#rnx
#rb none
#ROBOMERGE-SOURCE: CL 10869240 via CL 10869516 via CL 10869902
#ROBOMERGE-BOT: (v613-10869866)
[CL 10870584 by ryan durand in Main branch]
#lockdown Nick.Penwarden
#rb none
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MAJOR FEATURES + CHANGES
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Change 3209340 on 2016/11/23 by Ben.Marsh
Convert UE4 codebase to an "include what you use" model - where every header just includes the dependencies it needs, rather than every source file including large monolithic headers like Engine.h and UnrealEd.h.
Measured full rebuild times around 2x faster using XGE on Windows, and improvements of 25% or more for incremental builds and full rebuilds on most other platforms.
* Every header now includes everything it needs to compile.
* There's a CoreMinimal.h header that gets you a set of ubiquitous types from Core (eg. FString, FName, TArray, FVector, etc...). Most headers now include this first.
* There's a CoreTypes.h header that sets up primitive UE4 types and build macros (int32, PLATFORM_WIN64, etc...). All headers in Core include this first, as does CoreMinimal.h.
* Every .cpp file includes its matching .h file first.
* This helps validate that each header is including everything it needs to compile.
* No engine code includes a monolithic header such as Engine.h or UnrealEd.h any more.
* You will get a warning if you try to include one of these from the engine. They still exist for compatibility with game projects and do not produce warnings when included there.
* There have only been minor changes to our internal games down to accommodate these changes. The intent is for this to be as seamless as possible.
* No engine code explicitly includes a precompiled header any more.
* We still use PCHs, but they're force-included on the compiler command line by UnrealBuildTool instead. This lets us tune what they contain without breaking any existing include dependencies.
* PCHs are generated by a tool to get a statistical amount of coverage for the source files using it, and I've seeded the new shared PCHs to contain any header included by > 15% of source files.
Tool used to generate this transform is at Engine\Source\Programs\IncludeTool.
[CL 3209342 by Ben Marsh in Main branch]
Major changes:
- The widget reflector UI now uses tabs. The hierarchy and stats views have been moved to tabs, and new tabs have been added to support picking widgets from a snapshot.
- The widget reflector node trees are no longer using UObject types. The idea here was to make the serialization easier, but it didn't work and I ended up using JSON instead.
- When you take or load a widget snapshot, you're now shown the screenshot of the window associated with that snapshot, and are able to pick widgets from it as you would do with a live tree.
API changes:
- The tab spawners for the widget reflector and atlas visualizers are now registered automatically when the SlateReflector module is loaded. These are now the only way to create these windows.
- The tabbed layout within the widget reflector has made it impossible to create the widget reflector unless spawned via a tab manager. To this end, the following functions have been removed from ISlateReflectorModule:
- GetWidgetReflector
- GetAtlasVisualizer
- GetTextureAtlasVisualizer
- GetFontAtlasVisualizer
- These functions used to be used to create a raw widget reflector or atlas viewer widget.
- If you were doing this because you were placing it into your own window, you can take advantage of the fact that the widget reflector tab spawner is always available, and use the global tab manager to create your window and place a spawned widget reflector tab inside it - SummonPerfTestSuite in SPerfSuite.cpp provides an example of this.
- If you were doing this in the handler of your own widget reflector tab spawner, you can either just use the standard widget reflector tab spawner instead (you need to load the SlateReflector module once, and then "WidgetReflector" will be available to spawn via the global tab manager), or you can just use the DisplayWidgetReflector function of ISlateReflectorModule (which will internally do the same thing).
[CL 2661609 by Jamie Dale in Main branch]
Moved the existing atlas visualizer out of the Slate RHI renderer and instead made the resource manager for each renderer implement the ISlateAtlasProvider interface to provide information about its current texture atlases. FSlateFontCache implements ISlateAtlasProvider for the font atlas viewer.
Improved the atlas visualizer and added support for zooming and panning of the atlas pages. This helps greatly when viewing font atlases as they can be as large as 2048x2048.
#codereview Matt.Kuhlenschmidt
[CL 2371483 by Jamie Dale in Main branch]
