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tessmono.h
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1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30/*
31** Author: Eric Veach, July 1994.
32**
33*/
34
35#ifndef __tessmono_h_
36#define __tessmono_h_
37
38/* __gl_meshTessellateMonoRegion( face ) tessellates a monotone region
39 * (what else would it do??) The region must consist of a single
40 * loop of half-edges (see mesh.h) oriented CCW. "Monotone" in this
41 * case means that any vertical line intersects the interior of the
42 * region in a single interval.
43 *
44 * Tessellation consists of adding interior edges (actually pairs of
45 * half-edges), to split the region into non-overlapping triangles.
46 *
47 * __gl_meshTessellateInterior( mesh ) tessellates each region of
48 * the mesh which is marked "inside" the polygon. Each such region
49 * must be monotone.
50 *
51 * __gl_meshDiscardExterior( mesh ) zaps (ie. sets to NULL) all faces
52 * which are not marked "inside" the polygon. Since further mesh operations
53 * on NULL faces are not allowed, the main purpose is to clean up the
54 * mesh so that exterior loops are not represented in the data structure.
55 *
56 * __gl_meshSetWindingNumber( mesh, value, keepOnlyBoundary ) resets the
57 * winding numbers on all edges so that regions marked "inside" the
58 * polygon have a winding number of "value", and regions outside
59 * have a winding number of 0.
60 *
61 * If keepOnlyBoundary is TRUE, it also deletes all edges which do not
62 * separate an interior region from an exterior one.
63 */
64
68int __gl_meshSetWindingNumber( GLUmesh *mesh, int value,
69 GLboolean keepOnlyBoundary );
70
71#endif
unsigned char GLboolean
Definition GL_glu.h:267
int __gl_meshTessellateMonoRegion(GLUface *face)
Definition tessmono.c:72
int __gl_meshSetWindingNumber(GLUmesh *mesh, int value, GLboolean keepOnlyBoundary)
Definition tessmono.c:179
void __gl_meshDiscardExterior(GLUmesh *mesh)
Definition tessmono.c:155
int __gl_meshTessellateInterior(GLUmesh *mesh)
Definition tessmono.c:133