imgui-luau/tools/test/run.luau

--!native
--!optimize 2
ARG_FRAMES=200; ARG_BIG=false; ARG_OPEN=true; 
local SOURCE_FNS = {}
SOURCE_FNS['ImGui.luau'] = function(game, workspace, Instance, Enum, Vector2, Vector3, UDim2, Color3, Content, warn, require, script, os)
-- 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"

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.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
        -- window.DockOrder = settings.DockOrder
        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

--- @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

-- 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

---------------------------------------------------------------------------------------
-- [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 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)
    error("NOT IMPLEMENTED", 2)
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

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 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) 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 = (bit32.band(flags, ImGuiWindowFlags.NoTitleBar) ~= 0) and ImDrawFlags.RoundCornersAll or ImDrawFlags.RoundCornersBottom
                local bg_draw_list = window.DrawList
                bg_draw_list:AddRectFilled(bg_rect.Min, bg_rect.Max, bg_col, window_rounding, bg_rounding_flags)
            end
        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

        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 then
            RenderWindowOuterBorders(window)
        end
    end

    window.DC.NavLayerCurrent = ImGuiNavLayer.Main
end

--- @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.Collapsed = not window.Collapsed
        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

    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()
    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)
    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

    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)
    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 = ImVec2()
    -- ImVec2_Copy(old_size, window.SizeFull)

    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
    --     TODO: MarkIniSettingsDirty(window)
    -- 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
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)

    -- 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)
    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)

    -- Forward child flags (we allow prior settings to merge but it'll only work for adding flags)
    if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasChildFlags) ~= 0 then
        g.NextWindowData.ChildFlags = bit32.bor(g.NextWindowData.ChildFlags, child_flags)
    else
        g.NextWindowData.ChildFlags = child_flags
    end
    g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasChildFlags)

    -- 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

--- @param window ImGuiWindow
local function 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
    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.RootWindow)

        local moving_window = g.MovingWindow.RootWindow

        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 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
            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

    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

    window.Appearing = window_just_activated_by_user
    if (window.Appearing) then
        SetWindowConditionAllowFlags(window, ImGuiCond.Appearing, true)
    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.ChildFlags 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

    local parent_window_in_stack
    if 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
    -- 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 bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
            window.ParentWindowForFocusRoute = parent_window_in_stack
        else
            window.ParentWindowForFocusRoute = nil
        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

    -- [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()

        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 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 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 (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

        -- TODO: Collapse window by double-clicking on title bar

        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)

        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 (bit32.band(flags, bit32.bor(ImGuiWindowFlags.ChildWindow, ImGuiWindowFlags.Tooltip)) == 0)then
                want_focus = true
            end
        end

        if bit32.band(flags, ImGuiWindowFlags.ChildWindow) ~= 0 then
            window.WindowRounding = style.ChildRounding
        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 = true
        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)
        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)

        do
            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 title_bar_is_highlight = (g.NavWindow == window) -- TODO: proper cond, just simple highlight now

            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
        -- TODO: CurrentColumns
        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 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

        if bit32.band(flags, ImGuiWindowFlags.NoTitleBar) == 0 then
            open = RenderWindowTitleBarContents(window, title_bar_rect, name, open)
        end

        if bit32.band(flags, ImGuiWindowFlags.Tooltip) ~= 0 then
            g.TooltipPreviousWindow = window
        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 (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
        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))

            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
    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 then
        IM_ASSERT_USER_ERROR(g.WithinEndChildID == window.ID, "Must call EndChild() and not End()!")
    end

    if 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

    -- 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

    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
    -- TODO: splitter
    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

    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()

    g.TooltipPreviousWindow = nil

    ImGui.NavUpdate()

    ImGui.UpdateMouseInputs()

    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()

    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()

    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)

    g.WithinFrameScopeWithImplicitWindow = true
    ImGui.SetNextWindowSize(ImVec2(400, 400), ImGuiCond.FirstUseEver)
    ImGui.Begin("Debug##Default")
    IM_ASSERT(g.CurrentWindow.IsFallbackWindow == true)
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()?")

    -- 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()

    ImGui.SetCurrentViewport(nil, nil)

    -- 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

    -- TODO: 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()

    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

--- @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

--- @param window   ImGuiWindow
--- @param scroll_x float
function ImGui.SetScrollX(window, scroll_x)
    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)
    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)
    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)
    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
        if bit32.band(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasChildFlags) ~= 0 then
            g.NextWindowData.ChildFlags = bit32.bor(g.NextWindowData.ChildFlags, ImGuiChildFlags.AlwaysAutoResize)
        else
            g.NextWindowData.ChildFlags = ImGuiChildFlags.AlwaysAutoResize
        end
        g.NextWindowData.HasFlags = bit32.bor(g.NextWindowData.HasFlags, ImGuiNextWindowDataFlags.HasChildFlags)
    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


return true -- [Roblox] ModuleScripts must return exactly one value
end

__FILES['imgui_demo.lua'] = function()
--- ImGui Sincerely WIP
-- (Demo Code)

-- NOTE: Make sure to use fields with different names inside `static`!

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

-- TODO: HelpMarker()
-- TODO: ImColor helpers?

--- @class ImGuiDemoWindowData

--- @return ImGuiDemoWindowData
--- @nodiscard
local function ImGuiDemoWindowData()
    return {
        ShowAppImageViewer = false,
        ShowAppFullscreen = false,

        ShowMetrics = false,
        ShowStyleEditor = false,
    }
end

--- @class ExampleImageViewerData

--- @return ExampleImageViewerData
--- @nodiscard
local 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),
        Zoom         = 10.0,
        ZoomMin      = 1.0,
        ZoomMax      = 10000.0
    }
end

--- @param data ExampleImageViewerData
local 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

--- @param data          ExampleImageViewerData
--- @param canvas_size   ImVec2
--- @param image_tex_ref ImTextureRef
--- @param image_w       int
--- @param image_h       int
local 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)

    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)
    end
    data.ViewReset = false

    if ImGui.SetItemKeyOwner(ImGuiKey.MouseWheelY) then
        if io.MouseWheel ~= 0.0 then
            data.Zoom = IM_CLAMP(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

    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

    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

local function ShowExampleMenuFile()
    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
end

local function DemoWindowMenuBar(demo_data)
    if ImGui.BeginMenuBar() then
        if ImGui.BeginMenu("Menu") then
            ShowExampleMenuFile()
            ImGui.EndMenu()
        end
        if ImGui.BeginMenu("Examples") then
            ImGui.SeparatorText("Concepts")
            _, demo_data.ShowAppFullscreen = ImGui.MenuItem("Fullscreen window", nil, demo_data.ShowAppFullscreen)

            ImGui.EndMenu()
        end
        if ImGui.BeginMenu("Tools") then

local has_debug_tools = false
if not IMGUI_DISABLE_DEBUG_TOOLS then
    has_debug_tools = true
end

            _, demo_data.ShowMetrics = ImGui.MenuItem("Metrics/Debugger", nil, demo_data.ShowMetrics, has_debug_tools)
            _, demo_data.ShowStyleEditor = ImGui.MenuItem("Style Editor", nil, demo_data.ShowStyleEditor)

            ImGui.EndMenu()
        end

        ImGui.EndMenuBar()
    end
end

local DemoWindowWidgetsBasic
do

local static = {}

local clicked = 0
local checked = true
local radio_v = 0

local col0 = ImVec4(0, 0, 0, 1)
local col1 = ImVec4(0, 0, 0, 1)
local col2 = ImVec4(0, 0, 0, 1)

local counter = 0

local str0 = {string.byte("Hello, World!", 1, 13)}
table.insert(str0, 0)

local str1 = {}
str1[1] = 0

local hint0 = {string.byte("enter text here", 1, 15)}
table.insert(hint0, 0)

local vec4a = { 0.10, 0.20, 0.30, 0.44 }

local Element = { Fire = 1, Earth = 2, Air = 3, Water = 4, COUNT = 5 }
local elems_names = { "Fire", "Earth", "Air", "Water" }

function DemoWindowWidgetsBasic()
    if ImGui.TreeNode("Basic") then
        ImGui.SeparatorText("General")

        if ImGui.Button("Button") then
            clicked = clicked + 1
        end

        if clicked % 2 ~= 0 then
            ImGui.SameLine()
            ImGui.Text("Thanks for clicking me!")
        end

        _, check = ImGui.Checkbox("checkbox", check)

        _, radio_v = ImGui.RadioButton("radio a", radio_v, 0) ImGui.SameLine()
        _, radio_v = ImGui.RadioButton("radio b", radio_v, 1) ImGui.SameLine()
        _, radio_v = ImGui.RadioButton("radio c", radio_v, 2)

        ImGui.AlignTextToFramePadding()
        ImGui.TextLinkOpenURL("Hyperlink", "https://github.com/GrayWolf64/imgui-lua")

        for i = 1, 7 do
            if i > 1 then
                ImGui.SameLine()
            end
            ImGui.PushID(i)

            col0.x, col0.y, col0.z = ImGui.ColorConvertHSVtoRGB(i / 7.0, 0.6, 0.6)
            col1.x, col1.y, col1.z = ImGui.ColorConvertHSVtoRGB(i / 7.0, 0.7, 0.7)
            col2.x, col2.y, col2.z = ImGui.ColorConvertHSVtoRGB(i / 7.0, 0.8, 0.8)
            ImGui.PushStyleColor(ImGuiCol.Button, col0)
            ImGui.PushStyleColor(ImGuiCol.ButtonHovered, col1)
            ImGui.PushStyleColor(ImGuiCol.ButtonActive, col2)

            ImGui.Button("Click")

            ImGui.PopStyleColor(3)
            ImGui.PopID()
        end

        -- Use AlignTextToFramePadding() to align text baseline to the baseline of framed widgets elements
        -- (otherwise a Text+SameLine+Button sequence will have the text a little too high by default!)
        -- See 'Demo->Layout->Text Baseline Alignment' for details.
        ImGui.AlignTextToFramePadding()
        ImGui.Text("Hold to repeat:")
        ImGui.SameLine()

        -- Arrow buttons with Repeater
        local spacing = ImGui.GetStyle().ItemInnerSpacing.x
        ImGui.PushItemFlag(ImGuiItemFlags.ButtonRepeat, true)
        if ImGui.ArrowButton("##left", ImGuiDir.Left) then counter = counter - 1 end
        ImGui.SameLine(0.0, spacing)
        if ImGui.ArrowButton("##right", ImGuiDir.Right) then counter = counter + 1 end
        ImGui.PopItemFlag()
        ImGui.SameLine()
        ImGui.Text("%d", counter)

        ImGui.Button("Tooltip")
        ImGui.SetItemTooltip("I am a tooltip")

        ImGui.LabelText("label", "Value")

        ImGui.SeparatorText("Inputs")

        do
            ImGui.InputText("input text", str0, 128)

            ImGui.InputTextWithHint("input text (w/ hint)", hint0, str1, 128)

            if not static.i0 then static.i0 = 233 end
            static.i0 = ImGui.InputInt("input int", static.i0)

            if not static.f0 then static.f0 = 0.001 end
            static.f0 = ImGui.InputFloat("input float", static.f0, 0.01, 1.0)

            if not static.d0 then static.d0 = 999999.00000001 end
            static.d0 = ImGui.InputDouble("input double", static.d0, 0.01, 1.0, "%.8f")
            -- TODO:

            ImGui.InputFloat3("input float3", vec4a)
        end

        ImGui.SeparatorText("Drags")

        do
            if not static.i1 then static.i1 = 50  end
            if not static.i2 then static.i2 = 42  end
            if not static.i3 then static.i3 = 128 end
            static.i1 = ImGui.DragInt("drag int", static.i1, 1)
            static.i2 = ImGui.DragInt("drag int 0..100", static.i2, 1, 0, 100, "%d%%", ImGuiSliderFlags.AlwaysClamp)
            static.i3 = ImGui.DragInt("drag int wrap 100..200", static.i3, 1, 100, 200, "%d", ImGuiSliderFlags.WrapAround)

            if not static.f1 then static.f1 = 1.00   end
            if not static.f2 then static.f2 = 0.0067 end
            static.f1 = ImGui.DragFloat("drag float", static.f1, 0.005)
            static.f2 = ImGui.DragFloat("drag small float", static.f2, 0.0001, 0.0, 0.0, "%.06f ns")
        end

        ImGui.SeparatorText("Sliders")

        do
            if not static.f01 then static.f01 = 0.123 end
            if not static.f02 then static.f02 = 0.0   end
            static.f01 = ImGui.SliderFloat("slider float", static.f01, 0.0, 1.0, "ratio = %.3f")
            static.f02 = ImGui.SliderFloat("slider float (log)", static.f02, -10.0, 10.0, "%.4f", ImGuiSliderFlags.Logarithmic)

            if not static.angle then static.angle = 0.0 end
            static.angle = ImGui.SliderAngle("slider angle", static.angle)

            if not static.elem then static.elem = Element.Fire end
            local elem_name = (static.elem >= 1 and static.elem < Element.COUNT) and elems_names[static.elem] or "Unknown"
            static.elem = ImGui.SliderInt("slider enum", static.elem, 1, Element.COUNT - 1, elem_name)
        end

        ImGui.TreePop()
    end
end

end

local function DemoWindowWidgetsBullets()
    if ImGui.TreeNode("Bullets") then
        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
end

local DemoWindowWidgetsColorAndPickers
do

local color = {114.0 / 255.0, 144.0 / 255.0, 154.0 / 255.0, 200.0 / 255.0}
local base_flags = ImGuiColorEditFlags.None

local ref_color = false
local ref_color_v = {1.0, 0.0, 1.0, 0.5}
local picker_mode = 0
local display_mode = 0
local color_picker_flags = ImGuiColorEditFlags.AlphaBar
local picker_mode_names = {"Auto/Current", "ImGuiColorEditFlags.PickerHueBar", "ImGuiColorEditFlags.PickerHueWheel"}
local display_mode_names = {"Auto/Current", "ImGuiColorEditFlags.NoInputs", "ImGuiColorEditFlags.DisplayRGB", "ImGuiColorEditFlags.DisplayHSV", "ImGuiColorEditFlags.DisplayHex"}

function DemoWindowWidgetsColorAndPickers()
    if ImGui.TreeNode("Color/Picker Widgets") then
        ImGui.SeparatorText("Options")

        _, base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.NoAlpha", base_flags, ImGuiColorEditFlags.NoAlpha)
        _, base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.AlphaOpaque", base_flags, ImGuiColorEditFlags.AlphaOpaque)
        _, base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.AlphaNoBg", base_flags, ImGuiColorEditFlags.AlphaNoBg)
        _, base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.AlphaPreviewHalf", base_flags, ImGuiColorEditFlags.AlphaPreviewHalf)
        _, base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.NoOptions", base_flags, ImGuiColorEditFlags.NoOptions)
        _, base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.NoDragDrop", base_flags, ImGuiColorEditFlags.NoDragDrop)
        _, base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.NoColorMarkers", base_flags, ImGuiColorEditFlags.NoColorMarkers)
        _, base_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.HDR", base_flags, ImGuiColorEditFlags.HDR)

        ImGui.SeparatorText("Inline color editor")
        ImGui.Text("Color widget:")
        ImGui.ColorEdit3("MyColor##1", color, base_flags)

        ImGui.Text("Color widget HSV with Alpha:")
        ImGui.ColorEdit4("MyColor##2", color, bit32.bor(ImGuiColorEditFlags.DisplayHSV, base_flags))

        ImGui.Text("Color widget with Float Display:")
        ImGui.ColorEdit4("MyColor##2f", color, bit32.bor(ImGuiColorEditFlags.Float, base_flags))

        ImGui.Text("Color button with Picker:")
        ImGui.ColorEdit4("MyColor##3", color, bit32.bor(ImGuiColorEditFlags.NoInputs, ImGuiColorEditFlags.NoLabel, base_flags))

        -- TODO:

        ImGui.SeparatorText("Color picker")

        ImGui.PushID("Color picker")
        _, color_picker_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.NoAlpha", color_picker_flags, ImGuiColorEditFlags.NoAlpha)
        _, color_picker_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.AlphaBar", color_picker_flags, ImGuiColorEditFlags.AlphaBar)
        _, color_picker_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.NoSidePreview", color_picker_flags, ImGuiColorEditFlags.NoSidePreview)

        if bit32.band(color_picker_flags, ImGuiColorEditFlags.NoSidePreview) ~= 0 then
            ImGui.SameLine()
            _, ref_color = ImGui.Checkbox("With Ref Color", ref_color)
            if ref_color then
                ImGui.SameLine()
                ImGui.ColorEdit4("##RefColor", ref_color_v, bit32.bor(ImGuiColorEditFlags.NoInputs, base_flags))
            end
        end
        _, color_picker_flags = ImGui.CheckboxFlags("ImGuiColorEditFlags.PickerNoRotate", color_picker_flags, ImGuiColorEditFlags.PickerNoRotate)

        if ImGui.BeginCombo("Picker Mode", picker_mode_names[picker_mode + 1], ImGuiComboFlags.None) then
            for mode_idx, mode_name in ipairs(picker_mode_names) do
                local pressed = ImGui.Selectable(mode_name, mode_idx == picker_mode + 1)
                if pressed then
                    picker_mode = mode_idx - 1
                end
            end
            ImGui.EndCombo()
        end

        if ImGui.BeginCombo("Display Mode", display_mode_names[display_mode + 1], ImGuiComboFlags.None) then
            for mode_idx, mode_name in ipairs(display_mode_names) do
                local pressed = ImGui.Selectable(mode_name, mode_idx == display_mode + 1)
                if pressed then
                    display_mode = mode_idx - 1
                end
            end
            ImGui.EndCombo()
        end

        local flags = bit32.bor(base_flags, color_picker_flags)
        if picker_mode == 1 then flags = bit32.bor(flags, ImGuiColorEditFlags.PickerHueBar) end
        if picker_mode == 2 then flags = bit32.bor(flags, ImGuiColorEditFlags.PickerHueWheel) end
        if display_mode == 1 then flags = bit32.bor(flags, ImGuiColorEditFlags.NoInputs) end   -- Disable all RGB/HSV/Hex displays
        if display_mode == 2 then flags = bit32.bor(flags, ImGuiColorEditFlags.DisplayRGB) end -- Override display mode
        if display_mode == 3 then flags = bit32.bor(flags, ImGuiColorEditFlags.DisplayHSV) end
        if display_mode == 4 then flags = bit32.bor(flags, ImGuiColorEditFlags.DisplayHex) end

        ImGui.ColorPicker4("MyColor##4", color, flags, ref_color and ref_color_v or nil)

        ImGui.TreePop()
    end
end

end

local DemoWindowWidgetsImages do

local pressed_count = 0

local image_viewer = ExampleImageViewerData()

function DemoWindowWidgetsImages()
    if ImGui.TreeNode("Images") then
        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!"
        )

        -- Grab the current texture identifier used by the font atlas
        local io = ImGui.GetIO()

        local atlas = io.Fonts
        local my_tex_id = atlas.TexRef
        local my_tex_w = atlas.TexData.Width
        local my_tex_h = atlas.TexData.Height
        ImGui.Text("%.0fx%.0f", my_tex_w, my_tex_h)

        ImGui.SeparatorText("Image()/ImageWithBg() function")
        local uv_min = ImVec2(0.0, 0.0)
        local uv_max = ImVec2(1.0, 1.0)
        ImGui.PushStyleVar(ImGuiStyleVar.ImageBorderSize, IM_MAX(1.0, ImGui.GetStyle().ImageBorderSize))
        ImGui.ImageWithBg(my_tex_id, ImVec2(my_tex_w, my_tex_h), uv_min, uv_max, ImVec4(0.0, 0.0, 0.0, 1.0))
        ImGui.PopStyleVar()

        -- Fancy widget
        ImGui.SeparatorText("Interactive Image Viewer")

        local canvas_size = ImVec2(ImGui.GetContentRegionAvail().x, my_tex_h * 2.0)
        ExampleImageViewer_DrawOptions(image_viewer)
        ExampleImageViewer_DrawCanvas(image_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 = 1, 8 do
            -- UV coordinates are often (0.0f, 0.0f) and (1.0f, 1.0f) to display an entire textures.
            -- Here are trying to display only a 32x32 pixels area of the texture, hence the UV computation.
            ImGui.PushID(i)
            if i > 1 then
                ImGui.PushStyleVar(ImGuiStyleVar.FramePadding, ImVec2(i, i))
            end

            local size = ImVec2(32.0, 32.0) -- Size of the image we want to make visible
            local uv0 = ImVec2(0.0, 0.0) -- UV coordinates for lower-left
            local uv1 = ImVec2(32.0 / my_tex_w, 32.0 / my_tex_h) -- UV coordinates for (32,32) in our texture
            local bg_col = ImVec4(0.0, 0.0, 0.0, 1.0) -- Black background
            local tint_col = ImVec4(1.0, 1.0, 1.0, 1.0) -- No tint

            if ImGui.ImageButton("", my_tex_id, size, uv0, uv1, bg_col, tint_col) then
                pressed_count = pressed_count + 1
            end

            if i > 1 then
                ImGui.PopStyleVar()
            end

            ImGui.PopID()
            ImGui.SameLine()
        end

        ImGui.NewLine()
        ImGui.Text("Pressed %d times.", pressed_count)

        ImGui.TreePop()
    end
end

end

local function DemoWindowWidgetsLiveEdit()
    -- TODO:
end

local DemoWindowWidgetsPlotting
do

local animate = true
local arr = { 0.6, 0.1, 1.0, 0.5, 0.92, 0.1, 0.2 }

local values_sz = 90
local values = {} for i = 1, values_sz do values[i] = 0 end
local values_offset = 0
local refresh_time = 0.0
local phase = 0.0

function DemoWindowWidgetsPlotting()
    if ImGui.TreeNode("Plotting") then
        _, animate = ImGui.Checkbox("Animate", animate)

        -- Plot as lines and plot as histogram
        ImGui.PlotLines("Frame Times", arr, nil, #arr)
        ImGui.PlotHistogram("Histogram", arr, nil, #arr, 0, nil, 0.0, 1.0, ImVec2(0, 80.0))

        if not animate or refresh_time == 0.0 then
            refresh_time = ImGui.GetTime()
        end
        while refresh_time < ImGui.GetTime() do -- Create data at fixed 60 Hz rate for the demo
            values[values_offset + 1] = math.cos(phase)
            values_offset = (values_offset + 1) % values_sz
            phase = phase + 0.10 * values_offset
            refresh_time = refresh_time + 1.0 / 60.0
        end

        -- Plots can display overlay texts
        -- (in this example, we will display an average value)
        do
            local average = 0.0
            for i = 1, values_sz do
                average = average + values[i]
            end
            average = average / values_sz
            local overlay = string.format("avg %f", average)
            ImGui.PlotLines("Lines", values, nil, values_sz, values_offset, overlay, -1.0, 1.0, ImVec2(0, 80.0))
        end

        ImGui.TreePop()
    end
end

end

local DemoWindowWidgetsProgressBars do

local progress_accum = 0.0
local progress_dir = 1.0

function DemoWindowWidgetsProgressBars()
    if ImGui.TreeNode("Progress Bars") then
        -- Animate a simple progress bar
        progress_accum = progress_accum + progress_dir * 0.4 * ImGui.GetIO().DeltaTime
        if progress_accum >= 1.1 then
            progress_accum = 1.1
            progress_dir = progress_dir * -1.0
        end

        if progress_accum <= -0.1 then
            progress_accum = -0.1
            progress_dir = progress_dir * -1.0
        end

        local progress = IM_CLAMP(progress_accum, 0.0, 1.0)

        -- Typically we would use ImVec2(-1.0,0.0) or ImVec2(-math.huge,0.0) to use all available width,
        -- or ImVec2(width,0.0) for a specified width. ImVec2(0.0,0.0) uses ItemWidth
        ImGui.ProgressBar(progress, ImVec2(0.0, 0.0))
        ImGui.SameLine(0.0, ImGui.GetStyle().ItemInnerSpacing.x)
        ImGui.Text("Progress Bar")

        local buf = string.format("%d/%d", math.floor(progress * 1753), 1753)
        ImGui.ProgressBar(progress, ImVec2(0.0, 0.0), buf)

        -- Pass an animated negative value, e.g. -1.0 * ImGui.GetTime() is the recommended value
        -- Adjust the factor if you want to adjust the animation speed
        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
end

end

local DemoWindowWidgetsVerticalSliders do

local int_value = 0
local values = { 0.0, 0.60, 0.35, 0.9, 0.70, 0.20, 0.0 }
local values2 = { 0.20, 0.80, 0.40, 0.25 }

local col0 = ImVec4(0, 0, 0, 1)
local col1 = ImVec4(0, 0, 0, 1)
local col2 = ImVec4(0, 0, 0, 1)
local col3 = ImVec4(0, 0, 0, 1)

function DemoWindowWidgetsVerticalSliders()
    if ImGui.TreeNode("Vertical Sliders") then
        local spacing = 4
        ImGui.PushStyleVar(ImGuiStyleVar.ItemSpacing, ImVec2(spacing, spacing))

        int_value = ImGui.VSliderInt("##int", ImVec2(18, 160), int_value, 0, 5)
        ImGui.SameLine()

        ImGui.PushID("set1")
        for i = 1, 7 do
            if i > 1 then ImGui.SameLine() end
            ImGui.PushID(i)
            local hue = (i - 1) / 7.0
            col0.x, col0.y, col0.z = ImGui.ColorConvertHSVtoRGB(hue, 0.5, 0.5)
            col1.x, col1.y, col1.z = ImGui.ColorConvertHSVtoRGB(hue, 0.6, 0.5)
            col2.x, col2.y, col2.z = ImGui.ColorConvertHSVtoRGB(hue, 0.7, 0.5)
            col3.x, col3.y, col3.z = ImGui.ColorConvertHSVtoRGB(hue, 0.9, 0.9)
            ImGui.PushStyleColor(ImGuiCol.FrameBg, col0)
            ImGui.PushStyleColor(ImGuiCol.FrameBgHovered, col1)
            ImGui.PushStyleColor(ImGuiCol.FrameBgActive, col2)
            ImGui.PushStyleColor(ImGuiCol.SliderGrab, col3)
            values[i] = ImGui.VSliderFloat("##v", ImVec2(18, 160), values[i], 0.0, 1.0, "")
            if ImGui.IsItemActive() or ImGui.IsItemHovered() then
                ImGui.SetTooltip("%.3f", values[i])
            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 = 1, 4 do
            if nx > 1 then ImGui.SameLine() end
            ImGui.BeginGroup()
            for ny = 1, rows do
                ImGui.PushID((nx - 1) * rows + ny)
                values2[nx] = ImGui.VSliderFloat("##v", small_slider_size, values2[nx], 0.0, 1.0, "")
                if ImGui.IsItemActive() or ImGui.IsItemHovered() then
                    ImGui.SetTooltip("%.3f", values2[nx])
                end
                ImGui.PopID()
            end
            ImGui.EndGroup()
        end
        ImGui.PopID()

        ImGui.SameLine()
        ImGui.PushID("set3")
        for i = 1, 4 do
            if i > 1 then ImGui.SameLine() end
            ImGui.PushID(i)
            ImGui.PushStyleVar(ImGuiStyleVar.GrabMinSize, 40)
            values[i] = ImGui.VSliderFloat("##v", ImVec2(40, 160), values[i], 0.0, 1.0, "%.2f\nsec")
            ImGui.PopStyleVar()
            ImGui.PopID()
        end
        ImGui.PopID()

        ImGui.PopStyleVar()

        ImGui.TreePop()
    end
end

end

local function DemoWindowWidgets()
    if not ImGui.CollapsingHeader("Widgets") then
        return
    end

    DemoWindowWidgetsBasic()
    DemoWindowWidgetsBullets()
    DemoWindowWidgetsColorAndPickers()
    DemoWindowWidgetsImages()
    DemoWindowWidgetsLiveEdit()
    DemoWindowWidgetsPlotting()
    DemoWindowWidgetsProgressBars()
    DemoWindowWidgetsVerticalSliders()
end

local function DemoWindowLayout()
    if not ImGui.CollapsingHeader("Layout & Scrolling") then
        return
    end

end

local function DemoWindowPopups()
    if not ImGui.CollapsingHeader("Popups & Modal windows") then
        return
    end

end

local function DemoWindowTables()
    if not ImGui.CollapsingHeader("Tables & Columns") then
        return
    end

end

local function DemoWindowInputs()
    if not ImGui.CollapsingHeader("Inputs & Focus") then
        return
    end

end

do

local static = {}

local style_idx = -1
local style_names = { "Dark", "Light", "Classic" }

--- @param label string
function ImGui.ShowStyleSelector(label)
    local ret = false
    if ImGui.BeginCombo(label, (style_idx >= 1 and style_idx <= #style_names) and style_names[style_idx] or "") then
        for n = 1, #style_names do
            if ImGui.Selectable(style_names[n], style_idx == n, ImGuiSelectableFlags.SelectOnNav) then
                style_idx = n
                ret = true

                if style_idx == 1 then ImGui.StyleColorsDark() end
                if style_idx == 2 then ImGui.StyleColorsLight() end
                if style_idx == 3 then ImGui.StyleColorsClassic() end

            elseif style_idx == n then
                ImGui.SetItemDefaultFocus()
            end
        end
        ImGui.EndCombo()
    end
    return ret
end

--- @param label string
function ImGui.ShowFontSelector(label)
    local io = ImGui.GetIO()
    local font_current = ImGui.GetFont()
    if ImGui.BeginCombo(label, font_current:GetDebugName()) then
        for _, font in io.Fonts.Fonts:iter() do
            ImGui.PushID(tostring(font):match("0x%x+")) -- (void*)font
            if ImGui.Selectable(font:GetDebugName(), font == font_current, ImGuiSelectableFlags.SelectOnNav) then
                io.FontDefault = font
            end
            if font == font_current then
                ImGui.SetItemDefaultFocus()
            end
            ImGui.PopID()
        end
        ImGui.EndCombo()
    end
end

--- @param ref ImGuiStyle?
function ImGui.ShowStyleEditor(ref)
    local style = ImGui.GetStyle()

    local default_border_size = ImTrunc(style._MainScale)
    local max_border_size = ImMax(default_border_size, 2.0)

    ImGui.PushItemWidth(ImGui.GetWindowWidth() * 0.50)

    ImGui.SeparatorText("General")
    do
        if ImGui.ShowStyleSelector("Colors##Selector") then
            -- TODO:
        end
        ImGui.ShowFontSelector("Fonts##Selector")

        local ret0
        style.FontSizeBase, ret0 = ImGui.DragFloat("FontSizeBase", style.FontSizeBase, 0.20, 5.0, 100.0, "%.0f")
        if ret0 then
            style._NextFrameFontSizeBase = style.FontSizeBase -- FIXME: Temporary hack until we finish remaining work.
        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)
            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()

        local ret1
        style.FrameRounding, ret1 = ImGui.SliderFloat("FrameRounding", style.FrameRounding, 0.0, 12.0, "%.0f")
        if ret1 then
            style.GrabRounding = style.FrameRounding -- Make GrabRounding always the same value as FrameRounding
        end

        do
            local border = (style.WindowBorderSize > 0.0)
            local pressed
            pressed, border = ImGui.Checkbox("WindowBorder", border)
            if pressed then style.WindowBorderSize = (border and default_border_size or 0.0) end
        end
        ImGui.SameLine()
        do
            local border = (style.FrameBorderSize > 0.0)
            local pressed
            pressed, border = ImGui.Checkbox("FrameBorder", border)
            if pressed then style.FrameBorderSize = (border and default_border_size or 0.0) end
        end
        ImGui.SameLine()
        do
            local border = (style.PopupBorderSize > 0.0)
            local pressed
            pressed, border = ImGui.Checkbox("PopupBorder", border)
            if pressed then style.PopupBorderSize = (border and default_border_size or 0.0) end
        end
    end

    ImGui.SeparatorText("Details")
    -- TODO:

    ImGui.PopItemWidth()
end

end

local function ShowExampleAppImageViewer()
    -- TODO:
end

local ShowExampleAppFullscreen do

local use_work_area = true
local flags = bit32.bor(ImGuiWindowFlags.NoDecoration, ImGuiWindowFlags.NoMove, ImGuiWindowFlags.NoSavedSettings)

function ShowExampleAppFullscreen(open)
    local viewport = ImGui.GetMainViewport()
    ImGui.SetNextWindowPos(use_work_area and viewport.WorkPos or viewport.Pos)
    ImGui.SetNextWindowSize(use_work_area and viewport.WorkSize or viewport.Size)

    local ret
    open, ret = ImGui.Begin("Example: Fullscreen window", open, flags)
    if ret then
        _, use_work_area = ImGui.Checkbox("Use work area instead of main area", use_work_area)
        ImGui.SameLine()

        _, flags = ImGui.CheckboxFlags("ImGuiWindowFlags.NoBackground", flags, ImGuiWindowFlags.NoBackground)
        _, flags = ImGui.CheckboxFlags("ImGuiWindowFlags.NoDecoration", flags, ImGuiWindowFlags.NoDecoration)
        ImGui.Indent()
        _, flags = ImGui.CheckboxFlags("ImGuiWindowFlags.NoTitleBar", flags, ImGuiWindowFlags.NoTitleBar)
        _, flags = ImGui.CheckboxFlags("ImGuiWindowFlags.NoCollapse", flags, ImGuiWindowFlags.NoCollapse)
        _, flags = ImGui.CheckboxFlags("ImGuiWindowFlags.NoScrollbar", flags, ImGuiWindowFlags.NoScrollbar)
        ImGui.Unindent()

        if open and ImGui.Button("Close this window") then
            open = false
        end
    end
    ImGui.End()

    return open
end

end

do

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

function ImGui.ShowDemoWindow(open)
    if demo_data.ShowAppFullscreen then demo_data.ShowAppFullscreen = ShowExampleAppFullscreen(demo_data.ShowAppFullscreen) end

    if demo_data.ShowMetrics then
        demo_data.ShowMetrics = ImGui.ShowMetricsWindow(demo_data.ShowMetrics)
    end
    if demo_data.ShowStyleEditor then
        demo_data.ShowStyleEditor = ImGui.Begin("ImGui Sincerely Style Editor", demo_data.ShowStyleEditor)
        ImGui.ShowStyleEditor()
        ImGui.End()
    end

    local window_flags = 0
    if no_titlebar       then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoTitleBar) end
    if no_scrollbar      then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoScrollbar) end
    if not no_menu       then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.MenuBar) end
    if no_move           then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoMove) end
    if no_resize         then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoResize) end
    if no_collapse       then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoCollapse) end
    if no_nav            then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoNav) end
    if no_background     then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoBackground) end
    if no_bring_to_front then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoBringToFrontOnFocus) end
    if no_docking        then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.NoDocking) end
    if unsaved_document  then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.UnsavedDocument) end
    if no_close          then open = nil end

    if not no_menu then window_flags = bit32.bor(window_flags, ImGuiWindowFlags.MenuBar) end

    local ret -- is_visible
    open, ret = ImGui.Begin("ImGui Sincerely Demo", open, window_flags)
    if not ret then
        ImGui.End()
        return open
    end

    local label_width_base = ImGui.GetFontSize() * 12
    local label_width_max = ImGui.GetContentRegionAvail().x * 0.40
    local label_width = IM_MIN(label_width_base, label_width_max)
    ImGui.PushItemWidth(-label_width)

    DemoWindowMenuBar(demo_data)

    if ImGui.CollapsingHeader("Help") then
        ImGui.SeparatorText("ABOUT THIS DEMO:")
    end

    if ImGui.CollapsingHeader("Configuration") then
        
    end

    if ImGui.CollapsingHeader("Window Options") then
        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

    DemoWindowWidgets()
    DemoWindowLayout()
    DemoWindowPopups()
    DemoWindowTables()
    DemoWindowInputs()

    ImGui.End()

    return open
end

end


return true -- [Roblox] ModuleScripts must return exactly one value
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.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.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.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

-- 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()
    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

--- @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: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)
    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


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

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
function ImDrawListSplitter() return { _Current = 0, _Count = 0, _Channels = ImVector() } 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),
    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,

        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,
        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),
    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)
}

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.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,
    PlotLines                 = 42,
    PlotLinesHovered          = 43,
    PlotHistogram             = 44,
    PlotHistogramHovered      = 45,
    TableHeaderBg             = 46,
    TableBorderStrong         = 47,
    TableBorderLight          = 48,
    TableRowBg                = 49,
    TableRowBgAlt             = 50,
    TextLink                  = 51,
    TextSelectedBg            = 52,
    TreeLines                 = 53,
    DragDropTarget            = 54,
    DragDropTargetBg          = 55,
    UnsavedMarker             = 56,
    NavCursor                 = 57,
    NavWindowingHighlight     = 58,
    NavWindowingDimBg         = 59,
    ModalWindowDimBg          = 60,
    COUNT                     = 61
}

--- @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
function ImGuiInputTextCallbackData()
    return {}
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,
}


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.
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
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

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)
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.
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)
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.
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)

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
    label.Size = UDim2.fromOffset(TILE, TILE)
    label.Position = UDim2.fromOffset(tx * TILE, ty * TILE)
    label.ResampleMode = Enum.ResamplerMode.Pixelated
    label.ImageContent = Content.fromObject(img)
    label.Visible = false
    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

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
function ImGui_ImplRoblox_Init(parent)
    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, 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), floor(screen.Y)
    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, m.Y)
    end
end

ImGui_ImplRoblox = {
    Init           = ImGui_ImplRoblox_Init,
    Shutdown       = ImGui_ImplRoblox_Shutdown,
    NewFrame       = ImGui_ImplRoblox_NewFrame,
    RenderDrawData = ImGui_ImplRoblox_RenderDrawData,
    AddFile        = ImGui_ImplRoblox_AddFile,
}

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

--- @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

function IM_ASSERT_USER_ERROR(_EXPR, _MSG) if not (_EXPR) or (_EXPR) == 0 then error(_MSG, 2) 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 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,
        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,
        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>

--- @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(),

        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
        SettingsWindows = ImVector(),

        -- Drag and Drop
        DragDropActive = false,
        DragDropWithinSource = false,
        DragDropWithinTarget = false,
        DragDropSourceFlags = 0,

        DragDropAcceptIdPrev = 0, DragDropAcceptIdCurr = 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(),
    }

    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         = "",
    }, 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 {
        CursorPos         = ImVec2(),
        CursorPosPrevLine = ImVec2(),
        CursorStartPos    = ImVec2(),
        CursorMaxPos      = ImVec2(),
        IdealMaxPos       = ImVec2(),
        CurrLineSize      = ImVec2(),
        PrevLineSize      = ImVec2(),

        CurrLineTextBaseOffset = 0,
        PrevLineTextBaseOffset = 0,

        IsSameLine = false,
        IsSetPos = false,

        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(),
        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 = {},

        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")

    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)

--- @type ImGuiContext?
local GImGui

-- 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

--- @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)
    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

    -- TODO:
    return true
end

function ImGui.EndTable()
    -- TODO:
end

function ImGui.TableNextColumn()
    -- TODO:
end

function ImGui.TablePushBackgroundChannel()
    -- TODO:
end

function ImGui.TablePopBackgroundChannel()
    -- TODO:
end

return true -- [Roblox] ModuleScripts must return exactly one value
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

----------------------------------------------------------------
-- [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

--- @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

----------------------------------------------------------------
-- [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)
    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

--- @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)
    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

----------------------------------------------------------------
-- [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

--- @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)
    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

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
function ImGui.InputTextEx(label, hint, buf, buf_size, size_arg, flags, callback, callback_user_data)
    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)
    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

    return ImGui.ColorEdit4(label, col, bit32.bor(flags, ImGuiColorEditFlags.NoAlpha))
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)
    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
----------------------------------------------------------------

--- @param label string
function ImGui.TreeNode(label)
    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

--- @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 ~= 0
            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 = window.DC.TreeHasStackDataDepthMask or bit32.lshift(1, window.DC.TreeDepth)
    if bit32.band(flags, ImGuiTreeNodeFlags.DrawLinesToNodes) ~= 0 then
        window.DC.TreeRecordsClippedNodesY2Mask = window.DC.TreeRecordsClippedNodesY2Mask or 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
            ImGui.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 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 = (ImU8)((cond ~= 0) and cond or ImGuiCond.Always)
end

--- @param label  string
--- @param flags? ImGuiTreeNodeFlags
function ImGui.CollapsingHeader(label, flags)
    if flags == nil then flags = 0 end

    local window = ImGui.GetCurrentWindow()
    if window.SkipItems then
        return false
    end
    local id = window:GetID(label)
    return ImGui.TreeNodeBehavior(id, bit32.bor(flags, ImGuiTreeNodeFlags.CollapsingHeader), label)
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] 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

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')

return {
    BuildLoadGlyphGetAdvanceOrFallback = BuildLoadGlyphGetAdvanceOrFallback,
    CalcNextScrollFromScrollTargetAndClamp = CalcNextScrollFromScrollTargetAndClamp,
    DBL_MAX = DBL_MAX,
    DemoWindowWidgetsBasic = DemoWindowWidgetsBasic,
    DemoWindowWidgetsColorAndPickers = DemoWindowWidgetsColorAndPickers,
    DemoWindowWidgetsImages = DemoWindowWidgetsImages,
    DemoWindowWidgetsPlotting = DemoWindowWidgetsPlotting,
    DemoWindowWidgetsProgressBars = DemoWindowWidgetsProgressBars,
    DemoWindowWidgetsVerticalSliders = DemoWindowWidgetsVerticalSliders,
    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,
    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_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_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_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,
    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,
    ImGuiDataType = ImGuiDataType,
    ImGuiDebugLogFlags = ImGuiDebugLogFlags,
    ImGuiDir = ImGuiDir,
    ImGuiDragDropFlags = ImGuiDragDropFlags,
    ImGuiFocusRequestFlags = ImGuiFocusRequestFlags,
    ImGuiFocusScopeData = ImGuiFocusScopeData,
    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,
    ImGuiLocKey = ImGuiLocKey,
    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,
    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,
    ImGuiSliderFlags = ImGuiSliderFlags,
    ImGuiStyle = ImGuiStyle,
    ImGuiStyleMod = ImGuiStyleMod,
    ImGuiStyleVar = ImGuiStyleVar,
    ImGuiStyleVarInfo = ImGuiStyleVarInfo,
    ImGuiTableFlags = ImGuiTableFlags,
    ImGuiTextFlags = ImGuiTextFlags,
    ImGuiTooltipFlags = ImGuiTooltipFlags,
    ImGuiTreeNodeFlags = ImGuiTreeNodeFlags,
    ImGuiViewport = ImGuiViewport,
    ImGuiViewportFlags = ImGuiViewportFlags,
    ImGuiViewportP = ImGuiViewportP,
    ImGuiWindow = ImGuiWindow,
    ImGuiWindowBgClickFlags = ImGuiWindowBgClickFlags,
    ImGuiWindowClass = ImGuiWindowClass,
    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_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,
    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,
    ShowExampleAppFullscreen = ShowExampleAppFullscreen,
    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,
}

end
SOURCE_FNS['main.client.luau'] = function(game, workspace, Instance, Enum, Vector2, Vector3, UDim2, Color3, Content, warn, require, script, os)
-- LocalScript. Build the library first: `python3 tools/bundle.py` -> build/ImGui.luau (see default.project.json)

local ReplicatedStorage = game:GetService("ReplicatedStorage")
local RunService = game:GetService("RunService")

local G = require(ReplicatedStorage:WaitForChild("ImGui"))

local ImGui, ImVec4, ImGuiConfigFlags, ImGui_ImplRoblox = G.ImGui, G.ImVec4, G.ImGuiConfigFlags, G.ImGui_ImplRoblox

local main_scale = 1.0
local clear_color = ImVec4(0.45, 0.55, 0.60, 1.00)
local show_demo_window = true
local show_another_window = false
local f = 0.0
local counter = 0

ImGui.CreateContext()

local io = ImGui.GetIO()
io.ConfigFlags = bit32.bor(io.ConfigFlags, ImGuiConfigFlags.NavEnableKeyboard)

local style = ImGui.GetStyle()
style:ScaleAllSizes(main_scale)
style.FontScaleDpi = main_scale

ImGui_ImplRoblox.Init()

RunService.Stepped:Connect(function()
    ImGui_ImplRoblox.NewFrame()
    ImGui.NewFrame()

    if show_demo_window then
        ImGui.ShowDemoWindow()
    end

    do
        ImGui.Begin("Hello, world!")

        ImGui.Text("This is some useful text.")
        local _
        _, show_demo_window = ImGui.Checkbox("Demo Window", show_demo_window)
        _, show_another_window = ImGui.Checkbox("Another Window", show_another_window)

        f = ImGui.SliderFloat("float", f, 0.0, 1.0)
        ImGui.ColorEdit3("clear color", clear_color)

        if ImGui.Button("Button") then
            counter = counter + 1
        end
        ImGui.SameLine()
        ImGui.Text("counter = %d", counter)

        ImGui.Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0 / io.Framerate, io.Framerate)

        ImGui.End()
    end

    if show_another_window then
        show_another_window = ImGui.Begin("Another Window", show_another_window)

        ImGui.Text("Hello from another window!")
        if ImGui.Button("Close Me") then
            show_another_window = false
        end

        ImGui.End()
    end

    ImGui.EndFrame()
    ImGui.Render()
    ImGui_ImplRoblox.RenderDrawData(ImGui.GetDrawData())
end)

end
-- Minimal Roblox mock for running the imgui Roblox backend + the real CanvasDraw module in the Luau CLI.
local realG = {} -- (no getfenv: it would mark the global env unsafe and deoptimize everything)
FAKE_TIME = 0
local SCREEN_W, SCREEN_H = 1920, 1080
local NFRAMES = tonumber(ARG_FRAMES) or 400
local FORCE = ARG_FORCE == true
local DUMP_FRAMES = { [60] = true, [200] = true, [NFRAMES] = true }

local function Signal()
    local s = { conns = {} }
    function s:Connect(fn)
        local c = { fn = fn, Connected = true }
        function c:Disconnect() c.Connected = false end
        table.insert(s.conns, c)
        return c
    end
    function s:Fire(...) for _, c in ipairs(s.conns) do if c.Connected then c.fn(...) end end end
    return s
end

local V2 = {}
V2.__index = V2
local function v2(x, y) return setmetatable({ X = x or 0, Y = y or 0 }, V2) end
V2.__add = function(a, b) return v2(a.X + b.X, a.Y + b.Y) end
V2.__sub = function(a, b) return v2(a.X - b.X, a.Y - b.Y) end
V2.__mul = function(a, b) if type(b) == "number" then return v2(a.X * b, a.Y * b) end return v2(a.X * b.X, a.Y * b.Y) end
V2.__div = function(a, b) if type(b) == "number" then return v2(a.X / b, a.Y / b) end return v2(a.X / b.X, a.Y / b.Y) end
V2.__eq = function(a, b) return a.X == b.X and a.Y == b.Y end
local Vector2 = { new = v2, zero = v2(0, 0), one = v2(1, 1) }

-- Enums: KeyCode values as in Roblox; unknown KeyCode names error (catches typos in the backend)
local KEYCODES = {
    Unknown = 0, Backspace = 8, Tab = 9, Return = 13, Escape = 27, Space = 32, Quote = 39, Comma = 44, Minus = 45, Period = 46, Slash = 47,
    Semicolon = 59, Equals = 61, LeftBracket = 91, BackSlash = 92, RightBracket = 93, Backquote = 96, Delete = 127,
    KeypadPeriod = 266, KeypadDivide = 267, KeypadMultiply = 268, KeypadMinus = 269, KeypadPlus = 270, KeypadEnter = 271, KeypadEquals = 272,
    Up = 273, Down = 274, Right = 275, Left = 276, Insert = 277, Home = 278, End = 279, PageUp = 280, PageDown = 281,
    CapsLock = 301, RightShift = 303, LeftShift = 304, RightControl = 305, LeftControl = 306, RightAlt = 307, LeftAlt = 308,
    LeftSuper = 311, RightSuper = 312,
}
local digits = { "Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine" }
for i = 0, 9 do KEYCODES[digits[i + 1]] = 48 + i; KEYCODES["Keypad" .. digits[i + 1]] = 256 + i end
for i = 0, 25 do KEYCODES[string.char(65 + i)] = 97 + i end
for i = 1, 15 do KEYCODES["F" .. i] = 281 + i end

local Enum = setmetatable({}, { __index = function(t, enum_name)
    local e = setmetatable({}, { __index = function(e, item)
        local value = 0
        if enum_name == "KeyCode" then value = KEYCODES[item]; assert(value, "invalid KeyCode " .. item) end
        local it = { Name = item, Value = value, EnumType = enum_name }
        rawset(e, item, it)
        return it
    end })
    rawset(t, enum_name, e)
    return e
end })

-- Instances
local InstMethods = {}
local InstMT = {}
InstMT.__index = function(t, k)
    if k == "Parent" then return rawget(t, "_parent") end
    local m = InstMethods[k]; if m then return m end
    for _, c in ipairs(rawget(t, "_children")) do if c.Name == k then return c end end
    return nil
end
InstMT.__newindex = function(t, k, v)
    if k == "Parent" then
        local old = rawget(t, "_parent")
        if old then local ch = rawget(old, "_children"); for i, c in ipairs(ch) do if c == t then table.remove(ch, i) break end end end
        rawset(t, "_parent", v)
        if v then table.insert(rawget(v, "_children"), t) end
    else
        rawset(t, k, v)
    end
end
local function newInst(class, name, parent)
    local o = setmetatable({ ClassName = class, Name = name or class, _children = {} }, InstMT)
    if class == "ScreenGui" or class == "Frame" or class == "ImageLabel" then o.AbsoluteSize = v2(SCREEN_W, SCREEN_H) end
    o.Visible = true
    if class == "BindableEvent" then local sig = Signal(); rawset(o, "Event", sig); rawset(o, "Fire", function(_, ...) sig:Fire(...) end) end
    if parent then o.Parent = parent end
    return o
end
function InstMethods:FindFirstChild(name, recursive)
    for _, c in ipairs(rawget(self, "_children")) do if c.Name == name then return c end end
    if recursive then for _, c in ipairs(rawget(self, "_children")) do local r = c:FindFirstChild(name, true); if r then return r end end end
    return nil
end
function InstMethods:WaitForChild(name) return assert(self:FindFirstChild(name), "WaitForChild would hang: " .. name) end
function InstMethods:FindFirstChildOfClass(class) for _, c in ipairs(rawget(self, "_children")) do if c.ClassName == class then return c end end end
function InstMethods:GetChildren() return table.clone(rawget(self, "_children")) end
function InstMethods:IsA(class)
    if class == "GuiObject" then return self.ClassName == "Frame" or self.ClassName == "ImageLabel" end
    return self.ClassName == class
end
function InstMethods:Destroy() self.Parent = nil end

-- Services
local mouse = v2(0, 0)
local keys_down = {}
local UIS = {
    InputBegan = Signal(), InputEnded = Signal(), InputChanged = Signal(), WindowFocused = Signal(), WindowFocusReleased = Signal(),
}
function UIS:GetMouseLocation() return mouse end
function UIS:IsKeyDown(kc) return keys_down[kc] == true end

local RunService = { Heartbeat = Signal(), Stepped = Signal(), PreAnimation = Signal(), RenderStepped = Signal() }
local last_pixels -- last buffer written to an EditableImage
local AssetService = {}
function AssetService:CreateEditableImage(opts)
    local img = { Size = opts.Size, Pixels = buffer.create(opts.Size.X * opts.Size.Y * 4) }
    UPLOADS = 0
    function img:WritePixelsBuffer(origin, size, buf) buffer.copy(img.Pixels, 0, buf); _G_UPLOADS = (_G_UPLOADS or 0) + 1 end
    function img:Destroy() end
    return img
end
local ReplicatedStorage = newInst("ReplicatedStorage")
local PlayerGui = newInst("PlayerGui")
local LocalPlayer = newInst("Player"); PlayerGui.Parent = LocalPlayer
local services = {
    UserInputService = UIS, RunService = RunService, AssetService = AssetService, ReplicatedStorage = ReplicatedStorage,
    Players = { LocalPlayer = LocalPlayer }, HttpService = {}, GuiService = { GetGuiInset = function() return v2(0, 0), v2(0, 0) end },
}
local game = {}
function game:GetService(name) services[name] = services[name] or {}; return services[name] end

local fakeG = {} -- Roblox's shared _G
local cache = {}
local ROBLOX
local function makeEnv(inst) return setmetatable({ script = inst }, { __index = ROBLOX }) end
local GLOBAL_NAMES = { "game", "workspace", "Instance", "Enum", "Vector2", "Vector3", "UDim2", "Color3", "Content", "warn", "require", "script", "os" }
-- Load like Roblox does but WITHOUT setfenv (which would disable Luau optimizations): Roblox globals become chunk locals.
local function loadAsScript(src_name, inst)
    local fn = SOURCE_FNS[src_name]
    local vals = {}
    for i, n in ipairs(GLOBAL_NAMES) do vals[i] = (n == "script") and inst or ROBLOX[n] end
    return function() return fn(table.unpack(vals, 1, #GLOBAL_NAMES)) end
end
local function rbxrequire(inst)
    assert(type(inst) == "table" and inst.ClassName == "ModuleScript", "require() expects a ModuleScript")
    if cache[inst] then return cache[inst].v end
    local r = table.pack(loadAsScript(rawget(inst, "_src"), inst)())
    assert(r.n == 1, "Module code did not return exactly one value")
    cache[inst] = { v = r[1] }
    return r[1]
end

ROBLOX = setmetatable({
    game = game, workspace = { CurrentCamera = { ViewportSize = v2(SCREEN_W, SCREEN_H) } }, require = rbxrequire, _G = fakeG,
    Instance = { new = function(class) return newInst(class) end },
    Enum = Enum, Vector2 = Vector2,
    Vector3 = { new = function(x, y, z) return { X = x, Y = y, Z = z } end },
    UDim2 = { new = function(...) return { ... } end, fromScale = function(...) return { ... } end, fromOffset = function(x, y) return { X = x, Y = y } end },
    Color3 = { new = function(r, g, b) return { R = r or 0, G = g or 0, B = b or 0 } end },
    Content = { fromObject = function(o) return { Object = o } end },
    warn = function(...) print("WARN", ...) end,
    os = { clock = function() return FAKE_TIME end, time = os.time },
}, { __index = realG })

local mod = newInst("ModuleScript", "ImGui", ReplicatedStorage); rawset(mod, "_src", "ImGui.luau")
-- Run main.lua as a LocalScript
local main = loadAsScript("main.client.luau", newInst("LocalScript", "main"))
main()
local G = cache[mod].v
local render_time = 0
local realDemo = G.ImGui.ShowDemoWindow
local realCH = G.ImGui.CollapsingHeader
G.ImGui.CollapsingHeader = function(...)
    if ARG_OPEN then G.ImGui.SetNextItemOpen(true, G.ImGuiCond.Always) end
    return realCH(...)
end
local realTN = G.ImGui.TreeNode
G.ImGui.TreeNode = function(...)
    if ARG_OPEN then G.ImGui.SetNextItemOpen(true, G.ImGuiCond.Always) end
    return realTN(...)
end
G.ImGui.ShowDemoWindow = function(...)
    if ARG_BIG then G.ImGui.SetNextWindowSize(G.ImVec2(900, 1000), G.ImGuiCond.Always) end
    return realDemo(...)
end
local realRender = G.ImGui_ImplRoblox.RenderDrawData
G.ImGui_ImplRoblox.RenderDrawData = function(dd)
    if FORCE then G.ImGui.GetIO().BackendPlatformUserData.ForceRedraw = true end
    local t0 = os.clock(); realRender(dd); render_time = render_time + os.clock() - t0
end

-- Drive frames with scripted (deterministic) input
local seed = 12345
local function rnd(n) seed = (seed * 1103515245 + 12345) % 2147483648; return seed % n end
local function input(t, kc, pos) return { UserInputType = Enum.UserInputType[t], KeyCode = Enum.KeyCode[kc or "Unknown"], Position = pos or { X = 0, Y = 0, Z = 0 } } end
local held = false
local typing = { "H", "E", "L", "L", "O", "Space", "One", "Two", "Minus", "Backspace", "Left", "Return" }
local hex = {}
for i = 0, 255 do hex[i] = string.format("%02x", i) end

local total = 0
for frame = 1, NFRAMES do
    local r = rnd(100)
    if r < 40 then
        mouse = v2(math.clamp(mouse.X + rnd(81) - 40, 0, SCREEN_W - 1), math.clamp(mouse.Y + rnd(81) - 40, 0, SCREEN_H - 1))
    elseif r < 55 then
        held = not held
        if held then UIS.InputBegan:Fire(input("MouseButton1"), false) else UIS.InputEnded:Fire(input("MouseButton1"), false) end
    elseif r < 60 then
        UIS.InputChanged:Fire(input("MouseWheel", nil, { X = 0, Y = 0, Z = rnd(3) - 1 }), false)
    elseif r < 75 then
        local k = typing[rnd(#typing) + 1]
        local shift = rnd(4) == 0
        if shift then keys_down[Enum.KeyCode.LeftShift] = true; UIS.InputBegan:Fire(input("Keyboard", "LeftShift"), false) end
        UIS.InputBegan:Fire(input("Keyboard", k), false)
        UIS.InputEnded:Fire(input("Keyboard", k), false)
        if shift then keys_down[Enum.KeyCode.LeftShift] = nil; UIS.InputEnded:Fire(input("Keyboard", "LeftShift"), false) end
    elseif r < 90 then
        mouse = v2(rnd(700), rnd(500))
    end

    FAKE_TIME = frame / 60
    local t0 = os.clock()
    RunService.Stepped:Fire(frame / 60, 1 / 60)
    local dt = os.clock() - t0
    if frame > 10 then total = total + dt end

    if frame == 10 then render_time = 0; _G_UPLOADS = 0 end
    if DUMP_FRAMES[frame] and ARG_DUMP then
        local W, H = SCREEN_W, SCREEN_H
        local screen = buffer.create(W * H * 4)
        local gui = PlayerGui:FindFirstChild("ImGui")
        for _, label in ipairs(gui:GetChildren()) do
            if label.Visible then
                local img, px, py = label.ImageContent.Object, label.Position.X, label.Position.Y
                local tw, th = img.Size.X, img.Size.Y
                for y = 0, th - 1 do
                    if py + y < H then
                        local n = math.min(tw, W - px)
                        buffer.copy(screen, ((py + y) * W + px) * 4, img.Pixels, y * tw * 4, n * 4)
                    end
                end
            end
        end
        local parts = {}
        for i = 0, W * H * 4 - 1 do parts[#parts + 1] = hex[buffer.readu8(screen, i)] end
        print(string.format("IMG %d %d %d %s", frame, W, H, table.concat(parts)))
    end
end
print(string.format("avg frame total %.2f ms, of which render %.2f ms, uploads/frame %.2f", total / (NFRAMES - 10) * 1000, render_time / (NFRAMES - 10) * 1000, _G_UPLOADS / (NFRAMES - 10)))