IABSD.fr/xenocara/lib/libGLU/src/libtess/sweep.h

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• Author : jsg
  Date : 2013-09-01 03:51:12
  Hash : 729f7da4
  Message : Update to GLU 9.0.0, GLU was previously part of Mesa but is now seperate. tested in a ports bulk build by landry@, ok matthieu@

• lib/libGLU/src/libtess/sweep.h

• /*
   * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a
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   * 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.
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   * 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
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   * Silicon Graphics, Inc.
   */
  /*
  ** Author: Eric Veach, July 1994.
  **
  */
  
  #ifndef __sweep_h_
  #define __sweep_h_
  
  #include "mesh.h"
  
  /* __gl_computeInterior( 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 __gl_computeInterior( GLUtesselator *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 {
    GLUhalfEdge	*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 */
    GLboolean	inside;		/* is this region inside the polygon? */
    GLboolean	sentinel;	/* marks fake edges at t = +/-infinity */
    GLboolean	dirty;		/* marks regions where the upper or lower
                                   * edge has changed, but we haven't checked
                                   * whether they intersect yet */
    GLboolean	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