mirror of
https://github.com/brl/mutter.git
synced 2024-11-22 16:10:41 -05:00
b86e330957
This copies the files for the GLU tesselator from Mesa. The Mesa code is based on the original SGI code and is released under a BSD license. The memalloc.h header has been replaced with one that forces the code to use g_malloc and friends. The rest of the files are not altered from the original so it should be possible to later upgrade the files by simply overwriting them. There is a tesselator.h header which is expected to be included by rest of Cogl to use the tesselator. This contains a trimmed down version of glu.h that only includes parts that pertain to the tesselator. There is also a stub glu.h in the GL directory which is just provided so that the tesselator code can include <GL/gl.h> without depending on the system header. It just redirects to tesselator.h
78 lines
3.3 KiB
C
78 lines
3.3 KiB
C
/*
|
|
* 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
|
|
* 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"
|
|
|
|
/* __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
|