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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.
*
* Contributor(s): Campbell Barton
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/bmesh/operators/bmo_edgesplit.c
* \ingroup bmesh
*/
#include "MEM_guardedalloc.h"
#include "BLI_utildefines.h"
#include "bmesh.h"
#include "intern/bmesh_operators_private.h" /* own include */
enum {
EDGE_SEAM = 1
};
enum {
VERT_SEAM = 2
};
/**
* Remove the EDGE_SEAM flag for edges we cant split
*
* un-tag edges not connected to other tagged edges,
* unless they are on a boundary
*/
static void bm_edgesplit_validate_seams(BMesh *bm, BMOperator *op)
{
BMOIter siter;
BMIter iter;
BMEdge *e;
unsigned char *vtouch;
unsigned char *vt;
BM_mesh_elem_index_ensure(bm, BM_VERT);
vtouch = MEM_callocN(sizeof(char) * bm->totvert, __func__);
/* tag all boundary verts so as not to untag an edge which is inbetween only 2 faces [] */
BM_ITER_MESH (e, &iter, bm, BM_EDGES_OF_MESH) {
/* unrelated to flag assignment in this function - since this is the
* only place we loop over all edges, disable tag */
BM_elem_flag_disable(e, BM_ELEM_INTERNAL_TAG);
if (e->l == NULL) {
BMO_elem_flag_disable(bm, e, EDGE_SEAM);
}
else if (BM_edge_is_boundary(e)) {
vt = &vtouch[BM_elem_index_get(e->v1)]; if (*vt < 2) (*vt)++;
vt = &vtouch[BM_elem_index_get(e->v2)]; if (*vt < 2) (*vt)++;
/* while the boundary verts need to be tagged,
* the edge its self can't be split */
BMO_elem_flag_disable(bm, e, EDGE_SEAM);
}
}
/* single marked edges unconnected to any other marked edges
* are illegal, go through and unmark them */
BMO_ITER (e, &siter, bm, op, "edges", BM_EDGE) {
/* lame, but we don't want the count to exceed 255,
* so just count to 2, its all we need */
unsigned char *vt;
vt = &vtouch[BM_elem_index_get(e->v1)]; if (*vt < 2) (*vt)++;
vt = &vtouch[BM_elem_index_get(e->v2)]; if (*vt < 2) (*vt)++;
}
BMO_ITER (e, &siter, bm, op, "edges", BM_EDGE) {
if (vtouch[BM_elem_index_get(e->v1)] == 1 &&
vtouch[BM_elem_index_get(e->v2)] == 1)
{
BMO_elem_flag_disable(bm, e, EDGE_SEAM);
}
}
MEM_freeN(vtouch);
}
/* keep this operator fast, its used in a modifier */
void bmo_split_edges_exec(BMesh *bm, BMOperator *op)
{
BMOIter siter;
BMEdge *e;
const int use_verts = BMO_slot_bool_get(op, "use_verts");
BMO_slot_buffer_flag_enable(bm, op, "edges", BM_EDGE, EDGE_SEAM);
if (use_verts) {
/* this slows down the operation but its ok because the modifier doesn't use */
BMO_slot_buffer_flag_enable(bm, op, "verts", BM_VERT, VERT_SEAM);
/* 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.
*/
BMO_ITER (e, &siter, bm, op, "edges", BM_EDGE) {
if (UNLIKELY((BMO_elem_flag_test(bm, e->v1, VERT_SEAM) == FALSE &&
(BMO_elem_flag_test(bm, e->v2, VERT_SEAM) == FALSE))))
{
BMO_elem_flag_enable(bm, e->v1, VERT_SEAM);
BMO_elem_flag_enable(bm, e->v2, VERT_SEAM);
}
}
}
bm_edgesplit_validate_seams(bm, op);
BMO_ITER (e, &siter, bm, op, "edges", BM_EDGE) {
if (BMO_elem_flag_test(bm, e, EDGE_SEAM)) {
/* this flag gets copied so we can be sure duplicate edges get it too (important) */
BM_elem_flag_enable(e, BM_ELEM_INTERNAL_TAG);
/* keep splitting until each loop has its own edge */
do {
bmesh_edge_separate(bm, e, e->l);
} while (!BM_edge_is_boundary(e));
BM_elem_flag_enable(e->v1, BM_ELEM_TAG);
BM_elem_flag_enable(e->v2, BM_ELEM_TAG);
}
}
if (use_verts) {
BMO_ITER (e, &siter, bm, op, "edges", BM_EDGE) {
if (BMO_elem_flag_test(bm, e->v1, VERT_SEAM) == FALSE) {
BM_elem_flag_disable(e->v1, BM_ELEM_TAG);
}
if (BMO_elem_flag_test(bm, e->v2, VERT_SEAM) == FALSE) {
BM_elem_flag_disable(e->v2, BM_ELEM_TAG);
}
}
}
BMO_ITER (e, &siter, bm, op, "edges", BM_EDGE) {
if (BMO_elem_flag_test(bm, e, EDGE_SEAM)) {
if (BM_elem_flag_test(e->v1, BM_ELEM_TAG)) {
BM_elem_flag_disable(e->v1, BM_ELEM_TAG);
bmesh_vert_separate(bm, e->v1, NULL, NULL);
}
if (BM_elem_flag_test(e->v2, BM_ELEM_TAG)) {
BM_elem_flag_disable(e->v2, BM_ELEM_TAG);
bmesh_vert_separate(bm, e->v2, NULL, NULL);
}
}
}
BMO_slot_buffer_from_enabled_hflag(bm, op, "edgeout", BM_EDGE, BM_ELEM_INTERNAL_TAG);
}
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