2 ** License Applicability. Except to the extent portions of this file are
3 ** made subject to an alternative license as permitted in the SGI Free
4 ** Software License B, Version 1.1 (the "License"), the contents of this
5 ** file are subject only to the provisions of the License. You may not use
6 ** this file except in compliance with the License. You may obtain a copy
7 ** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
8 ** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
10 ** http://oss.sgi.com/projects/FreeB
12 ** Note that, as provided in the License, the Software is distributed on an
13 ** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
14 ** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
15 ** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
16 ** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
18 ** Original Code. The Original Code is: OpenGL Sample Implementation,
19 ** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
20 ** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
21 ** Copyright in any portions created by third parties is as indicated
22 ** elsewhere herein. All Rights Reserved.
24 ** Additional Notice Provisions: The application programming interfaces
25 ** established by SGI in conjunction with the Original Code are The
26 ** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
27 ** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
28 ** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
29 ** Window System(R) (Version 1.3), released October 19, 1998. This software
30 ** was created using the OpenGL(R) version 1.2.1 Sample Implementation
31 ** published by SGI, but has not been independently verified as being
32 ** compliant with the OpenGL(R) version 1.2.1 Specification.
38 * $Date: 2003/10/14 23:48:57 $ $Revision: 1.2 $
39 * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/knotvector.cc,v 1.2 2003/10/14 23:48:57 kendallb Exp $
42 #include "glimports.h"
45 #include "knotvector.h"
49 #pragma warning 726 10
52 void Knotvector::init( long _knotcount
, long _stride
, long _order
, INREAL
*_knotlist
)
54 knotcount
= _knotcount
;
57 knotlist
= new Knot
[_knotcount
];
58 assert( knotlist
!= 0 );
60 for( int i
= 0; i
!= _knotcount
; i
++ )
61 knotlist
[i
] = (Knot
) _knotlist
[i
];
64 Knotvector::Knotvector( void )
69 Knotvector::~Knotvector( void )
71 if( knotlist
) delete[] knotlist
;
74 int Knotvector::validate( void )
76 /* kindex is used as an array index so subtract one first,
77 * this propagates throughout the code so study carefully */
78 long kindex
= knotcount
-1;
80 if( order
< 1 || order
> MAXORDER
) {
81 // spline order un-supported
85 if( knotcount
< (2 * order
) ) {
90 if( identical( knotlist
[kindex
-(order
-1)], knotlist
[order
-1]) ) {
91 // valid knot range is empty
95 for( long i
= 0; i
< kindex
; i
++)
96 if( knotlist
[i
] > knotlist
[i
+1] ) {
97 // decreasing knot sequence
101 /* check for valid multiplicity */
103 /* kindex is currently the index of the last knot.
104 * In the next loop it is decremented to ignore the last knot
105 * and the loop stops when kindex is 2 so as to ignore the first
106 * knot as well. These knots are not used in computing
107 * knot multiplicities.
111 for( ; kindex
>= 1; kindex
-- ) {
112 if( knotlist
[kindex
] - knotlist
[kindex
-1] < TOLERANCE
) {
116 if ( multi
> order
) {
117 // knot multiplicity greater than order of spline
123 if ( multi
> order
) {
124 // knot multiplicity greater than order of spline
131 void Knotvector::show( char *msg
)
134 dprintf( "%s\n", msg
);
135 dprintf( "order = %ld, count = %ld\n", order
, knotcount
);
137 for( int i
=0; i
<knotcount
; i
++ )
138 dprintf( "knot[%d] = %g\n", i
, knotlist
[i
] );