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2db026ef67bc66f951dc45ccba37544c200e94de
test/intern/cycles/kernel/svm/closure.h
Alexandre-Cardaillac 921c2b9d61 Shader: New Volume Coefficients Shader 
Add a new shader node to control volume coefficients (scattering,
absorption and emission) directly, making it easier to model existing
volumes with measured data.

Pull Request: https://projects.blender.org/blender/blender/pulls/136287
2025-05-08 19:19:35 +02:00

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/* SPDX-FileCopyrightText: 2011-2022 Blender Foundation
*
* SPDX-License-Identifier: Apache-2.0 */
#pragma once
#include "kernel/closure/alloc.h"
#include "kernel/closure/bsdf.h"
#include "kernel/closure/bsdf_util.h"
#include "kernel/closure/bssrdf.h"
#include "kernel/closure/emissive.h"
#include "kernel/closure/volume.h"
#include "kernel/geom/curve.h"
#include "kernel/geom/object.h"
#include "kernel/geom/primitive.h"
#include "kernel/svm/math_util.h"
#include "kernel/svm/util.h"
#include "kernel/util/colorspace.h"
CCL_NAMESPACE_BEGIN
/* Closure Nodes */
ccl_device_inline int svm_node_closure_bsdf_skip(KernelGlobals kg, int offset, const uint type)
{
if (type == CLOSURE_BSDF_PRINCIPLED_ID) {
/* Read all principled BSDF extra data to get the right offset. */
read_node(kg, &offset);
read_node(kg, &offset);
read_node(kg, &offset);
read_node(kg, &offset);
}
return offset;
}
template<uint node_feature_mask, ShaderType shader_type>
#ifndef __KERNEL_ONEAPI__
ccl_device_noinline
#else
ccl_device
#endif
int
svm_node_closure_bsdf(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
Spectrum closure_weight,
const uint4 node,
const uint32_t path_flag,
int offset)
{
uint type;
uint param1_offset;
uint param2_offset;
uint mix_weight_offset;
svm_unpack_node_uchar4(node.y, &type, &param1_offset, &param2_offset, &mix_weight_offset);
const float mix_weight = (stack_valid(mix_weight_offset) ?
stack_load_float(stack, mix_weight_offset) :
1.0f);
/* note we read this extra node before weight check, so offset is added */
const uint4 data_node = read_node(kg, &offset);
/* Only compute BSDF for surfaces, transparent variable is shared with volume extinction. */
IF_KERNEL_NODES_FEATURE(BSDF)
{
if ((shader_type != SHADER_TYPE_SURFACE) || mix_weight == 0.0f) {
return svm_node_closure_bsdf_skip(kg, offset, type);
}
}
else IF_KERNEL_NODES_FEATURE(EMISSION) {
if (type != CLOSURE_BSDF_PRINCIPLED_ID) {
/* Only principled BSDF can have emission. */
return svm_node_closure_bsdf_skip(kg, offset, type);
}
}
else {
return svm_node_closure_bsdf_skip(kg, offset, type);
}
float3 N = stack_valid(data_node.x) ? stack_load_float3(stack, data_node.x) : sd->N;
N = safe_normalize_fallback(N, sd->N);
const float param1 = (stack_valid(param1_offset)) ? stack_load_float(stack, param1_offset) :
__uint_as_float(node.z);
const float param2 = (stack_valid(param2_offset)) ? stack_load_float(stack, param2_offset) :
__uint_as_float(node.w);
switch (type) {
case CLOSURE_BSDF_PRINCIPLED_ID: {
uint specular_ior_level_offset;
uint roughness_offset;
uint specular_tint_offset;
uint anisotropic_offset;
uint sheen_weight_offset;
uint sheen_tint_offset;
uint sheen_roughness_offset;
uint coat_weight_offset;
uint coat_roughness_offset;
uint coat_ior_offset;
uint eta_offset;
uint transmission_weight_offset;
uint anisotropic_rotation_offset;
uint coat_tint_offset;
uint coat_normal_offset;
uint alpha_offset;
uint emission_strength_offset;
uint emission_offset;
uint thinfilm_thickness_offset;
uint diffuse_roughness_offset;
const uint4 data_node2 = read_node(kg, &offset);
float3 T = stack_load_float3(stack, data_node.y);
svm_unpack_node_uchar4(data_node.z,
&specular_ior_level_offset,
&roughness_offset,
&specular_tint_offset,
&anisotropic_offset);
svm_unpack_node_uchar4(data_node.w,
&sheen_weight_offset,
&sheen_tint_offset,
&sheen_roughness_offset,
&diffuse_roughness_offset);
svm_unpack_node_uchar4(data_node2.x,
&eta_offset,
&transmission_weight_offset,
&anisotropic_rotation_offset,
&coat_normal_offset);
svm_unpack_node_uchar4(data_node2.w,
&coat_weight_offset,
&coat_roughness_offset,
&coat_ior_offset,
&coat_tint_offset);
// get Disney principled parameters
const float metallic = saturatef(param1);
#ifdef __SUBSURFACE__
const float subsurface_weight = saturatef(param2);
#else
const float subsurface_weight = 0.0f;
#endif
const float specular_ior_level = max(stack_load_float(stack, specular_ior_level_offset),
0.0f);
const float roughness = saturatef(stack_load_float(stack, roughness_offset));
const Spectrum specular_tint = rgb_to_spectrum(
max(stack_load_float3(stack, specular_tint_offset), zero_float3()));
const float anisotropic = saturatef(stack_load_float(stack, anisotropic_offset));
const float sheen_weight = max(stack_load_float(stack, sheen_weight_offset), 0.0f);
const float3 sheen_tint = max(stack_load_float3(stack, sheen_tint_offset), zero_float3());
const float sheen_roughness = saturatef(stack_load_float(stack, sheen_roughness_offset));
const float coat_weight = fmaxf(stack_load_float(stack, coat_weight_offset), 0.0f);
const float coat_roughness = saturatef(stack_load_float(stack, coat_roughness_offset));
const float coat_ior = fmaxf(stack_load_float(stack, coat_ior_offset), 1.0f);
const float3 coat_tint = max(stack_load_float3(stack, coat_tint_offset), zero_float3());
const float transmission_weight = saturatef(
stack_load_float(stack, transmission_weight_offset));
const float anisotropic_rotation = stack_load_float(stack, anisotropic_rotation_offset);
const float ior = fmaxf(stack_load_float(stack, eta_offset), 1e-5f);
const ClosureType distribution = (ClosureType)data_node2.y;
#ifdef __SUBSURFACE__
const ClosureType subsurface_method = (ClosureType)data_node2.z;
#endif
const float3 valid_reflection_N = maybe_ensure_valid_specular_reflection(sd, N);
float3 coat_normal = stack_valid(coat_normal_offset) ?
stack_load_float3(stack, coat_normal_offset) :
sd->N;
coat_normal = safe_normalize_fallback(coat_normal, sd->N);
// get the base color
const uint4 data_base_color = read_node(kg, &offset);
float3 base_color = stack_valid(data_base_color.x) ?
stack_load_float3(stack, data_base_color.x) :
make_float3(__uint_as_float(data_base_color.y),
__uint_as_float(data_base_color.z),
__uint_as_float(data_base_color.w));
base_color = max(base_color, zero_float3());
const float3 clamped_base_color = min(base_color, one_float3());
// get the subsurface scattering data
const uint4 data_subsurf = read_node(kg, &offset);
const uint4 data_alpha_emission_thin = read_node(kg, &offset);
svm_unpack_node_uchar4(data_alpha_emission_thin.x,
&alpha_offset,
&emission_strength_offset,
&emission_offset,
&thinfilm_thickness_offset);
float alpha = stack_valid(alpha_offset) ? stack_load_float(stack, alpha_offset) :
__uint_as_float(data_alpha_emission_thin.y);
alpha = saturatef(alpha);
const float emission_strength = stack_valid(emission_strength_offset) ?
stack_load_float(stack, emission_strength_offset) :
__uint_as_float(data_alpha_emission_thin.z);
const float3 emission = stack_load_float3(stack, emission_offset) * emission_strength;
const float thinfilm_thickness = fmaxf(stack_load_float(stack, thinfilm_thickness_offset),
1e-5f);
const float thinfilm_ior = fmaxf(stack_load_float(stack, data_alpha_emission_thin.w), 1e-5f);
Spectrum weight = closure_weight * mix_weight;
float alpha_x = sqr(roughness);
float alpha_y = sqr(roughness);
if (anisotropic > 0.0f) {
const float aspect = sqrtf(1.0f - anisotropic * 0.9f);
alpha_x /= aspect;
alpha_y *= aspect;
if (anisotropic_rotation != 0.0f) {
T = rotate_around_axis(T, N, anisotropic_rotation * M_2PI_F);
}
}
#ifdef __CAUSTICS_TRICKS__
const bool reflective_caustics = (kernel_data.integrator.caustics_reflective ||
(path_flag & PATH_RAY_DIFFUSE) == 0);
const bool refractive_caustics = (kernel_data.integrator.caustics_refractive ||
(path_flag & PATH_RAY_DIFFUSE) == 0);
#else
const bool reflective_caustics = true;
const bool refractive_caustics = true;
#endif
/* Before any actual shader components, apply transparency. */
if (alpha < 1.0f) {
bsdf_transparent_setup(sd, weight * (1.0f - alpha), path_flag);
weight *= alpha;
}
/* First layer: Sheen */
if (sheen_weight > CLOSURE_WEIGHT_CUTOFF) {
ccl_private SheenBsdf *bsdf = (ccl_private SheenBsdf *)bsdf_alloc(
sd, sizeof(SheenBsdf), sheen_weight * rgb_to_spectrum(sheen_tint) * weight);
if (bsdf) {
bsdf->N = safe_normalize(mix(N, coat_normal, saturatef(coat_weight)));
bsdf->roughness = sheen_roughness;
/* setup bsdf */
const int sheen_flag = bsdf_sheen_setup(kg, sd, bsdf);
if (sheen_flag) {
sd->flag |= sheen_flag;
/* Attenuate lower layers */
const Spectrum albedo = bsdf_albedo(
kg, sd, (ccl_private ShaderClosure *)bsdf, true, false);
weight = closure_layering_weight(albedo, weight);
}
}
}
/* Second layer: Coat */
if (coat_weight > CLOSURE_WEIGHT_CUTOFF) {
coat_normal = maybe_ensure_valid_specular_reflection(sd, coat_normal);
if (reflective_caustics) {
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
sd, sizeof(MicrofacetBsdf), coat_weight * weight);
if (bsdf) {
bsdf->N = coat_normal;
bsdf->T = zero_float3();
bsdf->ior = coat_ior;
bsdf->alpha_x = bsdf->alpha_y = sqr(coat_roughness);
/* setup bsdf */
sd->flag |= bsdf_microfacet_ggx_setup(bsdf);
bsdf_microfacet_setup_fresnel_dielectric(kg, bsdf, sd);
/* Attenuate lower layers */
const Spectrum albedo = bsdf_albedo(
kg, sd, (ccl_private ShaderClosure *)bsdf, true, false);
weight = closure_layering_weight(albedo, weight);
}
}
if (!isequal(coat_tint, one_float3())) {
/* Tint is normalized to perpendicular incidence.
* Therefore, if we define the coat thickness as length 1, the length along the ray is
* t = sqrt(1+tan^2(angle(N, I))) = sqrt(1+tan^2(acos(dotNI))) = 1 / dotNI.
* From Beer's law, we have T = exp(-sigma_e * t).
* Therefore, tint = exp(-sigma_e * 1) (per def.), so -sigma_e = log(tint).
* From this, T = exp(log(tint) * t) = exp(log(tint)) ^ t = tint ^ t;
*
* Note that this is only an approximation - it assumes that the outgoing ray
* follows the same angle, and that there aren't multiple internal bounces.
* In particular, things that could be improved:
* - For transmissive materials, there should not be an outgoing path at all if the path
* is transmitted.
* - For rough materials, we could blend towards a view-independent average path length
* (e.g. 2 for diffuse reflection) for the outgoing direction.
* However, there's also an argument to be made for keeping parameters independent of
* each other for more intuitive control, in particular main roughness not affecting the
* coat.
*/
const float cosNI = dot(sd->wi, coat_normal);
/* Refract incoming direction into coat material.
* TIR is no concern here since we're always coming from the outside. */
const float cosNT = sqrtf(1.0f - sqr(1.0f / coat_ior) * (1 - sqr(cosNI)));
const float optical_depth = 1.0f / cosNT;
weight *= mix(
one_spectrum(), power(rgb_to_spectrum(coat_tint), optical_depth), coat_weight);
}
}
/* Emission (attenuated by sheen and coat) */
if (!is_zero(emission)) {
emission_setup(sd, rgb_to_spectrum(emission) * weight);
}
/* Metallic component */
if (metallic > CLOSURE_WEIGHT_CUTOFF) {
if (reflective_caustics) {
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
sd, sizeof(MicrofacetBsdf), metallic * weight);
ccl_private FresnelF82Tint *fresnel =
(bsdf != nullptr) ?
(ccl_private FresnelF82Tint *)closure_alloc_extra(sd, sizeof(FresnelF82Tint)) :
nullptr;
if (bsdf && fresnel) {
bsdf->N = valid_reflection_N;
bsdf->ior = 1.0f;
bsdf->T = T;
bsdf->alpha_x = alpha_x;
bsdf->alpha_y = alpha_y;
fresnel->f0 = rgb_to_spectrum(clamped_base_color);
const Spectrum f82 = min(specular_tint, one_spectrum());
/* setup bsdf */
sd->flag |= bsdf_microfacet_ggx_setup(bsdf);
const bool is_multiggx = (distribution == CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID);
bsdf_microfacet_setup_fresnel_f82_tint(kg, bsdf, sd, fresnel, f82, is_multiggx);
}
}
/* Attenuate other components */
weight *= (1.0f - metallic);
}
/* Transmission component */
if (transmission_weight > CLOSURE_WEIGHT_CUTOFF) {
if (reflective_caustics || refractive_caustics) {
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
sd, sizeof(MicrofacetBsdf), transmission_weight * weight);
ccl_private FresnelGeneralizedSchlick *fresnel =
(bsdf != nullptr) ? (ccl_private FresnelGeneralizedSchlick *)closure_alloc_extra(
sd, sizeof(FresnelGeneralizedSchlick)) :
nullptr;
if (bsdf && fresnel) {
bsdf->N = valid_reflection_N;
bsdf->T = zero_float3();
bsdf->alpha_x = bsdf->alpha_y = sqr(roughness);
bsdf->ior = (sd->flag & SD_BACKFACING) ? 1.0f / ior : ior;
fresnel->f0 = make_float3(F0_from_ior(ior)) * specular_tint;
fresnel->f90 = one_spectrum();
fresnel->exponent = -ior;
fresnel->reflection_tint = reflective_caustics ? one_spectrum() : zero_spectrum();
fresnel->transmission_tint = refractive_caustics ?
sqrt(rgb_to_spectrum(clamped_base_color)) :
zero_spectrum();
fresnel->thin_film.thickness = thinfilm_thickness;
fresnel->thin_film.ior = (sd->flag & SD_BACKFACING) ? thinfilm_ior / ior :
thinfilm_ior;
/* setup bsdf */
sd->flag |= bsdf_microfacet_ggx_glass_setup(bsdf);
const bool is_multiggx = (distribution == CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID);
bsdf_microfacet_setup_fresnel_generalized_schlick(kg, bsdf, sd, fresnel, is_multiggx);
}
}
/* Attenuate other components */
weight *= (1.0f - transmission_weight);
}
/* Apply IOR adjustment */
float eta = ior;
float f0 = F0_from_ior(eta);
if (specular_ior_level != 0.5f) {
f0 *= 2.0f * specular_ior_level;
eta = ior_from_F0(f0);
if (ior < 1.0f) {
eta = 1.0f / eta;
}
}
/* Specular component */
if (reflective_caustics && (eta != 1.0f || thinfilm_thickness > 0.1f)) {
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
sd, sizeof(MicrofacetBsdf), weight);
ccl_private FresnelGeneralizedSchlick *fresnel =
(bsdf != nullptr) ? (ccl_private FresnelGeneralizedSchlick *)closure_alloc_extra(
sd, sizeof(FresnelGeneralizedSchlick)) :
nullptr;
if (bsdf && fresnel) {
bsdf->N = valid_reflection_N;
bsdf->ior = eta;
bsdf->T = T;
bsdf->alpha_x = alpha_x;
bsdf->alpha_y = alpha_y;
fresnel->f0 = f0 * specular_tint;
fresnel->f90 = one_spectrum();
fresnel->exponent = -eta;
fresnel->reflection_tint = one_spectrum();
fresnel->transmission_tint = zero_spectrum();
fresnel->thin_film.thickness = thinfilm_thickness;
fresnel->thin_film.ior = thinfilm_ior;
/* setup bsdf */
sd->flag |= bsdf_microfacet_ggx_setup(bsdf);
const bool is_multiggx = (distribution == CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID);
bsdf_microfacet_setup_fresnel_generalized_schlick(kg, bsdf, sd, fresnel, is_multiggx);
/* Attenuate lower layers */
const Spectrum albedo = bsdf_albedo(
kg, sd, (ccl_private ShaderClosure *)bsdf, true, false);
weight = closure_layering_weight(albedo, weight);
}
}
/* Diffuse/Subsurface component */
#ifdef __SUBSURFACE__
ccl_private Bssrdf *bssrdf = bssrdf_alloc(
sd, rgb_to_spectrum(clamped_base_color) * subsurface_weight * weight);
if (bssrdf) {
const float3 subsurface_radius = stack_load_float3(stack, data_subsurf.y);
const float subsurface_scale = stack_load_float(stack, data_subsurf.z);
bssrdf->radius = rgb_to_spectrum(max(subsurface_radius * subsurface_scale, zero_float3()));
bssrdf->albedo = rgb_to_spectrum(clamped_base_color);
bssrdf->N = maybe_ensure_valid_specular_reflection(sd, N);
bssrdf->alpha = sqr(roughness);
/* IOR is clamped to [1.01..3.8] inside bssrdf_setup */
bssrdf->ior = eta;
/* Anisotropy is clamped to [0.0..0.9] inside bssrdf_setup */
bssrdf->anisotropy = stack_load_float(stack, data_subsurf.w);
if (subsurface_method == CLOSURE_BSSRDF_RANDOM_WALK_SKIN_ID) {
bssrdf->ior = stack_load_float(stack, data_subsurf.x);
}
/* setup bsdf */
sd->flag |= bssrdf_setup(sd, bssrdf, path_flag, subsurface_method);
}
#else
(void)data_subsurf;
#endif
ccl_private OrenNayarBsdf *bsdf = (ccl_private OrenNayarBsdf *)bsdf_alloc(
sd,
sizeof(OrenNayarBsdf),
rgb_to_spectrum(base_color) * (1.0f - subsurface_weight) * weight);
if (bsdf) {
bsdf->N = N;
const float diffuse_roughness = saturatef(
stack_load_float(stack, diffuse_roughness_offset));
/* setup bsdf */
if (diffuse_roughness < CLOSURE_WEIGHT_CUTOFF) {
sd->flag |= bsdf_diffuse_setup((ccl_private DiffuseBsdf *)bsdf);
}
else {
bsdf->roughness = diffuse_roughness;
sd->flag |= bsdf_oren_nayar_setup(sd, bsdf, rgb_to_spectrum(base_color));
}
}
break;
}
case CLOSURE_BSDF_DIFFUSE_ID: {
const Spectrum weight = closure_weight * mix_weight;
ccl_private OrenNayarBsdf *bsdf = (ccl_private OrenNayarBsdf *)bsdf_alloc(
sd, sizeof(OrenNayarBsdf), weight);
if (bsdf) {
bsdf->N = N;
const float roughness = param1;
if (roughness == 0.0f) {
sd->flag |= bsdf_diffuse_setup((ccl_private DiffuseBsdf *)bsdf);
}
else {
bsdf->roughness = roughness;
const Spectrum color = saturate(rgb_to_spectrum(stack_load_float3(stack, data_node.y)));
sd->flag |= bsdf_oren_nayar_setup(sd, bsdf, color);
}
}
break;
}
case CLOSURE_BSDF_TRANSLUCENT_ID: {
const Spectrum weight = closure_weight * mix_weight;
ccl_private DiffuseBsdf *bsdf = (ccl_private DiffuseBsdf *)bsdf_alloc(
sd, sizeof(DiffuseBsdf), weight);
if (bsdf) {
bsdf->N = maybe_ensure_valid_specular_reflection(sd, N);
sd->flag |= bsdf_translucent_setup(bsdf);
}
break;
}
case CLOSURE_BSDF_TRANSPARENT_ID: {
const Spectrum weight = closure_weight * mix_weight;
bsdf_transparent_setup(sd, weight, path_flag);
break;
}
case CLOSURE_BSDF_PHYSICAL_CONDUCTOR:
case CLOSURE_BSDF_F82_CONDUCTOR: {
#ifdef __CAUSTICS_TRICKS__
if (!kernel_data.integrator.caustics_reflective && (path_flag & PATH_RAY_DIFFUSE)) {
break;
}
#endif
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
sd, sizeof(MicrofacetBsdf), rgb_to_spectrum(make_float3(mix_weight)));
if (bsdf != nullptr) {
uint base_ior_offset;
uint edge_tint_k_offset;
uint rotation_offset;
uint tangent_offset;
svm_unpack_node_uchar4(
node.z, &base_ior_offset, &edge_tint_k_offset, &rotation_offset, &tangent_offset);
const float3 valid_reflection_N = maybe_ensure_valid_specular_reflection(sd, N);
float3 T = stack_load_float3(stack, tangent_offset);
const float anisotropy = saturatef(param2);
const float roughness = saturatef(param1);
float alpha_x = sqr(roughness);
float alpha_y = sqr(roughness);
if (anisotropy > 0.0f) {
const float aspect = sqrtf(1.0f - anisotropy * 0.9f);
alpha_x /= aspect;
alpha_y *= aspect;
const float anisotropic_rotation = stack_load_float(stack, rotation_offset);
if (anisotropic_rotation != 0.0f) {
T = rotate_around_axis(T, N, anisotropic_rotation * M_2PI_F);
}
}
bsdf->N = valid_reflection_N;
bsdf->ior = 1.0f;
bsdf->T = T;
bsdf->alpha_x = alpha_x;
bsdf->alpha_y = alpha_y;
const ClosureType distribution = (ClosureType)node.w;
/* Setup BSDF */
if (distribution == CLOSURE_BSDF_MICROFACET_BECKMANN_ID) {
sd->flag |= bsdf_microfacet_beckmann_setup(bsdf);
}
else {
sd->flag |= bsdf_microfacet_ggx_setup(bsdf);
}
const bool is_multiggx = (distribution == CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID);
if (type == CLOSURE_BSDF_PHYSICAL_CONDUCTOR) {
ccl_private FresnelConductor *fresnel = (ccl_private FresnelConductor *)
closure_alloc_extra(sd, sizeof(FresnelConductor));
const float3 n = max(stack_load_float3(stack, base_ior_offset), zero_float3());
const float3 k = max(stack_load_float3(stack, edge_tint_k_offset), zero_float3());
fresnel->n = rgb_to_spectrum(n);
fresnel->k = rgb_to_spectrum(k);
bsdf_microfacet_setup_fresnel_conductor(kg, bsdf, sd, fresnel, is_multiggx);
}
else {
ccl_private FresnelF82Tint *fresnel = (ccl_private FresnelF82Tint *)closure_alloc_extra(
sd, sizeof(FresnelF82Tint));
const float3 color = saturate(stack_load_float3(stack, base_ior_offset));
const float3 tint = saturate(stack_load_float3(stack, edge_tint_k_offset));
fresnel->f0 = rgb_to_spectrum(color);
const Spectrum f82 = rgb_to_spectrum(tint);
bsdf_microfacet_setup_fresnel_f82_tint(kg, bsdf, sd, fresnel, f82, is_multiggx);
}
}
break;
}
case CLOSURE_BSDF_RAY_PORTAL_ID: {
const Spectrum weight = closure_weight * mix_weight;
const float3 position = stack_load_float3(stack, data_node.y);
const float3 direction = stack_load_float3(stack, data_node.z);
bsdf_ray_portal_setup(sd, weight, path_flag, position, direction);
break;
}
case CLOSURE_BSDF_MICROFACET_GGX_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_ID:
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID: {
#ifdef __CAUSTICS_TRICKS__
if (!kernel_data.integrator.caustics_reflective && (path_flag & PATH_RAY_DIFFUSE)) {
break;
}
#endif
const Spectrum weight = closure_weight * mix_weight;
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
sd, sizeof(MicrofacetBsdf), weight);
if (!bsdf) {
break;
}
const float roughness = sqr(saturatef(param1));
bsdf->N = maybe_ensure_valid_specular_reflection(sd, N);
bsdf->ior = 1.0f;
/* compute roughness */
const float anisotropy = clamp(param2, -0.99f, 0.99f);
if (data_node.w == SVM_STACK_INVALID || fabsf(anisotropy) <= 1e-4f) {
/* Isotropic case. */
bsdf->T = zero_float3();
bsdf->alpha_x = roughness;
bsdf->alpha_y = roughness;
}
else {
bsdf->T = stack_load_float3(stack, data_node.w);
/* rotate tangent */
const float rotation = stack_load_float(stack, data_node.y);
if (rotation != 0.0f) {
bsdf->T = rotate_around_axis(bsdf->T, bsdf->N, rotation * M_2PI_F);
}
if (anisotropy < 0.0f) {
bsdf->alpha_x = roughness / (1.0f + anisotropy);
bsdf->alpha_y = roughness * (1.0f + anisotropy);
}
else {
bsdf->alpha_x = roughness * (1.0f - anisotropy);
bsdf->alpha_y = roughness / (1.0f - anisotropy);
}
}
/* setup bsdf */
if (type == CLOSURE_BSDF_MICROFACET_BECKMANN_ID) {
sd->flag |= bsdf_microfacet_beckmann_setup(bsdf);
}
else if (type == CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ID) {
sd->flag |= bsdf_ashikhmin_shirley_setup(bsdf);
}
else {
sd->flag |= bsdf_microfacet_ggx_setup(bsdf);
if (type == CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID) {
kernel_assert(stack_valid(data_node.z));
const Spectrum color = max(rgb_to_spectrum(stack_load_float3(stack, data_node.z)),
zero_spectrum());
bsdf_microfacet_setup_fresnel_constant(kg, bsdf, sd, color);
}
}
break;
}
case CLOSURE_BSDF_MICROFACET_GGX_REFRACTION_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID: {
#ifdef __CAUSTICS_TRICKS__
if (!kernel_data.integrator.caustics_refractive && (path_flag & PATH_RAY_DIFFUSE)) {
break;
}
#endif
const Spectrum weight = closure_weight * mix_weight;
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
sd, sizeof(MicrofacetBsdf), weight);
if (bsdf) {
bsdf->N = maybe_ensure_valid_specular_reflection(sd, N);
bsdf->T = zero_float3();
float eta = fmaxf(param2, 1e-5f);
eta = (sd->flag & SD_BACKFACING) ? 1.0f / eta : eta;
/* setup bsdf */
const float roughness = sqr(param1);
bsdf->alpha_x = roughness;
bsdf->alpha_y = roughness;
bsdf->ior = eta;
if (type == CLOSURE_BSDF_MICROFACET_BECKMANN_REFRACTION_ID) {
sd->flag |= bsdf_microfacet_beckmann_refraction_setup(bsdf);
}
else {
sd->flag |= bsdf_microfacet_ggx_refraction_setup(bsdf);
}
}
break;
}
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID: {
#ifdef __CAUSTICS_TRICKS__
const bool reflective_caustics = (kernel_data.integrator.caustics_reflective ||
(path_flag & PATH_RAY_DIFFUSE) == 0);
const bool refractive_caustics = (kernel_data.integrator.caustics_refractive ||
(path_flag & PATH_RAY_DIFFUSE) == 0);
if (!(reflective_caustics || refractive_caustics)) {
break;
}
#else
const bool reflective_caustics = true;
const bool refractive_caustics = true;
#endif
ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc(
sd, sizeof(MicrofacetBsdf), make_spectrum(mix_weight));
ccl_private FresnelGeneralizedSchlick *fresnel =
(bsdf != nullptr) ? (ccl_private FresnelGeneralizedSchlick *)closure_alloc_extra(
sd, sizeof(FresnelGeneralizedSchlick)) :
nullptr;
if (bsdf && fresnel) {
bsdf->N = maybe_ensure_valid_specular_reflection(sd, N);
bsdf->T = zero_float3();
const float ior = fmaxf(param2, 1e-5f);
bsdf->ior = (sd->flag & SD_BACKFACING) ? 1.0f / ior : ior;
bsdf->alpha_x = bsdf->alpha_y = sqr(saturatef(param1));
fresnel->f0 = make_float3(F0_from_ior(ior));
fresnel->f90 = one_spectrum();
fresnel->exponent = -ior;
const float3 color = max(stack_load_float3(stack, data_node.y), zero_float3());
fresnel->reflection_tint = reflective_caustics ? rgb_to_spectrum(color) : zero_spectrum();
fresnel->transmission_tint = refractive_caustics ? rgb_to_spectrum(color) :
zero_spectrum();
fresnel->thin_film.thickness = 0.0f;
fresnel->thin_film.ior = 0.0f;
/* setup bsdf */
if (type == CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID) {
sd->flag |= bsdf_microfacet_beckmann_glass_setup(bsdf);
}
else {
sd->flag |= bsdf_microfacet_ggx_glass_setup(bsdf);
}
const bool is_multiggx = (type == CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID);
bsdf_microfacet_setup_fresnel_generalized_schlick(kg, bsdf, sd, fresnel, is_multiggx);
}
break;
}
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID: {
const Spectrum weight = closure_weight * mix_weight;
ccl_private VelvetBsdf *bsdf = (ccl_private VelvetBsdf *)bsdf_alloc(
sd, sizeof(VelvetBsdf), weight);
if (bsdf) {
bsdf->N = N;
bsdf->sigma = saturatef(param1);
sd->flag |= bsdf_ashikhmin_velvet_setup(bsdf);
}
break;
}
case CLOSURE_BSDF_SHEEN_ID: {
const Spectrum weight = closure_weight * mix_weight;
ccl_private SheenBsdf *bsdf = (ccl_private SheenBsdf *)bsdf_alloc(
sd, sizeof(SheenBsdf), weight);
if (bsdf) {
bsdf->N = N;
bsdf->roughness = saturatef(param1);
sd->flag |= bsdf_sheen_setup(kg, sd, bsdf);
}
break;
}
case CLOSURE_BSDF_GLOSSY_TOON_ID:
#ifdef __CAUSTICS_TRICKS__
if (!kernel_data.integrator.caustics_reflective && (path_flag & PATH_RAY_DIFFUSE)) {
break;
}
ATTR_FALLTHROUGH;
#endif
case CLOSURE_BSDF_DIFFUSE_TOON_ID: {
const Spectrum weight = closure_weight * mix_weight;
ccl_private ToonBsdf *bsdf = (ccl_private ToonBsdf *)bsdf_alloc(
sd, sizeof(ToonBsdf), weight);
if (bsdf) {
bsdf->N = N;
bsdf->size = param1;
bsdf->smooth = param2;
if (type == CLOSURE_BSDF_DIFFUSE_TOON_ID) {
sd->flag |= bsdf_diffuse_toon_setup(bsdf);
}
else {
sd->flag |= bsdf_glossy_toon_setup(bsdf);
}
}
break;
}
#ifdef __HAIR__
# ifdef __PRINCIPLED_HAIR__
case CLOSURE_BSDF_HAIR_CHIANG_ID:
case CLOSURE_BSDF_HAIR_HUANG_ID: {
const uint4 data_node2 = read_node(kg, &offset);
const uint4 data_node3 = read_node(kg, &offset);
const uint4 data_node4 = read_node(kg, &offset);
const Spectrum weight = closure_weight * mix_weight;
uint offset_ofs;
uint ior_ofs;
uint color_ofs;
uint parametrization;
svm_unpack_node_uchar4(data_node.y, &offset_ofs, &ior_ofs, &color_ofs, &parametrization);
const float alpha = stack_load_float_default(stack, offset_ofs, data_node.z);
const float ior = stack_load_float_default(stack, ior_ofs, data_node.w);
uint tint_ofs;
uint melanin_ofs;
uint melanin_redness_ofs;
uint absorption_coefficient_ofs;
svm_unpack_node_uchar4(data_node2.x,
&tint_ofs,
&melanin_ofs,
&melanin_redness_ofs,
&absorption_coefficient_ofs);
uint shared_ofs1;
uint random_ofs;
uint random_color_ofs;
uint shared_ofs2;
svm_unpack_node_uchar4(
data_node3.x, &shared_ofs1, &random_ofs, &random_color_ofs, &shared_ofs2);
const AttributeDescriptor attr_descr_random = find_attribute(kg, sd, data_node2.y);
float random = 0.0f;
if (attr_descr_random.offset != ATTR_STD_NOT_FOUND) {
random = primitive_surface_attribute<float>(kg, sd, attr_descr_random, nullptr, nullptr);
}
else {
random = stack_load_float_default(stack, random_ofs, data_node3.y);
}
/* Random factors range: [-randomization/2, +randomization/2]. */
const float random_roughness = param2;
const float factor_random_roughness = 1.0f + 2.0f * (random - 0.5f) * random_roughness;
const float roughness = param1 * factor_random_roughness;
const float radial_roughness = (type == CLOSURE_BSDF_HAIR_CHIANG_ID) ?
stack_load_float_default(
stack, shared_ofs2, data_node4.y) *
factor_random_roughness :
roughness;
Spectrum sigma;
switch (parametrization) {
case NODE_PRINCIPLED_HAIR_DIRECT_ABSORPTION: {
const float3 absorption_coefficient = stack_load_float3(stack,
absorption_coefficient_ofs);
sigma = rgb_to_spectrum(absorption_coefficient);
break;
}
case NODE_PRINCIPLED_HAIR_PIGMENT_CONCENTRATION: {
float melanin = stack_load_float_default(stack, melanin_ofs, data_node2.z);
const float melanin_redness = stack_load_float_default(
stack, melanin_redness_ofs, data_node2.w);
/* Randomize melanin. */
float random_color = stack_load_float_default(stack, random_color_ofs, data_node3.z);
random_color = clamp(random_color, 0.0f, 1.0f);
const float factor_random_color = 1.0f + 2.0f * (random - 0.5f) * random_color;
melanin *= factor_random_color;
/* Map melanin 0..inf from more perceptually linear 0..1. */
melanin = -logf(fmaxf(1.0f - melanin, 0.0001f));
/* Benedikt Bitterli's melanin ratio remapping. */
const float eumelanin = melanin * (1.0f - melanin_redness);
const float pheomelanin = melanin * melanin_redness;
const Spectrum melanin_sigma = bsdf_principled_hair_sigma_from_concentration(
eumelanin, pheomelanin);
/* Optional tint. */
const float3 tint = stack_load_float3(stack, tint_ofs);
const Spectrum tint_sigma = bsdf_principled_hair_sigma_from_reflectance(
rgb_to_spectrum(tint), radial_roughness);
sigma = melanin_sigma + tint_sigma;
break;
}
case NODE_PRINCIPLED_HAIR_REFLECTANCE: {
const float3 color = stack_load_float3(stack, color_ofs);
sigma = bsdf_principled_hair_sigma_from_reflectance(rgb_to_spectrum(color),
radial_roughness);
break;
}
default: {
/* Fallback to brownish hair, same as defaults for melanin. */
kernel_assert(!"Invalid Hair parametrization!");
sigma = bsdf_principled_hair_sigma_from_concentration(0.0f, 0.8054375f);
break;
}
}
if (type == CLOSURE_BSDF_HAIR_CHIANG_ID) {
ccl_private ChiangHairBSDF *bsdf = (ccl_private ChiangHairBSDF *)bsdf_alloc(
sd, sizeof(ChiangHairBSDF), weight);
if (bsdf) {
/* Remap Coat value to [0, 100]% of Roughness. */
const float coat = stack_load_float_default(stack, shared_ofs1, data_node3.w);
const float m0_roughness = 1.0f - clamp(coat, 0.0f, 1.0f);
bsdf->v = roughness;
bsdf->s = radial_roughness;
bsdf->m0_roughness = m0_roughness;
bsdf->alpha = alpha;
bsdf->eta = ior;
bsdf->sigma = sigma;
sd->flag |= bsdf_hair_chiang_setup(sd, bsdf);
}
}
else {
kernel_assert(type == CLOSURE_BSDF_HAIR_HUANG_ID);
uint R_ofs;
uint TT_ofs;
uint TRT_ofs;
uint unused;
svm_unpack_node_uchar4(data_node4.x, &R_ofs, &TT_ofs, &TRT_ofs, &unused);
const float R = stack_load_float_default(stack, R_ofs, data_node4.y);
const float TT = stack_load_float_default(stack, TT_ofs, data_node4.z);
const float TRT = stack_load_float_default(stack, TRT_ofs, data_node4.w);
if (R <= 0.0f && TT <= 0.0f && TRT <= 0.0f) {
break;
}
ccl_private HuangHairBSDF *bsdf = (ccl_private HuangHairBSDF *)bsdf_alloc(
sd, sizeof(HuangHairBSDF), weight);
if (bsdf) {
ccl_private HuangHairExtra *extra = (ccl_private HuangHairExtra *)closure_alloc_extra(
sd, sizeof(HuangHairExtra));
if (!extra) {
break;
}
bsdf->extra = extra;
bsdf->extra->R = fmaxf(0.0f, R);
bsdf->extra->TT = fmaxf(0.0f, TT);
bsdf->extra->TRT = fmaxf(0.0f, TRT);
bsdf->extra->pixel_coverage = 1.0f;
/* For camera ray, check if the hair covers more than one pixel, in which case a
* nearfield model is needed to prevent ribbon-like appearance. */
if ((path_flag & PATH_RAY_CAMERA) && (sd->type & PRIMITIVE_CURVE)) {
/* Interpolate radius between curve keys. */
const KernelCurve kcurve = kernel_data_fetch(curves, sd->prim);
const int k0 = kcurve.first_key + PRIMITIVE_UNPACK_SEGMENT(sd->type);
const int k1 = k0 + 1;
const float radius = mix(
kernel_data_fetch(curve_keys, k0).w, kernel_data_fetch(curve_keys, k1).w, sd->u);
bsdf->extra->pixel_coverage = 0.5f * sd->dP / radius;
}
bsdf->aspect_ratio = stack_load_float_default(stack, shared_ofs1, data_node3.w);
if (bsdf->aspect_ratio != 1.0f) {
/* Align ellipse major axis with the curve normal direction. */
const AttributeDescriptor attr_descr_normal = find_attribute(kg, sd, shared_ofs2);
bsdf->N = curve_attribute<float3>(kg, sd, attr_descr_normal, nullptr, nullptr);
}
bsdf->roughness = roughness;
bsdf->tilt = alpha;
bsdf->eta = ior;
bsdf->sigma = sigma;
sd->flag |= bsdf_hair_huang_setup(sd, bsdf, path_flag);
}
}
break;
}
# endif /* __PRINCIPLED_HAIR__ */
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID: {
const Spectrum weight = closure_weight * mix_weight;
ccl_private HairBsdf *bsdf = (ccl_private HairBsdf *)bsdf_alloc(
sd, sizeof(HairBsdf), weight);
if (bsdf) {
bsdf->N = maybe_ensure_valid_specular_reflection(sd, N);
bsdf->roughness1 = param1;
bsdf->roughness2 = param2;
bsdf->offset = -stack_load_float(stack, data_node.y);
if (stack_valid(data_node.w)) {
bsdf->T = normalize(stack_load_float3(stack, data_node.w));
}
else if (!(sd->type & PRIMITIVE_CURVE)) {
bsdf->T = normalize(sd->dPdv);
bsdf->offset = 0.0f;
}
else {
bsdf->T = normalize(sd->dPdu);
}
if (type == CLOSURE_BSDF_HAIR_REFLECTION_ID) {
sd->flag |= bsdf_hair_reflection_setup(bsdf);
}
else {
sd->flag |= bsdf_hair_transmission_setup(bsdf);
}
}
break;
}
#endif /* __HAIR__ */
#ifdef __SUBSURFACE__
case CLOSURE_BSSRDF_BURLEY_ID:
case CLOSURE_BSSRDF_RANDOM_WALK_ID:
case CLOSURE_BSSRDF_RANDOM_WALK_SKIN_ID: {
const Spectrum weight = closure_weight * mix_weight;
ccl_private Bssrdf *bssrdf = bssrdf_alloc(sd, weight);
if (bssrdf) {
bssrdf->radius = max(rgb_to_spectrum(stack_load_float3(stack, data_node.y) * param1),
zero_spectrum());
bssrdf->albedo = closure_weight;
bssrdf->N = maybe_ensure_valid_specular_reflection(sd, N);
bssrdf->ior = param2;
bssrdf->alpha = saturatef(stack_load_float(stack, data_node.w));
bssrdf->anisotropy = stack_load_float(stack, data_node.z);
sd->flag |= bssrdf_setup(sd, bssrdf, path_flag, (ClosureType)type);
}
break;
}
#endif
default:
break;
}
return offset;
}
ccl_device_inline void svm_alloc_closure_volume_scatter(ccl_private ShaderData *sd,
ccl_private float *stack,
Spectrum weight,
const uint type,
const uint param1_offset,
const uint param_extra)
{
switch (type) {
case CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID: {
ccl_private HenyeyGreensteinVolume *volume = (ccl_private HenyeyGreensteinVolume *)
bsdf_alloc(sd, sizeof(HenyeyGreensteinVolume), weight);
if (volume) {
volume->g = stack_valid(param1_offset) ? stack_load_float(stack, param1_offset) :
__uint_as_float(param_extra);
sd->flag |= volume_henyey_greenstein_setup(volume);
}
} break;
case CLOSURE_VOLUME_FOURNIER_FORAND_ID: {
ccl_private FournierForandVolume *volume = (ccl_private FournierForandVolume *)bsdf_alloc(
sd, sizeof(FournierForandVolume), weight);
if (volume) {
const float IOR = stack_load_float(stack, param1_offset);
const float B = stack_load_float(stack, param_extra);
sd->flag |= volume_fournier_forand_setup(volume, B, IOR);
}
} break;
case CLOSURE_VOLUME_RAYLEIGH_ID: {
ccl_private RayleighVolume *volume = (ccl_private RayleighVolume *)bsdf_alloc(
sd, sizeof(RayleighVolume), weight);
if (volume) {
sd->flag |= volume_rayleigh_setup(volume);
}
break;
}
case CLOSURE_VOLUME_DRAINE_ID: {
ccl_private DraineVolume *volume = (ccl_private DraineVolume *)bsdf_alloc(
sd, sizeof(DraineVolume), weight);
if (volume) {
volume->g = stack_load_float(stack, param1_offset);
volume->alpha = stack_load_float(stack, param_extra);
sd->flag |= volume_draine_setup(volume);
}
} break;
case CLOSURE_VOLUME_MIE_ID: {
const float d = stack_valid(param1_offset) ? stack_load_float(stack, param1_offset) :
__uint_as_float(param_extra);
float g_HG;
float g_D;
float alpha;
float mixture;
phase_mie_fitted_parameters(d, &g_HG, &g_D, &alpha, &mixture);
ccl_private HenyeyGreensteinVolume *hg = (ccl_private HenyeyGreensteinVolume *)bsdf_alloc(
sd, sizeof(HenyeyGreensteinVolume), weight * (1.0f - mixture));
if (hg) {
hg->g = g_HG;
sd->flag |= volume_henyey_greenstein_setup(hg);
}
ccl_private DraineVolume *draine = (ccl_private DraineVolume *)bsdf_alloc(
sd, sizeof(DraineVolume), weight * mixture);
if (draine) {
draine->g = g_D;
draine->alpha = alpha;
sd->flag |= volume_draine_setup(draine);
}
} break;
default: {
kernel_assert(0);
break;
}
}
}
template<ShaderType shader_type>
ccl_device_noinline void svm_node_closure_volume(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
Spectrum closure_weight,
const uint4 node)
{
#ifdef __VOLUME__
/* Only sum extinction for volumes, variable is shared with surface transparency. */
if (shader_type != SHADER_TYPE_VOLUME) {
return;
}
uint type;
uint density_offset;
uint param1_offset;
uint mix_weight_offset;
svm_unpack_node_uchar4(node.y, &type, &density_offset, &param1_offset, &mix_weight_offset);
const float mix_weight = (stack_valid(mix_weight_offset) ?
stack_load_float(stack, mix_weight_offset) :
1.0f);
if (mix_weight == 0.0f) {
return;
}
float density = (stack_valid(density_offset)) ? stack_load_float(stack, density_offset) :
__uint_as_float(node.z);
density = mix_weight * fmaxf(density, 0.0f) * object_volume_density(kg, sd->object);
/* Compute scattering coefficient. */
Spectrum weight = closure_weight;
if (type == CLOSURE_VOLUME_ABSORPTION_ID) {
weight = one_spectrum() - weight;
}
weight *= density;
/* Add closure for volume scattering. */
if (CLOSURE_IS_VOLUME_SCATTER(type)) {
svm_alloc_closure_volume_scatter(sd, stack, weight, type, param1_offset, node.w);
}
/* Sum total extinction weight. */
volume_extinction_setup(sd, weight);
#endif
}
template<ShaderType shader_type>
ccl_device_noinline void svm_node_volume_coefficients(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
Spectrum scatter_coeffs,
const uint4 node,
const uint32_t path_flag)
{
#ifdef __VOLUME__
/* Only sum extinction for volumes, variable is shared with surface transparency. */
if (shader_type != SHADER_TYPE_VOLUME) {
return;
}
uint type;
uint empty_offset;
uint param1_offset;
uint mix_weight_offset;
svm_unpack_node_uchar4(node.y, &type, &empty_offset, &param1_offset, &mix_weight_offset);
const float mix_weight = (stack_valid(mix_weight_offset) ?
stack_load_float(stack, mix_weight_offset) :
1.0f);
if (mix_weight == 0.0f) {
return;
}
/* Compute scattering coefficient. */
const float weight = mix_weight * object_volume_density(kg, sd->object);
/* Add closure for volume scattering. */
if (!is_zero(scatter_coeffs) && CLOSURE_IS_VOLUME_SCATTER(type)) {
svm_alloc_closure_volume_scatter(
sd, stack, weight * scatter_coeffs, type, param1_offset, node.z);
}
uint absorption_coeffs_offset;
uint emission_coeffs_offset;
svm_unpack_node_uchar4(
node.w, &absorption_coeffs_offset, &emission_coeffs_offset, &empty_offset, &empty_offset);
const float3 absorption_coeffs = stack_load_float3(stack, absorption_coeffs_offset);
volume_extinction_setup(sd, weight * (scatter_coeffs + absorption_coeffs));
const float3 emission_coeffs = stack_load_float3(stack, emission_coeffs_offset);
/* Compute emission. */
if (path_flag & PATH_RAY_SHADOW) {
/* Don't need emission for shadows. */
return;
}
if (is_zero(emission_coeffs)) {
return;
}
emission_setup(sd, weight * emission_coeffs);
#endif
}
template<ShaderType shader_type>
ccl_device_noinline int svm_node_principled_volume(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
const Spectrum closure_weight,
const uint4 node,
const uint32_t path_flag,
int offset)
{
#ifdef __VOLUME__
const uint4 value_node = read_node(kg, &offset);
const uint4 attr_node = read_node(kg, &offset);
/* Only sum extinction for volumes, variable is shared with surface transparency. */
if (shader_type != SHADER_TYPE_VOLUME) {
return offset;
}
uint density_offset;
uint anisotropy_offset;
uint absorption_color_offset;
uint mix_weight_offset;
svm_unpack_node_uchar4(
node.y, &density_offset, &anisotropy_offset, &absorption_color_offset, &mix_weight_offset);
const float mix_weight = (stack_valid(mix_weight_offset) ?
stack_load_float(stack, mix_weight_offset) :
1.0f);
if (mix_weight == 0.0f) {
return offset;
}
/* Compute density. */
const float weight = mix_weight * object_volume_density(kg, sd->object);
float primitive_density = 1.0f;
float density = (stack_valid(density_offset)) ? stack_load_float(stack, density_offset) :
__uint_as_float(value_node.x);
density = weight * fmaxf(density, 0.0f);
if (density > 0.0f) {
/* Density and color attribute lookup if available. */
const AttributeDescriptor attr_density = find_attribute(kg, sd, attr_node.x);
if (attr_density.offset != ATTR_STD_NOT_FOUND) {
primitive_density = primitive_volume_attribute<float>(kg, sd, attr_density);
density = fmaxf(density * primitive_density, 0.0f);
}
}
if (density > 0.0f) {
/* Compute scattering color. */
Spectrum color = closure_weight;
const AttributeDescriptor attr_color = find_attribute(kg, sd, attr_node.y);
if (attr_color.offset != ATTR_STD_NOT_FOUND) {
color *= rgb_to_spectrum(primitive_volume_attribute<float3>(kg, sd, attr_color));
}
/* Add closure for volume scattering. */
ccl_private HenyeyGreensteinVolume *volume = (ccl_private HenyeyGreensteinVolume *)bsdf_alloc(
sd, sizeof(HenyeyGreensteinVolume), color * density);
if (volume) {
const float anisotropy = (stack_valid(anisotropy_offset)) ?
stack_load_float(stack, anisotropy_offset) :
__uint_as_float(value_node.y);
volume->g = anisotropy;
sd->flag |= volume_henyey_greenstein_setup(volume);
}
/* Add extinction weight. */
const float3 absorption_color = max(sqrt(stack_load_float3(stack, absorption_color_offset)),
zero_float3());
const Spectrum zero = zero_spectrum();
const Spectrum one = one_spectrum();
const Spectrum absorption = max(one - color, zero) *
max(one - rgb_to_spectrum(absorption_color), zero);
volume_extinction_setup(sd, (color + absorption) * density);
}
/* Compute emission. */
if (path_flag & PATH_RAY_SHADOW) {
/* Don't need emission for shadows. */
return offset;
}
uint emission_offset;
uint emission_color_offset;
uint blackbody_offset;
uint temperature_offset;
svm_unpack_node_uchar4(
node.z, &emission_offset, &emission_color_offset, &blackbody_offset, &temperature_offset);
const float emission = (stack_valid(emission_offset)) ?
stack_load_float(stack, emission_offset) :
__uint_as_float(value_node.z);
const float blackbody = (stack_valid(blackbody_offset)) ?
stack_load_float(stack, blackbody_offset) :
__uint_as_float(value_node.w);
if (emission > 0.0f) {
const float3 emission_color = stack_load_float3(stack, emission_color_offset);
emission_setup(sd, rgb_to_spectrum(emission * emission_color * weight));
}
if (blackbody > 0.0f) {
float T = stack_load_float(stack, temperature_offset);
/* Add flame temperature from attribute if available. */
const AttributeDescriptor attr_temperature = find_attribute(kg, sd, attr_node.z);
if (attr_temperature.offset != ATTR_STD_NOT_FOUND) {
const float temperature = primitive_volume_attribute<float>(kg, sd, attr_temperature);
T *= fmaxf(temperature, 0.0f);
}
T = fmaxf(T, 0.0f);
/* Stefan-Boltzmann law. */
const float T4 = sqr(sqr(T));
const float sigma = 5.670373e-8f * 1e-6f / M_PI_F;
const float intensity = sigma * mix(1.0f, T4, blackbody);
if (intensity > 0.0f) {
const float3 blackbody_tint = stack_load_float3(stack, node.w);
const float3 bb = blackbody_tint * intensity *
rec709_to_rgb(kg, svm_math_blackbody_color_rec709(T));
emission_setup(sd, rgb_to_spectrum(bb * weight));
}
}
#endif
return offset;
}
ccl_device_noinline void svm_node_closure_emission(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
Spectrum closure_weight,
const uint4 node)
{
const uint mix_weight_offset = node.y;
Spectrum weight = closure_weight;
if (stack_valid(mix_weight_offset)) {
const float mix_weight = stack_load_float(stack, mix_weight_offset);
if (mix_weight == 0.0f) {
return;
}
weight *= mix_weight;
}
if (sd->flag & SD_IS_VOLUME_SHADER_EVAL) {
weight *= object_volume_density(kg, sd->object);
}
emission_setup(sd, weight);
}
ccl_device_noinline void svm_node_closure_background(ccl_private ShaderData *sd,
ccl_private float *stack,
Spectrum closure_weight,
const uint4 node)
{
const uint mix_weight_offset = node.y;
Spectrum weight = closure_weight;
if (stack_valid(mix_weight_offset)) {
const float mix_weight = stack_load_float(stack, mix_weight_offset);
if (mix_weight == 0.0f) {
return;
}
weight *= mix_weight;
}
background_setup(sd, weight);
}
ccl_device_noinline void svm_node_closure_holdout(ccl_private ShaderData *sd,
ccl_private float *stack,
Spectrum closure_weight,
const uint4 node)
{
const uint mix_weight_offset = node.y;
if (stack_valid(mix_weight_offset)) {
const float mix_weight = stack_load_float(stack, mix_weight_offset);
if (mix_weight == 0.0f) {
return;
}
closure_alloc(sd, sizeof(ShaderClosure), CLOSURE_HOLDOUT_ID, closure_weight * mix_weight);
}
else {
closure_alloc(sd, sizeof(ShaderClosure), CLOSURE_HOLDOUT_ID, closure_weight);
}
sd->flag |= SD_HOLDOUT;
}
/* Closure Nodes */
ccl_device void svm_node_closure_set_weight(ccl_private ShaderData *sd,
ccl_private Spectrum *closure_weight,
const uint r,
uint g,
const uint b)
{
*closure_weight = rgb_to_spectrum(
make_float3(__uint_as_float(r), __uint_as_float(g), __uint_as_float(b)));
}
ccl_device void svm_node_closure_weight(ccl_private ShaderData *sd,
ccl_private float *stack,
ccl_private Spectrum *closure_weight,
const uint weight_offset)
{
*closure_weight = rgb_to_spectrum(stack_load_float3(stack, weight_offset));
}
ccl_device_noinline void svm_node_emission_weight(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
ccl_private Spectrum *closure_weight,
const uint4 node)
{
const uint color_offset = node.y;
const uint strength_offset = node.z;
const float strength = stack_load_float(stack, strength_offset);
*closure_weight = rgb_to_spectrum(stack_load_float3(stack, color_offset)) * strength;
}
ccl_device_noinline void svm_node_mix_closure(ccl_private ShaderData *sd,
ccl_private float *stack,
const uint4 node)
{
/* fetch weight from blend input, previous mix closures,
* and write to stack to be used by closure nodes later */
uint weight_offset;
uint in_weight_offset;
uint weight1_offset;
uint weight2_offset;
svm_unpack_node_uchar4(
node.y, &weight_offset, &in_weight_offset, &weight1_offset, &weight2_offset);
float weight = stack_load_float(stack, weight_offset);
weight = saturatef(weight);
const float in_weight = (stack_valid(in_weight_offset)) ?
stack_load_float(stack, in_weight_offset) :
1.0f;
if (stack_valid(weight1_offset)) {
stack_store_float(stack, weight1_offset, in_weight * (1.0f - weight));
}
if (stack_valid(weight2_offset)) {
stack_store_float(stack, weight2_offset, in_weight * weight);
}
}
/* (Bump) normal */
ccl_device void svm_node_set_normal(KernelGlobals kg,
ccl_private ShaderData *sd,
ccl_private float *stack,
const uint in_direction,
const uint out_normal)
{
const float3 normal = stack_load_float3(stack, in_direction);
sd->N = normal;
stack_store_float3(stack, out_normal, normal);
}
CCL_NAMESPACE_END
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