LumenRadianceCacheInterpolation.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreMinimal.h"
#include "RendererInterface.h"
#include "RenderGraphResources.h"
 
class FViewInfo;
class FRadianceCacheState;
 
namespace LumenRadianceCache
{
    // Must match RadianceCacheCommon.ush
    static constexpr int32 MaxClipmaps = 6;
 
    static constexpr int32 MinRadianceProbeResolution = 8;
 
    BEGIN_SHADER_PARAMETER_STRUCT(FRadianceCacheInputs, )
        SHADER_PARAMETER(float, ReprojectionRadiusScale)
        SHADER_PARAMETER(float, ClipmapWorldExtent)
        SHADER_PARAMETER(float, ClipmapDistributionBase)
        SHADER_PARAMETER(float, InvClipmapFadeSize)
        SHADER_PARAMETER(float, ProbeTMinScale)
        SHADER_PARAMETER(FIntPoint, ProbeAtlasResolutionInProbes)
        SHADER_PARAMETER(uint32, RadianceProbeClipmapResolution)
        SHADER_PARAMETER(uint32, NumRadianceProbeClipmaps)
        SHADER_PARAMETER(uint32, RadianceProbeResolution)
        SHADER_PARAMETER(uint32, FinalProbeResolution)
        SHADER_PARAMETER(uint32, FinalRadianceAtlasMaxMip)
        SHADER_PARAMETER(uint32, CalculateIrradiance)
        SHADER_PARAMETER(uint32, UseSkyVisibility)
        SHADER_PARAMETER(uint32, IrradianceProbeResolution)
        SHADER_PARAMETER(uint32, OcclusionProbeResolution)
        SHADER_PARAMETER(uint32, NumProbesToTraceBudget)
        SHADER_PARAMETER(uint32, RadianceCacheStats)
    END_SHADER_PARAMETER_STRUCT()
 
    FRadianceCacheInputs GetDefaultRadianceCacheInputs();
 
    BEGIN_SHADER_PARAMETER_STRUCT(FRadianceCacheInterpolationParameters, )
        SHADER_PARAMETER_STRUCT_INCLUDE(FRadianceCacheInputs, RadianceCacheInputs)
        SHADER_PARAMETER_RDG_TEXTURE(Texture3D<uint>, RadianceProbeIndirectionTexture)
        SHADER_PARAMETER_RDG_TEXTURE(Texture2D<float3>, RadianceCacheFinalRadianceAtlas)
        SHADER_PARAMETER_RDG_TEXTURE(Texture2D<float>, RadianceCacheFinalSkyVisibilityAtlas)
        SHADER_PARAMETER_RDG_TEXTURE(Texture2D<float3>, RadianceCacheFinalIrradianceAtlas)
        SHADER_PARAMETER_RDG_TEXTURE(Texture2D<float2>, RadianceCacheProbeOcclusionAtlas)
        SHADER_PARAMETER_RDG_TEXTURE(Texture2D<float>, RadianceCacheDepthAtlas)
        SHADER_PARAMETER_RDG_BUFFER_SRV(StructuredBuffer<float4>, ProbeWorldOffset)
        SHADER_PARAMETER_ARRAY(FVector4f, RadianceProbeSettings, [MaxClipmaps])
        SHADER_PARAMETER_ARRAY(FVector4f, ClipmapCornerTWSAndCellSize, [MaxClipmaps])
        SHADER_PARAMETER(FVector2f, InvProbeFinalRadianceAtlasResolution)
        SHADER_PARAMETER(FVector2f, InvProbeFinalIrradianceAtlasResolution)
        SHADER_PARAMETER(FVector2f, InvProbeDepthAtlasResolution)
        SHADER_PARAMETER(float, RadianceCacheOneOverCachedLightingPreExposure)
        SHADER_PARAMETER(uint32, OverrideCacheOcclusionLighting)
        SHADER_PARAMETER(uint32, ShowBlackRadianceCacheLighting)
        SHADER_PARAMETER(uint32, ProbeAtlasResolutionModuloMask)
        SHADER_PARAMETER(uint32, ProbeAtlasResolutionDivideShift)
    END_SHADER_PARAMETER_STRUCT()
 
    // Packed in vector to satisfy 16 byte array element alignment :
    // X=RadianceProbeClipmapTMin, Y=WorldPositionToRadianceProbeCoordScale, Z=RadianceProbeCoordToWorldPositionScale, W=[available]
    // Must match with LumenRadianceCacheInterpolation.ush
    inline void SetRadianceProbeClipmapTMin(FRadianceCacheInterpolationParameters& RadianceCacheInterpolationParameters, uint32 Index, float Value)
    {
        RadianceCacheInterpolationParameters.RadianceProbeSettings[Index].X = Value;
    }
    inline void SetClipmapCornerTWS(FRadianceCacheInterpolationParameters& RadianceCacheInterpolationParameters, uint32 Index, FVector3f Corner)
    {
        RadianceCacheInterpolationParameters.ClipmapCornerTWSAndCellSize[Index].X = Corner.X;
        RadianceCacheInterpolationParameters.ClipmapCornerTWSAndCellSize[Index].Y = Corner.Y;
        RadianceCacheInterpolationParameters.ClipmapCornerTWSAndCellSize[Index].Z = Corner.Z;
    }
    inline void SetClipmapCellSize(FRadianceCacheInterpolationParameters& RadianceCacheInterpolationParameters, uint32 Index, float CellSize)
    {
        RadianceCacheInterpolationParameters.ClipmapCornerTWSAndCellSize[Index].W = CellSize;
    }
 
    void GetInterpolationParameters(
        const FViewInfo& View, 
        FRDGBuilder& GraphBuilder, 
        const FRadianceCacheState& RadianceCacheState,
        const LumenRadianceCache::FRadianceCacheInputs& RadianceCacheInputs,
        FRadianceCacheInterpolationParameters& OutParameters);
};