HairStrandsTransmittance.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
    HairStrandsTransmittance.h: Hair strands transmittance evaluation.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RendererInterface.h"
#include "RenderGraphResources.h"
 
class FLightSceneInfo;
class FViewInfo;
class FVirtualShadowMapArray;
class FVisibleLightInfo;
 
struct FHairStrandsTransmittanceMaskData
{
    static const EPixelFormat Format = PF_R32_UINT;
    FRDGBufferRef TransmittanceMask = nullptr;
};
 
void RenderHairStrandsShadowMask(
    FRDGBuilder& GraphBuilder,
    const TArray<FViewInfo>& Views,
    const FLightSceneInfo* LightSceneInfo,
    const TArrayView<FVisibleLightInfo>& VisibleLightInfos,
    const bool bProjectingForForwardShading,
    FRDGTextureRef ScreenShadowMaskTexture); 
 
void RenderHairStrandsDeepShadowMask(
    FRDGBuilder& GraphBuilder,
    const TArray<FViewInfo>& Views,
    const FLightSceneInfo* LightSceneInfo,
    const TArrayView<FVisibleLightInfo>& VisibleLightInfos,
    FRDGTextureRef OutShadowMask);
 
FHairStrandsTransmittanceMaskData RenderHairStrandsTransmittanceMask(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View, int32 ViewIndex,
    const class FLightSceneInfo* LightSceneInfo,
    const bool bProjectingForForwardShading,
    FRDGTextureRef ScreenShadowMaskSubPixelTexture);
 
FHairStrandsTransmittanceMaskData RenderHairStrandsOnePassTransmittanceMask(
    FRDGBuilder& GraphBuilder,
    const FViewInfo& View, int32 ViewIndex,
    FRDGTextureRef ShadowMaskBits,
    FVirtualShadowMapArray& VirtualShadowMapArray);