This represents UE4/Main @18073326, Release-5.0 @18081140 and Dev-PerfTest @18045971
[CL 18081471 by aurel cordonnier in ue5-release-engine-test branch]
Basic approach is to add HLSL types FLWCScalar, FLWCMatrix, FLWCVector, etc. Inside shaders, absolute world space position values should be represented as FLWCVector3. Matrices that transform *into* absolute world space become FLWCMatrix. Matrices that transform *from* world space become FLWCInverseMatrix. Generally LWC values work by extending the regular 'float' value with an additional tile coordinate. Final tile size will be a trade-off between scale/accuracy; I'm using 256k for now, but may need to be adjusted. Value represented by a FLWCVector thus becomes V.Tile * TileSize + V.Offset. Most operations can be performed directly on LWC values. There are HLSL functions like LWCAdd, LWCSub, LWCMultiply, LWCDivide (operator overloading would be really nice here). The goal is to stay with LWC values for as long as needed, then convert to regular float values when possible. One thing that comes up a lot is working in translated (rather than absolute) world space. WorldSpace + View.PrevPreViewTranslation = TranslatedWorldspace. Except 'View.PrevPreViewTranslation' is now a FLWCVector3, and WorldSpace quantities should be as well. So that becomes LWCAdd(WorldSpace, View.PrevPreViewTranslation) = TranslatedWorldspace. Assuming that we're talking about a position that's "reasonably close" to the camera, it should be safe to convert the translated WS value to float. The 'tile' coordinate of the 2 LWC values should cancel out when added together in this case. I've done some work throughout the shader code to do this. Materials are fully supporting LWC-values as well. Projective texturing and vertex animation materials that I've tested work correctly even when positioned "far away" from the origin.
Lots of work remains to fully convert all of our shader code. There's a function LWCHackToFloat(), which is a simple wrapper for LWCToFloat(). The idea of HackToFloat is to mark places that need further attention, where I'm simply converting absolute WS positions to float, to get shaders to compile. Shaders converted in this way should continue to work for all existing content (without LWC-scale values), but they will break if positions get too large.
General overview of changed files:
LargeWorldCoordinates.ush - This defines the FLWC types and operations
GPUScene.cpp, SceneData.ush - Primitives add an extra 'float3' tile coordinate. Instance data is unchanged, so instances need to stay within single-precision range of the primitive origin. Could potentially split instances behind the scenes (I think) if we don't want this limitation
HLSLMaterialDerivativeAutogen.cpp, HLSLMaterialTranslator.cpp, Preshader.cpp - Translated materials to use LWC values
SceneView.cpp, SceneRelativeViewMatrices.cpp, ShaderCompiler.cpp, InstancedStereo.ush - View uniform buffer includes LWC values where appropriate
#jira UE-117101
#rb arne.schober, Michael.Galetzka
#ROBOMERGE-AUTHOR: ben.ingram
#ROBOMERGE-SOURCE: CL 17787435 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v881-17767770)
[CL 17787478 by ben ingram in ue5-release-engine-test branch]
For Forward ES31
Default SceneColor RG11B10 + R16F\32F Depth texture
With PropagateAlpha on RGBA16F + R16F\32F
PostProcess we sample SceneDepthAux for Depth
For Deferred ES31
SceneDepthAux only for Metal
PropagateAlpha not working yet
PostProcess we sample SceneDepthTexture for Depth
cvar to change Depth texture from 16 to 32Fr.Mobile.SceneDepthAux
cvar for AlphaPropagate r.Mobile.PropagateAlpha
#jira UE-98033
#rb Dmitriy.Dyomin, Carl.Lloyd, Jack.Porter
#ROBOMERGE-SOURCE: CL 16644095 in //UE5/Main/...
#ROBOMERGE-BOT: STARSHIP (Main -> Release-Engine-Test) (v833-16641396)
[CL 16644108 by florin pascu in ue5-release-engine-test branch]
2.Make pixel projected reflection using last frame scenecolor and scenedepth to avoid to split mobile base pass and translucency pass.
3.Support GTAO and PPR for mobile deferred renderer.
#jira none
#rb Dmitriy.Dyomin, Jack.Porter, Mi.Wang
[CL 15651055 by Wei Liu in ue5-main branch]
TextureResource can be updated inside UTexture and cached FTexture pointer inside reflection capture will get stale
#rb jack.porter, florin.pasku
#ROBOMERGE-SOURCE: CL 15637557 in //UE5/Release-5.0-EarlyAccess/...
#ROBOMERGE-BOT: STARSHIP (Release-5.0-EarlyAccess -> Main) (v778-15633161)
[CL 15637589 by dmitriy dyomin in ue5-main branch]
Pass / view uniform buffers are no longer bound through mesh draw commands. Instead, they are bound using static bindings on the RDG pass. This is necessary because pass uniform buffers contain RDG resources, which need to be declared to RDG.
#rb christopher.waters, Dmitriy.Dyomin
[CL 14899861 by zach bethel in ue5-main branch]
#jira UE-90038
#rb mi.wang
#ROBOMERGE-SOURCE: CL 11894642 in //UE4/Release-4.25/... via CL 11894643
#ROBOMERGE-BOT: RELEASE (Release-4.25Plus -> Main) (v656-11643781)
[CL 11894644 by wei liu in Main branch]
