source: trunk/src/opengl/glu/tess/geom.h

Last change on this file was 2689, checked in by jeroen, 26 years ago

* empty log message *
File size: 4.0 KB
Line 
1/* $Id: geom.h,v 1.1 2000-02-09 08:47:34 jeroen Exp $ */
2/*
3** License Applicability. Except to the extent portions of this file are
4** made subject to an alternative license as permitted in the SGI Free
5** Software License B, Version 1.0 (the "License"), the contents of this
6** file are subject only to the provisions of the License. You may not use
7** this file except in compliance with the License. You may obtain a copy
8** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
9** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
10**
11** http://oss.sgi.com/projects/FreeB
12**
13** Note that, as provided in the License, the Software is distributed on an
14** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
15** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
16** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
17** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
18**
19** Original Code. The Original Code is: OpenGL Sample Implementation,
20** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
21** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
22** Copyright in any portions created by third parties is as indicated
23** elsewhere herein. All Rights Reserved.
24**
25** Additional Notice Provisions: The application programming interfaces
26** established by SGI in conjunction with the Original Code are The
27** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
28** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
29** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
30** Window System(R) (Version 1.3), released October 19, 1998. This software
31** was created using the OpenGL(R) version 1.2.1 Sample Implementation
32** published by SGI, but has not been independently verified as being
33** compliant with the OpenGL(R) version 1.2.1 Specification.
34**
35*/
36/*
37** Author: Eric Veach, July 1994.
38**
39** $Date: 2000-02-09 08:47:34 $ $Revision: 1.1 $
40** $Header: /home/ktk/tmp/odin/2007/netlabs.cvs/odin32/src/opengl/glu/tess/geom.h,v 1.1 2000-02-09 08:47:34 jeroen Exp $
41*/
42
43#ifndef __geom_h_
44#define __geom_h_
45
46#include "mesh.h"
47
48#ifdef NO_BRANCH_CONDITIONS
49/* MIPS architecture has special instructions to evaluate boolean
50 * conditions -- more efficient than branching, IF you can get the
51 * compiler to generate the right instructions (SGI compiler doesn't)
52 */
53#define VertEq(u,v) (((u)->s == (v)->s) & ((u)->t == (v)->t))
54#define VertLeq(u,v) (((u)->s < (v)->s) | \
55 ((u)->s == (v)->s & (u)->t <= (v)->t))
56#else
57#define VertEq(u,v) ((u)->s == (v)->s && (u)->t == (v)->t)
58#define VertLeq(u,v) (((u)->s < (v)->s) || \
59 ((u)->s == (v)->s && (u)->t <= (v)->t))
60#endif
61
62#define EdgeEval(u,v,w) __gl_edgeEval(u,v,w)
63#define EdgeSign(u,v,w) __gl_edgeSign(u,v,w)
64
65/* Versions of VertLeq, EdgeSign, EdgeEval with s and t transposed. */
66
67#define TransLeq(u,v) (((u)->t < (v)->t) || \
68 ((u)->t == (v)->t && (u)->s <= (v)->s))
69#define TransEval(u,v,w) __gl_transEval(u,v,w)
70#define TransSign(u,v,w) __gl_transSign(u,v,w)
71
72
73#define EdgeGoesLeft(e) VertLeq( (e)->Dst, (e)->Org )
74#define EdgeGoesRight(e) VertLeq( (e)->Org, (e)->Dst )
75
76#define ABS(x) ((x) < 0 ? -(x) : (x))
77#define VertL1dist(u,v) (ABS(u->s - v->s) + ABS(u->t - v->t))
78
79#define VertCCW(u,v,w) __gl_vertCCW(u,v,w)
80
81int __gl_vertLeq( GLUvertex *u, GLUvertex *v );
82GLdouble __gl_edgeEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
83GLdouble __gl_edgeSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
84GLdouble __gl_transEval( GLUvertex *u, GLUvertex *v, GLUvertex *w );
85GLdouble __gl_transSign( GLUvertex *u, GLUvertex *v, GLUvertex *w );
86int __gl_vertCCW( GLUvertex *u, GLUvertex *v, GLUvertex *w );
87void __gl_edgeIntersect( GLUvertex *o1, GLUvertex *d1,
88 GLUvertex *o2, GLUvertex *d2,
89 GLUvertex *v );
90
91#endif
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