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author | Konstantin Käfer <mail@kkaefer.com> | 2014-02-17 12:45:57 +0100 |
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committer | Konstantin Käfer <mail@kkaefer.com> | 2014-02-17 12:45:57 +0100 |
commit | b087c35c98ba31cd0e27d15a6c61d18664bc981a (patch) | |
tree | 0466a2ad436efcd6c641f0cbd64472a630129067 /src/libtess2/sweep.h | |
parent | d1910f0e040e97b36f0f8b12035a63f628279595 (diff) | |
download | qtlocation-mapboxgl-b087c35c98ba31cd0e27d15a6c61d18664bc981a.tar.gz |
add tessellation library
Diffstat (limited to 'src/libtess2/sweep.h')
-rwxr-xr-x | src/libtess2/sweep.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/libtess2/sweep.h b/src/libtess2/sweep.h new file mode 100755 index 0000000000..95bd65a49a --- /dev/null +++ b/src/libtess2/sweep.h @@ -0,0 +1,74 @@ +/* +** SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008) +** Copyright (C) [dates of first publication] Silicon Graphics, Inc. +** All Rights Reserved. +** +** Permission is hereby granted, free of charge, to any person obtaining a copy +** of this software and associated documentation files (the "Software"), to deal +** in the Software without restriction, including without limitation the rights +** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies +** of the Software, and to permit persons to whom the Software is furnished to do so, +** subject to the following conditions: +** +** The above copyright notice including the dates of first publication and either this +** permission notice or a reference to http://oss.sgi.com/projects/FreeB/ shall be +** included in all copies or substantial portions of the Software. +** +** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, +** INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A +** PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL SILICON GRAPHICS, INC. +** BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, +** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE +** OR OTHER DEALINGS IN THE SOFTWARE. +** +** Except as contained in this notice, the name of Silicon Graphics, Inc. shall not +** be used in advertising or otherwise to promote the sale, use or other dealings in +** this Software without prior written authorization from Silicon Graphics, Inc. +*/ +/* +** Author: Eric Veach, July 1994. +*/ + +#ifndef SWEEP_H +#define SWEEP_H + +#include "mesh.h" + +/* tessComputeInterior( tess ) computes the planar arrangement specified +* by the given contours, and further subdivides this arrangement +* into regions. Each region is marked "inside" if it belongs +* to the polygon, according to the rule given by tess->windingRule. +* Each interior region is guaranteed be monotone. +*/ +int tessComputeInterior( TESStesselator *tess ); + + +/* The following is here *only* for access by debugging routines */ + +#include "dict.h" + +/* For each pair of adjacent edges crossing the sweep line, there is +* an ActiveRegion to represent the region between them. The active +* regions are kept in sorted order in a dynamic dictionary. As the +* sweep line crosses each vertex, we update the affected regions. +*/ + +struct ActiveRegion { + TESShalfEdge *eUp; /* upper edge, directed right to left */ + DictNode *nodeUp; /* dictionary node corresponding to eUp */ + int windingNumber; /* used to determine which regions are + * inside the polygon */ + int inside; /* is this region inside the polygon? */ + int sentinel; /* marks fake edges at t = +/-infinity */ + int dirty; /* marks regions where the upper or lower + * edge has changed, but we haven't checked + * whether they intersect yet */ + int fixUpperEdge; /* marks temporary edges introduced when + * we process a "right vertex" (one without + * any edges leaving to the right) */ +}; + +#define RegionBelow(r) ((ActiveRegion *) dictKey(dictPred((r)->nodeUp))) +#define RegionAbove(r) ((ActiveRegion *) dictKey(dictSucc((r)->nodeUp))) + +#endif |