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Cycles: Temporary fix for Principled Hair albedo

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The proper fix (bb9eb262d4) caused compilation problems with HIP, so we're
delaying it until 3.6.
To fix the original bug report (#104586), this is a quick workaround that'll
hopefully not upset the compiler.

Pull Request #104723
This commit is contained in:
Lukas Stockner
2023-02-13 23:47:55 +01:00
committed by Gitea
parent 5040c39d1a
commit 1e449bee21
2 changed files with 11 additions and 3 deletions
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2
intern/cycles/kernel/closure/bsdf.h
View File

@@ -686,7 +686,7 @@ ccl_device_inline Spectrum bsdf_albedo(ccl_private const ShaderData *sd,
albedo *= ((ccl_private const PrincipledSheenBsdf *)sc)->avg_value;
break;
case CLOSURE_BSDF_HAIR_PRINCIPLED_ID:
albedo *= bsdf_principled_hair_albedo(sc);
albedo *= bsdf_principled_hair_albedo(sd, sc);
break;
default:
break;

12
intern/cycles/kernel/closure/bsdf_hair_principled.h
View File

@@ -478,10 +478,18 @@ ccl_device_inline float bsdf_principled_hair_albedo_roughness_scale(
return (((((0.245f * x) + 5.574f) * x - 10.73f) * x + 2.532f) * x - 0.215f) * x + 5.969f;
}
ccl_device Spectrum bsdf_principled_hair_albedo(ccl_private const ShaderClosure *sc)
ccl_device Spectrum bsdf_principled_hair_albedo(ccl_private const ShaderData *sd,
ccl_private const ShaderClosure *sc)
{
ccl_private PrincipledHairBSDF *bsdf = (ccl_private PrincipledHairBSDF *)sc;
return exp(-sqrt(bsdf->sigma) * bsdf_principled_hair_albedo_roughness_scale(bsdf->v));
const float cos_theta_o = cos_from_sin(dot(sd->wi, safe_normalize(sd->dPdu)));
const float cos_gamma_o = cos_from_sin(bsdf->extra->geom.w);
const float f = fresnel_dielectric_cos(cos_theta_o * cos_gamma_o, bsdf->eta);
const float roughness_scale = bsdf_principled_hair_albedo_roughness_scale(bsdf->v);
/* TODO(lukas): Adding the Fresnel term here as a workaround until the proper refactor. */
return exp(-sqrt(bsdf->sigma) * roughness_scale) + make_spectrum(f);
}
ccl_device_inline Spectrum