xref: /xsrc/external/mit/glu/dist/src/libnurbs/internals/knotvector.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,
 * 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.
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 */

/*
 * knotvector.h
 *
 */

#ifndef __gluknotvector_h_
#define __gluknotvector_h_

#include "types.h"

struct Knotvector { /* a knot vector */
			Knotvector( void );
			~Knotvector( void );
    void		init( long, long, long, INREAL * );
    int			validate( void );
    void 		show( const char * );

    long		order;		/* order of spline  */
    long		knotcount;	/* number of knots  */
    long		stride;		/* bytes between points */
    Knot *		knotlist;	/* global knot vector */
};

/* tolerance to test knot coincidence */
#define TOLERANCE 		1.0e-5

inline int
identical( Knot x, Knot y )
{
    return ((x-y) < TOLERANCE) ? 1 : 0;
}
#endif /* __gluknotvector_h_ */