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UnrealEngine/Engine/Source/Runtime/Renderer/Private/StochasticLighting/StochasticLighting.cpp
Brandyn / Techy fcc1b09210 init
2026-04-04 15:40:51 -05:00

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// Copyright Epic Games, Inc. All Rights Reserved.
#include "StochasticLighting.h"
#include "RendererPrivate.h"
#include "Lumen/LumenScreenProbeGather.h"
#include "Lumen/LumenShortRangeAO.h"
#include "Lumen/LumenReflections.h"
#include "MegaLights/MegaLights.h"
#include "MegaLights/MegaLightsViewState.h"
#include "BasePassRendering.h"
static TAutoConsoleVariable<int32> CVarStochasticLightingFixedStateFrameIndex(
TEXT("r.StochasticLighting.FixedStateFrameIndex"),
-1,
TEXT("Whether to override View.StateFrameIndex for debugging."),
ECVF_RenderThreadSafe);
namespace StochasticLighting
{
constexpr int32 TileSize = 8;
constexpr int32 DownsampleFactor = 2;
int32 GetStateFrameIndex(const FSceneViewState* ViewState)
{
int32 StateFrameIndex = CVarStochasticLightingFixedStateFrameIndex.GetValueOnRenderThread();
if (StateFrameIndex < 0)
{
StateFrameIndex = ViewState ? ViewState->GetFrameIndex() : 0;
}
return StateFrameIndex;
}
bool IsStateFrameIndexOverridden()
{
return CVarStochasticLightingFixedStateFrameIndex.GetValueOnRenderThread() >= 0;
}
void InitDefaultHistoryScreenParameters(FHistoryScreenParameters& OutHistoryScreenParameters)
{
OutHistoryScreenParameters.EncodedHistoryScreenCoordTexture = nullptr;
OutHistoryScreenParameters.PackedPixelDataTexture = nullptr;
OutHistoryScreenParameters.HistoryScreenPositionScaleBias = FVector4f(1.0f, 1.0f, 0.0f, 0.0f);
OutHistoryScreenParameters.HistoryUVMinMax = FVector4f::Zero();
OutHistoryScreenParameters.HistoryGatherUVMinMax = FVector4f::Zero();
OutHistoryScreenParameters.HistoryBufferSizeAndInvSize = FVector4f::Zero();
OutHistoryScreenParameters.HistorySubPixelGridSizeAndInvSize = FVector4f::Zero();
OutHistoryScreenParameters.HistoryScreenCoordDecodeShift = FIntPoint::ZeroValue;
}
void GetHistoryScreenCoordCodec(FIntPoint HistoryBufferSize, FVector4f& OutSubPixelGridSizeAndInvSize, FIntPoint& OutDecodeShift)
{
if (HistoryBufferSize.X <= 0 || HistoryBufferSize.Y <= 0)
{
OutSubPixelGridSizeAndInvSize = FVector4f::Zero();
OutDecodeShift = FIntPoint::ZeroValue;
}
else
{
FIntPoint SubPixelGridSize = FIntPoint(MAX_uint16) / HistoryBufferSize;
OutDecodeShift = FIntPoint(FMath::FloorLog2(SubPixelGridSize.X), FMath::FloorLog2(SubPixelGridSize.Y));
SubPixelGridSize = FIntPoint(1u << OutDecodeShift.X, 1u << OutDecodeShift.Y);
OutSubPixelGridSizeAndInvSize = FVector4f(float(SubPixelGridSize.X), float(SubPixelGridSize.Y), 1.0f / SubPixelGridSize.X, 1.0f / SubPixelGridSize.Y);
}
}
}
class FStochasticLightingTileClassificationMarkCS : public FGlobalShader
{
DECLARE_GLOBAL_SHADER(FStochasticLightingTileClassificationMarkCS)
SHADER_USE_PARAMETER_STRUCT(FStochasticLightingTileClassificationMarkCS, FGlobalShader)
BEGIN_SHADER_PARAMETER_STRUCT(FParameters, )
SHADER_PARAMETER_STRUCT_REF(FViewUniformShaderParameters, View)
SHADER_PARAMETER_STRUCT_INCLUDE(FSceneTextureParameters, SceneTextures)
SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FSceneTextureUniformParameters, SceneTexturesStruct)
SHADER_PARAMETER_STRUCT_INCLUDE(FLumenFrontLayerTranslucencyGBufferParameters, FrontLayerTranslucencyGBufferParameters)
SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FSubstrateGlobalUniformParameters, Substrate)
SHADER_PARAMETER_RDG_TEXTURE(Texture2D, DepthHistoryTexture)
SHADER_PARAMETER_RDG_TEXTURE(Texture2D<float4>, NormalAndShadingInfoHistory)
SHADER_PARAMETER_RDG_TEXTURE(Texture2D<half>, MegaLightsNumFramesAccumulatedHistory)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2DArray<uint>, RWLumenTileBitmask)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2DArray<uint>, RWMegaLightsTileBitmask)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<float>, RWDepthTexture)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<float3>, RWNormalTexture)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<float>, RWDownsampledSceneDepth2x1)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<float>, RWDownsampledSceneDepth2x2)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<UNORM float3>, RWDownsampledWorldNormal2x1)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<UNORM float3>, RWDownsampledWorldNormal2x2)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<uint>, RWEncodedHistoryScreenCoord)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2DArray<uint>, RWLumenPackedPixelData)
SHADER_PARAMETER_RDG_TEXTURE_UAV(RWTexture2D<uint>, RWMegaLightsPackedPixelData)
SHADER_PARAMETER_STRUCT_INCLUDE(LumenScreenProbeGather::FTileClassifyParameters, ScreenProbeGatherTileClassifyParameters)
SHADER_PARAMETER_STRUCT_INCLUDE(LumenReflections::FCompositeParameters, ReflectionsCompositeParameters)
SHADER_PARAMETER_STRUCT_INCLUDE(MegaLights::FTileClassifyParameters, MegaLightsTileClassifyParameters)
SHADER_PARAMETER_STRUCT_INCLUDE(StochasticLighting::FHistoryScreenParameters, HistoryScreenParameters)
SHADER_PARAMETER(uint32, ReflectionPass)
SHADER_PARAMETER(FIntPoint, DownsampledViewMin2x1)
SHADER_PARAMETER(FIntPoint, DownsampledViewSize2x1)
SHADER_PARAMETER(FIntPoint, DownsampledViewMin2x2)
SHADER_PARAMETER(FIntPoint, DownsampledViewSize2x2)
SHADER_PARAMETER(uint32, LumenStochasticSampleMode)
SHADER_PARAMETER(uint32, MegaLightsStochasticSampleMode)
SHADER_PARAMETER(uint32, StochasticLightingStateFrameIndex)
SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FForwardLightUniformParameters, ForwardLightStruct)
SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FHairStrandsViewUniformParameters, HairStrands)
SHADER_PARAMETER_STRUCT_REF(FBlueNoise, BlueNoise)
SHADER_PARAMETER(uint32, TileEncoding)
SHADER_PARAMETER(uint32, bRectPrimitive)
SHADER_PARAMETER_ARRAY(FUintVector4, TileListBufferOffsets, [SUBSTRATE_TILE_TYPE_COUNT])
SHADER_PARAMETER_RDG_BUFFER_UAV(RWBuffer, TileDrawIndirectDataBufferUAV)
SHADER_PARAMETER_RDG_BUFFER_UAV(RWBuffer, TileListBufferUAV)
RDG_BUFFER_ACCESS(TileIndirectBuffer, ERHIAccess::IndirectArgs)
END_SHADER_PARAMETER_STRUCT()
class FCopyDepthAndNormal : SHADER_PERMUTATION_BOOL("COPY_DEPTH_AND_NORMAL");
class FStochasticSampleOffset : SHADER_PERMUTATION_ENUM_CLASS("STOCHASTIC_SAMPLE_OFFSET", StochasticLighting::EStochasticSampleOffset);
class FTileClassifyLumen : SHADER_PERMUTATION_BOOL("TILE_CLASSIFY_LUMEN");
class FTileClassifyMegaLights : SHADER_PERMUTATION_BOOL("TILE_CLASSIFY_MEGALIGHTS");
class FTileClassifySubstrate : SHADER_PERMUTATION_BOOL("TILE_CLASSIFY_SUBSTRATE");
class FReprojectLumen : SHADER_PERMUTATION_BOOL("REPROJECT_LUMEN");
class FReprojectMegaLights : SHADER_PERMUTATION_BOOL("REPROJECT_MEGALIGHTS");
class FHistoryRejectBasedOnNormal : SHADER_PERMUTATION_BOOL("HISTORY_REJECT_BASED_ON_NORMAL");
class FMaterialSource : SHADER_PERMUTATION_ENUM_CLASS("MATERIAL_SOURCE", StochasticLighting::EMaterialSource);
class FOverflowTile : SHADER_PERMUTATION_BOOL("PERMUTATION_OVERFLOW_TILE");
using FPermutationDomain = TShaderPermutationDomain<
FCopyDepthAndNormal,
FStochasticSampleOffset,
FTileClassifyLumen,
FTileClassifyMegaLights,
FTileClassifySubstrate,
FReprojectLumen,
FReprojectMegaLights,
FHistoryRejectBasedOnNormal,
FMaterialSource,
FOverflowTile>;
static FPermutationDomain RemapPermutation(FPermutationDomain PermutationVector, EShaderPlatform InPlatform)
{
if (!Substrate::IsSubstrateEnabled())
{
PermutationVector.Set<FOverflowTile>(false);
PermutationVector.Set<FTileClassifySubstrate>(false);
}
else if (!Substrate::IsSubstrateBlendableGBufferEnabled(InPlatform))
{
// Only available with Format=0 (blendable GBuffer)
PermutationVector.Set<FTileClassifySubstrate>(false);
}
if (PermutationVector.Get<FStochasticSampleOffset>() == StochasticLighting::EStochasticSampleOffset::Both)
{
PermutationVector.Set<FMaterialSource>(StochasticLighting::EMaterialSource::GBuffer);
}
if (PermutationVector.Get<FMaterialSource>() != StochasticLighting::EMaterialSource::GBuffer)
{
PermutationVector.Set<FOverflowTile>(false);
if (PermutationVector.Get<FMaterialSource>() == StochasticLighting::EMaterialSource::HairStrands)
{
PermutationVector.Set<FTileClassifyLumen>(false);
}
else
{
PermutationVector.Set<FCopyDepthAndNormal>(false);
PermutationVector.Set<FStochasticSampleOffset>(StochasticLighting::EStochasticSampleOffset::None);
PermutationVector.Set<FTileClassifyMegaLights>(false);
PermutationVector.Set<FReprojectLumen>(false);
}
}
if (PermutationVector.Get<FOverflowTile>())
{
PermutationVector.Set<FCopyDepthAndNormal>(false);
PermutationVector.Set<FStochasticSampleOffset>(StochasticLighting::EStochasticSampleOffset::None);
PermutationVector.Set<FTileClassifyMegaLights>(false);
}
if (!PermutationVector.Get<FTileClassifyLumen>())
{
PermutationVector.Set<FReprojectLumen>(false);
}
if (!PermutationVector.Get<FTileClassifyMegaLights>())
{
PermutationVector.Set<FReprojectMegaLights>(false);
}
if (!PermutationVector.Get<FReprojectLumen>())
{
PermutationVector.Set<FHistoryRejectBasedOnNormal>(false);
}
return PermutationVector;
}
static bool ShouldCompilePermutation(const FGlobalShaderPermutationParameters& Parameters)
{
FPermutationDomain PermutationVector(Parameters.PermutationId);
if (RemapPermutation(PermutationVector, Parameters.Platform) != PermutationVector)
{
return false;
}
return DoesPlatformSupportLumenGI(Parameters.Platform) || MegaLights::ShouldCompileShaders(Parameters.Platform);
}
static int32 GetGroupSize()
{
return 8;
}
static void ModifyCompilationEnvironment(const FGlobalShaderPermutationParameters& Parameters, FShaderCompilerEnvironment& OutEnvironment)
{
FGlobalShader::ModifyCompilationEnvironment(Parameters, OutEnvironment);
FForwardLightingParameters::ModifyCompilationEnvironment(Parameters.Platform, OutEnvironment);
OutEnvironment.SetDefine(TEXT("THREADGROUP_SIZE"), GetGroupSize());
FPermutationDomain PermutationVector(Parameters.PermutationId);
if (PermutationVector.Get<FMaterialSource>() == StochasticLighting::EMaterialSource::FrontLayerGBuffer)
{
OutEnvironment.SetDefine(TEXT("FRONT_LAYER_TRANSLUCENCY"), 1);
}
}
};
IMPLEMENT_GLOBAL_SHADER(FStochasticLightingTileClassificationMarkCS, "/Engine/Private/StochasticLighting/StochasticLightingTileClassification.usf", "StochasticLightingTileClassificationMarkCS", SF_Compute);
StochasticLighting::FContext::FContext(
FRDGBuilder& InGraphBuilder,
const FMinimalSceneTextures& InSceneTextures,
const FLumenFrontLayerTranslucencyGBufferParameters& InFrontLayerTranslucencyGBuffer,
StochasticLighting::EMaterialSource InMaterialSource)
: GraphBuilder(InGraphBuilder)
, SceneTextures(InSceneTextures)
, FrontLayerTranslucencyGBuffer(InFrontLayerTranslucencyGBuffer)
, MaterialSource(InMaterialSource)
{}
void StochasticLighting::FContext::Validate(const StochasticLighting::FRunConfig& RunConfig) const
{
if (RunConfig.bSubstrateOverflow)
{
check(MaterialSource == EMaterialSource::GBuffer);
}
if (RunConfig.bCopyDepthAndNormal)
{
check(DepthHistoryUAV && NormalHistoryUAV);
}
if (RunConfig.bDownsampleDepthAndNormal2x1)
{
check(DownsampledSceneDepth2x1UAV && DownsampledWorldNormal2x1UAV);
}
if (RunConfig.bDownsampleDepthAndNormal2x2)
{
check(DownsampledSceneDepth2x2UAV && DownsampledWorldNormal2x2UAV);
}
if (RunConfig.bTileClassifyLumen)
{
check(LumenTileBitmaskUAV);
}
if (RunConfig.bTileClassifyMegaLights)
{
check(MegaLightsTileBitmaskUAV);
}
if (RunConfig.bReprojectLumen)
{
check(RunConfig.bTileClassifyLumen && EncodedHistoryScreenCoordUAV && LumenPackedPixelDataUAV);
}
if (RunConfig.bReprojectMegaLights)
{
check(RunConfig.bTileClassifyMegaLights && EncodedHistoryScreenCoordUAV && MegaLightsPackedPixelDataUAV);
}
}
void StochasticLighting::FContext::Run(const FViewInfo& View, EReflectionsMethod ViewReflectionsMethod, const FRunConfig& RunConfig)
{
Validate(RunConfig);
FBlueNoise BlueNoise = GetBlueNoiseGlobalParameters();
TUniformBufferRef<FBlueNoise> BlueNoiseUniformBuffer = CreateUniformBufferImmediate(BlueNoise, EUniformBufferUsage::UniformBuffer_SingleDraw);
FHistoryScreenParameters HistoryScreenParameters;
InitDefaultHistoryScreenParameters(HistoryScreenParameters);
FRDGTextureRef DepthHistoryTexture = nullptr;
FRDGTextureRef NormalAndShadingInfoHistory = nullptr;
FRDGTextureRef MegaLightsNumFramesAccumulatedHistory = nullptr;
if (View.ViewState)
{
const bool bIsHairStrands = MaterialSource == EMaterialSource::HairStrands;
const FMegaLightsViewState::FResources& MegaLightsViewState = bIsHairStrands ? View.ViewState->MegaLights.HairStrands : View.ViewState->MegaLights.GBuffer;
const FStochasticLightingViewState& StochasticLightingViewState = View.ViewState->StochasticLighting;
if (!View.bCameraCut && !View.bPrevTransformsReset)
{
HistoryScreenParameters.HistoryScreenPositionScaleBias = StochasticLightingViewState.HistoryScreenPositionScaleBias;
HistoryScreenParameters.HistoryUVMinMax = StochasticLightingViewState.HistoryUVMinMax;
HistoryScreenParameters.HistoryGatherUVMinMax = StochasticLightingViewState.HistoryGatherUVMinMax;
HistoryScreenParameters.HistoryBufferSizeAndInvSize = StochasticLightingViewState.HistoryBufferSizeAndInvSize;
GetHistoryScreenCoordCodec(
FIntPoint(HistoryScreenParameters.HistoryBufferSizeAndInvSize.X, HistoryScreenParameters.HistoryBufferSizeAndInvSize.Y),
HistoryScreenParameters.HistorySubPixelGridSizeAndInvSize,
HistoryScreenParameters.HistoryScreenCoordDecodeShift);
if (bIsHairStrands)
{
if (MegaLightsViewState.SceneDepthHistory)
{
DepthHistoryTexture = GraphBuilder.RegisterExternalTexture(MegaLightsViewState.SceneDepthHistory);
}
if (MegaLightsViewState.SceneNormalHistory)
{
NormalAndShadingInfoHistory = GraphBuilder.RegisterExternalTexture(MegaLightsViewState.SceneNormalHistory);
}
}
else
{
if (StochasticLightingViewState.SceneDepthHistory)
{
DepthHistoryTexture = GraphBuilder.RegisterExternalTexture(StochasticLightingViewState.SceneDepthHistory);
}
if (StochasticLightingViewState.SceneNormalHistory)
{
NormalAndShadingInfoHistory = GraphBuilder.RegisterExternalTexture(StochasticLightingViewState.SceneNormalHistory);
}
}
if (MegaLightsViewState.NumFramesAccumulatedHistory)
{
MegaLightsNumFramesAccumulatedHistory = GraphBuilder.RegisterExternalTexture(MegaLightsViewState.NumFramesAccumulatedHistory);
}
}
}
if (OutHistoryScreenParameters)
{
OutHistoryScreenParameters->HistoryScreenPositionScaleBias = HistoryScreenParameters.HistoryScreenPositionScaleBias;
OutHistoryScreenParameters->HistoryUVMinMax = HistoryScreenParameters.HistoryUVMinMax;
OutHistoryScreenParameters->HistoryGatherUVMinMax = HistoryScreenParameters.HistoryGatherUVMinMax;
OutHistoryScreenParameters->HistoryBufferSizeAndInvSize = HistoryScreenParameters.HistoryBufferSizeAndInvSize;
OutHistoryScreenParameters->HistorySubPixelGridSizeAndInvSize = HistoryScreenParameters.HistorySubPixelGridSizeAndInvSize;
OutHistoryScreenParameters->HistoryScreenCoordDecodeShift = HistoryScreenParameters.HistoryScreenCoordDecodeShift;
}
const bool bTileClassifySubstrate = RunConfig.bTileClassifySubstrate && MaterialSource == EMaterialSource::GBuffer;
const bool bHistoryRejectBasedOnNormal = RunConfig.bReprojectLumen && LumenScreenProbeGather::UseRejectBasedOnNormal() && NormalAndShadingInfoHistory;
const FIntPoint DownsampledBufferSize2x1 = FIntPoint::DivideAndRoundUp(SceneTextures.Config.Extent, FIntPoint(2, 1));
const FIntPoint DownsampledViewMin2x1 = FIntPoint::DivideAndRoundUp(View.ViewRect.Min, FIntPoint(2, 1));
const FIntPoint DownsampledViewSize2x1 = FIntPoint::DivideAndRoundUp(View.ViewRect.Size(), FIntPoint(2, 1));
const FIntPoint DownsampledBufferSize2x2 = FIntPoint::DivideAndRoundUp(SceneTextures.Config.Extent, 2);
const FIntPoint DownsampledViewMin2x2 = FIntPoint::DivideAndRoundUp(View.ViewRect.Min, 2);
const FIntPoint DownsampledViewSize2x2 = FIntPoint::DivideAndRoundUp(View.ViewRect.Size(), 2);
const uint32 LumenStochasticSampleMode = uint32(LumenScreenProbeGather::IsUsingDownsampledDepthAndNormal(View) ? EStochasticSampleOffset::DownsampleFactor2x2 : EStochasticSampleOffset::None);
uint32 MegaLightsStochasticSampleMode = (uint32)EStochasticSampleOffset::None;
if (RunConfig.bTileClassifyMegaLights)
{
const FIntPoint MegaLightsDownsampleFactor = MegaLights::GetDownsampleFactorXY(MaterialSource, View.GetShaderPlatform());
if (MegaLightsDownsampleFactor.X == 2)
{
if (MegaLightsDownsampleFactor.Y == 2)
{
MegaLightsStochasticSampleMode = (uint32)EStochasticSampleOffset::DownsampleFactor2x2;
}
else
{
MegaLightsStochasticSampleMode = (uint32)EStochasticSampleOffset::DownsampleFactor2x1;
}
}
else
{
MegaLightsStochasticSampleMode = (uint32)EStochasticSampleOffset::None;
}
}
int32 StateFrameIndex = GetStateFrameIndex(View.ViewState);
if (RunConfig.StateFrameIndexOverride >= 0)
{
StateFrameIndex = RunConfig.StateFrameIndexOverride;
}
EStochasticSampleOffset StochasticSampleOffset = EStochasticSampleOffset::None;
if (RunConfig.bDownsampleDepthAndNormal2x1 && RunConfig.bDownsampleDepthAndNormal2x2)
{
StochasticSampleOffset = EStochasticSampleOffset::Both;
}
else if (RunConfig.bDownsampleDepthAndNormal2x1)
{
StochasticSampleOffset = EStochasticSampleOffset::DownsampleFactor2x1;
}
else if (RunConfig.bDownsampleDepthAndNormal2x2)
{
StochasticSampleOffset = EStochasticSampleOffset::DownsampleFactor2x2;
}
if ((RunConfig.bReprojectLumen || RunConfig.bReprojectMegaLights) && !DepthHistoryTexture)
{
DepthHistoryTexture = GSystemTextures.GetDepthDummy(GraphBuilder);
NormalAndShadingInfoHistory = GSystemTextures.GetBlackDummy(GraphBuilder);
}
if (RunConfig.bReprojectMegaLights && !MegaLightsNumFramesAccumulatedHistory)
{
MegaLightsNumFramesAccumulatedHistory = GSystemTextures.GetBlackDummy(GraphBuilder);
}
FStochasticLightingTileClassificationMarkCS::FPermutationDomain PermutationVector;
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FCopyDepthAndNormal>(RunConfig.bCopyDepthAndNormal);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FStochasticSampleOffset>(StochasticSampleOffset);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FTileClassifyLumen>(RunConfig.bTileClassifyLumen);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FTileClassifyMegaLights>(RunConfig.bTileClassifyMegaLights);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FTileClassifySubstrate>(bTileClassifySubstrate);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FReprojectLumen>(RunConfig.bReprojectLumen);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FReprojectMegaLights>(RunConfig.bReprojectMegaLights);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FHistoryRejectBasedOnNormal>(bHistoryRejectBasedOnNormal);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FMaterialSource>(MaterialSource);
PermutationVector.Set<FStochasticLightingTileClassificationMarkCS::FOverflowTile>(RunConfig.bSubstrateOverflow);
PermutationVector = FStochasticLightingTileClassificationMarkCS::RemapPermutation(PermutationVector, View.GetShaderPlatform());
auto ComputeShader = View.ShaderMap->GetShader<FStochasticLightingTileClassificationMarkCS>(PermutationVector);
FStochasticLightingTileClassificationMarkCS::FParameters* PassParameters = GraphBuilder.AllocParameters<FStochasticLightingTileClassificationMarkCS::FParameters>();
PassParameters->View = View.ViewUniformBuffer;
PassParameters->SceneTextures = GetSceneTextureParameters(GraphBuilder, SceneTextures.UniformBuffer);
PassParameters->SceneTexturesStruct = SceneTextures.UniformBuffer;
PassParameters->FrontLayerTranslucencyGBufferParameters = FrontLayerTranslucencyGBuffer;
PassParameters->Substrate = Substrate::BindSubstrateGlobalUniformParameters(View);
PassParameters->DepthHistoryTexture = DepthHistoryTexture;
PassParameters->NormalAndShadingInfoHistory = NormalAndShadingInfoHistory;
PassParameters->MegaLightsNumFramesAccumulatedHistory = MegaLightsNumFramesAccumulatedHistory;
PassParameters->RWDepthTexture = DepthHistoryUAV;
PassParameters->RWNormalTexture = NormalHistoryUAV;
PassParameters->RWDownsampledSceneDepth2x1 = DownsampledSceneDepth2x1UAV;
PassParameters->RWDownsampledSceneDepth2x2 = DownsampledSceneDepth2x2UAV;
PassParameters->RWDownsampledWorldNormal2x1 = DownsampledWorldNormal2x1UAV;
PassParameters->RWDownsampledWorldNormal2x2 = DownsampledWorldNormal2x2UAV;
PassParameters->RWLumenTileBitmask = LumenTileBitmaskUAV;
PassParameters->RWMegaLightsTileBitmask = MegaLightsTileBitmaskUAV;
PassParameters->RWEncodedHistoryScreenCoord = EncodedHistoryScreenCoordUAV;
PassParameters->RWLumenPackedPixelData = LumenPackedPixelDataUAV;
PassParameters->RWMegaLightsPackedPixelData = MegaLightsPackedPixelDataUAV;
LumenScreenProbeGather::SetupTileClassifyParameters(View, PassParameters->ScreenProbeGatherTileClassifyParameters);
LumenReflections::SetupCompositeParameters(View, ViewReflectionsMethod, PassParameters->ReflectionsCompositeParameters);
MegaLights::SetupTileClassifyParameters(View, PassParameters->MegaLightsTileClassifyParameters);
PassParameters->HistoryScreenParameters = HistoryScreenParameters;
PassParameters->ReflectionPass = (uint32)(MaterialSource == StochasticLighting::EMaterialSource::FrontLayerGBuffer ? ELumenReflectionPass::FrontLayerTranslucency : ELumenReflectionPass::Opaque);
PassParameters->DownsampledViewMin2x1 = DownsampledViewMin2x1;
PassParameters->DownsampledViewSize2x1 = DownsampledViewSize2x1;
PassParameters->DownsampledViewMin2x2 = DownsampledViewMin2x2;
PassParameters->DownsampledViewSize2x2 = DownsampledViewSize2x2;
PassParameters->LumenStochasticSampleMode = LumenStochasticSampleMode;
PassParameters->MegaLightsStochasticSampleMode = MegaLightsStochasticSampleMode;
PassParameters->StochasticLightingStateFrameIndex = StateFrameIndex;
PassParameters->ForwardLightStruct = View.ForwardLightingResources.ForwardLightUniformBuffer;
PassParameters->HairStrands = HairStrands::BindHairStrandsViewUniformParameters(View);
PassParameters->BlueNoise = BlueNoiseUniformBuffer;
if (bTileClassifySubstrate)
{
const FSubstrateViewData* SubstrateViewData = &View.SubstrateViewData;
PassParameters->TileDrawIndirectDataBufferUAV = SubstrateViewData->ClassificationTileDrawIndirectBufferUAV;
PassParameters->TileListBufferUAV = SubstrateViewData->ClassificationTileListBufferUAV;
PassParameters->TileEncoding = SubstrateViewData->TileEncoding;
PassParameters->bRectPrimitive = GRHISupportsRectTopology ? 1 : 0;
for (uint32 TileType = 0; TileType < SUBSTRATE_TILE_TYPE_COUNT; ++TileType)
{
PassParameters->TileListBufferOffsets[TileType] = FUintVector4(SubstrateViewData->ClassificationTileListBufferOffset[TileType], 0, 0, 0);
}
}
if (RunConfig.bSubstrateOverflow)
{
PassParameters->TileIndirectBuffer = View.SubstrateViewData.ClosureTileDispatchIndirectBuffer;
FComputeShaderUtils::AddPass(
GraphBuilder,
RDG_EVENT_NAME("TileClassificationMark(Overflow)"),
RunConfig.ComputePassFlags,
ComputeShader,
PassParameters,
View.SubstrateViewData.ClosureTileDispatchIndirectBuffer,
Substrate::GetClosureTileIndirectArgsOffset(/*InDownsampleFactor*/ 1));
}
else
{
FComputeShaderUtils::AddPass(
GraphBuilder,
RDG_EVENT_NAME("TileClassificationMark"),
RunConfig.ComputePassFlags,
ComputeShader,
PassParameters,
FComputeShaderUtils::GetGroupCount(View.ViewRect.Size(), FStochasticLightingTileClassificationMarkCS::GetGroupSize()));
}
if (bTileClassifySubstrate)
{
// Sanity check
check(!RunConfig.bSubstrateOverflow);
Substrate::AddSubstrateMaterialClassificationIndirectArgsPass(GraphBuilder, View, RunConfig.ComputePassFlags);
}
}
static bool InternalRequiresStochasticLightingPass(const FViewFamilyInfo& ViewFamily, EDiffuseIndirectMethod InDiffuseIndirectMethod, EReflectionsMethod InReflectionsMethod)
{
return InDiffuseIndirectMethod == EDiffuseIndirectMethod::Lumen
|| InReflectionsMethod == EReflectionsMethod::Lumen
|| MegaLights::IsEnabled(ViewFamily)
|| Substrate::UsesStochasticLightingClassification(ViewFamily.GetShaderPlatform());
}
bool FDeferredShadingSceneRenderer::RequiresStochasticLightingPass()
{
for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ++ViewIndex)
{
const FPerViewPipelineState& ViewPipelineState = GetViewPipelineState(Views[ViewIndex]);
if (InternalRequiresStochasticLightingPass(ViewFamily, ViewPipelineState.DiffuseIndirectMethod, ViewPipelineState.ReflectionsMethod))
{
return true;
}
}
return false;
}
/**
* Load GBuffer data once and transform it for subsequent lighting passes
* This includes full res depth and normal copy for opaque before it gets overwritten by water or other translucency writing depth
*/
void FDeferredShadingSceneRenderer::StochasticLightingTileClassificationMark(FRDGBuilder& GraphBuilder, FLumenSceneFrameTemporaries& FrameTemporaries, const FSceneTextures& SceneTextures)
{
const ERDGPassFlags ComputePassFlags = ERDGPassFlags::Compute;
bool bNeedsClear = true;
check(FrameTemporaries.HistoryScreenParameters.IsEmpty());
for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ++ViewIndex)
{
FViewInfo& View = Views[ViewIndex];
const FPerViewPipelineState& ViewPipelineState = GetViewPipelineState(View);
StochasticLighting::FHistoryScreenParameters* HistoryScreenParameters = nullptr;
if (InternalRequiresStochasticLightingPass(ViewFamily, ViewPipelineState.DiffuseIndirectMethod, ViewPipelineState.ReflectionsMethod))
{
const FSceneTextureParameters& SceneTextureParameters = GetSceneTextureParameters(GraphBuilder, SceneTextures);
const uint32 ClosureCount = Substrate::GetSubstrateMaxClosureCount(View);
const FIntPoint MegaLightsDownsampleFactor = MegaLights::GetDownsampleFactorXY(StochasticLighting::EMaterialSource::GBuffer, View.GetShaderPlatform());
const bool bCopyDepthAndNormal = View.ViewState && !View.bStatePrevViewInfoIsReadOnly;
const bool bLumenDiffuseIndirect = ViewPipelineState.DiffuseIndirectMethod == EDiffuseIndirectMethod::Lumen;
const bool bTileClassifyLumen = bLumenDiffuseIndirect || ViewPipelineState.ReflectionsMethod == EReflectionsMethod::Lumen;
const bool bTileClassifyMegaLights = MegaLights::IsEnabled(ViewFamily);
const bool bTileClassifySubstrate = Substrate::UsesStochasticLightingClassification(View.GetShaderPlatform());
const bool bNeedsReprojection = bLumenDiffuseIndirect || bTileClassifyMegaLights;
const bool bDownsampleDepthAndNormal2x1 = bTileClassifyMegaLights && MegaLightsDownsampleFactor == FIntPoint(2, 1);
const bool bDownsampleDepthAndNormal2x2 = (bLumenDiffuseIndirect && LumenScreenProbeGather::IsUsingDownsampledDepthAndNormal(View))
|| (bTileClassifyMegaLights && MegaLightsDownsampleFactor == FIntPoint(2, 2));
FRDGTextureRef DepthHistory = nullptr;
FRDGTextureRef NormalHistory = nullptr;
if (bCopyDepthAndNormal)
{
DepthHistory = FrameTemporaries.DepthHistory.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(SceneTextures.Config.Extent, PF_R32_FLOAT, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.DepthHistory"));
NormalHistory = FrameTemporaries.NormalHistory.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(SceneTextures.Config.Extent, PF_A2B10G10R10, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.NormalAndShadingInfoHistory"));
}
FRDGTextureRef DownsampledSceneDepth2x1 = nullptr;
FRDGTextureRef DownsampledWorldNormal2x1 = nullptr;
if (bDownsampleDepthAndNormal2x1)
{
FIntPoint DownsampledBufferSize = FIntPoint::DivideAndRoundUp(SceneTextures.Config.Extent, FIntPoint(2, 1));
DownsampledSceneDepth2x1 = FrameTemporaries.DownsampledSceneDepth2x1.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(DownsampledBufferSize, PF_R32_FLOAT, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.DownsampledSceneDepth2x1"));
DownsampledWorldNormal2x1 = FrameTemporaries.DownsampledWorldNormal2x1.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(DownsampledBufferSize, PF_A2B10G10R10, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.DownsampledWorldNormal2x1"));
}
FRDGTextureRef DownsampledSceneDepth2x2 = nullptr;
FRDGTextureRef DownsampledWorldNormal2x2 = nullptr;
if (bDownsampleDepthAndNormal2x2)
{
FIntPoint DownsampledBufferSize = FIntPoint::DivideAndRoundUp(SceneTextures.Config.Extent, FIntPoint(2, 2));
DownsampledSceneDepth2x2 = FrameTemporaries.DownsampledSceneDepth2x2.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(DownsampledBufferSize, PF_R32_FLOAT, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.DownsampledSceneDepth2x2"));
DownsampledWorldNormal2x2 = FrameTemporaries.DownsampledWorldNormal2x2.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(DownsampledBufferSize, PF_A2B10G10R10, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.DownsampledWorldNormal2x2"));
}
FRDGTextureRef LumenTileBitmask = nullptr;
if (bTileClassifyLumen)
{
const FIntPoint BufferSize = Substrate::GetSubstrateTextureResolution(View, SceneTextures.Config.Extent);
const FIntPoint BufferSizeInTiles = FIntPoint::DivideAndRoundUp(BufferSize, StochasticLighting::TileSize);
LumenTileBitmask = FrameTemporaries.LumenTileBitmask.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2DArray(BufferSizeInTiles, PF_R8_UINT, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV, ClosureCount),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.LumenTileBitmask"));
}
FRDGTextureRef MegaLightsTileBitmask = nullptr;
if (bTileClassifyMegaLights)
{
const FIntPoint BufferSizeInTiles = FIntPoint::DivideAndRoundUp(SceneTextures.Config.Extent, StochasticLighting::TileSize);
MegaLightsTileBitmask = FrameTemporaries.MegaLightsTileBitmask.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(BufferSizeInTiles, PF_R8_UINT, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.MegaLightsTileBitmask"));
}
FRDGTextureRef EncodedHistoryScreenCoord = nullptr;
FRDGTextureRef LumenPackedPixelData = nullptr;
FRDGTextureRef MegaLightsPackedPixelData = nullptr;
if (bNeedsReprojection)
{
EncodedHistoryScreenCoord = FrameTemporaries.EncodedHistoryScreenCoord.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(SceneTextures.Config.Extent, PF_R32_UINT, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.EncodedHistoryScreenCoord"));
if (bLumenDiffuseIndirect)
{
LumenPackedPixelData = FrameTemporaries.LumenPackedPixelData.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2DArray(SceneTextures.Config.Extent, PF_R8_UINT, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV, ClosureCount),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.LumenPackedPixelData"));
}
if (bTileClassifyMegaLights)
{
MegaLightsPackedPixelData = FrameTemporaries.MegaLightsPackedPixelData.CreateSharedRT(GraphBuilder,
FRDGTextureDesc::Create2D(SceneTextures.Config.Extent, PF_R8_UINT, FClearValueBinding::Black, TexCreate_ShaderResource | TexCreate_UAV),
FrameTemporaries.ViewExtent,
TEXT("StochasticLighting.MegaLightsPackedPixelData"));
}
}
HistoryScreenParameters = GraphBuilder.AllocParameters<StochasticLighting::FHistoryScreenParameters>();
FLumenFrontLayerTranslucencyGBufferParameters FrontLayerTranslucencyGBuffer;
FrontLayerTranslucencyGBuffer.FrontLayerTranslucencyNormal = nullptr;
FrontLayerTranslucencyGBuffer.FrontLayerTranslucencySceneDepth = nullptr;
FRDGTextureUAVRef DepthHistoryUAV = DepthHistory ? GraphBuilder.CreateUAV(DepthHistory, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef NormalHistoryUAV = NormalHistory ? GraphBuilder.CreateUAV(NormalHistory, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef DownsampledSceneDepth2x1UAV = DownsampledSceneDepth2x1 ? GraphBuilder.CreateUAV(DownsampledSceneDepth2x1, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef DownsampledWorldNormal2x1UAV = DownsampledWorldNormal2x1 ? GraphBuilder.CreateUAV(DownsampledWorldNormal2x1, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef DownsampledSceneDepth2x2UAV = DownsampledSceneDepth2x2 ? GraphBuilder.CreateUAV(DownsampledSceneDepth2x2, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef DownsampledWorldNormal2x2UAV = DownsampledWorldNormal2x2 ? GraphBuilder.CreateUAV(DownsampledWorldNormal2x2, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef LumenTileBitmaskUAV = LumenTileBitmask ? GraphBuilder.CreateUAV(LumenTileBitmask, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef MegaLightsTileBitmaskUAV = MegaLightsTileBitmask ? GraphBuilder.CreateUAV(MegaLightsTileBitmask, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef EncodedHistoryScreenCoordUAV = EncodedHistoryScreenCoord ? GraphBuilder.CreateUAV(EncodedHistoryScreenCoord, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef LumenPackedPixelDataUAV = LumenPackedPixelData ? GraphBuilder.CreateUAV(LumenPackedPixelData, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
FRDGTextureUAVRef MegaLightsPackedPixelDataUAV = MegaLightsPackedPixelData ? GraphBuilder.CreateUAV(MegaLightsPackedPixelData, ERDGUnorderedAccessViewFlags::SkipBarrier) : nullptr;
StochasticLighting::FRunConfig RunConfig;
RunConfig.ComputePassFlags = ComputePassFlags;
RunConfig.bCopyDepthAndNormal = DepthHistoryUAV != nullptr;
RunConfig.bDownsampleDepthAndNormal2x1 = DownsampledSceneDepth2x1UAV != nullptr;
RunConfig.bDownsampleDepthAndNormal2x2 = DownsampledSceneDepth2x2UAV != nullptr;
RunConfig.bTileClassifyLumen = LumenTileBitmaskUAV != nullptr;
RunConfig.bTileClassifyMegaLights = MegaLightsTileBitmaskUAV != nullptr;
RunConfig.bTileClassifySubstrate = bTileClassifySubstrate;
RunConfig.bReprojectLumen = LumenPackedPixelDataUAV != nullptr;
RunConfig.bReprojectMegaLights = MegaLightsPackedPixelDataUAV != nullptr;
// TODO: share context between views
StochasticLighting::FContext StochasticLightingContext(GraphBuilder, SceneTextures, FrontLayerTranslucencyGBuffer, StochasticLighting::EMaterialSource::GBuffer);
StochasticLightingContext.DepthHistoryUAV = DepthHistoryUAV;
StochasticLightingContext.NormalHistoryUAV = NormalHistoryUAV;
StochasticLightingContext.DownsampledSceneDepth2x1UAV = DownsampledSceneDepth2x1UAV;
StochasticLightingContext.DownsampledWorldNormal2x1UAV = DownsampledWorldNormal2x1UAV;
StochasticLightingContext.DownsampledSceneDepth2x2UAV = DownsampledSceneDepth2x2UAV;
StochasticLightingContext.DownsampledWorldNormal2x2UAV = DownsampledWorldNormal2x2UAV;
StochasticLightingContext.LumenTileBitmaskUAV = LumenTileBitmaskUAV;
StochasticLightingContext.MegaLightsTileBitmaskUAV = MegaLightsTileBitmaskUAV;
StochasticLightingContext.EncodedHistoryScreenCoordUAV = EncodedHistoryScreenCoordUAV;
StochasticLightingContext.LumenPackedPixelDataUAV = LumenPackedPixelDataUAV;
StochasticLightingContext.MegaLightsPackedPixelDataUAV = MegaLightsPackedPixelDataUAV;
StochasticLightingContext.OutHistoryScreenParameters = HistoryScreenParameters;
if (Lumen::SupportsMultipleClosureEvaluation(View))
{
if (LumenPackedPixelData && ClosureCount > 1 && bNeedsClear)
{
const uint32 LumenInvalidPackedPixelData = 0x30;
// Initialize LumenPackedPixelData to invalid value for all pixels belonging to slice>0, i.e. closure with index > 0. This is necessary because:
// 1) The classification is dispatched only on valid tiles. For closure>0, the LumenPackedPixelData won't be initialized otherwise
// 2) The temporal reprojection pass uses LumenPackedPixelData to update history value (in particular NumFamesAccumulated), which are used next frame to prune invalid history data.
// Without this, LumenScreenProbeGather will fetch invalid/uninitialized history data for closure>0, causing visual artifacts
FRDGTextureUAVRef LumenPackedPixelDataOverflowUAV = GraphBuilder.CreateUAV(FRDGTextureUAVDesc(LumenPackedPixelData, 0/*InMipLevel*/, LumenPackedPixelData->Desc.Format, 1/*InFirstArraySlice*/, ClosureCount - 1u/*InNumArraySlices*/));
// This value needs to be kept in sync with StochasticLightingCommon.ush
AddClearUAVPass(GraphBuilder, LumenPackedPixelDataOverflowUAV, LumenInvalidPackedPixelData, RunConfig.ComputePassFlags);
bNeedsClear = false;
}
}
StochasticLightingContext.Run(View, ViewPipelineState.ReflectionsMethod, RunConfig);
if (Lumen::SupportsMultipleClosureEvaluation(View))
{
StochasticLighting::FRunConfig OverflowTileRunConfig;
OverflowTileRunConfig.ComputePassFlags = ComputePassFlags;
OverflowTileRunConfig.bSubstrateOverflow = true;
OverflowTileRunConfig.bTileClassifyLumen = LumenTileBitmaskUAV != nullptr;
OverflowTileRunConfig.bReprojectLumen = LumenPackedPixelDataUAV != nullptr;
StochasticLightingContext.Run(View, ViewPipelineState.ReflectionsMethod, OverflowTileRunConfig);
}
}
FrameTemporaries.HistoryScreenParameters.Add(HistoryScreenParameters);
}
}
void FDeferredShadingSceneRenderer::QueueExtractStochasticLighting(FRDGBuilder& GraphBuilder, FLumenSceneFrameTemporaries& FrameTemporaries, const FMinimalSceneTextures& SceneTextures)
{
for (int32 ViewIndex = 0; ViewIndex < Views.Num(); ++ViewIndex)
{
FViewInfo& View = Views[ViewIndex];
if (View.ViewState && !View.bStatePrevViewInfoIsReadOnly)
{
FStochasticLightingViewState& ViewState = View.ViewState->StochasticLighting;
if (FrameTemporaries.DepthHistory.GetRenderTarget())
{
GraphBuilder.QueueTextureExtraction(FrameTemporaries.DepthHistory.GetRenderTarget(), &ViewState.SceneDepthHistory);
}
else
{
ViewState.SceneDepthHistory = nullptr;
}
if (FrameTemporaries.NormalHistory.GetRenderTarget())
{
GraphBuilder.QueueTextureExtraction(FrameTemporaries.NormalHistory.GetRenderTarget(), &ViewState.SceneNormalHistory);
}
else
{
ViewState.SceneNormalHistory = nullptr;
}
ViewState.HistoryScreenPositionScaleBias = View.GetScreenPositionScaleBias(SceneTextures.Config.Extent, View.ViewRect);
const FVector2f InvBufferSize(1.0f / SceneTextures.Config.Extent.X, 1.0f / SceneTextures.Config.Extent.Y);
ViewState.HistoryUVMinMax = FVector4f(
View.ViewRect.Min.X * InvBufferSize.X,
View.ViewRect.Min.Y * InvBufferSize.Y,
View.ViewRect.Max.X * InvBufferSize.X,
View.ViewRect.Max.Y * InvBufferSize.Y);
// Clamp gather4 to a valid bilinear footprint in order to avoid sampling outside of valid bounds.
// Expand the guard band according to encoding precision
float GuardBandSizeX = 0.5f;
float GuardBandSizeY = 0.5f;
{
FVector4f SubPixelGridSizeAndInvSize;
FIntPoint DecodeShift;
StochasticLighting::GetHistoryScreenCoordCodec(SceneTextures.Config.Extent, SubPixelGridSizeAndInvSize, DecodeShift);
GuardBandSizeX += FMath::Max(SubPixelGridSizeAndInvSize.Z, 1.0f / 512.0f);
GuardBandSizeY += FMath::Max(SubPixelGridSizeAndInvSize.W, 1.0f / 512.0f);
}
ViewState.HistoryGatherUVMinMax = FVector4f(
(View.ViewRect.Min.X + GuardBandSizeX) * InvBufferSize.X,
(View.ViewRect.Min.Y + GuardBandSizeY) * InvBufferSize.Y,
(View.ViewRect.Max.X - GuardBandSizeX) * InvBufferSize.X,
(View.ViewRect.Max.Y - GuardBandSizeY) * InvBufferSize.Y);
ViewState.HistoryBufferSizeAndInvSize = FVector4f(
SceneTextures.Config.Extent.X,
SceneTextures.Config.Extent.Y,
1.0f / SceneTextures.Config.Extent.X,
1.0f / SceneTextures.Config.Extent.Y);
}
}
}
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