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

// Check Screen Space Shaders modules & addons
#include "check_screenspace.h"

#ifdef SSFX_SSS
	#include "screenspace_shadows.h"
#endif

#ifdef USE_MINMAX_SM
#define SM_MINMAX
#endif

#if SUN_QUALITY>2
#define ULTRA_SHADOWS_ON
#endif //	SUN_QUALITY>2

#ifdef ULTRA_SHADOWS_ON
#define USE_ULTRA_SHADOWS
#endif

#include "shadow.h"

uniform float3 view_shadow_proj; // Unused

#ifdef USE_SUNFILTER
#ifdef MSAA_OPTIMIZATION
float4 main ( v2p_volume I, uint iSample : SV_SAMPLEINDEX  ) : SV_Target
#else
float4 main ( v2p_volume I  ) : SV_Target
#endif
{
	gbuffer_data gbd = gbuffer_load_data( GLD_P(I.tc, I.hpos, ISAMPLE) );

	float4 _P = float4( gbd.P, 1.0);

	float4 PS = mul( m_shadow,  _P );

	float s	= shadowtest_sun( PS, I.tcJ ) * sunmask( _P );

	return s;
}
#else
#ifdef MSAA_OPTIMIZATION
float4 main ( v2p_volume I,  uint iSample : SV_SAMPLEINDEX ) : SV_Target
#else
float4 main ( v2p_volume I ) : SV_Target
#endif
{
	gbuffer_data gbd = gbuffer_load_data( GLD_P(I.tc.xy/I.tc.w, I.hpos, ISAMPLE) );

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

	// ----- shadow

	// SHADOWS FIXES - SSS Update 19
	// Normal Offset for biasing
	float3 NormalOffset = 0;
#ifdef SSFX_SHADOWS
	NormalOffset = _N * ssfx_shadow_bias.y;
#endif

  	float4 	P4 	= float4( _P.xyz + NormalOffset, 1.0);
	float4 	PS	= mul( m_shadow, P4 );
	
	// SHADOWS FIXES - SSS Update 14.7
	// New far edge fading code
	float s = shadow( PS ); // Far Shadows
	float shadows = sunmask( P4 ); // Clouds. Don't fade clouds.

	// Fade UV
	float2 FadeUV = PS.xy / PS.w;

	// Fade calc
	float4 fade = smoothstep(0.0f, 0.1f, float4(FadeUV.x, 1.0f - FadeUV.x, FadeUV.y, 1.0f - FadeUV.y));
	float f = fade.x * fade.y * fade.z * fade.w;
	s += ( 1.0f - s ) * ( 1.0f - f );

#ifdef SSFX_SSS
	s *= SSFX_ScreenSpaceShadows_Far(_P, I.hpos, ISAMPLE);
#endif

	// Add Shadows
	shadows *= s;

#ifdef SSFX_ENHANCED_SHADERS
	return blend( float4( SRGBToLinear( Ldynamic_color.rgb * shadows.xxx ), 1.0f ) * light, I.tc );
#else
	return blend( Ldynamic_color * light * shadows, I.tc );
#endif
}
#endif