ba3f26fac5
With light linking, lights can be set to affect only specific objects in the scene. Shadow linking additionally gives control over which objects acts a shadow blockers for a light. Usage: https://wiki.blender.org/wiki/Reference/Release_Notes/4.0/Cycles Implementation: https://wiki.blender.org/wiki/Source/Render/Cycles/LightLinking Ref #104972 Co-authored-by: Brecht Van Lommel <brecht@blender.org>
72 lines
2.6 KiB
C++
72 lines
2.6 KiB
C++
/* SPDX-License-Identifier: Apache-2.0
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* Copyright 2011-2023 Blender Foundation */
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#pragma once
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#include "kernel/integrator/path_state.h"
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#include "kernel/integrator/state_util.h"
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CCL_NAMESPACE_BEGIN
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#ifdef __SHADOW_LINKING__
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/* Check whether special shadow rays for shadow linking are needed in the current scene
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* configuration. */
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ccl_device_forceinline bool shadow_linking_scene_need_shadow_ray(KernelGlobals kg,
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IntegratorState state)
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{
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if (!(kernel_data.kernel_features & KERNEL_FEATURE_SHADOW_LINKING)) {
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/* No shadow linking in the scene, so no need to trace any extra rays. */
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return false;
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}
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/* The distant lights might be using shadow linking, and they are not counted as
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* kernel_data.integrator.use_light_mis.
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* So there is a potential to avoid extra rays from being traced, but it requires more granular
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* flags set in the integrator. */
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return true;
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}
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/* Shadow linking re-used the main path intersection to store information about the light to which
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* the extra ray is to be traced (this intersection communicates light between the shadow blocker
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* intersection and shading kernels).
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* These utilities makes a copy of the fields from the main intersection which are needed by the
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* intersect_closest kernel after the surface bounce. */
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ccl_device_forceinline void shadow_linking_store_last_primitives(IntegratorState state)
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{
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INTEGRATOR_STATE_WRITE(state, shadow_link, last_isect_prim) = INTEGRATOR_STATE(
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state, isect, prim);
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INTEGRATOR_STATE_WRITE(state, shadow_link, last_isect_object) = INTEGRATOR_STATE(
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state, isect, object);
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}
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ccl_device_forceinline void shadow_linking_restore_last_primitives(IntegratorState state)
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{
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INTEGRATOR_STATE_WRITE(state, isect, prim) = INTEGRATOR_STATE(
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state, shadow_link, last_isect_prim);
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INTEGRATOR_STATE_WRITE(state, isect, object) = INTEGRATOR_STATE(
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state, shadow_link, last_isect_object);
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}
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/* Schedule shadow linking intersection kernel if it is needed.
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* Returns true if the shadow linking specific kernel has been scheduled, false otherwise. */
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template<DeviceKernel current_kernel>
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ccl_device_inline bool shadow_linking_schedule_intersection_kernel(KernelGlobals kg,
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IntegratorState state)
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{
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if (!shadow_linking_scene_need_shadow_ray(kg, state)) {
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return false;
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}
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integrator_path_next(
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kg, state, current_kernel, DEVICE_KERNEL_INTEGRATOR_INTERSECT_DEDICATED_LIGHT);
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return true;
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}
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#endif /* __SHADOW_LINKING__ */
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CCL_NAMESPACE_END
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