#endif
#endif
-// Converts roughness value from range [0, 1] to real value for calculations
+#if defined(THE_IS_PBR)
+//! Converts roughness value from range [0, 1] to real value for calculations
float occRoughness (in float theNormalizedRoughness);
-// Front material properties accessors
-#if !defined(THE_IS_PBR)
-vec4 occFrontMaterial_Emission(void); //!< Emission color
-vec4 occFrontMaterial_Ambient(void); //!< Ambient reflection
-vec4 occFrontMaterial_Diffuse(void); //!< Diffuse reflection
-vec4 occFrontMaterial_Specular(void); //!< Specular reflection
-float occFrontMaterial_Shininess(void); //!< Specular exponent
-float occFrontMaterial_Transparency(void); //!< Transparency coefficient
+// Front/back material properties accessors
+vec4 occPBRMaterial_Color(in bool theIsFront); //!< Base color of PBR material
+float occPBRMaterial_Metallic(in bool theIsFront); //!< Metallic coefficient
+float occPBRMaterial_NormalizedRoughness(in bool theIsFront); //!< Normalized roughness coefficient
+vec3 occPBRMaterial_Emission(in bool theIsFront); //!< Light intensity emitted by material
+float occPBRMaterial_IOR(in bool theIsFront); //!< Index of refraction
#else
-vec4 occPBRFrontMaterial_Color(void); //!< Base color of PBR material
-float occPBRFrontMaterial_Metallic(void); //!< Metallic coefficient
-float occPBRFrontMaterial_Roughness(void); //!< Roughness coefficient
-float occPBRFrontMaterial_NormalizedRoughness(void); //!< Normalized roughness coefficient
-vec3 occPBRFrontMaterial_Emission(void); //!< Light intensity emitted by material
-float occPBRFrontMaterial_IOR(void); //!< Index of refraction
-#endif
+// Front material properties accessors
+vec4 occFrontMaterial_Emission(void); //!< Emission color
+vec4 occFrontMaterial_Ambient(void); //!< Ambient reflection
+vec4 occFrontMaterial_Diffuse(void); //!< Diffuse reflection
+vec4 occFrontMaterial_Specular(void); //!< Specular reflection
+float occFrontMaterial_Shininess(void); //!< Specular exponent
+float occFrontMaterial_Transparency(void); //!< Transparency coefficient
// Back material properties accessors
-#if !defined(THE_IS_PBR)
vec4 occBackMaterial_Emission(void); //!< Emission color
vec4 occBackMaterial_Ambient(void); //!< Ambient reflection
vec4 occBackMaterial_Diffuse(void); //!< Diffuse reflection
vec4 occBackMaterial_Specular(void); //!< Specular reflection
float occBackMaterial_Shininess(void); //!< Specular exponent
float occBackMaterial_Transparency(void); //!< Transparency coefficient
-#else
-vec4 occPBRBackMaterial_Color(void); //!< Base color of PBR material
-float occPBRBackMaterial_Metallic(void); //!< Metallic coefficient
-float occPBRBackMaterial_Roughness(void); //!< Roughness coefficient
-float occPBRBackMaterial_NormalizedRoughness(void); //!< Normalized roughness coefficient
-vec3 occPBRBackMaterial_Emission(void); //!< Light intensity emitted by material
-float occPBRBackMaterial_IOR(void); //!< Index of refraction
#endif
#ifdef THE_HAS_DEFAULT_SAMPLER
-#define occActiveSampler occSampler0 //!< alias for backward compatibility
-#define occSamplerBaseColor occSampler0 //!< alias to a base color texture
-uniform sampler2D occSampler0; //!< current active sampler;
+#define occActiveSampler occSampler0 //!< alias for backward compatibility
+#define occSamplerBaseColor occSampler0 //!< alias to a base color texture
+uniform sampler2D occSampler0; //!< current active sampler;
+#endif //! occSampler1, occSampler2,... should be defined in GLSL program body for multitexturing
+
+#if defined(THE_HAS_TEXTURE_COLOR)
+#define occTextureColor(theMatColor, theTexCoord) (theMatColor * occTexture2D(occSamplerBaseColor, theTexCoord))
+#else
+#define occTextureColor(theMatColor, theTexCoord) theMatColor
+#endif
+
+#if defined(THE_HAS_TEXTURE_OCCLUSION) && defined(FRAGMENT_SHADER)
+uniform sampler2D occSamplerOcclusion; //!< R occlusion texture sampler
+#define occTextureOcclusion(theColor, theTexCoord) theColor *= occTexture2D(occSamplerOcclusion, theTexCoord).r;
+#else
+#define occTextureOcclusion(theColor, theTexCoord)
#endif
- //! occSampler1, occSampler2,... should be defined in GLSL program body for multitexturing
+
+#if defined(THE_HAS_TEXTURE_EMISSIVE) && defined(FRAGMENT_SHADER)
+uniform sampler2D occSamplerEmissive; //!< RGB emissive texture sampler
+#define occTextureEmissive(theMatEmis, theTexCoord) (theMatEmis * occTexture2D(occSamplerEmissive, theTexCoord).rgb)
+#else
+#define occTextureEmissive(theMatEmis, theTexCoord) theMatEmis
+#endif
+
+#if defined(THE_HAS_TEXTURE_NORMAL) && defined(FRAGMENT_SHADER)
+uniform sampler2D occSamplerNormal; //!< XYZ normal texture sampler with W==0 indicating no texture
+#define occTextureNormal(theTexCoord) occTexture2D(occSamplerNormal, theTexCoord)
+#else
+#define occTextureNormal(theTexCoord) vec4(0.0) // no normal map
+#endif
+
+#if defined(THE_HAS_TEXTURE_METALROUGHNESS) && defined(FRAGMENT_SHADER)
+uniform sampler2D occSamplerMetallicRoughness; //!< BG metallic-roughness texture sampler
+#define occTextureRoughness(theRoug, theTexCoord) (theRoug * occTexture2D(occSamplerMetallicRoughness, theTexCoord).g)
+#define occTextureMetallic(theMet, theTexCoord) (theMet * occTexture2D(occSamplerMetallicRoughness, theTexCoord).b)
+#else
+#define occTextureRoughness(theRoug, theTexCoord) theRoug
+#define occTextureMetallic(theMet, theTexCoord) theMet
+#endif
+
uniform vec4 occColor; //!< color value (in case of disabled lighting)
uniform THE_PREC_ENUM int occDistinguishingMode; //!< Are front and back faces distinguished?
uniform THE_PREC_ENUM int occTextureEnable; //!< Is texture enabled?
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