blender/intern/cycles/kernel/svm/svm_closure.h
Lukas Stockner 799779d432 Cycles: change Ambient Occlusion shader to output colors.
This means the shader can now be used for procedural texturing. New
settings on the node are Samples, Inside, Local Only and Distance.

Original patch by Lukas with further changes by Brecht.

Differential Revision: https://developer.blender.org/D3479
2018-06-15 22:16:06 +02:00

1059 lines
34 KiB
C

/*
* Copyright 2011-2013 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
CCL_NAMESPACE_BEGIN
/* Closure Nodes */
ccl_device void svm_node_glass_setup(ShaderData *sd, MicrofacetBsdf *bsdf, int type, float eta, float roughness, bool refract)
{
if(type == CLOSURE_BSDF_SHARP_GLASS_ID) {
if(refract) {
bsdf->alpha_y = 0.0f;
bsdf->alpha_x = 0.0f;
bsdf->ior = eta;
sd->flag |= bsdf_refraction_setup(bsdf);
}
else {
bsdf->alpha_y = 0.0f;
bsdf->alpha_x = 0.0f;
bsdf->ior = 0.0f;
sd->flag |= bsdf_reflection_setup(bsdf);
}
}
else if(type == CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID) {
bsdf->alpha_x = roughness;
bsdf->alpha_y = roughness;
bsdf->ior = eta;
if(refract)
sd->flag |= bsdf_microfacet_beckmann_refraction_setup(bsdf);
else
sd->flag |= bsdf_microfacet_beckmann_setup(bsdf);
}
else {
bsdf->alpha_x = roughness;
bsdf->alpha_y = roughness;
bsdf->ior = eta;
if(refract)
sd->flag |= bsdf_microfacet_ggx_refraction_setup(bsdf);
else
sd->flag |= bsdf_microfacet_ggx_setup(bsdf);
}
}
ccl_device void svm_node_closure_bsdf(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, ShaderType shader_type, int path_flag, int *offset)
{
uint type, param1_offset, param2_offset;
uint mix_weight_offset;
decode_node_uchar4(node.y, &type, &param1_offset, &param2_offset, &mix_weight_offset);
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 */
uint4 data_node = read_node(kg, offset);
/* Only compute BSDF for surfaces, transparent variable is shared with volume extinction. */
if(mix_weight == 0.0f || shader_type != SHADER_TYPE_SURFACE) {
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;
}
float3 N = stack_valid(data_node.x)? stack_load_float3(stack, data_node.x): sd->N;
float param1 = (stack_valid(param1_offset))? stack_load_float(stack, param1_offset): __uint_as_float(node.z);
float param2 = (stack_valid(param2_offset))? stack_load_float(stack, param2_offset): __uint_as_float(node.w);
switch(type) {
#ifdef __PRINCIPLED__
case CLOSURE_BSDF_PRINCIPLED_ID: {
uint specular_offset, roughness_offset, specular_tint_offset, anisotropic_offset, sheen_offset,
sheen_tint_offset, clearcoat_offset, clearcoat_roughness_offset, eta_offset, transmission_offset,
anisotropic_rotation_offset, transmission_roughness_offset;
uint4 data_node2 = read_node(kg, offset);
float3 T = stack_load_float3(stack, data_node.y);
decode_node_uchar4(data_node.z, &specular_offset, &roughness_offset, &specular_tint_offset, &anisotropic_offset);
decode_node_uchar4(data_node.w, &sheen_offset, &sheen_tint_offset, &clearcoat_offset, &clearcoat_roughness_offset);
decode_node_uchar4(data_node2.x, &eta_offset, &transmission_offset, &anisotropic_rotation_offset, &transmission_roughness_offset);
// get Disney principled parameters
float metallic = param1;
float subsurface = param2;
float specular = stack_load_float(stack, specular_offset);
float roughness = stack_load_float(stack, roughness_offset);
float specular_tint = stack_load_float(stack, specular_tint_offset);
float anisotropic = stack_load_float(stack, anisotropic_offset);
float sheen = stack_load_float(stack, sheen_offset);
float sheen_tint = stack_load_float(stack, sheen_tint_offset);
float clearcoat = stack_load_float(stack, clearcoat_offset);
float clearcoat_roughness = stack_load_float(stack, clearcoat_roughness_offset);
float transmission = stack_load_float(stack, transmission_offset);
float anisotropic_rotation = stack_load_float(stack, anisotropic_rotation_offset);
float transmission_roughness = stack_load_float(stack, transmission_roughness_offset);
float eta = fmaxf(stack_load_float(stack, eta_offset), 1e-5f);
ClosureType distribution = (ClosureType) data_node2.y;
ClosureType subsurface_method = (ClosureType) data_node2.z;
/* rotate tangent */
if(anisotropic_rotation != 0.0f)
T = rotate_around_axis(T, N, anisotropic_rotation * M_2PI_F);
/* calculate ior */
float ior = (sd->flag & SD_BACKFACING) ? 1.0f / eta : eta;
// calculate fresnel for refraction
float cosNO = dot(N, sd->I);
float fresnel = fresnel_dielectric_cos(cosNO, ior);
// calculate weights of the diffuse and specular part
float diffuse_weight = (1.0f - saturate(metallic)) * (1.0f - saturate(transmission));
float final_transmission = saturate(transmission) * (1.0f - saturate(metallic));
float specular_weight = (1.0f - final_transmission);
// get the base color
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));
// get the additional clearcoat normal and subsurface scattering radius
uint4 data_cn_ssr = read_node(kg, offset);
float3 clearcoat_normal = stack_valid(data_cn_ssr.x) ? stack_load_float3(stack, data_cn_ssr.x) : sd->N;
float3 subsurface_radius = stack_valid(data_cn_ssr.y) ? stack_load_float3(stack, data_cn_ssr.y) : make_float3(1.0f, 1.0f, 1.0f);
// get the subsurface color
uint4 data_subsurface_color = read_node(kg, offset);
float3 subsurface_color = stack_valid(data_subsurface_color.x) ? stack_load_float3(stack, data_subsurface_color.x) :
make_float3(__uint_as_float(data_subsurface_color.y), __uint_as_float(data_subsurface_color.z), __uint_as_float(data_subsurface_color.w));
float3 weight = sd->svm_closure_weight * mix_weight;
#ifdef __SUBSURFACE__
float3 mixed_ss_base_color = subsurface_color * subsurface + base_color * (1.0f - subsurface);
float3 subsurf_weight = weight * mixed_ss_base_color * diffuse_weight;
/* disable in case of diffuse ancestor, can't see it well then and
* adds considerably noise due to probabilities of continuing path
* getting lower and lower */
if(path_flag & PATH_RAY_DIFFUSE_ANCESTOR) {
subsurface = 0.0f;
/* need to set the base color in this case such that the
* rays get the correctly mixed color after transmitting
* the object */
base_color = mixed_ss_base_color;
}
/* diffuse */
if(fabsf(average(mixed_ss_base_color)) > CLOSURE_WEIGHT_CUTOFF) {
if(subsurface <= CLOSURE_WEIGHT_CUTOFF && diffuse_weight > CLOSURE_WEIGHT_CUTOFF) {
float3 diff_weight = weight * base_color * diffuse_weight;
PrincipledDiffuseBsdf *bsdf = (PrincipledDiffuseBsdf*)bsdf_alloc(sd, sizeof(PrincipledDiffuseBsdf), diff_weight);
if(bsdf) {
bsdf->N = N;
bsdf->roughness = roughness;
/* setup bsdf */
sd->flag |= bsdf_principled_diffuse_setup(bsdf);
}
}
else if(subsurface > CLOSURE_WEIGHT_CUTOFF) {
Bssrdf *bssrdf = bssrdf_alloc(sd, subsurf_weight);
if(bssrdf) {
bssrdf->radius = subsurface_radius * subsurface;
bssrdf->albedo = (subsurface_method == CLOSURE_BSSRDF_PRINCIPLED_ID)? subsurface_color: mixed_ss_base_color;
bssrdf->texture_blur = 0.0f;
bssrdf->sharpness = 0.0f;
bssrdf->N = N;
bssrdf->roughness = roughness;
/* setup bsdf */
sd->flag |= bssrdf_setup(sd, bssrdf, subsurface_method);
}
}
}
#else
/* diffuse */
if(diffuse_weight > CLOSURE_WEIGHT_CUTOFF) {
float3 diff_weight = weight * base_color * diffuse_weight;
PrincipledDiffuseBsdf *bsdf = (PrincipledDiffuseBsdf*)bsdf_alloc(sd, sizeof(PrincipledDiffuseBsdf), diff_weight);
if(bsdf) {
bsdf->N = N;
bsdf->roughness = roughness;
/* setup bsdf */
sd->flag |= bsdf_principled_diffuse_setup(bsdf);
}
}
#endif
/* sheen */
if(diffuse_weight > CLOSURE_WEIGHT_CUTOFF && sheen > CLOSURE_WEIGHT_CUTOFF) {
float m_cdlum = linear_rgb_to_gray(kg, base_color);
float3 m_ctint = m_cdlum > 0.0f ? base_color / m_cdlum : make_float3(1.0f, 1.0f, 1.0f); // normalize lum. to isolate hue+sat
/* color of the sheen component */
float3 sheen_color = make_float3(1.0f, 1.0f, 1.0f) * (1.0f - sheen_tint) + m_ctint * sheen_tint;
float3 sheen_weight = weight * sheen * sheen_color * diffuse_weight;
PrincipledSheenBsdf *bsdf = (PrincipledSheenBsdf*)bsdf_alloc(sd, sizeof(PrincipledSheenBsdf), sheen_weight);
if(bsdf) {
bsdf->N = N;
/* setup bsdf */
sd->flag |= bsdf_principled_sheen_setup(bsdf);
}
}
/* specular reflection */
#ifdef __CAUSTICS_TRICKS__
if(kernel_data.integrator.caustics_reflective || (path_flag & PATH_RAY_DIFFUSE) == 0) {
#endif
if(specular_weight > CLOSURE_WEIGHT_CUTOFF && (specular > CLOSURE_WEIGHT_CUTOFF || metallic > CLOSURE_WEIGHT_CUTOFF)) {
float3 spec_weight = weight * specular_weight;
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), spec_weight);
if(!bsdf){
break;
}
MicrofacetExtra *extra = (MicrofacetExtra*)closure_alloc_extra(sd, sizeof(MicrofacetExtra));
if(!extra) {
break;
}
bsdf->N = N;
bsdf->ior = (2.0f / (1.0f - safe_sqrtf(0.08f * specular))) - 1.0f;
bsdf->T = T;
bsdf->extra = extra;
float aspect = safe_sqrtf(1.0f - anisotropic * 0.9f);
float r2 = roughness * roughness;
bsdf->alpha_x = r2 / aspect;
bsdf->alpha_y = r2 * aspect;
float m_cdlum = 0.3f * base_color.x + 0.6f * base_color.y + 0.1f * base_color.z; // luminance approx.
float3 m_ctint = m_cdlum > 0.0f ? base_color / m_cdlum : make_float3(0.0f, 0.0f, 0.0f); // normalize lum. to isolate hue+sat
float3 tmp_col = make_float3(1.0f, 1.0f, 1.0f) * (1.0f - specular_tint) + m_ctint * specular_tint;
bsdf->extra->cspec0 = (specular * 0.08f * tmp_col) * (1.0f - metallic) + base_color * metallic;
bsdf->extra->color = base_color;
bsdf->extra->clearcoat = 0.0f;
/* setup bsdf */
if(distribution == CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID || roughness <= 0.075f) /* use single-scatter GGX */
sd->flag |= bsdf_microfacet_ggx_aniso_fresnel_setup(bsdf, sd);
else /* use multi-scatter GGX */
sd->flag |= bsdf_microfacet_multi_ggx_aniso_fresnel_setup(bsdf, sd);
}
#ifdef __CAUSTICS_TRICKS__
}
#endif
/* BSDF */
#ifdef __CAUSTICS_TRICKS__
if(kernel_data.integrator.caustics_reflective || kernel_data.integrator.caustics_refractive || (path_flag & PATH_RAY_DIFFUSE) == 0) {
#endif
if(final_transmission > CLOSURE_WEIGHT_CUTOFF) {
float3 glass_weight = weight * final_transmission;
float3 cspec0 = base_color * specular_tint + make_float3(1.0f, 1.0f, 1.0f) * (1.0f - specular_tint);
if(roughness <= 5e-2f || distribution == CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID) { /* use single-scatter GGX */
float refl_roughness = roughness;
/* reflection */
#ifdef __CAUSTICS_TRICKS__
if(kernel_data.integrator.caustics_reflective || (path_flag & PATH_RAY_DIFFUSE) == 0)
#endif
{
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), glass_weight*fresnel);
if(!bsdf) {
break;
}
MicrofacetExtra *extra = (MicrofacetExtra*)closure_alloc_extra(sd, sizeof(MicrofacetExtra));
if(!extra) {
break;
}
bsdf->N = N;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra = extra;
bsdf->alpha_x = refl_roughness * refl_roughness;
bsdf->alpha_y = refl_roughness * refl_roughness;
bsdf->ior = ior;
bsdf->extra->color = base_color;
bsdf->extra->cspec0 = cspec0;
bsdf->extra->clearcoat = 0.0f;
/* setup bsdf */
sd->flag |= bsdf_microfacet_ggx_fresnel_setup(bsdf, sd);
}
/* refraction */
#ifdef __CAUSTICS_TRICKS__
if(kernel_data.integrator.caustics_refractive || (path_flag & PATH_RAY_DIFFUSE) == 0)
#endif
{
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), base_color*glass_weight*(1.0f - fresnel));
if(!bsdf) {
break;
}
bsdf->N = N;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra = NULL;
if(distribution == CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID)
transmission_roughness = 1.0f - (1.0f - refl_roughness) * (1.0f - transmission_roughness);
else
transmission_roughness = refl_roughness;
bsdf->alpha_x = transmission_roughness * transmission_roughness;
bsdf->alpha_y = transmission_roughness * transmission_roughness;
bsdf->ior = ior;
/* setup bsdf */
sd->flag |= bsdf_microfacet_ggx_refraction_setup(bsdf);
}
}
else { /* use multi-scatter GGX */
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), glass_weight);
if(!bsdf) {
break;
}
MicrofacetExtra *extra = (MicrofacetExtra*)closure_alloc_extra(sd, sizeof(MicrofacetExtra));
if(!extra) {
break;
}
bsdf->N = N;
bsdf->extra = extra;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
bsdf->alpha_x = roughness * roughness;
bsdf->alpha_y = roughness * roughness;
bsdf->ior = ior;
bsdf->extra->color = base_color;
bsdf->extra->cspec0 = cspec0;
bsdf->extra->clearcoat = 0.0f;
/* setup bsdf */
sd->flag |= bsdf_microfacet_multi_ggx_glass_fresnel_setup(bsdf, sd);
}
}
#ifdef __CAUSTICS_TRICKS__
}
#endif
/* clearcoat */
#ifdef __CAUSTICS_TRICKS__
if(kernel_data.integrator.caustics_reflective || (path_flag & PATH_RAY_DIFFUSE) == 0) {
#endif
if(clearcoat > CLOSURE_WEIGHT_CUTOFF) {
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), weight);
if(!bsdf) {
break;
}
MicrofacetExtra *extra = (MicrofacetExtra*)closure_alloc_extra(sd, sizeof(MicrofacetExtra));
if(!extra) {
break;
}
bsdf->N = clearcoat_normal;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
bsdf->ior = 1.5f;
bsdf->extra = extra;
bsdf->alpha_x = clearcoat_roughness * clearcoat_roughness;
bsdf->alpha_y = clearcoat_roughness * clearcoat_roughness;
bsdf->extra->color = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra->cspec0 = make_float3(0.04f, 0.04f, 0.04f);
bsdf->extra->clearcoat = clearcoat;
/* setup bsdf */
sd->flag |= bsdf_microfacet_ggx_clearcoat_setup(bsdf, sd);
}
#ifdef __CAUSTICS_TRICKS__
}
#endif
break;
}
#endif /* __PRINCIPLED__ */
case CLOSURE_BSDF_DIFFUSE_ID: {
float3 weight = sd->svm_closure_weight * mix_weight;
OrenNayarBsdf *bsdf = (OrenNayarBsdf*)bsdf_alloc(sd, sizeof(OrenNayarBsdf), weight);
if(bsdf) {
bsdf->N = N;
float roughness = param1;
if(roughness == 0.0f) {
sd->flag |= bsdf_diffuse_setup((DiffuseBsdf*)bsdf);
}
else {
bsdf->roughness = roughness;
sd->flag |= bsdf_oren_nayar_setup(bsdf);
}
}
break;
}
case CLOSURE_BSDF_TRANSLUCENT_ID: {
float3 weight = sd->svm_closure_weight * mix_weight;
DiffuseBsdf *bsdf = (DiffuseBsdf*)bsdf_alloc(sd, sizeof(DiffuseBsdf), weight);
if(bsdf) {
bsdf->N = N;
sd->flag |= bsdf_translucent_setup(bsdf);
}
break;
}
case CLOSURE_BSDF_TRANSPARENT_ID: {
float3 weight = sd->svm_closure_weight * mix_weight;
bsdf_transparent_setup(sd, weight, path_flag);
break;
}
case CLOSURE_BSDF_REFLECTION_ID:
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
float3 weight = sd->svm_closure_weight * mix_weight;
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), weight);
if(!bsdf) {
break;
}
float roughness = sqr(param1);
bsdf->N = N;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
bsdf->alpha_x = roughness;
bsdf->alpha_y = roughness;
bsdf->ior = 0.0f;
bsdf->extra = NULL;
/* setup bsdf */
if(type == CLOSURE_BSDF_REFLECTION_ID)
sd->flag |= bsdf_reflection_setup(bsdf);
else if(type == CLOSURE_BSDF_MICROFACET_BECKMANN_ID)
sd->flag |= bsdf_microfacet_beckmann_setup(bsdf);
else if(type == CLOSURE_BSDF_MICROFACET_GGX_ID)
sd->flag |= bsdf_microfacet_ggx_setup(bsdf);
else if(type == CLOSURE_BSDF_MICROFACET_MULTI_GGX_ID) {
kernel_assert(stack_valid(data_node.z));
bsdf->extra = (MicrofacetExtra*)closure_alloc_extra(sd, sizeof(MicrofacetExtra));
if(bsdf->extra) {
bsdf->extra->color = stack_load_float3(stack, data_node.z);
bsdf->extra->cspec0 = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra->clearcoat = 0.0f;
sd->flag |= bsdf_microfacet_multi_ggx_setup(bsdf);
}
}
else {
sd->flag |= bsdf_ashikhmin_shirley_setup(bsdf);
}
break;
}
case CLOSURE_BSDF_REFRACTION_ID:
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
float3 weight = sd->svm_closure_weight * mix_weight;
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), weight);
if(bsdf) {
bsdf->N = N;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra = NULL;
float eta = fmaxf(param2, 1e-5f);
eta = (sd->flag & SD_BACKFACING)? 1.0f/eta: eta;
/* setup bsdf */
if(type == CLOSURE_BSDF_REFRACTION_ID) {
bsdf->alpha_x = 0.0f;
bsdf->alpha_y = 0.0f;
bsdf->ior = eta;
sd->flag |= bsdf_refraction_setup(bsdf);
}
else {
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_SHARP_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_GGX_GLASS_ID:
case CLOSURE_BSDF_MICROFACET_BECKMANN_GLASS_ID: {
#ifdef __CAUSTICS_TRICKS__
if(!kernel_data.integrator.caustics_reflective &&
!kernel_data.integrator.caustics_refractive && (path_flag & PATH_RAY_DIFFUSE))
{
break;
}
#endif
float3 weight = sd->svm_closure_weight * mix_weight;
/* index of refraction */
float eta = fmaxf(param2, 1e-5f);
eta = (sd->flag & SD_BACKFACING)? 1.0f/eta: eta;
/* fresnel */
float cosNO = dot(N, sd->I);
float fresnel = fresnel_dielectric_cos(cosNO, eta);
float roughness = sqr(param1);
/* reflection */
#ifdef __CAUSTICS_TRICKS__
if(kernel_data.integrator.caustics_reflective || (path_flag & PATH_RAY_DIFFUSE) == 0)
#endif
{
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), weight*fresnel);
if(bsdf) {
bsdf->N = N;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra = NULL;
svm_node_glass_setup(sd, bsdf, type, eta, roughness, false);
}
}
/* refraction */
#ifdef __CAUSTICS_TRICKS__
if(kernel_data.integrator.caustics_refractive || (path_flag & PATH_RAY_DIFFUSE) == 0)
#endif
{
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), weight*(1.0f - fresnel));
if(bsdf) {
bsdf->N = N;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra = NULL;
svm_node_glass_setup(sd, bsdf, type, eta, roughness, true);
}
}
break;
}
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_GLASS_ID: {
#ifdef __CAUSTICS_TRICKS__
if(!kernel_data.integrator.caustics_reflective && !kernel_data.integrator.caustics_refractive && (path_flag & PATH_RAY_DIFFUSE))
break;
#endif
float3 weight = sd->svm_closure_weight * mix_weight;
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), weight);
if(!bsdf) {
break;
}
MicrofacetExtra *extra = (MicrofacetExtra*)closure_alloc_extra(sd, sizeof(MicrofacetExtra));
if(!extra) {
break;
}
bsdf->N = N;
bsdf->extra = extra;
bsdf->T = make_float3(0.0f, 0.0f, 0.0f);
float roughness = sqr(param1);
bsdf->alpha_x = roughness;
bsdf->alpha_y = roughness;
float eta = fmaxf(param2, 1e-5f);
bsdf->ior = (sd->flag & SD_BACKFACING)? 1.0f/eta: eta;
kernel_assert(stack_valid(data_node.z));
bsdf->extra->color = stack_load_float3(stack, data_node.z);
bsdf->extra->cspec0 = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra->clearcoat = 0.0f;
/* setup bsdf */
sd->flag |= bsdf_microfacet_multi_ggx_glass_setup(bsdf);
break;
}
case CLOSURE_BSDF_MICROFACET_BECKMANN_ANISO_ID:
case CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID:
case CLOSURE_BSDF_MICROFACET_MULTI_GGX_ANISO_ID:
case CLOSURE_BSDF_ASHIKHMIN_SHIRLEY_ANISO_ID: {
#ifdef __CAUSTICS_TRICKS__
if(!kernel_data.integrator.caustics_reflective && (path_flag & PATH_RAY_DIFFUSE))
break;
#endif
float3 weight = sd->svm_closure_weight * mix_weight;
MicrofacetBsdf *bsdf = (MicrofacetBsdf*)bsdf_alloc(sd, sizeof(MicrofacetBsdf), weight);
if(bsdf) {
bsdf->N = N;
bsdf->extra = NULL;
bsdf->T = stack_load_float3(stack, data_node.y);
/* rotate tangent */
float rotation = stack_load_float(stack, data_node.z);
if(rotation != 0.0f)
bsdf->T = rotate_around_axis(bsdf->T, bsdf->N, rotation * M_2PI_F);
/* compute roughness */
float roughness = sqr(param1);
float anisotropy = clamp(param2, -0.99f, 0.99f);
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);
}
bsdf->ior = 0.0f;
if(type == CLOSURE_BSDF_MICROFACET_BECKMANN_ANISO_ID) {
sd->flag |= bsdf_microfacet_beckmann_aniso_setup(bsdf);
}
else if(type == CLOSURE_BSDF_MICROFACET_GGX_ANISO_ID) {
sd->flag |= bsdf_microfacet_ggx_aniso_setup(bsdf);
}
else if(type == CLOSURE_BSDF_MICROFACET_MULTI_GGX_ANISO_ID) {
kernel_assert(stack_valid(data_node.w));
bsdf->extra = (MicrofacetExtra*)closure_alloc_extra(sd, sizeof(MicrofacetExtra));
if(bsdf->extra) {
bsdf->extra->color = stack_load_float3(stack, data_node.w);
bsdf->extra->cspec0 = make_float3(0.0f, 0.0f, 0.0f);
bsdf->extra->clearcoat = 0.0f;
sd->flag |= bsdf_microfacet_multi_ggx_aniso_setup(bsdf);
}
}
else
sd->flag |= bsdf_ashikhmin_shirley_aniso_setup(bsdf);
}
break;
}
case CLOSURE_BSDF_ASHIKHMIN_VELVET_ID: {
float3 weight = sd->svm_closure_weight * mix_weight;
VelvetBsdf *bsdf = (VelvetBsdf*)bsdf_alloc(sd, sizeof(VelvetBsdf), weight);
if(bsdf) {
bsdf->N = N;
bsdf->sigma = saturate(param1);
sd->flag |= bsdf_ashikhmin_velvet_setup(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: {
float3 weight = sd->svm_closure_weight * mix_weight;
ToonBsdf *bsdf = (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__
case CLOSURE_BSDF_HAIR_REFLECTION_ID:
case CLOSURE_BSDF_HAIR_TRANSMISSION_ID: {
float3 weight = sd->svm_closure_weight * mix_weight;
if(sd->flag & SD_BACKFACING && sd->type & PRIMITIVE_ALL_CURVE) {
/* todo: giving a fixed weight here will cause issues when
* mixing multiple BSDFS. energy will not be conserved and
* the throughput can blow up after multiple bounces. we
* better figure out a way to skip backfaces from rays
* spawned by transmission from the front */
bsdf_transparent_setup(sd, make_float3(1.0f, 1.0f, 1.0f), path_flag);
}
else {
HairBsdf *bsdf = (HairBsdf*)bsdf_alloc(sd, sizeof(HairBsdf), weight);
if(bsdf) {
bsdf->N = N;
bsdf->roughness1 = param1;
bsdf->roughness2 = param2;
bsdf->offset = -stack_load_float(stack, data_node.z);
if(stack_valid(data_node.y)) {
bsdf->T = normalize(stack_load_float3(stack, data_node.y));
}
else if(!(sd->type & PRIMITIVE_ALL_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
#ifdef __SUBSURFACE__
case CLOSURE_BSSRDF_CUBIC_ID:
case CLOSURE_BSSRDF_GAUSSIAN_ID:
case CLOSURE_BSSRDF_BURLEY_ID:
case CLOSURE_BSSRDF_RANDOM_WALK_ID: {
float3 weight = sd->svm_closure_weight * mix_weight;
Bssrdf *bssrdf = bssrdf_alloc(sd, weight);
if(bssrdf) {
/* disable in case of diffuse ancestor, can't see it well then and
* adds considerably noise due to probabilities of continuing path
* getting lower and lower */
if(path_flag & PATH_RAY_DIFFUSE_ANCESTOR)
param1 = 0.0f;
bssrdf->radius = stack_load_float3(stack, data_node.z)*param1;
bssrdf->albedo = sd->svm_closure_weight;
bssrdf->texture_blur = param2;
bssrdf->sharpness = stack_load_float(stack, data_node.w);
bssrdf->N = N;
bssrdf->roughness = 0.0f;
sd->flag |= bssrdf_setup(sd, bssrdf, (ClosureType)type);
}
break;
}
#endif
default:
break;
}
}
ccl_device void svm_node_closure_volume(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, ShaderType shader_type)
{
#ifdef __VOLUME__
/* Only sum extinction for volumes, variable is shared with surface transparency. */
if(shader_type != SHADER_TYPE_VOLUME) {
return;
}
uint type, density_offset, anisotropy_offset;
uint mix_weight_offset;
decode_node_uchar4(node.y, &type, &density_offset, &anisotropy_offset, &mix_weight_offset);
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);
/* Compute scattering coefficient. */
float3 weight = sd->svm_closure_weight;
if(type == CLOSURE_VOLUME_ABSORPTION_ID) {
weight = make_float3(1.0f, 1.0f, 1.0f) - weight;
}
weight *= density;
/* Add closure for volume scattering. */
if(type == CLOSURE_VOLUME_HENYEY_GREENSTEIN_ID) {
HenyeyGreensteinVolume *volume = (HenyeyGreensteinVolume*)bsdf_alloc(sd, sizeof(HenyeyGreensteinVolume), weight);
if(volume) {
float anisotropy = (stack_valid(anisotropy_offset))? stack_load_float(stack, anisotropy_offset): __uint_as_float(node.w);
volume->g = anisotropy; /* g */
sd->flag |= volume_henyey_greenstein_setup(volume);
}
}
/* Sum total extinction weight. */
volume_extinction_setup(sd, weight);
#endif
}
ccl_device void svm_node_principled_volume(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node, ShaderType shader_type, int path_flag, int *offset)
{
#ifdef __VOLUME__
uint4 value_node = read_node(kg, offset);
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;
}
uint density_offset, anisotropy_offset, absorption_color_offset, mix_weight_offset;
decode_node_uchar4(node.y, &density_offset, &anisotropy_offset, &absorption_color_offset, &mix_weight_offset);
float mix_weight = (stack_valid(mix_weight_offset)? stack_load_float(stack, mix_weight_offset): 1.0f);
if(mix_weight == 0.0f) {
return;
}
/* Compute density. */
float primitive_density = 1.0f;
float density = (stack_valid(density_offset))? stack_load_float(stack, density_offset): __uint_as_float(value_node.x);
density = mix_weight * fmaxf(density, 0.0f);
if(density > CLOSURE_WEIGHT_CUTOFF) {
/* 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_attribute_float(kg, sd, attr_density, NULL, NULL);
density = fmaxf(density * primitive_density, 0.0f);
}
}
if(density > CLOSURE_WEIGHT_CUTOFF) {
/* Compute scattering color. */
float3 color = sd->svm_closure_weight;
const AttributeDescriptor attr_color = find_attribute(kg, sd, attr_node.y);
if(attr_color.offset != ATTR_STD_NOT_FOUND) {
color *= primitive_attribute_float3(kg, sd, attr_color, NULL, NULL);
}
/* Add closure for volume scattering. */
HenyeyGreensteinVolume *volume = (HenyeyGreensteinVolume*)bsdf_alloc(sd, sizeof(HenyeyGreensteinVolume), color * density);
if(volume) {
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. */
float3 zero = make_float3(0.0f, 0.0f, 0.0f);
float3 one = make_float3(1.0f, 1.0f, 1.0f);
float3 absorption_color = max(sqrt(stack_load_float3(stack, absorption_color_offset)), zero);
float3 absorption = max(one - color, zero) * max(one - 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;
}
uint emission_offset, emission_color_offset, blackbody_offset, temperature_offset;
decode_node_uchar4(node.z, &emission_offset, &emission_color_offset, &blackbody_offset, &temperature_offset);
float emission = (stack_valid(emission_offset))? stack_load_float(stack, emission_offset): __uint_as_float(value_node.z);
float blackbody = (stack_valid(blackbody_offset))? stack_load_float(stack, blackbody_offset): __uint_as_float(value_node.w);
if(emission > CLOSURE_WEIGHT_CUTOFF) {
float3 emission_color = stack_load_float3(stack, emission_color_offset);
emission_setup(sd, emission * emission_color);
}
if(blackbody > CLOSURE_WEIGHT_CUTOFF) {
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) {
float temperature = primitive_attribute_float(kg, sd, attr_temperature, NULL, NULL);
T *= fmaxf(temperature, 0.0f);
}
T = fmaxf(T, 0.0f);
/* Stefan-Boltzmann law. */
float T4 = sqr(sqr(T));
float sigma = 5.670373e-8f * 1e-6f / M_PI_F;
float intensity = sigma * mix(1.0f, T4, blackbody);
if(intensity > CLOSURE_WEIGHT_CUTOFF) {
float3 blackbody_tint = stack_load_float3(stack, node.w);
float3 bb = blackbody_tint * intensity * svm_math_blackbody_color(T);
emission_setup(sd, bb);
}
}
#endif
}
ccl_device void svm_node_closure_emission(ShaderData *sd, float *stack, uint4 node)
{
uint mix_weight_offset = node.y;
float3 weight = sd->svm_closure_weight;
if(stack_valid(mix_weight_offset)) {
float mix_weight = stack_load_float(stack, mix_weight_offset);
if(mix_weight == 0.0f)
return;
weight *= mix_weight;
}
emission_setup(sd, weight);
}
ccl_device void svm_node_closure_background(ShaderData *sd, float *stack, uint4 node)
{
uint mix_weight_offset = node.y;
float3 weight = sd->svm_closure_weight;
if(stack_valid(mix_weight_offset)) {
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 void svm_node_closure_holdout(ShaderData *sd, float *stack, uint4 node)
{
uint mix_weight_offset = node.y;
if(stack_valid(mix_weight_offset)) {
float mix_weight = stack_load_float(stack, mix_weight_offset);
if(mix_weight == 0.0f)
return;
closure_alloc(sd, sizeof(ShaderClosure), CLOSURE_HOLDOUT_ID, sd->svm_closure_weight * mix_weight);
}
else
closure_alloc(sd, sizeof(ShaderClosure), CLOSURE_HOLDOUT_ID, sd->svm_closure_weight);
sd->flag |= SD_HOLDOUT;
}
/* Closure Nodes */
ccl_device_inline void svm_node_closure_store_weight(ShaderData *sd, float3 weight)
{
sd->svm_closure_weight = weight;
}
ccl_device void svm_node_closure_set_weight(ShaderData *sd, uint r, uint g, uint b)
{
float3 weight = make_float3(__uint_as_float(r), __uint_as_float(g), __uint_as_float(b));
svm_node_closure_store_weight(sd, weight);
}
ccl_device void svm_node_closure_weight(ShaderData *sd, float *stack, uint weight_offset)
{
float3 weight = stack_load_float3(stack, weight_offset);
svm_node_closure_store_weight(sd, weight);
}
ccl_device void svm_node_emission_weight(KernelGlobals *kg, ShaderData *sd, float *stack, uint4 node)
{
uint color_offset = node.y;
uint strength_offset = node.z;
float strength = stack_load_float(stack, strength_offset);
float3 weight = stack_load_float3(stack, color_offset)*strength;
svm_node_closure_store_weight(sd, weight);
}
ccl_device void svm_node_mix_closure(ShaderData *sd, float *stack, uint4 node)
{
/* fetch weight from blend input, previous mix closures,
* and write to stack to be used by closure nodes later */
uint weight_offset, in_weight_offset, weight1_offset, weight2_offset;
decode_node_uchar4(node.y, &weight_offset, &in_weight_offset, &weight1_offset, &weight2_offset);
float weight = stack_load_float(stack, weight_offset);
weight = saturate(weight);
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, ShaderData *sd, float *stack, uint in_direction, uint out_normal)
{
float3 normal = stack_load_float3(stack, in_direction);
sd->N = normal;
stack_store_float3(stack, out_normal, normal);
}
CCL_NAMESPACE_END