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roblox backend: render scale for high-DPI displays; make tiles Active while imgui wants the mouse so input doesn't reach the game

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4DBug
2026-10-08 08:21:54 -05:00
parent d7a2b8a4df
commit 4719eeedf3
4 changed files with 62 additions and 14 deletions
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imgui/backend/imgui_impl_roblox.lua
+28 -6
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@@ -465,11 +465,13 @@ local function GetTile(bd, index, tx, ty)
label.Name = "Tile" .. index
label.BackgroundTransparency = 1
label.BorderSizePixel = 0
label.Size = UDim2.fromOffset(TILE, TILE)
label.Position = UDim2.fromOffset(tx * TILE, ty * TILE)
local scale = bd.Scale
label.Size = UDim2.fromOffset(TILE / scale, TILE / scale)
label.Position = UDim2.fromOffset(tx * TILE / scale, ty * TILE / scale)
label.ResampleMode = Enum.ResamplerMode.Pixelated
label.ImageContent = Content.fromObject(img)
label.Visible = false
label.Active = bd.TilesActive
label.Parent = bd.Gui
tile = { Image = img, Label = label, Buffer = buffer.create(TILE * TILE * 4), H1 = -1, H2 = -1, Visible = false }
bd.Tiles[index] = tile
@@ -642,7 +644,10 @@ end
---------------------------------------------------------
--- @param parent Instance? # where the ScreenGui goes, defaults to the local player's PlayerGui
function ImGui_ImplRoblox_Init(parent)
--- @param render_scale number? # imgui pixels per Roblox UI point (defaults to 1). Roblox UI points are scaled by the
--- # OS display scale, so on a 150% display pass 1.5 to render at physical resolution
--- # (imgui then looks the same size as a desktop imgui app). Change later with SetRenderScale().
function ImGui_ImplRoblox_Init(parent, render_scale)
local io = ImGui.GetIO()
local gui = Instance.new("ScreenGui")
@@ -655,7 +660,7 @@ function ImGui_ImplRoblox_Init(parent)
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,
Tiles = {}, TileCols = 0, TileRows = 0, Scale = render_scale or 1, TilesActive = false, TH1 = {}, TH2 = {}, TN = {}, TL = {}, LastPrimCount = 0, ForceRedraw = true,
}
io.BackendPlatformUserData = bd
@@ -732,7 +737,7 @@ function ImGui_ImplRoblox_NewFrame()
local bd = ImGui_ImplRoblox_GetBackendData()
local screen = bd.Gui.AbsoluteSize
local w, h = floor(screen.X), floor(screen.Y)
local w, h = floor(screen.X * bd.Scale), floor(screen.Y * bd.Scale)
if w ~= bd.ScreenW or h ~= bd.ScreenH then
bd.ScreenW, bd.ScreenH = w, h
ImGui_ImplRoblox_UpdateMonitors(w, h)
@@ -747,8 +752,24 @@ function ImGui_ImplRoblox_NewFrame()
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)
io:AddMousePosEvent(m.X * bd.Scale, m.Y * bd.Scale)
end
-- While the mouse is over imgui, make the tiles Active so Roblox stops passing clicks/wheel to the game (camera zoom etc.)
local want = io.WantCaptureMouse
if want ~= bd.TilesActive then
bd.TilesActive = want
for _, tile in pairs(bd.Tiles) do tile.Label.Active = want end
end
end
function ImGui_ImplRoblox_SetRenderScale(scale)
local bd = ImGui_ImplRoblox_GetBackendData()
if scale == bd.Scale then return end
bd.Scale = scale
DestroyTiles(bd)
bd.TileCols, bd.TileRows = 0, 0
bd.ForceRedraw = true
end
ImGui_ImplRoblox = {
@@ -757,6 +778,7 @@ ImGui_ImplRoblox = {
NewFrame = ImGui_ImplRoblox_NewFrame,
RenderDrawData = ImGui_ImplRoblox_RenderDrawData,
AddFile = ImGui_ImplRoblox_AddFile,
SetRenderScale = ImGui_ImplRoblox_SetRenderScale,
}
return true -- [Roblox] ModuleScripts must return exactly one value