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
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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
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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.
40 #include "glimports.h"
43 #include "knotvector.h"
47 #pragma warning 726 10
50 void Knotvector::init( long _knotcount, long _stride, long _order, INREAL *_knotlist )
52 knotcount = _knotcount;
55 knotlist = new Knot[_knotcount];
56 assert( knotlist != 0 );
58 for( int i = 0; i != _knotcount; i++ )
59 knotlist[i] = (Knot) _knotlist[i];
62 Knotvector::Knotvector( void )
70 Knotvector::~Knotvector( void )
72 if( knotlist ) delete[] knotlist;
75 int Knotvector::validate( void )
77 /* kindex is used as an array index so subtract one first,
78 * this propagates throughout the code so study carefully */
79 long kindex = knotcount-1;
81 if( order < 1 || order > MAXORDER ) {
82 // spline order un-supported
86 if( knotcount < (2 * order) ) {
91 if( identical( knotlist[kindex-(order-1)], knotlist[order-1]) ) {
92 // valid knot range is empty
96 for( long i = 0; i < kindex; i++)
97 if( knotlist[i] > knotlist[i+1] ) {
98 // decreasing knot sequence
102 /* check for valid multiplicity */
104 /* kindex is currently the index of the last knot.
105 * In the next loop it is decremented to ignore the last knot
106 * and the loop stops when kindex is 2 so as to ignore the first
107 * knot as well. These knots are not used in computing
108 * knot multiplicities.
112 for( ; kindex >= 1; kindex-- ) {
113 if( knotlist[kindex] - knotlist[kindex-1] < TOLERANCE ) {
117 if ( multi > order ) {
118 // knot multiplicity greater than order of spline
124 if ( multi > order ) {
125 // knot multiplicity greater than order of spline
132 void Knotvector::show( const char *msg )
135 _glu_dprintf( "%s\n", msg );
136 _glu_dprintf( "order = %ld, count = %ld\n", order, knotcount );
138 for( int i=0; i<knotcount; i++ )
139 _glu_dprintf( "knot[%d] = %g\n", i, knotlist[i] );