IndirectLightRendering.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
#pragma once
 
#include "CoreTypes.h"
#include "SceneTextureParameters.h"
#include "ShaderParameterMacros.h"
#include "Substrate/Substrate.h"
 
class FSkyLightSceneProxy;
 
namespace HybridIndirectLighting
{
 
constexpr int32 kInterleavingTileSize = 4;
 
constexpr int32 kInterleavingBucketCount = kInterleavingTileSize * kInterleavingTileSize;
 
constexpr int32 kMaxRayPerPixel = 8;
 
constexpr int32 kMaxTracingResolution = 8192;
 
 
BEGIN_SHADER_PARAMETER_STRUCT(FCommonParameters, )
    // Size of the viewport to do the ray tracing with.
    SHADER_PARAMETER(FIntPoint, TracingViewportSize)
 
    // Standard buffer size to store one viewport.
    SHADER_PARAMETER(FIntPoint, TracingViewportBufferSize)
 
    // 1.0f / TracingViewportBufferSize
    SHADER_PARAMETER(FVector2f, TracingViewportTexelSize)
 
    // How much downscale the ray tracing is done 
    SHADER_PARAMETER(int32, DownscaleFactor)
 
    // Number of ray per pixel.
    SHADER_PARAMETER(int32, RayCountPerPixel)
 
    // Size of the ray storage coordinates.
    // RayCountPerPixel <= (RayStoragePerPixelVector.x * RayStoragePerPixelVector.y) 
    SHADER_PARAMETER(FIntPoint, RayStoragePerPixelVector)
 
    // Bits operator to transfor a tracing PixelRayIndex into ray storage coordinates.
    SHADER_PARAMETER(int32, PixelRayIndexAbscissMask)
    SHADER_PARAMETER(int32, PixelRayIndexOrdinateShift)
 
    // Scene textures and its sampler.
    SHADER_PARAMETER_STRUCT_INCLUDE(FSceneTextureParameters, SceneTextures)
    SHADER_PARAMETER_RDG_UNIFORM_BUFFER(FSubstrateGlobalUniformParameters, Substrate)
END_SHADER_PARAMETER_STRUCT()
 
} // HybridIndirectLighting
 
// Sky light parameters.
BEGIN_SHADER_PARAMETER_STRUCT(FSkyDiffuseLightingParameters, )
    SHADER_PARAMETER(FVector4f, OcclusionTintAndMinOcclusion)
    SHADER_PARAMETER(FVector3f, ContrastAndNormalizeMulAdd)
    SHADER_PARAMETER(float, ApplyBentNormalAO)
    SHADER_PARAMETER(float, InvSkySpecularOcclusionStrength)
    SHADER_PARAMETER(float, OcclusionExponent)
    SHADER_PARAMETER(float, OcclusionCombineMode)
END_SHADER_PARAMETER_STRUCT()
 
FSkyDiffuseLightingParameters GetSkyDiffuseLightingParameters(const FSkyLightSceneProxy* SkyLight, float DynamicBentNormalAO);