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/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup bmesh
*
* BMesh separate, disconnects a set of faces from all others,
* so they don't share any vertices/edges with other faces.
*/
#include <limits.h>
#include "MEM_guardedalloc.h"
#include "BLI_buffer.h"
#include "BLI_utildefines.h"
#include "bmesh.h"
#include "bmesh_separate.h" /* own include */
#include "intern/bmesh_private.h"
void BM_mesh_separate_faces(BMesh *bm, BMFaceFilterFunc filter_fn, void *user_data)
{
BMFace **faces_array_all = MEM_mallocN(bm->totface * sizeof(BMFace *), __func__);
/*
* - Create an array of faces based on 'filter_fn'.
* First part of array for match, for non-match.
*
* - Enable all vertex tags, then clear all tagged vertices from 'faces_b'.
*
* - Loop over 'faces_a', checking each vertex,
* splitting out any which aren't tagged (and therefor shared), disabling tags as we go.
*/
BMFace *f;
BMIter iter;
uint faces_a_len = 0;
uint faces_b_len = 0;
{
int i_a = 0;
int i_b = bm->totface;
BM_ITER_MESH (f, &iter, bm, BM_FACES_OF_MESH) {
faces_array_all[filter_fn(f, user_data) ? i_a++ : --i_b] = f;
}
faces_a_len = i_a;
faces_b_len = bm->totface - i_a;
}
BMFace **faces_a = faces_array_all;
BMFace **faces_b = faces_array_all + faces_a_len;
/* Enable for all. */
BM_mesh_elem_hflag_enable_all(bm, BM_VERT, BM_ELEM_TAG, false);
/* Disable vert tag on faces_b */
for (uint i = 0; i < faces_b_len; i++) {
BMLoop *l_iter, *l_first;
l_iter = l_first = BM_FACE_FIRST_LOOP(faces_b[i]);
do {
BM_elem_flag_disable(l_iter->v, BM_ELEM_TAG);
} while ((l_iter = l_iter->next) != l_first);
}
BLI_buffer_declare_static(BMLoop **, loop_split, 0, 128);
/* Check shared verts ('faces_a' tag and disable) */
for (uint i = 0; i < faces_a_len; i++) {
BMLoop *l_iter, *l_first;
l_iter = l_first = BM_FACE_FIRST_LOOP(faces_a[i]);
do {
if (!BM_elem_flag_test(l_iter->v, BM_ELEM_TAG)) {
BMVert *v = l_iter->v;
/* Enable, since we may visit this vertex again on other faces */
BM_elem_flag_enable(v, BM_ELEM_TAG);
/* We know the vertex is shared, collect all vertices and split them off. */
/* Fill 'loop_split' */
{
BMEdge *e_first, *e_iter;
e_iter = e_first = l_iter->e;
do {
if (e_iter->l != NULL) {
BMLoop *l_radial_first, *l_radial_iter;
l_radial_first = l_radial_iter = e_iter->l;
do {
if (l_radial_iter->v == v) {
if (filter_fn(l_radial_iter->f, user_data)) {
BLI_buffer_append(&loop_split, BMLoop *, l_radial_iter);
}
}
} while ((l_radial_iter = l_radial_iter->radial_next) != l_radial_first);
}
} while ((e_iter = bmesh_disk_edge_next(e_iter, v)) != e_first);
}
/* Perform the split */
BM_face_loop_separate_multi(bm, loop_split.data, loop_split.count);
BLI_buffer_clear(&loop_split);
}
} while ((l_iter = l_iter->next) != l_first);
}
BLI_buffer_free(&loop_split);
MEM_freeN(faces_array_all);
}
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