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71 lines
3.1 KiB
C
71 lines
3.1 KiB
C
/*
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* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice including the dates of first publication and
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* either this permission notice or a reference to
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* http://oss.sgi.com/projects/FreeB/
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* shall be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
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* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Except as contained in this notice, the name of Silicon Graphics, Inc.
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* shall not be used in advertising or otherwise to promote the sale, use or
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* other dealings in this Software without prior written authorization from
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* Silicon Graphics, Inc.
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*/
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/*
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** Author: Eric Veach, July 1994.
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**
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*/
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#ifndef __tessmono_h_
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#define __tessmono_h_
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/* __gl_meshTessellateMonoRegion( face ) tessellates a monotone region
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* (what else would it do??) The region must consist of a single
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* loop of half-edges (see mesh.h) oriented CCW. "Monotone" in this
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* case means that any vertical line intersects the interior of the
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* region in a single interval.
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*
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* Tessellation consists of adding interior edges (actually pairs of
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* half-edges), to split the region into non-overlapping triangles.
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*
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* __gl_meshTessellateInterior( mesh ) tessellates each region of
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* the mesh which is marked "inside" the polygon. Each such region
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* must be monotone.
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*
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* __gl_meshDiscardExterior( mesh ) zaps (ie. sets to NULL) all faces
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* which are not marked "inside" the polygon. Since further mesh operations
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* on NULL faces are not allowed, the main purpose is to clean up the
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* mesh so that exterior loops are not represented in the data structure.
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*
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* __gl_meshSetWindingNumber( mesh, value, keepOnlyBoundary ) resets the
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* winding numbers on all edges so that regions marked "inside" the
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* polygon have a winding number of "value", and regions outside
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* have a winding number of 0.
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*
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* If keepOnlyBoundary is TRUE, it also deletes all edges which do not
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* separate an interior region from an exterior one.
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*/
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int __gl_meshTessellateMonoRegion( GLUface *face );
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int __gl_meshTessellateInterior( GLUmesh *mesh );
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void __gl_meshDiscardExterior( GLUmesh *mesh );
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int __gl_meshSetWindingNumber( GLUmesh *mesh, int value,
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GLboolean keepOnlyBoundary );
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#endif
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