LNXSDK/leenkx/Shaders/std/light_mobile.glsl

#ifndef _LIGHT_MOBILE_GLSL_
#define _LIGHT_MOBILE_GLSL_

#include "compiled.inc"
#include "std/brdf.glsl"
#ifdef _ShadowMap
#include "std/shadows.glsl"
#endif
#ifdef _Spot
#include "std/light_common.glsl"
#endif

#ifdef _ShadowMap
	#ifdef _SinglePoint
		#ifdef _Spot
		uniform sampler2DShadow shadowMapSpot[1];
		uniform mat4 LWVPSpotArray[1];
		#else
		uniform samplerCubeShadow shadowMapPoint[1];
		uniform vec2 lightProj;
		#endif
	#endif
	#ifdef _Clusters
		#ifdef _SingleAtlas
		//!uniform sampler2DShadow shadowMapAtlas;
		#endif
		#ifndef _SinglePoint
		uniform vec2 lightProj;
		#endif
		#ifdef _ShadowMapAtlas
		#ifndef _SingleAtlas
		uniform sampler2DShadow shadowMapAtlasPoint;
		#endif
		#else
		uniform samplerCubeShadow shadowMapPoint[4];
		#endif
		#ifdef _Spot
			#ifdef _ShadowMapAtlas
			#ifndef _SingleAtlas
			uniform sampler2DShadow shadowMapAtlasSpot;
			#endif
			#else
			uniform sampler2DShadow shadowMapSpot[maxLightsCluster];
			#endif
			uniform mat4 LWVPSpotArray[maxLightsCluster];
		#endif
	#endif
#endif

vec3 sampleLight(const vec3 p, const vec3 n, const vec3 v, const float dotNV, const vec3 lp, const vec3 lightCol,
	const vec3 albedo, const float rough, const float spec, const vec3 f0
	#ifdef _ShadowMap
		, int index, float bias, bool receiveShadow
	#endif
	#ifdef _Spot
		, bool isSpot, float spotSize, float spotBlend, vec3 spotDir, vec2 scale, vec3 right
	#endif
	#ifdef _ClearCoat
		, float clearcoat, float clearcoatRough, float coatIOR, vec3 coatTint, vec3 coatN
	#endif
	#ifdef _Sheen
		, float sheen, float sheenRough, vec3 sheenTint
	#endif
	#ifdef _Anisotropy
		, float anisotropy, float anisoRot, vec3 tangent
	#endif
	#ifdef _SSS
		, float subsurface, vec3 sssColor, vec3 sssRadius, float sssAnisotropy
	#endif
	#ifdef _Transmission
		, float transmission, float transRough, float ior, float thinWall
	#endif
	) {
	vec3 ld = lp - p;
	float dist = length(ld);
	vec3 l = ld / dist;
	vec3 h = normalize(v + l);
	float dotNH = max(0.0, dot(n, h));
	float dotVH = max(0.0, dot(v, h));
	float dotNL = max(0.0, dot(n, l));

	#ifdef _Anisotropy
	vec3 direct;
	if (abs(anisotropy) > 0.001 && dot(tangent, tangent) > 0.001) {
		vec3 bitangent = normalize(cross(n, tangent));
		direct = lambertDiffuseBRDF(albedo, dotNL) +
			anisotropicBRDF(f0, rough, anisotropy, anisoRot,
				tangent, bitangent, n, l, v, dotNL, dotNV) * spec;
	} else {
		direct = lambertDiffuseBRDF(albedo, dotNL) +
			specularBRDF(f0, rough, dotNL, dotNH, dotNV, dotVH) * spec;
	}
	#else
	vec3 direct = lambertDiffuseBRDF(albedo, dotNL) +
				  specularBRDF(f0, rough, dotNL, dotNH, dotNV, dotVH) * spec;
	#endif

	#ifdef _ExtBRDF
	float layerWeight;
	direct = applyExtBRDFLayers(direct, albedo, f0, rough, dotNL, dotNV, dotNH, dotVH, n, l, v, h
		#ifdef _ClearCoat
		, clearcoat, clearcoatRough, coatIOR, coatTint, coatN
		#endif
		#ifdef _Sheen
		, sheen, sheenRough, sheenTint
		#endif
		#ifdef _Transmission
		, transmission, transRough, ior, thinWall
		#endif
		, layerWeight
	);
	#endif

	direct *= lightCol;
	direct *= attenuate(dist);

	#ifdef _Spot
	if (isSpot) {
		direct *= spotlightMask(l, spotDir, right, scale, spotSize, spotBlend);

		#ifdef _ShadowMap
			if (receiveShadow) {
				#ifdef _SinglePoint
				vec4 lPos = LWVPSpotArray[0] * vec4(p + n * bias * 10, 1.0);
				direct *= shadowTest(shadowMapSpot[0], lPos.xyz / lPos.w, bias);
				#endif
				#ifdef _Clusters
					vec4 lPos = LWVPSpotArray[index] * vec4(p + n * bias * 10, 1.0);
					#ifdef _ShadowMapAtlas
						tileBounds = tileBoundsSpotArray[index];
						direct *= shadowTest(
							#ifndef _SingleAtlas
							shadowMapAtlasSpot
							#else
							shadowMapAtlas
							#endif
							, lPos.xyz / lPos.w, bias
						);
					#else
							 if (index == 0) direct *= shadowTest(shadowMapSpot[0], lPos.xyz / lPos.w, bias);
						else if (index == 1) direct *= shadowTest(shadowMapSpot[1], lPos.xyz / lPos.w, bias);
						else if (index == 2) direct *= shadowTest(shadowMapSpot[2], lPos.xyz / lPos.w, bias);
						else if (index == 3) direct *= shadowTest(shadowMapSpot[3], lPos.xyz / lPos.w, bias);
					#endif
				#endif
			}
		#endif
		return direct;
	}
	#endif

	#ifdef _ShadowMap

		if (receiveShadow) {
			#ifdef _SinglePoint
			#ifndef _Spot
			direct *= PCFCube(shadowMapPoint[0], ld, -l, bias, lightProj, n);
			#endif
			#endif
			#ifdef _Clusters
				#ifdef _ShadowMapAtlas
				direct *= PCFFakeCube(
					#ifndef _SingleAtlas
					shadowMapAtlasPoint
					#else
					shadowMapAtlas
					#endif
					, ld, -l, bias, lightProj, n, index
				);
				#else
					 if (index == 0) direct *= PCFCube(shadowMapPoint[0], ld, -l, bias, lightProj, n);
				else if (index == 1) direct *= PCFCube(shadowMapPoint[1], ld, -l, bias, lightProj, n);
				else if (index == 2) direct *= PCFCube(shadowMapPoint[2], ld, -l, bias, lightProj, n);
				else if (index == 3) direct *= PCFCube(shadowMapPoint[3], ld, -l, bias, lightProj, n);
				#endif
			#endif
		}
	#endif

	return direct;
}

// Backward-compatible overload for generated shaders that don't pass extended BRDF params
#ifdef _ExtBRDF
vec3 sampleLight(const vec3 p, const vec3 n, const vec3 v, const float dotNV, const vec3 lp, const vec3 lightCol,
	const vec3 albedo, const float rough, const float spec, const vec3 f0
	#ifdef _ShadowMap
		, int index, float bias, bool receiveShadow
	#endif
	#ifdef _Spot
		, bool isSpot, float spotSize, float spotBlend, vec3 spotDir, vec2 scale, vec3 right
	#endif
) {
	return sampleLight(p, n, v, dotNV, lp, lightCol, albedo, rough, spec, f0
		#ifdef _ShadowMap
			, index, bias, receiveShadow
		#endif
		#ifdef _Spot
			, isSpot, spotSize, spotBlend, spotDir, scale, right
		#endif
		#ifdef _ClearCoat
			, 0.0, 0.0, 1.5, vec3(1.0), n
		#endif
		#ifdef _Sheen
			, 0.0, 0.0, vec3(1.0)
		#endif
		#ifdef _Anisotropy
			, 0.0, 0.0, vec3(0.0)
		#endif
		#ifdef _SSS
			, 0.0, vec3(0.0), vec3(0.0), 0.0
		#endif
		#ifdef _Transmission
			, 0.0, 0.0, 1.45, 1.0
		#endif
	);
}
#endif // _ExtBRDF

#endif