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77 lines
3.3 KiB
C
77 lines
3.3 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 __sweep_h_
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#define __sweep_h_
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#include "mesh.h"
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/* __gl_computeInterior( tess ) computes the planar arrangement specified
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* by the given contours, and further subdivides this arrangement
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* into regions. Each region is marked "inside" if it belongs
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* to the polygon, according to the rule given by tess->windingRule.
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* Each interior region is guaranteed be monotone.
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*/
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int __gl_computeInterior( GLUtesselator *tess );
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/* The following is here *only* for access by debugging routines */
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#include "dict.h"
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/* For each pair of adjacent edges crossing the sweep line, there is
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* an ActiveRegion to represent the region between them. The active
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* regions are kept in sorted order in a dynamic dictionary. As the
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* sweep line crosses each vertex, we update the affected regions.
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*/
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struct ActiveRegion {
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GLUhalfEdge *eUp; /* upper edge, directed right to left */
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DictNode *nodeUp; /* dictionary node corresponding to eUp */
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int windingNumber; /* used to determine which regions are
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* inside the polygon */
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GLboolean inside; /* is this region inside the polygon? */
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GLboolean sentinel; /* marks fake edges at t = +/-infinity */
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GLboolean dirty; /* marks regions where the upper or lower
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* edge has changed, but we haven't checked
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* whether they intersect yet */
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GLboolean fixUpperEdge; /* marks temporary edges introduced when
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* we process a "right vertex" (one without
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* any edges leaving to the right) */
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};
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#define RegionBelow(r) ((ActiveRegion *) dictKey(dictPred((r)->nodeUp)))
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#define RegionAbove(r) ((ActiveRegion *) dictKey(dictSucc((r)->nodeUp)))
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#endif
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