/* Get the vertex's unique ID from the log */
static unsigned int bm_log_vert_id_get(BMLog *log, BMVert *v)
{
BLI_assert(BLI_ghash_haskey(log->elem_to_id, v));
return GET_UINT_FROM_POINTER(BLI_ghash_lookup(log->elem_to_id, v));
}
/* Get the face's unique ID from the log */
static unsigned int bm_log_face_id_get(BMLog *log, BMFace *f)
{
BLI_assert(BLI_ghash_haskey(log->elem_to_id, f));
return GET_UINT_FROM_POINTER(BLI_ghash_lookup(log->elem_to_id, f));
}
static DerivedMesh *applyModifier(
ModifierData *md, Object *ob,
DerivedMesh *dm,
ModifierApplyFlag UNUSED(flag))
{
MaskModifierData *mmd = (MaskModifierData *)md;
const bool found_test = (mmd->flag & MOD_MASK_INV) == 0;
DerivedMesh *result = NULL;
GHash *vertHash = NULL, *edgeHash, *polyHash;
GHashIterator gh_iter;
MDeformVert *dvert, *dv;
int numPolys = 0, numLoops = 0, numEdges = 0, numVerts = 0;
int maxVerts, maxEdges, maxPolys;
int i;
const MVert *mvert_src;
const MEdge *medge_src;
const MPoly *mpoly_src;
const MLoop *mloop_src;
MPoly *mpoly_dst;
MLoop *mloop_dst;
MEdge *medge_dst;
MVert *mvert_dst;
int *loop_mapping;
dvert = dm->getVertDataArray(dm, CD_MDEFORMVERT);
if (dvert == NULL) {
return found_test ? CDDM_from_template(dm, 0, 0, 0, 0, 0) : dm;
}
/* Overview of Method:
* 1. Get the vertices that are in the vertexgroup of interest
* 2. Filter out unwanted geometry (i.e. not in vertexgroup), by populating mappings with new vs old indices
* 3. Make a new mesh containing only the mapping data
*/
/* get original number of verts, edges, and faces */
maxVerts = dm->getNumVerts(dm);
maxEdges = dm->getNumEdges(dm);
maxPolys = dm->getNumPolys(dm);
/* check if we can just return the original mesh
* - must have verts and therefore verts assigned to vgroups to do anything useful
*/
if (!(ELEM(mmd->mode, MOD_MASK_MODE_ARM, MOD_MASK_MODE_VGROUP)) ||
(maxVerts == 0) || BLI_listbase_is_empty(&ob->defbase))
{
return dm;
}
/* if mode is to use selected armature bones, aggregate the bone groups */
if (mmd->mode == MOD_MASK_MODE_ARM) { /* --- using selected bones --- */
Object *oba = mmd->ob_arm;
bPoseChannel *pchan;
bDeformGroup *def;
bool *bone_select_array;
int bone_select_tot = 0;
const int defbase_tot = BLI_listbase_count(&ob->defbase);
/* check that there is armature object with bones to use, otherwise return original mesh */
if (ELEM(NULL, oba, oba->pose, ob->defbase.first))
return dm;
/* determine whether each vertexgroup is associated with a selected bone or not
* - each cell is a boolean saying whether bone corresponding to the ith group is selected
* - groups that don't match a bone are treated as not existing (along with the corresponding ungrouped verts)
*/
bone_select_array = MEM_malloc_arrayN((size_t)defbase_tot, sizeof(char), "mask array");
for (i = 0, def = ob->defbase.first; def; def = def->next, i++) {
pchan = BKE_pose_channel_find_name(oba->pose, def->name);
if (pchan && pchan->bone && (pchan->bone->flag & BONE_SELECTED)) {
bone_select_array[i] = true;
bone_select_tot++;
}
else {
bone_select_array[i] = false;
}
}
/* verthash gives mapping from original vertex indices to the new indices (including selected matches only)
* key = oldindex, value = newindex
*/
vertHash = BLI_ghash_int_new_ex("mask vert gh", (unsigned int)maxVerts);
/* add vertices which exist in vertexgroups into vertHash for filtering
* - dv = for each vertex, what vertexgroups does it belong to
* - dw = weight that vertex was assigned to a vertexgroup it belongs to
*/
for (i = 0, dv = dvert; i < maxVerts; i++, dv++) {
MDeformWeight *dw = dv->dw;
bool found = false;
int j;
/* check the groups that vertex is assigned to, and see if it was any use */
for (j = 0; j < dv->totweight; j++, dw++) {
if (dw->def_nr < defbase_tot) {
if (bone_select_array[dw->def_nr]) {
if (dw->weight != 0.0f) {
found = true;
break;
}
}
}
}
if (found_test != found) {
continue;
}
/* add to ghash for verts (numVerts acts as counter for mapping) */
BLI_ghash_insert(vertHash, SET_INT_IN_POINTER(i), SET_INT_IN_POINTER(numVerts));
numVerts++;
}
/* free temp hashes */
MEM_freeN(bone_select_array);
}
else { /* --- Using Nominated VertexGroup only --- */
int defgrp_index = defgroup_name_index(ob, mmd->vgroup);
/* if no vgroup (i.e. dverts) found, return the initial mesh */
if (defgrp_index == -1)
return dm;
/* hashes for quickly providing a mapping from old to new - use key=oldindex, value=newindex */
vertHash = BLI_ghash_int_new_ex("mask vert2 bh", (unsigned int)maxVerts);
/* add vertices which exist in vertexgroup into ghash for filtering */
for (i = 0, dv = dvert; i < maxVerts; i++, dv++) {
const bool found = defvert_find_weight(dv, defgrp_index) != 0.0f;
if (found_test != found) {
continue;
}
/* add to ghash for verts (numVerts acts as counter for mapping) */
BLI_ghash_insert(vertHash, SET_INT_IN_POINTER(i), SET_INT_IN_POINTER(numVerts));
numVerts++;
}
}
/* hashes for quickly providing a mapping from old to new - use key=oldindex, value=newindex */
edgeHash = BLI_ghash_int_new_ex("mask ed2 gh", (unsigned int)maxEdges);
polyHash = BLI_ghash_int_new_ex("mask fa2 gh", (unsigned int)maxPolys);
mvert_src = dm->getVertArray(dm);
medge_src = dm->getEdgeArray(dm);
mpoly_src = dm->getPolyArray(dm);
mloop_src = dm->getLoopArray(dm);
/* overalloc, assume all polys are seen */
loop_mapping = MEM_malloc_arrayN((size_t)maxPolys, sizeof(int), "mask loopmap");
/* loop over edges and faces, and do the same thing to
* ensure that they only reference existing verts
*/
for (i = 0; i < maxEdges; i++) {
const MEdge *me = &medge_src[i];
/* only add if both verts will be in new mesh */
if (BLI_ghash_haskey(vertHash, SET_INT_IN_POINTER(me->v1)) &&
BLI_ghash_haskey(vertHash, SET_INT_IN_POINTER(me->v2)))
{
BLI_ghash_insert(edgeHash, SET_INT_IN_POINTER(i), SET_INT_IN_POINTER(numEdges));
numEdges++;
}
}
for (i = 0; i < maxPolys; i++) {
const MPoly *mp_src = &mpoly_src[i];
const MLoop *ml_src = &mloop_src[mp_src->loopstart];
bool ok = true;
int j;
for (j = 0; j < mp_src->totloop; j++, ml_src++) {
if (!BLI_ghash_haskey(vertHash, SET_INT_IN_POINTER(ml_src->v))) {
ok = false;
break;
}
}
/* all verts must be available */
if (ok) {
BLI_ghash_insert(polyHash, SET_INT_IN_POINTER(i), SET_INT_IN_POINTER(numPolys));
loop_mapping[numPolys] = numLoops;
numPolys++;
numLoops += mp_src->totloop;
}
}
/* now we know the number of verts, edges and faces,
* we can create the new (reduced) mesh
*/
result = CDDM_from_template(dm, numVerts, numEdges, 0, numLoops, numPolys);
mpoly_dst = CDDM_get_polys(result);
mloop_dst = CDDM_get_loops(result);
medge_dst = CDDM_get_edges(result);
mvert_dst = CDDM_get_verts(result);
/* using ghash-iterators, map data into new mesh */
/* vertices */
GHASH_ITER (gh_iter, vertHash) {
const MVert *v_src;
MVert *v_dst;
const int i_src = GET_INT_FROM_POINTER(BLI_ghashIterator_getKey(&gh_iter));
const int i_dst = GET_INT_FROM_POINTER(BLI_ghashIterator_getValue(&gh_iter));
v_src = &mvert_src[i_src];
v_dst = &mvert_dst[i_dst];
*v_dst = *v_src;
DM_copy_vert_data(dm, result, i_src, i_dst, 1);
}
/* edges */
GHASH_ITER (gh_iter, edgeHash) {
const MEdge *e_src;
MEdge *e_dst;
const int i_src = GET_INT_FROM_POINTER(BLI_ghashIterator_getKey(&gh_iter));
const int i_dst = GET_INT_FROM_POINTER(BLI_ghashIterator_getValue(&gh_iter));
e_src = &medge_src[i_src];
e_dst = &medge_dst[i_dst];
DM_copy_edge_data(dm, result, i_src, i_dst, 1);
*e_dst = *e_src;
e_dst->v1 = GET_UINT_FROM_POINTER(BLI_ghash_lookup(vertHash, SET_UINT_IN_POINTER(e_src->v1)));
e_dst->v2 = GET_UINT_FROM_POINTER(BLI_ghash_lookup(vertHash, SET_UINT_IN_POINTER(e_src->v2)));
}
/* faces */
GHASH_ITER (gh_iter, polyHash) {
const int i_src = GET_INT_FROM_POINTER(BLI_ghashIterator_getKey(&gh_iter));
const int i_dst = GET_INT_FROM_POINTER(BLI_ghashIterator_getValue(&gh_iter));
const MPoly *mp_src = &mpoly_src[i_src];
MPoly *mp_dst = &mpoly_dst[i_dst];
const int i_ml_src = mp_src->loopstart;
const int i_ml_dst = loop_mapping[i_dst];
const MLoop *ml_src = &mloop_src[i_ml_src];
MLoop *ml_dst = &mloop_dst[i_ml_dst];
DM_copy_poly_data(dm, result, i_src, i_dst, 1);
DM_copy_loop_data(dm, result, i_ml_src, i_ml_dst, mp_src->totloop);
*mp_dst = *mp_src;
mp_dst->loopstart = i_ml_dst;
for (i = 0; i < mp_src->totloop; i++) {
ml_dst[i].v = GET_UINT_FROM_POINTER(BLI_ghash_lookup(vertHash, SET_UINT_IN_POINTER(ml_src[i].v)));
ml_dst[i].e = GET_UINT_FROM_POINTER(BLI_ghash_lookup(edgeHash, SET_UINT_IN_POINTER(ml_src[i].e)));
}
}
MEM_freeN(loop_mapping);
/* why is this needed? - campbell */
/* recalculate normals */
result->dirty |= DM_DIRTY_NORMALS;
/* free hashes */
BLI_ghash_free(vertHash, NULL, NULL);
BLI_ghash_free(edgeHash, NULL, NULL);
BLI_ghash_free(polyHash, NULL, NULL);
/* return the new mesh */
return result;
}
