StochasticLighting.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "RenderGraphFwd.h"
#include "Lumen/LumenFrontLayerTranslucency.h"
 
class FViewInfo;
class FSceneViewState;
struct FMinimalSceneTextures;
enum class EReflectionsMethod;
 
namespace StochasticLighting
{
    enum class EMaterialSource
    {
        GBuffer,
        FrontLayerGBuffer,
        HairStrands,
        MAX
    };
 
    enum class EStochasticSampleOffset
    {
        None,
        DownsampleFactor2x1,
        DownsampleFactor2x2,
        Both,
        MAX
    };
 
    int32 GetStateFrameIndex(const FSceneViewState* ViewState);
 
    bool IsStateFrameIndexOverridden();
 
    struct FRunConfig
    {
        ERDGPassFlags ComputePassFlags = ERDGPassFlags::Compute;
        int32 StateFrameIndexOverride = -1;
        bool bSubstrateOverflow = false;
        bool bCopyDepthAndNormal = false;
        bool bDownsampleDepthAndNormal2x1 = false;
        bool bDownsampleDepthAndNormal2x2 = false;
        bool bTileClassifyLumen = false;
        bool bTileClassifyMegaLights = false;
        bool bTileClassifySubstrate = false;
        bool bReprojectLumen = false;
        bool bReprojectMegaLights = false;
    };
 
    struct FContext
    {
        FRDGBuilder& GraphBuilder;
        const FMinimalSceneTextures& SceneTextures;
        const FLumenFrontLayerTranslucencyGBufferParameters& FrontLayerTranslucencyGBuffer;
        StochasticLighting::EMaterialSource MaterialSource;
        FRDGTextureUAVRef DepthHistoryUAV = nullptr;
        FRDGTextureUAVRef NormalHistoryUAV = nullptr;
        FRDGTextureUAVRef DownsampledSceneDepth2x1UAV = nullptr;
        FRDGTextureUAVRef DownsampledWorldNormal2x1UAV = nullptr;
        FRDGTextureUAVRef DownsampledSceneDepth2x2UAV = nullptr;
        FRDGTextureUAVRef DownsampledWorldNormal2x2UAV = nullptr;
        FRDGTextureUAVRef LumenTileBitmaskUAV = nullptr;
        FRDGTextureUAVRef MegaLightsTileBitmaskUAV = nullptr;
        FRDGTextureUAVRef EncodedReprojectionVectorUAV = nullptr;
        FRDGTextureUAVRef LumenPackedPixelDataUAV = nullptr;
        FRDGTextureUAVRef MegaLightsPackedPixelDataUAV = nullptr;
 
        FContext(
            FRDGBuilder& InGraphBuilder,
            const FMinimalSceneTextures& InSceneTextures,
            const FLumenFrontLayerTranslucencyGBufferParameters& InFrontLayerTranslucencyGBuffer,
            StochasticLighting::EMaterialSource InMaterialSource);
 
        void Validate(const FRunConfig& RunConfig) const;
 
        void Run(const FViewInfo& View, EReflectionsMethod ViewReflectionsMethod, const FRunConfig& RunConfig);
    };
}