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75 lines
3.1 KiB
C
75 lines
3.1 KiB
C
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/*
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** SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
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** Copyright (C) [dates of first publication] Silicon Graphics, Inc.
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** All Rights Reserved.
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**
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** Permission is hereby granted, free of charge, to any person obtaining a copy
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** of this software and associated documentation files (the "Software"), to deal
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** in the Software without restriction, including without limitation the rights
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** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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** of the Software, and to permit persons to whom the Software is furnished to do so,
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** subject to the following conditions:
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**
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** The above copyright notice including the dates of first publication and either this
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** permission notice or a reference to http://oss.sgi.com/projects/FreeB/ shall be
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** 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 OR IMPLIED,
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** INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
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** PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL SILICON GRAPHICS, INC.
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** BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
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** OR OTHER DEALINGS IN THE SOFTWARE.
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**
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** Except as contained in this notice, the name of Silicon Graphics, Inc. shall not
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** be used in advertising or otherwise to promote the sale, use or other dealings in
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** this Software without prior written authorization from 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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#ifndef SWEEP_H
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#define SWEEP_H
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#include "mesh.h"
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/* tessComputeInterior( 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 tessComputeInterior( TESStesselator *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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TESShalfEdge *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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int inside; /* is this region inside the polygon? */
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int sentinel; /* marks fake edges at t = +/-infinity */
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int 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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int 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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