dll/opengl/glu32/src/libnurbs/internals/knotvector.h

   1 /*
   2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
   3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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  10  * Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice including the dates of first publication and
  13  * either this permission notice or a reference to
  14  * http://oss.sgi.com/projects/FreeB/
  15  * shall be included in all copies or substantial portions of the Software.
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  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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  30
  31 /*
  32  * knotvector.h
  33  *
  34  */
  35
  36 #ifndef __gluknotvector_h_
  37 #define __gluknotvector_h_
  38
  39 #include "types.h"
  40
  41 struct Knotvector { /* a knot vector */
  42                         Knotvector( void );
  43                         ~Knotvector( void );
  44     void                init( long, long, long, INREAL * );
  45     int                 validate( void );
  46     void                show( const char * );
  47
  48     long                order;          /* order of spline  */
  49     long                knotcount;      /* number of knots  */
  50     long                stride;         /* bytes between points */
  51     Knot *              knotlist;       /* global knot vector */
  52 };
  53
  54 /* tolerance to test knot coincidence */
  55 #define TOLERANCE               1.0e-5
  56
  57 inline int
  58 identical( Knot x, Knot y )
  59 {
  60     return ((x-y) < TOLERANCE) ? 1 : 0;
  61 }
  62 #endif /* __gluknotvector_h_ */