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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "MEM_guardedalloc.h"
#include "BLI_task.h"
#include "BLI_threads.h"
#include "BKE_pbvh.h"
#include "atomic_ops.h"
#ifdef WITH_TBB
# include <tbb/tbb.h>
/* Functor for running TBB parallel_for and parallel_reduce. */
struct PBVHTask {
PBVHParallelRangeFunc func;
void *userdata;
const PBVHParallelSettings *settings;
void *userdata_chunk;
/* Root constructor. */
PBVHTask(PBVHParallelRangeFunc func, void *userdata, const PBVHParallelSettings *settings)
: func(func), userdata(userdata), settings(settings)
{
init_chunk(settings->userdata_chunk);
}
/* Copy constructor. */
PBVHTask(const PBVHTask &other)
: func(other.func), userdata(other.userdata), settings(other.settings)
{
init_chunk(other.userdata_chunk);
}
/* Splitting constructor for parallel reduce. */
PBVHTask(PBVHTask &other, tbb::split)
: func(other.func), userdata(other.userdata), settings(other.settings)
{
init_chunk(settings->userdata_chunk);
}
~PBVHTask()
{
MEM_SAFE_FREE(userdata_chunk);
}
void init_chunk(void *from_chunk)
{
if (from_chunk) {
userdata_chunk = MEM_mallocN(settings->userdata_chunk_size, "PBVHTask");
memcpy(userdata_chunk, from_chunk, settings->userdata_chunk_size);
}
else {
userdata_chunk = NULL;
}
}
void operator()(const tbb::blocked_range<int> &r) const
{
TaskParallelTLS tls;
tls.thread_id = get_thread_id();
tls.userdata_chunk = userdata_chunk;
for (int i = r.begin(); i != r.end(); ++i) {
func(userdata, i, &tls);
}
}
void join(const PBVHTask &other)
{
settings->func_reduce(userdata, userdata_chunk, other.userdata_chunk);
}
int get_thread_id() const
{
/* Get a unique thread ID for texture nodes. In the future we should get rid
* of the thread ID and change texture evaluation to not require per-thread
* storage that can't be efficiently allocated on the stack. */
static tbb::enumerable_thread_specific<int> pbvh_thread_id(-1);
static int pbvh_thread_id_counter = 0;
int &thread_id = pbvh_thread_id.local();
if (thread_id == -1) {
thread_id = atomic_fetch_and_add_int32(&pbvh_thread_id_counter, 1);
if (thread_id >= BLENDER_MAX_THREADS) {
BLI_assert(!"Maximum number of threads exceeded for sculpting");
thread_id = thread_id % BLENDER_MAX_THREADS;
}
}
return thread_id;
}
};
#endif
void BKE_pbvh_parallel_range(const int start,
const int stop,
void *userdata,
PBVHParallelRangeFunc func,
const struct PBVHParallelSettings *settings)
{
#ifdef WITH_TBB
/* Multithreading. */
if (settings->use_threading) {
PBVHTask task(func, userdata, settings);
if (settings->func_reduce) {
parallel_reduce(tbb::blocked_range<int>(start, stop), task);
if (settings->userdata_chunk) {
memcpy(settings->userdata_chunk, task.userdata_chunk, settings->userdata_chunk_size);
}
}
else {
parallel_for(tbb::blocked_range<int>(start, stop), task);
}
return;
}
#endif
/* Single threaded. Nothing to reduce as everything is accumulated into the
* main userdata chunk directly. */
TaskParallelTLS tls;
tls.thread_id = 0;
tls.userdata_chunk = settings->userdata_chunk;
for (int i = start; i < stop; i++) {
func(userdata, i, &tls);
}
}
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