forked from bartvdbraak/blender
97 lines
4.5 KiB
C
97 lines
4.5 KiB
C
/*
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* Copyright 2011-2015 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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#include "kernel_split_common.h"
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/* Note on kernel_shadow_blocked kernel.
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* This is the ninth kernel in the ray tracing logic. This is the eighth
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* of the path iteration kernels. This kernel takes care of "shadow ray cast"
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* logic of the direct lighting and AO part of ray tracing.
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*
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* The input and output are as follows,
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*
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* PathState_coop ----------------------------------|--- kernel_shadow_blocked --|
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* LightRay_dl_coop --------------------------------| |--- LightRay_dl_coop
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* LightRay_ao_coop --------------------------------| |--- LightRay_ao_coop
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* ray_state ---------------------------------------| |--- ray_state
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* Queue_data(QUEUE_SHADOW_RAY_CAST_AO_RAYS & | |--- Queue_data (QUEUE_SHADOW_RAY_CAST_AO_RAYS & QUEUE_SHADOW_RAY_CAST_AO_RAYS)
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QUEUE_SHADOW_RAY_CAST_DL_RAYS) -------| |
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* Queue_index(QUEUE_SHADOW_RAY_CAST_AO_RAYS&
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QUEUE_SHADOW_RAY_CAST_DL_RAYS) -------| |
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* kg (globals) ------------------------------------| |
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* queuesize ---------------------------------------| |
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*
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* Note on sd_shadow : sd_shadow is neither input nor output to this kernel. sd_shadow is filled and consumed in this kernel itself.
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* Note on queues :
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* The kernel fetches from QUEUE_SHADOW_RAY_CAST_AO_RAYS and QUEUE_SHADOW_RAY_CAST_DL_RAYS queues. We will empty
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* these queues this kernel.
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* State of queues when this kernel is called :
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* state of queues QUEUE_ACTIVE_AND_REGENERATED_RAYS and QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be same
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* before and after this kernel call.
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* QUEUE_SHADOW_RAY_CAST_AO_RAYS & QUEUE_SHADOW_RAY_CAST_DL_RAYS will be filled with rays marked with flags RAY_SHADOW_RAY_CAST_AO
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* and RAY_SHADOW_RAY_CAST_DL respectively, during kernel entry.
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* QUEUE_SHADOW_RAY_CAST_AO_RAYS and QUEUE_SHADOW_RAY_CAST_DL_RAYS will be empty at kernel exit.
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*/
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ccl_device void kernel_shadow_blocked(
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KernelGlobals *kg,
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ShaderData *sd_shadow, /* Required for shadow blocked */
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ccl_global PathState *PathState_coop, /* Required for shadow blocked */
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ccl_global Ray *LightRay_dl_coop, /* Required for direct lighting's shadow blocked */
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ccl_global Ray *LightRay_ao_coop, /* Required for AO's shadow blocked */
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Intersection *Intersection_coop_AO,
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Intersection *Intersection_coop_DL,
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ccl_global char *ray_state,
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int total_num_rays,
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char shadow_blocked_type,
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int ray_index)
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{
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/* Flag determining if we need to update L. */
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char update_path_radiance = 0;
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if(IS_FLAG(ray_state, ray_index, RAY_SHADOW_RAY_CAST_DL) ||
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IS_FLAG(ray_state, ray_index, RAY_SHADOW_RAY_CAST_AO))
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{
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ccl_global PathState *state = &PathState_coop[ray_index];
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ccl_global Ray *light_ray_dl_global = &LightRay_dl_coop[ray_index];
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ccl_global Ray *light_ray_ao_global = &LightRay_ao_coop[ray_index];
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Intersection *isect_ao_global = &Intersection_coop_AO[ray_index];
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Intersection *isect_dl_global = &Intersection_coop_DL[ray_index];
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ccl_global Ray *light_ray_global =
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shadow_blocked_type == RAY_SHADOW_RAY_CAST_AO
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? light_ray_ao_global
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: light_ray_dl_global;
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Intersection *isect_global =
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shadow_blocked_type == RAY_SHADOW_RAY_CAST_AO
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? isect_ao_global
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: isect_dl_global;
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float3 shadow;
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update_path_radiance = !(shadow_blocked(kg,
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state,
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light_ray_global,
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&shadow,
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sd_shadow,
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isect_global));
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/* We use light_ray_global's P and t to store shadow and
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* update_path_radiance.
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*/
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light_ray_global->P = shadow;
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light_ray_global->t = update_path_radiance;
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}
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}
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