Engine/Shaders/FilterPixelShader.usf

/*=============================================================================
	FilterPixelShader.usf: Filter pixel shader source.
	Copyright 1998-2008 Epic Games, Inc. All Rights Reserved.
=============================================================================*/

#include "Common.usf"

sampler2D FilterTexture;
half4 SampleWeights[NUM_SAMPLES];

void Main(
	float4 InOffsetUVs[(NUM_SAMPLES + 1) / 2] : TEXCOORD0,
	out float4 OutColor : COLOR0
	)
{
	int SampleIndex;
	half4 Sum = 0;
	for(SampleIndex = 0;SampleIndex < NUM_SAMPLES - 1;SampleIndex += 2)
	{
		Sum += tex2D(FilterTexture,InOffsetUVs[SampleIndex / 2].xy) * SampleWeights[SampleIndex + 0];
		Sum += tex2D(FilterTexture,InOffsetUVs[SampleIndex / 2].wz) * SampleWeights[SampleIndex + 1];
	}
	if(SampleIndex < NUM_SAMPLES)
	{
		Sum += tex2D(FilterTexture,InOffsetUVs[SampleIndex / 2].xy) * SampleWeights[SampleIndex + 0];
	}
	// RETURN_COLOR not needed unless writing to SceneColor;
	OutColor = Sum;
}