#include "common.h"

#ifdef ISAMPLE
#	undef ISAMPLE
#endif // #ifdef ISAMPLE

#define ISAMPLE 0

uniform float3x4	m_v2w;

struct	_input
{
	float4	tc0		: TEXCOORD0;	// tc.xy, tc.w = tonemap scale
	float2	tcJ		: TEXCOORD1;	// jitter coords
	float4	pos2d	: SV_Position;
};

float4 main ( _input I ) : SV_Target0
{
	//gbuffer_data gbd = gbuffer_load_data( GLD_P(I.tc0.xy, I.pos2d * 2, ISAMPLE) );
	//	gbuffer_data gbd = gbuffer_load_data( GLD_P(I.tc0.xy + 0.5f / pos_decompression_params2.xy, I.pos2d * 2, ISAMPLE) );
	//	TODO: move it to C++ code to save maths in PS
	//	??? Why we move x and y in the same direction???
	gbuffer_data gbd0 = gbuffer_load_data( GLD_P(I.tc0.xy + 0.5f * pos_decompression_params2.zw, I.pos2d * 2, ISAMPLE) );
	gbuffer_data gbd1 = gbuffer_load_data( GLD_P(I.tc0.xy - 0.5f * pos_decompression_params2.zw, I.pos2d * 2, ISAMPLE) );
	gbuffer_data gbd2 = gbuffer_load_data( GLD_P(I.tc0.xy + 0.5f * float2(+pos_decompression_params2.z, -pos_decompression_params2.w), I.pos2d * 2, ISAMPLE) );
	gbuffer_data gbd3 = gbuffer_load_data( GLD_P(I.tc0.xy + 0.5f * float2(-pos_decompression_params2.z, +pos_decompression_params2.w), I.pos2d * 2, ISAMPLE) );

	gbuffer_data gbd = gbd0;
	if (gbd1.P.z < gbd.P.z) gbd = gbd1;	
	if (gbd2.P.z < gbd.P.z) gbd = gbd2;	
	if (gbd3.P.z < gbd.P.z) gbd = gbd3;

//	gbd.P.z = (gbd0.P.z + gbd1.P.z + gbd2.P.z + gbd3.P.z)  * 0.25f;

	float4	P = float4( gbd.P, gbd.mtl );	// position.(mtl or sun)

//	SSAO_OPT_DATA == 2	for half-res data
//	SSAO_OPT_DATA == 1	for full-res data

#ifndef HDAO // AMDs hdao turned off
#if SSAO_OPT_DATA == 2	
	return  float4(P.zzzz);
#else	//	SSAO_OPT_DATA == 2
	gbd = gbuffer_load_data( GLD_P(I.tc0.xy, I.pos2d, ISAMPLE) );
	return  float4(gbd.P.zzzz);
#endif	//	SSAO_OPT_DATA == 2
#else // HDAO
#if SSAO_OPT_DATA == 2	
	return  float4(P.zzzz + g_fHDAOZDispScale * gbd.N.zzzz );
#else	//	SSAO_OPT_DATA == 2
//	gbd = gbuffer_load_data( GLD_P(I.tc0.xy, I.pos2d, ISAMPLE) );
//	return  float4(gbd.P.zzzz + g_fHDAOZDispScale * gbd.N.zzzz);
	return	float4(0,0,0,1);
#endif	//	SSAO_OPT_DATA == 2
#endif // HDAO
}