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.
71 lines
3.6 KiB
C
71 lines
3.6 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_shader_eval kernel
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* This kernel is the 5th kernel in the ray tracing logic. This is
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* the 4rd kernel in path iteration. This kernel sets up the ShaderData
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* structure from the values computed by the previous kernels. It also identifies
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* the rays of state RAY_TO_REGENERATE and enqueues them in QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue.
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*
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* The input and output of the kernel is as follows,
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* rng_coop -------------------------------------------|--- kernel_shader_eval --|--- shader_data
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* Ray_coop -------------------------------------------| |--- Queue_data (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
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* PathState_coop -------------------------------------| |--- Queue_index (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
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* Intersection_coop ----------------------------------| |
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* Queue_data (QUEUE_ACTIVE_AND_REGENERATD_RAYS)-------| |
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* Queue_index(QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)---| |
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* ray_state ------------------------------------------| |
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* kg (globals + data) --------------------------------| |
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* queuesize ------------------------------------------| |
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*
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* Note on Queues :
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* This kernel reads from the QUEUE_ACTIVE_AND_REGENERATED_RAYS queue and processes
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* only the rays of state RAY_ACTIVE;
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* State of queues when this kernel is called,
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* at entry,
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* QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE and RAY_REGENERATED rays
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* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be empty.
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* at exit,
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* QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE and RAY_REGENERATED rays
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* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be filled with RAY_TO_REGENERATE rays
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*/
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ccl_device void kernel_shader_eval(
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ccl_global char *globals,
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ccl_constant KernelData *data,
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ccl_global char *shader_data, /* Output ShaderData structure to be filled */
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ccl_global uint *rng_coop, /* Required for rbsdf calculation */
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ccl_global Ray *Ray_coop, /* Required for setting up shader from ray */
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ccl_global PathState *PathState_coop, /* Required for all functions in this kernel */
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Intersection *Intersection_coop, /* Required for setting up shader from ray */
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ccl_global char *ray_state, /* Denotes the state of each ray */
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int ray_index)
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{
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if(IS_STATE(ray_state, ray_index, RAY_ACTIVE)) {
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KernelGlobals *kg = (KernelGlobals *)globals;
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ShaderData *sd = (ShaderData *)shader_data;
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Intersection *isect = &Intersection_coop[ray_index];
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ccl_global uint *rng = &rng_coop[ray_index];
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ccl_global PathState *state = &PathState_coop[ray_index];
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Ray ray = Ray_coop[ray_index];
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shader_setup_from_ray(kg, sd, isect, &ray, state->bounce, state->transparent_bounce);
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float rbsdf = path_state_rng_1D_for_decision(kg, rng, state, PRNG_BSDF);
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shader_eval_surface(kg, sd, rbsdf, state->flag, SHADER_CONTEXT_MAIN);
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}
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}
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