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
84 lines
3.3 KiB
C
84 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 __geom_h_
|
|
#define __geom_h_
|
|
|
|
#include "mesh.h"
|
|
|
|
#ifdef NO_BRANCH_CONDITIONS
|
|
/* MIPS architecture has special instructions to evaluate boolean
|
|
* conditions -- more efficient than branching, IF you can get the
|
|
* compiler to generate the right instructions (SGI compiler doesn't)
|
|
*/
|
|
#define VertEq(u,v) (((u)->s == (v)->s) & ((u)->t == (v)->t))
|
|
#define VertLeq(u,v) (((u)->s < (v)->s) | \
|
|
((u)->s == (v)->s & (u)->t <= (v)->t))
|
|
#else
|
|
#define VertEq(u,v) ((u)->s == (v)->s && (u)->t == (v)->t)
|
|
#define VertLeq(u,v) (((u)->s < (v)->s) || \
|
|
((u)->s == (v)->s && (u)->t <= (v)->t))
|
|
#endif
|
|
|
|
#define EdgeEval(u,v,w) __gl_edgeEval(u,v,w)
|
|
#define EdgeSign(u,v,w) __gl_edgeSign(u,v,w)
|
|
|
|
/* Versions of VertLeq, EdgeSign, EdgeEval with s and t transposed. */
|
|
|
|
#define TransLeq(u,v) (((u)->t < (v)->t) || \
|
|
((u)->t == (v)->t && (u)->s <= (v)->s))
|
|
#define TransEval(u,v,w) __gl_transEval(u,v,w)
|
|
#define TransSign(u,v,w) __gl_transSign(u,v,w)
|
|
|
|
|
|
#define EdgeGoesLeft(e) VertLeq( (e)->Dst, (e)->Org )
|
|
#define EdgeGoesRight(e) VertLeq( (e)->Org, (e)->Dst )
|
|
|
|
#undef ABS
|
|
#define ABS(x) ((x) < 0 ? -(x) : (x))
|
|
#define VertL1dist(u,v) (ABS(u->s - v->s) + ABS(u->t - v->t))
|
|
|
|
#define VertCCW(u,v,w) __gl_vertCCW(u,v,w)
|
|
|
|
int __gl_vertLeq( GLUvertex *u, GLUvertex *v );
|
|
GLdouble __gl_edgeEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
|
|
GLdouble __gl_edgeSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
|
|
GLdouble __gl_transEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
|
|
GLdouble __gl_transSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
|
|
int __gl_vertCCW( GLUvertex *u, GLUvertex *v, GLUvertex *w );
|
|
void __gl_edgeIntersect( GLUvertex *o1, GLUvertex *d1,
|
|
GLUvertex *o2, GLUvertex *d2,
|
|
GLUvertex *v );
|
|
|
|
#endif
|