Sungun Park
87bdf96449
This commit renames all shader snippet files to conform to the newly introduced naming convention outlined in README.md. The new naming convention uses a `prefix_name.suffix` format to clearly indicate the purpose and target shader stage of each snippet. This improves the overall organization and readability of the shader code, making it easier to understand how each snippet contributes to the shader generation process. No functional changes were made to the shader code itself or source code. This is purely a refactoring for clarity and maintainability.
51 lines
2.1 KiB
GLSL
51 lines
2.1 KiB
GLSL
/**
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* Evaluates lit materials with the cloth shading model. Similar to the standard
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* model, the cloth shading model is based on a Cook-Torrance microfacet model.
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* Its distribution and visibility terms are however very different to take into
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* account the softer apperance of many types of cloth. Some highly reflecting
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* fabrics like satin or leather should use the standard model instead.
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*
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* This shading model optionally models subsurface scattering events. The
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* computation of these events is not physically based but can add necessary
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* details to a material.
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*/
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vec3 surfaceShading(const PixelParams pixel, const Light light, float occlusion) {
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vec3 h = normalize(shading_view + light.l);
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float NoL = light.NoL;
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float NoH = saturate(dot(shading_normal, h));
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float LoH = saturate(dot(light.l, h));
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// specular BRDF
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float D = distributionCloth(pixel.roughness, NoH);
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float V = visibilityCloth(shading_NoV, NoL);
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vec3 F = pixel.f0;
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// Ignore pixel.energyCompensation since we use a different BRDF here
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vec3 Fr = (D * V) * F;
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// diffuse BRDF
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float diffuse = diffuse(pixel.roughness, shading_NoV, NoL, LoH);
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#if defined(MATERIAL_HAS_SUBSURFACE_COLOR)
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// Energy conservative wrap diffuse to simulate subsurface scattering
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diffuse *= Fd_Wrap(dot(shading_normal, light.l), 0.5);
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#endif
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// We do not multiply the diffuse term by the Fresnel term as discussed in
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// Neubelt and Pettineo 2013, "Crafting a Next-gen Material Pipeline for The Order: 1886"
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// The effect is fairly subtle and not deemed worth the cost for mobile
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vec3 Fd = diffuse * pixel.diffuseColor;
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#if defined(MATERIAL_HAS_SUBSURFACE_COLOR)
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// Cheap subsurface scatter
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Fd *= saturate(pixel.subsurfaceColor + NoL);
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// We need to apply NoL separately to the specular lobe since we already took
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// it into account in the diffuse lobe
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vec3 color = Fd + Fr * NoL;
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color *= light.colorIntensity.rgb * (light.colorIntensity.w * light.attenuation * occlusion);
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#else
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vec3 color = Fd + Fr;
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color *= light.colorIntensity.rgb * (light.colorIntensity.w * light.attenuation * NoL * occlusion);
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#endif
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return color;
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}
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