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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup bmesh
*
* Edge-Split.
*/
#include "MEM_guardedalloc.h"
#include "BLI_utildefines.h"
#include "bmesh.h"
#include "bmesh_edgesplit.h" /* own include */
void BM_mesh_edgesplit(BMesh *bm,
const bool use_verts,
const bool tag_only,
const bool copy_select)
{
BMIter iter;
BMEdge *e;
bool use_ese = false;
GHash *ese_gh = NULL;
if (copy_select && bm->selected.first) {
BMEditSelection *ese;
ese_gh = BLI_ghash_ptr_new(__func__);
for (ese = bm->selected.first; ese; ese = ese->next) {
if (ese->htype != BM_FACE) {
BLI_ghash_insert(ese_gh, ese->ele, ese);
}
}
use_ese = true;
}
if (tag_only == false) {
BM_mesh_elem_hflag_enable_all(bm, BM_EDGE | (use_verts ? BM_VERT : 0), BM_ELEM_TAG, false);
}
if (use_verts) {
/* prevent one edge having both verts unflagged
* we could alternately disable these edges, either way its a corner case.
*
* This is needed so we don't split off the edge but then none of its verts which
* would leave a duplicate edge.
*/
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
if (BM_elem_flag_test(e, BM_ELEM_TAG)) {
if (UNLIKELY(((BM_elem_flag_test(e->v1, BM_ELEM_TAG) == false) &&
(BM_elem_flag_test(e->v2, BM_ELEM_TAG) == false)))) {
BM_elem_flag_enable(e->v1, BM_ELEM_TAG);
BM_elem_flag_enable(e->v2, BM_ELEM_TAG);
}
}
}
}
else {
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
if (BM_elem_flag_test(e, BM_ELEM_TAG)) {
BM_elem_flag_enable(e->v1, BM_ELEM_TAG);
BM_elem_flag_enable(e->v2, BM_ELEM_TAG);
}
}
}
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
if (BM_elem_flag_test(e, BM_ELEM_TAG)) {
uint i;
for (i = 0; i < 2; i++) {
BMVert *v = ((&e->v1)[i]);
if (BM_elem_flag_test(v, BM_ELEM_TAG)) {
BM_elem_flag_disable(v, BM_ELEM_TAG);
if (use_ese) {
BMVert **vtar;
int vtar_len;
BM_vert_separate_hflag(bm, v, BM_ELEM_TAG, copy_select, &vtar, &vtar_len);
/* first value is always in 'v' */
if (vtar_len > 1) {
BMEditSelection *ese = BLI_ghash_lookup(ese_gh, v);
BLI_assert(v == vtar[0]);
if (UNLIKELY(ese)) {
int j;
for (j = 1; j < vtar_len; j++) {
BLI_assert(v != vtar[j]);
BM_select_history_store_after_notest(bm, ese, vtar[j]);
}
}
}
MEM_freeN(vtar);
}
else {
BM_vert_separate_hflag(bm, v, BM_ELEM_TAG, copy_select, NULL, NULL);
}
}
}
}
}
#ifndef NDEBUG
/* ensure we don't have any double edges! */
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
if (BM_elem_flag_test(e, BM_ELEM_TAG)) {
BLI_assert(BM_edge_find_double(e) == NULL);
}
}
#endif
if (use_ese) {
BLI_ghash_free(ese_gh, NULL, NULL);
}
}
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