diff options
Diffstat (limited to 'intern/cycles/kernel/integrator/shade_background.h')
| -rw-r--r-- | intern/cycles/kernel/integrator/shade_background.h | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/intern/cycles/kernel/integrator/shade_background.h b/intern/cycles/kernel/integrator/shade_background.h new file mode 100644 index 00000000000..71a590749bd --- /dev/null +++ b/intern/cycles/kernel/integrator/shade_background.h @@ -0,0 +1,219 @@ +/* + * Copyright 2011-2021 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. + */ + +#pragma once + +#include "kernel/film/accumulate.h" +#include "kernel/integrator/shader_eval.h" +#include "kernel/light/light.h" +#include "kernel/light/sample.h" +#include "kernel/sample/mis.h" + +CCL_NAMESPACE_BEGIN + +ccl_device float3 integrator_eval_background_shader(KernelGlobals kg, + IntegratorState state, + ccl_global float *ccl_restrict render_buffer) +{ +#ifdef __BACKGROUND__ + const int shader = kernel_data.background.surface_shader; + const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag); + + /* Use visibility flag to skip lights. */ + if (shader & SHADER_EXCLUDE_ANY) { + if (((shader & SHADER_EXCLUDE_DIFFUSE) && (path_flag & PATH_RAY_DIFFUSE)) || + ((shader & SHADER_EXCLUDE_GLOSSY) && ((path_flag & (PATH_RAY_GLOSSY | PATH_RAY_REFLECT)) == + (PATH_RAY_GLOSSY | PATH_RAY_REFLECT))) || + ((shader & SHADER_EXCLUDE_TRANSMIT) && (path_flag & PATH_RAY_TRANSMIT)) || + ((shader & SHADER_EXCLUDE_CAMERA) && (path_flag & PATH_RAY_CAMERA)) || + ((shader & SHADER_EXCLUDE_SCATTER) && (path_flag & PATH_RAY_VOLUME_SCATTER))) + return zero_float3(); + } + + /* Use fast constant background color if available. */ + float3 L = zero_float3(); + if (!shader_constant_emission_eval(kg, shader, &L)) { + /* Evaluate background shader. */ + + /* TODO: does aliasing like this break automatic SoA in CUDA? + * Should we instead store closures separate from ShaderData? */ + ShaderDataTinyStorage emission_sd_storage; + ccl_private ShaderData *emission_sd = AS_SHADER_DATA(&emission_sd_storage); + + PROFILING_INIT_FOR_SHADER(kg, PROFILING_SHADE_LIGHT_SETUP); + shader_setup_from_background(kg, + emission_sd, + INTEGRATOR_STATE(state, ray, P), + INTEGRATOR_STATE(state, ray, D), + INTEGRATOR_STATE(state, ray, time)); + + PROFILING_SHADER(emission_sd->object, emission_sd->shader); + PROFILING_EVENT(PROFILING_SHADE_LIGHT_EVAL); + shader_eval_surface<KERNEL_FEATURE_NODE_MASK_SURFACE_LIGHT>( + kg, state, emission_sd, render_buffer, path_flag | PATH_RAY_EMISSION); + + L = shader_background_eval(emission_sd); + } + + /* Background MIS weights. */ +# ifdef __BACKGROUND_MIS__ + /* Check if background light exists or if we should skip pdf. */ + if (!(INTEGRATOR_STATE(state, path, flag) & PATH_RAY_MIS_SKIP) && + kernel_data.background.use_mis) { + const float3 ray_P = INTEGRATOR_STATE(state, ray, P); + const float3 ray_D = INTEGRATOR_STATE(state, ray, D); + const float mis_ray_pdf = INTEGRATOR_STATE(state, path, mis_ray_pdf); + const float mis_ray_t = INTEGRATOR_STATE(state, path, mis_ray_t); + + /* multiple importance sampling, get background light pdf for ray + * direction, and compute weight with respect to BSDF pdf */ + const float pdf = background_light_pdf(kg, ray_P - ray_D * mis_ray_t, ray_D); + const float mis_weight = power_heuristic(mis_ray_pdf, pdf); + + L *= mis_weight; + } +# endif + + return L; +#else + return make_float3(0.8f, 0.8f, 0.8f); +#endif +} + +ccl_device_inline void integrate_background(KernelGlobals kg, + IntegratorState state, + ccl_global float *ccl_restrict render_buffer) +{ + /* Accumulate transparency for transparent background. We can skip background + * shader evaluation unless a background pass is used. */ + bool eval_background = true; + float transparent = 0.0f; + + const bool is_transparent_background_ray = kernel_data.background.transparent && + (INTEGRATOR_STATE(state, path, flag) & + PATH_RAY_TRANSPARENT_BACKGROUND); + + if (is_transparent_background_ray) { + transparent = average(INTEGRATOR_STATE(state, path, throughput)); + +#ifdef __PASSES__ + eval_background = (kernel_data.film.light_pass_flag & PASSMASK(BACKGROUND)); +#else + eval_background = false; +#endif + } + + /* Evaluate background shader. */ + float3 L = (eval_background) ? integrator_eval_background_shader(kg, state, render_buffer) : + zero_float3(); + + /* When using the ao bounces approximation, adjust background + * shader intensity with ao factor. */ + if (path_state_ao_bounce(kg, state)) { + L *= kernel_data.integrator.ao_bounces_factor; + } + + /* Write to render buffer. */ + kernel_accum_background(kg, state, L, transparent, is_transparent_background_ray, render_buffer); +} + +ccl_device_inline void integrate_distant_lights(KernelGlobals kg, + IntegratorState state, + ccl_global float *ccl_restrict render_buffer) +{ + const float3 ray_D = INTEGRATOR_STATE(state, ray, D); + const float ray_time = INTEGRATOR_STATE(state, ray, time); + LightSample ls ccl_optional_struct_init; + for (int lamp = 0; lamp < kernel_data.integrator.num_all_lights; lamp++) { + if (light_sample_from_distant_ray(kg, ray_D, lamp, &ls)) { + /* Use visibility flag to skip lights. */ +#ifdef __PASSES__ + const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag); + + if (ls.shader & SHADER_EXCLUDE_ANY) { + if (((ls.shader & SHADER_EXCLUDE_DIFFUSE) && (path_flag & PATH_RAY_DIFFUSE)) || + ((ls.shader & SHADER_EXCLUDE_GLOSSY) && + ((path_flag & (PATH_RAY_GLOSSY | PATH_RAY_REFLECT)) == + (PATH_RAY_GLOSSY | PATH_RAY_REFLECT))) || + ((ls.shader & SHADER_EXCLUDE_TRANSMIT) && (path_flag & PATH_RAY_TRANSMIT)) || + ((ls.shader & SHADER_EXCLUDE_CAMERA) && (path_flag & PATH_RAY_CAMERA)) || + ((ls.shader & SHADER_EXCLUDE_SCATTER) && (path_flag & PATH_RAY_VOLUME_SCATTER))) + return; + } +#endif + + /* Evaluate light shader. */ + /* TODO: does aliasing like this break automatic SoA in CUDA? */ + ShaderDataTinyStorage emission_sd_storage; + ccl_private ShaderData *emission_sd = AS_SHADER_DATA(&emission_sd_storage); + float3 light_eval = light_sample_shader_eval(kg, state, emission_sd, &ls, ray_time); + if (is_zero(light_eval)) { + return; + } + + /* MIS weighting. */ + if (!(path_flag & PATH_RAY_MIS_SKIP)) { + /* multiple importance sampling, get regular light pdf, + * and compute weight with respect to BSDF pdf */ + const float mis_ray_pdf = INTEGRATOR_STATE(state, path, mis_ray_pdf); + const float mis_weight = power_heuristic(mis_ray_pdf, ls.pdf); + light_eval *= mis_weight; + } + + /* Write to render buffer. */ + const float3 throughput = INTEGRATOR_STATE(state, path, throughput); + kernel_accum_emission(kg, state, throughput, light_eval, render_buffer); + } + } +} + +ccl_device void integrator_shade_background(KernelGlobals kg, + IntegratorState state, + ccl_global float *ccl_restrict render_buffer) +{ + PROFILING_INIT(kg, PROFILING_SHADE_LIGHT_SETUP); + + /* TODO: unify these in a single loop to only have a single shader evaluation call. */ + integrate_distant_lights(kg, state, render_buffer); + integrate_background(kg, state, render_buffer); + +#ifdef __SHADOW_CATCHER__ + if (INTEGRATOR_STATE(state, path, flag) & PATH_RAY_SHADOW_CATCHER_BACKGROUND) { + INTEGRATOR_STATE_WRITE(state, path, flag) &= ~PATH_RAY_SHADOW_CATCHER_BACKGROUND; + + const int isect_prim = INTEGRATOR_STATE(state, isect, prim); + const int isect_type = INTEGRATOR_STATE(state, isect, type); + const int shader = intersection_get_shader_from_isect_prim(kg, isect_prim, isect_type); + const int shader_flags = kernel_tex_fetch(__shaders, shader).flags; + + if (shader_flags & SD_HAS_RAYTRACE) { + INTEGRATOR_PATH_NEXT_SORTED(DEVICE_KERNEL_INTEGRATOR_SHADE_BACKGROUND, + DEVICE_KERNEL_INTEGRATOR_SHADE_SURFACE_RAYTRACE, + shader); + } + else { + INTEGRATOR_PATH_NEXT_SORTED(DEVICE_KERNEL_INTEGRATOR_SHADE_BACKGROUND, + DEVICE_KERNEL_INTEGRATOR_SHADE_SURFACE, + shader); + } + return; + } +#endif + + INTEGRATOR_PATH_TERMINATE(DEVICE_KERNEL_INTEGRATOR_SHADE_BACKGROUND); +} + +CCL_NAMESPACE_END |