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6e2ea0b9972e32d26cf406ccf134ec2edef3ea21
test2/intern/cycles/kernel/closure/bsdf.h
Lukas Stockner 014f6e4309 Cycles: Make Fresnel term independent of microfacet closure type 
Currently, we use the closure type to encode the type of microfacet distribution
(GGX/Beckmann/Sharp/MultiGGX), the lobes we're interested in
(Reflection/Refraction/both) AND the Fresnel type (None or Principled v1).

This results in the mess of dozens of options that we currently have. Since
adding Principled v2 and the MaterialX OSL closures will involve adding more
Fresnel types, this clearly doesn't scale.

But, since the earlier Fresnel rework (D17101), the Fresnel type only matters
in one place now. This allows to significantly clean up the closure type
handling. To do this, MicrofacetBsdfs now separately store their Fresnel type,
and instead of a single MicrofacetExtra we have one struct per Fresnel type
(unless no extra data is needed).

Further, instead of having one _setup() function per combination, the Fresnel
setup is also split into separate functions. This decouples the implementation
of new Fresnel terms from most of the Microfacet logic, and makes it a very
simple and clean operation.
2023-03-05 19:52:07 +01:00

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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2011-2022 Blender Foundation */
#pragma once
// clang-format off
#include "kernel/closure/bsdf_ashikhmin_velvet.h"
#include "kernel/closure/bsdf_diffuse.h"
#include "kernel/closure/bsdf_oren_nayar.h"
#include "kernel/closure/bsdf_phong_ramp.h"
#include "kernel/closure/bsdf_diffuse_ramp.h"
#include "kernel/closure/bsdf_microfacet.h"
#include "kernel/closure/bsdf_microfacet_multi.h"
#include "kernel/closure/bsdf_transparent.h"
#include "kernel/closure/bsdf_ashikhmin_shirley.h"
#include "kernel/closure/bsdf_toon.h"
#include "kernel/closure/bsdf_hair.h"
#include "kernel/closure/bsdf_hair_principled.h"
#include "kernel/closure/bsdf_principled_diffuse.h"
#include "kernel/closure/bsdf_principled_sheen.h"
#include "kernel/closure/bssrdf.h"
#include "kernel/closure/volume.h"
// clang-format on
CCL_NAMESPACE_BEGIN
/* Returns the square of the roughness of the closure if it has roughness,
* 0 for singular closures and 1 otherwise. */
ccl_device_inline float bsdf_get_specular_roughness_squared(ccl_private const ShaderClosure *sc)
{
if (CLOSURE_IS_BSDF_SINGULAR(sc->type)) {
return 0.0f;
}
if (CLOSURE_IS_BSDF_MICROFACET(sc->type)) {
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)sc;
return bsdf->alpha_x * bsdf->alpha_y;
}
return 1.0f;
}
ccl_device_inline float bsdf_get_roughness_squared(ccl_private const ShaderClosure *sc)
{
/* This version includes diffuse, mainly for baking Principled BSDF
* where specular and metallic zero otherwise does not bake the
* specified roughness parameter. */
if (sc->type == CLOSURE_BSDF_OREN_NAYAR_ID) {
ccl_private OrenNayarBsdf *bsdf = (ccl_private OrenNayarBsdf *)sc;
return sqr(sqr(bsdf->roughness));
}
if (sc->type == CLOSURE_BSDF_PRINCIPLED_DIFFUSE_ID) {
ccl_private PrincipledDiffuseBsdf *bsdf = (ccl_private PrincipledDiffuseBsdf *)sc;
return sqr(sqr(bsdf->roughness));
}
if (CLOSURE_IS_BSDF_DIFFUSE(sc->type)) {
return 0.0f;
}
return bsdf_get_specular_roughness_squared(sc);
}
/* An additional term to smooth illumination on grazing angles when using bump mapping.
* Based on "Taming the Shadow Terminator" by Matt Jen-Yuan Chiang,
* Yining Karl Li and Brent Burley. */
ccl_device_inline float bump_shadowing_term(float3 Ng, float3 N, float3 I)
{
const float cosNI = dot(N, I);
if (cosNI < 0.0f) {
Ng = -Ng;
}
float g = safe_divide(dot(Ng, I), cosNI * dot(Ng, N));
/* If the incoming light is on the unshadowed side, return full brightness. */
if (g >= 1.0f) {
return 1.0f;
}
/* If the incoming light points away from the surface, return black. */
if (g < 0.0f) {
return 0.0f;
}
/* Return smoothed value to avoid discontinuity at perpendicular angle. */
float g2 = sqr(g);
return -g2 * g + g2 + g;
}
ccl_device_inline float shift_cos_in(float cos_in, const float frequency_multiplier)
{
/* Shadow terminator workaround, taken from Appleseed.
* SPDX-License-Identifier: MIT
* Copyright (c) 2019 Francois Beaune, The appleseedhq Organization */
cos_in = min(cos_in, 1.0f);
const float angle = fast_acosf(cos_in);
const float val = max(cosf(angle * frequency_multiplier), 0.0f) / cos_in;
return val;
}
ccl_device_inline bool bsdf_is_transmission(ccl_private const ShaderClosure *sc, const float3 wo)
{
return dot(sc->N, wo) < 0.0f;
}
ccl_device_inline int bsdf_sample(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private const ShaderClosure *sc,
const int path_flag,
const float3 rand,
ccl_private Spectrum *eval,
ccl_private float3 *wo,
ccl_private float *pdf,
ccl_private float2 *sampled_roughness,
ccl_private float *eta)
{
/* For curves use the smooth normal, particularly for ribbons the geometric
* normal gives too much darkening otherwise. */
int label;
const float3 Ng = (sd->type & PRIMITIVE_CURVE) ? sc->N : sd->Ng;
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
label = bsdf_diffuse_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
#if defined(__SVM__) || defined(__OSL__)
case CLOSURE_BSDF_OREN_NAYAR_ID:
label = bsdf_oren_nayar_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
# ifdef __OSL__
case CLOSURE_BSDF_PHONG_RAMP_ID:
label = bsdf_phong_ramp_sample(
sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
label = bsdf_diffuse_ramp_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
label = bsdf_translucent_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
label = bsdf_transparent_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = zero_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_REFLECTION_ID:
case CLOSURE_BSDF_REFRACTION_ID:
case CLOSURE_BSDF_SHARP_GLASS_ID:
label = bsdf_microfacet_sharp_sample(sc,
path_flag,
Ng,
sd->wi,
rand.x,
rand.y,
rand.z,
eval,
wo,
pdf,
sampled_roughness,
eta);
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
label = bsdf_microfacet_ggx_sample(sc,
path_flag,
Ng,
sd->wi,
rand.x,
rand.y,
rand.z,
eval,
wo,
pdf,
sampled_roughness,
eta);
break;
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
label = bsdf_microfacet_multi_ggx_sample(kg,
sc,
Ng,
sd->wi,
rand.x,
rand.y,
eval,
wo,
pdf,
&sd->lcg_state,
sampled_roughness,
eta);
break;
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
label = bsdf_microfacet_multi_ggx_glass_sample(kg,
sc,
Ng,
sd->wi,
rand.x,
rand.y,
eval,
wo,
pdf,
&sd->lcg_state,
sampled_roughness,
eta);
break;
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID:
label = bsdf_microfacet_beckmann_sample(sc,
path_flag,
Ng,
sd->wi,
rand.x,
rand.y,
rand.z,
eval,
wo,
pdf,
sampled_roughness,
eta);
break;
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
label = bsdf_ashikhmin_shirley_sample(
sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
label = bsdf_ashikhmin_velvet_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
label = bsdf_diffuse_toon_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
label = bsdf_glossy_toon_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
// double check if this is valid
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
label = bsdf_hair_reflection_sample(
sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
label = bsdf_hair_transmission_sample(
sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_PRINCIPLED_ID:
label = bsdf_principled_hair_sample(
kg, sc, sd, rand.x, rand.y, rand.z, eval, wo, pdf, sampled_roughness, eta);
break;
case CLOSURE_BSDF_PRINCIPLED_DIFFUSE_ID:
label = bsdf_principled_diffuse_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_PRINCIPLED_SHEEN_ID:
label = bsdf_principled_sheen_sample(sc, Ng, sd->wi, rand.x, rand.y, eval, wo, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
#endif
default:
label = LABEL_NONE;
break;
}
/* Test if BSDF sample should be treated as transparent for background. */
if (label & LABEL_TRANSMIT) {
float threshold_squared = kernel_data.background.transparent_roughness_squared_threshold;
if (threshold_squared >= 0.0f && !(label & LABEL_DIFFUSE)) {
if (bsdf_get_specular_roughness_squared(sc) <= threshold_squared) {
label |= LABEL_TRANSMIT_TRANSPARENT;
}
}
}
else {
/* Shadow terminator offset. */
const float frequency_multiplier =
kernel_data_fetch(objects, sd->object).shadow_terminator_shading_offset;
if (frequency_multiplier > 1.0f) {
const float cosNO = dot(*wo, sc->N);
*eval *= shift_cos_in(cosNO, frequency_multiplier);
}
if (label & LABEL_DIFFUSE) {
if (!isequal(sc->N, sd->N)) {
*eval *= bump_shadowing_term(sd->N, sc->N, *wo);
}
}
}
#ifdef WITH_CYCLES_DEBUG
kernel_assert(*pdf >= 0.0f);
kernel_assert(eval->x >= 0.0f && eval->y >= 0.0f && eval->z >= 0.0f);
#endif
return label;
}
ccl_device_inline void bsdf_roughness_eta(const KernelGlobals kg,
ccl_private const ShaderClosure *sc,
ccl_private float2 *roughness,
ccl_private float *eta)
{
#ifdef __SVM__
float alpha = 1.0f;
#endif
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
#ifdef __SVM__
case CLOSURE_BSDF_OREN_NAYAR_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
# ifdef __OSL__
case CLOSURE_BSDF_PHONG_RAMP_ID:
alpha = phong_ramp_exponent_to_roughness(((ccl_private const PhongRampBsdf *)sc)->exponent);
*roughness = make_float2(alpha, alpha);
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
*roughness = zero_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_REFLECTION_ID:
case CLOSURE_BSDF_REFRACTION_ID:
case CLOSURE_BSDF_SHARP_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
*roughness = make_float2(bsdf->alpha_x, bsdf->alpha_y);
*eta = CLOSURE_IS_REFRACTIVE(bsdf->type) ? 1.0f / bsdf->ior : bsdf->ior;
break;
}
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
*roughness = make_float2(bsdf->alpha_x, bsdf->alpha_y);
*eta = bsdf->ior;
break;
}
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
*roughness = make_float2(bsdf->alpha_x, bsdf->alpha_y);
*eta = 1.0f;
break;
}
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
// double check if this is valid
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
*roughness = make_float2(((ccl_private HairBsdf *)sc)->roughness1,
((ccl_private HairBsdf *)sc)->roughness2);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
*roughness = make_float2(((ccl_private HairBsdf *)sc)->roughness1,
((ccl_private HairBsdf *)sc)->roughness2);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_PRINCIPLED_ID:
alpha = ((ccl_private PrincipledHairBSDF *)sc)->m0_roughness;
*roughness = make_float2(alpha, alpha);
*eta = ((ccl_private PrincipledHairBSDF *)sc)->eta;
break;
case CLOSURE_BSDF_PRINCIPLED_DIFFUSE_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_PRINCIPLED_SHEEN_ID:
*roughness = one_float2();
*eta = 1.0f;
break;
#endif
default:
*roughness = one_float2();
*eta = 1.0f;
break;
}
}
ccl_device_inline int bsdf_label(const KernelGlobals kg,
ccl_private const ShaderClosure *sc,
const float3 wo)
{
/* For curves use the smooth normal, particularly for ribbons the geometric
* normal gives too much darkening otherwise. */
int label;
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
case CLOSURE_BSSRDF_BURLEY_ID:
case CLOSURE_BSSRDF_RANDOM_WALK_ID:
case CLOSURE_BSSRDF_RANDOM_WALK_FIXED_RADIUS_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
#ifdef __SVM__
case CLOSURE_BSDF_OREN_NAYAR_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
# ifdef __OSL__
case CLOSURE_BSDF_PHONG_RAMP_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
label = LABEL_TRANSMIT | LABEL_DIFFUSE;
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
label = LABEL_TRANSMIT | LABEL_TRANSPARENT;
break;
case CLOSURE_BSDF_REFLECTION_ID:
case CLOSURE_BSDF_REFRACTION_ID:
case CLOSURE_BSDF_SHARP_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
label = ((bsdf_is_transmission(sc, wo)) ? LABEL_TRANSMIT : LABEL_REFLECT) |
((bsdf->alpha_x * bsdf->alpha_y <= 1e-7f) ? LABEL_SINGULAR : LABEL_GLOSSY);
break;
}
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
label = LABEL_TRANSMIT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_HAIR_PRINCIPLED_ID:
if (bsdf_is_transmission(sc, wo))
label = LABEL_TRANSMIT | LABEL_GLOSSY;
else
label = LABEL_REFLECT | LABEL_GLOSSY;
break;
case CLOSURE_BSDF_PRINCIPLED_DIFFUSE_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
case CLOSURE_BSDF_PRINCIPLED_SHEEN_ID:
label = LABEL_REFLECT | LABEL_DIFFUSE;
break;
#endif
default:
label = LABEL_NONE;
break;
}
/* Test if BSDF sample should be treated as transparent for background. */
if (label & LABEL_TRANSMIT) {
float threshold_squared = kernel_data.background.transparent_roughness_squared_threshold;
if (threshold_squared >= 0.0f) {
if (bsdf_get_specular_roughness_squared(sc) <= threshold_squared) {
label |= LABEL_TRANSMIT_TRANSPARENT;
}
}
}
return label;
}
#ifndef __KERNEL_CUDA__
ccl_device
#else
ccl_device_inline
#endif
Spectrum
bsdf_eval(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private const ShaderClosure *sc,
const float3 wo,
ccl_private float *pdf)
{
Spectrum eval = zero_spectrum();
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
eval = bsdf_diffuse_eval(sc, sd->wi, wo, pdf);
break;
#if defined(__SVM__) || defined(__OSL__)
case CLOSURE_BSDF_OREN_NAYAR_ID:
eval = bsdf_oren_nayar_eval(sc, sd->wi, wo, pdf);
break;
# ifdef __OSL__
case CLOSURE_BSDF_PHONG_RAMP_ID:
eval = bsdf_phong_ramp_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
eval = bsdf_diffuse_ramp_eval(sc, sd->wi, wo, pdf);
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
eval = bsdf_translucent_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
eval = bsdf_transparent_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_REFLECTION_ID:
case CLOSURE_BSDF_REFRACTION_ID:
case CLOSURE_BSDF_SHARP_GLASS_ID:
eval = bsdf_microfacet_sharp_eval(sc, sd->N, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
eval = bsdf_microfacet_ggx_eval(sc, sd->N, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
eval = bsdf_microfacet_multi_ggx_eval(sc, sd->N, sd->wi, wo, pdf, &sd->lcg_state);
break;
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
eval = bsdf_microfacet_multi_ggx_glass_eval(sc, sd->wi, wo, pdf, &sd->lcg_state);
break;
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID:
eval = bsdf_microfacet_beckmann_eval(sc, sd->N, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
eval = bsdf_ashikhmin_shirley_eval(sc, sd->N, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
eval = bsdf_ashikhmin_velvet_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
eval = bsdf_diffuse_toon_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
eval = bsdf_glossy_toon_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_HAIR_PRINCIPLED_ID:
eval = bsdf_principled_hair_eval(kg, sd, sc, wo, pdf);
break;
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
eval = bsdf_hair_reflection_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
eval = bsdf_hair_transmission_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_PRINCIPLED_DIFFUSE_ID:
eval = bsdf_principled_diffuse_eval(sc, sd->wi, wo, pdf);
break;
case CLOSURE_BSDF_PRINCIPLED_SHEEN_ID:
eval = bsdf_principled_sheen_eval(sc, sd->wi, wo, pdf);
break;
#endif
default:
break;
}
if (CLOSURE_IS_BSDF_DIFFUSE(sc->type)) {
if (!isequal(sc->N, sd->N)) {
eval *= bump_shadowing_term(sd->N, sc->N, wo);
}
}
/* Shadow terminator offset. */
const float frequency_multiplier =
kernel_data_fetch(objects, sd->object).shadow_terminator_shading_offset;
if (frequency_multiplier > 1.0f) {
const float cosNO = dot(wo, sc->N);
if (cosNO >= 0.0f) {
eval *= shift_cos_in(cosNO, frequency_multiplier);
}
}
#ifdef WITH_CYCLES_DEBUG
kernel_assert(*pdf >= 0.0f);
kernel_assert(eval.x >= 0.0f && eval.y >= 0.0f && eval.z >= 0.0f);
#endif
return eval;
}
ccl_device void bsdf_blur(KernelGlobals kg, ccl_private ShaderClosure *sc, float roughness)
{
/* TODO: do we want to blur volume closures? */
#if defined(__SVM__) || defined(__OSL__)
switch (sc->type) {
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
bsdf_microfacet_multi_ggx_blur(sc, roughness);
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
bsdf_microfacet_ggx_blur(sc, roughness);
break;
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID:
bsdf_microfacet_beckmann_blur(sc, roughness);
break;
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
bsdf_ashikhmin_shirley_blur(sc, roughness);
break;
case CLOSURE_BSDF_HAIR_PRINCIPLED_ID:
bsdf_principled_hair_blur(sc, roughness);
break;
default:
break;
}
#endif
}
ccl_device_inline Spectrum bsdf_albedo(ccl_private const ShaderData *sd,
ccl_private const ShaderClosure *sc)
{
Spectrum albedo = sc->weight;
/* Some closures include additional components such as Fresnel terms that cause their albedo to
* be below 1. The point of this function is to return a best-effort estimation of their albedo,
* meaning the amount of reflected/refracted light that would be expected when illuminated by a
* uniform white background.
* This is used for the denoising albedo pass and diffuse/glossy/transmission color passes.
* NOTE: This should always match the sample_weight of the closure - as in, if there's an albedo
* adjustment in here, the sample_weight should also be reduced accordingly.
* TODO(lukas): Consider calling this function to determine the sample_weight? Would be a bit of
* extra overhead though. */
#if defined(__SVM__) || defined(__OSL__)
if (CLOSURE_IS_BSDF_MICROFACET(sc->type)) {
albedo *= microfacet_fresnel((ccl_private const MicrofacetBsdf *)sc, sd->wi, sc->N, false);
}
else if (sc->type == CLOSURE_BSDF_PRINCIPLED_SHEEN_ID) {
albedo *= ((ccl_private const PrincipledSheenBsdf *)sc)->avg_value;
}
else if (sc->type == CLOSURE_BSDF_HAIR_PRINCIPLED_ID) {
albedo *= bsdf_principled_hair_albedo(sd, sc);
}
#endif
return albedo;
}
CCL_NAMESPACE_END
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