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/*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* 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.
*
* The Original Code is Copyright (C) 2005 Blender Foundation.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): Blender Foundation.
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/blenkernel/intern/mesh_runtime.c
* \ingroup bke
*/
#include "atomic_ops.h"
#include "MEM_guardedalloc.h"
#include "DNA_mesh_types.h"
#include "DNA_meshdata_types.h"
#include "BLI_math_geom.h"
#include "BLI_threads.h"
#include "BKE_mesh.h"
static ThreadRWMutex loops_cache_lock = PTHREAD_RWLOCK_INITIALIZER;
/* This is a ported copy of DM_ensure_looptri_data(dm) */
/**
* Ensure the array is large enough
*
* /note This function must always be thread-protected by caller. It should only be used by internal code.
*/
static void mesh_ensure_looptri_data(Mesh *mesh)
{
const unsigned int totpoly = mesh->totpoly;
const int looptris_num = poly_to_tri_count(totpoly, mesh->totloop);
BLI_assert(mesh->runtime.looptris.array_wip == NULL);
SWAP(MLoopTri *, mesh->runtime.looptris.array, mesh->runtime.looptris.array_wip);
if ((looptris_num > mesh->runtime.looptris.num_alloc) ||
(looptris_num < mesh->runtime.looptris.num_alloc * 2) ||
(totpoly == 0))
{
MEM_SAFE_FREE(mesh->runtime.looptris.array_wip);
mesh->runtime.looptris.num_alloc = 0;
mesh->runtime.looptris.num = 0;
}
if (totpoly) {
if (mesh->runtime.looptris.array_wip == NULL) {
mesh->runtime.looptris.array_wip = MEM_malloc_arrayN(looptris_num, sizeof(*mesh->runtime.looptris.array_wip), __func__);
mesh->runtime.looptris.num_alloc = looptris_num;
}
mesh->runtime.looptris.num = looptris_num;
}
}
/* This is a ported copy of CDDM_recalc_looptri(dm). */
void BKE_mesh_runtime_recalc_looptri(Mesh *mesh)
{
mesh_ensure_looptri_data(mesh);
BLI_assert(mesh->totpoly == 0 || mesh->runtime.looptris.array_wip != NULL);
BKE_mesh_recalc_looptri(
mesh->mloop, mesh->mpoly,
mesh->mvert,
mesh->totloop, mesh->totpoly,
mesh->runtime.looptris.array_wip);
BLI_assert(mesh->runtime.looptris.array == NULL);
atomic_cas_ptr((void **)&mesh->runtime.looptris.array, mesh->runtime.looptris.array, mesh->runtime.looptris.array_wip);
mesh->runtime.looptris.array_wip = NULL;
}
/* This is a ported copy of dm_getNumLoopTri(dm). */
int BKE_mesh_get_looptri_num(Mesh *mesh)
{
const int numlooptris = poly_to_tri_count(mesh->totpoly, mesh->totloop);
BLI_assert(ELEM(mesh->runtime.looptris.num, 0, numlooptris));
return numlooptris;
}
/* This is a ported copy of dm_getLoopTriArray(dm). */
const MLoopTri *BKE_mesh_get_looptri_array(Mesh *mesh)
{
MLoopTri *looptri;
BLI_rw_mutex_lock(&loops_cache_lock, THREAD_LOCK_READ);
looptri = mesh->runtime.looptris.array;
BLI_rw_mutex_unlock(&loops_cache_lock);
if (looptri != NULL) {
BLI_assert(BKE_mesh_get_looptri_num(mesh) == mesh->runtime.looptris.num);
}
else {
BLI_rw_mutex_lock(&loops_cache_lock, THREAD_LOCK_WRITE);
/* We need to ensure array is still NULL inside mutex-protected code, some other thread might have already
* recomputed those looptris. */
if (mesh->runtime.looptris.array == NULL) {
BKE_mesh_runtime_recalc_looptri(mesh);
}
looptri = mesh->runtime.looptris.array;
BLI_rw_mutex_unlock(&loops_cache_lock);
}
return looptri;
}
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