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

/*=============================================================================
	UpdateTextureShaders.usf: Compute shaders for copying and updating textures.
=============================================================================*/

#include "Common.usf"

Buffer<int4> SrcBuffer;
RWTexture2D<int4> DestTexture;
int SrcPitch;

uint4 DestPosSize; // xy = pos, zw = Size of the destination sub rect

[numthreads(8,8,1)]
void UpdateTexture2DSubresourceCS( uint2 ThreadId : SV_DispatchThreadID )
{
	if( all( ThreadId.xy < DestPosSize.zw ) )
	{
		DestTexture[ ThreadId.xy + DestPosSize.xy ] = SrcBuffer[ ThreadId.x + ThreadId.y * SrcPitch ];
	}
}

Texture2D<int4> SrcTexture;

[numthreads(8,8,1)]
void CopyTexture2DCS( uint3 ThreadId : SV_DispatchThreadID )
{
	DestTexture[ ThreadId.xy ] = SrcTexture.Load( int3( ThreadId.x, ThreadId.y, 0 ) );
}