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
71 lines
3.1 KiB
C
71 lines
3.1 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 __tessmono_h_
|
|
#define __tessmono_h_
|
|
|
|
/* __gl_meshTessellateMonoRegion( face ) tessellates a monotone region
|
|
* (what else would it do??) The region must consist of a single
|
|
* loop of half-edges (see mesh.h) oriented CCW. "Monotone" in this
|
|
* case means that any vertical line intersects the interior of the
|
|
* region in a single interval.
|
|
*
|
|
* Tessellation consists of adding interior edges (actually pairs of
|
|
* half-edges), to split the region into non-overlapping triangles.
|
|
*
|
|
* __gl_meshTessellateInterior( mesh ) tessellates each region of
|
|
* the mesh which is marked "inside" the polygon. Each such region
|
|
* must be monotone.
|
|
*
|
|
* __gl_meshDiscardExterior( mesh ) zaps (ie. sets to NULL) all faces
|
|
* which are not marked "inside" the polygon. Since further mesh operations
|
|
* on NULL faces are not allowed, the main purpose is to clean up the
|
|
* mesh so that exterior loops are not represented in the data structure.
|
|
*
|
|
* __gl_meshSetWindingNumber( mesh, value, keepOnlyBoundary ) resets the
|
|
* winding numbers on all edges so that regions marked "inside" the
|
|
* polygon have a winding number of "value", and regions outside
|
|
* have a winding number of 0.
|
|
*
|
|
* If keepOnlyBoundary is TRUE, it also deletes all edges which do not
|
|
* separate an interior region from an exterior one.
|
|
*/
|
|
|
|
int __gl_meshTessellateMonoRegion( GLUface *face );
|
|
int __gl_meshTessellateInterior( GLUmesh *mesh );
|
|
void __gl_meshDiscardExterior( GLUmesh *mesh );
|
|
int __gl_meshSetWindingNumber( GLUmesh *mesh, int value,
|
|
GLboolean keepOnlyBoundary );
|
|
|
|
#endif
|