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 * $Date$ $Revision: 1.1 $
39 * $Header: /cygdrive/c/RCVS/CVS/ReactOS/reactos/lib/glu32/libnurbs/internals/trimregion.cc,v 1.1 2004/02/02 16:39:13 navaraf Exp $
42 #include "glimports.h"
45 #include "trimregion.h"
48 TrimRegion::TrimRegion( void )
53 TrimRegion::setDu( REAL du
)
59 TrimRegion::init( long npts
, Arc_ptr extrema
)
61 left
.init( npts
, extrema
, extrema
->pwlArc
->npts
- 1 );
64 right
.init( npts
, extrema
, 0 );
69 TrimRegion::getPts( Arc_ptr extrema
)
71 left
.getNextPts( extrema
);
72 right
.getPrevPts( extrema
);
76 TrimRegion::getPts( Backend
&backend
)
78 left
.getNextPts( bot
.vval
, backend
);
79 right
.getPrevPts( bot
.vval
, backend
);
83 TrimRegion::getGridExtent( void )
85 getGridExtent( left
.last(), right
.last() );
89 TrimRegion::getGridExtent( TrimVertex
*l
, TrimVertex
*r
)
91 bot
.ustart
= (long) ((l
->param
[0] - uarray
.uarray
[0])*oneOverDu
);
92 if( l
->param
[0] >= uarray
.uarray
[bot
.ustart
] ) bot
.ustart
++;
93 // if( l->param[0] > uarray.uarray[bot.ustart] ) bot.ustart++;
94 assert( l
->param
[0] <= uarray
.uarray
[bot
.ustart
] );
95 assert( l
->param
[0] >= uarray
.uarray
[bot
.ustart
-1] );
97 bot
.uend
= (long) ((r
->param
[0] - uarray
.uarray
[0])*oneOverDu
);
98 if( uarray
.uarray
[bot
.uend
] >= r
->param
[0] ) bot
.uend
--;
99 // if( uarray.uarray[bot.uend] > r->param[0] ) bot.uend--;
100 assert( r
->param
[0] >= uarray
.uarray
[bot
.uend
] );
101 assert( r
->param
[0] <= uarray
.uarray
[bot
.uend
+1] );
105 TrimRegion::canTile( void )
107 TrimVertex
*lf
= left
.first();
108 TrimVertex
*ll
= left
.last();
109 TrimVertex
*l
= ( ll
->param
[0] > lf
->param
[0] ) ? ll
: lf
;
111 TrimVertex
*rf
= right
.first();
112 TrimVertex
*rl
= right
.last();
113 TrimVertex
*r
= ( rl
->param
[0] < rf
->param
[0] ) ? rl
: rf
;
114 return (l
->param
[0] <= r
->param
[0]) ? 1 : 0;