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

#include "common_ps_fxc.h"

sampler TexSampler0	: register( s0 );
sampler TexSampler1	: register( s1 );
sampler TexSampler2	: register( s2 );
sampler TexSampler3	: register( s3 );

struct PS_INPUT
{
	float2 texCoord	: TEXCOORD0;
};

const float4 weights : register( c0 );

float4 main( PS_INPUT i ) : COLOR
{
	// Just sample the four input textures
	float4 sample0 = tex2D( TexSampler0, i.texCoord );
	float4 sample1 = tex2D( TexSampler1, i.texCoord );
	float4 sample2 = tex2D( TexSampler2, i.texCoord );
	float4 sample3 = tex2D( TexSampler3, i.texCoord );

	// Compute weighted average and return
	return weights.x * sample0 + weights.y * sample1 + weights.z * sample2 + weights.w * sample3;
}