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

// Check Screen Space Shaders modules & addons
#include "check_screenspace.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
//////////////////////////////////////////////////////////////////////////////////////////
float4 m_lmap[2];

#ifdef MSAA_OPTIMIZATION
float4 main(p_volume I, float4 pos2d : SV_Position, uint iSample : SV_SAMPLEINDEX  ) : SV_Target
#else
float4 main(p_volume I, float4 pos2d : SV_Position ) : SV_Target
#endif
{
	float2	tcProj = I.tc.xy / I.tc.w;

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

	float4 _P = float4(gbd.P, gbd.mtl );
	float4 _N = float4(gbd.N, gbd.hemi );
	float4 _C = float4(gbd.C, gbd.gloss );
	
	float m = xmaterial	;
#ifndef USE_R2_STATIC_SUN
			m = _P.w;
#endif

	// FLORA FIXES & IMPROVEMENTS - SSS Update 14.2
	// Fix Flora ilumination ( Align normal to light )
#ifdef SSFX_FLORAFIX
	if(abs(m - MAT_FLORA) <= 0.05)
	{
		_N.rgb = -normalize(_P - Ldynamic_pos.xyz);
		_C.w *= 0.3f;
	}
#endif

	// ----- light-model
	float rsqr;
	float4 light = plight_local(m, _P, _N, _C, Ldynamic_pos, Ldynamic_pos.w, rsqr );

	// ----- shadow

	float3 Offset = 0;
#ifdef SSFX_SHADOWS
	// Biasing ( Use the nDotL from plight_local... )
	float bias_int = (1.0 - saturate(dot(_N, -normalize(_P - Ldynamic_pos.xyz)))) * rsqr * Ldynamic_pos.w;
	Offset = _N * (0.025f + bias_int * ssfx_shadow_bias.x);
#endif

	float4 P4 = float4(_P.xyz + Offset, 1);
	float4 PS = mul(m_shadow, P4 );

	float s = 1.h;
	#ifdef  USE_SHADOW
		s = shadow( PS );
	#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

		//	Can use linear with mip point
		lightmap = s_lmap.SampleLevel(smp_rtlinear, PS.xy / PS.w, 0 );
	#endif

#ifdef SSFX_ENHANCED_SHADERS
		return  float4(SRGBToLinear(Ldynamic_color.rgb * lightmap.rgb * s.xxx),1) * light;
#else
		return  float4( Ldynamic_color * light * s * lightmap);
#endif
}