xref: /xsrc/external/mit/glu/dist/src/libnurbs/internals/trimvertex.h

/*
 * 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,
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 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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 */

/*
 * trimvertex.h
 *
 */

#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_ */