#include "common.h"
#include "lmodel.h"
#include "shadow.h"

//////////////////////////////////////////////////////////////////////////////////////////
// This is the basic primitive used by convex, volumetric lights
// for example spot-lights, one face of the omni lights, etc.
//////////////////////////////////////////////////////////////////////////////////////////
// following options are available to configure compilation:
// USE_LMAP
// USE_LMAPXFORM
// USE_SHADOW
//////////////////////////////////////////////////////////////////////////////////////////
uniform float4              m_lmap        [2]        ;
//float4 main( float4 tc : TEXCOORD0, float4 tcJ : TEXCOORD1 ) : SV_Target
#ifdef MSAA_OPTIMIZATION
#ifdef GBUFFER_OPTIMIZATION
float4 main( p_volume I, float4 pos2d : SV_Position, uint iSample : SV_SAMPLEINDEX ) : SV_Target
#else
float4 main( p_volume I, uint iSample : SV_SAMPLEINDEX  ) : SV_Target
#endif
#else
#ifdef GBUFFER_OPTIMIZATION
float4 main( p_volume I, float4 pos2d : SV_Position ) : SV_Target
#else
float4 main( p_volume I ) : SV_Target
#endif
#endif
{
//	float4 _P               = tex2Dproj         (s_position,         tc);
//	float4  _N               = tex2Dproj         (s_normal,           tc);

	float2	tcProj			= I.tc.xy / I.tc.w;

	gbuffer_data gbd = gbuffer_load_data( GLD_P(tcProj, pos2d, ISAMPLE) );

#ifdef	GBUFFER_OPTIMIZATION
	//	Emulate virtual offset
	gbd.P += gbd.N*0.015f;
#endif	//	GBUFFER_OPTIMIZATION

	float4 _P				= float4( gbd.P, gbd.mtl );
	float4 _N				= float4( gbd.N, gbd.hemi );

	float 	m	= xmaterial	;
# ifndef USE_R2_STATIC_SUN
			m 	= _P.w		;
# endif
        // ----- light-model
      	float        		rsqr;
        float4        		light   = plight_local( m, _P, _N, Ldynamic_pos, Ldynamic_pos.w, rsqr );

        // ----- shadow
		float4          		P4      = float4( _P.x, _P.y, _P.z, 1);
        float4         		PS      = mul( m_shadow, P4 );
        float         		s		= 1.h;
        #ifdef  USE_SHADOW
                #ifdef         USE_SJITTER
							s		= shadowtest( PS, I.tcJ );
                #else
							s		= shadow( PS );
                #endif
        #endif

        // ----- lightmap
        float4         lightmap= 1.h;
        #ifdef        USE_LMAP
                #ifdef         USE_LMAPXFORM
							PS.x	= dot( P4, m_lmap[0] );
							PS.y	= dot( P4, m_lmap[1] );
                #endif
                //lightmap= tex2Dproj         (s_lmap,        PS);        //
				//	Can use linear with mip point
				lightmap 			= s_lmap.Sample( smp_rtlinear, PS.xy / PS.w );        //
        #endif

        return blendp ( Ldynamic_color * light * s * lightmap, I.tc );
}