LÖVE backend + build target (compat/luajit.lua shims, Roblox build unchanged), examples/example_love, examples/example_shared (same app on Roblox and LÖVE), LuaJIT checksum tests
This commit is contained in:
4DBug
@@ -0,0 +1,397 @@
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--- Dear ImGui backend for LÖVE (11.x, LuaJIT). Platform (input, clipboard, cursors, IME) + renderer (Mesh per draw list).
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--- Built into build/imgui_love.lua by `python3 tools/bundle.py --target love`.
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--- Usage (see examples/example_love/main.lua):
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--- love.load: ImGui.CreateContext(); ImGui_ImplLove.Init({ root = "<repo root>/" })
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--- love.update: ImGui_ImplLove.NewFrame(); ImGui.NewFrame(); ...your UI...; ImGui.Render()
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--- love.draw: ImGui_ImplLove.RenderDrawData(ImGui.GetDrawData())
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--- forward love.mousemoved/mousepressed/mousereleased/wheelmoved/keypressed/keyreleased/textinput to ImGui_ImplLove.*
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local ffi = require("ffi")
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local floor, min = math.floor, math.min
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local ImGui_ImplLOVE_GetBackendData
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local CURSOR_MAP = {
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[ImGuiMouseCursor.Arrow] = "arrow",
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[ImGuiMouseCursor.TextInput] = "ibeam",
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[ImGuiMouseCursor.ResizeAll] = "sizeall",
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[ImGuiMouseCursor.ResizeNS] = "sizens",
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[ImGuiMouseCursor.ResizeEW] = "sizewe",
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[ImGuiMouseCursor.ResizeNESW] = "sizenesw",
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[ImGuiMouseCursor.ResizeNWSE] = "sizenwse",
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[ImGuiMouseCursor.Hand] = "hand",
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[ImGuiMouseCursor.Wait] = "wait",
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[ImGuiMouseCursor.Progress] = "waitarrow",
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[ImGuiMouseCursor.NotAllowed] = "no",
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}
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local KEY_MAP = {
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["return"] = ImGuiKey.Enter, ["escape"] = ImGuiKey.Escape,
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["backspace"] = ImGuiKey.Backspace, ["tab"] = ImGuiKey.Tab,
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["space"] = ImGuiKey.Space, ["kpenter"] = ImGuiKey.KeypadEnter,
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["up"] = ImGuiKey.UpArrow, ["down"] = ImGuiKey.DownArrow,
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["left"] = ImGuiKey.LeftArrow, ["right"] = ImGuiKey.RightArrow,
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["home"] = ImGuiKey.Home, ["end"] = ImGuiKey.End,
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["pageup"] = ImGuiKey.PageUp, ["pagedown"] = ImGuiKey.PageDown,
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["insert"] = ImGuiKey.Insert, ["delete"] = ImGuiKey.Delete,
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["lctrl"] = ImGuiKey.LeftCtrl, ["rctrl"] = ImGuiKey.RightCtrl,
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["lshift"] = ImGuiKey.LeftShift, ["rshift"] = ImGuiKey.RightShift,
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["lalt"] = ImGuiKey.LeftAlt, ["ralt"] = ImGuiKey.RightAlt,
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["lgui"] = ImGuiKey.LeftSuper, ["rgui"] = ImGuiKey.RightSuper,
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["-"] = ImGuiKey.Minus, ["="] = ImGuiKey.Equal, ["["] = ImGuiKey.LeftBracket, ["]"] = ImGuiKey.RightBracket,
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[";"] = ImGuiKey.Semicolon, ["'"] = ImGuiKey.Apostrophe, [","] = ImGuiKey.Comma, ["."] = ImGuiKey.Period,
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["/"] = ImGuiKey.Slash, ["\\"] = ImGuiKey.Backslash, ["`"] = ImGuiKey.GraveAccent,
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}
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for i = 0, 9 do KEY_MAP[tostring(i)] = ImGuiKey["K" .. i]; KEY_MAP["kp" .. i] = ImGuiKey["Keypad" .. i] end
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for i = 1, 12 do KEY_MAP["f" .. i] = ImGuiKey["F" .. i] end
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for c in ("abcdefghijklmnopqrstuvwxyz"):gmatch(".") do KEY_MAP[c] = ImGuiKey[c:upper()] end
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local function UpdateKeyModifiers()
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local io = ImGui.GetIO()
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io:AddKeyEvent(ImGuiMod_Ctrl, love.keyboard.isDown("lctrl", "rctrl"))
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io:AddKeyEvent(ImGuiMod_Shift, love.keyboard.isDown("lshift", "rshift"))
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io:AddKeyEvent(ImGuiMod_Alt, love.keyboard.isDown("lalt", "ralt"))
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io:AddKeyEvent(ImGuiMod_Super, love.keyboard.isDown("lgui", "rgui"))
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end
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function ImGui_ImplLOVE_GetBackendData()
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return ImGui.GetCurrentContext() and ImGui.GetIO().BackendPlatformUserData or nil
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end
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local function UpdateMonitors(w, h)
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local platform_io = ImGui.GetPlatformIO()
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platform_io.Monitors:resize(0)
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local m = ImGuiPlatformMonitor()
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ImVec2_Copy(m.MainSize, ImVec2(w, h))
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ImVec2_Copy(m.WorkSize, ImVec2(w, h))
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platform_io.Monitors:push_back(m)
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end
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---------------------------------------------------------
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-- PLATFORM DATA & CALLBACKS
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---------------------------------------------------------
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local function PlatformSetImeData(ctx, vp, data)
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if data.WantVisible or data.WantTextInput then
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love.keyboard.setTextInput(true, data.InputPos.x, data.InputPos.y, 1, data.InputLineHeight)
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else
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love.keyboard.setTextInput(false)
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end
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end
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local function PlatformSetClipboardText(ctx, text) love.system.setClipboardText(text) end
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local function PlatformGetClipboardText(ctx) return love.system.getClipboardText() end
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local function PlatformOpenInShell(ctx, path) return love.system.openURL(path) end
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---------------------------------------------------------
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-- FILE SYSTEM: love.filesystem (game folder), then io.open(<root> .. path) so fonts/ etc. load from the repo
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---------------------------------------------------------
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local function ReadFile(filename)
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local data = love.filesystem.getInfo(filename) and love.filesystem.read(filename)
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if data then return data end
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local bd = ImGui_ImplLOVE_GetBackendData()
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local f = io.open(((bd and bd.Root) or "") .. filename, "rb")
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if not f then return nil end
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data = f:read("*a"); f:close()
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return data
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end
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function ImStd.ImFileOpen(filename, mode)
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local data = ReadFile(filename)
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return data and { Data = data, Pos = 0 } or nil
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end
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function ImStd.ImFileClose(f) end
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function ImStd.ImFileGetSize(f) return #f.Data end
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function ImStd.ImFileRead(f, data, count)
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local s, pos = f.Data, f.Pos
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count = min(count, #s - pos)
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for i = 1, count do data[i] = string.byte(s, pos + i) end
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f.Pos = pos + count
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return count
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end
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function ImStd.ImFileLoadToMemory(filename, mode)
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local f = ImStd.ImFileOpen(filename, mode)
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if not f or #f.Data == 0 then return end
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local file_data = {}
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local size = ImStd.ImFileRead(f, file_data, #f.Data)
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return file_data, size
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end
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---------------------------------------------------------
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-- TEXTURES
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---------------------------------------------------------
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local function CopyToImageData(tex, x, y, w, h)
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local img = love.image.newImageData(w, h, "rgba8")
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local dst = ffi.cast("uint8_t*", img:getFFIPointer())
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local bpp = tex.BytesPerPixel
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for row = 0, h - 1 do
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local src, base = tex:GetPixelsAt(x, y + row)
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local d = row * w * 4
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if bpp == 4 then
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for i = 0, w * 4 - 1 do dst[d + i] = src[base + i] end
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else -- Alpha8: white with alpha
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for i = 0, w - 1 do
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local o = d + i * 4
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dst[o], dst[o + 1], dst[o + 2], dst[o + 3] = 255, 255, 255, src[base + i]
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end
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end
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end
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return img
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end
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function ImGui_ImplLOVE_UpdateTexture(tex)
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local bd = ImGui_ImplLOVE_GetBackendData()
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if tex.Status == ImTextureStatus.WantCreate then
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local data = CopyToImageData(tex, 0, 0, tex.Width, tex.Height)
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local image = love.graphics.newImage(data)
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image:setFilter("nearest", "nearest")
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bd.TextureCount = bd.TextureCount + 1
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bd.Textures[bd.TextureCount] = image
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tex.BackendUserData = bd.TextureCount
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tex:SetTexID(bd.TextureCount)
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tex:SetStatus(ImTextureStatus.OK)
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elseif tex.Status == ImTextureStatus.WantUpdates then
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local image = bd.Textures[tex.BackendUserData]
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for _, r in tex.Updates:iter() do
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local data = CopyToImageData(tex, r.x, r.y, r.w, r.h)
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image:replacePixels(data, nil, 1, r.x, r.y, false)
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data:release()
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end
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tex:SetStatus(ImTextureStatus.OK)
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elseif tex.Status == ImTextureStatus.WantDestroy then
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local image = tex.BackendUserData and bd.Textures[tex.BackendUserData]
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if image then image:release(); bd.Textures[tex.BackendUserData] = nil end
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tex.BackendUserData = nil
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tex:SetTexID(ImTextureID_Invalid)
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tex:SetStatus(ImTextureStatus.Destroyed)
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end
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end
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--- User texture from RGBA8 pixels (a `buffer` of w*h*4 bytes, or a love ImageData). Returns an ImTextureRef.
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function ImGui_ImplLOVE_CreateTexture(pixels, w, h)
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local bd = ImGui_ImplLOVE_GetBackendData()
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local data = pixels
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if type(pixels) == "table" and pixels.p then
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data = love.image.newImageData(w, h, "rgba8")
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ffi.copy(data:getFFIPointer(), pixels.p, w * h * 4)
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end
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bd.TextureCount = bd.TextureCount + 1
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bd.Textures[bd.TextureCount] = love.graphics.newImage(data)
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return ImTextureRef(bd.TextureCount)
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end
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function ImGui_ImplLOVE_DestroyTexture(tex_ref)
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local bd = ImGui_ImplLOVE_GetBackendData()
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local image = bd.Textures[tex_ref._TexID]
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if image then image:release(); bd.Textures[tex_ref._TexID] = nil end
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end
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---------------------------------------------------------
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-- RENDERING: one streamed Mesh per draw list; vertices converted from the port's flat VtxBuffer (f64 x, y, u, v,
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-- u32 col; 36 bytes) to LÖVE's float x, y, u, v + byte rgba (20 bytes); indices -> 0-based uint32 vertex map.
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---------------------------------------------------------
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ffi.cdef("typedef struct { float x, y, u, v; uint8_t r, g, b, a; } ImGuiLoveVertex;")
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local VERTEX_FORMAT = { { "VertexPosition", "float", 2 }, { "VertexTexCoord", "float", 2 }, { "VertexColor", "byte", 4 } }
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local vtx_ct, u32p, f64p = ffi.typeof("ImGuiLoveVertex*"), ffi.typeof("uint32_t*"), ffi.typeof("double*")
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local function GetMesh(bd, draw_list, nvtx, nidx)
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local m = bd.Meshes[draw_list]
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if not m or m.VtxCap < nvtx or m.IdxCap < nidx then
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local vcap = math.max(nvtx, m and m.VtxCap * 2 or 256)
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local icap = math.max(nidx, m and m.IdxCap * 2 or 512)
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if m then m.Mesh:release() end
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m = {
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Mesh = love.graphics.newMesh(VERTEX_FORMAT, vcap, "triangles", "stream"),
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VtxData = love.data.newByteData(vcap * 20), IdxData = love.data.newByteData(icap * 4),
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VtxCap = vcap, IdxCap = icap,
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}
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bd.Meshes[draw_list] = m
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end
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m.Used = bd.FrameNo
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return m
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end
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function ImGui_ImplLOVE_RenderDrawData(draw_data)
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local bd = ImGui_ImplLOVE_GetBackendData()
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if draw_data.Textures ~= nil then
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for _, tex in draw_data.Textures:iter() do
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if tex.Status ~= ImTextureStatus.OK then ImGui_ImplLOVE_UpdateTexture(tex) end
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end
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end
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local fb_w, fb_h = draw_data.DisplaySize.x, draw_data.DisplaySize.y
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if fb_w <= 0 or fb_h <= 0 then return end
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bd.FrameNo = bd.FrameNo + 1
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love.graphics.push("all")
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love.graphics.setBlendMode("alpha", "alphamultiply")
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love.graphics.setColor(1, 1, 1, 1)
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local ox, oy = draw_data.DisplayPos.x, draw_data.DisplayPos.y
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love.graphics.translate(-ox, -oy)
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for _, draw_list in draw_data.CmdLists:iter() do
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local nvtx, nidx = draw_list.VtxBuffer.Size, draw_list.IdxBuffer.Size
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if nvtx > 0 and nidx > 0 then
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local m = GetMesh(bd, draw_list, nvtx, nidx)
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local base = draw_list.VtxBuffer.Buf.p
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local srcu = ffi.cast(u32p, base)
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local dst = ffi.cast(vtx_ct, m.VtxData:getFFIPointer())
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for i = 0, nvtx - 1 do
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local v, src = dst[i], ffi.cast(f64p, base + i * 36) -- 36-byte stride: cast per vertex
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v.x, v.y, v.u, v.v = src[0], src[1], src[2], src[3]
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local c = srcu[i * 9 + 8]
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v.r, v.g, v.b, v.a = c % 256, floor(c / 256) % 256, floor(c / 65536) % 256, floor(c / 16777216)
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end
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m.Mesh:setVertices(m.VtxData, 1, nvtx)
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-- vertex map: per command, 0-based vertex = VtxOffset + idx - 1 (port indices are 1-based)
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local map = ffi.cast(u32p, m.IdxData:getFFIPointer())
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local idx = draw_list.IdxBuffer.Data
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for _, pcmd in draw_list.CmdBuffer:iter() do
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local vo = pcmd.VtxOffset
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for i = pcmd.IdxOffset + 1, pcmd.IdxOffset + pcmd.ElemCount do map[i - 1] = vo + idx[i] - 1 end
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end
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m.Mesh:setVertexMap(m.IdxData, "uint32")
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for _, pcmd in draw_list.CmdBuffer:iter() do
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if pcmd.UserCallback ~= nil then
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pcmd.UserCallback(draw_list, pcmd)
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elseif pcmd.ElemCount > 0 then
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local c = pcmd.ClipRect
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local x0, y0 = math.max(c.x - ox, 0), math.max(c.y - oy, 0)
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local x1, y1 = min(c.z - ox, fb_w), min(c.w - oy, fb_h)
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if x1 > x0 and y1 > y0 then
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love.graphics.setScissor(x0, y0, x1 - x0, y1 - y0)
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m.Mesh:setTexture(bd.Textures[pcmd:GetTexID()])
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m.Mesh:setDrawRange(pcmd.IdxOffset + 1, pcmd.ElemCount)
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love.graphics.draw(m.Mesh)
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end
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end
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end
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end
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end
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-- free meshes of draw lists that went away
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for dl, m in pairs(bd.Meshes) do
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if bd.FrameNo - m.Used > 120 then m.Mesh:release(); bd.Meshes[dl] = nil end
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end
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love.graphics.setScissor()
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love.graphics.pop()
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end
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---------------------------------------------------------
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-- LIFECYCLE
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---------------------------------------------------------
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--- opts.root: path prefix for files not in the LÖVE game folder (e.g. the repo root, for fonts/)
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function ImGui_ImplLOVE_Init(opts)
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opts = opts or {}
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local io = ImGui.GetIO()
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local bd = { Time = love.timer.getTime(), Root = opts.root or "", Textures = {}, TextureCount = 0, Meshes = {}, FrameNo = 0 }
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io.BackendPlatformUserData = bd
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io.BackendFlags = bit32.bor(io.BackendFlags, ImGuiBackendFlags.RendererHasTextures, ImGuiBackendFlags.RendererHasVtxOffset, ImGuiBackendFlags.HasMouseCursors)
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local platform_io = ImGui.GetPlatformIO()
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platform_io.Platform_SetImeDataFn = PlatformSetImeData
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platform_io.Platform_SetClipboardTextFn = PlatformSetClipboardText
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platform_io.Platform_GetClipboardTextFn = PlatformGetClipboardText
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platform_io.Platform_OpenInShellFn = PlatformOpenInShell
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local w, h = love.graphics.getDimensions()
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UpdateMonitors(w, h)
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love.keyboard.setKeyRepeat(true)
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end
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function ImGui_ImplLOVE_Shutdown()
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local io = ImGui.GetIO()
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local bd = ImGui_ImplLOVE_GetBackendData()
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for _, m in pairs(bd.Meshes) do m.Mesh:release() end
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for _, t in pairs(bd.Textures) do t:release() end
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io.BackendPlatformUserData = nil
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io.BackendFlags = bit32.band(io.BackendFlags, bit32.bnot(bit32.bor(ImGuiBackendFlags.RendererHasTextures, ImGuiBackendFlags.RendererHasVtxOffset, ImGuiBackendFlags.HasMouseCursors)))
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end
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function ImGui_ImplLOVE_NewFrame()
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local io = ImGui.GetIO()
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local bd = ImGui_ImplLOVE_GetBackendData()
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local w, h = love.graphics.getDimensions()
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if w ~= bd.ScreenW or h ~= bd.ScreenH then bd.ScreenW, bd.ScreenH = w, h; UpdateMonitors(w, h) end
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ImVec2_CopyV(io.DisplaySize, w, h)
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local now = love.timer.getTime()
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io.DeltaTime = (now > bd.Time) and (now - bd.Time) or (1.0 / 60.0)
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bd.Time = now
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if bit32.band(io.ConfigFlags, ImGuiConfigFlags.NoMouseCursorChange) == 0 then
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local cursor = ImGui.GetMouseCursor()
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if cursor ~= bd.LastCursor then
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bd.LastCursor = cursor
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local name = CURSOR_MAP[cursor]
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love.mouse.setVisible(cursor ~= ImGuiMouseCursor.None and not io.MouseDrawCursor)
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love.mouse.setCursor(name and love.mouse.getSystemCursor(name) or nil)
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end
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end
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end
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---------------------------------------------------------
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-- LÖVE EVENT HOOKS (forward from love.* callbacks)
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---------------------------------------------------------
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local MOUSE_BUTTONS = { [1] = 0, [2] = 1, [3] = 2, [4] = 3, [5] = 4 } -- LÖVE: 1 left, 2 right, 3 middle
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local function MouseMoved(x, y)
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local io = ImGui.GetIO()
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io:AddMouseSourceEvent(ImGuiMouseSource.Mouse)
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io:AddMousePosEvent(x, y)
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end
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local function MousePressed(x, y, button)
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local b = MOUSE_BUTTONS[button]
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if b then local io = ImGui.GetIO(); io:AddMouseSourceEvent(ImGuiMouseSource.Mouse); io:AddMouseButtonEvent(b, true) end
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end
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local function MouseReleased(x, y, button)
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local b = MOUSE_BUTTONS[button]
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if b then ImGui.GetIO():AddMouseButtonEvent(b, false) end
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end
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local function WheelMoved(x, y) ImGui.GetIO():AddMouseWheelEvent(-x, y) end
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local function KeyPressed(key)
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UpdateKeyModifiers()
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local k = KEY_MAP[key]
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if k then ImGui.GetIO():AddKeyEvent(k, true) end
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end
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local function KeyReleased(key)
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UpdateKeyModifiers()
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local k = KEY_MAP[key]
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if k then ImGui.GetIO():AddKeyEvent(k, false) end
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end
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local function TextInput(text)
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local io = ImGui.GetIO()
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for _, c in utf8.codes(text) do io:AddInputCharacter(c) end
|
||||
end
|
||||
local function Focus(f) ImGui.GetIO():AddFocusEvent(f) end
|
||||
|
||||
--- True when ImGui wants the mouse / keyboard (don't pass the event to your game)
|
||||
local function WantCaptureMouse() return ImGui.GetIO().WantCaptureMouse end
|
||||
local function WantCaptureKeyboard() return ImGui.GetIO().WantCaptureKeyboard end
|
||||
|
||||
ImGui_ImplLove = {
|
||||
Init = ImGui_ImplLOVE_Init,
|
||||
Shutdown = ImGui_ImplLOVE_Shutdown,
|
||||
NewFrame = ImGui_ImplLOVE_NewFrame,
|
||||
RenderDrawData = ImGui_ImplLOVE_RenderDrawData,
|
||||
CreateTexture = ImGui_ImplLOVE_CreateTexture,
|
||||
DestroyTexture = ImGui_ImplLOVE_DestroyTexture,
|
||||
MouseMoved = MouseMoved,
|
||||
MousePressed = MousePressed,
|
||||
MouseReleased = MouseReleased,
|
||||
WheelMoved = WheelMoved,
|
||||
KeyPressed = KeyPressed,
|
||||
KeyReleased = KeyReleased,
|
||||
TextInput = TextInput,
|
||||
Focus = Focus,
|
||||
WantCaptureMouse = WantCaptureMouse,
|
||||
WantCaptureKeyboard = WantCaptureKeyboard,
|
||||
}
|
||||
|
||||
return true
|
||||
Reference in New Issue
Block a user