/* 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/emissive.h" #include "kernel/util/color.h" CCL_NAMESPACE_BEGIN /* Closure Nodes */ ccl_device_inline int svm_node_closure_bsdf_skip(KernelGlobals kg, int offset, 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 #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, uint4 node, uint32_t path_flag, int offset) { uint type, param1_offset, param2_offset; uint mix_weight_offset; svm_unpack_node_uchar4(node.y, &type, ¶m1_offset, ¶m2_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_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); 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) { case CLOSURE_BSDF_PRINCIPLED_ID: { uint specular_ior_level_offset, roughness_offset, specular_tint_offset, anisotropic_offset, sheen_weight_offset, sheen_tint_offset, sheen_roughness_offset, coat_weight_offset, coat_roughness_offset, coat_ior_offset, eta_offset, transmission_weight_offset, anisotropic_rotation_offset, coat_tint_offset, coat_normal_offset, alpha_offset, emission_strength_offset, emission_offset, thinfilm_thickness_offset, diffuse_roughness_offset; 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 float metallic = saturatef(param1); float subsurface_weight = saturatef(param2); float specular_ior_level = max(stack_load_float(stack, specular_ior_level_offset), 0.0f); float roughness = saturatef(stack_load_float(stack, roughness_offset)); Spectrum specular_tint = rgb_to_spectrum( max(stack_load_float3(stack, specular_tint_offset), zero_float3())); float anisotropic = saturatef(stack_load_float(stack, anisotropic_offset)); float sheen_weight = max(stack_load_float(stack, sheen_weight_offset), 0.0f); float3 sheen_tint = max(stack_load_float3(stack, sheen_tint_offset), zero_float3()); float sheen_roughness = saturatef(stack_load_float(stack, sheen_roughness_offset)); float coat_weight = fmaxf(stack_load_float(stack, coat_weight_offset), 0.0f); float coat_roughness = saturatef(stack_load_float(stack, coat_roughness_offset)); float coat_ior = fmaxf(stack_load_float(stack, coat_ior_offset), 1.0f); float3 coat_tint = max(stack_load_float3(stack, coat_tint_offset), zero_float3()); float transmission_weight = saturatef(stack_load_float(stack, transmission_weight_offset)); float anisotropic_rotation = stack_load_float(stack, anisotropic_rotation_offset); float ior = fmaxf(stack_load_float(stack, eta_offset), 1e-5f); ClosureType distribution = (ClosureType)data_node2.y; #ifdef __SUBSURFACE__ ClosureType subsurface_method = (ClosureType)data_node2.z; #endif 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 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 uint4 data_subsurf = read_node(kg, &offset); 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); float emission_strength = stack_valid(emission_strength_offset) ? stack_load_float(stack, emission_strength_offset) : __uint_as_float(data_alpha_emission_thin.z); float3 emission = stack_load_float3(stack, emission_offset) * emission_strength; float thinfilm_thickness = fmaxf(stack_load_float(stack, thinfilm_thickness_offset), 1e-5f); 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), alpha_y = sqr(roughness); if (anisotropic > 0.0f) { 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 */ 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 */ 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. */ 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. */ float cosNT = sqrtf(1.0f - sqr(1.0f / coat_ior) * (1 - sqr(cosNI))); 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 != NULL) ? (ccl_private FresnelF82Tint *)closure_alloc_extra(sd, sizeof(FresnelF82Tint)) : NULL; 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 != NULL) ? (ccl_private FresnelGeneralizedSchlick *)closure_alloc_extra( sd, sizeof(FresnelGeneralizedSchlick)) : NULL; 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 != NULL) ? (ccl_private FresnelGeneralizedSchlick *)closure_alloc_extra( sd, sizeof(FresnelGeneralizedSchlick)) : NULL; 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 */ 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) { float3 subsurface_radius = stack_load_float3(stack, data_subsurf.y); 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 subsurface_weight = 0.0f; (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: { Spectrum weight = closure_weight * mix_weight; ccl_private OrenNayarBsdf *bsdf = (ccl_private OrenNayarBsdf *)bsdf_alloc( sd, sizeof(OrenNayarBsdf), weight); if (bsdf) { bsdf->N = N; 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: { 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: { 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 != NULL) { uint base_ior_offset, edge_tint_k_offset, rotation_offset, tangent_offset; svm_unpack_node_uchar4( node.z, &base_ior_offset, &edge_tint_k_offset, &rotation_offset, &tangent_offset); 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), alpha_y = sqr(roughness); if (anisotropy > 0.0f) { float aspect = sqrtf(1.0f - anisotropy * 0.9f); alpha_x /= aspect; alpha_y *= aspect; 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; 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: { Spectrum weight = closure_weight * mix_weight; float3 position = stack_load_float3(stack, data_node.y); 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 Spectrum weight = closure_weight * mix_weight; ccl_private MicrofacetBsdf *bsdf = (ccl_private MicrofacetBsdf *)bsdf_alloc( sd, sizeof(MicrofacetBsdf), weight); if (!bsdf) { break; } float roughness = sqr(saturatef(param1)); bsdf->N = maybe_ensure_valid_specular_reflection(sd, N); bsdf->ior = 1.0f; /* compute roughness */ 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 */ 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 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 */ 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 != NULL) ? (ccl_private FresnelGeneralizedSchlick *)closure_alloc_extra( sd, sizeof(FresnelGeneralizedSchlick)) : NULL; if (bsdf && fresnel) { bsdf->N = maybe_ensure_valid_specular_reflection(sd, N); bsdf->T = zero_float3(); 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: { 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: { 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: { 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: { uint4 data_node2 = read_node(kg, &offset); uint4 data_node3 = read_node(kg, &offset); uint4 data_node4 = read_node(kg, &offset); Spectrum weight = closure_weight * mix_weight; uint offset_ofs, ior_ofs, color_ofs, parametrization; svm_unpack_node_uchar4(data_node.y, &offset_ofs, &ior_ofs, &color_ofs, ¶metrization); float alpha = stack_load_float_default(stack, offset_ofs, data_node.z); float ior = stack_load_float_default(stack, ior_ofs, data_node.w); uint tint_ofs, melanin_ofs, melanin_redness_ofs, absorption_coefficient_ofs; svm_unpack_node_uchar4(data_node2.x, &tint_ofs, &melanin_ofs, &melanin_redness_ofs, &absorption_coefficient_ofs); uint shared_ofs1, random_ofs, random_color_ofs, 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, NULL, NULL); } else { random = stack_load_float_default(stack, random_ofs, data_node3.y); } /* Random factors range: [-randomization/2, +randomization/2]. */ float random_roughness = param2; float factor_random_roughness = 1.0f + 2.0f * (random - 0.5f) * random_roughness; float roughness = param1 * factor_random_roughness; 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: { 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); 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); 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. */ float eumelanin = melanin * (1.0f - melanin_redness); float pheomelanin = melanin * melanin_redness; Spectrum melanin_sigma = bsdf_principled_hair_sigma_from_concentration(eumelanin, pheomelanin); /* Optional tint. */ float3 tint = stack_load_float3(stack, tint_ofs); 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: { 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. */ float coat = stack_load_float_default(stack, shared_ofs1, data_node3.w); 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, TT_ofs, TRT_ofs, unused; svm_unpack_node_uchar4(data_node4.x, &R_ofs, &TT_ofs, &TRT_ofs, &unused); float R = stack_load_float_default(stack, R_ofs, data_node4.y); float TT = stack_load_float_default(stack, TT_ofs, data_node4.z); 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, NULL, NULL); } 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: { 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: { 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; } template ccl_device_noinline void svm_node_closure_volume(KernelGlobals kg, ccl_private ShaderData *sd, ccl_private float *stack, Spectrum closure_weight, uint4 node) { #ifdef __VOLUME__ /* Only sum extinction for volumes, variable is shared with surface transparency. */ if (shader_type != SHADER_TYPE_VOLUME) { return; } uint type, density_offset, param1_offset, mix_weight_offset; svm_unpack_node_uchar4(node.y, &type, &density_offset, ¶m1_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) * 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)) { 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(node.w); 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, node.w); 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, node.w); sd->flag |= volume_draine_setup(volume); } } break; case CLOSURE_VOLUME_MIE_ID: { /* We approximate the Mie phase function for water droplets using a mix of Draine and H-G * following "An Approximate Mie Scattering Function for Fog and Cloud Rendering", Johannes * Jendersie and Eugene d'Eon, https://research.nvidia.com/labs/rtr/approximate-mie. * * The numerical fit here (eq. 4-7 in the paper) is intended for 5 1.67154, so we clamp it to 2 to be safe. */ const float d = max(2.0f, stack_valid(param1_offset) ? stack_load_float(stack, param1_offset) : __uint_as_float(node.w)); const float mixture = fast_expf(-0.599085f / (d - 0.641583f) - 0.665888f); ccl_private HenyeyGreensteinVolume *hg = (ccl_private HenyeyGreensteinVolume *)bsdf_alloc( sd, sizeof(HenyeyGreensteinVolume), weight * (1.0f - mixture)); if (hg) { hg->g = fast_expf(-0.0990567f / (d - 1.67154f)); 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 = fast_expf(-2.20679f / (d + 3.91029f) - 0.428934f); draine->alpha = fast_expf(3.62489f - 8.29288f / (d + 5.52825f)); sd->flag |= volume_draine_setup(draine); } } break; } } /* Sum total extinction weight. */ volume_extinction_setup(sd, weight); #endif } template ccl_device_noinline int svm_node_principled_volume(KernelGlobals kg, ccl_private ShaderData *sd, ccl_private float *stack, Spectrum closure_weight, uint4 node, uint32_t 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 offset; } uint density_offset, anisotropy_offset, absorption_color_offset, mix_weight_offset; svm_unpack_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 offset; } /* 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) * object_volume_density(kg, sd->object); 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_volume_attribute_float(kg, sd, attr_density); density = fmaxf(density * primitive_density, 0.0f); } } if (density > CLOSURE_WEIGHT_CUTOFF) { /* 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) { 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 absorption_color = max(sqrt(stack_load_float3(stack, absorption_color_offset)), zero_float3()); Spectrum zero = zero_spectrum(); Spectrum one = one_spectrum(); 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, emission_color_offset, blackbody_offset, temperature_offset; svm_unpack_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, rgb_to_spectrum(emission * emission_color * object_volume_density(kg, sd->object))); } 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_volume_attribute_float(kg, sd, attr_temperature); 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 * rec709_to_rgb(kg, svm_math_blackbody_color_rec709(T)); emission_setup(sd, rgb_to_spectrum(bb * object_volume_density(kg, sd->object))); } } #endif return offset; } ccl_device_noinline void svm_node_closure_emission(KernelGlobals kg, ccl_private ShaderData *sd, ccl_private float *stack, Spectrum closure_weight, uint4 node) { uint mix_weight_offset = node.y; Spectrum weight = 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; } 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, uint4 node) { uint mix_weight_offset = node.y; Spectrum weight = 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_noinline void svm_node_closure_holdout(ccl_private ShaderData *sd, ccl_private float *stack, Spectrum closure_weight, 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, 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, uint r, uint g, 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, 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, uint4 node) { uint color_offset = node.y; uint strength_offset = node.z; 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, 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; 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); 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, 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