#include "common.h"

struct v2p
{
	float2 tc0	: TEXCOORD0;
	float4 c	: COLOR0;

//	Igor: for additional depth dest
#ifdef	USE_SOFT_PARTICLES
	float4 tctexgen	: TEXCOORD1;
#endif	//	USE_SOFT_PARTICLES

	float4 hpos	: SV_Position;
};


//	Must be less than view near
#define	DEPTH_EPSILON	0.1h
//////////////////////////////////////////////////////////////////////////////////////////
// Pixel
float4 main( v2p I ) : SV_Target
{
//	float4 result = I.c*tex2D	(s_base,I.tc0);
	float4 result = I.c * s_base.Sample( smp_base, I.tc0);

	//	Igor: additional depth test
#ifdef	USE_SOFT_PARTICLES
//	float4 _P		= tex2Dproj         (s_position,         I.tctexgen);
	float2 tcProj	= I.tctexgen.xy / I.tctexgen.w;
#ifdef GBUFFER_OPTIMIZATION
	gbuffer_data gbd = gbuffer_load_data( tcProj, I.hpos );
#else
	gbuffer_data gbd = gbuffer_load_data( tcProj );
#endif
	float4 _P		= float4( gbd.P, gbd.mtl );
	float spaceDepth = _P.z-I.tctexgen.z-DEPTH_EPSILON;
	if (spaceDepth < -2*DEPTH_EPSILON ) spaceDepth = 100000.0h; //  Skybox doesn't draw into position buffer
	//result.a *= saturate(spaceDepth*0.3h);
	result.a *= Contrast( saturate(spaceDepth*1.3h), 2);
	result.rgb *= Contrast( saturate(spaceDepth*1.3h), 2);
//	result = Contrast( saturate(spaceDepth*1.3h), 2);
//	result = saturate (spaceDepth*5.0);
//	result.rgb = float3(1,0,0);
//	result.a = 1;
#endif	//	USE_SOFT_PARTICLES

	clip(result.a-(0.01f/255.0f));
	//clip(result.a-0.5);

	return	result;
}