Romain Guy
4585b8f896
* Add clear coat normal map support This change allows to set a separate normal map for the clear coat layer of a material. * Document the new clearCoatNormal property * Fix typo
65 lines
2.4 KiB
GLSL
65 lines
2.4 KiB
GLSL
//------------------------------------------------------------------------------
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// Material evaluation
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//------------------------------------------------------------------------------
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/**
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* Computes global shading parameters used to apply lighting, such as the view
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* vector in world space, the tangent frame at the shading point, etc.
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*/
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void computeShadingParams() {
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#if defined(HAS_ATTRIBUTE_TANGENTS)
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#if defined(GEOMETRIC_SPECULAR_AA_NORMAL)
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// Pick either the regular interpolated normal or the centroid interpolated
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// normal to reduce shading aliasing
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HIGHP vec3 n = dot(vertex_worldNormal, vertex_worldNormal) >= 1.01 ?
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vertex_worldNormalCentroid : vertex_worldNormal;
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#else
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HIGHP vec3 n = vertex_worldNormal;
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#endif
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#if defined(MATERIAL_IS_DOUBLE_SIDED)
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n = gl_FrontFacing ? n : -n;
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#endif
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#if defined(MATERIAL_HAS_ANISOTROPY) || defined(MATERIAL_HAS_NORMAL) || defined(MATERIAL_HAS_CLEAR_COAT_NORMAL)
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// Re-normalize post-interpolation values
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shading_tangentToWorld = mat3(
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normalize(vertex_worldTangent), normalize(vertex_worldBitangent), normalize(n));
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#endif
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// Leave the tangent and bitangent uninitialized, we won't use them
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shading_tangentToWorld[2] = normalize(n);
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#endif
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shading_position = vertex_worldPosition;
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shading_view = normalize(frameUniforms.cameraPosition - shading_position);
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}
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/**
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* Computes global shading parameters that the material might need to access
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* before lighting: N dot V, the reflected vector and the shading normal (before
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* applying the normal map). These parameters can be useful to material authors
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* to compute other material properties.
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*
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* This function must be invoked by the user's material code (guaranteed by
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* the material compiler) after setting a value for MaterialInputs.normal.
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*/
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void prepareMaterial(const MaterialInputs material) {
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#if defined(HAS_ATTRIBUTE_TANGENTS)
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#if defined(MATERIAL_HAS_NORMAL)
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shading_normal = normalize(shading_tangentToWorld * material.normal);
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#else
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shading_normal = shading_tangentToWorld[2];
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#endif
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shading_NoV = abs(dot(shading_normal, shading_view)) + FLT_EPS;
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shading_reflected = reflect(-shading_view, shading_normal);
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#if defined(MATERIAL_HAS_CLEAR_COAT)
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#if defined(MATERIAL_HAS_CLEAR_COAT_NORMAL)
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shading_clearCoatNormal = normalize(shading_tangentToWorld * material.clearCoatNormal);
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#else
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shading_clearCoatNormal = shading_tangentToWorld[2];
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#endif
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#endif
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#endif
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}
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