]
            end
        end
    end
    return ImVec2(0.0, 0.0)
end

--- @param button? ImGuiMouseButton
function ImGui.ResetMouseDragDelta(button)
    if button == nil then button = 0 end
    local g = GImGui
    IM_ASSERT(button >= 0 and button < 3)
    -- NB: We don't need to reset g.IO.MouseDragMaxDistanceSqr
    ImVec2_Copy(g.IO.MouseClickedPos[button], g.IO.MousePos)
end

do

local key_changed_mask = ImBitArray(ImGuiKey.NamedKey_COUNT)

--- @param trickle_fast_inputs bool
function ImGui.UpdateInputEvents(trickle_fast_inputs)
    local g = GImGui
    local io = g.IO

    local trickle_interleaved_nonchar_keys_and_text = trickle_fast_inputs and g.WantTextInputNextFrame == 1

    local mouse_moved          = false
    local mouse_wheeled        = false
    local key_changed          = false
    local key_changed_nonchar  = false
    local text_inputted        = false
    local mouse_button_changed = 0x00

    key_changed_mask:ClearAllBits()

    local event_n = 1
    local stop_3231 = false
    while event_n <= g.InputEventsQueue.Size do
        repeat
        local e = g.InputEventsQueue.Data[event_n]
        if e.Type == ImGuiInputEventType.MousePos then
            if g.IO.WantSetMousePos then
                break
            end

            if trickle_fast_inputs and (mouse_button_changed ~= 0 or mouse_wheeled or key_changed or text_inputted) then
                stop_3231 = true; break
            end
            local event_pos = ImVec2(e.MousePos.PosX, e.MousePos.PosY)
            io.MousePos =  event_pos
            io.MouseSource = e.MousePos.MouseSource
            mouse_moved = true
        elseif e.Type == ImGuiInputEventType.MouseButton then
            local button = e.MouseButton.Button
            IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT)
            if trickle_fast_inputs and ((bit32.band(mouse_button_changed, bit32.lshift(1, button)) ~= 0) or mouse_wheeled) then
                stop_3231 = true; break
            end
            if trickle_fast_inputs and e.MouseButton.MouseSource == ImGuiMouseSource.TouchScreen and mouse_moved then
                stop_3231 = true; break
            end

            io.MouseDown[button] = e.MouseButton.Down
            io.MouseSource = e.MouseButton.MouseSource
            mouse_button_changed = bit32.bor(mouse_button_changed, bit32.lshift(1, button))
        elseif e.Type == ImGuiInputEventType.MouseWheel then
            if trickle_fast_inputs and (mouse_moved or mouse_button_changed ~= 0) then
                stop_3231 = true; break
            end

            io.MouseWheelH = io.MouseWheelH + e.MouseWheel.WheelX
            io.MouseWheel = io.MouseWheel + e.MouseWheel.WheelY
            io.MouseSource = e.MouseWheel.MouseSource
            mouse_wheeled = true
        elseif e.Type == ImGuiInputEventType.MouseViewport then
            io.MouseHoveredViewport = e.MouseViewport.HoveredViewportID
        elseif e.Type == ImGuiInputEventType.Key then
            -- Trickling Rule: Stop processing queued events if we got multiple action on the same button
            if bit32.band(io.ConfigFlags, ImGuiConfigFlags.NoKeyboard) ~= 0 then
                break
            end

            local key = e.Key.Key
            IM_ASSERT(key ~= ImGuiKey.None)

            -- TODO: Also gets 0-based index here, consider making key_data storage 1-based
            local key_data, key_data_index = ImGui.GetKeyData(g, key)

            if trickle_fast_inputs and key_data.Down ~= e.Key.Down and (key_changed_mask:TestBit(key_data_index + 1) or mouse_button_changed ~= 0) then
                stop_3231 = true; break
            end

            local key_is_potentially_for_char_input = IsKeyChordPotentiallyCharInput(bit32.bor(ImGui.GetMergedModsFromKeys(), key))
            if trickle_interleaved_nonchar_keys_and_text and (text_inputted and not key_is_potentially_for_char_input) then
                stop_3231 = true; break
            end

            if key_data.Down ~= e.Key.Down then
                key_changed = true
                key_changed_mask:SetBit(key_data_index + 1)
                if trickle_interleaved_nonchar_keys_and_text and not key_is_potentially_for_char_input then
                    key_changed_nonchar = true
                end
            end

            key_data.Down = e.Key.Down
            key_data.AnalogValue = e.Key.AnalogValue
        elseif e.Type == ImGuiInputEventType.Text then
            if bit32.band(io.ConfigFlags, ImGuiConfigFlags.NoKeyboard) ~= 0 then
                break
            end

            if trickle_fast_inputs and (mouse_button_changed ~= 0 or mouse_moved or mouse_wheeled) then
                stop_3231 = true; break
            end
            if trickle_interleaved_nonchar_keys_and_text and key_changed_nonchar then
                stop_3231 = true; break
            end
            local c = e.Text.Char
            io.InputQueueCharacters:push_back((c <= IM_UNICODE_CODEPOINT_MAX) and c or IM_UNICODE_CODEPOINT_INVALID)
            if trickle_interleaved_nonchar_keys_and_text then
                text_inputted = true
            end
        elseif e.Type == ImGuiInputEventType.Focus then
            local focus_lost = not e.AppFocused.Focused
            io.AppFocusLost = focus_lost
        else
            IM_ASSERT(false, "Unknown event!")
        end

        until true
        if stop_3231 then break end

        event_n = event_n + 1
    end

    if event_n == g.InputEventsQueue.Size + 1 then
        g.InputEventsQueue:resize(0)
    else
        for i = 1, event_n - 1 do
            g.InputEventsQueue:erase(1)
        end
    end

    if g.IO.AppFocusLost then
        g.IO:ClearInputKeys()
        g.IO:ClearInputMouse()
    end
end

end

--- @param key      ImGuiKey
--- @param owner_id ImGuiID
--- @param flags?   ImGuiInputFlags
function ImGui.SetKeyOwner(key, owner_id, flags)
    if flags == nil then flags = 0 end

    local g = GImGui --- @cast g ImGuiContext
    IM_ASSERT(ImGui.IsNamedKeyOrMod(key) and (owner_id ~= ImGuiKeyOwner_Any or (bit32.band(flags, bit32.bor(ImGuiInputFlags.LockThisFrame, ImGuiInputFlags.LockUntilRelease)) ~= 0)), "Can only use _Any with _LockXXX flags (to eat a key away without an ID to retrieve it)")
    IM_ASSERT(bit32.band(flags, bit32.bnot(ImGuiInputFlags.SupportedBySetKeyOwner)) == 0, "Passing flags not supported by this function!")

    local owner_data = ImGui.GetKeyOwnerData(g, key)
    owner_data.OwnerCurr = owner_id
    owner_data.OwnerNext = owner_id

    owner_data.LockUntilRelease = (bit32.band(flags, ImGuiInputFlags.LockUntilRelease) ~= 0)
    owner_data.LockThisFrame = (bit32.band(flags, ImGuiInputFlags.LockThisFrame) ~= 0) or owner_data.LockUntilRelease
end

-- Rarely used helper
--- @param key_chord ImGuiKeyChord
--- @param owner_id  ImGuiID
--- @param flags?    ImGuiInputFlags
function ImGui.SetKeyOwnersForKeyChord(key_chord, owner_id, flags)
    if flags == nil then flags = 0 end

    if bit32.band(key_chord, ImGuiMod_Ctrl) ~= 0 then
        ImGui.SetKeyOwner(ImGuiMod_Ctrl, owner_id, flags)
    end
    if bit32.band(key_chord, ImGuiMod_Shift) ~= 0 then
        ImGui.SetKeyOwner(ImGuiMod_Shift, owner_id, flags)
    end
    if bit32.band(key_chord, ImGuiMod_Alt) ~= 0 then
        ImGui.SetKeyOwner(ImGuiMod_Alt, owner_id, flags)
    end
    if bit32.band(key_chord, ImGuiMod_Super) ~= 0 then
        ImGui.SetKeyOwner(ImGuiMod_Super, owner_id, flags)
    end
    if bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_)) ~= 0 then
        ImGui.SetKeyOwner(bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_)), owner_id, flags)
    end
end

--- @param key    ImGuiKey
--- @param flags? ImGuiInputFlags
function ImGui.SetItemKeyOwner(key, flags)
    if flags == nil then flags = ImGuiInputFlags.None end

    local g = GImGui
    local id = g.LastItemData.ID
    if id == 0 or (g.HoveredId ~= id and g.ActiveId ~= id) then
        return false
    end
    if bit32.band(flags, ImGuiInputFlags.CondMask_) == 0 then
        flags = bit32.bor(flags, ImGuiInputFlags.CondDefault_)
    end
    if (g.HoveredId == id and bit32.band(flags, ImGuiInputFlags.CondHovered) ~= 0) or (g.ActiveId == id and bit32.band(flags, ImGuiInputFlags.CondActive) ~= 0) then
        IM_ASSERT(bit32.band(flags, bit32.bnot(ImGuiInputFlags.SupportedBySetItemKeyOwner)) == 0)
        if not ImGui.TestKeyOwner(key, id) then
            return false
        end
        ImGui.SetKeyOwner(key, id, bit32.band(flags, bit32.bnot(ImGuiInputFlags.CondMask_)))
        return true
    end
    return false
end

--- @param key_chord ImGuiKeyChord
--- @param flags     ImGuiInputFlags
--- @param owner_id  ImGuiID
function ImGui.IsKeyChordPressed(key_chord, flags, owner_id)
    local g = GImGui
    key_chord = ImGui.FixupKeyChord(key_chord)
    local mods = bit32.band(key_chord, ImGuiMod_Mask_)
    if g.IO.KeyMods ~= mods then
        return false
    end

    -- Special storage location for mods
    local key = bit32.band(key_chord, bit32.bnot(ImGuiMod_Mask_))
    if key == ImGuiKey.None then
        key = ImGui.ConvertSingleModFlagToKey(mods)
    end
    if not ImGui.IsKeyPressedEx(key, bit32.band(flags, ImGuiInputFlags.RepeatMask_), owner_id) then
        return false
    end
    return true
end

--- @param key_chord ImGuiKeyChord
--- @param flags?    ImGuiInputFlags
function ImGui.SetNextItemShortcut(key_chord, flags)
    if flags == nil then flags = 0 end

    local g = GImGui
    g.NextItemData.HasFlags = bit32.bor(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasShortcut)
    g.NextItemData.Shortcut = key_chord
    g.NextItemData.ShortcutFlags = flags
end

--- @param key_chord ImGuiKeyChord
--- @param flags     ImGuiInputFlags
--- @param owner_id  ImGuiID
function ImGui.Shortcut(key_chord, flags, owner_id)
    local g = GImGui
    -- IMGUI_DEBUG_LOG("Shortcut(%s, flags=%X, owner_id=0x%08X)", ImGui.GetKeyChordName(key_chord, g.TempBuffer.Data, g.TempBuffer.Size), flags, owner_id)

    -- When using (owner_id == 0/Any): SetShortcutRouting() will use CurrentFocusScopeId and filter with this, so IsKeyPressed() is fine with he 0/Any.
    if bit32.band(flags, ImGuiInputFlags.RouteTypeMask_) == 0 then
        flags = bit32.bor(flags, ImGuiInputFlags.RouteFocused)
    end

    -- Using 'owner_id == ImGuiKeyOwner_Any/0': auto-assign an owner based on current focus scope (each window has its focus scope by default)
    -- Effectively makes Shortcut() always input-owner aware.
    if owner_id == ImGuiKeyOwner_Any or owner_id == ImGuiKeyOwner_NoOwner then
        owner_id = GetRoutingIdFromOwnerId(owner_id)
    end

    if bit32.band(g.CurrentItemFlags, ImGuiItemFlags.Disabled) ~= 0 then
        return false
    end

    -- Submit route
    if not ImGui.SetShortcutRouting(key_chord, flags, owner_id) then
        return false
    end

    -- Default repeat behavior for Shortcut()
    -- So e.g. pressing Ctrl+W and releasing Ctrl while holding W will not trigger the W shortcut.
    if bit32.band(flags, ImGuiInputFlags.Repeat) ~= 0 and bit32.band(flags, ImGuiInputFlags.RepeatUntilMask_) == 0 then
        flags = bit32.bor(flags, ImGuiInputFlags.RepeatUntilKeyModsChange)
    end

    if not ImGui.IsKeyChordPressed(key_chord, flags, owner_id) then
        return false
    end

    -- Claim mods during the press
    ImGui.SetKeyOwnersForKeyChord(bit32.band(key_chord, ImGuiMod_Mask_), owner_id)

    IM_ASSERT(bit32.band(flags, bit32.bnot(ImGuiInputFlags.SupportedByShortcut)) == 0) -- Passing flags not supported by this function!
    return true
end

--- @param window ImGuiWindow
--- @return bool
function ImGui.IsWindowActiveAndVisible(window)
    return window.Active and not window.Hidden
end

--- @param window ImGuiWindow
--- @nodiscard
local function CalcWindowMinSize(window)
    local g = GImGui

    local size_min = ImVec2()

    if (bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0) and (bit32.band(window.Flags, ImGuiWindowFlags.Popup) == 0) then
        if bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeX) ~= 0 then
            size_min.x = g.Style.WindowMinSize.x
        else
            size_min.x = IMGUI_WINDOW_HARD_MIN_SIZE
        end

        if bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeY) ~= 0 then
            size_min.y = g.Style.WindowMinSize.y
        else
            size_min.y = IMGUI_WINDOW_HARD_MIN_SIZE
        end
    else
        if bit32.band(window.Flags, ImGuiWindowFlags.AlwaysAutoResize) == 0 then
            size_min.x = g.Style.WindowMinSize.x
        else
            size_min.x = IMGUI_WINDOW_HARD_MIN_SIZE
        end

        if bit32.band(window.Flags, ImGuiWindowFlags.AlwaysAutoResize) == 0 then
            size_min.y = g.Style.WindowMinSize.y
        else
            size_min.y = IMGUI_WINDOW_HARD_MIN_SIZE
        end
    end

    local window_for_height = window
    size_min.y = ImMax(size_min.y, window_for_height.TitleBarHeight + window_for_height.MenuBarHeight + ImMax(0, g.Style.WindowRounding - 1))

    return size_min
end

--- @param window       ImGuiWindow
--- @param size_desired ImVec2
--- @return ImVec2
--- @nodiscard
local function CalcWindowSizeAfterConstraint(window, size_desired)
    local g = GImGui

    local new_size = ImVec2()
    ImVec2_Copy(new_size, size_desired)

    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSizeConstraint) ~= 0 then
        local cr = ImRect()
        ImRect_Copy(cr, g.NextWindowData.SizeConstraintRect)

        new_size.x = (cr.Min.x >= 0 and cr.Max.x >= 0) and ImClamp(new_size.x, cr.Min.x, cr.Max.x) or window.SizeFull.x
        new_size.y = (cr.Min.y >= 0 and cr.Max.y >= 0) and ImClamp(new_size.y, cr.Min.y, cr.Max.y) or window.SizeFull.y
        if g.NextWindowData.SizeCallback then
            local data = {} -- TODO: ImGuiSizeCallbackData
            data.UserData = g.NextWindowData.SizeCallbackUserData
            data.Pos = ImVec2(window.Pos.x, window.Pos.y)
            data.CurrentSize = ImVec2(window.SizeFull.x, window.SizeFull.y)
            data.DesiredSize = ImVec2(new_size.x, new_size.y)
            g.NextWindowData.SizeCallback(data)
            new_size.x = data.DesiredSize.x
            new_size.y = data.DesiredSize.y
        end
        new_size.x = IM_TRUNC(new_size.x)
        new_size.y = IM_TRUNC(new_size.y)
    end

    local size_min = CalcWindowMinSize(window)
    return ImMax(new_size, size_min)
end

--- @param window               ImGuiWindow
--- @param content_size_current ImVec2
--- @param content_size_ideal   ImVec2
local function CalcWindowContentSizes(window, content_size_current, content_size_ideal)
    local preserve_old_content_sizes = false
    if (window.Collapsed and window.AutoFitFramesX <= 0 and window.AutoFitFramesY <= 0) then
        preserve_old_content_sizes = true
    elseif (window.Hidden and window.HiddenFramesCannotSkipItems == 0 and window.HiddenFramesCanSkipItems > 0) then
        preserve_old_content_sizes = true
    end
    if preserve_old_content_sizes then
        content_size_current.x = window.ContentSize.x
        content_size_current.y = window.ContentSize.y
        content_size_ideal.x = window.ContentSizeIdeal.x
        content_size_ideal.y = window.ContentSizeIdeal.y
        return
    end

    if (window.ContentSizeExplicit.x ~= 0.0) then content_size_current.x = window.ContentSizeExplicit.x else content_size_current.x = ImTrunc64(window.DC.CursorMaxPos.x - window.DC.CursorStartPos.x) end
    if (window.ContentSizeExplicit.y ~= 0.0) then content_size_current.y = window.ContentSizeExplicit.y else content_size_current.y = ImTrunc64(window.DC.CursorMaxPos.y - window.DC.CursorStartPos.y) end
    if (window.ContentSizeExplicit.x ~= 0.0) then content_size_ideal.x = window.ContentSizeExplicit.x else content_size_ideal.x = ImTrunc64(ImMax(window.DC.CursorMaxPos.x, window.DC.IdealMaxPos.x) - window.DC.CursorStartPos.x) end
    if (window.ContentSizeExplicit.y ~= 0.0) then content_size_ideal.y = window.ContentSizeExplicit.y else content_size_ideal.y = ImTrunc64(ImMax(window.DC.CursorMaxPos.y, window.DC.IdealMaxPos.y) - window.DC.CursorStartPos.y) end
end

--- @param window        ImGuiWindow # The window to calculate auto-fit size for
--- @param size_contents ImVec2      # The content size
--- @param axis_mask     int         # The axis mask to determine which axes to auto-fit
--- @return ImVec2                   # The auto-fit size
local function CalcWindowAutoFitSize(window, size_contents, axis_mask)
    local g = GImGui
    local style = g.Style
    local decoration_w_without_scrollbars = window.DecoOuterSizeX1 + window.DecoOuterSizeX2 - window.ScrollbarSizes.x
    local decoration_h_without_scrollbars = window.DecoOuterSizeY1 + window.DecoOuterSizeY2 - window.ScrollbarSizes.y
    local size_pad = ImVec2(window.WindowPadding.x * 2, window.WindowPadding.y * 2)
    local size_desired = ImVec2()
    size_desired.x = (bit32.band(axis_mask, 1) ~= 0) and (size_contents.x + size_pad.x + decoration_w_without_scrollbars) or window.Size.x
    size_desired.y = (bit32.band(axis_mask, 2) ~= 0) and (size_contents.y + size_pad.y + decoration_h_without_scrollbars) or window.Size.y

    local size_max = ImVec2(FLT_MAX, FLT_MAX)
    if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) == 0 or bit32.band(window.Flags, ImGuiWindowFlags.Popup) ~= 0 then
        if not window.ViewportOwned then
            size_max = ImGui.GetMainViewport().WorkSize - style.DisplaySafeAreaPadding * 2.0
        end
        local monitor_idx = window.ViewportAllowPlatformMonitorExtend
        if monitor_idx >= 1 and monitor_idx <= g.PlatformIO.Monitors.Size then
            size_max = g.PlatformIO.Monitors.Data[monitor_idx].WorkSize - style.DisplaySafeAreaPadding * 2.0
        end
    end

    if bit32.band(window.Flags, ImGuiWindowFlags.Tooltip) ~= 0 then
        return ImMin(size_desired, size_max)
    else
        local size_min = CalcWindowMinSize(window)
        local size_auto_fit = ImClamp(size_desired, ImMin(size_min, size_max), size_max)

        local size_auto_fit_after_constraint = CalcWindowSizeAfterConstraint(window, size_auto_fit)
        local size_contents_for_scrollbar_x = (bit32.band(axis_mask, 1) ~= 0) and size_contents.x or window.ContentSize.x
        local size_contents_for_scrollbar_y = (bit32.band(axis_mask, 2) ~= 0) and size_contents.y or window.ContentSize.y
        local will_have_scrollbar_x = (size_auto_fit_after_constraint.x < size_contents_for_scrollbar_x + size_pad.x + decoration_w_without_scrollbars and bit32.band(window.Flags, ImGuiWindowFlags.NoScrollbar) == 0 and bit32.band(window.Flags, ImGuiWindowFlags.HorizontalScrollbar) ~= 0) or bit32.band(window.Flags, ImGuiWindowFlags.AlwaysHorizontalScrollbar) ~= 0
        local will_have_scrollbar_y = (size_auto_fit_after_constraint.y < size_contents_for_scrollbar_y + size_pad.y + decoration_h_without_scrollbars and bit32.band(window.Flags, ImGuiWindowFlags.NoScrollbar) == 0) or bit32.band(window.Flags, ImGuiWindowFlags.AlwaysVerticalScrollbar) ~= 0
        if will_have_scrollbar_x then
            size_auto_fit.y = size_auto_fit.y + style.ScrollbarSize
        end
        if will_have_scrollbar_y then
            size_auto_fit.x = size_auto_fit.x + style.ScrollbarSize
        end
        return size_auto_fit
    end
end

--- @param window ImGuiWindow
--- @return ImVec2
function ImGui.CalcWindowNextAutoFitSize(window)
    local size_contents_current = ImVec2()
    local size_contents_ideal = ImVec2()
    CalcWindowContentSizes(window, size_contents_current, size_contents_ideal)
    local size_auto_fit = CalcWindowAutoFitSize(window, size_contents_ideal, -1)
    local size_final = CalcWindowSizeAfterConstraint(window, size_auto_fit)
    return size_final
end

--- @param window ImGuiWindow
--- @return ImGuiCol
local function GetWindowBgColorIdx(window)
    if bit32.band(window.Flags, bit32.bor(ImGuiWindowFlags.Tooltip, ImGuiWindowFlags.Popup)) ~= 0 then
        return ImGuiCol.PopupBg
    elseif bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 and not window.DockIsActive then
        return ImGuiCol.ChildBg
    else
        return ImGuiCol.WindowBg
    end
end

--- @param window            ImGuiWindow
--- @param corner_target_arg ImVec2
--- @param corner_norm       ImVec2
--- @return ImVec2, ImVec2
--- @nodiscard
local function CalcResizePosSizeFromAnyCorner(window, corner_target_arg, corner_norm)
    local corner_target = ImVec2()
    ImVec2_Copy(corner_target, corner_target_arg)

    if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
        local parent_window = window.ParentWindow
        local parent_flags = parent_window.Flags

        local limit_rect = ImRect()
        ImRect_Copy(limit_rect, parent_window.InnerRect)
        limit_rect:Expand(ImVec2(-ImMax(parent_window.WindowPadding.x, parent_window.WindowBorderSize), -ImMax(parent_window.WindowPadding.y, parent_window.WindowBorderSize)))

        if (bit32.band(parent_flags, bit32.bor(ImGuiWindowFlags.HorizontalScrollbar, ImGuiWindowFlags.AlwaysHorizontalScrollbar)) == 0) or (bit32.band(parent_flags, ImGuiWindowFlags.NoScrollbar) ~= 0) then
            corner_target.x = ImClamp(corner_target.x, limit_rect.Min.x, limit_rect.Max.x)
        end
        if bit32.band(parent_flags, ImGuiWindowFlags.NoScrollbar) ~= 0 then
            corner_target.y = ImClamp(corner_target.y, limit_rect.Min.y, limit_rect.Max.y)
        end
    end
    local pos_min = ImLerp(corner_target, window.Pos, corner_norm)
    local pos_max = ImLerp(window.Pos + window.Size, corner_target, corner_norm)
    local size_expected = pos_max - pos_min
    local size_constrained = CalcWindowSizeAfterConstraint(window, size_expected)

    local out_pos = pos_min
    if corner_norm.x == 0.0 then
        out_pos.x = out_pos.x - (size_constrained.x - size_expected.x)
    end
    if corner_norm.y == 0.0 then
        out_pos.y = out_pos.y - (size_constrained.y - size_expected.y)
    end

    return out_pos, size_constrained
end

--- @param window            ImGuiWindow
--- @param resize_grip_count int
--- @param resize_grip_col   table
--- @param visibility_rect   ImRect
--- @return int, int, int
local function UpdateWindowManualResize(window, resize_grip_count, resize_grip_col, visibility_rect)
    local g = GImGui
    local flags = window.Flags

    if (bit32.band(flags, ImGuiWindowFlags.NoResize) ~= 0 or window.AutoFitFramesX > 0 or window.AutoFitFramesY > 0) then
        return 0, -1, -1
    end
    if (bit32.band(flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0 and bit32.band(window.ChildFlags, bit32.bor(ImGuiChildFlags.ResizeX, ImGuiChildFlags.ResizeY)) == 0) then
        return 0, -1, -1
    end
    if window.WasActive == false then
        return 0, -1, -1
    end

    local border_hovered = -1
    local border_held = -1

    local ret_auto_fit_mask = 0x00
    local grip_draw_size = IM_TRUNC(ImMax(g.FontSize * 1.35, g.Style.WindowRounding + 1.0 + g.FontSize * 0.2))
    local grip_hover_inner_size = (resize_grip_count > 0) and IM_TRUNC(grip_draw_size * 0.75) or 0.0
    local grip_hover_outer_size = g.WindowsBorderHoverPadding + 1

    ImGui.PushID("#RESIZE")

    local pos_target = ImVec2(FLT_MAX, FLT_MAX)
    local size_target = ImVec2(FLT_MAX, FLT_MAX)

    -- Clip mouse interaction rectangles within the viewport rectangle (in practice the narrowing is going to happen most of the time).
    -- - Not narrowing would mostly benefit the situation where OS windows _without_ decoration have a threshold for hovering when outside their limits.
    --   This is however not the case with current backends under Win32, but a custom borderless window implementation would benefit from it.
    -- - When decoration are enabled we typically benefit from that distance, but then our resize elements would be conflicting with OS resize elements, so we also narrow.
    -- - Note that we are unable to tell if the platform setup allows hovering with a distance threshold (on Win32, decorated window have such threshold).
    -- We only clip interaction so we overwrite window->ClipRect, cannot call PushClipRect() yet as DrawList is not yet setup.
    local clip_with_viewport_rect = bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.HasMouseHoveredViewport) == 0 or g.IO.MouseHoveredViewport ~= window.ViewportId or bit32.band(window.Viewport.Flags, ImGuiViewportFlags.NoDecoration) == 0
    if (clip_with_viewport_rect) then
        ImRect_Copy(window.ClipRect, window.Viewport:GetMainRect())
    end

    local clamp_rect = ImRect()
    ImRect_Copy(clamp_rect, visibility_rect)

    local window_move_from_title_bar = (bit32.band(window.BgClickFlags, ImGuiWindowBgClickFlags.Move) == 0) and (bit32.band(window.Flags, ImGuiWindowFlags.NoTitleBar) == 0)
    if window_move_from_title_bar then
        clamp_rect.Min.y = clamp_rect.Min.y - window.TitleBarHeight
    end

    for resize_grip_n = 0, resize_grip_count - 1 do
        local def = ImGuiResizeGripDef[resize_grip_n + 1]
        local corner_pos = def.CornerPosN
        local inner_dir = def.InnerDir

        local corner = ImVec2(window.Pos.x + corner_pos.x * window.Size.x, window.Pos.y + corner_pos.y * window.Size.y)

        local resize_rect = ImRect(corner - inner_dir * grip_hover_outer_size, corner + inner_dir * grip_hover_inner_size)

        if resize_rect.Min.x > resize_rect.Max.x then resize_rect.Min.x, resize_rect.Max.x = resize_rect.Max.x, resize_rect.Min.x end
        if resize_rect.Min.y > resize_rect.Max.y then resize_rect.Min.y, resize_rect.Max.y = resize_rect.Max.y, resize_rect.Min.y end

        local resize_grip_id = window:GetID(resize_grip_n)

        ImGui.ItemAdd(resize_rect, resize_grip_id, nil, ImGuiItemFlags.NoNav)
        local _, hovered, held = ImGui.ButtonBehavior(resize_rect, resize_grip_id, bit32.bor(ImGuiButtonFlags.FlattenChildren, ImGuiButtonFlags.NoNavFocus))

        if hovered or held then
            ImGui.SetMouseCursor((bit32.band(resize_grip_n, 1) ~= 0) and ImGuiMouseCursor.ResizeNESW or ImGuiMouseCursor.ResizeNWSE)
        end

        if held and g.IO.MouseDoubleClicked[0] then
            local size_auto_fit = CalcWindowAutoFitSize(window, window.ContentSizeIdeal, -1)
            size_target = CalcWindowSizeAfterConstraint(window, size_auto_fit)
            ret_auto_fit_mask = 0x03
            ImGui.ClearActiveID()
        elseif held then
            local clamp_min = ImVec2((corner_pos.x == 1.0) and clamp_rect.Min.x or -FLT_MAX, (corner_pos.y == 1.0) and clamp_rect.Min.y or -FLT_MAX)
            local clamp_max = ImVec2((corner_pos.x == 0.0) and clamp_rect.Max.x or FLT_MAX, (corner_pos.y == 0.0) and clamp_rect.Max.y or FLT_MAX)
            local corner_target = g.IO.MousePos - g.ActiveIdClickOffset + ImLerp(def.InnerDir * grip_hover_outer_size, def.InnerDir * -grip_hover_inner_size, def.CornerPosN)

            corner_target = ImClamp(corner_target, clamp_min, clamp_max)

            pos_target, size_target = CalcResizePosSizeFromAnyCorner(window, corner_target, corner_pos)
        end

        local resize_grip_visible = held or hovered or (resize_grip_n == 0 and bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) == 0)
        if resize_grip_visible then
            local color
            if held then
                color = ImGui.GetColorU32(ImGuiCol.ResizeGripActive)
            else
                if hovered then
                    color = ImGui.GetColorU32(ImGuiCol.ResizeGripHovered)
                else
                    color = ImGui.GetColorU32(ImGuiCol.ResizeGrip)
                end
            end
            resize_grip_col[resize_grip_n + 1] = color
        end
    end

    local resize_border_mask = 0x00
    if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
        local mask_x = (bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeX) ~= 0) and 0x02 or 0
        local mask_y = (bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeY) ~= 0) and 0x08 or 0
        resize_border_mask = bit32.bor(mask_x, mask_y)
    else
        resize_border_mask = g.IO.ConfigWindowsResizeFromEdges and 0x0F or 0x00
    end

    for border_n = 0, 3 do
        repeat
        if bit32.band(resize_border_mask, bit32.lshift(1, border_n)) == 0 then
            break
        end

        local def = ImGuiResizeBorderDef[border_n + 1]
        local axis
        if border_n == ImGuiDir.Left or border_n == ImGuiDir.Right then
            axis = ImGuiAxis.X
        else
            axis = ImGuiAxis.Y
        end

        local border_rect = GetResizeBorderRect(window, border_n, grip_hover_inner_size, g.WindowsBorderHoverPadding)
        local border_id = window:GetID(border_n + 4)
        ImGui.ItemAdd(border_rect, border_id, nil, ImGuiItemFlags.NoNav)
        local _, hovered, held = ImGui.ButtonBehavior(border_rect, border_id, bit32.bor(ImGuiButtonFlags.FlattenChildren, ImGuiButtonFlags.NoNavFocus))

        if hovered and g.HoveredIdTimer <= WINDOWS_RESIZE_FROM_EDGES_FEEDBACK_TIMER then
            hovered = false
        end
        if hovered or held then
            ImGui.SetMouseCursor((axis == ImGuiAxis.X) and ImGuiMouseCursor.ResizeEW or ImGuiMouseCursor.ResizeNS)
        end
        if held and g.IO.MouseDoubleClicked[0] then
            -- Double-clicking bottom or right border auto-fit on this axis
            -- FIXME: Support top and right borders: rework CalcResizePosSizeFromAnyCorner() to be reusable in both cases.
            if border_n == 1 or border_n == 3 then -- Right and bottom border
                local size_auto_fit = CalcWindowAutoFitSize(window, window.ContentSizeIdeal, bit32.lshift(1, axis - 1))
                size_target[axis] = CalcWindowSizeAfterConstraint(window, size_auto_fit)[axis]
                ret_auto_fit_mask = bit32.bor(ret_auto_fit_mask, bit32.lshift(1, axis - 1))
                hovered = false
                held = false -- So border doesn't show highlighted at new position
            end
            ImGui.ClearActiveID()
        elseif held then
            local just_scrolled_manually_while_resizing = (g.WheelingWindow ~= nil and g.WheelingWindowScrolledFrame == g.FrameCount and ImGui.IsWindowChildOf(window, g.WheelingWindow, false, true))
            if g.ActiveIdIsJustActivated or just_scrolled_manually_while_resizing then
                g.WindowResizeBorderExpectedRect = border_rect
                g.WindowResizeRelativeMode = false
            end

            if (bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0) and g.WindowResizeBorderExpectedRect ~= border_rect then
                g.WindowResizeRelativeMode = true
            end

            local border_curr = window.Pos + ImMin(def.SegmentN1, def.SegmentN2) * window.Size
            local border_target_rel_mode_for_axis
            local border_target_abs_mode_for_axis
            border_target_rel_mode_for_axis = border_curr[axis] + g.IO.MouseDelta[axis]
            border_target_abs_mode_for_axis = g.IO.MousePos[axis] - g.ActiveIdClickOffset[axis] + g.WindowsBorderHoverPadding -- Match ButtonBehavior() padding above

            -- Use absolute mode position
            local border_target = ImVec2()
            ImVec2_Copy(border_target, window.Pos)
            border_target[axis] = border_target_abs_mode_for_axis

            -- Use relative mode target for child window, ignore resize when moving back toward the ideal absolute position.
            local ignore_resize = false
            if g.WindowResizeRelativeMode then
                border_target[axis] = border_target_rel_mode_for_axis
                if g.IO.MouseDelta[axis] == 0.0 or ((g.IO.MouseDelta[axis] > 0.0) == (border_target_rel_mode_for_axis > border_target_abs_mode_for_axis)) then
                    ignore_resize = true
                end
            end

            local clamp_min = ImVec2((border_n == ImGuiDir.Right) and clamp_rect.Min.x or -FLT_MAX, (border_n == ImGuiDir.Down or (border_n == ImGuiDir.Up and window_move_from_title_bar)) and clamp_rect.Min.y or -FLT_MAX)
            local clamp_max = ImVec2((border_n == ImGuiDir.Left) and clamp_rect.Max.x or FLT_MAX, (border_n == ImGuiDir.Up) and clamp_rect.Max.y or FLT_MAX)
            border_target = ImClamp(border_target, clamp_min, clamp_max)

            if not ignore_resize then
                pos_target, size_target = CalcResizePosSizeFromAnyCorner(window, border_target, ImMin(def.SegmentN1, def.SegmentN2))
            end
        end
        if hovered then
            border_hovered = border_n
        end
        if held then
            border_held = border_n
        end

        until true
    end
    ImGui.PopID()

    window.DC.NavLayerCurrent = ImGuiNavLayer.Main

    if size_target.x ~= FLT_MAX and (window.Size.x ~= size_target.x or window.SizeFull.x ~= size_target.x) then
        window.Size.x = size_target.x
        window.SizeFull.x = size_target.x
    end

    if size_target.y ~= FLT_MAX and (window.Size.y ~= size_target.y or window.SizeFull.y ~= size_target.y) then
        window.Size.y = size_target.y
        window.SizeFull.y = size_target.y
    end

    if pos_target.x ~= FLT_MAX and window.Pos.x ~= ImFloor(pos_target.x) then
        window.Pos.x = ImFloor(pos_target.x)
    end

    if pos_target.y ~= FLT_MAX and window.Pos.y ~= ImFloor(pos_target.y) then
        window.Pos.y = ImFloor(pos_target.y)
    end

    if border_held ~= -1 then
        g.WindowResizeBorderExpectedRect = GetResizeBorderRect(window, border_held, grip_hover_inner_size, g.WindowsBorderHoverPadding)
    end

    return ret_auto_fit_mask, border_hovered, border_held
end

--- @param pos        ImVec2
--- @param wrap_pos_x float
--- @return float
function ImGui.CalcWrapWidthForPos(pos, wrap_pos_x)
    if wrap_pos_x < 0.0 then
        return 0.0
    end

    local g = GImGui
    local window = g.CurrentWindow
    if wrap_pos_x == 0.0 then
        wrap_pos_x = window.WorkRect.Max.x
    elseif wrap_pos_x > 0.0 then
        wrap_pos_x = wrap_pos_x + window.Pos.x - window.Scroll.x
    end

    return ImMax(wrap_pos_x - pos.x, 1.0)
end

--- @param text     ImString
--- @param text_end int?
--- @return int # Exclusive upper bound
function ImGui.FindRenderedTextEnd(text, text_end)
    local text_display_end = 1
    local text_len = #text
    if not text_end then
        text_end = text_len + 1
    end

    text_display_end = ImMemchr(text, "##", 1) or text_end
    text_display_end = ImMin(text_display_end, text_end)

    return text_display_end
end

--- @param pos                  ImVec2
--- @param text                 string
--- @param text_begin           int?
--- @param text_end             int?
--- @param hide_text_after_hash bool?  # true by default
function ImGui.RenderText(pos, text, text_begin, text_end, hide_text_after_hash)
    if text_begin           == nil then text_begin = 1 end
    if hide_text_after_hash == nil then hide_text_after_hash = true end

    local g = GImGui
    local window = g.CurrentWindow

    -- Hide anything after a '##' string
    local text_display_end
    if hide_text_after_hash then
        text_display_end = ImGui.FindRenderedTextEnd(text, text_end)
    else
        if text_end == nil then
            text_end = #text + 1
        end
        text_display_end = text_end
    end

    if text ~= "" and text_display_end > 1 then
        window.DrawList:AddText(g.Font, g.FontSize, pos, ImGui.GetColorU32(ImGuiCol.Text), text, text_begin, text_display_end, 0.0)
        if g.LogEnabled then
            -- ImGui.LogRenderedText(&pos, text, text_display_end);
        end
    end
end

--- @param pos        ImVec2
--- @param text       string
--- @param text_end   int?
--- @param wrap_width float
function ImGui.RenderTextWrapped(pos, text, text_end, wrap_width)
    local g = GImGui
    local window = g.CurrentWindow

    if text_end == nil then
        text_end = #text + 1
    end

    if text ~= "" then
        window.DrawList:AddText(g.Font, g.FontSize, pos, ImGui.GetColorU32(ImGuiCol.Text), text, 1, text_end, wrap_width)
    end
end

--- @param draw_list           ImDrawList
--- @param pos_min             ImVec2
--- @param pos_max             ImVec2
--- @param text                string
--- @param text_begin          int
--- @param text_display_end    int
--- @param text_size_if_known? ImVec2
--- @param align?              ImVec2
--- @param clip_rect?          ImRect
function ImGui.RenderTextClippedEx(draw_list, pos_min, pos_max, text, text_begin, text_display_end, text_size_if_known, align, clip_rect)
    if not align then align = ImVec2(0, 0) end

    local pos = ImVec2()
    ImVec2_Copy(pos, pos_min)

    local text_size = text_size_if_known or ImGui.CalcTextSize(text, text_display_end, false, 0.0)

    local clip_min = clip_rect and clip_rect.Min or pos_min
    local clip_max = clip_rect and clip_rect.Max or pos_max
    local need_clipping = (pos.x + text_size.x >= clip_max.x) or (pos.y + text_size.y >= clip_max.y)
    if (clip_rect) then
        need_clipping = need_clipping or ((pos.x < clip_min.x) or (pos.y < clip_min.y))
    end

    if (align.x > 0.0) then pos.x = ImMax(pos.x, pos.x + (pos_max.x - pos.x - text_size.x) * align.x) end
    if (align.y > 0.0) then pos.y = ImMax(pos.y, pos.y + (pos_max.y - pos.y - text_size.y) * align.y) end

    local g = GImGui
    if (need_clipping) then
        local fine_clip_rect = ImVec4(clip_min.x, clip_min.y, clip_max.x, clip_max.y)
        draw_list:AddText(nil, 0.0, pos, ImGui.GetColorU32(ImGuiCol.Text), text, text_begin, text_display_end, 0.0, fine_clip_rect)
    else
        draw_list:AddText(nil, 0.0, pos, ImGui.GetColorU32(ImGuiCol.Text), text, text_begin, text_display_end, 0.0, nil)
    end
end

--- @param pos_min             ImVec2
--- @param pos_max             ImVec2
--- @param text                string
--- @param text_end?           int
--- @param text_size_if_known? ImVec2
--- @param align?              ImVec2
--- @param clip_rect?          ImRect
function ImGui.RenderTextClipped(pos_min, pos_max, text, text_end, text_size_if_known, align, clip_rect)
    if not align then align = ImVec2(0, 0) end

    local text_display_end = ImGui.FindRenderedTextEnd(text, text_end)
    local text_len = text_display_end - 1

    if text_len == 0 then
        return
    end

    local g = GImGui
    local window = g.CurrentWindow
    ImGui.RenderTextClippedEx(window.DrawList, pos_min, pos_max, text, 1, text_display_end, text_size_if_known, align, clip_rect)
    -- if (g.LogEnabled)
    --     ImGui.LogRenderedText(&pos_min, text, text_display_end);
end

--- @param bb        ImRect
--- @param id        ImGuiID
--- @param flags?    ImGuiNavRenderCursorFlags
--- @param rounding? float
function ImGui.RenderNavCursor(bb, id, flags, rounding)
    if flags    == nil then flags    = ImGuiNavRenderCursorFlags.None end
    if rounding == nil then rounding = -1.0 end

    local g = GImGui
    if id ~= g.NavId then
        return
    end
    if not g.NavCursorVisible and bit32.band(flags, ImGuiNavRenderCursorFlags.AlwaysDraw) == 0 then
        return
    end
    if id == g.LastItemData.ID and bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.NoNav) ~= 0 then
        return
    end

    local window = g.CurrentWindow
    if window.DC.NavHideHighlightOneFrame then
        return
    end

    if rounding < 0.0 then
        rounding = g.Style.FrameRounding
    end

    local display_rect = ImRect()
    ImRect_Copy(display_rect, bb)
    display_rect:ClipWith(window.ClipRect)
    local scale_factor = ImGui.GetScale()
    local thickness = ImTrunc(ImMax(2.0, 1.5 * scale_factor))
    if bit32.band(flags, ImGuiNavRenderCursorFlags.Compact) ~= 0 then
        window.DrawList:AddRect(display_rect.Min, display_rect.Max, ImGui.GetColorU32(ImGuiCol.NavCursor), rounding, thickness)
    else
        local distance = ImTrunc(3.0 + thickness * 0.5)
        display_rect:Expand(ImVec2(distance, distance))
        local fully_visible = window.ClipRect:Contains(display_rect)
        if not fully_visible then
            window.DrawList:PushClipRect(display_rect.Min, display_rect.Max)
        end
        window.DrawList:AddRect(display_rect.Min, display_rect.Max, ImGui.GetColorU32(ImGuiCol.NavCursor), rounding, thickness)
        if not fully_visible then
            window.DrawList:PopClipRect()
        end
    end
end

do --[[ImGui.RenderMouseCursor]]

local offset = ImVec2()
local size   = ImVec2()
local uv_border = {ImVec2(), ImVec2()}
local uv_fill   = {ImVec2(), ImVec2()}

--- @param base_pos     ImVec2
--- @param base_scale   float
--- @param mouse_cursor ImGuiMouseCursor
--- @param col_fill     ImU32
--- @param col_border   ImU32
--- @param col_shadow   ImU32
function ImGui.RenderMouseCursor(base_pos, base_scale, mouse_cursor, col_fill, col_border, col_shadow)
    local g = GImGui
    if mouse_cursor <= ImGuiMouseCursor.None or mouse_cursor >= ImGuiMouseCursor.COUNT then -- We intentionally accept out of bound values
        mouse_cursor = ImGuiMouseCursor.Arrow
    end
    local font_atlas = g.DrawListSharedData.FontAtlas

    for _, viewport in g.Viewports:iter() do
        repeat
        if not ImFontAtlasGetMouseCursorTexData(font_atlas, mouse_cursor, offset, size, uv_border, uv_fill) then
            break
        end

        local pos = base_pos - offset
        local scale = base_scale * viewport.DpiScale
        if not viewport:GetMainRect():Overlaps(ImRect(pos, pos + ImVec2(size.x + 2, size.y + 2) * scale)) then
            break
        end

        local draw_list = ImGui.GetForegroundDrawList(viewport)
        local tex_ref = font_atlas.TexRef
        draw_list:PushTexture(tex_ref);
        draw_list:AddImage(tex_ref, pos + ImVec2(1, 0) * scale, pos + (ImVec2(1, 0) + size) * scale, uv_fill[1], uv_fill[2], col_shadow)
        draw_list:AddImage(tex_ref, pos + ImVec2(2, 0) * scale, pos + (ImVec2(2, 0) + size) * scale, uv_fill[1], uv_fill[2], col_shadow)
        draw_list:AddImage(tex_ref, pos,                        pos + size * scale,                  uv_fill[1], uv_fill[2], col_border)
        draw_list:AddImage(tex_ref, pos,                        pos + size * scale,                  uv_border[1], uv_border[2], col_fill)
        if mouse_cursor == ImGuiMouseCursor.Wait or mouse_cursor == ImGuiMouseCursor.Progress then
            local a_min = ImFmod(g.Time * 5.0, 2.0 * IM_PI)
            local a_max = a_min + IM_PI * 1.65
            draw_list:PathArcTo(pos + ImVec2(14, -1) * scale, 6.0 * scale, a_min, a_max)
            draw_list:PathStroke(col_fill, 3.0 * scale)
        end
        draw_list:PopTexture()

        until true
    end
end

end

--- Another overly complex function until we reorganize everything into a nice all-in-one helper.
--- This is made more complex because we have dissociated the layout rectangle (pos_min .. pos_max) from 'ellipsis_max_x' which may be beyond it.
--- This is because in the context of tabs we selectively hide part of the text when the Close Button appears, but we don't want the ellipsis to move.
--- @param draw_list           ImDrawList
--- @param pos_min             ImVec2
--- @param pos_max             ImVec2
--- @param ellipsis_max_x      float
--- @param text                string
--- @param text_end_full?      int
--- @param text_size_if_known? ImVec2
function ImGui.RenderTextEllipsis(draw_list, pos_min, pos_max, ellipsis_max_x, text, text_end_full, text_size_if_known)
    local g = GImGui

    if text_end_full == nil then
        text_end_full = ImGui.FindRenderedTextEnd(text)
    end

    local text_size
    if text_size_if_known then
        text_size = ImVec2()
        ImVec2_Copy(text_size, text_size_if_known)
    else
        text_size = ImGui.CalcTextSize(text, text_end_full, false, 0.0)
    end

    -- draw_list:AddLine(ImVec2(pos_max.x, pos_min.y - 4), ImVec2(pos_max.x, pos_max.y + 6), IM_COL32(0, 0, 255, 255))
    -- draw_list:AddLine(ImVec2(ellipsis_max_x, pos_min.y - 2), ImVec2(ellipsis_max_x, pos_max.y + 3), IM_COL32(0, 255, 0, 255))

    -- FIXME: We could technically remove (last_glyph->AdvanceX - last_glyph->X1) from text_size.x here and save a few pixels.
    if text_size.x > pos_max.x - pos_min.x then
        -- Hello wo...
        -- |       |   |
        -- min   max   ellipsis_max
        --          <-> this is generally some padding value

        local font = draw_list._Data.Font
        local font_size = draw_list._Data.FontSize
        local font_scale = draw_list._Data.FontScale
        local text_end_ellipsis = nil
        local baked = font:GetFontBaked(font_size)
        local ellipsis_width = baked:GetCharAdvance(font.EllipsisChar) * font_scale

        -- We can now claim the space between pos_max.x and ellipsis_max.x
        local text_avail_width = ImMax((ImMax(pos_max.x, ellipsis_max_x) - ellipsis_width) - pos_min.x, 1.0)
        local text_size_clipped
        text_size_clipped, text_end_ellipsis = font:CalcTextSizeA(font_size, text_avail_width, 0.0, text, 1, text_end_full)
        local text_size_clipped_x = text_size_clipped.x

        -- Render text, render ellipsis
        ImGui.RenderTextClippedEx(draw_list, pos_min, pos_max, text, 1, text_end_ellipsis, text_size, ImVec2(0.0, 0.0))
        local cpu_fine_clip_rect = ImVec4(pos_min.x, pos_min.y, pos_max.x, pos_max.y)
        local ellipsis_pos = ImTrunc(ImVec2(pos_min.x + text_size_clipped_x, pos_min.y))
        font:RenderChar(draw_list, font_size, ellipsis_pos, ImGui.GetColorU32(ImGuiCol.Text), font.EllipsisChar, cpu_fine_clip_rect)
    else
        ImGui.RenderTextClippedEx(draw_list, pos_min, pos_max, text, 1, text_end_full, text_size, ImVec2(0.0, 0.0))
    end

    if g.LogEnabled then
        ImGui.LogRenderedText(pos_min, text, text_end_full)
    end
end

--- @param p_min     ImVec2
--- @param p_max     ImVec2
--- @param fill_col  ImU32
--- @param borders?  bool
--- @param rounding? float
function ImGui.RenderFrame(p_min, p_max, fill_col, borders, rounding)
    if borders  == nil then borders  = true end
    if rounding == nil then rounding = 0.0 end

    local g = GImGui
    local window = g.CurrentWindow

    window.DrawList:AddRectFilled(p_min, p_max, fill_col, rounding)

    local border_size = g.Style.FrameBorderSize
    if borders and border_size > 0 then
        window.DrawList:AddRect(p_min + ImVec2(1, 1), p_max + ImVec2(1, 1), ImGui.GetColorU32(ImGuiCol.BorderShadow), rounding, border_size, 0)
        window.DrawList:AddRect(p_min, p_max, ImGui.GetColorU32(ImGuiCol.Border), rounding, border_size, 0)
    end
end

--- @param p_min    ImVec2
--- @param p_max    ImVec2
--- @param rounding float
function ImGui.RenderFrameBorder(p_min, p_max, rounding)
    local g = GImGui
    local window = g.CurrentWindow
    local border_size = g.Style.FrameBorderSize
    if border_size > 0.0 then
        window.DrawList:AddRect(p_min + ImVec2(1, 1), p_max + ImVec2(1, 1), ImGui.GetColorU32(ImGuiCol.BorderShadow), rounding, border_size, 0)
        window.DrawList:AddRect(p_min, p_max, ImGui.GetColorU32(ImGuiCol.Border), rounding, border_size, 0)
    end
end

--- @param bb       ImRect
--- @param col      ImU32
--- @param rounding float
function ImGui.RenderColorComponentMarker(bb, col, rounding)
    if bb.Min.x + 1 >= bb.Max.x then
        return
    end
    local g = GImGui
    local window = g.CurrentWindow
    ImGui.RenderRectFilledInRangeH(window.DrawList, bb, col, bb.Min.x, ImMin(bb.Min.x + g.Style.ColorMarkerSize, bb.Max.x), rounding)
end

--- @param window      ImGuiWindow
--- @param border_n    int
--- @param border_col  ImU32
--- @param border_size float
local function RenderWindowOuterSingleBorder(window, border_n, border_col, border_size)
    local def = ImGuiResizeBorderDef[border_n + 1]
    local rounding = window.WindowRounding
    local border_r = GetResizeBorderRect(window, border_n, rounding, 0.0)
    window.DrawList:PathArcTo(ImLerp(border_r.Min, border_r.Max, def.SegmentN1) + ImVec2(0.5, 0.5) + def.InnerDir * rounding, rounding, def.OuterAngle - IM_PI * 0.25, def.OuterAngle)
    window.DrawList:PathArcTo(ImLerp(border_r.Min, border_r.Max, def.SegmentN2) + ImVec2(0.5, 0.5) + def.InnerDir * rounding, rounding, def.OuterAngle, def.OuterAngle + IM_PI * 0.25)
    window.DrawList:PathStroke(border_col, border_size)
end

local function RenderWindowOuterBorders(window)
    local g = GImGui
    local border_size = window.WindowBorderSize
    local border_col = ImGui.GetColorU32(ImGuiCol.Border)
    if border_size > 0.0 and (bit32.band(window.Flags, ImGuiWindowFlags.NoBackground) == 0) then
        window.DrawList:AddRect(window.Pos, window.Pos + window.Size, border_col, window.WindowRounding, window.WindowBorderSize, 0)
    elseif border_size > 0.0 then
        if bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeX) ~= 0 then
            RenderWindowOuterSingleBorder(window, 1, border_col, border_size)
        end
        if bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeY) ~= 0 then
            RenderWindowOuterSingleBorder(window, 3, border_col, border_size)
        end
    end

    if window.ResizeBorderHovered ~= -1 or window.ResizeBorderHeld ~= -1 then
        local border_n = (window.ResizeBorderHeld ~= -1) and window.ResizeBorderHeld or window.ResizeBorderHovered
        local border_col_resizing = ImGui.GetColorU32((window.ResizeBorderHeld ~= -1) and ImGuiCol.SeparatorActive or ImGuiCol.SeparatorHovered)
        RenderWindowOuterSingleBorder(window, border_n, border_col_resizing, ImMax(2.0, window.WindowBorderSize))
    end

    if g.Style.FrameBorderSize > 0 and (bit32.band(window.Flags, ImGuiWindowFlags.NoTitleBar) == 0) and not window.DockIsActive then
        local y = window.Pos.y + window.TitleBarHeight - 1
        window.DrawList:AddLineH(window.Pos.x + border_size * 0.5, window.Pos.x + window.Size.x - border_size * 0.5, y, border_col, g.Style.FrameBorderSize)
    end
end

--- @param window                          ImGuiWindow
--- @param title_bar_rect                  ImRect
--- @param title_bar_is_highlight          bool
--- @param handle_borders_and_resize_grips bool
--- @param resize_grip_col                 ImU32[]
--- @param resize_grip_draw_size           float
local function RenderWindowDecorations(window, title_bar_rect, title_bar_is_highlight, handle_borders_and_resize_grips, resize_grip_col, resize_grip_draw_size)
    local g = GImGui
    local style = g.Style
    local flags = window.Flags

    local window_rounding = window.WindowRounding
    local window_border_size = window.WindowBorderSize

    if window.Collapsed then
        local backup_border_size = style.FrameBorderSize
        g.Style.FrameBorderSize = window.WindowBorderSize

        local title_bar_col = ImGui.GetColorU32((title_bar_is_highlight and g.NavCursorVisible) and ImGuiCol.TitleBgActive or ImGuiCol.TitleBgCollapsed)
        ImGui.RenderFrame(title_bar_rect.Min, title_bar_rect.Max, title_bar_col, true, window_rounding)
        g.Style.FrameBorderSize = backup_border_size
    else
        -- Window background
        if bit32.band(flags, ImGuiWindowFlags.NoBackground) == 0 then
            local bg_col = ImGui.GetColorU32(GetWindowBgColorIdx(window))
            local override_alpha = false
            local alpha = 1.0

            if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasBgAlpha) ~= 0 then
                alpha = g.NextWindowData.BgAlphaVal
                override_alpha = true
            end

            if override_alpha then
                bg_col = bit32.band(bg_col, bit32.bnot(IM_COL32_A_MASK)) or bit32.lshift(IM_F32_TO_INT8_SAT(alpha), IM_COL32_A_SHIFT)
            end

            if bit32.band(bg_col, IM_COL32_A_MASK) ~= 0 then
                local bg_rect = ImRect(window.Pos + ImVec2(0, window.TitleBarHeight), window.Pos + window.Size)
                local bg_rounding_flags
                if window.DockIsActive then
                    bg_rounding_flags = ImGui.CalcRoundingFlagsForRectInRect(bg_rect, window.DockNode.HostWindow:Rect(), 0.0)
                else
                    bg_rounding_flags = (bit32.band(flags, ImGuiWindowFlags.NoTitleBar) ~= 0) and ImDrawFlags.RoundCornersAll or ImDrawFlags.RoundCornersBottom
                end
                local bg_draw_list = window.DockIsActive and window.DockNode.HostWindow.DrawList or window.DrawList
                if window.DockIsActive then bg_draw_list:ChannelsSetCurrent(0) end
                bg_draw_list:AddRectFilled(bg_rect.Min, bg_rect.Max, bg_col, window_rounding, bg_rounding_flags)
                if window.DockIsActive then bg_draw_list:ChannelsSetCurrent(1) end
            end
        end
        if window.DockIsActive then window.DockNode.IsBgDrawnThisFrame = true end

        -- Title bar
        if bit32.band(flags, ImGuiWindowFlags.NoTitleBar) == 0 and not window.DockIsActive then
            local title_bar_col = ImGui.GetColorU32(title_bar_is_highlight and ImGuiCol.TitleBgActive or ImGuiCol.TitleBg)
            window.DrawList:AddRectFilled(title_bar_rect.Min, title_bar_rect.Max, title_bar_col, window_rounding, ImDrawFlags.RoundCornersTop)
        end

        -- Menu bar
        if bit32.band(flags, ImGuiWindowFlags.MenuBar) ~= 0 then
            local menu_bar_rect = window:MenuBarRect()
            menu_bar_rect:ClipWith(window:Rect())
            window.DrawList:AddRectFilled(menu_bar_rect.Min, menu_bar_rect.Max, ImGui.GetColorU32(ImGuiCol.MenuBarBg), (bit32.band(flags, ImGuiWindowFlags.NoTitleBar) ~= 0) and window_rounding or 0.0, ImDrawFlags.RoundCornersTop)
            if style.FrameBorderSize > 0.0 and menu_bar_rect.Max.y < window.Pos.y + window.Size.y then
                window.DrawList:AddLineH(menu_bar_rect.Min.x + window_border_size * 0.5, menu_bar_rect.Max.x - window_border_size * 0.5, menu_bar_rect.Max.y, ImGui.GetColorU32(ImGuiCol.Border), style.FrameBorderSize)
            end
        end

        -- Docking: Unhide tab bar (small triangle in the corner), drag from small triangle to quickly undock
        local node = window.DockNode
        if window.DockIsActive and node:IsHiddenTabBar() and not node:IsNoTabBar() then
            local unhide_sz_draw = ImTrunc(g.FontSize * 0.70)
            local unhide_sz_hit = ImTrunc(g.FontSize * 0.55)
            local p = node.Pos
            local r = ImRect(p, p + ImVec2(unhide_sz_hit, unhide_sz_hit))
            local unhide_id = window:GetID("#UNHIDE")
            ImGui.KeepAliveID(unhide_id)
            local pressed, hovered, held = ImGui.ButtonBehavior(r, unhide_id, ImGuiButtonFlags.FlattenChildren)
            if pressed then
                node.WantHiddenTabBarToggle = true
            elseif held and ImGui.IsMouseDragging(0) then
                ImGui.StartMouseMovingWindowOrNode(window, node, true)
            end
            local col = ImGui.GetColorU32(((held and hovered) or (node.IsFocused and not hovered)) and ImGuiCol.ButtonActive or (hovered and ImGuiCol.ButtonHovered or ImGuiCol.Button))
            window.DrawList:AddTriangleFilled(p, p + ImVec2(unhide_sz_draw, 0.0), p + ImVec2(0.0, unhide_sz_draw), col)
        end

        if window.ScrollbarX then
            ImGui.Scrollbar(ImGuiAxis.X)
        end
        if window.ScrollbarY then
            ImGui.Scrollbar(ImGuiAxis.Y)
        end

        -- Resize grip(s)
        if handle_borders_and_resize_grips and (bit32.band(flags, ImGuiWindowFlags.NoResize) == 0) then
            for resize_grip_n = 1, #ImGuiResizeGripDef do
                repeat
                local col = resize_grip_col[resize_grip_n]
                if bit32.band(col, IM_COL32_A_MASK) == 0 then
                    break
                end

                local grip = ImGuiResizeGripDef[resize_grip_n]
                local corner = ImLerp(window.Pos, window.Pos + window.Size, grip.CornerPosN)
                local border_inner = IM_ROUND(window_border_size * 0.5)
                window.DrawList:PathLineTo(corner + grip.InnerDir * ((resize_grip_n % 2 == 0) and ImVec2(border_inner, resize_grip_draw_size) or ImVec2(resize_grip_draw_size, border_inner)))
                window.DrawList:PathLineTo(corner + grip.InnerDir * ((resize_grip_n % 2 == 0) and ImVec2(resize_grip_draw_size, border_inner) or ImVec2(border_inner, resize_grip_draw_size)))
                window.DrawList:PathArcToFast(ImVec2(corner.x + grip.InnerDir.x * (window_rounding + border_inner), corner.y + grip.InnerDir.y * (window_rounding + border_inner)), window_rounding, grip.AngleMin12, grip.AngleMax12)
                window.DrawList:PathFillConvex(col)

                until true
            end
        end

        if handle_borders_and_resize_grips and not window.DockNodeAsHost then
            RenderWindowOuterBorders(window)
        end
    end

    window.DC.NavLayerCurrent = ImGuiNavLayer.Main
end
ImGui.RenderWindowOuterBorders = RenderWindowOuterBorders

--- @param window         ImGuiWindow
--- @param title_bar_rect ImRect
--- @param name           string
--- @param open           bool?
--- @return bool?
local function RenderWindowTitleBarContents(window, title_bar_rect, name, open)
    local g = GImGui
    local style = g.Style
    local flags = window.Flags

    local has_close_button = (open ~= nil)
    local has_collapse_button = bit32.band(flags, ImGuiWindowFlags.NoCollapse) == 0 and (style.WindowMenuButtonPosition ~= ImGuiDir.None)

    local item_flags_backup = g.CurrentItemFlags
    g.CurrentItemFlags = bit32.bor(g.CurrentItemFlags, ImGuiItemFlags.NoNavDefaultFocus)
    window.DC.NavLayerCurrent = ImGuiNavLayer.Menu

    local pad_l = g.Style.FramePadding.x
    local pad_r = g.Style.FramePadding.x
    local button_sz = g.FontSize
    local close_button_pos
    local collapse_button_pos
    if has_close_button then
        close_button_pos = ImVec2(title_bar_rect.Max.x - pad_r - button_sz, title_bar_rect.Min.y + style.FramePadding.y)
        pad_r = pad_r + button_sz + style.ItemInnerSpacing.x
    end
    if has_collapse_button and style.WindowMenuButtonPosition == ImGuiDir.Right then
        collapse_button_pos = ImVec2(title_bar_rect.Max.x - pad_r - button_sz, title_bar_rect.Min.y + style.FramePadding.y)
        pad_r = pad_r + button_sz + style.ItemInnerSpacing.x
    end
    if has_collapse_button and style.WindowMenuButtonPosition == ImGuiDir.Left then
        collapse_button_pos = ImVec2(title_bar_rect.Min.x + pad_l, title_bar_rect.Min.y + style.FramePadding.y)
        pad_l = pad_l + button_sz + style.ItemInnerSpacing.x
    end

    if has_collapse_button then
        if ImGui.CollapseButton(window:GetID("#COLLAPSE"), collapse_button_pos) then
            window.WantCollapseToggle = true -- Defer actual collapsing to next frame as we are too far in the Begin() function
        end
    end

    if has_close_button then
        local backup_item_flags = g.CurrentItemFlags
        g.CurrentItemFlags = bit32.bor(g.CurrentItemFlags, ImGuiItemFlags.NoFocus)
        if ImGui.CloseButton(window:GetID("#CLOSE"), close_button_pos) then
            open = false
        end
        g.CurrentItemFlags = backup_item_flags
    end

    window.DC.NavLayerCurrent = ImGuiNavLayer.Main
    g.CurrentItemFlags = item_flags_backup

    local marker_size_x = (bit32.band(flags, ImGuiWindowFlags.UnsavedDocument) ~= 0) and (button_sz * 0.80) or 0.0
    local text_size = ImGui.CalcTextSize(name, nil, true) + ImVec2(marker_size_x, 0.0)

    if (pad_l > style.FramePadding.x) then
        pad_l = pad_l + g.Style.ItemInnerSpacing.x
    end
    if (pad_r > style.FramePadding.x) then
        pad_r = pad_r + g.Style.ItemInnerSpacing.x
    end
    if (style.WindowTitleAlign.x > 0.0 and style.WindowTitleAlign.x < 1.0) then
        local centerness = ImSaturate(1.0 - ImFabs(style.WindowTitleAlign.x - 0.5) * 2.0)
        local pad_extend = ImMin(ImMax(pad_l, pad_r), title_bar_rect:GetWidth() - pad_l - pad_r - text_size.x)
        pad_l = ImMax(pad_l, pad_extend * centerness)
        pad_r = ImMax(pad_r, pad_extend * centerness)
    end

    local layout_r = ImRect(title_bar_rect.Min.x + pad_l, title_bar_rect.Min.y, title_bar_rect.Max.x - pad_r, title_bar_rect.Max.y)
    local clip_r = ImRect(layout_r.Min.x, layout_r.Min.y, ImMin(layout_r.Max.x + g.Style.ItemInnerSpacing.x, title_bar_rect.Max.x), layout_r.Max.y)

    if bit32.band(flags, ImGuiWindowFlags.UnsavedDocument) ~= 0 then
        local marker_pos = ImVec2()
        marker_pos.x = ImClamp(layout_r.Min.x + (layout_r:GetWidth() - text_size.x) * style.WindowTitleAlign.x + text_size.x, layout_r.Min.x, layout_r.Max.x)
        marker_pos.y = (layout_r.Min.y + layout_r.Max.y) * 0.5
        if marker_pos.x > layout_r.Min.x then
            ImGui.RenderBullet(window.DrawList, marker_pos, ImGui.GetColorU32(ImGuiCol.UnsavedMarker))
            clip_r.Max.x = ImMin(clip_r.Max.x, marker_pos.x - math.floor(marker_size_x * 0.5))
        end
    end

    ImGui.RenderTextClipped(layout_r.Min, layout_r.Max, name, nil, text_size, style.WindowTitleAlign, clip_r)

    return open
end

--- @param window         ImGuiWindow
--- @param flags          ImGuiWindowFlags
--- @param parent_window? ImGuiWindow
function ImGui.UpdateWindowParentAndRootLinks(window, flags, parent_window)
    window.ParentWindow = parent_window
    window.RootWindow = window
    window.RootWindowPopupTree = window
    window.RootWindowDockTree = window
    window.RootWindowForTitleBarHighlight = window
    window.RootWindowForNav = window

    if parent_window and (bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0) and (bit32.band(flags, ImGuiWindowFlags.Tooltip) == 0) then
        window.RootWindowDockTree = parent_window.RootWindowDockTree
        if not window.DockIsActive and (bit32.band(parent_window.Flags, ImGuiWindowFlags.DockNodeHost) == 0) then
            window.RootWindow = parent_window.RootWindow
        end
    end
    if parent_window and (bit32.band(flags, ImGuiWindowFlags.Popup) ~= 0) then
        window.RootWindowPopupTree = parent_window.RootWindowPopupTree
    end
    if parent_window and (bit32.band(flags, ImGuiWindowFlags.Modal) == 0) and (bit32.band(flags, bit32.bor(ImGuiWindowFlags.ChildWindow, ImGuiWindowFlags.Popup, ImGuiWindowFlags.Tooltip)) ~= 0) then
        window.RootWindowForTitleBarHighlight = parent_window.RootWindowForTitleBarHighlight
    end

    while bit32.band(window.RootWindowForNav.ChildFlags, ImGuiChildFlags.NavFlattened) ~= 0 do
        IM_ASSERT(window.RootWindowForNav.ParentWindow ~= nil)
        window.RootWindowForNav = window.RootWindowForNav.ParentWindow
    end
end

-- [EXPERIMENTAL] Called by Begin(). NextWindowData is valid at this point.
-- This is designed as a toy/test-bed for
--- @param window ImGuiWindow
function ImGui.UpdateWindowSkipRefresh(window)
    local g = GImGui
    window.SkipRefresh = false

    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasRefreshPolicy) == 0 then
        return
    end

    if bit32.band(g.NextWindowData.RefreshFlagsVal, ImGuiWindowRefreshFlags.TryToAvoidRefresh) ~= 0 then
        -- FIXME-IDLE: Tests for e.g. mouse clicks or keyboard while focused.
        if window.Appearing then  -- If currently appearing
            return
        end
        if window.Hidden then  -- If was hidden (previous frame)
            return
        end
        if bit32.band(g.NextWindowData.RefreshFlagsVal, ImGuiWindowRefreshFlags.RefreshOnHover) ~= 0 and g.HoveredWindow then
            if window.RootWindow == g.HoveredWindow.RootWindow or ImGui.IsWindowWithinBeginStackOf(g.HoveredWindow.RootWindow, window) then
                return
            end
        end
        if bit32.band(g.NextWindowData.RefreshFlagsVal, ImGuiWindowRefreshFlags.RefreshOnFocus) ~= 0 and g.NavWindow then
            if window.RootWindow == g.NavWindow.RootWindow or ImGui.IsWindowWithinBeginStackOf(g.NavWindow.RootWindow, window) then
                return
            end
        end
        window.DrawList = nil
        window.SkipRefresh = true
    end
end

--- @param window ImGuiWindow
local function SetWindowActiveForSkipRefresh(window)
    window.Active = true
    for _, child in window.DC.ChildWindows:iter() do
        if not child.Hidden then
            child.Active = true
            child.SkipRefresh = true
            SetWindowActiveForSkipRefresh(child)
        end
    end
end

--- @param window ImGuiWindow?
local function SetCurrentWindow(window)
    local g = GImGui
    --- @diagnostic disable-next-line
    g.CurrentWindow = window
    g.CurrentTable = (window and window.DC.CurrentTableIdx ~= -1) and g.Tables:GetByIndex(window.DC.CurrentTableIdx) or nil

    if window then
        if bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.RendererHasTextures) ~= 0 then
            local viewport = window.Viewport
            g.FontRasterizerDensity = (viewport.FramebufferScale.x ~= 0.0) and viewport.FramebufferScale.x or g.IO.DisplayFramebufferScale.x
        end

        local backup_skip_items = window.SkipItems
        window.SkipItems = false
        ImGui.UpdateCurrentFontSize(0.0)
        window.SkipItems = backup_skip_items
        ImGui.NavUpdateCurrentWindowIsScrollPushableX()
    end
end

-- TODO:
function ImGui.GcCompactTransientMiscBuffers()
    local g = GImGui
    g.ItemFlagsStack:clear()
    g.GroupStack:clear()
    g.InputTextLineIndex:clear()
    ImGui.TableGcCompactSettings()
    for _, atlas in g.FontAtlases:iter() do
        atlas:CompactCache()
    end
end

--- @param window ImGuiWindow
function ImGui.GcCompactTransientWindowBuffers(window)
    window.MemoryCompacted = true
    window.MemoryDrawListIdxCapacity = ImMin(math.floor(window.DrawList.IdxBuffer.Size * 1.05), window.DrawList.IdxBuffer.Capacity)
    window.MemoryDrawListVtxCapacity = ImMin(math.floor(window.DrawList.VtxBuffer.Size * 1.05), window.DrawList.VtxBuffer.Capacity)
    window.IDStack:clear()
    window.DrawList:_ClearFreeMemory()
    window.DC.ChildWindows:clear()
    window.DC.ItemWidthStack:clear()
    window.DC.TextWrapPosStack:clear()
end

--- @param window ImGuiWindow
function ImGui.GcAwakeTransientWindowBuffers(window)
    window.MemoryCompacted = false
    window.DrawList.IdxBuffer:reserve(window.MemoryDrawListIdxCapacity)
    window.DrawList.VtxBuffer:reserve(window.MemoryDrawListVtxCapacity)
    window.MemoryDrawListIdxCapacity = 0
    window.MemoryDrawListVtxCapacity = 0
end

function ImGui.GetWindowWidth()
    local window = GImGui.CurrentWindow
    return window.Size.x
end

--- @param window ImGuiWindow
--- @param pos    ImVec2
--- @param cond?  ImGuiCond
function ImGui.SetWindowPos(window, pos, cond)
    -- Overloads: SetWindowPos(pos, cond) / SetWindowPos(name, pos, cond) / SetWindowPos(window, pos, cond)
    if type(window) == "string" then
        window = ImGui.FindWindowByName(window)
        if window == nil then return end
    elseif window.SetWindowPosAllowFlags == nil then
        window, pos, cond = ImGui.GetCurrentWindowRead(), window, pos
    end
    if cond == nil then cond = 0 end

    if (cond ~= 0) and (bit32.band(window.SetWindowPosAllowFlags, cond) == 0) then
        return
    end

    IM_ASSERT(cond == 0 or ImIsPowerOfTwo(cond))
    window.SetWindowPosAllowFlags = bit32.band(window.SetWindowPosAllowFlags, bit32.bnot(bit32.bor(ImGuiCond.Once, ImGuiCond.FirstUseEver, ImGuiCond.Appearing)))
    ImVec2_Copy(window.SetWindowPosVal, ImVec2(FLT_MAX, FLT_MAX))

    local old_pos = ImVec2()
    ImVec2_Copy(old_pos, window.Pos)

    window.Pos.x = ImTrunc(pos.x)
    window.Pos.y = ImTrunc(pos.y)

    local offset = window.Pos - old_pos

    if offset.x == 0 and offset.y == 0 then
        return
    end
    ImGui.MarkIniSettingsDirty(window)

    ImVec2_Copy(window.DC.CursorPos, window.DC.CursorPos + offset)
    ImVec2_Copy(window.DC.CursorMaxPos, window.DC.CursorMaxPos + offset)
    ImVec2_Copy(window.DC.IdealMaxPos, window.DC.IdealMaxPos + offset)
    ImVec2_Copy(window.DC.CursorStartPos, window.DC.CursorStartPos + offset)
end

--- @param window ImGuiWindow
--- @param size   ImVec2
--- @param cond?  ImGuiCond
function ImGui.SetWindowSize(window, size, cond)
    -- Overloads: SetWindowSize(size, cond) / SetWindowSize(name, size, cond) / SetWindowSize(window, size, cond)
    if type(window) == "string" then
        window = ImGui.FindWindowByName(window)
        if window == nil then return end
    elseif window.SetWindowSizeAllowFlags == nil then
        window, size, cond = GImGui.CurrentWindow, window, size
    end
    if cond == nil then cond = 0 end

    if ((cond ~= 0) and bit32.band(window.SetWindowSizeAllowFlags, cond) == 0) then
        return
    end

    IM_ASSERT(cond == 0 or ImIsPowerOfTwo(cond))
    window.SetWindowSizeAllowFlags = bit32.band(window.SetWindowSizeAllowFlags, bit32.bnot(bit32.bor(ImGuiCond.Once, ImGuiCond.FirstUseEver, ImGuiCond.Appearing)))

    if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) == 0 or window.Appearing or bit32.band(window.ChildFlags, ImGuiChildFlags.AlwaysAutoResize) ~= 0 then
        window.AutoFitFramesX = (size.x <= 0.0) and 2 or 0
    end
    if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) == 0 or window.Appearing or bit32.band(window.ChildFlags, ImGuiChildFlags.AlwaysAutoResize) ~= 0 then
        window.AutoFitFramesY = (size.y <= 0.0) and 2 or 0
    end

    local old_size_x, old_size_y = window.SizeFull.x, window.SizeFull.y

    if size.x <= 0.0 then
        window.AutoFitOnlyGrows = false
    else
        window.SizeFull.x = IM_TRUNC(size.x)
    end
    if size.y <= 0.0 then
        window.AutoFitOnlyGrows = false
    else
        window.SizeFull.y = IM_TRUNC(size.y)
    end
    if old_size_x ~= window.SizeFull.x or old_size_y ~= window.SizeFull.y then
        ImGui.MarkIniSettingsDirty(window)
    end
end

--- Overloads: SetWindowCollapsed(collapsed, cond) / SetWindowCollapsed(name, collapsed, cond) / SetWindowCollapsed(window, collapsed, cond)
function ImGui.SetWindowCollapsed(window, collapsed, cond)
    if type(window) == "string" then
        window = ImGui.FindWindowByName(window)
        if window == nil then return end
    elseif type(window) == "boolean" then
        window, collapsed, cond = GImGui.CurrentWindow, window, collapsed
    end
    if cond == nil then cond = 0 end
    if cond ~= 0 and bit32.band(window.SetWindowCollapsedAllowFlags, cond) == 0 then
        return
    end
    window.SetWindowCollapsedAllowFlags = bit32.band(window.SetWindowCollapsedAllowFlags, bit32.bnot(bit32.bor(ImGuiCond.Once, ImGuiCond.FirstUseEver, ImGuiCond.Appearing)))

    -- Queue applying in Begin()
    if window.WantCollapseToggle then
        window.Collapsed = not window.Collapsed
    end
    window.WantCollapseToggle = (window.Collapsed ~= collapsed)
end

--- @param window ImGuiWindow
--- @param pos    ImVec2
--- @param size   ImVec2
function ImGui.SetWindowHitTestHole(window, pos, size)
    IM_ASSERT(window.HitTestHoleSize.x == 0) -- We don't support multiple holes/hit test filters
    window.HitTestHoleSize = ImVec2(math.floor(size.x), math.floor(size.y))
    window.HitTestHoleOffset = ImVec2(math.floor(pos.x - window.Pos.x), math.floor(pos.y - window.Pos.y))
end

function ImGui.IsWindowCollapsed()
    return ImGui.GetCurrentWindowRead().Collapsed
end

function ImGui.IsWindowAppearing()
    return ImGui.GetCurrentWindowRead().Appearing
end

function ImGui.GetWindowHeight()
    return GImGui.CurrentWindow.Size.y
end

--- @return ImVec2 # Ref, do not modify
function ImGui.GetWindowPos()
    return GImGui.CurrentWindow.Pos
end

--- @return ImVec2 # Ref, do not modify
function ImGui.GetWindowSize()
    return ImGui.GetCurrentWindowRead().Size
end

-- Overloads: SetWindowFocus() / SetWindowFocus(name). Passing nil name removes focus.
--- @param name? string
function ImGui.SetWindowFocus(...)
    if select("#", ...) == 0 then
        ImGui.FocusWindow(GImGui.CurrentWindow)
        return
    end
    local name = ...
    if name then
        local window = ImGui.FindWindowByName(name)
        if window then
            ImGui.FocusWindow(window)
        end
    else
        ImGui.FocusWindow(nil)
    end
end

--- @param window ImGuiWindow
function ImGui.SetWindowHiddenAndSkipItemsForCurrentFrame(window)
    window.Hidden = true
    window.SkipItems = true
    window.HiddenFramesCanSkipItems = 1
end

--- @param pos    ImVec2
--- @param cond?  ImGuiCond
--- @param pivot? ImVec2
function ImGui.SetNextWindowPos(pos, cond, pivot)
    if cond  == nil then cond  = 0            end
    if pivot == nil then pivot = ImVec2(0, 0) end

    local g = GImGui
    IM_ASSERT(cond == 0 or ImIsPowerOfTwo(cond))

    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasPos)
    ImVec2_Copy(g.NextWindowData.PosVal, pos)
    ImVec2_Copy(g.NextWindowData.PosPivotVal, pivot)
    g.NextWindowData.PosCond = (cond ~= 0) and cond or ImGuiCond.Always
    g.NextWindowData.PosUndock = true
end

--- @param size  ImVec2
--- @param cond? ImGuiCond
function ImGui.SetNextWindowSize(size, cond)
    if cond == nil then cond = 0 end

    local g = GImGui
    IM_ASSERT(cond == 0 or ImIsPowerOfTwo(cond))

    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSize)
    ImVec2_Copy(g.NextWindowData.SizeVal, size)
    g.NextWindowData.SizeCond = (cond ~= 0) and cond or ImGuiCond.Always
end

-- For each axis:
-- - Use 0.0f as min or FLT_MAX as max if you don't want limits, e.g. size_min = (500.0f, 0.0f), size_max = (FLT_MAX, FLT_MAX) sets a minimum width.
-- - Use -1 for both min and max of same axis to preserve current size which itself is a constraint.
-- - See "Demo->Examples->Constrained-resizing window" for examples.
--- @param size_min                   ImVec2
--- @param size_max                   ImVec2
--- @param custom_callback?           function
--- @param custom_callback_user_data? any
function ImGui.SetNextWindowSizeConstraints(size_min, size_max, custom_callback, custom_callback_user_data)
    local g = GImGui
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSizeConstraint)
    g.NextWindowData.SizeConstraintRect = ImRect(size_min, size_max)
    g.NextWindowData.SizeCallback = custom_callback
    g.NextWindowData.SizeCallbackUserData = custom_callback_user_data
end

--- @param alpha float
function ImGui.SetNextWindowBgAlpha(alpha)
    local g = GImGui
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasBgAlpha)
    g.NextWindowData.BgAlphaVal = alpha
end

function ImGui.GetWindowDrawList()
    local window = ImGui.GetCurrentWindow()
    return window.DrawList
end

function ImGui.GetFont()
    return GImGui.Font
end

function ImGui.GetFontSize()
    return GImGui.FontSize
end

--- @return ImVec2
function ImGui.GetFontTexUvWhitePixel()
    return GImGui.DrawListSharedData.TexUvWhitePixel
end

-- This is a shortcut for not taking ownership of 100+ keys, frequently used by drag operations.
-- FIXME: It might be undesirable that this will likely disable KeyOwner-aware shortcuts systems. Consider a more fine-tuned version if needed?
function ImGui.SetActiveIdUsingAllKeyboardKeys()
    local g = GImGui
    IM_ASSERT(g.ActiveId ~= 0)
    g.ActiveIdUsingNavDirMask = (bit32.lshift(1, ImGuiDir.COUNT) - 1)
    g.ActiveIdUsingAllKeyboardKeys = true
    ImGui.NavMoveRequestCancel()
end

--- @return ImVec2 # Ref
function ImGui.GetItemRectMin()
    local g = GImGui
    return g.LastItemData.Rect.Min
end

--- @return ImVec2 # Ref
function ImGui.GetItemRectMax()
    local g = GImGui
    return g.LastItemData.Rect.Max
end

--- @param name         string
--- @param id           ImGuiID
--- @param size_arg     ImVec2
--- @param child_flags  ImGuiChildFlags
--- @param window_flags ImGuiWindowFlags
function ImGui.BeginChildEx(name, id, size_arg, child_flags, window_flags)
    local g = GImGui
    local parent_window = g.CurrentWindow
    IM_ASSERT(id ~= 0)
    if child_flags == nil then child_flags = 0 end
    if window_flags == nil then window_flags = 0 end
    if size_arg == nil then size_arg = ImVec2(0, 0) end

    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasChildFlags) ~= 0 then
        child_flags = bit32.band(bit32.bor(child_flags, g.NextWindowData.ChildFlagsSet), bit32.bnot(g.NextWindowData.ChildFlagsClear))
    end

    -- Sanity check as it is likely that some user will accidentally pass ImGuiWindowFlags into the ImGuiChildFlags argument
    local ImGuiChildFlags_SupportedMask_ = bit32.bor(ImGuiChildFlags.Borders, ImGuiChildFlags.AlwaysUseWindowPadding, ImGuiChildFlags.ResizeX, ImGuiChildFlags.ResizeY, ImGuiChildFlags.AutoResizeX, ImGuiChildFlags.AutoResizeY, ImGuiChildFlags.AlwaysAutoResize, ImGuiChildFlags.FrameStyle, ImGuiChildFlags.NavFlattened)
    -- IM_UNUSED(ImGuiChildFlags_SupportedMask_)
    IM_ASSERT(bit32.band(child_flags, bit32.bnot(ImGuiChildFlags_SupportedMask_)) == 0, "Illegal ImGuiChildFlags value. Did you pass ImGuiWindowFlags values instead of ImGuiChildFlags?")
    IM_ASSERT(bit32.band(window_flags, ImGuiWindowFlags.AlwaysAutoResize) == 0, "Cannot specify ImGuiWindowFlags.AlwaysAutoResize for BeginChild(). Use ImGuiChildFlags.AlwaysAutoResize!")
    if bit32.band(child_flags, ImGuiChildFlags.AlwaysAutoResize) ~= 0 then
        IM_ASSERT(bit32.band(child_flags, bit32.bor(ImGuiChildFlags.ResizeX, ImGuiChildFlags.ResizeY)) == 0, "Cannot use ImGuiChildFlags.ResizeX or ImGuiChildFlags.ResizeY with ImGuiChildFlags.AlwaysAutoResize!")
        IM_ASSERT(bit32.band(child_flags, bit32.bor(ImGuiChildFlags.AutoResizeX, ImGuiChildFlags.AutoResizeY)) ~= 0, "Must use ImGuiChildFlags.AutoResizeX or ImGuiChildFlags.AutoResizeY with ImGuiChildFlags.AlwaysAutoResize!")
    end
    if bit32.band(child_flags, ImGuiChildFlags.AutoResizeX) ~= 0 then
        child_flags = bit32.band(child_flags, bit32.bnot(ImGuiChildFlags.ResizeX))
    end
    if bit32.band(child_flags, ImGuiChildFlags.AutoResizeY) ~= 0 then
        child_flags = bit32.band(child_flags, bit32.bnot(ImGuiChildFlags.ResizeY))
    end

    -- Set window flags
    window_flags = bit32.bor(window_flags, ImGuiWindowFlags.ChildWindow, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoDocking)
    window_flags = bit32.bor(window_flags, bit32.band(parent_window.Flags, ImGuiWindowFlags.NoMove)) -- Inherit the NoMove flag
    if bit32.band(child_flags, bit32.bor(ImGuiChildFlags.AutoResizeX, ImGuiChildFlags.AutoResizeY, ImGuiChildFlags.AlwaysAutoResize)) ~= 0 then
        window_flags = bit32.bor(window_flags, ImGuiWindowFlags.AlwaysAutoResize)
    end
    if bit32.band(child_flags, bit32.bor(ImGuiChildFlags.ResizeX, ImGuiChildFlags.ResizeY)) == 0 then
        window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoSavedSettings)
    end

    -- Special framed style
    if bit32.band(child_flags, ImGuiChildFlags.FrameStyle) ~= 0 then
        ImGui.PushStyleColor(ImGuiCol.ChildBg, g.Style.Colors[ImGuiCol.FrameBg])
        ImGui.PushStyleVar(ImGuiStyleVar.ChildRounding, g.Style.FrameRounding)
        ImGui.PushStyleVar(ImGuiStyleVar.ChildBorderSize, g.Style.FrameBorderSize)
        ImGui.PushStyleVar(ImGuiStyleVar.WindowPadding, g.Style.FramePadding)
        child_flags = bit32.bor(child_flags, ImGuiChildFlags.Borders, ImGuiChildFlags.AlwaysUseWindowPadding)
        window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoMove)
    end

    -- Forward size
    -- Important: Begin() has special processing to switch condition to ImGuiCond_FirstUseEver for a given axis when ImGuiChildFlags.ResizeXXX is set.
    -- (the alternative would to store conditional flags per axis, which is possible but more code)
    local size_avail = ImGui.GetContentRegionAvail()
    local size_default = ImVec2((bit32.band(child_flags, ImGuiChildFlags.AutoResizeX) ~= 0) and 0.0 or size_avail.x, (bit32.band(child_flags, ImGuiChildFlags.AutoResizeY) ~= 0) and 0.0 or size_avail.y)
    local size = ImGui.CalcItemSize(size_arg, size_default.x, size_default.y)

    -- A SetNextWindowSize() call always has priority (#8020)
    -- (since the code in Begin() never supported SizeVal==0.0f aka auto-resize via SetNextWindowSize() call, we don't support it here for now)
    -- FIXME: We only support ImGuiCond_Always in this path. Supporting other paths would requires to obtain window pointer.
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSize) ~= 0 and bit32.band(g.NextWindowData.SizeCond, ImGuiCond.Always) ~= 0 then
        if g.NextWindowData.SizeVal.x > 0.0 then
            size.x = g.NextWindowData.SizeVal.x
            child_flags = bit32.band(child_flags, bit32.bnot(ImGuiChildFlags.ResizeX))
        end
        if g.NextWindowData.SizeVal.y > 0.0 then
            size.y = g.NextWindowData.SizeVal.y
            child_flags = bit32.band(child_flags, bit32.bnot(ImGuiChildFlags.ResizeY))
        end
    end
    ImGui.SetNextWindowSize(size)
    ImGui.SetNextWindowChildFlags(child_flags, true)

    -- Build up name. If you need to append to a same child from multiple location in the ID stack, use BeginChild(ImGuiID id) with a stable value.
    -- FIXME: 2023/11/14: commented out shorted version. We had an issue with multiple ### in child window path names, which the trailing hash helped workaround.
    -- e.g. "ParentName###ParentIdentifier/ChildName###ChildIdentifier" would get hashed incorrectly by ImHashStr(), trailing _%08X somehow fixes it.
    local temp_window_name
    if name then
        temp_window_name = ImFormatString("%s/%s_%08X", parent_window.Name, name, id)
    else
        temp_window_name = ImFormatString("%s/%08X", parent_window.Name, id)
    end

    -- Set style
    local backup_border_size = g.Style.ChildBorderSize
    if bit32.band(child_flags, ImGuiChildFlags.Borders) == 0 then
        g.Style.ChildBorderSize = 0.0
    end

    -- Begin into window
    local _, ret = ImGui.Begin(temp_window_name, nil, window_flags)

    -- Restore style
    g.Style.ChildBorderSize = backup_border_size

    if bit32.band(child_flags, ImGuiChildFlags.FrameStyle) ~= 0 then
        ImGui.PopStyleVar(3)
        ImGui.PopStyleColor()
    end

    local child_window = g.CurrentWindow
    child_window.ChildId = id

    -- Set the cursor to handle case where the user called SetNextWindowPos()+BeginChild() manually.
    -- While this is not really documented/defined, it seems that the expected thing to do.
    if child_window.BeginCount == 1 then
        ImVec2_Copy(parent_window.DC.CursorPos, child_window.Pos)
    end

    -- Process navigation-in immediately so NavInit can run on first frame
    -- Can enter a child if (A) it has navigable items or (B) it can be scrolled.
    local temp_id_for_activation = ImHashStr("##Child", nil, id)
    if g.ActiveId == temp_id_for_activation then
        ImGui.ClearActiveID()
    end
    if g.NavActivateId == id and bit32.band(child_flags, ImGuiChildFlags.NavFlattened) == 0 and (child_window.DC.NavLayersActiveMask ~= 0 or child_window.DC.NavWindowHasScrollY) then
        ImGui.FocusWindow(child_window)
        ImGui.NavInitWindow(child_window, false)
        ImGui.SetActiveID(temp_id_for_activation, child_window) -- Steal ActiveId with another arbitrary id so that key-press won't activate child item
        g.ActiveIdSource = g.NavInputSource
    end

    return ret
end

-- Prior to v1.90 2023/10/16, the BeginChild() function took a 'bool border = false' parameter instead of 'ImGuiChildFlags child_flags = 0'.
-- `true` is accepted as ImGuiChildFlags.Borders for legacy code.
--- @param str_id_or_id string|ImGuiID
--- @param size_arg?     ImVec2
--- @param child_flags?  ImGuiChildFlags|bool
--- @param window_flags? ImGuiWindowFlags
--- @return bool # visible (always call EndChild()!)
function ImGui.BeginChild(str_id_or_id, size_arg, child_flags, window_flags)
    if child_flags == true then child_flags = ImGuiChildFlags.Borders elseif not child_flags then child_flags = 0 end
    if type(str_id_or_id) == "number" then
        return ImGui.BeginChildEx(nil, str_id_or_id, size_arg, child_flags, window_flags)
    end
    local id = ImGui.GetCurrentWindow():GetID(str_id_or_id)
    return ImGui.BeginChildEx(str_id_or_id, id, size_arg, child_flags, window_flags)
end

--- @param window ImGuiWindow
--- @param rect   ImRect
function ImGui.SetLastItemDataForChildWindowItem(window, rect)
    local g = GImGui
    ImGui.SetLastItemData(window.ChildId, g.CurrentItemFlags, window.DC.ChildItemStatusFlags or 0, rect)
end

function ImGui.EndChild()
    local g = GImGui
    local child_window = g.CurrentWindow

    local backup_within_end_child_id = g.WithinEndChildID
    IM_ASSERT(bit32.band(child_window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0) -- Mismatched BeginChild()/EndChild() calls

    g.WithinEndChildID = child_window.ID
    local child_size = ImVec2(child_window.Size.x, child_window.Size.y)
    ImGui.End()
    if child_window.BeginCount == 1 then
        local parent_window = g.CurrentWindow
        local bb = ImRect(parent_window.DC.CursorPos, parent_window.DC.CursorPos + child_size)
        ImGui.ItemSize(child_size)
        local nav_flattened = bit32.band(child_window.ChildFlags, ImGuiChildFlags.NavFlattened) ~= 0
        if (child_window.DC.NavLayersActiveMask ~= 0 or child_window.DC.NavWindowHasScrollY) and not nav_flattened then
            ImGui.ItemAdd(bb, child_window.ChildId)
            ImGui.RenderNavCursor(bb, child_window.ChildId)

            -- When browsing a window that has no activable items (scroll only) we keep a highlight on the child (pass g.NavId to trick into always displaying)
            if child_window.DC.NavLayersActiveMask == 0 and child_window == g.NavWindow then
                ImGui.RenderNavCursor(ImRect(bb.Min - ImVec2(2, 2), bb.Max + ImVec2(2, 2)), g.NavId, ImGuiNavRenderCursorFlags.Compact)
            end
        else
            -- Not navigable into
            ImGui.ItemAdd(bb, child_window.ChildId, nil, ImGuiItemFlags.NoNav)

            -- But when flattened we directly reach items, adjust active layer mask accordingly
            if nav_flattened then
                parent_window.DC.NavLayersActiveMaskNext = bit32.bor(parent_window.DC.NavLayersActiveMaskNext, child_window.DC.NavLayersActiveMaskNext)
            end
        end
        if g.HoveredWindow == child_window then
            g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredWindow)
        end
        child_window.DC.ChildItemStatusFlags = g.LastItemData.StatusFlags
    else
        ImGui.SetLastItemDataForChildWindowItem(child_window, child_window:Rect())
    end

    g.WithinEndChildID = backup_within_end_child_id
    g.LogLinePosY = -FLT_MAX -- To enforce a carriage return
end

--- @param flags   ImGuiChildFlags
--- @param enabled bool
function ImGui.SetNextWindowChildFlags(flags, enabled)
    local g = GImGui
    local nwd = g.NextWindowData
    if bit32.band(nwd.HasFlags, ImGuiNextWindowDataFlags.HasChildFlags) == 0 then
        nwd.ChildFlagsSet = 0; nwd.ChildFlagsClear = 0
    end
    if enabled then
        nwd.ChildFlagsSet = bit32.bor(nwd.ChildFlagsSet, flags)
        nwd.ChildFlagsClear = bit32.band(nwd.ChildFlagsClear, bit32.bnot(flags))
    else
        nwd.ChildFlagsSet = bit32.band(nwd.ChildFlagsSet, bit32.bnot(flags))
        nwd.ChildFlagsClear = bit32.bor(nwd.ChildFlagsClear, flags)
    end
    nwd.HasFlags = bit32.bor(nwd.HasFlags, ImGuiNextWindowDataFlags.HasChildFlags)
end

--- @param flags   ImGuiWindowFlags
--- @param enabled bool
function ImGui.SetNextWindowFlags(flags, enabled)
    local g = GImGui
    local nwd = g.NextWindowData
    if bit32.band(nwd.HasFlags, ImGuiNextWindowDataFlags.HasWindowFlags) == 0 then
        nwd.WindowFlagsSet = 0; nwd.WindowFlagsClear = 0
    end
    if enabled then
        nwd.WindowFlagsSet = bit32.bor(nwd.WindowFlagsSet, flags)
        nwd.WindowFlagsClear = bit32.band(nwd.WindowFlagsClear, bit32.bnot(flags))
    else
        nwd.WindowFlagsSet = bit32.band(nwd.WindowFlagsSet, bit32.bnot(flags))
        nwd.WindowFlagsClear = bit32.bor(nwd.WindowFlagsClear, flags)
    end
    nwd.HasFlags = bit32.bor(nwd.HasFlags, ImGuiNextWindowDataFlags.HasWindowFlags)
end

-- Content size = inner scrollable rectangle, padded with WindowPadding.
--- @param size ImVec2
function ImGui.SetNextWindowContentSize(size)
    local g = GImGui
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasContentSize)
    ImVec2_CopyV(g.NextWindowData.ContentSizeVal, ImTrunc(size.x), ImTrunc(size.y))
end

--- @param scroll ImVec2
function ImGui.SetNextWindowScroll(scroll)
    local g = GImGui
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasScroll)
    ImVec2_Copy(g.NextWindowData.ScrollVal, scroll)
end

--- @param collapsed bool
--- @param cond?     ImGuiCond
function ImGui.SetNextWindowCollapsed(collapsed, cond)
    if cond == nil then cond = 0 end
    local g = GImGui
    IM_ASSERT(cond == 0 or ImIsPowerOfTwo(cond))
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasCollapsed)
    g.NextWindowData.CollapsedVal = collapsed
    g.NextWindowData.CollapsedCond = (cond ~= 0) and cond or ImGuiCond.Always
end

function ImGui.SetNextWindowFocus()
    local g = GImGui
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasFocus)
end

--- @param id ImGuiID
function ImGui.SetNextWindowViewport(id)
    local g = GImGui
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasViewport)
    g.NextWindowData.ViewportId = id
end

--- @param window_class ImGuiWindowClass
function ImGui.SetNextWindowClass(window_class)
    local g = GImGui
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasWindowClass)
    local wc = ImGuiWindowClass()
    for k, v in pairs(window_class) do wc[k] = v end -- C++ copies the struct
    g.NextWindowData.WindowClass = wc
end

-- This is experimental and meant to be a toy for exploring a future/wider range of features.
--- @param flags ImGuiWindowRefreshFlags
function ImGui.SetNextWindowRefreshPolicy(flags)
    local g = GImGui
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasRefreshPolicy)
    g.NextWindowData.RefreshFlagsVal = flags
end

function ImGui.GetWindowDpiScale()
    return 1.0 -- Roblox: single viewport, no DPI scaling
end

function ImGui.GetWindowViewport()
    local g = GImGui
    return g.CurrentViewport or ImGui.GetMainViewport()
end

-- Prefer using PushFont(nil, style.FontSizeBase * factor), or use style.FontScaleMain to scale all windows.
--- @param scale float
function ImGui.SetWindowFontScale(scale)
    IM_ASSERT(scale > 0.0)
    local window = ImGui.GetCurrentWindow()
    window.FontWindowScale = scale
    ImGui.UpdateCurrentFontSize(0.0)
end

--- @param window ImGuiWindow
function ImGui.StartMouseMovingWindow(window)
    local g = GImGui
    ImGui.FocusWindow(window)
    ImGui.SetActiveID(window.MoveId, window)
    if (g.IO.ConfigNavCursorVisibleAuto) then
        g.NavCursorVisible = false
    end
    g.ActiveIdClickOffset = g.IO.MouseClickedPos[0] - window.RootWindowDockTree.Pos
    g.ActiveIdNoClearOnFocusLoss = true
    ImGui.SetActiveIdUsingAllKeyboardKeys()

    local can_move_window = true
    if bit32.band(window.Flags, ImGuiWindowFlags.NoMove) ~= 0 or bit32.band(window.RootWindowDockTree.Flags, ImGuiWindowFlags.NoMove) ~= 0 then
        can_move_window = false
    end
    local node = window.DockNodeAsHost
    if node and node.VisibleWindow and bit32.band(node.VisibleWindow.Flags, ImGuiWindowFlags.NoMove) ~= 0 then
        can_move_window = false
    end
    if can_move_window then
        g.MovingWindow = window
    end
end

function ImGui.UpdateMouseMovingWindowNewFrame()
    local g = GImGui

    if g.MovingWindow then
        ImGui.KeepAliveID(g.ActiveId)
        IM_ASSERT(g.MovingWindow and g.MovingWindow.RootWindowDockTree)

        local moving_window = g.MovingWindow.RootWindowDockTree

        local window_disappeared = (not moving_window.WasActive and not moving_window.Active)
        if g.IO.MouseDown[0] and ImGui.IsMousePosValid(g.IO.MousePos) and not window_disappeared then
            local pos = g.IO.MousePos - g.ActiveIdClickOffset
            if moving_window.Pos.x ~= pos.x or moving_window.Pos.y ~= pos.y then
                ImGui.SetWindowPos(moving_window, pos, ImGuiCond.Always)
                if moving_window.Viewport and moving_window.ViewportOwned then -- Synchronize viewport immediately because some overlays may relies on clipping rectangle before we Begin() into the window.
                    ImVec2_Copy(moving_window.Viewport.Pos, pos)
                    moving_window.Viewport:UpdateWorkRect()
                end
            end
            ImGui.FocusWindow(g.MovingWindow)
        else
            ImGui.StopMouseMovingWindow()
            ImGui.ClearActiveID()
        end
    else
        if (g.ActiveIdWindow and g.ActiveIdWindow.MoveId == g.ActiveId) then
            ImGui.KeepAliveID(g.ActiveId)

            if not g.IO.MouseDown[0] then
                ImGui.ClearActiveID()
            end
        end
    end
end

function ImGui.GetDrawListSharedData()
    return GImGui.DrawListSharedData
end

--- @param id          ImGuiID
--- @param popup_flags ImGuiPopupFlags
function ImGui.IsPopupOpen(id, popup_flags)
    local g = GImGui
    if popup_flags == nil then popup_flags = 0 end
    if type(id) == "string" then
        -- str_id overload: with AnyPopupId the id must be 0, otherwise it is hashed with the current window's ID stack
        id = (bit32.band(popup_flags, ImGuiPopupFlags.AnyPopupId) ~= 0) and 0 or g.CurrentWindow:GetID(id)
    end

    if bit32.band(popup_flags, ImGuiPopupFlags.AnyPopupId) ~= 0 then
        -- Return true if any popup is open at the current BeginPopup() level of the popup stack
        -- This may be used to e.g. test for another popups already opened to handle popups priorities at the same level.
        IM_ASSERT(id == 0)
        if bit32.band(popup_flags, ImGuiPopupFlags.AnyPopupLevel) ~= 0 then
            return g.OpenPopupStack.Size > 0
        else
            return g.OpenPopupStack.Size > g.BeginPopupStack.Size
        end
    else
        if bit32.band(popup_flags, ImGuiPopupFlags.AnyPopupLevel) ~= 0 then
            -- Return true if the popup is open anywhere in the popup stack
            for n = 1, g.OpenPopupStack.Size do
                if g.OpenPopupStack.Data[n].PopupId == id then
                    return true
                end
            end
            return false
        else
            -- Return true if the popup is open at the current BeginPopup() level of the popup stack (this is the most-common query)
            return g.OpenPopupStack.Size > g.BeginPopupStack.Size and g.OpenPopupStack.Data[g.BeginPopupStack.Size + 1].PopupId == id
        end
    end
end

--- @return ImGuiWindow?
function ImGui.GetTopMostPopupModal()
    local g = GImGui
    for n = g.OpenPopupStack.Size, 1, -1 do
        local popup = g.OpenPopupStack.Data[n].Window
        if popup then
            if bit32.band(popup.Flags, ImGuiWindowFlags.Modal) ~= 0 then
                return popup
            end
        end
    end
    return nil
end

function ImGui.UpdateMouseMovingWindowEndFrame()
    local g = GImGui

    if g.ActiveId ~= 0 or (g.HoveredId ~= 0 and not g.HoveredIdIsDisabled) then
        return
    end

    if g.NavWindow and g.NavWindow.Appearing then
        return
    end

    local hovered_window = g.HoveredWindow

    if ImGui.IsMouseClickedEx(0, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner) then
        local hovered_root
        if hovered_window then
            hovered_root = hovered_window.RootWindow
        else
            hovered_root = nil
        end
        local is_closed_popup = hovered_root and (bit32.band(hovered_root.Flags, ImGuiWindowFlags.Popup) ~= 0) and not ImGui.IsPopupOpen(hovered_root.PopupId, ImGuiPopupFlags.AnyPopupLevel)
        local is_queued_focus_request = g.NavMoveSubmitted and (bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.FocusApi) ~= 0)

        if hovered_window ~= nil and not is_closed_popup and not is_queued_focus_request then
            ImGui.StartMouseMovingWindow(hovered_window)

            -- Cancel moving if clicked outside of title bar
            if bit32.band(hovered_window.BgClickFlags, ImGuiWindowBgClickFlags.Move) == 0 then  -- set by io.ConfigWindowsMoveFromTitleBarOnly
                if bit32.band(hovered_root.Flags, ImGuiWindowFlags.NoTitleBar) == 0 then
                    if not hovered_root:TitleBarRect():Contains(g.IO.MouseClickedPos[0]) then
                        g.MovingWindow = nil
                    end
                end
            end

            -- Cancel moving if clicked over an item which was disabled or inhibited by popups
            -- (when g.HoveredIdIsDisabled == true && g.HoveredId == 0 we are inhibited by popups, when g.HoveredIdIsDisabled == true && g.HoveredId != 0 we are over a disabled item)
            if g.HoveredIdIsDisabled then
                g.MovingWindow = nil
                g.ActiveIdDisabledId = g.HoveredId
            end
        elseif hovered_window == nil and g.NavWindow ~= nil then
            ImGui.FocusWindow(nil, ImGuiFocusRequestFlags.UnlessBelowModal)
        end
    end

    -- With right mouse button we close popups without changing focus based on where the mouse is aimed
    -- Instead, focus will be restored to the window under the bottom-most closed popup.
    -- (The left mouse button path calls FocusWindow on the hovered window, which will lead NewFrame->ClosePopupsOverWindow to trigger)
    if g.HoveredId == 0 and ImGui.IsMouseClickedEx(1, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner) then
        -- Find the top-most window between HoveredWindow and the top-most Modal Window.
        -- This is where we can trim the popup stack.
        local modal = ImGui.GetTopMostPopupModal()
        local hovered_window_above_modal = hovered_window and (modal == nil or ImGui.IsWindowAbove(hovered_window, modal))
        ImGui.ClosePopupsOverWindow(hovered_window_above_modal and hovered_window or modal, true)
    end
end

--- @param window ImGuiWindow
--- @param delta  ImVec2
function ImGui.TranslateWindow(window, delta)
    ImVec2_Copy(window.Pos, window.Pos + delta)
    window.ClipRect:Translate(delta)
    window.OuterRectClipped:Translate(delta)
    window.InnerRect:Translate(delta)

    ImVec2_Copy(window.DC.CursorPos, window.DC.CursorPos + delta)
    ImVec2_Copy(window.DC.CursorStartPos, window.DC.CursorStartPos + delta)
    ImVec2_Copy(window.DC.CursorMaxPos, window.DC.CursorMaxPos + delta)
    ImVec2_Copy(window.DC.IdealMaxPos, window.DC.IdealMaxPos + delta)
end

--- ImGui::FindWindowByID
function ImGui.FindWindowByID(id)
    local g = GImGui

    if not g then return end

    return g.WindowsById[id]
end

--- @param name string
--- @return ImGuiWindow?
function ImGui.FindWindowByName(name)
    local id = ImHashStr(name)
    return ImGui.FindWindowByID(id)
end

--- Push a new Dear ImGui window to add widgets to.
--- - Passing a non-nil `open` displays a close button on the upper-right corner of the window
--- @param name     string
--- @param open?    bool
--- @param flags?   ImGuiWindowFlags
--- @return bool is_open       # The updated `open` passed in
--- @return bool no_skip_items # You always need to call `ImGui.End()` even if false is returned
function ImGui.Begin(name, open, flags)
    if flags == nil then flags = 0 end

    local g = GImGui
    local style = g.Style

    IM_ASSERT(name ~= nil and name ~= "")
    IM_ASSERT(g.WithinFrameScope)
    IM_ASSERT(g.FrameCountEnded ~= g.FrameCount)

    local window = ImGui.FindWindowByName(name)
    local window_just_created = (window == nil)
    if window_just_created then
        window = CreateNewWindow(name, flags) --- @cast window ImGuiWindow
    end

    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasWindowFlags) ~= 0 then
        flags = bit32.band(bit32.bor(flags, g.NextWindowData.WindowFlagsSet), bit32.bnot(g.NextWindowData.WindowFlagsClear))
    end

    -- Automatically disable manual moving/resizing when NoInputs is set
    if bit32.band(flags, ImGuiWindowFlags.NoInputs) == ImGuiWindowFlags.NoInputs then
        flags = bit32.bor(flags, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoResize)
    end

    local current_frame = g.FrameCount
    local first_begin_of_the_frame = (window.LastFrameActive ~= current_frame)
    window.IsFallbackWindow = (g.CurrentWindowStack.Size == 0 and g.WithinFrameScopeWithImplicitWindow)

    local window_just_activated_by_user = (window.LastFrameActive < (current_frame - 1))
    if bit32.band(flags, ImGuiWindowFlags.Popup) ~= 0 then
        local popup_ref = g.OpenPopupStack.Data[g.BeginPopupStack.Size + 1]
        window_just_activated_by_user = window_just_activated_by_user or (window.PopupId ~= popup_ref.PopupId) -- We recycle popups so treat window as activated if popup id changed
        window_just_activated_by_user = window_just_activated_by_user or (window ~= popup_ref.Window)
    end

    -- Update Flags, LastFrameActive, BeginOrderXXX fields
    local window_was_appearing = window.Appearing
    if first_begin_of_the_frame then
        ImGui.UpdateWindowInFocusOrderList(window, window_just_created, flags)
        window.Appearing = window_just_activated_by_user
        if (window.Appearing) then
            SetWindowConditionAllowFlags(window, ImGuiCond.Appearing, true)
        end
        window.FlagsPreviousFrame = window.Flags
        window.Flags = flags
        window.ChildFlags = (bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasChildFlags) ~= 0) and g.NextWindowData.ChildFlagsSet or 0
        window.LastFrameActive = current_frame
        window.LastTimeActive = g.Time
        window.BeginOrderWithinParent = 0
        window.BeginOrderWithinContext = g.WindowsActiveCount
        g.WindowsActiveCount = g.WindowsActiveCount + 1
    else
        flags = window.Flags
    end

    -- Docking
    -- (NB: during the frame dock nodes are created, it is possible that (window->DockIsActive == false) even though (window->DockNode->Windows.Size > 1)
    IM_ASSERT(window.DockNode == nil or window.DockNodeAsHost == nil) -- Cannot be both
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasDock) ~= 0 then
        ImGui.SetWindowDock(window, g.NextWindowData.DockId, g.NextWindowData.DockCond)
    end
    if first_begin_of_the_frame then
        local has_dock_node = (window.DockId ~= 0 or window.DockNode ~= nil)
        local new_auto_dock_node = not has_dock_node and ImGui.GetWindowAlwaysWantOwnTabBar(window)
        local dock_node_was_visible = window.DockNodeIsVisible
        local dock_tab_was_visible = window.DockTabIsVisible
        window.DockIsActive = false
        window.DockNodeIsVisible = false
        window.DockTabIsVisible = false

        if has_dock_node or new_auto_dock_node then
            open = ImGui.BeginDocked(window, open)
            flags = window.Flags
            if window.DockIsActive then
                IM_ASSERT(window.DockNode ~= nil)
                g.NextWindowData.HasFlags = bit32.band(g.NextWindowData.HasFlags, bit32.bnot(ImGuiNextWindowDataFlags.HasSizeConstraint))
            end

            -- Amend the Appearing flag
            if window.DockTabIsVisible and not dock_tab_was_visible and dock_node_was_visible and not window.Appearing and not window_was_appearing then
                window.Appearing = true
                SetWindowConditionAllowFlags(window, ImGuiCond.Appearing, true)
            end
        end
    end

    local parent_window_in_stack
    if window.DockIsActive and window.DockNode.HostWindow then
        parent_window_in_stack = window.DockNode.HostWindow
    elseif g.CurrentWindowStack:empty() then
        parent_window_in_stack = nil
    else
        parent_window_in_stack = g.CurrentWindowStack:back().Window
    end
    local parent_window
    if first_begin_of_the_frame then
        if (bit32.band(flags, bit32.bor(ImGuiWindowFlags.ChildWindow, ImGuiWindowFlags.Popup, ImGuiWindowFlags.Tooltip)) ~= 0) then
            parent_window = parent_window_in_stack
        else
            parent_window = nil
        end
    else
        parent_window = window.ParentWindow
    end

    if window.IDStack.Size == 0 then
        window.IDStack:push_back(window.ID)
    end

    -- Add to stack
    g.CurrentWindow = window
    g.CurrentWindowStack:resize(g.CurrentWindowStack.Size + 1)
    g.CurrentWindowStack.Data[g.CurrentWindowStack.Size] = ImGuiWindowStackData()
    local window_stack_data = g.CurrentWindowStack.Data[g.CurrentWindowStack.Size]
    window_stack_data.Window = window
    ImGuiLastItemData_Copy(window_stack_data.ParentLastItemDataBackup, g.LastItemData)
    window_stack_data.DisabledOverrideReenable = (bit32.band(flags, ImGuiWindowFlags.Tooltip) ~= 0) and (bit32.band(g.CurrentItemFlags, ImGuiItemFlags.Disabled) ~= 0)
    window_stack_data.DisabledOverrideReenableAlphaBackup = 0.0
    window_stack_data.StackSizesInBegin = ImGuiErrorRecoveryState()
    ImGui.ErrorRecoveryStoreState(window_stack_data.StackSizesInBegin)
    g.StackSizesInBeginForCurrentWindow = window_stack_data.StackSizesInBegin
    if bit32.band(flags, ImGuiWindowFlags.ChildMenu) ~= 0 then
        g.BeginMenuDepth = g.BeginMenuDepth + 1
    end

    if first_begin_of_the_frame then
        ImGui.UpdateWindowParentAndRootLinks(window, flags, parent_window)
        window.ParentWindowInBeginStack = parent_window_in_stack

        if window.RootWindow ~= window then
            window.ParentWindowForFocusRoute = parent_window_in_stack
        else
            window.ParentWindowForFocusRoute = nil
        end
        if window.ParentWindowForFocusRoute == nil and window.DockNode ~= nil then
            if bit32.band(window.DockNode.MergedFlags, ImGuiDockNodeFlags.DockedWindowsInFocusRoute) ~= 0 then
                window.ParentWindowForFocusRoute = window.DockNode.HostWindow
            end
        end
        if window.WindowClass and window.WindowClass.FocusRouteParentWindowId ~= nil and window.WindowClass.FocusRouteParentWindowId ~= 0 then
            window.ParentWindowForFocusRoute = ImGui.FindWindowByID(window.WindowClass.FocusRouteParentWindowId)
        end

        if parent_window then
            window.FontWindowScaleParents = parent_window.FontWindowScaleParents * parent_window.FontWindowScale
        else
            window.FontWindowScaleParents = 1.0
        end
    end

    ImGui.PushFocusScope((bit32.band(window.ChildFlags, ImGuiChildFlags.NavFlattened) ~= 0) and g.CurrentFocusScopeId or window.ID)
    window.NavRootFocusScopeId = g.CurrentFocusScopeId

    -- Add to popup stacks: update OpenPopupStack data, push to BeginPopupStack
    if bit32.band(flags, ImGuiWindowFlags.Popup) ~= 0 then
        local popup_ref = g.OpenPopupStack.Data[g.BeginPopupStack.Size + 1]
        popup_ref.Window = window
        popup_ref.ParentNavLayer = parent_window_in_stack.DC.NavLayerCurrent
        g.BeginPopupStack:push_back(popup_ref)
        window.PopupId = popup_ref.PopupId
    end

    local window_pos_set_by_api = false
    local window_size_x_set_by_api = false
    local window_size_y_set_by_api = false
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasPos) ~= 0 then
        window_pos_set_by_api = (bit32.band(window.SetWindowPosAllowFlags, g.NextWindowData.PosCond) ~= 0)
        if window_pos_set_by_api and ImLengthSqr(g.NextWindowData.PosPivotVal) > 1e-5 then
            -- FIXME: Look into removing the branch so everything can go through this same code path for consistency.
            ImVec2_Copy(window.SetWindowPosVal, g.NextWindowData.PosVal)
            ImVec2_Copy(window.SetWindowPosPivot, g.NextWindowData.PosPivotVal)
            window.SetWindowPosAllowFlags = bit32.band(window.SetWindowPosAllowFlags, bit32.bnot(bit32.bor(ImGuiCond.Once, ImGuiCond.FirstUseEver, ImGuiCond.Appearing)))
        else
            ImGui.SetWindowPos(window, g.NextWindowData.PosVal, g.NextWindowData.PosCond)
        end
    end
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSize) ~= 0 then
        window_size_x_set_by_api = (bit32.band(window.SetWindowSizeAllowFlags, g.NextWindowData.SizeCond) ~= 0) and (g.NextWindowData.SizeVal.x > 0.0)
        window_size_y_set_by_api = (bit32.band(window.SetWindowSizeAllowFlags, g.NextWindowData.SizeCond) ~= 0) and (g.NextWindowData.SizeVal.y > 0.0)
        if (bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeX) ~= 0 and bit32.band(window.SetWindowSizeAllowFlags, ImGuiCond.FirstUseEver) == 0) then
            g.NextWindowData.SizeVal.x = window.SizeFull.x
        end
        if (bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeY) ~= 0 and bit32.band(window.SetWindowSizeAllowFlags, ImGuiCond.FirstUseEver) == 0) then
            g.NextWindowData.SizeVal.y = window.SizeFull.y
        end
        ImGui.SetWindowSize(window, g.NextWindowData.SizeVal, g.NextWindowData.SizeCond);
    end
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasScroll) ~= 0 then
        if g.NextWindowData.ScrollVal.x >= 0.0 then
            window.ScrollTarget.x = g.NextWindowData.ScrollVal.x
            window.ScrollTargetCenterRatio.x = 0.0
        end
        if g.NextWindowData.ScrollVal.y >= 0.0 then
            window.ScrollTarget.y = g.NextWindowData.ScrollVal.y
            window.ScrollTargetCenterRatio.y = 0.0
        end
    end
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasContentSize) ~= 0 then
        ImVec2_Copy(window.ContentSizeExplicit, g.NextWindowData.ContentSizeVal)
    elseif first_begin_of_the_frame then
        window.ContentSizeExplicit = ImVec2(0.0, 0.0)
    end
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasWindowClass) ~= 0 then
        window.WindowClass = g.NextWindowData.WindowClass
    end
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasCollapsed) ~= 0 then
        ImGui.SetWindowCollapsed(window, g.NextWindowData.CollapsedVal, g.NextWindowData.CollapsedCond)
    end
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasFocus) ~= 0 then
        ImGui.FocusWindow(window)
    end
    if window.Appearing then
        SetWindowConditionAllowFlags(window, ImGuiCond.Appearing, false)
    end

    -- [EXPERIMENTAL] Skip Refresh mode
    ImGui.UpdateWindowSkipRefresh(window)

    if window_stack_data.DisabledOverrideReenable and window.RootWindow == window then
        ImGui.BeginDisabledOverrideReenable()
    end

    g.CurrentWindow = nil

    if first_begin_of_the_frame and not window.SkipRefresh then
        local window_is_child_tooltip = (bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 and bit32.band(flags, ImGuiWindowFlags.Tooltip) ~= 0)
        local window_just_appearing_after_hidden_for_resize = (window.HiddenFramesCannotSkipItems > 0)

        window.Active = true
        window.HasCloseButton = (open ~= nil)
        ImRect_CopyFromV4(window.ClipRect, ImVec4(-FLT_MAX, -FLT_MAX, FLT_MAX, FLT_MAX))

        window.IDStack:resize(1)

        window.DrawList:_ResetForNewFrame()
        window.DC.CurrentTableIdx = -1
        if bit32.band(flags, ImGuiWindowFlags.DockNodeHost) ~= 0 then
            window.DrawList:ChannelsSplit(2)
            window.DrawList:ChannelsSetCurrent(1) -- DOCKING_HOST_DRAW_CHANNEL_FG: render decorations on channel 1, backgrounds rendered manually later
        end

        if window.MemoryCompacted then
            ImGui.GcAwakeTransientWindowBuffers(window)
        end

        -- UPDATE CONTENTS SIZE, UPDATE HIDDEN STATUS
        -- Update contents size from last frame for auto-fitting (or use explicit size)
        CalcWindowContentSizes(window, window.ContentSize, window.ContentSizeIdeal)
        if window.HiddenFramesCanSkipItems > 0 then
            window.HiddenFramesCanSkipItems = window.HiddenFramesCanSkipItems - 1
        end
        if window.HiddenFramesCannotSkipItems > 0 then
            window.HiddenFramesCannotSkipItems = window.HiddenFramesCannotSkipItems - 1
        end
        if window.HiddenFramesForRenderOnly > 0 then
            window.HiddenFramesForRenderOnly = window.HiddenFramesForRenderOnly - 1
        end

        -- Hide new windows for one frame until they calculate their size
        if window_just_created and (not window_size_x_set_by_api or not window_size_y_set_by_api) then
            window.HiddenFramesCannotSkipItems = 1
        end

        -- Hide popup/tooltip window when re-opening while we measure size (because we recycle the windows)
        -- We reset Size/ContentSize for reappearing popups/tooltips early in this function, so further code won't be tempted to use the old size.
        if window_just_activated_by_user and bit32.band(flags, bit32.bor(ImGuiWindowFlags.Popup, ImGuiWindowFlags.Tooltip)) ~= 0 then
            window.HiddenFramesCannotSkipItems = 1
            if bit32.band(flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0 then
                if not window_size_x_set_by_api then
                    window.SizeFull.x = 0.0
                    window.Size.x = 0.0
                end
                if not window_size_y_set_by_api then
                    window.SizeFull.y = 0.0
                    window.Size.y = 0.0
                end
                ImVec2_Copy(window.ContentSize, ImVec2(0.0, 0.0))
                ImVec2_Copy(window.ContentSizeIdeal, ImVec2(0.0, 0.0))
            end
        end

        -- SELECT VIEWPORT
        ImGui.WindowSelectViewport(window)
        ImGui.SetCurrentViewport(window, window.Viewport)
        SetCurrentWindow(window)
        flags = window.Flags

        if not window.DockIsActive and bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
            window.WindowBorderSize = style.ChildBorderSize
        else
            window.WindowBorderSize = (bit32.band(flags, bit32.bor(ImGuiWindowFlags.Popup, ImGuiWindowFlags.Tooltip)) ~= 0 and bit32.band(flags, ImGuiWindowFlags.Modal) == 0) and style.PopupBorderSize or style.WindowBorderSize
        end
        window.WindowPadding = style.WindowPadding
        if not window.DockIsActive and (bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0) and (bit32.band(flags, ImGuiWindowFlags.Popup) == 0) and (bit32.band(window.ChildFlags, ImGuiChildFlags.AlwaysUseWindowPadding) == 0) and window.WindowBorderSize == 0.0 then
            if bit32.band(flags, ImGuiWindowFlags.MenuBar) ~= 0 then
                window.WindowPadding = ImVec2(0.0, style.WindowPadding.y)
            else
                window.WindowPadding = ImVec2(0.0, 0.0)
            end
        end

        -- Lock menu offset so size calculation can use it as menu-bar windows need a minimum size.
        window.DC.MenuBarOffset.x = ImMax(ImMax(window.WindowPadding.x, style.ItemSpacing.x), g.NextWindowData.MenuBarOffsetMinVal.x)
        window.DC.MenuBarOffset.y = g.NextWindowData.MenuBarOffsetMinVal.y

        if bit32.band(flags, ImGuiWindowFlags.NoTitleBar) ~= 0 then
            window.TitleBarHeight = 0.0
        else
            window.TitleBarHeight = g.FontSize + g.Style.FramePadding.y * 2.0
        end

        if bit32.band(flags, ImGuiWindowFlags.MenuBar) ~= 0 then
            window.MenuBarHeight = window.DC.MenuBarOffset.y + g.FontSize + g.Style.FramePadding.y * 2.0
        else
            window.MenuBarHeight = 0.0
        end

        window.TitleBarHeight = (bit32.band(flags, ImGuiWindowFlags.NoTitleBar) ~= 0) and 0 or g.FontSize + g.Style.FramePadding.y * 2

        window.FontRefSize = g.FontSize  -- Lock this to discourage calling window:CalcFontSize() outside of current window.

        local use_current_size_for_scrollbar_x = window_just_created
        local use_current_size_for_scrollbar_y = window_just_created
        if window_size_x_set_by_api and window.ContentSizeExplicit.x ~= 0.0 then
            use_current_size_for_scrollbar_x = true
        end
        if window_size_y_set_by_api and window.ContentSizeExplicit.y ~= 0.0 then
            use_current_size_for_scrollbar_y = true
        end

        -- Collapse window by double-clicking on title bar
        -- At this point we don't have a clipping rectangle setup yet, so we can use the title bar area for hit detection and drawing
        if bit32.band(flags, ImGuiWindowFlags.NoTitleBar) == 0 and bit32.band(flags, ImGuiWindowFlags.NoCollapse) == 0 and not window.DockIsActive then
            local title_bar_rect = window:TitleBarRect()
            if g.HoveredWindow == window and g.HoveredId == 0 and g.HoveredIdPreviousFrame == 0 and g.ActiveId == 0 and ImGui.IsMouseHoveringRect(title_bar_rect.Min, title_bar_rect.Max) then
                if g.IO.MouseClickedCount[0] == 2 and ImGui.GetKeyOwner(ImGuiKey.MouseLeft) == ImGuiKeyOwner_NoOwner then
                    window.WantCollapseToggle = true
                    ImGui.SetKeyOwner(ImGuiKey.MouseLeft, window.MoveId)
                end
            end
            if window.WantCollapseToggle then
                window.Collapsed = not window.Collapsed
                if not window.Collapsed then
                    use_current_size_for_scrollbar_y = true
                end
                ImGui.MarkIniSettingsDirty(window)
            end
        else
            window.Collapsed = false
        end
        window.WantCollapseToggle = false

        local scrollbar_sizes_from_last_frame = ImVec2()
        ImVec2_Copy(scrollbar_sizes_from_last_frame, window.ScrollbarSizes)

        window.DecoOuterSizeX1 = 0.0
        window.DecoOuterSizeX2 = 0.0
        window.DecoOuterSizeY1 = window.TitleBarHeight + window.MenuBarHeight
        window.DecoOuterSizeY2 = 0.0
        window.ScrollbarSizes = ImVec2(0.0, 0.0)

        -- Calculate auto-fit size, handle automatic resize
        -- - Using SetNextWindowSize() overrides ImGuiWindowFlags.AlwaysAutoResize, so it can be used on tooltips/popups, etc.
        -- - We still process initial auto-fit on collapsed windows to get a window width, but otherwise don't honor ImGuiWindowFlags.AlwaysAutoResize when collapsed.
        -- - Auto-fit may only grow window during the first few frames.
        do
            local size_auto_fit_x_always = not window_size_x_set_by_api and (bit32.band(flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0) and not window.Collapsed
            local size_auto_fit_y_always = not window_size_y_set_by_api and (bit32.band(flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0) and not window.Collapsed
            local size_auto_fit_x_current = not window_size_x_set_by_api and (window.AutoFitFramesX > 0)
            local size_auto_fit_y_current = not window_size_y_set_by_api and (window.AutoFitFramesY > 0)

            local size_auto_fit_mask = 0
            if size_auto_fit_x_always or size_auto_fit_x_current then
                size_auto_fit_mask = bit32.bor(size_auto_fit_mask, bit32.lshift(1, ImGuiAxis.X - 1))
            end
            if size_auto_fit_y_always or size_auto_fit_y_current then
                size_auto_fit_mask = bit32.bor(size_auto_fit_mask, bit32.lshift(1, ImGuiAxis.Y - 1))
            end

            local size_auto_fit = CalcWindowAutoFitSize(window, window.ContentSizeIdeal, size_auto_fit_mask)
            local old_size = ImVec2(window.SizeFull.x, window.SizeFull.y)

            if size_auto_fit_x_always or size_auto_fit_x_current then
                if size_auto_fit_x_always then
                    window.SizeFull.x = size_auto_fit.x
                else
                    if window.AutoFitOnlyGrows then
                        window.SizeFull.x = ImMax(window.SizeFull.x, size_auto_fit.x)
                    else
                        window.SizeFull.x = size_auto_fit.x
                    end
                end
                use_current_size_for_scrollbar_x = true
            end
            if size_auto_fit_y_always or size_auto_fit_y_current then
                if size_auto_fit_y_always then
                    window.SizeFull.y = size_auto_fit.y
                else
                    if window.AutoFitOnlyGrows then
                        window.SizeFull.y = ImMax(window.SizeFull.y, size_auto_fit.y)
                    else
                        window.SizeFull.y = size_auto_fit.y
                    end
                end
                use_current_size_for_scrollbar_y = true
            end

            if old_size.x ~= window.SizeFull.x or old_size.y ~= window.SizeFull.y then
                ImGui.MarkIniSettingsDirty(window)
            end
        end

        ImVec2_Copy(window.SizeFull, CalcWindowSizeAfterConstraint(window, window.SizeFull))
        ImVec2_Copy(window.Size, (window.Collapsed and bit32.band(flags, ImGuiWindowFlags.ChildWindow) == 0) and window:TitleBarRect():GetSize() or window.SizeFull)

        -- POSITION

        -- Popup latch its initial position, will position itself when it appears next frame
        if window_just_activated_by_user then
            window.AutoPosLastDirection = ImGuiDir.None
            if bit32.band(flags, ImGuiWindowFlags.Popup) ~= 0 and bit32.band(flags, ImGuiWindowFlags.Modal) == 0 and not window_pos_set_by_api then -- FIXME: BeginPopup() could use SetNextWindowPos()
                ImVec2_Copy(window.Pos, g.BeginPopupStack:back().OpenPopupPos)
            end
        end

        if bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
            IM_ASSERT(parent_window and parent_window.Active)
            window.BeginOrderWithinParent = parent_window.DC.ChildWindows.Size
            parent_window.DC.ChildWindows:push_back(window)
            if (bit32.band(flags, ImGuiWindowFlags.Popup) == 0) and not window_pos_set_by_api and not window_is_child_tooltip then
                ImVec2_Copy(window.Pos, parent_window.DC.CursorPos)
            end
        end

        local window_pos_with_pivot = (window.SetWindowPosVal.x ~= FLT_MAX and window.HiddenFramesCannotSkipItems == 0)
        if window_pos_with_pivot then
            ImGui.SetWindowPos(window, window.SetWindowPosVal - window.Size * window.SetWindowPosPivot, 0) -- Position given a pivot (e.g. for centering)
        elseif (bit32.band(flags, ImGuiWindowFlags.ChildMenu) ~= 0) then
            ImVec2_Copy(window.Pos, ImGui.FindBestWindowPosForPopup(window))
        elseif (bit32.band(flags, ImGuiWindowFlags.Popup) ~= 0) and not window_pos_set_by_api and window_just_appearing_after_hidden_for_resize then
            ImVec2_Copy(window.Pos, ImGui.FindBestWindowPosForPopup(window))
        elseif (bit32.band(flags, ImGuiWindowFlags.Tooltip) ~= 0) and not window_pos_set_by_api and not window_is_child_tooltip then
            ImVec2_Copy(window.Pos, ImGui.FindBestWindowPosForPopup(window))
        end

        -- Late create viewport if we don't fit within our current host viewport.
        if window.ViewportAllowPlatformMonitorExtend >= 0 and not window.ViewportOwned and bit32.band(window.Viewport.Flags, ImGuiViewportFlags.IsMinimized) == 0 then
            if not window.Viewport:GetMainRect():Contains(window:Rect()) then
                -- This is based on the assumption that the DPI will be known ahead (same as the DPI of the selection done in UpdateSelectWindowViewport)
                -- local old_viewport = window.Viewport
                window.Viewport = ImGui.AddUpdateViewport(window, window.ID, window.Pos, window.Size, ImGuiViewportFlags.NoFocusOnAppearing)

                -- FIXME-DPI
                -- IM_ASSERT(old_viewport.DpiScale == window.Viewport.DpiScale) -- FIXME-DPI: Something went wrong
                ImGui.SetCurrentViewport(window, window.Viewport)
                SetCurrentWindow(window)
            end
        end

        if window.ViewportOwned then
            ImGui.WindowSyncOwnedViewport(window, parent_window_in_stack)
        end

        local viewport_rect = window.Viewport:GetMainRect()
        local viewport_work_rect = window.Viewport:GetWorkRect()
        local visibility_padding = ImMax(style.DisplayWindowPadding, style.DisplaySafeAreaPadding)
        local visibility_rect = ImRect(viewport_work_rect.Min + visibility_padding, viewport_work_rect.Max - visibility_padding)

        -- Clamp position/size so window stays visible within its viewport or monitor
        if not window_pos_set_by_api and bit32.band(flags, ImGuiWindowFlags.ChildWindow) == 0 then
            if not window.ViewportOwned and viewport_rect:GetWidth() > 0 and viewport_rect:GetHeight() > 0.0 then
                local size_for_clamping_y = window.Size.y
                if bit32.band(window.BgClickFlags, ImGuiWindowBgClickFlags.Move) == 0 and bit32.band(window.Flags, ImGuiWindowFlags.NoTitleBar) == 0 then
                    size_for_clamping_y = window.TitleBarHeight
                end
                window.Pos.x = ImClamp(window.Pos.x, visibility_rect.Min.x - window.Size.x, visibility_rect.Max.x)
                window.Pos.y = ImClamp(window.Pos.y, visibility_rect.Min.y - size_for_clamping_y, visibility_rect.Max.y)
            end
        end
        window.Pos.x = ImTrunc(window.Pos.x) window.Pos.y = ImTrunc(window.Pos.y)

        local want_focus = false
        if (window_just_activated_by_user and bit32.band(flags, ImGuiWindowFlags.NoFocusOnAppearing) == 0) then
            if bit32.band(flags, ImGuiWindowFlags.Popup) ~= 0 then
                want_focus = true
            elseif (window.DockIsActive or bit32.band(flags, ImGuiWindowFlags.ChildWindow) == 0) and bit32.band(flags, ImGuiWindowFlags.Tooltip) == 0 then
                want_focus = true
            end
        end

        if bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 and not window.DockIsActive then
            window.WindowRounding = style.ChildRounding
        elseif window.RootWindowDockTree.ViewportOwned then
            window.WindowRounding = 0.0
        else
            if (bit32.band(flags, ImGuiWindowFlags.Popup) ~= 0 and bit32.band(flags, ImGuiWindowFlags.Modal) == 0) then
                window.WindowRounding = style.PopupRounding
            else
                window.WindowRounding = style.WindowRounding
            end
        end

        local handle_borders_and_resize_grips = (window.DockNodeAsHost ~= nil or not window.DockIsActive)
        if bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 and window.ParentWindow.SkipItems then
            handle_borders_and_resize_grips = false
        end

        local border_hovered, border_held = -1, -1
        local resize_grip_col = {0, 0, 0, 0}

        local resize_grip_count
        if (bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0) and (bit32.band(flags, ImGuiWindowFlags.Popup) == 0) then
            if (bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeX) ~= 0) and (bit32.band(window.ChildFlags, ImGuiChildFlags.ResizeY) ~= 0) then
                resize_grip_count = 1
            else
                resize_grip_count = 0
            end
        else
            resize_grip_count = g.IO.ConfigWindowsResizeFromEdges and 2 or 1  -- Allow resize from lower-left if we have the mouse cursor feedback for it.
        end

        local resize_grip_draw_size = ImTrunc(ImMax(g.FontSize * 1.10, g.Style.WindowRounding + 1.0 + g.FontSize * 0.2))
        if handle_borders_and_resize_grips and not window.Collapsed then
            local auto_fit_mask
            auto_fit_mask, border_hovered, border_held = UpdateWindowManualResize(window, resize_grip_count, resize_grip_col, visibility_rect)
            if auto_fit_mask ~= 0 then
                if bit32.band(auto_fit_mask, bit32.lshift(1, ImGuiAxis.X - 1)) ~= 0 then
                    use_current_size_for_scrollbar_x = true
                end
                if bit32.band(auto_fit_mask, bit32.lshift(1, ImGuiAxis.Y - 1)) ~= 0 then
                    use_current_size_for_scrollbar_y = true
                end
            end
        end
        window.ResizeBorderHovered = border_hovered
        window.ResizeBorderHeld = border_held

        -- Synchronize window --> viewport again and one last time (clamping and manual resize may have affected either)
        if window.ViewportOwned then
            if not window.Viewport.PlatformRequestMove then
                ImVec2_Copy(window.Viewport.Pos, window.Pos)
            end
            if not window.Viewport.PlatformRequestResize then
                ImVec2_Copy(window.Viewport.Size, window.Size)
            end
            window.Viewport:UpdateWorkRect()
            viewport_rect = window.Viewport:GetMainRect()
        end

        -- Save last known viewport position within the window itself (so it can be saved in .ini file and restored)
        ImVec2_Copy(window.ViewportPos, window.Viewport.Pos)

        --- SCROLLBAR VISIBILITY
        -- Update scrollbar visibility (based on the Size that was effective during last frame or the auto-resized Size)
        if not window.Collapsed then
            -- When reading the current size we need to read it after size constraints have been applied.
            -- Intentionally use previous frame values for InnerRect and ScrollbarSizes.
            -- And when we use window.DecoOuterSizeY1 here it doesn't have ScrollbarSizes.y applied yet.
            local avail_size_from_current_frame = ImVec2(window.SizeFull.x, window.SizeFull.y - (window.DecoOuterSizeY1 + window.DecoOuterSizeY2))
            local avail_size_from_last_frame = window.InnerRect:GetSize() + scrollbar_sizes_from_last_frame
            local needed_size_from_last_frame = window_just_created and ImVec2(0, 0) or window.ContentSize + window.WindowPadding * 2.0

            local size_for_scrollbars_x = use_current_size_for_scrollbar_x and avail_size_from_current_frame.x or avail_size_from_last_frame.x
            local size_for_scrollbars_y = use_current_size_for_scrollbar_y and avail_size_from_current_frame.y or avail_size_from_last_frame.y

            local scrollbar_x_prev = window.ScrollbarX
            -- local scrollbar_y_from_last_frame = window.ScrollbarY -- FIXME: May want to use that in the ScrollbarX expression? How many pros vs cons?

            window.ScrollbarY = (bit32.band(flags, ImGuiWindowFlags.AlwaysVerticalScrollbar) ~= 0) or ((needed_size_from_last_frame.y > size_for_scrollbars_y) and not (bit32.band(flags, ImGuiWindowFlags.NoScrollbar) ~= 0))
            window.ScrollbarX = (bit32.band(flags, ImGuiWindowFlags.AlwaysHorizontalScrollbar) ~= 0) or ((needed_size_from_last_frame.x > size_for_scrollbars_x - (window.ScrollbarY and style.ScrollbarSize or 0.0)) and not (bit32.band(flags, ImGuiWindowFlags.NoScrollbar) ~= 0) and (bit32.band(flags, ImGuiWindowFlags.HorizontalScrollbar) ~= 0))

            -- Track when ScrollbarX visibility keeps toggling, which is a sign of a feedback loop, and stabilize by enforcing visibility (#3285, #8488)
            -- (Feedback loops of this sort can manifest in various situations, but combining horizontal + vertical scrollbar + using a clipper with varying width items is one frequent cause.
            --  The better solution is to, either (1) enforce visibility by using ImGuiWindowFlags.AlwaysHorizontalScrollbar or (2) declare stable contents width with SetNextWindowContentSize(), if you can compute it)
            window.ScrollbarXStabilizeToggledHistory = bit32.lshift(window.ScrollbarXStabilizeToggledHistory, 1)
            if scrollbar_x_prev ~= window.ScrollbarX then
                window.ScrollbarXStabilizeToggledHistory = bit32.bor(window.ScrollbarXStabilizeToggledHistory, 0x01)
            end

            local scrollbar_x_stabilize = (window.ScrollbarXStabilizeToggledHistory ~= 0) and ImCountSetBits(window.ScrollbarXStabilizeToggledHistory) >= 4 -- 4 == half of bits in our U8 history.
            if scrollbar_x_stabilize then
                window.ScrollbarX = true
            end

            -- if scrollbar_x_stabilize and not window.ScrollbarXStabilizeEnabled then
            --     IMGUI_DEBUG_LOG("[scroll] Stabilize ScrollbarX for Window '%s'\n", window.Name)
            -- end
            window.ScrollbarXStabilizeEnabled = scrollbar_x_stabilize

            if window.ScrollbarX and not window.ScrollbarY then
                window.ScrollbarY = (needed_size_from_last_frame.y > size_for_scrollbars_y - style.ScrollbarSize) and not (bit32.band(flags, ImGuiWindowFlags.NoScrollbar) ~= 0)
            end

            window.ScrollbarSizes = ImVec2(window.ScrollbarY and style.ScrollbarSize or 0.0, window.ScrollbarX and style.ScrollbarSize or 0.0)

            -- Amend the partially filled window.DecoOuterSizeX2 values.
            window.DecoOuterSizeX2 = window.DecoOuterSizeX2 + window.ScrollbarSizes.x
            window.DecoOuterSizeY2 = window.DecoOuterSizeY2 + window.ScrollbarSizes.y
        end

        local host_rect
        if (bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 and bit32.band(flags, ImGuiWindowFlags.Popup) == 0 and not window_is_child_tooltip) then
            host_rect = parent_window.ClipRect
        else
            host_rect = viewport_rect
        end
        local outer_rect = window:Rect()
        local title_bar_rect = window:TitleBarRect()
        ImRect_Copy(window.OuterRectClipped, outer_rect)
        if window.DockIsActive then
            window.OuterRectClipped.Min.y = window.OuterRectClipped.Min.y + window.TitleBarHeight
        end
        window.OuterRectClipped:ClipWith(host_rect)

        window.InnerRect.Min.x = window.Pos.x + window.DecoOuterSizeX1
        window.InnerRect.Min.y = window.Pos.y + window.DecoOuterSizeY1
        window.InnerRect.Max.x = window.Pos.x + window.Size.x - window.DecoOuterSizeX2
        window.InnerRect.Max.y = window.Pos.y + window.Size.y - window.DecoOuterSizeY2

        local top_border_size = ((bit32.band(flags, ImGuiWindowFlags.MenuBar) ~= 0 or bit32.band(flags, ImGuiWindowFlags.NoTitleBar) == 0) and style.FrameBorderSize or window.WindowBorderSize)

        window.InnerClipRect.Min.x = ImFloor(0.5 + window.InnerRect.Min.x + window.WindowBorderSize * 0.5)
        window.InnerClipRect.Min.y = ImFloor(0.5 + window.InnerRect.Min.y + top_border_size * 0.5)
        window.InnerClipRect.Max.x = ImFloor(window.InnerRect.Max.x - window.WindowBorderSize * 0.5)
        window.InnerClipRect.Max.y = ImFloor(window.InnerRect.Max.y - window.WindowBorderSize * 0.5)
        window.InnerClipRect:ClipWithFull(host_rect)

        --- Scrolling
        -- Lock down maximum scrolling
        -- The value of ScrollMax are ahead from ScrollbarX/ScrollbarY which is intentionally using InnerRect from previous rect in order to accommodate
        -- for right/bottom aligned items without creating a scrollbar.
        window.ScrollMax.x = ImMax(0.0, window.ContentSize.x + window.WindowPadding.x * 2.0 - window.InnerRect:GetWidth())
        window.ScrollMax.y = ImMax(0.0, window.ContentSize.y + window.WindowPadding.y * 2.0 - window.InnerRect:GetHeight())

        -- Apply scrolling
        ImVec2_Copy(window.Scroll, CalcNextScrollFromScrollTargetAndClamp(window))
        ImVec2_CopyV(window.ScrollTarget, FLT_MAX, FLT_MAX)
        window.DecoInnerSizeX1 = 0.0; window.DecoInnerSizeY1 = 0.0

        IM_ASSERT(window.DrawList.CmdBuffer.Size == 1 and window.DrawList.CmdBuffer.Data[1].ElemCount == 0)
        window.DrawList:PushTexture(g.Font.OwnerAtlas.TexRef)
        ImGui.PushClipRect(host_rect.Min, host_rect.Max, false)

        local is_undocked_or_docked_visible = not window.DockIsActive or window.DockTabIsVisible
        if is_undocked_or_docked_visible then
            local render_decorations_in_parent = false
            if (bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0) and (bit32.band(flags, ImGuiWindowFlags.Popup) == 0) and not window_is_child_tooltip then
                -- - We test overlap with the previous child window only (testing all would end up being O(log N) not a good investment here)
                -- - We disable this when the parent window has zero vertices, which is a common pattern leading to laying out multiple overlapping childs
                local previous_child
                if parent_window.DC.ChildWindows.Size >= 2 then
                    previous_child = parent_window.DC.ChildWindows.Data[parent_window.DC.ChildWindows.Size - 1]
                else
                    previous_child = nil
                end
                local previous_child_overlapping
                if previous_child ~= nil then
                    previous_child_overlapping = previous_child:Rect():Overlaps(window:Rect())
                else
                    previous_child_overlapping = false
                end
                local parent_is_empty = (parent_window.DrawList.VtxBuffer.Size == 0)
                if (window.DrawList.CmdBuffer:back().ElemCount == 0 and not parent_is_empty and not previous_child_overlapping) then
                    render_decorations_in_parent = true
                end
            end

            if render_decorations_in_parent then
                window.DrawList = parent_window.DrawList
            end

            local window_to_highlight = g.NavWindowingTarget or g.NavWindow
            local title_bar_is_highlight = want_focus or (window_to_highlight ~= nil and (window.RootWindowForTitleBarHighlight == window_to_highlight.RootWindowForTitleBarHighlight or (window.DockNode ~= nil and window.DockNode == window_to_highlight.DockNode)))

            RenderWindowDecorations(window, title_bar_rect, title_bar_is_highlight, handle_borders_and_resize_grips, resize_grip_col, resize_grip_draw_size)

            if render_decorations_in_parent then
                window.DrawList = window.DrawListInst
            end
        end

        local allow_scrollbar_x = (bit32.band(flags, ImGuiWindowFlags.NoScrollbar) == 0) and (bit32.band(flags, ImGuiWindowFlags.HorizontalScrollbar) ~= 0)
        local allow_scrollbar_y = (bit32.band(flags, ImGuiWindowFlags.NoScrollbar) == 0)

        local work_rect_size_x
        if window.ContentSizeExplicit.x ~= 0.0 then
            work_rect_size_x = window.ContentSizeExplicit.x
        else
            local content_size_x = allow_scrollbar_x and (window.ContentSize and window.ContentSize.x or 0.0) or 0.0
            local window_size_x = window.Size.x - window.WindowPadding.x * 2.0 - (window.DecoOuterSizeX1 + window.DecoOuterSizeX2)
            work_rect_size_x = ImMax(content_size_x, window_size_x)
        end

        local work_rect_size_y
        if window.ContentSizeExplicit.y ~= 0.0 then
            work_rect_size_y = window.ContentSizeExplicit.y
        else
            local content_size_y = allow_scrollbar_y and (window.ContentSize and window.ContentSize.y or 0.0) or 0.0
            local window_size_y = window.Size.y - window.WindowPadding.y * 2.0 - (window.DecoOuterSizeY1 + window.DecoOuterSizeY2)
            work_rect_size_y = ImMax(content_size_y, window_size_y)
        end

        window.WorkRect.Min.x = ImTrunc(window.InnerRect.Min.x - window.Scroll.x + ImMax(window.WindowPadding.x, window.WindowBorderSize))
        window.WorkRect.Min.y = ImTrunc(window.InnerRect.Min.y - window.Scroll.y + ImMax(window.WindowPadding.y, window.WindowBorderSize))
        window.WorkRect.Max.x = window.WorkRect.Min.x + work_rect_size_x
        window.WorkRect.Max.y = window.WorkRect.Min.y + work_rect_size_y
        window.ParentWorkRect = window.WorkRect

        -- [LEGACY] Content Region
        -- FIXME-OBSOLETE: window->ContentRegionRect.Max is currently very misleading / partly faulty, but some BeginChild() patterns relies on it.
        -- Unless explicit content size is specified by user, this currently represent the region leading to no scrolling.
        -- Used by:
        -- - Mouse wheel scrolling + many other things
        window.ContentRegionRect.Min.x = window.Pos.x - window.Scroll.x + window.WindowPadding.x + window.DecoOuterSizeX1
        window.ContentRegionRect.Min.y = window.Pos.y - window.Scroll.y + window.WindowPadding.y + window.DecoOuterSizeY1
        window.ContentRegionRect.Max.x = window.ContentRegionRect.Min.x + (window.ContentSizeExplicit.x ~= 0.0 and window.ContentSizeExplicit.x or (window.Size.x - window.WindowPadding.x * 2.0 - (window.DecoOuterSizeX1 + window.DecoOuterSizeX2)))
        window.ContentRegionRect.Max.y = window.ContentRegionRect.Min.y + (window.ContentSizeExplicit.y ~= 0.0 and window.ContentSizeExplicit.y or (window.Size.y - window.WindowPadding.y * 2.0 - (window.DecoOuterSizeY1 + window.DecoOuterSizeY2)))

        -- Setup drawing context
        -- (NB: That term "drawing context / DC" lost its meaning a long time ago. Initially was meant to hold transient data only. Nowadays difference between window-> and window->DC-> is dubious.)
        window.DC.Indent.x = window.DecoOuterSizeX1 + window.WindowPadding.x - window.Scroll.x
        window.DC.GroupOffset.x = 0.0
        window.DC.ColumnsOffset.x = 0.0

        -- Record the loss of precision of CursorStartPos which can happen due to really large scrolling amount.
        -- This is used by clipper to compensate and fix the most common use case of large scroll area. Easy and cheap, next best thing compared to switching everything to double or ImU64.
        local start_pos_highp_x = window.Pos.x + window.WindowPadding.x - window.Scroll.x + window.DecoOuterSizeX1 + window.DC.ColumnsOffset.x
        local start_pos_highp_y = window.Pos.y + window.WindowPadding.y - window.Scroll.y + window.DecoOuterSizeY1
        ImVec2_CopyV(window.DC.CursorStartPos, start_pos_highp_x, start_pos_highp_y)
        ImVec2_CopyV(window.DC.CursorStartPosLossyness, start_pos_highp_x - window.DC.CursorStartPos.x, start_pos_highp_y - window.DC.CursorStartPos.y)
        ImVec2_Copy(window.DC.CursorPos, window.DC.CursorStartPos)
        ImVec2_Copy(window.DC.CursorPosPrevLine, window.DC.CursorPos)
        ImVec2_Copy(window.DC.CursorMaxPos, window.DC.CursorStartPos)
        ImVec2_Copy(window.DC.IdealMaxPos, window.DC.CursorStartPos)
        ImVec2_CopyV(window.DC.CurrLineSize, 0.0, 0.0)
        ImVec2_CopyV(window.DC.PrevLineSize, 0.0, 0.0)
        window.DC.CurrLineTextBaseOffset = 0.0
        window.DC.PrevLineTextBaseOffset = 0.0
        window.DC.IsSameLine = false
        window.DC.IsSetPos = false

        window.DC.NavLayerCurrent = ImGuiNavLayer.Main
        window.DC.NavLayersActiveMask = window.DC.NavLayersActiveMaskNext
        window.DC.NavLayersActiveMaskNext = 0x00
        window.DC.NavIsScrollPushableX = true
        window.DC.NavHideHighlightOneFrame = false
        window.DC.NavWindowHasScrollY = window.ScrollMax.y > 0.0

        window.DC.MenuBarAppending = false
        window.DC.MenuColumns:Update(style.ItemSpacing.x, window_just_activated_by_user)
        window.DC.TreeDepth = 0
        window.DC.TreeHasStackDataDepthMask = 0x00
        window.DC.TreeRecordsClippedNodesY2Mask = 0x00
        window.DC.ChildWindows:resize(0)
        window.DC.StateStorage = window.StateStorage
        window.DC.CurrentColumns = nil
        window.DC.LayoutType = ImGuiLayoutType.Vertical
        window.DC.ParentLayoutType = (parent_window ~= nil) and parent_window.DC.LayoutType or ImGuiLayoutType.Vertical

        -- Default item width. Make it proportional to window size if window can be manually resized.
        -- (we cannot use AutoFitFramesX/AutoFitFramesY which is a temporary state)
        local is_resizable_width
        if bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 and not window.DockIsActive then
            is_resizable_width = (window.Size.x > 0.0) and (bit32.band(window.ChildFlags, bit32.bor(ImGuiChildFlags.AutoResizeX, ImGuiChildFlags.AlwaysAutoResize)) == 0)
        else
            is_resizable_width = (window.Size.x > 0.0) and (bit32.band(flags, ImGuiWindowFlags.AlwaysAutoResize) == 0)
        end

        if is_resizable_width then
            window.DC.ItemWidthDefault = ImTrunc(window.Size.x * 0.65)
        else
            window.DC.ItemWidthDefault = ImTrunc(g.FontSize * 16.0)
        end
        window.DC.ItemWidth = window.DC.ItemWidthDefault
        window.DC.ItemWidthStack:resize(0)
        window.DC.TextWrapPos = -1.0
        window.DC.TextWrapPosStack:resize(0)
        if bit32.band(flags, ImGuiWindowFlags.Modal) ~= 0 then
            window.DC.ModalDimBgColor = ImGui.ColorConvertFloat4ToU32(ImGui.GetStyleColorVec4(ImGuiCol.ModalWindowDimBg))
        end

        if window.AutoFitFramesX > 0 then
            window.AutoFitFramesX = window.AutoFitFramesX - 1
        end
        if window.AutoFitFramesY > 0 then
            window.AutoFitFramesY = window.AutoFitFramesY - 1
        end

        g.NextWindowData:ClearFlags()

        if want_focus then
            ImGui.FocusWindow(window, ImGuiFocusRequestFlags.UnlessBelowModal)
        end
        if want_focus and window == g.NavWindow then
            ImGui.NavInitWindow(window, false)
        end

        -- Pressing Ctrl+C copy window content into the clipboard
        if g.IO.ConfigWindowsCopyContentsWithCtrlC then
            if g.NavWindow and g.NavWindow.RootWindow == window and g.ActiveId == 0 and ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.C)) then
                ImGui.LogToClipboard(0)
            end
        end

        if bit32.band(flags, ImGuiWindowFlags.NoTitleBar) == 0 and not window.DockIsActive then
            open = RenderWindowTitleBarContents(window, ImRect(title_bar_rect.Min.x + window.WindowBorderSize, title_bar_rect.Min.y, title_bar_rect.Max.x - window.WindowBorderSize, title_bar_rect.Max.y), name, open)
        elseif bit32.band(flags, ImGuiWindowFlags.NoTitleBar) == 0 and window.DockIsActive then
            ImGui.LogText("%s\n", string.sub(window.Name, 1, ImGui.FindRenderedTextEnd(window.Name) - 1))
        end

        -- Clear hit test shape every frame
        window.HitTestHoleSize.x = 0; window.HitTestHoleSize.y = 0

        if bit32.band(flags, ImGuiWindowFlags.Tooltip) ~= 0 then
            g.TooltipPreviousWindow = window
        end

        if bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.DockingEnable) ~= 0 then
            -- Docking: Dragging a dockable window (or any of its child) turns it into a drag and drop source.
            -- We need to do this _before_ we overwrite window->DC.LastItemId below because BeginDockableDragDropSource() also overwrites it.
            if g.MovingWindow == window and bit32.band(window.RootWindowDockTree.Flags, ImGuiWindowFlags.NoDocking) == 0 then
                ImGui.BeginDockableDragDropSource(window)
            end

            -- Docking: Any dockable window can act as a target. For dock node hosts we call BeginDockableDragDropTarget() in DockNodeUpdate() instead.
            if g.DragDropActive and bit32.band(flags, ImGuiWindowFlags.NoDocking) == 0 then
                if g.MovingWindow == nil or g.MovingWindow.RootWindowDockTree ~= window then
                    if window == window.RootWindowDockTree and bit32.band(window.Flags, ImGuiWindowFlags.DockNodeHost) == 0 then
                        ImGui.BeginDockableDragDropTarget(window)
                    end
                end
            end
        end

        if bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
            window.BgClickFlags = parent_window.BgClickFlags
        else
            window.BgClickFlags = g.IO.ConfigWindowsMoveFromTitleBarOnly and ImGuiWindowBgClickFlags.None or ImGuiWindowBgClickFlags.Move
        end

        window.DC.WindowItemStatusFlags = ImGuiItemStatusFlags.None

        if ImGui.IsMouseHoveringRect(title_bar_rect.Min, title_bar_rect.Max, false) then
            window.DC.WindowItemStatusFlags = bit32.bor(window.DC.WindowItemStatusFlags, ImGuiItemStatusFlags.HoveredRect)
        end
        ImGui.SetLastItemDataForWindow(window, title_bar_rect)
    else
        if (window.SkipRefresh) then
            SetWindowActiveForSkipRefresh(window)
        end

        ImGui.SetCurrentViewport(window, window.Viewport)
        SetCurrentWindow(window)
        g.NextWindowData:ClearFlags()
        ImGui.SetLastItemDataForWindow(window, window:TitleBarRect())
    end

    if bit32.band(flags, ImGuiWindowFlags.DockNodeHost) == 0 and not window.SkipRefresh then
        ImGui.PushClipRect(window.InnerClipRect.Min, window.InnerClipRect.Max, true)
    end

    window.WriteAccessed = false
    window.BeginCount = window.BeginCount + 1
    g.NextWindowData:ClearFlags()

    if first_begin_of_the_frame and not window.SkipRefresh then
        -- When we are about to select this tab (which will only be visible on the _next frame_), flag it with a non-zero HiddenFramesCannotSkipItems.
        if window.DockIsActive and not window.DockTabIsVisible then
            if window.LastFrameJustFocused == g.FrameCount then
                window.HiddenFramesCannotSkipItems = 1
            else
                window.HiddenFramesCanSkipItems = 1
            end
        end

        if (bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0) and (bit32.band(flags, ImGuiWindowFlags.ChildMenu) == 0) then
            -- Child window can be out of sight and have "negative" clip windows.
            -- Mark them as collapsed so commands are skipped earlier (we can't manually collapse them because they have no title bar).
            IM_ASSERT((bit32.band(flags, ImGuiWindowFlags.NoTitleBar) ~= 0) or window.DockIsActive)

            local nav_request = (bit32.band(window.ChildFlags, ImGuiChildFlags.NavFlattened) ~= 0) and (g.NavAnyRequest and g.NavWindow and g.NavWindow.RootWindowForNav == window.RootWindowForNav)

            if not g.LogEnabled and not nav_request then
                if window.OuterRectClipped.Min.x >= window.OuterRectClipped.Max.x or window.OuterRectClipped.Min.y >= window.OuterRectClipped.Max.y then
                    if window.AutoFitFramesX > 0 or window.AutoFitFramesY > 0 then
                        window.HiddenFramesCannotSkipItems = 1
                    else
                        window.HiddenFramesCanSkipItems = 1
                    end
                end
            end

            -- Hide along with parent or if parent is collapsed
            if parent_window and (parent_window.Collapsed or parent_window.HiddenFramesCanSkipItems > 0) then
                window.HiddenFramesCanSkipItems = 1
            end
            if parent_window and parent_window.HiddenFramesCannotSkipItems > 0 then
                window.HiddenFramesCannotSkipItems = 1
            end
        end

        if style.Alpha <= 0.0 then
            window.HiddenFramesCanSkipItems = 1
        end

        local hidden_regular = (window.HiddenFramesCanSkipItems > 0) or (window.HiddenFramesCannotSkipItems > 0)
        window.Hidden = hidden_regular or (window.HiddenFramesForRenderOnly > 0)

        -- Disable inputs for requested number of frames
        if window.DisableInputsFrames > 0 then
            window.DisableInputsFrames = window.DisableInputsFrames - 1
            window.Flags = bit32.bor(window.Flags, ImGuiWindowFlags.NoInputs)
        end

        -- Update the SkipItems flag, used to early out of all items functions (no layout required)
        local skip_items = false
        if window.Collapsed or not window.Active or hidden_regular then
            if window.AutoFitFramesX <= 0 and window.AutoFitFramesY <= 0 and window.HiddenFramesCannotSkipItems <= 0 then
                skip_items = true
            end
        end
        window.SkipItems = skip_items

        -- Restore NavLayersActiveMaskNext to previous value when not visible, so a CTRL+Tab back can use a safe value.
        if window.SkipItems then
            window.DC.NavLayersActiveMaskNext = window.DC.NavLayersActiveMask
        end
    elseif first_begin_of_the_frame then
        window.SkipItems = true
    end

    if open == nil then open = true end
    return open, not window.SkipItems
end

function ImGui.End()
    local g = GImGui
    local window = g.CurrentWindow

    if (g.CurrentWindowStack.Size <= 1 and g.WithinFrameScopeWithImplicitWindow) then
        IM_ASSERT_USER_ERROR(g.CurrentWindowStack.Size > 1, "Calling End() too many times!")

        return
    end
    local window_stack_data = g.CurrentWindowStack:back()

    if bit32.band(window.Flags, ImGuiWindowFlags.Popup) ~= 0 then
        IM_ASSERT_USER_ERROR(g.WithinEndPopupID == window.ID, "Must call EndPopup() and not End()!")
    end
    if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 and bit32.band(window.Flags, ImGuiWindowFlags.DockNodeHost) == 0 and not window.DockIsActive then
        IM_ASSERT_USER_ERROR(g.WithinEndChildID == window.ID, "Must call EndChild() and not End()!")
    end

    if window.DC.CurrentColumns then
        ImGui.EndColumns()
    end
    if bit32.band(window.Flags, ImGuiWindowFlags.DockNodeHost) == 0 and not window.SkipRefresh then
        ImGui.PopClipRect()
    end
    ImGui.PopFocusScope()

    if window_stack_data.DisabledOverrideReenable and window.RootWindow == window then
        ImGui.EndDisabledOverrideReenable()
    end

    if (window.SkipRefresh) then
        IM_ASSERT(window.DrawList == nil)
        window.DrawList = window.DrawListInst
    end

    -- Stop logging
    if g.LogWindow == window then -- FIXME: add more options for scope of logging
        ImGui.LogFinish()
    end

    if window.DC.IsSetPos then
        ImGui.ErrorCheckUsingSetCursorPosToExtendParentBoundaries()
    end

    -- Docking: report contents sizes to parent to allow for auto-resize
    if window.DockNode and window.DockTabIsVisible then
        local host_window = window.DockNode.HostWindow
        if host_window then
            ImVec2_Copy(host_window.DC.CursorMaxPos, window.DC.CursorMaxPos + window.WindowPadding - host_window.WindowPadding)
        end
    end

    -- Pop from window stack
    ImGuiLastItemData_Copy(g.LastItemData, window_stack_data.ParentLastItemDataBackup)
    if bit32.band(window.Flags, ImGuiWindowFlags.ChildMenu) ~= 0 then
        g.BeginMenuDepth = g.BeginMenuDepth - 1
    end
    if bit32.band(window.Flags, ImGuiWindowFlags.Popup) ~= 0 then
        g.BeginPopupStack:pop_back()
    end

    -- Error handling, state recovery
    if g.IO.ConfigErrorRecovery and window_stack_data.StackSizesInBegin then
        ImGui.ErrorRecoveryTryToRecoverWindowState(window_stack_data.StackSizesInBegin)
    end

    g.CurrentWindowStack:pop_back()

    -- LUA: No "Ternary Operator", since lua (... and (1) or (2)) will eval (1) and (2) no matter what
    -- so something like `SetCurrentWindow((g.CurrentWindowStack.Size == 0) and nil or g.CurrentWindowStack:back().Window)` will error
    if (g.CurrentWindowStack.Size == 0) then
        SetCurrentWindow(nil)
    else
        SetCurrentWindow(g.CurrentWindowStack:back().Window)
    end
    if g.CurrentWindow then
        ImGui.SetCurrentViewport(g.CurrentWindow, g.CurrentWindow.Viewport)
    end
end

--- @param option  ImGuiItemFlags
--- @param enabled bool
function ImGui.PushItemFlag(option, enabled)
    local g = GImGui
    local item_flags = g.CurrentItemFlags
    IM_ASSERT(item_flags == g.ItemFlagsStack:back())

    if enabled then
        item_flags = bit32.bor(item_flags, option)
    else
        item_flags = bit32.band(item_flags, bit32.bnot(option))
    end

    g.CurrentItemFlags = item_flags
    g.ItemFlagsStack:push_back(item_flags)
end

function ImGui.PopItemFlag()
    local g = GImGui
    IM_ASSERT_USER_ERROR_RET(g.ItemFlagsStack.Size > 1, "Calling PopItemFlag() too many times!")
    g.ItemFlagsStack:pop_back()
    g.CurrentItemFlags = g.ItemFlagsStack:back()
end

--- @param disabled? bool
function ImGui.BeginDisabled(disabled)
    if disabled == nil then disabled = true end

    local g = GImGui
    local was_disabled = bit32.band(g.CurrentItemFlags, ImGuiItemFlags.Disabled) ~= 0
    if not was_disabled and disabled then
        g.DisabledAlphaBackup = g.Style.Alpha
        g.Style.Alpha = g.Style.Alpha * g.Style.DisabledAlpha
    end
    if was_disabled or disabled then
        g.CurrentItemFlags = bit32.bor(g.CurrentItemFlags, ImGuiItemFlags.Disabled)
    end
    g.ItemFlagsStack:push_back(g.CurrentItemFlags)
    g.DisabledStackSize = g.DisabledStackSize + 1
end

function ImGui.EndDisabled()
    local g = GImGui
    IM_ASSERT_USER_ERROR_RET(g.DisabledStackSize > 0, "Calling EndDisabled() too many times!")
    g.DisabledStackSize = g.DisabledStackSize - 1
    local was_disabled = bit32.band(g.CurrentItemFlags, ImGuiItemFlags.Disabled) ~= 0
    g.ItemFlagsStack:pop_back()
    g.CurrentItemFlags = g.ItemFlagsStack:back()
    if was_disabled and bit32.band(g.CurrentItemFlags, ImGuiItemFlags.Disabled) == 0 then
        g.Style.Alpha = g.DisabledAlphaBackup
    end
end

function ImGui.BeginDisabledOverrideReenable()
    local g = GImGui
    IM_ASSERT(bit32.band(g.CurrentItemFlags, ImGuiItemFlags.Disabled) ~= 0)

    g.CurrentWindowStack.Data[g.CurrentWindowStack.Size].DisabledOverrideReenableAlphaBackup = g.Style.Alpha
    g.Style.Alpha = g.DisabledAlphaBackup
    g.CurrentItemFlags = bit32.band(g.CurrentItemFlags, bit32.bnot(ImGuiItemFlags.Disabled))
    g.ItemFlagsStack:push_back(g.CurrentItemFlags)
    g.DisabledStackSize = g.DisabledStackSize + 1
end

function ImGui.EndDisabledOverrideReenable()
    local g = GImGui
    IM_ASSERT(g.DisabledStackSize > 0)
    g.DisabledStackSize = g.DisabledStackSize - 1
    g.ItemFlagsStack:pop_back()
    g.CurrentItemFlags = g.ItemFlagsStack:back()
    g.Style.Alpha = g.CurrentWindowStack:back().DisabledOverrideReenableAlphaBackup
end

--- @param pos                            ImVec2
--- @param find_first_and_in_any_viewport bool
--- @return ImGuiWindow, ImGuiWindow?
local function FindHoveredWindowEx(pos, find_first_and_in_any_viewport)
    local g = GImGui
    local hovered_window = nil
    local hovered_window_under_moving_window = nil

    -- Special handling for the window being moved: Ignore the mouse viewport check (because it may reset/lose its viewport during the undocking frame)
    hovered_window = g.MovingWindow
    local backup_moving_window_viewport = nil
    if (find_first_and_in_any_viewport == false and g.MovingWindow) then
        backup_moving_window_viewport = g.MovingWindow.Viewport
        g.MovingWindow.Viewport = g.MouseViewport
        if (bit32.band(g.MovingWindow.Flags, ImGuiWindowFlags.NoMouseInputs) == 0) then
            hovered_window = g.MovingWindow
        end
    end

    local padding_regular = g.Style.TouchExtraPadding
    local padding_for_resize = ImMax(g.Style.TouchExtraPadding, ImVec2(g.Style.WindowBorderHoverPadding, g.Style.WindowBorderHoverPadding))

    local window
    local stop_6075 = false
    for i = g.Windows.Size, 1, -1 do
        repeat
        window = g.Windows.Data[i]
        if not window.WasActive or window.Hidden then
            break
        end
        if bit32.band(window.Flags, ImGuiWindowFlags.NoMouseInputs) ~= 0 then
            break
        end

        IM_ASSERT(window.Viewport)
        if (window.Viewport ~= g.MouseViewport) then
            break
        end
        local hit_padding
        if bit32.band(window.Flags, bit32.bor(ImGuiWindowFlags.NoResize, ImGuiWindowFlags.AlwaysAutoResize)) ~= 0 then
            hit_padding = padding_regular
        else
            hit_padding = padding_for_resize
        end
        if not window.OuterRectClipped:ContainsWithPad(pos, hit_padding) then
            break
        end

        if window.HitTestHoleSize.x ~= 0 then
            -- TODO: hit test hole
        end

        if find_first_and_in_any_viewport then
            hovered_window = window
            stop_6075 = true; break
        else
            if hovered_window == nil then
                hovered_window = window
            end

            if hovered_window_under_moving_window == nil and (not g.MovingWindow or window.RootWindowDockTree ~= g.MovingWindow.RootWindowDockTree) then
                hovered_window_under_moving_window = window
            end

            if hovered_window and hovered_window_under_moving_window then
                stop_6075 = true; break
            end
        end

        until true
        if stop_6075 then break end
    end

    if (find_first_and_in_any_viewport == false and g.MovingWindow) then
        g.MovingWindow.Viewport = backup_moving_window_viewport
    end

    return hovered_window, hovered_window_under_moving_window
end

-- TODO:
function ImGui.UpdateHoveredWindowAndCaptureFlags(mouse_pos)
    local g = GImGui
    local io = g.IO

    g.WindowsBorderHoverPadding = ImMax(ImMax(g.Style.TouchExtraPadding.x, g.Style.TouchExtraPadding.y), g.Style.WindowBorderHoverPadding)

    local clear_hovered_windows = false
    g.HoveredWindow, g.HoveredWindowUnderMovingWindow = FindHoveredWindowEx(mouse_pos, false)
    IM_ASSERT(g.HoveredWindow == nil or g.HoveredWindow == g.MovingWindow or g.HoveredWindow.Viewport == g.MouseViewport)
    g.HoveredWindowBeforeClear = g.HoveredWindow

    local modal_window = ImGui.GetTopMostPopupModal()
    if modal_window and g.HoveredWindow and not ImGui.IsWindowWithinBeginStackOf(g.HoveredWindow.RootWindow, modal_window) then
        clear_hovered_windows = true
    end

    if bit32.band(io.ConfigFlags, ImGuiConfigFlags.NoMouse) ~= 0 then
        clear_hovered_windows = true
    end

    local has_open_popup = (g.OpenPopupStack.Size > 0)
    local has_open_modal = (modal_window ~= nil)
    local mouse_earliest_down = -1
    local mouse_any_down = false

    for i = 0, 2 do -- IM_COUNTOF(io.MouseDown)
        if io.MouseClicked[i] then
            io.MouseDownOwned[i] = (g.HoveredWindow ~= nil) or has_open_popup
            io.MouseDownOwnedUnlessPopupClose[i] = (g.HoveredWindow ~= nil) or has_open_modal
        end

        mouse_any_down = mouse_any_down or io.MouseDown[i]
        if (io.MouseDown[i] or io.MouseReleased[i]) then
            if (mouse_earliest_down == -1 or (io.MouseClickedTime[i] < io.MouseClickedTime[mouse_earliest_down])) then
                mouse_earliest_down = i
            end
        end
    end

    local mouse_avail = (mouse_earliest_down == -1) or io.MouseDownOwned[mouse_earliest_down]
    local mouse_avail_unless_popup_close = (mouse_earliest_down == -1) or io.MouseDownOwnedUnlessPopupClose[mouse_earliest_down]

    local mouse_dragging_extern_payload = g.DragDropActive and bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.SourceExtern) ~= 0
    if not mouse_avail and not mouse_dragging_extern_payload then
        clear_hovered_windows = true
    end

    if clear_hovered_windows then
        g.HoveredWindow = nil
        g.HoveredWindowUnderMovingWindow = nil
    end

    if (g.WantCaptureMouseNextFrame ~= -1) then
        io.WantCaptureMouse = (g.WantCaptureMouseNextFrame ~= 0)
        io.WantCaptureMouseUnlessPopupClose = io.WantCaptureMouse
    else
        io.WantCaptureMouse = (mouse_avail and (g.HoveredWindow ~= nil or mouse_any_down)) or has_open_popup
        io.WantCaptureMouseUnlessPopupClose = (mouse_avail_unless_popup_close and (g.HoveredWindow ~= nil or mouse_any_down)) or has_open_modal
    end

    io.WantCaptureKeyboard = false
    if bit32.band(io.ConfigFlags, ImGuiConfigFlags.NoKeyboard) == 0 then
        if (g.ActiveId ~= 0) or (modal_window ~= nil) then
            io.WantCaptureKeyboard = true
        elseif io.NavActive and bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) ~= 0 and io.ConfigNavCaptureKeyboard then
            io.WantCaptureKeyboard = true
        end
    end
    if g.WantCaptureKeyboardNextFrame ~= -1 then
        io.WantCaptureKeyboard = (g.WantCaptureKeyboardNextFrame ~= 0)
    end

    io.WantTextInput = (g.WantTextInputNextFrame ~= -1) and (g.WantTextInputNextFrame ~= 0) or false
end

--- @param key          ImGuiKey
--- @param v            bool
--- @param analog_value float
function ImGui.UpdateAliasKey(key, v, analog_value)
    IM_ASSERT(ImGui.IsAliasKey(key))
    local key_data = ImGui.GetKeyData(nil, key)
    key_data.Down = v
    key_data.AnalogValue = analog_value
end

function ImGui.GetMergedModsFromKeys()
    local g = GImGui
    local mods = 0

    if ImGui.GetKeyData(g, ImGuiMod_Ctrl).Down then mods  = bit32.bor(mods, ImGuiMod_Ctrl) end
    if ImGui.GetKeyData(g, ImGuiMod_Shift).Down then mods = bit32.bor(mods, ImGuiMod_Shift) end
    if ImGui.GetKeyData(g, ImGuiMod_Alt).Down then mods   = bit32.bor(mods, ImGuiMod_Alt) end
    if ImGui.GetKeyData(g, ImGuiMod_Super).Down then mods = bit32.bor(mods, ImGuiMod_Super) end

    return mods
end

function ImGui.UpdateKeyboardInputs()
    local g = GImGui
    local io = g.IO

    if bit32.band(io.ConfigFlags, ImGuiConfigFlags.NoKeyboard) ~= 0 then
        io:ClearInputKeys()
    end

    for n = 0, 2 do -- TODO: ImGuiMouseButton.COUNT - 1
        ImGui.UpdateAliasKey(ImGui.MouseButtonToKey(n), io.MouseDown[n], io.MouseDown[n] and 1.0 or 0.0)
    end
    ImGui.UpdateAliasKey(ImGuiKey.MouseWheelX, io.MouseWheelH ~= 0.0, io.MouseWheelH)
    ImGui.UpdateAliasKey(ImGuiKey.MouseWheelY, io.MouseWheel ~= 0.0, io.MouseWheel)

    -- Synchronize io.KeyMods and io.KeyCtrl/io.KeyShift/etc. values
    local prev_key_mods = io.KeyMods
    io.KeyMods = ImGui.GetMergedModsFromKeys()
    io.KeyCtrl = bit32.band(io.KeyMods, ImGuiMod_Ctrl) ~= 0
    io.KeyShift = bit32.band(io.KeyMods, ImGuiMod_Shift) ~= 0
    io.KeyAlt = bit32.band(io.KeyMods, ImGuiMod_Alt) ~= 0
    io.KeySuper = bit32.band(io.KeyMods, ImGuiMod_Super) ~= 0
    if prev_key_mods ~= io.KeyMods then
        g.LastKeyModsChangeTime = g.Time
    end
    if prev_key_mods ~= io.KeyMods and prev_key_mods == 0 then
        g.LastKeyModsChangeFromNoneTime = g.Time
    end

    -- Clear gamepad data if disabled
    if bit32.band(io.BackendFlags, ImGuiBackendFlags.HasGamepad) == 0 then
        for key = ImGuiKey_Gamepad_BEGIN, ImGuiKey_Gamepad_END - 1 do
            io.KeysData[key - ImGuiKey.NamedKey_BEGIN].Down = false
            io.KeysData[key - ImGuiKey.NamedKey_BEGIN].AnalogValue = 0.0
        end
    end

    -- Update keys
    for key = ImGuiKey.NamedKey_BEGIN, ImGuiKey.NamedKey_END - 1 do
        local key_data = io.KeysData[key - ImGuiKey.NamedKey_BEGIN]
        key_data.DownDurationPrev = key_data.DownDuration
        if key_data.Down then
            if key_data.DownDuration < 0.0 then
                key_data.DownDuration = 0.0
            else
                key_data.DownDuration = key_data.DownDuration + io.DeltaTime
            end
        else
            key_data.DownDuration = -1.0
        end
        if key_data.DownDuration == 0.0 then
            if ImGui.IsKeyboardKey(key) then
                g.LastKeyboardKeyPressTime = g.Time
            elseif key == ImGuiKey.ReservedForModCtrl or key == ImGuiKey.ReservedForModShift or key == ImGuiKey.ReservedForModAlt or key == ImGuiKey.ReservedForModSuper then
                g.LastKeyboardKeyPressTime = g.Time
            end
        end
    end

    -- Update keys/input owner (named keys only): one entry per key
    for key = ImGuiKey.NamedKey_BEGIN, ImGuiKey.NamedKey_END - 1 do
        local key_data = io.KeysData[key - ImGuiKey.NamedKey_BEGIN]
        local owner_data = g.KeysOwnerData[key - ImGuiKey.NamedKey_BEGIN]
        owner_data.OwnerCurr = owner_data.OwnerNext
        if not key_data.Down then -- Important: ownership is released on the frame after a release. Ensure a 'MouseDown -> CloseWindow -> MouseUp' chain doesn't lead to someone else seeing the MouseUp.
            owner_data.OwnerNext = ImGuiKeyOwner_NoOwner
        end
        owner_data.LockThisFrame = owner_data.LockUntilRelease and key_data.Down
        owner_data.LockUntilRelease = owner_data.LockUntilRelease and key_data.Down  -- Clear LockUntilRelease when key is not Down anymore
    end

    ImGui.UpdateKeyRoutingTable(g.KeysRoutingTable)
end

function ImGui.UpdateMouseInputs()
    local g = GImGui
    local io = g.IO

    -- Mouse Wheel swapping flag
    -- As a standard behavior holding Shift while using Vertical Mouse Wheel triggers Horizontal scroll instead
    -- - We avoid doing it on OSX as it the OS input layer handles this already
    io.MouseWheelRequestAxisSwap = io.KeyShift and not io.ConfigMacOSXBehaviors

    -- Round mouse position to avoid spreading non-rounded position (e.g. UpdateManualResize doesn't support them well)
    if (ImGui.IsMousePosValid(io.MousePos)) then
        local x_val = ImFloor(io.MousePos.x)
        local y_val = ImFloor(io.MousePos.y)

        io.MousePos = ImVec2(x_val, y_val)
        g.MouseLastValidPos = ImVec2(x_val, y_val)
    end

    -- If mouse just appeared or disappeared (usually denoted by -FLT_MAX components) we cancel out movement in MouseDelta
    if (ImGui.IsMousePosValid(io.MousePos) and ImGui.IsMousePosValid(io.MousePosPrev)) then
        io.MouseDelta = io.MousePos - io.MousePosPrev
    else
        io.MouseDelta = ImVec2(0.0, 0.0)
    end

    -- Update stationary timer
    -- FIXME: May need to rework again to have some tolerance for occasional small movement, while being functional on high-framerates
    local mouse_stationary_threshold = (io.MouseSource == ImGuiMouseSource.Mouse) and 2.0 or 3.0
    local mouse_stationary = (ImLengthSqr(io.MouseDelta) <= mouse_stationary_threshold * mouse_stationary_threshold)
    g.MouseStationaryTimer = mouse_stationary and (g.MouseStationaryTimer + io.DeltaTime) or 0.0

    -- If mouse moved we re-enable mouse hovering in case it was disabled by keyboard/gamepad. In theory should use a >0.0 threshold but would need to reset in everywhere we set this to true.
    if io.MouseDelta.x ~= 0.0 or io.MouseDelta.y ~= 0.0 then
        g.NavHighlightItemUnderNav = false
    end

    for i = 0, 2 do -- IM_COUNTOF(io.MouseDown)
        io.MouseClicked[i] = io.MouseDown[i] and (io.MouseDownDuration[i] < 0.0)
        io.MouseClickedCount[i] = 0 -- Will be filled below
        io.MouseReleased[i] = not io.MouseDown[i] and (io.MouseDownDuration[i] >= 0.0)
        if (io.MouseReleased[i]) then
            io.MouseReleasedTime[i] = g.Time
        end
        io.MouseDownDurationPrev[i] = io.MouseDownDuration[i]
        if io.MouseDown[i] then
            if io.MouseDownDuration[i] < 0.0 then
                io.MouseDownDuration[i] = 0.0
            else
                io.MouseDownDuration[i] = io.MouseDownDuration[i] + io.DeltaTime
            end
        else
            io.MouseDownDuration[i] = -1.0
        end

        if io.MouseClicked[i] then
            local is_repeated_click = false
            if (g.Time - io.MouseClickedTime[i]) < io.MouseDoubleClickTime then
                local delta_from_click_pos
                if ImGui.IsMousePosValid(io.MousePos) then
                    delta_from_click_pos = io.MousePos - io.MouseClickedPos[i]
                else
                    delta_from_click_pos = ImVec2(0.0, 0.0)
                end

                if ImLengthSqr(delta_from_click_pos) < io.MouseDoubleClickMaxDist * io.MouseDoubleClickMaxDist then
                    is_repeated_click = true
                end
            end

            if is_repeated_click then
                io.MouseClickedLastCount[i] = io.MouseClickedLastCount[i] + 1
            else
                io.MouseClickedLastCount[i] = 1
            end

            io.MouseClickedTime[i] = g.Time
            io.MouseClickedPos[i] = io.MousePos
            io.MouseClickedCount[i] = io.MouseClickedLastCount[i]
            ImVec2_Copy(io.MouseDragMaxDistanceAbs[i], ImVec2(0.0, 0.0))
            io.MouseDragMaxDistanceSqr[i] = 0.0
        elseif io.MouseDown[i] then
            -- Maintain the maximum distance we reaching from the initial click position, which is used with dragging threshold
            local delta_from_click_pos
            if ImGui.IsMousePosValid(io.MousePos) then
                delta_from_click_pos = (io.MousePos - io.MouseClickedPos[i])
            else
                delta_from_click_pos = ImVec2(0.0, 0.0)
            end
            io.MouseDragMaxDistanceSqr[i] = ImMax(io.MouseDragMaxDistanceSqr[i], ImLengthSqr(delta_from_click_pos))
            io.MouseDragMaxDistanceAbs[i].x = ImMax(io.MouseDragMaxDistanceAbs[i].x, (delta_from_click_pos.x < 0.0) and -delta_from_click_pos.x or delta_from_click_pos.x)
            io.MouseDragMaxDistanceAbs[i].y = ImMax(io.MouseDragMaxDistanceAbs[i].y, (delta_from_click_pos.y < 0.0) and -delta_from_click_pos.y or delta_from_click_pos.y)
        end

        io.MouseDoubleClicked[i] = (io.MouseClickedCount[i] == 2)

        if (io.MouseClicked[i]) then
            g.NavHighlightItemUnderNav = false
        end
    end
end

--- @param window?      ImGuiWindow
--- @param wheel_amount float
local function LockWheelingWindow(window, wheel_amount)
    local g = GImGui
    if window then
        g.WheelingWindowReleaseTimer = ImMin(g.WheelingWindowReleaseTimer + ImAbs(wheel_amount) * WINDOWS_MOUSE_WHEEL_SCROLL_LOCK_TIMER, WINDOWS_MOUSE_WHEEL_SCROLL_LOCK_TIMER)
    else
        g.WheelingWindowReleaseTimer = 0.0
    end
    if (g.WheelingWindow == window) then
        return
    end
    -- IMGUI_DEBUG_LOG_IO("[io] LockWheelingWindow() \"%s\"\n", window ? window->Name : "NULL")
    g.WheelingWindow = window
    ImVec2_Copy(g.WheelingWindowRefMousePos, g.IO.MousePos)
    if window == nil then
        g.WheelingWindowStartFrame = -1
        g.WheelingAxisAvg = ImVec2(0.0, 0.0)
    end
end

--- @param wheel ImVec2
--- @return ImGuiWindow?
local function FindBestWheelingWindow(wheel)
    local g = GImGui
    local windows = {nil, nil}
    for axis = ImGuiAxis.X, ImGuiAxis.Y do
        if wheel[axis] ~= 0.0 then
            windows[axis] = g.HoveredWindow
            local window = g.HoveredWindow
            while bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 do
                local has_scrolling = (window.ScrollMax[axis] ~= 0.0)
                local inputs_disabled = (bit32.band(window.Flags, ImGuiWindowFlags.NoScrollWithMouse) ~= 0) and not (bit32.band(window.Flags, ImGuiWindowFlags.NoMouseInputs) ~= 0)

                if has_scrolling and not inputs_disabled then
                    break -- select this window
                end

                windows[axis] = window.ParentWindow
                window = window.ParentWindow
            end
        end
    end
    if windows[1] == nil and windows[2] == nil then
        return nil
    end

    if (windows[1] == windows[2] or windows[1] == nil or windows[2] == nil) then
        return windows[2] and windows[2] or windows[1]
    end

    if (g.WheelingWindowStartFrame == -1) then
        g.WheelingWindowStartFrame = g.FrameCount
    end
    if ((g.WheelingWindowStartFrame == g.FrameCount and wheel.x ~= 0.0 and wheel.y ~= 0.0) or (g.WheelingAxisAvg.x == g.WheelingAxisAvg.y)) then
        ImVec2_Copy(g.WheelingWindowWheelRemainder, wheel)

        return nil
    end
    return (g.WheelingAxisAvg.x > g.WheelingAxisAvg.y) and windows[1] or windows[2]
end

function ImGui.UpdateMouseWheel()
    local g = GImGui
    if g.WheelingWindow ~= nil then
        g.WheelingWindowReleaseTimer = g.WheelingWindowReleaseTimer - g.IO.DeltaTime
        if ImGui.IsMousePosValid() and ImLengthSqr(g.IO.MousePos - g.WheelingWindowRefMousePos) > g.IO.MouseDragThreshold * g.IO.MouseDragThreshold then
            g.WheelingWindowReleaseTimer = 0.0
        end

        if g.WheelingWindowReleaseTimer <= 0.0 then
            LockWheelingWindow(nil, 0.0)
        end
    end

    local mouse_window = g.WheelingWindow and g.WheelingWindow or g.HoveredWindow
    if not mouse_window or mouse_window.Collapsed then
        return
    end

    local owner_id = mouse_window.ID
    local wheel = ImVec2()
    wheel.x = ImGui.TestKeyOwner(ImGuiKey.MouseWheelX, owner_id) and g.IO.MouseWheelH or 0.0
    wheel.y = ImGui.TestKeyOwner(ImGuiKey.MouseWheelY, owner_id) and g.IO.MouseWheel or 0.0
    if g.WheelingWindow ~= nil then
        ImGui.SetKeyOwner(ImGuiKey.MouseWheelX, owner_id)
        ImGui.SetKeyOwner(ImGuiKey.MouseWheelY, owner_id)
    end

    -- Zoom / Scale window
    -- FIXME-OBSOLETE: This is an old feature, it still works but pretty much nobody is using it and may be best redesigned
    if wheel.y ~= 0.0 and g.IO.KeyCtrl and g.IO.FontAllowUserScaling then
        LockWheelingWindow(mouse_window, wheel.y)
        local window = mouse_window
        local new_font_scale = ImClamp(window.FontWindowScale + g.IO.MouseWheel * 0.10, 0.50, 2.50)
        local scale = new_font_scale / window.FontWindowScale
        window.FontWindowScale = new_font_scale
        if window == window.RootWindow then
            local offset = window.Size * (1.0 - scale) * (g.IO.MousePos - window.Pos) / window.Size
            ImGui.SetWindowPos(window, window.Pos + offset, 0)
            -- MarkIniSettingsDirty(window)
        end
        return
    end
    if g.IO.KeyCtrl then
        return
    end

    -- Mouse wheel scrolling
    if (g.IO.MouseWheelRequestAxisSwap) then
        wheel = ImVec2(wheel.y, 0.0)
    end

    -- Maintain a rough average of moving magnitude on both axes
    -- FIXME: should by based on wall clock time rather than frame-counter
    g.WheelingAxisAvg.x = ImStd.ImExponentialMovingAverage(g.WheelingAxisAvg.x, ImAbs(wheel.x), 30)
    g.WheelingAxisAvg.y = ImStd.ImExponentialMovingAverage(g.WheelingAxisAvg.y, ImAbs(wheel.y), 30)

    -- In the rare situation where FindBestWheelingWindow() had to defer first frame of wheeling due to ambiguous main axis, reinject it now
    wheel = wheel + g.WheelingWindowWheelRemainder
    g.WheelingWindowWheelRemainder = ImVec2(0.0, 0.0)
    if (wheel.x == 0.0 and wheel.y == 0.0) then
        return
    end

    -- Mouse wheel scrolling: find target and apply
    -- - don't renew lock if axis doesn't apply on the window.
    -- - select a main axis when both axes are being moved.
    local window
    if g.WheelingWindow then
        window = g.WheelingWindow
    else
        window = FindBestWheelingWindow(wheel)
    end
    if window then
        if not (bit32.band(window.Flags, ImGuiWindowFlags.NoScrollWithMouse) ~= 0) and not (bit32.band(window.Flags, ImGuiWindowFlags.NoMouseInputs) ~= 0) then
            local do_scroll = { wheel.x ~= 0.0 and window.ScrollMax.x ~= 0.0, wheel.y ~= 0.0 and window.ScrollMax.y ~= 0.0 }

            if do_scroll[ImGuiAxis.X] and do_scroll[ImGuiAxis.Y] then
                do_scroll[(g.WheelingAxisAvg.x > g.WheelingAxisAvg.y) and ImGuiAxis.Y or ImGuiAxis.X] = false
            end

            if do_scroll[ImGuiAxis.X] then
                LockWheelingWindow(window, wheel.x)
                local max_step = window.InnerRect:GetWidth() * 0.67
                local scroll_step = ImTrunc(ImMin(2 * window.FontRefSize, max_step))
                ImGui.SetScrollX(window, window.Scroll.x - wheel.x * scroll_step)
                g.WheelingWindowScrolledFrame = g.FrameCount
            end

            if do_scroll[ImGuiAxis.Y] then
                LockWheelingWindow(window, wheel.y)
                local max_step = window.InnerRect:GetHeight() * 0.67
                local scroll_step = ImTrunc(ImMin(5 * window.FontRefSize, max_step))
                ImGui.SetScrollY(window, window.Scroll.y - wheel.y * scroll_step)
                g.WheelingWindowScrolledFrame = g.FrameCount
            end
        end
    end
end

local function SetupDrawListSharedData()
    local g = GImGui
    local virtual_space = ImRect(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX)
    for _, viewport in g.Viewports:iter() do
        virtual_space:Add(viewport:GetMainRect())
    end
    g.DrawListSharedData.ClipRectFullscreen = virtual_space:ToVec4()
    g.DrawListSharedData.CurveTessellationTol = g.Style.CurveTessellationTol
    g.DrawListSharedData:SetCircleTessellationMaxError(g.Style.CircleTessellationMaxError)
    g.DrawListSharedData.InitialFlags = ImDrawListFlags.None
    if g.Style.AntiAliasedLines then
        g.DrawListSharedData.InitialFlags = bit32.bor(g.DrawListSharedData.InitialFlags, ImDrawListFlags.AntiAliasedLines)
    end
    if g.Style.AntiAliasedLinesUseTex and not bit32.band(g.IO.Fonts.Flags, ImFontAtlasFlags.NoBakedLines) then
        g.DrawListSharedData.InitialFlags = bit32.bor(g.DrawListSharedData.InitialFlags, ImDrawListFlags.AntiAliasedLinesUseTex)
    end
    if g.Style.AntiAliasedFill then
        g.DrawListSharedData.InitialFlags = bit32.bor(g.DrawListSharedData.InitialFlags, ImDrawListFlags.AntiAliasedFill)
    end
    if bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.RendererHasVtxOffset) then
        g.DrawListSharedData.InitialFlags = bit32.bor(g.DrawListSharedData.InitialFlags, ImDrawListFlags.AllowVtxOffset)
    end
    g.DrawListSharedData.InitialFringeScale = 1.0
end

--- @param viewport ImGuiViewportP
local function InitViewportDrawData(viewport)
    local g = GImGui
    local draw_data = viewport.DrawDataP

    viewport.DrawData = draw_data
    viewport.DrawDataBuilder.Layers[1] = draw_data.CmdLists
    viewport.DrawDataBuilder.Layers[2] = viewport.DrawDataBuilder.LayerData1
    viewport.DrawDataBuilder.Layers[1]:resize(0)
    viewport.DrawDataBuilder.Layers[2]:resize(0)

    -- When minimized, we report draw_data->DisplaySize as zero to be consistent with non-viewport mode,
    -- and to allow applications/backends to easily skip rendering.
    -- FIXME: Note that we however do NOT attempt to report "zero drawlist / vertices" into the ImDrawData structure.
    -- This is because the work has been done already, and its wasted! We should fix that and add optimizations for
    -- it earlier in the pipeline, rather than pretend to hide the data at the end of the pipeline.
    local is_minimized = bit32.band(viewport.Flags, ImGuiViewportFlags.IsMinimized) ~= 0

    draw_data.Valid         = true
    draw_data.FrameCount    = g.FrameCount
    draw_data.TotalVtxCount = 0
    draw_data.TotalIdxCount = 0
    draw_data.DisplayPos    = viewport.Pos
    if is_minimized then
        draw_data.DisplaySize = ImVec2(0.0, 0.0)
    else
        ImVec2_Copy(draw_data.DisplaySize, viewport.Size)
    end
    if viewport.FramebufferScale.x ~= 0.0 then
        draw_data.FramebufferScale = viewport.FramebufferScale
    else
        draw_data.FramebufferScale = g.IO.DisplayFramebufferScale
    end

    draw_data.OwnerViewport = viewport
    draw_data.Textures      = g.PlatformIO.Textures
end

-- FIXME-DPI:
function ImGui.GetScale()
    local g = GImGui
    return g.Style._MainScale
end

--- @return ImGuiWindow
function ImGui.GetCurrentWindowRead()
    local g = GImGui
    return g.CurrentWindow
end

--- @return ImGuiWindow
function ImGui.GetCurrentWindow()
    local g = GImGui
    g.CurrentWindow.WriteAccessed = true
    return g.CurrentWindow
end

--- @param clip_rect_min                     ImVec2
--- @param clip_rect_max                     ImVec2
--- @param intersect_with_current_clip_rect? bool
function ImGui.PushClipRect(clip_rect_min, clip_rect_max, intersect_with_current_clip_rect)
    local window = ImGui.GetCurrentWindow()
    window.DrawList:PushClipRect(clip_rect_min, clip_rect_max, intersect_with_current_clip_rect)
    ImRect_CopyFromV4(window.ClipRect, window.DrawList._ClipRectStack:back())
end

function ImGui.PopClipRect()
    local window = ImGui.GetCurrentWindow()
    window.DrawList:PopClipRect()
    ImRect_CopyFromV4(window.ClipRect, window.DrawList._ClipRectStack:back())
end

--- @param viewport      ImGuiViewportP
--- @param drawlist_no   size_t         # background(1), foreground(2)
--- @param drawlist_name string
--- @return ImDrawList
local function GetViewportBgFgDrawList(viewport, drawlist_no, drawlist_name)
    local g = GImGui
    IM_ASSERT(drawlist_no <= 2) -- IM_COUNTOF(viewport->BgFgDrawLists)
    local draw_list = viewport.BgFgDrawLists[drawlist_no]
    if draw_list == nil then
        draw_list = ImDrawList(g.DrawListSharedData)
        draw_list._OwnerName = drawlist_name
        viewport.BgFgDrawLists[drawlist_no] = draw_list
    end

    if viewport.BgFgDrawListsLastTimeActive[drawlist_no] ~= g.Time then
        draw_list:_ResetForNewFrame()
        draw_list:PushTexture(g.IO.Fonts.TexRef)
        draw_list:PushClipRect(viewport.Pos, viewport.Pos + viewport.Size, false)
        viewport.BgFgDrawListsLastTimeActive[drawlist_no] = g.Time
    end

    return draw_list
end

--- @param viewport? ImGuiViewport
function ImGui.GetBackgroundDrawList(viewport)
    local g = GImGui

    if (viewport == nil) then
        viewport = g.CurrentWindow.Viewport
    end

    --- @cast viewport ImGuiViewportP
    return GetViewportBgFgDrawList(viewport, 1, "##Background")
end

--- @param viewport? ImGuiViewport
function ImGui.GetForegroundDrawList(viewport)
    local g = GImGui

    if (viewport == nil) then
        viewport = g.CurrentWindow.Viewport
    end

    --- @cast viewport ImGuiViewportP
    return GetViewportBgFgDrawList(viewport, 2, "##Foreground")
end

-- FIXME: Add a more explicit sort order in the window structure
--- @param lhs ImGuiWindow
--- @param rhs ImGuiWindow
local function ChildWindowComparer(lhs, rhs)
    local a, b = lhs, rhs
    local d = (bit32.band(a.Flags, ImGuiWindowFlags.Popup) ~= 0 and 1 or 0) - (bit32.band(b.Flags, ImGuiWindowFlags.Popup) ~= 0 and 1 or 0)
    if d ~= 0 then
        return (d < 0)
    end
    d = (bit32.band(a.Flags, ImGuiWindowFlags.Tooltip) ~= 0 and 1 or 0) - (bit32.band(b.Flags, ImGuiWindowFlags.Tooltip) ~= 0 and 1 or 0)
    if d ~= 0 then
        return (d < 0)
    end
    return (a.BeginOrderWithinParent - b.BeginOrderWithinParent < 0)
end

--- @param out_sorted_windows ImVector<ImGuiWindow>
--- @param window             ImGuiWindow
local function AddWindowToSortBuffer(out_sorted_windows, window)
    out_sorted_windows:push_back(window)
    if window.Active then
        local count = window.DC.ChildWindows.Size
        ImStd.ImQsort(window.DC.ChildWindows.Data, count, ChildWindowComparer)
        for i = 1, count do
            local child = window.DC.ChildWindows[i]
            if child.Active then
                AddWindowToSortBuffer(out_sorted_windows, child)
            end
        end
    end
end

local function AddWindowToDrawData(window, layer)
    local g = GImGui
    local viewport = window.Viewport
    g.IO.MetricsRenderWindows = g.IO.MetricsRenderWindows + 1
    if window.DrawList._Splitter._Count > 1 then
        window.DrawList:ChannelsMerge() -- Merge if user forgot to merge back. Also required for DockNodeHost windows.
    end
    ImGui.AddDrawListToDrawDataEx(viewport.DrawDataP, viewport.DrawDataBuilder.Layers[layer], window.DrawList)
    for _, child in window.DC.ChildWindows:iter() do
        if (ImGui.IsWindowActiveAndVisible(child)) then -- Clipped children may have been marked not active
            AddWindowToDrawData(child, layer)
        end
    end
end

--- @param window ImGuiWindow
local function GetWindowDisplayLayer(window)
    return (bit32.band(window.Flags, ImGuiWindowFlags.Tooltip) ~= 0) and 2 or 1
end

--- @param window ImGuiWindow
local function AddRootWindowToDrawData(window)
    AddWindowToDrawData(window, GetWindowDisplayLayer(window))
end

--- @param builder ImDrawDataBuilder
local function FlattenDrawDataIntoSingleLayer(builder)
    local n = builder.Layers[1].Size
    local full_size = n

    for i = 2, #builder.Layers do
        full_size = full_size + builder.Layers[i].Size
    end

    builder.Layers[1]:resize(full_size)

    for layer_n = 2, #builder.Layers do
        local layer = builder.Layers[layer_n]
        if not layer:empty() then
            for i = 1, layer.Size do
                builder.Layers[1].Data[n + i] = layer.Data[i]
            end

            n = n + layer.Size

            layer:resize(0)
        end
    end
end

function ImGui.NewFrame()
    IM_ASSERT(GImGui ~= nil, "No current context. Did you call ImGui::CreateContext() and ImGui::SetCurrentContext() ?")
    local g = GImGui

    g.ConfigFlagsLastFrame = g.ConfigFlagsCurrFrame
    g.ConfigFlagsCurrFrame = g.IO.ConfigFlags

    -- Load settings on first frame, save settings when modified (after a delay)
    ImGui.UpdateSettings()

    g.Time = g.Time + g.IO.DeltaTime

    g.FrameCount = g.FrameCount + 1
    g.TooltipOverrideCount = 0
    g.WindowsActiveCount = 0
    g.MenusIdSubmittedThisFrame:resize(0)

    -- FIXME: are lines below correct and necessary
    g.FramerateSecPerFrameAccum = g.FramerateSecPerFrameAccum + (g.IO.DeltaTime - g.FramerateSecPerFrame[g.FramerateSecPerFrameIdx])
    g.FramerateSecPerFrame[g.FramerateSecPerFrameIdx] = g.IO.DeltaTime
    g.FramerateSecPerFrameIdx = (g.FramerateSecPerFrameIdx + 1) % 60
    g.FramerateSecPerFrameCount = ImMin(g.FramerateSecPerFrameCount + 1, 60)
    if g.FramerateSecPerFrameAccum > 0 then
        g.IO.Framerate = (1.0 / (g.FramerateSecPerFrameAccum / g.FramerateSecPerFrameCount))
    else
        g.IO.Framerate = FLT_MAX
    end

    ImGui.UpdateInputEvents(g.IO.ConfigInputTrickleEventQueue)

    ImGui.UpdateViewportsNewFrame()

    ImGui.UpdateTexturesNewFrame()

    SetupDrawListSharedData()
    ImGui.UpdateFontsNewFrame()

    g.WithinFrameScope = true

    -- Mark rendering data as invalid to prevent user who may have a handle on it to use it.
    for _, viewport in g.Viewports:iter() do
        viewport.DrawData = nil
        viewport.DrawDataP.Valid = false
    end

    if g.DragDropActive and g.DragDropPayload.SourceId == g.ActiveId then
        ImGui.KeepAliveID(g.DragDropPayload.SourceId)
    end

    if not g.IO.ConfigDebugHighlightIdConflicts or not g.IO.KeyCtrl then
        g.DebugDrawIdConflictsId = 0
    end
    if g.IO.ConfigDebugHighlightIdConflicts and g.HoveredIdPreviousFrameItemCount > 1 then
        g.DebugDrawIdConflictsId = g.HoveredIdPreviousFrame
    end

    -- Update HoveredId data
    if not g.HoveredIdPreviousFrame then
        g.HoveredIdTimer = 0.0
    end
    if not g.HoveredIdPreviousFrame or (g.HoveredId and g.ActiveId == g.HoveredId) then
        g.HoveredIdNotActiveTimer = 0.0
    end
    if g.HoveredId then
        g.HoveredIdTimer = g.HoveredIdTimer + g.IO.DeltaTime
    end
    if g.HoveredId and g.ActiveId ~= g.HoveredId then
        g.HoveredIdNotActiveTimer = g.HoveredIdNotActiveTimer + g.IO.DeltaTime
    end
    g.HoveredIdPreviousFrame = g.HoveredId
    g.HoveredIdPreviousFrameItemCount = 0
    g.HoveredId = 0
    g.HoveredIdAllowOverlap = false
    g.HoveredIdIsDisabled = false

    if (g.ActiveId ~= 0 and g.ActiveIdIsAlive ~= g.ActiveId and g.ActiveIdPreviousFrame == g.ActiveId) then
        IMGUI_DEBUG_LOG_ACTIVEID("NewFrame(): ClearActiveID() 0x%08X because it isn't marked alive anymore!", g.ActiveId)

        ImGui.ClearActiveID()
    end

    -- Update ActiveId data (clear reference to active widget if the widget isn't alive anymore)
    if g.ActiveId then
        g.ActiveIdTimer = g.ActiveIdTimer + g.IO.DeltaTime
    end
    if g.ActiveId and g.ActiveId == g.LastActiveId then
        g.LastActiveIdWasSelected = g.ActiveIdWasSelected
        g.LastActiveIdWasSoleSelected = g.ActiveIdWasSoleSelected
    end

    g.LastActiveIdTimer = g.LastActiveIdTimer + g.IO.DeltaTime
    g.ActiveIdPreviousFrame = g.ActiveId
    g.ActiveIdIsAlive = 0
    g.AnyIdHasBeenEditedThisFrame = false
    g.ActiveIdHasBeenEditedThisFrame = false
    g.ActiveIdIsJustActivated = false
    if g.TempInputId ~= 0 and g.ActiveId ~= g.TempInputId then
        g.TempInputId = 0
    end
    if g.InputTextReactivateId ~= 0 and g.InputTextReactivateId ~= g.DeactivatedItemData.ID then
        g.InputTextReactivateId = 0
    end
    if g.ActiveId == 0 then
        g.ActiveIdUsingNavDirMask = 0x00
        g.ActiveIdUsingAllKeyboardKeys = false
    end
    if g.DeactivatedItemData.ElapseFrame < g.FrameCount then
        g.DeactivatedItemData.ID = 0
    end
    g.DeactivatedItemData.IsAlive = false
    if g.InputTextDeactivatedState.ElapseFrame < g.FrameCount then
        g.InputTextDeactivatedState.ID = 0
    end

    -- Record when we have been stationary as this state is preserved while over same item.
    -- FIXME: The way this is expressed means user cannot alter HoverStationaryDelay during the frame to use varying values.
    -- To allow this we should store HoverItemMaxStationaryTime+ID and perform the >= check in IsItemHovered() function.
    if g.HoverItemDelayId ~= 0 and g.MouseStationaryTimer >= g.Style.HoverStationaryDelay then
        g.HoverItemUnlockedStationaryId = g.HoverItemDelayId
    elseif g.HoverItemDelayId == 0 then
        g.HoverItemUnlockedStationaryId = 0
    end
    if g.HoveredWindow ~= nil and g.MouseStationaryTimer >= g.Style.HoverStationaryDelay then
        g.HoverWindowUnlockedStationaryId = g.HoveredWindow.ID
    elseif g.HoveredWindow == nil then
        g.HoverWindowUnlockedStationaryId = 0
    end

    -- Update hover delay for IsItemHovered() with delays and tooltips
    g.HoverItemDelayIdPreviousFrame = g.HoverItemDelayId
    if g.HoverItemDelayId ~= 0 then
        g.HoverItemDelayTimer = g.HoverItemDelayTimer + g.IO.DeltaTime
        g.HoverItemDelayClearTimer = 0.0
        g.HoverItemDelayId = 0
    elseif g.HoverItemDelayTimer > 0.0 then
        -- This gives a little bit of leeway before clearing the hover timer, allowing mouse to cross gaps
        -- We could expose 0.25f as style.HoverClearDelay but I am not sure of the logic yet, this is particularly subtle.
        g.HoverItemDelayClearTimer = g.HoverItemDelayClearTimer + g.IO.DeltaTime
        if g.HoverItemDelayClearTimer >= ImMax(0.25, g.IO.DeltaTime * 2.0) then  -- ~7 frames at 30 Hz + allow for low framerate
            g.HoverItemDelayTimer = 0.0
            g.HoverItemDelayClearTimer = 0.0  -- May want a decaying timer, in which case need to clamp at max first, based on max of caller last requested timer.
        end
    end

    ImGui.UpdateKeyboardInputs()

    -- Drag and drop
    g.DragDropAcceptIdPrev = g.DragDropAcceptIdCurr
    g.DragDropAcceptIdCurr = 0
    g.DragDropAcceptFlagsPrev = g.DragDropAcceptFlagsCurr
    g.DragDropAcceptFlagsCurr = ImGuiDragDropFlags.None
    g.DragDropAcceptIdCurrRectSurface = FLT_MAX
    g.DragDropWithinSource = false
    g.DragDropWithinTarget = false
    g.DragDropHoldJustPressedId = 0
    if g.DragDropActive then
        local owner_id = (g.ActiveId ~= 0) and g.ActiveId or ImHashStr("##DragDropCancelHandler")
        if ImGui.Shortcut(ImGuiKey.Escape, ImGuiInputFlags.RouteGlobal, owner_id) then
            ImGui.ClearActiveID()
            ImGui.ClearDragDrop()
        end
    end
    g.TooltipPreviousWindow = nil

    ImGui.NavUpdate()

    ImGui.UpdateMouseInputs()

    -- Undocking
    -- (needs to be before UpdateMouseMovingWindowNewFrame so the window is already offset and following the mouse on the detaching frame)
    ImGui.DockContextNewFrameUpdateUndocking(g)

    IM_ASSERT(g.WindowsFocusOrder.Size <= g.Windows.Size)
    local gc_all = g.GcCompactAll or g.IO.ConfigMemoryCompactTimer < 0.0
    local memory_compact_start_time = gc_all and FLT_MAX or (g.Time - g.IO.ConfigMemoryCompactTimer)

    for _, window in g.Windows:iter() do
        window.WasActive = window.Active
        window.Active = false
        window.WriteAccessed = false
        window.BeginCountPreviousFrame = window.BeginCount
        window.BeginCount = 0

        if (not window.WasActive or gc_all) and not window.MemoryCompacted and window.LastTimeActive < memory_compact_start_time then
            ImGui.GcCompactTransientWindowBuffers(window)
        end
    end

    ImGui.UpdateHoveredWindowAndCaptureFlags(g.IO.MousePos)

    ImGui.UpdateMouseMovingWindowNewFrame()

    -- Background darkening/whitening
    if ImGui.GetTopMostPopupModal() ~= nil or (g.NavWindowingTarget ~= nil and g.NavWindowingHighlightAlpha > 0.0) then
        g.DimBgRatio = ImMin(g.DimBgRatio + g.IO.DeltaTime * 6.0, 1.0)
    else
        g.DimBgRatio = ImMax(g.DimBgRatio - g.IO.DeltaTime * 10.0, 0.0)
    end

    g.MouseCursor = ImGuiMouseCursor.Arrow
    g.WantCaptureMouseNextFrame = -1
    g.WantCaptureKeyboardNextFrame = -1
    g.WantTextInputNextFrame = -1

    -- Platform IME data: reset for the frame
    ImGuiPlatformImeData_Copy(g.PlatformImeDataPrev, g.PlatformImeData)
    g.PlatformImeData.WantVisible = false
    g.PlatformImeData.WantTextInput = false

    ImGui.UpdateMouseWheel()

    -- Garbage collect transient buffers of recently unused tables
    for i = 1, g.TablesLastTimeActive.Size do
        if g.TablesLastTimeActive.Data[i] >= 0.0 and g.TablesLastTimeActive.Data[i] < memory_compact_start_time then
            ImGui.TableGcCompactTransientBuffers(g.Tables:GetByIndex(i - 1))
        end
    end
    for _, table_temp_data in g.TablesTempData:iter() do
        table_temp_data.ReconcileColumnsRequests:clear() -- Unusual: clear every frame because this is rarely used.
        if table_temp_data.LastTimeActive >= 0.0 and table_temp_data.LastTimeActive < memory_compact_start_time then
            ImGui.TableGcCompactTransientBuffers(table_temp_data)
        end
    end
    if g.GcCompactAll then
        ImGui.GcCompactTransientMiscBuffers()
    end
    g.GcCompactAll = false

    if (g.NavWindow and not g.NavWindow.WasActive) then
        ImGui.FocusTopMostWindowUnderOne(nil, nil, nil, ImGuiFocusRequestFlags.RestoreFocusedChild)
    end

    g.CurrentWindowStack:resize(0)
    g.BeginPopupStack:resize(0)
    g.ItemFlagsStack:resize(0)
    g.ItemFlagsStack:push_back(ImGuiItemFlags.Default_)
    g.CurrentItemFlags = g.ItemFlagsStack:back()
    g.GroupStack:resize(0)

    -- Docking
    ImGui.DockContextNewFrameUpdateDocking(g)

    g.WithinFrameScopeWithImplicitWindow = true
    ImGui.SetNextWindowSize(ImVec2(400, 400), ImGuiCond.FirstUseEver)
    ImGui.Begin("Debug##Default")
    IM_ASSERT(g.CurrentWindow.IsFallbackWindow == true)

    -- Store stack sizes
    g.ErrorCountCurrentFrame = 0
    g.StackSizesInNewFrame = g.StackSizesInNewFrame or ImGuiErrorRecoveryState()
    ImGui.ErrorRecoveryStoreState(g.StackSizesInNewFrame)
end

function ImGui.EndFrame()
    local g = GImGui
    IM_ASSERT(g.Initialized)

    if g.FrameCountEnded == g.FrameCount then
        return
    end
    IM_ASSERT_USER_ERROR(g.WithinFrameScope, "Forgot to call ImGui::NewFrame()?")

    -- [EXPERIMENTAL] Recover from errors
    if g.IO.ConfigErrorRecovery and g.StackSizesInNewFrame then
        ImGui.ErrorRecoveryTryToRecoverState(g.StackSizesInNewFrame)
    end
    ImGui.ErrorCheckEndFrameFinalizeErrorTooltip()

    -- Notify Platform when our Input Method Editor cursor has moved
    local ime_data = g.PlatformImeData
    if g.PlatformIO.Platform_SetImeDataFn ~= nil and not ImGuiPlatformImeData_Compare(ime_data, g.PlatformImeDataPrev) then
        local viewport = ImGui.FindViewportByID(ime_data.ViewportId)
        if viewport == nil then
            viewport = ImGui.GetMainViewport()
        end
        -- IMGUI_DEBUG_LOG_IO("[io] Calling Platform_SetImeDataFn(): WantVisible: %d, InputPos (%.2f,%.2f) for Viewport 0x%08X", ime_data.WantVisible, ime_data.InputPos.x, ime_data.InputPos.y, viewport.ID)
        g.PlatformIO.Platform_SetImeDataFn(g, viewport, ime_data)
    end
    g.WantTextInputNextFrame = ime_data.WantTextInput

    g.WithinFrameScopeWithImplicitWindow = false
    if (g.CurrentWindow and g.CurrentWindow.IsFallbackWindow and g.CurrentWindow.WriteAccessed == false) then
        g.CurrentWindow.Active = false
    end
    ImGui.End()

    -- Update navigation: Ctrl+Tab, wrap-around requests
    ImGui.NavEndFrame()

    -- Update docking
    ImGui.DockContextEndFrame(g)

    ImGui.SetCurrentViewport(nil, nil)

    -- Drag and Drop: Elapse payload (if delivered, or if source stops being submitted)
    if g.DragDropActive then
        local is_delivered = g.DragDropPayload.Delivery
        local is_elapsed = (g.DragDropSourceFrameCount + 1 < g.FrameCount) and (bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.PayloadAutoExpire) ~= 0 or g.DragDropMouseButton == -1 or not ImGui.IsMouseDown(g.DragDropMouseButton))
        if is_delivered or is_elapsed then ImGui.ClearDragDrop() end
    end

    -- Drag and Drop: Fallback for missing source tooltip. This is not ideal but better than nothing.
    -- If you want to handle source item disappearing: instead of submitting your description tooltip
    -- in the BeginDragDropSource() block of the dragged item, you can submit them from a safe single spot
    -- (e.g. end of your item loop, or before EndFrame) by reading payload data.
    -- In the typical case, the contents of drag tooltip should be possible to infer solely from payload data.
    if g.DragDropActive and g.DragDropSourceFrameCount + 1 < g.FrameCount and (bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.SourceNoPreviewTooltip) == 0) then
        g.DragDropWithinSource = true
        ImGui.SetTooltip("...")
        g.DragDropWithinSource = false
    end

    g.WithinFrameScope = false
    g.FrameCountEnded = g.FrameCount
    ImGui.UpdateFontsEndFrame()

    ImGui.UpdateMouseMovingWindowEndFrame()

    ImGui.UpdateViewportsEndFrame()

    g.WindowsTempSortBuffer:resize(0)
    g.WindowsTempSortBuffer:reserve(g.Windows.Size)
    for _, window in g.Windows:iter() do
        repeat
        if window.Active and bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 then -- if a child is active its parent will add it
            break
        end

        AddWindowToSortBuffer(g.WindowsTempSortBuffer, window)

        until true
    end

    IM_ASSERT(g.Windows.Size == g.WindowsTempSortBuffer.Size)
    g.Windows:swap(g.WindowsTempSortBuffer)
    g.IO.MetricsActiveWindows = g.WindowsActiveCount

    ImGui.UpdateTexturesEndFrame()

    for _, atlas in g.FontAtlases:iter() do
        atlas.Locked = false
    end

    ImVec2_Copy(g.IO.MousePosPrev, g.IO.MousePos)
    g.IO.AppFocusLost = false
    g.IO.MouseWheel = 0.0
    g.IO.MouseWheelH = 0.0
    g.IO.InputQueueCharacters:resize(0)
end

-- TODO:
function ImGui.Render()
    local g = GImGui
    IM_ASSERT(g.Initialized)

    if g.FrameCountEnded ~= g.FrameCount then
        ImGui.EndFrame()
    end
    if g.FrameCountRendered == g.FrameCount then return end
    g.FrameCountRendered = g.FrameCount

    g.IO.MetricsRenderWindows = 0

    for _, viewport in g.Viewports:iter() do
        InitViewportDrawData(viewport)
        if viewport.BgFgDrawLists[1] ~= nil and viewport.BgFgDrawListsLastTimeActive[1] == g.Time then
            ImGui.AddDrawListToDrawDataEx(viewport.DrawDataP, viewport.DrawDataBuilder.Layers[1], ImGui.GetBackgroundDrawList(viewport))
        end
    end

    ImGui.RenderDimmedBackgrounds()

    local windows_to_render_top_most = {nil, nil}
    windows_to_render_top_most[1] = (g.NavWindowingTarget and (bit32.band(g.NavWindowingTarget.Flags, ImGuiWindowFlags.NoBringToFrontOnFocus) == 0)) and g.NavWindowingTarget.RootWindowDockTree or nil
    windows_to_render_top_most[2] = g.NavWindowingTarget and g.NavWindowingListWindow or nil
    for _, window in g.Windows:iter() do
        if ImGui.IsWindowActiveAndVisible(window) and (bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) == 0) and window ~= windows_to_render_top_most[1] and window ~= windows_to_render_top_most[2] then
            AddRootWindowToDrawData(window)
        end
    end
    for n = 1, 2 do
        if windows_to_render_top_most[n] and ImGui.IsWindowActiveAndVisible(windows_to_render_top_most[n]) then  -- NavWindowingTarget is always temporarily displayed as the top-most window
            AddRootWindowToDrawData(windows_to_render_top_most[n])
        end
    end

    -- Draw software mouse cursor if requested by io.MouseDrawCursor flag
    if g.IO.MouseDrawCursor and g.MouseCursor ~= ImGuiMouseCursor.None then
        ImGui.RenderMouseCursor(g.IO.MousePos, g.Style.MouseCursorScale, g.MouseCursor, IM_COL32_WHITE, IM_COL32_BLACK, IM_COL32(0, 0, 0, 48))
    end

    g.IO.MetricsRenderVertices = 0
    g.IO.MetricsRenderIndices = 0
    for _, viewport in g.Viewports:iter() do
        FlattenDrawDataIntoSingleLayer(viewport.DrawDataBuilder)

        if viewport.BgFgDrawLists[2] ~= nil and viewport.BgFgDrawListsLastTimeActive[2] == g.Time then
            ImGui.AddDrawListToDrawDataEx(viewport.DrawDataP, viewport.DrawDataBuilder.Layers[1], ImGui.GetForegroundDrawList(viewport))
        end

        local draw_data = viewport.DrawDataP
        for _, draw_list in draw_data.CmdLists:iter() do
            draw_list:_PopUnusedDrawCmd()
        end

        g.IO.MetricsRenderVertices = g.IO.MetricsRenderVertices + draw_data.TotalVtxCount
        g.IO.MetricsRenderIndices = g.IO.MetricsRenderIndices + draw_data.TotalIdxCount
    end
end

--- @param text                         ImString
--- @param text_end?                    int    # Exclusive upper bound
--- @param hide_text_after_double_hash? bool
--- @param wrap_width?                  float
--- @return ImVec2
function ImGui.CalcTextSize(text, text_end, hide_text_after_double_hash, wrap_width)
    return ImGui.CalcTextSizeEx(text, 1, text_end, hide_text_after_double_hash, wrap_width)
end

--- @param text                         ImString
--- @param text_begin                   int
--- @param text_end?                    int    # Exclusive upper bound
--- @param hide_text_after_double_hash? bool
--- @param wrap_width?                  float
--- @return ImVec2
function ImGui.CalcTextSizeEx(text, text_begin, text_end, hide_text_after_double_hash, wrap_width)
    if hide_text_after_double_hash == nil then hide_text_after_double_hash = false end
    if wrap_width                  == nil then wrap_width                  = -1.0  end

    local g = GImGui

    local text_display_end
    if hide_text_after_double_hash then
        text_display_end = ImGui.FindRenderedTextEnd(text, text_end)
    else
        text_display_end = text_end
    end

    local font = g.Font
    local font_size = g.FontSize
    if text == "" or (text_end and text_end <= text_begin) then
        return ImVec2(0.0, font_size)
    end
    local text_size = font:CalcTextSizeA(font_size, FLT_MAX, wrap_width, text, text_begin, text_display_end, nil)

    text_size.x = ImCeilFast(text_size.x)

    return text_size
end

function ImGui.GetDrawData()
    local g = GImGui
    local viewport = g.Viewports[1]
    return viewport.DrawDataP.Valid and viewport.DrawDataP or nil
end

function ImGui.GetTime()
    return GImGui.Time
end

function ImGui.Shutdown()
    local g = GImGui
    IM_ASSERT_USER_ERROR(g.IO.BackendPlatformUserData == nil, "Forgot to shutdown Platform backend?")
    IM_ASSERT_USER_ERROR(g.IO.BackendRendererUserData == nil, "Forgot to shutdown Renderer backend?")
    for _, viewport in g.Viewports:iter() do
        -- IM_UNUSED(viewport)
        IM_ASSERT_USER_ERROR(viewport.RendererUserData == nil and viewport.PlatformUserData == nil and viewport.PlatformHandle == nil, "Backend or app forgot to call DestroyPlatformWindows()?")
    end

    for _, atlas in g.FontAtlases:iter() do
        ImGui.UnregisterFontAtlas(atlas)
        if atlas.OwnerContext == g then
            IM_ASSERT(atlas.RefCount == 0, "Destroying context owning a ImFontAtlas which is still used elsewhere!")
            if atlas.RefCount == 0 then
                atlas.Locked = false
            end
        end
    end
    g.DrawListSharedData.TempBuffer:clear()

    ImGui.DockContextShutdown(g)

    if not g.Initialized then
        return
    end
    -- TODO:

    g.MenusIdSubmittedThisFrame:clear()
end

--- @return string?
function ImGui.GetClipboardText()
    local g = GImGui
    return g.PlatformIO.Platform_GetClipboardTextFn and g.PlatformIO.Platform_GetClipboardTextFn(g) or nil
end

--- @param text string
function ImGui.SetClipboardText(text)
    local g = GImGui
    if g.PlatformIO.Platform_SetClipboardTextFn ~= nil then
        g.PlatformIO.Platform_SetClipboardTextFn(g, text)
    end
end

function ImGui.GetIO() return GImGui.IO end

--- @return ImGuiPlatformIO
function ImGui.GetPlatformIO()
    IM_ASSERT(GImGui ~= nil, "No current context. Did you call ImGui.CreateContext() and ImGui.SetCurrentContext()?")
    return GImGui.PlatformIO
end

function ImGui.GetMouseCursor()
    local g = GImGui
    return g.MouseCursor
end

--- @param cursor_type ImGuiMouseCursor
function ImGui.SetMouseCursor(cursor_type)
    local g = GImGui
    g.MouseCursor = cursor_type
end

--- @param col_a ImU32
--- @param col_b ImU32
--- @return ImU32
function ImStd.ImAlphaBlendColors(col_a, col_b)
    local t = bit32.band(bit32.rshift(col_b, IM_COL32_A_SHIFT), 0xFF) / 255.0
    local r = ImLerp(bit32.band(bit32.rshift(col_a, IM_COL32_R_SHIFT), 0xFF), bit32.band(bit32.rshift(col_b, IM_COL32_R_SHIFT), 0xFF), t)
    local g = ImLerp(bit32.band(bit32.rshift(col_a, IM_COL32_G_SHIFT), 0xFF), bit32.band(bit32.rshift(col_b, IM_COL32_G_SHIFT), 0xFF), t)
    local b = ImLerp(bit32.band(bit32.rshift(col_a, IM_COL32_B_SHIFT), 0xFF), bit32.band(bit32.rshift(col_b, IM_COL32_B_SHIFT), 0xFF), t)
    return IM_COL32(r, g, b, 0xFF)
end

--- @param in_col  ImU32
--- @param out_col ImVec4?
--- @return ImVec4?
function ImGui.ColorConvertU32ToFloat4(in_col, out_col)
    local s = 1.0 / 255.0
    local r = bit32.band(bit32.rshift(in_col, IM_COL32_R_SHIFT), 0xFF) * s
    local g = bit32.band(bit32.rshift(in_col, IM_COL32_G_SHIFT), 0xFF) * s
    local b = bit32.band(bit32.rshift(in_col, IM_COL32_B_SHIFT), 0xFF) * s
    local a = bit32.band(bit32.rshift(in_col, IM_COL32_A_SHIFT), 0xFF) * s

    if out_col then
        out_col[1] = r; out_col[2] = g; out_col[3] = b; out_col[4] = a
    else
        return ImVec4(r, g, b, a)
    end
end

--- @param in_col ImVec4
--- @return ImU32
function ImGui.ColorConvertFloat4ToU32(in_col)
    local out_col = 0
    out_col = bit32.bor(out_col, bit32.lshift(IM_F32_TO_INT8_SAT(in_col.x), IM_COL32_R_SHIFT))
    out_col = bit32.bor(out_col, bit32.lshift(IM_F32_TO_INT8_SAT(in_col.y), IM_COL32_G_SHIFT))
    out_col = bit32.bor(out_col, bit32.lshift(IM_F32_TO_INT8_SAT(in_col.z), IM_COL32_B_SHIFT))
    out_col = bit32.bor(out_col, bit32.lshift(IM_F32_TO_INT8_SAT(in_col.w), IM_COL32_A_SHIFT))
    return out_col
end

--- @param r float
--- @param g float
--- @param b float
--- @return float, float, float
function ImGui.ColorConvertRGBtoHSV(r, g, b)
    local K = 0.0
    if g < b then
        g, b = b, g
        K = -1.0
    end
    if r < g then
        r, g = g, r
        K = -2.0 / 6.0 - K
    end

    local chroma = r - (g < b and g or b)
    local out_h = ImFabs(K + (g - b) / (6.0 * chroma + 1e-20))
    local out_s = chroma / (r + 1e-20)
    local out_v = r
    return out_h, out_s, out_v
end

--- @param h float
--- @param s float
--- @param v float
--- @return float, float, float
function ImGui.ColorConvertHSVtoRGB(h, s, v)
    if s == 0.0 then
        -- gray
        return v, v, v
    end

    h = ImFmod(h, 1.0) / (60.0 / 360.0)
    local i = math.floor(h)
    local f = h - i
    local p = v * (1.0 - s)
    local q = v * (1.0 - s * f)
    local t = v * (1.0 - s * (1.0 - f))

    if i == 0 then
        return v, t, p
    elseif i == 1 then
        return q, v, p
    elseif i == 2 then
        return p, v, t
    elseif i == 3 then
        return p, q, v
    elseif i == 4 then
        return t, p, v
    else -- i == 5 or default
        return v, p, q
    end
end

--- @param clip_rect    ImRect
--- @param pos          ImVec2
--- @param items_height float
function ImGui.CalcClipRectVisibleItemsY(clip_rect, pos, items_height)
    local visible_start = ImMax(ImTrunc((clip_rect.Min.y - pos.y) / items_height), 0)
    local visible_end = ImMax(ImTrunc(ImCeil((clip_rect.Max.y - pos.y) / items_height)), visible_start)
    return visible_start + 1, visible_end + 1
end

---------------------------------------------------------------------------------------
-- [SECTION] STYLING
---------------------------------------------------------------------------------------

function ImGui.GetStyle()
    IM_ASSERT(GImGui ~= nil, "No current context. Did you call ImGui::CreateContext() and ImGui::SetCurrentContext() ?")
    return GImGui.Style
end

do

local c = ImVec4()

--- @param col         ImGuiCol|ImVec4|ImU32
--- @param alpha_mul?  float
--- @param col_is_u32? bool                  # must be truthy if `col` is `ImU32`
--- @return ImU32
function ImGui.GetColorU32(col, alpha_mul, col_is_u32)
    if alpha_mul == nil then alpha_mul = 1.0 end

    local style = GImGui.Style

    if not col_is_u32 then
        --- @cast col ImVec4|ImGuiCol
        if type(col) == "number" then
            ImVec4_Copy(c, style.Colors[col])
            c.w = c.w * style.Alpha * alpha_mul
        else --- @cast col ImVec4
            ImVec4_Copy(c, col)
            c.w = c.w * style.Alpha
        end
        return ImGui.ColorConvertFloat4ToU32(c)
    else
        --- @cast col ImU32
        alpha_mul = alpha_mul * style.Alpha
        if alpha_mul >= 1.0 then
            return col
        end
        local a = bit32.rshift(bit32.band(col, IM_COL32_A_MASK), IM_COL32_A_SHIFT)
        a = math.floor(a * alpha_mul) -- We don't need to clamp 0..255 because alpha is in 0..1 range.
        return bit32.bor(bit32.band(col, bit32.bnot(IM_COL32_A_MASK)), bit32.lshift(a, IM_COL32_A_SHIFT))
    end
end

end

--- @param idx ImGuiCol
--- @param col ImU32|ImVec4
function ImGui.PushStyleColor(idx, col)
    local g = GImGui
    local backup = ImGuiColorMod(idx, g.Style.Colors[idx])
    g.ColorStack:push_back(backup)
    if g.DebugFlashStyleColorIdx ~= idx then
        if type(col) == "number" then
            ImGui.ColorConvertU32ToFloat4(col, g.Style.Colors[idx])
        else --- @cast col ImVec4
            ImVec4_Copy(g.Style.Colors[idx], col)
        end
    end
end

--- @param count? int
function ImGui.PopStyleColor(count)
    if count == nil then count = 1 end

    local g = GImGui
    if g.ColorStack.Size < count then
        IM_ASSERT_USER_ERROR(false, "Calling PopStyleColor() too many times!")
        count = g.ColorStack.Size
    end

    while count > 0 do
        local backup = g.ColorStack:back()
        ImVec4_Copy(g.Style.Colors[backup.Col], backup.BackupValue)
        g.ColorStack:pop_back()
        count = count - 1
    end
end

local GStyleVarsInfo = {
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "Alpha"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "DisabledAlpha"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "WindowPadding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "WindowRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "WindowBorderSize"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "WindowMinSize"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "WindowTitleAlign"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "ChildRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "ChildBorderSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "PopupRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "PopupBorderSize"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "FramePadding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "FrameRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "FrameBorderSize"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "ItemSpacing"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "ItemInnerSpacing"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "IndentSpacing"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "CellPadding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "ScrollbarSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "ScrollbarRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "ScrollbarPadding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "GrabMinSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "GrabRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "ImageRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "ImageBorderSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TabRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TabBorderSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TabMinWidthBase"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TabMinWidthShrink"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TabBarBorderSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TabBarOverlineSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TableAngledHeadersAngle"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "TableAngledHeadersTextAlign"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TreeLinesSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "TreeLinesRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "MenuItemRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "SelectableRounding"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "DragDropTargetRounding"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "ButtonTextAlign"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "SelectableTextAlign"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "SeparatorSize"),
    ImGuiStyleVarInfo(1, ImGuiDataType.Float, "SeparatorTextBorderSize"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "SeparatorTextAlign"),
    ImGuiStyleVarInfo(2, ImGuiDataType.Float, "SeparatorTextPadding")
}

--- @param idx ImGuiStyleVar
--- @return ImGuiStyleVarInfo
function ImGui.GetStyleVarInfo(idx)
    IM_ASSERT(idx >= 0 and idx < ImGuiStyleVar.COUNT)
    -- IM_STATIC_ASSERT(IM_COUNTOF(GStyleVarsInfo) == ImGuiStyleVar_COUNT)
    return GStyleVarsInfo[idx + 1]
end

--- @param idx ImGuiStyleVar
--- @param val float|ImVec2
function ImGui.PushStyleVar(idx, val)
    local g = GImGui
    local var_info = ImGui.GetStyleVarInfo(idx)
    if type(val) == "number" then
        IM_ASSERT_USER_ERROR_RET(var_info.DataType == ImGuiDataType.Float and var_info.Count == 1, "Calling PushStyleVar() with wrong type!")
    else -- ImVec2
        IM_ASSERT_USER_ERROR_RET(var_info.DataType == ImGuiDataType.Float and var_info.Count == 2, "Calling PushStyleVar() with wrong type!")
    end
    local var = g.Style[var_info.Key]
    g.StyleVarStack:push_back(ImGuiStyleMod(idx, var))
    g.Style[var_info.Key] = val
end

--- @param idx   ImGuiStyleVar
--- @param val_x float
function ImGui.PushStyleVarX(idx, val_x)
    local g = GImGui
    local var_info = ImGui.GetStyleVarInfo(idx)
    IM_ASSERT_USER_ERROR_RET(var_info.DataType == ImGuiDataType.Float and var_info.Count == 2, "Calling PushStyleVarX() with wrong type!")
    local pvar = g.Style[var_info.Key]
    g.StyleVarStack:push_back(ImGuiStyleMod(idx, pvar))
    pvar.x = val_x
end

--- @param idx   ImGuiStyleVar
--- @param val_y float
function ImGui.PushStyleVarY(idx, val_y)
    local g = GImGui
    local var_info = ImGui.GetStyleVarInfo(idx)
    IM_ASSERT_USER_ERROR_RET(var_info.DataType == ImGuiDataType.Float and var_info.Count == 2, "Calling PushStyleVarY() with wrong type!")
    local pvar = g.Style[var_info.Key]
    g.StyleVarStack:push_back(ImGuiStyleMod(idx, pvar))
    pvar.y = val_y
end

--- @param count? int
function ImGui.PopStyleVar(count)
    if count == nil then count = 1 end

    local g = GImGui
    if g.StyleVarStack.Size < count then
        IM_ASSERT_USER_ERROR(0, "Calling PopStyleVar() too many times!")
        count = g.StyleVarStack.Size
    end
    while count > 0 do
        local backup = g.StyleVarStack:back()
        local var_info = ImGui.GetStyleVarInfo(backup.VarIdx)
        local data = g.Style[var_info.Key]
        if (var_info.DataType == ImGuiDataType.Float and var_info.Count == 1) then
            g.Style[var_info.Key] = backup.BackupVal[1]
        elseif (var_info.DataType == ImGuiDataType.Float and var_info.Count == 2) then
            data.x = backup.BackupVal[1]; data.y = backup.BackupVal[2]
        end
        g.StyleVarStack:pop_back()
        count = count - 1
    end
end

--- @param wrap_local_pos_x float
function ImGui.PushTextWrapPos(wrap_local_pos_x) -- ATTENTION: THIS IS IN LEGACY LOCAL SPACE.
    local g = GImGui
    local window = g.CurrentWindow
    window.DC.TextWrapPosStack:push_back(window.DC.TextWrapPos)
    window.DC.TextWrapPos = wrap_local_pos_x
end

function ImGui.PopTextWrapPos()
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT_USER_ERROR_RET(window.DC.TextWrapPosStack.Size > 0, "Calling PopTextWrapPos() too many times!")
    window.DC.TextWrapPos = window.DC.TextWrapPosStack:back()
    window.DC.TextWrapPosStack:pop_back()
end

--- @param window          ImGuiWindow
--- @param popup_hierarchy bool
--- @param dock_hierarchy  bool
local function GetCombinedRootWindow(window, popup_hierarchy, dock_hierarchy)
    local last_window = nil
    while last_window ~= window do
        last_window = window
        window = window.RootWindow
        if popup_hierarchy then
            window = window.RootWindowPopupTree
        end
        if dock_hierarchy then
            window = window.RootWindowDockTree
        end
    end
    return window
end

--- @param window           ImGuiWindow
--- @param potential_parent ImGuiWindow
--- @param popup_hierarchy  bool
--- @param dock_hierarchy   bool
function ImGui.IsWindowChildOf(window, potential_parent, popup_hierarchy, dock_hierarchy)
    local window_root = GetCombinedRootWindow(window, popup_hierarchy, dock_hierarchy)
    if window_root == potential_parent then
        return true
    end

    while window ~= nil do
        if window == potential_parent then
            return true
        end
        if window == window_root then -- end of chain
            return false
        end
        window = window.ParentWindow
    end

    return false
end

--- @param window ImGuiWindow
function ImGui.IsWindowInBeginStack(window)
    local g = GImGui
    for n = g.CurrentWindowStack.Size, 1, -1 do
        if g.CurrentWindowStack.Data[n].Window == window then
            return true
        end
    end
    return false
end

--- @param window           ImGuiWindow
--- @param potential_parent ImGuiWindow
function ImGui.IsWindowWithinBeginStackOf(window, potential_parent)
    if window.RootWindow == potential_parent then
        return true
    end

    while window ~= nil do
        if window == potential_parent then
            return true
        end
        window = window.ParentWindowInBeginStack
    end

    return false
end

--- @param potential_above ImGuiWindow
--- @param potential_below ImGuiWindow
--- @return bool
function ImGui.IsWindowAbove(potential_above, potential_below)
    local g = GImGui

    -- It would be saner to ensure that display layer is always reflected in the g.Windows order, which would likely requires altering all manipulations of that array
    local display_layer_delta = GetWindowDisplayLayer(potential_above) - GetWindowDisplayLayer(potential_below)
    if display_layer_delta ~= 0 then
        return display_layer_delta > 0
    end

    for i = g.Windows.Size, 1, -1 do
        local candidate_window = g.Windows.Data[i]
        if candidate_window == potential_above then
            return true
        end
        if candidate_window == potential_below then
            return false
        end
    end
    return false
end

-- Is current window hovered and hoverable (e.g. not blocked by a popup/modal)? See ImGuiHoveredFlags for options.
--- @param flags? ImGuiHoveredFlags
function ImGui.IsWindowHovered(flags)
    if flags == nil then flags = 0 end
    local g = GImGui
    IM_ASSERT_USER_ERROR(bit32.band(flags, bit32.bnot(ImGuiHoveredFlags.AllowedMaskForIsWindowHovered)) == 0, "Invalid flags for IsWindowHovered()!")

    local ref_window = g.HoveredWindow
    local cur_window = g.CurrentWindow
    if ref_window == nil then
        return false
    end

    if bit32.band(flags, ImGuiHoveredFlags.AnyWindow) == 0 then
        IM_ASSERT(cur_window) -- Not inside a Begin()/End()
        local popup_hierarchy = bit32.band(flags, ImGuiHoveredFlags.NoPopupHierarchy) == 0
        local dock_hierarchy = bit32.band(flags, ImGuiHoveredFlags.DockHierarchy) ~= 0
        if bit32.band(flags, ImGuiHoveredFlags.RootWindow) ~= 0 then
            cur_window = GetCombinedRootWindow(cur_window, popup_hierarchy, dock_hierarchy)
        end

        local result
        if bit32.band(flags, ImGuiHoveredFlags.ChildWindows) ~= 0 then
            result = ImGui.IsWindowChildOf(ref_window, cur_window, popup_hierarchy, dock_hierarchy)
        else
            result = (ref_window == cur_window)
        end
        if not result then
            return false
        end
    end

    if not ImGui.IsWindowContentHoverable(ref_window, flags) then
        return false
    end
    if bit32.band(flags, ImGuiHoveredFlags.AllowWhenBlockedByActiveItem) == 0 then
        if g.ActiveId ~= 0 and not g.ActiveIdAllowOverlap and g.ActiveId ~= ref_window.MoveId then
            return false
        end
    end

    if bit32.band(flags, ImGuiHoveredFlags.ForTooltip) ~= 0 then
        flags = ApplyHoverFlagsForTooltip(flags, g.Style.HoverFlagsForTooltipMouse)
    end
    if bit32.band(flags, ImGuiHoveredFlags.Stationary) ~= 0 and g.HoverWindowUnlockedStationaryId ~= ref_window.ID then
        return false
    end

    return true
end

-- Similar to IsWindowHovered()
--- @param flags? ImGuiFocusedFlags
function ImGui.IsWindowFocused(flags)
    if flags == nil then flags = 0 end
    local g = GImGui
    local ref_window = g.NavWindow
    local cur_window = g.CurrentWindow

    if ref_window == nil then
        return false
    end
    if bit32.band(flags, ImGuiFocusedFlags.AnyWindow) ~= 0 then
        return true
    end

    IM_ASSERT(cur_window) -- Not inside a Begin()/End()
    local popup_hierarchy = bit32.band(flags, ImGuiFocusedFlags.NoPopupHierarchy) == 0
    local dock_hierarchy = bit32.band(flags, ImGuiFocusedFlags.DockHierarchy) ~= 0
    if bit32.band(flags, ImGuiFocusedFlags.RootWindow) ~= 0 then
        cur_window = GetCombinedRootWindow(cur_window, popup_hierarchy, dock_hierarchy)
    end

    if bit32.band(flags, ImGuiFocusedFlags.ChildWindows) ~= 0 then
        return ImGui.IsWindowChildOf(ref_window, cur_window, popup_hierarchy, dock_hierarchy)
    else
        return ref_window == cur_window
    end
end

--- @param window ImGuiWindow
--- @param scale  float
local function ScaleWindow(window, scale)
    local origin = window.Viewport.Pos
    ImVec2_Copy(window.Pos, ImFloor((window.Pos - origin) * scale + origin))
    ImVec2_Copy(window.Size, ImTrunc(window.Size * scale))
    ImVec2_Copy(window.SizeFull, ImTrunc(window.SizeFull * scale))
    ImVec2_Copy(window.ContentSize, ImTrunc(window.ContentSize * scale))
end

--- @param viewport ImGuiViewportP
--- @param scale    float
function ImGui.ScaleWindowsInViewport(viewport, scale)
    local g = GImGui
    -- IMGUI_DEBUG_LOG_VIEWPORT("[viewport] ScaleWindowsInViewport 0x%08X", viewport.ID)

    if viewport.Window then
        ScaleWindow(viewport.Window, scale)
    else
        for _, window in g.Windows:iter() do
            if window.Viewport == viewport then
                ScaleWindow(window, scale)
            end
        end
    end
end

---------------------------------------------------------------------------------------
-- [SECTION] SCROLLING
---------------------------------------------------------------------------------------

--- @param target         float
--- @param snap_min       float
--- @param snap_max       float
--- @param snap_threshold float
--- @param center_ratio   float
local function CalcScrollEdgeSnap(target, snap_min, snap_max, snap_threshold, center_ratio)
    if target <= snap_min + snap_threshold then
        return ImLerp(snap_min, target, center_ratio)
    end
    if target >= snap_max - snap_threshold then
        return ImLerp(target, snap_max, center_ratio)
    end
    return target
end

--- @param window ImGuiWindow
function CalcNextScrollFromScrollTargetAndClamp(window)
    local scroll = ImVec2()
    ImVec2_Copy(scroll, window.Scroll)
    local decoration_size = ImVec2(window.DecoOuterSizeX1 + window.DecoInnerSizeX1 + window.DecoOuterSizeX2, window.DecoOuterSizeY1 + window.DecoInnerSizeY1 + window.DecoOuterSizeY2)

    for axis = ImGuiAxis.X, ImGuiAxis.Y do
        if window.ScrollTarget[axis] < FLT_MAX then
            local center_ratio = window.ScrollTargetCenterRatio[axis]
            local scroll_target = window.ScrollTarget[axis]

            if window.ScrollTargetEdgeSnapDist[axis] > 0.0 then
                local snap_min = 0.0
                local snap_max = window.ScrollMax[axis] + window.SizeFull[axis] - decoration_size[axis]
                scroll_target = CalcScrollEdgeSnap(scroll_target, snap_min, snap_max, window.ScrollTargetEdgeSnapDist[axis], center_ratio)
            end

            scroll[axis] = scroll_target - center_ratio * (window.SizeFull[axis] - decoration_size[axis])
        end
        scroll[axis] = ImRound64(ImMax(scroll[axis], 0.0))
        if not window.Collapsed and not window.SkipItems then
            scroll[axis] = ImMin(scroll[axis], window.ScrollMax[axis])
        end
    end

    return scroll
end

--- @param window    ImGuiWindow
--- @param item_rect ImRect
--- @param flags?    ImGuiScrollFlags
function ImGui.ScrollToRectEx(window, item_rect, flags)
    if flags == nil then flags = 0 end

    local g = GImGui
    local scroll_rect = ImRect(window.InnerRect.Min - ImVec2(1, 1), window.InnerRect.Max + ImVec2(1, 1))
    scroll_rect.Min.x = ImMin(scroll_rect.Min.x + window.DecoInnerSizeX1, scroll_rect.Max.x)
    scroll_rect.Min.y = ImMin(scroll_rect.Min.y + window.DecoInnerSizeY1, scroll_rect.Max.y)

    IM_ASSERT(bit32.band(flags, ImGuiScrollFlags.MaskX_) == 0 or ImIsPowerOfTwo(bit32.band(flags, ImGuiScrollFlags.MaskX_)))
    IM_ASSERT(bit32.band(flags, ImGuiScrollFlags.MaskY_) == 0 or ImIsPowerOfTwo(bit32.band(flags, ImGuiScrollFlags.MaskY_)))

    local in_flags = flags
    if bit32.band(flags, ImGuiScrollFlags.MaskX_) == 0 and window.ScrollbarX then
        flags = bit32.bor(flags, ImGuiScrollFlags.KeepVisibleEdgeX)
    end
    if bit32.band(flags, ImGuiScrollFlags.MaskY_) == 0 then
        flags = bit32.bor(flags, window.Appearing and ImGuiScrollFlags.AlwaysCenterY or ImGuiScrollFlags.KeepVisibleEdgeY)
    end

    local fully_visible_x = item_rect.Min.x >= scroll_rect.Min.x and item_rect.Max.x <= scroll_rect.Max.x
    local fully_visible_y = item_rect.Min.y >= scroll_rect.Min.y and item_rect.Max.y <= scroll_rect.Max.y
    local can_be_fully_visible_x = (item_rect:GetWidth() + g.Style.ItemSpacing.x * 2.0) <= scroll_rect:GetWidth() or (window.AutoFitFramesX > 0) or bit32.band(window.Flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0
    local can_be_fully_visible_y = (item_rect:GetHeight() + g.Style.ItemSpacing.y * 2.0) <= scroll_rect:GetHeight() or (window.AutoFitFramesY > 0) or bit32.band(window.Flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0

    if bit32.band(flags, ImGuiScrollFlags.KeepVisibleEdgeX) ~= 0 and not fully_visible_x then
        if item_rect.Min.x < scroll_rect.Min.x or not can_be_fully_visible_x then
            ImGui.SetScrollFromPosX(window, item_rect.Min.x - g.Style.ItemSpacing.x - window.Pos.x, 0.0)
        elseif item_rect.Max.x >= scroll_rect.Max.x then
            ImGui.SetScrollFromPosX(window, item_rect.Max.x + g.Style.ItemSpacing.x - window.Pos.x, 1.0)
        end
    elseif (bit32.band(flags, ImGuiScrollFlags.KeepVisibleCenterX) ~= 0 and not fully_visible_x) or bit32.band(flags, ImGuiScrollFlags.AlwaysCenterX) ~= 0 then
        if can_be_fully_visible_x then
            ImGui.SetScrollFromPosX(window, ImTrunc((item_rect.Min.x + item_rect.Max.x) * 0.5) - window.Pos.x, 0.5)
        else
            ImGui.SetScrollFromPosX(window, item_rect.Min.x - window.Pos.x, 0.0)
        end
    end

    if bit32.band(flags, ImGuiScrollFlags.KeepVisibleEdgeY) ~= 0 and not fully_visible_y then
        if item_rect.Min.y < scroll_rect.Min.y or not can_be_fully_visible_y then
            ImGui.SetScrollFromPosY(window, item_rect.Min.y - g.Style.ItemSpacing.y - window.Pos.y, 0.0)
        elseif item_rect.Max.y >= scroll_rect.Max.y then
            ImGui.SetScrollFromPosY(window, item_rect.Max.y + g.Style.ItemSpacing.y - window.Pos.y, 1.0)
        end
    elseif (bit32.band(flags, ImGuiScrollFlags.KeepVisibleCenterY) ~= 0 and not fully_visible_y) or bit32.band(flags, ImGuiScrollFlags.AlwaysCenterY) ~= 0 then
        if can_be_fully_visible_y then
            ImGui.SetScrollFromPosY(window, ImTrunc((item_rect.Min.y + item_rect.Max.y) * 0.5) - window.Pos.y, 0.5)
        else
            ImGui.SetScrollFromPosY(window, item_rect.Min.y - window.Pos.y, 0.0)
        end
    end

    local next_scroll = CalcNextScrollFromScrollTargetAndClamp(window)
    local delta_scroll = next_scroll - window.Scroll

    if bit32.band(flags, ImGuiScrollFlags.NoScrollParent) == 0 and bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
        if bit32.band(in_flags, bit32.bor(ImGuiScrollFlags.AlwaysCenterX, ImGuiScrollFlags.KeepVisibleCenterX)) ~= 0 then
            in_flags = bit32.bor(bit32.band(in_flags, bit32.bnot(ImGuiScrollFlags.MaskX_)), ImGuiScrollFlags.KeepVisibleEdgeX)
        end
        if bit32.band(in_flags, bit32.bor(ImGuiScrollFlags.AlwaysCenterY, ImGuiScrollFlags.KeepVisibleCenterY)) ~= 0 then
            in_flags = bit32.bor(bit32.band(in_flags, bit32.bnot(ImGuiScrollFlags.MaskY_)), ImGuiScrollFlags.KeepVisibleEdgeY)
        end
        local parent_delta = ImGui.ScrollToRectEx(window.ParentWindow, ImRect(item_rect.Min - delta_scroll, item_rect.Max - delta_scroll), in_flags)
        delta_scroll = delta_scroll + parent_delta
    end

    return delta_scroll
end

--- @return float
function ImGui.GetScrollMaxY()
    local window = GImGui.CurrentWindow
    return window.ScrollMax.y
end

function ImGui.GetScrollMaxX()
    return GImGui.CurrentWindow.ScrollMax.x
end

function ImGui.GetScrollX()
    return GImGui.CurrentWindow.Scroll.x
end

function ImGui.GetScrollY()
    return GImGui.CurrentWindow.Scroll.y
end

--- @param flags? ImGuiScrollFlags
function ImGui.ScrollToItem(flags)
    local g = GImGui
    ImGui.ScrollToRectEx(g.CurrentWindow, g.LastItemData.NavRect, flags or 0)
end

--- @param window    ImGuiWindow
--- @param item_rect ImRect
--- @param flags?    ImGuiScrollFlags
function ImGui.ScrollToRect(window, item_rect, flags)
    ImGui.ScrollToRectEx(window, item_rect, flags or 0)
end

--- @param center_x_ratio? float
function ImGui.SetScrollHereX(center_x_ratio)
    if center_x_ratio == nil then center_x_ratio = 0.5 end
    local g = GImGui
    local window = g.CurrentWindow
    local spacing_x = ImMax(window.WindowPadding.x, g.Style.ItemSpacing.x)
    local target_pos_x = ImLerp(g.LastItemData.Rect.Min.x - spacing_x, g.LastItemData.Rect.Max.x + spacing_x, center_x_ratio)
    ImGui.SetScrollFromPosX(window, target_pos_x - window.Pos.x, center_x_ratio)
    window.ScrollTargetEdgeSnapDist.x = ImMax(0.0, window.WindowPadding.x - spacing_x)
end

--- @param center_y_ratio? float
function ImGui.SetScrollHereY(center_y_ratio)
    if center_y_ratio == nil then center_y_ratio = 0.5 end
    local g = GImGui
    local window = g.CurrentWindow
    local spacing_y = ImMax(window.WindowPadding.y, g.Style.ItemSpacing.y)
    local target_pos_y = ImLerp(window.DC.CursorPosPrevLine.y - spacing_y, window.DC.CursorPosPrevLine.y + window.DC.PrevLineSize.y + spacing_y, center_y_ratio)
    ImGui.SetScrollFromPosY(window, target_pos_y - window.Pos.y, center_y_ratio)
    window.ScrollTargetEdgeSnapDist.y = ImMax(0.0, window.WindowPadding.y - spacing_y)
end

-- Overloads: SetScrollX(scroll_x) / SetScrollX(window, scroll_x)
--- @param window   ImGuiWindow|float
--- @param scroll_x float?
function ImGui.SetScrollX(window, scroll_x)
    if type(window) == "number" then window, scroll_x = GImGui.CurrentWindow, window end
    window.ScrollTarget.x = scroll_x
    window.ScrollTargetCenterRatio.x = 0.0
    window.ScrollTargetEdgeSnapDist.x = 0.0
end

--- @param window   ImGuiWindow
--- @param scroll_y float
function ImGui.SetScrollY(window, scroll_y)
    if type(window) == "number" then window, scroll_y = GImGui.CurrentWindow, window end
    window.ScrollTarget.y = scroll_y
    window.ScrollTargetCenterRatio.y = 0.0
    window.ScrollTargetEdgeSnapDist.y = 0.0
end

--- @param window         ImGuiWindow
--- @param local_x        float
--- @param center_x_ratio float
function ImGui.SetScrollFromPosX(window, local_x, center_x_ratio)
    if type(window) == "number" then window, local_x, center_x_ratio = GImGui.CurrentWindow, window, local_x end
    if center_x_ratio == nil then center_x_ratio = 0.5 end
    IM_ASSERT(center_x_ratio >= 0.0 and center_x_ratio <= 1.0)
    window.ScrollTarget.x = IM_TRUNC(local_x - window.DecoOuterSizeX1 - window.DecoInnerSizeX1 + window.Scroll.x)
    window.ScrollTargetCenterRatio.x = center_x_ratio
    window.ScrollTargetEdgeSnapDist.x = 0.0
end

--- @param window         ImGuiWindow
--- @param local_y        float
--- @param center_y_ratio float
function ImGui.SetScrollFromPosY(window, local_y, center_y_ratio)
    if type(window) == "number" then window, local_y, center_y_ratio = GImGui.CurrentWindow, window, local_y end
    if center_y_ratio == nil then center_y_ratio = 0.5 end
    IM_ASSERT(center_y_ratio >= 0.0 and center_y_ratio <= 1.0)
    window.ScrollTarget.y = IM_TRUNC(local_y - window.DecoOuterSizeY1 - window.DecoInnerSizeY1 + window.Scroll.y)
    window.ScrollTargetCenterRatio.y = center_y_ratio
    window.ScrollTargetEdgeSnapDist.y = 0.0
end

---------------------------------------------------------------------------------------
-- [SECTION] TOOLTIPS
---------------------------------------------------------------------------------------

--- @param tooltip_flags      ImGuiTooltipFlags
--- @param extra_window_flags ImGuiWindowFlags
function ImGui.BeginTooltipEx(tooltip_flags, extra_window_flags)
    local g = GImGui

    local is_dragdrop_tooltip = g.DragDropWithinSource or g.DragDropWithinTarget
    if is_dragdrop_tooltip then
        local is_touchscreen = (g.IO.MouseSource == ImGuiMouseSource.TouchScreen)

        if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasPos) == 0 then
            local tooltip_pos
            if is_touchscreen then
                tooltip_pos = g.IO.MousePos + TOOLTIP_DEFAULT_OFFSET_TOUCH * g.Style.MouseCursorScale
            else
                tooltip_pos = g.IO.MousePos + TOOLTIP_DEFAULT_OFFSET_MOUSE * g.Style.MouseCursorScale
            end

            local tooltip_pivot = is_touchscreen and TOOLTIP_DEFAULT_PIVOT_TOUCH or ImVec2(0.0, 0.0)
            ImGui.SetNextWindowPos(tooltip_pos, ImGuiCond.None, tooltip_pivot)
        end

        local bg_alpha = g.Style.Colors[ImGuiCol.PopupBg].w * 0.60
        ImGui.SetNextWindowBgAlpha(bg_alpha)

        tooltip_flags = bit32.bor(tooltip_flags, ImGuiTooltipFlags.OverridePrevious)
    end

    if (bit32.band(tooltip_flags, ImGuiTooltipFlags.OverridePrevious) ~= 0) and g.TooltipPreviousWindow ~= nil and g.TooltipPreviousWindow.Active and not ImGui.IsWindowInBeginStack(g.TooltipPreviousWindow) then
        -- IMGUI_DEBUG_LOG("[tooltip] '%s' already active, using +1 for this frame\n", window_name)
        ImGui.SetWindowHiddenAndSkipItemsForCurrentFrame(g.TooltipPreviousWindow)
        g.TooltipOverrideCount = g.TooltipOverrideCount + 1
    end

    local window_name_template = is_dragdrop_tooltip and "##Tooltip_DragDrop_%02d" or "##Tooltip_%02d"
    local window_name = ImFormatString(window_name_template, g.TooltipOverrideCount)

    local flags = bit32.bor(ImGuiWindowFlags.Tooltip, ImGuiWindowFlags.NoInputs, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoSavedSettings, ImGuiWindowFlags.AlwaysAutoResize)

    ImGui.Begin(window_name, nil, bit32.bor(flags, extra_window_flags))

    return true
end

function ImGui.BeginTooltip()
    return ImGui.BeginTooltipEx(ImGuiTooltipFlags.None, ImGuiWindowFlags.None)
end

function ImGui.BeginItemTooltip()
    if not ImGui.IsItemHovered(ImGuiHoveredFlags.ForTooltip) then
        return false
    end
    return ImGui.BeginTooltipEx(ImGuiTooltipFlags.None, ImGuiWindowFlags.None)
end

function ImGui.EndTooltip()
    IM_ASSERT(bit32.band(ImGui.GetCurrentWindowRead().Flags, ImGuiWindowFlags.Tooltip) ~= 0) -- Mismatched BeginTooltip()/EndTooltip() calls
    ImGui.End()
end

--- @param fmt string
--- @param ... any
function ImGui.SetTooltip(fmt, ...)
    if not ImGui.BeginTooltipEx(ImGuiTooltipFlags.OverridePrevious, ImGuiWindowFlags.None) then
        return
    end
    ImGui.TextV(fmt, ...)
    ImGui.EndTooltip()
end

--- @param fmt string
--- @param ... any
function ImGui.SetItemTooltip(fmt, ...)
    if ImGui.IsItemHovered(ImGuiHoveredFlags.ForTooltip) then
        ImGui.SetTooltip(fmt, ...)
    end
end

---------------------------------------------------------------------------------------
-- [SECTION] POPUPS
---------------------------------------------------------------------------------------

--- @param window? ImGuiWindow
function ImGui.FindBlockingModal(window)
    local g = GImGui
    if g.OpenPopupStack.Size <= 0 then
        return nil
    end

    for i = 1, g.OpenPopupStack.Size do
        repeat
        local popup_data = g.OpenPopupStack.Data[i]
        local popup_window = popup_data.Window
        if popup_window == nil or bit32.band(popup_window.Flags, ImGuiWindowFlags.Modal) == 0 then
            break
        end
        if not popup_window.Active and not popup_window.WasActive then
            break
        end
        if window == nil then
            return popup_window
        end
        if ImGui.IsWindowWithinBeginStackOf(window, popup_window) then
            break
        end

        do return popup_window end

        until true
    end
    return nil
end

--- @param id           ImGuiID|string
--- @param popup_flags? ImGuiPopupFlags
function ImGui.OpenPopup(id, popup_flags)
    if popup_flags == nil then popup_flags = 0 end

    if type(id) == "number" then
        return ImGui.OpenPopupEx(id, popup_flags)
    else --- @cast id string
        local g = GImGui
        local _id = g.CurrentWindow:GetID(id)
        IMGUI_DEBUG_LOG_POPUP("[popup] OpenPopup(\"%s\" -> 0x%08X)", id, _id)
        return ImGui.OpenPopupEx(_id, popup_flags)
    end
end

--- @param id          ImGuiID
--- @param popup_flags ImGuiPopupFlags
function ImGui.OpenPopupEx(id, popup_flags)
    local g = GImGui
    local parent_window = g.CurrentWindow
    local current_stack_size = g.BeginPopupStack.Size

    if bit32.band(popup_flags, ImGuiPopupFlags.NoOpenOverExistingPopup) ~= 0 then
        if ImGui.IsPopupOpen(0, ImGuiPopupFlags.AnyPopupId) then
            return false
        end
    end

    local popup_ref = ImGuiPopupData()
    popup_ref.PopupId = id
    popup_ref.Window = nil
    popup_ref.RestoreNavWindow = g.NavWindow -- When popup closes focus may be restored to NavWindow (depend on window type).
    popup_ref.OpenFrameCount = g.FrameCount
    popup_ref.OpenParentId = parent_window.IDStack:back()
    ImVec2_Copy(popup_ref.OpenPopupPos, ImGui.NavCalcPreferredRefPos(ImGuiWindowFlags.Popup))
    if ImGui.IsMousePosValid(g.IO.MousePos) then
        ImVec2_Copy(popup_ref.OpenMousePos, g.IO.MousePos)
    else
        ImVec2_Copy(popup_ref.OpenMousePos, popup_ref.OpenPopupPos)
    end

    -- IMGUI_DEBUG_LOG_POPUP("[popup] OpenPopupEx(0x%08X)", id)
    if g.OpenPopupStack.Size < current_stack_size + 1 then
        g.OpenPopupStack:push_back(popup_ref)
        return true
    else
        -- Gently handle the user mistakenly calling OpenPopup() every frames: it is likely a programming mistake!
        -- However, if we were to run the regular code path, the ui would become completely unusable because the popup will always be
        -- in hidden-while-calculating-size state _while_ claiming focus. Which is extremely confusing situation for the programmer.
        -- Instead, for successive frames calls to OpenPopup(), we silently avoid reopening even if ImGuiPopupFlags.NoReopen is not specified.

        local keep_existing = false
        if g.OpenPopupStack.Data[current_stack_size + 1].PopupId == id then
            if (g.OpenPopupStack.Data[current_stack_size + 1].OpenFrameCount == g.FrameCount - 1) or (bit32.band(popup_flags, ImGuiPopupFlags.NoReopen) ~= 0) then
                keep_existing = true
            end
        end

        if keep_existing then
            -- No reopen
            g.OpenPopupStack.Data[current_stack_size + 1].OpenFrameCount = popup_ref.OpenFrameCount
        else
            -- Reopen: close child popups if any, then flag popup for open/reopen (set position, focus, init navigation)
            ImGui.ClosePopupToLevel(current_stack_size, true)
            g.OpenPopupStack:push_back(popup_ref)
        end

        -- When reopening a popup we first refocus its parent, otherwise if its parent is itself a popup it would get closed by ClosePopupsOverWindow().
        -- This is equivalent to what ClosePopupToLevel() does.
        -- if (g.OpenPopupStack[current_stack_size + 1].PopupId == id)
        --     FocusWindow(parent_window);

        return not keep_existing
    end
end

-- When popups are stacked, clicking on a lower level popups puts focus back to it and close popups above it.
-- This function closes any popups that are over 'ref_window'.
--- @param ref_window?                         ImGuiWindow
--- @param restore_focus_to_window_under_popup bool
function ImGui.ClosePopupsOverWindow(ref_window, restore_focus_to_window_under_popup)
    local g = GImGui
    if g.OpenPopupStack.Size == 0 then
        return
    end

    -- Don't close our own child popup windows.
    -- IMGUI_DEBUG_LOG_POPUP("[popup] ClosePopupsOverWindow(\"%s\") restore_under=%d", ref_window and ref_window.Name or "<NULL>", restore_focus_to_window_under_popup)
    local popup_count_to_keep = 0
    if ref_window then
        -- Find the highest popup which is a descendant of the reference window (generally reference window = NavWindow)
        local ref_window_is_descendent_of_popup
        local stop_8041 = false
        while popup_count_to_keep < g.OpenPopupStack.Size do
            repeat
            local popup = g.OpenPopupStack.Data[popup_count_to_keep + 1]
            if not popup.Window then
                break
            end

            IM_ASSERT(bit32.band(popup.Window.Flags, ImGuiWindowFlags.Popup) ~= 0)

            -- Trim the stack unless the popup is a direct parent of the reference window (the reference window is often the NavWindow)
            -- - Clicking/Focusing Window2 won't close Popup1:
            --     Window -> Popup1 -> Window2(Ref)
            -- - Clicking/focusing Popup1 will close Popup2 and Popup3:
            --     Window -> Popup1(Ref) -> Popup2 -> Popup3
            -- - Each popups may contain child windows, which is why we compare ->RootWindow!
            --     Window -> Popup1 -> Popup1_Child -> Popup2 -> Popup2_Child
            -- We step through every popup from bottom to top to validate their position relative to reference window.
            ref_window_is_descendent_of_popup = false
            for n = popup_count_to_keep, g.OpenPopupStack.Size - 1 do
                local popup_window = g.OpenPopupStack.Data[n + 1].Window
                if popup_window and ImGui.IsWindowWithinBeginStackOf(ref_window, popup_window) then
                    ref_window_is_descendent_of_popup = true
                    break
                end
            end

            if not ref_window_is_descendent_of_popup then
                stop_8041 = true; break
            end

            until true
            if stop_8041 then break end

            popup_count_to_keep = popup_count_to_keep + 1
        end
    end
    if popup_count_to_keep < g.OpenPopupStack.Size then -- This test is not required but it allows to set a convenient breakpoint on the statement below
        -- IMGUI_DEBUG_LOG_POPUP("[popup] ClosePopupsOverWindow(\"%s\")", ref_window and ref_window.Name or "<NULL>")
        ImGui.ClosePopupToLevel(popup_count_to_keep, restore_focus_to_window_under_popup)
    end
end

--- @param remaining                           int  # 0-based
--- @param restore_focus_to_window_under_popup bool
function ImGui.ClosePopupToLevel(remaining, restore_focus_to_window_under_popup)
    local g = GImGui
    -- IMGUI_DEBUG_LOG_POPUP("[popup] ClosePopupToLevel(%d), restore_under=%d", remaining, restore_focus_to_window_under_popup)
    IM_ASSERT(remaining >= 0 and remaining < g.OpenPopupStack.Size)
    -- if bit32.band(g.DebugLogFlags, ImGuiDebugLogFlags.EventPopup) ~= 0 then
    --     for n = remaining + 1, g.OpenPopupStack.Size do
    --         local popup = g.OpenPopupStack.Data[n]
    --         IMGUI_DEBUG_LOG_POPUP("[popup] - Closing PopupID 0x%08X Window \"%s\"", popup.PopupId, popup.Window and popup.Window.Name or nil)
    --     end
    -- end

    -- Trim open popup stack
    -- FIXME: is it safer to full copy here?
    local prev_popup = g.OpenPopupStack.Data[remaining + 1]
    g.OpenPopupStack:resize(remaining)

    -- Restore focus (unless popup window was not yet submitted, and didn't have a chance to take focus anyhow. See #7325 for an edge case)
    if restore_focus_to_window_under_popup and prev_popup.Window then
        local popup_window = prev_popup.Window
        local focus_window
        if bit32.band(popup_window.Flags, ImGuiWindowFlags.ChildMenu) ~= 0 then
            focus_window = popup_window.ParentWindow
        else
            focus_window = prev_popup.RestoreNavWindow
        end

        if focus_window and not focus_window.WasActive then
            ImGui.FocusTopMostWindowUnderOne(popup_window, nil, nil, ImGuiFocusRequestFlags.RestoreFocusedChild) -- Fallback
        else
            local focus_flags = (g.NavLayer == ImGuiNavLayer.Main) and ImGuiFocusRequestFlags.RestoreFocusedChild or ImGuiFocusRequestFlags.None
            ImGui.FocusWindow(focus_window, focus_flags)
        end
    end
end

-- Close the popup we have Begin-ed into
function ImGui.CloseCurrentPopup()
    local g = GImGui
    local popup_idx = g.BeginPopupStack.Size
    if popup_idx < 1 or popup_idx > g.OpenPopupStack.Size or g.BeginPopupStack.Data[popup_idx].PopupId ~= g.OpenPopupStack.Data[popup_idx].PopupId then
        return
    end

    -- Closing a menu closes its top-most parent popup (unless a modal)
    while popup_idx > 1 do
        local popup_window = g.OpenPopupStack.Data[popup_idx].Window
        local parent_popup_window = g.OpenPopupStack.Data[popup_idx - 1].Window
        local close_parent = false
        if popup_window and bit32.band(popup_window.Flags, ImGuiWindowFlags.ChildMenu) ~= 0 then
            if parent_popup_window and not (bit32.band(parent_popup_window.Flags, ImGuiWindowFlags.MenuBar) ~= 0) then
                close_parent = true
            end
        end

        if not close_parent then
            break
        end

        popup_idx = popup_idx - 1
    end

    -- IMGUI_DEBUG_LOG_POPUP("[popup] CloseCurrentPopup %d -> %d\n", g.BeginPopupStack.Size, popup_idx)
    ImGui.ClosePopupToLevel(popup_idx - 1, true)

    -- A common pattern is to close a popup when selecting a menu item/selectable that will open another window.
    -- To improve this usage pattern, we avoid nav highlight for a single frame in the parent window.
    -- Similarly, we could avoid mouse hover highlight in this window but it is less visually problematic.
    local window = g.NavWindow
    if window then
        window.DC.NavHideHighlightOneFrame = true
    end
end

--- @param id                 ImGuiID
--- @param extra_window_flags ImGuiWindowFlags
function ImGui.BeginPopupEx(id, extra_window_flags)
    local g = GImGui
    if not ImGui.IsPopupOpen(id, ImGuiPopupFlags.None) then
        g.NextWindowData:ClearFlags()
        return false
    end

    IM_ASSERT(bit32.band(extra_window_flags, ImGuiWindowFlags.ChildMenu) == 0) -- Use BeginPopupMenuEx()
    local name = ImFormatString("##Popup_%08x", id) -- No recycling, so we can close/open during the same frame

    local is_open
    _, is_open = ImGui.Begin(name, nil, bit32.bor(extra_window_flags, ImGuiWindowFlags.Popup, ImGuiWindowFlags.NoDocking))

    if not is_open then -- NB: Begin can return false when the popup is completely clipped (e.g. zero size display)
        ImGui.EndPopup()
    end
    -- g.CurrentWindow.FocusRouteParentWindow = g.CurrentWindow.ParentWindowInBeginStack
    return is_open
end

--- @param id                 ImGuiID
--- @param label              any
--- @param extra_window_flags ImGuiWindowFlags
function ImGui.BeginPopupMenuEx(id, label, extra_window_flags)
    local g = GImGui
    if not ImGui.IsPopupOpen(id, ImGuiPopupFlags.None) then
        g.NextWindowData:ClearFlags()
        return false
    end

    if bit32.band(extra_window_flags, ImGuiWindowFlags.ChildWindow) ~= 0 and bit32.band(extra_window_flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0 then
        ImGui.SetNextWindowChildFlags(ImGuiChildFlags.AlwaysAutoResize, true)
    end

    IM_ASSERT(bit32.band(extra_window_flags, ImGuiWindowFlags.ChildMenu) ~= 0)
    local name = ImFormatString("%s###Menu_%02d", label, g.BeginMenuDepth)
    local is_open
    _, is_open = ImGui.Begin(name, nil, bit32.bor(extra_window_flags, ImGuiWindowFlags.Popup))
    if not is_open then
        ImGui.EndPopup()
    end
    return is_open
end

--- @param str_id string
--- @param flags? ImGuiWindowFlags
function ImGui.BeginPopup(str_id, flags)
    if flags == nil then flags = 0 end

    local g = GImGui
    if g.OpenPopupStack.Size <= g.BeginPopupStack.Size then -- Early out for performance
        g.NextWindowData:ClearFlags() -- We behave like Begin() and need to consume those values
        return false
    end
    flags = bit32.bor(flags, ImGuiWindowFlags.AlwaysAutoResize, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoSavedSettings)
    local id = g.CurrentWindow:GetID(str_id)
    return ImGui.BeginPopupEx(id, flags)
end

function ImGui.EndPopup()
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT_USER_ERROR_RET((bit32.band(window.Flags, ImGuiWindowFlags.Popup) ~= 0) and (g.BeginPopupStack.Size > 0), "Calling EndPopup() in wrong window!")

    -- Make all menus and popups wrap around for now, may need to expose that policy (e.g. focus scope could include wrap/loop policy flags used by new move requests)
    if g.NavWindow == window then
        ImGui.NavMoveRequestTryWrapping(window, ImGuiNavMoveFlags.LoopY)
    end

    -- Child-popups don't need to be laid out
    local backup_within_end_popup_id = g.WithinEndPopupID
    local backup_within_end_child_id = g.WithinEndChildID
    g.WithinEndPopupID = window.ID
    if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
        g.WithinEndChildID = window.ID
    end

    ImGui.End()
    g.WithinEndPopupID = backup_within_end_popup_id
    g.WithinEndChildID = backup_within_end_child_id
end

--- @param ref_pos  ImVec2
--- @param size     ImVec2
--- @param last_dir ImGuiDir
--- @param r_outer  ImRect
--- @param r_avoid  ImRect
--- @param policy   ImGuiPopupPositionPolicy
--- @return ImVec2 # Best Window Pos For Popup
--- @return int    # Updated last_dir
--- @nodiscard
function ImGui.FindBestWindowPosForPopupEx(ref_pos, size, last_dir, r_outer, r_avoid, policy)
    local base_pos_clamped

    -- Combo Box policy (we want a connecting edge)
    if policy == ImGuiPopupPositionPolicy.ComboBox then
        local dir_preferred_order = {ImGuiDir.Down, ImGuiDir.Right, ImGuiDir.Left, ImGuiDir.Up}

        for n = (last_dir ~= ImGuiDir.None) and 0 or 1, ImGuiDir.COUNT do
            repeat
            local dir = (n == 0) and last_dir or dir_preferred_order[n]

            if n ~= 0 and dir == last_dir then -- Already tried this direction?
                break
            end

            local pos
            if     dir == ImGuiDir.Down  then pos = ImVec2(r_avoid.Min.x, r_avoid.Max.y)                   -- Below, Toward Right (default)
            elseif dir == ImGuiDir.Right then pos = ImVec2(r_avoid.Min.x, r_avoid.Min.y - size.y)          -- Above, Toward Right
            elseif dir == ImGuiDir.Left  then pos = ImVec2(r_avoid.Max.x - size.x, r_avoid.Max.y)          -- Below, Toward Left
            elseif dir == ImGuiDir.Up    then pos = ImVec2(r_avoid.Max.x - size.x, r_avoid.Min.y - size.y) -- Above, Toward Left
            end

            if not r_outer:Contains(ImRect(pos, pos + size)) then
                break
            end

            last_dir = dir
            do return pos, last_dir end

            until true
        end
    end

    -- Tooltip and Default popup policy
    -- (Always first try the direction we used on the last frame, if any)
    if policy == ImGuiPopupPositionPolicy.Tooltip or policy == ImGuiPopupPositionPolicy.Default then
        local dir_preferred_order = {ImGuiDir.Right, ImGuiDir.Down, ImGuiDir.Up, ImGuiDir.Left}

        for n = (last_dir ~= ImGuiDir.None) and 0 or 1, ImGuiDir.COUNT do
            repeat
            local dir = (n == 0) and last_dir or dir_preferred_order[n]

            if n ~= 0 and dir == last_dir then
                break
            end

            local avail_w = ((dir == ImGuiDir.Left) and r_avoid.Min.x or r_outer.Max.x) - ((dir == ImGuiDir.Right) and r_avoid.Max.x or r_outer.Min.x)
            local avail_h = ((dir == ImGuiDir.Up)   and r_avoid.Min.y or r_outer.Max.y) - ((dir == ImGuiDir.Down)  and r_avoid.Max.y or r_outer.Min.y)

            -- If there's not enough room on one axis, there's no point in positioning on a side on this axis (e.g. when not enough width, use a top/bottom position to maximize available width)
            if avail_w < size.x and (dir == ImGuiDir.Left or dir == ImGuiDir.Right) then
                break
            end

            if avail_h < size.y and (dir == ImGuiDir.Up or dir == ImGuiDir.Down) then
                break
            end

            base_pos_clamped = ImClamp(ref_pos, r_outer.Min, r_outer.Max - size)
            local pos = ImVec2()
            pos.x = (dir == ImGuiDir.Left) and (r_avoid.Min.x - size.x) or ((dir == ImGuiDir.Right) and r_avoid.Max.x or base_pos_clamped.x)
            pos.y = (dir == ImGuiDir.Up)   and (r_avoid.Min.y - size.y) or ((dir == ImGuiDir.Down)  and r_avoid.Max.y or base_pos_clamped.y)

            -- Clamp top-left corner of popup
            pos.x = ImMax(pos.x, r_outer.Min.x)
            pos.y = ImMax(pos.y, r_outer.Min.y)

            last_dir = dir
            do return pos, last_dir end

            until true
        end
    end

    -- Fallback when not enough room:
    last_dir = ImGuiDir.None

    -- For tooltip we prefer avoiding the cursor at all cost even if it means that part of the tooltip won't be visible.
    if policy == ImGuiPopupPositionPolicy.Tooltip then
        return ref_pos + ImVec2(2, 2), last_dir
    end

    -- Otherwise try to keep within display
    local pos = ImVec2(ref_pos.x, ref_pos.y)
    pos.x = ImMax(ImMin(pos.x + size.x, r_outer.Max.x) - size.x, r_outer.Min.x)
    pos.y = ImMax(ImMin(pos.y + size.y, r_outer.Max.y) - size.y, r_outer.Min.y)
    return pos, last_dir
end

--- @param window ImGuiWindow
--- @return ImRect
--- @nodiscard
function ImGui.GetPopupAllowedExtentRect(window)
    local g = GImGui
    local r_screen = ImRect()

    if window.ViewportAllowPlatformMonitorExtend >= 1 then
        -- Extent with be in the frame of reference of the given viewport (so Min is likely to be negative here)
        local monitor = g.PlatformIO.Monitors.Data[window.ViewportAllowPlatformMonitorExtend]
        ImVec2_Copy(r_screen.Min, monitor.WorkPos)
        ImVec2_Copy(r_screen.Max, monitor.WorkPos + monitor.WorkSize)
    else
        -- Use the full viewport area (not work area) for popups
        r_screen = window.Viewport:GetMainRect()
    end

    local padding = g.Style.DisplaySafeAreaPadding
    r_screen:Expand(ImVec2((r_screen:GetWidth() > padding.x * 2) and -padding.x or 0.0, (r_screen:GetHeight() > padding.y * 2) and -padding.y or 0.0))

    return r_screen
end

--- @param window ImGuiWindow
--- @return ImVec2
--- @nodiscard
function ImGui.FindBestWindowPosForPopup(window)
    local g = GImGui

    local r_outer = ImGui.GetPopupAllowedExtentRect(window)

    if bit32.band(window.Flags, ImGuiWindowFlags.ChildMenu) ~= 0 then
        -- Child menus typically request _any_ position within the parent menu item, and then we move the new menu outside the parent bounds.
        -- This is how we end up with child menus appearing (most-commonly) on the right of the parent menu.
        local parent_window = window.ParentWindow
        local horizontal_overlap = g.Style.ItemInnerSpacing.x  -- We want some overlap to convey the relative depth of each menu (currently the amount of overlap is hard-coded to style.ItemSpacing.x).

        local r_avoid
        if parent_window.DC.MenuBarAppending then
            r_avoid = ImRect(-FLT_MAX, parent_window.ClipRect.Min.y, FLT_MAX, parent_window.ClipRect.Max.y)  -- Avoid parent menu-bar. If we wanted multi-line menu-bar, we may instead want to have the calling window setup e.g. a NextWindowData.PosConstraintAvoidRect field
        else
            r_avoid = ImRect(parent_window.Pos.x + horizontal_overlap, -FLT_MAX, parent_window.Pos.x + parent_window.Size.x - horizontal_overlap - parent_window.ScrollbarSizes.x, FLT_MAX)
        end

        local pos
        pos, window.AutoPosLastDirection = ImGui.FindBestWindowPosForPopupEx(window.Pos, window.Size, window.AutoPosLastDirection, r_outer, r_avoid, ImGuiPopupPositionPolicy.Default)
        return pos
    end

    if bit32.band(window.Flags, ImGuiWindowFlags.Popup) ~= 0 then
        local pos
        pos, window.AutoPosLastDirection = ImGui.FindBestWindowPosForPopupEx(window.Pos, window.Size, window.AutoPosLastDirection, r_outer, ImRect(window.Pos, window.Pos), ImGuiPopupPositionPolicy.Default)  -- Ideally we'd disable r_avoid here
        return pos
    end

    if bit32.band(window.Flags, ImGuiWindowFlags.Tooltip) ~= 0 then
        -- Position tooltip (always follows mouse + clamp within outer boundaries)
        -- FIXME:
        -- - Too many paths. One problem is that FindBestWindowPosForPopupEx() doesn't allow passing a suggested position (so touch screen path doesn't use it by default).
        -- - Drag and drop tooltips are not using this path either: BeginTooltipEx() manually sets their position.
        -- - Require some tidying up. In theory we could handle both cases in same location, but requires a bit of shuffling
        --   as drag and drop tooltips are calling SetNextWindowPos() leading to 'window_pos_set_by_api' being set in Begin().
        IM_ASSERT(g.CurrentWindow == window)
        local scale = g.Style.MouseCursorScale
        local ref_pos = ImGui.NavCalcPreferredRefPos(ImGuiWindowFlags.Tooltip)

        if g.IO.MouseSource == ImGuiMouseSource.TouchScreen and ImGui.NavCalcPreferredRefPosSource(ImGuiWindowFlags.Tooltip) == ImGuiInputSource.Mouse then
            local tooltip_pos = ref_pos + TOOLTIP_DEFAULT_OFFSET_TOUCH * scale - TOOLTIP_DEFAULT_PIVOT_TOUCH * window.Size
            if r_outer:Contains(ImRect(tooltip_pos, tooltip_pos + window.Size)) then
                return tooltip_pos
            end
        end

        local tooltip_pos = ref_pos + TOOLTIP_DEFAULT_OFFSET_MOUSE * scale
        local r_avoid
        if g.NavCursorVisible and g.NavHighlightItemUnderNav and not g.IO.ConfigNavMoveSetMousePos then
            r_avoid = ImRect(ref_pos.x - 16, ref_pos.y - 8, ref_pos.x + 16, ref_pos.y + 8)
        else
            r_avoid = ImRect(ref_pos.x - 16, ref_pos.y - 8, ref_pos.x + 24 * scale, ref_pos.y + 24 * scale)  -- FIXME: Hard-coded based on mouse cursor shape expectation. Exact dimension not very important.
        end

        local pos
        pos, window.AutoPosLastDirection = ImGui.FindBestWindowPosForPopupEx(tooltip_pos, window.Size, window.AutoPosLastDirection, r_outer, r_avoid, ImGuiPopupPositionPolicy.Tooltip)
        return pos
    end

    IM_ASSERT(false)

    return window.Pos
end

--- @param flags ImGuiPopupFlags
--- @return ImGuiMouseButton
function ImGui.GetMouseButtonFromPopupFlags(flags)
    IM_ASSERT(bit32.band(flags, ImGuiPopupFlags.InvalidMask_) == 0)

    if bit32.band(flags, ImGuiPopupFlags.MouseButtonMask_) ~= 0 then
        return bit32.rshift(bit32.band(flags, ImGuiPopupFlags.MouseButtonMask_), ImGuiPopupFlags.MouseButtonShift_) - 1
    end

    return ImGuiMouseButton.Right -- Default == 1
end

--- @param popup_flags ImGuiPopupFlags
--- @param id          ImGuiID
function ImGui.IsPopupOpenRequestForItem(popup_flags, id)
    local g = GImGui
    local mouse_button = ImGui.GetMouseButtonFromPopupFlags(popup_flags)
    if ImGui.IsMouseReleased(mouse_button) and ImGui.IsItemHovered(ImGuiHoveredFlags.AllowWhenBlockedByPopup) then
        return true
    end
    if g.NavOpenContextMenuItemId == id and (ImGui.IsItemFocused() or id == g.CurrentWindow.MoveId) then
        return true
    end
    return false
end

--- @param str_id?      string
--- @param popup_flags? ImGuiPopupFlags
function ImGui.OpenPopupOnItemClick(str_id, popup_flags)
    if popup_flags == nil then popup_flags = 0 end

    local g = GImGui
    if ImGui.IsPopupOpenRequestForItem(popup_flags, g.LastItemData.ID) then
        local window = g.CurrentWindow
        local id
        if str_id then id = window:GetID(str_id) else id = g.LastItemData.ID end
        IM_ASSERT(id ~= 0)
        return ImGui.OpenPopupEx(id, popup_flags)
    end

    return false
end

--- @param str_id?      string
--- @param popup_flags? ImGuiPopupFlags
--- @return bool
function ImGui.BeginPopupContextItem(str_id, popup_flags)
    if popup_flags == nil then popup_flags = 0 end

    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then
        return false
    end
    local id
    if str_id then id = window:GetID(str_id) else id = g.LastItemData.ID end
    IM_ASSERT(id ~= 0)
    if ImGui.IsPopupOpenRequestForItem(popup_flags, g.LastItemData.ID) then
        ImGui.OpenPopupEx(id, popup_flags)
    end
    return ImGui.BeginPopupEx(id, bit32.bor(ImGuiWindowFlags.AlwaysAutoResize, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoSavedSettings))
end

---------------------------------------------------------------------------------------
-- [SECTION] NAVIGATION
---------------------------------------------------------------------------------------

--- @param id ImGuiID
function ImGui.PushFocusScope(id)
    local g = GImGui
    local data = ImGuiFocusScopeData()
    data.ID = id
    data.WindowID = g.CurrentWindow.ID
    g.FocusScopeStack:push_back(data)
    g.CurrentFocusScopeId = id
end

function ImGui.PopFocusScope()
    local g = GImGui
    -- TODO: IM_ASSERT_USER_ERROR_RET(g.FocusScopeStack.Size > g.StackSizesInBeginForCurrentWindow.SizeOfFocusScopeStack, "Calling PopFocusScope() too many times!")
    g.FocusScopeStack:pop_back()
    if g.FocusScopeStack.Size > 0 then
        g.CurrentFocusScopeId = g.FocusScopeStack:back().ID
    else
        g.CurrentFocusScopeId = 0
    end
end

--- @param focus_scope_id ImGuiID
function ImGui.IsInNavFocusRoute(focus_scope_id)
    local g = GImGui
    if g.NavFocusScopeId == focus_scope_id then
        return true
    end
    for _, focus_scope in g.NavFocusRoute:iter() do
        if focus_scope.ID == focus_scope_id then
            return true
        end
    end
    return false
end

--- @param focus_scope_id ImGuiID
function ImGui.SetNavFocusScope(focus_scope_id)
    local g = GImGui
    g.NavFocusScopeId = focus_scope_id
    g.NavFocusRoute:resize(0)
    if focus_scope_id == 0 then
        return
    end
    IM_ASSERT(g.NavWindow ~= nil)

    if focus_scope_id == g.CurrentFocusScopeId then
        for n = g.FocusScopeStack.Size, 1, -1 do
            local data = g.FocusScopeStack.Data[n]
            if data.WindowID ~= g.CurrentWindow.ID then
                break
            end
            g.NavFocusRoute:push_back(data)
        end
    elseif focus_scope_id == g.NavWindow.NavRootFocusScopeId then
        local data = ImGuiFocusScopeData()
        data.ID = focus_scope_id
        data.WindowID = g.NavWindow.ID
        g.NavFocusRoute:push_back(data)
    else
        return
    end

    local window = g.NavWindow.ParentWindowForFocusRoute
    while window ~= nil do
        local data = ImGuiFocusScopeData()
        data.ID = window.NavRootFocusScopeId
        data.WindowID = window.ID
        g.NavFocusRoute:push_back(data)
        window = window.ParentWindowForFocusRoute
    end
    IM_ASSERT(g.NavFocusRoute.Size < 100)
end

function ImGui.SetItemDefaultFocus()
    local g = GImGui
    local window = g.CurrentWindow
    if not window.Appearing then
        return
    end
    if g.NavWindow ~= window.RootWindowForNav or (not g.NavInitRequest and g.NavInitResult.ID == 0) or g.NavLayer ~= window.DC.NavLayerCurrent then
        return
    end

    g.NavInitRequest = false
    ImGui.NavApplyItemToResult(g.NavInitResult)
    ImGui.NavUpdateAnyRequestFlag()

    if not window.ClipRect:Contains(g.LastItemData.Rect) then
        ImGui.ScrollToRectEx(window, g.LastItemData.Rect, ImGuiScrollFlags.None)
    end
end

function ImGui.SetNavCursorVisibleAfterMove()
    local g = GImGui
    if g.NavWindow and (bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.NoNavInputs) ~= 0) then
        g.NavCursorVisible = false
    elseif g.NavInputSource == ImGuiInputSource.Keyboard and (bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) == 0) then
        g.NavCursorVisible = false
    elseif g.NavInputSource == ImGuiInputSource.Gamepad and (bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.NavEnableGamepad) == 0) then
        g.NavCursorVisible = false
    elseif g.IO.ConfigNavCursorVisibleAuto then
        g.NavCursorVisible = true
    end
    g.NavHighlightItemUnderNav = true
    g.NavMousePosDirty = true
end

--- @param window? ImGuiWindow
function ImGui.SetNavWindow(window)
    local g = GImGui
    if g.NavWindow ~= window then
        -- IMGUI_DEBUG_LOG_FOCUS("[focus] SetNavWindow(\"%s\")", window and window.Name or "<NULL>")
        g.NavWindow = window
        g.NavLastValidSelectionUserData = ImGuiSelectionUserData_Invalid
    end
    g.NavInitRequest = false
    g.NavMoveSubmitted = false
    g.NavMoveScoringItems = false
    ImGui.NavUpdateAnyRequestFlag()
end

--- @param axis ImGuiAxis
function ImGui.NavClearPreferredPosForAxis(axis)
    local g = GImGui
    g.NavWindow.RootWindowForNav.NavPreferredScoringPosRel[g.NavLayer][axis] = FLT_MAX
end

--- @param id             ImGuiID
--- @param nav_layer      ImGuiNavLayer
--- @param focus_scope_id ImGuiID
--- @param rect_rel       ImRect
function ImGui.SetNavID(id, nav_layer, focus_scope_id, rect_rel)
    local g = GImGui
    IM_ASSERT(g.NavWindow ~= nil)
    IM_ASSERT(nav_layer == ImGuiNavLayer.Main or nav_layer == ImGuiNavLayer.Menu)
    g.NavId = id
    g.NavLayer = nav_layer
    ImGui.SetNavFocusScope(focus_scope_id)
    g.NavWindow.NavLastIds[nav_layer] = id
    ImRect_Copy(g.NavWindow.NavRectRel[nav_layer], rect_rel)

    ImGui.NavClearPreferredPosForAxis(ImGuiAxis.X)
    ImGui.NavClearPreferredPosForAxis(ImGuiAxis.Y)
end

--- @param nav_window ImGuiWindow
function ImGui.NavSaveLastChildNavWindowIntoParent(nav_window)
    local parent = nav_window
    while parent and parent.RootWindow ~= parent and bit32.band(parent.Flags, bit32.bor(ImGuiWindowFlags.Popup, ImGuiWindowFlags.ChildMenu)) == 0 do
        parent = parent.ParentWindow
    end
    if parent and parent ~= nav_window then
        parent.NavLastChildNavWindow = nav_window
    end
end

--- @param window ImGuiWindow
function ImGui.NavRestoreLastChildNavWindow(window)
    if window.NavLastChildNavWindow and window.NavLastChildNavWindow.WasActive then
        return window.NavLastChildNavWindow
    end
    return window
end

--- @param layer ImGuiNavLayer
function ImGui.NavRestoreLayer(layer)
    local g = GImGui
    if layer == ImGuiNavLayer.Main then
        local prev_nav_window = g.NavWindow
        g.NavWindow = ImGui.NavRestoreLastChildNavWindow(g.NavWindow)
        g.NavLastValidSelectionUserData = ImGuiSelectionUserData_Invalid
    end
    local window = g.NavWindow
    if window.NavLastIds[layer] ~= 0 then
        ImGui.SetNavID(window.NavLastIds[layer], layer, 0, window.NavRectRel[layer])
    else
        g.NavLayer = layer
        ImGui.NavInitWindow(window, true)
    end
end

--- @param id ImGuiID
function ImGui.NavHighlightActivated(id)
    local g = GImGui
    g.NavHighlightActivatedId = id
    g.NavHighlightActivatedTimer = NAV_ACTIVATE_HIGHLIGHT_TIMER
end

function ImGui.NavUpdateAnyRequestFlag()
    local g = GImGui
    g.NavAnyRequest = g.NavMoveScoringItems or g.NavInitRequest or (IMGUI_DEBUG_NAV_SCORING and g.NavWindow ~= nil)
    if g.NavAnyRequest then
        IM_ASSERT(g.NavWindow ~= nil)
    end
end

--- @param window       ImGuiWindow
--- @param force_reinit bool
function ImGui.NavInitWindow(window, force_reinit)
    local g = GImGui
    IM_ASSERT(window == g.NavWindow)

    if bit32.band(window.Flags, ImGuiWindowFlags.NoNavInputs) ~= 0 then
        g.NavId = 0
        ImGui.SetNavFocusScope(window.NavRootFocusScopeId)
        return
    end

    local init_for_nav = false
    if window == window.RootWindow or bit32.band(window.Flags, ImGuiWindowFlags.Popup) ~= 0 or window.NavLastIds[0] == 0 or force_reinit then
        init_for_nav = true
    end
    -- IMGUI_DEBUG_LOG_NAV("[nav] NavInitRequest: from NavInitWindow(), init_for_nav=%d, window=\"%s\", layer=%d", init_for_nav, window->Name, g.NavLayer)
    if init_for_nav then
        ImGui.SetNavID(0, g.NavLayer, window.NavRootFocusScopeId, ImRect())
        g.NavInitRequest = true
        g.NavInitRequestFromMove = false
        g.NavInitResult.ID = 0
        ImGui.NavUpdateAnyRequestFlag()
    else
        g.NavId = window.NavLastIds[0]
        ImGui.SetNavFocusScope(window.NavRootFocusScopeId)
    end
end

--- @param window_type ImGuiWindowFlags
--- @return ImGuiInputSource
function ImGui.NavCalcPreferredRefPosSource(window_type)
    local g = GImGui
    local window = g.NavWindow

    local activated_shortcut = g.ActiveId ~= 0 and g.ActiveIdFromShortcut and g.ActiveId == g.LastItemData.ID
    if (bit32.band(window_type, ImGuiWindowFlags.Popup) ~= 0) and activated_shortcut then
        return ImGuiInputSource.Keyboard
    end

    if not g.NavCursorVisible or not g.NavHighlightItemUnderNav or not window then
        return ImGuiInputSource.Mouse
    else
        return ImGuiInputSource.Keyboard  -- or Nav in general
    end
end

--- @param window_type ImGuiWindowFlags
--- @return ImVec2
--- @nodiscard
function ImGui.NavCalcPreferredRefPos(window_type)
    local g = GImGui
    local window = g.NavWindow
    local source = ImGui.NavCalcPreferredRefPosSource(window_type)

    if source == ImGuiInputSource.Mouse then
        -- Mouse (we need a fallback in case the mouse becomes invalid after being used)
        -- The +1.0f offset when stored by OpenPopupEx() allows reopening this or another popup (same or another mouse button) while not moving the mouse, it is pretty standard.
        -- In theory we could move that +1.0f offset in OpenPopupEx()
        local p = ImGui.IsMousePosValid(g.IO.MousePos) and g.IO.MousePos or g.MouseLastValidPos
        return ImVec2(p.x + 1.0, p.y)
    else
        -- When navigation is active and mouse is disabled, pick a position around the bottom left of the currently navigated item
        local activated_shortcut = g.ActiveId ~= 0 and g.ActiveIdFromShortcut and g.ActiveId == g.LastItemData.ID

        local ref_rect = ImRect()
        if activated_shortcut and (bit32.band(window_type, ImGuiWindowFlags.Popup) ~= 0) then
            ImRect_Copy(ref_rect, g.LastItemData.NavRect)
        elseif window ~= nil then
            ImRect_Copy(ref_rect, ImGui.WindowRectRelToAbs(window, window.NavRectRel[g.NavLayer]))
        end

        -- Take account of upcoming scrolling (maybe set mouse pos should be done in EndFrame?)
        if window ~= nil and window.LastFrameActive ~= g.FrameCount and (window.ScrollTarget.x ~= FLT_MAX or window.ScrollTarget.y ~= FLT_MAX) then
            local next_scroll = CalcNextScrollFromScrollTargetAndClamp(window)
            ref_rect:Translate(window.Scroll - next_scroll)
        end

        local pos = ImVec2(ref_rect.Min.x + ImMin(g.Style.FramePadding.x * 4, ref_rect:GetWidth()), ref_rect.Max.y - ImMin(g.Style.FramePadding.y, ref_rect:GetHeight()))
        if window ~= nil then
            local viewport = window.Viewport
            if viewport then
                pos = ImClamp(pos, viewport.Pos, viewport.Pos + viewport.Size)
            end
        end

        return ImTrunc(pos) -- ImTrunc() is important because non-integer mouse position application in backend might be lossy and result in undesirable non-zero delta.
    end
end

--- @param axis ImGuiAxis
--- @return float
function ImGui.GetNavTweakPressedAmount(axis)
    local g = GImGui
    local repeat_delay, repeat_rate = ImGui.GetTypematicRepeatRate(ImGuiInputFlags.RepeatRateNavTweak)

    local key_less, key_more
    if g.NavInputSource == ImGuiInputSource.Gamepad then
        key_less = (axis == ImGuiAxis.X) and ImGuiKey.GamepadDpadLeft or ImGuiKey.GamepadDpadUp
        key_more = (axis == ImGuiAxis.X) and ImGuiKey.GamepadDpadRight or ImGuiKey.GamepadDpadDown
    else
        key_less = (axis == ImGuiAxis.X) and ImGuiKey.LeftArrow or ImGuiKey.UpArrow
        key_more = (axis == ImGuiAxis.X) and ImGuiKey.RightArrow or ImGuiKey.DownArrow
    end

    local amount = ImGui.GetKeyPressedAmount(key_more, repeat_delay, repeat_rate) - ImGui.GetKeyPressedAmount(key_less, repeat_delay, repeat_rate)

    if amount ~= 0.0 and ImGui.IsKeyDown(key_less) and ImGui.IsKeyDown(key_more) then -- Cancel when opposite directions are held, regardless of repeat phase
        amount = 0.0
    end

    return amount
end

do

local nav_gamepad_keys_to_change_source = { ImGuiKey.GamepadFaceRight, ImGuiKey.GamepadFaceLeft, ImGuiKey.GamepadFaceUp, ImGuiKey.GamepadFaceDown, ImGuiKey.GamepadDpadRight, ImGuiKey.GamepadDpadLeft, ImGuiKey.GamepadDpadUp, ImGuiKey.GamepadDpadDown }
local nav_keyboard_keys_to_change_source = { ImGuiKey.Space, ImGuiKey.Enter, ImGuiKey.Escape, ImGuiKey.RightArrow, ImGuiKey.LeftArrow, ImGuiKey.UpArrow, ImGuiKey.DownArrow }

--- @param focus_change_dir int
function ImGui.NavUpdateWindowingTarget(focus_change_dir)
    local g = GImGui
    IM_ASSERT(g.NavWindowingTarget)
    if bit32.band(g.NavWindowingTarget.Flags, ImGuiWindowFlags.Modal) ~= 0 then
        return
    end

    local i_current = ImGui.FindWindowFocusIndex(g.NavWindowingTarget)
    local window_target = ImGui.FindWindowNavFocusable(i_current + focus_change_dir, 0, focus_change_dir)
    if window_target == nil then
        window_target = ImGui.FindWindowNavFocusable((focus_change_dir < 0) and g.WindowsFocusOrder.Size or 1, i_current, focus_change_dir)
    end
    if window_target then
        g.NavWindowingTarget = window_target
        g.NavWindowingTargetAnim = window_target
        ImVec2_CopyV(g.NavWindowingAccumDeltaPos, 0.0, 0.0)
        ImVec2_CopyV(g.NavWindowingAccumDeltaSize, 0.0, 0.0)
    end
    g.NavWindowingToggleLayer = false
end

--- @param apply_focus_window ImGuiWindow
function ImGui.NavUpdateWindowingApplyFocus(apply_focus_window)
    local g = GImGui
    if g.NavWindow == nil or apply_focus_window ~= g.NavWindow.RootWindow then
        local previous_viewport = g.NavWindow and g.NavWindow.Viewport or nil
        ImGui.ClearActiveID()
        ImGui.SetNavCursorVisibleAfterMove()
        ImGui.ClosePopupsOverWindow(apply_focus_window, false)
        ImGui.FocusWindow(apply_focus_window, ImGuiFocusRequestFlags.RestoreFocusedChild)
        IM_ASSERT(g.NavWindow ~= nil)
        apply_focus_window = g.NavWindow
        if apply_focus_window.NavLastIds[ImGuiNavLayer.Main] == 0 then
            ImGui.NavInitWindow(apply_focus_window, false)
        end

        if apply_focus_window.DC.NavLayersActiveMaskNext == bit32.lshift(1, ImGuiNavLayer.Menu) then
            g.NavLayer = ImGuiNavLayer.Menu
        end

        if apply_focus_window.Viewport ~= previous_viewport and g.PlatformIO.Platform_SetWindowFocus then
            g.PlatformIO.Platform_SetWindowFocus(apply_focus_window.Viewport)
        end
    end
    g.NavWindowingTarget = nil
end

function ImGui.NavUpdateWindowing()
    local g = GImGui
    local io = g.IO

    local apply_focus_window = nil
    local apply_toggle_layer = false

    local modal_window = ImGui.GetTopMostPopupModal()
    local allow_windowing = (modal_window == nil)
    if not allow_windowing then
        g.NavWindowingTarget = nil
    end

    if g.NavWindowingTargetAnim and g.NavWindowingTarget == nil then
        g.NavWindowingHighlightAlpha = ImMax(g.NavWindowingHighlightAlpha - io.DeltaTime * 10.0, 0.0)
        if g.DimBgRatio <= 0.0 and g.NavWindowingHighlightAlpha <= 0.0 then
            g.NavWindowingTargetAnim = nil
        end
    end

    local owner_id = ImHashStr("##NavUpdateWindowing")
    local nav_gamepad_active = bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableGamepad) ~= 0 and bit32.band(io.BackendFlags, ImGuiBackendFlags.HasGamepad) ~= 0
    local nav_keyboard_active = bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) ~= 0
    local keyboard_next_window = allow_windowing and g.ConfigNavWindowingKeyNext ~= 0 and ImGui.Shortcut(g.ConfigNavWindowingKeyNext, bit32.bor(ImGuiInputFlags.Repeat, ImGuiInputFlags.RouteAlways), owner_id)
    local keyboard_prev_window = allow_windowing and g.ConfigNavWindowingKeyPrev ~= 0 and ImGui.Shortcut(g.ConfigNavWindowingKeyPrev, bit32.bor(ImGuiInputFlags.Repeat, ImGuiInputFlags.RouteAlways), owner_id)
    local start_toggling_with_gamepad = nav_gamepad_active and g.NavWindowingTarget == nil and ImGui.Shortcut(ImGuiKey.NavGamepadMenu, ImGuiInputFlags.RouteAlways, owner_id)
    local start_windowing_with_gamepad = allow_windowing and start_toggling_with_gamepad
    local start_windowing_with_keyboard = allow_windowing and g.NavWindowingTarget == nil and (keyboard_next_window or keyboard_prev_window)
    local just_started_windowing_from_null_focus = false
    if start_toggling_with_gamepad then
        g.NavWindowingToggleLayer = true
        g.NavWindowingToggleKey = ImGuiKey.NavGamepadMenu
        g.NavWindowingInputSource = ImGuiInputSource.Gamepad
        g.NavInputSource = ImGuiInputSource.Gamepad
    end
    if start_windowing_with_gamepad or start_windowing_with_keyboard then
        local window = (g.NavWindow and ImGui.IsWindowNavFocusable(g.NavWindow)) and g.NavWindow or ImGui.FindWindowNavFocusable(g.WindowsFocusOrder.Size, 0, -1)
        if window then
            if start_windowing_with_keyboard or g.ConfigNavWindowingWithGamepad then
                g.NavWindowingTarget = window.RootWindow
                g.NavWindowingTargetAnim = window.RootWindow
            end
            g.NavWindowingTimer = 0.0
            g.NavWindowingHighlightAlpha = 0.0
            ImVec2_CopyV(g.NavWindowingAccumDeltaPos, 0.0, 0.0)
            ImVec2_CopyV(g.NavWindowingAccumDeltaSize, 0.0, 0.0)
            g.NavWindowingInputSource = start_windowing_with_keyboard and ImGuiInputSource.Keyboard or ImGuiInputSource.Gamepad
            g.NavInputSource = g.NavWindowingInputSource
            if g.NavWindow == nil then
                just_started_windowing_from_null_focus = true
            end

            if keyboard_next_window or keyboard_prev_window then
                ImGui.SetKeyOwnersForKeyChord(bit32.band(bit32.bor(g.ConfigNavWindowingKeyNext, g.ConfigNavWindowingKeyPrev), ImGuiMod_Mask_), owner_id)
            end
        end
    end

    if (g.NavWindowingTarget or g.NavWindowingToggleLayer) and g.NavWindowingInputSource == ImGuiInputSource.Gamepad then
        if g.NavWindowingTarget ~= nil then
            g.NavWindowingTimer = g.NavWindowingTimer + io.DeltaTime
            g.NavWindowingHighlightAlpha = ImMax(g.NavWindowingHighlightAlpha, ImSaturate((g.NavWindowingTimer - NAV_WINDOWING_HIGHLIGHT_DELAY) / 0.05))

            local focus_change_dir = (ImGui.IsKeyPressedEx(ImGuiKey.GamepadL1, ImGuiInputFlags.None, ImGuiKeyOwner_Any) and 1 or 0) - (ImGui.IsKeyPressedEx(ImGuiKey.GamepadR1, ImGuiInputFlags.None, ImGuiKeyOwner_Any) and 1 or 0)
            if focus_change_dir ~= 0 and not just_started_windowing_from_null_focus then
                ImGui.NavUpdateWindowingTarget(focus_change_dir)
                g.NavWindowingHighlightAlpha = 1.0
            end
        end

        if not ImGui.IsKeyDown(ImGuiKey.NavGamepadMenu) then
            g.NavWindowingToggleLayer = g.NavWindowingToggleLayer and (g.NavWindowingHighlightAlpha < 1.0)
            if g.NavWindowingToggleLayer and g.NavWindow then
                apply_toggle_layer = true
            elseif not g.NavWindowingToggleLayer then
                apply_focus_window = g.NavWindowingTarget
            end
            g.NavWindowingTarget = nil
            g.NavWindowingToggleLayer = false
        end
    end

    if g.NavWindowingTarget and g.NavWindowingInputSource == ImGuiInputSource.Keyboard then
        local shared_mods = bit32.band(
            bit32.band((g.ConfigNavWindowingKeyNext ~= 0) and g.ConfigNavWindowingKeyNext or ImGuiMod_Mask_, (g.ConfigNavWindowingKeyPrev ~= 0) and g.ConfigNavWindowingKeyPrev or ImGuiMod_Mask_),
            ImGuiMod_Mask_)
        IM_ASSERT(shared_mods ~= 0)
        g.NavWindowingTimer = g.NavWindowingTimer + io.DeltaTime
        g.NavWindowingHighlightAlpha = ImMax(g.NavWindowingHighlightAlpha, ImSaturate((g.NavWindowingTimer - NAV_WINDOWING_HIGHLIGHT_DELAY) / 0.05))
        if (keyboard_next_window or keyboard_prev_window) and not just_started_windowing_from_null_focus then
            ImGui.NavUpdateWindowingTarget(keyboard_next_window and -1 or 1)
        elseif bit32.band(io.KeyMods, shared_mods) ~= shared_mods then
            apply_focus_window = g.NavWindowingTarget
        end
    end

    local windowing_toggle_keys = { ImGuiKey.LeftAlt, ImGuiKey.RightAlt }
    local windowing_toggle_layer_start = false
    if g.NavWindow and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.NoNavInputs) == 0 then
        for _, windowing_toggle_key in ipairs(windowing_toggle_keys) do
            if nav_keyboard_active and ImGui.IsKeyPressedEx(windowing_toggle_key, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner) then
                windowing_toggle_layer_start = true
                g.NavWindowingToggleLayer = true
                g.NavWindowingToggleKey = windowing_toggle_key
                g.NavWindowingInputSource = ImGuiInputSource.Keyboard
                g.NavInputSource = ImGuiInputSource.Keyboard
                break
            end
        end
    end
    if g.NavWindowingToggleLayer and g.NavWindowingInputSource == ImGuiInputSource.Keyboard then
        if io.InputQueueCharacters.Size > 0 or io.KeyCtrl or io.KeyShift or io.KeySuper then
            g.NavWindowingToggleLayer = false
        elseif windowing_toggle_layer_start == false and g.LastKeyboardKeyPressTime == g.Time then
            g.NavWindowingToggleLayer = false
        elseif ImGui.TestKeyOwner(g.NavWindowingToggleKey, ImGuiKeyOwner_NoOwner) == false or ImGui.TestKeyOwner(ImGuiMod_Alt, ImGuiKeyOwner_NoOwner) == false then
            g.NavWindowingToggleLayer = false
        end

        if ImGui.IsKeyReleased(g.NavWindowingToggleKey) and g.NavWindowingToggleLayer then
            if g.ActiveId == 0 or g.ActiveIdAllowOverlap then
                if ImGui.IsMousePosValid(io.MousePos) == ImGui.IsMousePosValid(io.MousePosPrev) then
                    apply_toggle_layer = true
                end
            end
        end
        if not ImGui.IsKeyDown(g.NavWindowingToggleKey) then
            g.NavWindowingToggleLayer = false
        end
    end

    if g.NavWindowingTarget and bit32.band(g.NavWindowingTarget.Flags, ImGuiWindowFlags.NoMove) == 0 then
        local nav_move_dir
        if g.NavInputSource == ImGuiInputSource.Keyboard and not io.KeyShift then
            nav_move_dir = ImGui.GetKeyMagnitude2d(ImGuiKey.LeftArrow, ImGuiKey.RightArrow, ImGuiKey.UpArrow, ImGuiKey.DownArrow)
        end
        if g.NavInputSource == ImGuiInputSource.Gamepad then
            nav_move_dir = ImGui.GetKeyMagnitude2d(ImGuiKey.GamepadLStickLeft, ImGuiKey.GamepadLStickRight, ImGuiKey.GamepadLStickUp, ImGuiKey.GamepadLStickDown)
        end
        if nav_move_dir and (nav_move_dir.x ~= 0.0 or nav_move_dir.y ~= 0.0) then
            local NAV_MOVE_SPEED = 800.0
            local move_step = NAV_MOVE_SPEED * io.DeltaTime * ImGui.GetScale()
            ImVec2_Copy(g.NavWindowingAccumDeltaPos, g.NavWindowingAccumDeltaPos + nav_move_dir * move_step)
            g.NavHighlightItemUnderNav = true
            local accum_floored = ImTrunc(g.NavWindowingAccumDeltaPos)
            if accum_floored.x ~= 0.0 or accum_floored.y ~= 0.0 then
                local moving_window = g.NavWindowingTarget.RootWindowDockTree
                ImGui.SetWindowPos(moving_window, moving_window.Pos + accum_floored, ImGuiCond.Always)
                ImVec2_Copy(g.NavWindowingAccumDeltaPos, g.NavWindowingAccumDeltaPos - accum_floored)
            end
        end
    end

    if apply_focus_window then
        ImGui.NavUpdateWindowingApplyFocus(apply_focus_window)
    end

    if apply_toggle_layer and g.NavWindow then
        ImGui.ClearActiveID()

        local new_nav_window = g.NavWindow
        while new_nav_window.ParentWindow
            and bit32.band(new_nav_window.DC.NavLayersActiveMask, bit32.lshift(1, ImGuiNavLayer.Menu)) == 0
            and bit32.band(new_nav_window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0
            and bit32.band(new_nav_window.Flags, bit32.bor(ImGuiWindowFlags.Popup, ImGuiWindowFlags.ChildMenu)) == 0 do
            new_nav_window = new_nav_window.ParentWindow
        end
        if new_nav_window ~= g.NavWindow then
            local old_nav_window = g.NavWindow
            ImGui.FocusWindow(new_nav_window)
            new_nav_window.NavLastChildNavWindow = old_nav_window
        end

        local new_nav_layer = (bit32.band(g.NavWindow.DC.NavLayersActiveMask, bit32.lshift(1, ImGuiNavLayer.Menu)) ~= 0) and bit32.bxor(g.NavLayer, 1) or ImGuiNavLayer.Main
        if new_nav_layer ~= g.NavLayer then
            local preserve_layer_1_nav_id = (new_nav_window.DockNodeAsHost ~= nil)
            if new_nav_layer == ImGuiNavLayer.Menu and not preserve_layer_1_nav_id then
                g.NavWindow.NavLastIds[new_nav_layer] = 0
            end
            ImGui.NavRestoreLayer(new_nav_layer)
            ImGui.SetNavCursorVisibleAfterMove()
        end
    end
end

function ImGui.NavUpdateContextMenuRequest()
    local g = GImGui
    local io = g.IO
    g.NavOpenContextMenuItemId = 0
    g.NavOpenContextMenuWindowId = 0
    local nav_keyboard_active = bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) ~= 0
    local nav_gamepad_active = bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableGamepad) ~= 0
    if (not nav_keyboard_active and not nav_gamepad_active) or g.NavWindow == nil then
        return
    end

    local request = false
    request = request or (nav_keyboard_active and (ImGui.IsKeyReleased(ImGuiKey.Menu, ImGuiKeyOwner_NoOwner) or (ImGui.IsKeyPressedEx(ImGuiKey.F10, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner) and io.KeyMods == ImGuiMod_Shift)))
    request = request or (nav_gamepad_active and ImGui.IsKeyPressedEx(ImGuiKey.NavGamepadContextMenu, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner))
    if not request then
        return
    end

    g.NavOpenContextMenuItemId = g.NavId
    g.NavOpenContextMenuWindowId = g.NavWindow.ID

    if g.NavId == g.NavWindow:GetID("#CLOSE") or g.NavId == g.NavWindow:GetID("#COLLAPSE") then
        g.NavOpenContextMenuItemId = g.NavWindow.MoveId
    end

    g.NavInputSource = ImGuiInputSource.Keyboard
    ImGui.SetNavCursorVisibleAfterMove()
end

--- @param move_dir     ImGuiDir
--- @param clip_dir     ImGuiDir
--- @param move_flags   ImGuiNavMoveFlags
--- @param scroll_flags ImGuiScrollFlags
function ImGui.NavMoveRequestSubmit(move_dir, clip_dir, move_flags, scroll_flags)
    local g = GImGui
    IM_ASSERT(g.NavWindow ~= nil)
    if bit32.band(move_flags, ImGuiNavMoveFlags.IsTabbing) ~= 0 then
        move_flags = bit32.bor(move_flags, ImGuiNavMoveFlags.AllowCurrentNavId)
    end
    g.NavMoveSubmitted = true; g.NavMoveScoringItems = true
    g.NavMoveDir = move_dir
    g.NavMoveDirForDebug = move_dir
    g.NavMoveClipDir = clip_dir
    g.NavMoveFlags = move_flags
    g.NavMoveScrollFlags = scroll_flags
    g.NavMoveForwardToNextFrame = false
    g.NavMoveKeyMods = (bit32.band(move_flags, ImGuiNavMoveFlags.FocusApi) ~= 0) and 0 or g.IO.KeyMods
    g.NavMoveResultLocal:Clear()
    g.NavMoveResultLocalVisible:Clear()
    g.NavMoveResultOther:Clear()
    g.NavTabbingCounter = 0
    g.NavTabbingResultFirst:Clear()
    ImGui.NavUpdateAnyRequestFlag()
end

--- @param r                 ImRect
--- @param preferred_pos_rel ImVec2
--- @param move_dir          ImGuiDir
--- @param move_flags        ImGuiNavMoveFlags
function ImGui.NavBiasScoringRect(r, preferred_pos_rel, move_dir, move_flags)
    local g = GImGui
    local rel_to_abs_offset = g.NavWindow.DC.CursorStartPos
    if bit32.band(move_flags, ImGuiNavMoveFlags.Forwarded) == 0 then
        if preferred_pos_rel.x == FLT_MAX then
            preferred_pos_rel.x = ImMin(r.Min.x + 1.0, r.Max.x) - rel_to_abs_offset.x
        end
        if preferred_pos_rel.y == FLT_MAX then
            preferred_pos_rel.y = r:GetCenter().y - rel_to_abs_offset.y
        end
    end
    if (move_dir == ImGuiDir.Up or move_dir == ImGuiDir.Down) and preferred_pos_rel.x ~= FLT_MAX then
        local new_x = preferred_pos_rel.x + rel_to_abs_offset.x
        r.Min.x = new_x; r.Max.x = new_x
    elseif (move_dir == ImGuiDir.Left or move_dir == ImGuiDir.Right) and preferred_pos_rel.y ~= FLT_MAX then
        local new_y = preferred_pos_rel.y + rel_to_abs_offset.y
        r.Min.y = new_y; r.Max.y = new_y
    end
end

--- @return float
function ImGui.NavUpdatePageUpPageDown()
    local g = GImGui
    local window = g.NavWindow
    if bit32.band(window.Flags, ImGuiWindowFlags.NoNavInputs) ~= 0 or g.NavWindowingTarget ~= nil then
        return 0.0
    end

    local page_up_held = ImGui.IsKeyDown(ImGuiKey.PageUp, ImGuiKeyOwner_NoOwner)
    local page_down_held = ImGui.IsKeyDown(ImGuiKey.PageDown, ImGuiKeyOwner_NoOwner)
    local home_pressed = ImGui.IsKeyPressedEx(ImGuiKey.Home, ImGuiInputFlags.Repeat, ImGuiKeyOwner_NoOwner)
    local end_pressed = ImGui.IsKeyPressedEx(ImGuiKey.End, ImGuiInputFlags.Repeat, ImGuiKeyOwner_NoOwner)
    if page_up_held == page_down_held and home_pressed == end_pressed then
        return 0.0
    end

    if g.NavLayer ~= ImGuiNavLayer.Main then
        ImGui.NavRestoreLayer(ImGuiNavLayer.Main)
    end

    if bit32.band(window.DC.NavLayersActiveMask, bit32.lshift(1, ImGuiNavLayer.Main)) == 0 and window.DC.NavWindowHasScrollY then
        if ImGui.IsKeyPressedEx(ImGuiKey.PageUp, ImGuiInputFlags.Repeat, ImGuiKeyOwner_NoOwner) then
            ImGui.SetScrollY(window, window.Scroll.y - window.InnerRect:GetHeight())
        elseif ImGui.IsKeyPressedEx(ImGuiKey.PageDown, ImGuiInputFlags.Repeat, ImGuiKeyOwner_NoOwner) then
            ImGui.SetScrollY(window, window.Scroll.y + window.InnerRect:GetHeight())
        elseif home_pressed then
            ImGui.SetScrollY(window, 0.0)
        elseif end_pressed then
            ImGui.SetScrollY(window, window.ScrollMax.y)
        end
    else
        local nav_rect_rel = window.NavRectRel[g.NavLayer]
        local page_offset_y = ImMax(0.0, window.InnerRect:GetHeight() - window.FontRefSize * 1.0 + nav_rect_rel:GetHeight())
        local nav_scoring_rect_offset_y = 0.0
        if ImGui.IsKeyPressedEx(ImGuiKey.PageUp, ImGuiInputFlags.Repeat, ImGuiKeyOwner_NoOwner) then
            nav_scoring_rect_offset_y = -page_offset_y
            g.NavMoveDir = ImGuiDir.Down
            g.NavMoveClipDir = ImGuiDir.Up
            g.NavMoveFlags = bit32.bor(ImGuiNavMoveFlags.AllowCurrentNavId, ImGuiNavMoveFlags.IsPageMove)
        elseif ImGui.IsKeyPressedEx(ImGuiKey.PageDown, ImGuiInputFlags.Repeat, ImGuiKeyOwner_NoOwner) then
            nav_scoring_rect_offset_y = page_offset_y
            g.NavMoveDir = ImGuiDir.Up
            g.NavMoveClipDir = ImGuiDir.Down
            g.NavMoveFlags = bit32.bor(ImGuiNavMoveFlags.AllowCurrentNavId, ImGuiNavMoveFlags.IsPageMove)
        elseif home_pressed then
            nav_rect_rel.Min.y = 0.0; nav_rect_rel.Max.y = 0.0
            if nav_rect_rel:IsInverted() then
                nav_rect_rel.Min.x = 0.0; nav_rect_rel.Max.x = 0.0
            end
            g.NavMoveDir = ImGuiDir.Down
            g.NavMoveFlags = bit32.bor(ImGuiNavMoveFlags.AllowCurrentNavId, ImGuiNavMoveFlags.ScrollToEdgeY)
        elseif end_pressed then
            nav_rect_rel.Min.y = window.ContentSize.y; nav_rect_rel.Max.y = window.ContentSize.y
            if nav_rect_rel:IsInverted() then
                nav_rect_rel.Min.x = 0.0; nav_rect_rel.Max.x = 0.0
            end
            g.NavMoveDir = ImGuiDir.Up
            g.NavMoveFlags = bit32.bor(ImGuiNavMoveFlags.AllowCurrentNavId, ImGuiNavMoveFlags.ScrollToEdgeY)
        end
        return nav_scoring_rect_offset_y
    end
    return 0.0
end

function ImGui.NavUpdateCreateMoveRequest()
    local g = GImGui
    local io = g.IO
    local window = g.NavWindow
    local nav_gamepad_active = bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableGamepad) ~= 0 and bit32.band(io.BackendFlags, ImGuiBackendFlags.HasGamepad) ~= 0
    local nav_keyboard_active = bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) ~= 0

    if g.NavMoveForwardToNextFrame and window ~= nil then
        IM_ASSERT(g.NavMoveDir ~= ImGuiDir.None and g.NavMoveClipDir ~= ImGuiDir.None)
        IM_ASSERT(bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.Forwarded) ~= 0)
    else
        g.NavMoveDir = ImGuiDir.None
        g.NavMoveFlags = ImGuiNavMoveFlags.None
        g.NavMoveScrollFlags = ImGuiScrollFlags.None
        if window and not g.NavWindowingTarget and bit32.band(window.Flags, ImGuiWindowFlags.NoNavInputs) == 0 then
            local repeat_mode = bit32.bor(ImGuiInputFlags.Repeat, ImGuiInputFlags.RepeatRateNavMove)
            if not ImGui.IsActiveIdUsingNavDir(ImGuiDir.Left)  and ((nav_gamepad_active and ImGui.IsKeyPressedEx(ImGuiKey.GamepadDpadLeft,  repeat_mode, ImGuiKeyOwner_NoOwner)) or (nav_keyboard_active and ImGui.IsKeyPressedEx(ImGuiKey.LeftArrow,  repeat_mode, ImGuiKeyOwner_NoOwner))) then g.NavMoveDir = ImGuiDir.Left end
            if not ImGui.IsActiveIdUsingNavDir(ImGuiDir.Right) and ((nav_gamepad_active and ImGui.IsKeyPressedEx(ImGuiKey.GamepadDpadRight, repeat_mode, ImGuiKeyOwner_NoOwner)) or (nav_keyboard_active and ImGui.IsKeyPressedEx(ImGuiKey.RightArrow, repeat_mode, ImGuiKeyOwner_NoOwner))) then g.NavMoveDir = ImGuiDir.Right end
            if not ImGui.IsActiveIdUsingNavDir(ImGuiDir.Up)    and ((nav_gamepad_active and ImGui.IsKeyPressedEx(ImGuiKey.GamepadDpadUp,    repeat_mode, ImGuiKeyOwner_NoOwner)) or (nav_keyboard_active and ImGui.IsKeyPressedEx(ImGuiKey.UpArrow,    repeat_mode, ImGuiKeyOwner_NoOwner))) then g.NavMoveDir = ImGuiDir.Up end
            if not ImGui.IsActiveIdUsingNavDir(ImGuiDir.Down)  and ((nav_gamepad_active and ImGui.IsKeyPressedEx(ImGuiKey.GamepadDpadDown,  repeat_mode, ImGuiKeyOwner_NoOwner)) or (nav_keyboard_active and ImGui.IsKeyPressedEx(ImGuiKey.DownArrow,  repeat_mode, ImGuiKeyOwner_NoOwner))) then g.NavMoveDir = ImGuiDir.Down end
        end
        g.NavMoveClipDir = g.NavMoveDir
        ImRect_Copy(g.NavScoringNoClipRect, ImRect(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX))
    end

    local scoring_page_offset_y = 0.0
    if window and g.NavMoveDir == ImGuiDir.None and nav_keyboard_active then
        scoring_page_offset_y = ImGui.NavUpdatePageUpPageDown()
    end

    g.NavMoveForwardToNextFrame = false
    if g.NavMoveDir ~= ImGuiDir.None then
        ImGui.NavMoveRequestSubmit(g.NavMoveDir, g.NavMoveClipDir, g.NavMoveFlags, g.NavMoveScrollFlags)
    end

    if g.NavMoveSubmitted and g.NavId == 0 then
        g.NavInitRequest = true; g.NavInitRequestFromMove = true
        g.NavInitResult.ID = 0
        if g.IO.ConfigNavCursorVisibleAuto then
            g.NavCursorVisible = true
        end
    end

    if g.NavMoveSubmitted and g.NavInputSource == ImGuiInputSource.Gamepad and g.NavLayer == ImGuiNavLayer.Main and window ~= nil then
        local clamp_x = bit32.band(g.NavMoveFlags, bit32.bor(ImGuiNavMoveFlags.LoopX, ImGuiNavMoveFlags.WrapX)) == 0
        local clamp_y = bit32.band(g.NavMoveFlags, bit32.bor(ImGuiNavMoveFlags.LoopY, ImGuiNavMoveFlags.WrapY)) == 0
        local inner_rect_rel = ImGui.WindowRectAbsToRel(window, ImRect(ImVec2(window.InnerRect.Min.x - 1, window.InnerRect.Min.y - 1), ImVec2(window.InnerRect.Max.x + 1, window.InnerRect.Max.y + 1)))
        local next_scroll = CalcNextScrollFromScrollTargetAndClamp(window)
        inner_rect_rel:Translate(ImVec2(next_scroll.x - window.Scroll.x, next_scroll.y - window.Scroll.y))
        if (clamp_x or clamp_y) and not inner_rect_rel:Contains(window.NavRectRel[g.NavLayer]) then
            local pad_x = ImMin(inner_rect_rel:GetWidth(), window.FontRefSize * 0.5)
            local pad_y = ImMin(inner_rect_rel:GetHeight(), window.FontRefSize * 0.5)
            inner_rect_rel.Min.x = clamp_x and (inner_rect_rel.Min.x + pad_x) or -FLT_MAX
            inner_rect_rel.Max.x = clamp_x and (inner_rect_rel.Max.x - pad_x) or FLT_MAX
            inner_rect_rel.Min.y = clamp_y and (inner_rect_rel.Min.y + pad_y) or -FLT_MAX
            inner_rect_rel.Max.y = clamp_y and (inner_rect_rel.Max.y - pad_y) or FLT_MAX
            window.NavRectRel[g.NavLayer]:ClipWithFull(inner_rect_rel)
            g.NavId = 0
        end
    end

    local scoring_rect = ImRect()
    if window ~= nil then
        local nav_rect_rel = ImRect()
        if not window.NavRectRel[g.NavLayer]:IsInverted() then
            ImRect_Copy(nav_rect_rel, window.NavRectRel[g.NavLayer])
        end
        scoring_rect = ImGui.WindowRectRelToAbs(window, nav_rect_rel)

        if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsPageMove) ~= 0 then
            if window.InnerRect:Contains(scoring_rect) then
                g.NavMoveFlags = bit32.bor(g.NavMoveFlags, ImGuiNavMoveFlags.AlsoScoreVisibleSet)
            end
            ImRect_Copy(g.NavScoringNoClipRect, scoring_rect)
            scoring_rect:TranslateY(scoring_page_offset_y)
            g.NavScoringNoClipRect:Add(scoring_rect)
        end

        if g.NavMoveSubmitted then
            ImGui.NavBiasScoringRect(scoring_rect, window.RootWindowForNav.NavPreferredScoringPosRel[g.NavLayer], g.NavMoveDir, g.NavMoveFlags)
        end
        IM_ASSERT(not scoring_rect:IsInverted())
    end
    ImRect_Copy(g.NavScoringRect, scoring_rect)
end

function ImGui.NavUpdateCreateTabbingRequest()
    local g = GImGui
    local window = g.NavWindow
    IM_ASSERT(g.NavMoveDir == ImGuiDir.None)
    if window == nil or g.NavWindowingTarget ~= nil or bit32.band(window.Flags, ImGuiWindowFlags.NoNavInputs) ~= 0 or not g.ConfigNavEnableTabbing then
        return
    end

    local tab_pressed = ImGui.IsKeyPressedEx(ImGuiKey.Tab, ImGuiInputFlags.Repeat, ImGuiKeyOwner_NoOwner) and not g.IO.KeyCtrl and not g.IO.KeyAlt
    if not tab_pressed then
        return
    end

    local nav_keyboard_active = bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) ~= 0
    if nav_keyboard_active then
        g.NavTabbingDir = g.IO.KeyShift and -1 or ((g.NavCursorVisible == false and g.ActiveId == 0) and 0 or 1)
    else
        g.NavTabbingDir = g.IO.KeyShift and -1 or ((g.ActiveId == 0) and 0 or 1)
    end
    local move_flags = bit32.bor(ImGuiNavMoveFlags.IsTabbing, ImGuiNavMoveFlags.Activate)
    local scroll_flags = window.Appearing and bit32.bor(ImGuiScrollFlags.KeepVisibleEdgeX, ImGuiScrollFlags.AlwaysCenterY) or bit32.bor(ImGuiScrollFlags.KeepVisibleEdgeX, ImGuiScrollFlags.KeepVisibleEdgeY)
    local clip_dir = (g.NavTabbingDir < 0) and ImGuiDir.Up or ImGuiDir.Down
    ImGui.NavMoveRequestSubmit(ImGuiDir.None, clip_dir, move_flags, scroll_flags)
    g.NavTabbingCounter = -1
end

function ImGui.NavUpdate()
    local g = GImGui
    local io = g.IO

    io.WantSetMousePos = false

    local nav_gamepad_active = bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableGamepad) ~= 0 and bit32.band(io.BackendFlags, ImGuiBackendFlags.HasGamepad) ~= 0
    if nav_gamepad_active and g.NavInputSource ~= ImGuiInputSource.Gamepad then
        for _, key in ipairs(nav_gamepad_keys_to_change_source) do
            if ImGui.IsKeyDown(key) then
                g.NavInputSource = ImGuiInputSource.Gamepad
            end
        end
    end

    local nav_keyboard_active = bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) ~= 0
    if nav_keyboard_active and g.NavInputSource ~= ImGuiInputSource.Keyboard then
        for _, key in ipairs(nav_keyboard_keys_to_change_source) do
            if ImGui.IsKeyDown(key) then
                g.NavInputSource = ImGuiInputSource.Keyboard
            end
        end
    end

    g.NavJustMovedToId = 0
    g.NavJustMovedToFocusScopeId = 0
    g.NavJustMovedFromFocusScopeId = 0
    if g.NavInitResult.ID ~= 0 then
        ImGui.NavInitRequestApplyResult()
    end
    g.NavInitRequest = false
    g.NavInitRequestFromMove = false
    g.NavInitResult.ID = 0

    if g.NavMoveSubmitted then
        ImGui.NavMoveRequestApplyResult()
    end
    g.NavTabbingCounter = 0
    g.NavMoveSubmitted = false
    g.NavMoveScoringItems = false
    if g.NavCursorHideFrames > 0 then
        g.NavCursorHideFrames = g.NavCursorHideFrames - 1
        if g.NavCursorHideFrames == 0 then
            g.NavCursorVisible = true
        end
    end

    local set_mouse_pos = false
    if g.NavMousePosDirty and g.NavIdIsAlive then
        if g.NavCursorVisible and g.NavHighlightItemUnderNav and g.NavWindow then
            set_mouse_pos = true
        end
    end
    g.NavMousePosDirty = false
    IM_ASSERT(g.NavLayer == ImGuiNavLayer.Main or g.NavLayer == ImGuiNavLayer.Menu)

    if g.NavWindow then
        ImGui.NavSaveLastChildNavWindowIntoParent(g.NavWindow)
    end
    if g.NavWindow and g.NavWindow.NavLastChildNavWindow ~= nil and g.NavLayer == ImGuiNavLayer.Main then
        g.NavWindow.NavLastChildNavWindow = nil
    end

    ImGui.NavUpdateWindowing()

    io.NavActive = (nav_keyboard_active or nav_gamepad_active) and g.NavWindow and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.NoNavInputs) == 0
    io.NavVisible = (io.NavActive and g.NavId ~= 0 and g.NavCursorVisible) or (g.NavWindowingTarget ~= nil)

    ImGui.NavUpdateCancelRequest()
    ImGui.NavUpdateContextMenuRequest()

    g.NavActivateId = 0
    g.NavActivateDownId = 0
    g.NavActivatePressedId = 0
    g.NavActivateFlags = ImGuiActivateFlags.None

    if g.NavId ~= 0 and g.NavCursorVisible and not g.NavWindowingTarget and g.NavWindow and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.NoNavInputs) == 0 then
        local activate_down = (nav_keyboard_active and ImGui.IsKeyDown(ImGuiKey.Space, ImGuiKeyOwner_NoOwner)) or (nav_gamepad_active and ImGui.IsKeyDown(ImGuiKey.NavGamepadActivate, ImGuiKeyOwner_NoOwner))
        local activate_pressed = activate_down and ((nav_keyboard_active and ImGui.IsKeyPressedEx(ImGuiKey.Space, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner)) or (nav_gamepad_active and ImGui.IsKeyPressedEx(ImGuiKey.NavGamepadActivate, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner)))
        local input_pressed_keyboard = nav_keyboard_active and (ImGui.IsKeyPressedEx(ImGuiKey.Enter, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner) or ImGui.IsKeyPressedEx(ImGuiKey.KeypadEnter, ImGuiInputFlags.None, ImGuiKeyOwner_NoOwner))
        local input_pressed_gamepad = false
        if activate_down and nav_gamepad_active and ImGui.IsKeyDown(ImGuiKey.NavGamepadActivate, ImGuiKeyOwner_NoOwner) and bit32.band(g.NavIdItemFlags, ImGuiItemFlags.Inputable) ~= 0 then
            if ImGui.GetKeyData(g, ImGuiKey.NavGamepadActivate).DownDurationPrev < NAV_ACTIVATE_INPUT_WITH_GAMEPAD_DELAY and ImGui.GetKeyData(g, ImGuiKey.NavGamepadActivate).DownDuration >= NAV_ACTIVATE_INPUT_WITH_GAMEPAD_DELAY then
                input_pressed_gamepad = true
            end
        end

        if g.ActiveId == 0 and activate_pressed then
            g.NavActivateId = g.NavId
            g.NavActivateFlags = ImGuiActivateFlags.PreferTweak
        end
        if (g.ActiveId == 0 or g.ActiveId == g.NavId) and (input_pressed_keyboard or input_pressed_gamepad) then
            g.NavActivateId = g.NavId
            g.NavActivateFlags = ImGuiActivateFlags.PreferInput
        end
        if (g.ActiveId == 0 or g.ActiveId == g.NavId) and (activate_down or input_pressed_keyboard or input_pressed_gamepad) then
            g.NavActivateDownId = g.NavId
        end
        if (g.ActiveId == 0 or g.ActiveId == g.NavId) and (activate_pressed or input_pressed_keyboard or input_pressed_gamepad) then
            g.NavActivatePressedId = g.NavId
            ImGui.NavHighlightActivated(g.NavId)
        end
    end
    if g.NavWindow and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.NoNavInputs) ~= 0 then
        g.NavCursorVisible = false
    elseif g.IO.ConfigNavCursorVisibleAlways and g.NavCursorHideFrames == 0 then
        g.NavCursorVisible = true
    end
    if g.NavActivateId ~= 0 then
        IM_ASSERT(g.NavActivateDownId == g.NavActivateId)
    end

    if g.NavHighlightActivatedTimer > 0.0 then
        g.NavHighlightActivatedTimer = ImMax(0.0, g.NavHighlightActivatedTimer - io.DeltaTime)
    end
    if g.NavHighlightActivatedTimer == 0.0 then
        g.NavHighlightActivatedId = 0
    end

    if g.NavNextActivateId ~= 0 then
        g.NavActivateId = g.NavNextActivateId
        g.NavActivateDownId = g.NavNextActivateId
        g.NavActivatePressedId = g.NavNextActivateId
        g.NavActivateFlags = g.NavNextActivateFlags
    end
    g.NavNextActivateId = 0

    ImGui.NavUpdateCreateMoveRequest()
    if g.NavMoveDir == ImGuiDir.None then
        ImGui.NavUpdateCreateTabbingRequest()
    end
    ImGui.NavUpdateAnyRequestFlag()
    g.NavIdIsAlive = false

    if g.NavWindow and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.NoNavInputs) == 0 and not g.NavWindowingTarget then
        local window = g.NavWindow
        local scroll_speed = IM_ROUND(window.FontRefSize * 100 * io.DeltaTime)
        local move_dir = g.NavMoveDir
        if window.DC.NavLayersActiveMask == 0x00 and window.DC.NavWindowHasScrollY and move_dir ~= ImGuiDir.None then
            if move_dir == ImGuiDir.Left or move_dir == ImGuiDir.Right then
                local delta = (move_dir == ImGuiDir.Left) and -1.0 or 1.0
                ImGui.SetScrollX(window, ImTrunc(window.Scroll.x + delta * scroll_speed))
            end
            if move_dir == ImGuiDir.Up or move_dir == ImGuiDir.Down then
                local delta = (move_dir == ImGuiDir.Up) and -1.0 or 1.0
                ImGui.SetScrollY(window, ImTrunc(window.Scroll.y + delta * scroll_speed))
            end
        end

        if nav_gamepad_active then
            local scroll_dir = ImGui.GetKeyMagnitude2d(ImGuiKey.GamepadLStickLeft, ImGuiKey.GamepadLStickRight, ImGuiKey.GamepadLStickUp, ImGuiKey.GamepadLStickDown)
            local tweak_factor = 1.0
            if ImGui.IsKeyDown(ImGuiKey.NavGamepadTweakSlow) then
                tweak_factor = 1.0 / 10.0
            elseif ImGui.IsKeyDown(ImGuiKey.NavGamepadTweakFast) then
                tweak_factor = 10.0
            end
            if scroll_dir.x ~= 0.0 and window.ScrollbarX then
                ImGui.SetScrollX(window, ImTrunc(window.Scroll.x + scroll_dir.x * scroll_speed * tweak_factor))
            end
            if scroll_dir.y ~= 0.0 then
                ImGui.SetScrollY(window, ImTrunc(window.Scroll.y + scroll_dir.y * scroll_speed * tweak_factor))
            end
        end
    end

    if not nav_keyboard_active and not nav_gamepad_active then
        g.NavCursorVisible = false
        g.NavHighlightItemUnderNav = false
        set_mouse_pos = false
    end

    if set_mouse_pos and io.ConfigNavMoveSetMousePos and bit32.band(io.BackendFlags, ImGuiBackendFlags.HasSetMousePos) ~= 0 then
        ImGui.TeleportMousePos(ImGui.NavCalcPreferredRefPos(ImGuiWindowFlags.Popup))
    end

    g.NavScoringDebugCount = 0
end

end

function ImGui.NavUpdateCancelRequest()
    local g = GImGui
    local nav_gamepad_active = bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.NavEnableGamepad) ~= 0 and bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.HasGamepad) ~= 0
    local nav_keyboard_active = bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) ~= 0
    if not (nav_keyboard_active and ImGui.IsKeyPressedEx(ImGuiKey.Escape, 0, ImGuiKeyOwner_NoOwner)) and not (nav_gamepad_active and ImGui.IsKeyPressedEx(ImGuiKey.NavGamepadCancel, 0, ImGuiKeyOwner_NoOwner)) then
        return
    end

    -- IMGUI_DEBUG_LOG_NAV("[nav] NavUpdateCancelRequest()")
    if g.ActiveId ~= 0 then
        ImGui.ClearActiveID()
    elseif g.NavLayer ~= ImGuiNavLayer.Main then
        ImGui.NavRestoreLayer(ImGuiNavLayer.Main)
        ImGui.SetNavCursorVisibleAfterMove()
    elseif g.NavWindow and g.NavWindow ~= g.NavWindow.RootWindow and bit32.band(g.NavWindow.RootWindowForNav.Flags, ImGuiWindowFlags.Popup) == 0 and g.NavWindow.RootWindowForNav.ParentWindow then
        local child_window = g.NavWindow.RootWindowForNav
        local parent_window = child_window.ParentWindow
        IM_ASSERT(child_window.ChildId ~= 0)
        ImGui.FocusWindow(parent_window)
        ImGui.SetNavID(child_window.ChildId, ImGuiNavLayer.Main, 0, ImGui.WindowRectAbsToRel(parent_window, child_window:Rect()))
        ImGui.SetNavCursorVisibleAfterMove()
    elseif g.OpenPopupStack.Size > 0 and g.OpenPopupStack:back().Window ~= nil and bit32.band(g.OpenPopupStack:back().Window.Flags, ImGuiWindowFlags.Modal) == 0 then
        ImGui.ClosePopupToLevel(g.OpenPopupStack.Size - 1, true)
    else
        if g.IO.ConfigNavEscapeClearFocusItem or g.IO.ConfigNavEscapeClearFocusWindow then
            if g.NavWindow and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.Popup) ~= 0 then
                g.NavWindow.NavLastIds[0] = 0
            end
        end
        if g.IO.ConfigNavEscapeClearFocusItem or g.IO.ConfigNavEscapeClearFocusWindow then
            g.NavId = 0
        end
        if g.IO.ConfigNavEscapeClearFocusWindow then
            ImGui.FocusWindow(nil)
        end
    end
end

function ImGui.NavMoveRequestButNoResultYet()
    local g = GImGui
    return g.NavMoveScoringItems and g.NavMoveResultLocal.ID == 0 and g.NavMoveResultOther.ID == 0
end

local function ImGetDirQuadrantFromDelta(dx, dy)
    if ImFabs(dx) > ImFabs(dy) then
        return (dx > 0.0) and ImGuiDir.Right or ImGuiDir.Left
    end
    return (dy > 0.0) and ImGuiDir.Down or ImGuiDir.Up
end

local function NavScoreItemDistInterval(cand_min, cand_max, curr_min, curr_max)
    if cand_max < curr_min then
        return cand_max - curr_min
    end
    if curr_max < cand_min then
        return cand_min - curr_max
    end
    return 0.0
end

--- @param result ImGuiNavItemData
--- @param nav_bb ImRect
--- @return bool
function ImGui.NavScoreItem(result, nav_bb)
    local g = GImGui
    local window = g.CurrentWindow
    if g.NavLayer ~= window.DC.NavLayerCurrent then
        return false
    end

    local cand = ImRect()
    ImRect_Copy(cand, nav_bb)
    local curr = g.NavScoringRect
    g.NavScoringDebugCount = g.NavScoringDebugCount + 1

    if window.ParentWindow == g.NavWindow then
        IM_ASSERT(bit32.band(bit32.bor(window.ChildFlags, g.NavWindow.ChildFlags), ImGuiChildFlags.NavFlattened) ~= 0)
        if not window.ClipRect:Overlaps(cand) then
            return false
        end
        cand:ClipWithFull(window.ClipRect)
    end

    local dbx = NavScoreItemDistInterval(cand.Min.x, cand.Max.x, curr.Min.x, curr.Max.x)
    local dby = NavScoreItemDistInterval(ImLerp(cand.Min.y, cand.Max.y, 0.2), ImLerp(cand.Min.y, cand.Max.y, 0.8), ImLerp(curr.Min.y, curr.Max.y, 0.2), ImLerp(curr.Min.y, curr.Max.y, 0.8))
    if dby ~= 0.0 and dbx ~= 0.0 then
        dbx = (dbx / 1000.0) + ((dbx > 0.0) and 1.0 or -1.0)
    end
    local dist_box = ImFabs(dbx) + ImFabs(dby)

    local dcx = (cand.Min.x + cand.Max.x) - (curr.Min.x + curr.Max.x)
    local dcy = (cand.Min.y + cand.Max.y) - (curr.Min.y + curr.Max.y)
    local dist_center = ImFabs(dcx) + ImFabs(dcy)

    local quadrant
    local dax = 0.0
    local day = 0.0
    local dist_axial = 0.0
    if dbx ~= 0.0 or dby ~= 0.0 then
        dax = dbx
        day = dby
        dist_axial = dist_box
        quadrant = ImGetDirQuadrantFromDelta(dbx, dby)
    elseif dcx ~= 0.0 or dcy ~= 0.0 then
        dax = dcx
        day = dcy
        dist_axial = dist_center
        quadrant = ImGetDirQuadrantFromDelta(dcx, dcy)
    else
        quadrant = (g.LastItemData.ID < g.NavId) and ImGuiDir.Left or ImGuiDir.Right
    end

    local move_dir = g.NavMoveDir

    local new_best = false
    if quadrant == move_dir then
        if dist_box < result.DistBox then
            result.DistBox = dist_box
            result.DistCenter = dist_center
            return true
        end
        if dist_box == result.DistBox then
            if dist_center < result.DistCenter then
                result.DistCenter = dist_center
                new_best = true
            elseif dist_center == result.DistCenter then
                if (((move_dir == ImGuiDir.Up or move_dir == ImGuiDir.Down) and dby) or dbx) < 0.0 then
                    new_best = true
                end
            end
        end
    end

    if result.DistBox == FLT_MAX and dist_axial < result.DistAxial then
        if g.NavLayer == ImGuiNavLayer.Menu and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.ChildMenu) == 0 then
            if (move_dir == ImGuiDir.Left and dax < 0.0) or (move_dir == ImGuiDir.Right and dax > 0.0) or (move_dir == ImGuiDir.Up and day < 0.0) or (move_dir == ImGuiDir.Down and day > 0.0) then
                result.DistAxial = dist_axial
                new_best = true
            end
        end
    end

    return new_best
end

--- @param result ImGuiNavItemData
function ImGui.NavApplyItemToResult(result)
    local g = GImGui
    local window = g.CurrentWindow
    result.Window = window
    result.ID = g.LastItemData.ID
    result.FocusScopeId = g.CurrentFocusScopeId
    result.ItemFlags = g.LastItemData.ItemFlags
    ImRect_Copy(result.RectRel, ImGui.WindowRectAbsToRel(window, g.LastItemData.NavRect))
    if bit32.band(result.ItemFlags, ImGuiItemFlags.HasSelectionUserData) ~= 0 then
        IM_ASSERT(g.NextItemData.SelectionUserData ~= ImGuiSelectionUserData_Invalid)
        result.SelectionUserData = g.NextItemData.SelectionUserData
    end
end

--- @param result ImGuiNavItemData
function ImGui.NavMoveRequestResolveWithLastItem(result)
    local g = GImGui
    g.NavMoveScoringItems = false
    ImGui.NavApplyItemToResult(result)
    ImGui.NavUpdateAnyRequestFlag()
end

--- @param id         ImGuiID
--- @param item_flags ImGuiItemFlags
--- @param move_flags ImGuiNavMoveFlags
function ImGui.NavProcessItemForTabbingRequest(id, item_flags, move_flags)
    local g = GImGui

    if bit32.band(move_flags, ImGuiNavMoveFlags.FocusApi) == 0 then
        if g.NavLayer ~= g.CurrentWindow.DC.NavLayerCurrent then
            return
        end
        if g.NavFocusScopeId ~= g.CurrentFocusScopeId then
            return
        end
    end

    local can_stop
    if bit32.band(move_flags, ImGuiNavMoveFlags.FocusApi) ~= 0 then
        can_stop = true
    else
        can_stop = bit32.band(item_flags, ImGuiItemFlags.NoTabStop) == 0 and (bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard) ~= 0 or bit32.band(item_flags, ImGuiItemFlags.Inputable) ~= 0)
    end

    local result = g.NavMoveResultLocal
    if g.NavTabbingDir == 1 then
        if can_stop and g.NavTabbingResultFirst.ID == 0 then
            ImGui.NavApplyItemToResult(g.NavTabbingResultFirst)
        end
        if can_stop and g.NavTabbingCounter > 0 then
            g.NavTabbingCounter = g.NavTabbingCounter - 1
            if g.NavTabbingCounter == 0 then
                ImGui.NavMoveRequestResolveWithLastItem(result)
            end
        elseif g.NavId == id then
            g.NavTabbingCounter = 1
        end
    elseif g.NavTabbingDir == -1 then
        if g.NavId == id then
            if result.ID ~= 0 then
                g.NavMoveScoringItems = false
                ImGui.NavUpdateAnyRequestFlag()
            end
        elseif can_stop then
            ImGui.NavApplyItemToResult(result)
        end
    elseif g.NavTabbingDir == 0 then
        if can_stop and g.NavId == id then
            ImGui.NavMoveRequestResolveWithLastItem(result)
        end
        if can_stop and g.NavTabbingResultFirst.ID == 0 then
            ImGui.NavApplyItemToResult(g.NavTabbingResultFirst)
        end
    end
end

function ImGui.NavProcessItem()
    local g = GImGui
    local window = g.CurrentWindow
    local id = g.LastItemData.ID
    local item_flags = g.LastItemData.ItemFlags

    local nav_bb = ImRect()
    ImRect_Copy(nav_bb, g.LastItemData.NavRect)
    if window.DC.NavIsScrollPushableX == false then
        nav_bb.Min.x = ImClamp(nav_bb.Min.x, window.ClipRect.Min.x, window.ClipRect.Max.x)
        nav_bb.Max.x = ImClamp(nav_bb.Max.x, window.ClipRect.Min.x, window.ClipRect.Max.x)
    end

    if g.NavInitRequest and g.NavLayer == window.DC.NavLayerCurrent and bit32.band(item_flags, ImGuiItemFlags.Disabled) == 0 then
        local candidate_for_nav_default_focus = bit32.band(item_flags, ImGuiItemFlags.NoNavDefaultFocus) == 0
        if candidate_for_nav_default_focus or g.NavInitResult.ID == 0 then
            ImGui.NavApplyItemToResult(g.NavInitResult)
        end
        if candidate_for_nav_default_focus then
            g.NavInitRequest = false
            ImGui.NavUpdateAnyRequestFlag()
        end
    end

    if g.NavMoveScoringItems and bit32.band(item_flags, ImGuiItemFlags.Disabled) == 0 then
        if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.FocusApi) ~= 0 or bit32.band(window.Flags, ImGuiWindowFlags.NoNavInputs) == 0 then
            local is_tabbing = bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsTabbing) ~= 0
            if is_tabbing then
                ImGui.NavProcessItemForTabbingRequest(id, item_flags, g.NavMoveFlags)
            elseif g.NavId ~= id or bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.AllowCurrentNavId) ~= 0 then
                local result = (window == g.NavWindow) and g.NavMoveResultLocal or g.NavMoveResultOther
                if ImGui.NavScoreItem(result, nav_bb) then
                    ImGui.NavApplyItemToResult(result)
                end

                local VISIBLE_RATIO = 0.70
                if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.AlsoScoreVisibleSet) ~= 0 then
                    local r = window.InnerRect
                    if r:Overlaps(nav_bb) then
                        if ImClamp(nav_bb.Max.y, r.Min.y, r.Max.y) - ImClamp(nav_bb.Min.y, r.Min.y, r.Max.y) >= (nav_bb.Max.y - nav_bb.Min.y) * VISIBLE_RATIO then
                            if ImGui.NavScoreItem(g.NavMoveResultLocalVisible, nav_bb) then
                                ImGui.NavApplyItemToResult(g.NavMoveResultLocalVisible)
                            end
                        end
                    end
                end
            end
        end
    end

    if g.NavId == id then
        if g.NavWindow ~= window then
            ImGui.SetNavWindow(window)
        end
        g.NavLayer = window.DC.NavLayerCurrent
        ImGui.SetNavFocusScope(g.CurrentFocusScopeId)
        g.NavFocusScopeId = g.CurrentFocusScopeId
        g.NavIdIsAlive = true
        g.NavIdItemFlags = item_flags
        if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.HasSelectionUserData) ~= 0 then
            IM_ASSERT(g.NextItemData.SelectionUserData ~= ImGuiSelectionUserData_Invalid)
            g.NavLastValidSelectionUserData = g.NextItemData.SelectionUserData
        end
        window.NavRectRel[window.DC.NavLayerCurrent] = ImGui.WindowRectAbsToRel(window, nav_bb)
    end
end

function ImGui.NavInitRequestApplyResult()
    local g = GImGui
    if not g.NavWindow then
        return
    end

    local result = g.NavInitResult
    if g.NavId ~= result.ID then
        g.NavJustMovedFromFocusScopeId = g.NavFocusScopeId
        g.NavJustMovedToId = result.ID
        g.NavJustMovedToFocusScopeId = result.FocusScopeId
        g.NavJustMovedToKeyMods = 0
        g.NavJustMovedToIsTabbing = false
        g.NavJustMovedToHasSelectionData = bit32.band(result.ItemFlags, ImGuiItemFlags.HasSelectionUserData) ~= 0
    end

    ImGui.SetNavID(result.ID, g.NavLayer, result.FocusScopeId, result.RectRel)
    g.NavIdIsAlive = true
    if result.SelectionUserData ~= ImGuiSelectionUserData_Invalid then
        g.NavLastValidSelectionUserData = result.SelectionUserData
    end
    if g.NavInitRequestFromMove then
        ImGui.SetNavCursorVisibleAfterMove()
    end
end

function ImGui.NavMoveRequestApplyResult()
    local g = GImGui

    local result
    if g.NavMoveResultLocal.ID ~= 0 then
        result = g.NavMoveResultLocal
    elseif g.NavMoveResultOther.ID ~= 0 then
        result = g.NavMoveResultOther
    else
        result = nil
    end

    if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsTabbing) ~= 0 and result == nil then
        if (g.NavTabbingCounter == 1 or g.NavTabbingDir == 0) and g.NavTabbingResultFirst.ID ~= 0 then
            result = g.NavTabbingResultFirst
        end
    end

    local axis = (g.NavMoveDir == ImGuiDir.Up or g.NavMoveDir == ImGuiDir.Down) and ImGuiAxis.Y or ImGuiAxis.X
    if result == nil then
        if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsTabbing) ~= 0 then
            g.NavMoveFlags = bit32.bor(g.NavMoveFlags, ImGuiNavMoveFlags.NoSetNavCursorVisible)
        end
        if g.NavId ~= 0 and bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.NoSetNavCursorVisible) == 0 then
            ImGui.SetNavCursorVisibleAfterMove()
        end
        ImGui.NavClearPreferredPosForAxis(axis)
        return
    end

    if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.AlsoScoreVisibleSet) ~= 0
        and g.NavMoveResultLocalVisible.ID ~= 0 and g.NavMoveResultLocalVisible.ID ~= g.NavId then
        result = g.NavMoveResultLocalVisible
    end

    if result ~= g.NavMoveResultOther and g.NavMoveResultOther.ID ~= 0 and g.NavMoveResultOther.Window.ParentWindow == g.NavWindow then
        if g.NavMoveResultOther.DistBox < result.DistBox
            or (g.NavMoveResultOther.DistBox == result.DistBox and g.NavMoveResultOther.DistCenter < result.DistCenter) then
            result = g.NavMoveResultOther
        end
    end
    IM_ASSERT(g.NavWindow and result.Window)

    if g.NavLayer == ImGuiNavLayer.Main then
        local rect_abs = ImGui.WindowRectRelToAbs(result.Window, result.RectRel)
        ImGui.ScrollToRectEx(result.Window, rect_abs, g.NavMoveScrollFlags)
        if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.ScrollToEdgeY) ~= 0 then
            local scroll_target = (g.NavMoveDir == ImGuiDir.Up) and result.Window.ScrollMax.y or 0.0
            ImGui.SetScrollY(result.Window, scroll_target)
        end
    end

    if g.NavWindow ~= result.Window then
        g.NavWindow = result.Window
        g.NavLastValidSelectionUserData = ImGuiSelectionUserData_Invalid
    end

    if g.ActiveId ~= result.ID and bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.NoClearActiveId) == 0 then
        ImGui.ClearActiveID()
    end

    if (g.NavId ~= result.ID or bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsPageMove) ~= 0)
        and bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.NoSelect) == 0 then
        g.NavJustMovedFromFocusScopeId = g.NavFocusScopeId
        g.NavJustMovedToId = result.ID
        g.NavJustMovedToFocusScopeId = result.FocusScopeId
        g.NavJustMovedToKeyMods = g.NavMoveKeyMods
        g.NavJustMovedToIsTabbing = bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsTabbing) ~= 0
        g.NavJustMovedToHasSelectionData = bit32.band(result.ItemFlags, ImGuiItemFlags.HasSelectionUserData) ~= 0
    end

    local root_for_nav = g.NavWindow.RootWindowForNav
    local preferred_scoring_pos_rel = ImVec2()
    ImVec2_Copy(preferred_scoring_pos_rel, root_for_nav.NavPreferredScoringPosRel[g.NavLayer])
    ImGui.SetNavID(result.ID, g.NavLayer, result.FocusScopeId, result.RectRel)
    if result.SelectionUserData ~= ImGuiSelectionUserData_Invalid then
        g.NavLastValidSelectionUserData = result.SelectionUserData
    end

    if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsTabbing) == 0 then
        preferred_scoring_pos_rel[axis] = result.RectRel:GetCenter()[axis]
        ImVec2_Copy(root_for_nav.NavPreferredScoringPosRel[g.NavLayer], preferred_scoring_pos_rel)
    end

    if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsTabbing) ~= 0
        and bit32.band(result.ItemFlags, ImGuiItemFlags.Inputable) == 0 then
        g.NavMoveFlags = bit32.band(g.NavMoveFlags, bit32.bnot(ImGuiNavMoveFlags.Activate))
    end

    if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.Activate) ~= 0 then
        g.NavNextActivateId = result.ID
        g.NavNextActivateFlags = ImGuiActivateFlags.None
        if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.FocusApi) ~= 0 then
            g.NavNextActivateFlags = bit32.bor(g.NavNextActivateFlags, ImGuiActivateFlags.FromFocusApi)
        end
        if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsTabbing) ~= 0 then
            g.NavNextActivateFlags = bit32.bor(g.NavNextActivateFlags, ImGuiActivateFlags.PreferInput, ImGuiActivateFlags.TryToPreserveState, ImGuiActivateFlags.FromTabbing)
        end
    end

    if bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.NoSetNavCursorVisible) == 0 then
        ImGui.SetNavCursorVisibleAfterMove()
    end
end

function ImGui.NavUpdateCurrentWindowIsScrollPushableX()
    local g = GImGui
    local window = g.CurrentWindow
    window.DC.NavIsScrollPushableX = (g.CurrentTable == nil and window.DC.CurrentColumns == nil)
end

--- @param result         ImGuiNavItemData
--- @param tree_node_data ImGuiTreeNodeStackData
function ImGui.NavMoveRequestResolveWithPastTreeNode(result, tree_node_data)
    local g = GImGui
    g.NavMoveScoringItems = false
    g.LastItemData.ID = tree_node_data.ID
    g.LastItemData.ItemFlags = bit32.band(tree_node_data.ItemFlags, bit32.bnot(ImGuiItemFlags.HasSelectionUserData))
    ImRect_Copy(g.LastItemData.NavRect, tree_node_data.NavRect)
    ImGui.NavApplyItemToResult(result)
    ImGui.NavClearPreferredPosForAxis(ImGuiAxis.Y)
    ImGui.NavUpdateAnyRequestFlag()
end

function ImGui.NavMoveRequestCancel()
    local g = GImGui
    g.NavMoveSubmitted = false
    g.NavMoveScoringItems = false
    ImGui.NavUpdateAnyRequestFlag()
end

--- @param move_dir     ImGuiDir
--- @param clip_dir     ImGuiDir
--- @param move_flags   ImGuiNavMoveFlags
--- @param scroll_flags ImGuiScrollFlags
function ImGui.NavMoveRequestForward(move_dir, clip_dir, move_flags, scroll_flags)
    local g = GImGui
    IM_ASSERT(g.NavMoveForwardToNextFrame == false)
    ImGui.NavMoveRequestCancel()
    g.NavMoveForwardToNextFrame = true
    g.NavMoveDir = move_dir
    g.NavMoveClipDir = clip_dir
    g.NavMoveFlags = bit32.bor(move_flags, ImGuiNavMoveFlags.Forwarded)
    g.NavMoveScrollFlags = scroll_flags
end

--- @param window     ImGuiWindow
--- @param wrap_flags ImGuiNavMoveFlags
function ImGui.NavMoveRequestTryWrapping(window, wrap_flags)
    local g = GImGui
    IM_ASSERT(bit32.band(wrap_flags, ImGuiNavMoveFlags.WrapMask_) ~= 0 and bit32.band(wrap_flags, bit32.bnot(ImGuiNavMoveFlags.WrapMask_)) == 0)

    if g.NavWindow == window and g.NavMoveScoringItems and g.NavLayer == window.DC.NavLayerCurrent then
        g.NavMoveFlags = bit32.bor(bit32.band(g.NavMoveFlags, bit32.bnot(ImGuiNavMoveFlags.WrapMask_)), wrap_flags)
    end
end

---------------------------------------------------------------------------------------
-- [SECTION] DRAG AND DROP
---------------------------------------------------------------------------------------

function ImGui.IsDragDropPayloadBeingAccepted()
    local g = GImGui
    return g.DragDropActive and g.DragDropAcceptIdPrev ~= 0
end

---------------------------------------------------------------------------------------
-- [SECTION] LOCALIZATION
---------------------------------------------------------------------------------------

--- @param entries ImGuiLocEntry[]
--- @param count   int
function ImGui.LocalizeRegisterEntries(entries, count)
    local g = GImGui
    for n = 1, count do
        g.LocalizationTable[entries[n].Key] = entries[n].Text
    end
end

---------------------------------------------------------------------------------------
-- [SECTION] VIEWPORTS, PLATFORM WINDOWS
---------------------------------------------------------------------------------------

function MT.ImGuiViewport:GetDebugName()
    local viewport = self
    return viewport.Window and viewport.Window.Name or "n/a"
end

function MT.ImGuiPlatformIO:ClearPlatformHandlers()
    self.Platform_GetClipboardTextFn = nil; self.Platform_SetClipboardTextFn = nil
    self.Platform_ClipboardUserData  = nil
    self.Platform_OpenInShellFn = nil; self.Platform_OpenInShellUserData = nil
    self.Platform_SetImeDataFn = nil; self.Platform_ImeUserData = nil
    self.Platform_CreateWindow = nil; self.Platform_DestroyWindow = nil; self.Platform_ShowWindow = nil
    self.Platform_SetWindowPos   = nil; self.Platform_SetWindowSize  = nil
    self.Platform_GetWindowPos   = nil; self.Platform_GetWindowSize  = nil; self.Platform_GetWindowFramebufferScale = nil
    self.Platform_SetWindowFocus = nil; self.Platform_GetWindowFocus = nil; self.Platform_GetWindowMinimized        = nil
    self.Platform_SetWindowTitle = nil; self.Platform_SetWindowAlpha = nil; self.Platform_UpdateWindow              = nil
    self.Platform_RenderWindow   = nil; self.Platform_SwapBuffers    = nil; self.Platform_GetWindowDpiScale         = nil
    self.Platform_OnChangedViewport = nil; self.Platform_GetWindowWorkAreaInsets = nil; self.Platform_CreateVkSurface = nil
end

function MT.ImGuiPlatformIO:ClearRendererHandlers()
    self.Renderer_TextureMaxWidth = 0; self.Renderer_TextureMaxHeight = 0
    self.Renderer_RenderState     = nil
    self.Renderer_CreateWindow    = nil; self.Renderer_DestroyWindow  = nil
    self.Renderer_SetWindowSize   = nil
    self.Renderer_RenderWindow    = nil; self.Renderer_SwapBuffers    = nil
end

--- @return ImGuiViewport
function ImGui.GetMainViewport()
    local g = GImGui

    return g.Viewports[1]
end

--- @param viewport_id ImGuiID
--- @return ImGuiViewport?
function ImGui.FindViewportByID(viewport_id)
    local g = GImGui
    for _, viewport in g.Viewports:iter() do
        if viewport.ID == viewport_id then
            return viewport
        end
    end
    return nil
end

--- @param current_window? ImGuiWindow
--- @param viewport?       ImGuiViewportP
function ImGui.SetCurrentViewport(current_window, viewport)
    local g = GImGui

    if viewport then
        viewport.LastFrameActive = g.FrameCount
    end
    if g.CurrentViewport == viewport then
        return
    end

    g.CurrentDpiScale = viewport and viewport.DpiScale or 1.0
    g.CurrentViewport = viewport
    IM_ASSERT(g.CurrentDpiScale > 0.0 and g.CurrentDpiScale < 99.0)  -- Typical correct values would be between 1.0f and 4.0f
    -- IMGUI_DEBUG_LOG_VIEWPORT("[viewport] SetCurrentViewport changed '%s' 0x%08X", current_window and current_window.Name or "NULL", viewport and viewport.ID or 0)

    if g.IO.ConfigDpiScaleFonts then
        g.Style.FontScaleDpi = g.CurrentDpiScale
    end

    -- Notify platform layer of viewport changes
    -- FIXME-DPI: This is only currently used for experimenting with handling of multiple DPI
    if g.CurrentViewport and g.PlatformIO.Platform_OnChangedViewport then
        g.PlatformIO.Platform_OnChangedViewport(g.CurrentViewport)
    end
end

--- @param window   ImGuiWindow
--- @param viewport ImGuiViewportP
function ImGui.SetWindowViewport(window, viewport)
    -- Abandon viewport
    if window.ViewportOwned and window.Viewport.Window == window then
        window.Viewport.Size = ImVec2(0.0, 0.0)
    end

    window.Viewport = viewport
    window.ViewportId = viewport.ID
    window.ViewportOwned = (viewport.Window == window)
end

--- @param window ImGuiWindow
--- @return bool
function ImGui.GetWindowAlwaysWantOwnViewport(window)
    -- Tooltips and menus are not automatically forced into their own viewport when the NoMerge flag is set, however the multiplication of viewports makes them more likely to protrude and create their own.
    local g = GImGui
    if g.IO.ConfigViewportsNoAutoMerge or (bit32.band(window.WindowClass.ViewportFlagsOverrideSet, ImGuiViewportFlags.NoAutoMerge) ~= 0) then
        if bit32.band(g.ConfigFlagsCurrFrame, ImGuiConfigFlags.ViewportsEnable) ~= 0 then
            if not window.DockIsActive then
                if bit32.band(window.Flags, bit32.bor(ImGuiWindowFlags.ChildWindow, ImGuiWindowFlags.ChildMenu, ImGuiWindowFlags.Tooltip)) == 0 then
                    if bit32.band(window.Flags, ImGuiWindowFlags.Popup) == 0 or bit32.band(window.Flags, ImGuiWindowFlags.Modal) ~= 0 then
                        return true
                    end
                end
            end
        end
    end
    return false
end

--- Heuristic, see #8948: depends on how backends handle OS-level parenting.
--- Due to how parent viewport stack is layed out, note that IsViewportAbove(a,b) isn't always the same as !IsViewportAbove(b,a).
--- @param potential_above ImGuiViewportP
--- @param potential_below ImGuiViewportP
--- @return bool
function ImGui.IsViewportAbove(potential_above, potential_below)
    -- If ImGuiBackendFlags.HasParentViewport if set, ->ParentViewport chain should be accurate.
    local g = GImGui
    if bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.HasParentViewport) ~= 0 then
        local v = potential_above --[[@as ImGuiViewport]]
        while v ~= nil and v.ParentViewport do
            if v.ParentViewport == potential_below then
                return true
            end
            v = v.ParentViewport
        end
    else
        if potential_above.ParentViewport == potential_below then
            return true
        end
    end

    if potential_above.LastFocusedStampCount > potential_below.LastFocusedStampCount then
        return true
    end
    return false
end

--- @param window       ImGuiWindow
--- @param viewport_dst ImGuiViewportP
function ImGui.UpdateTryMergeWindowIntoHostViewport(window, viewport_dst)
    local g = GImGui
    IM_ASSERT(window == window.RootWindowDockTree)

    local viewport_src = window.Viewport -- Current viewport
    if viewport_src == viewport_dst then
        return false
    end
    if bit32.band(viewport_dst.Flags, ImGuiViewportFlags.CanHostOtherWindows) == 0 then
        return false
    end
    if bit32.band(viewport_dst.Flags, ImGuiViewportFlags.IsMinimized) ~= 0 then
        return false
    end
    if not viewport_dst:GetMainRect():Contains(window:Rect()) then
        return false
    end
    if ImGui.GetWindowAlwaysWantOwnViewport(window) then
        return false
    end

    for _, viewport_obstructing in g.Viewports:iter() do
        repeat
        if viewport_obstructing == viewport_src or viewport_obstructing == viewport_dst or not viewport_obstructing.PlatformWindowCreated then
            break
        end

        if viewport_obstructing:GetMainRect():Overlaps(window:Rect()) then
            if ImGui.IsViewportAbove(viewport_obstructing, viewport_dst) then
                if viewport_src == nil or ImGui.IsViewportAbove(viewport_src, viewport_obstructing) then
                    return false  -- viewport_obstructing is between viewport_src and viewport_dst -> Cannot merge.
                end
            end
        end

        until true
    end

    -- Move to the existing viewport, Move child/hosted windows as well (FIXME-OPT: iterate child)
    IMGUI_DEBUG_LOG_VIEWPORT("[viewport] Window '%s' merge into Viewport 0X%08X", window.Name, viewport_dst.ID)
    if window.ViewportOwned then
        for n = 1, g.Windows.Size do
            if g.Windows.Data[n].Viewport == viewport_src then
                ImGui.SetWindowViewport(g.Windows.Data[n], viewport_dst)
            end
        end
    end

    ImGui.SetWindowViewport(window, viewport_dst)

    if bit32.band(window.Flags, ImGuiWindowFlags.NoBringToFrontOnFocus) == 0 then
        ImGui.BringWindowToDisplayFront(window)
    end

    return true
end

-- FIXME: handle 0 to N host viewports
--- @param window ImGuiWindow
--- @return bool
function ImGui.UpdateTryMergeWindowIntoHostViewports(window)
    local g = GImGui
    return ImGui.UpdateTryMergeWindowIntoHostViewport(window, g.Viewports.Data[1])
end

--- Translate Dear ImGui windows when a Host Viewport has been moved
--- (This additionally keeps windows at the same place when ImGuiConfigFlags.ViewportsEnable is toggled!)
--- @param viewport ImGuiViewportP
--- @param old_pos  ImVec2
--- @param new_pos  ImVec2
--- @param old_size ImVec2
--- @param new_size ImVec2
function ImGui.TranslateWindowsInViewport(viewport, old_pos, new_pos, old_size, new_size)
    local g = GImGui
    -- IMGUI_DEBUG_LOG_VIEWPORT("[viewport] TranslateWindowsInViewport 0x%08X", viewport.ID)
    IM_ASSERT(viewport.Window == nil and (bit32.band(viewport.Flags, ImGuiViewportFlags.CanHostOtherWindows) ~= 0))

    -- 1) We test if ImGuiConfigFlags.ViewportsEnable was just toggled, which allows us to conveniently
    -- translate imgui windows from OS-window-local to absolute coordinates or vice-versa.
    -- 2) If it's not going to fit into the new size, keep it at same absolute position.
    -- One problem with this is that most Win32 applications doesn't update their render while dragging,
    -- and so the window will appear to teleport when releasing the mouse.
    local translate_all_windows = (bit32.band(g.ConfigFlagsCurrFrame, ImGuiConfigFlags.ViewportsEnable) ~= bit32.band(g.ConfigFlagsLastFrame, ImGuiConfigFlags.ViewportsEnable))
    local test_still_fit_rect = ImRect(old_pos, old_pos + old_size)
    local delta_pos = new_pos - old_pos

    for _, window in g.Windows:iter() do  -- FIXME-OPT
        if translate_all_windows or (window.Viewport == viewport and (old_size == new_size or test_still_fit_rect:Contains(window:Rect()))) then
            ImGui.TranslateWindow(window, delta_pos)
        end
    end
end

-- If the backend doesn't support ImGuiBackendFlags_HasMouseHoveredViewport or doesn't honor ImGuiViewportFlags_NoInputs for it, we do a search ourselves.
-- A) It won't take account of the possibility that non-imgui windows may be in-between our dragged window and our target window.
-- B) It requires Platform_GetWindowFocus to be implemented by backend.
--- @param mouse_platform_pos ImVec2
--- @return ImGuiViewportP?
function ImGui.FindHoveredViewportFromPlatformWindowStack(mouse_platform_pos)
    local g = GImGui
    local best_candidate = nil
    for _, viewport in g.Viewports:iter() do
        if bit32.band(viewport.Flags, bit32.bor(ImGuiViewportFlags.NoInputs, ImGuiViewportFlags.IsMinimized)) == 0 and viewport:GetMainRect():Contains(mouse_platform_pos) then
            if best_candidate == nil or best_candidate.LastFocusedStampCount < viewport.LastFocusedStampCount then
                if viewport.PlatformWindowCreated then
                    best_candidate = viewport
                end
            end
        end
    end
    return best_candidate
end

function ImGui.UpdateViewportsNewFrame()
    local g = GImGui
    IM_ASSERT(g.PlatformIO.Viewports.Size <= g.Viewports.Size)

    -- Update Minimized status (we need it first in order to decide if we'll apply Pos/Size of the main viewport)
    -- Update Focused status
    local viewports_enabled = (bit32.band(g.ConfigFlagsCurrFrame, ImGuiConfigFlags.ViewportsEnable) ~= 0)
    if viewports_enabled then
        local focused_viewport = nil

        for i = 1, g.Viewports.Size do
            local viewport = g.Viewports.Data[i]
            local platform_funcs_available = viewport.PlatformWindowCreated

            if g.PlatformIO.Platform_GetWindowMinimized and platform_funcs_available then
                local is_minimized = g.PlatformIO.Platform_GetWindowMinimized(viewport)
                if is_minimized then
                    viewport.Flags = bit32.bor(viewport.Flags, ImGuiViewportFlags.IsMinimized)
                else
                    viewport.Flags = bit32.band(viewport.Flags, bit32.bnot(ImGuiViewportFlags.IsMinimized))
                end
            end

            -- Update our implicit z-order knowledge of platform windows, which is used when the backend cannot provide io.MouseHoveredViewport.
            -- When setting Platform_GetWindowFocus, it is expected that the platform backend can handle calls without crashing if it doesn't have data stored.
            if g.PlatformIO.Platform_GetWindowFocus and platform_funcs_available then
                local is_focused = g.PlatformIO.Platform_GetWindowFocus(viewport)
                if is_focused then
                    viewport.Flags = bit32.bor(viewport.Flags, ImGuiViewportFlags.IsFocused)
                else
                    viewport.Flags = bit32.band(viewport.Flags, bit32.bnot(ImGuiViewportFlags.IsFocused))
                end
                if is_focused then
                    focused_viewport = viewport
                end
            end
        end

        -- Focused viewport has changed?
        if focused_viewport and g.PlatformLastFocusedViewportId ~= focused_viewport.ID then
            IMGUI_DEBUG_LOG_VIEWPORT("[viewport] Focused viewport changed %08X -> %08X '%s', attempting to apply our focus.", g.PlatformLastFocusedViewportId, focused_viewport.ID, focused_viewport.Window and focused_viewport.Window.Name or "n/a")
            local prev_focused_viewport = ImGui.FindViewportByID(g.PlatformLastFocusedViewportId)
            local prev_focused_has_been_destroyed = (prev_focused_viewport == nil) or (not prev_focused_viewport.PlatformWindowCreated)

            -- Store a tag so we can infer z-order easily from all our windows
            -- We compare PlatformLastFocusedViewportId so newly created viewports with _NoFocusOnAppearing flag
            -- will keep the front most stamp instead of losing it back to their parent viewport.
            if focused_viewport.LastFocusedStampCount ~= g.ViewportFocusedStampCount then
                g.ViewportFocusedStampCount = g.ViewportFocusedStampCount + 1
                focused_viewport.LastFocusedStampCount = g.ViewportFocusedStampCount
            end
            g.PlatformLastFocusedViewportId = focused_viewport.ID

            -- Focus associated dear imgui window
            -- - if focus didn't happen with a click within imgui boundaries, e.g. Clicking platform title bar. (#6299)
            -- - if focus didn't happen because we destroyed another window (#6462)
            -- FIXME: perhaps 'FocusTopMostWindowUnderOne()' can handle the 'focused_window.Window ~= nil' case as well.
            local apply_imgui_focus_on_focused_viewport = not ImGui.IsAnyMouseDown() and not prev_focused_has_been_destroyed
            if apply_imgui_focus_on_focused_viewport and g.IO.ConfigViewportsPlatformFocusSetsImGuiFocus then
                focused_viewport.LastFocusedHadNavWindow = focused_viewport.LastFocusedHadNavWindow or (g.NavWindow ~= nil and g.NavWindow.Viewport == focused_viewport)  -- Update so a window changing viewport won't lose focus.

                local focus_request_flags = bit32.bor(ImGuiFocusRequestFlags.UnlessBelowModal, ImGuiFocusRequestFlags.RestoreFocusedChild)
                if focused_viewport.Window ~= nil then
                    ImGui.FocusWindow(focused_viewport.Window, focus_request_flags)
                elseif focused_viewport.LastFocusedHadNavWindow then
                    ImGui.FocusTopMostWindowUnderOne(nil, nil, focused_viewport, focus_request_flags)  -- Focus top most in viewport
                else
                    ImGui.FocusWindow(nil, focus_request_flags)  -- No window had focus last time viewport was focused
                end
            end
        end

        if focused_viewport then
            focused_viewport.LastFocusedHadNavWindow = (g.NavWindow ~= nil) and (g.NavWindow.Viewport == focused_viewport)
        end
    end

    -- Create/update main viewport with current platform position.
    -- FIXME-VIEWPORT: Size is driven by backend/user code for backward-compatibility but we should aim to make this more consistent.
    local main_viewport = g.Viewports.Data[1]
    IM_ASSERT(main_viewport.ID == IMGUI_VIEWPORT_DEFAULT_ID)
    IM_ASSERT(main_viewport.Window == nil)

    local main_viewport_pos
    if viewports_enabled then
        main_viewport_pos = g.PlatformIO.Platform_GetWindowPos(main_viewport)
    else
        main_viewport_pos = ImVec2(0.0, 0.0)
    end
    local main_viewport_size = g.IO.DisplaySize
    local main_viewport_framebuffer_scale = g.IO.DisplayFramebufferScale

    if viewports_enabled and (bit32.band(main_viewport.Flags, ImGuiViewportFlags.IsMinimized) ~= 0) then
        ImVec2_Copy(main_viewport_pos, main_viewport.Pos) -- Preserve last pos/size when minimized (FIXME: We don't do the same for Size outside of the viewport path)
        ImVec2_Copy(main_viewport_size, main_viewport.Size)
        main_viewport_framebuffer_scale = main_viewport.FramebufferScale
    end

    ImGui.AddUpdateViewport(nil, IMGUI_VIEWPORT_DEFAULT_ID, main_viewport_pos, main_viewport_size, bit32.bor(ImGuiViewportFlags.OwnedByApp, ImGuiViewportFlags.CanHostOtherWindows))

    local memory_compact_start_time = (g.GcCompactAll or g.IO.ConfigMemoryCompactTimer < 0.0) and FLT_MAX or (g.Time - g.IO.ConfigMemoryCompactTimer)

    g.CurrentDpiScale = 0.0
    g.CurrentViewport = nil
    g.MouseViewport = nil

    local n = 1
    while n <= g.Viewports.Size do
        local viewport = g.Viewports.Data[n]
        viewport.Idx = n

        -- Erase unused viewports
        if n > 1 and viewport.LastFrameActive < g.FrameCount - 2 then
            ImGui.DestroyViewport(viewport)
            -- n stays the same because we removed an element
        else
            local platform_funcs_available = viewport.PlatformWindowCreated

            if viewports_enabled then
                -- Update Position and Size (from Platform Window to ImGui) if requested.
                -- We do it early in the frame instead of waiting for UpdatePlatformWindows() to avoid a frame of lag when moving/resizing using OS facilities.
                if (bit32.band(viewport.Flags, ImGuiViewportFlags.IsMinimized) == 0) and platform_funcs_available then
                    -- Viewport->WorkPos and WorkSize will be updated below
                    if viewport.PlatformRequestMove then
                        ImVec2_Copy(viewport.Pos, g.PlatformIO.Platform_GetWindowPos(viewport))
                        ImVec2_Copy(viewport.LastPlatformPos, viewport.Pos)
                    end
                    if viewport.PlatformRequestResize then
                        viewport.Size = g.PlatformIO.Platform_GetWindowSize(viewport)
                        ImVec2_Copy(viewport.LastPlatformSize, viewport.Size)
                    end
                    if g.PlatformIO.Platform_GetWindowFramebufferScale ~= nil then
                        viewport.FramebufferScale = g.PlatformIO.Platform_GetWindowFramebufferScale(viewport)
                    end
                end
            end

            -- Update/copy monitor info
            ImGui.UpdateViewportPlatformMonitor(viewport)

            -- Lock down space taken by menu bars and status bars + query initial insets from backend
            -- Setup initial value for functions like BeginMainMenuBar(), DockSpaceOverViewport() etc.
            viewport.WorkInsetMin = viewport.BuildWorkInsetMin
            viewport.WorkInsetMax = viewport.BuildWorkInsetMax
            viewport.BuildWorkInsetMin = ImVec2(0.0, 0.0)
            viewport.BuildWorkInsetMax = ImVec2(0.0, 0.0)

            if g.PlatformIO.Platform_GetWindowWorkAreaInsets ~= nil and platform_funcs_available then
                local insets = g.PlatformIO.Platform_GetWindowWorkAreaInsets(viewport)
                IM_ASSERT(insets.x >= 0.0 and insets.y >= 0.0 and insets.z >= 0.0 and insets.w >= 0.0)
                viewport.BuildWorkInsetMin = ImVec2(insets.x, insets.y)
                viewport.BuildWorkInsetMax = ImVec2(insets.z, insets.w)
            end

            viewport:UpdateWorkRect()

            for dl_n = 1, 2 do -- IM_COUNTOF(viewport->BgFgDrawLists)
                if viewport.BgFgDrawListsLastTimeActive[dl_n] < memory_compact_start_time and viewport.BgFgDrawLists[dl_n] ~= nil then
                    IM_DELETE(viewport.BgFgDrawLists, dl_n)
                end
            end

            -- Reset alpha every frame. Users of transparency (docking) needs to request a lower alpha back.
            viewport.Alpha = 1.0

            -- Translate Dear ImGui windows when a Host Viewport has been moved
            -- (This additionally keeps windows at the same place when ImGuiConfigFlags.ViewportsEnable is toggled!)
            local viewport_delta_pos = viewport.Pos - viewport.LastPos
            if (bit32.band(viewport.Flags, ImGuiViewportFlags.CanHostOtherWindows) ~= 0) and (viewport_delta_pos.x ~= 0.0 or viewport_delta_pos.y ~= 0.0) then
                ImGui.TranslateWindowsInViewport(viewport, viewport.LastPos, viewport.Pos, viewport.LastSize, viewport.Size)
            end

            -- Update DPI scale
            local new_dpi_scale
            if g.PlatformIO.Platform_GetWindowDpiScale and platform_funcs_available then
                new_dpi_scale = g.PlatformIO.Platform_GetWindowDpiScale(viewport)
            elseif viewport.PlatformMonitor ~= -1 then
                new_dpi_scale = g.PlatformIO.Monitors.Data[viewport.PlatformMonitor].DpiScale
            else
                new_dpi_scale = (viewport.DpiScale ~= 0.0) and viewport.DpiScale or 1.0
            end

            IM_ASSERT(new_dpi_scale > 0.0 and new_dpi_scale < 99.0)  -- Typical correct values would be between 1.0f and 4.0f

            if viewport.DpiScale ~= 0.0 and new_dpi_scale ~= viewport.DpiScale then
                local scale_factor = new_dpi_scale / viewport.DpiScale
                if g.IO.ConfigDpiScaleViewports then
                    ImGui.ScaleWindowsInViewport(viewport, scale_factor)
                end
                -- if viewport == ImGui.GetMainViewport() then
                --     g.PlatformInterface.SetWindowSize(viewport, viewport.Size * scale_factor)
                -- end

                -- Scale our window moving pivot so that the window will rescale roughly around the mouse position.
                -- FIXME-VIEWPORT: This currently creates a resizing feedback loop when a window is straddling a DPI transition border.
                -- (Minor: since our sizes do not perfectly linearly scale, deferring the click offset scale until we know the actual window scale ratio may get us slightly more precise mouse positioning.)
                -- if g.MovingWindow ~= nil and g.MovingWindow.Viewport == viewport then
                --     g.ActiveIdClickOffset = ImTrunc(g.ActiveIdClickOffset * scale_factor)
                -- end
            end

            viewport.DpiScale = new_dpi_scale
            n = n + 1
        end
    end

    -- Update fallback monitor
    g.PlatformMonitorsFullWorkRect = ImRect(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX)

    if g.PlatformIO.Monitors.Size == 0 then
        local monitor = g.FallbackMonitor
        ImVec2_Copy(monitor.MainPos, main_viewport.Pos)
        ImVec2_Copy(monitor.MainSize, main_viewport.Size)
        ImVec2_Copy(monitor.WorkPos, main_viewport.WorkPos)
        ImVec2_Copy(monitor.WorkSize, main_viewport.WorkSize)
        monitor.DpiScale = main_viewport.DpiScale

        g.PlatformMonitorsFullWorkRect:Add(monitor.WorkPos)
        g.PlatformMonitorsFullWorkRect:Add(monitor.WorkPos + monitor.WorkSize)
    else
        g.FallbackMonitor = g.PlatformIO.Monitors.Data[1]
    end

    for i = 1, g.PlatformIO.Monitors.Size do
        local monitor = g.PlatformIO.Monitors.Data[i]
        g.PlatformMonitorsFullWorkRect:Add(monitor.WorkPos)
        g.PlatformMonitorsFullWorkRect:Add(monitor.WorkPos + monitor.WorkSize)
    end

    if not viewports_enabled then
        g.MouseViewport = main_viewport
        return
    end

    -- Mouse handling: decide on the actual mouse viewport for this frame between the active/focused viewport and the hovered viewport.
    -- Note that 'viewport_hovered' should skip over any viewport that has the ImGuiViewportFlags.NoInputs flags set.
    local viewport_hovered = nil

    if bit32.band(g.IO.BackendFlags, ImGuiBackendFlags.HasMouseHoveredViewport) ~= 0 then
        viewport_hovered = g.IO.MouseHoveredViewport and ImGui.FindViewportByID(g.IO.MouseHoveredViewport) or nil
        if viewport_hovered and (bit32.band(viewport_hovered.Flags, ImGuiViewportFlags.NoInputs) ~= 0) then
            viewport_hovered = ImGui.FindHoveredViewportFromPlatformWindowStack(g.IO.MousePos)  -- Backend failed to handle _NoInputs viewport: revert to our fallback.
        end
    else
        -- If the backend doesn't know how to honor ImGuiViewportFlags.NoInputs, we do a search ourselves. Note that this search:
        -- A) won't take account of the possibility that non-imgui windows may be in-between our dragged window and our target window.
        -- B) won't take account of how the backend apply parent<>child relationship to secondary viewports, which affects their Z order.
        -- C) uses LastFocusedStampCount as a flawed replacement for the last time a window was focused (we could/should fix that by introducing Focus functions in PlatformIO)
        viewport_hovered = ImGui.FindHoveredViewportFromPlatformWindowStack(g.IO.MousePos)
    end

    if viewport_hovered ~= nil then
        g.MouseLastHoveredViewport = viewport_hovered
    elseif g.MouseLastHoveredViewport == nil then
        g.MouseLastHoveredViewport = g.Viewports.Data[1]
    end

    -- Update mouse reference viewport
    -- (when moving a window we aim at its viewport, but this will be overwritten below if we go in drag and drop mode)
    -- (MovingViewport->Viewport will be nil in the rare situation where the window disappared while moving, set UpdateMouseMovingWindowNewFrame() for details)
    if g.MovingWindow and g.MovingWindow.Viewport then
        g.MouseViewport = g.MovingWindow.Viewport
    else
        g.MouseViewport = g.MouseLastHoveredViewport
    end

    -- When dragging something, always refer to the last hovered viewport.
    -- - when releasing a moving window we will revert to aiming behind (at viewport_hovered)
    -- - when we are between viewports, our dragged preview will tend to show in the last viewport _even_ if we don't have tooltips in their viewports (when lacking monitor info)
    -- - consider the case of holding on a menu item to browse child menus: even thou a mouse button is held, there's no active id because menu items only react on mouse release.
    -- FIXME-VIEWPORT: This is essentially broken, when ImGuiBackendFlags.HasMouseHoveredViewport is set we want to trust when viewport_hovered==nil and use that.
    local is_mouse_dragging_with_an_expected_destination = g.DragDropActive
    if is_mouse_dragging_with_an_expected_destination and viewport_hovered == nil then
        viewport_hovered = g.MouseLastHoveredViewport
    end

    if is_mouse_dragging_with_an_expected_destination or g.ActiveId == 0 or not ImGui.IsAnyMouseDown() then
        if viewport_hovered ~= nil and viewport_hovered ~= g.MouseViewport and (bit32.band(viewport_hovered.Flags, ImGuiViewportFlags.NoInputs) == 0) then
            g.MouseViewport = viewport_hovered
        end
    end

    IM_ASSERT(g.MouseViewport ~= nil)
end

function ImGui.UpdateViewportsEndFrame()
    local g = GImGui
    g.PlatformIO.Viewports:resize(0)

    for i = 1, g.Viewports.Size do
        repeat
        local viewport = g.Viewports.Data[i]
        ImVec2_Copy(viewport.LastPos, ImVec2(viewport.Pos.x, viewport.Pos.y))
        ImVec2_Copy(viewport.LastSize, ImVec2(viewport.Size.x, viewport.Size.y))

        if (viewport.LastFrameActive < g.FrameCount or viewport.Size.x <= 0.0 or viewport.Size.y <= 0.0) and (i > 1) then
            break
        end
        if viewport.Window and not ImGui.IsWindowActiveAndVisible(viewport.Window) then
            break
        end
        if i > 1 then
            IM_ASSERT(viewport.Window ~= nil)
        end
        g.PlatformIO.Viewports:push_back(viewport)

        until true
    end

    g.Viewports.Data[1]:ClearRequestFlags()  -- Clear main viewport flags because UpdatePlatformWindows() won't do it and may not even be called
end

--- @param window? ImGuiWindow
--- @param id      ImGuiID
--- @param pos     ImVec2
--- @param size    ImVec2
--- @param flags   ImGuiViewportFlags
--- @return ImGuiViewportP
function ImGui.AddUpdateViewport(window, id, pos, size, flags)
    local g = GImGui
    IM_ASSERT(id ~= 0)

    flags = bit32.bor(flags, ImGuiViewportFlags.IsPlatformWindow)
    if window ~= nil then
        local window_can_use_inputs = (bit32.band(window.Flags, bit32.bor(ImGuiWindowFlags.NoMouseInputs, ImGuiWindowFlags.NoNavInputs)) == 0)
        if g.MovingWindow and g.MovingWindow.RootWindowDockTree == window then
            flags = bit32.bor(flags, ImGuiViewportFlags.NoInputs, ImGuiViewportFlags.NoFocusOnAppearing)
        end
        if not window_can_use_inputs then
            flags = bit32.bor(flags, ImGuiViewportFlags.NoInputs)
        end
        if bit32.band(window.Flags, ImGuiWindowFlags.NoFocusOnAppearing) ~= 0 then
            flags = bit32.bor(flags, ImGuiViewportFlags.NoFocusOnAppearing)
        end
    end

    local viewport = ImGui.FindViewportByID(id)
    if viewport then
        --- @cast viewport ImGuiViewportP

        -- Always update for main viewport as we are already pulling correct platform pos/size (see #4900)
        local prev_pos = ImVec2(viewport.Pos.x, viewport.Pos.y)
        local prev_size = ImVec2(viewport.Size.x, viewport.Size.y)
        if not viewport.PlatformRequestMove or viewport.ID == IMGUI_VIEWPORT_DEFAULT_ID then
            ImVec2_Copy(viewport.Pos, pos)
        end
        if not viewport.PlatformRequestResize or viewport.ID == IMGUI_VIEWPORT_DEFAULT_ID then
            ImVec2_Copy(viewport.Size, size)
        end
        -- Preserve existing flags
        viewport.Flags = bit32.bor(flags, bit32.band(viewport.Flags, bit32.bor(ImGuiViewportFlags.IsMinimized, ImGuiViewportFlags.IsFocused)))
        if prev_pos.x ~= viewport.Pos.x or prev_pos.y ~= viewport.Pos.y or prev_size.x ~= viewport.Size.x or prev_size.y ~= viewport.Size.y then
            ImGui.UpdateViewportPlatformMonitor(viewport)
        end
    else
        -- New viewport
        viewport = ImGuiViewportP()
        viewport.ID = id
        viewport.Idx = g.Viewports.Size
        ImVec2_Copy(viewport.Pos, pos)
        ImVec2_Copy(viewport.LastPos, pos)
        ImVec2_Copy(viewport.Size, size)
        ImVec2_Copy(viewport.LastSize, size)
        viewport.Flags = flags
        ImGui.UpdateViewportPlatformMonitor(viewport)
        g.Viewports:push_back(viewport)
        g.ViewportCreatedCount = g.ViewportCreatedCount + 1
        IMGUI_DEBUG_LOG_VIEWPORT("[viewport] Add Viewport %08X '%s'", id, window and window.Name or "<NULL>")

        -- We assume the window becomes front-most (even when ImGuiViewportFlags.NoFocusOnAppearing is used).
        -- This is useful for our platform z-order heuristic when io.MouseHoveredViewport is not available.
        g.ViewportFocusedStampCount = g.ViewportFocusedStampCount + 1
        viewport.LastFocusedStampCount = g.ViewportFocusedStampCount

        -- We normally setup for all viewports in NewFrame() but here need to handle the mid-frame creation of a new viewport.
        -- We need to extend the fullscreen clip rect so the OverlayDrawList clip is correct for that the first frame
        g.DrawListSharedData.ClipRectFullscreen.x = ImMin(g.DrawListSharedData.ClipRectFullscreen.x, viewport.Pos.x)
        g.DrawListSharedData.ClipRectFullscreen.y = ImMin(g.DrawListSharedData.ClipRectFullscreen.y, viewport.Pos.y)
        g.DrawListSharedData.ClipRectFullscreen.z = ImMax(g.DrawListSharedData.ClipRectFullscreen.z, viewport.Pos.x + viewport.Size.x)
        g.DrawListSharedData.ClipRectFullscreen.w = ImMax(g.DrawListSharedData.ClipRectFullscreen.w, viewport.Pos.y + viewport.Size.y)

        -- Store initial DpiScale before the OS platform window creation, based on expected monitor data.
        -- This is so we can select an appropriate font size on the first frame of our window lifetime
        viewport.DpiScale = ImGui.GetViewportPlatformMonitor(viewport).DpiScale
    end

    viewport.Window = window
    viewport.LastFrameActive = g.FrameCount
    viewport:UpdateWorkRect()
    IM_ASSERT(window == nil or viewport.ID == window.ID)

    if window ~= nil then
        window.ViewportOwned = true
    end

    return viewport
end

--- @param viewport ImGuiViewportP
function ImGui.DestroyViewport(viewport)
    -- Clear references to this viewport in windows (window->ViewportId becomes the master data)
    local g = GImGui
    for i = 1, g.Windows.Size do
        local window = g.Windows.Data[i]
        if window.Viewport == viewport then
            window.Viewport = nil
            window.ViewportOwned = false
        end
    end

    if viewport == g.MouseLastHoveredViewport then
        g.MouseLastHoveredViewport = nil
    end

    -- Destroy
    IMGUI_DEBUG_LOG_VIEWPORT("[viewport] Delete Viewport %08X '%s'", viewport.ID, viewport.Window and viewport.Window.Name or "n/a")
    ImGui.DestroyPlatformWindow(viewport)  -- In most circumstances the platform window will already be destroyed here.
    IM_ASSERT(not g.PlatformIO.Viewports:contains(viewport))
    IM_ASSERT(g.Viewports.Data[viewport.Idx] == viewport)
    g.Viewports:erase(viewport.Idx)
    -- IM_DELETE(viewport)
end

--- @param window ImGuiWindow
function ImGui.WindowSelectViewport(window)
    local g = GImGui
    local flags = window.Flags
    window.ViewportAllowPlatformMonitorExtend = -1

    -- Restore main viewport if multi-viewport is not supported by the backend
    local main_viewport = ImGui.GetMainViewport() --[[@as ImGuiViewportP]]
    if bit32.band(g.ConfigFlagsCurrFrame, ImGuiConfigFlags.ViewportsEnable) == 0 then
        ImGui.SetWindowViewport(window, main_viewport)
        return
    end
    window.ViewportOwned = false

    -- Appearing popups reset their viewport so they can inherit again
    if bit32.band(flags, bit32.bor(ImGuiWindowFlags.Popup, ImGuiWindowFlags.Tooltip)) ~= 0 and window.Appearing then
        window.Viewport = nil
        window.ViewportId = 0
    end

    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasViewport) == 0 then
        -- By default inherit from parent window
        if window.Viewport == nil and window.ParentWindow and (not window.ParentWindow.IsFallbackWindow or window.ParentWindow.WasActive) then
            window.Viewport = window.ParentWindow.Viewport
        end

        -- Attempt to restore saved viewport id (= window that hasn't been activated yet), try to restore the viewport based on saved 'window->ViewportPos' restored from .ini file
        if window.Viewport == nil and window.ViewportId ~= 0 then
            window.Viewport = ImGui.FindViewportByID(window.ViewportId) --[[@as ImGuiViewportP]]
            if window.Viewport == nil and window.ViewportPos.x ~= FLT_MAX and window.ViewportPos.y ~= FLT_MAX then
                window.Viewport = ImGui.AddUpdateViewport(window, window.ID, window.ViewportPos, window.Size, ImGuiViewportFlags.None)
            end
        end
    end

    local lock_viewport = false
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasViewport) ~= 0 then
        -- Code explicitly request a viewport
        window.Viewport = ImGui.FindViewportByID(g.NextWindowData.ViewportId) --[[@as ImGuiViewportP]]
        window.ViewportId = g.NextWindowData.ViewportId  -- Store ID even if Viewport isn't resolved yet.
        if window.Viewport and bit32.band(window.Flags, ImGuiWindowFlags.DockNodeHost) ~= 0 and window.Viewport.Window ~= nil then
            window.Viewport.Window = window
            window.Viewport.ID = window.ID
            window.ViewportId = window.ID  -- Overwrite ID (always owned by node)
        end
        lock_viewport = true
    elseif bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 or bit32.band(flags, ImGuiWindowFlags.ChildMenu) ~= 0 then
        -- Always inherit viewport from parent window
        if window.DockNode and window.DockNode.HostWindow then
            IM_ASSERT(window.DockNode.HostWindow.Viewport == window.ParentWindow.Viewport)
        end
        window.Viewport = window.ParentWindow.Viewport
    elseif window.DockNode and window.DockNode.HostWindow then
        -- This covers the "always inherit viewport from parent window" case for when a window reattach to a node that was just created mid-frame
        window.Viewport = window.DockNode.HostWindow.Viewport
    elseif bit32.band(flags, ImGuiWindowFlags.Tooltip) ~= 0 then
        window.Viewport = g.MouseViewport
    elseif ImGui.GetWindowAlwaysWantOwnViewport(window) then
        window.Viewport = ImGui.AddUpdateViewport(window, window.ID, window.Pos, window.Size, ImGuiViewportFlags.None)
    elseif g.MovingWindow and g.MovingWindow.RootWindowDockTree == window and ImGui.IsMousePosValid() then
        if window.Viewport ~= nil and window.Viewport.Window == window then
            window.Viewport = ImGui.AddUpdateViewport(window, window.ID, window.Pos, window.Size, ImGuiViewportFlags.None)
        end
    else
        -- Merge into host viewport?
        -- We cannot test window->ViewportOwned as it set lower in the function.
        -- Testing (g.ActiveId == 0 || g.ActiveIdAllowOverlap) to avoid merging during a short-term widget interaction. Main intent was to avoid during resize (see #4212)
        local try_to_merge_into_host_viewport = (window.Viewport and window == window.Viewport.Window and (g.ActiveId == 0 or g.ActiveIdAllowOverlap))
        if try_to_merge_into_host_viewport then
            ImGui.UpdateTryMergeWindowIntoHostViewports(window)
        end
    end

    -- Fallback: merge in default viewport if z-order matches, otherwise create a new viewport
    if window.Viewport == nil then
        --- @cast main_viewport ImGuiViewportP
        if not ImGui.UpdateTryMergeWindowIntoHostViewport(window, main_viewport) then
            window.Viewport = ImGui.AddUpdateViewport(window, window.ID, window.Pos, window.Size, ImGuiViewportFlags.None)
        end
    end

    -- Mark window as allowed to protrude outside of its viewport and into the current monitor
    if not lock_viewport then
        if bit32.band(flags, bit32.bor(ImGuiWindowFlags.Tooltip, ImGuiWindowFlags.Popup)) ~= 0 then
            -- We need to take account of the possibility that mouse may become invalid.
            -- Popups/Tooltip always set ViewportAllowPlatformMonitorExtend so GetWindowAllowedExtentRect() will return full monitor bounds.
            local mouse_ref = bit32.band(flags, ImGuiWindowFlags.Tooltip) ~= 0 and g.IO.MousePos or g.BeginPopupStack.Data[g.BeginPopupStack.Size].OpenMousePos
            local use_mouse_ref = not g.NavCursorVisible or not g.NavHighlightItemUnderNav or not g.NavWindow
            local mouse_valid = ImGui.IsMousePosValid(mouse_ref)
            if (window.Appearing or bit32.band(flags, bit32.bor(ImGuiWindowFlags.Tooltip, ImGuiWindowFlags.ChildMenu)) ~= 0) and (not use_mouse_ref or mouse_valid) then
                local pos_to_use = (use_mouse_ref and mouse_valid) and mouse_ref or ImGui.NavCalcPreferredRefPos(window.Flags)
                window.ViewportAllowPlatformMonitorExtend = ImGui.FindPlatformMonitorForPos(pos_to_use)
            else
                window.ViewportAllowPlatformMonitorExtend = window.Viewport.PlatformMonitor
            end
        elseif window.Viewport and window ~= window.Viewport.Window and window.Viewport.Window and bit32.band(flags, ImGuiWindowFlags.ChildWindow) == 0 and window.DockNode == nil then
            -- When called from Begin() we don't have access to a proper version of the Hidden flag yet, so we replicate this code.
            local will_be_visible = (window.DockIsActive and not window.DockTabIsVisible) and false or true
            if bit32.band(window.Flags, ImGuiWindowFlags.DockNodeHost) ~= 0 and window.Viewport.LastFrameActive < g.FrameCount and will_be_visible then
                -- Steal/transfer ownership
                IMGUI_DEBUG_LOG_VIEWPORT("[viewport] Window '%s' steal Viewport %08X from Window '%s'", window.Name, window.Viewport.ID, window.Viewport.Window.Name)
                window.Viewport.Window = window
                window.Viewport.ID = window.ID
                window.Viewport.LastNameHash = 0
            elseif not ImGui.UpdateTryMergeWindowIntoHostViewports(window) then  -- Merge?
                -- New viewport
                window.Viewport = ImGui.AddUpdateViewport(window, window.ID, window.Pos, window.Size, ImGuiViewportFlags.NoFocusOnAppearing)
            end
        elseif window.ViewportAllowPlatformMonitorExtend < 0 and bit32.band(flags, ImGuiWindowFlags.ChildWindow) == 0 then
            -- Regular (non-child, non-popup) windows by default are also allowed to protrude
            -- Child windows are kept contained within their parent.
            window.ViewportAllowPlatformMonitorExtend = window.Viewport.PlatformMonitor
        end
    end

    -- Update flags
    window.ViewportOwned = (window == window.Viewport.Window)
    window.ViewportId = window.Viewport.ID

    -- If the OS window has a title bar, hide our imgui title bar
    -- if window.ViewportOwned and bit32.band(window.Viewport.Flags, ImGuiViewportFlags.NoDecoration) == 0 then
    --     window.Flags = bit32.bor(window.Flags, ImGuiWindowFlags.NoTitleBar)
    -- end
end

--- @param window                  ImGuiWindow
--- @param parent_window_in_stack? ImGuiWindow
function ImGui.WindowSyncOwnedViewport(window, parent_window_in_stack)
    local g = GImGui
    local viewport_rect_changed = false

    -- Synchronize window --> viewport in most situations
    -- Synchronize viewport -> window in case the platform window has been moved or resized from the OS/WM
    if window.Viewport.PlatformRequestMove then
        ImVec2_Copy(window.Pos, window.Viewport.Pos)
        -- ImGui.MarkIniSettingsDirty(window)
    elseif window.Viewport.Pos.x ~= window.Pos.x or window.Viewport.Pos.y ~= window.Pos.y then
        viewport_rect_changed = true
        ImVec2_Copy(window.Viewport.Pos, window.Pos)
    end

    if window.Viewport.PlatformRequestResize then
        ImVec2_Copy(window.Size, window.Viewport.Size)
        ImVec2_Copy(window.SizeFull, window.Viewport.Size)
        -- ImGui.MarkIniSettingsDirty(window)
    elseif window.Viewport.Size.x ~= window.Size.x or window.Viewport.Size.y ~= window.Size.y then
        viewport_rect_changed = true
        ImVec2_Copy(window.Viewport.Size, window.Size)
    end
    window.Viewport:UpdateWorkRect()

    -- The viewport may have changed monitor since the global update in UpdateViewportsNewFrame()
    -- Either a SetNextWindowPos() call in the current frame or a SetWindowPos() call in the previous frame may have this effect.
    if viewport_rect_changed then
        ImGui.UpdateViewportPlatformMonitor(window.Viewport)
    end

    -- Update common viewport flags
    local viewport_flags_to_clear = bit32.bor(ImGuiViewportFlags.TopMost, ImGuiViewportFlags.NoTaskBarIcon, ImGuiViewportFlags.NoDecoration, ImGuiViewportFlags.NoRendererClear)
    local viewport_flags = bit32.band(window.Viewport.Flags, bit32.bnot(viewport_flags_to_clear))
    local window_flags = window.Flags
    local is_modal = bit32.band(window_flags, ImGuiWindowFlags.Modal) ~= 0
    local is_short_lived_floating_window = bit32.band(window_flags, bit32.bor(ImGuiWindowFlags.ChildMenu, ImGuiWindowFlags.Tooltip, ImGuiWindowFlags.Popup)) ~= 0

    if bit32.band(window_flags, ImGuiWindowFlags.Tooltip) ~= 0 then
        viewport_flags = bit32.bor(viewport_flags, ImGuiViewportFlags.TopMost)
    end

    if (g.IO.ConfigViewportsNoTaskBarIcon or is_short_lived_floating_window) and not is_modal then
        viewport_flags = bit32.bor(viewport_flags, ImGuiViewportFlags.NoTaskBarIcon)
    end

    if g.IO.ConfigViewportsNoDecoration or is_short_lived_floating_window then
        viewport_flags = bit32.bor(viewport_flags, ImGuiViewportFlags.NoDecoration)
    end

    -- Not correct to set modal as topmost because:
    -- - Because other popups can be stacked above a modal (e.g. combo box in a modal)
    -- - ImGuiViewportFlags.TopMost is currently handled different in backends
    -- if bit32.band(window_flags, ImGuiWindowFlags.Modal) ~= 0 then
    --     viewport_flags = bit32.bor(viewport_flags, ImGuiViewportFlags.TopMost)
    -- end

    -- For popups and menus that may be protruding out of their parent viewport, we enable _NoFocusOnClick so that clicking on them
    -- won't steal the OS focus away from their parent window (which may be reflected in OS the title bar decoration).
    -- Setting _NoFocusOnClick would technically prevent us from bringing back to front in case they are being covered by an OS window from a different app,
    -- but it shouldn't be much of a problem considering those are already popups that are closed when clicking elsewhere.
    if is_short_lived_floating_window and not is_modal then
        viewport_flags = bit32.bor(viewport_flags, ImGuiViewportFlags.NoFocusOnAppearing, ImGuiViewportFlags.NoFocusOnClick)
    end

    -- We can overwrite viewport flags using ImGuiWindowClass (advanced users)
    if window.WindowClass.ViewportFlagsOverrideSet ~= 0 then
        viewport_flags = bit32.bor(viewport_flags, window.WindowClass.ViewportFlagsOverrideSet)
    end
    if window.WindowClass.ViewportFlagsOverrideClear ~= 0 then
        viewport_flags = bit32.band(viewport_flags, bit32.bnot(window.WindowClass.ViewportFlagsOverrideClear))
    end

    -- We can also tell the backend that clearing the platform window won't be necessary,
    -- as our window background is filling the viewport and we have disabled BgAlpha.
    -- FIXME: Work on support for per-viewport transparency (#2766)
    if bit32.band(window_flags, ImGuiWindowFlags.NoBackground) == 0 then
        viewport_flags = bit32.bor(viewport_flags, ImGuiViewportFlags.NoRendererClear)
    end

    window.Viewport.Flags = viewport_flags

    -- Update parent viewport ID
    -- (the !IsFallbackWindow test mimic the one done in WindowSelectViewport())
    if window.WindowClass.ParentViewportId ~= 0xFFFFFFFF then
        local old_parent_viewport_id = window.Viewport.ParentViewportId
        window.Viewport.ParentViewportId = window.WindowClass.ParentViewportId
        if window.Viewport.ParentViewportId ~= old_parent_viewport_id then
            window.Viewport.ParentViewport = ImGui.FindViewportByID(window.Viewport.ParentViewportId) --[[@as ImGuiViewport]]
        end
    elseif bit32.band(window_flags, bit32.bor(ImGuiWindowFlags.Popup, ImGuiWindowFlags.Tooltip)) ~= 0 and parent_window_in_stack and (not parent_window_in_stack.IsFallbackWindow or parent_window_in_stack.WasActive) then
        window.Viewport.ParentViewport = parent_window_in_stack.Viewport
        window.Viewport.ParentViewportId = parent_window_in_stack.Viewport.ID
    else
        if g.IO.ConfigViewportsNoDefaultParent then
            window.Viewport.ParentViewport = nil
        else
            window.Viewport.ParentViewport = ImGui.GetMainViewport()
        end
        window.Viewport.ParentViewportId = g.IO.ConfigViewportsNoDefaultParent and 0 or IMGUI_VIEWPORT_DEFAULT_ID
    end
end

function ImGui.UpdatePlatformWindows()
    local g = GImGui
    IM_ASSERT(g.FrameCountEnded == g.FrameCount, "Forgot to call Render() or EndFrame() before UpdatePlatformWindows()?")
    IM_ASSERT(g.FrameCountPlatformEnded < g.FrameCount)
    g.FrameCountPlatformEnded = g.FrameCount
    if bit32.band(g.ConfigFlagsCurrFrame, ImGuiConfigFlags.ViewportsEnable) == 0 then
        return
    end

    -- Create/resize/destroy platform windows to match each active viewport.
    -- Skip the main viewport (index 0), which is always fully handled by the application!
    for i = 2, g.Viewports.Size do
        repeat
        local viewport = g.Viewports.Data[i]

        -- Destroy platform window if the viewport hasn't been submitted or if it is hosting a hidden window
        -- (the implicit/fallback Debug##Default window will be registering its viewport then be disabled, causing a dummy DestroyPlatformWindow to be made each frame)
        local destroy_platform_window = false
        destroy_platform_window = destroy_platform_window or (viewport.LastFrameActive < g.FrameCount - 1)
        destroy_platform_window = destroy_platform_window or (viewport.Window and not ImGui.IsWindowActiveAndVisible(viewport.Window)) --[[@as bool]]
        if destroy_platform_window then
            ImGui.DestroyPlatformWindow(viewport)
            break
        end

        -- New windows that appears directly in a new viewport won't always have a size on their first frame
        if viewport.LastFrameActive < g.FrameCount or viewport.Size.x <= 0 or viewport.Size.y <= 0 then
            break
        end

        -- Create window
        local is_new_platform_window = not viewport.PlatformWindowCreated
        if is_new_platform_window then
            IMGUI_DEBUG_LOG_VIEWPORT("[viewport] Create Platform Window %08X '%s'", viewport.ID, viewport.Window and viewport.Window.Name or "n/a")
            g.PlatformIO.Platform_CreateWindow(viewport)
            if g.PlatformIO.Renderer_CreateWindow ~= nil then
                g.PlatformIO.Renderer_CreateWindow(viewport)
            end
            g.PlatformWindowsCreatedCount = g.PlatformWindowsCreatedCount + 1
            viewport.LastNameHash = 0
            ImVec2_CopyV(viewport.LastPlatformPos, FLT_MAX, FLT_MAX)
            ImVec2_CopyV(viewport.LastPlatformSize, FLT_MAX, FLT_MAX) -- By clearing those we'll enforce a call to Platform_SetWindowPos/Size below, before Platform_ShowWindow (FIXME: Is that necessary?)
            ImVec2_Copy(viewport.LastRendererSize, viewport.Size)     -- We don't need to call Renderer_SetWindowSize() as it is expected Renderer_CreateWindow() already did it.
            viewport.PlatformWindowCreated = true
        end

        -- Apply Position and Size (from ImGui to Platform/Renderer backends)
        if (viewport.LastPlatformPos.x ~= viewport.Pos.x or viewport.LastPlatformPos.y ~= viewport.Pos.y) and not viewport.PlatformRequestMove then
            g.PlatformIO.Platform_SetWindowPos(viewport, viewport.Pos)
        end
        if (viewport.LastPlatformSize.x ~= viewport.Size.x or viewport.LastPlatformSize.y ~= viewport.Size.y) and not viewport.PlatformRequestResize then
            g.PlatformIO.Platform_SetWindowSize(viewport, viewport.Size)
        end
        if (viewport.LastRendererSize.x ~= viewport.Size.x or viewport.LastRendererSize.y ~= viewport.Size.y) and g.PlatformIO.Renderer_SetWindowSize ~= nil then
            g.PlatformIO.Renderer_SetWindowSize(viewport, viewport.Size)
        end
        ImVec2_Copy(viewport.LastPlatformPos, viewport.Pos)
        ImVec2_Copy(viewport.LastPlatformSize, viewport.Size)
        ImVec2_Copy(viewport.LastRendererSize, viewport.Size)

        -- Update title bar (if it changed)
        local window_for_title = GetWindowForTitleDisplay(viewport.Window)
        if window_for_title ~= nil then
            local title = window_for_title.Name
            local title_begin = 1
            local title_end = ImGui.FindRenderedTextEnd(title)
            local title_hash = ImHashStr(title, title_end - title_begin)
            if viewport.LastNameHash ~= title_hash then
                -- This still creates new strings
                g.PlatformIO.Platform_SetWindowTitle(viewport, string.sub(title, title_begin, title_end - 1))
                viewport.LastNameHash = title_hash
            end
        end

        -- Update alpha (if it changed)
        if viewport.LastAlpha ~= viewport.Alpha and g.PlatformIO.Platform_SetWindowAlpha ~= nil then
            g.PlatformIO.Platform_SetWindowAlpha(viewport, viewport.Alpha)
        end
        viewport.LastAlpha = viewport.Alpha

        -- Optional, general purpose call to allow the backend to perform general book-keeping even if things haven't changed.
        if g.PlatformIO.Platform_UpdateWindow ~= nil then
            g.PlatformIO.Platform_UpdateWindow(viewport)
        end

        if is_new_platform_window then
            -- On startup ensure new platform window don't steal focus (give it a few frames, as nested contents may lead to viewport being created a few frames late)
            if g.FrameCount < 3 then
                viewport.Flags = bit32.bor(viewport.Flags, ImGuiViewportFlags.NoFocusOnAppearing)
            end

            -- Show window
            g.PlatformIO.Platform_ShowWindow(viewport)
        end

        -- Clear request flags
        viewport:ClearRequestFlags()

        until true
    end
end

-- This is a default/basic function for performing the rendering/swap of multiple Platform Windows.
-- Custom renderers may prefer to not call this function at all, and instead iterate the publicly exposed platform data and handle rendering/sync themselves.
-- The Render/Swap functions stored in ImGuiPlatformIO are merely here to allow for this helper to exist, but you can do it yourself:
--
--    local platform_io = ImGui.GetPlatformIO()
--    for i = 2, platform_io.Viewports.Size do
--        if bit32.band(platform_io.Viewports.Data[i].Flags, ImGuiViewportFlags.IsMinimized) == 0 then
--            MyRenderFunction(platform_io.Viewports.Data[i], my_args)
--        end
--    end
--    for i = 2, platform_io.Viewports.Size do
--        if bit32.band(platform_io.Viewports.Data[i].Flags, ImGuiViewportFlags.IsMinimized) == 0 then
--            MySwapBufferFunction(platform_io.Viewports.Data[i], my_args)
--        end
--    end
--
function ImGui.RenderPlatformWindowsDefault(platform_render_arg, renderer_render_arg)
    -- Skip the main viewport (index 1 in Lua), which is always fully handled by the application!
    local platform_io = ImGui.GetPlatformIO()

    -- First pass: render all windows
    for i = 2, platform_io.Viewports.Size do
        local viewport = platform_io.Viewports.Data[i]
        if bit32.band(viewport.Flags, ImGuiViewportFlags.IsMinimized) == 0 then
            if platform_io.Platform_RenderWindow then
                platform_io.Platform_RenderWindow(viewport, platform_render_arg)
            end
            if platform_io.Renderer_RenderWindow then
                platform_io.Renderer_RenderWindow(viewport, renderer_render_arg)
            end
        end
    end

    -- Second pass: swap buffers for all windows
    for i = 2, platform_io.Viewports.Size do
        local viewport = platform_io.Viewports.Data[i]
        if bit32.band(viewport.Flags, ImGuiViewportFlags.IsMinimized) == 0 then
            if platform_io.Platform_SwapBuffers then
                platform_io.Platform_SwapBuffers(viewport, platform_render_arg)
            end
            if platform_io.Renderer_SwapBuffers then
                platform_io.Renderer_SwapBuffers(viewport, renderer_render_arg)
            end
        end
    end
end

--- @param pos ImVec2
function ImGui.FindPlatformMonitorForPos(pos)
    local g = GImGui
    for monitor_n = 1, g.PlatformIO.Monitors.Size do
        local monitor = g.PlatformIO.Monitors.Data[monitor_n]
        if ImRect(monitor.MainPos, monitor.MainPos + monitor.MainSize):Contains(pos) then
            return monitor_n
        end
    end
    return -1
end

--- @param rect ImRect
--- @return int
function ImGui.FindPlatformMonitorForRect(rect)
    local g = GImGui
    local monitor_count = g.PlatformIO.Monitors.Size

    if monitor_count <= 1 then
        return monitor_count
    end

    -- Use a minimum threshold of 1.0f so a zero-sized rect won't false positive, and will still find the correct monitor given its position.
    -- This is necessary for tooltips which always resize down to zero at first.
    local surface_threshold = math.max(rect:GetWidth() * rect:GetHeight() * 0.5, 1.0)
    local best_monitor_n = 1  -- Default to the first monitor as fallback
    local best_monitor_surface = 0.001

    for monitor_n = 1, g.PlatformIO.Monitors.Size do
        if best_monitor_surface >= surface_threshold then
            break
        end

        local monitor = g.PlatformIO.Monitors.Data[monitor_n]
        local monitor_rect = ImRect(monitor.MainPos, monitor.MainPos + monitor.MainSize)

        if monitor_rect:Contains(rect) then
            return monitor_n
        end

        local overlapping_rect = ImRect(rect.Min.x, rect.Min.y, rect.Max.x, rect.Max.y)
        overlapping_rect:ClipWithFull(monitor_rect)
        local overlapping_surface = overlapping_rect:GetWidth() * overlapping_rect:GetHeight()

        if overlapping_surface > best_monitor_surface then
            best_monitor_surface = overlapping_surface
            best_monitor_n = monitor_n
        end
    end

    return best_monitor_n
end

--- @param viewport ImGuiViewportP
function ImGui.UpdateViewportPlatformMonitor(viewport)
    viewport.PlatformMonitor = ImGui.FindPlatformMonitorForRect(viewport:GetMainRect())
end

--- @param viewport_p ImGuiViewport
--- @return ImGuiPlatformMonitor
function ImGui.GetViewportPlatformMonitor(viewport_p)
    local g = GImGui
    local viewport = viewport_p --- @cast viewport ImGuiViewportP

    local monitor_idx = viewport.PlatformMonitor
    if monitor_idx >= 1 and monitor_idx <= g.PlatformIO.Monitors.Size then
        return g.PlatformIO.Monitors.Data[monitor_idx]
    end
    return g.FallbackMonitor
end

--- @param viewport ImGuiViewportP
function ImGui.DestroyPlatformWindow(viewport)
    local g = GImGui
    if viewport.PlatformWindowCreated then
        IMGUI_DEBUG_LOG_VIEWPORT("[viewport] Destroy Platform Window %08X '%s'", viewport.ID, viewport.Window and viewport.Window.Name or "n/a")
        if g.PlatformIO.Renderer_DestroyWindow then
            g.PlatformIO.Renderer_DestroyWindow(viewport)
        end
        if g.PlatformIO.Platform_DestroyWindow then
            g.PlatformIO.Platform_DestroyWindow(viewport)
        end
        IM_ASSERT(viewport.RendererUserData == nil and viewport.PlatformUserData == nil)

        -- Don't clear PlatformWindowCreated for the main viewport, as we initially set that up to true in Initialize()
        -- The righter way may be to leave it to the backend to set this flag all-together, and made the flag public.
        if viewport.ID ~= IMGUI_VIEWPORT_DEFAULT_ID then
            viewport.PlatformWindowCreated = false
        end
    else
        IM_ASSERT(viewport.RendererUserData == nil and viewport.PlatformUserData == nil and viewport.PlatformHandle == nil)
    end
    viewport.RendererUserData = nil
    viewport.PlatformUserData = nil
    viewport.PlatformHandle = nil
    viewport:ClearRequestFlags()
end

function ImGui.DestroyPlatformWindows()
    local g = GImGui
    for _, viewport in g.Viewports:iter() do
        ImGui.DestroyPlatformWindow(viewport)
    end
end

---------------------------------------------------------------------------------------
-- [SECTION] METRICS/DEBUGGER WINDOW
---------------------------------------------------------------------------------------

--- @param draw_list ImDrawList
--- @param viewport  ImGuiViewport
--- @param bb        ImRect
function ImGui.DebugRenderViewportThumbnail(draw_list, viewport, bb)
    local g = GImGui
    local window = g.CurrentWindow

    local scale = bb:GetSize() / viewport.Size
    local off = bb.Min - viewport.Pos * scale
    local alpha_mul = (bit32.band(viewport.Flags, ImGuiViewportFlags.IsMinimized) ~= 0) and 0.30 or 1.00
    window.DrawList:AddRectFilled(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.Border, alpha_mul * 0.40))

    for _, thumb_window in g.Windows:iter() do
        repeat
        if not thumb_window.WasActive or bit32.band(thumb_window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
            break
        end
        if thumb_window.Viewport ~= viewport then
            break
        end

        local thumb_r = thumb_window:Rect()
        local title_r = thumb_window:TitleBarRect()
        thumb_r = ImRect(ImTrunc(off + thumb_r.Min * scale), ImTrunc(off + thumb_r.Max * scale))
        title_r = ImRect(ImTrunc(off + title_r.Min * scale), ImTrunc(off + ImVec2(title_r.Max.x, title_r.Min.y + title_r:GetHeight() * 3.0) * scale))
        thumb_r:ClipWithFull(bb)
        title_r:ClipWithFull(bb)
        local window_is_focused = g.NavWindow and thumb_window.RootWindowForTitleBarHighlight == g.NavWindow.RootWindowForTitleBarHighlight
        window.DrawList:AddRectFilled(thumb_r.Min, thumb_r.Max, ImGui.GetColorU32(ImGuiCol.WindowBg, alpha_mul))
        window.DrawList:AddRectFilled(title_r.Min, title_r.Max, ImGui.GetColorU32(window_is_focused and ImGuiCol.TitleBgActive or ImGuiCol.TitleBg, alpha_mul))
        window.DrawList:AddRect(thumb_r.Min, thumb_r.Max, ImGui.GetColorU32(ImGuiCol.Border, alpha_mul))
        window.DrawList:AddText(g.Font, g.FontSize * 1.0, title_r.Min, ImGui.GetColorU32(ImGuiCol.Text, alpha_mul), thumb_window.Name, 1, ImGui.FindRenderedTextEnd(thumb_window.Name))

        until true
    end

    draw_list:AddRect(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.Border, alpha_mul))
    if viewport.ID == g.DebugMetricsConfig.HighlightViewportID then
        window.DrawList:AddRect(bb.Min, bb.Max, IM_COL32(255, 255, 0, 255))
    end
end

local function RenderViewportsThumbnails()
    local g = GImGui
    local window = g.CurrentWindow

    local SCALE = 1.0 / 8.0
    local bb_full = ImRect(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX)
    for _, monitor in g.PlatformIO.Monitors:iter() do
        bb_full:Add(ImRect(monitor.MainPos, monitor.MainPos + monitor.MainSize))
    end

    local p = window.DC.CursorPos
    local off = p - bb_full.Min * SCALE
    for _, monitor in g.PlatformIO.Monitors:iter() do
        local monitor_draw_bb = ImRect(off + monitor.MainPos * SCALE, off + (monitor.MainPos + monitor.MainSize) * SCALE)
        window.DrawList:AddRect(monitor_draw_bb.Min, monitor_draw_bb.Max, (g.DebugMetricsConfig.HighlightMonitorIdx == g.PlatformIO.Monitors:index_from_ptr(monitor)) and IM_COL32(255, 255, 0, 255) or ImGui.GetColorU32(ImGuiCol.Border), 4.0)
        window.DrawList:AddRectFilled(monitor_draw_bb.Min, monitor_draw_bb.Max, ImGui.GetColorU32(ImGuiCol.Border, 0.10), 4.0)
    end

    for _, viewport in g.Viewports:iter() do
        local viewport_draw_bb = ImRect(off + viewport.Pos * SCALE, off + (viewport.Pos + viewport.Size) * SCALE)
        ImGui.DebugRenderViewportThumbnail(window.DrawList, viewport, viewport_draw_bb)
    end
    ImGui.Dummy(bb_full:GetSize() * SCALE)
end

-- TODO:
--- @param open bool?
function ImGui.ShowMetricsWindow(open)
    local g = GImGui

    local ret
    open, ret = ImGui.Begin("ImGui Sincerely Metrics/Debugger", open)
    if not ret or ImGui.GetCurrentWindow().BeginCount > 1 then
        ImGui.End()
        return open
    end

    if ImGui.TreeNode(string.format("Viewports (%d)", g.Viewports.Size)) then
        -- ImGui.SetNextItemOpen(true, ImGuiCond.Once)
        if ImGui.TreeNode("Windows Minimap") then
            RenderViewportsThumbnails()
            ImGui.TreePop()
        end

        ImGui.TreePop()
    end

    if ImGui.TreeNode("Memory allocations") then
        local info = g.DebugAllocInfo
        ImGui.Text("%d current allocations", info.TotalAllocCount - info.TotalFreeCount)
        ImGui.Text("Releasing selected unused buffers after: %.2f secs", g.IO.ConfigMemoryCompactTimer)
        if ImGui.SmallButton("GC now") then
            g.GcCompactAll = true
        end
        ImGui.Text("Recent frames with allocations:")
        local buf_size = #info.LastEntriesBuf
        for n = buf_size, 1, -1 do
            local idx = (info.LastEntriesIdx - n + buf_size) % buf_size + 1
            local entry = info.LastEntriesBuf[idx]
            ImGui.BulletText("Frame %06d: %+3d ( %2d alloc, %2d free )", entry.FrameCount, entry.AllocCount - entry.FreeCount, entry.AllocCount, entry.FreeCount)
            if n == 0 then
                ImGui.SameLine()
                ImGui.Text("<- %d frames ago", g.FrameCount - entry.FrameCount)
            end
        end

        ImGui.TreePop()
    end

    ImGui.End()
    return open
end



--- @param idx ImGuiCol
--- @return ImVec4  # live reference to the style color (like upstream's const&)
function ImGui.GetStyleColorVec4(idx)
    return GImGui.Style.Colors[idx]
end

function ImGui.ErrorCheckUsingSetCursorPosToExtendParentBoundaries()
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT(window.DC.IsSetPos)
    window.DC.IsSetPos = false
    if window.DC.CursorPos.x <= window.DC.CursorMaxPos.x and window.DC.CursorPos.y <= window.DC.CursorMaxPos.y then return end
    if window.SkipItems then return end
    -- Upstream asserts (user error): "Code uses SetCursorPos()/SetCursorScreenPos() to extend window/parent boundaries.
    -- Please submit an item e.g. Dummy() afterwards". We keep the old, tolerant behavior instead of erroring.
    window.DC.CursorMaxPos = ImMax(window.DC.CursorMaxPos, window.DC.CursorPos)
end

---------------------------------------------------------------------------------------
-- [SECTION] POPUPS: modals, context popups, dimming
---------------------------------------------------------------------------------------

local function GetWindowDisplayLayer(window)
    return (bit32.band(window.Flags, ImGuiWindowFlags.Tooltip) ~= 0) and 1 or 0
end

--- @return int # 0-based display index (like upstream), -1 if not found
function ImGui.FindWindowDisplayIndex(window)
    local g = GImGui
    local i = g.Windows:find_index(window)
    return i and (i - 1) or -1
end

function ImGui.BringWindowToDisplayBack(window)
    local g = GImGui
    if g.Windows.Data[1] == window then return end
    local i = g.Windows:find_index(window)
    if i then
        table.remove(g.Windows.Data, i)
        table.insert(g.Windows.Data, 1, window)
    end
end

function ImGui.FindBottomMostVisibleWindowWithinBeginStack(parent_window)
    local g = GImGui
    local bottom_most_visible_window = parent_window
    for i = ImGui.FindWindowDisplayIndex(parent_window), 0, -1 do
        local window = g.Windows.Data[i + 1]
        if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) == 0 then
            if not ImGui.IsWindowWithinBeginStackOf(window, parent_window) then break end
            if ImGui.IsWindowActiveAndVisible(window) and GetWindowDisplayLayer(window) <= GetWindowDisplayLayer(parent_window) then
                bottom_most_visible_window = window
            end
        end
    end
    return bottom_most_visible_window
end

function ImGui.GetTopMostAndVisiblePopupModal()
    local g = GImGui
    for n = g.OpenPopupStack.Size, 1, -1 do
        local popup = g.OpenPopupStack.Data[n].Window
        if popup and bit32.band(popup.Flags, ImGuiWindowFlags.Modal) ~= 0 and ImGui.IsWindowActiveAndVisible(popup) then
            return popup
        end
    end
    return nil
end

function ImGui.RenderDimmedBackgroundBehindWindow(window, col)
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end
    local viewport = window.Viewport
    local viewport_rect = viewport:GetMainRect()
    -- Draw behind window by moving the draw command at the FRONT of the draw list
    local draw_list = (window.RootWindowDockTree or window.RootWindow).DrawList
    draw_list:ChannelsMerge()
    if draw_list.CmdBuffer.Size == 0 then draw_list:AddDrawCmd() end
    draw_list:PushClipRect(viewport_rect.Min - ImVec2(1, 1), viewport_rect.Max + ImVec2(1, 1), false)
    draw_list:AddRectFilled(viewport_rect.Min, viewport_rect.Max, col)
    local cmd = draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size]
    draw_list.CmdBuffer:pop_back()
    draw_list.CmdBuffer:push_front(cmd)
    draw_list:AddDrawCmd()
    draw_list:PopClipRect()
end

function ImGui.RenderDimmedBackgrounds()
    local g = GImGui
    local modal_window = ImGui.GetTopMostAndVisiblePopupModal()
    if g.DimBgRatio <= 0.0 and g.NavWindowingHighlightAlpha <= 0.0 then return end
    local dim_bg_for_modal = (modal_window ~= nil)
    local dim_bg_for_window_list = (g.NavWindowingTargetAnim ~= nil and g.NavWindowingTargetAnim.Active)
    if not dim_bg_for_modal and not dim_bg_for_window_list then return end

    if dim_bg_for_modal then
        local dim_behind_window = ImGui.FindBottomMostVisibleWindowWithinBeginStack(modal_window)
        ImGui.RenderDimmedBackgroundBehindWindow(dim_behind_window, ImGui.GetColorU32(modal_window.DC.ModalDimBgColor, g.DimBgRatio, true))
    elseif dim_bg_for_window_list then
        ImGui.RenderDimmedBackgroundBehindWindow(g.NavWindowingTargetAnim, ImGui.GetColorU32(ImGuiCol.NavWindowingDimBg, g.DimBgRatio))
        if g.NavWindowingListWindow ~= nil and g.NavWindowingListWindow.Active and g.NavWindowingListWindow.Viewport and g.NavWindowingListWindow.Viewport ~= g.NavWindowingTargetAnim.Viewport then
            ImGui.RenderDimmedBackgroundBehindWindow(g.NavWindowingListWindow, ImGui.GetColorU32(ImGuiCol.NavWindowingDimBg, g.DimBgRatio))
        end
        -- Draw border around Ctrl+Tab target window
        local window = g.NavWindowingTargetAnim
        local viewport = window.Viewport
        local distance = g.FontSize
        local bb = window:Rect()
        bb:Expand(distance)
        if bb:GetWidth() >= viewport.Size.x and bb:GetHeight() >= viewport.Size.y then bb:Expand(-distance - 1.0) end
        window.DrawList:ChannelsMerge()
        if window.DrawList.CmdBuffer.Size == 0 then window.DrawList:AddDrawCmd() end
        window.DrawList:PushClipRect(viewport.Pos, viewport.Pos + viewport.Size)
        window.DrawList:AddRect(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.NavWindowingHighlight, g.NavWindowingHighlightAlpha), window.WindowRounding, 0, 3.0)
        window.DrawList:PopClipRect()
    end
end

function ImGui.ClosePopupsExceptModals()
    local g = GImGui
    local popup_count_to_keep = g.OpenPopupStack.Size
    while popup_count_to_keep > 0 do
        local window = g.OpenPopupStack.Data[popup_count_to_keep].Window
        if not window or bit32.band(window.Flags, ImGuiWindowFlags.Modal) ~= 0 then break end
        popup_count_to_keep = popup_count_to_keep - 1
    end
    if popup_count_to_keep < g.OpenPopupStack.Size then
        ImGui.ClosePopupToLevel(popup_count_to_keep, true)
    end
end

--- @return bool visible, bool? p_open   # p_open is the updated value of the optional close button flag
function ImGui.BeginPopupModal(name, p_open, flags)
    if flags == nil then flags = 0 end
    local g = GImGui
    local window = g.CurrentWindow
    local id = window:GetID(name)
    if not ImGui.IsPopupOpen(id, ImGuiPopupFlags.None) then
        g.NextWindowData:ClearFlags()
        if p_open then p_open = false end
        return false, p_open
    end

    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasPos) == 0 then
        local viewport = window.WasActive and window.Viewport or ImGui.GetMainViewport()
        ImGui.SetNextWindowPos(viewport:GetCenter(), ImGuiCond.FirstUseEver, ImVec2(0.5, 0.5))
    end

    flags = bit32.bor(flags, ImGuiWindowFlags.Popup, ImGuiWindowFlags.Modal, ImGuiWindowFlags.NoCollapse, ImGuiWindowFlags.NoDocking)
    local is_open
    p_open, is_open = ImGui.Begin(name, p_open, flags)
    if not is_open or (p_open ~= nil and not p_open) then
        ImGui.EndPopup()
        if is_open then ImGui.ClosePopupToLevel(g.BeginPopupStack.Size, true) end
        return false, p_open
    end
    return is_open, p_open
end

function ImGui.IsPopupOpenRequestForWindow(popup_flags)
    local g = GImGui
    local mouse_button = ImGui.GetMouseButtonFromPopupFlags(popup_flags)
    if ImGui.IsMouseReleased(mouse_button, ImGuiKeyOwner_NoOwner) and ImGui.IsWindowHovered(ImGuiHoveredFlags.AllowWhenBlockedByPopup) then
        if bit32.band(popup_flags, ImGuiPopupFlags.NoOpenOverItems) == 0 or not ImGui.IsAnyItemHovered() then
            return true
        end
    end
    if g.NavOpenContextMenuWindowId and g.NavOpenContextMenuWindowId ~= 0 and g.CurrentWindow.ID ~= 0 then
        if ImGui.IsWindowChildOf(g.NavWindow, g.CurrentWindow, false, false) then return true end
    end
    return false
end

function ImGui.BeginPopupContextWindow(str_id, popup_flags)
    if popup_flags == nil then popup_flags = 0 end
    local g = GImGui
    local window = g.CurrentWindow
    if not str_id then str_id = "window_context" end
    local id = window:GetID(str_id)
    if ImGui.IsPopupOpenRequestForWindow(popup_flags) then ImGui.OpenPopupEx(id, popup_flags) end
    return ImGui.BeginPopupEx(id, bit32.bor(ImGuiWindowFlags.AlwaysAutoResize, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoSavedSettings))
end

function ImGui.BeginPopupContextVoid(str_id, popup_flags)
    if popup_flags == nil then popup_flags = 0 end
    local g = GImGui
    local window = g.CurrentWindow
    if not str_id then str_id = "void_context" end
    local id = window:GetID(str_id)
    local mouse_button = ImGui.GetMouseButtonFromPopupFlags(popup_flags)
    if ImGui.IsMouseReleased(mouse_button, id) and not ImGui.IsWindowHovered(ImGuiHoveredFlags.AnyWindow) then
        if ImGui.GetTopMostPopupModal() == nil then ImGui.OpenPopupEx(id, popup_flags) end
    end
    return ImGui.BeginPopupEx(id, bit32.bor(ImGuiWindowFlags.AlwaysAutoResize, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoSavedSettings))
end

function ImGui.BeginTooltipHidden()
    local g = GImGui
    local _, ret = ImGui.Begin("##Tooltip_Hidden", nil, bit32.bor(ImGuiWindowFlags.Tooltip, ImGuiWindowFlags.NoInputs, ImGuiWindowFlags.NoTitleBar,
        ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoSavedSettings, ImGuiWindowFlags.AlwaysAutoResize))
    ImGui.SetWindowHiddenAndSkipItemsForCurrentFrame(g.CurrentWindow)
    return ret
end

-- [SECTION] MISC GETTERS/SETTERS, FOCUS

function ImGui.NavMoveRequestResolveWithLastItem(result)
    local g = GImGui
    g.NavMoveScoringItems = false -- Ensure request doesn't need more processing
    ImGui.NavApplyItemToResult(result)
    ImGui.NavUpdateAnyRequestFlag()
end

function ImGui.SetKeyboardFocusHere(offset)
    if offset == nil then offset = 0 end
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT(offset >= -1) -- -1 is allowed but not below

    if g.DragDropActive or g.MovingWindow ~= nil then
        return
    end

    ImGui.SetNavWindow(window)

    local move_flags = bit32.bor(ImGuiNavMoveFlags.IsTabbing, ImGuiNavMoveFlags.Activate, ImGuiNavMoveFlags.FocusApi, ImGuiNavMoveFlags.NoSetNavCursorVisible)
    local scroll_flags = window.Appearing and bit32.bor(ImGuiScrollFlags.KeepVisibleEdgeX, ImGuiScrollFlags.AlwaysCenterY) or bit32.bor(ImGuiScrollFlags.KeepVisibleEdgeX, ImGuiScrollFlags.KeepVisibleEdgeY)
    ImGui.NavMoveRequestSubmit(ImGuiDir.None, (offset < 0) and ImGuiDir.Up or ImGuiDir.Down, move_flags, scroll_flags)
    if offset == -1 then
        ImGui.NavMoveRequestResolveWithLastItem(g.NavMoveResultLocal)
    else
        g.NavTabbingDir = 1
        g.NavTabbingCounter = offset + 1
    end
end

function ImGui.FocusItem()
    local g = GImGui
    local window = g.CurrentWindow
    if g.DragDropActive or g.MovingWindow ~= nil then
        return
    end
    local move_flags = bit32.bor(ImGuiNavMoveFlags.IsTabbing, ImGuiNavMoveFlags.FocusApi, ImGuiNavMoveFlags.NoSetNavCursorVisible, ImGuiNavMoveFlags.NoSelect)
    local scroll_flags = window.Appearing and bit32.bor(ImGuiScrollFlags.KeepVisibleEdgeX, ImGuiScrollFlags.AlwaysCenterY) or bit32.bor(ImGuiScrollFlags.KeepVisibleEdgeX, ImGuiScrollFlags.KeepVisibleEdgeY)
    ImGui.SetNavWindow(window)
    ImGui.NavMoveRequestSubmit(ImGuiDir.None, ImGuiDir.Up, move_flags, scroll_flags)
    ImGui.NavMoveRequestResolveWithLastItem(g.NavMoveResultLocal)
end

function ImGui.ActivateItemByID(id)
    local g = GImGui
    g.NavNextActivateId = id
    g.NavNextActivateFlags = ImGuiActivateFlags.None
end

function ImGui.SetNavCursorVisible(visible)
    local g = GImGui
    if g.NavWindow and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.NoNavInputs) ~= 0 then
        visible = false
    elseif g.IO.ConfigNavCursorVisibleAlways then
        visible = true
    end
    g.NavCursorVisible = visible
end

function ImGui.GetFrameCount() return GImGui.FrameCount end
function ImGui.GetStateStorage() return GImGui.CurrentWindow.DC.StateStorage end
function ImGui.SetStateStorage(tree)
    local window = GImGui.CurrentWindow
    window.DC.StateStorage = tree or window.StateStorage
end
function ImGui.SetNextFrameWantCaptureKeyboard(want) GImGui.WantCaptureKeyboardNextFrame = want and 1 or 0 end
function ImGui.SetNextFrameWantCaptureMouse(want) GImGui.WantCaptureMouseNextFrame = want and 1 or 0 end
function ImGui.GetVersion() return IMGUI_VERSION end

local StyleColorNames = nil
function ImGui.GetStyleColorName(idx)
    if StyleColorNames == nil then
        StyleColorNames = {}
        for k, v in pairs(ImGuiCol) do if k ~= "COUNT" then StyleColorNames[v] = k end end
    end
    return StyleColorNames[idx] or "Unknown"
end

-- [SECTION] NAV END FRAME

local NAV_WINDOWING_LIST_APPEAR_DELAY = 0.15

local function GetFallbackWindowNameForWindowingList(window)
    if bit32.band(window.Flags, ImGuiWindowFlags.Popup) ~= 0 then
        return "(Popup)"
    end
    if bit32.band(window.Flags, ImGuiWindowFlags.MenuBar) ~= 0 and window.Name == "##MainMenuBar" then
        return "(Main menu bar)"
    end
    if window.DockNodeAsHost then
        return "(Dock node)"
    end
    return "(Untitled)"
end

function ImGui.NavUpdateWindowingOverlay()
    local g = GImGui
    IM_ASSERT(g.NavWindowingTarget ~= nil)

    if g.NavWindowingTimer < NAV_WINDOWING_LIST_APPEAR_DELAY then
        return
    end

    local viewport = ImGui.GetMainViewport()
    ImGui.SetNextWindowSizeConstraints(ImVec2(viewport.Size.x * 0.20, viewport.Size.y * 0.20), ImVec2(FLT_MAX, FLT_MAX))
    ImGui.SetNextWindowPos(viewport:GetCenter(), ImGuiCond.Always, ImVec2(0.5, 0.5))
    ImGui.PushStyleVar(ImGuiStyleVar.WindowPadding, g.Style.WindowPadding * 2.0)
    ImGui.Begin("##NavWindowingOverlay", nil, bit32.bor(ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoFocusOnAppearing, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoInputs, ImGuiWindowFlags.AlwaysAutoResize, ImGuiWindowFlags.NoSavedSettings))
    g.NavWindowingListWindow = g.CurrentWindow
    for n = g.WindowsFocusOrder.Size, 1, -1 do
        local window = g.WindowsFocusOrder.Data[n]
        IM_ASSERT(window ~= nil)
        if ImGui.IsWindowNavFocusable(window) then
            local label = window.Name
            if ImGui.FindRenderedTextEnd(label) == 1 then
                label = GetFallbackWindowNameForWindowingList(window)
            end
            ImGui.Selectable(label, g.NavWindowingTarget == window)
        end
    end
    ImGui.End()
    ImGui.PopStyleVar()
end

local function NavUpdateCreateWrappingRequest()
    local g = GImGui
    local window = g.NavWindow

    local do_forward = false
    local src = window.NavRectRel[g.NavLayer]
    local bb_rel = ImRect(src.Min.x, src.Min.y, src.Max.x, src.Max.y)
    local clip_dir = g.NavMoveDir

    local move_flags = g.NavMoveFlags
    local wrap_size = (g.NavLayer == ImGuiNavLayer.Menu) and window.Size or (window.ContentSize + window.WindowPadding)

    if g.NavMoveDir == ImGuiDir.Left and bit32.band(move_flags, bit32.bor(ImGuiNavMoveFlags.WrapX, ImGuiNavMoveFlags.LoopX)) ~= 0 then
        bb_rel.Min.x = wrap_size.x; bb_rel.Max.x = wrap_size.x
        if bit32.band(move_flags, ImGuiNavMoveFlags.WrapX) ~= 0 then
            bb_rel:TranslateY(-bb_rel:GetHeight())
            clip_dir = ImGuiDir.Up
        end
        do_forward = true
    end
    if g.NavMoveDir == ImGuiDir.Right and bit32.band(move_flags, bit32.bor(ImGuiNavMoveFlags.WrapX, ImGuiNavMoveFlags.LoopX)) ~= 0 then
        bb_rel.Min.x = -window.WindowPadding.x; bb_rel.Max.x = -window.WindowPadding.x
        if bit32.band(move_flags, ImGuiNavMoveFlags.WrapX) ~= 0 then
            bb_rel:TranslateY(bb_rel:GetHeight())
            clip_dir = ImGuiDir.Down
        end
        do_forward = true
    end
    if g.NavMoveDir == ImGuiDir.Up and bit32.band(move_flags, bit32.bor(ImGuiNavMoveFlags.WrapY, ImGuiNavMoveFlags.LoopY)) ~= 0 then
        bb_rel.Min.y = wrap_size.y; bb_rel.Max.y = wrap_size.y
        if bit32.band(move_flags, ImGuiNavMoveFlags.WrapY) ~= 0 then
            bb_rel:TranslateX(-bb_rel:GetWidth())
            clip_dir = ImGuiDir.Left
        end
        do_forward = true
    end
    if g.NavMoveDir == ImGuiDir.Down and bit32.band(move_flags, bit32.bor(ImGuiNavMoveFlags.WrapY, ImGuiNavMoveFlags.LoopY)) ~= 0 then
        bb_rel.Min.y = -window.WindowPadding.y; bb_rel.Max.y = -window.WindowPadding.y
        if bit32.band(move_flags, ImGuiNavMoveFlags.WrapY) ~= 0 then
            bb_rel:TranslateX(bb_rel:GetWidth())
            clip_dir = ImGuiDir.Right
        end
        do_forward = true
    end
    if not do_forward then
        return
    end
    window.NavRectRel[g.NavLayer] = bb_rel
    ImGui.NavClearPreferredPosForAxis(ImGuiAxis.X)
    ImGui.NavClearPreferredPosForAxis(ImGuiAxis.Y)
    ImGui.NavMoveRequestForward(g.NavMoveDir, clip_dir, move_flags, g.NavMoveScrollFlags)
end

function ImGui.NavEndFrame()
    local g = GImGui

    if g.NavWindowingTarget ~= nil then
        ImGui.NavUpdateWindowingOverlay()
    end

    if g.NavWindow and ImGui.NavMoveRequestButNoResultYet() and bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.WrapMask_) ~= 0 and bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.Forwarded) == 0 then
        NavUpdateCreateWrappingRequest()
    end
end

-- [SECTION] ImGuiTextFilter

--- @class ImGuiTextFilter
MT.ImGuiTextFilter = {}
MT.ImGuiTextFilter.__index = MT.ImGuiTextFilter

--- @param default_filter? string
function ImGuiTextFilter(default_filter)
    local this = setmetatable({ InputBuf = {}, _CountExclude = 0, _Items = ImVector() }, MT.ImGuiTextFilter)
    for i = 1, 256 do this.InputBuf[i] = 0 end
    if default_filter and default_filter ~= "" then
        for i = 1, ImMin(#default_filter, 255) do this.InputBuf[i] = string.byte(default_filter, i) end
        this:Build()
    end
    return this
end

function MT.ImGuiTextFilter:Draw(label, width)
    if label == nil then label = "Filter (inc,-exc)" end
    if width ~= nil and width ~= 0.0 then ImGui.SetNextItemWidth(width) end
    return self:DrawWithHint(label, "incl -excl")
end

function MT.ImGuiTextFilter:DrawWithHint(label, hint)
    if label == nil then label = "Filter" end
    if hint == nil then hint = "incl -excl" end
    local value_changed = ImGui.InputTextWithHint(label, hint, self.InputBuf, 256)
    if value_changed then
        self:Build()
    end
    return value_changed
end

function MT.ImGuiTextFilter:Clear() self.InputBuf[1] = 0; self:Build() end
function MT.ImGuiTextFilter:IsActive() return self._Items.Size ~= 0 end

-- Items are { Text = string (lowercased), CountInclude = int }
function MT.ImGuiTextFilter:Build()
    local items = self._Items
    items:resize(0)
    self._CountExclude = 0

    local n = 0
    while self.InputBuf[n + 1] ~= nil and self.InputBuf[n + 1] ~= 0 do n = n + 1 end
    local buf = ImGui._ByteArrayToString(self.InputBuf, 1, n + 1)
    local buf_e = n + 1 -- exclusive, 1-based
    local word_b = 1
    local seq_start_idx = -1 -- 1-based index into items, -1 = none
    while word_b < buf_e do
        while word_b < buf_e and ImCharIsBlankA(string.byte(buf, word_b)) do
            word_b = word_b + 1
        end
        local is_excl = word_b < buf_e and string.byte(buf, word_b) == 45 -- '-'
        if is_excl then word_b = word_b + 1 end
        local is_quote = word_b < buf_e and string.byte(buf, word_b) == 34 -- '"'
        local word_e
        if is_quote then
            word_b = word_b + 1
            word_e = string.find(buf, '"', word_b, true) or buf_e
            if word_e > buf_e then word_e = buf_e end
        else
            word_e = word_b
            while word_e < buf_e do
                local c = string.byte(buf, word_e)
                if c == 32 or c == 44 then break end
                word_e = word_e + 1
            end
        end

        if word_e - word_b > 0 then
            local item = { Text = string.lower(string.sub(buf, word_b, word_e - 1)), CountInclude = 0 }
            if is_excl then
                items:insert(self._CountExclude + 1, item)
                self._CountExclude = self._CountExclude + 1
                if seq_start_idx ~= -1 then seq_start_idx = seq_start_idx + 1 end
            else
                if seq_start_idx == -1 then seq_start_idx = items.Size + 1 end
                items:push_back(item)
                items.Data[seq_start_idx].CountInclude = items.Data[seq_start_idx].CountInclude + 1
            end
        end

        if word_e < buf_e and string.byte(buf, word_e) == 44 then -- ','
            seq_start_idx = -1
        end
        word_b = word_e + 1
    end
end

--- @param text      string?
--- @param text_end? int     # exclusive, 1-based
function MT.ImGuiTextFilter:PassFilter(text, text_end)
    local items = self._Items
    if items.Size == 0 then return true end
    if text == nil then text = "" end
    if text_end ~= nil then text = string.sub(text, 1, text_end - 1) end
    text = string.lower(text)

    local seq = 1
    local seq_excl_end = self._CountExclude + 1
    while seq < seq_excl_end do
        if string.find(text, items.Data[seq].Text, 1, true) then return false end
        seq = seq + 1
    end

    local seq_end = items.Size + 1
    if seq == seq_end then return true end
    while seq < seq_end do
        local seq_incl_end = seq + items.Data[seq].CountInclude
        while seq < seq_incl_end do
            if not string.find(text, items.Data[seq].Text, 1, true) then break end
            seq = seq + 1
        end
        if seq == seq_incl_end then return true end
        seq = seq_incl_end
    end
    return false
end

-- [SECTION] ImGuiListClipper

ImGuiListClipperFlags = ImGuiListClipperFlags or { None = 0, NoSetTableRowCounters = bit32.lshift(1, 0) }

local function GetSkipItemForListClipping()
    local g = GImGui
    if g.CurrentTable then return g.CurrentTable.HostSkipItems end
    return g.CurrentWindow.SkipItems
end

local function ClipperRangeFromIndices(min, max) return { Min = min, Max = max, PosToIndexConvert = false, PosToIndexOffsetMin = 0, PosToIndexOffsetMax = 0 } end
local function ClipperRangeFromPositions(y1, y2, off_min, off_max) return { Min = y1, Max = y2, PosToIndexConvert = true, PosToIndexOffsetMin = off_min, PosToIndexOffsetMax = off_max } end

-- `offset` is a 0-based count of leading ranges to leave alone
local function ImGuiListClipper_SortAndFuseRanges(ranges, offset)
    if offset == nil then offset = 0 end
    if ranges.Size - offset <= 1 then return end
    local d = ranges.Data
    for sort_end = ranges.Size - offset - 1, 1, -1 do
        for i = offset + 1, sort_end + offset do
            if d[i].Min > d[i + 1].Min then d[i], d[i + 1] = d[i + 1], d[i] end
        end
    end
    local i = 2 + offset
    while i <= ranges.Size do
        IM_ASSERT(not d[i].PosToIndexConvert and not d[i - 1].PosToIndexConvert)
        if d[i - 1].Max < d[i].Min then
            i = i + 1
        else
            d[i - 1].Min = ImMin(d[i - 1].Min, d[i].Min)
            d[i - 1].Max = ImMax(d[i - 1].Max, d[i].Max)
            ranges:erase(i)
        end
    end
end

local function ImGuiListClipper_SeekCursorAndSetupPrevLine(clipper, pos_y, line_height)
    local g = GImGui
    local window = g.CurrentWindow
    local off_y = pos_y - window.DC.CursorPos.y
    window.DC.CursorPos.y = pos_y
    window.DC.CursorMaxPos.y = ImMax(window.DC.CursorMaxPos.y, pos_y - g.Style.ItemSpacing.y)
    window.DC.CursorPosPrevLine.y = window.DC.CursorPos.y - line_height
    window.DC.PrevLineSize.y = (line_height - g.Style.ItemSpacing.y)
    local columns = window.DC.CurrentColumns
    if columns then
        columns.LineMinY = window.DC.CursorPos.y
    end
    local tbl = g.CurrentTable
    if tbl then
        if tbl.IsInsideRow then
            ImGui.TableEndRow(tbl)
        end
        local row_increase = math.floor((off_y / line_height) + 0.5)
        if row_increase > 0 and bit32.band(clipper.Flags, ImGuiListClipperFlags.NoSetTableRowCounters) == 0 then
            tbl.CurrentRow = tbl.CurrentRow + row_increase
            tbl.RowBgColorCounter = tbl.RowBgColorCounter + row_increase
        end
        tbl.RowPosY2 = window.DC.CursorPos.y
    end
end

--- @class ImGuiListClipper
MT.ImGuiListClipper = {}
MT.ImGuiListClipper.__index = MT.ImGuiListClipper

function ImGuiListClipper()
    return setmetatable({ DisplayStart = 0, DisplayEnd = 0, UserIndex = 0, ItemsCount = 0, ItemsHeight = 0.0, Flags = 0,
        StartPosY = 0.0, StartSeekOffsetY = 0.0, Ctx = nil, TempData = nil }, MT.ImGuiListClipper)
end

--- @param items_count   int
--- @param items_height? float
function MT.ImGuiListClipper:Begin(items_count, items_height)
    if items_height == nil then items_height = -1.0 end
    self.Ctx = ImGui.GetCurrentContext()
    local g = self.Ctx
    local window = g.CurrentWindow

    local tbl = g.CurrentTable
    if tbl and tbl.IsInsideRow then
        ImGui.TableEndRow(tbl)
    end

    self.StartPosY = window.DC.CursorPos.y
    self.ItemsHeight = items_height
    self.ItemsCount = items_count
    self.DisplayStart = -1
    self.DisplayEnd = 0

    g.ClipperTempDataStacked = g.ClipperTempDataStacked + 1
    while g.ClipperTempDataStacked > g.ClipperTempData.Size do
        g.ClipperTempData:push_back({ ListClipper = nil, LossynessOffset = 0.0, StepNo = 0, ItemsFrozen = 0, Ranges = ImVector() })
    end
    local data = g.ClipperTempData.Data[g.ClipperTempDataStacked]
    data.ListClipper = self; data.StepNo = 0; data.ItemsFrozen = 0; data.Ranges:resize(0)
    data.LossynessOffset = window.DC.CursorStartPosLossyness.y
    self.TempData = data
    self.StartSeekOffsetY = data.LossynessOffset
end

function MT.ImGuiListClipper:End()
    local data = self.TempData
    if data then
        local g = self.Ctx
        if self.ItemsCount >= 0 and self.ItemsCount < INT_MAX and self.DisplayStart >= 0 then
            self:SeekCursorForItem(self.ItemsCount)
        end
        IM_ASSERT(data.ListClipper == self)
        data.StepNo = data.Ranges.Size
        g.ClipperTempDataStacked = g.ClipperTempDataStacked - 1
        if g.ClipperTempDataStacked > 0 then
            data = g.ClipperTempData.Data[g.ClipperTempDataStacked]
            data.ListClipper.TempData = data
        end
        self.TempData = nil
    end
    self.DisplayStart = self.ItemsCount
    self.DisplayEnd = self.ItemsCount
    self.ItemsCount = -1
end

function MT.ImGuiListClipper:IncludeItemByIndex(item_index) self:IncludeItemsByIndex(item_index, item_index + 1) end

function MT.ImGuiListClipper:IncludeItemsByIndex(item_begin, item_end)
    local data = self.TempData
    IM_ASSERT(self.DisplayStart < 0)
    IM_ASSERT(item_begin <= item_end)
    if item_begin < item_end then
        data.Ranges:push_back(ClipperRangeFromIndices(item_begin, item_end))
    end
end

function MT.ImGuiListClipper:SeekCursorForItem(item_n)
    local pos_y = self.StartPosY + self.StartSeekOffsetY + item_n * self.ItemsHeight
    ImGuiListClipper_SeekCursorAndSetupPrevLine(self, pos_y, self.ItemsHeight)
end

local function ImGuiListClipper_StepInternal(clipper)
    local g = clipper.Ctx
    local window = g.CurrentWindow
    local data = clipper.TempData
    IM_ASSERT(data ~= nil, "Called ImGuiListClipper::Step() too many times, or before ImGuiListClipper::Begin() ?")

    local tbl = g.CurrentTable
    if tbl and tbl.IsInsideRow then
        ImGui.TableEndRow(tbl)
    end

    if clipper.ItemsCount == 0 or GetSkipItemForListClipping() then
        return false
    end

    if data.StepNo == 0 and tbl ~= nil and not tbl.IsUnfrozenRows then
        clipper.DisplayStart = data.ItemsFrozen
        clipper.DisplayEnd = ImMin(data.ItemsFrozen + 1, clipper.ItemsCount)
        if clipper.DisplayStart < clipper.DisplayEnd then
            data.ItemsFrozen = data.ItemsFrozen + 1
        end
        return true
    end

    local calc_clipping = false
    if data.StepNo == 0 then
        clipper.StartPosY = window.DC.CursorPos.y
        if clipper.ItemsHeight <= 0.0 then
            data.Ranges:push_front(ClipperRangeFromIndices(data.ItemsFrozen, data.ItemsFrozen + 1))
            clipper.DisplayStart = ImMax(data.Ranges.Data[1].Min, data.ItemsFrozen)
            clipper.DisplayEnd = ImMin(data.Ranges.Data[1].Max, clipper.ItemsCount)
            data.StepNo = 1
            return true
        end
        calc_clipping = true
    end

    if clipper.ItemsHeight <= 0.0 then
        IM_ASSERT(data.StepNo == 1)
        -- (no float precision mitigation needed: Luau numbers are doubles)
        clipper.ItemsHeight = (window.DC.CursorPos.y - clipper.StartPosY) / (clipper.DisplayEnd - clipper.DisplayStart)
        if clipper.ItemsHeight == 0.0 and clipper.ItemsCount == INT_MAX then
            return false
        end
        if clipper.ItemsHeight <= 0.0 then
            IM_ASSERT_USER_ERROR(clipper.ItemsHeight > 0.0, "ImGuiListClipper: Failed to calculate item height! First item hasn't been submitted by user code, or has not moved the cursor vertically!")
            return false
        end
        calc_clipping = true
    end

    local already_submitted = clipper.DisplayEnd
    if calc_clipping then
        clipper.StartSeekOffsetY = data.LossynessOffset - data.ItemsFrozen * clipper.ItemsHeight

        if g.LogEnabled then
            data.Ranges:push_back(ClipperRangeFromIndices(0, clipper.ItemsCount))
        else
            local is_nav_request = (g.NavMoveScoringItems and g.NavWindow and g.NavWindow.RootWindowForNav == window.RootWindowForNav) and true or false
            local nav_off_min = (is_nav_request and g.NavMoveClipDir == ImGuiDir.Up) and -1 or 0
            local nav_off_max = (is_nav_request and g.NavMoveClipDir == ImGuiDir.Down) and 1 or 0
            if is_nav_request then
                data.Ranges:push_back(ClipperRangeFromPositions(g.NavScoringRect.Min.y, g.NavScoringRect.Max.y, nav_off_min, nav_off_max))
                if not g.NavScoringNoClipRect:IsInverted() then
                    data.Ranges:push_back(ClipperRangeFromPositions(g.NavScoringNoClipRect.Min.y, g.NavScoringNoClipRect.Max.y, nav_off_min, nav_off_max))
                end
            end
            if is_nav_request and bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.IsTabbing) ~= 0 and g.NavTabbingDir == -1 then
                data.Ranges:push_back(ClipperRangeFromIndices(clipper.ItemsCount - 1, clipper.ItemsCount))
            end

            local nav_rect_abs = ImGui.WindowRectRelToAbs(window, window.NavRectRel[0])
            if g.NavId ~= 0 and window.NavLastIds[0] == g.NavId then
                data.Ranges:push_back(ClipperRangeFromPositions(nav_rect_abs.Min.y, nav_rect_abs.Max.y, 0, 0))
            end

            local min_y = window.ClipRect.Min.y
            local max_y = window.ClipRect.Max.y

            local bs = g.BoxSelectState
            if bs and bs.IsActive and bs.Window == window then
                local pad_y = g.Style.ItemSpacing.y
                min_y = min_y - pad_y
                max_y = max_y + pad_y
                if bs.UnclipMode then
                    data.Ranges:push_back(ClipperRangeFromPositions(bs.UnclipRect.Min.y - pad_y, bs.UnclipRect.Max.y + pad_y, 0, 0))
                end
            end

            data.Ranges:push_back(ClipperRangeFromPositions(min_y, max_y, nav_off_min, nav_off_max))
        end

        for _, range in data.Ranges:iter() do
            if range.PosToIndexConvert then
                local m1 = ImTrunc((range.Min - window.DC.CursorPos.y - data.LossynessOffset) / clipper.ItemsHeight)
                local m2 = ImTrunc(((range.Max - window.DC.CursorPos.y - data.LossynessOffset) / clipper.ItemsHeight) + 0.999999)
                range.Min = ImClamp(already_submitted + m1 + range.PosToIndexOffsetMin, already_submitted, clipper.ItemsCount - 1)
                range.Max = ImClamp(already_submitted + m2 + range.PosToIndexOffsetMax, range.Min + 1, clipper.ItemsCount)
                range.PosToIndexConvert = false
            end
        end
        ImGuiListClipper_SortAndFuseRanges(data.Ranges, data.StepNo)
    end

    while data.StepNo < data.Ranges.Size do
        local r = data.Ranges.Data[data.StepNo + 1]
        clipper.DisplayStart = ImMax(r.Min, already_submitted)
        clipper.DisplayEnd = ImMin(r.Max, clipper.ItemsCount)
        data.StepNo = data.StepNo + 1
        if clipper.DisplayStart < clipper.DisplayEnd then
            if clipper.DisplayStart > already_submitted then
                clipper:SeekCursorForItem(clipper.DisplayStart)
            end
            return true
        end
    end

    if clipper.ItemsCount < INT_MAX then
        clipper:SeekCursorForItem(clipper.ItemsCount)
    end
    return false
end

function MT.ImGuiListClipper:Step()
    local ret = ImGuiListClipper_StepInternal(self)
    if ret and (self.DisplayStart >= self.DisplayEnd) then
        ret = false
    end
    if not ret then
        self:End()
    end
    return ret
end

function ImGui.CalcClipRectVisibleItemsY(clip_rect, pos, items_height)
    local out_visible_start = ImMax(ImTrunc((clip_rect.Min.y - pos.y) / items_height), 0)
    local out_visible_end = ImMax(ImTrunc(ImCeil((clip_rect.Max.y - pos.y) / items_height)), out_visible_start)
    return out_visible_start, out_visible_end
end

-- [SECTION] ERROR CHECKING, STATE RECOVERY

function ImGuiErrorRecoveryState()
    return { SizeOfWindowStack = 0, SizeOfIDStack = 0, SizeOfTreeStack = 0, SizeOfColorStack = 0, SizeOfStyleVarStack = 0,
             SizeOfFontStack = 0, SizeOfFocusScopeStack = 0, SizeOfGroupStack = 0, SizeOfItemFlagsStack = 0,
             SizeOfBeginPopupStack = 0, SizeOfDisabledStack = 0 }
end

function ImGui.ErrorRecoveryStoreState(state_out)
    local g = GImGui
    state_out.SizeOfWindowStack = g.CurrentWindowStack.Size
    state_out.SizeOfIDStack = g.CurrentWindow.IDStack.Size
    state_out.SizeOfTreeStack = g.CurrentWindow.DC.TreeDepth -- NOT g.TreeNodeStack.Size which is a partial stack!
    state_out.SizeOfColorStack = g.ColorStack.Size
    state_out.SizeOfStyleVarStack = g.StyleVarStack.Size
    state_out.SizeOfFontStack = g.FontStack.Size
    state_out.SizeOfFocusScopeStack = g.FocusScopeStack.Size
    state_out.SizeOfGroupStack = g.GroupStack.Size
    state_out.SizeOfItemFlagsStack = g.ItemFlagsStack.Size
    state_out.SizeOfBeginPopupStack = g.BeginPopupStack.Size
    state_out.SizeOfDisabledStack = g.DisabledStackSize
end

function ImGui.ErrorRecoveryTryToRecoverState(state_in)
    local g = GImGui
    while g.CurrentWindowStack.Size > state_in.SizeOfWindowStack do
        local window = g.CurrentWindow
        if bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
            if g.CurrentTable ~= nil and g.CurrentTable.InnerWindow == g.CurrentWindow then
                IM_ASSERT_USER_ERROR(false, "Missing EndTable()")
                ImGui.EndTable()
            else
                IM_ASSERT_USER_ERROR(false, "Missing EndChild()")
                ImGui.EndChild()
            end
        else
            IM_ASSERT_USER_ERROR(false, "Missing End()")
            ImGui.End()
        end
    end
    if g.CurrentWindowStack.Size == state_in.SizeOfWindowStack then
        ImGui.ErrorRecoveryTryToRecoverWindowState(state_in)
    end
end

function ImGui.ErrorRecoveryTryToRecoverWindowState(state_in)
    local g = GImGui

    while g.CurrentTable ~= nil and g.CurrentTable.InnerWindow == g.CurrentWindow do
        IM_ASSERT_USER_ERROR(false, "Missing EndTable()")
        ImGui.EndTable()
    end

    local window = g.CurrentWindow

    -- FIXME: Can't recover from inside BeginTabItem/EndTabItem yet.
    while g.CurrentTabBar ~= nil and g.CurrentTabBar.Window == window do
        IM_ASSERT_USER_ERROR(false, "Missing EndTabBar()")
        ImGui.EndTabBar()
    end
    while g.CurrentMultiSelect ~= nil and g.CurrentMultiSelect.Storage.Window == window and ImGui.EndMultiSelect do
        IM_ASSERT_USER_ERROR(false, "Missing EndMultiSelect()")
        ImGui.EndMultiSelect()
    end
    if window.DC.MenuBarAppending then
        IM_ASSERT_USER_ERROR(false, "Missing EndMenuBar()")
        ImGui.EndMenuBar()
    end
    while window.DC.TreeDepth > state_in.SizeOfTreeStack do
        IM_ASSERT_USER_ERROR(false, "Missing TreePop()")
        ImGui.TreePop()
    end
    while g.GroupStack.Size > state_in.SizeOfGroupStack do
        IM_ASSERT_USER_ERROR(false, "Missing EndGroup()")
        ImGui.EndGroup()
    end
    IM_ASSERT(g.GroupStack.Size == state_in.SizeOfGroupStack)
    while window.IDStack.Size > state_in.SizeOfIDStack do
        IM_ASSERT_USER_ERROR(false, "Missing PopID()")
        ImGui.PopID()
    end
    while g.DisabledStackSize > state_in.SizeOfDisabledStack do
        IM_ASSERT_USER_ERROR(false, "Missing EndDisabled()")
        if bit32.band(g.CurrentItemFlags, ImGuiItemFlags.Disabled) ~= 0 then
            ImGui.EndDisabled()
        else
            ImGui.EndDisabledOverrideReenable()
            g.CurrentWindowStack:back().DisabledOverrideReenable = false
        end
    end
    IM_ASSERT(g.DisabledStackSize == state_in.SizeOfDisabledStack)
    while g.ColorStack.Size > state_in.SizeOfColorStack do
        IM_ASSERT_USER_ERROR(false, "Missing PopStyleColor()")
        ImGui.PopStyleColor()
    end
    while g.ItemFlagsStack.Size > state_in.SizeOfItemFlagsStack do
        IM_ASSERT_USER_ERROR(false, "Missing PopItemFlag()")
        ImGui.PopItemFlag()
    end
    while g.StyleVarStack.Size > state_in.SizeOfStyleVarStack do
        IM_ASSERT_USER_ERROR(false, "Missing PopStyleVar()")
        ImGui.PopStyleVar()
    end
    while g.FontStack.Size > state_in.SizeOfFontStack do
        IM_ASSERT_USER_ERROR(false, "Missing PopFont()")
        ImGui.PopFont()
    end
    while g.FocusScopeStack.Size > state_in.SizeOfFocusScopeStack do
        IM_ASSERT_USER_ERROR(false, "Missing PopFocusScope()")
        ImGui.PopFocusScope()
    end
end

-- Lines are stored in g.DebugLogBuf (one chunk per call)
function ImGui.DebugLog(fmt, ...)
    local g = GImGui
    g.DebugLogBuf = g.DebugLogBuf or ImGuiTextBuffer()
    local str = string.format("[%05d] ", g.FrameCount) .. ((select("#", ...) > 0) and string.format(fmt, ...) or fmt)
    g.DebugLogBuf:append(str)
    if bit32.band(g.DebugLogFlags, ImGuiDebugLogFlags.OutputToTTY) ~= 0 then
        print(str)
    end
end

--- @return bool should_assert
function ImGui.ErrorLog(msg)
    local g = GImGui
    if g == nil then return true end
    local window = g.CurrentWindow

    if g.IO.ConfigErrorRecoveryEnableDebugLog then
        if g.ErrorFirst then
            ImGui.DebugLog(string.format("[imgui-error] (current settings: Assert=%d, Log=%d, Tooltip=%d)\n",
                g.IO.ConfigErrorRecoveryEnableAssert and 1 or 0, g.IO.ConfigErrorRecoveryEnableDebugLog and 1 or 0, g.IO.ConfigErrorRecoveryEnableTooltip and 1 or 0))
        end
        ImGui.DebugLog(string.format("[imgui-error] In window '%s': %s\n", window and window.Name or "NULL", tostring(msg)))
    end
    g.ErrorFirst = false

    if g.IO.ConfigErrorRecoveryEnableTooltip then
        if g.WithinFrameScope and ImGui.BeginErrorTooltip() then
            if g.ErrorCountCurrentFrame < 20 then
                ImGui.Text("In window '%s': %s", window and window.Name or "NULL", tostring(msg))
                if window and (not window.IsFallbackWindow or window.WasActive) then
                    ImGui.GetForegroundDrawList(window.Viewport):AddRect(window.Pos, window.Pos + window.Size, IM_COL32(255, 0, 0, 255))
                end
            end
            if g.ErrorCountCurrentFrame == 20 then
                ImGui.Text("(and more errors)")
            end
            ImGui.EndErrorTooltip()
        end
        g.ErrorCountCurrentFrame = g.ErrorCountCurrentFrame + 1
    end

    if g.ErrorCallback ~= nil then
        g.ErrorCallback(g, g.ErrorCallbackUserData, msg)
    end

    return g.IO.ConfigErrorRecoveryEnableAssert
end

function ImGui.ErrorCheckEndFrameFinalizeErrorTooltip()
    local g = GImGui
    if g.DebugDrawIdConflictsId ~= 0 and g.IO.KeyCtrl == false then
        g.DebugDrawIdConflictsCount = g.HoveredIdPreviousFrameItemCount
    end
    if g.DebugDrawIdConflictsId ~= 0 and not g.DebugItemPickerActive and ImGui.BeginErrorTooltip() then
        ImGui.Text("Programmer error: %d visible items with conflicting ID!", g.DebugDrawIdConflictsCount)
        ImGui.BulletText("Code should use PushID()/PopID() in loops, or append \"##xx\" to same-label identifiers!")
        ImGui.BulletText("Empty label e.g. Button(\"\") == same ID as parent widget/node. Use Button(\"##xx\") instead!")
        ImGui.BulletText("Set io.ConfigDebugHighlightIdConflicts=false to disable this warning in non-programmers builds.")
        ImGui.Separator()
        ImGui.Text("(Hold Ctrl to: ")
        ImGui.SameLine(0.0, 0.0)
        ImGui.TextLinkOpenURL("read FAQ \"About ID Stack System\"", "https://github.com/ocornut/imgui/blob/master/docs/FAQ.md#qa-usage")
        ImGui.SameLine(0.0, 0.0)
        ImGui.Text(")")
        ImGui.EndErrorTooltip()
    end

    if g.ErrorCountCurrentFrame > 0 and ImGui.BeginErrorTooltip() then
        ImGui.Separator()
        ImGui.Text("(Hold Ctrl to: ")
        ImGui.SameLine(0.0, 0.0)
        if ImGui.SmallButton("Enable Asserts") then
            g.IO.ConfigErrorRecoveryEnableAssert = true
        end
        ImGui.SameLine(0, 0)
        ImGui.Text(")")
        ImGui.EndErrorTooltip()
    end
end

function ImGui.BeginErrorTooltip()
    local g = GImGui
    local window = ImGui.FindWindowByName("##Tooltip_Error")
    local use_locked_pos = g.IO.KeyCtrl and window ~= nil and window.WasActive
    local c = g.Style.Colors[ImGuiCol.PopupBg]
    ImGui.PushStyleColor(ImGuiCol.PopupBg, ImVec4(ImLerp(c.x, 1.0, 0.15), ImLerp(c.y, 0.0, 0.15), ImLerp(c.z, 0.0, 0.15), ImLerp(c.w, 1.0, 0.15)))
    if use_locked_pos then
        ImGui.SetNextWindowPos(g.ErrorTooltipLockedPos)
    end
    local _, is_visible = ImGui.Begin("##Tooltip_Error", nil, bit32.bor(ImGuiWindowFlags.Tooltip, ImGuiWindowFlags.NoDecoration, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoSavedSettings, ImGuiWindowFlags.AlwaysAutoResize))
    ImGui.PopStyleColor()
    if is_visible and g.CurrentWindow.BeginCount == 1 then
        ImGui.SeparatorText("MESSAGE FROM DEAR IMGUI")
        ImGui.BringWindowToDisplayFront(g.CurrentWindow)
        ImGui.BringWindowToFocusFront(g.CurrentWindow)
        g.ErrorTooltipLockedPos = ImGui.GetWindowPos()
    elseif not is_visible then
        ImGui.End()
    end
    return is_visible
end

function ImGui.EndErrorTooltip()
    ImGui.End()
end

return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imgui_demo.lua'] = function()
--- ImGui Sincerely WIP
-- (Demo Code) Port of imgui_demo.cpp (docking branch)
-- This file: shared demo helpers, ShowDemoWindow(), DemoWindowMenuBar(), DemoWindowWidgets() dispatcher, example tree/image viewer helpers.
-- Other parts (all global functions, loaded from the same bundle):
--   imgui_demo_w1.lua    : DemoWindowWidgets{Basic,Bullets,CollapsingHeaders,ColorAndPickers,ComboBoxes,DataTypes,...}
--   imgui_demo_w2.lua    : DemoWindowWidgets{QueryingStatuses,Selectables,SelectionAndMultiSelect}
--   imgui_demo_w3.lua    : DemoWindowWidgets{Tabs,Text,TextInput,Tooltips,TreeNodes,VerticalSliders}
--   imgui_demo_style.lua : ShowAboutWindow, ShowStyleEditor, ShowUserGuide, ShowExampleMenuFile, ...
--   imgui_demo_2.lua     : Layout, Popups, Tables, Columns, Inputs + example apps

local _

----------------------------------------------------------------
-- Shared helpers (globals)
----------------------------------------------------------------

function IMGUI_DEMO_MARKER(_) end -- upstream hook, no-op here

--- Helper to display a little (?) mark which shows a tooltip when hovered.
function HelpMarker(desc)
    ImGui.TextDisabled("(?)")
    if ImGui.BeginItemTooltip() then
        ImGui.PushTextWrapPos(ImGui.GetFontSize() * 35.0)
        ImGui.TextUnformatted(desc)
        ImGui.PopTextWrapPos()
        ImGui.EndTooltip()
    end
end

function ShowDockingDisabledMessage()
    local io = ImGui.GetIO()
    ImGui.Text("ERROR: Docking is not enabled! See Demo > Configuration.")
    ImGui.Text("Set io.ConfigFlags |= ImGuiConfigFlags_DockingEnable in your code, or ")
    ImGui.SameLine(0.0, 0.0)
    if ImGui.SmallButton("click here") then
        io.ConfigFlags = bit32.bor(io.ConfigFlags, ImGuiConfigFlags.DockingEnable)
    end
end

function DemoNotSupported() ImGui.TextDisabled("(not supported on Roblox)") end
function DemoNotPorted(what) ImGui.TextDisabled("(not ported yet%s)", what and (": " .. what) or "") end
function DemoB2I(b) return b and 1 or 0 end
function DemoHas(flags, f) return bit32.band(flags, f) ~= 0 end
function DemoClamp(v, mn, mx) return (v < mn) and mn or (v > mx) and mx or v end

--- `char buf[size] = "str"` -> zero-terminated byte table
function DemoBuf(str, size)
    local t = {}
    for i = 1, #str do t[i] = string.byte(str, i) end
    t[#str + 1] = 0
    if size then for i = #str + 2, size do t[i] = 0 end end
    return t
end
--- byte table -> Lua string (up to the zero terminator)
function DemoBufStr(buf)
    local n = 0
    while buf[n + 1] ~= nil and buf[n + 1] ~= 0 do n = n + 1 end
    if n == 0 then return "" end
    return ImGui._ByteArrayToString(buf, 1, n + 1)
end

--- "a\0b\0c\0\0" -> { "a", "b", "c" }
function DemoItems(s)
    if type(s) == "table" then return s end
    local t = {}
    for item in string.gmatch(s, "([^%z]+)") do t[#t + 1] = item end
    return t
end

--- Combo() one-liner. `idx` is 0-based; `items` is a table of strings (1-based) or a "\0"-separated string.
--- Uses ImGui.Combo if it exists, falls back to BeginCombo/Selectable.
--- @return int idx, bool changed
function DemoCombo(label, idx, items, popup_max_height_in_items)
    items = DemoItems(items)
    if ImGui.Combo then
        return ImGui.Combo(label, idx, items, #items, popup_max_height_in_items or -1)
    end
    local changed = false
    local preview = (idx >= 0 and idx < #items) and items[idx + 1] or ""
    if ImGui.BeginCombo(label, preview) then
        for n = 0, #items - 1 do
            local is_selected = (idx == n)
            if ImGui.Selectable(items[n + 1], is_selected) then
                idx = n
                changed = true
            end
            if is_selected then ImGui.SetItemDefaultFocus() end
        end
        ImGui.EndCombo()
    end
    return idx, changed
end

--- ListBox() one-liner (see DemoCombo)
function DemoListBox(label, idx, items, height_in_items)
    items = DemoItems(items)
    if ImGui.ListBox then
        return ImGui.ListBox(label, idx, items, #items, height_in_items or -1)
    end
    local changed = false
    if height_in_items == nil or height_in_items < 0 then height_in_items = math.min(#items, 7) end
    local height_in_items_f = height_in_items + 0.25
    local height_in_pixels = math.floor(ImGui.GetTextLineHeightWithSpacing() * height_in_items_f + ImGui.GetStyle().FramePadding.y * 2.0)
    if ImGui.BeginListBox and ImGui.BeginListBox(label, ImVec2(0.0, height_in_pixels)) then
        for n = 0, #items - 1 do
            local is_selected = (idx == n)
            if ImGui.Selectable(items[n + 1], is_selected) then
                idx = n
                changed = true
            end
            if is_selected then ImGui.SetItemDefaultFocus() end
        end
        ImGui.EndListBox()
    elseif not ImGui.BeginListBox then
        DemoNotPorted("ListBox")
    end
    return idx, changed
end

--- Closable header: CollapsingHeader(label, &p_open). Returns visible, open.
function DemoCollapsingHeaderClosable(label, open)
    return ImGui.CollapsingHeader(label, open)
end

--- ImColor::HSV() as ImVec4
function DemoHSV(h, s, v, a)
    local r, g, b = ImGui.ColorConvertHSVtoRGB(h, s, v)
    return ImVec4(r, g, b, a or 1.0)
end

--- Minimal ImGuiTextFilter when the library one isn't available (Draw/DrawWithHint/PassFilter/Clear/IsActive)
function DemoTextFilter()
    if ImGuiTextFilter then return ImGuiTextFilter() end
    local f = { InputBuf = DemoBuf("", 256) }
    local function parse(self)
        local inc, exc = {}, {}
        for tok in string.gmatch(string.lower(DemoBufStr(self.InputBuf)), "[^,%s]+") do
            if string.sub(tok, 1, 1) == "-" then
                if #tok > 1 then exc[#exc + 1] = string.sub(tok, 2) end
            else
                inc[#inc + 1] = tok
            end
        end
        return inc, exc
    end
    function f:Draw(label, width)
        if width and width ~= 0 then ImGui.SetNextItemWidth(width) end
        return ImGui.InputText(label or "Filter (inc,-exc)", self.InputBuf, 256)
    end
    function f:DrawWithHint(label, hint, width)
        if width and width ~= 0 then ImGui.SetNextItemWidth(width) end
        return ImGui.InputTextWithHint(label, hint, self.InputBuf, 256)
    end
    function f:Clear() self.InputBuf[1] = 0 end
    function f:IsActive() return self.InputBuf[1] ~= 0 and self.InputBuf[1] ~= nil end
    function f:PassFilter(text)
        local inc, exc = parse(self)
        text = string.lower(text)
        for _, e in ipairs(exc) do if string.find(text, e, 1, true) then return false end end
        if #inc == 0 then return true end
        for _, i in ipairs(inc) do if string.find(text, i, 1, true) then return true end end
        return false
    end
    return f
end

----------------------------------------------------------------
-- [SECTION] Demo Window data
----------------------------------------------------------------

--- Data to be shared across different functions of the demo.
function ImGuiDemoWindowData()
    return {
        -- Examples Apps (accessible from the "Examples" menu)
        ShowMainMenuBar = false,
        ShowAppAssetsBrowser = false,
        ShowAppConsole = false,
        ShowAppCustomRendering = false,
        ShowAppDocuments = false,
        ShowAppDockSpace = false,
        ShowAppImageViewer = false,
        ShowAppLog = false,
        ShowAppLayout = false,
        ShowAppPropertyEditor = false,
        ShowAppSimpleOverlay = false,
        ShowAppAutoResize = false,
        ShowAppConstrainedResize = false,
        ShowAppFullscreen = false,
        ShowAppLongText = false,
        ShowAppWindowTitles = false,

        -- Dear ImGui Tools (accessible from the "Tools" menu)
        ShowMetrics = false,
        ShowDebugLog = false,
        ShowIDStackTool = false,
        ShowStyleEditor = false,
        ShowAbout = false,

        -- Other data
        DisableSections = false,
        LiveEditOverride = false,
        LiveEditFlags = ImGuiItemFlags.LiveEditOnInputText or 0,
        DemoTree = nil,
    }
end

----------------------------------------------------------------
-- [SECTION] Helpers: ExampleTreeNode, ExampleMemberInfo (for use by Property Editor & Multi-Select demos)
----------------------------------------------------------------

function ExampleTreeNode()
    return {
        -- Tree structure
        Name = "",
        UID = 0,
        Parent = nil,
        Childs = {},         -- 1-based
        IndexInParent = 0,   -- 0-based

        -- Leaf Data
        HasData = false,     -- All leaves have data
        DataMyBool = true,
        DataMyInt = 128,
        DataMyVec2 = ImVec2(0.0, 3.141592),
    }
end

function ExampleTree_CreateNode(name, uid, parent)
    local node = ExampleTreeNode()
    node.Name = string.sub(name, 1, 27)
    node.UID = uid
    node.Parent = parent
    node.IndexInParent = parent and #parent.Childs or 0
    if parent then
        parent.Childs[#parent.Childs + 1] = node
    end
    return node
end

function ExampleTree_DestroyNode(node) end -- GC

--- Create example tree data
function ExampleTree_CreateDemoTree()
    local ROOT_ITEMS_COUNT = 20
    local category_names = { "Apple", "Banana", "Cherry", "Kiwi", "Mango", "Orange", "Pear", "Pineapple", "Strawberry", "Watermelon" }
    local category_count = #category_names
    local uid = 0
    uid = uid + 1
    local node_L0 = ExampleTree_CreateNode("<ROOT>", uid, nil)
    for idx_L0 = 0, ROOT_ITEMS_COUNT - 1 do
        local name_buf = string.format("%s %d", category_names[idx_L0 // (ROOT_ITEMS_COUNT // category_count) + 1], idx_L0 % (ROOT_ITEMS_COUNT // category_count))
        uid = uid + 1
        local node_L1 = ExampleTree_CreateNode(name_buf, uid, node_L0)
        local number_of_childs = #node_L1.Name
        for idx_L1 = 0, number_of_childs - 1 do
            uid = uid + 1
            local node_L2 = ExampleTree_CreateNode(string.format("Child %d", idx_L1), uid, node_L1)
            node_L2.HasData = true
            if idx_L1 == 0 then
                uid = uid + 1
                local node_L3 = ExampleTree_CreateNode(string.format("Sub-child %d", 0), uid, node_L2)
                node_L3.HasData = true
            end
        end
    end
    return node_L0
end

----------------------------------------------------------------
-- [SECTION] Helpers: ExampleImageViewer
----------------------------------------------------------------

function ExampleImageViewerData()
    return {
        ImageBgColor = IM_COL32(100, 100, 100, 255),
        GridColor    = IM_COL32(255, 255, 255, 100),
        GridEnabled  = true,
        ViewReset    = true,
        ViewOffset   = ImVec2(0, 0), -- in image space
        Zoom         = 10.0,
        ZoomMin      = 1.0,
        ZoomMax      = 10000.0,
    }
end

function ExampleImageViewer_DrawOptions(data)
    ImGui.SetNextItemShortcut(ImGuiKey.G, ImGuiInputFlags.Tooltip)
    _, data.GridEnabled = ImGui.Checkbox("Grid", data.GridEnabled)
    ImGui.SameLine()
    ImGui.SetNextItemWidth(ImGui.GetFontSize() * 10.0)
    local zoom_100 = data.Zoom * 100.0
    local changed
    zoom_100, changed = ImGui.DragFloat("##Zoom", zoom_100, 5.0, data.ZoomMin * 100.0, data.ZoomMax * 100.0, "%.0f%%", ImGuiSliderFlags.AlwaysClamp)
    if changed then
        data.Zoom = zoom_100 / 100.0
    end
end

function ExampleImageViewer_DrawCanvas(data, canvas_size, image_tex_ref, image_w, image_h)
    local io = ImGui.GetIO()
    local platform_io = ImGui.GetPlatformIO()
    local draw_list = ImGui.GetWindowDrawList()
    IM_ASSERT(canvas_size.x >= 0.0 and canvas_size.y >= 0.0)

    -- Layout canvas
    ImGui.InvisibleButton("##Canvas", canvas_size)
    local canvas_min = ImGui.GetItemRectMin()
    local canvas_max = ImGui.GetItemRectMax()

    if data.ViewReset then
        data.ViewOffset = ImVec2((canvas_size.x * 0.5 / data.Zoom) - 0.5, (canvas_size.y * 0.5 / data.Zoom) - 0.5) -- Add half a pixel padding
    end
    data.ViewReset = false

    -- Handle inputs
    if ImGui.SetItemKeyOwner(ImGuiKey.MouseWheelY) then
        if io.MouseWheel ~= 0.0 then
            data.Zoom = DemoClamp(data.Zoom * (1.0 + io.MouseWheel * 0.10), data.ZoomMin, data.ZoomMax)
        end
    end
    local zoom = data.Zoom
    if ImGui.IsItemActive() and ImGui.IsMouseDragging(0) then
        data.ViewOffset.x = data.ViewOffset.x - io.MouseDelta.x / zoom
        data.ViewOffset.y = data.ViewOffset.y - io.MouseDelta.y / zoom
    end

    -- Display image
    local image_min = ImVec2(); local image_max = ImVec2()
    image_min.x = math.floor((canvas_min.x - (data.ViewOffset.x * zoom)) + (canvas_size.x * 0.5))
    image_min.y = math.floor((canvas_min.y - (data.ViewOffset.y * zoom)) + (canvas_size.y * 0.5))
    image_max.x = math.floor(image_min.x + image_w * zoom)
    image_max.y = math.floor(image_min.y + image_h * zoom)
    draw_list:AddRect(ImVec2(canvas_min.x - 1.0, canvas_min.y - 1.0), ImVec2(canvas_max.x + 1.0, canvas_max.y + 1.0), IM_COL32(255, 255, 255, 255))
    draw_list:PushClipRect(canvas_min, canvas_max, true)
    draw_list:AddRectFilled(image_min, image_max, data.ImageBgColor)
    if platform_io.DrawCallback_SetSamplerNearest ~= nil then
        draw_list:AddCallback(platform_io.DrawCallback_SetSamplerNearest)
    end
    draw_list:AddImage(image_tex_ref, image_min, image_max)
    if platform_io.DrawCallback_SetSamplerLinear ~= nil then
        draw_list:AddCallback(ImGui.GetPlatformIO().DrawCallback_SetSamplerLinear)
    end

    -- Display grid lines for visible pixels
    if data.GridEnabled and zoom > 6.0 then
        local step = zoom
        for px = math.floor((canvas_min.x - image_min.x) / step), math.floor((canvas_max.x - image_min.x) / step) do
            draw_list:AddLineV(image_min.x + px * step, canvas_min.y, canvas_max.y, data.GridColor, 1.0)
        end
        for py = math.floor((canvas_min.y - image_min.y) / step), math.floor((canvas_max.y - image_min.y) / step) do
            draw_list:AddLineH(canvas_min.x, canvas_max.x, image_min.y + py * step, data.GridColor, 1.0)
        end
    end
    draw_list:PopClipRect()
end

----------------------------------------------------------------
-- [SECTION] Demo Window / ShowDemoWindow()
----------------------------------------------------------------

local demo_data = ImGuiDemoWindowData()

local no_titlebar       = false
local no_scrollbar      = false
local no_menu           = false
local no_move           = false
local no_resize         = false
local no_collapse       = false
local no_close          = false
local no_nav            = false
local no_background     = false
local no_bring_to_front = false
local no_docking        = false
local unsaved_document  = false

--- Shows an example app: `if X then X.open = X(open) end`. Example apps return the new p_open.
local function RunApp(fn, key, ...)
    if fn then
        demo_data[key] = fn(demo_data[key], ...)
        if demo_data[key] == nil then demo_data[key] = false end
    else
        demo_data[key] = false
    end
end

local function DemoWindowMenuBar(data)
    if ImGui.BeginMenuBar() then
        if ImGui.BeginMenu("Menu") then
            IMGUI_DEMO_MARKER("Menu/File")
            ShowExampleMenuFile()
            ImGui.EndMenu()
        end
        if ImGui.BeginMenu("Examples") then
            IMGUI_DEMO_MARKER("Menu/Examples")
            _, data.ShowMainMenuBar = ImGui.MenuItem("Main menu bar", nil, data.ShowMainMenuBar)

            ImGui.SeparatorText("Mini apps")
            _, data.ShowAppAssetsBrowser = ImGui.MenuItem("Assets Browser", nil, data.ShowAppAssetsBrowser)
            _, data.ShowAppConsole = ImGui.MenuItem("Console", nil, data.ShowAppConsole)
            _, data.ShowAppCustomRendering = ImGui.MenuItem("Custom rendering", nil, data.ShowAppCustomRendering)
            _, data.ShowAppDocuments = ImGui.MenuItem("Documents", nil, data.ShowAppDocuments)
            _, data.ShowAppDockSpace = ImGui.MenuItem("Dockspace", nil, data.ShowAppDockSpace)
            _, data.ShowAppImageViewer = ImGui.MenuItem("Image Viewer", nil, data.ShowAppImageViewer)
            _, data.ShowAppLog = ImGui.MenuItem("Log", nil, data.ShowAppLog)
            _, data.ShowAppPropertyEditor = ImGui.MenuItem("Property editor", nil, data.ShowAppPropertyEditor)
            _, data.ShowAppLayout = ImGui.MenuItem("Simple layout", nil, data.ShowAppLayout)
            _, data.ShowAppSimpleOverlay = ImGui.MenuItem("Simple overlay", nil, data.ShowAppSimpleOverlay)

            ImGui.SeparatorText("Concepts")
            _, data.ShowAppAutoResize = ImGui.MenuItem("Auto-resizing window", nil, data.ShowAppAutoResize)
            _, data.ShowAppConstrainedResize = ImGui.MenuItem("Constrained-resizing window", nil, data.ShowAppConstrainedResize)
            _, data.ShowAppFullscreen = ImGui.MenuItem("Fullscreen window", nil, data.ShowAppFullscreen)
            _, data.ShowAppLongText = ImGui.MenuItem("Long text display", nil, data.ShowAppLongText)
            _, data.ShowAppWindowTitles = ImGui.MenuItem("Manipulating window titles", nil, data.ShowAppWindowTitles)

            ImGui.EndMenu()
        end
        if ImGui.BeginMenu("Tools") then
            IMGUI_DEMO_MARKER("Menu/Tools")
            local io = ImGui.GetIO()
            local has_debug_tools = not IMGUI_DISABLE_DEBUG_TOOLS
            _, data.ShowMetrics = ImGui.MenuItem("Metrics/Debugger", nil, data.ShowMetrics, has_debug_tools and ImGui.ShowMetricsWindow ~= nil)
            if ImGui.BeginMenu("Debug Options") then
                ImGui.BeginDisabled(not has_debug_tools)
                _, io.ConfigDebugHighlightIdConflicts = ImGui.Checkbox("Highlight ID Conflicts", io.ConfigDebugHighlightIdConflicts)
                ImGui.EndDisabled()
                _, io.ConfigErrorRecoveryEnableAssert = ImGui.Checkbox("Assert on error recovery", io.ConfigErrorRecoveryEnableAssert)
                ImGui.TextDisabled("(see Demo->Configuration for more)")
                ImGui.EndMenu()
            end
            _, data.ShowDebugLog = ImGui.MenuItem("Debug Log", nil, data.ShowDebugLog, has_debug_tools and ImGui.ShowDebugLogWindow ~= nil)
            _, data.ShowIDStackTool = ImGui.MenuItem("ID Stack Tool", nil, data.ShowIDStackTool, has_debug_tools and ImGui.ShowIDStackToolWindow ~= nil)
            local is_debugger_present = io.ConfigDebugIsDebuggerPresent
            if ImGui.MenuItem("Item Picker", nil, false, has_debug_tools and ImGui.DebugStartItemPicker ~= nil) then
                ImGui.DebugStartItemPicker()
            end
            if not is_debugger_present then
                ImGui.SetItemTooltip("Requires io.ConfigDebugIsDebuggerPresent=true to be set.\n\nWe otherwise disable some extra features to avoid casual users crashing the application.")
            end
            _, data.ShowStyleEditor = ImGui.MenuItem("Style Editor", nil, data.ShowStyleEditor)
            _, data.ShowAbout = ImGui.MenuItem("About ImGui Sincerely", nil, data.ShowAbout)

            ImGui.EndMenu()
        end
        ImGui.EndMenuBar()
    end
end

--- Configuration header contents (split from ShowDemoWindow to keep the function small)
local function DemoWindowConfiguration(io)
    local F = ImGuiConfigFlags
    local function CF(label, flag)
        local pressed
        pressed, io.ConfigFlags = ImGui.CheckboxFlags(label, io.ConfigFlags, flag)
        return pressed
    end
    local function CB(label, field)
        local pressed
        pressed, io[field] = ImGui.Checkbox(label, io[field])
        return pressed
    end
    local function HM(desc) ImGui.SameLine(); HelpMarker(desc) end

    if ImGui.TreeNode("Configuration##2") then
        IMGUI_DEMO_MARKER("Configuration")
        ImGui.SeparatorText("General")
        CF("io.ConfigFlags: NavEnableKeyboard", F.NavEnableKeyboard)
        HM("Enable keyboard controls.")
        CF("io.ConfigFlags: NavEnableGamepad", F.NavEnableGamepad)
        HM("Enable gamepad controls. Require backend to set io.BackendFlags |= ImGuiBackendFlags_HasGamepad.\n\nRead instructions in imgui.cpp for details.")
        CF("io.ConfigFlags: NoMouse", F.NoMouse)
        HM("Instruct dear imgui to disable mouse inputs and interactions.")

        -- The "NoMouse" option can get us stuck with a disabled mouse! Let's provide an alternative way to fix it:
        if DemoHas(io.ConfigFlags, F.NoMouse) then
            if (ImGui.GetTime() % 0.40) < 0.20 then
                ImGui.SameLine()
                ImGui.Text("<<PRESS SPACE TO DISABLE>>")
            end
            -- Prevent both being checked
            if ImGui.IsKeyPressed(ImGuiKey.Space) or DemoHas(io.ConfigFlags, F.NoKeyboard) then
                io.ConfigFlags = bit32.band(io.ConfigFlags, bit32.bnot(F.NoMouse))
            end
        end

        CF("io.ConfigFlags: NoMouseCursorChange", F.NoMouseCursorChange)
        HM("Instruct backend to not alter mouse cursor shape and visibility.")
        CF("io.ConfigFlags: NoKeyboard", F.NoKeyboard)
        HM("Instruct dear imgui to disable keyboard inputs and interactions.")

        CB("io.ConfigInputTrickleEventQueue", "ConfigInputTrickleEventQueue")
        HM("Enable input queue trickling: some types of events submitted during the same frame (e.g. button down + up) will be spread over multiple frames, improving interactions with low framerates.")
        CB("io.MouseDrawCursor", "MouseDrawCursor")
        HM("Instruct Dear ImGui to render a mouse cursor itself. Note that a mouse cursor rendered via your application GPU rendering path will feel more laggy than hardware cursor, but will be more in sync with your other visuals.\n\nSome desktop applications may use both kinds of cursors (e.g. enable software cursor only when resizing/dragging something).")

        ImGui.SeparatorText("Keyboard/Gamepad Navigation")
        CB("io.ConfigNavSwapGamepadButtons", "ConfigNavSwapGamepadButtons")
        CB("io.ConfigNavMoveSetMousePos", "ConfigNavMoveSetMousePos")
        HM("Directional/tabbing navigation teleports the mouse cursor. May be useful on TV/console systems where moving a virtual mouse is difficult")
        CB("io.ConfigNavCaptureKeyboard", "ConfigNavCaptureKeyboard")
        CB("io.ConfigNavEscapeClearFocusItem", "ConfigNavEscapeClearFocusItem")
        HM("Pressing Escape clears focused item.")
        CB("io.ConfigNavEscapeClearFocusWindow", "ConfigNavEscapeClearFocusWindow")
        HM("Pressing Escape clears focused window.")
        CB("io.ConfigNavCursorVisibleAuto", "ConfigNavCursorVisibleAuto")
        HM("Using directional navigation key makes the cursor visible. Mouse click hides the cursor.")
        CB("io.ConfigNavCursorVisibleAlways", "ConfigNavCursorVisibleAlways")
        HM("Navigation cursor is always visible.")

        ImGui.SeparatorText("Docking")
        CF("io.ConfigFlags: DockingEnable", F.DockingEnable)
        ImGui.SameLine()
        if io.ConfigDockingWithShift then
            HelpMarker("Drag from window title bar or their tab to dock/undock. Hold SHIFT to enable docking.\n\nDrag from window menu button (upper-left button) to undock an entire node (all windows).")
        else
            HelpMarker("Drag from window title bar or their tab to dock/undock. Hold SHIFT to disable docking.\n\nDrag from window menu button (upper-left button) to undock an entire node (all windows).")
        end
        if DemoHas(io.ConfigFlags, F.DockingEnable) then
            ImGui.Indent()
            CB("io.ConfigDockingNoSplit", "ConfigDockingNoSplit")
            HM("Simplified docking mode: disable window splitting, so docking is limited to merging multiple windows together into tab-bars.")
            CB("io.ConfigDockingNoDockingOver", "ConfigDockingNoDockingOver")
            HM("Simplified docking mode: disable window merging into a same tab-bar, so docking is limited to splitting windows.")
            CB("io.ConfigDockingWithShift", "ConfigDockingWithShift")
            HM("Enable docking when holding Shift only (allow to drop in wider space, reduce visual noise)")
            CB("io.ConfigDockingAlwaysTabBar", "ConfigDockingAlwaysTabBar")
            HM("Create a docking node and tab-bar on single floating windows.")
            CB("io.ConfigDockingTransparentPayload", "ConfigDockingTransparentPayload")
            HM("Make window or viewport transparent when docking and only display docking boxes on the target viewport. Useful if rendering of multiple viewport cannot be synced. Best used with ConfigViewportsNoAutoMerge.")
            ImGui.Unindent()
        end

        ImGui.SeparatorText("Multi-viewports")
        CF("io.ConfigFlags: ViewportsEnable", F.ViewportsEnable)
        HM("[beta] Enable beta multi-viewports support. See ImGuiPlatformIO for details.")
        if DemoHas(io.ConfigFlags, F.ViewportsEnable) then
            ImGui.Indent()
            DemoNotSupported()
            ImGui.Unindent()
        end

        ImGui.SeparatorText("Windows")
        CB("io.ConfigWindowsResizeFromEdges", "ConfigWindowsResizeFromEdges")
        HM("Enable resizing of windows from their edges and from the lower-left corner.\nThis requires ImGuiBackendFlags_HasMouseCursors for better mouse cursor feedback.")
        CB("io.ConfigWindowsMoveFromTitleBarOnly", "ConfigWindowsMoveFromTitleBarOnly")
        CB("io.ConfigWindowsCopyContentsWithCtrlC", "ConfigWindowsCopyContentsWithCtrlC") -- [EXPERIMENTAL]
        HM("*EXPERIMENTAL* Ctrl+C copy the contents of focused window into the clipboard.\n\nExperimental because:\n- (1) has known issues with nested Begin/End pairs.\n- (2) text output quality varies.\n- (3) text output is in submission order rather than spatial order.")
        CB("io.ConfigScrollbarScrollByPage", "ConfigScrollbarScrollByPage")
        HM("Enable scrolling page by page when clicking outside the scrollbar grab.\nWhen disabled, always scroll to clicked location.\nWhen enabled, Shift+Click scrolls to clicked location.")

        ImGui.SeparatorText("Widgets")
        CB("io.ConfigInputTextCursorBlink", "ConfigInputTextCursorBlink")
        HM("Enable blinking cursor (optional as some users consider it to be distracting).")
        CB("io.ConfigInputTextEnterKeepActive", "ConfigInputTextEnterKeepActive")
        HM("Pressing Enter will reactivate item and select all text (single-line only).")
        CB("io.ConfigDragClickToInputText", "ConfigDragClickToInputText")
        HM("Enable turning DragXXX widgets into text input with a simple mouse click-release (without moving).")
        CB("io.ConfigMacOSXBehaviors", "ConfigMacOSXBehaviors")
        HM("Swap Cmd<>Ctrl keys, enable various MacOS style behaviors.")
        ImGui.Text("Also see Style->Rendering for rendering options.")

        ImGui.SeparatorText("Settings")
        CB("io.ConfigIniSettingsSaveLastUsedDate", "ConfigIniSettingsSaveLastUsedDate")

        -- Also read: https://github.com/ocornut/imgui/wiki/Error-Handling
        ImGui.SeparatorText("Error Handling")

        CB("io.ConfigErrorRecovery", "ConfigErrorRecovery")
        HM(
            "Options to configure how we handle recoverable errors.\n" ..
            "- Error recovery is not perfect nor guaranteed! It is a feature to ease development.\n" ..
            "- You not are not supposed to rely on it in the course of a normal application run.\n" ..
            "- Possible usage: facilitate recovery from errors triggered from a scripting language or after specific exceptions handlers.\n" ..
            "- Always ensure that on programmers seat you have at minimum Asserts or Tooltips enabled when making direct imgui API call! " ..
            "Otherwise it would severely hinder your ability to catch and correct mistakes!")
        CB("io.ConfigErrorRecoveryEnableAssert", "ConfigErrorRecoveryEnableAssert")
        CB("io.ConfigErrorRecoveryEnableDebugLog", "ConfigErrorRecoveryEnableDebugLog")
        CB("io.ConfigErrorRecoveryEnableTooltip", "ConfigErrorRecoveryEnableTooltip")
        if not io.ConfigErrorRecoveryEnableAssert and not io.ConfigErrorRecoveryEnableDebugLog and not io.ConfigErrorRecoveryEnableTooltip then
            io.ConfigErrorRecoveryEnableAssert = true
            io.ConfigErrorRecoveryEnableDebugLog = true
            io.ConfigErrorRecoveryEnableTooltip = true
        end

        -- Also read: https://github.com/ocornut/imgui/wiki/Debug-Tools
        ImGui.SeparatorText("Debug")
        CB("io.ConfigDebugIsDebuggerPresent", "ConfigDebugIsDebuggerPresent")
        HM("Enable various tools calling IM_DEBUG_BREAK().\n\nRequires a debugger being attached, otherwise IM_DEBUG_BREAK() options will appear to crash your application.")
        CB("io.ConfigDebugHighlightIdConflicts", "ConfigDebugHighlightIdConflicts")
        HM("Highlight and show an error message when multiple items have conflicting identifiers.")
        ImGui.BeginDisabled()
        CB("io.ConfigDebugBeginReturnValueOnce", "ConfigDebugBeginReturnValueOnce")
        ImGui.EndDisabled()
        HM("First calls to Begin()/BeginChild() will return false.\n\nTHIS OPTION IS DISABLED because it needs to be set at application boot-time to make sense. Showing the disabled option is a way to make this feature easier to discover.")
        CB("io.ConfigDebugBeginReturnValueLoop", "ConfigDebugBeginReturnValueLoop")
        HM("Some calls to Begin()/BeginChild() will return false.\n\nWill cycle through window depths then repeat. Windows should be flickering while running.")
        CB("io.ConfigDebugIgnoreFocusLoss", "ConfigDebugIgnoreFocusLoss")
        HM("Option to deactivate io.AddFocusEvent(false) handling. May facilitate interactions with a debugger when focus loss leads to clearing inputs data.")
        CB("io.ConfigDebugDrawListDefaultsToStrokeLegacy", "ConfigDebugDrawListDefaultsToStrokeLegacy")
        HM("Option to default all ImDrawList to ImDrawFlags_StrokeLegacy mode, mimicking pre-1.93.0 rendering.")
        CB("io.ConfigDebugIniSettings", "ConfigDebugIniSettings")
        HM("Option to save .ini data with extra comments (particularly helpful for Docking, but makes saving slower).")

        ImGui.TreePop()
        ImGui.Spacing()
    end

    if ImGui.TreeNode("Backend Flags") then
        IMGUI_DEMO_MARKER("Configuration/Backend Flags")
        HelpMarker(
            "Those flags are set by the backends (imgui_impl_xxx files) to specify their capabilities.\n" ..
            "Here we expose them as read-only fields to avoid breaking interactions with your backend.")

        -- Make a local copy to avoid modifying actual backend flags.
        local B = ImGuiBackendFlags
        local backend_flags = io.BackendFlags
        ImGui.BeginDisabled()
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: HasGamepad", backend_flags, B.HasGamepad)
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: HasMouseCursors", backend_flags, B.HasMouseCursors)
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: HasSetMousePos", backend_flags, B.HasSetMousePos)
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: PlatformHasViewports", backend_flags, B.PlatformHasViewports)
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: HasMouseHoveredViewport", backend_flags, B.HasMouseHoveredViewport)
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: HasParentViewport", backend_flags, B.HasParentViewport)
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: RendererHasVtxOffset", backend_flags, B.RendererHasVtxOffset)
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: RendererHasTextures", backend_flags, B.RendererHasTextures)
        _, backend_flags = ImGui.CheckboxFlags("io.BackendFlags: RendererHasViewports", backend_flags, B.RendererHasViewports)
        ImGui.EndDisabled()

        ImGui.TreePop()
        ImGui.Spacing()
    end

    if ImGui.TreeNode("Style, Fonts") then
        IMGUI_DEMO_MARKER("Configuration/Style, Fonts")
        _, demo_data.ShowStyleEditor = ImGui.Checkbox("Style Editor", demo_data.ShowStyleEditor)
        ImGui.SameLine()
        HelpMarker("The same contents can be accessed in 'Tools->Style Editor' or by calling the ShowStyleEditor() function.")
        ImGui.TreePop()
        ImGui.Spacing()
    end

    if ImGui.TreeNode("Capture/Logging") then
        IMGUI_DEMO_MARKER("Configuration/Capture, Logging")
        HelpMarker(
            "The logging API redirects all text output so you can easily capture the content of " ..
            "a window or a block. Tree nodes can be automatically expanded.\n" ..
            "Try opening any of the contents below in this window and then click one of the \"Log To\" button.")
        if ImGui.LogButtons then
            ImGui.LogButtons()
        else
            DemoNotPorted("LogButtons")
        end

        HelpMarker("You can also call ImGui::LogText() to output directly to the log without a visual output.")
        if ImGui.Button("Copy \"Hello, world!\" to clipboard") then
            if ImGui.LogToClipboard then
                ImGui.LogToClipboard()
                ImGui.LogText("Hello, world!")
                ImGui.LogFinish()
            else
                ImGui.SetClipboardText("Hello, world!") -- internal clipboard only on Roblox
            end
        end
        ImGui.TreePop()
    end
end

--- Demonstrate most Dear ImGui features (this is big function!)
--- @param p_open? bool
--- @return bool? p_open
function ImGui.ShowDemoWindow(p_open)
    IM_ASSERT(ImGui.GetCurrentContext() ~= nil, "Missing Dear ImGui context. Refer to examples app!")

    local data = demo_data

    -- Examples Apps (accessible from the "Examples" menu)
    if data.ShowMainMenuBar then
        if ShowExampleAppMainMenuBar then ShowExampleAppMainMenuBar() end
    end
    if data.ShowAppDockSpace then RunApp(ShowExampleAppDockSpace, "ShowAppDockSpace") end -- Important: Process the Docking app first, as explicit DockSpace() nodes needs to be submitted early (read comments near the DockSpace function)
    if data.ShowAppDocuments then RunApp(ShowExampleAppDocuments, "ShowAppDocuments") end -- ...process the Document app next, as it may also use a DockSpace()
    if data.ShowAppAssetsBrowser then RunApp(ShowExampleAppAssetsBrowser, "ShowAppAssetsBrowser") end
    if data.ShowAppConsole then RunApp(ShowExampleAppConsole, "ShowAppConsole") end
    if data.ShowAppCustomRendering then RunApp(ShowExampleAppCustomRendering, "ShowAppCustomRendering") end
    if data.ShowAppImageViewer then RunApp(ShowExampleAppImageViewer, "ShowAppImageViewer") end
    if data.ShowAppLog then RunApp(ShowExampleAppLog, "ShowAppLog") end
    if data.ShowAppLayout then RunApp(ShowExampleAppLayout, "ShowAppLayout") end
    if data.ShowAppPropertyEditor then RunApp(ShowExampleAppPropertyEditor, "ShowAppPropertyEditor", data) end
    if data.ShowAppSimpleOverlay then RunApp(ShowExampleAppSimpleOverlay, "ShowAppSimpleOverlay") end
    if data.ShowAppAutoResize then RunApp(ShowExampleAppAutoResize, "ShowAppAutoResize") end
    if data.ShowAppConstrainedResize then RunApp(ShowExampleAppConstrainedResize, "ShowAppConstrainedResize") end
    if data.ShowAppFullscreen then RunApp(ShowExampleAppFullscreen, "ShowAppFullscreen") end
    if data.ShowAppLongText then RunApp(ShowExampleAppLongText, "ShowAppLongText") end
    if data.ShowAppWindowTitles then RunApp(ShowExampleAppWindowTitles, "ShowAppWindowTitles") end

    -- Dear ImGui Tools (accessible from the "Tools" menu)
    if data.ShowMetrics then RunApp(ImGui.ShowMetricsWindow, "ShowMetrics") end
    if data.ShowDebugLog then RunApp(ImGui.ShowDebugLogWindow, "ShowDebugLog") end
    if data.ShowIDStackTool then RunApp(ImGui.ShowIDStackToolWindow, "ShowIDStackTool") end
    if data.ShowAbout then RunApp(ImGui.ShowAboutWindow, "ShowAbout") end
    if data.ShowStyleEditor then
        local visible
        data.ShowStyleEditor, visible = ImGui.Begin("ImGui Sincerely Style Editor", data.ShowStyleEditor)
        if visible then
            ImGui.ShowStyleEditor()
        end
        ImGui.End()
    end

    -- Demonstrate the various window flags. Typically you would just use the default!
    local W = ImGuiWindowFlags
    local window_flags = 0
    if no_titlebar       then window_flags = bit32.bor(window_flags, W.NoTitleBar) end
    if no_scrollbar      then window_flags = bit32.bor(window_flags, W.NoScrollbar) end
    if not no_menu       then window_flags = bit32.bor(window_flags, W.MenuBar) end
    if no_move           then window_flags = bit32.bor(window_flags, W.NoMove) end
    if no_resize         then window_flags = bit32.bor(window_flags, W.NoResize) end
    if no_collapse       then window_flags = bit32.bor(window_flags, W.NoCollapse) end
    if no_nav            then window_flags = bit32.bor(window_flags, W.NoNav) end
    if no_background     then window_flags = bit32.bor(window_flags, W.NoBackground) end
    if no_bring_to_front then window_flags = bit32.bor(window_flags, W.NoBringToFrontOnFocus) end
    if no_docking        then window_flags = bit32.bor(window_flags, W.NoDocking) end
    if unsaved_document  then window_flags = bit32.bor(window_flags, W.UnsavedDocument) end
    if no_close          then p_open = nil end -- Don't pass our bool* to Begin

    -- We specify a default position/size in case there's no data in the .ini file.
    local main_viewport = ImGui.GetMainViewport()
    ImGui.SetNextWindowPos(ImVec2(main_viewport.WorkPos.x + 650, main_viewport.WorkPos.y + 20), ImGuiCond.FirstUseEver)
    ImGui.SetNextWindowSize(ImVec2(550, 680), ImGuiCond.FirstUseEver)

    -- Main body of the Demo window starts here.
    local visible
    p_open, visible = ImGui.Begin("ImGui Sincerely Demo", p_open, window_flags)
    if no_close then p_open = nil end
    if not visible then
        -- Early out if the window is collapsed, as an optimization.
        ImGui.End()
        return p_open
    end

    -- Most framed widgets share a common width settings. Remaining width is used for the label.
    local label_width_base = ImGui.GetFontSize() * 12                  -- Some amount of width for label, based on font size.
    local label_width_max = ImGui.GetContentRegionAvail().x * 0.40     -- ...but always leave some room for framed widgets.
    local label_width = math.min(label_width_base, label_width_max)
    ImGui.PushItemWidth(-label_width)                                  -- Right-align: framed items will leave 'label_width' available for the label.

    -- Menu Bar
    DemoWindowMenuBar(data)

    ImGui.Text("ImGui Sincerely says hello! (%s) (%d)", IMGUI_VERSION or "WIP", IMGUI_VERSION_NUM or 0)
    ImGui.Spacing()

    if ImGui.CollapsingHeader("Help") then
        IMGUI_DEMO_MARKER("Help")
        ImGui.SeparatorText("ABOUT THIS DEMO:")
        ImGui.BulletText("Sections below are demonstrating many aspects of the library.")
        ImGui.BulletText("The \"Examples\" menu above leads to more demo contents.")
        ImGui.BulletText("The \"Tools\" menu above gives access to: About Box, Style Editor,\n" ..
                         "and Metrics/Debugger (general purpose Dear ImGui debugging tool).")
        ImGui.BulletText("Web demo (w/ source code browser): ")
        ImGui.SameLine(0, 0)
        ImGui.TextLinkOpenURL("https://pthom.github.io/imgui_explorer")

        ImGui.SeparatorText("PROGRAMMER GUIDE:")
        ImGui.BulletText("See the ShowDemoWindow() code in imgui_demo.lua. <- you are here!")
        ImGui.BulletText("See comments in imgui.lua.")
        ImGui.BulletText("See example applications in the examples/ folder.")
        ImGui.BulletText("Read the FAQ at ")
        ImGui.SameLine(0, 0)
        ImGui.TextLinkOpenURL("https://www.dearimgui.com/faq/")
        ImGui.BulletText("Set 'io.ConfigFlags |= NavEnableKeyboard' for keyboard controls.")
        ImGui.BulletText("Set 'io.ConfigFlags |= NavEnableGamepad' for gamepad controls.")

        ImGui.SeparatorText("USER GUIDE:")
        ImGui.ShowUserGuide()
    end

    if ImGui.CollapsingHeader("Configuration") then
        DemoWindowConfiguration(ImGui.GetIO())
    end

    if ImGui.CollapsingHeader("Window options") then
        IMGUI_DEMO_MARKER("Window options")
        if ImGui.BeginTable("split", 3) then
            ImGui.TableNextColumn(); _, no_titlebar       = ImGui.Checkbox("No titlebar", no_titlebar)
            ImGui.TableNextColumn(); _, no_scrollbar      = ImGui.Checkbox("No scrollbar", no_scrollbar)
            ImGui.TableNextColumn(); _, no_menu           = ImGui.Checkbox("No menu", no_menu)
            ImGui.TableNextColumn(); _, no_move           = ImGui.Checkbox("No move", no_move)
            ImGui.TableNextColumn(); _, no_resize         = ImGui.Checkbox("No resize", no_resize)
            ImGui.TableNextColumn(); _, no_collapse       = ImGui.Checkbox("No collapse", no_collapse)
            ImGui.TableNextColumn(); _, no_close          = ImGui.Checkbox("No close", no_close)
            ImGui.TableNextColumn(); _, no_nav            = ImGui.Checkbox("No nav", no_nav)
            ImGui.TableNextColumn(); _, no_background     = ImGui.Checkbox("No background", no_background)
            ImGui.TableNextColumn(); _, no_bring_to_front = ImGui.Checkbox("No bring to front", no_bring_to_front)
            ImGui.TableNextColumn(); _, no_docking        = ImGui.Checkbox("No docking", no_docking)
            ImGui.TableNextColumn(); _, unsaved_document  = ImGui.Checkbox("Unsaved document", unsaved_document)
            ImGui.EndTable()
        end
    end

    -- All demo contents
    DemoWindowWidgets(data)
    if DemoWindowLayout then DemoWindowLayout() end
    if DemoWindowPopups then DemoWindowPopups() end
    if DemoWindowTables then DemoWindowTables() end
    if DemoWindowInputs then DemoWindowInputs() end

    -- End of ShowDemoWindow()
    ImGui.PopItemWidth()
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] DemoWindowWidgets()
----------------------------------------------------------------

--- Calls a (global) demo section if it exists, otherwise shows a placeholder
local function Sub(fn, title, ...)
    if fn then fn(...) else
        if ImGui.TreeNode(title) then DemoNotPorted(title) ImGui.TreePop() end
    end
end

function DemoWindowWidgets(data)
    if not ImGui.CollapsingHeader("Widgets") then
        return
    end
    -- IMGUI_DEMO_MARKER("Widgets")

    local disable_all = data.DisableSections -- The Checkbox for that is inside the "Disabled" section at the bottom
    local override_liveedit = data.LiveEditOverride
    if disable_all then
        ImGui.BeginDisabled()
    end
    if override_liveedit then
        ImGui.PushItemFlag(ImGuiItemFlags.LiveEditOnInputText, DemoHas(data.LiveEditFlags, ImGuiItemFlags.LiveEditOnInputText))
        ImGui.PushItemFlag(ImGuiItemFlags.LiveEditOnInputScalar, DemoHas(data.LiveEditFlags, ImGuiItemFlags.LiveEditOnInputScalar))
    end

    Sub(DemoWindowWidgetsBasic, "Basic")
    Sub(DemoWindowWidgetsBullets, "Bullets")
    Sub(DemoWindowWidgetsCollapsingHeaders, "Collapsing Headers")
    Sub(DemoWindowWidgetsComboBoxes, "Combo")
    Sub(DemoWindowWidgetsColorAndPickers, "Color/Picker Widgets")
    Sub(DemoWindowWidgetsDataTypes, "Data Types")

    if disable_all then
        ImGui.EndDisabled()
    end
    Sub(DemoWindowWidgetsDisableBlocks, "Disable Blocks", data)
    if disable_all then
        ImGui.BeginDisabled()
    end

    Sub(DemoWindowWidgetsDragAndDrop, "Drag and Drop")
    Sub(DemoWindowWidgetsDragsAndSliders, "Drag/Slider Flags")
    Sub(DemoWindowWidgetsFonts, "Fonts")
    Sub(DemoWindowWidgetsImages, "Images")
    Sub(DemoWindowWidgetsListBoxes, "List Boxes")
    Sub(DemoWindowWidgetsLiveEdit, "Live Edit Flags", data)
    Sub(DemoWindowWidgetsMixedValues, "Mixed Values")
    Sub(DemoWindowWidgetsMultiComponents, "Multi-component Widgets")
    Sub(DemoWindowWidgetsPlotting, "Plotting")
    Sub(DemoWindowWidgetsProgressBars, "Progress Bars")
    Sub(DemoWindowWidgetsQueryingStatuses, "Querying Item Status (Edited/Active/Hovered etc.)")
    Sub(DemoWindowWidgetsSelectables, "Selectables")
    Sub(DemoWindowWidgetsSelectionAndMultiSelect, "Selection State & Multi-Select", data)
    Sub(DemoWindowWidgetsTabs, "Tabs")
    Sub(DemoWindowWidgetsText, "Text")
    Sub(DemoWindowWidgetsTextFilter, "Text Filter")
    Sub(DemoWindowWidgetsTextInput, "Text Input")
    Sub(DemoWindowWidgetsTooltips, "Tooltips")
    Sub(DemoWindowWidgetsTreeNodes, "Tree Nodes")
    Sub(DemoWindowWidgetsVerticalSliders, "Vertical Sliders")

    if override_liveedit then
        ImGui.PopItemFlag()
        ImGui.PopItemFlag()
    end
    if disable_all then
        ImGui.EndDisabled()
    end
end

----------------------------------------------------------------
-- [SECTION] User Guide / ShowUserGuide()
----------------------------------------------------------------

function ImGui.ShowUserGuide()
    local io = ImGui.GetIO()
    ImGui.BulletText("Double-click on title bar to collapse window.")
    ImGui.BulletText(
        "Click and drag on lower corner or border to resize window.\n" ..
        "(double-click to auto fit window to its contents)")
    ImGui.BulletText("Ctrl+Click on a slider or drag box to input value as text.")
    ImGui.BulletText("Tab/Shift+Tab to cycle through keyboard editable fields.")
    ImGui.BulletText("Ctrl+Tab/Ctrl+Shift+Tab to focus windows.")
    if io.FontAllowUserScaling then
        ImGui.BulletText("Ctrl+Mouse Wheel to zoom window contents.")
    end
    ImGui.BulletText("While inputting text:\n")
    ImGui.Indent()
    ImGui.BulletText("Ctrl+Left/Right to word jump.")
    ImGui.BulletText("Ctrl+A or double-click to select all.")
    ImGui.BulletText("Ctrl+X/C/V to use clipboard cut/copy/paste.")
    ImGui.BulletText("Ctrl+Z to undo, Ctrl+Y/Ctrl+Shift+Z to redo.")
    ImGui.BulletText("Escape to revert.")
    ImGui.Unindent()
    ImGui.BulletText("With Keyboard controls enabled:")
    ImGui.Indent()
    ImGui.BulletText("Arrow keys or Home/End/PageUp/PageDown to navigate.")
    ImGui.BulletText("Space to activate a widget.")
    ImGui.BulletText("Return to input text into a widget.")
    ImGui.BulletText("Escape to deactivate a widget, close popup,\nexit a child window or the menu layer, clear focus.")
    ImGui.BulletText("Alt to jump to the menu layer of a window.")
    ImGui.BulletText("Menu or Shift+F10 to open a context menu.")
    ImGui.Unindent()
    ImGui.BulletText("With Gamepad controls enabled:")
    ImGui.Indent()
    ImGui.BulletText("D-Pad: Navigate / Tweak / Resize (in Windowing mode).")
    ImGui.BulletText("%s Face button: Activate / Open / Toggle. Hold: activate with text input.", io.ConfigNavSwapGamepadButtons and "East" or "South")
    ImGui.BulletText("%s Face button: Cancel / Close / Exit.", io.ConfigNavSwapGamepadButtons and "South" or "East")
    ImGui.BulletText("West Face button: Toggle Menu. Hold for Windowing mode (Focus/Move/Resize windows).")
    ImGui.BulletText("North Face button: Open Context Menu.")
    ImGui.BulletText("L1/R1: Tweak Slower/Faster, Focus Previous/Next (in Windowing Mode).")
    ImGui.Unindent()
end

return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imgui_demo_2.lua'] = function()
--- ImGui Sincerely WIP
-- (Demo Code, part 2): DemoWindowLayout(), DemoWindowPopups(), DemoWindowTables(), DemoWindowColumns(),
-- DemoWindowInputs() and all ShowExampleAppXXX() example apps.
-- Port of imgui_demo.cpp (docking branch). Globals are shared with imgui_demo.lua (HelpMarker, ShowExampleMenuFile, ...)

local IM_MIN = math.min
local IM_MAX = math.max
local function IM_CLAMP(V, MN, MX) return (V < MN) and MN or (V > MX) and MX or V end
local _
local function IMGUI_DEMO_MARKER(_) end -- upstream hook, no-op here

--- `char buf[size] = "str"` -> zero-terminated byte table
local function Buf(str, size)
    local t = {}
    for i = 1, #str do t[i] = string.byte(str, i) end
    t[#str + 1] = 0
    if size then for i = #str + 2, size do t[i] = 0 end end
    return t
end
--- byte table -> Lua string (up to the zero terminator)
local function BufStr(buf)
    local n = 0
    while buf[n + 1] ~= nil and buf[n + 1] ~= 0 do n = n + 1 end
    return ImGui._ByteArrayToString(buf, 1, n + 1)
end
local function BufSet(buf, str)
    for i = 1, #str do buf[i] = string.byte(str, i) end
    buf[#str + 1] = 0
end

--- ImColor::HSV() as ImVec4
local function HSV(h, s, v, a)
    local r, g, b = ImGui.ColorConvertHSVtoRGB(h, s, v)
    return ImVec4(r, g, b, a or 1.0)
end
local function B2I(b) return b and 1 or 0 end

local function Has(flags, f) return bit32.band(flags, f) ~= 0 end
local function NotSupported() ImGui.TextDisabled("(not supported on Roblox)") end
local function NotPorted(what) ImGui.TextDisabled("(not ported yet%s)", what and (": " .. what) or "") end

local function DemoHelpMarker(desc)
    if HelpMarker then HelpMarker(desc) return end
    ImGui.TextDisabled("(?)")
    if ImGui.BeginItemTooltip() then
        ImGui.PushTextWrapPos(ImGui.GetFontSize() * 35.0)
        ImGui.TextUnformatted(desc)
        ImGui.PopTextWrapPos()
        ImGui.EndTooltip()
    end
end
local function DemoMenuFile() if ShowExampleMenuFile then ShowExampleMenuFile() end end

--- Minimal ImGuiTextFilter stand-in when the library one isn't available
local function MakeTextFilter()
    if ImGuiTextFilter then return ImGuiTextFilter() end
    local f = { InputBuf = Buf("", 256) }
    function f:Draw(label, width)
        if width and width ~= 0 then ImGui.SetNextItemWidth(width) end
        return ImGui.InputText(label or "Filter (inc,-exc)", self.InputBuf, 256)
    end
    function f:IsActive() return self.InputBuf[1] ~= 0 end
    function f:Clear() self.InputBuf[1] = 0 end
    function f:Build() end
    function f:PassFilter(text, text_end)
        if text_end then text = string.sub(text, 1, text_end - 1) end
        local s = BufStr(self.InputBuf)
        if s == "" then return true end
        local any_inc, pass_inc = false, false
        for tok in string.gmatch(s, "[^,]+") do
            tok = string.match(tok, "^%s*(.-)%s*$")
            if tok ~= "" then
                if string.sub(tok, 1, 1) == "-" then
                    if #tok > 1 and string.find(string.lower(text), string.lower(string.sub(tok, 2)), 1, true) then return false end
                else
                    any_inc = true
                    if string.find(string.lower(text), string.lower(tok), 1, true) then pass_inc = true end
                end
            end
        end
        return (not any_inc) or pass_inc
    end
    return f
end

-- ImGuiInputTextCallbackData helpers (the port's callback data has no methods). Buf is a 1-based zero-terminated
-- byte table, positions are 0-based like C++.
local function CB_DeleteChars(data, pos, bytes_count)
    local buf = data.Buf
    local len = data.BufTextLen
    for i = pos + 1, len - bytes_count + 1 do buf[i] = buf[i + bytes_count] end
    for i = len - bytes_count + 2, len + 1 do buf[i] = 0 end
    if data.CursorPos >= pos + bytes_count then data.CursorPos = data.CursorPos - bytes_count
    elseif data.CursorPos >= pos then data.CursorPos = pos end
    data.SelectionStart = data.CursorPos; data.SelectionEnd = data.CursorPos
    data.BufDirty = true
    data.BufTextLen = len - bytes_count
end
local function CB_InsertChars(data, pos, text)
    local n = #text
    if n == 0 then return end
    if data.BufTextLen + n >= data.BufSize then return end
    local buf = data.Buf
    for i = data.BufTextLen + 1, pos + 1, -1 do buf[i + n] = buf[i] end
    for i = 1, n do buf[pos + i] = string.byte(text, i) end
    if data.CursorPos >= pos then data.CursorPos = data.CursorPos + n end
    data.SelectionStart = data.CursorPos; data.SelectionEnd = data.CursorPos
    data.BufDirty = true
    data.BufTextLen = data.BufTextLen + n
end
local function CB_SelectAll(data) data.SelectionStart = 0; data.SelectionEnd = data.BufTextLen end

--- ImGui::BeginChild() wrapper accepting upstream args
local function BeginChild(id, size, child_flags, window_flags)
    return ImGui.BeginChild(id, size or ImVec2(0, 0), child_flags or 0, window_flags or 0)
end

-------------------------------------------------------------------------------
-- [SECTION] DemoWindowLayout()
-------------------------------------------------------------------------------

local SL = {
    disable_mouse_wheel = false, disable_menu = false,
    draw_lines = 3, max_height_in_lines = 10,
    offset_x = 0, override_bg_color = true, child_flags = nil,
    f = 0.0, show_indented_items = true,
    c1 = false, c2 = false, c3 = false, c4 = false,
    f0 = 1.0, f1 = 2.0, f2 = 3.0, item = -1, selection = { 0, 1, 2, 3 },
    track_item = 50, enable_track = true, enable_extra_decorations = false, scroll_to_off_px = 0.0, scroll_to_pos_px = 200.0,
    lines = 7, show_horizontal_contents_size_demo_window = false,
    show_h_scrollbar = true, show_button = true, show_tree_nodes = true, show_text_wrapped = false, show_columns = true,
    show_tab_bar = true, show_child = false, explicit_content_size = false, contents_size_x = 300.0,
    clip_size = nil, clip_offset = nil,
    enable_allow_overlap = true,
}

local function DemoWindowLayout_ChildWindows()
    IMGUI_DEMO_MARKER("Layout/Child windows")
    ImGui.SeparatorText("Child windows")

    DemoHelpMarker("Use child windows to begin into a self-contained independent scrolling/clipping regions within a host window.")
    _, SL.disable_mouse_wheel = ImGui.Checkbox("Disable Mouse Wheel", SL.disable_mouse_wheel)
    _, SL.disable_menu = ImGui.Checkbox("Disable Menu", SL.disable_menu)

    -- Child 1: no border, enable horizontal scrollbar
    do
        local window_flags = ImGuiWindowFlags.HorizontalScrollbar
        if SL.disable_mouse_wheel then
            window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoScrollWithMouse)
        end
        BeginChild("ChildL", ImVec2(ImGui.GetContentRegionAvail().x * 0.5, 260), ImGuiChildFlags.None, window_flags)
        for i = 0, 99 do
            ImGui.Text("%04d: scrollable region", i)
        end
        ImGui.EndChild()
    end

    ImGui.SameLine()

    -- Child 2: rounded border
    do
        local window_flags = ImGuiWindowFlags.None
        if SL.disable_mouse_wheel then
            window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoScrollWithMouse)
        end
        if not SL.disable_menu then
            window_flags = bit32.bor(window_flags, ImGuiWindowFlags.MenuBar)
        end
        ImGui.PushStyleVar(ImGuiStyleVar.ChildRounding, 5.0)
        BeginChild("ChildR", ImVec2(0, 260), ImGuiChildFlags.Borders, window_flags)
        if not SL.disable_menu and ImGui.BeginMenuBar() then
            if ImGui.BeginMenu("Menu") then
                DemoMenuFile()
                ImGui.EndMenu()
            end
            ImGui.EndMenuBar()
        end
        if ImGui.BeginTable("split", 2, bit32.bor(ImGuiTableFlags.Resizable, ImGuiTableFlags.NoSavedSettings)) then
            for i = 0, 99 do
                local buf = string.format("%03d", i)
                ImGui.TableNextColumn()
                ImGui.Button(buf, ImVec2(-FLT_MIN, 0.0))
            end
            ImGui.EndTable()
        end
        ImGui.EndChild()
        ImGui.PopStyleVar()
    end

    -- Child 3: manual-resize
    ImGui.SeparatorText("Manual-resize")
    do
        DemoHelpMarker("Drag bottom border to resize. Double-click bottom border to auto-fit to vertical contents.")
        ImGui.PushStyleColor(ImGuiCol.ChildBg, ImGui.GetStyleColorVec4(ImGuiCol.FrameBg))
        if BeginChild("ResizableChild", ImVec2(-FLT_MIN, ImGui.GetTextLineHeightWithSpacing() * 8), bit32.bor(ImGuiChildFlags.Borders, ImGuiChildFlags.ResizeY)) then
            for n = 0, 9 do
                ImGui.Text("Line %04d", n)
            end
        end
        ImGui.PopStyleColor()
        ImGui.EndChild()
    end

    -- Child 4: auto-resizing height with a limit
    ImGui.SeparatorText("Auto-resize with constraints")
    do
        ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
        SL.draw_lines = ImGui.DragInt("Lines Count", SL.draw_lines, 0.2)
        ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
        SL.max_height_in_lines = ImGui.DragInt("Max Height (in Lines)", SL.max_height_in_lines, 0.2)

        ImGui.SetNextWindowSizeConstraints(ImVec2(0.0, ImGui.GetTextLineHeightWithSpacing() * 1), ImVec2(FLT_MAX, ImGui.GetTextLineHeightWithSpacing() * SL.max_height_in_lines))
        if BeginChild("ConstrainedChild", ImVec2(-FLT_MIN, 0.0), bit32.bor(ImGuiChildFlags.Borders, ImGuiChildFlags.AutoResizeY)) then
            for n = 0, SL.draw_lines - 1 do
                ImGui.Text("Line %04d", n)
            end
        end
        ImGui.EndChild()
    end

    ImGui.SeparatorText("Misc/Advanced")

    do
        if SL.child_flags == nil then SL.child_flags = bit32.bor(ImGuiChildFlags.Borders, ImGuiChildFlags.ResizeX, ImGuiChildFlags.ResizeY) end
        ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
        SL.offset_x = ImGui.DragInt("Offset X", SL.offset_x, 1.0, -1000, 1000)
        _, SL.override_bg_color = ImGui.Checkbox("Override ChildBg color", SL.override_bg_color)
        _, SL.child_flags = ImGui.CheckboxFlags("ImGuiChildFlags_Borders", SL.child_flags, ImGuiChildFlags.Borders)
        _, SL.child_flags = ImGui.CheckboxFlags("ImGuiChildFlags_AlwaysUseWindowPadding", SL.child_flags, ImGuiChildFlags.AlwaysUseWindowPadding)
        _, SL.child_flags = ImGui.CheckboxFlags("ImGuiChildFlags_ResizeX", SL.child_flags, ImGuiChildFlags.ResizeX)
        _, SL.child_flags = ImGui.CheckboxFlags("ImGuiChildFlags_ResizeY", SL.child_flags, ImGuiChildFlags.ResizeY)
        _, SL.child_flags = ImGui.CheckboxFlags("ImGuiChildFlags_FrameStyle", SL.child_flags, ImGuiChildFlags.FrameStyle)
        ImGui.SameLine(); DemoHelpMarker("Style the child window like a framed item: use FrameBg, FrameRounding, FrameBorderSize, FramePadding instead of ChildBg, ChildRounding, ChildBorderSize, WindowPadding.")
        if Has(SL.child_flags, ImGuiChildFlags.FrameStyle) then
            SL.override_bg_color = false
        end

        ImGui.SetCursorPosX(ImGui.GetCursorPosX() + SL.offset_x)
        if SL.override_bg_color then
            ImGui.PushStyleColor(ImGuiCol.ChildBg, IM_COL32(255, 0, 0, 100))
        end
        BeginChild("Red", ImVec2(200, 100), SL.child_flags, ImGuiWindowFlags.None)
        if SL.override_bg_color then
            ImGui.PopStyleColor()
        end

        for n = 0, 49 do
            ImGui.Text("Some test %d", n)
        end
        ImGui.EndChild()
        local child_is_hovered = ImGui.IsItemHovered()
        local child_rect_min = ImGui.GetItemRectMin()
        local child_rect_max = ImGui.GetItemRectMax()
        ImGui.Text("Hovered: %d", B2I(child_is_hovered))
        ImGui.Text("Rect of child window is: (%.0f,%.0f) (%.0f,%.0f)", child_rect_min.x, child_rect_min.y, child_rect_max.x, child_rect_max.y)
    end
end

local function DemoWindowLayout_WidgetsWidth()
    IMGUI_DEMO_MARKER("Layout/Widgets Width")
    _, SL.show_indented_items = ImGui.Checkbox("Show indented items", SL.show_indented_items)

    local function block(text, help, width, l1, l2)
        ImGui.Text(text)
        if help then ImGui.SameLine(); DemoHelpMarker(help) end
        ImGui.PushItemWidth(width)
        SL.f = ImGui.DragFloat(l1, SL.f)
        if SL.show_indented_items then
            ImGui.Indent()
            SL.f = ImGui.DragFloat(l2, SL.f)
            ImGui.Unindent()
        end
        ImGui.PopItemWidth()
    end
    block("SetNextItemWidth/PushItemWidth(100)", "Fixed width.", 100, "float##1b", "float (indented)##1b")
    block("SetNextItemWidth/PushItemWidth(-100)", "Align to right edge minus 100", -100, "float##2a", "float (indented)##2b")
    block("SetNextItemWidth/PushItemWidth(GetContentRegionAvail().x * 0.5f)", "Half of available width.\n(~ right-cursor_pos)\n(works within a column set)", ImGui.GetContentRegionAvail().x * 0.5, "float##3a", "float (indented)##3b")
    block("SetNextItemWidth/PushItemWidth(-GetContentRegionAvail().x * 0.5f)", "Align to right edge minus half", -ImGui.GetContentRegionAvail().x * 0.5, "float##4a", "float (indented)##4b")
    block("SetNextItemWidth/PushItemWidth(-Min(GetContentRegionAvail().x * 0.40f, GetFontSize() * 12))", nil, -IM_MIN(ImGui.GetFontSize() * 12, ImGui.GetContentRegionAvail().x * 0.40), "float##5a", "float (indented)##5b")
    -- Demonstrate using PushItemWidth to surround three items.
    block("SetNextItemWidth/PushItemWidth(-FLT_MIN)", "Align to right edge", -FLT_MIN, "##float6a", "float (indented)##6b")
end

local function DemoWindowLayout_BasicHorizontal()
    IMGUI_DEMO_MARKER("Layout/Basic Horizontal Layout")
    ImGui.TextWrapped("(Use ImGui::SameLine() to keep adding items to the right of the preceding item)")

    -- Text
    IMGUI_DEMO_MARKER("Layout/Basic Horizontal Layout/SameLine")
    ImGui.Text("Two items: Hello"); ImGui.SameLine()
    ImGui.TextColored(ImVec4(1, 1, 0, 1), "Sailor")

    -- Adjust spacing
    ImGui.Text("More spacing: Hello"); ImGui.SameLine(0, 20)
    ImGui.TextColored(ImVec4(1, 1, 0, 1), "Sailor")

    -- Button
    ImGui.AlignTextToFramePadding()
    ImGui.Text("Normal buttons"); ImGui.SameLine()
    ImGui.Button("Banana"); ImGui.SameLine()
    ImGui.Button("Apple"); ImGui.SameLine()
    ImGui.Button("Corniflower")

    -- Button
    ImGui.Text("Small buttons"); ImGui.SameLine()
    ImGui.SmallButton("Like this one"); ImGui.SameLine()
    ImGui.Text("can fit within a text block.")

    -- Aligned to arbitrary position. Easy/cheap column.
    IMGUI_DEMO_MARKER("Layout/Basic Horizontal Layout/SameLine (with offset)")
    ImGui.Text("Aligned")
    ImGui.SameLine(150); ImGui.Text("x=150")
    ImGui.SameLine(300); ImGui.Text("x=300")
    ImGui.Text("Aligned")
    ImGui.SameLine(150); ImGui.SmallButton("x=150")
    ImGui.SameLine(300); ImGui.SmallButton("x=300")

    -- Checkbox
    IMGUI_DEMO_MARKER("Layout/Basic Horizontal Layout/SameLine (more)")
    _, SL.c1 = ImGui.Checkbox("My", SL.c1); ImGui.SameLine()
    _, SL.c2 = ImGui.Checkbox("Tailor", SL.c2); ImGui.SameLine()
    _, SL.c3 = ImGui.Checkbox("Is", SL.c3); ImGui.SameLine()
    _, SL.c4 = ImGui.Checkbox("Rich", SL.c4)

    -- Various
    ImGui.PushItemWidth(ImGui.CalcTextSize("AAAAAAA").x)
    local items = { "AAAA", "BBBB", "CCCC", "DDDD" }
    if ImGui.Combo then
        SL.item = ImGui.Combo("Combo", SL.item, items, #items)
    else
        NotPorted("Combo")
    end
    ImGui.SameLine()
    SL.f0 = ImGui.SliderFloat("X", SL.f0, 0.0, 5.0); ImGui.SameLine()
    SL.f1 = ImGui.SliderFloat("Y", SL.f1, 0.0, 5.0); ImGui.SameLine()
    SL.f2 = ImGui.SliderFloat("Z", SL.f2, 0.0, 5.0)

    ImGui.Text("Lists:")
    for i = 1, 4 do
        if i > 1 then ImGui.SameLine() end
        ImGui.PushID(i - 1)
        if ImGui.ListBox then
            SL.selection[i] = ImGui.ListBox("", SL.selection[i], items, #items)
        else
            NotPorted("ListBox")
        end
        ImGui.PopID()
    end
    ImGui.PopItemWidth()

    -- Dummy
    IMGUI_DEMO_MARKER("Layout/Basic Horizontal Layout/Dummy")
    local button_sz = ImVec2(40, 40)
    ImGui.Button("A", button_sz); ImGui.SameLine()
    ImGui.Dummy(button_sz); ImGui.SameLine()
    ImGui.Button("B", button_sz)

    -- Manually wrapping
    IMGUI_DEMO_MARKER("Layout/Basic Horizontal Layout/Manual wrapping")
    ImGui.Text("Manual wrapping:")
    local style = ImGui.GetStyle()
    local buttons_count = 20
    local window_visible_x2 = ImGui.GetCursorScreenPos().x + ImGui.GetContentRegionAvail().x
    for n = 0, buttons_count - 1 do
        ImGui.PushID(n)
        ImGui.Button("Box", button_sz)
        local last_button_x2 = ImGui.GetItemRectMax().x
        local next_button_x2 = last_button_x2 + style.ItemSpacing.x + button_sz.x -- Expected position if next button was on same line
        if n + 1 < buttons_count and next_button_x2 < window_visible_x2 then
            ImGui.SameLine()
        end
        ImGui.PopID()
    end
end

local function DemoWindowLayout_Groups()
    IMGUI_DEMO_MARKER("Layout/Groups")
    DemoHelpMarker(
        "BeginGroup() basically locks the horizontal position for new line. " ..
        "EndGroup() bundles the whole group so that you can use \"item\" functions such as " ..
        "IsItemHovered()/IsItemActive() or SameLine() etc. on the whole group.")
    ImGui.BeginGroup()
    do
        ImGui.BeginGroup()
        ImGui.Button("AAA")
        ImGui.SameLine()
        ImGui.Button("BBB")
        ImGui.SameLine()
        ImGui.BeginGroup()
        ImGui.Button("CCC")
        ImGui.Button("DDD")
        ImGui.EndGroup()
        ImGui.SameLine()
        ImGui.Button("EEE")
        ImGui.EndGroup()
        ImGui.SetItemTooltip("First group hovered")
    end
    -- Capture the group size and create widgets using the same size
    local size = ImGui.GetItemRectSize()
    local values = { 0.5, 0.20, 0.80, 0.60, 0.25 }
    ImGui.PlotHistogram("##values", values, nil, #values, 0, nil, 0.0, 1.0, size)

    ImGui.Button("ACTION", ImVec2((size.x - ImGui.GetStyle().ItemSpacing.x) * 0.5, size.y))
    ImGui.SameLine()
    ImGui.Button("REACTION", ImVec2((size.x - ImGui.GetStyle().ItemSpacing.x) * 0.5, size.y))
    ImGui.EndGroup()
    ImGui.SameLine()

    ImGui.Button("LEVERAGE\nBUZZWORD", size)
    ImGui.SameLine()

    if ImGui.BeginListBox and ImGui.BeginListBox("List", size) then
        ImGui.Selectable("Selected", true)
        ImGui.Selectable("Not Selected", false)
        ImGui.EndListBox()
    end
end

local function DemoWindowLayout_TextBaseline()
    IMGUI_DEMO_MARKER("Layout/Text Baseline Alignment")
    do
        ImGui.BulletText("Text baseline:")
        ImGui.SameLine(); DemoHelpMarker(
            "This is testing the vertical alignment that gets applied on text to keep it aligned with widgets. " ..
            "Lines only composed of text or \"small\" widgets use less vertical space than lines with framed widgets.")
        ImGui.Indent()

        ImGui.Text("KO Blahblah"); ImGui.SameLine()
        ImGui.Button("Some framed item"); ImGui.SameLine()
        DemoHelpMarker("Baseline of button will look misaligned with text..")

        ImGui.AlignTextToFramePadding()
        ImGui.Text("OK Blahblah"); ImGui.SameLine()
        ImGui.Button("Some framed item##2"); ImGui.SameLine()
        DemoHelpMarker("We call AlignTextToFramePadding() to vertically align the text baseline by +FramePadding.y")

        -- SmallButton() uses the same vertical padding as Text
        ImGui.Button("TEST##1"); ImGui.SameLine()
        ImGui.Text("TEST"); ImGui.SameLine()
        ImGui.SmallButton("TEST##2")

        ImGui.AlignTextToFramePadding()
        ImGui.Text("Text aligned to framed item"); ImGui.SameLine()
        ImGui.Button("Item##1"); ImGui.SameLine()
        ImGui.Text("Item"); ImGui.SameLine()
        ImGui.SmallButton("Item##2"); ImGui.SameLine()
        ImGui.Button("Item##3")

        ImGui.Unindent()
    end

    ImGui.Spacing()

    do
        ImGui.BulletText("Multi-line text:")
        ImGui.Indent()
        ImGui.Text("One\nTwo\nThree"); ImGui.SameLine()
        ImGui.Text("Hello\nWorld"); ImGui.SameLine()
        ImGui.Text("Banana")

        ImGui.Text("Banana"); ImGui.SameLine()
        ImGui.Text("Hello\nWorld"); ImGui.SameLine()
        ImGui.Text("One\nTwo\nThree")

        ImGui.Button("HOP##1"); ImGui.SameLine()
        ImGui.Text("Banana"); ImGui.SameLine()
        ImGui.Text("Hello\nWorld"); ImGui.SameLine()
        ImGui.Text("Banana")

        ImGui.Button("HOP##2"); ImGui.SameLine()
        ImGui.Text("Hello\nWorld"); ImGui.SameLine()
        ImGui.Text("Banana")
        ImGui.Unindent()
    end

    ImGui.Spacing()

    do
        ImGui.BulletText("Misc items:")
        ImGui.Indent()

        ImGui.Button("80x80", ImVec2(80, 80))
        ImGui.SameLine()
        ImGui.Button("50x50", ImVec2(50, 50))
        ImGui.SameLine()
        ImGui.Button("Button()")
        ImGui.SameLine()
        ImGui.SmallButton("SmallButton()")

        -- Tree
        local spacing = ImGui.GetStyle().ItemInnerSpacing.x
        ImGui.Button("Button##1") -- Will make line higher
        ImGui.SameLine(0.0, spacing)
        if ImGui.TreeNodeEx("Node##1", ImGuiTreeNodeFlags.DrawLinesNone) then
            for i = 0, 5 do
                ImGui.BulletText("Item %d..", i)
            end
            ImGui.TreePop()
        end

        local padding = math.floor(ImGui.GetFontSize() * 1.20) -- Large padding
        ImGui.PushStyleVarY(ImGuiStyleVar.FramePadding, padding)
        ImGui.Button("Button##2")
        ImGui.PopStyleVar()
        ImGui.SameLine(0.0, spacing)
        if ImGui.TreeNodeEx("Node##2", ImGuiTreeNodeFlags.DrawLinesNone) then
            ImGui.TreePop()
        end

        ImGui.AlignTextToFramePadding()

        local node_open = ImGui.TreeNode("Node##3")
        ImGui.SameLine(0.0, spacing); ImGui.Button("Button##3")
        if node_open then
            for i = 0, 5 do
                ImGui.BulletText("Item %d..", i)
            end
            ImGui.TreePop()
        end

        -- Bullet
        ImGui.Button("Button##4")
        ImGui.SameLine(0.0, spacing)
        ImGui.BulletText("Bullet text")

        ImGui.AlignTextToFramePadding()
        ImGui.BulletText("Node")
        ImGui.SameLine(0.0, spacing); ImGui.Button("Button##5")
        ImGui.Unindent()
    end
end

local function DemoWindowLayout_HorizontalContentsSizeWindow()
    if SL.explicit_content_size then
        ImGui.SetNextWindowContentSize(ImVec2(SL.contents_size_x, 0.0))
    end
    SL.show_horizontal_contents_size_demo_window = ImGui.Begin("Horizontal contents size demo window", SL.show_horizontal_contents_size_demo_window, SL.show_h_scrollbar and ImGuiWindowFlags.HorizontalScrollbar or 0)
    IMGUI_DEMO_MARKER("Layout/Scrolling/Horizontal contents size demo window")
    ImGui.PushStyleVar(ImGuiStyleVar.ItemSpacing, ImVec2(2, 0))
    ImGui.PushStyleVar(ImGuiStyleVar.FramePadding, ImVec2(2, 0))
    DemoHelpMarker(
        "Test how different widgets react and impact the work rectangle growing when horizontal scrolling is enabled.\n\n" ..
        "Use 'Metrics->Tools->Show windows rectangles' to visualize rectangles.")
    _, SL.show_h_scrollbar = ImGui.Checkbox("H-scrollbar", SL.show_h_scrollbar)
    _, SL.show_button = ImGui.Checkbox("Button", SL.show_button)
    _, SL.show_tree_nodes = ImGui.Checkbox("Tree nodes", SL.show_tree_nodes)
    _, SL.show_text_wrapped = ImGui.Checkbox("Text wrapped", SL.show_text_wrapped)
    _, SL.show_columns = ImGui.Checkbox("Columns", SL.show_columns)
    _, SL.show_tab_bar = ImGui.Checkbox("Tab bar", SL.show_tab_bar)
    _, SL.show_child = ImGui.Checkbox("Child", SL.show_child)
    _, SL.explicit_content_size = ImGui.Checkbox("Explicit content size", SL.explicit_content_size)
    ImGui.Text("Scroll %.1f/%.1f %.1f/%.1f", ImGui.GetScrollX(), ImGui.GetScrollMaxX(), ImGui.GetScrollY(), ImGui.GetScrollMaxY())
    if SL.explicit_content_size then
        ImGui.SameLine()
        ImGui.SetNextItemWidth(ImGui.CalcTextSize("123456").x)
        SL.contents_size_x = ImGui.DragFloat("##csx", SL.contents_size_x)
        local p = ImGui.GetCursorScreenPos()
        ImGui.GetWindowDrawList():AddRectFilled(p, ImVec2(p.x + 10, p.y + 10), IM_COL32_WHITE)
        ImGui.GetWindowDrawList():AddRectFilled(ImVec2(p.x + SL.contents_size_x - 10, p.y), ImVec2(p.x + SL.contents_size_x, p.y + 10), IM_COL32_WHITE)
        ImGui.Dummy(ImVec2(0, 10))
    end
    ImGui.PopStyleVar(2)
    ImGui.Separator()
    if SL.show_button then
        ImGui.Button("this is a 300-wide button", ImVec2(300, 0))
    end
    if SL.show_tree_nodes then
        local open = true
        if ImGui.TreeNode("this is a tree node") then
            if ImGui.TreeNode("another one of those tree node...") then
                ImGui.Text("Some tree contents")
                ImGui.TreePop()
            end
            ImGui.TreePop()
        end
        ImGui.CollapsingHeader("CollapsingHeader", open)
    end
    if SL.show_text_wrapped then
        ImGui.TextWrapped("This text should automatically wrap on the edge of the work rectangle.")
    end
    if SL.show_columns then
        ImGui.Text("Tables:")
        if ImGui.BeginTable("table", 4, ImGuiTableFlags.Borders) then
            for n = 0, 3 do
                ImGui.TableNextColumn()
                ImGui.Text("Width %.2f", ImGui.GetContentRegionAvail().x)
            end
            ImGui.EndTable()
        end
        ImGui.Text("Columns:")
        if ImGui.Columns then
            ImGui.Columns(4)
            for n = 0, 3 do
                ImGui.Text("Width %.2f", ImGui.GetColumnWidth())
                ImGui.NextColumn()
            end
            ImGui.Columns(1)
        else
            NotPorted("Columns")
        end
    end
    if SL.show_tab_bar and ImGui.BeginTabBar and ImGui.BeginTabBar("Hello") then
        if ImGui.BeginTabItem("OneOneOne") then ImGui.EndTabItem() end
        if ImGui.BeginTabItem("TwoTwoTwo") then ImGui.EndTabItem() end
        if ImGui.BeginTabItem("ThreeThreeThree") then ImGui.EndTabItem() end
        if ImGui.BeginTabItem("FourFourFour") then ImGui.EndTabItem() end
        ImGui.EndTabBar()
    end
    if SL.show_child then
        BeginChild("child", ImVec2(0, 0), ImGuiChildFlags.Borders)
        ImGui.EndChild()
    end
    ImGui.End()
end

local function DemoWindowLayout_Scrolling()
    IMGUI_DEMO_MARKER("Layout/Scrolling/Vertical")
    DemoHelpMarker("Use SetScrollHereY() or SetScrollFromPosY() to scroll to a given vertical position.")

    _, SL.enable_extra_decorations = ImGui.Checkbox("Decoration", SL.enable_extra_decorations)

    ImGui.PushItemWidth(ImGui.GetFontSize() * 10)
    local changed
    SL.track_item, changed = ImGui.DragInt("##item", SL.track_item, 0.25, 0, 99, "Item = %d")
    SL.enable_track = SL.enable_track or changed
    ImGui.SameLine()
    _, SL.enable_track = ImGui.Checkbox("Track", SL.enable_track)

    local scroll_to_off
    SL.scroll_to_off_px, scroll_to_off = ImGui.DragFloat("##off", SL.scroll_to_off_px, 1.00, 0, FLT_MAX, "+%.0f px")
    ImGui.SameLine()
    scroll_to_off = ImGui.Button("Scroll Offset") or scroll_to_off

    local scroll_to_pos
    SL.scroll_to_pos_px, scroll_to_pos = ImGui.DragFloat("##pos", SL.scroll_to_pos_px, 1.00, -10, FLT_MAX, "X/Y = %.0f px")
    ImGui.SameLine()
    scroll_to_pos = ImGui.Button("Scroll To Pos") or scroll_to_pos
    ImGui.PopItemWidth()

    if scroll_to_off or scroll_to_pos then
        SL.enable_track = false
    end

    local style = ImGui.GetStyle()
    local child_w = (ImGui.GetContentRegionAvail().x - 4 * style.ItemSpacing.x) / 5
    if child_w < 1.0 then
        child_w = 1.0
    end
    ImGui.PushID("##VerticalScrolling")
    local vnames = { "Top", "25%", "Center", "75%", "Bottom" }
    for i = 0, 4 do
        if i > 0 then ImGui.SameLine() end
        ImGui.BeginGroup()
        ImGui.TextUnformatted(vnames[i + 1])

        local child_flags = SL.enable_extra_decorations and ImGuiWindowFlags.MenuBar or 0
        local child_id = ImGui.GetID(i)
        local child_is_visible = BeginChild(child_id, ImVec2(child_w, 200.0), ImGuiChildFlags.Borders, child_flags)
        if ImGui.BeginMenuBar() then
            ImGui.TextUnformatted("abc")
            ImGui.EndMenuBar()
        end
        if scroll_to_off then
            ImGui.SetScrollY(SL.scroll_to_off_px)
        end
        if scroll_to_pos then
            ImGui.SetScrollFromPosY(ImGui.GetCursorStartPos().y + SL.scroll_to_pos_px, i * 0.25)
        end
        if child_is_visible then -- Avoid calling SetScrollHereY when running with culled items
            for item = 0, 99 do
                if SL.enable_track and item == SL.track_item then
                    ImGui.TextColored(ImVec4(1, 1, 0, 1), "Item %d", item)
                    ImGui.SetScrollHereY(i * 0.25) -- 0.0f:top, 0.5f:center, 1.0f:bottom
                else
                    ImGui.Text("Item %d", item)
                end
            end
        end
        local scroll_y = ImGui.GetScrollY()
        local scroll_max_y = ImGui.GetScrollMaxY()
        ImGui.EndChild()
        ImGui.Text("%.0f/%.0f", scroll_y, scroll_max_y)
        ImGui.EndGroup()
    end
    ImGui.PopID()

    -- Horizontal scroll functions
    IMGUI_DEMO_MARKER("Layout/Scrolling/Horizontal")
    ImGui.Spacing()
    DemoHelpMarker(
        "Use SetScrollHereX() or SetScrollFromPosX() to scroll to a given horizontal position.\n\n" ..
        "Because the clipping rectangle of most window hides half worth of WindowPadding on the " ..
        "left/right, using SetScrollFromPosX(+1) will usually result in clipped text whereas the " ..
        "equivalent SetScrollFromPosY(+1) wouldn't.")
    ImGui.PushID("##HorizontalScrolling")
    local hnames = { "Left", "25%", "Center", "75%", "Right" }
    for i = 0, 4 do
        local child_height = ImGui.GetTextLineHeight() + style.ScrollbarSize + style.WindowPadding.y * 2.0
        local child_flags = bit32.bor(ImGuiWindowFlags.HorizontalScrollbar, SL.enable_extra_decorations and ImGuiWindowFlags.AlwaysVerticalScrollbar or 0)
        local child_id = ImGui.GetID(i)
        local child_is_visible = BeginChild(child_id, ImVec2(-100, child_height), ImGuiChildFlags.Borders, child_flags)
        if scroll_to_off then
            ImGui.SetScrollX(SL.scroll_to_off_px)
        end
        if scroll_to_pos then
            ImGui.SetScrollFromPosX(ImGui.GetCursorStartPos().x + SL.scroll_to_pos_px, i * 0.25)
        end
        if child_is_visible then
            for item = 0, 99 do
                if item > 0 then
                    ImGui.SameLine()
                end
                if SL.enable_track and item == SL.track_item then
                    ImGui.TextColored(ImVec4(1, 1, 0, 1), "Item %d", item)
                    ImGui.SetScrollHereX(i * 0.25) -- 0.0f:left, 0.5f:center, 1.0f:right
                else
                    ImGui.Text("Item %d", item)
                end
            end
        end
        local scroll_x = ImGui.GetScrollX()
        local scroll_max_x = ImGui.GetScrollMaxX()
        ImGui.EndChild()
        ImGui.SameLine()
        ImGui.Text("%s\n%.0f/%.0f", hnames[i + 1], scroll_x, scroll_max_x)
        ImGui.Spacing()
    end
    ImGui.PopID()

    -- Miscellaneous Horizontal Scrolling Demo
    IMGUI_DEMO_MARKER("Layout/Scrolling/Horizontal (more)")
    DemoHelpMarker(
        "Horizontal scrolling for a window is enabled via the ImGuiWindowFlags_HorizontalScrollbar flag.\n\n" ..
        "You may want to also explicitly specify content width by using SetNextWindowContentWidth() before Begin().")
    SL.lines = ImGui.SliderInt("Lines", SL.lines, 1, 15)
    ImGui.PushStyleVar(ImGuiStyleVar.FrameRounding, 3.0)
    ImGui.PushStyleVar(ImGuiStyleVar.FramePadding, ImVec2(2.0, 1.0))
    local scrolling_child_size = ImVec2(0, ImGui.GetFrameHeightWithSpacing() * 7 + 30)
    BeginChild("scrolling", scrolling_child_size, ImGuiChildFlags.Borders, ImGuiWindowFlags.HorizontalScrollbar)
    for line = 0, SL.lines - 1 do
        local num_buttons = 10 + ((line % 2 == 1) and line * 9 or line * 3)
        local base_w = ImGui.GetFontSize() * 3
        for n = 0, num_buttons - 1 do
            if n > 0 then ImGui.SameLine() end
            ImGui.PushID(n + line * 1000)
            local label = (n % 15 == 0) and "FizzBuzz" or (n % 3 == 0) and "Fizz" or (n % 5 == 0) and "Buzz" or tostring(n)
            local hue = n * 0.05
            ImGui.PushStyleColor(ImGuiCol.Button, HSV(hue, 0.6, 0.6))
            ImGui.PushStyleColor(ImGuiCol.ButtonHovered, HSV(hue, 0.7, 0.7))
            ImGui.PushStyleColor(ImGuiCol.ButtonActive, HSV(hue, 0.8, 0.8))
            ImGui.Button(label, ImVec2(base_w + math.sin(line + n) * base_w * 0.5, 0.0))
            ImGui.PopStyleColor(3)
            ImGui.PopID()
        end
    end
    local scroll_x = ImGui.GetScrollX()
    local scroll_max_x = ImGui.GetScrollMaxX()
    ImGui.EndChild()
    ImGui.PopStyleVar(2)
    local scroll_x_delta = 0.0
    ImGui.SmallButton("<<")
    if ImGui.IsItemActive() then
        scroll_x_delta = -ImGui.GetIO().DeltaTime * 1000.0
    end
    ImGui.SameLine()
    ImGui.Text("Scroll from code"); ImGui.SameLine()
    ImGui.SmallButton(">>")
    if ImGui.IsItemActive() then
        scroll_x_delta = ImGui.GetIO().DeltaTime * 1000.0
    end
    ImGui.SameLine()
    ImGui.Text("%.0f/%.0f", scroll_x, scroll_max_x)
    if scroll_x_delta ~= 0.0 then
        -- Demonstrate a trick: you can use Begin to set yourself in the context of another window
        BeginChild("scrolling")
        ImGui.SetScrollX(ImGui.GetScrollX() + scroll_x_delta)
        ImGui.EndChild()
    end
    ImGui.Spacing()

    _, SL.show_horizontal_contents_size_demo_window = ImGui.Checkbox("Show Horizontal contents size demo window", SL.show_horizontal_contents_size_demo_window)

    if SL.show_horizontal_contents_size_demo_window then
        DemoWindowLayout_HorizontalContentsSizeWindow()
    end
end

local function DemoWindowLayout_TextClipping()
    IMGUI_DEMO_MARKER("Layout/Text Clipping")
    if SL.clip_size == nil then SL.clip_size = { 100.0, 100.0 }; SL.clip_offset = ImVec2(30.0, 30.0) end
    ImGui.DragFloat2("size", SL.clip_size, 0.5, 1.0, 200.0, "%.0f")
    ImGui.TextWrapped("(Click and drag to scroll)")

    DemoHelpMarker(
        "(Left) Using ImGui::PushClipRect():\n" ..
        "Will alter ImGui hit-testing logic + ImDrawList rendering.\n" ..
        "(use this if you want your clipping rectangle to affect interactions)\n\n" ..
        "(Center) Using ImDrawList::PushClipRect():\n" ..
        "Will alter ImDrawList rendering only.\n" ..
        "(use this as a shortcut if you are only using ImDrawList calls)\n\n" ..
        "(Right) Using ImDrawList::AddText() with a fine ClipRect:\n" ..
        "Will alter only this specific ImDrawList::AddText() rendering.\n" ..
        "This is often used internally to avoid altering the clipping rectangle and minimize draw calls.")

    local size = ImVec2(SL.clip_size[1], SL.clip_size[2])
    local offset = SL.clip_offset
    for n = 0, 2 do repeat
        if n > 0 then
            ImGui.SameLine()
        end

        ImGui.PushID(n)
        ImGui.InvisibleButton("##canvas", size)
        if ImGui.IsItemActive() and ImGui.IsMouseDragging(ImGuiMouseButton.Left) then
            offset.x = offset.x + ImGui.GetIO().MouseDelta.x
            offset.y = offset.y + ImGui.GetIO().MouseDelta.y
        end
        ImGui.PopID()
        if not ImGui.IsItemVisible() then -- Skip rendering as ImDrawList elements are not clipped.
            break
        end

        local p0 = ImGui.GetItemRectMin()
        local p1 = ImGui.GetItemRectMax()
        local text_str = "Line 1 hello\nLine 2 clip me!"
        local text_pos = ImVec2(p0.x + offset.x, p0.y + offset.y)
        local draw_list = ImGui.GetWindowDrawList()
        if n == 0 then
            ImGui.PushClipRect(p0, p1, true)
            draw_list:AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255))
            draw_list:AddText(text_pos, IM_COL32_WHITE, text_str)
            ImGui.PopClipRect()
        elseif n == 1 then
            draw_list:PushClipRect(p0, p1, true)
            draw_list:AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255))
            draw_list:AddText(text_pos, IM_COL32_WHITE, text_str)
            draw_list:PopClipRect()
        else
            local clip_rect = ImVec4(p0.x, p0.y, p1.x, p1.y)
            draw_list:AddRectFilled(p0, p1, IM_COL32(90, 90, 120, 255))
            draw_list:AddText(ImGui.GetFont(), ImGui.GetFontSize(), text_pos, IM_COL32_WHITE, text_str, 1, #text_str + 1, 0.0, clip_rect)
        end
    until true end
end

local function DemoWindowLayout_OverlapMode()
    IMGUI_DEMO_MARKER("Layout/Overlap Mode")
    DemoHelpMarker(
        "Hit-testing is by default performed in item submission order, which generally is perceived as 'back-to-front'.\n\n" ..
        "By using SetNextItemAllowOverlap() you can notify that an item may be overlapped by another. " ..
        "Doing so alters the hovering logic: items using AllowOverlap mode requires an extra frame to accept hovered state.")
    _, SL.enable_allow_overlap = ImGui.Checkbox("Enable AllowOverlap", SL.enable_allow_overlap)

    local button1_pos = ImGui.GetCursorScreenPos()
    local button2_pos = ImVec2(button1_pos.x + 50.0, button1_pos.y + 50.0)
    if SL.enable_allow_overlap then
        ImGui.SetNextItemAllowOverlap()
    end
    ImGui.Button("Button 1", ImVec2(80, 80))
    ImGui.SetCursorScreenPos(button2_pos)
    ImGui.Button("Button 2", ImVec2(80, 80))

    if SL.enable_allow_overlap then
        ImGui.SetNextItemAllowOverlap()
    end
    ImGui.Selectable("Some Selectable", false)
    ImGui.SameLine()
    ImGui.SmallButton("++")
end

function DemoWindowLayout()
    if not ImGui.CollapsingHeader("Layout & Scrolling") then
        return
    end
    if ImGui.TreeNode("Child windows") then DemoWindowLayout_ChildWindows(); ImGui.TreePop() end
    if ImGui.TreeNode("Widgets Width") then DemoWindowLayout_WidgetsWidth(); ImGui.TreePop() end
    if ImGui.TreeNode("Basic Horizontal Layout") then DemoWindowLayout_BasicHorizontal(); ImGui.TreePop() end
    if ImGui.TreeNode("Groups") then DemoWindowLayout_Groups(); ImGui.TreePop() end
    if ImGui.TreeNode("Text Baseline Alignment") then DemoWindowLayout_TextBaseline(); ImGui.TreePop() end
    if ImGui.TreeNode("Scrolling") then DemoWindowLayout_Scrolling(); ImGui.TreePop() end
    if ImGui.TreeNode("Text Clipping") then DemoWindowLayout_TextClipping(); ImGui.TreePop() end
    if ImGui.TreeNode("Overlap Mode") then DemoWindowLayout_OverlapMode(); ImGui.TreePop() end
end

-------------------------------------------------------------------------------
-- [SECTION] DemoWindowPopups()
-------------------------------------------------------------------------------

local SP = {
    selected_fish = -1, toggles = { true, false, false, false, false },
    ctx_selected = -1, value = 0.5, name = nil,
    dont_ask_me_next_time = false, item = 1, color = { 0.4, 0.7, 0.0, 0.5 },
}

local function DemoWindowPopups_Popups()
    IMGUI_DEMO_MARKER("Popups/Popups")
    ImGui.TextWrapped(
        "When a popup is active, it inhibits interacting with windows that are behind the popup. " ..
        "Clicking outside the popup closes it.")

    local names = { "Bream", "Haddock", "Mackerel", "Pollock", "Tilefish" }
    local toggles = SP.toggles

    if ImGui.Button("Select..") then
        ImGui.OpenPopup("my_select_popup")
    end
    ImGui.SameLine()
    ImGui.TextUnformatted(SP.selected_fish == -1 and "<None>" or names[SP.selected_fish + 1])
    if ImGui.BeginPopup("my_select_popup") then
        ImGui.SeparatorText("Aquarium")
        for i = 1, #names do
            if ImGui.Selectable(names[i]) then
                SP.selected_fish = i - 1
            end
        end
        ImGui.EndPopup()
    end

    -- Showing a menu with toggles
    if ImGui.Button("Toggle..") then
        ImGui.OpenPopup("my_toggle_popup")
    end
    if ImGui.BeginPopup("my_toggle_popup") then
        for i = 1, #names do
            _, toggles[i] = ImGui.MenuItem(names[i], "", toggles[i])
        end
        if ImGui.BeginMenu("Sub-menu") then
            ImGui.MenuItem("Click me")
            ImGui.EndMenu()
        end

        ImGui.Separator()
        ImGui.Text("Tooltip here")
        ImGui.SetItemTooltip("I am a tooltip over a popup")

        if ImGui.Button("Stacked Popup") then
            ImGui.OpenPopup("another popup")
        end
        if ImGui.BeginPopup("another popup") then
            for i = 1, #names do
                _, toggles[i] = ImGui.MenuItem(names[i], "", toggles[i])
            end
            if ImGui.BeginMenu("Sub-menu") then
                ImGui.MenuItem("Click me")
                if ImGui.Button("Stacked Popup") then
                    ImGui.OpenPopup("another popup")
                end
                if ImGui.BeginPopup("another popup") then
                    ImGui.Text("I am the last one here.")
                    ImGui.EndPopup()
                end
                ImGui.EndMenu()
            end
            ImGui.EndPopup()
        end
        ImGui.EndPopup()
    end

    -- Call the more complete ShowExampleMenuFile which we use in various places of this demo
    if ImGui.Button("With a menu..") then
        ImGui.OpenPopup("my_file_popup")
    end
    if ImGui.BeginPopup("my_file_popup", ImGuiWindowFlags.MenuBar) then
        if ImGui.BeginMenuBar() then
            if ImGui.BeginMenu("File") then
                DemoMenuFile()
                ImGui.EndMenu()
            end
            if ImGui.BeginMenu("Edit") then
                ImGui.MenuItem("Dummy")
                ImGui.EndMenu()
            end
            ImGui.EndMenuBar()
        end
        ImGui.Text("Hello from popup!")
        ImGui.Button("This is a dummy button..")
        ImGui.EndPopup()
    end
end

local function DemoWindowPopups_ContextMenus()
    IMGUI_DEMO_MARKER("Popups/Context menus")
    DemoHelpMarker("\"Context\" functions are simple helpers to associate a Popup to a given Item or Window identifier.")

    -- Example 1
    do
        local names = { "Label1", "Label2", "Label3", "Label4", "Label5" }
        for n = 0, 4 do
            if ImGui.Selectable(names[n + 1], SP.ctx_selected == n) then
                SP.ctx_selected = n
            end
            if ImGui.BeginPopupContextItem() then -- <-- use last item id as popup id
                SP.ctx_selected = n
                ImGui.Text("This is a popup for \"%s\"!", names[n + 1])
                if ImGui.Button("Close") then
                    ImGui.CloseCurrentPopup()
                end
                ImGui.EndPopup()
            end
            ImGui.SetItemTooltip("Right-click to open popup")
        end
    end

    -- Example 2
    do
        DemoHelpMarker("Text() elements don't have stable identifiers so we need to provide one.")
        ImGui.Text("Value = %.3f <-- (1) right-click this text", SP.value)
        if ImGui.BeginPopupContextItem("my popup") then
            if ImGui.Selectable("Set to zero") then SP.value = 0.0 end
            if ImGui.Selectable("Set to PI") then SP.value = 3.1415 end
            ImGui.SetNextItemWidth(-FLT_MIN)
            SP.value = ImGui.DragFloat("##Value", SP.value, 0.1, 0.0, 0.0)
            ImGui.EndPopup()
        end

        ImGui.Text("(2) Or right-click this text")
        ImGui.OpenPopupOnItemClick("my popup", ImGuiPopupFlags.MouseButtonRight)

        if ImGui.Button("(3) Or click this button") then
            ImGui.OpenPopup("my popup")
        end
    end

    -- Example 3
    do
        DemoHelpMarker("Showcase using a popup ID linked to item ID, with the item having a changing label + stable ID using the ### operator.")
        if SP.name == nil then SP.name = Buf("Label1", 32) end
        local buf = string.format("Button: %s###Button", BufStr(SP.name)) -- ### operator override ID ignoring the preceding label
        ImGui.Button(buf)
        if ImGui.BeginPopupContextItem() then
            ImGui.Text("Edit name:")
            ImGui.InputText("##edit", SP.name, 32)
            if ImGui.Button("Close") then
                ImGui.CloseCurrentPopup()
            end
            ImGui.EndPopup()
        end
        ImGui.SameLine(); ImGui.Text("(<-- right-click here)")
    end
end

local function DemoWindowPopups_Modals()
    IMGUI_DEMO_MARKER("Popups/Modals")
    ImGui.TextWrapped("Modal windows are like popups but the user cannot close them by clicking outside.")

    if ImGui.Button("Delete..") then
        ImGui.OpenPopup("Delete?")
    end

    -- Always center this window when appearing
    local center = ImGui.GetMainViewport():GetCenter()
    ImGui.SetNextWindowPos(center, ImGuiCond.Appearing, ImVec2(0.5, 0.5))

    if ImGui.BeginPopupModal("Delete?", nil, ImGuiWindowFlags.AlwaysAutoResize) then
        ImGui.Text("All those beautiful files will be deleted.\nThis operation cannot be undone!")
        ImGui.Separator()

        ImGui.PushStyleVar(ImGuiStyleVar.FramePadding, ImVec2(0, 0))
        _, SP.dont_ask_me_next_time = ImGui.Checkbox("Don't ask me next time", SP.dont_ask_me_next_time)
        ImGui.PopStyleVar()

        if ImGui.Button("OK", ImVec2(120, 0)) then ImGui.CloseCurrentPopup() end
        ImGui.SetItemDefaultFocus()
        ImGui.SameLine()
        if ImGui.Button("Cancel", ImVec2(120, 0)) then ImGui.CloseCurrentPopup() end
        ImGui.EndPopup()
    end

    if ImGui.Button("Stacked modals..") then
        ImGui.OpenPopup("Stacked 1")
    end
    if ImGui.BeginPopupModal("Stacked 1", nil, ImGuiWindowFlags.MenuBar) then
        if ImGui.BeginMenuBar() then
            if ImGui.BeginMenu("File") then
                if ImGui.MenuItem("Some menu item") then end
                ImGui.EndMenu()
            end
            ImGui.EndMenuBar()
        end
        ImGui.Text("Hello from Stacked The First\nUsing style.Colors[ImGuiCol_ModalWindowDimBg] behind it.")

        -- Testing behavior of widgets stacking their own regular popups over the modal.
        if ImGui.Combo then
            SP.item = ImGui.Combo("Combo", SP.item, { "aaaa", "bbbb", "cccc", "dddd", "eeee" }, 5)
        else
            NotPorted("Combo")
        end
        ImGui.ColorEdit4("Color", SP.color)

        if ImGui.Button("Add another modal..") then
            ImGui.OpenPopup("Stacked 2")
        end

        local unused_open = true
        if ImGui.BeginPopupModal("Stacked 2", unused_open) then
            ImGui.Text("Hello from Stacked The Second!")
            ImGui.ColorEdit4("Color", SP.color) -- Allow opening another nested popup
            if ImGui.Button("Close") then
                ImGui.CloseCurrentPopup()
            end
            ImGui.EndPopup()
        end

        if ImGui.Button("Close") then
            ImGui.CloseCurrentPopup()
        end
        ImGui.EndPopup()
    end
end

function DemoWindowPopups()
    if not ImGui.CollapsingHeader("Popups & Modal windows") then
        return
    end

    if ImGui.TreeNode("Popups") then DemoWindowPopups_Popups(); ImGui.TreePop() end
    if ImGui.TreeNode("Context menus") then DemoWindowPopups_ContextMenus(); ImGui.TreePop() end
    if ImGui.TreeNode("Modals") then
        if ImGui.BeginPopupModal then DemoWindowPopups_Modals() else NotPorted("BeginPopupModal") end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Menus inside a regular window") then
        IMGUI_DEMO_MARKER("Popups/Menus inside a regular window")
        ImGui.TextWrapped("Below we are testing adding menu items to a regular window. It's rather unusual but should work!")
        ImGui.Separator()

        ImGui.MenuItem("Menu item", "Ctrl+M")
        if ImGui.BeginMenu("Menu inside a regular window") then
            DemoMenuFile()
            ImGui.EndMenu()
        end
        ImGui.Separator()
        ImGui.TreePop()
    end
end

-------------------------------------------------------------------------------
-- [SECTION] DemoWindowTables()
-------------------------------------------------------------------------------

-- MyItemColumnID
local MyItemColumnID_ID, MyItemColumnID_Name, MyItemColumnID_Action, MyItemColumnID_Quantity, MyItemColumnID_Description = 0, 1, 2, 3, 4

local function MyItem(id, name, quantity) return { ID = id, Name = name, Quantity = quantity } end

--- Sort a Lua array (1-based) of MyItem with ImGuiTableSortSpecs (Specs is 1-based array or ImVector)
local function MyItem_SortWithSortSpecs(sort_specs, items, items_count)
    if items_count <= 1 then return end
    local specs = sort_specs.Specs
    local function get_spec(n) -- n: 0-based
        if specs.Data then return specs.Data[n + 1] end
        return specs[n + 1]
    end
    local function cmp(a, b) -- returns <0, 0, >0
        for n = 0, sort_specs.SpecsCount - 1 do
            local sort_spec = get_spec(n)
            local delta = 0
            local uid = sort_spec.ColumnUserID
            if uid == MyItemColumnID_ID then delta = a.ID - b.ID
            elseif uid == MyItemColumnID_Name then delta = (a.Name < b.Name) and -1 or (a.Name > b.Name) and 1 or 0
            elseif uid == MyItemColumnID_Quantity then delta = a.Quantity - b.Quantity
            elseif uid == MyItemColumnID_Description then delta = (a.Name < b.Name) and -1 or (a.Name > b.Name) and 1 or 0
            else IM_ASSERT(false) end
            if delta > 0 then
                return (sort_spec.SortDirection == ImGuiSortDirection.Ascending) and 1 or -1
            end
            if delta < 0 then
                return (sort_spec.SortDirection == ImGuiSortDirection.Ascending) and -1 or 1
            end
        end
        return a.ID - b.ID
    end
    local arr = items.Data or items
    if items.Data then
        -- ImVector: sort only the used range
        local tmp = {}
        for i = 1, items_count do tmp[i] = arr[i] end
        table.sort(tmp, function(a, b) return cmp(a, b) < 0 end)
        for i = 1, items_count do arr[i] = tmp[i] end
    else
        table.sort(arr, function(a, b) return cmp(a, b) < 0 end)
    end
end

-- Make the UI compact because there are so many fields
local function PushStyleCompact()
    local style = ImGui.GetStyle()
    ImGui.PushStyleVarY(ImGuiStyleVar.FramePadding, math.floor(style.FramePadding.y * 0.60))
    ImGui.PushStyleVarY(ImGuiStyleVar.ItemSpacing, math.floor(style.ItemSpacing.y * 0.60))
end

local function PopStyleCompact()
    ImGui.PopStyleVar(2)
end

local table_sizing_policies = nil
-- Show a combo box with a choice of sizing policies
local function EditTableSizingFlags(flags)
    if table_sizing_policies == nil then
        table_sizing_policies = {
            { Value = ImGuiTableFlags.None,              Name = "Default",                           Tooltip = "Use default sizing policy:\n- ImGuiTableFlags_SizingFixedFit if ScrollX is on or if host window has ImGuiWindowFlags_AlwaysAutoResize.\n- ImGuiTableFlags_SizingStretchSame otherwise." },
            { Value = ImGuiTableFlags.SizingFixedFit,    Name = "ImGuiTableFlags_SizingFixedFit",    Tooltip = "Columns default to _WidthFixed (if resizable) or _WidthAuto (if not resizable), matching contents width." },
            { Value = ImGuiTableFlags.SizingFixedSame,   Name = "ImGuiTableFlags_SizingFixedSame",   Tooltip = "Columns are all the same width, matching the maximum contents width.\nImplicitly disable ImGuiTableFlags_Resizable and enable ImGuiTableFlags_NoKeepColumnsVisible." },
            { Value = ImGuiTableFlags.SizingStretchProp, Name = "ImGuiTableFlags_SizingStretchProp", Tooltip = "Columns default to _WidthStretch with weights proportional to their widths." },
            { Value = ImGuiTableFlags.SizingStretchSame, Name = "ImGuiTableFlags_SizingStretchSame", Tooltip = "Columns default to _WidthStretch with same weights." },
        }
    end
    local policies = table_sizing_policies
    local idx = 1
    while idx <= #policies do
        if policies[idx].Value == bit32.band(flags, ImGuiTableFlags.SizingMask_) then break end
        idx = idx + 1
    end
    local preview_text = (idx <= #policies) and (idx > 1 and string.sub(policies[idx].Name, #"ImGuiTableFlags" + 1) or policies[idx].Name) or ""
    if ImGui.BeginCombo("Sizing Policy", preview_text) then
        for n = 1, #policies do
            if ImGui.Selectable(policies[n].Name, idx == n) then
                flags = bit32.bor(bit32.band(flags, bit32.bnot(ImGuiTableFlags.SizingMask_)), policies[n].Value)
            end
        end
        ImGui.EndCombo()
    end
    ImGui.SameLine()
    ImGui.TextDisabled("(?)")
    if ImGui.BeginItemTooltip() then
        ImGui.PushTextWrapPos(ImGui.GetFontSize() * 50.0)
        for m = 1, #policies do
            ImGui.Separator()
            ImGui.Text("%s:", policies[m].Name)
            ImGui.Separator()
            ImGui.SetCursorPosX(ImGui.GetCursorPosX() + ImGui.GetStyle().IndentSpacing * 0.5)
            ImGui.TextUnformatted(policies[m].Tooltip)
        end
        ImGui.PopTextWrapPos()
        ImGui.EndTooltip()
    end
    return flags
end

local function EditTableColumnsFlags(f)
    local p
    local F = ImGuiTableColumnFlags
    _, f = ImGui.CheckboxFlags("_Disabled", f, F.Disabled); ImGui.SameLine(); DemoHelpMarker("Master disable flag (also hide from context menu)")
    _, f = ImGui.CheckboxFlags("_DefaultHide", f, F.DefaultHide)
    _, f = ImGui.CheckboxFlags("_DefaultSort", f, F.DefaultSort)
    p, f = ImGui.CheckboxFlags("_WidthStretch", f, F.WidthStretch)
    if p then f = bit32.band(f, bit32.bnot(bit32.bxor(F.WidthMask_, F.WidthStretch))) end
    p, f = ImGui.CheckboxFlags("_WidthFixed", f, F.WidthFixed)
    if p then f = bit32.band(f, bit32.bnot(bit32.bxor(F.WidthMask_, F.WidthFixed))) end
    _, f = ImGui.CheckboxFlags("_NoResize", f, F.NoResize)
    _, f = ImGui.CheckboxFlags("_NoReorder", f, F.NoReorder)
    _, f = ImGui.CheckboxFlags("_NoHide", f, F.NoHide)
    _, f = ImGui.CheckboxFlags("_NoClip", f, F.NoClip)
    _, f = ImGui.CheckboxFlags("_NoSort", f, F.NoSort)
    _, f = ImGui.CheckboxFlags("_NoSortAscending", f, F.NoSortAscending)
    _, f = ImGui.CheckboxFlags("_NoSortDescending", f, F.NoSortDescending)
    _, f = ImGui.CheckboxFlags("_NoHeaderLabel", f, F.NoHeaderLabel)
    _, f = ImGui.CheckboxFlags("_NoHeaderWidth", f, F.NoHeaderWidth)
    _, f = ImGui.CheckboxFlags("_PreferSortAscending", f, F.PreferSortAscending)
    _, f = ImGui.CheckboxFlags("_PreferSortDescending", f, F.PreferSortDescending)
    _, f = ImGui.CheckboxFlags("_IndentEnable", f, F.IndentEnable); ImGui.SameLine(); DemoHelpMarker("Default for column 0")
    _, f = ImGui.CheckboxFlags("_IndentDisable", f, F.IndentDisable); ImGui.SameLine(); DemoHelpMarker("Default for column >0")
    _, f = ImGui.CheckboxFlags("_AngledHeader", f, F.AngledHeader)
    return f
end

local function ShowTableColumnsStatusFlags(flags)
    ImGui.CheckboxFlags("_IsEnabled", flags, ImGuiTableColumnFlags.IsEnabled)
    ImGui.CheckboxFlags("_IsVisible", flags, ImGuiTableColumnFlags.IsVisible)
    ImGui.CheckboxFlags("_IsSorted", flags, ImGuiTableColumnFlags.IsSorted)
    ImGui.CheckboxFlags("_IsHovered", flags, ImGuiTableColumnFlags.IsHovered)
end

local function bor(...) return bit32.bor(...) end
local TF = setmetatable({}, { __index = function(_, k) return ImGuiTableFlags[k] end })

local ST = {} -- statics for DemoWindowTables (one sub-table per section)
local TEXT_BASE_WIDTH, TEXT_BASE_HEIGHT = 0, 0

local function Tables_Basic()
    IMGUI_DEMO_MARKER("Tables/Basic")
    -- [Method 1] Using TableNextRow() to create a new row, and TableSetColumnIndex() to select the column.
    DemoHelpMarker("Using TableNextRow() + calling TableSetColumnIndex() _before_ each cell, in a loop.")
    if ImGui.BeginTable("table1", 3) then
        for row = 0, 3 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("Row %d Column %d", row, column)
            end
        end
        ImGui.EndTable()
    end

    -- [Method 2] Using TableNextColumn() called multiple times, instead of using a for loop + TableSetColumnIndex().
    DemoHelpMarker("Using TableNextRow() + calling TableNextColumn() _before_ each cell, manually.")
    if ImGui.BeginTable("table2", 3) then
        for row = 0, 3 do
            ImGui.TableNextRow()
            ImGui.TableNextColumn()
            ImGui.Text("Row %d", row)
            ImGui.TableNextColumn()
            ImGui.Text("Some contents")
            ImGui.TableNextColumn()
            ImGui.Text("123.456")
        end
        ImGui.EndTable()
    end

    -- [Method 3] We call TableNextColumn() _before_ each cell. We never call TableNextRow(),
    DemoHelpMarker(
        "Only using TableNextColumn(), which tends to be convenient for tables where every cell contains " ..
        "the same type of contents.\n This is also more similar to the old NextColumn() function of the " ..
        "Columns API, and provided to facilitate the Columns->Tables API transition.")
    if ImGui.BeginTable("table3", 3) then
        for item = 0, 13 do
            ImGui.TableNextColumn()
            ImGui.Text("Item %d", item)
        end
        ImGui.EndTable()
    end
end

local function Tables_BordersBackground()
    IMGUI_DEMO_MARKER("Tables/Borders, background")
    local CT_Text, CT_FillButton = 0, 1
    local s = ST.borders
    if s == nil then s = { flags = bor(TF.Borders, TF.RowBg), display_headers = false, contents_type = CT_Text }; ST.borders = s end

    PushStyleCompact()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_RowBg", s.flags, TF.RowBg)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Borders", s.flags, TF.Borders)
    ImGui.SameLine(); DemoHelpMarker("ImGuiTableFlags_Borders\n = ImGuiTableFlags_BordersInnerV\n | ImGuiTableFlags_BordersOuterV\n | ImGuiTableFlags_BordersInnerH\n | ImGuiTableFlags_BordersOuterH")
    ImGui.Indent()

    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersH", s.flags, TF.BordersH)
    ImGui.Indent()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersOuterH", s.flags, TF.BordersOuterH)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersInnerH", s.flags, TF.BordersInnerH)
    ImGui.Unindent()

    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersV", s.flags, TF.BordersV)
    ImGui.Indent()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersOuterV", s.flags, TF.BordersOuterV)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersInnerV", s.flags, TF.BordersInnerV)
    ImGui.Unindent()

    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersOuter", s.flags, TF.BordersOuter)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersInner", s.flags, TF.BordersInner)
    ImGui.Unindent()

    ImGui.AlignTextToFramePadding(); ImGui.Text("Cell contents:")
    ImGui.SameLine(); _, s.contents_type = ImGui.RadioButton("Text", s.contents_type, CT_Text)
    ImGui.SameLine(); _, s.contents_type = ImGui.RadioButton("FillButton", s.contents_type, CT_FillButton)
    _, s.display_headers = ImGui.Checkbox("Display headers", s.display_headers)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoBordersInBody", s.flags, TF.NoBordersInBody); ImGui.SameLine(); DemoHelpMarker("Disable vertical borders in columns Body (borders will always appear in Headers)")
    PopStyleCompact()

    if ImGui.BeginTable("table1", 3, s.flags) then
        if s.display_headers then
            ImGui.TableSetupColumn("One")
            ImGui.TableSetupColumn("Two")
            ImGui.TableSetupColumn("Three")
            ImGui.TableHeadersRow()
        end

        for row = 0, 4 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableSetColumnIndex(column)
                local buf = string.format("Hello %d,%d", column, row)
                if s.contents_type == CT_Text then
                    ImGui.TextUnformatted(buf)
                elseif s.contents_type == CT_FillButton then
                    ImGui.Button(buf, ImVec2(-FLT_MIN, 0.0))
                end
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_HelloGrid(id, flags, rows, cols, fmt)
    if ImGui.BeginTable(id, cols, flags) then
        for row = 0, rows - 1 do
            ImGui.TableNextRow()
            for column = 0, cols - 1 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text(fmt or "Hello %d,%d", column, row)
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_ResizableStretch()
    IMGUI_DEMO_MARKER("Tables/Resizable, stretch")
    local s = ST.rstretch
    if s == nil then s = { flags = bor(TF.SizingStretchSame, TF.Resizable, TF.BordersOuter, TF.BordersV, TF.ContextMenuInBody) }; ST.rstretch = s end
    PushStyleCompact()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags, TF.Resizable)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersV", s.flags, TF.BordersV)
    ImGui.SameLine(); DemoHelpMarker(
        "Using the _Resizable flag automatically enables the _BordersInnerV flag as well, " ..
        "this is why the resize borders are still showing when unchecking this.")
    PopStyleCompact()

    Tables_HelloGrid("table1", s.flags, 5, 3)
end

local function Tables_ResizableFixed()
    IMGUI_DEMO_MARKER("Tables/Resizable, fixed")
    DemoHelpMarker(
        "Using _Resizable + _SizingFixedFit flags.\n" ..
        "Fixed-width columns generally makes more sense if you want to use horizontal scrolling.\n\n" ..
        "Double-click a column border to auto-fit the column to its contents.")
    PushStyleCompact()
    local s = ST.rfixed
    if s == nil then s = { flags = bor(TF.SizingFixedFit, TF.Resizable, TF.BordersOuter, TF.BordersV, TF.ContextMenuInBody) }; ST.rfixed = s end
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoHostExtendX", s.flags, TF.NoHostExtendX)
    PopStyleCompact()

    Tables_HelloGrid("table1", s.flags, 5, 3)
end

local function Tables_ResizableMixed()
    IMGUI_DEMO_MARKER("Tables/Resizable, mixed")
    DemoHelpMarker(
        "Using TableSetupColumn() to alter resizing policy on a per-column basis.\n\n" ..
        "When combining Fixed and Stretch columns, generally you only want one, maybe two trailing columns to use _WidthStretch.")
    local flags = bor(TF.SizingFixedFit, TF.RowBg, TF.Borders, TF.Resizable, TF.Reorderable, TF.Hideable)
    local CF = ImGuiTableColumnFlags

    if ImGui.BeginTable("table1", 3, flags) then
        ImGui.TableSetupColumn("AAA", CF.WidthFixed)
        ImGui.TableSetupColumn("BBB", CF.WidthFixed)
        ImGui.TableSetupColumn("CCC", CF.WidthStretch)
        ImGui.TableHeadersRow()
        for row = 0, 4 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("%s %d,%d", (column == 2) and "Stretch" or "Fixed", column, row)
            end
        end
        ImGui.EndTable()
    end
    if ImGui.BeginTable("table2", 6, flags) then
        ImGui.TableSetupColumn("AAA", CF.WidthFixed)
        ImGui.TableSetupColumn("BBB", CF.WidthFixed)
        ImGui.TableSetupColumn("CCC", bor(CF.WidthFixed, CF.DefaultHide))
        ImGui.TableSetupColumn("DDD", CF.WidthStretch)
        ImGui.TableSetupColumn("EEE", CF.WidthStretch)
        ImGui.TableSetupColumn("FFF", bor(CF.WidthStretch, CF.DefaultHide))
        ImGui.TableHeadersRow()
        for row = 0, 4 do
            ImGui.TableNextRow()
            for column = 0, 5 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("%s %d,%d", (column >= 3) and "Stretch" or "Fixed", column, row)
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_Reorderable()
    IMGUI_DEMO_MARKER("Tables/Reorderable, hideable, with headers")
    DemoHelpMarker(
        "Click and drag column headers to reorder columns.\n\n" ..
        "Right-click on a header to open a context menu.")
    local s = ST.reorder
    if s == nil then s = { flags = bor(TF.Resizable, TF.Reorderable, TF.Hideable, TF.BordersOuter, TF.BordersV) }; ST.reorder = s end
    PushStyleCompact()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags, TF.Resizable)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Reorderable", s.flags, TF.Reorderable)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Hideable", s.flags, TF.Hideable)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoBordersInBody", s.flags, TF.NoBordersInBody)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoBordersInBodyUntilResize", s.flags, TF.NoBordersInBodyUntilResize); ImGui.SameLine(); DemoHelpMarker("Disable vertical borders in columns Body until hovered for resize (borders will always appear in Headers)")
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_HighlightHoveredColumn", s.flags, TF.HighlightHoveredColumn)
    PopStyleCompact()

    if ImGui.BeginTable("table1", 3, s.flags) then
        ImGui.TableSetupColumn("One")
        ImGui.TableSetupColumn("Two")
        ImGui.TableSetupColumn("Three")
        ImGui.TableHeadersRow()
        for row = 0, 5 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("Hello %d,%d", column, row)
            end
        end
        ImGui.EndTable()
    end

    -- Use outer_size.x == 0.0f instead of default to make the table as tight as possible
    if ImGui.BeginTable("table2", 3, bor(s.flags, TF.SizingFixedFit), ImVec2(0.0, 0.0)) then
        ImGui.TableSetupColumn("One")
        ImGui.TableSetupColumn("Two")
        ImGui.TableSetupColumn("Three")
        ImGui.TableHeadersRow()
        for row = 0, 5 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("Fixed %d,%d", column, row)
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_Padding()
    IMGUI_DEMO_MARKER("Tables/Padding")
    DemoHelpMarker(
        "We often want outer padding activated when any using features which makes the edges of a column visible:\n" ..
        "e.g.:\n" ..
        "- BorderOuterV\n" ..
        "- any form of row selection\n" ..
        "Because of this, activating BorderOuterV sets the default to PadOuterX. " ..
        "Using PadOuterX or NoPadOuterX you can override the default.\n\n" ..
        "Actual padding values are using style.CellPadding.\n\n" ..
        "In this demo we don't show horizontal borders to emphasize how they don't affect default horizontal padding.")

    local s = ST.padding
    if s == nil then
        s = { flags1 = TF.BordersV, show_headers = false, flags2 = bor(TF.Borders, TF.RowBg), cell_padding = ImVec2(0.0, 0.0),
              show_widget_frame_bg = true, text_bufs = {}, init = true }
        ST.padding = s
    end
    PushStyleCompact()
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_PadOuterX", s.flags1, TF.PadOuterX)
    ImGui.SameLine(); DemoHelpMarker("Enable outer-most padding (default if ImGuiTableFlags_BordersOuterV is set)")
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_NoPadOuterX", s.flags1, TF.NoPadOuterX)
    ImGui.SameLine(); DemoHelpMarker("Disable outer-most padding (default if ImGuiTableFlags_BordersOuterV is not set)")
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_NoPadInnerX", s.flags1, TF.NoPadInnerX)
    ImGui.SameLine(); DemoHelpMarker("Disable inner padding between columns (double inner padding if BordersOuterV is on, single inner padding if BordersOuterV is off)")
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_BordersOuterV", s.flags1, TF.BordersOuterV)
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_BordersInnerV", s.flags1, TF.BordersInnerV)
    _, s.show_headers = ImGui.Checkbox("show_headers", s.show_headers)
    PopStyleCompact()

    if ImGui.BeginTable("table_padding", 3, s.flags1) then
        if s.show_headers then
            ImGui.TableSetupColumn("One")
            ImGui.TableSetupColumn("Two")
            ImGui.TableSetupColumn("Three")
            ImGui.TableHeadersRow()
        end

        for row = 0, 4 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableSetColumnIndex(column)
                if row == 0 then
                    ImGui.Text("Avail %.2f", ImGui.GetContentRegionAvail().x)
                else
                    local buf = string.format("Hello %d,%d", column, row)
                    ImGui.Button(buf, ImVec2(-FLT_MIN, 0.0))
                end
            end
        end
        ImGui.EndTable()
    end

    -- Second example: set style.CellPadding to (0.0) or a custom value.
    DemoHelpMarker("Setting style.CellPadding to (0,0) or a custom value.")

    PushStyleCompact()
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_Borders", s.flags2, TF.Borders)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_BordersH", s.flags2, TF.BordersH)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_BordersV", s.flags2, TF.BordersV)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_BordersInner", s.flags2, TF.BordersInner)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_BordersOuter", s.flags2, TF.BordersOuter)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_RowBg", s.flags2, TF.RowBg)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags2, TF.Resizable)
    _, s.show_widget_frame_bg = ImGui.Checkbox("show_widget_frame_bg", s.show_widget_frame_bg)
    ImGui.SliderFloat2("CellPadding", s.cell_padding, 0.0, 10.0, "%.0f")
    PopStyleCompact()

    ImGui.PushStyleVar(ImGuiStyleVar.CellPadding, s.cell_padding)
    if ImGui.BeginTable("table_padding_2", 3, s.flags2) then
        if not s.show_widget_frame_bg then
            ImGui.PushStyleColor(ImGuiCol.FrameBg, 0)
        end
        for cell = 0, 3 * 5 - 1 do
            ImGui.TableNextColumn()
            if s.init then
                s.text_bufs[cell + 1] = Buf("edit me", 16)
            end
            ImGui.SetNextItemWidth(-FLT_MIN)
            ImGui.PushID(cell)
            ImGui.InputText("##cell", s.text_bufs[cell + 1], 16)
            ImGui.PopID()
        end
        if not s.show_widget_frame_bg then
            ImGui.PopStyleColor()
        end
        s.init = false
        ImGui.EndTable()
    end
    ImGui.PopStyleVar()
end

local function Tables_SizingPolicies()
    IMGUI_DEMO_MARKER("Tables/Explicit widths")
    local s = ST.sizing
    if s == nil then
        s = { flags1 = bor(TF.BordersV, TF.BordersOuterH, TF.RowBg, TF.ContextMenuInBody),
              sizing_policy_flags = { TF.SizingFixedFit, TF.SizingFixedSame, TF.SizingStretchProp, TF.SizingStretchSame },
              flags = bor(TF.ScrollY, TF.Borders, TF.RowBg, TF.Resizable), contents_type = 0, column_count = 3, text_buf = Buf("", 32) }
        ST.sizing = s
    end
    PushStyleCompact()
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags1, TF.Resizable)
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_NoHostExtendX", s.flags1, TF.NoHostExtendX)
    PopStyleCompact()

    for table_n = 0, 3 do
        ImGui.PushID(table_n)
        ImGui.SetNextItemWidth(TEXT_BASE_WIDTH * 30)
        s.sizing_policy_flags[table_n + 1] = EditTableSizingFlags(s.sizing_policy_flags[table_n + 1])

        if ImGui.BeginTable("table1", 3, bor(s.sizing_policy_flags[table_n + 1], s.flags1)) then
            for row = 0, 2 do
                ImGui.TableNextRow()
                ImGui.TableNextColumn(); ImGui.Text("Oh dear")
                ImGui.TableNextColumn(); ImGui.Text("Oh dear")
                ImGui.TableNextColumn(); ImGui.Text("Oh dear")
            end
            ImGui.EndTable()
        end
        if ImGui.BeginTable("table2", 3, bor(s.sizing_policy_flags[table_n + 1], s.flags1)) then
            for row = 0, 2 do
                ImGui.TableNextRow()
                ImGui.TableNextColumn(); ImGui.Text("AAAA")
                ImGui.TableNextColumn(); ImGui.Text("BBBBBBBB")
                ImGui.TableNextColumn(); ImGui.Text("CCCCCCCCCCCC")
            end
            ImGui.EndTable()
        end
        ImGui.PopID()
    end

    ImGui.Spacing()
    ImGui.TextUnformatted("Advanced")
    ImGui.SameLine()
    DemoHelpMarker(
        "This section allows you to interact and see the effect of various sizing policies " ..
        "depending on whether Scroll is enabled and the contents of your columns.")

    local CT_ShowWidth, CT_ShortText, CT_LongText, CT_Button, CT_FillButton, CT_InputText = 0, 1, 2, 3, 4, 5

    PushStyleCompact()
    ImGui.PushID("Advanced")
    ImGui.PushItemWidth(TEXT_BASE_WIDTH * 30)
    s.flags = EditTableSizingFlags(s.flags)
    if ImGui.Combo then
        s.contents_type = ImGui.Combo("Contents", s.contents_type, { "Show width", "Short Text", "Long Text", "Button", "Fill Button", "InputText" }, 6)
    else
        NotPorted("Combo")
    end
    if s.contents_type == CT_FillButton then
        ImGui.SameLine()
        DemoHelpMarker(
            "Be mindful that using right-alignment (e.g. size.x = -FLT_MIN) creates a feedback loop " ..
            "where contents width can feed into auto-column width can feed into contents width.")
    end
    s.column_count = ImGui.DragInt("Columns", s.column_count, 0.1, 1, 64, "%d", ImGuiSliderFlags.AlwaysClamp)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags, TF.Resizable)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_PreciseWidths", s.flags, TF.PreciseWidths)
    ImGui.SameLine(); DemoHelpMarker("Disable distributing remainder width to stretched columns (width allocation on a 100-wide table with 3 columns: Without this flag: 33,33,34. With this flag: 33,33,33). With larger number of columns, resizing will appear to be less smooth.")
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollX", s.flags, TF.ScrollX)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollY", s.flags, TF.ScrollY)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoClip", s.flags, TF.NoClip)
    ImGui.PopItemWidth()
    ImGui.PopID()
    PopStyleCompact()

    if ImGui.BeginTable("table2", s.column_count, s.flags, ImVec2(0.0, TEXT_BASE_HEIGHT * 7)) then
        for cell = 0, 10 * s.column_count - 1 do
            ImGui.TableNextColumn()
            local column = ImGui.TableGetColumnIndex()
            local row = ImGui.TableGetRowIndex()

            ImGui.PushID(cell)
            local label = string.format("Hello %d,%d", column, row)
            local ct = s.contents_type
            if ct == CT_ShortText then ImGui.TextUnformatted(label)
            elseif ct == CT_LongText then ImGui.Text("Some %s text %d,%d\nOver two lines..", column == 0 and "long" or "longeeer", column, row)
            elseif ct == CT_ShowWidth then ImGui.Text("W: %.1f", ImGui.GetContentRegionAvail().x)
            elseif ct == CT_Button then ImGui.Button(label)
            elseif ct == CT_FillButton then ImGui.Button(label, ImVec2(-FLT_MIN, 0.0))
            elseif ct == CT_InputText then ImGui.SetNextItemWidth(-FLT_MIN); ImGui.InputText("##", s.text_buf, 32)
            end
            ImGui.PopID()
        end
        ImGui.EndTable()
    end
end

local function Tables_VerticalScrolling()
    IMGUI_DEMO_MARKER("Tables/Vertical scrolling, with clipping")
    DemoHelpMarker(
        "Here we activate ScrollY, which will create a child window container to allow hosting scrollable contents.\n\n" ..
        "We also demonstrate using ImGuiListClipper to virtualize the submission of many items.")
    local s = ST.vscroll
    if s == nil then s = { flags = bor(TF.ScrollY, TF.RowBg, TF.BordersOuter, TF.BordersV, TF.Resizable, TF.Reorderable, TF.Hideable) }; ST.vscroll = s end

    PushStyleCompact()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollY", s.flags, TF.ScrollY)
    PopStyleCompact()

    local outer_size = ImVec2(0.0, TEXT_BASE_HEIGHT * 8)
    if ImGui.BeginTable("table_scrolly", 3, s.flags, outer_size) then
        ImGui.TableSetupScrollFreeze(0, 1) -- Make top row always visible
        ImGui.TableSetupColumn("One", ImGuiTableColumnFlags.None)
        ImGui.TableSetupColumn("Two", ImGuiTableColumnFlags.None)
        ImGui.TableSetupColumn("Three", ImGuiTableColumnFlags.None)
        ImGui.TableHeadersRow()

        -- Demonstrate using clipper for large vertical lists
        local clipper = ImGuiListClipper()
        clipper:Begin(1000)
        while clipper:Step() do
            for row = clipper.DisplayStart, clipper.DisplayEnd - 1 do
                ImGui.TableNextRow()
                for column = 0, 2 do
                    ImGui.TableSetColumnIndex(column)
                    ImGui.Text("Hello %d,%d", column, row)
                end
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_HorizontalScrolling()
    IMGUI_DEMO_MARKER("Tables/Horizontal scrolling")
    DemoHelpMarker(
        "When ScrollX is enabled, the default sizing policy becomes ImGuiTableFlags_SizingFixedFit, " ..
        "as automatically stretching columns doesn't make much sense with horizontal scrolling.\n\n" ..
        "Also note that as of the current version, you will almost always want to enable ScrollY along with ScrollX, " ..
        "because the container window won't automatically extend vertically to fix contents " ..
        "(this may be improved in future versions).")
    local s = ST.hscroll
    if s == nil then
        s = { flags = bor(TF.ScrollX, TF.ScrollY, TF.RowBg, TF.BordersOuter, TF.BordersV, TF.Resizable, TF.Reorderable, TF.Hideable),
              freeze_cols = 1, freeze_rows = 1,
              flags2 = bor(TF.SizingStretchSame, TF.ScrollX, TF.ScrollY, TF.BordersOuter, TF.RowBg, TF.ContextMenuInBody), inner_width = 1000.0 }
        ST.hscroll = s
    end

    PushStyleCompact()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags, TF.Resizable)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollX", s.flags, TF.ScrollX)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollY", s.flags, TF.ScrollY)
    ImGui.SetNextItemWidth(ImGui.GetFrameHeight())
    s.freeze_cols = ImGui.DragInt("freeze_cols", s.freeze_cols, 0.2, 0, 9, nil, ImGuiSliderFlags.NoInput)
    ImGui.SetNextItemWidth(ImGui.GetFrameHeight())
    s.freeze_rows = ImGui.DragInt("freeze_rows", s.freeze_rows, 0.2, 0, 9, nil, ImGuiSliderFlags.NoInput)
    PopStyleCompact()

    local outer_size = ImVec2(0.0, TEXT_BASE_HEIGHT * 8)
    if ImGui.BeginTable("table_scrollx", 7, s.flags, outer_size) then
        ImGui.TableSetupScrollFreeze(s.freeze_cols, s.freeze_rows)
        ImGui.TableSetupColumn("Line #", ImGuiTableColumnFlags.NoHide) -- Make the first column not hideable to match our use of TableSetupScrollFreeze()
        ImGui.TableSetupColumn("One")
        ImGui.TableSetupColumn("Two")
        ImGui.TableSetupColumn("Three")
        ImGui.TableSetupColumn("Four")
        ImGui.TableSetupColumn("Five")
        ImGui.TableSetupColumn("Six")
        ImGui.TableHeadersRow()
        for row = 0, 19 do
            ImGui.TableNextRow()
            for column = 0, 6 do repeat
                if not ImGui.TableSetColumnIndex(column) and column > 0 then
                    break -- continue
                end
                if column == 0 then
                    ImGui.Text("Line %d", row)
                else
                    ImGui.Text("Hello world %d,%d", column, row)
                end
            until true end
        end
        ImGui.EndTable()
    end

    ImGui.Spacing()
    ImGui.TextUnformatted("Stretch + ScrollX")
    ImGui.SameLine()
    DemoHelpMarker(
        "Showcase using Stretch columns + ScrollX together: " ..
        "this is rather unusual and only makes sense when specifying an 'inner_width' for the table!\n" ..
        "Without an explicit value, inner_width is == outer_size.x and therefore using Stretch columns " ..
        "along with ScrollX doesn't make sense.")
    PushStyleCompact()
    ImGui.PushID("flags3")
    ImGui.PushItemWidth(TEXT_BASE_WIDTH * 30)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollX", s.flags2, TF.ScrollX)
    s.inner_width = ImGui.DragFloat("inner_width", s.inner_width, 1.0, 0.0, FLT_MAX, "%.1f")
    ImGui.PopItemWidth()
    ImGui.PopID()
    PopStyleCompact()
    if ImGui.BeginTable("table2", 7, s.flags2, outer_size, s.inner_width) then
        for cell = 0, 20 * 7 - 1 do
            ImGui.TableNextColumn()
            ImGui.Text("Hello world %d,%d", ImGui.TableGetColumnIndex(), ImGui.TableGetRowIndex())
        end
        ImGui.EndTable()
    end
end

local function Tables_ColumnsFlags()
    IMGUI_DEMO_MARKER("Tables/Columns flags")
    local column_count = 3
    local column_names = { "One", "Two", "Three" }
    local s = ST.colflags
    if s == nil then
        s = { column_flags = { ImGuiTableColumnFlags.DefaultSort, ImGuiTableColumnFlags.None, ImGuiTableColumnFlags.DefaultHide }, column_flags_out = { 0, 0, 0 } }
        ST.colflags = s
    end

    if ImGui.BeginTable("table_columns_flags_checkboxes", column_count, ImGuiTableFlags.None) then
        PushStyleCompact()
        for column = 1, column_count do
            ImGui.TableNextColumn()
            ImGui.PushID(column - 1)
            ImGui.AlignTextToFramePadding() -- FIXME-TABLE: Workaround for wrong text baseline propagation across columns
            ImGui.Text("'%s'", column_names[column])
            ImGui.Spacing()
            ImGui.Text("Input flags:")
            s.column_flags[column] = EditTableColumnsFlags(s.column_flags[column])
            ImGui.Spacing()
            ImGui.Text("Output flags:")
            ImGui.BeginDisabled()
            ShowTableColumnsStatusFlags(s.column_flags_out[column])
            ImGui.EndDisabled()
            ImGui.PopID()
        end
        PopStyleCompact()
        ImGui.EndTable()
    end

    local flags = bor(TF.SizingFixedFit, TF.ScrollX, TF.ScrollY, TF.RowBg, TF.BordersOuter, TF.BordersV, TF.Resizable, TF.Reorderable, TF.Hideable, TF.Sortable)
    local outer_size = ImVec2(0.0, TEXT_BASE_HEIGHT * 9)
    if ImGui.BeginTable("table_columns_flags", column_count, flags, outer_size) then
        local has_angled_header = false
        for column = 1, column_count do
            has_angled_header = has_angled_header or Has(s.column_flags[column], ImGuiTableColumnFlags.AngledHeader)
            ImGui.TableSetupColumn(column_names[column], s.column_flags[column])
        end
        if has_angled_header then
            ImGui.TableAngledHeadersRow()
        end
        ImGui.TableHeadersRow()
        for column = 1, column_count do
            s.column_flags_out[column] = ImGui.TableGetColumnFlags(column - 1)
        end
        local indent_step = math.floor(math.floor(TEXT_BASE_WIDTH) / 2)
        for row = 0, 7 do
            -- Add some indentation to demonstrate usage of per-column IndentEnable/IndentDisable flags.
            ImGui.Indent(indent_step)
            ImGui.TableNextRow()
            for column = 0, column_count - 1 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("%s %s", (column == 0) and "Indented" or "Hello", ImGui.TableGetColumnName(column))
            end
        end
        ImGui.Unindent(indent_step * 8.0)

        ImGui.EndTable()
    end
end

local function Tables_ColumnsWidths()
    IMGUI_DEMO_MARKER("Tables/Columns widths")
    DemoHelpMarker("Using TableSetupColumn() to setup default width.")
    local s = ST.colwidths
    if s == nil then s = { flags1 = bor(TF.Borders, TF.NoBordersInBodyUntilResize), flags2 = TF.None }; ST.colwidths = s end
    local CF = ImGuiTableColumnFlags

    PushStyleCompact()
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags1, TF.Resizable)
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_NoBordersInBodyUntilResize", s.flags1, TF.NoBordersInBodyUntilResize)
    PopStyleCompact()
    if ImGui.BeginTable("table1", 3, s.flags1) then
        ImGui.TableSetupColumn("one", CF.WidthFixed, 100.0) -- Default to 100.0f
        ImGui.TableSetupColumn("two", CF.WidthFixed, 200.0) -- Default to 200.0f
        ImGui.TableSetupColumn("three", CF.WidthFixed)      -- Default to auto
        ImGui.TableHeadersRow()
        for row = 0, 3 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableSetColumnIndex(column)
                if row == 0 then
                    ImGui.Text("(w: %5.1f)", ImGui.GetContentRegionAvail().x)
                else
                    ImGui.Text("Hello %d,%d", column, row)
                end
            end
        end
        ImGui.EndTable()
    end

    DemoHelpMarker(
        "Using TableSetupColumn() to setup explicit width.\n\nUnless _NoKeepColumnsVisible is set, " ..
        "fixed columns with set width may still be shrunk down if there's not enough space in the host.")

    PushStyleCompact()
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_NoKeepColumnsVisible", s.flags2, TF.NoKeepColumnsVisible)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_BordersInnerV", s.flags2, TF.BordersInnerV)
    _, s.flags2 = ImGui.CheckboxFlags("ImGuiTableFlags_BordersOuterV", s.flags2, TF.BordersOuterV)
    PopStyleCompact()
    if ImGui.BeginTable("table2", 4, s.flags2) then
        ImGui.TableSetupColumn("", CF.WidthFixed, 100.0)
        ImGui.TableSetupColumn("", CF.WidthFixed, TEXT_BASE_WIDTH * 15.0)
        ImGui.TableSetupColumn("", CF.WidthFixed, TEXT_BASE_WIDTH * 30.0)
        ImGui.TableSetupColumn("", CF.WidthFixed, TEXT_BASE_WIDTH * 15.0)
        for row = 0, 4 do
            ImGui.TableNextRow()
            for column = 0, 3 do
                ImGui.TableSetColumnIndex(column)
                if row == 0 then
                    ImGui.Text("(w: %5.1f)", ImGui.GetContentRegionAvail().x)
                else
                    ImGui.Text("Hello %d,%d", column, row)
                end
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_Nested()
    IMGUI_DEMO_MARKER("Tables/Nested tables")
    DemoHelpMarker("This demonstrates embedding a table into another table cell.")

    if ImGui.BeginTable("table_nested1", 2, bor(TF.Borders, TF.Resizable, TF.Reorderable, TF.Hideable)) then
        ImGui.TableSetupColumn("A0")
        ImGui.TableSetupColumn("A1")
        ImGui.TableHeadersRow()

        ImGui.TableNextColumn()
        ImGui.Text("A0 Row 0")
        do
            local rows_height = (TEXT_BASE_HEIGHT * 2.0) + (ImGui.GetStyle().CellPadding.y * 2.0)
            if ImGui.BeginTable("table_nested2", 2, bor(TF.Borders, TF.Resizable, TF.Reorderable, TF.Hideable)) then
                ImGui.TableSetupColumn("B0")
                ImGui.TableSetupColumn("B1")
                ImGui.TableHeadersRow()

                ImGui.TableNextRow(ImGuiTableRowFlags.None, rows_height)
                ImGui.TableNextColumn()
                ImGui.Text("B0 Row 0")
                ImGui.TableNextColumn()
                ImGui.Text("B1 Row 0")
                ImGui.TableNextRow(ImGuiTableRowFlags.None, rows_height)
                ImGui.TableNextColumn()
                ImGui.Text("B0 Row 1")
                ImGui.TableNextColumn()
                ImGui.Text("B1 Row 1")

                ImGui.EndTable()
            end
        end
        ImGui.TableNextColumn(); ImGui.Text("A1 Row 0")
        ImGui.TableNextColumn(); ImGui.Text("A0 Row 1")
        ImGui.TableNextColumn(); ImGui.Text("A1 Row 1")
        ImGui.EndTable()
    end
end

local function Tables_RowHeight()
    IMGUI_DEMO_MARKER("Tables/Row height")
    DemoHelpMarker(
        "You can pass a 'min_row_height' to TableNextRow().\n\nRows are padded with 'style.CellPadding.y' on top and bottom, " ..
        "so effectively the minimum row height will always be >= 'style.CellPadding.y * 2.0f'.\n\n" ..
        "We cannot honor a _maximum_ row height as that would require a unique clipping rectangle per row.")
    if ImGui.BeginTable("table_row_height", 1, TF.Borders) then
        for row = 0, 7 do
            local min_row_height = math.floor(TEXT_BASE_HEIGHT * 0.30 * row + ImGui.GetStyle().CellPadding.y * 2.0)
            ImGui.TableNextRow(ImGuiTableRowFlags.None, min_row_height)
            ImGui.TableNextColumn()
            ImGui.Text("min_row_height = %.2f", min_row_height)
        end
        ImGui.EndTable()
    end

    DemoHelpMarker(
        "Showcase using SameLine(0,0) to share Current Line Height between cells.\n\n" ..
        "Please note that Tables Row Height is not the same thing as Current Line Height, " ..
        "as a table cell may contains multiple lines.")
    if ImGui.BeginTable("table_share_lineheight", 2, TF.Borders) then
        ImGui.TableNextRow()
        ImGui.TableNextColumn()
        ImGui.ColorButton("##1", ImVec4(0.13, 0.26, 0.40, 1.0), ImGuiColorEditFlags.None, ImVec2(40, 40))
        ImGui.TableNextColumn()
        ImGui.Text("Line 1")
        ImGui.Text("Line 2")

        ImGui.TableNextRow()
        ImGui.TableNextColumn()
        ImGui.ColorButton("##2", ImVec4(0.13, 0.26, 0.40, 1.0), ImGuiColorEditFlags.None, ImVec2(40, 40))
        ImGui.TableNextColumn()
        ImGui.SameLine(0.0, 0.0) -- Reuse line height from previous column
        ImGui.Text("Line 1, with SameLine(0,0)")
        ImGui.Text("Line 2")

        ImGui.EndTable()
    end

    DemoHelpMarker("Showcase altering CellPadding.y between rows. Note that CellPadding.x is locked for the entire table.")
    if ImGui.BeginTable("table_changing_cellpadding_y", 1, TF.Borders) then
        local style = ImGui.GetStyle()
        for row = 0, 7 do
            if (row % 3) == 2 then
                ImGui.PushStyleVarY(ImGuiStyleVar.CellPadding, 20.0)
            end
            ImGui.TableNextRow(ImGuiTableRowFlags.None)
            ImGui.TableNextColumn()
            ImGui.Text("CellPadding.y = %.2f", style.CellPadding.y)
            if (row % 3) == 2 then
                ImGui.PopStyleVar()
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_OuterSize()
    IMGUI_DEMO_MARKER("Tables/Outer size")
    ImGui.Text("Using NoHostExtendX and NoHostExtendY:")
    PushStyleCompact()
    local s = ST.outer
    if s == nil then s = { flags = bor(TF.Borders, TF.Resizable, TF.ContextMenuInBody, TF.RowBg, TF.SizingFixedFit, TF.NoHostExtendX) }; ST.outer = s end
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoHostExtendX", s.flags, TF.NoHostExtendX)
    ImGui.SameLine(); DemoHelpMarker("Make outer width auto-fit to columns, overriding outer_size.x value.\n\nOnly available when ScrollX/ScrollY are disabled and Stretch columns are not used.")
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoHostExtendY", s.flags, TF.NoHostExtendY)
    ImGui.SameLine(); DemoHelpMarker("Make outer height stop exactly at outer_size.y (prevent auto-extending table past the limit).\n\nOnly available when ScrollX/ScrollY are disabled. Data below the limit will be clipped and not visible.")
    PopStyleCompact()

    local outer_size = ImVec2(0.0, TEXT_BASE_HEIGHT * 5.5)
    if ImGui.BeginTable("table1", 3, s.flags, outer_size) then
        for row = 0, 9 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableNextColumn()
                ImGui.Text("Cell %d,%d", column, row)
            end
        end
        ImGui.EndTable()
    end
    ImGui.SameLine()
    ImGui.Text("Hello!")

    ImGui.Spacing()

    ImGui.Text("Using explicit size:")
    if ImGui.BeginTable("table2", 3, bor(TF.Borders, TF.RowBg), ImVec2(TEXT_BASE_WIDTH * 30, 0.0)) then
        for row = 0, 4 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                ImGui.TableNextColumn()
                ImGui.Text("Cell %d,%d", column, row)
            end
        end
        ImGui.EndTable()
    end
    ImGui.SameLine()
    if ImGui.BeginTable("table3", 3, bor(TF.Borders, TF.RowBg), ImVec2(TEXT_BASE_WIDTH * 30, 0.0)) then
        local rows_height = TEXT_BASE_HEIGHT * 1.5 + ImGui.GetStyle().CellPadding.y * 2.0
        for row = 0, 2 do
            ImGui.TableNextRow(0, rows_height)
            for column = 0, 2 do
                ImGui.TableNextColumn()
                ImGui.Text("Cell %d,%d", column, row)
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_BackgroundColor()
    IMGUI_DEMO_MARKER("Tables/Background color")
    local s = ST.bgcolor
    if s == nil then s = { flags = TF.RowBg, row_bg_type = 1, row_bg_target = 1, cell_bg_type = 1 }; ST.bgcolor = s end

    PushStyleCompact()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Borders", s.flags, TF.Borders)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_RowBg", s.flags, TF.RowBg)
    ImGui.SameLine(); DemoHelpMarker("ImGuiTableFlags_RowBg automatically sets RowBg0 to alternative colors pulled from the Style.")
    if ImGui.Combo then
        s.row_bg_type = ImGui.Combo("row bg type", s.row_bg_type, { "None", "Red", "Gradient" }, 3)
        s.row_bg_target = ImGui.Combo("row bg target", s.row_bg_target, { "RowBg0", "RowBg1" }, 2); ImGui.SameLine(); DemoHelpMarker("Target RowBg0 to override the alternating odd/even colors,\nTarget RowBg1 to blend with them.")
        s.cell_bg_type = ImGui.Combo("cell bg type", s.cell_bg_type, { "None", "Blue" }, 2); ImGui.SameLine(); DemoHelpMarker("We are colorizing cells to B1->C2 here.")
    else
        NotPorted("Combo")
    end
    IM_ASSERT(s.row_bg_type >= 0 and s.row_bg_type <= 2)
    IM_ASSERT(s.row_bg_target >= 0 and s.row_bg_target <= 1)
    IM_ASSERT(s.cell_bg_type >= 0 and s.cell_bg_type <= 1)
    PopStyleCompact()

    if ImGui.BeginTable("table1", 5, s.flags) then
        for row = 0, 5 do
            ImGui.TableNextRow()

            if s.row_bg_type ~= 0 then
                local row_bg_color = ImGui.GetColorU32(s.row_bg_type == 1 and ImVec4(0.7, 0.3, 0.3, 0.65) or ImVec4(0.2 + row * 0.1, 0.2, 0.2, 0.65)) -- Flat or Gradient?
                ImGui.TableSetBgColor(ImGuiTableBgTarget.RowBg0 + s.row_bg_target, row_bg_color)
            end

            -- Fill cells
            for column = 0, 4 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("%s%s", string.char(65 + row), string.char(48 + column))

                if row >= 1 and row <= 2 and column >= 1 and column <= 2 and s.cell_bg_type == 1 then
                    local cell_bg_color = ImGui.GetColorU32(ImVec4(0.3, 0.3, 0.7, 0.65))
                    ImGui.TableSetBgColor(ImGuiTableBgTarget.CellBg, cell_bg_color)
                end
            end
        end
        ImGui.EndTable()
    end
end

local tree_view_nodes = {
    { Name = "Root with Long Name",           Type = "Folder",      Size = -1,     ChildIdx = 1,  ChildCount = 3  }, -- 0
    { Name = "Music",                         Type = "Folder",      Size = -1,     ChildIdx = 4,  ChildCount = 2  }, -- 1
    { Name = "Textures",                      Type = "Folder",      Size = -1,     ChildIdx = 6,  ChildCount = 3  }, -- 2
    { Name = "desktop.ini",                   Type = "System file", Size = 1024,   ChildIdx = -1, ChildCount = -1 }, -- 3
    { Name = "File1_a.wav",                   Type = "Audio file",  Size = 123000, ChildIdx = -1, ChildCount = -1 }, -- 4
    { Name = "File1_b.wav",                   Type = "Audio file",  Size = 456000, ChildIdx = -1, ChildCount = -1 }, -- 5
    { Name = "Image001.png",                  Type = "Image file",  Size = 203128, ChildIdx = -1, ChildCount = -1 }, -- 6
    { Name = "Copy of Image001.png",          Type = "Image file",  Size = 203256, ChildIdx = -1, ChildCount = -1 }, -- 7
    { Name = "Copy of Image001 (Final2).png", Type = "Image file",  Size = 203512, ChildIdx = -1, ChildCount = -1 }, -- 8
}

local function MyTreeNode_DisplayNode(node, all_nodes, tree_node_flags_base)
    ImGui.TableNextRow()
    ImGui.TableNextColumn()
    local is_folder = (node.ChildCount > 0)

    local node_flags = tree_node_flags_base
    if node ~= all_nodes[1] then
        node_flags = bit32.band(node_flags, bit32.bnot(ImGuiTreeNodeFlags.LabelSpanAllColumns)) -- Only demonstrate this on the root node.
    end

    if is_folder then
        local open = ImGui.TreeNodeEx(node.Name, node_flags)
        if bit32.band(node_flags, ImGuiTreeNodeFlags.LabelSpanAllColumns) == 0 then
            ImGui.TableNextColumn()
            ImGui.TextDisabled("--")
            ImGui.TableNextColumn()
            ImGui.TextUnformatted(node.Type)
        end
        if open then
            for child_n = 0, node.ChildCount - 1 do
                MyTreeNode_DisplayNode(all_nodes[node.ChildIdx + child_n + 1], all_nodes, tree_node_flags_base)
            end
            ImGui.TreePop()
        end
    else
        ImGui.TreeNodeEx(node.Name, bor(node_flags, ImGuiTreeNodeFlags.Leaf, ImGuiTreeNodeFlags.Bullet, ImGuiTreeNodeFlags.NoTreePushOnOpen))
        ImGui.TableNextColumn()
        ImGui.Text("%d", node.Size)
        ImGui.TableNextColumn()
        ImGui.TextUnformatted(node.Type)
    end
end

local function Tables_TreeView()
    IMGUI_DEMO_MARKER("Tables/Tree view")
    local s = ST.treeview
    if s == nil then
        s = { table_flags = bor(TF.BordersV, TF.BordersOuterH, TF.Resizable, TF.RowBg, TF.NoBordersInBody),
              tree_node_flags_base = bor(ImGuiTreeNodeFlags.SpanAllColumns, ImGuiTreeNodeFlags.DefaultOpen, ImGuiTreeNodeFlags.DrawLinesFull) }
        ST.treeview = s
    end
    _, s.tree_node_flags_base = ImGui.CheckboxFlags("ImGuiTreeNodeFlags_SpanFullWidth", s.tree_node_flags_base, ImGuiTreeNodeFlags.SpanFullWidth)
    _, s.tree_node_flags_base = ImGui.CheckboxFlags("ImGuiTreeNodeFlags_SpanLabelWidth", s.tree_node_flags_base, ImGuiTreeNodeFlags.SpanLabelWidth)
    _, s.tree_node_flags_base = ImGui.CheckboxFlags("ImGuiTreeNodeFlags_SpanAllColumns", s.tree_node_flags_base, ImGuiTreeNodeFlags.SpanAllColumns)
    _, s.tree_node_flags_base = ImGui.CheckboxFlags("ImGuiTreeNodeFlags_LabelSpanAllColumns", s.tree_node_flags_base, ImGuiTreeNodeFlags.LabelSpanAllColumns)
    ImGui.SameLine(); DemoHelpMarker("Useful if you know that you aren't displaying contents in other columns")

    DemoHelpMarker("See \"Columns flags\" section to configure how indentation is applied to individual columns.")
    if ImGui.BeginTable("3ways", 3, s.table_flags) then
        ImGui.TableSetupColumn("Name", ImGuiTableColumnFlags.NoHide)
        ImGui.TableSetupColumn("Size", ImGuiTableColumnFlags.WidthFixed, TEXT_BASE_WIDTH * 12.0)
        ImGui.TableSetupColumn("Type", ImGuiTableColumnFlags.WidthFixed, TEXT_BASE_WIDTH * 18.0)
        ImGui.TableHeadersRow()

        MyTreeNode_DisplayNode(tree_view_nodes[1], tree_view_nodes, s.tree_node_flags_base)

        ImGui.EndTable()
    end
end

local function Tables_ItemWidth()
    IMGUI_DEMO_MARKER("Tables/Item width")
    DemoHelpMarker(
        "Showcase using PushItemWidth() and how it is preserved on a per-column basis.\n\n" ..
        "Note that on auto-resizing non-resizable fixed columns, querying the content width for " ..
        "e.g. right-alignment doesn't make sense.")
    if ImGui.BeginTable("table_item_width", 3, TF.Borders) then
        ImGui.TableSetupColumn("small")
        ImGui.TableSetupColumn("half")
        ImGui.TableSetupColumn("right-align")
        ImGui.TableHeadersRow()

        for row = 0, 2 do
            ImGui.TableNextRow()
            if row == 0 then
                -- Setup ItemWidth once (instead of setting up every time, which is also possible but less efficient)
                ImGui.TableSetColumnIndex(0)
                ImGui.PushItemWidth(TEXT_BASE_WIDTH * 3.0) -- Small
                ImGui.TableSetColumnIndex(1)
                ImGui.PushItemWidth(-ImGui.GetContentRegionAvail().x * 0.5)
                ImGui.TableSetColumnIndex(2)
                ImGui.PushItemWidth(-FLT_MIN) -- Right-aligned
            end

            -- Draw our contents
            ImGui.PushID(row)
            ImGui.TableSetColumnIndex(0)
            ST.dummy_f = ImGui.SliderFloat("float0", ST.dummy_f or 0.0, 0.0, 1.0)
            ImGui.TableSetColumnIndex(1)
            ST.dummy_f = ImGui.SliderFloat("float1", ST.dummy_f, 0.0, 1.0)
            ImGui.TableSetColumnIndex(2)
            ST.dummy_f = ImGui.SliderFloat("##float2", ST.dummy_f, 0.0, 1.0) -- No visible label since right-aligned
            ImGui.PopID()
        end
        ImGui.EndTable()
    end
end

local function Tables_CustomHeaders()
    IMGUI_DEMO_MARKER("Tables/Custom headers")
    local COLUMNS_COUNT = 3
    if ImGui.BeginTable("table_custom_headers", COLUMNS_COUNT, bor(TF.Borders, TF.Reorderable, TF.Hideable)) then
        ImGui.TableSetupColumn("Apricot")
        ImGui.TableSetupColumn("Banana")
        ImGui.TableSetupColumn("Cherry")

        -- Dummy entire-column selection storage
        if ST.column_selected == nil then ST.column_selected = { false, false, false } end
        local column_selected = ST.column_selected

        ImGui.TableNextRow(ImGuiTableRowFlags.Headers)
        for column = 0, COLUMNS_COUNT - 1 do
            ImGui.TableSetColumnIndex(column)
            local column_name = ImGui.TableGetColumnName(column) -- Retrieve name passed to TableSetupColumn()
            ImGui.PushID(column)
            ImGui.PushStyleVar(ImGuiStyleVar.FramePadding, ImVec2(0, 0))
            _, column_selected[column + 1] = ImGui.Checkbox("##checkall", column_selected[column + 1])
            ImGui.PopStyleVar()
            ImGui.SameLine(0.0, ImGui.GetStyle().ItemInnerSpacing.x)
            ImGui.TableHeader(column_name)
            ImGui.PopID()
        end

        -- Submit table contents
        for row = 0, 4 do
            ImGui.TableNextRow()
            for column = 0, 2 do
                local buf = string.format("Cell %d,%d", column, row)
                ImGui.TableSetColumnIndex(column)
                ImGui.Selectable(buf, column_selected[column + 1])
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_AngledHeaders()
    IMGUI_DEMO_MARKER("Tables/Angled headers")
    local column_names = { "Track", "cabasa", "ride", "smash", "tom-hi", "tom-mid", "tom-low", "hihat-o", "hihat-c", "snare-s", "snare-c", "clap", "rim", "kick" }
    local columns_count = #column_names
    local rows_count = 12

    local s = ST.angled
    if s == nil then
        s = { table_flags = bor(TF.SizingFixedFit, TF.ScrollX, TF.ScrollY, TF.BordersOuter, TF.BordersInnerH, TF.Hideable, TF.Resizable, TF.Reorderable, TF.HighlightHoveredColumn),
              column_flags = bor(ImGuiTableColumnFlags.AngledHeader, ImGuiTableColumnFlags.WidthFixed),
              bools = {}, frozen_cols = 1, frozen_rows = 2 }
        for i = 1, columns_count * rows_count do s.bools[i] = false end
        ST.angled = s
    end
    _, s.table_flags = ImGui.CheckboxFlags("_ScrollX", s.table_flags, TF.ScrollX)
    _, s.table_flags = ImGui.CheckboxFlags("_ScrollY", s.table_flags, TF.ScrollY)
    _, s.table_flags = ImGui.CheckboxFlags("_Resizable", s.table_flags, TF.Resizable)
    _, s.table_flags = ImGui.CheckboxFlags("_Sortable", s.table_flags, TF.Sortable)
    _, s.table_flags = ImGui.CheckboxFlags("_NoBordersInBody", s.table_flags, TF.NoBordersInBody)
    _, s.table_flags = ImGui.CheckboxFlags("_HighlightHoveredColumn", s.table_flags, TF.HighlightHoveredColumn)
    ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
    s.frozen_cols = ImGui.SliderInt("Frozen columns", s.frozen_cols, 0, 2)
    ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
    s.frozen_rows = ImGui.SliderInt("Frozen rows", s.frozen_rows, 0, 2)
    _, s.column_flags = ImGui.CheckboxFlags("Disable header contributing to column width", s.column_flags, ImGuiTableColumnFlags.NoHeaderWidth)

    if ImGui.TreeNode("Style settings") then
        ImGui.SameLine()
        DemoHelpMarker("Giving access to some ImGuiStyle value in this demo for convenience.")
        ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
        local style = ImGui.GetStyle()
        style.TableAngledHeadersAngle = ImGui.SliderAngle("style.TableAngledHeadersAngle", style.TableAngledHeadersAngle, -50.0, 50.0)
        ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
        ImGui.SliderFloat2("style.TableAngledHeadersTextAlign", style.TableAngledHeadersTextAlign, 0.0, 1.0, "%.2f")
        ImGui.TreePop()
    end

    if ImGui.BeginTable("table_angled_headers", columns_count, s.table_flags, ImVec2(0.0, TEXT_BASE_HEIGHT * 12)) then
        ImGui.TableSetupColumn(column_names[1], bor(ImGuiTableColumnFlags.NoHide, ImGuiTableColumnFlags.NoReorder))
        for n = 2, columns_count do
            ImGui.TableSetupColumn(column_names[n], s.column_flags)
        end
        ImGui.TableSetupScrollFreeze(s.frozen_cols, s.frozen_rows)

        ImGui.TableAngledHeadersRow() -- Draw angled headers for all columns with the ImGuiTableColumnFlags_AngledHeader flag.
        ImGui.TableHeadersRow()       -- Draw remaining headers and allow access to context-menu and other functions.
        for row = 0, rows_count - 1 do
            ImGui.PushID(row)
            ImGui.TableNextRow()
            ImGui.TableSetColumnIndex(0)
            ImGui.AlignTextToFramePadding()
            ImGui.Text("Track %d", row)
            for column = 1, columns_count - 1 do
                if ImGui.TableSetColumnIndex(column) then
                    ImGui.PushID(column)
                    local idx = row * columns_count + column + 1
                    _, s.bools[idx] = ImGui.Checkbox("", s.bools[idx])
                    ImGui.PopID()
                end
            end
            ImGui.PopID()
        end
        ImGui.EndTable()
    end
end

local function Tables_ContextMenus()
    IMGUI_DEMO_MARKER("Tables/Context menus")
    DemoHelpMarker(
        "By default, right-clicking over a TableHeadersRow()/TableHeader() line will open the default context-menu.\n" ..
        "Using ImGuiTableFlags_ContextMenuInBody we also allow right-clicking over columns body.")
    local s = ST.ctxmenu
    if s == nil then s = { flags1 = bor(TF.Resizable, TF.Reorderable, TF.Hideable, TF.Borders, TF.ContextMenuInBody) }; ST.ctxmenu = s end

    PushStyleCompact()
    _, s.flags1 = ImGui.CheckboxFlags("ImGuiTableFlags_ContextMenuInBody", s.flags1, TF.ContextMenuInBody)
    PopStyleCompact()

    local COLUMNS_COUNT = 3
    if ImGui.BeginTable("table_context_menu", COLUMNS_COUNT, s.flags1) then
        ImGui.TableSetupColumn("One")
        ImGui.TableSetupColumn("Two")
        ImGui.TableSetupColumn("Three")

        -- [1.1]] Right-click on the TableHeadersRow() line to open the default table context menu.
        ImGui.TableHeadersRow()

        -- Submit dummy contents
        for row = 0, 3 do
            ImGui.TableNextRow()
            for column = 0, COLUMNS_COUNT - 1 do
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("Cell %d,%d", column, row)
            end
        end
        ImGui.EndTable()
    end

    DemoHelpMarker(
        "Demonstrate mixing table context menu (over header), item context button (over button) " ..
        "and custom per-column context menu (over column body).")
    local flags2 = bor(TF.Resizable, TF.SizingFixedFit, TF.Reorderable, TF.Hideable, TF.Borders)
    if ImGui.BeginTable("table_context_menu_2", COLUMNS_COUNT, flags2) then
        ImGui.TableSetupColumn("One")
        ImGui.TableSetupColumn("Two")
        ImGui.TableSetupColumn("Three")

        -- [2.1] Right-click on the TableHeadersRow() line to open the default table context menu.
        ImGui.TableHeadersRow()
        for row = 0, 3 do
            ImGui.TableNextRow()
            for column = 0, COLUMNS_COUNT - 1 do
                -- Submit dummy contents
                ImGui.TableSetColumnIndex(column)
                ImGui.Text("Cell %d,%d", column, row)
                ImGui.SameLine()

                -- [2.2] Right-click on the ".." to open a custom popup
                ImGui.PushID(row * COLUMNS_COUNT + column)
                ImGui.SmallButton("..")
                if ImGui.BeginPopupContextItem() then
                    ImGui.Text("This is the popup for Button(\"..\") in Cell %d,%d", column, row)
                    if ImGui.Button("Close") then
                        ImGui.CloseCurrentPopup()
                    end
                    ImGui.EndPopup()
                end
                ImGui.PopID()
            end
        end

        -- [2.3] Right-click anywhere in columns to open another custom popup
        local hovered_column = -1
        for column = 0, COLUMNS_COUNT do
            ImGui.PushID(column)
            if Has(ImGui.TableGetColumnFlags(column), ImGuiTableColumnFlags.IsHovered) then
                hovered_column = column
            end
            if hovered_column == column and not ImGui.IsAnyItemHovered() and ImGui.IsMouseReleased(1) then
                ImGui.OpenPopup("MyPopup")
            end
            if ImGui.BeginPopup("MyPopup") then
                if column == COLUMNS_COUNT then
                    ImGui.Text("This is a custom popup for unused space after the last column.")
                else
                    ImGui.Text("This is a custom popup for Column %d", column)
                end
                if ImGui.Button("Close") then
                    ImGui.CloseCurrentPopup()
                end
                ImGui.EndPopup()
            end
            ImGui.PopID()
        end

        ImGui.EndTable()
        ImGui.Text("Hovered column: %d", hovered_column)
    end
end

local function Tables_SyncedInstances()
    IMGUI_DEMO_MARKER("Tables/Synced instances")
    DemoHelpMarker("Multiple tables with the same identifier will share their settings, width, visibility, order etc.")

    local s = ST.synced
    if s == nil then s = { flags = bor(TF.Resizable, TF.Reorderable, TF.Hideable, TF.Borders, TF.SizingFixedFit, TF.NoSavedSettings) }; ST.synced = s end
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags, TF.Resizable)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollY", s.flags, TF.ScrollY)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_SizingFixedFit", s.flags, TF.SizingFixedFit)
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_HighlightHoveredColumn", s.flags, TF.HighlightHoveredColumn)
    for n = 0, 2 do
        local buf = string.format("Synced Table %d", n)
        local open = ImGui.CollapsingHeader(buf, ImGuiTreeNodeFlags.DefaultOpen)
        if open and ImGui.BeginTable("Table", 3, s.flags, ImVec2(0.0, ImGui.GetTextLineHeightWithSpacing() * 5)) then
            ImGui.TableSetupColumn("One")
            ImGui.TableSetupColumn("Two")
            ImGui.TableSetupColumn("Three")
            ImGui.TableHeadersRow()
            local cell_count = (n == 1) and 27 or 9 -- Make second table have a scrollbar to verify that additional decoration is not affecting column positions.
            for cell = 0, cell_count - 1 do
                ImGui.TableNextColumn()
                ImGui.Text("this cell %d", cell)
            end
            ImGui.EndTable()
        end
    end
end

local template_items_names = {
    "Banana", "Apple", "Cherry", "Watermelon", "Grapefruit", "Strawberry", "Mango",
    "Kiwi", "Orange", "Pineapple", "Blueberry", "Plum", "Coconut", "Pear", "Apricot"
}

local function Tables_Sorting()
    IMGUI_DEMO_MARKER("Tables/Sorting")
    local s = ST.sorting
    if s == nil then
        s = { items = {},
              flags = bor(TF.Resizable, TF.Reorderable, TF.Hideable, TF.Sortable, TF.SortMulti, TF.RowBg, TF.BordersOuter, TF.BordersV, TF.NoBordersInBody, TF.ScrollY) }
        for n = 0, 49 do
            local template_n = n % #template_items_names
            s.items[n + 1] = MyItem(n, template_items_names[template_n + 1], (n * n - n) % 20) -- Assign default quantities
        end
        ST.sorting = s
    end
    local items = s.items

    PushStyleCompact()
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_SortMulti", s.flags, TF.SortMulti)
    ImGui.SameLine(); DemoHelpMarker("When sorting is enabled: hold shift when clicking headers to sort on multiple column. TableGetSortSpecs() may return specs where (SpecsCount > 1).")
    _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_SortTristate", s.flags, TF.SortTristate)
    ImGui.SameLine(); DemoHelpMarker("When sorting is enabled: allow no sorting, disable default sorting. TableGetSortSpecs() may return specs where (SpecsCount == 0).")
    PopStyleCompact()

    if ImGui.BeginTable("table_sorting", 4, s.flags, ImVec2(0.0, TEXT_BASE_HEIGHT * 15), 0.0) then
        local CF = ImGuiTableColumnFlags
        ImGui.TableSetupColumn("ID",       bor(CF.DefaultSort, CF.WidthFixed),            0.0, MyItemColumnID_ID)
        ImGui.TableSetupColumn("Name",     CF.WidthFixed,                                 0.0, MyItemColumnID_Name)
        ImGui.TableSetupColumn("Action",   bor(CF.NoSort, CF.WidthFixed),                 0.0, MyItemColumnID_Action)
        ImGui.TableSetupColumn("Quantity", bor(CF.PreferSortDescending, CF.WidthStretch), 0.0, MyItemColumnID_Quantity)
        ImGui.TableSetupScrollFreeze(0, 1) -- Make row always visible
        ImGui.TableHeadersRow()

        -- Sort our data if sort specs have been changed!
        local sort_specs = ImGui.TableGetSortSpecs()
        if sort_specs and sort_specs.SpecsDirty then
            MyItem_SortWithSortSpecs(sort_specs, items, #items)
            sort_specs.SpecsDirty = false
        end

        -- Demonstrate using clipper for large vertical lists
        local clipper = ImGuiListClipper()
        clipper:Begin(#items)
        while clipper:Step() do
            for row_n = clipper.DisplayStart, clipper.DisplayEnd - 1 do
                -- Display a data item
                local item = items[row_n + 1]
                ImGui.PushID(item.ID)
                ImGui.TableNextRow()
                ImGui.TableNextColumn()
                ImGui.Text("%04d", item.ID)
                ImGui.TableNextColumn()
                ImGui.TextUnformatted(item.Name)
                ImGui.TableNextColumn()
                ImGui.SmallButton("None")
                ImGui.TableNextColumn()
                ImGui.Text("%d", item.Quantity)
                ImGui.PopID()
            end
        end
        ImGui.EndTable()
    end
end

local function Tables_AdvancedOptions(s)
    -- Make the UI compact because there are so many fields
    PushStyleCompact()
    ImGui.PushItemWidth(TEXT_BASE_WIDTH * 28.0)

    if ImGui.TreeNodeEx("Features:", ImGuiTreeNodeFlags.DefaultOpen) then
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Resizable", s.flags, TF.Resizable)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Reorderable", s.flags, TF.Reorderable)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Hideable", s.flags, TF.Hideable)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_Sortable", s.flags, TF.Sortable)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoSavedSettings", s.flags, TF.NoSavedSettings)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ContextMenuInBody", s.flags, TF.ContextMenuInBody)
        ImGui.TreePop()
    end

    if ImGui.TreeNodeEx("Decorations:", ImGuiTreeNodeFlags.DefaultOpen) then
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_RowBg", s.flags, TF.RowBg)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersV", s.flags, TF.BordersV)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersOuterV", s.flags, TF.BordersOuterV)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersInnerV", s.flags, TF.BordersInnerV)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersH", s.flags, TF.BordersH)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersOuterH", s.flags, TF.BordersOuterH)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_BordersInnerH", s.flags, TF.BordersInnerH)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoBordersInBody", s.flags, TF.NoBordersInBody); ImGui.SameLine(); DemoHelpMarker("Disable vertical borders in columns Body (borders will always appear in Headers)")
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoBordersInBodyUntilResize", s.flags, TF.NoBordersInBodyUntilResize); ImGui.SameLine(); DemoHelpMarker("Disable vertical borders in columns Body until hovered for resize (borders will always appear in Headers)")
        ImGui.TreePop()
    end

    if ImGui.TreeNodeEx("Sizing:", ImGuiTreeNodeFlags.DefaultOpen) then
        s.flags = EditTableSizingFlags(s.flags)
        ImGui.SameLine(); DemoHelpMarker("In the Advanced demo we override the policy of each column so those table-wide settings have less effect that typical.")
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoHostExtendX", s.flags, TF.NoHostExtendX)
        ImGui.SameLine(); DemoHelpMarker("Make outer width auto-fit to columns, overriding outer_size.x value.\n\nOnly available when ScrollX/ScrollY are disabled and Stretch columns are not used.")
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoHostExtendY", s.flags, TF.NoHostExtendY)
        ImGui.SameLine(); DemoHelpMarker("Make outer height stop exactly at outer_size.y (prevent auto-extending table past the limit).\n\nOnly available when ScrollX/ScrollY are disabled. Data below the limit will be clipped and not visible.")
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoKeepColumnsVisible", s.flags, TF.NoKeepColumnsVisible)
        ImGui.SameLine(); DemoHelpMarker("Only available if ScrollX is disabled.")
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_PreciseWidths", s.flags, TF.PreciseWidths)
        ImGui.SameLine(); DemoHelpMarker("Disable distributing remainder width to stretched columns (width allocation on a 100-wide table with 3 columns: Without this flag: 33,33,34. With this flag: 33,33,33). With larger number of columns, resizing will appear to be less smooth.")
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoClip", s.flags, TF.NoClip)
        ImGui.SameLine(); DemoHelpMarker("Disable clipping rectangle for every individual columns (reduce draw command count, items will be able to overflow into other columns). Generally incompatible with ScrollFreeze options.")
        ImGui.TreePop()
    end

    if ImGui.TreeNodeEx("Padding:", ImGuiTreeNodeFlags.DefaultOpen) then
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_PadOuterX", s.flags, TF.PadOuterX)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoPadOuterX", s.flags, TF.NoPadOuterX)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_NoPadInnerX", s.flags, TF.NoPadInnerX)
        ImGui.TreePop()
    end

    if ImGui.TreeNodeEx("Scrolling:", ImGuiTreeNodeFlags.DefaultOpen) then
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollX", s.flags, TF.ScrollX)
        ImGui.SameLine()
        ImGui.SetNextItemWidth(ImGui.GetFrameHeight())
        s.freeze_cols = ImGui.DragInt("freeze_cols", s.freeze_cols, 0.2, 0, 9, nil, ImGuiSliderFlags.NoInput)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_ScrollY", s.flags, TF.ScrollY)
        ImGui.SameLine()
        ImGui.SetNextItemWidth(ImGui.GetFrameHeight())
        s.freeze_rows = ImGui.DragInt("freeze_rows", s.freeze_rows, 0.2, 0, 9, nil, ImGuiSliderFlags.NoInput)
        ImGui.TreePop()
    end

    if ImGui.TreeNodeEx("Sorting:", ImGuiTreeNodeFlags.DefaultOpen) then
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_SortMulti", s.flags, TF.SortMulti)
        ImGui.SameLine(); DemoHelpMarker("When sorting is enabled: hold shift when clicking headers to sort on multiple column. TableGetSortSpecs() may return specs where (SpecsCount > 1).")
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_SortTristate", s.flags, TF.SortTristate)
        ImGui.SameLine(); DemoHelpMarker("When sorting is enabled: allow no sorting, disable default sorting. TableGetSortSpecs() may return specs where (SpecsCount == 0).")
        ImGui.TreePop()
    end

    if ImGui.TreeNodeEx("Headers:", ImGuiTreeNodeFlags.DefaultOpen) then
        _, s.show_headers = ImGui.Checkbox("show_headers", s.show_headers)
        _, s.flags = ImGui.CheckboxFlags("ImGuiTableFlags_HighlightHoveredColumn", s.flags, TF.HighlightHoveredColumn)
        _, s.columns_base_flags = ImGui.CheckboxFlags("ImGuiTableColumnFlags_AngledHeader", s.columns_base_flags, ImGuiTableColumnFlags.AngledHeader)
        ImGui.SameLine(); DemoHelpMarker("Enable AngledHeader on all columns. Best enabled on selected narrow columns (see \"Angled headers\" section of the demo).")
        ImGui.TreePop()
    end

    if ImGui.TreeNodeEx("Other:", ImGuiTreeNodeFlags.DefaultOpen) then
        _, s.show_wrapped_text = ImGui.Checkbox("show_wrapped_text", s.show_wrapped_text)

        ImGui.DragFloat2("##OuterSize", s.outer_size_value)
        ImGui.SameLine(0.0, ImGui.GetStyle().ItemInnerSpacing.x)
        _, s.outer_size_enabled = ImGui.Checkbox("outer_size", s.outer_size_enabled)
        ImGui.SameLine()
        DemoHelpMarker("If scrolling is disabled (ScrollX and ScrollY not set):\n" ..
            "- The table is output directly in the parent window.\n" ..
            "- OuterSize.x < 0.0f will right-align the table.\n" ..
            "- OuterSize.x = 0.0f will narrow fit the table unless there are any Stretch columns.\n" ..
            "- OuterSize.y then becomes the minimum size for the table, which will extend vertically if there are more rows (unless NoHostExtendY is set).")

        s.inner_width_with_scroll = ImGui.DragFloat("inner_width (when ScrollX active)", s.inner_width_with_scroll, 1.0, 0.0, FLT_MAX)

        s.row_min_height = ImGui.DragFloat("row_min_height", s.row_min_height, 1.0, 0.0, FLT_MAX)
        ImGui.SameLine(); DemoHelpMarker("Specify height of the Selectable item.")

        s.items_count = ImGui.DragInt("items_count", s.items_count, 0.1, 0, 9999)
        local contents_type_names = { "Text", "Button", "SmallButton", "FillButton", "Selectable", "Selectable (span row)" }
        if ImGui.Combo then
            s.contents_type = ImGui.Combo("items_type (first column)", s.contents_type, contents_type_names, #contents_type_names)
        else
            NotPorted("Combo")
        end
        ImGui.TreePop()
    end

    ImGui.PopItemWidth()
    PopStyleCompact()
    ImGui.Spacing()
end

local function Tables_Advanced()
    IMGUI_DEMO_MARKER("Tables/Advanced")
    local CT_Text, CT_Button, CT_SmallButton, CT_FillButton, CT_Selectable, CT_SelectableSpanRow = 0, 1, 2, 3, 4, 5
    local s = ST.advanced
    if s == nil then
        s = { flags = bor(TF.Resizable, TF.Reorderable, TF.Hideable, TF.Sortable, TF.SortMulti, TF.RowBg, TF.Borders, TF.NoBordersInBody, TF.ScrollX, TF.ScrollY, TF.SizingFixedFit),
              columns_base_flags = ImGuiTableColumnFlags.None, contents_type = CT_SelectableSpanRow,
              freeze_cols = 1, freeze_rows = 1, items_count = #template_items_names * 2,
              outer_size_value = ImVec2(0.0, TEXT_BASE_HEIGHT * 12), row_min_height = 0.0, inner_width_with_scroll = 0.0,
              outer_size_enabled = true, show_headers = true, show_wrapped_text = false,
              items = {}, selection = {}, items_need_sort = false, show_debug_details = false }
        ST.advanced = s
    end
    if ImGui.TreeNode("Options") then
        Tables_AdvancedOptions(s)
        ImGui.TreePop()
    end

    -- Update item list if we changed the number of items
    local items = s.items
    local selection = s.selection
    if #items ~= s.items_count then
        for n = #items, s.items_count + 1, -1 do items[n] = nil end
        for n = 0, s.items_count - 1 do
            local template_n = n % #template_items_names
            items[n + 1] = MyItem(n, template_items_names[template_n + 1], (template_n == 3) and 10 or (template_n == 4) and 20 or 0) -- Assign default quantities
        end
    end

    local parent_draw_list = ImGui.GetWindowDrawList()
    local parent_draw_list_draw_cmd_count = parent_draw_list.CmdBuffer.Size
    local table_scroll_cur, table_scroll_max -- For debug display
    local table_draw_list = nil

    -- Submit table
    local flags = s.flags
    local columns_base_flags = s.columns_base_flags
    local inner_width_to_use = Has(flags, TF.ScrollX) and s.inner_width_with_scroll or 0.0
    local CF = ImGuiTableColumnFlags
    if ImGui.BeginTable("table_advanced", 6, flags, s.outer_size_enabled and s.outer_size_value or ImVec2(0, 0), inner_width_to_use) then
        ImGui.TableSetupColumn("ID",          bor(columns_base_flags, CF.DefaultSort, CF.WidthFixed, CF.NoHide), 0.0, MyItemColumnID_ID)
        ImGui.TableSetupColumn("Name",        bor(columns_base_flags, CF.WidthFixed), 0.0, MyItemColumnID_Name)
        ImGui.TableSetupColumn("Action",      bor(columns_base_flags, CF.NoSort, CF.WidthFixed), 0.0, MyItemColumnID_Action)
        ImGui.TableSetupColumn("Quantity",    bor(columns_base_flags, CF.PreferSortDescending), 0.0, MyItemColumnID_Quantity)
        ImGui.TableSetupColumn("Description", bor(columns_base_flags, Has(flags, TF.NoHostExtendX) and 0 or CF.WidthStretch), 0.0, MyItemColumnID_Description)
        ImGui.TableSetupColumn("Hidden",      bor(columns_base_flags, CF.DefaultHide, CF.NoSort))
        ImGui.TableSetupScrollFreeze(s.freeze_cols, s.freeze_rows)

        -- Sort our data if sort specs have been changed!
        local sort_specs = ImGui.TableGetSortSpecs()
        if sort_specs and sort_specs.SpecsDirty then
            s.items_need_sort = true
        end
        if sort_specs and s.items_need_sort and #items > 1 then
            MyItem_SortWithSortSpecs(sort_specs, items, #items)
            sort_specs.SpecsDirty = false
        end
        s.items_need_sort = false

        local sorts_specs_using_quantity = Has(ImGui.TableGetColumnFlags(3), CF.IsSorted)

        -- Show headers
        if s.show_headers and Has(columns_base_flags, CF.AngledHeader) then
            ImGui.TableAngledHeadersRow()
        end
        if s.show_headers then
            ImGui.TableHeadersRow()
        end

        -- Demonstrate using clipper for large vertical lists
        local clipper = ImGuiListClipper()
        clipper:Begin(#items)
        while clipper:Step() do
            for row_n = clipper.DisplayStart, clipper.DisplayEnd - 1 do
                local item = items[row_n + 1]

                local item_is_selected = table.find(selection, item.ID) ~= nil
                ImGui.PushID(item.ID)
                ImGui.TableNextRow(ImGuiTableRowFlags.None, s.row_min_height)

                -- For the demo purpose we can select among different type of items submitted in the first column
                ImGui.TableSetColumnIndex(0)
                local label = string.format("%04d", item.ID)
                local ct = s.contents_type
                if ct == CT_Text then
                    ImGui.TextUnformatted(label)
                elseif ct == CT_Button then
                    ImGui.Button(label)
                elseif ct == CT_SmallButton then
                    ImGui.SmallButton(label)
                elseif ct == CT_FillButton then
                    ImGui.Button(label, ImVec2(-FLT_MIN, 0.0))
                elseif ct == CT_Selectable or ct == CT_SelectableSpanRow then
                    local selectable_flags = (ct == CT_SelectableSpanRow) and bor(ImGuiSelectableFlags.SpanAllColumns, ImGuiSelectableFlags.AllowOverlap) or ImGuiSelectableFlags.None
                    if ImGui.Selectable(label, item_is_selected, selectable_flags, ImVec2(0, s.row_min_height)) then
                        if ImGui.GetIO().KeyCtrl then
                            if item_is_selected then
                                table.remove(selection, table.find(selection, item.ID))
                            else
                                table.insert(selection, item.ID)
                            end
                        else
                            table.clear(selection)
                            table.insert(selection, item.ID)
                        end
                    end
                end

                if ImGui.TableSetColumnIndex(1) then
                    ImGui.TextUnformatted(item.Name)
                end

                if ImGui.TableSetColumnIndex(2) then
                    if ImGui.SmallButton("Chop") then item.Quantity = item.Quantity + 1 end
                    if sorts_specs_using_quantity and ImGui.IsItemDeactivated() then s.items_need_sort = true end
                    ImGui.SameLine()
                    if ImGui.SmallButton("Eat") then item.Quantity = item.Quantity - 1 end
                    if sorts_specs_using_quantity and ImGui.IsItemDeactivated() then s.items_need_sort = true end
                end

                if ImGui.TableSetColumnIndex(3) then
                    ImGui.Text("%d", item.Quantity)
                end

                ImGui.TableSetColumnIndex(4)
                if s.show_wrapped_text then
                    ImGui.TextWrapped("Lorem ipsum dolor sit amet")
                else
                    ImGui.Text("Lorem ipsum dolor sit amet")
                end

                if ImGui.TableSetColumnIndex(5) then
                    ImGui.Text("1234")
                end

                ImGui.PopID()
            end
        end

        -- Store some info to display debug details below
        table_scroll_cur = ImVec2(ImGui.GetScrollX(), ImGui.GetScrollY())
        table_scroll_max = ImVec2(ImGui.GetScrollMaxX(), ImGui.GetScrollMaxY())
        table_draw_list = ImGui.GetWindowDrawList()
        ImGui.EndTable()
    end
    _, s.show_debug_details = ImGui.Checkbox("Debug details", s.show_debug_details)
    if s.show_debug_details and table_draw_list then
        ImGui.SameLine(0.0, 0.0)
        local table_draw_list_draw_cmd_count = table_draw_list.CmdBuffer.Size
        if table_draw_list == parent_draw_list then
            ImGui.Text(": DrawCmd: +%d (in same window)",
                table_draw_list_draw_cmd_count - parent_draw_list_draw_cmd_count)
        else
            ImGui.Text(": DrawCmd: +%d (in child window), Scroll: (%.f/%.f) (%.f/%.f)",
                table_draw_list_draw_cmd_count - 1, table_scroll_cur.x, table_scroll_max.x, table_scroll_cur.y, table_scroll_max.y)
        end
    end
end

local DCS = { selected = -1, h_borders = true, v_borders = true, columns_count = 4, foo = 1.0, bar = 1.0 }

local function DemoWindowColumns()
    local open = ImGui.TreeNode("Legacy Columns API")
    ImGui.SameLine()
    DemoHelpMarker("Columns() is an old API! Prefer using the more flexible and powerful BeginTable() API!")
    if not open then
        return
    end

    -- Basic columns
    if ImGui.TreeNode("Basic") then
        IMGUI_DEMO_MARKER("Columns (legacy API)/Basic")
        ImGui.Text("Without border:")
        ImGui.Columns(3, "mycolumns3", false) -- 3-ways, no border
        ImGui.Separator()
        for n = 0, 13 do
            local label = string.format("Item %d", n)
            if ImGui.Selectable(label) then end
            ImGui.NextColumn()
        end
        ImGui.Columns(1)
        ImGui.Separator()

        ImGui.Text("With border:")
        ImGui.Columns(4, "mycolumns") -- 4-ways, with border
        ImGui.Separator()
        ImGui.Text("ID"); ImGui.NextColumn()
        ImGui.Text("Name"); ImGui.NextColumn()
        ImGui.Text("Path"); ImGui.NextColumn()
        ImGui.Text("Hovered"); ImGui.NextColumn()
        ImGui.Separator()
        local names = { "One", "Two", "Three" }
        local paths = { "/path/one", "/path/two", "/path/three" }
        for i = 0, 2 do
            local label = string.format("%04d", i)
            if ImGui.Selectable(label, DCS.selected == i, ImGuiSelectableFlags.SpanAllColumns) then
                DCS.selected = i
            end
            local hovered = ImGui.IsItemHovered()
            ImGui.NextColumn()
            ImGui.Text(names[i + 1]); ImGui.NextColumn()
            ImGui.Text(paths[i + 1]); ImGui.NextColumn()
            ImGui.Text("%d", hovered and 1 or 0); ImGui.NextColumn()
        end
        ImGui.Columns(1)
        ImGui.Separator()
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Borders") then
        IMGUI_DEMO_MARKER("Columns (legacy API)/Borders")
        -- NB: Future columns API should allow automatic horizontal borders.
        local lines_count = 3
        ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
        DCS.columns_count = ImGui.DragInt("##columns_count", DCS.columns_count, 0.1, 2, 10, "%d columns")
        if DCS.columns_count < 2 then
            DCS.columns_count = 2
        end
        ImGui.SameLine()
        _, DCS.h_borders = ImGui.Checkbox("horizontal", DCS.h_borders)
        ImGui.SameLine()
        _, DCS.v_borders = ImGui.Checkbox("vertical", DCS.v_borders)
        ImGui.Columns(DCS.columns_count, nil, DCS.v_borders)
        for i = 0, DCS.columns_count * lines_count - 1 do
            if DCS.h_borders and ImGui.GetColumnIndex() == 0 then
                ImGui.Separator()
            end
            ImGui.PushID(i)
            local c = string.char(string.byte("a") + i)
            ImGui.Text("%s%s%s", c, c, c)
            ImGui.Text("Width %.2f", ImGui.GetColumnWidth())
            ImGui.Text("Avail %.2f", ImGui.GetContentRegionAvail().x)
            ImGui.Text("Offset %.2f", ImGui.GetColumnOffset())
            ImGui.Text("Long text that is likely to clip")
            ImGui.Button("Button", ImVec2(-FLT_MIN, 0.0))
            ImGui.PopID()
            ImGui.NextColumn()
        end
        ImGui.Columns(1)
        if DCS.h_borders then
            ImGui.Separator()
        end
        ImGui.TreePop()
    end

    -- Create multiple items in a same cell before switching to next column
    if ImGui.TreeNode("Mixed items") then
        IMGUI_DEMO_MARKER("Columns (legacy API)/Mixed items")
        ImGui.Columns(3, "mixed")
        ImGui.Separator()

        ImGui.Text("Hello")
        ImGui.Button("Banana")
        ImGui.NextColumn()

        ImGui.Text("ImGui")
        ImGui.Button("Apple")
        DCS.foo = ImGui.InputFloat("red", DCS.foo, 0.05, 0, "%.3f")
        ImGui.Text("An extra line here.")
        ImGui.NextColumn()

        ImGui.Text("Sailor")
        ImGui.Button("Corniflower")
        DCS.bar = ImGui.InputFloat("blue", DCS.bar, 0.05, 0, "%.3f")
        ImGui.NextColumn()

        if ImGui.CollapsingHeader("Category A") then ImGui.Text("Blah blah blah") end ImGui.NextColumn()
        if ImGui.CollapsingHeader("Category B") then ImGui.Text("Blah blah blah") end ImGui.NextColumn()
        if ImGui.CollapsingHeader("Category C") then ImGui.Text("Blah blah blah") end ImGui.NextColumn()
        ImGui.Columns(1)
        ImGui.Separator()
        ImGui.TreePop()
    end

    -- Word wrapping
    if ImGui.TreeNode("Word-wrapping") then
        IMGUI_DEMO_MARKER("Columns (legacy API)/Word-wrapping")
        ImGui.Columns(2, "word-wrapping")
        ImGui.Separator()
        ImGui.TextWrapped("The quick brown fox jumps over the lazy dog.")
        ImGui.TextWrapped("Hello Left")
        ImGui.NextColumn()
        ImGui.TextWrapped("The quick brown fox jumps over the lazy dog.")
        ImGui.TextWrapped("Hello Right")
        ImGui.Columns(1)
        ImGui.Separator()
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Horizontal Scrolling") then
        IMGUI_DEMO_MARKER("Columns (legacy API)/Horizontal Scrolling")
        ImGui.SetNextWindowContentSize(ImVec2(1500.0, 0.0))
        local child_size = ImVec2(0, ImGui.GetFontSize() * 20.0)
        ImGui.BeginChild("##ScrollingRegion", child_size, ImGuiChildFlags.None, ImGuiWindowFlags.HorizontalScrollbar)
        ImGui.Columns(10)

        -- Also demonstrate using clipper for large vertical lists
        local ITEMS_COUNT = 2000
        local clipper = ImGuiListClipper()
        clipper:Begin(ITEMS_COUNT)
        while clipper:Step() do
            for i = clipper.DisplayStart, clipper.DisplayEnd - 1 do
                for j = 0, 9 do
                    ImGui.Text("Line %d Column %d...", i, j)
                    ImGui.NextColumn()
                end
            end
        end
        ImGui.Columns(1)
        ImGui.EndChild()
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Tree") then
        IMGUI_DEMO_MARKER("Columns (legacy API)/Tree")
        ImGui.Columns(2, "tree", true)
        for x = 0, 2 do
            local open1 = ImGui.TreeNode(x, "Node%d", x)
            ImGui.NextColumn()
            ImGui.Text("Node contents")
            ImGui.NextColumn()
            if open1 then
                for y = 0, 2 do
                    local open2 = ImGui.TreeNode(y, "Node%d.%d", x, y)
                    ImGui.NextColumn()
                    ImGui.Text("Node contents")
                    if open2 then
                        ImGui.Text("Even more contents")
                        if ImGui.TreeNode("Tree in column") then
                            ImGui.Text("The quick brown fox jumps over the lazy dog")
                            ImGui.TreePop()
                        end
                    end
                    ImGui.NextColumn()
                    if open2 then
                        ImGui.TreePop()
                    end
                end
                ImGui.TreePop()
            end
        end
        ImGui.Columns(1)
        ImGui.TreePop()
    end

    ImGui.TreePop()
end

local tables_sections = {
    { "Basic", Tables_Basic },
    { "Borders, background", Tables_BordersBackground },
    { "Resizable, stretch", Tables_ResizableStretch },
    { "Resizable, fixed", Tables_ResizableFixed },
    { "Resizable, mixed", Tables_ResizableMixed },
    { "Reorderable, hideable, with headers", Tables_Reorderable },
    { "Padding", Tables_Padding },
    { "Sizing policies", Tables_SizingPolicies },
    { "Vertical scrolling, with clipping", Tables_VerticalScrolling },
    { "Horizontal scrolling", Tables_HorizontalScrolling },
    { "Columns flags", Tables_ColumnsFlags },
    { "Columns widths", Tables_ColumnsWidths },
    { "Nested tables", Tables_Nested },
    { "Row height", Tables_RowHeight },
    { "Outer size", Tables_OuterSize },
    { "Background color", Tables_BackgroundColor },
    { "Tree view", Tables_TreeView },
    { "Item width", Tables_ItemWidth },
    { "Custom headers", Tables_CustomHeaders },
    { "Angled headers", Tables_AngledHeaders },
    { "Context menus", Tables_ContextMenus },
    { "Synced instances", Tables_SyncedInstances },
    { "Sorting", Tables_Sorting },
    { "Advanced", Tables_Advanced },
}

function DemoWindowTables()
    if not ImGui.CollapsingHeader("Tables & Columns") then
        return
    end

    -- Using those as a base value to create width/height that are factor of the size of our font
    TEXT_BASE_WIDTH = ImGui.CalcTextSize("A").x
    TEXT_BASE_HEIGHT = ImGui.GetTextLineHeightWithSpacing()

    ImGui.PushID("Tables")

    local open_action = -1
    if ImGui.Button("Expand all") then
        open_action = 1
    end
    ImGui.SameLine()
    if ImGui.Button("Collapse all") then
        open_action = 0
    end
    ImGui.SameLine()

    -- Options
    _, ST.disable_indent = ImGui.Checkbox("Disable tree indentation", ST.disable_indent or false)
    ImGui.SameLine()
    DemoHelpMarker("Disable the indenting of tree nodes so demo tables can use the full window width.")
    ImGui.Separator()
    local disable_indent = ST.disable_indent
    if disable_indent then
        ImGui.PushStyleVar(ImGuiStyleVar.IndentSpacing, 0.0)
    end

    -- Demos
    for _, sec in ipairs(tables_sections) do
        if open_action ~= -1 then
            ImGui.SetNextItemOpen(open_action ~= 0)
        end
        if ImGui.TreeNode(sec[1]) then
            sec[2]()
            ImGui.TreePop()
        end
    end

    ImGui.PopID()

    DemoWindowColumns()

    if disable_indent then
        ImGui.PopStyleVar()
    end
end
end

__FILES['imgui_demo_apps.lua'] = function()
-- Demo: Example apps (port of imgui_demo.cpp "Example App" sections). Each ShowExampleAppXXX(p_open) returns the new p_open.
local _
local Buf, BufStr = DemoBuf, DemoBufStr

local function BufSet(buf, str)
    for i = 1, #str do buf[i] = string.byte(str, i) end
    buf[#str + 1] = 0
end

----------------------------------------------------------------
-- [SECTION] Example App: Debug Console / ShowExampleAppConsole()
----------------------------------------------------------------

local Console = nil
local function ConsoleNew()
    local c = { InputBuf = Buf("", 256), Items = {}, Commands = { "HELP", "HISTORY", "CLEAR", "CLASSIFY" }, History = {},
        HistoryPos = -1, Filter = ImGuiTextFilter(), AutoScroll = true, ScrollToBottom = false }
    function c:ClearLog() self.Items = {} end
    function c:AddLog(fmt, ...)
        local s = (select("#", ...) > 0) and string.format(fmt, ...) or fmt
        self.Items[#self.Items + 1] = s
    end
    function c:ExecCommand(command_line)
        self:AddLog("# %s\n", command_line)
        self.HistoryPos = -1
        for i = #self.History, 1, -1 do
            if string.upper(self.History[i]) == string.upper(command_line) then table.remove(self.History, i); break end
        end
        self.History[#self.History + 1] = command_line
        local cmd = string.upper(command_line)
        if cmd == "CLEAR" then
            self:ClearLog()
        elseif cmd == "HELP" then
            self:AddLog("Commands:")
            for i = 1, #self.Commands do self:AddLog("- %s", self.Commands[i]) end
        elseif cmd == "HISTORY" then
            local first = #self.History - 10
            for i = math.max(first, 0), #self.History - 1 do self:AddLog("%3d: %s\n", i, self.History[i + 1]) end
        else
            self:AddLog("Unknown command: '%s'\n", command_line)
        end
        self.ScrollToBottom = true
    end
    function c:TextEditCallback(data)
        if data.EventFlag == ImGuiInputTextFlags.CallbackCompletion then
            -- Locate beginning of current word (positions are 0-based offsets into data.Buf)
            local word_end = data.CursorPos
            local word_start = word_end
            while word_start > 0 do
                local ch = data.Buf[word_start]
                if ch == 32 or ch == 9 or ch == 44 or ch == 59 then break end
                word_start = word_start - 1
            end
            local word = ""
            for i = word_start + 1, word_end do word = word .. string.char(data.Buf[i]) end
            local candidates = {}
            for i = 1, #self.Commands do
                if string.upper(string.sub(self.Commands[i], 1, #word)) == string.upper(word) then candidates[#candidates + 1] = self.Commands[i] end
            end
            if #candidates == 0 then
                self:AddLog("No match for \"%s\"!\n", word)
            elseif #candidates == 1 then
                data:DeleteChars(word_start, word_end - word_start)
                data:InsertChars(data.CursorPos, candidates[1])
                data:InsertChars(data.CursorPos, " ")
            else
                local match_len = word_end - word_start
                while true do
                    local ch, all_match = nil, true
                    for i = 1, #candidates do
                        local cc = string.upper(string.sub(candidates[i], match_len + 1, match_len + 1))
                        if i == 1 then ch = cc elseif ch == "" or ch ~= cc then all_match = false; break end
                    end
                    if not all_match or ch == "" then break end
                    match_len = match_len + 1
                end
                if match_len > 0 then
                    data:DeleteChars(word_start, word_end - word_start)
                    data:InsertChars(data.CursorPos, string.sub(candidates[1], 1, match_len))
                end
                self:AddLog("Possible matches:\n")
                for i = 1, #candidates do self:AddLog("- %s\n", candidates[i]) end
            end
        elseif data.EventFlag == ImGuiInputTextFlags.CallbackHistory then
            local prev_history_pos = self.HistoryPos
            if data.EventKey == ImGuiKey.UpArrow then
                if self.HistoryPos == -1 then self.HistoryPos = #self.History - 1
                elseif self.HistoryPos > 0 then self.HistoryPos = self.HistoryPos - 1 end
            elseif data.EventKey == ImGuiKey.DownArrow then
                if self.HistoryPos ~= -1 then
                    self.HistoryPos = self.HistoryPos + 1
                    if self.HistoryPos >= #self.History then self.HistoryPos = -1 end
                end
            end
            if prev_history_pos ~= self.HistoryPos then
                local history_str = (self.HistoryPos >= 0) and self.History[self.HistoryPos + 1] or ""
                data:DeleteChars(0, data.BufTextLen)
                data:InsertChars(0, history_str)
            end
        end
        return 0
    end
    function c:Draw(title, p_open)
        ImGui.SetNextWindowSize(ImVec2(520, 600), ImGuiCond.FirstUseEver)
        local visible
        p_open, visible = ImGui.Begin(title, p_open)
        if not visible then ImGui.End(); return p_open end

        if ImGui.BeginPopupContextItem() then
            if ImGui.MenuItem("Close Console") then p_open = false end
            ImGui.EndPopup()
        end
        ImGui.TextWrapped("This example implements a console with basic coloring, completion (TAB key) and history (Up/Down keys). A more elaborate implementation may want to store entries along with extra data such as timestamp, emitter, etc.")
        ImGui.TextWrapped("Enter 'HELP' for help.")
        if ImGui.SmallButton("Add Debug Text") then self:AddLog("%d some text", #self.Items); self:AddLog("some more text"); self:AddLog("display very important message here!") end
        ImGui.SameLine()
        if ImGui.SmallButton("Add Debug Error") then self:AddLog("[error] something went wrong") end
        ImGui.SameLine()
        if ImGui.SmallButton("Clear") then self:ClearLog() end
        ImGui.SameLine()
        local copy_to_clipboard = ImGui.SmallButton("Copy")
        ImGui.Separator()

        if ImGui.BeginPopup("Options") then
            _, self.AutoScroll = ImGui.Checkbox("Auto-scroll", self.AutoScroll)
            ImGui.EndPopup()
        end
        ImGui.SetNextItemShortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.O), ImGuiInputFlags.Tooltip)
        if ImGui.Button("Options") then ImGui.OpenPopup("Options") end
        ImGui.SameLine()
        ImGui.SetNextItemShortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.F), ImGuiInputFlags.Tooltip)
        ImGui.SetNextItemWidth(-FLT_MIN)
        self.Filter:DrawWithHint("##Filter", "Filter (incl -excl)")
        ImGui.Separator()

        local style = ImGui.GetStyle()
        local footer_height_to_reserve = (style.SeparatorSize or 1.0) + style.ItemSpacing.y + ImGui.GetFrameHeightWithSpacing()
        if ImGui.BeginChild("ScrollingRegion", ImVec2(0, -footer_height_to_reserve), ImGuiChildFlags.NavFlattened, ImGuiWindowFlags.HorizontalScrollbar) then
            if ImGui.BeginPopupContextWindow() then
                if ImGui.Selectable("Clear") then self:ClearLog() end
                ImGui.EndPopup()
            end
            ImGui.PushStyleVar(ImGuiStyleVar.ItemSpacing, ImVec2(4, 1))
            if copy_to_clipboard then ImGui.LogToClipboard() end
            for _, item in ipairs(self.Items) do
                if self.Filter:PassFilter(item) then
                    local color
                    if string.find(item, "[error]", 1, true) then color = ImVec4(1.0, 0.4, 0.4, 1.0)
                    elseif string.sub(item, 1, 2) == "# " then color = ImVec4(1.0, 0.8, 0.6, 1.0) end
                    if color then ImGui.PushStyleColor(ImGuiCol.Text, color) end
                    ImGui.TextUnformatted(item)
                    if color then ImGui.PopStyleColor() end
                end
            end
            if copy_to_clipboard then ImGui.LogFinish() end
            if self.ScrollToBottom or (self.AutoScroll and ImGui.GetScrollY() >= ImGui.GetScrollMaxY()) then ImGui.SetScrollHereY(1.0) end
            self.ScrollToBottom = false
            ImGui.PopStyleVar()
        end
        ImGui.EndChild()
        ImGui.Separator()

        local reclaim_focus = false
        local IT = ImGuiInputTextFlags
        local input_text_flags = bit32.bor(IT.EnterReturnsTrue, IT.EscapeClearsAll, IT.CallbackCompletion, IT.CallbackHistory)
        if ImGui.InputText("Input", self.InputBuf, 256, input_text_flags, function(data) return self:TextEditCallback(data) end) then
            local s = string.gsub(BufStr(self.InputBuf), " +$", "")
            if s ~= "" then self:ExecCommand(s) end
            self.InputBuf[1] = 0
            reclaim_focus = true
        end
        ImGui.SetItemDefaultFocus()
        if reclaim_focus then ImGui.SetKeyboardFocusHere(-1) end
        ImGui.End()
        return p_open
    end
    c:AddLog("Welcome to Dear ImGui!")
    return c
end

function ShowExampleAppConsole(p_open)
    Console = Console or ConsoleNew()
    return Console:Draw("Example: Console", p_open)
end

----------------------------------------------------------------
-- [SECTION] Example App: Debug Log / ShowExampleAppLog()
----------------------------------------------------------------

-- Lines are stored as a Lua array (equivalent of Buf + LineOffsets)
local function ExampleAppLog()
    local l = { Lines = { "" }, Filter = ImGuiTextFilter(), AutoScroll = true }
    function l:Clear() self.Lines = { "" } end
    function l:AddLog(fmt, ...)
        local s = (select("#", ...) > 0) and string.format(fmt, ...) or fmt
        local lines = self.Lines
        for part, nl in string.gmatch(s, "([^\n]*)(\n?)") do
            lines[#lines] = lines[#lines] .. part
            if nl ~= "" then lines[#lines + 1] = "" end
            if part == "" and nl == "" then break end
        end
    end
    function l:Draw(title, p_open)
        local visible
        p_open, visible = ImGui.Begin(title, p_open)
        if not visible then ImGui.End(); return p_open end
        if ImGui.BeginPopup("Options") then
            _, self.AutoScroll = ImGui.Checkbox("Auto-scroll", self.AutoScroll)
            ImGui.EndPopup()
        end
        if ImGui.Button("Options") then ImGui.OpenPopup("Options") end
        ImGui.SameLine()
        local clear = ImGui.Button("Clear")
        ImGui.SameLine()
        local copy = ImGui.Button("Copy")
        ImGui.SameLine()
        ImGui.SetNextItemWidth(-FLT_MIN)
        self.Filter:DrawWithHint("##Filter", "Filter (incl -excl)")
        ImGui.Separator()
        if ImGui.BeginChild("scrolling", ImVec2(0, 0), ImGuiChildFlags.None, ImGuiWindowFlags.HorizontalScrollbar) then
            if clear then self:Clear() end
            if copy then ImGui.LogToClipboard() end
            ImGui.PushStyleVar(ImGuiStyleVar.ItemSpacing, ImVec2(0, 0))
            local lines = self.Lines
            if self.Filter:IsActive() then
                for line_no = 1, #lines do
                    if self.Filter:PassFilter(lines[line_no]) then ImGui.TextUnformatted(lines[line_no]) end
                end
            else
                local clipper = ImGuiListClipper()
                clipper:Begin(#lines)
                while clipper:Step() do
                    for line_no = clipper.DisplayStart, clipper.DisplayEnd - 1 do ImGui.TextUnformatted(lines[line_no + 1]) end
                end
                clipper:End()
            end
            ImGui.PopStyleVar()
            if copy then ImGui.LogFinish() end
            if self.AutoScroll and ImGui.GetScrollY() >= ImGui.GetScrollMaxY() then ImGui.SetScrollHereY(1.0) end
        end
        ImGui.EndChild()
        ImGui.End()
        return p_open
    end
    return l
end

local AppLog, AppLogCounter = nil, 0
function ShowExampleAppLog(p_open)
    AppLog = AppLog or ExampleAppLog()
    ImGui.SetNextWindowSize(ImVec2(500, 400), ImGuiCond.FirstUseEver)
    p_open = ImGui.Begin("Example: Log", p_open)
    if ImGui.SmallButton("[Debug] Add 5 entries") then
        local categories = { "info", "warn", "error" }
        local words = { "Bumfuzzled", "Cattywampus", "Snickersnee", "Abibliophobia", "Absquatulate", "Nincompoop", "Pauciloquent" }
        for _ = 1, 5 do
            local category = categories[AppLogCounter % #categories + 1]
            local word = words[AppLogCounter % #words + 1]
            AppLog:AddLog("[%05d] [%s] Hello, current time is %.1f, here's a word: '%s'\n", ImGui.GetFrameCount(), category, ImGui.GetTime(), word)
            AppLogCounter = AppLogCounter + 1
        end
    end
    ImGui.End()
    return AppLog:Draw("Example: Log", p_open)
end

----------------------------------------------------------------
-- [SECTION] Example App: Simple Layout / ShowExampleAppLayout()
----------------------------------------------------------------

local LayoutSelected = 0
function ShowExampleAppLayout(p_open)
    ImGui.SetNextWindowSize(ImVec2(500, 440), ImGuiCond.FirstUseEver)
    local visible
    p_open, visible = ImGui.Begin("Example: Simple layout", p_open, ImGuiWindowFlags.MenuBar)
    if visible then
        if ImGui.BeginMenuBar() then
            if ImGui.BeginMenu("File") then
                if ImGui.MenuItem("Close", "Ctrl+W") then p_open = false end
                ImGui.EndMenu()
            end
            ImGui.EndMenuBar()
        end
        ImGui.BeginChild("left pane", ImVec2(150, 0), bit32.bor(ImGuiChildFlags.Borders, ImGuiChildFlags.ResizeX))
        for i = 0, 99 do
            if ImGui.Selectable(string.format("MyObject %d", i), LayoutSelected == i, ImGuiSelectableFlags.SelectOnNav) then LayoutSelected = i end
        end
        ImGui.EndChild()
        ImGui.SameLine()
        ImGui.BeginGroup()
        ImGui.BeginChild("item view", ImVec2(0, -ImGui.GetFrameHeightWithSpacing()))
        ImGui.Text("MyObject: %d", LayoutSelected)
        ImGui.Separator()
        if ImGui.BeginTabBar("##Tabs", ImGuiTabBarFlags.None) then
            if ImGui.BeginTabItem("Description") then
                ImGui.TextWrapped("Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. ")
                ImGui.EndTabItem()
            end
            if ImGui.BeginTabItem("Details") then
                ImGui.Text("ID: 0123456789")
                ImGui.EndTabItem()
            end
            ImGui.EndTabBar()
        end
        ImGui.EndChild()
        if ImGui.Button("Revert") then end
        ImGui.SameLine()
        if ImGui.Button("Save") then end
        ImGui.EndGroup()
    end
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] Example App: Property Editor / ShowExampleAppPropertyEditor()
----------------------------------------------------------------

-- ExampleMemberInfo equivalent: field name, data type, component count
local ExampleTreeNodeMemberInfos = {
    { Name = "MyName", DataType = ImGuiDataType.String, DataCount = 1, Field = "Name" },
    { Name = "MyBool", DataType = ImGuiDataType.Bool,   DataCount = 1, Field = "DataMyBool" },
    { Name = "MyInt",  DataType = ImGuiDataType.S32,    DataCount = 1, Field = "DataMyInt" },
    { Name = "MyVec2", DataType = ImGuiDataType.Float,  DataCount = 2, Field = "DataMyVec2" },
}

local PropEd = { Filter = nil, SelectedNode = nil, UseClipper = false, NameBufs = setmetatable({}, { __mode = "k" }) }

function PropEd:IsNodePassingFilter(node)
    return node.Parent.Parent ~= nil or self.Filter:PassFilter(node.Name)
end

function PropEd:DrawTreeNode(node)
    local TN = ImGuiTreeNodeFlags
    ImGui.TableNextRow()
    ImGui.TableNextColumn()
    local tree_flags = bit32.bor(TN.OpenOnArrow, TN.OpenOnDoubleClick, TN.NavLeftJumpsToParent, TN.SpanFullWidth, TN.DrawLinesToNodes)
    if node == self.SelectedNode then tree_flags = bit32.bor(tree_flags, TN.Selected) end
    if #node.Childs == 0 then tree_flags = bit32.bor(tree_flags, TN.Leaf, TN.Bullet, TN.NoTreePushOnOpen) end
    if node.DataMyBool == false then ImGui.PushStyleColor(ImGuiCol.Text, ImGui.GetStyle().Colors[ImGuiCol.TextDisabled]) end
    ImGui.SetNextItemStorageID(node.UID)
    local is_open = ImGui.TreeNodeEx(node.UID, tree_flags, "%s", node.Name)
    if #node.Childs == 0 then is_open = false end
    if node.DataMyBool == false then ImGui.PopStyleColor() end
    if ImGui.IsItemFocused() then self.SelectedNode = node end
    return is_open
end

function PropEd:DrawTree(node)
    for _, child in ipairs(node.Childs) do
        if self:IsNodePassingFilter(child) and self:DrawTreeNode(child) then
            self:DrawTree(child)
            ImGui.TreePop()
        end
    end
end

function PropEd:DrawClippedTreeNodeAndAdvanceToNext(clipper, node)
    if self:IsNodePassingFilter(node) then
        local is_open
        if clipper.UserIndex >= clipper.DisplayStart and clipper.UserIndex < clipper.DisplayEnd then
            is_open = self:DrawTreeNode(node)
        else
            is_open = (#node.Childs > 0 and ImGui.TreeNodeGetOpen(node.UID))
            if is_open then ImGui.TreePush(node.Name) end
        end
        clipper.UserIndex = clipper.UserIndex + 1
        if is_open then return node.Childs[1] end
    end
    while node ~= nil do
        if node.IndexInParent + 1 < #node.Parent.Childs then
            return node.Parent.Childs[node.IndexInParent + 2]
        end
        node = node.Parent
        if node.Parent == nil then break end
        ImGui.TreePop()
    end
    return nil
end

function PropEd:DrawClippedTree(root_node)
    local node = root_node.Childs[1]
    local clipper = ImGuiListClipper()
    clipper:Begin(INT_MAX)
    while clipper:Step() do
        while clipper.UserIndex < clipper.DisplayEnd and node ~= nil do
            node = self:DrawClippedTreeNodeAndAdvanceToNext(clipper, node)
        end
    end
    while node ~= nil do
        node = self:DrawClippedTreeNodeAndAdvanceToNext(clipper, node)
    end
    clipper:SeekCursorForItem(clipper.UserIndex)
end

function PropEd:Draw(root_node)
    self.Filter = self.Filter or ImGuiTextFilter()
    if ImGui.BeginChild("##tree", ImVec2(300, 0), bit32.bor(ImGuiChildFlags.ResizeX, ImGuiChildFlags.Borders, ImGuiChildFlags.NavFlattened)) then
        ImGui.PushItemFlag(ImGuiItemFlags.NoNavDefaultFocus, true)
        _, self.UseClipper = ImGui.Checkbox("Use Clipper", self.UseClipper)
        ImGui.SameLine()
        ImGui.Text("(%d root nodes)", #root_node.Childs)
        ImGui.SetNextItemWidth(-FLT_MIN)
        ImGui.SetNextItemShortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.F), ImGuiInputFlags.Tooltip)
        if ImGui.InputTextWithHint("##Filter", "incl -excl", self.Filter.InputBuf, 256, ImGuiInputTextFlags.EscapeClearsAll) then
            self.Filter:Build()
        end
        ImGui.PopItemFlag()
        if ImGui.BeginTable("##list", 1, ImGuiTableFlags.RowBg) then
            if self.UseClipper then self:DrawClippedTree(root_node) else self:DrawTree(root_node) end
            ImGui.EndTable()
        end
    end
    ImGui.EndChild()

    ImGui.SameLine()
    ImGui.BeginGroup()
    local node = self.SelectedNode
    if node then
        ImGui.Text("%s", node.Name)
        ImGui.TextDisabled("UID: 0x%08X", node.UID)
        ImGui.Separator()
        if ImGui.BeginTable("##properties", 2, bit32.bor(ImGuiTableFlags.Resizable, ImGuiTableFlags.ScrollY)) then
            ImGui.PushID(node.UID)
            ImGui.TableSetupColumn("", ImGuiTableColumnFlags.WidthFixed)
            ImGui.TableSetupColumn("", ImGuiTableColumnFlags.WidthStretch, 2.0)
            if node.HasData then
                for _, field_desc in ipairs(ExampleTreeNodeMemberInfos) do
                    ImGui.TableNextRow()
                    ImGui.PushID(field_desc.Name)
                    ImGui.TableNextColumn()
                    ImGui.AlignTextToFramePadding()
                    ImGui.TextUnformatted(field_desc.Name)
                    ImGui.TableNextColumn()
                    local DT = ImGuiDataType
                    if field_desc.DataType == DT.Bool then
                        _, node[field_desc.Field] = ImGui.Checkbox("##Editor", node[field_desc.Field])
                    elseif field_desc.DataType == DT.S32 then
                        ImGui.SetNextItemWidth(-FLT_MIN)
                        node[field_desc.Field] = ImGui.DragScalar("##Editor", DT.S32, node[field_desc.Field], 1.0, INT_MIN or -2147483648, INT_MAX)
                    elseif field_desc.DataType == DT.Float then
                        ImGui.SetNextItemWidth(-FLT_MIN)
                        ImGui.SliderScalarN("##Editor", DT.Float, node[field_desc.Field], field_desc.DataCount, 0.0, 1.0)
                    elseif field_desc.DataType == DT.String then
                        local b = self.NameBufs[node]
                        if b == nil then b = Buf(node.Name, 28); self.NameBufs[node] = b end
                        if ImGui.InputText("##Editor", b, 28) then node.Name = BufStr(b) end
                    end
                    ImGui.PopID()
                end
            end
            ImGui.PopID()
            ImGui.EndTable()
        end
    end
    ImGui.EndGroup()
end

local DemoTree = nil
function ShowExampleAppPropertyEditor(p_open, demo_data)
    ImGui.SetNextWindowSize(ImVec2(430, 450), ImGuiCond.FirstUseEver)
    local visible
    p_open, visible = ImGui.Begin("Example: Property editor", p_open)
    if not visible then ImGui.End(); return p_open end
    if demo_data and demo_data.DemoTree == nil then demo_data.DemoTree = ExampleTree_CreateDemoTree() end
    DemoTree = (demo_data and demo_data.DemoTree) or DemoTree or ExampleTree_CreateDemoTree()
    PropEd:Draw(DemoTree)
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] Example App: Long Text / ShowExampleAppLongText()
----------------------------------------------------------------

local LT = { test_type = 0, log = {}, lines = 0, bytes = 0 }
function ShowExampleAppLongText(p_open)
    ImGui.SetNextWindowSize(ImVec2(520, 600), ImGuiCond.FirstUseEver)
    local visible
    p_open, visible = ImGui.Begin("Example: Long text display", p_open)
    if not visible then ImGui.End(); return p_open end
    ImGui.Text("Printing unusually long amount of text.")
    LT.test_type = ImGui.Combo("Test type", LT.test_type, "Single call to TextUnformatted()\0Multiple calls to Text(), clipped\0Multiple calls to Text(), not clipped (slow)\0")
    ImGui.Text("Buffer contents: %d lines, %d bytes", LT.lines, LT.bytes)
    if ImGui.Button("Clear") then LT.log = {}; LT.lines = 0; LT.bytes = 0; LT.text = nil end
    ImGui.SameLine()
    if ImGui.Button("Add 1000 lines") then
        for i = 0, 999 do
            local line = string.format("%i The quick brown fox jumps over the lazy dog\n", LT.lines + i)
            LT.log[#LT.log + 1] = line
            LT.bytes = LT.bytes + #line
        end
        LT.lines = LT.lines + 1000
        LT.text = nil
    end
    ImGui.BeginChild("Log")
    if LT.test_type == 0 then
        LT.text = LT.text or table.concat(LT.log)
        ImGui.TextUnformatted(LT.text)
    elseif LT.test_type == 1 then
        ImGui.PushStyleVar(ImGuiStyleVar.ItemSpacing, ImVec2(0, 0))
        local clipper = ImGuiListClipper()
        clipper:Begin(LT.lines)
        while clipper:Step() do
            for i = clipper.DisplayStart, clipper.DisplayEnd - 1 do ImGui.Text("%i The quick brown fox jumps over the lazy dog", i) end
        end
        ImGui.PopStyleVar()
    else
        ImGui.PushStyleVar(ImGuiStyleVar.ItemSpacing, ImVec2(0, 0))
        for i = 0, LT.lines - 1 do ImGui.Text("%i The quick brown fox jumps over the lazy dog", i) end
        ImGui.PopStyleVar()
    end
    ImGui.EndChild()
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] Example App: Auto Resize / ShowExampleAppAutoResize()
----------------------------------------------------------------

local AutoResizeLines = 10
function ShowExampleAppAutoResize(p_open)
    local visible
    p_open, visible = ImGui.Begin("Example: Auto-resizing window", p_open, ImGuiWindowFlags.AlwaysAutoResize)
    if not visible then ImGui.End(); return p_open end
    ImGui.TextUnformatted("Window will resize every-frame to the size of its content.\nNote that you probably don't want to query the window size to\noutput your content because that would create a feedback loop.")
    AutoResizeLines = ImGui.SliderInt("Number of lines", AutoResizeLines, 1, 20)
    for i = 0, AutoResizeLines - 1 do ImGui.Text("%sThis is line %d", string.rep(" ", i * 4), i) end
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] Example App: Constrained Resize / ShowExampleAppConstrainedResize()
----------------------------------------------------------------

local CR = { auto_resize = false, window_padding = true, type = 6, display_lines = 10 }
function ShowExampleAppConstrainedResize(p_open)
    local function AspectRatio(data) data.DesiredSize.y = math.floor(data.DesiredSize.x / data.UserData) end
    local function Square(data) local m = math.max(data.DesiredSize.x, data.DesiredSize.y); data.DesiredSize.x = m; data.DesiredSize.y = m end
    local function Step(data)
        local step = data.UserData
        data.DesiredSize = ImVec2(math.floor(data.DesiredSize.x / step + 0.5) * step, math.floor(data.DesiredSize.y / step + 0.5) * step)
    end
    local test_desc = { "Between 100x100 and 500x500", "At least 100x100", "Resize vertical + lock current width", "Resize horizontal + lock current height",
        "Width Between 400 and 500", "Height at least 400", "Custom: Aspect Ratio 16:9", "Custom: Always Square", "Custom: Fixed Steps (100)" }
    local t = CR.type
    if t == 0 then ImGui.SetNextWindowSizeConstraints(ImVec2(100, 100), ImVec2(500, 500)) end
    if t == 1 then ImGui.SetNextWindowSizeConstraints(ImVec2(100, 100), ImVec2(FLT_MAX, FLT_MAX)) end
    if t == 2 then ImGui.SetNextWindowSizeConstraints(ImVec2(-1, 0), ImVec2(-1, FLT_MAX)) end
    if t == 3 then ImGui.SetNextWindowSizeConstraints(ImVec2(0, -1), ImVec2(FLT_MAX, -1)) end
    if t == 4 then ImGui.SetNextWindowSizeConstraints(ImVec2(400, -1), ImVec2(500, -1)) end
    if t == 5 then ImGui.SetNextWindowSizeConstraints(ImVec2(-1, 400), ImVec2(-1, FLT_MAX)) end
    if t == 6 then ImGui.SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, FLT_MAX), AspectRatio, 16.0 / 9.0) end
    if t == 7 then ImGui.SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, FLT_MAX), Square) end
    if t == 8 then ImGui.SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, FLT_MAX), Step, 100.0) end

    if not CR.window_padding then ImGui.PushStyleVar(ImGuiStyleVar.WindowPadding, ImVec2(0.0, 0.0)) end
    local window_flags = CR.auto_resize and ImGuiWindowFlags.AlwaysAutoResize or 0
    local window_open
    p_open, window_open = ImGui.Begin("Example: Constrained Resize", p_open, window_flags)
    if not CR.window_padding then ImGui.PopStyleVar() end
    if window_open then
        if ImGui.GetIO().KeyShift then
            local avail_size = ImGui.GetContentRegionAvail()
            local pos = ImGui.GetCursorScreenPos()
            ImGui.ColorButton("viewport", ImVec4(0.5, 0.2, 0.5, 1.0), bit32.bor(ImGuiColorEditFlags.NoTooltip, ImGuiColorEditFlags.NoDragDrop), avail_size)
            ImGui.SetCursorScreenPos(ImVec2(pos.x + 10, pos.y + 10))
            ImGui.Text("%.2f x %.2f", avail_size.x, avail_size.y)
        else
            ImGui.Text("(Hold Shift to display a dummy viewport)")
            if ImGui.IsWindowDocked() then ImGui.Text("Warning: Sizing Constraints won't work if the window is docked!") end
            if ImGui.Button("Set 200x200") then ImGui.SetWindowSize(ImVec2(200, 200)) end ImGui.SameLine()
            if ImGui.Button("Set 500x500") then ImGui.SetWindowSize(ImVec2(500, 500)) end ImGui.SameLine()
            if ImGui.Button("Set 800x200") then ImGui.SetWindowSize(ImVec2(800, 200)) end
            ImGui.SetNextItemWidth(ImGui.GetFontSize() * 20)
            CR.type = ImGui.Combo("Constraint", CR.type, test_desc, #test_desc)
            ImGui.SetNextItemWidth(ImGui.GetFontSize() * 20)
            CR.display_lines = ImGui.DragInt("Lines", CR.display_lines, 0.2, 1, 100)
            _, CR.auto_resize = ImGui.Checkbox("Auto-resize", CR.auto_resize)
            _, CR.window_padding = ImGui.Checkbox("Window padding", CR.window_padding)
            for i = 0, CR.display_lines - 1 do ImGui.Text("%sHello, sailor! Making this line long enough for the example.", string.rep(" ", i * 4)) end
        end
    end
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] Example App: Simple overlay / ShowExampleAppSimpleOverlay()
----------------------------------------------------------------

local OverlayLocation = 0
function ShowExampleAppSimpleOverlay(p_open)
    local io = ImGui.GetIO()
    local W = ImGuiWindowFlags
    local window_flags = bit32.bor(W.NoDecoration, W.NoDocking, W.AlwaysAutoResize, W.NoSavedSettings, W.NoFocusOnAppearing, W.NoNav)
    if OverlayLocation >= 0 then
        local PAD = 10.0
        local viewport = ImGui.GetMainViewport()
        local work_pos, work_size = viewport.WorkPos, viewport.WorkSize
        local right, bottom = OverlayLocation % 2 == 1, OverlayLocation >= 2
        local window_pos = ImVec2(right and (work_pos.x + work_size.x - PAD) or (work_pos.x + PAD), bottom and (work_pos.y + work_size.y - PAD) or (work_pos.y + PAD))
        local window_pos_pivot = ImVec2(right and 1.0 or 0.0, bottom and 1.0 or 0.0)
        ImGui.SetNextWindowPos(window_pos, ImGuiCond.Always, window_pos_pivot)
        ImGui.SetNextWindowViewport(viewport.ID)
        window_flags = bit32.bor(window_flags, W.NoMove)
    elseif OverlayLocation == -2 then
        ImGui.SetNextWindowPos(ImGui.GetMainViewport():GetCenter(), ImGuiCond.Always, ImVec2(0.5, 0.5))
        window_flags = bit32.bor(window_flags, W.NoMove)
    end
    ImGui.SetNextWindowBgAlpha(0.35)
    local visible
    p_open, visible = ImGui.Begin("Example: Simple overlay", p_open, window_flags)
    if visible then
        ImGui.Text("Simple overlay\n(right-click to change position)")
        ImGui.Separator()
        if ImGui.IsMousePosValid() then ImGui.Text("Mouse Position: (%.1f,%.1f)", io.MousePos.x, io.MousePos.y) else ImGui.Text("Mouse Position: <invalid>") end
        if ImGui.BeginPopupContextWindow() then
            if ImGui.MenuItem("Custom", nil, OverlayLocation == -1) then OverlayLocation = -1 end
            if ImGui.MenuItem("Center", nil, OverlayLocation == -2) then OverlayLocation = -2 end
            if ImGui.MenuItem("Top-left", nil, OverlayLocation == 0) then OverlayLocation = 0 end
            if ImGui.MenuItem("Top-right", nil, OverlayLocation == 1) then OverlayLocation = 1 end
            if ImGui.MenuItem("Bottom-left", nil, OverlayLocation == 2) then OverlayLocation = 2 end
            if ImGui.MenuItem("Bottom-right", nil, OverlayLocation == 3) then OverlayLocation = 3 end
            if p_open ~= nil and ImGui.MenuItem("Close") then p_open = false end
            ImGui.EndPopup()
        end
    end
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] Example App: Fullscreen window / ShowExampleAppFullscreen()
----------------------------------------------------------------

local FS = { use_work_area = true, flags = bit32.bor(ImGuiWindowFlags.NoDecoration, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoSavedSettings) }
function ShowExampleAppFullscreen(p_open)
    local viewport = ImGui.GetMainViewport()
    ImGui.SetNextWindowPos(FS.use_work_area and viewport.WorkPos or viewport.Pos)
    ImGui.SetNextWindowSize(FS.use_work_area and viewport.WorkSize or viewport.Size)
    local visible
    p_open, visible = ImGui.Begin("Example: Fullscreen window", p_open, FS.flags)
    if visible then
        _, FS.use_work_area = ImGui.Checkbox("Use work area instead of main area", FS.use_work_area)
        ImGui.SameLine()
        HelpMarker("Main Area = entire viewport,\nWork Area = entire viewport minus sections used by the main menu bars, task bars etc.\n\nEnable the main-menu bar in Examples menu to see the difference.")
        local W = ImGuiWindowFlags
        _, FS.flags = ImGui.CheckboxFlags("ImGuiWindowFlags_NoBackground", FS.flags, W.NoBackground)
        _, FS.flags = ImGui.CheckboxFlags("ImGuiWindowFlags_NoDecoration", FS.flags, W.NoDecoration)
        ImGui.Indent()
        _, FS.flags = ImGui.CheckboxFlags("ImGuiWindowFlags_NoTitleBar", FS.flags, W.NoTitleBar)
        _, FS.flags = ImGui.CheckboxFlags("ImGuiWindowFlags_NoCollapse", FS.flags, W.NoCollapse)
        _, FS.flags = ImGui.CheckboxFlags("ImGuiWindowFlags_NoScrollbar", FS.flags, W.NoScrollbar)
        ImGui.Unindent()
        if p_open ~= nil and ImGui.Button("Close this window") then p_open = false end
    end
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] Example App: Manipulating window titles / ShowExampleAppWindowTitles()
----------------------------------------------------------------

function ShowExampleAppWindowTitles(p_open)
    local viewport = ImGui.GetMainViewport()
    local base_pos = viewport.Pos
    ImGui.SetNextWindowPos(ImVec2(base_pos.x + 100, base_pos.y + 100), ImGuiCond.FirstUseEver)
    ImGui.Begin("Same title as another window##1")
    ImGui.Text("This is window 1.\nMy title is the same as window 2, but my identifier is unique.")
    ImGui.End()
    ImGui.SetNextWindowPos(ImVec2(base_pos.x + 100, base_pos.y + 200), ImGuiCond.FirstUseEver)
    ImGui.Begin("Same title as another window##2")
    ImGui.Text("This is window 2.\nMy title is the same as window 1, but my identifier is unique.")
    ImGui.End()
    local spin = "|/-\\"
    local k = math.floor(ImGui.GetTime() / 0.25) % 4 + 1
    local buf = string.format("Animated title %s %d###AnimatedTitle", string.sub(spin, k, k), ImGui.GetFrameCount())
    ImGui.SetNextWindowPos(ImVec2(base_pos.x + 100, base_pos.y + 300), ImGuiCond.FirstUseEver)
    ImGui.Begin(buf)
    ImGui.Text("This window has a changing title.")
    ImGui.End()
    return p_open
end

----------------------------------------------------------------
-- [SECTION] Example App: Custom Rendering using ImDrawList API / ShowExampleAppCustomRendering()
----------------------------------------------------------------

local CRS = { sz = 42.0, base_rounding = 8.0, base_thickness = 3.0, animate_rounding = false, animate_thickness = false, ngon_segments = 6,
    circle_override = false, circle_override_v = 12, curve_override = false, curve_override_v = 8,
    colf_stroke = ImVec4(1.000, 0.384, 0.169, 1.000), colf_fill = ImVec4(0.416, 0.378, 0.420, 1.000),
    points = {}, scrolling = ImVec2(0.0, 0.0), opt_enable_grid = true, opt_enable_context_menu = true, adding_line = false,
    draw_bg = true, draw_fg = true }

local function CustomRenderingPrimitives()
    local s = CRS
    ImGui.PushItemWidth(-ImGui.GetFontSize() * 15)
    ImGui.PushItemFlag(ImGuiItemFlags.LiveEditOnInput, true)
    local draw_list = ImGui.GetWindowDrawList()

    ImGui.Text("Gradients")
    local gradient_size = ImVec2(ImGui.CalcItemWidth(), ImGui.GetFrameHeight())
    ImGui.InvisibleButton("##gradient1", gradient_size)
    local col_a, col_b = ImGui.GetColorU32(IM_COL32(0, 0, 0, 255), nil, true), ImGui.GetColorU32(IM_COL32(255, 255, 255, 255), nil, true)
    draw_list:AddRectFilledMultiColor(ImGui.GetItemRectMin(), ImGui.GetItemRectMax(), col_a, col_b, col_b, col_a)
    ImGui.InvisibleButton("##gradient2", gradient_size)
    col_a, col_b = ImGui.GetColorU32(IM_COL32(0, 255, 0, 255), nil, true), ImGui.GetColorU32(IM_COL32(255, 0, 0, 255), nil, true)
    draw_list:AddRectFilledMultiColor(ImGui.GetItemRectMin(), ImGui.GetItemRectMax(), col_a, col_b, col_b, col_a)

    ImGui.Text("All primitives")
    s.sz = ImGui.DragFloat("Size", s.sz, 0.2, 0.2, 100.0, "%.0f")
    local t = ImGui.GetTime()
    local rounding_wave = 1.0 - math.abs((t % 3.0) * (2.0 / 3.0) - 1.0)
    local rounding = s.animate_rounding and (math.floor(rounding_wave * s.base_rounding * 10.0) / 10.0) or s.base_rounding
    s.base_rounding = ImGui.DragFloat("Rounding", s.base_rounding, 0.02, 0.0, 32.0, "%.1f"); ImGui.SameLine()
    _, s.animate_rounding = ImGui.Checkbox("Animate##rounding", s.animate_rounding); ImGui.SameLine()
    ImGui.Text("%.2f", rounding)
    local thickness_wave = 1.0 - math.abs((t % 5.0) * (2.0 / 5.0) - 1.0)
    local thickness = s.animate_thickness and (thickness_wave * s.base_thickness) or s.base_thickness
    s.base_thickness = ImGui.DragFloat("Thickness", s.base_thickness, 0.02, 0.0, 32.0, "%.02f"); ImGui.SameLine()
    _, s.animate_thickness = ImGui.Checkbox("Animate##thickness", s.animate_thickness); ImGui.SameLine()
    ImGui.Text("%.2f", thickness)
    s.ngon_segments = ImGui.SliderInt("N-gon sides", s.ngon_segments, 3, 12)
    local changed
    _, s.circle_override = ImGui.Checkbox("##CircleSegmentOverride", s.circle_override)
    ImGui.SameLine(0.0, ImGui.GetStyle().ItemInnerSpacing.x)
    s.circle_override_v, changed = ImGui.SliderInt("Circle segments override", s.circle_override_v, 3, 30)
    s.circle_override = s.circle_override or changed
    _, s.curve_override = ImGui.Checkbox("##CurvesSegmentOverride", s.curve_override)
    ImGui.SameLine(0.0, ImGui.GetStyle().ItemInnerSpacing.x)
    s.curve_override_v, changed = ImGui.SliderInt("Curves segments override", s.curve_override_v, 3, 30)
    s.curve_override = s.curve_override or changed
    ImGui.ColorEdit4("Stroke Color", s.colf_stroke)
    ImGui.ColorEdit4("Fill Color", s.colf_fill)
    ImGui.SeparatorText("Per primitive flags (AddXXX functions)")
    ImGui.TextDisabled("(stroke placement/AA flags: not ported, this port uses the 1.92 stroker)")
    ImGui.Spacing()

    local sz = s.sz
    local start_pos = ImGui.GetCursorScreenPos()
    local pi = 3.141592
    local step = sz + 10.0
    local corners_tl_br = bit32.bor(ImDrawFlags.RoundCornersTopLeft, ImDrawFlags.RoundCornersBottomRight)
    local half_sz = sz * 0.5
    local circle_segments = s.circle_override and s.circle_override_v or 0
    local curve_segments = s.curve_override and s.curve_override_v or 0
    local cp3 = { ImVec2(0.0, sz * 0.6), ImVec2(sz * 0.5, -sz * 0.4), ImVec2(sz, sz) }
    local cp4 = { ImVec2(0.0, 0.0), ImVec2(sz * 1.3, sz * 0.3), ImVec2(sz - sz * 1.3, sz - sz * 0.3), ImVec2(sz, sz) }
    local concave_shape = { { 0.0, 0.0 }, { 0.3, 0.0 }, { 0.3, 0.7 }, { 0.7, 0.7 }, { 0.7, 0.0 }, { 1.0, 0.0 }, { 1.0, 1.0 }, { 0.0, 1.0 } }
    local zigzag_shape = { { 0.0, 0.0 }, { 0.9, 0.0 }, { 1.0, 0.1 }, { 1.0, 0.9 }, { 0.9, 1.0 }, { 0.3, 1.0 }, { 0.3, 0.4 }, { 0.9, 0.4 } }
    local rotating_square = {}
    for side = 0, 3 do
        local a = t * 0.1 + side * pi * 0.5
        rotating_square[side + 1] = ImVec2(math.cos(a) * half_sz, math.sin(a) * half_sz)
    end
    local function Shape(shape, x, y)
        for _, p in ipairs(shape) do draw_list:PathLineTo(ImVec2(x + math.floor(sz * p[1]), y + math.floor(sz * p[2]))) end
    end

    local y = start_pos.y
    for row = 0, 3 do
        local x = start_pos.x
        local draw_fill = (row == 2 or row == 3)
        local draw_strokes = (row == 0 or row == 1 or row == 3)
        if draw_fill then
            local col = ImGui.ColorConvertFloat4ToU32(s.colf_fill)
            draw_list:AddNgonFilled(ImVec2(x + half_sz, y + half_sz), half_sz, col, s.ngon_segments); x = x + step
            draw_list:AddCircleFilled(ImVec2(x + half_sz, y + half_sz), half_sz, col, circle_segments); x = x + step
            draw_list:AddEllipseFilled(ImVec2(x + half_sz, y + half_sz), ImVec2(half_sz, sz * 0.3), col, -0.3, circle_segments); x = x + step
            draw_list:AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + sz), col); x = x + step
            draw_list:AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + sz), col, rounding); x = x + step
            draw_list:AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + sz), col, rounding, corners_tl_br); x = x + step
            draw_list:AddTriangleFilled(ImVec2(x + sz * 0.5, y), ImVec2(x + sz, y + sz), ImVec2(x, y + sz), col); x = x + step
            draw_list:AddTriangleFilled(ImVec2(x + sz * 0.2, y), ImVec2(x + sz * 0.4, y + sz), ImVec2(x, y + sz), col); x = x + step - math.floor(sz * 0.6)
            Shape(concave_shape, x, y); draw_list:PathFillConcave(col); x = x + step
            Shape(zigzag_shape, x, y); draw_list:PathFillConcave(col); x = x + step
            draw_list:AddRectFilled(ImVec2(x, y), ImVec2(x + sz, y + thickness), col); x = x + step
            draw_list:AddRectFilled(ImVec2(x, y), ImVec2(x + thickness, y + sz), col); x = x + step - math.floor(half_sz)
            if not (draw_fill and draw_strokes) then
                local block_sz, off = 1, 0
                while block_sz < 16 and off + block_sz <= sz do
                    draw_list:AddRectFilled(ImVec2(x, y + off), ImVec2(x + block_sz, y + off + block_sz), col)
                    off = off + block_sz + 1
                    block_sz = block_sz + 1
                end
            end
            x = x + step - math.floor(half_sz)
            for n = 1, 4 do draw_list:PathLineTo(ImVec2(x + half_sz + rotating_square[n].x, y + half_sz + rotating_square[n].y)) end
            draw_list:PathFillConvex(col); x = x + step
            draw_list:PathArcTo(ImVec2(x + half_sz, y + half_sz), half_sz, pi * -0.5, pi * 1.1)
            draw_list:PathFillConvex(col); x = x + step
            draw_list:PathLineTo(ImVec2(x + cp3[1].x, y + cp3[1].y))
            draw_list:PathBezierQuadraticCurveTo(ImVec2(x + cp3[2].x, y + cp3[2].y), ImVec2(x + cp3[3].x, y + cp3[3].y), curve_segments)
            draw_list:PathFillConvex(col); x = x + step
            if not (draw_fill and draw_strokes) then
                draw_list:AddRectFilledMultiColor(ImVec2(x, y), ImVec2(x + sz, y + sz), IM_COL32(0, 0, 0, 255), IM_COL32(255, 0, 0, 255), IM_COL32(255, 255, 0, 255), IM_COL32(0, 255, 0, 255))
                x = x + step
            end
        end
        if draw_fill and draw_strokes then x = start_pos.x end
        if draw_strokes then
            local col = ImGui.ColorConvertFloat4ToU32(s.colf_stroke)
            local th = (row == 0) and 1.0 or thickness
            draw_list:AddNgon(ImVec2(x + half_sz, y + half_sz), half_sz, col, s.ngon_segments, th); x = x + step
            draw_list:AddCircle(ImVec2(x + half_sz, y + half_sz), half_sz, col, circle_segments, th); x = x + step
            draw_list:AddEllipse(ImVec2(x + half_sz, y + half_sz), ImVec2(half_sz, sz * 0.3), col, -0.3, circle_segments, th); x = x + step
            draw_list:AddRect(ImVec2(x, y), ImVec2(x + sz, y + sz), col, 0.0, th); x = x + step
            draw_list:AddRect(ImVec2(x, y), ImVec2(x + sz, y + sz), col, rounding, th); x = x + step
            draw_list:AddRect(ImVec2(x, y), ImVec2(x + sz, y + sz), col, rounding, th, corners_tl_br); x = x + step
            draw_list:AddTriangle(ImVec2(x + sz * 0.5, y), ImVec2(x + sz, y + sz), ImVec2(x, y + sz), col, th); x = x + step
            draw_list:AddTriangle(ImVec2(x + sz * 0.2, y), ImVec2(x + sz * 0.4, y + sz), ImVec2(x, y + sz), col, th); x = x + step - math.floor(sz * 0.6)
            Shape(concave_shape, x, y); draw_list:PathStroke(col, th, ImDrawFlags.Closed); x = x + step
            Shape(zigzag_shape, x, y); draw_list:PathStroke(col, th, ImDrawFlags.Closed); x = x + step
            local off = math.floor(sz * 0.4)
            draw_list:AddLine(ImVec2(x, y), ImVec2(x + sz, y), col, th)
            draw_list:AddLine(ImVec2(x, y + off), ImVec2(x + sz, y + off), col, th); x = x + step
            draw_list:AddLine(ImVec2(x, y), ImVec2(x, y + sz), col, th)
            draw_list:AddLine(ImVec2(x + off, y + sz), ImVec2(x + off, y), col, th); x = x + step - math.floor(half_sz)
            if not (draw_fill and draw_strokes) then
                draw_list:AddLine(ImVec2(x, y), ImVec2(x + half_sz, y + sz), col, th)
                draw_list:AddLine(ImVec2(x, y + sz), ImVec2(x + half_sz, y), col, th)
            end
            x = x + step - math.floor(half_sz)
            for n = 1, 4 do draw_list:PathLineTo(ImVec2(x + half_sz + rotating_square[n].x, y + half_sz + rotating_square[n].y)) end
            draw_list:PathStroke(col, th, ImDrawFlags.Closed); x = x + step
            draw_list:PathArcTo(ImVec2(x + half_sz, y + half_sz), half_sz, pi * -0.5, pi * 1.1)
            draw_list:PathStroke(col, th); x = x + step
            draw_list:AddBezierQuadratic(ImVec2(x + cp3[1].x, y + cp3[1].y), ImVec2(x + cp3[2].x, y + cp3[2].y), ImVec2(x + cp3[3].x, y + cp3[3].y), col, th, curve_segments); x = x + step
            if not (draw_fill and draw_strokes) then
                draw_list:AddBezierCubic(ImVec2(x + cp4[1].x, y + cp4[1].y), ImVec2(x + cp4[2].x, y + cp4[2].y), ImVec2(x + cp4[3].x, y + cp4[3].y), ImVec2(x + cp4[4].x, y + cp4[4].y), col, th, curve_segments)
                x = x + step
            end
        end
        y = y + step
    end
    ImGui.Dummy(ImVec2(step * 15.5, step * 4.0))
    ImGui.Text("ImDrawList Vector Rendering Reference:")
    ImGui.TextLinkOpenURL("https://github.com/ocornut/imgui/wiki/Draw-List")
    ImGui.PopItemFlag()
    ImGui.PopItemWidth()
end

local function CustomRenderingCanvas()
    local s = CRS
    _, s.opt_enable_grid = ImGui.Checkbox("Enable grid", s.opt_enable_grid)
    _, s.opt_enable_context_menu = ImGui.Checkbox("Enable context menu", s.opt_enable_context_menu)
    ImGui.Text("Mouse Left: drag to add lines,\nMouse Right: drag to scroll, click for context menu.")
    local canvas_p0 = ImGui.GetCursorScreenPos()
    local canvas_sz = ImGui.GetContentRegionAvail()
    if canvas_sz.x < 50.0 then canvas_sz.x = 50.0 end
    if canvas_sz.y < 50.0 then canvas_sz.y = 50.0 end
    local canvas_p1 = ImVec2(canvas_p0.x + canvas_sz.x, canvas_p0.y + canvas_sz.y)
    local io = ImGui.GetIO()
    local draw_list = ImGui.GetWindowDrawList()
    draw_list:AddRectFilled(canvas_p0, canvas_p1, IM_COL32(50, 50, 50, 255))
    draw_list:AddRect(canvas_p0, canvas_p1, IM_COL32(255, 255, 255, 255))

    ImGui.InvisibleButton("canvas", canvas_sz, bit32.bor(ImGuiButtonFlags.MouseButtonLeft, ImGuiButtonFlags.MouseButtonRight))
    local is_hovered = ImGui.IsItemHovered()
    local is_active = ImGui.IsItemActive()
    local origin = ImVec2(canvas_p0.x + s.scrolling.x, canvas_p0.y + s.scrolling.y)
    local mouse_pos_in_canvas = ImVec2(io.MousePos.x - origin.x, io.MousePos.y - origin.y)
    local points = s.points
    if is_hovered and not s.adding_line and ImGui.IsMouseClicked(ImGuiMouseButton.Left) then
        points[#points + 1] = ImVec2(mouse_pos_in_canvas.x, mouse_pos_in_canvas.y)
        points[#points + 1] = ImVec2(mouse_pos_in_canvas.x, mouse_pos_in_canvas.y)
        s.adding_line = true
    end
    if s.adding_line then
        points[#points] = ImVec2(mouse_pos_in_canvas.x, mouse_pos_in_canvas.y)
        if not ImGui.IsMouseDown(ImGuiMouseButton.Left) then s.adding_line = false end
    end
    local mouse_threshold_for_pan = s.opt_enable_context_menu and -1.0 or 0.0
    if is_active and ImGui.IsMouseDragging(ImGuiMouseButton.Right, mouse_threshold_for_pan) then
        s.scrolling.x = s.scrolling.x + io.MouseDelta.x
        s.scrolling.y = s.scrolling.y + io.MouseDelta.y
    end
    local drag_delta = ImGui.GetMouseDragDelta(ImGuiMouseButton.Right)
    if s.opt_enable_context_menu and drag_delta.x == 0.0 and drag_delta.y == 0.0 then
        ImGui.OpenPopupOnItemClick("context", ImGuiPopupFlags.MouseButtonRight)
    end
    if ImGui.BeginPopup("context") then
        if s.adding_line then points[#points] = nil; points[#points] = nil end
        s.adding_line = false
        if ImGui.MenuItem("Remove one", nil, false, #points > 0) then points[#points] = nil; points[#points] = nil end
        if ImGui.MenuItem("Remove all", nil, false, #points > 0) then table.clear(points) end
        ImGui.EndPopup()
    end
    draw_list:PushClipRect(canvas_p0, canvas_p1, true)
    if s.opt_enable_grid then
        local GRID_STEP = 64.0
        local x = math.fmod(s.scrolling.x, GRID_STEP)
        while x < canvas_sz.x do draw_list:AddLine(ImVec2(canvas_p0.x + x, canvas_p0.y), ImVec2(canvas_p0.x + x, canvas_p1.y), IM_COL32(200, 200, 200, 40)); x = x + GRID_STEP end
        local y = math.fmod(s.scrolling.y, GRID_STEP)
        while y < canvas_sz.y do draw_list:AddLine(ImVec2(canvas_p0.x, canvas_p0.y + y), ImVec2(canvas_p1.x, canvas_p0.y + y), IM_COL32(200, 200, 200, 40)); y = y + GRID_STEP end
    end
    for n = 1, #points - 1, 2 do
        draw_list:AddLine(ImVec2(origin.x + points[n].x, origin.y + points[n].y), ImVec2(origin.x + points[n + 1].x, origin.y + points[n + 1].y), IM_COL32(255, 255, 0, 255), 2.0)
    end
    draw_list:PopClipRect()
end

function ShowExampleAppCustomRendering(p_open)
    local visible
    p_open, visible = ImGui.Begin("Example: Custom rendering", p_open)
    if not visible then ImGui.End(); return p_open end
    local s = CRS
    if ImGui.BeginTabBar("##TabBar") then
        if ImGui.BeginTabItem("Primitives") then CustomRenderingPrimitives(); ImGui.EndTabItem() end
        if ImGui.BeginTabItem("Canvas") then CustomRenderingCanvas(); ImGui.EndTabItem() end
        if ImGui.BeginTabItem("BG/FG draw lists") then
            _, s.draw_bg = ImGui.Checkbox("Draw in Background draw list", s.draw_bg)
            ImGui.SameLine(); HelpMarker("The Background draw list will be rendered below every Dear ImGui windows.")
            _, s.draw_fg = ImGui.Checkbox("Draw in Foreground draw list", s.draw_fg)
            ImGui.SameLine(); HelpMarker("The Foreground draw list will be rendered over every Dear ImGui windows.")
            local window_pos, window_size = ImGui.GetWindowPos(), ImGui.GetWindowSize()
            local window_center = ImVec2(window_pos.x + window_size.x * 0.5, window_pos.y + window_size.y * 0.5)
            if s.draw_bg then ImGui.GetBackgroundDrawList():AddCircle(window_center, window_size.x * 0.6, IM_COL32(255, 0, 0, 200), 0, 10 + 4) end
            if s.draw_fg then ImGui.GetForegroundDrawList():AddCircle(window_center, window_size.y * 0.6, IM_COL32(0, 255, 0, 200), 0, 10) end
            ImGui.EndTabItem()
        end
        if ImGui.BeginTabItem("Draw Channels") then
            local draw_list = ImGui.GetWindowDrawList()
            ImGui.Text("Blue shape is drawn first: appears in back")
            ImGui.Text("Red shape is drawn after: appears in front")
            local p0 = ImGui.GetCursorScreenPos()
            draw_list:AddRectFilled(ImVec2(p0.x, p0.y), ImVec2(p0.x + 50, p0.y + 50), IM_COL32(0, 0, 255, 255))
            draw_list:AddRectFilled(ImVec2(p0.x + 25, p0.y + 25), ImVec2(p0.x + 75, p0.y + 75), IM_COL32(255, 0, 0, 255))
            ImGui.Dummy(ImVec2(75, 75))
            ImGui.Separator()
            ImGui.Text("Blue shape is drawn first, into channel 1: appears in front")
            ImGui.Text("Red shape is drawn after, into channel 0: appears in back")
            local p1 = ImGui.GetCursorScreenPos()
            draw_list:ChannelsSplit(2)
            draw_list:ChannelsSetCurrent(1)
            draw_list:AddRectFilled(ImVec2(p1.x, p1.y), ImVec2(p1.x + 50, p1.y + 50), IM_COL32(0, 0, 255, 255))
            draw_list:ChannelsSetCurrent(0)
            draw_list:AddRectFilled(ImVec2(p1.x + 25, p1.y + 25), ImVec2(p1.x + 75, p1.y + 75), IM_COL32(255, 0, 0, 255))
            draw_list:ChannelsMerge()
            ImGui.Dummy(ImVec2(75, 75))
            ImGui.Text("After reordering, contents of channel 0 appears below channel 1.")
            ImGui.EndTabItem()
        end
        ImGui.EndTabBar()
    end
    ImGui.End()
    return p_open
end

return true
end

__FILES['imgui_demo_widgets.lua'] = function()
-- Demo: DemoWindowWidgets*() sections (port of imgui_demo.cpp). Globals picked up by DemoWindowWidgets() in imgui_demo.lua.
local _
local function HSV(h, s, v, a) local r, g, b = ImGui.ColorConvertHSVtoRGB(h, s, v) return ImVec4(r, g, b, a or 1.0) end
local Buf, BufStr = DemoBuf, DemoBufStr
local S = {} -- statics, one subtable per section

local ExampleNames = {
    "Artichoke", "Arugula", "Asparagus", "Avocado", "Bamboo Shoots", "Bean Sprouts", "Beans", "Beet", "Belgian Endive", "Bell Pepper",
    "Bitter Gourd", "Bok Choy", "Broccoli", "Brussels Sprouts", "Burdock Root", "Cabbage", "Calabash", "Capers", "Carrot", "Cassava",
    "Cauliflower", "Celery", "Celery Root", "Celcuce", "Chayote", "Chinese Broccoli", "Corn", "Cucumber" }

S.basic = { clicked = 0, check = true, e = 0, counter = 0, str0 = Buf("Hello, world!", 128), str1 = Buf("", 128),
    i0 = 123, f0 = 0.001, d0 = 999999.00000001, f1 = 1.e10, vec4a = { 0.10, 0.20, 0.30, 0.44 },
    di1 = 50, di2 = 42, di3 = 128, df1 = 1.0, df2 = 0.0067, si1 = 0, sf1 = 0.123, sf2 = 0.0, angle = 0.0, elem = 0,
    col1 = { 1.0, 0.0, 0.2 }, col2 = { 0.4, 0.7, 0.0, 0.5 }, combo = 0, listbox = 1 }

function DemoWindowWidgetsBasic()
    if not ImGui.TreeNode("Basic") then return end
    local s = S.basic
    ImGui.SeparatorText("General")
    if ImGui.Button("Button") then s.clicked = s.clicked + 1 end
    if s.clicked % 2 == 1 then ImGui.SameLine(); ImGui.Text("Thanks for clicking me!") end
    _, s.check = ImGui.Checkbox("checkbox", s.check)
    _, s.e = ImGui.RadioButton("radio a", s.e, 0); ImGui.SameLine()
    _, s.e = ImGui.RadioButton("radio b", s.e, 1); ImGui.SameLine()
    _, s.e = ImGui.RadioButton("radio c", s.e, 2)
    ImGui.AlignTextToFramePadding()
    ImGui.TextLinkOpenURL("Hyperlink", "https://github.com/ocornut/imgui/wiki/Error-Handling")
    for i = 0, 6 do
        if i > 0 then ImGui.SameLine() end
        ImGui.PushID(i)
        ImGui.PushStyleColor(ImGuiCol.Button, HSV(i / 7.0, 0.6, 0.6))
        ImGui.PushStyleColor(ImGuiCol.ButtonHovered, HSV(i / 7.0, 0.7, 0.7))
        ImGui.PushStyleColor(ImGuiCol.ButtonActive, HSV(i / 7.0, 0.8, 0.8))
        ImGui.Button("Click")
        ImGui.PopStyleColor(3)
        ImGui.PopID()
    end
    ImGui.AlignTextToFramePadding()
    ImGui.Text("Hold to repeat:")
    ImGui.SameLine()
    local spacing = ImGui.GetStyle().ItemInnerSpacing.x
    ImGui.PushItemFlag(ImGuiItemFlags.ButtonRepeat, true)
    if ImGui.ArrowButton("##left", ImGuiDir.Left) then s.counter = s.counter - 1 end
    ImGui.SameLine(0.0, spacing)
    if ImGui.ArrowButton("##right", ImGuiDir.Right) then s.counter = s.counter + 1 end
    ImGui.PopItemFlag()
    ImGui.SameLine()
    ImGui.Text("%d", s.counter)
    ImGui.Button("Tooltip")
    ImGui.SetItemTooltip("I am a tooltip")
    ImGui.LabelText("label", "Value")

    ImGui.SeparatorText("Inputs")
    ImGui.InputText("input text", s.str0, 128)
    ImGui.SameLine(); HelpMarker("USER:\nHold Shift or use mouse to select text.\nCtrl+Left/Right to word jump.\nCtrl+A or Double-Click to select all.\nCtrl+X,Ctrl+C,Ctrl+V for clipboard.\nCtrl+Z to undo, Ctrl+Y/Ctrl+Shift+Z to redo.\nEscape to revert.")
    ImGui.InputTextWithHint("input text (w/ hint)", "enter text here", s.str1, 128)
    s.i0 = ImGui.InputInt("input int", s.i0)
    s.f0 = ImGui.InputFloat("input float", s.f0, 0.01, 1.0, "%.3f")
    s.d0 = ImGui.InputDouble("input double", s.d0, 0.01, 1.0, "%.8f")
    s.f1 = ImGui.InputFloat("input scientific", s.f1, 0.0, 0.0, "%e")
    ImGui.SameLine(); HelpMarker("You can input value using the scientific notation,\n  e.g. \"1e+8\" becomes \"100000000\".")
    ImGui.InputFloat3("input float3", s.vec4a)

    ImGui.SeparatorText("Drags")
    s.di1 = ImGui.DragInt("drag int", s.di1, 1)
    ImGui.SameLine(); HelpMarker("Click and drag to edit value.\nHold Shift/Alt for faster/slower edit.\nDouble-Click or Ctrl+Click to input value.")
    s.di2 = ImGui.DragInt("drag int 0..100", s.di2, 1, 0, 100, "%d%%", ImGuiSliderFlags.AlwaysClamp)
    s.di3 = ImGui.DragInt("drag int wrap 100..200", s.di3, 1, 100, 200, "%d", ImGuiSliderFlags.WrapAround)
    s.df1 = ImGui.DragFloat("drag float", s.df1, 0.005)
    s.df2 = ImGui.DragFloat("drag small float", s.df2, 0.0001, 0.0, 0.0, "%.06f ns")

    ImGui.SeparatorText("Sliders")
    s.si1 = ImGui.SliderInt("slider int", s.si1, -1, 3)
    ImGui.SameLine(); HelpMarker("Ctrl+Click to input value.")
    s.sf1 = ImGui.SliderFloat("slider float", s.sf1, 0.0, 1.0, "ratio = %.3f")
    s.sf2 = ImGui.SliderFloat("slider float (log)", s.sf2, -10.0, 10.0, "%.4f", ImGuiSliderFlags.Logarithmic)
    s.angle = ImGui.SliderAngle("slider angle", s.angle)
    local elems_names = { "Fire", "Earth", "Air", "Water" }
    local elem_name = elems_names[s.elem + 1] or "Unknown"
    s.elem = ImGui.SliderInt("slider enum", s.elem, 0, 3, elem_name)
    ImGui.SameLine(); HelpMarker("Using the format string parameter to display a name instead of the underlying integer.")

    ImGui.SeparatorText("Selectors/Pickers")
    ImGui.ColorEdit3("color 1", s.col1)
    ImGui.SameLine(); HelpMarker("Click on the color square to open a color picker.\nClick and hold to use drag and drop.\nRight-Click on the color square to show options.\nCtrl+Click on individual component to input value.\n")
    ImGui.ColorEdit4("color 2", s.col2)
    s.combo = ImGui.Combo("combo", s.combo, { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIIIIII", "JJJJ", "KKKKKKK" })
    ImGui.SameLine(); HelpMarker("Using the simplified one-liner Combo API here.")
    s.listbox = ImGui.ListBox("listbox", s.listbox, { "Apple", "Banana", "Cherry", "Kiwi", "Mango", "Orange", "Pineapple", "Strawberry", "Watermelon" }, 9, 4)
    ImGui.SameLine(); HelpMarker("Using the simplified one-liner ListBox API here.")
    ImGui.TreePop()
end

S.chdr = { closable_group = true }
function DemoWindowWidgetsBullets()
    if not ImGui.TreeNode("Bullets") then return end
    ImGui.BulletText("Bullet point 1")
    ImGui.BulletText("Bullet point 2\nOn multiple lines")
    if ImGui.TreeNode("Tree node") then ImGui.BulletText("Another bullet point"); ImGui.TreePop() end
    ImGui.Bullet(); ImGui.Text("Bullet point 3 (two calls)")
    ImGui.Bullet(); ImGui.SmallButton("Button")
    ImGui.TreePop()
end

function DemoWindowWidgetsCollapsingHeaders()
    if not ImGui.TreeNode("Collapsing Headers") then return end
    local s = S.chdr
    _, s.closable_group = ImGui.Checkbox("Show 2nd header", s.closable_group)
    if ImGui.CollapsingHeader("Header", ImGuiTreeNodeFlags.None) then
        ImGui.Text("IsItemHovered: %d", ImGui.IsItemHovered() and 1 or 0)
        for i = 0, 4 do ImGui.Text("Some content %d", i) end
    end
    local open
    open, s.closable_group = ImGui.CollapsingHeader("Header with a close button", s.closable_group)
    if open then
        ImGui.Text("IsItemHovered: %d", ImGui.IsItemHovered() and 1 or 0)
        for i = 0, 4 do ImGui.Text("More content %d", i) end
    end
    ImGui.TreePop()
end

IMGUI_PAYLOAD_TYPE_COLOR_3F = IMGUI_PAYLOAD_TYPE_COLOR_3F or "_COL3F"
IMGUI_PAYLOAD_TYPE_COLOR_4F = IMGUI_PAYLOAD_TYPE_COLOR_4F or "_COL4F"

S.color = { color = ImVec4(114.0 / 255.0, 144.0 / 255.0, 154.0 / 255.0, 200.0 / 255.0), base_flags = 0, palette = nil,
    backup = ImVec4(), no_border = false, ref_color = false, ref_color_v = ImVec4(1.0, 0.0, 1.0, 0.5), picker_mode = 0,
    display_mode = 0, picker_flags = ImGuiColorEditFlags.AlphaBar, hsv = ImVec4(0.23, 1.0, 1.0, 1.0) }

function DemoWindowWidgetsColorAndPickers()
    if not ImGui.TreeNode("Color/Picker Widgets") then return end
    local s = S.color
    local CE = ImGuiColorEditFlags
    local color = s.color

    ImGui.SeparatorText("Options")
    _, s.base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_NoAlpha", s.base_flags, CE.NoAlpha)
    _, s.base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_AlphaOpaque", s.base_flags, CE.AlphaOpaque)
    _, s.base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_AlphaNoBg", s.base_flags, CE.AlphaNoBg)
    _, s.base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_AlphaPreviewHalf", s.base_flags, CE.AlphaPreviewHalf)
    _, s.base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_NoOptions", s.base_flags, CE.NoOptions); ImGui.SameLine(); HelpMarker("Right-click on the individual color widget to show options.")
    _, s.base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_NoDragDrop", s.base_flags, CE.NoDragDrop)
    if CE.NoColorMarkers then _, s.base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_NoColorMarkers", s.base_flags, CE.NoColorMarkers) end
    _, s.base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_HDR", s.base_flags, CE.HDR); ImGui.SameLine(); HelpMarker("Currently all this does is to lift the 0..1 limits on dragging widgets.")
    local base_flags = s.base_flags

    ImGui.SeparatorText("Inline color editor")
    ImGui.Text("Color widget:")
    ImGui.SameLine(); HelpMarker("Click on the color square to open a color picker.\nCtrl+Click on individual component to input value.\n")
    ImGui.ColorEdit3("MyColor##1", color, base_flags)
    ImGui.Text("Color widget HSV with Alpha:")
    ImGui.ColorEdit4("MyColor##2", color, bit32.bor(CE.DisplayHSV, base_flags))
    ImGui.Text("Color widget with Float Display:")
    ImGui.ColorEdit4("MyColor##2f", color, bit32.bor(CE.Float, base_flags))
    ImGui.Text("Color button with Picker:")
    ImGui.SameLine(); HelpMarker("With the ImGuiColorEditFlags_NoInputs flag you can hide all the slider/text inputs.\nWith the ImGuiColorEditFlags_NoLabel flag you can pass a non-empty label which will only be used for the tooltip and picker popup.")
    ImGui.ColorEdit4("MyColor##3", color, bit32.bor(CE.NoInputs, CE.NoLabel, base_flags))

    ImGui.Text("Color button with Custom Picker Popup:")
    if s.palette == nil then
        s.palette = {}
        for n = 0, 31 do s.palette[n] = HSV(n / 31.0, 0.8, 0.8, 1.0) end
    end
    local open_popup = ImGui.ColorButton("MyColor##3b", color, base_flags)
    ImGui.SameLine(0, ImGui.GetStyle().ItemInnerSpacing.x)
    open_popup = ImGui.Button("Palette") or open_popup
    if open_popup then
        ImGui.OpenPopup("mypicker")
        ImVec4_Copy(s.backup, color)
    end
    if ImGui.BeginPopup("mypicker") then
        ImGui.Text("MY CUSTOM COLOR PICKER WITH AN AMAZING PALETTE!")
        ImGui.Separator()
        ImGui.ColorPicker4("##picker", color, bit32.bor(base_flags, CE.NoSidePreview, CE.NoSmallPreview))
        ImGui.SameLine()
        ImGui.BeginGroup()
        ImGui.Text("Current")
        ImGui.ColorButton("##current", color, bit32.bor(CE.NoPicker, CE.AlphaPreviewHalf), ImVec2(60, 40))
        ImGui.Text("Previous")
        if ImGui.ColorButton("##previous", s.backup, bit32.bor(CE.NoPicker, CE.AlphaPreviewHalf), ImVec2(60, 40)) then
            ImVec4_Copy(color, s.backup)
        end
        ImGui.Separator()
        ImGui.Text("Palette")
        for n = 0, 31 do
            ImGui.PushID(n)
            if n % 8 ~= 0 then ImGui.SameLine(0.0, ImGui.GetStyle().ItemSpacing.y) end
            local pal = s.palette[n]
            if ImGui.ColorButton("##palette", pal, bit32.bor(CE.NoAlpha, CE.NoPicker, CE.NoTooltip), ImVec2(20, 20)) then
                color.x = pal.x; color.y = pal.y; color.z = pal.z -- Preserve alpha!
            end
            if ImGui.BeginDragDropTarget() then
                local payload = ImGui.AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_3F)
                if payload and payload.Data then pal.x, pal.y, pal.z = payload.Data[1], payload.Data[2], payload.Data[3] end
                payload = ImGui.AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_4F)
                if payload and payload.Data then pal.x, pal.y, pal.z, pal.w = payload.Data[1], payload.Data[2], payload.Data[3], payload.Data[4] end
                ImGui.EndDragDropTarget()
            end
            ImGui.PopID()
        end
        ImGui.EndGroup()
        ImGui.EndPopup()
    end

    ImGui.Text("Color button only:")
    _, s.no_border = ImGui.Checkbox("ImGuiColorEditFlags_NoBorder", s.no_border)
    ImGui.ColorButton("MyColor##3c", color, bit32.bor(base_flags, s.no_border and CE.NoBorder or 0), ImVec2(80, 80))

    ImGui.SeparatorText("Color picker")
    ImGui.PushID("Color picker")
    _, s.picker_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_NoAlpha", s.picker_flags, CE.NoAlpha)
    _, s.picker_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_AlphaBar", s.picker_flags, CE.AlphaBar)
    _, s.picker_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_NoSidePreview", s.picker_flags, CE.NoSidePreview)
    if bit32.band(s.picker_flags, CE.NoSidePreview) ~= 0 then
        ImGui.SameLine()
        _, s.ref_color = ImGui.Checkbox("With Ref Color", s.ref_color)
        if s.ref_color then
            ImGui.SameLine()
            ImGui.ColorEdit4("##RefColor", s.ref_color_v, bit32.bor(CE.NoInputs, base_flags))
        end
    end
    _, s.picker_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags_PickerNoRotate", s.picker_flags, CE.PickerNoRotate)
    s.picker_mode = ImGui.Combo("Picker Mode", s.picker_mode, "Auto/Current\0ImGuiColorEditFlags_PickerHueBar\0ImGuiColorEditFlags_PickerHueWheel\0")
    ImGui.SameLine(); HelpMarker("When not specified explicitly, user can right-click the picker to change mode.")
    s.display_mode = ImGui.Combo("Display Mode", s.display_mode, "Auto/Current\0ImGuiColorEditFlags_NoInputs\0ImGuiColorEditFlags_DisplayRGB\0ImGuiColorEditFlags_DisplayHSV\0ImGuiColorEditFlags_DisplayHex\0")
    ImGui.SameLine(); HelpMarker("ColorEdit defaults to displaying RGB inputs if you don't specify a display mode, but the user can change it with a right-click on those inputs.\n\nColorPicker defaults to displaying RGB+HSV+Hex if you don't specify a display mode.\n\nYou can change the defaults using io.ConfigColorEditFlags.")
    local flags = bit32.bor(base_flags, s.picker_flags)
    if s.picker_mode == 1 then flags = bit32.bor(flags, CE.PickerHueBar) end
    if s.picker_mode == 2 then flags = bit32.bor(flags, CE.PickerHueWheel) end
    if s.display_mode == 1 then flags = bit32.bor(flags, CE.NoInputs) end
    if s.display_mode == 2 then flags = bit32.bor(flags, CE.DisplayRGB) end
    if s.display_mode == 3 then flags = bit32.bor(flags, CE.DisplayHSV) end
    if s.display_mode == 4 then flags = bit32.bor(flags, CE.DisplayHex) end
    ImGui.ColorPicker4("MyColor##4", color, flags, s.ref_color and s.ref_color_v or nil)

    ImGui.Text("Set defaults in code:")
    ImGui.SameLine(); HelpMarker("io.ConfigColorEditFlags is designed to allow you to set boot-time default.")
    if ImGui.Button("Overwrite default: Uint8 + HSV + Hue Bar") then
        ImGui.GetIO().ConfigColorEditFlags = bit32.bor(CE.Uint8, CE.DisplayHSV, CE.PickerHueBar, CE.InputRGB) -- [port] + InputRGB: upstream omits it and then trips its own InputMask_ assert
    end
    if ImGui.Button("Overwrite default: Float + HDR + Hue Wheel") then
        ImGui.GetIO().ConfigColorEditFlags = bit32.bor(CE.Float, CE.HDR, CE.PickerHueWheel, CE.DisplayRGB, CE.InputRGB)
    end

    ImGui.Text("Both types:")
    local w = (ImGui.GetContentRegionAvail().x - ImGui.GetStyle().ItemSpacing.y) * 0.40
    ImGui.SetNextItemWidth(w)
    ImGui.ColorPicker3("##MyColor##5", color, bit32.bor(CE.PickerHueBar, CE.NoSidePreview, CE.NoInputs, CE.NoAlpha))
    ImGui.SameLine()
    ImGui.SetNextItemWidth(w)
    ImGui.ColorPicker3("##MyColor##6", color, bit32.bor(CE.PickerHueWheel, CE.NoSidePreview, CE.NoInputs, CE.NoAlpha))
    ImGui.PopID()

    ImGui.Spacing()
    ImGui.Text("HSV encoded colors")
    ImGui.SameLine(); HelpMarker("By default, colors are given to ColorEdit and ColorPicker in RGB, but ImGuiColorEditFlags_InputHSV allows you to store colors as HSV and pass them to ColorEdit and ColorPicker as HSV.")
    ImGui.Text("Color widget with InputHSV:")
    ImGui.ColorEdit4("HSV shown as RGB##1", s.hsv, bit32.bor(CE.DisplayRGB, CE.InputHSV, CE.Float))
    ImGui.ColorEdit4("HSV shown as HSV##1", s.hsv, bit32.bor(CE.DisplayHSV, CE.InputHSV, CE.Float))
    ImGui.DragFloat4("Raw HSV values", s.hsv, 0.01, 0.0, 1.0)
    ImGui.TreePop()
end

S.combo = { flags = 0, sel = 0, filter = nil, c2 = 0, c3 = -1, c4 = 0 }
function DemoWindowWidgetsComboBoxes()
    if not ImGui.TreeNode("Combo") then return end
    local s = S.combo
    local CF = ImGuiComboFlags
    local p
    _, s.flags = ImGui.CheckboxFlags("ImGuiComboFlags_PopupAlignLeft", s.flags, CF.PopupAlignLeft)
    ImGui.SameLine(); HelpMarker("Only makes a difference if the popup is larger than the combo")
    p, s.flags = ImGui.CheckboxFlags("ImGuiComboFlags_NoArrowButton", s.flags, CF.NoArrowButton)
    if p then s.flags = bit32.band(s.flags, bit32.bnot(CF.NoPreview)) end
    p, s.flags = ImGui.CheckboxFlags("ImGuiComboFlags_NoPreview", s.flags, CF.NoPreview)
    if p then s.flags = bit32.band(s.flags, bit32.bnot(bit32.bor(CF.NoArrowButton, CF.WidthFitPreview))) end
    p, s.flags = ImGui.CheckboxFlags("ImGuiComboFlags_WidthFitPreview", s.flags, CF.WidthFitPreview)
    if p then s.flags = bit32.band(s.flags, bit32.bnot(CF.NoPreview)) end
    for _, h in ipairs({ "HeightSmall", "HeightRegular", "HeightLargest" }) do
        p, s.flags = ImGui.CheckboxFlags("ImGuiComboFlags_" .. h, s.flags, CF[h])
        if p then s.flags = bit32.band(s.flags, bit32.bnot(bit32.band(CF.HeightMask_, bit32.bnot(CF[h])))) end
    end

    local items = { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIII", "JJJJ", "KKKK", "LLLLLLL", "MMMM", "OOOOOOO" }
    local combo_preview_value = items[s.sel + 1]
    if ImGui.BeginCombo("combo 1", combo_preview_value, s.flags) then
        for n = 0, #items - 1 do
            local is_selected = (s.sel == n)
            if ImGui.Selectable(items[n + 1], is_selected) then s.sel = n end
            if is_selected then ImGui.SetItemDefaultFocus() end
        end
        ImGui.EndCombo()
    end

    if ImGui.BeginCombo("combo 2 (w/ filter)", combo_preview_value, s.flags) then
        s.filter = s.filter or ImGuiTextFilter()
        if ImGui.IsWindowAppearing() then
            ImGui.SetKeyboardFocusHere()
            s.filter:Clear()
        end
        ImGui.SetNextItemShortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.F))
        ImGui.SetNextItemWidth(-FLT_MIN)
        s.filter:DrawWithHint("##Filter", "Filter (incl -excl)")
        for n = 0, #items - 1 do
            local is_selected = (s.sel == n)
            if s.filter:PassFilter(items[n + 1]) then
                if ImGui.Selectable(items[n + 1], is_selected) then s.sel = n end
            end
        end
        ImGui.EndCombo()
    end

    ImGui.Spacing()
    ImGui.SeparatorText("One-liner variants")
    HelpMarker("The Combo() function is not greatly useful apart from cases were you want to embed all options in a single strings.\nFlags above don't apply to this section.")
    s.c2 = ImGui.Combo("combo 3 (one-liner)", s.c2, "aaaa\0bbbb\0cccc\0dddd\0eeee\0\0")
    s.c3 = ImGui.Combo("combo 4 (array)", s.c3, items, #items)
    s.c4 = ImGui.Combo("combo 5 (function)", s.c4, function(data, n) return data[n + 1] end, items, #items)
    ImGui.TreePop()
end

S.dt = { s8 = 127, u8 = 255, s16 = 32767, u16 = 65535, s32 = -1, u32 = 0xFFFFFFFF, s64 = -1, u64 = 0, f32 = 0.123, f64 = 90000.01234567890123456789,
    drag_clamp = false, inputs_step = true, flags = 0 }
function DemoWindowWidgetsDataTypes()
    if not ImGui.TreeNode("Data Types") then return end
    local s = S.dt
    local DT = ImGuiDataType
    -- ponytail: Luau numbers are doubles, so S64/U64 are shown with S32/Double here (no 64-bit integer type)
    local s32_min, s32_max = math.floor(-2147483648 / 2), math.floor(2147483647 / 2)
    local u32_max = math.floor(4294967295 / 2)
    local drag_speed = 0.2
    ImGui.SeparatorText("Drags")
    _, s.drag_clamp = ImGui.Checkbox("Clamp integers to 0..50", s.drag_clamp)
    ImGui.SameLine(); HelpMarker("As with every widget in dear imgui, we never modify values unless there is a user interaction.\nYou can override the clamping limits by using Ctrl+Click to input a value.")
    local lo, hi = s.drag_clamp and 0 or nil, s.drag_clamp and 50 or nil
    s.s8  = ImGui.DragScalar("drag s8",      DT.S8,  s.s8,  drag_speed, lo, hi)
    s.u8  = ImGui.DragScalar("drag u8",      DT.U8,  s.u8,  drag_speed, lo, hi, "%u ms")
    s.s16 = ImGui.DragScalar("drag s16",     DT.S16, s.s16, drag_speed, lo, hi)
    s.u16 = ImGui.DragScalar("drag u16",     DT.U16, s.u16, drag_speed, lo, hi, "%u ms")
    s.s32 = ImGui.DragScalar("drag s32",     DT.S32, s.s32, drag_speed, lo, hi)
    s.s32 = ImGui.DragScalar("drag s32 hex", DT.S32, s.s32, drag_speed, lo, hi, "0x%08X")
    s.u32 = ImGui.DragScalar("drag u32",     DT.U32, s.u32, drag_speed, lo, hi, "%u ms")
    s.f32 = ImGui.DragScalar("drag float",     DT.Float,  s.f32, 0.005, 0.0, 1.0, "%f")
    s.f32 = ImGui.DragScalar("drag float log", DT.Float,  s.f32, 0.005, 0.0, 1.0, "%f", ImGuiSliderFlags.Logarithmic)
    s.f64 = ImGui.DragScalar("drag double",    DT.Double, s.f64, 0.0005, 0.0, nil, "%.10f grams")
    s.f64 = ImGui.DragScalar("drag double log",DT.Double, s.f64, 0.0005, 0.0, 1.0, "0 < %.10f < 1", ImGuiSliderFlags.Logarithmic)

    ImGui.SeparatorText("Sliders")
    s.s8  = ImGui.SliderScalar("slider s8 full",  DT.S8,  s.s8,  -128, 127, "%d")
    s.u8  = ImGui.SliderScalar("slider u8 full",  DT.U8,  s.u8,  0, 255, "%u")
    s.s16 = ImGui.SliderScalar("slider s16 full", DT.S16, s.s16, -32768, 32767, "%d")
    s.u16 = ImGui.SliderScalar("slider u16 full", DT.U16, s.u16, 0, 65535, "%u")
    s.s32 = ImGui.SliderScalar("slider s32 low",  DT.S32, s.s32, 0, 50, "%d")
    s.s32 = ImGui.SliderScalar("slider s32 high", DT.S32, s.s32, s32_max - 100, s32_max, "%d")
    s.s32 = ImGui.SliderScalar("slider s32 full", DT.S32, s.s32, s32_min, s32_max, "%d")
    s.s32 = ImGui.SliderScalar("slider s32 hex",  DT.S32, s.s32, 0, 50, "0x%04X")
    s.u32 = ImGui.SliderScalar("slider u32 low",  DT.U32, s.u32, 0, 50, "%u")
    s.u32 = ImGui.SliderScalar("slider u32 high", DT.U32, s.u32, u32_max - 100, u32_max, "%u")
    s.u32 = ImGui.SliderScalar("slider u32 full", DT.U32, s.u32, 0, u32_max, "%u")
    s.f32 = ImGui.SliderScalar("slider float low",      DT.Float, s.f32, 0.0, 1.0)
    s.f32 = ImGui.SliderScalar("slider float low log",  DT.Float, s.f32, 0.0, 1.0, "%.10f", ImGuiSliderFlags.Logarithmic)
    s.f32 = ImGui.SliderScalar("slider float high",     DT.Float, s.f32, -10000000000.0, 10000000000.0, "%e")
    s.f64 = ImGui.SliderScalar("slider double low",     DT.Double, s.f64, 0.0, 1.0, "%.10f grams")
    s.f64 = ImGui.SliderScalar("slider double low log", DT.Double, s.f64, 0.0, 1.0, "%.10f", ImGuiSliderFlags.Logarithmic)
    s.f64 = ImGui.SliderScalar("slider double high",    DT.Double, s.f64, -1000000000000000.0, 1000000000000000.0, "%e grams")

    ImGui.SeparatorText("Sliders (reverse)")
    s.s8  = ImGui.SliderScalar("slider s8 reverse",  DT.S8,  s.s8,  127, -128, "%d")
    s.u8  = ImGui.SliderScalar("slider u8 reverse",  DT.U8,  s.u8,  255, 0, "%u")
    s.s32 = ImGui.SliderScalar("slider s32 reverse", DT.S32, s.s32, 50, 0, "%d")
    s.u32 = ImGui.SliderScalar("slider u32 reverse", DT.U32, s.u32, 50, 0, "%u")

    ImGui.SeparatorText("Inputs")
    _, s.inputs_step = ImGui.Checkbox("Show step buttons", s.inputs_step)
    _, s.flags = ImGui.CheckboxFlags("ImGuiInputTextFlags_ReadOnly", s.flags, ImGuiInputTextFlags.ReadOnly)
    if ImGuiInputTextFlags.ParseEmptyRefVal then _, s.flags = ImGui.CheckboxFlags("ImGuiInputTextFlags_ParseEmptyRefVal", s.flags, ImGuiInputTextFlags.ParseEmptyRefVal) end
    if ImGuiInputTextFlags.DisplayEmptyRefVal then _, s.flags = ImGui.CheckboxFlags("ImGuiInputTextFlags_DisplayEmptyRefVal", s.flags, ImGuiInputTextFlags.DisplayEmptyRefVal) end
    local one = s.inputs_step and 1 or nil
    s.s8  = ImGui.InputScalar("input s8",      DT.S8,  s.s8,  one, nil, "%d", s.flags)
    s.u8  = ImGui.InputScalar("input u8",      DT.U8,  s.u8,  one, nil, "%u", s.flags)
    s.s16 = ImGui.InputScalar("input s16",     DT.S16, s.s16, one, nil, "%d", s.flags)
    s.u16 = ImGui.InputScalar("input u16",     DT.U16, s.u16, one, nil, "%u", s.flags)
    s.s32 = ImGui.InputScalar("input s32",     DT.S32, s.s32, one, nil, "%d", s.flags)
    s.s32 = ImGui.InputScalar("input s32 hex", DT.S32, s.s32, one, nil, "%04X", s.flags)
    s.u32 = ImGui.InputScalar("input u32",     DT.U32, s.u32, one, nil, "%u", s.flags)
    s.u32 = ImGui.InputScalar("input u32 hex", DT.U32, s.u32, one, nil, "%08X", s.flags)
    s.f32 = ImGui.InputScalar("input float",   DT.Float,  s.f32, s.inputs_step and 1.0 or nil, nil, nil, s.flags)
    s.f64 = ImGui.InputScalar("input double",  DT.Double, s.f64, s.inputs_step and 1.0 or nil, nil, nil, s.flags)
    ImGui.TreePop()
end

function DemoWindowWidgetsDisableBlocks(demo_data)
    if not ImGui.TreeNode("Disable Blocks") then return end
    _, demo_data.DisableSections = ImGui.Checkbox("Disable entire section above", demo_data.DisableSections)
    ImGui.SameLine(); HelpMarker("Demonstrate using BeginDisabled()/EndDisabled() across other sections.")
    ImGui.TreePop()
end

S.dnd = { col1 = { 1.0, 0.0, 0.2 }, col2 = { 0.4, 0.7, 0.0, 0.5 }, mode = 0,
    names = { "Bobby", "Beatrice", "Betty", "Brianna", "Barry", "Bernard", "Bibi", "Blaine", "Bryn" },
    item_names = { "Item One", "Item Two", "Item Three", "Item Four", "Item Five" }, col4 = ImVec4(1.0, 0.0, 0.2, 1.0) }
function DemoWindowWidgetsDragAndDrop()
    if not ImGui.TreeNode("Drag and Drop") then return end
    local s = S.dnd
    if ImGui.TreeNode("Drag and drop in standard widgets") then
        HelpMarker("You can drag from the color squares.")
        ImGui.ColorEdit3("color 1", s.col1)
        ImGui.ColorEdit4("color 2", s.col2)
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Drag and drop to copy/swap items") then
        local Mode_Copy, Mode_Move, Mode_Swap = 0, 1, 2
        if ImGui.RadioButtonEx("Copy", s.mode == Mode_Copy) then s.mode = Mode_Copy end ImGui.SameLine()
        if ImGui.RadioButtonEx("Move", s.mode == Mode_Move) then s.mode = Mode_Move end ImGui.SameLine()
        if ImGui.RadioButtonEx("Swap", s.mode == Mode_Swap) then s.mode = Mode_Swap end
        local names = s.names
        for n = 0, #names - 1 do
            ImGui.PushID(n)
            if n % 3 ~= 0 then ImGui.SameLine() end
            ImGui.Button(names[n + 1], ImVec2(60, 60))
            if ImGui.BeginDragDropSource(ImGuiDragDropFlags.None) then
                ImGui.SetDragDropPayload("DND_DEMO_CELL", n, 4)
                if s.mode == Mode_Copy then ImGui.Text("Copy %s", names[n + 1]) end
                if s.mode == Mode_Move then ImGui.Text("Move %s", names[n + 1]) end
                if s.mode == Mode_Swap then ImGui.Text("Swap %s", names[n + 1]) end
                ImGui.EndDragDropSource()
            end
            if ImGui.BeginDragDropTarget() then
                local payload = ImGui.AcceptDragDropPayload("DND_DEMO_CELL")
                if payload then
                    local payload_n = payload.Data
                    if s.mode == Mode_Copy then names[n + 1] = names[payload_n + 1] end
                    if s.mode == Mode_Move then names[n + 1] = names[payload_n + 1]; names[payload_n + 1] = "" end
                    if s.mode == Mode_Swap then names[n + 1], names[payload_n + 1] = names[payload_n + 1], names[n + 1] end
                end
                ImGui.EndDragDropTarget()
            end
            ImGui.PopID()
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Drag to reorder items (simple)") then
        ImGui.PushItemFlag(ImGuiItemFlags.AllowDuplicateId, true)
        HelpMarker("We don't use the drag and drop api at all here! Instead we query when the item is held but not hovered, and order items accordingly.")
        local item_names = s.item_names
        for n = 1, #item_names do
            local item = item_names[n]
            ImGui.Selectable(item)
            if ImGui.IsItemActive() and not ImGui.IsItemHovered() then
                local n_next = n + ((ImGui.GetMouseDragDelta(0).y < 0.0) and -1 or 1)
                if n_next >= 1 and n_next <= #item_names then
                    item_names[n] = item_names[n_next]
                    item_names[n_next] = item
                    ImGui.ResetMouseDragDelta()
                end
            end
        end
        ImGui.PopItemFlag()
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Tooltip at target location") then
        for n = 0, 1 do
            ImGui.Button((n == 1) and "drop here##1" or "drop here##0")
            if ImGui.BeginDragDropTarget() then
                local drop_target_flags = bit32.bor(ImGuiDragDropFlags.AcceptBeforeDelivery, ImGuiDragDropFlags.AcceptNoPreviewTooltip)
                if ImGui.AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_4F, drop_target_flags) then
                    ImGui.SetMouseCursor(ImGuiMouseCursor.NotAllowed)
                    ImGui.SetTooltip("Cannot drop here!")
                end
                ImGui.EndDragDropTarget()
            end
            if n == 0 then ImGui.ColorButton("drag me", s.col4) end
        end
        ImGui.TreePop()
    end
    ImGui.TreePop()
end

S.ds = { flags = 0, drag_f = 0.5, drag_f4 = { 0, 0, 0, 0 }, drag_i = 50, slider_f = 0.5, slider_f4 = { 0, 0, 0, 0 }, slider_i = 50 }
function DemoWindowWidgetsDragsAndSliders()
    if not ImGui.TreeNode("Drag/Slider Flags") then return end
    local s = S.ds
    local SF = ImGuiSliderFlags
    local function F(name, help)
        if SF[name] == nil then return end
        _, s.flags = ImGui.CheckboxFlags("ImGuiSliderFlags_" .. name, s.flags, SF[name])
        if help then ImGui.SameLine(); HelpMarker(help) end
    end
    F("AlwaysClamp")
    F("ClampOnInput", "Clamp value to min/max bounds when input manually with Ctrl+Click. By default Ctrl+Click allows going out of bounds.")
    F("ClampZeroRange", "Clamp even if min==max==0.0f. Otherwise DragXXX functions don't clamp.")
    F("Logarithmic", "Enable logarithmic editing (more precision for small values).")
    F("NoRoundToFormat", "Disable rounding underlying value to match precision of the format string (e.g. %.3f values are rounded to those 3 digits).")
    F("NoInput", "Disable Ctrl+Click or Enter key allowing to input text directly into the widget.")
    F("NoSpeedTweaks", "Disable keyboard modifiers altering tweak speed. Useful if you want to alter tweak speed yourself based on your own logic.")
    F("WrapAround", "Enable wrapping around from max to min and from min to max (only supported by DragXXX() functions)")
    F("ColorMarkers")
    local flags = s.flags

    ImGui.Text("Underlying float value: %f", s.drag_f)
    s.drag_f = ImGui.DragFloat("DragFloat (0 -> 1)", s.drag_f, 0.005, 0.0, 1.0, "%.3f", flags)
    s.drag_f = ImGui.DragFloat("DragFloat (0 -> +inf)", s.drag_f, 0.005, 0.0, FLT_MAX, "%.3f", flags)
    s.drag_f = ImGui.DragFloat("DragFloat (-inf -> 1)", s.drag_f, 0.005, -FLT_MAX, 1.0, "%.3f", flags)
    s.drag_f = ImGui.DragFloat("DragFloat (-inf -> +inf)", s.drag_f, 0.005, -FLT_MAX, FLT_MAX, "%.3f", flags)
    s.drag_i = ImGui.DragInt("DragInt (0 -> 100)", s.drag_i, 0.5, 0, 100, "%d", flags)
    ImGui.DragFloat4("DragFloat4 (0 -> 1)", s.drag_f4, 0.005, 0.0, 1.0, "%.3f", flags)

    local flags_for_sliders = bit32.band(flags, bit32.bnot(SF.WrapAround))
    ImGui.Text("Underlying float value: %f", s.slider_f)
    s.slider_f = ImGui.SliderFloat("SliderFloat (0 -> 1)", s.slider_f, 0.0, 1.0, "%.3f", flags_for_sliders)
    s.slider_i = ImGui.SliderInt("SliderInt (0 -> 100)", s.slider_i, 0, 100, "%d", flags_for_sliders)
    ImGui.SliderFloat4("SliderFloat4 (0 -> 1)", s.slider_f4, 0.0, 1.0, "%.3f", flags_for_sliders)
    ImGui.TreePop()
end

function DemoWindowWidgetsFonts()
    if not ImGui.TreeNode("Fonts") then return end
    if ImGui.ShowFontAtlas then ImGui.ShowFontAtlas(ImGui.GetIO().Fonts) else DemoNotPorted("ShowFontAtlas") end
    ImGui.TreePop()
end

S.img = { viewer = nil, pressed_count = 0 }
function DemoWindowWidgetsImages()
    if not ImGui.TreeNode("Images") then return end
    local s = S.img
    local io = ImGui.GetIO()
    ImGui.TextWrapped("Below we are displaying the font texture (which is the only texture we have access to in this demo). Use the 'ImTextureID' type as storage to pass pointers or identifier to your own texture data. Hover the texture for a zoomed view!")
    local atlas = io.Fonts
    local my_tex_id = atlas.TexRef
    local my_tex_w = atlas.TexData and atlas.TexData.Width or 0
    local my_tex_h = atlas.TexData and atlas.TexData.Height or 0
    ImGui.Text("%.0fx%.0f", my_tex_w, my_tex_h)

    ImGui.SeparatorText("Image()/ImageWithBg() function")
    ImGui.PushStyleVar(ImGuiStyleVar.ImageBorderSize, math.max(1.0, ImGui.GetStyle().ImageBorderSize))
    ImGui.ImageWithBg(my_tex_id, ImVec2(my_tex_w, my_tex_h), ImVec2(0.0, 0.0), ImVec2(1.0, 1.0), ImVec4(0.0, 0.0, 0.0, 1.0))
    ImGui.PopStyleVar()

    ImGui.SeparatorText("Interactive Image Viewer")
    s.viewer = s.viewer or ExampleImageViewerData()
    local canvas_size = ImVec2(ImGui.GetContentRegionAvail().x, my_tex_h * 2.0)
    ExampleImageViewer_DrawOptions(s.viewer)
    ExampleImageViewer_DrawCanvas(s.viewer, canvas_size, my_tex_id, my_tex_w, my_tex_h)

    ImGui.SeparatorText("Textured Buttons")
    ImGui.TextWrapped("And now some textured buttons..")
    for i = 0, 7 do
        ImGui.PushID(i)
        if i > 0 then ImGui.PushStyleVar(ImGuiStyleVar.FramePadding, ImVec2(i - 1.0, i - 1.0)) end
        local size = ImVec2(32.0, 32.0)
        local uv0 = ImVec2(0.0, 0.0)
        local uv1 = ImVec2(32.0 / my_tex_w, 32.0 / my_tex_h)
        if ImGui.ImageButton("", my_tex_id, size, uv0, uv1, ImVec4(0.0, 0.0, 0.0, 1.0), ImVec4(1.0, 1.0, 1.0, 1.0)) then
            s.pressed_count = s.pressed_count + 1
        end
        if i > 0 then ImGui.PopStyleVar() end
        ImGui.PopID()
        ImGui.SameLine()
    end
    ImGui.NewLine()
    ImGui.Text("Pressed %d times.", s.pressed_count)
    ImGui.TreePop()
end

S.lb = { sel = 0, highlight = false }
function DemoWindowWidgetsListBoxes()
    if not ImGui.TreeNode("List Boxes") then return end
    local s = S.lb
    local items = { "AAAA", "BBBB", "CCCC", "DDDD", "EEEE", "FFFF", "GGGG", "HHHH", "IIII", "JJJJ", "KKKK", "LLLLLLL", "MMMM", "OOOOOOO" }
    local item_highlighted_idx = -1
    _, s.highlight = ImGui.Checkbox("Highlight hovered item in second listbox", s.highlight)
    if ImGui.BeginListBox("listbox 1") then
        for n = 0, #items - 1 do
            local is_selected = (s.sel == n)
            if ImGui.Selectable(items[n + 1], is_selected) then s.sel = n end
            if s.highlight and ImGui.IsItemHovered() then item_highlighted_idx = n end
            if is_selected then ImGui.SetItemDefaultFocus() end
        end
        ImGui.EndListBox()
    end
    ImGui.SameLine(); HelpMarker("Here we are sharing selection state between both boxes.")
    ImGui.Text("Full-width:")
    if ImGui.BeginListBox("##listbox 2", ImVec2(-FLT_MIN, 5 * ImGui.GetTextLineHeightWithSpacing())) then
        for n = 0, #items - 1 do
            local is_selected = (s.sel == n)
            local flags = (item_highlighted_idx == n) and ImGuiSelectableFlags.Highlight or 0
            if ImGui.Selectable(items[n + 1], is_selected, flags) then s.sel = n end
            if is_selected then ImGui.SetItemDefaultFocus() end
        end
        ImGui.EndListBox()
    end
    ImGui.TreePop()
end

S.le = { str = Buf("", 32), i = 0, f = 0.0 }
function DemoWindowWidgetsLiveEdit(demo_data)
    if not ImGui.TreeNode("Live Edit Flags") then return end
    local s = S.le
    ImGui.TextWrapped("Select whether to apply keyboard edits to backing variables _while_ typing.")
    _, demo_data.LiveEditOverride = ImGui.Checkbox("Override Live Edit Flags in Demo Window", demo_data.LiveEditOverride)
    if not demo_data.LiveEditOverride then demo_data.LiveEditFlags = ImGui.GetItemFlags() end
    ImGui.BeginDisabled(demo_data.LiveEditOverride == false)
    ImGui.Indent()
    _, demo_data.LiveEditFlags = ImGui.CheckboxFlags("ImGuiItemFlags_LiveEditOnInputText", demo_data.LiveEditFlags, ImGuiItemFlags.LiveEditOnInputText)
    _, demo_data.LiveEditFlags = ImGui.CheckboxFlags("ImGuiItemFlags_LiveEditOnInputScalar", demo_data.LiveEditFlags, ImGuiItemFlags.LiveEditOnInputScalar)
    ImGui.Unindent()
    ImGui.EndDisabled()
    ImGui.Text("Try typing '123' and seeing effect on backing value:")
    ImGui.InputText("str", s.str, 32)
    ImGui.Text("Backing value: \"%s\"", BufStr(s.str))
    s.i = ImGui.InputInt("int", s.i, 0, 0)
    ImGui.Text("Backing value: %d", s.i)
    s.f = ImGui.SliderFloat("float", s.f, 0.0, 100.0)
    ImGui.Text("Backing value: %f", s.f)
    ImGui.TreePop()
end

S.mv = { use_liveedit = false, items = { 12.0, 0.0, 0.0 } }
function DemoWindowWidgetsMixedValues()
    if not ImGui.TreeNode("Mixed Values") then return end
    local s = S.mv
    local items = s.items
    HelpMarker("Using ImGuiItemFlags_MixedValue.")
    _, s.use_liveedit = ImGui.Checkbox("ImGuiItemFlags_LiveEditOnInput", s.use_liveedit)
    ImGui.SeparatorText("Scalar/Text Widgets")
    local is_mixed = items[1] ~= items[2] or items[1] ~= items[3]
    ImGui.PushItemFlag(ImGuiItemFlags.LiveEditOnInput, s.use_liveedit)
    ImGui.PushItemFlag(ImGuiItemFlags.MixedValue, is_mixed)
    local edited, e = false, false
    items[1], e = ImGui.DragFloat("DragFloat", items[1]); edited = edited or e
    items[1], e = ImGui.SliderFloat("SliderFloat", items[1], 0.0, 100.0); edited = edited or e
    items[1], e = ImGui.InputFloat("InputFloat", items[1], 1.0); edited = edited or e
    if edited then items[2] = items[1]; items[3] = items[1] end
    ImGui.PopItemFlag()
    ImGui.Text("Underlying data:")
    items[1] = ImGui.InputFloat("item 0 (ref)", items[1])
    items[2] = ImGui.InputFloat("item 1", items[2])
    items[3] = ImGui.InputFloat("item 2", items[3])
    ImGui.PopItemFlag()

    ImGui.SeparatorText("Others Widgets")
    ImGui.Text("(note: edits are not applied in this demo)")
    ImGui.Checkbox("Checkbox On", true)
    ImGui.Checkbox("Checkbox Off", false)
    ImGui.PushItemFlag(ImGuiItemFlags.MixedValue, true)
    ImGui.Checkbox("Checkbox Mixed", false)
    ImGui.RadioButtonEx("RadioButton Mixed", true)
    ImGui.SameLine()
    ImGui.RadioButtonEx("RadioButton Mixed##2", true)
    ImGui.Combo("Combo", 0, "One\0Two\0Three\0")
    ImGui.ColorEdit4("ColorEdit4", ImVec4(0.5, 0.5, 0.5, 0.5))
    ImGui.PopItemFlag()
    ImGui.TreePop()
end

S.mc = { vec4f = { 0.10, 0.20, 0.30, 0.44 }, vec4i = { 1, 5, 100, 255 }, flags = 0, b = 10, e = 90, bi = 100, ei = 1000 }
function DemoWindowWidgetsMultiComponents()
    if not ImGui.TreeNode("Multi-component Widgets") then return end
    local s = S.mc
    local f, i = s.vec4f, s.vec4i
    if ImGuiSliderFlags.ColorMarkers then _, s.flags = ImGui.CheckboxFlags("ImGuiSliderFlags_ColorMarkers", s.flags, ImGuiSliderFlags.ColorMarkers) end
    local flags = s.flags
    for _, n in ipairs({ 2, 3, 4 }) do
        ImGui.SeparatorText(n .. "-wide")
        ImGui["InputFloat" .. n]("input float" .. n, f)
        ImGui["InputInt" .. n]("input int" .. n, i)
        ImGui["DragFloat" .. n]("drag float" .. n, f, 0.01, 0.0, 1.0, nil, flags)
        ImGui["DragInt" .. n]("drag int" .. n, i, 1, 0, 255, nil, flags)
        ImGui["SliderFloat" .. n]("slider float" .. n, f, 0.0, 1.0, nil, flags)
        ImGui["SliderInt" .. n]("slider int" .. n, i, 0, 255, nil, flags)
    end
    ImGui.SeparatorText("Ranges")
    s.b, s.e = ImGui.DragFloatRange2("range float", s.b, s.e, 0.25, 0.0, 100.0, "Min: %.1f %%", "Max: %.1f %%", ImGuiSliderFlags.AlwaysClamp)
    s.bi, s.ei = ImGui.DragIntRange2("range int", s.bi, s.ei, 5, 0, 1000, "Min: %d units", "Max: %d units")
    s.bi, s.ei = ImGui.DragIntRange2("range int (no bounds)", s.bi, s.ei, 5, 0, 0, "Min: %d units", "Max: %d units")
    ImGui.TreePop()
end

S.plot = { animate = true, arr = { 0.6, 0.1, 1.0, 0.5, 0.92, 0.1, 0.2 }, values = {}, values_offset = 0, refresh_time = 0.0, phase = 0.0,
    func_type = 0, display_count = 70 }
for n = 1, 90 do S.plot.values[n] = 0.0 end
function DemoWindowWidgetsPlotting()
    if not ImGui.TreeNode("Plotting") then return end
    local s = S.plot
    ImGui.Text("Need better plotting and graphing? Consider using ImPlot:")
    ImGui.TextLinkOpenURL("https://github.com/epezent/implot")
    ImGui.Separator()
    _, s.animate = ImGui.Checkbox("Animate", s.animate)
    ImGui.PlotLines("Frame Times", s.arr, nil, #s.arr)
    ImGui.PlotHistogram("Histogram", s.arr, nil, #s.arr, 0, nil, 0.0, 1.0, ImVec2(0, 80.0))

    local values = s.values
    if not s.animate or s.refresh_time == 0.0 then s.refresh_time = ImGui.GetTime() end
    while s.refresh_time < ImGui.GetTime() do
        values[s.values_offset + 1] = math.cos(s.phase)
        s.values_offset = (s.values_offset + 1) % #values
        s.phase = s.phase + 0.10 * s.values_offset
        s.refresh_time = s.refresh_time + 1.0 / 60.0
    end
    local average = 0.0
    for n = 1, #values do average = average + values[n] end
    average = average / #values
    ImGui.PlotLines("Lines", values, nil, #values, s.values_offset, string.format("avg %f", average), -1.0, 1.0, ImVec2(0, 80.0))

    -- Getters receive a 1-based index in this port
    local function Sin(_, i) return math.sin((i - 1) * 0.1) end
    local function Saw(_, i) return ((i - 1) % 2 == 1) and 1.0 or -1.0 end
    ImGui.SeparatorText("Functions")
    ImGui.SetNextItemWidth(ImGui.GetFontSize() * 8)
    s.func_type = ImGui.Combo("func", s.func_type, "Sin\0Saw\0")
    ImGui.SameLine()
    s.display_count = ImGui.SliderInt("Sample count", s.display_count, 1, 400)
    local func = (s.func_type == 0) and Sin or Saw
    ImGui.PlotLines("Lines##2", func, nil, s.display_count, 0, nil, -1.0, 1.0, ImVec2(0, 80))
    ImGui.PlotHistogram("Histogram##2", func, nil, s.display_count, 0, nil, -1.0, 1.0, ImVec2(0, 80))
    ImGui.TreePop()
end

S.pb = { accum = 0.0, dir = 1.0 }
function DemoWindowWidgetsProgressBars()
    if not ImGui.TreeNode("Progress Bars") then return end
    local s = S.pb
    s.accum = s.accum + s.dir * 0.4 * ImGui.GetIO().DeltaTime
    if s.accum >= 1.1 then s.accum = 1.1; s.dir = -s.dir end
    if s.accum <= -0.1 then s.accum = -0.1; s.dir = -s.dir end
    local progress = DemoClamp(s.accum, 0.0, 1.0)
    ImGui.ProgressBar(progress, ImVec2(0.0, 0.0))
    ImGui.SameLine(0.0, ImGui.GetStyle().ItemInnerSpacing.x)
    ImGui.Text("Progress Bar")
    ImGui.ProgressBar(progress, ImVec2(0.0, 0.0), string.format("%d/%d", math.floor(progress * 1753), 1753))
    ImGui.ProgressBar(-1.0 * ImGui.GetTime(), ImVec2(0.0, 0.0), "Searching..")
    ImGui.SameLine(0.0, ImGui.GetStyle().ItemInnerSpacing.x)
    ImGui.Text("Indeterminate")
    ImGui.TreePop()
end

-- Selectable(label, bool* p_selected) overload: toggles on press
local function SelectableP(label, sel, flags, size)
    local pressed = ImGui.Selectable(label, sel, flags, size)
    if pressed then sel = not sel end
    return pressed, sel
end

local function B(v) return v and 1 or 0 end

S.qs = { item_type = 4, item_disabled = false, item_mixedvalue = false, liveedit_override = false, liveedit_flags = 0,
    b = false, col4f = { 1.0, 0.5, 0.0, 1.0 }, str = Buf("", 16), combo = 1, listbox = 1, unused = Buf("", 1),
    embed = false, test_window = false }
function DemoWindowWidgetsQueryingStatuses()
    local s = S.qs
    if ImGui.TreeNode("Querying Item Status (Edited/Active/Hovered etc.)") then
        local item_names = { "Text", "Button", "Button (w/ repeat)", "Checkbox", "SliderFloat", "InputText", "InputTextMultiline", "InputFloat",
            "InputFloat3", "ColorEdit4", "Selectable", "MenuItem", "TreeNode", "TreeNode (w/ double-click)", "Combo", "ListBox" }
        s.item_type = ImGui.Combo("Item Type", s.item_type, item_names, #item_names, #item_names)
        ImGui.SameLine()
        HelpMarker("Testing how various types of items are interacting with the IsItemXXX functions. Note that the bool return value of most ImGui function is generally equivalent to calling ImGui::IsItemHovered().")
        _, s.item_disabled = ImGui.Checkbox("Item Disabled", s.item_disabled)
        _, s.item_mixedvalue = ImGui.Checkbox("Item MixedValue", s.item_mixedvalue)
        _, s.liveedit_override = ImGui.Checkbox("Override LiveEdit:", s.liveedit_override)
        ImGui.SameLine()
        if not s.liveedit_override then s.liveedit_flags = ImGui.GetItemFlags() end
        ImGui.BeginDisabled(s.liveedit_override == false)
        _, s.liveedit_flags = ImGui.CheckboxFlags("_LiveEditOnInput", s.liveedit_flags, ImGuiItemFlags.LiveEditOnInput)
        ImGui.SameLine()
        _, s.liveedit_flags = ImGui.CheckboxFlags("_LiveEditOnInputText", s.liveedit_flags, ImGuiItemFlags.LiveEditOnInputText)
        ImGui.SameLine()
        _, s.liveedit_flags = ImGui.CheckboxFlags("_LiveEditOnInputScalar", s.liveedit_flags, ImGuiItemFlags.LiveEditOnInputScalar)
        ImGui.EndDisabled()
        if s.liveedit_override then
            ImGui.PushItemFlag(ImGuiItemFlags.LiveEditOnInputText, bit32.band(s.liveedit_flags, ImGuiItemFlags.LiveEditOnInputText) ~= 0)
            ImGui.PushItemFlag(ImGuiItemFlags.LiveEditOnInputScalar, bit32.band(s.liveedit_flags, ImGuiItemFlags.LiveEditOnInputScalar) ~= 0)
        end

        local ret = false
        local t = s.item_type
        if s.item_disabled then ImGui.BeginDisabled(true) end
        if s.item_mixedvalue then ImGui.PushItemFlag(ImGuiItemFlags.MixedValue, true) end
        if t == 0 then ImGui.Text("ITEM: Text") end
        if t == 1 then ret = ImGui.Button("ITEM: Button") end
        if t == 2 then ImGui.PushItemFlag(ImGuiItemFlags.ButtonRepeat, true); ret = ImGui.Button("ITEM: Button"); ImGui.PopItemFlag() end
        if t == 3 then ret, s.b = ImGui.Checkbox("ITEM: Checkbox", s.b) end
        if t == 4 then s.col4f[1], ret = ImGui.SliderFloat("ITEM: SliderFloat", s.col4f[1], 0.0, 1.0) end
        if t == 5 then ret = ImGui.InputText("ITEM: InputText", s.str, 16) end
        if t == 6 then ret = ImGui.InputTextMultiline("ITEM: InputTextMultiline", s.str, 16) end
        if t == 7 then s.col4f[1], ret = ImGui.InputFloat("ITEM: InputFloat", s.col4f[1], 1.0) end
        if t == 8 then ret = ImGui.InputFloat3("ITEM: InputFloat3", s.col4f) end
        if t == 9 then ret = ImGui.ColorEdit4("ITEM: ColorEdit4", s.col4f) end
        if t == 10 then ret = ImGui.Selectable("ITEM: Selectable") end
        if t == 11 then ret = ImGui.MenuItem("ITEM: MenuItem") end
        if t == 12 then ret = ImGui.TreeNode("ITEM: TreeNode"); if ret then ImGui.TreePop() end end
        if t == 13 then ret = ImGui.TreeNodeEx("ITEM: TreeNode w/ ImGuiTreeNodeFlags_OpenOnDoubleClick", bit32.bor(ImGuiTreeNodeFlags.OpenOnDoubleClick, ImGuiTreeNodeFlags.NoTreePushOnOpen)) end
        if t == 14 then s.combo, ret = ImGui.Combo("ITEM: Combo", s.combo, { "Apple", "Banana", "Cherry", "Kiwi" }) end
        if t == 15 then s.listbox, ret = ImGui.ListBox("ITEM: ListBox", s.listbox, { "Apple", "Banana", "Cherry", "Kiwi" }, 4, 4) end

        local HF = ImGuiHoveredFlags
        local hovered_delay_none = ImGui.IsItemHovered()
        local hovered_delay_stationary = ImGui.IsItemHovered(HF.Stationary)
        local hovered_delay_short = ImGui.IsItemHovered(HF.DelayShort)
        local hovered_delay_normal = ImGui.IsItemHovered(HF.DelayNormal)
        local hovered_delay_tooltip = ImGui.IsItemHovered(HF.ForTooltip)
        local rmin, rmax, rsize = ImGui.GetItemRectMin(), ImGui.GetItemRectMax(), ImGui.GetItemRectSize()
        ImGui.BulletText(
            "Return value = %d\nIsItemFocused() = %d\nIsItemHovered() = %d\nIsItemHovered(_AllowWhenBlockedByPopup) = %d\n" ..
            "IsItemHovered(_AllowWhenBlockedByActiveItem) = %d\nIsItemHovered(_AllowWhenOverlappedByItem) = %d\n" ..
            "IsItemHovered(_AllowWhenOverlappedByWindow) = %d\nIsItemHovered(_AllowWhenDisabled) = %d\nIsItemHovered(_RectOnly) = %d\n" ..
            "IsItemActive() = %d\nIsItemEdited() = %d\nIsItemActivated() = %d\nIsItemDeactivated() = %d\nIsItemDeactivatedAfterEdit() = %d\n" ..
            "IsItemVisible() = %d\nIsItemClicked() = %d\nIsItemToggledOpen() = %d\n" ..
            "GetItemRectMin() = (%.1f, %.1f)\nGetItemRectMax() = (%.1f, %.1f)\nGetItemRectSize() = (%.1f, %.1f)",
            B(ret), B(ImGui.IsItemFocused()), B(ImGui.IsItemHovered()), B(ImGui.IsItemHovered(HF.AllowWhenBlockedByPopup)),
            B(ImGui.IsItemHovered(HF.AllowWhenBlockedByActiveItem)), B(ImGui.IsItemHovered(HF.AllowWhenOverlappedByItem)),
            B(ImGui.IsItemHovered(HF.AllowWhenOverlappedByWindow)), B(ImGui.IsItemHovered(HF.AllowWhenDisabled)), B(ImGui.IsItemHovered(HF.RectOnly)),
            B(ImGui.IsItemActive()), B(ImGui.IsItemEdited()), B(ImGui.IsItemActivated()), B(ImGui.IsItemDeactivated()), B(ImGui.IsItemDeactivatedAfterEdit()),
            B(ImGui.IsItemVisible()), B(ImGui.IsItemClicked()), B(ImGui.IsItemToggledOpen()),
            rmin.x, rmin.y, rmax.x, rmax.y, rsize.x, rsize.y)
        ImGui.BulletText(
            "with Hovering Delay or Stationary test:\nIsItemHovered() = %d\nIsItemHovered(_Stationary) = %d\nIsItemHovered(_DelayShort) = %d\nIsItemHovered(_DelayNormal) = %d\nIsItemHovered(_Tooltip) = %d",
            B(hovered_delay_none), B(hovered_delay_stationary), B(hovered_delay_short), B(hovered_delay_normal), B(hovered_delay_tooltip))

        if s.liveedit_override then ImGui.PopItemFlag(); ImGui.PopItemFlag() end
        if s.item_mixedvalue then ImGui.PopItemFlag() end
        if s.item_disabled then ImGui.EndDisabled() end

        ImGui.InputText("unused", s.unused, 1, ImGuiInputTextFlags.ReadOnly)
        ImGui.SameLine()
        HelpMarker("This widget is only here to be able to tab-out of the widgets above and see e.g. Deactivated() status.")
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Querying Window Status (Focused/Hovered etc.)") then
        _, s.embed = ImGui.Checkbox("Embed everything inside a child window for testing _RootWindow flag.", s.embed)
        if s.embed then ImGui.BeginChild("outer_child", ImVec2(0, ImGui.GetFontSize() * 20.0), ImGuiChildFlags.Borders) end
        local FF, HF = ImGuiFocusedFlags, ImGuiHoveredFlags
        local bor = bit32.bor
        ImGui.BulletText(
            "IsWindowFocused() = %d\nIsWindowFocused(_ChildWindows) = %d\nIsWindowFocused(_ChildWindows|_NoPopupHierarchy) = %d\n" ..
            "IsWindowFocused(_ChildWindows|_DockHierarchy) = %d\nIsWindowFocused(_ChildWindows|_RootWindow) = %d\n" ..
            "IsWindowFocused(_ChildWindows|_RootWindow|_NoPopupHierarchy) = %d\nIsWindowFocused(_ChildWindows|_RootWindow|_DockHierarchy) = %d\n" ..
            "IsWindowFocused(_RootWindow) = %d\nIsWindowFocused(_RootWindow|_NoPopupHierarchy) = %d\nIsWindowFocused(_RootWindow|_DockHierarchy) = %d\n" ..
            "IsWindowFocused(_AnyWindow) = %d\n",
            B(ImGui.IsWindowFocused()), B(ImGui.IsWindowFocused(FF.ChildWindows)), B(ImGui.IsWindowFocused(bor(FF.ChildWindows, FF.NoPopupHierarchy))),
            B(ImGui.IsWindowFocused(bor(FF.ChildWindows, FF.DockHierarchy))), B(ImGui.IsWindowFocused(bor(FF.ChildWindows, FF.RootWindow))),
            B(ImGui.IsWindowFocused(bor(FF.ChildWindows, FF.RootWindow, FF.NoPopupHierarchy))), B(ImGui.IsWindowFocused(bor(FF.ChildWindows, FF.RootWindow, FF.DockHierarchy))),
            B(ImGui.IsWindowFocused(FF.RootWindow)), B(ImGui.IsWindowFocused(bor(FF.RootWindow, FF.NoPopupHierarchy))), B(ImGui.IsWindowFocused(bor(FF.RootWindow, FF.DockHierarchy))),
            B(ImGui.IsWindowFocused(FF.AnyWindow)))
        ImGui.BulletText(
            "IsWindowHovered() = %d\nIsWindowHovered(_AllowWhenBlockedByPopup) = %d\nIsWindowHovered(_AllowWhenBlockedByActiveItem) = %d\n" ..
            "IsWindowHovered(_ChildWindows) = %d\nIsWindowHovered(_ChildWindows|_NoPopupHierarchy) = %d\nIsWindowHovered(_ChildWindows|_DockHierarchy) = %d\n" ..
            "IsWindowHovered(_ChildWindows|_RootWindow) = %d\nIsWindowHovered(_ChildWindows|_RootWindow|_NoPopupHierarchy) = %d\n" ..
            "IsWindowHovered(_ChildWindows|_RootWindow|_DockHierarchy) = %d\nIsWindowHovered(_RootWindow) = %d\nIsWindowHovered(_RootWindow|_NoPopupHierarchy) = %d\n" ..
            "IsWindowHovered(_RootWindow|_DockHierarchy) = %d\nIsWindowHovered(_ChildWindows|_AllowWhenBlockedByPopup) = %d\nIsWindowHovered(_AnyWindow) = %d\n" ..
            "IsWindowHovered(_Stationary) = %d\n",
            B(ImGui.IsWindowHovered()), B(ImGui.IsWindowHovered(HF.AllowWhenBlockedByPopup)), B(ImGui.IsWindowHovered(HF.AllowWhenBlockedByActiveItem)),
            B(ImGui.IsWindowHovered(HF.ChildWindows)), B(ImGui.IsWindowHovered(bor(HF.ChildWindows, HF.NoPopupHierarchy))), B(ImGui.IsWindowHovered(bor(HF.ChildWindows, HF.DockHierarchy))),
            B(ImGui.IsWindowHovered(bor(HF.ChildWindows, HF.RootWindow))), B(ImGui.IsWindowHovered(bor(HF.ChildWindows, HF.RootWindow, HF.NoPopupHierarchy))),
            B(ImGui.IsWindowHovered(bor(HF.ChildWindows, HF.RootWindow, HF.DockHierarchy))), B(ImGui.IsWindowHovered(HF.RootWindow)), B(ImGui.IsWindowHovered(bor(HF.RootWindow, HF.NoPopupHierarchy))),
            B(ImGui.IsWindowHovered(bor(HF.RootWindow, HF.DockHierarchy))), B(ImGui.IsWindowHovered(bor(HF.ChildWindows, HF.AllowWhenBlockedByPopup))), B(ImGui.IsWindowHovered(HF.AnyWindow)),
            B(ImGui.IsWindowHovered(HF.Stationary)))
        ImGui.BeginChild("child", ImVec2(0, 50), ImGuiChildFlags.Borders)
        ImGui.Text("This is another child window for testing the _ChildWindows flag.")
        ImGui.EndChild()
        if s.embed then ImGui.EndChild() end

        _, s.test_window = ImGui.Checkbox("Hovered/Active tests after Begin() for title bar testing", s.test_window)
        if s.test_window then
            s.test_window = ImGui.Begin("Title bar Hovered/Active tests", s.test_window)
            if ImGui.BeginPopupContextItem() then
                if ImGui.MenuItem("Close") then s.test_window = false end
                ImGui.EndPopup()
            end
            ImGui.Text("IsItemHovered() after begin = %d (== is title bar hovered)\nIsItemActive() after begin = %d (== is window being clicked/moved)\n",
                B(ImGui.IsItemHovered()), B(ImGui.IsItemActive()))
            ImGui.End()
        end
        ImGui.TreePop()
    end
end

S.sel = { basic = { false, true, false, false }, multi = { false, false, false }, checked = { false, false, false, false, false }, selected_n = 0,
    tables = {}, grid = { { 1, 0, 0, 0 }, { 0, 1, 0, 0 }, { 0, 0, 1, 0 }, { 0, 0, 0, 1 } },
    align = { true, false, true, false, true, false, true, false, true } }
for i = 1, 10 do S.sel.tables[i] = false end
function DemoWindowWidgetsSelectables()
    if not ImGui.TreeNode("Selectables") then return end
    local s = S.sel
    if ImGui.TreeNode("Basic") then
        local b = s.basic
        _, b[1] = SelectableP("1. I am selectable", b[1])
        _, b[2] = SelectableP("2. I am selectable", b[2])
        _, b[3] = SelectableP("3. I am selectable", b[3])
        if ImGui.Selectable("4. I am double clickable", b[4], ImGuiSelectableFlags.AllowDoubleClick) then
            if ImGui.IsMouseDoubleClicked(0) then b[4] = not b[4] end
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Multiple items on the same line") then
        local m = s.multi
        ImGui.SetNextItemAllowOverlap(); _, m[1] = SelectableP("main.c", m[1]); ImGui.SameLine(); ImGui.SmallButton("Link 1")
        ImGui.SetNextItemAllowOverlap(); _, m[2] = SelectableP("hello.cpp", m[2]); ImGui.SameLine(); ImGui.SmallButton("Link 2")
        ImGui.SetNextItemAllowOverlap(); _, m[3] = SelectableP("hello.h", m[3]); ImGui.SameLine(); ImGui.SmallButton("Link 3")
        ImGui.Spacing()
        local color_marker_w = ImGui.CalcTextSize("x").x
        for n = 0, 4 do
            ImGui.PushID(n)
            ImGui.AlignTextToFramePadding()
            if ImGui.Selectable("##selectable", s.selected_n == n, ImGuiSelectableFlags.AllowOverlap) then s.selected_n = n end
            ImGui.SameLine(0, 0)
            _, s.checked[n + 1] = ImGui.Checkbox("##check", s.checked[n + 1])
            ImGui.SameLine()
            local color = ImVec4((n % 2 == 1) and 1.0 or 0.2, (math.floor(n / 2) % 2 == 1) and 1.0 or 0.2, 0.2, 1.0)
            ImGui.ColorButton("##color", color, ImGuiColorEditFlags.NoTooltip, ImVec2(color_marker_w, 0))
            ImGui.SameLine()
            ImGui.Text("Some label")
            ImGui.PopID()
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("In Tables") then
        local sel = s.tables
        local TF = ImGuiTableFlags
        if ImGui.BeginTable("split1", 3, bit32.bor(TF.Resizable, TF.NoSavedSettings, TF.Borders)) then
            for i = 0, 9 do
                ImGui.TableNextColumn()
                _, sel[i + 1] = SelectableP(string.format("Item %d", i), sel[i + 1])
            end
            ImGui.EndTable()
        end
        ImGui.Spacing()
        if ImGui.BeginTable("split2", 3, bit32.bor(TF.Resizable, TF.NoSavedSettings, TF.Borders)) then
            for i = 0, 9 do
                ImGui.TableNextRow()
                ImGui.TableNextColumn()
                _, sel[i + 1] = SelectableP(string.format("Item %d", i), sel[i + 1], ImGuiSelectableFlags.SpanAllColumns)
                ImGui.TableNextColumn()
                ImGui.Text("Some other contents")
                ImGui.TableNextColumn()
                ImGui.Text("123456")
            end
            ImGui.EndTable()
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Grid") then
        local g = s.grid
        local time = ImGui.GetTime()
        local winning_state = true
        for y = 1, 4 do for x = 1, 4 do if g[y][x] == 0 then winning_state = false end end end
        if winning_state then
            ImGui.PushStyleVar(ImGuiStyleVar.SelectableTextAlign, ImVec2(0.5 + 0.5 * math.cos(time * 2.0), 0.5 + 0.5 * math.sin(time * 3.0)))
        end
        local size = ImGui.CalcTextSize("Sailor").x
        for y = 1, 4 do
            for x = 1, 4 do
                if x > 1 then ImGui.SameLine() end
                ImGui.PushID((y - 1) * 4 + (x - 1))
                if ImGui.Selectable("Sailor", g[y][x] ~= 0, 0, ImVec2(size, size)) then
                    g[y][x] = 1 - g[y][x]
                    if x > 1 then g[y][x - 1] = 1 - g[y][x - 1] end
                    if x < 4 then g[y][x + 1] = 1 - g[y][x + 1] end
                    if y > 1 then g[y - 1][x] = 1 - g[y - 1][x] end
                    if y < 4 then g[y + 1][x] = 1 - g[y + 1][x] end
                end
                ImGui.PopID()
            end
        end
        if winning_state then ImGui.PopStyleVar() end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Alignment") then
        HelpMarker("By default, Selectables uses style.SelectableTextAlign but it can be overridden on a per-item basis using PushStyleVar(). You'll probably want to always keep your default situation to left-align otherwise it becomes difficult to layout multiple items on a same line")
        local size = ImGui.CalcTextSize("(1.0,1.0)").x
        for y = 0, 2 do
            for x = 0, 2 do
                local alignment = ImVec2(x / 2.0, y / 2.0)
                local name = string.format("(%.1f,%.1f)", alignment.x, alignment.y)
                if x > 0 then ImGui.SameLine() end
                ImGui.PushStyleVar(ImGuiStyleVar.SelectableTextAlign, alignment)
                _, s.align[3 * y + x + 1] = SelectableP(name, s.align[3 * y + x + 1], ImGuiSelectableFlags.None, ImVec2(size, size))
                ImGui.PopStyleVar()
            end
        end
        ImGui.TreePop()
    end
    ImGui.TreePop()
end

local function EditTabBarFittingPolicyFlags(flags)
    local TB = ImGuiTabBarFlags
    if bit32.band(flags, TB.FittingPolicyMask_) == 0 then flags = bit32.bor(flags, TB.FittingPolicyDefault_) end
    for _, n in ipairs({ "FittingPolicyMixed", "FittingPolicyShrink", "FittingPolicyScroll" }) do
        local p
        p, flags = ImGui.CheckboxFlags("ImGuiTabBarFlags_" .. n, flags, TB[n])
        if p then flags = bit32.band(flags, bit32.bnot(bit32.bxor(TB.FittingPolicyMask_, TB[n]))) end
    end
    return flags
end

S.tabs = { adv_flags = ImGuiTabBarFlags.Reorderable, opened = { true, true, true, true }, active_tabs = {}, next_tab_id = 0,
    show_leading = true, show_trailing = true, show_lt_tabs = false,
    tib_flags = bit32.bor(ImGuiTabBarFlags.AutoSelectNewTabs, ImGuiTabBarFlags.Reorderable, ImGuiTabBarFlags.FittingPolicyMixed) }
function DemoWindowWidgetsTabs()
    if not ImGui.TreeNode("Tabs") then return end
    local s = S.tabs
    local TB, TI = ImGuiTabBarFlags, ImGuiTabItemFlags
    if ImGui.TreeNode("Basic") then
        if ImGui.BeginTabBar("MyTabBar", TB.None) then
            if ImGui.BeginTabItem("Avocado") then ImGui.Text("This is the Avocado tab!\nblah blah blah blah blah"); ImGui.EndTabItem() end
            if ImGui.BeginTabItem("Broccoli") then ImGui.Text("This is the Broccoli tab!\nblah blah blah blah blah"); ImGui.EndTabItem() end
            if ImGui.BeginTabItem("Cucumber") then ImGui.Text("This is the Cucumber tab!\nblah blah blah blah blah"); ImGui.EndTabItem() end
            ImGui.EndTabBar()
        end
        ImGui.Separator()
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Advanced & Close Button") then
        for _, n in ipairs({ "Reorderable", "AutoSelectNewTabs", "TabListPopupButton", "NoCloseWithMiddleMouseButton", "DrawSelectedOverline" }) do
            _, s.adv_flags = ImGui.CheckboxFlags("ImGuiTabBarFlags_" .. n, s.adv_flags, TB[n])
        end
        s.adv_flags = EditTabBarFittingPolicyFlags(s.adv_flags)
        ImGui.AlignTextToFramePadding()
        ImGui.Text("Opened:")
        local names = { "Artichoke", "Beetroot", "Celery", "Daikon" }
        for n = 1, 4 do
            ImGui.SameLine()
            _, s.opened[n] = ImGui.Checkbox(names[n], s.opened[n])
        end
        if ImGui.BeginTabBar("MyTabBar", s.adv_flags) then
            for n = 1, 4 do
                if s.opened[n] then
                    local visible
                    visible, s.opened[n] = ImGui.BeginTabItem(names[n], s.opened[n], TI.None)
                    if visible then
                        ImGui.Text("This is the %s tab!", names[n])
                        if (n - 1) % 2 == 1 then ImGui.Text("I am an odd tab.") end
                        ImGui.EndTabItem()
                    end
                end
            end
            ImGui.EndTabBar()
        end
        ImGui.Separator()
        ImGui.TreePop()
    end

    if ImGui.TreeNode("TabItemButton & Leading/Trailing flags") then
        if s.next_tab_id == 0 then
            for _ = 1, 3 do s.active_tabs[#s.active_tabs + 1] = s.next_tab_id; s.next_tab_id = s.next_tab_id + 1 end
        end
        _, s.show_leading = ImGui.Checkbox("Show Leading TabItemButton()", s.show_leading)
        _, s.show_trailing = ImGui.Checkbox("Show Trailing TabItemButton()", s.show_trailing)
        _, s.show_lt_tabs = ImGui.Checkbox("Show Leading+Trailing TabItem()", s.show_lt_tabs)
        s.tib_flags = EditTabBarFittingPolicyFlags(s.tib_flags)
        if ImGui.BeginTabBar("MyTabBar", s.tib_flags) then
            if s.show_leading then
                if ImGui.TabItemButton("?", bit32.bor(TI.Leading, TI.NoTooltip)) then ImGui.OpenPopup("MyHelpMenu") end
            end
            if ImGui.BeginPopup("MyHelpMenu") then
                ImGui.Selectable("Hello!")
                ImGui.EndPopup()
            end
            if s.show_lt_tabs then
                if ImGui.BeginTabItem("Leading", nil, TI.Leading) then ImGui.EndTabItem() end
                if ImGui.BeginTabItem("Trailing", nil, TI.Trailing) then ImGui.EndTabItem() end
            end
            if s.show_trailing then
                if ImGui.TabItemButton("+", bit32.bor(TI.Trailing, TI.NoTooltip)) then
                    s.active_tabs[#s.active_tabs + 1] = s.next_tab_id; s.next_tab_id = s.next_tab_id + 1
                end
            end
            local n = 1
            while n <= #s.active_tabs do
                local name = string.format("%04d", s.active_tabs[n])
                local visible, open = ImGui.BeginTabItem(name, true, TI.None)
                if visible then
                    ImGui.Text("This is the %s tab!", name)
                    ImGui.EndTabItem()
                end
                if open == false then table.remove(s.active_tabs, n) else n = n + 1 end
            end
            ImGui.EndTabBar()
        end
        ImGui.Separator()
        ImGui.TreePop()
    end
    ImGui.TreePop()
end

S.text = { custom_size = 16.0, custom_scale = 1.0, wrap_width = 200.0, utf8 = Buf("\xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e", 32) }
function DemoWindowWidgetsText()
    if not ImGui.TreeNode("Text") then return end
    local s = S.text
    if ImGui.TreeNode("Colorful Text") then
        ImGui.TextColored(ImVec4(1.0, 0.0, 1.0, 1.0), "Pink")
        ImGui.TextColored(ImVec4(1.0, 1.0, 0.0, 1.0), "Yellow")
        ImGui.TextDisabled("Disabled")
        ImGui.SameLine(); HelpMarker("The TextDisabled color is stored in ImGuiStyle.")
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Font Size") then
        local style = ImGui.GetStyle()
        local global_scale = style.FontScaleMain * style.FontScaleDpi
        ImGui.Text("style.FontScaleMain = %0.2f", style.FontScaleMain)
        ImGui.Text("style.FontScaleDpi = %0.2f", style.FontScaleDpi)
        ImGui.Text("global_scale = ~%0.2f", global_scale)
        ImGui.Text("FontSize = %0.2f", ImGui.GetFontSize())
        ImGui.SeparatorText("")
        s.custom_size = ImGui.SliderFloat("custom_size", s.custom_size, 10.0, 100.0, "%.0f")
        ImGui.Text("ImGui::PushFont(nullptr, custom_size);")
        ImGui.PushFont(nil, s.custom_size)
        ImGui.Text("FontSize = %.2f (== %.2f * global_scale)", ImGui.GetFontSize(), s.custom_size)
        ImGui.PopFont()
        ImGui.SeparatorText("")
        s.custom_scale = ImGui.SliderFloat("custom_scale", s.custom_scale, 0.5, 4.0, "%.2f")
        ImGui.Text("ImGui::PushFont(nullptr, style.FontSizeBase * custom_scale);")
        ImGui.PushFont(nil, style.FontSizeBase * s.custom_scale)
        ImGui.Text("FontSize = %.2f (== style.FontSizeBase * %.2f * global_scale)", ImGui.GetFontSize(), s.custom_scale)
        ImGui.PopFont()
        ImGui.SeparatorText("")
        local scaling = 0.5
        while scaling <= 4.0 do
            ImGui.PushFont(nil, style.FontSizeBase * scaling)
            ImGui.Text("FontSize = %.2f (== style.FontSizeBase * %.2f * global_scale)", ImGui.GetFontSize(), scaling)
            ImGui.PopFont()
            scaling = scaling + 0.5
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Word Wrapping") then
        ImGui.TextWrapped("This text should automatically wrap on the edge of the window. The current implementation for text wrapping follows simple rules suitable for English and possibly other languages.")
        ImGui.Spacing()
        s.wrap_width = ImGui.SliderFloat("Wrap width", s.wrap_width, -20, 600, "%.0f")
        local draw_list = ImGui.GetWindowDrawList()
        for n = 0, 1 do
            ImGui.Text("Test paragraph %d:", n)
            local pos = ImGui.GetCursorScreenPos()
            local marker_min = ImVec2(pos.x + s.wrap_width, pos.y)
            local marker_max = ImVec2(pos.x + s.wrap_width + 10, pos.y + ImGui.GetTextLineHeight())
            ImGui.PushTextWrapPos(ImGui.GetCursorPos().x + s.wrap_width)
            if n == 0 then
                ImGui.Text("The lazy dog is a good dog. This paragraph should fit within %.0f pixels. Testing a 1 character word. The quick brown fox jumps over the lazy dog.", s.wrap_width)
            else
                ImGui.Text("aaaaaaaa bbbbbbbb, c cccccccc,dddddddd. d eeeeeeee   ffffffff. gggggggg!hhhhhhhh")
            end
            draw_list:AddRect(ImGui.GetItemRectMin(), ImGui.GetItemRectMax(), IM_COL32(255, 255, 0, 255))
            draw_list:AddRectFilled(marker_min, marker_max, IM_COL32(255, 0, 255, 255))
            ImGui.PopTextWrapPos()
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("UTF-8 Text") then
        ImGui.TextWrapped("CJK text will only appear if the font was loaded with the appropriate CJK character ranges. Call io.Fonts->AddFontFromFileTTF() manually to load extra character ranges. Read docs/FONTS.md for details.")
        ImGui.Text("Hiragana: \xe3\x81\x8b\xe3\x81\x8d\xe3\x81\x8f\xe3\x81\x91\xe3\x81\x93 (kakikukeko)")
        ImGui.Text("Kanjis: \xe6\x97\xa5\xe6\x9c\xac\xe8\xaa\x9e (nihongo)")
        ImGui.InputText("UTF-8 input", s.utf8, 32)
        ImGui.TreePop()
    end
    ImGui.TreePop()
end

S.tf = { filter = nil }
function DemoWindowWidgetsTextFilter()
    if not ImGui.TreeNode("Text Filter") then return end
    S.tf.filter = S.tf.filter or ImGuiTextFilter()
    local filter = S.tf.filter
    HelpMarker("Not a widget per-se, but ImGuiTextFilter is a helper to perform simple filtering on text strings.")
    ImGui.Text("Filter usage:\n  \"\"         display all lines\n  xxx        display lines containing \"xxx\"\n  xxx yyy    display lines containing \"xxx\" and \"yyy\"\n  \"xxx yyy\"  display lines containing \"xxx yyy\"\n  xxx,yyy    display lines containing \"xxx\" or \"yyy\"\n  -xxx       hide lines containing \"xxx\"")
    ImGui.SetNextItemWidth(-FLT_MIN)
    filter:DrawWithHint("##Filter", "Filter (incl -excl)")
    if ImGui.BeginChild("##items", ImVec2(-FLT_MIN, ImGui.GetTextLineHeightWithSpacing() * 15), ImGuiChildFlags.FrameStyle) then
        for _, item in ipairs({ "aaa1.c", "bbb1.c", "ccc1.c", "aaa2.cpp", "bbb2.cpp", "ccc2.cpp", "abc.h", "hello, world" }) do
            if filter:PassFilter(item) then ImGui.TextUnformatted(item) end
        end
        for _, item in ipairs(ExampleNames) do
            if filter:PassFilter(item) then ImGui.TextUnformatted(item) end
        end
    end
    ImGui.EndChild()
    ImGui.TreePop()
end

S.ti = {
    text = Buf("/*\n The Pentium F00F bug, shorthand for F0 0F C7 C8,\n the hexadecimal encoding of one offending instruction,\n more formally, the invalid operand with locked CMPXCHG8B\n instruction bug, is a design flaw in the majority of\n Intel Pentium, Pentium MMX, and Pentium OverDrive\n processors (all in the P5 microarchitecture).\n*/\n\nlabel:\n\tlock cmpxchg8b eax\n", 1024 * 16),
    ml_flags = ImGuiInputTextFlags.AllowTabInput,
    f = { Buf("", 32), Buf("", 32), Buf("", 32), Buf("", 32), Buf("", 32), Buf("", 32), Buf("", 32) },
    password = Buf("password123", 64), cb1 = Buf("", 64), cb2 = Buf("", 64), cb3 = Buf("", 64), edit_count = { 0 },
    rs_flags = 0, rs = Buf("", 1024),
    elide = Buf("/path/to/some/folder/with/long/filename.cpp", 128), elide_flags = ImGuiInputTextFlags.ElideLeft,
    misc = Buf("", 16), misc_flags = ImGuiInputTextFlags.EscapeClearsAll }
function DemoWindowWidgetsTextInput()
    if not ImGui.TreeNode("Text Input") then return end
    local s = S.ti
    local IT = ImGuiInputTextFlags
    local function FlagBox(key, name)
        if IT[name] then _, s[key] = ImGui.CheckboxFlags("ImGuiInputTextFlags_" .. name, s[key], IT[name]) end
    end
    if ImGui.TreeNode("Multi-line Text Input") then
        HelpMarker("You can use the ImGuiInputTextFlags_CallbackResize facility if you need to wire InputTextMultiline() to a dynamic string type.")
        FlagBox("ml_flags", "ReadOnly")
        FlagBox("ml_flags", "WordWrap")
        ImGui.SameLine(); HelpMarker("Feature is currently in Beta. Please read comments in imgui.h")
        FlagBox("ml_flags", "AllowTabInput")
        ImGui.SameLine(); HelpMarker("When _AllowTabInput is set, passing through the widget with Tabbing doesn't automatically activate it, in order to also cycling through subsequent widgets.")
        FlagBox("ml_flags", "CtrlEnterForNewLine")
        ImGui.InputTextMultiline("##source", s.text, 1024 * 16, ImVec2(-FLT_MIN, ImGui.GetTextLineHeight() * 16), s.ml_flags)
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Filtered Text Input") then
        local a, z, A, Z = string.byte("a"), string.byte("z"), string.byte("A"), string.byte("Z")
        local function FilterCasingSwap(data)
            local c = data.EventChar
            if c >= a and c <= z then data.EventChar = c - (a - A)
            elseif c >= A and c <= Z then data.EventChar = c + (a - A) end
            return 0
        end
        local function FilterImGuiLetters(data)
            local c = data.EventChar
            if c < 256 and string.find("imgui", string.char(c), 1, true) then return 0 end
            return 1
        end
        local f = s.f
        ImGui.InputText("default", f[1], 32)
        ImGui.InputText("decimal", f[2], 32, IT.CharsDecimal)
        ImGui.InputText("hexadecimal", f[3], 32, bit32.bor(IT.CharsHexadecimal, IT.CharsUppercase))
        ImGui.InputText("uppercase", f[4], 32, IT.CharsUppercase)
        ImGui.InputText("no blank", f[5], 32, IT.CharsNoBlank)
        ImGui.InputText("casing swap", f[6], 32, IT.CallbackCharFilter, FilterCasingSwap)
        ImGui.InputText("\"imgui\"", f[7], 32, IT.CallbackCharFilter, FilterImGuiLetters)
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Password Input") then
        ImGui.InputText("password", s.password, 64, IT.Password)
        ImGui.SameLine(); HelpMarker("Display all characters as '*'.\nDisable clipboard cut and copy.\nDisable logging.\n")
        ImGui.InputTextWithHint("password (w/ hint)", "<password>", s.password, 64, IT.Password)
        ImGui.InputText("password (clear)", s.password, 64)
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Completion, History, Edit Callbacks") then
        local function MyCallback(data)
            if data.EventFlag == IT.CallbackCompletion then
                data:InsertChars(data.CursorPos, "..")
            elseif data.EventFlag == IT.CallbackHistory then
                if data.EventKey == ImGuiKey.UpArrow then
                    data:DeleteChars(0, data.BufTextLen)
                    data:InsertChars(0, "Pressed Up!")
                    data:SelectAll()
                elseif data.EventKey == ImGuiKey.DownArrow then
                    data:DeleteChars(0, data.BufTextLen)
                    data:InsertChars(0, "Pressed Down!")
                    data:SelectAll()
                end
            elseif data.EventFlag == IT.CallbackEdit then
                local c = data.Buf[1]
                if (c >= 97 and c <= 122) or (c >= 65 and c <= 90) then data.Buf[1] = bit32.bxor(c, 32) end
                data.BufDirty = true
                local p_int = data.UserData
                p_int[1] = p_int[1] + 1
            end
            return 0
        end
        ImGui.InputText("Completion", s.cb1, 64, IT.CallbackCompletion, MyCallback)
        ImGui.SameLine(); HelpMarker("Here we append \"..\" each time Tab is pressed. See 'Examples>Console' for a more meaningful demonstration of using this callback.")
        ImGui.InputText("History", s.cb2, 64, IT.CallbackHistory, MyCallback)
        ImGui.SameLine(); HelpMarker("Here we replace and select text each time Up/Down are pressed. See 'Examples>Console' for a more meaningful demonstration of using this callback.")
        ImGui.InputText("Edit", s.cb3, 64, IT.CallbackEdit, MyCallback, s.edit_count)
        ImGui.SameLine(); HelpMarker("Here we toggle the casing of the first character on every edit + count edits.")
        ImGui.SameLine(); ImGui.Text("(%d)", s.edit_count[1])
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Resize Callback") then
        HelpMarker("Using ImGuiInputTextFlags_CallbackResize to wire your custom string type to InputText().\n\n(Lua port: fixed 1024 byte buffer, CallbackResize growth not supported)")
        FlagBox("rs_flags", "WordWrap")
        ImGui.InputTextMultiline("##MyStr", s.rs, 1024, ImVec2(-FLT_MIN, ImGui.GetTextLineHeight() * 16), s.rs_flags)
        ImGui.Text("Size: %d\nCapacity: %d", #BufStr(s.rs) + 1, 1024)
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Eliding, Alignment") then
        FlagBox("elide_flags", "ElideLeft")
        ImGui.InputText("Path", s.elide, 128, s.elide_flags)
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Miscellaneous") then
        FlagBox("misc_flags", "EscapeClearsAll")
        FlagBox("misc_flags", "ReadOnly")
        FlagBox("misc_flags", "NoUndoRedo")
        ImGui.InputText("Hello", s.misc, 16, s.misc_flags)
        ImGui.TreePop()
    end
    ImGui.TreePop()
end

S.tt = { arr = { 0.6, 0.1, 1.0, 0.5, 0.92, 0.1, 0.2 }, always_on = 0 }
function DemoWindowWidgetsTooltips()
    if not ImGui.TreeNode("Tooltips") then return end
    local s = S.tt
    local HF = ImGuiHoveredFlags
    ImGui.SeparatorText("General")
    HelpMarker("Tooltip are typically created by using a IsItemHovered() + SetTooltip() sequence.\n\nWe provide a helper SetItemTooltip() function to perform the two with standards flags.")
    local sz = ImVec2(-FLT_MIN, 0.0)
    ImGui.Button("Basic", sz)
    ImGui.SetItemTooltip("I am a tooltip")
    ImGui.Button("Fancy", sz)
    if ImGui.BeginItemTooltip() then
        ImGui.Text("I am a fancy tooltip")
        ImGui.PlotLines("Curve", s.arr, nil, #s.arr)
        ImGui.Text("Sin(time) = %f", math.sin(ImGui.GetTime()))
        ImGui.EndTooltip()
    end

    ImGui.SeparatorText("Always On")
    _, s.always_on = ImGui.RadioButton("Off", s.always_on, 0)
    ImGui.SameLine()
    _, s.always_on = ImGui.RadioButton("Always On (Simple)", s.always_on, 1)
    ImGui.SameLine()
    _, s.always_on = ImGui.RadioButton("Always On (Advanced)", s.always_on, 2)
    if s.always_on == 1 then
        ImGui.SetTooltip("I am following you around.")
    elseif s.always_on == 2 and ImGui.BeginTooltip() then
        ImGui.ProgressBar(math.sin(ImGui.GetTime()) * 0.5 + 0.5, ImVec2(ImGui.GetFontSize() * 25, 0.0))
        ImGui.EndTooltip()
    end

    ImGui.SeparatorText("Custom")
    HelpMarker("Passing ImGuiHoveredFlags_ForTooltip to IsItemHovered() is the preferred way to standardize tooltip activation details across your application. You may however decide to use custom flags for a specific tooltip instance.")
    ImGui.Button("Manual", sz)
    if ImGui.IsItemHovered(HF.ForTooltip) then ImGui.SetTooltip("I am a manually emitted tooltip.") end
    ImGui.Button("DelayNone", sz)
    if ImGui.IsItemHovered(HF.DelayNone) then ImGui.SetTooltip("I am a tooltip with no delay.") end
    ImGui.Button("DelayShort", sz)
    if ImGui.IsItemHovered(bit32.bor(HF.DelayShort, HF.NoSharedDelay)) then ImGui.SetTooltip("I am a tooltip with a short delay (%0.2f sec).", ImGui.GetStyle().HoverDelayShort) end
    ImGui.Button("DelayLong", sz)
    if ImGui.IsItemHovered(bit32.bor(HF.DelayNormal, HF.NoSharedDelay)) then ImGui.SetTooltip("I am a tooltip with a long delay (%0.2f sec).", ImGui.GetStyle().HoverDelayNormal) end
    ImGui.Button("Stationary", sz)
    if ImGui.IsItemHovered(HF.Stationary) then ImGui.SetTooltip("I am a tooltip requiring mouse to be stationary before activating.") end
    ImGui.BeginDisabled()
    ImGui.Button("Disabled item", sz)
    if ImGui.IsItemHovered(HF.ForTooltip) then ImGui.SetTooltip("I am a tooltip for a disabled item.") end
    ImGui.EndDisabled()
    ImGui.TreePop()
end

S.tn = { lines_flags = bit32.bor(ImGuiTreeNodeFlags.DrawLinesFull, ImGuiTreeNodeFlags.DefaultOpen), selection_mask = 0,
    adv_flags = bit32.bor(ImGuiTreeNodeFlags.OpenOnArrow, ImGuiTreeNodeFlags.OpenOnDoubleClick, ImGuiTreeNodeFlags.SpanAvailWidth),
    align_label = false, use_dnd = false }
function DemoWindowWidgetsTreeNodes()
    if not ImGui.TreeNode("Tree Nodes") then return end
    local s = S.tn
    local TN = ImGuiTreeNodeFlags
    if ImGui.TreeNode("Basic Trees") then
        for i = 0, 4 do
            if i == 0 then ImGui.SetNextItemOpen(true, ImGuiCond.Once) end
            ImGui.PushID(i)
            if ImGui.TreeNode("", "Child %d", i) then
                ImGui.Text("blah blah")
                ImGui.SameLine()
                if ImGui.SmallButton("button") then end
                ImGui.TreePop()
            end
            ImGui.PopID()
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Hierarchy Lines") then
        HelpMarker("Default option for DrawLinesXXX is stored in style.TreeLinesFlags")
        _, s.lines_flags = ImGui.CheckboxFlags("ImGuiTreeNodeFlags_DrawLinesNone", s.lines_flags, TN.DrawLinesNone)
        _, s.lines_flags = ImGui.CheckboxFlags("ImGuiTreeNodeFlags_DrawLinesFull", s.lines_flags, TN.DrawLinesFull)
        _, s.lines_flags = ImGui.CheckboxFlags("ImGuiTreeNodeFlags_DrawLinesToNodes", s.lines_flags, TN.DrawLinesToNodes)
        local f = s.lines_flags
        if ImGui.TreeNodeEx("Parent", f) then
            if ImGui.TreeNodeEx("Child 1", f) then ImGui.Button("Button for Child 1"); ImGui.TreePop() end
            if ImGui.TreeNodeEx("Child 2", f) then ImGui.Button("Button for Child 2"); ImGui.TreePop() end
            ImGui.Text("Remaining contents")
            ImGui.Text("Remaining contents")
            ImGui.TreePop()
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Clipping Large Trees") then
        ImGui.TextWrapped("- Using ImGuiListClipper with trees is a less easy than on arrays or grids.\n- Refer to 'Demo->Examples->Property Editor' for an example of how to do that.\n- Discuss in #3823")
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Selectable Nodes") then
        HelpMarker("Manually implemented selectable nodes.\nClick to select, Ctrl+Click to toggle, click on arrows or double-click to open.")
        local node_clicked_idx = -1
        for node_n = 0, 5 do
            local flags = bit32.bor(TN.OpenOnArrow, TN.OpenOnDoubleClick, TN.SpanAvailWidth)
            if bit32.band(s.selection_mask, bit32.lshift(1, node_n)) ~= 0 then flags = bit32.bor(flags, TN.Selected) end
            local is_open = ImGui.TreeNodeEx(node_n, flags, "Selectable Node %d", node_n)
            if ImGui.IsItemClicked() and not ImGui.IsItemToggledOpen() then node_clicked_idx = node_n end
            if is_open then
                ImGui.BulletText("<Node contents here>")
                ImGui.TreePop()
            end
        end
        if node_clicked_idx ~= -1 then
            if ImGui.GetIO().KeyCtrl then
                s.selection_mask = bit32.bxor(s.selection_mask, bit32.lshift(1, node_clicked_idx))
            else
                s.selection_mask = bit32.lshift(1, node_clicked_idx)
            end
        end
        ImGui.TreePop()
    end

    if ImGui.TreeNode("Advanced") then
        local function FB(name, help)
            _, s.adv_flags = ImGui.CheckboxFlags("ImGuiTreeNodeFlags_" .. name, s.adv_flags, TN[name])
            if help then ImGui.SameLine(); HelpMarker(help) end
        end
        FB("OpenOnArrow"); FB("OpenOnDoubleClick")
        FB("SpanAvailWidth", "Extend hit area to all available width instead of allowing more items to be laid out after the node.")
        FB("SpanFullWidth")
        FB("SpanLabelWidth", "Reduce hit area to the text label and a bit of margin.")
        FB("SpanAllColumns", "For use in Tables only.")
        FB("AllowOverlap")
        FB("Framed", "Draw frame with background (e.g. for CollapsingHeader)")
        FB("FramePadding"); FB("NavLeftJumpsToParent")
        HelpMarker("Default option for DrawLinesXXX is stored in style.TreeLinesFlags")
        FB("DrawLinesNone"); FB("DrawLinesFull"); FB("DrawLinesToNodes")
        _, s.align_label = ImGui.Checkbox("Align label with current X position", s.align_label)
        _, s.use_dnd = ImGui.Checkbox("Make Tree Nodes as drag & drop sources", s.use_dnd)
        if s.align_label then ImGui.Unindent(ImGui.GetTreeNodeToLabelSpacing()) end
        for node_n = 0, 5 do
            local node_flags = s.adv_flags
            if node_n < 3 then
                local is_open = ImGui.TreeNodeEx(node_n, node_flags, "Selectable Node %d", node_n)
                if s.use_dnd and ImGui.BeginDragDropSource() then
                    ImGui.SetDragDropPayload("MY_TREENODE_PAYLOAD_TYPE", nil, 0)
                    ImGui.Text("This is a drag and drop source")
                    ImGui.EndDragDropSource()
                end
                if node_n == 2 and bit32.band(s.adv_flags, TN.SpanLabelWidth) ~= 0 then
                    ImGui.SameLine()
                    if ImGui.SmallButton("button") then end
                end
                if is_open then
                    ImGui.BulletText("Blah blah\nBlah Blah")
                    ImGui.SameLine()
                    ImGui.SmallButton("Button")
                    ImGui.TreePop()
                end
            else
                node_flags = bit32.bor(node_flags, TN.Leaf, TN.NoTreePushOnOpen)
                ImGui.TreeNodeEx(node_n, node_flags, "Selectable Leaf %d", node_n)
                if s.use_dnd and ImGui.BeginDragDropSource() then
                    ImGui.SetDragDropPayload("MY_TREENODE_PAYLOAD_TYPE", nil, 0)
                    ImGui.Text("This is a drag and drop source")
                    ImGui.EndDragDropSource()
                end
            end
        end
        if s.align_label then ImGui.Indent(ImGui.GetTreeNodeToLabelSpacing()) end
        ImGui.TreePop()
    end
    ImGui.TreePop()
end

S.vs = { int_value = 0, values = { 0.0, 0.60, 0.35, 0.9, 0.70, 0.20, 0.0 }, values2 = { 0.20, 0.80, 0.40, 0.25 } }
function DemoWindowWidgetsVerticalSliders()
    if not ImGui.TreeNode("Vertical Sliders") then return end
    local s = S.vs
    local spacing = 4
    ImGui.PushStyleVar(ImGuiStyleVar.ItemSpacing, ImVec2(spacing, spacing))
    s.int_value = ImGui.VSliderInt("##int", ImVec2(18, 160), s.int_value, 0, 5)
    ImGui.SameLine()
    local values = s.values
    ImGui.PushID("set1")
    for i = 0, 6 do
        if i > 0 then ImGui.SameLine() end
        ImGui.PushID(i)
        ImGui.PushStyleColor(ImGuiCol.FrameBg, HSV(i / 7.0, 0.5, 0.5))
        ImGui.PushStyleColor(ImGuiCol.FrameBgHovered, HSV(i / 7.0, 0.6, 0.5))
        ImGui.PushStyleColor(ImGuiCol.FrameBgActive, HSV(i / 7.0, 0.7, 0.5))
        ImGui.PushStyleColor(ImGuiCol.SliderGrab, HSV(i / 7.0, 0.9, 0.9))
        values[i + 1] = ImGui.VSliderFloat("##v", ImVec2(18, 160), values[i + 1], 0.0, 1.0, "")
        if ImGui.IsItemActive() or ImGui.IsItemHovered() then ImGui.SetTooltip("%.3f", values[i + 1]) end
        ImGui.PopStyleColor(4)
        ImGui.PopID()
    end
    ImGui.PopID()

    ImGui.SameLine()
    ImGui.PushID("set2")
    local rows = 3
    local small_slider_size = ImVec2(18, math.floor((160.0 - (rows - 1) * spacing) / rows))
    for nx = 0, 3 do
        if nx > 0 then ImGui.SameLine() end
        ImGui.BeginGroup()
        for ny = 0, rows - 1 do
            ImGui.PushID(nx * rows + ny)
            s.values2[nx + 1] = ImGui.VSliderFloat("##v", small_slider_size, s.values2[nx + 1], 0.0, 1.0, "")
            if ImGui.IsItemActive() or ImGui.IsItemHovered() then ImGui.SetTooltip("%.3f", s.values2[nx + 1]) end
            ImGui.PopID()
        end
        ImGui.EndGroup()
    end
    ImGui.PopID()

    ImGui.SameLine()
    ImGui.PushID("set3")
    for i = 0, 3 do
        if i > 0 then ImGui.SameLine() end
        ImGui.PushID(i)
        ImGui.PushStyleVar(ImGuiStyleVar.GrabMinSize, 40)
        values[i + 1] = ImGui.VSliderFloat("##v", ImVec2(40, 160), values[i + 1], 0.0, 1.0, "%.2f\nsec")
        ImGui.PopStyleVar()
        ImGui.PopID()
    end
    ImGui.PopID()
    ImGui.PopStyleVar()
    ImGui.TreePop()
end

----------------------------------------------------------------
-- [SECTION] Example App: Main Menu Bar / ShowExampleAppMainMenuBar()
----------------------------------------------------------------

S.menu = { enabled = true, f = 0.5, n = 0, b = true }
function ShowExampleMenuFile()
    local s = S.menu
    ImGui.MenuItem("(demo menu)", nil, false, false)
    if ImGui.MenuItem("New") then end
    if ImGui.MenuItem("Open", "Ctrl+O") then end
    if ImGui.BeginMenu("Open Recent") then
        ImGui.MenuItem("fish_hat.c")
        ImGui.MenuItem("fish_hat.inl")
        ImGui.MenuItem("fish_hat.h")
        if ImGui.BeginMenu("More..") then
            ImGui.MenuItem("Hello")
            ImGui.MenuItem("Sailor")
            if ImGui.BeginMenu("Recurse..") then
                ShowExampleMenuFile()
                ImGui.EndMenu()
            end
            ImGui.EndMenu()
        end
        ImGui.EndMenu()
    end
    if ImGui.MenuItem("Save", "Ctrl+S") then end
    if ImGui.MenuItem("Save As..") then end

    ImGui.Separator()
    if ImGui.BeginMenu("Options") then
        _, s.enabled = ImGui.MenuItem("Enabled", "", s.enabled)
        ImGui.BeginChild("child", ImVec2(0, ImGui.GetTextLineHeightWithSpacing() * 5.0), ImGuiChildFlags.Borders)
        for i = 0, 9 do ImGui.Text("Scrolling Text %d", i) end
        ImGui.EndChild()
        s.f = ImGui.SliderFloat("Value", s.f, 0.0, 1.0)
        s.f = ImGui.InputFloat("Input", s.f, 0.1)
        s.n = ImGui.Combo("Combo", s.n, "Yes\0No\0Maybe\0\0")
        ImGui.EndMenu()
    end

    if ImGui.BeginMenu("Colors") then
        local sz = ImGui.GetTextLineHeight()
        for i = 0, ImGuiCol.COUNT - 1 do
            local name = ImGui.GetStyleColorName(i)
            local p = ImGui.GetCursorScreenPos()
            ImGui.GetWindowDrawList():AddRectFilled(p, ImVec2(p.x + sz, p.y + sz), ImGui.GetColorU32(i))
            ImGui.Dummy(ImVec2(sz, sz))
            ImGui.SameLine()
            ImGui.MenuItem(name)
        end
        ImGui.EndMenu()
    end

    -- Here we demonstrate appending again to the "Options" menu (which we already created above)
    if ImGui.BeginMenu("Options") then
        _, s.b = ImGui.Checkbox("SomeOption", s.b)
        ImGui.EndMenu()
    end

    if ImGui.BeginMenu("Disabled", false) then
        IM_ASSERT(false)
    end
    if ImGui.MenuItem("Checked", nil, true) then end
    ImGui.Separator()
    if ImGui.MenuItem("Quit", "Alt+F4") then end
end

function ShowExampleAppMainMenuBar()
    if ImGui.BeginMainMenuBar() then
        if ImGui.BeginMenu("File") then
            ShowExampleMenuFile()
            ImGui.EndMenu()
        end
        if ImGui.BeginMenu("Edit") then
            if ImGui.MenuItem("Undo", "Ctrl+Z") then end
            if ImGui.MenuItem("Redo", "Ctrl+Y", false, false) then end
            ImGui.Separator()
            if ImGui.MenuItem("Cut", "Ctrl+X") then end
            if ImGui.MenuItem("Copy", "Ctrl+C") then end
            if ImGui.MenuItem("Paste", "Ctrl+V") then end
            ImGui.EndMenu()
        end
        ImGui.EndMainMenuBar()
    end
end

----------------------------------------------------------------
-- [SECTION] Style Editor / ShowStyleEditor()
----------------------------------------------------------------

-- Deep copy of an ImGuiStyle (ImVec2/ImVec4 fields and Colors[] are copied by value)
local function StyleCopy(dst, src)
    for k, v in pairs(src) do
        if k == "Colors" then
            dst.Colors = dst.Colors or {}
            for i, c in pairs(v) do
                if type(c) == "table" then dst.Colors[i] = dst.Colors[i] or ImVec4(); ImVec4_Copy(dst.Colors[i], c) else dst.Colors[i] = c end
            end
        elseif type(v) == "table" and getmetatable(v) ~= nil and type(v[1]) == "number" then
            local c = dst[k]
            if type(c) ~= "table" then c = setmetatable({}, getmetatable(v)); dst[k] = c end
            for i = 1, #v do rawset(c, i, v[i]) end
        else
            dst[k] = v
        end
    end
    if getmetatable(dst) == nil then setmetatable(dst, getmetatable(src)) end
    return dst
end

local function ColorsEqual(a, b) return a[1] == b[1] and a[2] == b[2] and a[3] == b[3] and a[4] == b[4] end

S.ss = { style_idx = -1 }
function ImGui.ShowStyleSelector(label)
    local s = S.ss
    local style_names = { "Dark", "Light", "Classic" }
    local ret = false
    if ImGui.BeginCombo(label, style_names[s.style_idx + 1] or "") then
        for n = 0, 2 do
            if ImGui.Selectable(style_names[n + 1], s.style_idx == n, ImGuiSelectableFlags.SelectOnNav) then
                s.style_idx = n
                ret = true
                if n == 0 then ImGui.StyleColorsDark() elseif n == 1 then ImGui.StyleColorsLight() else ImGui.StyleColorsClassic() end
            elseif s.style_idx == n then
                ImGui.SetItemDefaultFocus()
            end
        end
        ImGui.EndCombo()
    end
    return ret
end

local function GetTreeLinesFlagsName(flags)
    local TN = ImGuiTreeNodeFlags
    if flags == TN.DrawLinesNone then return "DrawLinesNone" end
    if flags == TN.DrawLinesFull then return "DrawLinesFull" end
    if flags == TN.DrawLinesToNodes then return "DrawLinesToNodes" end
    return ""
end

S.se = { ref_saved_style = nil, init = true, output_dest = 0, output_only_modified = true, alpha_flags = 0, filter = nil }
function ImGui.ShowStyleEditor(ref)
    local se = S.se
    local style = ImGui.GetStyle()
    if se.ref_saved_style == nil then se.ref_saved_style = {} end
    if se.init and ref == nil then StyleCopy(se.ref_saved_style, style) end
    se.init = false
    if ref == nil then ref = se.ref_saved_style end

    local default_border_size = math.floor(style._MainScale or 1.0)
    local max_border_size = math.max(default_border_size, 2.0)
    local function SF(name, mn, mx, fmt) if style[name] ~= nil then style[name] = ImGui.SliderFloat(name, style[name], mn, mx, fmt or "%.0f") end end
    local function SF2(name, mn, mx, fmt) if style[name] ~= nil then ImGui.SliderFloat2(name, style[name], mn, mx, fmt or "%.0f") end end
    local function DF(name, speed, mn, mx, fmt, flags) if style[name] ~= nil then style[name] = ImGui.DragFloat(name, style[name], speed, mn, mx, fmt or "%.0f", flags) end end

    ImGui.PushItemWidth(ImGui.GetWindowWidth() * 0.50)

    ImGui.SeparatorText("General")
    if bit32.band(ImGui.GetIO().BackendFlags, ImGuiBackendFlags.RendererHasTextures) == 0 then
        ImGui.BulletText("Warning: Font scaling will NOT be smooth, because\nImGuiBackendFlags_RendererHasTextures is not set!")
        ImGui.BulletText("For instructions, see:")
        ImGui.SameLine()
        ImGui.TextLinkOpenURL("docs/BACKENDS.md", "https://github.com/ocornut/imgui/blob/master/docs/BACKENDS.md")
    end
    if ImGui.ShowStyleSelector("Colors##Selector") then StyleCopy(se.ref_saved_style, style) end
    if ImGui.ShowFontSelector then ImGui.ShowFontSelector("Fonts##Selector") end
    local changed
    style.FontSizeBase, changed = ImGui.DragFloat("FontSizeBase", style.FontSizeBase, 0.20, 5.0, 100.0, "%.0f")
    if changed then style._NextFrameFontSizeBase = style.FontSizeBase end
    ImGui.SameLine(0.0, 0.0); ImGui.Text(" (out %.2f)", ImGui.GetFontSize())
    style.FontScaleMain = ImGui.DragFloat("FontScaleMain", style.FontScaleMain, 0.02, 0.5, 4.0)
    ImGui.BeginDisabled(ImGui.GetIO().ConfigDpiScaleFonts == true)
    style.FontScaleDpi = ImGui.DragFloat("FontScaleDpi", style.FontScaleDpi, 0.02, 0.5, 4.0)
    ImGui.SetItemTooltip("When io.ConfigDpiScaleFonts is set, this value is automatically overwritten.")
    ImGui.EndDisabled()

    style.FrameRounding, changed = ImGui.SliderFloat("FrameRounding", style.FrameRounding, 0.0, 12.0, "%.0f")
    if changed then style.GrabRounding = style.FrameRounding end
    local p, border
    p, border = ImGui.Checkbox("WindowBorder", style.WindowBorderSize > 0.0); if p then style.WindowBorderSize = border and default_border_size or 0.0 end
    ImGui.SameLine()
    p, border = ImGui.Checkbox("FrameBorder", style.FrameBorderSize > 0.0); if p then style.FrameBorderSize = border and default_border_size or 0.0 end
    ImGui.SameLine()
    p, border = ImGui.Checkbox("PopupBorder", style.PopupBorderSize > 0.0); if p then style.PopupBorderSize = border and default_border_size or 0.0 end

    if ImGui.Button("Save Ref") then StyleCopy(se.ref_saved_style, style); if ref ~= se.ref_saved_style then StyleCopy(ref, style) end end
    ImGui.SameLine()
    if ImGui.Button("Revert Ref") then StyleCopy(style, ref) end
    ImGui.SameLine()
    HelpMarker("Save/Revert in local non-persistent storage. Default Colors definition are not affected. Use \"Export\" below to save them somewhere.")

    ImGui.SeparatorText("Details")
    if ImGui.BeginTabBar("##tabs", ImGuiTabBarFlags.None) then
        if ImGui.BeginTabItem("Sizes") then
            ImGui.SeparatorText("Main")
            SF2("WindowPadding", 0.0, 20.0); SF2("FramePadding", 0.0, 20.0); SF2("ItemSpacing", 0.0, 20.0)
            SF2("ItemInnerSpacing", 0.0, 20.0); SF2("TouchExtraPadding", 0.0, 10.0)
            SF("IndentSpacing", 0.0, 30.0); SF("GrabMinSize", 1.0, 20.0)

            ImGui.SeparatorText("Borders")
            SF("WindowBorderSize", 0.0, max_border_size); SF("ChildBorderSize", 0.0, max_border_size)
            SF("PopupBorderSize", 0.0, max_border_size); SF("FrameBorderSize", 0.0, max_border_size)

            ImGui.SeparatorText("Rounding")
            SF("WindowRounding", 0.0, 12.0); SF("ChildRounding", 0.0, 12.0); SF("FrameRounding", 0.0, 12.0)
            SF("PopupRounding", 0.0, 12.0); SF("GrabRounding", 0.0, 12.0); SF("MenuItemRounding", 0.0, 12.0)

            ImGui.SeparatorText("Scrollbar")
            SF("ScrollbarSize", 1.0, 20.0); SF("ScrollbarRounding", 0.0, 12.0); SF("ScrollbarPadding", 0.0, 10.0)

            ImGui.SeparatorText("Tabs")
            SF("TabBorderSize", 0.0, max_border_size); SF("TabBarBorderSize", 0.0, max_border_size)
            SF("TabBarOverlineSize", 0.0, math.max(3.0, max_border_size))
            ImGui.SameLine(); HelpMarker("Overline is only drawn over the selected tab when ImGuiTabBarFlags_DrawSelectedOverline is set.")
            DF("TabMinWidthBase", 0.5, 1.0, 500.0); DF("TabMinWidthShrink", 0.5, 1.0, 500.0, "%0.f")
            if style.TabCloseButtonMinWidthSelected ~= nil then
                DF("TabCloseButtonMinWidthSelected", 0.5, -1.0, 100.0, (style.TabCloseButtonMinWidthSelected < 0.0) and "%.0f (Always)" or "%.0f")
                DF("TabCloseButtonMinWidthUnselected", 0.5, -1.0, 100.0, (style.TabCloseButtonMinWidthUnselected < 0.0) and "%.0f (Always)" or "%.0f")
            end
            SF("TabRounding", 0.0, 12.0)

            ImGui.SeparatorText("Tables")
            SF2("CellPadding", 0.0, 20.0)
            style.TableAngledHeadersAngle = ImGui.SliderAngle("TableAngledHeadersAngle", style.TableAngledHeadersAngle, -50.0, 50.0)
            SF2("TableAngledHeadersTextAlign", 0.0, 1.0, "%.2f")

            ImGui.SeparatorText("Trees")
            local combo_open = ImGui.BeginCombo("TreeLinesFlags", GetTreeLinesFlagsName(style.TreeLinesFlags))
            ImGui.SameLine()
            HelpMarker("[Experimental] Tree lines may not work in all situations (e.g. using a clipper) and may incurs slight traversal overhead.\n\nImGuiTreeNodeFlags_DrawLinesFull is faster than ImGuiTreeNodeFlags_DrawLinesToNode.")
            if combo_open then
                local TN = ImGuiTreeNodeFlags
                for _, option in ipairs({ TN.DrawLinesNone, TN.DrawLinesFull, TN.DrawLinesToNodes }) do
                    if ImGui.Selectable(GetTreeLinesFlagsName(option), style.TreeLinesFlags == option) then style.TreeLinesFlags = option end
                end
                ImGui.EndCombo()
            end
            SF("TreeLinesSize", 0.0, max_border_size); SF("TreeLinesRounding", 0.0, 12.0)

            ImGui.SeparatorText("Windows")
            SF2("WindowTitleAlign", 0.0, 1.0, "%.2f"); SF("WindowBorderHoverPadding", 1.0, 20.0)
            local window_menu_button_position = style.WindowMenuButtonPosition + 1
            window_menu_button_position, changed = ImGui.Combo("WindowMenuButtonPosition", window_menu_button_position, "None\0Left\0Right\0")
            if changed then style.WindowMenuButtonPosition = window_menu_button_position - 1 end

            ImGui.SeparatorText("Widgets")
            SF("ColorMarkerSize", 0.0, 8.0)
            style.ColorButtonPosition = ImGui.Combo("ColorButtonPosition", style.ColorButtonPosition, "Left\0Right\0")
            SF2("ButtonTextAlign", 0.0, 1.0, "%.2f")
            ImGui.SameLine(); HelpMarker("Alignment applies when a button is larger than its text content.")
            SF2("SelectableTextAlign", 0.0, 1.0, "%.2f")
            ImGui.SameLine(); HelpMarker("Alignment applies when a selectable is larger than its text content.")
            SF("SeparatorSize", 0.0, 10.0); SF("SeparatorTextBorderSize", 0.0, 10.0)
            SF2("SeparatorTextAlign", 0.0, 1.0, "%.2f"); SF2("SeparatorTextPadding", 0.0, 40.0)
            SF("LogSliderDeadzone", 0.0, 12.0); SF("ImageRounding", 0.0, 12.0); SF("ImageBorderSize", 0.0, max_border_size)

            ImGui.SeparatorText("Docking")
            _, style.DockingNodeHasCloseButton = ImGui.Checkbox("DockingNodeHasCloseButton", style.DockingNodeHasCloseButton)
            SF("DockingSeparatorSize", 0.0, 12.0)

            ImGui.SeparatorText("Tooltips")
            for n = 0, 1 do
                local key = (n == 0) and "HoverFlagsForTooltipMouse" or "HoverFlagsForTooltipNav"
                if ImGui.TreeNodeEx(key) then
                    for _, f in ipairs({ "DelayNone", "DelayShort", "DelayNormal", "Stationary", "NoSharedDelay" }) do
                        _, style[key] = ImGui.CheckboxFlags("ImGuiHoveredFlags_" .. f, style[key], ImGuiHoveredFlags[f])
                    end
                    ImGui.TreePop()
                end
            end

            ImGui.SeparatorText("Misc")
            SF2("DisplayWindowPadding", 0.0, 30.0); ImGui.SameLine(); HelpMarker("Apply to regular windows: amount which we enforce to keep visible when moving near edges of your screen.")
            SF2("DisplaySafeAreaPadding", 0.0, 30.0); ImGui.SameLine(); HelpMarker("Apply to every windows, menus, popups, tooltips: amount where we avoid displaying contents. Adjust if you cannot see the edges of your screen (e.g. on a TV where scaling has not been configured).")
            ImGui.EndTabItem()
        end

        if ImGui.BeginTabItem("Colors") then
            if ImGui.Button("Export") then
                if se.output_dest == 0 then ImGui.LogToClipboard() else ImGui.LogToTTY() end
                ImGui.LogText("ImVec4* colors = GetStyle().Colors;\n")
                for i = 0, ImGuiCol.COUNT - 1 do
                    local col = style.Colors[i]
                    local name = ImGui.GetStyleColorName(i)
                    if not se.output_only_modified or not ColorsEqual(col, ref.Colors[i]) then
                        ImGui.LogText("colors[ImGuiCol_%s]%s= ImVec4(%.2ff, %.2ff, %.2ff, %.2ff);\n", name, string.rep(" ", math.max(0, 23 - #name)), col.x, col.y, col.z, col.w)
                    end
                end
                ImGui.LogFinish()
            end
            ImGui.SameLine(); ImGui.SetNextItemWidth(ImGui.GetFontSize() * 10)
            se.output_dest = ImGui.Combo("##output_type", se.output_dest, "To Clipboard\0To TTY\0")
            ImGui.SameLine(); _, se.output_only_modified = ImGui.Checkbox("Only Modified Colors", se.output_only_modified)

            local CE = ImGuiColorEditFlags
            if ImGui.RadioButtonEx("Opaque", se.alpha_flags == CE.AlphaOpaque) then se.alpha_flags = CE.AlphaOpaque end ImGui.SameLine()
            if ImGui.RadioButtonEx("Alpha", se.alpha_flags == CE.None) then se.alpha_flags = CE.None end ImGui.SameLine()
            if ImGui.RadioButtonEx("Both", se.alpha_flags == CE.AlphaPreviewHalf) then se.alpha_flags = CE.AlphaPreviewHalf end ImGui.SameLine()
            HelpMarker("In the color list:\nLeft-click on color square to open color picker,\nRight-click to open edit options menu.")

            se.filter = se.filter or ImGuiTextFilter()
            ImGui.SetNextItemWidth(-FLT_MIN)
            se.filter:DrawWithHint("##FilterColors", "Filter Colors (incl -excl)")

            ImGui.SetNextWindowSizeConstraints(ImVec2(0.0, ImGui.GetTextLineHeightWithSpacing() * 10), ImVec2(FLT_MAX, FLT_MAX))
            ImGui.BeginChild("##colors", ImVec2(0, 0), bit32.bor(ImGuiChildFlags.Borders, ImGuiChildFlags.NavFlattened), bit32.bor(ImGuiWindowFlags.AlwaysVerticalScrollbar, ImGuiWindowFlags.AlwaysHorizontalScrollbar))
            ImGui.PushItemWidth(ImGui.GetFontSize() * -12)
            for i = 0, ImGuiCol.COUNT - 1 do
                local name = ImGui.GetStyleColorName(i)
                if se.filter:PassFilter(name) then
                    ImGui.PushID(i)
                    if ImGui.DebugFlashStyleColor then
                        if ImGui.Button("?") then ImGui.DebugFlashStyleColor(i) end
                        ImGui.SetItemTooltip("Flash given color to identify places where it is used.")
                        ImGui.SameLine()
                    end
                    ImGui.ColorEdit4("##color", style.Colors[i], bit32.bor(CE.AlphaBar, se.alpha_flags))
                    if not ColorsEqual(style.Colors[i], ref.Colors[i]) then
                        ImGui.SameLine(0.0, style.ItemInnerSpacing.x); if ImGui.Button("Save") then ImVec4_Copy(ref.Colors[i], style.Colors[i]) end
                        ImGui.SameLine(0.0, style.ItemInnerSpacing.x); if ImGui.Button("Revert") then ImVec4_Copy(style.Colors[i], ref.Colors[i]) end
                    end
                    ImGui.SameLine(0.0, style.ItemInnerSpacing.x)
                    ImGui.TextUnformatted(name)
                    ImGui.PopID()
                end
            end
            ImGui.PopItemWidth()
            ImGui.EndChild()
            ImGui.EndTabItem()
        end

        if ImGui.BeginTabItem("Fonts") then
            if ImGui.ShowFontAtlas then ImGui.ShowFontAtlas(ImGui.GetIO().Fonts) else DemoNotPorted("ShowFontAtlas") end
            ImGui.EndTabItem()
        end

        if ImGui.BeginTabItem("Rendering") then
            _, style.AntiAliasedLines = ImGui.Checkbox("Anti-aliased lines", style.AntiAliasedLines)
            ImGui.SameLine()
            HelpMarker("When disabling anti-aliasing lines, you'll probably want to disable borders in your style as well.")
            ImGui.BeginDisabled(style.AntiAliasedLines == false)
            _, style.AntiAliasedLineEnds = ImGui.Checkbox("Anti-aliased line ends", style.AntiAliasedLineEnds)
            ImGui.EndDisabled()
            _, style.AntiAliasedFill = ImGui.Checkbox("Anti-aliased fill", style.AntiAliasedFill)
            local io = ImGui.GetIO()
            _, io.ConfigDebugDrawListDefaultsToStrokeLegacy = ImGui.Checkbox("Debug: DrawList Defaults to _StrokeLegacy", io.ConfigDebugDrawListDefaultsToStrokeLegacy == true)

            ImGui.PushItemWidth(ImGui.GetFontSize() * 8)
            -- [port] library still stores the pre-1.93 CurveTessellationTol (== MaxError * MaxError)
            local curve_err = ImGui.DragFloat("Curve Tessellation Max Error", math.sqrt(style.CurveTessellationTol), 0.02, 0.10, 10.0, "%.2f")
            if curve_err < 0.10 then curve_err = 0.10 end
            style.CurveTessellationTol = curve_err * curve_err

            style.CircleTessellationMaxError = ImGui.DragFloat("Circle Tessellation Max Error", style.CircleTessellationMaxError, 0.005, 0.10, 5.0, "%.2f", ImGuiSliderFlags.AlwaysClamp)
            local show_samples = ImGui.IsItemActive()
            if show_samples then ImGui.SetNextWindowPos(ImGui.GetCursorScreenPos()) end
            if show_samples and ImGui.BeginTooltip() then
                ImGui.TextUnformatted("(R = radius, N = approx number of segments)")
                ImGui.Spacing()
                local draw_list = ImGui.GetWindowDrawList()
                local min_widget_width = ImGui.CalcTextSize("R: MMM\nN: MMM").x
                for n = 0, 7 do
                    local RAD_MIN, RAD_MAX = 5.0, 70.0
                    local rad = RAD_MIN + (RAD_MAX - RAD_MIN) * n / (8.0 - 1.0)
                    ImGui.BeginGroup()
                    ImGui.Text("R: %.f\nN: %d", rad, draw_list:_CalcCircleAutoSegmentCount(rad))
                    local canvas_width = math.max(min_widget_width, rad * 2.0)
                    local offset_x = math.floor(canvas_width * 0.5)
                    local offset_y = math.floor(RAD_MAX)
                    local p1 = ImGui.GetCursorScreenPos()
                    draw_list:AddCircle(ImVec2(p1.x + offset_x, p1.y + offset_y), rad, ImGui.GetColorU32(ImGuiCol.Text))
                    ImGui.Dummy(ImVec2(canvas_width, RAD_MAX * 2))
                    ImGui.EndGroup()
                    ImGui.SameLine()
                end
                ImGui.EndTooltip()
            end
            ImGui.SameLine()
            HelpMarker("When drawing circle primitives with \"num_segments == 0\" tessellation will be calculated automatically.")
            style.Alpha = ImGui.DragFloat("Global Alpha", style.Alpha, 0.005, 0.20, 1.0, "%.2f")
            style.DisabledAlpha = ImGui.DragFloat("Disabled Alpha", style.DisabledAlpha, 0.005, 0.0, 1.0, "%.2f")
            ImGui.SameLine(); HelpMarker("Additional alpha multiplier for disabled items (multiply over current value of Alpha).")
            ImGui.PopItemWidth()
            ImGui.EndTabItem()
        end
        ImGui.EndTabBar()
    end
    ImGui.PopItemWidth()
end

return true
end

__FILES['imgui_docking.lua'] = function()
--- ImGui Sincerely
-- Docking: 1:1 port of imgui.cpp [SECTION] DOCKING (docking branch, 1.93 WIP)
--
-- Port notes:
-- - Main viewport only (no multi-viewports on Roblox): viewport creation/merging code paths are kept where cheap, but
--   windows always live in the main viewport.
-- - ImGuiDockContext.Nodes (ImGuiStorage in C++) is a Lua table ID -> node. Iterations that upstream does over the
--   sorted storage are done over a sorted snapshot of the IDs (DockContextNodesSorted) for deterministic order.
-- - node.ChildNodes is a table indexed [0] and [1] like upstream.
-- - ImGuiDockPreviewData.DropRectsDraw is indexed [dir + 1] with dir in -1..3 (so keys 0..4), like upstream.

local MT = ImGui.GetMetatables()

IMGUI_PAYLOAD_TYPE_WINDOW = "_IMWINDOW"

local DOCKING_HOST_DRAW_CHANNEL_BG = 0 -- Dock host: background fill
local DOCKING_HOST_DRAW_CHANNEL_FG = 1 -- Dock host: decorations and contents

local DOCKING_SPLITTER_SIZE = 2.0

---------------------------------------------------------------------------------------
-- Docking: flags & enums
---------------------------------------------------------------------------------------

ImGuiDockNodeFlags = {
    None                         = 0,
    KeepAliveOnly                = bit32.lshift(1, 0),
    NoDockingOverCentralNode     = bit32.lshift(1, 2),
    PassthruCentralNode          = bit32.lshift(1, 3),
    NoDockingSplit               = bit32.lshift(1, 4),
    NoResize                     = bit32.lshift(1, 5),
    AutoHideTabBar               = bit32.lshift(1, 6),
    NoUndocking                  = bit32.lshift(1, 7),
    -- [Internal]
    DockSpace                    = bit32.lshift(1, 10),
    CentralNode                  = bit32.lshift(1, 11),
    NoTabBar                     = bit32.lshift(1, 12),
    HiddenTabBar                 = bit32.lshift(1, 13),
    NoWindowMenuButton           = bit32.lshift(1, 14),
    NoCloseButton                = bit32.lshift(1, 15),
    NoResizeX                    = bit32.lshift(1, 16),
    NoResizeY                    = bit32.lshift(1, 17),
    DockedWindowsInFocusRoute    = bit32.lshift(1, 18),
    NoDockingSplitOther          = bit32.lshift(1, 19),
    NoDockingOverMe              = bit32.lshift(1, 20),
    NoDockingOverOther           = bit32.lshift(1, 21),
    NoDockingOverEmpty           = bit32.lshift(1, 22),
}
do
    local F = ImGuiDockNodeFlags
    F.NoSplit = F.NoDockingSplit
    F.NoDockingInCentralNode = F.NoDockingOverCentralNode
    F.NoDocking = bit32.bor(F.NoDockingOverMe, F.NoDockingOverOther, F.NoDockingOverEmpty, F.NoDockingSplit, F.NoDockingSplitOther)
    F.SharedFlagsInheritMask_ = 0xFFFFFFFF
    F.NoResizeFlagsMask_ = bit32.bor(F.NoResize, F.NoResizeX, F.NoResizeY)
    F.LocalFlagsTransferMask_ = bit32.bor(F.NoDockingSplit, F.NoResizeFlagsMask_, F.AutoHideTabBar, F.CentralNode, F.NoTabBar, F.HiddenTabBar, F.NoWindowMenuButton, F.NoCloseButton)
    F.SavedFlagsMask_ = bit32.bor(F.NoResizeFlagsMask_, F.DockSpace, F.CentralNode, F.NoTabBar, F.HiddenTabBar, F.NoWindowMenuButton, F.NoCloseButton)
end

ImGuiDataAuthority = { Auto = 0, DockNode = 1, Window = 2 }

ImGuiDockNodeState = {
    Unknown = 0,
    HostWindowHiddenBecauseSingleWindow = 1,
    HostWindowHiddenBecauseWindowsAreResizing = 2,
    HostWindowVisible = 3,
}

ImGuiWindowDockStyleCol = {
    Text = 0, TabHovered = 1, TabFocused = 2, TabSelected = 3, TabSelectedOverline = 4,
    TabDimmed = 5, TabDimmedSelected = 6, TabDimmedSelectedOverline = 7, UnsavedMarker = 8, COUNT = 9,
}

local ImGuiDockRequestType = { None = 0, Dock = 1, Undock = 2, Split = 3 }

---------------------------------------------------------------------------------------
-- Docking: Internal Types
---------------------------------------------------------------------------------------

local function ImGuiDockRequest()
    return {
        Type = ImGuiDockRequestType.None,
        DockTargetWindow = nil, DockTargetNode = nil, DockPayload = nil,
        DockSplitDir = ImGuiDir.None, DockSplitRatio = 0.5, DockSplitOuter = false,
        UndockTargetWindow = nil, UndockTargetNode = nil,
    }
end

local function ImGuiDockNodeSettings()
    return {
        ID = 0, ParentNodeId = 0, ParentWindowId = 0, SelectedTabId = 0,
        SplitAxis = ImGuiAxis.None, Depth = 0, Flags = 0,
        Pos = ImVec2(0, 0), Size = ImVec2(0, 0), SizeRef = ImVec2(0, 0),
    }
end

function ImGuiDockContext()
    return { Nodes = {}, Requests = ImVector(), NodesSettings = ImVector(), WantFullRebuild = false }
end

MT.ImGuiDockNode = {}
MT.ImGuiDockNode.__index = MT.ImGuiDockNode
local DN = MT.ImGuiDockNode

function ImGuiDockNode(id)
    return setmetatable({
        ID = id,
        SharedFlags = 0, LocalFlags = 0, LocalFlagsInWindows = 0, MergedFlags = 0,
        State = ImGuiDockNodeState.Unknown,
        ParentNode = nil,
        ChildNodes = { [0] = nil, [1] = nil },
        Windows = ImVector(),
        TabBar = nil,
        Pos = ImVec2(0, 0), Size = ImVec2(0, 0), SizeRef = ImVec2(0, 0),
        SplitAxis = ImGuiAxis.None,
        LastBgColor = IM_COL32_WHITE,
        WindowClass = ImGuiWindowClass(),
        HostWindow = nil, VisibleWindow = nil,
        CentralNode = nil, OnlyNodeWithWindows = nil,
        CountNodeWithWindows = 0,
        LastFrameAlive = -1, LastFrameActive = -1, LastFrameFocused = -1,
        LastFocusedNodeId = 0, SelectedTabId = 0, WantCloseTabId = 0, RefViewportId = 0,
        AuthorityForPos = ImGuiDataAuthority.DockNode, AuthorityForSize = ImGuiDataAuthority.DockNode,
        AuthorityForViewport = ImGuiDataAuthority.Auto,
        IsVisible = true, IsFocused = false, IsBgDrawnThisFrame = false,
        HasCloseButton = false, HasWindowMenuButton = false, HasCentralNodeChild = false,
        WantCloseAll = false, WantLockSizeOnce = false, WantMouseMove = false,
        WantHiddenTabBarUpdate = false, WantHiddenTabBarToggle = false,
    }, DN)
end

function DN:IsRootNode()     return self.ParentNode == nil end
function DN:IsDockSpace()    return bit32.band(self.MergedFlags, ImGuiDockNodeFlags.DockSpace) ~= 0 end
function DN:IsFloatingNode() return self.ParentNode == nil and bit32.band(self.MergedFlags, ImGuiDockNodeFlags.DockSpace) == 0 end
function DN:IsCentralNode()  return bit32.band(self.MergedFlags, ImGuiDockNodeFlags.CentralNode) ~= 0 end
function DN:IsHiddenTabBar() return bit32.band(self.MergedFlags, ImGuiDockNodeFlags.HiddenTabBar) ~= 0 end
function DN:IsNoTabBar()     return bit32.band(self.MergedFlags, ImGuiDockNodeFlags.NoTabBar) ~= 0 end
function DN:IsSplitNode()    return self.ChildNodes[0] ~= nil end
function DN:IsLeafNode()     return self.ChildNodes[0] == nil end
function DN:IsEmpty()        return self.ChildNodes[0] == nil and self.Windows.Size == 0 end
function DN:Rect()           return ImRect(self.Pos.x, self.Pos.y, self.Pos.x + self.Size.x, self.Pos.y + self.Size.y) end
function DN:SetLocalFlags(flags) self.LocalFlags = flags; self:UpdateMergedFlags() end
function DN:UpdateMergedFlags() self.MergedFlags = bit32.bor(self.SharedFlags, self.LocalFlags, self.LocalFlagsInWindows) end

local function ImGuiDockPreviewData()
    local d = {
        FutureNode = ImGuiDockNode(0),
        IsDropAllowed = false, IsCenterAvailable = false, IsSidesAvailable = false, IsSplitDirExplicit = false,
        SplitNode = nil, SplitDir = ImGuiDir.None, SplitRatio = 0.0,
        DropRectsDraw = {},
    }
    for n = 0, 4 do d.DropRectsDraw[n] = ImRect(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX) end
    return d
end

local function DockNodeGetHostWindowTitle(node)
    return string.format("##DockNode_%02X", node.ID)
end

local function IsRectInverted(r) return r.Min.x > r.Max.x or r.Min.y > r.Max.y end

--- Sorted snapshot of node IDs (upstream iterates ImGuiStorage which is sorted by key)
local function DockContextNodesSorted(ctx)
    local ids = {}
    for id in pairs(ctx.DockContext.Nodes) do ids[#ids + 1] = id end
    table.sort(ids)
    return ids
end
ImGui.DockContextNodesSorted = DockContextNodesSorted

---------------------------------------------------------------------------------------
-- Docking: ImGuiDockContext
---------------------------------------------------------------------------------------

local DockSettingsHandler_ClearAll, DockSettingsHandler_ApplyAll, DockSettingsHandler_ReadOpen, DockSettingsHandler_ReadLine, DockSettingsHandler_WriteAll
local DockSettingsRenameNodeReferences, DockSettingsRemoveNodeReferences, DockSettingsFindNodeSettings

function ImGui.DockContextInitialize(ctx)
    local g = ctx
    local ini_handler = ImGuiSettingsHandler()
    ini_handler.TypeName = "Docking"
    ini_handler.TypeHash = ImHashStr("Docking")
    ini_handler.ClearAllFn = DockSettingsHandler_ClearAll
    ini_handler.ReadInitFn = DockSettingsHandler_ClearAll
    ini_handler.ReadOpenFn = DockSettingsHandler_ReadOpen
    ini_handler.ReadLineFn = DockSettingsHandler_ReadLine
    ini_handler.ApplyAllFn = DockSettingsHandler_ApplyAll
    ini_handler.WriteAllFn = DockSettingsHandler_WriteAll
    g.SettingsHandlers:push_back(ini_handler)

    g.DockNodeWindowMenuHandler = ImGui.DockNodeWindowMenuHandler_Default
end

function ImGui.DockContextShutdown(ctx)
    for _, id in ipairs(DockContextNodesSorted(ctx)) do
        local node = ctx.DockContext.Nodes[id]
        if node then ImGui.DockContextDeleteNode(ctx, node) end
    end
end

function ImGui.DockContextClearNodes(ctx, root_id, clear_settings_refs)
    ImGui.DockBuilderRemoveNodeDockedWindows(root_id, clear_settings_refs)
    ImGui.DockBuilderRemoveNodeChildNodes(root_id)
end

function ImGui.DockContextRebuildNodes(ctx)
    local dc = ctx.DockContext
    ImGui.SaveIniSettingsToMemory()
    local root_id = 0
    ImGui.DockContextClearNodes(ctx, root_id, false)
    ImGui.DockContextBuildNodesFromSettings(ctx, dc.NodesSettings.Data, dc.NodesSettings.Size)
    ImGui.DockContextBuildAddWindowsToNodes(ctx, root_id)
end

function ImGui.DockContextNewFrameUpdateUndocking(ctx)
    local g = ctx
    local dc = ctx.DockContext
    if bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.DockingEnable) == 0 then
        if next(dc.Nodes) ~= nil or dc.Requests.Size > 0 then
            ImGui.DockContextClearNodes(ctx, 0, true)
        end
        return
    end

    if g.IO.ConfigDockingNoSplit then
        for _, id in ipairs(DockContextNodesSorted(ctx)) do
            local node = dc.Nodes[id]
            if node and node:IsRootNode() and node:IsSplitNode() then
                ImGui.DockBuilderRemoveNodeChildNodes(node.ID)
            end
        end
    end

    if dc.WantFullRebuild then
        ImGui.DockContextRebuildNodes(ctx)
        dc.WantFullRebuild = false
    end

    for _, req in dc.Requests:iter() do
        if req.Type == ImGuiDockRequestType.Undock and req.UndockTargetWindow then
            ImGui.DockContextProcessUndockWindow(ctx, req.UndockTargetWindow)
        elseif req.Type == ImGuiDockRequestType.Undock and req.UndockTargetNode then
            ImGui.DockContextProcessUndockNode(ctx, req.UndockTargetNode)
        end
    end
end

function ImGui.DockContextNewFrameUpdateDocking(ctx)
    local g = ctx
    local dc = ctx.DockContext
    if bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.DockingEnable) == 0 then return end

    g.DebugHoveredDockNode = nil
    local hovered_window = g.HoveredWindowUnderMovingWindow
    if hovered_window then
        if hovered_window.DockNodeAsHost then
            g.DebugHoveredDockNode = ImGui.DockNodeTreeFindVisibleNodeByPos(hovered_window.DockNodeAsHost, g.IO.MousePos)
        elseif hovered_window.RootWindow.DockNode then
            g.DebugHoveredDockNode = hovered_window.RootWindow.DockNode
        end
    end

    for _, req in dc.Requests:iter() do
        if req.Type == ImGuiDockRequestType.Dock then
            ImGui.DockContextProcessDock(ctx, req)
        end
    end
    dc.Requests:resize(0)

    for _, id in ipairs(DockContextNodesSorted(ctx)) do
        local node = dc.Nodes[id]
        if node and node:IsFloatingNode() then
            ImGui.DockNodeUpdate(node)
        end
    end
end

function ImGui.DockContextEndFrame(ctx)
    local g = ctx
    local dc = g.DockContext
    for _, id in ipairs(DockContextNodesSorted(ctx)) do
        local node = dc.Nodes[id]
        if node and node.LastFrameActive == g.FrameCount and node.IsVisible and node.HostWindow and node:IsLeafNode() and not node.IsBgDrawnThisFrame then
            local bg_rect = ImRect(node.Pos + ImVec2(0.0, ImGui.GetFrameHeight()), node.Pos + node.Size)
            local bg_rounding_flags = ImGui.CalcRoundingFlagsForRectInRect(bg_rect, node.HostWindow:Rect(), g.Style.DockingSeparatorSize)
            node.HostWindow.DrawList:ChannelsSetCurrent(DOCKING_HOST_DRAW_CHANNEL_BG)
            node.HostWindow.DrawList:AddRectFilled(bg_rect.Min, bg_rect.Max, node.LastBgColor, node.HostWindow.WindowRounding, bg_rounding_flags)
        end
    end
end

function ImGui.DockContextFindNodeByID(ctx, id)
    return ctx.DockContext.Nodes[id]
end

function ImGui.DockContextGenNodeID(ctx)
    local id = 0x0001
    while ImGui.DockContextFindNodeByID(ctx, id) ~= nil do id = id + 1 end
    return id
end

function ImGui.DockContextAddNode(ctx, id)
    if id == 0 then
        id = ImGui.DockContextGenNodeID(ctx)
    else
        IM_ASSERT(ImGui.DockContextFindNodeByID(ctx, id) == nil)
    end
    local node = ImGuiDockNode(id)
    ctx.DockContext.Nodes[node.ID] = node
    return node
end

function ImGui.DockContextRemoveNode(ctx, node, merge_sibling_into_parent_node)
    IM_ASSERT(ImGui.DockContextFindNodeByID(ctx, node.ID) == node)
    IM_ASSERT(node.ChildNodes[0] == nil and node.ChildNodes[1] == nil)
    IM_ASSERT(node.Windows.Size == 0)

    if node.HostWindow then node.HostWindow.DockNodeAsHost = nil end

    local parent_node = node.ParentNode
    local merge = (merge_sibling_into_parent_node and parent_node ~= nil)
    if merge then
        IM_ASSERT(parent_node.ChildNodes[0] == node or parent_node.ChildNodes[1] == node)
        local sibling_node = (parent_node.ChildNodes[0] == node) and parent_node.ChildNodes[1] or parent_node.ChildNodes[0]
        ImGui.DockNodeTreeMerge(ctx, parent_node, sibling_node)
    else
        if parent_node then
            for n = 0, 1 do
                if parent_node.ChildNodes[n] == node then node.ParentNode.ChildNodes[n] = nil end
            end
        end
        ImGui.DockContextDeleteNode(ctx, node)
    end
end

function ImGui.DockContextDeleteNode(ctx, node)
    local dc = ctx.DockContext
    node.TabBar = nil
    dc.Nodes[node.ID] = nil
end

function ImGui.DockContextPruneUnusedSettingsNodes(ctx)
    local g = ctx
    local dc = ctx.DockContext
    IM_ASSERT(g.Windows.Size == 0)

    local pool = {}
    local function GetOrAdd(id)
        local d = pool[id]
        if not d then d = { CountWindows = 0, CountChildWindows = 0, CountChildNodes = 0, RootId = 0 }; pool[id] = d end
        return d
    end

    for _, settings in dc.NodesSettings:iter() do
        if pool[settings.ID] ~= nil then
            settings.ID = 0
        else
            local parent_data = (settings.ParentNodeId ~= 0) and pool[settings.ParentNodeId] or nil
            GetOrAdd(settings.ID).RootId = parent_data and parent_data.RootId or settings.ID
            if settings.ParentNodeId ~= 0 then
                local p = GetOrAdd(settings.ParentNodeId)
                p.CountChildNodes = p.CountChildNodes + 1
            end
        end
    end

    for _, settings in dc.NodesSettings:iter() do
        if settings.ParentWindowId ~= 0 then
            local window_settings = ImGui.FindWindowSettingsByID(settings.ParentWindowId)
            if window_settings and window_settings.DockId ~= 0 then
                local data = pool[window_settings.DockId]
                if data then data.CountChildNodes = data.CountChildNodes + 1 end
            end
        end
    end

    for _, settings in g.SettingsWindows:iter() do
        local dock_id = settings.DockId
        if dock_id and dock_id ~= 0 then
            local data = pool[dock_id]
            if data then
                data.CountWindows = data.CountWindows + 1
                local data_root = (data.RootId == dock_id) and data or pool[data.RootId]
                if data_root then data_root.CountChildWindows = data_root.CountChildWindows + 1 end
            end
        end
    end

    for _, settings in dc.NodesSettings:iter() do
        local data = pool[settings.ID]
        if data ~= nil and data.CountWindows <= 1 then
            local data_root = (settings.ID == data.RootId) and data or pool[data.RootId]
            local data_parent = (settings.ParentNodeId ~= 0) and pool[settings.ParentNodeId] or nil

            local remove = false
            remove = remove or (data.CountWindows == 1 and settings.ParentNodeId == 0 and data.CountChildNodes == 0 and bit32.band(settings.Flags, ImGuiDockNodeFlags.CentralNode) == 0)
            remove = remove or (data.CountWindows == 0 and settings.ParentNodeId == 0 and data.CountChildNodes == 0)
            remove = remove or (data_root == nil or data_root.CountChildWindows == 0)
            if remove then
                DockSettingsRemoveNodeReferences({ settings.ID }, 1)
                settings.ID = 0
            elseif data_parent and data_parent.CountChildNodes == 1 then
                DockSettingsRenameNodeReferences(settings.ID, settings.ParentNodeId)
                settings.ID = 0
            end
        end
    end
end

--- @param node_settings_array table # 1-based array
function ImGui.DockContextBuildNodesFromSettings(ctx, node_settings_array, node_settings_count)
    for node_n = 1, node_settings_count do
        local settings = node_settings_array[node_n]
        if settings.ID ~= 0 and ImGui.DockContextFindNodeByID(ctx, settings.ID) == nil then
            local node = ImGui.DockContextAddNode(ctx, settings.ID)
            node.ParentNode = (settings.ParentNodeId ~= 0) and ImGui.DockContextFindNodeByID(ctx, settings.ParentNodeId) or nil
            node.Pos = ImVec2(settings.Pos.x, settings.Pos.y)
            node.Size = ImVec2(settings.Size.x, settings.Size.y)
            node.SizeRef = ImVec2(settings.SizeRef.x, settings.SizeRef.y)
            node.AuthorityForPos = ImGuiDataAuthority.DockNode
            node.AuthorityForSize = ImGuiDataAuthority.DockNode
            node.AuthorityForViewport = ImGuiDataAuthority.DockNode
            if node.ParentNode and node.ParentNode.ChildNodes[0] == nil then
                node.ParentNode.ChildNodes[0] = node
            elseif node.ParentNode and node.ParentNode.ChildNodes[1] == nil then
                node.ParentNode.ChildNodes[1] = node
            end
            node.SelectedTabId = settings.SelectedTabId
            node.SplitAxis = settings.SplitAxis
            node:SetLocalFlags(bit32.band(settings.Flags, ImGuiDockNodeFlags.SavedFlagsMask_))

            local root_node = ImGui.DockNodeGetRootNode(node)
            node.HostWindow = ImGui.FindWindowByName(DockNodeGetHostWindowTitle(root_node))
        end
    end
end

function ImGui.DockContextBuildAddWindowsToNodes(ctx, root_id)
    local g = ctx
    for _, window in g.Windows:iter() do
        if window.DockId ~= 0 and window.LastFrameActive >= g.FrameCount - 1 and window.DockNode == nil then
            local node = ImGui.DockContextFindNodeByID(ctx, window.DockId)
            IM_ASSERT(node ~= nil)
            if root_id == 0 or ImGui.DockNodeGetRootNode(node).ID == root_id then
                ImGui.DockNodeAddWindow(node, window, true)
            end
        end
    end
end

---------------------------------------------------------------------------------------
-- Docking: ImGuiDockContext Docking/Undocking functions
---------------------------------------------------------------------------------------

function ImGui.DockContextQueueDock(ctx, target, target_node, payload, split_dir, split_ratio, split_outer)
    IM_ASSERT(target ~= payload)
    local req = ImGuiDockRequest()
    req.Type = ImGuiDockRequestType.Dock
    req.DockTargetWindow = target
    req.DockTargetNode = target_node
    req.DockPayload = payload
    req.DockSplitDir = split_dir
    req.DockSplitRatio = split_ratio
    req.DockSplitOuter = split_outer
    ctx.DockContext.Requests:push_back(req)
end

function ImGui.DockContextQueueUndockWindow(ctx, window)
    local req = ImGuiDockRequest()
    req.Type = ImGuiDockRequestType.Undock
    req.UndockTargetWindow = window
    ctx.DockContext.Requests:push_back(req)
end

function ImGui.DockContextQueueUndockNode(ctx, node)
    local req = ImGuiDockRequest()
    req.Type = ImGuiDockRequestType.Undock
    req.UndockTargetNode = node
    ctx.DockContext.Requests:push_back(req)
end

function ImGui.DockContextQueueNotifyRemovedNode(ctx, node)
    for _, req in ctx.DockContext.Requests:iter() do
        if req.DockTargetNode == node then req.Type = ImGuiDockRequestType.None end
    end
end

function ImGui.DockContextProcessDock(ctx, req)
    IM_ASSERT((req.Type == ImGuiDockRequestType.Dock and req.DockPayload ~= nil) or (req.Type == ImGuiDockRequestType.Split and req.DockPayload == nil))
    IM_ASSERT(req.DockTargetWindow ~= nil or req.DockTargetNode ~= nil)
    local g = ctx

    local payload_window = req.DockPayload
    local target_window = req.DockTargetWindow
    local node = req.DockTargetNode

    local next_selected_id = 0
    local payload_node = nil
    if payload_window then
        payload_node = payload_window.DockNodeAsHost
        payload_window.DockNodeAsHost = nil
        if payload_node and payload_node:IsLeafNode() then
            next_selected_id = (payload_node.TabBar.NextSelectedTabId ~= 0) and payload_node.TabBar.NextSelectedTabId or payload_node.TabBar.SelectedTabId
        end
        if payload_node == nil then next_selected_id = payload_window.TabId end
    end

    if node then IM_ASSERT(node.LastFrameAlive <= g.FrameCount) end
    if node and target_window and node == target_window.DockNodeAsHost then
        IM_ASSERT(node.Windows.Size > 0 or node:IsSplitNode() or node:IsCentralNode())
    end

    if node == nil then
        node = ImGui.DockContextAddNode(ctx, 0)
        node.Pos = ImVec2(target_window.Pos.x, target_window.Pos.y)
        node.Size = ImVec2(target_window.Size.x, target_window.Size.y)
        if target_window.DockNodeAsHost == nil then
            ImGui.DockNodeAddWindow(node, target_window, true)
            local t0 = node.TabBar.Tabs.Data[1]
            t0.Flags = bit32.band(t0.Flags, bit32.bnot(ImGuiTabItemFlags.Unsorted))
            target_window.DockIsActive = true
        end
    end

    local split_dir = req.DockSplitDir
    if split_dir ~= ImGuiDir.None then
        local split_axis = (split_dir == ImGuiDir.Left or split_dir == ImGuiDir.Right) and ImGuiAxis.X or ImGuiAxis.Y
        local split_inheritor_child_idx = (split_dir == ImGuiDir.Left or split_dir == ImGuiDir.Up) and 1 or 0
        local split_ratio = req.DockSplitRatio
        ImGui.DockNodeTreeSplit(ctx, node, split_axis, split_inheritor_child_idx, split_ratio, payload_node)
        local new_node = node.ChildNodes[bit32.bxor(split_inheritor_child_idx, 1)]
        new_node.HostWindow = node.HostWindow
        node = new_node
    end
    node:SetLocalFlags(bit32.band(node.LocalFlags, bit32.bnot(ImGuiDockNodeFlags.HiddenTabBar)))

    if node ~= payload_node then
        if node.Windows.Size > 0 and node.TabBar == nil then
            ImGui.DockNodeAddTabBar(node)
            for n = 1, node.Windows.Size do
                ImGui.TabBarAddTab(node.TabBar, ImGuiTabItemFlags.None, node.Windows.Data[n])
            end
        end

        if payload_node ~= nil then
            if payload_node:IsSplitNode() then
                if node.Windows.Size > 0 then
                    IM_ASSERT(payload_node.OnlyNodeWithWindows ~= nil)
                    local visible_node = payload_node.OnlyNodeWithWindows
                    if visible_node.TabBar then IM_ASSERT(visible_node.TabBar.Tabs.Size > 0) end
                    ImGui.DockNodeMoveWindows(node, visible_node)
                    ImGui.DockNodeMoveWindows(visible_node, node)
                    DockSettingsRenameNodeReferences(node.ID, visible_node.ID)
                end
                if node:IsCentralNode() then
                    local last_focused_node = ImGui.DockContextFindNodeByID(ctx, payload_node.LastFocusedNodeId)
                    IM_ASSERT(last_focused_node ~= nil)
                    local last_focused_root_node = ImGui.DockNodeGetRootNode(last_focused_node)
                    IM_ASSERT(last_focused_root_node == ImGui.DockNodeGetRootNode(payload_node))
                    last_focused_node:SetLocalFlags(bit32.bor(last_focused_node.LocalFlags, ImGuiDockNodeFlags.CentralNode))
                    node:SetLocalFlags(bit32.band(node.LocalFlags, bit32.bnot(ImGuiDockNodeFlags.CentralNode)))
                    last_focused_root_node.CentralNode = last_focused_node
                end

                IM_ASSERT(node.Windows.Size == 0)
                ImGui.DockNodeMoveChildNodes(node, payload_node)
            else
                local payload_dock_id = payload_node.ID
                ImGui.DockNodeMoveWindows(node, payload_node)
                DockSettingsRenameNodeReferences(payload_dock_id, node.ID)
            end
            ImGui.DockContextRemoveNode(ctx, payload_node, true)
        elseif payload_window then
            local payload_dock_id = payload_window.DockId
            node.VisibleWindow = payload_window
            ImGui.DockNodeAddWindow(node, payload_window, true)
            if payload_dock_id ~= 0 then
                DockSettingsRenameNodeReferences(payload_dock_id, node.ID)
            end
        end
    else
        node.WantHiddenTabBarUpdate = true
    end

    local tab_bar = node.TabBar
    if tab_bar then tab_bar.NextSelectedTabId = next_selected_id end
    ImGui.MarkIniSettingsDirty()
end

local function FixLargeWindowsWhenUndocking(size, ref_viewport)
    if ref_viewport == nil then return size end
    local max_size = ImTrunc(ref_viewport.WorkSize * 0.90)
    return ImVec2(ImMin(size.x, max_size.x), ImMin(size.y, max_size.y))
end

function ImGui.DockContextProcessUndockWindow(ctx, window, clear_persistent_docking_ref)
    if clear_persistent_docking_ref == nil then clear_persistent_docking_ref = true end -- C++ default argument
    if window.DockNode then
        ImGui.DockNodeRemoveWindow(window.DockNode, window, clear_persistent_docking_ref and 0 or window.DockId)
    else
        window.DockId = 0
    end
    window.Collapsed = false
    window.DockIsActive = false
    window.DockNodeIsVisible = false
    window.DockTabIsVisible = false
    local sz = FixLargeWindowsWhenUndocking(window.SizeFull, window.Viewport)
    ImVec2_Copy(window.Size, sz)
    ImVec2_Copy(window.SizeFull, sz)
    ImGui.MarkIniSettingsDirty()
end

function ImGui.DockContextProcessUndockNode(ctx, node)
    IM_ASSERT(node:IsLeafNode())
    IM_ASSERT(node.Windows.Size >= 1)

    if node:IsRootNode() or node:IsCentralNode() then
        local new_node = ImGui.DockContextAddNode(ctx, 0)
        new_node.Pos = ImVec2(node.Pos.x, node.Pos.y)
        new_node.Size = ImVec2(node.Size.x, node.Size.y)
        new_node.SizeRef = ImVec2(node.SizeRef.x, node.SizeRef.y)
        ImGui.DockNodeMoveWindows(new_node, node)
        DockSettingsRenameNodeReferences(node.ID, new_node.ID)
        node = new_node
    else
        IM_ASSERT(node.ParentNode.ChildNodes[0] == node or node.ParentNode.ChildNodes[1] == node)
        local index_in_parent = (node.ParentNode.ChildNodes[0] == node) and 0 or 1
        node.ParentNode.ChildNodes[index_in_parent] = nil
        ImGui.DockNodeTreeMerge(ctx, node.ParentNode, node.ParentNode.ChildNodes[bit32.bxor(index_in_parent, 1)])
        node.ParentNode.AuthorityForViewport = ImGuiDataAuthority.Window
        node.ParentNode = nil
    end
    for _, window in node.Windows:iter() do
        window.Flags = bit32.band(window.Flags, bit32.bnot(ImGuiWindowFlags.ChildWindow))
        if window.ParentWindow then window.ParentWindow.DC.ChildWindows:find_erase(window) end
        ImGui.UpdateWindowParentAndRootLinks(window, window.Flags, nil)
    end
    node.AuthorityForPos = ImGuiDataAuthority.DockNode
    node.AuthorityForSize = ImGuiDataAuthority.DockNode
    node.Size = FixLargeWindowsWhenUndocking(node.Size, node.Windows.Data[1].Viewport)
    node.WantMouseMove = true
    ImGui.MarkIniSettingsDirty()
end

--- @return bool ok, ImVec2? out_pos
function ImGui.DockContextCalcDropPosForDocking(target, target_node, payload_window, payload_node, split_dir, split_outer)
    if target ~= nil and target_node == nil then target_node = target.DockNode end
    if target_node and target_node.ParentNode == nil and target_node:IsCentralNode() and split_dir ~= ImGuiDir.None then
        split_outer = true
    end
    local split_data = ImGuiDockPreviewData()
    ImGui.DockNodePreviewDockSetup(target, target_node, payload_window, payload_node, split_data, false, split_outer)
    local r = split_data.DropRectsDraw[split_dir + 1]
    if IsRectInverted(r) then return false, nil end
    return true, r:GetCenter()
end

---------------------------------------------------------------------------------------
-- Docking: ImGuiDockNode
---------------------------------------------------------------------------------------

function ImGui.DockNodeGetTabOrder(window)
    local tab_bar = window.DockNode.TabBar
    if tab_bar == nil then return -1 end
    local tab = ImGui.TabBarFindTabByID(tab_bar, window.TabId)
    return tab and ImGui.TabBarGetTabOrder(tab_bar, tab) or -1
end

local function DockNodeHideWindowDuringHostWindowCreation(window)
    window.Hidden = true
    window.HiddenFramesCanSkipItems = window.Active and 1 or 2
end

function ImGui.DockNodeAddWindow(node, window, add_to_tab_bar)
    if window.DockNode then
        IM_ASSERT(window.DockNode.ID ~= node.ID)
        ImGui.DockNodeRemoveWindow(window.DockNode, window, 0)
    end
    IM_ASSERT(window.DockNode == nil or window.DockNodeAsHost == nil)

    if node.HostWindow == nil and node.Windows.Size == 1 and node.Windows.Data[1].WasActive == false then
        DockNodeHideWindowDuringHostWindowCreation(node.Windows.Data[1])
    end

    node.Windows:push_back(window)
    node.WantHiddenTabBarUpdate = true
    window.DockNode = node
    window.DockId = node.ID
    window.DockIsActive = (node.Windows.Size > 1)
    window.DockTabWantClose = false

    if node.HostWindow == nil and node:IsFloatingNode() then
        if node.AuthorityForPos == ImGuiDataAuthority.Auto then node.AuthorityForPos = ImGuiDataAuthority.Window end
        if node.AuthorityForSize == ImGuiDataAuthority.Auto then node.AuthorityForSize = ImGuiDataAuthority.Window end
        if node.AuthorityForViewport == ImGuiDataAuthority.Auto then node.AuthorityForViewport = ImGuiDataAuthority.Window end
    end

    if add_to_tab_bar then
        if node.TabBar == nil then
            ImGui.DockNodeAddTabBar(node)
            node.TabBar.SelectedTabId = node.SelectedTabId
            node.TabBar.NextSelectedTabId = node.SelectedTabId
            for n = 1, node.Windows.Size - 1 do
                ImGui.TabBarAddTab(node.TabBar, ImGuiTabItemFlags.None, node.Windows.Data[n])
            end
        end
        ImGui.TabBarAddTab(node.TabBar, ImGuiTabItemFlags.Unsorted, window)
    end

    ImGui.DockNodeUpdateVisibleFlag(node)

    if node.HostWindow then
        ImGui.UpdateWindowParentAndRootLinks(window, bit32.bor(window.Flags, ImGuiWindowFlags.ChildWindow), node.HostWindow)
    end
end

function ImGui.DockNodeRemoveWindow(node, window, save_dock_id)
    IM_ASSERT(window.DockNode == node)
    IM_ASSERT(save_dock_id == 0 or save_dock_id == node.ID)

    window.DockNode = nil
    window.DockIsActive = false
    window.DockTabWantClose = false
    window.DockId = save_dock_id
    window.Flags = bit32.band(window.Flags, bit32.bnot(ImGuiWindowFlags.ChildWindow))
    if window.ParentWindow then window.ParentWindow.DC.ChildWindows:find_erase(window) end
    ImGui.UpdateWindowParentAndRootLinks(window, window.Flags, nil)

    if node.HostWindow and node.HostWindow.ViewportOwned then
        window.Viewport = nil
        window.ViewportId = 0
        window.ViewportOwned = false
        window.Hidden = true
    end

    local idx = node.Windows:find_index(window)
    IM_ASSERT(idx ~= nil)
    node.Windows:erase(idx)
    if node.VisibleWindow == window then node.VisibleWindow = nil end

    node.WantHiddenTabBarUpdate = true
    if node.TabBar then
        ImGui.TabBarRemoveTab(node.TabBar, window.TabId)
        local tab_count_threshold_for_tab_bar = node:IsCentralNode() and 1 or 2
        if node.Windows.Size < tab_count_threshold_for_tab_bar then
            ImGui.DockNodeRemoveTabBar(node)
        end
    end
    if node.Windows.Size == 0 and not node:IsCentralNode() and not node:IsDockSpace() and window.DockId ~= node.ID then
        ImGui.DockContextRemoveNode(ImGui.GetCurrentContext(), node, true)
        return
    end

    if node.Windows.Size == 1 and not node:IsCentralNode() and node.HostWindow then
        local remaining_window = node.Windows.Data[1]
        remaining_window.Collapsed = node.HostWindow.Collapsed
    end

    ImGui.DockNodeUpdateVisibleFlag(node)
end

function ImGui.DockNodeMoveChildNodes(dst_node, src_node)
    IM_ASSERT(dst_node.Windows.Size == 0)
    dst_node.ChildNodes[0] = src_node.ChildNodes[0]
    dst_node.ChildNodes[1] = src_node.ChildNodes[1]
    if dst_node.ChildNodes[0] then dst_node.ChildNodes[0].ParentNode = dst_node end
    if dst_node.ChildNodes[1] then dst_node.ChildNodes[1].ParentNode = dst_node end
    dst_node.SplitAxis = src_node.SplitAxis
    dst_node.SizeRef = ImVec2(src_node.SizeRef.x, src_node.SizeRef.y)
    src_node.ChildNodes[0] = nil
    src_node.ChildNodes[1] = nil
end

function ImGui.DockNodeMoveWindows(dst_node, src_node)
    IM_ASSERT(src_node and dst_node and dst_node ~= src_node)
    local src_tab_bar = src_node.TabBar
    if src_tab_bar ~= nil then IM_ASSERT(src_node.Windows.Size <= src_node.TabBar.Tabs.Size) end

    local move_tab_bar = (src_tab_bar ~= nil) and (dst_node.TabBar == nil)
    if move_tab_bar then
        dst_node.TabBar = src_node.TabBar
        src_node.TabBar = nil
    end

    -- Snapshot: DockNodeAddWindow() won't touch src_node.Windows since window.DockNode is cleared first
    local windows = {}
    for i = 1, src_node.Windows.Size do windows[i] = src_node.Windows.Data[i] end
    for _, window in ipairs(windows) do
        window.DockNode = nil
        window.DockIsActive = false
        ImGui.DockNodeAddWindow(dst_node, window, not move_tab_bar)
    end
    src_node.Windows:clear()

    if not move_tab_bar and src_node.TabBar then
        if dst_node.TabBar then dst_node.TabBar.SelectedTabId = src_node.TabBar.SelectedTabId end
        ImGui.DockNodeRemoveTabBar(src_node)
    end
end

function ImGui.DockNodeApplyPosSizeToWindows(node)
    for _, window in node.Windows:iter() do
        ImGui.SetWindowPos(window, node.Pos, ImGuiCond.Always)
        ImGui.SetWindowSize(window, node.Size, ImGuiCond.Always)
    end
end

function ImGui.DockNodeHideHostWindow(node)
    if node.HostWindow then
        if node.HostWindow.DockNodeAsHost == node then node.HostWindow.DockNodeAsHost = nil end
        node.HostWindow = nil
    end
    if node.Windows.Size == 1 then
        node.VisibleWindow = node.Windows.Data[1]
        node.Windows.Data[1].DockIsActive = false
    end
    if node.TabBar then ImGui.DockNodeRemoveTabBar(node) end
end

local function DockNodeFindInfo(node, info)
    if node.Windows.Size > 0 then
        if info.FirstNodeWithWindows == nil then info.FirstNodeWithWindows = node end
        info.CountNodesWithWindows = info.CountNodesWithWindows + 1
    end
    if node:IsCentralNode() then
        IM_ASSERT(info.CentralNode == nil)
        IM_ASSERT(node:IsLeafNode(), "If you get this assert: please submit .ini file + repro of actions leading to this.")
        info.CentralNode = node
    end
    if info.CountNodesWithWindows > 1 and info.CentralNode ~= nil then return end
    if node.ChildNodes[0] then DockNodeFindInfo(node.ChildNodes[0], info) end
    if node.ChildNodes[1] then DockNodeFindInfo(node.ChildNodes[1], info) end
end

function ImGui.DockNodeFindWindowByID(node, id)
    IM_ASSERT(id ~= 0)
    for _, window in node.Windows:iter() do
        if window.ID == id then return window end
    end
    return nil
end

function ImGui.DockNodeUpdateFlagsAndCollapse(node)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(node.ParentNode == nil or node.ParentNode.ChildNodes[0] == node or node.ParentNode.ChildNodes[1] == node)

    if node.ParentNode then
        node.SharedFlags = bit32.band(node.ParentNode.SharedFlags, ImGuiDockNodeFlags.SharedFlagsInheritMask_)
    end

    node.HasCentralNodeChild = false
    if node.ChildNodes[0] then ImGui.DockNodeUpdateFlagsAndCollapse(node.ChildNodes[0]) end
    if node.ChildNodes[1] then ImGui.DockNodeUpdateFlagsAndCollapse(node.ChildNodes[1]) end

    node.LocalFlagsInWindows = ImGuiDockNodeFlags.None
    local window_n = 1
    while window_n <= node.Windows.Size do
        local window = node.Windows.Data[window_n]
        IM_ASSERT(window.DockNode == node)

        local node_was_active = (node.LastFrameActive + 1 == g.FrameCount)
        local remove = false
        remove = remove or (node_was_active and (window.WasActive == false))
        remove = remove or (node_was_active and (node.WantCloseAll or node.WantCloseTabId == window.TabId) and window.HasCloseButton and bit32.band(window.Flags, ImGuiWindowFlags.UnsavedDocument) == 0)
        remove = remove or window.DockTabWantClose
        if remove then
            window.DockTabWantClose = false
            if node.Windows.Size == 1 and not node:IsCentralNode() then
                ImGui.DockNodeHideHostWindow(node)
                node.State = ImGuiDockNodeState.HostWindowHiddenBecauseSingleWindow
                ImGui.DockNodeRemoveWindow(node, window, node.ID)
                return
            end
            ImGui.DockNodeRemoveWindow(node, window, node.ID)
        else
            node.LocalFlagsInWindows = bit32.bor(node.LocalFlagsInWindows, window.WindowClass.DockNodeFlagsOverrideSet)
            window_n = window_n + 1
        end
    end
    node:UpdateMergedFlags()

    local node_flags = node.MergedFlags
    if node.WantHiddenTabBarUpdate and node.Windows.Size == 1 and bit32.band(node_flags, ImGuiDockNodeFlags.AutoHideTabBar) ~= 0 and not node:IsHiddenTabBar() then
        node.WantHiddenTabBarToggle = true
    end
    node.WantHiddenTabBarUpdate = false

    if node.WantHiddenTabBarToggle and node.VisibleWindow and bit32.band(node.VisibleWindow.WindowClass.DockNodeFlagsOverrideSet, ImGuiDockNodeFlags.HiddenTabBar) ~= 0 then
        node.WantHiddenTabBarToggle = false
    end

    local prev_local_flags = node.LocalFlags
    if node.Windows.Size > 1 then
        node:SetLocalFlags(bit32.band(node.LocalFlags, bit32.bnot(ImGuiDockNodeFlags.HiddenTabBar)))
    elseif node.WantHiddenTabBarToggle then
        node:SetLocalFlags(bit32.bxor(node.LocalFlags, ImGuiDockNodeFlags.HiddenTabBar))
    end
    if bit32.band(bit32.bxor(node.LocalFlags, prev_local_flags), ImGuiDockNodeFlags.SavedFlagsMask_) ~= 0 then
        ImGui.MarkIniSettingsDirty()
    end
    node.WantHiddenTabBarToggle = false

    ImGui.DockNodeUpdateVisibleFlag(node)
end

function ImGui.DockNodeUpdateHasCentralNodeChild(node)
    node.HasCentralNodeChild = false
    if node.ChildNodes[0] then ImGui.DockNodeUpdateHasCentralNodeChild(node.ChildNodes[0]) end
    if node.ChildNodes[1] then ImGui.DockNodeUpdateHasCentralNodeChild(node.ChildNodes[1]) end
    if node:IsRootNode() then
        local mark_node = node.CentralNode
        while mark_node do
            mark_node.HasCentralNodeChild = true
            mark_node = mark_node.ParentNode
        end
    end
end

function ImGui.DockNodeUpdateVisibleFlag(node)
    local is_visible = (node.ParentNode == nil) and node:IsDockSpace() or node:IsCentralNode()
    is_visible = is_visible or (node.Windows.Size > 0)
    is_visible = is_visible or (node.ChildNodes[0] ~= nil and node.ChildNodes[0].IsVisible)
    is_visible = is_visible or (node.ChildNodes[1] ~= nil and node.ChildNodes[1].IsVisible)
    node.IsVisible = is_visible and true or false
end

function ImGui.DockNodeStartMouseMovingWindow(node, window)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(node.WantMouseMove == true)
    ImGui.StartMouseMovingWindow(window)
    ImVec2_Copy(g.ActiveIdClickOffset, g.IO.MouseClickedPos[0] - node.Pos)
    g.MovingWindow = window
    node.WantMouseMove = false
end

function ImGui.DockNodeUpdateForRootNode(node)
    ImGui.DockNodeUpdateFlagsAndCollapse(node)

    local info = { CentralNode = nil, FirstNodeWithWindows = nil, CountNodesWithWindows = 0 }
    DockNodeFindInfo(node, info)
    node.CentralNode = info.CentralNode
    node.OnlyNodeWithWindows = (info.CountNodesWithWindows == 1) and info.FirstNodeWithWindows or nil
    node.CountNodeWithWindows = info.CountNodesWithWindows
    if node.LastFocusedNodeId == 0 and info.FirstNodeWithWindows ~= nil then
        node.LastFocusedNodeId = info.FirstNodeWithWindows.ID
    end

    local first_node_with_windows = info.FirstNodeWithWindows
    if first_node_with_windows then
        node.WindowClass = first_node_with_windows.Windows.Data[1].WindowClass
        for n = 2, first_node_with_windows.Windows.Size do
            if first_node_with_windows.Windows.Data[n].WindowClass.DockingAllowUnclassed == false then
                node.WindowClass = first_node_with_windows.Windows.Data[n].WindowClass
                break
            end
        end
    end

    local mark_node = node.CentralNode
    while mark_node do
        mark_node.HasCentralNodeChild = true
        mark_node = mark_node.ParentNode
    end
end

local function DockNodeSetupHostWindow(node, host_window)
    if node.HostWindow and node.HostWindow ~= host_window and node.HostWindow.DockNodeAsHost == node then
        node.HostWindow.DockNodeAsHost = nil
    end
    host_window.DockNodeAsHost = node
    node.HostWindow = host_window
end

function ImGui.DockNodeUpdate(node)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(node.LastFrameActive ~= g.FrameCount)
    node.LastFrameAlive = g.FrameCount
    node.IsBgDrawnThisFrame = false

    node.CentralNode = nil
    node.OnlyNodeWithWindows = nil
    if node:IsRootNode() then ImGui.DockNodeUpdateForRootNode(node) end

    if node.TabBar and node:IsNoTabBar() then ImGui.DockNodeRemoveTabBar(node) end

    local want_to_hide_host_window = false
    if node:IsFloatingNode() then
        if node.Windows.Size <= 1 and node:IsLeafNode() then
            if not g.IO.ConfigDockingAlwaysTabBar and (node.Windows.Size == 0 or not node.Windows.Data[1].WindowClass.DockingAlwaysTabBar) then
                want_to_hide_host_window = true
            end
        end
        if node.CountNodeWithWindows == 0 then want_to_hide_host_window = true end
    end
    if want_to_hide_host_window then
        if node.Windows.Size == 1 then
            local single_window = node.Windows.Data[1]
            node.Pos = ImVec2(single_window.Pos.x, single_window.Pos.y)
            node.Size = ImVec2(single_window.SizeFull.x, single_window.SizeFull.y)
            node.AuthorityForPos = ImGuiDataAuthority.Window
            node.AuthorityForSize = ImGuiDataAuthority.Window
            node.AuthorityForViewport = ImGuiDataAuthority.Window

            if node.HostWindow and g.NavWindow == node.HostWindow then
                ImGui.FocusWindow(single_window)
            end
            if node.HostWindow then
                single_window.Viewport = node.HostWindow.Viewport
                single_window.ViewportId = node.HostWindow.ViewportId
            end
            node.RefViewportId = single_window.ViewportId or 0
        end

        ImGui.DockNodeHideHostWindow(node)
        node.State = ImGuiDockNodeState.HostWindowHiddenBecauseSingleWindow
        node.WantCloseAll = false
        node.WantCloseTabId = 0
        node.HasCloseButton = false
        node.HasWindowMenuButton = false
        node.LastFrameActive = g.FrameCount

        if node.WantMouseMove and node.Windows.Size == 1 then
            ImGui.DockNodeStartMouseMovingWindow(node, node.Windows.Data[1])
        end
        return
    end

    if node.IsVisible and node.HostWindow == nil and node:IsFloatingNode() and node:IsLeafNode() then
        IM_ASSERT(node.Windows.Size > 0)
        local ref_window = nil
        if node.SelectedTabId ~= 0 then ref_window = ImGui.DockNodeFindWindowByID(node, node.SelectedTabId) end
        if ref_window == nil then ref_window = node.Windows.Data[1] end
        if ref_window.AutoFitFramesX > 0 or ref_window.AutoFitFramesY > 0 then
            node.State = ImGuiDockNodeState.HostWindowHiddenBecauseWindowsAreResizing
            return
        end
    end

    local node_flags = node.MergedFlags

    node.HasWindowMenuButton = (node.Windows.Size > 0) and bit32.band(node_flags, ImGuiDockNodeFlags.NoWindowMenuButton) == 0
    node.HasCloseButton = false
    for _, window in node.Windows:iter() do
        node.HasCloseButton = node.HasCloseButton or window.HasCloseButton
        window.DockIsActive = (node.Windows.Size > 1)
    end
    if bit32.band(node_flags, ImGuiDockNodeFlags.NoCloseButton) ~= 0 or not g.Style.DockingNodeHasCloseButton then
        node.HasCloseButton = false
    end

    local host_window = nil
    local beginned_into_host_window = false
    if node:IsDockSpace() then
        IM_ASSERT(node.HostWindow)
        host_window = node.HostWindow
    else
        if node:IsRootNode() and node.IsVisible then
            local ref_window = (node.Windows.Size > 0) and node.Windows.Data[1] or nil

            if node.AuthorityForPos == ImGuiDataAuthority.Window and ref_window then
                ImGui.SetNextWindowPos(ref_window.Pos)
            elseif node.AuthorityForPos == ImGuiDataAuthority.DockNode then
                ImGui.SetNextWindowPos(node.Pos)
            end

            if node.AuthorityForSize == ImGuiDataAuthority.Window and ref_window then
                ImGui.SetNextWindowSize(ref_window.SizeFull)
            elseif node.AuthorityForSize == ImGuiDataAuthority.DockNode then
                ImGui.SetNextWindowSize(node.Size)
            end

            if node.AuthorityForSize == ImGuiDataAuthority.Window and ref_window then
                ImGui.SetNextWindowCollapsed(ref_window.Collapsed)
            end

            ImGui.SetNextWindowClass(node.WindowClass)

            local window_label = DockNodeGetHostWindowTitle(node)
            local window_flags = bit32.bor(ImGuiWindowFlags.NoScrollbar, ImGuiWindowFlags.NoScrollWithMouse, ImGuiWindowFlags.DockNodeHost)
            window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoFocusOnAppearing)
            window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoSavedSettings, ImGuiWindowFlags.NoNavFocus, ImGuiWindowFlags.NoCollapse)
            window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoTitleBar)

            ImGui.SetNextWindowBgAlpha(0.0)
            ImGui.PushStyleVar(ImGuiStyleVar.WindowPadding, ImVec2(0, 0))
            ImGui.Begin(window_label, nil, window_flags)
            ImGui.PopStyleVar()
            beginned_into_host_window = true

            host_window = g.CurrentWindow
            DockNodeSetupHostWindow(node, host_window)
            ImVec2_Copy(host_window.DC.CursorPos, host_window.Pos)
            node.Pos = ImVec2(host_window.Pos.x, host_window.Pos.y)
            node.Size = ImVec2(host_window.Size.x, host_window.Size.y)

            if node.HostWindow.Appearing then ImGui.BringWindowToDisplayFront(node.HostWindow) end

            node.AuthorityForPos = ImGuiDataAuthority.Auto
            node.AuthorityForSize = ImGuiDataAuthority.Auto
            node.AuthorityForViewport = ImGuiDataAuthority.Auto
        elseif node.ParentNode then
            host_window = node.ParentNode.HostWindow
            node.HostWindow = host_window
            node.AuthorityForPos = ImGuiDataAuthority.Auto
            node.AuthorityForSize = ImGuiDataAuthority.Auto
            node.AuthorityForViewport = ImGuiDataAuthority.Auto
        end
        if node.WantMouseMove and node.HostWindow then
            ImGui.DockNodeStartMouseMovingWindow(node, node.HostWindow)
        end
    end
    node.RefViewportId = 0

    if node:IsSplitNode() then IM_ASSERT(node.TabBar == nil) end
    if node:IsRootNode() then
        local p_window = g.NavWindow and g.NavWindow.RootWindow or nil
        while p_window ~= nil and p_window.DockNode ~= nil do
            local p_node = ImGui.DockNodeGetRootNode(p_window.DockNode)
            if p_node == node then
                node.LastFocusedNodeId = p_window.DockNode.ID
                break
            end
            p_window = p_node.HostWindow and p_node.HostWindow.RootWindow or nil
        end
    end

    local central_node = node.CentralNode
    local central_node_hole = node:IsRootNode() and host_window ~= nil and bit32.band(node_flags, ImGuiDockNodeFlags.PassthruCentralNode) ~= 0 and central_node ~= nil and central_node:IsEmpty()
    local central_node_hole_register_hit_test_hole = central_node_hole
    if central_node_hole then
        local payload = ImGui.GetDragDropPayload()
        if payload and ImGuiPayload_IsDataType(payload, IMGUI_PAYLOAD_TYPE_WINDOW) and ImGui.DockNodeIsDropAllowed(host_window, payload.Data) then
            central_node_hole_register_hit_test_hole = false
        end
    end
    if central_node_hole_register_hit_test_hole then
        IM_ASSERT(node:IsDockSpace())
        local root_node = ImGui.DockNodeGetRootNode(central_node)
        local root_rect = ImRect(root_node.Pos, root_node.Pos + root_node.Size)
        local hole_rect = ImRect(central_node.Pos, central_node.Pos + central_node.Size)
        if hole_rect.Min.x > root_rect.Min.x then hole_rect.Min.x = hole_rect.Min.x + g.WindowsBorderHoverPadding end
        if hole_rect.Max.x < root_rect.Max.x then hole_rect.Max.x = hole_rect.Max.x - g.WindowsBorderHoverPadding end
        if hole_rect.Min.y > root_rect.Min.y then hole_rect.Min.y = hole_rect.Min.y + g.WindowsBorderHoverPadding end
        if hole_rect.Max.y < root_rect.Max.y then hole_rect.Max.y = hole_rect.Max.y - g.WindowsBorderHoverPadding end
        if central_node_hole and not IsRectInverted(hole_rect) then
            ImGui.SetWindowHitTestHole(host_window, hole_rect.Min, hole_rect.Max - hole_rect.Min)
            if host_window.ParentWindow then
                ImGui.SetWindowHitTestHole(host_window.ParentWindow, hole_rect.Min, hole_rect.Max - hole_rect.Min)
            end
        end
    end

    if node:IsRootNode() and host_window then
        ImGui.DockNodeTreeUpdatePosSize(node, host_window.Pos, host_window.Size)
        ImGui.PushStyleColor(ImGuiCol.Separator, g.Style.Colors[ImGuiCol.Border])
        ImGui.PushStyleColor(ImGuiCol.SeparatorActive, g.Style.Colors[ImGuiCol.ResizeGripActive])
        ImGui.PushStyleColor(ImGuiCol.SeparatorHovered, g.Style.Colors[ImGuiCol.ResizeGripHovered])
        ImGui.DockNodeTreeUpdateSplitter(node)
        ImGui.PopStyleColor(3)
    end

    if host_window and node:IsEmpty() and node.IsVisible then
        host_window.DrawList:ChannelsSetCurrent(DOCKING_HOST_DRAW_CHANNEL_BG)
        node.LastBgColor = (bit32.band(node_flags, ImGuiDockNodeFlags.PassthruCentralNode) ~= 0) and 0 or ImGui.GetColorU32(ImGuiCol.DockingEmptyBg)
        if node.LastBgColor ~= 0 then
            host_window.DrawList:AddRectFilled(node.Pos, node.Pos + node.Size, node.LastBgColor)
        end
        node.IsBgDrawnThisFrame = true
    end

    local render_dockspace_bg = node:IsRootNode() and host_window ~= nil and bit32.band(node_flags, ImGuiDockNodeFlags.PassthruCentralNode) ~= 0
    if render_dockspace_bg and node.IsVisible then
        host_window.DrawList:ChannelsSetCurrent(DOCKING_HOST_DRAW_CHANNEL_BG)
        if central_node_hole then
            ImGui.RenderRectFilledWithHole(host_window.DrawList, node:Rect(), central_node:Rect(), ImGui.GetColorU32(ImGuiCol.WindowBg), 0.0)
        else
            host_window.DrawList:AddRectFilled(node.Pos, node.Pos + node.Size, ImGui.GetColorU32(ImGuiCol.WindowBg), 0.0)
        end
    end

    if host_window then host_window.DrawList:ChannelsSetCurrent(DOCKING_HOST_DRAW_CHANNEL_FG) end
    if host_window and node.Windows.Size > 0 then
        ImGui.DockNodeUpdateTabBar(node, host_window)
    else
        node.WantCloseAll = false
        node.WantCloseTabId = 0
        node.IsFocused = false
    end
    if node.TabBar and node.TabBar.SelectedTabId ~= 0 then
        node.SelectedTabId = node.TabBar.SelectedTabId
    elseif node.Windows.Size > 0 then
        node.SelectedTabId = node.Windows.Data[1].TabId
    end

    if host_window and node.IsVisible then
        if node:IsRootNode() and (g.MovingWindow == nil or g.MovingWindow.RootWindowDockTree ~= host_window) then
            ImGui.BeginDockableDragDropTarget(host_window)
        end
    end

    node.LastFrameActive = g.FrameCount

    if host_window then
        if node.ChildNodes[0] then ImGui.DockNodeUpdate(node.ChildNodes[0]) end
        if node.ChildNodes[1] then ImGui.DockNodeUpdate(node.ChildNodes[1]) end
        if node:IsRootNode() then ImGui.RenderWindowOuterBorders(host_window) end
    end

    if beginned_into_host_window then ImGui.End() end
end

local GWindowDockStyleColors = {
    [0] = ImGuiCol.Text, ImGuiCol.TabHovered, ImGuiCol.Tab, ImGuiCol.TabSelected, ImGuiCol.TabSelectedOverline,
    ImGuiCol.TabDimmed, ImGuiCol.TabDimmedSelected, ImGuiCol.TabDimmedSelectedOverline, ImGuiCol.UnsavedMarker,
}
ImGui.GWindowDockStyleColors = GWindowDockStyleColors

local function TabItemComparerByDockOrder(ta, tb)
    local a, b = ta.Window, tb.Window
    local ao = (a.DockOrder == -1) and INT_MAX or a.DockOrder
    local bo = (b.DockOrder == -1) and INT_MAX or b.DockOrder
    if ao ~= bo then return ao < bo end
    return a.BeginOrderWithinContext < b.BeginOrderWithinContext
end

function ImGui.DockNodeWindowMenuHandler_Default(ctx, node, tab_bar)
    if tab_bar.Tabs.Size == 1 then
        if ImGui.MenuItem(ImGui.LocalizeGetMsg(ImGuiLocKey.DockingHideTabBar), nil, node:IsHiddenTabBar()) then
            node.WantHiddenTabBarToggle = true
        end
    else
        for tab_n = 1, tab_bar.Tabs.Size do
            local tab = tab_bar.Tabs.Data[tab_n]
            if bit32.band(tab.Flags, ImGuiTabItemFlags.Button) == 0 then
                if ImGui.Selectable(ImGui.TabBarGetTabName(tab_bar, tab), tab.ID == tab_bar.SelectedTabId) then
                    ImGui.TabBarQueueFocus(tab_bar, tab)
                end
                ImGui.SameLine()
                ImGui.Text("   ")
            end
        end
    end
end

function ImGui.DockNodeWindowMenuUpdate(node, tab_bar)
    local g = ImGui.GetCurrentContext()
    if g.Style.WindowMenuButtonPosition == ImGuiDir.Left then
        ImGui.SetNextWindowPos(ImVec2(node.Pos.x, node.Pos.y + ImGui.GetFrameHeight()), ImGuiCond.Always, ImVec2(0.0, 0.0))
    else
        ImGui.SetNextWindowPos(ImVec2(node.Pos.x + node.Size.x, node.Pos.y + ImGui.GetFrameHeight()), ImGuiCond.Always, ImVec2(1.0, 0.0))
    end
    if ImGui.BeginPopup("#WindowMenu") then
        node.IsFocused = true
        g.DockNodeWindowMenuHandler(g, node, tab_bar)
        ImGui.EndPopup()
    end
end

function ImGui.DockNodeBeginAmendTabBar(node)
    if node.TabBar == nil or node.HostWindow == nil then return false end
    if bit32.band(node.MergedFlags, ImGuiDockNodeFlags.KeepAliveOnly) ~= 0 then return false end
    if node.TabBar.ID == 0 then return false end
    ImGui.Begin(node.HostWindow.Name)
    ImGui.PushOverrideID(node.ID)
    local ret = ImGui.BeginTabBarEx(node.TabBar, node.TabBar.BarRect, node.TabBar.Flags)
    IM_ASSERT(ret)
    return true
end

function ImGui.DockNodeEndAmendTabBar()
    ImGui.EndTabBar()
    ImGui.PopID()
    ImGui.End()
end

local function IsDockNodeTitleBarHighlighted(node, root_node)
    local g = ImGui.GetCurrentContext()
    if g.NavWindowingTarget then
        return g.NavWindowingTarget.DockNode == node
    end
    if g.NavWindow and root_node.LastFocusedNodeId == node.ID then
        local parent_window = g.NavWindow.RootWindow
        while bit32.band(parent_window.Flags, ImGuiWindowFlags.ChildMenu) ~= 0 do
            parent_window = parent_window.ParentWindow.RootWindow
        end
        local parent_node = parent_window.DockNodeAsHost or parent_window.DockNode
        while parent_node ~= nil do
            parent_node = ImGui.DockNodeGetRootNode(parent_node)
            if parent_node == root_node then return true end
            parent_node = parent_node.HostWindow and parent_node.HostWindow.RootWindow.DockNode or nil
        end
    end
    return false
end

function ImGui.DockNodeUpdateTabBar(node, host_window)
    local g = ImGui.GetCurrentContext()
    local style = g.Style

    local node_was_active = (node.LastFrameActive + 1 == g.FrameCount)
    node.WantCloseAll = false
    node.WantCloseTabId = 0

    local is_focused = false
    local root_node = ImGui.DockNodeGetRootNode(node)
    if IsDockNodeTitleBarHighlighted(node, root_node) then is_focused = true end

    if node:IsHiddenTabBar() or node:IsNoTabBar() then
        node.VisibleWindow = (node.Windows.Size > 0) and node.Windows.Data[1] or nil
        node.IsFocused = is_focused
        if is_focused then node.LastFrameFocused = g.FrameCount end
        if node.VisibleWindow then
            if is_focused or root_node.VisibleWindow == nil then root_node.VisibleWindow = node.VisibleWindow end
            if node.TabBar then node.TabBar.VisibleTabId = node.VisibleWindow.TabId end
        end
        return
    end

    local backup_skip_item = host_window.SkipItems
    if not node:IsDockSpace() then
        host_window.SkipItems = false
        host_window.DC.NavLayerCurrent = ImGuiNavLayer.Menu
    end

    ImGui.PushOverrideID(node.ID)
    local tab_bar = node.TabBar
    local tab_bar_is_recreated = (tab_bar == nil)
    if tab_bar == nil then
        ImGui.DockNodeAddTabBar(node)
        tab_bar = node.TabBar
    end

    local focus_tab_id = 0
    node.IsFocused = is_focused

    local node_flags = node.MergedFlags
    local has_window_menu_button = bit32.band(node_flags, ImGuiDockNodeFlags.NoWindowMenuButton) == 0 and (style.WindowMenuButtonPosition ~= ImGuiDir.None)

    if has_window_menu_button and ImGui.IsPopupOpen("#WindowMenu") then
        local next_selected_tab_id = tab_bar.NextSelectedTabId
        ImGui.DockNodeWindowMenuUpdate(node, tab_bar)
        if tab_bar.NextSelectedTabId ~= 0 and tab_bar.NextSelectedTabId ~= next_selected_tab_id then
            focus_tab_id = tab_bar.NextSelectedTabId
        end
        is_focused = is_focused or node.IsFocused
    end

    local title_bar_rect, tab_bar_rect, window_menu_button_pos, close_button_pos = ImGui.DockNodeCalcTabBarLayout(node)

    local tabs_count_old = tab_bar.Tabs.Size
    for window_n = 1, node.Windows.Size do
        local window = node.Windows.Data[window_n]
        if ImGui.TabBarFindTabByID(tab_bar, window.TabId) == nil then
            ImGui.TabBarAddTab(tab_bar, ImGuiTabItemFlags.Unsorted, window)
        end
    end

    if is_focused then node.LastFrameFocused = g.FrameCount end
    local title_bar_col = ImGui.GetColorU32(host_window.Collapsed and ImGuiCol.TitleBgCollapsed or (is_focused and ImGuiCol.TitleBgActive or ImGuiCol.TitleBg))
    local rounding_flags = ImGui.CalcRoundingFlagsForRectInRect(title_bar_rect, host_window:Rect(), g.Style.DockingSeparatorSize)
    host_window.DrawList:AddRectFilled(title_bar_rect.Min, title_bar_rect.Max, title_bar_col, host_window.WindowRounding, rounding_flags)

    if has_window_menu_button then
        if ImGui.CollapseButton(host_window:GetID("#COLLAPSE"), window_menu_button_pos, node) then
            ImGui.OpenPopup("#WindowMenu")
        end
        if ImGui.IsItemActive() then focus_tab_id = tab_bar.SelectedTabId end
        if ImGui.IsItemHovered(bit32.bor(ImGuiHoveredFlags.ForTooltip, ImGuiHoveredFlags.DelayNormal)) and g.HoveredIdTimer > 0.5 then
            ImGui.SetTooltip("%s", ImGui.LocalizeGetMsg(ImGuiLocKey.DockingDragToUndockOrMoveNode))
        end
    end

    local tabs_unsorted_start = tab_bar.Tabs.Size -- 0-based
    local tab_n = tab_bar.Tabs.Size - 1
    while tab_n >= 0 and bit32.band(tab_bar.Tabs.Data[tab_n + 1].Flags, ImGuiTabItemFlags.Unsorted) ~= 0 do
        local t = tab_bar.Tabs.Data[tab_n + 1]
        t.Flags = bit32.band(t.Flags, bit32.bnot(ImGuiTabItemFlags.Unsorted))
        tabs_unsorted_start = tab_n
        tab_n = tab_n - 1
    end
    if tab_bar.Tabs.Size > tabs_unsorted_start + 1 then
        local slice = {}
        for i = tabs_unsorted_start + 1, tab_bar.Tabs.Size do slice[#slice + 1] = tab_bar.Tabs.Data[i] end
        table.sort(slice, TabItemComparerByDockOrder)
        for i, t in ipairs(slice) do tab_bar.Tabs.Data[tabs_unsorted_start + i] = t end
    end

    if g.NavWindow and g.NavWindow.RootWindow.DockNode == node then
        tab_bar.SelectedTabId = g.NavWindow.RootWindow.TabId
    end

    if tab_bar_is_recreated and ImGui.TabBarFindTabByID(tab_bar, node.SelectedTabId) ~= nil then
        tab_bar.SelectedTabId = node.SelectedTabId
        tab_bar.NextSelectedTabId = node.SelectedTabId
    elseif tab_bar.Tabs.Size > tabs_count_old then
        tab_bar.SelectedTabId = tab_bar.Tabs.Data[tab_bar.Tabs.Size].Window.TabId
        tab_bar.NextSelectedTabId = tab_bar.SelectedTabId
    end

    local tab_bar_flags = bit32.bor(ImGuiTabBarFlags.Reorderable, ImGuiTabBarFlags.AutoSelectNewTabs)
    tab_bar_flags = bit32.bor(tab_bar_flags, ImGuiTabBarFlags.SaveSettings, ImGuiTabBarFlags.DockNode)
    tab_bar_flags = bit32.bor(tab_bar_flags, ImGuiTabBarFlags.FittingPolicyMixed)
    tab_bar_flags = bit32.bor(tab_bar_flags, ImGuiTabBarFlags.DrawSelectedOverline)
    if not host_window.Collapsed and is_focused then
        tab_bar_flags = bit32.bor(tab_bar_flags, ImGuiTabBarFlags.IsFocused)
    end
    tab_bar.ID = node.ID
    tab_bar.SeparatorMinX = node.Pos.x + host_window.WindowBorderSize
    tab_bar.SeparatorMaxX = node.Pos.x + node.Size.x - host_window.WindowBorderSize
    ImGui.BeginTabBarEx(tab_bar, tab_bar_rect, tab_bar_flags)

    local backup_style_cols = {}
    for color_n = 0, ImGuiWindowDockStyleCol.COUNT - 1 do
        local c = g.Style.Colors[GWindowDockStyleColors[color_n]]
        backup_style_cols[color_n] = ImVec4(c.x, c.y, c.z, c.w)
    end

    node.VisibleWindow = nil
    for window_n = 1, node.Windows.Size do
        local window = node.Windows.Data[window_n]
        if not (window.LastFrameActive + 1 < g.FrameCount and node_was_active) then
            local tab_item_flags = 0
            tab_item_flags = bit32.bor(tab_item_flags, window.WindowClass.TabItemFlagsOverrideSet or 0)
            if bit32.band(window.Flags, ImGuiWindowFlags.UnsavedDocument) ~= 0 then
                tab_item_flags = bit32.bor(tab_item_flags, ImGuiTabItemFlags.UnsavedDocument)
            end
            if bit32.band(tab_bar.Flags, ImGuiTabBarFlags.NoCloseWithMiddleMouseButton) ~= 0 then
                tab_item_flags = bit32.bor(tab_item_flags, ImGuiTabItemFlags.NoCloseWithMiddleMouseButton)
            end

            for color_n = 0, ImGuiWindowDockStyleCol.COUNT - 1 do
                ImVec4_Copy(g.Style.Colors[GWindowDockStyleColors[color_n]], ImGui.ColorConvertU32ToFloat4(window.DockStyle.Colors[color_n]))
            end

            local _, tab_open = ImGui.TabItemEx(tab_bar, window.Name, window.HasCloseButton and true or nil, tab_item_flags, window)
            if tab_open == false then node.WantCloseTabId = window.TabId end
            if tab_bar.VisibleTabId == window.TabId then node.VisibleWindow = window end

            window.DC.DockTabItemStatusFlags = g.LastItemData.StatusFlags
            window.DC.DockTabItemRect = ImRect(g.LastItemData.Rect.Min, g.LastItemData.Rect.Max)

            if g.NavWindow and g.NavWindow.RootWindow == window and bit32.band(window.DC.NavLayersActiveMask, bit32.lshift(1, ImGuiNavLayer.Menu)) == 0 then
                host_window.NavLastIds[1] = window.TabId
            end
        end
    end

    for color_n = 0, ImGuiWindowDockStyleCol.COUNT - 1 do
        ImVec4_Copy(g.Style.Colors[GWindowDockStyleColors[color_n]], backup_style_cols[color_n])
    end

    if node.VisibleWindow then
        if is_focused or root_node.VisibleWindow == nil then root_node.VisibleWindow = node.VisibleWindow end
    end

    local close_button_is_enabled = node.HasCloseButton and node.VisibleWindow and node.VisibleWindow.HasCloseButton
    local close_button_is_visible = node.HasCloseButton
    if close_button_is_visible then
        if not close_button_is_enabled then
            ImGui.PushItemFlag(ImGuiItemFlags.Disabled, true)
            local tc = style.Colors[ImGuiCol.Text]
            ImGui.PushStyleColor(ImGuiCol.Text, ImVec4(tc.x, tc.y, tc.z, tc.w * 0.4))
        end
        if ImGui.CloseButton(host_window:GetID("#CLOSE"), close_button_pos) then
            node.WantCloseAll = true
            for n = 1, tab_bar.Tabs.Size do ImGui.TabBarCloseTab(tab_bar, tab_bar.Tabs.Data[n]) end
        end
        if not close_button_is_enabled then
            ImGui.PopStyleColor()
            ImGui.PopItemFlag()
        end
    end

    local title_bar_id = host_window:GetID("#TITLEBAR")
    if g.HoveredId == 0 or g.HoveredId == title_bar_id or g.ActiveId == title_bar_id then
        ImGui.KeepAliveID(title_bar_id)
        local _, _, held = ImGui.ButtonBehavior(title_bar_rect, title_bar_id, ImGuiButtonFlags.AllowOverlap)
        if g.HoveredId == title_bar_id then g.LastItemData.ID = title_bar_id end
        if held then
            if ImGui.IsMouseClicked(0) then focus_tab_id = tab_bar.SelectedTabId end
            local tab = ImGui.TabBarFindTabByID(tab_bar, tab_bar.SelectedTabId)
            if tab then
                ImGui.StartMouseMovingWindowOrNode(tab.Window or node.HostWindow, node, false)
            end
        end
    end

    if tab_bar.NextSelectedTabId ~= 0 then focus_tab_id = tab_bar.NextSelectedTabId end

    if focus_tab_id ~= 0 then
        local tab = ImGui.TabBarFindTabByID(tab_bar, focus_tab_id)
        if tab and tab.Window then
            ImGui.FocusWindow(tab.Window)
            if g.NavId == 0 then ImGui.NavInitWindow(tab.Window, false) end
        end
    end

    ImGui.EndTabBar()
    ImGui.PopID()

    if not node:IsDockSpace() then
        host_window.DC.NavLayerCurrent = ImGuiNavLayer.Main
        host_window.SkipItems = backup_skip_item
    end
end

function ImGui.DockNodeAddTabBar(node)
    IM_ASSERT(node.TabBar == nil)
    node.TabBar = ImGuiTabBar()
end

function ImGui.DockNodeRemoveTabBar(node)
    if node.TabBar == nil then return end
    node.TabBar = nil
end
local function DockNodeIsDropAllowedOne(payload, host_window)
    if host_window.DockNodeAsHost and host_window.DockNodeAsHost:IsDockSpace() and payload.BeginOrderWithinContext < host_window.BeginOrderWithinContext then
        return false
    end

    local host_class = host_window.DockNodeAsHost and host_window.DockNodeAsHost.WindowClass or host_window.WindowClass
    local payload_class = payload.WindowClass
    if host_class.ClassId ~= payload_class.ClassId then
        local pass = false
        if host_class.ClassId ~= 0 and host_class.DockingAllowUnclassed and payload_class.ClassId == 0 then pass = true end
        if payload_class.ClassId ~= 0 and payload_class.DockingAllowUnclassed and host_class.ClassId == 0 then pass = true end
        if not pass then return false end
    end

    local g = ImGui.GetCurrentContext()
    for i = g.OpenPopupStack.Size, 1, -1 do
        local popup_window = g.OpenPopupStack.Data[i].Window
        if popup_window and ImGui.IsWindowWithinBeginStackOf(payload, popup_window) then
            return false
        end
    end
    return true
end

function ImGui.DockNodeIsDropAllowed(host_window, root_payload)
    if root_payload.DockNodeAsHost and root_payload.DockNodeAsHost:IsSplitNode() then return true end
    local payload_count = root_payload.DockNodeAsHost and root_payload.DockNodeAsHost.Windows.Size or 1
    for payload_n = 1, payload_count do
        local payload = root_payload.DockNodeAsHost and root_payload.DockNodeAsHost.Windows.Data[payload_n] or root_payload
        if DockNodeIsDropAllowedOne(payload, host_window) then return true end
    end
    return false
end

--- @return ImRect title_rect, ImRect tab_bar_rect, ImVec2 window_menu_button_pos, ImVec2? close_button_pos
function ImGui.DockNodeCalcTabBarLayout(node)
    local g = ImGui.GetCurrentContext()
    local style = g.Style

    local r = ImRect(node.Pos.x, node.Pos.y, node.Pos.x + node.Size.x, node.Pos.y + g.FontSize + g.Style.FramePadding.y * 2.0)
    local out_title_rect = ImRect(r.Min, r.Max)

    r.Min.x = r.Min.x + style.WindowBorderSize
    r.Max.x = r.Max.x - style.WindowBorderSize

    local button_sz = g.FontSize
    r.Min.x = r.Min.x + style.FramePadding.x
    r.Max.x = r.Max.x - style.FramePadding.x
    local window_menu_button_pos = ImVec2(r.Min.x, r.Min.y + style.FramePadding.y)
    local out_close_button_pos = nil
    if node.HasCloseButton then
        out_close_button_pos = ImVec2(r.Max.x - button_sz, r.Min.y + style.FramePadding.y)
        r.Max.x = r.Max.x - (button_sz + style.ItemInnerSpacing.x)
    end
    if node.HasWindowMenuButton and style.WindowMenuButtonPosition == ImGuiDir.Left then
        r.Min.x = r.Min.x + button_sz + style.ItemInnerSpacing.x
    elseif node.HasWindowMenuButton and style.WindowMenuButtonPosition == ImGuiDir.Right then
        window_menu_button_pos = ImVec2(r.Max.x - button_sz, r.Min.y + style.FramePadding.y)
        r.Max.x = r.Max.x - (button_sz + style.ItemInnerSpacing.x)
    end
    return out_title_rect, r, window_menu_button_pos, out_close_button_pos
end

--- Modifies pos_old/size_old/pos_new/size_new in place (ImVec2 tables)
function ImGui.DockNodeCalcSplitRects(pos_old, size_old, pos_new, size_new, dir, size_new_desired)
    local g = ImGui.GetCurrentContext()
    local dock_spacing = g.Style.ItemInnerSpacing.x
    local axis = (dir == ImGuiDir.Left or dir == ImGuiDir.Right) and ImGuiAxis.X or ImGuiAxis.Y
    local a, o = axis, 3 - axis -- the port's ImGuiAxis is 1-based (X=1,Y=2): it is directly the ImVec2 index
    pos_new[o] = pos_old[o]
    size_new[o] = size_old[o]

    local w_avail = size_old[a] - dock_spacing
    if size_new_desired[a] > 0.0 and size_new_desired[a] <= w_avail * 0.5 then
        size_new[a] = size_new_desired[a]
        size_old[a] = IM_TRUNC(w_avail - size_new[a])
    else
        size_new[a] = IM_TRUNC(w_avail * 0.5)
        size_old[a] = IM_TRUNC(w_avail - size_new[a])
    end

    if dir == ImGuiDir.Right or dir == ImGuiDir.Down then
        pos_new[a] = pos_old[a] + size_old[a] + dock_spacing
    elseif dir == ImGuiDir.Left or dir == ImGuiDir.Up then
        pos_new[a] = pos_old[a]
        pos_old[a] = pos_new[a] + size_new[a] + dock_spacing
    end
end

local function ImGetDirQuadrantFromDeltaLocal(dx, dy)
    if math.abs(dx) > math.abs(dy) then
        return (dx > 0.0) and ImGuiDir.Right or ImGuiDir.Left
    end
    return (dy > 0.0) and ImGuiDir.Down or ImGuiDir.Up
end

--- @return bool hit, ImRect out_r
function ImGui.DockNodeCalcDropRectsAndTestMousePos(parent, dir, outer_docking, test_mouse_pos)
    local g = ImGui.GetCurrentContext()

    local parent_smaller_axis = ImMin(parent:GetWidth(), parent:GetHeight())
    local hs_for_central_nodes = ImMin(g.FontSize * 1.5, ImMax(g.FontSize * 0.5, parent_smaller_axis / 8.0))
    local hs_w, hs_h, off
    if outer_docking then
        hs_w = ImTrunc(hs_for_central_nodes * 1.50)
        hs_h = ImTrunc(hs_for_central_nodes * 0.80)
        off = ImVec2(ImTrunc(parent:GetWidth() * 0.5 - hs_h), ImTrunc(parent:GetHeight() * 0.5 - hs_h))
    else
        hs_w = ImTrunc(hs_for_central_nodes)
        hs_h = ImTrunc(hs_for_central_nodes * 0.90)
        off = ImVec2(ImTrunc(hs_w * 2.40), ImTrunc(hs_w * 2.40))
    end

    local pc = parent:GetCenter()
    local c = ImVec2(ImTrunc(pc.x), ImTrunc(pc.y))
    local out_r
    if dir == ImGuiDir.None then out_r = ImRect(c.x - hs_w, c.y - hs_w, c.x + hs_w, c.y + hs_w)
    elseif dir == ImGuiDir.Up then out_r = ImRect(c.x - hs_w, c.y - off.y - hs_h, c.x + hs_w, c.y - off.y + hs_h)
    elseif dir == ImGuiDir.Down then out_r = ImRect(c.x - hs_w, c.y + off.y - hs_h, c.x + hs_w, c.y + off.y + hs_h)
    elseif dir == ImGuiDir.Left then out_r = ImRect(c.x - off.x - hs_h, c.y - hs_w, c.x - off.x + hs_h, c.y + hs_w)
    elseif dir == ImGuiDir.Right then out_r = ImRect(c.x + off.x - hs_h, c.y - hs_w, c.x + off.x + hs_h, c.y + hs_w) end

    if test_mouse_pos == nil then return false, out_r end

    local hit_r = ImRect(out_r.Min, out_r.Max)
    if not outer_docking then
        hit_r:Expand(ImTrunc(hs_w * 0.30))
        local mdx, mdy = test_mouse_pos.x - c.x, test_mouse_pos.y - c.y
        local mouse_delta_len2 = mdx * mdx + mdy * mdy
        local r_threshold_center = hs_w * 1.4
        local r_threshold_sides = hs_w * (1.4 + 1.2)
        if mouse_delta_len2 < r_threshold_center * r_threshold_center then
            return (dir == ImGuiDir.None), out_r
        end
        if mouse_delta_len2 < r_threshold_sides * r_threshold_sides then
            return (dir == ImGetDirQuadrantFromDeltaLocal(mdx, mdy)), out_r
        end
    end
    return hit_r:Contains(test_mouse_pos), out_r
end

function ImGui.DockNodePreviewDockSetup(host_window, host_node, payload_window, payload_node, data, is_explicit_target, is_outer_docking)
    local g = ImGui.GetCurrentContext()

    if payload_node == nil then payload_node = payload_window.DockNodeAsHost end
    local ref_node_for_rect = (host_node and not host_node.IsVisible) and ImGui.DockNodeGetRootNode(host_node) or host_node
    if ref_node_for_rect then IM_ASSERT(ref_node_for_rect.IsVisible == true) end

    local src_node_flags = payload_node and payload_node.MergedFlags or payload_window.WindowClass.DockNodeFlagsOverrideSet
    local dst_node_flags = host_node and host_node.MergedFlags or host_window.WindowClass.DockNodeFlagsOverrideSet
    data.IsCenterAvailable = true
    if is_outer_docking then
        data.IsCenterAvailable = false
    elseif g.IO.ConfigDockingNoDockingOver then
        data.IsCenterAvailable = false
    elseif bit32.band(dst_node_flags, ImGuiDockNodeFlags.NoDockingOverMe) ~= 0 then
        data.IsCenterAvailable = false
    elseif host_node and bit32.band(dst_node_flags, ImGuiDockNodeFlags.NoDockingOverCentralNode) ~= 0 and host_node:IsCentralNode() then
        data.IsCenterAvailable = false
    elseif (not host_node or not host_node:IsEmpty()) and payload_node and payload_node:IsSplitNode() and (payload_node.OnlyNodeWithWindows == nil) then
        data.IsCenterAvailable = false
    elseif bit32.band(src_node_flags, ImGuiDockNodeFlags.NoDockingOverOther) ~= 0 and (not host_node or not host_node:IsEmpty()) then
        data.IsCenterAvailable = false
    elseif bit32.band(src_node_flags, ImGuiDockNodeFlags.NoDockingOverEmpty) ~= 0 and host_node and host_node:IsEmpty() then
        data.IsCenterAvailable = false
    end

    data.IsSidesAvailable = true
    if bit32.band(dst_node_flags, ImGuiDockNodeFlags.NoDockingSplit) ~= 0 or g.IO.ConfigDockingNoSplit then
        data.IsSidesAvailable = false
    elseif not is_outer_docking and host_node and host_node.ParentNode == nil and host_node:IsCentralNode() then
        data.IsSidesAvailable = false
    elseif bit32.band(src_node_flags, ImGuiDockNodeFlags.NoDockingSplitOther) ~= 0 then
        data.IsSidesAvailable = false
    end

    data.FutureNode.HasCloseButton = (host_node and host_node.HasCloseButton or (not host_node and host_window.HasCloseButton)) or payload_window.HasCloseButton
    data.FutureNode.HasWindowMenuButton = host_node and true or (bit32.band(host_window.Flags, ImGuiWindowFlags.NoCollapse) == 0)
    local rp = ref_node_for_rect and ref_node_for_rect.Pos or host_window.Pos
    local rs = ref_node_for_rect and ref_node_for_rect.Size or host_window.Size
    data.FutureNode.Pos = ImVec2(rp.x, rp.y)
    data.FutureNode.Size = ImVec2(rs.x, rs.y)

    data.SplitNode = host_node
    data.SplitDir = ImGuiDir.None
    data.IsSplitDirExplicit = false
    if not host_window.Collapsed then
        for dir = ImGuiDir.None, ImGuiDir.COUNT - 1 do
            if not ((dir == ImGuiDir.None and not data.IsCenterAvailable) or (dir ~= ImGuiDir.None and not data.IsSidesAvailable)) then
                local hit, r = ImGui.DockNodeCalcDropRectsAndTestMousePos(data.FutureNode:Rect(), dir, is_outer_docking, g.IO.MousePos)
                data.DropRectsDraw[dir + 1] = r
                if hit then
                    data.SplitDir = dir
                    data.IsSplitDirExplicit = true
                end
            end
        end
    end

    data.IsDropAllowed = (data.SplitDir ~= ImGuiDir.None) or data.IsCenterAvailable
    if not is_explicit_target and not data.IsSplitDirExplicit and not g.IO.ConfigDockingWithShift then
        data.IsDropAllowed = false
    end

    data.SplitRatio = 0.0
    if data.SplitDir ~= ImGuiDir.None then
        local split_dir = data.SplitDir
        local split_axis = (split_dir == ImGuiDir.Left or split_dir == ImGuiDir.Right) and ImGuiAxis.X or ImGuiAxis.Y
        local pos_new, pos_old = ImVec2(0, 0), ImVec2(data.FutureNode.Pos.x, data.FutureNode.Pos.y)
        local size_new, size_old = ImVec2(0, 0), ImVec2(data.FutureNode.Size.x, data.FutureNode.Size.y)
        ImGui.DockNodeCalcSplitRects(pos_old, size_old, pos_new, size_new, split_dir, payload_window.Size)

        local split_ratio = ImSaturate(size_new[split_axis] / data.FutureNode.Size[split_axis])
        data.FutureNode.Pos = pos_new
        data.FutureNode.Size = size_new
        data.SplitRatio = (split_dir == ImGuiDir.Right or split_dir == ImGuiDir.Down) and (1.0 - split_ratio) or split_ratio
    end
end

function ImGui.DockNodePreviewDockRender(host_window, host_node, root_payload, data)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(g.CurrentWindow == host_window)

    local is_transparent_payload = g.IO.ConfigDockingTransparentPayload

    local overlay_draw_lists = { ImGui.GetForegroundDrawList(host_window.Viewport) }

    local overlay_col_main = ImGui.GetColorU32(ImGuiCol.DockingPreview, is_transparent_payload and 0.60 or 0.40)
    local overlay_col_drop = ImGui.GetColorU32(ImGuiCol.DockingPreview, is_transparent_payload and 0.90 or 0.70)
    local overlay_col_drop_hovered = ImGui.GetColorU32(ImGuiCol.DockingPreview, is_transparent_payload and 1.20 or 1.00)
    local overlay_col_lines = ImGui.GetColorU32(ImGuiCol.NavWindowingHighlight, is_transparent_payload and 0.80 or 0.60)

    local can_preview_tabs = (root_payload.DockNodeAsHost == nil or root_payload.DockNodeAsHost.Windows.Size > 0)
    if data.IsDropAllowed then
        local overlay_rect = data.FutureNode:Rect()
        if data.SplitDir == ImGuiDir.None and can_preview_tabs then
            overlay_rect.Min.y = overlay_rect.Min.y + ImGui.GetFrameHeight()
        end
        if data.SplitDir ~= ImGuiDir.None or data.IsCenterAvailable then
            for _, dl in ipairs(overlay_draw_lists) do
                dl:AddRectFilled(overlay_rect.Min, overlay_rect.Max, overlay_col_main, host_window.WindowRounding, ImGui.CalcRoundingFlagsForRectInRect(overlay_rect, host_window:Rect(), g.Style.DockingSeparatorSize))
            end
        end
    end

    if data.IsDropAllowed and can_preview_tabs and data.SplitDir == ImGuiDir.None and data.IsCenterAvailable then
        local _, tab_bar_rect = ImGui.DockNodeCalcTabBarLayout(data.FutureNode)
        local tab_pos = ImVec2(tab_bar_rect.Min.x, tab_bar_rect.Min.y)
        if host_node and host_node.TabBar then
            if not host_node:IsHiddenTabBar() and not host_node:IsNoTabBar() then
                tab_pos.x = tab_pos.x + host_node.TabBar.WidthAllTabs + g.Style.ItemInnerSpacing.x
            else
                tab_pos.x = tab_pos.x + g.Style.ItemInnerSpacing.x + ImGui.TabItemCalcSize(host_node.Windows.Data[1]).x
            end
        elseif bit32.band(host_window.Flags, ImGuiWindowFlags.DockNodeHost) == 0 then
            tab_pos.x = tab_pos.x + g.Style.ItemInnerSpacing.x + ImGui.TabItemCalcSize(host_window).x
        end

        if root_payload.DockNodeAsHost then
            IM_ASSERT(root_payload.DockNodeAsHost.Windows.Size <= root_payload.DockNodeAsHost.TabBar.Tabs.Size)
        end
        local tab_bar_with_payload = root_payload.DockNodeAsHost and root_payload.DockNodeAsHost.TabBar or nil
        local payload_count = tab_bar_with_payload and tab_bar_with_payload.Tabs.Size or 1
        for payload_n = 1, payload_count do
            local payload_window = tab_bar_with_payload and tab_bar_with_payload.Tabs.Data[payload_n].Window or root_payload
            if not (tab_bar_with_payload and payload_window == nil) and DockNodeIsDropAllowedOne(payload_window, host_window) then
                local tab_size = ImGui.TabItemCalcSize(payload_window)
                local tab_bb = ImRect(tab_pos.x, tab_pos.y, tab_pos.x + tab_size.x, tab_pos.y + tab_size.y)
                tab_pos.x = tab_pos.x + tab_size.x + g.Style.ItemInnerSpacing.x
                local overlay_col_text = ImGui.GetColorU32(payload_window.DockStyle.Colors[ImGuiWindowDockStyleCol.Text], 1.0, true)
                local overlay_col_tabs = ImGui.GetColorU32(payload_window.DockStyle.Colors[ImGuiWindowDockStyleCol.TabSelected], 1.0, true)
                local overlay_col_unsaved_marker = ImGui.GetColorU32(payload_window.DockStyle.Colors[ImGuiWindowDockStyleCol.UnsavedMarker], 1.0, true)
                ImGui.PushStyleColor(ImGuiCol.Text, ImGui.ColorConvertU32ToFloat4(overlay_col_text))
                ImGui.PushStyleColor(ImGuiCol.UnsavedMarker, ImGui.ColorConvertU32ToFloat4(overlay_col_unsaved_marker))
                for _, dl in ipairs(overlay_draw_lists) do
                    local tab_flags = bit32.band(payload_window.Flags, ImGuiWindowFlags.UnsavedDocument) ~= 0 and ImGuiTabItemFlags.UnsavedDocument or 0
                    local contains = tab_bar_rect:Contains(tab_bb)
                    if not contains then dl:PushClipRect(tab_bar_rect.Min, tab_bar_rect.Max) end
                    ImGui.TabItemBackground(dl, tab_bb, tab_flags, overlay_col_tabs)
                    ImGui.TabItemLabelAndCloseButton(dl, tab_bb, tab_flags, g.Style.FramePadding, payload_window.Name, 0, 0, false)
                    if not contains then dl:PopClipRect() end
                end
                ImGui.PopStyleColor(2)
            end
        end
    end

    local scale = g.Style._MainScale or 1.0
    local overlay_rounding = ImMax(math.floor(3.0 * scale), g.Style.FrameRounding)
    for dir = ImGuiDir.None, ImGuiDir.COUNT - 1 do
        local draw_r = data.DropRectsDraw[dir + 1]
        if not IsRectInverted(draw_r) then
            local draw_r_in = ImRect(draw_r.Min, draw_r.Max)
            draw_r_in:Expand(math.floor(-2.0 * scale))
            local overlay_col = (data.SplitDir == dir and data.IsSplitDirExplicit) and overlay_col_drop_hovered or overlay_col_drop
            local thickness = math.floor(1.0 * scale)
            for _, dl in ipairs(overlay_draw_lists) do
                local cc = draw_r_in:GetCenter()
                local center = ImVec2(math.floor(cc.x), math.floor(cc.y))
                dl:AddRectFilled(draw_r.Min, draw_r.Max, overlay_col, overlay_rounding)
                dl:AddRect(draw_r_in.Min, draw_r_in.Max, overlay_col_lines, overlay_rounding, thickness)
                if dir == ImGuiDir.Left or dir == ImGuiDir.Right then
                    dl:AddLineV(center.x, draw_r_in.Min.y, draw_r_in.Max.y, overlay_col_lines, thickness)
                end
                if dir == ImGuiDir.Up or dir == ImGuiDir.Down then
                    dl:AddLineH(draw_r_in.Min.x, draw_r_in.Max.x, center.y, overlay_col_lines, thickness)
                end
            end
        end
        if (host_node and bit32.band(host_node.MergedFlags, ImGuiDockNodeFlags.NoDockingSplit) ~= 0) or g.IO.ConfigDockingNoSplit then
            return
        end
    end
end

---------------------------------------------------------------------------------------
-- Docking: ImGuiDockNode Tree manipulation functions
---------------------------------------------------------------------------------------

function ImGui.DockNodeTreeSplit(ctx, parent_node, split_axis, split_inheritor_child_idx, split_ratio, new_node)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(split_axis ~= ImGuiAxis.None)

    local child_0 = (new_node and split_inheritor_child_idx ~= 0) and new_node or ImGui.DockContextAddNode(ctx, 0)
    child_0.ParentNode = parent_node

    local child_1 = (new_node and split_inheritor_child_idx ~= 1) and new_node or ImGui.DockContextAddNode(ctx, 0)
    child_1.ParentNode = parent_node

    local child_inheritor = (split_inheritor_child_idx == 0) and child_0 or child_1
    ImGui.DockNodeMoveChildNodes(child_inheritor, parent_node)
    parent_node.ChildNodes[0] = child_0
    parent_node.ChildNodes[1] = child_1
    parent_node.ChildNodes[split_inheritor_child_idx].VisibleWindow = parent_node.VisibleWindow
    parent_node.SplitAxis = split_axis
    parent_node.VisibleWindow = nil
    parent_node.AuthorityForPos = ImGuiDataAuthority.DockNode
    parent_node.AuthorityForSize = ImGuiDataAuthority.DockNode

    local a = split_axis
    local size_avail = parent_node.Size[a] - g.Style.DockingSeparatorSize
    size_avail = ImMax(size_avail, g.Style.WindowMinSize[a] * 2.0)
    IM_ASSERT(size_avail > 0.0)
    child_0.SizeRef = ImVec2(parent_node.Size.x, parent_node.Size.y)
    child_1.SizeRef = ImVec2(parent_node.Size.x, parent_node.Size.y)
    child_0.SizeRef[a] = ImTrunc(size_avail * split_ratio)
    child_1.SizeRef[a] = ImTrunc(size_avail - child_0.SizeRef[a])

    ImGui.DockNodeMoveWindows(parent_node.ChildNodes[split_inheritor_child_idx], parent_node)
    DockSettingsRenameNodeReferences(parent_node.ID, parent_node.ChildNodes[split_inheritor_child_idx].ID)
    ImGui.DockNodeUpdateHasCentralNodeChild(ImGui.DockNodeGetRootNode(parent_node))
    ImGui.DockNodeTreeUpdatePosSize(parent_node, parent_node.Pos, parent_node.Size)

    child_0.SharedFlags = bit32.band(parent_node.SharedFlags, ImGuiDockNodeFlags.SharedFlagsInheritMask_)
    child_1.SharedFlags = bit32.band(parent_node.SharedFlags, ImGuiDockNodeFlags.SharedFlagsInheritMask_)
    child_inheritor.LocalFlags = bit32.band(parent_node.LocalFlags, ImGuiDockNodeFlags.LocalFlagsTransferMask_)
    parent_node.LocalFlags = bit32.band(parent_node.LocalFlags, bit32.bnot(ImGuiDockNodeFlags.LocalFlagsTransferMask_))
    child_0:UpdateMergedFlags()
    child_1:UpdateMergedFlags()
    parent_node:UpdateMergedFlags()
    if child_inheritor:IsCentralNode() then
        ImGui.DockNodeGetRootNode(parent_node).CentralNode = child_inheritor
    end
end

function ImGui.DockNodeTreeMerge(ctx, parent_node, merge_lead_child)
    local child_0 = parent_node.ChildNodes[0]
    local child_1 = parent_node.ChildNodes[1]
    IM_ASSERT(child_0 or child_1)
    IM_ASSERT(merge_lead_child == child_0 or merge_lead_child == child_1)
    if (child_0 and child_0.Windows.Size > 0) or (child_1 and child_1.Windows.Size > 0) then
        IM_ASSERT(parent_node.TabBar == nil)
        IM_ASSERT(parent_node.Windows.Size == 0)
    end

    local backup_last_explicit_size = ImVec2(parent_node.SizeRef.x, parent_node.SizeRef.y)
    ImGui.DockNodeMoveChildNodes(parent_node, merge_lead_child)
    if child_0 then
        ImGui.DockNodeMoveWindows(parent_node, child_0)
        DockSettingsRenameNodeReferences(child_0.ID, parent_node.ID)
    end
    if child_1 then
        ImGui.DockNodeMoveWindows(parent_node, child_1)
        DockSettingsRenameNodeReferences(child_1.ID, parent_node.ID)
    end
    ImGui.DockNodeApplyPosSizeToWindows(parent_node)
    parent_node.AuthorityForPos = ImGuiDataAuthority.Auto
    parent_node.AuthorityForSize = ImGuiDataAuthority.Auto
    parent_node.AuthorityForViewport = ImGuiDataAuthority.Auto
    parent_node.VisibleWindow = merge_lead_child.VisibleWindow
    parent_node.SizeRef = backup_last_explicit_size

    local M = ImGuiDockNodeFlags.LocalFlagsTransferMask_
    parent_node.LocalFlags = bit32.band(parent_node.LocalFlags, bit32.bnot(M))
    parent_node.LocalFlags = bit32.bor(parent_node.LocalFlags, bit32.band(child_0 and child_0.LocalFlags or 0, M))
    parent_node.LocalFlags = bit32.bor(parent_node.LocalFlags, bit32.band(child_1 and child_1.LocalFlags or 0, M))
    parent_node.LocalFlagsInWindows = bit32.bor(child_0 and child_0.LocalFlagsInWindows or 0, child_1 and child_1.LocalFlagsInWindows or 0)
    parent_node:UpdateMergedFlags()

    if child_0 then ImGui.DockContextDeleteNode(ctx, child_0) end
    if child_1 then ImGui.DockContextDeleteNode(ctx, child_1) end
end

function ImGui.DockNodeTreeUpdatePosSize(node, pos, size, only_write_to_single_node)
    local g = ImGui.GetCurrentContext()
    local write_to_node = only_write_to_single_node == nil or only_write_to_single_node == node
    if write_to_node then
        node.Pos = ImVec2(pos.x, pos.y)
        node.Size = ImVec2(size.x, size.y)
    end

    if node:IsLeafNode() then return end

    local child_0 = node.ChildNodes[0]
    local child_1 = node.ChildNodes[1]
    local child_0_pos, child_1_pos = ImVec2(pos.x, pos.y), ImVec2(pos.x, pos.y)
    local child_0_size, child_1_size = ImVec2(size.x, size.y), ImVec2(size.x, size.y)

    local child_0_is_toward_single_node = (only_write_to_single_node ~= nil and ImGui.DockNodeIsInHierarchyOf(only_write_to_single_node, child_0))
    local child_1_is_toward_single_node = (only_write_to_single_node ~= nil and ImGui.DockNodeIsInHierarchyOf(only_write_to_single_node, child_1))
    local child_0_is_or_will_be_visible = child_0.IsVisible or child_0_is_toward_single_node
    local child_1_is_or_will_be_visible = child_1.IsVisible or child_1_is_toward_single_node

    if child_0_is_or_will_be_visible and child_1_is_or_will_be_visible then
        local spacing = g.Style.DockingSeparatorSize
        local a = node.SplitAxis
        local size_avail = ImMax(size[a] - spacing, 0.0)

        local size_min_each = ImTrunc(ImMin(size_avail, g.Style.WindowMinSize[a] * 2.0) * 0.5)

        if child_0.WantLockSizeOnce and not child_1.WantLockSizeOnce then
            child_0_size[a] = ImMin(size_avail - 1.0, child_0.Size[a]); child_0.SizeRef[a] = child_0_size[a]
            child_1_size[a] = size_avail - child_0_size[a]; child_1.SizeRef[a] = child_1_size[a]
        elseif child_1.WantLockSizeOnce and not child_0.WantLockSizeOnce then
            child_1_size[a] = ImMin(size_avail - 1.0, child_1.Size[a]); child_1.SizeRef[a] = child_1_size[a]
            child_0_size[a] = size_avail - child_1_size[a]; child_0.SizeRef[a] = child_0_size[a]
        elseif child_0.WantLockSizeOnce and child_1.WantLockSizeOnce then
            local split_ratio = child_0_size[a] / (child_0_size[a] + child_1_size[a])
            child_0_size[a] = ImTrunc(size_avail * split_ratio); child_0.SizeRef[a] = child_0_size[a]
            child_1_size[a] = size_avail - child_0_size[a]; child_1.SizeRef[a] = child_1_size[a]
        elseif child_0.SizeRef[a] ~= 0.0 and child_1.HasCentralNodeChild then
            child_0_size[a] = ImMin(size_avail - size_min_each, child_0.SizeRef[a])
            child_1_size[a] = size_avail - child_0_size[a]
        elseif child_1.SizeRef[a] ~= 0.0 and child_0.HasCentralNodeChild then
            child_1_size[a] = ImMin(size_avail - size_min_each, child_1.SizeRef[a])
            child_0_size[a] = size_avail - child_1_size[a]
        else
            local split_ratio = child_0.SizeRef[a] / (child_0.SizeRef[a] + child_1.SizeRef[a])
            child_0_size[a] = ImMax(size_min_each, ImTrunc(size_avail * split_ratio + 0.5))
            child_1_size[a] = size_avail - child_0_size[a]
        end

        child_1_pos[a] = child_1_pos[a] + spacing + child_0_size[a]
    end

    if only_write_to_single_node == nil then
        child_0.WantLockSizeOnce = false
        child_1.WantLockSizeOnce = false
    end
    local child_0_recurse = only_write_to_single_node and child_0_is_toward_single_node or (not only_write_to_single_node and child_0.IsVisible)
    local child_1_recurse = only_write_to_single_node and child_1_is_toward_single_node or (not only_write_to_single_node and child_1.IsVisible)
    if child_0_recurse then ImGui.DockNodeTreeUpdatePosSize(child_0, child_0_pos, child_0_size) end
    if child_1_recurse then ImGui.DockNodeTreeUpdatePosSize(child_1, child_1_pos, child_1_size) end
end

local function DockNodeTreeUpdateSplitterFindTouchingNode(node, axis, side, touching_nodes)
    if node:IsLeafNode() then
        table.insert(touching_nodes, node)
        return
    end
    if node.ChildNodes[0].IsVisible then
        if node.SplitAxis ~= axis or side == 0 or not node.ChildNodes[1].IsVisible then
            DockNodeTreeUpdateSplitterFindTouchingNode(node.ChildNodes[0], axis, side, touching_nodes)
        end
    end
    if node.ChildNodes[1].IsVisible then
        if node.SplitAxis ~= axis or side == 1 or not node.ChildNodes[0].IsVisible then
            DockNodeTreeUpdateSplitterFindTouchingNode(node.ChildNodes[1], axis, side, touching_nodes)
        end
    end
end

local WINDOWS_RESIZE_FROM_EDGES_FEEDBACK_TIMER = 0.04

function ImGui.DockNodeTreeUpdateSplitter(node)
    if node:IsLeafNode() then return end

    local g = ImGui.GetCurrentContext()

    local child_0 = node.ChildNodes[0]
    local child_1 = node.ChildNodes[1]
    if child_0.IsVisible and child_1.IsVisible then
        local axis = node.SplitAxis
        IM_ASSERT(axis ~= ImGuiAxis.None)
        local a, o = axis, 3 - axis -- the port's ImGuiAxis is 1-based (X=1,Y=2): it is directly the ImVec2 index
        local bb = ImRect(ImVec2(child_0.Pos.x, child_0.Pos.y), ImVec2(child_1.Pos.x, child_1.Pos.y))
        bb.Min[a] = bb.Min[a] + child_0.Size[a]
        bb.Max[o] = bb.Max[o] + child_1.Size[o]

        local merged_flags = bit32.bor(child_0.MergedFlags, child_1.MergedFlags)
        local no_resize_axis_flag = (axis == ImGuiAxis.X) and ImGuiDockNodeFlags.NoResizeX or ImGuiDockNodeFlags.NoResizeY
        if bit32.band(merged_flags, ImGuiDockNodeFlags.NoResize) ~= 0 or bit32.band(merged_flags, no_resize_axis_flag) ~= 0 then
            local window = g.CurrentWindow
            window.DrawList:AddRectFilled(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.Separator), g.Style.FrameRounding)
        else
            ImGui.PushID(node.ID)

            local touching_nodes = { [0] = {}, [1] = {} }
            local min_size = g.Style.WindowMinSize[a]
            local resize_limits = { [0] = node.ChildNodes[0].Pos[a] + min_size, [1] = node.ChildNodes[1].Pos[a] + node.ChildNodes[1].Size[a] - min_size }

            local splitter_id = ImGui.GetID("##Splitter")
            if g.ActiveId == splitter_id then
                DockNodeTreeUpdateSplitterFindTouchingNode(child_0, axis, 1, touching_nodes[0])
                DockNodeTreeUpdateSplitterFindTouchingNode(child_1, axis, 0, touching_nodes[1])
                for _, tn in ipairs(touching_nodes[0]) do
                    resize_limits[0] = ImMax(resize_limits[0], tn:Rect().Min[a] + min_size)
                end
                for _, tn in ipairs(touching_nodes[1]) do
                    resize_limits[1] = ImMin(resize_limits[1], tn:Rect().Max[a] - min_size)
                end
            end

            local cur_size_0 = child_0.Size[a]
            local cur_size_1 = child_1.Size[a]
            local min_size_0 = resize_limits[0] - child_0.Pos[a]
            local min_size_1 = child_1.Pos[a] + child_1.Size[a] - resize_limits[1]
            local bg_col = ImGui.GetColorU32(ImGuiCol.WindowBg)
            local changed
            changed, cur_size_0, cur_size_1 = ImGui.SplitterBehavior(bb, ImGui.GetID("##Splitter"), axis, cur_size_0, cur_size_1, min_size_0, min_size_1, g.WindowsBorderHoverPadding, WINDOWS_RESIZE_FROM_EDGES_FEEDBACK_TIMER, bg_col)
            if changed then
                if #touching_nodes[0] > 0 and #touching_nodes[1] > 0 then
                    child_0.Size[a] = cur_size_0; child_0.SizeRef[a] = cur_size_0
                    child_1.Pos[a] = child_1.Pos[a] - (cur_size_1 - child_1.Size[a])
                    child_1.Size[a] = cur_size_1; child_1.SizeRef[a] = cur_size_1

                    for side_n = 0, 1 do
                        for _, touching_node in ipairs(touching_nodes[side_n]) do
                            while touching_node.ParentNode ~= node do
                                if touching_node.ParentNode.SplitAxis == axis then
                                    local node_to_preserve = touching_node.ParentNode.ChildNodes[side_n]
                                    node_to_preserve.WantLockSizeOnce = true
                                end
                                touching_node = touching_node.ParentNode
                            end
                        end
                    end

                    ImGui.DockNodeTreeUpdatePosSize(child_0, child_0.Pos, child_0.Size)
                    ImGui.DockNodeTreeUpdatePosSize(child_1, child_1.Pos, child_1.Size)
                    ImGui.MarkIniSettingsDirty()
                end
            end
            ImGui.PopID()
        end
    end

    if child_0.IsVisible then ImGui.DockNodeTreeUpdateSplitter(child_0) end
    if child_1.IsVisible then ImGui.DockNodeTreeUpdateSplitter(child_1) end
end

function ImGui.DockNodeTreeFindFallbackLeafNode(node)
    if node:IsLeafNode() then return node end
    local leaf_node = ImGui.DockNodeTreeFindFallbackLeafNode(node.ChildNodes[0])
    if leaf_node then return leaf_node end
    leaf_node = ImGui.DockNodeTreeFindFallbackLeafNode(node.ChildNodes[1])
    if leaf_node then return leaf_node end
    return nil
end

function ImGui.DockNodeTreeFindVisibleNodeByPos(node, pos)
    if not node.IsVisible then return nil end
    local r = ImRect(node.Pos, node.Pos + node.Size)
    if not r:Contains(pos) then return nil end
    if node:IsLeafNode() then return node end
    local hovered_node = ImGui.DockNodeTreeFindVisibleNodeByPos(node.ChildNodes[0], pos)
    if hovered_node then return hovered_node end
    hovered_node = ImGui.DockNodeTreeFindVisibleNodeByPos(node.ChildNodes[1], pos)
    if hovered_node then return hovered_node end
    return node
end

---------------------------------------------------------------------------------------
-- Docking: Public Functions (SetWindowDock, DockSpace, DockSpaceOverViewport)
---------------------------------------------------------------------------------------

function ImGui.SetWindowDock(window, dock_id, cond)
    if cond and cond ~= 0 and bit32.band(window.SetWindowDockAllowFlags, cond) == 0 then return end
    window.SetWindowDockAllowFlags = bit32.band(window.SetWindowDockAllowFlags, bit32.bnot(bit32.bor(ImGuiCond.Once, ImGuiCond.FirstUseEver, ImGuiCond.Appearing)))

    if window.DockId == dock_id then return end

    local g = ImGui.GetCurrentContext()
    local new_node = ImGui.DockContextFindNodeByID(g, dock_id)
    if new_node and new_node:IsSplitNode() then
        new_node = ImGui.DockNodeGetRootNode(new_node)
        if new_node.CentralNode then
            IM_ASSERT(new_node.CentralNode:IsCentralNode())
            dock_id = new_node.CentralNode.ID
        else
            dock_id = new_node.LastFocusedNodeId
        end
    end

    if window.DockId == dock_id then return end

    if window.DockNode then ImGui.DockNodeRemoveWindow(window.DockNode, window, 0) end
    window.DockId = dock_id
end

function ImGui.DockSpace(dockspace_id, size_arg, flags, window_class)
    if size_arg == nil then size_arg = ImVec2(0, 0) end
    if flags == nil then flags = 0 end
    local g = ImGui.GetCurrentContext()
    local window = ImGui.GetCurrentWindowRead()
    if bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.DockingEnable) == 0 then return 0 end

    if window.SkipItems then flags = bit32.bor(flags, ImGuiDockNodeFlags.KeepAliveOnly) end
    if bit32.band(flags, ImGuiDockNodeFlags.KeepAliveOnly) == 0 then window = ImGui.GetCurrentWindow() end

    IM_ASSERT(bit32.band(flags, ImGuiDockNodeFlags.DockSpace) == 0)
    IM_ASSERT(bit32.band(flags, ImGuiDockNodeFlags.CentralNode) == 0)

    IM_ASSERT(dockspace_id ~= 0)
    local node = ImGui.DockContextFindNodeByID(g, dockspace_id)
    if node == nil then
        node = ImGui.DockContextAddNode(g, dockspace_id)
        node:SetLocalFlags(ImGuiDockNodeFlags.CentralNode)
    end
    node.SharedFlags = flags
    node.WindowClass = window_class or ImGuiWindowClass()

    if node.LastFrameActive == g.FrameCount and bit32.band(flags, ImGuiDockNodeFlags.KeepAliveOnly) == 0 then
        IM_ASSERT(node:IsDockSpace() == false, "Cannot call DockSpace() twice a frame with the same ID")
        node:SetLocalFlags(bit32.bor(node.LocalFlags, ImGuiDockNodeFlags.DockSpace))
        return dockspace_id
    end
    node:SetLocalFlags(bit32.bor(node.LocalFlags, ImGuiDockNodeFlags.DockSpace))

    if bit32.band(flags, ImGuiDockNodeFlags.KeepAliveOnly) ~= 0 then
        node.LastFrameAlive = g.FrameCount
        return dockspace_id
    end

    local content_avail = ImGui.GetContentRegionAvail()
    local size = ImVec2(ImTrunc(size_arg.x), ImTrunc(size_arg.y))
    if size.x <= 0.0 then size.x = ImMax(content_avail.x + size.x, 4.0) end
    if size.y <= 0.0 then size.y = ImMax(content_avail.y + size.y, 4.0) end
    IM_ASSERT(size.x > 0.0 and size.y > 0.0)

    node.Pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y)
    node.Size = ImVec2(size.x, size.y)
    node.SizeRef = ImVec2(size.x, size.y)
    ImGui.SetNextWindowPos(node.Pos)
    ImGui.SetNextWindowSize(node.Size)
    g.NextWindowData.PosUndock = false

    local window_flags = bit32.bor(ImGuiWindowFlags.ChildWindow, ImGuiWindowFlags.DockNodeHost)
    window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoSavedSettings, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoCollapse, ImGuiWindowFlags.NoTitleBar)
    window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoScrollbar, ImGuiWindowFlags.NoScrollWithMouse)
    window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoBackground)

    local title = string.format("%s/DockSpace_%08X", window.Name, dockspace_id)

    ImGui.PushStyleVar(ImGuiStyleVar.ChildBorderSize, 0.0)
    ImGui.Begin(title, nil, window_flags)
    ImGui.PopStyleVar()

    local host_window = g.CurrentWindow
    DockNodeSetupHostWindow(node, host_window)
    host_window.ChildId = window:GetID(title)
    node.OnlyNodeWithWindows = nil

    IM_ASSERT(node:IsRootNode())

    if node:IsLeafNode() and not node:IsCentralNode() then
        node:SetLocalFlags(bit32.bor(node.LocalFlags, ImGuiDockNodeFlags.CentralNode))
    end

    ImGui.DockNodeUpdate(node)

    ImGui.End()

    local bb = ImRect(node.Pos, node.Pos + size)
    ImGui.ItemSize(size)
    ImGui.ItemAdd(bb, dockspace_id, nil, ImGuiItemFlags.NoNav)
    if bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredRect) ~= 0 and ImGui.IsWindowChildOf(g.HoveredWindow, host_window, false, true) then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredWindow)
    end

    return dockspace_id
end

function ImGui.DockSpaceOverViewport(dockspace_id, viewport, dockspace_flags, window_class)
    if dockspace_id == nil then dockspace_id = 0 end
    if dockspace_flags == nil then dockspace_flags = 0 end
    if viewport == nil then viewport = ImGui.GetMainViewport() end

    ImGui.SetNextWindowPos(viewport.WorkPos)
    ImGui.SetNextWindowSize(viewport.WorkSize)
    ImGui.SetNextWindowViewport(viewport.ID)

    local host_window_flags = 0
    host_window_flags = bit32.bor(host_window_flags, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoCollapse, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoDocking)
    host_window_flags = bit32.bor(host_window_flags, ImGuiWindowFlags.NoBringToFrontOnFocus, ImGuiWindowFlags.NoNavFocus)
    if bit32.band(dockspace_flags, ImGuiDockNodeFlags.PassthruCentralNode) ~= 0 then
        host_window_flags = bit32.bor(host_window_flags, ImGuiWindowFlags.NoBackground)
    end
    if bit32.band(dockspace_flags, ImGuiDockNodeFlags.KeepAliveOnly) ~= 0 then
        host_window_flags = bit32.bor(host_window_flags, ImGuiWindowFlags.NoMouseInputs)
    end

    local label = string.format("WindowOverViewport_%08X", viewport.ID)

    ImGui.PushStyleVar(ImGuiStyleVar.WindowRounding, 0.0)
    ImGui.PushStyleVar(ImGuiStyleVar.WindowBorderSize, 0.0)
    ImGui.PushStyleVar(ImGuiStyleVar.WindowPadding, ImVec2(0.0, 0.0))
    ImGui.Begin(label, nil, host_window_flags)
    ImGui.PopStyleVar(3)

    if dockspace_id == 0 then dockspace_id = ImGui.GetID("DockSpace") end
    ImGui.DockSpace(dockspace_id, ImVec2(0.0, 0.0), dockspace_flags, window_class)

    ImGui.End()

    return dockspace_id
end

---------------------------------------------------------------------------------------
-- Docking: Builder Functions
---------------------------------------------------------------------------------------

function ImGui.DockBuilderDockWindow(window_name, node_id)
    local window_id = ImHashStr(window_name)
    local window = ImGui.FindWindowByID(window_id)
    if window then
        local prev_node_id = window.DockId
        ImGui.SetWindowDock(window, node_id, ImGuiCond.Always)
        if window.DockId ~= prev_node_id then window.DockOrder = -1 end
    else
        local settings = ImGui.FindWindowSettingsByID(window_id)
        if settings == nil then settings = ImGui.CreateNewWindowSettings(window_name) end
        if settings.DockId ~= node_id then settings.DockOrder = -1 end
        settings.DockId = node_id
    end
end

function ImGui.DockBuilderGetNode(node_id)
    return ImGui.DockContextFindNodeByID(ImGui.GetCurrentContext(), node_id)
end

function ImGui.DockBuilderGetCentralNode(node_id)
    local node = ImGui.DockBuilderGetNode(node_id)
    if not node then return nil end
    return ImGui.DockNodeGetRootNode(node).CentralNode
end

function ImGui.DockBuilderSetNodePos(node_id, pos)
    local node = ImGui.DockContextFindNodeByID(ImGui.GetCurrentContext(), node_id)
    if node == nil then return end
    node.Pos = ImVec2(pos.x, pos.y)
    node.AuthorityForPos = ImGuiDataAuthority.DockNode
end

function ImGui.DockBuilderSetNodeSize(node_id, size)
    local node = ImGui.DockContextFindNodeByID(ImGui.GetCurrentContext(), node_id)
    if node == nil then return end
    IM_ASSERT(size.x > 0.0 and size.y > 0.0)
    node.Size = ImVec2(size.x, size.y)
    node.SizeRef = ImVec2(size.x, size.y)
    node.AuthorityForSize = ImGuiDataAuthority.DockNode
end

function ImGui.DockBuilderAddNode(node_id, flags)
    if node_id == nil then node_id = 0 end
    if flags == nil then flags = 0 end
    local g = ImGui.GetCurrentContext()
    if node_id ~= 0 then ImGui.DockBuilderRemoveNode(node_id) end

    local node
    if bit32.band(flags, ImGuiDockNodeFlags.DockSpace) ~= 0 then
        ImGui.DockSpace(node_id, ImVec2(0, 0), bit32.bor(bit32.band(flags, bit32.bnot(ImGuiDockNodeFlags.DockSpace)), ImGuiDockNodeFlags.KeepAliveOnly))
        node = ImGui.DockContextFindNodeByID(g, node_id)
    else
        node = ImGui.DockContextAddNode(g, node_id)
        node:SetLocalFlags(flags)
    end
    node.LastFrameAlive = g.FrameCount
    return node.ID
end

function ImGui.DockBuilderRemoveNode(node_id)
    local g = ImGui.GetCurrentContext()
    local node = ImGui.DockContextFindNodeByID(g, node_id)
    if node == nil then return end
    ImGui.DockBuilderRemoveNodeDockedWindows(node_id, true)
    ImGui.DockBuilderRemoveNodeChildNodes(node_id)
    node = ImGui.DockContextFindNodeByID(g, node_id)
    if node == nil then return end
    if node:IsCentralNode() and node.ParentNode then
        node.ParentNode:SetLocalFlags(bit32.bor(node.ParentNode.LocalFlags, ImGuiDockNodeFlags.CentralNode))
    end
    ImGui.DockContextRemoveNode(g, node, true)
end

function ImGui.DockBuilderRemoveNodeChildNodes(root_id)
    local g = ImGui.GetCurrentContext()
    local dc = g.DockContext

    local root_node = (root_id ~= 0) and ImGui.DockContextFindNodeByID(g, root_id) or nil
    if root_id ~= 0 and root_node == nil then return end
    local has_central_node = false

    local backup_root_node_authority_for_pos = root_node and root_node.AuthorityForPos or ImGuiDataAuthority.Auto
    local backup_root_node_authority_for_size = root_node and root_node.AuthorityForSize or ImGuiDataAuthority.Auto

    local nodes_to_remove = {}
    for _, id in ipairs(DockContextNodesSorted(g)) do
        local node = dc.Nodes[id]
        if node then
            local want_removal = (root_id == 0) or (node.ID ~= root_id and ImGui.DockNodeGetRootNode(node).ID == root_id)
            if want_removal then
                if node:IsCentralNode() then has_central_node = true end
                if root_id ~= 0 then ImGui.DockContextQueueNotifyRemovedNode(g, node) end
                if root_node then
                    ImGui.DockNodeMoveWindows(root_node, node)
                    DockSettingsRenameNodeReferences(node.ID, root_node.ID)
                end
                table.insert(nodes_to_remove, node)
            end
        end
    end

    if root_node then
        root_node.AuthorityForPos = backup_root_node_authority_for_pos
        root_node.AuthorityForSize = backup_root_node_authority_for_size
    end

    for _, settings in g.SettingsWindows:iter() do
        local window_settings_dock_id = settings.DockId
        if window_settings_dock_id and window_settings_dock_id ~= 0 then
            for _, n in ipairs(nodes_to_remove) do
                if n.ID == window_settings_dock_id then
                    settings.DockId = root_id
                    break
                end
            end
        end
    end

    if #nodes_to_remove > 1 then
        local depth = {}
        for _, n in ipairs(nodes_to_remove) do depth[n] = ImGui.DockNodeGetDepth(n) end
        table.sort(nodes_to_remove, function(a, b) return depth[a] > depth[b] end)
    end
    for _, n in ipairs(nodes_to_remove) do
        ImGui.DockContextRemoveNode(g, n, false)
    end

    if root_id == 0 then
        dc.Nodes = {}
        dc.Requests:clear()
    elseif has_central_node then
        root_node.CentralNode = root_node
        root_node:SetLocalFlags(bit32.bor(root_node.LocalFlags, ImGuiDockNodeFlags.CentralNode))
    end
end

function ImGui.DockBuilderRemoveNodeDockedWindows(root_id, clear_settings_refs)
    if clear_settings_refs == nil then clear_settings_refs = true end
    local g = ImGui.GetCurrentContext()
    if clear_settings_refs then
        for _, settings in g.SettingsWindows:iter() do
            local want_removal = (root_id == 0) or (settings.DockId == root_id)
            if not want_removal and settings.DockId ~= 0 then
                local node = ImGui.DockContextFindNodeByID(g, settings.DockId)
                if node and ImGui.DockNodeGetRootNode(node).ID == root_id then want_removal = true end
            end
            if want_removal then settings.DockId = 0 end
        end
    end

    for n = 1, g.Windows.Size do
        local window = g.Windows.Data[n]
        local want_removal = (root_id == 0) or (window.DockNode and ImGui.DockNodeGetRootNode(window.DockNode).ID == root_id) or (window.DockNodeAsHost and window.DockNodeAsHost.ID == root_id)
        if want_removal then
            local backup_dock_id = window.DockId
            ImGui.DockContextProcessUndockWindow(g, window, clear_settings_refs)
            if not clear_settings_refs then IM_ASSERT(window.DockId == backup_dock_id) end
        end
    end
end

--- @return ImGuiID id_at_dir, ImGuiID id_at_opposite_dir
function ImGui.DockBuilderSplitNode(id, split_dir, size_ratio_for_node_at_dir)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(split_dir ~= ImGuiDir.None)

    local node = ImGui.DockContextFindNodeByID(g, id)
    if node == nil then
        IM_ASSERT(node ~= nil)
        return 0, 0
    end

    local req = ImGuiDockRequest()
    req.Type = ImGuiDockRequestType.Split
    req.DockTargetWindow = nil
    req.DockTargetNode = node
    req.DockPayload = nil
    req.DockSplitDir = split_dir
    req.DockSplitRatio = ImSaturate((split_dir == ImGuiDir.Left or split_dir == ImGuiDir.Up) and size_ratio_for_node_at_dir or (1.0 - size_ratio_for_node_at_dir))
    req.DockSplitOuter = false
    ImGui.DockContextProcessDock(g, req)

    local first = (split_dir == ImGuiDir.Left or split_dir == ImGuiDir.Up)
    local id_at_dir = node.ChildNodes[first and 0 or 1].ID
    local id_at_opposite_dir = node.ChildNodes[first and 1 or 0].ID
    return id_at_dir, id_at_opposite_dir
end

local function DockBuilderCopyNodeRec(src_node, dst_node_id_if_known, out_node_remap_pairs)
    local g = ImGui.GetCurrentContext()
    local dst_node = ImGui.DockContextAddNode(g, dst_node_id_if_known)
    dst_node.SharedFlags = src_node.SharedFlags
    dst_node.LocalFlags = src_node.LocalFlags
    dst_node.LocalFlagsInWindows = ImGuiDockNodeFlags.None
    dst_node.Pos = ImVec2(src_node.Pos.x, src_node.Pos.y)
    dst_node.Size = ImVec2(src_node.Size.x, src_node.Size.y)
    dst_node.SizeRef = ImVec2(src_node.SizeRef.x, src_node.SizeRef.y)
    dst_node.SplitAxis = src_node.SplitAxis
    dst_node:UpdateMergedFlags()

    table.insert(out_node_remap_pairs, src_node.ID)
    table.insert(out_node_remap_pairs, dst_node.ID)

    for child_n = 0, 1 do
        if src_node.ChildNodes[child_n] then
            dst_node.ChildNodes[child_n] = DockBuilderCopyNodeRec(src_node.ChildNodes[child_n], 0, out_node_remap_pairs)
            dst_node.ChildNodes[child_n].ParentNode = dst_node
        end
    end
    return dst_node
end

--- @param out_node_remap_pairs table # 1-based array, cleared and filled with (src_id, dst_id) pairs
function ImGui.DockBuilderCopyNode(src_node_id, dst_node_id, out_node_remap_pairs)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(src_node_id ~= 0)
    IM_ASSERT(dst_node_id ~= 0)
    IM_ASSERT(out_node_remap_pairs ~= nil)

    ImGui.DockBuilderRemoveNode(dst_node_id)

    local src_node = ImGui.DockContextFindNodeByID(g, src_node_id)
    IM_ASSERT(src_node ~= nil)

    for k in pairs(out_node_remap_pairs) do out_node_remap_pairs[k] = nil end
    DockBuilderCopyNodeRec(src_node, dst_node_id, out_node_remap_pairs)
    IM_ASSERT((#out_node_remap_pairs % 2) == 0)
end

function ImGui.DockBuilderCopyWindowSettings(src_name, dst_name)
    local src_window = ImGui.FindWindowByName(src_name)
    if src_window == nil then return end
    local dst_window = ImGui.FindWindowByName(dst_name)
    if dst_window then
        ImVec2_Copy(dst_window.Pos, src_window.Pos)
        ImVec2_Copy(dst_window.Size, src_window.Size)
        ImVec2_Copy(dst_window.SizeFull, src_window.SizeFull)
        dst_window.Collapsed = src_window.Collapsed
    else
        local dst_settings = ImGui.FindWindowSettingsByID(ImHashStr(dst_name))
        if not dst_settings then dst_settings = ImGui.CreateNewWindowSettings(dst_name) end
        local wx, wy = ImTrunc(src_window.Pos.x), ImTrunc(src_window.Pos.y)
        if src_window.ViewportId ~= 0 and src_window.ViewportId ~= 0x11111111 then
            ImVec2_CopyV(dst_settings.ViewportPos, wx, wy)
            dst_settings.ViewportId = src_window.ViewportId
            ImVec2_CopyV(dst_settings.Pos, 0, 0)
        else
            ImVec2_CopyV(dst_settings.Pos, wx, wy)
        end
        ImVec2_CopyV(dst_settings.Size, ImTrunc(src_window.SizeFull.x), ImTrunc(src_window.SizeFull.y))
        dst_settings.Collapsed = src_window.Collapsed
    end
end

--- @param in_window_remap_pairs table # 1-based array of window names: src0, dst0, src1, dst1, ...
function ImGui.DockBuilderCopyDockSpace(src_dockspace_id, dst_dockspace_id, in_window_remap_pairs)
    IM_ASSERT(src_dockspace_id ~= 0)
    IM_ASSERT(dst_dockspace_id ~= 0)
    IM_ASSERT(in_window_remap_pairs ~= nil)
    IM_ASSERT((#in_window_remap_pairs % 2) == 0)

    local node_remap_pairs = {}
    ImGui.DockBuilderCopyNode(src_dockspace_id, dst_dockspace_id, node_remap_pairs)

    local src_windows = {}
    for remap_window_n = 1, #in_window_remap_pairs, 2 do
        local src_window_name = in_window_remap_pairs[remap_window_n]
        local dst_window_name = in_window_remap_pairs[remap_window_n + 1]
        local src_window_id = ImHashStr(src_window_name)
        src_windows[src_window_id] = true

        local src_dock_id = 0
        local src_window = ImGui.FindWindowByID(src_window_id)
        if src_window then
            src_dock_id = src_window.DockId
        else
            local src_window_settings = ImGui.FindWindowSettingsByID(src_window_id)
            if src_window_settings then src_dock_id = src_window_settings.DockId end
        end
        local dst_dock_id = 0
        for dock_remap_n = 1, #node_remap_pairs, 2 do
            if node_remap_pairs[dock_remap_n] == src_dock_id then
                dst_dock_id = node_remap_pairs[dock_remap_n + 1]
                break
            end
        end

        if dst_dock_id ~= 0 then
            ImGui.DockBuilderDockWindow(dst_window_name, dst_dock_id)
        else
            ImGui.DockBuilderCopyWindowSettings(src_window_name, dst_window_name)
        end
    end

    local dock_remaining_windows = {}
    for dock_remap_n = 1, #node_remap_pairs, 2 do
        local src_dock_id = node_remap_pairs[dock_remap_n]
        if src_dock_id ~= 0 then
            local dst_dock_id = node_remap_pairs[dock_remap_n + 1]
            local node = ImGui.DockBuilderGetNode(src_dock_id)
            for _, window in node.Windows:iter() do
                if not src_windows[window.ID] then
                    table.insert(dock_remaining_windows, { Window = window, DockId = dst_dock_id })
                end
            end
        end
    end
    for _, task in ipairs(dock_remaining_windows) do
        ImGui.DockBuilderDockWindow(task.Window.Name, task.DockId)
    end
end

function ImGui.DockBuilderFinish(root_id)
    ImGui.DockContextBuildAddWindowsToNodes(ImGui.GetCurrentContext(), root_id)
end

---------------------------------------------------------------------------------------
-- Docking: Begin/End Support Functions (called from Begin/End)
---------------------------------------------------------------------------------------

function ImGui.GetWindowAlwaysWantOwnTabBar(window)
    local g = ImGui.GetCurrentContext()
    if g.IO.ConfigDockingAlwaysTabBar or window.WindowClass.DockingAlwaysTabBar then
        if bit32.band(window.Flags, bit32.bor(ImGuiWindowFlags.ChildWindow, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoDocking)) == 0 then
            if not window.IsFallbackWindow then return true end
        end
    end
    return false
end

function ImGui.DockContextBindNodeToWindow(ctx, window)
    local g = ctx
    local node = ImGui.DockContextFindNodeByID(ctx, window.DockId)
    IM_ASSERT(window.DockNode == nil)

    if node and node:IsSplitNode() then
        ImGui.DockContextProcessUndockWindow(ctx, window)
        return nil
    end

    if node == nil then
        node = ImGui.DockContextAddNode(ctx, window.DockId)
        node.AuthorityForPos = ImGuiDataAuthority.Window
        node.AuthorityForSize = ImGuiDataAuthority.Window
        node.AuthorityForViewport = ImGuiDataAuthority.Window
        node.LastFrameAlive = g.FrameCount
    end

    if not node.IsVisible then
        local ancestor_node = node
        while not ancestor_node.IsVisible and ancestor_node.ParentNode do
            ancestor_node = ancestor_node.ParentNode
        end
        IM_ASSERT(ancestor_node.Size.x > 0.0 and ancestor_node.Size.y > 0.0)
        ImGui.DockNodeUpdateHasCentralNodeChild(ImGui.DockNodeGetRootNode(ancestor_node))
        ImGui.DockNodeTreeUpdatePosSize(ancestor_node, ancestor_node.Pos, ancestor_node.Size, node)
    end

    local node_was_visible = node.IsVisible
    ImGui.DockNodeAddWindow(node, window, true)
    node.IsVisible = node_was_visible
    IM_ASSERT(node == window.DockNode)
    return node
end

local function StoreDockStyleForWindow(window)
    local g = ImGui.GetCurrentContext()
    for color_n = 0, ImGuiWindowDockStyleCol.COUNT - 1 do
        window.DockStyle.Colors[color_n] = ImGui.ColorConvertFloat4ToU32(g.Style.Colors[GWindowDockStyleColors[color_n]])
    end
end
ImGui.StoreDockStyleForWindow = StoreDockStyleForWindow

--- @return bool? p_open
function ImGui.BeginDocked(window, p_open)
    local g = ImGui.GetCurrentContext()

    if window.IsFallbackWindow and not window.WasActive then
        DockNodeHideWindowDuringHostWindowCreation(window)
        return p_open
    end

    local auto_dock_node = ImGui.GetWindowAlwaysWantOwnTabBar(window)
    if auto_dock_node then
        if window.DockId == 0 then
            IM_ASSERT(window.DockNode == nil)
            window.DockId = ImGui.DockContextGenNodeID(g)
        end
    else
        local want_undock = false
        want_undock = want_undock or bit32.band(window.Flags, ImGuiWindowFlags.NoDocking) ~= 0
        want_undock = want_undock or (bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasPos) ~= 0 and bit32.band(window.SetWindowPosAllowFlags, g.NextWindowData.PosCond) ~= 0 and g.NextWindowData.PosUndock)
        if want_undock then
            ImGui.DockContextProcessUndockWindow(g, window)
            return p_open
        end
    end

    local node = window.DockNode
    if node ~= nil then IM_ASSERT(window.DockId == node.ID) end
    if window.DockId ~= 0 and node == nil then
        node = ImGui.DockContextBindNodeToWindow(g, window)
        if node == nil then return p_open end
    end

    if node.LastFrameAlive < g.FrameCount then
        local root_node = ImGui.DockNodeGetRootNode(node)
        if root_node.LastFrameAlive < g.FrameCount then
            ImGui.DockContextProcessUndockWindow(g, window)
        else
            window.DockIsActive = true
        end
        return p_open
    end

    StoreDockStyleForWindow(window)

    if node.HostWindow == nil then
        if node.State == ImGuiDockNodeState.HostWindowHiddenBecauseWindowsAreResizing then
            window.DockIsActive = true
        end
        if node.Windows.Size > 1 and window.Appearing then
            DockNodeHideWindowDuringHostWindowCreation(window)
        end
        return p_open
    end

    IM_ASSERT(node.HostWindow)
    IM_ASSERT(node:IsLeafNode())
    IM_ASSERT(node.Size.x >= 0.0 and node.Size.y >= 0.0)
    node.State = ImGuiDockNodeState.HostWindowVisible

    if bit32.band(node.MergedFlags, ImGuiDockNodeFlags.KeepAliveOnly) == 0 and window.BeginOrderWithinContext < node.HostWindow.BeginOrderWithinContext then
        ImGui.DockContextProcessUndockWindow(g, window)
        return p_open
    end

    ImGui.SetNextWindowPos(node.Pos)
    ImGui.SetNextWindowSize(node.Size)
    g.NextWindowData.PosUndock = false
    window.DockIsActive = true
    window.DockNodeIsVisible = true
    window.DockTabIsVisible = false
    if bit32.band(node.MergedFlags, ImGuiDockNodeFlags.KeepAliveOnly) ~= 0 then return p_open end

    if node.VisibleWindow == window then window.DockTabIsVisible = true end

    IM_ASSERT(bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) == 0)
    window.Flags = bit32.bor(window.Flags, ImGuiWindowFlags.ChildWindow, ImGuiWindowFlags.NoResize)
    window.ChildFlags = bit32.bor(window.ChildFlags, ImGuiChildFlags.AlwaysUseWindowPadding)
    if node:IsHiddenTabBar() or node:IsNoTabBar() then
        window.Flags = bit32.bor(window.Flags, ImGuiWindowFlags.NoTitleBar)
    else
        window.Flags = bit32.band(window.Flags, bit32.bnot(ImGuiWindowFlags.NoTitleBar))
    end

    if node.TabBar and window.WasActive then
        window.DockOrder = ImGui.DockNodeGetTabOrder(window)
    end

    if (node.WantCloseAll or node.WantCloseTabId == window.TabId) and p_open ~= nil then
        p_open = false
    end

    local parent_window = window.DockNode.HostWindow
    window.ChildId = parent_window:GetID(window.Name)
    return p_open
end

function ImGui.BeginDockableDragDropSource(window)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(g.ActiveId == window.MoveId)
    IM_ASSERT(g.MovingWindow == window)
    IM_ASSERT(g.CurrentWindow == window)

    if g.IO.ConfigDockingWithShift ~= g.IO.KeyShift then
        if g.IO.ConfigDockingWithShift and g.MouseStationaryTimer >= 1.0 and g.ActiveId >= 1 then
            ImGui.SetTooltip("%s", ImGui.LocalizeGetMsg(ImGuiLocKey.DockingHoldShiftToDock))
        end
        return
    end

    g.LastItemData.ID = window.MoveId
    window = window.RootWindowDockTree
    IM_ASSERT(bit32.band(window.Flags, ImGuiWindowFlags.NoDocking) == 0)
    local is_drag_docking = g.IO.ConfigDockingWithShift or ImRect(0, 0, window.SizeFull.x, ImGui.GetFrameHeight()):Contains(g.ActiveIdClickOffset)
    local drag_drop_flags = bit32.bor(ImGuiDragDropFlags.SourceNoPreviewTooltip, ImGuiDragDropFlags.SourceNoHoldToOpenOthers, ImGuiDragDropFlags.PayloadAutoExpire, ImGuiDragDropFlags.PayloadNoCrossContext, ImGuiDragDropFlags.PayloadNoCrossProcess)
    if is_drag_docking and ImGui.BeginDragDropSource(drag_drop_flags) then
        ImGui.SetDragDropPayload(IMGUI_PAYLOAD_TYPE_WINDOW, window)
        ImGui.EndDragDropSource()
        StoreDockStyleForWindow(window)
    end
end

function ImGui.BeginDockableDragDropTarget(window)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(bit32.band(window.Flags, ImGuiWindowFlags.NoDocking) == 0)
    if not g.DragDropActive then return end
    if not ImGui.BeginDragDropTargetCustom(window:Rect(), window.ID) then return end

    local payload = g.DragDropPayload
    if not ImGuiPayload_IsDataType(payload, IMGUI_PAYLOAD_TYPE_WINDOW) or not ImGui.DockNodeIsDropAllowed(window, payload.Data) then
        ImGui.EndDragDropTarget()
        return
    end

    local payload_window = payload.Data
    if ImGui.AcceptDragDropPayload(IMGUI_PAYLOAD_TYPE_WINDOW, bit32.bor(ImGuiDragDropFlags.AcceptBeforeDelivery, ImGuiDragDropFlags.AcceptNoDrawDefaultRect)) then
        local dock_into_floating_window = false
        local node = nil
        if window.DockNodeAsHost then
            node = ImGui.DockNodeTreeFindVisibleNodeByPos(window.DockNodeAsHost, g.IO.MousePos)
            if node and node:IsDockSpace() and node:IsRootNode() then
                node = (node.CentralNode and node:IsLeafNode()) and node.CentralNode or ImGui.DockNodeTreeFindFallbackLeafNode(node)
            end
        else
            if window.DockNode then
                node = window.DockNode
            else
                dock_into_floating_window = true
            end
        end

        local explicit_target_rect
        if node and node.TabBar and not node:IsHiddenTabBar() and not node:IsNoTabBar() then
            explicit_target_rect = node.TabBar.BarRect
        else
            explicit_target_rect = ImRect(window.Pos, window.Pos + ImVec2(window.Size.x, ImGui.GetFrameHeight()))
        end
        local is_explicit_target = g.IO.ConfigDockingWithShift or ImGui.IsMouseHoveringRect(explicit_target_rect.Min, explicit_target_rect.Max)

        local do_preview = ImGuiPayload_IsPreview(payload) or ImGuiPayload_IsDelivery(payload)
        if do_preview and (node ~= nil or dock_into_floating_window) then
            local split_inner = ImGuiDockPreviewData()
            local split_outer = ImGuiDockPreviewData()
            local split_data = split_inner
            if node and (node.ParentNode or node:IsCentralNode() or not node:IsLeafNode()) then
                local root_node = ImGui.DockNodeGetRootNode(node)
                if root_node then
                    ImGui.DockNodePreviewDockSetup(window, root_node, payload_window, nil, split_outer, is_explicit_target, true)
                    if split_outer.IsSplitDirExplicit then split_data = split_outer end
                end
            end
            if not node or node:IsLeafNode() then
                ImGui.DockNodePreviewDockSetup(window, node, payload_window, nil, split_inner, is_explicit_target, false)
            end
            if split_data == split_outer then split_inner.IsDropAllowed = false end

            ImGui.DockNodePreviewDockRender(window, node, payload_window, split_inner)
            ImGui.DockNodePreviewDockRender(window, node, payload_window, split_outer)

            if split_data.IsDropAllowed and ImGuiPayload_IsDelivery(payload) then
                ImGui.DockContextQueueDock(g, window, split_data.SplitNode, payload_window, split_data.SplitDir, split_data.SplitRatio, split_data == split_outer)
            end
        end
    end
    ImGui.EndDragDropTarget()
end

---------------------------------------------------------------------------------------
-- Docking: Settings
---------------------------------------------------------------------------------------

DockSettingsRenameNodeReferences = function(old_node_id, new_node_id)
    local g = ImGui.GetCurrentContext()
    for _, window in g.Windows:iter() do
        if window.DockId == old_node_id and window.DockNode == nil then window.DockId = new_node_id end
    end
    for _, settings in g.SettingsWindows:iter() do
        if settings.DockId == old_node_id then settings.DockId = new_node_id end
    end
end

--- @param node_ids table # 1-based array
DockSettingsRemoveNodeReferences = function(node_ids, node_ids_count)
    local g = ImGui.GetCurrentContext()
    local found = 0
    for _, settings in g.SettingsWindows:iter() do
        for node_n = 1, node_ids_count do
            if settings.DockId == node_ids[node_n] then
                settings.DockId = 0
                settings.DockOrder = -1
                found = found + 1
                if found < node_ids_count then break end
                return
            end
        end
    end
end

DockSettingsFindNodeSettings = function(ctx, id)
    for _, s in ctx.DockContext.NodesSettings:iter() do
        if s.ID == id then return s end
    end
    return nil
end

DockSettingsHandler_ClearAll = function(ctx, handler)
    local dc = ctx.DockContext
    dc.NodesSettings:clear()
    ImGui.DockContextClearNodes(ctx, 0, true)
end

DockSettingsHandler_ApplyAll = function(ctx, handler)
    local dc = ctx.DockContext
    if ctx.Windows.Size == 0 then ImGui.DockContextPruneUnusedSettingsNodes(ctx) end
    ImGui.DockContextBuildNodesFromSettings(ctx, dc.NodesSettings.Data or {}, dc.NodesSettings.Size)
    ImGui.DockContextBuildAddWindowsToNodes(ctx, 0)
end

DockSettingsHandler_ReadOpen = function(ctx, handler, name)
    if name ~= "Data" then return nil end
    return true
end

DockSettingsHandler_ReadLine = function(ctx, handler, entry, line)
    local node = ImGuiDockNodeSettings()
    line = line:gsub("^[ \t]+", "")
    if line:sub(1, 8) == "DockNode" then
        line = line:sub(9)
    elseif line:sub(1, 9) == "DockSpace" then
        line = line:sub(10)
        node.Flags = bit32.bor(node.Flags, ImGuiDockNodeFlags.DockSpace)
    else
        return
    end
    line = line:gsub("^[ \t]+", "")
    local function take(pattern)
        local caps = { line:match("^" .. pattern .. "()") }
        if #caps == 0 then return nil end
        line = line:sub(caps[#caps])
        caps[#caps] = nil
        return table.unpack(caps)
    end
    local v = take("ID=0x(%x+)")
    if not v then return end
    node.ID = tonumber(v, 16)
    v = take(" Parent=0x(%x+)")
    if v then node.ParentNodeId = tonumber(v, 16); if node.ParentNodeId == 0 then return end end
    v = take(" Window=0x(%x+)")
    if v then node.ParentWindowId = tonumber(v, 16); if node.ParentWindowId == 0 then return end end
    if node.ParentNodeId == 0 then
        local x, y = take(" Pos=(%-?%d+),(%-?%d+)")
        if not x then return end
        node.Pos = ImVec2(tonumber(x), tonumber(y))
        x, y = take(" Size=(%-?%d+),(%-?%d+)")
        if not x then return end
        node.Size = ImVec2(tonumber(x), tonumber(y))
    else
        local x, y = take(" SizeRef=(%-?%d+),(%-?%d+)")
        if x then node.SizeRef = ImVec2(tonumber(x), tonumber(y)) end
    end
    local c = take(" Split=(%a)")
    if c then
        if c == "X" then node.SplitAxis = ImGuiAxis.X elseif c == "Y" then node.SplitAxis = ImGuiAxis.Y end
    end
    local function flag(name, f)
        local x = take(" " .. name .. "=(%-?%d+)")
        if x and tonumber(x) ~= 0 then node.Flags = bit32.bor(node.Flags, f) end
    end
    flag("NoResize", ImGuiDockNodeFlags.NoResize)
    flag("CentralNode", ImGuiDockNodeFlags.CentralNode)
    flag("NoTabBar", ImGuiDockNodeFlags.NoTabBar)
    flag("HiddenTabBar", ImGuiDockNodeFlags.HiddenTabBar)
    flag("NoWindowMenuButton", ImGuiDockNodeFlags.NoWindowMenuButton)
    flag("NoCloseButton", ImGuiDockNodeFlags.NoCloseButton)
    v = take(" Selected=0x(%x+)")
    if v then node.SelectedTabId = tonumber(v, 16) end
    if node.ParentNodeId ~= 0 then
        local parent_settings = DockSettingsFindNodeSettings(ctx, node.ParentNodeId)
        if parent_settings then node.Depth = parent_settings.Depth + 1 end
    end
    ctx.DockContext.NodesSettings:push_back(node)
end

local function DockSettingsHandler_DockNodeToSettings(dc, node, depth)
    local node_settings = ImGuiDockNodeSettings()
    node_settings.ID = node.ID
    node_settings.ParentNodeId = node.ParentNode and node.ParentNode.ID or 0
    node_settings.ParentWindowId = (node:IsDockSpace() and node.HostWindow and node.HostWindow.ParentWindow) and node.HostWindow.ParentWindow.ID or 0
    node_settings.SelectedTabId = node.SelectedTabId
    node_settings.SplitAxis = node:IsSplitNode() and node.SplitAxis or ImGuiAxis.None
    node_settings.Depth = depth
    node_settings.Flags = bit32.band(node.LocalFlags, ImGuiDockNodeFlags.SavedFlagsMask_)
    node_settings.Pos = ImVec2(ImTrunc(node.Pos.x), ImTrunc(node.Pos.y))
    node_settings.Size = ImVec2(ImTrunc(node.Size.x), ImTrunc(node.Size.y))
    node_settings.SizeRef = ImVec2(ImTrunc(node.SizeRef.x), ImTrunc(node.SizeRef.y))
    dc.NodesSettings:push_back(node_settings)
    if node.ChildNodes[0] then DockSettingsHandler_DockNodeToSettings(dc, node.ChildNodes[0], depth + 1) end
    if node.ChildNodes[1] then DockSettingsHandler_DockNodeToSettings(dc, node.ChildNodes[1], depth + 1) end
end

DockSettingsHandler_WriteAll = function(ctx, handler, buf)
    local g = ctx
    local dc = ctx.DockContext
    if bit32.band(g.IO.ConfigFlags, ImGuiConfigFlags.DockingEnable) == 0 then return end

    dc.NodesSettings:resize(0)
    for _, id in ipairs(DockContextNodesSorted(ctx)) do
        local node = dc.Nodes[id]
        if node and node:IsRootNode() then
            DockSettingsHandler_DockNodeToSettings(dc, node, 0)
        end
    end

    local max_depth = 0
    for _, s in dc.NodesSettings:iter() do max_depth = ImMax(s.Depth, max_depth) end

    buf:appendf("[%s][Data]\n", handler.TypeName)
    for _, s in dc.NodesSettings:iter() do
        buf:append(string.rep(" ", s.Depth * 2) .. ((bit32.band(s.Flags, ImGuiDockNodeFlags.DockSpace) ~= 0) and "DockSpace" or "DockNode ") .. string.rep(" ", (max_depth - s.Depth) * 2))
        buf:appendf(" ID=0x%08X", s.ID)
        if s.ParentNodeId ~= 0 then
            buf:appendf(" Parent=0x%08X SizeRef=%d,%d", s.ParentNodeId, s.SizeRef.x, s.SizeRef.y)
        else
            if s.ParentWindowId ~= 0 then buf:appendf(" Window=0x%08X", s.ParentWindowId) end
            buf:appendf(" Pos=%d,%d Size=%d,%d", s.Pos.x, s.Pos.y, s.Size.x, s.Size.y)
        end
        if s.SplitAxis ~= ImGuiAxis.None then buf:appendf(" Split=%s", (s.SplitAxis == ImGuiAxis.X) and "X" or "Y") end
        if bit32.band(s.Flags, ImGuiDockNodeFlags.NoResize) ~= 0 then buf:append(" NoResize=1") end
        if bit32.band(s.Flags, ImGuiDockNodeFlags.CentralNode) ~= 0 then buf:append(" CentralNode=1") end
        if bit32.band(s.Flags, ImGuiDockNodeFlags.NoTabBar) ~= 0 then buf:append(" NoTabBar=1") end
        if bit32.band(s.Flags, ImGuiDockNodeFlags.HiddenTabBar) ~= 0 then buf:append(" HiddenTabBar=1") end
        if bit32.band(s.Flags, ImGuiDockNodeFlags.NoWindowMenuButton) ~= 0 then buf:append(" NoWindowMenuButton=1") end
        if bit32.band(s.Flags, ImGuiDockNodeFlags.NoCloseButton) ~= 0 then buf:append(" NoCloseButton=1") end
        if s.SelectedTabId ~= 0 then buf:appendf(" Selected=0x%08X", s.SelectedTabId) end
        buf:append("\n")
    end
    buf:append("\n")
end

---------------------------------------------------------------------------------------
-- Docking: helpers (imgui_internal.h inlines) + widgets used by docking
---------------------------------------------------------------------------------------

function ImGui.DockNodeGetRootNode(node)
    while node.ParentNode do node = node.ParentNode end
    return node
end

function ImGui.DockNodeIsInHierarchyOf(node, parent)
    while node do
        if node == parent then return true end
        node = node.ParentNode
    end
    return false
end

function ImGui.DockNodeGetDepth(node)
    local depth = 0
    while node.ParentNode do node = node.ParentNode; depth = depth + 1 end
    return depth
end

function ImGui.DockNodeGetWindowMenuButtonId(node)
    return ImHashStr("#COLLAPSE", nil, node.ID)
end

function ImGui.GetWindowDockID()
    return ImGui.GetCurrentContext().CurrentWindow.DockId
end

function ImGui.IsWindowDocked()
    return ImGui.GetCurrentContext().CurrentWindow.DockIsActive
end

function ImGui.SetNextWindowDockID(id, cond)
    local g = ImGui.GetCurrentContext()
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasDock)
    g.NextWindowData.DockCond = (cond and cond ~= 0) and cond or ImGuiCond.Always
    g.NextWindowData.DockId = id
end

function ImGui.StartMouseMovingWindowOrNode(window, node, undock)
    local g = ImGui.GetCurrentContext()
    local can_undock_node = false
    if undock and node ~= nil and node.VisibleWindow and bit32.band(node.VisibleWindow.Flags, ImGuiWindowFlags.NoMove) == 0 and bit32.band(node.MergedFlags, ImGuiDockNodeFlags.NoUndocking) == 0 then
        local root_node = ImGui.DockNodeGetRootNode(node)
        if root_node.OnlyNodeWithWindows ~= node or root_node.CentralNode ~= nil then
            can_undock_node = true
        end
    end

    local clicked = ImGui.IsMouseClicked(0)
    local dragging = ImGui.IsMouseDragging(0)
    if can_undock_node and dragging then
        ImGui.DockContextQueueUndockNode(g, node)
    elseif not can_undock_node and (clicked or dragging) and g.MovingWindow ~= window then
        ImGui.StartMouseMovingWindow(window)
    end
end

function ImGui.RenderArrowDockMenu(draw_list, p_min, sz, col)
    draw_list:AddRectFilled(p_min + ImVec2(sz * 0.20, sz * 0.15), p_min + ImVec2(sz * 0.80, sz * 0.30), col)
    ImGui.RenderArrowPointingAt(draw_list, p_min + ImVec2(sz * 0.50, sz * 0.85), ImVec2(sz * 0.30, sz * 0.40), ImGuiDir.Down, col)
end

-- Upstream CollapseButton (docking branch): replaces the port's simpler version
function ImGui.CollapseButton(id, pos, dock_node)
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow

    local bb = ImRect(pos, pos + ImVec2(g.FontSize, g.FontSize))
    local is_clipped = not ImGui.ItemAdd(bb, id)
    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id, ImGuiButtonFlags.None)
    if is_clipped then return pressed end

    local bg_col = ImGui.GetColorU32((held and hovered) and ImGuiCol.ButtonActive or (hovered and ImGuiCol.ButtonHovered or ImGuiCol.Button))
    local text_col = ImGui.GetColorU32(ImGuiCol.Text)
    if hovered or held then
        window.DrawList:AddRectFilled(bb.Min, bb.Max, bg_col)
    end
    ImGui.RenderNavCursor(bb, id, ImGuiNavRenderCursorFlags and ImGuiNavRenderCursorFlags.Compact or nil)

    if dock_node then
        ImGui.RenderArrowDockMenu(window.DrawList, bb.Min, g.FontSize, text_col)
    else
        ImGui.RenderArrow(window.DrawList, bb.Min, text_col, window.Collapsed and ImGuiDir.Right or ImGuiDir.Down, 1.0)
    end

    if ImGui.IsItemActive() and ImGui.IsMouseDragging(0) then
        ImGui.StartMouseMovingWindowOrNode(window, dock_node, true)
    end

    return pressed
end

--- @return bool held, float size1, float size2
function ImGui.SplitterBehavior(bb, id, axis, size1, size2, min_size1, min_size2, hover_extend, hover_visibility_delay, bg_col)
    hover_extend = hover_extend or 0.0
    hover_visibility_delay = hover_visibility_delay or 0.0
    bg_col = bg_col or 0
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow

    if not ImGui.ItemAdd(bb, id, nil, ImGuiItemFlags.NoNav) then return false, size1, size2 end

    local button_flags = bit32.bor(ImGuiButtonFlags.FlattenChildren, ImGuiButtonFlags.AllowOverlap)

    local bb_interact = ImRect(bb.Min, bb.Max)
    bb_interact:Expand(axis == ImGuiAxis.Y and ImVec2(0.0, hover_extend) or ImVec2(hover_extend, 0.0))
    local _, hovered, held = ImGui.ButtonBehavior(bb_interact, id, button_flags)
    if hovered then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredRect)
    end

    if held or (hovered and g.HoveredIdPreviousFrame == id and g.HoveredIdTimer >= hover_visibility_delay) then
        ImGui.SetMouseCursor(axis == ImGuiAxis.Y and ImGuiMouseCursor.ResizeNS or ImGuiMouseCursor.ResizeEW)
    end

    local bb_render = ImRect(bb.Min, bb.Max)
    if held then
        local d = g.IO.MousePos - g.ActiveIdClickOffset - bb_interact.Min
        local mouse_delta = d[axis]

        local size_1_maximum_delta = ImMax(0.0, size1 - min_size1)
        local size_2_maximum_delta = ImMax(0.0, size2 - min_size2)
        if mouse_delta < -size_1_maximum_delta then mouse_delta = -size_1_maximum_delta end
        if mouse_delta > size_2_maximum_delta then mouse_delta = size_2_maximum_delta end

        if mouse_delta ~= 0.0 then
            size1 = ImMax(size1 + mouse_delta, min_size1)
            size2 = ImMax(size2 - mouse_delta, min_size2)
            bb_render:Translate(axis == ImGuiAxis.X and ImVec2(mouse_delta, 0.0) or ImVec2(0.0, mouse_delta))
            ImGui.MarkItemEdited(id)
        end
    end

    if bit32.band(bg_col, IM_COL32_A_MASK) ~= 0 then
        window.DrawList:AddRectFilled(bb_render.Min, bb_render.Max, bg_col, 0.0)
    end
    local col = ImGui.GetColorU32(held and ImGuiCol.SeparatorActive or ((hovered and g.HoveredIdTimer >= hover_visibility_delay) and ImGuiCol.SeparatorHovered or ImGuiCol.Separator))
    window.DrawList:AddRectFilled(bb_render.Min, bb_render.Max, col, 0.0)

    return held, size1, size2
end

return true
end

__FILES['imgui_dragdrop.lua'] = function()
--- ImGui Sincerely
-- Drag and drop: 1:1 port of imgui.cpp [SECTION] DRAG AND DROP (docking branch)
-- Payload `Data` is any Lua value (no copy is made). `data_size` is optional and only kept for API parity.

function ImGui.IsDragDropActive()
    return ImGui.GetCurrentContext().DragDropActive
end

function ImGui.ClearDragDrop()
    local g = ImGui.GetCurrentContext()
    g.DragDropActive = false
    ImGuiPayload_Clear(g.DragDropPayload)
    g.DragDropAcceptFlagsCurr = ImGuiDragDropFlags.None
    g.DragDropAcceptIdCurr = 0
    g.DragDropAcceptIdPrev = 0
    g.DragDropAcceptIdCurrRectSurface = FLT_MAX
    g.DragDropAcceptFrameCount = -1
end

function ImGui.BeginDragDropSource(flags)
    if flags == nil then flags = 0 end
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow

    local mouse_button = ImGuiMouseButton.Left

    local source_drag_active = false
    local source_id = 0
    local source_parent_id = 0
    if bit32.band(flags, ImGuiDragDropFlags.SourceExtern) == 0 then
        source_id = g.LastItemData.ID
        if source_id ~= 0 then
            if g.ActiveId ~= source_id then return false end
            if g.ActiveIdMouseButton ~= -1 then mouse_button = g.ActiveIdMouseButton end
            if g.IO.MouseDown[mouse_button] == false or window.SkipItems then return false end
            g.ActiveIdAllowOverlap = false
        else
            if g.IO.MouseDown[mouse_button] == false or window.SkipItems then return false end
            if bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredRect) == 0 and (g.ActiveId == 0 or g.ActiveIdWindow ~= window) then
                return false
            end
            if bit32.band(flags, ImGuiDragDropFlags.SourceAllowNullID) == 0 then
                IM_ASSERT(false, "Use ImGuiDragDropFlags.SourceAllowNullID for items without an ID")
                return false
            end
            source_id = window:GetIDFromRectangle(g.LastItemData.Rect)
            g.LastItemData.ID = source_id
            ImGui.KeepAliveID(source_id)
            local is_hovered = ImGui.ItemHoverable(g.LastItemData.Rect, source_id, g.LastItemData.ItemFlags)
            if is_hovered and g.IO.MouseClicked[mouse_button] then
                ImGui.SetActiveID(source_id, window)
                ImGui.FocusWindow(window)
            end
            if g.ActiveId == source_id then g.ActiveIdAllowOverlap = is_hovered end
        end
        if g.ActiveId ~= source_id then return false end
        source_parent_id = window.IDStack.Data[window.IDStack.Size]
        source_drag_active = ImGui.IsMouseDragging(mouse_button)

        ImGui.SetActiveIdUsingAllKeyboardKeys()
    else
        window = nil
        source_id = ImHashStr("#SourceExtern")
        source_drag_active = true
        mouse_button = g.IO.MouseDown[0] and 0 or -1
        ImGui.KeepAliveID(source_id)
        ImGui.SetActiveID(source_id, nil)
    end

    IM_ASSERT(g.DragDropWithinTarget == false)
    if not source_drag_active then return false end

    if not g.DragDropActive then
        IM_ASSERT(source_id ~= 0)
        ImGui.ClearDragDrop()
        local payload = g.DragDropPayload
        payload.SourceId = source_id
        payload.SourceParentId = source_parent_id
        g.DragDropActive = true
        g.DragDropSourceFlags = flags
        g.DragDropMouseButton = mouse_button
        if payload.SourceId == g.ActiveId then g.ActiveIdNoClearOnFocusLoss = true end
    end
    g.DragDropSourceFrameCount = g.FrameCount
    g.DragDropWithinSource = true

    if bit32.band(flags, ImGuiDragDropFlags.SourceNoPreviewTooltip) == 0 then
        local ret
        if g.DragDropAcceptIdPrev ~= 0 and bit32.band(g.DragDropAcceptFlagsPrev, ImGuiDragDropFlags.AcceptNoPreviewTooltip) ~= 0 then
            ret = ImGui.BeginTooltipHidden()
        else
            ret = ImGui.BeginTooltip()
        end
        IM_ASSERT(ret)
    end

    if bit32.band(flags, ImGuiDragDropFlags.SourceNoDisableHover) == 0 and bit32.band(flags, ImGuiDragDropFlags.SourceExtern) == 0 then
        g.LastItemData.StatusFlags = bit32.band(g.LastItemData.StatusFlags, bit32.bnot(ImGuiItemStatusFlags.HoveredRect))
    end
    return true
end

function ImGui.EndDragDropSource()
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(g.DragDropActive)
    IM_ASSERT(g.DragDropWithinSource, "Not after a BeginDragDropSource()?")

    if bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.SourceNoPreviewTooltip) == 0 then
        ImGui.EndTooltip()
    end

    if g.DragDropPayload.DataFrameCount == -1 then ImGui.ClearDragDrop() end
    g.DragDropWithinSource = false
end

--- @param data any # any Lua value
--- @return bool accepted
function ImGui.SetDragDropPayload(type, data, data_size, cond)
    local g = ImGui.GetCurrentContext()
    local payload = g.DragDropPayload
    if cond == nil or cond == 0 then cond = ImGuiCond.Always end

    IM_ASSERT(type ~= nil)
    IM_ASSERT(#type < 32, "Payload type can be at most 32 characters long")
    IM_ASSERT(cond == ImGuiCond.Always or cond == ImGuiCond.Once)
    IM_ASSERT(payload.SourceId ~= 0)

    if cond == ImGuiCond.Always or payload.DataFrameCount == -1 then
        payload.DataType = type
        payload.Data = data
        payload.DataSize = data_size or ((data ~= nil) and 1 or 0)
    end
    payload.DataFrameCount = g.FrameCount

    return (g.DragDropAcceptFrameCount == g.FrameCount) or (g.DragDropAcceptFrameCount == g.FrameCount - 1)
end

function ImGui.BeginDragDropTargetCustom(bb, id)
    local g = ImGui.GetCurrentContext()
    if not g.DragDropActive then return false end

    local window = g.CurrentWindow
    local hovered_window = g.HoveredWindowUnderMovingWindow
    if hovered_window == nil or window.RootWindowDockTree ~= hovered_window.RootWindowDockTree then return false end
    IM_ASSERT(id ~= 0)
    if not ImGui.IsMouseHoveringRect(bb.Min, bb.Max) or (id == g.DragDropPayload.SourceId) then return false end
    if window.SkipItems then return false end

    IM_ASSERT(g.DragDropWithinTarget == false and g.DragDropWithinSource == false)
    g.DragDropTargetRect = ImRect(bb.Min, bb.Max)
    g.DragDropTargetClipRect = ImRect(window.ClipRect.Min, window.ClipRect.Max)
    g.DragDropTargetId = id
    g.DragDropTargetFullViewport = 0
    g.DragDropWithinTarget = true
    return true
end

function ImGui.BeginDragDropTargetViewport(viewport, p_bb)
    local g = ImGui.GetCurrentContext()
    if not g.DragDropActive then return false end

    local bb = p_bb or viewport:GetWorkRect()
    local id = viewport.ID
    if g.MouseViewport ~= viewport or not ImGui.IsMouseHoveringRect(bb.Min, bb.Max, false) or (id == g.DragDropPayload.SourceId) then
        return false
    end

    IM_ASSERT(g.DragDropWithinTarget == false and g.DragDropWithinSource == false)
    g.DragDropTargetRect = ImRect(bb.Min, bb.Max)
    g.DragDropTargetClipRect = ImRect(bb.Min, bb.Max)
    g.DragDropTargetId = id
    g.DragDropTargetFullViewport = id
    g.DragDropWithinTarget = true
    return true
end

function ImGui.BeginDragDropTarget()
    local g = ImGui.GetCurrentContext()
    if not g.DragDropActive then return false end

    local window = g.CurrentWindow
    if bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredRect) == 0 then return false end
    local hovered_window = g.HoveredWindowUnderMovingWindow
    if hovered_window == nil or window.RootWindowDockTree ~= hovered_window.RootWindowDockTree or window.SkipItems then return false end

    local display_rect = (bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasDisplayRect) ~= 0) and g.LastItemData.DisplayRect or g.LastItemData.Rect
    local id = g.LastItemData.ID
    if id == 0 then
        id = window:GetIDFromRectangle(display_rect)
        ImGui.KeepAliveID(id)
    end
    if g.DragDropPayload.SourceId == id then return false end

    IM_ASSERT(g.DragDropWithinTarget == false and g.DragDropWithinSource == false)
    g.DragDropTargetRect = ImRect(display_rect.Min, display_rect.Max)
    local clip = (bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasClipRect) ~= 0) and g.LastItemData.ClipRect or window.ClipRect
    g.DragDropTargetClipRect = ImRect(clip.Min, clip.Max)
    g.DragDropTargetId = id
    g.DragDropWithinTarget = true
    return true
end

function ImGui.IsDragDropPayloadBeingAccepted()
    local g = ImGui.GetCurrentContext()
    return g.DragDropActive and g.DragDropAcceptIdPrev ~= 0
end

--- @return ImGuiPayload?
function ImGui.AcceptDragDropPayload(type, flags)
    if flags == nil then flags = 0 end
    local g = ImGui.GetCurrentContext()
    local payload = g.DragDropPayload
    IM_ASSERT(g.DragDropActive)
    IM_ASSERT(payload.DataFrameCount ~= -1)
    if type ~= nil and not ImGuiPayload_IsDataType(payload, type) then return nil end

    local was_accepted_previously = (g.DragDropAcceptIdPrev == g.DragDropTargetId)
    local r = g.DragDropTargetRect
    local r_surface = r:GetWidth() * r:GetHeight()
    if r_surface > g.DragDropAcceptIdCurrRectSurface then return nil end

    g.DragDropAcceptFlagsCurr = flags
    g.DragDropAcceptIdCurr = g.DragDropTargetId
    g.DragDropAcceptIdCurrRectSurface = r_surface

    payload.Preview = was_accepted_previously
    flags = bit32.bor(flags, bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.AcceptNoDrawDefaultRect))
    local draw_target_rect = payload.Preview and bit32.band(flags, ImGuiDragDropFlags.AcceptNoDrawDefaultRect) == 0
    if draw_target_rect and g.DragDropTargetFullViewport ~= 0 then
        ImGui.RenderDragDropTargetRectForViewport(g.DragDropTargetFullViewport, g.DragDropTargetRect)
    elseif draw_target_rect then
        ImGui.RenderDragDropTargetRectForItem(r)
    end

    g.DragDropAcceptFrameCount = g.FrameCount
    if bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.SourceExtern) ~= 0 and g.DragDropMouseButton == -1 then
        payload.Delivery = was_accepted_previously and (g.DragDropSourceFrameCount < g.FrameCount)
    else
        payload.Delivery = was_accepted_previously and not ImGui.IsMouseDown(g.DragDropMouseButton)
    end
    if not payload.Delivery and bit32.band(flags, ImGuiDragDropFlags.AcceptBeforeDelivery) == 0 then return nil end
    return payload
end

function ImGui.RenderDragDropTargetRectForItem(bb)
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow
    local bb_display = ImRect(bb.Min, bb.Max)
    bb_display:ClipWith(g.DragDropTargetClipRect)
    bb_display:Expand(g.Style.DragDropTargetPadding)
    local push_clip_rect = not window.ClipRect:Contains(bb_display)
    if push_clip_rect then window.DrawList:PushClipRectFullScreen() end
    ImGui.RenderDragDropTargetRectEx(window.DrawList, bb_display, g.Style.DragDropTargetRounding)
    if push_clip_rect then window.DrawList:PopClipRect() end
end

function ImGui.RenderDragDropTargetRectForViewport(viewport_id, bb)
    local g = ImGui.GetCurrentContext()
    local viewport = ImGui.FindViewportByID(viewport_id)
    IM_ASSERT(viewport ~= nil)
    local bb_padded = ImRect(bb.Min, bb.Max)
    bb_padded:Expand(-g.Style.DragDropTargetPadding)
    ImGui.RenderDragDropTargetRectEx(ImGui.GetForegroundDrawList(viewport), bb_padded, g.Style.DragDropTargetRounding)
end

function ImGui.RenderDragDropTargetRectEx(draw_list, bb, rounding)
    local g = ImGui.GetCurrentContext()
    draw_list:AddRectFilled(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.DragDropTargetBg), rounding, 0)
    draw_list:AddRect(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.DragDropTarget), rounding, g.Style.DragDropTargetBorderSize)
end

--- @return ImGuiPayload?
function ImGui.GetDragDropPayload()
    local g = ImGui.GetCurrentContext()
    return (g.DragDropActive and g.DragDropPayload.DataFrameCount ~= -1) and g.DragDropPayload or nil
end

function ImGui.EndDragDropTarget()
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(g.DragDropActive)
    IM_ASSERT(g.DragDropWithinTarget)
    g.DragDropWithinTarget = false
    if g.DragDropPayload.Delivery then ImGui.ClearDragDrop() end
end

-- Payload methods (C++ ImGuiPayload members): payload:IsDataType(t) etc. also work through these globals
function ImGui.PayloadIsDataType(payload, t) return ImGuiPayload_IsDataType(payload, t) end

return true
end

__FILES['imgui_draw.lua'] = function()
--- ImGui Sincerely WIP
-- (Draw Code)

FONT_ATLAS_DEFAULT_TEX_DATA_W = 122
FONT_ATLAS_DEFAULT_TEX_DATA_H = 27

local IM_DRAWLIST_TEX_LINES_WIDTH_MAX = 32

local IM_FONTGLYPH_INDEX_UNUSED    = 0xFFFF
local IM_FONTGLYPH_INDEX_NOT_FOUND = 0xFFFE

--- @param str string
--- @return table
--- @nodiscard
--- @package
local function str_to_table(str)
    local t = {} for i = 1, #str do t[i] = string.sub(str, i, i) end return t
end

--- @param buf  char[] # 1-based
--- @param base int    # 1-based start index
--- @param u32  ImU32
local function write_u32(buf, base, u32)
    buf[base + 0] = bit32.band(u32, 0xFF)
    buf[base + 1] = bit32.band(bit32.rshift(u32, 8), 0xFF)
    buf[base + 2] = bit32.band(bit32.rshift(u32, 16), 0xFF)
    buf[base + 3] = bit32.band(bit32.rshift(u32, 24), 0xFF)
end

--- Original ImGui pixel art!
local FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS = str_to_table(
    "..-         -XXXXXXX-    X    -           X           -XXXXXXX          -          XXXXXXX-     XX          - XX       XX " ..
    "..-         -X.....X-   X.X   -          X.X          -X.....X          -          X.....X-    X..X         -X..X     X..X" ..
    "---         -XXX.XXX-  X...X  -         X...X         -X....X           -           X....X-    X..X         -X...X   X...X" ..
    "X           -  X.X  - X.....X -        X.....X        -X...X            -            X...X-    X..X         - X...X X...X " ..
    "XX          -  X.X  -X.......X-       X.......X       -X..X.X           -           X.X..X-    X..X         -  X...X...X  " ..
    "X.X         -  X.X  -XXXX.XXXX-       XXXX.XXXX       -X.X X.X          -          X.X X.X-    X..XXX       -   X.....X   " ..
    "X..X        -  X.X  -   X.X   -          X.X          -XX   X.X         -         X.X   XX-    X..X..XXX    -    X...X    " ..
    "X...X       -  X.X  -   X.X   -    XX    X.X    XX    -      X.X        -        X.X      -    X..X..X..XX  -     X.X     " ..
    "X....X      -  X.X  -   X.X   -   X.X    X.X    X.X   -       X.X       -       X.X       -    X..X..X..X.X -    X...X    " ..
    "X.....X     -  X.X  -   X.X   -  X..X    X.X    X..X  -        X.X      -      X.X        -XXX X..X..X..X..X-   X.....X   " ..
    "X......X    -  X.X  -   X.X   - X...XXXXXX.XXXXXX...X -         X.X   XX-XX   X.X         -X..XX........X..X-  X...X...X  " ..
    "X.......X   -  X.X  -   X.X   -X.....................X-          X.X X.X-X.X X.X          -X...X...........X- X...X X...X " ..
    "X........X  -  X.X  -   X.X   - X...XXXXXX.XXXXXX...X -           X.X..X-X..X.X           - X..............X-X...X   X...X" ..
    "X.........X -XXX.XXX-   X.X   -  X..X    X.X    X..X  -            X...X-X...X            -  X.............X-X..X     X..X" ..
    "X..........X-X.....X-   X.X   -   X.X    X.X    X.X   -           X....X-X....X           -  X.............X- XX       XX " ..
    "X......XXXXX-XXXXXXX-   X.X   -    XX    X.X    XX    -          X.....X-X.....X          -   X............X--------------" ..
    "X...X..X    ---------   X.X   -          X.X          -          XXXXXXX-XXXXXXX          -   X...........X -             " ..
    "X..X X..X   -       -XXXX.XXXX-       XXXX.XXXX       -------------------------------------    X..........X -             " ..
    "X.X  X..X   -       -X.......X-       X.......X       -    XX           XX    -           -    X..........X -             " ..
    "XX    X..X  -       - X.....X -        X.....X        -   X.X           X.X   -           -     X........X  -             " ..
    "      X..X  -       -  X...X  -         X...X         -  X..X           X..X  -           -     X........X  -             " ..
    "       XX   -       -   X.X   -          X.X          - X...XXXXXXXXXXXXX...X -           -     XXXXXXXXXX  -             " ..
    "-------------       -    X    -           X           -X.....................X-           -------------------             " ..
    "                    ----------------------------------- X...XXXXXXXXXXXXX...X -                                           " ..
    "                                                      -  X..X           X..X  -                                           " ..
    "                                                      -   X.X           X.X   -                                           " ..
    "                                                      -    XX           XX    -                                           "
)

local FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA = {
    -- Pos ..........  Size .........  Offset .......
    { ImVec2(  0,  3), ImVec2(12, 19), ImVec2( 0,  0) }, -- ImGuiMouseCursor.Arrow
    { ImVec2( 13,  0), ImVec2( 7, 16), ImVec2( 1,  8) }, -- ImGuiMouseCursor.TextInput
    { ImVec2( 31,  0), ImVec2(23, 23), ImVec2(11, 11) }, -- ImGuiMouseCursor.ResizeAll
    { ImVec2( 21,  0), ImVec2( 9, 23), ImVec2( 4, 11) }, -- ImGuiMouseCursor.ResizeNS
    { ImVec2( 55, 18), ImVec2(23,  9), ImVec2(11,  4) }, -- ImGuiMouseCursor.ResizeEW
    { ImVec2( 73,  0), ImVec2(17, 17), ImVec2( 8,  8) }, -- ImGuiMouseCursor.ResizeNESW
    { ImVec2( 55,  0), ImVec2(17, 17), ImVec2( 8,  8) }, -- ImGuiMouseCursor.ResizeNWSE
    { ImVec2( 91,  0), ImVec2(17, 22), ImVec2( 5,  0) }, -- ImGuiMouseCursor.Hand
    { ImVec2(  0,  3), ImVec2(12, 19), ImVec2( 0,  0) }, -- ImGuiMouseCursor.Wait     -- Arrow + custom code in ImGui.RenderMouseCursor()
    { ImVec2(  0,  3), ImVec2(12, 19), ImVec2( 0,  0) }, -- ImGuiMouseCursor.Progress -- Arrow + custom code in ImGui.RenderMouseCursor()
    { ImVec2(109,  0), ImVec2(13, 15), ImVec2( 6,  7) }, -- ImGuiMouseCursor.NotAllowed
}

local MT = ImGui.GetMetatables()

--- @module "imstb_rectpack"
local stbrp = IM_INCLUDE("imstb_rectpack.lua")

--- @module "imstb_truetype"
local stbtt = IM_INCLUDE("imstb_truetype.lua")

---------------------------------------------------------------------------------------
-- [SECTION] STYLE FUNCTIONS
---------------------------------------------------------------------------------------

--- @param a ImVec4
--- @param b ImVec4
--- @param t float
local function ImLerpV4V4F(a, b, t) return ImVec4(a.x + (b.x - a.x) * t, a.y + (b.y - a.y) * t, a.z + (b.z - a.z) * t, a.w + (b.w - a.w) * t) end

--- @param dst? ImGuiStyle
function ImGui.StyleColorsDark(dst)
    local style = dst and dst or ImGui.GetStyle()
    local colors = style.Colors

    colors[ImGuiCol.Text]                      = ImVec4(1.00, 1.00, 1.00, 1.00)
    colors[ImGuiCol.TextDisabled]              = ImVec4(0.50, 0.50, 0.50, 1.00)
    colors[ImGuiCol.WindowBg]                  = ImVec4(0.06, 0.06, 0.06, 0.94)
    colors[ImGuiCol.ChildBg]                   = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.PopupBg]                   = ImVec4(0.08, 0.08, 0.08, 0.94)
    colors[ImGuiCol.Border]                    = ImVec4(0.43, 0.43, 0.50, 0.50)
    colors[ImGuiCol.BorderShadow]              = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.FrameBg]                   = ImVec4(0.16, 0.29, 0.48, 0.54)
    colors[ImGuiCol.FrameBgHovered]            = ImVec4(0.26, 0.59, 0.98, 0.40)
    colors[ImGuiCol.FrameBgActive]             = ImVec4(0.26, 0.59, 0.98, 0.67)
    colors[ImGuiCol.TitleBg]                   = ImVec4(0.04, 0.04, 0.04, 1.00)
    colors[ImGuiCol.TitleBgActive]             = ImVec4(0.16, 0.29, 0.48, 1.00)
    colors[ImGuiCol.TitleBgCollapsed]          = ImVec4(0.00, 0.00, 0.00, 0.51)
    colors[ImGuiCol.MenuBarBg]                 = ImVec4(0.14, 0.14, 0.14, 1.00)
    colors[ImGuiCol.ScrollbarBg]               = ImVec4(0.02, 0.02, 0.02, 0.53)
    colors[ImGuiCol.ScrollbarGrab]             = ImVec4(0.31, 0.31, 0.31, 1.00)
    colors[ImGuiCol.ScrollbarGrabHovered]      = ImVec4(0.41, 0.41, 0.41, 1.00)
    colors[ImGuiCol.ScrollbarGrabActive]       = ImVec4(0.51, 0.51, 0.51, 1.00)
    colors[ImGuiCol.CheckMark]                 = ImVec4(0.26, 0.59, 0.98, 1.00)
    colors[ImGuiCol.CheckboxSelectedBg]        = ImLerpV4V4F(colors[ImGuiCol.FrameBg], colors[ImGuiCol.FrameBgHovered], 0.65)
    colors[ImGuiCol.SliderGrab]                = ImVec4(0.24, 0.52, 0.88, 1.00)
    colors[ImGuiCol.SliderGrabActive]          = ImVec4(0.26, 0.59, 0.98, 1.00)
    colors[ImGuiCol.Button]                    = ImVec4(0.26, 0.59, 0.98, 0.40)
    colors[ImGuiCol.ButtonHovered]             = ImVec4(0.26, 0.59, 0.98, 1.00)
    colors[ImGuiCol.ButtonActive]              = ImVec4(0.06, 0.53, 0.98, 1.00)
    colors[ImGuiCol.Header]                    = ImVec4(0.26, 0.59, 0.98, 0.31)
    colors[ImGuiCol.HeaderHovered]             = ImVec4(0.26, 0.59, 0.98, 0.80)
    colors[ImGuiCol.HeaderActive]              = ImVec4(0.26, 0.59, 0.98, 1.00)
    colors[ImGuiCol.Separator]                 = colors[ImGuiCol.Border]
    colors[ImGuiCol.SeparatorHovered]          = ImVec4(0.10, 0.40, 0.75, 0.78)
    colors[ImGuiCol.SeparatorActive]           = ImVec4(0.10, 0.40, 0.75, 1.00)
    colors[ImGuiCol.ResizeGrip]                = ImVec4(0.26, 0.59, 0.98, 0.20)
    colors[ImGuiCol.ResizeGripHovered]         = ImVec4(0.26, 0.59, 0.98, 0.67)
    colors[ImGuiCol.ResizeGripActive]          = ImVec4(0.26, 0.59, 0.98, 0.95)
    colors[ImGuiCol.InputTextCursor]           = colors[ImGuiCol.Text]
    colors[ImGuiCol.TabHovered]                = colors[ImGuiCol.HeaderHovered]
    colors[ImGuiCol.Tab]                       = ImLerpV4V4F(colors[ImGuiCol.Header],       colors[ImGuiCol.TitleBgActive], 0.80)
    colors[ImGuiCol.TabSelected]               = ImLerpV4V4F(colors[ImGuiCol.HeaderActive], colors[ImGuiCol.TitleBgActive], 0.60)
    colors[ImGuiCol.TabSelectedOverline]       = colors[ImGuiCol.HeaderActive]
    colors[ImGuiCol.TabDimmed]                 = ImLerpV4V4F(colors[ImGuiCol.Tab],          colors[ImGuiCol.TitleBg], 0.80)
    colors[ImGuiCol.TabDimmedSelected]         = ImLerpV4V4F(colors[ImGuiCol.TabSelected],  colors[ImGuiCol.TitleBg], 0.40)
    colors[ImGuiCol.TabDimmedSelectedOverline] = ImVec4(0.50, 0.50, 0.50, 0.00)
    colors[ImGuiCol.DockingPreview] = ImVec4(colors[ImGuiCol.HeaderActive].x, colors[ImGuiCol.HeaderActive].y, colors[ImGuiCol.HeaderActive].z, colors[ImGuiCol.HeaderActive].w * 0.7)
    colors[ImGuiCol.DockingEmptyBg] = ImVec4(0.20, 0.20, 0.20, 1.00)
    colors[ImGuiCol.PlotLines]                 = ImVec4(0.61, 0.61, 0.61, 1.00)
    colors[ImGuiCol.PlotLinesHovered]          = ImVec4(1.00, 0.43, 0.35, 1.00)
    colors[ImGuiCol.PlotHistogram]             = ImVec4(0.90, 0.70, 0.00, 1.00)
    colors[ImGuiCol.PlotHistogramHovered]      = ImVec4(1.00, 0.60, 0.00, 1.00)
    colors[ImGuiCol.TableHeaderBg]             = ImVec4(0.19, 0.19, 0.20, 1.00)
    colors[ImGuiCol.TableBorderStrong]         = ImVec4(0.31, 0.31, 0.35, 1.00)
    colors[ImGuiCol.TableBorderLight]          = ImVec4(0.23, 0.23, 0.25, 1.00)
    colors[ImGuiCol.TableRowBg]                = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.TableRowBgAlt]             = ImVec4(1.00, 1.00, 1.00, 0.06)
    colors[ImGuiCol.TextLink]                  = colors[ImGuiCol.HeaderActive]
    colors[ImGuiCol.TextSelectedBg]            = ImVec4(0.26, 0.59, 0.98, 0.35)
    colors[ImGuiCol.TreeLines]                 = colors[ImGuiCol.Border]
    colors[ImGuiCol.DragDropTarget]            = ImVec4(1.00, 1.00, 0.00, 0.90)
    colors[ImGuiCol.DragDropTargetBg]          = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.UnsavedMarker]             = ImVec4(1.00, 1.00, 1.00, 1.00)
    colors[ImGuiCol.NavCursor]                 = ImVec4(0.26, 0.59, 0.98, 1.00)
    colors[ImGuiCol.NavWindowingHighlight]     = ImVec4(1.00, 1.00, 1.00, 0.70)
    colors[ImGuiCol.NavWindowingDimBg]         = ImVec4(0.80, 0.80, 0.80, 0.20)
    colors[ImGuiCol.ModalWindowDimBg]          = ImVec4(0.80, 0.80, 0.80, 0.35)
end

--- @param dst? ImGuiStyle
function ImGui.StyleColorsClassic(dst)
    local style = dst and dst or ImGui.GetStyle()
    local colors = style.Colors

    colors[ImGuiCol.Text]                      = ImVec4(0.90, 0.90, 0.90, 1.00)
    colors[ImGuiCol.TextDisabled]              = ImVec4(0.60, 0.60, 0.60, 1.00)
    colors[ImGuiCol.WindowBg]                  = ImVec4(0.00, 0.00, 0.00, 0.85)
    colors[ImGuiCol.ChildBg]                   = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.PopupBg]                   = ImVec4(0.11, 0.11, 0.14, 0.92)
    colors[ImGuiCol.Border]                    = ImVec4(0.50, 0.50, 0.50, 0.50)
    colors[ImGuiCol.BorderShadow]              = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.FrameBg]                   = ImVec4(0.43, 0.43, 0.43, 0.39)
    colors[ImGuiCol.FrameBgHovered]            = ImVec4(0.47, 0.47, 0.69, 0.40)
    colors[ImGuiCol.FrameBgActive]             = ImVec4(0.42, 0.41, 0.64, 0.69)
    colors[ImGuiCol.TitleBg]                   = ImVec4(0.27, 0.27, 0.54, 0.83)
    colors[ImGuiCol.TitleBgActive]             = ImVec4(0.32, 0.32, 0.63, 0.87)
    colors[ImGuiCol.TitleBgCollapsed]          = ImVec4(0.40, 0.40, 0.80, 0.20)
    colors[ImGuiCol.MenuBarBg]                 = ImVec4(0.40, 0.40, 0.55, 0.80)
    colors[ImGuiCol.ScrollbarBg]               = ImVec4(0.20, 0.25, 0.30, 0.60)
    colors[ImGuiCol.ScrollbarGrab]             = ImVec4(0.40, 0.40, 0.80, 0.30)
    colors[ImGuiCol.ScrollbarGrabHovered]      = ImVec4(0.40, 0.40, 0.80, 0.40)
    colors[ImGuiCol.ScrollbarGrabActive]       = ImVec4(0.41, 0.39, 0.80, 0.60)
    colors[ImGuiCol.CheckMark]                 = ImVec4(0.90, 0.90, 0.90, 0.50)
    colors[ImGuiCol.CheckboxSelectedBg]        = ImLerpV4V4F(colors[ImGuiCol.FrameBg], colors[ImGuiCol.FrameBgActive], 0.65)
    colors[ImGuiCol.SliderGrab]                = ImVec4(1.00, 1.00, 1.00, 0.30)
    colors[ImGuiCol.SliderGrabActive]          = ImVec4(0.41, 0.39, 0.80, 0.60)
    colors[ImGuiCol.Button]                    = ImVec4(0.35, 0.40, 0.61, 0.62)
    colors[ImGuiCol.ButtonHovered]             = ImVec4(0.40, 0.48, 0.71, 0.79)
    colors[ImGuiCol.ButtonActive]              = ImVec4(0.46, 0.54, 0.80, 1.00)
    colors[ImGuiCol.Header]                    = ImVec4(0.40, 0.40, 0.90, 0.45)
    colors[ImGuiCol.HeaderHovered]             = ImVec4(0.45, 0.45, 0.90, 0.80)
    colors[ImGuiCol.HeaderActive]              = ImVec4(0.53, 0.53, 0.87, 0.80)
    colors[ImGuiCol.Separator]                 = ImVec4(0.50, 0.50, 0.50, 0.60)
    colors[ImGuiCol.SeparatorHovered]          = ImVec4(0.60, 0.60, 0.70, 1.00)
    colors[ImGuiCol.SeparatorActive]           = ImVec4(0.70, 0.70, 0.90, 1.00)
    colors[ImGuiCol.ResizeGrip]                = ImVec4(1.00, 1.00, 1.00, 0.10)
    colors[ImGuiCol.ResizeGripHovered]         = ImVec4(0.78, 0.82, 1.00, 0.60)
    colors[ImGuiCol.ResizeGripActive]          = ImVec4(0.78, 0.82, 1.00, 0.90)
    colors[ImGuiCol.InputTextCursor]           = colors[ImGuiCol.Text]
    colors[ImGuiCol.TabHovered]                = colors[ImGuiCol.HeaderHovered]
    colors[ImGuiCol.Tab]                       = ImLerpV4V4F(colors[ImGuiCol.Header],       colors[ImGuiCol.TitleBgActive], 0.80)
    colors[ImGuiCol.TabSelected]               = ImLerpV4V4F(colors[ImGuiCol.HeaderActive], colors[ImGuiCol.TitleBgActive], 0.60)
    colors[ImGuiCol.TabSelectedOverline]       = colors[ImGuiCol.HeaderActive]
    colors[ImGuiCol.TabDimmed]                 = ImLerpV4V4F(colors[ImGuiCol.Tab],          colors[ImGuiCol.TitleBg], 0.80)
    colors[ImGuiCol.TabDimmedSelected]         = ImLerpV4V4F(colors[ImGuiCol.TabSelected],  colors[ImGuiCol.TitleBg], 0.40)
    colors[ImGuiCol.TabDimmedSelectedOverline] = ImVec4(0.53, 0.53, 0.87, 0.00)
    colors[ImGuiCol.DockingPreview] = ImVec4(colors[ImGuiCol.Header].x, colors[ImGuiCol.Header].y, colors[ImGuiCol.Header].z, colors[ImGuiCol.Header].w * 0.7)
    colors[ImGuiCol.DockingEmptyBg] = ImVec4(0.20, 0.20, 0.20, 1.00)
    colors[ImGuiCol.PlotLines]                 = ImVec4(1.00, 1.00, 1.00, 1.00)
    colors[ImGuiCol.PlotLinesHovered]          = ImVec4(0.90, 0.70, 0.00, 1.00)
    colors[ImGuiCol.PlotHistogram]             = ImVec4(0.90, 0.70, 0.00, 1.00)
    colors[ImGuiCol.PlotHistogramHovered]      = ImVec4(1.00, 0.60, 0.00, 1.00)
    colors[ImGuiCol.TableHeaderBg]             = ImVec4(0.27, 0.27, 0.38, 1.00)
    colors[ImGuiCol.TableBorderStrong]         = ImVec4(0.31, 0.31, 0.45, 1.00)
    colors[ImGuiCol.TableBorderLight]          = ImVec4(0.26, 0.26, 0.28, 1.00)
    colors[ImGuiCol.TableRowBg]                = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.TableRowBgAlt]             = ImVec4(1.00, 1.00, 1.00, 0.07)
    colors[ImGuiCol.TextLink]                  = colors[ImGuiCol.HeaderActive]
    colors[ImGuiCol.TextSelectedBg]            = ImVec4(0.00, 0.00, 1.00, 0.35)
    colors[ImGuiCol.TreeLines]                 = colors[ImGuiCol.Border]
    colors[ImGuiCol.DragDropTarget]            = ImVec4(1.00, 1.00, 0.00, 0.90)
    colors[ImGuiCol.DragDropTargetBg]          = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.UnsavedMarker]             = ImVec4(0.90, 0.90, 0.90, 1.00)
    colors[ImGuiCol.NavCursor]                 = colors[ImGuiCol.HeaderHovered]
    colors[ImGuiCol.NavWindowingHighlight]     = ImVec4(1.00, 1.00, 1.00, 0.70)
    colors[ImGuiCol.NavWindowingDimBg]         = ImVec4(0.80, 0.80, 0.80, 0.20)
    colors[ImGuiCol.ModalWindowDimBg]          = ImVec4(0.20, 0.20, 0.20, 0.35)
end

-- Those light colors are better suited with a thicker font than the default one + FrameBorder
--- @param dst? ImGuiStyle
function ImGui.StyleColorsLight(dst)
    local style = dst and dst or ImGui.GetStyle()
    local colors = style.Colors

    colors[ImGuiCol.Text]                      = ImVec4(0.00, 0.00, 0.00, 1.00)
    colors[ImGuiCol.TextDisabled]              = ImVec4(0.60, 0.60, 0.60, 1.00)
    colors[ImGuiCol.WindowBg]                  = ImVec4(0.94, 0.94, 0.94, 1.00)
    colors[ImGuiCol.ChildBg]                   = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.PopupBg]                   = ImVec4(1.00, 1.00, 1.00, 0.98)
    colors[ImGuiCol.Border]                    = ImVec4(0.00, 0.00, 0.00, 0.30)
    colors[ImGuiCol.BorderShadow]              = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.FrameBg]                   = ImVec4(1.00, 1.00, 1.00, 1.00)
    colors[ImGuiCol.FrameBgHovered]            = ImVec4(0.26, 0.59, 0.98, 0.40)
    colors[ImGuiCol.FrameBgActive]             = ImVec4(0.26, 0.59, 0.98, 0.67)
    colors[ImGuiCol.TitleBg]                   = ImVec4(0.96, 0.96, 0.96, 1.00)
    colors[ImGuiCol.TitleBgActive]             = ImVec4(0.82, 0.82, 0.82, 1.00)
    colors[ImGuiCol.TitleBgCollapsed]          = ImVec4(1.00, 1.00, 1.00, 0.51)
    colors[ImGuiCol.MenuBarBg]                 = ImVec4(0.86, 0.86, 0.86, 1.00)
    colors[ImGuiCol.ScrollbarBg]               = ImVec4(0.98, 0.98, 0.98, 0.53)
    colors[ImGuiCol.ScrollbarGrab]             = ImVec4(0.69, 0.69, 0.69, 0.80)
    colors[ImGuiCol.ScrollbarGrabHovered]      = ImVec4(0.49, 0.49, 0.49, 0.80)
    colors[ImGuiCol.ScrollbarGrabActive]       = ImVec4(0.49, 0.49, 0.49, 1.00)
    colors[ImGuiCol.CheckMark]                 = ImVec4(0.26, 0.59, 0.98, 1.00)
    colors[ImGuiCol.CheckboxSelectedBg]        = ImVec4(0.95, 0.97, 1.00, 1.00)
    colors[ImGuiCol.SliderGrab]                = ImVec4(0.26, 0.59, 0.98, 0.78)
    colors[ImGuiCol.SliderGrabActive]          = ImVec4(0.46, 0.54, 0.80, 0.60)
    colors[ImGuiCol.Button]                    = ImVec4(0.26, 0.59, 0.98, 0.40)
    colors[ImGuiCol.ButtonHovered]             = ImVec4(0.26, 0.59, 0.98, 1.00)
    colors[ImGuiCol.ButtonActive]              = ImVec4(0.06, 0.53, 0.98, 1.00)
    colors[ImGuiCol.Header]                    = ImVec4(0.26, 0.59, 0.98, 0.31)
    colors[ImGuiCol.HeaderHovered]             = ImVec4(0.26, 0.59, 0.98, 0.80)
    colors[ImGuiCol.HeaderActive]              = ImVec4(0.26, 0.59, 0.98, 1.00)
    colors[ImGuiCol.Separator]                 = ImVec4(0.39, 0.39, 0.39, 0.62)
    colors[ImGuiCol.SeparatorHovered]          = ImVec4(0.14, 0.44, 0.80, 0.78)
    colors[ImGuiCol.SeparatorActive]           = ImVec4(0.14, 0.44, 0.80, 1.00)
    colors[ImGuiCol.ResizeGrip]                = ImVec4(0.35, 0.35, 0.35, 0.17)
    colors[ImGuiCol.ResizeGripHovered]         = ImVec4(0.26, 0.59, 0.98, 0.67)
    colors[ImGuiCol.ResizeGripActive]          = ImVec4(0.26, 0.59, 0.98, 0.95)
    colors[ImGuiCol.InputTextCursor]           = colors[ImGuiCol.Text]
    colors[ImGuiCol.TabHovered]                = colors[ImGuiCol.HeaderHovered]
    colors[ImGuiCol.Tab]                       = ImLerpV4V4F(colors[ImGuiCol.Header],       colors[ImGuiCol.TitleBgActive], 0.90)
    colors[ImGuiCol.TabSelected]               = ImLerpV4V4F(colors[ImGuiCol.HeaderActive], colors[ImGuiCol.TitleBgActive], 0.60)
    colors[ImGuiCol.TabSelectedOverline]       = colors[ImGuiCol.HeaderActive]
    colors[ImGuiCol.TabDimmed]                 = ImLerpV4V4F(colors[ImGuiCol.Tab],          colors[ImGuiCol.TitleBg], 0.80)
    colors[ImGuiCol.TabDimmedSelected]         = ImLerpV4V4F(colors[ImGuiCol.TabSelected],  colors[ImGuiCol.TitleBg], 0.40)
    colors[ImGuiCol.TabDimmedSelectedOverline] = ImVec4(0.26, 0.59, 1.00, 0.00)
    colors[ImGuiCol.DockingPreview] = ImVec4(colors[ImGuiCol.Header].x, colors[ImGuiCol.Header].y, colors[ImGuiCol.Header].z, colors[ImGuiCol.Header].w * 0.7)
    colors[ImGuiCol.DockingEmptyBg] = ImVec4(0.68, 0.69, 0.73, 1.00)
    colors[ImGuiCol.PlotLines]                 = ImVec4(0.39, 0.39, 0.39, 1.00)
    colors[ImGuiCol.PlotLinesHovered]          = ImVec4(1.00, 0.43, 0.35, 1.00)
    colors[ImGuiCol.PlotHistogram]             = ImVec4(0.90, 0.70, 0.00, 1.00)
    colors[ImGuiCol.PlotHistogramHovered]      = ImVec4(1.00, 0.45, 0.00, 1.00)
    colors[ImGuiCol.TableHeaderBg]             = ImVec4(0.78, 0.87, 0.98, 1.00)
    colors[ImGuiCol.TableBorderStrong]         = ImVec4(0.57, 0.57, 0.64, 1.00)
    colors[ImGuiCol.TableBorderLight]          = ImVec4(0.68, 0.68, 0.74, 1.00)
    colors[ImGuiCol.TableRowBg]                = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.TableRowBgAlt]             = ImVec4(0.30, 0.30, 0.30, 0.09)
    colors[ImGuiCol.TextLink]                  = colors[ImGuiCol.HeaderActive]
    colors[ImGuiCol.TextSelectedBg]            = ImVec4(0.26, 0.59, 0.98, 0.35)
    colors[ImGuiCol.TreeLines]                 = colors[ImGuiCol.Border]
    colors[ImGuiCol.DragDropTarget]            = ImVec4(0.26, 0.59, 0.98, 0.95)
    colors[ImGuiCol.DragDropTargetBg]          = ImVec4(0.00, 0.00, 0.00, 0.00)
    colors[ImGuiCol.UnsavedMarker]             = ImVec4(0.00, 0.00, 0.00, 1.00)
    colors[ImGuiCol.NavCursor]                 = colors[ImGuiCol.HeaderHovered]
    colors[ImGuiCol.NavWindowingHighlight]     = ImVec4(0.70, 0.70, 0.70, 0.70)
    colors[ImGuiCol.NavWindowingDimBg]         = ImVec4(0.20, 0.20, 0.20, 0.20)
    colors[ImGuiCol.ModalWindowDimBg]          = ImVec4(0.20, 0.20, 0.20, 0.35)
end

--- @param draw_list      ImDrawList
--- @param vert_start_idx int
--- @param vert_end_idx   int
--- @param gradient_p0    ImVec2
--- @param gradient_p1    ImVec2
--- @param col0           ImU32
--- @param col1           ImU32
function ImGui.ShadeVertsLinearColorGradientKeepAlpha(draw_list, vert_start_idx, vert_end_idx, gradient_p0, gradient_p1, col0, col1)
    local gradient_extent = gradient_p1 - gradient_p0
    local gradient_inv_length2 = 1.0 / ImLengthSqr(gradient_extent)

    local col0_r = bit32.band(bit32.rshift(col0, IM_COL32_R_SHIFT), 0xFF)
    local col0_g = bit32.band(bit32.rshift(col0, IM_COL32_G_SHIFT), 0xFF)
    local col0_b = bit32.band(bit32.rshift(col0, IM_COL32_B_SHIFT), 0xFF)

    local col_delta_r = bit32.band(bit32.rshift(col1, IM_COL32_R_SHIFT), 0xFF) - col0_r
    local col_delta_g = bit32.band(bit32.rshift(col1, IM_COL32_G_SHIFT), 0xFF) - col0_g
    local col_delta_b = bit32.band(bit32.rshift(col1, IM_COL32_B_SHIFT), 0xFF) - col0_b

    for vert_idx = vert_start_idx, vert_end_idx - 1 do
        local vert = draw_list.VtxBuffer.Data[vert_idx]

        local d = ImDot(vert[1] - gradient_p0, gradient_extent)
        local t = ImClamp(d * gradient_inv_length2, 0.0, 1.0)

        local r = math.floor(col0_r + col_delta_r * t)
        local g = math.floor(col0_g + col_delta_g * t)
        local b = math.floor(col0_b + col_delta_b * t)

        vert[3] = bit32.bor(bit32.lshift(r, IM_COL32_R_SHIFT), bit32.lshift(g, IM_COL32_G_SHIFT), bit32.lshift(b, IM_COL32_B_SHIFT), bit32.band(vert[3], IM_COL32_A_MASK))
    end
end

-- Rotate and translate vertices [vert_start_idx, vert_end_idx) (1-based, like _VtxCurrentIdx)
function ImGui.ShadeVertsTransformPos(draw_list, vert_start_idx, vert_end_idx, pivot_in, cos_a, sin_a, pivot_out)
    local data = draw_list.VtxBuffer.Data
    local pix, piy, pox, poy = pivot_in.x, pivot_in.y, pivot_out.x, pivot_out.y
    for i = vert_start_idx, vert_end_idx - 1 do
        local pos = data[i][1]
        local x, y = pos[1] - pix, pos[2] - piy
        pos[1] = x * cos_a - y * sin_a + pox
        pos[2] = x * sin_a + y * cos_a + poy
    end
end

-- Distribute UV over (a, b) rectangle
--- @param draw_list      ImDrawList
--- @param vert_start_idx int
--- @param vert_end_idx   int
--- @param a              ImVec2
--- @param b              ImVec2
--- @param uv_a           ImVec2
--- @param uv_b           ImVec2
--- @param clamp          bool
function ImGui.ShadeVertsLinearUV(draw_list, vert_start_idx, vert_end_idx, a, b, uv_a, uv_b, clamp)
    local size = b - a
    local uv_size = uv_b - uv_a
    local scale = ImVec2(
        (size.x ~= 0.0) and (uv_size.x / size.x) or 0.0,
        (size.y ~= 0.0) and (uv_size.y / size.y) or 0.0
    )

    local vertex
    local verts = draw_list.VtxBuffer.Data
    if clamp then
        local min = ImMin(uv_a, uv_b)
        local max = ImMax(uv_a, uv_b)
        for vert_idx = vert_start_idx, vert_end_idx - 1 do
            vertex = verts[vert_idx]
            ImVec2_Copy(vertex[2], ImClamp(uv_a + ImMul(vertex[1] - a, scale), min, max))
        end
    else
        for vert_idx = vert_start_idx, vert_end_idx - 1 do
            vertex = verts[vert_idx]
            ImVec2_Copy(vertex[2], uv_a + ImMul(vertex[1] - a, scale))
        end
    end
end

--- Forward Declarations
local ImFontAtlasTextureAdd
local ImFontAtlasTextureGrow
local ImFontAtlasTextureGetSizeEstimate
local ImFontAtlasTextureBlockCopy
local ImFontAtlasTextureBlockConvert
local ImFontAtlasTextureBlockPostProcess
local ImFontAtlasTextureBlockPostProcessMultiply
local ImFontAtlasTextureBlockQueueUpload
local ImFontAtlasTextureCompact
local ImFontAtlasPackInit
local ImFontAtlasPackAddRect
local ImFontAtlasPackGetRect
local ImFontAtlasPackGetRectSafe
local ImFontAtlasBakedAdd
local ImFontAtlasBakedAddFontGlyph
local ImFontAtlasBakedAddFontGlyphAdvancedX
local ImFontAtlasBakedDiscard
local ImFontAtlasBakedGetOrAdd
local ImFontAtlasBakedGetId
local ImFontAtlasBakedGetClosestMatch
local ImFontAtlasBuildInit
local ImFontAtlasBuildSetTexture
local ImFontAtlasBuildUpdateTexDataLines
local ImFontAtlasBuildUpdateTexDataBasic
local ImFontAtlasBuildSetupFontLoader
local ImFontAtlasBuildSetupFontSpecialGlyphs
local ImFontAtlasBuildSetupFontBakedBlanks
local ImFontAtlasBuildSetupFontBakedEllipsis
local ImFontAtlasBuildSetupFontBakedFallback
local ImFontAtlasBuildDestroy
local ImFontAtlasBuildAcceptCodepointForSource
local ImFontAtlasBuildNotifySetFont
local ImFontAtlasBuildRenderBitmapFromString
local ImFontAtlasFontSourceInit
local ImFontAtlasFontSourceAddToFont
local ImFontAtlasFontDestroySourceData
local ImFontAtlasFontDestroyOutput

local ImFontBaked_BuildGrowIndex
local ImFontBaked_BuildLoadGlyph
local ImFontBaked_BuildLoadGlyphAdvanceX

local ImTextInitClassifiers
local ImTextClassifierGet
local ImTextClassifierClear
local ImTextClassifierSetCharClass
local ImTextClassifierSetCharClassFromStr

local ImTextureDataGetFormatBytesPerPixel

function MT.ImFontAtlas:Clear()
    IMGUI_DEBUG_LOG_FONT("[font] ImFontAtlas:Clear()")
    local backup_renderer_has_textures = self.RendererHasTextures
    self.RendererHasTextures = false
    self:ClearFonts()
    self:ClearTexData()
    self.RendererHasTextures = backup_renderer_has_textures
end

function MT.ImFontAtlas:SetFontLoader(font_loader)
    ImFontAtlasBuildSetupFontLoader(self, font_loader)
end

function MT.ImFontAtlas:ClearInputData()
    IM_ASSERT(not self.Locked, "Cannot modify a locked ImFontAtlas!")

    for _, font in self.Fonts:iter() do
        ImFontAtlasFontDestroyOutput(self, font)
    end
    for _, font_cfg in self.Sources:iter() do
        ImFontAtlasFontDestroySourceData(self, font_cfg)
    end
    for _, font in self.Fonts:iter() do
        font.Sources:clear()
        font.Flags = bit32.bor(font.Flags, ImFontFlags.NoLoadGlyphs)
    end
    self.Sources:clear()
end

function MT.ImFontAtlas:ClearTexData()
    IM_ASSERT(not self.Locked, "Cannot modify a locked ImFontAtlas!")
    IM_ASSERT(self.RendererHasTextures == false, "Not supported for dynamic atlases, but you may call Clear().")

    for _, tex in self.TexList:iter() do
        tex:DestroyPixels()
    end
end

function MT.ImFontAtlas:CompactCache()
    ImFontAtlasTextureCompact(self)
end

function MT.ImFontAtlas:ClearFonts()
    IMGUI_DEBUG_LOG_FONT("[font] ImFontAtlas:ClearFonts()")
    IM_ASSERT(not self.Locked, "Cannot modify a locked ImFontAtlas!")

    for _, font in self.Fonts:iter() do
        ImFontAtlasBuildNotifySetFont(self, font, nil)
    end

    ImFontAtlasBuildDestroy(self)
    self:ClearInputData()
    self.Fonts:clear_delete()
    self.TexIsBuilt = false

    for _, shared_data in self.DrawListSharedDatas:iter() do
        if shared_data.FontAtlas == self then
            shared_data.Font = nil
            shared_data.FontSize = 0.0
            shared_data.FontScale = 0.0
        end
    end
end

--- @param tex ImTextureData
function ImTextureDataUpdateNewFrame(tex)
    local remove_from_list = false
    if tex.Status == ImTextureStatus.OK then
        tex.Updates:resize(0)
        tex.UpdateRect.x = 65535 tex.UpdateRect.y = 65535
        tex.UpdateRect.w = 0     tex.UpdateRect.h = 0
    end

    if (tex.WantDestroyNextFrame and tex.Status ~= ImTextureStatus.Destroyed and tex.Status ~= ImTextureStatus.WantDestroy) then
        IM_ASSERT(tex.Status == ImTextureStatus.OK or tex.Status == ImTextureStatus.WantCreate or tex.Status == ImTextureStatus.WantUpdates)
        tex.Status = ImTextureStatus.WantDestroy
    end

    if (tex.Status == ImTextureStatus.WantDestroy and tex.TexID == ImTextureID_Invalid and tex.BackendUserData == nil and tex.QueueUserData == nil) then
        tex.Status = ImTextureStatus.Destroyed
    end

    if (tex.Status == ImTextureStatus.Destroyed) then
        IM_ASSERT(tex.TexID == ImTextureID_Invalid and tex.BackendUserData == nil, "Backend set texture Status to Destroyed but did not clear TexID/BackendUserData!")
        IM_ASSERT(tex.QueueUserData == nil, "Texture queue set Status to Destroyed but did not clear QueueUserData!")
        if (tex.WantDestroyNextFrame) then
            remove_from_list = true
        else
            tex.Status = ImTextureStatus.WantCreate
        end
    end

    if (tex.Status == ImTextureStatus.WantDestroy) then
        tex.UnusedFrames = tex.UnusedFrames + 1
    end

    return remove_from_list
end

--- @param atlas                 ImFontAtlas
--- @param frame_count           int
--- @param renderer_has_textures any
function ImFontAtlasUpdateNewFrame(atlas, frame_count, renderer_has_textures)
    IM_ASSERT(atlas.Builder == nil or atlas.Builder.FrameCount < frame_count)
    atlas.RendererHasTextures = renderer_has_textures

    local tex_n = 1
    while tex_n <= atlas.TexList.Size do
        local tex = atlas.TexList.Data[tex_n]

        if (tex.Status == ImTextureStatus.WantCreate and atlas.RendererHasTextures) then
            IM_ASSERT(tex.TexID == ImTextureID_Invalid and tex.BackendUserData == nil, "Backend set texture's TexID/BackendUserData but did not update Status to OK.")
        end

        local remove_from_list = ImTextureDataUpdateNewFrame(tex)

        if remove_from_list then
            IM_ASSERT(atlas.TexData ~= tex)
            tex:DestroyPixels()
            atlas.TexList:erase(tex_n)
            tex_n = tex_n - 1
        end

        tex_n = tex_n + 1
    end

    if (atlas.RendererHasTextures) then
        atlas.TexIsBuilt = true
        if (atlas.Builder == nil) then
            ImFontAtlasBuildMain(atlas)
        end
    end

    if (not atlas.RendererHasTextures) then
        IM_ASSERT_USER_ERROR(atlas.TexIsBuilt, "Backend does not support ImGuiBackendFlags.RendererHasTextures, and font atlas is not built! Update backend OR make sure you called ImGui_ImplXXXX_NewFrame() function for renderer backend, which should call io.Fonts->GetTexDataAsRGBA32() / GetTexDataAsAlpha8().")
    end
    if (atlas.TexIsBuilt and atlas.Builder.PreloadedAllGlyphsRanges) then
        IM_ASSERT_USER_ERROR(atlas.RendererHasTextures == false, "Called ImFontAtlas::Build() before ImGuiBackendFlags.RendererHasTextures got set! With new backends: you don't need to call Build().")
    end

    local builder = atlas.Builder
    builder.FrameCount = frame_count
    for _, font in atlas.Fonts:iter() do
        font.LastBaked = nil
    end

    if builder.BakedDiscardedCount > 0 then
        local dst_n = 1

        for src_n = 1, builder.BakedPool.Size do
            repeat
            local p_src = builder.BakedPool.Data[src_n]
            if p_src.WantDestroy then
                break
            end

            local p_dst = builder.BakedPool.Data[dst_n]
            dst_n = dst_n + 1
            if p_dst == p_src then
                break
            end

            builder.BakedPool.Data[dst_n - 1] = p_src
            builder.BakedMap[p_src.BakedId] = p_src

            until true
        end

        IM_ASSERT(dst_n - 1 + builder.BakedDiscardedCount == builder.BakedPool.Size)

        builder.BakedPool.Size = builder.BakedPool.Size - builder.BakedDiscardedCount
        builder.BakedDiscardedCount = 0
    end
end

--- @param src_pixels      unsigned_char[]
--- @param src_fmt         ImTextureFormat
--- @param src_pitch       int
--- @param dst_pixels      unsigned_char[]
--- @param dst_pixels_base int
--- @param dst_fmt         ImTextureFormat
--- @param dst_pitch       int
--- @param w               int
--- @param h               int
function ImFontAtlasTextureBlockConvert(src_pixels, src_fmt, src_pitch, dst_pixels, dst_pixels_base, dst_fmt, dst_pitch, w, h)
    IM_ASSERT(src_pixels ~= nil and dst_pixels ~= nil)
    local src_pixels_base = 1
    if src_fmt == dst_fmt then
        local line_sz = w * ImTextureDataGetFormatBytesPerPixel(src_fmt)
        for ny = h, 1, -1 do
            ImStd.memmove(dst_pixels, dst_pixels_base, src_pixels, src_pixels_base, line_sz)

            src_pixels_base = src_pixels_base + src_pitch
            dst_pixels_base = dst_pixels_base + dst_pitch
        end
    elseif src_fmt == ImTextureFormat.Alpha8 and dst_fmt == ImTextureFormat.RGBA32 then
        for ny = h, 1, -1 do
            for nx = w, 1, -1 do
                local alpha = src_pixels[src_pixels_base + 0]
                src_pixels_base = src_pixels_base + 1

                write_u32(dst_pixels, dst_pixels_base, IM_COL32(255, 255, 255, alpha))
                dst_pixels_base = dst_pixels_base + 4
            end

            src_pixels_base = src_pixels_base + (src_pitch - w)
            dst_pixels_base = dst_pixels_base + (dst_pitch - w * 4)
        end
    elseif src_fmt == ImTextureFormat.RGBA32 and dst_fmt == ImTextureFormat.Alpha8 then
        for ny = h, 1, -1 do
            for nx = w, 1, -1 do
                local alpha = src_pixels[src_pixels_base + 3]
                src_pixels_base = src_pixels_base + 4

                dst_pixels[dst_pixels_base + 0] = alpha
                dst_pixels_base = dst_pixels_base + 1
            end

            src_pixels_base = src_pixels_base + (src_pitch - w * 4)
            dst_pixels_base = dst_pixels_base + (dst_pitch - w)
        end
    else
        IM_ASSERT(false)
    end
end

--- @param data ImFontAtlasPostProcessData
function ImFontAtlasTextureBlockPostProcess(data)
    if data.FontSrc.RasterizerMultiply ~= 1.0 then
        ImFontAtlasTextureBlockPostProcessMultiply(data, data.FontSrc.RasterizerMultiply)
    end
end

--- @param data            ImFontAtlasPostProcessData
--- @param multiply_factor float
function ImFontAtlasTextureBlockPostProcessMultiply(data, multiply_factor)
    local pixels, pixels_base = data.Pixels, data._PixelsBase
    local pitch = data.Pitch
    if data.Format == ImTextureFormat.Alpha8 then
        for ny = data.Height, 1, -1 do
            local p = pixels_base
            for nx = data.Width, 1, -1 do
                local v = ImMin(ImFloor(pixels[p + 0] * multiply_factor), 255)
                pixels[p + 0] = v

                p = p + 1
            end

            pixels_base = pixels_base + pitch
        end
    elseif data.Format == ImTextureFormat.RGBA32 then
        for ny = data.Height, 1, -1 do
            local p = pixels_base
            for nx = data.Width, 1, -1 do
                local a = ImMin(ImFloor(pixels[p + 3] * multiply_factor), 255)

                write_u32(pixels, p, IM_COL32(pixels[p + 0], pixels[p + 1], pixels[p + 2], a))

                p = p + 4
            end

            pixels_base = pixels_base + pitch
        end
    else
        IM_ASSERT(false)
    end
end

--- @param src_tex ImTextureData
--- @param src_x   int
--- @param src_y   int
--- @param dst_tex ImTextureData
--- @param dst_x   int
--- @param dst_y   int
--- @param w       int
--- @param h       int
function ImFontAtlasTextureBlockCopy(src_tex, src_x, src_y, dst_tex, dst_x, dst_y, w, h)
    IM_ASSERT(src_tex.Pixels ~= nil and dst_tex.Pixels ~= nil)
    IM_ASSERT(src_tex.Format == dst_tex.Format)
    IM_ASSERT(src_x >= 0 and src_x + w <= src_tex.Width)
    IM_ASSERT(src_y >= 0 and src_y + h <= src_tex.Height)
    IM_ASSERT(dst_x >= 0 and dst_x + w <= dst_tex.Width)
    IM_ASSERT(dst_y >= 0 and dst_y + h <= dst_tex.Height)
    for y = 0, h - 1 do
        local dst, dst_base = dst_tex:GetPixelsAt(dst_x, dst_y + y)
        local src, src_base = src_tex:GetPixelsAt(src_x, src_y + y)
        ImStd.memmove(dst, dst_base, src, src_base, w * dst_tex.BytesPerPixel)
    end
end

--- @param tex   ImTextureData
--- @param x     int
--- @param y     int
--- @param w     int
--- @param h     int
local function ImTextureDataQueueUpload(tex, x, y, w, h)
    IM_ASSERT(tex.Status ~= ImTextureStatus.WantDestroy and tex.Status ~= ImTextureStatus.Destroyed)
    IM_ASSERT(x >= 0 and x <= 0xFFFF and y >= 0 and y <= 0xFFFF and w >= 0 and x + w <= 0x10000 and h >= 0 and y + h <= 0x10000)

    local req = ImTextureRect(x, y, w, h) -- (unsigned short)
    local new_x1 = ImMax(tex.UpdateRect.w == 0 and 0 or tex.UpdateRect.x + tex.UpdateRect.w, req.x + req.w)
    local new_y1 = ImMax(tex.UpdateRect.h == 0 and 0 or tex.UpdateRect.y + tex.UpdateRect.h, req.y + req.h)
    tex.UpdateRect.x = ImMin(tex.UpdateRect.x, req.x)
    tex.UpdateRect.y = ImMin(tex.UpdateRect.y, req.y)
    tex.UpdateRect.w = (new_x1 - tex.UpdateRect.x) -- (unsigned short)
    tex.UpdateRect.h = (new_y1 - tex.UpdateRect.y) -- (unsigned short)
    tex.UsedRect.x = ImMin(tex.UsedRect.x, req.x)
    tex.UsedRect.y = ImMin(tex.UsedRect.y, req.y)
    tex.UsedRect.w = (ImMax(tex.UsedRect.x + tex.UsedRect.w, req.x + req.w) - tex.UsedRect.x) -- (unsigned short)
    tex.UsedRect.h = (ImMax(tex.UsedRect.y + tex.UsedRect.h, req.y + req.h) - tex.UsedRect.y) -- (unsigned short)

    if (tex.Status == ImTextureStatus.OK or tex.Status == ImTextureStatus.WantUpdates) then
        tex.Status = ImTextureStatus.WantUpdates
        tex.Updates:push_back(req)
    end
end

--- @param atlas ImFontAtlas
--- @param tex   ImTextureData
--- @param x     int
--- @param y     int
--- @param w     int
--- @param h     int
function ImFontAtlasTextureBlockQueueUpload(atlas, tex, x, y, w, h)
    ImTextureDataQueueUpload(tex, x, y, w, h)
    atlas.TexIsBuilt = false
end

--- @param atlas      ImFontAtlas
--- @param baked      ImFontBaked
--- @param src        ImFontConfig
--- @param glyph      ImFontGlyph
--- @param r          ImTextureRect
--- @param src_pixels unsigned_char[]
--- @param src_fmt    ImTextureFormat
--- @param src_pitch  int
local function ImFontAtlasBakedSetFontGlyphBitmap(atlas, baked, src, glyph, r, src_pixels, src_fmt, src_pitch)
    local tex = atlas.TexData
    IM_ASSERT(r.x + r.w <= tex.Width and r.y + r.h <= tex.Height)
    local out_p, out_p_base = tex:GetPixelsAt(r.x, r.y)
    IM_ASSERT(out_p ~= nil)
    ImFontAtlasTextureBlockConvert(src_pixels, src_fmt, src_pitch, out_p, out_p_base, tex.Format, tex:GetPitch(), r.w, r.h)
    local pp_data = ImFontAtlasPostProcessData(atlas, baked.OwnerFont, src, baked, glyph, out_p, out_p_base, tex.Format, tex:GetPitch(), r.w, r.h)
    ImFontAtlasTextureBlockPostProcess(pp_data)
    ImFontAtlasTextureBlockQueueUpload(atlas, tex, r.x, r.y, r.w, r.h)
end

local function ImFontAtlasBuildGetOversampleFactors(src, baked)
    local raster_size = baked.Size * baked.RasterizerDensity * src.RasterizerDensity
    local out_oversample_h
    if src.OversampleH ~= 0 then
        out_oversample_h = src.OversampleH
    elseif raster_size > 36.0 or src.PixelSnapH then
        out_oversample_h = 1
    else
        out_oversample_h = 2
    end
    local out_oversample_v = (src.OversampleV ~= 0) and src.OversampleV or 1
    return out_oversample_h, out_oversample_v
end

local function ImFontAtlasBuildDiscardBakes(atlas, unused_frames)
    local builder = atlas.Builder

    for baked_n = 1, builder.BakedPool.Size do
        repeat
        local baked = builder.BakedPool[baked_n]
        if (baked.LastUsedFrame + unused_frames > atlas.Builder.FrameCount) then
            break
        end

        if (baked.WantDestroy or (bit32.band(baked.OwnerFont.Flags, ImFontFlags.LockBakedSizes) ~= 0)) then
            break
        end

        ImFontAtlasBakedDiscard(atlas, baked.OwnerFont, baked)

        until true
    end
end

--- @param atlas ImFontAtlas
--- @param data  ImDrawListSharedData
function ImFontAtlasAddDrawListSharedData(atlas, data)
    IM_ASSERT(not atlas.DrawListSharedDatas:contains(data))
    atlas.DrawListSharedDatas:push_back(data)
end

--- @param atlas ImFontAtlas
--- @param data  ImDrawListSharedData
function ImFontAtlasRemoveDrawListSharedData(atlas, data)
    IM_ASSERT(atlas.DrawListSharedDatas:contains(data))
    atlas.DrawListSharedDatas:find_erase(data)
end

--- @param atlas ImFontAtlas
--- @param w     int
--- @param h     int
local function ImFontAtlasTextureRepack(atlas, w, h)
    local builder = atlas.Builder
    builder.LockDisableResize = true

    local old_tex = atlas.TexData
    local new_tex = ImFontAtlasTextureAdd(atlas, w, h)
    new_tex.UseColors = old_tex.UseColors

    IMGUI_DEBUG_LOG_FONT("[font] Texture #%03d: resize+repack %dx%d => Texture #%03d: %dx%d", old_tex.UniqueID, old_tex.Width, old_tex.Height, new_tex.UniqueID, new_tex.Width, new_tex.Height)

    ImFontAtlasPackInit(atlas)
    local old_rects = ImVector()
    local old_index = builder.RectsIndex:copy()
    old_rects:swap(builder.Rects)

    for _, index_entry in builder.RectsIndex:iter() do
        repeat
        if index_entry.IsUsed == false then
            break
        end

        local old_r = old_rects[index_entry.TargetIndex + 1]
        if (old_r.w == 0 and old_r.h == 0) then
            break
        end

        local new_r_id = ImFontAtlasPackAddRect(atlas, old_r.w, old_r.h, index_entry)
        if new_r_id == ImFontAtlasRectId_Invalid then
            IMGUI_DEBUG_LOG_FONT("[font] Texture #%03d: resize failed. Will grow.", new_tex.UniqueID)

            new_tex.WantDestroyNextFrame = true
            builder.Rects:swap(old_rects)
            builder.RectsIndex = old_index
            ImFontAtlasBuildSetTexture(atlas, old_tex)
            ImFontAtlasTextureGrow(atlas, w, h)

            return
        end

        IM_ASSERT(ImFontAtlasRectId_GetIndex(new_r_id) == builder.RectsIndex:index_from_ptr(index_entry))

        local new_r = ImFontAtlasPackGetRect(atlas, new_r_id)
        ImFontAtlasTextureBlockCopy(old_tex, old_r.x, old_r.y, new_tex, new_r.x, new_r.y, new_r.w, new_r.h)

        until true
    end
    IM_ASSERT(old_rects.Size == builder.Rects.Size + builder.RectsDiscardedCount)
    builder.RectsDiscardedCount = 0
    builder.RectsDiscardedSurface = 0

    for baked_n = 1, builder.BakedPool.Size do
        for _, glyph in builder.BakedPool[baked_n].Glyphs:iter() do
            if (glyph.PackId ~= ImFontAtlasRectId_Invalid) then
                local r = ImFontAtlasPackGetRect(atlas, glyph.PackId)
                glyph.U0 = (r.x) * atlas.TexUvScale.x
                glyph.V0 = (r.y) * atlas.TexUvScale.y
                glyph.U1 = (r.x + r.w) * atlas.TexUvScale.x
                glyph.V1 = (r.y + r.h) * atlas.TexUvScale.y
            end
        end
    end

    ImFontAtlasBuildUpdateTexData(atlas)

    builder.LockDisableResize = false
    ImFontAtlasUpdateDrawListsSharedData(atlas)
    -- ImFontAtlasDebugWriteTexToDisk(new_tex, "After Pack");
end

function ImFontAtlasTextureGrow(atlas, old_tex_w, old_tex_h)
    local builder = atlas.Builder

    old_tex_w = old_tex_w or -1
    old_tex_h = old_tex_h or -1

    if (old_tex_w == -1) then
        old_tex_w = atlas.TexData.Width
    end
    if (old_tex_h == -1) then
        old_tex_h = atlas.TexData.Height
    end

    IM_ASSERT(ImIsPowerOfTwo(old_tex_w) and ImIsPowerOfTwo(old_tex_h))
    IM_ASSERT(ImIsPowerOfTwo(atlas.TexMinWidth) and ImIsPowerOfTwo(atlas.TexMaxWidth) and ImIsPowerOfTwo(atlas.TexMinHeight) and ImIsPowerOfTwo(atlas.TexMaxHeight))

    local new_tex_w = (old_tex_h <= old_tex_w) and old_tex_w or old_tex_w * 2
    local new_tex_h = (old_tex_h <= old_tex_w) and old_tex_h * 2 or old_tex_h

    local pack_padding = atlas.TexGlyphPadding
    new_tex_w = ImMax(new_tex_w, ImUpperPowerOfTwo(builder.MaxRectSize.x + pack_padding))
    new_tex_h = ImMax(new_tex_h, ImUpperPowerOfTwo(builder.MaxRectSize.y + pack_padding))
    new_tex_w = ImClamp(new_tex_w, atlas.TexMinWidth, atlas.TexMaxWidth)
    new_tex_h = ImClamp(new_tex_h, atlas.TexMinHeight, atlas.TexMaxHeight)
    if (new_tex_w == old_tex_w and new_tex_h == old_tex_h) then
        return
    end

    ImFontAtlasTextureRepack(atlas, new_tex_w, new_tex_h)
end

--- @param atlas ImFontAtlas
local function ImFontAtlasTextureMakeSpace(atlas)
    local builder = atlas.Builder
    ImFontAtlasBuildDiscardBakes(atlas, 2)

    if (builder.RectsDiscardedSurface < builder.RectsPackedSurface * 0.20) then
        ImFontAtlasTextureGrow(atlas)
    else
        ImFontAtlasTextureRepack(atlas, atlas.TexData.Width, atlas.TexData.Height)
    end
end

--- @param atlas    ImFontAtlas
--- @param rect_idx ImFontAtlasRectId
local function ImFontAtlasPackAllocRectEntry(atlas, rect_idx)
    local builder = atlas.Builder
    local index_idx, index_entry
    if builder.RectsIndexFreeListStart < 0 then
        builder.RectsIndex:resize(builder.RectsIndex.Size + 1)
        index_idx = builder.RectsIndex.Size - 1
        index_entry = ImFontAtlasRectEntry()
        builder.RectsIndex.Data[builder.RectsIndex.Size] = index_entry
    else
        index_idx = builder.RectsIndexFreeListStart
        index_entry = builder.RectsIndex[index_idx + 1]
        IM_ASSERT(index_entry.IsUsed == false and index_entry.Generation > 0)
        builder.RectsIndexFreeListStart = index_entry.TargetIndex
    end

    index_entry.TargetIndex = rect_idx
    index_entry.IsUsed = true

    return ImFontAtlasRectId_Make(index_idx, index_entry.Generation)
end

--- @param atlas       ImFontAtlas
--- @param index_entry ImFontAtlasRectEntry
local function ImFontAtlasPackReuseRectEntry(atlas, index_entry)
    IM_ASSERT(index_entry.IsUsed)
    index_entry.TargetIndex = atlas.Builder.Rects.Size - 1
    local index_idx = atlas.Builder.RectsIndex:index_from_ptr(index_entry)
    return ImFontAtlasRectId_Make(index_idx, index_entry.Generation)
end

--- @param atlas ImFontAtlas
--- @param id    ImFontAtlasRectId
function ImFontAtlasPackDiscardRect(atlas, id)
    IM_ASSERT(id ~= ImFontAtlasRectId_Invalid)

    local rect = ImFontAtlasPackGetRect(atlas, id)
    if (rect == nil) then
        return
    end

    local builder = atlas.Builder
    local index_idx = ImFontAtlasRectId_GetIndex(id)
    local index_entry = builder.RectsIndex.Data[index_idx + 1]
    IM_ASSERT(index_entry.IsUsed and index_entry.TargetIndex >= 0)
    index_entry.IsUsed = false
    index_entry.TargetIndex = builder.RectsIndexFreeListStart
    index_entry.Generation = index_entry.Generation + 1
    if (index_entry.Generation == 0) then
        index_entry.Generation = index_entry.Generation + 1
    end

    local pack_padding = atlas.TexGlyphPadding
    builder.RectsIndexFreeListStart = index_idx
    builder.RectsDiscardedCount = builder.RectsDiscardedCount + 1
    builder.RectsDiscardedSurface = builder.RectsDiscardedSurface + ((rect.w + pack_padding) * (rect.h + pack_padding))
    rect.w = 0 rect.h = 0
end

function ImFontAtlasPackAddRect(atlas, w, h, overwrite_entry)
    IM_ASSERT(w > 0 and w <= 0xFFFF)
    IM_ASSERT(h > 0 and h <= 0xFFFF)

    local builder = atlas.Builder
    local pack_padding = atlas.TexGlyphPadding
    builder.MaxRectSize.x = ImMax(builder.MaxRectSize.x, w)
    builder.MaxRectSize.y = ImMax(builder.MaxRectSize.y, h)

    local r = ImTextureRect(0, 0, w, h)
    for attempts_remaining = 3, 0, -1 do
        local pack_r = stbrp.rect()
        pack_r.w = w + pack_padding
        pack_r.h = h + pack_padding
        stbrp.pack_rects(builder.PackContext, {pack_r}, 1)
        r.x = pack_r.x -- (unsigned short)
        r.y = pack_r.y -- (unsigned short)
        if pack_r.was_packed == 1 then
            break
        end

        if (attempts_remaining == 0 or builder.LockDisableResize) then
            IMGUI_DEBUG_LOG_FONT("[font] Failed packing %dx%d rectangle. Returning fallback.", w, h)

            return ImFontAtlasRectId_Invalid
        end

        ImFontAtlasTextureMakeSpace(atlas)
    end

    builder.MaxRectBounds.x = ImMax(builder.MaxRectBounds.x, r.x + r.w + pack_padding)
    builder.MaxRectBounds.y = ImMax(builder.MaxRectBounds.y, r.y + r.h + pack_padding)
    builder.RectsPackedCount = builder.RectsPackedCount + 1
    builder.RectsPackedSurface = builder.RectsPackedSurface + (w + pack_padding) * (h + pack_padding)

    builder.Rects:push_back(r)
    if (overwrite_entry ~= nil) then
        return ImFontAtlasPackReuseRectEntry(atlas, overwrite_entry)
    else
        return ImFontAtlasPackAllocRectEntry(atlas, builder.Rects.Size - 1)
    end
end

--- @param atlas ImFontAtlas
--- @param id    ImFontAtlasRectId
--- @return ImTextureRect
function ImFontAtlasPackGetRect(atlas, id)
    IM_ASSERT(id ~= ImFontAtlasRectId_Invalid)
    local index_idx = ImFontAtlasRectId_GetIndex(id)
    local builder = atlas.Builder
    local index_entry = builder.RectsIndex.Data[index_idx + 1]
    IM_ASSERT(index_entry.Generation == ImFontAtlasRectId_GetGeneration(id))
    IM_ASSERT(index_entry.IsUsed)
    --- @type ImTextureRect
    return builder.Rects.Data[index_entry.TargetIndex + 1]
end

--- @param atlas ImFontAtlas
--- @param id    ImFontAtlasRectId
function ImFontAtlasPackGetRectSafe(atlas, id)
    if id == ImFontAtlasRectId_Invalid then
        return nil
    end

    local index_idx = ImFontAtlasRectId_GetIndex(id)
    if atlas.Builder == nil then
        ImFontAtlasBuildInit(atlas)
    end
    local builder = atlas.Builder
    if index_idx >= builder.RectsIndex.Size then
        return nil
    end
    local index_entry = builder.RectsIndex.Data[index_idx + 1]
    if (index_entry.Generation ~= ImFontAtlasRectId_GetGeneration(id) or not index_entry.IsUsed) then
        return nil
    end
    return builder.Rects.Data[index_entry.TargetIndex + 1]
end

--- @param src       ImFontConfig
--- @param codepoint ImWchar
--- @return bool
function ImFontAtlasBuildAcceptCodepointForSource(src, codepoint)
    local exclude_list = src.GlyphExcludeRanges
    if exclude_list then
        local i = 1
        while exclude_list[i] ~= 0 do
            if codepoint >= exclude_list[i] and codepoint <= exclude_list[i + 1] then
                return false
            end

            i = i + 2
        end
    end

    return true
end

--- @param baked    ImFontBaked
--- @param new_size int
function ImFontBaked_BuildGrowIndex(baked, new_size)
    IM_ASSERT(baked.IndexAdvanceX.Size == baked.IndexLookup.Size)
    if (new_size <= baked.IndexLookup.Size) then
        return
    end
    baked.IndexAdvanceX:resize(new_size, -1.0)
    baked.IndexLookup:resize(new_size, IM_FONTGLYPH_INDEX_UNUSED)
end

--- @class ImGui_ImplStbTrueType_FontSrcData
--- @field FontInfo    stbtt_fontinfo
--- @field ScaleFactor float

--- @return ImGui_ImplStbTrueType_FontSrcData
--- @nodiscard
local function ImGui_ImplStbTrueType_FontSrcData()
    return {
        FontInfo    = stbtt.fontinfo(),
        ScaleFactor = nil
    }
end

-- Need this in Lua since I don't want to include 'stbrp' just for context constructor
-- in ImFontAtlasBuilder def code. The cpp code has 'stbrp_context_opaque' which I don't/can't have here
--- @param atlas ImFontAtlas
local function ImGui_ImplStbTrueType_LoaderInit(atlas)
    atlas.Builder.PackContext = atlas.Builder.PackContext or stbrp.context()
end

local function ImGui_ImplStbTrueType_FontSrcInit(atlas, src)
    -- IM_UNUSED(atlas)

    --- @type ImGui_ImplStbTrueType_FontSrcData?
    local bd_font_data = ImGui_ImplStbTrueType_FontSrcData()
    IM_ASSERT(src.FontLoaderData == nil)

    local font_offset = stbtt.GetFontOffsetForIndex(src.FontData, src.FontNo)
    if font_offset < 0 then
        bd_font_data = nil
        IM_ASSERT_USER_ERROR(0, "stbtt_GetFontOffsetForIndex(): FontData is incorrect, or FontNo cannot be found.")
        return false
    end
    if (not stbtt.InitFont(bd_font_data.FontInfo, src.FontData, font_offset)) then
        bd_font_data = nil
        IM_ASSERT_USER_ERROR(0, "stbtt_InitFont(): failed to parse FontData. It is correct and complete? Check FontDataSize.")
        return false
    end
    src.FontLoaderData = bd_font_data

    local ref_size = src.DstFont.Sources[1].SizePixels
    if (src.MergeMode and src.SizePixels == 0.0) then
        src.SizePixels = ref_size
    end

    bd_font_data.ScaleFactor = stbtt.ScaleForPixelHeight(bd_font_data.FontInfo, 1.0)
    if (src.MergeMode and src.SizePixels ~= 0.0 and ref_size ~= 0.0) then
        bd_font_data.ScaleFactor = bd_font_data.ScaleFactor * (src.SizePixels / ref_size)
    end
    bd_font_data.ScaleFactor = bd_font_data.ScaleFactor * src.ExtraSizeScale

    return true
end

local function ImGui_ImplStbTrueType_FontSrcDestroy(atlas, src)
    -- IM_UNUSED(atlas)
    src.FontLoaderData = nil
end

local function ImGui_ImplStbTrueType_FontSrcContainsGlyph(atlas, src, codepoint)
    -- IM_UNUSED(atlas)
    local bd_font_data = src.FontLoaderData
    IM_ASSERT(bd_font_data ~= nil)

    local glyph_index = stbtt.FindGlyphIndex(bd_font_data.FontInfo, codepoint)
    return (glyph_index ~= 0)
end

local function ImGui_ImplStbTrueType_FontBakedInit(atlas, src, baked)
    -- IM_UNUSED(atlas)

    local bd_font_data = src.FontLoaderData
    if (src.MergeMode == false) then
        local scale_for_layout = bd_font_data.ScaleFactor * baked.Size / src.ExtraSizeScale
        local unscaled_ascent, unscaled_descent, unscaled_line_gap = stbtt.GetFontVMetrics(bd_font_data.FontInfo)

        baked.Ascent = ImCeil(unscaled_ascent * scale_for_layout)
        baked.Descent = ImFloor(unscaled_descent * scale_for_layout)
    end

    return true
end

--- @param atlas      ImFontAtlas
--- @param src        ImFontConfig
--- @param baked      ImFontBaked
--- @param _          any
--- @param codepoint  ImWchar
--- @param out_glyph  ImFontGlyph
--- @param advance_x? float
--- @return bool
--- @return float? out_advance_x # Updated `advance_x`
local function ImGui_ImplStbTrueType_FontBakedLoadGlyph(atlas, src, baked, _, codepoint, out_glyph, advance_x)
    local bd_font_data = src.FontLoaderData
    IM_ASSERT(bd_font_data ~= nil)
    local glyph_index = stbtt.FindGlyphIndex(bd_font_data.FontInfo, codepoint)
    if (glyph_index == 0) then
        return false, advance_x
    end

    local oversample_h, oversample_v = ImFontAtlasBuildGetOversampleFactors(src, baked)
    local scale_for_layout = bd_font_data.ScaleFactor * baked.Size
    local rasterizer_density = src.RasterizerDensity * baked.RasterizerDensity
    local scale_for_raster_x = bd_font_data.ScaleFactor * baked.Size * rasterizer_density * oversample_h
    local scale_for_raster_y = bd_font_data.ScaleFactor * baked.Size * rasterizer_density * oversample_v

    local x0, y0, x1, y1 = stbtt.GetGlyphBitmapBoxSubpixel(bd_font_data.FontInfo, glyph_index, scale_for_raster_x, scale_for_raster_y, 0, 0)
    local advance, lsb = stbtt.GetGlyphHMetrics(bd_font_data.FontInfo, glyph_index)

    if (advance_x ~= nil) then
        IM_ASSERT(out_glyph == nil)
        advance_x = advance * scale_for_layout

        return true, advance_x
    end

    out_glyph.Codepoint = codepoint
    out_glyph.AdvanceX = advance * scale_for_layout

    local is_visible = (x0 ~= x1 and y0 ~= y1)
    if is_visible then
        local w = (x1 - x0 + oversample_h - 1)
        local h = (y1 - y0 + oversample_v - 1)
        local pack_id = ImFontAtlasPackAddRect(atlas, w, h)
        if (pack_id == ImFontAtlasRectId_Invalid) then
            -- Pathological out of memory case (TexMaxWidth/TexMaxHeight set too small?)
            IM_ASSERT(pack_id ~= ImFontAtlasRectId_Invalid, "Out of texture memory.")
            return false, advance_x
        end

        local r = ImFontAtlasPackGetRect(atlas, pack_id)

        x0, y0, x1, y1 = stbtt.GetGlyphBitmapBox(bd_font_data.FontInfo, glyph_index, scale_for_raster_x, scale_for_raster_y)
        local builder = atlas.Builder
        builder.TempBuffer:resize(w * h * 1)
        local bitmap_pixels = builder.TempBuffer.Data
        ImStd.memset(bitmap_pixels, 0, w * h * 1)
        local sub_x, sub_y = stbtt.MakeGlyphBitmapSubpixelPrefilter(bd_font_data.FontInfo, bitmap_pixels, w, h, w,
            scale_for_raster_x, scale_for_raster_y, 0, 0, oversample_h, oversample_v, glyph_index)

        local ref_size = baked.OwnerFont.Sources[1].SizePixels
        local offsets_scale = (ref_size ~= 0.0) and (baked.Size / ref_size) or 1.0
        local font_off_x = ImFloor(src.GlyphOffset.x * offsets_scale + 0.5)
        local font_off_y = ImFloor(src.GlyphOffset.y * offsets_scale + 0.5)
        font_off_x = font_off_x + sub_x
        font_off_y = font_off_y + (sub_y + IM_ROUND(baked.Ascent))
        local recip_h = 1.0 / (oversample_h * rasterizer_density)
        local recip_v = 1.0 / (oversample_v * rasterizer_density)

        out_glyph.X0 = x0 * recip_h + font_off_x
        out_glyph.Y0 = y0 * recip_v + font_off_y
        out_glyph.X1 = (x0 + r.w) * recip_h + font_off_x
        out_glyph.Y1 = (y0 + r.h) * recip_v + font_off_y
        out_glyph.Visible = true
        out_glyph.PackId = pack_id

        ImFontAtlasBakedSetFontGlyphBitmap(atlas, baked, src, out_glyph, r, bitmap_pixels, ImTextureFormat.Alpha8, w)
    end

    return true, advance_x
end

local function ImFontAtlasGetFontLoaderForStbTruetype()
    local loader = ImFontLoader()

    loader.Name                 = "stb_truetype"
    loader.LoaderInit           = ImGui_ImplStbTrueType_LoaderInit
    loader.FontSrcInit          = ImGui_ImplStbTrueType_FontSrcInit
    loader.FontSrcDestroy       = ImGui_ImplStbTrueType_FontSrcDestroy
    loader.FontSrcContainsGlyph = ImGui_ImplStbTrueType_FontSrcContainsGlyph
    loader.FontBakedInit        = ImGui_ImplStbTrueType_FontBakedInit
    loader.FontBakedDestroy     = nil
    loader.FontBakedLoadGlyph   = ImGui_ImplStbTrueType_FontBakedLoadGlyph

    return loader
end

--- @param atlas ImFontAtlas
--- @param baked ImFontBaked
function ImFontAtlasBuildSetupFontBakedBlanks(atlas, baked)
    local space_glyph = baked:FindGlyphNoFallback(32)
    if space_glyph ~= nil then
        space_glyph.Visible = false
    end

    if baked:FindGlyphNoFallback(9) == nil and space_glyph ~= nil then
        local tab_glyph = ImFontGlyph()
        tab_glyph.Codepoint = 9
        tab_glyph.AdvanceX = space_glyph.AdvanceX * IM_TABSIZE
        ImFontAtlasBakedAddFontGlyph(atlas, baked, nil, tab_glyph)
    end
end

--- @param atlas                   ImFontAtlas
--- @param font                    ImFont
--- @param font_size               float
--- @param font_rasterizer_density float
--- @param baked_id                ImGuiID
--- @return ImFontBaked?
function ImFontAtlasBakedAdd(atlas, font, font_size, font_rasterizer_density, baked_id)
    IMGUI_DEBUG_LOG_FONT("[font] Created baked %.2fpx", font_size)

    local baked = atlas.Builder.BakedPool:push_back(ImFontBaked())

    baked.Size              = font_size
    baked.RasterizerDensity = font_rasterizer_density
    baked.BakedId           = baked_id
    baked.OwnerFont         = font
    baked.LastUsedFrame     = atlas.Builder.FrameCount

    local loader_data_size = 0
    for _, src in font.Sources:iter() do
        local loader = src.FontLoader and src.FontLoader or atlas.FontLoader
        loader_data_size = loader_data_size + loader.FontBakedSrcLoaderDataSize
    end
    -- baked.FontLoaderDatas = (loader_data_size > 0) and IM_ALLOC(loader_data_size) or nil
    -- local loader_data_p = baked->FontLoaderDatas
    for _, src in font.Sources:iter() do
        local loader = src.FontLoader and src.FontLoader or atlas.FontLoader
        if (loader.FontBakedInit) then
            loader.FontBakedInit(atlas, src, baked--[[, loader_data_p--]])
        end
        -- loader_data_p += loader->FontBakedSrcLoaderDataSize
    end

    ImFontAtlasBuildSetupFontBakedBlanks(atlas, baked)
    return baked
end

--- @param atlas                   ImFontAtlas
--- @param font                    ImFont
--- @param font_size               float
--- @param font_rasterizer_density float
--- @return ImFontBaked?
function ImFontAtlasBakedGetClosestMatch(atlas, font, font_size, font_rasterizer_density)
    local builder = atlas.Builder

    for step_n = 0, 1 do
        local closest_larger_match
        local closest_smaller_match
        for baked_n = 1, builder.BakedPool.Size do
            repeat
            local baked = builder.BakedPool[baked_n]
            if (baked.OwnerFont ~= font or baked.WantDestroy) then
                break
            end

            if (step_n == 0 and baked.RasterizerDensity ~= font_rasterizer_density) then
                break
            end

            if (baked.Size > font_size and (closest_larger_match == nil or baked.Size < closest_larger_match.Size)) then
                closest_larger_match = baked
            end
            if (baked.Size < font_size and (closest_smaller_match == nil or baked.Size > closest_smaller_match.Size)) then
                closest_smaller_match = baked
            end

            until true
        end
        if (closest_larger_match) then
            if (closest_smaller_match == nil or (closest_larger_match.Size >= font_size * 2.0 and closest_smaller_match.Size > font_size * 0.5)) then
                return closest_larger_match
            end
        end
        if (closest_smaller_match) then
            return closest_smaller_match
        end
    end

    return nil
end

--- @param atlas ImFontAtlas
--- @param font  ImFont
--- @param baked ImFontBaked
function ImFontAtlasBakedDiscard(atlas, font, baked)
    local builder = atlas.Builder

    for _, glyph in baked.Glyphs:iter() do
        if glyph.PackId ~= ImFontAtlasRectId_Invalid then
            ImFontAtlasPackDiscardRect(atlas, glyph.PackId)
        end
    end

    -- char* loader_data_p = (char*)baked->FontLoaderDatas
    for _, src in font.Sources:iter() do
        local loader = src.FontLoader and src.FontLoader or atlas.FontLoader
        if loader.FontBakedDestroy then
            loader.FontBakedDestroy(atlas, src, baked)
        end
    end

    if baked.FontLoaderDatas then
        baked.FontLoaderDatas = nil
    end

    builder.BakedMap[baked.BakedId] = nil
    builder.BakedDiscardedCount = builder.BakedDiscardedCount + 1
    baked:ClearOutputData()
    baked.WantDestroy = true
    font.LastBaked = nil
end

local function ImFontAtlasFontDiscardBakes(atlas, font, unused_frames)
    local builder = atlas.Builder
    if builder then
        for baked_n = 1, builder.BakedPool.Size do
            repeat
            local baked = builder.BakedPool[baked_n]
            if baked.LastUsedFrame + unused_frames > atlas.Builder.FrameCount then
                break
            end

            if (baked.OwnerFont ~= font) or baked.WantDestroy then
                break
            end

            ImFontAtlasBakedDiscard(atlas, font, baked)

            until true
        end
    end
end

function ImFontAtlasFontInitOutput(atlas, font)
    local ret = true
    for _, src in font.Sources:iter() do
        if not ImFontAtlasFontSourceInit(atlas, src) then
            ret = false
        end
    end
    IM_ASSERT(ret)
    return ret
end

function ImFontAtlasFontDestroyOutput(atlas, font)
    font:ClearOutputData()
    for _, src in font.Sources:iter() do
        local loader = src.FontLoader and src.FontLoader or atlas.FontLoader
        if loader and loader.FontSrcDestroy ~= nil then
            loader.FontSrcDestroy(atlas, src)
        end
    end
end

--- @param atlas ImFontAtlas
--- @param src ImFontConfig
--- @return boolean
function ImFontAtlasFontSourceInit(atlas, src)
    local loader = (src.FontLoader) and src.FontLoader or atlas.FontLoader
    if (loader.FontSrcInit ~= nil and not loader.FontSrcInit(atlas, src)) then
        return false
    end
    return true
end

--- @param atlas ImFontAtlas
--- @param font ImFont
--- @param src ImFontConfig
function ImFontAtlasFontSourceAddToFont(atlas, font, src)
    if src.MergeMode == false then
        font:ClearOutputData()
        font.OwnerAtlas = atlas
        IM_ASSERT(font.Sources[1] == src)
    end
    atlas.TexIsBuilt = false
    ImFontAtlasBuildSetupFontSpecialGlyphs(atlas, font, src)
end

--- @param atlas ImFontAtlas
--- @param src ImFontConfig
function ImFontAtlasFontDestroySourceData(atlas, src)
    -- IM_UNUSED(atlas)

    -- if src.FontDataOwnedByAtlas then
    --     IM_FREE(src.FontData)
    -- end
    src.FontData = nil
    -- if src.GlyphExcludeRanges then
    --     IM_FREE(src.GlyphExcludeRanges)
    -- end
    src.GlyphExcludeRanges = nil
end

--- @param atlas ImFontAtlas
--- @param font ImFont
--- @param src ImFontConfig
function ImFontAtlasBuildSetupFontSpecialGlyphs(atlas, font, src)
    -- IM_UNUSED(atlas)
    IM_ASSERT(font.Sources:contains(src))

    --- @type ImWchar[]
    local fallback_chars = {font.FallbackChar, IM_UNICODE_CODEPOINT_INVALID, 63, 32}
    if font.FallbackChar == 0 then
        for _, candidate_char in ipairs(fallback_chars) do
            if candidate_char ~= 0 and font:IsGlyphInFont(candidate_char) then
                font.FallbackChar = candidate_char

                break
            end
        end
    end

    --- @type ImWchar[]
    local ellipsis_chars = {src.EllipsisChar, 0x2026, 0x0085}
    if font.EllipsisChar == 0 then
        for _, candidate_char in ipairs(ellipsis_chars) do
            if candidate_char ~= 0 and font:IsGlyphInFont(candidate_char) then
                font.EllipsisChar = candidate_char

                break
            end
        end
    end

    if font.EllipsisChar == 0 then
        font.EllipsisChar = 0x0085
        font.EllipsisAutoBake = true
    end
end

--- @param atlas ImFontAtlas
--- @param baked ImFontBaked
--- @return ImFontGlyph?
function ImFontAtlasBuildSetupFontBakedEllipsis(atlas, baked)
    local font = baked.OwnerFont
    IM_ASSERT(font.EllipsisChar ~= 0)

    local dot_glyph = baked:FindGlyphNoFallback(46) -- '.'
    if (dot_glyph == nil) then
        dot_glyph = baked:FindGlyphNoFallback(0xFF0E)
    end
    if (dot_glyph == nil) then
        return nil
    end
    local dot_r_id = dot_glyph.PackId
    local dot_r = ImFontAtlasPackGetRect(atlas, dot_r_id)
    local dot_spacing = 1
    local dot_step = (dot_glyph.X1 - dot_glyph.X0) + dot_spacing

    local pack_id = ImFontAtlasPackAddRect(atlas, (dot_r.w * 3 + dot_spacing * 2), dot_r.h)
    local r = ImFontAtlasPackGetRect(atlas, pack_id)

    local glyph = ImFontGlyph()
    glyph.Codepoint = font.EllipsisChar
    glyph.AdvanceX = ImMax(dot_glyph.AdvanceX, dot_glyph.X0 + dot_step * 3.0 - dot_spacing)
    glyph.X0 = dot_glyph.X0
    glyph.Y0 = dot_glyph.Y0
    glyph.X1 = dot_glyph.X0 + dot_step * 3 - dot_spacing
    glyph.Y1 = dot_glyph.Y1
    glyph.Visible = true
    glyph.PackId = pack_id
    glyph = ImFontAtlasBakedAddFontGlyph(atlas, baked, nil, glyph)
    dot_glyph = nil

    dot_r = ImFontAtlasPackGetRect(atlas, dot_r_id)
    local tex = atlas.TexData
    for n = 0, 2 do
        ImFontAtlasTextureBlockCopy(tex, dot_r.x, dot_r.y, tex, r.x + (dot_r.w + dot_spacing) * n, r.y, dot_r.w, dot_r.h)
    end
    ImFontAtlasTextureBlockQueueUpload(atlas, tex, r.x, r.y, r.w, r.h)

    return glyph
end

--- @param baked ImFontBaked
function ImFontAtlasBuildSetupFontBakedFallback(baked)
    IM_ASSERT(baked.FallbackGlyphIndex == -1)
    IM_ASSERT(baked.FallbackAdvanceX == 0.0)
    local font = baked.OwnerFont
    local fallback_glyph
    if (font.FallbackChar ~= 0) then
        fallback_glyph = baked:FindGlyphNoFallback(font.FallbackChar)
    end
    if (fallback_glyph == nil) then
        local space_glyph = baked:FindGlyphNoFallback(32) -- ' '
        local glyph = ImFontGlyph()
        glyph.Codepoint = 0
        glyph.AdvanceX = space_glyph and space_glyph.AdvanceX or IM_ROUND(baked.Size * 0.40)
        fallback_glyph = ImFontAtlasBakedAddFontGlyph(font.OwnerAtlas, baked, nil, glyph)
    end
    baked.FallbackGlyphIndex = baked.Glyphs:index_from_ptr(fallback_glyph) + 1
    baked.FallbackAdvanceX = fallback_glyph.AdvanceX
end

function ImFontAtlasBuildSetupFontLoader(atlas, font_loader)
    if atlas.FontLoader == font_loader then
        return
    end
    IM_ASSERT(not atlas.Locked, "Cannot modify a locked ImFontAtlas!")

    for _, font in atlas.Fonts:iter() do
        ImFontAtlasFontDestroyOutput(atlas, font)
    end
    if atlas.Builder and atlas.FontLoader and atlas.FontLoader.LoaderShutdown then
        atlas.FontLoader.LoaderShutdown(atlas)
    end

    atlas.FontLoader = font_loader
    atlas.FontLoaderName = font_loader and font_loader.Name or "NULL"
    IM_ASSERT(atlas.FontLoaderData == nil)

    if atlas.Builder and atlas.FontLoader and atlas.FontLoader.LoaderInit then
        atlas.FontLoader.LoaderInit(atlas)
    end
    for _, font in atlas.Fonts:iter() do
        ImFontAtlasFontInitOutput(atlas, font)
    end
    for _, font in atlas.Fonts:iter() do
        for _, src in font.Sources:iter() do
            ImFontAtlasFontSourceAddToFont(atlas, font, src)
        end
    end
end

local function ImFontAtlasBuildUpdateRendererHasTexturesFromContext(atlas)
    for _, shared_data in atlas.DrawListSharedDatas:iter() do
        local imgui_ctx = shared_data.Context
        if (imgui_ctx) then
            atlas.RendererHasTextures = bit32.band(imgui_ctx.IO.BackendFlags, ImGuiBackendFlags.RendererHasTextures) ~= 0

            break
        end
    end
end

local function ImFontAtlasBuildUpdatePointers(atlas)
    -- for _, font in atlas.Fonts:iter() do
    --     font.Sources:resize(0)
    -- end
    -- for _, src in atlas.Sources:iter() do
    --     src.DstFont.Sources:push_back(src)
    -- end
end

--- @param atlas   ImFontAtlas
--- @param old_tex ImTextureRef
--- @param new_tex ImTextureRef
local function ImFontAtlasUpdateDrawListsTextures(atlas, old_tex, new_tex)
    for _, shared_data in atlas.DrawListSharedDatas:iter() do
        repeat
        if (shared_data.Context and not shared_data.Context.WithinFrameScope) then
            break
        end

        for _, draw_list in shared_data.DrawLists:iter() do
            if (draw_list.CmdBuffer.Size > 0 and draw_list._CmdHeader.TexRef == old_tex) then
                draw_list:_SetTexture(new_tex)
            end

            for i, stacked_tex in draw_list._TextureStack:iter() do
                if (stacked_tex == old_tex) then
                    draw_list._TextureStack.Data[i] = new_tex
                end
            end
        end

        until true
    end
end

function ImFontAtlasBuildSetTexture(atlas, tex)
    local old_tex_ref = atlas.TexRef
    atlas.TexData = tex
    atlas.TexUvScale = ImVec2(1.0 / tex.Width, 1.0 / tex.Height)
    atlas.TexRef._TexData = tex
    -- atlas->TexRef._TexID = tex->TexID; <-- We intentionally don't do that. It would be misleading and betray promise that both fields aren't set.
    ImFontAtlasUpdateDrawListsTextures(atlas, old_tex_ref, atlas.TexRef)
end

--- @param atlas ImFontAtlas
function ImFontAtlasBuildUpdateTexData(atlas)
    ImFontAtlasBuildUpdateTexDataLines(atlas)
    ImFontAtlasBuildUpdateTexDataBasic(atlas)
end

function ImFontAtlasTextureAdd(atlas, w, h)
    local old_tex = atlas.TexData
    local new_tex

    -- FIXME: Cannot reuse texture because old UV may have been used already (unless we remap UV).
    new_tex = ImTextureData()
    new_tex.UniqueID = atlas.TexNextUniqueID
    atlas.TexNextUniqueID = atlas.TexNextUniqueID + 1
    atlas.TexList:push_back(new_tex)

    if old_tex ~= nil then
        old_tex.WantDestroyNextFrame = true
        IM_ASSERT(old_tex.Status == ImTextureStatus.OK or old_tex.Status == ImTextureStatus.WantCreate or old_tex.Status == ImTextureStatus.WantUpdates)
    end

    new_tex:Create(atlas.TexDesiredFormat, w, h)
    atlas.TexIsBuilt = false

    ImFontAtlasBuildSetTexture(atlas, new_tex)

    return new_tex
end

--- @param atlas ImFontAtlas
--- @return ImVec2
function ImFontAtlasTextureGetSizeEstimate(atlas)
    local min_w = ImUpperPowerOfTwo(atlas.TexMinWidth)
    local min_h = ImUpperPowerOfTwo(atlas.TexMinHeight)
    if (atlas.Builder == nil or atlas.TexData == nil or atlas.TexData.Status == ImTextureStatus.WantDestroy) then
        return ImVec2(min_w, min_h) -- ImVec2i
    end

    local builder = atlas.Builder
    min_w = ImMax(ImUpperPowerOfTwo(builder.MaxRectSize.x), min_w)
    min_h = ImMax(ImUpperPowerOfTwo(builder.MaxRectSize.y), min_h)
    local surface_approx = builder.RectsPackedSurface - builder.RectsDiscardedSurface
    local surface_sqrt = ImFloor(ImSqrt(surface_approx))

    local new_tex_w
    local new_tex_h
    if (min_w >= min_h) then
        new_tex_w = ImMax(min_w, ImUpperPowerOfTwo(surface_sqrt))
        new_tex_h = ImMax(min_h, ImFloor((surface_approx + new_tex_w - 1) / new_tex_w))
        if (bit32.band(atlas.Flags, ImFontAtlasFlags.NoPowerOfTwoHeight) == 0) then
            new_tex_h = ImUpperPowerOfTwo(new_tex_h)
        end
    else
        new_tex_h = ImMax(min_h, ImUpperPowerOfTwo(surface_sqrt))
        if (bit32.band(atlas.Flags, ImFontAtlasFlags.NoPowerOfTwoHeight) == 0) then
            new_tex_h = ImUpperPowerOfTwo(new_tex_h)
        end
        new_tex_w = ImMax(min_w, ImFloor((surface_approx + new_tex_h - 1) / new_tex_h))
    end

    IM_ASSERT(ImIsPowerOfTwo(new_tex_w) and ImIsPowerOfTwo(new_tex_h))
    return ImVec2(new_tex_w, new_tex_h) -- ImVec2i
end

--- @param atlas ImFontAtlas
local function ImFontAtlasBuildClear(atlas)
    local new_tex_size = ImFontAtlasTextureGetSizeEstimate(atlas) -- ImVec2i
    ImFontAtlasBuildDestroy(atlas)
    ImFontAtlasTextureAdd(atlas, new_tex_size.x, new_tex_size.y)
    ImFontAtlasBuildInit(atlas)
    for _, src in atlas.Sources:iter() do
        ImFontAtlasFontSourceInit(atlas, src)
    end
    for _, font in atlas.Fonts:iter() do
        for _, src in font.Sources:iter() do
            ImFontAtlasFontSourceAddToFont(atlas, font, src)
        end
    end
end

--- @param atlas ImFontAtlas
function ImFontAtlasTextureCompact(atlas)
    local builder = atlas.Builder
    ImFontAtlasBuildDiscardBakes(atlas, 1)

    local old_tex = atlas.TexData
    local old_tex_size = ImVec2(old_tex.Width, old_tex.Height)
    local new_tex_size = ImFontAtlasTextureGetSizeEstimate(atlas)
    if (builder.RectsDiscardedCount == 0 and new_tex_size.x == old_tex_size.x and new_tex_size.y == old_tex_size.y) then
        return
    end

    ImFontAtlasTextureRepack(atlas, new_tex_size.x, new_tex_size.y)
end

--- @param atlas ImFontAtlas
function ImFontAtlasPackInit(atlas)
    local tex = atlas.TexData
    local builder = atlas.Builder

    local pack_node_count = ImFloor(tex.Width / 2)
    builder.PackNodes:resize(pack_node_count)
    for i = 1, builder.PackNodes.Size do builder.PackNodes.Data[i] = stbrp.node() end

    stbrp.init_target(builder.PackContext, tex.Width, tex.Height, builder.PackNodes.Data, builder.PackNodes.Size)
    builder.RectsPackedCount = 0
    builder.RectsPackedSurface = 0
    builder.MaxRectSize = ImVec2(0, 0) -- ImVec2i
    builder.MaxRectBounds = ImVec2(0, 0) -- ImVec2i
end

--- @param atlas ImFontAtlas
function ImFontAtlasBuildUpdateTexDataLines(atlas)
    if bit32.band(atlas.Flags, ImFontAtlasFlags.NoBakedLines) ~= 0 then
        return
    end

    local tex = atlas.TexData
    local builder = atlas.Builder

    local r = ImFontAtlasRect()
    local add_and_draw = (atlas:GetCustomRect(builder.PackIdLinesTexData, r) == false)
    if add_and_draw then
        local pack_size = ImVec2(IM_DRAWLIST_TEX_LINES_WIDTH_MAX + 2, IM_DRAWLIST_TEX_LINES_WIDTH_MAX + 1) -- ImVec2i
        builder.PackIdLinesTexData = atlas:AddCustomRect(pack_size.x, pack_size.y, r)
        IM_ASSERT(builder.PackIdLinesTexData ~= ImFontAtlasRectId_Invalid)
    end

    for n = 0, IM_DRAWLIST_TEX_LINES_WIDTH_MAX do
        local y = n
        local line_width = n

        --- @type int # If not floored, will cause black and purple horizontal stripes appearing on the right of the arrow(triangle) in the upper-left most area of the atlas
        local pad_left = math.floor((r.w - line_width) / 2)
        --- @type int
        local pad_right = r.w - (pad_left + line_width)

        IM_ASSERT(pad_left + line_width + pad_right == r.w and y < r.h)

        if (add_and_draw and tex.Format == ImTextureFormat.Alpha8) then
            local write_ptr, write_ptr_base = tex:GetPixelsAt(r.x, r.y + y)

            for i = 0, pad_left - 1 do
                write_ptr[write_ptr_base + i] = 0x00
            end

            for i = 0, line_width - 1 do
                write_ptr[write_ptr_base + pad_left + i] = 0xFF
            end

            for i = 0, pad_right - 1 do
                write_ptr[write_ptr_base + pad_left + line_width + i] = 0x00
            end
        elseif (add_and_draw and tex.Format == ImTextureFormat.RGBA32) then
            local write_ptr, write_ptr_base = tex:GetPixelsAt(r.x, r.y + y)

            for i = 0, pad_left - 1 do
                write_u32(write_ptr, write_ptr_base + i * 4, IM_COL32(255, 255, 255, 0))
            end

            for i = 0, line_width - 1 do
                write_u32(write_ptr, write_ptr_base + (pad_left + i) * 4, IM_COL32_WHITE)
            end

            for i = 0, pad_right - 1 do
                write_u32(write_ptr, write_ptr_base + (pad_left + line_width + i) * 4, IM_COL32(255, 255, 255, 0))
            end
        end

        local uv0 = ImVec2(r.x + pad_left - 1, r.y + y) * atlas.TexUvScale
        local uv1 = ImVec2(r.x + pad_left + line_width + 1, r.y + y + 1) * atlas.TexUvScale
        local half_v = (uv0.y + uv1.y) * 0.5
        atlas.TexUvLines[n] = ImVec4(uv0.x, half_v, uv1.x, half_v)
    end
end

--- @param atlas          ImFontAtlas
--- @param x              int
--- @param y              int
--- @param w              int
--- @param h              int
--- @param in_str         string[]
--- @param in_marker_char string
function ImFontAtlasBuildRenderBitmapFromString(atlas, x, y, w, h, in_str, in_marker_char)
    local tex = atlas.TexData
    IM_ASSERT(x >= 0 and x + w <= tex.Width)
    IM_ASSERT(y >= 0 and y + h <= tex.Height)

    if tex.Format == ImTextureFormat.Alpha8 then
        local out_p, out_p_base = tex:GetPixelsAt(x, y)
        local str_base = 1
        for off_y = 0, h - 1 do
            for off_x = 0, w - 1 do
                out_p[out_p_base + off_x] = (in_str[str_base + off_x] == in_marker_char) and 0xFF or 0x00
            end

            out_p_base = out_p_base + tex.Width
            str_base = str_base + w
        end
    elseif tex.Format == ImTextureFormat.RGBA32 then
        local out_p, out_p_base = tex:GetPixelsAt(x, y)
        local str_base = 1
        for off_y = 0, h - 1 do
            for off_x = 0, w - 1 do
                write_u32(out_p, out_p_base + off_x * 4, (in_str[str_base + off_x] == in_marker_char) and IM_COL32_WHITE or IM_COL32_BLACK_TRANS)
            end

            out_p_base = out_p_base + tex.Width * 4
            str_base = str_base + w
        end
    end
end

--- @param atlas ImFontAtlas
function ImFontAtlasBuildUpdateTexDataBasic(atlas)
    local builder = atlas.Builder
    local pack_size = (bit32.band(atlas.Flags, ImFontAtlasFlags.NoMouseCursors) ~= 0) and ImVec2(2, 2) or ImVec2(FONT_ATLAS_DEFAULT_TEX_DATA_W * 2 + 1, FONT_ATLAS_DEFAULT_TEX_DATA_H)

    local r = ImFontAtlasRect()
    local add_and_draw = (atlas:GetCustomRect(builder.PackIdMouseCursors, r) == false)
    if (add_and_draw) then
        builder.PackIdMouseCursors = atlas:AddCustomRect(pack_size.x, pack_size.y, r)
        IM_ASSERT(builder.PackIdMouseCursors ~= ImFontAtlasRectId_Invalid)

        if bit32.band(atlas.Flags, ImFontAtlasFlags.NoMouseCursors) ~= 0 then
            ImFontAtlasBuildRenderBitmapFromString(atlas, r.x, r.y, 2, 2, {"X", "X", "X", "X"}, "X")
        else
            local x_for_white = r.x
            local x_for_black = r.x + FONT_ATLAS_DEFAULT_TEX_DATA_W + 1
            ImFontAtlasBuildRenderBitmapFromString(atlas, x_for_white, r.y, FONT_ATLAS_DEFAULT_TEX_DATA_W, FONT_ATLAS_DEFAULT_TEX_DATA_H, FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS, ".")
            ImFontAtlasBuildRenderBitmapFromString(atlas, x_for_black, r.y, FONT_ATLAS_DEFAULT_TEX_DATA_W, FONT_ATLAS_DEFAULT_TEX_DATA_H, FONT_ATLAS_DEFAULT_TEX_DATA_PIXELS, "X")
        end
    end

    atlas.TexUvWhitePixel = ImVec2((r.x + 0.5) * atlas.TexUvScale.x, (r.y + 0.5) * atlas.TexUvScale.y)
end

function ImFontAtlasUpdateDrawListsSharedData(atlas)
    for _, shared_data in atlas.DrawListSharedDatas:iter() do
        if (shared_data.FontAtlas == atlas) then
            shared_data.TexUvWhitePixel = atlas.TexUvWhitePixel
            shared_data.TexUvLines = atlas.TexUvLines
        end
    end
end

function ImFontAtlasBuildInit(atlas)
    if atlas.FontLoader == nil then
        -- IMGUI_ENABLE_STB_TRUETYPE
        atlas:SetFontLoader(ImFontAtlasGetFontLoaderForStbTruetype())
    end

    if atlas.TexData == nil or atlas.TexData.Pixels == nil then
        ImFontAtlasTextureAdd(atlas, ImUpperPowerOfTwo(atlas.TexMinWidth), ImUpperPowerOfTwo(atlas.TexMinHeight))
    end
    atlas.Builder = ImFontAtlasBuilder()
    if atlas.FontLoader.LoaderInit then
        atlas.FontLoader.LoaderInit(atlas)
    end

    ImFontAtlasBuildUpdateRendererHasTexturesFromContext(atlas)

    ImFontAtlasPackInit(atlas)

    ImFontAtlasBuildUpdateTexData(atlas)

    ImFontAtlasBuildUpdatePointers(atlas)

    ImFontAtlasUpdateDrawListsSharedData(atlas)

    ImTextInitClassifiers()
end

--- @param atlas ImFontAtlas
function ImFontAtlasBuildDestroy(atlas)
    for _, font in atlas.Fonts:iter() do
        ImFontAtlasFontDestroyOutput(atlas, font)
    end
    if atlas.Builder and atlas.FontLoader and atlas.FontLoader.LoaderShutdown then
        atlas.FontLoader.LoaderShutdown(atlas)
        IM_ASSERT(atlas.FontLoaderData == nil)
    end
    atlas.Builder = nil
end

--- @param atlas    ImFontAtlas
--- @param old_font ImFont?
--- @param new_font ImFont?
function ImFontAtlasBuildNotifySetFont(atlas, old_font, new_font)
    for _, shared_data in atlas.DrawListSharedDatas:iter() do
        if shared_data.Font == old_font then
            shared_data.Font = new_font
        end
        local ctx = shared_data.Context
        if ctx then
            repeat
            if old_font == nil and ctx.Font == nil and ctx.FontSizeBase == 0.0 then
                -- While this should work either way, we save ourselves the bother / debugging confusion of running ImGui code so early when it is not needed.
                -- Also fixes erroneously rewriting style.FontSizeBase during init if adding default fonts.

                break
            end

            if ctx.IO.FontDefault == old_font then
                ctx.IO.FontDefault = new_font
            end
            if ctx.Font == old_font then
                local curr_ctx = ImGui.GetCurrentContext()
                local need_bind_ctx = ctx ~= curr_ctx
                if need_bind_ctx then
                    ImGui.SetCurrentContext(ctx)
                end
                ImGui.SetCurrentFont(new_font, ctx.FontSizeBase, ctx.FontSize)
                if need_bind_ctx then
                    ImGui.SetCurrentContext(curr_ctx)
                end
            end
            for _, font_stack_data in ctx.FontStack:iter() do
                if font_stack_data.Font == old_font then
                    font_stack_data.Font = new_font
                end
            end

            until true
        end
    end
end

--- @param atlas ImFontAtlas
function ImFontAtlasBuildMain(atlas)
    IM_ASSERT(not atlas.Locked, "Cannot modify a locked ImFontAtlas!")
    if (atlas.TexData and atlas.TexData.Format ~= atlas.TexDesiredFormat) then
        ImFontAtlasBuildClear(atlas)
    end

    if atlas.Builder == nil then
        ImFontAtlasBuildInit(atlas)
    end

    -- Default font is none are specified
    if atlas.Sources.Size == 0 then
        atlas:AddFontDefault()
    end

    -- [LEGACY] For backends not supporting RendererHasTextures: preload all glyphs
    -- ImFontAtlasBuildUpdateRendererHasTexturesFromContext(atlas);
    -- if atlas.RendererHasTextures == false then
    --     ImFontAtlasBuildLegacyPreloadAllGlyphRanges(atlas)
    -- end

    atlas.TexIsBuilt = true
end

function MT.ImTextureData:DestroyPixels()
    self.Pixels = nil
    self.UseColors = false
end

function ImTextureDataGetFormatBytesPerPixel(format)
    if format == ImTextureFormat.Alpha8 then
        return 1
    elseif format == ImTextureFormat.RGBA32 then
        return 4
    end
    IM_ASSERT(false)
    return 0
end

function MT.ImTextureData:Create(format, w, h)
    IM_ASSERT(self.Status == ImTextureStatus.Destroyed)
    self:DestroyPixels()
    self.Format = format
    self.Status = ImTextureStatus.WantCreate
    self.Width = w
    self.Height = h
    self.BytesPerPixel = ImTextureDataGetFormatBytesPerPixel(format)
    self.UseColors = false
    self.Pixels = {}
    ImStd.memset(self.Pixels, 0, self.Width * self.Height * self.BytesPerPixel)
    self.UsedRect.x = 0
    self.UsedRect.y = 0
    self.UsedRect.w = 0
    self.UsedRect.h = 0
    self.UpdateRect.x = 65535
    self.UpdateRect.y = 65535
    self.UpdateRect.w = 0
    self.UpdateRect.h = 0
end

function MT.ImFontBaked:ClearOutputData()
    self.FallbackAdvanceX = 0.0
    self.Glyphs:clear()
    self.IndexAdvanceX:clear()
    self.IndexLookup:clear()
    self.FallbackGlyphIndex = -1
    self.Ascent = 0.0
    self.Descent = 0.0
    self.MetricsTotalSurface = 0
end

--- @param c ImWchar
--- @return ImFontGlyph?
function MT.ImFontBaked:FindGlyph(c)
    if c < self.IndexLookup.Size then
        local i = self.IndexLookup.Data[c + 1]
        if i == IM_FONTGLYPH_INDEX_NOT_FOUND then
            return self.Glyphs.Data[self.FallbackGlyphIndex]
        end
        if i ~= IM_FONTGLYPH_INDEX_UNUSED then
            return self.Glyphs.Data[i]
        end
    end

    local glyph = ImFontBaked_BuildLoadGlyph(self, c, nil)
    return (glyph) and glyph or self.Glyphs.Data[self.FallbackGlyphIndex]
end

--- @param c ImWchar
--- @return ImFontGlyph?
function MT.ImFontBaked:FindGlyphNoFallback(c)
    if c < self.IndexLookup.Size then -- IM_LIKELY
        local i = self.IndexLookup.Data[c + 1]
        if i == IM_FONTGLYPH_INDEX_NOT_FOUND then
            return nil
        end
        if i ~= IM_FONTGLYPH_INDEX_UNUSED then
            return self.Glyphs.Data[i]
        end
    end

    self.LoadNoFallback = true
    local glyph = ImFontBaked_BuildLoadGlyph(self, c, nil)
    self.LoadNoFallback = false
    return glyph
end

function MT.ImFont:ClearOutputData()
    local atlas = self.OwnerAtlas
    if atlas ~= nil then
        ImFontAtlasFontDiscardBakes(atlas, self, 0)
    end

    for i = 1, (IM_UNICODE_CODEPOINT_MAX + 1) / 8192 / 8 do self.Used8kPagesMap[i] = 0 end
    self.LastBaked = nil
end

--- @param font_id            ImGuiID
--- @param baked_size         float
--- @param rasterizer_density float
--- @return ImGuiID
function ImFontAtlasBakedGetId(font_id, baked_size, rasterizer_density)
    local hashed_data = {font_id, baked_size, rasterizer_density}
    return ImHashData(hashed_data)
end

--- @param atlas                   ImFontAtlas
--- @param font                    ImFont
--- @param font_size               float
--- @param font_rasterizer_density float
--- @return ImFontBaked?
function ImFontAtlasBakedGetOrAdd(atlas, font, font_size, font_rasterizer_density)
    IM_ASSERT(font_size > 0.0 and font_rasterizer_density > 0.0)
    local baked_id = ImFontAtlasBakedGetId(font.FontId, font_size, font_rasterizer_density)
    local builder = atlas.Builder
    local baked = builder.BakedMap[baked_id]
    if baked ~= nil then
        IM_ASSERT(baked.Size == font_size and baked.OwnerFont == font and baked.BakedId == baked_id)

        return baked
    end

    if (bit32.band(font.Flags, ImFontFlags.LockBakedSizes) ~= 0 or atlas.Locked) then
        baked = ImFontAtlasBakedGetClosestMatch(atlas, font, font_size, font_rasterizer_density)
        if baked ~= nil then
            return baked
        end
        if atlas.Locked then
            IM_ASSERT(not atlas.Locked, "Cannot use dynamic font size with a locked ImFontAtlas!")
            return nil
        end
    end

    baked = ImFontAtlasBakedAdd(atlas, font, font_size, font_rasterizer_density, baked_id)
    builder.BakedMap[baked_id] = baked

    return baked
end

--- @param atlas    ImFontAtlas
--- @param baked    ImFontBaked
--- @param src?     ImFontConfig
--- @param in_glyph ImFontGlyph
--- @return ImFontGlyph
function ImFontAtlasBakedAddFontGlyph(atlas, baked, src, in_glyph)
    local glyph_idx = baked.Glyphs.Size + 1
    baked.Glyphs:push_back(in_glyph)
    local glyph = baked.Glyphs.Data[glyph_idx]
    IM_ASSERT(baked.Glyphs.Size < 0xFFFE)

    if (glyph.PackId ~= ImFontAtlasRectId_Invalid) then
        local r = ImFontAtlasPackGetRect(atlas, glyph.PackId)
        IM_ASSERT(glyph.U0 == 0.0 and glyph.V0 == 0.0 and glyph.U1 == 0.0 and glyph.V1 == 0.0)
        glyph.U0 = (r.x) * atlas.TexUvScale.x
        glyph.V0 = (r.y) * atlas.TexUvScale.y
        glyph.U1 = (r.x + r.w) * atlas.TexUvScale.x
        glyph.V1 = (r.y + r.h) * atlas.TexUvScale.y
        baked.MetricsTotalSurface = baked.MetricsTotalSurface + r.w * r.h
    end

    if (src ~= nil) then
        local ref_size = baked.OwnerFont.Sources[1].SizePixels
        local offsets_scale = (ref_size ~= 0.0) and (baked.Size / ref_size) or 1.0
        local advance_x = ImClamp(glyph.AdvanceX, src.GlyphMinAdvanceX * offsets_scale, src.GlyphMaxAdvanceX * offsets_scale)
        if (advance_x ~= glyph.AdvanceX) then
            local char_off_x = src.PixelSnapH and ImTrunc((advance_x - glyph.AdvanceX) * 0.5) or (advance_x - glyph.AdvanceX) * 0.5
            glyph.X0 = glyph.X0 + char_off_x
            glyph.X1 = glyph.X1 + char_off_x
        end

        if (src.PixelSnapH) then
            advance_x = IM_ROUND(advance_x)
        end

        glyph.AdvanceX = advance_x + src.GlyphExtraAdvanceX
    end
    if (glyph.Colored) then
        atlas.TexData.UseColors  = true
        atlas.TexPixelsUseColors = true
    end

    local codepoint = glyph.Codepoint
    ImFontBaked_BuildGrowIndex(baked, codepoint + 1)
    baked.IndexAdvanceX.Data[codepoint + 1] = glyph.AdvanceX
    baked.IndexLookup.Data[codepoint + 1] = glyph_idx -- (ImU16)
    local page_n = math.floor(codepoint / 8192)
    baked.OwnerFont.Used8kPagesMap[bit32.rshift(page_n, 3) + 1] = bit32.bor(baked.OwnerFont.Used8kPagesMap[bit32.rshift(page_n, 3) + 1], bit32.lshift(1, bit32.band(page_n, 7)))

    return glyph
end

--- @param atlas     ImFontAtlas
--- @param baked     ImFontBaked
--- @param src?      ImFontConfig
--- @param codepoint ImWchar
--- @param advance_x float
function ImFontAtlasBakedAddFontGlyphAdvancedX(atlas, baked, src, codepoint, advance_x)
    -- IM_UNUSED(atlas)
    if (src ~= nil) then
        local ref_size = baked.OwnerFont.Sources[1].SizePixels
        local offsets_scale = (ref_size ~= 0.0) and (baked.Size / ref_size) or 1.0
        advance_x = ImClamp(advance_x, src.GlyphMinAdvanceX * offsets_scale, src.GlyphMaxAdvanceX * offsets_scale)

        if (src.PixelSnapH) then
            advance_x = IM_ROUND(advance_x)
        end

        advance_x = advance_x + src.GlyphExtraAdvanceX
    end

    ImFontBaked_BuildGrowIndex(baked, codepoint + 1)
    baked.IndexAdvanceX.Data[codepoint + 1] = advance_x
end

--- @param size    float
--- @param density float?
--- @return ImFontBaked?
function MT.ImFont:GetFontBaked(size, density)
    if not density then density = -1.0 end

    --- @type ImFontBaked?
    local baked = self.LastBaked

    size = ImGui.GetRoundedFontSize(size)

    if density < 0.0 then
        density = self.CurrentRasterizerDensity
    end
    if baked and baked.Size == size and baked.RasterizerDensity == density then
        return baked
    end

    local atlas = self.OwnerAtlas
    local builder = atlas.Builder
    baked = ImFontAtlasBakedGetOrAdd(atlas, self, size, density)
    if baked == nil then
        return nil
    end
    baked.LastUsedFrame = builder.FrameCount
    self.LastBaked = baked

    return baked
end

--- @param atlas ImFontAtlas
--- @param font  ImFont
--- @param c     ImWchar
--- @return ImWchar
--- @nodiscard
local function ImFontAtlas_FontHookRemapCodepoint(atlas, font, c)
    -- IM_UNUSED(atlas)
    if #font.RemapPairs > 0 then
        local ret = font.RemapPairs[c]
        return (ret ~= nil) and ret or c
    end

    return c
end

--- @param baked                ImFontBaked
--- @param codepoint            ImWchar
--- @param only_load_advance_x? float
--- @return ImFontGlyph?
--- @return float?       # Updated `only_load_advance_x`
function ImFontBaked_BuildLoadGlyph(baked, codepoint, only_load_advance_x)
    local font = baked.OwnerFont
    local atlas = font.OwnerAtlas
    if atlas.Locked or bit32.band(font.Flags, ImFontFlags.NoLoadGlyphs) ~= 0 then
        if baked.FallbackGlyphIndex == -1 and baked.LoadNoFallback == false then
            ImFontAtlasBuildSetupFontBakedFallback(baked)
        end

        return nil, only_load_advance_x
    end

    local src_codepoint = codepoint
    codepoint = ImFontAtlas_FontHookRemapCodepoint(atlas, font, codepoint)

    if (codepoint == font.EllipsisChar and font.EllipsisAutoBake) then
        local glyph = ImFontAtlasBuildSetupFontBakedEllipsis(atlas, baked)
        if (glyph) then
            return glyph, only_load_advance_x
        end
    end

    local loader_user_data_p = baked.FontLoaderDatas
    local src_n = 1
    for _, src in font.Sources:iter() do
        local loader = src.FontLoader and src.FontLoader or atlas.FontLoader

        if (not src.GlyphExcludeRanges or ImFontAtlasBuildAcceptCodepointForSource(src, codepoint)) then
            if only_load_advance_x == nil then
                local glyph_buf = ImFontGlyph()

                if loader.FontBakedLoadGlyph(atlas, src, baked, loader_user_data_p, codepoint, glyph_buf, nil) then
                    glyph_buf.Codepoint = src_codepoint
                    glyph_buf.SourceIdx = src_n

                    return ImFontAtlasBakedAddFontGlyph(atlas, baked, src, glyph_buf)
                end
            else
                local ret --[[@as bool]]
                ret, only_load_advance_x = loader.FontBakedLoadGlyph(atlas, src, baked, loader_user_data_p, codepoint, nil, only_load_advance_x)
                if ret then
                    --- @cast only_load_advance_x float
                    ImFontAtlasBakedAddFontGlyphAdvancedX(atlas, baked, src, codepoint, only_load_advance_x)

                    return nil, only_load_advance_x
                end
            end
        end

        -- loader_user_data_p = loader_user_data_p + loader.FontBakedSrcLoaderDataSize
        src_n = src_n + 1
    end

    if (baked.LoadNoFallback) then
        return nil, only_load_advance_x
    end
    if (baked.FallbackGlyphIndex == -1) then
        ImFontAtlasBuildSetupFontBakedFallback(baked)
    end

    ImFontBaked_BuildGrowIndex(baked, codepoint + 1);
    baked.IndexAdvanceX.Data[codepoint + 1] = baked.FallbackAdvanceX
    baked.IndexLookup.Data[codepoint + 1] = IM_FONTGLYPH_INDEX_NOT_FOUND

    return nil, only_load_advance_x
end

--- @param baked ImFontBaked
--- @param codepoint ImWchar
--- @return float
function ImFontBaked_BuildLoadGlyphAdvanceX(baked, codepoint)
    if (baked.Size >= IMGUI_FONT_SIZE_THRESHOLD_FOR_LOADADVANCEXONLYMODE) or baked.LoadNoRenderOnLayout then
        local only_advance_x
        local glyph
        glyph, only_advance_x = ImFontBaked_BuildLoadGlyph(baked, codepoint, only_advance_x)
        --- @cast only_advance_x float
        return glyph and glyph.AdvanceX or only_advance_x
    else
        local glyph = ImFontBaked_BuildLoadGlyph(baked, codepoint, nil)
        return glyph and glyph.AdvanceX or baked.FallbackAdvanceX
    end
end

--- @param c ImWchar
--- @return bool
function MT.ImFont:IsGlyphInFont(c)
    local atlas = self.OwnerAtlas
    c = ImFontAtlas_FontHookRemapCodepoint(atlas, self, c)
    for _, src in self.Sources:iter() do
        local loader = src.FontLoader and src.FontLoader or atlas.FontLoader
        if loader.FontSrcContainsGlyph ~= nil and loader.FontSrcContainsGlyph(atlas, src, c) then
            return true
        end
    end

    return false
end

--- @param c ImWchar
--- @return float
function MT.ImFontBaked:GetCharAdvance(c)
    if c < self.IndexAdvanceX.Size then
        local x = self.IndexAdvanceX.Data[c + 1]
        if x >= 0.0 then
            return x
        end
    end
    return ImFontBaked_BuildLoadGlyphAdvanceX(self, c)
end

function BuildLoadGlyphGetAdvanceOrFallback(baked, codepoint)
    return ImFontBaked_BuildLoadGlyphAdvanceX(baked, codepoint)
end

--- @param text       ImString
--- @param text_begin int
--- @param text_end   int
--- @param flags      ImDrawTextFlags
--- @return int
local function ImTextCalcWordWrapNextLineStart(text, text_begin, text_end, flags)
    local pos = text_begin

    if bit32.band(flags, ImDrawTextFlags.WrapKeepBlanks) == 0 then
        while pos < text_end and ImCharIsBlankA(ImStrByte(text, pos)) do
            pos = pos + 1
        end
    end

    if pos < text_end and ImStrByte(text, pos) == 10 then -- '\n'
        pos = pos + 1
    end

    return pos
end

--- @param bits          ImU32[]
--- @param codepoint_min unsigned_int
--- @param codepoint_end unsigned_int
--- @param char_class    ImWcharClass
function ImTextClassifierClear(bits, codepoint_min, codepoint_end, char_class)
    for c = codepoint_min, codepoint_end - 1 do
        ImTextClassifierSetCharClass(bits, codepoint_min, codepoint_end, char_class, c)
    end
end

--- @param bits          ImU32[]
--- @param codepoint_min unsigned_int
--- @param codepoint_end unsigned_int
--- @param char_class    ImWcharClass
--- @param c             unsigned_int
function ImTextClassifierSetCharClass(bits, codepoint_min, codepoint_end, char_class, c)
    IM_ASSERT(c >= codepoint_min and c < codepoint_end)
    -- IM_UNUSED(codepoint_end)
    c = c - codepoint_min
    local shift = bit32.lshift(bit32.band(c, 15), 1)
    bits[bit32.rshift(c, 4) + 1] = bit32.bor(bit32.band(bits[bit32.rshift(c, 4) + 1], bit32.bnot(bit32.lshift(0x03, shift))), bit32.lshift(char_class, shift))
end

function ImTextClassifierSetCharClassFromStr(bits, codepoint_min, codepoint_end, char_class, s)
    local s_end = #s + 1
    local pos = 1
    while (pos < s_end) do
        local wanted, c = ImStd.ImTextCharFromUtf8(s, pos, s_end)
        pos = pos + wanted
        ImTextClassifierSetCharClass(bits, codepoint_min, codepoint_end, char_class, c)
    end
end

function ImTextClassifierGet(_BITS, _CHAR_OFFSET)
    return bit32.band(bit32.rshift(_BITS[bit32.rshift(_CHAR_OFFSET, 4) + 1], bit32.lshift(bit32.band(_CHAR_OFFSET, 15), 1)), 0x03)
end

local g_CharClassifierIsSeparator_0000_007f = {} for i = 1, 128 / 16 do g_CharClassifierIsSeparator_0000_007f[i] = 0 end
local g_CharClassifierIsSeparator_3000_300f = {} for i = 1, 16 / 16 do g_CharClassifierIsSeparator_3000_300f[i] = 0 end

function ImTextInitClassifiers()
    if (ImTextClassifierGet(g_CharClassifierIsSeparator_0000_007f, 44) ~= 0) then
        return
    end

    ImTextClassifierClear(g_CharClassifierIsSeparator_0000_007f, 0, 128, ImWcharClass.Other)
    ImTextClassifierSetCharClassFromStr(g_CharClassifierIsSeparator_0000_007f, 0, 128, ImWcharClass.Blank, " \t")
    ImTextClassifierSetCharClassFromStr(g_CharClassifierIsSeparator_0000_007f, 0, 128, ImWcharClass.Punct, ".,;!?\"")

    ImTextClassifierClear(g_CharClassifierIsSeparator_3000_300f, 0x3000, 0x300F, ImWcharClass.Other)
    ImTextClassifierSetCharClass(g_CharClassifierIsSeparator_3000_300f, 0x3000, 0x300F, ImWcharClass.Blank, 0x3000)
    ImTextClassifierSetCharClass(g_CharClassifierIsSeparator_3000_300f, 0x3000, 0x300F, ImWcharClass.Punct, 0x3001)
    ImTextClassifierSetCharClass(g_CharClassifierIsSeparator_3000_300f, 0x3000, 0x300F, ImWcharClass.Punct, 0x3002)
end

--- @param font       ImFont
--- @param size       float
--- @param text       ImString
--- @param pos        int
--- @param text_end   int
--- @param wrap_width float
--- @param flags      ImDrawTextFlags
--- @return int
function ImFontCalcWordWrapPositionEx(font, size, text, pos, text_end, wrap_width, flags)
    local baked = font:GetFontBaked(size)
    local scale = size / baked.Size

    local line_width = 0.0
    local blank_width = 0.0
    wrap_width = wrap_width / scale

    local s = pos
    IM_ASSERT(text_end ~= nil)

    local prev_type = ImWcharClass.Other
    local keep_blanks = bit32.band(flags, ImDrawTextFlags.WrapKeepBlanks) ~= 0

    local span_end = s
    local span_width = 0.0

    local stop = false
    while s < text_end do
        repeat
        --- @type unsigned_int
        local c = ImStrByte(text, s)
        local next_s
        if c < 0x80 then
            next_s = s + 1
        else
            local wanted, out_char = ImStd.ImTextCharFromUtf8(text, s, text_end)
            c = out_char
            next_s = s + wanted
        end

        if c < 32 then
            if c == 10 then -- '\n'
                return s
            end
            if c == 13 then -- '\r'
                s = next_s

                break
            end
        end

        local char_width = (c < baked.IndexAdvanceX.Size) and baked.IndexAdvanceX.Data[c + 1] or -1.0
        if char_width < 0.0 then
            char_width = BuildLoadGlyphGetAdvanceOrFallback(baked, c)
        end

        local curr_type
        if c < 128 then
            curr_type = ImTextClassifierGet(g_CharClassifierIsSeparator_0000_007f, c)
        elseif (c >= 0x3000 and c < 0x3010) then
            curr_type = ImTextClassifierGet(g_CharClassifierIsSeparator_3000_300f, bit32.band(c, 15))
        else
            curr_type = ImWcharClass.Other
        end

        if curr_type == ImWcharClass.Blank then
            if (prev_type ~= ImWcharClass.Blank and not keep_blanks) then
                span_end = s
                line_width = line_width + span_width
                span_width = 0.0
            end

            blank_width = blank_width + char_width
        else
            if (prev_type == ImWcharClass.Punct and curr_type ~= ImWcharClass.Punct and not (c >= 48 and c <= 57)) then
                span_end = s
                line_width = line_width + (span_width + blank_width)
                blank_width = 0.0
                span_width = 0.0
            elseif (prev_type == ImWcharClass.Blank and keep_blanks) then
                span_end = s
                line_width = line_width + (span_width + blank_width)
                blank_width = 0.0
                span_width = 0.0
            end

            span_width = span_width + char_width
        end

        if (span_width + blank_width + line_width > wrap_width) then
            if span_width + blank_width > wrap_width then
                stop = true; break
            end

            return span_end
        end

        prev_type = curr_type
        s = next_s

        until true
        if stop then break end
    end

    if s == pos and s < text_end then
        local bytes = ImStd.ImTextCountUtf8BytesFromChar(text, s, text_end)

        return s + bytes
    end

    return s
end

--- @param font              ImFont
--- @param size              float
--- @param max_width         float
--- @param wrap_width        float
--- @param text              ImString
--- @param text_begin        int
--- @param text_end_display? int
--- @param text_end?         int
--- @param out_offset?       ImVec2
--- @param flags             ImDrawTextFlags
--- @return ImVec2 text_size
--- @return int    remaining
function ImFontCalcTextSizeEx(font, size, max_width, wrap_width, text, text_begin, text_end_display, text_end, out_offset, flags)
    if not text_end then
        text_end = #text + 1
    end
    if not text_end_display then
        text_end_display = text_end
    end

    local baked = font:GetFontBaked(size)
    local line_height = size
    local scale = line_height / baked.Size

    local text_size = ImVec2()
    local line_width = 0.0

    local word_wrap_enabled = (wrap_width > 0.0)
    local word_wrap_eol

    local s = text_begin
    local stop = false
    while s < text_end_display do
        repeat
        if word_wrap_enabled then
            if not word_wrap_eol then
                word_wrap_eol = ImFontCalcWordWrapPositionEx(font, size, text, s, text_end, wrap_width - line_width, flags)
            end

            if s >= word_wrap_eol then
                if text_size.x < line_width then
                    text_size.x = line_width
                end
                text_size.y = text_size.y + line_height
                line_width = 0.0
                s = ImTextCalcWordWrapNextLineStart(text, s, text_end, flags)
                if bit32.band(flags, ImDrawTextFlags.StopOnNewLine) ~= 0 then
                    stop = true; break
                end
                word_wrap_eol = nil

                break
            end
        end

        local prev_s = s
        local c = ImStrByte(text, s)
        if c < 0x80 then
            s = s + 1
        else
            local wanted, out_char = ImStd.ImTextCharFromUtf8(text, s, text_end)
            c = out_char
            s = s + wanted
        end

        if c == 10 then -- '\n'
            text_size.x = ImMax(text_size.x, line_width)
            text_size.y = text_size.y + line_height
            line_width = 0.0
            if bit32.band(flags, ImDrawTextFlags.StopOnNewLine) ~= 0 then
                stop = true; break
            end

            break
        end

        if c == 13 then -- '\r'
            break
        end

        local char_width = (c < baked.IndexAdvanceX.Size) and baked.IndexAdvanceX.Data[c + 1] or -1.0
        if (char_width < 0.0) then
            char_width = BuildLoadGlyphGetAdvanceOrFallback(baked, c)
        end
        char_width = char_width * scale

        if (line_width + char_width >= max_width) then
            s = prev_s
            stop = true; break
        end

        line_width = line_width + char_width

        until true
        if stop then break end
    end

    if (text_size.x < line_width) then
        text_size.x = line_width
    end

    if out_offset then
        out_offset.x = line_width
        out_offset.y = text_size.y + line_height
    end

    if (line_width > 0 or text_size.y == 0.0) then
        text_size.y = text_size.y + line_height
    end

    local out_remaining = s

    return text_size, out_remaining
end

--- @param size       float
--- @param max_width  float
--- @param wrap_width float
--- @param text       ImString
--- @param text_begin int
--- @param text_end?  int
function MT.ImFont:CalcTextSizeA(size, max_width, wrap_width, text, text_begin, text_end)
    return ImFontCalcTextSizeEx(self, size, max_width, wrap_width, text, text_begin, text_end, text_end, nil, ImDrawTextFlags.None)
end

--- Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound.
--- @param draw_list     ImDrawList
--- @param size          float
--- @param pos           ImVec2
--- @param col           ImU32
--- @param c             ImWchar
--- @param cpu_fine_clip ImVec4
function MT.ImFont:RenderChar(draw_list, size, pos, col, c, cpu_fine_clip)
    local baked = self:GetFontBaked(size)
    local glyph = baked:FindGlyph(c)
    if not glyph or not glyph.Visible then
        return
    end
    if glyph.Colored then
        col = bit32.bor(col, bit32.bnot(IM_COL32_A_MASK))
    end

    local scale
    if size >= 0.0 then
        scale = size / baked.Size
    else
        scale = 1.0
    end

    local x = pos.x
    local y = pos.y
    if bit32.band(draw_list.Flags, ImDrawListFlags.TextNoPixelSnap) == 0 then
        x = IM_TRUNC(x)
        y = IM_TRUNC(y)
    end

    local x1 = x + glyph.X0 * scale
    local x2 = x + glyph.X1 * scale
    if cpu_fine_clip and (x1 > cpu_fine_clip.z or x2 < cpu_fine_clip.x) then
        return
    end

    local y1 = y + glyph.Y0 * scale
    local y2 = y + glyph.Y1 * scale
    local u1 = glyph.U0
    local v1 = glyph.V0
    local u2 = glyph.U1
    local v2 = glyph.V1

    -- Always CPU fine clip. Code extracted from RenderText().
    -- CPU side clipping used to fit text in their frame when the frame is too small. Only does clipping for axis aligned quads.
    if cpu_fine_clip then
        if x1 < cpu_fine_clip.x then u1 = u1 + (1.0 - (x2 - cpu_fine_clip.x) / (x2 - x1)) * (u2 - u1); x1 = cpu_fine_clip.x end
        if y1 < cpu_fine_clip.y then v1 = v1 + (1.0 - (y2 - cpu_fine_clip.y) / (y2 - y1)) * (v2 - v1); y1 = cpu_fine_clip.y end
        if x2 > cpu_fine_clip.z then u2 = u1 + ((cpu_fine_clip.z - x1) / (x2 - x1)) * (u2 - u1); x2 = cpu_fine_clip.z end
        if y2 > cpu_fine_clip.w then v2 = v1 + ((cpu_fine_clip.w - y1) / (y2 - y1)) * (v2 - v1); y2 = cpu_fine_clip.w end
        if y1 >= y2 then return end
    end
    draw_list:PrimReserve(6, 4)
    draw_list:PrimRectUV(ImVec2(x1, y1), ImVec2(x2, y2), ImVec2(u1, v1), ImVec2(u2, v2), col)
end

function MT.ImFontAtlas:AddFont(font_cfg_in)
    IM_ASSERT(not self.Locked, "Cannot modify a locked ImFontAtlas!")
    IM_ASSERT((font_cfg_in.FontData ~= nil and font_cfg_in.FontDataSize > 0) or (font_cfg_in.FontLoader ~= nil))
    IM_ASSERT(font_cfg_in.SizePixels > 0.0, "Is ImFontConfig struct correctly initialized?")
    IM_ASSERT(font_cfg_in.RasterizerDensity > 0.0, "Is ImFontConfig struct correctly initialized?")

    if font_cfg_in.GlyphOffset.x ~= 0.0 or font_cfg_in.GlyphOffset.y ~= 0.0 or
        font_cfg_in.GlyphMinAdvanceX ~= 0.0 or font_cfg_in.GlyphMaxAdvanceX ~= FLT_MAX then
        IM_ASSERT(font_cfg_in.SizePixels ~= 0.0,
            "Specifying glyph offset/advances requires a reference size to base it on.")
    end

    if self.Builder == nil then
        ImFontAtlasBuildInit(self)
    end

    local is_first_font = (self.Fonts.Size == 0)
    local font
    if not font_cfg_in.MergeMode then
        font = ImFont()
        font.FontId = self.FontNextUniqueID
        self.FontNextUniqueID = self.FontNextUniqueID + 1
        font.Flags = font_cfg_in.Flags
        font.LegacySize = font_cfg_in.SizePixels
        font.CurrentRasterizerDensity = font_cfg_in.RasterizerDensity
        self.Fonts:push_back(font)
    else
        IM_ASSERT(self.Fonts.Size > 0, "Cannot use MergeMode for the first font!")
        font = (font_cfg_in.DstFont ~= nil) and font_cfg_in.DstFont or self.Fonts:back()
        ImFontAtlasFontDiscardBakes(self, font, 0)
    end

    self.Sources:push_back(font_cfg_in)
    local font_cfg = self.Sources:back()
    if (font_cfg.DstFont == nil) then
        font_cfg.DstFont = font
    end
    font.Sources:push_back(font_cfg)
    ImFontAtlasBuildUpdatePointers(self)

    if font_cfg.GlyphExcludeRanges ~= nil then
        local size = 0
        for _, v in ipairs(font_cfg.GlyphExcludeRanges) do if v == 0 then break end size = size + 1 end
        IM_ASSERT(bit32.band(size, 1) == 0, "GlyphExcludeRanges[] size must be multiple of two!")
        IM_ASSERT(size <= 64, "GlyphExcludeRanges[] size must be small!")
    end

    if font_cfg.FontLoader ~= nil then
        IM_ASSERT(font_cfg.FontLoader.FontBakedLoadGlyph ~= nil)
        IM_ASSERT(font_cfg.FontLoader.LoaderInit == nil and font_cfg.FontLoader.LoaderShutdown == nil)
    end
    if font_cfg_in.MergeMode and font_cfg_in.SizePixels > 0 then
        IM_ASSERT(bit32.band(font.Flags, ImFontFlags.ImplicitRefSize) == 0, "Cannot use MergeMode with an explicit reference size when the destination font used an implicit reference size!")
    end
    IM_ASSERT(font_cfg.FontLoaderData == nil)

    if not ImFontAtlasFontSourceInit(self, font_cfg) then
        ImFontAtlasFontDestroySourceData(self, font_cfg)
        self.Sources:pop_back()
        font.Sources:pop_back()
        if not font_cfg.MergeMode then
            font = nil
            self.Fonts:pop_back()
        end
        return nil
    end
    ImFontAtlasFontSourceAddToFont(self, font, font_cfg)

    if (is_first_font) then
        ImFontAtlasBuildNotifySetFont(self, nil, font)
    end

    return font
end

--- @param ctx ImGuiContext
--- @return float
local function GetExpectedContextFontSize(ctx)
    return ((ctx.Style.FontSizeBase > 0.0) and ctx.Style.FontSizeBase or 13.0) * ctx.Style.FontScaleMain * ctx.Style.FontScaleDpi
end

--- @param font_cfg ImFontConfig
function MT.ImFontAtlas:AddFontDefault(font_cfg)
    if self.OwnerContext == nil or GetExpectedContextFontSize(self.OwnerContext) >= 15.0 then
        return self:AddFontDefaultVector(font_cfg)
    else
        return self:AddFontDefaultBitmap(font_cfg)
    end
end

function MT.ImFontAtlas:AddFontFromMemoryTTF(font_data, font_data_size, size_pixels, font_cfg_template, glyph_ranges)
    IM_ASSERT(not self.Locked, "Cannot modify a locked ImFontAtlas!")
    local font_cfg = font_cfg_template and font_cfg_template or ImFontConfig()
    IM_ASSERT(font_cfg.FontData == nil)
    IM_ASSERT(font_data_size > 100, "Incorrect value for font_data_size!")
    font_cfg.FontData = font_data
    font_cfg.FontDataSize = font_data_size
    font_cfg.SizePixels = (size_pixels > 0.0) and size_pixels or font_cfg.SizePixels
    if glyph_ranges then
        font_cfg.GlyphRanges = glyph_ranges
    end
    return self:AddFont(font_cfg)
end

-- TODO: GetDefaultCompressedFontDataProggyClean, GetDefaultCompressedFontDataProggyForever
function MT.ImFontAtlas:AddFontFromMemoryCompressedTTF()
    -- TODO:
end

function MT.ImFontAtlas:AddFontFromFileTTF(filename, size_pixels, font_cfg_template, glyph_ranges)
    IM_ASSERT(not self.Locked, "Cannot modify a locked ImFontAtlas!")

    local data, data_size = ImStd.ImFileLoadToMemory(filename, "rb")
    if not data then
        if (font_cfg_template == nil or (bit32.band(font_cfg_template.Flags, ImFontFlags.NoLoadError) == 0)) then
            -- IMGUI_DEBUG_LOG("While loading '%s'\n", filename)
            IM_ASSERT_USER_ERROR(0, "Could not load font file!")
        end

        return nil
    end

    local font_cfg = font_cfg_template and font_cfg_template or ImFontConfig()
    if not font_cfg.Name or font_cfg.Name == "" then
        for i = #filename, 1, -1 do
            local c = string.byte(filename, i, i)
            if (c == 47 or c == 92) then -- '/' or '\\'
                font_cfg.Name = string.sub(filename, i + 1)
                break
            end
        end
    end

    return self:AddFontFromMemoryTTF(data, data_size, size_pixels, font_cfg, glyph_ranges)
end

function GetDefaultFontDataProggyClean()
    return ImStd.ImFileLoadToMemory("resource/fonts/ProggyClean.ttf", "rb")
end

function GetDefaultFontDataProggyForever()
    return ImStd.ImFileLoadToMemory("resource/fonts/ProggyForever.ttf", "rb")
end

-- TODO: IMGUI_DISABLE_DEFAULT_FONT, IMGUI_DISABLE_DEFAULT_FONT_BITMAP
--- @param font_cfg_template ImFontConfig
function MT.ImFontAtlas:AddFontDefaultBitmap(font_cfg_template)
    local font_cfg = font_cfg_template and font_cfg_template or ImFontConfig()
    if not font_cfg_template then
        font_cfg.PixelSnapH = true
    end
    if font_cfg.SizePixels <= 0.0 then
        font_cfg.SizePixels = 13.0
        font_cfg.Flags = bit32.bor(font_cfg.Flags, ImFontFlags.ImplicitRefSize)
    end
    if not font_cfg.Name or font_cfg.Name == "" then
        font_cfg.Name = "ProggyClean.ttf"
    end
    font_cfg.EllipsisChar = 0x0085
    font_cfg.GlyphOffset.y = font_cfg.GlyphOffset.y +  1.0 * (font_cfg.SizePixels / 13.0)

    local ttf_data, ttf_data_size = GetDefaultFontDataProggyClean()
    return self:AddFontFromMemoryTTF(ttf_data, ttf_data_size, font_cfg.SizePixels, font_cfg)
end

--- @param font_cfg_template ImFontConfig
function MT.ImFontAtlas:AddFontDefaultVector(font_cfg_template)
    local font_cfg = font_cfg_template and font_cfg_template or ImFontConfig()
    if not font_cfg_template then
        font_cfg.PixelSnapH = true
    end
    if font_cfg.SizePixels <= 0.0 then
        font_cfg.SizePixels = 13.0
        font_cfg.Flags = bit32.bor(font_cfg.Flags, ImFontFlags.ImplicitRefSize)
    end
    if not font_cfg.Name or font_cfg.Name == "" then
        font_cfg.Name = "ProggyForever.ttf"
    end
    font_cfg.ExtraSizeScale = font_cfg.ExtraSizeScale * 1.015
    font_cfg.GlyphOffset.y = font_cfg.GlyphOffset.y + 0.5 * (font_cfg.SizePixels / 16.0)

    local ttf_data, ttf_data_size = GetDefaultFontDataProggyForever()
    return self:AddFontFromMemoryTTF(ttf_data, ttf_data_size, font_cfg.SizePixels, font_cfg)
end

function MT.ImFontAtlas:GetCustomRect(id, out_r)
    local r = ImFontAtlasPackGetRectSafe(self, id)
    if r == nil then
        return false
    end
    IM_ASSERT(self.TexData.Width > 0 and self.TexData.Height > 0)
    if out_r == nil then
        return true
    end
    out_r.x = r.x
    out_r.y = r.y
    out_r.w = r.w
    out_r.h = r.h
    ImVec2_Copy(out_r.uv0, ImVec2((r.x), (r.y)) * self.TexUvScale)
    ImVec2_Copy(out_r.uv1, ImVec2((r.x + r.w), (r.y + r.h)) * self.TexUvScale)

    return true
end

--- @param atlas         ImFontAtlas
--- @param cursor_type   ImGuiMouseCursor
--- @param out_offset    ImVec2
--- @param out_size      ImVec2
--- @param out_uv_border ImVec2[]
--- @param out_uv_fill   ImVec2[]
function ImFontAtlasGetMouseCursorTexData(atlas, cursor_type, out_offset, out_size, out_uv_border, out_uv_fill)
    if cursor_type <= ImGuiMouseCursor.None or cursor_type >= ImGuiMouseCursor.COUNT then
        return false
    end
    if bit32.band(atlas.Flags, ImFontAtlasFlags.NoMouseCursors) ~= 0 then
        return false
    end

    local r = ImFontAtlasPackGetRect(atlas, atlas.Builder.PackIdMouseCursors)
    local pos = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type + 1][1] + ImVec2(r.x, r.y)
    local size = FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type + 1][2]
    ImVec2_Copy(out_size, size)
    ImVec2_Copy(out_offset, FONT_ATLAS_DEFAULT_TEX_CURSOR_DATA[cursor_type + 1][3])
    ImVec2_Copy(out_uv_border[1], (pos) * atlas.TexUvScale)
    ImVec2_Copy(out_uv_border[2], (pos + size) * atlas.TexUvScale)
    pos.x = pos.x + (FONT_ATLAS_DEFAULT_TEX_DATA_W + 1)
    ImVec2_Copy(out_uv_fill[1], (pos) * atlas.TexUvScale)
    ImVec2_Copy(out_uv_fill[2], (pos + size) * atlas.TexUvScale)

    return true
end

function MT.ImFontAtlas:AddCustomRect(width, height, out_r)
    IM_ASSERT(width > 0 and width <= 0xFFFF)
    IM_ASSERT(height > 0 and height <= 0xFFFF)

    if (self.Builder == nil) then
        ImFontAtlasBuildInit(self)
    end

    local r_id = ImFontAtlasPackAddRect(self, width, height)
    if (r_id == ImFontAtlasRectId_Invalid) then
        return ImFontAtlasRectId_Invalid
    end
    if (out_r ~= nil) then
        self:GetCustomRect(r_id, out_r)
    end

    if (self.RendererHasTextures) then
        local r = ImFontAtlasPackGetRect(self, r_id)
        ImFontAtlasTextureBlockQueueUpload(self, self.TexData, r.x, r.y, r.w, r.h)
    end

    return r_id
end

local function IM_NORMALIZE2F_OVER_ZERO(VX, VY)
    local d2 = VX * VX + VY * VY
    if d2 > 0.0 then
        local inv_len = ImRsqrt(d2)
        VX = VX * inv_len
        VY = VY * inv_len
    end
    return VX, VY
end

local function IM_FIXNORMAL2F(VX, VY)
    local IM_FIXNORMAL2F_MAX_INVLEN2 = 100

    local d2 = VX * VX + VY * VY
    if d2 > 0.000001 then
        local inv_len2 = 1.0 / d2
        if inv_len2 > IM_FIXNORMAL2F_MAX_INVLEN2 then
            inv_len2 = IM_FIXNORMAL2F_MAX_INVLEN2
        end
        VX = VX * inv_len2
        VY = VY * inv_len2
    end
    return VX, VY
end

function MT.ImDrawData:Clear()
    self.Valid = false
    self.FrameCount = 0; self.TotalIdxCount = 0; self.TotalVtxCount = 0
    self.CmdLists:resize(0)
    self.DisplayPos       = ImVec2(0.0, 0.0)
    self.DisplaySize      = ImVec2(0.0, 0.0)
    self.FramebufferScale = ImVec2(0.0, 0.0)
    self.OwnerViewport    = nil
    self.Textures         = nil
end

function ImGui.AddDrawListToDrawDataEx(draw_data, out_list, draw_list)
    if draw_list.CmdBuffer.Size == 0 then
        return
    end
    if draw_list.CmdBuffer.Size == 1 and draw_list.CmdBuffer.Data[1].ElemCount == 0 and draw_list.CmdBuffer.Data[1].UserCallback == nil then
        return
    end

    IM_ASSERT(draw_list.VtxBuffer.Size == 0 or draw_list._VtxWritePtr == draw_list.VtxBuffer.Size + 1)
    IM_ASSERT(draw_list.IdxBuffer.Size == 0 or draw_list._IdxWritePtr == draw_list.IdxBuffer.Size + 1)
    if (bit32.band(draw_list.Flags, ImDrawListFlags.AllowVtxOffset) == 0) then
        IM_ASSERT(draw_list._VtxCurrentIdx == draw_list.VtxBuffer.Size + 1)
    end

    out_list:push_back(draw_list)
    draw_data.TotalVtxCount = draw_data.TotalVtxCount + draw_list.VtxBuffer.Size
    draw_data.TotalIdxCount = draw_data.TotalIdxCount + draw_list.IdxBuffer.Size
end

function MT.ImDrawData:AddDrawList(draw_list)
    draw_list:_PopUnusedDrawCmd()
    ImGui.AddDrawListToDrawDataEx(self, self.CmdLists, draw_list)
end

local IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN = 4
local IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX = 512

local function IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(_RAD, _MAXERROR) return ImClamp(IM_ROUNDUP_TO_EVEN(ImCeil(IM_PI / ImAcos(1 - ImMin(_MAXERROR, _RAD) / _RAD))), IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MIN, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX) end
local function IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC_R(_N, _MAXERROR) return (_MAXERROR / (1 - ImCos(IM_PI / ImMax(_N, IM_PI)))) end
local function IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC_ERROR(_N, _RAD)  return ((1 - ImCos(IM_PI / ImMax(_N, IM_PI))) / _RAD) end

function MT.ImDrawListSharedData:SetCircleTessellationMaxError(max_error)
    if self.CircleTessellationMaxError == max_error then
        return
    end

    IM_ASSERT(max_error > 0)

    self.CircleTessellationMaxError = max_error
    for i = 1, 64 do -- IM_COUNTOF(CircleSegmentCounts)
        local radius = (i - 1)
        self.CircleSegmentCounts[i] = (i > 1) and IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(radius, self.CircleTessellationMaxError) or IM_DRAWLIST_ARCFAST_SAMPLE_MAX
    end

    self.ArcFastRadiusCutoff = IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC_R(IM_DRAWLIST_ARCFAST_SAMPLE_MAX, self.CircleTessellationMaxError)
end

--- @param data ImDrawListSharedData
function MT.ImDrawList:_SetDrawListSharedData(data)
    if self._Data ~= nil then
        self._Data.DrawLists:find_erase_unsorted(self)
    end
    self._Data = data
    if self._Data ~= nil then
        self._Data.DrawLists:push_back(self)
    end
end

-- TODO:
function MT.ImDrawList:_ResetForNewFrame()
    if self._Splitter._Count > 1 then
        self._Splitter:Merge(self)
    end
    self._Splitter._Current = 0 -- [Lua] recover from an error thrown mid-split
    self._Splitter._Count = 1

    self.CmdBuffer:resize(0)
    self.IdxBuffer:resize(0)
    self.VtxBuffer:resize(0)
    self.Flags = self._Data.InitialFlags

    self._CmdHeader = ImDrawCmdHeader() -- memset(&_CmdHeader, 0, sizeof(_CmdHeader))

    self._VtxCurrentIdx = 1
    self._VtxWritePtr = 1
    self._IdxWritePtr = 1
    self._ClipRectStack:resize(0)
    self._TextureStack:resize(0)
    self._Path:resize(0)

    self.CmdBuffer:push_back(ImDrawCmd())

    self._FringeScale = self._Data.InitialFringeScale
end

function MT.ImDrawList:_ClearFreeMemory()
    self.CmdBuffer:clear()
    self.IdxBuffer:clear()
    self.VtxBuffer:clear()

    self.Flags = ImDrawListFlags.None

    self._VtxCurrentIdx = 1
    self._VtxWritePtr = 1
    self._IdxWritePtr = 1

    self._ClipRectStack:clear()
    self._TextureStack:clear()
    -- self._CallbacksDataBuf:clear()
    self._Path:clear()
    self._Splitter:ClearFreeMemory()
end

function MT.ImDrawList:AddDrawCmd()
    local draw_cmd = ImDrawCmd()

    ImVec4_Copy(draw_cmd.ClipRect, self._CmdHeader.ClipRect) -- Same as calling ImDrawCmd_HeaderCopy()?
    draw_cmd.TexRef = self._CmdHeader.TexRef
    draw_cmd.VtxOffset = self._CmdHeader.VtxOffset
    draw_cmd.IdxOffset = self.IdxBuffer.Size

    IM_ASSERT(draw_cmd.ClipRect.x <= draw_cmd.ClipRect.z and draw_cmd.ClipRect.y <= draw_cmd.ClipRect.w)
    self.CmdBuffer:push_back(draw_cmd)
end

function MT.ImDrawList:_PopUnusedDrawCmd()
    while self.CmdBuffer.Size > 0 do
        local curr_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
        if curr_cmd.ElemCount ~= 0 or curr_cmd.UserCallback ~= nil then
            break
        end

        self.CmdBuffer:pop_back()
    end
end

--- @param callback       ImDrawCallback
--- @param userdata       any
--- @param userdata_size? size_t
function MT.ImDrawList:AddCallback(callback, userdata, userdata_size)
    if userdata_size == nil then userdata_size = 0 end

    IM_ASSERT(callback ~= nil)
    IM_ASSERT_PARANOID(self.CmdBuffer.Size > 0)

    local curr_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
    IM_ASSERT(curr_cmd.UserCallback == nil)
    if curr_cmd.ElemCount ~= 0 then
        self:AddDrawCmd()
        curr_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
    end
    curr_cmd.UserCallback = callback
    -- TODO: _CallbacksDataBuf?
    if userdata_size == 0 then
        curr_cmd.UserCallbackData = userdata

    else
        IM_ASSERT(userdata ~= nil)
        IM_ASSERT(userdata_size < bit32.lshift(1, 31))

    end

    self:AddDrawCmd()
end

--- Compare ClipRect, TexRef, VtxOffset
--- @param CMD_LHS ImDrawCmd|ImDrawCmdHeader
--- @param CMD_RHS ImDrawCmd|ImDrawCmdHeader
--- @return bool
local function ImDrawCmd_HeaderCompare(CMD_LHS, CMD_RHS)
    if CMD_LHS.ClipRect.x ~= CMD_RHS.ClipRect.x or
        CMD_LHS.ClipRect.y ~= CMD_RHS.ClipRect.y or
        CMD_LHS.ClipRect.z ~= CMD_RHS.ClipRect.z or
        CMD_LHS.ClipRect.w ~= CMD_RHS.ClipRect.w then
        return false
    end

    if CMD_LHS.TexRef._TexData ~= CMD_RHS.TexRef._TexData or
        CMD_LHS.TexRef._TexID ~= CMD_RHS.TexRef._TexID then
        return false
    end

    if CMD_LHS.VtxOffset ~= CMD_RHS.VtxOffset then
        return false
    end

    return true
end

--- Copy ClipRect, TexRef, VtxOffset
--- @param CMD_DST ImDrawCmd|ImDrawCmdHeader
--- @param CMD_SRC ImDrawCmd|ImDrawCmdHeader
local function ImDrawCmd_HeaderCopy(CMD_DST, CMD_SRC)
    CMD_DST.ClipRect.x = CMD_SRC.ClipRect.x
    CMD_DST.ClipRect.y = CMD_SRC.ClipRect.y
    CMD_DST.ClipRect.z = CMD_SRC.ClipRect.z
    CMD_DST.ClipRect.w = CMD_SRC.ClipRect.w

    CMD_DST.TexRef._TexData = CMD_SRC.TexRef._TexData
    CMD_DST.TexRef._TexID = CMD_SRC.TexRef._TexID

    CMD_DST.VtxOffset = CMD_SRC.VtxOffset
end

--- @param CMD_0 ImDrawCmd
--- @param CMD_1 ImDrawCmd
local function ImDrawCmd_AreSequentialIdxOffset(CMD_0, CMD_1)
    return CMD_0.IdxOffset + CMD_0.ElemCount == CMD_1.IdxOffset
end

function MT.ImDrawList:_TryMergeDrawCmds()
    IM_ASSERT_PARANOID(self.CmdBuffer.Size > 0)
    local curr_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
    local prev_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size - 1]
    if ImDrawCmd_HeaderCompare(curr_cmd, prev_cmd) and ImDrawCmd_AreSequentialIdxOffset(prev_cmd, curr_cmd) and curr_cmd.UserCallback == nil and prev_cmd.UserCallback == nil then
        prev_cmd.ElemCount = prev_cmd.ElemCount + curr_cmd.ElemCount
        self.CmdBuffer:pop_back()
    end
end

function MT.ImDrawList:_OnChangedClipRect()
    IM_ASSERT_PARANOID(self.CmdBuffer.Size > 0)
    local curr_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
    if (curr_cmd.ElemCount ~= 0 and self._CmdHeader.ClipRect ~= curr_cmd.ClipRect) then
        self:AddDrawCmd()

        return
    end

    IM_ASSERT(curr_cmd.UserCallback == nil)

    local prev_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size - 1]
    if (curr_cmd.ElemCount == 0 and self.CmdBuffer.Size > 1 and ImDrawCmd_HeaderCompare(self._CmdHeader, prev_cmd) and ImDrawCmd_AreSequentialIdxOffset(prev_cmd, curr_cmd) and prev_cmd.UserCallback == nil) then
        self.CmdBuffer:pop_back()

        return
    end

    ImVec4_Copy(curr_cmd.ClipRect, self._CmdHeader.ClipRect)
end

function MT.ImDrawList:_OnChangedTexture()
    IM_ASSERT_PARANOID(self.CmdBuffer.Size > 0)
    local curr_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
    if curr_cmd.ElemCount ~= 0 and curr_cmd.TexRef ~= self._CmdHeader.TexRef then
        self:AddDrawCmd()

        return
    end

    if curr_cmd.UserCallback ~= nil then
        return
    end

    local prev_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size - 1]
    if curr_cmd.ElemCount == 0 and self.CmdBuffer.Size > 1 and ImDrawCmd_HeaderCompare(self._CmdHeader, prev_cmd) and ImDrawCmd_AreSequentialIdxOffset(prev_cmd, curr_cmd) and prev_cmd.UserCallback == nil then
        self.CmdBuffer:pop_back()

        return
    end

    curr_cmd.TexRef = self._CmdHeader.TexRef
end

function MT.ImDrawList:_OnChangedVtxOffset()
    self._VtxCurrentIdx = 1
    IM_ASSERT_PARANOID(self.CmdBuffer.Size > 0)

    local curr_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
    if curr_cmd.ElemCount ~= 0 then
        self:AddDrawCmd()
        return
    end
    IM_ASSERT(curr_cmd.UserCallback == nil)
    curr_cmd.VtxOffset = self._CmdHeader.VtxOffset
end

----------------------------------------------------------------
-- [SECTION] ImDrawListSplitter
----------------------------------------------------------------
-- Lua: channels swap ImVector objects with the draw list (C++ memcpy of the vector headers).
-- Channel 0 holds nothing while it is the current channel (its buffers live in the draw list).

-- Copy ClipRect, TexRef, VtxOffset (TexRef is assigned by reference, never mutated)
local function ImDrawCmd_HeaderCopyRef(dst, src)
    ImVec4_Copy(dst.ClipRect, src.ClipRect)
    dst.TexRef = src.TexRef
    dst.VtxOffset = src.VtxOffset
end

function MT.ImDrawListSplitter:Clear()
    self._Current = 0
    self._Count = 1
end

function MT.ImDrawListSplitter:ClearFreeMemory()
    for i = 1, self._Channels.Size do
        local ch = self._Channels.Data[i]
        if i - 1 == self._Current then
            -- Current channel is a copy of CmdBuffer/IdxBuffer, don't destruct again
            self._Channels.Data[i] = ImDrawChannel()
        else
            ch._CmdBuffer:clear()
            ch._IdxBuffer:clear()
        end
    end
    self._Current = 0
    self._Count = 1
    self._Channels:clear()
end

--- @param draw_list      ImDrawList
--- @param channels_count int
function MT.ImDrawListSplitter:Split(draw_list, channels_count)
    IM_ASSERT(self._Current == 0 and self._Count <= 1, "Nested channel splitting is not supported. Please use separate instances of ImDrawListSplitter.")
    local old_channels_count = self._Channels.Size
    if old_channels_count < channels_count then
        self._Channels:reserve(channels_count)
        self._Channels:resize(channels_count)
    end
    self._Count = channels_count

    -- Channel 0 is the draw list itself (memset to 0 in C++)
    local channels = self._Channels.Data
    channels[1] = { _CmdBuffer = nil, _IdxBuffer = nil }
    for i = 2, channels_count do
        if i > old_channels_count or channels[i] == nil then
            channels[i] = ImDrawChannel()
        else
            channels[i]._CmdBuffer:resize(0)
            channels[i]._IdxBuffer:resize(0)
        end
    end
end

--- @param draw_list ImDrawList
function MT.ImDrawListSplitter:Merge(draw_list)
    -- Note that we never use or rely on _Channels.Size because it is merely a buffer that we never shrink back to 0 to keep all sub-buffers ready for use.
    if self._Count <= 1 then
        return
    end

    self:SetCurrentChannel(draw_list, 0)
    draw_list:_PopUnusedDrawCmd()

    -- Calculate our final buffer sizes. Also fix the incorrect IdxOffset values in each command.
    local new_cmd_buffer_count = 0
    local new_idx_buffer_count = 0
    local last_cmd = (self._Count > 0 and draw_list.CmdBuffer.Size > 0) and draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size] or nil
    local idx_offset = last_cmd and (last_cmd.IdxOffset + last_cmd.ElemCount) or 0
    local channels = self._Channels.Data
    for i = 2, self._Count do
        local ch = channels[i]
        local cmds = ch._CmdBuffer
        if cmds.Size > 0 and cmds.Data[cmds.Size].ElemCount == 0 and cmds.Data[cmds.Size].UserCallback == nil then -- Equivalent of PopUnusedDrawCmd()
            cmds:pop_back()
        end

        if cmds.Size > 0 and last_cmd ~= nil then
            -- Do not include ImDrawCmd_AreSequentialIdxOffset() in the compare as we rebuild IdxOffset values ourselves.
            -- Manipulating IdxOffset (e.g. by reordering draw commands like done by RenderDimmedBackgroundBehindWindow()) is not supported within a splitter.
            local next_cmd = cmds.Data[1]
            if ImDrawCmd_HeaderCompare(last_cmd, next_cmd) and last_cmd.UserCallback == nil and next_cmd.UserCallback == nil then
                -- Merge previous channel last draw command with current channel first draw command if matching.
                last_cmd.ElemCount = last_cmd.ElemCount + next_cmd.ElemCount
                idx_offset = idx_offset + next_cmd.ElemCount
                cmds:erase(1) -- FIXME-OPT: Improve for multiple merges.
            end
        end
        if cmds.Size > 0 then
            last_cmd = cmds.Data[cmds.Size]
        end
        new_cmd_buffer_count = new_cmd_buffer_count + cmds.Size
        new_idx_buffer_count = new_idx_buffer_count + ch._IdxBuffer.Size
        for cmd_n = 1, cmds.Size do
            cmds.Data[cmd_n].IdxOffset = idx_offset
            idx_offset = idx_offset + cmds.Data[cmd_n].ElemCount
        end
    end
    local cmd_write = draw_list.CmdBuffer.Size + 1
    local idx_write = draw_list.IdxBuffer.Size + 1
    draw_list.CmdBuffer:resize(draw_list.CmdBuffer.Size + new_cmd_buffer_count)
    draw_list.IdxBuffer:resize(draw_list.IdxBuffer.Size + new_idx_buffer_count)

    -- Write commands and indices in order (they are fairly small structures, we don't copy vertices only indices)
    local dst_cmds = draw_list.CmdBuffer.Data
    local dst_idx = draw_list.IdxBuffer.Data
    for i = 2, self._Count do
        local ch = channels[i]
        local src_cmds = ch._CmdBuffer.Data
        for n = 1, ch._CmdBuffer.Size do
            dst_cmds[cmd_write] = src_cmds[n]
            src_cmds[n] = nil -- ownership moved to the draw list
            cmd_write = cmd_write + 1
        end
        local src_idx = ch._IdxBuffer.Data
        for n = 1, ch._IdxBuffer.Size do
            dst_idx[idx_write] = src_idx[n]
            idx_write = idx_write + 1
        end
    end
    draw_list._IdxWritePtr = idx_write

    -- Ensure there's always a non-callback draw command trailing the command-buffer
    if draw_list.CmdBuffer.Size == 0 or draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size].UserCallback ~= nil then
        draw_list:AddDrawCmd()
    end

    -- If current command is used with different settings we need to add a new command
    local curr_cmd = draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size]
    if curr_cmd.ElemCount == 0 then
        ImDrawCmd_HeaderCopyRef(curr_cmd, draw_list._CmdHeader) -- Copy ClipRect, TexRef, VtxOffset
    elseif not ImDrawCmd_HeaderCompare(curr_cmd, draw_list._CmdHeader) then
        draw_list:AddDrawCmd()
    end

    self._Count = 1
end

--- @param draw_list ImDrawList
--- @param idx       int # 0-based channel index
function MT.ImDrawListSplitter:SetCurrentChannel(draw_list, idx)
    IM_ASSERT(idx >= 0 and idx < self._Count)
    if self._Current == idx then
        return
    end

    -- Overwrite ImVector (12/16 bytes), four times. This is merely a silly optimization instead of doing .swap()
    local channels = self._Channels.Data
    local cur = channels[self._Current + 1]
    cur._CmdBuffer = draw_list.CmdBuffer
    cur._IdxBuffer = draw_list.IdxBuffer
    self._Current = idx
    local ch = channels[idx + 1]
    draw_list.CmdBuffer = ch._CmdBuffer
    draw_list.IdxBuffer = ch._IdxBuffer
    draw_list._IdxWritePtr = draw_list.IdxBuffer.Size + 1

    -- If current command is used with different settings we need to add a new command
    local curr_cmd = nil
    if draw_list.CmdBuffer.Size > 0 then curr_cmd = draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size] end
    if curr_cmd == nil then
        draw_list:AddDrawCmd()
    elseif curr_cmd.ElemCount == 0 then
        ImDrawCmd_HeaderCopyRef(curr_cmd, draw_list._CmdHeader) -- Copy ClipRect, TexRef, VtxOffset
    elseif not ImDrawCmd_HeaderCompare(curr_cmd, draw_list._CmdHeader) then
        draw_list:AddDrawCmd()
    end
end

--- @param count int
function MT.ImDrawList:ChannelsSplit(count) self._Splitter:Split(self, count) end
function MT.ImDrawList:ChannelsMerge() self._Splitter:Merge(self) end
--- @param n int # 0-based
function MT.ImDrawList:ChannelsSetCurrent(n) self._Splitter:SetCurrentChannel(self, n) end

--- @param points       ImVec2[]
--- @param points_count int
--- @param col          ImU32
function MT.ImDrawList:AddConvexPolyFilled(points, points_count, col)
    if points_count < 3 or bit32.band(col, IM_COL32_A_MASK) == 0 then
        return
    end

    local uv = self._Data.TexUvWhitePixel

    if bit32.band(self.Flags, ImDrawListFlags.AntiAliasedFill) ~= 0 then
        local AA_SIZE = self._FringeScale
        local col_trans = bit32.band(col, bit32.bnot(IM_COL32_A_MASK))
        local idx_count = (points_count - 2) * 3 + points_count * 6
        local vtx_count = points_count * 2
        self:PrimReserve(idx_count, vtx_count)

        local vtx_inner_idx = self._VtxCurrentIdx
        local vtx_outer_idx = self._VtxCurrentIdx + 1
        local idx_data = self.IdxBuffer.Data
        for i = 2, points_count - 1 do
            local idx_write_ptr = self._IdxWritePtr
            idx_data[idx_write_ptr + 0] = vtx_inner_idx; idx_data[idx_write_ptr + 1] = vtx_inner_idx + ((i - 1) * 2); idx_data[idx_write_ptr + 2] = vtx_inner_idx + (i * 2)
            self._IdxWritePtr = idx_write_ptr + 3
        end

        self._Data.TempBuffer:reserve_discard(points_count)
        local temp_normals = self._Data.TempBuffer.Data

        local i0 = points_count
        for i1 = 1, points_count do
            local p0 = points[i0]
            local p1 = points[i1]
            local dx = p1.x - p0.x
            local dy = p1.y - p0.y
            dx, dy = IM_NORMALIZE2F_OVER_ZERO(dx, dy)
            temp_normals[i0].x = dy
            temp_normals[i0].y = -dx

            i0 = i1
        end

        local vtx_data = self.VtxBuffer.Data
        i0 = points_count
        for i1 = 1, points_count do
            local n0 = temp_normals[i0]
            local n1 = temp_normals[i1]
            local dm_x = (n0.x + n1.x) * 0.5
            local dm_y = (n0.y + n1.y) * 0.5
            dm_x, dm_y = IM_FIXNORMAL2F(dm_x, dm_y)
            dm_x = dm_x * AA_SIZE * 0.5
            dm_y = dm_y * AA_SIZE * 0.5

            local vtx_write_ptr = self._VtxWritePtr
            vtx_data[vtx_write_ptr + 0][1].x = points[i1].x - dm_x; vtx_data[vtx_write_ptr + 0][1].y = points[i1].y - dm_y; ImVec2_Copy(vtx_data[vtx_write_ptr + 0][2], uv); vtx_data[vtx_write_ptr + 0][3] = col
            vtx_data[vtx_write_ptr + 1][1].x = points[i1].x + dm_x; vtx_data[vtx_write_ptr + 1][1].y = points[i1].y + dm_y; ImVec2_Copy(vtx_data[vtx_write_ptr + 1][2], uv); vtx_data[vtx_write_ptr + 1][3] = col_trans
            self._VtxWritePtr = vtx_write_ptr + 2

            local idx_write_ptr = self._IdxWritePtr
            idx_data[idx_write_ptr + 0] = vtx_inner_idx + ((i1 - 1) * 2); idx_data[idx_write_ptr + 1] = vtx_inner_idx + ((i0 - 1) * 2); idx_data[idx_write_ptr + 2] = vtx_outer_idx + ((i0 - 1) * 2)
            idx_data[idx_write_ptr + 3] = vtx_outer_idx + ((i0 - 1) * 2); idx_data[idx_write_ptr + 4] = vtx_outer_idx + ((i1 - 1) * 2); idx_data[idx_write_ptr + 5] = vtx_inner_idx + ((i1 - 1) * 2)
            self._IdxWritePtr = idx_write_ptr + 6

            i0 = i1
        end
        self._VtxCurrentIdx = self._VtxCurrentIdx + vtx_count
    else
        local idx_count = (points_count - 2) * 3
        local vtx_count = points_count
        self:PrimReserve(idx_count, vtx_count)

        local idx_data = self.IdxBuffer.Data; local vtx_data = self.VtxBuffer.Data
        for i = 1, vtx_count do
            local vtx_write_ptr = self._VtxWritePtr
            ImVec2_Copy(vtx_data[vtx_write_ptr + 0][1], points[i]); ImVec2_Copy(vtx_data[vtx_write_ptr + 0][2], uv); vtx_data[vtx_write_ptr + 0][3] = col
            self._VtxWritePtr = vtx_write_ptr + 1
        end
        for i = 3, points_count do
            local idx_write_ptr = self._IdxWritePtr
            idx_data[idx_write_ptr + 0] = self._VtxCurrentIdx; idx_data[idx_write_ptr + 1] = self._VtxCurrentIdx + i - 2; idx_data[idx_write_ptr + 2] = self._VtxCurrentIdx + i - 1
            self._IdxWritePtr = idx_write_ptr + 3
        end

        self._VtxCurrentIdx = self._VtxCurrentIdx + vtx_count
    end
end

function MT.ImDrawList:PushTexture(tex_ref)
    self._TextureStack:push_back(tex_ref)
    self._CmdHeader.TexRef = tex_ref
    if (tex_ref._TexData ~= nil) then
        IM_ASSERT(tex_ref._TexData.WantDestroyNextFrame == false)
    end
    self:_OnChangedTexture()
end

function MT.ImDrawList:PopTexture()
    self._TextureStack:pop_back()
    self._CmdHeader.TexRef = (self._TextureStack.Size == 0) and ImTextureRef() or self._TextureStack.Data[self._TextureStack.Size]
    self:_OnChangedTexture()
end

function MT.ImDrawList:_SetTexture(tex_ref)
    if (self._CmdHeader.TexRef == tex_ref) then
        return
    end
    self._CmdHeader.TexRef = tex_ref
    self._TextureStack.Data[self._TextureStack.Size] = tex_ref
    self:_OnChangedTexture()
end

function MT.ImDrawList:PrimReserve(idx_count, vtx_count)
    IM_ASSERT_PARANOID(idx_count >= 0 and vtx_count >= 0)

    if (self._VtxCurrentIdx + vtx_count >= bit32.lshift(1, 16)) and (bit32.band(self.Flags, ImDrawListFlags.AllowVtxOffset) ~= 0) then
        self._CmdHeader.VtxOffset = self.VtxBuffer.Size + 1
        self:_OnChangedVtxOffset()
    end

    local draw_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
    draw_cmd.ElemCount = draw_cmd.ElemCount + idx_count

    local vtx_buffer_old_size = self.VtxBuffer.Size
    self.VtxBuffer:resize(vtx_buffer_old_size + vtx_count)
    self._VtxWritePtr = vtx_buffer_old_size + 1

    local idx_buffer_old_size = self.IdxBuffer.Size
    self.IdxBuffer:resize(idx_buffer_old_size + idx_count)
    self._IdxWritePtr = idx_buffer_old_size + 1
end

function MT.ImDrawList:PrimUnreserve(idx_count, vtx_count)
    IM_ASSERT_PARANOID(idx_count >= 0 and vtx_count >= 0)

    local draw_cmd = self.CmdBuffer.Data[self.CmdBuffer.Size]
    draw_cmd.ElemCount = draw_cmd.ElemCount - idx_count

    self.VtxBuffer:shrink(self.VtxBuffer.Size - vtx_count)
    self.IdxBuffer:shrink(self.IdxBuffer.Size - idx_count)

    self._VtxWritePtr = self.VtxBuffer.Size + 1
    self._IdxWritePtr = self.IdxBuffer.Size + 1
end

--- @param a   ImVec2
--- @param c   ImVec2
--- @param col ImU32
function MT.ImDrawList:PrimRect(a, c, col)
    local uv = self._Data.TexUvWhitePixel

    local idx = self._VtxCurrentIdx
    local idx_data = self.IdxBuffer.Data; local vtx_data = self.VtxBuffer.Data

    local idx_write_ptr = self._IdxWritePtr
    idx_data[idx_write_ptr + 0] = idx
    idx_data[idx_write_ptr + 1] = idx + 1
    idx_data[idx_write_ptr + 2] = idx + 2

    idx_data[idx_write_ptr + 3] = idx
    idx_data[idx_write_ptr + 4] = idx + 2
    idx_data[idx_write_ptr + 5] = idx + 3

    local vtx_write_ptr = self._VtxWritePtr
    ImVec2_Copy(vtx_data[vtx_write_ptr + 0][1], a)
    ImVec2_Copy(vtx_data[vtx_write_ptr + 0][2], uv)
    vtx_data[vtx_write_ptr + 0][3] = col

    ImVec2_CopyV(vtx_data[vtx_write_ptr + 1][1], c[1], a[2])
    ImVec2_Copy(vtx_data[vtx_write_ptr + 1][2], uv)
    vtx_data[vtx_write_ptr + 1][3] = col

    ImVec2_Copy(vtx_data[vtx_write_ptr + 2][1], c)
    ImVec2_Copy(vtx_data[vtx_write_ptr + 2][2], uv)
    vtx_data[vtx_write_ptr + 2][3] = col

    ImVec2_CopyV(vtx_data[vtx_write_ptr + 3][1], a[1], c[2])
    ImVec2_Copy(vtx_data[vtx_write_ptr + 3][2], uv)
    vtx_data[vtx_write_ptr + 3][3] = col

    self._VtxWritePtr = vtx_write_ptr + 4
    self._VtxCurrentIdx = idx + 4
    self._IdxWritePtr = idx_write_ptr + 6
end

--- @param a    ImVec2
--- @param c    ImVec2
--- @param uv_a ImVec2
--- @param uv_c ImVec2
--- @param col  any
function MT.ImDrawList:PrimRectUV(a, c, uv_a, uv_c, col)
    local idx = self._VtxCurrentIdx
    local idx_data = self.IdxBuffer.Data; local vtx_data = self.VtxBuffer.Data

    local idx_write_ptr = self._IdxWritePtr
    idx_data[idx_write_ptr + 0] = idx
    idx_data[idx_write_ptr + 1] = idx + 1
    idx_data[idx_write_ptr + 2] = idx + 2

    idx_data[idx_write_ptr + 3] = idx
    idx_data[idx_write_ptr + 4] = idx + 2
    idx_data[idx_write_ptr + 5] = idx + 3

    local vtx_write_ptr = self._VtxWritePtr
    ImVec2_Copy(vtx_data[vtx_write_ptr + 0][1], a)
    ImVec2_Copy(vtx_data[vtx_write_ptr + 0][2], uv_a)
    vtx_data[vtx_write_ptr + 0][3] = col

    ImVec2_CopyV(vtx_data[vtx_write_ptr + 1][1], c[1], a[2])
    ImVec2_CopyV(vtx_data[vtx_write_ptr + 1][2], uv_c[1], uv_a[2])
    vtx_data[vtx_write_ptr + 1][3] = col

    ImVec2_Copy(vtx_data[vtx_write_ptr + 2][1], c)
    ImVec2_Copy(vtx_data[vtx_write_ptr + 2][2], uv_c)
    vtx_data[vtx_write_ptr + 2][3] = col

    ImVec2_CopyV(vtx_data[vtx_write_ptr + 3][1], a[1], c[2])
    ImVec2_CopyV(vtx_data[vtx_write_ptr + 3][2], uv_a[1], uv_c[2])
    vtx_data[vtx_write_ptr + 3][3] = col

    self._VtxWritePtr   = vtx_write_ptr + 4
    self._VtxCurrentIdx = idx + 4
    self._IdxWritePtr   = idx_write_ptr + 6
end

--- @param points       ImVec2[]
--- @param points_count int
--- @param col          ImU32
--- @param thickness    float
--- @param flags?       ImDrawFlags
function MT.ImDrawList:AddPolyline(points, points_count, col, thickness, flags)
    if flags == nil then flags = 0 end

    if points_count < 2 or bit32.band(col, IM_COL32_A_MASK) == 0 then
        return
    end

    local closed = bit32.band(flags, ImDrawFlags.Closed) ~= 0
    local opaque_uv = self._Data.TexUvWhitePixel
    local count = closed and points_count or points_count - 1 -- Number of line segments
    local thick_line = thickness > self._FringeScale
    IM_ASSERT_USER_ERROR_RET(bit32.band(flags, ImDrawFlags.InvalidMask_) == 0, "Incorrect parameter. Did you swap 'thickness' and 'flags'?")

    if bit32.band(self.Flags, ImDrawListFlags.AntiAliasedLines) ~= 0 then
        -- Anti-aliased stroke
        local AA_SIZE = self._FringeScale
        local col_trans = bit32.band(col, bit32.bnot(IM_COL32_A_MASK))

        -- Thicknesses <1.0 should behave like thickness 1.0
        thickness = ImMax(thickness, 1.0)
        local integer_thickness = ImFloor(thickness)
        local fractional_thickness = thickness - integer_thickness

        -- Do we want to draw this line using a texture?
        local use_texture = bit32.band(self.Flags, ImDrawListFlags.AntiAliasedLinesUseTex) ~= 0 and integer_thickness < IM_DRAWLIST_TEX_LINES_WIDTH_MAX and fractional_thickness <= 0.00001 and AA_SIZE == 1.0

        IM_ASSERT_PARANOID((not use_texture) or bit32.band(self._Data.Font.OwnerAtlas.Flags, ImFontAtlasFlags.NoBakedLines) == 0)

        local idx_count = use_texture and (count * 6) or (thick_line and count * 18 or count * 12)
        local vtx_count = use_texture and (points_count * 2) or (thick_line and points_count * 4 or points_count * 3)
        self:PrimReserve(idx_count, vtx_count)

        -- Temporary buffer
        local temp_buffer_size = points_count * ((use_texture or not thick_line) and 3 or 5)
        self._Data.TempBuffer:reserve_discard(temp_buffer_size)
        local temp_normals = self._Data.TempBuffer.Data
        local temp_points = self._Data.TempBuffer.Data; local temp_points_start = points_count + 1

        -- Calculate normals for each line segment
        for i1 = 1, count do
            local i2 = (i1 == points_count) and 1 or i1 + 1
            local p1 = points[i1]
            local p2 = points[i2]
            local dx = p2[1] - p1[1]
            local dy = p2[2] - p1[2]
            dx, dy = IM_NORMALIZE2F_OVER_ZERO(dx, dy)
            temp_normals[i1][1] = dy
            temp_normals[i1][2] = -dx
        end
        if not closed then
            ImVec2_Copy(temp_normals[points_count], temp_normals[points_count - 1])
        end

        -- If we are drawing a one-pixel-wide line without a texture, or a textured line of any width
        if use_texture or not thick_line then
            -- [PATH 1] Texture-based lines (thick or non-thick)
            -- [PATH 2] Non texture-based lines (non-thick)
            local half_draw_size = use_texture and (thickness * 0.5 + 1) or AA_SIZE

            -- If line is not closed, the first and last points need to be generated differently
            if not closed then
                ImVec2_CopyV(temp_points[temp_points_start + 0], ImVec2_AddVA(points[1], ImVec2_MulVX(temp_normals[1], half_draw_size)))
                ImVec2_CopyV(temp_points[temp_points_start + 1], ImVec2_SubVA(points[1], ImVec2_MulVX(temp_normals[1], half_draw_size)))
                ImVec2_CopyV(temp_points[temp_points_start + (points_count - 1) * 2 + 0], ImVec2_AddVA(points[points_count], ImVec2_MulVX(temp_normals[points_count], half_draw_size)))
                ImVec2_CopyV(temp_points[temp_points_start + (points_count - 1) * 2 + 1], ImVec2_SubVA(points[points_count], ImVec2_MulVX(temp_normals[points_count], half_draw_size)))
            end

            -- Generate indices and vertices
            local idx1 = self._VtxCurrentIdx
            local idx_data = self.IdxBuffer.Data; local vtx_data = self.VtxBuffer.Data
            for i1 = 1, count do
                local i2 = (i1 == points_count) and 1 or i1 + 1
                local idx2 = (i1 == points_count) and self._VtxCurrentIdx or (idx1 + (use_texture and 2 or 3))

                -- Average normals
                local dm_x = (temp_normals[i1][1] + temp_normals[i2][1]) * 0.5
                local dm_y = (temp_normals[i1][2] + temp_normals[i2][2]) * 0.5
                dm_x, dm_y = IM_FIXNORMAL2F(dm_x, dm_y)
                dm_x = dm_x * half_draw_size
                dm_y = dm_y * half_draw_size

                -- Add temporary vertices for the outer edges
                local out_off = (i2 - 1) * 2
                temp_points[temp_points_start + out_off + 0][1] = points[i2][1] + dm_x
                temp_points[temp_points_start + out_off + 0][2] = points[i2][2] + dm_y
                temp_points[temp_points_start + out_off + 1][1] = points[i2][1] - dm_x
                temp_points[temp_points_start + out_off + 1][2] = points[i2][2] - dm_y

                if use_texture then
                    -- Add indices for two triangles
                    local idx_write_ptr = self._IdxWritePtr
                    idx_data[idx_write_ptr + 0] = idx2 + 0; idx_data[idx_write_ptr + 1] = idx1 + 0; idx_data[idx_write_ptr + 2] = idx1 + 1
                    idx_data[idx_write_ptr + 3] = idx2 + 1; idx_data[idx_write_ptr + 4] = idx1 + 1; idx_data[idx_write_ptr + 5] = idx2 + 0
                    self._IdxWritePtr = idx_write_ptr + 6
                else
                    -- Add indices for four triangles
                    local idx_write_ptr = self._IdxWritePtr
                    idx_data[idx_write_ptr + 0] = idx2 + 0; idx_data[idx_write_ptr + 1] = idx1 + 0; idx_data[idx_write_ptr + 2] = idx1 + 2
                    idx_data[idx_write_ptr + 3] = idx1 + 2; idx_data[idx_write_ptr + 4] = idx2 + 2; idx_data[idx_write_ptr + 5] = idx2 + 0
                    idx_data[idx_write_ptr + 6] = idx2 + 1; idx_data[idx_write_ptr + 7] = idx1 + 1; idx_data[idx_write_ptr + 8] = idx1 + 0
                    idx_data[idx_write_ptr + 9] = idx1 + 0; idx_data[idx_write_ptr + 10] = idx2 + 0; idx_data[idx_write_ptr + 11] = idx2 + 1
                    self._IdxWritePtr = idx_write_ptr + 12
                end

                idx1 = idx2
            end

            -- Add vertices
            if use_texture then
                -- Texture-based: need to implement TexUvLines lookup
                local tex_uvs = self._Data.TexUvLines[integer_thickness]
                local tex_uv0 = ImVec2(tex_uvs.x, tex_uvs.y)
                local tex_uv1 = ImVec2(tex_uvs.z, tex_uvs.w)
                for i = 0, points_count - 1 do
                    local vtx_write_ptr = self._VtxWritePtr
                    ImVec2_Copy(vtx_data[vtx_write_ptr + 0][1], temp_points[temp_points_start + i * 2 + 0]); ImVec2_Copy(vtx_data[vtx_write_ptr + 0][2], tex_uv0); vtx_data[vtx_write_ptr + 0][3] = col
                    ImVec2_Copy(vtx_data[vtx_write_ptr + 1][1], temp_points[temp_points_start + i * 2 + 1]); ImVec2_Copy(vtx_data[vtx_write_ptr + 1][2], tex_uv1); vtx_data[vtx_write_ptr + 1][3] = col
                    self._VtxWritePtr = vtx_write_ptr + 2
                end
            else
                -- If we're not using a texture, we need the center vertex as well
                for i = 0, points_count - 1 do
                    local vtx_write_ptr = self._VtxWritePtr
                    ImVec2_Copy(vtx_data[vtx_write_ptr + 0][1], points[i + 1]);                              ImVec2_Copy(vtx_data[vtx_write_ptr + 0][2], opaque_uv); vtx_data[vtx_write_ptr + 0][3] = col
                    ImVec2_Copy(vtx_data[vtx_write_ptr + 1][1], temp_points[temp_points_start + i * 2 + 0]); ImVec2_Copy(vtx_data[vtx_write_ptr + 1][2], opaque_uv); vtx_data[vtx_write_ptr + 1][3] = col_trans
                    ImVec2_Copy(vtx_data[vtx_write_ptr + 2][1], temp_points[temp_points_start + i * 2 + 1]); ImVec2_Copy(vtx_data[vtx_write_ptr + 2][2], opaque_uv); vtx_data[vtx_write_ptr + 2][3] = col_trans
                    self._VtxWritePtr = vtx_write_ptr + 3
                end
            end
        else
            -- [PATH 3] Non texture-based lines (thick)
            local half_inner_thickness = (thickness - AA_SIZE) * 0.5

            -- If line is not closed, handle first and last points
            if not closed then
                local points_last = points_count - 1
                ImVec2_CopyV(temp_points[temp_points_start + 0], ImVec2_AddVA(points[1], ImVec2_MulVX(temp_normals[1], (half_inner_thickness + AA_SIZE))))
                ImVec2_CopyV(temp_points[temp_points_start + 1], ImVec2_AddVA(points[1], ImVec2_MulVX(temp_normals[1], half_inner_thickness)))
                ImVec2_CopyV(temp_points[temp_points_start + 2], ImVec2_SubVA(points[1], ImVec2_MulVX(temp_normals[1], half_inner_thickness)))
                ImVec2_CopyV(temp_points[temp_points_start + 3], ImVec2_SubVA(points[1], ImVec2_MulVX(temp_normals[1], (half_inner_thickness + AA_SIZE))))
                ImVec2_CopyV(temp_points[temp_points_start + points_last * 4 + 0], ImVec2_AddVA(points[points_count], ImVec2_MulVX(temp_normals[points_last + 1], (half_inner_thickness + AA_SIZE))))
                ImVec2_CopyV(temp_points[temp_points_start + points_last * 4 + 1], ImVec2_AddVA(points[points_count], ImVec2_MulVX(temp_normals[points_last + 1], half_inner_thickness)))
                ImVec2_CopyV(temp_points[temp_points_start + points_last * 4 + 2], ImVec2_SubVA(points[points_count], ImVec2_MulVX(temp_normals[points_last + 1], half_inner_thickness)))
                ImVec2_CopyV(temp_points[temp_points_start + points_last * 4 + 3], ImVec2_SubVA(points[points_count], ImVec2_MulVX(temp_normals[points_last + 1], (half_inner_thickness + AA_SIZE))))
            end

            -- Generate indices and vertices
            local idx1 = self._VtxCurrentIdx
            local idx_data = self.IdxBuffer.Data; local vtx_data = self.VtxBuffer.Data
            for i1 = 1, count do
                local i2 = (i1 == points_count) and 1 or i1 + 1
                local idx2 = (i1 == points_count) and self._VtxCurrentIdx or (idx1 + 4)

                -- Average normals
                local dm_x = (temp_normals[i1][1] + temp_normals[i2][1]) * 0.5
                local dm_y = (temp_normals[i1][2] + temp_normals[i2][2]) * 0.5
                dm_x, dm_y = IM_FIXNORMAL2F(dm_x, dm_y)
                local dm_out_x = dm_x * (half_inner_thickness + AA_SIZE)
                local dm_out_y = dm_y * (half_inner_thickness + AA_SIZE)
                local dm_in_x = dm_x * half_inner_thickness
                local dm_in_y = dm_y * half_inner_thickness

                -- Add temporary vertices
                local out_off = (i2 - 1) * 4
                temp_points[temp_points_start + out_off + 0][1] = points[i2][1] + dm_out_x
                temp_points[temp_points_start + out_off + 0][2] = points[i2][2] + dm_out_y
                temp_points[temp_points_start + out_off + 1][1] = points[i2][1] + dm_in_x
                temp_points[temp_points_start + out_off + 1][2] = points[i2][2] + dm_in_y
                temp_points[temp_points_start + out_off + 2][1] = points[i2][1] - dm_in_x
                temp_points[temp_points_start + out_off + 2][2] = points[i2][2] - dm_in_y
                temp_points[temp_points_start + out_off + 3][1] = points[i2][1] - dm_out_x
                temp_points[temp_points_start + out_off + 3][2] = points[i2][2] - dm_out_y

                -- Add indices
                local idx_write_ptr = self._IdxWritePtr
                idx_data[idx_write_ptr + 0] = idx2 + 1; idx_data[idx_write_ptr + 1] = idx1 + 1; idx_data[idx_write_ptr + 2] = idx1 + 2
                idx_data[idx_write_ptr + 3] = idx1 + 2; idx_data[idx_write_ptr + 4] = idx2 + 2; idx_data[idx_write_ptr + 5] = idx2 + 1
                idx_data[idx_write_ptr + 6] = idx2 + 1; idx_data[idx_write_ptr + 7] = idx1 + 1; idx_data[idx_write_ptr + 8] = idx1 + 0
                idx_data[idx_write_ptr + 9] = idx1 + 0; idx_data[idx_write_ptr + 10] = idx2 + 0; idx_data[idx_write_ptr + 11] = idx2 + 1
                idx_data[idx_write_ptr + 12] = idx2 + 2; idx_data[idx_write_ptr + 13] = idx1 + 2; idx_data[idx_write_ptr + 14] = idx1 + 3
                idx_data[idx_write_ptr + 15] = idx1 + 3; idx_data[idx_write_ptr + 16] = idx2 + 3; idx_data[idx_write_ptr + 17] = idx2 + 2
                self._IdxWritePtr = idx_write_ptr + 18

                idx1 = idx2
            end

            -- Add vertices
            for i = 0, points_count - 1 do
                local vtx_write_ptr = self._VtxWritePtr
                ImVec2_Copy(vtx_data[vtx_write_ptr + 0][1], temp_points[temp_points_start + i * 4 + 0]); ImVec2_Copy(vtx_data[vtx_write_ptr + 0][2], opaque_uv); vtx_data[vtx_write_ptr + 0][3] = col_trans
                ImVec2_Copy(vtx_data[vtx_write_ptr + 1][1], temp_points[temp_points_start + i * 4 + 1]); ImVec2_Copy(vtx_data[vtx_write_ptr + 1][2], opaque_uv); vtx_data[vtx_write_ptr + 1][3] = col
                ImVec2_Copy(vtx_data[vtx_write_ptr + 2][1], temp_points[temp_points_start + i * 4 + 2]); ImVec2_Copy(vtx_data[vtx_write_ptr + 2][2], opaque_uv); vtx_data[vtx_write_ptr + 2][3] = col
                ImVec2_Copy(vtx_data[vtx_write_ptr + 3][1], temp_points[temp_points_start + i * 4 + 3]); ImVec2_Copy(vtx_data[vtx_write_ptr + 3][2], opaque_uv); vtx_data[vtx_write_ptr + 3][3] = col_trans
                self._VtxWritePtr = vtx_write_ptr + 4
            end
        end
        self._VtxCurrentIdx = self._VtxCurrentIdx + vtx_count
    else
        -- [PATH 4] Non texture-based, Non anti-aliased lines
        local idx_count = count * 6
        local vtx_count = count * 4
        self:PrimReserve(idx_count, vtx_count)

        local idx_data = self.IdxBuffer.Data; local vtx_data = self.VtxBuffer.Data
        for i1 = 1, count do
            local i2 = (i1 == points_count) and 1 or i1 + 1
            local p1 = points[i1]
            local p2 = points[i2]

            local dx = p2[1] - p1[1]
            local dy = p2[2] - p1[2]
            dx, dy = IM_NORMALIZE2F_OVER_ZERO(dx, dy)
            dx = dx * (thickness * 0.5)
            dy = dy * (thickness * 0.5)

            local vtx_write_ptr = self._VtxWritePtr
            vtx_data[vtx_write_ptr + 0][1][1] = p1[1] + dy; vtx_data[vtx_write_ptr + 0][1][2] = p1[2] - dx; ImVec2_Copy(vtx_data[vtx_write_ptr + 0][2], opaque_uv); vtx_data[vtx_write_ptr + 0][3] = col
            vtx_data[vtx_write_ptr + 1][1][1] = p2[1] + dy; vtx_data[vtx_write_ptr + 1][1][2] = p2[2] - dx; ImVec2_Copy(vtx_data[vtx_write_ptr + 1][2], opaque_uv); vtx_data[vtx_write_ptr + 1][3] = col
            vtx_data[vtx_write_ptr + 2][1][1] = p2[1] - dy; vtx_data[vtx_write_ptr + 2][1][2] = p2[2] + dx; ImVec2_Copy(vtx_data[vtx_write_ptr + 2][2], opaque_uv); vtx_data[vtx_write_ptr + 2][3] = col
            vtx_data[vtx_write_ptr + 3][1][1] = p1[1] - dy; vtx_data[vtx_write_ptr + 3][1][2] = p1[2] + dx; ImVec2_Copy(vtx_data[vtx_write_ptr + 3][2], opaque_uv); vtx_data[vtx_write_ptr + 3][3] = col
            self._VtxWritePtr = vtx_write_ptr + 4

            local idx_write_ptr = self._IdxWritePtr
            idx_data[idx_write_ptr + 0] = self._VtxCurrentIdx + 0; idx_data[idx_write_ptr + 1] = self._VtxCurrentIdx + 1; idx_data[idx_write_ptr + 2] = self._VtxCurrentIdx + 2
            idx_data[idx_write_ptr + 3] = self._VtxCurrentIdx + 0; idx_data[idx_write_ptr + 4] = self._VtxCurrentIdx + 2; idx_data[idx_write_ptr + 5] = self._VtxCurrentIdx + 3
            self._IdxWritePtr = idx_write_ptr + 6
            self._VtxCurrentIdx = self._VtxCurrentIdx + 4
        end
    end
end

function MT.ImDrawList:PathRect(a, b, rounding, flags)
    if not rounding then rounding = 0.0 end
    if not flags    then flags    = 0   end

    if rounding >= 0.5 then
        IM_ASSERT(bit32.band(flags, 0x0F) == 0, "Misuse of legacy hardcoded ImDrawCornerFlags values!")
        if bit32.band(flags, ImDrawFlags.RoundCornersMask_) == 0 then
            flags = bit32.bor(flags, ImDrawFlags.RoundCornersAll)
        end
        rounding = ImMin(rounding, ImAbs(b.x - a.x) * (((bit32.band(flags, ImDrawFlags.RoundCornersTop) == ImDrawFlags.RoundCornersTop) or (bit32.band(flags, ImDrawFlags.RoundCornersBottom) == ImDrawFlags.RoundCornersBottom)) and 0.5 or 1.0) - 1.0)
        rounding = ImMin(rounding, ImAbs(b.y - a.y) * (((bit32.band(flags, ImDrawFlags.RoundCornersLeft) == ImDrawFlags.RoundCornersLeft) or (bit32.band(flags, ImDrawFlags.RoundCornersRight) == ImDrawFlags.RoundCornersRight)) and 0.5 or 1.0) - 1.0)
    end
    if rounding < 0.5 or (bit32.band(flags, ImDrawFlags.RoundCornersMask_) == ImDrawFlags.RoundCornersNone) then
        self:PathLineTo(a)
        self:PathLineTo(ImVec2(b.x, a.y))
        self:PathLineTo(b)
        self:PathLineTo(ImVec2(a.x, b.y))
    else
        local rounding_tl = (bit32.band(flags, ImDrawFlags.RoundCornersTopLeft) ~= 0) and rounding or 0.0
        local rounding_tr = (bit32.band(flags, ImDrawFlags.RoundCornersTopRight) ~= 0) and rounding or 0.0
        local rounding_br = (bit32.band(flags, ImDrawFlags.RoundCornersBottomRight) ~= 0) and rounding or 0.0
        local rounding_bl = (bit32.band(flags, ImDrawFlags.RoundCornersBottomLeft) ~= 0) and rounding or 0.0
        self:PathArcToFast(ImVec2(a.x + rounding_tl, a.y + rounding_tl), rounding_tl, 6, 9)
        self:PathArcToFast(ImVec2(b.x - rounding_tr, a.y + rounding_tr), rounding_tr, 9, 12)
        self:PathArcToFast(ImVec2(b.x - rounding_br, b.y - rounding_br), rounding_br, 0, 3)
        self:PathArcToFast(ImVec2(a.x + rounding_bl, b.y - rounding_bl), rounding_bl, 3, 6)
    end
end

function MT.ImDrawList:AddRectFilled(p_min, p_max, col, rounding, flags)
    if not rounding then rounding = 0.0 end
    if not flags    then flags    = 0   end

    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end

    if rounding < 0.5 or (bit32.band(flags, ImDrawFlags.RoundCornersMask_) == ImDrawFlags.RoundCornersNone) then
        self:PrimReserve(6, 4)
        self:PrimRect(p_min, p_max, col)
    else
        self:PathRect(p_min, p_max, rounding, flags)
        self:PathFillConvex(col)
    end
end

--- @param p_min         ImVec2
--- @param p_max         ImVec2
--- @param col_upr_left  ImU32
--- @param col_upr_right ImU32
--- @param col_bot_right ImU32
--- @param col_bot_left  ImU32
function MT.ImDrawList:AddRectFilledMultiColor(p_min, p_max, col_upr_left, col_upr_right, col_bot_right, col_bot_left)
    if bit32.band(bit32.bor(col_upr_left, col_upr_right, col_bot_right, col_bot_left), IM_COL32_A_MASK) == 0 then
        return
    end

    local uv = self._Data.TexUvWhitePixel
    self:PrimReserve(6, 4)
    self:PrimWriteIdx(self._VtxCurrentIdx); self:PrimWriteIdx(self._VtxCurrentIdx + 1); self:PrimWriteIdx(self._VtxCurrentIdx + 2)
    self:PrimWriteIdx(self._VtxCurrentIdx); self:PrimWriteIdx(self._VtxCurrentIdx + 2); self:PrimWriteIdx(self._VtxCurrentIdx + 3)
    self:PrimWriteVtx(p_min, uv, col_upr_left)
    self:PrimWriteVtx(ImVec2(p_max.x, p_min.y), uv, col_upr_right)
    self:PrimWriteVtx(p_max, uv, col_bot_right)
    self:PrimWriteVtx(ImVec2(p_min.x, p_max.y), uv, col_bot_left)
end

--- @param p_min      ImVec2
--- @param p_max      ImVec2
--- @param col        ImU32
--- @param rounding   float
--- @param thickness? float
--- @param flags?     ImDrawFlags
function MT.ImDrawList:AddRect(p_min, p_max, col, rounding, thickness, flags)
    if thickness == nil then thickness = 1.0 end
    if flags     == nil then flags     = 0   end

    IM_ASSERT_USER_ERROR_RET(bit32.band(flags, ImDrawFlags.InvalidMask_) == 0, "Incorrect parameter. Did you swap 'thickness' and 'flags'?")

    if bit32.band(col, IM_COL32_A_MASK) == 0 then
        return
    end
    if bit32.band(self.Flags, ImDrawListFlags.AntiAliasedLines) ~= 0 then
        self:PathRect(p_min + ImVec2(0.50, 0.50), p_max - ImVec2(0.50, 0.50), rounding, flags)
    else
        self:PathRect(p_min + ImVec2(0.50, 0.50), p_max - ImVec2(0.49, 0.49), rounding, flags)
    end

    self:PathStroke(col, thickness, ImDrawFlags.Closed)
end

function MT.ImDrawList:AddLine(p1, p2, col, thickness)
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end

    self:PathLineTo(p1 + ImVec2(0.5, 0.5))
    self:PathLineTo(p2 + ImVec2(0.5, 0.5))
    self:PathStroke(col, thickness)
end

--- @param min_x      float
--- @param max_x      float
--- @param y          float
--- @param col        ImU32
--- @param thickness? float
function MT.ImDrawList:AddLineH(min_x, max_x, y, col, thickness)
    if thickness == nil then thickness = 1.0 end

    if bit32.band(col, IM_COL32_A_MASK) == 0 then
        return
    end
    self:PathLineTo(ImVec2(min_x + 0.5, y + 0.5))
    self:PathLineTo(ImVec2(max_x + 0.5, y + 0.5))
    self:PathStroke(col, thickness)
end

--- @param x          float
--- @param min_y      float
--- @param max_y      float
--- @param col        ImU32
--- @param thickness? float
function MT.ImDrawList:AddLineV(x, min_y, max_y, col, thickness)
    if thickness == nil then thickness = 1.0 end

    if bit32.band(col, IM_COL32_A_MASK) == 0 then
        return
    end
    self:PathLineTo(ImVec2(x + 0.5, min_y + 0.5))
    self:PathLineTo(ImVec2(x + 0.5, max_y + 0.5))
    self:PathStroke(col, thickness)
end

function MT.ImDrawList:AddTriangle(p1, p2, p3, col, thickness)
    if bit32.band(col, IM_COL32_A_MASK) == 0 then
        return
    end

    self:PathLineTo(p1)
    self:PathLineTo(p2)
    self:PathLineTo(p3)
    self:PathStroke(col, thickness, ImDrawFlags.Closed)
end

function MT.ImDrawList:AddQuad(p1, p2, p3, p4, col, thickness)
    if thickness == nil then thickness = 1.0 end
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end

    self:PathLineTo(p1)
    self:PathLineTo(p2)
    self:PathLineTo(p3)
    self:PathLineTo(p4)
    self:PathStroke(col, thickness, ImDrawFlags.Closed)
end

function MT.ImDrawList:AddQuadFilled(p1, p2, p3, p4, col)
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end

    self:PathLineTo(p1)
    self:PathLineTo(p2)
    self:PathLineTo(p3)
    self:PathLineTo(p4)
    self:PathFillConvex(col)
end

function MT.ImDrawList:AddTriangleFilled(p1, p2, p3, col)
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end

    self:PathLineTo(p1)
    self:PathLineTo(p2)
    self:PathLineTo(p3)
    self:PathFillConvex(col)
end

--- @param center       ImVec2
--- @param radius       float
--- @param col          ImU32
--- @param num_segments int
--- @param thickness    float
function MT.ImDrawList:AddCircle(center, radius, col, num_segments, thickness)
    if num_segments == nil then num_segments = 0   end
    if thickness    == nil then thickness    = 1.0 end

    if bit32.band(col, IM_COL32_A_MASK) == 0 or radius < 0.5 then
        return
    end

    if num_segments <= 0 then
        -- Use arc with automatic segment count
        self:_PathArcToFastEx(center, radius - 0.5, 0, IM_DRAWLIST_ARCFAST_SAMPLE_MAX, 0)
        self._Path.Size = self._Path.Size - 1
    else
        -- Explicit segment count (still clamp to avoid drawing insanely tessellated shapes)
        num_segments = ImClamp(num_segments, 3, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX)

        -- Because we are filling a closed shape we remove 1 from the count of segments/points
        local a_max = (IM_PI * 2.0) * (num_segments - 1) / num_segments
        self:PathArcTo(center, radius - 0.5, 0.0, a_max, num_segments - 1)
    end

    self:PathStroke(col, thickness, ImDrawFlags.Closed)
end

--- @param center       ImVec2
--- @param radius       float
--- @param col          ImU32
--- @param num_segments int
function MT.ImDrawList:AddCircleFilled(center, radius, col, num_segments)
    if num_segments == nil then num_segments = 0 end

    if bit32.band(col, IM_COL32_A_MASK) == 0 or radius < 0.5 then
        return
    end

    if num_segments <= 0 then
        -- Use arc with automatic segment count
        self:_PathArcToFastEx(center, radius, 0, IM_DRAWLIST_ARCFAST_SAMPLE_MAX, 0)
        self._Path.Size = self._Path.Size - 1
    else
        -- Explicit segment count (still clamp to avoid drawing insanely tessellated shapes)
        num_segments = ImClamp(num_segments, 3, IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_MAX)

        -- Because we are filling a closed shape we remove 1 from the count of segments/points
        local a_max = (IM_PI * 2.0) * (num_segments - 1) / num_segments
        self:PathArcTo(center, radius, 0.0, a_max, num_segments - 1)
    end

    self:PathFillConvex(col)
end

--- @param font                ImFont
--- @param font_size           float
--- @param pos                 ImVec2
--- @param col                 ImU32
--- @param text                string
--- @param text_begin?         int    # Defaults to 1
--- @param text_end            int
--- @param wrap_width          float
--- @param cpu_fine_clip_rect? ImVec4
function MT.ImDrawList:AddText(font, font_size, pos, col, text, text_begin, text_end, wrap_width, cpu_fine_clip_rect)
    -- Overload: AddText(pos, col, text, text_end?)
    if type(font) == "table" and type(font[1]) == "number" then
        font, font_size, pos, col, text, text_begin, text_end, wrap_width, cpu_fine_clip_rect = nil, 0.0, font, font_size, pos, 1, col, 0.0, nil
        if text_end == nil then text_end = #text + 1 end
    end
    if text_begin == nil then text_begin = 1 end

    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end

    if text_begin == text_end then
        return
    end

    if font == nil then
        font = self._Data.Font
    end
    if font_size == 0.0 then
        font_size = self._Data.FontSize
    end

    local clip_rect = ImVec4() -- Don't modify the clip rect!
    ImVec4_Copy(clip_rect, self._CmdHeader.ClipRect)
    if (cpu_fine_clip_rect) then
        clip_rect.x = ImMax(clip_rect.x, cpu_fine_clip_rect.x)
        clip_rect.y = ImMax(clip_rect.y, cpu_fine_clip_rect.y)
        clip_rect.z = ImMin(clip_rect.z, cpu_fine_clip_rect.z)
        clip_rect.w = ImMin(clip_rect.w, cpu_fine_clip_rect.w)
    end

    font:RenderText(self, font_size, pos, col, clip_rect, text, text_begin, text_end, wrap_width, (cpu_fine_clip_rect ~= nil) and ImDrawTextFlags.CpuFineClip or ImDrawTextFlags.None)
end

--- @param tex_ref ImTextureRef
--- @param p_min   ImVec2
--- @param p_max   ImVec2
--- @param uv_min? ImVec2
--- @param uv_max? ImVec2
--- @param col?    ImU32
function MT.ImDrawList:AddImage(tex_ref, p_min, p_max, uv_min, uv_max, col)
    if uv_min == nil then uv_min = ImVec2(0, 0)   end
    if uv_max == nil then uv_max = ImVec2(1, 1)   end
    if col    == nil then col    = IM_COL32_WHITE end

    if bit32.band(col, IM_COL32_A_MASK) == 0 then
        return
    end

    local push_texture_id = tex_ref ~= self._CmdHeader.TexRef
    if push_texture_id then
        self:PushTexture(tex_ref)
    end

    self:PrimReserve(6, 4)
    self:PrimRectUV(p_min, p_max, uv_min, uv_max, col)

    if push_texture_id then
        self:PopTexture()
    end
end

--- @param tex_ref  ImTextureRef
--- @param p_min    ImVec2
--- @param p_max    ImVec2
--- @param uv_min   ImVec2
--- @param uv_max   ImVec2
--- @param col      ImU32
--- @param rounding float
--- @param flags    ImDrawFlags
function MT.ImDrawList:AddImageRounded(tex_ref, p_min, p_max, uv_min, uv_max, col, rounding, flags)
    if bit32.band(col, IM_COL32_A_MASK) == 0 then
        return
    end

    IM_ASSERT(bit32.band(flags, 0x0F) == 0, "Misuse of legacy hardcoded ImDrawCornerFlags values!")
    if bit32.band(flags, ImDrawFlags.RoundCornersMask_) == 0 then
        flags = bit32.bor(flags, ImDrawFlags.RoundCornersAll)
    end

    if rounding < 0.5 or bit32.band(flags, ImDrawFlags.RoundCornersMask_) == ImDrawFlags.RoundCornersNone then
        self:AddImage(tex_ref, p_min, p_max, uv_min, uv_max, col)
        return
    end

    local push_texture_id = (tex_ref ~= self._CmdHeader.TexRef)
    if push_texture_id then
        self:PushTexture(tex_ref)
    end

    local vert_start_idx = self.VtxBuffer.Size + 1
    self:PathRect(p_min, p_max, rounding, flags)
    self:PathFillConvex(col)
    local vert_end_idx = self.VtxBuffer.Size + 1
    ImGui.ShadeVertsLinearUV(self, vert_start_idx, vert_end_idx, p_min, p_max, uv_min, uv_max, true)

    if push_texture_id then
        self:PopTexture()
    end
end

--- @param radius float
function MT.ImDrawList:_CalcCircleAutoSegmentCount(radius)
    local radius_idx = ImFloor(radius + 0.999) + 1

    if radius_idx >= 1 and radius_idx <= 64 then -- IM_COUNTOF(_Data->CircleSegmentCounts)
        return self._Data.CircleSegmentCounts[radius_idx]
    else
        return IM_DRAWLIST_CIRCLE_AUTO_SEGMENT_CALC(radius, self._Data.CircleTessellationMaxError)
    end
end

function MT.ImDrawList:PushClipRect(cr_min, cr_max, intersect_with_current_clip_rect)
    local cr = ImVec4(cr_min.x, cr_min.y, cr_max.x, cr_max.y)

    if intersect_with_current_clip_rect then
        local current = self._CmdHeader.ClipRect

        if cr.x < current.x then cr.x = current.x end
        if cr.y < current.y then cr.y = current.y end
        if cr.z > current.z then cr.z = current.z end
        if cr.w > current.w then cr.w = current.w end
    end

    cr.z = ImMax(cr.x, cr.z)
    cr.w = ImMax(cr.y, cr.w)

    self._ClipRectStack:push_back(cr)
    ImVec4_Copy(self._CmdHeader.ClipRect, cr)
    self:_OnChangedClipRect()
end

function MT.ImDrawList:PopClipRect()
    self._ClipRectStack:pop_back()
    if (self._ClipRectStack.Size == 0) then -- LUA: No "Ternary Operator"
        ImVec4_Copy(self._CmdHeader.ClipRect, self._Data.ClipRectFullscreen)
    else
        ImVec4_Copy(self._CmdHeader.ClipRect, self._ClipRectStack.Data[self._ClipRectStack.Size])
    end
    self:_OnChangedClipRect()
end

--- @param center       ImVec2
--- @param radius       float
--- @param a_min_sample int
--- @param a_max_sample int
--- @param a_step       int
function MT.ImDrawList:_PathArcToFastEx(center, radius, a_min_sample, a_max_sample, a_step)
    if radius < 0.5 then
        self._Path:push_back(center)
        return
    end

    if a_step <= 0 then
        a_step = math.floor(IM_DRAWLIST_ARCFAST_SAMPLE_MAX / self:_CalcCircleAutoSegmentCount(radius))
    end

    a_step = ImClamp(a_step, 1, math.floor(IM_DRAWLIST_ARCFAST_TABLE_SIZE / 4))

    local sample_range = ImAbs(a_max_sample - a_min_sample)
    local a_next_step = a_step

    local samples = sample_range + 1
    local extra_max_sample = false
    if a_step > 1 then
        samples = math.floor(sample_range / a_step) + 1
        local overstep = sample_range % a_step

        if overstep > 0 then
            extra_max_sample = true
            samples = samples + 1

            if sample_range > 0 then
                a_step = a_step - math.floor((a_step - overstep) / 2)
            end
        end
    end

    self._Path:resize(self._Path.Size + samples)
    local out_ptr = self._Path.Size - samples + 1

    local sample_index = a_min_sample
    if sample_index < 0 or sample_index >= IM_DRAWLIST_ARCFAST_SAMPLE_MAX then
        sample_index = sample_index % IM_DRAWLIST_ARCFAST_SAMPLE_MAX
        if sample_index < 0 then
            sample_index = sample_index + IM_DRAWLIST_ARCFAST_SAMPLE_MAX
        end
    end

    if a_max_sample >= a_min_sample then
        local a = a_min_sample
        while a <= a_max_sample do
            if sample_index >= IM_DRAWLIST_ARCFAST_SAMPLE_MAX then
                sample_index = sample_index - IM_DRAWLIST_ARCFAST_SAMPLE_MAX
            end

            local s = self._Data.ArcFastVtx[sample_index + 1]
            ImVec2_CopyV(self._Path.Data[out_ptr], center.x + s.x * radius, center.y + s.y * radius)
            out_ptr = out_ptr + 1

            a = a + a_step
            sample_index = sample_index + a_step
            a_step = a_next_step
        end
    else
        local a = a_min_sample
        while a >= a_max_sample do
            if sample_index < 0 then
                sample_index = sample_index + IM_DRAWLIST_ARCFAST_SAMPLE_MAX
            end

            local s = self._Data.ArcFastVtx[sample_index + 1]
            ImVec2_CopyV(self._Path.Data[out_ptr], center.x + s.x * radius, center.y + s.y * radius)
            out_ptr = out_ptr + 1

            a = a - a_step
            sample_index = sample_index - a_step
            a_step = a_next_step
        end
    end

    if extra_max_sample then
        local normalized_max_sample = a_max_sample % IM_DRAWLIST_ARCFAST_SAMPLE_MAX
        if normalized_max_sample < 0 then
            normalized_max_sample = normalized_max_sample + IM_DRAWLIST_ARCFAST_SAMPLE_MAX
        end

        local s = self._Data.ArcFastVtx[normalized_max_sample + 1]
        ImVec2_CopyV(self._Path.Data[out_ptr], center.x + s.x * radius, center.y + s.y * radius)
        out_ptr = out_ptr + 1
    end

    IM_ASSERT_PARANOID(self._Path.Size == out_ptr - 1)
end

function MT.ImDrawList:PathArcToFast(center, radius, a_min_of_12, a_max_of_12)
    if radius < 0.5 then
        self._Path:push_back(center)
        return
    end

    self:_PathArcToFastEx(center, radius, a_min_of_12 * IM_DRAWLIST_ARCFAST_SAMPLE_MAX / 12, a_max_of_12 * IM_DRAWLIST_ARCFAST_SAMPLE_MAX / 12, 0)
end

--- @param center       ImVec2
--- @param radius       float
--- @param a_min        float
--- @param a_max        float
--- @param num_segments int
function MT.ImDrawList:_PathArcToN(center, radius, a_min, a_max, num_segments)
    if radius < 0.5 then
        self._Path:push_back(center)
        return
    end

    -- Note that we are adding a point at both a_min and a_max.
    -- If you are trying to draw a full closed circle you don't want the overlapping points!
    self._Path:reserve(self._Path.Size + (num_segments + 1))
    for i = 0, num_segments do
        local a = a_min + (i / num_segments) * (a_max - a_min)
        self._Path:push_back(ImVec2(center.x + ImCos(a) * radius, center.y + ImSin(a) * radius))
    end
end

--- @param center        ImVec2
--- @param radius        float
--- @param a_min         float
--- @param a_max         float
--- @param num_segments? int
function MT.ImDrawList:PathArcTo(center, radius, a_min, a_max, num_segments)
    if num_segments == nil then num_segments = 0 end

    if radius < 0.5 then
        self._Path:push_back(center)
        return
    end

    if num_segments > 0 then
        self:_PathArcToN(center, radius, a_min, a_max, num_segments)
        return
    end

    if radius <= self._Data.ArcFastRadiusCutoff then
        local a_is_reverse = a_max < a_min

        local a_min_sample_f = IM_DRAWLIST_ARCFAST_SAMPLE_MAX * a_min / (IM_PI * 2.0)
        local a_max_sample_f = IM_DRAWLIST_ARCFAST_SAMPLE_MAX * a_max / (IM_PI * 2.0)

        local a_min_sample = a_is_reverse and ImFloor(a_min_sample_f) or ImCeil(a_min_sample_f)
        local a_max_sample = a_is_reverse and ImCeil(a_max_sample_f) or ImFloor(a_max_sample_f)
        local a_mid_samples = a_is_reverse and ImMax(a_min_sample - a_max_sample, 0) or ImMax(a_max_sample - a_min_sample, 0)

        local a_min_segment_angle = a_min_sample * IM_PI * 2.0 / IM_DRAWLIST_ARCFAST_SAMPLE_MAX
        local a_max_segment_angle = a_max_sample * IM_PI * 2.0 / IM_DRAWLIST_ARCFAST_SAMPLE_MAX
        local a_emit_start = ImAbs(a_min_segment_angle - a_min) >= 1e-5
        local a_emit_end = ImAbs(a_max - a_max_segment_angle) >= 1e-5

        self._Path:reserve(self._Path.Size + (a_mid_samples + 1 + (a_emit_start and 1 or 0) + (a_emit_end and 1 or 0)))

        if a_emit_start      then self._Path:push_back(ImVec2(center.x + ImCos(a_min) * radius, center.y + ImSin(a_min) * radius)) end
        if a_mid_samples > 0 then self:_PathArcToFastEx(center, radius, a_min_sample, a_max_sample, 0) end
        if a_emit_end        then self._Path:push_back(ImVec2(center.x + ImCos(a_max) * radius, center.y + ImSin(a_max) * radius)) end
    else
        local arc_length = ImAbs(a_max - a_min)
        local circle_segment_count = self:_CalcCircleAutoSegmentCount(radius)
        local arc_segment_count = ImMax(ImCeil(circle_segment_count * arc_length / (IM_PI * 2.0)), 1)

        self:_PathArcToN(center, radius, a_min, a_max, arc_segment_count)
    end
end

-- Not recommended to call this directly!
--- @param draw_list   ImDrawList
--- @param size        float
--- @param pos         ImVec2
--- @param col         ImU32
--- @param clip_rect   ImVec4
--- @param text        ImString
--- @param text_begin  int
--- @param text_end    int
--- @param wrap_width? float
--- @param flags?      ImDrawTextFlags
function MT.ImFont:RenderText(draw_list, size, pos, col, clip_rect, text, text_begin, text_end, wrap_width, flags)
    if wrap_width == nil then wrap_width = .0 end
    if flags      == nil then flags      = 0  end

    local x = pos.x
    local y = pos.y
    if y > clip_rect.w then
        return
    end
    if bit32.band(draw_list.Flags, ImDrawListFlags.TextNoPixelSnap) == 0 then
        x = IM_TRUNC(x)
        y = IM_TRUNC(y)
    end

    -- if not text_end then
    -- end

    local line_height = size
    local baked = self:GetFontBaked(size)

    local scale = size / baked.Size
    local origin_x = x
    local word_wrap_enabled = (wrap_width > 0.0)

    local s = text_begin
    if y + line_height < clip_rect.y then
        while y + line_height < clip_rect.y and s < text_end do
            local line_end = ImMemchr(text, '\n', s)
            if word_wrap_enabled then
                s = ImFontCalcWordWrapPositionEx(self, size, text, s, (line_end ~= nil) and line_end or text_end, wrap_width, flags)
                s = ImTextCalcWordWrapNextLineStart(text, s, text_end, flags)
            else
                s = (line_end ~= nil) and (line_end + 1) or text_end
            end

            y = y + line_height
        end
    end

    if text_end - s > 1e4 and not word_wrap_enabled then
        local s_end = s
        local y_end = y
        while (y_end < clip_rect.w and s_end < text_end) do
            local _end = ImMemchr(text, '\n', s_end)
            s_end = (_end ~= nil) and (_end + 1) or text_end
            y_end = y_end + line_height
        end

        text_end = s_end
    end

    if s == text_end then
        return
    end

    local vtx_count_max = (text_end - s) * 4
    local idx_count_max = (text_end - s) * 6
    local idx_expected_size = draw_list.IdxBuffer.Size + idx_count_max
    draw_list:PrimReserve(idx_count_max, vtx_count_max)
    local vtx_write = draw_list._VtxWritePtr
    local idx_write = draw_list._IdxWritePtr
    local vtx_index = draw_list._VtxCurrentIdx
    local cmd_count = draw_list.CmdBuffer.Size
    local cpu_fine_clip = bit32.band(flags, ImDrawTextFlags.CpuFineClip) ~= 0

    local idx_data = draw_list.IdxBuffer.Data; local vtx_data = draw_list.VtxBuffer.Data

    local color_untinted = bit32.bor(col, bit32.bnot(IM_COL32_A_MASK))

    local word_wrap_eol
    local stop = false

    while s < text_end do
        repeat
        if word_wrap_enabled then
            if not word_wrap_eol then
                word_wrap_eol = ImFontCalcWordWrapPositionEx(self, size, text, s, text_end, wrap_width - (x - origin_x), flags)
            end

            if s >= word_wrap_eol then
                x = origin_x
                y = y + line_height
                if y > clip_rect.w then
                    stop = true; break
                end
                word_wrap_eol = nil
                s = ImTextCalcWordWrapNextLineStart(text, s, text_end, flags)

                break
            end
        end

        local c = ImStrByte(text, s)
        if c < 0x80 then
            s = s + 1
        else
            local wanted, out_char = ImStd.ImTextCharFromUtf8(text, s, text_end)
            c = out_char
            s = s + wanted
        end

        if c < 32 then
            if c == 10 then -- '\n'
                x = origin_x
                y = y + line_height
                if y > clip_rect.w then
                    stop = true; break
                end

                break
            end

            if c == 13 then -- '\r'
                break
            end
        end

        local glyph = baked:FindGlyph(c)

        local char_width = glyph.AdvanceX * scale
        if glyph.Visible then
            local x1 = x + glyph.X0 * scale
            local x2 = x + glyph.X1 * scale
            local y1 = y + glyph.Y0 * scale
            local y2 = y + glyph.Y1 * scale
            if x1 <= clip_rect.z and x2 >= clip_rect.x then
                local u1 = glyph.U0
                local v1 = glyph.V0
                local u2 = glyph.U1
                local v2 = glyph.V1

                if (cpu_fine_clip) then
                    if (x1 < clip_rect.x) then
                        u1 = u1 + (1.0 - (x2 - clip_rect.x) / (x2 - x1)) * (u2 - u1)
                        x1 = clip_rect.x
                    end
                    if (y1 < clip_rect.y) then
                        v1 = v1 + (1.0 - (y2 - clip_rect.y) / (y2 - y1)) * (v2 - v1)
                        y1 = clip_rect.y
                    end
                    if (x2 > clip_rect.z) then
                        u2 = u1 + ((clip_rect.z - x1) / (x2 - x1)) * (u2 - u1)
                        x2 = clip_rect.z
                    end
                    if (y2 > clip_rect.w) then
                        v2 = v1 + ((clip_rect.w - y1) / (y2 - y1)) * (v2 - v1)
                        y2 = clip_rect.w
                    end
                    if (y1 >= y2) then
                        x = x + char_width

                        break
                    end
                end

                local glyph_col = glyph.Colored and color_untinted or col

                do
                    local vtx0 = vtx_data[vtx_write + 0]; vtx0[1][1] = x1; vtx0[1][2] = y1; vtx0[3] = glyph_col; vtx0[2][1] = u1; vtx0[2][2] = v1;
                    local vtx1 = vtx_data[vtx_write + 1]; vtx1[1][1] = x2; vtx1[1][2] = y1; vtx1[3] = glyph_col; vtx1[2][1] = u2; vtx1[2][2] = v1;
                    local vtx2 = vtx_data[vtx_write + 2]; vtx2[1][1] = x2; vtx2[1][2] = y2; vtx2[3] = glyph_col; vtx2[2][1] = u2; vtx2[2][2] = v2;
                    local vtx3 = vtx_data[vtx_write + 3]; vtx3[1][1] = x1; vtx3[1][2] = y2; vtx3[3] = glyph_col; vtx3[2][1] = u1; vtx3[2][2] = v2;
                    idx_data[idx_write + 0] = vtx_index; idx_data[idx_write + 1] = vtx_index + 1; idx_data[idx_write + 2] = vtx_index + 2;
                    idx_data[idx_write + 3] = vtx_index; idx_data[idx_write + 4] = vtx_index + 2; idx_data[idx_write + 5] = vtx_index + 3;
                    vtx_write = vtx_write + 4
                    vtx_index = vtx_index + 4
                    idx_write = idx_write + 6
                end
            end
        end

        x = x + char_width

        until true
        if stop then break end
    end

    -- Edge case: calling RenderText() with unloaded glyphs triggering texture change. It doesn't happen via ImGui.* calls because CalcTextSize() is always used
    if cmd_count ~= draw_list.CmdBuffer.Size then
        IM_ASSERT(draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size].ElemCount == 0)
        draw_list.CmdBuffer:pop_back()
        draw_list:PrimUnreserve(idx_count_max, vtx_count_max)
        draw_list:AddDrawCmd()

        return self:RenderText(draw_list, size, pos, col, clip_rect, text, text_begin, text_end, wrap_width, flags) -- was `goto begin`
    end

    draw_list.VtxBuffer.Size = vtx_write - 1
    draw_list.IdxBuffer.Size = idx_write - 1
    draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size].ElemCount = draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size].ElemCount - (idx_expected_size - draw_list.IdxBuffer.Size)
    draw_list._VtxWritePtr = vtx_write
    draw_list._IdxWritePtr = idx_write
    draw_list._VtxCurrentIdx = vtx_index
end

--- @param draw_list ImDrawList
--- @param pos       ImVec2
--- @param color     ImU32
--- @param dir       ImGuiDir
--- @param scale?    float
function ImGui.RenderArrow(draw_list, pos, color, dir, scale)
    if scale == nil then scale = 1.0 end

    local h = draw_list._Data.FontSize * 1.00
    local r = h * 0.40 * scale

    local center = pos + ImVec2(h * 0.50, h * 0.50 * scale)

    local a, b, c

    if dir == ImGuiDir.Up or dir == ImGuiDir.Down then
        if dir == ImGuiDir.Up then r = -r end
        a = ImVec2( 0.000,  0.750) * r
        b = ImVec2(-0.866, -0.750) * r
        c = ImVec2( 0.866, -0.750) * r
    elseif dir == ImGuiDir.Left or dir == ImGuiDir.Right then
        if dir == ImGuiDir.Left then r = -r end
        a = ImVec2( 0.750,  0.000) * r
        b = ImVec2(-0.750,  0.866) * r
        c = ImVec2(-0.750, -0.866) * r
    elseif dir == ImGuiDir.None or dir == ImGuiDir.COUNT then
        IM_ASSERT(false)
    end

    draw_list:AddTriangleFilled(center + a, center + b, center + c, color)
end

--- @param draw_list ImDrawList
--- @param pos       ImVec2
--- @param col       ImU32
function ImGui.RenderBullet(draw_list, pos, col)
    -- FIXME-OPT: This should be baked in font now that it's easier
    local font_size = draw_list._Data.FontSize
    draw_list:AddCircleFilled(pos, font_size * 0.20, col, (font_size < 22) and 8 or ((font_size < 40) and 12 or 0)) -- Hardcode optimal/nice tessellation threshold
end

--- @param draw_list ImDrawList
--- @param pos       ImVec2
--- @param col       ImU32
--- @param sz        float
function ImGui.RenderCheckMark(draw_list, pos, col, sz)
    local thickness = ImMax(sz / 5.0, 1.0)
    sz = sz - thickness * 0.5
    pos = pos + ImVec2(thickness * 0.25, thickness * 0.25)

    local third = sz / 3.0
    local bx = pos.x + third
    local by = pos.y + sz - third * 0.5

    draw_list:PathLineTo(ImVec2(bx - third, by - third))
    draw_list:PathLineTo(ImVec2(bx, by))
    draw_list:PathLineTo(ImVec2(bx + third * 2.0, by - third * 2.0))
    draw_list:PathStroke(col, thickness)
end

-- Render an arrow. 'pos' is position of the arrow tip. half_sz.x is length from base to tip. half_sz.y is length on each side
--- @param draw_list ImDrawList
--- @param pos       ImVec2
--- @param half_sz   ImVec2
--- @param direction ImGuiDir
--- @param col       ImU32
function ImGui.RenderArrowPointingAt(draw_list, pos, half_sz, direction, col)
    if direction == ImGuiDir.Left then
        draw_list:AddTriangleFilled(ImVec2(pos.x + half_sz.x, pos.y - half_sz.y), ImVec2(pos.x + half_sz.x, pos.y + half_sz.y), pos, col)
    elseif direction == ImGuiDir.Right then
        draw_list:AddTriangleFilled(ImVec2(pos.x - half_sz.x, pos.y + half_sz.y), ImVec2(pos.x - half_sz.x, pos.y - half_sz.y), pos, col)
    elseif direction == ImGuiDir.Up then
        draw_list:AddTriangleFilled(ImVec2(pos.x + half_sz.x, pos.y + half_sz.y), ImVec2(pos.x - half_sz.x, pos.y + half_sz.y), pos, col)
    elseif direction == ImGuiDir.Down then
        draw_list:AddTriangleFilled(ImVec2(pos.x - half_sz.x, pos.y - half_sz.y), ImVec2(pos.x + half_sz.x, pos.y - half_sz.y), pos, col)
    elseif direction == ImGuiDir.None or direction == ImGuiDir.COUNT then
    end
end

local function ImAcos01(x)
    if x <= 0.0 then return IM_PI * 0.5 end
    if x >= 1.0 then return 0.0 end
    return ImAcos(x)
end

-- FIXME: Cleanup and move code to ImDrawList
--- @param draw_list ImDrawList
--- @param rect      ImRect
--- @param col       ImU32
--- @param fill_x0   float
--- @param fill_x1   float
--- @param rounding  float
function ImGui.RenderRectFilledInRangeH(draw_list, rect, col, fill_x0, fill_x1, rounding)
    if fill_x0 > fill_x1 then
        return
    end

    local p0 = ImVec2(fill_x0, rect.Min.y)
    local p1 = ImVec2(fill_x1, rect.Max.y)

    if rounding == 0.0 then
        draw_list:AddRectFilled(p0, p1, col, 0.0)
        return
    end

    rounding = ImClamp(ImMin((rect.Max.x - rect.Min.x) * 0.5, (rect.Max.y - rect.Min.y) * 0.5) - 1.0, 0.0, rounding)
    local inv_rounding = 1.0 / rounding
    local arc0_b = ImAcos01(1.0 - (p0.x - rect.Min.x) * inv_rounding)
    local arc0_e = ImAcos01(1.0 - (p1.x - rect.Min.x) * inv_rounding)
    local half_pi = IM_PI * 0.5 -- We will == compare to this because we know this is the exact value ImAcos01 can return.
    local x0 = ImMax(p0.x, rect.Min.x + rounding)

    if arc0_b == arc0_e then
        draw_list:PathLineTo(ImVec2(x0, p1.y))
        draw_list:PathLineTo(ImVec2(x0, p0.y))
    elseif arc0_b == 0.0 and arc0_e == half_pi then
        draw_list:PathArcToFast(ImVec2(x0, p1.y - rounding), rounding, 3, 6) -- BL
        draw_list:PathArcToFast(ImVec2(x0, p0.y + rounding), rounding, 6, 9) -- TR
    else
        draw_list:PathArcTo(ImVec2(x0, p1.y - rounding), rounding, math.pi - arc0_e, math.pi - arc0_b) -- BL
        draw_list:PathArcTo(ImVec2(x0, p0.y + rounding), rounding, math.pi + arc0_b, math.pi + arc0_e) -- TR
    end

    if p1.x > rect.Min.x + rounding then
        local arc1_b = ImAcos01(1.0 - (rect.Max.x - p1.x) * inv_rounding)
        local arc1_e = ImAcos01(1.0 - (rect.Max.x - p0.x) * inv_rounding)
        local x1 = ImMin(p1.x, rect.Max.x - rounding)

        if arc1_b == arc1_e then
            draw_list:PathLineTo(ImVec2(x1, p0.y))
            draw_list:PathLineTo(ImVec2(x1, p1.y))
        elseif arc1_b == 0.0 and arc1_e == half_pi then
            draw_list:PathArcToFast(ImVec2(x1, p0.y + rounding), rounding, 9, 12) -- TR
            draw_list:PathArcToFast(ImVec2(x1, p1.y - rounding), rounding, 0, 3)  -- BR
        else
            draw_list:PathArcTo(ImVec2(x1, p0.y + rounding), rounding, -arc1_e, -arc1_b) -- TR
            draw_list:PathArcTo(ImVec2(x1, p1.y - rounding), rounding, arc1_b, arc1_e)   -- BR
        end
    end

    draw_list:PathFillConvex(col)
end

--- @param r_in      ImRect
--- @param r_outer   ImRect
--- @param threshold float
--- @return ImDrawFlags
function ImGui.CalcRoundingFlagsForRectInRect(r_in, r_outer, threshold)
    local round_l = r_in.Min.x <= r_outer.Min.x + threshold
    local round_r = r_in.Max.x >= r_outer.Max.x - threshold
    local round_t = r_in.Min.y <= r_outer.Min.y + threshold
    local round_b = r_in.Max.y >= r_outer.Max.y - threshold

    local flags = ImDrawFlags.RoundCornersNone

    if round_t and round_l then
        flags = bit32.bor(flags, ImDrawFlags.RoundCornersTopLeft)
    end
    if round_t and round_r then
        flags = bit32.bor(flags, ImDrawFlags.RoundCornersTopRight)
    end
    if round_b and round_l then
        flags = bit32.bor(flags, ImDrawFlags.RoundCornersBottomLeft)
    end
    if round_b and round_r then
        flags = bit32.bor(flags, ImDrawFlags.RoundCornersBottomRight)
    end

    return flags
end

-- Helper for ColorPicker4()
-- NB: This is rather brittle and will show artifact when rounding this enabled if rounded corners overlap multiple cells. Caller currently responsible for avoiding that.
-- Spent a non reasonable amount of time trying to getting this right for ColorButton with rounding+anti-aliasing+ImGuiColorEditFlags_HalfAlphaPreview flag + various grid sizes and offsets, and eventually gave up... probably more reasonable to disable rounding altogether.
-- FIXME: uses ImGui.GetColorU32
--- @param draw_list ImDrawList
--- @param p_min     ImVec2
--- @param p_max     ImVec2
--- @param col       ImU32
--- @param grid_step float
--- @param grid_off  ImVec2
--- @param rounding? float
--- @param flags?    ImDrawFlags
function ImGui.RenderColorRectWithAlphaCheckerboard(draw_list, p_min, p_max, col, grid_step, grid_off, rounding, flags)
    if rounding == nil then rounding = 0.0 end
    if flags    == nil then flags    = 0   end

    if bit32.band(flags, ImDrawFlags.RoundCornersMask_) == 0 then
        flags = ImDrawFlags.RoundCornersDefault_
    end

    if bit32.rshift(bit32.band(col, IM_COL32_A_MASK), IM_COL32_A_SHIFT) < 0xFF then
        local col_bg1 = ImGui.GetColorU32(ImStd.ImAlphaBlendColors(IM_COL32(128, 128, 128, 255), col), nil, true)
        local col_bg2 = ImGui.GetColorU32(ImStd.ImAlphaBlendColors(IM_COL32(204, 204, 204, 255), col), nil, true)
        draw_list:AddRectFilled(p_min, p_max, col_bg1, rounding, flags)

        local yi = 0
        local y = p_min.y + grid_off.y
        local x_start
        local x
        local cell_flags
        while y < p_max.y do
            repeat
            local y1 = ImClamp(y, p_min.y, p_max.y)
            local y2 = ImMin(y + grid_step, p_max.y)

            if y2 <= y1 then
                break
            end

            x_start = p_min.x + grid_off.x + ((yi + 1) % 2) * grid_step
            x = x_start
            while x < p_max.x do
                repeat
                local x1 = ImClamp(x, p_min.x, p_max.x)
                local x2 = ImMin(x + grid_step, p_max.x)

                if x2 <= x1 then
                    break
                end

                cell_flags = ImDrawFlags.RoundCornersNone
                if y1 <= p_min.y then
                    if x1 <= p_min.x then cell_flags = bit32.bor(cell_flags, ImDrawFlags.RoundCornersTopLeft) end
                    if x2 >= p_max.x then cell_flags = bit32.bor(cell_flags, ImDrawFlags.RoundCornersTopRight) end
                end
                if y2 >= p_max.y then
                    if x1 <= p_min.x then cell_flags = bit32.bor(cell_flags, ImDrawFlags.RoundCornersBottomLeft) end
                    if x2 >= p_max.x then cell_flags = bit32.bor(cell_flags, ImDrawFlags.RoundCornersBottomRight) end
                end

                -- Combine flags
                if flags == ImDrawFlags.RoundCornersNone or cell_flags == ImDrawFlags.RoundCornersNone then
                    cell_flags = ImDrawFlags.RoundCornersNone
                else
                    cell_flags = bit32.band(cell_flags, flags)
                end
                draw_list:AddRectFilled(ImVec2(x1, y1), ImVec2(x2, y2), col_bg2, rounding, cell_flags)

                until true

                x = x + grid_step * 2.0
            end

            until true

            y = y + grid_step
            yi = yi + 1
        end
    else
        draw_list:AddRectFilled(p_min, p_max, col, rounding, flags)
    end
end



function ImGui.RenderRectFilledWithHole(draw_list, outer, inner, col, rounding)
    local fill_L = inner.Min.x > outer.Min.x
    local fill_R = inner.Max.x < outer.Max.x
    local fill_U = inner.Min.y > outer.Min.y
    local fill_D = inner.Max.y < outer.Max.y
    local D = ImDrawFlags
    local bor = bit32.bor
    local function f(c, v) return c and 0 or v end
    if fill_L then draw_list:AddRectFilled(ImVec2(outer.Min.x, inner.Min.y), ImVec2(inner.Min.x, inner.Max.y), col, rounding, bor(D.RoundCornersNone, f(fill_U, D.RoundCornersTopLeft), f(fill_D, D.RoundCornersBottomLeft))) end
    if fill_R then draw_list:AddRectFilled(ImVec2(inner.Max.x, inner.Min.y), ImVec2(outer.Max.x, inner.Max.y), col, rounding, bor(D.RoundCornersNone, f(fill_U, D.RoundCornersTopRight), f(fill_D, D.RoundCornersBottomRight))) end
    if fill_U then draw_list:AddRectFilled(ImVec2(inner.Min.x, outer.Min.y), ImVec2(inner.Max.x, inner.Min.y), col, rounding, bor(D.RoundCornersNone, f(fill_L, D.RoundCornersTopLeft), f(fill_R, D.RoundCornersTopRight))) end
    if fill_D then draw_list:AddRectFilled(ImVec2(inner.Min.x, inner.Max.y), ImVec2(inner.Max.x, outer.Max.y), col, rounding, bor(D.RoundCornersNone, f(fill_L, D.RoundCornersBottomLeft), f(fill_R, D.RoundCornersBottomRight))) end
    if fill_L and fill_U then draw_list:AddRectFilled(ImVec2(outer.Min.x, outer.Min.y), ImVec2(inner.Min.x, inner.Min.y), col, rounding, D.RoundCornersTopLeft) end
    if fill_R and fill_U then draw_list:AddRectFilled(ImVec2(inner.Max.x, outer.Min.y), ImVec2(outer.Max.x, inner.Min.y), col, rounding, D.RoundCornersTopRight) end
    if fill_L and fill_D then draw_list:AddRectFilled(ImVec2(outer.Min.x, inner.Max.y), ImVec2(inner.Min.x, outer.Max.y), col, rounding, D.RoundCornersBottomLeft) end
    if fill_R and fill_D then draw_list:AddRectFilled(ImVec2(inner.Max.x, inner.Max.y), ImVec2(outer.Max.x, outer.Max.y), col, rounding, D.RoundCornersBottomRight) end
end

----------------------------------------------------------------
-- Extra primitives (Ngon, Ellipse, Bezier, concave fill)
----------------------------------------------------------------
-- [port] These follow the 1.92 stroker this port uses (no ImDrawFlags_StrokeXXX placement flags).

function MT.ImDrawList:PathEllipticalArcTo(center, radius, rot, a_min, a_max, num_segments)
    if num_segments == nil or num_segments <= 0 then
        num_segments = self:_CalcCircleAutoSegmentCount(ImMax(radius.x, radius.y))
    end
    local cos_rot, sin_rot = ImCos(rot), ImSin(rot)
    for i = 0, num_segments do
        local a = a_min + (i / num_segments) * (a_max - a_min)
        local px, py = ImCos(a) * radius.x, ImSin(a) * radius.y
        self._Path:push_back(ImVec2(px * cos_rot - py * sin_rot + center.x, px * sin_rot + py * cos_rot + center.y))
    end
end

function ImBezierCubicCalc(p1, p2, p3, p4, t)
    local u = 1.0 - t
    local w1, w2, w3, w4 = u * u * u, 3 * u * u * t, 3 * u * t * t, t * t * t
    return ImVec2(w1 * p1.x + w2 * p2.x + w3 * p3.x + w4 * p4.x, w1 * p1.y + w2 * p2.y + w3 * p3.y + w4 * p4.y)
end

function ImBezierQuadraticCalc(p1, p2, p3, t)
    local u = 1.0 - t
    local w1, w2, w3 = u * u, 2 * u * t, t * t
    return ImVec2(w1 * p1.x + w2 * p2.x + w3 * p3.x, w1 * p1.y + w2 * p2.y + w3 * p3.y)
end

local function PathBezierCubicCurveToCasteljau(path, x1, y1, x2, y2, x3, y3, x4, y4, tess_tol, level)
    local dx, dy = x4 - x1, y4 - y1
    local d2 = math.abs((x2 - x4) * dy - (y2 - y4) * dx)
    local d3 = math.abs((x3 - x4) * dy - (y3 - y4) * dx)
    if (d2 + d3) * (d2 + d3) < tess_tol * (dx * dx + dy * dy) then
        path:push_back(ImVec2(x4, y4))
    elseif level < 10 then
        local x12, y12 = (x1 + x2) * 0.5, (y1 + y2) * 0.5
        local x23, y23 = (x2 + x3) * 0.5, (y2 + y3) * 0.5
        local x34, y34 = (x3 + x4) * 0.5, (y3 + y4) * 0.5
        local x123, y123 = (x12 + x23) * 0.5, (y12 + y23) * 0.5
        local x234, y234 = (x23 + x34) * 0.5, (y23 + y34) * 0.5
        local x1234, y1234 = (x123 + x234) * 0.5, (y123 + y234) * 0.5
        PathBezierCubicCurveToCasteljau(path, x1, y1, x12, y12, x123, y123, x1234, y1234, tess_tol, level + 1)
        PathBezierCubicCurveToCasteljau(path, x1234, y1234, x234, y234, x34, y34, x4, y4, tess_tol, level + 1)
    end
end

local function PathBezierQuadraticCurveToCasteljau(path, x1, y1, x2, y2, x3, y3, tess_tol, level)
    local dx, dy = x3 - x1, y3 - y1
    local det = (x2 - x3) * dy - (y2 - y3) * dx
    if det * det * 4.0 < tess_tol * (dx * dx + dy * dy) then
        path:push_back(ImVec2(x3, y3))
    elseif level < 10 then
        local x12, y12 = (x1 + x2) * 0.5, (y1 + y2) * 0.5
        local x23, y23 = (x2 + x3) * 0.5, (y2 + y3) * 0.5
        local x123, y123 = (x12 + x23) * 0.5, (y12 + y23) * 0.5
        PathBezierQuadraticCurveToCasteljau(path, x1, y1, x12, y12, x123, y123, tess_tol, level + 1)
        PathBezierQuadraticCurveToCasteljau(path, x123, y123, x23, y23, x3, y3, tess_tol, level + 1)
    end
end

function MT.ImDrawList:PathBezierCubicCurveTo(p2, p3, p4, num_segments)
    local p1 = self._Path:back()
    if num_segments == nil or num_segments == 0 then
        PathBezierCubicCurveToCasteljau(self._Path, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, p4.x, p4.y, self._Data.CurveTessellationTol, 0)
    else
        local t_step = 1.0 / num_segments
        for i_step = 1, num_segments do self._Path:push_back(ImBezierCubicCalc(p1, p2, p3, p4, t_step * i_step)) end
    end
end

function MT.ImDrawList:PathBezierQuadraticCurveTo(p2, p3, num_segments)
    local p1 = self._Path:back()
    if num_segments == nil or num_segments == 0 then
        PathBezierQuadraticCurveToCasteljau(self._Path, p1.x, p1.y, p2.x, p2.y, p3.x, p3.y, self._Data.CurveTessellationTol, 0)
    else
        local t_step = 1.0 / num_segments
        for i_step = 1, num_segments do self._Path:push_back(ImBezierQuadraticCalc(p1, p2, p3, t_step * i_step)) end
    end
end

function MT.ImDrawList:AddNgon(center, radius, col, num_segments, thickness)
    if thickness == nil then thickness = 1.0 end
    if bit32.band(col, IM_COL32_A_MASK) == 0 or num_segments <= 2 then return end
    local a_max = (IM_PI * 2.0) * (num_segments - 1.0) / num_segments
    self:PathArcTo(center, radius - 0.5, 0.0, a_max, num_segments - 1)
    self:PathStroke(col, thickness, ImDrawFlags.Closed)
end

function MT.ImDrawList:AddNgonFilled(center, radius, col, num_segments)
    if bit32.band(col, IM_COL32_A_MASK) == 0 or num_segments <= 2 then return end
    local a_max = (IM_PI * 2.0) * (num_segments - 1.0) / num_segments
    self:PathArcTo(center, radius, 0.0, a_max, num_segments - 1)
    self:PathFillConvex(col)
end

function MT.ImDrawList:AddEllipse(center, radius, col, rot, num_segments, thickness)
    if rot == nil then rot = 0.0 end
    if thickness == nil then thickness = 1.0 end
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end
    if num_segments == nil or num_segments <= 0 then num_segments = self:_CalcCircleAutoSegmentCount(ImMax(radius.x, radius.y)) end
    local a_max = IM_PI * 2.0 * (num_segments - 1.0) / num_segments
    self:PathEllipticalArcTo(center, radius, rot, 0.0, a_max, num_segments - 1)
    self:PathStroke(col, thickness, ImDrawFlags.Closed)
end

function MT.ImDrawList:AddEllipseFilled(center, radius, col, rot, num_segments)
    if rot == nil then rot = 0.0 end
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end
    if num_segments == nil or num_segments <= 0 then num_segments = self:_CalcCircleAutoSegmentCount(ImMax(radius.x, radius.y)) end
    local a_max = IM_PI * 2.0 * (num_segments - 1.0) / num_segments
    self:PathEllipticalArcTo(center, radius, rot, 0.0, a_max, num_segments - 1)
    self:PathFillConvex(col)
end

function MT.ImDrawList:AddBezierCubic(p1, p2, p3, p4, col, thickness, num_segments)
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end
    self:PathLineTo(p1)
    self:PathBezierCubicCurveTo(p2, p3, p4, num_segments or 0)
    self:PathStroke(col, thickness or 1.0)
end

function MT.ImDrawList:AddBezierQuadratic(p1, p2, p3, col, thickness, num_segments)
    if bit32.band(col, IM_COL32_A_MASK) == 0 then return end
    self:PathLineTo(p1)
    self:PathBezierQuadraticCurveTo(p2, p3, num_segments or 0)
    self:PathStroke(col, thickness or 1.0)
end

-- ponytail: ear-clipping, no anti-aliased fringe (upstream's AA triangulator not ported). O(n^2) is fine for UI polygons.
--- @param points ImVec2[] # 1-based
function MT.ImDrawList:AddConcavePolyFilled(points, points_count, col)
    if points_count < 3 or bit32.band(col, IM_COL32_A_MASK) == 0 then return end
    local idx = {}
    local area = 0.0
    for i = 1, points_count do
        idx[i] = i
        local a, b = points[i], points[i % points_count + 1]
        area = area + (a.x * b.y - b.x * a.y)
    end
    local sign = (area >= 0) and 1 or -1
    local function cross(o, a, b) return (a.x - o.x) * (b.y - o.y) - (a.y - o.y) * (b.x - o.x) end
    local guard = 0
    while #idx > 3 and guard < points_count * points_count do
        guard = guard + 1
        local n = #idx
        local clipped = false
        for i = 1, n do
            local ia, ib, ic = idx[(i - 2) % n + 1], idx[i], idx[i % n + 1]
            local a, b, c = points[ia], points[ib], points[ic]
            if cross(a, b, c) * sign > 0 then
                local inside = false
                for j = 1, n do
                    local p = idx[j]
                    if p ~= ia and p ~= ib and p ~= ic then
                        local q = points[p]
                        if cross(a, b, q) * sign >= 0 and cross(b, c, q) * sign >= 0 and cross(c, a, q) * sign >= 0 then inside = true; break end
                    end
                end
                if not inside then
                    self:AddTriangleFilled(a, b, c, col)
                    table.remove(idx, i)
                    clipped = true
                    break
                end
            end
        end
        if not clipped then break end
    end
    if #idx == 3 then self:AddTriangleFilled(points[idx[1]], points[idx[2]], points[idx[3]], col) end
end

function MT.ImDrawList:PathFillConcave(col)
    self:AddConcavePolyFilled(self._Path.Data, self._Path.Size, col)
    self._Path.Size = 0
end

return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imgui_h.lua'] = function()
--- ImGui Sincerely WIP
-- (Definitions)

--- @meta

local type   = ImGui._GetTypeFunc()
local rawget = rawget; local rawset = rawset

-- [LuaBitOp](https://bitop.luajit.org/semantics.html)
local bitAnd    = bit32.band; local bitOr = bit32.bor
local bitLShift = bit32.lshift

--- @class char          : integer
--- @class unsigned_char : integer

--- @alias ImS8 char
--- @alias ImU8 unsigned_char

--- @class ImU16 : integer
--- @class ImS16 : integer

--- @class ImU32 : integer
--- @class ImS32 : integer

--- @param val number
--- @return ImU8
function ImU8(val) return bitAnd(val, 0xFF) end
--- @param val number
--- @return ImS8
function ImS8(val) return bitAnd(val, 0xFF) - (bitAnd(val, 0x80) ~= 0 and 0x100 or 0) end

--- @param val number
--- @return ImU16
function ImU16(val) return bitAnd(val, 0xFFFF) end
--- @param val number
--- @return ImS16
function ImS16(val) return bitAnd(val, 0xFFFF) - (bitAnd(val, 0x8000) ~= 0 and 0x10000 or 0) end

--- @param val number
--- @return ImU32
function ImU32(val) return bitAnd(val, 0xFFFFFFFF) end
--- @param val number
--- @return ImS32
function ImS32(val) return bitAnd(val, 0xFFFFFFFF) end

--- @alias float          number
--- @class double : number

--- @alias int            integer
--- @alias unsigned_int   integer

--- @alias short          integer
--- @alias unsigned_short integer

--- @alias size_t unsigned_int

--- @alias ImWchar16 unsigned_short
--- @alias ImWchar   ImWchar16

--- @alias bool boolean

--- @alias ImGuiID unsigned_int

--- @alias ImTextureID integer

--- @alias ImGuiKeyChord int

--- @alias ImDrawIdx unsigned_int

IMGUI_VERSION     = "1.93.0 WIP"
IMGUI_VERSION_NUM = 19298

IM_UNICODE_CODEPOINT_INVALID = 0xFFFD
IM_UNICODE_CODEPOINT_MAX     = 0xFFFF

IM_ALLOC = ImGui.MemAlloc
IM_FREE = ImGui.MemFree

--- @param owner table
--- @param field string|int
IM_DELETE = function(owner, field) if owner[field] ~= nil then owner[field] = nil; ImGui.MemFree(owner, field); end end

---------------------------------------------------------------------------------------
-- [SECTION] METATABLE MANAGEMENT
---------------------------------------------------------------------------------------

--- File-scope metatable storage
local MT = {}

function ImGui.GetMetatables() return MT end

--- @param _EXPR any
--- @param _MSG  string?
function IM_ASSERT(_EXPR, _MSG) assert((_EXPR), _MSG) end

IM_ASSERT_PARANOID = IM_ASSERT

--- Note that `S64` and `U64` are not supported
--- @enum ImGuiDataType
ImGuiDataType =
{
    S8     = 0, -- signed char / char
    U8     = 1, -- unsigned char
    S16    = 2, -- short
    U16    = 3, -- unsigned short
    S32    = 4, -- int
    U32    = 5, -- unsigned int
    Float  = 6, -- float
    Double = 7, -- double
    Bool   = 8, -- bool (provided for user convenience, not supported by scalar widgets)
    String = 9, -- string (provided for user convenience, not supported by scalar widgets)
    COUNT  = 10
}

ImTextureID_Invalid = -1

--- @enum ImTextureFormat
ImTextureFormat =
{
    RGBA32 = 0,
    Alpha8 = 1,
}

--- @enum ImTextureStatus
ImTextureStatus =
{
    OK          = 0,
    Destroyed   = 1,
    WantCreate  = 2,
    WantUpdates = 3,
    WantDestroy = 4,
}

--- @enum ImFontAtlasFlags
ImFontAtlasFlags =
{
    None               = 0,
    NoPowerOfTwoHeight = bitLShift(1, 0),
    NoMouseCursors     = bitLShift(1, 1),
    NoBakedLines       = bitLShift(1, 2)
}

--- @enum ImGuiDir
ImGuiDir =
{
    None  = -1,
    Left  = 0,
    Right = 1,
    Up    = 2,
    Down  = 3,
    COUNT = 4
}

--- @enum ImGuiMouseButton
ImGuiMouseButton =
{
    Left   = 0,
    Right  = 1,
    Middle = 2,
    COUNT  = 5
}

--- @enum ImGuiMouseCursor
ImGuiMouseCursor =
{
    None       = -1,
    Arrow      = 0,
    TextInput  = 1,
    ResizeAll  = 2,
    ResizeNS   = 3,
    ResizeEW   = 4,
    ResizeNESW = 5,
    ResizeNWSE = 6,
    Hand       = 7,
    Wait       = 8,
    Progress   = 9,
    NotAllowed = 10,
    COUNT      = 11
}

--- @class ImTextureRect
--- @field x unsigned_short
--- @field y unsigned_short
--- @field w unsigned_short
--- @field h unsigned_short

--- @param x? unsigned_short
--- @param y? unsigned_short
--- @param w? unsigned_short
--- @param h? unsigned_short
--- @return ImTextureRect
function ImTextureRect(x, y, w, h) return { x = x, y = y, w = w, h = h } end

-- This structure supports indexing on string keys `x`, `y` and number keys 1, 2.
-- But note that the former is likely to be more expensive.
--- @class ImVec2
--- @operator add(ImVec2): ImVec2
--- @operator sub(ImVec2): ImVec2
--- @operator mul(number): ImVec2
--- @operator mul(ImVec2): ImVec2
--- @operator div(number): ImVec2
--- @operator div(ImVec2): ImVec2
--- @field [1] number
--- @field [2] number
--- @field x number
--- @field y number
local IM_VEC2 = {}

--- @param t ImVec2
--- @param k string
IM_VEC2.__index = function(t, k)
    if     k == "x" then return rawget(t, 1)
    elseif k == "y" then return rawget(t, 2)
    end
end

--- @param t ImVec2
--- @param k string
--- @param v number
IM_VEC2.__newindex = function(t, k, v)
    if     k == "x" then rawset(t, 1, v)
    elseif k == "y" then rawset(t, 2, v)
    else IM_ASSERT(false)
    end
end

--- @param x? number
--- @param y? number
--- @return ImVec2
--- @nodiscard
function ImVec2(x, y) return setmetatable({x or 0, y or 0}, IM_VEC2) end

function IM_VEC2.__add(lhs, rhs) return ImVec2(lhs[1] + rhs[1], lhs[2] + rhs[2]) end
function IM_VEC2.__sub(lhs, rhs) return ImVec2(lhs[1] - rhs[1], lhs[2] - rhs[2]) end

--- @overload fun(lhs: ImVec2, rhs: number): ImVec2
--- @overload fun(lhs: ImVec2, rhs: ImVec2): ImVec2
function IM_VEC2.__mul(lhs, rhs)
    if     type(lhs) == "table" and type(rhs) == "number" then return ImVec2(lhs[1] * rhs, lhs[2] * rhs)
    elseif type(lhs) == "table" and type(rhs) == "table"  then return ImVec2(lhs[1] * rhs[1], lhs[2] * rhs[2])
    end
end

--- @overload fun(lhs: ImVec2, rhs: number): ImVec2
--- @overload fun(lhs: ImVec2, rhs: ImVec2): ImVec2
function IM_VEC2.__div(lhs, rhs)
    if     type(lhs) == "table" and type(rhs) == "number" then return ImVec2(lhs[1] / rhs, lhs[2] / rhs)
    elseif type(lhs) == "table" and type(rhs) == "table"  then return ImVec2(lhs[1] / rhs[1], lhs[2] / rhs[2])
    end
end

function IM_VEC2.__eq(lhs, rhs) return lhs[1] == rhs[1] and lhs[2] == rhs[2] end

function IM_VEC2:__tostring() return string.format("ImVec2(%g, %g)", self.x, self.y) end

--- @param dest ImVec2
--- @param src  ImVec2
function ImVec2_Copy(dest, src) dest[1] = src[1]; dest[2] = src[2] end

--- @param dest  ImVec2
--- @param src_x number
--- @param src_y number
function ImVec2_CopyV(dest, src_x, src_y) dest[1] = src_x; dest[2] = src_y end

--- @param v     ImVec2
--- @param add_x number
--- @param add_y number
function ImVec2_AddVA(v, add_x, add_y) return v[1] + add_x, v[2] + add_y end

--- @param v     ImVec2
--- @param sub_x number
--- @param sub_y number
function ImVec2_SubVA(v, sub_x, sub_y) return v[1] - sub_x, v[2] - sub_y end

--- @param a      ImVec2
--- @param scalar number
function ImVec2_MulVX(a, scalar)
    return a[1] * scalar, a[2] * scalar
end

--- An inlined version of `ImVec2_Copy` currently for use in certain ImVector<ImVec2> `push_back`
--- @param t ImVec2[]
--- @param k int
--- @param v ImVec2
local function ImVec2_TCopy(t, k, v) local dest = t[k]; dest[1] = v[1]; dest[2] = v[2]; end

-- This structure supports indexing on string keys `x`, `y`, `z`, `w` and number keys 1, 2, 3, 4.
-- But note that the former is likely to be more expensive.
--- @class ImVec4
--- @operator add(ImVec4): ImVec4
--- @operator sub(ImVec4): ImVec4
--- @operator mul(number): ImVec4
--- @field [1] number
--- @field [2] number
--- @field [3] number
--- @field [4] number
--- @field x number
--- @field y number
--- @field z number
--- @field w number
local IM_VEC4 = {}

--- @param t ImVec4
--- @param k string
IM_VEC4.__index = function(t, k)
    if     k == "x" then return rawget(t, 1)
    elseif k == "y" then return rawget(t, 2)
    elseif k == "z" then return rawget(t, 3)
    elseif k == "w" then return rawget(t, 4)
    end
end

--- @param t ImVec4
--- @param k string
--- @param v number
IM_VEC4.__newindex = function(t, k, v)
    if     k == "x" then rawset(t, 1, v)
    elseif k == "y" then rawset(t, 2, v)
    elseif k == "z" then rawset(t, 3, v)
    elseif k == "w" then rawset(t, 4, v)
    else IM_ASSERT(false)
    end
end

--- @param x? number
--- @param y? number
--- @param z? number
--- @param w? number
--- @return ImVec4
--- @nodiscard
function ImVec4(x, y, z, w) return setmetatable({x or 0, y or 0, z or 0, w or 0}, IM_VEC4) end

function IM_VEC4.__add(lhs, rhs) return ImVec4(lhs[1] + rhs[1], lhs[2] + rhs[2], lhs[3] + rhs[3], lhs[4] + rhs[4]) end
function IM_VEC4.__sub(lhs, rhs) return ImVec4(lhs[1] - rhs[1], lhs[2] - rhs[2], lhs[3] - rhs[3], lhs[4] - rhs[4]) end
function IM_VEC4.__mul(lhs, rhs) return ImVec4(lhs[1] * rhs, lhs[2] * rhs, lhs[3] * rhs, lhs[4] * rhs) end
function IM_VEC4.__eq(lhs, rhs) return lhs[1] == rhs[1] and lhs[2] == rhs[2] and lhs[3] == rhs[3] and lhs[4] == rhs[4] end

function IM_VEC4:__tostring() return string.format("ImVec4(%g, %g, %g, %g)", self.x, self.y, self.z, self.w) end

--- @param dest ImVec4
--- @param src  ImVec4
function ImVec4_Copy(dest, src) dest[1] = src[1]; dest[2] = src[2]; dest[3] = src[3]; dest[4] = src[4] end

--- A compact ImVector clone
--- @class ImVector<T>
--- @field Data          T[] # 1-based table
--- @field Size          int # >= 0
--- @field _Constructor  function
--- @field _CopyFunc     function
local IM_VECTOR = {}

-- Support 1-based number key indexing while keep method accessing speed
--- @param t ImVector
--- @param k string|int
--- @return any
IM_VECTOR.__index = function(t, k)
    if k == "Data" then return nil end -- Data has already been discarded
    return IM_VECTOR[k] or t.Data[IM_ASSERT(k >= 1 and k <= t.Size) or k] -- if the mt access turns out nil, the k must be int index into Data
end

--- @param t ImVector
--- @param k int
--- @param v any
IM_VECTOR.__newindex = function(t, k, v)
    if k == "Data" then rawset(t, "Data", v); return; end -- set new Data. old Data is already discarded
    IM_ASSERT(k >= 1 and k <= t.Size)
    t.Data[k] = v
end

local _default_constructor = function() return nil end
local _default_copyfunc = function(t, k, v) t[k] = v end

local function _grow_capacity(v, sz) local new_capacity = (v.Capacity ~= 0) and math.floor(v.Capacity + v.Capacity / 2) or 8; return (new_capacity > sz) and new_capacity or sz; end

--- @param T?         function
--- @param COPY_FUNC? function
--- @return ImVector
--- @nodiscard
function ImVector(T, COPY_FUNC) return setmetatable({Data = nil, Size = 0, Capacity = 0, _Constructor = T or _default_constructor, _CopyFunc = COPY_FUNC or _default_copyfunc}, IM_VECTOR) end

function IM_VECTOR:push_back(value) if self.Size == self.Capacity then self:reserve(_grow_capacity(self, self.Size + 1)) end; self._CopyFunc(self.Data, self.Size + 1, value); self.Size = self.Size + 1; return value end
function IM_VECTOR:pop_back() IM_ASSERT(self.Size > 0); self.Size = self.Size - 1; end
function IM_VECTOR:push_front(value) if self.Size == 0 then self:push_back(value) else self:insert(1, value) end end
function IM_VECTOR:clear() if self.Data then self.Size = 0; self.Capacity = 0; IM_FREE(self, "Data"); self.Data = nil end end
function IM_VECTOR:clear_delete() for i = 1, self.Size do self.Data[i] = nil end self.Size = 0 end
function IM_VECTOR:empty() return self.Size == 0 end
function IM_VECTOR:back()   IM_ASSERT(self.Size > 0) return self.Data[self.Size] end
function IM_VECTOR:erase(i) IM_ASSERT(i >= 1 and i <= self.Size) local removed = (table.remove(self.Data, i)) ~= nil self.Size = self.Size - 1 return removed end
local function _iter(v, i) i = i + 1 if i <= v.Size then return i, v.Data[i] end end
function IM_VECTOR:iter() return _iter, self, 0 end
function IM_VECTOR:find_index(value) for i = 1, self.Size do if self.Data[i] == value then return i end end return nil end
function IM_VECTOR:erase_unsorted(index) IM_ASSERT(index >= 1 and index <= self.Size) local last_idx = self.Size if index ~= last_idx then self.Data[index] = self.Data[last_idx] end self.Data[last_idx] = nil self.Size = self.Size - 1 return true end
function IM_VECTOR:find_erase(value) local idx = self:find_index(value) if idx then return self:erase(idx) end return false end
function IM_VECTOR:find_erase_unsorted(value) local idx = self:find_index(value) if idx then return self:erase_unsorted(idx) end return false end

function IM_VECTOR:reserve(new_capacity)
    if new_capacity <= self.Capacity then return end
    local new_data = IM_ALLOC(self._Constructor, new_capacity)
    if self.Data then
        ImStd.memmove(new_data, 1, self.Data, 1, self.Size)
        IM_FREE(self, "Data")
    end
    self.Data = new_data
    self.Capacity = new_capacity
end

function IM_VECTOR:reserve_discard(new_capacity)
    if new_capacity <= self.Capacity then return end
    if self.Data then IM_FREE(self, "Data") end
    self.Data = IM_ALLOC(self._Constructor, new_capacity)
    self.Capacity = new_capacity
end

function IM_VECTOR:shrink(new_size) IM_ASSERT(new_size <= self.Size) self.Size = new_size end

function IM_VECTOR:resize(new_size, v)
    if new_size > self.Capacity then self:reserve(_grow_capacity(self, new_size)) end
    if v ~= nil and new_size > self.Size then
        local data = self.Data
        for n = self.Size + 1, new_size do data[n] = v end
    end
    self.Size = new_size
end

function IM_VECTOR:swap(other) self.Size, other.Size = other.Size, self.Size; self.Capacity, other.Capacity = other.Capacity, self.Capacity; self.Data, other.Data = other.Data, self.Data end
function IM_VECTOR:contains(v) for i = 1, self.Size do if self.Data[i] == v then return true end end return false end

-- NOTE: This currently does not use type-aware copy!
function IM_VECTOR:insert(pos, value) IM_ASSERT(pos >= 1 and pos <= self.Size + 1); if self.Size == self.Capacity then self:reserve(_grow_capacity(self, self.Size + 1)) end; for i = self.Size, pos, -1 do self.Data[i + 1] = self.Data[i] end self.Data[pos] = value self.Size = self.Size + 1 return value end

-- NOTE: This currently does not copy type related info!
--- @nodiscard
function IM_VECTOR:copy()
    local v = ImVector(); v:resize(self.Size)
    local dest = v.Data; local src = self.Data
    for i = 1, v.Size do dest[i] = src[i] end
    return v
end

-- Not keeping value-key records inside `ImVector`, instead just find it
--- @return int # 0-based index
function IM_VECTOR:index_from_ptr(p)
    local data = self.Data; for i = 1, self.Size do if p == data[i] then return i - 1 end end
    --- @diagnostic disable-next-line
    IM_ASSERT(false, "index_from_ptr failed!")
end

--- @class ImDrawCmd
--- @field ClipRect               ImVec4
--- @field TexRef                 ImTextureRef
--- @field VtxOffset              unsigned_int
--- @field IdxOffset              unsigned_int
--- @field ElemCount              unsigned_int
--- @field UserCallback           ImDrawCallback
--- @field UserCallbackData       any
--- @field UserCallbackDataSize   int
--- @field UserCallbackDataOffset int
local IM_DRAWCMD = {}
IM_DRAWCMD.__index = IM_DRAWCMD

--- @return ImDrawCmd
--- @nodiscard
function ImDrawCmd()
    return setmetatable({
        ClipRect               = ImVec4(),
        TexRef                 = nil,
        VtxOffset              = 0,
        IdxOffset              = 0,
        ElemCount              = 0,
        UserCallback           = nil,
        UserCallbackData       = nil,
        UserCallbackDataSize   = 0,
        UserCallbackDataOffset = 0
    }, IM_DRAWCMD)
end

--- @return ImTextureID
function IM_DRAWCMD:GetTexID()
    local tex_id = (self.TexRef._TexData) and self.TexRef._TexData.TexID or self.TexRef._TexID
    if self.TexRef._TexData ~= nil then
        IM_ASSERT(tex_id ~= ImTextureID_Invalid, "ImDrawCmd is referring to ImTextureData that wasn't uploaded to graphics system. Backend must call ImTextureData::SetTexID() after handling ImTextureStatus_WantCreate request!")
    end
    return tex_id
end

--- @class ImDrawVert
--- @field [1] ImVec2 # pos
--- @field [2] ImVec2 # uv
--- @field [3] ImU32  # col

--- @return ImDrawVert
--- @nodiscard
function ImDrawVert() return { ImVec2(), ImVec2(), nil } end

--- @class ImDrawCmdHeader
--- @field ClipRect  ImVec4
--- @field TexRef    ImTextureRef
--- @field VtxOffset unsigned_int

--- @return ImDrawCmdHeader
--- @nodiscard
function ImDrawCmdHeader() return { ClipRect = ImVec4(), TexRef = nil, VtxOffset = 0 } end

--- @class ImDrawChannel
--- @field _CmdBuffer ImVector<ImDrawCmd>
--- @field _IdxBuffer ImVector<ImDrawIdx>

--- @return ImDrawChannel
--- @nodiscard
function ImDrawChannel() return { _CmdBuffer = ImVector(), _IdxBuffer = ImVector() } end

--- @class ImDrawListSplitter
--- @field _Current  int
--- @field _Count    int
--- @field _Channels ImVector<ImDrawChannel>

--- @return ImDrawListSplitter
--- @nodiscard
MT.ImDrawListSplitter = {} -- methods in imgui_draw.lua
MT.ImDrawListSplitter.__index = MT.ImDrawListSplitter
function ImDrawListSplitter() return setmetatable({ _Current = 0, _Count = 0, _Channels = ImVector() }, MT.ImDrawListSplitter) end

--- @class ImDrawList
--- @field CmdBuffer         ImVector<ImDrawCmd>
--- @field IdxBuffer         ImVector<ImDrawIdx>
--- @field VtxBuffer         ImVector<ImDrawVert>
--- @field Flags             ImDrawListFlags
--- @field _VtxCurrentIdx    unsigned_int         # 1-based, generally == (VtxBuffer.Size + 1)
--- @field _Data             ImDrawListSharedData # Pointes to shared draw data
--- @field _VtxWritePtr      unsigned_int         # 1-based, points to the current writing index in VtxBuffer.Data
--- @field _IdxWritePtr      unsigned_int         # 1-based, points to the current writing index in IdxBuffer.Data
--- @field _Path             ImVector<ImVec2>     # current path building
--- @field _CmdHeader        ImDrawCmdHeader      # template of active commands. Fields should match those of CmdBuffer:back()
--- @field _Splitter         ImDrawListSplitter
--- @field _ClipRectStack    ImVector<ImVec4>
--- @field _TextureStack     ImVector<ImTextureRef>
--- @field _CallbacksDataBuf any
--- @field _FringeScale      float
--- @field _OwnerName        string
MT.ImDrawList = {}
MT.ImDrawList.__index = MT.ImDrawList

--- @param pos ImVec2
--- @param uv  ImVec2
--- @param col ImU32
function MT.ImDrawList:PrimWriteVtx(pos, uv, col)
    local vtx = self.VtxBuffer.Data[self._VtxWritePtr]
    ImVec2_Copy(vtx[1], pos)
    ImVec2_Copy(vtx[2], uv)
    vtx[3] = col
    self._VtxWritePtr = self._VtxWritePtr + 1
    self._VtxCurrentIdx = self._VtxCurrentIdx + 1
end

--- @param idx ImDrawIdx
function MT.ImDrawList:PrimWriteIdx(idx)
    self.IdxBuffer.Data[self._IdxWritePtr] = idx
    self._IdxWritePtr = self._IdxWritePtr + 1
end

--- @param pos ImVec2
--- @param uv  ImVec2
--- @param col ImU32
function MT.ImDrawList:PrimVtx(pos, uv, col)
    self:PrimWriteIdx(self._VtxCurrentIdx)
    self:PrimWriteVtx(pos, uv, col)
end

--- @param data? ImDrawListSharedData
--- @return ImDrawList
--- @nodiscard
function ImDrawList(data)
    --- @type ImDrawList
    local this = setmetatable({
        CmdBuffer = ImVector(),
        IdxBuffer = ImVector(),
        VtxBuffer = ImVector(ImDrawVert),
        Flags     = 0,

        _VtxCurrentIdx = 1,
        _Data          = nil,
        _VtxWritePtr   = 1,
        _IdxWritePtr   = 1,
        _Path          = ImVector(ImVec2, ImVec2_TCopy),
        _CmdHeader     = ImDrawCmdHeader(),
        _Splitter      = ImDrawListSplitter(),
        _ClipRectStack = ImVector(),
        _TextureStack  = ImVector(),
        _CallbacksDataBuf = nil,

        _FringeScale = 0,
        _OwnerName = nil
    }, MT.ImDrawList)

    this:_SetDrawListSharedData(data)

    return this
end

--- @class ImDrawData
--- @field Valid            bool
--- @field FrameCount       int
--- @field TotalIdxCount    int
--- @field TotalVtxCount    int
--- @field CmdLists         ImVector<ImDrawList>
--- @field DisplayPos       ImVec2
--- @field DisplaySize      ImVec2
--- @field FramebufferScale ImVec2
--- @field OwnerViewport    ImGuiViewport
--- @field Textures         ImVector<ImTextureData>
MT.ImDrawData = {}
MT.ImDrawData.__index = MT.ImDrawData

--- @return ImDrawData
function ImDrawData()
    --- @type ImDrawData
    local this = setmetatable({}, MT.ImDrawData)

    this.CmdLists = ImVector()
    this:Clear()

    return this
end

--- @class ImTextureData
--- @field UniqueID             int
--- @field Status               ImTextureStatus
--- @field BackendUserData      any
--- @field QueueUserData        any
--- @field TexID                ImTextureID
--- @field Format               ImTextureFormat
--- @field Width                int
--- @field Height               int
--- @field BytesPerPixel        int
--- @field Pixels               unsigned_char[]
--- @field UsedRect             ImTextureRect
--- @field UpdateRect           ImTextureRect
--- @field Updates              ImVector<ImTextureRect>
--- @field UnusedFrames         int
--- @field RefCount             unsigned_short
--- @field UseColors            bool
--- @field WantDestroyNextFrame bool
MT.ImTextureData = {}
MT.ImTextureData.__index = MT.ImTextureData

--- @return ImTextureData
--- @nodiscard
function ImTextureData()
    --- @type ImTextureData
    local this = setmetatable({}, MT.ImTextureData)

    this.UniqueID             = 0
    this.Status               = ImTextureStatus.Destroyed
    this.BackendUserData      = nil
    this.TexID                = ImTextureID_Invalid
    this.Format               = 0
    this.Width                = 0
    this.Height               = 0
    this.BytesPerPixel        = 0
    this.Pixels               = nil
    this.UsedRect             = ImTextureRect()
    this.UpdateRect           = ImTextureRect()
    this.Updates              = ImVector()
    this.UnusedFrames         = 0
    this.RefCount             = 0
    this.UseColors            = false
    this.WantDestroyNextFrame = false

    return this
end

--- @param x int
--- @param y int
function MT.ImTextureData:GetPixelsAt(x, y)
    return self.Pixels, (x + y * self.Width) * self.BytesPerPixel + 1
end

function MT.ImTextureData:GetPitch() return self.Width * self.BytesPerPixel end
function MT.ImTextureData:GetTexID() return self.TexID end

--- @param tex_id ImTextureID
function MT.ImTextureData:SetTexID(tex_id) self.TexID = tex_id end

--- @param status ImTextureStatus
function MT.ImTextureData:SetStatus(status) self.Status = status if (status == ImTextureStatus.Destroyed and not self.WantDestroyNextFrame and self.Pixels ~= nil) then self.Status = ImTextureStatus.WantCreate end end

--- @class ImTextureRef
--- @field _TexData? ImTextureData
--- @field _TexID    ImTextureID
local IM_TEXTURE_REF = {}
IM_TEXTURE_REF.__index = IM_TEXTURE_REF

--- @return ImTextureRef
--- @nodiscard
function ImTextureRef(tex_id)
    return setmetatable({
        _TexData = nil,
        _TexID   = tex_id or ImTextureID_Invalid
    }, IM_TEXTURE_REF)
end

--- @class ImFontBaked
--- @field IndexAdvanceX        ImVector<float>       # Glyphs->AdvanceX in a directly indexable way. Note that codepoint starts from 0, so IndexAdvanceX.Data[0 + 1] holds the advanceX of glyph at codepoint 0
--- @field FallbackAdvanceX     float
--- @field Size                 float
--- @field RasterizerDensity    float
--- @field IndexLookup          ImVector<ImU16>       # Index glyphs by Unicode codepoint. use IndexLookup.Data[codepoint + 1] for codepoint. Stores 1-based index!
--- @field Glyphs               ImVector<ImFontGlyph>
--- @field FallbackGlyphIndex   int                   # Initial value = -1, then becomes 1-based index if fallback char is set
--- @field Ascent               float
--- @field Descent              float
--- @field MetricsTotalSurface  unsigned_int
--- @field WantDestroy          bool
--- @field LoadNoFallback       bool
--- @field LoadNoRenderOnLayout bool
--- @field LastUsedFrame        int
--- @field BakedId              ImGuiID
--- @field OwnerFont            ImFont
--- @field FontLoaderDatas      any
MT.ImFontBaked = {}
MT.ImFontBaked.__index = MT.ImFontBaked

--- @return ImFontBaked
--- @nodiscard
function ImFontBaked()
    --- @type ImFontBaked
    local this = setmetatable({}, MT.ImFontBaked)

    this.IndexAdvanceX     = ImVector()
    this.FallbackAdvanceX  = 0
    this.Size              = 0
    this.RasterizerDensity = 0

    this.IndexLookup        = ImVector()
    this.Glyphs             = ImVector()
    this.FallbackGlyphIndex = -1

    this.Ascent               = 0
    this.Descent              = 0
    this.MetricsTotalSurface  = 0
    this.WantDestroy          = false
    this.LoadNoFallback       = false
    this.LoadNoRenderOnLayout = false
    this.LastUsedFrame        = 0
    this.BakedId              = 0
    this.OwnerFont            = nil
    this.FontLoaderDatas      = nil

    return this
end

--- @class ImFont
--- @field LastBaked                ImFontBaked
--- @field OwnerAtlas               ImFontAtlas
--- @field Flags                    ImFontFlags
--- @field CurrentRasterizerDensity float
--- @field FontId                   ImGuiID
--- @field LegacySize               float
--- @field Sources                  ImVector<ImFontConfig>
--- @field EllipsisChar             ImWchar
--- @field FallbackChar             ImWchar
--- @field Used8kPagesMap           ImU8[]                 # 1-based table
--- @field EllipsisAutoBake         bool
--- @field RemapPairs               table<ImGuiID, any>    # LUA: No ImGuiStorage
--- @field Scale                    float
MT.ImFont = {}
MT.ImFont.__index = MT.ImFont

function MT.ImFont:IsLoaded() return self.OwnerAtlas ~= nil end
function MT.ImFont:GetDebugName() if self.Sources.Size > 0 then return self.Sources[1].Name else return "<unknown>" end end

--- @return ImFont
--- @nodiscard
function ImFont()
    --- @type ImFont
    local this = setmetatable({}, MT.ImFont)

    this.LastBaked                = nil
    this.OwnerAtlas               = nil
    this.Flags                    = 0
    this.CurrentRasterizerDensity = 0
    this.FontId           = 0
    this.LegacySize       = 0
    this.Sources          = ImVector()
    this.EllipsisChar     = 0
    this.FallbackChar     = 0
    this.Used8kPagesMap   = {}
    this.EllipsisAutoBake = false
    this.RemapPairs       = {}
    this.Scale            = 0

    return this
end

--- @class ImFontConfig
--- @field Name                 string
--- @field FontData             table
--- @field FontDataSize         int
--- @field FontDataOwnedByAtlas bool
--- @field MergeMode            bool
--- @field PixelSnapH           bool
--- @field OversampleH          ImS8
--- @field OversampleV          ImS8
--- @field EllipsisChar         ImWchar
--- @field SizePixels           float
--- @field GlyphRanges          ImWchar[]
--- @field GlyphExcludeRanges   ImWchar[]
--- @field GlyphOffset          ImVec2
--- @field GlyphMinAdvanceX     float
--- @field GlyphMaxAdvanceX     float
--- @field GlyphExtraAdvanceX   float
--- @field FontNo               ImU32
--- @field FontLoaderFlags      unsigned_int
--- @field RasterizerMultiply   float
--- @field RasterizerDensity    float
--- @field ExtraSizeScale       float
--- @field Flags                ImFontFlags
--- @field DstFont              ImFont
--- @field FontLoader           ImFontLoader
--- @field FontLoaderData       any
local IM_FONT_CONFIG = {}
IM_FONT_CONFIG.__index = IM_FONT_CONFIG

--- @return ImFontConfig
--- @nodiscard
function ImFontConfig()
    --- @type ImFontConfig
    local this = setmetatable({}, IM_FONT_CONFIG)

    this.Name                 = nil
    this.FontData             = nil
    this.FontDataSize         = 0
    this.FontDataOwnedByAtlas = true

    this.MergeMode          = false
    this.PixelSnapH         = false
    this.OversampleH        = 0
    this.OversampleV        = 0
    this.EllipsisChar       = 0
    this.SizePixels         = 0
    this.GlyphRanges        = nil
    this.GlyphExcludeRanges = nil
    this.GlyphOffset        = ImVec2()
    this.GlyphMinAdvanceX   = 0
    this.GlyphMaxAdvanceX   = FLT_MAX
    this.GlyphExtraAdvanceX = 0
    this.FontNo             = 0
    this.FontLoaderFlags    = 0
    this.RasterizerMultiply = 1.0
    this.RasterizerDensity  = 1.0
    this.ExtraSizeScale     = 1.0

    this.Flags          = 0
    this.DstFont        = nil
    this.FontLoader     = nil
    this.FontLoaderData = nil

    return this
end

--- @class ImFontAtlas
--- @field Flags               ImFontAtlasFlags
--- @field TexDesiredFormat    ImTextureFormat
--- @field TexGlyphPadding     int
--- @field TexMinWidth         int
--- @field TexMinHeight        int
--- @field TexMaxWidth         int
--- @field TexMaxHeight        int
--- @field TexRef              ImTextureRef
--- @field TexData             ImTextureData
--- @field TexList             ImVector<ImTextureData>
--- @field Locked              bool
--- @field RendererHasTextures bool
--- @field TexPixelsUseColors  bool
--- @field TexUvScale          ImVec2
--- @field TexUvWhitePixel     ImVec2
--- @field Fonts               ImVector<ImFont>
--- @field Sources             ImVector<ImFontConfig>
--- @field TexUvLines          ImVec4[]                       # 0-based table
--- @field TexNextUniqueID     int
--- @field FontNextUniqueID    int
--- @field DrawListSharedDatas ImVector<ImDrawListSharedData>
--- @field Builder             ImFontAtlasBuilder
--- @field FontLoader          ImFontLoader
--- @field FontLoaderName      string
--- @field FontLoaderData      any
--- @field FontLoaderFlags     unsigned_int
--- @field RefCount            int
--- @field OwnerContext        ImGuiContext
MT.ImFontAtlas = {}
MT.ImFontAtlas.__index = MT.ImFontAtlas

--- @return ImFontAtlas
--- @nodiscard
function ImFontAtlas()
    --- @type ImFontAtlas
    local this = setmetatable({}, MT.ImFontAtlas)

    this.Flags               = 0
    this.TexDesiredFormat    = ImTextureFormat.RGBA32
    this.TexGlyphPadding     = 1
    this.TexMinWidth         = 512
    this.TexMinHeight        = 128
    this.TexMaxWidth         = 8192
    this.TexMaxHeight        = 8192

    this.TexRef              = ImTextureRef()

    this.TexData             = nil

    this.TexList             = ImVector()
    this.Locked              = false
    this.RendererHasTextures = false
    this.TexPixelsUseColors  = nil
    this.TexUvScale          = nil
    this.TexUvWhitePixel     = nil
    this.Fonts               = ImVector()
    this.Sources             = ImVector()
    this.TexUvLines          = {}
    this.TexNextUniqueID     = 1
    this.FontNextUniqueID    = 1
    this.DrawListSharedDatas = ImVector()
    this.Builder             = nil
    this.FontLoader          = nil
    this.FontLoaderName      = nil
    this.FontLoaderData      = nil
    this.FontLoaderFlags     = nil
    this.RefCount            = 0
    this.OwnerContext        = nil

    return this
end

--- @class ImFontAtlasRect
--- @field x   unsigned_short
--- @field y   unsigned_short
--- @field w   unsigned_short
--- @field h   unsigned_short
--- @field uv0 ImVec2
--- @field uv1 ImVec2

--- @alias ImFontAtlasRectId int

ImFontAtlasRectId_Invalid = -1

--- @return ImFontAtlasRect
--- @nodiscard
function ImFontAtlasRect()
    return {
        x = nil, y = nil,
        w = nil, h = nil,
        uv0 = ImVec2(),
        uv1 = ImVec2()
    }
end

--- @class ImFontGlyph
--- @field Colored   boolean
--- @field Visible   boolean
--- @field SourceIdx unsigned_int
--- @field Codepoint unsigned_int
--- @field AdvanceX  float
--- @field X0        float
--- @field Y0        float
--- @field X1        float
--- @field Y1        float
--- @field U0        float
--- @field V0        float
--- @field U1        float
--- @field V1        float
--- @field PackId    int

--- @return ImFontGlyph
--- @nodiscard
function ImFontGlyph()
    return {
        Colored   = false,
        Visible   = false,
        SourceIdx = 0,
        Codepoint = 0,
        AdvanceX  = 0,

        X0 = 0, Y0 = 0, X1 = 0, Y1 = 0,
        U0 = 0, V0 = 0, U1 = 0, V1 = 0,

        PackId = -1
    }
end

--- @class ImGuiKeyData
--- @field Down             bool
--- @field DownDuration     float
--- @field DownDurationPrev float
--- @field AnalogValue      float

--- @return ImGuiKeyData
--- @nodiscard
function ImGuiKeyData() return { Down = false, DownDuration = 0.0, DownDurationPrev = 0.0, AnalogValue = 0.0 } end

--- @enum ImGuiConfigFlags
ImGuiConfigFlags = {
    None                = 0,
    NavEnableKeyboard   = bitLShift(1, 0),
    NavEnableGamepad    = bitLShift(1, 1),
    NoMouse             = bitLShift(1, 4),
    NoMouseCursorChange = bitLShift(1, 5),
    NoKeyboard          = bitLShift(1, 6),
    DockingEnable       = bitLShift(1, 7),
    ViewportsEnable     = bitLShift(1, 10),
    IsSRGB              = bitLShift(1, 20),
    IsTouchScreen       = bitLShift(1, 21)
}

--- @class ImGuiIO
MT.ImGuiIO = {}
MT.ImGuiIO.__index = MT.ImGuiIO

--- @return ImGuiIO
function ImGuiIO()
    local this = {
        Ctx = nil,

        KeyCtrl  = false,
        KeyShift = false,
        KeyAlt   = false,
        KeySuper = false,

        KeyMods  = nil,

        BackendFlags = ImGuiBackendFlags.None,
        ConfigFlags  = ImGuiConfigFlags.None,
        DisplaySize = ImVec2(-1.0, -1.0),

        DeltaTime = 1.0 / 60.0,

        DisplayFramebufferScale = ImVec2(1.0, 1.0),

        MousePos = ImVec2(),
        MousePosPrev = ImVec2(),

        WantSetMousePos = false,

        MouseDelta = ImVec2(),

        MouseDown = {[0] = false, [1] = false, [2] = false},

        MouseWheel = 0,
        MouseWheelH = 0,

        MouseCtrlLeftAsRightClick = false,

        MouseWheelRequestAxisSwap = false,

        ConfigColorEditFlags = ImGuiColorEditFlags.DefaultOptions_,

        ConfigMacOSXBehaviors = false,
        ConfigNavCursorVisibleAuto = true,
        ConfigNavCursorVisibleAlways = false,
        ConfigInputTrickleEventQueue = true,
        ConfigWindowsResizeFromEdges = true,

        ConfigDebugIniSettings = false,
        ConfigWindowsCopyContentsWithCtrlC = false,
        ConfigWindowsMoveFromTitleBarOnly = false,
        ConfigErrorRecovery = true,
        ConfigErrorRecoveryEnableAssert = true,
        ConfigErrorRecoveryEnableDebugLog = true,
        ConfigErrorRecoveryEnableTooltip = true,
        ConfigDebugHighlightIdConflicts = false,
        ConfigDebugHighlightIdConflictsShowItemPicker = true,

        IniFilename = "imgui.ini", -- Roblox: no disk access, only used as a flag (nil disables .ini handling)
        IniSavingRate = 5.0,
        LogFilename = "imgui_log.txt",
        WantSaveIniSettings = false,

        ConfigDockingNoSplit = false,
        ConfigDockingNoDockingOver = false,
        ConfigDockingWithShift = false,
        ConfigDockingAlwaysTabBar = false,
        ConfigDockingTransparentPayload = false,
        ConfigViewportsNoAutoMerge = false,
        ConfigViewportsNoTaskBarIcon = false,
        ConfigViewportsNoDecoration = true,
        ConfigViewportsNoDefaultParent = true,
        ConfigViewportsPlatformFocusSetsImGuiFocus = true,

        ConfigMemoryCompactTimer = 60.0,

        MouseDrawCursor = false,

        MouseClicked          = {[0] = false, [1] = false, [2] = false},
        MouseReleased         = {[0] = false, [1] = false, [2] = false},
        MouseClickedCount     = {[0] =  0, [1] =  0, [2] =  0},
        MouseClickedLastCount = {[0] =  0, [1] =  0, [2] =  0},
        MouseDownDuration     = {[0] = -1, [1] = -1, [2] = -1},
        MouseDownDurationPrev = {[0] = -1, [1] = -1, [2] = -1},

        MouseDragMaxDistanceAbs = {[0] = ImVec2(), [1] = ImVec2(), [2] = ImVec2()},
        MouseDragMaxDistanceSqr = {[0] = 0, [1] = 0, [2] = 0},

        MouseDownOwned    = {[0] = nil, [1] = nil, [2] = nil},
        MouseDownOwnedUnlessPopupClose = {[0] = nil, [1] = nil, [2] = nil},
        MouseClickedTime  = {[0] = 0, [1] = 0, [2] = 0},
        MouseReleasedTime = {[0] = 0, [1] = 0, [2] = 0},
        MouseClickedPos   = {[0] = ImVec2(), [1] = ImVec2(), [2] = ImVec2()},

        MouseDoubleClicked = {[0] = false, [1] = false, [2] = false},

        MouseDoubleClickTime    = 0.30,
        MouseSingleClickDelay   = 0.50,
        MouseDoubleClickMaxDist = 6.0,
        MouseDragThreshold      = 6.0,
        KeyRepeatDelay          = 0.275,
        KeyRepeatRate           = 0.050,

        KeysData = {}, -- size = ImGuiKey.NamedKey_COUNT

        WantCaptureMouse    = nil,
        WantCaptureKeyboard = nil,
        WantTextInput       = nil,

        Framerate = 0,

        NavActive = false,
        NavVisible = false,

        MetricsRenderWindows = 0,

        Fonts = nil,
        FontDefault = nil,

        BackendPlatformUserData = nil,
        BackendRendererUserData = nil,

        InputQueueCharacters = ImVector(),

        AppAcceptingEvents = true,
        InputQueueSurrogate = 0
    }

    for i = 0, ImGuiKey.NamedKey_COUNT - 1 do
        this.KeysData[i] = ImGuiKeyData()
    end

    return setmetatable(this, MT.ImGuiIO)
end

--- @class ImGuiPlatformImeData
--- @field WantVisible     bool
--- @field WantTextInput   bool
--- @field InputPos        ImVec2
--- @field InputLineHeight float
--- @field ViewportId      ImGuiID

--- @return ImGuiPlatformImeData
--- @nodiscard
function ImGuiPlatformImeData()
    return {
        WantVisible     = false,
        WantTextInput   = false,
        InputPos        = ImVec2(),
        InputLineHeight = 0.0,
        ViewportId      = 0
    }
end

--- @param dest ImGuiPlatformImeData
--- @param src  ImGuiPlatformImeData
function ImGuiPlatformImeData_Copy(dest, src)
    dest.WantVisible = src.WantVisible
    dest.WantTextInput = src.WantTextInput
    ImVec2_Copy(dest.InputPos, src.InputPos)
    dest.InputLineHeight = src.InputLineHeight
    dest.ViewportId = src.ViewportId
end

--- @param data1 ImGuiPlatformImeData
--- @param data2 ImGuiPlatformImeData
function ImGuiPlatformImeData_Compare(data1, data2)
    if data1.WantVisible ~= data2.WantVisible or
        data1.WantTextInput ~= data2.WantTextInput or
        data1.InputPos ~= data2.InputPos or
        data1.InputLineHeight ~= data2.InputLineHeight or
        data1.ViewportId ~= data2.ViewportId then
        return false
    end

    return true
end

--- @enum ImGuiViewportFlags
ImGuiViewportFlags = {
    None                = 0,
    IsPlatformWindow    = bitLShift(1, 0),
    IsPlatformMonitor   = bitLShift(1, 1),
    OwnedByApp          = bitLShift(1, 2),
    NoDecoration        = bitLShift(1, 3),
    NoTaskBarIcon       = bitLShift(1, 4),
    NoFocusOnAppearing  = bitLShift(1, 5),
    NoFocusOnClick      = bitLShift(1, 6),
    NoInputs            = bitLShift(1, 7),
    NoRendererClear     = bitLShift(1, 8),
    NoAutoMerge         = bitLShift(1, 9),
    TopMost             = bitLShift(1, 10),
    CanHostOtherWindows = bitLShift(1, 11),

    IsMinimized = bitLShift(1, 12),
    IsFocused   = bitLShift(1, 13)
}

--- @class ImGuiViewport
--- @field ID                    ImGuiID
--- @field Flags                 ImGuiViewportFlags
--- @field Pos                   ImVec2
--- @field Size                  ImVec2
--- @field FramebufferScale      ImVec2
--- @field WorkPos               ImVec2
--- @field WorkSize              ImVec2
--- @field DpiScale              float
--- @field ParentViewportId      ImGuiID
--- @field ParentViewport        ImGuiViewport
--- @field DrawData              ImDrawData
--- @field RendererUserData      any
--- @field PlatformUserData      any
--- @field PlatformHandle        any
--- @field PlatformHandleRaw     any
--- @field PlatformWindowCreated bool
--- @field PlatformRequestMove   bool
--- @field PlatformRequestResize bool
--- @field PlatformRequestClose  bool
MT.ImGuiViewport = {}
MT.ImGuiViewport.__index = MT.ImGuiViewport

function MT.ImGuiViewport:GetCenter()
    return ImVec2(self.Pos.x + self.Size.x * 0.5, self.Pos.y + self.Size.y * 0.5)
end

function MT.ImGuiViewport:GetWorkCenter()
    return ImVec2(self.WorkPos.x + self.WorkSize.x * 0.5, self.WorkPos.y + self.WorkSize.y * 0.5)
end

--- @return ImGuiViewport
--- @nodiscard
function ImGuiViewport()
    return setmetatable({
        ID       = 0,
        Flags    = 0,
        Pos      = ImVec2(),
        Size     = ImVec2(),
        FramebufferScale = ImVec2(),
        WorkPos  = ImVec2(),
        WorkSize = ImVec2(),
        DpiScale = 0,

        PlatformHandle = nil,
        PlatformHandleRaw = nil,
        PlatformWindowCreated = false
    }, MT.ImGuiViewport)
end

--- @class ImGuiPlatformIO
--- @field Platform_GetClipboardTextFn fun(ctx?: ImGuiContext): string
--- @field Platform_CreateWindow       fun(vp: ImGuiViewport)
--- @field Platform_OnChangedViewport  fun(vp: ImGuiViewport)
--- @field Monitors                    ImVector<ImGuiPlatformMonitor>
--- @field Textures                    ImVector<ImTextureData>
--- @field Viewports                   ImVector<ImGuiViewport>
MT.ImGuiPlatformIO = {}
MT.ImGuiPlatformIO.__index = MT.ImGuiPlatformIO

--- @return ImGuiPlatformIO
--- @nodiscard
function ImGuiPlatformIO()
    local this = {
        Platform_GetClipboardTextFn = nil,
        Platform_SetClipboardTextFn = nil,

        Platform_OpenInShellFn = nil,
        Platform_OpenInShellUserData = nil,

        Renderer_TextureMaxWidth = 0,
        Renderer_TextureMaxHeight = 0,

        Renderer_RenderState = nil,

        Monitors = ImVector(),
        Textures = ImVector(),
        Viewports = ImVector(),

        Platform_LocaleDecimalPoint = 46, -- '.'

        Platform_OnChangedViewport = nil,
    }

    return setmetatable(this, MT.ImGuiPlatformIO)
end

--- @class ImGuiPlatformMonitor
--- @field MainPos        ImVec2
--- @field MainSize       ImVec2
--- @field WorkPos        ImVec2
--- @field WorkSize       ImVec2
--- @field DpiScale       float
--- @field PlatformHandle any

--- @return ImGuiPlatformMonitor
--- @nodiscard
function ImGuiPlatformMonitor()
    return {
        MainPos  = ImVec2(0, 0),
        MainSize = ImVec2(0, 0),
        WorkPos  = ImVec2(0, 0),
        WorkSize = ImVec2(0, 0),
        DpiScale = 1.0,

        PlatformHandle = nil
    }
end

--- @enum ImGuiWindowFlags
ImGuiWindowFlags = {
    None                      = 0,
    NoTitleBar                = bitLShift(1, 0),
    NoResize                  = bitLShift(1, 1),
    NoMove                    = bitLShift(1, 2),
    NoScrollbar               = bitLShift(1, 3),
    NoScrollWithMouse         = bitLShift(1, 4),
    NoCollapse                = bitLShift(1, 5),
    AlwaysAutoResize          = bitLShift(1, 6),
    NoBackground              = bitLShift(1, 7),
    NoSavedSettings           = bitLShift(1, 8),
    NoMouseInputs             = bitLShift(1, 9),
    MenuBar                   = bitLShift(1, 10),
    HorizontalScrollbar       = bitLShift(1, 11),
    NoFocusOnAppearing        = bitLShift(1, 12),
    NoBringToFrontOnFocus     = bitLShift(1, 13),
    AlwaysVerticalScrollbar   = bitLShift(1, 14),
    AlwaysHorizontalScrollbar = bitLShift(1, 15),
    NoNavInputs               = bitLShift(1, 16),
    NoNavFocus                = bitLShift(1, 17),
    UnsavedDocument           = bitLShift(1, 18),
    NoDocking                 = bitLShift(1, 19),
    DockNodeHost              = bitLShift(1, 23),
    ChildWindow               = bitLShift(1, 24),
    Tooltip                   = bitLShift(1, 25),
    Popup                     = bitLShift(1, 26),
    Modal                     = bitLShift(1, 27),
    ChildMenu                 = bitLShift(1, 28)
}

-- [Internal]
ImGuiWindowFlags.NoNav        = bitOr(ImGuiWindowFlags.NoNavInputs, ImGuiWindowFlags.NoNavFocus)
ImGuiWindowFlags.NoDecoration = bitOr(ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoScrollbar, ImGuiWindowFlags.NoCollapse)
ImGuiWindowFlags.NoInputs     = bitOr(ImGuiWindowFlags.NoMouseInputs, ImGuiWindowFlags.NoNavInputs, ImGuiWindowFlags.NoNavFocus)

--- @enum ImGuiItemFlags
ImGuiItemFlags = {
    None                  = 0,
    NoTabStop             = bitLShift(1, 0),
    NoNav                 = bitLShift(1, 1),
    NoNavDefaultFocus     = bitLShift(1, 2),
    ButtonRepeat          = bitLShift(1, 3),
    AutoClosePopups       = bitLShift(1, 4),
    AllowDuplicateId      = bitLShift(1, 5),
    Disabled              = bitLShift(1, 6),
    LiveEditOnInputText   = bitLShift(1, 7),
    LiveEditOnInputScalar = bitLShift(1, 8)
}

ImGuiItemFlags.LiveEditOnInput = bitOr(ImGuiItemFlags.LiveEditOnInputText, ImGuiItemFlags.LiveEditOnInputScalar)

--- @enum ImGuiItemStatusFlags
ImGuiItemStatusFlags = {
    None             = 0,
    HoveredRect      = bitLShift(1, 0),
    HasDisplayRect   = bitLShift(1, 1),
    Edited           = bitLShift(1, 2),
    ToggledSelection = bitLShift(1, 3),
    ToggledOpen      = bitLShift(1, 4),
    HasDeactivated   = bitLShift(1, 5),
    Deactivated      = bitLShift(1, 6),
    HoveredWindow    = bitLShift(1, 7),
    Visible          = bitLShift(1, 8),
    HasClipRect      = bitLShift(1, 9),
    HasShortcut      = bitLShift(1, 10),
    EditedInternal   = bitLShift(1, 11)
}

--- @enum ImGuiChildFlags
ImGuiChildFlags = {
    None                   = 0,
    Borders                = bitLShift(1, 0),
    AlwaysUseWindowPadding = bitLShift(1, 1),
    ResizeX                = bitLShift(1, 2),
    ResizeY                = bitLShift(1, 3),
    AutoResizeX            = bitLShift(1, 4),
    AutoResizeY            = bitLShift(1, 5),
    AlwaysAutoResize       = bitLShift(1, 6),
    FrameStyle             = bitLShift(1, 7),
    NavFlattened           = bitLShift(1, 8)
}

ImGuiChildFlags.ResizeBoth = bitOr(ImGuiChildFlags.ResizeX, ImGuiChildFlags.ResizeY)
ImGuiChildFlags.ResizeXAndY = ImGuiChildFlags.ResizeBoth

--- @enum ImGuiNextItemDataFlags
ImGuiNextItemDataFlags = {
    None           = 0,
    HasWidth       = bitLShift(1, 0),
    HasOpen        = bitLShift(1, 1),
    HasShortcut    = bitLShift(1, 2),
    HasRefVal      = bitLShift(1, 3),
    HasStorageID   = bitLShift(1, 4),
    HasColorMarker = bitLShift(1, 5)
}

--- @enum ImDrawFlags
ImDrawFlags = {
    None                    = 0,
    RoundCornersTopLeft     = bitLShift(1, 4),
    RoundCornersTopRight    = bitLShift(1, 5),
    RoundCornersBottomLeft  = bitLShift(1, 6),
    RoundCornersBottomRight = bitLShift(1, 7),
    RoundCornersNone        = bitLShift(1, 8),
    Closed                  = bitLShift(1, 9)
}

ImDrawFlags.RoundCornersTop      = bitOr(ImDrawFlags.RoundCornersTopLeft, ImDrawFlags.RoundCornersTopRight)
ImDrawFlags.RoundCornersBottom   = bitOr(ImDrawFlags.RoundCornersBottomLeft, ImDrawFlags.RoundCornersBottomRight)
ImDrawFlags.RoundCornersLeft     = bitOr(ImDrawFlags.RoundCornersBottomLeft, ImDrawFlags.RoundCornersTopLeft)
ImDrawFlags.RoundCornersRight    = bitOr(ImDrawFlags.RoundCornersBottomRight, ImDrawFlags.RoundCornersTopRight)
ImDrawFlags.RoundCornersAll      = bitOr(ImDrawFlags.RoundCornersTopLeft, ImDrawFlags.RoundCornersTopRight, ImDrawFlags.RoundCornersBottomLeft, ImDrawFlags.RoundCornersBottomRight)
ImDrawFlags.RoundCornersDefault_ = ImDrawFlags.RoundCornersAll
ImDrawFlags.RoundCornersMask_    = bitOr(ImDrawFlags.RoundCornersAll, ImDrawFlags.RoundCornersNone)
ImDrawFlags.InvalidMask_         = 0x8000000F

--- @enum ImDrawListFlags
ImDrawListFlags = {
    None                   = 0,
    AntiAliasedLines       = bitLShift(1, 0),
    AntiAliasedLinesUseTex = bitLShift(1, 1),
    AntiAliasedFill        = bitLShift(1, 2),
    AllowVtxOffset         = bitLShift(1, 3),
    TextNoPixelSnap        = bitLShift(1, 4)
}

--- @enum ImFontFlags
ImFontFlags = {
    None            = 0,
    NoLoadError     = bitLShift(1, 1),
    NoLoadGlyphs    = bitLShift(1, 2),
    LockBakedSizes  = bitLShift(1, 3),
    ImplicitRefSize = bitLShift(1, 4)
}

--- @enum ImGuiMouseSource
ImGuiMouseSource = {
    Mouse       = 0,
    TouchScreen = 1,
    Pen         = 2,
    COUNT       = 3
}

--- @enum ImGuiCond
ImGuiCond = {
    None          = 0,
    Always        = bitLShift(1, 0),
    Once          = bitLShift(1, 1),
    FirstUseEver  = bitLShift(1, 2),
    Appearing     = bitLShift(1, 3)
}

--- @enum ImGuiInputFlags
ImGuiInputFlags = {
    None                 = 0,
    Repeat               = bitLShift(1, 0),
    RouteActive          = bitLShift(1, 10),
    RouteFocused         = bitLShift(1, 11),
    RouteGlobal          = bitLShift(1, 12),
    RouteAlways          = bitLShift(1, 13),
    RouteOverFocused     = bitLShift(1, 14),
    RouteOverActive      = bitLShift(1, 15),
    RouteUnlessBgFocused = bitLShift(1, 16),
    RouteFromRootWindow  = bitLShift(1, 17),
    Tooltip              = bitLShift(1, 18)
}

--- @enum ImGuiButtonFlags
ImGuiButtonFlags = {
    None                          = 0,
    MouseButtonLeft               = bitLShift(1, 0),
    MouseButtonRight              = bitLShift(1, 1),
    MouseButtonMiddle             = bitLShift(1, 2),
    EnableNav                     = bitLShift(1, 3),
    PressedOnClick                = bitLShift(1, 4),
    PressedOnClickRelease         = bitLShift(1, 5),
    PressedOnClickReleaseAnywhere = bitLShift(1, 6),
    PressedOnRelease              = bitLShift(1, 7),
    PressedOnDoubleClick          = bitLShift(1, 8),
    PressedOnDragDropHold         = bitLShift(1, 9),
    FlattenChildren               = bitLShift(1, 11),
    AllowOverlap                  = bitLShift(1, 12),
    AlignTextBaseLine             = bitLShift(1, 15),
    NoKeyModsAllowed              = bitLShift(1, 16),
    NoHoldingActiveId             = bitLShift(1, 17),
    NoNavFocus                    = bitLShift(1, 18),
    NoHoveredOnFocus              = bitLShift(1, 19),
    NoSetKeyOwner                 = bitLShift(1, 20),
    NoTestKeyOwner                = bitLShift(1, 21),
    NoFocus                       = bitLShift(1, 22)
}

ImGuiButtonFlags.MouseButtonMask_  = bitOr(ImGuiButtonFlags.MouseButtonLeft, ImGuiButtonFlags.MouseButtonRight, ImGuiButtonFlags.MouseButtonMiddle)
ImGuiButtonFlags.PressedOnMask_    = bitOr(ImGuiButtonFlags.PressedOnClick, ImGuiButtonFlags.PressedOnClickRelease, ImGuiButtonFlags.PressedOnClickReleaseAnywhere, ImGuiButtonFlags.PressedOnRelease, ImGuiButtonFlags.PressedOnDoubleClick, ImGuiButtonFlags.PressedOnDragDropHold)
ImGuiButtonFlags.PressedOnDefault_ = ImGuiButtonFlags.PressedOnClickRelease
ImGuiButtonFlags.NoKeyModifiers    = ImGuiButtonFlags.NoKeyModsAllowed

--- @enum ImGuiStyleVar
ImGuiStyleVar = {
    Alpha                       = 0,
    DisabledAlpha               = 1,
    WindowPadding               = 2,
    WindowRounding              = 3,
    WindowBorderSize            = 4,
    WindowMinSize               = 5,
    WindowTitleAlign            = 6,
    ChildRounding               = 7,
    ChildBorderSize             = 8,
    PopupRounding               = 9,
    PopupBorderSize             = 10,
    FramePadding                = 11,
    FrameRounding               = 12,
    FrameBorderSize             = 13,
    ItemSpacing                 = 14,
    ItemInnerSpacing            = 15,
    IndentSpacing               = 16,
    CellPadding                 = 17,
    ScrollbarSize               = 18,
    ScrollbarRounding           = 19,
    ScrollbarPadding            = 20,
    GrabMinSize                 = 21,
    GrabRounding                = 22,
    ImageRounding               = 23,
    ImageBorderSize             = 24,
    TabRounding                 = 25,
    TabBorderSize               = 26,
    TabMinWidthBase             = 27,
    TabMinWidthShrink           = 28,
    TabBarBorderSize            = 29,
    TabBarOverlineSize          = 30,
    TableAngledHeadersAngle     = 31,
    TableAngledHeadersTextAlign = 32,
    TreeLinesSize               = 33,
    TreeLinesRounding           = 34,
    MenuItemRounding            = 35,
    SelectableRounding          = 36,
    DragDropTargetRounding      = 37,
    ButtonTextAlign             = 38,
    SelectableTextAlign         = 39,
    SeparatorTextBorderSize     = 40,
    SeparatorTextAlign          = 41,
    SeparatorTextPadding        = 42,
    COUNT                       = 43
}

--- @enum ImGuiHoveredFlags
ImGuiHoveredFlags = {
    None                         = 0,
    ChildWindows                 = bitLShift(1, 0),
    RootWindow                   = bitLShift(1, 1),
    AnyWindow                    = bitLShift(1, 2),
    NoPopupHierarchy             = bitLShift(1, 3),
    DockHierarchy                = bitLShift(1, 4),
    AllowWhenBlockedByPopup      = bitLShift(1, 5),
    AllowWhenBlockedByActiveItem = bitLShift(1, 7),
    AllowWhenOverlappedByItem    = bitLShift(1, 8),
    AllowWhenOverlappedByWindow  = bitLShift(1, 9),
    AllowWhenDisabled            = bitLShift(1, 10),
    NoNavOverride                = bitLShift(1, 11),
    ForTooltip                   = bitLShift(1, 12),
    Stationary                   = bitLShift(1, 13),
    DelayNone                    = bitLShift(1, 14),
    DelayShort                   = bitLShift(1, 15),
    DelayNormal                  = bitLShift(1, 16),
    NoSharedDelay                = bitLShift(1, 17)
}

--- @enum ImGuiFocusedFlags
ImGuiFocusedFlags = {
    None             = 0,
    ChildWindows     = bitLShift(1, 0), -- Return true if any children of the window is focused
    RootWindow       = bitLShift(1, 1), -- Test from root window (top most parent of the current hierarchy)
    AnyWindow        = bitLShift(1, 2), -- Return true if any window is focused
    NoPopupHierarchy = bitLShift(1, 3), -- Do not consider popup hierarchy
    DockHierarchy    = bitLShift(1, 4), -- Consider docking hierarchy
}
ImGuiFocusedFlags.RootAndChildWindows = bitOr(ImGuiFocusedFlags.RootWindow, ImGuiFocusedFlags.ChildWindows)

ImGuiHoveredFlags.AllowWhenOverlapped = bitOr(ImGuiHoveredFlags.AllowWhenOverlappedByItem, ImGuiHoveredFlags.AllowWhenOverlappedByWindow)
ImGuiHoveredFlags.RectOnly            = bitOr(ImGuiHoveredFlags.AllowWhenBlockedByPopup, ImGuiHoveredFlags.AllowWhenBlockedByActiveItem, ImGuiHoveredFlags.AllowWhenOverlapped)
ImGuiHoveredFlags.RootAndChildWindows = bitOr(ImGuiHoveredFlags.RootWindow, ImGuiHoveredFlags.ChildWindows)
ImGuiHoveredFlags.DelayMask_ = bitOr(ImGuiHoveredFlags.DelayNone, ImGuiHoveredFlags.DelayShort, ImGuiHoveredFlags.DelayNormal, ImGuiHoveredFlags.NoSharedDelay)
ImGuiHoveredFlags.AllowedMaskForIsWindowHovered = bitOr(ImGuiHoveredFlags.ChildWindows, ImGuiHoveredFlags.RootWindow, ImGuiHoveredFlags.AnyWindow, ImGuiHoveredFlags.NoPopupHierarchy, ImGuiHoveredFlags.DockHierarchy, ImGuiHoveredFlags.AllowWhenBlockedByPopup, ImGuiHoveredFlags.AllowWhenBlockedByActiveItem, ImGuiHoveredFlags.ForTooltip, ImGuiHoveredFlags.Stationary)
ImGuiHoveredFlags.AllowedMaskForIsItemHovered = bitOr(ImGuiHoveredFlags.AllowWhenBlockedByPopup, ImGuiHoveredFlags.AllowWhenBlockedByActiveItem, ImGuiHoveredFlags.AllowWhenOverlapped, ImGuiHoveredFlags.AllowWhenDisabled, ImGuiHoveredFlags.NoNavOverride, ImGuiHoveredFlags.ForTooltip, ImGuiHoveredFlags.Stationary, ImGuiHoveredFlags.DelayMask_)

--- @enum ImGuiKey
ImGuiKey = {
    None = 0,

    NamedKey_BEGIN = 512,

    Tab        = 512,
    LeftArrow  = 513,
    RightArrow = 514,
    UpArrow    = 515,
    DownArrow  = 516,
    PageUp     = 517,
    PageDown   = 518,
    Home       = 519,
    End        = 520,
    Insert     = 521,
    Delete     = 522,
    Backspace  = 523,
    Space      = 524,
    Enter      = 525,
    Escape     = 526,
    LeftCtrl   = 527, LeftShift  = 528, LeftAlt  = 529, LeftSuper  = 530,
    RightCtrl  = 531, RightShift = 532, RightAlt = 533, RightSuper = 534,
    Menu       = 535,

    -- 1 ~ 9
    K0 = 536, K1 = 537, K2 = 538, K3 = 539, K4 = 540, K5 = 541, K6 = 542, K7 = 543, K8 = 544, K9 = 545,

    A = 546, B = 547, C = 548, D = 549, E = 550, F = 551, G = 552, H = 553, I = 554, J = 555,
    K = 556, L = 557, M = 558, N = 559, O = 560, P = 561, Q = 562, R = 563, S = 564, T = 565,
    U = 566, V = 567, W = 568, X = 569, Y = 570, Z = 571,

    F1  = 572, F2  = 573, F3  = 574, F4  = 575, F5  = 576, F6  = 577,
    F7  = 578, F8  = 579, F9  = 580, F10 = 581, F11 = 582, F12 = 583,
    F13 = 584, F14 = 585, F15 = 586, F16 = 587, F17 = 588, F18 = 589,
    F19 = 590, F20 = 591, F21 = 592, F22 = 593, F23 = 594, F24 = 595,

    Apostrophe = 596, Comma      = 597, Minus   = 598, Period      = 599, Slash = 600, Semicolon = 601, Equal = 602, LeftBracket = 603, Backslash = 604, RightBracket = 605, GraveAccent = 606,
    CapsLock   = 607, ScrollLock = 608, NumLock = 609, PrintScreen = 610, Pause = 611,

    Keypad0       = 612, Keypad1      = 613, Keypad2        = 614, Keypad3        = 615, Keypad4   = 616, Keypad5     = 617, Keypad6     = 618, Keypad7 = 619, Keypad8 = 620, Keypad9 = 621,
    KeypadDecimal = 622, KeypadDivide = 623, KeypadMultiply = 624, KeypadSubtract = 625, KeypadAdd = 626, KeypadEnter = 627, KeypadEqual = 628,

    AppBack        = 629,
    AppForward     = 630,
    Oem102         = 631,

    GamepadStart      = 632, GamepadBack        = 633,
    GamepadFaceLeft   = 634, GamepadFaceRight   = 635, GamepadFaceUp   = 636, GamepadFaceDown   = 637,
    GamepadDpadLeft   = 638, GamepadDpadRight   = 639, GamepadDpadUp   = 640, GamepadDpadDown   = 641,
    GamepadL1         = 642, GamepadR1          = 643,
    GamepadL2         = 644, GamepadR2          = 645,
    GamepadL3         = 646, GamepadR3          = 647,
    GamepadLStickLeft = 648, GamepadLStickRight = 649, GamepadLStickUp = 650, GamepadLStickDown = 651,
    GamepadRStickLeft = 652, GamepadRStickRight = 653, GamepadRStickUp = 654, GamepadRStickDown = 655,

    MouseLeft = 656, MouseRight = 657, MouseMiddle = 658, MouseX1 = 659, MouseX2 = 660, MouseWheelX = 661, MouseWheelY = 662,

    ReservedForModCtrl = 663, ReservedForModShift = 664, ReservedForModAlt = 665, ReservedForModSuper = 666,

    NamedKey_END = 667
}

ImGuiKey.NamedKey_COUNT = ImGuiKey.NamedKey_END - ImGuiKey.NamedKey_BEGIN

ImGuiMod_None  = 0
ImGuiMod_Ctrl  = bitLShift(1, 12)
ImGuiMod_Shift = bitLShift(1, 13)
ImGuiMod_Alt   = bitLShift(1, 14)
ImGuiMod_Super = bitLShift(1, 15)
ImGuiMod_Mask_ = 0xF000

--- @enum ImGuiCol
ImGuiCol = {
    Text                      = 0,
    TextDisabled              = 1,
    WindowBg                  = 2,
    ChildBg                   = 3,
    PopupBg                   = 4,
    Border                    = 5,
    BorderShadow              = 6,
    FrameBg                   = 7,
    FrameBgHovered            = 8,
    FrameBgActive             = 9,
    TitleBg                   = 10,
    TitleBgActive             = 11,
    TitleBgCollapsed          = 12,
    MenuBarBg                 = 13,
    ScrollbarBg               = 14,
    ScrollbarGrab             = 15,
    ScrollbarGrabHovered      = 16,
    ScrollbarGrabActive       = 17,
    CheckMark                 = 18,
    CheckboxSelectedBg        = 19,
    SliderGrab                = 20,
    SliderGrabActive          = 21,
    Button                    = 22,
    ButtonHovered             = 23,
    ButtonActive              = 24,
    Header                    = 25,
    HeaderHovered             = 26,
    HeaderActive              = 27,
    Separator                 = 28,
    SeparatorHovered          = 29,
    SeparatorActive           = 30,
    ResizeGrip                = 31,
    ResizeGripHovered         = 32,
    ResizeGripActive          = 33,
    InputTextCursor           = 34,
    TabHovered                = 35,
    Tab                       = 36,
    TabSelected               = 37,
    TabSelectedOverline       = 38,
    TabDimmed                 = 39,
    TabDimmedSelected         = 40,
    TabDimmedSelectedOverline = 41,
    DockingPreview            = 42,
    DockingEmptyBg            = 43,
    PlotLines                 = 44,
    PlotLinesHovered          = 45,
    PlotHistogram             = 46,
    PlotHistogramHovered      = 47,
    TableHeaderBg             = 48,
    TableBorderStrong         = 49,
    TableBorderLight          = 50,
    TableRowBg                = 51,
    TableRowBgAlt             = 52,
    TextLink                  = 53,
    TextSelectedBg            = 54,
    TreeLines                 = 55,
    DragDropTarget            = 56,
    DragDropTargetBg          = 57,
    UnsavedMarker             = 58,
    NavCursor                 = 59,
    NavWindowingHighlight     = 60,
    NavWindowingDimBg         = 61,
    ModalWindowDimBg          = 62,
    COUNT = 63
}

--- @enum ImGuiBackendFlags
ImGuiBackendFlags = {
    None                  = 0,
    HasGamepad            = bitLShift(1, 0),
    HasMouseCursors       = bitLShift(1, 1),
    HasSetMousePos        = bitLShift(1, 2),
    RendererHasVtxOffset  = bitLShift(1, 3),
    RendererHasTextures   = bitLShift(1, 4),

    -- [BETA] Multi-Viewports
    RendererHasViewports    = bitLShift(1, 10),
    PlatformHasViewports    = bitLShift(1, 11),
    HasMouseHoveredViewport = bitLShift(1, 12),
    HasParentViewport       = bitLShift(1, 13)
}

--- @enum ImGuiDragDropFlags
ImGuiDragDropFlags = {
    None                     = 0,
    SourceNoPreviewTooltip   = bitLShift(1, 0),
    SourceNoDisableHover     = bitLShift(1, 1),
    SourceNoHoldToOpenOthers = bitLShift(1, 2),
    SourceAllowNullID        = bitLShift(1, 3),
    SourceExtern             = bitLShift(1, 4),
    PayloadAutoExpire        = bitLShift(1, 5),
    PayloadNoCrossContext    = bitLShift(1, 6),
    PayloadNoCrossProcess    = bitLShift(1, 7),
    AcceptBeforeDelivery     = bitLShift(1, 10),
    AcceptNoDrawDefaultRect  = bitLShift(1, 11),
    AcceptNoPreviewTooltip   = bitLShift(1, 12),
    AcceptDrawAsHovered      = bitLShift(1, 13)
}

ImGuiDragDropFlags.AcceptPeekOnly = bitOr(ImGuiDragDropFlags.AcceptBeforeDelivery, ImGuiDragDropFlags.AcceptNoDrawDefaultRect)

IM_COL32_R_SHIFT = 0
IM_COL32_G_SHIFT = 8
IM_COL32_B_SHIFT = 16
IM_COL32_A_SHIFT = 24
IM_COL32_A_MASK  = 0xFF000000

--- @param R ImU32
--- @param G ImU32
--- @param B ImU32
--- @param A ImU32
IM_COL32             = function(R, G, B, A) return (bitOr(bitLShift(A, IM_COL32_A_SHIFT), bitLShift(B, IM_COL32_B_SHIFT), bitLShift(G, IM_COL32_G_SHIFT), bitLShift(R, IM_COL32_R_SHIFT))) end
IM_COL32_WHITE       = IM_COL32(255, 255, 255, 255)
IM_COL32_BLACK       = IM_COL32(0, 0, 0, 255)
IM_COL32_BLACK_TRANS = IM_COL32(0, 0, 0, 0)

--- @enum ImGuiPopupFlags
ImGuiPopupFlags = {
    None                    = 0,
    MouseButtonLeft         = bitLShift(1, 2),
    MouseButtonRight        = bitLShift(2, 2),
    MouseButtonMiddle       = bitLShift(3, 2),
    NoReopen                = bitLShift(1, 5),
    NoOpenOverExistingPopup = bitLShift(1, 7),
    NoOpenOverItems         = bitLShift(1, 8),
    AnyPopupId              = bitLShift(1, 10),
    AnyPopupLevel           = bitLShift(1, 11)
}

ImGuiPopupFlags.AnyPopup          = bitOr(ImGuiPopupFlags.AnyPopupId, ImGuiPopupFlags.AnyPopupLevel)
ImGuiPopupFlags.MouseButtonShift_ = 2
ImGuiPopupFlags.MouseButtonMask_  = 0x0C
ImGuiPopupFlags.InvalidMask_      = 0x03

--- @enum ImGuiComboFlags
ImGuiComboFlags = {
    None            = 0,
    PopupAlignLeft  = bitLShift(1, 0),
    HeightSmall     = bitLShift(1, 1),
    HeightRegular   = bitLShift(1, 2),
    HeightLarge     = bitLShift(1, 3),
    HeightLargest   = bitLShift(1, 4),
    NoArrowButton   = bitLShift(1, 5),
    NoPreview       = bitLShift(1, 6),
    WidthFitPreview = bitLShift(1, 7)
}

ImGuiComboFlags.HeightMask_ = bitOr(ImGuiComboFlags.HeightSmall, ImGuiComboFlags.HeightRegular, ImGuiComboFlags.HeightLarge, ImGuiComboFlags.HeightLargest)
ImGuiComboFlags.CustomPreview = bitLShift(1, 20)

--- @enum ImGuiSelectableFlags
ImGuiSelectableFlags = {
    None              = 0,
    NoAutoClosePopups = bitLShift(1, 0),
    SpanAllColumns    = bitLShift(1, 1),
    AllowDoubleClick  = bitLShift(1, 2),
    Disabled          = bitLShift(1, 3),
    AllowOverlap      = bitLShift(1, 4),
    Highlight         = bitLShift(1, 5),
    SelectOnNav       = bitLShift(1, 6),

    NoHoldingActiveID    = bitLShift(1, 20),
    SelectOnClick        = bitLShift(1, 22),
    SelectOnRelease      = bitLShift(1, 23),
    SpanAvailWidth       = bitLShift(1, 24),
    SetNavIdOnHover      = bitLShift(1, 25),
    NoPadWithHalfSpacing = bitLShift(1, 26),
    NoSetKeyOwner        = bitLShift(1, 27),
}

--- @enum ImGuiColorEditFlags
ImGuiColorEditFlags = {
    None           = 0,
    NoAlpha        = bitLShift(1, 1),
    NoPicker       = bitLShift(1, 2),
    NoOptions      = bitLShift(1, 3),
    NoSmallPreview = bitLShift(1, 4),
    NoInputs       = bitLShift(1, 5),
    NoTooltip      = bitLShift(1, 6),
    NoLabel        = bitLShift(1, 7),
    NoSidePreview  = bitLShift(1, 8),
    NoDragDrop     = bitLShift(1, 9),
    NoBorder       = bitLShift(1, 10),
    NoColorMarkers = bitLShift(1, 11),

    -- Alpha preview
    AlphaOpaque      = bitLShift(1, 12),
    AlphaNoBg        = bitLShift(1, 13),
    AlphaPreviewHalf = bitLShift(1, 14),

    -- User Options (right-click on widget to change some of them)
    AlphaBar       = bitLShift(1, 18),
    HDR            = bitLShift(1, 19),
    DisplayRGB     = bitLShift(1, 20),
    DisplayHSV     = bitLShift(1, 21),
    DisplayHex     = bitLShift(1, 22),
    Uint8          = bitLShift(1, 23),
    Float          = bitLShift(1, 24),
    PickerHueBar   = bitLShift(1, 25),
    PickerHueWheel = bitLShift(1, 26),
    PickerNoRotate = bitLShift(1, 27),
    InputRGB       = bitLShift(1, 28),
    InputHSV       = bitLShift(1, 29)
}

ImGuiColorEditFlags.DefaultOptions_ = bitOr(ImGuiColorEditFlags.Uint8, ImGuiColorEditFlags.DisplayRGB, ImGuiColorEditFlags.InputRGB, ImGuiColorEditFlags.PickerHueBar)
ImGuiColorEditFlags.AlphaMask_ = bitOr( ImGuiColorEditFlags.NoAlpha, ImGuiColorEditFlags.AlphaOpaque, ImGuiColorEditFlags.AlphaNoBg, ImGuiColorEditFlags.AlphaPreviewHalf )
ImGuiColorEditFlags.DisplayMask_ = bitOr( ImGuiColorEditFlags.DisplayRGB, ImGuiColorEditFlags.DisplayHSV, ImGuiColorEditFlags.DisplayHex )
ImGuiColorEditFlags.DataTypeMask_ = bitOr( ImGuiColorEditFlags.Uint8, ImGuiColorEditFlags.Float )
ImGuiColorEditFlags.PickerMask_ = bitOr( ImGuiColorEditFlags.PickerHueWheel, ImGuiColorEditFlags.PickerHueBar )
ImGuiColorEditFlags.InputMask_ = bitOr( ImGuiColorEditFlags.InputRGB, ImGuiColorEditFlags.InputHSV )

--- @enum ImGuiSliderFlags
ImGuiSliderFlags = {
    None            = 0,
    Logarithmic     = bitLShift(1, 5),
    NoRoundToFormat = bitLShift(1, 6),
    NoInput         = bitLShift(1, 7),
    WrapAround      = bitLShift(1, 8),
    ClampOnInput    = bitLShift(1, 9),
    ClampZeroRange  = bitLShift(1, 10),
    NoSpeedTweaks   = bitLShift(1, 11),
    ColorMarkers    = bitLShift(1, 12),
    InvalidMask_    = 0x7000000F,
}

ImGuiSliderFlags.AlwaysClamp = bitOr(ImGuiSliderFlags.ClampOnInput, ImGuiSliderFlags.ClampZeroRange)

ImGuiSliderFlags.Vertical = bitLShift(1, 20)
ImGuiSliderFlags.ReadOnly = bitLShift(1, 21)

--- @class ImGuiWindowClass
--- @field ClassId                    ImGuiID
--- @field ParentViewportId           ImGuiID
--- @field FocusRouteParentWindowId   ImGuiID
--- @field ViewportFlagsOverrideSet   ImGuiViewportFlags
--- @field ViewportFlagsOverrideClear ImGuiViewportFlags

--- @return ImGuiWindowClass
--- @nodiscard
function ImGuiWindowClass()
    return {
        ClassId                    = 0,
        ParentViewportId           = 0xFFFFFFFF,
        FocusRouteParentWindowId   = 0,
        ViewportFlagsOverrideSet   = 0,
        ViewportFlagsOverrideClear = 0,

        TabItemFlagsOverrideSet  = 0,
        DockNodeFlagsOverrideSet = 0,
        DockingAlwaysTabBar      = false,
        DockingAllowUnclassed    = true
    }
end

--- @enum ImGuiInputTextFlags
ImGuiInputTextFlags = {
    None = 0,

    -- Basic filters (also see ImGuiInputTextFlags.CallbackCharFilter)
    CharsDecimal     = bitLShift(1, 0),
    CharsHexadecimal = bitLShift(1, 1),
    CharsScientific  = bitLShift(1, 2),
    CharsUppercase   = bitLShift(1, 3),
    CharsNoBlank     = bitLShift(1, 4),

    -- Inputs
    AllowTabInput       = bitLShift(1, 5),
    EnterReturnsTrue    = bitLShift(1, 6),
    EscapeClearsAll     = bitLShift(1, 7),
    CtrlEnterForNewLine = bitLShift(1, 8),

    -- Other options
    ReadOnly           = bitLShift(1, 9),
    Password           = bitLShift(1, 10),
    AlwaysOverwrite    = bitLShift(1, 11),
    AutoSelectAll      = bitLShift(1, 12),
    ParseEmptyRefVal   = bitLShift(1, 13),
    DisplayEmptyRefVal = bitLShift(1, 14),
    NoHorizontalScroll = bitLShift(1, 15),
    NoUndoRedo         = bitLShift(1, 16),

    -- Elide display / Alignment
    ElideLeft = bitLShift(1, 17),

    -- Callback features
    CallbackCompletion = bitLShift(1, 18),
    CallbackHistory    = bitLShift(1, 19),
    CallbackAlways     = bitLShift(1, 20),
    CallbackCharFilter = bitLShift(1, 21),
    CallbackResize     = bitLShift(1, 22),
    CallbackEdit       = bitLShift(1, 23),

    -- Multi-line Word-Wrapping [BETA]
    WordWrap = bitLShift(1, 24),

    -- [Internal]
    Multiline            = bitLShift(1, 26),
    TempInput            = bitLShift(1, 27),
    LocalizeDecimalPoint = bitLShift(1, 28),
}

--- @class ImGuiInputTextCallbackData

--- @return ImGuiInputTextCallbackData
-- Buf is a 1-based zero-terminated byte table; positions (CursorPos, pos...) are 0-based byte offsets like upstream.
MT.ImGuiInputTextCallbackData = {}
MT.ImGuiInputTextCallbackData.__index = MT.ImGuiInputTextCallbackData
function ImGuiInputTextCallbackData()
    return setmetatable({}, MT.ImGuiInputTextCallbackData)
end

function MT.ImGuiInputTextCallbackData:DeleteChars(pos, bytes_count)
    IM_ASSERT(pos + bytes_count <= self.BufTextLen)
    local buf = self.Buf
    local n = self.BufTextLen - bytes_count - pos + 1 -- includes zero terminator
    for i = 1, n do buf[pos + i] = buf[pos + bytes_count + i] end

    if self.CursorPos >= pos + bytes_count then
        self.CursorPos = self.CursorPos - bytes_count
    elseif self.CursorPos >= pos then
        self.CursorPos = pos
    end
    self.SelectionStart = self.CursorPos; self.SelectionEnd = self.CursorPos
    self.BufDirty = true
    self.BufTextLen = self.BufTextLen - bytes_count
end

--- @param new_text string
function MT.ImGuiInputTextCallbackData:InsertChars(pos, new_text)
    local new_text_len = #new_text
    if new_text_len == 0 then return end
    local is_resizable = bit32.band(self.Flags, ImGuiInputTextFlags.CallbackResize) ~= 0
    -- We support partial insertion
    local avail = self.BufSize - 1 - self.BufTextLen
    if not is_resizable and new_text_len > avail then
        new_text_len = avail -- ponytail: truncates by bytes, not to the closest UTF-8 codepoint
    end
    if new_text_len <= 0 then return end
    -- ponytail: CallbackResize buffer growth not supported, text is truncated at BufSize instead
    if self.BufTextLen + new_text_len + 1 > self.BufSize then
        new_text_len = self.BufSize - 1 - self.BufTextLen
        if new_text_len <= 0 then return end
    end

    local buf = self.Buf
    for i = self.BufTextLen, pos + 1, -1 do buf[i + new_text_len] = buf[i] end
    for i = 1, new_text_len do buf[pos + i] = string.byte(new_text, i) end
    buf[self.BufTextLen + new_text_len + 1] = 0

    self.BufDirty = true
    self.BufTextLen = self.BufTextLen + new_text_len
    if self.CursorPos >= pos then
        self.CursorPos = self.CursorPos + new_text_len
    end
    self.SelectionStart = self.CursorPos; self.SelectionEnd = self.CursorPos
end

function MT.ImGuiInputTextCallbackData:SelectAll() self.SelectionStart = 0; self.SelectionEnd = self.BufTextLen end
function MT.ImGuiInputTextCallbackData:ClearSelection() self.SelectionStart = self.BufTextLen; self.SelectionEnd = self.BufTextLen end
function MT.ImGuiInputTextCallbackData:HasSelection() return self.SelectionStart ~= self.SelectionEnd end

--- @alias ImGuiInputTextCallback fun(data: ImGuiInputTextCallbackData)

--- @alias ImGuiMemAllocFunc fun(T: function, start_idx: int, end_idx: int, userdata: any): table
--- @alias ImGuiMemFreeFunc fun(owner: table, field: string, userdata: any)

--- @alias ImDrawCallback fun(parent_list: ImDrawList, cmd: ImDrawCmd)

--- @enum ImGuiTreeNodeFlags
ImGuiTreeNodeFlags = {
    None                 = 0,
    Selected             = bitLShift(1, 0),
    Framed               = bitLShift(1, 1),
    AllowOverlap         = bitLShift(1, 2),
    NoTreePushOnOpen     = bitLShift(1, 3),
    NoAutoOpenOnLog      = bitLShift(1, 4),
    DefaultOpen          = bitLShift(1, 5),
    OpenOnDoubleClick    = bitLShift(1, 6),
    OpenOnArrow          = bitLShift(1, 7),
    Leaf                 = bitLShift(1, 8),
    Bullet               = bitLShift(1, 9),
    FramePadding         = bitLShift(1, 10),
    SpanAvailWidth       = bitLShift(1, 11),
    SpanFullWidth        = bitLShift(1, 12),
    SpanLabelWidth       = bitLShift(1, 13),
    SpanAllColumns       = bitLShift(1, 14),
    LabelSpanAllColumns  = bitLShift(1, 15),
    NavLeftJumpsToParent = bitLShift(1, 17),
    DrawLinesNone        = bitLShift(1, 18),
    DrawLinesFull        = bitLShift(1, 19),
    DrawLinesToNodes     = bitLShift(1, 20),

    NoNavFocus                 = bitLShift(1, 27),
    ClipLabelForTrailingButton = bitLShift(1, 28),
    UpsideDownArrow            = bitLShift(1, 29),
}

ImGuiTreeNodeFlags.CollapsingHeader = bitOr(ImGuiTreeNodeFlags.Framed, ImGuiTreeNodeFlags.NoTreePushOnOpen, ImGuiTreeNodeFlags.NoAutoOpenOnLog)

ImGuiTreeNodeFlags.OpenOnMask_ = bitOr(ImGuiTreeNodeFlags.OpenOnDoubleClick, ImGuiTreeNodeFlags.OpenOnArrow)
ImGuiTreeNodeFlags.DrawLinesMask_ = bitOr(ImGuiTreeNodeFlags.DrawLinesNone, ImGuiTreeNodeFlags.DrawLinesFull, ImGuiTreeNodeFlags.DrawLinesToNodes)

--- @enum ImGuiTableFlags
ImGuiTableFlags =
{
    None                       = 0,
    Resizable                  = bitLShift(1, 0),
    Reorderable                = bitLShift(1, 1),
    Hideable                   = bitLShift(1, 2),
    Sortable                   = bitLShift(1, 3),
    NoSavedSettings            = bitLShift(1, 4),
    ContextMenuInBody          = bitLShift(1, 5),
    RowBg                      = bitLShift(1, 6),
    BordersInnerH              = bitLShift(1, 7),
    BordersOuterH              = bitLShift(1, 8),
    BordersInnerV              = bitLShift(1, 9),
    BordersOuterV              = bitLShift(1, 10),
    NoBordersInBody            = bitLShift(1, 11),
    NoBordersInBodyUntilResize = bitLShift(1, 12),
    SizingFixedFit             = bitLShift(1, 13),
    SizingFixedSame            = bitLShift(2, 13),
    SizingStretchProp          = bitLShift(3, 13),
    SizingStretchSame          = bitLShift(4, 13),
    NoHostExtendX              = bitLShift(1, 16),
    NoHostExtendY              = bitLShift(1, 17),
    NoKeepColumnsVisible       = bitLShift(1, 18),
    PreciseWidths              = bitLShift(1, 19),
    NoClip                     = bitLShift(1, 20),
    PadOuterX                  = bitLShift(1, 21),
    NoPadOuterX                = bitLShift(1, 22),
    NoPadInnerX                = bitLShift(1, 23),
    ScrollX                    = bitLShift(1, 24),
    ScrollY                    = bitLShift(1, 25),
    SortMulti                  = bitLShift(1, 26),
    SortTristate               = bitLShift(1, 27),
    HighlightHoveredColumn     = bitLShift(1, 28),
}
ImGuiTableFlags.BordersH     = bitOr(ImGuiTableFlags.BordersInnerH, ImGuiTableFlags.BordersOuterH)
ImGuiTableFlags.BordersV     = bitOr(ImGuiTableFlags.BordersInnerV, ImGuiTableFlags.BordersOuterV)
ImGuiTableFlags.BordersInner = bitOr(ImGuiTableFlags.BordersInnerV, ImGuiTableFlags.BordersInnerH)
ImGuiTableFlags.BordersOuter = bitOr(ImGuiTableFlags.BordersOuterV, ImGuiTableFlags.BordersOuterH)
ImGuiTableFlags.Borders      = bitOr(ImGuiTableFlags.BordersInner, ImGuiTableFlags.BordersOuter)
ImGuiTableFlags.SizingMask_  = bitOr(ImGuiTableFlags.SizingFixedFit, ImGuiTableFlags.SizingFixedSame, ImGuiTableFlags.SizingStretchProp, ImGuiTableFlags.SizingStretchSame)

--- @enum ImGuiTableColumnFlags
ImGuiTableColumnFlags =
{
    None                 = 0,
    Disabled             = bitLShift(1, 0),
    DefaultHide          = bitLShift(1, 1),
    DefaultSort          = bitLShift(1, 2),
    WidthStretch         = bitLShift(1, 3),
    WidthFixed           = bitLShift(1, 4),
    NoResize             = bitLShift(1, 5),
    NoReorder            = bitLShift(1, 6),
    NoHide               = bitLShift(1, 7),
    NoClip               = bitLShift(1, 8),
    NoSort               = bitLShift(1, 9),
    NoSortAscending      = bitLShift(1, 10),
    NoSortDescending     = bitLShift(1, 11),
    NoHeaderLabel        = bitLShift(1, 12),
    NoHeaderWidth        = bitLShift(1, 13),
    PreferSortAscending  = bitLShift(1, 14),
    PreferSortDescending = bitLShift(1, 15),
    IndentEnable         = bitLShift(1, 16),
    IndentDisable        = bitLShift(1, 17),
    AngledHeader         = bitLShift(1, 18),

    IsEnabled            = bitLShift(1, 24),
    IsVisible            = bitLShift(1, 25),
    IsSorted             = bitLShift(1, 26),
    IsHovered            = bitLShift(1, 27),

    NoDirectResize_      = bitLShift(1, 30),
}
ImGuiTableColumnFlags.WidthMask_  = bitOr(ImGuiTableColumnFlags.WidthStretch, ImGuiTableColumnFlags.WidthFixed)
ImGuiTableColumnFlags.IndentMask_ = bitOr(ImGuiTableColumnFlags.IndentEnable, ImGuiTableColumnFlags.IndentDisable)
ImGuiTableColumnFlags.StatusMask_ = bitOr(ImGuiTableColumnFlags.IsEnabled, ImGuiTableColumnFlags.IsVisible, ImGuiTableColumnFlags.IsSorted, ImGuiTableColumnFlags.IsHovered)

--- @enum ImGuiTableRowFlags
ImGuiTableRowFlags = { None = 0, Headers = bitLShift(1, 0) }

--- @enum ImGuiTableBgTarget
ImGuiTableBgTarget = { None = 0, RowBg0 = 1, RowBg1 = 2, CellBg = 3 }

--- @enum ImGuiSortDirection
ImGuiSortDirection = { None = 0, Ascending = 1, Descending = 2 }



--- @class ImGuiPayload
--- Drag and drop payload. `Data` is any Lua value (C++ stores raw bytes); `DataSize` kept for API parity.
local IM_PAYLOAD = {}
IM_PAYLOAD.__index = IM_PAYLOAD
function IM_PAYLOAD:Clear() ImGuiPayload_Clear(self) end
function IM_PAYLOAD:IsDataType(t) return ImGuiPayload_IsDataType(self, t) end
function IM_PAYLOAD:IsPreview() return self.Preview end
function IM_PAYLOAD:IsDelivery() return self.Delivery end
function ImGuiPayload()
    return setmetatable({ Data = nil, DataSize = 0, SourceId = 0, SourceParentId = 0, DataFrameCount = -1, DataType = "", Preview = false, Delivery = false }, IM_PAYLOAD)
end
function ImGuiPayload_Clear(p) p.SourceId = 0; p.SourceParentId = 0; p.Data = nil; p.DataSize = 0; p.DataType = ""; p.DataFrameCount = -1; p.Preview = false; p.Delivery = false end
function ImGuiPayload_IsDataType(p, t) return p.DataFrameCount ~= -1 and p.DataType == t end
function ImGuiPayload_IsPreview(p) return p.Preview end
function ImGuiPayload_IsDelivery(p) return p.Delivery end

--- @class ImGuiTextBuffer  # string builder: Buf is a list of string chunks
local ImGuiTextBufferMT = {}
ImGuiTextBufferMT.__index = ImGuiTextBufferMT
function ImGuiTextBuffer() return setmetatable({ Buf = {} }, ImGuiTextBufferMT) end
function ImGuiTextBufferMT:clear() self.Buf = {} end
function ImGuiTextBufferMT:empty() return #self.Buf == 0 end
function ImGuiTextBufferMT:append(str) self.Buf[#self.Buf + 1] = str end
function ImGuiTextBufferMT:appendf(fmt, ...) self.Buf[#self.Buf + 1] = string.format(fmt, ...) end
function ImGuiTextBufferMT:c_str() return table.concat(self.Buf) end
function ImGuiTextBufferMT:size() return #self:c_str() end

--- @class ImGuiSettingsHandler
--- Fns take (ctx, handler, ...) like upstream. ReadOpenFn(ctx, handler, name) returns entry; ReadLineFn(ctx, handler, entry, line);
--- WriteAllFn(ctx, handler, buf: ImGuiTextBuffer)
function ImGuiSettingsHandler()
    return { TypeName = nil, TypeHash = 0, ClearAllFn = nil, ReadInitFn = nil, ReadOpenFn = nil, ReadLineFn = nil,
             ApplyAllFn = nil, WriteAllFn = nil, CleanupFn = nil, UserData = nil }
end

return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imgui_impl_roblox.lua'] = function()
--- ImGui Backend for Roblox
---  - Renderer: exact software rasterizer (1:1 with imgui's triangles) into 256x256 EditableImage tiles at native
---    screen resolution; only tiles whose content changed are redrawn/uploaded (see RenderDrawData).
---  - Platform: UserInputService
---  - Files: an in-memory file system (VFS), pre-filled with the fonts from imgui_impl_roblox_fonts.lua
--- Requires "Allow Mesh / Image APIs" (EditableImage) in game settings.

local UserInputService = game:GetService("UserInputService")
local Players          = game:GetService("Players")
local AssetService     = game:GetService("AssetService")

local floor, ceil, min, max = math.floor, math.ceil, math.min, math.max
local readu8, readu32, writeu32, readstring = buffer.readu8, buffer.readu32, buffer.writeu32, buffer.readstring
local band, rshift = bit32.band, bit32.rshift

local ImGui_ImplRoblox_GetBackendData
local ImGui_ImplRoblox_UpdateTexture
local ImGui_ImplRoblox_RenderDrawData
local ImGui_ImplRoblox_Shutdown

local KEY_MAP = {} -- Enum.KeyCode -> ImGuiKey
do
    local names = {
        Return = "Enter", Escape = "Escape", Backspace = "Backspace", Tab = "Tab", Space = "Space", KeypadEnter = "KeypadEnter",
        Up = "UpArrow", Down = "DownArrow", Left = "LeftArrow", Right = "RightArrow",
        Home = "Home", End = "End", PageUp = "PageUp", PageDown = "PageDown", Insert = "Insert", Delete = "Delete",
        LeftControl = "LeftCtrl", RightControl = "RightCtrl", LeftShift = "LeftShift", RightShift = "RightShift",
        LeftAlt = "LeftAlt", RightAlt = "RightAlt", LeftSuper = "LeftSuper", RightSuper = "RightSuper",
        Quote = "Apostrophe", Comma = "Comma", Minus = "Minus", Period = "Period", Slash = "Slash", Semicolon = "Semicolon",
        Equals = "Equal", LeftBracket = "LeftBracket", BackSlash = "Backslash", RightBracket = "RightBracket", Backquote = "GraveAccent",
        CapsLock = "CapsLock",
        KeypadPeriod = "KeypadDecimal", KeypadDivide = "KeypadDivide", KeypadMultiply = "KeypadMultiply",
        KeypadMinus = "KeypadSubtract", KeypadPlus = "KeypadAdd", KeypadEquals = "KeypadEqual",
    }
    local digits = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }
    for i = 0, 9 do
        names[digits[i + 1]] = "K" .. i
        names["Keypad" .. digits[i + 1]] = "Keypad" .. i
    end
    for i = 1, 12 do names["F" .. i] = "F" .. i end
    for c in ("ABCDEFGHIJKLMNOPQRSTUVWXYZ"):gmatch(".") do names[c] = c end

    for rbx_name, imgui_name in pairs(names) do
        KEY_MAP[Enum.KeyCode[rbx_name]] = ImGuiKey[imgui_name]
    end
end

-- Roblox has no "text input" event, so characters come from KeyCode.Value (ASCII for printable keys) + a US layout shift table.
local SHIFTED = {
    ["1"] = "!", ["2"] = "@", ["3"] = "#", ["4"] = "$", ["5"] = "%", ["6"] = "^", ["7"] = "&", ["8"] = "*", ["9"] = "(", ["0"] = ")",
    ["-"] = "_", ["="] = "+", ["["] = "{", ["]"] = "}", ["\\"] = "|", [";"] = ":", ["'"] = "\"", [","] = "<", ["."] = ">", ["/"] = "?", ["`"] = "~",
}

local MOUSE_BUTTONS = {
    [Enum.UserInputType.MouseButton1] = 0, -- ImGuiMouseButton.Left
    [Enum.UserInputType.MouseButton2] = 1, -- ImGuiMouseButton.Right
    [Enum.UserInputType.MouseButton3] = 2, -- ImGuiMouseButton.Middle
}

--- @return boolean ctrl, boolean shift, boolean alt
local function ImGui_ImplRoblox_UpdateKeyModifiers()
    local io = ImGui.GetIO()
    local K = Enum.KeyCode
    local ctrl  = UserInputService:IsKeyDown(K.LeftControl) or UserInputService:IsKeyDown(K.RightControl)
    local shift = UserInputService:IsKeyDown(K.LeftShift) or UserInputService:IsKeyDown(K.RightShift)
    local alt   = UserInputService:IsKeyDown(K.LeftAlt) or UserInputService:IsKeyDown(K.RightAlt)
    io:AddKeyEvent(ImGuiMod_Ctrl, ctrl)
    io:AddKeyEvent(ImGuiMod_Shift, shift)
    io:AddKeyEvent(ImGuiMod_Alt, alt)
    io:AddKeyEvent(ImGuiMod_Super, UserInputService:IsKeyDown(K.LeftSuper) or UserInputService:IsKeyDown(K.RightSuper))
    return ctrl, shift, alt
end

--- @return table?
function ImGui_ImplRoblox_GetBackendData()
    return ImGui.GetCurrentContext() and ImGui.GetIO().BackendPlatformUserData or nil
end

local function ImGui_ImplRoblox_UpdateMonitors(w, h)
    local platform_io = ImGui.GetPlatformIO()
    platform_io.Monitors:resize(0)

    local imgui_monitor = ImGuiPlatformMonitor()
    ImVec2_Copy(imgui_monitor.MainSize, ImVec2(w, h))
    ImVec2_Copy(imgui_monitor.WorkSize, ImVec2(w, h))

    platform_io.Monitors:push_back(imgui_monitor)
end

---------------------------------------------------------
-- PLATFORM DATA & CALLBACKS
---------------------------------------------------------

-- Games can't touch the OS clipboard, so copy/paste only works inside ImGui
local clipboard = ""
local function ImGui_ImplRoblox_PlatformSetClipboardText(ctx, text) clipboard = text end
local function ImGui_ImplRoblox_PlatformGetClipboardText(ctx) return clipboard end

---------------------------------------------------------
-- FILE SYSTEM (in-memory, Roblox has no file access)
---------------------------------------------------------

local VFS = {} -- path -> string of raw bytes

--- Registers a file so ImGui can load it, e.g. ImGui_ImplRoblox.AddFile("fonts/MyFont.ttf", bytes)
--- then io.Fonts:AddFontFromFileTTF("fonts/MyFont.ttf", 16)
local function ImGui_ImplRoblox_AddFile(path, bytes) VFS[path] = bytes end

for path, hex in pairs(IM_INCLUDE("imgui_impl_roblox_fonts.lua")) do
    VFS[path] = hex:gsub("%s", ""):gsub("%x%x", function(h) return string.char(tonumber(h, 16)) end)
end

function ImStd.ImFileOpen(filename, mode)
    local data = VFS[filename]
    return data and { Data = data, Pos = 0 } or nil
end

function ImStd.ImFileClose(f) end

function ImStd.ImFileGetSize(f) return #f.Data end

function ImStd.ImFileRead(f, data, count)
    local s, pos = f.Data, f.Pos
    count = min(count, #s - pos)
    for i = 1, count do data[i] = string.byte(s, pos + i) end
    f.Pos = pos + count
    return count
end

function ImStd.ImFileLoadToMemory(filename, mode)
    local f = ImStd.ImFileOpen(filename, mode)
    if not f or #f.Data == 0 then return end
    local file_data = {}
    local size = ImStd.ImFileRead(f, file_data, #f.Data)
    return file_data, size
end

---------------------------------------------------------
-- TEXTURE MANAGEMENT
---------------------------------------------------------

-- Copies a region of ImTextureData pixels (1-based byte table) into our RGBA8 buffer
local function CopyTexturePixels(tex, dst, x, y, w, h)
    local bpp, tex_w = tex.BytesPerPixel, tex.Width
    for row = 0, h - 1 do
        local src, src_base = tex:GetPixelsAt(x, y + row)
        local dst_off = ((y + row) * tex_w + x) * 4
        if bpp == 4 then
            for i = 0, w - 1 do
                local s = src_base + i * 4
                writeu32(dst, dst_off + i * 4, src[s] + src[s + 1] * 256 + src[s + 2] * 65536 + src[s + 3] * 16777216)
            end
        else -- Alpha8: white with alpha
            for i = 0, w - 1 do
                writeu32(dst, dst_off + i * 4, 16777215 + src[src_base + i] * 16777216)
            end
        end
    end
end

function ImGui_ImplRoblox_UpdateTexture(tex)
    local bd = ImGui_ImplRoblox_GetBackendData()
    if tex.Status == ImTextureStatus.WantCreate then
        local t = { Buffer = buffer.create(tex.Width * tex.Height * 4), Width = tex.Width, Height = tex.Height }
        CopyTexturePixels(tex, t.Buffer, 0, 0, tex.Width, tex.Height)

        bd.TextureCount = bd.TextureCount + 1
        bd.Textures[bd.TextureCount] = t
        tex.BackendUserData = bd.TextureCount
        tex:SetTexID(bd.TextureCount)
        tex:SetStatus(ImTextureStatus.OK)
    elseif tex.Status == ImTextureStatus.WantUpdates then
        local t = bd.Textures[tex.BackendUserData]
        IM_ASSERT(t ~= nil)
        for _, r in tex.Updates:iter() do
            CopyTexturePixels(tex, t.Buffer, r.x, r.y, r.w, r.h)
        end
        tex:SetStatus(ImTextureStatus.OK)
    elseif tex.Status == ImTextureStatus.WantDestroy then
        if tex.BackendUserData then
            bd.Textures[tex.BackendUserData] = nil
            tex.BackendUserData = nil
        end
        tex:SetTexID(ImTextureID_Invalid)
        tex:SetStatus(ImTextureStatus.Destroyed)
    end
end

---------------------------------------------------------
-- RENDERING (software rasterizer into tile buffers)
---------------------------------------------------------
-- Buffer layout: 4 bytes per pixel, R G B A, row-major, 0-based offsets. ImU32 colours are already R | G<<8 | B<<16 | A<<24.
-- Blending is non-premultiplied "over" with a transparent (alpha 0) background, so the game stays visible behind ImGui.

local buf, buf_w -- buffer/width of the tile being drawn
local TILE_SIZE -- Vector2, set below

-- Blends one pixel (r, g, b, a are 0..255). One u32 read/write, one division in the general case.
-- FillSpan below inlines the same math with per-span constants - keep the two in sync.
@native
local function BlendPixel(o, r, g, b, a)
    if a >= 255 then
        writeu32(buf, o, floor(r + 0.5) + floor(g + 0.5) * 256 + floor(b + 0.5) * 65536 + 4278190080)
        return
    end
    if a <= 0 then return end
    local d = readu32(buf, o)
    local da = rshift(d, 24)
    if da == 0 then
        writeu32(buf, o, floor(r + 0.5) + floor(g + 0.5) * 256 + floor(b + 0.5) * 65536 + floor(a + 0.5) * 16777216)
        return
    end
    local sa = a / 255
    local dr, dg, db = band(d, 255), band(rshift(d, 8), 255), band(rshift(d, 16), 255)
    if da == 255 then
        local ns = 1 - sa
        writeu32(buf, o, floor(r * sa + dr * ns + 0.5) + floor(g * sa + dg * ns + 0.5) * 256 + floor(b * sa + db * ns + 0.5) * 65536 + 4278190080)
    else
        local k = da * ((1 - sa) / 255)
        local oa = sa + k
        local inv = 1 / oa
        writeu32(buf, o, floor((r * sa + dr * k) * inv + 0.5) + floor((g * sa + dg * k) * inv + 0.5) * 256
            + floor((b * sa + db * k) * inv + 0.5) * 65536 + floor(oa * 255 + 0.5) * 16777216)
    end
end

-- Fills pixels [x0, x1) of row y with one colour
@native
local function FillSpan(y, x0, x1, r, g, b, a)
    if a <= 0 then return end
    local o0 = (y * buf_w + x0) * 4
    local o1 = o0 + (x1 - x0 - 1) * 4
    if a >= 255 then
        local packed = floor(r + 0.5) + floor(g + 0.5) * 256 + floor(b + 0.5) * 65536 + 4278190080
        for o = o0, o1, 4 do writeu32(buf, o, packed) end
        return
    end
    local packed0 = floor(r + 0.5) + floor(g + 0.5) * 256 + floor(b + 0.5) * 65536 + floor(a + 0.5) * 16777216
    local sa = a / 255
    local ns = 1 - sa
    local c1 = ns / 255
    local rs, gs, bs = r * sa, g * sa, b * sa
    local last_d, last_v = -1, 0 -- UI backgrounds are mostly flat: reuse the previous result for the same destination
    for o = o0, o1, 4 do
        local d = readu32(buf, o)
        local da = rshift(d, 24)
        if d == last_d then
            writeu32(buf, o, last_v)
        elseif da == 0 then
            writeu32(buf, o, packed0)
        else
            last_d = d
            local dr, dg, db = band(d, 255), band(rshift(d, 8), 255), band(rshift(d, 16), 255)
            if da == 255 then
                last_v = floor(rs + dr * ns + 0.5) + floor(gs + dg * ns + 0.5) * 256 + floor(bs + db * ns + 0.5) * 65536 + 4278190080
            else
                local k = da * c1
                local oa = sa + k
                local inv = 1 / oa
                last_v = floor((rs + dr * k) * inv + 0.5) + floor((gs + dg * k) * inv + 0.5) * 256
                    + floor((bs + db * k) * inv + 0.5) * 65536 + floor(oa * 255 + 0.5) * 16777216
            end
            writeu32(buf, o, last_v)
        end
    end
end

@native
local function UnpackColor(col)
    return col % 256, floor(col / 256) % 256, floor(col / 65536) % 256, floor(col / 16777216) % 256
end

-- Nearest texel at (u, v) as r, g, b, a (0..255)
@native
local function SampleTexture(t, u, v)
    local tw, th = t.Width, t.Height
    local tx, ty = floor(u * tw), floor(v * th)
    if tx < 0 then tx = 0 elseif tx >= tw then tx = tw - 1 end
    if ty < 0 then ty = 0 elseif ty >= th then ty = th - 1 end
    local o = (ty * tw + tx) * 4
    local tb = t.Buffer
    return readu8(tb, o), readu8(tb, o + 1), readu8(tb, o + 2), readu8(tb, o + 3)
end

-- Axis aligned, single colour quad (rects, glyphs, images). Pixel centers inside [x0, x1) x [y0, y1) are drawn.
@native
local function DrawRect(x0, y0, x1, y1, u0, v0, u1, v1, col, t, cx0, cy0, cx1, cy1)
    local r, g, b, a = UnpackColor(col)
    if a == 0 then return end
    local px0, py0 = max(ceil(x0 - 0.5), cx0), max(ceil(y0 - 0.5), cy0)
    local px1, py1 = min(ceil(x1 - 0.5), cx1), min(ceil(y1 - 0.5), cy1)
    if px0 >= px1 or py0 >= py1 then return end

    if not t or (u0 == u1 and v0 == v1) then
        if t then
            local tr, tg, tb, ta = SampleTexture(t, u0, v0)
            r, g, b, a = r * tr / 255, g * tg / 255, b * tb / 255, a * ta / 255
        end
        if a <= 0 then return end
        -- Rows of a flat rect usually blend over identical rows: when this row's destination equals the previous
        -- row's (exact string compare), the result is identical too, so memcpy the previous row's result.
        local len = (px1 - px0) * 4
        local prev_dst, prev_o = nil, 0
        for y = py0, py1 - 1 do
            local o = (y * buf_w + px0) * 4
            if a >= 255 then
                if prev_dst then buffer.copy(buf, o, buf, prev_o, len) else FillSpan(y, px0, px1, r, g, b, a); prev_dst = true end
            else
                local dst = readstring(buf, o, len)
                if dst == prev_dst then
                    buffer.copy(buf, o, buf, prev_o, len)
                else
                    FillSpan(y, px0, px1, r, g, b, a)
                    prev_dst = dst
                end
            end
            prev_o = o
        end
        return
    end

    local du, dv = (u1 - u0) / (x1 - x0), (v1 - v0) / (y1 - y0)
    local tw, th, tbuf = t.Width, t.Height, t.Buffer
    local r255, g255, b255, a255 = r / 255, g / 255, b / 255, a / 255
    for y = py0, py1 - 1 do
        local ty = floor((v0 + (y + 0.5 - y0) * dv) * th)
        if ty < 0 then ty = 0 elseif ty >= th then ty = th - 1 end
        local trow = ty * tw
        local o = (y * buf_w + px0) * 4
        for x = px0, px1 - 1 do
            local tx = floor((u0 + (x + 0.5 - x0) * du) * tw)
            if tx < 0 then tx = 0 elseif tx >= tw then tx = tw - 1 end
            local to = (trow + tx) * 4
            local ta = readu8(tbuf, to + 3)
            if ta > 0 then
                BlendPixel(o, readu8(tbuf, to) * r255, readu8(tbuf, to + 1) * g255, readu8(tbuf, to + 2) * b255, ta * a255)
            end
            o = o + 4
        end
    end
end

-- Generic triangle: per-vertex colour + uv, top-left fill rule, clipped to [cx0, cx1) x [cy0, cy1)
@native
local function DrawTriangle(va, vb, vc, t, cx0, cy0, cx1, cy1, ox, oy)
    local x0, y0 = va[1][1] - ox, va[1][2] - oy
    local x1, y1 = vb[1][1] - ox, vb[1][2] - oy
    local x2, y2 = vc[1][1] - ox, vc[1][2] - oy
    local area = (x1 - x0) * (y2 - y0) - (y1 - y0) * (x2 - x0)
    if area == 0 then return end
    if area < 0 then -- make the winding consistent so "inside" means all edge functions >= 0
        vb, vc = vc, vb
        x1, y1, x2, y2 = x2, y2, x1, y1
        area = -area
    end

    local minx, maxx = max(floor(min(x0, x1, x2)), cx0), min(ceil(max(x0, x1, x2)), cx1 - 1)
    local miny, maxy = max(floor(min(y0, y1, y2)), cy0), min(ceil(max(y0, y1, y2)), cy1 - 1)
    if minx > maxx or miny > maxy then return end

    -- Edge functions E(p) = A*px + B*py + C, w0 is opposite va, w1 opposite vb, w2 opposite vc
    local A0, B0 = y1 - y2, x2 - x1; local C0 = -(A0 * x1 + B0 * y1)
    local A1, B1 = y2 - y0, x0 - x2; local C1 = -(A1 * x2 + B1 * y2)
    local A2, B2 = y0 - y1, x1 - x0; local C2 = -(A2 * x0 + B2 * y0)
    local tl0 = A0 > 0 or (A0 == 0 and B0 > 0)
    local tl1 = A1 > 0 or (A1 == 0 and B1 > 0)
    local tl2 = A2 > 0 or (A2 == 0 and B2 > 0)

    local inv = 1 / area
    local ra, ga, ba, aa = UnpackColor(va[3])
    local rb, gb, bb, ab = UnpackColor(vb[3])
    local rc, gc, bc, ac = UnpackColor(vc[3])
    local ua, vva, ub, vvb, uc, vvc = va[2][1], va[2][2], vb[2][1], vb[2][2], vc[2][1], vc[2][2]

    local textured = t and not (ua == ub and ua == uc and vva == vvb and vva == vvc)
    if t and not textured then -- constant uv (e.g. the atlas white pixel): fold the texel into the vertex colours
        local tr, tg, tb, ta = SampleTexture(t, ua, vva)
        ra, ga, ba, aa = ra * tr / 255, ga * tg / 255, ba * tb / 255, aa * ta / 255
        rb, gb, bb, ab = rb * tr / 255, gb * tg / 255, bb * tb / 255, ab * ta / 255
        rc, gc, bc, ac = rc * tr / 255, gc * tg / 255, bc * tb / 255, ac * ta / 255
    end
    local flat = not textured and ra == rb and ra == rc and ga == gb and ga == gc and ba == bb and ba == bc and aa == ab and aa == ac
    if flat and aa <= 0 then return end

    for y = miny, maxy do
        local py = y + 0.5
        -- Narrow the x range of this row using the edges (expanded by one pixel, exact test below)
        local xl, xr = minx, maxx
        local e0, e1, e2 = B0 * py + C0, B1 * py + C1, B2 * py + C2
        if A0 ~= 0 then local xe = -e0 / A0 - 0.5; if A0 > 0 then xl = max(xl, floor(xe)) else xr = min(xr, ceil(xe)) end end
        if A1 ~= 0 then local xe = -e1 / A1 - 0.5; if A1 > 0 then xl = max(xl, floor(xe)) else xr = min(xr, ceil(xe)) end end
        if A2 ~= 0 then local xe = -e2 / A2 - 0.5; if A2 > 0 then xl = max(xl, floor(xe)) else xr = min(xr, ceil(xe)) end end

        local row = y * buf_w
        for x = xl, xr do
            local px = x + 0.5
            local w0, w1, w2 = A0 * px + e0, A1 * px + e1, A2 * px + e2
            if (w0 > 0 or (w0 == 0 and tl0)) and (w1 > 0 or (w1 == 0 and tl1)) and (w2 > 0 or (w2 == 0 and tl2)) then
                local o = (row + x) * 4
                if flat then
                    BlendPixel(o, ra, ga, ba, aa)
                else
                    w0, w1, w2 = w0 * inv, w1 * inv, w2 * inv
                    local r = w0 * ra + w1 * rb + w2 * rc
                    local g = w0 * ga + w1 * gb + w2 * gc
                    local b = w0 * ba + w1 * bb + w2 * bc
                    local a = w0 * aa + w1 * ab + w2 * ac
                    if textured then
                        local tr, tg, tb, ta = SampleTexture(t, w0 * ua + w1 * ub + w2 * uc, w0 * vva + w1 * vvb + w2 * vvc)
                        r, g, b, a = r * tr / 255, g * tg / 255, b * tb / 255, a * ta / 255
                    end
                    BlendPixel(o, r, g, b, a)
                end
            end
        end
    end
end

-- Quads emitted by PrimRect/PrimRectUV/RenderText use indices (a, b, c, a, c, d) with a=TL, b=TR, c=BR, d=BL.
-- When such a quad is axis aligned with one colour it is drawn with the much cheaper DrawRect.
@native
local function TryDrawRect(va, vb, vc, vd, t, cx0, cy0, cx1, cy1, ox, oy)
    local pa, pb, pc, pd = va[1], vb[1], vc[1], vd[1]
    if not (pa[2] == pb[2] and pb[1] == pc[1] and pc[2] == pd[2] and pd[1] == pa[1] and pa[1] < pb[1] and pa[2] < pd[2]) then return false end
    local col = va[3]
    if vb[3] ~= col or vc[3] ~= col or vd[3] ~= col then return false end
    local ta, tb, tc, td = va[2], vb[2], vc[2], vd[2]
    if not (tb[1] == tc[1] and tb[2] == ta[2] and td[1] == ta[1] and td[2] == tc[2]) then return false end
    DrawRect(pa[1] - ox, pa[2] - oy, pc[1] - ox, pc[2] - oy, ta[1], ta[2], tc[1], tc[2], col, t, cx0, cy0, cx1, cy1)
    return true
end

-- Tiles: the screen is covered by TILE x TILE EditableImages (one ImageLabel each). Every frame each primitive
-- (triangle, or axis aligned quad) is hashed into the tiles it touches; only tiles whose hash changed are
-- re-rasterized and uploaded. Static UI therefore costs ~nothing to draw, and the result is pixel-identical to a
-- full redraw (the hash covers everything that affects a tile's pixels: geometry, uv, colour, texture, clip, order).
local TILE = 256
TILE_SIZE = Vector2.new(TILE, TILE)
local P1, P2 = 2147483647, 2147483629 -- two independent 31 bit hashes per tile (collision odds ~2^-62)

-- Primitive arrays (reused between frames, no per-frame allocation)
local pr_a, pr_b, pr_c, pr_d, pr_t = {}, {}, {}, {}, {} -- vertices (pr_d == false -> triangle), texture
local pr_cx0, pr_cy0, pr_cx1, pr_cy1 = {}, {}, {}, {}  -- clip (screen pixels)

@native
local function HashVertex(h1, h2, v)
    local p, u, c = v[1], v[2], v[3]
    local x, y = p[1], p[2]
    local uv = u[1] * 8192 + u[2]
    h1 = (h1 * 48271 + x * 4096 + y) % P1
    h1 = (h1 * 48271 + uv * 4096) % P1
    h1 = (h1 * 48271 + c) % P1
    h2 = (h2 * 16807 + y * 4093 + x) % P2
    h2 = (h2 * 16807 + uv * 65521) % P2
    h2 = (h2 * 16807 + c) % P2
    return h1, h2
end

local function GetTile(bd, index, tx, ty)
    local tile = bd.Tiles[index]
    if tile then return tile end
    local img = AssetService:CreateEditableImage({ Size = Vector2.new(TILE, TILE) })
    assert(img, "imgui_impl_roblox: EditableImage memory budget exceeded")
    local label = Instance.new("ImageLabel")
    label.Name = "Tile" .. index
    label.BackgroundTransparency = 1
    label.BorderSizePixel = 0
    local scale = bd.Scale
    label.Size = UDim2.fromOffset(TILE / scale, TILE / scale)
    label.Position = UDim2.fromOffset(tx * TILE / scale, ty * TILE / scale)
    label.ResampleMode = Enum.ResamplerMode.Pixelated
    label.ImageContent = Content.fromObject(img)
    label.Visible = false
    label.Active = bd.TilesActive
    label.Parent = bd.Gui
    tile = { Image = img, Label = label, Buffer = buffer.create(TILE * TILE * 4), H1 = -1, H2 = -1, Visible = false }
    bd.Tiles[index] = tile
    return tile
end

local function DestroyTiles(bd)
    for _, tile in pairs(bd.Tiles) do tile.Label:Destroy(); tile.Image:Destroy() end
    bd.Tiles = {}
end

@native
function ImGui_ImplRoblox_RenderDrawData(draw_data)
    local bd = ImGui_ImplRoblox_GetBackendData()

    if draw_data.Textures ~= nil then
        for _, tex in draw_data.Textures:iter() do
            if tex.Status ~= ImTextureStatus.OK then
                ImGui_ImplRoblox_UpdateTexture(tex)
                bd.ForceRedraw = true -- texture contents changed: tiles sampling it must be redrawn
            end
        end
    end

    local sw, sh = floor(draw_data.DisplaySize.x), floor(draw_data.DisplaySize.y)
    if sw <= 0 or sh <= 0 then return end
    local cols, rows = ceil(sw / TILE), ceil(sh / TILE)
    if cols ~= bd.TileCols or rows ~= bd.TileRows then
        DestroyTiles(bd)
        bd.TileCols, bd.TileRows = cols, rows
    end
    local ntiles = cols * rows
    local ox, oy = draw_data.DisplayPos.x, draw_data.DisplayPos.y

    -- Per tile: hashes and the list of primitives touching it
    local th1, th2, tn, tl = bd.TH1, bd.TH2, bd.TN, bd.TL
    for t = 0, ntiles - 1 do
        th1[t], th2[t], tn[t] = 0, 0, 0
        if not tl[t] then tl[t] = {} end
    end

    -- Pass 1: collect primitives, hash them into tiles
    local n = 0
    for _, draw_list in draw_data.CmdLists:iter() do
        local vtx, idx = draw_list.VtxBuffer.Data, draw_list.IdxBuffer.Data
        for _, pcmd in draw_list.CmdBuffer:iter() do
            if pcmd.UserCallback ~= nil then
                pcmd.UserCallback(draw_list, pcmd)
            elseif pcmd.ElemCount > 0 then
                local clip = pcmd.ClipRect
                local cx0, cy0 = max(floor(clip.x - ox), 0), max(floor(clip.y - oy), 0)
                local cx1, cy1 = min(floor(clip.z - ox), sw), min(floor(clip.w - oy), sh)
                if cx1 > cx0 and cy1 > cy0 then
                    local tex_id = pcmd:GetTexID()
                    local t = bd.Textures[tex_id]
                    local ch1 = ((cx0 * 8191 + cy0) * 8191 + cx1) % P1
                    local ch2 = ((cy1 * 8191 + cx1) * 8191 + cy0 + tex_id) % P2
                    local vo = pcmd.VtxOffset
                    local i, last = pcmd.IdxOffset + 1, pcmd.IdxOffset + pcmd.ElemCount
                    while i <= last do
                        local ia, ic = idx[i], idx[i + 2]
                        local va, vb, vc = vtx[vo + ia], vtx[vo + idx[i + 1]], vtx[vo + ic]
                        local vd = false
                        local pa, pb, pc = va[1], vb[1], vc[1]
                        local bx0, by0, bx1, by1
                        if i + 5 <= last and idx[i + 3] == ia and idx[i + 4] == ic then
                            local d = vtx[vo + idx[i + 5]]
                            local pd = d[1]
                            -- axis aligned quad (TL, TR, BR, BL) with one colour and a matching uv rect
                            if pa[2] == pb[2] and pb[1] == pc[1] and pc[2] == pd[2] and pd[1] == pa[1] and pa[1] < pb[1] and pa[2] < pd[2] then
                                local col = va[3]
                                local ta, tb, tc, td = va[2], vb[2], vc[2], d[2]
                                if vb[3] == col and vc[3] == col and d[3] == col
                                    and tb[1] == tc[1] and tb[2] == ta[2] and td[1] == ta[1] and td[2] == tc[2] then
                                    vd = d
                                    bx0, by0 = ceil(pa[1] - ox - 0.5), ceil(pa[2] - oy - 0.5)
                                    bx1, by1 = ceil(pc[1] - ox - 0.5), ceil(pc[2] - oy - 0.5)
                                end
                            end
                        end
                        if vd then
                            i = i + 6
                        else
                            bx0, by0 = floor(min(pa[1], pb[1], pc[1]) - ox), floor(min(pa[2], pb[2], pc[2]) - oy)
                            bx1, by1 = ceil(max(pa[1], pb[1], pc[1]) - ox) + 1, ceil(max(pa[2], pb[2], pc[2]) - oy) + 1
                            i = i + 3
                        end
                        if bx0 < cx0 then bx0 = cx0 end
                        if by0 < cy0 then by0 = cy0 end
                        if bx1 > cx1 then bx1 = cx1 end
                        if by1 > cy1 then by1 = cy1 end
                        if bx0 < bx1 and by0 < by1 then
                            n = n + 1
                            pr_a[n], pr_b[n], pr_c[n], pr_d[n], pr_t[n] = va, vb, vc, vd, t
                            pr_cx0[n], pr_cy0[n], pr_cx1[n], pr_cy1[n] = cx0, cy0, cx1, cy1
                            local h1, h2 = HashVertex(ch1, ch2, va)
                            h1, h2 = HashVertex(h1, h2, vb)
                            h1, h2 = HashVertex(h1, h2, vc)
                            if vd then h1, h2 = HashVertex(h1, h2, vd) end
                            for ty = floor(by0 / TILE), floor((by1 - 1) / TILE) do
                                for tx = floor(bx0 / TILE), floor((bx1 - 1) / TILE) do
                                    local ti = ty * cols + tx
                                    local k = tn[ti] + 1
                                    tn[ti] = k
                                    tl[ti][k] = n
                                    th1[ti] = (th1[ti] * 48271 + h1) % P1
                                    th2[ti] = (th2[ti] * 16807 + h2 + k) % P2
                                end
                            end
                        end
                    end
                end
            end
        end
    end

    -- Pass 2: redraw + upload changed tiles
    local force = bd.ForceRedraw
    bd.ForceRedraw = false
    for ty = 0, rows - 1 do
        for tx = 0, cols - 1 do
            local ti = ty * cols + tx
            local count = tn[ti]
            local tile = bd.Tiles[ti]
            if count == 0 then
                if tile and tile.Visible then
                    tile.Visible = false
                    tile.Label.Visible = false
                    tile.H1 = -1
                end
            else
                tile = tile or GetTile(bd, ti, tx, ty)
                if force or tile.H1 ~= th1[ti] or tile.H2 ~= th2[ti] then
                    tile.H1, tile.H2 = th1[ti], th2[ti]
                    local x0, y0 = tx * TILE, ty * TILE
                    local x1, y1 = x0 + TILE, y0 + TILE
                    buf, buf_w = tile.Buffer, TILE
                    buffer.fill(buf, 0, 0)
                    local list = tl[ti]
                    local tox, toy = ox + x0, oy + y0
                    for k = 1, count do
                        local p = list[k]
                        local cx0, cy0 = max(pr_cx0[p], x0) - x0, max(pr_cy0[p], y0) - y0
                        local cx1, cy1 = min(pr_cx1[p], x1) - x0, min(pr_cy1[p], y1) - y0
                        local va, vc, vd = pr_a[p], pr_c[p], pr_d[p]
                        if vd then
                            local pa, pc, ta, tc = va[1], vc[1], va[2], vc[2]
                            DrawRect(pa[1] - tox, pa[2] - toy, pc[1] - tox, pc[2] - toy, ta[1], ta[2], tc[1], tc[2], va[3], pr_t[p], cx0, cy0, cx1, cy1)
                        else
                            DrawTriangle(va, pr_b[p], vc, pr_t[p], cx0, cy0, cx1, cy1, tox, toy)
                        end
                    end
                    tile.Image:WritePixelsBuffer(Vector2.zero, TILE_SIZE, buf)
                end
                if not tile.Visible then
                    tile.Visible = true
                    tile.Label.Visible = true
                end
            end
        end
    end

    -- drop references so old vertex tables can be collected
    for k = n + 1, bd.LastPrimCount do pr_a[k], pr_b[k], pr_c[k], pr_d[k], pr_t[k] = nil, nil, nil, nil, nil end
    bd.LastPrimCount = n
end

---------------------------------------------------------
-- CORE LIFECYCLE
---------------------------------------------------------

--- @param parent Instance? # where the ScreenGui goes, defaults to the local player's PlayerGui
--- @param render_scale number? # imgui pixels per Roblox UI point (defaults to 1). Roblox UI points are scaled by the
---                             # OS display scale, so on a 150% display pass 1.5 to render at physical resolution
---                             # (imgui then looks the same size as a desktop imgui app). Change later with SetRenderScale().
function ImGui_ImplRoblox_Init(parent, render_scale)
    local io = ImGui.GetIO()

    local gui = Instance.new("ScreenGui")
    gui.Name = "ImGui"
    gui.IgnoreGuiInset = true -- so GetMouseLocation() and the tiles share the same origin
    gui.ResetOnSpawn = false
    gui.DisplayOrder = 1000
    gui.Parent = parent or Players.LocalPlayer:WaitForChild("PlayerGui")

    local bd = {
        Time = os.clock(), Gui = gui, Connections = {},
        Textures = {}, TextureCount = 0, MouseX = -1, MouseY = -1,
        Tiles = {}, TileCols = 0, TileRows = 0, Scale = render_scale or 1, TilesActive = false, TH1 = {}, TH2 = {}, TN = {}, TL = {}, LastPrimCount = 0, ForceRedraw = true,
    }
    io.BackendPlatformUserData = bd

    io.BackendFlags = bit32.bor(io.BackendFlags, ImGuiBackendFlags.RendererHasTextures, ImGuiBackendFlags.RendererHasVtxOffset)

    local platform_io = ImGui.GetPlatformIO()
    platform_io.Platform_SetClipboardTextFn = ImGui_ImplRoblox_PlatformSetClipboardText
    platform_io.Platform_GetClipboardTextFn = ImGui_ImplRoblox_PlatformGetClipboardText

    local screen = gui.AbsoluteSize
    ImGui_ImplRoblox_UpdateMonitors(screen.X, screen.Y)

    local function connect(signal, fn) table.insert(bd.Connections, signal:Connect(fn)) end

    connect(UserInputService.InputBegan, function(input, game_processed)
        local io = ImGui.GetIO()
        local button = MOUSE_BUTTONS[input.UserInputType]
        if button then
            io:AddMouseSourceEvent(ImGuiMouseSource.Mouse)
            io:AddMouseButtonEvent(button, true)
        elseif input.UserInputType == Enum.UserInputType.Keyboard and not game_processed then
            local ctrl, shift, alt = ImGui_ImplRoblox_UpdateKeyModifiers()
            local key = KEY_MAP[input.KeyCode]
            if key then io:AddKeyEvent(key, true) end

            -- Text: printable ASCII keys, skipped while Ctrl/Alt are held (shortcuts)
            local v = input.KeyCode.Value
            if v >= 32 and v < 127 and not (ctrl or alt) then
                local c = string.char(v)
                if shift then c = SHIFTED[c] or c:upper() end
                io:AddInputCharacter(string.byte(c))
            end
        end
    end)

    connect(UserInputService.InputEnded, function(input, game_processed)
        local io = ImGui.GetIO()
        local button = MOUSE_BUTTONS[input.UserInputType]
        if button then
            io:AddMouseButtonEvent(button, false)
        elseif input.UserInputType == Enum.UserInputType.Keyboard then
            ImGui_ImplRoblox_UpdateKeyModifiers()
            local key = KEY_MAP[input.KeyCode]
            if key then io:AddKeyEvent(key, false) end
        end
    end)

    connect(UserInputService.InputChanged, function(input, game_processed)
        if input.UserInputType == Enum.UserInputType.MouseWheel then
            ImGui.GetIO():AddMouseWheelEvent(0, input.Position.Z)
        end
    end)

    connect(UserInputService.WindowFocused, function() ImGui.GetIO():AddFocusEvent(true) end)
    connect(UserInputService.WindowFocusReleased, function() ImGui.GetIO():AddFocusEvent(false) end)
end

function ImGui_ImplRoblox_Shutdown()
    local io = ImGui.GetIO()
    local bd = ImGui_ImplRoblox_GetBackendData()
    for _, c in ipairs(bd.Connections) do c:Disconnect() end
    DestroyTiles(bd)
    bd.Gui:Destroy()

    io.BackendPlatformUserData = nil
    io.BackendFlags = bit32.band(io.BackendFlags, bit32.bnot(bit32.bor(
        ImGuiBackendFlags.RendererHasTextures,
        ImGuiBackendFlags.RendererHasVtxOffset
    )))
end

function ImGui_ImplRoblox_NewFrame()
    local io = ImGui.GetIO()
    local bd = ImGui_ImplRoblox_GetBackendData()

    local screen = bd.Gui.AbsoluteSize
    local w, h = floor(screen.X * bd.Scale), floor(screen.Y * bd.Scale)
    if w ~= bd.ScreenW or h ~= bd.ScreenH then
        bd.ScreenW, bd.ScreenH = w, h
        ImGui_ImplRoblox_UpdateMonitors(w, h)
    end
    ImVec2_CopyV(io.DisplaySize, w, h)

    local current_time = os.clock()
    io.DeltaTime = (current_time > bd.Time) and (current_time - bd.Time) or (1.0 / 60.0)
    bd.Time = current_time

    local m = UserInputService:GetMouseLocation()
    if m.X ~= bd.MouseX or m.Y ~= bd.MouseY then
        bd.MouseX, bd.MouseY = m.X, m.Y
        io:AddMouseSourceEvent(ImGuiMouseSource.Mouse)
        io:AddMousePosEvent(m.X * bd.Scale, m.Y * bd.Scale)
    end

    -- While the mouse is over imgui, make the tiles Active so Roblox stops passing clicks/wheel to the game (camera zoom etc.)
    local want = io.WantCaptureMouse
    if want ~= bd.TilesActive then
        bd.TilesActive = want
        for _, tile in pairs(bd.Tiles) do tile.Label.Active = want end
    end
end

function ImGui_ImplRoblox_SetRenderScale(scale)
    local bd = ImGui_ImplRoblox_GetBackendData()
    if scale == bd.Scale then return end
    bd.Scale = scale
    DestroyTiles(bd)
    bd.TileCols, bd.TileRows = 0, 0
    bd.ForceRedraw = true
end

ImGui_ImplRoblox = {
    Init           = ImGui_ImplRoblox_Init,
    Shutdown       = ImGui_ImplRoblox_Shutdown,
    NewFrame       = ImGui_ImplRoblox_NewFrame,
    RenderDrawData = ImGui_ImplRoblox_RenderDrawData,
    AddFile        = ImGui_ImplRoblox_AddFile,
    SetRenderScale = ImGui_ImplRoblox_SetRenderScale,
}

return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imgui_impl_roblox_fonts.lua'] = function()
-- [Roblox] Embedded copies of resource/fonts/*.ttf (Roblox can't read files). Generated: hex encoded bytes.
-- Add your own fonts the same way, or at runtime with ImGui_ImplRoblox.AddFile(path, bytes).
return {
    ["resource/fonts/ProggyClean.ttf"] = [[
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]],
}
end

__FILES['imgui_internal.lua'] = function()
--- ImGui Sincerely WIP
-- (internal structures/api)

--- @meta

local type   = ImGui._GetTypeFunc()
local rawget = rawget

local mathMin   = math.min; local mathMax    = math.max
local mathFloor = math.floor; local mathCeil = math.ceil

local bitNot    = bit32.bnot
local bitAnd    = bit32.band; local bitOr       = bit32.bor
local bitLShift = bit32.lshift; local bitRShift = bit32.rshift

local t_sort = table.sort

--- @alias ImGuiTableColumnIdx ImS16

-- TODO: Implement actual ImString type
--- @alias ImString char[]|string
--- @alias ImStringBuffer char[]

-- NOTE: temporary solution
--- @param buf       char[]
--- @param buf_begin int
--- @param buf_end   int    # exclusive
function ImGui._ByteArrayToString(buf, buf_begin, buf_end)
    local str = {}
    for i = buf_begin, buf_end - 1 do
        table.insert(str, string.char(buf[i]))
    end
    return table.concat(str)
end


--- ImPool<T>: pool of objects keyed by ID. Public indices are 0-based like upstream (Buf is stored 1-based).
--- `ctor` creates a new element. Removed slots are recycled via FreeIdx (-1 = none; free slots chain through `_NextFree`).
local IM_POOL = {}
IM_POOL.__index = IM_POOL
function ImPool(ctor) return setmetatable({ Buf = {}, Map = {}, FreeIdx = 0, AliveCount = 0, BufSize = 0, _Ctor = ctor }, IM_POOL) end
function IM_POOL:GetByKey(key) local i = self.Map[key]; return i and self.Buf[i + 1] or nil end
function IM_POOL:GetByIndex(n) return self.Buf[n + 1] end
function IM_POOL:GetIndex(p) return p._PoolIdx end
function IM_POOL:Contains(p) return p ~= nil and self.Buf[(p._PoolIdx or -1) + 1] == p end
function IM_POOL:GetMapSize() return self.BufSize end
function IM_POOL:Clear() self.Buf = {}; self.Map = {}; self.FreeIdx = 0; self.AliveCount = 0; self.BufSize = 0 end
function IM_POOL:Add()
    local idx
    if self._Free and #self._Free > 0 then idx = table.remove(self._Free) else idx = self.BufSize; self.BufSize = self.BufSize + 1 end
    local p = self._Ctor and self._Ctor() or {}
    p._PoolIdx = idx
    self.Buf[idx + 1] = p
    self.AliveCount = self.AliveCount + 1
    return p
end
function IM_POOL:GetOrAddByKey(key)
    local i = self.Map[key]
    if i then return self.Buf[i + 1] end
    local p = self:Add(); self.Map[key] = p._PoolIdx; return p
end
function IM_POOL:Remove(key, p)
    if type(key) == "table" then p = key; key = nil end
    if key == nil then for k, i in pairs(self.Map) do if i == p._PoolIdx then key = k break end end end
    if key ~= nil then self.Map[key] = nil end
    self.Buf[p._PoolIdx + 1] = false
    self._Free = self._Free or {}
    table.insert(self._Free, p._PoolIdx)
    self.AliveCount = self.AliveCount - 1
end
function IM_POOL:Reserve(n) end
-- NOTE: removed slots hold `false`; iterate with `for i = 0, pool:GetMapSize() - 1 do local t = pool:GetByIndex(i) if t then ... end end`

--- @type ImGuiContext?
local GImGui

-- Sets local `GImGui` in this file(imgui_internal.lua).
-- This is currently only used in main code `ImGui.SetCurrentContext()`
--- @param ctx ImGuiContext?
function ImGui._SetCurrentContext_Internal(ctx)
    GImGui = ctx
end

local setmetatable = setmetatable

local MT = ImGui.GetMetatables()

IM_TABSIZE = 4

FLT_MIN = 1.1754943508223e-38
FLT_MAX = 3.4028234663853e+38
DBL_MAX = 1.7976931348623e+308
INT_MIN = -0x7fffffff - 1
INT_MAX = 0x7fffffff
UINT_MAX = 0x7fffffff * 2 + 1

NAV_WINDOWING_HIGHLIGHT_DELAY = 0.5
NAV_ACTIVATE_HIGHLIGHT_TIMER = 0.10
NAV_ACTIVATE_INPUT_WITH_GAMEPAD_DELAY = 0.60

IM_PI  = math.pi
ImPow  = math.pow
ImLog  = math.log
ImAbs  = math.abs
ImFabs = math.abs
ImFmod = function(a, b) if b < 0 then b = -b end; if a < 0 then return -(-a % b) else return a % b end; end

ImRound64 = function(val) return math.floor(val + 0.5) end -- FIXME: Positive values only

ImCeil  = math.ceil
ImSin   = math.sin
ImCos   = math.cos
ImAcos  = math.acos
ImAtan2 = math.atan2
ImSqrt  = math.sqrt

--- @generic T: number
--- @param a  T
--- @param b  T
--- @param mn T
--- @param mx T
--- @return T
function ImAddClampOverflow(a, b, mn, mx)
    if b < 0 and (a < mn - b) then return mn end
    if b > 0 and (a > mx - b) then return mx end
    return a + b
end

--- @generic T: number
--- @param a  T
--- @param b  T
--- @param mn T
--- @param mx T
--- @return T
function ImSubClampOverflow(a, b, mn, mx)
    if b > 0 and (a < mn + b) then return mn end
    if b < 0 and (a > mx + b) then return mx end
    return a - b
end

--- @overload fun(lhs: number, rhs: number): number
--- @overload fun(lhs: ImVec2, rhs: ImVec2): ImVec2
function ImMin(lhs, rhs)
    if     type(lhs) == "number" and type(rhs) == "number" then return mathMin(lhs, rhs)
    elseif type(lhs) == "table"  and type(rhs) == "table"  then return ImVec2(mathMin(lhs[1], rhs[1]), mathMin(lhs[2], rhs[2]))
    end
end

--- @overload fun(lhs: number, rhs: number): number
--- @overload fun(lhs: ImVec2, rhs: ImVec2): ImVec2
function ImMax(lhs, rhs)
    if     type(lhs) == "number" and type(rhs) == "number" then return mathMax(lhs, rhs)
    elseif type(lhs) == "table"  and type(rhs) == "table"  then return ImVec2(mathMax(lhs[1], rhs[1]), mathMax(lhs[2], rhs[2]))
    end
end

--- @param base     table
--- @param count    int
--- @param cmp_func fun(lhs, rhs): bool
ImStd.ImQsort = function(base, count, cmp_func) if count > 0 then t_sort(base, cmp_func) end end

--- @overload fun(v: number, mn: number, mx: number): number
--- @overload fun(v: ImVec2, mn: ImVec2, mx: ImVec2): ImVec2
function ImClamp(v, mn, mx)
    if     type(v) == "number" and type(mn) == "number" and type(mx) == "number" then return mathMin(mathMax(v, mn), mx)
    elseif type(v) == "table"  and type(mn) == "table"  and type(mx) == "table"  then return ImVec2(mathMax(mn[1], mathMin(v[1], mx[1])), mathMax(mn[2], mathMin(v[2], mx[2])))
    end
end

--- @overload fun(a: number, b: number, t: number): number
--- @overload fun(a: ImVec2, b: ImVec2, t: number): ImVec2
--- @overload fun(a: ImVec2, b: ImVec2, t: ImVec2): ImVec2
function ImLerp(a, b, t)
    if     type(a) == "number" and type(b) == "number" and type(t) == "number" then return ((a) + ((b) - (a)) * (t))
    elseif type(a) == "table"  and type(b) == "table"  and type(t) == "number" then return ImVec2(a[1] + (b[1] - a[1]) * t, a[2] + (b[2] - a[2]) * t)
    elseif type(a) == "table"  and type(b) == "table"  and type(t) == "table"  then return ImVec2(a[1] + (b[1] - a[1]) * t[1], a[2] + (b[2] - a[2]) * t[2])
    end
end

local function _Trunc(val) if val >= 0 then return mathFloor(val) else return mathCeil(val) end end

--- @overload fun(v: float): float
--- @overload fun(v: ImVec2): ImVec2
function ImTrunc(v)
    if     type(v) == "number" then return _Trunc(v)
    elseif type(v) == "table"  then return ImVec2(_Trunc(v[1]), _Trunc(v[2]))
    end
end

ImTrunc64 = _Trunc

--- @param f float
function ImCeilFast(f)
    local i
    if f >= 0 then i = math.floor(f) else i = math.ceil(f) end -- same as `ImTrunc()`
    if f > i then return i + 1 end
    return i
end

function IM_ROUNDUP_TO_EVEN(n) return (ImCeil((n) / 2) * 2) end
function ImRsqrt(x)            return (1 / ImSqrt(x))       end

function IM_TRUNC(VAL) return math.floor(VAL) end -- Positive values only!
function IM_ROUND(VAL) return math.floor(VAL + 0.5) end

function ImFloor(f) if f >= 0 or math.floor(f) == f then return math.floor(f) else return math.floor(f) - 1 end end

--- @param v int
function ImIsPowerOfTwo(v)
    return (v ~= 0) and (bitAnd(v, (v - 1)) == 0)
end

function ImUpperPowerOfTwo(v)
    if v <= 0 then return 0 end
    if v <= 1 then return 1 end

    v = v - 1
    v = bitOr(v, bitRShift(v, 1))
    v = bitOr(v, bitRShift(v, 2))
    v = bitOr(v, bitRShift(v, 4))
    v = bitOr(v, bitRShift(v, 8))
    v = bitOr(v, bitRShift(v, 16))
    return v + 1
end

--- @param v unsigned_int
--- @return unsigned_int
function ImCountSetBits(v)
    local count = 0
    while v > 0 do
        v = bitAnd(v, v - 1)
        count = count + 1
    end
    return count
end

--- @param avg    float
--- @param sample float
--- @param n      int
--- @return float
function ImStd.ImExponentialMovingAverage(avg, sample, n)
    avg = avg - avg / n
    avg = avg + sample / n
    return avg
end

-- Uses `string.match` internally
--- @param str string
function ImAtof(str)
    return tonumber(string.match(str, "[+-]?%d*%.?%d+"))
end

--- @param s table # 1-based
--- @param c any
--- @param n int
function ImStd.memset(s, c, n)
    for i = 1, n do s[i] = c end
end

do

local _memmove = function(dest, dest_start, src, src_start, count)
    if count <= 0 then return end

    -- more compact instead of writing separate if-else and for loops
    local c = (dest == src and dest_start >= src_start)
    for i = (c and count - 1 or 0), (c and 0 or count - 1), (c and -1 or 1) do
        dest[dest_start + i] = src[src_start + i]
    end
end

if table.move then
    --- [GMod] Platform specific: the `table.move` polyfill in non-x86-64 currently uses `unpack` which will break if too many elements
    -- Remove this check when the polyfill is fixed or removed
    if not gmod or (gmod and BRANCH == "x86-64") then
        _memmove = function(dest, dest_start, src, src_start, count)
            table.move(src, src_start, src_start + count - 1, dest_start, dest)
        end
    end
end

ImStd.memmove = _memmove

end

--- @param str1 ImStringBuffer
--- @param str2 ImStringBuffer
function ImStd.strcmp(str1, str2)
    local i = 1
    while true do
        local c1 = str1[i] or 0
        local c2 = str2[i] or 0

        if c1 ~= c2 then
            return c1 - c2
        end

        if c1 == 0 then
            return 0
        end

        i = i + 1
    end
end

--- @param str1      ImStringBuffer
--- @param str2      ImStringBuffer
--- @param max_count int
function ImStd.strncmp(str1, str2, max_count)
    for i = 1, max_count do
        local c1 = str1[i] or 0
        local c2 = str2[i] or 0

        if c1 ~= c2 then
            return c1 - c2
        end

        if c1 == 0 then
            return 0
        end
    end
    return 0
end

function ImSaturate(f) return ((f < 0.0 and 0.0) or (f > 1.0 and 1.0) or f) end

IM_F32_TO_INT8_UNBOUND = function(val) return math.floor(val * 255.0 + (val >= 0 and 0.5 or -0.5)) end
IM_F32_TO_INT8_SAT = function(val) return math.floor(ImSaturate(val) * 255.0 + 0.5) end

--- @param s ImString
--- @param i int
--- @return char
function ImStrByte(s, i)
    if type(s) == "string" then
        return string.byte(s, i, i)
    else --- @cast s char[]
        return s[i]
    end
end

--- @class ImGuiColorMod
--- @field Col         ImGuiCol
--- @field BackupValue ImVec4

--- @param col          ImGuiCol
--- @param backup_value ImVec4
--- @return ImGuiColorMod
function ImGuiColorMod(col, backup_value)
    local this = {
        Col = col,
        BackupValue = ImVec4()
    }

    ImVec4_Copy(this.BackupValue, backup_value)

    return this
end

--- @param lhs ImVec2
--- @return float
function ImLengthSqr(lhs) return (lhs.x * lhs.x) + (lhs.y * lhs.y) end

--- @param v     ImVec2
--- @param cos_a float
--- @param sin_a float
--- @return ImVec2
--- @nodiscard
function ImRotate(v, cos_a, sin_a)
    return ImVec2(v.x * cos_a - v.y * sin_a, v.x * sin_a + v.y * cos_a)
end

--- @param a ImVec2
--- @param b ImVec2
function ImDot(a, b)
    return a.x * b.x + a.y * b.y
end

--- @param lhs ImVec2
--- @param rhs ImVec2
--- @nodiscard
function ImMul(lhs, rhs)
    return ImVec2(lhs.x * rhs.x, lhs.y * rhs.y)
end

--- @param str    char[]
--- @param begin? int
function ImStd.ImStrlen(str, begin)
    if begin == nil then begin = 1 end

    local l = #str

    for i = begin, l do
        if str[i] == 0 then
            return i - begin
        end
    end

    IM_ASSERT(false)
end

-- FIXME: should also accept count?
-- FIXME: avoid dynamic type checking?
-- string.find with patterns disabled
--- @param str        string|char[]
--- @param s          string|char
--- @param start_pos? int
--- @return int?
function ImMemchr(str, s, start_pos)
    local start = start_pos or 1
    if start < 1 then start = 1 end

    if type(str) == "table" then
        for i = start, #str do
            if str[i] == 0 then break end

            if str[i] == s then
                return i
            end
        end

        return nil
    end

    --- @cast str string
    local pos = string.find(str, s, start, true)

    return pos
end

IMGUI_FONT_SIZE_MAX                                = 512.0
IMGUI_FONT_SIZE_THRESHOLD_FOR_LOADADVANCEXONLYMODE = 128.0

IMGUI_WINDOW_HARD_MIN_SIZE = 4.0

IM_DRAWLIST_ARCFAST_TABLE_SIZE = 48
IM_DRAWLIST_ARCFAST_SAMPLE_MAX = IM_DRAWLIST_ARCFAST_TABLE_SIZE

-- Upstream: `if (!(expr) && ErrorLog(msg)) IM_ASSERT(0)`. ErrorLog() returns io.ConfigErrorRecoveryEnableAssert.
function IM_ASSERT_USER_ERROR(_EXPR, _MSG) if not (_EXPR) or (_EXPR) == 0 then if not ImGui.ErrorLog or ImGui.ErrorLog(_MSG) then error(_MSG, 2) end end end
function IM_ASSERT_USER_ERROR_RET(_EXPR, _MSG) if not (_EXPR) or (_EXPR) == 0 then error(_MSG, 2) end end

function IMGUI_DEBUG_LOG_ACTIVEID(_str, ...) local g  = GImGui if bitAnd(g.DebugLogFlags, ImGuiDebugLogFlags.EventActiveId) ~= 0 then print(string.format(_str, ...)) end end
function IMGUI_DEBUG_LOG_POPUP(_str, ...)    local g  = GImGui if bitAnd(g.DebugLogFlags, ImGuiDebugLogFlags.EventPopup) ~= 0 then print(string.format(_str, ...)) end end
function IMGUI_DEBUG_LOG_FONT(_str, ...)     local g2 = GImGui if g2 and bitAnd(g2.DebugLogFlags, ImGuiDebugLogFlags.EventFont) ~= 0 then print(string.format(_str, ...)) end end
function IMGUI_DEBUG_LOG_VIEWPORT(_str, ...) local g  = GImGui if bitAnd(g.DebugLogFlags, ImGuiDebugLogFlags.EventViewport) ~= 0 then print(string.format(_str, ...)) end end

--- @alias ImGuiSelectionUserData any
ImGuiSelectionUserData_Invalid = -1

ImGuiKeyOwner_Any     = 0
ImGuiKeyOwner_NoOwner = 4294967295

--- @param button ImGuiMouseButton
--- @return ImGuiKey
function ImGui.MouseButtonToKey(button) IM_ASSERT(button >= 0 and button < ImGuiMouseButton.COUNT) return ImGuiKey.MouseLeft + button end

--- @param key ImGuiKey
function ImGui.IsNamedKey(key)
    return key >= ImGuiKey.NamedKey_BEGIN and key < ImGuiKey.NamedKey_END
end

--- @param key ImGuiKey
function ImGui.IsKeyboardKey(key)
    return key >= ImGuiKey_Keyboard_BEGIN and key < ImGuiKey_Keyboard_END
end

--- @param key ImGuiKey
function ImGui.IsGamepadKey(key)
    return key >= ImGuiKey_Gamepad_BEGIN and key < ImGuiKey_Gamepad_END
end

--- @param key ImGuiKey
function ImGui.IsMouseKey(key)
    return key >= ImGuiKey_Mouse_BEGIN and key < ImGuiKey_Mouse_END
end

--- @param key ImGuiKey
function ImGui.IsAliasKey(key)
    return key >= ImGuiKey_Aliases_BEGIN and key < ImGuiKey_Aliases_END
end

--- @param key ImGuiKey
function ImGui.IsLRModKey(key)
    return key >= ImGuiKey.LeftCtrl and key <= ImGuiKey.RightSuper
end

--- @param key ImGuiKey
--- @return bool
function ImGui.IsNamedKeyOrMod(key)
    return (key >= ImGuiKey.NamedKey_BEGIN and key < ImGuiKey.NamedKey_END) or key == ImGuiMod_Ctrl or key == ImGuiMod_Shift or key == ImGuiMod_Alt or key == ImGuiMod_Super
end

--- @param key ImGuiKey
--- @return ImGuiKey
function ImGui.ConvertSingleModFlagToKey(key)
    if key == ImGuiMod_Ctrl then
        return ImGuiKey.ReservedForModCtrl
    elseif key == ImGuiMod_Shift then
        return ImGuiKey.ReservedForModShift
    elseif key == ImGuiMod_Alt then
        return ImGuiKey.ReservedForModAlt
    elseif key == ImGuiMod_Super then
        return ImGuiKey.ReservedForModSuper
    end
    return key
end

--- @param ctx ImGuiContext
--- @param key ImGuiKey
function ImGui.GetKeyOwnerData(ctx, key)
    if bitAnd(key, ImGuiMod_Mask_) ~= 0 then key = ImGui.ConvertSingleModFlagToKey(key) end
    IM_ASSERT(ImGui.IsNamedKey(key))
    return ctx.KeysOwnerData[key - ImGuiKey.NamedKey_BEGIN]
end

--- @class ImGuiKeyOwnerData

--- @return ImGuiKeyOwnerData
--- @nodiscard
function ImGuiKeyOwnerData()
    return {
        OwnerCurr        = ImGuiKeyOwner_NoOwner,
        OwnerNext        = ImGuiKeyOwner_NoOwner,
        LockThisFrame    = false,
        LockUntilRelease = false
    }
end

--- @param size float
--- @return float
function ImGui.GetRoundedFontSize(size) return IM_ROUND(size) end

--- @param window ImGuiWindow
--- @param r      ImRect
--- @return ImRect
--- @nodiscard
function ImGui.WindowRectAbsToRel(window, r) local off = window.DC.CursorStartPos return ImRect(r.Min.x - off.x, r.Min.y - off.y, r.Max.x - off.x, r.Max.y - off.y) end

--- @param window ImGuiWindow
--- @param r      ImRect
--- @nodiscard
function ImGui.WindowRectRelToAbs(window, r) local off = window.DC.CursorStartPos return ImRect(r.Min.x + off.x, r.Min.y + off.y, r.Max.x + off.x, r.Max.y + off.y) end

--- @param dir ImGuiDir
--- @return bool
function ImGui.IsActiveIdUsingNavDir(dir)
    local g = GImGui
    return bit32.band(g.ActiveIdUsingNavDirMask, bit32.lshift(1, dir)) ~= 0
end

--- @param window ImGuiWindow
--- @param p      ImVec2
--- @return ImVec2
--- @nodiscard
function ImGui.WindowPosAbsToRel(window, p) local off = window.DC.CursorStartPos return ImVec2(p.x - off.x, p.y - off.y) end

--- @param c char
--- @return bool # True if this character is a ' ' or '\t'
function ImCharIsBlankA(c) return c == 32 or c == 9 end

--- @param c char
function ImCharIsBlankW(c) return c == 32 or c == 9 or c == 0x3000 end

--- @enum ImGuiNavMoveFlags
ImGuiNavMoveFlags =
{
    None                  = 0,
    LoopX                 = bitLShift(1, 0),
    LoopY                 = bitLShift(1, 1),
    WrapX                 = bitLShift(1, 2),
    WrapY                 = bitLShift(1, 3),
    AllowCurrentNavId     = bitLShift(1, 4),
    AlsoScoreVisibleSet   = bitLShift(1, 5),
    ScrollToEdgeY         = bitLShift(1, 6),
    Forwarded             = bitLShift(1, 7),
    DebugNoResult         = bitLShift(1, 8),
    FocusApi              = bitLShift(1, 9),
    IsTabbing             = bitLShift(1, 10),
    IsPageMove            = bitLShift(1, 11),
    Activate              = bitLShift(1, 12),
    NoSelect              = bitLShift(1, 13),
    NoSetNavCursorVisible = bitLShift(1, 14),
    NoClearActiveId       = bitLShift(1, 15),
}

ImGuiNavMoveFlags.WrapMask_ = bitOr(ImGuiNavMoveFlags.LoopX, ImGuiNavMoveFlags.LoopY, ImGuiNavMoveFlags.WrapX, ImGuiNavMoveFlags.WrapY)

--- @enum ImGuiNavLayer
ImGuiNavLayer =
{
    Main  = 0,
    Menu  = 1,
    COUNT = 2
}

ImGuiItemFlags.ReadOnly               = bitLShift(1, 11)
ImGuiItemFlags.MixedValue             = bitLShift(1, 12)
ImGuiItemFlags.NoWindowHoverableCheck = bitLShift(1, 13)
ImGuiItemFlags.AllowOverlap           = bitLShift(1, 14)
ImGuiItemFlags.NoNavDisableMouseHover = bitLShift(1, 15)
ImGuiItemFlags.NoMarkEdited           = bitLShift(1, 16)
ImGuiItemFlags.NoFocus                = bitLShift(1, 17)

ImGuiItemFlags.Inputable            = bitLShift(1, 20)
ImGuiItemFlags.HasSelectionUserData = bitLShift(1, 21)
ImGuiItemFlags.IsMultiSelect        = bitLShift(1, 22)

ImGuiItemFlags.Default_ = bitOr(ImGuiItemFlags.AutoClosePopups, ImGuiItemFlags.LiveEditOnInputText)

--- @enum ImDrawTextFlags
ImDrawTextFlags =
{
    None           = 0,
    CpuFineClip    = bitLShift(1, 0),
    WrapKeepBlanks = bitLShift(1, 1),
    StopOnNewLine  = bitLShift(1, 2)
}

--- @enum ImGuiFocusRequestFlags
ImGuiFocusRequestFlags =
{
    None                = 0,
    RestoreFocusedChild = bitLShift(1, 0),
    UnlessBelowModal    = bitLShift(1, 1)
}

--- @enum ImGuiTextFlags
ImGuiTextFlags =
{
    None                       = 0,
    NoWidthForLargeClippedText = bitLShift(1, 0)
}

--- @enum ImWcharClass
ImWcharClass =
{
    Blank = 0,
    Punct = 1,
    Other = 2
}

--- @class ImVec1
--- @field x number
local IM_VEC1 = {}
IM_VEC1.__index = IM_VEC1

local function ImVec1(x) return setmetatable({x = x or 0}, IM_VEC1) end

function IM_VEC1:__tostring() return string.format("ImVec1(%g)", self.x) end

--- @param dest ImVec1
--- @param src  ImVec1
function ImVec1_Copy(dest, src)
    dest.x = src.x
end

--- @class ImRect
--- @field [1] ImVec2
--- @field [2] ImVec2
--- @field Min ImVec2
--- @field Max ImVec2
local IM_RECT = {}

--- @param t ImRect
--- @param k string
IM_RECT.__index = function(t, k)
    local method = IM_RECT[k]
    if method ~= nil  then return method end
    if     k == "Min" then return rawget(t, 1)
    elseif k == "Max" then return rawget(t, 2)
    end
end

--- @param t ImRect
--- @param k string
--- @param v ImVec2
IM_RECT.__newindex = function(t, k, v)
    if     k == "Min" then ImVec2_Copy(rawget(t, 1), v)
    elseif k == "Max" then ImVec2_Copy(rawget(t, 2), v)
    else IM_ASSERT(false)
    end
end

--- @return ImRect
--- @nodiscard
function ImRect(a, b, c, d) if c and d then return setmetatable({ ImVec2(a, b), ImVec2(c, d) }, IM_RECT) end return setmetatable({ ImVec2(a and a.x or 0, a and a.y or 0), ImVec2(b and b.x or 0, b and b.y or 0) }, IM_RECT) end

function IM_RECT:__eq(other) return self[1] == other[1] and self[2] == other[2] end
function IM_RECT:__tostring() return string.format("ImRect(Min: %g,%g, Max: %g,%g)", self.Min.x, self.Min.y, self.Max.x, self.Max.y) end

--- @param p ImRect|ImVec2
function IM_RECT:Contains(p)
    if p.Min then
        --- @cast p ImRect
        return p[1][1] >= self[1][1] and p[2][1] <= self[2][1] and p[1][2] >= self[1][2] and p[2][2] <= self[2][2]
    else
        --- @cast p ImVec2
        return p[1] >= self[1][1] and p[2] >= self[1][2] and p[1] < self[2][1] and p[2] < self[2][2]
    end
end

--- @param p   ImVec2
--- @param pad ImVec2
function IM_RECT:ContainsWithPad(p, pad)
    return p[1] >= self[1][1] - pad[1] and p[2] >= self[1][2] - pad[2] and p[1] < self[2][1] + pad[1] and p[2] < self[2][2] + pad[2]
end

--- @param r ImRect
function IM_RECT:Overlaps(r)
    return self[1][1] <= r[2][1] and self[2][1] >= r[1][1] and self[1][2] <= r[2][2] and self[2][2] >= r[1][2]
end

--- @nodiscard
function IM_RECT:GetCenter() return ImVec2((self[1][1] + self[2][1]) * 0.5, (self[1][2] + self[2][2]) * 0.5) end
function IM_RECT:GetWidth() return self[2][1] - self[1][1] end
function IM_RECT:GetHeight() return self[2][2] - self[1][2] end
--- @nodiscard
function IM_RECT:GetSize() return ImVec2(self[2][1] - self[1][1], self[2][2] - self[1][2]) end

--- @nodiscard
function IM_RECT:GetTL() return ImVec2(self[1][1], self[1][2]) end
--- @nodiscard
function IM_RECT:GetTR() return ImVec2(self[2][1], self[1][2]) end
--- @nodiscard
function IM_RECT:GetBL() return ImVec2(self[1][1], self[2][2]) end
--- @nodiscard
function IM_RECT:GetBR() return ImVec2(self[2][1], self[2][2]) end

--- @param r ImRect
function IM_RECT:ClipWith(r)
    ImVec2_Copy(self[1], ImMax(self[1], r[1])); ImVec2_Copy(self[2], ImMin(self[2], r[2]))
end

--- @param r ImRect
function IM_RECT:ClipWithFull(r)
    ImVec2_Copy(self[1], ImClamp(self[1], r[1], r[2])); ImVec2_Copy(self[2], ImClamp(self[2], r[1], r[2]))
end

--- @param p ImRect|ImVec2
function IM_RECT:Add(p)
    if p.Min then
        --- @cast p ImRect
        if (self[1][1] > p[1][1]) then self[1][1] = p[1][1] end
        if (self[1][2] > p[1][2]) then self[1][2] = p[1][2] end
        if (self[2][1] < p[2][1]) then self[2][1] = p[2][1] end
        if (self[2][2] < p[2][2]) then self[2][2] = p[2][2] end
    else
        --- @cast p ImVec2
        if p[1] < self[1][1] then self[1][1] = p[1] end
        if p[2] < self[1][2] then self[1][2] = p[2] end
        if p[1] > self[2][1] then self[2][1] = p[1] end
        if p[2] > self[2][2] then self[2][2] = p[2] end
    end
end

--- @param amount float|ImVec2
function IM_RECT:Expand(amount)
    if     type(amount) == "number" then
        self[1][1] = self[1][1] - amount; self[1][2] = self[1][2] - amount
        self[2][1] = self[2][1] + amount; self[2][2] = self[2][2] + amount
    elseif type(amount) == "table"  then
        self[1][1] = self[1][1] - amount[1]; self[1][2] = self[1][2] - amount[2]
        self[2][1] = self[2][1] + amount[1]; self[2][2] = self[2][2] + amount[2]
    end
end

--- @nodiscard
function IM_RECT:ToVec4()
    return ImVec4(self[1][1], self[1][2], self[2][1], self[2][2])
end

--- @param d ImVec2
function IM_RECT:Translate(d)
    self[1][1] = self[1][1] + d[1]; self[1][2] = self[1][2] + d[2]
    self[2][1] = self[2][1] + d[1]; self[2][2] = self[2][2] + d[2]
end

--- @param dx float
function IM_RECT:TranslateX(dx)
    self[1][1] = self[1][1] + dx; self[2][1] = self[2][1] + dx
end

--- @param dy float
function IM_RECT:TranslateY(dy)
    self[1][2] = self[1][2] + dy; self[2][2] = self[2][2] + dy
end

function IM_RECT:IsInverted() return self[1][1] > self[2][1] or self[1][2] > self[2][2] end

function IM_RECT:GetArea() return (self[2][1] - self[1][1]) * (self[2][2] - self[1][2]) end

--- @nodiscard
function IM_RECT:AsVec4() return ImVec4(self[1][1], self[1][2], self[2][1], self[2][2]) end

--- @param dest ImRect
--- @param src  ImRect
function ImRect_Copy(dest, src)
    dest[1][1] = src[1][1]; dest[1][2] = src[1][2]
    dest[2][1] = src[2][1]; dest[2][2] = src[2][2]
end

--- @param dest ImRect
--- @param src  ImVec4
function ImRect_CopyFromV4(dest, src)
    dest[1][1] = src[1]; dest[1][2] = src[2]
    dest[2][1] = src[3]; dest[2][2] = src[4]
end

--- @param _ARRAY ImU32[]
--- @param _N     int
function IM_BITARRAY_TESTBIT(_ARRAY, _N)
    return bitAnd(_ARRAY[bitRShift(_N - 1, 5) + 1], bitLShift(1, bitAnd(_N - 1, 31))) ~= 0
end

--- @param _ARRAY ImU32[]
--- @param _N     int
function IM_BITARRAY_CLEARBIT(_ARRAY, _N)
    local idx = bitRShift(_N - 1, 5) + 1
    _ARRAY[idx] = bitAnd(_ARRAY[idx], bitNot(bitLShift(1, bitAnd(_N - 1, 31))))
end

--- @param arr ImU32[]
--- @param n   int
function ImBitArraySetBit(arr, n)
    local mask = bitLShift(1, bitAnd(n - 1, 31))
    local idx = bitRShift(n - 1, 5) + 1
    arr[idx] = bitOr(arr[idx], mask)
end

--- @alias ImBitArrayForNamedKeys ImBitArray

--- NOTE: This struct is expensive to create
--- @class ImBitArray<BITCOUNT, OFFSET>
--- @field Data ImU32[]

--- @param BITCOUNT int
--- @param OFFSET?  int
--- @return ImBitArray
function ImBitArray(BITCOUNT, OFFSET)
    if OFFSET == nil then OFFSET = 0 end

    local this = { Data = {} }
    local size = bitRShift(BITCOUNT + 31, 5)

    this.ClearAllBits = function(self) local data = self.Data; for i = 1, size do data[i] = 0 end end
    this.SetAllBits   = function(self) local data = self.Data; for i = 1, size do data[i] = 0xFFFFFFFF end end
    --- @param n int # 1-based
    --- @return boolean
    this.TestBit = function(self, n) n = n + OFFSET; IM_ASSERT(n >= 1 and n <= BITCOUNT); return IM_BITARRAY_TESTBIT(self.Data, n); end
    --- @param n int # 1-based
    this.SetBit  = function(self, n) n = n + OFFSET; IM_ASSERT(n >= 1 and n <= BITCOUNT); ImBitArraySetBit(self.Data, n); end

    this:ClearAllBits()

    return this
end

function MT.ImDrawList:PathClear() self._Path:clear() end

--- @param pos ImVec2
function MT.ImDrawList:PathLineTo(pos) self._Path:push_back(pos) end

function MT.ImDrawList:PathLineToMergeDuplicate(pos)
    local path_size = self._Path.Size
    if path_size == 0 or self._Path.Data[path_size].x ~= pos.x or self._Path.Data[path_size].y ~= pos.y then
        self._Path:push_back(pos)
    end
end

function MT.ImDrawList:PathFillConvex(col)
    self:AddConvexPolyFilled(self._Path.Data, self._Path.Size, col)
    self._Path.Size = 0
end

--- @param col        ImU32
--- @param thickness? float
--- @param flags?     ImDrawFlags
function MT.ImDrawList:PathStroke(col, thickness, flags)
    if not thickness then thickness = 1.0 end
    if not flags     then flags     = 0   end

    self:AddPolyline(self._Path.Data, self._Path.Size, col, thickness, flags)
    self._Path.Size = 0
end

--- @param col ImU32
function ImGui.SetNextItemColorMarker(col)
    local g = GImGui
    g.NextItemData.HasFlags = bitOr(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasColorMarker)
    g.NextItemData.ColorMarker = col
end

--- @class ImDrawListSharedData
--- @field TexUvWhitePixel       ImVec2
--- @field TexUvLines            ImVec4[]
--- @field FontAtlas             ImFontAtlas
--- @field Font                  ImFont
--- @field FontSize              float
--- @field FontScale             float
--- @field CurveTessellationTol  float
--- @field CircleTessellationMaxError float
--- @field InitialFringeScale    float
--- @field InitialFlags          ImDrawListFlags
--- @field ClipRectFullscreen?   ImVec4
--- @field TempBuffer            ImVector<ImVec2>
--- @field DrawLists             ImVector<ImDrawList>
--- @field Context?              ImGuiContext
--- @field ArcFastVtx            table<ImVec2>        # 1-based table
--- @field ArcFastRadiusCutoff   float
--- @field CircleSegmentCounts   table<int>           # 1-based table
MT.ImDrawListSharedData = {}
MT.ImDrawListSharedData.__index = MT.ImDrawListSharedData

--- @return ImDrawListSharedData
--- @nodiscard
function ImDrawListSharedData()
    local this = setmetatable({
        TexUvWhitePixel = nil,
        TexUvLines      = nil,
        FontAtlas       = nil,

        Font      = nil,
        FontSize  = 0,
        FontScale = 0,

        CurveTessellationTol  = 0,
        CircleTessellationMaxError = 0,
        InitialFringeScale    = 1,

        InitialFlags          = 0,
        ClipRectFullscreen    = nil,
        TempBuffer            = ImVector(ImVec2),
        DrawLists             = ImVector(),

        ArcFastVtx          = {},
        ArcFastRadiusCutoff = nil,
        CircleSegmentCounts = {},

        Context = nil
    }, MT.ImDrawListSharedData)

    for i = 1, IM_DRAWLIST_ARCFAST_TABLE_SIZE do
        local a = ((i - 1) * 2 * IM_PI) / IM_DRAWLIST_ARCFAST_TABLE_SIZE
        this.ArcFastVtx[i] = ImVec2(ImCos(a), ImSin(a))
    end

    return this
end

--- @class ImFontAtlasBuilder
--- @field PackContext              stbrp_context
--- @field PackNodes                ImVector<stbrp_node>
--- @field Rects                    ImVector<ImTextureRect>
--- @field RectsIndex               ImVector<ImFontAtlasRectEntry>
--- @field TempBuffer               ImVector<char>
--- @field RectsIndexFreeListStart  int
--- @field RectsPackedCount         int
--- @field RectsPackedSurface       int
--- @field RectsDiscardedCount      int
--- @field RectsDiscardedSurface    int
--- @field FrameCount               int
--- @field MaxRectSize              ImVec2
--- @field MaxRectBounds            ImVec2
--- @field LockDisableResize        bool
--- @field PreloadedAllGlyphsRanges bool
--- @field BakedPool                ImVector<ImFontBaked>
--- @field BakedMap                 table<ImGuiID, any>            # LUA: No ImGuiStorage
--- @field BakedDiscardedCount      int
--- @field PackIdMouseCursors       ImFontAtlasRectId
--- @field PackIdLinesTexData       ImFontAtlasRectId
MT.ImFontAtlasBuilder = {}
MT.ImFontAtlasBuilder.__index = MT.ImFontAtlasBuilder

--- @return ImFontAtlasBuilder
function ImFontAtlasBuilder()
    --- @type ImFontAtlasBuilder
    local this = setmetatable({}, MT.ImFontAtlasBuilder)

    this.PackContext              = nil -- struct stbrp_context_opaque { char data[80]; };
    this.PackNodes                = ImVector()
    this.Rects                    = ImVector()
    this.RectsIndex               = ImVector()
    this.TempBuffer               = ImVector()
    this.RectsIndexFreeListStart  = -1
    this.RectsPackedCount         = 0
    this.RectsPackedSurface       = 0
    this.RectsDiscardedCount      = 0
    this.RectsDiscardedSurface    = 0
    this.FrameCount               = -1
    this.MaxRectSize              = ImVec2()
    this.MaxRectBounds            = ImVec2()
    this.LockDisableResize        = false
    this.PreloadedAllGlyphsRanges = false

    this.BakedPool           = ImVector() -- ImStableVector<ImFontBaked,32>
    this.BakedMap            = {}
    this.BakedDiscardedCount = 0

    this.PackIdMouseCursors = -1
    this.PackIdLinesTexData = -1

    return this
end

--- @class ImFontStackData
--- @field Font                  ImFont
--- @field FontSizeBeforeScaling float
--- @field FontSizeAfterScaling  float

--- @return ImFontStackData
--- @param font                     ImFont
--- @param font_size_before_scaling float
--- @param font_size_after_scaling  float
--- @nodiscard
function ImFontStackData(font, font_size_before_scaling, font_size_after_scaling)
    return {
        Font                  = font,
        FontSizeBeforeScaling = font_size_before_scaling,
        FontSizeAfterScaling  = font_size_after_scaling
    }
end

--- `GetVarPtr()` is currently only used on `g.Style` in Dear ImGui, and we don't have pointers!
--- @class ImGuiStyleVarInfo
--- @field Count    ImU32
--- @field DataType ImGuiDataType
--- @field Key      string        # key in parent structure. Note that the cpp Dear ImGui uses `ImU32 Offset`!

--- @param count     ImU32
--- @param data_type ImGuiDataType
--- @param key       string
--- @return ImGuiStyleVarInfo
--- @nodiscard
function ImGuiStyleVarInfo(count, data_type, key)
    return { Count = count, DataType = data_type, Key = key }
end

--- @class ImGuiStyleMod
--- @field VarIdx       ImGuiStyleVar
--- @field BackupVal    table

--- @param idx ImGuiStyleVar
--- @param v   int|float|ImVec2
function ImGuiStyleMod(idx, v)
    local this = { VarIdx = idx, BackupVal = {nil, nil} }
    --- @cast this ImGuiStyleMod

    if type(v) == "number" then
        this.BackupVal[1] = v
    else -- ImVec2
        this.BackupVal[1] = v.x; this.BackupVal[2] = v.y
    end

    return this
end

--- Type information associated to one ImGuiDataType. Retrieve with DataTypeGetInfo()
--- @class ImGuiDataTypeInfo
--- @field Size     size_t # Size in bytes
--- @field Name     string # Short descriptive name for the type, for debugging
--- @field PrintFmt string # Default printf format for the type
--- @field ScanFmt  string # Default scanf format for the type

--- @class ImGuiLastItemData
--- @field ID          ImGuiID
--- @field ItemFlags   ImGuiItemFlags
--- @field StatusFlags ImGuiItemStatusFlags
--- @field Rect        ImRect
--- @field NavRect     ImRect
--- @field DisplayRect ImRect
--- @field ClipRect    ImRect
--- @field Shortcut    ImGuiKeyChord

--- @return ImGuiLastItemData
--- @nodiscard
function ImGuiLastItemData()
    return {
        ID          = 0,
        ItemFlags   = 0,
        StatusFlags = 0,
        Rect        = ImRect(),
        NavRect     = ImRect(),

        DisplayRect = ImRect(),
        ClipRect    = ImRect(),
        Shortcut    = 0
    }
end

--- @param dest ImGuiLastItemData
--- @param src  ImGuiLastItemData
function ImGuiLastItemData_Copy(dest, src)
    dest.ID = src.ID
    dest.ItemFlags = src.ItemFlags
    dest.StatusFlags = src.StatusFlags
    ImRect_Copy(dest.Rect, src.Rect)
    ImRect_Copy(dest.NavRect, src.NavRect)
    ImRect_Copy(dest.DisplayRect, src.DisplayRect)
    ImRect_Copy(dest.ClipRect, src.ClipRect)
    dest.Shortcut = src.Shortcut
end

--- @class ImGuiTreeNodeStackData
--- @field ID                   ImGuiID
--- @field TreeFlags            ImGuiTreeNodeFlags
--- @field ItemFlags            ImGuiItemFlags
--- @field NavRect              ImRect
--- @field DrawLinesX1          float
--- @field DrawLinesToNodesY2   float
--- @field DrawLinesTableColumn ImGuiTableColumnIdx

--- @return ImGuiTreeNodeStackData
--- @nodiscard
local function ImGuiTreeNodeStackData()
    return {
        ID                   = nil,
        TreeFlags            = nil,
        ItemFlags            = nil,
        NavRect              = ImRect(),
        DrawLinesX1          = nil,
        DrawLinesToNodesY2   = nil,
        DrawLinesTableColumn = nil
    }
end

--- @class ImGuiNextItemData
--- @field HasFlags          ImGuiNextItemDataFlags
--- @field ItemFlagsSet      ImGuiItemFlags
--- @field FocusScopeId      ImGuiID
--- @field SelectionUserData any
--- @field Width             number
--- @field Shortcut          ImGuiKeyChord
--- @field ShortcutFlags     ImGuiInputFlags
--- @field OpenVal           boolean
--- @field OpenCond          ImGuiCond
--- @field RefVal            any
--- @field StorageId         ImGuiID
--- @field ColorMarker       ImU32
local IMGUI_NEXT_ITEM_DATA = {}
IMGUI_NEXT_ITEM_DATA.__index = IMGUI_NEXT_ITEM_DATA

function IMGUI_NEXT_ITEM_DATA:ClearFlags()
    self.HasFlags = ImGuiNextItemDataFlags.None
    self.ItemFlagsSet = ImGuiItemFlags.None
end

--- @return ImGuiNextItemData
--- @nodiscard
function ImGuiNextItemData()
    return setmetatable({
        HasFlags          = 0,
        ItemFlagsSet      = 0,

        FocusScopeId      = 0,
        SelectionUserData = -1,
        Width             = 0.0,
        Shortcut          = 0,
        ShortcutFlags     = 0,
        OpenVal           = false,
        OpenCond          = 0,
        RefVal            = 0,
        StorageId         = 0,
        ColorMarker       = 0
    }, IMGUI_NEXT_ITEM_DATA)
end

--- @class ImGuiNextWindowData
--- @field HasFlags             ImGuiNextWindowDataFlags
--- @field PosCond              ImGuiCond
--- @field SizeCond             ImGuiCond
--- @field CollapsedCond        ImGuiCond
--- @field PosVal               ImVec2?
--- @field PosPivotVal          ImVec2?
--- @field SizeVal              ImVec2?
--- @field ContentSizeVal       ImVec2?
--- @field ScrollVal            ImVec2?
--- @field WindowFlags          ImGuiWindowFlags?
--- @field ChildFlags           ImGuiChildFlags?
--- @field CollapsedVal         boolean?
--- @field SizeConstraintRect   ImRect?
--- @field SizeCallback         function?
--- @field SizeCallbackUserData any
--- @field BgAlphaVal           number?
--- @field MenuBarOffsetMinVal  ImVec2?
--- @field RefreshFlagsVal      int?
local IMGUI_NEXT_WINDOW_DATA = {}
IMGUI_NEXT_WINDOW_DATA.__index = IMGUI_NEXT_WINDOW_DATA

function IMGUI_NEXT_WINDOW_DATA:ClearFlags()
    self.HasFlags = ImGuiNextWindowDataFlags.None
end

--- @return ImGuiNextWindowData
--- @nodiscard
function ImGuiNextWindowData()
    return setmetatable({
        HasFlags = 0,

        PosCond              = 0,
        SizeCond             = 0,
        CollapsedCond        = 0,
        PosVal               = ImVec2(),
        PosPivotVal          = ImVec2(),
        SizeVal              = ImVec2(),
        ContentSizeVal       = ImVec2(),
        ScrollVal            = ImVec2(),
        WindowFlags          = nil,
        ChildFlags           = nil,
        WindowFlagsSet       = 0,
        WindowFlagsClear     = 0,
        ChildFlagsSet        = 0,
        ChildFlagsClear      = 0,
        ViewportId           = 0,
        DockId               = 0,
        DockCond             = 0,
        PosUndock            = false,
        WindowClass          = nil,
        CollapsedVal         = nil,
        SizeConstraintRect   = nil,
        SizeCallback         = nil,
        SizeCallbackUserData = nil,
        BgAlphaVal           = nil,
        MenuBarOffsetMinVal  = ImVec2(),
        RefreshFlagsVal      = nil
    }, IMGUI_NEXT_WINDOW_DATA)
end

--- @enum ImGuiWindowBgClickFlags
ImGuiWindowBgClickFlags = {
    None = 0,
    Move = bitLShift(1, 0),
}

--- @enum ImGuiNextWindowDataFlags
ImGuiNextWindowDataFlags = {
    None              = 0,
    HasPos            = bitLShift(1, 0),
    HasSize           = bitLShift(1, 1),
    HasContentSize    = bitLShift(1, 2),
    HasCollapsed      = bitLShift(1, 3),
    HasSizeConstraint = bitLShift(1, 4),
    HasFocus          = bitLShift(1, 5),
    HasBgAlpha        = bitLShift(1, 6),
    HasScroll         = bitLShift(1, 7),
    HasWindowFlags    = bitLShift(1, 8),
    HasChildFlags     = bitLShift(1, 9),
    HasRefreshPolicy  = bitLShift(1, 10),
    HasViewport       = bitLShift(1, 11),
    HasDock           = bitLShift(1, 12),
    HasWindowClass    = bitLShift(1, 13)
}

--- @enum ImGuiLayoutType
ImGuiLayoutType =
{
    Horizontal = 0,
    Vertical   = 1
}

--- @enum ImGuiSeparatorFlags
ImGuiSeparatorFlags =
{
    None           = 0,
    Horizontal     = bitLShift(1, 0), -- Axis default to current layout type, so generally Horizontal unless e.g. in a menu bar
    Vertical       = bitLShift(1, 1),
    SpanAllColumns = bitLShift(1, 2)  -- Make separator cover all columns of a legacy Columns() set
}

--- @class ImGuiStyle
MT.ImGuiStyle = {}
MT.ImGuiStyle.__index = MT.ImGuiStyle

--- @return ImGuiStyle
--- @nodiscard
function ImGuiStyle()
    --- @type ImGuiStyle
    local this = {
        FontSizeBase  = 0.0,
        FontScaleMain = 1.0,
        FontScaleDpi  = 1.0,

        Alpha = 1.0,
        DisabledAlpha = 0.60,

        FramePadding = ImVec2(4, 3),
        FrameRounding = 0.0,
        FrameBorderSize = 0.0,
        WindowPadding = ImVec2(8, 8),

        TouchExtraPadding = ImVec2(0, 0),
        IndentSpacing = 21.0,

        WindowRounding = 0,
        WindowBorderSize = 1,

        ScrollbarSize     = 14.0,
        ScrollbarRounding = 9.0,
        ScrollbarPadding  = 2.0,
        GrabMinSize = 12.0,
        GrabRounding = 0.0,
        ImageRounding = 0.0,
        ImageBorderSize = 0.0,

        WindowBorderHoverPadding = 4.0,

        TreeLinesFlags = ImGuiTreeNodeFlags.DrawLinesNone,
        TreeLinesSize  = 1.0,
        TreeLinesRounding = 0.0,
        MenuItemRounding = 0.0,
        SelectableRounding = 0.0,

        ColorMarkerSize = 3.0,
        ColorButtonPosition = ImGuiDir.Right,

        InputTextCursorSize = 1.0,
        SeparatorSize           = 1.0,
        SeparatorTextBorderSize = 3.0,
        SeparatorTextAlign      = ImVec2(0.0, 0.5),
        SeparatorTextPadding    = ImVec2(20.0, 3.0),

        DisplaySafeAreaPadding = ImVec2(3, 3),
        DisplayWindowPadding = ImVec2(19, 19),

        AntiAliasedLines = true,
        AntiAliasedLinesUseTex = true,
        AntiAliasedFill = true,

        CurveTessellationTol       = 1.25,
        CircleTessellationMaxError = 0.30,

        HoverStationaryDelay = 0.15,
        HoverDelayShort = 0.15,
        HoverDelayNormal = 0.40,

        Colors = {},

        ButtonTextAlign = ImVec2(0.5, 0.5),
        SelectableTextAlign = ImVec2(0.0, 0.0),

        WindowMinSize = ImVec2(32, 32),
        WindowTitleAlign = ImVec2(0.0, 0.5),
        WindowMenuButtonPosition = ImGuiDir.Left,
        ChildRounding = 0.0,
        ChildBorderSize = 1.0,
        PopupRounding = 0.0,
        PopupBorderSize = 1.0,

        DockingSeparatorSize = 2.0,
        DockingNodeHasCloseButton = true,
        MouseCursorScale = 1.0,

        ItemSpacing = ImVec2(8, 4),
        ItemInnerSpacing = ImVec2(4, 4),
        CellPadding = ImVec2(4, 2),

        ColumnsMinSpacing = 6.0,

        LogSliderDeadzone = 4.0,

        TabRounding = 5.0,
        TabBorderSize = 0.0,
        TabMinWidthBase = 1.0,
        TabMinWidthShrink = 80.0,
        TabCloseButtonMinWidthSelected = -1.0,
        TabCloseButtonMinWidthUnselected = 0.0,
        TabBarBorderSize = 1.0,
        TabBarOverlineSize = 1.0,
        TableAngledHeadersAngle = 35.0 * (IM_PI / 180.0),
        TableAngledHeadersTextAlign = ImVec2(0.5, 0.0),

        DragDropTargetRounding = 0.0,
        DragDropTargetBorderSize = 2.0,
        DragDropTargetPadding = 3.0,

        HoverFlagsForTooltipMouse = bitOr(ImGuiHoveredFlags.Stationary, ImGuiHoveredFlags.DelayShort, ImGuiHoveredFlags.AllowWhenDisabled),
        HoverFlagsForTooltipNav = bitOr(ImGuiHoveredFlags.NoSharedDelay, ImGuiHoveredFlags.DelayNormal, ImGuiHoveredFlags.AllowWhenDisabled),

        -- [Internal]
        _MainScale = 1.0,
        _NextFrameFontSizeBase = 0.0
    }

    ImGui.StyleColorsDark(this)

    setmetatable(this, MT.ImGuiStyle)

    return this
end

--- @class ImGuiWindowStackData

--- @return ImGuiWindowStackData
--- @nodiscard
function ImGuiWindowStackData()
    return {
        Window                              = nil,
        ParentLastItemDataBackup            = ImGuiLastItemData(),
        StackSizesInBegin                   = nil,
        DisabledOverrideReenable            = nil,
        DisabledOverrideReenableAlphaBackup = nil
    }
end

--- @class ImGuiComboPreviewData
--- @field PreviewRect                  ImRect
--- @field BackupCursorPos              ImVec2
--- @field BackupCursorMaxPos           ImVec2
--- @field BackupCursorPosPrevLine      ImVec2
--- @field BackupPrevLineTextBaseOffset float
--- @field BackupLayout                 ImGuiLayoutType

--- @return ImGuiComboPreviewData
--- @nodiscard
local function ImGuiComboPreviewData()
    return {
        PreviewRect                  = ImRect(),
        BackupCursorPos              = ImVec2(),
        BackupCursorMaxPos           = ImVec2(),
        BackupCursorPosPrevLine      = ImVec2(),
        BackupPrevLineTextBaseOffset = 0.0,
        BackupLayout                 = 0
    }
end

--- @alias IMSTB_TEXTEDIT_STRING ImGuiInputTextState

--- @alias ImStbTexteditState STB_TexteditState

--- @class ImGuiInputTextState
--- @field Ctx                  ImGuiContext        # parent UI context (needs to be set explicitly by parent)
--- @field Stb                  ImStbTexteditState  # State for stb_textedit.lua
--- @field Flags                ImGuiInputTextFlags
--- @field ID                   ImGuiID             # widget id owning the text state
--- @field TextLen              int                 # UTF-8 length of the string in TextA (in bytes)
--- @field TextSrc              ImStringBuffer      # == TextA.Data unless read-only, in which case == buf passed to InputText(). For _ReadOnly fields, pointer will be null outside the InputText() call
--- @field TextA                ImVector<char>      # main UTF8 buffer. TextA.Size is a buffer size! Should always be >= buf_size passed by user (and of course >= CurLenA + 1)
--- @field TextToRevertTo       ImVector<char>      # value to revert to when pressing Escape = backup of end-user buffer at the time of focus (in UTF-8, unaltered)
--- @field CallbackTextBackup   ImVector<char>      # temporary storage for callback to support automatic reconcile of undo-stack
--- @field BufCapacity          int                 # end-user buffer capacity (include zero terminator)
--- @field Scroll               ImVec2              # horizontal offset (managed manually) + vertical scrolling (pulled from child window's own Scroll.y)
--- @field LineCount            int                 # last line count (solely for debugging)
--- @field WrapWidth            float               # word-wrapping width
--- @field CursorAnim           float               # timer for cursor blink, reset on every user action so the cursor reappears immediately
--- @field CursorFollow         bool                # set when we want scrolling to follow the current cursor position (not always!)
--- @field CursorCenterY        bool                # set when we want scrolling to be centered over the cursor position (while resizing a word-wrapping field)
--- @field SelectedAllMouseLock bool                # after a double-click to select all, we ignore further mouse drags to update selection
--- @field EditedBefore         bool                # edited since activated
--- @field EditedThisFrame      bool                # edited this frame
MT.ImGuiInputTextState = {}
MT.ImGuiInputTextState.__index = MT.ImGuiInputTextState

local function ImGuiInputTextState()
    local this = {
        Ctx   = nil,
        Stb   = STB_TexteditState(), -- FIXME: no global!
        Flags = 0,
        ID    = 0,

        TextLen            = 0,
        TextSrc            = nil,
        TextA              = ImVector(),
        TextToRevertTo     = ImVector(),
        CallbackTextBackup = ImVector(),

        BufCapacity = 0,
        Scroll      = ImVec2(),
        LineCount   = 0,
        WrapWidth   = 0.0,

        CursorAnim    = 0.0,
        CursorFollow  = false,
        CursorCenterY = false,
        SelectedAllMouseLock = false,
        EditedBefore = false,
        EditedThisFrame = false,
    }

    return setmetatable(this, MT.ImGuiInputTextState)
end

--- @class ImGuiInputTextDeactivatedState
--- @field ID          ImGuiID        # widget id owning the text state (which just got deactivated)
--- @field ElapseFrame int
--- @field TextA       ImVector<char> # text buffer
local IMGUI_INPUT_TEXT_DEACTIVATED_STATE = {}
IMGUI_INPUT_TEXT_DEACTIVATED_STATE.__index = IMGUI_INPUT_TEXT_DEACTIVATED_STATE

function IMGUI_INPUT_TEXT_DEACTIVATED_STATE:ClearFreeMemory()
    self.ID = 0
    self.ElapseFrame = 0
    self.TextA:clear()
end

--- @return ImGuiInputTextDeactivatedState
--- @nodiscard
local function ImGuiInputTextDeactivatedState()
    return setmetatable({
        ID          = 0,
        ElapseFrame = 0,
        TextA       = ImVector()
    }, IMGUI_INPUT_TEXT_DEACTIVATED_STATE)
end

--- @alias ImGuiKeyRoutingIndex ImS16

--- @class ImGuiKeyRoutingData
--- @field NextEntryIndex   ImGuiKeyRoutingIndex
--- @field Mods             ImU16
--- @field RoutingCurrScore ImU16
--- @field RoutingNextScore ImU16
--- @field RoutingCurr      ImGuiID
--- @field RoutingNext      ImGuiID

--- @return ImGuiKeyRoutingData
--- @nodiscard
function ImGuiKeyRoutingData()
    return {
        NextEntryIndex = -1,
        Mods = 0,
        RoutingCurrScore = 0,
        RoutingNextScore = 0,
        RoutingCurr = ImGuiKeyOwner_NoOwner,
        RoutingNext = ImGuiKeyOwner_NoOwner
    }
end

--- @class ImGuiKeyRoutingTable
--- @field Index       ImGuiKeyRoutingIndex[]
--- @field Entries     ImVector<ImGuiKeyRoutingData>
--- @field EntriesNext ImVector<ImGuiKeyRoutingData>
local _ImGuiKeyRoutingTable = {}
_ImGuiKeyRoutingTable.__index = _ImGuiKeyRoutingTable

function _ImGuiKeyRoutingTable:Clear()
    for n = 1, ImGuiKey.NamedKey_COUNT do self.Index[n] = -1 end
    self.Entries:clear()
    self.EntriesNext:clear()
end

--- @return ImGuiKeyRoutingTable
local function ImGuiKeyRoutingTable()
    local this = setmetatable({
        Index       = {},
        Entries     = ImVector(),
        EntriesNext = ImVector()
    }, _ImGuiKeyRoutingTable)

    this:Clear()

    return this
end

--- @class ImGuiTextIndex
--- @field Offsets   ImVector<int>
--- @field EndOffset int
local IMGUI_TEXT_INDEX = {}
IMGUI_TEXT_INDEX.__index = IMGUI_TEXT_INDEX

function IMGUI_TEXT_INDEX:clear() self.Offsets:clear(); self.EndOffset = 0; end

function IMGUI_TEXT_INDEX:get_line_begin(base, n)
    return base + (self.Offsets.Size ~= 0 and self.Offsets[n] or 0)
end

function IMGUI_TEXT_INDEX:get_line_end(base, n)
    return base + ((n + 1 < self.Offsets.Size) and (self.Offsets[n + 1] - 1) or self.EndOffset)
end

--- @return ImGuiTextIndex
local function ImGuiTextIndex()
    return setmetatable({ Offsets = ImVector(), EndOffset = 0 }, IMGUI_TEXT_INDEX)
end

--- @class ImGuiDebugAllocEntry
--- @field FrameCount int
--- @field AllocCount int
--- @field FreeCount  int

--- @return ImGuiDebugAllocEntry
local function ImGuiDebugAllocEntry()
    return { FrameCount = 0, AllocCount = 0, FreeCount = 0 }
end

--- @class ImGuiDebugAllocInfo
--- @field TotalAllocCount int
--- @field TotalFreeCount  int
--- @field LastEntriesIdx  ImS16
--- @field LastEntriesBuf  ImGuiDebugAllocEntry[]

--- @return ImGuiDebugAllocInfo
local function ImGuiDebugAllocInfo()
    local this = {
        TotalAllocCount = 0,
        TotalFreeCount = 0,
        LastEntriesIdx = 1,
        LastEntriesBuf = {nil, nil, nil, nil, nil, nil},
    }

    for i = 1, 6 do
        this.LastEntriesBuf[i] = ImGuiDebugAllocEntry()
    end

    return this
end

--- @class ImGuiMetricsConfig

--- @return ImGuiMetricsConfig
local function ImGuiMetricsConfig()
    return
    {
        HighlightMonitorIdx = -1,
        HighlightViewportID = 0,
    }
end

--- @class ImGuiNavItemData
--- @field Window             ImGuiWindow?
--- @field ID                 ImGuiID
--- @field FocusScopeId       ImGuiID
--- @field RectRel            ImRect
--- @field ItemFlags          ImGuiItemFlags
--- @field SelectionUserData  ImGuiSelectionUserData
--- @field DistBox            float
--- @field DistCenter         float
--- @field DistAxial          float
local IMGUI_NAV_ITEM_DATA = {}
IMGUI_NAV_ITEM_DATA.__index = IMGUI_NAV_ITEM_DATA

function IMGUI_NAV_ITEM_DATA:Clear()
    self.Window             = nil
    self.ID                 = 0
    self.FocusScopeId       = 0
    self.ItemFlags          = 0
    self.SelectionUserData  = ImGuiSelectionUserData_Invalid
    self.DistBox    = FLT_MAX
    self.DistCenter = FLT_MAX
    self.DistAxial  = FLT_MAX
end

--- @return ImGuiNavItemData
local function ImGuiNavItemData()
    local this = setmetatable({ }, IMGUI_NAV_ITEM_DATA)
    this.RectRel = ImRect()
    this:Clear()
    return this
end

--- @class ImGuiContext
--- @field Initialized                        bool
--- @field WithinFrameScope                   bool
--- @field WithinFrameScopeWithImplicitWindow bool
--- @field FrameCount                         int
--- @field FrameCountEnded                    int
--- @field CurrentWindow                      ImGuiWindow
--- @field HoveredWindow                      ImGuiWindow
--- @field Style                              ImGuiStyle
--- @field FontAtlases                        ImVector<ImFontAtlas>
--- @field Font                               ImFont
--- @field FontBaked                          ImFontBaked?
--- @field FontSize                           float
--- @field FontSizeBase                       float
--- @field FontBakedScale                     float
--- @field FontRasterizerDensity              float
--- @field DrawListSharedData                 ImDrawListSharedData
--- @field NextItemData                       ImGuiNextItemData
--- @field LastItemData                       ImGuiLastItemData
--- @field NextWindowData                     ImGuiNextWindowData
--- @field WithinEndChildID                   ImGuiID
--- @field WithinEndPopupID                   ImGuiID
--- @field StyleVarStack                      ImVector
--- @field AnyIdHasBeenEditedThisFrame        bool
--- @field ActiveId                           ImGuiID
--- @field ActiveIdMouseButton                ImS8
--- @field Windows                            ImVector<ImGuiWindow>
--- @field WindowsFocusOrder                  ImVector<ImGuiWindow>
--- @field WindowsTempSortBuffer              ImVector<ImGuiWindow>
--- @field CurrentWindowStack                 ImVector<ImGuiWindowStackData>
--- @field FocusScopeStack                    ImVector<ImGuiFocusScopeData>
--- @field ItemFlagsStack                     ImVector<ImGuiItemFlags>
--- @field GroupStack                         ImVector<ImGuiGroupData>
--- @field OpenPopupStack                     ImVector<ImGuiPopupData>
--- @field BeginPopupStack                    ImVector<ImGuiPopupData>
--- @field TreeNodeStack                      ImVector<ImGuiTreeNodeStackData>
--- @field IO                                 ImGuiIO
--- @field PlatformIO                         ImGuiPlatformIO
--- @field Viewports                          ImVector<ImGuiViewportP>
--- @field DebugLogFlags                      ImGuiDebugLogFlags
--- @field DebugFlashStyleColorIdx            ImGuiCol
--- @field ColorEditCurrentID                 ImGuiID                        # Set temporarily while inside of the parent-most ColorEdit4/ColorPicker4 (because they call each others)
--- @field ColorEditSavedID                   ImGuiID                        # ID we are saving/restoring HS for
--- @field ColorEditSavedHue                  float                          # Backup of last Hue associated to LastColor, so we can restore Hue in lossy RGB<>HSV round trips
--- @field ColorEditSavedSat                  float                          # Backup of last Saturation associated to LastColor, so we can restore Saturation in lossy RGB<>HSV round trips
--- @field ColorEditSavedColor                ImU32                          # RGB value with alpha set to 0
--- @field ColorPickerRef                     ImVec4                         # Initial/reference color at the time of opening the color picker
--- @field MenusIdSubmittedThisFrame          ImVector<ImGuiID>
--- @field InputTextState                     ImGuiInputTextState
--- @field InputTextLineIndex                 ImGuiTextIndex
--- @field InputTextDeactivatedState          ImGuiInputTextDeactivatedState
--- @field InputTextPasswordFontBackupBaked   ImFontBaked
--- @field KeysMayBeCharInput                 ImBitArrayForNamedKeys
--- @field KeysOwnerData                      ImGuiKeyOwnerData[]
--- @field KeysRoutingTable                   ImGuiKeyRoutingTable
--- @field NavFocusRoute                      ImVector<ImGuiFocusScopeData>
--- @field PlatformImeData                    ImGuiPlatformImeData
--- @field PlatformImeDataPrev                ImGuiPlatformImeData
--- @field UserTextures                       ImVector<ImTextureData>
--- @field DebugMetricsConfig                 ImGuiMetricsConfig
--- @field DebugAllocInfo                     ImGuiDebugAllocInfo
--- @field TempBuffer                         ImVector<char>

----------------------------------------------------------------
-- [SECTION] Tab bar, Tab item support (public flags from imgui.h + private extensions)
----------------------------------------------------------------

--- @enum ImGuiTabBarFlags
ImGuiTabBarFlags = {
    None                         = 0,
    Reorderable                  = bitLShift(1, 0),
    AutoSelectNewTabs            = bitLShift(1, 1),
    TabListPopupButton           = bitLShift(1, 2),
    NoCloseWithMiddleMouseButton = bitLShift(1, 3),
    NoTabListScrollingButtons    = bitLShift(1, 4),
    NoTooltip                    = bitLShift(1, 5),
    DrawSelectedOverline         = bitLShift(1, 6),
    FittingPolicyMixed           = bitLShift(1, 7),
    FittingPolicyShrink          = bitLShift(1, 8),
    FittingPolicyScroll          = bitLShift(1, 9),
    -- Private
    DockNode                     = bitLShift(1, 20),
    IsFocused                    = bitLShift(1, 21),
    SaveSettings                 = bitLShift(1, 22),
}
ImGuiTabBarFlags.FittingPolicyMask_       = bitOr(ImGuiTabBarFlags.FittingPolicyMixed, ImGuiTabBarFlags.FittingPolicyShrink, ImGuiTabBarFlags.FittingPolicyScroll)
ImGuiTabBarFlags.FittingPolicyDefault_    = ImGuiTabBarFlags.FittingPolicyMixed
ImGuiTabBarFlags.FittingPolicyResizeDown  = ImGuiTabBarFlags.FittingPolicyShrink

--- @enum ImGuiTabItemFlags
ImGuiTabItemFlags = {
    None                         = 0,
    UnsavedDocument              = bitLShift(1, 0),
    SetSelected                  = bitLShift(1, 1),
    NoCloseWithMiddleMouseButton = bitLShift(1, 2),
    NoPushId                     = bitLShift(1, 3),
    NoTooltip                    = bitLShift(1, 4),
    NoReorder                    = bitLShift(1, 5),
    Leading                      = bitLShift(1, 6),
    Trailing                     = bitLShift(1, 7),
    NoAssumedClosure             = bitLShift(1, 8),
    -- Private
    NoCloseButton                = bitLShift(1, 20),
    Button                       = bitLShift(1, 21),
    Invisible                    = bitLShift(1, 22),
    Unsorted                     = bitLShift(1, 23),
}
ImGuiTabItemFlags.SectionMask_ = bitOr(ImGuiTabItemFlags.Leading, ImGuiTabItemFlags.Trailing)

-- Storage for one active tab item. In this port the label is stored in `Name` (C++ uses NameOffset into TabBar.TabsNames)
--- @class ImGuiTabItem
--- @return ImGuiTabItem
function ImGuiTabItem()
    return {
        ID = 0, Flags = 0, Window = nil,
        LastFrameVisible = -1, LastFrameSelected = -1,
        Offset = 0.0, Width = 0.0, ContentWidth = 0.0, RequestedWidth = -1.0,
        NameOffset = -1, Name = nil,
        BeginOrder = -1,        -- 0-based
        IndexDuringLayout = -1, -- 0-based
        WantClose = false,
    }
end

-- Storage for a tab bar. Tabs: ImVector of ImGuiTabItem tables (references; "pointers" stay valid across reorders)
--- @class ImGuiTabBar
--- @return ImGuiTabBar
function ImGuiTabBar()
    return {
        Window = nil, Tabs = ImVector(), Flags = 0, ID = 0,
        SelectedTabId = 0, NextSelectedTabId = 0, NextScrollToTabId = 0, VisibleTabId = 0,
        CurrFrameVisible = -1, PrevFrameVisible = -1,
        BarRect = ImRect(), BarRectPrevWidth = 0.0,
        CurrTabsContentsHeight = 0.0, PrevTabsContentsHeight = 0.0,
        WidthAllTabs = 0.0, WidthAllTabsIdeal = 0.0,
        ScrollingAnim = 0.0, ScrollingTarget = 0.0, ScrollingTargetDistToVisibility = 0.0, ScrollingSpeed = 0.0,
        ScrollingRectMinX = 0.0, ScrollingRectMaxX = 0.0, SeparatorMinX = 0.0, SeparatorMaxX = 0.0,
        ReorderRequestTabId = 0, ReorderRequestOffset = 0, BeginCount = 0,
        WantLayout = false, VisibleTabWasSubmitted = false, TabsAddedNew = false, ScrollButtonEnabled = false,
        TabsActiveCount = 0,
        LastTabItemIdx = -1, -- 0-based
        ItemSpacingY = 0.0, FramePadding = ImVec2(), BackupCursorPos = ImVec2(),
    }
end

--- @class ImGuiShrinkWidthItem
function ImGuiShrinkWidthItem() return { Index = 0, Width = 0.0, InitialWidth = 0.0 } end

--- @param shared_font_atlas? ImFontAtlas
--- @return ImGuiContext
--- @nodiscard
function ImGuiContext(shared_font_atlas) -- TODO: tidy up / complete this structure
    local this = {
        Style = ImGuiStyle(),
        ColorStack = ImVector(),
        StyleVarStack = ImVector(),

        Config = nil,
        Initialized = false,
        WithinFrameScope = false,
        WithinFrameScopeWithImplicitWindow = false,

        Windows = ImVector(), -- Windows sorted in display order, back to front
        WindowsById = {}, -- Map window's ID to window ref

        WindowsBorderHoverPadding = 0,

        WindowsActiveCount = 0,

        WindowsTempSortBuffer = ImVector(),
        CurrentWindowStack = ImVector(),
        CurrentWindow = nil,

        WindowsFocusOrder = ImVector(),

        IO = ImGuiIO(),
        PlatformIO = ImGuiPlatformIO(),

        ConfigFlagsCurrFrame = ImGuiConfigFlags.None,
        ConfigFlagsLastFrame = ImGuiConfigFlags.None,

        MouseLastValidPos = ImVec2(),

        KeysMayBeCharInput = ImBitArray(ImGuiKey.NamedKey_COUNT, -ImGuiKey.NamedKey_BEGIN),
        KeysOwnerData = {}, -- size = ImGuiKey.NamedKey_COUNT
        KeysRoutingTable = ImGuiKeyRoutingTable(),

        InputEventsQueue = ImVector(),

        InputEventsNextMouseSource = ImGuiMouseSource.Mouse,
        InputEventsNextEventId = 1,

        MovingWindow = nil,

        WheelingWindow = nil,
        WheelingWindowStartFrame = -1, WheelingWindowScrolledFrame = -1,
        WheelingWindowReleaseTimer = 0.0,
        WheelingWindowRefMousePos = ImVec2(),
        WheelingWindowWheelRemainder = ImVec2(),
        WheelingAxisAvg = ImVec2(),

        ActiveIdClickOffset = ImVec2(),

        HoveredWindow = nil,
        HoveredWindowUnderMovingWindow = nil,
        HoveredIdIsDisabled = false,

        ActiveIdFromShortcut = false,

        AnyIdHasBeenEditedThisFrame = false,
        ActiveId = 0,
        ActiveIdWindow = nil,

        ActiveIdMouseButton = -1,

        ActiveIdIsJustActivated = false,

        ActiveIdWasSelected = false, ActiveIdWasSoleSelected = false,
        LastActiveIdWasSelected = false, LastActiveIdWasSoleSelected = false,

        ActiveIdNoClearOnFocusLoss = false,
        ActiveIdHasBeenPressedBefore = false,

        ActiveIdIsAlive = nil,

        ActiveIdPreviousFrame = 0,

        ActiveIdTimer = 0.0,

        LastActiveId = 0,
        LastActiveIdTimer = 0.0,

        ActiveIdUsingNavDirMask = 0x00,
        ActiveIdUsingAllKeyboardKeys = false,

        DeactivatedItemData = {
            ID = 0,
            ElapseFrame = 0,
            HasBeenEditedBefore = false,
            IsAlive = false
        },

        HoveredId = 0,
        HoveredIdTimer = 0.0,
        HoveredIdNotActiveTimer = 0.0,
        HoveredIdAllowOverlap = false,

        HoverItemDelayId = 0, HoverItemDelayIdPreviousFrame = 0, HoverItemUnlockedStationaryId = 0, HoverWindowUnlockedStationaryId = 0,
        HoverItemDelayTimer = 0.0, HoverItemDelayClearTimer = 0.0,

        ActiveIdAllowOverlap = false,

        NavLayer = ImGuiNavLayer.Main,
        NavId = 0,
        NavOpenContextMenuItemId = 0, NavOpenContextMenuWindowId = 0,
        NavWindow = nil,
        NavHighlightActivatedId = 0,
        NavHighlightActivatedTimer = 0.0,
        NavCursorVisible = false,
        NavCursorHideFrames = 0,
        NavHighlightItemUnderNav = false,
        NavIdIsAlive = false,
        NavInputSource = ImGuiInputSource.Keyboard,
        NavWindowingTarget = nil, NavWindowingTargetAnim = nil, NavWindowingListWindow = nil,
        NavWindowingTimer = 0.0, NavWindowingHighlightAlpha = 0.0,
        NavWindowingToggleLayer = false,
        NavWindowingToggleKey = ImGuiKey.None,
        NavWindowingInputSource = ImGuiInputSource.None,
        NavWindowingAccumDeltaPos = ImVec2(0.0, 0.0), NavWindowingAccumDeltaSize = ImVec2(0.0, 0.0),
        DimBgRatio = 0.0,
        LastKeyboardKeyPressTime = -1.0, LastKeyModsChangeTime = -1.0, LastKeyModsChangeFromNoneTime = -1.0,
        ConfigNavWindowingKeyNext = bit32.bor(ImGuiMod_Ctrl, ImGuiKey.Tab),
        ConfigNavWindowingKeyPrev = bit32.bor(ImGuiMod_Ctrl, ImGuiMod_Shift, ImGuiKey.Tab),
        ConfigNavWindowingWithGamepad = true,

        NavFocusRoute = ImVector(),

        NavAnyRequest = false,
        NavInitRequest = false,
        NavInitRequestFromMove = false,
        NavInitResult = ImGuiNavItemData(),
        NavMoveSubmitted = false,
        NavMoveScoringItems = false,
        NavMoveForwardToNextFrame = false,
        NavMoveFlags = ImGuiNavMoveFlags.None,
        NavMoveScrollFlags = ImGuiScrollFlags.None,
        NavMoveKeyMods = ImGuiMod_None,
        NavMoveDir = ImGuiDir.None, NavMoveDirForDebug = ImGuiDir.None, NavMoveClipDir = ImGuiDir.None,
        NavMoveResultLocal = ImGuiNavItemData(),
        NavMoveResultOther = ImGuiNavItemData(),
        NavMoveResultLocalVisible = ImGuiNavItemData(),
        NavTabbingResultFirst = ImGuiNavItemData(),
        NavScoringRect = ImRect(),
        NavScoringNoClipRect = ImRect(),
        ConfigNavEnableTabbing = true,
        NavTabbingCounter = 0,
        NavTabbingDir = 0,
        NavNextActivateId = 0,
        NavNextActivateFlags = ImGuiActivateFlags.None,
        NavActivateId = 0, NavActivateDownId = 0, NavActivatePressedId = 0,
        NavActivateFlags = ImGuiActivateFlags.None,

        FrameCount = -1,

        FrameCountEnded = -1,
        FrameCountPlatformEnded = -1,
        FrameCountRendered = -1,

        Time = 0,

        NextItemData = ImGuiNextItemData(),
        LastItemData = ImGuiLastItemData(),
        NextWindowData = ImGuiNextWindowData(),

        Viewports = ImVector(),

        FallbackMonitor = nil,

        GcCompactAll = false,

        CurrentViewport = nil,
        MouseViewport = nil, MouseLastHoveredViewport = nil,
        PlatformLastFocusedViewportId = 1,
        ViewportCreatedCount = 0, PlatformWindowsCreatedCount = 0,
        ViewportFocusedStampCount = 0,

        Font = nil,
        FontSize = 0.0,
        FontSizeBase = 0.0,
        CurrentDpiScale = 0.0,

        FontRefSize = 0.0,

        FontRasterizerDensity = 1.0,

        FontAtlases = ImVector(),

        FontStack = ImVector(),

        OpenPopupStack = ImVector(),
        BeginPopupStack = ImVector(),

        TreeNodeStack = ImVector(ImGuiTreeNodeStackData),

        WithinEndChildID = 0, WithinEndPopupID = 0,

        BeginMenuDepth = 0, BeginComboDepth = 0,

        ColorEditCurrentID = 0, ColorEditSavedID = 0,
        ColorEditSavedHue = 0.0, ColorEditSavedSat = 0.0,
        ColorEditSavedColor = 0,
        ColorPickerRef = ImVec4(),

        MenusIdSubmittedThisFrame = ImVector(),

        DrawListSharedData = ImDrawListSharedData(),

        StackSizesInBeginForCurrentWindow = nil,

        MouseCursor = ImGuiMouseCursor.Arrow,
        MouseStationaryTimer = 0.0,

        InputTextState = ImGuiInputTextState(),
        InputTextLineIndex = ImGuiTextIndex(),
        InputTextDeactivatedState = ImGuiInputTextDeactivatedState(),
        InputTextPasswordFontBackupBaked = ImFontBaked(),
        InputTextReactivateId = 0,
        TempInputId = 0,

        ActiveIdValueOnActivation = 0,
        DataTypeZeroValue = 0,

        ComboPreviewData = ImGuiComboPreviewData(),

        CurrentTabBar = nil,
        TabBars = ImPool(ImGuiTabBar),   -- ImPool<ImGuiTabBar>
        -- Docking
        DockContext = ImGuiDockContext(),
        DockNodeWindowMenuHandler = nil,
        DebugHoveredDockNode = nil,
        CurrentTabBarStack = ImVector(), -- holds ImGuiTabBar references directly (no ImGuiPtrOrIndex needed in Lua)
        ShrinkWidthBuffer = ImVector(),  -- ImGuiShrinkWidthItem

        WindowResizeBorderExpectedRect = ImRect(),
        WindowResizeRelativeMode = false,

        ScrollbarSeekMode = 0,
        ScrollbarClickDeltaToGrabCenter = 0.0,

        SliderGrabClickOffset = 0.0,
        SliderCurrentAccum = 0.0,
        SliderCurrentAccumDirty = false,
        DragCurrentAccumDirty = false,
        DragCurrentAccum = 0.0,
        DragSpeedDefaultRatio = 1.0 / 100.0,

        TooltipOverrideCount = 0,
        TooltipPreviousWindow = nil,

        FocusScopeStack = ImVector(),
        CurrentFocusScopeId = 0,
        CurrentItemFlags = ImGuiItemFlags.None,

        DisabledAlphaBackup = 0.0,
        DisabledStackSize = 0,

        ItemFlagsStack = ImVector(),
        GroupStack = ImVector(),

        PlatformImeData = ImGuiPlatformImeData(),
        PlatformImeDataPrev = ImGuiPlatformImeData(),

        -- Extensions
        UserTextures = ImVector(),

        -- Settings
        SettingsLoaded = false,
        SettingsDirtyTimer = 0.0,
        SettingsIniData = "",          -- In memory .ini settings (string)
        SettingsHandlers = ImVector(), -- List of .ini settings handlers
        SettingsWindows = ImVector(),
        SettingsTables = ImVector(),

        -- Hooks
        Hooks = ImVector(),
        HookIdNext = 0,

        -- Drag and Drop
        DragDropActive = false,
        DragDropWithinSource = false,
        DragDropWithinTarget = false,
        DragDropSourceFlags = 0,
        DragDropSourceFrameCount = -1,
        DragDropMouseButton = -1,
        DragDropPayload = ImGuiPayload(),
        DragDropTargetRect = ImRect(),
        DragDropTargetClipRect = ImRect(),
        DragDropTargetId = 0,
        DragDropTargetFullViewport = 0,
        DragDropAcceptFlagsCurr = 0, DragDropAcceptFlagsPrev = 0,
        DragDropAcceptIdCurrRectSurface = 0.0,
        DragDropAcceptFrameCount = -1,
        DragDropHoldJustPressedId = 0,

        DragDropAcceptIdPrev = 0, DragDropAcceptIdCurr = 0,

        -- Clipper
        ClipperTempDataStacked = 0,
        ClipperTempData = ImVector(),

        -- Logging
        LogEnabled = false,
        LogLineFirstItem = false,
        LogFlags = 0,
        LogWindow = nil,
        LogFile = nil,
        LogBuffer = ImGuiTextBuffer(),
        LogNextPrefix = nil, LogNextSuffix = nil,
        LogLinePosY = FLT_MAX,
        LogDepthRef = 0,
        LogDepthToExpand = 2, LogDepthToExpandDefault = 2,

        -- Error handling
        ErrorCallback = nil, ErrorCallbackUserData = nil,
        ErrorTooltipLockedPos = ImVec2(),
        ErrorFirst = true,
        ErrorCountCurrentFrame = 0,
        StackSizesInNewFrame = nil,
        ContextName = "",
        DebugBreakInWindow = 0,

        LocalizationTable = {},

        DebugLogFlags = bitOr(ImGuiDebugLogFlags.EventError, ImGuiDebugLogFlags.OutputToTTY),
        DebugFlashStyleColorIdx = nil,

        DebugMetricsConfig = ImGuiMetricsConfig(),
        DebugAllocInfo = ImGuiDebugAllocInfo(),

        --- Misc
        FramerateSecPerFrame = {}, -- size = 60
        FramerateSecPerFrameIdx = 0,
        FramerateSecPerFrameCount = 0,
        FramerateSecPerFrameAccum = 0,

        WantCaptureMouseNextFrame = -1,
        WantCaptureKeyboardNextFrame = -1,
        WantTextInputNextFrame = -1,
        TempBuffer = ImVector(),

        -- Tables (imgui_tables.lua)
        CurrentTable = nil,
        DebugBreakInTable = 0,
        TablesTempDataStacked = 0,
        TablesTempData = ImVector(),
        Tables = ImPool(),                 -- ImPool<ImGuiTable>, 0-based indices (imgui_tables.lua)
        TablesLastTimeActive = ImVector(), -- [table_idx + 1] = float
        DrawChannelsTempMergeBuffer = ImVector(),
        SettingsTables = ImVector(),       -- ImChunkStream<ImGuiTableSettings>: plain vector, SettingsOffset = 1-based index
    }

    for i = 0, 59 do this.FramerateSecPerFrame[i] = 0 end

    this.IO.Fonts = (shared_font_atlas ~= nil) and shared_font_atlas or ImFontAtlas()
    if shared_font_atlas == nil then
        this.IO.Fonts.OwnerContext = this
    end

    for i = 0, ImGuiKey.NamedKey_COUNT - 1 do
        this.KeysOwnerData[i] = ImGuiKeyOwnerData()
    end

    this.IO.Ctx = this
    this.InputTextState.Ctx = this

    ImVec2_Copy(this.PlatformImeDataPrev.InputPos, ImVec2(-1.0, -1.0))

    return this
end

--- @class ImGuiWindowSettings
--- @field ID           int     # Window ID
--- @field Pos          ImVec2  # Window position
--- @field Size         ImVec2  # Window size
--- @field Collapsed    bool    # Whether window is collapsed
--- @field IsChild      bool    # Whether window is a child window
--- @field WantApply    bool    # Set when loaded from .ini data
--- @field WantDelete   bool    # Set to invalidate/delete the settings entry
--- @field Name         string  # Window name
local IMGUI_WINDOW_SETTINGS = {}
IMGUI_WINDOW_SETTINGS.__index = IMGUI_WINDOW_SETTINGS

function IMGUI_WINDOW_SETTINGS:GetName()
    return self.Name
end

function ImGuiWindowSettings()
    return setmetatable({
        ID           = 0,
        Pos          = ImVec2(0, 0),
        Size         = ImVec2(0, 0),
        Collapsed    = false,
        IsChild      = false,
        WantApply    = false,
        WantDelete   = false,
        Name         = "",
        ViewportId   = 0,
        ViewportPos  = ImVec2(0, 0),
        DockId       = 0,
        DockOrder    = -1,
        ClassId      = 0,
        LastUsedDate = 0,
    }, IMGUI_WINDOW_SETTINGS)
end

--- @class ImGuiMenuColumns
--- @field TotalWidth     ImU32
--- @field NextTotalWidth ImU32
--- @field Spacing        ImU16
--- @field OffsetIcon     ImU16   # Always zero for now
--- @field OffsetLabel    ImU16   # Offsets are locked in Update()
--- @field OffsetShortcut ImU16
--- @field OffsetMark     ImU16
--- @field Widths         ImU16[] # Width of: Icon, Label, Shortcut, Mark (accumulators for current frame)
MT.ImGuiMenuColumns = {}
MT.ImGuiMenuColumns.__index = MT.ImGuiMenuColumns

--- @return ImGuiMenuColumns
local function ImGuiMenuColumns()
    return setmetatable({
        TotalWidth     = 0,
        NextTotalWidth = 0,
        Spacing        = 0,
        OffsetIcon     = 0,
        OffsetLabel    = 0,
        OffsetShortcut = 0,
        OffsetMark     = 0,
        Widths         = {0, 0, 0, 0}
    }, MT.ImGuiMenuColumns)
end

--- @class ImGuiWindowTempData
--- @field CursorPos                     ImVec2
--- @field CursorPosPrevLine             ImVec2
--- @field CursorStartPos                ImVec2
--- @field CursorMaxPos                  ImVec2
--- @field IdealMaxPos                   ImVec2
--- @field CurrLineSize                  ImVec2
--- @field PrevLineSize                  ImVec2
--- @field CurrLineTextBaseOffset        float
--- @field PrevLineTextBaseOffset        float
--- @field IsSameLine                    bool
--- @field IsSetPos                      bool
--- @field Indent                        ImVec1
--- @field ColumnsOffset                 ImVec1
--- @field GroupOffset                   ImVec1
--- @field CursorStartPosLossyness       ImVec2
--- @field TextWrapPos                   float
--- @field TextWrapPosStack              ImVector
--- @field MenuBarAppending              bool
--- @field MenuBarOffset                 ImVec2
--- @field MenuColumns                   ImGuiMenuColumns
--- @field TreeDepth                     int
--- @field TreeHasStackDataDepthMask     ImU32
--- @field TreeRecordsClippedNodesY2Mask ImU32
--- @field ChildWindows                  ImVector<ImGuiWindow>
--- @field LayoutType                    ImGuiLayoutType

--- @return ImGuiWindowTempData
--- @nodiscard
local function ImGuiWindowTempData()
    return {
        DockTabItemStatusFlags = 0,
        DockTabItemRect = ImRect(),
        CursorPos         = ImVec2(),
        CursorPosPrevLine = ImVec2(),
        CursorStartPos    = ImVec2(),
        CursorMaxPos      = ImVec2(),
        IdealMaxPos       = ImVec2(),
        CurrLineSize      = ImVec2(),
        PrevLineSize      = ImVec2(),

        CurrLineTextBaseOffset = 0,
        PrevLineTextBaseOffset = 0,

        IsSameLine = false,
        IsSetPos = false,
        NavLayersActiveMask = 0, NavLayersActiveMaskNext = 0,

        Indent                  = ImVec1(),
        ColumnsOffset           = ImVec1(),
        GroupOffset             = ImVec1(),
        CursorStartPosLossyness = ImVec2(),

        ItemWidth = 0,
        ItemWidthDefault = 0,
        TextWrapPos = 0,
        ItemWidthStack = ImVector(),
        TextWrapPosStack = ImVector(),

        MenuBarAppending = false, -- FIXME: Remove this
        MenuBarOffset = ImVec2(),
        MenuColumns = ImGuiMenuColumns(),
        TreeDepth = 0,
        TreeHasStackDataDepthMask = nil,
        TreeRecordsClippedNodesY2Mask = nil,

        ChildWindows = ImVector(),
        CurrentTableIdx = -1,  -- 0-based index into g.Tables, -1 if none
        CurrentColumns = nil,  -- ImGuiOldColumns (legacy Columns API)
        StateStorage = nil,

        LayoutType = nil
    }
end

--- @class ImGuiWindow
--- @field Ctx                                ImGuiContext
--- @field Name                               string
--- @field ID                                 ImGuiID
--- @field Flags                              ImGuiWindowFlags
--- @field FlagsPreviousFrame                 ImGuiWindowFlags
--- @field ChildFlags                         ImGuiChildFlags
--- @field WindowClass                        ImGuiWindowClass
--- @field Viewport                           ImGuiViewportP
--- @field ViewportId                         ImGuiID
--- @field ViewportPos                        ImVec2
--- @field ViewportAllowPlatformMonitorExtend int
--- @field Pos                                ImVec2
--- @field Size                               ImVec2
--- @field SizeFull                           ImVec2
--- @field ContentSize                        ImVec2
--- @field ContentSizeIdeal                   ImVec2
--- @field ContentSizeExplicit                ImVec2
--- @field Scroll                             ImVec2
--- @field IsExplicitChild                    bool
--- @field FocusOrder                         short               # 1-based, order within WindowsFocusOrder, altered when windows are focused. Can be -1 if invalid
--- @field IDStack                            ImVector<ImGuiID>
--- @field DC                                 ImGuiWindowTempData
--- @field OuterRectClipped                   ImRect
--- @field InnerRect                          ImRect
--- @field InnerClipRect                      ImRect
--- @field WorkRect                           ImRect
--- @field ParentWorkRect                     ImRect
--- @field ClipRect                           ImRect
--- @field ContentRegionRect                  ImRect
--- @field DrawList                           ImDrawList          # Points to DrawListInst
--- @field DrawListInst                       ImDrawList
--- @field ParentWindow?                      ImGuiWindow
--- @field RootWindow                         ImGuiWindow
--- @field RootWindowPopupTree                ImGuiWindow
--- @field RootWindowDockTree                 ImGuiWindow
--- @field StateStorage                       {[ImGuiID]: bool}
--- @field MemoryDrawListIdxCapacity          int
--- @field MemoryDrawListVtxCapacity          int
--- @field MemoryCompacted                    bool
MT.ImGuiWindow = {}
MT.ImGuiWindow.__index = MT.ImGuiWindow

--- @return ImRect
--- @nodiscard
function MT.ImGuiWindow:Rect()
    return ImRect(self.Pos.x, self.Pos.y, self.Pos.x + self.Size.x, self.Pos.y + self.Size.y)
end

--- @return ImRect
--- @nodiscard
function MT.ImGuiWindow:TitleBarRect()
    return ImRect(self.Pos, ImVec2(self.Pos.x + self.SizeFull.x, self.Pos.y + self.TitleBarHeight))
end

--- @return ImRect
--- @nodiscard
function MT.ImGuiWindow:MenuBarRect()
    local y1 = self.Pos.y + self.TitleBarHeight
    return ImRect(self.Pos.x, y1, self.Pos.x + self.SizeFull.x, y1 + self.MenuBarHeight)
end

--- @return ImGuiWindow
--- @nodiscard
function ImGuiWindow(ctx, name)
    local this = {
        ID = 0,

        MoveId = 0,

        Ctx = ctx,
        Name = name,

        Flags = 0,

        ChildFlags = 0,
        WindowClass = ImGuiWindowClass(),

        Pos = ImVec2(),
        Size = ImVec2(), -- Current size (==SizeFull or collapsed title bar size)
        SizeFull = ImVec2(),

        Active = false,
        WasActive = false,

        Collapsed = false,

        SkipItems = false,

        SkipRefresh = false,

        Appearing = false,

        Hidden = false,
        IsFallbackWindow = false,

        IsExplicitChild = nil,

        ResizeBorderHovered = -1,
        ResizeBorderHeld = -1,

        BeginCount = 0,
        BeginCountPreviousFrame = 0,
        BeginOrderWithinParent = 0,
        BeginOrderWithinContext = 0,

        FocusOrder = nil,

        HiddenFramesCanSkipItems = 0,
        HiddenFramesCannotSkipItems = 0,
        HiddenFramesForRenderOnly = 0,

        DisableInputsFrames = 0,

        WindowRounding = 0,
        WindowBorderSize = 1,

        TitleBarHeight = 0, MenuBarHeight = 0,

        DecoOuterSizeX1 = 0, DecoOuterSizeY1 = 0,
        DecoOuterSizeX2 = 0, DecoOuterSizeY2 = 0,
        DecoInnerSizeX1 = 0, DecoInnerSizeY1 = 0,

        ContentSize = ImVec2(),
        ContentSizeIdeal = ImVec2(),
        ContentSizeExplicit = ImVec2(),

        AutoFitFramesX = -1, AutoFitFramesY = -1,
        AutoFitOnlyGrows = false,

        HasCloseButton = true,

        BgClickFlags = 0,

        SetWindowPosAllowFlags = 0, SetWindowSizeAllowFlags = 0, SetWindowCollapsedAllowFlags = 0,
        SetWindowPosVal = ImVec2(FLT_MAX, FLT_MAX),
        SetWindowPosPivot = ImVec2(FLT_MAX, FLT_MAX),

        SettingsOffset = -1,

        ScrollbarSizes = ImVec2(),
        Scroll = ImVec2(),

        ScrollbarX = false,
        ScrollbarY = false,
        ScrollMax = ImVec2(),
        ScrollTarget = ImVec2(FLT_MAX, FLT_MAX),
        ScrollTargetCenterRatio = ImVec2(0.5, 0.5),
        ScrollTargetEdgeSnapDist = ImVec2(),

        ScrollbarXStabilizeToggledHistory = 0,

        DrawList = nil,
        DrawListInst = ImDrawList(ctx.DrawListSharedData),

        RootWindow = nil,
        RootWindowPopupTree = nil,
        RootWindowDockTree = nil,

        ParentWindow = nil,
        ParentWindowInBeginStack = nil,

        IDStack = ImVector(),

        ViewportAllowPlatformMonitorExtend = -1,
        Viewport = nil,
        ViewportId = 0,
        ViewportPos = ImVec2(FLT_MAX, FLT_MAX),
        ViewportOwned = nil,

        DC = ImGuiWindowTempData(),

        OuterRectClipped  = ImRect(),
        InnerRect         = ImRect(),
        InnerClipRect     = ImRect(),
        WorkRect          = ImRect(),
        ParentWorkRect    = ImRect(),
        ContentRegionRect = ImRect(),

        ClipRect = ImRect(),

        LastFrameActive = -1,
        LastFrameJustFocused = -1,
        LastTimeActive = -1.0,

        StateStorage = {},
        ColumnsStorage = ImVector(), -- ImVector<ImGuiOldColumns>

        WriteAccessed = false,

        FontWindowScale = 1.0,
        FontWindowScaleParents = 1.0,

        HitTestHoleSize = ImVec2(),

        NavLastChildNavWindow = nil,
        NavLastIds = {[0] = 0, [1] = 0}, -- FIXME: 1-based instead
        NavRectRel = {[0] = ImRect(), [1] = ImRect()},
        NavPreferredScoringPosRel = {[0] = ImVec2(), [1] = ImVec2()},
        NavRootFocusScopeId = 0
    }

    this.DrawList = this.DrawListInst
    this.DrawList._OwnerName = name

    setmetatable(this, MT.ImGuiWindow)

    this.ID = ImHashStr(name)
    this.IDStack:push_back(this.ID)
    this.MoveId = this:GetID("#MOVE")
    this.TabId = this:GetID("#TAB")
    -- Docking
    this.ChildId = this.ChildId or 0
    this.SetWindowDockAllowFlags = 0
    this.ParentWindowForFocusRoute = nil
    this.DockIsActive = false
    this.DockNodeIsVisible = false
    this.DockTabIsVisible = false
    this.DockTabWantClose = false
    this.DockOrder = -1
    this.DockStyle = { Colors = {} }
    for i = 0, 8 do this.DockStyle.Colors[i] = 0 end
    this.DockNode = nil
    this.DockNodeAsHost = nil
    this.DockId = 0

    return this
end

--- @class ImDrawDataBuilder
--- @field Layers     [ImVector<ImDrawList>?, ImVector<ImDrawList>?]
--- @field LayerData1 ImVector<ImDrawList>

--- @return ImDrawDataBuilder
--- @nodiscard
local function ImDrawDataBuilder()
    return
    {
        Layers     = {nil, nil},
        LayerData1 = ImVector()
    }
end

--- @class ImGuiViewportP : ImGuiViewport
--- @field Window?                     ImGuiWindow
--- @field Idx                         int                      # Initial value = -1, then becomes 1-based index
--- @field LastFrameActive             int
--- @field LastFocusedStampCount       int
--- @field LastNameHash                ImGuiID
--- @field LastPos                     ImVec2
--- @field LastSize                    ImVec2
--- @field Alpha                       float
--- @field LastAlpha                   float
--- @field LastFocusedHadNavWindow     bool
--- @field PlatformMonitor             short
--- @field BgFgDrawListsLastTimeActive [int, int]               # 1-based
--- @field BgFgDrawLists               [ImDrawList, ImDrawList] # 1-based
--- @field DrawDataP                   ImDrawData
--- @field DrawDataBuilder             ImDrawDataBuilder
--- @field LastPlatformPos             ImVec2
--- @field LastPlatformSize            ImVec2
--- @field LastRendererSize            ImVec2
--- @field WorkInsetMin                ImVec2
--- @field WorkInsetMax                ImVec2
--- @field BuildWorkInsetMin           ImVec2
--- @field BuildWorkInsetMax           ImVec2
local IMGUI_VIEWPORT_P = {}
IMGUI_VIEWPORT_P.__index = IMGUI_VIEWPORT_P

setmetatable(IMGUI_VIEWPORT_P, {__index = MT.ImGuiViewport})

function IMGUI_VIEWPORT_P:ClearRequestFlags()
    self.PlatformRequestClose  = false
    self.PlatformRequestMove   = false
    self.PlatformRequestResize = false
end

function IMGUI_VIEWPORT_P:CalcWorkRectPos(inset_min)
    return ImVec2(self.Pos.x + inset_min.x, self.Pos.y + inset_min.y)
end

function IMGUI_VIEWPORT_P:CalcWorkRectSize(inset_min, inset_max)
    return ImVec2(ImMax(0.0, self.Size.x - inset_min.x - inset_max.x), ImMax(0.0, self.Size.y - inset_min.y - inset_max.y))
end

function IMGUI_VIEWPORT_P:UpdateWorkRect()
    self.WorkPos = self:CalcWorkRectPos(self.WorkInsetMin)
    self.WorkSize = self:CalcWorkRectSize(self.WorkInsetMin, self.WorkInsetMax)
end

--- @nodiscard
function IMGUI_VIEWPORT_P:GetMainRect()
    return ImRect(self.Pos.x, self.Pos.y,
        self.Pos.x + self.Size.x,
        self.Pos.y + self.Size.y)
end

--- @nodiscard
function IMGUI_VIEWPORT_P:GetWorkRect()
    return ImRect(self.WorkPos.x, self.WorkPos.y,
        self.WorkPos.x + self.WorkSize.x,
        self.WorkPos.y + self.WorkSize.y)
end

--- @nodiscard
function IMGUI_VIEWPORT_P:GetBuildWorkRect()
    local pos = self:CalcWorkRectPos(self.BuildWorkInsetMin)
    local size = self:CalcWorkRectSize(self.BuildWorkInsetMin, self.BuildWorkInsetMax)
    return ImRect(pos.x, pos.y, pos.x + size.x, pos.y + size.y)
end

--- @return ImGuiViewportP
--- @nodiscard
function ImGuiViewportP()
    local this = setmetatable(ImGuiViewport(), IMGUI_VIEWPORT_P) --- @cast this ImGuiViewportP

    this.Window = nil
    this.Idx = -1

    this.LastFrameActive       = -1
    this.LastFocusedStampCount = -1
    this.LastNameHash          = 0
    this.LastPos               = ImVec2() -- ImGuiViewport() { memset(this, 0, sizeof(*this)); }
    this.LastSize              = ImVec2()

    this.Alpha     = 1.0
    this.LastAlpha = 1.0

    this.LastFocusedHadNavWindow = false
    this.PlatformMonitor = -1

    this.BgFgDrawListsLastTimeActive = {-1, -1}
    this.BgFgDrawLists = {nil, nil}
    this.DrawDataP = ImDrawData()
    this.DrawDataBuilder = ImDrawDataBuilder()

    this.LastPlatformPos  = ImVec2(FLT_MAX, FLT_MAX)
    this.LastPlatformSize = ImVec2(FLT_MAX, FLT_MAX)
    this.LastRendererSize = ImVec2(FLT_MAX, FLT_MAX)

    this.WorkInsetMin = ImVec2(0, 0)
    this.WorkInsetMax = ImVec2(0, 0)
    this.BuildWorkInsetMin = ImVec2(0, 0)
    this.BuildWorkInsetMax = ImVec2(0, 0)

    return this
end

--- @class ImFontLoader
--- @field Name                       string
--- @field LoaderInit?                fun(atlas: ImFontAtlas): bool
--- @field LoaderShutdown?            fun(atlas: ImFontAtlas)
--- @field FontSrcInit?               fun(atlas: ImFontAtlas, src: ImFontConfig): bool
--- @field FontSrcDestroy?            fun(atlas: ImFontAtlas, src: ImFontConfig)
--- @field FontSrcContainsGlyph?      fun(atlas: ImFontAtlas, src: ImFontConfig, codepoint: ImWchar): bool
--- @field FontBakedInit?             fun(atlas: ImFontAtlas, src: ImFontConfig, baked: ImFontBaked, loader_data_for_baked_src?: any): bool
--- @field FontBakedDestroy?          fun(atlas: ImFontAtlas, src: ImFontConfig, baked: ImFontBaked, loader_data_for_baked_src?: any)
--- @field FontBakedLoadGlyph         fun(atlas: ImFontAtlas, src: ImFontConfig, baked: ImFontBaked, loader_data_for_baked_src?: any, codepoint: ImWchar, out_glyph?: ImFontGlyph, advance_x?: float): bool, float?
--- @field FontBakedSrcLoaderDataSize unsigned_int
MT.ImFontLoader = {}
MT.ImFontLoader.__index = MT.ImFontLoader

--- @return ImFontLoader
--- @nodiscard
function ImFontLoader()
    --- @type ImFontLoader
    local this = setmetatable({}, MT.ImFontLoader)

    this.Name                 = nil
    this.LoaderInit           = nil
    this.LoaderShutdown       = nil
    this.FontSrcInit          = nil
    this.FontSrcDestroy       = nil
    this.FontSrcContainsGlyph = nil
    this.FontBakedInit        = nil
    this.FontBakedDestroy     = nil
    this.FontBakedLoadGlyph   = nil

    this.FontBakedSrcLoaderDataSize = 0

    return this
end

--- @class ImFontAtlasRectEntry
--- @field TargetIndex int          # 0-based! When IsUsed = true, TargetIndex = this rect's index in Rects; IsUsed = false, TargetIndex = the next unused RectsIndex entry's index
--- @field Generation  unsigned_int # How many times this entry is reused
--- @field IsUsed      bool

--- @return ImFontAtlasRectEntry
--- @nodiscard
function ImFontAtlasRectEntry()
    return {
        TargetIndex = 0,
        Generation  = 0,
        IsUsed      = false
    }
end

local ImFontAtlasRectId_IndexMask_       = 0x0007FFFF
local ImFontAtlasRectId_GenerationMask_  = 0x3FF00000
local ImFontAtlasRectId_GenerationShift_ = 20

--- @param id ImFontAtlasRectId # Expects 0-based!
--- @return int                 # 0-based!
function ImFontAtlasRectId_GetIndex(id) return bitAnd(id, ImFontAtlasRectId_IndexMask_) end

--- @param id ImFontAtlasRectId # Expects 0-based!
--- @return unsigned_int
function ImFontAtlasRectId_GetGeneration(id) return bitRShift(bitAnd(id, ImFontAtlasRectId_GenerationMask_), ImFontAtlasRectId_GenerationShift_) end

--- @param index_idx int      # Expects 0-based!
--- @param gen_idx int
--- @return ImFontAtlasRectId # 0-based!
function ImFontAtlasRectId_Make(index_idx, gen_idx)
    IM_ASSERT(index_idx >= 0 and index_idx <= ImFontAtlasRectId_IndexMask_ and gen_idx <= bitRShift(ImFontAtlasRectId_GenerationMask_, ImFontAtlasRectId_GenerationShift_))
    return bitOr(index_idx, bitLShift(gen_idx, ImFontAtlasRectId_GenerationShift_))
end

--- @class ImFontAtlasPostProcessData
--- @field FontAtlas   ImFontAtlas
--- @field Font        ImFont
--- @field FontSrc     ImFontConfig
--- @field FontBaked   ImFontBaked
--- @field Glyph       ImFontGlyph
--- @field Pixels      unsigned_char[]
--- @field _PixelsBase int             # LUA: in cpp code the `Pixels` is a pointer. we can do this to avoid creating another custom structure to mimic it
--- @field Format      ImTextureFormat
--- @field Pitch       int
--- @field Width       int
--- @field Height      int

--- @param atlas       ImFontAtlas
--- @param font        ImFont
--- @param font_src    ImFontConfig
--- @param font_baked  ImFontBaked
--- @param glyph       ImFontGlyph
--- @param pixels      unsigned_char[]
--- @param pixels_base int
--- @param format      ImTextureFormat
--- @param pitch       int
--- @param width       int
--- @param height      int
--- @return ImFontAtlasPostProcessData
--- @nodiscard
function ImFontAtlasPostProcessData(atlas, font, font_src, font_baked, glyph, pixels, pixels_base, format, pitch, width, height)
    return {
        FontAtlas = atlas,
        Font      = font,
        FontSrc   = font_src,
        FontBaked = font_baked,
        Glyph     = glyph,

        Pixels = pixels,
        _PixelsBase = pixels_base,
        Format = format,
        Pitch  = pitch,
        Width  = width,
        Height = height,
    }
end

--- @enum ImGuiInputSource
ImGuiInputSource = {
    None     = 0,
    Mouse    = 1,
    Keyboard = 2,
    Gamepad  = 3,
    COUNT    = 4
}

--- @class ImGuiInputEventMousePos
--- @field PosX float
--- @field PosY float
--- @field MouseSource ImGuiMouseSource

--- @return ImGuiInputEventMousePos
--- @nodiscard
function ImGuiInputEventMousePos()
    return { PosX = 0, PosY = 0, MouseSource = ImGuiMouseSource.Mouse }
end

--- @class ImGuiInputEventMouseButton
--- @field Button int
--- @field Down   bool
--- @field MouseSource ImGuiMouseSource

--- @return ImGuiInputEventMouseButton
--- @nodiscard
function ImGuiInputEventMouseButton()
    return { Button = 0, Down = false, MouseSource = ImGuiMouseSource.Mouse }
end

--- @class ImGuiInputEventMouseWheel
--- @field WheelX float
--- @field WheelY float
--- @field MouseSource ImGuiMouseSource

--- @return ImGuiInputEventMouseWheel
--- @nodiscard
function ImGuiInputEventMouseWheel()
    return { WheelX = 0, WheelY = 0, MouseSource = ImGuiMouseSource.Mouse }
end

--- @class ImGuiInputEventKey
--- @field Key         ImGuiKey
--- @field Down        bool
--- @field AnalogValue float

--- @return ImGuiInputEventKey
--- @nodiscard
function ImGuiInputEventKey()
    return { Key = 0, Down = false, AnalogValue = 0 }
end

--- @class ImGuiInputEventText
--- @field Char unsigned_int

--- @return ImGuiInputEventText
--- @nodiscard
function ImGuiInputEventText()
    return { Char = nil }
end

--- @class ImGuiInputEventAppFocused
--- @field Focused bool

--- @return ImGuiInputEventAppFocused
--- @nodiscard
function ImGuiInputEventAppFocused()
    return { Focused = nil }
end

--- @class ImGuiInputEventMouseViewport
--- @field HoveredViewportID ImGuiID

--- @return ImGuiInputEventMouseViewport
--- @nodiscard
function ImGuiInputEventMouseViewport()
    return { HoveredViewportID = 0 }
end

--- @class ImGuiInputEvent

--- @return ImGuiInputEvent
--- @nodiscard
function ImGuiInputEvent()
    return {
        Type    = 0,
        Source  = 0,
        EventId = 0,

        -- union
        MousePos      = nil, -- if Type == ImGuiInputEventType.MousePos
        MouseWheel    = nil, -- if Type == ImGuiInputEventType.MouseWheel
        MouseButton   = nil, -- if Type == ImGuiInputEventType.MouseButton
        MouseViewport = nil, -- if Type == ImGuiInputEventType.MouseViewport
        Key           = nil, -- if Type == ImGuiInputEventType.Key
        Text          = nil, -- if Type == ImGuiInputEventType.Text
        AppFocused    = nil, -- if Type == ImGuiInputEventType.Focus
    }
end

ImGuiKey_Keyboard_BEGIN = ImGuiKey.NamedKey_BEGIN
ImGuiKey_Keyboard_END   = ImGuiKey.GamepadStart
ImGuiKey_Gamepad_BEGIN  = ImGuiKey.GamepadStart
ImGuiKey_Gamepad_END    = ImGuiKey.GamepadRStickDown + 1
ImGuiKey_Mouse_BEGIN    = ImGuiKey.MouseLeft
ImGuiKey_Mouse_END      = ImGuiKey.MouseWheelY + 1
ImGuiKey_Aliases_BEGIN  = ImGuiKey_Mouse_BEGIN
ImGuiKey_Aliases_END    = ImGuiKey_Mouse_END

ImGuiKey.NavKeyboardTweakSlow = ImGuiMod_Ctrl
ImGuiKey.NavKeyboardTweakFast = ImGuiMod_Shift
ImGuiKey.NavGamepadTweakSlow = ImGuiKey.GamepadL1
ImGuiKey.NavGamepadTweakFast = ImGuiKey.GamepadR1
ImGuiKey.NavGamepadMenu = ImGuiKey.GamepadFaceLeft
ImGuiKey.NavGamepadContextMenu = ImGuiKey.GamepadFaceUp

--- @enum ImGuiInputEventType
ImGuiInputEventType = {
    None          = 0,
    MousePos      = 1,
    MouseWheel    = 2,
    MouseButton   = 3,
    MouseViewport = 4,
    Key           = 5,
    Text          = 6,
    Focus         = 7,
    COUNT         = 8
}

ImGuiInputFlags.RepeatRateDefault                = bitLShift(1, 1)
ImGuiInputFlags.RepeatRateNavMove                = bitLShift(1, 2)
ImGuiInputFlags.RepeatRateNavTweak               = bitLShift(1, 3)
ImGuiInputFlags.RepeatUntilRelease               = bitLShift(1, 4)
ImGuiInputFlags.RepeatUntilKeyModsChange         = bitLShift(1, 5)
ImGuiInputFlags.RepeatUntilKeyModsChangeFromNone = bitLShift(1, 6)
ImGuiInputFlags.RepeatUntilOtherKeyPress         = bitLShift(1, 7)
ImGuiInputFlags.LockThisFrame                    = bitLShift(1, 20)
ImGuiInputFlags.LockUntilRelease                 = bitLShift(1, 21)
ImGuiInputFlags.CondHovered                      = bitLShift(1, 22)
ImGuiInputFlags.CondActive                       = bitLShift(1, 23)

ImGuiInputFlags.CondDefault_                   = bitOr(ImGuiInputFlags.CondHovered, ImGuiInputFlags.CondActive)
ImGuiInputFlags.RepeatRateMask_                = bitOr(ImGuiInputFlags.RepeatRateDefault, ImGuiInputFlags.RepeatRateNavMove, ImGuiInputFlags.RepeatRateNavTweak)
ImGuiInputFlags.RepeatUntilMask_               = bitOr(ImGuiInputFlags.RepeatUntilRelease, ImGuiInputFlags.RepeatUntilKeyModsChange, ImGuiInputFlags.RepeatUntilKeyModsChangeFromNone, ImGuiInputFlags.RepeatUntilOtherKeyPress)
ImGuiInputFlags.RepeatMask_                    = bitOr(ImGuiInputFlags.Repeat, ImGuiInputFlags.RepeatRateMask_, ImGuiInputFlags.RepeatUntilMask_)
ImGuiInputFlags.CondMask_                      = bitOr(ImGuiInputFlags.CondHovered, ImGuiInputFlags.CondActive)
ImGuiInputFlags.RouteTypeMask_                 = bitOr(ImGuiInputFlags.RouteActive, ImGuiInputFlags.RouteFocused, ImGuiInputFlags.RouteGlobal, ImGuiInputFlags.RouteAlways)
ImGuiInputFlags.RouteOptionsMask_              = bitOr(ImGuiInputFlags.RouteOverFocused, ImGuiInputFlags.RouteOverActive, ImGuiInputFlags.RouteUnlessBgFocused, ImGuiInputFlags.RouteFromRootWindow)
ImGuiInputFlags.SupportedByIsKeyPressed        = ImGuiInputFlags.RepeatMask_
ImGuiInputFlags.SupportedByIsMouseClicked      = ImGuiInputFlags.Repeat
ImGuiInputFlags.SupportedByShortcut            = bitOr(ImGuiInputFlags.RepeatMask_, ImGuiInputFlags.RouteTypeMask_, ImGuiInputFlags.RouteOptionsMask_)
ImGuiInputFlags.SupportedBySetNextItemShortcut = bitOr(ImGuiInputFlags.RepeatMask_, ImGuiInputFlags.RouteTypeMask_, ImGuiInputFlags.RouteOptionsMask_, ImGuiInputFlags.Tooltip)
ImGuiInputFlags.SupportedBySetKeyOwner         = bitOr(ImGuiInputFlags.LockThisFrame, ImGuiInputFlags.LockUntilRelease)
ImGuiInputFlags.SupportedBySetItemKeyOwner     = bitOr(ImGuiInputFlags.SupportedBySetKeyOwner, ImGuiInputFlags.CondMask_)

--- @enum ImGuiAxis # can be used to index ImVec2
ImGuiAxis =
{
    None = 0,
    X    = 1,
    Y    = 2
}

--- @enum ImGuiPlotType
ImGuiPlotType =
{
    Lines     = 0,
    Histogram = 1
}

--- @enum ImGuiActivateFlags
ImGuiActivateFlags = {
    None               = 0,
    PreferInput        = bitLShift(1, 0),
    PreferTweak        = bitLShift(1, 1),
    TryToPreserveState = bitLShift(1, 2),
    FromTabbing        = bitLShift(1, 3),
    FromShortcut       = bitLShift(1, 4),
    FromFocusApi       = bitLShift(1, 5)
}

--- @enum ImGuiScrollFlags
ImGuiScrollFlags = {
    None               = 0,
    KeepVisibleEdgeX   = bitLShift(1, 0),
    KeepVisibleEdgeY   = bitLShift(1, 1),
    KeepVisibleCenterX = bitLShift(1, 2),
    KeepVisibleCenterY = bitLShift(1, 3),
    AlwaysCenterX      = bitLShift(1, 4),
    AlwaysCenterY      = bitLShift(1, 5),
    NoScrollParent     = bitLShift(1, 6),
}

ImGuiScrollFlags.MaskX_ = bitOr(ImGuiScrollFlags.KeepVisibleEdgeX, ImGuiScrollFlags.KeepVisibleCenterX, ImGuiScrollFlags.AlwaysCenterX)
ImGuiScrollFlags.MaskY_ = bitOr(ImGuiScrollFlags.KeepVisibleEdgeY, ImGuiScrollFlags.KeepVisibleCenterY, ImGuiScrollFlags.AlwaysCenterY)

--- @class ImGuiGroupData
--- @field WindowID                          ImGuiID
--- @field BackupCursorPos                   ImVec2
--- @field BackupCursorMaxPos                ImVec2
--- @field BackupCursorPosPrevLine           ImVec2
--- @field BackupIndent                      ImVec1
--- @field BackupGroupOffset                 ImVec1
--- @field BackupCurrLineSize                ImVec2
--- @field BackupCurrLineTextBaseOffset      float
--- @field BackupActiveIdIsAlive             ImGuiID
--- @field BackupAnyIdHasBeenEditedThisFrame bool
--- @field BackupDeactivatedIdIsAlive        bool
--- @field BackupHoveredIdIsAlive            bool
--- @field BackupIsSameLine                  bool
--- @field EmitItem                          bool

--- @return ImGuiGroupData
--- @nodiscard
function ImGuiGroupData()
    return
    {
        WindowID                          = nil,
        BackupCursorPos                   = ImVec2(),
        BackupCursorMaxPos                = ImVec2(),
        BackupCursorPosPrevLine           = ImVec2(),
        BackupIndent                      = ImVec1(),
        BackupGroupOffset                 = ImVec1(),
        BackupCurrLineSize                = ImVec2(),
        BackupCurrLineTextBaseOffset      = nil,
        BackupActiveIdIsAlive             = nil,
        BackupAnyIdHasBeenEditedThisFrame = nil,
        BackupDeactivatedIdIsAlive        = nil,
        BackupHoveredIdIsAlive            = nil,
        BackupIsSameLine                  = nil,
        EmitItem                          = nil
    }
end

--- @enum ImGuiTooltipFlags
ImGuiTooltipFlags =
{
    None             = 0,
    OverridePrevious = bitLShift(1, 1)
}

--- @enum ImGuiPopupPositionPolicy
ImGuiPopupPositionPolicy =
{
    Default  = 0,
    ComboBox = 1,
    Tooltip  = 2
}

--- @class ImGuiPopupData
--- @field PopupId          ImGuiID
--- @field Window           ImGuiWindow
--- @field RestoreNavWindow ImGuiWindow
--- @field ParentNavLayer   int
--- @field OpenFrameCount   int
--- @field OpenParentId     ImGuiID
--- @field OpenPopupPos     ImVec2
--- @field OpenMousePos     ImVec2

--- @return ImGuiPopupData
--- @nodiscard
function ImGuiPopupData()
    return {
        PopupId          = 0,
        Window           = nil,
        RestoreNavWindow = nil,
        ParentNavLayer   = -1,
        OpenFrameCount   = -1,
        OpenParentId     = 0,
        OpenPopupPos     = ImVec2(),
        OpenMousePos     = ImVec2()
    }
end

--- @enum ImGuiWindowRefreshFlags
ImGuiWindowRefreshFlags = {
    None              = 0,
    TryToAvoidRefresh = bitLShift(1, 0),
    RefreshOnHover    = bitLShift(1, 1),
    RefreshOnFocus    = bitLShift(1, 2)
}

--- @enum ImGuiNavRenderCursorFlags
ImGuiNavRenderCursorFlags = {
    None       = 0,
    Compact    = bitLShift(1, 1), -- Compact highlight, no padding/distance from focused item
    AlwaysDraw = bitLShift(1, 2), -- Draw rectangular highlight if (g.NavId == id) even when g.NavCursorVisible == false, aka even when using the mouse
}

--- @enum ImGuiDebugLogFlags
ImGuiDebugLogFlags = {
    -- Event types
    None              = 0,
    EventError        = bitLShift(1, 0), -- Error submitted by IM_ASSERT_USER_ERROR()
    EventActiveId     = bitLShift(1, 1),
    EventFocus        = bitLShift(1, 2),
    EventPopup        = bitLShift(1, 3),
    EventNav          = bitLShift(1, 4),
    EventClipper      = bitLShift(1, 5),
    EventSelection    = bitLShift(1, 6),
    EventIO           = bitLShift(1, 7),
    EventFont         = bitLShift(1, 8),
    EventInputRouting = bitLShift(1, 9),
    EventDocking      = bitLShift(1, 10),
    EventViewport     = bitLShift(1, 11),
    EventTable        = bitLShift(1, 12),

    OutputToTTY        = bitLShift(1, 20),
    OutputToDebugger   = bitLShift(1, 21),
    OutputToTestEngine = bitLShift(1, 22),
}

ImGuiDebugLogFlags.EventMask_ = bitOr(
    ImGuiDebugLogFlags.EventError,
    ImGuiDebugLogFlags.EventActiveId,
    ImGuiDebugLogFlags.EventFocus,
    ImGuiDebugLogFlags.EventPopup,
    ImGuiDebugLogFlags.EventNav,
    ImGuiDebugLogFlags.EventClipper,
    ImGuiDebugLogFlags.EventSelection,
    ImGuiDebugLogFlags.EventTable,
    ImGuiDebugLogFlags.EventIO,
    ImGuiDebugLogFlags.EventFont,
    ImGuiDebugLogFlags.EventInputRouting,
    ImGuiDebugLogFlags.EventDocking,
    ImGuiDebugLogFlags.EventViewport
)

--- @enum ImGuiLocKey
ImGuiLocKey = {
    VersionStr                    = 1,
    TableSizeOne                  = 2,
    TableSizeAllFit               = 3,
    TableSizeAllDefault           = 4,
    TableReset                    = 5,
    TableResetOrder               = 6,
    TableResetVisibility          = 7,
    WindowingMainMenuBar          = 8,
    WindowingPopup                = 9,
    WindowingUntitled             = 10,
    OpenLink_s                    = 11,
    CopyLink                      = 12,
    DockingHideTabBar             = 13,
    DockingHoldShiftToDock        = 14,
    DockingDragToUndockOrMoveNode = 15,
    COUNT                         = 15
}

--- @class ImGuiLocEntry
--- @field Key  ImGuiLocKey
--- @field Text string

--- @param key ImGuiLocKey
--- @return string
function ImGui.LocalizeGetMsg(key)
    local g = GImGui
    local msg = g.LocalizationTable[key]
    if msg then return msg else return "*Missing Text*" end
end

--- @param id ImGuiID
function ImGui.TempInputIsActive(id)
    local g = GImGui
    return (g.TempInputId == id and g.ActiveId == id) or (g.InputTextDeactivatedState.ID == id)
end

--- @param id ImGuiID
--- @return ImGuiInputTextState?
function ImGui.GetInputTextState(id)
    local g = GImGui
    if id ~= 0 and g.InputTextState.ID == id then
        return g.InputTextState
    end
    return nil
end

-- Storage for PushFocusScope(), g.FocusScopeStack[], g.NavFocusRoute[]
--- @class ImGuiFocusScopeData
--- @field ID       ImGuiID
--- @field WindowID ImGuiID

--- @return ImGuiFocusScopeData
--- @nodiscard
function ImGuiFocusScopeData() return { ID = nil, WindowID = nil } end


return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imgui_tables.lua'] = function()
--- ImGui Sincerely WIP
-- (Tables and Columns Code)
-- 1:1 port of imgui_tables.cpp (docking branch, 1.93 WIP)
--
-- Port notes:
-- - Column indices / display orders / draw channel indices are 0-based VALUES like upstream.
--   Per-column arrays (table.Columns, table.DisplayOrderToIndex, table.RowCellData) are Lua tables with 0-based keys.
--   table.ColumnsSize mirrors upstream `table->Columns.size()`.
-- - ImBitArray masks are Lua tables { [n] = true }.
-- - table.ColumnsNames is a Lua array of strings, column.NameOffset is a 0-based index into it (-1 = none).
-- - g.SettingsTables is a plain vector of ImGuiTableSettings; table.SettingsOffset is a 1-based index into it (-1 = none).
--   Each settings entry owns `Columns` (0-based Lua table of ImGuiTableColumnSettings).
-- - ImGuiTableSortSpecs.Specs is a 1-based Lua array of ImGuiTableColumnSortSpecs.

--- @type ImGuiContext?
local GImGui

local MT = ImGui.GetMetatables()

-- Sets local `GImGui` in this file(imgui_tables.lua).
-- This is currently only used in main code `ImGui.SetCurrentContext()`
--- @param ctx ImGuiContext?
function ImGui._SetCurrentContext_Tables(ctx)
    GImGui = ctx
end

local bit32 = bit32
local band, bor, bnot, lshift, rshift = bit32.band, bit32.bor, bit32.bnot, bit32.lshift, bit32.rshift

IM_COL32_DISABLE = IM_COL32(0, 0, 0, 1)
IMGUI_TABLE_MAX_COLUMNS = 512

local function IMGUI_DEBUG_LOG_TABLE(fmt, ...)
    local g = GImGui
    if band(g.DebugLogFlags, ImGuiDebugLogFlags.EventTable) ~= 0 then ImGui.DebugLog(fmt, ...) end
end

----------------------------------------------------------------
-- [SECTION] Structs
----------------------------------------------------------------

local function BitArrayClearAll(arr) table.clear(arr) end
local function BitArraySet(arr, n) arr[n] = true end
local function BitTest(arr, n) return arr[n] == true end

--- @class ImGuiTableColumnSortSpecs
function ImGuiTableColumnSortSpecs()
    return { ColumnUserID = 0, ColumnIndex = 0, SortOrder = 0, SortDirection = ImGuiSortDirection.None }
end

--- @class ImGuiTableSortSpecs
function ImGuiTableSortSpecs()
    return { Specs = nil, SpecsCount = 0, SpecsDirty = false }
end

--- @class ImGuiTableColumn
function ImGuiTableColumn()
    return {
        Flags = 0, WidthGiven = 0.0, MinX = 0.0, MaxX = 0.0, WidthRequest = -1.0, WidthAuto = 0.0, WidthMax = 0.0,
        StretchWeight = -1.0, InitStretchWeightOrWidth = 0.0, ClipRect = ImRect(), ID = 0, UserData = 0,
        WorkMinX = 0.0, WorkMaxX = 0.0, ItemWidth = 0.0, ContentMaxXFrozen = 0.0, ContentMaxXUnfrozen = 0.0,
        ContentMaxXHeadersUsed = 0.0, ContentMaxXHeadersIdeal = 0.0, NameOffset = -1, DisplayOrder = -1,
        IndexWithinEnabledSet = -1, PrevEnabledColumn = -1, NextEnabledColumn = -1, SortOrder = -1,
        DrawChannelCurrent = -1, DrawChannelFrozen = -1, DrawChannelUnfrozen = -1,
        IsEnabled = false, IsUserEnabled = false, IsUserEnabledNextFrame = false, IsVisibleX = false, IsVisibleY = false,
        IsRequestOutput = false, IsSkipItems = false, IsPreserveWidthAuto = false, IsJustCreated = true,
        IsLoadedSettings = false, IsNeedReconcileSrc = false, IsNeedReconcileDst = false,
        NavLayerCurrent = 0, AutoFitQueue = 0, CannotSkipItemsQueue = 0, SortDirection = ImGuiSortDirection.None,
        SortDirectionsAvailCount = 0, SortDirectionsAvailMask = 0, SortDirectionsAvailList = 0,
    }
end

--- `*dst = *src`
local function TableColumnCopy(dst, src)
    for k, v in pairs(src) do
        if k ~= "ClipRect" then dst[k] = v end
    end
    ImRect_Copy(dst.ClipRect, src.ClipRect)
    return dst
end

local function TableColumnClone(src)
    return TableColumnCopy(ImGuiTableColumn(), src)
end

--- @class ImGuiTableInstanceData
function ImGuiTableInstanceData()
    return { TableInstanceID = 0, LastOuterHeight = 0.0, LastTopHeadersRowHeight = 0.0, LastFrozenHeight = 0.0, HoveredRowLast = -1, HoveredRowNext = -1 }
end

--- @class ImGuiTableTempData
function ImGuiTableTempData()
    return {
        WindowID = 0, TableIndex = 0, LastTimeActive = -1.0, AngledHeadersExtraWidth = 0.0,
        AngledHeadersRequests = ImVector(), ReconcileColumnsRequests = ImVector(),
        OldColumnsRawData = nil, OldColumnsData = nil, OldColumnsDataSize = 0,
        UserOuterSize = ImVec2(), DrawSplitter = ImDrawListSplitter(),
        HostBackupWorkRect = ImRect(), HostBackupParentWorkRect = ImRect(),
        HostBackupPrevLineSize = ImVec2(), HostBackupCurrLineSize = ImVec2(), HostBackupCursorMaxPos = ImVec2(),
        HostBackupColumnsOffset = 0.0, HostBackupItemWidth = 0.0, HostBackupItemWidthStackSize = 0,
    }
end

--- @class ImGuiTable
function ImGuiTable()
    return {
        ID = 0, Flags = 0, RawData = nil, TempData = nil,
        Columns = {}, ColumnsSize = 0, DisplayOrderToIndex = {}, RowCellData = {},
        EnabledMaskByDisplayOrder = {}, EnabledMaskByIndex = {}, VisibleMaskByIndex = {},
        SettingsLoadedFlags = 0, SettingsOffset = 0, LastFrameActive = -1, ColumnsCount = 0, CurrentRow = 0, CurrentColumn = 0,
        InstanceCurrent = 0, InstanceInteracted = 0, RowPosY1 = 0.0, RowPosY2 = 0.0, RowMinHeight = 0.0, RowCellPaddingY = 0.0,
        RowTextBaseline = 0.0, RowIndentOffsetX = 0.0, RowFlags = 0, LastRowFlags = 0, RowBgColorCounter = 0,
        RowBgColor = { [0] = 0, [1] = 0 }, BorderColorStrong = 0, BorderColorLight = 0, BorderX1 = 0.0, BorderX2 = 0.0,
        HostIndentX = 0.0, MinColumnWidth = 0.0, OuterPaddingX = 0.0, CellPaddingX = 0.0, CellSpacingX1 = 0.0, CellSpacingX2 = 0.0,
        InnerWidth = 0.0, ColumnsGivenWidth = 0.0, ColumnsAutoFitWidth = 0.0, ColumnsStretchSumWeights = 0.0,
        ResizedColumnNextWidth = 0.0, ResizeLockMinContentsX2 = 0.0, RefScale = 0.0, AngledHeadersHeight = 0.0, AngledHeadersSlope = 0.0,
        OuterRect = ImRect(), InnerRect = ImRect(), WorkRect = ImRect(), InnerClipRect = ImRect(), BgClipRect = ImRect(),
        Bg0ClipRectForDrawCmd = ImRect(), Bg2ClipRectForDrawCmd = ImRect(), HostClipRect = ImRect(), HostBackupInnerClipRect = ImRect(),
        OuterWindow = nil, InnerWindow = nil, ColumnsNames = {}, DrawSplitter = nil,
        InstanceDataFirst = ImGuiTableInstanceData(), InstanceDataExtra = ImVector(),
        SortSpecs = ImGuiTableSortSpecs(), SortSpecsMulti = {}, SortSpecsSingle = ImGuiTableColumnSortSpecs(),
        SortSpecsCount = 0, ColumnsEnabledCount = 0, ColumnsEnabledFixedCount = 0, DeclColumnsCount = 0, AngledHeadersCount = 0,
        HoveredColumnBody = 0, HoveredColumnBorder = 0, HighlightColumnHeader = 0, AutoFitSingleColumn = 0, ResizedColumn = 0,
        LastResizedColumn = 0, HeldHeaderColumn = 0, LastHeldHeaderColumn = 0, ReorderColumn = 0, ReorderColumnDstOrder = 0,
        LeftMostEnabledColumn = 0, RightMostEnabledColumn = 0, LeftMostStretchedColumn = 0, RightMostStretchedColumn = 0,
        ContextPopupColumn = 0, FreezeRowsRequest = 0, FreezeRowsCount = 0, FreezeColumnsRequest = 0, FreezeColumnsCount = 0,
        RowCellDataCurrent = 0, DummyDrawChannel = 0, Bg2DrawChannelCurrent = 0, Bg2DrawChannelUnfrozen = 0, NavLayer = 0,
        IsLayoutLocked = false, IsInsideRow = false, IsNewTable = false, IsInitializing = false, IsReconcileMode = false,
        IsSortSpecsDirty = false, IsUsingHeaders = false, IsContextPopupOpen = false, DisableDefaultContextMenu = false,
        IsSettingsRequestLoad = false, IsSettingsDirty = false, IsDefaultDisplayOrder = false, IsDefaultVisibility = false,
        IsResetAllRequest = false, IsResetDisplayOrderRequest = false, IsResetVisibilityRequest = false, IsUnfrozenRows = false,
        IsDefaultSizingPolicy = false, IsActiveIdAliveBeforeTable = false, IsActiveIdInTable = false,
        HasScrollbarYCurr = false, HasScrollbarYPrev = false, MemoryCompacted = false, HostSkipItems = false,
    }
end

--- @class ImGuiTableColumnSettings
function ImGuiTableColumnSettings()
    return { WidthOrWeight = 0.0, ID = 0, Index = -1, DisplayOrder = -1, SortOrder = -1, SortDirection = ImGuiSortDirection.None,
             IsEnabled = -1, IsStretch = 0, IsLoaded = false }
end

--- @class ImGuiTableSettings
function ImGuiTableSettings()
    return { ID = 0, SaveFlags = 0, RefScale = 0.0, ColumnsCount = 0, ColumnsCountMax = 0, LastUsedDate = 0, WantApply = false, Columns = {} }
end

--- @class ImGuiOldColumnData
function ImGuiOldColumnData()
    return { OffsetNorm = 0.0, OffsetNormBeforeResize = 0.0, Flags = 0, ClipRect = ImRect() }
end

--- @class ImGuiOldColumns
function ImGuiOldColumns()
    return { ID = 0, Flags = 0, IsFirstFrame = false, IsBeingResized = false, Current = 0, Count = 0, OffMinX = 0.0, OffMaxX = 0.0,
             LineMinY = 0.0, LineMaxY = 0.0, HostCursorPosY = 0.0, HostCursorMaxPosX = 0.0, HostInitialClipRect = ImRect(),
             HostBackupClipRect = ImRect(), HostBackupParentWorkRect = ImRect(), Columns = ImVector(), Splitter = ImDrawListSplitter() }
end

ImGuiOldColumnFlags = ImGuiOldColumnFlags or {
    None                   = 0,
    NoBorder               = lshift(1, 0),
    NoResize               = lshift(1, 1),
    NoPreserveWidths       = lshift(1, 2),
    NoForceWithinWindow    = lshift(1, 3),
    GrowParentContentsSize = lshift(1, 4),
}

ImGuiTableColumnFlags.NoDirectResize_ = ImGuiTableColumnFlags.NoDirectResize_ or lshift(1, 30)

local function Rect(r) return ImRect(r.Min.x, r.Min.y, r.Max.x, r.Max.y) end
local function V2(v) return ImVec2(v.x, v.y) end

----------------------------------------------------------------
-- [SECTION] Tables: Main code
----------------------------------------------------------------

-- Configuration
local TABLE_DRAW_CHANNEL_BG0 = 0
local TABLE_DRAW_CHANNEL_BG2_FROZEN = 1
local TABLE_DRAW_CHANNEL_NOCLIP = 2                    -- When using ImGuiTableFlags_NoClip (this becomes the last visible channel)
local TABLE_BORDER_SIZE = 1.0                          -- FIXME-TABLE: Currently hard-coded because of clipping assumptions with outer borders rendering.
local TABLE_RESIZE_SEPARATOR_HALF_THICKNESS = 4.0      -- Extend outside inner borders.
local TABLE_RESIZE_SEPARATOR_FEEDBACK_TIMER = 0.06     -- Delay/timer before making the hover feedback (color+cursor) visible because tables/columns tends to be more cramped.

-- Helper
local function TableFixFlags(flags, outer_window)
    -- Adjust flags: set default sizing policy
    if band(flags, ImGuiTableFlags.SizingMask_) == 0 then
        flags = bor(flags, (band(flags, ImGuiTableFlags.ScrollX) ~= 0 or band(outer_window.Flags, ImGuiWindowFlags.AlwaysAutoResize) ~= 0) and ImGuiTableFlags.SizingFixedFit or ImGuiTableFlags.SizingStretchSame)
    end

    -- Adjust flags: enable NoKeepColumnsVisible when using ImGuiTableFlags_SizingFixedSame
    if band(flags, ImGuiTableFlags.SizingMask_) == ImGuiTableFlags.SizingFixedSame then
        flags = bor(flags, ImGuiTableFlags.NoKeepColumnsVisible)
    end

    -- Adjust flags: enforce borders when resizable
    if band(flags, ImGuiTableFlags.Resizable) ~= 0 then
        flags = bor(flags, ImGuiTableFlags.BordersInnerV)
    end

    -- Adjust flags: disable NoHostExtendX/NoHostExtendY if we have any scrolling going on
    if band(flags, bor(ImGuiTableFlags.ScrollX, ImGuiTableFlags.ScrollY)) ~= 0 then
        flags = band(flags, bnot(bor(ImGuiTableFlags.NoHostExtendX, ImGuiTableFlags.NoHostExtendY)))
    end

    -- Adjust flags: NoBordersInBodyUntilResize takes priority over NoBordersInBody
    if band(flags, ImGuiTableFlags.NoBordersInBodyUntilResize) ~= 0 then
        flags = band(flags, bnot(ImGuiTableFlags.NoBordersInBody))
    end

    -- Adjust flags: disable saved settings if there's nothing to save
    if band(flags, bor(ImGuiTableFlags.Resizable, ImGuiTableFlags.Hideable, ImGuiTableFlags.Reorderable, ImGuiTableFlags.Sortable)) == 0 then
        flags = bor(flags, ImGuiTableFlags.NoSavedSettings)
    end

    -- Inherit _NoSavedSettings from top-level window (child windows always have _NoSavedSettings set)
    if band(outer_window.RootWindow.Flags, ImGuiWindowFlags.NoSavedSettings) ~= 0 then
        flags = bor(flags, ImGuiTableFlags.NoSavedSettings)
    end

    return flags
end

function ImGui.TableFindByID(id)
    local g = GImGui
    return g.Tables:GetByKey(id)
end

--- @param table_ ImGuiTable
--- @param instance_no int
function ImGui.TableGetInstanceData(table_, instance_no)
    if instance_no == 0 then
        return table_.InstanceDataFirst
    end
    return table_.InstanceDataExtra.Data[instance_no]
end

function ImGui.TableGetInstanceID(table_, instance_no)
    return ImGui.TableGetInstanceData(table_, instance_no).TableInstanceID
end

-- Read about "TABLE SIZING" at the top of this file.
--- @param str_id        string
--- @param columns_count int
--- @param flags?        ImGuiTableFlags
--- @param outer_size?   ImVec2
--- @param inner_width?  float
function ImGui.BeginTable(str_id, columns_count, flags, outer_size, inner_width)
    local id = ImGui.GetID(str_id)
    return ImGui.BeginTableEx(str_id, id, columns_count, flags, outer_size, inner_width)
end

function ImGui.BeginTableEx(name, id, columns_count, flags, outer_size, inner_width)
    if flags       == nil then flags       = 0                end
    if outer_size  == nil then outer_size  = ImVec2(0.0, 0.0) end
    if inner_width == nil then inner_width = 0.0              end

    local g = GImGui
    local outer_window = ImGui.GetCurrentWindow()
    if outer_window.SkipItems then -- Consistent with other tables + beneficial side effect that assert on miscalling EndTable() will be more visible.
        return false
    end

    -- Sanity checks
    IM_ASSERT(columns_count > 0 and columns_count < IMGUI_TABLE_MAX_COLUMNS)
    if band(flags, ImGuiTableFlags.ScrollX) ~= 0 then
        IM_ASSERT(inner_width >= 0.0)
    end

    -- If an outer size is specified ahead we will be able to early out when not visible. Exact clipping criteria may evolve.
    local use_child_window = band(flags, bor(ImGuiTableFlags.ScrollX, ImGuiTableFlags.ScrollY)) ~= 0
    local avail_size = ImGui.GetContentRegionAvail()
    local actual_outer_size = ImTrunc(ImGui.CalcItemSize(outer_size, ImMax(avail_size.x, IMGUI_WINDOW_HARD_MIN_SIZE), use_child_window and ImMax(avail_size.y, IMGUI_WINDOW_HARD_MIN_SIZE) or 0.0))
    local outer_rect = ImRect(outer_window.DC.CursorPos, outer_window.DC.CursorPos + actual_outer_size)
    local outer_window_is_measuring_size = (outer_window.AutoFitFramesX > 0) or (outer_window.AutoFitFramesY > 0) -- Doesn't apply to AlwaysAutoResize windows!
    if use_child_window and ImGui.IsClippedEx(outer_rect, 0) and not outer_window_is_measuring_size then
        ImGui.ItemSize(outer_rect)
        ImGui.ItemAdd(outer_rect, id)
        g.NextWindowData:ClearFlags()
        return false
    end

    -- Acquire storage for the table
    local table_ = g.Tables:GetOrAddByKey(id)
    if table_.Columns == nil then -- pool created a plain table
        for k, v in pairs(ImGuiTable()) do table_[k] = v end
    end

    -- Acquire temporary buffers
    local table_idx = g.Tables:GetIndex(table_)
    g.TablesTempDataStacked = g.TablesTempDataStacked + 1
    while g.TablesTempDataStacked > g.TablesTempData.Size do
        g.TablesTempData:push_back(ImGuiTableTempData())
    end
    local temp_data = g.TablesTempData.Data[g.TablesTempDataStacked]
    table_.TempData = temp_data
    temp_data.TableIndex = table_idx
    temp_data.ReconcileColumnsRequests:resize(0)
    table_.DrawSplitter = table_.TempData.DrawSplitter
    table_.DrawSplitter:Clear()

    -- Fix flags
    table_.IsDefaultSizingPolicy = band(flags, ImGuiTableFlags.SizingMask_) == 0
    flags = TableFixFlags(flags, outer_window)

    -- Initialize
    local previous_frame_active = table_.LastFrameActive
    local instance_no = (previous_frame_active ~= g.FrameCount) and 0 or (table_.InstanceCurrent + 1)
    local previous_flags = table_.Flags
    table_.ID = id
    table_.Flags = flags
    table_.LastFrameActive = g.FrameCount
    table_.OuterWindow = outer_window
    table_.InnerWindow = outer_window
    table_.ColumnsCount = columns_count
    table_.IsLayoutLocked = false
    table_.InnerWidth = inner_width
    table_.NavLayer = outer_window.DC.NavLayerCurrent
    table_.IsNewTable = (previous_frame_active == -1)
    ImVec2_Copy(temp_data.UserOuterSize, outer_size)

    -- Instance data (for instance 0, TableID == TableInstanceID)
    local instance_id
    table_.InstanceCurrent = instance_no
    if instance_no > 0 then
        IM_ASSERT(table_.ColumnsCount == columns_count, "BeginTable(): Cannot change columns count mid-frame while preserving same ID")
        if table_.InstanceDataExtra.Size < instance_no then
            table_.InstanceDataExtra:push_back(ImGuiTableInstanceData())
        end
        instance_id = ImGui.GetIDWithSeed(instance_no, ImGui.GetIDWithSeed("##Instances", nil, id)) -- Push "##Instances" followed by (int)instance_no in ID stack.
    else
        instance_id = id
    end
    local table_instance = ImGui.TableGetInstanceData(table_, table_.InstanceCurrent)
    table_instance.TableInstanceID = instance_id

    -- When not using a child window, WorkRect.Max will grow as we append contents.
    if use_child_window then
        -- Ensure no vertical scrollbar appears if we only want horizontal one, to make flag consistent
        local override_content_size = ImVec2(FLT_MAX, FLT_MAX)
        if band(flags, ImGuiTableFlags.ScrollX) ~= 0 and band(flags, ImGuiTableFlags.ScrollY) == 0 then
            override_content_size.y = FLT_MIN
        end

        -- Ensure specified width (when not specified, Stretched columns will act as if the width == OuterWidth and never lead to any scrolling).
        if band(flags, ImGuiTableFlags.ScrollX) ~= 0 and inner_width > 0.0 then
            override_content_size.x = inner_width
        end

        if override_content_size.x ~= FLT_MAX or override_content_size.y ~= FLT_MAX then
            ImGui.SetNextWindowContentSize(ImVec2((override_content_size.x ~= FLT_MAX) and override_content_size.x or 0.0, (override_content_size.y ~= FLT_MAX) and override_content_size.y or 0.0))
        end

        -- Reset scroll if we are reactivating it
        if band(previous_flags, bor(ImGuiTableFlags.ScrollX, ImGuiTableFlags.ScrollY)) == 0 then
            if band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasScroll) == 0 then
                ImGui.SetNextWindowScroll(ImVec2(0.0, 0.0))
            end
        end

        -- Create scrolling region (without border and zero window padding)
        local child_window_flags = (band(flags, ImGuiTableFlags.ScrollX) ~= 0) and ImGuiWindowFlags.HorizontalScrollbar or ImGuiWindowFlags.None
        ImGui.BeginChildEx(name, instance_id, outer_rect:GetSize(), ImGuiChildFlags.None, child_window_flags)
        table_.InnerWindow = g.CurrentWindow
        ImRect_Copy(table_.WorkRect, table_.InnerWindow.WorkRect)
        ImRect_Copy(table_.OuterRect, table_.InnerWindow:Rect())
        ImRect_Copy(table_.InnerRect, table_.InnerWindow.InnerRect)
        IM_ASSERT(table_.InnerWindow.WindowPadding.x == 0.0 and table_.InnerWindow.WindowPadding.y == 0.0 and table_.InnerWindow.WindowBorderSize == 0.0)

        -- Allow submitting when host is measuring
        if table_.InnerWindow.SkipItems and outer_window_is_measuring_size then
            table_.InnerWindow.SkipItems = false
        end

        -- When using multiple instances, ensure they have the same amount of horizontal decorations (aka vertical scrollbar) so stretched columns can be aligned
        if instance_no == 0 then
            table_.HasScrollbarYPrev = table_.HasScrollbarYCurr
            table_.HasScrollbarYCurr = false
        end
        table_.HasScrollbarYCurr = table_.HasScrollbarYCurr or table_.InnerWindow.ScrollbarY
    else
        -- For non-scrolling tables, WorkRect == OuterRect == InnerRect.
        ImRect_Copy(table_.WorkRect, outer_rect)
        ImRect_Copy(table_.OuterRect, outer_rect)
        ImRect_Copy(table_.InnerRect, outer_rect)
        table_.HasScrollbarYPrev = false
        table_.HasScrollbarYCurr = false
        table_.InnerWindow.DC.TreeDepth = table_.InnerWindow.DC.TreeDepth + 1 -- This is designed to always linking ImGuiTreeNodeFlags_DrawLines linking across a table
    end

    -- Push a standardized ID for both child-using and not-child-using tables
    ImGui.PushOverrideID(id)
    if instance_no > 0 then
        ImGui.PushOverrideID(instance_id)
    end

    -- Backup a copy of host window members we will modify
    local inner_window = table_.InnerWindow
    table_.HostIndentX = inner_window.DC.Indent.x
    ImRect_Copy(table_.HostClipRect, inner_window.ClipRect)
    table_.HostSkipItems = inner_window.SkipItems
    temp_data.WindowID = inner_window.ID
    ImRect_Copy(temp_data.HostBackupWorkRect, inner_window.WorkRect)
    ImRect_Copy(temp_data.HostBackupParentWorkRect, inner_window.ParentWorkRect)
    temp_data.HostBackupColumnsOffset = outer_window.DC.ColumnsOffset.x
    ImVec2_Copy(temp_data.HostBackupPrevLineSize, inner_window.DC.PrevLineSize)
    ImVec2_Copy(temp_data.HostBackupCurrLineSize, inner_window.DC.CurrLineSize)
    ImVec2_Copy(temp_data.HostBackupCursorMaxPos, inner_window.DC.CursorMaxPos)
    temp_data.HostBackupItemWidth = outer_window.DC.ItemWidth
    temp_data.HostBackupItemWidthStackSize = outer_window.DC.ItemWidthStack.Size
    inner_window.DC.PrevLineSize.x = 0.0; inner_window.DC.PrevLineSize.y = 0.0
    inner_window.DC.CurrLineSize.x = 0.0; inner_window.DC.CurrLineSize.y = 0.0

    -- Make borders not overlap our contents by offsetting HostClipRect (#6765, #7428, #3752)
    if inner_window ~= outer_window then
        local border_size = TABLE_BORDER_SIZE
        if band(flags, ImGuiTableFlags.BordersOuterV) ~= 0 then
            table_.HostClipRect.Min.x = ImMin(table_.HostClipRect.Min.x + border_size, table_.HostClipRect.Max.x)
            if inner_window.DecoOuterSizeX2 == 0.0 then
                table_.HostClipRect.Max.x = ImMax(table_.HostClipRect.Max.x - border_size, table_.HostClipRect.Min.x)
            end
        end
        if band(flags, ImGuiTableFlags.BordersOuterH) ~= 0 then
            table_.HostClipRect.Min.y = ImMin(table_.HostClipRect.Min.y + border_size, table_.HostClipRect.Max.y)
            if inner_window.DecoOuterSizeY2 == 0.0 then
                table_.HostClipRect.Max.y = ImMax(table_.HostClipRect.Max.y - border_size, table_.HostClipRect.Min.y)
            end
        end
    end

    -- Padding and Spacing
    local pad_outer_x
    if band(flags, ImGuiTableFlags.NoPadOuterX) ~= 0 then pad_outer_x = false
    elseif band(flags, ImGuiTableFlags.PadOuterX) ~= 0 then pad_outer_x = true
    else pad_outer_x = band(flags, ImGuiTableFlags.BordersOuterV) ~= 0 end
    local pad_inner_x = band(flags, ImGuiTableFlags.NoPadInnerX) == 0
    local inner_spacing_for_border = (band(flags, ImGuiTableFlags.BordersInnerV) ~= 0) and TABLE_BORDER_SIZE or 0.0
    local inner_spacing_explicit = (pad_inner_x and band(flags, ImGuiTableFlags.BordersInnerV) == 0) and g.Style.CellPadding.x or 0.0
    local inner_padding_explicit = (pad_inner_x and band(flags, ImGuiTableFlags.BordersInnerV) ~= 0) and g.Style.CellPadding.x or 0.0
    table_.CellSpacingX1 = inner_spacing_explicit + inner_spacing_for_border
    table_.CellSpacingX2 = inner_spacing_explicit
    table_.CellPaddingX = inner_padding_explicit

    local outer_padding_for_border = (band(flags, ImGuiTableFlags.BordersOuterV) ~= 0) and TABLE_BORDER_SIZE or 0.0
    local outer_padding_explicit = pad_outer_x and g.Style.CellPadding.x or 0.0
    table_.OuterPaddingX = (outer_padding_for_border + outer_padding_explicit) - table_.CellPaddingX

    table_.CurrentColumn = -1
    table_.CurrentRow = -1
    table_.RowBgColorCounter = 0
    table_.LastRowFlags = ImGuiTableRowFlags.None
    ImRect_Copy(table_.InnerClipRect, (inner_window == outer_window) and table_.WorkRect or inner_window.ClipRect)
    table_.InnerClipRect:ClipWith(table_.WorkRect)     -- We need this to honor inner_width
    table_.InnerClipRect:ClipWithFull(table_.HostClipRect)
    table_.InnerClipRect.Max.y = (band(flags, ImGuiTableFlags.NoHostExtendY) ~= 0) and ImMin(table_.InnerClipRect.Max.y, inner_window.WorkRect.Max.y) or table_.HostClipRect.Max.y

    table_.RowPosY1 = table_.WorkRect.Min.y -- This is needed somehow
    table_.RowPosY2 = table_.WorkRect.Min.y
    table_.RowTextBaseline = 0.0 -- This will be cleared again by TableBeginRow()
    table_.RowCellPaddingY = 0.0
    table_.FreezeRowsRequest = 0; table_.FreezeRowsCount = 0 -- This will be setup by TableSetupScrollFreeze(), if any
    table_.FreezeColumnsRequest = 0; table_.FreezeColumnsCount = 0
    table_.IsUnfrozenRows = true
    table_.DeclColumnsCount = 0; table_.AngledHeadersCount = 0
    if previous_frame_active + 1 < g.FrameCount then
        table_.IsActiveIdInTable = false
    end
    table_.AngledHeadersHeight = 0.0
    temp_data.AngledHeadersExtraWidth = 0.0

    -- Using opaque colors facilitate overlapping lines of the grid, otherwise we'd need to improve TableDrawBorders()
    table_.BorderColorStrong = ImGui.GetColorU32(ImGuiCol.TableBorderStrong)
    table_.BorderColorLight = ImGui.GetColorU32(ImGuiCol.TableBorderLight)

    -- Make table current
    g.CurrentTable = table_
    inner_window.DC.NavIsScrollPushableX = false -- Shortcut for NavUpdateCurrentWindowIsScrollPushableX();
    outer_window.DC.CurrentTableIdx = table_idx
    if inner_window ~= outer_window then -- So EndChild() within the inner window can restore the table properly.
        inner_window.DC.CurrentTableIdx = table_idx
    end

    if band(previous_flags, ImGuiTableFlags.Reorderable) ~= 0 and band(flags, ImGuiTableFlags.Reorderable) == 0 then
        table_.IsResetDisplayOrderRequest = true
    end

    -- Mark as used to avoid GC
    while table_idx >= g.TablesLastTimeActive.Size do
        g.TablesLastTimeActive:push_back(-1.0)
    end
    g.TablesLastTimeActive.Data[table_idx + 1] = g.Time
    temp_data.LastTimeActive = g.Time
    table_.MemoryCompacted = false

    -- Setup memory buffer (clear data if columns count changed)
    local old_columns_count = table_.ColumnsSize
    if old_columns_count ~= 0 and old_columns_count ~= columns_count then
        -- Attempt to preserve width and other settings on column count/specs change (#4046, #9108)
        IMGUI_DEBUG_LOG_TABLE("[table] Table 0x%08X column count %d -> %d, recreating storage.\n", table_.ID, old_columns_count, columns_count)
        IM_ASSERT(temp_data.OldColumnsRawData == nil)
        temp_data.OldColumnsRawData = table_.RawData -- Freed during layout
        temp_data.OldColumnsData = table_.Columns
        temp_data.OldColumnsDataSize = table_.ColumnsSize
        for n = 0, temp_data.OldColumnsDataSize - 1 do
            temp_data.OldColumnsData[n].IsNeedReconcileSrc = true
        end
        table_.RawData = nil
    end
    if table_.RawData == nil then
        ImGui.TableBeginInitMemory(table_, columns_count)
        table_.IsInitializing = true
    end
    if table_.IsResetAllRequest then
        ImGui.TableResetSettings(table_)
    end
    if table_.IsInitializing then
        -- Initialize
        if table_.IsNewTable then
            table_.SettingsOffset = -1
            table_.IsSettingsRequestLoad = true
        end
        table_.IsSortSpecsDirty = true
        table_.IsSettingsDirty = true -- Records itself into .ini file even when in default state (#7934)
        table_.IsReconcileMode = false
        table_.InstanceInteracted = -1
        table_.ContextPopupColumn = -1
        table_.ReorderColumn = -1; table_.ReorderColumnDstOrder = -1; table_.ResizedColumn = -1; table_.LastResizedColumn = -1
        table_.AutoFitSingleColumn = -1
        table_.HoveredColumnBody = -1; table_.HoveredColumnBorder = -1
        for n = 0, columns_count - 1 do
            local column = table_.Columns[n]
            if temp_data.OldColumnsData and n < temp_data.OldColumnsDataSize then
                TableColumnCopy(column, temp_data.OldColumnsData[n])
            else
                local width_auto = column.WidthAuto
                TableColumnCopy(column, ImGuiTableColumn())
                column.WidthAuto = width_auto
                column.IsPreserveWidthAuto = true -- Preserve WidthAuto when reinitializing a live table: not technically necessary but remove a visible flicker
                column.IsEnabled = true; column.IsUserEnabled = true; column.IsUserEnabledNextFrame = true
                column.DisplayOrder = n
            end
            table_.DisplayOrderToIndex[n] = column.DisplayOrder
        end
    end

    -- Load settings
    if table_.IsSettingsRequestLoad then
        ImGui.TableLoadSettings(table_)
    end

    -- Disable output until user calls TableNextRow() or TableNextColumn() leading to the TableUpdateLayout() call..
    inner_window.SkipItems = true

    -- Clear names
    if #table_.ColumnsNames > 0 then
        table.clear(table_.ColumnsNames)
    end

    return true
end

function ImGui.TableBeginInitMemory(table_, columns_count)
    table_.RawData = true
    table_.Columns = {}
    table_.DisplayOrderToIndex = {}
    table_.RowCellData = {}
    for n = 0, columns_count - 1 do
        table_.Columns[n] = ImGuiTableColumn()
        table_.Columns[n].WidthAuto = 0.0
        table_.DisplayOrderToIndex[n] = 0
        table_.RowCellData[n] = { BgColor = 0, Column = 0 }
    end
    table_.ColumnsSize = columns_count
    table_.EnabledMaskByDisplayOrder = {}
    table_.EnabledMaskByIndex = {}
    table_.VisibleMaskByIndex = {}
end

-- Apply queued resizing/reordering/hiding requests
function ImGui.TableApplyQueuedRequests(table_)
    -- Handle resizing request
    if table_.InstanceCurrent == 0 then
        if table_.ResizedColumn ~= -1 and table_.ResizedColumnNextWidth ~= FLT_MAX then
            ImGui.TableSetColumnWidth(table_.ResizedColumn, table_.ResizedColumnNextWidth)
        end
        table_.LastResizedColumn = table_.ResizedColumn
        table_.ResizedColumnNextWidth = FLT_MAX
        table_.ResizedColumn = -1

        -- Process auto-fit for single column, which is a special case for stretch columns and fixed columns with FixedSame policy.
        if table_.AutoFitSingleColumn ~= -1 then
            ImGui.TableSetColumnWidth(table_.AutoFitSingleColumn, table_.Columns[table_.AutoFitSingleColumn].WidthAuto)
            table_.AutoFitSingleColumn = -1
        end
    end

    -- Handle reordering request
    if table_.InstanceCurrent == 0 then
        table_.LastHeldHeaderColumn = table_.HeldHeaderColumn
        table_.HeldHeaderColumn = -1
        if table_.ReorderColumn ~= -1 and table_.ReorderColumnDstOrder ~= -1 then
            ImGui.TableSetColumnDisplayOrder(table_, table_.ReorderColumn, table_.ReorderColumnDstOrder)
            table_.ReorderColumnDstOrder = -1
        end

        -- Release
        local g = GImGui
        if g.ActiveId == 0 then -- FIXME: Need to revisit. See 38f5e5a.
            table_.ReorderColumn = -1
        end
    end

    -- Handle display order / visibility reset requests
    if table_.IsResetDisplayOrderRequest then
        for n = 0, table_.ColumnsCount - 1 do
            table_.Columns[n].DisplayOrder = n
            table_.DisplayOrderToIndex[n] = n
        end
        table_.IsResetDisplayOrderRequest = false
        table_.IsSettingsDirty = true
    end
    if table_.IsResetVisibilityRequest then
        for n = 0, table_.ColumnsSize - 1 do
            local column = table_.Columns[n]
            local v = band(column.Flags, ImGuiTableColumnFlags.DefaultHide) == 0
            column.IsUserEnabled = v; column.IsUserEnabledNextFrame = v
        end
        table_.IsResetVisibilityRequest = false
        table_.IsSettingsDirty = true
    end
end

-- Apply immediately. See TableQueueSetColumnDisplayOrder() for additional checks/constraints.
function ImGui.TableSetColumnDisplayOrder(table_, column_n, dst_order)
    IM_ASSERT(column_n >= 0 and column_n < table_.ColumnsCount)
    IM_ASSERT(dst_order >= 0 and dst_order < table_.ColumnsCount)

    local src_column = table_.Columns[column_n]
    local src_order = src_column.DisplayOrder
    if src_order == dst_order then
        return
    end
    local reorder_dir = (dst_order < src_order) and -1 or 1

    src_column.DisplayOrder = dst_order
    local order_n = src_order + reorder_dir
    while order_n ~= dst_order + reorder_dir do
        local c = table_.Columns[table_.DisplayOrderToIndex[order_n]]
        c.DisplayOrder = c.DisplayOrder - reorder_dir
        order_n = order_n + reorder_dir
    end

    -- Display order is stored in both columns->IndexDisplayOrder and table->DisplayOrder[]. Rebuild later from the former.
    for n = 0, table_.ColumnsCount - 1 do
        table_.DisplayOrderToIndex[table_.Columns[n].DisplayOrder] = n
    end
    table_.IsSettingsDirty = true
end

local function TableGetMaxDisplayOrderAllowed(table_, src_order, dst_order)
    dst_order = ImClamp(dst_order, 0, table_.ColumnsCount - 1)
    if src_order == dst_order then
        return dst_order
    end

    -- Cannot cross over the frozen column limit when interactively reordering.
    if table_.FreezeColumnsRequest > 0 then
        dst_order = (src_order < table_.FreezeColumnsRequest) and ImMin(dst_order, table_.FreezeColumnsRequest - 1) or ImMax(dst_order, table_.FreezeColumnsRequest)
    end

    -- Cannot cross over a column with the ImGuiTableColumnFlags_NoReorder flag.
    local reorder_dir = (src_order < dst_order) and 1 or -1
    local order_n = src_order
    while (src_order < dst_order and order_n <= dst_order) or (dst_order < src_order and order_n >= dst_order) do
        if band(table_.Columns[table_.DisplayOrderToIndex[order_n]].Flags, ImGuiTableColumnFlags.NoReorder) ~= 0 then
            dst_order = (order_n == src_order) and src_order or (order_n - reorder_dir)
            break
        end
        order_n = order_n + reorder_dir
    end
    return dst_order
end

-- Reorder requested by user interaction.
function ImGui.TableQueueSetColumnDisplayOrder(table_, column_n, dst_order)
    local src_order = table_.Columns[column_n].DisplayOrder
    table_.ReorderColumn = column_n
    table_.ReorderColumnDstOrder = -1
    dst_order = TableGetMaxDisplayOrderAllowed(table_, src_order, dst_order)
    if table_.IsLayoutLocked and dst_order == src_order then -- We allow calling the function before layout w/ reconcile so don't early out.
        return
    end
    table_.ReorderColumnDstOrder = dst_order
end

-- Adjust flags: default width mode + stretch columns are not allowed when auto extending
local function TableSetupColumnFlags(table_, column, column_n, flags_in)
    local flags = flags_in

    -- Sizing Policy
    if band(flags, ImGuiTableColumnFlags.WidthMask_) == 0 then
        local table_sizing_policy = band(table_.Flags, ImGuiTableFlags.SizingMask_)
        if table_sizing_policy == ImGuiTableFlags.SizingFixedFit or table_sizing_policy == ImGuiTableFlags.SizingFixedSame then
            flags = bor(flags, ImGuiTableColumnFlags.WidthFixed)
        else
            flags = bor(flags, ImGuiTableColumnFlags.WidthStretch)
        end
    else
        IM_ASSERT(ImIsPowerOfTwo(band(flags, ImGuiTableColumnFlags.WidthMask_))) -- Check that only 1 of each set is used.
    end

    -- Resize
    if band(table_.Flags, ImGuiTableFlags.Resizable) == 0 then
        flags = bor(flags, ImGuiTableColumnFlags.NoResize)
    end

    -- Sorting
    if band(flags, ImGuiTableColumnFlags.NoSortAscending) ~= 0 and band(flags, ImGuiTableColumnFlags.NoSortDescending) ~= 0 then
        flags = bor(flags, ImGuiTableColumnFlags.NoSort)
    end

    -- Indentation
    if band(flags, ImGuiTableColumnFlags.IndentMask_) == 0 then
        flags = bor(flags, (column_n == 0) and ImGuiTableColumnFlags.IndentEnable or ImGuiTableColumnFlags.IndentDisable)
    end

    -- Preserve status flags
    column.Flags = bor(flags, band(column.Flags, ImGuiTableColumnFlags.StatusMask_))

    -- Build an ordered list of available sort directions
    column.SortDirectionsAvailCount = 0; column.SortDirectionsAvailMask = 0; column.SortDirectionsAvailList = 0
    if band(table_.Flags, ImGuiTableFlags.Sortable) ~= 0 then
        local count, mask, list = 0, 0, 0
        local Asc, Desc = ImGuiSortDirection.Ascending, ImGuiSortDirection.Descending
        if band(flags, ImGuiTableColumnFlags.PreferSortAscending) ~= 0 and band(flags, ImGuiTableColumnFlags.NoSortAscending) == 0 then mask = bor(mask, lshift(1, Asc)); list = bor(list, lshift(Asc, lshift(count, 1))); count = count + 1 end
        if band(flags, ImGuiTableColumnFlags.PreferSortDescending) ~= 0 and band(flags, ImGuiTableColumnFlags.NoSortDescending) == 0 then mask = bor(mask, lshift(1, Desc)); list = bor(list, lshift(Desc, lshift(count, 1))); count = count + 1 end
        if band(flags, ImGuiTableColumnFlags.PreferSortAscending) == 0 and band(flags, ImGuiTableColumnFlags.NoSortAscending) == 0 then mask = bor(mask, lshift(1, Asc)); list = bor(list, lshift(Asc, lshift(count, 1))); count = count + 1 end
        if band(flags, ImGuiTableColumnFlags.PreferSortDescending) == 0 and band(flags, ImGuiTableColumnFlags.NoSortDescending) == 0 then mask = bor(mask, lshift(1, Desc)); list = bor(list, lshift(Desc, lshift(count, 1))); count = count + 1 end
        if band(table_.Flags, ImGuiTableFlags.SortTristate) ~= 0 or count == 0 then mask = bor(mask, lshift(1, ImGuiSortDirection.None)); count = count + 1 end
        column.SortDirectionsAvailList = band(list, 0xFF)
        column.SortDirectionsAvailMask = band(mask, 0xFF)
        column.SortDirectionsAvailCount = count
        ImGui.TableFixColumnSortDirection(table_, column)
    end
end

-- Layout columns for the frame. This is in essence the followup to BeginTable() and this is our largest function.
-- Runs on the first call to TableNextRow(), to give a chance for TableSetupColumn() and other TableSetupXXXXX() functions to be called first.
function ImGui.TableUpdateLayout(table_)
    local g = GImGui
    local temp_data = table_.TempData
    IM_ASSERT(table_.IsLayoutLocked == false)
    local columns_count = table_.ColumnsCount

    -- Reconcile moved columns
    if temp_data.ReconcileColumnsRequests.Size > 0 then
        ImGui.TableReconcileColumns(table_)
    end
    if temp_data.OldColumnsRawData then
        temp_data.OldColumnsRawData = nil
        temp_data.OldColumnsData = nil
        temp_data.OldColumnsDataSize = 0
    end

    -- Apply columns settings
    if table_.IsSettingsRequestLoad then
        ImGui.TableLoadSettingsForColumns(table_)
    end
    if table_.IsInitializing or table_.IsSettingsRequestLoad then
        for n = 0, table_.ColumnsSize - 1 do
            local column = table_.Columns[n]
            local init_flags
            if table_.IsSettingsRequestLoad then
                init_flags = column.IsLoadedSettings and bnot(table_.SettingsLoadedFlags) or bnot(0)
            else
                init_flags = column.IsJustCreated and bnot(0) or 0
            end
            ImGui.TableInitColumnDefaults(table_, column, n, init_flags)
        end
        ImGui.TableFixDisplayOrder(table_) -- Call even for non _Reorderable table as we loaded .ini data.
        table_.IsSettingsRequestLoad = false
    end

    -- Apply queued resizing/reordering/hiding requests
    ImGui.TableApplyQueuedRequests(table_)

    -- Handle DPI/font resize
    local new_ref_scale_unit = g.FontSize
    if table_.RefScale ~= 0.0 and table_.RefScale ~= new_ref_scale_unit then
        local scale_factor = new_ref_scale_unit / table_.RefScale
        for n = 0, columns_count - 1 do
            table_.Columns[n].WidthRequest = table_.Columns[n].WidthRequest * scale_factor
        end
    end
    table_.RefScale = new_ref_scale_unit

    local table_sizing_policy = band(table_.Flags, ImGuiTableFlags.SizingMask_)
    table_.IsDefaultDisplayOrder = true; table_.IsDefaultVisibility = true
    table_.ColumnsEnabledCount = 0
    BitArrayClearAll(table_.EnabledMaskByIndex)
    BitArrayClearAll(table_.EnabledMaskByDisplayOrder)
    table_.LeftMostEnabledColumn = -1
    table_.MinColumnWidth = ImMax(1.0, g.Style.FramePadding.x * 1.0) -- g.Style.ColumnsMinSpacing; // FIXME-TABLE

    -- [Part 1] Apply/lock Enabled and Order states. Calculate auto/ideal width for columns. Count fixed/stretch columns.
    local count_fixed = 0
    local count_stretch = 0
    local prev_visible_column_idx = -1
    local has_auto_fit_request = false
    local has_resizable = false
    local stretch_sum_width_auto = 0.0
    local fixed_max_width_auto = 0.0
    for order_n = 0, columns_count - 1 do
        local column_n = table_.DisplayOrderToIndex[order_n]
        local column = table_.Columns[column_n]

        -- Clear column setup if not submitted by user. Currently we make it mandatory to call TableSetupColumn() every frame.
        if table_.DeclColumnsCount <= column_n then
            TableSetupColumnFlags(table_, column, column_n, ImGuiTableColumnFlags.None)
            column.NameOffset = -1
            column.ID = 0; column.UserData = 0
            column.InitStretchWeightOrWidth = -1.0
        end

        -- Update Enabled state, mark settings and sort specs dirty
        if band(table_.Flags, ImGuiTableFlags.Hideable) == 0 or band(column.Flags, ImGuiTableColumnFlags.NoHide) ~= 0 then
            column.IsUserEnabledNextFrame = true
        end
        if column.IsUserEnabled ~= column.IsUserEnabledNextFrame then
            column.IsUserEnabled = column.IsUserEnabledNextFrame
            table_.IsSettingsDirty = true
        end
        column.IsEnabled = column.IsUserEnabled and band(column.Flags, ImGuiTableColumnFlags.Disabled) == 0
        column.IsJustCreated = false

        if column.IsEnabled ~= (band(column.Flags, ImGuiTableColumnFlags.DefaultHide) == 0) then
            table_.IsDefaultVisibility = false
        end
        if column_n ~= order_n then
            table_.IsDefaultDisplayOrder = false
        end

        if column.SortOrder ~= -1 and not column.IsEnabled then
            table_.IsSortSpecsDirty = true
        end
        if column.SortOrder > 0 and band(table_.Flags, ImGuiTableFlags.SortMulti) == 0 then
            table_.IsSortSpecsDirty = true
        end

        -- Auto-fit unsized columns
        local start_auto_fit
        if band(column.Flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 then
            start_auto_fit = column.WidthRequest < 0.0
        else
            start_auto_fit = column.StretchWeight < 0.0
        end
        if start_auto_fit then
            column.AutoFitQueue = lshift(1, 3) - 1 -- Fit for three frames
            column.CannotSkipItemsQueue = lshift(1, 3) - 1
        end

        if not column.IsEnabled then
            column.IndexWithinEnabledSet = -1
        else
            -- Mark as enabled and link to previous/next enabled column
            column.PrevEnabledColumn = prev_visible_column_idx
            column.NextEnabledColumn = -1
            if prev_visible_column_idx ~= -1 then
                table_.Columns[prev_visible_column_idx].NextEnabledColumn = column_n
            else
                table_.LeftMostEnabledColumn = column_n
            end
            column.IndexWithinEnabledSet = table_.ColumnsEnabledCount
            table_.ColumnsEnabledCount = table_.ColumnsEnabledCount + 1
            BitArraySet(table_.EnabledMaskByIndex, column_n)
            BitArraySet(table_.EnabledMaskByDisplayOrder, column.DisplayOrder)
            prev_visible_column_idx = column_n
            IM_ASSERT(column.IndexWithinEnabledSet <= column.DisplayOrder)

            -- Calculate ideal/auto column width (that's the width required for all contents to be visible without clipping)
            if not column.IsPreserveWidthAuto and table_.InstanceCurrent == 0 then
                column.WidthAuto = ImGui.TableGetColumnWidthAuto(table_, column)
            end

            -- Non-resizable columns keep their requested width (apply user value regardless of IsPreserveWidthAuto)
            local column_is_resizable = band(column.Flags, ImGuiTableColumnFlags.NoResize) == 0
            if column_is_resizable then
                has_resizable = true
            end
            if band(column.Flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 and column.InitStretchWeightOrWidth > 0.0 and not column_is_resizable then
                column.WidthAuto = column.InitStretchWeightOrWidth
            end

            if column.AutoFitQueue ~= 0x00 then
                has_auto_fit_request = true
            end
            if band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0 then
                stretch_sum_width_auto = stretch_sum_width_auto + column.WidthAuto
                count_stretch = count_stretch + 1
            else
                fixed_max_width_auto = ImMax(fixed_max_width_auto, column.WidthAuto)
                count_fixed = count_fixed + 1
            end
        end
    end
    if band(table_.Flags, ImGuiTableFlags.Sortable) ~= 0 and table_.SortSpecsCount == 0 and band(table_.Flags, ImGuiTableFlags.SortTristate) == 0 then
        table_.IsSortSpecsDirty = true
    end
    table_.RightMostEnabledColumn = prev_visible_column_idx
    IM_ASSERT(table_.LeftMostEnabledColumn >= 0 and table_.RightMostEnabledColumn >= 0)

    -- [Part 2] Disable child window clipping while fitting columns.
    if has_auto_fit_request and table_.OuterWindow ~= table_.InnerWindow then
        table_.InnerWindow.SkipItems = false
    end
    if has_auto_fit_request then
        table_.IsSettingsDirty = true
    end

    -- [Part 3] Fix column flags and record a few extra information.
    local sum_width_requests = 0.0
    local stretch_sum_weights = 0.0
    table_.LeftMostStretchedColumn = -1; table_.RightMostStretchedColumn = -1
    for column_n = 0, columns_count - 1 do
        if BitTest(table_.EnabledMaskByIndex, column_n) then
            local column = table_.Columns[column_n]

            local column_is_resizable = band(column.Flags, ImGuiTableColumnFlags.NoResize) == 0
            if band(column.Flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 then
                -- Apply same widths policy
                local width_auto = column.WidthAuto
                if table_sizing_policy == ImGuiTableFlags.SizingFixedSame and (column.AutoFitQueue ~= 0x00 or not column_is_resizable) then
                    width_auto = fixed_max_width_auto
                end

                -- Apply automatic width
                if column.AutoFitQueue ~= 0x00 then
                    column.WidthRequest = width_auto
                elseif band(column.Flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 and not column_is_resizable and column.IsRequestOutput then
                    column.WidthRequest = width_auto
                end

                -- FIXME-TABLE: Increase minimum size during init frame to avoid biasing auto-fitting widgets
                if column.AutoFitQueue > 0x01 and table_.IsInitializing and not column.IsPreserveWidthAuto then
                    column.WidthRequest = ImMax(column.WidthRequest, table_.MinColumnWidth * 4.0) -- FIXME-TABLE: Another constant/scale?
                end
                sum_width_requests = sum_width_requests + column.WidthRequest
            else
                -- Initialize stretch weight
                if column.AutoFitQueue ~= 0x00 or column.StretchWeight < 0.0 or not column_is_resizable then
                    if column.InitStretchWeightOrWidth > 0.0 then
                        column.StretchWeight = column.InitStretchWeightOrWidth
                    elseif table_sizing_policy == ImGuiTableFlags.SizingStretchProp then
                        column.StretchWeight = (column.WidthAuto / stretch_sum_width_auto) * count_stretch
                    else
                        column.StretchWeight = 1.0
                    end
                end

                stretch_sum_weights = stretch_sum_weights + column.StretchWeight
                if table_.LeftMostStretchedColumn == -1 or table_.Columns[table_.LeftMostStretchedColumn].DisplayOrder > column.DisplayOrder then
                    table_.LeftMostStretchedColumn = column_n
                end
                if table_.RightMostStretchedColumn == -1 or table_.Columns[table_.RightMostStretchedColumn].DisplayOrder < column.DisplayOrder then
                    table_.RightMostStretchedColumn = column_n
                end
            end
            column.IsPreserveWidthAuto = false
            sum_width_requests = sum_width_requests + table_.CellPaddingX * 2.0
        end
    end
    table_.ColumnsEnabledFixedCount = count_fixed
    table_.ColumnsStretchSumWeights = stretch_sum_weights

    -- [Part 4] Apply final widths based on requested widths
    local work_rect = Rect(table_.WorkRect)
    local width_spacings = (table_.OuterPaddingX * 2.0) + (table_.CellSpacingX1 + table_.CellSpacingX2) * (table_.ColumnsEnabledCount - 1)
    local width_removed = (table_.HasScrollbarYPrev and not table_.InnerWindow.ScrollbarY) and g.Style.ScrollbarSize or 0.0 -- To synchronize decoration width of synced tables with mismatching scrollbar state (#5920)
    local width_avail = ImMax(1.0, ((band(table_.Flags, ImGuiTableFlags.ScrollX) ~= 0 and table_.InnerWidth == 0.0) and table_.InnerClipRect:GetWidth() or work_rect:GetWidth()) - width_removed)
    local width_avail_for_stretched_columns = width_avail - width_spacings - sum_width_requests
    local width_remaining_for_stretched_columns = width_avail_for_stretched_columns
    table_.ColumnsGivenWidth = width_spacings + (table_.CellPaddingX * 2.0) * table_.ColumnsEnabledCount
    for column_n = 0, columns_count - 1 do
        if BitTest(table_.EnabledMaskByIndex, column_n) then
            local column = table_.Columns[column_n]

            -- Allocate width for stretched/weighted columns (StretchWeight gets converted into WidthRequest)
            if band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0 then
                local weight_ratio = column.StretchWeight / stretch_sum_weights
                column.WidthRequest = IM_TRUNC(ImMax(width_avail_for_stretched_columns * weight_ratio, table_.MinColumnWidth) + 0.01)
                width_remaining_for_stretched_columns = width_remaining_for_stretched_columns - column.WidthRequest
            end

            -- [Resize Rule 1] The right-most Visible column is not resizable if there is at least one Stretch column
            if column.NextEnabledColumn == -1 and table_.LeftMostStretchedColumn ~= -1 then
                column.Flags = bor(column.Flags, ImGuiTableColumnFlags.NoDirectResize_)
            end

            -- Assign final width, record width in case we will need to shrink
            column.WidthGiven = ImTrunc(ImMax(column.WidthRequest, table_.MinColumnWidth))
            table_.ColumnsGivenWidth = table_.ColumnsGivenWidth + column.WidthGiven
        end
    end

    -- [Part 5] Redistribute stretch remainder width due to rounding (remainder width is < 1.0f * number of Stretch column).
    if width_remaining_for_stretched_columns >= 1.0 and band(table_.Flags, ImGuiTableFlags.PreciseWidths) == 0 then
        local order_n = columns_count - 1
        while stretch_sum_weights > 0.0 and width_remaining_for_stretched_columns >= 1.0 and order_n >= 0 do
            if BitTest(table_.EnabledMaskByDisplayOrder, order_n) then
                local column = table_.Columns[table_.DisplayOrderToIndex[order_n]]
                if band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0 then
                    column.WidthRequest = column.WidthRequest + 1.0
                    column.WidthGiven = column.WidthGiven + 1.0
                    width_remaining_for_stretched_columns = width_remaining_for_stretched_columns - 1.0
                end
            end
            order_n = order_n - 1
        end
    end

    -- Determine if table is hovered which will be used to flag columns as hovered.
    local table_instance = ImGui.TableGetInstanceData(table_, table_.InstanceCurrent)
    table_instance.HoveredRowLast = table_instance.HoveredRowNext
    table_instance.HoveredRowNext = -1
    table_.HoveredColumnBody = -1; table_.HoveredColumnBorder = -1
    local mouse_hit_rect = ImRect(table_.OuterRect.Min.x, table_.OuterRect.Min.y, table_.OuterRect.Max.x, ImMax(table_.OuterRect.Max.y, table_.OuterRect.Min.y + table_instance.LastOuterHeight))
    local backup_active_id = g.ActiveId
    g.ActiveId = 0
    local is_hovering_table = ImGui.ItemHoverable(mouse_hit_rect, 0, ImGuiItemFlags.None)
    g.ActiveId = backup_active_id

    -- Determine skewed MousePos.x to support angled headers.
    local mouse_skewed_x = g.IO.MousePos.x
    if table_.AngledHeadersHeight > 0.0 then
        if g.IO.MousePos.y >= table_.OuterRect.Min.y and g.IO.MousePos.y <= table_.OuterRect.Min.y + table_.AngledHeadersHeight then
            mouse_skewed_x = mouse_skewed_x + ImTrunc((table_.OuterRect.Min.y + table_.AngledHeadersHeight - g.IO.MousePos.y) * table_.AngledHeadersSlope)
        end
    end

    -- [Part 6] Setup final position, offset, skip/clip states and clipping rectangles, detect hovered column
    local has_at_least_one_column_requesting_output = false
    local offset_x_frozen = (table_.FreezeColumnsCount > 0)
    local offset_x = ((table_.FreezeColumnsCount > 0) and table_.OuterRect.Min.x or work_rect.Min.x) + table_.OuterPaddingX - table_.CellSpacingX1
    local host_clip_rect = Rect(table_.InnerClipRect)
    BitArrayClearAll(table_.VisibleMaskByIndex)
    for order_n = 0, columns_count - 1 do
        local column_n = table_.DisplayOrderToIndex[order_n]
        local column = table_.Columns[column_n]

        -- Initial nav layer: using FreezeRowsCount, NOT FreezeRowsRequest, so Header line changes layer when frozen
        column.NavLayerCurrent = (table_.FreezeRowsCount > 0) and ImGuiNavLayer.Menu or table_.NavLayer

        if offset_x_frozen and table_.FreezeColumnsCount == order_n then
            offset_x = offset_x + work_rect.Min.x - table_.OuterRect.Min.x
            offset_x_frozen = false
        end

        -- Clear status flags
        column.Flags = band(column.Flags, bnot(ImGuiTableColumnFlags.StatusMask_))

        if not BitTest(table_.EnabledMaskByDisplayOrder, order_n) then
            -- Hidden column: clear a few fields and we are done with it for the remainder of the function.
            column.MinX = offset_x; column.MaxX = offset_x; column.WorkMinX = offset_x
            column.ClipRect.Min.x = offset_x; column.ClipRect.Max.x = offset_x
            column.WidthGiven = 0.0
            column.ClipRect.Min.y = work_rect.Min.y
            column.ClipRect.Max.y = FLT_MAX
            column.ClipRect:ClipWithFull(host_clip_rect)
            column.IsVisibleX = false; column.IsVisibleY = false; column.IsRequestOutput = false
            column.IsSkipItems = true
            column.ItemWidth = 1.0
        else
            -- Lock start position
            column.MinX = offset_x

            -- Lock width based on start position and minimum/maximum width for this position
            column.WidthMax = ImGui.TableCalcMaxColumnWidth(table_, column_n)
            column.WidthGiven = ImMin(column.WidthGiven, column.WidthMax)
            column.WidthGiven = ImMax(column.WidthGiven, ImMin(column.WidthRequest, table_.MinColumnWidth))
            column.MaxX = offset_x + column.WidthGiven + table_.CellSpacingX1 + table_.CellSpacingX2 + table_.CellPaddingX * 2.0

            -- Lock other positions
            local previous_instance_work_min_x = column.WorkMinX
            column.WorkMinX = column.MinX + table_.CellPaddingX + table_.CellSpacingX1
            column.WorkMaxX = column.MaxX - table_.CellPaddingX - table_.CellSpacingX2 -- Expected max
            column.ItemWidth = ImTrunc(column.WidthGiven * 0.65)
            column.ClipRect.Min.x = column.MinX
            column.ClipRect.Min.y = work_rect.Min.y
            column.ClipRect.Max.x = column.MaxX --column->WorkMaxX;
            column.ClipRect.Max.y = FLT_MAX
            column.ClipRect:ClipWithFull(host_clip_rect)

            -- Mark column as Clipped (not in sight)
            column.IsVisibleX = (column.ClipRect.Max.x > column.ClipRect.Min.x)
            column.IsVisibleY = true -- (column->ClipRect.Max.y > column->ClipRect.Min.y);
            local is_visible = column.IsVisibleX --&& column->IsVisibleY;
            if is_visible then
                BitArraySet(table_.VisibleMaskByIndex, column_n)
            end

            -- Mark column as requesting output from user. Note that fixed + non-resizable sets are auto-fitting at all times and therefore always request output.
            column.IsRequestOutput = is_visible or column.AutoFitQueue ~= 0 or column.CannotSkipItemsQueue ~= 0

            -- Mark column as SkipItems (ignoring all items/layout)
            column.IsSkipItems = not column.IsEnabled or table_.HostSkipItems
            if column.IsSkipItems then
                IM_ASSERT(not is_visible)
            end
            if column.IsRequestOutput and not column.IsSkipItems then
                has_at_least_one_column_requesting_output = true
            end

            -- Update status flags
            column.Flags = bor(column.Flags, ImGuiTableColumnFlags.IsEnabled)
            if is_visible then
                column.Flags = bor(column.Flags, ImGuiTableColumnFlags.IsVisible)
            end
            if column.SortOrder ~= -1 then
                column.Flags = bor(column.Flags, ImGuiTableColumnFlags.IsSorted)
            end

            -- Detect hovered column
            if is_hovering_table and mouse_skewed_x >= column.ClipRect.Min.x and mouse_skewed_x < column.ClipRect.Max.x then
                column.Flags = bor(column.Flags, ImGuiTableColumnFlags.IsHovered)
                table_.HoveredColumnBody = column_n
            end

            -- Reset content width variables
            if table_.InstanceCurrent == 0 then
                column.ContentMaxXFrozen = column.WorkMinX
                column.ContentMaxXUnfrozen = column.WorkMinX
                column.ContentMaxXHeadersUsed = column.WorkMinX
                column.ContentMaxXHeadersIdeal = column.WorkMinX
            else
                -- As we store an absolute value to make per-cell updates faster, we need to offset values used for width computation.
                local offset_from_previous_instance = column.WorkMinX - previous_instance_work_min_x
                column.ContentMaxXFrozen = column.ContentMaxXFrozen + offset_from_previous_instance
                column.ContentMaxXUnfrozen = column.ContentMaxXUnfrozen + offset_from_previous_instance
                column.ContentMaxXHeadersUsed = column.ContentMaxXHeadersUsed + offset_from_previous_instance
                column.ContentMaxXHeadersIdeal = column.ContentMaxXHeadersIdeal + offset_from_previous_instance
            end

            -- Don't decrement auto-fit counters until container window got a chance to submit its items
            if table_.HostSkipItems == false and table_.InstanceCurrent == 0 then
                column.AutoFitQueue = rshift(column.AutoFitQueue, 1)
                column.CannotSkipItemsQueue = rshift(column.CannotSkipItemsQueue, 1)
            end

            if order_n < table_.FreezeColumnsCount then
                host_clip_rect.Min.x = ImClamp(column.MaxX + TABLE_BORDER_SIZE, host_clip_rect.Min.x, host_clip_rect.Max.x)
            end

            offset_x = offset_x + column.WidthGiven + table_.CellSpacingX1 + table_.CellSpacingX2 + table_.CellPaddingX * 2.0
        end
    end

    -- In case the table is visible (e.g. decorations) but all columns clipped, we keep a column visible.
    if has_at_least_one_column_requesting_output == false then
        table_.Columns[table_.LeftMostEnabledColumn].IsRequestOutput = true
        table_.Columns[table_.LeftMostEnabledColumn].IsSkipItems = false
    end

    -- [Part 7] Detect/store when we are hovering the unused space after the right-most column (so e.g. context menus can react on it)
    local unused_x1 = ImMax(table_.WorkRect.Min.x, table_.Columns[table_.RightMostEnabledColumn].ClipRect.Max.x)
    if is_hovering_table and table_.HoveredColumnBody == -1 then
        if mouse_skewed_x >= unused_x1 then
            table_.HoveredColumnBody = columns_count
        end
    end
    if has_resizable == false and band(table_.Flags, ImGuiTableFlags.Resizable) ~= 0 then
        table_.Flags = band(table_.Flags, bnot(ImGuiTableFlags.Resizable))
    end

    table_.IsActiveIdAliveBeforeTable = (g.ActiveIdIsAlive ~= 0)

    -- [Part 8] Lock actual OuterRect/WorkRect right-most position.
    if table_.RightMostStretchedColumn ~= -1 then
        table_.Flags = band(table_.Flags, bnot(ImGuiTableFlags.NoHostExtendX))
    end
    if band(table_.Flags, ImGuiTableFlags.NoHostExtendX) ~= 0 then
        table_.OuterRect.Max.x = unused_x1; table_.WorkRect.Max.x = unused_x1
        table_.InnerClipRect.Max.x = ImMin(table_.InnerClipRect.Max.x, unused_x1)
    end
    ImRect_Copy(table_.InnerWindow.ParentWorkRect, table_.WorkRect)
    table_.BorderX1 = table_.InnerClipRect.Min.x
    table_.BorderX2 = table_.InnerClipRect.Max.x

    -- Setup window's WorkRect.Max.y for GetContentRegionAvail(). Other values will be updated in each TableBeginCell() call.
    local window_content_max_y
    if band(table_.Flags, ImGuiTableFlags.NoHostExtendY) ~= 0 then
        window_content_max_y = table_.OuterRect.Max.y
    else
        window_content_max_y = ImMax(table_.InnerWindow.ContentRegionRect.Max.y, (band(table_.Flags, ImGuiTableFlags.ScrollY) ~= 0) and 0.0 or table_.OuterRect.Max.y)
    end
    table_.InnerWindow.WorkRect.Max.y = ImClamp(window_content_max_y - g.Style.CellPadding.y, table_.InnerWindow.WorkRect.Min.y, table_.InnerWindow.WorkRect.Max.y)

    -- [Part 9] Allocate draw channels and setup background cliprect
    ImGui.TableSetupDrawChannels(table_)

    -- [Part 10] Hit testing on borders
    if band(table_.Flags, ImGuiTableFlags.Resizable) ~= 0 then
        ImGui.TableUpdateBorders(table_)
    end
    table_instance.LastTopHeadersRowHeight = 0.0
    table_.IsLayoutLocked = true
    table_.IsUsingHeaders = false

    -- Highlight header
    table_.HighlightColumnHeader = -1
    if table_.IsContextPopupOpen and table_.ContextPopupColumn ~= -1 and table_.InstanceInteracted == table_.InstanceCurrent then
        table_.HighlightColumnHeader = table_.ContextPopupColumn
    elseif band(table_.Flags, ImGuiTableFlags.HighlightHoveredColumn) ~= 0 and table_.HoveredColumnBody ~= -1 and table_.HoveredColumnBody ~= columns_count and table_.HoveredColumnBorder == -1 then
        if g.ActiveId == 0 or (table_.IsActiveIdInTable or g.DragDropActive) then
            table_.HighlightColumnHeader = table_.HoveredColumnBody
        end
    end

    -- [Part 11] Default context menu
    if table_.DisableDefaultContextMenu == false and ImGui.TableBeginContextMenuPopup(table_) then
        ImGui.TableDrawDefaultContextMenu(table_, table_.Flags)
        ImGui.EndPopup()
    end

    -- [Part 12] Sanitize and build sort specs before we have a chance to use them for display.
    if table_.IsSortSpecsDirty and band(table_.Flags, ImGuiTableFlags.Sortable) ~= 0 then
        ImGui.TableSortSpecsBuild(table_)
    end

    -- [Part 13] Setup inner window decoration size (for scrolling / nav tracking to properly take account of frozen rows/columns)
    if table_.FreezeColumnsRequest > 0 then
        table_.InnerWindow.DecoInnerSizeX1 = table_.Columns[table_.DisplayOrderToIndex[table_.FreezeColumnsRequest - 1]].MaxX - table_.OuterRect.Min.x -- FIXME-FROZEN
    end
    if table_.FreezeRowsRequest > 0 then
        table_.InnerWindow.DecoInnerSizeY1 = table_instance.LastFrozenHeight
    end
    table_instance.LastFrozenHeight = 0.0

    local inner_window = table_.InnerWindow
    local bs = g.BoxSelectState
    if bs and bs.Window == inner_window and bs.UnclipMode then
        ImGui.TableApplyExternalUnclipRect(table_, bs.UnclipRect)
    end

    -- Initial state
    if band(table_.Flags, ImGuiTableFlags.NoClip) ~= 0 then
        table_.DrawSplitter:SetCurrentChannel(inner_window.DrawList, TABLE_DRAW_CHANNEL_NOCLIP)
    else
        inner_window.DrawList:PushClipRect(inner_window.InnerClipRect.Min, inner_window.InnerClipRect.Max, false) -- FIXME: use table->InnerClipRect?
    end
end

-- When starting a BeginMultiSelect() after table has been layout we update IsRequestOutput fields.
function ImGui.TableApplyExternalUnclipRect(table_, rect)
    if rect:IsInverted() then
        return
    end
    for column_n = 0, table_.ColumnsCount - 1 do
        local column = table_.Columns[column_n]
        if not column.IsRequestOutput then
            if rect:Overlaps(ImRect(column.MinX, table_.WorkRect.Min.y, column.MaxX, FLT_MAX)) then
                column.IsRequestOutput = true
            end
        end
    end
end

-- Process hit-testing on resizing borders. Actual size change will be applied in EndTable()
function ImGui.TableUpdateBorders(table_)
    local g = GImGui
    IM_ASSERT(band(table_.Flags, ImGuiTableFlags.Resizable) ~= 0)

    local table_instance = ImGui.TableGetInstanceData(table_, table_.InstanceCurrent)
    local hit_half_width = ImTrunc(TABLE_RESIZE_SEPARATOR_HALF_THICKNESS * g.CurrentDpiScale)
    local hit_y1 = ((table_.FreezeRowsCount >= 1) and table_.OuterRect.Min.y or table_.WorkRect.Min.y) + table_.AngledHeadersHeight
    local hit_y2_body = ImMax(table_.OuterRect.Max.y, hit_y1 + table_instance.LastOuterHeight - table_.AngledHeadersHeight)
    local hit_y2_head = hit_y1 + table_instance.LastTopHeadersRowHeight

    for order_n = 0, table_.ColumnsCount - 1 do
        repeat
            if not BitTest(table_.EnabledMaskByDisplayOrder, order_n) then
                break
            end

            local column_n = table_.DisplayOrderToIndex[order_n]
            local column = table_.Columns[column_n]
            if band(column.Flags, bor(ImGuiTableColumnFlags.NoResize, ImGuiTableColumnFlags.NoDirectResize_)) ~= 0 then
                break
            end

            -- ImGuiTableFlags_NoBordersInBodyUntilResize will be honored in TableDrawBorders()
            local border_y2_hit = (band(table_.Flags, ImGuiTableFlags.NoBordersInBody) ~= 0) and hit_y2_head or hit_y2_body
            if band(table_.Flags, ImGuiTableFlags.NoBordersInBody) ~= 0 and table_.IsUsingHeaders == false then
                break
            end

            if not column.IsVisibleX and table_.LastResizedColumn ~= column_n then
                break
            end

            local column_id = ImGui.TableGetColumnResizeID(table_, column_n, table_.InstanceCurrent)
            local hit_rect = ImRect(column.MaxX - hit_half_width, hit_y1, column.MaxX + hit_half_width, border_y2_hit)
            ImGui.ItemAdd(hit_rect, column_id, nil, ImGuiItemFlags.NoNav)

            local pressed, hovered, held = ImGui.ButtonBehavior(hit_rect, column_id, bor(ImGuiButtonFlags.FlattenChildren, ImGuiButtonFlags.PressedOnClick, ImGuiButtonFlags.PressedOnDoubleClick, ImGuiButtonFlags.NoNavFocus))
            if pressed and ImGui.IsMouseDoubleClicked(0) then
                ImGui.TableSetColumnWidthAutoSingle(table_, column_n)
                ImGui.ClearActiveID()
                held = false
            end
            if held then
                if table_.LastResizedColumn == -1 then
                    table_.ResizeLockMinContentsX2 = (table_.RightMostEnabledColumn ~= -1) and table_.Columns[table_.RightMostEnabledColumn].MaxX or -FLT_MAX
                end
                table_.ResizedColumn = column_n
                table_.InstanceInteracted = table_.InstanceCurrent
            end
            if (hovered and g.HoveredIdTimer > TABLE_RESIZE_SEPARATOR_FEEDBACK_TIMER) or held then
                table_.HoveredColumnBorder = column_n
                ImGui.SetMouseCursor(ImGuiMouseCursor.ResizeEW)
            end
        until true
    end
end

function ImGui.EndTable()
    local g = GImGui
    local table_ = g.CurrentTable
    IM_ASSERT_USER_ERROR_RET(table_ ~= nil, "EndTable() call should only be done while in BeginTable() scope!")

    -- If the user never got to call TableNextRow() or TableNextColumn(), we call layout ourselves.
    if not table_.IsLayoutLocked then
        ImGui.TableUpdateLayout(table_)
    end

    local flags = table_.Flags
    local inner_window = table_.InnerWindow
    local outer_window = table_.OuterWindow
    local temp_data = table_.TempData
    IM_ASSERT(inner_window == g.CurrentWindow and inner_window.ID == temp_data.WindowID)
    IM_ASSERT(outer_window == inner_window or outer_window == inner_window.ParentWindow)

    if table_.IsInsideRow then
        ImGui.TableEndRow(table_)
    end

    -- Context menu in columns body
    if band(flags, ImGuiTableFlags.ContextMenuInBody) ~= 0 then
        if table_.HoveredColumnBody ~= -1 and not ImGui.IsAnyItemHovered() and ImGui.IsMouseReleased(ImGuiMouseButton.Right) then
            ImGui.TableOpenContextMenu(table_.HoveredColumnBody)
        end
    end

    -- Finalize table height
    local table_instance = ImGui.TableGetInstanceData(table_, table_.InstanceCurrent)
    ImVec2_Copy(inner_window.DC.PrevLineSize, temp_data.HostBackupPrevLineSize)
    ImVec2_Copy(inner_window.DC.CurrLineSize, temp_data.HostBackupCurrLineSize)
    ImVec2_Copy(inner_window.DC.CursorMaxPos, temp_data.HostBackupCursorMaxPos)
    local inner_content_max_y = ImCeil(table_.RowPosY2) -- Rounding final position is important as we currently don't round row height
    IM_ASSERT(table_.RowPosY2 == inner_window.DC.CursorPos.y)
    if inner_window ~= outer_window then
        inner_window.DC.CursorMaxPos.y = inner_content_max_y
    elseif band(flags, ImGuiTableFlags.NoHostExtendY) == 0 then
        local v = ImMax(table_.OuterRect.Max.y, inner_content_max_y) -- Patch OuterRect/InnerRect height
        table_.OuterRect.Max.y = v; table_.InnerRect.Max.y = v
    end
    table_.WorkRect.Max.y = ImMax(table_.WorkRect.Max.y, table_.OuterRect.Max.y)
    table_instance.LastOuterHeight = table_.OuterRect:GetHeight()

    -- Setup inner scrolling range
    if band(table_.Flags, ImGuiTableFlags.ScrollX) ~= 0 then
        local outer_padding_for_border = (band(table_.Flags, ImGuiTableFlags.BordersOuterV) ~= 0) and TABLE_BORDER_SIZE or 0.0
        local max_pos_x = inner_window.DC.CursorMaxPos.x
        if table_.RightMostEnabledColumn ~= -1 then
            max_pos_x = ImMax(max_pos_x, table_.Columns[table_.RightMostEnabledColumn].WorkMaxX + table_.CellPaddingX + table_.OuterPaddingX - outer_padding_for_border)
        end
        if table_.ResizedColumn ~= -1 then
            max_pos_x = ImMax(max_pos_x, table_.ResizeLockMinContentsX2)
        end
        inner_window.DC.CursorMaxPos.x = max_pos_x + table_.TempData.AngledHeadersExtraWidth
    end

    -- Pop clipping rect
    if band(flags, ImGuiTableFlags.NoClip) == 0 then
        inner_window.DrawList:PopClipRect()
    end
    ImRect_CopyFromV4(inner_window.ClipRect, inner_window.DrawList._ClipRectStack:back())

    -- Draw borders
    if band(flags, ImGuiTableFlags.Borders) ~= 0 then
        ImGui.TableDrawBorders(table_)
    end

    -- Flatten channels and merge draw calls
    local splitter = table_.DrawSplitter
    splitter:SetCurrentChannel(inner_window.DrawList, 0)
    if band(table_.Flags, ImGuiTableFlags.NoClip) == 0 then
        ImGui.TableMergeDrawChannels(table_)
    end
    splitter:Merge(inner_window.DrawList)

    -- Update ColumnsAutoFitWidth to get us ahead for host using our size to auto-resize without waiting for next BeginTable()
    local auto_fit_width_for_fixed = 0.0
    local auto_fit_width_for_stretched = 0.0
    local auto_fit_width_for_stretched_min = 0.0
    for column_n = 0, table_.ColumnsCount - 1 do
        if BitTest(table_.EnabledMaskByIndex, column_n) then
            local column = table_.Columns[column_n]
            local column_width_request
            if band(column.Flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 and band(column.Flags, ImGuiTableColumnFlags.NoResize) == 0 then
                column_width_request = column.WidthRequest
            else
                column_width_request = ImGui.TableGetColumnWidthAuto(table_, column)
            end
            if band(column.Flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 then
                auto_fit_width_for_fixed = auto_fit_width_for_fixed + column_width_request
            else
                auto_fit_width_for_stretched = auto_fit_width_for_stretched + column_width_request
            end
            if band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0 and band(column.Flags, ImGuiTableColumnFlags.NoResize) ~= 0 then
                auto_fit_width_for_stretched_min = ImMax(auto_fit_width_for_stretched_min, column_width_request / (column.StretchWeight / table_.ColumnsStretchSumWeights))
            end
        end
    end
    local width_spacings = (table_.OuterPaddingX * 2.0) + (table_.CellSpacingX1 + table_.CellSpacingX2) * (table_.ColumnsEnabledCount - 1)
    table_.ColumnsAutoFitWidth = width_spacings + (table_.CellPaddingX * 2.0) * table_.ColumnsEnabledCount + auto_fit_width_for_fixed + ImMax(auto_fit_width_for_stretched, auto_fit_width_for_stretched_min)

    -- Update scroll
    if band(table_.Flags, ImGuiTableFlags.ScrollX) == 0 and inner_window ~= outer_window then
        inner_window.Scroll.x = 0.0
    elseif table_.LastResizedColumn ~= -1 and table_.ResizedColumn == -1 and inner_window.ScrollbarX and table_.InstanceInteracted == table_.InstanceCurrent then
        -- When releasing a column being resized, scroll to keep the resulting column in sight
        local neighbor_width_to_keep_visible = table_.MinColumnWidth + table_.CellPaddingX * 2.0
        local column = table_.Columns[table_.LastResizedColumn]
        if column.MaxX < table_.InnerClipRect.Min.x then
            ImGui.SetScrollFromPosX(inner_window, column.MaxX - inner_window.Pos.x - neighbor_width_to_keep_visible, 1.0)
        elseif column.MaxX > table_.InnerClipRect.Max.x then
            ImGui.SetScrollFromPosX(inner_window, column.MaxX - inner_window.Pos.x + neighbor_width_to_keep_visible, 1.0)
        end
    end

    -- Apply resizing/dragging at the end of the frame
    if table_.ResizedColumn ~= -1 and table_.InstanceCurrent == table_.InstanceInteracted then
        local column = table_.Columns[table_.ResizedColumn]
        local new_x2 = (g.IO.MousePos.x - g.ActiveIdClickOffset.x + ImTrunc(TABLE_RESIZE_SEPARATOR_HALF_THICKNESS * g.CurrentDpiScale))
        local new_width = ImTrunc(new_x2 - column.MinX - table_.CellSpacingX1 - table_.CellPaddingX * 2.0)
        table_.ResizedColumnNextWidth = new_width
    end

    table_.IsActiveIdInTable = (g.ActiveIdIsAlive ~= 0 and table_.IsActiveIdAliveBeforeTable == false)

    -- Pop from id stack
    IM_ASSERT_USER_ERROR(inner_window.IDStack:back() == table_instance.TableInstanceID, "Mismatching PushID/PopID!")
    IM_ASSERT_USER_ERROR(outer_window.DC.ItemWidthStack.Size >= temp_data.HostBackupItemWidthStackSize, "Too many PopItemWidth!")
    if table_.InstanceCurrent > 0 then
        ImGui.PopID()
    end
    ImGui.PopID()

    -- Restore window data that we modified
    local backup_outer_max_pos = V2(outer_window.DC.CursorMaxPos)
    ImRect_Copy(inner_window.WorkRect, temp_data.HostBackupWorkRect)
    ImRect_Copy(inner_window.ParentWorkRect, temp_data.HostBackupParentWorkRect)
    inner_window.SkipItems = table_.HostSkipItems
    ImVec2_Copy(outer_window.DC.CursorPos, table_.OuterRect.Min)
    outer_window.DC.ItemWidth = temp_data.HostBackupItemWidth
    outer_window.DC.ItemWidthStack:resize(temp_data.HostBackupItemWidthStackSize)
    outer_window.DC.ColumnsOffset.x = temp_data.HostBackupColumnsOffset

    -- Layout in outer window
    if inner_window ~= outer_window then
        local backup_nav_layers_active_mask = inner_window.DC.NavLayersActiveMask
        inner_window.DC.NavLayersActiveMask = bor(inner_window.DC.NavLayersActiveMask, lshift(1, table_.NavLayer)) -- So empty table don't appear to navigate differently.
        g.CurrentTable = nil -- To avoid error recovery recursing
        ImGui.EndChild()
        g.CurrentTable = table_
        inner_window.DC.NavLayersActiveMask = backup_nav_layers_active_mask
    else
        inner_window.DC.TreeDepth = inner_window.DC.TreeDepth - 1
        ImGui.ItemSize(table_.OuterRect:GetSize())
        ImGui.ItemAdd(table_.OuterRect, 0)
    end

    -- Override declared contents width/height to enable auto-resize while not needlessly adding a scrollbar
    if band(table_.Flags, ImGuiTableFlags.NoHostExtendX) ~= 0 then
        IM_ASSERT(band(table_.Flags, ImGuiTableFlags.ScrollX) == 0)
        outer_window.DC.CursorMaxPos.x = ImMax(backup_outer_max_pos.x, table_.OuterRect.Min.x + table_.ColumnsAutoFitWidth)
    elseif temp_data.UserOuterSize.x <= 0.0 then
        local outer_content_max_x = table_.OuterRect.Min.x + table_.ColumnsAutoFitWidth
        local decoration_size = table_.TempData.AngledHeadersExtraWidth + ((inner_window ~= outer_window) and inner_window.ScrollbarSizes.x or 0.0)
        outer_window.DC.IdealMaxPos.x = ImMax(outer_window.DC.IdealMaxPos.x, outer_content_max_x + decoration_size - temp_data.UserOuterSize.x)
        outer_window.DC.CursorMaxPos.x = ImMax(backup_outer_max_pos.x, ImMin(table_.OuterRect.Max.x, outer_content_max_x + decoration_size))
    else
        outer_window.DC.CursorMaxPos.x = ImMax(backup_outer_max_pos.x, table_.OuterRect.Max.x)
    end
    if temp_data.UserOuterSize.y <= 0.0 then
        local outer_content_size_y = (inner_window == outer_window) and (inner_content_max_y - table_.InnerRect.Min.y) or (inner_content_max_y - inner_window.DC.CursorStartPos.y)
        local outer_content_max_y = table_.OuterRect.Min.y + outer_content_size_y
        local decoration_size = (inner_window ~= outer_window) and inner_window.ScrollbarSizes.y or 0.0
        outer_window.DC.IdealMaxPos.y = ImMax(outer_window.DC.IdealMaxPos.y, outer_content_max_y + decoration_size - temp_data.UserOuterSize.y)
        outer_window.DC.CursorMaxPos.y = ImMax(backup_outer_max_pos.y, ImMin(table_.OuterRect.Max.y, outer_content_max_y + decoration_size))
    else
        -- OuterRect.Max.y may already have been pushed downward from the initial value (unless ImGuiTableFlags_NoHostExtendY is set)
        outer_window.DC.CursorMaxPos.y = ImMax(backup_outer_max_pos.y, table_.OuterRect.Max.y)
    end

    -- Save settings
    if table_.IsSettingsDirty then
        ImGui.TableSaveSettings(table_)
    end
    table_.IsInitializing = false

    -- Clear or restore current table, if any
    IM_ASSERT(g.CurrentWindow == outer_window and g.CurrentTable == table_)
    IM_ASSERT(g.TablesTempDataStacked > 0)
    g.TablesTempDataStacked = g.TablesTempDataStacked - 1
    temp_data = (g.TablesTempDataStacked > 0) and g.TablesTempData.Data[g.TablesTempDataStacked] or nil
    g.CurrentTable = (temp_data and (temp_data.WindowID == outer_window.ID)) and g.Tables:GetByIndex(temp_data.TableIndex) or nil
    if g.CurrentTable then
        g.CurrentTable.TempData = temp_data
        g.CurrentTable.DrawSplitter = temp_data.DrawSplitter
    end
    outer_window.DC.CurrentTableIdx = g.CurrentTable and g.Tables:GetIndex(g.CurrentTable) or -1
    ImGui.NavUpdateCurrentWindowIsScrollPushableX()
end

-- Called in TableUpdateLayout() when initializing/after loading settings.
-- 'init_mask' specify which fields to initialize.
--- @param column_n int # index of `column` (C++: Columns.index_from_ptr(column))
function ImGui.TableInitColumnDefaults(table_, column, column_n, init_mask)
    local flags = column.Flags
    if band(init_mask, ImGuiTableFlags.Resizable) ~= 0 then
        local init_width_or_weight = column.InitStretchWeightOrWidth
        column.WidthRequest = (band(flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 and init_width_or_weight > 0.0) and init_width_or_weight or -1.0
        column.StretchWeight = (init_width_or_weight > 0.0 and band(flags, ImGuiTableColumnFlags.WidthStretch) ~= 0) and init_width_or_weight or -1.0
        if init_width_or_weight > 0.0 then -- Disable auto-fit if an explicit width/weight has been specified
            column.AutoFitQueue = 0x00
        end
    end
    if band(init_mask, ImGuiTableFlags.Reorderable) ~= 0 then
        column.DisplayOrder = (band(table_.Flags, ImGuiTableFlags.Reorderable) ~= 0) and -1 or column_n
    end
    if band(init_mask, ImGuiTableFlags.Hideable) ~= 0 then
        local v = band(flags, ImGuiTableColumnFlags.DefaultHide) == 0
        column.IsUserEnabled = v; column.IsUserEnabledNextFrame = v
    end
    if band(init_mask, ImGuiTableFlags.Sortable) ~= 0 then
        -- Multiple columns using _DefaultSort will be reassigned unique SortOrder values when building the sort specs.
        column.SortOrder = (band(flags, ImGuiTableColumnFlags.DefaultSort) ~= 0) and 0 or -1
        if band(flags, ImGuiTableColumnFlags.DefaultSort) ~= 0 then
            column.SortDirection = (band(flags, ImGuiTableColumnFlags.PreferSortDescending) ~= 0) and ImGuiSortDirection.Descending or ImGuiSortDirection.Ascending
        else
            column.SortDirection = ImGuiSortDirection.None
        end
    end
end

-- See "COLUMNS SIZING POLICIES" comments at the top of this file
-- If (init_width_or_weight <= 0.0f) it is ignored
local function TableSetupColumnApply(table_, idx, id, name_offset, flags, init_width_or_weight, user_data)
    local column = table_.Columns[idx]

    -- Assert when passing a width or weight if policy is entirely left to default, to avoid storing width into weight and vice-versa.
    if table_.IsDefaultSizingPolicy and band(flags, ImGuiTableColumnFlags.WidthMask_) == 0 and band(flags, ImGuiTableFlags.ScrollX) == 0 then
        IM_ASSERT_USER_ERROR_RET(init_width_or_weight <= 0.0, "TableSetupColumn(): can only specify width/weight if sizing policy is set explicitly in either Table or Column.")
    end

    -- When passing a width automatically enforce WidthFixed policy
    if band(flags, ImGuiTableColumnFlags.WidthMask_) == 0 and init_width_or_weight > 0.0 then
        if band(table_.Flags, ImGuiTableFlags.SizingMask_) == ImGuiTableFlags.SizingFixedFit or band(table_.Flags, ImGuiTableFlags.SizingMask_) == ImGuiTableFlags.SizingFixedSame then
            flags = bor(flags, ImGuiTableColumnFlags.WidthFixed)
        end
    end
    if band(flags, ImGuiTableColumnFlags.AngledHeader) ~= 0 then
        flags = bor(flags, ImGuiTableColumnFlags.NoHeaderLabel)
        table_.AngledHeadersCount = table_.AngledHeadersCount + 1
    end

    TableSetupColumnFlags(table_, column, idx, flags)
    column.ID = id
    column.UserData = user_data
    column.NameOffset = name_offset
    column.InitStretchWeightOrWidth = init_width_or_weight
end

--- @param label                 string?
--- @param flags?                ImGuiTableColumnFlags
--- @param init_width_or_weight? float
--- @param user_data?            ImGuiID
function ImGui.TableSetupColumn(label, flags, init_width_or_weight, user_data)
    if flags == nil then flags = 0 end
    if init_width_or_weight == nil then init_width_or_weight = 0.0 end
    if user_data == nil then user_data = 0 end

    local g = GImGui
    local table_ = g.CurrentTable
    IM_ASSERT_USER_ERROR_RET(table_ ~= nil, "Call should only be done while in BeginTable() scope!")
    IM_ASSERT_USER_ERROR_RET(table_.DeclColumnsCount < table_.ColumnsCount, "TableSetupColumn(): called too many times!")
    IM_ASSERT_USER_ERROR_RET(table_.IsLayoutLocked == false, "TableSetupColumn(): need to call before first row!")
    IM_ASSERT(band(flags, ImGuiTableColumnFlags.StatusMask_) == 0, "Illegal to pass StatusMask values to TableSetupColumn()")

    -- Store name
    local name_offset = -1
    if label ~= nil and label ~= "" then
        name_offset = #table_.ColumnsNames
        table_.ColumnsNames[name_offset + 1] = label
    end
    local column_id = (label ~= nil and label ~= "") and ImHashStr(label) or 0

    -- When ID changed or a column moved: defer the request until layout where we will process full reconcile.
    local column_idx = table_.DeclColumnsCount
    table_.DeclColumnsCount = table_.DeclColumnsCount + 1
    local column = table_.Columns[column_idx]

    -- If topology change goes into reconcile mode
    if table_.IsReconcileMode == false and column.ID ~= column_id and not table_.IsNewTable then
        table_.IsReconcileMode = true
    end

    -- Fast/common path
    if table_.IsReconcileMode == false then
        TableSetupColumnApply(table_, column_idx, column_id, name_offset, flags, init_width_or_weight, user_data)
        column.IsNeedReconcileSrc = false; column.IsNeedReconcileDst = false
        local old = table_.TempData.OldColumnsData
        if old and column_idx < table_.TempData.OldColumnsDataSize then
            old[column_idx].IsNeedReconcileSrc = false
        end
        return
    end

    -- Reconcile path: defer applying data to TableUpdateLayout() -> TableReconcileMovedColumns() -> TableSetupColumnApply().
    local reconcile_data = {
        ID = column_id, NameOffset = name_offset, Flags = flags, InitWidthOrWeight = init_width_or_weight, UserData = user_data,
        ColumnNewIdx = column_idx, ColumnOldIdx = -1, ColumnOldData = ImGuiTableColumn(),
    }
    table_.TempData.ReconcileColumnsRequests:push_back(reconcile_data)
    column.NameOffset = name_offset -- Allow TableGetColumnName() to work before layout
    column.IsNeedReconcileSrc = true; column.IsNeedReconcileDst = true
end

-- NB: This was written to be similar to the logic in TableLoadSettingsForColumns().
function ImGui.TableReconcileColumns(table_)
    local temp_data = table_.TempData
    IMGUI_DEBUG_LOG_TABLE("[table] Reconcile columns for table 0x%08X\n", table_.ID)

    local dst_columns = table_.Columns
    local src_columns, src_count
    if temp_data.OldColumnsData == nil then
        src_columns, src_count = table_.Columns, table_.ColumnsSize
    else
        src_columns, src_count = temp_data.OldColumnsData, temp_data.OldColumnsDataSize
    end

    -- Find matches for named columns.
    local matches = 0
    local reconcile_requests = temp_data.ReconcileColumnsRequests
    for _, reconcile_data in reconcile_requests:iter() do
        if reconcile_data.ID ~= 0 then
            for src_n = 0, src_count - 1 do
                local src_column = src_columns[src_n]
                if src_column.ID == reconcile_data.ID and src_column.IsNeedReconcileSrc then
                    local dst_column = dst_columns[reconcile_data.ColumnNewIdx]
                    IM_ASSERT(src_column.IsNeedReconcileSrc and dst_column.IsNeedReconcileDst)
                    src_column.IsNeedReconcileSrc = false; dst_column.IsNeedReconcileDst = false
                    reconcile_data.ColumnOldIdx = src_n
                    reconcile_data.ColumnOldData = TableColumnClone(src_column)
                    matches = matches + 1
                    break
                end
            end
        end
    end

    -- Remaining entries are matched sequentially.
    local dst_idx = 1 -- index in reconcile array (1-based)
    if matches ~= reconcile_requests.Size then
        for src_n = 0, src_count - 1 do
            local src_column = src_columns[src_n]
            if src_column.IsNeedReconcileSrc then
                while dst_idx <= reconcile_requests.Size and reconcile_requests.Data[dst_idx].ColumnOldIdx ~= -1 do
                    dst_idx = dst_idx + 1
                end
                if dst_idx > reconcile_requests.Size then
                    break
                end
                local reconcile_data = reconcile_requests.Data[dst_idx]
                local dst_column = dst_columns[reconcile_data.ColumnNewIdx]
                IM_ASSERT(src_column.IsNeedReconcileSrc and dst_column.IsNeedReconcileDst)
                src_column.IsNeedReconcileSrc = false; dst_column.IsNeedReconcileDst = false
                reconcile_data.ColumnOldIdx = src_n
                reconcile_data.ColumnOldData = TableColumnClone(src_column)
            end
        end
    end

    -- Apply in the final pass. Because it is possible that src_columns == table->Columns we went through a temporary copy.
    for _, reconcile_data in reconcile_requests:iter() do
        TableColumnCopy(table_.Columns[reconcile_data.ColumnNewIdx], reconcile_data.ColumnOldData)
        TableSetupColumnApply(table_, reconcile_data.ColumnNewIdx, reconcile_data.ID, reconcile_data.NameOffset, reconcile_data.Flags, reconcile_data.InitWidthOrWeight, reconcile_data.UserData)
    end
    ImGui.TableFixDisplayOrder(table_)
    table_.IsSettingsDirty = true -- FIXME-RECONCILE: Necessary?
    table_.IsReconcileMode = false
    reconcile_requests:resize(0) -- GC-ed once in NewFrame()
end

-- [Public]
function ImGui.TableSetupScrollFreeze(columns, rows)
    local g = GImGui
    local table_ = g.CurrentTable
    IM_ASSERT_USER_ERROR_RET(table_ ~= nil, "Call should only be done while in BeginTable() scope!")
    IM_ASSERT(table_.IsLayoutLocked == false, "TableSetupColumn(): need to call before first row!")
    IM_ASSERT(columns >= 0 and columns < IMGUI_TABLE_MAX_COLUMNS)
    IM_ASSERT(rows >= 0 and rows < 128) -- Arbitrary limit

    table_.FreezeColumnsRequest = (band(table_.Flags, ImGuiTableFlags.ScrollX) ~= 0) and ImMin(columns, table_.ColumnsCount) or 0
    table_.FreezeColumnsCount = (table_.InnerWindow.Scroll.x ~= 0.0) and table_.FreezeColumnsRequest or 0
    table_.FreezeRowsRequest = (band(table_.Flags, ImGuiTableFlags.ScrollY) ~= 0) and rows or 0
    table_.FreezeRowsCount = (table_.InnerWindow.Scroll.y ~= 0.0) and table_.FreezeRowsRequest or 0
    table_.IsUnfrozenRows = (table_.FreezeRowsCount == 0) -- Make sure this is set before TableUpdateLayout() so ImGuiListClipper can benefit from it.
end

----------------------------------------------------------------
-- [SECTION] Tables: Simple accessors
----------------------------------------------------------------

function ImGui.SetWindowClipRectBeforeSetChannel(window, clip_rect)
    local clip_rect_vec4 = clip_rect:ToVec4()
    ImRect_Copy(window.ClipRect, clip_rect)
    ImVec4_Copy(window.DrawList._CmdHeader.ClipRect, clip_rect_vec4)
    window.DrawList._ClipRectStack.Data[window.DrawList._ClipRectStack.Size] = clip_rect_vec4
end

function ImGui.TableGetColumnCount()
    local g = GImGui
    local table_ = g.CurrentTable
    return table_ and table_.ColumnsCount or 0
end

-- Overloads: TableGetColumnName(column_n?) / TableGetColumnName(table, column_n)
function ImGui.TableGetColumnName(a, b)
    local table_, column_n
    if type(a) == "table" then
        table_, column_n = a, b
    else
        local g = GImGui
        table_ = g.CurrentTable
        if not table_ then
            return nil
        end
        column_n = a or -1
        if column_n < 0 then
            column_n = table_.CurrentColumn
        end
    end
    if table_.IsLayoutLocked == false and column_n >= table_.DeclColumnsCount then
        return "" -- NameOffset is invalid at this point
    end
    local column = table_.Columns[column_n]
    if column.NameOffset == -1 then
        return ""
    end
    return table_.ColumnsNames[column.NameOffset + 1]
end

-- Change user accessible enabled/disabled state of a column (often perceived as "showing/hiding" from users point of view)
function ImGui.TableSetColumnEnabled(column_n, enabled)
    local g = GImGui
    local table_ = g.CurrentTable
    IM_ASSERT_USER_ERROR_RET(table_ ~= nil, "Call should only be done while in BeginTable() scope!")
    IM_ASSERT(band(table_.Flags, ImGuiTableFlags.Hideable) ~= 0) -- See comments above
    if column_n < 0 then
        column_n = table_.CurrentColumn
    end
    IM_ASSERT(column_n >= 0 and column_n < table_.ColumnsCount)
    local column = table_.Columns[column_n]
    column.IsUserEnabledNextFrame = enabled
end

-- We allow querying for an extra column in order to poll the IsHovered state of the right-most section
function ImGui.TableGetColumnFlags(column_n)
    if column_n == nil then column_n = -1 end
    local g = GImGui
    local table_ = g.CurrentTable
    if not table_ then
        return ImGuiTableColumnFlags.None
    end
    if column_n < 0 then
        column_n = table_.CurrentColumn
    end
    if column_n == table_.ColumnsCount then
        return (table_.HoveredColumnBody == column_n) and ImGuiTableColumnFlags.IsHovered or ImGuiTableColumnFlags.None
    end
    return table_.Columns[column_n].Flags
end

-- Return the cell rectangle based on currently known height.
function ImGui.TableGetCellBgRect(table_, column_n)
    local column = table_.Columns[column_n]
    local x1 = column.MinX
    local x2 = column.MaxX
    x1 = ImMax(x1, table_.WorkRect.Min.x)
    x2 = ImMin(x2, table_.WorkRect.Max.x)
    return ImRect(x1, table_.RowPosY1, x2, table_.RowPosY2)
end

-- Return the resizing ID for the right-side of the given column.
function ImGui.TableGetColumnResizeID(table_, column_n, instance_no)
    if instance_no == nil then instance_no = 0 end
    IM_ASSERT(column_n >= 0 and column_n < table_.ColumnsCount)
    local instance_id = ImGui.TableGetInstanceID(table_, instance_no)
    return band(instance_id + 1 + column_n, 0xFFFFFFFF) -- FIXME: #6140: still not ideal
end

-- Return -1 when table is not hovered. return columns_count if hovering the unused space at the right of the right-most visible column.
function ImGui.TableGetHoveredColumn()
    local g = GImGui
    local table_ = g.CurrentTable
    if not table_ then
        return -1
    end
    return table_.HoveredColumnBody
end

-- Return -1 when table is not hovered. Return maxrow+1 if in table but below last submitted row.
function ImGui.TableGetHoveredRow()
    local g = GImGui
    local table_ = g.CurrentTable
    if not table_ then
        return -1
    end
    local table_instance = ImGui.TableGetInstanceData(table_, table_.InstanceCurrent)
    return table_instance.HoveredRowLast
end

function ImGui.TableSetBgColor(target, color, column_n)
    if column_n == nil then column_n = -1 end
    local g = GImGui
    local table_ = g.CurrentTable
    IM_ASSERT_USER_ERROR_RET(table_ ~= nil, "Call should only be done while in BeginTable() scope!")
    IM_ASSERT(target ~= ImGuiTableBgTarget.None)

    if color == IM_COL32_DISABLE then
        color = 0
    end

    -- We cannot draw neither the cell or row background immediately as we don't know the row height at this point in time.
    if target == ImGuiTableBgTarget.CellBg then
        if table_.RowPosY1 > table_.InnerClipRect.Max.y then -- Discard
            return
        end
        if column_n == -1 then
            column_n = table_.CurrentColumn
        end
        if not BitTest(table_.VisibleMaskByIndex, column_n) then
            return
        end
        if table_.RowCellDataCurrent < 0 or table_.RowCellData[table_.RowCellDataCurrent].Column ~= column_n then
            table_.RowCellDataCurrent = table_.RowCellDataCurrent + 1
        end
        local cell_data = table_.RowCellData[table_.RowCellDataCurrent]
        cell_data.BgColor = color
        cell_data.Column = column_n
    elseif target == ImGuiTableBgTarget.RowBg0 or target == ImGuiTableBgTarget.RowBg1 then
        if table_.RowPosY1 > table_.InnerClipRect.Max.y then -- Discard
            return
        end
        IM_ASSERT(column_n == -1)
        local bg_idx = (target == ImGuiTableBgTarget.RowBg1) and 1 or 0
        table_.RowBgColor[bg_idx] = color
    else
        IM_ASSERT(false)
    end
end

----------------------------------------------------------------
-- [SECTION] Tables: Row changes
----------------------------------------------------------------

-- [Public] Note: for row coloring we use ->RowBgColorCounter which is the same value without counting header rows
function ImGui.TableGetRowIndex()
    local g = GImGui
    local table_ = g.CurrentTable
    if not table_ then
        return 0
    end
    return table_.CurrentRow
end

-- [Public] Starts into the first cell of a new row
--- @param row_flags?      ImGuiTableRowFlags
--- @param row_min_height? float
function ImGui.TableNextRow(row_flags, row_min_height)
    if row_flags == nil then row_flags = 0 end
    if row_min_height == nil then row_min_height = 0.0 end

    local g = GImGui
    local table_ = g.CurrentTable

    if not table_.IsLayoutLocked then
        ImGui.TableUpdateLayout(table_)
    end
    if table_.IsInsideRow then
        ImGui.TableEndRow(table_)
    end

    table_.LastRowFlags = table_.RowFlags
    table_.RowFlags = row_flags
    table_.RowCellPaddingY = g.Style.CellPadding.y
    table_.RowMinHeight = row_min_height
    ImGui.TableBeginRow(table_)

    -- We honor min_row_height requested by user, but cannot guarantee per-row maximum height,
    -- because that would essentially require a unique clipping rectangle per-cell.
    table_.RowPosY2 = table_.RowPosY2 + table_.RowCellPaddingY * 2.0
    table_.RowPosY2 = ImMax(table_.RowPosY2, table_.RowPosY1 + row_min_height)

    -- Disable output until user calls TableNextColumn()
    table_.InnerWindow.SkipItems = true
end

-- [Internal] Only called by TableNextRow()
function ImGui.TableBeginRow(table_)
    local window = table_.InnerWindow
    IM_ASSERT(not table_.IsInsideRow)

    -- New row
    table_.CurrentRow = table_.CurrentRow + 1
    table_.CurrentColumn = -1
    table_.RowBgColor[0] = IM_COL32_DISABLE; table_.RowBgColor[1] = IM_COL32_DISABLE
    table_.RowCellDataCurrent = -1
    table_.IsInsideRow = true

    -- Begin frozen rows
    local next_y1 = table_.RowPosY2
    if table_.CurrentRow == 0 and table_.FreezeRowsCount > 0 then
        next_y1 = table_.OuterRect.Min.y
        window.DC.CursorPos.y = next_y1
    end

    table_.RowPosY1 = next_y1; table_.RowPosY2 = next_y1
    table_.RowTextBaseline = 0.0
    table_.RowIndentOffsetX = window.DC.Indent.x - table_.HostIndentX -- Lock indent

    window.DC.PrevLineTextBaseOffset = 0.0
    window.DC.CursorPosPrevLine.x = window.DC.CursorPos.x
    window.DC.CursorPosPrevLine.y = window.DC.CursorPos.y + table_.RowCellPaddingY -- This allows users to call SameLine() to share LineSize between columns.
    window.DC.PrevLineSize.x = 0.0; window.DC.PrevLineSize.y = 0.0
    window.DC.CurrLineSize.x = 0.0; window.DC.CurrLineSize.y = 0.0
    window.DC.IsSameLine = false; window.DC.IsSetPos = false
    window.DC.CursorMaxPos.y = next_y1

    -- Making the header BG color non-transparent will allow us to overlay it multiple times when handling smooth dragging.
    if band(table_.RowFlags, ImGuiTableRowFlags.Headers) ~= 0 then
        ImGui.TableSetBgColor(ImGuiTableBgTarget.RowBg0, ImGui.GetColorU32(ImGuiCol.TableHeaderBg))
        if table_.CurrentRow == 0 then
            table_.IsUsingHeaders = true
        end
    end
end

-- [Internal] Called by TableNextRow()
function ImGui.TableEndRow(table_)
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT(window == table_.InnerWindow)
    IM_ASSERT(table_.IsInsideRow)

    if table_.CurrentColumn ~= -1 then
        ImGui.TableEndCell(table_)
        table_.CurrentColumn = -1
    end

    -- Logging
    if g.LogEnabled then
        ImGui.LogRenderedText(nil, "|")
    end

    -- Position cursor at the bottom of our row so it can be used for e.g. clipping calculation.
    window.DC.CursorPos.y = table_.RowPosY2

    -- Row background fill
    local bg_y1 = table_.RowPosY1
    local bg_y2 = table_.RowPosY2
    local unfreeze_rows_actual = (table_.CurrentRow + 1 == table_.FreezeRowsCount)
    local unfreeze_rows_request = (table_.CurrentRow + 1 == table_.FreezeRowsRequest)
    local table_instance = ImGui.TableGetInstanceData(table_, table_.InstanceCurrent)
    if band(table_.RowFlags, ImGuiTableRowFlags.Headers) ~= 0 and (table_.CurrentRow == 0 or band(table_.LastRowFlags, ImGuiTableRowFlags.Headers) ~= 0) then
        table_instance.LastTopHeadersRowHeight = table_instance.LastTopHeadersRowHeight + bg_y2 - bg_y1
    end

    local is_visible = (bg_y2 >= table_.InnerClipRect.Min.y and bg_y1 <= table_.InnerClipRect.Max.y)
    if is_visible then
        -- Update data for TableGetHoveredRow()
        if table_.HoveredColumnBody ~= -1 and g.IO.MousePos.y >= bg_y1 and g.IO.MousePos.y < bg_y2 and table_instance.HoveredRowNext < 0 then
            table_instance.HoveredRowNext = table_.CurrentRow
        end

        -- Decide of background color for the row
        local bg_col0 = 0
        local bg_col1 = 0
        if table_.RowBgColor[0] ~= IM_COL32_DISABLE then
            bg_col0 = table_.RowBgColor[0]
        elseif band(table_.Flags, ImGuiTableFlags.RowBg) ~= 0 then
            bg_col0 = ImGui.GetColorU32((band(table_.RowBgColorCounter, 1) ~= 0) and ImGuiCol.TableRowBgAlt or ImGuiCol.TableRowBg)
        end
        if table_.RowBgColor[1] ~= IM_COL32_DISABLE then
            bg_col1 = table_.RowBgColor[1]
        end

        -- Decide of top border color
        local top_border_col = 0
        local border_size = TABLE_BORDER_SIZE
        if table_.CurrentRow > 0 and band(table_.Flags, ImGuiTableFlags.BordersInnerH) ~= 0 then
            top_border_col = (band(table_.LastRowFlags, ImGuiTableRowFlags.Headers) ~= 0) and table_.BorderColorStrong or table_.BorderColorLight
        end

        local draw_cell_bg_color = table_.RowCellDataCurrent >= 0
        local draw_strong_bottom_border = unfreeze_rows_actual
        if bor(bg_col0, bg_col1, top_border_col) ~= 0 or draw_strong_bottom_border or draw_cell_bg_color then
            -- In theory we could call SetWindowClipRectBeforeSetChannel() but since we know TableEndRow() is
            -- always followed by a change of clipping rectangle we perform the smallest overwrite possible here.
            if band(table_.Flags, ImGuiTableFlags.NoClip) == 0 then
                ImVec4_Copy(window.DrawList._CmdHeader.ClipRect, table_.Bg0ClipRectForDrawCmd:ToVec4())
            end
            table_.DrawSplitter:SetCurrentChannel(window.DrawList, TABLE_DRAW_CHANNEL_BG0)
        end

        -- Draw row background
        -- We soft/cpu clip this so all backgrounds and borders can share the same clipping rectangle
        if bg_col0 ~= 0 or bg_col1 ~= 0 then
            local row_rect = ImRect(table_.WorkRect.Min.x, bg_y1, table_.WorkRect.Max.x, bg_y2)
            row_rect:ClipWith(table_.BgClipRect)
            if bg_col0 ~= 0 and row_rect.Min.y < row_rect.Max.y then
                window.DrawList:AddRectFilled(row_rect.Min, row_rect.Max, bg_col0)
            end
            if bg_col1 ~= 0 and row_rect.Min.y < row_rect.Max.y then
                window.DrawList:AddRectFilled(row_rect.Min, row_rect.Max, bg_col1)
            end
        end

        -- Draw cell background color
        if draw_cell_bg_color then
            for cell_n = 0, table_.RowCellDataCurrent do
                local cell_data = table_.RowCellData[cell_n]
                -- As we render the BG here we need to clip things (for layout we would not)
                local column = table_.Columns[cell_data.Column]
                local cell_bg_rect = ImGui.TableGetCellBgRect(table_, cell_data.Column)
                cell_bg_rect:ClipWith(table_.BgClipRect)
                cell_bg_rect.Min.x = ImMax(cell_bg_rect.Min.x, column.ClipRect.Min.x) -- So that first column after frozen one gets clipped when scrolling
                cell_bg_rect.Max.x = ImMin(cell_bg_rect.Max.x, column.MaxX)
                if cell_bg_rect.Min.y < cell_bg_rect.Max.y then
                    window.DrawList:AddRectFilled(cell_bg_rect.Min, cell_bg_rect.Max, cell_data.BgColor)
                end
            end
        end

        -- Draw top border
        if top_border_col ~= 0 and bg_y1 >= table_.BgClipRect.Min.y and bg_y1 < table_.BgClipRect.Max.y then
            window.DrawList:AddLineH(table_.BorderX1, table_.BorderX2, bg_y1, top_border_col, border_size)
        end

        -- Draw bottom border at the row unfreezing mark (always strong)
        if draw_strong_bottom_border and bg_y2 >= table_.BgClipRect.Min.y and bg_y2 < table_.BgClipRect.Max.y then
            window.DrawList:AddLineH(table_.BorderX1, table_.BorderX2, bg_y2, table_.BorderColorStrong, border_size)
        end
    end

    -- End frozen rows (when we are past the last frozen row line, teleport cursor and alter clipping rectangle)
    if unfreeze_rows_request then
        IM_ASSERT(table_.FreezeRowsRequest > 0)
        for column_n = 0, table_.ColumnsCount - 1 do
            table_.Columns[column_n].NavLayerCurrent = table_.NavLayer
        end
        local y0 = ImMax(table_.RowPosY2 + 1, table_.InnerClipRect.Min.y)
        table_instance.LastFrozenHeight = y0 - table_.OuterRect.Min.y

        if unfreeze_rows_actual then
            IM_ASSERT(table_.IsUnfrozenRows == false)
            table_.IsUnfrozenRows = true

            -- BgClipRect starts as table->InnerClipRect, reduce it now and make BgClipRectForDrawCmd == BgClipRect
            local min_y = ImMin(y0, table_.InnerClipRect.Max.y)
            table_.BgClipRect.Min.y = min_y; table_.Bg2ClipRectForDrawCmd.Min.y = min_y
            table_.BgClipRect.Max.y = table_.InnerClipRect.Max.y; table_.Bg2ClipRectForDrawCmd.Max.y = table_.InnerClipRect.Max.y
            table_.Bg2DrawChannelCurrent = table_.Bg2DrawChannelUnfrozen
            IM_ASSERT(table_.Bg2ClipRectForDrawCmd.Min.y <= table_.Bg2ClipRectForDrawCmd.Max.y)

            local row_height = table_.RowPosY2 - table_.RowPosY1
            table_.RowPosY2 = table_.WorkRect.Min.y + table_.RowPosY2 - table_.OuterRect.Min.y
            window.DC.CursorPos.y = table_.RowPosY2
            table_.RowPosY1 = table_.RowPosY2 - row_height
            for column_n = 0, table_.ColumnsCount - 1 do
                local column = table_.Columns[column_n]
                column.DrawChannelCurrent = column.DrawChannelUnfrozen
                column.ClipRect.Min.y = table_.Bg2ClipRectForDrawCmd.Min.y
            end

            -- Update cliprect ahead of TableBeginCell() so clipper can access to new ClipRect->Min.y
            ImGui.SetWindowClipRectBeforeSetChannel(window, table_.Columns[0].ClipRect)
            table_.DrawSplitter:SetCurrentChannel(window.DrawList, table_.Columns[0].DrawChannelCurrent)
        end
    end

    if band(table_.RowFlags, ImGuiTableRowFlags.Headers) == 0 then
        table_.RowBgColorCounter = table_.RowBgColorCounter + 1
    end
    table_.IsInsideRow = false
end

----------------------------------------------------------------
-- [SECTION] Tables: Columns changes
----------------------------------------------------------------

function ImGui.TableGetColumnIndex()
    local g = GImGui
    local table_ = g.CurrentTable
    if not table_ then
        return 0
    end
    return table_.CurrentColumn
end

-- [Public] Append into a specific column
function ImGui.TableSetColumnIndex(column_n)
    local g = GImGui
    local table_ = g.CurrentTable
    if not table_ then
        return false
    end

    if table_.CurrentColumn ~= column_n then
        if table_.CurrentColumn ~= -1 then
            ImGui.TableEndCell(table_)
        end
        if not (column_n >= 0 and column_n < table_.ColumnsCount) then
            IM_ASSERT_USER_ERROR(false, "TableSetColumnIndex() invalid column index!")
            return false
        end
        ImGui.TableBeginCell(table_, column_n)
    end

    -- Return whether the column is visible. User may choose to skip submitting items based on this return value,
    -- however they shouldn't skip submitting for columns that may have the tallest contribution to row height.
    return table_.Columns[column_n].IsRequestOutput
end

-- [Public] Append into the next column, wrap and create a new row when already on last column
function ImGui.TableNextColumn()
    local g = GImGui
    local table_ = g.CurrentTable
    if not table_ then
        return false
    end

    if table_.IsInsideRow and table_.CurrentColumn + 1 < table_.ColumnsCount then
        if table_.CurrentColumn ~= -1 then
            ImGui.TableEndCell(table_)
        end
        ImGui.TableBeginCell(table_, table_.CurrentColumn + 1)
    else
        ImGui.TableNextRow()
        ImGui.TableBeginCell(table_, 0)
    end

    -- Return whether the column is visible. User may choose to skip submitting items based on this return value,
    -- however they shouldn't skip submitting for columns that may have the tallest contribution to row height.
    return table_.Columns[table_.CurrentColumn].IsRequestOutput
end

-- [Internal] Called by TableSetColumnIndex()/TableNextColumn()
-- This is called very frequently, so we need to be mindful of unnecessary overhead.
function ImGui.TableBeginCell(table_, column_n)
    local g = GImGui
    local column = table_.Columns[column_n]
    local window = table_.InnerWindow
    table_.CurrentColumn = column_n

    -- Start position is roughly ~~ CellRect.Min + CellPadding + Indent
    local start_x = column.WorkMinX
    if band(column.Flags, ImGuiTableColumnFlags.IndentEnable) ~= 0 then
        start_x = start_x + table_.RowIndentOffsetX -- ~~ += window.DC.Indent.x - table->HostIndentX, except we locked it for the row.
    end

    window.DC.CursorPos.x = start_x
    window.DC.CursorPos.y = table_.RowPosY1 + table_.RowCellPaddingY
    window.DC.CursorMaxPos.x = window.DC.CursorPos.x
    window.DC.ColumnsOffset.x = start_x - window.Pos.x - window.DC.Indent.x -- FIXME-WORKRECT
    window.DC.CursorPosPrevLine.x = window.DC.CursorPos.x -- PrevLine.y is preserved. This allows users to call SameLine() to share LineSize between columns.
    window.DC.CurrLineTextBaseOffset = table_.RowTextBaseline
    window.DC.NavLayerCurrent = column.NavLayerCurrent

    -- Note how WorkRect.Max.y is only set once during layout
    window.WorkRect.Min.y = window.DC.CursorPos.y
    window.WorkRect.Min.x = column.WorkMinX
    window.WorkRect.Max.x = column.WorkMaxX
    window.DC.ItemWidth = column.ItemWidth

    window.SkipItems = column.IsSkipItems
    if column.IsSkipItems then
        g.LastItemData.ID = 0
        g.LastItemData.StatusFlags = 0
    end

    -- Also see TablePushColumnChannel()
    if band(table_.Flags, ImGuiTableFlags.NoClip) ~= 0 then
        -- FIXME: if we end up drawing all borders/bg in EndTable, could remove this and just assert that channel hasn't changed.
        table_.DrawSplitter:SetCurrentChannel(window.DrawList, TABLE_DRAW_CHANNEL_NOCLIP)
    else
        -- FIXME-TABLE: Could avoid this if draw channel is dummy channel?
        ImGui.SetWindowClipRectBeforeSetChannel(window, column.ClipRect)
        table_.DrawSplitter:SetCurrentChannel(window.DrawList, column.DrawChannelCurrent)
    end

    -- Logging
    if g.LogEnabled and not column.IsSkipItems then
        ImGui.LogRenderedText(window.DC.CursorPos, "|")
        g.LogLinePosY = FLT_MAX
    end
end

-- [Internal] Called by TableNextRow()/TableSetColumnIndex()/TableNextColumn()
function ImGui.TableEndCell(table_)
    local column = table_.Columns[table_.CurrentColumn]
    local window = table_.InnerWindow

    if window.DC.IsSetPos then
        ImGui.ErrorCheckUsingSetCursorPosToExtendParentBoundaries()
    end

    -- Report maximum position so we can infer content size per column.
    local x = window.DC.CursorMaxPos.x
    if band(table_.RowFlags, ImGuiTableRowFlags.Headers) ~= 0 then
        column.ContentMaxXHeadersUsed = ImMax(column.ContentMaxXHeadersUsed, x) -- Useful in case user submit contents in header row that is not a TableHeader() call
    elseif table_.IsUnfrozenRows then
        column.ContentMaxXUnfrozen = ImMax(column.ContentMaxXUnfrozen, x)
    else
        column.ContentMaxXFrozen = ImMax(column.ContentMaxXFrozen, x)
    end
    if column.IsEnabled then
        table_.RowPosY2 = ImMax(table_.RowPosY2, window.DC.CursorMaxPos.y + table_.RowCellPaddingY)
    end
    column.ItemWidth = window.DC.ItemWidth

    -- Propagate text baseline for the entire row
    table_.RowTextBaseline = ImMax(table_.RowTextBaseline, window.DC.PrevLineTextBaseOffset)
end

----------------------------------------------------------------
-- [SECTION] Tables: Columns width management
----------------------------------------------------------------

-- Maximum column content width given current layout. Use column->MinX so this value differs on a per-column basis.
function ImGui.TableCalcMaxColumnWidth(table_, column_n)
    local column = table_.Columns[column_n]
    local max_width = FLT_MAX
    local min_column_distance = table_.MinColumnWidth + table_.CellPaddingX * 2.0 + table_.CellSpacingX1 + table_.CellSpacingX2
    if band(table_.Flags, ImGuiTableFlags.ScrollX) ~= 0 then
        -- Frozen columns can't reach beyond visible width else scrolling will naturally break.
        if column.DisplayOrder < table_.FreezeColumnsRequest then
            max_width = (table_.InnerClipRect.Max.x - (table_.FreezeColumnsRequest - column.DisplayOrder) * min_column_distance) - column.MinX
            max_width = max_width - table_.OuterPaddingX - table_.CellPaddingX - table_.CellSpacingX2
        end
    elseif band(table_.Flags, ImGuiTableFlags.NoKeepColumnsVisible) == 0 then
        -- If horizontal scrolling if disabled, we apply a final lossless shrinking of columns in order to make sure they are all visible.
        max_width = table_.WorkRect.Max.x - (table_.ColumnsEnabledCount - column.IndexWithinEnabledSet - 1) * min_column_distance - column.MinX
        max_width = max_width - table_.CellSpacingX2
        max_width = max_width - table_.CellPaddingX * 2.0
        max_width = max_width - table_.OuterPaddingX
    end
    return max_width
end

-- Note this is meant to be stored in column->WidthAuto, please generally use the WidthAuto field
function ImGui.TableGetColumnWidthAuto(table_, column)
    local content_width_body = ImMax(column.ContentMaxXFrozen, column.ContentMaxXUnfrozen) - column.WorkMinX
    local content_width_headers = column.ContentMaxXHeadersIdeal - column.WorkMinX
    local width_auto = content_width_body
    if band(column.Flags, ImGuiTableColumnFlags.NoHeaderWidth) == 0 then
        width_auto = ImMax(width_auto, content_width_headers)
    end

    -- Non-resizable fixed columns preserve their requested width
    if band(column.Flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 and column.InitStretchWeightOrWidth > 0.0 then
        if band(table_.Flags, ImGuiTableFlags.Resizable) == 0 or band(column.Flags, ImGuiTableColumnFlags.NoResize) ~= 0 then
            width_auto = column.InitStretchWeightOrWidth
        end
    end

    return ImMax(width_auto, table_.MinColumnWidth)
end

-- 'width' = inner column width, without padding
function ImGui.TableSetColumnWidth(column_n, width)
    local g = GImGui
    local table_ = g.CurrentTable
    IM_ASSERT(table_ ~= nil and table_.IsLayoutLocked == false)
    IM_ASSERT(column_n >= 0 and column_n < table_.ColumnsCount)
    local column_0 = table_.Columns[column_n]
    local column_0_width = width

    -- Apply constraints early
    IM_ASSERT(table_.MinColumnWidth > 0.0)
    local min_width = table_.MinColumnWidth
    local max_width = ImMax(min_width, column_0.WidthMax) -- Don't use TableCalcMaxColumnWidth() here as it would rely on MinX from last instance (#7933)
    column_0_width = ImClamp(column_0_width, min_width, max_width)
    if column_0.WidthGiven == column_0_width or column_0.WidthRequest == column_0_width then
        return
    end

    local column_1 = (column_0.NextEnabledColumn ~= -1) and table_.Columns[column_0.NextEnabledColumn] or nil

    -- If we have all Fixed columns OR resizing a Fixed column that doesn't come after a Stretch one, we can do an offsetting resize.
    -- This is the preferred resize path
    if band(column_0.Flags, ImGuiTableColumnFlags.WidthFixed) ~= 0 then
        if not column_1 or table_.LeftMostStretchedColumn == -1 or table_.Columns[table_.LeftMostStretchedColumn].DisplayOrder >= column_0.DisplayOrder then
            column_0.WidthRequest = column_0_width
            table_.IsSettingsDirty = true
            return
        end
    end

    -- We can also use previous column if there's no next one (this is used when doing an auto-fit on the right-most stretch column)
    if column_1 == nil then
        column_1 = (column_0.PrevEnabledColumn ~= -1) and table_.Columns[column_0.PrevEnabledColumn] or nil
    end
    if column_1 == nil then
        return
    end

    -- Resizing from right-side of a Stretch column before a Fixed column forward sizing to left-side of fixed column.
    -- (old_a + old_b == new_a + new_b) --> (new_a == old_a + old_b - new_b)
    local column_1_width = ImMax(column_1.WidthRequest - (column_0_width - column_0.WidthRequest), min_width)
    column_0_width = column_0.WidthRequest + column_1.WidthRequest - column_1_width
    IM_ASSERT(column_0_width > 0.0 and column_1_width > 0.0)
    column_0.WidthRequest = column_0_width
    column_1.WidthRequest = column_1_width
    if band(bor(column_0.Flags, column_1.Flags), ImGuiTableColumnFlags.WidthStretch) ~= 0 then
        ImGui.TableUpdateColumnsWeightFromWidth(table_)
    end
    table_.IsSettingsDirty = true
end

-- Disable clipping then auto-fit, will take 2 frames
function ImGui.TableSetColumnWidthAutoSingle(table_, column_n)
    -- Single auto width uses auto-fit
    local column = table_.Columns[column_n]
    if not column.IsEnabled then
        return
    end
    column.CannotSkipItemsQueue = lshift(1, 0)
    table_.AutoFitSingleColumn = column_n
end

function ImGui.TableSetColumnWidthAutoAll(table_)
    for column_n = 0, table_.ColumnsCount - 1 do
        local column = table_.Columns[column_n]
        if column.IsEnabled or band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0 then -- Cannot reset weight of hidden stretch column
            column.CannotSkipItemsQueue = lshift(1, 0)
            column.AutoFitQueue = lshift(1, 1)
        end
    end
end

function ImGui.TableUpdateColumnsWeightFromWidth(table_)
    IM_ASSERT(table_.LeftMostStretchedColumn ~= -1 and table_.RightMostStretchedColumn ~= -1)

    -- Measure existing quantities
    local visible_weight = 0.0
    local visible_width = 0.0
    for column_n = 0, table_.ColumnsCount - 1 do
        local column = table_.Columns[column_n]
        if column.IsEnabled and band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0 then
            IM_ASSERT(column.StretchWeight > 0.0)
            visible_weight = visible_weight + column.StretchWeight
            visible_width = visible_width + column.WidthRequest
        end
    end
    IM_ASSERT(visible_weight > 0.0 and visible_width > 0.0)

    -- Apply new weights
    for column_n = 0, table_.ColumnsCount - 1 do
        local column = table_.Columns[column_n]
        if column.IsEnabled and band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0 then
            column.StretchWeight = (column.WidthRequest / visible_width) * visible_weight
            IM_ASSERT(column.StretchWeight > 0.0)
        end
    end
end

----------------------------------------------------------------
-- [SECTION] Tables: Drawing
----------------------------------------------------------------

-- Bg2 is used by Selectable (and possibly other widgets) to render to the background.
function ImGui.TablePushBackgroundChannel()
    local g = GImGui
    local window = g.CurrentWindow
    local table_ = g.CurrentTable

    -- Optimization: avoid SetCurrentChannel() + PushClipRect()
    ImRect_Copy(table_.HostBackupInnerClipRect, window.ClipRect)
    ImGui.SetWindowClipRectBeforeSetChannel(window, table_.Bg2ClipRectForDrawCmd)
    table_.DrawSplitter:SetCurrentChannel(window.DrawList, table_.Bg2DrawChannelCurrent)
end

function ImGui.TablePopBackgroundChannel()
    local g = GImGui
    local window = g.CurrentWindow
    local table_ = g.CurrentTable

    -- Optimization: avoid PopClipRect() + SetCurrentChannel()
    ImGui.SetWindowClipRectBeforeSetChannel(window, table_.HostBackupInnerClipRect)
    table_.DrawSplitter:SetCurrentChannel(window.DrawList, table_.Columns[table_.CurrentColumn].DrawChannelCurrent)
end

-- Also see TableBeginCell()
function ImGui.TablePushColumnChannel(column_n)
    local g = GImGui
    local table_ = g.CurrentTable

    -- Optimization: avoid SetCurrentChannel() + PushClipRect()
    if band(table_.Flags, ImGuiTableFlags.NoClip) ~= 0 then
        return
    end
    local window = g.CurrentWindow
    local column = table_.Columns[column_n]
    ImGui.SetWindowClipRectBeforeSetChannel(window, column.ClipRect)
    table_.DrawSplitter:SetCurrentChannel(window.DrawList, column.DrawChannelCurrent)
end

function ImGui.TablePopColumnChannel()
    local g = GImGui
    local table_ = g.CurrentTable

    -- Optimization: avoid PopClipRect() + SetCurrentChannel()
    if band(table_.Flags, ImGuiTableFlags.NoClip) ~= 0 or (table_.CurrentColumn == -1) then -- Calling TreePop() after TableNextRow() is supported.
        return
    end
    local window = g.CurrentWindow
    local column = table_.Columns[table_.CurrentColumn]
    ImGui.SetWindowClipRectBeforeSetChannel(window, column.ClipRect)
    table_.DrawSplitter:SetCurrentChannel(window.DrawList, column.DrawChannelCurrent)
end

-- Allocate draw channels. Called by TableUpdateLayout()
function ImGui.TableSetupDrawChannels(table_)
    local freeze_row_multiplier = (table_.FreezeRowsCount > 0) and 2 or 1
    local channels_for_row = (band(table_.Flags, ImGuiTableFlags.NoClip) ~= 0) and 1 or table_.ColumnsEnabledCount
    local channels_for_bg = 1 + 1 * freeze_row_multiplier
    local masks_differ = false
    for n = 0, table_.ColumnsCount - 1 do
        if (table_.VisibleMaskByIndex[n] == true) ~= (table_.EnabledMaskByIndex[n] == true) then
            masks_differ = true
            break
        end
    end
    local channels_for_dummy = (table_.ColumnsEnabledCount < table_.ColumnsCount or masks_differ) and 1 or 0
    local channels_total = channels_for_bg + (channels_for_row * freeze_row_multiplier) + channels_for_dummy
    table_.DrawSplitter:Split(table_.InnerWindow.DrawList, channels_total)
    table_.DummyDrawChannel = (channels_for_dummy > 0) and (channels_total - 1) or -1
    table_.Bg2DrawChannelCurrent = TABLE_DRAW_CHANNEL_BG2_FROZEN
    table_.Bg2DrawChannelUnfrozen = (table_.FreezeRowsCount > 0) and (2 + channels_for_row) or TABLE_DRAW_CHANNEL_BG2_FROZEN

    local draw_channel_current = 2
    for column_n = 0, table_.ColumnsCount - 1 do
        local column = table_.Columns[column_n]
        if column.IsVisibleX and column.IsVisibleY then
            column.DrawChannelFrozen = draw_channel_current
            column.DrawChannelUnfrozen = draw_channel_current + ((table_.FreezeRowsCount > 0) and (channels_for_row + 1) or 0)
            if band(table_.Flags, ImGuiTableFlags.NoClip) == 0 then
                draw_channel_current = draw_channel_current + 1
            end
        else
            column.DrawChannelFrozen = table_.DummyDrawChannel
            column.DrawChannelUnfrozen = table_.DummyDrawChannel
        end
        column.DrawChannelCurrent = column.DrawChannelFrozen
    end

    -- Initial draw cmd starts with a BgClipRect that matches the one of its host, to facilitate merge draw commands by default.
    ImRect_Copy(table_.BgClipRect, table_.InnerClipRect)
    ImRect_Copy(table_.Bg0ClipRectForDrawCmd, table_.OuterWindow.ClipRect)
    ImRect_Copy(table_.Bg2ClipRectForDrawCmd, table_.HostClipRect)
    IM_ASSERT(table_.BgClipRect.Min.y <= table_.BgClipRect.Max.y)
end

-- This function reorder draw channels based on matching clip rectangle, to facilitate merging them. Called by EndTable().
-- (Lua: splitter channel n lives in splitter._Channels.Data[n + 1]; bit arrays are Lua sets)
function ImGui.TableMergeDrawChannels(table_)
    local splitter = table_.DrawSplitter
    local channels = splitter._Channels.Data
    local has_freeze_v = (table_.FreezeRowsCount > 0)
    local has_freeze_h = (table_.FreezeColumnsCount > 0)
    IM_ASSERT(splitter._Current == 0)

    -- Track which groups we are going to attempt to merge, and which channels goes into each group.
    local merge_group_mask = 0x00
    local merge_groups = {}
    for n = 0, 3 do
        merge_groups[n] = { ClipRect = ImRect(), ChannelsCount = 0, ChannelsMask = {} }
    end
    local max_draw_channels = (4 + table_.ColumnsCount * 2)
    local remaining_mask = {}

    -- 1. Scan channels and take note of those which can be merged
    for column_n = 0, table_.ColumnsCount - 1 do
        if BitTest(table_.VisibleMaskByIndex, column_n) then
            local column = table_.Columns[column_n]

            local merge_group_sub_count = has_freeze_v and 2 or 1
            for merge_group_sub_n = 0, merge_group_sub_count - 1 do
                repeat
                    local channel_no = (merge_group_sub_n == 0) and column.DrawChannelFrozen or column.DrawChannelUnfrozen

                    -- Don't attempt to merge if there are multiple draw calls within the column
                    local src_channel = channels[channel_no + 1]
                    local cmds = src_channel._CmdBuffer
                    if cmds.Size > 0 and cmds.Data[cmds.Size].ElemCount == 0 and cmds.Data[cmds.Size].UserCallback == nil then -- Equivalent of PopUnusedDrawCmd()
                        cmds:pop_back()
                    end
                    if cmds.Size ~= 1 then
                        break
                    end

                    -- Find out the width of this merge group and check if it will fit in our column
                    if band(column.Flags, ImGuiTableColumnFlags.NoClip) == 0 then
                        local content_max_x
                        if not has_freeze_v then
                            content_max_x = ImMax(column.ContentMaxXUnfrozen, column.ContentMaxXHeadersUsed) -- No row freeze
                        elseif merge_group_sub_n == 0 then
                            content_max_x = ImMax(column.ContentMaxXFrozen, column.ContentMaxXHeadersUsed)   -- Row freeze: use width before freeze
                        else
                            content_max_x = column.ContentMaxXUnfrozen                                        -- Row freeze: use width after freeze
                        end
                        if content_max_x > column.ClipRect.Max.x then
                            break
                        end
                    end

                    local merge_group_n = ((has_freeze_h and column_n < table_.FreezeColumnsCount) and 0 or 1) + ((has_freeze_v and merge_group_sub_n == 0) and 0 or 2)
                    IM_ASSERT(channel_no < max_draw_channels)
                    local merge_group = merge_groups[merge_group_n]
                    if merge_group.ChannelsCount == 0 then
                        merge_group.ClipRect = ImRect(FLT_MAX, FLT_MAX, -FLT_MAX, -FLT_MAX)
                    end
                    merge_group.ChannelsMask[channel_no] = true
                    merge_group.ChannelsCount = merge_group.ChannelsCount + 1
                    local cr = cmds.Data[1].ClipRect
                    merge_group.ClipRect:Add(ImRect(cr.x, cr.y, cr.z, cr.w))
                    merge_group_mask = bor(merge_group_mask, lshift(1, merge_group_n))
                until true
            end

            -- Invalidate current draw channel
            column.DrawChannelCurrent = -1
        end
    end

    -- 2. Rewrite channel list in our preferred order
    if merge_group_mask ~= 0 then
        -- We skip channel 0 (Bg0/Bg1) and 1 (Bg2 frozen) from the shuffling since they won't move - see channels allocation in TableSetupDrawChannels().
        local LEADING_DRAW_CHANNELS = 2
        local dst_tmp = {}
        for n = LEADING_DRAW_CHANNELS, splitter._Count - 1 do
            remaining_mask[n] = true
        end
        remaining_mask[table_.Bg2DrawChannelUnfrozen] = nil
        IM_ASSERT(has_freeze_v == false or table_.Bg2DrawChannelUnfrozen ~= TABLE_DRAW_CHANNEL_BG2_FROZEN)
        local remaining_count = splitter._Count - (has_freeze_v and (LEADING_DRAW_CHANNELS + 1) or LEADING_DRAW_CHANNELS)
        local host_rect = table_.HostClipRect
        for merge_group_n = 0, 3 do
            local merge_channels_count = merge_groups[merge_group_n].ChannelsCount
            if merge_channels_count ~= 0 then
                local merge_group = merge_groups[merge_group_n]
                local merge_clip_rect = Rect(merge_group.ClipRect)

                -- Extend outer-most clip limits to match those of host, so draw calls can be merged even if
                -- outer-most columns have some outer padding offsetting them from their parent ClipRect.
                if band(merge_group_n, 1) == 0 or not has_freeze_h then
                    merge_clip_rect.Min.x = ImMin(merge_clip_rect.Min.x, host_rect.Min.x)
                end
                if band(merge_group_n, 2) == 0 or not has_freeze_v then
                    merge_clip_rect.Min.y = ImMin(merge_clip_rect.Min.y, host_rect.Min.y)
                end
                if band(merge_group_n, 1) ~= 0 then
                    merge_clip_rect.Max.x = ImMax(merge_clip_rect.Max.x, host_rect.Max.x)
                end
                if band(merge_group_n, 2) ~= 0 and band(table_.Flags, ImGuiTableFlags.NoHostExtendY) == 0 then
                    merge_clip_rect.Max.y = ImMax(merge_clip_rect.Max.y, host_rect.Max.y)
                end
                remaining_count = remaining_count - merge_group.ChannelsCount
                for n in pairs(merge_group.ChannelsMask) do
                    remaining_mask[n] = nil
                end
                local n = 0
                while n < splitter._Count and merge_channels_count ~= 0 do
                    -- Copy + overwrite new clip rect
                    if merge_group.ChannelsMask[n] then
                        merge_group.ChannelsMask[n] = nil
                        merge_channels_count = merge_channels_count - 1

                        local channel = channels[n + 1]
                        IM_ASSERT(channel._CmdBuffer.Size == 1)
                        ImVec4_Copy(channel._CmdBuffer.Data[1].ClipRect, merge_clip_rect:ToVec4())
                        dst_tmp[#dst_tmp + 1] = channel
                    end
                    n = n + 1
                end
            end

            -- Make sure Bg2DrawChannelUnfrozen appears in the middle of our groups (whereas Bg0/Bg1 and Bg2 frozen are fixed to 0 and 1)
            if merge_group_n == 1 and has_freeze_v then
                dst_tmp[#dst_tmp + 1] = channels[table_.Bg2DrawChannelUnfrozen + 1]
            end
        end

        -- Append unmergeable channels that we didn't reorder at the end of the list
        local n = 0
        while n < splitter._Count and remaining_count ~= 0 do
            if remaining_mask[n] then
                dst_tmp[#dst_tmp + 1] = channels[n + 1]
                remaining_count = remaining_count - 1
            end
            n = n + 1
        end
        IM_ASSERT(#dst_tmp == splitter._Count - LEADING_DRAW_CHANNELS)
        for i = 1, #dst_tmp do
            channels[LEADING_DRAW_CHANNELS + i] = dst_tmp[i]
        end
    end
end

local function TableGetColumnBorderCol(table_, order_n, column_n)
    local is_hovered = (table_.HoveredColumnBorder == column_n)
    local is_resized = (table_.ResizedColumn == column_n) and (table_.InstanceInteracted == table_.InstanceCurrent)
    local is_frozen_separator = (table_.FreezeColumnsCount == order_n + 1)
    if is_resized or is_hovered then
        return ImGui.GetColorU32(is_resized and ImGuiCol.SeparatorActive or ImGuiCol.SeparatorHovered)
    end
    if is_frozen_separator or band(table_.Flags, bor(ImGuiTableFlags.NoBordersInBody, ImGuiTableFlags.NoBordersInBodyUntilResize)) ~= 0 then
        return table_.BorderColorStrong
    end
    return table_.BorderColorLight
end

-- FIXME-TABLE: This is a mess, need to redesign how we render borders (as some are also done in TableEndRow)
function ImGui.TableDrawBorders(table_)
    local inner_window = table_.InnerWindow
    if not table_.OuterWindow.ClipRect:Overlaps(table_.OuterRect) then
        return
    end

    local inner_drawlist = inner_window.DrawList
    table_.DrawSplitter:SetCurrentChannel(inner_drawlist, TABLE_DRAW_CHANNEL_BG0)
    inner_drawlist:PushClipRect(table_.Bg0ClipRectForDrawCmd.Min, table_.Bg0ClipRectForDrawCmd.Max, false)

    -- Draw inner border and resizing feedback
    local table_instance = ImGui.TableGetInstanceData(table_, table_.InstanceCurrent)
    local border_size = TABLE_BORDER_SIZE
    local draw_y1 = ImMax(table_.InnerRect.Min.y, ((table_.FreezeRowsCount >= 1) and table_.InnerRect.Min.y or table_.WorkRect.Min.y) + table_.AngledHeadersHeight) + ((band(table_.Flags, ImGuiTableFlags.BordersOuterH) ~= 0) and border_size or 0.0)
    local draw_y2_body = table_.InnerRect.Max.y
    local draw_y2_head = table_.IsUsingHeaders and ImMin(table_.InnerRect.Max.y, ((table_.FreezeRowsCount >= 1) and table_.InnerRect.Min.y or table_.WorkRect.Min.y) + table_instance.LastTopHeadersRowHeight) or draw_y1
    if band(table_.Flags, ImGuiTableFlags.BordersInnerV) ~= 0 then
        for order_n = 0, table_.ColumnsCount - 1 do
            repeat
                if not BitTest(table_.EnabledMaskByDisplayOrder, order_n) then
                    break
                end

                local column_n = table_.DisplayOrderToIndex[order_n]
                local column = table_.Columns[column_n]
                local is_hovered = (table_.HoveredColumnBorder == column_n)
                local is_resized = (table_.ResizedColumn == column_n) and (table_.InstanceInteracted == table_.InstanceCurrent)
                local is_resizable = band(column.Flags, bor(ImGuiTableColumnFlags.NoResize, ImGuiTableColumnFlags.NoDirectResize_)) == 0
                local is_frozen_separator = (table_.FreezeColumnsCount == order_n + 1)
                if column.MaxX > table_.InnerClipRect.Max.x and not is_resized then
                    break
                end

                -- Decide whether right-most column is visible
                if column.NextEnabledColumn == -1 and not is_resizable then
                    if band(table_.Flags, ImGuiTableFlags.SizingMask_) ~= ImGuiTableFlags.SizingFixedSame or band(table_.Flags, ImGuiTableFlags.NoHostExtendX) ~= 0 then
                        break
                    end
                end
                if column.MaxX <= column.ClipRect.Min.x then -- FIXME-TABLE FIXME-STYLE: Assume BorderSize==1, this is problematic if we want to increase the border size..
                    break
                end

                -- Draw in outer window so right-most column won't be clipped
                local draw_y2 = draw_y2_head
                if is_frozen_separator then
                    draw_y2 = draw_y2_body
                elseif band(table_.Flags, ImGuiTableFlags.NoBordersInBodyUntilResize) ~= 0 and (is_hovered or is_resized) then
                    draw_y2 = draw_y2_body
                elseif band(table_.Flags, bor(ImGuiTableFlags.NoBordersInBodyUntilResize, ImGuiTableFlags.NoBordersInBody)) == 0 then
                    draw_y2 = draw_y2_body
                end
                if draw_y2 > draw_y1 then
                    inner_drawlist:AddLineV(column.MaxX, draw_y1, draw_y2, TableGetColumnBorderCol(table_, order_n, column_n), border_size)
                end
            until true
        end
    end

    -- Draw outer border
    if band(table_.Flags, ImGuiTableFlags.BordersOuter) ~= 0 then
        local outer_border = table_.OuterRect
        local outer_col = table_.BorderColorStrong
        if band(table_.Flags, ImGuiTableFlags.BordersOuter) == ImGuiTableFlags.BordersOuter then
            inner_drawlist:AddRect(outer_border.Min, outer_border.Max, outer_col, 0.0, border_size)
        elseif band(table_.Flags, ImGuiTableFlags.BordersOuterV) ~= 0 then
            inner_drawlist:AddLineV(outer_border.Min.x, outer_border.Min.y, outer_border.Max.y, outer_col, border_size)
            inner_drawlist:AddLineV(outer_border.Max.x - border_size, outer_border.Min.y, outer_border.Max.y, outer_col, border_size)
        elseif band(table_.Flags, ImGuiTableFlags.BordersOuterH) ~= 0 then
            inner_drawlist:AddLineH(outer_border.Min.x, outer_border.Max.x, outer_border.Min.y, outer_col, border_size)
            inner_drawlist:AddLineH(outer_border.Min.x, outer_border.Max.x, outer_border.Max.y - border_size, outer_col, border_size)
        end
    end
    if band(table_.Flags, ImGuiTableFlags.BordersInnerH) ~= 0 and table_.RowPosY2 < table_.OuterRect.Max.y then
        -- Draw bottom-most row border between it is above outer border.
        local h_inset = (band(table_.Flags, ImGuiTableFlags.BordersOuterV) ~= 0) and border_size or 0.0
        local border_y = table_.RowPosY2
        if border_y >= table_.BgClipRect.Min.y and border_y < table_.BgClipRect.Max.y then
            inner_drawlist:AddLineH(table_.BorderX1 + h_inset, table_.BorderX2 - h_inset, border_y, table_.BorderColorLight, border_size)
        end
    end

    inner_drawlist:PopClipRect()
end

----------------------------------------------------------------
-- [SECTION] Tables: Sorting
----------------------------------------------------------------

-- Return nil if no sort specs (most often when ImGuiTableFlags_Sortable is not set)
-- When 'sort_specs.SpecsDirty == true' you should sort your data. Specs is a 1-based Lua array.
function ImGui.TableGetSortSpecs()
    local g = GImGui
    local table_ = g.CurrentTable
    if table_ == nil or band(table_.Flags, ImGuiTableFlags.Sortable) == 0 then
        return nil
    end

    -- Require layout (in case TableHeadersRow() hasn't been called) as it may alter IsSortSpecsDirty in some paths.
    if not table_.IsLayoutLocked then
        ImGui.TableUpdateLayout(table_)
    end

    ImGui.TableSortSpecsBuild(table_)
    return table_.SortSpecs
end

local function TableGetColumnAvailSortDirection(column, n)
    IM_ASSERT(n < column.SortDirectionsAvailCount)
    return band(rshift(column.SortDirectionsAvailList, lshift(n, 1)), 0x03)
end

-- Fix sort direction if currently set on a value which is unavailable (e.g. activating NoSortAscending/NoSortDescending)
function ImGui.TableFixColumnSortDirection(table_, column)
    if column.SortOrder == -1 or band(column.SortDirectionsAvailMask, lshift(1, column.SortDirection)) ~= 0 then
        return
    end
    column.SortDirection = TableGetColumnAvailSortDirection(column, 0)
    table_.IsSortSpecsDirty = true
end

-- Calculate next sort direction that would be set after clicking the column
function ImGui.TableGetColumnNextSortDirection(column)
    IM_ASSERT(column.SortDirectionsAvailCount > 0)
    if column.SortOrder == -1 then
        return TableGetColumnAvailSortDirection(column, 0)
    end
    for n = 0, 2 do
        if column.SortDirection == TableGetColumnAvailSortDirection(column, n) then
            return TableGetColumnAvailSortDirection(column, (n + 1) % column.SortDirectionsAvailCount)
        end
    end
    IM_ASSERT(false)
    return ImGuiSortDirection.None
end

-- Note that the NoSortAscending/NoSortDescending flags are processed in TableSortSpecsSanitize(), and they may change/revert
-- the value of SortDirection. We could technically also do it here but it would be unnecessary and duplicate code.
function ImGui.TableSetColumnSortDirection(column_n, sort_direction, append_to_sort_specs)
    local g = GImGui
    local table_ = g.CurrentTable

    if band(table_.Flags, ImGuiTableFlags.SortMulti) == 0 then
        append_to_sort_specs = false
    end
    if band(table_.Flags, ImGuiTableFlags.SortTristate) == 0 then
        IM_ASSERT(sort_direction ~= ImGuiSortDirection.None)
    end

    local sort_order_max = 0
    if append_to_sort_specs then
        for other_column_n = 0, table_.ColumnsCount - 1 do
            sort_order_max = ImMax(sort_order_max, table_.Columns[other_column_n].SortOrder)
        end
    end

    local column = table_.Columns[column_n]
    column.SortDirection = sort_direction
    if column.SortDirection == ImGuiSortDirection.None then
        column.SortOrder = -1
    elseif column.SortOrder == -1 or not append_to_sort_specs then
        column.SortOrder = append_to_sort_specs and (sort_order_max + 1) or 0
    end

    for other_column_n = 0, table_.ColumnsCount - 1 do
        local other_column = table_.Columns[other_column_n]
        if other_column ~= column and not append_to_sort_specs then
            other_column.SortOrder = -1
        end
        ImGui.TableFixColumnSortDirection(table_, other_column)
    end
    table_.IsSettingsDirty = true
    table_.IsSortSpecsDirty = true
end

function ImGui.TableSortSpecsSanitize(table_)
    IM_ASSERT(band(table_.Flags, ImGuiTableFlags.Sortable) ~= 0)

    -- Clear SortOrder from hidden column and verify that there's no gap or duplicate.
    local sort_order_count = 0
    local sort_order_set = {} -- C++: ImU64 sort_order_mask
    local sort_order_dup = false
    for column_n = 0, table_.ColumnsCount - 1 do
        local column = table_.Columns[column_n]
        if column.SortOrder ~= -1 and not column.IsEnabled then
            column.SortOrder = -1
        end
        if column.SortOrder ~= -1 then
            sort_order_count = sort_order_count + 1
            if sort_order_set[column.SortOrder] then sort_order_dup = true end
            sort_order_set[column.SortOrder] = true
            IM_ASSERT(sort_order_count < 64)
        end
    end

    -- need_fix_linearize: (1 << count) != (mask + 1) <=> the set of sort orders isn't exactly {0..count-1}
    local need_fix_linearize = sort_order_dup
    for n = 0, sort_order_count - 1 do
        if not sort_order_set[n] then need_fix_linearize = true end
    end
    local need_fix_single_sort_order = (sort_order_count > 1) and band(table_.Flags, ImGuiTableFlags.SortMulti) == 0
    if need_fix_linearize or need_fix_single_sort_order then
        local fixed_mask = {}
        for sort_n = 0, sort_order_count - 1 do
            -- Fix: Rewrite sort order fields if needed so they have no gap or duplicate.
            local column_with_smallest_sort_order = -1
            for column_n = 0, table_.ColumnsCount - 1 do
                if not fixed_mask[column_n] and table_.Columns[column_n].SortOrder ~= -1 then
                    if column_with_smallest_sort_order == -1 or table_.Columns[column_n].SortOrder < table_.Columns[column_with_smallest_sort_order].SortOrder then
                        column_with_smallest_sort_order = column_n
                    end
                end
            end
            IM_ASSERT(column_with_smallest_sort_order ~= -1)
            fixed_mask[column_with_smallest_sort_order] = true
            table_.Columns[column_with_smallest_sort_order].SortOrder = sort_n

            -- Fix: Make sure only one column has a SortOrder if ImGuiTableFlags_MultiSortable is not set.
            if need_fix_single_sort_order then
                sort_order_count = 1
                for column_n = 0, table_.ColumnsCount - 1 do
                    if column_n ~= column_with_smallest_sort_order then
                        table_.Columns[column_n].SortOrder = -1
                    end
                end
                break
            end
        end
    end

    -- Fallback default sort order (if no column with the ImGuiTableColumnFlags_DefaultSort flag)
    if sort_order_count == 0 and band(table_.Flags, ImGuiTableFlags.SortTristate) == 0 then
        for column_n = 0, table_.ColumnsCount - 1 do
            local column = table_.Columns[column_n]
            if column.IsEnabled and band(column.Flags, ImGuiTableColumnFlags.NoSort) == 0 then
                sort_order_count = 1
                column.SortOrder = 0
                column.SortDirection = TableGetColumnAvailSortDirection(column, 0)
                break
            end
        end
    end

    table_.SortSpecsCount = sort_order_count
end

function ImGui.TableSortSpecsBuild(table_)
    local dirty = table_.IsSortSpecsDirty
    if dirty then
        ImGui.TableSortSpecsSanitize(table_)
        local multi = table_.SortSpecsMulti
        local want = (table_.SortSpecsCount <= 1) and 0 or table_.SortSpecsCount
        for n = #multi + 1, want do multi[n] = ImGuiTableColumnSortSpecs() end
        for n = #multi, want + 1, -1 do multi[n] = nil end
        table_.SortSpecs.SpecsDirty = true -- Mark as dirty for user
        table_.IsSortSpecsDirty = false -- Mark as not dirty for us
    end

    -- Write output
    local sort_specs
    if table_.SortSpecsCount == 0 then
        sort_specs = nil
    elseif table_.SortSpecsCount == 1 then
        table_.SortSpecsSingleArray = table_.SortSpecsSingleArray or { table_.SortSpecsSingle }
        sort_specs = table_.SortSpecsSingleArray
    else
        sort_specs = table_.SortSpecsMulti
    end
    if dirty and sort_specs ~= nil then
        for column_n = 0, table_.ColumnsCount - 1 do
            local column = table_.Columns[column_n]
            if column.SortOrder ~= -1 then
                IM_ASSERT(column.SortOrder < table_.SortSpecsCount)
                local sort_spec = sort_specs[column.SortOrder + 1]
                sort_spec.ColumnUserID = column.UserData
                sort_spec.ColumnIndex = column_n
                sort_spec.SortOrder = column.SortOrder
                sort_spec.SortDirection = column.SortDirection
            end
        end
    end

    table_.SortSpecs.Specs = sort_specs
    table_.SortSpecs.SpecsCount = table_.SortSpecsCount
end

----------------------------------------------------------------
-- [SECTION] Tables: Headers
----------------------------------------------------------------

function ImGui.TableGetHeaderRowHeight()
    -- Calculate row height, for the unlikely case that some labels may be taller than others.
    local g = GImGui
    local table_ = g.CurrentTable
    local row_height = g.FontSize
    for column_n = 0, table_.ColumnsCount - 1 do
        if BitTest(table_.EnabledMaskByIndex, column_n) then
            if band(table_.Columns[column_n].Flags, ImGuiTableColumnFlags.NoHeaderLabel) == 0 then
                row_height = ImMax(row_height, ImGui.CalcTextSize(ImGui.TableGetColumnName(table_, column_n)).y)
            end
        end
    end
    return row_height + g.Style.CellPadding.y * 2.0
end

function ImGui.TableGetHeaderAngledMaxLabelWidth()
    local g = GImGui
    local table_ = g.CurrentTable
    local width = 0.0
    for column_n = 0, table_.ColumnsCount - 1 do
        if BitTest(table_.EnabledMaskByIndex, column_n) then
            if band(table_.Columns[column_n].Flags, ImGuiTableColumnFlags.AngledHeader) ~= 0 then
                width = ImMax(width, ImGui.CalcTextSize(ImGui.TableGetColumnName(table_, column_n), nil, true).x)
            end
        end
    end
    return width + g.Style.CellPadding.y * 2.0 -- Swap padding
end

-- [Public] This is a helper to output TableHeader() calls based on the column names declared in TableSetupColumn().
function ImGui.TableHeadersRow()
    local g = GImGui
    local table_ = g.CurrentTable
    IM_ASSERT_USER_ERROR_RET(table_ ~= nil, "Call should only be done while in BeginTable() scope!")

    -- Call layout if not already done. This is automatically done by TableNextRow: we do it here _only_ to make
    -- it easier to debug-step in TableUpdateLayout(). Your own version of this function doesn't need this.
    if not table_.IsLayoutLocked then
        ImGui.TableUpdateLayout(table_)
    end

    -- Open row
    local row_height = ImGui.TableGetHeaderRowHeight()
    ImGui.TableNextRow(ImGuiTableRowFlags.Headers, row_height)
    local row_y1 = ImGui.GetCursorScreenPos().y
    if table_.HostSkipItems then -- Merely an optimization, you may skip in your own code.
        return
    end

    local columns_count = ImGui.TableGetColumnCount()
    for column_n = 0, columns_count - 1 do
        if ImGui.TableSetColumnIndex(column_n) or table_.LastHeldHeaderColumn == column_n then
            -- Push an id to allow empty/unnamed headers. This is also idiomatic as it ensure there is a consistent ID path to access columns (for e.g. automation)
            local name = (band(ImGui.TableGetColumnFlags(column_n), ImGuiTableColumnFlags.NoHeaderLabel) ~= 0) and "" or ImGui.TableGetColumnName(column_n)
            ImGui.PushID(column_n)
            ImGui.TableHeader(name)
            ImGui.PopID()
        end
    end

    -- Allow opening popup from the right-most section after the last column.
    local mouse_pos = ImGui.GetMousePos()
    if ImGui.IsMouseReleased(1) and ImGui.TableGetHoveredColumn() == columns_count then
        if mouse_pos.y >= row_y1 and mouse_pos.y < row_y1 + row_height then
            ImGui.TableOpenContextMenu(columns_count) -- Will open a non-column-specific popup.
        end
    end
end

-- Emit a column header (text + optional sort order)
-- We cpu-clip text here so that all columns headers can be merged into a same draw call.
function ImGui.TableHeader(label)
    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then
        return
    end

    local table_ = g.CurrentTable
    IM_ASSERT_USER_ERROR_RET(table_ ~= nil, "Call should only be done while in BeginTable() scope!")
    IM_ASSERT(table_.CurrentColumn ~= -1)
    local column_n = table_.CurrentColumn
    local column = table_.Columns[column_n]

    -- Label
    if label == nil then
        label = ""
    end
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)
    local label_pos = V2(window.DC.CursorPos)

    -- If we already got a row height, there's use that.
    local cell_r = ImGui.TableGetCellBgRect(table_, column_n)
    local label_height = ImMax(label_size.y, table_.RowMinHeight - table_.RowCellPaddingY * 2.0)

    -- Calculate ideal size for sort order arrow
    local w_arrow = 0.0
    local w_sort_text = 0.0
    local sort_arrow = false
    local sort_order_suf = ""
    local ARROW_SCALE = 0.65
    if band(table_.Flags, ImGuiTableFlags.Sortable) ~= 0 and band(column.Flags, ImGuiTableColumnFlags.NoSort) == 0 then
        w_arrow = ImTrunc(g.FontSize * ARROW_SCALE + g.Style.FramePadding.x)
        if column.SortOrder ~= -1 then
            sort_arrow = true
        end
        if column.SortOrder > 0 then
            sort_order_suf = string.format("%d", column.SortOrder + 1)
            w_sort_text = g.Style.ItemInnerSpacing.x + ImGui.CalcTextSize(sort_order_suf).x
        end
    end

    -- We feed our unclipped width to the column without writing on CursorMaxPos, so that column is still considered for merging.
    local max_pos_x = label_pos.x + label_size.x + w_sort_text + w_arrow
    column.ContentMaxXHeadersUsed = ImMax(column.ContentMaxXHeadersUsed, sort_arrow and cell_r.Max.x or ImMin(max_pos_x, cell_r.Max.x))
    column.ContentMaxXHeadersIdeal = ImMax(column.ContentMaxXHeadersIdeal, max_pos_x)

    -- Keep header highlighted when context menu is open.
    local id = window:GetID(label)
    local bb = ImRect(cell_r.Min.x, cell_r.Min.y, cell_r.Max.x, ImMax(cell_r.Max.y, cell_r.Min.y + label_height + g.Style.CellPadding.y * 2.0))
    ImGui.ItemSize(ImVec2(0.0, label_height)) -- Don't declare unclipped width, it'll be fed ContentMaxPosHeadersIdeal
    if not ImGui.ItemAdd(bb, id) then
        return
    end

    -- Using AllowOverlap mode because we cover the whole cell, and we want user to be able to submit subsequent items.
    local highlight = (table_.HighlightColumnHeader == column_n)
    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id, ImGuiButtonFlags.AllowOverlap)
    if held or hovered or highlight then
        local col = ImGui.GetColorU32(held and ImGuiCol.HeaderActive or (hovered and ImGuiCol.HeaderHovered or ImGuiCol.Header))
        ImGui.TableSetBgColor(ImGuiTableBgTarget.CellBg, col, table_.CurrentColumn)
    else
        -- Submit single cell bg color in the case we didn't submit a full header row
        if band(table_.RowFlags, ImGuiTableRowFlags.Headers) == 0 then
            ImGui.TableSetBgColor(ImGuiTableBgTarget.CellBg, ImGui.GetColorU32(ImGuiCol.TableHeaderBg), table_.CurrentColumn)
        end
    end
    ImGui.RenderNavCursor(bb, id, ImGuiNavRenderCursorFlags.Compact, 0.0)
    if held then
        table_.HeldHeaderColumn = column_n
    end
    window.DC.CursorPos.y = window.DC.CursorPos.y - g.Style.ItemSpacing.y * 0.5

    -- Drag and drop to re-order columns.
    if held and band(table_.Flags, ImGuiTableFlags.Reorderable) ~= 0 and ImGui.IsMouseDragging(0) and not g.DragDropActive then
        table_.InstanceInteracted = table_.InstanceCurrent
        if g.IO.MouseDelta.x < 0.0 and g.IO.MousePos.x < cell_r.Min.x then
            local prev_column = (column.PrevEnabledColumn ~= -1) and table_.Columns[column.PrevEnabledColumn] or nil
            if prev_column then
                ImGui.TableQueueSetColumnDisplayOrder(table_, column_n, prev_column.DisplayOrder)
            end
        end
        if g.IO.MouseDelta.x > 0.0 and g.IO.MousePos.x > cell_r.Max.x then
            local next_column = (column.NextEnabledColumn ~= -1) and table_.Columns[column.NextEnabledColumn] or nil
            if next_column then
                ImGui.TableQueueSetColumnDisplayOrder(table_, column_n, next_column.DisplayOrder)
            end
        end
    end

    -- Sort order arrow
    local ellipsis_max = ImMax(cell_r.Max.x - (sort_arrow and (w_arrow + w_sort_text) or 0.0), label_pos.x)
    if band(table_.Flags, ImGuiTableFlags.Sortable) ~= 0 and band(column.Flags, ImGuiTableColumnFlags.NoSort) == 0 then
        if column.SortOrder ~= -1 then
            local x = ImMax(cell_r.Min.x, cell_r.Max.x - w_arrow - w_sort_text)
            local y = label_pos.y
            if column.SortOrder > 0 then
                ImGui.PushStyleColor(ImGuiCol.Text, ImGui.GetColorU32(ImGuiCol.Text, 0.70))
                ImGui.RenderText(ImVec2(x + g.Style.ItemInnerSpacing.x, y), sort_order_suf)
                ImGui.PopStyleColor()
                x = x + w_sort_text
            end
            ImGui.RenderArrow(window.DrawList, ImVec2(x, y), ImGui.GetColorU32(ImGuiCol.Text), (column.SortDirection == ImGuiSortDirection.Ascending) and ImGuiDir.Up or ImGuiDir.Down, ARROW_SCALE)
        end

        -- Handle clicking on column header to adjust Sort Order
        if pressed and table_.ReorderColumn ~= column_n then
            local sort_direction = ImGui.TableGetColumnNextSortDirection(column)
            ImGui.TableSetColumnSortDirection(column_n, sort_direction, g.IO.KeyShift)
        end
    end

    -- Render clipped label. Clipping here ensure that in the majority of situations, all our header cells will
    -- be merged into a single draw call.
    ImGui.RenderTextEllipsis(window.DrawList, label_pos, ImVec2(ellipsis_max, bb.Max.y), ellipsis_max, label, label_end, label_size)

    local text_clipped = label_size.x > (ellipsis_max - label_pos.x)
    if text_clipped and hovered and g.ActiveId == 0 then
        ImGui.SetItemTooltip("%s", string.sub(label, 1, label_end - 1))
    end

    -- We don't use BeginPopupContextItem() because we want the popup to stay up even after the column is hidden
    if ImGui.IsPopupOpenRequestForItem(ImGuiPopupFlags.None, id) then
        ImGui.TableOpenContextMenu(column_n)
    end
end

-- Unlike TableHeadersRow() it is not expected that you can reimplement or customize this with custom widgets.
function ImGui.TableAngledHeadersRow()
    local g = GImGui
    local table_ = g.CurrentTable
    local temp_data = table_.TempData
    temp_data.AngledHeadersRequests:resize(0)

    -- Which column needs highlight?
    local row_id = ImGui.GetID("##AngledHeaders")
    local table_instance = ImGui.TableGetInstanceData(table_, table_.InstanceCurrent)
    local highlight_column_n = (table_.LastHeldHeaderColumn ~= -1) and table_.LastHeldHeaderColumn or table_.HighlightColumnHeader
    if highlight_column_n == -1 and table_.HoveredColumnBody ~= -1 then
        if table_instance.HoveredRowLast == 0 and table_.HoveredColumnBorder == -1 and (g.ActiveId == 0 or g.ActiveId == row_id or (table_.IsActiveIdInTable or g.DragDropActive)) then
            highlight_column_n = table_.HoveredColumnBody
        end
    end

    -- Build up request
    local col_header_bg = ImGui.GetColorU32(ImGuiCol.TableHeaderBg)
    local col_text = ImGui.GetColorU32(ImGuiCol.Text)
    for order_n = 0, table_.ColumnsCount - 1 do
        if BitTest(table_.EnabledMaskByDisplayOrder, order_n) then
            local column_n = table_.DisplayOrderToIndex[order_n]
            local column = table_.Columns[column_n]
            if band(column.Flags, ImGuiTableColumnFlags.AngledHeader) ~= 0 then -- Note: can't rely on ImGuiTableColumnFlags_IsVisible test here.
                temp_data.AngledHeadersRequests:push_back({ Index = column_n, TextColor = col_text, BgColor0 = col_header_bg, BgColor1 = (column_n == highlight_column_n) and ImGui.GetColorU32(ImGuiCol.Header) or 0 })
            end
        end
    end

    -- Render row
    ImGui.TableAngledHeadersRowEx(row_id, g.Style.TableAngledHeadersAngle, 0.0, temp_data.AngledHeadersRequests.Data, temp_data.AngledHeadersRequests.Size)
end

local function ImTextCountLines(text, text_begin, text_end)
    local count = 0
    local p = text_begin
    while p < text_end do
        local line_end = string.find(text, "\n", p, true)
        if line_end == nil or line_end >= text_end then p = text_end else p = line_end + 1 end
        count = count + 1
    end
    return count
end

-- Important: data must be fed left to right
--- @param data       ImGuiTableHeaderData[] # 1-based array
--- @param data_count int
function ImGui.TableAngledHeadersRowEx(row_id, angle, max_label_width, data, data_count)
    local g = GImGui
    local table_ = g.CurrentTable
    local window = g.CurrentWindow
    local draw_list = window.DrawList
    IM_ASSERT_USER_ERROR_RET(table_ ~= nil, "Call should only be done while in BeginTable() scope!")
    IM_ASSERT(table_.CurrentRow == -1, "Must be first row")

    if max_label_width == 0.0 then
        max_label_width = ImGui.TableGetHeaderAngledMaxLabelWidth()
    end

    -- Angle argument expressed in (-IM_PI/2 .. +IM_PI/2) as it is easier to think about for user.
    local flip_label = (angle < 0.0)
    angle = angle - IM_PI * 0.5
    local cos_a = ImCos(angle)
    local sin_a = ImSin(angle)
    local label_cos_a = flip_label and ImCos(angle + IM_PI) or cos_a
    local label_sin_a = flip_label and ImSin(angle + IM_PI) or sin_a
    local unit_right = ImVec2(cos_a, sin_a)

    -- Calculate our base metrics and set angled headers data _before_ the first call to TableNextRow()
    local header_height = g.FontSize + g.Style.CellPadding.x * 2.0
    local row_height = ImTrunc(ImAbs(ImRotate(ImVec2(max_label_width, flip_label and header_height or -header_height), cos_a, sin_a).y))
    table_.AngledHeadersHeight = row_height
    table_.AngledHeadersSlope = (sin_a ~= 0.0) and (cos_a / sin_a) or 0.0
    local header_angled_vector = unit_right * (row_height / -sin_a) -- vector from bottom-left to top-left, and from bottom-right to top-right

    -- Declare row, override and draw our own background
    ImGui.TableNextRow(ImGuiTableRowFlags.Headers, row_height)
    ImGui.TableNextColumn()
    local row_r = ImRect(table_.WorkRect.Min.x, table_.BgClipRect.Min.y, table_.WorkRect.Max.x, table_.RowPosY2)
    table_.DrawSplitter:SetCurrentChannel(draw_list, TABLE_DRAW_CHANNEL_BG0)
    local clip_rect_min_x = table_.BgClipRect.Min.x
    if table_.FreezeColumnsCount > 0 then
        clip_rect_min_x = ImMax(clip_rect_min_x, table_.Columns[table_.DisplayOrderToIndex[table_.FreezeColumnsCount - 1]].MaxX)
    end
    ImGui.TableSetBgColor(ImGuiTableBgTarget.RowBg0, 0) -- Cancel
    ImGui.PushClipRect(table_.BgClipRect.Min, table_.BgClipRect.Max, false) -- Span all columns
    draw_list:AddRectFilled(ImVec2(table_.BgClipRect.Min.x, row_r.Min.y), ImVec2(table_.BgClipRect.Max.x, row_r.Max.y), ImGui.GetColorU32(ImGuiCol.TableHeaderBg, 0.25)) -- FIXME-STYLE: Change row background with an arbitrary color.
    ImGui.PushClipRect(ImVec2(clip_rect_min_x, table_.BgClipRect.Min.y), table_.BgClipRect.Max, true) -- Span all columns

    ImGui.ButtonBehavior(row_r, row_id)
    ImGui.KeepAliveID(row_id)

    local ascent_scaled = g.FontBaked.Ascent * g.FontBakedScale -- FIXME: Standardize those scaling factors better
    local line_off_for_ascent_x = (ImMax((g.FontSize - ascent_scaled) * 0.5, 0.0) / -sin_a) * (flip_label and -1.0 or 1.0)
    local padding = g.Style.CellPadding -- We will always use swapped component
    local align = g.Style.TableAngledHeadersTextAlign

    -- Draw background and labels in first pass, then all borders.
    local max_x = -FLT_MAX
    for pass = 0, 1 do
        for order_n = 0, data_count - 1 do
            local request = data[order_n + 1]
            local column_n = request.Index
            local column = table_.Columns[column_n]

            local bg_shape = {}
            bg_shape[0] = ImVec2(column.MaxX, row_r.Max.y)
            bg_shape[1] = ImVec2(column.MinX, row_r.Max.y)
            bg_shape[2] = bg_shape[1] + header_angled_vector
            bg_shape[3] = bg_shape[0] + header_angled_vector
            if pass == 0 then
                -- Draw shape
                draw_list:AddQuadFilled(bg_shape[0], bg_shape[1], bg_shape[2], bg_shape[3], request.BgColor0)
                draw_list:AddQuadFilled(bg_shape[0], bg_shape[1], bg_shape[2], bg_shape[3], request.BgColor1) -- Optional highlight
                max_x = ImMax(max_x, bg_shape[3].x)

                -- Draw label
                local label_name = ImGui.TableGetColumnName(table_, column_n)
                local label_name_end = ImGui.FindRenderedTextEnd(label_name)
                local line_off_step_x = (g.FontSize / -sin_a)
                local label_lines = ImTextCountLines(label_name, 1, label_name_end)

                -- Left<>Right alignment
                local line_off_curr_x = flip_label and ((label_lines - 1) * line_off_step_x) or 0.0
                local line_off_for_align_x = ImFloor(ImMax((((column.MaxX - column.MinX) - padding.x * 2.0) - (label_lines * line_off_step_x)), 0.0) * align.x)
                line_off_curr_x = line_off_curr_x + line_off_for_align_x - line_off_for_ascent_x

                -- Register header width
                local w = column.WorkMinX + ImCeil(label_lines * line_off_step_x - line_off_for_align_x)
                column.ContentMaxXHeadersUsed = w; column.ContentMaxXHeadersIdeal = w

                local p = 1
                while p < label_name_end do
                    local label_name_eol = string.find(label_name, "\n", p, true)
                    if label_name_eol == nil or label_name_eol > label_name_end then
                        label_name_eol = label_name_end
                    end
                    local line = string.sub(label_name, p, label_name_eol - 1)

                    -- FIXME: Individual line clipping for right-most column is broken for negative angles.
                    local label_size = ImGui.CalcTextSize(line)
                    local clip_width = max_label_width - padding.y -- Using padding.y*2.0f would be symmetrical but hide more text.
                    local clip_height = ImMin(label_size.y, column.ClipRect.Max.x - column.WorkMinX - line_off_curr_x)
                    local clip_r = ImRect(window.ClipRect.Min, window.ClipRect.Min + ImVec2(clip_width, clip_height))
                    local vtx_idx_begin = draw_list._VtxCurrentIdx
                    ImGui.PushStyleColor(ImGuiCol.Text, request.TextColor)
                    ImGui.RenderTextEllipsis(draw_list, clip_r.Min, clip_r.Max, clip_r.Max.x, line, #line + 1, label_size)
                    ImGui.PopStyleColor()
                    local vtx_idx_end = draw_list._VtxCurrentIdx

                    -- Up<>Down alignment
                    local available_space = ImMax(clip_width - label_size.x + ImAbs(padding.x * cos_a) * 2.0 - ImAbs(padding.y * sin_a) * 2.0, 0.0)
                    local vertical_offset = available_space * align.y * (flip_label and -1.0 or 1.0)

                    -- Rotate and offset label
                    local pivot_in = ImVec2(window.ClipRect.Min.x - vertical_offset, window.ClipRect.Min.y + label_size.y)
                    local pivot_out = ImVec2(column.WorkMinX, row_r.Max.y)
                    line_off_curr_x = line_off_curr_x + (flip_label and -line_off_step_x or line_off_step_x)
                    pivot_out = pivot_out + unit_right * padding.y
                    if flip_label then
                        pivot_out = pivot_out + unit_right * (clip_width - ImMax(0.0, clip_width - label_size.x))
                    end
                    pivot_out.x = pivot_out.x + (flip_label and (line_off_curr_x + line_off_step_x) or line_off_curr_x)
                    ImGui.ShadeVertsTransformPos(draw_list, vtx_idx_begin, vtx_idx_end, pivot_in, label_cos_a, label_sin_a, pivot_out) -- Rotate and offset

                    p = label_name_eol + 1
                end
            end
            if pass == 1 then
                -- Draw border
                local border_size = TABLE_BORDER_SIZE
                draw_list:AddLine(bg_shape[0] + ImVec2(border_size * 0.5, 0.0), bg_shape[3] + ImVec2(border_size * 0.5, 0.0), TableGetColumnBorderCol(table_, order_n, column_n), border_size)
            end
        end
    end
    ImGui.PopClipRect()
    ImGui.PopClipRect()
    table_.TempData.AngledHeadersExtraWidth = ImMax(0.0, max_x - table_.Columns[table_.RightMostEnabledColumn].MaxX)
end

----------------------------------------------------------------
-- [SECTION] Tables: Context Menu
----------------------------------------------------------------

-- Use -1 to open menu not specific to a given column.
function ImGui.TableOpenContextMenu(column_n)
    if column_n == nil then column_n = -1 end
    local g = GImGui
    local table_ = g.CurrentTable
    if column_n == -1 and table_.CurrentColumn ~= -1 then -- When called within a column automatically use this one (for consistency)
        column_n = table_.CurrentColumn
    end
    if column_n == table_.ColumnsCount then -- To facilitate using with TableGetHoveredColumn()
        column_n = -1
    end
    IM_ASSERT(column_n >= -1 and column_n < table_.ColumnsCount)
    if band(table_.Flags, bor(ImGuiTableFlags.Resizable, ImGuiTableFlags.Reorderable, ImGuiTableFlags.Hideable)) ~= 0 then
        table_.IsContextPopupOpen = true
        table_.ContextPopupColumn = column_n
        table_.InstanceInteracted = table_.InstanceCurrent
        local context_menu_id = ImHashStr("##ContextMenu", nil, table_.ID)
        ImGui.OpenPopupEx(context_menu_id, ImGuiPopupFlags.None)
    end
end

function ImGui.TableBeginContextMenuPopup(table_)
    if not table_.IsContextPopupOpen or table_.InstanceCurrent ~= table_.InstanceInteracted then
        return false
    end
    local context_menu_id = ImHashStr("##ContextMenu", nil, table_.ID)
    if ImGui.BeginPopupEx(context_menu_id, bor(ImGuiWindowFlags.AlwaysAutoResize, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoSavedSettings)) then
        return true
    end
    table_.IsContextPopupOpen = false
    return false
end

-- FIXME: Copied from MenuItem() for the purpose of being able to pass _SelectOnRelease (#9312)
local function MenuItemForColumnReorder(label, selected, enabled)
    local g = GImGui
    local window = g.CurrentWindow

    local label_size = ImGui.CalcTextSize(label, nil, true)
    local offsets = window.DC.MenuColumns
    local checkmark_w = IM_TRUNC(g.FontSize * 1.20)
    local min_w = offsets:DeclColumns(0.0, label_size.x, 0.0, checkmark_w) -- Feedback for next frame
    local stretch_w = ImMax(0.0, ImGui.GetContentRegionAvail().x - min_w)
    local text_pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y + window.DC.CurrLineTextBaseOffset)

    local id = ImGui.GetID(label)
    local selectable_flags = bor(ImGuiSelectableFlags.SelectOnRelease, ImGuiSelectableFlags.SpanAvailWidth)
    if g.ActiveId == id then
        selectable_flags = bor(selectable_flags, ImGuiSelectableFlags.Highlight) -- Stays highlighted while dragging.
    end
    local has_been_moved = (g.ActiveId == id) and g.ActiveIdHasBeenEditedBefore -- But disable toggling once moved.

    ImGui.BeginDisabled(not enabled) -- Don't use ImGuiSelectableFlags_Disabled so that Check mark is also affected.
    local ret = ImGui.Selectable(label, false, selectable_flags, ImVec2(min_w, label_size.y)) and not has_been_moved
    if band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Visible) ~= 0 and selected then
        ImGui.RenderCheckMark(window.DrawList, text_pos + ImVec2(offsets.OffsetMark + stretch_w + g.FontSize * 0.40, g.FontSize * 0.134 * 0.5), ImGui.GetColorU32(ImGuiCol.Text), g.FontSize * 0.866)
    end
    ImGui.EndDisabled()

    return ret
end

-- Output context menu into current window (generally a popup)
function ImGui.TableDrawDefaultContextMenu(table_, flags_for_section_to_display)
    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then
        return
    end

    local want_separator = false
    local context_column_n = (table_.ContextPopupColumn >= 0 and table_.ContextPopupColumn < table_.ColumnsCount) and table_.ContextPopupColumn or -1
    local context_column = (context_column_n ~= -1) and table_.Columns[context_column_n] or nil

    -- Sizing
    if band(flags_for_section_to_display, ImGuiTableFlags.Resizable) ~= 0 then
        if context_column ~= nil then
            local can_resize = band(context_column.Flags, ImGuiTableColumnFlags.NoResize) == 0 and context_column.IsEnabled
            if ImGui.MenuItem(ImGui.LocalizeGetMsg(ImGuiLocKey.TableSizeOne), nil, false, can_resize) then -- "###SizeOne"
                ImGui.TableSetColumnWidthAutoSingle(table_, context_column_n)
            end
        end

        local size_all_desc
        if table_.ColumnsEnabledFixedCount == table_.ColumnsEnabledCount and band(table_.Flags, ImGuiTableFlags.SizingMask_) ~= ImGuiTableFlags.SizingFixedSame then
            size_all_desc = ImGui.LocalizeGetMsg(ImGuiLocKey.TableSizeAllFit)        -- "###SizeAll" All fixed
        else
            size_all_desc = ImGui.LocalizeGetMsg(ImGuiLocKey.TableSizeAllDefault)    -- "###SizeAll" All stretch or mixed
        end
        if ImGui.MenuItem(size_all_desc, nil) then
            ImGui.TableSetColumnWidthAutoAll(table_)
        end
        want_separator = true
    end

    -- Reset Order/Visibility etc.
    if band(flags_for_section_to_display, bor(ImGuiTableFlags.Reorderable, ImGuiTableFlags.Hideable)) ~= 0 then
        if ImGui.BeginMenu(ImGui.LocalizeGetMsg(ImGuiLocKey.TableReset)) then
            if band(flags_for_section_to_display, ImGuiTableFlags.Reorderable) ~= 0 then
                if ImGui.MenuItem(ImGui.LocalizeGetMsg(ImGuiLocKey.TableResetOrder), nil, false, not table_.IsDefaultDisplayOrder) then -- PS: cannot be hidden because it would mess with drag reordering.
                    table_.IsResetDisplayOrderRequest = true
                end
            end
            if band(flags_for_section_to_display, ImGuiTableFlags.Hideable) ~= 0 then
                if ImGui.MenuItem(ImGui.LocalizeGetMsg(ImGuiLocKey.TableResetVisibility), nil, false, not table_.IsDefaultVisibility) then
                    table_.IsResetVisibilityRequest = true
                end
            end
            ImGui.EndMenu()
        end
    end

    -- Hiding / Visibility
    if band(flags_for_section_to_display, ImGuiTableFlags.Hideable) ~= 0 then
        if want_separator then
            ImGui.Separator()
        end
        want_separator = true

        -- While reordering: we calculate min/max allowed range once here so we can avoid a O(N log N) in the loop.
        local is_reordering = (g.ActiveId ~= 0 and g.ActiveIdWindow == g.CurrentWindow and table_.ReorderColumn ~= -1 and g.ActiveIdHasBeenEditedBefore) -- FIXME: This is a bit of a hack.
        local reorder_src_order = is_reordering and table_.Columns[table_.ReorderColumn].DisplayOrder or -1
        local reorder_min_order = is_reordering and TableGetMaxDisplayOrderAllowed(table_, reorder_src_order, 0) or 0
        local reorder_max_order = is_reordering and TableGetMaxDisplayOrderAllowed(table_, reorder_src_order, table_.ColumnsCount - 1) or (table_.ColumnsCount - 1)
        ImGui.PushItemFlag(ImGuiItemFlags.AutoClosePopups, false)
        for order_n = 0, table_.ColumnsCount - 1 do
            local column_n = table_.DisplayOrderToIndex[order_n]
            local column = table_.Columns[column_n]
            if band(column.Flags, ImGuiTableColumnFlags.Disabled) == 0 then
                local name = ImGui.TableGetColumnName(table_, column_n)
                if name == nil or name == "" then
                    name = "<Unknown>"
                end

                -- Make sure we can't hide the last active column
                local menu_item_enabled = band(column.Flags, ImGuiTableColumnFlags.NoHide) == 0
                if column.IsUserEnabled and table_.ColumnsEnabledCount <= 1 then
                    menu_item_enabled = false
                end
                if is_reordering and (column.DisplayOrder < reorder_min_order or column.DisplayOrder > reorder_max_order) then
                    menu_item_enabled = false
                end
                if MenuItemForColumnReorder(name, column.IsUserEnabled, menu_item_enabled) then
                    column.IsUserEnabledNextFrame = not column.IsUserEnabled
                end

                -- Drag to reorder
                if ImGui.IsItemActive() and ImGui.IsMouseDragging(0) and g.ActiveIdSource == ImGuiInputSource.Mouse and band(table_.Flags, ImGuiTableFlags.Reorderable) ~= 0 then
                    g.ActiveIdHasBeenEditedBefore = true -- Disable toggle in MenuItemForColumnReorder() + start dimming to display allowed reorder targets.
                    table_.ReorderColumn = column_n
                    if not ImGui.IsItemHovered() then
                        local reorder_dir = (g.IO.MousePos.y < (g.LastItemData.Rect.Min.y + g.LastItemData.Rect.Max.y) * 0.5) and -1 or 1
                        local reorder_amount = ((reorder_dir < 0) and (g.LastItemData.Rect.Min.y - g.IO.MousePos.y) or (g.IO.MousePos.y - g.LastItemData.Rect.Max.y)) / g.LastItemData.Rect:GetHeight()
                        local dst_order = column.DisplayOrder + ImTrunc(ImCeil(reorder_amount)) * reorder_dir -- Estimated target order, will be validated and clamped.
                        ImGui.TableQueueSetColumnDisplayOrder(table_, column_n, dst_order)
                    end
                end
            end
        end
        ImGui.PopItemFlag()
    end
end

----------------------------------------------------------------
-- [SECTION] Tables: Settings (.ini data)
----------------------------------------------------------------

-- Clear and initialize empty settings instance
local function TableSettingsInit(settings, id, columns_count, columns_count_max)
    for k, v in pairs(ImGuiTableSettings()) do settings[k] = v end
    for n = 0, columns_count_max - 1 do
        settings.Columns[n] = ImGuiTableColumnSettings()
    end
    settings.ID = id
    settings.ColumnsCount = columns_count
    settings.ColumnsCountMax = columns_count_max
    settings.WantApply = true
end

function ImGui.TableSettingsCreate(id, columns_count)
    local g = GImGui
    local settings = ImGui.TableSettingsFindByID(id)
    if settings then
        if settings.ColumnsCountMax >= columns_count then
            TableSettingsInit(settings, id, columns_count, settings.ColumnsCountMax) -- Recycle
            return settings
        end
        settings.ID = 0 -- Invalidate storage, we won't fit because of a count change
    end
    settings = ImGuiTableSettings()
    g.SettingsTables:push_back(settings)
    TableSettingsInit(settings, id, columns_count, columns_count)
    return settings
end

-- Find existing settings
function ImGui.TableSettingsFindByID(id)
    local g = GImGui
    for _, settings in g.SettingsTables:iter() do
        if settings.ID == id then
            return settings
        end
    end
    return nil
end

local function SettingsTablesOffsetFromPtr(settings)
    local g = GImGui
    return g.SettingsTables:find_index(settings) or -1
end

-- Get settings for a given table, NULL if none
function ImGui.TableGetBoundSettings(table_)
    if table_.SettingsOffset == -1 then
        return nil
    end
    local g = GImGui
    local settings = g.SettingsTables.Data[table_.SettingsOffset]
    IM_ASSERT(settings.ID == table_.ID)
    return settings
end

-- Restore initial state of table (with or without saved settings)
function ImGui.TableResetSettings(table_)
    table_.IsInitializing = true; table_.IsSettingsDirty = true
    table_.IsResetAllRequest = false
    table_.IsSettingsRequestLoad = false                    -- Don't reload from ini
    table_.SettingsLoadedFlags = ImGuiTableFlags.None       -- Mark as nothing loaded so our initialized data becomes authoritative
end

function ImGui.TableSaveSettings(table_)
    table_.IsSettingsDirty = false
    if band(table_.Flags, ImGuiTableFlags.NoSavedSettings) ~= 0 then
        return
    end

    -- Bind or create settings data
    local settings = ImGui.TableGetBoundSettings(table_)
    if settings ~= nil and table_.ColumnsCount > settings.ColumnsCountMax then
        settings.ID = 0 -- Invalidate storage, we won't fit because of a count change
        settings = nil
    end
    if settings == nil then
        settings = ImGui.TableSettingsCreate(table_.ID, table_.ColumnsCount)
        table_.SettingsOffset = SettingsTablesOffsetFromPtr(settings)
    end
    settings.ColumnsCount = table_.ColumnsCount

    -- Serialize ImGuiTable/ImGuiTableColumn into ImGuiTableSettings/ImGuiTableColumnSettings
    IM_ASSERT(settings.ID == table_.ID)
    IM_ASSERT(settings.ColumnsCount == table_.ColumnsCount and settings.ColumnsCountMax >= settings.ColumnsCount)

    local save_ref_scale = false
    settings.SaveFlags = ImGuiTableFlags.None
    for n = 0, table_.ColumnsCount - 1 do
        local column = table_.Columns[n]
        local column_settings = settings.Columns[n]
        local width_or_weight = (band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0) and column.StretchWeight or column.WidthRequest
        column_settings.ID = column.ID
        column_settings.WidthOrWeight = width_or_weight
        column_settings.Index = n
        column_settings.DisplayOrder = column.DisplayOrder
        column_settings.SortOrder = column.SortOrder
        column_settings.SortDirection = column.SortDirection
        column_settings.IsEnabled = column.IsUserEnabled and 1 or 0
        column_settings.IsStretch = (band(column.Flags, ImGuiTableColumnFlags.WidthStretch) ~= 0) and 1 or 0
        if band(column.Flags, ImGuiTableColumnFlags.WidthStretch) == 0 then
            save_ref_scale = true
        end

        -- We skip saving some data in the .ini file when they are unnecessary to restore our state.
        if width_or_weight ~= column.InitStretchWeightOrWidth then
            settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Resizable)
        end
        if column.DisplayOrder ~= n then
            settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Reorderable)
        end
        if column.SortOrder ~= -1 then
            settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Sortable, ImGuiTableFlags.Reorderable) -- Because SortOrder saving itself is gated, make sure every column is saved (#9519)
        end
        if column.IsUserEnabled ~= (band(column.Flags, ImGuiTableColumnFlags.DefaultHide) == 0) then
            settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Hideable)
        end
    end
    settings.SaveFlags = band(settings.SaveFlags, table_.Flags)
    settings.RefScale = save_ref_scale and table_.RefScale or 0.0

    ImGui.MarkIniSettingsDirty()
end

function ImGui.TableLoadSettings(table_)
    if band(table_.Flags, ImGuiTableFlags.NoSavedSettings) ~= 0 then
        table_.IsSettingsRequestLoad = false -- Done
        return
    end

    -- Bind settings
    local settings
    if table_.SettingsOffset == -1 then
        settings = ImGui.TableSettingsFindByID(table_.ID)
        if settings == nil then
            return
        end
        if settings.ColumnsCount ~= table_.ColumnsCount then -- Allow settings if columns count changed. We could otherwise decide to return...
            table_.IsSettingsDirty = true
        end
        table_.SettingsOffset = SettingsTablesOffsetFromPtr(settings)
    else
        settings = ImGui.TableGetBoundSettings(table_)
    end

    table_.SettingsLoadedFlags = settings.SaveFlags
    table_.RefScale = settings.RefScale
    -- TableUpdateLayout() will then call TableLoadSettingsForColumns() to apply the data.
end

-- NB: This was written to be similar to the logic in TableReconcileColumns().
function ImGui.TableLoadSettingsForColumns(table_)
    for n = 0, table_.ColumnsSize - 1 do
        table_.Columns[n].IsLoadedSettings = false
    end
    local settings = ImGui.TableGetBoundSettings(table_)
    if settings == nil then
        return
    end

    table_.SettingsLoadedFlags = bor(table_.SettingsLoadedFlags, ImGuiTableFlags.Reorderable) -- We handle above in code above.

    -- Serialize ImGuiTableSettings/ImGuiTableColumnSettings into ImGuiTable/ImGuiTableColumn
    local column_settings = settings.Columns

    -- Fast path
    local matches = 0
    for n = 0, table_.ColumnsCount - 1 do
        if n >= settings.ColumnsCount or column_settings[n].ID ~= table_.Columns[n].ID then
            break
        end
        ImGui.TableLoadSettingsForColumn(table_.Columns[n], column_settings[n], settings.SaveFlags)
        matches = matches + 1
    end
    if matches == settings.ColumnsCount then
        return
    end
    local settings_start_n = matches -- Small optimization
    for n = settings_start_n, settings.ColumnsCount - 1 do
        column_settings[n].IsLoaded = false
    end

    -- Find matches for named columns
    for c = 0, table_.ColumnsSize - 1 do
        local column = table_.Columns[c]
        if column.ID ~= 0 and not column.IsLoadedSettings then
            for n = settings_start_n, settings.ColumnsCount - 1 do
                if column_settings[n].ID == column.ID and not column_settings[n].IsLoaded then
                    ImGui.TableLoadSettingsForColumn(column, column_settings[n], settings.SaveFlags)
                    matches = matches + 1
                    break
                end
            end
        end
    end

    -- Remaining entries are matched sequentially
    local dst_idx = 0
    for n = settings_start_n, settings.ColumnsCount - 1 do
        if not column_settings[n].IsLoaded then
            while dst_idx < table_.ColumnsCount and table_.Columns[dst_idx].IsLoadedSettings do
                dst_idx = dst_idx + 1
            end
            if dst_idx >= table_.ColumnsCount then
                break
            end
            ImGui.TableLoadSettingsForColumn(table_.Columns[dst_idx], column_settings[n], settings.SaveFlags)
            dst_idx = dst_idx + 1
        end
    end
end

function ImGui.TableLoadSettingsForColumn(column, column_settings, load_flags)
    column.IsLoadedSettings = true
    column_settings.IsLoaded = true
    if band(load_flags, ImGuiTableFlags.Resizable) ~= 0 then
        if column_settings.IsStretch ~= 0 then
            column.StretchWeight = column_settings.WidthOrWeight
        else
            column.WidthRequest = column_settings.WidthOrWeight
        end
        column.AutoFitQueue = 0x00
    end
    if band(load_flags, ImGuiTableFlags.Reorderable) ~= 0 then
        column.DisplayOrder = column_settings.DisplayOrder
    else
        column.DisplayOrder = column_settings.Index -- Because default depends on previous Index, we need to set that up and cannot rely on TableInitColumnDefaults()
    end
    if band(load_flags, ImGuiTableFlags.Hideable) ~= 0 and column_settings.IsEnabled ~= -1 then
        local v = (column_settings.IsEnabled == 1)
        column.IsUserEnabled = v; column.IsUserEnabledNextFrame = v
    end
    column.SortOrder = column_settings.SortOrder
    column.SortDirection = column_settings.SortDirection
end

-- Fix invalid display order data: compact values (0,1,3 -> 0,1,2); preserve relative order (0,3,1 -> 0,2,1); deduplicate (0,4,1,1 -> 0,3,1,2)
function ImGui.TableFixDisplayOrder(table_)
    if band(table_.Flags, ImGuiTableFlags.Reorderable) == 0 then
        for n = 0, table_.ColumnsCount - 1 do
            table_.Columns[n].DisplayOrder = n
            table_.DisplayOrderToIndex[n] = n
        end
        return
    end
    local fdo_columns = {}
    for n = 0, table_.ColumnsCount - 1 do
        fdo_columns[n + 1] = n
    end
    -- Sort by DisplayOrder and then Index. -1 (unsigned short 0xFFFF) always sorts after.
    local function key(idx)
        local o = table_.Columns[idx].DisplayOrder
        if o < 0 then o = o + 0x10000 end
        return o
    end
    table.sort(fdo_columns, function(lhs_idx, rhs_idx)
        local a, b = key(lhs_idx), key(rhs_idx)
        if a ~= b then return a < b end
        return lhs_idx < rhs_idx
    end)
    for n = 0, table_.ColumnsCount - 1 do
        table_.Columns[fdo_columns[n + 1]].DisplayOrder = n
    end
    for n = 0, table_.ColumnsCount - 1 do
        table_.DisplayOrderToIndex[table_.Columns[n].DisplayOrder] = n
    end
end

local function ForEachTable(g, fn)
    for i = 0, g.Tables:GetMapSize() - 1 do
        local t = g.Tables:GetByIndex(i)
        if t then fn(t) end
    end
end

local function TableSettingsHandler_ClearAll(ctx, handler)
    local g = ctx
    ForEachTable(g, function(t) t.SettingsOffset = -1 end)
    g.SettingsTables:clear()
end

-- Apply to existing windows (if any)
local function TableSettingsHandler_ApplyAll(ctx, handler)
    local g = ctx
    ForEachTable(g, function(t)
        t.IsSettingsRequestLoad = true
        t.SettingsOffset = -1
    end)
end

local function TableSettingsHandler_ReadOpen(ctx, handler, name)
    local id, columns_count = string.match(name, "^0x(%x+),(%-?%d+)")
    if id == nil then
        return nil
    end
    id = tonumber(id, 16); columns_count = tonumber(columns_count)
    if columns_count <= 0 or columns_count >= IMGUI_TABLE_MAX_COLUMNS then
        return nil
    end
    return ImGui.TableSettingsCreate(id, columns_count)
end

local function TableSettingsHandler_ReadLine(ctx, handler, settings, line)
    -- "Column 0  UserID=0x42AD2D21 Width=100 Visible=1 Order=0 Sort=0v"
    if settings == nil then return end
    local f = string.match(line, "^RefScale=([%-%d%.eE+]+)")
    if f then settings.RefScale = tonumber(f); return end
    local n = string.match(line, "^LastUsed=(%d+)")
    if n then settings.LastUsedDate = tonumber(n); return end

    local column_n, rest = string.match(line, "^Column (%-?%d+)(.*)$")
    if column_n then
        column_n = tonumber(column_n)
        if column_n < 0 or column_n >= settings.ColumnsCount then
            return
        end
        local column = settings.Columns[column_n]
        column.Index = column_n
        local function take(pattern)
            local a, b, r = string.match(rest, "^%s*" .. pattern .. "()")
            if a == nil then return nil end
            if r == nil then r = b; b = nil end
            rest = string.sub(rest, r)
            return a, b
        end
        take("UserID=0x(%x+)") -- FIXME-LEGACY: Removed 2025/11/12, was never properly set.
        local v = take("Width=(%-?%d+)")
        if v then column.WidthOrWeight = tonumber(v); column.IsStretch = 0; settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Resizable) end
        v = take("Weight=([%-%d%.eE+]+)")
        if v then column.WidthOrWeight = tonumber(v); column.IsStretch = 1; settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Resizable) end
        v = take("Visible=(%-?%d+)")
        if v then column.IsEnabled = tonumber(v); settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Hideable) end
        v = take("Order=(%-?%d+)")
        if v then column.DisplayOrder = tonumber(v); settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Reorderable) end
        local c
        v, c = take("Sort=(%-?%d+)(.)")
        if v then column.SortOrder = tonumber(v); column.SortDirection = (c == "^") and ImGuiSortDirection.Descending or ImGuiSortDirection.Ascending; settings.SaveFlags = bor(settings.SaveFlags, ImGuiTableFlags.Sortable) end
        v = take("ID=0x(%x+)")
        if v then column.ID = tonumber(v, 16) end
    end
end

local function TableSettingsHandler_WriteAll(ctx, handler, buf)
    local g = ctx
    for _, settings in g.SettingsTables:iter() do
        if settings.ID ~= 0 then -- Skip ditched settings
            local save_size    = band(settings.SaveFlags, ImGuiTableFlags.Resizable) ~= 0
            local save_visible = band(settings.SaveFlags, ImGuiTableFlags.Hideable) ~= 0
            local save_order   = band(settings.SaveFlags, ImGuiTableFlags.Reorderable) ~= 0
            local save_sort    = band(settings.SaveFlags, ImGuiTableFlags.Sortable) ~= 0
            -- We need to save the [Table] entry even if all the bools are false, since this records a table with "default settings".

            buf:appendf("[%s][0x%08X,%d]\n", handler.TypeName, settings.ID, settings.ColumnsCount)
            if settings.RefScale ~= 0.0 then
                buf:appendf("RefScale=%g\n", settings.RefScale)
            end
            for column_n = 0, settings.ColumnsCount - 1 do
                local column = settings.Columns[column_n]
                local save_column = save_size or save_visible or save_order or (save_sort and column.SortOrder ~= -1)
                if save_column then
                    buf:appendf("Column %-2d", column_n)
                    if save_size and column.IsStretch ~= 0 then buf:appendf(" Weight=%.4f", column.WidthOrWeight) end
                    if save_size and column.IsStretch == 0 then buf:appendf(" Width=%d", ImTrunc(column.WidthOrWeight)) end
                    if save_visible then buf:appendf(" Visible=%d", column.IsEnabled) end
                    if save_order then buf:appendf(" Order=%d", column.DisplayOrder) end
                    if save_sort and column.SortOrder ~= -1 then buf:appendf(" Sort=%d%s", column.SortOrder, (column.SortDirection == ImGuiSortDirection.Ascending) and "v" or "^") end
                    if column.ID ~= 0 then buf:appendf(" ID=0x%08X", column.ID) end
                    buf:append("\n")
                end
            end
            if g.IO.ConfigIniSettingsSaveLastUsedDate and settings.LastUsedDate ~= 0 then
                buf:appendf("LastUsed=%08d\n", settings.LastUsedDate)
            end
            buf:append("\n")
        end
    end
end

function ImGui.TableSettingsAddSettingsHandler()
    local ini_handler = ImGuiSettingsHandler()
    ini_handler.TypeName = "Table"
    ini_handler.TypeHash = ImHashStr("Table")
    ini_handler.ClearAllFn = TableSettingsHandler_ClearAll
    ini_handler.ReadOpenFn = TableSettingsHandler_ReadOpen
    ini_handler.ReadLineFn = TableSettingsHandler_ReadLine
    ini_handler.ApplyAllFn = TableSettingsHandler_ApplyAll
    ini_handler.WriteAllFn = TableSettingsHandler_WriteAll
    ImGui.AddSettingsHandler(ini_handler)
end

----------------------------------------------------------------
-- [SECTION] Tables: Garbage Collection
----------------------------------------------------------------

-- Remove Table data (currently only used by TestEngine)
function ImGui.TableRemove(table_)
    local g = GImGui
    local table_idx = g.Tables:GetIndex(table_)
    g.Tables:Remove(table_.ID, table_)
    g.TablesLastTimeActive.Data[table_idx + 1] = -1.0
end

-- Free up/compact internal Table buffers for when it gets unused
-- Overloads: (ImGuiTable) / (ImGuiTableTempData)
function ImGui.TableGcCompactTransientBuffers(t)
    if not t then return end
    if t.TableIndex ~= nil then -- ImGuiTableTempData
        t.AngledHeadersRequests:clear()
        t.DrawSplitter:ClearFreeMemory()
        t.LastTimeActive = -1.0
        return
    end
    local g = GImGui
    local table_ = t
    IM_ASSERT(table_.MemoryCompacted == false)
    table_.SortSpecs.Specs = nil
    table.clear(table_.SortSpecsMulti)
    table_.IsSortSpecsDirty = true -- FIXME: In theory shouldn't have to leak into user performing a sort on resume.
    table.clear(table_.ColumnsNames)
    table_.MemoryCompacted = true
    for n = 0, table_.ColumnsCount - 1 do
        table_.Columns[n].NameOffset = -1
    end
    g.TablesLastTimeActive.Data[g.Tables:GetIndex(table_) + 1] = -1.0
end

-- Compact and remove unused or resize settings data
function ImGui.TableGcCompactSettings()
    local g = GImGui
    local has_dead = false
    for _, settings in g.SettingsTables:iter() do
        if settings.ID == 0 then has_dead = true end
    end
    if not has_dead then
        return
    end
    local new_list = ImVector()
    for _, settings in g.SettingsTables:iter() do
        if settings.ID ~= 0 then new_list:push_back(settings) end
    end
    g.SettingsTables = new_list
    ForEachTable(g, function(t) t.SettingsOffset = -1 end)
end

----------------------------------------------------------------
-- [SECTION] Columns, BeginColumns, EndColumns, etc.
-- (This is a legacy API, prefer using BeginTable/EndTable!)
----------------------------------------------------------------
-- (Lua: columns.Columns is an ImVector, column n lives in .Data[n + 1])

function ImGui.GetColumnIndex()
    local window = ImGui.GetCurrentWindowRead()
    return window.DC.CurrentColumns and window.DC.CurrentColumns.Current or 0
end

function ImGui.GetColumnsCount()
    local window = ImGui.GetCurrentWindowRead()
    return window.DC.CurrentColumns and window.DC.CurrentColumns.Count or 1
end

function ImGui.GetColumnOffsetFromNorm(columns, offset_norm)
    return offset_norm * (columns.OffMaxX - columns.OffMinX)
end

function ImGui.GetColumnNormFromOffset(columns, offset)
    return offset / (columns.OffMaxX - columns.OffMinX)
end

local COLUMNS_HIT_RECT_HALF_THICKNESS = 4.0

local function GetDraggedColumnOffset(columns, column_index)
    -- Active (dragged) column always follow mouse.
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT(column_index > 0) -- We are not supposed to drag column 0.
    IM_ASSERT(g.ActiveId == band(columns.ID + column_index, 0xFFFFFFFF))

    local x = g.IO.MousePos.x - g.ActiveIdClickOffset.x + ImTrunc(COLUMNS_HIT_RECT_HALF_THICKNESS * g.CurrentDpiScale) - window.Pos.x
    x = ImMax(x, ImGui.GetColumnOffset(column_index - 1) + g.Style.ColumnsMinSpacing)
    if band(columns.Flags, ImGuiOldColumnFlags.NoPreserveWidths) ~= 0 then
        x = ImMin(x, ImGui.GetColumnOffset(column_index + 1) - g.Style.ColumnsMinSpacing)
    end

    return x
end

function ImGui.GetColumnOffset(column_index)
    if column_index == nil then column_index = -1 end
    local window = ImGui.GetCurrentWindowRead()
    local columns = window.DC.CurrentColumns
    if columns == nil then
        return 0.0
    end

    if column_index < 0 then
        column_index = columns.Current
    end
    IM_ASSERT(column_index < columns.Columns.Size)

    local t = columns.Columns.Data[column_index + 1].OffsetNorm
    local x_offset = ImLerp(columns.OffMinX, columns.OffMaxX, t)
    return x_offset
end

local function GetColumnWidthEx(columns, column_index, before_resize)
    if column_index < 0 then
        column_index = columns.Current
    end

    local d = columns.Columns.Data
    local offset_norm
    if before_resize then
        offset_norm = d[column_index + 2].OffsetNormBeforeResize - d[column_index + 1].OffsetNormBeforeResize
    else
        offset_norm = d[column_index + 2].OffsetNorm - d[column_index + 1].OffsetNorm
    end
    return ImGui.GetColumnOffsetFromNorm(columns, offset_norm)
end

function ImGui.GetColumnWidth(column_index)
    if column_index == nil then column_index = -1 end
    local g = GImGui
    local window = g.CurrentWindow
    local columns = window.DC.CurrentColumns
    if columns == nil then
        return ImGui.GetContentRegionAvail().x
    end

    if column_index < 0 then
        column_index = columns.Current
    end
    local d = columns.Columns.Data
    return ImGui.GetColumnOffsetFromNorm(columns, d[column_index + 2].OffsetNorm - d[column_index + 1].OffsetNorm)
end

function ImGui.SetColumnOffset(column_index, offset)
    local g = GImGui
    local window = g.CurrentWindow
    local columns = window.DC.CurrentColumns
    IM_ASSERT(columns ~= nil)

    if column_index < 0 then
        column_index = columns.Current
    end
    IM_ASSERT(column_index < columns.Columns.Size)

    local preserve_width = band(columns.Flags, ImGuiOldColumnFlags.NoPreserveWidths) == 0 and (column_index < columns.Count - 1)
    local width = preserve_width and GetColumnWidthEx(columns, column_index, columns.IsBeingResized) or 0.0

    if band(columns.Flags, ImGuiOldColumnFlags.NoForceWithinWindow) == 0 then
        offset = ImMin(offset, columns.OffMaxX - g.Style.ColumnsMinSpacing * (columns.Count - column_index))
    end
    columns.Columns.Data[column_index + 1].OffsetNorm = ImGui.GetColumnNormFromOffset(columns, offset - columns.OffMinX)

    if preserve_width then
        ImGui.SetColumnOffset(column_index + 1, offset + ImMax(g.Style.ColumnsMinSpacing, width))
    end
end

function ImGui.SetColumnWidth(column_index, width)
    local window = ImGui.GetCurrentWindowRead()
    local columns = window.DC.CurrentColumns
    IM_ASSERT(columns ~= nil)

    if column_index < 0 then
        column_index = columns.Current
    end
    ImGui.SetColumnOffset(column_index + 1, ImGui.GetColumnOffset(column_index) + width)
end

function ImGui.PushColumnClipRect(column_index)
    local window = ImGui.GetCurrentWindowRead()
    local columns = window.DC.CurrentColumns
    if column_index < 0 then
        column_index = columns.Current
    end

    local column = columns.Columns.Data[column_index + 1]
    ImGui.PushClipRect(column.ClipRect.Min, column.ClipRect.Max, false)
end

-- Get into the columns background draw command (which is generally the same draw command as before we called BeginColumns)
function ImGui.PushColumnsBackground()
    local window = ImGui.GetCurrentWindowRead()
    local columns = window.DC.CurrentColumns
    if columns.Count == 1 then
        return
    end

    -- Optimization: avoid SetCurrentChannel() + PushClipRect()
    ImRect_Copy(columns.HostBackupClipRect, window.ClipRect)
    ImGui.SetWindowClipRectBeforeSetChannel(window, columns.HostInitialClipRect)
    columns.Splitter:SetCurrentChannel(window.DrawList, 0)
end

function ImGui.PopColumnsBackground()
    local window = ImGui.GetCurrentWindowRead()
    local columns = window.DC.CurrentColumns
    if columns.Count == 1 then
        return
    end

    -- Optimization: avoid PopClipRect() + SetCurrentChannel()
    ImGui.SetWindowClipRectBeforeSetChannel(window, columns.HostBackupClipRect)
    columns.Splitter:SetCurrentChannel(window.DrawList, columns.Current + 1)
end

function ImGui.FindOrCreateColumns(window, id)
    -- We have few columns per window so for now we don't need bother much with turning this into a faster lookup.
    for _, c in window.ColumnsStorage:iter() do
        if c.ID == id then
            return c
        end
    end

    local columns = ImGuiOldColumns()
    window.ColumnsStorage:push_back(columns)
    columns.ID = id
    return columns
end

function ImGui.GetColumnsID(str_id, columns_count)
    local window = ImGui.GetCurrentWindow()

    -- Differentiate column ID with an arbitrary prefix for cases where users name their columns set the same as another widget.
    ImGui.PushID(0x11223347 + (str_id and 0 or columns_count))
    local id = window:GetID(str_id or "columns")
    ImGui.PopID()

    return id
end

function ImGui.BeginColumns(str_id, columns_count, flags)
    if flags == nil then flags = 0 end
    local g = GImGui
    local window = ImGui.GetCurrentWindow()

    IM_ASSERT(columns_count >= 1)
    IM_ASSERT(window.DC.CurrentColumns == nil) -- Nested columns are currently not supported

    -- Acquire storage for the columns set
    local id = ImGui.GetColumnsID(str_id, columns_count)
    local columns = ImGui.FindOrCreateColumns(window, id)
    IM_ASSERT(columns.ID == id)
    columns.Current = 0
    columns.Count = columns_count
    columns.Flags = flags
    window.DC.CurrentColumns = columns
    window.DC.NavIsScrollPushableX = false -- Shortcut for NavUpdateCurrentWindowIsScrollPushableX();

    columns.HostCursorPosY = window.DC.CursorPos.y
    columns.HostCursorMaxPosX = window.DC.CursorMaxPos.x
    ImRect_Copy(columns.HostInitialClipRect, window.ClipRect)
    ImRect_Copy(columns.HostBackupParentWorkRect, window.ParentWorkRect)
    ImRect_Copy(window.ParentWorkRect, window.WorkRect)

    -- Set state for first column
    local column_padding = g.Style.ItemSpacing.x
    local half_clip_extend_x = ImTrunc(ImMax(window.WindowPadding.x * 0.5, window.WindowBorderSize))
    local max_1 = window.WorkRect.Max.x + column_padding - ImMax(column_padding - window.WindowPadding.x, 0.0)
    local max_2 = window.WorkRect.Max.x + half_clip_extend_x
    columns.OffMinX = window.DC.Indent.x - column_padding + ImMax(column_padding - window.WindowPadding.x, 0.0)
    columns.OffMaxX = ImMax(ImMin(max_1, max_2) - window.Pos.x, columns.OffMinX + 1.0)
    columns.LineMinY = window.DC.CursorPos.y; columns.LineMaxY = window.DC.CursorPos.y

    -- Clear data if columns count changed
    if columns.Columns.Size ~= 0 and columns.Columns.Size ~= columns_count + 1 then
        columns.Columns:resize(0)
    end

    -- Initialize default widths
    columns.IsFirstFrame = (columns.Columns.Size == 0)
    if columns.Columns.Size == 0 then
        for n = 0, columns_count do
            local column = ImGuiOldColumnData()
            column.OffsetNorm = n / columns_count
            columns.Columns:push_back(column)
        end
    end

    for n = 0, columns_count - 1 do
        -- Compute clipping rectangle
        local column = columns.Columns.Data[n + 1]
        local clip_x1 = IM_ROUND(window.Pos.x + ImGui.GetColumnOffset(n))
        local clip_x2 = IM_ROUND(window.Pos.x + ImGui.GetColumnOffset(n + 1) - 1.0)
        column.ClipRect = ImRect(clip_x1, -FLT_MAX, clip_x2, FLT_MAX)
        column.ClipRect:ClipWithFull(window.ClipRect)
    end

    if columns.Count > 1 then
        columns.Splitter:Split(window.DrawList, 1 + columns.Count)
        columns.Splitter:SetCurrentChannel(window.DrawList, 1)
        ImGui.PushColumnClipRect(0)
    end

    -- We don't generally store Indent.x inside ColumnsOffset because it may be manipulated by the user.
    local offset_0 = ImGui.GetColumnOffset(columns.Current)
    local offset_1 = ImGui.GetColumnOffset(columns.Current + 1)
    local width = offset_1 - offset_0
    ImGui.PushItemWidth(width * 0.65)
    window.DC.ColumnsOffset.x = ImMax(column_padding - window.WindowPadding.x, 0.0)
    window.DC.CursorPos.x = IM_TRUNC(window.Pos.x + window.DC.Indent.x + window.DC.ColumnsOffset.x)
    window.WorkRect.Max.x = window.Pos.x + offset_1 - column_padding
    window.WorkRect.Max.y = window.ContentRegionRect.Max.y
end

function ImGui.NextColumn()
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems or window.DC.CurrentColumns == nil then
        return
    end

    local g = GImGui
    local columns = window.DC.CurrentColumns

    if columns.Count == 1 then
        window.DC.CursorPos.x = IM_TRUNC(window.Pos.x + window.DC.Indent.x + window.DC.ColumnsOffset.x)
        IM_ASSERT(columns.Current == 0)
        return
    end

    -- Next column
    columns.Current = columns.Current + 1
    if columns.Current == columns.Count then
        columns.Current = 0
    end

    ImGui.PopItemWidth()

    -- Optimization: avoid PopClipRect() + SetCurrentChannel() + PushClipRect()
    local column = columns.Columns.Data[columns.Current + 1]
    ImGui.SetWindowClipRectBeforeSetChannel(window, column.ClipRect)
    columns.Splitter:SetCurrentChannel(window.DrawList, columns.Current + 1)

    local column_padding = g.Style.ItemSpacing.x
    columns.LineMaxY = ImMax(columns.LineMaxY, window.DC.CursorPos.y)
    if columns.Current > 0 then
        -- Columns 1+ ignore IndentX (by canceling it out)
        window.DC.ColumnsOffset.x = ImGui.GetColumnOffset(columns.Current) - window.DC.Indent.x + column_padding
    else
        -- New row/line: column 0 honor IndentX.
        window.DC.ColumnsOffset.x = ImMax(column_padding - window.WindowPadding.x, 0.0)
        window.DC.IsSameLine = false
        columns.LineMinY = columns.LineMaxY
    end
    window.DC.CursorPos.x = IM_TRUNC(window.Pos.x + window.DC.Indent.x + window.DC.ColumnsOffset.x)
    window.DC.CursorPos.y = columns.LineMinY
    window.DC.CurrLineSize.x = 0.0; window.DC.CurrLineSize.y = 0.0
    window.DC.CurrLineTextBaseOffset = 0.0

    local offset_0 = ImGui.GetColumnOffset(columns.Current)
    local offset_1 = ImGui.GetColumnOffset(columns.Current + 1)
    local width = offset_1 - offset_0
    ImGui.PushItemWidth(width * 0.65)
    window.WorkRect.Max.x = window.Pos.x + offset_1 - column_padding
end

function ImGui.EndColumns()
    local g = GImGui
    local window = ImGui.GetCurrentWindow()
    local columns = window.DC.CurrentColumns
    IM_ASSERT(columns ~= nil)

    ImGui.PopItemWidth()
    if columns.Count > 1 then
        ImGui.PopClipRect()
        columns.Splitter:Merge(window.DrawList)
    end

    local flags = columns.Flags
    columns.LineMaxY = ImMax(columns.LineMaxY, window.DC.CursorPos.y)
    window.DC.CursorPos.y = columns.LineMaxY
    if band(flags, ImGuiOldColumnFlags.GrowParentContentsSize) == 0 then
        window.DC.CursorMaxPos.x = columns.HostCursorMaxPosX -- Restore cursor max pos, as columns don't grow parent
    end

    -- Draw columns borders and handle resize
    local is_being_resized = false
    if band(flags, ImGuiOldColumnFlags.NoBorder) == 0 and not window.SkipItems then
        -- We clip Y boundaries CPU side because very long triangles are mishandled by some GPU drivers.
        local y1 = ImMax(columns.HostCursorPosY, window.ClipRect.Min.y)
        local y2 = ImMin(window.DC.CursorPos.y, window.ClipRect.Max.y)
        local dragging_column = -1
        for n = 1, columns.Count - 1 do
            local column = columns.Columns.Data[n + 1]
            local x = window.Pos.x + ImGui.GetColumnOffset(n)
            local column_id = band(columns.ID + n, 0xFFFFFFFF)
            local column_hit_hw = ImTrunc(COLUMNS_HIT_RECT_HALF_THICKNESS * g.CurrentDpiScale)
            local column_hit_rect = ImRect(ImVec2(x - column_hit_hw, y1), ImVec2(x + column_hit_hw, y2))
            if ImGui.ItemAdd(column_hit_rect, column_id, nil, ImGuiItemFlags.NoNav) then
                local hovered, held = false, false
                if band(flags, ImGuiOldColumnFlags.NoResize) == 0 then
                    local _
                    _, hovered, held = ImGui.ButtonBehavior(column_hit_rect, column_id)
                    if hovered or held then
                        ImGui.SetMouseCursor(ImGuiMouseCursor.ResizeEW)
                    end
                    if held and band(column.Flags, ImGuiOldColumnFlags.NoResize) == 0 then
                        dragging_column = n
                    end
                end

                -- Draw column
                local col = ImGui.GetColorU32(held and ImGuiCol.SeparatorActive or (hovered and ImGuiCol.SeparatorHovered or ImGuiCol.Separator))
                local xi = IM_TRUNC(x)
                window.DrawList:AddLineV(xi, y1 + 1.0, y2, col)
            end
        end

        -- Apply dragging after drawing the column lines, so our rendered lines are in sync with how items were displayed during the frame.
        if dragging_column ~= -1 then
            if not columns.IsBeingResized then
                for n = 0, columns.Count do
                    local c = columns.Columns.Data[n + 1]
                    c.OffsetNormBeforeResize = c.OffsetNorm
                end
            end
            columns.IsBeingResized = true; is_being_resized = true
            local x = GetDraggedColumnOffset(columns, dragging_column)
            ImGui.SetColumnOffset(dragging_column, x)
        end
    end
    columns.IsBeingResized = is_being_resized

    ImRect_Copy(window.WorkRect, window.ParentWorkRect)
    ImRect_Copy(window.ParentWorkRect, columns.HostBackupParentWorkRect)
    window.DC.CurrentColumns = nil
    window.DC.ColumnsOffset.x = 0.0
    window.DC.CursorPos.x = IM_TRUNC(window.Pos.x + window.DC.Indent.x + window.DC.ColumnsOffset.x)
    ImGui.NavUpdateCurrentWindowIsScrollPushableX()
end

--- @param columns_count? int
--- @param id?            string
--- @param borders?       bool
function ImGui.Columns(columns_count, id, borders)
    if columns_count == nil then columns_count = 1 end
    if borders == nil then borders = true end
    local window = ImGui.GetCurrentWindow()
    IM_ASSERT(columns_count >= 1)

    local flags = borders and 0 or ImGuiOldColumnFlags.NoBorder
    local columns = window.DC.CurrentColumns
    if columns ~= nil and columns.Count == columns_count and columns.Flags == flags then
        return
    end

    if columns ~= nil then
        ImGui.EndColumns()
    end

    if columns_count ~= 1 then
        ImGui.BeginColumns(id, columns_count, flags)
    end
end

return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imgui_tabs.lua'] = function()
--- ImGui Sincerely
-- Tab bars & tab items: 1:1 port of imgui_widgets.cpp [SECTION] Widgets: BeginTabBar/BeginTabItem (docking branch)
--
-- Port notes:
-- - tab_bar.Tabs is an ImVector of ImGuiTabItem tables (references). C++ pointer arithmetic on the array is replaced by
--   index lookups. tab_bar.LastTabItemIdx and tab orders are 0-based like upstream.
-- - Tab names are stored on the tab itself (tab.Name) instead of tab_bar.TabsNames.
-- - ImGui.BeginTabItem(label, p_open, flags) returns `visible, p_open`.

local MT = ImGui.GetMetatables()

local GImGui
local function SyncContext() GImGui = ImGui.GetCurrentContext() end

local function ImLinearSweep(current, target, speed)
    if current < target then return ImMin(current + speed, target) end
    if current > target then return ImMax(current - speed, target) end
    return current
end

local function TabItemGetSectionIdx(tab)
    if bit32.band(tab.Flags, ImGuiTabItemFlags.Leading) ~= 0 then return 0 end
    if bit32.band(tab.Flags, ImGuiTabItemFlags.Trailing) ~= 0 then return 2 end
    return 1
end

-- Stable sorts (C++ ImQsort is not stable, but the comparers are total orders in practice)
local function SortTabsBySection(tab_bar)
    table.sort(tab_bar.Tabs.Data, function(a, b)
        if a == nil or b == nil then return false end
        local sa, sb = TabItemGetSectionIdx(a), TabItemGetSectionIdx(b)
        if sa ~= sb then return sa < sb end
        return a.IndexDuringLayout < b.IndexDuringLayout
    end)
end

local function SortTabsByBeginOrder(tab_bar)
    local data = tab_bar.Tabs.Data
    if not data then return end
    local arr = {}
    for i = 1, tab_bar.Tabs.Size do arr[i] = data[i] end
    table.sort(arr, function(a, b) return a.BeginOrder < b.BeginOrder end)
    for i = 1, tab_bar.Tabs.Size do data[i] = arr[i] end
end

local function TabBarCalcScrollableWidth(tab_bar, sections)
    return tab_bar.BarRect:GetWidth() - sections[1].Width - sections[3].Width - sections[2].Spacing
end

local function ImGuiTabBarSection() return { TabCount = 0, Width = 0.0, WidthAfterShrinkMinWidth = 0.0, Spacing = 0.0 } end

-- items: 1-based array of ImGuiShrinkWidthItem, `first` = 1-based index of first item, `count` items
function ImGui.ShrinkWidths(items, first, count, width_excess, width_min)
    if count <= 0 then return end
    if count == 1 then
        local it = items[first]
        if it.Width >= 0.0 then it.Width = ImMax(it.Width - width_excess, width_min) end
        return
    end
    local slice = {}
    for n = 1, count do slice[n] = items[first + n - 1] end
    table.sort(slice, function(a, b)
        if a.Width ~= b.Width then return a.Width > b.Width end
        return a.Index < b.Index
    end)
    for n = 1, count do items[first + n - 1] = slice[n] end
    local it = slice
    local count_same_width = 1
    while width_excess > 0.001 and count_same_width < count do
        while count_same_width < count and it[1].Width <= it[count_same_width + 1].Width do
            count_same_width = count_same_width + 1
        end
        local max_width_to_remove_per_item = (count_same_width < count and it[count_same_width + 1].Width >= 0.0)
            and (it[1].Width - it[count_same_width + 1].Width) or (it[1].Width - 1.0)
        max_width_to_remove_per_item = ImMin(it[1].Width - width_min, max_width_to_remove_per_item)
        if max_width_to_remove_per_item <= 0.0 then break end
        local base_width_to_remove_per_item = ImMin(width_excess / count_same_width, max_width_to_remove_per_item)
        for item_n = 1, count_same_width do
            local w = ImMin(base_width_to_remove_per_item, it[item_n].Width - width_min)
            it[item_n].Width = it[item_n].Width - w
            width_excess = width_excess - w
        end
    end
    width_excess = 0.0
    for n = 1, count do
        local width_rounded = ImTrunc(it[n].Width)
        width_excess = width_excess + it[n].Width - width_rounded
        it[n].Width = width_rounded
    end
    local guard = 0
    while width_excess > 0.0 and guard < 10000 do
        guard = guard + 1
        local progressed = false
        for n = 1, count do
            if width_excess <= 0.0 then break end
            local width_to_add = ImMin(it[n].InitialWidth - it[n].Width, 1.0)
            if width_to_add > 0 then progressed = true end
            it[n].Width = it[n].Width + width_to_add
            width_excess = width_excess - width_to_add
        end
        if not progressed then break end
    end
end

---------------------------------------------------------------------------------------
-- [SECTION] Widgets: BeginTabBar, EndTabBar, etc.
---------------------------------------------------------------------------------------

function ImGui.TabBarFindByID(id)
    SyncContext()
    return GImGui.TabBars:GetByKey(id)
end

function ImGui.TabBarRemove(tab_bar)
    SyncContext()
    GImGui.TabBars:Remove(tab_bar.ID, tab_bar)
end

function ImGui.BeginTabBar(str_id, flags)
    if flags == nil then flags = 0 end
    SyncContext()
    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then return false end

    local id = window:GetID(str_id)
    local tab_bar = g.TabBars:GetOrAddByKey(id)
    local tab_bar_bb = ImRect(window.DC.CursorPos.x, window.DC.CursorPos.y, window.WorkRect.Max.x, window.DC.CursorPos.y + g.FontSize + g.Style.FramePadding.y * 2)
    tab_bar.ID = id
    tab_bar.SeparatorMinX = tab_bar_bb.Min.x - IM_TRUNC(window.WindowPadding.x * 0.5)
    tab_bar.SeparatorMaxX = tab_bar_bb.Max.x + IM_TRUNC(window.WindowPadding.x * 0.5)
    flags = bit32.bor(flags, ImGuiTabBarFlags.IsFocused)
    return ImGui.BeginTabBarEx(tab_bar, tab_bar_bb, flags)
end

function ImGui.BeginTabBarEx(tab_bar, tab_bar_bb, flags)
    SyncContext()
    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then return false end

    IM_ASSERT(tab_bar.ID ~= 0)
    if bit32.band(flags, ImGuiTabBarFlags.DockNode) == 0 then
        ImGui.PushOverrideID(tab_bar.ID)
    end

    g.CurrentTabBarStack:push_back(tab_bar)
    g.CurrentTabBar = tab_bar
    tab_bar.Window = window

    ImVec2_Copy(tab_bar.BackupCursorPos, window.DC.CursorPos)
    if tab_bar.CurrFrameVisible == g.FrameCount then
        ImVec2_CopyV(window.DC.CursorPos, tab_bar.BarRect.Min.x, tab_bar.BarRect.Max.y + tab_bar.ItemSpacingY)
        tab_bar.BeginCount = tab_bar.BeginCount + 1
        return true
    end

    if bit32.band(flags, ImGuiTabBarFlags.Reorderable) ~= bit32.band(tab_bar.Flags, ImGuiTabBarFlags.Reorderable)
        or (tab_bar.TabsAddedNew and bit32.band(flags, ImGuiTabBarFlags.Reorderable) == 0) then
        if bit32.band(flags, ImGuiTabBarFlags.DockNode) == 0 then
            SortTabsByBeginOrder(tab_bar)
        end
    end
    tab_bar.TabsAddedNew = false

    if bit32.band(flags, ImGuiTabBarFlags.FittingPolicyMask_) == 0 then
        flags = bit32.bor(flags, ImGuiTabBarFlags.FittingPolicyDefault_)
    end

    tab_bar.Flags = flags
    tab_bar.BarRect = ImRect(tab_bar_bb.Min, tab_bar_bb.Max)
    tab_bar.WantLayout = true
    tab_bar.PrevFrameVisible = tab_bar.CurrFrameVisible
    tab_bar.CurrFrameVisible = g.FrameCount
    tab_bar.PrevTabsContentsHeight = tab_bar.CurrTabsContentsHeight
    tab_bar.CurrTabsContentsHeight = 0.0
    tab_bar.ItemSpacingY = g.Style.ItemSpacing.y
    ImVec2_Copy(tab_bar.FramePadding, g.Style.FramePadding)
    tab_bar.TabsActiveCount = 0
    tab_bar.LastTabItemIdx = -1
    tab_bar.BeginCount = 1

    ImVec2_CopyV(window.DC.CursorPos, tab_bar.BarRect.Min.x, tab_bar.BarRect.Max.y + tab_bar.ItemSpacingY)

    local col = ImGui.GetColorU32(bit32.band(flags, ImGuiTabBarFlags.IsFocused) ~= 0 and ImGuiCol.TabSelected or ImGuiCol.TabDimmedSelected)
    if g.Style.TabBarBorderSize > 0.0 then
        local y = tab_bar.BarRect.Max.y
        window.DrawList:AddRectFilled(ImVec2(tab_bar.SeparatorMinX, y - g.Style.TabBarBorderSize), ImVec2(tab_bar.SeparatorMaxX, y), col)
    end
    return true
end

function ImGui.EndTabBar()
    SyncContext()
    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then return end

    local tab_bar = g.CurrentTabBar
    IM_ASSERT(tab_bar ~= nil, "Mismatched BeginTabBar()/EndTabBar()!")

    if tab_bar.WantLayout then ImGui.TabBarLayout(tab_bar) end

    local tab_bar_appearing = (tab_bar.PrevFrameVisible + 1 < g.FrameCount)
    if tab_bar.VisibleTabWasSubmitted or tab_bar.VisibleTabId == 0 or tab_bar_appearing then
        tab_bar.CurrTabsContentsHeight = ImMax(window.DC.CursorPos.y - tab_bar.BarRect.Max.y, tab_bar.CurrTabsContentsHeight)
        window.DC.CursorPos.y = tab_bar.BarRect.Max.y + tab_bar.CurrTabsContentsHeight
    else
        window.DC.CursorPos.y = tab_bar.BarRect.Max.y + tab_bar.PrevTabsContentsHeight
    end
    if tab_bar.BeginCount > 1 then
        ImVec2_Copy(window.DC.CursorPos, tab_bar.BackupCursorPos)
    end

    tab_bar.LastTabItemIdx = -1
    if bit32.band(tab_bar.Flags, ImGuiTabBarFlags.DockNode) == 0 then
        ImGui.PopID()
    end

    g.CurrentTabBarStack:pop_back()
    if g.CurrentTabBarStack.Size == 0 then g.CurrentTabBar = nil else g.CurrentTabBar = g.CurrentTabBarStack.Data[g.CurrentTabBarStack.Size] end
end

function ImGui.TabBarLayout(tab_bar)
    SyncContext()
    local g = GImGui
    tab_bar.WantLayout = false

    local scroll_to_selected_tab = (tab_bar.BarRectPrevWidth > tab_bar.BarRect:GetWidth())
    tab_bar.BarRectPrevWidth = tab_bar.BarRect:GetWidth()

    -- Garbage collect by compacting list
    local tabs = tab_bar.Tabs
    local tab_dst_n = 0
    local need_sort_by_section = false
    local sections = { ImGuiTabBarSection(), ImGuiTabBarSection(), ImGuiTabBarSection() } -- 1-based: [1]=Leading,[2]=Central,[3]=Trailing
    for tab_src_n = 0, tabs.Size - 1 do
        local tab = tabs.Data[tab_src_n + 1]
        if tab.LastFrameVisible < tab_bar.PrevFrameVisible or tab.WantClose then
            if tab_bar.VisibleTabId == tab.ID then tab_bar.VisibleTabId = 0 end
            if tab_bar.SelectedTabId == tab.ID then tab_bar.SelectedTabId = 0 end
            if tab_bar.NextSelectedTabId == tab.ID then tab_bar.NextSelectedTabId = 0 end
        else
            if tab_dst_n ~= tab_src_n then tabs.Data[tab_dst_n + 1] = tab end
            tab.IndexDuringLayout = tab_dst_n

            local curr_tab_section_n = TabItemGetSectionIdx(tab)
            if tab_dst_n > 0 then
                local prev_tab = tabs.Data[tab_dst_n]
                local prev_tab_section_n = TabItemGetSectionIdx(prev_tab)
                if curr_tab_section_n == 0 and prev_tab_section_n ~= 0 then need_sort_by_section = true end
                if prev_tab_section_n == 2 and curr_tab_section_n ~= 2 then need_sort_by_section = true end
            end
            sections[curr_tab_section_n + 1].TabCount = sections[curr_tab_section_n + 1].TabCount + 1
            tab_dst_n = tab_dst_n + 1
        end
    end
    if tabs.Size ~= tab_dst_n then
        for i = tab_dst_n + 1, tabs.Size do tabs.Data[i] = nil end
        tabs.Size = tab_dst_n
    end

    if need_sort_by_section then SortTabsBySection(tab_bar) end

    local tab_spacing = g.Style.ItemInnerSpacing.x
    sections[1].Spacing = (sections[1].TabCount > 0 and (sections[2].TabCount + sections[3].TabCount) > 0) and tab_spacing or 0.0
    sections[2].Spacing = (sections[2].TabCount > 0 and sections[3].TabCount > 0) and tab_spacing or 0.0

    local scroll_to_tab_id = 0
    if tab_bar.NextScrollToTabId ~= 0 then
        scroll_to_tab_id = tab_bar.NextScrollToTabId
        tab_bar.NextScrollToTabId = 0
    end
    if tab_bar.NextSelectedTabId ~= 0 then
        tab_bar.SelectedTabId = tab_bar.NextSelectedTabId
        tab_bar.NextSelectedTabId = 0
        scroll_to_tab_id = tab_bar.SelectedTabId
    end

    if tab_bar.ReorderRequestTabId ~= 0 then
        if ImGui.TabBarProcessReorder(tab_bar) then
            if tab_bar.ReorderRequestTabId == tab_bar.SelectedTabId then
                scroll_to_tab_id = tab_bar.ReorderRequestTabId
            end
        end
        tab_bar.ReorderRequestTabId = 0
    end

    local tab_list_popup_button = bit32.band(tab_bar.Flags, ImGuiTabBarFlags.TabListPopupButton) ~= 0
    if tab_list_popup_button then
        local tab_to_select = ImGui.TabBarTabListPopupButton(tab_bar)
        if tab_to_select then
            tab_bar.SelectedTabId = tab_to_select.ID
            scroll_to_tab_id = tab_to_select.ID
        end
    end

    -- shrink buffer layout: leading, trailing, central (0-based offsets)
    local shrink_buffer_indexes = { 0, sections[1].TabCount + sections[3].TabCount, sections[1].TabCount }
    local swb = g.ShrinkWidthBuffer
    swb:resize(tabs.Size)
    for i = 1, tabs.Size do if swb.Data[i] == nil then swb.Data[i] = ImGuiShrinkWidthItem() end end

    local shrink_min_width = (bit32.band(tab_bar.Flags, ImGuiTabBarFlags.FittingPolicyMixed) ~= 0) and g.Style.TabMinWidthShrink or 1.0

    local most_recently_selected_tab = nil
    local curr_section_n = -1
    local found_selected_tab_id = false
    for tab_n = 0, tabs.Size - 1 do
        local tab = tabs.Data[tab_n + 1]
        IM_ASSERT(tab.LastFrameVisible >= tab_bar.PrevFrameVisible)

        if (most_recently_selected_tab == nil or most_recently_selected_tab.LastFrameSelected < tab.LastFrameSelected) and bit32.band(tab.Flags, ImGuiTabItemFlags.Button) == 0 then
            most_recently_selected_tab = tab
        end
        if tab.ID == tab_bar.SelectedTabId then found_selected_tab_id = true end
        if scroll_to_tab_id == 0 and g.NavJustMovedToId == tab.ID then scroll_to_tab_id = tab.ID end

        local tab_name = ImGui.TabBarGetTabName(tab_bar, tab)
        local has_close_button_or_unsaved_marker = bit32.band(tab.Flags, ImGuiTabItemFlags.NoCloseButton) == 0 or bit32.band(tab.Flags, ImGuiTabItemFlags.UnsavedDocument) ~= 0
        tab.ContentWidth = (tab.RequestedWidth >= 0.0) and tab.RequestedWidth or ImGui.TabItemCalcSize(tab_name, has_close_button_or_unsaved_marker).x
        if bit32.band(tab.Flags, ImGuiTabItemFlags.Button) == 0 then
            tab.ContentWidth = ImMax(tab.ContentWidth, g.Style.TabMinWidthBase)
        end

        local section_n = TabItemGetSectionIdx(tab)
        local section = sections[section_n + 1]
        section.Width = section.Width + tab.ContentWidth + ((section_n == curr_section_n) and tab_spacing or 0.0)
        section.WidthAfterShrinkMinWidth = section.WidthAfterShrinkMinWidth + ImMin(tab.ContentWidth, shrink_min_width) + ((section_n == curr_section_n) and tab_spacing or 0.0)
        curr_section_n = section_n

        local item = swb.Data[shrink_buffer_indexes[section_n + 1] + 1]
        shrink_buffer_indexes[section_n + 1] = shrink_buffer_indexes[section_n + 1] + 1
        item.Index = tab_n
        item.Width = tab.ContentWidth
        item.InitialWidth = tab.ContentWidth
        tab.Width = ImMax(tab.ContentWidth, 1.0)
    end

    local width_all_tabs_after_min_width_shrink = 0.0
    tab_bar.WidthAllTabsIdeal = 0.0
    for section_n = 1, 3 do
        tab_bar.WidthAllTabsIdeal = tab_bar.WidthAllTabsIdeal + sections[section_n].Width + sections[section_n].Spacing
        width_all_tabs_after_min_width_shrink = width_all_tabs_after_min_width_shrink + sections[section_n].WidthAfterShrinkMinWidth + sections[section_n].Spacing
    end

    local can_scroll = bit32.band(tab_bar.Flags, ImGuiTabBarFlags.FittingPolicyScroll) ~= 0 or bit32.band(tab_bar.Flags, ImGuiTabBarFlags.FittingPolicyMixed) ~= 0
    local width_all_tabs_to_use_for_scroll = (bit32.band(tab_bar.Flags, ImGuiTabBarFlags.FittingPolicyScroll) ~= 0) and tab_bar.WidthAllTabs or width_all_tabs_after_min_width_shrink
    tab_bar.ScrollButtonEnabled = (width_all_tabs_to_use_for_scroll > tab_bar.BarRect:GetWidth() and tabs.Size > 1)
        and bit32.band(tab_bar.Flags, ImGuiTabBarFlags.NoTabListScrollingButtons) == 0 and can_scroll
    if tab_bar.ScrollButtonEnabled then
        local scroll_and_select_tab = ImGui.TabBarScrollingButtons(tab_bar)
        if scroll_and_select_tab then
            if bit32.band(scroll_and_select_tab.Flags, ImGuiTabItemFlags.Button) == 0 then
                tab_bar.SelectedTabId = scroll_and_select_tab.ID
            end
            scroll_to_tab_id = scroll_and_select_tab.ID
        end
    end
    if scroll_to_tab_id == 0 and scroll_to_selected_tab then
        scroll_to_tab_id = tab_bar.SelectedTabId
    end

    local section_0_w = sections[1].Width + sections[1].Spacing
    local section_1_w = sections[2].Width + sections[2].Spacing
    local section_2_w = sections[3].Width + sections[3].Spacing
    local central_section_is_visible = (section_0_w + section_2_w) < tab_bar.BarRect:GetWidth()
    local width_excess
    if central_section_is_visible then
        width_excess = ImMax(section_1_w - (tab_bar.BarRect:GetWidth() - section_0_w - section_2_w), 0.0)
    else
        width_excess = (section_0_w + section_2_w) - tab_bar.BarRect:GetWidth()
    end

    local can_shrink = bit32.band(tab_bar.Flags, ImGuiTabBarFlags.FittingPolicyShrink) ~= 0 or bit32.band(tab_bar.Flags, ImGuiTabBarFlags.FittingPolicyMixed) ~= 0
    if width_excess >= 1.0 and (can_shrink or not central_section_is_visible) then
        local shrink_data_count = central_section_is_visible and sections[2].TabCount or (sections[1].TabCount + sections[3].TabCount)
        local shrink_data_offset = central_section_is_visible and (sections[1].TabCount + sections[3].TabCount) or 0
        ImGui.ShrinkWidths(swb.Data, shrink_data_offset + 1, shrink_data_count, width_excess, shrink_min_width)

        for tab_n = shrink_data_offset, shrink_data_offset + shrink_data_count - 1 do
            local item = swb.Data[tab_n + 1]
            local tab = tabs.Data[item.Index + 1]
            local shrinked_width = IM_TRUNC(item.Width)
            if shrinked_width >= 0.0 then
                shrinked_width = ImMax(1.0, shrinked_width)
                local section_n = TabItemGetSectionIdx(tab)
                sections[section_n + 1].Width = sections[section_n + 1].Width - (tab.Width - shrinked_width)
                tab.Width = shrinked_width
            end
        end
    end

    -- Layout all active tabs
    local section_tab_index = 0
    local tab_offset = 0.0
    tab_bar.WidthAllTabs = 0.0
    for section_n = 0, 2 do
        local section = sections[section_n + 1]
        if section_n == 2 then
            tab_offset = ImMin(ImMax(0.0, tab_bar.BarRect:GetWidth() - section.Width), tab_offset)
        end
        for tab_n = 0, section.TabCount - 1 do
            local tab = tabs.Data[section_tab_index + tab_n + 1]
            tab.Offset = tab_offset
            tab.NameOffset = -1
            tab_offset = tab_offset + tab.Width + ((tab_n < section.TabCount - 1) and g.Style.ItemInnerSpacing.x or 0.0)
        end
        tab_bar.WidthAllTabs = tab_bar.WidthAllTabs + ImMax(section.Width + section.Spacing, 0.0)
        tab_offset = tab_offset + section.Spacing
        section_tab_index = section_tab_index + section.TabCount
    end

    local tab_bar_appearing = (tab_bar.PrevFrameVisible + 1 < g.FrameCount)
    if found_selected_tab_id == false and not tab_bar_appearing then
        tab_bar.SelectedTabId = 0
    end
    if tab_bar.SelectedTabId == 0 and tab_bar.NextSelectedTabId == 0 and most_recently_selected_tab ~= nil then
        tab_bar.SelectedTabId = most_recently_selected_tab.ID
        scroll_to_tab_id = tab_bar.SelectedTabId
    end

    tab_bar.VisibleTabId = tab_bar.SelectedTabId
    tab_bar.VisibleTabWasSubmitted = false

    -- CTRL+TAB can override visible tab temporarily
    if g.NavWindowingTarget ~= nil and g.NavWindowingTarget.DockNode and g.NavWindowingTarget.DockNode.TabBar == tab_bar then
        tab_bar.VisibleTabId = g.NavWindowingTarget.TabId
        scroll_to_tab_id = tab_bar.VisibleTabId
    end

    if scroll_to_tab_id ~= 0 then
        ImGui.TabBarScrollToTab(tab_bar, scroll_to_tab_id, sections)
    elseif tab_bar.ScrollButtonEnabled and ImGui.IsMouseHoveringRect(tab_bar.BarRect.Min, tab_bar.BarRect.Max, true) and ImGui.IsWindowContentHoverable(g.CurrentWindow) then
        local wheel = g.IO.MouseWheelRequestAxisSwap and g.IO.MouseWheel or g.IO.MouseWheelH
        local wheel_key = g.IO.MouseWheelRequestAxisSwap and ImGuiKey.MouseWheelY or ImGuiKey.MouseWheelX
        if ImGui.TestKeyOwner(wheel_key, tab_bar.ID) and wheel ~= 0.0 then
            local scroll_step = wheel * TabBarCalcScrollableWidth(tab_bar, sections) / 3.0
            tab_bar.ScrollingTargetDistToVisibility = 0.0
            tab_bar.ScrollingTarget = ImGui.TabBarScrollClamp(tab_bar, tab_bar.ScrollingTarget - scroll_step)
        end
        ImGui.SetKeyOwner(wheel_key, tab_bar.ID)
    end

    tab_bar.ScrollingAnim = ImGui.TabBarScrollClamp(tab_bar, tab_bar.ScrollingAnim)
    tab_bar.ScrollingTarget = ImGui.TabBarScrollClamp(tab_bar, tab_bar.ScrollingTarget)
    if tab_bar.ScrollingAnim ~= tab_bar.ScrollingTarget then
        tab_bar.ScrollingSpeed = ImMax(tab_bar.ScrollingSpeed, 70.0 * g.FontSize)
        tab_bar.ScrollingSpeed = ImMax(tab_bar.ScrollingSpeed, math.abs(tab_bar.ScrollingTarget - tab_bar.ScrollingAnim) / 0.3)
        local teleport = (tab_bar.PrevFrameVisible + 1 < g.FrameCount) or (tab_bar.ScrollingTargetDistToVisibility > 10.0 * g.FontSize)
        tab_bar.ScrollingAnim = teleport and tab_bar.ScrollingTarget or ImLinearSweep(tab_bar.ScrollingAnim, tab_bar.ScrollingTarget, g.IO.DeltaTime * tab_bar.ScrollingSpeed)
    else
        tab_bar.ScrollingSpeed = 0.0
    end
    tab_bar.ScrollingRectMinX = tab_bar.BarRect.Min.x + sections[1].Width + sections[1].Spacing
    tab_bar.ScrollingRectMaxX = tab_bar.BarRect.Max.x - sections[3].Width - sections[2].Spacing

    local window = g.CurrentWindow
    ImVec2_Copy(window.DC.CursorPos, tab_bar.BarRect.Min)
    ImGui.ItemSize(ImVec2(tab_bar.WidthAllTabs, tab_bar.BarRect:GetHeight()), tab_bar.FramePadding.y)
    window.DC.IdealMaxPos.x = ImMax(window.DC.IdealMaxPos.x, tab_bar.BarRect.Min.x + tab_bar.WidthAllTabsIdeal)
end

function ImGui.TabBarCalcTabID(tab_bar, label, docked_window)
    if docked_window ~= nil then
        IM_ASSERT(bit32.band(tab_bar.Flags, ImGuiTabBarFlags.DockNode) ~= 0)
        local id = docked_window.TabId
        ImGui.KeepAliveID(id)
        return id
    end
    return ImGui.GetCurrentContext().CurrentWindow:GetID(label)
end

function ImGui.TabBarCalcMaxTabWidth()
    return ImGui.GetCurrentContext().FontSize * 20.0
end

function ImGui.TabBarFindTabByID(tab_bar, tab_id)
    if tab_id ~= 0 then
        for n = 1, tab_bar.Tabs.Size do
            local tab = tab_bar.Tabs.Data[n]
            if tab.ID == tab_id then return tab end
        end
    end
    return nil
end

--- @param order int # 0-based visible order
function ImGui.TabBarFindTabByOrder(tab_bar, order)
    if order < 0 or order >= tab_bar.Tabs.Size then return nil end
    return tab_bar.Tabs.Data[order + 1]
end

--- @return int # 0-based order
function ImGui.TabBarGetTabOrder(tab_bar, tab)
    local i = tab_bar.Tabs:find_index(tab)
    return i and (i - 1) or -1
end

function ImGui.TabBarFindMostRecentlySelectedTabForActiveWindow(tab_bar)
    local most_recently_selected_tab = nil
    for n = 1, tab_bar.Tabs.Size do
        local tab = tab_bar.Tabs.Data[n]
        if most_recently_selected_tab == nil or most_recently_selected_tab.LastFrameSelected < tab.LastFrameSelected then
            if tab.Window and tab.Window.WasActive then most_recently_selected_tab = tab end
        end
    end
    return most_recently_selected_tab
end

function ImGui.TabBarGetCurrentTab(tab_bar)
    if tab_bar.LastTabItemIdx < 0 or tab_bar.LastTabItemIdx >= tab_bar.Tabs.Size then return nil end
    return tab_bar.Tabs.Data[tab_bar.LastTabItemIdx + 1]
end

function ImGui.TabBarGetTabName(tab_bar, tab)
    if tab.Window then return tab.Window.Name end
    if tab.Name == nil then return "N/A" end
    return tab.Name
end

function ImGui.TabBarGetTabPos(tab_bar, tab)
    if bit32.band(tab.Flags, ImGuiTabItemFlags.SectionMask_) == 0 then
        return tab_bar.BarRect.Min + ImVec2(IM_TRUNC(tab.Offset - tab_bar.ScrollingAnim), 0.0)
    end
    return tab_bar.BarRect.Min + ImVec2(tab.Offset, 0.0)
end

function ImGui.TabBarAddTab(tab_bar, tab_flags, window)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(ImGui.TabBarFindTabByID(tab_bar, window.TabId) == nil)
    IM_ASSERT(g.CurrentTabBar ~= tab_bar)
    if not window.HasCloseButton then
        tab_flags = bit32.bor(tab_flags, ImGuiTabItemFlags.NoCloseButton)
    end
    local new_tab = ImGuiTabItem()
    new_tab.ID = window.TabId
    new_tab.Flags = tab_flags
    new_tab.LastFrameVisible = tab_bar.CurrFrameVisible
    if new_tab.LastFrameVisible == -1 then new_tab.LastFrameVisible = g.FrameCount - 1 end
    new_tab.Window = window
    tab_bar.Tabs:push_back(new_tab)
end

function ImGui.TabBarRemoveTab(tab_bar, tab_id)
    local tab = ImGui.TabBarFindTabByID(tab_bar, tab_id)
    if tab then tab_bar.Tabs:erase(tab_bar.Tabs:find_index(tab)) end
    if tab_bar.VisibleTabId == tab_id then tab_bar.VisibleTabId = 0 end
    if tab_bar.SelectedTabId == tab_id then tab_bar.SelectedTabId = 0 end
    if tab_bar.NextSelectedTabId == tab_id then tab_bar.NextSelectedTabId = 0 end
end

function ImGui.TabBarCloseTab(tab_bar, tab)
    if bit32.band(tab.Flags, ImGuiTabItemFlags.Button) ~= 0 then return end
    if bit32.band(tab.Flags, bit32.bor(ImGuiTabItemFlags.UnsavedDocument, ImGuiTabItemFlags.NoAssumedClosure)) == 0 then
        tab.WantClose = true
        if tab_bar.VisibleTabId == tab.ID then
            tab.LastFrameVisible = -1
            tab_bar.SelectedTabId = 0
            tab_bar.NextSelectedTabId = 0
        end
    else
        if tab_bar.VisibleTabId ~= tab.ID then ImGui.TabBarQueueFocus(tab_bar, tab) end
    end
end

function ImGui.TabBarScrollClamp(tab_bar, scrolling)
    scrolling = ImMin(scrolling, tab_bar.WidthAllTabs - tab_bar.BarRect:GetWidth())
    return ImMax(scrolling, 0.0)
end

function ImGui.TabBarScrollToTab(tab_bar, tab_id, sections)
    local tab = ImGui.TabBarFindTabByID(tab_bar, tab_id)
    if tab == nil then return end

    if bit32.band(tab.Flags, ImGuiTabItemFlags.Leading) ~= 0 then
        tab = tab_bar.Tabs.Data[sections[1].TabCount + 1]
    elseif bit32.band(tab.Flags, ImGuiTabItemFlags.Trailing) ~= 0 then
        tab = tab_bar.Tabs.Data[sections[1].TabCount + sections[2].TabCount + 1]
    end
    if tab == nil or bit32.band(tab.Flags, ImGuiTabItemFlags.SectionMask_) ~= 0 then return end

    local g = ImGui.GetCurrentContext()
    local margin = ImClamp(tab_bar.ScrollingRectMaxX - tab_bar.ScrollingRectMinX - tab.Width, g.Style.ItemInnerSpacing.x, g.FontSize * 1.0)
    local order = ImGui.TabBarGetTabOrder(tab_bar, tab)
    local scrollable_width = TabBarCalcScrollableWidth(tab_bar, sections)

    local tab_x1 = tab.Offset - sections[1].Width + ((order > sections[1].TabCount - 1) and -margin or 0.0)
    local tab_x2 = tab.Offset - sections[1].Width + tab.Width + ((order + 1 < tab_bar.Tabs.Size - sections[3].TabCount) and margin or 1.0)
    tab_bar.ScrollingTargetDistToVisibility = 0.0
    if tab_bar.ScrollingTarget > tab_x1 or (tab_x2 - tab_x1 >= scrollable_width) then
        tab_bar.ScrollingTargetDistToVisibility = ImMax(tab_bar.ScrollingAnim - tab_x2, 0.0)
        tab_bar.ScrollingTarget = tab_x1
    elseif tab_bar.ScrollingTarget < tab_x2 - scrollable_width then
        tab_bar.ScrollingTargetDistToVisibility = ImMax((tab_x1 - scrollable_width) - tab_bar.ScrollingAnim, 0.0)
        tab_bar.ScrollingTarget = tab_x2 - scrollable_width
    end
end

--- TabBarQueueFocus(tab_bar, tab) or TabBarQueueFocus(tab_bar, tab_name)
function ImGui.TabBarQueueFocus(tab_bar, tab)
    if type(tab) == "string" then
        IM_ASSERT(bit32.band(tab_bar.Flags, ImGuiTabBarFlags.DockNode) == 0)
        tab_bar.NextSelectedTabId = ImGui.TabBarCalcTabID(tab_bar, tab, nil)
        return
    end
    tab_bar.NextSelectedTabId = tab.ID
end

function ImGui.TabBarQueueReorder(tab_bar, tab, offset)
    IM_ASSERT(offset ~= 0)
    IM_ASSERT(tab_bar.ReorderRequestTabId == 0)
    tab_bar.ReorderRequestTabId = tab.ID
    tab_bar.ReorderRequestOffset = offset
end

function ImGui.TabBarQueueReorderFromMousePos(tab_bar, src_tab, mouse_pos)
    local g = ImGui.GetCurrentContext()
    IM_ASSERT(tab_bar.ReorderRequestTabId == 0)
    if bit32.band(tab_bar.Flags, ImGuiTabBarFlags.Reorderable) == 0 then return end

    local tab_spacing = g.Style.ItemInnerSpacing.x
    local is_central_section = bit32.band(src_tab.Flags, ImGuiTabItemFlags.SectionMask_) == 0
    local bar_offset = tab_bar.BarRect.Min.x - (is_central_section and tab_bar.ScrollingTarget or 0)

    local dir = ((bar_offset + src_tab.Offset) > mouse_pos.x) and -1 or 1
    local src_idx = ImGui.TabBarGetTabOrder(tab_bar, src_tab)
    local dst_idx = src_idx
    local i = src_idx
    while i >= 0 and i < tab_bar.Tabs.Size do
        local dst_tab = tab_bar.Tabs.Data[i + 1]
        if bit32.band(dst_tab.Flags, ImGuiTabItemFlags.NoReorder) ~= 0 then break end
        if bit32.band(dst_tab.Flags, ImGuiTabItemFlags.SectionMask_) ~= bit32.band(src_tab.Flags, ImGuiTabItemFlags.SectionMask_) then break end
        dst_idx = i
        local x1 = bar_offset + dst_tab.Offset - tab_spacing
        local x2 = bar_offset + dst_tab.Offset + dst_tab.Width + tab_spacing
        if (dir < 0 and mouse_pos.x > x1) or (dir > 0 and mouse_pos.x < x2) then break end
        i = i + dir
    end

    if dst_idx ~= src_idx then
        ImGui.TabBarQueueReorder(tab_bar, src_tab, dst_idx - src_idx)
    end
end

function ImGui.TabBarProcessReorder(tab_bar)
    local tab1 = ImGui.TabBarFindTabByID(tab_bar, tab_bar.ReorderRequestTabId)
    if tab1 == nil or bit32.band(tab1.Flags, ImGuiTabItemFlags.NoReorder) ~= 0 then return false end

    local tab1_order = ImGui.TabBarGetTabOrder(tab_bar, tab1)
    local tab2_order = tab1_order + tab_bar.ReorderRequestOffset
    if tab2_order < 0 or tab2_order >= tab_bar.Tabs.Size then return false end

    local tab2 = tab_bar.Tabs.Data[tab2_order + 1]
    if bit32.band(tab2.Flags, ImGuiTabItemFlags.NoReorder) ~= 0 then return false end
    if bit32.band(tab1.Flags, ImGuiTabItemFlags.SectionMask_) ~= bit32.band(tab2.Flags, ImGuiTabItemFlags.SectionMask_) then return false end

    -- Move tab1 to tab2's position, shifting the tabs in between
    table.remove(tab_bar.Tabs.Data, tab1_order + 1)
    table.insert(tab_bar.Tabs.Data, tab2_order + 1, tab1)

    if bit32.band(tab_bar.Flags, ImGuiTabBarFlags.SaveSettings) ~= 0 then ImGui.MarkIniSettingsDirty() end
    return true
end

function ImGui.TabBarScrollingButtons(tab_bar)
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow

    local arrow_button_size = ImVec2(g.FontSize - 2.0, g.FontSize + g.Style.FramePadding.y * 2.0)
    local scrolling_buttons_width = arrow_button_size.x * 2.0

    local backup_cursor_pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y)

    local select_dir = 0
    local tc = g.Style.Colors[ImGuiCol.Text]
    local arrow_col = ImVec4(tc.x, tc.y, tc.z, tc.w * 0.5)

    ImGui.PushStyleColor(ImGuiCol.Text, arrow_col)
    ImGui.PushStyleColor(ImGuiCol.Button, ImVec4(0, 0, 0, 0))
    ImGui.PushItemFlag(bit32.bor(ImGuiItemFlags.ButtonRepeat, ImGuiItemFlags.NoNav), true)
    local backup_repeat_delay = g.IO.KeyRepeatDelay
    local backup_repeat_rate = g.IO.KeyRepeatRate
    g.IO.KeyRepeatDelay = 0.250
    g.IO.KeyRepeatRate = 0.200
    local x = ImMax(tab_bar.BarRect.Min.x, tab_bar.BarRect.Max.x - scrolling_buttons_width)
    ImVec2_CopyV(window.DC.CursorPos, x, tab_bar.BarRect.Min.y)
    if ImGui.ArrowButtonEx("##<", ImGuiDir.Left, arrow_button_size, ImGuiButtonFlags.PressedOnClick) then select_dir = -1 end
    ImVec2_CopyV(window.DC.CursorPos, x + arrow_button_size.x, tab_bar.BarRect.Min.y)
    if ImGui.ArrowButtonEx("##>", ImGuiDir.Right, arrow_button_size, ImGuiButtonFlags.PressedOnClick) then select_dir = 1 end
    ImGui.PopItemFlag()
    ImGui.PopStyleColor(2)
    g.IO.KeyRepeatRate = backup_repeat_rate
    g.IO.KeyRepeatDelay = backup_repeat_delay

    local tab_to_scroll_to = nil
    if select_dir ~= 0 then
        local tab_item = ImGui.TabBarFindTabByID(tab_bar, tab_bar.SelectedTabId)
        if tab_item then
            local selected_order = ImGui.TabBarGetTabOrder(tab_bar, tab_item)
            local target_order = selected_order + select_dir
            while tab_to_scroll_to == nil do
                local idx = (target_order >= 0 and target_order < tab_bar.Tabs.Size) and target_order or selected_order
                tab_to_scroll_to = tab_bar.Tabs.Data[idx + 1]
                if bit32.band(tab_to_scroll_to.Flags, ImGuiTabItemFlags.Button) ~= 0 then
                    target_order = target_order + select_dir
                    selected_order = selected_order + select_dir
                    if not (target_order < 0 or target_order >= tab_bar.Tabs.Size) then tab_to_scroll_to = nil end
                end
            end
        end
    end
    ImVec2_Copy(window.DC.CursorPos, backup_cursor_pos)
    tab_bar.BarRect.Max.x = tab_bar.BarRect.Max.x - (scrolling_buttons_width + 1.0)

    return tab_to_scroll_to
end

function ImGui.TabBarTabListPopupButton(tab_bar)
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow

    local tab_list_popup_button_width = g.FontSize + g.Style.FramePadding.y
    local backup_cursor_pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y)
    ImVec2_CopyV(window.DC.CursorPos, tab_bar.BarRect.Min.x - g.Style.FramePadding.y, tab_bar.BarRect.Min.y)
    tab_bar.BarRect.Min.x = tab_bar.BarRect.Min.x + tab_list_popup_button_width

    local tc = g.Style.Colors[ImGuiCol.Text]
    ImGui.PushStyleColor(ImGuiCol.Text, ImVec4(tc.x, tc.y, tc.z, tc.w * 0.5))
    ImGui.PushStyleColor(ImGuiCol.Button, ImVec4(0, 0, 0, 0))
    local open = ImGui.BeginCombo("##v", nil, bit32.bor(ImGuiComboFlags.NoPreview, ImGuiComboFlags.HeightLargest))
    ImGui.PopStyleColor(2)

    local tab_to_select = nil
    if open then
        for n = 1, tab_bar.Tabs.Size do
            local tab = tab_bar.Tabs.Data[n]
            if bit32.band(tab.Flags, ImGuiTabItemFlags.Button) == 0 then
                local tab_name = ImGui.TabBarGetTabName(tab_bar, tab)
                if ImGui.Selectable(tab_name, tab_bar.SelectedTabId == tab.ID) then
                    tab_to_select = tab
                end
            end
        end
        ImGui.EndCombo()
    end

    ImVec2_Copy(window.DC.CursorPos, backup_cursor_pos)
    return tab_to_select
end

---------------------------------------------------------------------------------------
-- [SECTION] Widgets: BeginTabItem, EndTabItem, etc.
---------------------------------------------------------------------------------------

--- @return bool visible, bool? p_open
function ImGui.BeginTabItem(label, p_open, flags)
    if flags == nil then flags = 0 end
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow
    if window.SkipItems then return false, p_open end

    local tab_bar = g.CurrentTabBar
    IM_ASSERT(tab_bar ~= nil, "Needs to be called between BeginTabBar() and EndTabBar()!")
    IM_ASSERT(bit32.band(flags, ImGuiTabItemFlags.Button) == 0)

    local ret
    ret, p_open = ImGui.TabItemEx(tab_bar, label, p_open, flags, nil)
    if ret and bit32.band(flags, ImGuiTabItemFlags.NoPushId) == 0 then
        local tab = tab_bar.Tabs.Data[tab_bar.LastTabItemIdx + 1]
        ImGui.PushOverrideID(tab.ID)
    end
    return ret, p_open
end

function ImGui.EndTabItem()
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow
    if window.SkipItems then return end

    local tab_bar = g.CurrentTabBar
    IM_ASSERT(tab_bar ~= nil, "Needs to be called between BeginTabBar() and EndTabBar()!")
    IM_ASSERT(tab_bar.LastTabItemIdx >= 0)
    local tab = tab_bar.Tabs.Data[tab_bar.LastTabItemIdx + 1]
    if bit32.band(tab.Flags, ImGuiTabItemFlags.NoPushId) == 0 then
        ImGui.PopID()
    end
end

function ImGui.TabItemButton(label, flags)
    if flags == nil then flags = 0 end
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow
    if window.SkipItems then return false end
    local tab_bar = g.CurrentTabBar
    IM_ASSERT(tab_bar ~= nil, "Needs to be called between BeginTabBar() and EndTabBar()!")
    return (ImGui.TabItemEx(tab_bar, label, nil, bit32.bor(flags, ImGuiTabItemFlags.Button, ImGuiTabItemFlags.NoReorder), nil))
end

function ImGui.TabItemSpacing(str_id, flags, width)
    local g = ImGui.GetCurrentContext()
    local window = g.CurrentWindow
    if window.SkipItems then return end
    local tab_bar = g.CurrentTabBar
    IM_ASSERT(tab_bar ~= nil, "Needs to be called between BeginTabBar() and EndTabBar()!")
    ImGui.SetNextItemWidth(width)
    ImGui.TabItemEx(tab_bar, str_id, nil, bit32.bor(flags or 0, ImGuiTabItemFlags.Button, ImGuiTabItemFlags.NoReorder, ImGuiTabItemFlags.Invisible), nil)
end

--- @return bool ret, bool? p_open
function ImGui.TabItemEx(tab_bar, label, p_open, flags, docked_window)
    local g = ImGui.GetCurrentContext()
    if tab_bar.WantLayout then
        local backup_next_item_data = {}
        for k, v in pairs(g.NextItemData) do backup_next_item_data[k] = v end
        ImGui.TabBarLayout(tab_bar)
        for k, v in pairs(backup_next_item_data) do g.NextItemData[k] = v end
    end
    local window = g.CurrentWindow
    if window.SkipItems then return false, p_open end

    local style = g.Style
    local id = ImGui.TabBarCalcTabID(tab_bar, label, docked_window)

    if p_open ~= nil and not p_open then
        ImGui.ItemAdd(ImRect(), id, nil, ImGuiItemFlags.NoNav)
        return false, p_open
    end

    IM_ASSERT(p_open == nil or bit32.band(flags, ImGuiTabItemFlags.Button) == 0)
    IM_ASSERT(bit32.band(flags, bit32.bor(ImGuiTabItemFlags.Leading, ImGuiTabItemFlags.Trailing)) ~= bit32.bor(ImGuiTabItemFlags.Leading, ImGuiTabItemFlags.Trailing))

    local has_p_open = (p_open ~= nil)
    if bit32.band(flags, ImGuiTabItemFlags.NoCloseButton) ~= 0 then
        has_p_open = false
    elseif not has_p_open then
        flags = bit32.bor(flags, ImGuiTabItemFlags.NoCloseButton)
    end

    local tab = ImGui.TabBarFindTabByID(tab_bar, id)
    local tab_is_new = false
    if tab == nil then
        tab = ImGuiTabItem()
        tab_bar.Tabs:push_back(tab)
        tab.ID = id
        tab_bar.TabsAddedNew = true
        tab_is_new = true
    end
    tab_bar.LastTabItemIdx = ImGui.TabBarGetTabOrder(tab_bar, tab)

    local size = ImGui.TabItemCalcSize(label, has_p_open or bit32.band(flags, ImGuiTabItemFlags.UnsavedDocument) ~= 0)
    tab.RequestedWidth = -1.0
    if bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasWidth) ~= 0 then
        size.x = g.NextItemData.Width
        tab.RequestedWidth = size.x
    end
    if tab_is_new then tab.Width = ImMax(1.0, size.x) end
    tab.ContentWidth = size.x
    tab.BeginOrder = tab_bar.TabsActiveCount
    tab_bar.TabsActiveCount = tab_bar.TabsActiveCount + 1

    local tab_bar_appearing = (tab_bar.PrevFrameVisible + 1 < g.FrameCount)
    local tab_bar_focused = bit32.band(tab_bar.Flags, ImGuiTabBarFlags.IsFocused) ~= 0
    local tab_appearing = (tab.LastFrameVisible + 1 < g.FrameCount)
    local tab_just_unsaved = bit32.band(flags, ImGuiTabItemFlags.UnsavedDocument) ~= 0 and bit32.band(tab.Flags, ImGuiTabItemFlags.UnsavedDocument) == 0
    local is_tab_button = bit32.band(flags, ImGuiTabItemFlags.Button) ~= 0
    tab.LastFrameVisible = g.FrameCount
    tab.Flags = flags
    tab.Window = docked_window

    if docked_window ~= nil then
        IM_ASSERT(bit32.band(tab_bar.Flags, ImGuiTabBarFlags.DockNode) ~= 0)
        tab.NameOffset = -1
        tab.Name = nil
    else
        tab.NameOffset = 0
        tab.Name = label
    end

    if not is_tab_button then
        if tab_appearing and bit32.band(tab_bar.Flags, ImGuiTabBarFlags.AutoSelectNewTabs) ~= 0 and tab_bar.NextSelectedTabId == 0 then
            if not tab_bar_appearing or tab_bar.SelectedTabId == 0 then
                ImGui.TabBarQueueFocus(tab_bar, tab)
            end
        end
        if bit32.band(flags, ImGuiTabItemFlags.SetSelected) ~= 0 and tab_bar.SelectedTabId ~= id then
            ImGui.TabBarQueueFocus(tab_bar, tab)
        end
    end

    local tab_contents_visible = (tab_bar.VisibleTabId == id)
    if tab_contents_visible then tab_bar.VisibleTabWasSubmitted = true end

    if not tab_contents_visible and tab_bar.SelectedTabId == 0 and tab_bar_appearing and docked_window == nil then
        if tab_bar.Tabs.Size == 1 and bit32.band(tab_bar.Flags, ImGuiTabBarFlags.AutoSelectNewTabs) == 0 then
            tab_contents_visible = true
        end
    end

    if tab_appearing and (not tab_bar_appearing or tab_is_new) then
        ImGui.ItemAdd(ImRect(), id, nil, ImGuiItemFlags.NoNav)
        if is_tab_button then return false, p_open end
        return tab_contents_visible, p_open
    end

    if tab_bar.SelectedTabId == id then tab.LastFrameSelected = g.FrameCount end

    local backup_main_cursor_pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y)

    local is_central_section = bit32.band(tab.Flags, ImGuiTabItemFlags.SectionMask_) == 0
    size.x = tab.Width
    local pos = ImGui.TabBarGetTabPos(tab_bar, tab)
    ImVec2_Copy(window.DC.CursorPos, pos)
    local bb = ImRect(pos, pos + size)

    local want_clip_rect = is_central_section and (bb.Min.x < tab_bar.ScrollingRectMinX or bb.Max.x > tab_bar.ScrollingRectMaxX)
    if want_clip_rect then
        ImGui.PushClipRect(ImVec2(ImClamp(bb.Min.x, tab_bar.ScrollingRectMinX, tab_bar.ScrollingRectMaxX), bb.Min.y - 1), ImVec2(tab_bar.ScrollingRectMaxX, bb.Max.y), true)
    end

    local backup_cursor_max_pos = ImVec2(window.DC.CursorMaxPos.x, window.DC.CursorMaxPos.y)
    ImGui.ItemSize(bb:GetSize(), style.FramePadding.y)
    ImVec2_Copy(window.DC.CursorMaxPos, backup_cursor_max_pos)

    if not ImGui.ItemAdd(bb, id) then
        if want_clip_rect then ImGui.PopClipRect() end
        ImVec2_Copy(window.DC.CursorPos, backup_main_cursor_pos)
        return tab_contents_visible, p_open
    end

    local button_flags = bit32.bor(is_tab_button and ImGuiButtonFlags.PressedOnClickRelease or ImGuiButtonFlags.PressedOnClick, ImGuiButtonFlags.AllowOverlap)
    if g.DragDropActive and not ImGuiPayload_IsDataType(g.DragDropPayload, IMGUI_PAYLOAD_TYPE_WINDOW) then
        button_flags = bit32.bor(button_flags, ImGuiButtonFlags.PressedOnDragDropHold)
    end
    local hovered, held, pressed
    if bit32.band(flags, ImGuiTabItemFlags.Invisible) ~= 0 then
        hovered, held, pressed = false, false, false
    else
        pressed, hovered, held = ImGui.ButtonBehavior(bb, id, button_flags)
    end
    if pressed and not is_tab_button then ImGui.TabBarQueueFocus(tab_bar, tab) end

    if held and docked_window and g.ActiveId == id and g.ActiveIdIsJustActivated then
        g.ActiveIdWindow = docked_window
    end

    local node = docked_window and docked_window.DockNode or nil
    local single_floating_window_node = node and node:IsFloatingNode() and (node.Windows.Size == 1)
    if held and single_floating_window_node and ImGui.IsMouseDragging(0, 0.0) then
        ImGui.StartMouseMovingWindow(docked_window)
    elseif held and not tab_appearing and ImGui.IsMouseDragging(0) then
        local drag_dir = 0
        local drag_distance_from_edge_x = 0.0
        if not g.DragDropActive and (bit32.band(tab_bar.Flags, ImGuiTabBarFlags.Reorderable) ~= 0 or docked_window ~= nil) then
            if g.IO.MouseDelta.x < 0.0 and g.IO.MousePos.x < bb.Min.x then
                drag_dir = -1
                drag_distance_from_edge_x = bb.Min.x - g.IO.MousePos.x
                ImGui.TabBarQueueReorderFromMousePos(tab_bar, tab, g.IO.MousePos)
            elseif g.IO.MouseDelta.x > 0.0 and g.IO.MousePos.x > bb.Max.x then
                drag_dir = 1
                drag_distance_from_edge_x = g.IO.MousePos.x - bb.Max.x
                ImGui.TabBarQueueReorderFromMousePos(tab_bar, tab, g.IO.MousePos)
            end
        end

        local can_undock = docked_window ~= nil and bit32.band(docked_window.Flags, ImGuiWindowFlags.NoMove) == 0 and bit32.band(node.MergedFlags, ImGuiDockNodeFlags.NoUndocking) == 0
        if can_undock then
            local undocking_tab = (g.DragDropActive and g.DragDropPayload.SourceId == id)
            if not undocking_tab then
                local threshold_base = g.FontSize
                local threshold_x = threshold_base * 2.2
                local threshold_y = (threshold_base * 1.5) + ImClamp((math.abs(g.IO.MouseDragMaxDistanceAbs[0].x) - threshold_base * 2.0) * 0.20, 0.0, threshold_base * 4.0)
                local distance_from_edge_y = ImMax(bb.Min.y - g.IO.MousePos.y, g.IO.MousePos.y - bb.Max.y)
                if distance_from_edge_y >= threshold_y then undocking_tab = true end
                if drag_distance_from_edge_x > threshold_x then
                    if (drag_dir < 0 and ImGui.TabBarGetTabOrder(tab_bar, tab) == 0) or (drag_dir > 0 and ImGui.TabBarGetTabOrder(tab_bar, tab) == tab_bar.Tabs.Size - 1) then
                        undocking_tab = true
                    end
                end
            end

            if undocking_tab then
                ImGui.DockContextQueueUndockWindow(g, docked_window)
                g.MovingWindow = docked_window
                ImGui.SetActiveID(g.MovingWindow.MoveId, g.MovingWindow)
                ImVec2_Copy(g.ActiveIdClickOffset, g.ActiveIdClickOffset - (g.MovingWindow.Pos - bb.Min))
                g.ActiveIdNoClearOnFocusLoss = true
                ImGui.SetActiveIdUsingAllKeyboardKeys()
            end
        end
    end

    local is_visible = bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Visible) ~= 0 and bit32.band(flags, ImGuiTabItemFlags.Invisible) == 0
    if is_visible then
        local display_draw_list = window.DrawList
        local col_idx
        if held or hovered then col_idx = ImGuiCol.TabHovered
        elseif tab_contents_visible then col_idx = tab_bar_focused and ImGuiCol.TabSelected or ImGuiCol.TabDimmedSelected
        else col_idx = tab_bar_focused and ImGuiCol.Tab or ImGuiCol.TabDimmed end
        ImGui.TabItemBackground(display_draw_list, bb, flags, ImGui.GetColorU32(col_idx))
        if tab_contents_visible and bit32.band(tab_bar.Flags, ImGuiTabBarFlags.DrawSelectedOverline) ~= 0 and style.TabBarOverlineSize > 0.0 then
            local tl = ImVec2(bb.Min.x, bb.Min.y + style.TabBarOverlineSize * 0.5)
            local tr = ImVec2(bb.Max.x, bb.Min.y + style.TabBarOverlineSize * 0.5)
            local overline_col = ImGui.GetColorU32(tab_bar_focused and ImGuiCol.TabSelectedOverline or ImGuiCol.TabDimmedSelectedOverline)
            if style.TabRounding > 0.0 then
                local rounding = style.TabRounding
                display_draw_list:PathArcToFast(tl + ImVec2(rounding, rounding), rounding, 7, 9)
                display_draw_list:PathArcToFast(tr + ImVec2(-rounding, rounding), rounding, 9, 11)
                display_draw_list:PathStroke(overline_col, style.TabBarOverlineSize)
            else
                display_draw_list:AddLine(tl, tr, overline_col, style.TabBarOverlineSize)
            end
        end
        ImGui.RenderNavCursor(bb, id)

        local hovered_unblocked = ImGui.IsItemHovered(ImGuiHoveredFlags.AllowWhenBlockedByPopup)
        if tab_bar.SelectedTabId ~= tab.ID and hovered_unblocked and (ImGui.IsMouseClicked(1) or ImGui.IsMouseReleased(1)) and not is_tab_button then
            ImGui.TabBarQueueFocus(tab_bar, tab)
        end

        if bit32.band(tab_bar.Flags, ImGuiTabBarFlags.NoCloseWithMiddleMouseButton) ~= 0 then
            flags = bit32.bor(flags, ImGuiTabItemFlags.NoCloseWithMiddleMouseButton)
        end

        local close_button_id = has_p_open and ImGui.GetIDWithSeed("#CLOSE", nil, docked_window and docked_window.ID or id) or 0
        local label_flags = tab_just_unsaved and bit32.band(flags, bit32.bnot(ImGuiTabItemFlags.UnsavedDocument)) or flags
        local just_closed, text_clipped = ImGui.TabItemLabelAndCloseButton(display_draw_list, bb, label_flags, tab_bar.FramePadding, label, id, close_button_id, tab_contents_visible)
        if just_closed and has_p_open then
            p_open = false
            ImGui.TabBarCloseTab(tab_bar, tab)
        end

        if docked_window and (hovered or g.HoveredId == close_button_id) then
            g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredWindow)
        end

        if text_clipped and g.HoveredId == id and not held then
            if bit32.band(tab_bar.Flags, ImGuiTabBarFlags.NoTooltip) == 0 and bit32.band(tab.Flags, ImGuiTabItemFlags.NoTooltip) == 0 then
                local label_end = ImGui.FindRenderedTextEnd(label)
                ImGui.SetItemTooltip("%s", string.sub(label, 1, label_end - 1))
            end
        end
    end

    if want_clip_rect then ImGui.PopClipRect() end
    ImVec2_Copy(window.DC.CursorPos, backup_main_cursor_pos)

    if is_tab_button then return pressed, p_open end
    return tab_contents_visible, p_open
end

function ImGui.SetTabItemClosed(label)
    local g = ImGui.GetCurrentContext()
    local is_within_manual_tab_bar = g.CurrentTabBar and bit32.band(g.CurrentTabBar.Flags, ImGuiTabBarFlags.DockNode) == 0
    if is_within_manual_tab_bar then
        local tab_bar = g.CurrentTabBar
        local tab_id = ImGui.TabBarCalcTabID(tab_bar, label, nil)
        local tab = ImGui.TabBarFindTabByID(tab_bar, tab_id)
        if tab then tab.WantClose = true end
    else
        local window = ImGui.FindWindowByName(label)
        if window and window.DockIsActive then
            local node = window.DockNode
            if node then
                local tab_id = ImGui.TabBarCalcTabID(node.TabBar, label, window)
                ImGui.TabBarRemoveTab(node.TabBar, tab_id)
                window.DockTabWantClose = true
            end
        end
    end
end

--- TabItemCalcSize(label, has_close_button_or_unsaved_marker) or TabItemCalcSize(window)
function ImGui.TabItemCalcSize(label, has_close_button_or_unsaved_marker)
    if type(label) == "table" then
        local window = label
        return ImGui.TabItemCalcSize(window.Name, window.HasCloseButton or bit32.band(window.Flags, ImGuiWindowFlags.UnsavedDocument) ~= 0)
    end
    local g = ImGui.GetCurrentContext()
    local label_size = ImGui.CalcTextSize(label, nil, true)
    local size = ImVec2(label_size.x + g.Style.FramePadding.x, label_size.y + g.Style.FramePadding.y * 2.0)
    if has_close_button_or_unsaved_marker then
        size.x = size.x + g.Style.FramePadding.x + (g.Style.ItemInnerSpacing.x + g.FontSize)
    else
        size.x = size.x + g.Style.FramePadding.x + 1.0
    end
    return ImVec2(ImMin(size.x, ImGui.TabBarCalcMaxTabWidth()), size.y)
end

function ImGui.TabItemBackground(draw_list, bb, flags, col)
    local g = ImGui.GetCurrentContext()
    local width = bb:GetWidth()
    IM_ASSERT(width > 0.0)
    local rounding = ImMax(0.0, ImMin(bit32.band(flags, ImGuiTabItemFlags.Button) ~= 0 and g.Style.FrameRounding or g.Style.TabRounding, width * 0.5 - 1.0))
    local y1 = bb.Min.y + 1.0
    local y2 = bb.Max.y - g.Style.TabBarBorderSize
    draw_list:AddRectFilled(ImVec2(bb.Min.x, y1), ImVec2(bb.Max.x, y2), col, rounding, ImDrawFlags.RoundCornersTop)
    if g.Style.TabBorderSize > 0.0 then
        draw_list:PathLineTo(ImVec2(bb.Min.x, y2))
        draw_list:PathArcToFast(ImVec2(bb.Min.x + rounding, y1 + rounding), rounding, 6, 9)
        draw_list:PathArcToFast(ImVec2(bb.Max.x - rounding, y1 + rounding), rounding, 9, 12)
        draw_list:PathLineTo(ImVec2(bb.Max.x, y2))
        draw_list:PathStroke(ImGui.GetColorU32(ImGuiCol.Border), g.Style.TabBorderSize)
    end
end

--- @return bool just_closed, bool text_clipped
function ImGui.TabItemLabelAndCloseButton(draw_list, bb, flags, frame_padding, label, tab_id, close_button_id, is_contents_visible)
    local g = ImGui.GetCurrentContext()
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    if bb:GetWidth() <= 1.0 then return false, false end

    local text_ellipsis_clip_bb = ImRect(bb.Min.x + frame_padding.x, bb.Min.y + frame_padding.y, bb.Max.x - frame_padding.x, bb.Max.y)
    local text_clipped = (text_ellipsis_clip_bb.Min.x + label_size.x) > text_ellipsis_clip_bb.Max.x

    local button_sz = g.FontSize
    local button_pos = ImVec2(ImMax(bb.Min.x, bb.Max.x - frame_padding.x - button_sz), bb.Min.y + frame_padding.y)

    local close_button_pressed = false
    local close_button_visible = false
    local is_hovered = g.HoveredId == tab_id or g.HoveredId == close_button_id or g.ActiveId == tab_id or g.ActiveId == close_button_id

    if close_button_id ~= 0 then
        if is_contents_visible then
            close_button_visible = (g.Style.TabCloseButtonMinWidthSelected < 0.0) or (is_hovered and bb:GetWidth() >= ImMax(button_sz, g.Style.TabCloseButtonMinWidthSelected))
        else
            close_button_visible = (g.Style.TabCloseButtonMinWidthUnselected < 0.0) or (is_hovered and bb:GetWidth() >= ImMax(button_sz, g.Style.TabCloseButtonMinWidthUnselected))
        end
    end

    local unsaved_marker_visible = bit32.band(flags, ImGuiTabItemFlags.UnsavedDocument) ~= 0 and (button_pos.x + button_sz <= bb.Max.x) and (not close_button_visible or not is_hovered)
    if unsaved_marker_visible then
        local bullet_pos = button_pos + ImVec2(button_sz, button_sz) * 0.5
        ImGui.RenderBullet(draw_list, bullet_pos, ImGui.GetColorU32(ImGuiCol.UnsavedMarker))
    elseif close_button_visible then
        local last_item_backup = ImGuiLastItemData()
        ImGuiLastItemData_Copy(last_item_backup, g.LastItemData)
        if ImGui.CloseButton(close_button_id, button_pos) then close_button_pressed = true end
        ImGuiLastItemData_Copy(g.LastItemData, last_item_backup)

        if is_hovered and bit32.band(flags, ImGuiTabItemFlags.NoCloseWithMiddleMouseButton) == 0 and ImGui.IsMouseClicked(2) then
            close_button_pressed = true
        end
    end

    local ellipsis_max_x = text_ellipsis_clip_bb.Max.x
    if close_button_visible or unsaved_marker_visible then
        local visible_without_hover = unsaved_marker_visible or ((is_contents_visible and g.Style.TabCloseButtonMinWidthSelected or g.Style.TabCloseButtonMinWidthUnselected) < 0.0)
        if visible_without_hover then
            text_ellipsis_clip_bb.Max.x = text_ellipsis_clip_bb.Max.x - button_sz * 0.90
            ellipsis_max_x = ellipsis_max_x - button_sz * 0.90
        else
            text_ellipsis_clip_bb.Max.x = text_ellipsis_clip_bb.Max.x - button_sz * 1.00
        end
    end
    ImGui.LogSetNextTextDecoration("/", "\\")
    ImGui.RenderTextEllipsis(draw_list, text_ellipsis_clip_bb.Min, text_ellipsis_clip_bb.Max, ellipsis_max_x, label, label_end, label_size)

    return close_button_pressed, text_clipped
end

return true
end

__FILES['imgui_widgets.lua'] = function()
--- ImGui Sincerely WIP
-- (Widgets Code)

--- @type ImGuiContext?
local GImGui

-- Sets local `GImGui` in this file(imgui_widgets.lua).
-- This is currently only used in main code `ImGui.SetCurrentContext()`
--- @param ctx ImGuiContext?
function ImGui._SetCurrentContext_Widgets(ctx)
    GImGui = ctx
end

local DRAGDROP_HOLD_TO_OPEN_TIMER = 0.70 -- Time for drag-hold to activate items accepting the ImGuiButtonFlags.PressedOnDragDropHold button behavior
local DRAG_MOUSE_THRESHOLD_FACTOR = 0.50 -- Multiplier for the default value of io.MouseDragThreshold to make DragFloat/DragInt react faster to mouse drags

local IM_S8_MIN = -128
local IM_S8_MAX = 127
local IM_U8_MIN = 0
local IM_U8_MAX = 0xFF
local IM_S16_MIN = -32768
local IM_S16_MAX = 32767
local IM_U16_MIN = 0
local IM_U16_MAX = 0xFFFF
local IM_S32_MIN = INT_MIN
local IM_S32_MAX = INT_MAX
local IM_U32_MIN = 0
local IM_U32_MAX = UINT_MAX

----------------------------------------------------------------
-- [SECTION] TEXT
----------------------------------------------------------------

--- @param text      string
--- @param text_end? int
--- @param flags?    ImGuiTextFlags
function ImGui.TextEx(text, text_end, flags)
    if not flags then flags = 0 end

    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then
        return
    end

    if not text or text == "" then
        text = ""
        text_end = 1
    end

    if text_end == nil then
        text_end = #text + 1
    end

    local text_pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y + window.DC.CurrLineTextBaseOffset)
    local wrap_pos_x = window.DC.TextWrapPos
    local wrap_enabled = (wrap_pos_x >= 0.0)
    if (text_end - 1 <= 2000) or wrap_enabled then
        local wrap_width = wrap_enabled and ImGui.CalcWrapWidthForPos(window.DC.CursorPos, wrap_pos_x) or 0.0
        local text_size = ImGui.CalcTextSize(text, text_end, false, wrap_width)

        local bb = ImRect(text_pos, text_pos + text_size)
        ImGui.ItemSize(text_size, 0.0)
        if not ImGui.ItemAdd(bb, 0) then
            return
        end

        ImGui.RenderTextWrapped(bb.Min, text, text_end, wrap_width)
    else
        local line = 1
        local line_height = ImGui.GetTextLineHeight()
        local text_size = ImVec2(0, 0)

        local pos = ImVec2(text_pos.x, text_pos.y)
        if not g.LogEnabled then
            local lines_skippable = ImFloor((window.ClipRect.Min.y - text_pos.y) / line_height)
            if lines_skippable > 0 then
                local lines_skipped = 0
                while line < text_end and lines_skipped < lines_skippable do
                    local line_end = ImMemchr(text, "\n", line)
                    if not line_end then
                        line_end = text_end
                    end
                    if bit32.band(flags, ImGuiTextFlags.NoWidthForLargeClippedText) == 0 then
                        local line_size = ImGui.CalcTextSizeEx(text, line, line_end)
                        text_size.x = ImMax(text_size.x, line_size.x)
                    end
                    line = line_end + 1
                    lines_skipped = lines_skipped + 1
                end
                pos.y = pos.y + lines_skipped * line_height
            end
        end

        if line < text_end then
            local line_rect = ImRect(pos, pos + ImVec2(FLT_MAX, line_height))
            while line < text_end do
                if ImGui.IsClippedEx(line_rect, 0) then
                    break
                end

                local line_end = ImMemchr(text, "\n", line)
                if not line_end then
                    line_end = text_end
                end

                local line_size = ImGui.CalcTextSizeEx(text, line, line_end)
                text_size.x = ImMax(text_size.x, line_size.x)
                ImGui.RenderText(pos, text, line, nil, false)
                line = line_end + 1
                line_rect.Min.y = line_rect.Min.y + line_height
                line_rect.Max.y = line_rect.Max.y + line_height
                pos.y = pos.y + line_height
            end

            local lines_skipped = 0
            while line < text_end do
                local line_end = ImMemchr(text, "\n", line)
                if not line_end then
                    line_end = text_end
                end
                if bit32.band(flags, ImGuiTextFlags.NoWidthForLargeClippedText) == 0 then
                    local line_size = ImGui.CalcTextSizeEx(text, line, line_end)
                    text_size.x = ImMax(text_size.x, line_size.x)
                end
                line = line_end + 1
                lines_skipped = lines_skipped + 1
            end
            pos.y = pos.y + lines_skipped * line_height
        end
        text_size.y = pos.y - text_pos.y

        local bb = ImRect(text_pos, text_pos + text_size)
        ImGui.ItemSize(text_size, 0.0)
        ImGui.ItemAdd(bb, 0)
    end
end

--- @param text      string
--- @param text_end? int
function ImGui.TextUnformatted(text, text_end)
    ImGui.TextEx(text, text_end, ImGuiTextFlags.NoWidthForLargeClippedText)
end

--- @param fmt string
--- @param ... any
function ImGui.TextV(fmt, ...)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local text = ImFormatString(fmt, ...)
    ImGui.TextEx(text, nil, ImGuiTextFlags.NoWidthForLargeClippedText)
end

--- @param fmt string
--- @param ... any
function ImGui.Text(fmt, ...)
    if select('#', ...) > 0 then
        ImGui.TextV(fmt, ...)
    else
        ImGui.TextEx(fmt)
    end
end

--- @param col ImVec4
--- @param fmt string
--- @param ... any
function ImGui.TextColored(col, fmt, ...)
    ImGui.PushStyleColor(ImGuiCol.Text, col)
    ImGui.TextV(fmt, ...)
    ImGui.PopStyleColor()
end

--- @param fmt string
--- @param ... any
function ImGui.TextDisabled(fmt, ...)
    local g = GImGui
    ImGui.PushStyleColor(ImGuiCol.Text, g.Style.Colors[ImGuiCol.TextDisabled])
    ImGui.TextV(fmt, ...)
    ImGui.PopStyleColor()
end

--- @param fmt string
--- @param ... any
function ImGui.TextWrapped(fmt, ...)
    local g = GImGui
    local need_backup = (g.CurrentWindow.DC.TextWrapPos < 0.0)
    if need_backup then
        ImGui.PushTextWrapPos(0.0)
    end
    ImGui.TextV(fmt, ...)
    if need_backup then
        ImGui.PopTextWrapPos()
    end
end

-- align_x: 0.0f = left, 0.5f = center, 1.0f = right.
-- size_x : 0.0f = shortcut for GetContentRegionAvail().x
-- FIXME-WIP: Works but API is likely to be reworked. This is designed for 1 item on the line. (#7024)
--- @param align_x float
--- @param size_x  float
--- @param fmt     string
--- @param ...     any
function ImGui.TextAligned(align_x, size_x, fmt, ...)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local text = ImFormatString(fmt, ...)
    local text_end = #text + 1
    local text_size = ImGui.CalcTextSize(text, text_end)
    size_x = ImGui.CalcItemSize(ImVec2(size_x, 0.0), 0.0, text_size.y).x

    local pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y + window.DC.CurrLineTextBaseOffset)
    local pos_max = ImVec2(pos.x + size_x, window.ClipRect.Max.y)
    local size = ImVec2(ImMin(size_x, text_size.x), text_size.y)
    window.DC.CursorMaxPos.x = ImMax(window.DC.CursorMaxPos.x, pos.x + text_size.x)
    window.DC.IdealMaxPos.x = ImMax(window.DC.IdealMaxPos.x, pos.x + text_size.x)
    if align_x > 0.0 and text_size.x < size_x then
        pos.x = pos.x + ImTrunc((size_x - text_size.x) * align_x)
    end
    ImGui.RenderTextEllipsis(window.DrawList, pos, pos_max, pos_max.x, text, text_end, text_size)

    local backup_max_pos = ImVec2()
    ImVec2_Copy(backup_max_pos, window.DC.CursorMaxPos)
    ImGui.ItemSize(size)
    ImGui.ItemAdd(ImRect(pos, pos + size), 0)
    window.DC.CursorMaxPos.x = backup_max_pos.x -- Cancel out extending content size because right-aligned text would otherwise mess it up

    if size_x < text_size.x and ImGui.IsItemHovered(bit32.bor(ImGuiHoveredFlags.NoNavOverride, ImGuiHoveredFlags.AllowWhenDisabled, ImGuiHoveredFlags.ForTooltip)) then
        ImGui.SetTooltip("%.*s", text_end - 1, text)
    end
end

-- Add a label+text combo aligned to other label+value widgets
--- @param label string
--- @param fmt   string
--- @param ...   any
function ImGui.LabelText(label, fmt, ...)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local g = GImGui
    local style = g.Style
    local w = ImGui.CalcItemWidth()

    local value_text = ImFormatString(fmt, ...)
    local value_text_end = #value_text + 1
    local value_size = ImGui.CalcTextSize(value_text, value_text_end, false)
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)
    local value_bb = ImRect(pos, pos + ImVec2(w, value_size.y + style.FramePadding.y * 2))
    local total_bb = ImRect(pos, pos + ImVec2(w + ((label_size.x > 0.0) and (style.ItemInnerSpacing.x + label_size.x) or 0.0), ImMax(value_size.y, label_size.y) + style.FramePadding.y * 2))
    ImGui.ItemSize(total_bb, style.FramePadding.y)
    if not ImGui.ItemAdd(total_bb, 0) then
        return
    end

    -- Render
    ImGui.RenderTextClipped(value_bb.Min + style.FramePadding, value_bb.Max, value_text, value_text_end, value_size, ImVec2(0.0, 0.0))
    if label_size.x > 0.0 then
        ImGui.RenderText(ImVec2(value_bb.Max.x + style.ItemInnerSpacing.x, value_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
    end
end

--- @param fmt string
--- @param ... any
function ImGui.BulletText(fmt, ...)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local g = GImGui
    local style = g.Style

    local text = ImFormatString(fmt, ...)
    local text_end = #text + 1
    local label_size = ImGui.CalcTextSize(text, text_end, false)
    local total_size = ImVec2(g.FontSize + ((label_size.x > 0.0) and (label_size.x + style.FramePadding.x * 2) or 0.0), label_size.y) -- Empty text doesn't add padding
    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)
    pos.y = pos.y + window.DC.CurrLineTextBaseOffset
    ImGui.ItemSize(total_size, 0.0)
    local bb = ImRect(pos, pos + total_size)
    if not ImGui.ItemAdd(bb, 0) then
        return
    end

    -- Render
    local text_col = ImGui.GetColorU32(ImGuiCol.Text)
    ImGui.RenderBullet(window.DrawList, bb.Min + ImVec2(style.FramePadding.x + g.FontSize * 0.5, g.FontSize * 0.5), text_col)
    ImGui.RenderText(bb.Min + ImVec2(g.FontSize + style.FramePadding.x * 2, 0.0), text, 1, text_end, false)
end

-- va_list variants: identical to the varargs versions in Lua
ImGui.TextColoredV = ImGui.TextColored
ImGui.TextDisabledV = ImGui.TextDisabled
ImGui.TextWrappedV = ImGui.TextWrapped
ImGui.TextAlignedV = ImGui.TextAligned
ImGui.LabelTextV = ImGui.LabelText
ImGui.BulletTextV = ImGui.BulletText

-- Value(prefix, b) / Value(prefix, int) / Value(prefix, float, float_format)
-- Lua can't tell int from float: integers without float_format print as %d, otherwise %.3f
function ImGui.Value(prefix, v, float_format)
    if type(v) == "boolean" then
        ImGui.Text("%s: %s", prefix, v and "true" or "false")
    elseif float_format then
        ImGui.Text("%s: " .. float_format, prefix, v)
    elseif math.floor(v) == v then
        ImGui.Text("%s: %d", prefix, v)
    else
        ImGui.Text("%s: %.3f", prefix, v)
    end
end

----------------------------------------------------------------
-- [SECTION] MAIN: BUTTONS, SCROLLBARS, ...
----------------------------------------------------------------

--- @param bb     ImRect
--- @param id     ImGuiID
--- @param flags? ImGuiButtonFlags
function ImGui.ButtonBehavior(bb, id, flags)
    if flags == nil then flags = 0 end

    local g = GImGui

    local window = g.CurrentWindow

    local item_flags = (g.LastItemData.ID == id) and g.LastItemData.ItemFlags or g.CurrentItemFlags
    if bit32.band(flags, ImGuiButtonFlags.AllowOverlap) ~= 0 then
        item_flags = bit32.bor(item_flags, ImGuiItemFlags.AllowOverlap)
    end
    if bit32.band(item_flags, ImGuiItemFlags.NoFocus) ~= 0 then
        flags = bit32.bor(flags, ImGuiButtonFlags.NoFocus, ImGuiButtonFlags.NoNavFocus)
    end

    -- Default only reacts to left mouse button
    if bit32.band(flags, ImGuiButtonFlags.MouseButtonMask_) == 0 then
        flags = bit32.bor(flags, ImGuiButtonFlags.MouseButtonLeft)
    end

    -- Default behavior requires click + release inside bounding box
    if bit32.band(flags, ImGuiButtonFlags.PressedOnMask_) == 0 then
        flags = bit32.bor(flags, (bit32.band(item_flags, ImGuiItemFlags.ButtonRepeat) ~= 0) and ImGuiButtonFlags.PressedOnClick or ImGuiButtonFlags.PressedOnDefault_)
    end

    local backup_hovered_window = g.HoveredWindow
    local flatten_hovered_children = (bit32.band(flags, ImGuiButtonFlags.FlattenChildren) ~= 0) and g.HoveredWindow and g.HoveredWindow.RootWindowDockTree == window.RootWindowDockTree
    if flatten_hovered_children then
        g.HoveredWindow = window
    end

    local pressed = false
    local hovered = ImGui.ItemHoverable(bb, id, item_flags)
    if g.DragDropActive then
        if (bit32.band(flags, ImGuiButtonFlags.PressedOnDragDropHold) ~= 0) and (bit32.band(g.DragDropSourceFlags, ImGuiDragDropFlags.SourceNoHoldToOpenOthers) == 0) and ImGui.IsItemHovered(ImGuiHoveredFlags.AllowWhenBlockedByActiveItem) then
            hovered = true
            ImGui.SetHoveredID(id)

            if (g.HoveredIdTimer - g.IO.DeltaTime <= DRAGDROP_HOLD_TO_OPEN_TIMER) and (g.HoveredIdTimer >= DRAGDROP_HOLD_TO_OPEN_TIMER) then
                pressed = true
                g.DragDropHoldJustPressedId = id
                ImGui.FocusWindow(window)
            end
        end

        if (g.DragDropAcceptIdPrev == id) and (bit32.band(g.DragDropAcceptFlagsPrev, ImGuiDragDropFlags.AcceptDrawAsHovered) ~= 0) then
            hovered = true
        end
    end

    if (flatten_hovered_children) then
        g.HoveredWindow = backup_hovered_window
    end

    local test_owner_id = (bit32.band(flags, ImGuiButtonFlags.NoTestKeyOwner) ~= 0) and ImGuiKeyOwner_Any or id
    if hovered then
        IM_ASSERT(id ~= 0)

        local mouse_button_clicked = -1
        local mouse_button_released = -1
        for button = 0, 2 do
            if bit32.band(flags, bit32.lshift(ImGuiButtonFlags.MouseButtonLeft, button)) ~= 0 then -- Handle ImGuiButtonFlags.MouseButtonRight and ImGuiButtonFlags.MouseButtonMiddle here.
                if (ImGui.IsMouseClickedEx(button, ImGuiInputFlags.None, test_owner_id) and mouse_button_clicked == -1) then mouse_button_clicked = button end
                if (ImGui.IsMouseReleased(button, test_owner_id) and mouse_button_released == -1) then mouse_button_released = button end
            end
        end

        local mods_ok = (bit32.band(flags, ImGuiButtonFlags.NoKeyModsAllowed) == 0) or (not g.IO.KeyCtrl and not g.IO.KeyShift and not g.IO.KeyAlt)
        if mods_ok then
            if mouse_button_clicked ~= -1 and g.ActiveId ~= id then
                --- @cast mouse_button_clicked ImGuiMouseButton

                if bit32.band(flags, ImGuiButtonFlags.NoSetKeyOwner) == 0 then
                    ImGui.SetKeyOwner(ImGui.MouseButtonToKey(mouse_button_clicked), id)
                end

                if bit32.band(flags, bit32.bor(ImGuiButtonFlags.PressedOnClickRelease, ImGuiButtonFlags.PressedOnClickReleaseAnywhere)) ~= 0 then
                    ImGui.SetActiveID(id, window)
                    g.ActiveIdMouseButton = mouse_button_clicked

                    if bit32.band(flags, ImGuiButtonFlags.NoNavFocus) == 0 then
                        ImGui.SetFocusID(id, window)
                        ImGui.FocusWindow(window)
                    elseif bit32.band(flags, ImGuiButtonFlags.NoFocus) == 0 then
                        ImGui.FocusWindow(window, ImGuiFocusRequestFlags.RestoreFocusedChild)
                    end
                end

                if (bit32.band(flags, ImGuiButtonFlags.PressedOnClick) ~= 0) or ((bit32.band(flags, ImGuiButtonFlags.PressedOnDoubleClick) ~= 0) and g.IO.MouseClickedCount[mouse_button_clicked] == 2) then
                    pressed = true

                    if bit32.band(flags, ImGuiButtonFlags.NoHoldingActiveId) ~= 0 then
                        ImGui.ClearActiveID()
                    else
                        ImGui.SetActiveID(id, window)
                    end

                    g.ActiveIdMouseButton = mouse_button_clicked

                    if bit32.band(flags, ImGuiButtonFlags.NoNavFocus) == 0 then
                        ImGui.SetFocusID(id, window)
                        ImGui.FocusWindow(window)
                    elseif bit32.band(flags, ImGuiButtonFlags.NoFocus) == 0 then
                        ImGui.FocusWindow(window, ImGuiFocusRequestFlags.RestoreFocusedChild)
                    end
                end

                if bit32.band(flags, ImGuiButtonFlags.PressedOnRelease) ~= 0 then
                    -- FIXME: Traditionally ImGuiButtonFlags.PressedOnRelease never took ActiveId. Adding it in 2026-03-20 since ImGuiButtonFlags_NoHoldingActiveId can always be added.
                    -- We don't yet perform an explicit ClearActiveID() to reduce scope of change, but this possibility could be investigated.
                    if bit32.band(flags, ImGuiButtonFlags.NoHoldingActiveId) == 0 then
                        ImGui.SetActiveID(id, window) -- Hold on ID
                    end
                    g.ActiveIdMouseButton = mouse_button_clicked
                end
            end

            if bit32.band(flags, ImGuiButtonFlags.PressedOnRelease) ~= 0 then
                if mouse_button_released ~= -1 then
                    local has_repeated_at_least_once = (bit32.band(item_flags, ImGuiItemFlags.ButtonRepeat) ~= 0) and g.IO.MouseDownDurationPrev[mouse_button_released] >= g.IO.KeyRepeatDelay

                    if not has_repeated_at_least_once then
                        pressed = true
                    end

                    if bit32.band(flags, ImGuiButtonFlags.NoNavFocus) == 0 then
                        ImGui.SetFocusID(id, window)  -- FIXME: Lack of FocusWindow() call here is inconsistent with other paths. Research why.
                    end

                    ImGui.ClearActiveID()
                end
            end

            -- 'Repeat' mode acts when held regardless of _PressedOn flags (see table above).
            -- Relies on repeat logic of IsMouseClicked() but we may as well do it ourselves if we end up exposing finer RepeatDelay/RepeatRate settings.
            if g.ActiveId == id and (bit32.band(item_flags, ImGuiItemFlags.ButtonRepeat) ~= 0) then
                if g.IO.MouseDownDuration[g.ActiveIdMouseButton] > 0.0 and ImGui.IsMouseClickedEx(g.ActiveIdMouseButton, ImGuiInputFlags.Repeat, test_owner_id) then
                    pressed = true
                end
            end
        end

        if pressed and g.IO.ConfigNavCursorVisibleAuto then
            g.NavCursorVisible = false
        end
    end

    -- Keyboard/Gamepad navigation handling
    -- We report navigated and navigation-activated items as hovered but we don't set g.HoveredId to not interfere with mouse
    if bit32.band(item_flags, ImGuiItemFlags.Disabled) == 0 then
        if g.NavId == id and g.NavCursorVisible and g.NavHighlightItemUnderNav then
            if bit32.band(flags, ImGuiButtonFlags.NoHoveredOnFocus) == 0 then
                hovered = true
            end
        end
        if g.NavActivateDownId == id then
            local nav_activated_by_code = (g.NavActivateId == id)
            local nav_activated_by_inputs = (g.NavActivatePressedId == id)
            if not nav_activated_by_inputs and bit32.band(item_flags, ImGuiItemFlags.ButtonRepeat) ~= 0 then
                -- Avoid pressing multiple keys from triggering excessive amount of repeat events
                local key1 = ImGui.GetKeyData(g, ImGuiKey.Space)
                local key2 = ImGui.GetKeyData(g, ImGuiKey.Enter)
                local key3 = ImGui.GetKeyData(g, ImGuiKey.NavGamepadActivate)
                local t1 = ImMax(ImMax(key1.DownDuration, key2.DownDuration), key3.DownDuration)
                nav_activated_by_inputs = ImGui.CalcTypematicRepeatAmount(t1 - g.IO.DeltaTime, t1, g.IO.KeyRepeatDelay, g.IO.KeyRepeatRate) > 0
            end
            if nav_activated_by_code or nav_activated_by_inputs then
                -- Set active id so it can be queried by user via IsItemActive(), equivalent of holding the mouse button.
                pressed = true
                ImGui.SetActiveID(id, window)
                g.ActiveIdSource = g.NavInputSource
                if bit32.band(flags, ImGuiButtonFlags.NoNavFocus) == 0 and bit32.band(g.NavActivateFlags, ImGuiActivateFlags.FromShortcut) == 0 then
                    ImGui.SetFocusID(id, window)
                end
                if bit32.band(g.NavActivateFlags, ImGuiActivateFlags.FromShortcut) ~= 0 then
                    g.ActiveIdFromShortcut = true
                end
            end
        end
    end

    local held = false
    if g.ActiveId == id then
        if g.ActiveIdSource == ImGuiInputSource.Mouse then
            if g.ActiveIdIsJustActivated then
                g.ActiveIdClickOffset = g.IO.MousePos - bb.Min
            end

            local mouse_button = g.ActiveIdMouseButton
            if mouse_button == -1 then
                -- Fallback for the rare situation were g.ActiveId was set programmatically or from another widget (e.g. #6304).
                ImGui.ClearActiveID()
            elseif ImGui.IsMouseDown(mouse_button, test_owner_id) then
                held = true
            else
                local release_in = hovered and (bit32.band(flags, ImGuiButtonFlags.PressedOnClickRelease) ~= 0)
                local release_anywhere = (bit32.band(flags, ImGuiButtonFlags.PressedOnClickReleaseAnywhere) ~= 0)

                if (release_in or release_anywhere) and not g.DragDropActive then
                    -- Report as pressed when releasing the mouse (this is the most common path)
                    local is_double_click_release = (bit32.band(flags, ImGuiButtonFlags.PressedOnDoubleClick) ~= 0) and g.IO.MouseReleased[mouse_button] and g.IO.MouseClickedLastCount[mouse_button] == 2

                    local is_repeating_already = (bit32.band(item_flags, ImGuiItemFlags.ButtonRepeat) ~= 0) and g.IO.MouseDownDurationPrev[mouse_button] >= g.IO.KeyRepeatDelay

                    local is_button_avail_or_owned = ImGui.TestKeyOwner(ImGui.MouseButtonToKey(mouse_button), test_owner_id)

                    if not is_double_click_release and not is_repeating_already and is_button_avail_or_owned then
                        pressed = true
                    end
                end

                ImGui.ClearActiveID()
            end

            if bit32.band(flags, ImGuiButtonFlags.NoNavFocus) == 0 and g.IO.ConfigNavCursorVisibleAuto then
                g.NavCursorVisible = false
            end
        elseif g.ActiveIdSource == ImGuiInputSource.Keyboard or g.ActiveIdSource == ImGuiInputSource.Gamepad then
            -- When activated using Nav, we hold on the ActiveID until activation button is released
            if g.NavActivateDownId == id then
                held = true  -- hovered == true not true as we are already likely hovered on direct activation.
            else
                ImGui.ClearActiveID()
            end
        end

        if pressed then
            g.ActiveIdHasBeenPressedBefore = true
        end
    end

    if g.NavHighlightActivatedId == id and (bit32.band(item_flags, ImGuiItemFlags.Disabled) == 0) then
        hovered = true
    end

    return pressed, hovered, held
end

--- @param label     string
--- @param size_arg? ImVec2
--- @param flags?    ImGuiButtonFlags
--- @return bool
function ImGui.ButtonEx(label, size_arg, flags)
    if size_arg == nil then size_arg = ImVec2(0, 0) end
    if flags    == nil then flags    = 0            end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local style = g.Style
    local id = window:GetID(label)
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local pos = ImVec2() -- Don't modify the cursor!
    ImVec2_Copy(pos, window.DC.CursorPos)
    if bit32.band(flags, ImGuiButtonFlags.AlignTextBaseLine) ~= 0 and style.FramePadding.y < window.DC.CurrLineTextBaseOffset then
        pos.y = pos.y + window.DC.CurrLineTextBaseOffset - style.FramePadding.y
    end
    local size = ImGui.CalcItemSize(size_arg, label_size.x + style.FramePadding.x * 2.0, label_size.y + style.FramePadding.y * 2.0)

    local bb = ImRect(pos, pos + size)
    ImGui.ItemSize(size, style.FramePadding.y)
    if not ImGui.ItemAdd(bb, id) then
        return false
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id, flags)

    local col
    if held and hovered then
        col = ImGui.GetColorU32(ImGuiCol.ButtonActive)
    elseif hovered then
        col = ImGui.GetColorU32(ImGuiCol.ButtonHovered)
    else
        col = ImGui.GetColorU32(ImGuiCol.Button)
    end

    ImGui.RenderNavCursor(bb, id)
    ImGui.RenderFrame(bb.Min, bb.Max, col, true, style.FrameRounding)

    -- if (g.LogEnabled)
    --     LogSetNextTextDecoration("[", "]");
    ImGui.RenderTextClipped(bb.Min + style.FramePadding, bb.Max - style.FramePadding, label, label_end, label_size, style.ButtonTextAlign, bb)

    -- Automatically close popups
    --if (pressed && !(flags & ImGuiButtonFlags.DontClosePopups) && (window->Flags & ImGuiWindowFlags.Popup))
    --    CloseCurrentPopup();

    -- IMGUI_TEST_ENGINE_ITEM_INFO(id, label, g.LastItemData.StatusFlags);
    return pressed
end

--- @param label     string
--- @param size_arg? ImVec2
--- @return bool
function ImGui.Button(label, size_arg)
    return ImGui.ButtonEx(label, size_arg, ImGuiButtonFlags.None)
end

--- @param label string
--- @return bool
function ImGui.SmallButton(label)
    local g = GImGui
    local backup_padding_y = g.Style.FramePadding.y
    g.Style.FramePadding.y = 0.0
    local pressed = ImGui.ButtonEx(label, ImVec2(0, 0), ImGuiButtonFlags.AlignTextBaseLine)
    g.Style.FramePadding.y = backup_padding_y
    return pressed
end

--- @param str_id   string
--- @param size_arg ImVec2
--- @param flags?   ImGuiButtonFlags
function ImGui.InvisibleButton(str_id, size_arg, flags)
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    -- Ensure zero-size fits to contents
    local size = ImGui.CalcItemSize(ImVec2(size_arg.x ~= 0.0 and size_arg.x or -FLT_MIN, size_arg.y ~= 0.0 and size_arg.y or -FLT_MIN), 0.0, 0.0)

    local id = window:GetID(str_id)
    local bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + size)
    ImGui.ItemSize(size)

    local item_flags = (bit32.band(flags, ImGuiButtonFlags.EnableNav) ~= 0) and ImGuiItemFlags.None or ImGuiItemFlags.NoNav
    if not ImGui.ItemAdd(bb, id, nil, item_flags) then
        return false
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id, flags)
    ImGui.RenderNavCursor(bb, id)

    -- IMGUI_TEST_ENGINE_ITEM_INFO(id, str_id, g.LastItemData.StatusFlags)
    return pressed
end

--- @param str_id string
--- @param dir    ImGuiDir
--- @param size   ImVec2
--- @param flags? ImGuiButtonFlags
function ImGui.ArrowButtonEx(str_id, dir, size, flags)
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local id = window:GetID(str_id)
    local bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + size)
    local default_size = ImGui.GetFrameHeight()
    ImGui.ItemSize(size, (size.y >= default_size) and g.Style.FramePadding.y or -1.0)
    if not ImGui.ItemAdd(bb, id) then
        return false
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id, flags)

    -- Render
    local bg_col = ImGui.GetColorU32((held and hovered) and ImGuiCol.ButtonActive or hovered and ImGuiCol.ButtonHovered or ImGuiCol.Button)
    local text_col = ImGui.GetColorU32(ImGuiCol.Text)
    ImGui.RenderNavCursor(bb, id)
    ImGui.RenderFrame(bb.Min, bb.Max, bg_col, true, g.Style.FrameRounding)
    ImGui.RenderArrow(window.DrawList, bb.Min + ImVec2(ImMax(0.0, (size.x - g.FontSize) * 0.5), ImMax(0.0, (size.y - g.FontSize) * 0.5)), text_col, dir)

    -- IMGUI_TEST_ENGINE_ITEM_INFO(id, str_id, g.LastItemData.StatusFlags)
    return pressed
end

--- @param str_id string
--- @param dir    ImGuiDir
function ImGui.ArrowButton(str_id, dir)
    local sz = ImGui.GetFrameHeight()
    return ImGui.ArrowButtonEx(str_id, dir, ImVec2(sz, sz), ImGuiButtonFlags.None)
end

--- @param id  ImGuiID
--- @param pos ImVec2
--- @return bool
function ImGui.CloseButton(id, pos)
    local g = GImGui

    local window = g.CurrentWindow

    local bb = ImRect(pos, pos + ImVec2(g.FontSize, g.FontSize))
    local bb_interact = ImRect()
    ImRect_Copy(bb_interact, bb)

    local area_to_visible_ratio = window.OuterRectClipped:GetArea() / bb:GetArea()
    if area_to_visible_ratio < 1.5 then
        bb_interact:Expand(ImTrunc(bb_interact:GetSize() * -0.25))
    end

    local is_clipped = not ImGui.ItemAdd(bb_interact, id)

    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id)
    if is_clipped then
        return pressed
    end

    local bg_col
    if held then
        bg_col = ImGui.GetColorU32(ImGuiCol.ButtonActive)
    else
        bg_col = ImGui.GetColorU32(ImGuiCol.ButtonHovered)
    end

    if hovered then
        window.DrawList:AddRectFilled(bb.Min, bb.Max, bg_col)
    end

    local cross_center = bb:GetCenter() - ImVec2(0.5, 0.5)
    local cross_extent = g.FontSize * 0.5 * 0.7071 - 1
    local cross_col = ImGui.GetColorU32(ImGuiCol.Text)
    local cross_thickness = 1.0 -- FIXME-DPI
    window.DrawList:AddLine(cross_center + ImVec2(cross_extent, cross_extent), cross_center + ImVec2(-cross_extent, -cross_extent), cross_col, cross_thickness)
    window.DrawList:AddLine(cross_center + ImVec2(cross_extent, -cross_extent), cross_center + ImVec2(-cross_extent, cross_extent), cross_col, cross_thickness)

    return pressed
end

--- @return bool
function ImGui.CollapseButton(id, pos)
    local g = GImGui

    local window = g.CurrentWindow

    local bb = ImRect(pos, pos + ImVec2(g.FontSize, g.FontSize))

    local is_clipped = not ImGui.ItemAdd(bb, id)

    local pressed, hovered = ImGui.ButtonBehavior(bb, id)

    if hovered then
        window.DrawList:AddRectFilled(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.ButtonHovered))
    end

    if window.Collapsed then
        ImGui.RenderArrow(window.DrawList, bb.Min, ImGui.GetColorU32(ImGuiCol.Text), ImGuiDir.Right, 1)
    else
        ImGui.RenderArrow(window.DrawList, bb.Min, ImGui.GetColorU32(ImGuiCol.Text), ImGuiDir.Down, 1)
    end

    return pressed
end

--- @param window ImGuiWindow
--- @param axis   ImGuiAxis
--- @return ImGuiID
function ImGui.GetWindowScrollbarID(window, axis)
    if axis == ImGuiAxis.X then
        return window:GetID("#SCROLLX")
    else
        return window:GetID("#SCROLLY")
    end
end

--- @param window ImGuiWindow
--- @param axis   ImGuiAxis
--- @return ImRect
--- @nodiscard
function ImGui.GetWindowScrollbarRect(window, axis)
    local g = GImGui
    local outer_rect = window:Rect()
    local inner_rect = window.InnerRect

    -- (ScrollbarSizes.x = width of Y scrollbar; ScrollbarSizes.y = height of X scrollbar)
    local scrollbar_size = window.ScrollbarSizes[axis == ImGuiAxis.X and ImGuiAxis.Y or ImGuiAxis.X]
    IM_ASSERT(scrollbar_size >= 0.0)

    local border_size = IM_ROUND(window.WindowBorderSize * 0.5)
    local border_top = (bit32.band(window.Flags, ImGuiWindowFlags.MenuBar) ~= 0) and IM_ROUND(g.Style.FrameBorderSize * 0.5) or (bit32.band(window.Flags, ImGuiWindowFlags.NoTitleBar) ~= 0 and border_size or 0)

    if axis == ImGuiAxis.X then
        return ImRect(inner_rect.Min.x + border_size, ImMax(outer_rect.Min.y + border_size, outer_rect.Max.y - border_size - scrollbar_size), inner_rect.Max.x - border_size, outer_rect.Max.y - border_size)
    else
        return ImRect(ImMax(outer_rect.Min.x, outer_rect.Max.x - border_size - scrollbar_size), inner_rect.Min.y + border_top, outer_rect.Max.x - border_size, inner_rect.Max.y - border_size)
    end
end

--- @param window    ImGuiWindow
--- @param bb        ImRect
--- @param threshold float
--- @param axis      ImGuiAxis
function ImGui.ExtendHitBoxWhenNearViewportEdge(window, bb, threshold, axis)
    local window_rect = window.RootWindow:Rect()
    local viewport_rect = window.Viewport:GetMainRect()

    if window_rect.Min[axis] == viewport_rect.Min[axis] and bb.Min[axis] > window_rect.Min[axis] and bb.Min[axis] - threshold <= window_rect.Min[axis] then
        bb.Min[axis] = window_rect.Min[axis]
    end

    if window_rect.Max[axis] == viewport_rect.Max[axis] and bb.Max[axis] < window_rect.Max[axis] and bb.Max[axis] + threshold >= window_rect.Max[axis] then
        bb.Max[axis] = window_rect.Max[axis]
    end
end

--- @param bb_frame            ImRect
--- @param id                  ImGuiID
--- @param axis                ImGuiAxis
--- @param p_scroll_v          number
--- @param size_visible_v      number
--- @param size_contents_v     number
--- @param draw_rounding_flags ImDrawFlags
--- @return bool   is_held
--- @return number scroll_v # Updated p_scroll_v
function ImGui.ScrollbarEx(bb_frame, id, axis, p_scroll_v, size_visible_v, size_contents_v, draw_rounding_flags)
    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then
        return false, p_scroll_v
    end

    local bb_frame_width = bb_frame:GetWidth()
    local bb_frame_height = bb_frame:GetHeight()
    if bb_frame_width <= 0.0 or bb_frame_height <= 0.0 then
        return false, p_scroll_v
    end

    local alpha = 1.0
    if axis == ImGuiAxis.Y and bb_frame_height < bb_frame_width then
        alpha = ImSaturate(bb_frame_height / ImMax(bb_frame_width * 2.0, 1.0))
    end
    if alpha <= 0.0 then
        return false, p_scroll_v
    end

    local style = g.Style
    local allow_interaction = (alpha >= 1.0)

    local bb = ImRect()
    ImRect_Copy(bb, bb_frame)

    local padding = IM_TRUNC(ImMin(style.ScrollbarPadding, ImMin(bb_frame_width, bb_frame_height) * 0.5))
    bb:Expand(-padding)

    -- V denote the main, longer axis of the scrollbar (= height for a vertical scrollbar)
    local scrollbar_size_v
    if axis == ImGuiAxis.X then
        scrollbar_size_v = bb:GetWidth()
    else
        scrollbar_size_v = bb:GetHeight()
    end

    if scrollbar_size_v < 1.0 then
        return false, p_scroll_v
    end

    IM_ASSERT(ImMax(size_contents_v, size_visible_v) > 0.0)
    local win_size_v = ImMax(ImMax(size_contents_v, size_visible_v), 1)
    local grab_h_minsize = ImMin(bb:GetSize()[axis], style.GrabMinSize)
    local grab_h_pixels = ImTrunc(ImClamp(scrollbar_size_v * (size_visible_v / win_size_v), grab_h_minsize, scrollbar_size_v))
    local grab_h_norm = grab_h_pixels / scrollbar_size_v

    -- As a special thing, we allow scrollbar near the edge of a screen/viewport to be reachable with mouse at the extreme edge (#9276)
    local bb_hit = ImRect()
    ImRect_Copy(bb_hit, bb_frame)
    ImGui.ExtendHitBoxWhenNearViewportEdge(window, bb_hit, g.Style.WindowBorderSize, ImGuiAxis.X + ImGuiAxis.Y - axis) -- swap axis here

    ImGui.ItemAdd(bb_frame, id, nil, ImGuiItemFlags.NoNav)
    local pressed, hovered, held = ImGui.ButtonBehavior(bb_hit, id, ImGuiButtonFlags.NoNavFocus)

    local scroll_max = ImMax(1, size_contents_v - size_visible_v)
    local scroll_ratio = ImSaturate(p_scroll_v / scroll_max)
    local grab_v_norm = scroll_ratio * (scrollbar_size_v - grab_h_pixels) / scrollbar_size_v
    if held and allow_interaction and grab_h_norm < 1.0 then
        local scrollbar_pos_v = bb.Min[axis]
        local mouse_pos_v = g.IO.MousePos[axis]
        local clicked_v_norm = ImSaturate((mouse_pos_v - scrollbar_pos_v) / scrollbar_size_v)

        local held_dir
        if clicked_v_norm < grab_v_norm then
            held_dir = -1
        elseif clicked_v_norm > grab_v_norm + grab_h_norm then
            held_dir = 1
        else
            held_dir = 0
        end
        if g.ActiveIdIsJustActivated then
            local scroll_to_clicked_location = (g.IO.ConfigScrollbarScrollByPage == false) or g.IO.KeyShift or held_dir == 0

            if scroll_to_clicked_location then
                g.ScrollbarSeekMode = 0
            else
                g.ScrollbarSeekMode = held_dir
            end

            if held_dir == 0 and not g.IO.KeyShift then
                g.ScrollbarClickDeltaToGrabCenter = clicked_v_norm - grab_v_norm - grab_h_norm * 0.5
            else
                g.ScrollbarClickDeltaToGrabCenter = 0.0
            end
        end

        if g.ScrollbarSeekMode == 0 then
            scroll_v_norm = ImSaturate((clicked_v_norm - g.ScrollbarClickDeltaToGrabCenter - grab_h_norm * 0.5) / (1.0 - grab_h_norm))
            p_scroll_v = scroll_v_norm * scroll_max
        else
            if ImGui.IsMouseClickedEx(ImGuiMouseButton.Left, ImGuiInputFlags.Repeat) and held_dir == g.ScrollbarSeekMode then
                local page_dir
                if g.ScrollbarSeekMode > 0.0 then
                    page_dir = 1.0
                else
                    page_dir = -1.0
                end
                p_scroll_v = ImClamp(p_scroll_v + page_dir * size_visible_v, 0, scroll_max)
            end
        end

        scroll_ratio = ImSaturate(p_scroll_v / scroll_max)
        grab_v_norm = scroll_ratio * (scrollbar_size_v - grab_h_pixels) / scrollbar_size_v
    end

    local bg_col = ImGui.GetColorU32(ImGuiCol.ScrollbarBg)
    local grab_col
    if held then
        grab_col = ImGui.GetColorU32(ImGuiCol.ScrollbarGrabActive, alpha)
    elseif hovered then
        grab_col = ImGui.GetColorU32(ImGuiCol.ScrollbarGrabHovered, alpha)
    else
        grab_col = ImGui.GetColorU32(ImGuiCol.ScrollbarGrab, alpha)
    end
    window.DrawList:AddRectFilled(bb_frame.Min, bb_frame.Max, bg_col, window.WindowRounding, draw_rounding_flags)
    local grab_rect
    if axis == ImGuiAxis.X then
        local x1 = ImLerp(bb.Min.x, bb.Max.x, grab_v_norm)
        grab_rect = ImRect(x1, bb.Min.y, x1 + grab_h_pixels, bb.Max.y)
    else
        local y1 = ImLerp(bb.Min.y, bb.Max.y, grab_v_norm)
        grab_rect = ImRect(bb.Min.x, y1, bb.Max.x, y1 + grab_h_pixels)
    end

    window.DrawList:AddRectFilled(grab_rect.Min, grab_rect.Max, grab_col, style.ScrollbarRounding)

    return held, p_scroll_v
end

--- @param axis ImGuiAxis
function ImGui.Scrollbar(axis)
    local g = GImGui
    local window = g.CurrentWindow
    local id = ImGui.GetWindowScrollbarID(window, axis)

    -- Calculate scrollbar bounding box
    local bb = ImGui.GetWindowScrollbarRect(window, axis)
    local rounding_corners = ImGui.CalcRoundingFlagsForRectInRect(bb, window:Rect(), g.Style.WindowBorderSize)
    local size_visible = window.InnerRect.Max[axis] - window.InnerRect.Min[axis]
    local size_contents = window.ContentSize[axis] + window.WindowPadding[axis] * 2.0
    local scroll = window.Scroll[axis]
    local held
    held, scroll = ImGui.ScrollbarEx(bb, id, axis, scroll, size_visible, size_contents, rounding_corners)
    window.Scroll[axis] = scroll
end

-- - `uv0` and `uv1` are texture coordinates
--- @param tex_ref    ImTextureRef
--- @param image_size ImVec2
--- @param uv0?       ImVec2
--- @param uv1?       ImVec2
--- @param bg_col?    ImVec4
--- @param tint_col?  ImVec4
function ImGui.ImageWithBg(tex_ref, image_size, uv0, uv1, bg_col, tint_col)
    if uv0      == nil then uv0      = ImVec2(0, 0)       end
    if uv1      == nil then uv1      = ImVec2(1, 1)       end
    if bg_col   == nil then bg_col   = ImVec4(0, 0, 0, 0) end
    if tint_col == nil then tint_col = ImVec4(1, 1, 1, 1) end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local g = GImGui
    local padding = ImVec2(g.Style.ImageBorderSize, g.Style.ImageBorderSize)
    local bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + image_size + padding * 2.0)
    ImGui.ItemSize(bb)
    if not ImGui.ItemAdd(bb, 0) then
        return
    end

    -- Render
    local rounding = g.Style.ImageRounding
    if bg_col.w > 0.0 then
        window.DrawList:AddRectFilled(bb.Min + padding, bb.Max - padding, ImGui.GetColorU32(bg_col), rounding)
    end
    if rounding > 0.0 then
        window.DrawList:AddImageRounded(tex_ref, bb.Min + padding, bb.Max - padding, uv0, uv1, ImGui.GetColorU32(tint_col), rounding)
    else
        window.DrawList:AddImage(tex_ref, bb.Min + padding, bb.Max - padding, uv0, uv1, ImGui.GetColorU32(tint_col))
    end
    if g.Style.ImageBorderSize > 0.0 then
        window.DrawList:AddRect(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.Border), rounding, g.Style.ImageBorderSize, ImDrawFlags.None)
    end
end

--- @param tex_ref    ImTextureRef
--- @param image_size ImVec2
--- @param uv0?       ImVec2
--- @param uv1?       ImVec2
function ImGui.Image(tex_ref, image_size, uv0, uv1)
    ImGui.ImageWithBg(tex_ref, image_size, uv0, uv1)
end

--- @param id         ImGuiID
--- @param tex_ref    ImTextureRef
--- @param image_size ImVec2
--- @param uv0        ImVec2
--- @param uv1        ImVec2
--- @param bg_col     ImVec4
--- @param tint_col   ImVec4
--- @param flags?     ImGuiButtonFlags
function ImGui.ImageButtonEx(id, tex_ref, image_size, uv0, uv1, bg_col, tint_col, flags)
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local padding = g.Style.FramePadding
    local bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + image_size + padding * 2.0)
    ImGui.ItemSize(bb)
    if not ImGui.ItemAdd(bb, id) then
        return false
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id, flags)

    -- Render
    local col = ImGui.GetColorU32((held and hovered) and ImGuiCol.ButtonActive or hovered and ImGuiCol.ButtonHovered or ImGuiCol.Button)
    ImGui.RenderNavCursor(bb, id)
    ImGui.RenderFrame(bb.Min, bb.Max, col, true, g.Style.FrameRounding)
    if bg_col.w > 0.0 then
        window.DrawList:AddRectFilled(bb.Min + padding, bb.Max - padding, ImGui.GetColorU32(bg_col))
    end
    local image_rounding = ImMax(g.Style.FrameRounding - ImMax(padding.x, padding.y), g.Style.ImageRounding)
    if image_rounding > 0.0 then
        window.DrawList:AddImageRounded(tex_ref, bb.Min + padding, bb.Max - padding, uv0, uv1, ImGui.GetColorU32(tint_col), image_rounding)
    else
        window.DrawList:AddImage(tex_ref, bb.Min + padding, bb.Max - padding, uv0, uv1, ImGui.GetColorU32(tint_col))
    end

    return pressed
end

-- - ImageButton() adds style.FramePadding*2.0 to provided size. This is in order to facilitate fitting an image in a button.
-- - ImageButton() draws a background based on regular Button() color + optionally an inner background if specified. (#8165) -- FIXME: Maybe that's not the best design?
--- @param str_id     string
--- @param tex_ref    ImTextureRef
--- @param image_size ImVec2
--- @param uv0        ImVec2
--- @param uv1        ImVec2
--- @param bg_col     ImVec4
--- @param tint_col   ImVec4
function ImGui.ImageButton(str_id, tex_ref, image_size, uv0, uv1, bg_col, tint_col)
    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then
        return false
    end

    return ImGui.ImageButtonEx(window:GetID(str_id), tex_ref, image_size, uv0, uv1, bg_col, tint_col)
end

--- @param label string
--- @param v     bool
--- @return bool is_pressed
--- @return bool is_checked # The updated `v` passed in
function ImGui.Checkbox(label, v)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false, v
    end

    local g = GImGui
    local style = g.Style
    local id = window:GetID(label)
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local square_sz = ImGui.GetFrameHeight()
    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)

    local total_width
    if label_size.x > 0.0 then
        total_width = square_sz + style.ItemInnerSpacing.x + label_size.x
    else
        total_width = square_sz
    end
    local total_bb = ImRect(pos, pos + ImVec2(total_width, label_size.y + style.FramePadding.y * 2.0))
    ImGui.ItemSize(total_bb, style.FramePadding.y)
    local is_visible = ImGui.ItemAdd(total_bb, id)
    local is_multi_select = (bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.IsMultiSelect) ~= 0)
    if not is_visible then
        if not is_multi_select or not g.BoxSelectState.UnclipMode or not g.BoxSelectState.UnclipRect:Overlaps(total_bb) then  -- Extra layer of "no logic clip" for box-select support
            -- IMGUI_TEST_ENGINE_ITEM_INFO(id, label, g.LastItemData.StatusFlags | ImGuiItemStatusFlags_Checkable | (*v ? ImGuiItemStatusFlags_Checked : 0))
            return false, v
        end
    end

    local checked = v
    if is_multi_select then
        -- TODO: MultiSelectItemHeader()
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(total_bb, id)

    if is_multi_select then
        -- TODO: MultiSelectItemFooter()
    elseif pressed then
        checked = not checked
    end

    if v ~= checked then
        v = checked
        pressed = true
        ImGui.MarkItemEdited(id)
    end

    local check_bb = ImRect(pos, pos + ImVec2(square_sz, square_sz))
    local mixed_value = (bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.MixedValue) ~= 0)
    if is_visible then
        ImGui.RenderNavCursor(total_bb, id)

        local bg_col = ImGui.GetColorU32((held and hovered) and ImGuiCol.FrameBgActive or (hovered and ImGuiCol.FrameBgHovered or ((mixed_value or checked) and ImGuiCol.CheckboxSelectedBg or ImGuiCol.FrameBg)))
        local check_col = ImGui.GetColorU32(ImGuiCol.CheckMark)
        ImGui.RenderFrame(check_bb.Min, check_bb.Max, bg_col, true, style.FrameRounding)

        if mixed_value then
            -- Undocumented tristate/mixed/indeterminate checkbox (#2644)
            -- This may seem awkwardly designed because the aim is to make ImGuiItemFlags.MixedValue supported by all widgets (not just checkbox)
            local pad_val = ImMax(1.0, IM_TRUNC(square_sz / 3.6))
            local pad = ImVec2(pad_val, pad_val)
            window.DrawList:AddRectFilled(check_bb.Min + pad, check_bb.Max - pad, check_col, style.FrameRounding)
        elseif v then
            local pad = ImMax(1.0, IM_TRUNC(square_sz / 6.0))
            ImGui.RenderCheckMark(window.DrawList, check_bb.Min + ImVec2(pad, pad), check_col, square_sz - pad * 2.0)
        end
    end

    local label_pos = ImVec2(check_bb.Max.x + style.ItemInnerSpacing.x, check_bb.Min.y + style.FramePadding.y)
    if g.LogEnabled then
        -- ImGui.LogRenderedText(label_pos, mixed_value and "[~]" or (v and "[x]" or "[ ]"))
    end

    if is_visible and label_size.x > 0.0 then
        ImGui.RenderText(label_pos, label, 1, label_end, false)
    end

    -- IMGUI_TEST_ENGINE_ITEM_INFO(id, label, g.LastItemData.StatusFlags | ImGuiItemStatusFlags_Checkable | (*v ? ImGuiItemStatusFlags_Checked : 0))
    return pressed, v
end

--- @param label       string
--- @param flags       int
--- @param flags_value int
--- @return bool is_pressed
--- @return int  flags_new  # Updated `flags`
function ImGui.CheckboxFlags(label, flags, flags_value)
    local all_on = bit32.band(flags, flags_value) == flags_value
    local any_on = bit32.band(flags, flags_value) ~= 0
    local pressed
    if not all_on and any_on then
        local g = GImGui
        g.NextItemData.ItemFlagsSet = bit32.bor(g.NextItemData.ItemFlagsSet, ImGuiItemFlags.MixedValue)
        pressed, all_on = ImGui.Checkbox(label, all_on)
    else
        pressed, all_on = ImGui.Checkbox(label, all_on)
    end
    if pressed then
        if all_on then
            flags = bit32.bor(flags, flags_value)
        else
            flags = bit32.band(flags, bit32.bnot(flags_value))
        end
    end

    return pressed, flags
end
ImGui.CheckboxFlagsT = ImGui.CheckboxFlags

--- @param label  string
--- @param active bool
--- @return bool is_pressed
function ImGui.RadioButtonEx(label, active)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local style = g.Style
    local id = window:GetID(label)
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local square_sz = ImGui.GetFrameHeight()
    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)
    local check_bb = ImRect(pos, pos + ImVec2(square_sz, square_sz))
    local total_bb = ImRect(pos, pos + ImVec2(square_sz + (label_size.x > 0.0 and style.ItemInnerSpacing.x + label_size.x or 0.0), label_size.y + style.FramePadding.y * 2.0))
    ImGui.ItemSize(total_bb, style.FramePadding.y)
    if not ImGui.ItemAdd(total_bb, id) then
        return false
    end

    local center = check_bb:GetCenter()
    center.x = IM_ROUND(center.x)
    center.y = IM_ROUND(center.y)
    local radius = (square_sz - 1.0) * 0.5

    local pressed, hovered, held = ImGui.ButtonBehavior(total_bb, id)
    if (pressed) then
        ImGui.MarkItemEdited(id)
    end

    ImGui.RenderNavCursor(total_bb, id)
    local num_segment = window.DrawList:_CalcCircleAutoSegmentCount(radius)
    local col
    if held and hovered then
        col = ImGui.GetColorU32(ImGuiCol.FrameBgActive)
    else
        if hovered then
            col = ImGui.GetColorU32(ImGuiCol.FrameBgHovered)
        else
            col = ImGui.GetColorU32(ImGuiCol.FrameBg)
        end
    end
    window.DrawList:AddCircleFilled(center, radius, col, num_segment)
    if active then
        local pad = ImMax(1.0, IM_TRUNC(square_sz / 6.0))
        window.DrawList:AddCircleFilled(center, radius - pad, ImGui.GetColorU32(ImGuiCol.CheckMark))
    end
    if style.FrameBorderSize > 0.0 then
        window.DrawList:AddCircle(center + ImVec2(1, 1), radius, ImGui.GetColorU32(ImGuiCol.BorderShadow), num_segment, style.FrameBorderSize)
        window.DrawList:AddCircle(center, radius, ImGui.GetColorU32(ImGuiCol.Border), num_segment, style.FrameBorderSize)
    end
    local label_pos = ImVec2(check_bb.Max.x + style.ItemInnerSpacing.x, check_bb.Min.y + style.FramePadding.y)
    if g.LogEnabled then
        -- ImGui.LogRenderedText(label_pos, active and "(x)" or "( )")
    end
    if label_size.x > 0.0 then
        ImGui.RenderText(label_pos, label, 1, label_end, false)
    end

    return pressed
end

-- `rawequal` is used here to check if v == v_button
--- @param label    string
--- @param v        any
--- @param v_button any
--- @return bool is_pressed
--- @return any  v          # Updated v
function ImGui.RadioButton(label, v, v_button)
    local pressed = ImGui.RadioButtonEx(label, rawequal(v, v_button))
    if pressed then
        v = v_button
    end
    return pressed, v
end

-- size_arg (for each axis) < 0.0f: align to end, 0.0f: auto, > 0.0f: specified size
--- @param fraction  float
--- @param size_arg? ImVec2
--- @param overlay?  string
function ImGui.ProgressBar(fraction, size_arg, overlay)
    if size_arg == nil then size_arg = ImVec2(-FLT_MIN, 0) end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local g = GImGui
    local style = g.Style

    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)
    local size = ImGui.CalcItemSize(size_arg, ImGui.CalcItemWidth(), g.FontSize + style.FramePadding.y * 2.0)
    local bb = ImRect(pos, pos + size)
    ImGui.ItemSize(size, style.FramePadding.y)
    if not ImGui.ItemAdd(bb, 0) then
        return
    end

    -- Fraction < 0.0 will display an indeterminate progress bar animation
    -- The value must be animated along with time, so e.g. passing '-1.0 * ImGui.GetTime()' as fraction works
    local is_indeterminate = (fraction < 0.0)
    if not is_indeterminate then
        fraction = ImSaturate(fraction)
    end

    -- Out of courtesy we accept a NaN fraction without crashing
    local fill_n0 = 0.0
    local fill_n1 = (fraction == fraction) and fraction or 0.0

    if is_indeterminate then
        local fill_width_n = 0.2
        fill_n0 = ImFmod(-fraction, 1.0) * (1.0 + fill_width_n) - fill_width_n
        fill_n1 = ImSaturate(fill_n0 + fill_width_n)
        fill_n0 = ImSaturate(fill_n0)
    end

    -- Render
    ImGui.RenderFrame(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.FrameBg), true, style.FrameRounding)
    bb:Expand(ImVec2(-style.FrameBorderSize, -style.FrameBorderSize))

    local fill_x0 = ImLerp(bb.Min.x, bb.Max.x, fill_n0)
    local fill_x1 = ImLerp(bb.Min.x, bb.Max.x, fill_n1)
    if fill_x0 < fill_x1 then
        ImGui.RenderRectFilledInRangeH(window.DrawList, bb, ImGui.GetColorU32(ImGuiCol.PlotHistogram), fill_x0, fill_x1, style.FrameRounding)
    end

    -- Default displaying the fraction as percentage string, but user can override it
    -- Don't display text for indeterminate bars by default
    if not is_indeterminate or overlay ~= nil then
        if overlay == nil then
            overlay = ImFormatString("%.0f%%", fraction * 100 + 0.01)
        end

        local overlay_size = ImGui.CalcTextSize(overlay, nil)
        if overlay_size.x > 0.0 then
            local text_x = is_indeterminate and ((bb.Min.x + bb.Max.x - overlay_size.x) * 0.5) or (fill_x1 + style.ItemSpacing.x)
            ImGui.RenderTextClipped(ImVec2(ImClamp(text_x, bb.Min.x, bb.Max.x - overlay_size.x - style.ItemInnerSpacing.x), bb.Min.y), bb.Max, overlay, nil, overlay_size, ImVec2(0.0, 0.5), bb)
        end
    end
end

function ImGui.Bullet()
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local g = GImGui
    local style = g.Style
    local line_height = ImMax(ImMin(window.DC.CurrLineSize.y, g.FontSize + style.FramePadding.y * 2), g.FontSize)
    local bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + ImVec2(g.FontSize, line_height))
    ImGui.ItemSize(bb)
    if not ImGui.ItemAdd(bb, 0) then
        ImGui.SameLine(0, style.FramePadding.x * 2)
        return
    end

    -- Render and stay on same line
    local text_col = ImGui.GetColorU32(ImGuiCol.Text)
    ImGui.RenderBullet(window.DrawList, bb.Min + ImVec2(style.FramePadding.x + g.FontSize * 0.5, line_height * 0.5), text_col)
    ImGui.SameLine(0, style.FramePadding.x * 2.0)
end

--- @param label string
function ImGui.TextLink(label)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local id = window:GetID(label)
    local label_end = ImGui.FindRenderedTextEnd(label)

    local pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y + window.DC.CurrLineTextBaseOffset)
    local size = ImGui.CalcTextSize(label, label_end, false)
    local bb = ImRect(pos, pos + size)
    ImGui.ItemSize(size, 0.0)
    if not ImGui.ItemAdd(bb, id) then
        return false
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id)
    ImGui.RenderNavCursor(bb, id)

    if hovered then
        ImGui.SetMouseCursor(ImGuiMouseCursor.Hand)
    end

    local text_colf = ImVec4()
    ImVec4_Copy(text_colf, g.Style.Colors[ImGuiCol.TextLink])
    local line_colf = ImVec4()
    ImVec4_Copy(line_colf, text_colf)
    do
        -- FIXME-STYLE: Read comments above. This widget is NOT written in the same style as some earlier widgets,
        -- as we are currently experimenting/planning a different styling system.
        local h, s, v = ImGui.ColorConvertRGBtoHSV(text_colf.x, text_colf.y, text_colf.z)
        if held or hovered then
            v = ImSaturate(v + (held and 0.4 or 0.3))
            h = ImFmod(h + 0.02, 1.0)
        end
        text_colf.x, text_colf.y, text_colf.z = ImGui.ColorConvertHSVtoRGB(h, s, v)
        v = ImSaturate(v - 0.20)
        line_colf.x, line_colf.y, line_colf.z = ImGui.ColorConvertHSVtoRGB(h, s, v)
    end

    local line_y = bb.Max.y + ImFloor(g.FontBaked.Descent * g.FontBakedScale * 0.20)
    window.DrawList:AddLineH(bb.Min.x, bb.Max.x, line_y, ImGui.GetColorU32(line_colf), 1.0 * ImTrunc(g.Style._MainScale)) -- FIXME-DPI

    ImGui.PushStyleColor(ImGuiCol.Text, ImGui.GetColorU32(text_colf))
    ImGui.RenderText(bb.Min, label, 1, label_end, false)
    ImGui.PopStyleColor()

    -- IMGUI_TEST_ENGINE_ITEM_INFO(id, label, g.LastItemData.StatusFlags)
    return pressed
end

--- @param label string
--- @param url   string
function ImGui.TextLinkOpenURL(label, url)
    local g = GImGui
    if url == nil then
        url = label
    end
    local pressed = ImGui.TextLink(label)
    if pressed and g.PlatformIO.Platform_OpenInShellFn ~= nil then
        g.PlatformIO.Platform_OpenInShellFn(g, url)
    end

    ImGui.SetItemTooltip(ImGui.LocalizeGetMsg(ImGuiLocKey.OpenLink_s), url)

    if ImGui.BeginPopupContextItem() then
        if ImGui.MenuItem(ImGui.LocalizeGetMsg(ImGuiLocKey.CopyLink)) then
            ImGui.SetClipboardText(url)
        end
        ImGui.EndPopup()
    end

    return pressed
end

----------------------------------------------------------------
-- [SECTION] Low-level Layout helpers
----------------------------------------------------------------

function ImGui.Spacing()
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end
    ImGui.ItemSize(ImVec2(0, 0))
end

--- @param size ImVec2
function ImGui.Dummy(size)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + size)
    ImGui.ItemSize(size)
    ImGui.ItemAdd(bb, 0)
end

function ImGui.NewLine()
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local g = GImGui
    local backup_layout_type = window.DC.LayoutType
    window.DC.LayoutType = ImGuiLayoutType.Vertical
    window.DC.IsSameLine = false

    if window.DC.CurrLineSize.y > 0.0 then
        -- In the event that we are on a line with items that is smaller that FontSize high, we will preserve its height.
        ImGui.ItemSize(ImVec2(0, 0))
    else
        ImGui.ItemSize(ImVec2(0.0, g.FontSize))
    end

    window.DC.LayoutType = backup_layout_type
end

function ImGui.AlignTextToFramePadding()
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local g = GImGui
    window.DC.CurrLineSize.y = ImMax(window.DC.CurrLineSize.y, g.FontSize + g.Style.FramePadding.y * 2)
    window.DC.CurrLineTextBaseOffset = ImMax(window.DC.CurrLineTextBaseOffset, g.Style.FramePadding.y)
end

--- @param flags     ImGuiSeparatorFlags
--- @param thickness float
function ImGui.SeparatorEx(flags, thickness)
    if thickness == nil then thickness = 1.0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    local g = GImGui
    IM_ASSERT(ImIsPowerOfTwo(bit32.band(flags, bit32.bor(ImGuiSeparatorFlags.Horizontal, ImGuiSeparatorFlags.Vertical)))) -- Check that only 1 option is selected
    IM_ASSERT(thickness > 0.0)

    if bit32.band(flags, ImGuiSeparatorFlags.Vertical) ~= 0 then
        -- Vertical separator, for menu bars (use current line height).
        local y1 = window.DC.CursorPos.y
        local y2 = window.DC.CursorPos.y + window.DC.CurrLineSize.y
        local bb = ImRect(ImVec2(window.DC.CursorPos.x, y1), ImVec2(window.DC.CursorPos.x + thickness, y2))
        ImGui.ItemSize(ImVec2(thickness, 0.0))
        if not ImGui.ItemAdd(bb, 0) then
            return
        end

        -- Draw
        window.DrawList:AddRectFilled(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.Separator))
        if g.LogEnabled then
            ImGui.LogText(" |")
        end
    elseif bit32.band(flags, ImGuiSeparatorFlags.Horizontal) ~= 0 then
        -- Horizontal Separator
        local x1 = window.DC.CursorPos.x
        local x2 = window.WorkRect.Max.x

        -- Preserve legacy behavior inside Columns()
        -- Before Tables API happened, we relied on Separator() to span all columns of a Columns() set.
        -- We currently don't need to provide the same feature for tables because tables naturally have border features.
        local columns = (bit32.band(flags, ImGuiSeparatorFlags.SpanAllColumns) ~= 0) and window.DC.CurrentColumns or nil
        if columns then
            x1 = window.Pos.x + window.DC.Indent.x  -- Used to be Pos.x before 2023/10/03
            x2 = window.Pos.x + window.Size.x
            ImGui.PushColumnsBackground()
        end

        -- We don't provide our width to the layout so that it doesn't get feed back into AutoFit
        -- FIXME: This prevents ->CursorMaxPos based bounding box evaluation from working (e.g. TableEndCell)
        local bb = ImRect(ImVec2(x1, window.DC.CursorPos.y), ImVec2(x2, window.DC.CursorPos.y + thickness))
        ImGui.ItemSize(ImVec2(0.0, thickness))

        if ImGui.ItemAdd(bb, 0) then
            -- Draw
            window.DrawList:AddRectFilled(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.Separator))
            if g.LogEnabled then
                ImGui.LogRenderedText(bb.Min, "--------------------------------")
            end
        end

        if columns then
            ImGui.PopColumnsBackground()
            columns.LineMinY = window.DC.CursorPos.y
        end
    end
end

function ImGui.Separator()
    local g = GImGui
    local window = g.CurrentWindow
    if window.SkipItems then
        return
    end

    -- Those flags should eventually be configurable by the user
    local flags
    if window.DC.LayoutType == ImGuiLayoutType.Horizontal then
        flags = ImGuiSeparatorFlags.Vertical
    else
        flags = ImGuiSeparatorFlags.Horizontal
    end

    -- Only applies to legacy Columns() api as they relied on Separator() a lot.
    if window.DC.CurrentColumns then
        flags = bit32.bor(flags, ImGuiSeparatorFlags.SpanAllColumns)
    end

    ImGui.SeparatorEx(flags, ImMax(g.Style.SeparatorSize, 1.0))
end

--- @param id         ImGuiID
--- @param label      string
--- @param label_end? int
--- @param extra_w    float
function ImGui.SeparatorTextEx(id, label, label_end, extra_w)
    local g = GImGui
    local window = g.CurrentWindow
    local style = g.Style

    local label_size = ImGui.CalcTextSize(label, label_end, false)
    local pos = ImVec2(window.DC.CursorPos.x, window.DC.CursorPos.y)
    local padding = style.SeparatorTextPadding

    local separator_thickness = style.SeparatorTextBorderSize
    local min_size = ImVec2(label_size.x + extra_w + padding.x * 2.0, ImMax(label_size.y + padding.y * 2.0, separator_thickness))

    local bb = ImRect(pos, ImVec2(window.WorkRect.Max.x, pos.y + min_size.y))
    local text_baseline_y = ImTrunc((bb:GetHeight() - label_size.y) * style.SeparatorTextAlign.y + 0.999)  -- ImMax(padding.y, ImTrunc((style.SeparatorTextSize - label_size.y) * 0.5f))

    ImGui.ItemSize(min_size, text_baseline_y)
    if not ImGui.ItemAdd(bb, id) then
        return
    end

    local sep1_x1 = pos.x
    local sep2_x2 = bb.Max.x
    local seps_y = ImTrunc((bb.Min.y + bb.Max.y) * 0.5 + 0.999)

    local label_avail_w = ImMax(0.0, sep2_x2 - sep1_x1 - padding.x * 2.0)
    local label_pos = ImVec2(pos.x + padding.x + ImMax(0.0, (label_avail_w - label_size.x - extra_w) * style.SeparatorTextAlign.x), pos.y + text_baseline_y)  -- FIXME-ALIGN

    -- This allows using SameLine() to position something in the 'extra_w'
    window.DC.CursorPosPrevLine.x = label_pos.x + label_size.x

    local separator_col = ImGui.GetColorU32(ImGuiCol.Separator)

    if label_size.x > 0.0 then
        local sep1_x2 = label_pos.x - style.ItemSpacing.x
        local sep2_x1 = label_pos.x + label_size.x + extra_w + style.ItemSpacing.x

        if sep1_x2 > sep1_x1 and separator_thickness > 0.0 then
            window.DrawList:AddLineH(sep1_x1, sep1_x2, seps_y, separator_col, separator_thickness)
        end

        if sep2_x2 > sep2_x1 and separator_thickness > 0.0 then
            window.DrawList:AddLineH(sep2_x1, sep2_x2, seps_y, separator_col, separator_thickness)
        end

        if g.LogEnabled then
            ImGui.LogSetNextTextDecoration("---", nil)
        end

        ImGui.RenderTextEllipsis(window.DrawList, label_pos, ImVec2(bb.Max.x, bb.Max.y + style.ItemSpacing.y), bb.Max.x, label, label_end, label_size)
    else
        if g.LogEnabled then
            ImGui.LogText("---")
        end

        if separator_thickness > 0.0 then
            window.DrawList:AddLineH(sep1_x1, sep2_x2, seps_y, separator_col, separator_thickness)
        end
    end
end

--- @param label string
function ImGui.SeparatorText(label)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return
    end

    ImGui.SeparatorTextEx(0, label, ImGui.FindRenderedTextEnd(label), 0.0)
end

----------------------------------------------------------------
-- [SECTION] COMBO BOX
----------------------------------------------------------------

--- @param items_count float
--- @return float
local function CalcMaxPopupHeightFromItemCount(items_count)
    local g = GImGui
    if items_count <= 0 then
        return FLT_MAX
    end
    return (g.FontSize + g.Style.ItemSpacing.y) * items_count - g.Style.ItemSpacing.y + (g.Style.WindowPadding.y * 2)
end

--- @param label          string
--- @param preview_value? string
--- @param flags?         ImGuiComboFlags
function ImGui.BeginCombo(label, preview_value, flags)
    if flags == nil then flags = 0 end

    local g = GImGui
    local window = ImGui.GetCurrentWindow()

    local backup_next_window_data_flags = g.NextWindowData.HasFlags
    g.NextWindowData:ClearFlags()
    if window.SkipItems then
        return false
    end

    local style = g.Style
    local id = window:GetID(label)
    IM_ASSERT(bit32.band(flags, bit32.bor(ImGuiComboFlags.NoArrowButton, ImGuiComboFlags.NoPreview)) ~= bit32.bor(ImGuiComboFlags.NoArrowButton, ImGuiComboFlags.NoPreview)) -- Can't use both flags together
    if bit32.band(flags, ImGuiComboFlags.WidthFitPreview) ~= 0 then
        IM_ASSERT(bit32.band(flags, bit32.bor(ImGuiComboFlags.NoPreview, ImGuiComboFlags.CustomPreview)) == 0)
    end

    local arrow_size
    if (bit32.band(flags, ImGuiComboFlags.NoArrowButton) ~= 0) then
        arrow_size = 0.0
    else
        arrow_size = ImGui.GetFrameHeight()
    end

    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local preview_width
    if ((bit32.band(flags, ImGuiComboFlags.WidthFitPreview) ~= 0) and (preview_value ~= nil)) then
        preview_width = ImGui.CalcTextSize(preview_value, nil, false).x
    else
        preview_width = 0.0
    end

    local w
    if bit32.band(flags, ImGuiComboFlags.NoPreview) ~= 0 then
        w = arrow_size
    elseif bit32.band(flags, ImGuiComboFlags.WidthFitPreview) ~= 0 then
        w = arrow_size + preview_width + style.FramePadding.x * 2.0
    else
        w = ImGui.CalcItemWidth()
    end

    local bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y * 2.0))
    local label_offset = (label_size.x > 0.0) and (style.ItemInnerSpacing.x + label_size.x) or 0.0
    local total_bb = ImRect(bb.Min, bb.Max + ImVec2(label_offset, 0.0))

    ImGui.ItemSize(total_bb, style.FramePadding.y)
    if not ImGui.ItemAdd(total_bb, id, bb) then
        return false
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id)
    local popup_id = ImHashStr("##ComboPopup", nil, id)
    local popup_open = ImGui.IsPopupOpen(popup_id, ImGuiPopupFlags.None)
    if pressed and not popup_open then
        ImGui.OpenPopupEx(popup_id, ImGuiPopupFlags.None)
        popup_open = true
    end

    -- Render shape
    local frame_col = ImGui.GetColorU32(hovered and ImGuiCol.FrameBgHovered or ImGuiCol.FrameBg)
    local value_x2 = ImMax(bb.Min.x, bb.Max.x - arrow_size)

    ImGui.RenderNavCursor(bb, id)

    if bit32.band(flags, ImGuiComboFlags.NoPreview) == 0 then
        window.DrawList:AddRectFilled(bb.Min, ImVec2(value_x2, bb.Max.y), frame_col, style.FrameRounding, (bit32.band(flags, ImGuiComboFlags.NoArrowButton) ~= 0) and ImDrawFlags.RoundCornersAll or ImDrawFlags.RoundCornersLeft)
    end

    if bit32.band(flags, ImGuiComboFlags.NoArrowButton) == 0 then
        local bg_col = ImGui.GetColorU32((popup_open or hovered) and ImGuiCol.ButtonHovered or ImGuiCol.Button)
        local text_col = ImGui.GetColorU32(ImGuiCol.Text)

        window.DrawList:AddRectFilled(ImVec2(value_x2, bb.Min.y), bb.Max, bg_col, style.FrameRounding, (w <= arrow_size) and ImDrawFlags.RoundCornersAll or ImDrawFlags.RoundCornersRight)

        if value_x2 + arrow_size - style.FramePadding.x <= bb.Max.x then
            ImGui.RenderArrow(window.DrawList, ImVec2(value_x2 + style.FramePadding.y, bb.Min.y + style.FramePadding.y), text_col, ImGuiDir.Down, 1.0)
        end
    end

    ImGui.RenderFrameBorder(bb.Min, bb.Max, style.FrameRounding)

    -- Custom preview
    if bit32.band(flags, ImGuiComboFlags.CustomPreview) ~= 0 then
        g.ComboPreviewData.PreviewRect = ImRect(bb.Min.x, bb.Min.y, value_x2, bb.Max.y)
        IM_ASSERT(preview_value == nil or preview_value == "")
        preview_value = nil
    end

    -- Render preview and label
    if preview_value ~= nil and bit32.band(flags, ImGuiComboFlags.NoPreview) == 0 then
        if g.LogEnabled then
            ImGui.LogSetNextTextDecoration("{", "}")
        end
        ImGui.RenderTextClipped(bb.Min + style.FramePadding, ImVec2(value_x2, bb.Max.y), preview_value, nil, nil)
    end

    if label_size.x > 0 then
        ImGui.RenderText(ImVec2(bb.Max.x + style.ItemInnerSpacing.x, bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
    end

    if not popup_open then
        return false
    end

    g.NextWindowData.HasFlags = backup_next_window_data_flags
    return ImGui.BeginComboPopup(popup_id, bb, flags)
end

--- @param popup_id ImGuiID
--- @param bb       ImRect
--- @param flags    ImGuiComboFlags
function ImGui.BeginComboPopup(popup_id, bb, flags)
    local g = GImGui
    if not ImGui.IsPopupOpen(popup_id, ImGuiPopupFlags.None) then
        g.NextWindowData:ClearFlags()
        return false
    end

    local w = bb:GetWidth()
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSizeConstraint) ~= 0 then
        g.NextWindowData.SizeConstraintRect.Min.x = ImMax(g.NextWindowData.SizeConstraintRect.Min.x, w)
    else
        if bit32.band(flags, ImGuiComboFlags.HeightMask_) == 0 then
            flags = bit32.bor(flags, ImGuiComboFlags.HeightRegular)
        end
        IM_ASSERT(ImIsPowerOfTwo(bit32.band(flags, ImGuiComboFlags.HeightMask_)))
        local popup_max_height_in_items = -1
        if bit32.band(flags, ImGuiComboFlags.HeightRegular) ~= 0 then
            popup_max_height_in_items = 8
        elseif bit32.band(flags, ImGuiComboFlags.HeightSmall) ~= 0 then
            popup_max_height_in_items = 4
        elseif bit32.band(flags, ImGuiComboFlags.HeightLarge) ~= 0 then
            popup_max_height_in_items = 20
        end
        local constraint_min = ImVec2(0.0, 0.0)
        local constraint_max = ImVec2(FLT_MAX, FLT_MAX)
        if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSize) == 0 or g.NextWindowData.SizeVal.x <= 0.0 then
            constraint_min.x = w
        end
        if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSize) == 0 or g.NextWindowData.SizeVal.y <= 0.0 then
            constraint_max.y = CalcMaxPopupHeightFromItemCount(popup_max_height_in_items)
        end
        ImGui.SetNextWindowSizeConstraints(constraint_min, constraint_max)
    end

    -- This is essentially a specialized version of BeginPopupEx()
    local name = ImFormatString("##Combo_%02d", g.BeginComboDepth)

    -- Set position given a custom constraint (peak into expected window size so we can position it)
    -- FIXME: This might be easier to express with an hypothetical SetNextWindowPosConstraints() function?
    -- FIXME: This might be moved to Begin() or at least around the same spot where Tooltips and other Popups are calling FindBestWindowPosForPopupEx()?
    local popup_window = ImGui.FindWindowByName(name)
    if popup_window then
        if popup_window.WasActive then
            -- Always override 'AutoPosLastDirection' to not leave a chance for a past value to affect us.
            local size_expected = ImGui.CalcWindowNextAutoFitSize(popup_window)
            popup_window.AutoPosLastDirection = (bit32.band(flags, ImGuiComboFlags.PopupAlignLeft) ~= 0) and ImGuiDir.Left or ImGuiDir.Down
            local r_outer = ImGui.GetPopupAllowedExtentRect(popup_window)
            local pos
            pos, popup_window.AutoPosLastDirection = ImGui.FindBestWindowPosForPopupEx(bb:GetBL(), size_expected, popup_window.AutoPosLastDirection, r_outer, bb, ImGuiPopupPositionPolicy.ComboBox)
            ImGui.SetNextWindowPos(pos)
        end
    end

    -- We don't use BeginPopupEx() solely because we have a custom name string, which we could make an argument to BeginPopupEx()
    local window_flags = bit32.bor(ImGuiWindowFlags.AlwaysAutoResize, ImGuiWindowFlags.Popup, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoSavedSettings, ImGuiWindowFlags.NoMove)
    ImGui.PushStyleVarX(ImGuiStyleVar.WindowPadding, g.Style.FramePadding.x) -- Horizontally align ourselves with the framed text
    local _, ret = ImGui.Begin(name, nil, window_flags)
    ImGui.PopStyleVar()
    if not ret then
        ImGui.EndPopup()
        if not g.IO.ConfigDebugBeginReturnValueOnce and not g.IO.ConfigDebugBeginReturnValueLoop then
            -- Begin may only return false with those debug tools activated.
            IM_ASSERT(false) -- This should never happen as we tested for IsPopupOpen() above
        end
        return false
    end

    g.BeginComboDepth = g.BeginComboDepth + 1

    return true
end

function ImGui.EndCombo()
    local g = GImGui
    g.BeginComboDepth = g.BeginComboDepth - 1

    local name = ImFormatString("##Combo_%02d", g.BeginComboDepth) -- FIXME: Move those to helpers?

    if g.CurrentWindow.Name ~= name then
        IM_ASSERT_USER_ERROR_RET(false, "Calling EndCombo() in wrong window!")
    end

    ImGui.EndPopup()
end

-- Call directly after the BeginCombo/EndCombo block. The preview is designed to only host non-interactive elements
-- (Experimental, see GitHub issues: #1658, #4168)
function ImGui.BeginComboPreview()
    local g = GImGui
    local window = g.CurrentWindow
    local preview_data = g.ComboPreviewData

    if window.SkipItems or not (bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Visible) ~= 0) then
        return false
    end

    IM_ASSERT(g.LastItemData.Rect.Min.x == preview_data.PreviewRect.Min.x and g.LastItemData.Rect.Min.y == preview_data.PreviewRect.Min.y) -- Didn't call after BeginCombo/EndCombo block or forgot to pass ImGuiComboFlags.CustomPreview flag?

    if not window.ClipRect:Overlaps(preview_data.PreviewRect) then -- Narrower test (optional)
        return false
    end

    -- FIXME: This could be contained in a PushWorkRect() api
    ImVec2_Copy(preview_data.BackupCursorPos, window.DC.CursorPos)
    ImVec2_Copy(preview_data.BackupCursorMaxPos, window.DC.CursorMaxPos)
    ImVec2_Copy(preview_data.BackupCursorPosPrevLine, window.DC.CursorPosPrevLine)
    preview_data.BackupPrevLineTextBaseOffset = window.DC.PrevLineTextBaseOffset
    preview_data.BackupLayout = window.DC.LayoutType

    ImVec2_Copy(window.DC.CursorPos, preview_data.PreviewRect.Min + g.Style.FramePadding)
    ImVec2_Copy(window.DC.CursorMaxPos, window.DC.CursorPos)
    window.DC.LayoutType = ImGuiLayoutType.Horizontal
    window.DC.IsSameLine = false

    ImGui.PushClipRect(preview_data.PreviewRect.Min, preview_data.PreviewRect.Max, true)

    return true
end

function ImGui.EndComboPreview()
    local g = GImGui
    local window = g.CurrentWindow
    local preview_data = g.ComboPreviewData

    local draw_list = window.DrawList
    if window.DC.CursorMaxPos.x < preview_data.PreviewRect.Max.x and window.DC.CursorMaxPos.y < preview_data.PreviewRect.Max.y then
        if draw_list.CmdBuffer.Size > 1 then -- Unlikely case that the PushClipRect() didn't create a command
            ImVec4_Copy(draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size].ClipRect, draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size - 1].ClipRect)
            ImVec4_Copy(draw_list._CmdHeader.ClipRect, draw_list.CmdBuffer.Data[draw_list.CmdBuffer.Size].ClipRect)
            draw_list:_TryMergeDrawCmds()
        end
    end

    ImGui.PopClipRect()

    ImVec2_Copy(window.DC.CursorPos, preview_data.BackupCursorPos)
    ImVec2_Copy(window.DC.CursorMaxPos, ImMax(window.DC.CursorMaxPos, preview_data.BackupCursorMaxPos))
    ImVec2_Copy(window.DC.CursorPosPrevLine, preview_data.BackupCursorPosPrevLine)
    window.DC.PrevLineTextBaseOffset = preview_data.BackupPrevLineTextBaseOffset
    window.DC.LayoutType = preview_data.BackupLayout
    window.DC.IsSameLine = false

    preview_data.PreviewRect = ImRect()
end

-- Getter for the old Combo() API: Lua array of strings (1-based), `idx` is 0-based
local function Items_ArrayGetter(data, idx)
    return data[idx + 1]
end

-- Getter for the old Combo() API: "item1\0item2\0item3\0"
local function Items_SingleStringGetter(data, idx)
    local items_count = 0
    local p = 1
    while p <= #data and string.byte(data, p) ~= 0 do
        local e = string.find(data, "\0", p, true) or (#data + 1)
        if idx == items_count then
            return string.sub(data, p, e - 1)
        end
        p = e + 1
        items_count = items_count + 1
    end
    return nil
end

local function Items_SingleStringCount(data)
    local items_count = 0
    local p = 1
    while p <= #data and string.byte(data, p) ~= 0 do
        p = (string.find(data, "\0", p, true) or #data) + 1
        items_count = items_count + 1
    end
    return items_count
end

-- Normalizes the 3 upstream overloads to (getter, user_data, items_count, height)
-- - (items: string[], items_count?, height?)
-- - (items_separated_by_zeros: string, height?)
-- - (getter: fun(user_data, idx): string?, user_data, items_count, height?)
local function Items_ResolveArgs(a, b, c, d)
    if type(a) == "function" then
        return a, b, c, d
    elseif type(a) == "string" then
        return Items_SingleStringGetter, a, Items_SingleStringCount(a), b
    else
        return Items_ArrayGetter, a, b or #a, c
    end
end

-- Old API, prefer using BeginCombo() nowadays if you can.
--- @param label        string
--- @param current_item int     # 0-based
--- @return int  current_item
--- @return bool value_changed
function ImGui.Combo(label, current_item, a, b, c, d)
    local g = GImGui
    local getter, user_data, items_count, popup_max_height_in_items = Items_ResolveArgs(a, b, c, d)
    if popup_max_height_in_items == nil then popup_max_height_in_items = -1 end

    local preview_value = nil
    if bit32.band(bit32.bor(g.NextItemData.ItemFlagsSet, g.CurrentItemFlags), ImGuiItemFlags.MixedValue) ~= 0 then
        preview_value = ""
    elseif current_item >= 0 and current_item < items_count then
        preview_value = getter(user_data, current_item)
    end

    if popup_max_height_in_items ~= -1 and bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasSizeConstraint) == 0 then
        ImGui.SetNextWindowSizeConstraints(ImVec2(0, 0), ImVec2(FLT_MAX, CalcMaxPopupHeightFromItemCount(popup_max_height_in_items)))
    end

    if not ImGui.BeginCombo(label, preview_value, ImGuiComboFlags.None) then
        return current_item, false
    end

    local value_changed = false
    local clipper = ImGuiListClipper()
    clipper:Begin(items_count)
    clipper:IncludeItemByIndex(current_item)
    while clipper:Step() do
        for i = clipper.DisplayStart, clipper.DisplayEnd - 1 do
            local item_text = getter(user_data, i)
            if item_text == nil then
                item_text = "*Unknown item*"
            end

            ImGui.PushID(i)
            local item_selected = (i == current_item)
            if ImGui.Selectable(item_text, item_selected) and current_item ~= i then
                value_changed = true
                current_item = i
            end
            if item_selected then
                ImGui.SetItemDefaultFocus()
            end
            ImGui.PopID()
        end
    end

    ImGui.EndCombo()
    if value_changed then
        ImGui.MarkItemEdited(g.LastItemData.ID)
    end

    return current_item, value_changed
end

----------------------------------------------------------------
-- [SECTION] DATA TYPE & DATA FORMATTING [Internal]
----------------------------------------------------------------

local function float(val) return val end
local function double(val) return val end

local GDefaultRgbaColorMarkers = {
    IM_COL32(240, 20, 20, 255), IM_COL32(20, 240, 20, 255), IM_COL32(20, 20, 240, 255), IM_COL32(140, 140, 140, 255)
}

--- @param size      size_t
--- @param name      string
--- @param print_fmt string
--- @param scan_fmt  string
--- @return ImGuiDataTypeInfo
--- @nodiscard
--- @package
local function ImGuiDataTypeInfo(size, name, print_fmt, scan_fmt)
    return { Size = size, Name = name, PrintFmt = print_fmt, ScanFmt = scan_fmt }
end

local GDataTypeInfo = {
    ImGuiDataTypeInfo(1, "S8",     "%d",   "%d"),
    ImGuiDataTypeInfo(1, "U8",     "%u",   "%u"),
    ImGuiDataTypeInfo(2, "S16",    "%d",   "%d"),
    ImGuiDataTypeInfo(2, "U16",    "%u",   "%u"),
    ImGuiDataTypeInfo(4, "S32",    "%d",   "%d"),
    ImGuiDataTypeInfo(4, "U32",    "%u",   "%u"),
    ImGuiDataTypeInfo(4, "float",  "%.3f", "%f"),
    ImGuiDataTypeInfo(8, "double", "%f",   "%lf"),
    ImGuiDataTypeInfo(1, "bool",   "%d",   "%d"),
    ImGuiDataTypeInfo(0, "string", "%s",   "%s")
}

--- @param data_type ImGuiDataType
function ImGui.DataTypeGetInfo(data_type)
    IM_ASSERT(data_type >= 0 and data_type < ImGuiDataType.COUNT)
    return GDataTypeInfo[data_type + 1]
end

--- @param buf       char[]
--- @param buf_size  int
--- @param data_type ImGuiDataType
--- @param data      number
--- @param format    string
function ImGui.DataTypeFormatString(buf, buf_size, data_type, data, format)
    local str
    if     data_type == ImGuiDataType.S32 then
        str = ImFormatString(format, (ImS32)(data))
    elseif data_type == ImGuiDataType.U32 then
        str = ImFormatString(format, (ImU32)(data))
    elseif data_type == ImGuiDataType.Float then
        str = ImFormatString(format, data)
    elseif data_type == ImGuiDataType.Double then
        str = ImFormatString(format, data)
    elseif data_type == ImGuiDataType.S8 then
        str = ImFormatString(format, (ImS8)(data))
    elseif data_type == ImGuiDataType.U8 then
        str = ImFormatString(format, (ImU8)(data))
    elseif data_type == ImGuiDataType.S16 then
        str = ImFormatString(format, (ImS16)(data))
    elseif data_type == ImGuiDataType.U16 then
        str = ImFormatString(format, (ImU16)(data))
    else
        IM_ASSERT(false)
    end
    ImStd.ImStrncpy(buf, 1, { string.byte(str, 1, #str) }, 1, ImMin(#str + 1, buf_size)) -- TODO: update this when new ImFormatString is implemented
end

--- @param data_type ImGuiDataType
--- @param op        int
--- @param arg1      number
--- @param arg2      number
function ImGui.DataTypeApplyOp(data_type, op, arg1, arg2)
    IM_ASSERT(op == 43 or op == 45) -- '+' or '-'

    if data_type == ImGuiDataType.S8 then
        if op == 43 then
            return ImAddClampOverflow(arg1, arg2, IM_S8_MIN, IM_S8_MAX)
        elseif op == 45 then
            return ImSubClampOverflow(arg1, arg2, IM_S8_MIN, IM_S8_MAX)
        end
    elseif data_type == ImGuiDataType.U8 then
        if op == 43 then
            return ImAddClampOverflow(arg1, arg2, IM_U8_MIN, IM_U8_MAX)
        elseif op == 45 then
            return ImSubClampOverflow(arg1, arg2, IM_U8_MIN, IM_U8_MAX)
        end
    elseif data_type == ImGuiDataType.S16 then
        if op == 43 then
            return ImAddClampOverflow((ImS16)(arg1), (ImS16)(arg2), IM_S16_MIN, IM_S16_MAX)
        elseif op == 45 then
            return ImSubClampOverflow((ImS16)(arg1), (ImS16)(arg2), IM_S16_MIN, IM_S16_MAX)
        end
    elseif data_type == ImGuiDataType.U16 then
        if op == 43 then
            return ImAddClampOverflow((ImU16)(arg1), (ImU16)(arg2), IM_U16_MIN, IM_U16_MAX)
        elseif op == 45 then
            return ImSubClampOverflow((ImU16)(arg1), (ImU16)(arg2), IM_U16_MIN, IM_U16_MAX)
        end
    elseif data_type == ImGuiDataType.S32 then
        if op == 43 then
            return ImAddClampOverflow(arg1, arg2, IM_S32_MIN, IM_S32_MAX)
        elseif op == 45 then
            return ImSubClampOverflow(arg1, arg2, IM_S32_MIN, IM_S32_MAX)
        end
    elseif data_type == ImGuiDataType.U32 then
        if op == 43 then
            return ImAddClampOverflow(arg1, arg2, IM_U32_MIN, IM_U32_MAX)
        elseif op == 45 then
            return ImSubClampOverflow(arg1, arg2, IM_U32_MIN, IM_U32_MAX)
        end
    elseif data_type == ImGuiDataType.Float then
        if op == 43 then
            return arg1 + arg2
        elseif op == 45 then
            return arg1 - arg2
        end
    elseif data_type == ImGuiDataType.Double then
        if op == 43 then
            return arg1 + arg2
        elseif op == 45 then
            return arg1 - arg2
        end
    end

    IM_ASSERT(false)
end

local ImParseFormatSanitizeForScanning

--- @param buf              char[]
--- @param data_type        ImGuiDataType
--- @param data             number
--- @param format           string
--- @param data_when_empty? number
function ImGui.DataTypeApplyFromText(buf, data_type, data, format, data_when_empty)
    local type_info = ImGui.DataTypeGetInfo(data_type)
    local data_backup = data

    local p = 1
    while ImCharIsBlankA(buf[p]) do
        p = p + 1
    end
    if buf[p] == 0 then
        if data_when_empty ~= nil then
            data = data_when_empty
            return data, data_backup ~= data
        end
        return data, false
    end

    local format_sanitized, format_sanitized_size = {}, 32
    if (data_type == ImGuiDataType.Float or data_type == ImGuiDataType.Double) then
        format = type_info.ScanFmt
    else
        format = ImParseFormatSanitizeForScanning(format, format_sanitized, format_sanitized_size)
        if format[1] == 0 then
            format = type_info.ScanFmt
        end
    end

    local v32 = 0
    local res = {}
    if ImStd.sscanf(buf, 1, format, res) < 1 then
        return data, false
    end
    if type_info.Size >= 4 then
        data = res[1]
    else
        v32 = res[1]
    end

    if type_info.Size < 4 then
        if data_type == ImGuiDataType.S8 then
            data = (ImS8)(ImClamp(v32, IM_S8_MIN, IM_S8_MAX))
        elseif data_type == ImGuiDataType.U8 then
            data = (ImU8)(ImClamp(v32, IM_U8_MIN, IM_U8_MAX))
        elseif data_type == ImGuiDataType.S16 then
            data = (ImS16)(ImClamp(v32, IM_S16_MIN, IM_S16_MAX))
        elseif data_type == ImGuiDataType.U16 then
            data = (ImU16)(ImClamp(v32, IM_U16_MIN, IM_U16_MAX))
        else
            IM_ASSERT(false)
        end
    end

    return data, data_backup ~= data
end

--- @generic T : number
--- @param lhs T
--- @param rhs T
local function DataTypeCompareT(lhs, rhs)
    if lhs < rhs then return -1 end
    if lhs > rhs then return  1 end
    return 0
end

--- @param data_type ImGuiDataType
--- @param arg1      number
--- @param arg2      number
function ImGui.DataTypeCompare(data_type, arg1, arg2)
    if     data_type == ImGuiDataType.S8  then return DataTypeCompareT((ImS8)(arg1), (ImS8)(arg2))
    elseif data_type == ImGuiDataType.U8  then return DataTypeCompareT((ImU8)(arg1), (ImU8)(arg2))
    elseif data_type == ImGuiDataType.S16 then return DataTypeCompareT((ImS16)(arg1), (ImS16)(arg2))
    elseif data_type == ImGuiDataType.U16 then return DataTypeCompareT((ImU16)(arg1), (ImU16)(arg2))
    elseif data_type == ImGuiDataType.S32 then return DataTypeCompareT((ImS32)(arg1), (ImS32)(arg2))
    elseif data_type == ImGuiDataType.U32 then return DataTypeCompareT((ImU32)(arg1), (ImU32)(arg2))
    elseif data_type == ImGuiDataType.Float  then return DataTypeCompareT(arg1, arg2)
    elseif data_type == ImGuiDataType.Double then return DataTypeCompareT(arg1, arg2)
    end
    IM_ASSERT(false)
    return 0
end

--- @generic T : number
--- @param v      T
--- @param v_min? T
--- @param v_max? T
--- @return T, boolean
local function DataTypeClampT(v, v_min, v_max)
    if v_min and v < v_min then return v_min, true end
    if v_max and v > v_max then return v_max, true end
    return v, false
end

--- @param data_type ImGuiDataType
--- @param data      number
--- @param min?      number
--- @param max?      number
function ImGui.DataTypeClamp(data_type, data, min, max)
    if     data_type == ImGuiDataType.S8  then return DataTypeClampT((ImS8)(data),  min and (ImS8)(min),  max and (ImS8)(max))
    elseif data_type == ImGuiDataType.U8  then return DataTypeClampT((ImU8)(data),  min and (ImU8)(min),  max and (ImU8)(max))
    elseif data_type == ImGuiDataType.S16 then return DataTypeClampT((ImS16)(data), min and (ImS16)(min), max and (ImS16)(max))
    elseif data_type == ImGuiDataType.U16 then return DataTypeClampT((ImU16)(data), min and (ImU16)(min), max and (ImU16)(max))
    elseif data_type == ImGuiDataType.S32 then return DataTypeClampT((ImS32)(data), min and (ImS32)(min), max and (ImS32)(max))
    elseif data_type == ImGuiDataType.U32 then return DataTypeClampT((ImU32)(data), min and (ImU32)(min), max and (ImU32)(max))
    elseif data_type == ImGuiDataType.Float  then return DataTypeClampT(data, min, max)
    elseif data_type == ImGuiDataType.Double then return DataTypeClampT(data, min, max)
    end
    IM_ASSERT(false)
    return data, false
end

--- @param data_type ImGuiDataType
--- @param data      number
function ImGui.DataTypeIsZero(data_type, data)
    local g = GImGui
    return ImGui.DataTypeCompare(data_type, data, g.DataTypeZeroValue) == 0
end

local GetMinimumStepAtDecimalPrecision do

local min_steps = { 1.0, 0.1, 0.01, 0.001, 0.0001, 0.00001, 0.000001, 0.0000001, 0.00000001, 0.000000001 }

--- @param decimal_precision int
--- @return float
function GetMinimumStepAtDecimalPrecision(decimal_precision)
    if decimal_precision < 0 then
        return FLT_MIN
    end
    if decimal_precision < #min_steps then
        return min_steps[decimal_precision + 1]
    else
        return ImPow(10.0, -decimal_precision)
    end
end

end

local ImParseFormatFindStart

--- @param format    string
--- @param data_type ImGuiDataType
--- @param v         number
function ImGui.RoundScalarWithFormatT(format, data_type, v)
    -- IM_UNUSED(data_type)
    IM_ASSERT(data_type == ImGuiDataType.Float or data_type == ImGuiDataType.Double)
    local fmt_start = ImParseFormatFindStart(format)
    if string.byte(format, fmt_start) ~= 37 or string.byte(format, fmt_start + 1) == 37 then
        return v -- Don't apply if the value is not visible in the format string
    end

    -- TODO: Sanitize format

    local str = ImFormatString(format, v)

    v = ImAtof(str) or v
    return v
end

----------------------------------------------------------------
-- [SECTION] INPUTXXX
----------------------------------------------------------------

--- @param fmt string
function ImParseFormatFindStart(fmt)
    local len = #fmt
    local i = 1
    local c
    while i < len do
        c = string.byte(fmt, i)
        if c == 37 and string.byte(fmt, i + 1) ~= 37 then -- '%'
            return i
        elseif c == 37 then
            i = i + 1
        end
        i = i + 1
    end
    return nil
end

--- @param fmt string
--- @param pos int
local function ImParseFormatFindEnd(fmt, pos)
    -- Printf/scanf types modifiers: I/L/h/j/l/t/w/z. Other uppercase letters qualify as types aka end of the format
    if string.byte(fmt, pos) ~= 37 then -- '%'
        return pos
    end
    local ignored_uppercase_mask = bit32.bor(bit32.lshift(1, 73 - 65), bit32.lshift(1, 76 - 65))
    local ignored_lowercase_mask = bit32.bor(bit32.lshift(1, 104 - 97), bit32.lshift(1, 106 - 97), bit32.lshift(1, 108 - 97), bit32.lshift(1, 116 - 97), bit32.lshift(1, 119 - 97), bit32.lshift(1, 122 - 97))
    local len = #fmt
    local c
    for i = pos, len do
        c = string.byte(fmt, i)
        if c >= 65 and c <= 90 and (bit32.band(bit32.lshift(1, c - 65), ignored_uppercase_mask) == 0) then
            return i + 1
        end
        if c >= 97 and c <= 122 and (bit32.band(bit32.lshift(1, c - 97), ignored_lowercase_mask) == 0) then
            return i + 1
        end
    end
    return len + 1
end

-- TODO: temporary patch. does not look good
--- @param fmt string
local function ImParseFormatTrimDecorations(fmt)
    local fmt_start = ImParseFormatFindStart(fmt)
    if string.byte(fmt, fmt_start) ~= 37 then -- '%'
        return ""
    end
    --- @cast fmt_start int
    local fmt_end = ImParseFormatFindEnd(fmt, fmt_start)
    if string.byte(fmt, fmt_end) ~= 37 then
        return string.sub(fmt, fmt_start)
    end
    return string.sub(fmt, fmt_start, fmt_end)
end

--- @param fmt_in       string
--- @param fmt_out      char[]
--- @param fmt_out_size size_t
function ImParseFormatSanitizeForScanning(fmt_in, fmt_out, fmt_out_size)
    local fmt_end = ImParseFormatFindEnd(fmt_in, 1)
    -- IM_UNUSED(fmt_out_size)
    IM_ASSERT(fmt_end < fmt_out_size)
    local has_type = false
    local fmt_in_begin = 1
    local fmt_out_begin = 1
    while fmt_in_begin < fmt_end do
        repeat
        local c = string.byte(fmt_in, fmt_in_begin, fmt_in_begin)
        fmt_in_begin = fmt_in_begin + 1

        if (not has_type and ((c >= 48 and c <= 57) or c == 46 or c == 43 or c == 35)) then
            break
        end

        has_type = has_type or ((c >= 97 and c <= 122) or (c >= 65 and c <= 90))
        if c ~= 39 and c ~= 36 and c ~= 95 then
            fmt_out[fmt_out_begin] = c
            fmt_out_begin = fmt_out_begin + 1
        end

        until true
    end
    -- fmt_out[fmt_out_begin] = 0
    return string.char(unpack(fmt_out)) -- FIXME: not ideal
end

--- @param str string
--- @param pos int
local function ImAtoi(str, pos)
    local negative = false
    if string.byte(str, pos) == 45 then -- '-'
        negative = true
        pos = pos + 1
    end
    if string.byte(str, pos) == 43 then -- '+'
        pos = pos + 1
    end
    local len = #str
    local v = 0
    local c = string.byte(str, pos)
    while c >= 48 and c <= 57 do
        v = v * 10 + c - 48
        pos = pos + 1
        c = string.byte(str, pos)
        if pos > len then break end
    end
    return negative and -v or v, pos
end

--- @param fmt               string
--- @param default_precision int
local function ImParseFormatPrecision(fmt, default_precision)
    local pos = ImParseFormatFindStart(fmt)
    if not pos then
        return default_precision
    end
    pos = pos + 1
    local len = #fmt
    local c = string.byte(fmt, pos)
    while c >= 48 and c <= 57 do
        pos = pos + 1
        c = string.byte(fmt, pos)
        if pos > len then break end
    end
    local precision = INT_MAX
    if c == 46 then -- '.'
        precision, pos = ImAtoi(fmt, pos + 1)
        if precision < 0 or precision > 99 then
            precision = default_precision
        end
    end
    c = string.byte(fmt, pos)
    if c == 101 or c == 69 then -- Maximum precision with scientific notation
        precision = -1
    end
    if (c == 103 or c == 71) and precision == INT_MAX then
        precision = -1
    end
    return (precision == INT_MAX) and default_precision or precision
end

--- @param bb        ImRect
--- @param id        ImGuiID
--- @param label     string
--- @param buf       char[]
--- @param buf_size  int
--- @param flags?    ImGuiInputTextFlags
--- @param callback? ImGuiInputTextCallback
--- @param user_data any
function ImGui.TempInputText(bb, id, label, buf, buf_size, flags, callback, user_data)
    if flags == nil then flags = 0 end

    local g = GImGui
    local window = g.CurrentWindow

    local is_deactivated = (g.InputTextDeactivatedState.ID == id)
    local is_active = (g.TempInputId == id)
    if (not is_active and not is_deactivated) then
        ImGui.ClearActiveID()
    end

    local backup_pos = ImVec2()
    ImVec2_Copy(backup_pos, window.DC.CursorPos)
    ImVec2_Copy(window.DC.CursorPos, bb.Min)
    g.LastItemData.ItemFlags = bit32.bor(g.LastItemData.ItemFlags, ImGuiItemFlags.AllowDuplicateId)
    local value_changed = ImGui.InputTextEx(label, nil, buf, buf_size, bb:GetSize(), bit32.bor(flags, ImGuiInputTextFlags.TempInput, ImGuiInputTextFlags.AutoSelectAll), callback, user_data)
    ImGui.KeepAliveID(id)
    if (not is_active and not is_deactivated) then
        IM_ASSERT(g.ActiveId == id)
        g.TempInputId = g.ActiveId
    end
    if is_active and g.ActiveId ~= id then
        g.TempInputId = 0
    end
    ImVec2_Copy(window.DC.CursorPos, backup_pos)

    return value_changed
end

--- @param bb         ImRect
--- @param id         ImGuiID
--- @param label      string
--- @param data_type  ImGuiDataType
--- @param data       number
--- @param format     string
--- @param clamp_min? number
--- @param clamp_max? number
function ImGui.TempInputScalar(bb, id, label, data_type, data, format, clamp_min, clamp_max)
    local g = GImGui
    local type_info = ImGui.DataTypeGetInfo(data_type)
    local data_buf, data_buf_size = {}, 32
    format = ImParseFormatTrimDecorations(format)
    if format == "" then
        format = type_info.PrintFmt
    end
    ImGui.DataTypeFormatString(data_buf, data_buf_size, data_type, data, format)
    ImStd.ImStrTrimBlanks(data_buf)

    local flags = bit32.bor(ImGuiInputTextFlags.AutoSelectAll, ImGuiInputTextFlags.LocalizeDecimalPoint)
    g.LastItemData.ItemFlags = bit32.bor(g.LastItemData.ItemFlags, ImGuiItemFlags.NoMarkEdited)
    g.LastItemData.ItemFlags = (bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.LiveEditOnInputScalar) ~= 0) and bit32.bor(g.LastItemData.ItemFlags, ImGuiItemFlags.LiveEditOnInputText) or bit32.band(g.LastItemData.ItemFlags, bit32.bnot(ImGuiItemFlags.LiveEditOnInputText))
    if not ImGui.TempInputText(bb, id, label, data_buf, data_buf_size, flags) then
        return data, false
    end

    local data_backup = data

    data = ImGui.DataTypeApplyFromText(data_buf, data_type, data, format, nil)
    if clamp_min or clamp_max then
        if clamp_min and clamp_max and ImGui.DataTypeCompare(data_type, clamp_min, clamp_max) > 0 then
            clamp_min, clamp_max = clamp_max, clamp_min
        end
        data = ImGui.DataTypeClamp(data_type, data, clamp_min, clamp_max)
    end

    g.LastItemData.ItemFlags = bit32.band(g.LastItemData.ItemFlags, bit32.bnot(ImGuiItemFlags.NoMarkEdited))
    local value_changed = data_backup ~= data
    if value_changed then
        ImGui.MarkItemEdited(id)
    end

    return data, value_changed
end

--- @param label      string
--- @param data_type  ImGuiDataType
--- @param data       number
--- @param step?      number
--- @param step_fast? number
--- @param format?    string
--- @param flags?     ImGuiInputTextFlags
function ImGui.InputScalar(label, data_type, data, step, step_fast, format, flags)
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return data, false
    end

    local g = GImGui
    local style = g.Style

    if format == nil then
        format = ImGui.DataTypeGetInfo(data_type).PrintFmt
    end

    local data_default = (bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasRefVal) ~= 0) and g.NextItemData.RefVal or g.DataTypeZeroValue

    local buf, buf_size = {}, 64 -- TODO: IM_COUNTOF()
    if bit32.band(flags, ImGuiInputTextFlags.DisplayEmptyRefVal) ~= 0 and ImGui.DataTypeCompare(data_type, data, data_default) == 0 then
        buf[1] = 0
    else
        ImGui.DataTypeFormatString(buf, buf_size, data_type, data, format)
    end

    g.NextItemData.ItemFlagsSet = bit32.bor(g.NextItemData.ItemFlagsSet, ImGuiItemFlags.NoMarkEdited)
    flags = bit32.bor(flags, ImGuiInputTextFlags.AutoSelectAll, ImGuiInputTextFlags.LocalizeDecimalPoint)

    local has_step_buttons = (step ~= nil)
    local button_size = has_step_buttons and ImGui.GetFrameHeight() or 0.0
    local ret
    if has_step_buttons then
        ImGui.BeginGroup()
        ImGui.PushID(label)
        ImGui.SetNextItemWidth(ImMax(1.0, ImGui.CalcItemWidth() - (button_size + style.ItemInnerSpacing.x) * 2))
        ret = ImGui.InputText("", buf, buf_size, flags)
        -- IMGUI_TEST_ENGINE_ITEM_INFO()
    else
        ret = ImGui.InputText(label, buf, buf_size, flags)
    end

    local value_changed = false
    if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.LiveEditOnInputScalar) ~= 0 then
        local input_edited = bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.EditedInternal) ~= 0
        if input_edited then
            data, value_changed = ImGui.DataTypeApplyFromText(buf, data_type, data, format, bit32.band(flags, ImGuiInputTextFlags.ParseEmptyRefVal) ~= 0 and data_default or nil)
        end
    else
        -- g.LastItemData.StatusFlags &= ~ImGuiItemStatusFlags_Edited
        if (g.DeactivatedItemData.ID == g.LastItemData.ID) then
            -- g.DeactivatedItemData.HasBeenEditedBefore = false; // Will be set below by MarkItemEdited()
            -- if (IsItemDeactivated()) // Should be unnecessary
            data, value_changed = ImGui.DataTypeApplyFromText(buf, data_type, data, format, bit32.band(flags, ImGuiInputTextFlags.ParseEmptyRefVal) ~= 0 and data_default or nil)
        end
    end

    if has_step_buttons then
        local backup_frame_padding = ImVec2()
        ImVec2_Copy(backup_frame_padding, style.FramePadding)
        style.FramePadding.x = style.FramePadding.y
        if bit32.band(flags, ImGuiInputTextFlags.ReadOnly) ~= 0 then
            ImGui.BeginDisabled()
        end
        ImGui.PushItemFlag(ImGuiItemFlags.ButtonRepeat, true)
        ImGui.SameLine(0, style.ItemInnerSpacing.x)
        --- @cast step number
        if ImGui.ButtonEx("-", ImVec2(button_size, button_size)) then
            data = ImGui.DataTypeApplyOp(data_type, 45, data, ((g.IO.KeyCtrl and step_fast) and step_fast or step))
            value_changed = true
            ret = true
        end
        ImGui.SameLine(0, style.ItemInnerSpacing.x)
        if ImGui.ButtonEx("+", ImVec2(button_size, button_size)) then
            data = ImGui.DataTypeApplyOp(data_type, 43, data, ((g.IO.KeyCtrl and step_fast) and step_fast or step))
            value_changed = true
            ret = true
        end
        ImGui.PopItemFlag()
        if bit32.band(flags, ImGuiInputTextFlags.ReadOnly) ~= 0 then
            ImGui.EndDisabled()
        end
        local label_end = ImGui.FindRenderedTextEnd(label)
        if label_end ~= 1 then
            ImGui.SameLine(0, style.ItemInnerSpacing.x)
            ImGui.TextEx(label, label_end)
        end
        ImVec2_Copy(style.FramePadding, backup_frame_padding)

        ImGui.PopID()
        ImGui.EndGroup()
    end

    g.LastItemData.ItemFlags = bit32.band(g.LastItemData.ItemFlags, bit32.bnot(ImGuiItemFlags.NoMarkEdited))
    if value_changed then
        ImGui.MarkItemEdited(g.LastItemData.ID)
    end

    if bit32.band(flags, ImGuiInputTextFlags.EnterReturnsTrue) ~= 0 then
        return data, ret
    end
    return data, value_changed
end

--- @param label      string
--- @param data_type  ImGuiDataType
--- @param data       number[]
--- @param components int
--- @param step?      number
--- @param step_fast? number
--- @param format?    string
--- @param flags?     ImGuiInputTextFlags
function ImGui.InputScalarN(label, data_type, data, components, step, step_fast, format, flags)
    if flags == nil then flags = 0 end
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local value_changed = false
    ImGui.BeginGroup()
    ImGui.PushID(label)
    ImGui.PushMultiItemsWidths(components, ImGui.CalcItemWidth())
    for i = 1, components do
        ImGui.PushID(i - 1)
        if i > 1 then
            ImGui.SameLine(0, g.Style.ItemInnerSpacing.x)
        end
        local changed
        data[i], changed = ImGui.InputScalar("", data_type, data[i], step, step_fast, format, flags)
        if changed then
            value_changed = true
        end
        ImGui.PopID()
        ImGui.PopItemWidth()
    end
    ImGui.PopID()

    local label_end = ImGui.FindRenderedTextEnd(label)
    if label_end > 1 then
        ImGui.SameLine(0.0, g.Style.ItemInnerSpacing.x)
        ImGui.TextEx(label, label_end)
    end

    ImGui.EndGroup()
    return value_changed
end

--- @param label   string
--- @param v       [float, float, float]
--- @param format? string
--- @param flags?  ImGuiInputTextFlags
function ImGui.InputFloat3(label, v, format, flags)
    if format == nil then format = "%.3f" end

    return ImGui.InputScalarN(label, ImGuiDataType.Float, v, 3, nil, nil, format, flags)
end

function ImGui.InputFloat2(label, v, format, flags)
    return ImGui.InputScalarN(label, ImGuiDataType.Float, v, 2, nil, nil, format or "%.3f", flags)
end

function ImGui.InputFloat4(label, v, format, flags)
    return ImGui.InputScalarN(label, ImGuiDataType.Float, v, 4, nil, nil, format or "%.3f", flags)
end

function ImGui.InputInt2(label, v, flags)
    return ImGui.InputScalarN(label, ImGuiDataType.S32, v, 2, nil, nil, "%d", flags)
end

function ImGui.InputInt3(label, v, flags)
    return ImGui.InputScalarN(label, ImGuiDataType.S32, v, 3, nil, nil, "%d", flags)
end

function ImGui.InputInt4(label, v, flags)
    return ImGui.InputScalarN(label, ImGuiDataType.S32, v, 4, nil, nil, "%d", flags)
end

--- @param label      string
--- @param v          int
--- @param step?      int
--- @param step_fast? int
--- @param flags?     ImGuiInputTextFlags
function ImGui.InputInt(label, v, step, step_fast, flags)
    if step      == nil then step      = 1   end
    if step_fast == nil then step_fast = 100 end
    if flags     == nil then flags     = 0   end

    local format = (bit32.band(flags, ImGuiInputTextFlags.CharsHexadecimal) ~= 0) and "%08X" or "%d"
    return ImGui.InputScalar(label, ImGuiDataType.S32, v, (step > 0) and step or nil, (step_fast > 0) and step_fast or nil, format, flags)
end

--- @param label      string
--- @param v          float
--- @param step?      float
--- @param step_fast? float
--- @param format?    string
--- @param flags?     ImGuiInputTextFlags
function ImGui.InputFloat(label, v, step, step_fast, format, flags)
    if step      == nil then step      = .0     end
    if step_fast == nil then step_fast = .0     end
    if format    == nil then format    = "%.3f" end

    return ImGui.InputScalar(label, ImGuiDataType.Float, v, (step > 0.0 and step or nil), (step_fast > 0.0 and step_fast or nil), format, flags)
end

--- @param label      string
--- @param v          double
--- @param step?      double
--- @param step_fast? double
--- @param format?    string
--- @param flags?     ImGuiInputTextFlags
function ImGui.InputDouble(label, v, step, step_fast, format, flags)
    if step      == nil then step      = .0     end
    if step_fast == nil then step_fast = .0     end
    if format    == nil then format    = "%.6f" end

    return ImGui.InputScalar(label, ImGuiDataType.Double, v, (step > 0.0 and step or nil), (step_fast > 0.0 and step_fast or nil), format, flags)
end

----------------------------------------------------------------
-- [SECTION] DRAGXXX
----------------------------------------------------------------

-- This is called by DragBehavior() when the widget is active (held by mouse or being manipulated with Nav controls)
--- @generic T : number
--- @param TYPE       fun(val: number): T
--- @param SIGNEDTYPE fun(val: number): T
--- @param data_type  ImGuiDataType
--- @param v          T
--- @param v_speed    float
--- @param v_min      T
--- @param v_max      T
--- @param format     string
--- @param flags      ImGuiSliderFlags
--- @return T    new_v   # Updated `v`
--- @return bool changed
function ImGui.DragBehaviorT(TYPE, SIGNEDTYPE, data_type, v, v_speed, v_min, v_max, format, flags)
    local g = GImGui
    local axis = (bit32.band(flags, ImGuiSliderFlags.Vertical) ~= 0) and ImGuiAxis.Y or ImGuiAxis.X
    local is_bounded = (v_min < v_max) or ((v_min == v_max) and (v_min ~= 0.0 or (bit32.band(flags, ImGuiSliderFlags.ClampZeroRange) ~= 0)))
    local is_wrapped = is_bounded and (bit32.band(flags, ImGuiSliderFlags.WrapAround) ~= 0)
    local is_logarithmic = bit32.band(flags, ImGuiSliderFlags.Logarithmic) ~= 0
    local is_floating_point = (data_type == ImGuiDataType.Float) or (data_type == ImGuiDataType.Double)

    -- Default tweak speed
    if v_speed == 0.0 and is_bounded and (v_max - v_min < math.huge) then
        v_speed = (v_max - v_min) * g.DragSpeedDefaultRatio
    end

    -- Inputs accumulates into g.DragCurrentAccum, which is flushed into the current value as soon as it makes a difference with our precision settings
    local adjust_delta = 0.0
    if g.ActiveIdSource == ImGuiInputSource.Mouse and ImGui.IsMousePosValid() and ImGui.IsMouseDragPastThreshold(0, g.IO.MouseDragThreshold * DRAG_MOUSE_THRESHOLD_FACTOR) then
        adjust_delta = g.IO.MouseDelta[axis]
        if g.IO.KeyAlt and bit32.band(flags, ImGuiSliderFlags.NoSpeedTweaks) == 0 then
            adjust_delta = adjust_delta / 100.0
        end
        if g.IO.KeyShift and bit32.band(flags, ImGuiSliderFlags.NoSpeedTweaks) == 0 then
            adjust_delta = adjust_delta * 10.0
        end
    elseif g.ActiveIdSource == ImGuiInputSource.Keyboard or g.ActiveIdSource == ImGuiInputSource.Gamepad then
        local decimal_precision
        if is_floating_point then
            decimal_precision = ImParseFormatPrecision(format, 3)
        else
            decimal_precision = 0
        end
        local slow_key = (g.NavInputSource == ImGuiInputSource.Gamepad) and ImGuiKey.NavGamepadTweakSlow or ImGuiKey.NavKeyboardTweakSlow
        local fast_key = (g.NavInputSource == ImGuiInputSource.Gamepad) and ImGuiKey.NavGamepadTweakFast or ImGuiKey.NavKeyboardTweakFast

        local tweak_factor
        if bit32.band(flags, ImGuiSliderFlags.NoSpeedTweaks) ~= 0 then
            tweak_factor = 1.0
        elseif ImGui.IsKeyDown(slow_key) then
            tweak_factor = 1.0 / 10.0
        elseif ImGui.IsKeyDown(fast_key) then
            tweak_factor = 10.0
        else
            tweak_factor = 1.0
        end

        adjust_delta = ImGui.GetNavTweakPressedAmount(axis) * tweak_factor
        v_speed = ImMax(v_speed, GetMinimumStepAtDecimalPrecision(decimal_precision))
    end
    adjust_delta = adjust_delta * v_speed

    -- For vertical drag we currently assume that Up=higher value (like we do with vertical sliders). This may become a parameter
    if axis == ImGuiAxis.Y then
        adjust_delta = -adjust_delta
    end

    -- For logarithmic use our range is effectively 0..1 so scale the delta into that range
    if is_logarithmic and (v_max - v_min < FLT_MAX) and (v_max - v_min > 0.000001) then  -- Epsilon to avoid /0
        adjust_delta = adjust_delta / (v_max - v_min)
    end

    -- Clear current value on activation
    -- Avoid altering values and clamping when we are _already_ past the limits and heading in the same direction, so e.g. if range is 0..255, current value is 300 and we are pushing to the right side, keep the 300.
    local is_just_activated = g.ActiveIdIsJustActivated
    local is_already_past_limits_and_pushing_outward = is_bounded and not is_wrapped and ((v >= v_max and adjust_delta > 0.0) or (v <= v_min and adjust_delta < 0.0))
    if is_just_activated or is_already_past_limits_and_pushing_outward then
        g.DragCurrentAccum = 0.0
        g.DragCurrentAccumDirty = false
    elseif adjust_delta ~= 0.0 then
        g.DragCurrentAccum = g.DragCurrentAccum + adjust_delta
        g.DragCurrentAccumDirty = true
    end

    if not g.DragCurrentAccumDirty then
        return v, false
    end

    local v_cur = (TYPE)(v)
    local v_old_ref_for_accum_remainder = 0.0

    local logarithmic_zero_epsilon = 0.0 -- Only valid when is_logarithmic is true
    local zero_deadzone_halfsize = 0.0 -- Drag widgets have no deadzone (as it doesn't make sense)
    if is_logarithmic then
        -- When using logarithmic sliders, we need to clamp to avoid hitting zero, but our choice of clamp value greatly affects slider precision. We attempt to use the specified precision to estimate a good lower bound.
        local decimal_precision
        if is_floating_point then
            decimal_precision = ImParseFormatPrecision(format, 3)
        else
            decimal_precision = 1
        end
        logarithmic_zero_epsilon = ImPow(0.1, decimal_precision)

        -- Convert to parametric space, apply delta, convert back
        local v_old_parametric = ImGui.ScaleRatioFromValueT(data_type, v_cur, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)
        local v_new_parametric = v_old_parametric + g.DragCurrentAccum
        v_cur = ImGui.ScaleValueFromRatioT(TYPE, SIGNEDTYPE, data_type, v_new_parametric, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)
        v_old_ref_for_accum_remainder = v_old_parametric
    else
        v_cur = (TYPE)(v_cur + (SIGNEDTYPE)(g.DragCurrentAccum))
    end

    -- Round to user desired precision based on format string
    if is_floating_point and bit32.band(flags, ImGuiSliderFlags.NoRoundToFormat) == 0 then
        v_cur = ImGui.RoundScalarWithFormatT(format, data_type, v_cur)
    end

    -- Preserve remainder after rounding has been applied. This also allow slow tweaking of values
    g.DragCurrentAccumDirty = false
    if is_logarithmic then
        -- Convert to parametric space, apply delta, convert back
        local v_new_parametric = ImGui.ScaleRatioFromValueT(data_type, v_cur, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)
        g.DragCurrentAccum = g.DragCurrentAccum - (v_new_parametric - v_old_ref_for_accum_remainder)
    else
        g.DragCurrentAccum = g.DragCurrentAccum - ((SIGNEDTYPE)(v_cur) - (SIGNEDTYPE)(v))
    end

    -- This does nothing
    if v_cur == (TYPE)(-0) then
        v_cur = (TYPE)(0)
    end

    if v ~= v_cur and is_bounded then
        if is_wrapped then
            -- Wrap values
            if v_cur < v_min then
                v_cur = (TYPE)(v_cur + (TYPE)((TYPE)(v_max - v_min) + (is_floating_point and 0 or 1)))
            end
            if v_cur > v_max then
                v_cur = (TYPE)(v_cur - (TYPE)((TYPE)(v_max - v_min) - (is_floating_point and 0 or 1)))
            end
        else
            -- Clamp values + handle overflow/wrap-around for integer types
            if v_cur < v_min or (v_cur > v and adjust_delta < 0.0 and not is_floating_point) then
                v_cur = (TYPE)(v_min)
            end
            if v_cur > v_max or (v_cur < v and adjust_delta > 0.0 and not is_floating_point) then
                v_cur = (TYPE)(v_max)
            end
        end
    end

    -- Apply result
    if v == v_cur then
        return v, false
    end
    v = v_cur
    return v, true
end

--- @param id        ImGuiID
--- @param data_type ImGuiDataType
--- @param v         number
--- @param v_speed   float
--- @param min       number
--- @param max       number
--- @param format    string
--- @param flags     ImGuiSliderFlags
function ImGui.DragBehavior(id, data_type, v, v_speed, min, max, format, flags)
    IM_ASSERT((flags == 1 or bit32.band(flags, ImGuiSliderFlags.InvalidMask_) == 0), "Invalid ImGuiSliderFlags flags! Has the legacy 'float power' argument been mistakenly cast to flags? Call function with ImGuiSliderFlags_Logarithmic flags instead.")

    local g = GImGui
    if g.ActiveId == id then
        if g.ActiveIdSource == ImGuiInputSource.Mouse and not g.IO.MouseDown[0] then
            ImGui.ClearActiveID()
        elseif (g.ActiveIdSource == ImGuiInputSource.Keyboard or g.ActiveIdSource == ImGuiInputSource.Gamepad) and g.NavActivatePressedId == id and not g.ActiveIdIsJustActivated then
            ImGui.ClearActiveID()
        end
    end
    if g.ActiveId ~= id then
        return v, false
    end
    if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.ReadOnly) ~= 0 or bit32.band(flags, ImGuiSliderFlags.ReadOnly) ~= 0 then
        return v, false
    end

    if data_type == ImGuiDataType.S8 then
        return ImGui.DragBehaviorT(ImS32, ImS32, ImGuiDataType.S32, v, v_speed, min and min or IM_S8_MIN, max and max or IM_S8_MAX, format, flags)
    elseif data_type == ImGuiDataType.U8 then
        return ImGui.DragBehaviorT(ImU32, ImS32, ImGuiDataType.U32, v, v_speed, min and min or IM_U8_MIN, max and max or IM_U8_MAX, format, flags)
    elseif data_type == ImGuiDataType.S16 then
        return ImGui.DragBehaviorT(ImS32, ImS32, ImGuiDataType.S32, v, v_speed, min and min or IM_S16_MIN, max and max or IM_S16_MAX, format, flags)
    elseif data_type == ImGuiDataType.U16 then
        return ImGui.DragBehaviorT(ImU32, ImS32, ImGuiDataType.U32, v, v_speed, min and min or IM_U16_MIN, max and max or IM_U16_MAX, format, flags)
    elseif data_type == ImGuiDataType.S32 then
        return ImGui.DragBehaviorT(ImS32, ImS32, data_type, v, v_speed, min and min or IM_S32_MIN, max and max or IM_S32_MAX, format, flags)
    elseif data_type == ImGuiDataType.U32 then
        return ImGui.DragBehaviorT(ImU32, ImS32, data_type, v, v_speed, min and min or IM_U32_MIN, max and max or IM_U32_MAX, format, flags)
    elseif data_type == ImGuiDataType.Float then
        return ImGui.DragBehaviorT(float, float, data_type, v, v_speed, min and min or -FLT_MAX, max and max or FLT_MAX, format, flags)
    elseif data_type == ImGuiDataType.Double then
        return ImGui.DragBehaviorT(double, double, data_type, v, v_speed, min and min or -DBL_MAX, max and max or DBL_MAX, format, flags)
    end

    IM_ASSERT(false)
    return v, false
end

--- @param flags     ImGuiSliderFlags
--- @param data_type ImGuiDataType
--- @param min       number
--- @param max       number
local function TempInputIsClampEnabled(flags, data_type, min, max)
    if bit32.band(flags, ImGuiSliderFlags.ClampOnInput) ~= 0 and (min ~= nil or max ~= nil) then
        local clamp_range_dir = 0
        if min ~= nil and max ~= nil then
            clamp_range_dir = ImGui.DataTypeCompare(data_type, min, max)
        end
        if min == nil or max == nil or clamp_range_dir < 0 then
            return true
        end
        if clamp_range_dir == 0 then
            return ImGui.DataTypeIsZero(data_type, min) and (bit32.band(flags, ImGuiSliderFlags.ClampZeroRange) ~= 0) or true
        end
    end
    return false
end

--- @param label     string
--- @param data_type ImGuiDataType
--- @param data      number
--- @param v_speed   float
--- @param min       number
--- @param max       number
--- @param format    string
--- @param flags     ImGuiSliderFlags
function ImGui.DragScalar(label, data_type, data, v_speed, min, max, format, flags)
    if v_speed == nil then v_speed = 1.0 end
    if flags == nil then flags = 0 end
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return data, false
    end

    local g = GImGui
    local style = g.Style
    local id = window:GetID(label)
    local w = ImGui.CalcItemWidth()
    local color_marker = (bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasColorMarker) ~= 0) and g.NextItemData.ColorMarker or 0

    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)
    local frame_bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y * 2.0))
    local total_bb = ImRect(frame_bb.Min, frame_bb.Max + ImVec2((label_size.x > 0.0) and (style.ItemInnerSpacing.x + label_size.x) or 0.0, 0.0))

    local temp_input_allowed = (bit32.band(flags, ImGuiSliderFlags.NoInput) == 0)
    ImGui.ItemSize(total_bb, style.FramePadding.y)
    if not ImGui.ItemAdd(total_bb, id, frame_bb, temp_input_allowed and ImGuiItemFlags.Inputable or 0) then
        return data, false
    end

    -- Default format string when passing NULL
    if format == nil then
        format = ImGui.DataTypeGetInfo(data_type).PrintFmt
    end

    local hovered = ImGui.ItemHoverable(frame_bb, id, g.LastItemData.ItemFlags)
    local temp_input_is_active = temp_input_allowed and ImGui.TempInputIsActive(id)
    if not temp_input_is_active then
        local clicked = hovered and ImGui.IsMouseClickedEx(0, ImGuiInputFlags.None, id)
        local double_clicked = (hovered and g.IO.MouseClickedCount[0] == 2 and ImGui.TestKeyOwner(ImGuiKey.MouseLeft, id))
        local make_active = (clicked or double_clicked or g.NavActivateId == id)
        if make_active and (clicked or double_clicked) then
            ImGui.SetKeyOwner(ImGuiKey.MouseLeft, id)
        end
        if make_active and temp_input_allowed then
            if (clicked and g.IO.KeyCtrl) or double_clicked or (g.NavActivateId == id and bit32.band(g.NavActivateFlags, ImGuiActivateFlags.PreferInput) ~= 0) then
                temp_input_is_active = true
            end
        end

        -- (Optional) simple click (without moving) turns Drag into an InputText
        if g.IO.ConfigDragClickToInputText and temp_input_allowed and not temp_input_is_active then
            if g.ActiveId == id and hovered and g.IO.MouseReleased[0] and not ImGui.IsMouseDragPastThreshold(0, g.IO.MouseDragThreshold * DRAG_MOUSE_THRESHOLD_FACTOR) then
                g.NavActivateId = id
                g.NavActivateFlags = ImGuiActivateFlags.PreferInput
                temp_input_is_active = true
            end
        end

        -- Store initial value (not used by main lib but available as a convenience but some mods e.g. to revert)
        if make_active then
            g.ActiveIdValueOnActivation = data
        end

        if make_active and not temp_input_is_active then
            ImGui.SetActiveID(id, window)
            ImGui.SetFocusID(id, window)
            ImGui.FocusWindow(window)
            g.ActiveIdUsingNavDirMask = bit32.bor(bit32.lshift(1, ImGuiDir.Left), bit32.lshift(1, ImGuiDir.Right))
        end
    end

    if temp_input_is_active then
        local clamp_enabled = TempInputIsClampEnabled(flags, data_type, min, max)
        return ImGui.TempInputScalar(frame_bb, id, label, data_type, data, format, clamp_enabled and min or nil, clamp_enabled and max or nil)
    end

    -- Draw frame
    local frame_col = ImGui.GetColorU32(g.ActiveId == id and ImGuiCol.FrameBgActive or hovered and ImGuiCol.FrameBgHovered or ImGuiCol.FrameBg)
    ImGui.RenderNavCursor(frame_bb, id)
    ImGui.RenderFrame(frame_bb.Min, frame_bb.Max, frame_col, false, style.FrameRounding)

    if color_marker ~= 0 and style.ColorMarkerSize > 0.0 then
        ImGui.RenderColorComponentMarker(frame_bb, ImGui.GetColorU32(color_marker, nil, true), style.FrameRounding)
    end

    ImGui.RenderFrameBorder(frame_bb.Min, frame_bb.Max, g.Style.FrameRounding)

    -- Drag behavior
    local value_changed
    data, value_changed = ImGui.DragBehavior(id, data_type, data, v_speed, min, max, format, flags)
    if value_changed then
        ImGui.MarkItemEdited(id)
    end

    -- TODO: ImGui.DataTypeFormatString() should be used here instead of ImFormatString()

    -- Display value using user-provided display format so user can add prefix/suffix/decorations to the value
    ImGui.RenderTextClipped(frame_bb.Min, frame_bb.Max, ImFormatString(format, data), nil, nil, ImVec2(0.5, 0.5))

    if label_size.x > 0.0 then
        ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
    end

    return data, value_changed
end

--- @param label    string
--- @param v        float
--- @param v_speed? float
--- @param v_min?   float
--- @param v_max?   float
--- @param format?  string
--- @param flags?   ImGuiSliderFlags
function ImGui.DragFloat(label, v, v_speed, v_min, v_max, format, flags)
    if v_speed == nil then v_speed = 1.0    end
    if v_min   == nil then v_min   = 0.0    end
    if v_max   == nil then v_max   = 0.0    end
    if format  == nil then format  = "%.3f" end
    if flags   == nil then flags   = 0      end

    return ImGui.DragScalar(label, ImGuiDataType.Float, v, v_speed, v_min, v_max, format, flags)
end

--- @param label    string
--- @param v        int
--- @param v_speed? float
--- @param v_min?   int
--- @param v_max?   int
--- @param format?  string
--- @param flags?   ImGuiSliderFlags
function ImGui.DragInt(label, v, v_speed, v_min, v_max, format, flags)
    if v_speed == nil then v_speed = 1.0  end
    if v_min   == nil then v_min   = 0    end
    if v_max   == nil then v_max   = 0    end
    if format  == nil then format  = "%d" end
    if flags   == nil then flags   = 0    end

    return ImGui.DragScalar(label, ImGuiDataType.S32, v, v_speed, v_min, v_max, format, flags)
end

-- `v` is mutated in place (1-based), returns value_changed
function ImGui.DragScalarN(label, data_type, v, components, v_speed, v_min, v_max, format, flags)
    if v_speed == nil then v_speed = 1.0 end
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local value_changed = false
    ImGui.BeginGroup()
    ImGui.PushID(label)
    ImGui.PushMultiItemsWidths(components, ImGui.CalcItemWidth())
    for i = 1, components do
        ImGui.PushID(i - 1)
        if i > 1 then
            ImGui.SameLine(0, g.Style.ItemInnerSpacing.x)
        end
        if bit32.band(flags, ImGuiSliderFlags.ColorMarkers) ~= 0 then
            ImGui.SetNextItemColorMarker(GDefaultRgbaColorMarkers[i])
        end
        local changed
        v[i], changed = ImGui.DragScalar("", data_type, v[i], v_speed, v_min, v_max, format, flags)
        value_changed = value_changed or changed
        ImGui.PopID()
        ImGui.PopItemWidth()
    end
    ImGui.PopID()

    local label_end = ImGui.FindRenderedTextEnd(label)
    if label_end > 1 then
        ImGui.SameLine(0, g.Style.ItemInnerSpacing.x)
        ImGui.TextEx(label, label_end)
    end

    ImGui.EndGroup()
    return value_changed
end

local function DragFloatN(n)
    return function(label, v, v_speed, v_min, v_max, format, flags)
        return ImGui.DragScalarN(label, ImGuiDataType.Float, v, n, v_speed or 1.0, v_min or 0.0, v_max or 0.0, format or "%.3f", flags or 0)
    end
end
local function DragIntN(n)
    return function(label, v, v_speed, v_min, v_max, format, flags)
        return ImGui.DragScalarN(label, ImGuiDataType.S32, v, n, v_speed or 1.0, v_min or 0, v_max or 0, format or "%d", flags or 0)
    end
end
ImGui.DragFloat2 = DragFloatN(2)
ImGui.DragFloat3 = DragFloatN(3)
ImGui.DragFloat4 = DragFloatN(4)
ImGui.DragInt2 = DragIntN(2)
ImGui.DragInt3 = DragIntN(3)
ImGui.DragInt4 = DragIntN(4)

-- NB: You likely want to specify the ImGuiSliderFlags_AlwaysClamp when using this.
--- @return float v_current_min
--- @return float v_current_max
--- @return bool  value_changed
local function DragRange2(data_type, label, v_current_min, v_current_max, v_speed, v_min, v_max, format, format_max, flags)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return v_current_min, v_current_max, false
    end

    local g = GImGui
    local lo = (data_type == ImGuiDataType.Float) and -FLT_MAX or INT_MIN
    local hi = (data_type == ImGuiDataType.Float) and FLT_MAX or INT_MAX
    ImGui.PushID(label)
    ImGui.BeginGroup()
    ImGui.PushMultiItemsWidths(2, ImGui.CalcItemWidth())

    local min_min = (v_min >= v_max) and lo or v_min
    local min_max = (v_min >= v_max) and v_current_max or ImMin(v_max, v_current_max)
    local min_flags = bit32.bor(flags, (min_min == min_max) and ImGuiSliderFlags.ReadOnly or 0)
    local value_changed, changed
    v_current_min, value_changed = ImGui.DragScalar("##min", data_type, v_current_min, v_speed, min_min, min_max, format, min_flags)
    ImGui.PopItemWidth()
    ImGui.SameLine(0, g.Style.ItemInnerSpacing.x)

    local max_min = (v_min >= v_max) and v_current_min or ImMax(v_min, v_current_min)
    local max_max = (v_min >= v_max) and hi or v_max
    local max_flags = bit32.bor(flags, (max_min == max_max) and ImGuiSliderFlags.ReadOnly or 0)
    v_current_max, changed = ImGui.DragScalar("##max", data_type, v_current_max, v_speed, max_min, max_max, format_max or format, max_flags)
    value_changed = value_changed or changed
    ImGui.PopItemWidth()
    ImGui.SameLine(0, g.Style.ItemInnerSpacing.x)

    ImGui.TextEx(label, ImGui.FindRenderedTextEnd(label))
    ImGui.EndGroup()
    ImGui.PopID()

    return v_current_min, v_current_max, value_changed
end

function ImGui.DragFloatRange2(label, v_current_min, v_current_max, v_speed, v_min, v_max, format, format_max, flags)
    return DragRange2(ImGuiDataType.Float, label, v_current_min, v_current_max, v_speed or 1.0, v_min or 0.0, v_max or 0.0, format or "%.3f", format_max, flags or 0)
end

function ImGui.DragIntRange2(label, v_current_min, v_current_max, v_speed, v_min, v_max, format, format_max, flags)
    return DragRange2(ImGuiDataType.S32, label, v_current_min, v_current_max, v_speed or 1.0, v_min or 0, v_max or 0, format or "%d", format_max, flags or 0)
end

----------------------------------------------------------------
-- [SECTION] SLIDERXXX
----------------------------------------------------------------

-- Convert a value v in the output space of a slider into a parametric position on the slider itself (the logical opposite of ScaleValueFromRatioT)
--- @param data_type                ImGuiDataType
--- @param v                        number
--- @param v_min                    number
--- @param v_max                    number
--- @param logarithmic_zero_epsilon float
--- @param zero_deadzone_halfsize   float
function ImGui.ScaleRatioFromValueT(data_type, v, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)
    if v_min == v_max then
        return 0.0
    end
    -- IM_UNUSED(data_type)

    local v_clamped
    if v_min < v_max then
        v_clamped = ImClamp(v, v_min, v_max)
    else
        v_clamped = ImClamp(v, v_max, v_min)
    end
    if logarithmic_zero_epsilon > 0.0 then -- == is_logarithmic from caller
        local flipped = v_max < v_min
        if flipped then -- Handle the case where the range is backwards
            v_min, v_max = v_max, v_min
        end

        -- Fudge min/max to avoid getting close to log(0)
        local v_min_fudged
        if ImAbs(v_min) < logarithmic_zero_epsilon then
            v_min_fudged = (v_min < 0.0) and -logarithmic_zero_epsilon or logarithmic_zero_epsilon
        else
            v_min_fudged = v_min
        end
        local v_max_fudged
        if ImAbs(v_max) < logarithmic_zero_epsilon then
            v_max_fudged = (v_max < 0.0) and -logarithmic_zero_epsilon or logarithmic_zero_epsilon
        else
            v_max_fudged = v_max
        end

        -- Awkward special cases - we need ranges of the form (-100 .. 0) to convert to (-100 .. -epsilon), not (-100 .. epsilon)
        if v_min == 0.0 and v_max < 0.0 then
            v_min_fudged = -logarithmic_zero_epsilon
        elseif v_max == 0.0 and v_min < 0.0 then
            v_max_fudged = -logarithmic_zero_epsilon
        end

        local result
        if v_clamped <= v_min_fudged then
            result = 0.0 -- Workaround for values that are in-range but below our fudge
        elseif v_clamped >= v_max_fudged then
            result = 1.0 -- Workaround for values that are in-range but above our fudge
        elseif v_min * v_max < 0.0 then -- Range crosses zero, so split into two portions
            local zero_point_center = (-v_min) / (v_max - v_min) -- The zero point in parametric space.  There's an argument we should take the logarithmic nature into account when calculating this, but for now this should do (and the most common case of a symmetrical range works fine)
            local zero_point_snap_L = zero_point_center - zero_deadzone_halfsize
            local zero_point_snap_R = zero_point_center + zero_deadzone_halfsize
            if v == 0.0 then
                result = zero_point_center -- Special case for exactly zero
            elseif v < 0.0 then
                result = (1.0 - (ImLog(-v_clamped / logarithmic_zero_epsilon) / ImLog(-v_min_fudged / logarithmic_zero_epsilon))) * zero_point_snap_L
            else
                result = zero_point_snap_R + ((ImLog(v_clamped / logarithmic_zero_epsilon) / ImLog(v_max_fudged / logarithmic_zero_epsilon)) * (1.0 - zero_point_snap_R))
            end
        elseif v_min < 0.0 or v_max < 0.0 then -- Entirely negative slider
            result = 1.0 - (ImLog(-v_clamped / -v_max_fudged) / ImLog(-v_min_fudged / -v_max_fudged))
        else
            result = ImLog(v_clamped / v_min_fudged) / ImLog(v_max_fudged / v_min_fudged)
        end

        return flipped and (1.0 - result) or result
    else
        -- Linear slider
        return (v_clamped - v_min) / (v_max - v_min)
    end
end

-- Convert a parametric position on a slider into a value v in the output space (the logical opposite of ScaleRatioFromValueT)
--- @param TYPE                     fun(val: number): number
--- @param SIGNEDTYPE               fun(val: number): number
--- @param data_type                ImGuiDataType
--- @param t                        float
--- @param v_min                    number
--- @param v_max                    number
--- @param logarithmic_zero_epsilon float
--- @param zero_deadzone_halfsize   float
function ImGui.ScaleValueFromRatioT(TYPE, SIGNEDTYPE, data_type, t, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)
    -- We special-case the extents because otherwise our logarithmic fudging can lead to "mathematically correct"
    -- but non-intuitive behaviors like a fully-left slider not actually reaching the minimum value. Also generally simpler.
    if t <= 0.0 or v_min == v_max then
        return v_min
    end
    if t >= 1.0 then
        return v_max
    end

    local result = 0
    if logarithmic_zero_epsilon > 0.0 then -- == is_logarithmic from caller
        -- Fudge min/max to avoid getting silly results close to zero
        local v_min_fudged
        if ImAbs(v_min) < logarithmic_zero_epsilon then
            v_min_fudged = (v_min < 0.0) and -logarithmic_zero_epsilon or logarithmic_zero_epsilon
        else
            v_min_fudged = v_min
        end
        local v_max_fudged
        if ImAbs(v_max) < logarithmic_zero_epsilon then
            v_max_fudged = (v_max < 0.0) and -logarithmic_zero_epsilon or logarithmic_zero_epsilon
        else
            v_max_fudged = v_max
        end

        local flipped = v_max < v_min -- Check if range is "backwards"
        if flipped then
            v_min_fudged, v_max_fudged = v_max_fudged, v_min_fudged
        end

        -- Awkward special case - we need ranges of the form (-100 .. 0) to convert to (-100 .. -epsilon), not (-100 .. epsilon)
        if v_max == 0.0 and v_min < 0.0 then
            v_max_fudged = -logarithmic_zero_epsilon
        end

        local t_with_flip = flipped and (1.0 - t) or t -- t, but flipped if necessary to account for us flipping the range

        if v_min * v_max < 0.0 then -- Range crosses zero, so we have to do this in two parts
            local zero_point_center = (-ImMin(v_min, v_max)) / ImAbs(v_max - v_min) -- The zero point in parametric space
            local zero_point_snap_L = zero_point_center - zero_deadzone_halfsize
            local zero_point_snap_R = zero_point_center + zero_deadzone_halfsize

            if t_with_flip >= zero_point_snap_L and t_with_flip <= zero_point_snap_R then
                result = (TYPE)(0.0) -- Special case to make getting exactly zero possible (the epsilon prevents it otherwise)
            elseif t_with_flip < zero_point_center then
                result = (TYPE)(-(logarithmic_zero_epsilon * ImPow(-v_min_fudged / logarithmic_zero_epsilon, 1.0 - (t_with_flip / zero_point_snap_L))))
            else
                result = (TYPE)(logarithmic_zero_epsilon * ImPow(v_max_fudged / logarithmic_zero_epsilon, (t_with_flip - zero_point_snap_R) / (1.0 - zero_point_snap_R)))
            end
        elseif v_min < 0.0 or v_max < 0.0 then  -- Entirely negative slider
            result = (TYPE)(-(-v_max_fudged * ImPow(-v_min_fudged / -v_max_fudged, 1.0 - t_with_flip)))
        else
            result = (TYPE)(v_min_fudged * ImPow(v_max_fudged / v_min_fudged, t_with_flip))
        end
    else
        -- Linear slider
        local is_floating_point = (data_type == ImGuiDataType.Float) or (data_type == ImGuiDataType.Double)
        if is_floating_point then
            result = ImLerp(v_min, v_max, t)
        elseif t < 1.0 then
            local v_new_off_f = (SIGNEDTYPE)((v_max - v_min)) * t
            result = (TYPE)((SIGNEDTYPE)(v_min) + (SIGNEDTYPE)(v_new_off_f + 0)) -- LUA: + 0 instead of + ((v_min > v_max) and -0.5 or 0.5)
        end
    end

    return result
end

--- @generic T : number
--- @param TYPE        fun(val: number): T
--- @param SIGNEDTYPE  fun(val: number): T
--- @param bb          ImRect
--- @param id          ImGuiID
--- @param data_type   ImGuiDataType
--- @param v           T
--- @param v_min       T
--- @param v_max       T
--- @param format      string
--- @param flags       ImGuiSliderFlags
--- @param out_grab_bb ImRect
--- @return T    v             # updated `v` passed in
--- @return bool value_changed
function ImGui.SliderBehaviorT(TYPE, SIGNEDTYPE, bb, id, data_type, v, v_min, v_max, format, flags, out_grab_bb)
    local g = GImGui
    local style = g.Style

    local axis = (bit32.band(flags, ImGuiSliderFlags.Vertical) ~= 0) and ImGuiAxis.Y or ImGuiAxis.X
    local is_logarithmic = bit32.band(flags, ImGuiSliderFlags.Logarithmic) ~= 0
    local is_floating_point = (data_type == ImGuiDataType.Float) or (data_type == ImGuiDataType.Double)
    local v_range_f = (v_min < v_max) and (v_max - v_min) or (v_min - v_max)

    local grab_padding = 2.0
    local slider_sz = (bb.Max[axis] - bb.Min[axis]) - grab_padding * 2.0
    local grab_sz = style.GrabMinSize
    if not is_floating_point and v_range_f >= 0.0 then
        grab_sz = ImMax(slider_sz / (v_range_f + 1), style.GrabMinSize)
    end
    grab_sz = ImMin(grab_sz, slider_sz)
    local slider_usable_sz = slider_sz - grab_sz
    local slider_usable_pos_min = bb.Min[axis] + grab_padding + grab_sz * 0.5
    local slider_usable_pos_max = bb.Max[axis] - grab_padding - grab_sz * 0.5

    local logarithmic_zero_epsilon = 0.0
    local zero_deadzone_halfsize = 0.0
    if is_logarithmic then
        local decimal_precision = is_floating_point and ImParseFormatPrecision(format, 3) or 1
        logarithmic_zero_epsilon = ImPow(0.1, decimal_precision)
        zero_deadzone_halfsize = (style.LogSliderDeadzone * 0.5) / ImMax(slider_usable_sz, 1.0)
    end

    local value_changed = false
    if g.ActiveId == id then
        local set_new_value = false
        local clicked_t = 0.0
        if g.ActiveIdSource == ImGuiInputSource.Mouse then
            if not g.IO.MouseDown[0] then
                ImGui.ClearActiveID()
            else
                local mouse_abs_pos = g.IO.MousePos[axis]
                if g.ActiveIdIsJustActivated then
                    local grab_t = ImGui.ScaleRatioFromValueT(data_type, v, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)
                    if axis == ImGuiAxis.Y then
                        grab_t = 1.0 - grab_t
                    end
                    local grab_pos = ImLerp(slider_usable_pos_min, slider_usable_pos_max, grab_t)
                    local clicked_around_grab = (mouse_abs_pos >= grab_pos - grab_sz * 0.5 - 1.0) and (mouse_abs_pos <= grab_pos + grab_sz * 0.5 + 1.0)
                    g.SliderGrabClickOffset = (clicked_around_grab and is_floating_point) and (mouse_abs_pos - grab_pos) or 0.0
                end
                if slider_usable_sz > 0.0 then
                    clicked_t = ImSaturate((mouse_abs_pos - g.SliderGrabClickOffset - slider_usable_pos_min) / slider_usable_sz)
                end
                if axis == ImGuiAxis.Y then
                    clicked_t = 1.0 - clicked_t
                end
                set_new_value = true
            end
        elseif g.ActiveIdSource == ImGuiInputSource.Keyboard or g.ActiveIdSource == ImGuiInputSource.Gamepad then
            if g.ActiveIdIsJustActivated then
                g.SliderCurrentAccum = 0.0
                g.SliderCurrentAccumDirty = false
            end

            local input_delta = (axis == ImGuiAxis.X) and ImGui.GetNavTweakPressedAmount(axis) or -ImGui.GetNavTweakPressedAmount(axis)
            if input_delta ~= 0.0 then
                local tweak_slow = ImGui.IsKeyDown((g.NavInputSource == ImGuiInputSource.Gamepad) and ImGuiKey.NavGamepadTweakSlow or ImGuiKey.NavKeyboardTweakSlow)
                local tweak_fast = ImGui.IsKeyDown((g.NavInputSource == ImGuiInputSource.Gamepad) and ImGuiKey.NavGamepadTweakFast or ImGuiKey.NavKeyboardTweakFast)
                local decimal_precision = is_floating_point and ImParseFormatPrecision(format, 3) or 0
                if decimal_precision > 0 then
                    input_delta = input_delta / 100.0
                    if tweak_slow then
                        input_delta = input_delta / 10.0
                    end
                else
                    if (v_range_f >= -100.0 and v_range_f <= 100.0 and v_range_f ~= 0.0) or tweak_slow then
                        input_delta = ((input_delta < 0.0) and -1.0 or 1.0) / v_range_f
                    else
                        input_delta = input_delta / 100.0
                    end
                end
                if tweak_fast then
                    input_delta = input_delta * 10.0
                end

                g.SliderCurrentAccum = g.SliderCurrentAccum + input_delta
                g.SliderCurrentAccumDirty = true
            end

            local delta = g.SliderCurrentAccum
            if g.NavActivatePressedId == id and not g.ActiveIdIsJustActivated then
                ImGui.ClearActiveID()
            elseif g.SliderCurrentAccumDirty then
                clicked_t = ImGui.ScaleRatioFromValueT(data_type, v, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)

                if (clicked_t >= 1.0 and delta > 0.0) or (clicked_t <= 0.0 and delta < 0.0) then
                    set_new_value = false
                    g.SliderCurrentAccum = 0.0
                else
                    set_new_value = true
                    local old_clicked_t = clicked_t
                    clicked_t = ImSaturate(clicked_t + delta)

                    local v_new = ImGui.ScaleValueFromRatioT(TYPE, SIGNEDTYPE, data_type, clicked_t, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)
                    if is_floating_point and bit32.band(flags, ImGuiSliderFlags.NoRoundToFormat) == 0 then
                        v_new = ImGui.RoundScalarWithFormatT(format, data_type, v_new)
                    end
                    local new_clicked_t = ImGui.ScaleRatioFromValueT(data_type, v_new, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)

                    if delta > 0 then
                        g.SliderCurrentAccum = g.SliderCurrentAccum - ImMin(new_clicked_t - old_clicked_t, delta)
                    else
                        g.SliderCurrentAccum = g.SliderCurrentAccum - ImMax(new_clicked_t - old_clicked_t, delta)
                    end
                end

                g.SliderCurrentAccumDirty = false
            end
        end

        if set_new_value then
            if (bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.ReadOnly) ~= 0) or (bit32.band(flags, ImGuiSliderFlags.ReadOnly) ~= 0) then
                set_new_value = false
            end
        end

        if set_new_value then
            local v_new = ImGui.ScaleValueFromRatioT(TYPE, SIGNEDTYPE, data_type, clicked_t, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)

            if is_floating_point and bit32.band(flags, ImGuiSliderFlags.NoRoundToFormat) == 0 then
                v_new = ImGui.RoundScalarWithFormatT(format, data_type, v_new)
            end

            if v ~= v_new then
                v = v_new
                value_changed = true
            end
        end
    end

    if slider_sz < 1.0 then
        ImRect_Copy(out_grab_bb, ImRect(bb.Min, bb.Min))
    else
        local grab_t = ImGui.ScaleRatioFromValueT(data_type, v, v_min, v_max, logarithmic_zero_epsilon, zero_deadzone_halfsize)
        if axis == ImGuiAxis.Y then
            grab_t = 1.0 - grab_t
        end
        local grab_pos = ImLerp(slider_usable_pos_min, slider_usable_pos_max, grab_t)
        if axis == ImGuiAxis.X then
            ImRect_Copy(out_grab_bb, ImRect(grab_pos - grab_sz * 0.5, bb.Min.y + grab_padding, grab_pos + grab_sz * 0.5, bb.Max.y - grab_padding))
        else
            ImRect_Copy(out_grab_bb, ImRect(bb.Min.x + grab_padding, grab_pos - grab_sz * 0.5, bb.Max.x - grab_padding, grab_pos + grab_sz * 0.5))
        end
    end

    return v, value_changed
end

--- @generic T : number
--- @param bb          ImRect
--- @param id          ImGuiID
--- @param data_type   ImGuiDataType
--- @param v           T
--- @param min         T
--- @param max         T
--- @param format      string
--- @param flags       ImGuiSliderFlags
--- @param out_grab_bb ImRect
--- @return T    v
--- @return bool value_changed
function ImGui.SliderBehavior(bb, id, data_type, v, min, max, format, flags, out_grab_bb)
    IM_ASSERT((flags == 1 or bit32.band(flags, ImGuiSliderFlags.InvalidMask_) == 0), "Invalid ImGuiSliderFlags flags! Has the legacy 'float power' argument been mistakenly cast to flags? Call function with ImGuiSliderFlags_Logarithmic flags instead.")
    IM_ASSERT(bit32.band(flags, ImGuiSliderFlags.WrapAround) == 0)

    if     data_type == ImGuiDataType.S8 then
        local v32 = (ImS32)((ImS8)(v)); local r
        v32, r = ImGui.SliderBehaviorT(ImS32, ImS32, bb, id, ImGuiDataType.S32, v32, min, max, format, flags, out_grab_bb)
        if r then v = (ImS8)(v32) end
        return v, r
    elseif data_type == ImGuiDataType.U8 then
        local v32 = (ImU32)((ImU8)(v)); local r
        v32, r = ImGui.SliderBehaviorT(ImU32, ImS32, bb, id, ImGuiDataType.U32, v32, min, max, format, flags, out_grab_bb)
        if r then v = (ImU8)(v32) end
        return v, r
    elseif data_type == ImGuiDataType.S16 then
        local v32 = (ImS32)((ImS16)(v)); local r
        v32, r = ImGui.SliderBehaviorT(ImS32, ImS32, bb, id, ImGuiDataType.S32, v32, min, max, format, flags, out_grab_bb)
        if r then v = (ImS16)(v32) end
        return v, r
    elseif data_type == ImGuiDataType.U16 then
        local v32 = (ImU32)((ImU16)(v)); local r
        v32, r = ImGui.SliderBehaviorT(ImU32, ImS32, bb, id, ImGuiDataType.U32, v32, min, max, format, flags, out_grab_bb)
        if r then v = (ImU16)(v32) end
        return v, r
    elseif data_type == ImGuiDataType.S32 then
        IM_ASSERT(min >= math.floor(IM_S32_MIN / 2) and max <= math.floor(IM_S32_MAX / 2))
        return ImGui.SliderBehaviorT(ImS32, ImS32, bb, id, data_type, v, min, max, format, flags, out_grab_bb)
    elseif data_type == ImGuiDataType.U32 then
        IM_ASSERT(max <= math.floor(IM_U32_MAX / 2))
        return ImGui.SliderBehaviorT(ImU32, ImS32, bb, id, data_type, v, min, max, format, flags, out_grab_bb)
    elseif data_type == ImGuiDataType.Float then
        IM_ASSERT(min >= -FLT_MAX / 2.0 and max <= FLT_MAX / 2.0)
        return ImGui.SliderBehaviorT(float, float, bb, id, data_type, v, min, max, format, flags, out_grab_bb)
    elseif data_type == ImGuiDataType.Double then
        IM_ASSERT(min >= -DBL_MAX / 2.0 and max <= DBL_MAX / 2.0)
        return ImGui.SliderBehaviorT(double, double, bb, id, data_type, v, min, max, format, flags, out_grab_bb)
    end

    IM_ASSERT(false)
    return v, false
end

--- @generic T : number
--- @param label     string
--- @param data_type ImGuiDataType
--- @param data      T
--- @param min       T
--- @param max       T
--- @param format?   string
--- @param flags?    ImGuiSliderFlags
function ImGui.SliderScalar(label, data_type, data, min, max, format, flags)
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return data, false
    end

    local g = GImGui
    local style = g.Style
    local id = window:GetID(label)
    local w = ImGui.CalcItemWidth()
    local color_marker = (bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasColorMarker) ~= 0) and g.NextItemData.ColorMarker or 0

    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)
    local frame_bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + ImVec2(w, label_size.y + style.FramePadding.y * 2.0))
    local total_bb_x = frame_bb.Max.x + ((label_size.x > 0.0) and (style.ItemInnerSpacing.x + label_size.x) or 0.0)
    local total_bb = ImRect(frame_bb.Min, ImVec2(total_bb_x, frame_bb.Max.y))

    local temp_input_allowed = bit32.band(flags, ImGuiSliderFlags.NoInput) == 0
    ImGui.ItemSize(total_bb, style.FramePadding.y)
    local item_flags = temp_input_allowed and ImGuiItemFlags.Inputable or 0
    if not ImGui.ItemAdd(total_bb, id, frame_bb, item_flags) then
        return data, false
    end

    if format == nil then
        format = ImGui.DataTypeGetInfo(data_type).PrintFmt
    end

    local hovered = ImGui.ItemHoverable(frame_bb, id, g.LastItemData.ItemFlags)
    local temp_input_is_active = temp_input_allowed and ImGui.TempInputIsActive(id)
    if not temp_input_is_active then
        local clicked = hovered and ImGui.IsMouseClickedEx(0, ImGuiInputFlags.None, id)
        local make_active = clicked or g.NavActivateId == id
        if make_active and clicked then
            ImGui.SetKeyOwner(ImGuiKey.MouseLeft, id)
        end
        if make_active and temp_input_allowed then
            if (clicked and g.IO.KeyCtrl) or (g.NavActivateId == id and bit32.band(g.NavActivateFlags, ImGuiActivateFlags.PreferInput) ~= 0) then
                temp_input_is_active = true
            end
        end

        if make_active then
            g.ActiveIdValueOnActivation = data
        end

        if make_active and not temp_input_is_active then
            ImGui.SetActiveID(id, window)
            ImGui.SetFocusID(id, window)
            ImGui.FocusWindow(window)
            g.ActiveIdUsingNavDirMask = bit32.bor(g.ActiveIdUsingNavDirMask, bit32.lshift(1, ImGuiDir.Left), bit32.lshift(1, ImGuiDir.Right))
        end
    end

    if temp_input_is_active then
        local clamp_enabled = bit32.band(flags, ImGuiSliderFlags.ClampOnInput) ~= 0
        return ImGui.TempInputScalar(frame_bb, id, label, data_type, data, format, clamp_enabled and min or nil, clamp_enabled and max or nil)
    end

    local frame_col = ImGui.GetColorU32((g.ActiveId == id) and ImGuiCol.FrameBgActive or (hovered and ImGuiCol.FrameBgHovered or ImGuiCol.FrameBg))
    ImGui.RenderNavCursor(frame_bb, id)
    ImGui.RenderFrame(frame_bb.Min, frame_bb.Max, frame_col, false, style.FrameRounding)
    if color_marker ~= 0 and style.ColorMarkerSize > 0.0 then
        ImGui.RenderColorComponentMarker(frame_bb, ImGui.GetColorU32(color_marker, nil, true), style.FrameRounding)
    end
    ImGui.RenderFrameBorder(frame_bb.Min, frame_bb.Max, g.Style.FrameRounding)

    local grab_bb = ImRect()
    local value_changed
    data, value_changed = ImGui.SliderBehavior(frame_bb, id, data_type, data, min, max, format, flags, grab_bb)
    if value_changed then
        ImGui.MarkItemEdited(id)
    end

    if grab_bb.Max.x > grab_bb.Min.x then
        window.DrawList:AddRectFilled(grab_bb.Min, grab_bb.Max, ImGui.GetColorU32((g.ActiveId == id) and ImGuiCol.SliderGrabActive or ImGuiCol.SliderGrab), style.GrabRounding)
    end

    -- TODO: ImGui.DataTypeFormatString() should be used here instead of ImFormatString()

    -- if g.LogEnabled then
    --     ImGui.LogSetNextTextDecoration("{", "}")
    -- end
    ImGui.RenderTextClipped(frame_bb.Min, frame_bb.Max, ImFormatString(format, data), nil, nil, ImVec2(0.5, 0.5))

    if label_size.x > 0.0 then
        ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
    end

    -- IMGUI_TEST_ENGINE_ITEM_INFO()
    return data, value_changed
end

--- @param label      string
--- @param data_type  ImGuiDataType
--- @param v          table
--- @param components int
--- @param v_min      number
--- @param v_max      number
--- @param format?    string
--- @param flags?     ImGuiSliderFlags
function ImGui.SliderScalarN(label, data_type, v, components, v_min, v_max, format, flags)
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local value_changed = false
    ImGui.BeginGroup()
    ImGui.PushID(label)
    ImGui.PushMultiItemsWidths(components, ImGui.CalcItemWidth())

    for i = 1, components do
        ImGui.PushID(i - 1)
        if i > 1 then
            ImGui.SameLine(0, g.Style.ItemInnerSpacing.x)
        end
        if bit32.band(flags, ImGuiSliderFlags.ColorMarkers) ~= 0 then
            ImGui.SetNextItemColorMarker(GDefaultRgbaColorMarkers[i])
        end
        local changed
        v[i], changed = ImGui.SliderScalar("", data_type, v[i], v_min, v_max, format, flags)
        value_changed = value_changed or changed
        ImGui.PopID()
        ImGui.PopItemWidth()
    end
    ImGui.PopID()

    local label_end = ImGui.FindRenderedTextEnd(label)
    if label_end > 1 then
        ImGui.SameLine(0, g.Style.ItemInnerSpacing.x)
        ImGui.TextEx(label, label_end)
    end

    ImGui.EndGroup()
    return value_changed
end

--- @param label   string
--- @param v       [float, float]
--- @param v_min   float
--- @param v_max   float
--- @param format? string
--- @param flags?  ImGuiSliderFlags
function ImGui.SliderFloat2(label, v, v_min, v_max, format, flags)
    return ImGui.SliderScalarN(label, ImGuiDataType.Float, v, 2, v_min, v_max, format, flags)
end

--- @param label   string
--- @param v       [float, float, float]
--- @param v_min   float
--- @param v_max   float
--- @param format? string
--- @param flags?  ImGuiSliderFlags
function ImGui.SliderFloat3(label, v, v_min, v_max, format, flags)
    return ImGui.SliderScalarN(label, ImGuiDataType.Float, v, 3, v_min, v_max, format, flags)
end

--- @param label   string
--- @param v       [float, float, float, float]
--- @param v_min   float
--- @param v_max   float
--- @param format? string
--- @param flags?  ImGuiSliderFlags
function ImGui.SliderFloat4(label, v, v_min, v_max, format, flags)
    return ImGui.SliderScalarN(label, ImGuiDataType.Float, v, 4, v_min, v_max, format, flags)
end

--- @param label   string
--- @param v       float
--- @param v_min   float
--- @param v_max   float
--- @param format? string
--- @param flags?  ImGuiSliderFlags
function ImGui.SliderFloat(label, v, v_min, v_max, format, flags)
    if format == nil then format = "%.3f" end
    if flags  == nil then flags  = 0      end

    return ImGui.SliderScalar(label, ImGuiDataType.Float, v, v_min, v_max, format, flags)
end

--- @param label          string
--- @param v_rad          float
--- @param v_degrees_min? float
--- @param v_degrees_max? float
--- @param format?        string
--- @param flags?         ImGuiSliderFlags
--- @return float v_rad         # updated `v_rad`
--- @return bool  value_changed
function ImGui.SliderAngle(label, v_rad, v_degrees_min, v_degrees_max, format, flags)
    if v_degrees_min == nil then v_degrees_min = -360.0     end
    if v_degrees_max == nil then v_degrees_max =  360.0     end
    if format        == nil then format        = "%.0f deg" end
    if flags         == nil then flags         = 0          end

    local v_deg = v_rad * 360.0 / (2 * IM_PI)
    local value_changed
    v_deg, value_changed = ImGui.SliderFloat(label, v_deg, v_degrees_min, v_degrees_max, format, flags)
    if value_changed then
        v_rad = v_deg * (2 * IM_PI) / 360.0
    end
    return v_rad, value_changed
end

--- @param label   string
--- @param v       int
--- @param v_min   int
--- @param v_max   int
--- @param format? string
--- @param flags?  ImGuiSliderFlags
function ImGui.SliderInt(label, v, v_min, v_max, format, flags)
    if format == nil then format = "%d" end
    if flags  == nil then flags  = 0    end

    return ImGui.SliderScalar(label, ImGuiDataType.S32, v, v_min, v_max, format, flags)
end

function ImGui.SliderInt2(label, v, v_min, v_max, format, flags)
    return ImGui.SliderScalarN(label, ImGuiDataType.S32, v, 2, v_min, v_max, format or "%d", flags)
end

function ImGui.SliderInt3(label, v, v_min, v_max, format, flags)
    return ImGui.SliderScalarN(label, ImGuiDataType.S32, v, 3, v_min, v_max, format or "%d", flags)
end

function ImGui.SliderInt4(label, v, v_min, v_max, format, flags)
    return ImGui.SliderScalarN(label, ImGuiDataType.S32, v, 4, v_min, v_max, format or "%d", flags)
end

--- @param label     string
--- @param size      ImVec2
--- @param data_type ImGuiDataType
--- @param data      number
--- @param min       number
--- @param max       number
--- @param format?   string
--- @param flags?    ImGuiSliderFlags
function ImGui.VSliderScalar(label, size, data_type, data, min, max, format, flags)
    if flags == nil then flags = 0 end
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return data, false
    end

    local g = GImGui
    local style = g.Style
    local id = window:GetID(label)

    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)
    local frame_bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + size)
    local bb = ImRect(frame_bb.Min, ImVec2(frame_bb.Max.x + (label_size.x > 0.0 and (style.ItemInnerSpacing.x + label_size.x) or 0.0), frame_bb.Max.y))

    ImGui.ItemSize(bb, style.FramePadding.y)
    if not ImGui.ItemAdd(frame_bb, id) then
        return data, false
    end

    if format == nil then
        format = ImGui.DataTypeGetInfo(data_type).PrintFmt
    end

    local hovered = ImGui.ItemHoverable(frame_bb, id, g.LastItemData.ItemFlags)
    local clicked = hovered and ImGui.IsMouseClickedEx(0, ImGuiInputFlags.None, id)
    if clicked or g.NavActivateId == id then
        if clicked then
            ImGui.SetKeyOwner(ImGuiKey.MouseLeft, id)
        end
        ImGui.SetActiveID(id, window)
        ImGui.SetFocusID(id, window)
        ImGui.FocusWindow(window)
        g.ActiveIdUsingNavDirMask = bit32.bor(g.ActiveIdUsingNavDirMask, bit32.lshift(1, ImGuiDir.Up), bit32.lshift(1, ImGuiDir.Down))
    end

    local frame_col = ImGui.GetColorU32((g.ActiveId == id) and ImGuiCol.FrameBgActive or (hovered and ImGuiCol.FrameBgHovered or ImGuiCol.FrameBg))
    ImGui.RenderNavCursor(frame_bb, id)
    ImGui.RenderFrame(frame_bb.Min, frame_bb.Max, frame_col, true, g.Style.FrameRounding)

    local grab_bb = ImRect()
    local value_changed
    data, value_changed = ImGui.SliderBehavior(frame_bb, id, data_type, data, min, max, format, bit32.bor(flags or 0, ImGuiSliderFlags.Vertical), grab_bb)
    if value_changed then
        ImGui.MarkItemEdited(id)
    end

    if grab_bb.Max.y > grab_bb.Min.y then
        window.DrawList:AddRectFilled(grab_bb.Min, grab_bb.Max, ImGui.GetColorU32((g.ActiveId == id) and ImGuiCol.SliderGrabActive or ImGuiCol.SliderGrab), style.GrabRounding)
    end

    -- local value_buf, value_buf_size = {}, 64
    -- TODO: ImGui.DataTypeFormatString()
    ImGui.RenderTextClipped(ImVec2(frame_bb.Min.x, frame_bb.Min.y + style.FramePadding.y), frame_bb.Max, ImFormatString(format, data), nil, nil, ImVec2(0.5, 0.0))
    if label_size.x > 0.0 then
        ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
    end

    -- IMGUI_TEST_ENGINE_ITEM_INFO()
    return data, value_changed
end

--- @param label   string
--- @param size    ImVec2
--- @param v       float
--- @param v_min   float
--- @param v_max   float
--- @param format? string
--- @param flags?  ImGuiSliderFlags
function ImGui.VSliderFloat(label, size, v, v_min, v_max, format, flags)
    if format == nil then format = "%.3f" end

    return ImGui.VSliderScalar(label, size, ImGuiDataType.Float, v, v_min, v_max, format, flags)
end

--- @param label   string
--- @param size    ImVec2
--- @param v       int
--- @param v_min   int
--- @param v_max   int
--- @param format? string
--- @param flags?  ImGuiSliderFlags
function ImGui.VSliderInt(label, size, v, v_min, v_max, format, flags)
    if format == nil then format = "%d" end

    return ImGui.VSliderScalar(label, size, ImGuiDataType.S32, v, v_min, v_max, format, flags)
end

----------------------------------------------------------------
-- [SECTION] INPUT TEXT
----------------------------------------------------------------

--- @param label     string
--- @param buf       char[]
--- @param buf_size  int
--- @param flags?    ImGuiInputTextFlags
--- @param callback? ImGuiInputTextCallback
--- @param user_data any
function ImGui.InputText(label, buf, buf_size, flags, callback, user_data)
    if flags == nil then flags = 0 end

    IM_ASSERT(bit32.band(flags, ImGuiInputTextFlags.Multiline) == 0)
    return ImGui.InputTextEx(label, nil, buf, buf_size, ImVec2(0, 0), flags, callback, user_data)
end

--- @param size? ImVec2
function ImGui.InputTextMultiline(label, buf, buf_size, size, flags, callback, user_data)
    return ImGui.InputTextEx(label, nil, buf, buf_size, size or ImVec2(0, 0), bit32.bor(flags or 0, ImGuiInputTextFlags.Multiline), callback, user_data)
end

ImStb = {}

--- @module "imstb_textedit"
local stbte

local IMSTB_TEXTEDIT_GETWIDTH_NEWLINE = -1.0

ImStb.TEXTEDIT_memmove = ImStd.memmove

--- @param ctx  ImGuiContext
--- @param text             char[]
--- @param text_begin       int
--- @param text_end_display int
--- @param text_end         int
--- @param out_offset?      ImVec2
--- @param flags?           ImDrawTextFlags
local function InputTextCalcTextSize(ctx, text, text_begin, text_end_display, text_end, out_offset, flags)
    if flags == nil then flags = 0 end

    local g = ctx
    local obj = g.InputTextState
    IM_ASSERT(text_end_display >= text_begin and text_end_display <= text_end)
    return ImFontCalcTextSizeEx(g.Font, g.FontSize, FLT_MAX, obj.WrapWidth, text, text_begin, text_end_display, text_end, out_offset, flags)
end

--- @param obj ImGuiInputTextState
--- @return int
function ImStb.TEXTEDIT_STRINGLEN(obj) return obj.TextLen end

--- @param obj ImGuiInputTextState
--- @param idx int                 # 1-based
function ImStb.TEXTEDIT_GETCHAR(obj, idx) IM_ASSERT(idx >= 1 and idx <= obj.TextLen + 1); return obj.TextSrc[idx] end

--- @param obj            ImGuiInputTextState
--- @param line_start_idx int                 # 1-based
--- @param char_idx       int                 # 1-based
--- @return float
function ImStb.TEXTEDIT_GETWIDTH(obj, line_start_idx, char_idx) local _, c = ImStd.ImTextCharFromUtf8(obj.TextSrc, line_start_idx + char_idx - 1, obj.TextLen + 1); if c == 10 then return IMSTB_TEXTEDIT_GETWIDTH_NEWLINE end; local g = obj.Ctx; return g.FontBaked:GetCharAdvance(c) * g.FontBakedScale end

--- @param r              StbTexteditRow
--- @param obj            ImGuiInputTextState
--- @param line_start_idx int                 # 1-based
function ImStb.TEXTEDIT_LAYOUTROW(r, obj, line_start_idx)
    local text = obj.TextSrc
    local size, text_remaining = InputTextCalcTextSize(obj.Ctx, text, line_start_idx, obj.TextLen + 1, obj.TextLen + 1, nil, bit32.bor(ImDrawTextFlags.StopOnNewLine, ImDrawTextFlags.WrapKeepBlanks))
    r.x0 = 0.0
    r.x1 = size.x
    r.baseline_y_delta = size.y
    r.ymin = 0.0
    r.ymax = size.y
    r.num_chars = text_remaining - line_start_idx
end

--- @param obj ImGuiInputTextState
--- @param idx int
function ImStb.TEXTEDIT_GETNEXTCHARINDEX(obj, idx)
    if idx >= obj.TextLen then
        return obj.TextLen + 1
    end
    return idx + ImStd.ImTextCharFromUtf8(obj.TextSrc, idx, obj.TextLen + 1)
end

--- @param obj ImGuiInputTextState
--- @param idx int
function ImStb.TEXTEDIT_GETPREVCHARINDEX(obj, idx)
    if idx <= 1 then
        return -1
    end
    local p = ImStd.ImTextFindPreviousUtf8Codepoint(obj.TextSrc, 1, idx)
    return p
end

local ImCharIsSeparatorW do

local separator_list = {
    44, 0x3001, 46, 0x3002, 59, 0xFF1B, 40, 0xFF08, 41, 0xFF09, 123, 0xFF5B, 125, 0xFF5D,
    91, 0x300C, 93, 0x300D, 124, 0xFF5C, 33, 0xFF01, 92, 0xFFE5, 47, 0x30FB, 0xFF0F,
    10, 13
}

--- @param c unsigned_int
function ImCharIsSeparatorW(c)
    for i = 1, #separator_list do
        if c == separator_list[i] then
            return true
        end
    end
    return false
end

end

--- @param obj ImGuiInputTextState
--- @param idx int
function ImStb.is_word_boundary_from_right(obj, idx)
    -- When ImGuiInputTextFlags.Password is set, we don't want actions such as Ctrl+Arrow to leak the fact that underlying data are blanks or separators
    if bit32.band(obj.Flags, ImGuiInputTextFlags.Password) ~= 0 or idx <= 1 then
        return false
    end

    local prev = ImStd.ImTextFindPreviousUtf8Codepoint(obj.TextSrc, 1, idx)
    local _, curr_c = ImStd.ImTextCharFromUtf8(obj.TextSrc, idx, obj.TextLen + 1)
    local _, prev_c = ImStd.ImTextCharFromUtf8(obj.TextSrc, prev, obj.TextLen + 1)

    local prev_white = ImCharIsBlankW(prev_c)
    local prev_separ = ImCharIsSeparatorW(prev_c)
    local curr_white = ImCharIsBlankW(curr_c)
    local curr_separ = ImCharIsSeparatorW(curr_c)
    return ((prev_white or prev_separ) and not (curr_separ or curr_white)) or (curr_separ and not prev_separ)
end

--- @param obj ImGuiInputTextState
--- @param idx int
function ImStb.is_word_boundary_from_left(obj, idx)
    if bit32.band(obj.Flags, ImGuiInputTextFlags.Password) ~= 0 or idx <= 1 then
        return false
    end

    local prev = ImStd.ImTextFindPreviousUtf8Codepoint(obj.TextSrc, 1, idx)
    local _, prev_c = ImStd.ImTextCharFromUtf8(obj.TextSrc, idx, obj.TextLen + 1)
    local _, curr_c = ImStd.ImTextCharFromUtf8(obj.TextSrc, prev, obj.TextLen + 1)

    local prev_white = ImCharIsBlankW(prev_c)
    local prev_separ = ImCharIsSeparatorW(prev_c)
    local curr_white = ImCharIsBlankW(curr_c)
    local curr_separ = ImCharIsSeparatorW(curr_c)
    return (prev_white and not (curr_separ or curr_white)) or (curr_separ and not prev_separ)
end

--- @param obj ImGuiInputTextState
--- @param idx int
function ImStb.TEXTEDIT_MOVEWORDLEFT(obj, idx)
    idx = ImStb.TEXTEDIT_GETPREVCHARINDEX(obj, idx)
    while idx >= 1 and not ImStb.is_word_boundary_from_right(obj, idx) do
        idx = ImStb.TEXTEDIT_GETPREVCHARINDEX(obj, idx)
    end
    return (idx < 1) and 1 or idx
end

--- @param obj ImGuiInputTextState
--- @param idx int
local function STB_TEXTEDIT_MOVEWORDRIGHT_MAC(obj, idx)
    local len = obj.TextLen
    idx = ImStb.TEXTEDIT_GETNEXTCHARINDEX(obj, idx)
    while idx <= len and not ImStb.is_word_boundary_from_left(obj, idx) do
        idx = ImStb.TEXTEDIT_GETNEXTCHARINDEX(obj, idx)
    end
    return (idx > len + 1) and len + 1 or idx
end

--- @param obj ImGuiInputTextState
--- @param idx int
local function STB_TEXTEDIT_MOVEWORDRIGHT_WIN(obj, idx)
    idx = ImStb.TEXTEDIT_GETNEXTCHARINDEX(obj, idx)
    local len = obj.TextLen
    while idx <= len and not ImStb.is_word_boundary_from_right(obj, idx) do
        idx = ImStb.TEXTEDIT_GETNEXTCHARINDEX(obj, idx)
    end
    return (idx > len + 1) and len + 1 or idx
end

--- @param obj ImGuiInputTextState
--- @param idx int
function ImStb.TEXTEDIT_MOVEWORDRIGHT(obj, idx)
    local g = obj.Ctx
    if g.IO.ConfigMacOSXBehaviors then
        return STB_TEXTEDIT_MOVEWORDRIGHT_MAC(obj, idx)
    else
        return STB_TEXTEDIT_MOVEWORDRIGHT_WIN(obj, idx)
    end
end

-- Reimplementation of stb_textedit_move_line_start()/stb_textedit_move_line_end() which supports word-wrapping
--- @param obj    ImGuiInputTextState
--- @param state  STB_TexteditState
--- @param cursor int
function ImStb.TEXTEDIT_MOVELINESTART(obj, state, cursor)
    if state.single_line then
        return 1
    end

    if obj.WrapWidth > 0.0 then
        local g = obj.Ctx
        local bol = ImStd.ImStrbol(obj.TextSrc, cursor, 1)
        local p = bol
        local text_end = obj.TextLen + 1 -- End of line would be enough
        while p >= bol do
            local eol = ImFontCalcWordWrapPositionEx(g.Font, g.FontSize, obj.TextSrc, p, text_end, obj.WrapWidth, ImDrawTextFlags.WrapKeepBlanks)
            if p == cursor then -- If we are already on a visible beginning-of-line, return real beginning-of-line (would be same as regular handler below)
                return bol
            end
            if eol == cursor and obj.TextA[cursor] ~= 10 and obj.LastMoveDirectionLR == ImGuiDir.Left then
                return bol
            end
            if eol >= cursor then
                return p
            end
            p = (obj.TextSrc[eol] == 10) and eol + 1 or eol
        end
    end

    -- Regular handler, same as stb_textedit_move_line_start()
    while cursor > 1 do
        local prev_cursor = ImStb.TEXTEDIT_GETPREVCHARINDEX(obj, cursor)
        if (ImStb.TEXTEDIT_GETCHAR(obj, prev_cursor) == STB_TEXTEDIT_NEWLINE) then
            break
        end
        cursor = prev_cursor
    end
    return cursor
end

--- @param obj    ImGuiInputTextState
--- @param state  STB_TexteditState
--- @param cursor int
function ImStb.TEXTEDIT_MOVELINEEND(obj, state, cursor)
    local n = ImStb.TEXTEDIT_STRINGLEN(obj)
    if state.single_line then
        return n + 1
    end

    if obj.WrapWidth > 0.0 then
        local g = obj.Ctx
        local p = ImStd.ImStrbol(obj.TextSrc, cursor, 1)
        local text_end = obj.TextLen + 1 -- End of line would be enough
        while p < text_end do
            local eol = ImFontCalcWordWrapPositionEx(g.Font, g.FontSize, obj.TextSrc, p, text_end, obj.WrapWidth, ImDrawTextFlags.WrapKeepBlanks)
            cursor = eol
            if eol == cursor and obj.LastMoveDirectionLR ~= ImGuiDir.Left then -- If we are already on a visible end-of-line, switch to regular handle
                break
            end
            if eol > cursor then
                return cursor
            end
            p = (obj.TextSrc[eol] == 10) and eol + 1 or eol
        end
    end

    -- Regular handler, same as stb_textedit_move_line_end()
    while (cursor < n and ImStb.TEXTEDIT_GETCHAR(obj, cursor) ~= STB_TEXTEDIT_NEWLINE) do
        cursor = ImStb.TEXTEDIT_GETNEXTCHARINDEX(obj, cursor)
    end
    return cursor
end

--- @param obj ImGuiInputTextState
--- @param pos int
--- @param n   int
function ImStb.TEXTEDIT_DELETECHARS(obj, pos, n)
    IM_ASSERT(obj.TextSrc == obj.TextA.Data)
    ImStd.memmove(obj.TextA.Data, pos, obj.TextA.Data, pos + n, obj.TextLen - n - pos + 2)
    obj.EditedBefore = true
    obj.EditedThisFrame = true
    obj.TextLen = obj.TextLen - n
end

--- @param obj          ImGuiInputTextState
--- @param pos          int
--- @param new_text     ImStringBuffer
--- @param new_text_pos int
--- @param new_text_len int
function ImStb.TEXTEDIT_INSERTCHARS(obj, pos, new_text, new_text_pos, new_text_len)
    local is_resizable = bit32.band(obj.Flags, ImGuiInputTextFlags.CallbackResize) ~= 0
    local text_len = obj.TextLen
    IM_ASSERT(pos <= text_len + 1)

    -- We support partial insertion (with a mod in stb_textedit)
    local avail = obj.BufCapacity - 1 - obj.TextLen
    if not is_resizable and new_text_len > avail then
        new_text_len = math.floor(ImStd.ImTextFindValidUtf8CodepointEnd(new_text, new_text_pos, new_text_len + 1, avail) - new_text_pos) -- Truncate to closest UTF-8 codepoint. Alternative: return 0 to cancel insertion
    end
    if new_text_len == 0 then
        return 0
    end

    -- Grow internal buffer if needed
    IM_ASSERT(obj.TextSrc == obj.TextA.Data)
    if text_len + new_text_len + 1 > obj.TextA.Size and is_resizable then
        obj.TextA:resize(text_len + ImClamp(new_text_len, 32, ImMax(256, new_text_len)) + 1)
        obj.TextSrc = obj.TextA.Data
    end

    local text = obj.TextA.Data
    if pos ~= text_len + 1 then
        ImStd.memmove(text, pos + new_text_len, text, pos, text_len - pos + 1)
    end
    ImStd.memmove(text, pos, new_text, new_text_pos, new_text_len)

    obj.EditedBefore = true
    obj.EditedThisFrame = true
    obj.TextLen = obj.TextLen + new_text_len
    obj.TextA[obj.TextLen + 1] = 0

    return new_text_len
end

stbte = IM_INCLUDE"imstb_textedit.lua"

--- @param str      ImGuiInputTextState
--- @param state    STB_TexteditState
--- @param text     IMSTB_TEXTEDIT_CHARTYPE[]
--- @param text_len int
function ImStb.stb_textedit_replace(str, state, text, text_len)
    stbte.makeundo_replace(str, state, 1, str.TextLen, text_len)
    ImStb.TEXTEDIT_DELETECHARS(str, 1, str.TextLen)
    state.cursor = 1
    state.select_start = 1
    state.select_end = 1
    if text_len <= 0 then
        return
    end

    local text_len_inserted = ImStb.TEXTEDIT_INSERTCHARS(str, 1, text, 1, text_len)
    if text_len_inserted > 0 then
        state.cursor = text_len + 1
        state.select_start = text_len + 1
        state.select_end = text_len + 1
        state.has_preferred_x = false

        return
    end

    IM_ASSERT(false) -- Failed to insert character, normally shouldn't happen because of how we currently use stb_textedit_replace()
end

local MT = ImGui.GetMetatables()

do

--- @param key int
function MT.ImGuiInputTextState:OnKeyPressed(key)
    stbte.key(self, self.Stb, key)
    self.CursorFollow = true
    self:CursorAnimReset()
    local key_u = bit32.band(key, bit32.bnot(STB_TEXTEDIT_K_SHIFT))
    if key_u == STB_TEXTEDIT_K_LEFT or key_u == STB_TEXTEDIT_K_LINESTART or key_u == STB_TEXTEDIT_K_TEXTSTART or key_u == STB_TEXTEDIT_K_BACKSPACE or key_u == STB_TEXTEDIT_K_WORDLEFT then
        self.LastMoveDirectionLR = ImGuiDir.Left
    elseif key_u == STB_TEXTEDIT_K_RIGHT or key_u == STB_TEXTEDIT_K_LINEEND or key_u == STB_TEXTEDIT_K_TEXTEND or key_u == STB_TEXTEDIT_K_DELETE or key_u == STB_TEXTEDIT_K_WORDRIGHT then
        self.LastMoveDirectionLR = ImGuiDir.Right
    end
end

local utf8 = {0, 0, 0, 0, 0}

--- @param c unsigned_int
function MT.ImGuiInputTextState:OnCharPressed(c)
    for i = 1, 5 do utf8[i] = 0 end

    -- Convert the key to a UTF8 byte sequence.
    -- The changes we had to make to stb_textedit_key made it very much UTF-8 specific which is not too great.
    ImStd.ImTextCharToUtf8(utf8, c)
    stbte.text(self, self.Stb, utf8, ImStd.ImStrlen(utf8))
    self.CursorFollow = true
    self:CursorAnimReset()
end

-- After a user-input the cursor stays on for a while without blinking
function MT.ImGuiInputTextState:CursorAnimReset() self.CursorAnim = -0.30 end

function MT.ImGuiInputTextState:CursorClamp()
    self.Stb.cursor = ImMin(self.Stb.cursor, self.TextLen + 1)
    self.Stb.select_start = ImMin(self.Stb.select_start, self.TextLen + 1)
    self.Stb.select_end = ImMin(self.Stb.select_end, self.TextLen + 1)
end

function MT.ImGuiInputTextState:HasSelection() return self.Stb.select_start ~= self.Stb.select_end end

function MT.ImGuiInputTextState:SelectAll()
    self.Stb.select_start = 1
    self.Stb.cursor = self.TextLen + 1
    self.Stb.select_end = self.TextLen + 1
    self.Stb.has_preferred_x = false
end

end

function ImGui.PushPasswordFont()
    local g = GImGui
    local backup = g.InputTextPasswordFontBackupBaked
    IM_ASSERT(backup.IndexAdvanceX.Size == 0 and backup.IndexLookup.Size == 0)
    local glyph = g.FontBaked:FindGlyph(42) -- '*'
    g.InputTextPasswordFontBackupFlags = g.Font.Flags
    backup.FallbackGlyphIndex = g.FontBaked.FallbackGlyphIndex
    backup.FallbackAdvanceX = g.FontBaked.FallbackAdvanceX
    backup.IndexLookup:swap(g.FontBaked.IndexLookup)
    backup.IndexAdvanceX:swap(g.FontBaked.IndexAdvanceX)
    g.Font.Flags = bit32.bor(g.Font.Flags, ImFontFlags.NoLoadGlyphs)
    g.FontBaked.FallbackGlyphIndex = g.FontBaked.Glyphs:index_from_ptr(glyph) + 1
    g.FontBaked.FallbackAdvanceX = glyph.AdvanceX
end

function ImGui.PopPasswordFont()
    local g = GImGui
    local backup = g.InputTextPasswordFontBackupBaked
    g.Font.Flags = g.InputTextPasswordFontBackupFlags
    g.FontBaked.FallbackGlyphIndex = backup.FallbackGlyphIndex
    g.FontBaked.FallbackAdvanceX = backup.FallbackAdvanceX
    g.FontBaked.IndexLookup:swap(backup.IndexLookup)
    g.FontBaked.IndexAdvanceX:swap(backup.IndexAdvanceX)
    IM_ASSERT(backup.IndexAdvanceX.Size == 0 and backup.IndexLookup.Size == 0)
end

--- @param ctx                        ImGuiContext
--- @param state                      ImGuiInputTextState
--- @param char                       unsigned_int
--- @param callback?                  ImGuiInputTextCallback
--- @param user_data                  any
--- @param input_source_is_clipboard? bool
--- @return unsigned_int out_char
--- @return bool
local function InputTextFilterCharacter(ctx, state, char, callback, user_data, input_source_is_clipboard)
    if input_source_is_clipboard == nil then input_source_is_clipboard = false end

    IM_ASSERT(state ~= nil)

    local c = char
    local flags = state.Flags

    -- Filter non-printable (NB: isprint is unreliable! see #2467)
    local apply_named_filters = true
    if c < 0x20 then
        local pass = false
        pass = pass or (c == 10) and (bit32.band(flags, ImGuiInputTextFlags.Multiline) ~= 0) -- Note that an Enter KEY will emit \r and be ignored (we poll for KEY in InputText() code)
        if c == 10 and input_source_is_clipboard and (bit32.band(flags, ImGuiInputTextFlags.Multiline) == 0) then -- In single line mode, replace \n with a space
            char = 32
            c = 32
            pass = true
        end
        pass = pass or (c == 10) and (bit32.band(flags, ImGuiInputTextFlags.Multiline) ~= 0)
        pass = pass or (c == 9) and (bit32.band(flags, ImGuiInputTextFlags.AllowTabInput) ~= 0) -- tab
        if not pass then
            return char, false
        end
        apply_named_filters = false -- Override named filters below so newline and tabs can still be inserted.
    end

    if not input_source_is_clipboard then
        -- We ignore Ascii representation of delete (emitted from Backspace on OSX, see #2578, #2817)
        if c == 127 then
            return char, false
        end

        -- Filter private Unicode range. GLFW on OSX seems to send private characters for special keys like arrow keys (FIXME)
        if c >= 0xE000 and c <= 0xF8FF then
            return char, false
        end
    end

    -- Filter Unicode ranges we are not handling in this build
    if c > IM_UNICODE_CODEPOINT_MAX then
        return char, false
    end

    -- Generic named filters
    if apply_named_filters and (bit32.band(flags, bit32.bor(ImGuiInputTextFlags.CharsDecimal, ImGuiInputTextFlags.CharsHexadecimal, ImGuiInputTextFlags.CharsUppercase, ImGuiInputTextFlags.CharsNoBlank, ImGuiInputTextFlags.CharsScientific, ImGuiInputTextFlags.LocalizeDecimalPoint))) ~= 0 then
        -- The standard mandate that programs starts in the "C" locale where the decimal point is '.'.
        -- We don't really intend to provide widespread support for it, but out of empathy for people stuck with using odd API, we support the bare minimum aka overriding the decimal point.
        -- Change the default decimal_point with:
        --   ImGui::GetPlatformIO()->Platform_LocaleDecimalPoint = *localeconv()->decimal_point;
        -- Users of non-default decimal point (in particular ',') may be affected by word-selection logic (is_word_boundary_from_right/is_word_boundary_from_left) functions.
        local g = ctx
        local c_decimal_point = g.PlatformIO.Platform_LocaleDecimalPoint
        if bit32.band(flags, bit32.bor(ImGuiInputTextFlags.CharsDecimal, ImGuiInputTextFlags.CharsScientific, ImGuiInputTextFlags.LocalizeDecimalPoint)) ~= 0 then
            if c == 46 or c == 44 then -- '.' or ','
                c = c_decimal_point
            end
        end

        -- Full-width -> half-width conversion for numeric fields: https://en.wikipedia.org/wiki/Halfwidth_and_Fullwidth_Forms_(Unicode_block)
        -- While this is mostly convenient, this has the side-effect for uninformed users accidentally inputting full-width characters that they may
        -- scratch their head as to why it works in numerical fields vs in generic text fields it would require support in the font.
        if bit32.band(flags, bit32.bor(ImGuiInputTextFlags.CharsDecimal, ImGuiInputTextFlags.CharsScientific, ImGuiInputTextFlags.CharsHexadecimal)) ~= 0 then
            if c >= 0xFF01 and c <= 0xFF5E then
                c = c - 0xFF01 + 0x21
            end
        end

        -- Allow 0-9 . - + * /
        if bit32.band(flags, ImGuiInputTextFlags.CharsDecimal) ~= 0 then
            if not (c >= 48 and c <= 57) and (c ~= c_decimal_point) and (c ~= 45) and (c ~= 43) and (c ~= 42) and (c ~= 47) then -- 0-9 . - + * /
                return char, false
            end
        end

        -- Allow 0-9 . - + * / e E
        if bit32.band(flags, ImGuiInputTextFlags.CharsScientific) ~= 0 then
            if not (c >= 48 and c <= 57) and (c ~= c_decimal_point) and (c ~= 45) and (c ~= 43) and (c ~= 42) and (c ~= 47) and (c ~= 101) and (c ~= 69) then -- 0-9 . - + * / e E
                return char, false
            end
        end

        -- Allow 0-9 a-F A-F
        if bit32.band(flags, ImGuiInputTextFlags.CharsHexadecimal) ~= 0 then
            if not (c >= 48 and c <= 57) and not (c >= 97 and c <= 102) and not (c >= 65 and c <= 70) then -- 0-9 a-f A-F
                return char, false
            end
        end

        -- Turn a-z into A-Z
        if bit32.band(flags, ImGuiInputTextFlags.CharsUppercase) ~= 0 then
            if c >= 97 and c <= 122 then -- a-z
                c = c + (65 - 97) -- 'A' - 'a'
            end
        end

        if bit32.band(flags, ImGuiInputTextFlags.CharsNoBlank) ~= 0 then
            if ImStd.ImCharIsBlankW(c) then
                return char, false
            end
        end

        char = c
    end

    -- Custom callback filter
    if bit32.band(flags, ImGuiInputTextFlags.CallbackCharFilter) ~= 0 then
        local g = GImGui
        local callback_data = ImGuiInputTextCallbackData()
        callback_data.Ctx = g
        callback_data.ID = state.ID
        callback_data.Flags = flags
        callback_data.EventFlag = ImGuiInputTextFlags.CallbackCharFilter
        callback_data.EventChar = c
        callback_data.EventActivated = (state ~= nil and g.ActiveId == state.ID and g.ActiveIdIsJustActivated)
        callback_data.CursorPos = state.Stb.cursor
        callback_data.SelectionStart = state.Stb.select_start
        callback_data.SelectionEnd = state.Stb.select_end
        callback_data.UserData = user_data
        if callback(callback_data) ~= 0 then
            return char, false
        end
        char = callback_data.EventChar
        if not callback_data.EventChar then
            return char, false
        end
    end

    return char, true
end

-- Find the shortest single replacement we can make to get from old_buf to new_buf
-- Note that this doesn't directly alter state->TextA, state->TextLen. They are expected to be made valid separately.
-- FIXME: Ideally we should transition toward (1) making InsertChars()/DeleteChars() update undo-stack (2) discourage (and keep reconcile) or obsolete (and remove reconcile) accessing buffer directly
--- @param state      ImGuiInputTextState
--- @param old_buf    ImStringBuffer
--- @param old_length int
--- @param new_buf    ImStringBuffer
--- @param new_length int
local function InputTextReconcileUndoState(state, old_buf, old_length, new_buf, new_length)
    local shorter_length = ImMin(old_length, new_length)
    local first_diff
    for i = 1, shorter_length do
        first_diff = i
        if old_buf[first_diff] ~= new_buf[first_diff] then
            break
        end
    end
    if first_diff == old_length + 1 and first_diff == new_length + 1 then
        return
    end

    local old_last_diff = old_length
    local new_last_diff = new_length
    while old_last_diff >= first_diff and new_last_diff >= first_diff do
        if old_buf[old_last_diff] ~= new_buf[new_last_diff] then
            break
        end

        old_last_diff = old_last_diff - 1
        new_last_diff = new_last_diff - 1
    end

    local insert_len = new_last_diff - first_diff + 1
    local delete_len = old_last_diff - first_diff + 1
    if insert_len > 0 or delete_len > 0 then
        local undostate = state.Stb.undostate
        local p = stbte.createundo(undostate, first_diff, delete_len, insert_len)
        if p then
            for i = 0, delete_len - 1 do
                undostate.undo_char[p + i] = old_buf[first_diff + i]
            end
        end
    end
end

--- @param id ImGuiID
function ImGui.InputTextDeactivateHook(id)
    local g = GImGui
    local state = g.InputTextState
    if id == 0 or state.ID ~= id or g.ActiveId ~= id then
        return
    end
    if not state.EditedBefore then
        return
    end
    -- IMGUI_DEBUG_LOG_ACTIVEID("InputTextDeactivateHook() id = 0x%08X\n", id);

    g.InputTextDeactivatedState.ID = state.ID
    g.InputTextDeactivatedState.ElapseFrame = g.FrameCount + 1
    if bit32.band(state.Flags, ImGuiInputTextFlags.ReadOnly) ~= 0 then
        g.InputTextDeactivatedState.TextA:resize(0) -- In theory this data won't be used, but clear to be neat
    else
        IM_ASSERT(state.TextA.Data ~= nil)
        -- IM_ASSERT(state.TextA[state.TextLen + 1] == 0)
        g.InputTextDeactivatedState.TextA:resize(state.TextLen + 1)
        ImStd.memmove(g.InputTextDeactivatedState.TextA.Data, 1, state.TextA.Data, 1, state.TextLen) -- state.TextLen + 1
    end
end

--- @param flags                  ImGuiInputTextFlags
--- @param line_index             ImGuiTextIndex
--- @param buf                    char[]
--- @param buf_end                int
--- @param wrap_width             float
--- @param max_output_buffer_size int
--- @return int  size
--- @return int? out_buf_end
local function InputTextLineIndexBuild(flags, line_index, buf, buf_end, wrap_width, max_output_buffer_size)
    local g = GImGui
    local size = 0
    local s = 1
    local trailing_line_already_counted = false
    if bit32.band(flags, ImGuiInputTextFlags.WordWrap) ~= 0 then
        while s < buf_end do
            if size <= max_output_buffer_size then
                line_index.Offsets:push_back(s - 1)
            end
            size = size + 1
            s = ImFontCalcWordWrapPositionEx(g.Font, g.FontSize, buf, s, buf_end, wrap_width, ImDrawTextFlags.WrapKeepBlanks)

            if buf[s] == 10 then s = s + 1 end
        end
    elseif buf_end ~= nil then
        while s < buf_end do
            if size <= max_output_buffer_size then
                line_index.Offsets:push_back(s - 1)
            end
            size = size + 1
            s = ImMemchr(buf, 10, s) --[[@as int]] -- FIXME:

            if s then s = s + 1 else s = buf_end end
        end
    else
        -- Inactive path: we don't know buf_end ahead of time.
        local s_eol
        s = 1
        while true do
            if size <= max_output_buffer_size then
                line_index.Offsets:push_back(s - 1)
            end
            size = size + 1

            s_eol = ImMemchr(buf, 10, s)
            if s_eol == nil then
                s = s + ImStd.ImStrlen(buf) - s -- FIXME:
                trailing_line_already_counted = true
                break
            end

            s = s_eol + 1
        end
    end

    local out_buf_end
    if out_buf_end ~= nil then
        out_buf_end = s
        buf_end = s
    end
    if size == 0 then
        line_index.Offsets:push_back(0)
        size = size + 1
    end
    if s > 1 and buf[s - 1] == 10 and not trailing_line_already_counted then
        local old_size = size
        size = size + 1
        if old_size <= max_output_buffer_size then
            line_index.Offsets:push_back(s - 1)
        end
    end
    return size, out_buf_end
end

--- @param t        table
--- @param in_begin int
--- @param in_end   int
--- @param v        int
local function ImLowerBound(t, in_begin, in_end, v)
    local in_p = in_begin
    local count = in_end - in_begin

    local floor = math.floor
    local rshift = bit32.rshift
    while count > 0 do
        local count2 = floor(rshift(count, 1))
        local mid = in_p + count2

        if t[mid] < v then
            in_p = mid + 1
            count = count - count2 - 1
        else
            count = count2
        end
    end

    return in_p
end

--- @param g          ImGuiContext
--- @param state      ImGuiInputTextState
--- @param line_index ImGuiTextIndex
--- @param buf        char[]
--- @param buf_end    int
--- @param cursor_n   int
--- @return ImVec2
local function InputTextLineIndexGetPosOffset(g, state, line_index, buf, buf_end, cursor_n)
    local cursor_ptr = cursor_n

    local it = ImLowerBound(line_index.Offsets, 1, line_index.Offsets.Size + 1, cursor_ptr)

    if it > 1 then
        if it > line_index.Offsets.Size or line_index.Offsets[it] ~= cursor_ptr or (state ~= nil and state.WrapWidth > 0.0 and state.LastMoveDirectionLR == ImGuiDir.Right and
            buf[cursor_ptr - 1] ~= 10 and buf[cursor_ptr - 1] ~= 0) then
            it = it - 1
        end
    end

    local line_no = it
    local line_start = (line_no == 1) and 1 or line_index.Offsets[line_no] + 1

    local offset = ImVec2()
    offset.x = InputTextCalcTextSize(g, buf, line_start, cursor_ptr, buf_end, nil, ImDrawTextFlags.WrapKeepBlanks).x
    offset.y = line_no * g.FontSize

    return offset
end

-- Edit a string of text
--- @param label              string
--- @param hint?              char[]
--- @param buf                char[]
--- @param buf_size           int
--- @param size_arg           ImVec2
--- @param flags              ImGuiInputTextFlags
--- @param callback?          ImGuiInputTextCallback
--- @param callback_user_data any
local HintBufCache = setmetatable({}, { __mode = "k" })
local function HintToBuf(hint)
    local t = HintBufCache[hint]
    if t == nil then
        t = {}
        for i = 1, #hint do t[i] = string.byte(hint, i) end
        t[#hint + 1] = 0
        HintBufCache[hint] = t
    end
    return t
end

function ImGui.InputTextEx(label, hint, buf, buf_size, size_arg, flags, callback, callback_user_data)
    if type(hint) == "string" then hint = HintToBuf(hint) end
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    IM_ASSERT(buf ~= nil and buf_size >= 0)
    IM_ASSERT(not (bit32.band(flags, ImGuiInputTextFlags.CallbackHistory) ~= 0 and bit32.band(flags, ImGuiInputTextFlags.Multiline) ~= 0))        -- Can't use both together (they both use up/down keys)
    IM_ASSERT(not (bit32.band(flags, ImGuiInputTextFlags.CallbackCompletion) ~= 0 and bit32.band(flags, ImGuiInputTextFlags.AllowTabInput) ~= 0)) -- Can't use both together (they both use tab key)
    IM_ASSERT(not (bit32.band(flags, ImGuiInputTextFlags.ElideLeft) ~= 0 and bit32.band(flags, ImGuiInputTextFlags.Multiline) ~= 0))              -- Multiline does not not work with left-trimming
    IM_ASSERT(bit32.band(flags, ImGuiInputTextFlags.WordWrap) == 0 or bit32.band(flags, ImGuiInputTextFlags.Password) == 0)  -- WordWrap does not work with Password mode
    IM_ASSERT(bit32.band(flags, ImGuiInputTextFlags.WordWrap) == 0 or bit32.band(flags, ImGuiInputTextFlags.Multiline) ~= 0) -- WordWrap does not work in single-line mode

    local g = GImGui --[[@as ImGuiContext]]
    local io = g.IO
    local style = g.Style

    local RENDER_SELECTION_WHEN_INACTIVE = false
    local is_multiline = bit32.band(flags, ImGuiInputTextFlags.Multiline) ~= 0

    if is_multiline then -- Open group before calling GetID() because groups tracks id created within their scope (including the scrollbar)
        ImGui.BeginGroup()
    end
    local id = window:GetID(label)
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)
    local frame_size = ImGui.CalcItemSize(size_arg, ImGui.CalcItemWidth(), (is_multiline and g.FontSize * 8.0 or label_size.y) + style.FramePadding.y * 2.0)  -- Arbitrary default of 8 lines high for multi-line
    local total_size = ImVec2(frame_size.x + ((label_size.x > 0.0) and (style.ItemInnerSpacing.x + label_size.x) or 0.0), frame_size.y)

    local frame_bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + frame_size)
    local total_bb = ImRect(frame_bb.Min, frame_bb.Min + total_size)

    local draw_window = window
    local inner_size = ImVec2()
    ImVec2_Copy(inner_size, frame_size)
    local item_data_backup = ImGuiLastItemData()
    if is_multiline then
        local backup_pos = ImVec2()
        ImVec2_Copy(backup_pos, window.DC.CursorPos)
        ImGui.ItemSize(total_bb, style.FramePadding.y)
        local no_clip = (g.InputTextDeactivatedState.ID == id) or (g.ActiveId == id) or (id == g.NavActivateId) -- Mimic some of ItemAdd() logic + add InputTextDeactivatedState.ID check.
        if not ImGui.ItemAdd(total_bb, id, frame_bb, ImGuiItemFlags.Inputable) and not no_clip then
            ImGui.EndGroup()
            return false
        end
        ImGuiLastItemData_Copy(item_data_backup, g.LastItemData)
        ImVec2_Copy(window.DC.CursorPos, backup_pos)

        -- Prevent NavActivation from explicit Tabbing when our widget accepts Tab inputs: this allows cycling through widgets without stopping
        if g.NavActivateId == id and (bit32.band(g.NavActivateFlags, ImGuiActivateFlags.FromTabbing) ~= 0) and (bit32.band(g.NavActivateFlags, ImGuiActivateFlags.FromFocusApi) == 0) and (bit32.band(flags, ImGuiInputTextFlags.AllowTabInput) ~= 0) then
            g.NavActivateId = 0
        end

        -- Prevent NavActivate reactivating in BeginChild() when we are already active
        local backup_activate_id = g.NavActivateId
        if g.ActiveId == id then -- Prevent reactivation
            g.NavActivateId = 0
        end

        -- We reproduce the contents of BeginChildFrame() in order to provide 'label' so our window internal data are easier to read/debug
        ImGui.PushStyleColor(ImGuiCol.ChildBg, style.Colors[ImGuiCol.FrameBg])
        ImGui.PushStyleVar(ImGuiStyleVar.ChildRounding, style.FrameRounding)
        ImGui.PushStyleVar(ImGuiStyleVar.ChildBorderSize, style.FrameBorderSize)
        ImGui.PushStyleVar(ImGuiStyleVar.WindowPadding, ImVec2(0, 0)) -- Ensure no clip rect so mouse hover can reach FramePadding edges
        local child_visible = ImGui.BeginChildEx(label, id, frame_bb:GetSize(), ImGuiChildFlags.Borders, ImGuiWindowFlags.NoMove)
        g.NavActivateId = backup_activate_id
        ImGui.PopStyleVar(3)
        ImGui.PopStyleColor()
        if not child_visible and not no_clip then
            ImGui.EndChild()
            ImGui.EndGroup()
            return false
        end
        draw_window = g.CurrentWindow -- Child window
        draw_window.DC.NavLayersActiveMaskNext = bit32.bor(draw_window.DC.NavLayersActiveMaskNext, bit32.lshift(1, draw_window.DC.NavLayerCurrent)) -- This is to ensure that EndChild() will display a navigation highlight so we can "enter" into it
        ImVec2_Copy(draw_window.DC.CursorPos, draw_window.DC.CursorPos + style.FramePadding)
        inner_size.x = inner_size.x - draw_window.ScrollbarSizes.x

        -- FIXME: Could this be a ImGuiChildFlags to affect the SetLastItemDataForWindow() call?
        g.LastItemData.ID = id
        g.LastItemData.ItemFlags = item_data_backup.ItemFlags
        g.LastItemData.StatusFlags = item_data_backup.StatusFlags
    else
        ImGui.ItemSize(total_bb, style.FramePadding.y)

        if bit32.band(flags, ImGuiInputTextFlags.TempInput) == 0 then
            if not ImGui.ItemAdd(total_bb, id, frame_bb, ImGuiItemFlags.Inputable) then
                return false
            end
        end
    end

    -- Ensure mouse cursor is set even after switching to keyboard/gamepad mode. May generalize further? (#6417)
    local hovered = ImGui.ItemHoverable(frame_bb, id, bit32.bor(g.LastItemData.ItemFlags, ImGuiItemFlags.NoNavDisableMouseHover))
    if hovered then
        ImGui.SetMouseCursor(ImGuiMouseCursor.TextInput)
    end
    if hovered and g.NavHighlightItemUnderNav then
        hovered = false
    end

    -- We are only allowed to access the state if we are already the active widget
    local state = ImGui.GetInputTextState(id)

    if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.ReadOnly) ~= 0 then
        flags = bit32.bor(flags, ImGuiInputTextFlags.ReadOnly)
    end
    local is_readonly = bit32.band(flags, ImGuiInputTextFlags.ReadOnly) ~= 0
    local is_password = bit32.band(flags, ImGuiInputTextFlags.Password) ~= 0
    local is_undoable = bit32.band(flags, ImGuiInputTextFlags.NoUndoRedo) == 0
    local is_resizable = bit32.band(flags, ImGuiInputTextFlags.CallbackResize) ~= 0
    if is_resizable then
        IM_ASSERT(callback ~= nil) -- Must provide a callback if you set the ImGuiInputTextFlags.CallbackResize flag!
    end

    -- Word-wrapping: enforcing a fixed width not altered by vertical scrollbar makes things easier, notably to track cursor reliably and avoid one-frame glitches.
    -- Instead of using ImGuiWindowFlags_AlwaysVerticalScrollbar we account for that space if the scrollbar is not visible.
    local is_wordwrap = bit32.band(flags, ImGuiInputTextFlags.WordWrap) ~= 0
    local wrap_width = 0.0
    if is_wordwrap then
        wrap_width = ImMax(1.0, ImGui.GetContentRegionAvail().x + (draw_window.ScrollbarY and 0.0 or -g.Style.ScrollbarSize))
    end

    local user_clicked = hovered and io.MouseClicked[0]
    local input_requested_by_nav = (g.ActiveId ~= id) and (g.NavActivateId == id) and ((bit32.band(g.NavActivateFlags, ImGuiActivateFlags.PreferInput) ~= 0) or (g.NavInputSource == ImGuiInputSource.Keyboard))
    local input_requested_by_reactivate = (g.InputTextReactivateId == id) -- for io.ConfigInputTextEnterKeepActive
    local input_requested_by_user = (user_clicked) or (g.ActiveId == 0 and bit32.band(flags, ImGuiInputTextFlags.TempInput) ~= 0 and g.InputTextDeactivatedState.ID ~= id)
    local scrollbar_id = (is_multiline and state ~= nil) and ImGui.GetWindowScrollbarID(draw_window, ImGuiAxis.Y) or 0
    local user_scroll_finish = is_multiline and state ~= nil and g.ActiveId == 0 and g.ActiveIdPreviousFrame == scrollbar_id
    local user_scroll_active = is_multiline and state ~= nil and g.ActiveId == scrollbar_id
    local clear_active_id = false
    local select_all = false

    local scroll_y = is_multiline and draw_window.Scroll.y or FLT_MAX

    local init_reload_from_user_buf = (state ~= nil and state.WantReloadUserBuf)
    local init_changed_specs_multiline = (state ~= nil and (state.Stb.single_line ~= (not is_multiline)))
    local init_changed_specs_readonly = (state ~= nil and (bit32.band(bit32.bxor(state.Flags, flags), ImGuiInputTextFlags.ReadOnly) ~= 0)) -- state ~= nil means it's our state
    local init_make_active = (input_requested_by_user or input_requested_by_nav or input_requested_by_reactivate or user_scroll_finish)
    if init_reload_from_user_buf then
        local new_len = ImStd.ImStrlen(buf)
        IM_ASSERT(new_len + 1 <= buf_size, "Is your input buffer properly zero-terminated?")
        state.WantReloadUserBuf = false
        --- @cast state ImGuiInputTextState
        InputTextReconcileUndoState(state, state.TextA.Data, state.TextLen, buf, new_len)
        state.TextA:resize(buf_size + 1)
        state.TextLen = new_len
        ImStd.memmove(state.TextA.Data, 1, buf, 1, state.TextLen + 1)
        state.Stb.select_start = state.ReloadSelectionStart
        state.Stb.cursor = state.ReloadSelectionEnd
        state.Stb.select_end = state.ReloadSelectionEnd -- will be clamped to bounds below
    elseif (init_make_active and g.ActiveId ~= id) or init_changed_specs_multiline or init_changed_specs_readonly then
        -- Access state even if we don't own it yet
        state = g.InputTextState
        state:CursorAnimReset()

        -- Backup state of deactivating item so they'll have a chance to do a write to output buffer on the same frame they report IsItemDeactivatedAfterEdit (#4714)
        if (state.ID ~= id and state.ID == g.ActiveId and (init_make_active and g.ActiveId ~= id)) then
            ImGui.InputTextDeactivateHook(state.ID) -- <-- this is essentially an earlier call to what SetActiveID() would do below.
        end

        -- Take a copy of the initial buffer value.
        -- From the moment we focused we are normally ignoring the content of 'buf' (unless we are in read-only mode)
        local buf_len = ImStd.ImStrlen(buf)
        IM_ASSERT(((buf_len + 1 <= buf_size) or (buf_len == 0 and buf_size == 0)), "Is your input buffer properly zero-terminated?")
        if not user_scroll_finish then
            state.TextToRevertTo:resize(buf_len + 1)
            ImStd.memmove(state.TextToRevertTo.Data, 1, buf, 1, buf_len + 1)
        end

        -- Preserve cursor position and undo/redo stack if we come back to same widget
        -- FIXME: Since we reworked this on 2022/06, may want to differentiate recycle_cursor vs recycle_undostate?
        local recycle_state = (state.ID == id and not init_changed_specs_multiline)
        if (recycle_state and not init_changed_specs_readonly and (state.TextLen ~= buf_len or (state.TextA.Data == nil or ImStd.strncmp(state.TextA.Data, buf, buf_len) ~= 0))) then
            recycle_state = false
        end

        -- Start edition
        state.ID = id
        state.TextLen = buf_len
        state.EditedBefore = false
        if not is_readonly then
            state.TextA:resize(buf_size + 1)
            ImStd.memmove(state.TextA.Data, 1, buf, 1, state.TextLen + 1)
        end

        -- Find initial scroll position for right alignment
        ImVec2_Copy(state.Scroll, ImVec2(0.0, 0.0))
        if bit32.band(flags, ImGuiInputTextFlags.ElideLeft) ~= 0 then
            state.Scroll.x = state.Scroll.x + ImMax(0.0, ImGui.CalcTextSize(table.concat(buf)).x - frame_size.x + style.FramePadding.x * 2.0) -- FIXME: no table.concat here
        end

        -- Recycle existing cursor/selection/undo stack but clamp position
        -- Note a single mouse click will override the cursor/position immediately by calling stb_textedit_click handler
        if not recycle_state then
            stbte.initialize_state(state.Stb, not is_multiline)
        end

        if not is_multiline then
            if bit32.band(flags, ImGuiInputTextFlags.AutoSelectAll) ~= 0 then
                select_all = true
            end
            if input_requested_by_nav and (not recycle_state or (bit32.band(g.NavActivateFlags, ImGuiActivateFlags.TryToPreserveState) == 0)) then
                select_all = true
            end
            if user_clicked and io.KeyCtrl then
                select_all = true
            end
        end

        if bit32.band(flags, ImGuiInputTextFlags.AlwaysOverwrite) ~= 0 then
            state.Stb.insert_mode = true -- stb field name is indeed incorrect (see #2863)
        end
    end

    local is_osx = io.ConfigMacOSXBehaviors

    if init_make_active and g.ActiveId ~= id then
        IM_ASSERT(state ~= nil and state.ID == id)
        ImGui.SetActiveID(id, window)
        ImGui.SetFocusID(id, window)
        ImGui.FocusWindow(window)
        if input_requested_by_nav then
            ImGui.SetNavCursorVisibleAfterMove()
        end
    end
    if g.ActiveId == id then
        -- Declare some inputs, the other are registered and polled via Shortcut() routing system
        -- FIXME: The reason we don't use Shortcut() is we would need a routing flag to specify multiple mods, or to all mods combination into individual shortcuts
        local always_owned_keys = { ImGuiKey.LeftArrow, ImGuiKey.RightArrow, ImGuiKey.Delete, ImGuiKey.Backspace, ImGuiKey.Home, ImGuiKey.End }
        for _, key in ipairs(always_owned_keys) do
            ImGui.SetKeyOwner(key, id)
        end
        if user_clicked then
            ImGui.SetKeyOwner(ImGuiKey.MouseLeft, id)
        end
        g.ActiveIdUsingNavDirMask = bit32.bor(g.ActiveIdUsingNavDirMask, bit32.lshift(1, ImGuiDir.Left), bit32.lshift(1, ImGuiDir.Right))
        if is_multiline or (bit32.band(flags, ImGuiInputTextFlags.CallbackHistory) ~= 0) then
            g.ActiveIdUsingNavDirMask = bit32.bor(g.ActiveIdUsingNavDirMask, bit32.lshift(1, ImGuiDir.Up), bit32.lshift(1, ImGuiDir.Down))
            ImGui.SetKeyOwner(ImGuiKey.UpArrow, id)
            ImGui.SetKeyOwner(ImGuiKey.DownArrow, id)
        end
        if is_multiline then
            ImGui.SetKeyOwner(ImGuiKey.PageUp, id)
            ImGui.SetKeyOwner(ImGuiKey.PageDown, id)
        end
        -- FIXME: May be a problem to always steal Alt on OSX, would ideally still allow an uninterrupted Alt down-up to toggle menu
        if is_osx then
            ImGui.SetKeyOwner(ImGuiMod_Alt, id)
        end

        -- Expose scroll in a manner that is agnostic to us using a child window
        if is_multiline and state ~= nil then
            state.Scroll.y = draw_window.Scroll.y
        end

        -- Read-only mode always ever read from source buffer. Refresh TextLen when active.
        if is_readonly and state ~= nil then
            state.TextLen = ImStd.ImStrlen(buf)
        end
        if state ~= nil then
            state:CursorClamp()
        end
        -- if is_readonly and state ~= nil then
        --     state.TextA:clear() -- Uncomment to facilitate debugging, but we otherwise prefer to keep/amortize th allocation.
        -- end
    end
    if state ~= nil then
        state.TextSrc = is_readonly and buf or state.TextA.Data
    end

    -- We have an edge case if ActiveId was set through another widget (e.g. widget being swapped), clear id immediately (don't wait until the end of the function)
    if g.ActiveId == id and state == nil then
        ImGui.ClearActiveID()
    end

    -- Release focus when we click outside
    if g.ActiveId == id and io.MouseClicked[0] and not init_make_active then
        clear_active_id = true
    end

    -- Lock the decision of whether we are going to take the path displaying the cursor or selection
    local render_cursor = (g.ActiveId == id) or (state and user_scroll_active) --[[@as bool]]
    local render_selection = state and (state:HasSelection() or select_all) and (RENDER_SELECTION_WHEN_INACTIVE or render_cursor)
    local value_changed = false
    local validated = false

    -- Select the buffer to render
    local buf_display_from_state = (render_cursor or render_selection or g.ActiveId == id) and not is_readonly and state ~= nil
    local is_displaying_hint = (hint ~= nil and (buf_display_from_state and state.TextA.Data or buf)[1] == 0)

    -- Password pushes a temporary font with only a fallback glyph
    if is_password and not is_displaying_hint then
        ImGui.PushPasswordFont()
    end

    if state ~= nil and state.ID == id then
        state.Flags = flags

        -- Word-wrapping: attempt to keep cursor in view while resizing frame/parent (FIXME-WORDWRAP: would be better to preserve same relative offset)
        if is_wordwrap and state.WrapWidth ~= wrap_width then
            state.CursorCenterY = true
            state.WrapWidth = wrap_width
            render_cursor = true
        end
    end

    -- Process mouse inputs and character inputs
    if g.ActiveId == id then
        --- @cast state ImGuiInputTextState
        IM_ASSERT(state ~= nil)
        state.EditedThisFrame = false
        state.BufCapacity = buf_size
        state.WrapWidth = wrap_width

        -- Although we are active we don't prevent mouse from hovering other elements unless we are interacting right now with the widget.
        -- Down the line we should have a cleaner library-wide concept of Selected vs Active
        g.ActiveIdAllowOverlap = not io.MouseDown[0]

        -- Edit in progress
        local mouse_x = (io.MousePos.x - frame_bb.Min.x - style.FramePadding.x) + state.Scroll.x
        local mouse_y = (is_multiline and (io.MousePos.y - draw_window.DC.CursorPos.y) or (g.FontSize * 0.5))

        if select_all then
            state:SelectAll()
            state.SelectedAllMouseLock = true
        elseif hovered and io.MouseClickedCount[0] >= 2 and not io.KeyShift then
            stbte.click(state, state.Stb, mouse_x, mouse_y)
            local multiclick_count = (io.MouseClickedCount[0] - 2)
            if multiclick_count % 2 == 0 then
                -- Double-click: Select word
                -- We always use the "Mac" word advance for double-click select vs Ctrl+Right which use the platform dependent variant:
                -- FIXME: There are likely many ways to improve this behavior, but there's no "right" behavior (depends on use-case, software, OS)
                local is_bol = (state.Stb.cursor == 1) or ImStb.TEXTEDIT_GETCHAR(state, state.Stb.cursor - 1) == 10
                if stbte.HAS_SELECTION(state.Stb) or not is_bol then
                    state:OnKeyPressed(STB_TEXTEDIT_K_WORDLEFT)
                end
                -- state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_WORDRIGHT, STB_TEXTEDIT_K_SHIFT))
                if not stbte.HAS_SELECTION(state.Stb) then
                    stbte.prep_selection_at_cursor(state.Stb)
                end
                state.Stb.cursor = STB_TEXTEDIT_MOVEWORDRIGHT_MAC(state, state.Stb.cursor)
                state.Stb.select_end = state.Stb.cursor
                stbte.clamp(state, state.Stb)
            else
                -- Triple-click: Select line
                local is_eol = ImStb.TEXTEDIT_GETCHAR(state, state.Stb.cursor) == 10
                state.WrapWidth = 0.0 -- Temporarily disable wrapping so we use real line start
                state:OnKeyPressed(STB_TEXTEDIT_K_LINESTART)
                state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_LINEEND, STB_TEXTEDIT_K_SHIFT))
                state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_RIGHT, STB_TEXTEDIT_K_SHIFT))
                state.WrapWidth = wrap_width
                if not is_eol and is_multiline then
                    state.Stb.select_start, state.Stb.select_end = state.Stb.select_end, state.Stb.select_start
                    state.Stb.cursor = state.Stb.select_end
                end
                state.CursorFollow = false
            end
            state:CursorAnimReset()
        elseif io.MouseClicked[0] and not state.SelectedAllMouseLock then
            if hovered then
                if io.KeyShift then
                    stbte.drag(state, state.Stb, mouse_x, mouse_y)
                else
                    stbte.click(state, state.Stb, mouse_x, mouse_y)
                end
                state:CursorAnimReset()
            end
        elseif io.MouseDown[0] and not state.SelectedAllMouseLock and (io.MouseDelta.x ~= 0.0 or io.MouseDelta.y ~= 0.0) then
            stbte.drag(state, state.Stb, mouse_x, mouse_y)
            state:CursorAnimReset()
            state.CursorFollow = true
        end
        if state.SelectedAllMouseLock and not io.MouseDown[0] then
            state.SelectedAllMouseLock = false
        end

        if bit32.band(flags, ImGuiInputTextFlags.AllowTabInput) ~= 0 and not is_readonly then
            if ImGui.Shortcut(ImGuiKey.Tab, ImGuiInputFlags.Repeat, id) then
                local c = 9 -- Insert TAB
                local ret2
                c, ret2 = InputTextFilterCharacter(g, state, c, callback, callback_user_data)
                if ret2 then
                    state:OnCharPressed(c)
                end
            end

            -- FIXME: Implement Shift+Tab
        end

        -- Process regular text input
        local ignore_char_inputs = io.KeyCtrl and not io.KeyAlt
        if io.InputQueueCharacters.Size > 0 then
            if not ignore_char_inputs and not is_readonly and not input_requested_by_nav then
                for n = 1, io.InputQueueCharacters.Size do
                    repeat
                    -- Insert character if they pass filtering
                    local c = io.InputQueueCharacters[n]
                    if c == 9 then -- Skip Tab, see above
                        break
                    end

                    local ret2
                    c, ret2 = InputTextFilterCharacter(g, state, c, callback, callback_user_data)
                    if ret2 then
                        state:OnCharPressed(c)
                    end

                    until true
                end
            end

            -- Consume characters
            io.InputQueueCharacters:resize(0)
        end
    end

    -- Process other shortcuts/key-presses
    local revert_edit = false
    if g.ActiveId == id and not g.ActiveIdIsJustActivated and not clear_active_id then
        IM_ASSERT(state ~= nil)
        --- @cast state ImGuiInputTextState

        local row_count_per_page = ImMax(ImTrunc((inner_size.y - style.FramePadding.y) / g.FontSize), 1)
        state.Stb.row_count_per_page = row_count_per_page

        local k_mask = (io.KeyShift and STB_TEXTEDIT_K_SHIFT or 0)
        local is_wordmove_key_down = is_osx and io.KeyAlt or io.KeyCtrl
        local is_startend_key_down = is_osx and io.KeyCtrl and not io.KeySuper and not io.KeyAlt

        local f_repeat = ImGuiInputFlags.Repeat
        local is_cut   = (ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.X), f_repeat, id) or ImGui.Shortcut(bit32.bor(ImGuiMod_Shift, ImGuiKey.Delete), f_repeat, id)) and not is_readonly and not is_password and (not is_multiline or state:HasSelection())
        local is_copy  = (ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.C), 0,        id) or ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl,  ImGuiKey.Insert), 0,        id)) and not is_password and (not is_multiline or state:HasSelection())
        local is_paste = (ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.V), f_repeat, id) or ImGui.Shortcut(bit32.bor(ImGuiMod_Shift, ImGuiKey.Insert), f_repeat, id)) and not is_readonly
        local is_undo  = (ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.Z), f_repeat, id)) and not is_readonly and is_undoable
        local is_redo  = (ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.Y), f_repeat, id) or ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiMod_Shift, ImGuiKey.Z), f_repeat, id)) and not is_readonly and is_undoable
        local is_select_all = ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.A), 0, id)

        local nav_gamepad_active  = (bit32.band(io.ConfigFlags, ImGuiConfigFlags.NavEnableGamepad) ~= 0) and (bit32.band(io.BackendFlags, ImGuiBackendFlags.HasGamepad) ~= 0)
        local is_enter            = ImGui.Shortcut(ImGuiKey.Enter, f_repeat, id) or ImGui.Shortcut(ImGuiKey.KeypadEnter, f_repeat, id)
        local is_ctrl_enter       = ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.Enter), f_repeat, id) or ImGui.Shortcut(bit32.bor(ImGuiMod_Ctrl, ImGuiKey.KeypadEnter), f_repeat, id)
        local is_shift_enter      = ImGui.Shortcut(bit32.bor(ImGuiMod_Shift, ImGuiKey.Enter), f_repeat, id) or ImGui.Shortcut(bit32.bor(ImGuiMod_Shift, ImGuiKey.KeypadEnter), f_repeat, id)
        local is_gamepad_validate = nav_gamepad_active and ImGui.IsKeyPressed(ImGuiKey.NavGamepadActivate, false)
        local is_cancel           = ImGui.Shortcut(ImGuiKey.Escape, f_repeat, id) or (nav_gamepad_active and ImGui.Shortcut(ImGuiKey.NavGamepadCancel, f_repeat, id))

        if ImGui.IsKeyPressed(ImGuiKey.LeftArrow) then
            state:OnKeyPressed(bit32.bor(is_startend_key_down and STB_TEXTEDIT_K_LINESTART or (is_wordmove_key_down and STB_TEXTEDIT_K_WORDLEFT or STB_TEXTEDIT_K_LEFT), k_mask))
        elseif ImGui.IsKeyPressed(ImGuiKey.RightArrow) then
            state:OnKeyPressed(bit32.bor(is_startend_key_down and STB_TEXTEDIT_K_LINEEND or (is_wordmove_key_down and STB_TEXTEDIT_K_WORDRIGHT or STB_TEXTEDIT_K_RIGHT), k_mask))
        elseif ImGui.IsKeyPressed(ImGuiKey.UpArrow) and is_multiline then
            if io.KeyCtrl then
                ImGui.SetScrollY(draw_window, ImMax(draw_window.Scroll.y - g.FontSize, 0.0))
            else
                state:OnKeyPressed(bit32.bor(is_startend_key_down and STB_TEXTEDIT_K_TEXTSTART or STB_TEXTEDIT_K_UP, k_mask))
            end
        elseif ImGui.IsKeyPressed(ImGuiKey.DownArrow) and is_multiline then
            if io.KeyCtrl then
                ImGui.SetScrollY(draw_window, ImMin(draw_window.Scroll.y + g.FontSize, ImGui.GetScrollMaxY()))
            else
                state:OnKeyPressed(bit32.bor(is_startend_key_down and STB_TEXTEDIT_K_TEXTEND or STB_TEXTEDIT_K_DOWN, k_mask))
            end
        elseif ImGui.IsKeyPressed(ImGuiKey.PageUp) and is_multiline then
            state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_PGUP, k_mask))
            scroll_y = scroll_y - row_count_per_page * g.FontSize
        elseif ImGui.IsKeyPressed(ImGuiKey.PageDown) and is_multiline then
            state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_PGDOWN, k_mask))
            scroll_y = scroll_y + row_count_per_page * g.FontSize
        elseif ImGui.IsKeyPressed(ImGuiKey.Home) then
            state:OnKeyPressed(io.KeyCtrl and bit32.bor(STB_TEXTEDIT_K_TEXTSTART, k_mask) or bit32.bor(STB_TEXTEDIT_K_LINESTART, k_mask))
        elseif ImGui.IsKeyPressed(ImGuiKey.End) then
            state:OnKeyPressed(io.KeyCtrl and bit32.bor(STB_TEXTEDIT_K_TEXTEND, k_mask) or bit32.bor(STB_TEXTEDIT_K_LINEEND, k_mask))
        elseif ImGui.IsKeyPressed(ImGuiKey.Delete) and not is_readonly and not is_cut then
            if not state:HasSelection() then
                if is_wordmove_key_down then
                    state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_WORDRIGHT, STB_TEXTEDIT_K_SHIFT))
                end
            end
            state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_DELETE, k_mask))
        elseif ImGui.IsKeyPressed(ImGuiKey.Backspace) and not is_readonly then
            if not state:HasSelection() then
                if is_wordmove_key_down then
                    state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_WORDLEFT, STB_TEXTEDIT_K_SHIFT))
                elseif is_osx and io.KeyCtrl and not io.KeyAlt and not io.KeySuper then
                    state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_LINESTART, STB_TEXTEDIT_K_SHIFT))
                end
            end
            state:OnKeyPressed(bit32.bor(STB_TEXTEDIT_K_BACKSPACE, k_mask))
        elseif is_enter or is_ctrl_enter or is_shift_enter or is_gamepad_validate then
            local ctrl_enter_for_new_line = bit32.band(flags, ImGuiInputTextFlags.CtrlEnterForNewLine) ~= 0
            local is_new_line = is_multiline and not is_gamepad_validate and (is_shift_enter or (is_enter and not ctrl_enter_for_new_line) or (is_ctrl_enter and ctrl_enter_for_new_line))
            if not is_new_line then
                validated = true
                clear_active_id = true
                if io.ConfigInputTextEnterKeepActive and not is_multiline and not is_ctrl_enter and not is_shift_enter then
                    state:SelectAll()
                    g.InputTextReactivateId = id
                end
            elseif not is_readonly then
                local c = 10 -- Insert new line
                local ret2
                c, ret2 = InputTextFilterCharacter(g, state, c, callback, callback_user_data)
                if ret2 then
                    state:OnCharPressed(c)
                end
            end
        elseif is_cancel then
            if bit32.band(flags, ImGuiInputTextFlags.EscapeClearsAll) ~= 0 then
                if state.TextA.Data[1] ~= 0 then
                    revert_edit = true
                else
                    render_cursor = false
                    render_selection = false
                    clear_active_id = true
                end
            else
                clear_active_id = true
                revert_edit = true
                render_cursor = false
                render_selection = false
            end
        elseif is_undo or is_redo then
            state:OnKeyPressed(is_undo and STB_TEXTEDIT_K_UNDO or STB_TEXTEDIT_K_REDO)
            state:ClearSelection()
        elseif is_select_all then
            state:SelectAll()
            state.CursorFollow = true
        elseif is_cut or is_copy then
            if g.PlatformIO.Platform_SetClipboardTextFn ~= nil then
                local ib = state:HasSelection() and ImMin(state.Stb.select_start, state.Stb.select_end) or 1
                local ie = state:HasSelection() and ImMax(state.Stb.select_start, state.Stb.select_end) or state.TextLen + 1
                g.TempBuffer:reserve(ie - ib + 1)
                ImStd.memmove(g.TempBuffer.Data, 1, state.TextSrc, ib, ie - ib)
                g.TempBuffer.Data[ie - ib + 1] = 0
                ImGui.SetClipboardText(ImGui._ByteArrayToString(g.TempBuffer.Data, 1, ie - ib + 1))
            end
            if is_cut then
                if not state:HasSelection() then
                    state:SelectAll()
                end
                state.CursorFollow = true
                stbte.cut(state, state.Stb)
            end
        elseif is_paste then
            local clipboard = ImGui.GetClipboardText()
            if clipboard then
                local clipboard_len = #clipboard
                local clipboard_end = clipboard_len + 1
                local clipboard_filtered = ImVector()
                clipboard_filtered:reserve(clipboard_len + 1)
                local s
                local i = 1
                while i <= clipboard_len do
                    repeat
                    s = string.byte(clipboard, i)
                    local c, ret2
                    local in_len
                    in_len, c = ImStd.ImTextCharFromUtf8(clipboard, i, clipboard_end)
                    i = i + in_len
                    c, ret2 = InputTextFilterCharacter(g, state, c, callback, callback_user_data, true)
                    if ret2 then
                        break
                    end

                    local c_utf8 = {0, 0, 0, 0, 0}
                    ImStd.ImTextCharToUtf8(c_utf8, c)
                    local out_len = ImStd.ImStrlen(c_utf8)
                    clipboard_filtered:resize(clipboard_filtered.Size + out_len)
                    ImStd.memmove(clipboard_filtered.Data, clipboard_filtered.Size - out_len, c_utf8, 1, out_len)

                    until true
                end
                if clipboard_filtered.Size > 0 then
                    clipboard_filtered:push_back(0)
                    stbte.paste(state, state.Stb, clipboard_filtered.Data, clipboard_filtered.Size - 1)
                    state.CursorFollow = true
                end
            end
        end

        render_selection = render_selection or (state:HasSelection() and (RENDER_SELECTION_WHEN_INACTIVE or render_cursor))
    end

    -- Process revert and user callbacks
    local apply_new_text = nil
    local apply_new_text_length = 0
    if g.ActiveId == id then
        IM_ASSERT(state ~= nil)
        --- @cast state ImGuiInputTextState

        if revert_edit and not is_readonly then
            if bit32.band(flags, ImGuiInputTextFlags.EscapeClearsAll) ~= 0 then
                IM_ASSERT(state.TextA.Data[1] ~= 0)
                apply_new_text = {0}
                apply_new_text_length = 0
                value_changed = true
                local empty_string = {0}
                ImStb.stb_textedit_replace(state, state.Stb, empty_string, 0)
            elseif ImStd.strcmp(state.TextA.Data, state.TextToRevertTo.Data) ~= 0 then
                apply_new_text = state.TextToRevertTo.Data
                apply_new_text_length = state.TextToRevertTo.Size - 1

                value_changed = true
                ImStb.stb_textedit_replace(state, state.Stb, state.TextToRevertTo.Data, state.TextToRevertTo.Size - 1)
            end
        end

        if bit32.band(flags, bit32.bor(ImGuiInputTextFlags.CallbackCompletion, ImGuiInputTextFlags.CallbackHistory, ImGuiInputTextFlags.CallbackEdit, ImGuiInputTextFlags.CallbackAlways)) ~= 0 then
            IM_ASSERT(callback ~= nil)

            local event_flag = 0
            local event_key = ImGuiKey.None
            if bit32.band(flags, ImGuiInputTextFlags.CallbackCompletion) ~= 0 and ImGui.Shortcut(ImGuiKey.Tab, 0, id) then
                event_flag = ImGuiInputTextFlags.CallbackCompletion
                event_key = ImGuiKey.Tab
            elseif bit32.band(flags, ImGuiInputTextFlags.CallbackHistory) ~= 0 and ImGui.IsKeyPressed(ImGuiKey.UpArrow) then
                event_flag = ImGuiInputTextFlags.CallbackHistory
                event_key = ImGuiKey.UpArrow
            elseif bit32.band(flags, ImGuiInputTextFlags.CallbackHistory) ~= 0 and ImGui.IsKeyPressed(ImGuiKey.DownArrow) then
                event_flag = ImGuiInputTextFlags.CallbackHistory
                event_key = ImGuiKey.DownArrow
            elseif bit32.band(flags, ImGuiInputTextFlags.CallbackEdit) ~= 0 and state.EditedThisFrame then
                event_flag = ImGuiInputTextFlags.CallbackEdit
            elseif bit32.band(flags, ImGuiInputTextFlags.CallbackAlways) ~= 0 then
                event_flag = ImGuiInputTextFlags.CallbackAlways
            end

            if event_flag ~= 0 then
                local callback_data = ImGuiInputTextCallbackData()
                callback_data.Ctx = g
                callback_data.ID = id
                callback_data.Flags = flags
                callback_data.EventFlag = event_flag
                callback_data.EventActivated = (g.ActiveId == state.ID and g.ActiveIdIsJustActivated)
                callback_data.UserData = callback_user_data

                local callback_buf = is_readonly and buf or state.TextA.Data
                IM_ASSERT(callback_buf == state.TextSrc)
                state.CallbackTextBackup:resize(state.TextLen + 1)
                ImStd.memmove(state.CallbackTextBackup.Data, 1, callback_buf, 1, state.TextLen + 1)

                callback_data.EventKey = event_key
                callback_data.Buf = callback_buf
                callback_data.BufTextLen = state.TextLen
                callback_data.BufSize = state.BufCapacity
                callback_data.BufDirty = false
                callback_data.CursorPos = state.Stb.cursor
                callback_data.SelectionStart = state.Stb.select_start
                callback_data.SelectionEnd = state.Stb.select_end

                callback(callback_data)

                callback_buf = is_readonly and buf or state.TextA.Data
                IM_ASSERT(callback_data.Buf == callback_buf)
                IM_ASSERT(callback_data.BufSize == state.BufCapacity)
                IM_ASSERT(callback_data.Flags == flags)
                if callback_data.BufDirty or callback_data.CursorPos ~= state.Stb.cursor then
                    state.CursorFollow = true
                end
                state.Stb.cursor = ImClamp(callback_data.CursorPos, 0, callback_data.BufTextLen)
                state.Stb.select_start = ImClamp(callback_data.SelectionStart, 0, callback_data.BufTextLen)
                state.Stb.select_end = ImClamp(callback_data.SelectionEnd, 0, callback_data.BufTextLen)
                if callback_data.BufDirty then
                    IM_ASSERT(callback_data.BufTextLen == ImStd.ImStrlen(callback_data.Buf))
                    InputTextReconcileUndoState(state, state.CallbackTextBackup.Data, state.CallbackTextBackup.Size - 1, callback_data.Buf, callback_data.BufTextLen)
                    state.TextLen = callback_data.BufTextLen
                    state.EditedBefore = true; state.EditedThisFrame = true
                    state:CursorAnimReset()
                end
            end
        end

        if not is_readonly then
            if bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.LiveEditOnInputScalar) ~= 0 then
                -- Apply when modified
                if (ImStd.strcmp(state.TextSrc, buf) ~= 0) then
                    apply_new_text = state.TextSrc
                    apply_new_text_length = state.TextLen
                    value_changed = true
                end
            else
                -- Apply on validation/deactivation, otherwise cancel out previous apply attempts (e.g. revert)
                value_changed = ((validated or clear_active_id or revert_edit) and ImStd.strcmp(state.TextSrc, buf) ~= 0)
                apply_new_text = value_changed and state.TextSrc or NULL
                apply_new_text_length = value_changed and state.TextLen or 0
            end
        end
    end

    if g.InputTextDeactivatedState.ID == id then
        -- The state only exists after an Edit. IsItemDeactivatedAfterEdit() is not valid in every code path (see "widgets_inputtext_status_noliveedit" test).
        if ((g.ActiveId ~= id and ImGui.IsItemDeactivated()) or (g.ActiveId == id and bit32.band(flags, ImGuiInputTextFlags.TempInput) ~= 0)) then
            if (not is_readonly and ImStd.strcmp(g.InputTextDeactivatedState.TextA.Data, buf) ~= 0) then
                apply_new_text = g.InputTextDeactivatedState.TextA.Data
                apply_new_text_length = g.InputTextDeactivatedState.TextA.Size - 1
                value_changed = true
                -- IMGUI_DEBUG_LOG("InputText(): apply Deactivated data for 0x%08X: \"%.*s\".\n", id, apply_new_text_length, apply_new_text);
            end
        end
        g.InputTextDeactivatedState.ID = 0
    end

    if apply_new_text ~= nil then
        IM_ASSERT(apply_new_text_length >= 0)
        if is_resizable then
            local callback_data = ImGuiInputTextCallbackData()
            callback_data.Ctx = g
            callback_data.ID = id
            callback_data.Flags = flags
            callback_data.EventFlag = ImGuiInputTextFlags.CallbackResize
            callback_data.EventActivated = (g.ActiveId == state.ID and g.ActiveIdIsJustActivated)
            callback_data.Buf = buf
            callback_data.BufTextLen = apply_new_text_length
            callback_data.BufSize = ImMax(buf_size, apply_new_text_length + 1)
            callback_data.UserData = callback_user_data

            callback(callback_data)

            buf = callback_data.Buf
            buf_size = callback_data.BufSize
            apply_new_text_length = ImMin(callback_data.BufTextLen, buf_size - 1)
            IM_ASSERT(apply_new_text_length <= buf_size)
        end

        ImStd.ImStrncpy(buf, 1, apply_new_text, 1, ImMin(apply_new_text_length + 1, buf_size))
    end

    -- Release active ID at the end of the function (so e.g. pressing Return still does a final application of the value)
    -- Otherwise request text input ahead for next frame.
    if g.ActiveId == id and clear_active_id then
        state.ID = 0
        ImGui.ClearActiveID()
        state.ID = id
    end

    -- Render frame
    if not is_multiline then
        ImGui.RenderNavCursor(frame_bb, id)
        ImGui.RenderFrame(frame_bb.Min, frame_bb.Max, ImGui.GetColorU32(ImGuiCol.FrameBg), true, style.FrameRounding)
    end

    local draw_pos = ImVec2()
    ImVec2_Copy(draw_pos, is_multiline and draw_window.DC.CursorPos or (frame_bb.Min + style.FramePadding))
    local clip_rect = ImRect(frame_bb.Min.x, frame_bb.Min.y, frame_bb.Min.x + inner_size.x, frame_bb.Min.y + inner_size.y) -- Not using frame_bb.Max because we have adjusted size
    if is_multiline then
        clip_rect:ClipWith(draw_window.ClipRect)
    end

    -- Set upper limit of single-line InputTextEx() at 2 million characters strings. The current pathological worst case is a long line
    -- without any carriage return, which would makes ImFont::RenderText() reserve too many vertices and probably crash. Avoid it altogether.
    -- Note that we only use this limit on single-line InputText(), so a pathologically large line on a InputTextMultiline() would still crash.
    local buf_display_max_length = 2 * 1024 * 1024
    local buf_display = buf_display_from_state and state.TextA.Data or buf
    local buf_display_end = nil -- We have specialized paths below for setting the length

    -- Display hint when contents is empty
    -- At this point we need to handle the possibility that a callback could have modified the underlying buffer (#8368)
    local new_is_displaying_hint = (hint ~= nil and (buf_display_from_state and state.TextA.Data or buf)[1] == 0)
    if new_is_displaying_hint ~= is_displaying_hint then
        if is_password and not is_displaying_hint then
            ImGui.PopPasswordFont()
        end
        is_displaying_hint = new_is_displaying_hint
        if is_password and not is_displaying_hint then
            ImGui.PushPasswordFont()
        end
    end
    if is_displaying_hint then
        --- @cast hint char[]
        buf_display = hint
        buf_display_end = ImStd.ImStrlen(hint) + 1
    else
        if render_cursor or render_selection or g.ActiveId == id then
            buf_display_end = state.TextLen + 1
        elseif is_multiline and not is_wordwrap then
            buf_display_end = nil -- Inactive multi-line: end of buffer will be output by InputTextLineIndexBuild() special strchr() path
        else
            buf_display_end = ImStd.ImStrlen(buf_display) + 1
        end
    end

    -- Calculate visibility
    local line_visible_n0, line_visible_n1 = 1, 2
    if is_multiline then
        line_visible_n0, line_visible_n1 = ImGui.CalcClipRectVisibleItemsY(clip_rect, draw_pos, g.FontSize)
    end

    local line_index = g.InputTextLineIndex
    line_index.Offsets:resize(0)
    local line_count = 1
    if is_multiline then
        local will_scroll_y = state and ((state.CursorFollow and render_cursor) or (state.CursorCenterY and (render_cursor or render_selection)))
        --- @cast buf_display_end int
        local out_buf_end
        line_count, out_buf_end = InputTextLineIndexBuild(flags, line_index, buf_display, buf_display_end, wrap_width, will_scroll_y and INT_MAX or (line_visible_n1 + 1))
        if buf_display_end then
            buf_display_end = out_buf_end
        end
    end
    line_index.EndOffset = buf_display_end - 1
    line_visible_n1 = ImMin(line_visible_n1, line_count + 1)

    local text_size_y = line_count * g.FontSize

    --- @cast buf_display_end int
    local cursor_offset = (render_cursor and state) and InputTextLineIndexGetPosOffset(g, state, line_index, buf_display, buf_display_end, state.Stb.cursor) or ImVec2(0.0, 0.0)
    local draw_scroll = ImVec2()

    local text_col = ImGui.GetColorU32(is_displaying_hint and ImGuiCol.TextDisabled or ImGuiCol.Text)
    if render_cursor or render_selection then
        IM_ASSERT(state ~= nil)
        state.LineCount = line_count

        local new_scroll_y = scroll_y
        if render_cursor and state.CursorFollow then
            if bit32.band(flags, ImGuiInputTextFlags.NoHorizontalScroll) == 0 then
                local scroll_increment_x = inner_size.x * 0.25
                local visible_width = inner_size.x - style.FramePadding.x
                if cursor_offset.x < state.Scroll.x then
                    state.Scroll.x = IM_TRUNC(ImMax(0.0, cursor_offset.x - scroll_increment_x))
                elseif cursor_offset.x - visible_width >= state.Scroll.x then
                    state.Scroll.x = IM_TRUNC(cursor_offset.x - visible_width + scroll_increment_x)
                end
            else
                state.Scroll.x = 0.0
            end

            if is_multiline then
                if cursor_offset.y - g.FontSize < scroll_y then
                    new_scroll_y = ImMax(0.0, cursor_offset.y - g.FontSize)
                elseif cursor_offset.y - (inner_size.y - style.FramePadding.y * 2.0) >= scroll_y then
                    new_scroll_y = cursor_offset.y - inner_size.y + style.FramePadding.y * 2.0
                end
            end
            state.CursorFollow = false
        end
        if state.CursorCenterY then
            if is_multiline then
                new_scroll_y = cursor_offset.y - g.FontSize - (inner_size.y * 0.5 - style.FramePadding.y)
            end
            state.CursorCenterY = false
            render_cursor = false
        end
        if new_scroll_y ~= scroll_y then
            local scroll_max_y = ImMax((text_size_y + style.FramePadding.y * 2.0) - inner_size.y, 0.0)
            scroll_y = ImClamp(new_scroll_y, 0.0, scroll_max_y)
            draw_pos.y = draw_pos.y + (draw_window.Scroll.y - scroll_y)
            draw_window.Scroll.y = scroll_y
            line_visible_n0, line_visible_n1 = ImGui.CalcClipRectVisibleItemsY(clip_rect, draw_pos, g.FontSize)
            line_visible_n1 = ImMin(line_visible_n1, line_count)
        end

        draw_scroll.x = state.Scroll.x
        if render_selection then
            local bg_color = ImGui.GetColorU32(ImGuiCol.TextSelectedBg, render_cursor and 1.0 or 0.6)
            local bg_offy_up = is_multiline and 0.0 or -1.0
            local bg_offy_dn = is_multiline and 0.0 or 2.0
            local bg_eol_width = IM_TRUNC(g.FontBaked:GetCharAdvance(32) * 0.50)

            local text_selected_begin = ImMin(state.Stb.select_start, state.Stb.select_end)
            local text_selected_end = ImMax(state.Stb.select_start, state.Stb.select_end)
            for line_n = line_visible_n0, line_visible_n1 - 1 do
                repeat
                local p = line_index:get_line_begin(1, line_n)
                local p_eol = line_index:get_line_end(1, line_n)
                local p_eol_is_wrap = (p_eol < buf_display_end and buf_display[p_eol] ~= 10)
                if p_eol_is_wrap then
                    p_eol = p_eol + 1
                end
                local line_selected_begin = (text_selected_begin > p) and text_selected_begin or p
                local line_selected_end = (text_selected_end < p_eol) and text_selected_end or p_eol

                local rect_width = 0.0
                if line_selected_begin < line_selected_end then
                    rect_width = rect_width + ImGui.CalcTextSizeEx(buf_display, line_selected_begin, line_selected_end).x
                end
                if text_selected_begin <= p_eol and text_selected_end > p_eol and not p_eol_is_wrap then
                    rect_width = rect_width + bg_eol_width
                end
                if rect_width == 0.0 then
                    break
                end

                local rect = ImRect()
                rect.Min.x = draw_pos.x - draw_scroll.x + ImGui.CalcTextSizeEx(buf_display, p, line_selected_begin).x
                rect.Min.y = draw_pos.y - draw_scroll.y + (line_n - 1) * g.FontSize
                rect.Max.x = rect.Min.x + rect_width
                rect.Max.y = rect.Min.y + bg_offy_dn + g.FontSize
                rect.Min.y = rect.Min.y + bg_offy_up
                rect:ClipWith(clip_rect)
                draw_window.DrawList:AddRectFilled(rect.Min, rect.Max, bg_color)

                until true
            end
        end
    end

    if g.ActiveId ~= id and bit32.band(flags, ImGuiInputTextFlags.ElideLeft) ~= 0 and not render_cursor and not render_selection then
        draw_pos.x = ImMin(draw_pos.x, frame_bb.Max.x - ImGui.CalcTextSize(buf_display, nil).x - style.FramePadding.x)
    end

    if (is_multiline or (buf_display_end - 1) < buf_display_max_length) and bit32.band(text_col, IM_COL32_A_MASK) ~= 0 and line_visible_n0 < line_visible_n1 then
        g.Font:RenderText(draw_window.DrawList, g.FontSize,
        draw_pos - draw_scroll + ImVec2(0.0, (line_visible_n0 - 1) * g.FontSize),
        text_col, clip_rect:AsVec4(),
        buf_display,
        line_index:get_line_begin(1, line_visible_n0),
        line_index:get_line_end(1, line_visible_n1 - 1),
        wrap_width, bit32.bor(ImDrawTextFlags.WrapKeepBlanks, ImDrawTextFlags.CpuFineClip))
    end

    if render_cursor then
        state.CursorAnim = state.CursorAnim + io.DeltaTime
        local cursor_is_visible = (not g.IO.ConfigInputTextCursorBlink) or (state.CursorAnim <= 0.0) or (ImFmod(state.CursorAnim, 1.20) <= 0.80)

        local cursor_screen_pos = ImTrunc(draw_pos + cursor_offset - draw_scroll)
        local cursor_screen_rect = ImRect(cursor_screen_pos.x, cursor_screen_pos.y - g.FontSize + 0.5, cursor_screen_pos.x + 1.0, cursor_screen_pos.y - 1.5)

        if cursor_is_visible and cursor_screen_rect:Overlaps(clip_rect) then
            draw_window.DrawList:AddLineV(cursor_screen_rect.Min.x, cursor_screen_rect.Min.y, cursor_screen_rect.Max.y, ImGui.GetColorU32(ImGuiCol.InputTextCursor), style.InputTextCursorSize)
        end

        if not is_readonly and g.ActiveId == id then
            local ime_data = g.PlatformImeData
            ime_data.WantVisible = true
            ime_data.WantTextInput = true
            ImVec2_Copy(ime_data.InputPos, ImVec2(cursor_screen_pos.x - 1.0, cursor_screen_pos.y - g.FontSize))
            ime_data.InputLineHeight = g.FontSize
            ime_data.ViewportId = window.Viewport.ID
        end
    end

    if is_password and not is_displaying_hint then
        ImGui.PopPasswordFont()
    end

    if is_multiline then
        -- For focus requests to work on our multiline we need to ensure our child ItemAdd() call specifies the ImGuiItemFlags.Inputable (see #4761, #7870)...
        ImGui.Dummy(ImVec2(0.0, text_size_y + style.FramePadding.y))
        g.NextItemData.ItemFlagsSet = bit32.bor(g.NextItemData.ItemFlagsSet, ImGuiItemFlags.Inputable, ImGuiItemFlags.NoTabStop)
        ImGui.EndChild()
        item_data_backup.StatusFlags = bit32.bor(item_data_backup.StatusFlags, bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredWindow))

        -- ...and then we need to undo the group overriding last item data, which gets a bit messy as EndGroup() tries to forward scrollbar being active...
        -- FIXME: This quite messy/tricky, should attempt to get rid of the child window.
        ImGui.EndGroup()
        if g.LastItemData.ID == 0 or g.LastItemData.ID ~= ImGui.GetWindowScrollbarID(draw_window, ImGuiAxis.Y) then
            g.LastItemData.ID = id
            g.LastItemData.ItemFlags = item_data_backup.ItemFlags
            g.LastItemData.StatusFlags = item_data_backup.StatusFlags
        end
    end

    if state and is_readonly then
        state.TextSrc = nil
    end

    if label_size.x > 0.0 then
        ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y), label, 1, label_end, false)
    end

    if value_changed then
        ImGui.MarkItemEdited(id)
    end

    if bit32.band(flags, ImGuiInputTextFlags.EnterReturnsTrue) ~= 0 then
        return validated
    else
        return value_changed
    end
end

--- @param label      string
--- @param hint       char[]
--- @param buf        char[]
--- @param buf_size   size_t
--- @param flags?     ImGuiInputTextFlags
--- @param callback?  ImGuiInputTextCallback
--- @param user_data? any
function ImGui.InputTextWithHint(label, hint, buf, buf_size, flags, callback, user_data)
    if flags == nil then flags = 0 end

    IM_ASSERT(bit32.band(flags, ImGuiInputTextFlags.Multiline) == 0)
    return ImGui.InputTextEx(label, hint, buf, buf_size, ImVec2(0, 0), flags, callback, user_data)
end

----------------------------------------------------------------
-- [SECTION] COLOR EDIT / PICKER
----------------------------------------------------------------

--- @param col float[]
--- @param H   float
--- @return float
local function ColorEditRestoreH(col, H)
    local g = GImGui
    IM_ASSERT(g.ColorEditCurrentID ~= 0)
    if g.ColorEditSavedID ~= g.ColorEditCurrentID or g.ColorEditSavedColor ~= ImGui.ColorConvertFloat4ToU32(ImVec4(col[1], col[2], col[3], 0)) then
        return H
    end
    H = g.ColorEditSavedHue
    return H
end

--- @param col float[]
--- @param H float
--- @param S float
--- @param V float
--- @return float, float, float
local function ColorEditRestoreHS(col, H, S, V)
    local g = GImGui
    IM_ASSERT(g.ColorEditCurrentID ~= 0)

    if g.ColorEditSavedID ~= g.ColorEditCurrentID or g.ColorEditSavedColor ~= ImGui.ColorConvertFloat4ToU32(ImVec4(col[1], col[2], col[3], 0)) then
        return H, S, V
    end

    -- When S == 0, H is undefined.
    -- When H == 1 it wraps around to 0.
    if S == 0.0 or (H == 0.0 and g.ColorEditSavedHue == 1) then
        H = g.ColorEditSavedHue
    end

    -- When V == 0, S is undefined.
    if V == 0.0 then
        S = g.ColorEditSavedSat
    end

    return H, S, V
end

do --[[ColorEdit4]]

local ids = { "##X", "##Y", "##Z", "##W" }
local fmt_table_int = {
    {   "%3d",   "%3d",   "%3d",   "%3d" }, -- Short display
    { "R:%3d", "G:%3d", "B:%3d", "A:%3d" }, -- Long display for RGBA
    { "H:%3d", "S:%3d", "V:%3d", "A:%3d" }  -- Long display for HSVA
}
local fmt_table_float = {
    {   "%0.3f",   "%0.3f",   "%0.3f",   "%0.3f" }, -- Short display
    { "R:%0.3f", "G:%0.3f", "B:%0.3f", "A:%0.3f" }, -- Long display for RGBA
    { "H:%0.3f", "S:%0.3f", "V:%0.3f", "A:%0.3f" }  -- Long display for HSVA
}

--- @param label string
--- @param col   float[]
--- @param flags ImGuiColorEditFlags
function ImGui.ColorEdit4(label, col, flags)
    if flags == nil then flags = 0 end
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local style = g.Style
    local square_sz = ImGui.GetFrameHeight()
    local label_display_end = ImGui.FindRenderedTextEnd(label)
    local w_full = ImGui.CalcItemWidth()
    g.NextItemData:ClearFlags()

    ImGui.BeginGroup()
    ImGui.PushID(label)
    local set_current_color_edit_id = (g.ColorEditCurrentID == 0)
    if set_current_color_edit_id then
        g.ColorEditCurrentID = window.IDStack:back()
    end

    -- If we're not showing any slider there's no point in doing any HSV conversions
    local flags_untouched = flags
    if bit32.band(flags, ImGuiColorEditFlags.NoInputs) ~= 0 then
        flags = bit32.bor(bit32.band(flags, bit32.bnot(ImGuiColorEditFlags.DisplayMask_)), ImGuiColorEditFlags.DisplayRGB, ImGuiColorEditFlags.NoOptions)
    end

    -- Context menu: display and modify options (before defaults are applied)
    if bit32.band(flags, ImGuiColorEditFlags.NoOptions) == 0 then
        ImGui.ColorEditOptionsPopup(col, flags)
    end

    -- Read stored options
    if bit32.band(flags, ImGuiColorEditFlags.DisplayMask_) == 0 then
        flags = bit32.bor(flags, bit32.band(g.IO.ConfigColorEditFlags, ImGuiColorEditFlags.DisplayMask_))
    end
    if bit32.band(flags, ImGuiColorEditFlags.DataTypeMask_) == 0 then
        flags = bit32.bor(flags, bit32.band(g.IO.ConfigColorEditFlags, ImGuiColorEditFlags.DataTypeMask_))
    end
    if bit32.band(flags, ImGuiColorEditFlags.PickerMask_) == 0 then
        flags = bit32.bor(flags, bit32.band(g.IO.ConfigColorEditFlags, ImGuiColorEditFlags.PickerMask_))
    end
    if bit32.band(flags, ImGuiColorEditFlags.InputMask_) == 0 then
        flags = bit32.bor(flags, bit32.band(g.IO.ConfigColorEditFlags, ImGuiColorEditFlags.InputMask_))
    end
    flags = bit32.bor(flags, bit32.band(g.IO.ConfigColorEditFlags, bit32.bnot(bit32.bor(ImGuiColorEditFlags.DisplayMask_, ImGuiColorEditFlags.DataTypeMask_, ImGuiColorEditFlags.PickerMask_, ImGuiColorEditFlags.InputMask_))))
    IM_ASSERT(ImIsPowerOfTwo(bit32.band(flags, ImGuiColorEditFlags.DisplayMask_))) -- Check that only 1 is selected
    IM_ASSERT(ImIsPowerOfTwo(bit32.band(flags, ImGuiColorEditFlags.InputMask_)))   -- Check that only 1 is selected

    local alpha = bit32.band(flags, ImGuiColorEditFlags.NoAlpha) == 0
    local hdr = bit32.band(flags, ImGuiColorEditFlags.HDR) ~= 0
    local components = alpha and 4 or 3
    local w_button = (bit32.band(flags, ImGuiColorEditFlags.NoSmallPreview) ~= 0) and 0.0 or (square_sz + style.ItemInnerSpacing.x)
    local w_inputs = ImMax(w_full - w_button, 1.0)
    w_full = w_inputs + w_button

    -- Convert to the formats we need
    local f = { col[1], col[2], col[3], alpha and col[4] or 1.0 }
    if bit32.band(flags, ImGuiColorEditFlags.InputHSV) ~= 0 and bit32.band(flags, ImGuiColorEditFlags.DisplayRGB) ~= 0 then
        f[1], f[2], f[3] = ImGui.ColorConvertHSVtoRGB(f[1], f[2], f[3])
    elseif bit32.band(flags, ImGuiColorEditFlags.InputRGB) ~= 0 and bit32.band(flags, ImGuiColorEditFlags.DisplayHSV) ~= 0 then
        -- Hue is lost when converting from grayscale rgb (saturation=0). Restore it.
        f[1], f[2], f[3] = ImGui.ColorConvertRGBtoHSV(f[1], f[2], f[3])
        f[1], f[2], f[3] = ColorEditRestoreHS(col, f[1], f[2], f[3])
    end
    local i = { IM_F32_TO_INT8_UNBOUND(f[1]), IM_F32_TO_INT8_UNBOUND(f[2]), IM_F32_TO_INT8_UNBOUND(f[3]), IM_F32_TO_INT8_UNBOUND(f[4]) }

    local value_changed = false
    local value_changed_as_float = false

    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)
    local inputs_offset_x = (style.ColorButtonPosition == ImGuiDir.Left) and w_button or 0.0
    window.DC.CursorPos.x = pos.x + inputs_offset_x

    if bit32.band(flags, bit32.bor(ImGuiColorEditFlags.DisplayRGB, ImGuiColorEditFlags.DisplayHSV)) ~= 0 and bit32.band(flags, ImGuiColorEditFlags.NoInputs) == 0 then
        local w_items = w_inputs - style.ItemInnerSpacing.x * (components - 1)
        local w_per_component = IM_TRUNC(w_items / components)
        local draw_color_marker = bit32.band(flags, bit32.bor(ImGuiColorEditFlags.DisplayHSV, ImGuiColorEditFlags.NoColorMarkers)) == 0
        local hide_prefix = draw_color_marker or (w_per_component <= ImGui.CalcTextSize((bit32.band(flags, ImGuiColorEditFlags.Float) ~= 0) and "M:0.000" or "M:000").x)

        local fmt_idx
        if hide_prefix then
            fmt_idx = 1
        elseif bit32.band(flags, ImGuiColorEditFlags.DisplayHSV) ~= 0 then
            fmt_idx = 3
        else
            fmt_idx = 2
        end
        local drag_flags = draw_color_marker and ImGuiSliderFlags.ColorMarkers or ImGuiSliderFlags.None

        local prev_split = 0.0
        for n = 1, components do
            if n > 1 then
                ImGui.SameLine(0, style.ItemInnerSpacing.x)
            end
            local next_split = IM_TRUNC(w_items * n / components)
            ImGui.SetNextItemWidth(ImMax(next_split - prev_split, 1.0))
            prev_split = next_split
            if draw_color_marker then
                ImGui.SetNextItemColorMarker(GDefaultRgbaColorMarkers[n])
            end

            -- FIXME: When ImGuiColorEditFlags_HDR flag is passed HS values snap in weird ways when SV values go below 0
            if bit32.band(flags, ImGuiColorEditFlags.Float) ~= 0 then
                local changed
                f[n], changed = ImGui.DragFloat(ids[n], f[n], 1.0 / 255.0, 0.0, hdr and 0.0 or 1.0, fmt_table_float[fmt_idx][n], drag_flags)
                value_changed = value_changed or changed
                value_changed_as_float = value_changed_as_float or value_changed
            else
                local changed
                i[n], changed = ImGui.DragInt(ids[n], i[n], 1.0, 0, hdr and 0 or 255, fmt_table_int[fmt_idx][n], drag_flags)
                value_changed = value_changed or changed
            end

            if bit32.band(flags, ImGuiColorEditFlags.NoOptions) == 0 then
                ImGui.OpenPopupOnItemClick("context", ImGuiPopupFlags.MouseButtonRight)
            end
        end
    elseif bit32.band(flags, ImGuiColorEditFlags.DisplayHex) ~= 0 and bit32.band(flags, ImGuiColorEditFlags.NoInputs) == 0 then
        -- RGB Hexadecimal Input
        -- TODO: resolve sprintf, sscanf requirement. currently this section creates a lot of temp tables and strings...
        local buf, buf_size = nil, 64
        if alpha then
            local str = ImFormatString("#%02X%02X%02X%02X", ImClamp(i[1], 0, 255), ImClamp(i[2], 0, 255), ImClamp(i[3], 0, 255), ImClamp(i[4], 0, 255))
            buf = { string.byte(str, 1, #str) }
            buf[#buf + 1] = 0
        else
            local str = ImFormatString("#%02X%02X%02X", ImClamp(i[1], 0, 255), ImClamp(i[2], 0, 255), ImClamp(i[3], 0, 255))
            buf = { string.byte(str, 1, #str) }
            buf[#buf + 1] = 0
        end
        ImGui.SetNextItemWidth(w_inputs)

        if ImGui.InputText("##Text", buf, buf_size, ImGuiInputTextFlags.CharsUppercase) then
            value_changed = true
            local p = 1
            while buf[p] == 35 or ImCharIsBlankA(buf[p]) do
                p = p + 1
            end
            i[1], i[2], i[3] = 0, 0, 0
            i[4] = 0xFF

            local r
            if alpha then
                r = ImStd.sscanf(buf, p, "%02X%02X%02X%02X", i)
            else
                r = ImStd.sscanf(buf, p, "%02X%02X%02X", i)
            end
            -- IM_UNUSED(r)
        end

        if bit32.band(flags, ImGuiColorEditFlags.NoOptions) == 0 then
            ImGui.OpenPopupOnItemClick("context", ImGuiPopupFlags.MouseButtonRight)
        end
    end

    local picker_active_window = nil
    if bit32.band(flags, ImGuiColorEditFlags.NoSmallPreview) == 0 then
        local button_offset_x = (bit32.band(flags, ImGuiColorEditFlags.NoInputs) ~= 0 or style.ColorButtonPosition == ImGuiDir.Left) and 0.0 or (w_inputs + style.ItemInnerSpacing.x)
        ImVec2_Copy(window.DC.CursorPos, ImVec2(pos.x + button_offset_x, pos.y))

        local col_v4 = ImVec4(col[1], col[2], col[3], alpha and col[4] or 1.0)
        if ImGui.ColorButton("##ColorButton", col_v4, flags) then
            if bit32.band(flags, ImGuiColorEditFlags.NoPicker) == 0 then
                -- Store current color and open a picker
                ImVec4_Copy(g.ColorPickerRef, col_v4)
                ImGui.OpenPopup("picker")
                ImGui.SetNextWindowPos(g.LastItemData.Rect:GetBL() + ImVec2(0.0, style.ItemSpacing.y))
            end
        end
        if bit32.band(flags, ImGuiColorEditFlags.NoOptions) == 0 then
            ImGui.OpenPopupOnItemClick("context", ImGuiPopupFlags.MouseButtonRight)
        end

        if ImGui.BeginPopup("picker") then
            if g.CurrentWindow.BeginCount == 1 then
                picker_active_window = g.CurrentWindow
                if label ~= "" and label_display_end > 1 then
                    ImGui.TextEx(label, label_display_end)
                    ImGui.Spacing()
                end
                local picker_flags_to_forward = bit32.bor(ImGuiColorEditFlags.DataTypeMask_, ImGuiColorEditFlags.PickerMask_, ImGuiColorEditFlags.InputMask_, ImGuiColorEditFlags.HDR, ImGuiColorEditFlags.NoAlpha, ImGuiColorEditFlags.AlphaBar)
                local picker_flags = bit32.bor(bit32.band(flags_untouched, picker_flags_to_forward), ImGuiColorEditFlags.DisplayMask_, ImGuiColorEditFlags.NoLabel, ImGuiColorEditFlags.AlphaPreviewHalf)
                ImGui.SetNextItemWidth(square_sz * 12.0) -- Use 256 + bar sizes?
                value_changed = value_changed or ImGui.ColorPicker4("##picker", col, picker_flags, g.ColorPickerRef)
            end
            ImGui.EndPopup()
        end
    end

    if label ~= "" and label_display_end > 1 and bit32.band(flags, ImGuiColorEditFlags.NoLabel) == 0 then
        -- Position not necessarily next to last submitted button (e.g. if style.ColorButtonPosition == ImGuiDir_Left),
        -- but we need to use SameLine() to setup baseline correctly. Might want to refactor SameLine() to simplify this
        ImGui.SameLine(0.0, style.ItemInnerSpacing.x)
        window.DC.CursorPos.x = pos.x + ((bit32.band(flags, ImGuiColorEditFlags.NoInputs) ~= 0) and w_button or (w_full + style.ItemInnerSpacing.x))
        ImGui.TextEx(label, label_display_end)
    end

    -- Convert back
    if value_changed and picker_active_window == nil then
        if not value_changed_as_float then
            for n = 1, 4 do
                f[n] = i[n] / 255.0
            end
        end
        if bit32.band(flags, ImGuiColorEditFlags.DisplayHSV) ~= 0 and bit32.band(flags, ImGuiColorEditFlags.InputRGB) ~= 0 then
            g.ColorEditSavedHue = f[1]
            g.ColorEditSavedSat = f[2]
            f[1], f[2], f[3] = ImGui.ColorConvertHSVtoRGB(f[1], f[2], f[3])
            g.ColorEditSavedID = g.ColorEditCurrentID
            g.ColorEditSavedColor = ImGui.ColorConvertFloat4ToU32(ImVec4(f[1], f[2], f[3], 0))
        end
        if bit32.band(flags, ImGuiColorEditFlags.DisplayRGB) ~= 0 and bit32.band(flags, ImGuiColorEditFlags.InputHSV) ~= 0 then
            f[1], f[2], f[3] = ImGui.ColorConvertRGBtoHSV(f[1], f[2], f[3])
        end

        col[1] = f[1]
        col[2] = f[2]
        col[3] = f[3]
        if alpha then
            col[4] = f[4]
        end
    end

    if set_current_color_edit_id then
        g.ColorEditCurrentID = 0
    end
    ImGui.PopID()
    ImGui.EndGroup()

    -- Drag and Drop Target
    -- TODO:

    -- When picker is being actively used, use its active id so IsItemActive() will function on ColorEdit4()
    if picker_active_window and g.ActiveId ~= 0 and g.ActiveIdWindow == picker_active_window then
        g.LastItemData.ID = g.ActiveId
    end

    if value_changed and g.LastItemData.ID ~= 0 then -- In case of ID collision, the second EndGroup() won't catch g.ActiveId
        ImGui.MarkItemEdited(g.LastItemData.ID)
    end

    return value_changed
end

end

--- @param label  string
--- @param col    [float, float, float]
--- @param flags? ImGuiColorEditFlags
function ImGui.ColorEdit3(label, col, flags)
    if flags == nil then flags = 0 end
    if flags == nil then flags = 0 end

    return ImGui.ColorEdit4(label, col, bit32.bor(flags, ImGuiColorEditFlags.NoAlpha))
end

-- `col` mutated in place, returns value_changed
function ImGui.ColorPicker3(label, col, flags)
    if flags == nil then flags = 0 end
    local col4 = { col[1], col[2], col[3], 1.0 }
    if not ImGui.ColorPicker4(label, col4, bit32.bor(flags or 0, ImGuiColorEditFlags.NoAlpha)) then
        return false
    end
    col[1] = col4[1]; col[2] = col4[2]; col[3] = col4[3]
    return true
end

function ImGui.SetColorEditOptions(flags)
    local g = GImGui
    local def = ImGuiColorEditFlags.DefaultOptions_
    for _, mask in ipairs({ ImGuiColorEditFlags.DisplayMask_, ImGuiColorEditFlags.DataTypeMask_, ImGuiColorEditFlags.PickerMask_, ImGuiColorEditFlags.InputMask_ }) do
        if bit32.band(flags, mask) == 0 then
            flags = bit32.bor(flags, bit32.band(def, mask))
        end
    end
    g.IO.ConfigColorEditFlags = flags
end

-- Helper for ColorPicker4()
--- @param draw_list ImDrawList
--- @param pos       ImVec2
--- @param half_sz   ImVec2
--- @param bar_w     float
--- @param alpha     float
local function RenderArrowsForVerticalBar(draw_list, pos, half_sz, bar_w, alpha)
    local alpha8 = IM_F32_TO_INT8_SAT(alpha)
    ImGui.RenderArrowPointingAt(draw_list, ImVec2(pos.x + half_sz.x + 1,         pos.y), ImVec2(half_sz.x + 2, half_sz.y + 1), ImGuiDir.Right, IM_COL32(0, 0, 0, alpha8))
    ImGui.RenderArrowPointingAt(draw_list, ImVec2(pos.x + half_sz.x,             pos.y), half_sz,                              ImGuiDir.Right, IM_COL32(255, 255, 255, alpha8))
    ImGui.RenderArrowPointingAt(draw_list, ImVec2(pos.x + bar_w - half_sz.x - 1, pos.y), ImVec2(half_sz.x + 2, half_sz.y + 1), ImGuiDir.Left,  IM_COL32(0, 0, 0, alpha8))
    ImGui.RenderArrowPointingAt(draw_list, ImVec2(pos.x + bar_w - half_sz.x,     pos.y), half_sz,                              ImGuiDir.Left,  IM_COL32(255, 255, 255, alpha8))
end

do --[[ColorPicker4]]

local backup_initial_col = {0, 0, 0, 0}

--- @param label    string
--- @param col      float[]
--- @param flags    ImGuiColorEditFlags
--- @param ref_col? float[]
function ImGui.ColorPicker4(label, col, flags, ref_col)
    if flags == nil then flags = 0 end
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local draw_list = window.DrawList
    local g = GImGui
    local style = g.Style
    local io = g.IO

    local width = ImGui.CalcItemWidth()
    local is_readonly = bit32.band(bit32.bor(g.NextItemData.ItemFlagsSet, g.CurrentItemFlags), ImGuiItemFlags.ReadOnly) ~= 0
    g.NextItemData:ClearFlags()

    ImGui.PushID(label)
    local set_current_color_edit_id = (g.ColorEditCurrentID == 0)
    if set_current_color_edit_id then
        g.ColorEditCurrentID = window.IDStack:back()
    end
    ImGui.BeginGroup()

    if bit32.band(flags, ImGuiColorEditFlags.NoSidePreview) == 0 then
        flags = bit32.bor(flags, ImGuiColorEditFlags.NoSmallPreview)
    end

    -- Context menu: display and store options.
    if bit32.band(flags, ImGuiColorEditFlags.NoOptions) == 0 then
        ImGui.ColorPickerOptionsPopup(col, flags)
    end

    -- Read stored options
    if bit32.band(flags, ImGuiColorEditFlags.PickerMask_) == 0 then
        local picker_flags = bit32.band(g.IO.ConfigColorEditFlags, ImGuiColorEditFlags.PickerMask_)
        if picker_flags ~= 0 then
            flags = bit32.bor(flags, picker_flags)
        else
            flags = bit32.bor(flags, bit32.band(ImGuiColorEditFlags.DefaultOptions_, ImGuiColorEditFlags.PickerMask_))
        end
    end
    if bit32.band(flags, ImGuiColorEditFlags.InputMask_) == 0 then
        local input_flags = bit32.band(g.IO.ConfigColorEditFlags, ImGuiColorEditFlags.InputMask_)
        if input_flags ~= 0 then
            flags = bit32.bor(flags, input_flags)
        else
            flags = bit32.bor(flags, bit32.band(ImGuiColorEditFlags.DefaultOptions_, ImGuiColorEditFlags.InputMask_))
        end
    end
    IM_ASSERT(ImIsPowerOfTwo(bit32.band(flags, ImGuiColorEditFlags.PickerMask_))) -- Check that only 1 is selected
    IM_ASSERT(ImIsPowerOfTwo(bit32.band(flags, ImGuiColorEditFlags.InputMask_)))  -- Check that only 1 is selected
    if bit32.band(flags, ImGuiColorEditFlags.NoOptions) == 0 then
        flags = bit32.bor(flags, bit32.band(g.IO.ConfigColorEditFlags, ImGuiColorEditFlags.AlphaBar))
    end

    -- Setup
    local components = (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0) and 3 or 4
    local alpha_bar = (bit32.band(flags, ImGuiColorEditFlags.AlphaBar) ~= 0) and (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) == 0)
    local picker_pos = ImVec2()
    ImVec2_Copy(picker_pos, window.DC.CursorPos)
    local square_sz = ImGui.GetFrameHeight()
    local bars_width = square_sz  -- Arbitrary smallish width of Hue/Alpha picking bars
    local sv_picker_size = ImMax(bars_width * 1, width - (alpha_bar and 2 or 1) * (bars_width + style.ItemInnerSpacing.x))  -- Saturation/Value picking box
    local bar0_pos_x = picker_pos.x + sv_picker_size + style.ItemInnerSpacing.x
    local bar1_pos_x = bar0_pos_x + bars_width + style.ItemInnerSpacing.x
    local bars_triangles_half_sz = IM_TRUNC(bars_width * 0.20)

    backup_initial_col[1], backup_initial_col[2], backup_initial_col[3], backup_initial_col[4] = col[1], col[2], col[3], col[4]

    local wheel_thickness = sv_picker_size * 0.08
    local wheel_r_outer = sv_picker_size * 0.50
    local wheel_r_inner = wheel_r_outer - wheel_thickness
    local wheel_center = ImVec2(picker_pos.x + (sv_picker_size + bars_width) * 0.5, picker_pos.y + sv_picker_size * 0.5)

    -- Note: the triangle is displayed rotated with triangle_pa pointing to Hue, but most coordinates stays unrotated for logic.
    local triangle_rotate = bit32.band(flags, ImGuiColorEditFlags.PickerNoRotate) == 0
    local triangle_r = wheel_r_inner - math.floor(sv_picker_size * 0.027)
    local triangle_pa, triangle_pb, triangle_pc
    if triangle_rotate then triangle_pa = ImVec2(       triangle_r,                 0.0) else triangle_pa = ImVec2( triangle_r * 0.866, triangle_r * 0.5) end -- Hue point
    if triangle_rotate then triangle_pb = ImVec2(triangle_r * -0.5, triangle_r * -0.866) else triangle_pb = ImVec2(                0.0,      -triangle_r) end -- Black point
    if triangle_rotate then triangle_pc = ImVec2(triangle_r * -0.5, triangle_r *  0.866) else triangle_pc = ImVec2(triangle_r * -0.866, triangle_r * 0.5) end -- White point

    local H = col[1]; local S = col[2]; local V = col[3]
    local R = col[1]; local G = col[2]; local B = col[3]
    if bit32.band(flags, ImGuiColorEditFlags.InputRGB) ~= 0 then
        -- Hue is lost when converting from grayscale rgb (saturation=0). Restore it.
        H, S, V = ImGui.ColorConvertRGBtoHSV(R, G, B)
        H, S, V = ColorEditRestoreHS(col, H, S, V)
    elseif bit32.band(flags, ImGuiColorEditFlags.InputHSV) ~= 0 then
        R, G, B = ImGui.ColorConvertHSVtoRGB(H, S, V)
    end

    local value_changed = false; local value_changed_h = false; local value_changed_sv = false

    ImGui.PushItemFlag(ImGuiItemFlags.NoNav, true)
    if bit32.band(flags, ImGuiColorEditFlags.PickerHueWheel) ~= 0 then
        -- Hue wheel + SV triangle logic
        ImGui.InvisibleButton("hsv", ImVec2(sv_picker_size + style.ItemInnerSpacing.x + bars_width, sv_picker_size))
        if ImGui.IsItemActive() and not is_readonly then
            local initial_off = g.IO.MouseClickedPos[0] - wheel_center
            local current_off = g.IO.MousePos - wheel_center
            local initial_dist2 = ImLengthSqr(initial_off)

            if initial_dist2 >= (wheel_r_inner - 1) * (wheel_r_inner - 1) and initial_dist2 <= (wheel_r_outer + 1) * (wheel_r_outer + 1) then
                -- Interactive with Hue wheel
                H = ImAtan2(current_off.y, current_off.x) / IM_PI * 0.5
                if H < 0.0 then
                    H = H + 1.0
                end
                value_changed = true
                value_changed_h = true
            end

            local cos_hue_angle = triangle_rotate and ImCos(-H * 2.0 * IM_PI) or 1.0
            local sin_hue_angle = triangle_rotate and ImSin(-H * 2.0 * IM_PI) or 0.0

            if ImStd.ImTriangleContainsPoint(triangle_pa, triangle_pb, triangle_pc, ImRotate(initial_off, cos_hue_angle, sin_hue_angle)) then
                -- Interacting with SV triangle
                local current_off_unrotated = ImRotate(current_off, cos_hue_angle, sin_hue_angle)
                if not ImStd.ImTriangleContainsPoint(triangle_pa, triangle_pb, triangle_pc, current_off_unrotated) then
                    current_off_unrotated = ImStd.ImTriangleClosestPoint(triangle_pa, triangle_pb, triangle_pc, current_off_unrotated)
                end
                local uu, vv, ww
                uu, vv, ww = ImStd.ImTriangleBarycentricCoords(triangle_pa, triangle_pb, triangle_pc, current_off_unrotated)
                V = ImClamp(1.0 - vv, 0.0001, 1.0)
                S = ImClamp(uu / V, 0.0001, 1.0)
                value_changed = true
                value_changed_sv = true
            end
        end

        if bit32.band(flags, ImGuiColorEditFlags.NoOptions) == 0 then
            ImGui.OpenPopupOnItemClick("context", ImGuiPopupFlags.MouseButtonRight)
        end
    elseif bit32.band(flags, ImGuiColorEditFlags.PickerHueBar) ~= 0 then
        -- SV rectangle logic
        ImGui.InvisibleButton("sv", ImVec2(sv_picker_size, sv_picker_size))
        if ImGui.IsItemActive() and not is_readonly then
            S = ImSaturate((io.MousePos.x - picker_pos.x) / ImMax(sv_picker_size - 1, 0.0001))
            V = 1.0 - ImSaturate((io.MousePos.y - picker_pos.y) / ImMax(sv_picker_size - 1, 0.0001))
            H = ColorEditRestoreH(col, H)  -- Greatly reduces hue jitter and reset to 0 when hue == 255 and color is rapidly modified using SV square.
            value_changed = true
            value_changed_sv = true
        end

        if bit32.band(flags, ImGuiColorEditFlags.NoOptions) == 0 then
            ImGui.OpenPopupOnItemClick("context", ImGuiPopupFlags.MouseButtonRight)
        end

        -- Hue bar logic
        ImGui.SetCursorScreenPos(ImVec2(bar0_pos_x, picker_pos.y))
        ImGui.InvisibleButton("hue", ImVec2(bars_width, sv_picker_size))
        if ImGui.IsItemActive() and not is_readonly then
            H = ImSaturate((io.MousePos.y - picker_pos.y) / ImMax(sv_picker_size - 1, 0.0001))
            value_changed = true
            value_changed_h = true
        end
    end

    -- Alpha bar logic
    if alpha_bar then
        ImGui.SetCursorScreenPos(ImVec2(bar1_pos_x, picker_pos.y))
        ImGui.InvisibleButton("alpha", ImVec2(bars_width, sv_picker_size))
        if ImGui.IsItemActive() then
            col[4] = 1.0 - ImSaturate((io.MousePos.y - picker_pos.y) / ImMax(sv_picker_size - 1, 0.0001))
            value_changed = true
        end
    end
    ImGui.PopItemFlag()

    if bit32.band(flags, ImGuiColorEditFlags.NoSidePreview) == 0 then
        ImGui.SameLine(0, style.ItemInnerSpacing.x)
        ImGui.BeginGroup()
    end

    if bit32.band(flags, ImGuiColorEditFlags.NoLabel) == 0 then
        local label_display_end = ImGui.FindRenderedTextEnd(label)
        if label ~= "" and label_display_end > 1 then
            if bit32.band(flags, ImGuiColorEditFlags.NoSidePreview) ~= 0 then
                ImGui.SameLine(0, style.ItemInnerSpacing.x)
            end
            ImGui.TextEx(label, label_display_end)
        end
    end

    if bit32.band(flags, ImGuiColorEditFlags.NoSidePreview) == 0 then
        ImGui.PushItemFlag(ImGuiItemFlags.NoNavDefaultFocus, true)
        local col_v4 = ImVec4(col[1], col[2], col[3], (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0) and 1.0 or col[4])

        if bit32.band(flags, ImGuiColorEditFlags.NoLabel) ~= 0 then
            ImGui.Text("Current")
        end

        local sub_flags_to_forward = bit32.bor(ImGuiColorEditFlags.InputMask_, ImGuiColorEditFlags.HDR, ImGuiColorEditFlags.AlphaMask_, ImGuiColorEditFlags.NoTooltip)

        ImGui.ColorButton("##current", col_v4, bit32.band(flags, sub_flags_to_forward), ImVec2(square_sz * 3, square_sz * 2))

        if ref_col ~= nil then
            ImGui.Text("Original")
            local ref_col_v4 = ImVec4(ref_col[1], ref_col[2], ref_col[3], (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0) and 1.0 or ref_col[4])
            if ImGui.ColorButton("##original", ref_col_v4, bit32.band(flags, sub_flags_to_forward), ImVec2(square_sz * 3, square_sz * 2)) then
                for i = 1, components do
                    col[i] = ref_col[i]
                end
                value_changed = true
            end
        end

        ImGui.PopItemFlag()
        ImGui.EndGroup()
    end

    -- Convert back color to RGB
    if value_changed_h or value_changed_sv then
        if bit32.band(flags, ImGuiColorEditFlags.InputRGB) ~= 0 then
            col[1], col[2], col[3] = ImGui.ColorConvertHSVtoRGB(H, S, V)  -- Lua 1-based indexing
            g.ColorEditSavedHue = H
            g.ColorEditSavedSat = S
            g.ColorEditSavedID = g.ColorEditCurrentID
            g.ColorEditSavedColor = ImGui.ColorConvertFloat4ToU32(ImVec4(col[1], col[2], col[3], 0))
        elseif bit32.band(flags, ImGuiColorEditFlags.InputHSV) ~= 0 then
            col[1] = H
            col[2] = S
            col[3] = V
        end
    end

    -- R,G,B and H,S,V slider color editor
    local value_changed_fix_hue_wrap = false
    if bit32.band(flags, ImGuiColorEditFlags.NoInputs) == 0 then
        ImGui.PushItemWidth((alpha_bar and bar1_pos_x or bar0_pos_x) + bars_width - picker_pos.x)

        local sub_flags_to_forward = bit32.bor(ImGuiColorEditFlags.DataTypeMask_, ImGuiColorEditFlags.InputMask_, ImGuiColorEditFlags.HDR, ImGuiColorEditFlags.AlphaMask_, ImGuiColorEditFlags.NoOptions, ImGuiColorEditFlags.NoTooltip, ImGuiColorEditFlags.NoSmallPreview)
        local sub_flags = bit32.bor(bit32.band(flags, sub_flags_to_forward), ImGuiColorEditFlags.NoPicker)

        if bit32.band(flags, ImGuiColorEditFlags.DisplayRGB) ~= 0 or bit32.band(flags, ImGuiColorEditFlags.DisplayMask_) == 0 then
            if ImGui.ColorEdit4("##rgb", col, bit32.bor(sub_flags, ImGuiColorEditFlags.DisplayRGB)) then
                -- FIXME: Hackily differentiating using the DragInt (ActiveId != 0 && !ActiveIdAllowOverlap) vs. using the InputText or DropTarget.
                -- For the later we don't want to run the hue-wrap canceling code. If you are well versed in HSV picker please provide your input! (See #2050)
                value_changed_fix_hue_wrap = (g.ActiveId ~= 0 and not g.ActiveIdAllowOverlap)
                value_changed = true
            end
        end

        if bit32.band(flags, ImGuiColorEditFlags.DisplayHSV) ~= 0 or bit32.band(flags, ImGuiColorEditFlags.DisplayMask_) == 0 then
            if ImGui.ColorEdit4("##hsv", col, bit32.bor(sub_flags, ImGuiColorEditFlags.DisplayHSV)) then
                value_changed = true
            end
        end

        if bit32.band(flags, ImGuiColorEditFlags.DisplayHex) ~= 0 or bit32.band(flags, ImGuiColorEditFlags.DisplayMask_) == 0 then
            if ImGui.ColorEdit4("##hex", col, bit32.bor(sub_flags, ImGuiColorEditFlags.DisplayHex)) then
                value_changed = true
            end
        end

        ImGui.PopItemWidth()
    end

    -- Try to cancel hue wrap (after ColorEdit4 call), if any
    if value_changed_fix_hue_wrap and bit32.band(flags, ImGuiColorEditFlags.InputRGB) ~= 0 then
        local new_H, new_S, new_V = ImGui.ColorConvertRGBtoHSV(col[1], col[2], col[3])  -- Lua 1-based indexing

        if new_H <= 0 and H > 0 then
            if new_V <= 0 and V ~= new_V then
                col[1], col[2], col[3] = ImGui.ColorConvertHSVtoRGB(H, S, (new_V <= 0) and (V * 0.5) or new_V)
            elseif new_S <= 0 then
                col[1], col[2], col[3] = ImGui.ColorConvertHSVtoRGB(H, (new_S <= 0) and (S * 0.5) or new_S, new_V)
            end
        end
    end

    if value_changed then
        if bit32.band(flags, ImGuiColorEditFlags.InputRGB) ~= 0 then
            R = col[1]
            G = col[2]
            B = col[3]
            H, S, V = ImGui.ColorConvertRGBtoHSV(R, G, B)
            H, S, V = ColorEditRestoreHS(col, H, S, V) -- Fix local Hue as display below will use it immediately.
        elseif bit32.band(flags, ImGuiColorEditFlags.InputHSV) ~= 0 then
            H = col[1]
            S = col[2]
            V = col[3]
            R, G, B = ImGui.ColorConvertHSVtoRGB(H, S, V)
        end
    end

    local style_alpha8 = IM_F32_TO_INT8_SAT(style.Alpha)
    local col_black = IM_COL32(0, 0, 0, style_alpha8)
    local col_white = IM_COL32(255, 255, 255, style_alpha8)
    local col_midgrey = IM_COL32(128, 128, 128, style_alpha8)
    local col_hues = { IM_COL32(255, 0, 0, style_alpha8), IM_COL32(255, 255, 0, style_alpha8), IM_COL32(0, 255, 0, style_alpha8), IM_COL32(0, 255, 255, style_alpha8), IM_COL32(0, 0, 255, style_alpha8), IM_COL32(255, 0, 255, style_alpha8), IM_COL32(255, 0, 0, style_alpha8) }

    local hue_color_f = ImVec4(1, 1, 1, style.Alpha)
    hue_color_f.x, hue_color_f.y, hue_color_f.z = ImGui.ColorConvertHSVtoRGB(H, 1, 1)
    local hue_color32 = ImGui.ColorConvertFloat4ToU32(hue_color_f)
    local user_col32_striped_of_alpha = ImGui.ColorConvertFloat4ToU32(ImVec4(R, G, B, style.Alpha)) -- Important: this is still including the main rendering/style alpha!!

    local sv_cursor_pos = ImVec2()

    if bit32.band(flags, ImGuiColorEditFlags.PickerHueWheel) ~= 0 then
        -- Render Hue Wheel
        local aeps = 0.5 / wheel_r_outer -- Half a pixel arc length in radians (2pi cancels out).
        local segment_per_arc = ImMax(4, math.floor(wheel_r_outer / 12))

        for n = 1, 6 do
            local a0 = (n - 1) / 6.0 * 2.0 * IM_PI - aeps
            local a1 = n / 6.0 * 2.0 * IM_PI + aeps
            local vert_start_idx = draw_list.VtxBuffer.Size + 1

            draw_list:PathArcTo(wheel_center, (wheel_r_inner + wheel_r_outer) * 0.5, a0, a1, segment_per_arc)
            draw_list:PathStroke(col_white, wheel_thickness)

            local vert_end_idx = draw_list.VtxBuffer.Size + 1

            -- Paint colors over existing vertices
            local gradient_p0 = ImVec2(wheel_center.x + ImCos(a0) * wheel_r_inner, wheel_center.y + ImSin(a0) * wheel_r_inner)
            local gradient_p1 = ImVec2(wheel_center.x + ImCos(a1) * wheel_r_inner, wheel_center.y + ImSin(a1) * wheel_r_inner)
            ImGui.ShadeVertsLinearColorGradientKeepAlpha(draw_list, vert_start_idx, vert_end_idx, gradient_p0, gradient_p1, col_hues[n], col_hues[n + 1])
        end

        -- Render Cursor + preview on Hue Wheel
        local cos_hue_angle = ImCos(H * 2.0 * IM_PI)
        local sin_hue_angle = ImSin(H * 2.0 * IM_PI)

        local hue_cursor_pos = ImVec2(wheel_center.x + cos_hue_angle * (wheel_r_inner + wheel_r_outer) * 0.5, wheel_center.y + sin_hue_angle * (wheel_r_inner + wheel_r_outer) * 0.5)

        local hue_cursor_rad = value_changed_h and (wheel_thickness * 0.65) or (wheel_thickness * 0.55)
        local hue_cursor_segments = draw_list:_CalcCircleAutoSegmentCount(hue_cursor_rad) -- Lock segment count so the +1 one matches others.

        draw_list:AddCircleFilled(hue_cursor_pos, hue_cursor_rad, hue_color32, hue_cursor_segments)
        draw_list:AddCircle(hue_cursor_pos, hue_cursor_rad + 1, col_midgrey, hue_cursor_segments)
        draw_list:AddCircle(hue_cursor_pos, hue_cursor_rad, col_white, hue_cursor_segments)

        if triangle_rotate == false then
            cos_hue_angle = 1.0
            sin_hue_angle = 0.0
        end

        -- Render SV triangle (rotated according to hue)
        local tra = wheel_center + ImRotate(triangle_pa, cos_hue_angle, sin_hue_angle)
        local trb = wheel_center + ImRotate(triangle_pb, cos_hue_angle, sin_hue_angle)
        local trc = wheel_center + ImRotate(triangle_pc, cos_hue_angle, sin_hue_angle)

        local uv_white = ImGui.GetFontTexUvWhitePixel()
        draw_list:PrimReserve(3, 3)
        draw_list:PrimVtx(tra, uv_white, hue_color32)
        draw_list:PrimVtx(trb, uv_white, col_black)
        draw_list:PrimVtx(trc, uv_white, col_white)
        draw_list:AddTriangle(tra, trb, trc, col_midgrey, 1.5)

        sv_cursor_pos = ImLerp(ImLerp(trc, tra, ImSaturate(S)), trb, ImSaturate(1 - V))
    elseif bit32.band(flags, ImGuiColorEditFlags.PickerHueBar) ~= 0 then
        -- Render SV Square
        draw_list:AddRectFilledMultiColor(picker_pos, picker_pos + ImVec2(sv_picker_size, sv_picker_size), col_white, hue_color32, hue_color32, col_white)
        draw_list:AddRectFilledMultiColor(picker_pos, picker_pos + ImVec2(sv_picker_size, sv_picker_size), 0, 0, col_black, col_black)
        ImGui.RenderFrameBorder(picker_pos, picker_pos + ImVec2(sv_picker_size, sv_picker_size), 0.0)

        -- Sneakily prevent the circle to stick out too much
        sv_cursor_pos.x = ImClamp(IM_ROUND(picker_pos.x + ImSaturate(S) * sv_picker_size), picker_pos.x + 2, picker_pos.x + sv_picker_size - 2)
        sv_cursor_pos.y = ImClamp(IM_ROUND(picker_pos.y + ImSaturate(1 - V) * sv_picker_size), picker_pos.y + 2, picker_pos.y + sv_picker_size - 2)

        -- Render Hue Bar
        for i = 1, 6 do
            draw_list:AddRectFilledMultiColor(ImVec2(bar0_pos_x, picker_pos.y + (i - 1) * (sv_picker_size / 6)), ImVec2(bar0_pos_x + bars_width, picker_pos.y + i * (sv_picker_size / 6)), col_hues[i], col_hues[i], col_hues[i + 1], col_hues[i + 1])
        end

        local bar0_line_y = IM_ROUND(picker_pos.y + H * sv_picker_size)
        ImGui.RenderFrameBorder(ImVec2(bar0_pos_x, picker_pos.y), ImVec2(bar0_pos_x + bars_width, picker_pos.y + sv_picker_size), 0.0)
        RenderArrowsForVerticalBar(draw_list, ImVec2(bar0_pos_x - 1, bar0_line_y), ImVec2(bars_triangles_half_sz + 1, bars_triangles_half_sz), bars_width + 2.0, style.Alpha)
    end

    -- Render cursor/preview circle (clamp S/V within 0..1 range because floating points colors may lead HSV values to be out of range)
    local sv_cursor_rad = value_changed_sv and (wheel_thickness * 0.55) or (wheel_thickness * 0.40)
    local sv_cursor_segments = draw_list:_CalcCircleAutoSegmentCount(sv_cursor_rad)  -- Lock segment count so the +1 one matches others.
    draw_list:AddCircleFilled(sv_cursor_pos, sv_cursor_rad, user_col32_striped_of_alpha, sv_cursor_segments)
    draw_list:AddCircle(sv_cursor_pos, sv_cursor_rad + 1, col_midgrey, sv_cursor_segments)
    draw_list:AddCircle(sv_cursor_pos, sv_cursor_rad, col_white, sv_cursor_segments)

    -- Render alpha bar
    if alpha_bar then
        local alpha = ImSaturate(col[4])
        local bar1_bb = ImRect(bar1_pos_x, picker_pos.y, bar1_pos_x + bars_width, picker_pos.y + sv_picker_size)
        ImGui.RenderColorRectWithAlphaCheckerboard(draw_list, bar1_bb.Min, bar1_bb.Max, 0, bar1_bb:GetWidth() / 2.0, ImVec2(0.0, 0.0))
        draw_list:AddRectFilledMultiColor(bar1_bb.Min, bar1_bb.Max, user_col32_striped_of_alpha, user_col32_striped_of_alpha, bit32.band(user_col32_striped_of_alpha, bit32.bnot(IM_COL32_A_MASK)), bit32.band(user_col32_striped_of_alpha, bit32.bnot(IM_COL32_A_MASK)))

        local bar1_line_y = IM_ROUND(picker_pos.y + (1.0 - alpha) * sv_picker_size)
        ImGui.RenderFrameBorder(bar1_bb.Min, bar1_bb.Max, 0.0)
        RenderArrowsForVerticalBar(draw_list, ImVec2(bar1_pos_x - 1, bar1_line_y), ImVec2(bars_triangles_half_sz + 1, bars_triangles_half_sz), bars_width + 2.0, style.Alpha)
    end

    ImGui.EndGroup()

    if value_changed then
        for i = 1, components do
            if backup_initial_col[i] ~= col[i] then
                break
            end
            if i == components then
                value_changed = false
            end
        end
    end

    if value_changed and g.LastItemData.ID ~= 0 then -- In case of ID collision, the second EndGroup() won't catch g.ActiveId
        ImGui.MarkItemEdited(g.LastItemData.ID)
    end

    if set_current_color_edit_id then
        g.ColorEditCurrentID = 0
    end

    ImGui.PopID()

    return value_changed
end

end

--- @param desc_id   string
--- @param col       ImVec4
--- @param flags?    ImGuiColorEditFlags
--- @param size_arg? ImVec2
function ImGui.ColorButton(desc_id, col, flags, size_arg)
    if flags    == nil then flags    = 0            end
    if size_arg == nil then size_arg = ImVec2(0, 0) end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local id = window:GetID(desc_id)
    local default_size = ImGui.GetFrameHeight()
    local size = ImVec2(size_arg.x == 0.0 and default_size or size_arg.x, size_arg.y == 0.0 and default_size or size_arg.y)
    local bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + size)
    ImGui.ItemSize(bb, (size.y >= default_size) and g.Style.FramePadding.y or 0.0)
    if not ImGui.ItemAdd(bb, id) then
        return false
    end

    local pressed, hovered, _ = ImGui.ButtonBehavior(bb, id)

    if bit32.band(flags, bit32.bor(ImGuiColorEditFlags.NoAlpha, ImGuiColorEditFlags.AlphaOpaque)) ~= 0 then
        flags = bit32.band(flags, bit32.bnot(bit32.bor(ImGuiColorEditFlags.AlphaNoBg, ImGuiColorEditFlags.AlphaPreviewHalf)))
    end

    local col_rgb = ImVec4(col.x, col.y, col.z, col.w)
    if bit32.band(flags, ImGuiColorEditFlags.InputHSV) ~= 0 then
        col_rgb.x, col_rgb.y, col_rgb.z = ImGui.ColorConvertHSVtoRGB(col_rgb.x, col_rgb.y, col_rgb.z)
    end

    local col_rgb_without_alpha = ImVec4(col_rgb.x, col_rgb.y, col_rgb.z, 1.0)
    local grid_step = ImMin(size.x, size.y) / 2.99
    local rounding = ImMin(g.Style.FrameRounding, grid_step * 0.5)
    local bb_inner = ImRect()
    ImRect_Copy(bb_inner, bb)
    local off = 0.0
    if bit32.band(flags, ImGuiColorEditFlags.NoBorder) == 0 then
        off = -0.75
        bb_inner:Expand(off)
    end
    if bit32.band(flags, ImGuiColorEditFlags.AlphaPreviewHalf) ~= 0 and col_rgb.w < 1.0 then
        local mid_x = IM_ROUND((bb_inner.Min.x + bb_inner.Max.x) * 0.5)
        if bit32.band(flags, ImGuiColorEditFlags.AlphaNoBg) == 0 then
            ImGui.RenderColorRectWithAlphaCheckerboard(window.DrawList, ImVec2(bb_inner.Min.x + grid_step, bb_inner.Min.y), bb_inner.Max, ImGui.GetColorU32(col_rgb), grid_step, ImVec2(-grid_step + off, off), rounding, ImDrawFlags.RoundCornersRight)
        else
            window.DrawList:AddRectFilled(ImVec2(bb_inner.Min.x + grid_step, bb_inner.Min.y), bb_inner.Max, ImGui.GetColorU32(col_rgb), rounding, ImDrawFlags.RoundCornersRight)
        end
        window.DrawList:AddRectFilled(bb_inner.Min, ImVec2(mid_x, bb_inner.Max.y), ImGui.GetColorU32(col_rgb_without_alpha), rounding, ImDrawFlags.RoundCornersLeft)
    else
        local col_source = (bit32.band(flags, ImGuiColorEditFlags.AlphaOpaque) ~= 0) and col_rgb_without_alpha or col_rgb
        if col_source.w < 1.0 and bit32.band(flags, ImGuiColorEditFlags.AlphaNoBg) == 0 then
            ImGui.RenderColorRectWithAlphaCheckerboard(window.DrawList, bb_inner.Min, bb_inner.Max, ImGui.GetColorU32(col_source), grid_step, ImVec2(off, off), rounding)
        else
            window.DrawList:AddRectFilled(bb_inner.Min, bb_inner.Max, ImGui.GetColorU32(col_source), rounding)
        end
    end
    ImGui.RenderNavCursor(bb, id)
    if bit32.band(flags, ImGuiColorEditFlags.NoBorder) == 0 then
        if g.Style.FrameBorderSize > 0.0 then
            ImGui.RenderFrameBorder(bb.Min, bb.Max, rounding)
        else
            window.DrawList:AddRect(bb.Min, bb.Max, ImGui.GetColorU32(ImGuiCol.FrameBg), rounding)
        end
    end

    -- Drag and Drop Source
    -- NB: The ActiveId test is merely an optional micro-optimization, BeginDragDropSource() does the same test.
    -- if g.ActiveId == id and bit32.band(flags, ImGuiColorEditFlags.NoDragDrop) == 0 and ImGui.BeginDragDropSource() then
    --     if bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0 then
    --         ImGui.SetDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_3F, col_rgb, ImGuiCond.Once)
    --     else
    --         ImGui.SetDragDropPayload(IMGUI_PAYLOAD_TYPE_COLOR_4F, col_rgb, ImGuiCond.Once)
    --     end
    --     ImGui.ColorButton(desc_id, col, flags)
    --     ImGui.SameLine()
    --     ImGui.TextEx("Color")
    --     ImGui.EndDragDropSource()
    -- end

    -- Tooltip
    if bit32.band(flags, ImGuiColorEditFlags.NoTooltip) == 0 and hovered and ImGui.IsItemHovered(ImGuiHoveredFlags.ForTooltip) then
        ImGui.ColorTooltip(desc_id, col, bit32.band(flags, bit32.bor(ImGuiColorEditFlags.InputMask_, ImGuiColorEditFlags.AlphaMask_)))
    end

    return pressed
end

--- @param text? string
--- @param col   ImVec4
--- @param flags ImGuiColorEditFlags
function ImGui.ColorTooltip(text, col, flags)
    local g = GImGui

    if not ImGui.BeginTooltipEx(ImGuiTooltipFlags.OverridePrevious, ImGuiWindowFlags.None) then
        return
    end

    local text_end = text and ImGui.FindRenderedTextEnd(text, nil) or 1
    if text_end > 1 then
        --- @cast text string
        ImGui.TextEx(text, text_end)
        ImGui.Separator()
    end

    local sz = ImVec2(g.FontSize * 3 + g.Style.FramePadding.y * 2, g.FontSize * 3 + g.Style.FramePadding.y * 2)
    local cf = ImVec4(col.x, col.y, col.z, (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0) and 1.0 or col.w)
    local cr = IM_F32_TO_INT8_SAT(col.x)
    local cg = IM_F32_TO_INT8_SAT(col.y)
    local cb = IM_F32_TO_INT8_SAT(col.z)
    local ca = (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0) and 255 or IM_F32_TO_INT8_SAT(col.w)

    local flags_to_forward = bit32.bor(ImGuiColorEditFlags.InputMask_, ImGuiColorEditFlags.AlphaMask_)
    ImGui.ColorButton("##preview", cf, bit32.bor(bit32.band(flags, flags_to_forward), ImGuiColorEditFlags.NoTooltip), sz)
    ImGui.SameLine()

    if bit32.band(flags, ImGuiColorEditFlags.InputRGB) ~= 0 or bit32.band(flags, ImGuiColorEditFlags.InputMask_) == 0 then
        if bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0 then
            ImGui.Text("#%02X%02X%02X\nR: %d, G: %d, B: %d\n(%.3f, %.3f, %.3f)", cr, cg, cb, cr, cg, cb, col.x, col.y, col.z)
        else
            ImGui.Text("#%02X%02X%02X%02X\nR:%d, G:%d, B:%d, A:%d\n(%.3f, %.3f, %.3f, %.3f)", cr, cg, cb, ca, cr, cg, cb, ca, col.x, col.y, col.z, col.w)
        end
    elseif bit32.band(flags, ImGuiColorEditFlags.InputHSV) ~= 0 then
        if bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0 then
            ImGui.Text("H: %.3f, S: %.3f, V: %.3f", col.x, col.y, col.z)
        else
            ImGui.Text("H: %.3f, S: %.3f, V: %.3f, A: %.3f", col.x, col.y, col.z, col.w)
        end
    end

    ImGui.EndTooltip()
end

--- @param col   float[]
--- @param flags ImGuiColorEditFlags
function ImGui.ColorEditOptionsPopup(col, flags)
    local allow_opt_inputs = bit32.band(flags, ImGuiColorEditFlags.DisplayMask_) == 0
    local allow_opt_datatype = bit32.band(flags, ImGuiColorEditFlags.DataTypeMask_) == 0

    if (not allow_opt_inputs and not allow_opt_datatype) or not ImGui.BeginPopup("context") then
        return
    end

    local g = GImGui
    ImGui.PushItemFlag(ImGuiItemFlags.NoMarkEdited, true)
    local opts = g.IO.ConfigColorEditFlags
    if allow_opt_inputs then
        if ImGui.RadioButtonEx("RGB", bit32.band(opts, ImGuiColorEditFlags.DisplayRGB) ~= 0) then
            opts = bit32.bor(bit32.band(opts, bit32.bnot(ImGuiColorEditFlags.DisplayMask_)), ImGuiColorEditFlags.DisplayRGB)
        end
        if ImGui.RadioButtonEx("HSV", bit32.band(opts, ImGuiColorEditFlags.DisplayHSV) ~= 0) then
            opts = bit32.bor(bit32.band(opts, bit32.bnot(ImGuiColorEditFlags.DisplayMask_)), ImGuiColorEditFlags.DisplayHSV)
        end
        if ImGui.RadioButtonEx("Hex", bit32.band(opts, ImGuiColorEditFlags.DisplayHex) ~= 0) then
            opts = bit32.bor(bit32.band(opts, bit32.bnot(ImGuiColorEditFlags.DisplayMask_)), ImGuiColorEditFlags.DisplayHex)
        end
    end
    if allow_opt_datatype then
        if allow_opt_inputs then ImGui.Separator() end
        if ImGui.RadioButtonEx("0..255", bit32.band(opts, ImGuiColorEditFlags.Uint8) ~= 0) then
            opts = bit32.bor(bit32.band(opts, bit32.bnot(ImGuiColorEditFlags.DataTypeMask_)), ImGuiColorEditFlags.Uint8)
        end
        if ImGui.RadioButtonEx("0.00..1.00", bit32.band(opts, ImGuiColorEditFlags.Float) ~= 0) then
            opts = bit32.bor(bit32.band(opts, bit32.bnot(ImGuiColorEditFlags.DataTypeMask_)), ImGuiColorEditFlags.Float)
        end
    end

    if allow_opt_inputs or allow_opt_datatype then
        ImGui.Separator()
    end
    if ImGui.Button("Copy as..", ImVec2(-1, 0)) then
        ImGui.OpenPopup("Copy")
    end
    if ImGui.BeginPopup("Copy") then
        local cr = IM_F32_TO_INT8_SAT(col[1])
        local cg = IM_F32_TO_INT8_SAT(col[2])
        local cb = IM_F32_TO_INT8_SAT(col[3])
        local ca = (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0) and 255 or IM_F32_TO_INT8_SAT(col[4])

        local buf1 = ImFormatString("(%.3ff, %.3ff, %.3ff, %.3ff)", col[1], col[2], col[3], (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) ~= 0) and 1.0 or col[4])
        if ImGui.Selectable(buf1) then
            ImGui.SetClipboardText(buf1)
        end

        local buf2 = ImFormatString("(%d,%d,%d,%d)", cr, cg, cb, ca)
        if ImGui.Selectable(buf2) then
            ImGui.SetClipboardText(buf2)
        end

        local buf3 = ImFormatString("#%02X%02X%02X", cr, cg, cb)
        if ImGui.Selectable(buf3) then
            ImGui.SetClipboardText(buf3)
        end

        if bit32.band(flags, ImGuiColorEditFlags.NoAlpha) == 0 then
            local buf4 = ImFormatString("#%02X%02X%02X%02X", cr, cg, cb, ca)
            if ImGui.Selectable(buf4) then
                ImGui.SetClipboardText(buf4)
            end
        end

        ImGui.EndPopup()
    end

    g.IO.ConfigColorEditFlags = opts
    ImGui.PopItemFlag()
    ImGui.EndPopup()
end

--- @param ref_col float[]
--- @param flags   ImGuiColorEditFlags
function ImGui.ColorPickerOptionsPopup(ref_col, flags)
    local allow_opt_picker = bit32.band(flags, ImGuiColorEditFlags.PickerMask_) == 0
    local allow_opt_alpha_bar = (bit32.band(flags, ImGuiColorEditFlags.NoAlpha) == 0) and (bit32.band(flags, ImGuiColorEditFlags.AlphaBar) == 0)

    if (not allow_opt_picker and not allow_opt_alpha_bar) or not ImGui.BeginPopup("context") then
        return
    end

    local g = GImGui
    ImGui.PushItemFlag(ImGuiItemFlags.NoMarkEdited, true)
    if allow_opt_picker then
        local picker_size = ImVec2(g.FontSize * 8, ImMax(g.FontSize * 8 - (ImGui.GetFrameHeight() + g.Style.ItemInnerSpacing.x), 1.0)) -- FIXME: Picker size copied from main picker function
        ImGui.PushItemWidth(picker_size.x)
        for picker_type = 0, 1 do
            if picker_type > 0 then
                ImGui.Separator()
            end
            ImGui.PushID(picker_type)
            local picker_flags = bit32.bor(ImGuiColorEditFlags.NoInputs, ImGuiColorEditFlags.NoOptions, ImGuiColorEditFlags.NoLabel, ImGuiColorEditFlags.NoSidePreview, bit32.band(flags, ImGuiColorEditFlags.NoAlpha))
            if picker_type == 0 then
                picker_flags = bit32.bor(picker_flags, ImGuiColorEditFlags.PickerHueBar)
            end
            if picker_type == 1 then
                picker_flags = bit32.bor(picker_flags, ImGuiColorEditFlags.PickerHueWheel)
            end
            local backup_pos = ImGui.GetCursorScreenPos()
            -- By default, Selectable() is closing popup
            if ImGui.Selectable("##selectable", false, 0, picker_size) then
                g.IO.ConfigColorEditFlags = bit32.bor(bit32.band(g.IO.ConfigColorEditFlags, bit32.bnot(ImGuiColorEditFlags.PickerMask_)), bit32.band(picker_flags, ImGuiColorEditFlags.PickerMask_))
            end
            ImGui.SetCursorScreenPos(backup_pos)
            local previewing_ref_col = ImVec4()
            for i = 1, (bit32.band(picker_flags, ImGuiColorEditFlags.NoAlpha) ~= 0 and 3 or 4) do
                previewing_ref_col[i] = ref_col[i]
            end
            ImGui.ColorPicker4("##previewing_picker", previewing_ref_col, picker_flags)
            ImGui.PopID()
        end
        ImGui.PopItemWidth()
    end
    if allow_opt_alpha_bar then
        if allow_opt_picker then
            ImGui.Separator()
        end
        _, g.IO.ConfigColorEditFlags = ImGui.CheckboxFlags("Alpha Bar", g.IO.ConfigColorEditFlags, ImGuiColorEditFlags.AlphaBar)
    end
    ImGui.PopItemFlag()
    ImGui.EndPopup()
end

----------------------------------------------------------------
-- [SECTION] TREES
----------------------------------------------------------------

-- va_list variants: identical in Lua (varargs)
ImGui.TextColoredV = function(...) return ImGui.TextColored(...) end
ImGui.TextDisabledV = function(...) return ImGui.TextDisabled(...) end
ImGui.TextWrappedV = function(...) return ImGui.TextWrapped(...) end
ImGui.TextAlignedV = function(...) return ImGui.TextAligned(...) end
ImGui.LabelTextV = function(...) return ImGui.LabelText(...) end
ImGui.BulletTextV = function(...) return ImGui.BulletText(...) end

--- @param data_type ImGuiDataType
--- @param v         number
function ImGui.SetNextItemRefVal(data_type, v)
    local g = GImGui
    g.NextItemData.HasFlags = bit32.bor(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasRefVal)
    g.NextItemData.RefVal = v
end

-- Overloads: TreeNode(label) / TreeNode(str_id, fmt, ...)
--- @param label string
function ImGui.TreeNode(label, fmt, ...)
    if fmt ~= nil then
        return ImGui.TreeNodeEx(label, 0, fmt, ...)
    end
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end
    local id = window:GetID(label)
    return ImGui.TreeNodeBehavior(id, ImGuiTreeNodeFlags.None, label, nil)
end

function ImGui.TreeNodeV(str_id, fmt, ...)
    return ImGui.TreeNodeExV(str_id, 0, fmt, ...)
end

-- Overloads: TreeNodeEx(label, flags) / TreeNodeEx(str_id, flags, fmt, ...)
--- @param label  string
--- @param flags? ImGuiTreeNodeFlags
function ImGui.TreeNodeEx(label, flags, fmt, ...)
    if flags == nil then flags = 0 end
    if fmt ~= nil then
        return ImGui.TreeNodeExV(label, flags, fmt, ...)
    end
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end
    local id = window:GetID(label)
    return ImGui.TreeNodeBehavior(id, flags, label, nil)
end

--- @param str_id string|ImGuiID
function ImGui.TreeNodeExV(str_id, flags, fmt, ...)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end
    local id = window:GetID(str_id)
    local label = (select("#", ...) > 0) and string.format(fmt, ...) or fmt
    return ImGui.TreeNodeBehavior(id, flags, label, #label + 1)
end

--- @param storage_id ImGuiID
function ImGui.TreeNodeGetOpen(storage_id)
    local g = GImGui
    local storage = g.CurrentWindow.DC.StateStorage
    return (storage[storage_id]) and true or false
end

--- @param storage_id ImGuiID
--- @param is_open    bool
function ImGui.TreeNodeSetOpen(storage_id, is_open)
    local g = GImGui
    local storage = g.CurrentWindow.DC.StateStorage
    storage[storage_id] = is_open
end

--- @param storage_id ImGuiID
--- @param flags      ImGuiTreeNodeFlags
function ImGui.TreeNodeUpdateNextOpen(storage_id, flags)
    if bit32.band(flags, ImGuiTreeNodeFlags.Leaf) ~= 0 then
        return true
    end

    local g = GImGui
    local window = g.CurrentWindow
    local storage = window.DC.StateStorage

    local is_open
    if bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasOpen) ~= 0 then
        if bit32.band(g.NextItemData.OpenCond, ImGuiCond.Always) ~= 0 then
            is_open = g.NextItemData.OpenVal
            ImGui.TreeNodeSetOpen(storage_id, is_open)
        else
            local stored_value = storage[storage_id]
            if stored_value == nil then
                is_open = g.NextItemData.OpenVal
                ImGui.TreeNodeSetOpen(storage_id, is_open)
            else
                is_open = stored_value and true or false
            end
        end
    else
        is_open = (storage[storage_id] == nil) and (bit32.band(flags, ImGuiTreeNodeFlags.DefaultOpen) ~= 0) or storage[storage_id]
    end

    if g.LogEnabled and bit32.band(flags, ImGuiTreeNodeFlags.NoAutoOpenOnLog) == 0 and (window.DC.TreeDepth - g.LogDepthRef) < g.LogDepthToExpand then
        is_open = true
    end

    return is_open
end

--- @param flags ImGuiTreeNodeFlags
--- @param x1    float
local function TreeNodeStoreStackData(flags, x1)
    local g = GImGui
    local window = g.CurrentWindow

    g.TreeNodeStack:resize(g.TreeNodeStack.Size + 1)
    local tree_node_data = g.TreeNodeStack.Data[g.TreeNodeStack.Size]
    tree_node_data.ID = g.LastItemData.ID
    tree_node_data.TreeFlags = flags
    tree_node_data.ItemFlags = g.LastItemData.ItemFlags
    ImRect_Copy(tree_node_data.NavRect, g.LastItemData.NavRect)

    local draw_lines = bit32.band(flags, bit32.bor(ImGuiTreeNodeFlags.DrawLinesFull, ImGuiTreeNodeFlags.DrawLinesToNodes)) ~= 0
    tree_node_data.DrawLinesX1 = draw_lines and (x1 + g.FontSize * 0.5 + g.Style.FramePadding.x) or FLT_MAX
    tree_node_data.DrawLinesTableColumn = (draw_lines and g.CurrentTable) and g.CurrentTable.CurrentColumn or -1
    tree_node_data.DrawLinesToNodesY2 = -FLT_MAX
    window.DC.TreeHasStackDataDepthMask = bit32.bor(window.DC.TreeHasStackDataDepthMask, bit32.lshift(1, window.DC.TreeDepth))
    if bit32.band(flags, ImGuiTreeNodeFlags.DrawLinesToNodes) ~= 0 then
        window.DC.TreeRecordsClippedNodesY2Mask = bit32.bor(window.DC.TreeRecordsClippedNodesY2Mask, bit32.lshift(1, window.DC.TreeDepth))
    end
end

--- @param id         ImGuiID
--- @param flags      ImGuiTreeNodeFlags
--- @param label      string
--- @param label_end? int
function ImGui.TreeNodeBehavior(id, flags, label, label_end)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local style = g.Style

    local display_frame = bit32.band(flags, ImGuiTreeNodeFlags.Framed) ~= 0
    local use_frame_padding = display_frame or (bit32.band(flags, ImGuiTreeNodeFlags.FramePadding) ~= 0)
    local padding
    if use_frame_padding then
        padding = style.FramePadding
    else
        padding = ImVec2(style.FramePadding.x, ImMin(window.DC.CurrLineTextBaseOffset, style.FramePadding.y))
    end

    if label_end == nil then
        label_end = ImGui.FindRenderedTextEnd(label)
    end
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local text_offset_x = g.FontSize + (display_frame and (padding.x * 3) or (padding.x * 2))
    local text_offset_y = use_frame_padding and ImMax(style.FramePadding.y, window.DC.CurrLineTextBaseOffset) or window.DC.CurrLineTextBaseOffset
    local text_width = g.FontSize + label_size.x + padding.x * 2

    local frame_height = label_size.y + padding.y * 2
    local span_all_columns = bit32.band(flags, ImGuiTreeNodeFlags.SpanAllColumns) ~= 0 and (g.CurrentTable ~= nil)
    local span_all_columns_label = bit32.band(flags, ImGuiTreeNodeFlags.LabelSpanAllColumns) ~= 0 and (g.CurrentTable ~= nil)
    local frame_bb = ImRect()
    frame_bb.Min.x = span_all_columns and window.ParentWorkRect.Min.x or (bit32.band(flags, ImGuiTreeNodeFlags.SpanFullWidth) ~= 0 and window.WorkRect.Min.x or window.DC.CursorPos.x)
    frame_bb.Min.y = window.DC.CursorPos.y + (text_offset_y - padding.y)
    frame_bb.Max.x = span_all_columns and window.ParentWorkRect.Max.x or (bit32.band(flags, ImGuiTreeNodeFlags.SpanLabelWidth) ~= 0 and window.DC.CursorPos.x + text_width + padding.x or window.WorkRect.Max.x)
    frame_bb.Max.y = window.DC.CursorPos.y + (text_offset_y - padding.y) + frame_height
    if display_frame then
        local outer_extend = IM_TRUNC(window.WindowPadding.x * 0.5)
        frame_bb.Min.x = frame_bb.Min.x - outer_extend
        frame_bb.Max.x = frame_bb.Max.x + outer_extend
    end

    local text_pos = ImVec2(window.DC.CursorPos.x + text_offset_x, window.DC.CursorPos.y + text_offset_y)
    ImGui.ItemSize(ImVec2(text_width, frame_height), padding.y)

    local interact_bb = ImRect()
    ImRect_Copy(interact_bb, frame_bb)
    if bit32.band(flags, bit32.bor(ImGuiTreeNodeFlags.Framed, ImGuiTreeNodeFlags.SpanAvailWidth, ImGuiTreeNodeFlags.SpanFullWidth, ImGuiTreeNodeFlags.SpanLabelWidth, ImGuiTreeNodeFlags.SpanAllColumns)) == 0 then
        interact_bb.Max.x = frame_bb.Min.x + text_width + (label_size.x > 0.0 and (style.ItemSpacing.x * 2.0) or 0.0)
    end

    local storage_id = (bit32.band(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasStorageID) ~= 0) and g.NextItemData.StorageId or id
    local is_open = ImGui.TreeNodeUpdateNextOpen(storage_id, flags)

    local is_visible
    if span_all_columns or span_all_columns_label then
        local backup_clip_rect_min_x = window.ClipRect.Min.x
        local backup_clip_rect_max_x = window.ClipRect.Max.x
        window.ClipRect.Min.x = window.ParentWorkRect.Min.x
        window.ClipRect.Max.x = window.ParentWorkRect.Max.x
        is_visible = ImGui.ItemAdd(interact_bb, id)
        window.ClipRect.Min.x = backup_clip_rect_min_x
        window.ClipRect.Max.x = backup_clip_rect_max_x
    else
        is_visible = ImGui.ItemAdd(interact_bb, id)
    end
    g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasDisplayRect)
    ImRect_Copy(g.LastItemData.DisplayRect, frame_bb)

    local store_tree_node_stack_data = false
    if bit32.band(flags, ImGuiTreeNodeFlags.DrawLinesMask_) == 0 then
        flags = bit32.bor(flags, g.Style.TreeLinesFlags)
    end
    local draw_tree_lines = (bit32.band(flags, bit32.bor(ImGuiTreeNodeFlags.DrawLinesFull, ImGuiTreeNodeFlags.DrawLinesToNodes)) ~= 0) and (frame_bb.Min.y < window.ClipRect.Max.y) and (g.Style.TreeLinesSize > 0.0)
    if bit32.band(flags, ImGuiTreeNodeFlags.NoTreePushOnOpen) == 0 then
        store_tree_node_stack_data = draw_tree_lines
        if bit32.band(flags, ImGuiTreeNodeFlags.NavLeftJumpsToParent) ~= 0 and not g.NavIdIsAlive then
            if g.NavMoveDir == ImGuiDir.Left and g.NavWindow == window and ImGui.NavMoveRequestButNoResultYet() then
                store_tree_node_stack_data = true
            end
        end
    end

    local is_leaf = bit32.band(flags, ImGuiTreeNodeFlags.Leaf) ~= 0
    if not is_visible then
        if bit32.band(flags, ImGuiTreeNodeFlags.DrawLinesToNodes) ~= 0 and bit32.band(window.DC.TreeRecordsClippedNodesY2Mask, bit32.lshift(1, (window.DC.TreeDepth - 1))) ~= 0 then
            local parent_data = g.TreeNodeStack.Data[g.TreeNodeStack.Size]
            parent_data.DrawLinesToNodesY2 = ImMax(parent_data.DrawLinesToNodesY2, window.DC.CursorPos.y)
            if frame_bb.Min.y >= window.ClipRect.Max.y then
                window.DC.TreeRecordsClippedNodesY2Mask = bit32.band(window.DC.TreeRecordsClippedNodesY2Mask, bit32.bnot(bit32.lshift(1, (window.DC.TreeDepth - 1))))
            end
        end
        if is_open and store_tree_node_stack_data then
            TreeNodeStoreStackData(flags, text_pos.x - text_offset_x)
        end
        if is_open and bit32.band(flags, ImGuiTreeNodeFlags.NoTreePushOnOpen) == 0 then
            ImGui.TreePushOverrideID(id)
        end
        -- IMGUI_TEST_ENGINE_ITEM_INFO(g.LastItemData.ID, label, g.LastItemData.StatusFlags | (is_leaf ? 0 : ImGuiItemStatusFlags_Openable) | (is_open ? ImGuiItemStatusFlags_Opened : 0))
        return is_open
    end

    if span_all_columns or span_all_columns_label then
        ImGui.TablePushBackgroundChannel()
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasClipRect)
        ImRect_Copy(g.LastItemData.ClipRect, window.ClipRect)
    end

    local button_flags = ImGuiTreeNodeFlags.None
    if bit32.band(flags, ImGuiTreeNodeFlags.AllowOverlap) ~= 0 or bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.AllowOverlap) ~= 0 then
        button_flags = bit32.bor(button_flags, ImGuiButtonFlags.AllowOverlap)
    end
    if not is_leaf then
        button_flags = bit32.bor(button_flags, ImGuiButtonFlags.PressedOnDragDropHold)
    end

    local arrow_hit_x1 = (text_pos.x - text_offset_x) - style.TouchExtraPadding.x
    local arrow_hit_x2 = (text_pos.x - text_offset_x) + (g.FontSize + padding.x * 2.0) + style.TouchExtraPadding.x
    local is_mouse_x_over_arrow = (g.IO.MousePos.x >= arrow_hit_x1 and g.IO.MousePos.x < arrow_hit_x2)

    local is_multi_select = bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.IsMultiSelect) ~= 0
    if is_multi_select then
        flags = bit32.bor(flags, (bit32.band(flags, ImGuiTreeNodeFlags.OpenOnMask_) == 0) and bit32.bor(ImGuiTreeNodeFlags.OpenOnArrow, ImGuiTreeNodeFlags.OpenOnDoubleClick) or ImGuiTreeNodeFlags.OpenOnArrow)
    end

    if is_mouse_x_over_arrow then
        button_flags = bit32.bor(button_flags, ImGuiButtonFlags.PressedOnClick)
    elseif bit32.band(flags, ImGuiTreeNodeFlags.OpenOnDoubleClick) ~= 0 then
        button_flags = bit32.bor(button_flags, ImGuiButtonFlags.PressedOnClickRelease, ImGuiButtonFlags.PressedOnDoubleClick)
    else
        button_flags = bit32.bor(button_flags, ImGuiButtonFlags.PressedOnClickRelease)
    end
    if bit32.band(flags, ImGuiTreeNodeFlags.NoNavFocus) ~= 0 then
        button_flags = bit32.bor(button_flags, ImGuiButtonFlags.NoNavFocus)
    end

    local selected = bit32.band(flags, ImGuiTreeNodeFlags.Selected) ~= 0
    local was_selected = selected

    if is_multi_select then
        selected, button_flags = ImGui.MultiSelectItemHeader(id, selected, button_flags)
        if is_mouse_x_over_arrow then
            button_flags = bit32.band(bit32.bor(button_flags, ImGuiButtonFlags.PressedOnClick), bit32.bnot(ImGuiButtonFlags.PressedOnClickRelease))
        end
    else
        if window ~= g.HoveredWindow or not is_mouse_x_over_arrow then
            button_flags = bit32.bor(button_flags, ImGuiButtonFlags.NoKeyModsAllowed)
        end
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(interact_bb, id, button_flags)
    local toggled = false
    if not is_leaf then
        if pressed and g.DragDropHoldJustPressedId ~= id then
            if bit32.band(flags, ImGuiTreeNodeFlags.OpenOnMask_) == 0 or (g.NavActivateId == id and not is_multi_select) then
                toggled = true
            end
            if bit32.band(flags, ImGuiTreeNodeFlags.OpenOnArrow) ~= 0 then
                toggled = toggled or (is_mouse_x_over_arrow and not g.NavHighlightItemUnderNav)
            end
            if bit32.band(flags, ImGuiTreeNodeFlags.OpenOnDoubleClick) ~= 0 and g.IO.MouseClickedCount[0] == 2 then
                toggled = true
            end
        elseif pressed and g.DragDropHoldJustPressedId == id then
            IM_ASSERT(bit32.band(button_flags, ImGuiButtonFlags.PressedOnDragDropHold) ~= 0)
            if not is_open then
                toggled = true
            else
                pressed = false
            end
        end

        if g.NavId == id and g.NavMoveDir == ImGuiDir.Left and is_open then
            toggled = true
            ImGui.NavClearPreferredPosForAxis(ImGuiAxis.X)
            ImGui.NavMoveRequestCancel()
        end
        if g.NavId == id and g.NavMoveDir == ImGuiDir.Right and not is_open then
            toggled = true
            ImGui.NavClearPreferredPosForAxis(ImGuiAxis.X)
            ImGui.NavMoveRequestCancel()
        end

        if toggled then
            is_open = not is_open
            window.DC.StateStorage[storage_id] = is_open
            g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.ToggledOpen)
        end
    end

    if is_multi_select then
        local pressed_copy = pressed and not toggled
        selected, pressed_copy = ImGui.MultiSelectItemFooter(id, selected, pressed_copy)
        if pressed then
            ImGui.SetNavID(id, window.DC.NavLayerCurrent, g.CurrentFocusScopeId, interact_bb)
        end
    end

    if selected ~= was_selected then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.ToggledSelection)
    end

    -- Render
    do
        local text_col = ImGui.GetColorU32(ImGuiCol.Text)
        local nav_render_cursor_flags = ImGuiNavRenderCursorFlags.Compact
        if is_multi_select then
            nav_render_cursor_flags = bit32.bor(nav_render_cursor_flags, ImGuiNavRenderCursorFlags.AlwaysDraw)
        end
        if display_frame then
            local bg_col = ImGui.GetColorU32((held and hovered) and ImGuiCol.HeaderActive or (hovered and ImGuiCol.HeaderHovered or ImGuiCol.Header))
            ImGui.RenderFrame(frame_bb.Min, frame_bb.Max, bg_col, true, style.FrameRounding)
            ImGui.RenderNavCursor(frame_bb, id, nav_render_cursor_flags)
            if span_all_columns and not span_all_columns_label then
                ImGui.TablePopBackgroundChannel()
            end
            if bit32.band(flags, ImGuiTreeNodeFlags.Bullet) ~= 0 then
                ImGui.RenderBullet(window.DrawList, ImVec2(text_pos.x - text_offset_x * 0.60, text_pos.y + g.FontSize * 0.5), text_col)
            elseif not is_leaf then
                ImGui.RenderArrow(window.DrawList, ImVec2(text_pos.x - text_offset_x + padding.x, text_pos.y), text_col, is_open and ((bit32.band(flags, ImGuiTreeNodeFlags.UpsideDownArrow) ~= 0) and ImGuiDir.Up or ImGuiDir.Down) or ImGuiDir.Right, 1.0)
            else
                text_pos.x = text_pos.x - (text_offset_x - padding.x)
            end
            if bit32.band(flags, ImGuiTreeNodeFlags.ClipLabelForTrailingButton) ~= 0 then
                frame_bb.Max.x = frame_bb.Max.x - (g.FontSize + style.FramePadding.x)
            end
            -- if g.LogEnabled then
            --     ImGui.LogSetNextTextDecoration("###", "###")
            -- end
        else
            if hovered or selected then
                local bg_col = ImGui.GetColorU32((held and hovered) and ImGuiCol.HeaderActive or (hovered and ImGuiCol.HeaderHovered or ImGuiCol.Header))
                ImGui.RenderFrame(frame_bb.Min, frame_bb.Max, bg_col, false, 0.0)
            end
            ImGui.RenderNavCursor(frame_bb, id, nav_render_cursor_flags, 0.0)
            if span_all_columns and not span_all_columns_label then
                ImGui.TablePopBackgroundChannel()
            end
            if bit32.band(flags, ImGuiTreeNodeFlags.Bullet) ~= 0 then
                ImGui.RenderBullet(window.DrawList, ImVec2(text_pos.x - text_offset_x * 0.5, text_pos.y + g.FontSize * 0.5), text_col)
            elseif not is_leaf then
                ImGui.RenderArrow(window.DrawList, ImVec2(text_pos.x - text_offset_x + padding.x, text_pos.y + g.FontSize * 0.15), text_col, is_open and ((bit32.band(flags, ImGuiTreeNodeFlags.UpsideDownArrow) ~= 0) and ImGuiDir.Up or ImGuiDir.Down) or ImGuiDir.Right, 0.70)
            end
            -- if g.LogEnabled then
            --     ImGui.LogSetNextTextDecoration(">", nil)
            -- end
        end

        if draw_tree_lines then
            ImGui.TreeNodeDrawLineToChildNode(ImVec2(text_pos.x - text_offset_x + padding.x, text_pos.y + g.FontSize * 0.5))
        end

        if display_frame then
            ImGui.RenderTextClipped(text_pos, frame_bb.Max, label, label_end, label_size)
        else
            ImGui.RenderText(text_pos, label, 1, label_end, false)
        end

        if span_all_columns_label then
            ImGui.TablePopBackgroundChannel()
        end
    end

    if is_open and store_tree_node_stack_data then
        TreeNodeStoreStackData(flags, text_pos.x - text_offset_x)
    end
    if is_open and bit32.band(flags, ImGuiTreeNodeFlags.NoTreePushOnOpen) == 0 then
        ImGui.TreePushOverrideID(id)
    end

    -- IMGUI_TEST_ENGINE_ITEM_INFO(id, label, g.LastItemData.StatusFlags | (is_leaf ? 0 : ImGuiItemStatusFlags_Openable) | (is_open ? ImGuiItemStatusFlags_Opened : 0));
    return is_open
end

--- @param target_pos ImVec2
function ImGui.TreeNodeDrawLineToChildNode(target_pos)
    local g = GImGui
    local window = g.CurrentWindow
    if window.DC.TreeDepth == 0 or bit32.band(window.DC.TreeHasStackDataDepthMask, bit32.lshift(1, window.DC.TreeDepth - 1)) == 0 then
        return
    end

    local parent_data = g.TreeNodeStack.Data[g.TreeNodeStack.Size]
    local x1 = ImTrunc(parent_data.DrawLinesX1)
    local x2 = ImTrunc(target_pos.x - g.Style.ItemInnerSpacing.x)
    local y = ImTrunc(target_pos.y)
    local rounding = (g.Style.TreeLinesRounding > 0.0) and ImMin(x2 - x1, g.Style.TreeLinesRounding) or 0.0
    parent_data.DrawLinesToNodesY2 = ImMax(parent_data.DrawLinesToNodesY2, y - rounding)
    if x1 >= x2 then
        return
    end
    if rounding > 0.0 then
        x1 = x1 + 0.5 + rounding
        window.DrawList:PathArcToFast(ImVec2(x1, y - rounding), rounding, 6, 3)
        if x1 < x2 then
            window.DrawList:PathLineTo(ImVec2(x2, y))
        end
        window.DrawList:PathStroke(ImGui.GetColorU32(ImGuiCol.TreeLines), g.Style.TreeLinesSize)
    else
        window.DrawList:AddLineH(x1, x2, y, ImGui.GetColorU32(ImGuiCol.TreeLines), g.Style.TreeLinesSize)
    end
end

--- @param data ImGuiTreeNodeStackData
function ImGui.TreeNodeDrawLineToTreePop(data)
    local g = GImGui
    local window = g.CurrentWindow
    local y1 = ImMax(data.NavRect.Max.y, window.ClipRect.Min.y)
    local y2 = data.DrawLinesToNodesY2
    if bit32.band(data.TreeFlags, ImGuiTreeNodeFlags.DrawLinesFull) ~= 0 then
        local y2_full = window.DC.CursorPos.y
        if g.CurrentTable then
            y2_full = ImMax(g.CurrentTable.RowPosY2, y2_full)
        end
        y2_full = ImTrunc(y2_full - g.Style.ItemSpacing.y - g.FontSize * 0.5)
        if y2 + (g.Style.ItemSpacing.y + g.Style.TreeLinesRounding) < y2_full then
            y2 = y2_full
        end
    end
    y2 = ImMin(y2, window.ClipRect.Max.y)
    if y2 <= y1 then
        return
    end
    local x = ImTrunc(data.DrawLinesX1 - g.Style.TreeLinesSize * 0.5) + g.Style.TreeLinesSize * 0.5
    if data.DrawLinesTableColumn ~= -1 then
        ImGui.TablePushColumnChannel(data.DrawLinesTableColumn)
    end
    window.DrawList:AddLine(ImVec2(x, y1), ImVec2(x, y2), ImGui.GetColorU32(ImGuiCol.TreeLines), g.Style.TreeLinesSize)
    if data.DrawLinesTableColumn ~= -1 then
        ImGui.TablePopColumnChannel()
    end
end

--- @param str_id string|ImGuiID
function ImGui.TreePush(str_id)
    local window = ImGui.GetCurrentWindow()
    ImGui.Indent()
    window.DC.TreeDepth = window.DC.TreeDepth + 1
    ImGui.PushID(str_id)
end

--- @param id ImGuiID
function ImGui.TreePushOverrideID(id)
    local g = GImGui
    local window = g.CurrentWindow
    ImGui.Indent()
    window.DC.TreeDepth = window.DC.TreeDepth + 1
    ImGui.PushOverrideID(id)
end

function ImGui.TreePop()
    local g = GImGui
    local window = g.CurrentWindow
    ImGui.Unindent()

    window.DC.TreeDepth = window.DC.TreeDepth - 1
    local tree_depth_mask = bit32.lshift(1, window.DC.TreeDepth)

    if bit32.band(window.DC.TreeHasStackDataDepthMask, tree_depth_mask) ~= 0 then
        local data = g.TreeNodeStack.Data[g.TreeNodeStack.Size]
        IM_ASSERT(data.ID == window.IDStack:back())

        if bit32.band(data.TreeFlags, ImGuiTreeNodeFlags.NavLeftJumpsToParent) ~= 0 then
            if g.NavIdIsAlive and g.NavMoveDir == ImGuiDir.Left and g.NavWindow == window and ImGui.NavMoveRequestButNoResultYet() then
                ImGui.NavMoveRequestResolveWithPastTreeNode(g.NavMoveResultLocal, data)
            end
        end

        if data.DrawLinesX1 ~= FLT_MAX and window.DC.CursorPos.y >= window.ClipRect.Min.y then
            ImGui.TreeNodeDrawLineToTreePop(data)
        end

        g.TreeNodeStack:pop_back()
        window.DC.TreeHasStackDataDepthMask = bit32.band(window.DC.TreeHasStackDataDepthMask, bit32.bnot(tree_depth_mask))
        window.DC.TreeRecordsClippedNodesY2Mask = bit32.band(window.DC.TreeRecordsClippedNodesY2Mask, bit32.bnot(tree_depth_mask))
    end

    IM_ASSERT(window.IDStack.Size > 1)
    ImGui.PopID()
end

--- @param is_open bool
--- @param cond?   ImGuiCond
function ImGui.SetNextItemOpen(is_open, cond)
    if cond == nil then cond = 0 end

    local g = GImGui
    if g.CurrentWindow.SkipItems then
        return
    end
    g.NextItemData.HasFlags = bit32.bor(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasOpen)
    g.NextItemData.OpenVal = is_open
    g.NextItemData.OpenCond = (cond ~= 0) and cond or ImGuiCond.Always
end

-- Horizontal distance preceding label when using TreeNode() or Bullet()
function ImGui.GetTreeNodeToLabelSpacing()
    local g = GImGui
    return g.FontSize + (g.Style.FramePadding.x * 2.0)
end

--- @param storage_id ImGuiID
function ImGui.SetNextItemStorageID(storage_id)
    local g = GImGui
    if g.CurrentWindow.SkipItems then
        return
    end
    g.NextItemData.HasFlags = bit32.bor(g.NextItemData.HasFlags, ImGuiNextItemDataFlags.HasStorageID)
    g.NextItemData.StorageId = storage_id
end

-- Overloads: CollapsingHeader(label, flags?) -> is_open
--            CollapsingHeader(label, p_visible: bool, flags?) -> is_open, p_visible
--- @param label  string
function ImGui.CollapsingHeader(label, a, b)
    local p_visible, flags
    if type(a) == "boolean" then p_visible, flags = a, b else flags = a end
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false, p_visible
    end

    if p_visible == false then
        return false, p_visible
    end

    local id = window:GetID(label)
    flags = bit32.bor(flags, ImGuiTreeNodeFlags.CollapsingHeader)
    if p_visible ~= nil then
        flags = bit32.bor(flags, ImGuiTreeNodeFlags.AllowOverlap, ImGuiTreeNodeFlags.ClipLabelForTrailingButton)
    end
    local is_open = ImGui.TreeNodeBehavior(id, flags, label)
    if p_visible ~= nil then
        -- Create a small overlapping close button
        local g = GImGui
        local last_item_backup = ImGuiLastItemData()
        ImGuiLastItemData_Copy(last_item_backup, g.LastItemData)
        local button_size = g.FontSize
        local button_x = ImMax(g.LastItemData.Rect.Min.x, g.LastItemData.Rect.Max.x - g.Style.FramePadding.x - button_size)
        local button_y = g.LastItemData.Rect.Min.y + g.Style.FramePadding.y
        local close_button_id = ImGui.GetIDWithSeed("#CLOSE", nil, id)
        if ImGui.CloseButton(close_button_id, ImVec2(button_x, button_y)) then
            p_visible = false
        end
        ImGuiLastItemData_Copy(g.LastItemData, last_item_backup)
    end

    return is_open, p_visible
end

----------------------------------------------------------------
-- [SECTION] SELECTABLE
----------------------------------------------------------------
-- - Selectable()
----------------------------------------------------------------

-- Tip: pass a non-visible label (e.g. "##hello") then you can use the space to draw other text or image.
-- But you need to make sure the ID is unique, e.g. enclose calls in PushID/PopID or use ##unique_id.
-- With this scheme, ImGuiSelectableFlags_SpanAllColumns and ImGuiSelectableFlags_AllowOverlap are also frequently used flags.
-- FIXME: Selectable() with (size.x == 0.0f) and (SelectableTextAlign.x > 0.0f) followed by SameLine() is currently not supported.
--- @param label     string
--- @param selected? bool
--- @param flags?    ImGuiSelectableFlags
--- @param size_arg? any
--- @return bool is_pressed
--- @return bool is_selected # Updated `selected`
function ImGui.Selectable(label, selected, flags, size_arg)
    if selected == nil then selected = false        end
    if flags    == nil then flags    = 0            end
    if size_arg == nil then size_arg = ImVec2(0, 0) end

    local window = ImGui.GetCurrentWindow()
    if (window.SkipItems) then
        return false, selected
    end

    local g = GImGui
    local style = g.Style

    local id = window:GetID(label)
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)
    local size = ImVec2((size_arg.x ~= 0.0) and size_arg.x or label_size.x, (size_arg.y ~= 0.0) and size_arg.y or label_size.y)

    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)
    pos.y = pos.y + window.DC.CurrLineTextBaseOffset

    ImGui.ItemSize(size, 0.0)

    -- Fill horizontal space
    -- We don't support (size < 0.0) in Selectable() because the ItemSpacing extension would make explicitly right-aligned sizes not visibly match other widgets.
    local span_all_columns = bit32.band(flags, ImGuiSelectableFlags.SpanAllColumns) ~= 0
    local min_x = span_all_columns and window.ParentWorkRect.Min.x or pos.x
    local max_x = span_all_columns and window.ParentWorkRect.Max.x or window.WorkRect.Max.x
    if size_arg.x == 0.0 or bit32.band(flags, ImGuiSelectableFlags.SpanAvailWidth) ~= 0 then
        size.x = ImMax(label_size.x, max_x - min_x)
    end

    -- Selectables are meant to be tightly packed together with no click-gap, so we extend their box to cover spacing between selectable.
    -- FIXME: Not part of layout so not included in clipper calculation, but ItemSize currently doesn't allow offsetting CursorPos.
    local bb = ImRect(min_x, pos.y, min_x + size.x, pos.y + size.y)
    if bit32.band(flags, ImGuiSelectableFlags.NoPadWithHalfSpacing) == 0 then
        local spacing_x = span_all_columns and 0.0 or style.ItemSpacing.x
        local spacing_y = style.ItemSpacing.y
        local spacing_L = IM_TRUNC(spacing_x * 0.50)
        local spacing_U = IM_TRUNC(spacing_y * 0.50)

        bb.Min.x = bb.Min.x - spacing_L
        bb.Min.y = bb.Min.y - spacing_U
        bb.Max.x = bb.Max.x + (spacing_x - spacing_L)
        bb.Max.y = bb.Max.y + (spacing_y - spacing_U)
    end

    local disabled_item = bit32.band(flags, ImGuiSelectableFlags.Disabled) ~= 0
    local extra_item_flags = disabled_item and ImGuiItemFlags.Disabled or ImGuiItemFlags.None

    local is_visible
    if span_all_columns then
        -- Modify ClipRect for the ItemAdd(), faster than doing a PushColumnsBackground/PushTableBackgroundChannel for every Selectable..
        local backup_clip_rect_min_x = window.ClipRect.Min.x
        local backup_clip_rect_max_x = window.ClipRect.Max.x

        window.ClipRect.Min.x = window.ParentWorkRect.Min.x
        window.ClipRect.Max.x = window.ParentWorkRect.Max.x

        is_visible = ImGui.ItemAdd(bb, id, nil, extra_item_flags)

        window.ClipRect.Min.x = backup_clip_rect_min_x
        window.ClipRect.Max.x = backup_clip_rect_max_x
    else
        is_visible = ImGui.ItemAdd(bb, id, nil, extra_item_flags)
    end

    local is_multi_select = bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.IsMultiSelect) ~= 0

    if not is_visible then
        if not is_multi_select or not g.BoxSelectState.UnclipMode or not g.BoxSelectState.UnclipRect:Overlaps(bb) then
            -- Extra layer of "no logic clip" for box-select support (would be more overhead to add to ItemAdd)
            return false, selected
        end
    end

    local disabled_global = bit32.band(g.CurrentItemFlags, ImGuiItemFlags.Disabled) ~= 0

    if disabled_item and not disabled_global then
        -- Only testing this as an optimization
        ImGui.BeginDisabled()
    end

    -- FIXME: We can standardize the behavior of those two, we could also keep the fast path of override ClipRect + full push on render only,
    -- which would be advantageous since most selectable are not selected.
    if span_all_columns then
        if g.CurrentTable then
            ImGui.TablePushBackgroundChannel()
        elseif window.DC.CurrentColumns then
            ImGui.PushColumnsBackground()
        end

        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HasClipRect)
        ImRect_Copy(g.LastItemData.ClipRect, window.ClipRect)
    end

    -- We use NoHoldingActiveID on menus so user can click and _hold_ on a menu then drag to browse child entries
    local button_flags = 0
    if bit32.band(flags, ImGuiSelectableFlags.NoHoldingActiveID) ~= 0 then button_flags = bit32.bor(button_flags, ImGuiButtonFlags.NoHoldingActiveId) end
    if bit32.band(flags, ImGuiSelectableFlags.NoSetKeyOwner)     ~= 0 then button_flags = bit32.bor(button_flags, ImGuiButtonFlags.NoSetKeyOwner) end
    if bit32.band(flags, ImGuiSelectableFlags.SelectOnClick)     ~= 0 then button_flags = bit32.bor(button_flags, ImGuiButtonFlags.PressedOnClick) end
    if bit32.band(flags, ImGuiSelectableFlags.SelectOnRelease)   ~= 0 then button_flags = bit32.bor(button_flags, ImGuiButtonFlags.PressedOnRelease) end
    if bit32.band(flags, ImGuiSelectableFlags.AllowDoubleClick)  ~= 0 then button_flags = bit32.bor(button_flags, ImGuiButtonFlags.PressedOnClickRelease, ImGuiButtonFlags.PressedOnDoubleClick) end
    if bit32.band(flags, ImGuiSelectableFlags.AllowOverlap) ~= 0 or bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.AllowOverlap) ~= 0 then button_flags = bit32.bor(button_flags, ImGuiButtonFlags.AllowOverlap) end

    -- Multi-selection support (header)
    local was_selected = selected
    if is_multi_select then
        -- Handle multi-select + alter button flags for it
        -- TODO: selected, button_flags = ImGui.MultiSelectItemHeader(id, selected, button_flags)
    end

    local pressed, hovered, held = ImGui.ButtonBehavior(bb, id, button_flags)
    local auto_selected = false

    -- Multi-selection support (footer)
    if is_multi_select then
        -- TODO: selected, pressed = ImGui.MultiSelectItemFooter(id, selected, pressed)
    else
        -- Auto-select when moved into
        -- - This will be more fully fleshed in the range-select branch
        -- - This is not exposed as it won't nicely work with some user side handling of shift/control
        -- - We cannot do 'if (g.NavJustMovedToId != id) { selected = false; pressed = was_selected; }' for two reasons
        --   - (1) it would require focus scope to be set, need exposing PushFocusScope() or equivalent (e.g. BeginSelection() calling PushFocusScope())
        --   - (2) usage will fail with clipped items
        --   The multi-select API aim to fix those issues, e.g. may be replaced with a BeginSelection() API.
        if bit32.band(flags, ImGuiSelectableFlags.SelectOnNav) ~= 0 and g.NavJustMovedToId ~= 0 and g.NavJustMovedToFocusScopeId == g.CurrentFocusScopeId then
            if g.NavJustMovedToId == id and bit32.band(g.NavJustMovedToKeyMods, ImGuiMod_Ctrl) == 0 then
                selected = true
                pressed = true
                auto_selected = true
            end
        end
    end

    -- Update NavId when clicking or when Hovering (this doesn't happen on most widgets), so navigation can be resumed with keyboard/gamepad
    if pressed or (hovered and bit32.band(flags, ImGuiSelectableFlags.SetNavIdOnHover) ~= 0) then
        if not g.NavHighlightItemUnderNav and g.NavWindow == window and g.NavLayer == window.DC.NavLayerCurrent then
            ImGui.SetNavID(id, window.DC.NavLayerCurrent, g.CurrentFocusScopeId, ImGui.WindowRectAbsToRel(window, bb))  -- (bb == NavRect)
            if g.IO.ConfigNavCursorVisibleAuto then
                g.NavCursorVisible = false
            end
        end
    end
    if pressed then
        ImGui.MarkItemEdited(id)
    end

    if selected ~= was_selected then
        g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.ToggledSelection)
    end
    if g.ActiveId == id and g.ActiveIdIsJustActivated then
        g.ActiveIdWasSelected = was_selected
        g.ActiveIdWasSoleSelected = was_selected and (not is_multi_select or g.CurrentMultiSelect.IsSoleOrUnknownSelectionSize)
    end

    -- Render
    if is_visible then
        local highlighted = hovered or (bit32.band(flags, ImGuiSelectableFlags.Highlight) ~= 0)

        if highlighted or selected then
            -- Between 1.91.0 and 1.91.4 we made selected Selectable use an arbitrary lerp between _Header and _HeaderHovered. Removed that now. (#8106)
            local col
            if held and highlighted then
                col = ImGui.GetColorU32(ImGuiCol.HeaderActive)
            elseif highlighted then
                col = ImGui.GetColorU32(ImGuiCol.HeaderHovered)
            else
                col = ImGui.GetColorU32(ImGuiCol.Header)
            end
            ImGui.RenderFrame(bb.Min, bb.Max, col, false, style.SelectableRounding)
        end

        if g.NavId == id then
            local nav_render_cursor_flags = ImGuiNavRenderCursorFlags.Compact
            if is_multi_select then
                nav_render_cursor_flags = bit32.bor(nav_render_cursor_flags, ImGuiNavRenderCursorFlags.AlwaysDraw) -- Always show the nav rectangle
            end
            ImGui.RenderNavCursor(bb, id, nav_render_cursor_flags, style.SelectableRounding)
        end
    end

    if span_all_columns then
        if g.CurrentTable then
            ImGui.TablePopBackgroundChannel()
        elseif window.DC.CurrentColumns then
            ImGui.PopColumnsBackground()
        end
    end

    -- Text stays at the submission position. Alignment/clipping extents ignore SpanAllColumns.
    if is_visible then
        ImGui.RenderTextClipped(pos, ImVec2(ImMin(pos.x + size.x, window.WorkRect.Max.x), pos.y + size.y), label, label_end, label_size, style.SelectableTextAlign, bb)
    end

    -- Automatically close popups
    if pressed and not auto_selected and bit32.band(window.Flags, ImGuiWindowFlags.Popup) ~= 0 and bit32.band(flags, ImGuiSelectableFlags.NoAutoClosePopups) == 0 and bit32.band(g.LastItemData.ItemFlags, ImGuiItemFlags.AutoClosePopups) ~= 0 then
        ImGui.CloseCurrentPopup()
    end

    if disabled_item and not disabled_global then
        ImGui.EndDisabled()
    end

    -- Users of BeginMultiSelect()/EndMultiSelect() scope: you may call ImGui::IsItemToggledSelection() to retrieve
    -- selection toggle, only useful if you need that state updated (e.g. for rendering purpose) before reaching EndMultiSelect().
    return pressed, selected
end

----------------------------------------------------------------
-- [SECTION] LISTBOX
----------------------------------------------------------------

--- @param label     string
--- @param size_arg? ImVec2
function ImGui.BeginListBox(label, size_arg)
    if size_arg == nil then size_arg = ImVec2(0, 0) end
    local g = GImGui
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local style = g.Style
    local id = ImGui.GetID(label)
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local size = ImTrunc(ImGui.CalcItemSize(size_arg, ImGui.CalcItemWidth(), ImGui.GetTextLineHeightWithSpacing() * 7.25 + style.FramePadding.y * 2.0))
    local frame_size = ImVec2(size.x, ImMax(size.y, label_size.y))
    local frame_bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + frame_size)
    local bb = ImRect(frame_bb.Min, frame_bb.Max + ImVec2((label_size.x > 0.0) and (style.ItemInnerSpacing.x + label_size.x) or 0.0, 0.0))
    g.NextItemData:ClearFlags()

    if not ImGui.IsRectVisible(bb.Min, bb.Max) then
        ImGui.ItemSize(bb:GetSize(), style.FramePadding.y)
        ImGui.ItemAdd(bb, 0, frame_bb)
        g.NextWindowData:ClearFlags()
        return false
    end

    ImGui.BeginGroup()
    if label_size.x > 0.0 then
        local label_pos = ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, frame_bb.Min.y + style.FramePadding.y)
        ImGui.RenderText(label_pos, label, 1, label_end, false)
        ImVec2_Copy(window.DC.CursorMaxPos, ImMax(window.DC.CursorMaxPos, label_pos + label_size))
        ImGui.AlignTextToFramePadding()
    end

    ImGui.BeginChild(id, frame_bb:GetSize(), ImGuiChildFlags.FrameStyle)
    return true
end

function ImGui.EndListBox()
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT(bit32.band(window.Flags, ImGuiWindowFlags.ChildWindow) ~= 0, "Mismatched BeginListBox/EndListBox calls. Did you test the return value of BeginListBox?")

    ImGui.EndChild()
    ImGui.EndGroup()
end

-- Overloads: (label, current_item, items[], items_count?, height_in_items?) or (label, current_item, getter, user_data, items_count, height_in_items?)
--- @param current_item int # 0-based
--- @return int  current_item
--- @return bool value_changed
function ImGui.ListBox(label, current_item, a, b, c, d)
    local g = GImGui
    local getter, user_data, items_count, height_in_items = Items_ResolveArgs(a, b, c, d)
    if height_in_items == nil then height_in_items = -1 end

    if height_in_items < 0 then
        height_in_items = ImMin(items_count, 7)
    end
    local height_in_items_f = height_in_items + 0.25
    local size = ImVec2(0.0, ImTrunc(ImGui.GetTextLineHeightWithSpacing() * height_in_items_f + g.Style.FramePadding.y * 2.0))

    if not ImGui.BeginListBox(label, size) then
        return current_item, false
    end

    local value_changed = false
    local clipper = ImGuiListClipper()
    clipper:Begin(items_count, ImGui.GetTextLineHeightWithSpacing())
    clipper:IncludeItemByIndex(current_item)
    while clipper:Step() do
        for i = clipper.DisplayStart, clipper.DisplayEnd - 1 do
            local item_text = getter(user_data, i)
            if item_text == nil then
                item_text = "*Unknown item*"
            end

            ImGui.PushID(i)
            local item_selected = (i == current_item)
            if ImGui.Selectable(item_text, item_selected) then
                current_item = i
                value_changed = true
            end
            if item_selected then
                ImGui.SetItemDefaultFocus()
            end
            ImGui.PopID()
        end
    end
    ImGui.EndListBox()

    if value_changed then
        ImGui.MarkItemEdited(g.LastItemData.ID)
    end

    return current_item, value_changed
end

----------------------------------------------------------------
-- [SECTION] BASIC PLOTTING
----------------------------------------------------------------

--- @param plot_type     ImGuiPlotType
--- @param label         string
--- @param values_getter fun(data?: table, idx: int): float
--- @param data?         table                              # 1-based table
--- @param values_count  int
--- @param values_offset int
--- @param overlay_text? string
--- @param scale_min     float
--- @param scale_max     float
--- @param size_arg      ImVec2
--- @return int
function ImGui.PlotEx(plot_type, label, values_getter, data, values_count, values_offset, overlay_text, scale_min, scale_max, size_arg)
    local g = GImGui
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return -1
    end

    local style = g.Style
    local id = window:GetID(label)

    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)
    local frame_size = ImGui.CalcItemSize(size_arg, ImGui.CalcItemWidth(), label_size.y + style.FramePadding.y * 2.0)

    local frame_bb = ImRect(window.DC.CursorPos, window.DC.CursorPos + frame_size)
    local inner_bb = ImRect(frame_bb.Min + style.FramePadding, frame_bb.Max - style.FramePadding)
    local total_bb = ImRect(frame_bb.Min, frame_bb.Max + ImVec2(label_size.x > 0.0 and style.ItemInnerSpacing.x + label_size.x or 0.0, 0))
    ImGui.ItemSize(total_bb, style.FramePadding.y)
    if not ImGui.ItemAdd(total_bb, id, frame_bb, ImGuiItemFlags.NoNav) then
        return -1
    end

    local _, hovered, _ = ImGui.ButtonBehavior(frame_bb, id)

    if scale_min == FLT_MAX or scale_max == FLT_MAX then
        local v_min = FLT_MAX
        local v_max = -FLT_MAX
        for i = 1, values_count do
            local v = values_getter(data, i) -- NaN isn't checked here

            v_min = ImMin(v_min, v)
            v_max = ImMax(v_max, v)
        end
        if scale_min == FLT_MAX then
            scale_min = v_min
        end
        if scale_max == FLT_MAX then
            scale_max = v_max
        end
    end

    ImGui.RenderFrame(frame_bb.Min, frame_bb.Max, ImGui.GetColorU32(ImGuiCol.FrameBg), true, style.FrameRounding)

    local values_count_min = (plot_type == ImGuiPlotType.Lines) and 2 or 1
    local idx_hovered = -1

    if values_count >= values_count_min then
        local res_w = ImMin(math.floor(frame_size.x), values_count) + ((plot_type == ImGuiPlotType.Lines) and -1 or 0)
        local item_count = values_count + ((plot_type == ImGuiPlotType.Lines) and -1 or 0)

        if hovered and inner_bb:Contains(g.IO.MousePos) then
            local t = ImClamp((g.IO.MousePos.x - inner_bb.Min.x) / (inner_bb.Max.x - inner_bb.Min.x), 0.0, 0.999)
            local v_idx = math.floor(t * item_count) + 1
            IM_ASSERT(v_idx >= 1 and v_idx <= values_count)

            local v0 = values_getter(data, (v_idx - 1 + values_offset) % values_count + 1)
            local v1 = values_getter(data, (v_idx - 1 + 1 + values_offset) % values_count + 1)
            if plot_type == ImGuiPlotType.Lines then
                ImGui.SetTooltip("%d: %8.4g\n%d: %8.4g", v_idx, v0, v_idx + 1, v1)
            elseif plot_type == ImGuiPlotType.Histogram then
                ImGui.SetTooltip("%d: %8.4g", v_idx, v0)
            end
            idx_hovered = v_idx
        end

        local t_step = 1.0 / res_w
        local inv_scale = (scale_min == scale_max) and 0.0 or (1.0 / (scale_max - scale_min))

        local v0 = values_getter(data, (0 + values_offset) % values_count + 1)
        local t0 = 0.0
        local tp0 = ImVec2(t0, 1.0 - ImSaturate((v0 - scale_min) * inv_scale))
        local histogram_zero_line_t = (scale_min * scale_max < 0.0) and (1 + scale_min * inv_scale) or (scale_min < 0.0 and 0.0 or 1.0)

        local col_base = ImGui.GetColorU32((plot_type == ImGuiPlotType.Lines) and ImGuiCol.PlotLines or ImGuiCol.PlotHistogram)
        local col_hovered = ImGui.GetColorU32((plot_type == ImGuiPlotType.Lines) and ImGuiCol.PlotLinesHovered or ImGuiCol.PlotHistogramHovered)

        for _ = 0, res_w - 1 do
            local t1 = t0 + t_step
            local v1_idx = math.floor(t0 * item_count + 0.5) + 1
            IM_ASSERT(v1_idx >= 1 and v1_idx <= values_count)
            local v1 = values_getter(data, (v1_idx - 1 + values_offset + 1) % values_count + 1)
            local tp1 = ImVec2(t1, 1.0 - ImSaturate((v1 - scale_min) * inv_scale))

            local pos0 = ImLerp(inner_bb.Min, inner_bb.Max, tp0)
            local pos1
            if plot_type == ImGuiPlotType.Lines then
                pos1 = ImLerp(inner_bb.Min, inner_bb.Max, tp1)
            else
                pos1 = ImLerp(inner_bb.Min, inner_bb.Max, ImVec2(tp1.x, histogram_zero_line_t))
            end

            if plot_type == ImGuiPlotType.Lines then
                window.DrawList:AddLine(pos0, pos1, idx_hovered == v1_idx and col_hovered or col_base)
            elseif plot_type == ImGuiPlotType.Histogram then
                if pos1.x >= pos0.x + 2.0 then
                    pos1.x = pos1.x - 1.0
                end
                window.DrawList:AddRectFilled(pos0, pos1, idx_hovered == v1_idx and col_hovered or col_base)
            end

            t0 = t1
            tp0 = tp1
        end
    end

    if overlay_text then
        ImGui.RenderTextClipped(ImVec2(frame_bb.Min.x, frame_bb.Min.y + style.FramePadding.y), frame_bb.Max, overlay_text, nil, nil, ImVec2(0.5, 0.0))
    end

    if label_size.x > 0.0 then
        ImGui.RenderText(ImVec2(frame_bb.Max.x + style.ItemInnerSpacing.x, inner_bb.Min.y), label, 1, label_end, false)
    end

    return idx_hovered
end

--- @class ImGuiPlotArrayGetterData
--- @field Values float[]
--- @field Stride int

--- @param values float[]
--- @param stride int
--- @return ImGuiPlotArrayGetterData
--- @nodiscard
function ImGuiPlotArrayGetterData(values, stride)
    return {
        Values = values,
        Stride = stride
    }
end

--- @param data ImGuiPlotArrayGetterData
--- @param idx int
--- @return float
--- @package
local function Plot_ArrayGetter(data, idx)
    return data.Values[idx * data.Stride]
end

--- @param label            string
--- @param values_or_getter table|fun(data:table, i:int)  # 1-based table or a function
--- @param data?            table                         # 1-based table
--- @param values_count     int
--- @param values_offset?   int                           # Defaults to 0
--- @param overlay_text?    string
--- @param scale_min?       float                         # Defaults to FLT_MAX
--- @param scale_max?       float                         # Defaults to FLT_MAX
--- @param graph_size?      ImVec2                        # Defaults to ImVec2(0, 0)
--- @param stride?          int                           # Defaults to 1
function ImGui.PlotLines(label, values_or_getter, data, values_count, values_offset, overlay_text, scale_min, scale_max, graph_size, stride)
    if values_offset == nil then values_offset = 0         end
    if scale_min     == nil then scale_min  = FLT_MAX      end
    if scale_max     == nil then scale_max  = FLT_MAX      end
    if graph_size    == nil then graph_size = ImVec2(0, 0) end
    if stride        == nil then stride     = 1            end

    if type(values_or_getter) == "function" then
        ImGui.PlotEx(ImGuiPlotType.Lines, label, values_or_getter, data, values_count, values_offset, overlay_text, scale_min, scale_max, graph_size)
    else
        data = ImGuiPlotArrayGetterData(values_or_getter, stride)
        ImGui.PlotEx(ImGuiPlotType.Lines, label, Plot_ArrayGetter, data, values_count, values_offset, overlay_text, scale_min, scale_max, graph_size)
    end
end

--- @param label            string
--- @param values_or_getter table|fun(data:table, i:int)  # 1-based table or a function
--- @param data?            table                         # 1-based table
--- @param values_count     int
--- @param values_offset?   int                           # Defaults to 0
--- @param overlay_text?    string
--- @param scale_min?       float                         # Defaults to FLT_MAX
--- @param scale_max?       float                         # Defaults to FLT_MAX
--- @param graph_size?      ImVec2                        # Defaults to ImVec2(0, 0)
--- @param stride?          int                           # Defaults to 1
function ImGui.PlotHistogram(label, values_or_getter, data, values_count, values_offset, overlay_text, scale_min, scale_max, graph_size, stride)
    if values_offset == nil then values_offset = 0         end
    if scale_min     == nil then scale_min  = FLT_MAX      end
    if scale_max     == nil then scale_max  = FLT_MAX      end
    if graph_size    == nil then graph_size = ImVec2(0, 0) end
    if stride        == nil then stride     = 1            end

    if type(values_or_getter) == "function" then
        ImGui.PlotEx(ImGuiPlotType.Histogram, label, values_or_getter, data, values_count, values_offset, overlay_text, scale_min, scale_max, graph_size)
    else
        data = ImGuiPlotArrayGetterData(values_or_getter, stride)
        ImGui.PlotEx(ImGuiPlotType.Histogram, label, Plot_ArrayGetter, data, values_count, values_offset, overlay_text, scale_min, scale_max, graph_size)
    end
end

----------------------------------------------------------------
-- [SECTION] MENU RELATED
----------------------------------------------------------------

--- @param spacing            float
--- @param window_reappearing bool
function MT.ImGuiMenuColumns:Update(spacing, window_reappearing)
    if window_reappearing then
        for i = 1, #self.Widths do self.Widths[i] = 0 end
    end
    self.Spacing = spacing
    self:CalcNextTotalWidth(true)
    for i = 1, #self.Widths do self.Widths[i] = 0 end
    self.TotalWidth = self.NextTotalWidth
    self.NextTotalWidth = 0
end

--- @param update_offsets bool
function MT.ImGuiMenuColumns:CalcNextTotalWidth(update_offsets)
    local offset = 0
    local want_spacing = false
    for i = 1, #self.Widths do
        local width = self.Widths[i]
        if want_spacing and width > 0 then
            offset = offset + self.Spacing
        end
        want_spacing = want_spacing or (width > 0)
        if update_offsets then
            if i == 2 then self.OffsetLabel = offset end
            if i == 3 then self.OffsetShortcut = offset end
            if i == 4 then self.OffsetMark = offset end
        end
        offset = offset + width
    end
    self.NextTotalWidth = offset
end

--- @param w_icon     float
--- @param w_label    float
--- @param w_shortcut float
--- @param w_mark     float
function MT.ImGuiMenuColumns:DeclColumns(w_icon, w_label, w_shortcut, w_mark)
    self.Widths[1] = ImMax(self.Widths[1], (ImU16)(w_icon))
    self.Widths[2] = ImMax(self.Widths[2], (ImU16)(w_label))
    self.Widths[3] = ImMax(self.Widths[3], (ImU16)(w_shortcut))
    self.Widths[4] = ImMax(self.Widths[4], (ImU16)(w_mark))
    self:CalcNextTotalWidth(false)
    return ImMax(self.TotalWidth, self.NextTotalWidth)
end

-- FIXME: Provided a rectangle perhaps e.g. a BeginMenuBarEx() could be used anywhere..
-- Currently the main responsibility of this function being to setup clip-rect + horizontal layout + menu navigation layer.
-- Ideally we also want this to be responsible for claiming space out of the main window scrolling rectangle, in which case ImGuiWindowFlags.MenuBar will become unnecessary.
-- Then later the same system could be used for multiple menu-bars, scrollbars, side-bars.
function ImGui.BeginMenuBar()
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end
    if bit32.band(window.Flags, ImGuiWindowFlags.MenuBar) == 0 then
        return false
    end

    IM_ASSERT(not window.DC.MenuBarAppending)
    ImGui.BeginGroup() -- FIXME: Misleading to use a group for that backup/restore
    ImGui.PushID("##MenuBar")

    -- We don't clip with current window clipping rectangle as it is already set to the area below. However we clip with window full rect.
    -- We remove 1 worth of rounding to Max.x to that text in long menus and small windows don't tend to display over the lower-right rounded area, which looks particularly glitchy.
    local border_top = ImMax(IM_ROUND(window.WindowBorderSize * 0.5 - window.TitleBarHeight), 0.0)
    local border_half = IM_ROUND(window.WindowBorderSize * 0.5)
    local bar_rect = window:MenuBarRect()
    local clip_rect = ImRect(ImFloor(bar_rect.Min.x + border_half), ImFloor(bar_rect.Min.y + border_top), ImFloor(ImMax(bar_rect.Min.x, bar_rect.Max.x - ImMax(window.WindowRounding, border_half))), ImFloor(bar_rect.Max.y))
    clip_rect:ClipWith(window.OuterRectClipped)
    ImGui.PushClipRect(clip_rect.Min, clip_rect.Max, false)

    -- We overwrite CursorMaxPos because BeginGroup sets it to CursorPos (essentially the .EmitItem hack in EndMenuBar() would need something analogous here, maybe a BeginGroupEx() with flags)
    ImVec2_Copy(window.DC.CursorPos, ImVec2(bar_rect.Min.x + window.DC.MenuBarOffset.x, bar_rect.Min.y + window.DC.MenuBarOffset.y))
    ImVec2_Copy(window.DC.CursorMaxPos, window.DC.CursorPos)
    window.DC.LayoutType = ImGuiLayoutType.Horizontal
    window.DC.IsSameLine = false
    window.DC.NavLayerCurrent = ImGuiNavLayer.Menu
    window.DC.MenuBarAppending = true
    ImGui.AlignTextToFramePadding()

    return true
end

function ImGui.EndMenuBar()
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end
    local g = GImGui

    IM_ASSERT(bit32.band(window.Flags, ImGuiWindowFlags.MenuBar) ~= 0)
    IM_ASSERT(window.DC.MenuBarAppending)

    -- Nav: When a move request within one of our child menu failed, capture the request to navigate among our siblings
    if ImGui.NavMoveRequestButNoResultYet() and (g.NavMoveDir == ImGuiDir.Left or g.NavMoveDir == ImGuiDir.Right) and bit32.band(g.NavWindow.Flags, ImGuiWindowFlags.ChildMenu) ~= 0 then
        local nav_earliest_child = g.NavWindow
        while nav_earliest_child.ParentWindow and bit32.band(nav_earliest_child.ParentWindow.Flags, ImGuiWindowFlags.ChildMenu) ~= 0 do
            nav_earliest_child = nav_earliest_child.ParentWindow
        end
        if nav_earliest_child.ParentWindow == window and nav_earliest_child.DC.ParentLayoutType == ImGuiLayoutType.Horizontal and bit32.band(g.NavMoveFlags, ImGuiNavMoveFlags.Forwarded) == 0 then
            local layer = ImGuiNavLayer.Menu
            IM_ASSERT(bit32.band(window.DC.NavLayersActiveMaskNext, bit32.lshift(1, layer)) ~= 0)
            ImGui.FocusWindow(window)
            ImGui.SetNavID(window.NavLastIds[layer], layer, 0, window.NavRectRel[layer])
            if g.NavCursorVisible then
                g.NavCursorVisible = false
                g.NavCursorHideFrames = 2
            end
            g.NavHighlightItemUnderNav = true
            g.NavMousePosDirty = true
            ImGui.NavMoveRequestForward(g.NavMoveDir, g.NavMoveClipDir, g.NavMoveFlags, g.NavMoveScrollFlags)
        end
    else
        ImGui.NavMoveRequestTryWrapping(window, ImGuiNavMoveFlags.WrapX)
    end

    ImGui.PopClipRect()
    ImGui.PopID()
    window.DC.MenuBarOffset.x = window.DC.CursorPos.x - window.Pos.x -- Save horizontal position so next append can reuse it. This is kinda equivalent to a per-layer CursorPos

    -- FIXME: Extremely confusing, cleanup by (a) working on WorkRect stack system (b) not using a Group confusingly here
    local group_data = g.GroupStack:back()
    group_data.EmitItem = false
    local restore_cursor_max_pos = ImVec2()
    ImVec2_Copy(restore_cursor_max_pos, group_data.BackupCursorMaxPos)
    window.DC.IdealMaxPos.x = ImMax(window.DC.IdealMaxPos.x, window.DC.CursorMaxPos.x - window.Scroll.x) -- Convert ideal extents for scrolling layer equivalent
    ImGui.EndGroup() -- Restore position on layer 0 // FIXME: Misleading to use a group for that backup/restore
    window.DC.LayoutType = ImGuiLayoutType.Vertical
    window.DC.IsSameLine = false
    window.DC.NavLayerCurrent = ImGuiNavLayer.Main
    window.DC.MenuBarAppending = false
    ImVec2_Copy(window.DC.CursorMaxPos, restore_cursor_max_pos)
end

-- Important: calling order matters!
--- @param name        string
--- @param viewport_p? ImGuiViewport
--- @param dir         ImGuiDir
--- @param axis_size   float
--- @param window_flags ImGuiWindowFlags
function ImGui.BeginViewportSideBar(name, viewport_p, dir, axis_size, window_flags)
    IM_ASSERT(dir ~= ImGuiDir.None)

    local bar_window = ImGui.FindWindowByName(name)
    local viewport = viewport_p or ImGui.GetMainViewport()
    if bar_window == nil or bar_window.BeginCount == 0 then
        local avail_rect = viewport:GetBuildWorkRect()
        local axis = (dir == ImGuiDir.Up or dir == ImGuiDir.Down) and ImGuiAxis.Y or ImGuiAxis.X
        local pos = ImVec2(avail_rect.Min.x, avail_rect.Min.y)
        if dir == ImGuiDir.Right or dir == ImGuiDir.Down then
            pos[axis] = avail_rect.Max[axis] - axis_size
        end
        local size = avail_rect:GetSize()
        size[axis] = axis_size
        ImGui.SetNextWindowPos(pos)
        ImGui.SetNextWindowSize(size)

        if dir == ImGuiDir.Up or dir == ImGuiDir.Left then
            viewport.BuildWorkInsetMin[axis] = viewport.BuildWorkInsetMin[axis] + axis_size
        elseif dir == ImGuiDir.Down or dir == ImGuiDir.Right then
            viewport.BuildWorkInsetMax[axis] = viewport.BuildWorkInsetMax[axis] + axis_size
        end
    end

    window_flags = bit32.bor(window_flags or 0, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoResize, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoDocking)
    ImGui.SetNextWindowViewport(viewport.ID)
    ImGui.PushStyleVar(ImGuiStyleVar.WindowRounding, 0.0)
    ImGui.PushStyleVar(ImGuiStyleVar.WindowMinSize, ImVec2(0, 0))
    local _, is_open = ImGui.Begin(name, nil, window_flags)
    ImGui.PopStyleVar(2)

    return is_open
end

function ImGui.BeginMainMenuBar()
    local g = GImGui
    local viewport = ImGui.GetMainViewport()

    ImGui.SetCurrentViewport(nil, viewport)

    g.NextWindowData.MenuBarOffsetMinVal = ImVec2(g.Style.DisplaySafeAreaPadding.x, ImMax(g.Style.DisplaySafeAreaPadding.y - g.Style.FramePadding.y, 0.0))
    local window_flags = bit32.bor(ImGuiWindowFlags.NoScrollbar, ImGuiWindowFlags.NoSavedSettings, ImGuiWindowFlags.MenuBar)
    local height = ImGui.GetFrameHeight()
    local is_open = ImGui.BeginViewportSideBar("##MainMenuBar", viewport, ImGuiDir.Up, height, window_flags)
    g.NextWindowData.MenuBarOffsetMinVal = ImVec2(0.0, 0.0)
    if not is_open then
        ImGui.End()
        return false
    end

    g.CurrentWindow.Flags = bit32.band(g.CurrentWindow.Flags, bit32.bnot(ImGuiWindowFlags.NoSavedSettings))
    ImGui.BeginMenuBar()
    return is_open
end

function ImGui.EndMainMenuBar()
    local g = GImGui
    IM_ASSERT_USER_ERROR_RET(g.CurrentWindow.DC.MenuBarAppending, "Calling EndMainMenuBar() not from a menu-bar!")

    ImGui.EndMenuBar()
    g.CurrentWindow.Flags = bit32.bor(g.CurrentWindow.Flags, ImGuiWindowFlags.NoSavedSettings)

    if g.CurrentWindow == g.NavWindow and g.NavLayer == ImGuiNavLayer.Main and not g.NavAnyRequest and g.ActiveId == 0 then
        ImGui.FocusTopMostWindowUnderOne(g.NavWindow, nil, nil, bit32.bor(ImGuiFocusRequestFlags.UnlessBelowModal, ImGuiFocusRequestFlags.RestoreFocusedChild))
    end

    ImGui.End()
end

local function IsRootOfOpenMenuSet()
    local g = GImGui
    local window = g.CurrentWindow
    if (g.OpenPopupStack.Size <= g.BeginPopupStack.Size) or (bit32.band(window.Flags, ImGuiWindowFlags.ChildMenu) ~= 0) then
        return false
    end

    local upper_popup = g.OpenPopupStack.Data[g.BeginPopupStack.Size + 1]
    if window.DC.NavLayerCurrent ~= upper_popup.ParentNavLayer then
        return false
    end
    return upper_popup.Window and (bit32.band(upper_popup.Window.Flags, ImGuiWindowFlags.ChildMenu) ~= 0) and ImGui.IsWindowChildOf(upper_popup.Window, window, true, false)
end

--- @param label   string
--- @param icon?   string
--- @param enabled bool
function ImGui.BeginMenuEx(label, icon, enabled)
    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local style = g.Style
    local id = window:GetID(label)
    local menu_is_open = ImGui.IsPopupOpen(id, ImGuiPopupFlags.None)

    local window_flags = bit32.bor(ImGuiWindowFlags.ChildMenu, ImGuiWindowFlags.AlwaysAutoResize, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoTitleBar, ImGuiWindowFlags.NoSavedSettings, ImGuiWindowFlags.NoNavFocus)
    if bit32.band(window.Flags, ImGuiWindowFlags.ChildMenu) ~= 0 then
        window_flags = bit32.bor(window_flags, ImGuiWindowFlags.ChildWindow)
    end

    if g.MenusIdSubmittedThisFrame:contains(id) then
        if menu_is_open then
            menu_is_open = ImGui.BeginPopupMenuEx(id, label, window_flags)
        else
            g.NextWindowData:ClearFlags()
        end
        return menu_is_open
    end

    g.MenusIdSubmittedThisFrame:push_back(id)

    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local menuset_is_open = IsRootOfOpenMenuSet()
    if menuset_is_open then
        g.NextItemData.ItemFlagsSet = bit32.bor(g.NextItemData.ItemFlagsSet, ImGuiItemFlags.NoWindowHoverableCheck)
    end

    local popup_pos
    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)
    ImGui.PushID(label)
    if not enabled then
        ImGui.BeginDisabled()
    end

    local pressed

    local backup_rounding = style.SelectableRounding
    style.SelectableRounding = style.MenuItemRounding
    local selectable_flags = bit32.bor(ImGuiSelectableFlags.SelectOnClick, ImGuiSelectableFlags.NoAutoClosePopups)
    local offsets = window.DC.MenuColumns
    if window.DC.LayoutType == ImGuiLayoutType.Horizontal then
        window.DC.CursorPos.x = window.DC.CursorPos.x + IM_TRUNC(style.ItemSpacing.x * 0.5)
        ImGui.PushStyleVarX(ImGuiStyleVar.ItemSpacing, style.ItemSpacing.x * 2.0)
        local text_pos = ImVec2(window.DC.CursorPos.x + offsets.OffsetLabel, pos.y + window.DC.CurrLineTextBaseOffset)
        pressed = ImGui.Selectable("", menu_is_open, selectable_flags, label_size)
        -- TODO: ImGui.LogSetNextTextDecoration("[", "]")
        ImGui.RenderText(text_pos, label, 1, label_end, false)
        ImGui.PopStyleVar()
        window.DC.CursorPos.x = window.DC.CursorPos.x + IM_TRUNC(style.ItemSpacing.x * (-1.0 + 0.5))
        popup_pos = ImVec2(pos.x - 1.0 - IM_TRUNC(style.ItemSpacing.x * 0.5), text_pos.y - style.FramePadding.y + window.MenuBarHeight)
    else
        local icon_w
        if (icon and icon ~= "") then icon_w = ImGui.CalcTextSize(icon, nil).x else icon_w = 0.0 end
        local checkmark_w = IM_TRUNC(g.FontSize * 1.20)
        local min_w = offsets:DeclColumns(icon_w, label_size.x, 0.0, checkmark_w)
        local extra_w = ImMax(0.0, ImGui.GetContentRegionAvail().x - min_w)
        local text_pos = ImVec2(window.DC.CursorPos.x, pos.y + window.DC.CurrLineTextBaseOffset)
        pressed = ImGui.Selectable("", menu_is_open, bit32.bor(selectable_flags, ImGuiSelectableFlags.SpanAvailWidth), ImVec2(min_w, label_size.y))
        -- ImGui.LogSetNextTextDecoration("", ">")
        ImGui.RenderText(ImVec2(text_pos.x + offsets.OffsetLabel, text_pos.y), label, 1, label_end, false)
        if icon_w > 0.0 then
            --- @cast icon string
            ImGui.RenderText(ImVec2(text_pos.x + offsets.OffsetIcon, text_pos.y), icon)
        end
        ImGui.RenderArrow(window.DrawList, ImVec2(text_pos.x + offsets.OffsetMark + extra_w + g.FontSize * 0.30, text_pos.y), ImGui.GetColorU32(ImGuiCol.Text), ImGuiDir.Right)
        popup_pos = ImVec2(pos.x, text_pos.y - style.WindowPadding.y)
    end
    style.SelectableRounding = backup_rounding

    if not enabled then
        ImGui.EndDisabled()
    end

    if g.ActiveId == id and g.HoveredId ~= id and g.ActiveIdSource == ImGuiInputSource.Mouse and ImGui.IsMouseDragging(0) then
        ImGui.ClearActiveID()
        ImGui.SetKeyOwner(ImGuiKey.MouseLeft, ImGuiKeyOwner_NoOwner)
    end

    local hovered = g.HoveredId == id and enabled and not g.NavHighlightItemUnderNav

    local want_open = false
    local want_open_nav_init = false
    local want_close = false
    if window.DC.LayoutType == ImGuiLayoutType.Vertical then
        local moving_toward_child_menu = false
        local child_popup = (g.BeginPopupStack.Size < g.OpenPopupStack.Size) and g.OpenPopupStack[g.BeginPopupStack.Size + 1] or nil
        local child_menu_window = (child_popup and child_popup.Window and child_popup.Window.ParentWindow == window) and child_popup.Window or nil
        if g.HoveredWindow == window and child_menu_window ~= nil then
            local ref_unit = g.FontSize
            local child_dir = (window.Pos.x < child_menu_window.Pos.x) and 1.0 or -1.0
            local next_window_rect = child_menu_window:Rect()
            local ta = (g.IO.MousePos - g.IO.MouseDelta)
            local tb
            local tc
            if child_dir > 0.0 then
                tb = next_window_rect:GetTL()
                tc = next_window_rect:GetBL()
            else
                tb = next_window_rect:GetTR()
                tc = next_window_rect:GetBR()
            end
            local pad_farmost_h = ImClamp(ImFabs(ta.x - tb.x) * 0.30, ref_unit * 0.5, ref_unit * 2.5)
            ta.x = ta.x + child_dir * -0.5
            tb.x = tb.x + child_dir * ref_unit
            tc.x = tc.x + child_dir * ref_unit
            tb.y = ta.y + ImMax((tb.y - pad_farmost_h) - ta.y, -ref_unit * 8.0)
            tc.y = ta.y + ImMin((tc.y + pad_farmost_h) - ta.y, ref_unit * 8.0)
            moving_toward_child_menu = ImStd.ImTriangleContainsPoint(ta, tb, tc, g.IO.MousePos)
        end

        if menu_is_open and not hovered and g.HoveredWindow == window and not moving_toward_child_menu and not g.NavHighlightItemUnderNav and g.ActiveId == 0 then
            want_close = true
        end

        if not menu_is_open and pressed then
            want_open = true
        elseif not menu_is_open and hovered and not moving_toward_child_menu then
            want_open = true
        elseif not menu_is_open and hovered and g.HoveredIdTimer >= 0.30 and g.MouseStationaryTimer >= 0.30 then
            want_open = true
        end
        if g.NavId == id and g.NavMoveDir == ImGuiDir.Right then
            want_open = true
            want_open_nav_init = true
            ImGui.NavMoveRequestCancel()
            ImGui.SetNavCursorVisibleAfterMove()
        end
    else
        if menu_is_open and pressed and menuset_is_open then
            want_close = true
            want_open = false
            menu_is_open = false
        elseif pressed or (hovered and menuset_is_open and not menu_is_open) then
            want_open = true
        elseif g.NavId == id and g.NavMoveDir == ImGuiDir.Down then
            want_open = true
            ImGui.NavMoveRequestCancel()
        end
    end

    if not enabled then
        want_close = true
    end
    if want_close and ImGui.IsPopupOpen(id, ImGuiPopupFlags.None) then
        ImGui.ClosePopupToLevel(g.BeginPopupStack.Size, true)
    end

    -- IMGUI_TEST_ENGINE_ITEM_INFO(id, label, g.LastItemData.StatusFlags | ImGuiItemStatusFlags_Openable | (menu_is_open ? ImGuiItemStatusFlags_Opened : 0))
    ImGui.PopID()

    if g.ActiveId == id and want_open then
        g.ActiveIdNoClearOnFocusLoss = true
    end

    if want_open and not menu_is_open and g.OpenPopupStack.Size > g.BeginPopupStack.Size then
        ImGui.OpenPopup(label)
    elseif want_open then
        menu_is_open = true
        ImGui.OpenPopup(label, ImGuiPopupFlags.NoReopen)
    end

    if menu_is_open then
        local last_item_in_parent = ImGuiLastItemData()
        ImGuiLastItemData_Copy(last_item_in_parent, g.LastItemData)

        ImGui.SetNextWindowPos(popup_pos, ImGuiCond.Always)
        ImGui.PushStyleVar(ImGuiStyleVar.ChildRounding, style.PopupRounding)
        menu_is_open = ImGui.BeginPopupMenuEx(id, label, window_flags)
        ImGui.PopStyleVar()
        if menu_is_open then
            if want_open and want_open_nav_init and not g.NavInitRequest then
                ImGui.FocusWindow(g.CurrentWindow, ImGuiFocusRequestFlags.UnlessBelowModal)
                ImGui.NavInitWindow(g.CurrentWindow, false)
            end
            ImGuiLastItemData_Copy(g.LastItemData, last_item_in_parent)
            if g.HoveredWindow == window then
                g.LastItemData.StatusFlags = bit32.bor(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.HoveredWindow)
            end
        end
    else
        g.NextWindowData:ClearFlags()
    end

    return menu_is_open
end

--- @param label    string
--- @param enabled? bool
function ImGui.BeginMenu(label, enabled)
    if enabled == nil then enabled = true end

    return ImGui.BeginMenuEx(label, nil, enabled)
end

function ImGui.EndMenu()
    local g = GImGui
    local window = g.CurrentWindow
    IM_ASSERT_USER_ERROR_RET(bit32.band(window.Flags, bit32.bor(ImGuiWindowFlags.Popup, ImGuiWindowFlags.ChildMenu)) == bit32.bor(ImGuiWindowFlags.Popup, ImGuiWindowFlags.ChildMenu), "Calling EndMenu() in wrong window!")

    local parent_window = window.ParentWindow
    if window.BeginCount == window.BeginCountPreviousFrame then
        if g.NavMoveDir == ImGuiDir.Left and ImGui.NavMoveRequestButNoResultYet() then
            if g.NavWindow and g.NavWindow.RootWindowForNav == window and parent_window.DC.LayoutType == ImGuiLayoutType.Vertical then
                ImGui.ClosePopupToLevel(g.BeginPopupStack.Size - 1, true)
                ImGui.NavMoveRequestCancel()
            end
        end
    end

    ImGui.EndPopup()
end

--- @param label     string
--- @param icon?     string
--- @param shortcut? string
--- @param selected? bool
--- @param enabled?  bool
function ImGui.MenuItemEx(label, icon, shortcut, selected, enabled)
    if selected == nil then selected = false end
    if enabled  == nil then enabled  = true  end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end

    local g = GImGui
    local style = g.Style
    local pos = ImVec2()
    ImVec2_Copy(pos, window.DC.CursorPos)
    local label_end = ImGui.FindRenderedTextEnd(label)
    local label_size = ImGui.CalcTextSize(label, label_end, false)

    local menuset_is_open = IsRootOfOpenMenuSet()
    if menuset_is_open then
        g.NextItemData.ItemFlagsSet = bit32.bor(g.NextItemData.ItemFlagsSet, ImGuiItemFlags.NoWindowHoverableCheck)
    end

    ImGui.PushID(label)
    if not enabled then
        ImGui.BeginDisabled()
    end

    local pressed

    local backup_rounding = style.SelectableRounding
    style.SelectableRounding = style.MenuItemRounding
    local selectable_flags = bit32.bor(ImGuiSelectableFlags.SelectOnRelease, ImGuiSelectableFlags.SetNavIdOnHover)
    local offsets = window.DC.MenuColumns
    if window.DC.LayoutType == ImGuiLayoutType.Horizontal then
        window.DC.CursorPos.x = window.DC.CursorPos.x + IM_TRUNC(style.ItemSpacing.x * 0.5)
        local text_pos = ImVec2(window.DC.CursorPos.x + offsets.OffsetLabel, window.DC.CursorPos.y + window.DC.CurrLineTextBaseOffset)
        ImGui.PushStyleVarX(ImGuiStyleVar.ItemSpacing, style.ItemSpacing.x * 2.0)
        pressed = ImGui.Selectable("", selected, selectable_flags, ImVec2(label_size.x, 0.0))
        ImGui.PopStyleVar()
        if bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Visible) ~= 0 then
            ImGui.RenderText(text_pos, label, 1, label_end, false)
        end
        window.DC.CursorPos.x = window.DC.CursorPos.x + IM_TRUNC(style.ItemSpacing.x * (-1.0 + 0.5))
    else
        local icon_w = 0.0
        if icon and icon ~= "" then
            icon_w = ImGui.CalcTextSize(icon, nil).x
        end
        local shortcut_w = 0.0
        if shortcut and shortcut ~= "" then
            shortcut_w = ImGui.CalcTextSize(shortcut, nil).x
        end
        local checkmark_w = IM_TRUNC(g.FontSize * 1.20)
        local min_w = offsets:DeclColumns(icon_w, label_size.x, shortcut_w, checkmark_w)
        local stretch_w = ImMax(0.0, ImGui.GetContentRegionAvail().x - min_w)
        local text_pos = ImVec2(pos.x, pos.y + window.DC.CurrLineTextBaseOffset)
        pressed = ImGui.Selectable("", false, bit32.bor(selectable_flags, ImGuiSelectableFlags.SpanAvailWidth), ImVec2(min_w, label_size.y))
        if bit32.band(g.LastItemData.StatusFlags, ImGuiItemStatusFlags.Visible) ~= 0 then
            ImGui.RenderText(text_pos + ImVec2(offsets.OffsetLabel, 0.0), label, 1, label_end, false)
            if icon_w > 0.0 then
                --- @cast icon string
                ImGui.RenderText(text_pos + ImVec2(offsets.OffsetIcon, 0.0), icon)
            end
            if shortcut_w > 0.0 then
                ImGui.PushStyleColor(ImGuiCol.Text, style.Colors[ImGuiCol.TextDisabled])
                -- ImGui.LogSetNextTextDecoration("(", ")")
                --- @cast shortcut string
                ImGui.RenderText(text_pos + ImVec2(offsets.OffsetShortcut + stretch_w, 0.0), shortcut, nil, nil, false)
                ImGui.PopStyleColor()
            end
            if selected then
                ImGui.RenderCheckMark(window.DrawList, text_pos + ImVec2(offsets.OffsetMark + stretch_w + g.FontSize * 0.40, g.FontSize * 0.134 * 0.5), ImGui.GetColorU32(ImGuiCol.Text), g.FontSize * 0.866)
            end
        end
    end
    style.SelectableRounding = backup_rounding

    local id = g.LastItemData.ID
    if g.ActiveId == id and g.HoveredId ~= id and g.ActiveIdSource == ImGuiInputSource.Mouse and ImGui.IsMouseDragging(0) then
        ImGui.ClearActiveID()
        ImGui.SetKeyOwner(ImGuiKey.MouseLeft, ImGuiKeyOwner_NoOwner)
    end

    -- IMGUI_TEST_ENGINE_ITEM_INFO()

    if not enabled then
        ImGui.EndDisabled()
    end
    ImGui.PopID()

    return pressed
end

--- @param label     string
--- @param shortcut? string
--- @param selected? bool
--- @param enabled?  bool
function ImGui.MenuItem(label, shortcut, selected, enabled)
    if ImGui.MenuItemEx(label, nil, shortcut, selected, enabled) then
        if selected ~= nil then
            selected = not selected
        end

        return true, selected
    end

    return false, selected
end


return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imstb_rectpack.lua'] = function()
--- ImGui Sincerely
-- This is a Lua port of original `imstb_rectpack.h`

-- ALL TABLES IN THIS FILE ARE 1-BASED!
-- Avoids table creation when possible

--- The `prev_link` can be stbrp_context or stbrp_node
--- @diagnostic disable

local bit32 = bit32

local STBRP_SORT = table.sort
local STBRP_ASSERT = assert
local STBRP__NOTUSED = function(_) end

local STBRP__MAXVAL = 0x7fffffff

--- @enum STBRP_HEURISTIC_Skyline
local STBRP_HEURISTIC_Skyline = {
    default = 0,
    BL_sortHeight = 0,
    BF_sortHeight = 1
}

local STBRP__INIT_skyline = 1

--- @enum STBRP__PREV_LINK_TYPE
local STBRP__PREV_LINK_TYPE = {
    ACTIVE_HEAD = 0,
    NEXT = 1
}

--- @alias stbrp_coord int

--- @class stbrp_rect
--- @field id         int
--- @field w          stbrp_coord
--- @field h          stbrp_coord
--- @field x          stbrp_coord
--- @field y          stbrp_coord
--- @field was_packed int

--- @return stbrp_rect
--- @nodiscard
local function stbrp_rect()
    return {
        id         = 0,
        w          = 0,
        h          = 0,
        x          = 0,
        y          = 0,
        was_packed = 0
    }
end

--- @class stbrp_node
--- @field x    stbrp_coord
--- @field y    stbrp_coord
--- @field next stbrp_node

--- @return stbrp_node
--- @nodiscard
local function stbrp_node()
    return {
        x    = 0,
        y    = 0,
        next = nil
    }
end

--- @class stbrp_context
--- @field width       int
--- @field height      int
--- @field align       int
--- @field init_mode   int
--- @field heuristic   int
--- @field num_nodes   int
--- @field active_head stbrp_node
--- @field free_head   stbrp_node
--- @field extra       stbrp_node[]

--- @return stbrp_context
--- @nodiscard
local function stbrp_context()
    return {
        width     = 0,
        height    = 0,
        align     = 0,
        init_mode = 0,
        heuristic = 0,
        num_nodes = 0,

        active_head = nil,
        free_head   = nil,
        extra       = {stbrp_node(), stbrp_node()}
    }
end

--- @class stbrp__findresult
--- @field x               int
--- @field y               int
--- @field prev_link?      table
--- @field prev_link_type? int

--- @return stbrp__findresult
local function stbrp__findresult()
    return {
        x = 0,
        y = 0,

        prev_link      = nil,
        prev_link_type = nil
    }
end

--------------------------
--------------------------
---
--- IMPLEMENTATION SECTION
---
---

--- @param context   stbrp_context
--- @param heuristic int
local function stbrp_setup_heuristic(context, heuristic)
    if context.init_mode == STBRP__INIT_skyline then
        STBRP_ASSERT(heuristic == STBRP_HEURISTIC_Skyline.BL_sortHeight or heuristic == STBRP_HEURISTIC_Skyline.BF_sortHeight)
        context.heuristic = heuristic
    else
        STBRP_ASSERT(false)
    end
end

--- @param context          stbrp_context
--- @param allow_out_of_mem boolean
local function stbrp_setup_allow_out_of_mem(context, allow_out_of_mem)
    if allow_out_of_mem then
        context.align = 1
    else
        context.align = (context.width + context.num_nodes - 1) / context.num_nodes
    end
end

--- @param context   stbrp_context
--- @param width     int
--- @param height    int
--- @param nodes     stbrp_node[]
--- @param num_nodes int
function stbrp_init_target(context, width, height, nodes, num_nodes)
    for i = 1, num_nodes - 1 do
        nodes[i].next = nodes[i + 1]
    end
    nodes[num_nodes].next = nil
    context.init_mode = STBRP__INIT_skyline
    context.heuristic = STBRP_HEURISTIC_Skyline.default
    context.free_head = nodes[1]
    context.active_head = context.extra[1]
    context.width = width
    context.height = height
    context.num_nodes = num_nodes
    stbrp_setup_allow_out_of_mem(context, false)

    context.extra[1].x = 0
    context.extra[1].y = 0
    context.extra[1].next = context.extra[2]
    context.extra[2].x = width
    context.extra[2].y = bit32.lshift(1, 30)
    context.extra[2].next = nil
end

--- @param c stbrp_context
--- @param first stbrp_node
--- @param x0 int
--- @param width int
--- @return int, int
local function stbrp__skyline_find_min_y(c, first, x0, width)
    local node = first
    local x1 = x0 + width

    STBRP__NOTUSED(c)

    STBRP_ASSERT(first.x <= x0)

    STBRP_ASSERT(node.next.x > x0)

    STBRP_ASSERT(node.x <= x0)

    local min_y = 0
    local waste_area = 0
    local visited_width = 0
    while node.x < x1 do
        if node.y > min_y then
            waste_area = waste_area + visited_width * (node.y - min_y)
            min_y = node.y
            if node.x < x0 then
                visited_width = visited_width + node.next.x - x0
            else
                visited_width = visited_width + node.next.x - node.x
            end
        else
            local under_width = node.next.x - node.x
            if under_width + visited_width > width then
                under_width = width - visited_width
            end
            waste_area = waste_area + under_width * (min_y - node.y)
            visited_width = visited_width + under_width
        end
        node = node.next
    end

    return min_y, waste_area
end

--- @param c      stbrp_context
--- @param width  int
--- @param height int
--- @return stbrp__findresult
local function stbrp__skyline_find_best_pos(c, width, height)
    local best_waste = bit32.lshift(1, 30)
    local best_x = 0
    local best_y = bit32.lshift(1, 30)
    local fr = stbrp__findresult()
    local best_prev_link = nil
    local best_prev_link_type = nil

    width = width + c.align - 1
    width = width - width % c.align
    STBRP_ASSERT(width % c.align == 0)

    if width > c.width or height > c.height then
        fr.prev_link = nil
        fr.prev_link_type = nil
        fr.x = 0
        fr.y = 0
        return fr
    end

    local prev_link = c
    local prev_link_type = STBRP__PREV_LINK_TYPE.ACTIVE_HEAD
    local node = c.active_head

    while (node.x + width <= c.width) do
        local y, waste = stbrp__skyline_find_min_y(c, node, node.x, width)

        if c.heuristic == STBRP_HEURISTIC_Skyline.BL_sortHeight then
            if y < best_y then
                best_y = y
                best_prev_link = prev_link
                best_prev_link_type = prev_link_type
                best_x = node.x
            end
        else
            if y + height <= c.height then
                if y < best_y or (y == best_y and waste < best_waste) then
                    best_y = y
                    best_waste = waste
                    best_prev_link = prev_link
                    best_prev_link_type = prev_link_type
                    best_x = node.x
                end
            end
        end

        prev_link = node
        prev_link_type = STBRP__PREV_LINK_TYPE.NEXT
        node = node.next
    end

    if c.heuristic == STBRP_HEURISTIC_Skyline.BF_sortHeight then
        local tail = c.active_head
        local node_scan = c.active_head
        local prev_link_scan = c
        local prev_link_scan_type = STBRP__PREV_LINK_TYPE.ACTIVE_HEAD

        while tail and tail.x < width do
            tail = tail.next
        end

        while tail do
            local xpos = tail.x - width
            STBRP_ASSERT(xpos >= 0)

            while node_scan.next and node_scan.next.x <= xpos do
                prev_link_scan = node_scan
                prev_link_scan_type = STBRP__PREV_LINK_TYPE.NEXT
                node_scan = node_scan.next
            end

            if node_scan then
                STBRP_ASSERT(node_scan.next.x > xpos and node_scan.x <= xpos)

                local y, waste = stbrp__skyline_find_min_y(c, node_scan, xpos, width)

                if y + height <= c.height then
                    if y <= best_y then
                        if y < best_y or waste < best_waste or (waste == best_waste and xpos < best_x) then
                            best_x = xpos
                            best_y = y
                            best_waste = waste
                            best_prev_link = prev_link_scan
                            best_prev_link_type = prev_link_scan_type
                        end
                    end
                end
            end

            tail = tail.next
        end
    end

    fr.prev_link = best_prev_link
    fr.prev_link_type = best_prev_link_type
    fr.x = best_x
    fr.y = best_y
    return fr
end

--- @param context stbrp_context
--- @param width   int
--- @param height  int
--- @return stbrp__findresult
local function stbrp__skyline_pack_rectangle(context, width, height)
    local res = stbrp__skyline_find_best_pos(context, width, height)

    if res.prev_link == nil or res.y + height > context.height or context.free_head == nil then
        res.prev_link = nil
        res.prev_link_type = nil
        return res
    end

    local node = context.free_head
    node.x = res.x
    node.y = res.y + height
    context.free_head = node.next

    local cur
    if res.prev_link_type == STBRP__PREV_LINK_TYPE.ACTIVE_HEAD then
        cur = res.prev_link.active_head
    else
        cur = res.prev_link.next
    end

    if cur.x < res.x then
        local next = cur.next
        cur.next = node
        cur = next
    else
        if res.prev_link_type == STBRP__PREV_LINK_TYPE.ACTIVE_HEAD then
            res.prev_link.active_head = node
        else
            res.prev_link.next = node
        end
    end

    while cur.next and cur.next.x <= res.x + width do
        local next = cur.next
        cur.next = context.free_head
        context.free_head = cur
        cur = next
    end

    node.next = cur

    if cur.x < res.x + width then
        cur.x = res.x + width
    end

    return res
end

--- @param a stbrp_rect
--- @param b stbrp_rect
--- @return bool
--- @package
local function rect_height_compare(a, b)
    if a.h > b.h then
        return true
    elseif a.h < b.h then
        return false
    else
        return a.w > b.w
    end
end

--- @param a stbrp_rect
--- @param b stbrp_rect
--- @return bool
--- @package
local function rect_original_order(a, b)
    return a.was_packed < b.was_packed
end

--- @param context   stbrp_context
--- @param rects     stbrp_rect[]
--- @param num_rects int
--- @return int
local function stbrp_pack_rects(context, rects, num_rects)
    local all_rects_packed = 1

    for i = 1, num_rects do
        rects[i].was_packed = (i - 1)
    end

    STBRP_SORT(rects, rect_height_compare)

    for i = 1, num_rects do
        if rects[i].w == 0 or rects[i].h == 0 then
            rects[i].x = 0
            rects[i].y = 0
        else
            local fr = stbrp__skyline_pack_rectangle(context, rects[i].w, rects[i].h)
            if fr.prev_link then
                rects[i].x = fr.x
                rects[i].y = fr.y
            else
                rects[i].x = STBRP__MAXVAL
                rects[i].y = STBRP__MAXVAL
            end
        end
    end

    STBRP_SORT(rects, rect_original_order)

    for i = 1, num_rects do
        rects[i].was_packed = (rects[i].x == STBRP__MAXVAL and rects[i].y == STBRP__MAXVAL) and 0 or 1
        if rects[i].was_packed == 0 then
            all_rects_packed = 0
        end
    end

    return all_rects_packed
end

return {
    context = stbrp_context,
    rect    = stbrp_rect,
    node    = stbrp_node,

    pack_rects             = stbrp_pack_rects,
    init_target            = stbrp_init_target,
    setup_allow_out_of_mem = stbrp_setup_allow_out_of_mem,
    setup_heuristic        = stbrp_setup_heuristic
}
end

__FILES['imstb_textedit.lua'] = function()
--- ImGui Sincerely
-- This is a Lua port of original `imstb_textedit.h`

-- ALL TABLES IN THIS FILE ARE 1-BASED!
-- Character Indexing:
--     idx=n, the n'th char (1-based)
-- Cursor Indexing:
--     idx=n, the position before the n'th char
--     idx=n+1, the position after the n'th char

-- Symbols that must be defined before using this:
local STB_TEXTEDIT_STRINGLEN = ImStb.TEXTEDIT_STRINGLEN
local STB_TEXTEDIT_GETCHAR   = ImStb.TEXTEDIT_GETCHAR
local STB_TEXTEDIT_GETWIDTH  = ImStb.TEXTEDIT_GETWIDTH
local STB_TEXTEDIT_LAYOUTROW = ImStb.TEXTEDIT_LAYOUTROW
local IMSTB_TEXTEDIT_GETNEXTCHARINDEX = ImStb.TEXTEDIT_GETNEXTCHARINDEX
local IMSTB_TEXTEDIT_GETPREVCHARINDEX = ImStb.TEXTEDIT_GETPREVCHARINDEX
local STB_TEXTEDIT_MOVEWORDLEFT  = ImStb.TEXTEDIT_MOVEWORDLEFT
local STB_TEXTEDIT_MOVEWORDRIGHT = ImStb.TEXTEDIT_MOVEWORDRIGHT
local STB_TEXTEDIT_MOVELINESTART = ImStb.TEXTEDIT_MOVELINESTART
local STB_TEXTEDIT_MOVELINEEND   = ImStb.TEXTEDIT_MOVELINEEND
local STB_TEXTEDIT_DELETECHARS   = ImStb.TEXTEDIT_DELETECHARS
local STB_TEXTEDIT_INSERTCHARS   = ImStb.TEXTEDIT_INSERTCHARS

STB_TEXTEDIT_NEWLINE     = 10
STB_TEXTEDIT_K_LEFT      = 0x200000 -- keyboard input to move cursor left
STB_TEXTEDIT_K_RIGHT     = 0x200001 -- keyboard input to move cursor right
STB_TEXTEDIT_K_UP        = 0x200002 -- keyboard input to move cursor up
STB_TEXTEDIT_K_DOWN      = 0x200003 -- keyboard input to move cursor down
STB_TEXTEDIT_K_LINESTART = 0x200004 -- keyboard input to move cursor to start of line
STB_TEXTEDIT_K_LINEEND   = 0x200005 -- keyboard input to move cursor to end of line
STB_TEXTEDIT_K_TEXTSTART = 0x200006 -- keyboard input to move cursor to start of text
STB_TEXTEDIT_K_TEXTEND   = 0x200007 -- keyboard input to move cursor to end of text
STB_TEXTEDIT_K_DELETE    = 0x200008 -- keyboard input to delete selection or character under cursor
STB_TEXTEDIT_K_BACKSPACE = 0x200009 -- keyboard input to delete selection or character left of cursor
STB_TEXTEDIT_K_UNDO      = 0x20000A -- keyboard input to perform undo
STB_TEXTEDIT_K_REDO      = 0x20000B -- keyboard input to perform redo
STB_TEXTEDIT_K_WORDLEFT  = 0x20000C -- keyboard input to move cursor left one word
STB_TEXTEDIT_K_WORDRIGHT = 0x20000D -- keyboard input to move cursor right one word
STB_TEXTEDIT_K_PGUP      = 0x20000E -- keyboard input to move cursor up a page
STB_TEXTEDIT_K_PGDOWN    = 0x20000F -- keyboard input to move cursor down a page
STB_TEXTEDIT_K_SHIFT     = 0x400000

IMSTB_TEXTEDIT_UNDOSTATECOUNT = 99
local IMSTB_TEXTEDIT_UNDOCHARCOUNT  = 999
local IMSTB_TEXTEDIT_memmove = ImStb.TEXTEDIT_memmove

local stb_text_undo
local stb_text_redo

----------------------------------------------------------------
----------------------------------------------------------------
---
--- STB_TexteditState
---
--- Definition of STB_TexteditState which you should store
--- per-textfield; it includes cursor position, selection state,
--- and undo state.
---
--- @alias IMSTB_TEXTEDIT_POSITIONTYPE int
--- @alias IMSTB_TEXTEDIT_CHARTYPE     char

--- @alias STB_TEXTEDIT_KEYTYPE int

--- @class StbUndoRecord
--- @field where         IMSTB_TEXTEDIT_POSITIONTYPE
--- @field insert_length IMSTB_TEXTEDIT_POSITIONTYPE
--- @field delete_length IMSTB_TEXTEDIT_POSITIONTYPE
--- @field char_storage  int

--- @return StbUndoRecord
--- @nodiscard
local function StbUndoRecord()
    return {
        where         = 1,
        insert_length = 0,
        delete_length = 0,
        char_storage  = 1
    }
end

--- @class StbUndoState
--- @field undo_rec        StbUndoRecord[]           # size = IMSTB_TEXTEDIT_UNDOSTATECOUNT
--- @field undo_char       IMSTB_TEXTEDIT_CHARTYPE[] # size = IMSTB_TEXTEDIT_UNDOCHARCOUNT
--- @field undo_point      short                     # next available slot
--- @field redo_point      short                     # next available slot
--- @field undo_char_point int                       # next available slot
--- @field redo_char_point int                       # next available slot

--- @return StbUndoState
--- @nodiscard
local function StbUndoState()
    local undo_rec = {}
    for i = 1, IMSTB_TEXTEDIT_UNDOSTATECOUNT do
        undo_rec[i] = StbUndoRecord()
    end

    local undo_char = {}
    for i = 1, IMSTB_TEXTEDIT_UNDOCHARCOUNT do
        undo_char[i] = 0
    end

    return {
        undo_rec        = undo_rec,
        undo_char       = undo_char,

        undo_point      = 1,
        redo_point      = 1,
        undo_char_point = 1,
        redo_char_point = 1
    }
end

--- @class STB_TexteditState
--- @field cursor                int           # position of the text cursor within the string
--- @field select_start          int           # selection start point
--- @field select_end            int
--- @field insert_mode           bool
--- @field row_count_per_page    int
--- @field cursor_at_end_of_line bool          # not implemented yet
--- @field initialized           bool
--- @field has_preferred_x       bool
--- @field single_line           bool
--- @field padding1              unsigned_char
--- @field padding2              unsigned_char
--- @field padding3              unsigned_char
--- @field preferred_x           float
--- @field undostate             StbUndoState

--- @return STB_TexteditState
--- @nodiscard
function STB_TexteditState()
    return {
        cursor = 0,

        select_start = 0,
        select_end   = 0,

        insert_mode = false,

        row_count_per_page = 0,

        cursor_at_end_of_line = false,
        initialized           = false,
        has_preferred_x       = false,
        single_line           = false,
        padding1 = 0,
        padding2 = 0,
        padding3 = 0,

        preferred_x = 0.0,

        undostate = StbUndoState()
    }
end

--- @param s STB_TexteditState
local function STB_TEXT_HAS_SELECTION(s)
    return s.select_start ~= s.select_end
end

--- @class StbTexteditRow
--- @field x0               float # starting x location
--- @field x1               float # end x location
--- @field baseline_y_delta float # position of baseline relative to previous row's baseline
--- @field ymin             float # height of row above baseline
--- @field ymax             float # height of row below baseline
--- @field num_chars        int

--- @return StbTexteditRow
--- @nodiscard
local function StbTexteditRow()
    return {
        x0 = 0.0,
        x1 = 0.0,

        baseline_y_delta = 0.0,

        ymin = 0.0,
        ymax = 0.0,

        num_chars = 0
    }
end

--- @param r StbTexteditRow
local function StbTexteditRow_Reset(r)
    r.x0 = 0.0
    r.x1 = 0.0
    r.baseline_y_delta = 0.0
    r.ymin = 0.0
    r.ymax = 0.0
    r.num_chars = 0
end

----------------------------------------
----------------------------------------
---
--- Implementation
---
---

local stb_text_locate_coord do

-- only create once, reuse later
local r = StbTexteditRow()

--- traverse the layout to locate the nearest character to a display position
--- @param str IMSTB_TEXTEDIT_STRING
--- @param x   float
--- @param y   float
--- @return int  idx
--- @return bool side_on_line
function stb_text_locate_coord(str, x, y)
    local n = STB_TEXTEDIT_STRINGLEN(str)
    local base_y = 0
    local prev_x

    StbTexteditRow_Reset(r)

    local out_side_on_line = false

    -- search rows to find one that straddles 'y'
    local i = 1
    while i <= n do
        STB_TEXTEDIT_LAYOUTROW(r, str, i)
        if r.num_chars <= 0 then
            return n + 1, out_side_on_line
        end

        if i == 1 and y < base_y + r.ymin then
            return 1, out_side_on_line
        end

        if y < base_y + r.ymax then
            break
        end

        i = i + r.num_chars
        base_y = base_y + r.baseline_y_delta
    end

    -- below all text, return 'after' last character
    if i > n then
        out_side_on_line = true
        return n + 1, out_side_on_line
    end

    -- check if it's before the beginning of the line
    if x < r.x0 then
        return i, out_side_on_line
    end

    -- check if it's before the end of the line
    if x < r.x1 then
        -- search characters in row for one that straddles 'x'
        prev_x = r.x0
        local k = 1
        while k <= r.num_chars do
            local w = STB_TEXTEDIT_GETWIDTH(str, i, k)
            if x < prev_x + w then
                out_side_on_line = (k == 1) and false or true
                if x < prev_x + w / 2 then
                    return k + i - 1, out_side_on_line
                else
                    return IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, i + k - 1), out_side_on_line
                end
            end
            prev_x = prev_x + w
            k = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, i + k - 1) - i + 1
        end
        -- shouldn't happen, but if it does, fall through to end-of-line case
    end

    -- if the last character is a newline, return that. otherwise return 'after' the last character
    out_side_on_line = true
    if STB_TEXTEDIT_GETCHAR(str, i + r.num_chars - 1) == STB_TEXTEDIT_NEWLINE then
        return i + r.num_chars - 1, out_side_on_line
    else
        return i + r.num_chars, out_side_on_line
    end
end

end

local stb_textedit_click do

local r = StbTexteditRow()

-- API click: on mouse down, move the cursor to the clicked location, and reset the selection
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
--- @param x     float
--- @param y     float
function stb_textedit_click(str, state, x, y)
    -- In single-line mode, just always make y = 0. This lets the drag keep working if the mouse
    -- goes off the top or bottom of the text
    local side_on_line
    if state.single_line then
        StbTexteditRow_Reset(r)
        STB_TEXTEDIT_LAYOUTROW(r, str, 1)
        y = r.ymin
    end

    state.cursor, side_on_line = stb_text_locate_coord(str, x, y)
    state.select_start = state.cursor
    state.select_end = state.cursor
    state.has_preferred_x = false
    str.LastMoveDirectionLR = side_on_line and ImGuiDir.Right or ImGuiDir.Left
end

end

local stb_textedit_drag do

local r = StbTexteditRow()

-- API drag: on mouse drag, move the cursor and selection endpoint to the clicked location
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
--- @param x     float
--- @param y     float
function stb_textedit_drag(str, state, x, y)
    local p = 1
    local side_on_line

    -- In single-line mode, just always make y = 0. This lets the drag keep working if the mouse
    -- goes off the top or bottom of the text
    if state.single_line then
        StbTexteditRow_Reset(r)
        STB_TEXTEDIT_LAYOUTROW(r, str, 1)
        y = r.ymin
    end

    if state.select_start == state.select_end then
        state.select_start = state.cursor
    end

    p, side_on_line = stb_text_locate_coord(str, x, y)
    state.cursor = p
    state.select_end = p
    str.LastMoveDirectionLR = (side_on_line ~= false) and ImGuiDir.Right or ImGuiDir.Left
end

end

---------------------------
---------------------------
---
--- Keyboard input handling
---
---

local stb_text_makeundo_insert
local stb_text_makeundo_delete
local stb_text_makeundo_replace

--- @class StbFindState
--- @field x          float # position of n'th character
--- @field y          float
--- @field height     float # height of line
--- @field first_char int   # first char of row, and length
--- @field length     int
--- @field prev_first int   # first char of previous row

--- @return StbFindState
local function StbFindState()
    return {
        x = 0.0, y = 0.0,
        height = 0.0,
        first_char = 0, length = 0,
        prev_first = 0
    }
end

--- @param f StbFindState
local function StbFindState_Reset(f)
    f.x = 0.0
    f.y = 0.0
    f.height = 0.0
    f.first_char = 0
    f.length = 0
    f.prev_first = 0
end

local stb_textedit_find_charpos do

local r = StbTexteditRow()

-- find the x/y location of a character, and remember info about the previous row in
-- case we get a move-up event (for page up, we'll have to rescan)
--- @param find        StbFindState
--- @param str         IMSTB_TEXTEDIT_STRING
--- @param n           int
--- @param single_line bool
function stb_textedit_find_charpos(find, str, n, single_line)
    StbTexteditRow_Reset(r)
    local prev_start = 1
    local z = STB_TEXTEDIT_STRINGLEN(str)
    local first

    -- special case if it's at the end (may not be needed?)
    if n == z + 1 and single_line then
        STB_TEXTEDIT_LAYOUTROW(r, str, 1)
        find.y = 0
        find.first_char = 1
        find.length = z
        find.height = r.ymax - r.ymin
        find.x = r.x1

        return
    end

    -- search rows to find the one that straddles character n
    find.y = 0

    local i = 1
    while true do
        STB_TEXTEDIT_LAYOUTROW(r, str, i)
        if n < i + r.num_chars - 1 then
            break
        end
        if str.LastMoveDirectionLR == ImGuiDir.Right and str.Stb.cursor > 1 and str.Stb.cursor == i + r.num_chars and STB_TEXTEDIT_GETCHAR(str, i + r.num_chars - 1) ~= STB_TEXTEDIT_NEWLINE then -- [IMGUI] Wrapping point handling
            break
        end
        if (i - 1) + r.num_chars == z and z > 0 and STB_TEXTEDIT_GETCHAR(str, z) ~= STB_TEXTEDIT_NEWLINE then -- [IMGUI] special handling for last line
            break
        end
        prev_start = i
        i = i + r.num_chars
        find.y = find.y + r.baseline_y_delta
        if i == z + 1 then -- [IMGUI]
            r.num_chars = 0
            break
        end
    end

    find.first_char = i
    first = i
    find.length = r.num_chars
    find.height = r.ymax - r.ymin
    find.prev_first = prev_start

    -- now scan to find xpos
    find.x = r.x0
    i = 1
    while first + i <= n + 1 do
        find.x = find.x + STB_TEXTEDIT_GETWIDTH(str, first, i)
        i = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, first + i - 1) - first + 1
    end
end

end

-- make the selection/cursor state valid if client altered the string
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
local function stb_textedit_clamp(str, state)
    local n = STB_TEXTEDIT_STRINGLEN(str)
    if STB_TEXT_HAS_SELECTION(state) then
        if state.select_start > n + 1 then state.select_start = n + 1 end
        if state.select_end > n + 1 then state.select_end = n + 1 end
        -- if clamping forced them to be equal, move the cursor to match
        if state.select_start == state.select_end then
            state.cursor = state.select_start
        end
    end
    if state.cursor > n + 1 then state.cursor = n + 1 end
end

-- delete characters while updating undo
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
--- @param where int
--- @param len   int
local function stb_textedit_delete(str, state, where, len)
    stb_text_makeundo_delete(str, state, where, len)
    STB_TEXTEDIT_DELETECHARS(str, where, len)
    state.has_preferred_x = false
end

-- delete the selection
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
local function stb_textedit_delete_selection(str, state)
    stb_textedit_clamp(str, state)
    if STB_TEXT_HAS_SELECTION(state) then
        if state.select_start < state.select_end then
            stb_textedit_delete(str, state, state.select_start, state.select_end - state.select_start)
            state.cursor = state.select_start
            state.select_end = state.cursor
        else
            stb_textedit_delete(str, state, state.select_end, state.select_start - state.select_end)
            state.cursor = state.select_end
            state.select_start = state.cursor
        end
        state.has_preferred_x = false
    end
end

-- canonicalize the selection so start <= end
--- @param state STB_TexteditState
local function stb_textedit_sortselection(state)
    if state.select_end < state.select_start then
        local temp = state.select_end
        state.select_end = state.select_start
        state.select_start = temp
    end
end

-- move cursor to first character of selection
--- @param state STB_TexteditState
local function stb_textedit_move_to_first(state)
    if STB_TEXT_HAS_SELECTION(state) then
        stb_textedit_sortselection(state)
        state.cursor = state.select_start
        state.select_end = state.select_start
        state.has_preferred_x = false
    end
end

-- move cursor to last character of selection
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
local function stb_textedit_move_to_last(str, state)
    if STB_TEXT_HAS_SELECTION(state) then
        stb_textedit_sortselection(state)
        stb_textedit_clamp(str, state)
        state.cursor = state.select_end
        state.select_start = state.select_end
        state.has_preferred_x = false
    end
end

-- update selection and cursor to match each other
--- @param state STB_TexteditState
local function stb_textedit_prep_selection_at_cursor(state)
    if not STB_TEXT_HAS_SELECTION(state) then
        state.select_start = state.cursor
        state.select_end = state.cursor
    else
        state.cursor = state.select_end
    end
end

-- API cut: delete selection
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
--- @return bool
local function stb_textedit_cut(str, state)
    if STB_TEXT_HAS_SELECTION(state) then
        stb_textedit_delete_selection(str, state) -- implicitly clamps
        state.has_preferred_x = false
        return true
    end
    return false
end

-- API paste: replace existing selection with passed-in text
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
--- @param text  IMSTB_TEXTEDIT_CHARTYPE[]
--- @param len   int
--- @return bool
local function stb_textedit_paste_internal(str, state, text, len)
    -- if there's a selection, the paste should delete it
    stb_textedit_clamp(str, state)
    stb_textedit_delete_selection(str, state)
    -- try to insert the characters
    len = STB_TEXTEDIT_INSERTCHARS(str, state.cursor, text, 1, len)
    if len then
        stb_text_makeundo_insert(state, state.cursor, len)
        state.cursor = state.cursor + len
        state.has_preferred_x = false
        return true
    end
    -- note: paste failure will leave deleted selection, may be restored with an undo (see https://github.com/nothings/stb/issues/734 for details)
    return false
end

-- API key: process text input
-- [IMGUI] Added stb_textedit_text(), extracted out and called by stb_textedit_key() for backward compatibility.
--- @param str       IMSTB_TEXTEDIT_STRING
--- @param state     STB_TexteditState
--- @param text      IMSTB_TEXTEDIT_CHARTYPE[]
--- @param text_len int
local function stb_textedit_text(str, state, text, text_len)
    -- can't add newline in single-line mode
    if text[1] == STB_TEXTEDIT_NEWLINE and state.single_line then
        return
    end

    if state.insert_mode and not STB_TEXT_HAS_SELECTION(state) and state.cursor < STB_TEXTEDIT_STRINGLEN(str) then
        stb_text_makeundo_replace(str, state, state.cursor, 1, 1)
        STB_TEXTEDIT_DELETECHARS(str, state.cursor, 1)
        text_len = STB_TEXTEDIT_INSERTCHARS(str, state.cursor, text, 1, text_len)
        if text_len then
            state.cursor = state.cursor + text_len
            state.has_preferred_x = false
        end
    else
        stb_textedit_delete_selection(str, state) -- implicitly clamps
        text_len = STB_TEXTEDIT_INSERTCHARS(str, state.cursor, text, 1, text_len)
        if text_len then
            stb_text_makeundo_insert(state, state.cursor, text_len)
            state.cursor = state.cursor + text_len
            state.has_preferred_x = false
        end
    end
end

local stb_textedit_key do

local find = StbFindState()
local row = StbTexteditRow()

-- API key: process a keyboard input
--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
--- @param key   STB_TEXTEDIT_KEYTYPE
function stb_textedit_key(str, state, key)
    if key == STB_TEXTEDIT_K_UNDO then
        stb_text_undo(str, state)
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_REDO then
        stb_text_redo(str, state)
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_LEFT then
        -- if currently there's a selection, move cursor to start of selection
        if STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_move_to_first(state)
        else
            if state.cursor > 1 then
                state.cursor = IMSTB_TEXTEDIT_GETPREVCHARINDEX(str, state.cursor)
            end
        end

        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_RIGHT then
        -- if currently there's a selection, move cursor to end of selection
        if STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_move_to_last(str, state)
        else
            state.cursor = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state.cursor)
        end

        stb_textedit_clamp(str, state)
        state.has_preferred_x = false
    elseif key == bit32.bor(STB_TEXTEDIT_K_LEFT, STB_TEXTEDIT_K_SHIFT) then
        stb_textedit_clamp(str, state)
        stb_textedit_prep_selection_at_cursor(state)
        -- move selection left
        if state.select_end > 1 then
            state.select_end = IMSTB_TEXTEDIT_GETPREVCHARINDEX(str, state.select_end)
        end
        state.cursor = state.select_end
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_WORDLEFT then
        -- if currently there's a selection, move cursor to start of selection
        if STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_move_to_first(state)
        else
            state.cursor = STB_TEXTEDIT_MOVEWORDLEFT(str, state.cursor)
            stb_textedit_clamp(str, state)
        end
    elseif key == bit32.bor(STB_TEXTEDIT_K_WORDLEFT, STB_TEXTEDIT_K_SHIFT) then
        if not STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_prep_selection_at_cursor(state)
        end

        state.cursor = STB_TEXTEDIT_MOVEWORDLEFT(str, state.cursor)
        state.select_end = state.cursor

        stb_textedit_clamp(str, state)
    elseif key == STB_TEXTEDIT_K_WORDRIGHT then
        -- if currently there's a selection, move cursor to end of selection
        if STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_move_to_last(str, state)
        else
            state.cursor = STB_TEXTEDIT_MOVEWORDRIGHT(str, state.cursor)
            stb_textedit_clamp(str, state)
        end
    elseif key == bit32.bor(STB_TEXTEDIT_K_WORDRIGHT, STB_TEXTEDIT_K_SHIFT) then
        if not STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_prep_selection_at_cursor(state)
        end

        state.cursor = STB_TEXTEDIT_MOVEWORDRIGHT(str, state.cursor)
        state.select_end = state.cursor

        stb_textedit_clamp(str, state)
    elseif key == bit32.bor(STB_TEXTEDIT_K_RIGHT, STB_TEXTEDIT_K_SHIFT) then
        stb_textedit_prep_selection_at_cursor(state)
        -- move selection right
        state.select_end = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state.select_end)
        stb_textedit_clamp(str, state)
        state.cursor = state.select_end
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_DOWN
        or key == bit32.bor(STB_TEXTEDIT_K_DOWN, STB_TEXTEDIT_K_SHIFT)
        or key == STB_TEXTEDIT_K_PGDOWN
        or key == bit32.bor(STB_TEXTEDIT_K_PGDOWN, STB_TEXTEDIT_K_SHIFT) then

        StbFindState_Reset(find)
        StbTexteditRow_Reset(row)
        local sel = (bit32.band(key, STB_TEXTEDIT_K_SHIFT) ~= 0)
        local is_page = (bit32.band(key, bit32.bnot(STB_TEXTEDIT_K_SHIFT)) == STB_TEXTEDIT_K_PGDOWN)
        local row_count = is_page and state.row_count_per_page or 1

        if not is_page and state.single_line then
            -- on windows, up&down in single-line behave like left&right
            key = bit32.bor(STB_TEXTEDIT_K_RIGHT, bit32.band(key, STB_TEXTEDIT_K_SHIFT))
            return stb_textedit_key(str, state, key) -- was `goto retry`
        end

        if sel then
            stb_textedit_prep_selection_at_cursor(state)
        elseif STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_move_to_last(str, state)
        end

        -- compute current position of cursor point
        stb_textedit_clamp(str, state)
        stb_textedit_find_charpos(find, str, state.cursor, state.single_line)

        for j = 1, row_count do
            local goal_x = state.has_preferred_x and state.preferred_x or find.x
            local x
            local start = find.first_char + find.length

            if find.length == 0 then
                break
            end

            -- [IMGUI]
            -- going down while being on the last line shouldn't bring us to that line end
            --if STB_TEXTEDIT_GETCHAR(str, find.first_char + find.length - 1) ~= STB_TEXTEDIT_NEWLINE then
            --   break
            --end

            -- now find character position down a row
            state.cursor = start
            STB_TEXTEDIT_LAYOUTROW(row, str, state.cursor)
            x = row.x0
            local i = 1
            while i <= row.num_chars do
                local dx = STB_TEXTEDIT_GETWIDTH(str, start, i)
                local next = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state.cursor)
                x = x + dx
                if x > goal_x then
                    break
                end
                i = i + (next - state.cursor)
                state.cursor = next
            end
            stb_textedit_clamp(str, state)

            if state.cursor == find.first_char + find.length then
                str.LastMoveDirectionLR = ImGuiDir.Left
            end
            state.has_preferred_x = true
            state.preferred_x = goal_x

            if sel then
                state.select_end = state.cursor
            end

            -- go to next line
            find.first_char = find.first_char + find.length
            find.length = row.num_chars
        end
    elseif key == STB_TEXTEDIT_K_UP
        or key == bit32.bor(STB_TEXTEDIT_K_UP, STB_TEXTEDIT_K_SHIFT)
        or key == STB_TEXTEDIT_K_PGUP
        or key == bit32.bor(STB_TEXTEDIT_K_PGUP, STB_TEXTEDIT_K_SHIFT) then

        StbFindState_Reset(find)
        StbTexteditRow_Reset(row)
        local sel = (bit32.band(key, STB_TEXTEDIT_K_SHIFT) ~= 0)
        local is_page = (bit32.band(key, bit32.bnot(STB_TEXTEDIT_K_SHIFT)) == STB_TEXTEDIT_K_PGUP)
        local row_count = is_page and state.row_count_per_page or 1

        if not is_page and state.single_line then
            -- on windows, up&down become left&right
            key = bit32.bor(STB_TEXTEDIT_K_LEFT, bit32.band(key, STB_TEXTEDIT_K_SHIFT))
            return stb_textedit_key(str, state, key) -- was `goto retry`
        end

        if sel then
            stb_textedit_prep_selection_at_cursor(state)
        elseif STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_move_to_first(state)
        end

        -- compute current position of cursor point
        stb_textedit_clamp(str, state)
        stb_textedit_find_charpos(find, str, state.cursor, state.single_line)

        for j = 1, row_count do
            local goal_x
            if state.has_preferred_x then
                goal_x = state.preferred_x
            else
                goal_x = find.x
            end
            local x

            -- can only go up if there's a previous row
            if find.prev_first == find.first_char then
                break
            end

            -- now find character position up a row
            state.cursor = find.prev_first
            STB_TEXTEDIT_LAYOUTROW(row, str, state.cursor)
            x = row.x0
            local i = 1
            while i <= row.num_chars do
                local dx = STB_TEXTEDIT_GETWIDTH(str, find.prev_first, i)
                local next = IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state.cursor)
                x = x + dx
                if x > goal_x then
                    break
                end
                i = i + (next - state.cursor)
                state.cursor = next
            end
            stb_textedit_clamp(str, state)

            if state.cursor == find.first_char then
                str.LastMoveDirectionLR = ImGuiDir.Right
            elseif state.cursor == find.prev_first then
                str.LastMoveDirectionLR = ImGuiDir.Left
            end
            state.has_preferred_x = true
            state.preferred_x = goal_x

            if sel then
                state.select_end = state.cursor
            end

            -- go to previous line
            -- (we need to scan previous line the hard way. maybe we could expose this as a new API function?)
            local prev_scan = find.prev_first > 1 and find.prev_first - 1 or 1
            while prev_scan > 1 do
                local prev = IMSTB_TEXTEDIT_GETPREVCHARINDEX(str, prev_scan)
                if STB_TEXTEDIT_GETCHAR(str, prev) == STB_TEXTEDIT_NEWLINE then
                    break
                end
                prev_scan = prev
            end
            find.first_char = find.prev_first
            find.prev_first = STB_TEXTEDIT_MOVELINESTART(str, state, prev_scan)
        end
    elseif key == STB_TEXTEDIT_K_DELETE
        or key == bit32.bor(STB_TEXTEDIT_K_DELETE, STB_TEXTEDIT_K_SHIFT) then

        if STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_delete_selection(str, state)
        else
            local n = STB_TEXTEDIT_STRINGLEN(str)
            if state.cursor <= n then
                stb_textedit_delete(str, state, state.cursor, IMSTB_TEXTEDIT_GETNEXTCHARINDEX(str, state.cursor) - state.cursor)
            end
        end
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_BACKSPACE
        or key == bit32.bor(STB_TEXTEDIT_K_BACKSPACE, STB_TEXTEDIT_K_SHIFT) then

        if STB_TEXT_HAS_SELECTION(state) then
            stb_textedit_delete_selection(str, state)
        else
            stb_textedit_clamp(str, state)
            if state.cursor > 1 then
                local prev = IMSTB_TEXTEDIT_GETPREVCHARINDEX(str, state.cursor)
                stb_textedit_delete(str, state, prev, state.cursor - prev)
                state.cursor = prev
            end
        end
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_TEXTSTART then
        state.cursor = 1
        state.select_start = 1
        state.select_end = 1
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_TEXTEND then
        state.cursor = STB_TEXTEDIT_STRINGLEN(str) + 1
        state.select_start = 1
        state.select_end = 1
        state.has_preferred_x = false
    elseif key == bit32.bor(STB_TEXTEDIT_K_TEXTSTART, STB_TEXTEDIT_K_SHIFT) then
        stb_textedit_prep_selection_at_cursor(state)
        state.cursor = 1
        state.select_end = 1
        state.has_preferred_x = false
    elseif key == bit32.bor(STB_TEXTEDIT_K_TEXTEND, STB_TEXTEDIT_K_SHIFT) then
        stb_textedit_prep_selection_at_cursor(state)
        state.cursor = STB_TEXTEDIT_STRINGLEN(str) + 1
        state.select_end = state.cursor
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_LINESTART then
        stb_textedit_clamp(str, state)
        stb_textedit_move_to_first(state)
        state.cursor = STB_TEXTEDIT_MOVELINESTART(str, state, state.cursor)
        state.has_preferred_x = false
    elseif key == STB_TEXTEDIT_K_LINEEND then
        stb_textedit_clamp(str, state)
        stb_textedit_move_to_last(str, state)
        state.cursor = STB_TEXTEDIT_MOVELINEEND(str, state, state.cursor)
        state.has_preferred_x = false
    elseif key == bit32.bor(STB_TEXTEDIT_K_LINESTART, STB_TEXTEDIT_K_SHIFT) then
        stb_textedit_clamp(str, state)
        stb_textedit_prep_selection_at_cursor(state)
        state.cursor = STB_TEXTEDIT_MOVELINESTART(str, state, state.cursor)
        state.select_end = state.cursor
        state.has_preferred_x = false
    elseif key == bit32.bor(STB_TEXTEDIT_K_LINEEND, STB_TEXTEDIT_K_SHIFT) then
        stb_textedit_clamp(str, state)
        stb_textedit_prep_selection_at_cursor(state)
        state.cursor = STB_TEXTEDIT_MOVELINEEND(str, state, state.cursor)
        state.select_end = state.cursor
        state.has_preferred_x = false
    end
end

end

-----------------------------------------------------
-----------------------------------------------------
---
--- Undo processing
--- OPTIMIZE: the undo/redo buffer should be circular
---

--- @param state StbUndoState
local function stb_textedit_flush_redo(state)
    state.redo_point = IMSTB_TEXTEDIT_UNDOSTATECOUNT + 1
    state.redo_char_point = IMSTB_TEXTEDIT_UNDOCHARCOUNT + 1
end

-- discard the oldest entry in the undo list
--- @param state StbUndoState
local function stb_textedit_discard_undo(state)
    if state.undo_point > 0 then
        -- if the 1th undo state has characters, clean those up
        if state.undo_rec[1].char_storage >= 0 then
            local n = state.undo_rec[1].insert_length
            -- delete n characters from all other records
            state.undo_char_point = state.undo_char_point - n
            IMSTB_TEXTEDIT_memmove(state.undo_char, 1, state.undo_char, n + 1, state.undo_char_point - 1)
            for i = 1, state.undo_point do
                if state.undo_rec[i].char_storage >= 0 then
                    state.undo_rec[i].char_storage = state.undo_rec[i].char_storage - n -- OPTIMIZE: get rid of char_storage and infer it
                end
            end
        end
        state.undo_point = state.undo_point - 1
        IMSTB_TEXTEDIT_memmove(state.undo_rec, 1, state.undo_rec, 2, state.undo_point - 1)
    end
end

-- discard the oldest entry in the redo list--it's bad if this
-- ever happens, but because undo & redo have to store the actual
-- characters in different cases, the redo character buffer can
-- fill up even though the undo buffer didn't
--- @param state StbUndoState
local function stb_textedit_discard_redo(state)
    local k = IMSTB_TEXTEDIT_UNDOSTATECOUNT

    if state.redo_point <= k then
        -- if the k'th undo state has characters, clean those up
        if state.undo_rec[k].char_storage >= 1 then
            local n = state.undo_rec[k].insert_length
            -- move the remaining redo character data to the end of the buffer
            state.redo_char_point = state.redo_char_point + n
            IMSTB_TEXTEDIT_memmove(state.undo_char, state.redo_char_point, state.undo_char, state.redo_char_point - n, IMSTB_TEXTEDIT_UNDOCHARCOUNT - state.redo_char_point + 1)
            -- adjust the position of all the other records to account for above memmove
            for i = state.redo_point, k - 1 do
                if state.undo_rec[i].char_storage >= 1 then
                    state.undo_rec[i].char_storage = state.undo_rec[i].char_storage + n
                end
            end
        end

        -- now move all the redo records towards the end of the buffer; the first one is at 'redo_point'
        -- [IMGUI]
        local move_size = IMSTB_TEXTEDIT_UNDOSTATECOUNT - state.redo_point - 1
        IMSTB_TEXTEDIT_memmove(state.undo_rec, state.redo_point + 1, state.undo_rec, state.redo_point, move_size)

        -- now move redo_point to point to the new one
        state.redo_point = state.redo_point + 1
    end
end

--- @param state    StbUndoState
--- @param numchars int
local function stb_text_create_undo_record(state, numchars)
    -- any time we create a new undo record, we discard redo
    stb_textedit_flush_redo(state)

    -- if we have no free records, we have to make room, by sliding the
    -- existing records down
    if state.undo_point == IMSTB_TEXTEDIT_UNDOSTATECOUNT then
        stb_textedit_discard_undo(state)
    end

    -- if the characters to store won't possibly fit in the buffer, we can't undo
    if numchars > IMSTB_TEXTEDIT_UNDOCHARCOUNT then
        state.undo_point = 1
        state.undo_char_point = 1
        return nil
    end

    -- if we don't have enough free characters in the buffer, we have to make room
    while state.undo_char_point + numchars > IMSTB_TEXTEDIT_UNDOCHARCOUNT do
        stb_textedit_discard_undo(state)
    end

    local ret = state.undo_rec[state.undo_point]
    state.undo_point = state.undo_point + 1
    return ret
end

--- @param state      StbUndoState
--- @param pos        int
--- @param insert_len int
--- @param delete_len int
--- @return int? # index into undostate.undo_char[]
local function stb_text_createundo(state, pos, insert_len, delete_len)
    local r = stb_text_create_undo_record(state, insert_len)
    if r == nil then
        return nil
    end

    r.where = pos
    r.insert_length = insert_len
    r.delete_length = delete_len

    if insert_len == 0 then
        r.char_storage = -1
        return nil
    else
        r.char_storage = state.undo_char_point
        state.undo_char_point = state.undo_char_point + insert_len
        return r.char_storage
    end
end

--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
function stb_text_undo(str, state)
    local s = state.undostate

    if s.undo_point == 1 then
        return
    end

    -- we need to do two things: apply the undo record, and create a redo record
    local u = s.undo_rec[s.undo_point - 1]
    local r = s.undo_rec[s.redo_point - 1]
    r.char_storage = -1

    r.insert_length = u.delete_length
    r.delete_length = u.insert_length
    r.where = u.where

    if u.delete_length > 0 then
        -- if the undo record says to delete characters, then the redo record will
        -- need to re-insert the characters that get deleted, so we need to store
        -- them.

        -- there are three cases:
        --    there's enough room to store the characters
        --    characters stored for *redoing* don't leave room for redo
        --    characters stored for *undoing* don't leave room for redo
        -- if the last is true, we have to bail

        if s.undo_char_point + u.delete_length > IMSTB_TEXTEDIT_UNDOCHARCOUNT then
            -- the undo records take up too much character space; there's no space to store the redo characters
            r.insert_length = 0
        else
            -- there's definitely room to store the characters eventually
            while s.undo_char_point + u.delete_length > s.redo_char_point do
                -- should never happen:
                if s.redo_point == IMSTB_TEXTEDIT_UNDOSTATECOUNT + 1 then
                    return
                end

                -- there's currently not enough room, so discard a redo record
                stb_textedit_discard_redo(s)
            end
            r = s.undo_rec[s.redo_point - 1]

            r.char_storage = s.redo_char_point - u.delete_length
            s.redo_char_point = s.redo_char_point - u.delete_length

            -- now save the characters
            for i = 0, u.delete_length - 1 do
                s.undo_char[r.char_storage + i] = STB_TEXTEDIT_GETCHAR(str, u.where + i)
            end
        end

        -- now we can carry out the deletion
        STB_TEXTEDIT_DELETECHARS(str, u.where, u.delete_length)
    end

    -- check type of recorded action:
    if u.insert_length > 0 then
        -- easy case: was a deletion, so we need to insert n characters
        u.insert_length = STB_TEXTEDIT_INSERTCHARS(str, u.where, s.undo_char, u.char_storage, u.insert_length)
        s.undo_char_point = s.undo_char_point - u.insert_length
    end

    state.cursor = u.where + u.insert_length

    s.undo_point = s.undo_point - 1
    s.redo_point = s.redo_point - 1
end

--- @param str   IMSTB_TEXTEDIT_STRING
--- @param state STB_TexteditState
function stb_text_redo(str, state)
    local s = state.undostate
    if s.undo_point == IMSTB_TEXTEDIT_UNDOSTATECOUNT + 1 then
        return
    end

    -- we need to do two things: apply the redo record, and create an undo record
    local u = s.undo_rec[s.undo_point]
    local r = s.undo_rec[s.redo_point]

    u.delete_length = r.insert_length
    u.insert_length = r.delete_length
    u.where = r.where
    u.char_storage = -1

    if r.delete_length > 0 then
        -- the redo record requires us to delete characters, so the undo record
        -- needs to store the characters
        if s.undo_char_point + u.insert_length > s.redo_char_point then
            u.insert_length = 0
            u.delete_length = 0
        else
            u.char_storage = s.undo_char_point
            s.undo_char_point = s.undo_char_point + u.insert_length

            for i = 0, u.insert_length - 1 do
                s.undo_char[u.char_storage + i] = STB_TEXTEDIT_GETCHAR(str, u.where + i)
            end
        end

        STB_TEXTEDIT_DELETECHARS(str, r.where, r.delete_length)
    end

    if r.insert_length ~= 0 then
        r.insert_length = STB_TEXTEDIT_INSERTCHARS(str, r.where, s.undo_char, r.char_storage, r.insert_length)
        s.redo_char_point = s.redo_char_point + r.insert_length
    end

    state.cursor = r.where + r.insert_length

    s.undo_point = s.undo_point + 1
    s.redo_point = s.redo_point + 1
end

--- @param state  STB_TexteditState
--- @param where  int
--- @param length int
function stb_text_makeundo_insert(state, where, length)
    stb_text_createundo(state.undostate, where, 0, length)
end

--- @param str    IMSTB_TEXTEDIT_STRING
--- @param state  STB_TexteditState
--- @param where  int
--- @param length int
function stb_text_makeundo_delete(str, state, where, length)
    local s = state.undostate
    local p = stb_text_createundo(s, where, length, 0)
    if p then
        for i = 0, length - 1 do
            s.undo_char[p + i] = STB_TEXTEDIT_GETCHAR(str, where + i)
        end
    end
end

--- @param str        IMSTB_TEXTEDIT_STRING
--- @param state      STB_TexteditState
--- @param where      int
--- @param old_length int
--- @param new_length int
function stb_text_makeundo_replace(str, state, where, old_length, new_length)
    local s = state.undostate
    local p = stb_text_createundo(s, where, old_length, new_length)
    if p then
        for i = 0, old_length - 1 do
            s.undo_char[p + i] = STB_TEXTEDIT_GETCHAR(str, where + i)
        end
    end
end

--- @param state          STB_TexteditState
--- @param is_single_line bool
local function stb_textedit_clear_state(state, is_single_line)
    state.undostate.undo_point = 1
    state.undostate.undo_char_point = 1
    state.undostate.redo_point = IMSTB_TEXTEDIT_UNDOSTATECOUNT + 1
    state.undostate.redo_char_point = IMSTB_TEXTEDIT_UNDOCHARCOUNT + 1
    state.select_end = 1
    state.select_start = 1
    state.cursor = 1
    state.has_preferred_x = false
    state.preferred_x = 0
    state.cursor_at_end_of_line = false
    state.initialized = true
    state.single_line = is_single_line
    state.insert_mode = false
    state.row_count_per_page = 0
end

return {
    click = stb_textedit_click,
    drag = stb_textedit_drag,
    createundo = stb_text_createundo,
    initialize_state = stb_textedit_clear_state,

    text = stb_textedit_text,
    key = stb_textedit_key,

    makeundo_replace = stb_text_makeundo_replace,

    clamp = stb_textedit_clamp,
    prep_selection_at_cursor = stb_textedit_prep_selection_at_cursor,
    cut = stb_textedit_cut,
    paste = stb_textedit_paste_internal,

    HAS_SELECTION = STB_TEXT_HAS_SELECTION
}
end

__FILES['imstb_truetype.lua'] = function()
--- ImGui Sincerely
-- This is a Lua port of original `imstb_truetype.h`

--- STBTT_RASTERIZER_VERSION == 2

local stbtt_fontinfo

local stbtt_InitFont
local stbtt_MakeGlyphBitmapSubpixelPrefilter
local stbtt_GetFontVMetrics
local stbtt__GetGlyphInfoT2
local stbtt__GetGlyphShapeT2
local stbtt_GetGlyphShape
local stbtt_GetGlyphBitmapBox
local stbtt_GetGlyphBitmapBoxSubpixel
local stbtt_GetGlyphHMetrics
local stbtt_GetFontOffsetForIndex
local stbtt_ScaleForPixelHeight
local stbtt_FindGlyphIndex

local STBTT_MAX_OVERSAMPLE = 8

--- @enum STBTT_PLATFORM_ID
local STBTT_PLATFORM_ID = {
    UNICODE   = 0,
    MAC       = 1,
    ISO       = 2,
    MICROSOFT = 3,
}

--- @enum STBTT_MS_EID
local STBTT_MS_EID = {
    SYMBOL       = 0,
    UNICODE_BMP  = 1,
    SHIFTJIS     = 2,
    UNICODE_FULL = 10
}

-- original enum doesn't have a name, so we name it
--- @enum STBTT_VTX
local STBTT_VTX = {
    MOVE = 1,
    LINE = 2,
    CURVE = 3,
    CUBIC = 4
}

local bit32 = bit32
local math = math

local STBTT_assert = assert
local STBTT_sort = table.sort
local STBTT_sqrt = math.sqrt
local STBTT_fabs = math.abs
local STBTT_ifloor = math.floor
local STBTT_iceil = math.ceil

local trunc = function(x)
    if x >= 0 then
        return math.floor(x)
    else
        return math.ceil(x)
    end
end

local function STBTT__NOTUSED(_) return end

--- @alias stbtt_int32 int

local stbtt_int32   = ImS32
local stbtt_uint32  = ImU32
local stbtt_int16   = ImS16
local stbtt_uint16  = ImU16
local stbtt_int8    = ImS8
local stbtt_uint8   = ImU8
local unsigned_char = stbtt_uint8

--- @class stbtt__buf
--- @field data?  table # 1-based byte table
--- @field offset int   # Every access to `data` will be offset by this
--- @field cursor int   # >= 0
--- @field size   int

--- @param initial_offset? int
--- @return stbtt__buf
--- @nodiscard
local function stbtt__buf(initial_offset)
    return {
        data   = nil,
        offset = initial_offset or 0,
        cursor = 0,
        size   = nil
    }
end

--- @class stbtt_fontinfo
--- @field userdata         any
--- @field data             table       # pointer to .ttf file
--- @field fontstart        int         # offset of start of font
--- @field numGlyphs        int         # number of glyphs, needed for range checking
--- @field loca             int         # table location as offset from start of .ttf
--- @field head             int         # table location as offset from start of .ttf
--- @field glyf             int         # table location as offset from start of .ttf
--- @field hhea             int         # table location as offset from start of .ttf
--- @field hmtx             int         # table location as offset from start of .ttf
--- @field kern             int         # table location as offset from start of .ttf
--- @field gpos             int         # table location as offset from start of .ttf
--- @field svg              int         # table location as offset from start of .ttf
--- @field index_map        int         # a cmap mapping for our chosen character encoding
--- @field indexToLocFormat int         # format needed to map from glyph index to glyph
--- @field cff              stbtt__buf  # cff font data
--- @field charstrings      stbtt__buf  # the charstring index
--- @field gsubrs           stbtt__buf  # global charstring subroutines index
--- @field subrs            stbtt__buf  # private charstring subroutines index
--- @field fontdicts        stbtt__buf  # array of font dicts
--- @field fdselect         stbtt__buf  # map from glyph to fontdict

--- @return stbtt_fontinfo
function stbtt_fontinfo()
    return {
        data      = nil,
        fontstart = nil,

        numGlyphs = nil,

        loca = nil,
        head = nil,
        glyf = nil,
        hhea = nil,
        hmtx = nil,
        kern = nil,
        gpos = nil,
        svg  = nil,

        index_map        = nil,
        indexToLocFormat = nil,

        cff         = nil,
        charstrings = nil,
        gsubrs      = nil,
        subrs       = nil,
        fontdicts   = nil,
        fdselect    = nil
    }
end

--- @class stbtt_vertex
--- @field x       int
--- @field y       int
--- @field cx      int
--- @field cy      int
--- @field cx1     int
--- @field cy1     int
--- @field type    int
--- @field padding int

--- @return stbtt_vertex
--- @nodiscard
local function stbtt_vertex()
    return {
        x       = nil,
        y       = nil,
        cx      = nil,
        cy      = nil,
        cx1     = nil,
        cy1     = nil,
        type    = nil,
        padding = nil
    }
end

--- @class stbtt__csctx
--- @field bounds       bool
--- @field started      bool
--- @field first_x      float
--- @field first_y      float
--- @field x            float
--- @field y            float
--- @field min_x        int
--- @field max_x        int
--- @field min_y        int
--- @field max_y        int
--- @field pvertices    stbtt_vertex[]
--- @field num_vertices int

--- @return stbtt__csctx
--- @nodiscard
local function stbtt__csctx()
    return {
        bounds  = false,
        started = false,
        first_x = nil,
        first_y = nil,
        x       = nil,
        y       = nil,
        min_x   = nil,
        max_x   = nil,
        min_y   = nil,
        max_y   = nil,

        pvertices    = nil,
        num_vertices = nil
    }
end

--- @param bounds bool
--- @return stbtt__csctx
--- @nodiscard
local function STBTT__CSCTX_INIT(bounds)
    local this = stbtt__csctx()

    this.bounds  = bounds
    this.started = false
    this.first_x = 0
    this.first_y = 0
    this.x       = 0
    this.y       = 0
    this.min_x   = 0
    this.max_x   = 0
    this.min_y   = 0
    this.max_y   = 0

    this.pvertices = nil
    this.num_vertices = 0

    return this
end

--- stbtt_kerningentry
--- stbtt_pack_range
--- stbtt_packedchar

--- @class stbtt__edge
--- @field x0     float
--- @field y0     float
--- @field x1     float
--- @field y1     float
--- @field invert bool

--- @return stbtt__edge
--- @nodiscard
local function stbtt__edge()
    return {
        x0 = nil,
        y0 = nil,
        x1 = nil,
        y1 = nil,
        invert = false
    }
end

--- @class stbtt__active_edge

--- @return stbtt__active_edge
--- @nodiscard
local function stbtt__active_edge()
    return {
        next = nil,
        fx = nil,
        fdx = nil,
        fdy = nil,
        direction = nil,
        sy = nil,
        ey = nil
    }
end

--- @return stbtt__active_edge
--- @nodiscard
local function stbtt__new_active(e, off_x, start_point)
    local z = stbtt__active_edge()
    local dxdy = (e.x1 - e.x0) / (e.y1 - e.y0)

    z.fdx = dxdy
    z.fdy = (dxdy ~= 0.0) and (1.0 / dxdy) or 0.0
    z.fx = e.x0 + dxdy * (start_point - e.y0)
    z.fx = z.fx - off_x
    z.direction = (e.invert) and 1.0 or -1.0
    z.sy = e.y0
    z.ey = e.y1
    z.next = nil

    return z
end

--- @class stbtt__bitmap
--- @field w      int
--- @field h      int
--- @field stride int
--- @field pixels unsigned_char[]

--- @return stbtt__bitmap
--- @nodiscard
local function stbtt__bitmap()
    return {
        w      = nil,
        h      = nil,
        stride = nil,
        pixels = nil
    }
end

--- @class stbtt__point
--- @field x number
--- @field y number

--- @return stbtt__point
--- @nodiscard
local function stbtt__point() return { x = nil, y = nil } end

----------------------------------------------
----------------------------------------------
---
--- stbtt__buf helpers to parse data from file
---
---

--- @param b stbtt__buf
local function stbtt__buf_get8(b)
    if b.cursor >= b.size then return 0 end
    local result = b.data[b.offset + b.cursor + 1]
    b.cursor = b.cursor + 1
    return result
end

--- @param b stbtt__buf
local function stbtt__buf_peek8(b)
    if b.cursor >= b.size then return 0 end
    return b.data[b.offset + b.cursor + 1]
end

--- @param b stbtt__buf
--- @param o int
local function stbtt__buf_seek(b, o)
    STBTT_assert(not (o > b.size or o < 0))
    if o > b.size or o < 0 then
        b.cursor = b.size
    else
        b.cursor = o
    end
end

--- @param b stbtt__buf
--- @param o int
local function stbtt__buf_skip(b, o)
    stbtt__buf_seek(b, b.cursor + o)
end

local function stbtt__buf_get(b, n)
    local v = 0
    STBTT_assert(n >= 1 and n <= 4)
    for _ = 1, n do
        v = bit32.bor(bit32.lshift(v, 8), stbtt__buf_get8(b))
    end
    return v
end

--- @param p?      table
--- @param size    int
--- @param offset? int
--- @return stbtt__buf
--- @nodiscard
local function stbtt__new_buf(p, size, offset)
    local r = stbtt__buf(offset)
    STBTT_assert(size < 0x40000000)
    r.data = p
    r.size = trunc(size)
    r.cursor = 0
    return r
end

--- @param b stbtt__buf
local function stbtt__buf_get16(b) return stbtt__buf_get(b, 2) end
--- @param b stbtt__buf
local function stbtt__buf_get32(b) return stbtt__buf_get(b, 4) end

--- @param b stbtt__buf
--- @param o int
--- @param s int
--- @return stbtt__buf
--- @nodiscard
local function stbtt__buf_range(b, o, s)
    local r = stbtt__new_buf(nil, 0)
    if (o < 0 or s < 0 or o > b.size or s > (b.size - o)) then
        return r
    end
    r.data = b.data
    r.offset = b.offset + o
    r.size = s
    return r
end

--- @param b stbtt__buf
local function stbtt__cff_get_index(b)
    local count, start, offsize
    start = b.cursor
    count = stbtt__buf_get16(b)
    if count > 0 then
        offsize = stbtt__buf_get8(b)
        STBTT_assert(offsize >= 1 and offsize <= 4)
        stbtt__buf_skip(b, count * offsize)
        stbtt__buf_skip(b, stbtt__buf_get(b, offsize) - 1)
    end
    return stbtt__buf_range(b, start, b.cursor - start)
end

--- @param b stbtt__buf
local function stbtt__cff_int(b)
    local b0 = stbtt__buf_get8(b)
    if b0 >= 32 and b0 <= 246 then return b0 - 139
    elseif b0 >= 247 and b0 <= 250 then return (b0 - 247) * 256 + stbtt__buf_get8(b) + 108
    elseif b0 >= 251 and b0 <= 254 then return -(b0 - 251) * 256 - stbtt__buf_get8(b) - 108
    elseif b0 == 28 then return stbtt__buf_get16(b)
    elseif b0 == 29 then return stbtt__buf_get32(b)
    end
    STBTT_assert(false)
    return 0
end

--- @param b stbtt__buf
local function stbtt__cff_skip_operand(b)
    local v
    local b0 = stbtt__buf_peek8(b)
    STBTT_assert(b0 >= 28)
    if b0 == 30 then
        stbtt__buf_skip(b, 1)
        while b.cursor < b.size do
            v = stbtt__buf_get8(b)
            if (bit32.band(v, 0xF) == 0xF or bit32.rshift(v, 4) == 0xF) then
                break
            end
        end
    else
        stbtt__cff_int(b)
    end
end

--- @param b stbtt__buf
--- @param key int
--- @return stbtt__buf
--- @nodiscard
local function stbtt__dict_get(b, key)
    stbtt__buf_seek(b, 0)
    while b.cursor < b.size do
        local start = b.cursor
        local _end, op
        while stbtt__buf_peek8(b) >= 28 do
            stbtt__cff_skip_operand(b)
        end
        _end = b.cursor
        op = stbtt__buf_get8(b)
        if op == 12 then op = bit32.bor(stbtt__buf_get8(b), 0x100) end
        if op == key then return stbtt__buf_range(b, start, _end - start) end
    end
    return stbtt__buf_range(b, 0, 0)
end

--- @param b        stbtt__buf
--- @param key      int
--- @param outcount int
--- @return int[]
--- @nodiscard
local function stbtt__dict_get_ints(b, key, outcount)
    local operands = stbtt__dict_get(b, key)
    local out = {}
    for i = 1, outcount do
        if operands.cursor >= operands.size then break end
        out[i] = stbtt__cff_int(operands)
    end
    return out
end

--- @param b stbtt__buf
local function stbtt__cff_index_count(b)
    stbtt__buf_seek(b, 0)
    return stbtt__buf_get16(b)
end

--- @param b stbtt__buf
--- @param i int
--- @return stbtt__buf
--- @nodiscard
local function stbtt__cff_index_get(b, i)
    local count, offsize, start, _end
    stbtt__buf_seek(b, 0)
    count = stbtt__buf_get16(b)
    offsize = stbtt__buf_get8(b)
    STBTT_assert(i >= 0 and i < count)
    STBTT_assert(offsize >= 1 and offsize <= 4)
    stbtt__buf_skip(b, i * offsize)
    start = stbtt__buf_get(b, offsize)
    _end = stbtt__buf_get(b, offsize)
    return stbtt__buf_range(b, 2 + (count + 1) * offsize + start, _end - start)
end

-------------------------------------
-------------------------------------
---
--- Accessors to parse data from file
---
---

--- UNIMPLEMENTED / UNUSED:
---     stbtt_IsGlyphEmpty
---     stbtt_GetKerningTableLength
---     stbtt_GetKerningTable
---     stbtt__GetGlyphKernInfoAdvance
---     stbtt__GetCoverageIndex
---     stbtt__GetGlyphClass
---     stbtt__GetGlyphGPOSInfoAdvance
---     stbtt_GetGlyphKernAdvance
---     stbtt_FindSVGDoc
---     stbtt_GetGlyphSVG
---     stbtt_GetCodepointSVG
---     stbtt_GetCodepointKernAdvance
---     stbtt_GetFontVMetricsOS2
---     stbtt_GetCodepointHMetrics
---     stbtt_ScaleForMappingEmToPixels
---     stbtt_GetFontBoundingBox
---     stbtt_GetCodepointBitmapBox
---     stbtt_GetCodepointBitmapBoxSubpixel
---     stbtt_GetCodepointBox
---     stbtt_GetNumberOfFonts_internal
---     stbtt__get_svg

local function ttUSHORT(p, offset) return stbtt_uint16(p[offset + 1] * 256 + p[offset + 2]) end
local function ttSHORT(p, offset)  return stbtt_int16(p[offset + 1] * 256 + p[offset + 2]) end
local function ttULONG(p, offset)  return stbtt_uint32(bit32.lshift(p[offset + 1], 24) + bit32.lshift(p[offset + 2], 16) + bit32.lshift(p[offset + 3], 8) + p[offset + 4]) end
local function ttLONG(p, offset)   return stbtt_int32(bit32.lshift(p[offset + 1], 24) + bit32.lshift(p[offset + 2], 16) + bit32.lshift(p[offset + 3], 8) + p[offset + 4]) end

local function ttBYTE(p, offset) return stbtt_uint8(p[offset + 1]) end
local function ttCHAR(p, offset) return stbtt_int8(p[offset + 1]) end

local function stbtt_tag4(p, c0, c1, c2, c3, offset) offset = offset or 0; return p[offset + 1] == c0 and p[offset + 2] == c1 and p[offset + 3] == c2 and p[offset + 4] == c3 end
local function stbtt_tag(p, str, offset) local c0, c1, c2, c3 = string.byte(str, 1, 4); return stbtt_tag4(p, c0, c1, c2, c3, offset) end

local function stbtt__isfont(font)
    if stbtt_tag4(font, 49, 0, 0, 0) then return true end
    if stbtt_tag(font, "typ1") then return true end
    if stbtt_tag(font, "OTTO") then return true end
    if stbtt_tag4(font, 0, 1, 0, 0) then return true end
    if stbtt_tag(font, "true") then return true end
    return false
end

local function stbtt__find_table(data, font_start, tag)
    local num_tables = ttUSHORT(data, font_start + 4)
    local tabledir = font_start + 12
    for i = 0, num_tables - 1 do
        local loc = tabledir + i * 16
        if stbtt_tag(data, tag, loc + 0) then
            return ttULONG(data, loc + 8)
        end
    end
    return 0
end

local function stbtt_GetFontOffsetForIndex_internal(font_collection, index)
    if stbtt__isfont(font_collection) then
        if index == 0 then return 0 else return -1 end
    end

    if stbtt_tag(font_collection, "ttcf") then
        if ttULONG(font_collection, 4) == 0x00010000 or ttULONG(font_collection, 4) == 0x00020000 then
            local n = ttLONG(font_collection, 8)
            if index >= n then
                return -1
            end
            return ttULONG(font_collection, 12 + index * 4)
        end
    end

    return -1
end

--- @param cff      stbtt__buf
--- @param fontdict stbtt__buf
local function stbtt__get_subrs(cff, fontdict)
    local private_loc = stbtt__dict_get_ints(fontdict, 18, 2)
    if (private_loc[2] == 0 or private_loc[1] == 0) then
        return stbtt__new_buf(nil, 0)
    end
    local pdict = stbtt__buf_range(cff, private_loc[2], private_loc[1])
    local subrsoff = stbtt__dict_get_ints(pdict, 19, 1)
    if subrsoff[1] == 0 then
        return stbtt__new_buf(nil, 0)
    end
    stbtt__buf_seek(cff, private_loc[2] + subrsoff[1])
    return stbtt__cff_get_index(cff)
end

--- @return bool
local function stbtt_InitFont_internal(info, data, fontstart)
    local cmap
    local numTables

    info.data = data
    info.fontstart = fontstart
    info.cff = stbtt__new_buf(nil, 0)

    cmap = stbtt__find_table(data, fontstart, "cmap")
    info.loca = stbtt__find_table(data, fontstart, "loca")
    info.head = stbtt__find_table(data, fontstart, "head")
    info.glyf = stbtt__find_table(data, fontstart, "glyf")
    info.hhea = stbtt__find_table(data, fontstart, "hhea")
    info.hmtx = stbtt__find_table(data, fontstart, "hmtx")
    info.kern = stbtt__find_table(data, fontstart, "kern")
    info.gpos = stbtt__find_table(data, fontstart, "GPOS")

    if (cmap == 0 or info.head == 0 or info.hhea == 0 or info.hmtx == 0) then
        return false
    end
    if info.glyf ~= 0 then
        if info.loca == 0 then
            return false
        end
    else
        local cff = stbtt__find_table(data, fontstart, "CFF ")
        if cff == 0 then
            return false
        end

        info.fontdicts = stbtt__new_buf(nil, 0)
        info.fdselect = stbtt__new_buf(nil, 0)

        info.cff = stbtt__new_buf(data, 64 * 1024 * 1024, cff) -- TODO: this should use size from table
        local b = info.cff

        -- read the header
        stbtt__buf_skip(b, 2)
        stbtt__buf_seek(b, stbtt__buf_get8(b))

        -- TODO: the name INDEX could list multiple fonts, but we just use the first one.
        stbtt__cff_get_index(b) -- name INDEX
        local topdictidx = stbtt__cff_get_index(b)
        local topdict = stbtt__cff_index_get(topdictidx, 0)
        stbtt__cff_get_index(b) -- string INDEX
        info.gsubrs = stbtt__cff_get_index(b)

        local charstrings = stbtt__dict_get_ints(topdict, 17, 1)
        local cstype      = stbtt__dict_get_ints(topdict, bit32.bor(0x100, 6), 1)
        local fdarrayoff  = stbtt__dict_get_ints(topdict, bit32.bor(0x100, 36), 1)
        local fdselectoff = stbtt__dict_get_ints(topdict, bit32.bor(0x100, 37), 1)
        info.subrs = stbtt__get_subrs(b, topdict)

        if cstype[1] ~= 2 then
            return false
        end
        if charstrings[1] == 0 then
            return false
        end

        if fdarrayoff[1] ~= 0 then
            if fdselectoff[1] == 0 then
                return false
            end

            stbtt__buf_seek(b, fdarrayoff[1])
            info.fontdicts = stbtt__cff_get_index(b)
            info.fdselect = stbtt__buf_range(b, fdselectoff[1], b.size - fdselectoff[1])
        end

        stbtt__buf_seek(b, charstrings[1])
        info.charstrings = stbtt__cff_get_index(b)
    end

    local t = stbtt__find_table(data, fontstart, "maxp")
    if t ~= 0 then
        info.numGlyphs = ttUSHORT(data, t + 4)
    else
        info.numGlyphs = 0xffff
    end

    info.svg = -1

    numTables = ttUSHORT(data, cmap + 2)
    info.index_map = 0
    for i = 0, numTables - 1 do
        local encoding_record = cmap + 4 + 8 * i
        local platform_id = ttUSHORT(data, encoding_record)

        if platform_id == STBTT_PLATFORM_ID.MICROSOFT then
            local ms_eid = ttUSHORT(data, encoding_record + 2)

            if ms_eid == STBTT_MS_EID.UNICODE_BMP or ms_eid == STBTT_MS_EID.UNICODE_FULL then
                info.index_map = cmap + ttULONG(data, encoding_record + 4)
            end
        elseif platform_id == STBTT_PLATFORM_ID.UNICODE then
            info.index_map = cmap + ttULONG(data, encoding_record + 4)
        end
    end
    if info.index_map == 0 then
        return false
    end

    info.indexToLocFormat = ttUSHORT(data, info.head + 50)
    return true
end

--- @param info              stbtt_fontinfo
--- @param unicode_codepoint int
function stbtt_FindGlyphIndex(info, unicode_codepoint)
    local data = info.data
    local index_map = info.index_map

    local format = ttUSHORT(data, index_map + 0)
    if format == 0 then
        local bytes = ttUSHORT(data, index_map + 2)
        if unicode_codepoint < bytes - 6 then
            return ttBYTE(data, index_map + 6 + unicode_codepoint)
        end
        return 0
    elseif format == 6 then
        local first = ttUSHORT(data, index_map + 6)
        local count = ttUSHORT(data, index_map + 8)
        if unicode_codepoint >= first and unicode_codepoint < first + count then
            return ttUSHORT(data, index_map + 10 + (unicode_codepoint - first) * 2)
        end
        return 0
    elseif format == 2 then
        STBTT_assert(false) -- TODO: high-byte mapping for japanese/chinese/korean
        return 0
    elseif format == 4 then
        local segcount = bit32.rshift(ttUSHORT(data, index_map + 6), 1)
        local searchRange = bit32.rshift(ttUSHORT(data, index_map + 8), 1)
        local entrySelector = ttUSHORT(data, index_map + 10)
        local rangeShift = bit32.rshift(ttUSHORT(data, index_map + 12), 1)

        local endCount = index_map + 14
        local search = endCount

        if unicode_codepoint > 0xffff then
            return 0
        end

        if unicode_codepoint >= ttUSHORT(data, search + rangeShift * 2) then
            search = search + rangeShift * 2
        end

        search = search - 2
        while entrySelector ~= 0 do
            searchRange = bit32.rshift(searchRange, 1)
            local _end = ttUSHORT(data, search + searchRange * 2)
            if unicode_codepoint > _end then
                search = search + searchRange * 2
            end
            entrySelector = entrySelector - 1
        end
        search = search + 2

        do
            local item = stbtt_uint16(bit32.rshift(search - endCount, 1))

            local start = ttUSHORT(data, index_map + 14 + segcount * 2 + 2 + 2 * item)
            local last = ttUSHORT(data, endCount + 2 * item)
            if unicode_codepoint < start or unicode_codepoint > last then
                return 0
            end

            local offset = ttUSHORT(data, index_map + 14 + segcount * 6 + 2 + 2 * item)
            if offset == 0 then
                return stbtt_uint16(unicode_codepoint + ttSHORT(data, index_map + 14 + segcount * 4 + 2 + 2 * item))
            end

            return ttUSHORT(data, offset + (unicode_codepoint - start) * 2 + index_map + 14 + segcount * 6 + 2 + 2 * item)
        end
    elseif format == 12 or format == 13 then
        local ngroups = ttULONG(data, index_map + 12)
        local low = 0
        local high = ngroups
        while low < high do
            local mid = low + bit32.rshift(high - low, 1)
            local start_char = ttULONG(data, index_map + 16 + mid * 12)
            local end_char = ttULONG(data, index_map + 16 + mid * 12 + 4)
            if unicode_codepoint < start_char then
                high = mid
            elseif unicode_codepoint > end_char then
                low = mid + 1
            else
                local start_glyph = ttULONG(data, index_map + 16 + mid * 12 + 8)
                if format == 12 then
                    return start_glyph + unicode_codepoint - start_char
                else -- format == 13
                    return start_glyph
                end
            end
        end
        return 0
    end

    -- TODO:
    STBTT_assert(false)
    return 0
end

--- @param v        stbtt_vertex
--- @param vtx_type STBTT_VTX
--- @param x        stbtt_int32
--- @param y        stbtt_int32
--- @param cx       stbtt_int32
--- @param cy       stbtt_int32
local function stbtt_setvertex(v, vtx_type, x, y, cx, cy)
    v.type = vtx_type
    v.x = (stbtt_int16)(x)
    v.y = (stbtt_int16)(y)
    v.cx = (stbtt_int16)(cx)
    v.cy = (stbtt_int16)(cy)
end

local function stbtt__GetGlyfOffset(info, glyph_index)
    STBTT_assert(info.cff.size == 0)

    if glyph_index >= info.numGlyphs then return -1 end
    if info.indexToLocFormat >= 2 then return -1 end

    local g1, g2
    if info.indexToLocFormat == 0 then
        g1 = info.glyf + ttUSHORT(info.data, info.loca + glyph_index * 2) * 2
        g2 = info.glyf + ttUSHORT(info.data, info.loca + glyph_index * 2 + 2) * 2
    else
        g1 = info.glyf + ttULONG(info.data, info.loca + glyph_index * 4)
        g2 = info.glyf + ttULONG(info.data, info.loca + glyph_index * 4 + 4)
    end

    if g1 == g2 then return -1 else return g1 end
end

--- @return integer, integer?, integer?, integer?, integer?
local function stbtt_GetGlyphBox(info, glyph_index)
    local n, x0, y0, x1, y1

    if info.cff.size ~= 0 then
        n, x0, y0, x1, y1 = stbtt__GetGlyphInfoT2(info, glyph_index)
    else
        local g = stbtt__GetGlyfOffset(info, glyph_index)
        if g < 0 then return 0 end

        x0 = ttSHORT(info.data, g + 2)
        y0 = ttSHORT(info.data, g + 4)
        x1 = ttSHORT(info.data, g + 6)
        y1 = ttSHORT(info.data, g + 8)
    end

    return 1, x0, y0, x1, y1
end

--- @param vertices     stbtt_vertex[]
--- @param num_vertices int
--- @param was_off      bool
--- @param start_off    bool
--- @param sx           stbtt_int32
--- @param sy           stbtt_int32
--- @param scx          stbtt_int32
--- @param scy          stbtt_int32
--- @param cx           stbtt_int32
--- @param cy           stbtt_int32
local function stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx, sy, scx, scy, cx, cy)
    if start_off then
        if was_off then
            stbtt_setvertex(vertices[num_vertices + 1], STBTT_VTX.CURVE, bit32.rshift(cx + scx, 1), bit32.rshift(cy + scy, 1), cx, cy)
            num_vertices = num_vertices + 1
        end
        stbtt_setvertex(vertices[num_vertices + 1], STBTT_VTX.CURVE, sx, sy, scx, scy)
        num_vertices = num_vertices + 1
    else
        if was_off then
            stbtt_setvertex(vertices[num_vertices + 1], STBTT_VTX.CURVE, sx, sy, cx, cy)
            num_vertices = num_vertices + 1
        else
            stbtt_setvertex(vertices[num_vertices + 1], STBTT_VTX.LINE, sx, sy, 0, 0)
            num_vertices = num_vertices + 1
        end
    end
    return num_vertices
end

--- @param info        stbtt_fontinfo
--- @param glyph_index int
--- @return int             num_vertices
--- @return stbtt_vertex[]? vertices
local function stbtt__GetGlyphShapeTT(info, glyph_index)
    local data = info.data
    local num_vertices

    local vertices = nil

    local g = stbtt__GetGlyfOffset(info, glyph_index)

    if g < 0 then return 0 end

    local numberOfContours = ttSHORT(data, g)

    if numberOfContours > 0 then
        local endPtsOfContours = g + 10
        local ins = ttUSHORT(data, endPtsOfContours + numberOfContours * 2)
        local points = (endPtsOfContours + numberOfContours * 2 + 2 + ins) + 1 -- 1-based idx

        local n = 1 + ttUSHORT(data, endPtsOfContours + numberOfContours * 2 - 2)
        local m = n + 2 * numberOfContours

        vertices = {}
        for i = 1, m do vertices[i] = stbtt_vertex() end

        local j = 0
        local was_off = false
        local start_off = false
        local next_move = 0
        local flagcount = 0

        local off = m - n

        -- first load flags
        local flags = 0
        for i = 1, n do
            if flagcount == 0 then
                flags = data[points]
                points = points + 1

                if bit32.band(flags, 8) ~= 0 then
                    flagcount = data[points]
                    points = points + 1
                end
            else
                flagcount = flagcount - 1
            end

            vertices[off + i].type = flags
        end

        -- now load x coordinates
        local x = 0
        for i = 1, n do
            flags = vertices[off + i].type
            if bit32.band(flags, 2) ~= 0 then
                local dx = data[points]
                points = points + 1
                if bit32.band(flags, 16) ~= 0 then
                    x = x + dx
                else
                    x = x - dx
                end
            else
                if bit32.band(flags, 16) == 0 then
                    x = x + stbtt_int16(data[points] * 256 + data[points + 1])
                    points = points + 2
                end
            end

            vertices[off + i].x = stbtt_int16(x)
        end

        -- now load y coordinates
        local y = 0
        for i = 1, n do
            flags = vertices[off + i].type
            if bit32.band(flags, 4) ~= 0 then
                local dy = data[points]
                points = points + 1
                if bit32.band(flags, 32) ~= 0 then
                    y = y + dy
                else
                    y = y - dy
                end
            else
                if bit32.band(flags, 32) == 0 then
                    y = y + stbtt_int16(data[points] * 256 + data[points + 1])
                    points = points + 2
                end
            end

            vertices[off + i].y = stbtt_int16(y)
        end

        -- now convert them to our format
        num_vertices = 0
        local sx, sy, cx, cy, scx, scy = 0, 0, 0, 0, 0, 0
        for i = 1, n do
            flags = vertices[off + i].type
            x = stbtt_int16(vertices[off + i].x)
            y = stbtt_int16(vertices[off + i].y)

            if next_move == i - 1 then
                if i ~= 1 then
                    num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx, sy, scx, scy, cx, cy)
                end

                -- now start the new one
                start_off = (bit32.band(flags, 1) == 0)
                if start_off then
                    scx = x
                    scy = y
                    if bit32.band(vertices[off + i + 1].type, 1) == 0 then
                        sx = bit32.rshift(x + stbtt_int32(vertices[off + i + 1].x), 1)
                        sy = bit32.rshift(y + stbtt_int32(vertices[off + i + 1].y), 1)
                    else
                        sx = stbtt_int32(vertices[off + i + 1].x)
                        sy = stbtt_int32(vertices[off + i + 1].y)
                        i = i + 1
                    end
                else
                    sx = x
                    sy = y
                end
                stbtt_setvertex(vertices[num_vertices + 1], STBTT_VTX.MOVE, sx, sy, 0, 0)
                num_vertices = num_vertices + 1
                was_off = false
                next_move = 1 + ttUSHORT(data, endPtsOfContours + j * 2)
                j = j + 1
            else
                if bit32.band(flags, 1) == 0 then
                    if was_off then
                        stbtt_setvertex(vertices[num_vertices + 1], STBTT_VTX.CURVE, bit32.rshift(cx + x, 1), bit32.rshift(cy + y, 1), cx, cy)
                        num_vertices = num_vertices + 1
                    end

                    cx = x
                    cy = y
                    was_off = true
                else
                    if was_off then
                        stbtt_setvertex(vertices[num_vertices + 1], STBTT_VTX.CURVE, x, y, cx, cy)
                        num_vertices = num_vertices + 1
                    else
                        stbtt_setvertex(vertices[num_vertices + 1], STBTT_VTX.LINE, x, y, 0, 0)
                        num_vertices = num_vertices + 1
                    end

                    was_off = false
                end
            end
        end

        num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx, sy, scx, scy, cx, cy)
    elseif numberOfContours < 0 then
        local more = 1
        local comp = g + 10
        num_vertices = 0

        while more ~= 0 do
            local flags, gidx
            local comp_num_vertices = 0
            local comp_verts

            local mtx = {1, 0, 0, 1, 0, 0}
            local m, n

            flags = ttSHORT(data, comp) comp = comp + 2
            gidx = ttSHORT(data, comp) comp = comp + 2

            if bit32.band(flags, 2) ~= 0 then
                if bit32.band(flags, 1) ~= 0 then
                    mtx[5] = ttSHORT(data, comp) comp = comp + 2
                    mtx[6] = ttSHORT(data, comp) comp = comp + 2
                else
                    mtx[5] = ttCHAR(data, comp) comp = comp + 1
                    mtx[6] = ttCHAR(data, comp) comp = comp + 1
                end
            else
                -- TODO: handle matching point
                STBTT_assert(false)
            end

            if bit32.band(flags, bit32.lshift(1, 3)) ~= 0 then -- WE_HAVE_A_SCALE
                mtx[4] = ttSHORT(data, comp) / 16384.0
                mtx[1] = mtx[4]
                comp = comp + 2

                mtx[3] = 0
                mtx[2] = mtx[3]
            elseif bit32.band(flags, bit32.lshift(1, 6)) ~= 0 then -- WE_HAVE_AN_X_AND_YSCALE
                mtx[1] = ttSHORT(data, comp) / 16384.0
                comp = comp + 2

                mtx[3] = 0
                mtx[2] = mtx[3]

                mtx[4] = ttSHORT(data, comp) / 16384.0
                comp = comp + 2
            elseif bit32.band(flags, bit32.lshift(1, 7)) ~= 0 then -- WE_HAVE_A_TWO_BY_TWO
                mtx[1] = ttSHORT(data, comp) / 16384.0 comp = comp + 2
                mtx[2] = ttSHORT(data, comp) / 16384.0 comp = comp + 2
                mtx[3] = ttSHORT(data, comp) / 16384.0 comp = comp + 2
                mtx[4] = ttSHORT(data, comp) / 16384.0 comp = comp + 2
            end

            m = STBTT_sqrt(mtx[1] * mtx[1] + mtx[2] * mtx[2])
            n = STBTT_sqrt(mtx[3] * mtx[3] + mtx[4] * mtx[4])

            comp_num_vertices, comp_verts = stbtt_GetGlyphShape(info, gidx)
            if comp_num_vertices > 0 then
                for i = 1, comp_num_vertices do
                    local v = comp_verts[i]
                    local x = v.x
                    local y = v.y
                    v.x = stbtt_int16(m * (mtx[1] * x + mtx[3] * y + mtx[5]))
                    v.y = stbtt_int16(n * (mtx[2] * x + mtx[4] * y + mtx[6]))
                    x = v.cx
                    y = v.cy
                    v.cx = stbtt_int16(m * (mtx[1] * x + mtx[3] * y + mtx[5]))
                    v.cy = stbtt_int16(n * (mtx[2] * x + mtx[4] * y + mtx[6]))
                end

                if num_vertices == 0 then -- LUA: No malloc
                    vertices = comp_verts
                else
                    for i = 1, comp_num_vertices do
                        vertices[num_vertices + i] = comp_verts[i]
                    end
                end

                num_vertices = num_vertices + comp_num_vertices
            end

            more = bit32.band(flags, bit32.lshift(1, 5))
        end
    end

    return num_vertices, vertices
end

--- @param c stbtt__csctx
--- @param x stbtt_int32
--- @param y stbtt_int32
local function stbtt__track_vertex(c, x, y)
    if x > c.max_x or not c.started then c.max_x = x end
    if y > c.max_y or not c.started then c.max_y = y end
    if x < c.min_x or not c.started then c.min_x = x end
    if y < c.min_y or not c.started then c.min_y = y end
    c.started = true
end

--- @param c        stbtt__csctx
--- @param vtx_type STBTT_VTX
--- @param x        stbtt_int32
--- @param y        stbtt_int32
--- @param cx       stbtt_int32
--- @param cy       stbtt_int32
--- @param cx1      stbtt_int32
--- @param cy1      stbtt_int32
local function stbtt__csctx_v(c, vtx_type, x, y, cx, cy, cx1, cy1)
    if c.bounds then
        stbtt__track_vertex(c, x, y)
        if vtx_type == STBTT_VTX.CUBIC then
            stbtt__track_vertex(c, cx, cy)
            stbtt__track_vertex(c, cx1, cy1)
        end
    else
        stbtt_setvertex(c.pvertices[c.num_vertices + 1], vtx_type, x, y, cx, cy)
        c.pvertices[c.num_vertices + 1].cx1 = stbtt_int16(cx1)
        c.pvertices[c.num_vertices + 1].cy1 = stbtt_int16(cy1)
    end
end

--- @param ctx stbtt__csctx
local function stbtt__csctx_close_shape(ctx)
    if ctx.first_x ~= ctx.x or ctx.first_y ~= ctx.y then
        stbtt__csctx_v(ctx, STBTT_VTX.LINE, trunc(ctx.first_x), trunc(ctx.first_y), 0, 0, 0, 0)
    end
end

--- @param ctx stbtt__csctx
--- @param dx  float
--- @param dy  float
local function stbtt__csctx_rmove_to(ctx, dx, dy)
    stbtt__csctx_close_shape(ctx)
    ctx.x = ctx.x + dx
    ctx.first_x = ctx.x
    ctx.y = ctx.y + dy
    ctx.first_y = ctx.y
    stbtt__csctx_v(ctx, STBTT_VTX.MOVE, trunc(ctx.x), trunc(ctx.y), 0, 0, 0, 0)
end

--- @param ctx stbtt__csctx
--- @param dx  float
--- @param dy  float
local function stbtt__csctx_rline_to(ctx, dx, dy)
    ctx.x = ctx.x + dx
    ctx.y = ctx.y + dy
    stbtt__csctx_v(ctx, STBTT_VTX.LINE, trunc(ctx.x), trunc(ctx.y), 0, 0, 0, 0)
end

--- @param ctx stbtt__csctx
--- @param dx1 float
--- @param dy1 float
--- @param dx2 float
--- @param dy2 float
--- @param dx3 float
--- @param dy3 float
local function stbtt__csctx_rccurve_to(ctx, dx1, dy1, dx2, dy2, dx3, dy3)
    local cx1 = ctx.x + dx1
    local cy1 = ctx.y + dy1
    local cx2 = cx1 + dx2
    local cy2 = cy1 + dy2
    ctx.x = cx2 + dx3
    ctx.y = cy2 + dy3
    stbtt__csctx_v(ctx, STBTT_VTX.CUBIC, trunc(ctx.x), trunc(ctx.y), trunc(cx1), trunc(cy1), trunc(cx2), trunc(cy2))
end

local function stbtt__get_subr(idx, n)
    local count = stbtt__cff_index_count(idx)
    local bias = 107
    if count >= 33900 then
        bias = 32768
    elseif count >= 1240 then
        bias = 1131
    end
    n = n + bias
    if n < 0 or n >= count then
        return stbtt__new_buf(nil, 0)
    end
    return stbtt__cff_index_get(idx, n)
end

local function stbtt__cid_get_glyph_subrs(info, glyph_index)
    local fdselect = info.fdselect
    local fdselector = -1

    stbtt__buf_seek(fdselect, 0)
    local fmt = stbtt__buf_get8(fdselect)
    if fmt == 0 then
        -- untested
        stbtt__buf_skip(fdselect, glyph_index)
        fdselector = stbtt__buf_get8(fdselect)
    elseif fmt == 3 then
        local nranges = stbtt__buf_get16(fdselect)
        local start = stbtt__buf_get16(fdselect)
        for i = 0, nranges - 1 do
            local v = stbtt__buf_get8(fdselect)
            local _end = stbtt__buf_get16(fdselect)
            if glyph_index >= start and glyph_index < _end then
                fdselector = v
                break
            end
            start = _end
        end
    end
    if fdselector == -1 then return stbtt__new_buf(nil, 0) end -- [DEAR IMGUI] fixed, see #6007 and nothings/stb#1422
    return stbtt__get_subrs(info.cff, stbtt__cff_index_get(info.fontdicts, fdselector))
end

--- @param info        stbtt_fontinfo
--- @param glyph_index int
--- @param c           stbtt__csctx
local function stbtt__run_charstring(info, glyph_index, c)
    local in_header = true
    local maskbits = 0
    local subr_stack_height = 0
    local sp = 0
    local has_subrs = 0
    local clear_stack

    local s = {} -- size = 48, 0-based

    local subr_stack = {} for i = 1, 10 do subr_stack[i] = stbtt__buf() end

    local subrs = info.subrs
    local b, f

    local function STBTT__CSERR(_s) return 0 end

    -- this currently ignores the initial width value, which isn't needed if we have hmtx
    b = stbtt__cff_index_get(info.charstrings, glyph_index)
    local i, v, b0
    while b.cursor < b.size do
        i = 0
        clear_stack = 1
        b0 = stbtt__buf_get8(b)

        -- TODO: implement hinting
        if b0 == 0x13 or b0 == 0x14 then -- hintmask or cntrmask
            if in_header then
                maskbits = maskbits + trunc(sp / 2)  -- implicit "vstem"
            end
            in_header = false
            stbtt__buf_skip(b, trunc((maskbits + 7) / 8))
        elseif b0 == 0x01 or b0 == 0x03 or b0 == 0x12 or b0 == 0x17 then -- hstem, vstem, hstemhm, vstemhm
            maskbits = maskbits + trunc(sp / 2)
        elseif b0 == 0x15 then -- rmoveto
            in_header = false
            if sp < 2 then return STBTT__CSERR("rmoveto stack") end
            stbtt__csctx_rmove_to(c, s[sp - 2], s[sp - 1])
        elseif b0 == 0x04 then -- vmoveto
            in_header = false
            if sp < 1 then return STBTT__CSERR("vmoveto stack") end
            stbtt__csctx_rmove_to(c, 0, s[sp - 1])
        elseif b0 == 0x16 then -- hmoveto
            in_header = false
            if sp < 1 then return STBTT__CSERR("hmoveto stack") end
            stbtt__csctx_rmove_to(c, s[sp - 1], 0)
        elseif b0 == 0x05 then -- rlineto
            if sp < 2 then return STBTT__CSERR("rlineto stack") end
            while i + 1 < sp do
                stbtt__csctx_rline_to(c, s[i], s[i + 1])
                i = i + 2
            end

        -- hlineto/vlineto and vhcurveto/hvcurveto alternate horizontal and vertical
        -- starting from a different place.

        elseif b0 == 0x07 then -- vlineto
            if sp < 1 then return STBTT__CSERR("vlineto stack") end
            while true do
                if i >= sp then break end
                stbtt__csctx_rline_to(c, 0, s[i])
                i = i + 1
                if i >= sp then break end
                stbtt__csctx_rline_to(c, s[i], 0)
                i = i + 1
            end
        elseif b0 == 0x06 then -- hlineto
            if sp < 1 then return STBTT__CSERR("hlineto stack") end

            while true do
                if i >= sp then break end
                stbtt__csctx_rline_to(c, s[i], 0)
                i = i + 1
            -- vlineto
                if i >= sp then break end
                stbtt__csctx_rline_to(c, 0, s[i])
                i = i + 1
            end
        elseif b0 == 0x1F then -- hvcurveto
            if sp < 4 then return STBTT__CSERR("hvcurveto stack") end
            while true do
                if i + 3 >= sp then break end
                stbtt__csctx_rccurve_to(c, s[i], 0, s[i + 1], s[i + 2], ((sp - i) == 5) and s[i + 4] or 0.0, s[i + 3])
                i = i + 4
                if i + 3 >= sp then break end
                stbtt__csctx_rccurve_to(c, 0, s[i], s[i + 1], s[i + 2], s[i + 3], ((sp - i) == 5) and s[i + 4] or 0.0)
                i = i + 4
            end
        elseif b0 == 0x1E then -- vhcurveto
            if sp < 4 then return STBTT__CSERR("vhcurveto stack") end

            while true do
                if i + 3 >= sp then break end
                stbtt__csctx_rccurve_to(c, 0, s[i], s[i + 1], s[i + 2], s[i + 3], ((sp - i) == 5) and s[i + 4] or 0.0)
                i = i + 4
            -- hvcurveto
                if i + 3 >= sp then break end
                stbtt__csctx_rccurve_to(c, s[i], 0, s[i + 1], s[i + 2], ((sp - i) == 5) and s[i + 4] or 0.0, s[i + 3])
                i = i + 4
            end
        elseif b0 == 0x08 then -- rrcurveto
            if sp < 6 then return STBTT__CSERR("rcurveline stack") end

            while i + 5 < sp do
                stbtt__csctx_rccurve_to(c, s[i], s[i + 1], s[i + 2], s[i + 3], s[i + 4], s[i + 5])
                i = i + 6
            end
        elseif b0 == 0x18 then -- rcurveline
            if sp < 8 then return STBTT__CSERR("rcurveline stack") end

            while i + 5 < sp - 2 do
                stbtt__csctx_rccurve_to(c, s[i], s[i + 1], s[i + 2], s[i + 3], s[i + 4], s[i + 5])
                i = i + 6
            end
            if i + 1 >= sp then return STBTT__CSERR("rcurveline stack") end
            stbtt__csctx_rline_to(c, s[i], s[i + 1])
        elseif b0 == 0x19 then -- rlinecurve
            if sp < 8 then return STBTT__CSERR("rlinecurve stack") end

            while i + 1 < sp - 6 do
                stbtt__csctx_rline_to(c, s[i], s[i + 1])
                i = i + 2
            end
            if i + 5 >= sp then return STBTT__CSERR("rlinecurve stack") end
            stbtt__csctx_rccurve_to(c, s[i], s[i + 1], s[i + 2], s[i + 3], s[i + 4], s[i + 5])
        elseif b0 == 0x1A or b0 == 0x1B then -- vvcurveto or hhcurveto
            if sp < 4 then return STBTT__CSERR("(vv|hh)curveto stack") end
            f = 0.0

            if bit32.band(sp, 1) ~= 0 then
                f = s[i]
                i = i + 1
            end
            while i + 3 < sp do
                if b0 == 0x1B then
                    stbtt__csctx_rccurve_to(c, s[i], f, s[i + 1], s[i + 2], s[i + 3], 0.0)
                else
                    stbtt__csctx_rccurve_to(c, f, s[i], s[i + 1], s[i + 2], 0.0, s[i + 3])
                end
                f = 0.0
                i = i + 4
            end
        elseif b0 == 0x0A -- callsubr
            or b0 == 0x1D then

            if b0 == 0x0A and has_subrs == 0 then
                if info.fdselect.size ~= 0 then
                    subrs = stbtt__cid_get_glyph_subrs(info, glyph_index)
                end
                has_subrs = 1
            end

            -- callgsubr
            if sp < 1 then return STBTT__CSERR("call(g|)subr stack") end
            sp = sp - 1
            v = trunc(s[sp])
            if subr_stack_height >= 10 then return STBTT__CSERR("recursion limit") end
            subr_stack[subr_stack_height + 1] = b
            subr_stack_height = subr_stack_height + 1
            b = stbtt__get_subr((b0 == 0x0A) and subrs or info.gsubrs, v)
            if b.size == 0 then return STBTT__CSERR("subr not found") end
            b.cursor = 0
            clear_stack = 0
        elseif b0 == 0x0B then -- return
            if subr_stack_height <= 0 then return STBTT__CSERR("return outside subr") end
            subr_stack_height = subr_stack_height - 1
            b = subr_stack[subr_stack_height + 1]
            clear_stack = 0
        elseif b0 == 0x0E then -- endchar
            stbtt__csctx_close_shape(c)
            return 1
        elseif b0 == 0x0C then -- two-byte escape
            local b1 = stbtt__buf_get8(b)

            if b1 == 0x22 then -- hflex
                if sp < 7 then return STBTT__CSERR("hflex stack") end
                local dx1 = s[0]
                local dx2 = s[1]
                local dy2 = s[2]
                local dx3 = s[3]
                local dx4 = s[4]
                local dx5 = s[5]
                local dx6 = s[6]
                stbtt__csctx_rccurve_to(c, dx1, 0, dx2, dy2, dx3, 0)
                stbtt__csctx_rccurve_to(c, dx4, 0, dx5, -dy2, dx6, 0)
            elseif b1 == 0x23 then -- flex
                if sp < 13 then return STBTT__CSERR("flex stack") end
                local dx1 = s[0]
                local dy1 = s[1]
                local dx2 = s[2]
                local dy2 = s[3]
                local dx3 = s[4]
                local dy3 = s[5]
                local dx4 = s[6]
                local dy4 = s[7]
                local dx5 = s[8]
                local dy5 = s[9]
                local dx6 = s[10]
                local dy6 = s[11]
                -- fd is s[12]
                stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3)
                stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6)
            elseif b1 == 0x24 then -- hflex1
                if sp < 9 then return STBTT__CSERR("hflex1 stack") end
                local dx1 = s[0]
                local dy1 = s[1]
                local dx2 = s[2]
                local dy2 = s[3]
                local dx3 = s[4]
                local dx4 = s[5]
                local dx5 = s[6]
                local dy5 = s[7]
                local dx6 = s[8]
                stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, 0)
                stbtt__csctx_rccurve_to(c, dx4, 0, dx5, dy5, dx6, -(dy1 + dy2 + dy5))
            elseif b1 == 0x25 then -- flex1
                if sp < 11 then return STBTT__CSERR("flex1 stack") end
                local dx1 = s[0]
                local dy1 = s[1]
                local dx2 = s[2]
                local dy2 = s[3]
                local dx3 = s[4]
                local dy3 = s[5]
                local dx4 = s[6]
                local dy4 = s[7]
                local dx5 = s[8]
                local dy5 = s[9]
                local dx6 = s[10]
                local dy6 = s[10]
                local dx = dx1 + dx2 + dx3 + dx4 + dx5
                local dy = dy1 + dy2 + dy3 + dy4 + dy5
                if STBTT_fabs(dx) > STBTT_fabs(dy) then
                    dy6 = -dy
                else
                    dx6 = -dx
                end
                stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3)
                stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6)
            else
                return STBTT__CSERR("unimplemented")
            end
        else
            if b0 ~= 255 and b0 ~= 28 and b0 < 32 then
                return STBTT__CSERR("reserved operator")
            end

            -- push immediate
            if b0 == 255 then
                f = stbtt__buf_get32(b) / 0x10000
            else
                stbtt__buf_skip(b, -1)
                f = stbtt_int16(stbtt__cff_int(b))
            end
            if sp >= 48 then return STBTT__CSERR("push stack overflow") end
            s[sp] = f
            sp = sp + 1
            clear_stack = 0
        end

        if clear_stack ~= 0 then
            sp = 0
        end
    end

    return STBTT__CSERR("no endchar")
end

--- @param info        stbtt_fontinfo
--- @param glyph_index int
--- @return int             num_vertices
--- @return stbtt_vertex[]? vertices
function stbtt__GetGlyphShapeT2(info, glyph_index)
    -- runs the charstring twice, once to count and once to output (to avoid realloc)
    local vertices = nil
    local count_ctx = STBTT__CSCTX_INIT(true)
    local output_ctx = STBTT__CSCTX_INIT(false)
    if stbtt__run_charstring(info, glyph_index, count_ctx) ~= 0 then
        vertices = {} for i = 1, count_ctx.num_vertices do vertices[i] = stbtt_vertex() end

        output_ctx.pvertices = vertices
        if stbtt__run_charstring(info, glyph_index, output_ctx) ~= 0 then
            STBTT_assert(output_ctx.num_vertices == count_ctx.num_vertices)
            return output_ctx.num_vertices, vertices
        end
    end

    return 0, vertices
end

--- @param info        stbtt_fontinfo
--- @param glyph_index int
--- @return int
--- @return int x0
--- @return int y0
--- @return int x1
--- @return int y1
function stbtt__GetGlyphInfoT2(info, glyph_index)
    local c = STBTT__CSCTX_INIT(true)
    local r = stbtt__run_charstring(info, glyph_index, c)
    local x0 = (r ~= 0) and c.min_x or 0
    local y0 = (r ~= 0) and c.min_y or 0
    local x1 = (r ~= 0) and c.max_x or 0
    local y1 = (r ~= 0) and c.max_y or 0
    return ((r ~= 0) and c.num_vertices or 0), x0, y0, x1, y1
end

--- @param info        stbtt_fontinfo
--- @param glyph_index int
function stbtt_GetGlyphShape(info, glyph_index)
    if info.cff.size == 0 then
        return stbtt__GetGlyphShapeTT(info, glyph_index)
    else
        return stbtt__GetGlyphShapeT2(info, glyph_index)
    end
end

--- @param info        stbtt_fontinfo
--- @param glyph_index int
function stbtt_GetGlyphHMetrics(info, glyph_index)
    local numOfLongHorMetrics = ttUSHORT(info.data, info.hhea + 34)

    local advanceWidth, leftSideBearing
    if glyph_index < numOfLongHorMetrics then
        advanceWidth = ttSHORT(info.data, info.hmtx + 4 * glyph_index)
        leftSideBearing = ttSHORT(info.data, info.hmtx + 4 * glyph_index + 2)
    else
        advanceWidth = ttSHORT(info.data, info.hmtx + 4 * (numOfLongHorMetrics - 1))
        leftSideBearing = ttSHORT(info.data, info.hmtx + 4 * numOfLongHorMetrics + 2 * (glyph_index - numOfLongHorMetrics))
    end

    return advanceWidth, leftSideBearing
end

--- @param info stbtt_fontinfo
function stbtt_GetFontVMetrics(info)
    local ascent = ttSHORT(info.data, info.hhea + 4)
    local descent = ttSHORT(info.data, info.hhea + 6)
    local lineGap = ttSHORT(info.data, info.hhea + 8)

    return ascent, descent, lineGap
end

--- @param info   stbtt_fontinfo
--- @param height float
function stbtt_ScaleForPixelHeight(info, height)
    local fheight = ttSHORT(info.data, info.hhea + 4) - ttSHORT(info.data, info.hhea + 6)
    return height / fheight
end

------------------------------------
------------------------------------
---
--- Antialiasing software rasterizer
---
---

--- @param font    stbtt_fontinfo
--- @param glyph   int
--- @param scale_x float
--- @param scale_y float
--- @param shift_x float
--- @param shift_y float
function stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y, shift_x, shift_y)
    local n, x0, y0, x1, y1 = stbtt_GetGlyphBox(font, glyph)

    local ix0, iy0, ix1, iy1
    if n == 0 then
        -- e.g. space character
        ix0 = 0
        iy0 = 0
        ix1 = 0
        iy1 = 0
    else
        -- move to integral bboxes (treating pixels as little squares, what pixels get touched)?
        ix0 = STBTT_ifloor( x0 * scale_x + shift_x)
        iy0 = STBTT_ifloor(-y1 * scale_y + shift_y)
        ix1 = STBTT_iceil( x1 * scale_x + shift_x)
        iy1 = STBTT_iceil(-y0 * scale_y + shift_y)
    end

    return ix0, iy0, ix1, iy1
end

--- @param font    stbtt_fontinfo
--- @param glyph   int
--- @param scale_x float
--- @param scale_y float
function stbtt_GetGlyphBitmapBox(font, glyph, scale_x, scale_y)
    return stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y, 0.0, 0.0)
end

--------------
--------------
---
--- Rasterizer
---
---

--- UNIMPLEMENTED / UNUSED:
---     stbtt_MakeCodepointBitmap
---     stbtt_MakeCodepointBitmapSubpixelPrefilter
---     stbtt_GetGlyphBitmap
---     stbtt_MakeGlyphBitmap
---     stbtt_GetGlyphBitmapSubpixel

--- @param scanline float[]
--- @param x        int
--- @param e        stbtt__active_edge
--- @param x0       float
--- @param y0       float
--- @param x1       float
--- @param y1       float
local function stbtt__handle_clipped_edge(scanline, x, e, x0, y0, x1, y1)
    if y0 == y1 then return end
    STBTT_assert(y0 < y1)
    STBTT_assert(e.sy <= e.ey)

    if y0 > e.ey then return end
    if y1 < e.sy then return end
    if y0 < e.sy then
        x0 = x0 + (x1 - x0) * (e.sy - y0) / (y1 - y0)
        y0 = e.sy
    end
    if y1 > e.ey then
        x1 = x1 + (x1 - x0) * (e.ey - y1) / (y1 - y0)
        y1 = e.ey
    end

    if x0 == x then
        STBTT_assert(x1 <= x + 1)
    elseif x0 == x + 1 then
        STBTT_assert(x1 >= x)
    elseif x0 <= x then
        STBTT_assert(x1 <= x)
    elseif x0 >= x + 1 then
        STBTT_assert(x1 >= x + 1)
    else
        STBTT_assert(x1 >= x and x1 <= x + 1)
    end

    if x0 <= x and x1 <= x then
        scanline[x] = scanline[x] + e.direction * (y1 - y0)
    elseif x0 >= x + 1 and x1 >= x + 1 then
        -- do nothing
    else
        STBTT_assert(x0 >= x and x0 <= x + 1 and x1 >= x and x1 <= x + 1)
        scanline[x] = scanline[x] + e.direction * (y1 - y0) * (1 - ((x0 - x) + (x1 - x)) / 2)
    end
end

--- @param height       float
--- @param top_width    float
--- @param bottom_width float
local function stbtt__sized_trapezoid_area(height, top_width, bottom_width)
    STBTT_assert(top_width >= 0)
    STBTT_assert(bottom_width >= 0)
    return (top_width + bottom_width) / 2.0 * height
end

--- @param height float
--- @param tx0    float
--- @param tx1    float
--- @param bx0    float
--- @param bx1    float
local function stbtt__position_trapezoid_area(height, tx0, tx1, bx0, bx1)
    return stbtt__sized_trapezoid_area(height, tx1 - tx0, bx1 - bx0)
end

--- @param height float
--- @param width  float
local function stbtt__sized_triangle_area(height, width)
    return height * width / 2
end

--- @param scanline      float[]
--- @param scanline_fill float[]
--- @param len           int
--- @param e             stbtt__active_edge
--- @param y_top         float
local function stbtt__fill_active_edges_new(scanline, scanline_fill, len, e, y_top)
    local y_bottom = y_top + 1

    while e do
        -- brute force every pixel
        -- compute intersection points with top & bottom
        STBTT_assert(e.ey >= y_top)

        if e.fdx == 0 then
            local x0 = e.fx
            if x0 < len then
                if x0 >= 0 then
                    stbtt__handle_clipped_edge(scanline, trunc(x0), e, x0, y_top, x0, y_bottom)
                    stbtt__handle_clipped_edge(scanline_fill, trunc(x0) + 1, e, x0, y_top, x0, y_bottom)
                else
                    stbtt__handle_clipped_edge(scanline_fill, 0, e, x0, y_top, x0, y_bottom)
                end
            end
        else
            local x0 = e.fx
            local dx = e.fdx
            local xb = x0 + dx
            local x_top, x_bottom
            local sy0, sy1
            local dy = e.fdy
            STBTT_assert(e.sy <= y_bottom and e.ey >= y_top)

            -- compute endpoints of line segment clipped to this scanline (if the
            -- line segment starts on this scanline. x0 is the intersection of the
            -- line with y_top, but that may be off the line segment.
            if e.sy > y_top then
                x_top = x0 + dx * (e.sy - y_top)
                sy0 = e.sy
            else
                x_top = x0
                sy0 = y_top
            end
            if e.ey < y_bottom then
                x_bottom = x0 + dx * (e.ey - y_top)
                sy1 = e.ey
            else
                x_bottom = xb
                sy1 = y_bottom
            end

            if x_top >= 0 and x_bottom >= 0 and x_top < len and x_bottom < len then
                -- from here on, we don't have to range check x values
                if trunc(x_top) == trunc(x_bottom) then
                    -- simple case, only spans one pixel
                    local height
                    local x = trunc(x_top)
                    height = (sy1 - sy0) * e.direction
                    STBTT_assert(x >= 0 and x < len)
                    scanline[x] = scanline[x] + stbtt__position_trapezoid_area(height, x_top, x + 1.0, x_bottom, x + 1.0)
                    scanline_fill[x + 1] = scanline_fill[x + 1] + height -- everything right of this pixel is filled
                else
                    local x1, x2
                    local y_crossing, y_final, step, sign, area
                    -- covers 2+ pixels
                    if x_top > x_bottom then
                        -- flip scanline vertically; signed area is the same
                        sy0 = y_bottom - (sy0 - y_top)
                        sy1 = y_bottom - (sy1 - y_top)
                        local t
                        t = sy0; sy0 = sy1; sy1 = t
                        t = x_bottom; x_bottom = x_top; x_top = t
                        dx = -dx
                        dy = -dy
                        t = x0; x0 = xb; xb = t
                    end
                    STBTT_assert(dy >= 0)
                    STBTT_assert(dx >= 0)

                    x1 = trunc(x_top)
                    x2 = trunc(x_bottom)
                    -- compute intersection with y axis at x1+1
                    y_crossing = y_top + dy * (x1 + 1 - x0)

                    -- compute intersection with y axis at x2
                    y_final = y_top + dy * (x2 - x0)

                    -- if x2 is right at the right edge of x1, y_crossing can blow up, github #1057
                    -- TODO: maybe test against sy1 rather than y_bottom?
                    if y_crossing > y_bottom then
                        y_crossing = y_bottom
                    end

                    sign = e.direction

                    -- area of the rectangle covered from sy0..y_crossing
                    area = sign * (y_crossing - sy0)

                    -- area of the triangle (x_top,sy0), (x1+1,sy0), (x1+1,y_crossing)
                    scanline[x1] = scanline[x1] + stbtt__sized_triangle_area(area, x1 + 1 - x_top)

                    -- check if final y_crossing is blown up; no test case for this
                    if y_final > y_bottom then
                        local denom = (x2 - (x1 + 1))
                        y_final = y_bottom
                        if denom ~= 0 then -- [DEAR IMGUI] Avoid div by zero (https://github.com/nothings/stb/issues/1316)
                            dy = (y_final - y_crossing) / denom -- if denom=0, y_final = y_crossing, so y_final <= y_bottom
                        end
                    end

                    step = sign * dy * 1 -- dy is dy/dx, change in y for every 1 change in x,
                    -- which multiplied by 1-pixel-width is how much pixel area changes for each step in x
                    -- so the area advances by 'step' every time

                    for x = x1 + 1, x2 - 1 do
                        scanline[x] = scanline[x] + area + step / 2 -- area of trapezoid is 1*step/2
                        area = area + step
                    end
                    STBTT_assert(STBTT_fabs(area) <= 1.01) -- accumulated error from area += step unless we round step down
                    STBTT_assert(sy1 > y_final - 0.01)

                    -- area covered in the last pixel is the rectangle from all the pixels to the left,
                    -- plus the trapezoid filled by the line segment in this pixel all the way to the right edge
                    scanline[x2] = scanline[x2] + area + sign * stbtt__position_trapezoid_area(sy1 - y_final, x2, x2 + 1.0, x_bottom, x2 + 1.0)

                    -- the rest of the line is filled based on the total height of the line segment in this pixel
                    scanline_fill[x2 + 1] = scanline_fill[x2 + 1] + sign * (sy1 - sy0)
                end
            else
                for x = 0, len - 1 do
                    -- rename variables to clearly-defined pairs
                    local y0 = y_top
                    local x1 = x
                    local x2 = x + 1
                    local x3 = xb
                    local y3 = y_bottom

                    -- x = e->x + e->dx * (y-y_top)
                    -- (y-y_top) = (x - e->x) / e->dx
                    -- y = (x - e->x) / e->dx + y_top
                    local y1 = (x - x0) / dx + y_top
                    local y2 = (x + 1 - x0) / dx + y_top

                    if x0 < x1 and x3 > x2 then -- three segments descending down-right
                        stbtt__handle_clipped_edge(scanline, x, e, x0, y0, x1, y1)
                        stbtt__handle_clipped_edge(scanline, x, e, x1, y1, x2, y2)
                        stbtt__handle_clipped_edge(scanline, x, e, x2, y2, x3, y3)
                    elseif x3 < x1 and x0 > x2 then -- three segments descending down-left
                        stbtt__handle_clipped_edge(scanline, x, e, x0, y0, x2, y2)
                        stbtt__handle_clipped_edge(scanline, x, e, x2, y2, x1, y1)
                        stbtt__handle_clipped_edge(scanline, x, e, x1, y1, x3, y3)
                    elseif x0 < x1 and x3 > x1 then -- two segments across x, down-right
                        stbtt__handle_clipped_edge(scanline, x, e, x0, y0, x1, y1)
                        stbtt__handle_clipped_edge(scanline, x, e, x1, y1, x3, y3)
                    elseif x3 < x1 and x0 > x1 then -- two segments across x, down-left
                        stbtt__handle_clipped_edge(scanline, x, e, x0, y0, x1, y1)
                        stbtt__handle_clipped_edge(scanline, x, e, x1, y1, x3, y3)
                    elseif x0 < x2 and x3 > x2 then -- two segments across x+1, down-right
                        stbtt__handle_clipped_edge(scanline, x, e, x0, y0, x2, y2)
                        stbtt__handle_clipped_edge(scanline, x, e, x2, y2, x3, y3)
                    elseif x3 < x2 and x0 > x2 then -- two segments across x+1, down-left
                        stbtt__handle_clipped_edge(scanline, x, e, x0, y0, x2, y2)
                        stbtt__handle_clipped_edge(scanline, x, e, x2, y2, x3, y3)
                    else -- one segment
                        stbtt__handle_clipped_edge(scanline, x, e, x0, y0, x3, y3)
                    end
                end
            end
        end
        e = e.next
    end
end

--- @param result     stbtt__bitmap
--- @param e          stbtt__edge
--- @param n          int
--- @param vsubsample int
--- @param off_x      int
--- @param off_y      int
local function stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y)
    local active = nil

    local scanline = {} -- size = result.w, 0-based
    local scanline2 = {} -- size = result.w + 1, 0-based

    STBTT__NOTUSED(vsubsample)

    local y = off_y
    e[n + 1].y0 = off_y + result.h + 1

    local j = 0
    local p = 1
    while j < result.h do
        -- find center of pixel for this scanline
        local scan_y_top = y + 0.0
        local scan_y_bottom = y + 1.0

        for i = 0, result.w - 1 do scanline[i] = 0 end
        for i = 0, result.w do scanline2[i] = 0 end

        local prev = nil
        local curr = active
        while curr do
            local next = curr.next
            if curr.ey <= scan_y_top then
                if prev then prev.next = next
                else          active   = next end
                curr.direction = 0
            else
                prev = curr
            end
            curr = next
        end

        local edge = e[p]
        while edge.y0 <= scan_y_bottom do
            if edge.y0 ~= edge.y1 then
                local z = stbtt__new_active(edge, off_x, scan_y_top)
                if j == 0 and off_y ~= 0 and z.ey < scan_y_top then
                    z.ey = scan_y_top
                end
                STBTT_assert(z.ey >= scan_y_top)
                z.next = active
                active = z
            end
            p = p + 1
            edge = e[p]
        end

        if active then
            stbtt__fill_active_edges_new(scanline, scanline2, result.w, active, scan_y_top)
        end

        do
            local sum = 0
            for i = 0, result.w - 1 do
                local k
                local m
                sum = sum + scanline2[i]
                k = scanline[i] + sum
                k = STBTT_fabs(k) * 255 + 0.5
                m = trunc(k)
                if m > 255 then m = 255 end
                result.pixels[j * result.stride + i + 1] = unsigned_char(m)
            end
        end

        step = active
        while step do
            step.fx = step.fx + step.fdx
            step = step.next
        end

        y = y + 1
        j = j + 1
    end
end

--- @param a stbtt__edge
--- @param b stbtt__edge
local STBTT__COMPARE = function(a, b)
    if a.y0 == nil then return false end -- sentinels on the back
    if b.y0 == nil then return true  end
    return a.y0 < b.y0
end

--- @param p stbtt__edge[]
local function stbtt__sort_edges(p)
    STBTT_sort(p, STBTT__COMPARE)
end

--- @param result   stbtt__bitmap
--- @param pts      stbtt__point[]
--- @param wcount   int[]
--- @param windings int
--- @param scale_x  float
--- @param scale_y  float
--- @param shift_x  float
--- @param shift_y  float
--- @param off_x    int
--- @param off_y    int
--- @param invert   bool
local function stbtt__rasterize(result, pts, wcount, windings, scale_x, scale_y, shift_x, shift_y, off_x, off_y, invert)
    local y_scale_inv = (invert) and -scale_y or scale_y
    local vsubsample = 1 -- STBTT_RASTERIZER_VERSION == 2

    -- now we have to blow out the windings into explicit edge lists
    local n = 0
    for i = 1, windings do
        n = n + wcount[i]
    end

    local e = {} for i = 1, n + 1 do e[i] = stbtt__edge() end -- add an extra one as a sentinel
    n = 0

    local m = 0
    local j
    for i = 1, windings do
        local p = m
        m = m + wcount[i]
        j = wcount[i]
        for k = 1, wcount[i] do
            repeat
            local a = k
            local b = j
            -- skip the edge if horizontal
            if pts[p + j].y == pts[p + k].y then
                break
            end
            -- add edge from j to k to the list
            n = n + 1
            e[n].invert = false
            if invert then
                if pts[p + j].y > pts[p + k].y then
                    e[n].invert = true
                    a = j
                    b = k
                end
            else
                if pts[p + j].y < pts[p + k].y then
                    e[n].invert = true
                    a = j
                    b = k
                end
            end
            e[n].x0 = pts[p + a].x * scale_x + shift_x
            e[n].y0 = (pts[p + a].y * y_scale_inv + shift_y) * vsubsample
            e[n].x1 = pts[p + b].x * scale_x + shift_x
            e[n].y1 = (pts[p + b].y * y_scale_inv + shift_y) * vsubsample

            until true
            j = k
        end
    end

    -- now sort the edges by their highest point (should snap to integer, and then by x)
    stbtt__sort_edges(e)

    -- now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
    stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y)
end

--- @param points? stbtt__point[]
--- @param n       int
--- @param x       float
--- @param y       float
local function stbtt__add_point(points, n, x, y)
    if points == nil then return end -- during first pass, it's unallocated
    points[n + 1].x = x
    points[n + 1].y = y
end

-- tessellate until threshold p is happy...
-- TODO: warped to compensate for non-linear stretching
--- @param points?                   stbtt__point[]
--- @param num_points                int
--- @param x0                        float
--- @param y0                        float
--- @param x1                        float
--- @param y1                        float
--- @param x2                        float
--- @param y2                        float
--- @param objspace_flatness_squared float
--- @param n                         int
--- @return int num_points # updated num_points passed in
local function stbtt__tesselate_curve(points, num_points, x0, y0, x1, y1, x2, y2, objspace_flatness_squared, n)
    -- midpoint
    local mx = (x0 + 2 * x1 + x2) / 4
    local my = (y0 + 2 * y1 + y2) / 4
    -- versus directly drawn line
    local dx = (x0 + x2) / 2 - mx
    local dy = (y0 + y2) / 2 - my

    if n > 16 then -- 65536 segments on one curve better be enough!
        return num_points
    end

    if dx * dx + dy * dy > objspace_flatness_squared then -- half-pixel error allowed... need to be smaller if AA
        num_points = stbtt__tesselate_curve(points, num_points, x0, y0, (x0 + x1) / 2.0, (y0 + y1) / 2.0, mx, my, objspace_flatness_squared, n + 1)
        num_points = stbtt__tesselate_curve(points, num_points, mx, my, (x1 + x2) / 2.0, (y1 + y2) / 2.0, x2, y2, objspace_flatness_squared, n + 1)
    else
        stbtt__add_point(points, num_points, x2, y2)
        num_points = num_points + 1
    end

    return num_points
end

--- @param points?                   stbtt__point[]
--- @param num_points                int
--- @param x0                        float
--- @param y0                        float
--- @param x1                        float
--- @param y1                        float
--- @param x2                        float
--- @param y2                        float
--- @param x3                        float
--- @param y3                        float
--- @param objspace_flatness_squared float
--- @param n                         int
--- @return int num_points # updated num_points passed in
local function stbtt__tesselate_cubic(points, num_points, x0, y0, x1, y1, x2, y2, x3, y3, objspace_flatness_squared, n)
    -- TODO: this "flatness" calculation is just made-up nonsense that seems to work well enough
    local dx0 = x1 - x0
    local dy0 = y1 - y0
    local dx1 = x2 - x1
    local dy1 = y2 - y1
    local dx2 = x3 - x2
    local dy2 = y3 - y2
    local dx = x3 - x0
    local dy = y3 - y0
    local longlen = STBTT_sqrt(dx0 * dx0 + dy0 * dy0) + STBTT_sqrt(dx1 * dx1 + dy1 * dy1) + STBTT_sqrt(dx2 * dx2 + dy2 * dy2)
    local shortlen = STBTT_sqrt(dx * dx + dy * dy)
    local flatness_squared = longlen * longlen - shortlen * shortlen

    if n > 16 then -- 65536 segments on one curve better be enough!
        return num_points
    end

    if flatness_squared > objspace_flatness_squared then
        local x01 = (x0 + x1) / 2
        local y01 = (y0 + y1) / 2
        local x12 = (x1 + x2) / 2
        local y12 = (y1 + y2) / 2
        local x23 = (x2 + x3) / 2
        local y23 = (y2 + y3) / 2

        local xa = (x01 + x12) / 2
        local ya = (y01 + y12) / 2
        local xb = (x12 + x23) / 2
        local yb = (y12 + y23) / 2

        local mx = (xa + xb) / 2
        local my = (ya + yb) / 2

        num_points = stbtt__tesselate_cubic(points, num_points, x0, y0, x01, y01, xa, ya, mx, my, objspace_flatness_squared, n + 1)
        num_points = stbtt__tesselate_cubic(points, num_points, mx, my, xb, yb, x23, y23, x3, y3, objspace_flatness_squared, n + 1)
    else
        stbtt__add_point(points, num_points, x3, y3)
        num_points = num_points + 1
    end

    return num_points
end

--- @param vertices          stbtt_vertex[]
--- @param num_verts         int
--- @param objspace_flatness float
--- @return stbtt__point[]? points
--- @return int?            num_contours
--- @return int[]?          contour_lengths
local function stbtt_FlattenCurves(vertices, num_verts, objspace_flatness)
    local points = nil
    local num_points = 0

    local objspace_flatness_squared = objspace_flatness * objspace_flatness
    local n = 0
    local start = 0

    -- count how many "moves" there are to get the contour count
    for i = 1, num_verts do
        if vertices[i].type == STBTT_VTX.MOVE then
            n = n + 1
        end
    end

    local num_contours = n
    if n == 0 then return nil end

    local contour_lengths = {} -- size = n

    -- make two passes through the points so we don't need to realloc
    for pass = 0, 1 do
        local x, y = 0, 0
        if pass == 1 then
            points = {}
            for i = 1, num_points do points[i] = stbtt__point() end
        end
        num_points = 0
        n = -1
        for i = 1, num_verts do
            if vertices[i].type == STBTT_VTX.MOVE then
                -- start the next contour
                if n >= 0 then
                    contour_lengths[n + 1] = num_points - start
                end
                n = n + 1
                start = num_points

                x = vertices[i].x
                y = vertices[i].y
                stbtt__add_point(points, num_points, x, y)
                num_points = num_points + 1
            elseif vertices[i].type == STBTT_VTX.LINE then
                x = vertices[i].x
                y = vertices[i].y
                stbtt__add_point(points, num_points, x, y)
                num_points = num_points + 1
            elseif vertices[i].type == STBTT_VTX.CURVE then
                num_points = stbtt__tesselate_curve(points, num_points, x, y,
                                    vertices[i].cx, vertices[i].cy,
                                    vertices[i].x, vertices[i].y,
                                    objspace_flatness_squared, 0)
                x = vertices[i].x
                y = vertices[i].y
            elseif vertices[i].type == STBTT_VTX.CUBIC then
                num_points = stbtt__tesselate_cubic(points, num_points, x, y,
                                    vertices[i].cx, vertices[i].cy,
                                    vertices[i].cx1, vertices[i].cy1,
                                    vertices[i].x, vertices[i].y,
                                    objspace_flatness_squared, 0)
                x = vertices[i].x
                y = vertices[i].y
            end
        end
        contour_lengths[n + 1] = num_points - start
    end

    return points, num_contours, contour_lengths
end

--- @param result             stbtt__bitmap
--- @param flatness_in_pixels float
--- @param vertices           stbtt_vertex[]
--- @param num_verts          int
--- @param scale_x            float
--- @param scale_y            float
--- @param shift_x            float
--- @param shift_y            float
--- @param x_off              int
--- @param y_off              int
--- @param invert             bool
local function stbtt_Rasterize(result, flatness_in_pixels, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert)
    local scale = (scale_x > scale_y) and scale_y or scale_x

    local windings, winding_count, winding_lengths = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale)

    if windings then
        --- @cast winding_lengths int[]
        --- @cast winding_count   int
        stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert)
    end
end

--- @param info       stbtt_fontinfo
--- @param output     unsigned_char[]
--- @param out_w      int
--- @param out_h      int
--- @param out_stride int
--- @param scale_x    float
--- @param scale_y    float
--- @param shift_x    float
--- @param shift_y    float
--- @param glyph      int
local function stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, glyph)
    local num_verts, vertices = stbtt_GetGlyphShape(info, glyph)
    local gbm = stbtt__bitmap()

    local ix0, iy0 = stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y)
    gbm.pixels = output
    gbm.w = out_w
    gbm.h = out_h
    gbm.stride = out_stride

    if gbm.w ~= 0 and gbm.h ~= 0 then
        stbtt_Rasterize(gbm, 0.35, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, true)
    end
end

-----------------
-----------------
---
--- Bitmap baking
---
---

--- UNIMPLEMENTED / UNUSED:
---     stbtt_BakeFontBitmap_internal
---     stbtt_BakeFontBitmap
---     stbtt_GetBakedQuad

---------------------------
---------------------------
---
--- Bitmap baking / packing
---
---

--- UNIMPLEMENTED / UNUSED:
---     stbtt_PackBegin
---     stbtt_PackSetOversampling
---     stbtt_PackSetSkipMissingCodepoints
---     stbtt_PackFontRangesGatherRects
---     stbtt_PackFontRangesRenderIntoRects
---     stbtt_PackFontRangesPackRects
---     stbtt_PackFontRanges
---     stbtt_PackFontRange
---     stbtt_GetPackedQuad
---     stbtt_GetScaledFontVMetrics

local STBTT__OVER_MASK = STBTT_MAX_OVERSAMPLE - 1

--- @param pixels          table
--- @param w               int
--- @param h               int
--- @param stride_in_bytes int
--- @param kernel_width    unsigned_int
local function stbtt__h_prefilter(pixels, w, h, stride_in_bytes, kernel_width)
    local buffer = {}
    local safe_w = w - kernel_width

    for j = 0, h - 1 do
        local total = 0
        local row_offset = j * stride_in_bytes

        for i = 1, kernel_width do buffer[i] = 0 end

        for i = 0, safe_w do
            total = total + pixels[row_offset + i + 1] - buffer[bit32.band(i, STBTT__OVER_MASK) + 1]
            buffer[bit32.band(i + kernel_width, STBTT__OVER_MASK) + 1] = pixels[row_offset + i + 1]
            pixels[row_offset + i + 1] = unsigned_char(total / kernel_width)
        end

        for i = safe_w + 1, w - 1 do
            STBTT_assert(pixels[row_offset + i + 1] == 0)
            total = total - buffer[bit32.band(i, STBTT__OVER_MASK) + 1]
            pixels[row_offset + i + 1] = unsigned_char(total / kernel_width)
        end
    end
end

--- @param pixels          table
--- @param w               int
--- @param h               int
--- @param stride_in_bytes int
--- @param kernel_width    unsigned_int
local function stbtt__v_prefilter(pixels, w, h, stride_in_bytes, kernel_width)
    local buffer = {}
    local safe_h = h - kernel_width

    for j = 0, w - 1 do
        local total = 0
        local col_offset = j

        for i = 1, kernel_width do buffer[i] = 0 end

        for i = 0, safe_h do
            total = total + pixels[col_offset + i * stride_in_bytes + 1] - buffer[bit32.band(i, STBTT__OVER_MASK) + 1]
            buffer[bit32.band(i + kernel_width, STBTT__OVER_MASK) + 1] = pixels[col_offset + i * stride_in_bytes + 1]
            pixels[col_offset + i * stride_in_bytes + 1] = unsigned_char(total / kernel_width)
        end

        for i = safe_h + 1, h - 1 do
            STBTT_assert(pixels[col_offset + i * stride_in_bytes + 1] == 0)
            total = total - buffer[bit32.band(i, STBTT__OVER_MASK) + 1]
            pixels[col_offset + i * stride_in_bytes + 1] = unsigned_char(total / kernel_width)
        end
    end
end

--- @param oversample int
--- @return float
local function stbtt__oversample_shift(oversample)
    if oversample == 0 then
        return 0.0
    end
    return -(oversample - 1) / (2.0 * oversample)
end

--- @param info        stbtt_fontinfo
--- @param output      unsigned_char[]
--- @param out_w       int
--- @param out_h       int
--- @param out_stride  int
--- @param scale_x     float
--- @param scale_y     float
--- @param shift_x     float
--- @param shift_y     float
--- @param prefilter_x int
--- @param prefilter_y int
--- @param glyph       int
function stbtt_MakeGlyphBitmapSubpixelPrefilter(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, prefilter_x, prefilter_y, glyph)
    stbtt_MakeGlyphBitmapSubpixel(info, output, out_w - (prefilter_x - 1), out_h - (prefilter_y - 1), out_stride, scale_x, scale_y, shift_x, shift_y, glyph)

    if prefilter_x > 1 then
        stbtt__h_prefilter(output, out_w, out_h, out_stride, prefilter_x)
    end

    if prefilter_y > 1 then
        stbtt__v_prefilter(output, out_w, out_h, out_stride, prefilter_y)
    end

    local sub_x, sub_y
    sub_x = stbtt__oversample_shift(prefilter_x)
    sub_y = stbtt__oversample_shift(prefilter_y)
    return sub_x, sub_y
end

-------------------
-------------------
---
--- SDF computation
---
---

--- UNIMPLEMENTED / UNUSED:
---     stbtt__ray_intersect_bezier
---     stbtt__compute_crossings_x
---     stbtt__cuberoot
---     stbtt__solve_cubic
---     stbtt_GetGlyphSDF
---     stbtt_GetCodepointSDF

-----------------------------------------------------
-----------------------------------------------------
---
--- Font name matching -- recommended not to use this
---
---

--- UNIMPLEMENTED / UNUSED:
---     stbtt__CompareUTF8toUTF16_bigendian_prefix
---     stbtt_CompareUTF8toUTF16_bigendian_internal
---     stbtt_GetFontNameString
---     stbtt__matchpair
---     stbtt__matches

--- @param data  table
--- @param index int
function stbtt_GetFontOffsetForIndex(data, index) return stbtt_GetFontOffsetForIndex_internal(data, index) end

--- @param info   stbtt_fontinfo
--- @param data   table
--- @param offset int
function stbtt_InitFont(info, data, offset) return stbtt_InitFont_internal(info, data, offset) end

return {
    fontinfo = stbtt_fontinfo,

    InitFont                         = stbtt_InitFont,
    FindGlyphIndex                   = stbtt_FindGlyphIndex,
    MakeGlyphBitmapSubpixelPrefilter = stbtt_MakeGlyphBitmapSubpixelPrefilter,
    GetFontVMetrics                  = stbtt_GetFontVMetrics,
    GetGlyphBitmapBox                = stbtt_GetGlyphBitmapBox,
    GetGlyphBitmapBoxSubpixel        = stbtt_GetGlyphBitmapBoxSubpixel,
    GetGlyphHMetrics                 = stbtt_GetGlyphHMetrics,
    GetFontOffsetForIndex            = stbtt_GetFontOffsetForIndex,
    ScaleForPixelHeight              = stbtt_ScaleForPixelHeight
}
end

__FILES['imstd_minstdio.lua'] = function()
--- ImGui Sincerely
-- This is a minimal Lua impl of C-like sscanf, sprintf sub-set

-- Supports:
-- - %x, %X, %nx, %nX (where n is a number)
-- - %d, %nd (where n is a number)
-- - %f, %lf (very limited)
--
-- Returns items_matched instead of EOF on error

local _byte = string.byte

local CHAR_PERCENT = _byte'%'
local CHAR_DOT = _byte'.'
local CHAR_PLUS, CHAR_MINUS = _byte'+', _byte'-'
local CHAR_0, CHAR_9 = _byte'0', _byte'9'
local CHAR_a, CHAR_A = _byte'a', _byte'A'
local CHAR_d = _byte'd'
local CHAR_l = _byte'l'
local CHAR_f, CHAR_F = _byte'f', _byte'F'
local CHAR_x, CHAR_X = _byte'x', _byte'X'

local function isspace(c) return c == 32 or c == 9 end
local function isdigit(c) return c >= CHAR_0 and c <= CHAR_9 end
local function isxdigit(c) return isdigit(c) or (c >= CHAR_a and c <= CHAR_f) or (c >= CHAR_A and c <= CHAR_F) end

local function isdigit_under_base(c, base)
    if     base == 10 then return isdigit(c)
    elseif base == 16 then return isxdigit(c)
    end
end

local function hex_digit_to_int(c)
    if c >= CHAR_0 and c <= CHAR_9 then return c - CHAR_0 end
    if c >= CHAR_a and c <= CHAR_f then return c - CHAR_a + 10 end
    if c >= CHAR_A and c <= CHAR_F then return c - CHAR_A + 10 end
end

-- we force this behavior by default
local function clamp_if_overflow(spec, val)
    if spec == CHAR_d or spec == CHAR_x or spec == CHAR_X then
        if val > INT_MAX then return INT_MAX end
        if val < INT_MIN then return INT_MIN end
    end

    return val
end

--- @param buffer       char[]
--- @param buffer_begin int
--- @param format       string
--- @param result       table  # table to store parsed values
local function sscanf(buffer, buffer_begin, format, result)
    local p = buffer_begin
    local f = 1 -- format_begin
    local format_len = #format
    local assigned = 0
    local items_matched = 0

    while f <= format_len do
        repeat
        if isspace(_byte(format, f, f)) then
            while isspace(buffer[p]) do
                p = p + 1
            end
            f = f + 1

            break
        end

        if _byte(format, f, f) ~= CHAR_PERCENT then
            if buffer[p] == _byte(format, f, f) then
                p = p + 1
                f = f + 1
            else
                return items_matched
            end

            break
        end

        -- encountered % in fmt
        f = f + 1

        -- %%
        if _byte(format, f, f) == CHAR_PERCENT then
            if buffer[p] == CHAR_PERCENT then
                p = p + 1
                f = f + 1
            else
                return items_matched
            end

            break
        end

        -- handle optional width
        local width = 0
        while isdigit(_byte(format, f, f)) do
            width = width * 10 + _byte(format, f, f) - CHAR_0
            f = f + 1
        end
        if width == 0 then
            width = math.huge
        end

        local spec = _byte(format, f, f)
        local base
        local is_float = false
        if     spec == CHAR_x or spec == CHAR_X then
            base = 16
        elseif spec == CHAR_d then
            base = 10
        elseif spec == CHAR_f or spec == CHAR_F then
            is_float = true
        elseif spec == CHAR_l then
            f = f + 1
            if _byte(format, f, f) == CHAR_f then
                is_float = true -- TODO: distinguish from float?
            else
                return items_matched
            end
        else
            return items_matched
        end
        f = f + 1

        while isspace(buffer[p]) do
            p = p + 1
        end

        local val
        if is_float then
            local sign = 1
            if     buffer[p] == CHAR_PLUS then
                p = p + 1
            elseif buffer[p] == CHAR_MINUS then
                sign = -1
                p = p + 1
            end

            -- inf, nan are not handled

            local p_start = p
            local int_part = 0

            while isdigit(buffer[p]) do
                int_part = int_part * 10 + (buffer[p] - CHAR_0)
                p = p + 1
            end

            local frac_part = 0
            local frac_div = 1
            if buffer[p] == CHAR_DOT then
                p = p + 1
                while isdigit(buffer[p]) do
                    frac_part = frac_part * 10 + (buffer[p] - CHAR_0)
                    frac_div = frac_div * 10
                    p = p + 1
                end
            end

            if p == p_start then
                return items_matched
            end

            val = sign * (int_part + frac_part / frac_div)
        else
            local sign = 1
            -- optional sign
            if base == 10 then
                if     buffer[p] == CHAR_PLUS then
                    p = p + 1
                    width = width - 1
                elseif buffer[p] == CHAR_MINUS then
                    sign = -1
                    p = p + 1
                    width = width - 1
                end
            end

            local p_start = p
            while width > 0 and buffer[p] and isdigit_under_base(buffer[p], base) do
                p = p + 1
                width = width - 1
            end

            if p == p_start then
                -- failed to match
                return items_matched
            end

            val = 0
            while p_start < p do
                local c = buffer[p_start]
                p_start = p_start + 1
                val = val * base + sign * hex_digit_to_int(c)

                local old_val = val
                val = clamp_if_overflow(spec, val)
                if old_val ~= val then
                    break
                end
            end
        end

        result[assigned + 1] = val
        assigned = assigned + 1
        items_matched = items_matched + 1

        until true
    end

    return items_matched
end

local function sprintf()

end

return sscanf
end

IM_INCLUDE('imgui.lua')
IM_INCLUDE('imgui_impl_roblox.lua')
IM_INCLUDE('imgui_demo.lua')
IM_INCLUDE('imgui_demo_2.lua')
IM_INCLUDE('imgui_demo_apps.lua')
IM_INCLUDE('imgui_demo_widgets.lua')

return {
    BuildLoadGlyphGetAdvanceOrFallback = BuildLoadGlyphGetAdvanceOrFallback,
    CalcNextScrollFromScrollTargetAndClamp = CalcNextScrollFromScrollTargetAndClamp,
    DBL_MAX = DBL_MAX,
    DemoB2I = DemoB2I,
    DemoBuf = DemoBuf,
    DemoBufStr = DemoBufStr,
    DemoClamp = DemoClamp,
    DemoCollapsingHeaderClosable = DemoCollapsingHeaderClosable,
    DemoCombo = DemoCombo,
    DemoHSV = DemoHSV,
    DemoHas = DemoHas,
    DemoItems = DemoItems,
    DemoListBox = DemoListBox,
    DemoNotPorted = DemoNotPorted,
    DemoNotSupported = DemoNotSupported,
    DemoTextFilter = DemoTextFilter,
    DemoWindowLayout = DemoWindowLayout,
    DemoWindowPopups = DemoWindowPopups,
    DemoWindowTables = DemoWindowTables,
    DemoWindowWidgets = DemoWindowWidgets,
    DemoWindowWidgetsBasic = DemoWindowWidgetsBasic,
    DemoWindowWidgetsBullets = DemoWindowWidgetsBullets,
    DemoWindowWidgetsCollapsingHeaders = DemoWindowWidgetsCollapsingHeaders,
    DemoWindowWidgetsColorAndPickers = DemoWindowWidgetsColorAndPickers,
    DemoWindowWidgetsComboBoxes = DemoWindowWidgetsComboBoxes,
    DemoWindowWidgetsDataTypes = DemoWindowWidgetsDataTypes,
    DemoWindowWidgetsDisableBlocks = DemoWindowWidgetsDisableBlocks,
    DemoWindowWidgetsDragAndDrop = DemoWindowWidgetsDragAndDrop,
    DemoWindowWidgetsDragsAndSliders = DemoWindowWidgetsDragsAndSliders,
    DemoWindowWidgetsFonts = DemoWindowWidgetsFonts,
    DemoWindowWidgetsImages = DemoWindowWidgetsImages,
    DemoWindowWidgetsListBoxes = DemoWindowWidgetsListBoxes,
    DemoWindowWidgetsLiveEdit = DemoWindowWidgetsLiveEdit,
    DemoWindowWidgetsMixedValues = DemoWindowWidgetsMixedValues,
    DemoWindowWidgetsMultiComponents = DemoWindowWidgetsMultiComponents,
    DemoWindowWidgetsPlotting = DemoWindowWidgetsPlotting,
    DemoWindowWidgetsProgressBars = DemoWindowWidgetsProgressBars,
    DemoWindowWidgetsQueryingStatuses = DemoWindowWidgetsQueryingStatuses,
    DemoWindowWidgetsSelectables = DemoWindowWidgetsSelectables,
    DemoWindowWidgetsTabs = DemoWindowWidgetsTabs,
    DemoWindowWidgetsText = DemoWindowWidgetsText,
    DemoWindowWidgetsTextFilter = DemoWindowWidgetsTextFilter,
    DemoWindowWidgetsTextInput = DemoWindowWidgetsTextInput,
    DemoWindowWidgetsTooltips = DemoWindowWidgetsTooltips,
    DemoWindowWidgetsTreeNodes = DemoWindowWidgetsTreeNodes,
    DemoWindowWidgetsVerticalSliders = DemoWindowWidgetsVerticalSliders,
    DockSettingsFindNodeSettings = DockSettingsFindNodeSettings,
    DockSettingsHandler_ApplyAll = DockSettingsHandler_ApplyAll,
    DockSettingsHandler_ClearAll = DockSettingsHandler_ClearAll,
    DockSettingsHandler_ReadLine = DockSettingsHandler_ReadLine,
    DockSettingsHandler_ReadOpen = DockSettingsHandler_ReadOpen,
    DockSettingsHandler_WriteAll = DockSettingsHandler_WriteAll,
    DockSettingsRemoveNodeReferences = DockSettingsRemoveNodeReferences,
    DockSettingsRenameNodeReferences = DockSettingsRenameNodeReferences,
    ExampleImageViewerData = ExampleImageViewerData,
    ExampleImageViewer_DrawCanvas = ExampleImageViewer_DrawCanvas,
    ExampleImageViewer_DrawOptions = ExampleImageViewer_DrawOptions,
    ExampleTreeNode = ExampleTreeNode,
    ExampleTree_CreateDemoTree = ExampleTree_CreateDemoTree,
    ExampleTree_CreateNode = ExampleTree_CreateNode,
    ExampleTree_DestroyNode = ExampleTree_DestroyNode,
    FLT_MAX = FLT_MAX,
    FLT_MIN = FLT_MIN,
    FONT_ATLAS_DEFAULT_TEX_DATA_H = FONT_ATLAS_DEFAULT_TEX_DATA_H,
    FONT_ATLAS_DEFAULT_TEX_DATA_W = FONT_ATLAS_DEFAULT_TEX_DATA_W,
    GetDefaultFontDataProggyClean = GetDefaultFontDataProggyClean,
    GetDefaultFontDataProggyForever = GetDefaultFontDataProggyForever,
    GetMinimumStepAtDecimalPrecision = GetMinimumStepAtDecimalPrecision,
    HelpMarker = HelpMarker,
    IMGUI_DEBUG_LOG_ACTIVEID = IMGUI_DEBUG_LOG_ACTIVEID,
    IMGUI_DEBUG_LOG_FONT = IMGUI_DEBUG_LOG_FONT,
    IMGUI_DEBUG_LOG_POPUP = IMGUI_DEBUG_LOG_POPUP,
    IMGUI_DEBUG_LOG_VIEWPORT = IMGUI_DEBUG_LOG_VIEWPORT,
    IMGUI_DEMO_MARKER = IMGUI_DEMO_MARKER,
    IMGUI_DISABLE_DEBUG_TOOLS = IMGUI_DISABLE_DEBUG_TOOLS,
    IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS = IMGUI_DISABLE_DEFAULT_FILE_FUNCTIONS,
    IMGUI_FONT_SIZE_MAX = IMGUI_FONT_SIZE_MAX,
    IMGUI_FONT_SIZE_THRESHOLD_FOR_LOADADVANCEXONLYMODE = IMGUI_FONT_SIZE_THRESHOLD_FOR_LOADADVANCEXONLYMODE,
    IMGUI_PAYLOAD_TYPE_COLOR_3F = IMGUI_PAYLOAD_TYPE_COLOR_3F,
    IMGUI_PAYLOAD_TYPE_COLOR_4F = IMGUI_PAYLOAD_TYPE_COLOR_4F,
    IMGUI_PAYLOAD_TYPE_WINDOW = IMGUI_PAYLOAD_TYPE_WINDOW,
    IMGUI_TABLE_MAX_COLUMNS = IMGUI_TABLE_MAX_COLUMNS,
    IMGUI_VERSION = IMGUI_VERSION,
    IMGUI_VERSION_NUM = IMGUI_VERSION_NUM,
    IMGUI_WINDOW_HARD_MIN_SIZE = IMGUI_WINDOW_HARD_MIN_SIZE,
    IMSTB_TEXTEDIT_UNDOSTATECOUNT = IMSTB_TEXTEDIT_UNDOSTATECOUNT,
    IM_ALLOC = IM_ALLOC,
    IM_ASSERT = IM_ASSERT,
    IM_ASSERT_PARANOID = IM_ASSERT_PARANOID,
    IM_ASSERT_USER_ERROR = IM_ASSERT_USER_ERROR,
    IM_ASSERT_USER_ERROR_RET = IM_ASSERT_USER_ERROR_RET,
    IM_BITARRAY_CLEARBIT = IM_BITARRAY_CLEARBIT,
    IM_BITARRAY_TESTBIT = IM_BITARRAY_TESTBIT,
    IM_COL32 = IM_COL32,
    IM_COL32_A_MASK = IM_COL32_A_MASK,
    IM_COL32_A_SHIFT = IM_COL32_A_SHIFT,
    IM_COL32_BLACK = IM_COL32_BLACK,
    IM_COL32_BLACK_TRANS = IM_COL32_BLACK_TRANS,
    IM_COL32_B_SHIFT = IM_COL32_B_SHIFT,
    IM_COL32_DISABLE = IM_COL32_DISABLE,
    IM_COL32_G_SHIFT = IM_COL32_G_SHIFT,
    IM_COL32_R_SHIFT = IM_COL32_R_SHIFT,
    IM_COL32_WHITE = IM_COL32_WHITE,
    IM_DELETE = IM_DELETE,
    IM_DRAWLIST_ARCFAST_SAMPLE_MAX = IM_DRAWLIST_ARCFAST_SAMPLE_MAX,
    IM_DRAWLIST_ARCFAST_TABLE_SIZE = IM_DRAWLIST_ARCFAST_TABLE_SIZE,
    IM_F32_TO_INT8_SAT = IM_F32_TO_INT8_SAT,
    IM_F32_TO_INT8_UNBOUND = IM_F32_TO_INT8_UNBOUND,
    IM_FILE_CLOSE = IM_FILE_CLOSE,
    IM_FILE_READ = IM_FILE_READ,
    IM_FILE_SIZE = IM_FILE_SIZE,
    IM_FILE_WRITE = IM_FILE_WRITE,
    IM_FREE = IM_FREE,
    IM_PI = IM_PI,
    IM_ROUND = IM_ROUND,
    IM_ROUNDUP_TO_EVEN = IM_ROUNDUP_TO_EVEN,
    IM_TABSIZE = IM_TABSIZE,
    IM_TRUNC = IM_TRUNC,
    IM_UNICODE_CODEPOINT_INVALID = IM_UNICODE_CODEPOINT_INVALID,
    IM_UNICODE_CODEPOINT_MAX = IM_UNICODE_CODEPOINT_MAX,
    INT_MAX = INT_MAX,
    INT_MIN = INT_MIN,
    ImAbs = ImAbs,
    ImAcos = ImAcos,
    ImAddClampOverflow = ImAddClampOverflow,
    ImAtan2 = ImAtan2,
    ImAtof = ImAtof,
    ImBezierCubicCalc = ImBezierCubicCalc,
    ImBezierQuadraticCalc = ImBezierQuadraticCalc,
    ImBitArray = ImBitArray,
    ImBitArraySetBit = ImBitArraySetBit,
    ImCeil = ImCeil,
    ImCeilFast = ImCeilFast,
    ImCharIsBlankA = ImCharIsBlankA,
    ImCharIsBlankW = ImCharIsBlankW,
    ImCharIsSeparatorW = ImCharIsSeparatorW,
    ImClamp = ImClamp,
    ImCos = ImCos,
    ImCountSetBits = ImCountSetBits,
    ImDot = ImDot,
    ImDrawChannel = ImDrawChannel,
    ImDrawCmd = ImDrawCmd,
    ImDrawCmdHeader = ImDrawCmdHeader,
    ImDrawData = ImDrawData,
    ImDrawFlags = ImDrawFlags,
    ImDrawList = ImDrawList,
    ImDrawListFlags = ImDrawListFlags,
    ImDrawListSharedData = ImDrawListSharedData,
    ImDrawListSplitter = ImDrawListSplitter,
    ImDrawTextFlags = ImDrawTextFlags,
    ImDrawVert = ImDrawVert,
    ImFabs = ImFabs,
    ImFloor = ImFloor,
    ImFmod = ImFmod,
    ImFont = ImFont,
    ImFontAtlas = ImFontAtlas,
    ImFontAtlasAddDrawListSharedData = ImFontAtlasAddDrawListSharedData,
    ImFontAtlasBakedAdd = ImFontAtlasBakedAdd,
    ImFontAtlasBakedAddFontGlyph = ImFontAtlasBakedAddFontGlyph,
    ImFontAtlasBakedAddFontGlyphAdvancedX = ImFontAtlasBakedAddFontGlyphAdvancedX,
    ImFontAtlasBakedDiscard = ImFontAtlasBakedDiscard,
    ImFontAtlasBakedGetClosestMatch = ImFontAtlasBakedGetClosestMatch,
    ImFontAtlasBakedGetId = ImFontAtlasBakedGetId,
    ImFontAtlasBakedGetOrAdd = ImFontAtlasBakedGetOrAdd,
    ImFontAtlasBuildAcceptCodepointForSource = ImFontAtlasBuildAcceptCodepointForSource,
    ImFontAtlasBuildDestroy = ImFontAtlasBuildDestroy,
    ImFontAtlasBuildInit = ImFontAtlasBuildInit,
    ImFontAtlasBuildMain = ImFontAtlasBuildMain,
    ImFontAtlasBuildNotifySetFont = ImFontAtlasBuildNotifySetFont,
    ImFontAtlasBuildRenderBitmapFromString = ImFontAtlasBuildRenderBitmapFromString,
    ImFontAtlasBuildSetTexture = ImFontAtlasBuildSetTexture,
    ImFontAtlasBuildSetupFontBakedBlanks = ImFontAtlasBuildSetupFontBakedBlanks,
    ImFontAtlasBuildSetupFontBakedEllipsis = ImFontAtlasBuildSetupFontBakedEllipsis,
    ImFontAtlasBuildSetupFontBakedFallback = ImFontAtlasBuildSetupFontBakedFallback,
    ImFontAtlasBuildSetupFontLoader = ImFontAtlasBuildSetupFontLoader,
    ImFontAtlasBuildSetupFontSpecialGlyphs = ImFontAtlasBuildSetupFontSpecialGlyphs,
    ImFontAtlasBuildUpdateTexData = ImFontAtlasBuildUpdateTexData,
    ImFontAtlasBuildUpdateTexDataBasic = ImFontAtlasBuildUpdateTexDataBasic,
    ImFontAtlasBuildUpdateTexDataLines = ImFontAtlasBuildUpdateTexDataLines,
    ImFontAtlasBuilder = ImFontAtlasBuilder,
    ImFontAtlasFlags = ImFontAtlasFlags,
    ImFontAtlasFontDestroyOutput = ImFontAtlasFontDestroyOutput,
    ImFontAtlasFontDestroySourceData = ImFontAtlasFontDestroySourceData,
    ImFontAtlasFontInitOutput = ImFontAtlasFontInitOutput,
    ImFontAtlasFontSourceAddToFont = ImFontAtlasFontSourceAddToFont,
    ImFontAtlasFontSourceInit = ImFontAtlasFontSourceInit,
    ImFontAtlasGetMouseCursorTexData = ImFontAtlasGetMouseCursorTexData,
    ImFontAtlasPackAddRect = ImFontAtlasPackAddRect,
    ImFontAtlasPackDiscardRect = ImFontAtlasPackDiscardRect,
    ImFontAtlasPackGetRect = ImFontAtlasPackGetRect,
    ImFontAtlasPackGetRectSafe = ImFontAtlasPackGetRectSafe,
    ImFontAtlasPackInit = ImFontAtlasPackInit,
    ImFontAtlasPostProcessData = ImFontAtlasPostProcessData,
    ImFontAtlasRect = ImFontAtlasRect,
    ImFontAtlasRectEntry = ImFontAtlasRectEntry,
    ImFontAtlasRectId_GetGeneration = ImFontAtlasRectId_GetGeneration,
    ImFontAtlasRectId_GetIndex = ImFontAtlasRectId_GetIndex,
    ImFontAtlasRectId_Invalid = ImFontAtlasRectId_Invalid,
    ImFontAtlasRectId_Make = ImFontAtlasRectId_Make,
    ImFontAtlasRemoveDrawListSharedData = ImFontAtlasRemoveDrawListSharedData,
    ImFontAtlasTextureAdd = ImFontAtlasTextureAdd,
    ImFontAtlasTextureBlockConvert = ImFontAtlasTextureBlockConvert,
    ImFontAtlasTextureBlockCopy = ImFontAtlasTextureBlockCopy,
    ImFontAtlasTextureBlockPostProcess = ImFontAtlasTextureBlockPostProcess,
    ImFontAtlasTextureBlockPostProcessMultiply = ImFontAtlasTextureBlockPostProcessMultiply,
    ImFontAtlasTextureBlockQueueUpload = ImFontAtlasTextureBlockQueueUpload,
    ImFontAtlasTextureCompact = ImFontAtlasTextureCompact,
    ImFontAtlasTextureGetSizeEstimate = ImFontAtlasTextureGetSizeEstimate,
    ImFontAtlasTextureGrow = ImFontAtlasTextureGrow,
    ImFontAtlasUpdateDrawListsSharedData = ImFontAtlasUpdateDrawListsSharedData,
    ImFontAtlasUpdateNewFrame = ImFontAtlasUpdateNewFrame,
    ImFontBaked = ImFontBaked,
    ImFontBaked_BuildGrowIndex = ImFontBaked_BuildGrowIndex,
    ImFontBaked_BuildLoadGlyph = ImFontBaked_BuildLoadGlyph,
    ImFontBaked_BuildLoadGlyphAdvanceX = ImFontBaked_BuildLoadGlyphAdvanceX,
    ImFontCalcTextSizeEx = ImFontCalcTextSizeEx,
    ImFontCalcWordWrapPositionEx = ImFontCalcWordWrapPositionEx,
    ImFontConfig = ImFontConfig,
    ImFontFlags = ImFontFlags,
    ImFontGlyph = ImFontGlyph,
    ImFontLoader = ImFontLoader,
    ImFontStackData = ImFontStackData,
    ImFormatString = ImFormatString,
    ImGui = ImGui,
    ImGuiActivateFlags = ImGuiActivateFlags,
    ImGuiAxis = ImGuiAxis,
    ImGuiBackendFlags = ImGuiBackendFlags,
    ImGuiButtonFlags = ImGuiButtonFlags,
    ImGuiChildFlags = ImGuiChildFlags,
    ImGuiCol = ImGuiCol,
    ImGuiColorEditFlags = ImGuiColorEditFlags,
    ImGuiColorMod = ImGuiColorMod,
    ImGuiComboFlags = ImGuiComboFlags,
    ImGuiCond = ImGuiCond,
    ImGuiConfigFlags = ImGuiConfigFlags,
    ImGuiContext = ImGuiContext,
    ImGuiDataAuthority = ImGuiDataAuthority,
    ImGuiDataType = ImGuiDataType,
    ImGuiDebugLogFlags = ImGuiDebugLogFlags,
    ImGuiDemoWindowData = ImGuiDemoWindowData,
    ImGuiDir = ImGuiDir,
    ImGuiDockContext = ImGuiDockContext,
    ImGuiDockNode = ImGuiDockNode,
    ImGuiDockNodeFlags = ImGuiDockNodeFlags,
    ImGuiDockNodeState = ImGuiDockNodeState,
    ImGuiDragDropFlags = ImGuiDragDropFlags,
    ImGuiErrorRecoveryState = ImGuiErrorRecoveryState,
    ImGuiFocusRequestFlags = ImGuiFocusRequestFlags,
    ImGuiFocusScopeData = ImGuiFocusScopeData,
    ImGuiFocusedFlags = ImGuiFocusedFlags,
    ImGuiGroupData = ImGuiGroupData,
    ImGuiHoveredFlags = ImGuiHoveredFlags,
    ImGuiIO = ImGuiIO,
    ImGuiInputEvent = ImGuiInputEvent,
    ImGuiInputEventAppFocused = ImGuiInputEventAppFocused,
    ImGuiInputEventKey = ImGuiInputEventKey,
    ImGuiInputEventMouseButton = ImGuiInputEventMouseButton,
    ImGuiInputEventMousePos = ImGuiInputEventMousePos,
    ImGuiInputEventMouseViewport = ImGuiInputEventMouseViewport,
    ImGuiInputEventMouseWheel = ImGuiInputEventMouseWheel,
    ImGuiInputEventText = ImGuiInputEventText,
    ImGuiInputEventType = ImGuiInputEventType,
    ImGuiInputFlags = ImGuiInputFlags,
    ImGuiInputSource = ImGuiInputSource,
    ImGuiInputTextCallbackData = ImGuiInputTextCallbackData,
    ImGuiInputTextFlags = ImGuiInputTextFlags,
    ImGuiItemFlags = ImGuiItemFlags,
    ImGuiItemStatusFlags = ImGuiItemStatusFlags,
    ImGuiKey = ImGuiKey,
    ImGuiKeyData = ImGuiKeyData,
    ImGuiKeyOwnerData = ImGuiKeyOwnerData,
    ImGuiKeyOwner_Any = ImGuiKeyOwner_Any,
    ImGuiKeyOwner_NoOwner = ImGuiKeyOwner_NoOwner,
    ImGuiKeyRoutingData = ImGuiKeyRoutingData,
    ImGuiKey_Aliases_BEGIN = ImGuiKey_Aliases_BEGIN,
    ImGuiKey_Aliases_END = ImGuiKey_Aliases_END,
    ImGuiKey_Gamepad_BEGIN = ImGuiKey_Gamepad_BEGIN,
    ImGuiKey_Gamepad_END = ImGuiKey_Gamepad_END,
    ImGuiKey_Keyboard_BEGIN = ImGuiKey_Keyboard_BEGIN,
    ImGuiKey_Keyboard_END = ImGuiKey_Keyboard_END,
    ImGuiKey_Mouse_BEGIN = ImGuiKey_Mouse_BEGIN,
    ImGuiKey_Mouse_END = ImGuiKey_Mouse_END,
    ImGuiLastItemData = ImGuiLastItemData,
    ImGuiLastItemData_Copy = ImGuiLastItemData_Copy,
    ImGuiLayoutType = ImGuiLayoutType,
    ImGuiListClipper = ImGuiListClipper,
    ImGuiListClipperFlags = ImGuiListClipperFlags,
    ImGuiLocKey = ImGuiLocKey,
    ImGuiLogFlags = ImGuiLogFlags,
    ImGuiMod_Alt = ImGuiMod_Alt,
    ImGuiMod_Ctrl = ImGuiMod_Ctrl,
    ImGuiMod_Mask_ = ImGuiMod_Mask_,
    ImGuiMod_None = ImGuiMod_None,
    ImGuiMod_Shift = ImGuiMod_Shift,
    ImGuiMod_Super = ImGuiMod_Super,
    ImGuiMouseButton = ImGuiMouseButton,
    ImGuiMouseCursor = ImGuiMouseCursor,
    ImGuiMouseSource = ImGuiMouseSource,
    ImGuiNavLayer = ImGuiNavLayer,
    ImGuiNavMoveFlags = ImGuiNavMoveFlags,
    ImGuiNavRenderCursorFlags = ImGuiNavRenderCursorFlags,
    ImGuiNextItemData = ImGuiNextItemData,
    ImGuiNextItemDataFlags = ImGuiNextItemDataFlags,
    ImGuiNextWindowData = ImGuiNextWindowData,
    ImGuiNextWindowDataFlags = ImGuiNextWindowDataFlags,
    ImGuiOldColumnData = ImGuiOldColumnData,
    ImGuiOldColumnFlags = ImGuiOldColumnFlags,
    ImGuiOldColumns = ImGuiOldColumns,
    ImGuiPayload = ImGuiPayload,
    ImGuiPayload_Clear = ImGuiPayload_Clear,
    ImGuiPayload_IsDataType = ImGuiPayload_IsDataType,
    ImGuiPayload_IsDelivery = ImGuiPayload_IsDelivery,
    ImGuiPayload_IsPreview = ImGuiPayload_IsPreview,
    ImGuiPlatformIO = ImGuiPlatformIO,
    ImGuiPlatformImeData = ImGuiPlatformImeData,
    ImGuiPlatformImeData_Compare = ImGuiPlatformImeData_Compare,
    ImGuiPlatformImeData_Copy = ImGuiPlatformImeData_Copy,
    ImGuiPlatformMonitor = ImGuiPlatformMonitor,
    ImGuiPlotArrayGetterData = ImGuiPlotArrayGetterData,
    ImGuiPlotType = ImGuiPlotType,
    ImGuiPopupData = ImGuiPopupData,
    ImGuiPopupFlags = ImGuiPopupFlags,
    ImGuiPopupPositionPolicy = ImGuiPopupPositionPolicy,
    ImGuiScrollFlags = ImGuiScrollFlags,
    ImGuiSelectableFlags = ImGuiSelectableFlags,
    ImGuiSelectionUserData_Invalid = ImGuiSelectionUserData_Invalid,
    ImGuiSeparatorFlags = ImGuiSeparatorFlags,
    ImGuiSettingsHandler = ImGuiSettingsHandler,
    ImGuiShrinkWidthItem = ImGuiShrinkWidthItem,
    ImGuiSliderFlags = ImGuiSliderFlags,
    ImGuiSortDirection = ImGuiSortDirection,
    ImGuiStyle = ImGuiStyle,
    ImGuiStyleMod = ImGuiStyleMod,
    ImGuiStyleVar = ImGuiStyleVar,
    ImGuiStyleVarInfo = ImGuiStyleVarInfo,
    ImGuiTabBar = ImGuiTabBar,
    ImGuiTabBarFlags = ImGuiTabBarFlags,
    ImGuiTabItem = ImGuiTabItem,
    ImGuiTabItemFlags = ImGuiTabItemFlags,
    ImGuiTable = ImGuiTable,
    ImGuiTableBgTarget = ImGuiTableBgTarget,
    ImGuiTableColumn = ImGuiTableColumn,
    ImGuiTableColumnFlags = ImGuiTableColumnFlags,
    ImGuiTableColumnSettings = ImGuiTableColumnSettings,
    ImGuiTableColumnSortSpecs = ImGuiTableColumnSortSpecs,
    ImGuiTableFlags = ImGuiTableFlags,
    ImGuiTableInstanceData = ImGuiTableInstanceData,
    ImGuiTableRowFlags = ImGuiTableRowFlags,
    ImGuiTableSettings = ImGuiTableSettings,
    ImGuiTableSortSpecs = ImGuiTableSortSpecs,
    ImGuiTableTempData = ImGuiTableTempData,
    ImGuiTextBuffer = ImGuiTextBuffer,
    ImGuiTextFilter = ImGuiTextFilter,
    ImGuiTextFlags = ImGuiTextFlags,
    ImGuiTooltipFlags = ImGuiTooltipFlags,
    ImGuiTreeNodeFlags = ImGuiTreeNodeFlags,
    ImGuiViewport = ImGuiViewport,
    ImGuiViewportFlags = ImGuiViewportFlags,
    ImGuiViewportP = ImGuiViewportP,
    ImGuiWindow = ImGuiWindow,
    ImGuiWindowBgClickFlags = ImGuiWindowBgClickFlags,
    ImGuiWindowClass = ImGuiWindowClass,
    ImGuiWindowDockStyleCol = ImGuiWindowDockStyleCol,
    ImGuiWindowFlags = ImGuiWindowFlags,
    ImGuiWindowRefreshFlags = ImGuiWindowRefreshFlags,
    ImGuiWindowSettings = ImGuiWindowSettings,
    ImGuiWindowStackData = ImGuiWindowStackData,
    ImGui_ImplRoblox = ImGui_ImplRoblox,
    ImGui_ImplRoblox_GetBackendData = ImGui_ImplRoblox_GetBackendData,
    ImGui_ImplRoblox_Init = ImGui_ImplRoblox_Init,
    ImGui_ImplRoblox_NewFrame = ImGui_ImplRoblox_NewFrame,
    ImGui_ImplRoblox_RenderDrawData = ImGui_ImplRoblox_RenderDrawData,
    ImGui_ImplRoblox_SetRenderScale = ImGui_ImplRoblox_SetRenderScale,
    ImGui_ImplRoblox_Shutdown = ImGui_ImplRoblox_Shutdown,
    ImGui_ImplRoblox_UpdateTexture = ImGui_ImplRoblox_UpdateTexture,
    ImHashData = ImHashData,
    ImHashStr = ImHashStr,
    ImIsPowerOfTwo = ImIsPowerOfTwo,
    ImLengthSqr = ImLengthSqr,
    ImLerp = ImLerp,
    ImLog = ImLog,
    ImMax = ImMax,
    ImMemchr = ImMemchr,
    ImMin = ImMin,
    ImMul = ImMul,
    ImParseFormatFindStart = ImParseFormatFindStart,
    ImParseFormatSanitizeForScanning = ImParseFormatSanitizeForScanning,
    ImPool = ImPool,
    ImPow = ImPow,
    ImRect = ImRect,
    ImRect_Copy = ImRect_Copy,
    ImRect_CopyFromV4 = ImRect_CopyFromV4,
    ImRotate = ImRotate,
    ImRound64 = ImRound64,
    ImRsqrt = ImRsqrt,
    ImS16 = ImS16,
    ImS32 = ImS32,
    ImS8 = ImS8,
    ImSaturate = ImSaturate,
    ImSin = ImSin,
    ImSqrt = ImSqrt,
    ImStb = ImStb,
    ImStd = ImStd,
    ImStrByte = ImStrByte,
    ImSubClampOverflow = ImSubClampOverflow,
    ImTextClassifierClear = ImTextClassifierClear,
    ImTextClassifierGet = ImTextClassifierGet,
    ImTextClassifierSetCharClass = ImTextClassifierSetCharClass,
    ImTextClassifierSetCharClassFromStr = ImTextClassifierSetCharClassFromStr,
    ImTextInitClassifiers = ImTextInitClassifiers,
    ImTextureData = ImTextureData,
    ImTextureDataGetFormatBytesPerPixel = ImTextureDataGetFormatBytesPerPixel,
    ImTextureDataUpdateNewFrame = ImTextureDataUpdateNewFrame,
    ImTextureFormat = ImTextureFormat,
    ImTextureID_Invalid = ImTextureID_Invalid,
    ImTextureRect = ImTextureRect,
    ImTextureRef = ImTextureRef,
    ImTextureStatus = ImTextureStatus,
    ImTrunc = ImTrunc,
    ImTrunc64 = ImTrunc64,
    ImU16 = ImU16,
    ImU32 = ImU32,
    ImU8 = ImU8,
    ImUpperPowerOfTwo = ImUpperPowerOfTwo,
    ImVec1_Copy = ImVec1_Copy,
    ImVec2 = ImVec2,
    ImVec2_AddVA = ImVec2_AddVA,
    ImVec2_Copy = ImVec2_Copy,
    ImVec2_CopyV = ImVec2_CopyV,
    ImVec2_MulVX = ImVec2_MulVX,
    ImVec2_SubVA = ImVec2_SubVA,
    ImVec4 = ImVec4,
    ImVec4_Copy = ImVec4_Copy,
    ImVector = ImVector,
    ImWcharClass = ImWcharClass,
    NAV_ACTIVATE_HIGHLIGHT_TIMER = NAV_ACTIVATE_HIGHLIGHT_TIMER,
    NAV_ACTIVATE_INPUT_WITH_GAMEPAD_DELAY = NAV_ACTIVATE_INPUT_WITH_GAMEPAD_DELAY,
    NAV_WINDOWING_HIGHLIGHT_DELAY = NAV_WINDOWING_HIGHLIGHT_DELAY,
    STB_TEXTEDIT_K_BACKSPACE = STB_TEXTEDIT_K_BACKSPACE,
    STB_TEXTEDIT_K_DELETE = STB_TEXTEDIT_K_DELETE,
    STB_TEXTEDIT_K_DOWN = STB_TEXTEDIT_K_DOWN,
    STB_TEXTEDIT_K_LEFT = STB_TEXTEDIT_K_LEFT,
    STB_TEXTEDIT_K_LINEEND = STB_TEXTEDIT_K_LINEEND,
    STB_TEXTEDIT_K_LINESTART = STB_TEXTEDIT_K_LINESTART,
    STB_TEXTEDIT_K_PGDOWN = STB_TEXTEDIT_K_PGDOWN,
    STB_TEXTEDIT_K_PGUP = STB_TEXTEDIT_K_PGUP,
    STB_TEXTEDIT_K_REDO = STB_TEXTEDIT_K_REDO,
    STB_TEXTEDIT_K_RIGHT = STB_TEXTEDIT_K_RIGHT,
    STB_TEXTEDIT_K_SHIFT = STB_TEXTEDIT_K_SHIFT,
    STB_TEXTEDIT_K_TEXTEND = STB_TEXTEDIT_K_TEXTEND,
    STB_TEXTEDIT_K_TEXTSTART = STB_TEXTEDIT_K_TEXTSTART,
    STB_TEXTEDIT_K_UNDO = STB_TEXTEDIT_K_UNDO,
    STB_TEXTEDIT_K_UP = STB_TEXTEDIT_K_UP,
    STB_TEXTEDIT_K_WORDLEFT = STB_TEXTEDIT_K_WORDLEFT,
    STB_TEXTEDIT_K_WORDRIGHT = STB_TEXTEDIT_K_WORDRIGHT,
    STB_TEXTEDIT_NEWLINE = STB_TEXTEDIT_NEWLINE,
    STB_TexteditState = STB_TexteditState,
    ShowDockingDisabledMessage = ShowDockingDisabledMessage,
    ShowExampleAppAutoResize = ShowExampleAppAutoResize,
    ShowExampleAppConsole = ShowExampleAppConsole,
    ShowExampleAppConstrainedResize = ShowExampleAppConstrainedResize,
    ShowExampleAppCustomRendering = ShowExampleAppCustomRendering,
    ShowExampleAppFullscreen = ShowExampleAppFullscreen,
    ShowExampleAppLayout = ShowExampleAppLayout,
    ShowExampleAppLog = ShowExampleAppLog,
    ShowExampleAppLongText = ShowExampleAppLongText,
    ShowExampleAppMainMenuBar = ShowExampleAppMainMenuBar,
    ShowExampleAppPropertyEditor = ShowExampleAppPropertyEditor,
    ShowExampleAppSimpleOverlay = ShowExampleAppSimpleOverlay,
    ShowExampleAppWindowTitles = ShowExampleAppWindowTitles,
    ShowExampleMenuFile = ShowExampleMenuFile,
    TILE_SIZE = TILE_SIZE,
    UINT_MAX = UINT_MAX,
    stb_text_locate_coord = stb_text_locate_coord,
    stb_text_makeundo_delete = stb_text_makeundo_delete,
    stb_text_makeundo_insert = stb_text_makeundo_insert,
    stb_text_makeundo_replace = stb_text_makeundo_replace,
    stb_text_redo = stb_text_redo,
    stb_text_undo = stb_text_undo,
    stb_textedit_click = stb_textedit_click,
    stb_textedit_drag = stb_textedit_drag,
    stb_textedit_find_charpos = stb_textedit_find_charpos,
    stb_textedit_key = stb_textedit_key,
    stbrp_init_target = stbrp_init_target,
    stbte = stbte,
    stbtt_FindGlyphIndex = stbtt_FindGlyphIndex,
    stbtt_GetFontOffsetForIndex = stbtt_GetFontOffsetForIndex,
    stbtt_GetFontVMetrics = stbtt_GetFontVMetrics,
    stbtt_GetGlyphBitmapBox = stbtt_GetGlyphBitmapBox,
    stbtt_GetGlyphBitmapBoxSubpixel = stbtt_GetGlyphBitmapBoxSubpixel,
    stbtt_GetGlyphHMetrics = stbtt_GetGlyphHMetrics,
    stbtt_GetGlyphShape = stbtt_GetGlyphShape,
    stbtt_InitFont = stbtt_InitFont,
    stbtt_MakeGlyphBitmapSubpixelPrefilter = stbtt_MakeGlyphBitmapSubpixelPrefilter,
    stbtt_ScaleForPixelHeight = stbtt_ScaleForPixelHeight,
    stbtt__GetGlyphInfoT2 = stbtt__GetGlyphInfoT2,
    stbtt__GetGlyphShapeT2 = stbtt__GetGlyphShapeT2,
    stbtt_fontinfo = stbtt_fontinfo,
}