// Copyright Epic Games, Inc. All Rights Reserved.

#define USE_HAIR_COMPLEX_TRANSMITTANCE 1

#include "../Common.ush"
#include "../Lumen/LumenMaterial.ush"
#include "StochasticLightingCommon.ush"

RWTexture2D<float> RWDepthTexture;
RWTexture2D<float4> RWNormalTexture;

/**
 * Copy depth and normal for opaque before it gets overwritten by water or other translucency writing depth
 */
[numthreads(THREADGROUP_SIZE, THREADGROUP_SIZE, 1)]
void StoreSceneHistoryCS(
	uint2 DispatchThreadId : SV_DispatchThreadID)
{
	uint2 ScreenCoord = DispatchThreadId + View.ViewRectMinAndSize.xy;
	FLumenMaterialData LumenMaterial = ReadMaterialData(ScreenCoord);

	RWDepthTexture[DispatchThreadId + View.ViewRectMinAndSize.xy] = ConvertToDeviceZ(LumenMaterial.SceneDepth);

	#if PERMUTATION_STORE_NORMAL
	{
		FNormalAndShadingInfo Info;
		Info.Normal = LumenMaterial.WorldNormal;
		Info.bIsHair = LumenMaterial.bIsHair;
		Info.bHasBackfaceDiffuse = LumenMaterial.bHasBackfaceDiffuse;
		RWNormalTexture[DispatchThreadId + View.ViewRectMinAndSize.xy] = PackNormalAndShadingInfo(Info);
	}
	#endif
}