Lua Editor Part 2

[Pursche]

Moves Hierarchy, Inspector and AssetBrowser to Luau editors with the CanvasRenderer, gets rid of their C++/ImGui counterparts. Also cleans up old C++/ImGui based MapSelector.

[Copilot]

Pull request overview

Ports multiple editor UI tools from C++/ImGui to Luau-driven widgets rendered via CanvasRenderer, and introduces supporting engine-side APIs for GPU-composed UI transforms, clipping/masking, and new Lua-facing handler tables (Map/Camera/Time/Editor/Scene/Asset).

Changes:

• Replace ImGui-based editor windows (Map selector, Hierarchy, Camera Info, etc.) with Luau implementations and register them in the dev top bar.
• Add GPU-side UI transform chaining + indexed clip/mask buffers (shader + renderer + ECS/UI plumbing) to reduce CPU propagation work.
• Introduce new Lua handlers (Map/Time/Camera/Editor/Scene/Asset) and update scripts to use the new APIs.

Reviewed changes

Copilot reviewed 83 out of 83 changed files in this pull request and generated 8 comments.

Show a summary per file

File	Description
Source/Shaders/Shaders/UI/Widget.vs.slang	Adds GPU parent-chain matrix composition for 2D widgets.
Source/Shaders/Shaders/UI/Widget.ps.slang	Switches clipping/masking to indexed clip-rect + mask-info buffers.
Source/Resources/Scripts/UI/Chat.luau	Adjusts InputBox anchoring usage.
Source/Resources/Scripts/Types.def	Replaces global map functions with a typed Map API surface.
Source/Resources/Scripts/Editor/MapEditor.luau	New Luau Map editor window (list/filter/actions + context menu).
Source/Resources/Scripts/Editor/Hierarchy.luau	New Luau Hierarchy window using VirtualList + shared selection module.
Source/Resources/Scripts/Editor/DevTopBar.luau	Adds menu entries to toggle new Luau editor windows.
Source/Resources/Scripts/Editor/CameraEditor.luau	New Luau Camera Info window (sections + saves list + context menu).
Source/Resources/Scripts/API/UI/VirtualList.luau	New virtualized fixed-row list built on ScrollBox.
Source/Resources/Scripts/API/UI/ScrollBox.luau	Adds SetOnScroll and scrollbar-drag scrolling callbacks for virtualization.
Source/Resources/Scripts/API/UI/LoadingScreen.luau	Updates map-loading progress call site to Map.GetLoadingProgress().
Source/Resources/Scripts/API/UI/InputBox.luau	Adds SetOnTextChanged + fires change events on edits; refactors widget structure.
Source/Resources/Scripts/API/UI/EditorSelection.luau	New Lua fan-out selection helper bridging to dev-only Editor handler callbacks.
Source/Resources/Scripts/API/UI/DragInput.luau	New numeric drag-scrub input built atop InputBox.
Source/Resources/Scripts/API/UI/ContextMenu.luau	New right-click context menu widget with click-outside shield.
Source/Resources/Scripts/API/UI/Collapsible.luau	New collapsible section widget for editor window layouts.
Source/Resources/Scripts/API/UI/ActionBar.luau	Adjusts spell icon handling (currently disables icons).
Source/Game-Lib/Game-Lib/Util/PhysicsUtil.h	Declares CastRayWorld helper.
Source/Game-Lib/Game-Lib/Util/PhysicsUtil.cpp	Implements CastRayWorld using Jolt NarrowPhaseQuery + optional body ignore.
Source/Game-Lib/Game-Lib/Scripting/UI/Widget.cpp	Avoid redundant dirtying; adds clip/mask slot reserve/release hooks.
Source/Game-Lib/Game-Lib/Scripting/UI/Text.cpp	Avoid redundant text refresh; limits clipper refresh to clip sources.
Source/Game-Lib/Game-Lib/Scripting/UI/Panel.cpp	Marks correct dirty components when size/color/alpha change.
Source/Game-Lib/Game-Lib/Scripting/Handlers/UIHandler.h	Removes old Time API exposure from UIHandler.
Source/Game-Lib/Game-Lib/Scripting/Handlers/UIHandler.cpp	Removes old Time table registration logic.
Source/Game-Lib/Game-Lib/Scripting/Handlers/TimeHandler.h	New dedicated Time Lua handler API.
Source/Game-Lib/Game-Lib/Scripting/Handlers/TimeHandler.cpp	Implements Time Lua handler + second-changed callback.
Source/Game-Lib/Game-Lib/Scripting/Handlers/SceneHandler.h	New Scene Lua handler API for editor tooling (entity queries + component access).
Source/Game-Lib/Game-Lib/Scripting/Handlers/MapHandler.h	New Map Lua handler API (list/load/unload/progress/current-map callback).
Source/Game-Lib/Game-Lib/Scripting/Handlers/MapHandler.cpp	Implements Map Lua handler, map list generation, load/unload, callback wiring.
Source/Game-Lib/Game-Lib/Scripting/Handlers/GlobalHandler.h	Removes legacy global map functions.
Source/Game-Lib/Game-Lib/Scripting/Handlers/GlobalHandler.cpp	Removes legacy global map implementations.
Source/Game-Lib/Game-Lib/Scripting/Handlers/EditorToolHandler.h	New Editor Lua handler API (selection, picking, gizmo, debug draw toggles).
Source/Game-Lib/Game-Lib/Scripting/Handlers/EditorToolHandler.cpp	Implements Editor handler: selection routing + callback refs + gizmo state.
Source/Game-Lib/Game-Lib/Scripting/Handlers/CameraHandler.h	New Camera Lua handler API (transform info, saves, callbacks).
Source/Game-Lib/Game-Lib/Scripting/Handlers/CameraHandler.cpp	Implements Camera handler + startup-save apply + callbacks.
Source/Game-Lib/Game-Lib/Scripting/Handlers/AssetHandler.h	New Asset Lua handler API (filesystem listing + model spawn/drag-spawn).
Source/Game-Lib/Game-Lib/Scripting/Handlers/AssetHandler.cpp	Implements asset listing + model spawn + drag-spawn request staging.
Source/Game-Lib/Game-Lib/Rendering/Terrain/TerrainLoader.cpp	Adds current-map-changed Lua notification; clears editor selection on unload.
Source/Game-Lib/Game-Lib/Rendering/Model/ModelLoader.h	Adds API to query Jolt body id by instance id.
Source/Game-Lib/Game-Lib/Rendering/Model/ModelLoader.cpp	Implements GetBodyIDFromInstanceID.
Source/Game-Lib/Game-Lib/Rendering/GameRenderer.cpp	Reorders debug renderer update and unlocks uploads after render.
Source/Game-Lib/Game-Lib/Rendering/Debug/DebugRenderer.h	Adds overlay solid-triangle draw path and GPU sync helper.
Source/Game-Lib/Game-Lib/Rendering/Debug/DebugRenderer.cpp	Adds overlay pipeline + buffers; moves CPU->GPU sync to Update; fixes solid triangle emission.
Source/Game-Lib/Game-Lib/Rendering/Canvas/CanvasRenderer.h	Adds matrix/clip/mask buffer APIs + draw-data packing changes + bucket patching metadata.
Source/Game-Lib/Game-Lib/Gameplay/MapLoader.cpp	Clears editor selection on map unload.
Source/Game-Lib/Game-Lib/Editor/Viewport.h	Removes Inspector pointer plumbing.
Source/Game-Lib/Game-Lib/Editor/Viewport.cpp	Removes Inspector include + setter.
Source/Game-Lib/Game-Lib/Editor/MapSelector.h	Removes ImGui Map selector editor.
Source/Game-Lib/Game-Lib/Editor/MapSelector.cpp	Removes ImGui Map selector implementation.
Source/Game-Lib/Game-Lib/Editor/Inspector.h	Removes ImGui Inspector editor.
Source/Game-Lib/Game-Lib/Editor/Hierarchy.h	Removes ImGui Hierarchy editor.
Source/Game-Lib/Game-Lib/Editor/Hierarchy.cpp	Removes ImGui Hierarchy implementation.
Source/Game-Lib/Game-Lib/Editor/EditorHandler.h	Removes stored pointers/accessors for removed ImGui editors.
Source/Game-Lib/Game-Lib/Editor/EditorHandler.cpp	Stops creating removed ImGui editors; updates default docking layout.
Source/Game-Lib/Game-Lib/Editor/CameraInfo.h	Removes ImGui Camera Info editor.
Source/Game-Lib/Game-Lib/Editor/CameraInfo.cpp	Removes ImGui Camera Info implementation.
Source/Game-Lib/Game-Lib/Editor/AssetBrowser.h	Removes ImGui Asset Browser editor.
Source/Game-Lib/Game-Lib/Editor/ActionStack.cpp	Removes Inspector coupling on undo.
Source/Game-Lib/Game-Lib/ECS/Util/UIUtil.h	Adds clip ancestor + clip/mask slot management APIs.
Source/Game-Lib/Game-Lib/ECS/Util/UIUtil.cpp	Implements clip slot reservation/recompute; changes text refresh sizing change detection.
Source/Game-Lib/Game-Lib/ECS/Util/Transforms.h	Removes ImGui Inspector friend access.
Source/Game-Lib/Game-Lib/ECS/Util/Transform2D.h	Adds dirty-kind classification; on-demand world matrix/translation composition helpers.
Source/Game-Lib/Game-Lib/ECS/Util/Transform2D.cpp	Reduces descendant propagation for local pose changes; special-cases size changes.
Source/Game-Lib/Game-Lib/ECS/Util/Database/CameraUtil.cpp	Notifies Lua Camera handler when saves change.
Source/Game-Lib/Game-Lib/ECS/Systems/UpdateDayNightCycle.cpp	Routes second-changed notifications to new Time handler.
Source/Game-Lib/Game-Lib/ECS/Systems/UI/UpdateBoundingRects.cpp	Updates only moved rects; re-derives clip sources when ancestors move.
Source/Game-Lib/Game-Lib/ECS/Systems/UI/HandleInput.cpp	Refactors hover walk to compose translations top-down + clip pruning + clip-respecting hit tests.
Source/Game-Lib/Game-Lib/ECS/Systems/Editor/EditorTools.h	Adds new per-frame editor tools system skeleton (Lua-driven inspector support).
Source/Game-Lib/Game-Lib/ECS/Systems/CalculateCameraMatrices.cpp	Notifies Lua Camera handler on camera view changes.
Source/Game-Lib/Game-Lib/ECS/Singletons/UISingleton.h	Tracks clip-source entities for incremental re-derivation.
Source/Game-Lib/Game-Lib/ECS/Singletons/EditorSelection.h	New shared editor selection/gizmo state singleton.
Source/Game-Lib/Game-Lib/ECS/Scheduler.cpp	Registers EditorSelection + EditorTools system in ECS schedule.
Source/Game-Lib/Game-Lib/ECS/Components/UI/Widget.h	Adds gpuMatrixSlot for GPU transform chaining.
Source/Game-Lib/Game-Lib/ECS/Components/UI/Text.h	Adds GPU allocation capacities + bucket slot for incremental patching.
Source/Game-Lib/Game-Lib/ECS/Components/UI/Clipper.h	Adds clip/mask buffer slot indices.
Source/Game-Lib/Game-Lib/Application/Application.cpp	Registers new Lua handlers (Time/Camera/Map/Scene/Editor/Asset).

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