/*
** 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.
*/

/*
 * trimvertex.h
 *
 * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
 * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/trimvertex.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
 */

#ifndef __glutrimvertex_h_
#define __glutrimvertex_h_

#include "types.h"

/*#define USE_OPTTT*/

class TrimVertex { /* a vertex on a trim curve */
public:
    REAL		param[2];	/* parametric space coords */
#ifdef USE_OPTTT
    REAL                cache_point[4]; //only when USE_OPTTT is on in slicer.c++
    REAL                cache_normal[3];
#endif
    long		nuid;
};

typedef class TrimVertex *TrimVertex_p;

inline REAL  
det3( TrimVertex *a, TrimVertex *b, TrimVertex *c ) 
{         
    return a->param[0] * (b->param[1]-c->param[1]) + 
	   b->param[0] * (c->param[1]-a->param[1]) + 
	   c->param[0] * (a->param[1]-b->param[1]);
}

#endif /* __glutrimvertex_h_ */