UnrealEngineUWP/Engine/Shaders/ClearReplacementShaders.usf

// Copyright 1998-2014 Epic Games, Inc. All Rights Reserved.

/*=============================================================================
	ClearReplacement.usf: Collection of Shaders for alternative ways to clear a texture/buffer.
=============================================================================*/

#include "Common.usf"

float4 ClearColor;

float4 ClearVS(uint Id : SV_VertexID) : SV_POSITION
{
	int x = Id &  1;
	int y = Id >> 1;

	return float4(x * 2 - 1, y * 2 - 1, 0, 1);
}


float4 ClearPS() : SV_Target0
{
	return ClearColor;
}

#if FEATURE_LEVEL >= FEATURE_LEVEL_SM5
RWTexture2D<float4> ClearTextureRW;

[numthreads(8,8,1)]
void ClearTexture2DCS(uint2 Position : SV_DispatchThreadID)
{
	ClearTextureRW[Position] = ClearColor;
}


uint ClearDword;
RWBuffer<uint> ClearBufferRW;

[numthreads(64,1,1)]
void ClearBufferCS(uint Position : SV_DispatchThreadID)
{
	ClearBufferRW[Position] = ClearDword;
}
#endif