#lockdown Nick.Penwarden
#rb none
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MAJOR FEATURES + CHANGES
==========================
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]
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MAJOR FEATURES + CHANGES
==========================
Change 2717513 on 2015/10/06 by Robert.Manuszewski@Robert_Manuszewski_EGUK_M1
GC and WeakObjectPtr performance optimizations.
- Moved some of the EObjectFlags to EInternalObjectFlags and merged them with FUObjectArray
- Moved WeakObjectPtr serial numbersto FUObjectArray
- Added pre-allocated UObject array
Change 2716517 on 2015/10/05 by Robert.Manuszewski@Robert_Manuszewski_EGUK_M1
Make SavePackage thread safe UObject-wise so that StaticFindObject etc can't run in parallel when packages are being saved.
Change 2721142 on 2015/10/08 by Mikolaj.Sieluzycki@Dev-Core_D0920
UHT will now use makefiles to speed up iterative runs.
Change 2726320 on 2015/10/13 by Jaroslaw.Palczynski@jaroslaw.palczynski_D1732_2963
Hot-reload performance optimizations:
1. Got rid of redundant touched BPs optimization (which was necessary before major HR fixes submitted earlier).
2. Parallelized search for old CDOs referencers.
Change 2759032 on 2015/11/09 by Graeme.Thornton@GThornton_DesktopMaster
Dependency preloading improvements
- Asset registry dependencies now resolve asset redirectors
- Rearrange runtime loading to put dependency preloads within BeginLoad/EndLoad for the source package
Change 2754342 on 2015/11/04 by Robert.Manuszewski@Robert_Manuszewski_Stream1
Allow UnfocusedVolumeMultiplier to be set programmatically
Change 2764008 on 2015/11/12 by Robert.Manuszewski@Robert_Manuszewski_Stream1
When cooking, don't add imports that are outers of objects excluded from the current cook target.
Change 2755562 on 2015/11/05 by Steve.Robb@Dev-Core
Inline storage for TFunction.
Fix for delegate inline storage on Win64.
Some build fixes.
Visualizer fixes for new TFunction format.
Change 2735084 on 2015/10/20 by Jaroslaw.Surowiec@Stream.1.JarekSurowiec
CrashReporter Web - Search by Platform
Added initial support for streams (GetBranchesAsListItems, CopyToJira)
Change 2762387 on 2015/11/11 by Steve.Robb@Dev-Core
Unnecessary allocation removed when loading empty files in FFileHelper::LoadFileToString.
Change 2762632 on 2015/11/11 by Steve.Robb@Dev-Core
Some TSet function optimisations:
Avoiding unnecessary hashing of function arguments if the container is empty (rather than the hash being empty, which is not necessarily equivalent).
Taking local copies of HashSize during iterations.
Change 2762936 on 2015/11/11 by Steve.Robb@Dev-Core
BulkData zero byte allocations are now handled by an RAII object which owns the memory.
Change 2765758 on 2015/11/13 by Steve.Robb@Dev-Core
FName::operator== and != optimised to be a single comparison.
Change 2757195 on 2015/11/06 by Jaroslaw.Surowiec@Stream.1.JarekSurowiec
PR #1305: Improvements in CrashReporter for Symbol Server usage (Contributed by bozaro)
Change 2760778 on 2015/11/10 by Jaroslaw.Surowiec@Stream.1.JarekSurowiec
PR #1725: Fixed typos in ProfilerCommon.h; Added comments (Contributed by BGR360)
Also fixed starting condition.
Change 2739804 on 2015/10/23 by Robert.Manuszewski@Robert_Manuszewski_Stream1
PR #1470: [UObjectGlobals] Do not overwrite instanced subobjects with ones from CDO (Contributed by slonopotamus)
Change 2744733 on 2015/10/28 by Steve.Robb@Dev-Core
PR #1540 - Specifying a different Saved folder at launch through a command line parameter
Integrated and optimized.
#lockdown Nick.Penwarden
[CL 2772222 by Robert Manuszewski in Main branch]
