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/*
* Copyright 2011-2016 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
CCL_NAMESPACE_BEGIN
/* This kernel enqueues rays of different ray state into their
* appropriate queues:
*
* 1. Rays that have been determined to hit the background from the
* "kernel_scene_intersect" kernel are enqueued in
* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS;
* 2. Rays that have been determined to be actively participating in pat
* -iteration will be enqueued into QUEUE_ACTIVE_AND_REGENERATED_RAYS.
*
* State of queue during other times this kernel is called:
* At entry,
* - QUEUE_ACTIVE_AND_REGENERATED_RAYS will be empty.
* - QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will contain RAY_TO_REGENERATE
* and RAY_UPDATE_BUFFER rays.
* At exit,
* - QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE rays.
* - QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be filled with
* RAY_TO_REGENERATE, RAY_UPDATE_BUFFER, RAY_HIT_BACKGROUND rays.
*/
ccl_device void kernel_queue_enqueue(KernelGlobals *kg, ccl_local_param QueueEnqueueLocals *locals)
{
/* We have only 2 cases (Hit/Not-Hit) */
int lidx = ccl_local_id(1) * ccl_local_size(0) + ccl_local_id(0);
int ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0);
if (lidx == 0) {
locals->queue_atomics[0] = 0;
locals->queue_atomics[1] = 0;
}
ccl_barrier(CCL_LOCAL_MEM_FENCE);
int queue_number = -1;
if (IS_STATE(kernel_split_state.ray_state, ray_index, RAY_HIT_BACKGROUND) ||
IS_STATE(kernel_split_state.ray_state, ray_index, RAY_UPDATE_BUFFER) ||
IS_STATE(kernel_split_state.ray_state, ray_index, RAY_TO_REGENERATE)) {
queue_number = QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS;
}
else if (IS_STATE(kernel_split_state.ray_state, ray_index, RAY_ACTIVE) ||
IS_STATE(kernel_split_state.ray_state, ray_index, RAY_HAS_ONLY_VOLUME) ||
IS_STATE(kernel_split_state.ray_state, ray_index, RAY_REGENERATED)) {
queue_number = QUEUE_ACTIVE_AND_REGENERATED_RAYS;
}
unsigned int my_lqidx;
if (queue_number != -1) {
my_lqidx = get_local_queue_index(queue_number, locals->queue_atomics);
}
ccl_barrier(CCL_LOCAL_MEM_FENCE);
if (lidx == 0) {
locals->queue_atomics[QUEUE_ACTIVE_AND_REGENERATED_RAYS] = get_global_per_queue_offset(
QUEUE_ACTIVE_AND_REGENERATED_RAYS, locals->queue_atomics, kernel_split_params.queue_index);
locals->queue_atomics[QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS] = get_global_per_queue_offset(
QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS,
locals->queue_atomics,
kernel_split_params.queue_index);
}
ccl_barrier(CCL_LOCAL_MEM_FENCE);
unsigned int my_gqidx;
if (queue_number != -1) {
my_gqidx = get_global_queue_index(
queue_number, kernel_split_params.queue_size, my_lqidx, locals->queue_atomics);
kernel_split_state.queue_data[my_gqidx] = ray_index;
}
}
CCL_NAMESPACE_END
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