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

#include "/Engine/Shared/MaterialCacheDefinitions.h"
#include "/Engine/Private/Common.ush"
#include "/Engine/Public/RootConstants.ush"
#include "/Engine/Private/MaterialCache/MaterialCacheCommon.ush"
#include "/Engine/Private/MaterialCache/MaterialCacheABuffer.ush"
 
#define SceneTexturesStruct MaterialCachePass.SceneTextures 

#include "/Engine/Generated/Material.ush"
#include "/Engine/Generated/VertexFactory.ush"
#include "/Engine/Generated/UniformBuffers/MaterialCachePass.ush"
#include "/Engine/Private/MaterialCache/MaterialCacheShadeCommon.ush"

struct FMaterialCacheInterpolantsVSToPS
{

};

void Main(
	FVertexFactoryInterpolantsVSToPS Interpolants,
	FMaterialCacheInterpolantsVSToPS PassInterpolants,
	in INPUT_POSITION_QUALIFIERS float4 SvPosition : SV_Position
	OPTIONAL_IsFrontFace
)
{
	const uint PageIndex = GetRootConstant0();
	
	const EMaterialCacheFlag    Flags   = (EMaterialCacheFlag)GetRootConstant2();
	const FMaterialCacheBinData BinData = GetMaterialCacheShadingData(PageIndex);
	
	const uint2 PagePixelPos = uint2(SvPosition.xy) & MaterialCachePass.SvPagePositionModMask;
	
	ResolvedView = ResolveView();
	
	FMaterialPixelParameters MaterialParameters = GetMaterialPixelParameters(Interpolants, SvPosition);

	const float4 ScreenPosition          = SvPositionToResolvedScreenPosition(SvPosition);
	const float3 TranslatedWorldPosition = SvPositionToResolvedTranslatedWorld(SvPosition);
	
	FPixelMaterialInputs PixelMaterialInputs;
	CalcMaterialParametersEx(MaterialParameters, PixelMaterialInputs, SvPosition, ScreenPosition, bIsFrontFace, TranslatedWorldPosition, TranslatedWorldPosition);

	FMaterialCacheABuffer Top = GetMaterialABuffer(MaterialParameters, PixelMaterialInputs);
	clip(Top.Clipped ? -1 : 1);

	StoreMaterialABufferPixel(Top, Flags, BinData.ABufferPhysicalPosition, PagePixelPos);
}