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/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
**
*/
/*
** 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
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