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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.
*
* The Original Code is Copyright (C) Blender Foundation
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): Lukas Toenne
*
* ***** END GPL LICENSE BLOCK *****
*/
/** \file blender/editors/hair/hair_mirror.c
* \ingroup edhair
*/
#include <stdlib.h>
#include "MEM_guardedalloc.h"
#include "BLI_utildefines.h"
#include "BLI_math.h"
#include "BKE_editmesh_bvh.h"
#include "BKE_editstrands.h"
#include "ED_physics.h"
#include "ED_util.h"
#include "bmesh.h"
#include "hair_intern.h"
/* TODO use_topology is not yet implemented for strands.
* Native strand topology is not very useful for this.
* Instead, the topology of the scalp mesh should be used for finding mirrored strand roots,
* then the arc- or parametric length of a vertex from the root to find mirrored verts.
*/
#define BM_SEARCH_MAXDIST_MIRR 0.00002f
#define BM_CD_LAYER_ID "__mirror_index"
/**
* \param edit Edit strands.
* \param use_self Allow a vertex to point to its self (middle verts).
* \param use_select Restrict to selected verts.
* \param use_topology Use topology mirror.
* \param maxdist Distance for close point test.
* \param r_index Optional array to write into, as an alternative to a customdata layer (length of total verts).
*/
void ED_strands_mirror_cache_begin_ex(BMEditStrands *edit, const int axis, const bool use_self, const bool use_select,
/* extra args */
const bool UNUSED(use_topology), float maxdist, int *r_index)
{
BMesh *bm = edit->bm;
BMIter iter;
BMVert *v;
int cd_vmirr_offset;
int i;
/* one or the other is used depending if topo is enabled */
struct BMBVHTree *tree = NULL;
BM_mesh_elem_table_ensure(bm, BM_VERT);
if (r_index == NULL) {
const char *layer_id = BM_CD_LAYER_ID;
edit->mirror_cdlayer = CustomData_get_named_layer_index(&bm->vdata, CD_PROP_INT, layer_id);
if (edit->mirror_cdlayer == -1) {
BM_data_layer_add_named(bm, &bm->vdata, CD_PROP_INT, layer_id);
edit->mirror_cdlayer = CustomData_get_named_layer_index(&bm->vdata, CD_PROP_INT, layer_id);
}
cd_vmirr_offset = CustomData_get_n_offset(&bm->vdata, CD_PROP_INT,
edit->mirror_cdlayer - CustomData_get_layer_index(&bm->vdata, CD_PROP_INT));
bm->vdata.layers[edit->mirror_cdlayer].flag |= CD_FLAG_TEMPORARY;
}
BM_mesh_elem_index_ensure(bm, BM_VERT);
tree = BKE_bmbvh_new(edit->bm, NULL, 0, 0, NULL, false);
#define VERT_INTPTR(_v, _i) r_index ? &r_index[_i] : BM_ELEM_CD_GET_VOID_P(_v, cd_vmirr_offset);
BM_ITER_MESH_INDEX (v, &iter, bm, BM_VERTS_OF_MESH, i) {
BLI_assert(BM_elem_index_get(v) == i);
/* temporary for testing, check for selection */
if (use_select && !BM_elem_flag_test(v, BM_ELEM_SELECT)) {
/* do nothing */
}
else {
BMVert *v_mirr;
float co[3];
int *idx = VERT_INTPTR(v, i);
copy_v3_v3(co, v->co);
co[axis] *= -1.0f;
v_mirr = BKE_bmbvh_find_vert_closest(tree, co, maxdist);
if (v_mirr && (use_self || (v_mirr != v))) {
const int i_mirr = BM_elem_index_get(v_mirr);
*idx = i_mirr;
idx = VERT_INTPTR(v_mirr, i_mirr);
*idx = i;
}
else {
*idx = -1;
}
}
}
#undef VERT_INTPTR
BKE_bmbvh_free(tree);
}
void ED_strands_mirror_cache_begin(BMEditStrands *edit, const int axis,
const bool use_self, const bool use_select,
const bool use_topology)
{
ED_strands_mirror_cache_begin_ex(edit, axis,
use_self, use_select,
/* extra args */
use_topology, BM_SEARCH_MAXDIST_MIRR, NULL);
}
BMVert *ED_strands_mirror_get(BMEditStrands *edit, BMVert *v)
{
const int *mirr = CustomData_bmesh_get_layer_n(&edit->bm->vdata, v->head.data, edit->mirror_cdlayer);
BLI_assert(edit->mirror_cdlayer != -1); /* invalid use */
if (mirr && *mirr >= 0 && *mirr < edit->bm->totvert) {
if (!edit->bm->vtable) {
printf("err: should only be called between "
"ED_strands_mirror_cache_begin and ED_strands_mirror_cache_end\n");
return NULL;
}
return edit->bm->vtable[*mirr];
}
return NULL;
}
BMEdge *ED_strands_mirror_get_edge(BMEditStrands *edit, BMEdge *e)
{
BMVert *v1_mirr = ED_strands_mirror_get(edit, e->v1);
if (v1_mirr) {
BMVert *v2_mirr = ED_strands_mirror_get(edit, e->v2);
if (v2_mirr) {
return BM_edge_exists(v1_mirr, v2_mirr);
}
}
return NULL;
}
void ED_strands_mirror_cache_clear(BMEditStrands *edit, BMVert *v)
{
int *mirr = CustomData_bmesh_get_layer_n(&edit->bm->vdata, v->head.data, edit->mirror_cdlayer);
BLI_assert(edit->mirror_cdlayer != -1); /* invalid use */
if (mirr) {
*mirr = -1;
}
}
void ED_strands_mirror_cache_end(BMEditStrands *edit)
{
edit->mirror_cdlayer = -1;
}
void ED_strands_mirror_apply(BMEditStrands *edit, const int sel_from, const int sel_to)
{
BMIter iter;
BMVert *v;
BLI_assert((edit->bm->vtable != NULL) && ((edit->bm->elem_table_dirty & BM_VERT) == 0));
BM_ITER_MESH (v, &iter, edit->bm, BM_VERTS_OF_MESH) {
if (BM_elem_flag_test(v, BM_ELEM_SELECT) == sel_from) {
BMVert *mirr = ED_strands_mirror_get(edit, v);
if (mirr) {
if (BM_elem_flag_test(mirr, BM_ELEM_SELECT) == sel_to) {
copy_v3_v3(mirr->co, v->co);
mirr->co[0] *= -1.0f;
}
}
}
}
}
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