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4e027fdde6ea0940be97b4e64317980ebf5cc175
test/intern/cycles/kernel/closure/bsdf.h
Brecht Van Lommel 3d29bbcc38 Fix T103049: Cycles specular light leak regression 
The logic here is not ideal but was unintentionally changed in refactoring
for path guiding, now restore it back to 3.3 behavior again.
2022-12-15 21:49:59 +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_reflection.h"
#include "kernel/closure/bsdf_refraction.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 omega_in)
{
return dot(sc->N, omega_in) < 0.0f;
}
ccl_device_inline int bsdf_sample(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private const ShaderClosure *sc,
float randu,
float randv,
ccl_private Spectrum *eval,
ccl_private float3 *omega_in,
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->I, randu, randv, eval, omega_in, 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->I, randu, randv, eval, omega_in, 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->I, randu, randv, eval, omega_in, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
label = bsdf_diffuse_ramp_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
label = bsdf_translucent_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_REFLECTION_ID:
label = bsdf_reflection_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, pdf, eta);
*sampled_roughness = zero_float2();
break;
case CLOSURE_BSDF_REFRACTION_ID:
label = bsdf_refraction_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, pdf, eta);
*sampled_roughness = zero_float2();
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
label = bsdf_transparent_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, pdf);
*sampled_roughness = zero_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_FRESNEL_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
label = bsdf_microfacet_ggx_sample(
kg, sc, Ng, sd->I, randu, randv, eval, omega_in, pdf, sampled_roughness, eta);
break;
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_FRESNEL_ID:
label = bsdf_microfacet_multi_ggx_sample(kg,
sc,
Ng,
sd->I,
randu,
randv,
eval,
omega_in,
pdf,
&sd->lcg_state,
sampled_roughness,
eta);
break;
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_FRESNEL_ID:
label = bsdf_microfacet_multi_ggx_glass_sample(kg,
sc,
Ng,
sd->I,
randu,
randv,
eval,
omega_in,
pdf,
&sd->lcg_state,
sampled_roughness,
eta);
break;
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
label = bsdf_microfacet_beckmann_sample(
kg, sc, Ng, sd->I, randu, randv, eval, omega_in, pdf, sampled_roughness, eta);
break;
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
label = bsdf_ashikhmin_shirley_sample(
sc, Ng, sd->I, randu, randv, eval, omega_in, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
label = bsdf_ashikhmin_velvet_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
label = bsdf_diffuse_toon_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
label = bsdf_glossy_toon_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, 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->I, randu, randv, eval, omega_in, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
label = bsdf_hair_transmission_sample(
sc, Ng, sd->I, randu, randv, eval, omega_in, pdf, sampled_roughness);
*eta = 1.0f;
break;
case CLOSURE_BSDF_HAIR_PRINCIPLED_ID:
label = bsdf_principled_hair_sample(
kg, sc, sd, randu, randv, eval, omega_in, pdf, sampled_roughness, eta);
break;
case CLOSURE_BSDF_PRINCIPLED_DIFFUSE_ID:
label = bsdf_principled_diffuse_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, pdf);
*sampled_roughness = one_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_PRINCIPLED_SHEEN_ID:
label = bsdf_principled_sheen_sample(sc, Ng, sd->I, randu, randv, eval, omega_in, 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 cosNI = dot(*omega_in, sc->N);
*eval *= shift_cos_in(cosNI, frequency_multiplier);
}
if (label & LABEL_DIFFUSE) {
if (!isequal(sc->N, sd->N)) {
*eval *= bump_shadowing_term(sd->N, sc->N, *omega_in);
}
}
}
#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__
bool refractive = false;
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_REFLECTION_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
*roughness = zero_float2();
*eta = bsdf->ior;
break;
}
case CLOSURE_BSDF_REFRACTION_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
*roughness = zero_float2();
// do we need to inverse eta??
*eta = bsdf->ior;
break;
}
case CLOSURE_BSDF_TRANSPARENT_ID:
*roughness = zero_float2();
*eta = 1.0f;
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_FRESNEL_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
*roughness = make_float2(bsdf->alpha_x, bsdf->alpha_y);
refractive = bsdf->type == CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID;
*eta = refractive ? 1.0f / bsdf->ior : bsdf->ior;
break;
}
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_FRESNEL_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_MICROFACET_MULTI_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_FRESNEL_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_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
*roughness = make_float2(bsdf->alpha_x, bsdf->alpha_y);
refractive = bsdf->type == CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID;
*eta = refractive ? 1.0f / bsdf->ior : 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 omega_in)
{
/* 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_REFLECTION_ID:
label = LABEL_REFLECT | LABEL_SINGULAR;
break;
case CLOSURE_BSDF_REFRACTION_ID:
label = LABEL_TRANSMIT | LABEL_SINGULAR;
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
label = LABEL_TRANSMIT | LABEL_TRANSPARENT;
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_FRESNEL_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_FRESNEL_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
label = (bsdf->alpha_x * bsdf->alpha_y <= 1e-7f) ? LABEL_REFLECT | LABEL_SINGULAR :
LABEL_REFLECT | LABEL_GLOSSY;
break;
}
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID: {
ccl_private const MicrofacetBsdf *bsdf = (ccl_private const MicrofacetBsdf *)sc;
label = (bsdf->alpha_x * bsdf->alpha_y <= 1e-7f) ? LABEL_TRANSMIT | LABEL_SINGULAR :
LABEL_TRANSMIT | LABEL_GLOSSY;
break;
}
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_FRESNEL_ID:
label = (bsdf_is_transmission(sc, omega_in)) ? LABEL_TRANSMIT | LABEL_GLOSSY :
LABEL_REFLECT | 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, omega_in))
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 omega_in,
ccl_private float *pdf)
{
Spectrum eval = zero_spectrum();
switch (sc->type) {
case CLOSURE_BSDF_DIFFUSE_ID:
eval = bsdf_diffuse_eval(sc, sd->I, omega_in, pdf);
break;
#if defined(__SVM__) || defined(__OSL__)
case CLOSURE_BSDF_OREN_NAYAR_ID:
eval = bsdf_oren_nayar_eval(sc, sd->I, omega_in, pdf);
break;
# ifdef __OSL__
case CLOSURE_BSDF_PHONG_RAMP_ID:
eval = bsdf_phong_ramp_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_DIFFUSE_RAMP_ID:
eval = bsdf_diffuse_ramp_eval(sc, sd->I, omega_in, pdf);
break;
# endif
case CLOSURE_BSDF_TRANSLUCENT_ID:
eval = bsdf_translucent_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_REFLECTION_ID:
eval = bsdf_reflection_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_REFRACTION_ID:
eval = bsdf_refraction_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_TRANSPARENT_ID:
eval = bsdf_transparent_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_FRESNEL_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
eval = bsdf_microfacet_ggx_eval(sc, sd->N, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_FRESNEL_ID:
eval = bsdf_microfacet_multi_ggx_eval(sc, sd->N, sd->I, omega_in, pdf, &sd->lcg_state);
break;
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_FRESNEL_ID:
eval = bsdf_microfacet_multi_ggx_glass_eval(sc, sd->I, omega_in, pdf, &sd->lcg_state);
break;
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID:
eval = bsdf_microfacet_beckmann_eval(sc, sd->N, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
eval = bsdf_ashikhmin_shirley_eval(sc, sd->N, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID:
eval = bsdf_ashikhmin_velvet_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_DIFFUSE_TOON_ID:
eval = bsdf_diffuse_toon_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_GLOSSY_TOON_ID:
eval = bsdf_glossy_toon_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_HAIR_PRINCIPLED_ID:
eval = bsdf_principled_hair_eval(kg, sd, sc, omega_in, pdf);
break;
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
eval = bsdf_hair_reflection_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID:
eval = bsdf_hair_transmission_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_PRINCIPLED_DIFFUSE_ID:
eval = bsdf_principled_diffuse_eval(sc, sd->I, omega_in, pdf);
break;
case CLOSURE_BSDF_PRINCIPLED_SHEEN_ID:
eval = bsdf_principled_sheen_eval(sc, sd->I, omega_in, 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, omega_in);
}
}
/* Shadow terminator offset. */
const float frequency_multiplier =
kernel_data_fetch(objects, sd->object).shadow_terminator_shading_offset;
if (frequency_multiplier > 1.0f) {
const float cosNI = dot(omega_in, sc->N);
if (cosNI >= 0.0f) {
eval *= shift_cos_in(cosNI, 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_FRESNEL_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_FRESNEL_ID:
bsdf_microfacet_multi_ggx_blur(sc, roughness);
break;
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_GGX_FRESNEL_ID:
case CLOSURE_BSDF_MICROFACET_GGX_CLEARCOAT_ID:
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
bsdf_microfacet_ggx_blur(sc, roughness);
break;
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_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_NAMESPACE_END
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