forked from bartvdbraak/blender
84ad20acef
This commit re-shuffles code in split kernel once again and makes it so common parts which is in the headers is only responsible to making all the work needed for specified ray index. Getting ray index, checking for it's validity and enqueuing tasks are now happening in the device specified part of the kernel. This actually makes sense because enqueuing is indeed device-specified and i.e. with CUDA we'll want to enqueue kernels from kernel and avoid CPU roundtrip. TODO: - Kernel comments are still placed in the common header files, but since queue related stuff is not passed to those functions those comments might need to be split as well. Just currently read them considering that they're also covering the way how all devices are invoking the common code path. - Arguments might need to be wrapped into KernelGlobals, so we don't ened to pass all them around as function arguments.
100 lines
4.7 KiB
C
100 lines
4.7 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 + data) -----------------------------| |
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* queuesize ---------------------------------------| |
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*
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* Note on shader_shadow : shader_shadow is neither input nor output to this kernel. shader_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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ccl_global char *globals,
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ccl_constant KernelData *data,
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ccl_global char *shader_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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/* Load kernel global structure */
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KernelGlobals *kg = (KernelGlobals *)globals;
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ShaderData *sd_shadow = (ShaderData *)shader_shadow;
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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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RAY_SHADOW_RAY_CAST_AO ? isect_ao_global : 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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