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Fix T52823: New Depsgraph - Shrinkwrap crashes blender 

The issue was caused by threading conflict around looptris: it was possible
that DM will return non-NULL but non-initialized array of looptris.

Thanks Campbell for second pair of eyes!
This commit is contained in:
Sergey Sharybin 2017-09-19 16:09:35 +05:00
parent 00d8097510
commit 754630cee4
1 changed files with 12 additions and 5 deletions
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17
source/blender/blenkernel/intern/DerivedMesh.c
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@ -94,7 +94,7 @@ static DerivedMesh *navmesh_dm_createNavMeshForVisualization(DerivedMesh *dm);
#endif
static ThreadMutex loops_cache_lock = BLI_MUTEX_INITIALIZER;
static ThreadRWMutex loops_cache_lock = PTHREAD_RWLOCK_INITIALIZER;
static void add_shapekey_layers(DerivedMesh *dm, Mesh *me, Object *ob);
@ -241,19 +241,26 @@ static int dm_getNumLoopTri(DerivedMesh *dm)
static const MLoopTri *dm_getLoopTriArray(DerivedMesh *dm)
{
if (dm->looptris.array) {
MLoopTri *looptri;
BLI_rw_mutex_lock(&loops_cache_lock, THREAD_LOCK_READ);
looptri = dm->looptris.array;
BLI_rw_mutex_unlock(&loops_cache_lock);
if (looptri != NULL) {
BLI_assert(dm->getNumLoopTri(dm) == dm->looptris.num);
}
else {
BLI_mutex_lock(&loops_cache_lock);
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 (dm->looptris.array == NULL) {
dm->recalcLoopTri(dm);
}
BLI_mutex_unlock(&loops_cache_lock);
looptri = dm->looptris.array;
BLI_rw_mutex_unlock(&loops_cache_lock);
}
return dm->looptris.array;
return looptri;
}
static CustomData *dm_getVertCData(DerivedMesh *dm)