#include "common.h"
/*
struct         v2p
{
  float2 tc0:                TEXCOORD0;        // Texture coordinates         (for sampling maps)
  float2 tc1:                TEXCOORD1;        // Texture coordinates         (for sampling maps)
  float2 tc2:                TEXCOORD2;        // Texture coordinates         (for sampling maps)
  float2 tc3:                TEXCOORD3;        // Texture coordinates         (for sampling maps)
};
*/

uniform float4                b_params;

//////////////////////////////////////////////////////////////////////////////////////////
// Pixel
float4 main ( p_build I ) : SV_Target
{
        // hi-rgb.base-lum
//        float3       	s0              =        tex2D           	(s_image,        I.tc0);
//        float3         	s1              =        tex2D       		(s_image,        I.tc1);
//        float3         	s2              =        tex2D       		(s_image,        I.tc2);
//        float3         	s3             	=        tex2D    			(s_image,        I.tc3);
	float3	s0	= s_image.Sample( smp_rtlinear, I.Tex0);
	float3	s1	= s_image.Sample( smp_rtlinear, I.Tex1);
	float3	s2	= s_image.Sample( smp_rtlinear, I.Tex2);
	float3	s3	= s_image.Sample( smp_rtlinear, I.Tex3);


	float3	avg	= ( (s0+s1) + (s2+s3) )/2;
	float	hi	= dot( avg, 1.h )-b_params.x	;	// assume def_hdr equal to 3.0

	return	float4( avg, hi );
}