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

tools/test/love/mock_love.lua

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+-- Minimal headless `love` for running build/imgui_love.lua under plain LuaJIT (tools/test/love/run.sh).
+local ffi = require("ffi")
+local W, H = 1920, 1080
+local t = 0
+local function obj(extra) local o = { release = function() end }; for k, v in pairs(extra or {}) do o[k] = v end; return o end
+local function bytedata(n)
+    local mem = ffi.new("uint8_t[?]", n)
+    return obj({ getFFIPointer = function() return mem end, getSize = function() return n end })
+end
+love = {
+    timer = { getTime = function() return t end, step = function(dt) t = t + dt end },
+    graphics = {
+        getDimensions = function() return W, H end,
+        newImage = function() return obj({ setFilter = function() end, replacePixels = function() end }) end,
+        newMesh = function() return obj({ setVertices = function() end, setVertexMap = function() end, setTexture = function() end, setDrawRange = function() end }) end,
+        push = function() end, pop = function() end, setBlendMode = function() end, setColor = function() end,
+        translate = function() end, setScissor = function() end, draw = function() MOCK_DRAWS = (MOCK_DRAWS or 0) + 1 end,
+    },
+    image = { newImageData = function(w, h) return bytedata(w * h * 4) end },
+    data = { newByteData = function(n) return bytedata(n) end },
+    keyboard = { isDown = function() return false end, setTextInput = function() end, setKeyRepeat = function() end },
+    mouse = { setCursor = function() end, getSystemCursor = function() return {} end, setVisible = function() end },
+    system = { getClipboardText = function() return "" end, setClipboardText = function() end, openURL = function() end },
+    filesystem = { getInfo = function() return nil end, read = function() return nil end },
+}

tools/test/love/run.sh

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+#!/bin/sh
+# LÖVE/LuaJIT checks: build the love bundle, compare draw checksums with the Luau ones, run both LÖVE examples headless.
+set -e
+cd "$(dirname "$0")/../../.."
+python3 tools/bundle.py --target love >/dev/null
+nix-shell -p luajit --run "luajit tools/test/love/t_drawhash.lua 150 Widgets,Basic && luajit tools/test/love/t_drawhash.lua 150 all && luajit tools/test/love/t_examples.lua"
+echo "expected (Luau, tools/test/scripts/t_drawhash.luau): 1385106188 / 1292122782"

tools/test/love/t_drawhash.lua

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+-- LuaJIT twin of tools/test/scripts/t_drawhash.luau: same input, same checksum => compat shims behave like Luau.
+-- usage: luajit tools/test/love/t_drawhash.lua <frames> [Widgets,Basic | all]
+dofile("tools/test/love/mock_love.lua")
+local G = dofile("build/imgui_love.lua")
+local ImGui = G.ImGui
+local FRAMES, OPEN = tonumber(arg[1] or 150), arg[2] or ""
+local open = {}
+for n in OPEN:gmatch("[^,]+") do open[n] = true end
+for _, fname in ipairs({ "TreeNode", "CollapsingHeader" }) do
+    local real = ImGui[fname]
+    ImGui[fname] = function(label, ...)
+        if open[label] or OPEN == "all" then ImGui.SetNextItemOpen(true, G.ImGuiCond.Always) end
+        return real(label, ...)
+    end
+end
+ImGui.CreateContext()
+G.ImGui_ImplLove.Init({ root = "./" })
+local io = ImGui.GetIO()
+local h = 0
+local function mix(v) h = (h * 31 + math.floor(v * 64 + 0.5)) % 2147483647 end
+for frame = 1, FRAMES do
+    love.timer.step(1 / 60)
+    G.ImGui_ImplLove.NewFrame()
+    io.DeltaTime = 1 / 60
+    if frame == 1 then io:AddMousePosEvent(0, 0) end -- (the Roblox backend reports the initial mouse position)
+    io:AddMousePosEvent(100 + (frame * 37) % 500, 60 + (frame * 53) % 600)
+    if frame % 7 == 0 then io:AddMouseButtonEvent(0, frame % 14 == 0) end
+    if frame % 11 == 0 then io:AddMouseWheelEvent(0, -1) end
+    ImGui.NewFrame()
+    ImGui.ShowDemoWindow(true)
+    ImGui.Render()
+    for _, dl in ImGui.GetDrawData().CmdLists:iter() do
+        local vb, id = dl.VtxBuffer.Buf, dl.IdxBuffer.Data
+        for i = 1, dl.VtxBuffer.Size do local o = (i - 1) * 36; mix(buffer.readf64(vb, o)); mix(buffer.readf64(vb, o + 8)); mix(buffer.readf64(vb, o + 16) * 4096); mix(buffer.readf64(vb, o + 24) * 4096); mix(buffer.readu32(vb, o + 32) / 64) end
+        for i = 1, dl.IdxBuffer.Size do mix(id[i]) end
+        for _, c in dl.CmdBuffer:iter() do mix(c.ClipRect.x); mix(c.ClipRect.y); mix(c.ClipRect.z); mix(c.ClipRect.w); mix(c.ElemCount) end
+    end
+    G.ImGui_ImplLove.RenderDrawData(ImGui.GetDrawData())
+    if frame == FRAMES - 1 then print("DRAWHASH", string.format("%d", h)) end
+end
+print("draws", MOCK_DRAWS)

tools/test/love/t_examples.lua

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+-- Runs examples/example_love and examples/example_shared main.lua headless under LuaJIT (mock love) for some frames.
+for _, ex in ipairs({ "examples/example_love", "examples/example_shared" }) do
+    dofile("tools/test/love/mock_love.lua")
+    love.filesystem.getSource = function() return ex end
+    love.filesystem.load = function(p) return assert(loadfile(ex .. "/" .. p)) end
+    love.graphics.clear = function() end
+    dofile(ex .. "/main.lua")
+    love.load()
+    for i = 1, 30 do
+        love.timer.step(1 / 60)
+        love.mousemoved(100 + i, 100); love.update(1 / 60); love.draw()
+    end
+    love.keypressed("a"); love.textinput("a"); love.keyreleased("a"); love.update(1 / 60); love.draw()
+    print(ex, "OK", MOCK_DRAWS)
+end