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Cycles / OSL: Support microfacet() closure color function from OSL 1.5

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This is basically just a wrapper class, which maps the generic call from the OSL spec to our closures.

Example usage:

shader microfacet_osl(
    color Color = color(0.8),
    int Distribution = 0,
    normal Normal = N,
    vector Tangent = normalize(dPdu),
    float RoughnessU = 0.0,
    float RoughnessV = 0.0,
    float IOR = 1.4,
    int Refract = 0,
    output closure color BSDF = 0)
{
    if (Distribution == 0)
        BSDF = Color * microfacet("ggx", Normal, Tangent, RoughnessU, RoughnessV, IOR, Refract);
    else
        BSDF = Color * microfacet("beckmann", Normal, Tangent, RoughnessU, RoughnessV, IOR, Refract);
}
This commit is contained in:
Thomas Dinges 2014-10-30 11:33:27 +01:00
parent 0414ed1c48
commit d5ed153760
1 changed files with 41 additions and 0 deletions
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41
intern/cycles/kernel/shaders/stdosl.h
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@ -505,6 +505,47 @@ closure color hair_transmission(normal N, float roughnessu, float roughnessv, ve
closure color henyey_greenstein(float g) BUILTIN;
closure color absorption() BUILTIN;
// OSL 1.5 Microfacet functions
closure color microfacet(string distribution, normal N, vector U, float xalpha, float yalpha, float eta, int refract) {
/* GGX */
if (distribution == "ggx" || distribution == "default") {
if (!refract) {
if (xalpha == yalpha) {
/* Isotropic */
return microfacet_ggx(N, xalpha);
}
else {
/* Anisotropic */
return microfacet_ggx_aniso(N, U, xalpha, yalpha);
}
}
else {
return microfacet_ggx_refraction(N, xalpha, eta);
}
}
/* Beckmann */
else {
if (!refract) {
if (xalpha == yalpha) {
/* Isotropic */
return microfacet_beckmann(N, xalpha);
}
else {
/* Anisotropic */
return microfacet_beckmann_aniso(N, U, xalpha, yalpha);
}
}
else {
return microfacet_beckmann_refraction(N, xalpha, eta);
}
}
}
closure color microfacet (string distribution, normal N, float alpha, float eta, int refract) {
return microfacet(distribution, N, vector(0), alpha, alpha, eta, refract);
}
// Renderer state
int backfacing () BUILTIN;
int raytype (string typename) BUILTIN;