1+ // _____________________________ Base Diffuse Layer IBL _______________________________________
2+ #ifdef REFLECTION
3+ // Pass in a vector to sample teh irradiance with (to handle reflection or )
4+ vec3 baseDiffuseEnvironmentLight = sampleIrradiance (
5+ normalW
6+ #if defined (NORMAL) && defined (USESPHERICALINVERTEX)
7+ , vEnvironmentIrradiance
8+ #endif
9+ #if (defined (USESPHERICALFROMREFLECTIONMAP) && (!defined (NORMAL) || !defined (USESPHERICALINVERTEX))) || (defined (USEIRRADIANCEMAP) && defined (REFLECTIONMAP_3D))
10+ , reflectionMatrix
11+ #endif
12+ #ifdef USEIRRADIANCEMAP
13+ , irradianceSampler
14+ #ifdef USE_IRRADIANCE_DOMINANT_DIRECTION
15+ , vReflectionDominantDirection
16+ #endif
17+ #endif
18+ #ifdef REALTIME_FILTERING
19+ , vReflectionFilteringInfo
20+ #ifdef IBL_CDF_FILTERING
21+ , icdfSampler
22+ #endif
23+ #endif
24+ , vReflectionInfos
25+ , viewDirectionW
26+ , base_diffuse_roughness
27+ , base_color
28+ );
29+
30+ // _____________________________ Base Specular Layer IBL _______________________________________
31+
32+ #ifdef REFLECTIONMAP_3D
33+ vec3 reflectionCoords = vec3 (0 ., 0 ., 0 .);
34+ #else
35+ vec2 reflectionCoords = vec2 (0 ., 0 .);
36+ #endif
37+ reflectionCoords = createReflectionCoords (vPositionW, normalW);
38+ float specularAlphaG = specular_roughness * specular_roughness;
39+ vec3 baseSpecularEnvironmentLight = sampleRadiance (specularAlphaG, vReflectionMicrosurfaceInfos.rgb, vReflectionInfos
40+ #if defined (LODINREFLECTIONALPHA) && !defined (REFLECTIONMAP_SKYBOX)
41+ , baseGeoInfo.NdotVUnclamped
42+ #endif
43+ , reflectionSampler
44+ , reflectionCoords
45+ #ifdef REALTIME_FILTERING
46+ , vReflectionFilteringInfo
47+ #endif
48+ );
49+
50+ baseSpecularEnvironmentLight = mix (baseSpecularEnvironmentLight.rgb, baseDiffuseEnvironmentLight, specularAlphaG);
51+
52+ vec3 coatEnvironmentLight = vec3 (0 ., 0 ., 0 .);
53+ if (coat_weight > 0.0 ) {
54+ #ifdef REFLECTIONMAP_3D
55+ vec3 reflectionCoords = vec3 (0 ., 0 ., 0 .);
56+ #else
57+ vec2 reflectionCoords = vec2 (0 ., 0 .);
58+ #endif
59+ reflectionCoords = createReflectionCoords (vPositionW, coatNormalW);
60+ float coatAlphaG = coat_roughness * coat_roughness;
61+ coatEnvironmentLight = sampleRadiance (coatAlphaG, vReflectionMicrosurfaceInfos.rgb, vReflectionInfos
62+ #if defined (LODINREFLECTIONALPHA) && !defined (REFLECTIONMAP_SKYBOX)
63+ , coatGeoInfo.NdotVUnclamped
64+ #endif
65+ , reflectionSampler
66+ , reflectionCoords
67+ #ifdef REALTIME_FILTERING
68+ , vReflectionFilteringInfo
69+ #endif
70+ );
71+ }
72+
73+ // ______________________________ IBL Fresnel Reflectance ____________________________
74+
75+ // Dielectric IBL Fresnel
76+ // The colored fresnel represents the % of light reflected by the base specular lobe
77+ // The non-colored fresnel represents the % of light that doesn't penetrate through
78+ // the base specular lobe. i.e. the specular lobe isn't energy conserving for coloured specular.
79+ float dielectricIblFresnel = getReflectanceFromBRDFLookup (vec3 (baseDielectricReflectance.F0), vec3 (baseDielectricReflectance.F90), baseGeoInfo.environmentBrdf).r;
80+ vec3 dielectricIblColoredFresnel = getReflectanceFromBRDFLookup (baseDielectricReflectance.coloredF0, baseDielectricReflectance.coloredF90, baseGeoInfo.environmentBrdf);
81+
82+ // Conductor IBL Fresnel
83+ vec3 conductorIblFresnel = conductorIblFresnel (baseConductorReflectance, baseGeoInfo.NdotV, specular_roughness, baseGeoInfo.environmentBrdf);
84+
85+ // Coat IBL Fresnel
86+ float coatIblFresnel = 0.0 ;
87+ if (coat_weight > 0.0 ) {
88+ coatIblFresnel = getReflectanceFromBRDFLookup (vec3 (coatReflectance.F0), vec3 (coatReflectance.F90), coatGeoInfo.environmentBrdf).r;
89+ }
90+
91+
92+ vec3 slab_diffuse_ibl = vec3 (0 ., 0 ., 0 .);
93+ vec3 slab_glossy_ibl = vec3 (0 ., 0 ., 0 .);
94+ vec3 slab_metal_ibl = vec3 (0 ., 0 ., 0 .);
95+ vec3 slab_coat_ibl = vec3 (0 ., 0 ., 0 .);
96+
97+ slab_diffuse_ibl = baseDiffuseEnvironmentLight * vLightingIntensity.z;
98+ slab_diffuse_ibl *= aoOut.ambientOcclusionColor;
99+
100+ // Add the specular environment light
101+ slab_glossy_ibl = baseSpecularEnvironmentLight * vLightingIntensity.z;
102+
103+ // _____________________________ Metal Layer IBL ____________________________
104+ slab_metal_ibl = baseSpecularEnvironmentLight * conductorIblFresnel * vLightingIntensity.z;
105+
106+ // _____________________________ Coat Layer IBL _____________________________
107+ if (coat_weight > 0.0 ) {
108+ slab_coat_ibl = coatEnvironmentLight * vLightingIntensity.z;
109+ }
110+
111+ // TEMP
112+ vec3 slab_subsurface_ibl = vec3 (0 ., 0 ., 0 .);
113+ vec3 slab_translucent_base_ibl = vec3 (0 ., 0 ., 0 .);
114+ vec3 slab_fuzz_ibl = vec3 (0 ., 0 ., 0 .);
115+
116+ slab_diffuse_ibl *= base_color.rgb;
117+
118+ // _____________________________ IBL Material Layer Composition ______________________________________
119+ #define CUSTOM_FRAGMENT_BEFORE_IBLLAYERCOMPOSITION
120+ vec3 material_opaque_base_ibl = mix (slab_diffuse_ibl, slab_subsurface_ibl, subsurface_weight);
121+ vec3 material_dielectric_base_ibl = mix (material_opaque_base_ibl, slab_translucent_base_ibl, transmission_weight);
122+ vec3 material_dielectric_gloss_ibl = layer (material_dielectric_base_ibl, slab_glossy_ibl, dielectricIblFresnel, vec3 (1.0 ), specular_color);
123+ vec3 material_base_substrate_ibl = mix (material_dielectric_gloss_ibl, slab_metal_ibl, base_metalness);
124+ vec3 material_coated_base_ibl = layer (material_base_substrate_ibl, slab_coat_ibl, coatIblFresnel, coat_color, vec3 (1.0 ));
125+ material_surface_ibl = mix (material_coated_base_ibl, slab_fuzz_ibl, fuzz_weight);
126+
127+ #endif
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