UnrealEngineUWP/Engine/Shaders/FilterVertexShader.usf

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

/*=============================================================================
	FilterVertexShader.usf: Filter vertex shader source.
=============================================================================*/

#include "Common.usf"

float4 SampleOffsets[(NUM_SAMPLES + 1) / 2];

#if ES2_PROFILE

void Main(
	float4 InPosition : ATTRIBUTE0,
	float2 UV : ATTRIBUTE1,
	out float2 OutUV : TEXCOORD0,
	out float2 OutOffsetUVs[NUM_SAMPLES] : TEXCOORD1,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle( InPosition, UV, OutPosition, UV);

	int SampleIndex;
	for(SampleIndex = 0;SampleIndex < NUM_SAMPLES - 1;SampleIndex += 2)
	{
		half4 OffsetUVUV = SampleOffsets[SampleIndex / 2];
		OutOffsetUVs[ SampleIndex + 0 ] = UV.xy + OffsetUVUV.xy;
		OutOffsetUVs[ SampleIndex + 1 ] = UV.xy + OffsetUVUV.wz;
	}
	if(SampleIndex < NUM_SAMPLES)
	{
		half4 OffsetUVUV = SampleOffsets[SampleIndex / 2];
		OutOffsetUVs[SampleIndex] = UV.xy + OffsetUVUV.xy;
	}

	OutUV = UV;
}

#else

void Main(
	float4 InPosition : ATTRIBUTE0,
	float2 UV : ATTRIBUTE1,
	out float2 OutUV : TEXCOORD0,
	out float4 OutOffsetUVs[(NUM_SAMPLES + 1) / 2] : TEXCOORD1,
	out float4 OutPosition : SV_POSITION
	)
{
	DrawRectangle( InPosition, UV, OutPosition, UV);

	for(int OffsetIndex = 0;OffsetIndex < (NUM_SAMPLES + 1) / 2;OffsetIndex++)
	{
		OutOffsetUVs[OffsetIndex] = UV.xyyx + SampleOffsets[OffsetIndex];
	}

	OutUV = UV;
}

#endif