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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): Joseph Eagar.
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef __BMESH_WALKERS_H__
#define __BMESH_WALKERS_H__
/** \file blender/bmesh/intern/bmesh_walkers.h
* \ingroup bmesh
*/
/*
* NOTE: do NOT modify topology while walking a mesh!
*/
typedef enum {
BMW_DEPTH_FIRST,
BMW_BREADTH_FIRST
} BMWOrder;
typedef enum {
BMW_FLAG_NOP = 0,
BMW_FLAG_TEST_HIDDEN = (1 << 0)
} BMWFlag;
/*Walkers*/
typedef struct BMWalker {
char begin_htype; /* only for validating input */
void (*begin) (struct BMWalker *walker, void *start);
void *(*step) (struct BMWalker *walker);
void *(*yield) (struct BMWalker *walker);
int structsize;
BMWOrder order;
int valid_mask;
/* runtime */
int layer;
BMesh *bm;
BLI_mempool *worklist;
ListBase states;
/* these masks are to be tested against elements BMO_elem_flag_test(),
* should never be accessed directly only through BMW_init() and bmw_mask_check_*() functions */
short mask_vert;
short mask_edge;
short mask_face;
BMWFlag flag;
struct GSet *visit_set;
struct GSet *visit_set_alt;
int depth;
} BMWalker;
/* define to make BMW_init more clear */
#define BMW_MASK_NOP 0
/* initialize a walker. searchmask restricts some (not all) walkers to
* elements with a specific tool flag set. flags is specific to each walker.*/
void BMW_init(struct BMWalker *walker, BMesh *bm, int type,
short mask_vert, short mask_edge, short mask_face,
BMWFlag flag,
int layer);
void *BMW_begin(BMWalker *walker, void *start);
void *BMW_step(struct BMWalker *walker);
void BMW_end(struct BMWalker *walker);
int BMW_current_depth(BMWalker *walker);
/*these are used by custom walkers*/
void *BMW_current_state(BMWalker *walker);
void *BMW_state_add(BMWalker *walker);
void BMW_state_remove(BMWalker *walker);
void *BMW_walk(BMWalker *walker);
void BMW_reset(BMWalker *walker);
/*
* example of usage, walking over an island of tool flagged faces:
*
* BMWalker walker;
* BMFace *f;
*
* BMW_init(&walker, bm, BMW_ISLAND, SOME_OP_FLAG);
*
* for (f = BMW_begin(&walker, some_start_face); f; f = BMW_step(&walker)) {
* // do something with f
* }
* BMW_end(&walker);
*/
enum {
BMW_VERT_SHELL,
BMW_FACE_SHELL,
BMW_LOOP,
BMW_FACELOOP,
BMW_EDGERING,
BMW_EDGEBOUNDARY,
/* BMW_RING, */
BMW_LOOPDATA_ISLAND,
BMW_ISLANDBOUND,
BMW_ISLAND,
BMW_CONNECTED_VERTEX,
/* end of array index enum vals */
/* do not intitialze function pointers and struct size in BMW_init */
BMW_CUSTOM,
BMW_MAXWALKERS
};
/* use with BMW_init, so as not to confuse with restrict flags */
#define BMW_NIL_LAY 0
#endif /* __BMESH_WALKERS_H__ */
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