503 lines
18 KiB
C++
503 lines
18 KiB
C++
/*
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* Copyright 2011-2021 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include "kernel/kernel_accumulate.h"
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#include "kernel/kernel_emission.h"
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#include "kernel/kernel_light.h"
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#include "kernel/kernel_passes.h"
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#include "kernel/kernel_path_state.h"
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#include "kernel/kernel_shader.h"
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#include "kernel/integrator/integrator_subsurface.h"
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#include "kernel/integrator/integrator_volume_stack.h"
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CCL_NAMESPACE_BEGIN
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ccl_device_forceinline void integrate_surface_shader_setup(INTEGRATOR_STATE_CONST_ARGS,
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ShaderData *sd)
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{
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Intersection isect ccl_optional_struct_init;
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integrator_state_read_isect(INTEGRATOR_STATE_PASS, &isect);
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Ray ray ccl_optional_struct_init;
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integrator_state_read_ray(INTEGRATOR_STATE_PASS, &ray);
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shader_setup_from_ray(kg, sd, &ray, &isect);
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}
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#ifdef __HOLDOUT__
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ccl_device_forceinline bool integrate_surface_holdout(INTEGRATOR_STATE_CONST_ARGS,
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ShaderData *sd,
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ccl_global float *ccl_restrict render_buffer)
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{
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/* Write holdout transparency to render buffer and stop if fully holdout. */
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const uint32_t path_flag = INTEGRATOR_STATE(path, flag);
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if (((sd->flag & SD_HOLDOUT) || (sd->object_flag & SD_OBJECT_HOLDOUT_MASK)) &&
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(path_flag & PATH_RAY_TRANSPARENT_BACKGROUND)) {
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const float3 holdout_weight = shader_holdout_apply(kg, sd);
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if (kernel_data.background.transparent) {
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const float3 throughput = INTEGRATOR_STATE(path, throughput);
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const float transparent = average(holdout_weight * throughput);
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kernel_accum_transparent(INTEGRATOR_STATE_PASS, transparent, render_buffer);
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}
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if (isequal_float3(holdout_weight, one_float3())) {
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return false;
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}
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}
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return true;
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}
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#endif /* __HOLDOUT__ */
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#ifdef __EMISSION__
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ccl_device_forceinline void integrate_surface_emission(INTEGRATOR_STATE_CONST_ARGS,
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const ShaderData *sd,
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ccl_global float *ccl_restrict
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render_buffer)
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{
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const uint32_t path_flag = INTEGRATOR_STATE(path, flag);
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/* Evaluate emissive closure. */
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float3 L = shader_emissive_eval(sd);
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# ifdef __HAIR__
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if (!(path_flag & PATH_RAY_MIS_SKIP) && (sd->flag & SD_USE_MIS) &&
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(sd->type & PRIMITIVE_ALL_TRIANGLE))
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# else
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if (!(path_flag & PATH_RAY_MIS_SKIP) && (sd->flag & SD_USE_MIS))
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# endif
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{
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const float bsdf_pdf = INTEGRATOR_STATE(path, mis_ray_pdf);
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const float t = sd->ray_length + INTEGRATOR_STATE(path, mis_ray_t);
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/* Multiple importance sampling, get triangle light pdf,
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* and compute weight with respect to BSDF pdf. */
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float pdf = triangle_light_pdf(kg, sd, t);
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float mis_weight = power_heuristic(bsdf_pdf, pdf);
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L *= mis_weight;
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}
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const float3 throughput = INTEGRATOR_STATE(path, throughput);
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kernel_accum_emission(INTEGRATOR_STATE_PASS, throughput, L, render_buffer);
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}
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#endif /* __EMISSION__ */
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#ifdef __EMISSION__
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/* Path tracing: sample point on light and evaluate light shader, then
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* queue shadow ray to be traced. */
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ccl_device_forceinline void integrate_surface_direct_light(INTEGRATOR_STATE_ARGS,
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ShaderData *sd,
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const RNGState *rng_state)
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{
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/* Test if there is a light or BSDF that needs direct light. */
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if (!(kernel_data.integrator.use_direct_light && (sd->flag & SD_BSDF_HAS_EVAL))) {
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return;
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}
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/* Sample position on a light. */
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LightSample ls ccl_optional_struct_init;
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{
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const int path_flag = INTEGRATOR_STATE(path, flag);
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const uint bounce = INTEGRATOR_STATE(path, bounce);
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float light_u, light_v;
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path_state_rng_2D(kg, rng_state, PRNG_LIGHT_U, &light_u, &light_v);
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if (!light_distribution_sample_from_position(
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kg, light_u, light_v, sd->time, sd->P, bounce, path_flag, &ls)) {
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return;
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}
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}
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kernel_assert(ls.pdf != 0.0f);
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/* Evaluate light shader.
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*
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* TODO: can we reuse sd memory? In theory we can move this after
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* integrate_surface_bounce, evaluate the BSDF, and only then evaluate
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* the light shader. This could also move to its own kernel, for
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* non-constant light sources. */
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ShaderDataTinyStorage emission_sd_storage;
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ShaderData *emission_sd = AS_SHADER_DATA(&emission_sd_storage);
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const float3 light_eval = light_sample_shader_eval(
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INTEGRATOR_STATE_PASS, emission_sd, &ls, sd->time);
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if (is_zero(light_eval)) {
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return;
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}
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/* Evaluate BSDF. */
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const bool is_transmission = shader_bsdf_is_transmission(sd, ls.D);
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BsdfEval bsdf_eval ccl_optional_struct_init;
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const float bsdf_pdf = shader_bsdf_eval(kg, sd, ls.D, is_transmission, &bsdf_eval, ls.shader);
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bsdf_eval_mul3(&bsdf_eval, light_eval / ls.pdf);
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if (ls.shader & SHADER_USE_MIS) {
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const float mis_weight = power_heuristic(ls.pdf, bsdf_pdf);
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bsdf_eval_mul(&bsdf_eval, mis_weight);
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}
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/* Path termination. */
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const float terminate = path_state_rng_light_termination(kg, rng_state);
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if (light_sample_terminate(kg, &ls, &bsdf_eval, terminate)) {
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return;
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}
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/* Create shadow ray. */
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Ray ray ccl_optional_struct_init;
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light_sample_to_surface_shadow_ray(kg, sd, &ls, &ray);
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const bool is_light = light_sample_is_light(&ls);
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/* Copy volume stack and enter/exit volume. */
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integrator_state_copy_volume_stack_to_shadow(INTEGRATOR_STATE_PASS);
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if (is_transmission) {
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# ifdef __VOLUME__
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shadow_volume_stack_enter_exit(INTEGRATOR_STATE_PASS, sd);
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# endif
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}
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/* Write shadow ray and associated state to global memory. */
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integrator_state_write_shadow_ray(INTEGRATOR_STATE_PASS, &ray);
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/* Copy state from main path to shadow path. */
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const uint16_t bounce = INTEGRATOR_STATE(path, bounce);
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const uint16_t transparent_bounce = INTEGRATOR_STATE(path, transparent_bounce);
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uint32_t shadow_flag = INTEGRATOR_STATE(path, flag);
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shadow_flag |= (is_light) ? PATH_RAY_SHADOW_FOR_LIGHT : 0;
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shadow_flag |= (is_transmission) ? PATH_RAY_TRANSMISSION_PASS : PATH_RAY_REFLECT_PASS;
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const float3 throughput = INTEGRATOR_STATE(path, throughput) * bsdf_eval_sum(&bsdf_eval);
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if (kernel_data.kernel_features & KERNEL_FEATURE_LIGHT_PASSES) {
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const float3 diffuse_glossy_ratio = (bounce == 0) ?
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bsdf_eval_diffuse_glossy_ratio(&bsdf_eval) :
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INTEGRATOR_STATE(path, diffuse_glossy_ratio);
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INTEGRATOR_STATE_WRITE(shadow_path, diffuse_glossy_ratio) = diffuse_glossy_ratio;
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}
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INTEGRATOR_STATE_WRITE(shadow_path, flag) = shadow_flag;
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INTEGRATOR_STATE_WRITE(shadow_path, bounce) = bounce;
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INTEGRATOR_STATE_WRITE(shadow_path, transparent_bounce) = transparent_bounce;
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INTEGRATOR_STATE_WRITE(shadow_path, throughput) = throughput;
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if (kernel_data.kernel_features & KERNEL_FEATURE_SHADOW_PASS) {
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INTEGRATOR_STATE_WRITE(shadow_path, unshadowed_throughput) = throughput;
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}
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/* Branch off shadow kernel. */
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INTEGRATOR_SHADOW_PATH_INIT(DEVICE_KERNEL_INTEGRATOR_INTERSECT_SHADOW);
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}
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#endif
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/* Path tracing: bounce off or through surface with new direction. */
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ccl_device_forceinline int integrate_surface_bsdf_bssrdf_bounce(INTEGRATOR_STATE_ARGS,
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ShaderData *sd,
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const RNGState *rng_state)
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{
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/* Sample BSDF or BSSRDF. */
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if (!(sd->flag & (SD_BSDF | SD_BSSRDF))) {
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return LABEL_NONE;
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}
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float bsdf_u, bsdf_v;
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path_state_rng_2D(kg, rng_state, PRNG_BSDF_U, &bsdf_u, &bsdf_v);
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const ShaderClosure *sc = shader_bsdf_bssrdf_pick(sd, &bsdf_u);
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#ifdef __SUBSURFACE__
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/* BSSRDF closure, we schedule subsurface intersection kernel. */
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if (CLOSURE_IS_BSSRDF(sc->type)) {
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return subsurface_bounce(INTEGRATOR_STATE_PASS, sd, sc);
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}
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#endif
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/* BSDF closure, sample direction. */
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float bsdf_pdf;
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BsdfEval bsdf_eval ccl_optional_struct_init;
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float3 bsdf_omega_in ccl_optional_struct_init;
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differential3 bsdf_domega_in ccl_optional_struct_init;
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int label;
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label = shader_bsdf_sample_closure(
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kg, sd, sc, bsdf_u, bsdf_v, &bsdf_eval, &bsdf_omega_in, &bsdf_domega_in, &bsdf_pdf);
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if (bsdf_pdf == 0.0f || bsdf_eval_is_zero(&bsdf_eval)) {
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return LABEL_NONE;
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}
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/* Setup ray. Note that clipping works through transparent bounces. */
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INTEGRATOR_STATE_WRITE(ray, P) = ray_offset(sd->P, (label & LABEL_TRANSMIT) ? -sd->Ng : sd->Ng);
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INTEGRATOR_STATE_WRITE(ray, D) = normalize(bsdf_omega_in);
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INTEGRATOR_STATE_WRITE(ray, t) = (label & LABEL_TRANSPARENT) ?
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INTEGRATOR_STATE(ray, t) - sd->ray_length :
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FLT_MAX;
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#ifdef __RAY_DIFFERENTIALS__
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INTEGRATOR_STATE_WRITE(ray, dP) = differential_make_compact(sd->dP);
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INTEGRATOR_STATE_WRITE(ray, dD) = differential_make_compact(bsdf_domega_in);
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#endif
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/* Update throughput. */
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float3 throughput = INTEGRATOR_STATE(path, throughput);
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throughput *= bsdf_eval_sum(&bsdf_eval) / bsdf_pdf;
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INTEGRATOR_STATE_WRITE(path, throughput) = throughput;
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if (kernel_data.kernel_features & KERNEL_FEATURE_LIGHT_PASSES) {
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if (INTEGRATOR_STATE(path, bounce) == 0) {
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INTEGRATOR_STATE_WRITE(path,
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diffuse_glossy_ratio) = bsdf_eval_diffuse_glossy_ratio(&bsdf_eval);
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}
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}
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/* Update path state */
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if (label & LABEL_TRANSPARENT) {
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INTEGRATOR_STATE_WRITE(path, mis_ray_t) += sd->ray_length;
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}
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else {
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INTEGRATOR_STATE_WRITE(path, mis_ray_pdf) = bsdf_pdf;
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INTEGRATOR_STATE_WRITE(path, mis_ray_t) = 0.0f;
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INTEGRATOR_STATE_WRITE(path, min_ray_pdf) = fminf(bsdf_pdf,
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INTEGRATOR_STATE(path, min_ray_pdf));
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}
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path_state_next(INTEGRATOR_STATE_PASS, label);
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return label;
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}
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#ifdef __VOLUME__
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ccl_device_forceinline bool integrate_surface_volume_only_bounce(INTEGRATOR_STATE_ARGS,
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ShaderData *sd)
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{
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if (!path_state_volume_next(INTEGRATOR_STATE_PASS)) {
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return LABEL_NONE;
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}
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/* Setup ray position, direction stays unchanged. */
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INTEGRATOR_STATE_WRITE(ray, P) = ray_offset(sd->P, -sd->Ng);
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/* Clipping works through transparent. */
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INTEGRATOR_STATE_WRITE(ray, t) -= sd->ray_length;
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# ifdef __RAY_DIFFERENTIALS__
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INTEGRATOR_STATE_WRITE(ray, dP) = differential_make_compact(sd->dP);
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# endif
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INTEGRATOR_STATE_WRITE(path, mis_ray_t) += sd->ray_length;
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return LABEL_TRANSMIT | LABEL_TRANSPARENT;
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}
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#endif
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#if defined(__AO__) && defined(__SHADER_RAYTRACE__)
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ccl_device_forceinline void integrate_surface_ao_pass(INTEGRATOR_STATE_CONST_ARGS,
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const ShaderData *ccl_restrict sd,
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const RNGState *ccl_restrict rng_state,
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ccl_global float *ccl_restrict render_buffer)
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{
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# ifdef __KERNEL_OPTIX__
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optixDirectCall<void>(2, INTEGRATOR_STATE_PASS, sd, rng_state, render_buffer);
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}
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extern "C" __device__ void __direct_callable__ao_pass(INTEGRATOR_STATE_CONST_ARGS,
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const ShaderData *ccl_restrict sd,
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const RNGState *ccl_restrict rng_state,
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ccl_global float *ccl_restrict render_buffer)
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{
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# endif /* __KERNEL_OPTIX__ */
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float bsdf_u, bsdf_v;
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path_state_rng_2D(kg, rng_state, PRNG_BSDF_U, &bsdf_u, &bsdf_v);
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const float3 ao_N = shader_bsdf_ao_normal(kg, sd);
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float3 ao_D;
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float ao_pdf;
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sample_cos_hemisphere(ao_N, bsdf_u, bsdf_v, &ao_D, &ao_pdf);
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if (dot(sd->Ng, ao_D) > 0.0f && ao_pdf != 0.0f) {
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Ray ray ccl_optional_struct_init;
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ray.P = ray_offset(sd->P, sd->Ng);
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ray.D = ao_D;
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ray.t = kernel_data.integrator.ao_bounces_distance;
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ray.time = sd->time;
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ray.dP = differential_zero_compact();
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ray.dD = differential_zero_compact();
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Intersection isect ccl_optional_struct_init;
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if (!scene_intersect(kg, &ray, PATH_RAY_SHADOW_OPAQUE, &isect)) {
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ccl_global float *buffer = kernel_pass_pixel_render_buffer(INTEGRATOR_STATE_PASS,
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render_buffer);
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const float3 throughput = INTEGRATOR_STATE(path, throughput);
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kernel_write_pass_float3(buffer + kernel_data.film.pass_ao, throughput);
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}
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}
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}
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#endif /* defined(__AO__) && defined(__SHADER_RAYTRACE__) */
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template<uint node_feature_mask>
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ccl_device bool integrate_surface(INTEGRATOR_STATE_ARGS,
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ccl_global float *ccl_restrict render_buffer)
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{
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PROFILING_INIT_FOR_SHADER(kg, PROFILING_SHADE_SURFACE_SETUP);
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/* Setup shader data. */
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ShaderData sd;
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integrate_surface_shader_setup(INTEGRATOR_STATE_PASS, &sd);
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PROFILING_SHADER(sd.object, sd.shader);
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int continue_path_label = 0;
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/* Skip most work for volume bounding surface. */
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#ifdef __VOLUME__
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if (!(sd.flag & SD_HAS_ONLY_VOLUME)) {
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#endif
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const int path_flag = INTEGRATOR_STATE(path, flag);
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#ifdef __SUBSURFACE__
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/* Can skip shader evaluation for BSSRDF exit point without bump mapping. */
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if (!(path_flag & PATH_RAY_SUBSURFACE) || ((sd.flag & SD_HAS_BSSRDF_BUMP)))
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#endif
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{
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/* Evaluate shader. */
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PROFILING_EVENT(PROFILING_SHADE_SURFACE_EVAL);
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shader_eval_surface<node_feature_mask>(INTEGRATOR_STATE_PASS, &sd, render_buffer, path_flag);
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}
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#ifdef __SUBSURFACE__
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if (INTEGRATOR_STATE(path, flag) & PATH_RAY_SUBSURFACE) {
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/* When coming from inside subsurface scattering, setup a diffuse
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* closure to perform lighting at the exit point. */
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INTEGRATOR_STATE_WRITE(path, flag) &= ~PATH_RAY_SUBSURFACE;
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subsurface_shader_data_setup(INTEGRATOR_STATE_PASS, &sd);
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}
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#endif
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shader_prepare_surface_closures(INTEGRATOR_STATE_PASS, &sd);
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#ifdef __HOLDOUT__
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/* Evaluate holdout. */
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if (!integrate_surface_holdout(INTEGRATOR_STATE_PASS, &sd, render_buffer)) {
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return false;
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}
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#endif
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#ifdef __EMISSION__
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/* Write emission. */
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if (sd.flag & SD_EMISSION) {
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integrate_surface_emission(INTEGRATOR_STATE_PASS, &sd, render_buffer);
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}
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#endif
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#ifdef __PASSES__
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/* Write render passes. */
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PROFILING_EVENT(PROFILING_SHADE_SURFACE_PASSES);
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kernel_write_data_passes(INTEGRATOR_STATE_PASS, &sd, render_buffer);
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#endif
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/* Load random number state. */
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RNGState rng_state;
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path_state_rng_load(INTEGRATOR_STATE_PASS, &rng_state);
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/* Perform path termination. Most paths have already been terminated in
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* the intersect_closest kernel, this is just for emission and for dividing
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* throughput by the probability at the right moment.
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*
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* Also ensure we don't do it twice for SSS at both the entry and exit point. */
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if (!(path_flag & PATH_RAY_SUBSURFACE)) {
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const float probability = (path_flag & PATH_RAY_TERMINATE_ON_NEXT_SURFACE) ?
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0.0f :
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path_state_continuation_probability(INTEGRATOR_STATE_PASS,
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path_flag);
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if (probability == 0.0f) {
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return false;
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}
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else if (probability != 1.0f) {
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INTEGRATOR_STATE_WRITE(path, throughput) /= probability;
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}
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}
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#ifdef __DENOISING_FEATURES__
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kernel_write_denoising_features_surface(INTEGRATOR_STATE_PASS, &sd, render_buffer);
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#endif
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#ifdef __SHADOW_CATCHER__
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kernel_write_shadow_catcher_bounce_data(INTEGRATOR_STATE_PASS, &sd, render_buffer);
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#endif
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/* Direct light. */
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PROFILING_EVENT(PROFILING_SHADE_SURFACE_DIRECT_LIGHT);
|
|
integrate_surface_direct_light(INTEGRATOR_STATE_PASS, &sd, &rng_state);
|
|
|
|
#if defined(__AO__) && defined(__SHADER_RAYTRACE__)
|
|
/* Ambient occlusion pass. */
|
|
if (node_feature_mask & KERNEL_FEATURE_NODE_RAYTRACE) {
|
|
if ((kernel_data.film.pass_ao != PASS_UNUSED) &&
|
|
(INTEGRATOR_STATE(path, flag) & PATH_RAY_CAMERA)) {
|
|
PROFILING_EVENT(PROFILING_SHADE_SURFACE_AO);
|
|
integrate_surface_ao_pass(INTEGRATOR_STATE_PASS, &sd, &rng_state, render_buffer);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
PROFILING_EVENT(PROFILING_SHADE_SURFACE_INDIRECT_LIGHT);
|
|
continue_path_label = integrate_surface_bsdf_bssrdf_bounce(
|
|
INTEGRATOR_STATE_PASS, &sd, &rng_state);
|
|
#ifdef __VOLUME__
|
|
}
|
|
else {
|
|
PROFILING_EVENT(PROFILING_SHADE_SURFACE_INDIRECT_LIGHT);
|
|
continue_path_label = integrate_surface_volume_only_bounce(INTEGRATOR_STATE_PASS, &sd);
|
|
}
|
|
|
|
if (continue_path_label & LABEL_TRANSMIT) {
|
|
/* Enter/Exit volume. */
|
|
volume_stack_enter_exit(INTEGRATOR_STATE_PASS, &sd);
|
|
}
|
|
#endif
|
|
|
|
return continue_path_label != 0;
|
|
}
|
|
|
|
template<uint node_feature_mask = KERNEL_FEATURE_NODE_MASK_SURFACE & ~KERNEL_FEATURE_NODE_RAYTRACE,
|
|
int current_kernel = DEVICE_KERNEL_INTEGRATOR_SHADE_SURFACE>
|
|
ccl_device_forceinline void integrator_shade_surface(INTEGRATOR_STATE_ARGS,
|
|
ccl_global float *ccl_restrict render_buffer)
|
|
{
|
|
if (integrate_surface<node_feature_mask>(INTEGRATOR_STATE_PASS, render_buffer)) {
|
|
if (INTEGRATOR_STATE(path, flag) & PATH_RAY_SUBSURFACE) {
|
|
INTEGRATOR_PATH_NEXT(current_kernel, DEVICE_KERNEL_INTEGRATOR_INTERSECT_SUBSURFACE);
|
|
}
|
|
else {
|
|
kernel_assert(INTEGRATOR_STATE(ray, t) != 0.0f);
|
|
INTEGRATOR_PATH_NEXT(current_kernel, DEVICE_KERNEL_INTEGRATOR_INTERSECT_CLOSEST);
|
|
}
|
|
}
|
|
else {
|
|
INTEGRATOR_PATH_TERMINATE(current_kernel);
|
|
}
|
|
}
|
|
|
|
ccl_device_forceinline void integrator_shade_surface_raytrace(
|
|
INTEGRATOR_STATE_ARGS, ccl_global float *ccl_restrict render_buffer)
|
|
{
|
|
integrator_shade_surface<KERNEL_FEATURE_NODE_MASK_SURFACE,
|
|
DEVICE_KERNEL_INTEGRATOR_SHADE_SURFACE_RAYTRACE>(INTEGRATOR_STATE_PASS,
|
|
render_buffer);
|
|
}
|
|
|
|
CCL_NAMESPACE_END
|