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/*
* Copyright 2011-2015 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.
*/
#include "../../kernel_compat_opencl.h"
#include "../../kernel_math.h"
#include "../../kernel_types.h"
#include "../../kernel_globals.h"
#include "../../kernel_queues.h"
/*
* The kernel "kernel_queue_enqueue" 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 path-iteration will be enqueued into QUEUE_ACTIVE_AND_REGENERATED_RAYS.
*
* The input and output of the kernel is as follows,
*
* ray_state -------------------------------------------|--- kernel_queue_enqueue --|--- Queue_data (QUEUE_ACTIVE_AND_REGENERATED_RAYS & QUEUE_HITBF_BUFF_UPDATE_TOREGEN_RAYS)
* Queue_index(QUEUE_ACTIVE_AND_REGENERATED_RAYS) ------| |--- Queue_index (QUEUE_ACTIVE_AND_REGENERATED_RAYS & QUEUE_HITBF_BUFF_UPDATE_TOREGEN_RAYS)
* Queue_index(QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS) ---| |
* queuesize -------------------------------------------| |
*
* Note on Queues :
* State of queues during the first time this kernel is called :
* At entry,
* Both QUEUE_ACTIVE_AND_REGENERATED_RAYS and QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be empty.
* At exit,
* QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE rays
* QUEUE_HITBF_BUFF_UPDATE_TOREGEN_RAYS will be filled with RAY_HIT_BACKGROUND 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.
*/
__kernel void kernel_ocl_path_trace_queue_enqueue(
ccl_global int *Queue_data, /* Queue memory */
ccl_global int *Queue_index, /* Tracks the number of elements in each queue */
ccl_global char *ray_state, /* Denotes the state of each ray */
int queuesize) /* Size (capacity) of each queue */
{
/* We have only 2 cases (Hit/Not-Hit) */
ccl_local unsigned int local_queue_atomics[2];
int lidx = get_local_id(1) * get_local_size(0) + get_local_id(0);
int ray_index = get_global_id(1) * get_global_size(0) + get_global_id(0);
if(lidx < 2 ) {
local_queue_atomics[lidx] = 0;
}
barrier(CLK_LOCAL_MEM_FENCE);
int queue_number = -1;
if(IS_STATE(ray_state, ray_index, RAY_HIT_BACKGROUND)) {
queue_number = QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS;
}
else if(IS_STATE(ray_state, ray_index, RAY_ACTIVE)) {
queue_number = QUEUE_ACTIVE_AND_REGENERATED_RAYS;
}
unsigned int my_lqidx;
if(queue_number != -1) {
my_lqidx = get_local_queue_index(queue_number, local_queue_atomics);
}
barrier(CLK_LOCAL_MEM_FENCE);
if(lidx == 0) {
local_queue_atomics[QUEUE_ACTIVE_AND_REGENERATED_RAYS] =
get_global_per_queue_offset(QUEUE_ACTIVE_AND_REGENERATED_RAYS,
local_queue_atomics,
Queue_index);
local_queue_atomics[QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS] =
get_global_per_queue_offset(QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS,
local_queue_atomics,
Queue_index);
}
barrier(CLK_LOCAL_MEM_FENCE);
unsigned int my_gqidx;
if(queue_number != -1) {
my_gqidx = get_global_queue_index(queue_number,
queuesize,
my_lqidx,
local_queue_atomics);
Queue_data[my_gqidx] = ray_index;
}
}
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