ReflectionEnvironmentCapture.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    Functionality for capturing the scene into reflection capture cubemaps, and prefiltering
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "Math/SHMath.h"
#include "RHI.h"
#include "GlobalShader.h"
#include "RenderGraphDefinitions.h"
 
extern void ComputeDiffuseIrradiance(FRDGBuilder& GraphBuilder, FGlobalShaderMap* ShaderMap, FRDGTexture* LightingSource,  FSHVectorRGB3* OutIrradianceEnvironmentMap);
 
FMatrix CalcCubeFaceViewRotationMatrix(ECubeFace Face);
FMatrix GetCubeProjectionMatrix(float HalfFovDeg, float CubeMapSize, float NearPlane);
 
inline uint32 GetNumMips(uint32 MipSize)
{
    return FMath::CeilLogTwo(MipSize) + 1;
}
 
void ConvolveCubeMap(FRDGBuilder& GraphBuilder, FGlobalShaderMap* ShaderMap, uint32 CubeMipStart, uint32 CubeMipEnd, uint32 FaceStart, uint32 FaceCount, FRDGTexture* RDGSrcRenderTarget, FRDGTexture* RDGDstRenderTarget);