943e73b07e
The motivation for this is twofold. It improves performance (5-10% on most benchmark scenes), and will help to bring back transparency support for the ambient occlusion pass. * Duplicate some members from the main path state in the shadow path state. * Add shadow paths incrementally to the array similar to what we do for the shadow catchers. * For the scheduling, allow running shade surface and shade volume kernels as long as there is enough space in the shadow paths array. If not, execute shadow kernels until it is empty. * Add IntegratorShadowState and ConstIntegratorShadowState typedefs that can be different between CPU and GPU. For GPU both main and shadow paths juse have an integer for SoA access. Bt with CPU it's a different pointer type so we get type safety checks in code shared between CPU and GPU. * For CPU, add a separate IntegratorShadowStateCPU struct embedded in IntegratorShadowState. * Update various functions to take the shadow state, and make SVM take either type of state using templates. Differential Revision: https://developer.blender.org/D12889
121 lines
3.7 KiB
C++
121 lines
3.7 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/integrator/integrator_state_util.h"
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#include "kernel/kernel_path_state.h"
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CCL_NAMESPACE_BEGIN
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/* Check whether current surface bounce is where path is to be split for the shadow catcher. */
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ccl_device_inline bool kernel_shadow_catcher_is_path_split_bounce(KernelGlobals kg,
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IntegratorState state,
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const int object_flag)
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{
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#ifdef __SHADOW_CATCHER__
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if (!kernel_data.integrator.has_shadow_catcher) {
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return false;
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}
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/* Check the flag first, avoiding fetches form global memory. */
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if ((object_flag & SD_OBJECT_SHADOW_CATCHER) == 0) {
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return false;
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}
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if (object_flag & SD_OBJECT_HOLDOUT_MASK) {
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return false;
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}
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const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
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if ((path_flag & PATH_RAY_TRANSPARENT_BACKGROUND) == 0) {
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/* Split only on primary rays, secondary bounces are to treat shadow catcher as a regular
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* object. */
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return false;
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}
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if (path_flag & PATH_RAY_SHADOW_CATCHER_PASS) {
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return false;
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}
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return true;
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#else
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(void)object_flag;
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return false;
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#endif
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}
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/* Check whether the current path can still split. */
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ccl_device_inline bool kernel_shadow_catcher_path_can_split(KernelGlobals kg,
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ConstIntegratorState state)
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{
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if (INTEGRATOR_PATH_IS_TERMINATED) {
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return false;
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}
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const uint32_t path_flag = INTEGRATOR_STATE(state, path, flag);
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if (path_flag & PATH_RAY_SHADOW_CATCHER_HIT) {
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/* Shadow catcher was already hit and the state was split. No further split is allowed. */
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return false;
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}
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return (path_flag & PATH_RAY_TRANSPARENT_BACKGROUND) != 0;
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}
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/* NOTE: Leaves kernel scheduling information untouched. Use INIT semantic for one of the paths
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* after this function. */
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ccl_device_inline bool kernel_shadow_catcher_split(KernelGlobals kg,
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IntegratorState state,
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const int object_flags)
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{
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#ifdef __SHADOW_CATCHER__
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if (!kernel_shadow_catcher_is_path_split_bounce(kg, state, object_flags)) {
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return false;
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}
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/* The split is to be done. Mark the current state as such, so that it stops contributing to the
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* shadow catcher matte pass, but keeps contributing to the combined pass. */
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INTEGRATOR_STATE_WRITE(state, path, flag) |= PATH_RAY_SHADOW_CATCHER_HIT;
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/* Split new state from the current one. This new state will only track contribution of shadow
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* catcher objects ignoring non-catcher objects. */
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integrator_state_shadow_catcher_split(kg, state);
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return true;
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#else
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(void)object_flags;
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return false;
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#endif
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}
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#ifdef __SHADOW_CATCHER__
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ccl_device_forceinline bool kernel_shadow_catcher_is_matte_path(const uint32_t path_flag)
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{
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return (path_flag & PATH_RAY_SHADOW_CATCHER_HIT) == 0;
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}
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ccl_device_forceinline bool kernel_shadow_catcher_is_object_pass(const uint32_t path_flag)
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{
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return path_flag & PATH_RAY_SHADOW_CATCHER_PASS;
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}
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#endif /* __SHADOW_CATCHER__ */
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CCL_NAMESPACE_END
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