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blender-archive/source/blender/bmesh/intern/bmesh_core.c
Campbell Barton 4b188bb08c Cleanup: use over-line for doxy comments 
Follow our code style for doxygen sections.
2020-10-27 21:45:55 +11:00

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/*
* 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.
*/
/** \file
* \ingroup bmesh
*
* Core BMesh functions for adding, removing BMesh elements.
*/
#include "MEM_guardedalloc.h"
#include "BLI_alloca.h"
#include "BLI_array.h"
#include "BLI_linklist_stack.h"
#include "BLI_math_vector.h"
#include "BLI_utildefines_stack.h"
#include "BLT_translation.h"
#include "DNA_meshdata_types.h"
#include "BKE_customdata.h"
#include "BKE_mesh.h"
#include "bmesh.h"
#include "intern/bmesh_private.h"
/* use so valgrinds memcheck alerts us when undefined index is used.
* TESTING ONLY! */
// #define USE_DEBUG_INDEX_MEMCHECK
#ifdef USE_DEBUG_INDEX_MEMCHECK
# define DEBUG_MEMCHECK_INDEX_INVALIDATE(ele) \
{ \
int undef_idx; \
BM_elem_index_set(ele, undef_idx); /* set_ok_invalid */ \
} \
(void)0
#endif
/**
* \brief Main function for creating a new vertex.
*/
BMVert *BM_vert_create(BMesh *bm,
const float co[3],
const BMVert *v_example,
const eBMCreateFlag create_flag)
{
BMVert *v = BLI_mempool_alloc(bm->vpool);
BLI_assert((v_example == NULL) || (v_example->head.htype == BM_VERT));
BLI_assert(!(create_flag & 1));
/* --- assign all members --- */
v->head.data = NULL;
#ifdef USE_DEBUG_INDEX_MEMCHECK
DEBUG_MEMCHECK_INDEX_INVALIDATE(v);
#else
BM_elem_index_set(v, -1); /* set_ok_invalid */
#endif
v->head.htype = BM_VERT;
v->head.hflag = 0;
v->head.api_flag = 0;
/* allocate flags */
if (bm->use_toolflags) {
((BMVert_OFlag *)v)->oflags = bm->vtoolflagpool ? BLI_mempool_calloc(bm->vtoolflagpool) : NULL;
}
/* 'v->no' is handled by BM_elem_attrs_copy */
if (co) {
copy_v3_v3(v->co, co);
}
else {
zero_v3(v->co);
}
/* 'v->no' set below */
v->e = NULL;
/* --- done --- */
/* disallow this flag for verts - its meaningless */
BLI_assert((create_flag & BM_CREATE_NO_DOUBLE) == 0);
/* may add to middle of the pool */
bm->elem_index_dirty |= BM_VERT;
bm->elem_table_dirty |= BM_VERT;
bm->spacearr_dirty |= BM_SPACEARR_DIRTY_ALL;
bm->totvert++;
if (!(create_flag & BM_CREATE_SKIP_CD)) {
if (v_example) {
int *keyi;
/* handles 'v->no' too */
BM_elem_attrs_copy(bm, bm, v_example, v);
/* exception: don't copy the original shapekey index */
keyi = CustomData_bmesh_get(&bm->vdata, v->head.data, CD_SHAPE_KEYINDEX);
if (keyi) {
*keyi = ORIGINDEX_NONE;
}
}
else {
CustomData_bmesh_set_default(&bm->vdata, &v->head.data);
zero_v3(v->no);
}
}
else {
if (v_example) {
copy_v3_v3(v->no, v_example->no);
}
else {
zero_v3(v->no);
}
}
BM_CHECK_ELEMENT(v);
return v;
}
/**
* \brief Main function for creating a new edge.
*
* \note Duplicate edges are supported by the API however users should _never_ see them.
* so unless you need a unique edge or know the edge won't exist,
* you should call with \a no_double = true.
*/
BMEdge *BM_edge_create(
BMesh *bm, BMVert *v1, BMVert *v2, const BMEdge *e_example, const eBMCreateFlag create_flag)
{
BMEdge *e;
BLI_assert(v1 != v2);
BLI_assert(v1->head.htype == BM_VERT && v2->head.htype == BM_VERT);
BLI_assert((e_example == NULL) || (e_example->head.htype == BM_EDGE));
BLI_assert(!(create_flag & 1));
if ((create_flag & BM_CREATE_NO_DOUBLE) && (e = BM_edge_exists(v1, v2))) {
return e;
}
e = BLI_mempool_alloc(bm->epool);
/* --- assign all members --- */
e->head.data = NULL;
#ifdef USE_DEBUG_INDEX_MEMCHECK
DEBUG_MEMCHECK_INDEX_INVALIDATE(e);
#else
BM_elem_index_set(e, -1); /* set_ok_invalid */
#endif
e->head.htype = BM_EDGE;
e->head.hflag = BM_ELEM_SMOOTH | BM_ELEM_DRAW;
e->head.api_flag = 0;
/* allocate flags */
if (bm->use_toolflags) {
((BMEdge_OFlag *)e)->oflags = bm->etoolflagpool ? BLI_mempool_calloc(bm->etoolflagpool) : NULL;
}
e->v1 = v1;
e->v2 = v2;
e->l = NULL;
memset(&e->v1_disk_link, 0, sizeof(BMDiskLink[2]));
/* --- done --- */
bmesh_disk_edge_append(e, e->v1);
bmesh_disk_edge_append(e, e->v2);
/* may add to middle of the pool */
bm->elem_index_dirty |= BM_EDGE;
bm->elem_table_dirty |= BM_EDGE;
bm->spacearr_dirty |= BM_SPACEARR_DIRTY_ALL;
bm->totedge++;
if (!(create_flag & BM_CREATE_SKIP_CD)) {
if (e_example) {
BM_elem_attrs_copy(bm, bm, e_example, e);
}
else {
CustomData_bmesh_set_default(&bm->edata, &e->head.data);
}
}
BM_CHECK_ELEMENT(e);
return e;
}
/**
* \note In most cases a \a l_example should be NULL,
* since this is a low level API and we shouldn't attempt to be clever and guess what's intended.
* In cases where copying adjacent loop-data is useful, see #BM_face_copy_shared.
*/
static BMLoop *bm_loop_create(BMesh *bm,
BMVert *v,
BMEdge *e,
BMFace *f,
const BMLoop *l_example,
const eBMCreateFlag create_flag)
{
BMLoop *l = NULL;
l = BLI_mempool_alloc(bm->lpool);
BLI_assert((l_example == NULL) || (l_example->head.htype == BM_LOOP));
BLI_assert(!(create_flag & 1));
#ifndef NDEBUG
if (l_example) {
/* ensure passing a loop is either sharing the same vertex, or entirely disconnected
* use to catch mistake passing in loop offset-by-one. */
BLI_assert((v == l_example->v) || !ELEM(v, l_example->prev->v, l_example->next->v));
}
#endif
/* --- assign all members --- */
l->head.data = NULL;
#ifdef USE_DEBUG_INDEX_MEMCHECK
DEBUG_MEMCHECK_INDEX_INVALIDATE(l);
#else
BM_elem_index_set(l, -1); /* set_ok_invalid */
#endif
l->head.htype = BM_LOOP;
l->head.hflag = 0;
l->head.api_flag = 0;
l->v = v;
l->e = e;
l->f = f;
l->radial_next = NULL;
l->radial_prev = NULL;
l->next = NULL;
l->prev = NULL;
/* --- done --- */
/* may add to middle of the pool */
bm->elem_index_dirty |= BM_LOOP;
bm->spacearr_dirty |= BM_SPACEARR_DIRTY_ALL;
bm->totloop++;
if (!(create_flag & BM_CREATE_SKIP_CD)) {
if (l_example) {
/* no need to copy attrs, just handle customdata */
// BM_elem_attrs_copy(bm, bm, l_example, l);
CustomData_bmesh_free_block_data(&bm->ldata, l->head.data);
CustomData_bmesh_copy_data(&bm->ldata, &bm->ldata, l_example->head.data, &l->head.data);
}
else {
CustomData_bmesh_set_default(&bm->ldata, &l->head.data);
}
}
return l;
}
static BMLoop *bm_face_boundary_add(
BMesh *bm, BMFace *f, BMVert *startv, BMEdge *starte, const eBMCreateFlag create_flag)
{
#ifdef USE_BMESH_HOLES
BMLoopList *lst = BLI_mempool_calloc(bm->looplistpool);
#endif
BMLoop *l = bm_loop_create(bm, startv, starte, f, NULL /* starte->l */, create_flag);
bmesh_radial_loop_append(starte, l);
#ifdef USE_BMESH_HOLES
lst->first = lst->last = l;
BLI_addtail(&f->loops, lst);
#else
f->l_first = l;
#endif
return l;
}
BMFace *BM_face_copy(
BMesh *bm_dst, BMesh *bm_src, BMFace *f, const bool copy_verts, const bool copy_edges)
{
BMVert **verts = BLI_array_alloca(verts, f->len);
BMEdge **edges = BLI_array_alloca(edges, f->len);
BMLoop *l_iter;
BMLoop *l_first;
BMLoop *l_copy;
BMFace *f_copy;
int i;
BLI_assert((bm_dst == bm_src) || (copy_verts && copy_edges));
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
i = 0;
do {
if (copy_verts) {
verts[i] = BM_vert_create(bm_dst, l_iter->v->co, l_iter->v, BM_CREATE_NOP);
}
else {
verts[i] = l_iter->v;
}
i++;
} while ((l_iter = l_iter->next) != l_first);
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
i = 0;
do {
if (copy_edges) {
BMVert *v1, *v2;
if (l_iter->e->v1 == verts[i]) {
v1 = verts[i];
v2 = verts[(i + 1) % f->len];
}
else {
v2 = verts[i];
v1 = verts[(i + 1) % f->len];
}
edges[i] = BM_edge_create(bm_dst, v1, v2, l_iter->e, BM_CREATE_NOP);
}
else {
edges[i] = l_iter->e;
}
i++;
} while ((l_iter = l_iter->next) != l_first);
f_copy = BM_face_create(bm_dst, verts, edges, f->len, NULL, BM_CREATE_SKIP_CD);
BM_elem_attrs_copy(bm_src, bm_dst, f, f_copy);
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
l_copy = BM_FACE_FIRST_LOOP(f_copy);
do {
BM_elem_attrs_copy(bm_src, bm_dst, l_iter, l_copy);
l_copy = l_copy->next;
} while ((l_iter = l_iter->next) != l_first);
return f_copy;
}
/**
* only create the face, since this calloc's the length is initialized to 0,
* leave adding loops to the caller.
*
* \note Caller needs to handle customdata.
*/
BLI_INLINE BMFace *bm_face_create__internal(BMesh *bm)
{
BMFace *f;
f = BLI_mempool_alloc(bm->fpool);
/* --- assign all members --- */
f->head.data = NULL;
#ifdef USE_DEBUG_INDEX_MEMCHECK
DEBUG_MEMCHECK_INDEX_INVALIDATE(f);
#else
BM_elem_index_set(f, -1); /* set_ok_invalid */
#endif
f->head.htype = BM_FACE;
f->head.hflag = 0;
f->head.api_flag = 0;
/* allocate flags */
if (bm->use_toolflags) {
((BMFace_OFlag *)f)->oflags = bm->ftoolflagpool ? BLI_mempool_calloc(bm->ftoolflagpool) : NULL;
}
#ifdef USE_BMESH_HOLES
BLI_listbase_clear(&f->loops);
#else
f->l_first = NULL;
#endif
f->len = 0;
/* caller must initialize */
// zero_v3(f->no);
f->mat_nr = 0;
/* --- done --- */
/* may add to middle of the pool */
bm->elem_index_dirty |= BM_FACE;
bm->elem_table_dirty |= BM_FACE;
bm->spacearr_dirty |= BM_SPACEARR_DIRTY_ALL;
bm->totface++;
#ifdef USE_BMESH_HOLES
f->totbounds = 0;
#endif
return f;
}
/**
* Main face creation function
*
* \param bm: The mesh
* \param verts: A sorted array of verts size of len
* \param edges: A sorted array of edges size of len
* \param len: Length of the face
* \param create_flag: Options for creating the face
*/
BMFace *BM_face_create(BMesh *bm,
BMVert **verts,
BMEdge **edges,
const int len,
const BMFace *f_example,
const eBMCreateFlag create_flag)
{
BMFace *f = NULL;
BMLoop *l, *startl, *lastl;
int i;
BLI_assert((f_example == NULL) || (f_example->head.htype == BM_FACE));
BLI_assert(!(create_flag & 1));
if (len == 0) {
/* just return NULL for now */
return NULL;
}
if (create_flag & BM_CREATE_NO_DOUBLE) {
/* Check if face already exists */
f = BM_face_exists(verts, len);
if (f != NULL) {
return f;
}
}
f = bm_face_create__internal(bm);
startl = lastl = bm_face_boundary_add(bm, f, verts[0], edges[0], create_flag);
for (i = 1; i < len; i++) {
l = bm_loop_create(bm, verts[i], edges[i], f, NULL /* edges[i]->l */, create_flag);
bmesh_radial_loop_append(edges[i], l);
l->prev = lastl;
lastl->next = l;
lastl = l;
}
startl->prev = lastl;
lastl->next = startl;
f->len = len;
if (!(create_flag & BM_CREATE_SKIP_CD)) {
if (f_example) {
BM_elem_attrs_copy(bm, bm, f_example, f);
}
else {
CustomData_bmesh_set_default(&bm->pdata, &f->head.data);
zero_v3(f->no);
}
}
else {
if (f_example) {
copy_v3_v3(f->no, f_example->no);
}
else {
zero_v3(f->no);
}
}
BM_CHECK_ELEMENT(f);
return f;
}
/**
* Wrapper for #BM_face_create when you don't have an edge array
*/
BMFace *BM_face_create_verts(BMesh *bm,
BMVert **vert_arr,
const int len,
const BMFace *f_example,
const eBMCreateFlag create_flag,
const bool create_edges)
{
BMEdge **edge_arr = BLI_array_alloca(edge_arr, len);
if (create_edges) {
BM_edges_from_verts_ensure(bm, edge_arr, vert_arr, len);
}
else {
if (BM_edges_from_verts(edge_arr, vert_arr, len) == false) {
return NULL;
}
}
return BM_face_create(bm, vert_arr, edge_arr, len, f_example, create_flag);
}
#ifndef NDEBUG
/**
* Check the element is valid.
*
* BMESH_TODO, when this raises an error the output is incredibly confusing.
* need to have some nice way to print/debug what the heck's going on.
*/
int bmesh_elem_check(void *element, const char htype)
{
BMHeader *head = element;
enum {
IS_NULL = (1 << 0),
IS_WRONG_TYPE = (1 << 1),
IS_VERT_WRONG_EDGE_TYPE = (1 << 2),
IS_EDGE_NULL_DISK_LINK = (1 << 3),
IS_EDGE_WRONG_LOOP_TYPE = (1 << 4),
IS_EDGE_WRONG_FACE_TYPE = (1 << 5),
IS_EDGE_NULL_RADIAL_LINK = (1 << 6),
IS_EDGE_ZERO_FACE_LENGTH = (1 << 7),
IS_LOOP_WRONG_FACE_TYPE = (1 << 8),
IS_LOOP_WRONG_EDGE_TYPE = (1 << 9),
IS_LOOP_WRONG_VERT_TYPE = (1 << 10),
IS_LOOP_VERT_NOT_IN_EDGE = (1 << 11),
IS_LOOP_NULL_CYCLE_LINK = (1 << 12),
IS_LOOP_ZERO_FACE_LENGTH = (1 << 13),
IS_LOOP_WRONG_FACE_LENGTH = (1 << 14),
IS_LOOP_WRONG_RADIAL_LENGTH = (1 << 15),
IS_FACE_NULL_LOOP = (1 << 16),
IS_FACE_WRONG_LOOP_FACE = (1 << 17),
IS_FACE_NULL_EDGE = (1 << 18),
IS_FACE_NULL_VERT = (1 << 19),
IS_FACE_LOOP_VERT_NOT_IN_EDGE = (1 << 20),
IS_FACE_LOOP_WRONG_RADIAL_LENGTH = (1 << 21),
IS_FACE_LOOP_WRONG_DISK_LENGTH = (1 << 22),
IS_FACE_LOOP_DUPE_LOOP = (1 << 23),
IS_FACE_LOOP_DUPE_VERT = (1 << 24),
IS_FACE_LOOP_DUPE_EDGE = (1 << 25),
IS_FACE_WRONG_LENGTH = (1 << 26),
} err = 0;
if (!element) {
return IS_NULL;
}
if (head->htype != htype) {
return IS_WRONG_TYPE;
}
switch (htype) {
case BM_VERT: {
BMVert *v = element;
if (v->e && v->e->head.htype != BM_EDGE) {
err |= IS_VERT_WRONG_EDGE_TYPE;
}
break;
}
case BM_EDGE: {
BMEdge *e = element;
if (e->v1_disk_link.prev == NULL || e->v2_disk_link.prev == NULL ||
e->v1_disk_link.next == NULL || e->v2_disk_link.next == NULL) {
err |= IS_EDGE_NULL_DISK_LINK;
}
if (e->l && e->l->head.htype != BM_LOOP) {
err |= IS_EDGE_WRONG_LOOP_TYPE;
}
if (e->l && e->l->f->head.htype != BM_FACE) {
err |= IS_EDGE_WRONG_FACE_TYPE;
}
if (e->l && (e->l->radial_next == NULL || e->l->radial_prev == NULL)) {
err |= IS_EDGE_NULL_RADIAL_LINK;
}
if (e->l && e->l->f->len <= 0) {
err |= IS_EDGE_ZERO_FACE_LENGTH;
}
break;
}
case BM_LOOP: {
BMLoop *l = element, *l2;
int i;
if (l->f->head.htype != BM_FACE) {
err |= IS_LOOP_WRONG_FACE_TYPE;
}
if (l->e->head.htype != BM_EDGE) {
err |= IS_LOOP_WRONG_EDGE_TYPE;
}
if (l->v->head.htype != BM_VERT) {
err |= IS_LOOP_WRONG_VERT_TYPE;
}
if (!BM_vert_in_edge(l->e, l->v)) {
fprintf(stderr,
"%s: fatal bmesh error (vert not in edge)! (bmesh internal error)\n",
__func__);
err |= IS_LOOP_VERT_NOT_IN_EDGE;
}
if (l->radial_next == NULL || l->radial_prev == NULL) {
err |= IS_LOOP_NULL_CYCLE_LINK;
}
if (l->f->len <= 0) {
err |= IS_LOOP_ZERO_FACE_LENGTH;
}
/* validate boundary loop -- invalid for hole loops, of course,
* but we won't be allowing those for a while yet */
l2 = l;
i = 0;
do {
if (i >= BM_NGON_MAX) {
break;
}
i++;
} while ((l2 = l2->next) != l);
if (i != l->f->len || l2 != l) {
err |= IS_LOOP_WRONG_FACE_LENGTH;
}
if (!bmesh_radial_validate(bmesh_radial_length(l), l)) {
err |= IS_LOOP_WRONG_RADIAL_LENGTH;
}
break;
}
case BM_FACE: {
BMFace *f = element;
BMLoop *l_iter;
BMLoop *l_first;
int len = 0;
# ifdef USE_BMESH_HOLES
if (!f->loops.first)
# else
if (!f->l_first)
# endif
{
err |= IS_FACE_NULL_LOOP;
}
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
if (l_iter->f != f) {
fprintf(stderr,
"%s: loop inside one face points to another! (bmesh internal error)\n",
__func__);
err |= IS_FACE_WRONG_LOOP_FACE;
}
if (!l_iter->e) {
err |= IS_FACE_NULL_EDGE;
}
if (!l_iter->v) {
err |= IS_FACE_NULL_VERT;
}
if (l_iter->e && l_iter->v) {
if (!BM_vert_in_edge(l_iter->e, l_iter->v) ||
!BM_vert_in_edge(l_iter->e, l_iter->next->v)) {
err |= IS_FACE_LOOP_VERT_NOT_IN_EDGE;
}
if (!bmesh_radial_validate(bmesh_radial_length(l_iter), l_iter)) {
err |= IS_FACE_LOOP_WRONG_RADIAL_LENGTH;
}
if (bmesh_disk_count_at_most(l_iter->v, 2) < 2) {
err |= IS_FACE_LOOP_WRONG_DISK_LENGTH;
}
}
/* check for duplicates */
if (BM_ELEM_API_FLAG_TEST(l_iter, _FLAG_ELEM_CHECK)) {
err |= IS_FACE_LOOP_DUPE_LOOP;
}
BM_ELEM_API_FLAG_ENABLE(l_iter, _FLAG_ELEM_CHECK);
if (l_iter->v) {
if (BM_ELEM_API_FLAG_TEST(l_iter->v, _FLAG_ELEM_CHECK)) {
err |= IS_FACE_LOOP_DUPE_VERT;
}
BM_ELEM_API_FLAG_ENABLE(l_iter->v, _FLAG_ELEM_CHECK);
}
if (l_iter->e) {
if (BM_ELEM_API_FLAG_TEST(l_iter->e, _FLAG_ELEM_CHECK)) {
err |= IS_FACE_LOOP_DUPE_EDGE;
}
BM_ELEM_API_FLAG_ENABLE(l_iter->e, _FLAG_ELEM_CHECK);
}
len++;
} while ((l_iter = l_iter->next) != l_first);
/* cleanup duplicates flag */
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
BM_ELEM_API_FLAG_DISABLE(l_iter, _FLAG_ELEM_CHECK);
if (l_iter->v) {
BM_ELEM_API_FLAG_DISABLE(l_iter->v, _FLAG_ELEM_CHECK);
}
if (l_iter->e) {
BM_ELEM_API_FLAG_DISABLE(l_iter->e, _FLAG_ELEM_CHECK);
}
} while ((l_iter = l_iter->next) != l_first);
if (len != f->len) {
err |= IS_FACE_WRONG_LENGTH;
}
break;
}
default:
BLI_assert(0);
break;
}
BMESH_ASSERT(err == 0);
return err;
}
#endif /* NDEBUG */
/**
* low level function, only frees the vert,
* doesn't change or adjust surrounding geometry
*/
static void bm_kill_only_vert(BMesh *bm, BMVert *v)
{
bm->totvert--;
bm->elem_index_dirty |= BM_VERT;
bm->elem_table_dirty |= BM_VERT;
bm->spacearr_dirty |= BM_SPACEARR_DIRTY_ALL;
BM_select_history_remove(bm, v);
if (v->head.data) {
CustomData_bmesh_free_block(&bm->vdata, &v->head.data);
}
if (bm->vtoolflagpool) {
BLI_mempool_free(bm->vtoolflagpool, ((BMVert_OFlag *)v)->oflags);
}
BLI_mempool_free(bm->vpool, v);
}
/**
* low level function, only frees the edge,
* doesn't change or adjust surrounding geometry
*/
static void bm_kill_only_edge(BMesh *bm, BMEdge *e)
{
bm->totedge--;
bm->elem_index_dirty |= BM_EDGE;
bm->elem_table_dirty |= BM_EDGE;
bm->spacearr_dirty |= BM_SPACEARR_DIRTY_ALL;
BM_select_history_remove(bm, (BMElem *)e);
if (e->head.data) {
CustomData_bmesh_free_block(&bm->edata, &e->head.data);
}
if (bm->etoolflagpool) {
BLI_mempool_free(bm->etoolflagpool, ((BMEdge_OFlag *)e)->oflags);
}
BLI_mempool_free(bm->epool, e);
}
/**
* low level function, only frees the face,
* doesn't change or adjust surrounding geometry
*/
static void bm_kill_only_face(BMesh *bm, BMFace *f)
{
if (bm->act_face == f) {
bm->act_face = NULL;
}
bm->totface--;
bm->elem_index_dirty |= BM_FACE;
bm->elem_table_dirty |= BM_FACE;
bm->spacearr_dirty |= BM_SPACEARR_DIRTY_ALL;
BM_select_history_remove(bm, (BMElem *)f);
if (f->head.data) {
CustomData_bmesh_free_block(&bm->pdata, &f->head.data);
}
if (bm->ftoolflagpool) {
BLI_mempool_free(bm->ftoolflagpool, ((BMFace_OFlag *)f)->oflags);
}
BLI_mempool_free(bm->fpool, f);
}
/**
* low level function, only frees the loop,
* doesn't change or adjust surrounding geometry
*/
static void bm_kill_only_loop(BMesh *bm, BMLoop *l)
{
bm->totloop--;
bm->elem_index_dirty |= BM_LOOP;
bm->spacearr_dirty |= BM_SPACEARR_DIRTY_ALL;
if (l->head.data) {
CustomData_bmesh_free_block(&bm->ldata, &l->head.data);
}
BLI_mempool_free(bm->lpool, l);
}
/**
* kills all edges associated with \a f, along with any other faces containing
* those edges
*/
void BM_face_edges_kill(BMesh *bm, BMFace *f)
{
BMEdge **edges = BLI_array_alloca(edges, f->len);
BMLoop *l_iter;
BMLoop *l_first;
int i = 0;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
edges[i++] = l_iter->e;
} while ((l_iter = l_iter->next) != l_first);
for (i = 0; i < f->len; i++) {
BM_edge_kill(bm, edges[i]);
}
}
/**
* kills all verts associated with \a f, along with any other faces containing
* those vertices
*/
void BM_face_verts_kill(BMesh *bm, BMFace *f)
{
BMVert **verts = BLI_array_alloca(verts, f->len);
BMLoop *l_iter;
BMLoop *l_first;
int i = 0;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
verts[i++] = l_iter->v;
} while ((l_iter = l_iter->next) != l_first);
for (i = 0; i < f->len; i++) {
BM_vert_kill(bm, verts[i]);
}
}
/**
* Kills \a f and its loops.
*/
void BM_face_kill(BMesh *bm, BMFace *f)
{
#ifdef USE_BMESH_HOLES
BMLoopList *ls, *ls_next;
#endif
#ifdef NDEBUG
/* check length since we may be removing degenerate faces */
if (f->len >= 3) {
BM_CHECK_ELEMENT(f);
}
#endif
#ifdef USE_BMESH_HOLES
for (ls = f->loops.first; ls; ls = ls_next)
#else
if (f->l_first)
#endif
{
BMLoop *l_iter, *l_next, *l_first;
#ifdef USE_BMESH_HOLES
ls_next = ls->next;
l_iter = l_first = ls->first;
#else
l_iter = l_first = f->l_first;
#endif
do {
l_next = l_iter->next;
bmesh_radial_loop_remove(l_iter->e, l_iter);
bm_kill_only_loop(bm, l_iter);
} while ((l_iter = l_next) != l_first);
#ifdef USE_BMESH_HOLES
BLI_mempool_free(bm->looplistpool, ls);
#endif
}
bm_kill_only_face(bm, f);
}
/**
* A version of #BM_face_kill which removes edges and verts
* which have no remaining connected geometry.
*/
void BM_face_kill_loose(BMesh *bm, BMFace *f)
{
#ifdef USE_BMESH_HOLES
BMLoopList *ls, *ls_next;
#endif
BM_CHECK_ELEMENT(f);
#ifdef USE_BMESH_HOLES
for (ls = f->loops.first; ls; ls = ls_next)
#else
if (f->l_first)
#endif
{
BMLoop *l_iter, *l_next, *l_first;
#ifdef USE_BMESH_HOLES
ls_next = ls->next;
l_iter = l_first = ls->first;
#else
l_iter = l_first = f->l_first;
#endif
do {
BMEdge *e;
l_next = l_iter->next;
e = l_iter->e;
bmesh_radial_loop_remove(e, l_iter);
bm_kill_only_loop(bm, l_iter);
if (e->l == NULL) {
BMVert *v1 = e->v1, *v2 = e->v2;
bmesh_disk_edge_remove(e, e->v1);
bmesh_disk_edge_remove(e, e->v2);
bm_kill_only_edge(bm, e);
if (v1->e == NULL) {
bm_kill_only_vert(bm, v1);
}
if (v2->e == NULL) {
bm_kill_only_vert(bm, v2);
}
}
} while ((l_iter = l_next) != l_first);
#ifdef USE_BMESH_HOLES
BLI_mempool_free(bm->looplistpool, ls);
#endif
}
bm_kill_only_face(bm, f);
}
/**
* kills \a e and all faces that use it.
*/
void BM_edge_kill(BMesh *bm, BMEdge *e)
{
while (e->l) {
BM_face_kill(bm, e->l->f);
}
bmesh_disk_edge_remove(e, e->v1);
bmesh_disk_edge_remove(e, e->v2);
bm_kill_only_edge(bm, e);
}
/**
* kills \a v and all edges that use it.
*/
void BM_vert_kill(BMesh *bm, BMVert *v)
{
while (v->e) {
BM_edge_kill(bm, v->e);
}
bm_kill_only_vert(bm, v);
}
/********** private disk and radial cycle functions ********** */
/**
* return the length of the face, should always equal \a l->f->len
*/
static int UNUSED_FUNCTION(bm_loop_length)(BMLoop *l)
{
BMLoop *l_first = l;
int i = 0;
do {
i++;
} while ((l = l->next) != l_first);
return i;
}
/**
* \brief Loop Reverse
*
* Changes the winding order of a face from CW to CCW or vice versa.
*
* \param cd_loop_mdisp_offset: Cached result of `CustomData_get_offset(&bm->ldata, CD_MDISPS)`.
* \param use_loop_mdisp_flip: When set, flip the Z-depth of the mdisp,
* (use when flipping normals, disable when mirroring, eg: symmetrize).
*/
void bmesh_kernel_loop_reverse(BMesh *bm,
BMFace *f,
const int cd_loop_mdisp_offset,
const bool use_loop_mdisp_flip)
{
BMLoop *l_first = f->l_first;
/* track previous cycles radial state */
BMEdge *e_prev = l_first->prev->e;
BMLoop *l_prev_radial_next = l_first->prev->radial_next;
BMLoop *l_prev_radial_prev = l_first->prev->radial_prev;
bool is_prev_boundary = l_prev_radial_next == l_prev_radial_next->radial_next;
BMLoop *l_iter = l_first;
do {
BMEdge *e_iter = l_iter->e;
BMLoop *l_iter_radial_next = l_iter->radial_next;
BMLoop *l_iter_radial_prev = l_iter->radial_prev;
bool is_iter_boundary = l_iter_radial_next == l_iter_radial_next->radial_next;
#if 0
bmesh_radial_loop_remove(e_iter, l_iter);
bmesh_radial_loop_append(e_prev, l_iter);
#else
/* inline loop reversal */
if (is_prev_boundary) {
/* boundary */
l_iter->radial_next = l_iter;
l_iter->radial_prev = l_iter;
}
else {
/* non-boundary, replace radial links */
l_iter->radial_next = l_prev_radial_next;
l_iter->radial_prev = l_prev_radial_prev;
l_prev_radial_next->radial_prev = l_iter;
l_prev_radial_prev->radial_next = l_iter;
}
if (e_iter->l == l_iter) {
e_iter->l = l_iter->next;
}
l_iter->e = e_prev;
#endif
SWAP(BMLoop *, l_iter->next, l_iter->prev);
if (cd_loop_mdisp_offset != -1) {
MDisps *md = BM_ELEM_CD_GET_VOID_P(l_iter, cd_loop_mdisp_offset);
BKE_mesh_mdisp_flip(md, use_loop_mdisp_flip);
}
e_prev = e_iter;
l_prev_radial_next = l_iter_radial_next;
l_prev_radial_prev = l_iter_radial_prev;
is_prev_boundary = is_iter_boundary;
/* step to next (now swapped) */
} while ((l_iter = l_iter->prev) != l_first);
#ifndef NDEBUG
/* validate radial */
int i;
for (i = 0, l_iter = l_first; i < f->len; i++, l_iter = l_iter->next) {
BM_CHECK_ELEMENT(l_iter);
BM_CHECK_ELEMENT(l_iter->e);
BM_CHECK_ELEMENT(l_iter->v);
BM_CHECK_ELEMENT(l_iter->f);
}
BM_CHECK_ELEMENT(f);
#endif
/* Loop indices are no more valid! */
bm->elem_index_dirty |= BM_LOOP;
}
static void bm_elements_systag_enable(void *veles, int tot, const char api_flag)
{
BMHeader **eles = veles;
int i;
for (i = 0; i < tot; i++) {
BM_ELEM_API_FLAG_ENABLE((BMElemF *)eles[i], api_flag);
}
}
static void bm_elements_systag_disable(void *veles, int tot, const char api_flag)
{
BMHeader **eles = veles;
int i;
for (i = 0; i < tot; i++) {
BM_ELEM_API_FLAG_DISABLE((BMElemF *)eles[i], api_flag);
}
}
static int bm_loop_systag_count_radial(BMLoop *l, const char api_flag)
{
BMLoop *l_iter = l;
int i = 0;
do {
i += BM_ELEM_API_FLAG_TEST(l_iter->f, api_flag) ? 1 : 0;
} while ((l_iter = l_iter->radial_next) != l);
return i;
}
static int UNUSED_FUNCTION(bm_vert_systag_count_disk)(BMVert *v, const char api_flag)
{
BMEdge *e = v->e;
int i = 0;
if (!e) {
return 0;
}
do {
i += BM_ELEM_API_FLAG_TEST(e, api_flag) ? 1 : 0;
} while ((e = bmesh_disk_edge_next(e, v)) != v->e);
return i;
}
/**
* Return true when the vertex is manifold,
* attached to faces which are all flagged.
*/
static bool bm_vert_is_manifold_flagged(BMVert *v, const char api_flag)
{
BMEdge *e = v->e;
if (!e) {
return false;
}
do {
BMLoop *l = e->l;
if (!l) {
return false;
}
if (BM_edge_is_boundary(l->e)) {
return false;
}
do {
if (!BM_ELEM_API_FLAG_TEST(l->f, api_flag)) {
return false;
}
} while ((l = l->radial_next) != e->l);
} while ((e = bmesh_disk_edge_next(e, v)) != v->e);
return true;
}
/* Mid-level Topology Manipulation Functions */
/**
* \brief Join Connected Faces
*
* Joins a collected group of faces into one. Only restriction on
* the input data is that the faces must be connected to each other.
*
* \return The newly created combine BMFace.
*
* \note If a pair of faces share multiple edges,
* the pair of faces will be joined at every edge.
*
* \note this is a generic, flexible join faces function,
* almost everything uses this, including #BM_faces_join_pair
*/
BMFace *BM_faces_join(BMesh *bm, BMFace **faces, int totface, const bool do_del)
{
BMFace *f, *f_new;
#ifdef USE_BMESH_HOLES
BMLoopList *lst;
ListBase holes = {NULL, NULL};
#endif
BMLoop *l_iter;
BMLoop *l_first;
BMEdge **edges = NULL;
BMEdge **deledges = NULL;
BMVert **delverts = NULL;
BLI_array_staticdeclare(edges, BM_DEFAULT_NGON_STACK_SIZE);
BLI_array_staticdeclare(deledges, BM_DEFAULT_NGON_STACK_SIZE);
BLI_array_staticdeclare(delverts, BM_DEFAULT_NGON_STACK_SIZE);
BMVert *v1 = NULL, *v2 = NULL;
int i;
const int cd_loop_mdisp_offset = CustomData_get_offset(&bm->ldata, CD_MDISPS);
if (UNLIKELY(!totface)) {
BMESH_ASSERT(0);
return NULL;
}
if (totface == 1) {
return faces[0];
}
bm_elements_systag_enable(faces, totface, _FLAG_JF);
for (i = 0; i < totface; i++) {
f = faces[i];
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
int rlen = bm_loop_systag_count_radial(l_iter, _FLAG_JF);
if (rlen > 2) {
/* Input faces do not form a contiguous manifold region */
goto error;
}
else if (rlen == 1) {
BLI_array_append(edges, l_iter->e);
if (!v1) {
v1 = l_iter->v;
v2 = BM_edge_other_vert(l_iter->e, l_iter->v);
}
}
else if (rlen == 2) {
const bool d1 = bm_vert_is_manifold_flagged(l_iter->e->v1, _FLAG_JF);
const bool d2 = bm_vert_is_manifold_flagged(l_iter->e->v2, _FLAG_JF);
if (!d1 && !d2 && !BM_ELEM_API_FLAG_TEST(l_iter->e, _FLAG_JF)) {
/* don't remove an edge it makes up the side of another face
* else this will remove the face as well - campbell */
if (!BM_edge_face_count_is_over(l_iter->e, 2)) {
if (do_del) {
BLI_array_append(deledges, l_iter->e);
}
BM_ELEM_API_FLAG_ENABLE(l_iter->e, _FLAG_JF);
}
}
else {
if (d1 && !BM_ELEM_API_FLAG_TEST(l_iter->e->v1, _FLAG_JF)) {
if (do_del) {
BLI_array_append(delverts, l_iter->e->v1);
}
BM_ELEM_API_FLAG_ENABLE(l_iter->e->v1, _FLAG_JF);
}
if (d2 && !BM_ELEM_API_FLAG_TEST(l_iter->e->v2, _FLAG_JF)) {
if (do_del) {
BLI_array_append(delverts, l_iter->e->v2);
}
BM_ELEM_API_FLAG_ENABLE(l_iter->e->v2, _FLAG_JF);
}
}
}
} while ((l_iter = l_iter->next) != l_first);
#ifdef USE_BMESH_HOLES
for (lst = f->loops.first; lst; lst = lst->next) {
if (lst == f->loops.first) {
continue;
}
BLI_remlink(&f->loops, lst);
BLI_addtail(&holes, lst);
}
#endif
}
/* create region face */
f_new = BLI_array_len(edges) ?
BM_face_create_ngon(
bm, v1, v2, edges, BLI_array_len(edges), faces[0], BM_CREATE_NOP) :
NULL;
if (UNLIKELY(f_new == NULL)) {
/* Invalid boundary region to join faces */
goto error;
}
/* copy over loop data */
l_iter = l_first = BM_FACE_FIRST_LOOP(f_new);
do {
BMLoop *l2 = l_iter->radial_next;
do {
if (BM_ELEM_API_FLAG_TEST(l2->f, _FLAG_JF)) {
break;
}
l2 = l2->radial_next;
} while (l2 != l_iter);
if (l2 != l_iter) {
/* loops share an edge, shared vert depends on winding */
if (l2->v != l_iter->v) {
l2 = l2->next;
}
BLI_assert(l_iter->v == l2->v);
BM_elem_attrs_copy(bm, bm, l2, l_iter);
}
} while ((l_iter = l_iter->next) != l_first);
#ifdef USE_BMESH_HOLES
/* add holes */
BLI_movelisttolist(&f_new->loops, &holes);
/* update loop face pointer */
for (lst = f_new->loops.first; lst; lst = lst->next) {
l_iter = l_first = lst->first;
do {
l_iter->f = f_new;
} while ((l_iter = l_iter->next) != l_first);
}
#endif
bm_elements_systag_disable(faces, totface, _FLAG_JF);
BM_ELEM_API_FLAG_DISABLE(f_new, _FLAG_JF);
/* handle multi-res data */
if (cd_loop_mdisp_offset != -1) {
float f_center[3];
float(*faces_center)[3] = BLI_array_alloca(faces_center, totface);
BM_face_calc_center_median(f_new, f_center);
for (i = 0; i < totface; i++) {
BM_face_calc_center_median(faces[i], faces_center[i]);
}
l_iter = l_first = BM_FACE_FIRST_LOOP(f_new);
do {
for (i = 0; i < totface; i++) {
BM_loop_interp_multires_ex(
bm, l_iter, faces[i], f_center, faces_center[i], cd_loop_mdisp_offset);
}
} while ((l_iter = l_iter->next) != l_first);
}
/* delete old geometry */
if (do_del) {
for (i = 0; i < BLI_array_len(deledges); i++) {
BM_edge_kill(bm, deledges[i]);
}
for (i = 0; i < BLI_array_len(delverts); i++) {
BM_vert_kill(bm, delverts[i]);
}
}
else {
/* otherwise we get both old and new faces */
for (i = 0; i < totface; i++) {
BM_face_kill(bm, faces[i]);
}
}
BLI_array_free(edges);
BLI_array_free(deledges);
BLI_array_free(delverts);
BM_CHECK_ELEMENT(f_new);
return f_new;
error:
bm_elements_systag_disable(faces, totface, _FLAG_JF);
BLI_array_free(edges);
BLI_array_free(deledges);
BLI_array_free(delverts);
return NULL;
}
static BMFace *bm_face_create__sfme(BMesh *bm, BMFace *f_example)
{
BMFace *f;
#ifdef USE_BMESH_HOLES
BMLoopList *lst;
#endif
f = bm_face_create__internal(bm);
#ifdef USE_BMESH_HOLES
lst = BLI_mempool_calloc(bm->looplistpool);
BLI_addtail(&f->loops, lst);
#endif
#ifdef USE_BMESH_HOLES
f->totbounds = 1;
#endif
BM_elem_attrs_copy(bm, bm, f_example, f);
return f;
}
/**
* \brief Split Face Make Edge (SFME)
*
* \warning this is a low level function, most likely you want to use #BM_face_split()
*
* Takes as input two vertices in a single face.
* An edge is created which divides the original face into two distinct regions.
* One of the regions is assigned to the original face and it is closed off.
* The second region has a new face assigned to it.
*
* \par Examples:
* <pre>
* Before: After:
* +--------+ +--------+
* | | | |
* | | | f1 |
* v1 f1 v2 v1======v2
* | | | f2 |
* | | | |
* +--------+ +--------+
* </pre>
*
* \note the input vertices can be part of the same edge. This will
* result in a two edged face. This is desirable for advanced construction
* tools and particularly essential for edge bevel. Because of this it is
* up to the caller to decide what to do with the extra edge.
*
* \note If \a holes is NULL, then both faces will lose
* all holes from the original face. Also, you cannot split between
* a hole vert and a boundary vert; that case is handled by higher-
* level wrapping functions (when holes are fully implemented, anyway).
*
* \note that holes represents which holes goes to the new face, and of
* course this requires removing them from the existing face first, since
* you cannot have linked list links inside multiple lists.
*
* \return A BMFace pointer
*/
BMFace *bmesh_kernel_split_face_make_edge(BMesh *bm,
BMFace *f,
BMLoop *l_v1,
BMLoop *l_v2,
BMLoop **r_l,
#ifdef USE_BMESH_HOLES
ListBase *holes,
#endif
BMEdge *e_example,
const bool no_double)
{
#ifdef USE_BMESH_HOLES
BMLoopList *lst, *lst2;
#else
int first_loop_f1;
#endif
BMFace *f2;
BMLoop *l_iter, *l_first;
BMLoop *l_f1 = NULL, *l_f2 = NULL;
BMEdge *e;
BMVert *v1 = l_v1->v, *v2 = l_v2->v;
int f1len, f2len;
BLI_assert(f == l_v1->f && f == l_v2->f);
/* allocate new edge between v1 and v2 */
e = BM_edge_create(bm, v1, v2, e_example, no_double ? BM_CREATE_NO_DOUBLE : BM_CREATE_NOP);
f2 = bm_face_create__sfme(bm, f);
l_f1 = bm_loop_create(bm, v2, e, f, l_v2, 0);
l_f2 = bm_loop_create(bm, v1, e, f2, l_v1, 0);
l_f1->prev = l_v2->prev;
l_f2->prev = l_v1->prev;
l_v2->prev->next = l_f1;
l_v1->prev->next = l_f2;
l_f1->next = l_v1;
l_f2->next = l_v2;
l_v1->prev = l_f1;
l_v2->prev = l_f2;
#ifdef USE_BMESH_HOLES
lst = f->loops.first;
lst2 = f2->loops.first;
lst2->first = lst2->last = l_f2;
lst->first = lst->last = l_f1;
#else
/* find which of the faces the original first loop is in */
l_iter = l_first = l_f1;
first_loop_f1 = 0;
do {
if (l_iter == f->l_first) {
first_loop_f1 = 1;
}
} while ((l_iter = l_iter->next) != l_first);
if (first_loop_f1) {
/* original first loop was in f1, find a suitable first loop for f2
* which is as similar as possible to f1. the order matters for tools
* such as duplifaces. */
if (f->l_first->prev == l_f1) {
f2->l_first = l_f2->prev;
}
else if (f->l_first->next == l_f1) {
f2->l_first = l_f2->next;
}
else {
f2->l_first = l_f2;
}
}
else {
/* original first loop was in f2, further do same as above */
f2->l_first = f->l_first;
if (f->l_first->prev == l_f2) {
f->l_first = l_f1->prev;
}
else if (f->l_first->next == l_f2) {
f->l_first = l_f1->next;
}
else {
f->l_first = l_f1;
}
}
#endif
/* validate both loop */
/* I don't know how many loops are supposed to be in each face at this point! FIXME */
/* go through all of f2's loops and make sure they point to it properly */
l_iter = l_first = BM_FACE_FIRST_LOOP(f2);
f2len = 0;
do {
l_iter->f = f2;
f2len++;
} while ((l_iter = l_iter->next) != l_first);
/* link up the new loops into the new edges radial */
bmesh_radial_loop_append(e, l_f1);
bmesh_radial_loop_append(e, l_f2);
f2->len = f2len;
f1len = 0;
l_iter = l_first = BM_FACE_FIRST_LOOP(f);
do {
f1len++;
} while ((l_iter = l_iter->next) != l_first);
f->len = f1len;
if (r_l) {
*r_l = l_f2;
}
#ifdef USE_BMESH_HOLES
if (holes) {
BLI_movelisttolist(&f2->loops, holes);
}
else {
/* this code is not significant until holes actually work */
// printf("warning: call to split face euler without holes argument; holes will be tossed.\n");
for (lst = f->loops.last; lst != f->loops.first; lst = lst2) {
lst2 = lst->prev;
BLI_mempool_free(bm->looplistpool, lst);
}
}
#endif
BM_CHECK_ELEMENT(e);
BM_CHECK_ELEMENT(f);
BM_CHECK_ELEMENT(f2);
return f2;
}
/**
* \brief Split Edge Make Vert (SEMV)
*
* Takes \a e edge and splits it into two, creating a new vert.
* \a tv should be one end of \a e : the newly created edge
* will be attached to that end and is returned in \a r_e.
*
* \par Examples:
*
* <pre>
* E
* Before: OV-------------TV
* E RE
* After: OV------NV-----TV
* </pre>
*
* \return The newly created BMVert pointer.
*/
BMVert *bmesh_kernel_split_edge_make_vert(BMesh *bm, BMVert *tv, BMEdge *e, BMEdge **r_e)
{
BMLoop *l_next;
BMEdge *e_new;
BMVert *v_new, *v_old;
#ifndef NDEBUG
int valence1, valence2;
bool edok;
int i;
#endif
BLI_assert(BM_vert_in_edge(e, tv) != false);
v_old = BM_edge_other_vert(e, tv);
#ifndef NDEBUG
valence1 = bmesh_disk_count(v_old);
valence2 = bmesh_disk_count(tv);
#endif
/* order of 'e_new' verts should match 'e'
* (so extruded faces don't flip) */
v_new = BM_vert_create(bm, tv->co, tv, BM_CREATE_NOP);
e_new = BM_edge_create(bm, tv, v_new, e, BM_CREATE_NOP);
bmesh_disk_edge_remove(e_new, tv);
bmesh_disk_edge_remove(e_new, v_new);
bmesh_disk_vert_replace(e, v_new, tv);
/* add e_new to v_new's disk cycle */
bmesh_disk_edge_append(e_new, v_new);
/* add e_new to tv's disk cycle */
bmesh_disk_edge_append(e_new, tv);
#ifndef NDEBUG
/* verify disk cycles */
edok = bmesh_disk_validate(valence1, v_old->e, v_old);
BMESH_ASSERT(edok != false);
edok = bmesh_disk_validate(valence2, tv->e, tv);
BMESH_ASSERT(edok != false);
edok = bmesh_disk_validate(2, v_new->e, v_new);
BMESH_ASSERT(edok != false);
#endif
/* Split the radial cycle if present */
l_next = e->l;
e->l = NULL;
if (l_next) {
BMLoop *l_new, *l;
#ifndef NDEBUG
int radlen = bmesh_radial_length(l_next);
#endif
bool is_first = true;
/* Take the next loop. Remove it from radial. Split it. Append to appropriate radials */
while (l_next) {
l = l_next;
l->f->len++;
l_next = l_next != l_next->radial_next ? l_next->radial_next : NULL;
bmesh_radial_loop_unlink(l);
l_new = bm_loop_create(bm, NULL, NULL, l->f, l, 0);
l_new->prev = l;
l_new->next = l->next;
l_new->prev->next = l_new;
l_new->next->prev = l_new;
l_new->v = v_new;
/* assign the correct edge to the correct loop */
if (BM_verts_in_edge(l_new->v, l_new->next->v, e)) {
l_new->e = e;
l->e = e_new;
/* append l into e_new's rad cycle */
if (is_first) {
is_first = false;
l->radial_next = l->radial_prev = NULL;
}
bmesh_radial_loop_append(l_new->e, l_new);
bmesh_radial_loop_append(l->e, l);
}
else if (BM_verts_in_edge(l_new->v, l_new->next->v, e_new)) {
l_new->e = e_new;
l->e = e;
/* append l into e_new's rad cycle */
if (is_first) {
is_first = false;
l->radial_next = l->radial_prev = NULL;
}
bmesh_radial_loop_append(l_new->e, l_new);
bmesh_radial_loop_append(l->e, l);
}
}
#ifndef NDEBUG
/* verify length of radial cycle */
edok = bmesh_radial_validate(radlen, e->l);
BMESH_ASSERT(edok != false);
edok = bmesh_radial_validate(radlen, e_new->l);
BMESH_ASSERT(edok != false);
/* verify loop->v and loop->next->v pointers for e */
for (i = 0, l = e->l; i < radlen; i++, l = l->radial_next) {
BMESH_ASSERT(l->e == e);
// BMESH_ASSERT(l->radial_next == l);
BMESH_ASSERT(!(l->prev->e != e_new && l->next->e != e_new));
edok = BM_verts_in_edge(l->v, l->next->v, e);
BMESH_ASSERT(edok != false);
BMESH_ASSERT(l->v != l->next->v);
BMESH_ASSERT(l->e != l->next->e);
/* verify loop cycle for kloop->f */
BM_CHECK_ELEMENT(l);
BM_CHECK_ELEMENT(l->v);
BM_CHECK_ELEMENT(l->e);
BM_CHECK_ELEMENT(l->f);
}
/* verify loop->v and loop->next->v pointers for e_new */
for (i = 0, l = e_new->l; i < radlen; i++, l = l->radial_next) {
BMESH_ASSERT(l->e == e_new);
// BMESH_ASSERT(l->radial_next == l);
BMESH_ASSERT(!(l->prev->e != e && l->next->e != e));
edok = BM_verts_in_edge(l->v, l->next->v, e_new);
BMESH_ASSERT(edok != false);
BMESH_ASSERT(l->v != l->next->v);
BMESH_ASSERT(l->e != l->next->e);
BM_CHECK_ELEMENT(l);
BM_CHECK_ELEMENT(l->v);
BM_CHECK_ELEMENT(l->e);
BM_CHECK_ELEMENT(l->f);
}
#endif
}
BM_CHECK_ELEMENT(e_new);
BM_CHECK_ELEMENT(v_new);
BM_CHECK_ELEMENT(v_old);
BM_CHECK_ELEMENT(e);
BM_CHECK_ELEMENT(tv);
if (r_e) {
*r_e = e_new;
}
return v_new;
}
/**
* \brief Join Edge Kill Vert (JEKV)
*
* Takes an edge \a e_kill and pointer to one of its vertices \a v_kill
* and collapses the edge on that vertex.
*
* \par Examples:
*
* <pre>
* Before: e_old e_kill
* +-------+-------+
* | | |
* v_old v_kill v_target
*
* After: e_old
* +---------------+
* | |
* v_old v_target
* </pre>
*
* \par Restrictions:
* KV is a vertex that must have a valance of exactly two. Furthermore
* both edges in KV's disk cycle (OE and KE) must be unique (no double edges).
*
* \return The resulting edge, NULL for failure.
*
* \note This euler has the possibility of creating
* faces with just 2 edges. It is up to the caller to decide what to do with
* these faces.
*/
BMEdge *bmesh_kernel_join_edge_kill_vert(BMesh *bm,
BMEdge *e_kill,
BMVert *v_kill,
const bool do_del,
const bool check_edge_exists,
const bool kill_degenerate_faces)
{
BMEdge *e_old;
BMVert *v_old, *v_target;
BMLoop *l_kill;
#ifndef NDEBUG
int radlen, i;
bool edok;
#endif
BLI_assert(BM_vert_in_edge(e_kill, v_kill));
if (BM_vert_in_edge(e_kill, v_kill) == 0) {
return NULL;
}
if (bmesh_disk_count_at_most(v_kill, 3) == 2) {
#ifndef NDEBUG
int valence1, valence2;
BMLoop *l;
#endif
e_old = bmesh_disk_edge_next(e_kill, v_kill);
v_target = BM_edge_other_vert(e_kill, v_kill);
v_old = BM_edge_other_vert(e_old, v_kill);
/* check for double edges */
if (BM_verts_in_edge(v_kill, v_target, e_old)) {
return NULL;
}
BMEdge *e_splice;
BLI_SMALLSTACK_DECLARE(faces_degenerate, BMFace *);
BMLoop *l_kill_next;
#ifndef NDEBUG
/* For verification later, count valence of 'v_old' and 'v_target' */
valence1 = bmesh_disk_count(v_old);
valence2 = bmesh_disk_count(v_target);
#endif
if (check_edge_exists) {
e_splice = BM_edge_exists(v_target, v_old);
}
bmesh_disk_vert_replace(e_old, v_target, v_kill);
/* remove e_kill from 'v_target's disk cycle */
bmesh_disk_edge_remove(e_kill, v_target);
#ifndef NDEBUG
/* deal with radial cycle of e_kill */
radlen = bmesh_radial_length(e_kill->l);
#endif
if (e_kill->l) {
/* fix the neighboring loops of all loops in e_kill's radial cycle */
l_kill = e_kill->l;
do {
/* relink loops and fix vertex pointer */
if (l_kill->next->v == v_kill) {
l_kill->next->v = v_target;
}
l_kill->next->prev = l_kill->prev;
l_kill->prev->next = l_kill->next;
if (BM_FACE_FIRST_LOOP(l_kill->f) == l_kill) {
BM_FACE_FIRST_LOOP(l_kill->f) = l_kill->next;
}
/* fix len attribute of face */
l_kill->f->len--;
if (kill_degenerate_faces) {
if (l_kill->f->len < 3) {
BLI_SMALLSTACK_PUSH(faces_degenerate, l_kill->f);
}
}
l_kill_next = l_kill->radial_next;
bm_kill_only_loop(bm, l_kill);
} while ((l_kill = l_kill_next) != e_kill->l);
/* `e_kill->l` is invalid but the edge is freed next. */
#ifndef NDEBUG
/* Validate radial cycle of e_old */
edok = bmesh_radial_validate(radlen, e_old->l);
BMESH_ASSERT(edok != false);
#endif
}
/* deallocate edge */
bm_kill_only_edge(bm, e_kill);
/* deallocate vertex */
if (do_del) {
bm_kill_only_vert(bm, v_kill);
}
else {
v_kill->e = NULL;
}
#ifndef NDEBUG
/* Validate disk cycle lengths of 'v_old', 'v_target' are unchanged */
edok = bmesh_disk_validate(valence1, v_old->e, v_old);
BMESH_ASSERT(edok != false);
edok = bmesh_disk_validate(valence2, v_target->e, v_target);
BMESH_ASSERT(edok != false);
/* Validate loop cycle of all faces attached to 'e_old' */
for (i = 0, l = e_old->l; i < radlen; i++, l = l->radial_next) {
BMESH_ASSERT(l->e == e_old);
edok = BM_verts_in_edge(l->v, l->next->v, e_old);
BMESH_ASSERT(edok != false);
edok = bmesh_loop_validate(l->f);
BMESH_ASSERT(edok != false);
BM_CHECK_ELEMENT(l);
BM_CHECK_ELEMENT(l->v);
BM_CHECK_ELEMENT(l->e);
BM_CHECK_ELEMENT(l->f);
}
#endif
if (check_edge_exists) {
if (e_splice) {
/* removes e_splice */
BM_edge_splice(bm, e_old, e_splice);
}
}
if (kill_degenerate_faces) {
BMFace *f_kill;
while ((f_kill = BLI_SMALLSTACK_POP(faces_degenerate))) {
BM_face_kill(bm, f_kill);
}
}
BM_CHECK_ELEMENT(v_old);
BM_CHECK_ELEMENT(v_target);
BM_CHECK_ELEMENT(e_old);
return e_old;
}
return NULL;
}
/**
* \brief Join Vert Kill Edge (JVKE)
*
* Collapse an edge, merging surrounding data.
*
* Unlike #BM_vert_collapse_edge & #bmesh_kernel_join_edge_kill_vert
* which only handle 2 valence verts,
* this can handle any number of connected edges/faces.
*
* <pre>
* Before: -> After:
* +-+-+-+ +-+-+-+
* | | | | | \ / |
* +-+-+-+ +--+--+
* | | | | | / \ |
* +-+-+-+ +-+-+-+
* </pre>
*/
BMVert *bmesh_kernel_join_vert_kill_edge(BMesh *bm,
BMEdge *e_kill,
BMVert *v_kill,
const bool do_del,
const bool check_edge_exists,
const bool kill_degenerate_faces)
{
BLI_SMALLSTACK_DECLARE(faces_degenerate, BMFace *);
BMVert *v_target = BM_edge_other_vert(e_kill, v_kill);
BLI_assert(BM_vert_in_edge(e_kill, v_kill));
if (e_kill->l) {
BMLoop *l_kill, *l_first, *l_kill_next;
l_kill = l_first = e_kill->l;
do {
/* relink loops and fix vertex pointer */
if (l_kill->next->v == v_kill) {
l_kill->next->v = v_target;
}
l_kill->next->prev = l_kill->prev;
l_kill->prev->next = l_kill->next;
if (BM_FACE_FIRST_LOOP(l_kill->f) == l_kill) {
BM_FACE_FIRST_LOOP(l_kill->f) = l_kill->next;
}
/* fix len attribute of face */
l_kill->f->len--;
if (kill_degenerate_faces) {
if (l_kill->f->len < 3) {
BLI_SMALLSTACK_PUSH(faces_degenerate, l_kill->f);
}
}
l_kill_next = l_kill->radial_next;
bm_kill_only_loop(bm, l_kill);
} while ((l_kill = l_kill_next) != l_first);
e_kill->l = NULL;
}
BM_edge_kill(bm, e_kill);
BM_CHECK_ELEMENT(v_kill);
BM_CHECK_ELEMENT(v_target);
if (v_target->e && v_kill->e) {
/* inline BM_vert_splice(bm, v_target, v_kill); */
BMEdge *e;
while ((e = v_kill->e)) {
BMEdge *e_target;
if (check_edge_exists) {
e_target = BM_edge_exists(v_target, BM_edge_other_vert(e, v_kill));
}
bmesh_edge_vert_swap(e, v_target, v_kill);
BLI_assert(e->v1 != e->v2);
if (check_edge_exists) {
if (e_target) {
BM_edge_splice(bm, e_target, e);
}
}
}
}
if (kill_degenerate_faces) {
BMFace *f_kill;
while ((f_kill = BLI_SMALLSTACK_POP(faces_degenerate))) {
BM_face_kill(bm, f_kill);
}
}
if (do_del) {
BLI_assert(v_kill->e == NULL);
bm_kill_only_vert(bm, v_kill);
}
return v_target;
}
/**
* \brief Join Face Kill Edge (JFKE)
*
* Takes two faces joined by a single 2-manifold edge and fuses them together.
* The edge shared by the faces must not be connected to any other edges which have
* Both faces in its radial cycle
*
* \par Examples:
* <pre>
* A B
* +--------+ +--------+
* | | | |
* | f1 | | f1 |
* v1========v2 = Ok! v1==V2==v3 == Wrong!
* | f2 | | f2 |
* | | | |
* +--------+ +--------+
* </pre>
*
* In the example A, faces \a f1 and \a f2 are joined by a single edge,
* and the euler can safely be used.
* In example B however, \a f1 and \a f2 are joined by multiple edges and will produce an error.
* The caller in this case should call #bmesh_kernel_join_edge_kill_vert on the extra edges
* before attempting to fuse \a f1 and \a f2.
*
* \note The order of arguments decides whether or not certain per-face attributes are present
* in the resultant face. For instance vertex winding, material index, smooth flags,
* etc are inherited from \a f1, not \a f2.
*
* \return A BMFace pointer
*/
BMFace *bmesh_kernel_join_face_kill_edge(BMesh *bm, BMFace *f1, BMFace *f2, BMEdge *e)
{
BMLoop *l_iter, *l_f1 = NULL, *l_f2 = NULL;
int newlen = 0, i, f1len = 0, f2len = 0;
bool edok;
/* can't join a face to itself */
if (f1 == f2) {
return NULL;
}
/* validate that edge is 2-manifold edge */
if (!BM_edge_is_manifold(e)) {
return NULL;
}
/* verify that e is in both f1 and f2 */
f1len = f1->len;
f2len = f2->len;
if (!((l_f1 = BM_face_edge_share_loop(f1, e)) && (l_f2 = BM_face_edge_share_loop(f2, e)))) {
return NULL;
}
/* validate direction of f2's loop cycle is compatible */
if (l_f1->v == l_f2->v) {
return NULL;
}
/* validate that for each face, each vertex has another edge in its disk cycle that is
* not e, and not shared. */
if (BM_edge_in_face(l_f1->next->e, f2) || BM_edge_in_face(l_f1->prev->e, f2) ||
BM_edge_in_face(l_f2->next->e, f1) || BM_edge_in_face(l_f2->prev->e, f1)) {
return NULL;
}
/* validate only one shared edge */
if (BM_face_share_edge_count(f1, f2) > 1) {
return NULL;
}
/* validate no internal join */
{
bool is_dupe = false;
/* TODO: skip clearing once this is ensured. */
for (i = 0, l_iter = BM_FACE_FIRST_LOOP(f2); i < f2len; i++, l_iter = l_iter->next) {
BM_elem_flag_disable(l_iter->v, BM_ELEM_INTERNAL_TAG);
}
for (i = 0, l_iter = BM_FACE_FIRST_LOOP(f1); i < f1len; i++, l_iter = l_iter->next) {
BM_elem_flag_set(l_iter->v, BM_ELEM_INTERNAL_TAG, l_iter != l_f1);
}
for (i = 0, l_iter = BM_FACE_FIRST_LOOP(f2); i < f2len; i++, l_iter = l_iter->next) {
if (l_iter != l_f2) {
/* as soon as a duplicate is found, bail out */
if (BM_elem_flag_test(l_iter->v, BM_ELEM_INTERNAL_TAG)) {
is_dupe = true;
break;
}
}
}
/* Cleanup tags. */
for (i = 0, l_iter = BM_FACE_FIRST_LOOP(f1); i < f1len; i++, l_iter = l_iter->next) {
BM_elem_flag_disable(l_iter->v, BM_ELEM_INTERNAL_TAG);
}
if (is_dupe) {
return NULL;
}
}
/* join the two loop */
l_f1->prev->next = l_f2->next;
l_f2->next->prev = l_f1->prev;
l_f1->next->prev = l_f2->prev;
l_f2->prev->next = l_f1->next;
/* if l_f1 was baseloop, make l_f1->next the base. */
if (BM_FACE_FIRST_LOOP(f1) == l_f1) {
BM_FACE_FIRST_LOOP(f1) = l_f1->next;
}
/* increase length of f1 */
f1->len += (f2->len - 2);
/* make sure each loop points to the proper face */
newlen = f1->len;
for (i = 0, l_iter = BM_FACE_FIRST_LOOP(f1); i < newlen; i++, l_iter = l_iter->next) {
l_iter->f = f1;
}
/* remove edge from the disk cycle of its two vertices */
bmesh_disk_edge_remove(l_f1->e, l_f1->e->v1);
bmesh_disk_edge_remove(l_f1->e, l_f1->e->v2);
/* deallocate edge and its two loops as well as f2 */
if (bm->etoolflagpool) {
BLI_mempool_free(bm->etoolflagpool, ((BMEdge_OFlag *)l_f1->e)->oflags);
}
BLI_mempool_free(bm->epool, l_f1->e);
bm->totedge--;
BLI_mempool_free(bm->lpool, l_f1);
bm->totloop--;
BLI_mempool_free(bm->lpool, l_f2);
bm->totloop--;
if (bm->ftoolflagpool) {
BLI_mempool_free(bm->ftoolflagpool, ((BMFace_OFlag *)f2)->oflags);
}
BLI_mempool_free(bm->fpool, f2);
bm->totface--;
/* account for both above */
bm->elem_index_dirty |= BM_EDGE | BM_LOOP | BM_FACE;
BM_CHECK_ELEMENT(f1);
/* validate the new loop cycle */
edok = bmesh_loop_validate(f1);
BMESH_ASSERT(edok != false);
return f1;
}
/**
* Check if splicing vertices would create any double edges.
*
* \note assume caller will handle case where verts share an edge.
*/
bool BM_vert_splice_check_double(BMVert *v_a, BMVert *v_b)
{
bool is_double = false;
BLI_assert(BM_edge_exists(v_a, v_b) == false);
if (v_a->e && v_b->e) {
BMEdge *e, *e_first;
#define VERT_VISIT _FLAG_WALK
/* tag 'v_a' */
e = e_first = v_a->e;
do {
BMVert *v_other = BM_edge_other_vert(e, v_a);
BLI_assert(!BM_ELEM_API_FLAG_TEST(v_other, VERT_VISIT));
BM_ELEM_API_FLAG_ENABLE(v_other, VERT_VISIT);
} while ((e = BM_DISK_EDGE_NEXT(e, v_a)) != e_first);
/* check 'v_b' connects to 'v_a' edges */
e = e_first = v_b->e;
do {
BMVert *v_other = BM_edge_other_vert(e, v_b);
if (BM_ELEM_API_FLAG_TEST(v_other, VERT_VISIT)) {
is_double = true;
break;
}
} while ((e = BM_DISK_EDGE_NEXT(e, v_b)) != e_first);
/* cleanup */
e = e_first = v_a->e;
do {
BMVert *v_other = BM_edge_other_vert(e, v_a);
BLI_assert(BM_ELEM_API_FLAG_TEST(v_other, VERT_VISIT));
BM_ELEM_API_FLAG_DISABLE(v_other, VERT_VISIT);
} while ((e = BM_DISK_EDGE_NEXT(e, v_a)) != e_first);
#undef VERT_VISIT
}
return is_double;
}
/**
* \brief Splice Vert
*
* Merges two verts into one
* (\a v_src into \a v_dst, removing \a v_src).
*
* \return Success
*
* \warning This doesn't work for collapsing edges,
* where \a v and \a vtarget are connected by an edge
* (assert checks for this case).
*/
bool BM_vert_splice(BMesh *bm, BMVert *v_dst, BMVert *v_src)
{
BMEdge *e;
/* verts already spliced */
if (v_src == v_dst) {
return false;
}
BLI_assert(BM_vert_pair_share_face_check(v_src, v_dst) == false);
/* move all the edges from 'v_src' disk to 'v_dst' */
while ((e = v_src->e)) {
bmesh_edge_vert_swap(e, v_dst, v_src);
BLI_assert(e->v1 != e->v2);
}
BM_CHECK_ELEMENT(v_src);
BM_CHECK_ELEMENT(v_dst);
/* 'v_src' is unused now, and can be killed */
BM_vert_kill(bm, v_src);
return true;
}
/* -------------------------------------------------------------------- */
/** \name BM_vert_separate, bmesh_kernel_vert_separate and friends
* \{ */
/* BM_edge_face_count(e) >= 1 */
BLI_INLINE bool bm_edge_supports_separate(const BMEdge *e)
{
return (e->l && e->l->radial_next != e->l);
}
/**
* \brief Separate Vert
*
* Separates all disjoint fans that meet at a vertex, making a unique
* vertex for each region. returns an array of all resulting vertices.
*
* \note this is a low level function, bm_edge_separate needs to run on edges first
* or, the faces sharing verts must not be sharing edges for them to split at least.
*
* \return Success
*/
void bmesh_kernel_vert_separate(
BMesh *bm, BMVert *v, BMVert ***r_vout, int *r_vout_len, const bool copy_select)
{
int v_edges_num = 0;
/* Detailed notes on array use since this is stack memory, we have to be careful */
/* newly created vertices, only use when 'r_vout' is set
* (total size will be number of fans) */
BLI_SMALLSTACK_DECLARE(verts_new, BMVert *);
/* fill with edges from the face-fan, clearing on completion
* (total size will be max fan edge count) */
BLI_SMALLSTACK_DECLARE(edges, BMEdge *);
/* temp store edges to walk over when filling 'edges',
* (total size will be max radial edges of any edge) */
BLI_SMALLSTACK_DECLARE(edges_search, BMEdge *);
/* number of resulting verts, include self */
int verts_num = 1;
/* track the total number of edges handled, so we know when we've found the last fan */
int edges_found = 0;
#define EDGE_VISIT _FLAG_WALK
/* count and flag at once */
if (v->e) {
BMEdge *e_first, *e_iter;
e_iter = e_first = v->e;
do {
v_edges_num += 1;
BLI_assert(!BM_ELEM_API_FLAG_TEST(e_iter, EDGE_VISIT));
BM_ELEM_API_FLAG_ENABLE(e_iter, EDGE_VISIT);
} while ((e_iter = bmesh_disk_edge_next(e_iter, v)) != e_first);
while (true) {
/* Considering only edges and faces incident on vertex v, walk
* the edges & collect in the 'edges' list for splitting */
BMEdge *e = v->e;
BM_ELEM_API_FLAG_DISABLE(e, EDGE_VISIT);
do {
BLI_assert(!BM_ELEM_API_FLAG_TEST(e, EDGE_VISIT));
BLI_SMALLSTACK_PUSH(edges, e);
edges_found += 1;
if (e->l) {
BMLoop *l_iter, *l_first;
l_iter = l_first = e->l;
do {
BMLoop *l_adjacent = (l_iter->v == v) ? l_iter->prev : l_iter->next;
BLI_assert(BM_vert_in_edge(l_adjacent->e, v));
if (BM_ELEM_API_FLAG_TEST(l_adjacent->e, EDGE_VISIT)) {
BM_ELEM_API_FLAG_DISABLE(l_adjacent->e, EDGE_VISIT);
BLI_SMALLSTACK_PUSH(edges_search, l_adjacent->e);
}
} while ((l_iter = l_iter->radial_next) != l_first);
}
} while ((e = BLI_SMALLSTACK_POP(edges_search)));
/* now we have all edges connected to 'v->e' */
BLI_assert(edges_found <= v_edges_num);
if (edges_found == v_edges_num) {
/* We're done! The remaining edges in 'edges' form the last fan,
* which can be left as is.
* if 'edges' were alloc'd it'd be freed here. */
break;
}
BMVert *v_new;
v_new = BM_vert_create(bm, v->co, v, BM_CREATE_NOP);
if (copy_select) {
BM_elem_select_copy(bm, v_new, v);
}
while ((e = BLI_SMALLSTACK_POP(edges))) {
bmesh_edge_vert_swap(e, v_new, v);
}
if (r_vout) {
BLI_SMALLSTACK_PUSH(verts_new, v_new);
}
verts_num += 1;
}
}
#undef EDGE_VISIT
/* flags are clean now, handle return values */
if (r_vout_len != NULL) {
*r_vout_len = verts_num;
}
if (r_vout != NULL) {
BMVert **verts;
verts = MEM_mallocN(sizeof(BMVert *) * verts_num, __func__);
*r_vout = verts;
verts[0] = v;
BLI_SMALLSTACK_AS_TABLE(verts_new, &verts[1]);
}
}
/**
* Utility function for #BM_vert_separate
*
* Takes a list of edges, which have been split from their original.
*
* Any edges which failed to split off in #bmesh_kernel_vert_separate
* will be merged back into the original edge.
*
* \param edges_separate:
* A list-of-lists, each list is from a single original edge (the first edge is the original),
* Check for duplicates (not just with the first) but between all.
* This is O(n2) but radial edges are very rarely >2 and almost never >~10.
*
* \note typically its best to avoid creating the data in the first place,
* but inspecting all loops connectivity is quite involved.
*
* \note this function looks like it could become slow,
* but in common cases its only going to iterate a few times.
*/
static void bmesh_kernel_vert_separate__cleanup(BMesh *bm, LinkNode *edges_separate)
{
do {
LinkNode *n_orig = edges_separate->link;
do {
LinkNode *n_prev = n_orig;
LinkNode *n_step = n_orig->next;
BMEdge *e_orig = n_orig->link;
do {
BMEdge *e = n_step->link;
BLI_assert(e != e_orig);
if ((e->v1 == e_orig->v1) && (e->v2 == e_orig->v2) && BM_edge_splice(bm, e_orig, e)) {
/* don't visit again */
n_prev->next = n_step->next;
}
else {
n_prev = n_step;
}
} while ((n_step = n_step->next));
} while ((n_orig = n_orig->next) && n_orig->next);
} while ((edges_separate = edges_separate->next));
}
/**
* High level function which wraps both #bmesh_kernel_vert_separate and #bmesh_kernel_edge_separate
*/
void BM_vert_separate(BMesh *bm,
BMVert *v,
BMEdge **e_in,
int e_in_len,
const bool copy_select,
BMVert ***r_vout,
int *r_vout_len)
{
LinkNode *edges_separate = NULL;
int i;
for (i = 0; i < e_in_len; i++) {
BMEdge *e = e_in[i];
if (bm_edge_supports_separate(e)) {
LinkNode *edges_orig = NULL;
do {
BMLoop *l_sep = e->l;
bmesh_kernel_edge_separate(bm, e, l_sep, copy_select);
BLI_linklist_prepend_alloca(&edges_orig, l_sep->e);
BLI_assert(e != l_sep->e);
} while (bm_edge_supports_separate(e));
BLI_linklist_prepend_alloca(&edges_orig, e);
BLI_linklist_prepend_alloca(&edges_separate, edges_orig);
}
}
bmesh_kernel_vert_separate(bm, v, r_vout, r_vout_len, copy_select);
if (edges_separate) {
bmesh_kernel_vert_separate__cleanup(bm, edges_separate);
}
}
/**
* A version of #BM_vert_separate which takes a flag.
*/
void BM_vert_separate_hflag(BMesh *bm,
BMVert *v,
const char hflag,
const bool copy_select,
BMVert ***r_vout,
int *r_vout_len)
{
LinkNode *edges_separate = NULL;
BMEdge *e_iter, *e_first;
e_iter = e_first = v->e;
do {
if (BM_elem_flag_test(e_iter, hflag)) {
BMEdge *e = e_iter;
if (bm_edge_supports_separate(e)) {
LinkNode *edges_orig = NULL;
do {
BMLoop *l_sep = e->l;
bmesh_kernel_edge_separate(bm, e, l_sep, copy_select);
/* trick to avoid looping over separated edges */
if (edges_separate == NULL && edges_orig == NULL) {
e_first = l_sep->e;
}
BLI_linklist_prepend_alloca(&edges_orig, l_sep->e);
BLI_assert(e != l_sep->e);
} while (bm_edge_supports_separate(e));
BLI_linklist_prepend_alloca(&edges_orig, e);
BLI_linklist_prepend_alloca(&edges_separate, edges_orig);
}
}
} while ((e_iter = BM_DISK_EDGE_NEXT(e_iter, v)) != e_first);
bmesh_kernel_vert_separate(bm, v, r_vout, r_vout_len, copy_select);
if (edges_separate) {
bmesh_kernel_vert_separate__cleanup(bm, edges_separate);
}
}
void BM_vert_separate_tested_edges(BMesh *UNUSED(bm),
BMVert *v_dst,
BMVert *v_src,
bool (*testfn)(BMEdge *, void *arg),
void *arg)
{
LinkNode *edges_hflag = NULL;
BMEdge *e_iter, *e_first;
e_iter = e_first = v_src->e;
do {
if (testfn(e_iter, arg)) {
BLI_linklist_prepend_alloca(&edges_hflag, e_iter);
}
} while ((e_iter = BM_DISK_EDGE_NEXT(e_iter, v_src)) != e_first);
if (edges_hflag) {
do {
e_iter = edges_hflag->link;
bmesh_disk_vert_replace(e_iter, v_dst, v_src);
} while ((edges_hflag = edges_hflag->next));
}
}
/** \} */
/**
* \brief Splice Edge
*
* Splice two unique edges which share the same two vertices into one edge.
* (\a e_src into \a e_dst, removing e_src).
*
* \return Success
*
* \note Edges must already have the same vertices.
*/
bool BM_edge_splice(BMesh *bm, BMEdge *e_dst, BMEdge *e_src)
{
BMLoop *l;
if (!BM_vert_in_edge(e_src, e_dst->v1) || !BM_vert_in_edge(e_src, e_dst->v2)) {
/* not the same vertices can't splice */
/* the caller should really make sure this doesn't happen ever
* so assert on release builds */
BLI_assert(0);
return false;
}
while (e_src->l) {
l = e_src->l;
BLI_assert(BM_vert_in_edge(e_dst, l->v));
BLI_assert(BM_vert_in_edge(e_dst, l->next->v));
bmesh_radial_loop_remove(e_src, l);
bmesh_radial_loop_append(e_dst, l);
}
BLI_assert(bmesh_radial_length(e_src->l) == 0);
BM_CHECK_ELEMENT(e_src);
BM_CHECK_ELEMENT(e_dst);
/* removes from disks too */
BM_edge_kill(bm, e_src);
return true;
}
/**
* \brief Separate Edge
*
* Separates a single edge into two edge: the original edge and
* a new edge that has only \a l_sep in its radial.
*
* \return Success
*
* \note Does nothing if \a l_sep is already the only loop in the
* edge radial.
*/
void bmesh_kernel_edge_separate(BMesh *bm, BMEdge *e, BMLoop *l_sep, const bool copy_select)
{
BMEdge *e_new;
#ifndef NDEBUG
const int radlen = bmesh_radial_length(e->l);
#endif
BLI_assert(l_sep->e == e);
BLI_assert(e->l);
if (BM_edge_is_boundary(e)) {
BLI_assert(0); /* no cut required */
return;
}
if (l_sep == e->l) {
e->l = l_sep->radial_next;
}
e_new = BM_edge_create(bm, e->v1, e->v2, e, BM_CREATE_NOP);
bmesh_radial_loop_remove(e, l_sep);
bmesh_radial_loop_append(e_new, l_sep);
l_sep->e = e_new;
if (copy_select) {
BM_elem_select_copy(bm, e_new, e);
}
BLI_assert(bmesh_radial_length(e->l) == radlen - 1);
BLI_assert(bmesh_radial_length(e_new->l) == 1);
BM_CHECK_ELEMENT(e_new);
BM_CHECK_ELEMENT(e);
}
/**
* \brief Un-glue Region Make Vert (URMV)
*
* Disconnects a face from its vertex fan at loop \a l_sep
*
* \return The newly created BMVert
*
* \note Will be a no-op and return original vertex if only two edges at that vertex.
*/
BMVert *bmesh_kernel_unglue_region_make_vert(BMesh *bm, BMLoop *l_sep)
{
BMVert *v_new = NULL;
BMVert *v_sep = l_sep->v;
BMEdge *e_iter;
BMEdge *edges[2];
int i;
/* peel the face from the edge radials on both sides of the
* loop vert, disconnecting the face from its fan */
if (!BM_edge_is_boundary(l_sep->e)) {
bmesh_kernel_edge_separate(bm, l_sep->e, l_sep, false);
}
if (!BM_edge_is_boundary(l_sep->prev->e)) {
bmesh_kernel_edge_separate(bm, l_sep->prev->e, l_sep->prev, false);
}
/* do inline, below */
#if 0
if (BM_vert_edge_count_is_equal(v_sep, 2)) {
return v_sep;
}
#endif
/* Search for an edge unattached to this loop */
e_iter = v_sep->e;
while (!ELEM(e_iter, l_sep->e, l_sep->prev->e)) {
e_iter = bmesh_disk_edge_next(e_iter, v_sep);
/* We've come back around to the initial edge, all touch this loop.
* If there are still only two edges out of v_sep,
* then this whole URMV was just a no-op, so exit now. */
if (e_iter == v_sep->e) {
BLI_assert(BM_vert_edge_count_is_equal(v_sep, 2));
return v_sep;
}
}
v_sep->e = l_sep->e;
v_new = BM_vert_create(bm, v_sep->co, v_sep, BM_CREATE_NOP);
edges[0] = l_sep->e;
edges[1] = l_sep->prev->e;
for (i = 0; i < ARRAY_SIZE(edges); i++) {
BMEdge *e = edges[i];
bmesh_edge_vert_swap(e, v_new, v_sep);
}
BLI_assert(v_sep != l_sep->v);
BLI_assert(v_sep->e != l_sep->v->e);
BM_CHECK_ELEMENT(l_sep);
BM_CHECK_ELEMENT(v_sep);
BM_CHECK_ELEMENT(edges[0]);
BM_CHECK_ELEMENT(edges[1]);
BM_CHECK_ELEMENT(v_new);
return v_new;
}
/**
* A version of #bmesh_kernel_unglue_region_make_vert that disconnects multiple loops at once.
* The loops must all share the same vertex, can be in any order
* and are all moved to use a single new vertex - which is returned.
*
* This function handles the details of finding fans boundaries.
*/
BMVert *bmesh_kernel_unglue_region_make_vert_multi(BMesh *bm, BMLoop **larr, int larr_len)
{
BMVert *v_sep = larr[0]->v;
BMVert *v_new;
int edges_len = 0;
int i;
/* any edges not owned by 'larr' loops connected to 'v_sep'? */
bool is_mixed_edge_any = false;
/* any loops not owned by 'larr' radially connected to 'larr' loop edges? */
bool is_mixed_loop_any = false;
#define LOOP_VISIT _FLAG_WALK
#define EDGE_VISIT _FLAG_WALK
for (i = 0; i < larr_len; i++) {
BMLoop *l_sep = larr[i];
/* all must be from the same vert! */
BLI_assert(v_sep == l_sep->v);
BLI_assert(!BM_ELEM_API_FLAG_TEST(l_sep, LOOP_VISIT));
BM_ELEM_API_FLAG_ENABLE(l_sep, LOOP_VISIT);
/* weak! but it makes it simpler to check for edges to split
* while doing a radial loop (where loops may be adjacent) */
BM_ELEM_API_FLAG_ENABLE(l_sep->next, LOOP_VISIT);
BM_ELEM_API_FLAG_ENABLE(l_sep->prev, LOOP_VISIT);
BMLoop *loop_pair[2] = {l_sep, l_sep->prev};
for (int j = 0; j < ARRAY_SIZE(loop_pair); j++) {
BMEdge *e = loop_pair[j]->e;
if (!BM_ELEM_API_FLAG_TEST(e, EDGE_VISIT)) {
BM_ELEM_API_FLAG_ENABLE(e, EDGE_VISIT);
edges_len += 1;
}
}
}
BMEdge **edges = BLI_array_alloca(edges, edges_len);
STACK_DECLARE(edges);
STACK_INIT(edges, edges_len);
{
BMEdge *e_first, *e_iter;
e_iter = e_first = v_sep->e;
do {
if (BM_ELEM_API_FLAG_TEST(e_iter, EDGE_VISIT)) {
BMLoop *l_iter, *l_first;
bool is_mixed_loop = false;
l_iter = l_first = e_iter->l;
do {
if (!BM_ELEM_API_FLAG_TEST(l_iter, LOOP_VISIT)) {
is_mixed_loop = true;
break;
}
} while ((l_iter = l_iter->radial_next) != l_first);
if (is_mixed_loop) {
/* ensure the first loop is one we don't own so we can do a quick check below
* on the edge's loop-flag to see if the edge is mixed or not. */
e_iter->l = l_iter;
is_mixed_loop_any = true;
}
STACK_PUSH(edges, e_iter);
}
else {
/* at least one edge attached isn't connected to our loops */
is_mixed_edge_any = true;
}
} while ((e_iter = bmesh_disk_edge_next(e_iter, v_sep)) != e_first);
}
BLI_assert(edges_len == STACK_SIZE(edges));
if (is_mixed_loop_any == false && is_mixed_edge_any == false) {
/* all loops in 'larr' are the sole owners of their edges.
* nothing to split away from, this is a no-op */
v_new = v_sep;
}
else {
v_new = BM_vert_create(bm, v_sep->co, v_sep, BM_CREATE_NOP);
for (i = 0; i < STACK_SIZE(edges); i++) {
BMEdge *e = edges[i];
BMLoop *l_iter, *l_first, *l_next;
BMEdge *e_new;
/* disable so copied edge isn't left dirty (loop edges are cleared last too) */
BM_ELEM_API_FLAG_DISABLE(e, EDGE_VISIT);
/* will always be false when (is_mixed_loop_any == false) */
if (!BM_ELEM_API_FLAG_TEST(e->l, LOOP_VISIT)) {
/* edge has some loops owned by us, some owned by other loops */
BMVert *e_new_v_pair[2];
if (e->v1 == v_sep) {
e_new_v_pair[0] = v_new;
e_new_v_pair[1] = e->v2;
}
else {
BLI_assert(v_sep == e->v2);
e_new_v_pair[0] = e->v1;
e_new_v_pair[1] = v_new;
}
e_new = BM_edge_create(bm, UNPACK2(e_new_v_pair), e, BM_CREATE_NOP);
/* now moved all loops from 'larr' to this newly created edge */
l_iter = l_first = e->l;
do {
l_next = l_iter->radial_next;
if (BM_ELEM_API_FLAG_TEST(l_iter, LOOP_VISIT)) {
bmesh_radial_loop_remove(e, l_iter);
bmesh_radial_loop_append(e_new, l_iter);
l_iter->e = e_new;
}
} while ((l_iter = l_next) != l_first);
}
else {
/* we own the edge entirely, replace the vert */
bmesh_disk_vert_replace(e, v_new, v_sep);
}
/* loop vert is handled last! */
}
}
for (i = 0; i < larr_len; i++) {
BMLoop *l_sep = larr[i];
l_sep->v = v_new;
BLI_assert(BM_ELEM_API_FLAG_TEST(l_sep, LOOP_VISIT));
BLI_assert(BM_ELEM_API_FLAG_TEST(l_sep->prev, LOOP_VISIT));
BLI_assert(BM_ELEM_API_FLAG_TEST(l_sep->next, LOOP_VISIT));
BM_ELEM_API_FLAG_DISABLE(l_sep, LOOP_VISIT);
BM_ELEM_API_FLAG_DISABLE(l_sep->prev, LOOP_VISIT);
BM_ELEM_API_FLAG_DISABLE(l_sep->next, LOOP_VISIT);
BM_ELEM_API_FLAG_DISABLE(l_sep->prev->e, EDGE_VISIT);
BM_ELEM_API_FLAG_DISABLE(l_sep->e, EDGE_VISIT);
}
#undef LOOP_VISIT
#undef EDGE_VISIT
return v_new;
}
static void bmesh_edge_vert_swap__recursive(BMEdge *e, BMVert *v_dst, BMVert *v_src)
{
BMLoop *l_iter, *l_first;
BLI_assert(ELEM(v_src, e->v1, e->v2));
bmesh_disk_vert_replace(e, v_dst, v_src);
l_iter = l_first = e->l;
do {
if (l_iter->v == v_src) {
l_iter->v = v_dst;
if (BM_vert_in_edge(l_iter->prev->e, v_src)) {
bmesh_edge_vert_swap__recursive(l_iter->prev->e, v_dst, v_src);
}
}
else if (l_iter->next->v == v_src) {
l_iter->next->v = v_dst;
if (BM_vert_in_edge(l_iter->next->e, v_src)) {
bmesh_edge_vert_swap__recursive(l_iter->next->e, v_dst, v_src);
}
}
else {
BLI_assert(l_iter->prev->v != v_src);
}
} while ((l_iter = l_iter->radial_next) != l_first);
}
/**
* This function assumes l_sep is a part of a larger fan which has already been
* isolated by calling #bmesh_kernel_edge_separate to segregate it radially.
*/
BMVert *bmesh_kernel_unglue_region_make_vert_multi_isolated(BMesh *bm, BMLoop *l_sep)
{
BMVert *v_new = BM_vert_create(bm, l_sep->v->co, l_sep->v, BM_CREATE_NOP);
/* passing either 'l_sep->e', 'l_sep->prev->e' will work */
bmesh_edge_vert_swap__recursive(l_sep->e, v_new, l_sep->v);
BLI_assert(l_sep->v == v_new);
return v_new;
}
/**
* Avoid calling this where possible,
* low level function so both face pointers remain intact but point to swapped data.
* \note must be from the same bmesh.
*/
void bmesh_face_swap_data(BMFace *f_a, BMFace *f_b)
{
BMLoop *l_iter, *l_first;
BLI_assert(f_a != f_b);
l_iter = l_first = BM_FACE_FIRST_LOOP(f_a);
do {
l_iter->f = f_b;
} while ((l_iter = l_iter->next) != l_first);
l_iter = l_first = BM_FACE_FIRST_LOOP(f_b);
do {
l_iter->f = f_a;
} while ((l_iter = l_iter->next) != l_first);
SWAP(BMFace, (*f_a), (*f_b));
/* swap back */
SWAP(void *, f_a->head.data, f_b->head.data);
SWAP(int, f_a->head.index, f_b->head.index);
}
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