//========== Copyright (c) Valve Corporation, All rights reserved. ==========//

#include "common_vs_fxc.h"

float4 uvTransform : register ( SHADER_SPECIFIC_CONST_0 );
float4 uvTransform_UpperLeftLowerRight : register ( SHADER_SPECIFIC_CONST_1 );

struct VS_INPUT
{
	float3 vPos				: POSITION;
	float2 vBaseTexCoord	: TEXCOORD0;
};

struct VS_OUTPUT
{
    float4 projPos			: POSITION;	
	float4 bloombaseCoords	: TEXCOORD0;
	float4 fxaaCoords		: TEXCOORD1;
};

float2 PerformUVTransform( float2 uv )
{
	return uv * uvTransform.zw + uvTransform.xy;
}

float4 PerformUVTransform_UpperLeftLowerRight( float2 uv )
{
	
	return uv.xyxy + uvTransform_UpperLeftLowerRight.xyzw; 
}

VS_OUTPUT main( const VS_INPUT v )
{
	VS_OUTPUT o;

	o.projPos = float4( v.vPos, 1.0f );

#ifdef _PS3
	// Account for OpenGL's flipped y coordinate and expanded z range [-1,1] instead of [0,1]
	o.projPos.y = -o.projPos.y;
	o.projPos.z = 2.0f * o.projPos.z - o.projPos.w;
#endif // _PS3

//	o.baseCoords.xy = v.vBaseTexCoord.xy;
//	o.bloomCoords.xy = PerformUVTransform( v.vBaseTexCoord.xy ); // Compute bloom tex coords

	o.bloombaseCoords.zw = v.vBaseTexCoord.xy;
	o.bloombaseCoords.xy = PerformUVTransform( v.vBaseTexCoord.xy ); // Compute bloom tex coords

	// extra fxaa coords
    // {xy__} = upper left of pixel
    // {__zw} = lower right of pixel
	o.fxaaCoords.xyzw = PerformUVTransform_UpperLeftLowerRight( o.bloombaseCoords.xy ); // Compute upper left, lower right tex coords

	return o;
}