1 /*
2  * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3  * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4  *
5  * Permission is hereby granted, free of charge, to any person obtaining a
6  * copy of this software and associated documentation files (the "Software"),
7  * to deal in the Software without restriction, including without limitation
8  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9  * and/or sell copies of the Software, and to permit persons to whom the
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.
16  *
17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20  * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21  * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22  * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23  * SOFTWARE.
24  *
25  * Except as contained in this notice, the name of Silicon Graphics, Inc.
26  * shall not be used in advertising or otherwise to promote the sale, use or
27  * other dealings in this Software without prior written authorization from
28  * Silicon Graphics, Inc.
29  */
30 
31 /*
32  * patch.h
33  *
34  */
35 
36 #ifndef __glupatch_h_
37 #define __glupatch_h_
38 
39 #include "types.h"
40 #include "defines.h"
41 
42 class Quilt;
43 class Mapdesc;
44 
45 
46 struct Pspec {
47     REAL		range[3];
48     REAL		sidestep[2];
49     REAL		stepsize;
50     REAL		minstepsize;
51     int			needsSubdivision;
52 };
53 
54 struct Patchspec : public Pspec {
55     int			order;
56     int			stride;
57     void 		clamp( REAL );
58     void 		getstepsize( REAL );
59     void		singleStep( void );
60 };
61 
62 class Patch {
63 public:
64 friend class Subdivider;
65 friend class Quilt;
66 friend class Patchlist;
67     			Patch( Quilt *, REAL*, REAL *, Patch * );
68     			Patch( Patch &, int, REAL, Patch * );
69     void		bbox( void );
70     void		clamp( void );
71     void		getstepsize( void );
72     int			cullCheck( void );
73     int			needsSubdivision( int );
74     int			needsSamplingSubdivision( void );
75     int			needsNonSamplingSubdivision( void );
76 
77     int                 get_uorder() {return pspec[0].order;}
78     int                 get_vorder() {return pspec[1].order;}
79 
80 private:
81 
82     Mapdesc*		mapdesc;
83     Patch*		next;
84     int			cullval;
85     int			notInBbox;
86     int			needsSampling;
87     REAL		cpts[MAXORDER*MAXORDER*MAXCOORDS]; //culling pts
88     REAL		spts[MAXORDER*MAXORDER*MAXCOORDS]; //sampling pts
89     REAL		bpts[MAXORDER*MAXORDER*MAXCOORDS]; //bbox pts
90     Patchspec		pspec[2];
91     void 		checkBboxConstraint( void );
92     REAL 		bb[2][MAXCOORDS];
93 };
94 #endif /* __glupatch_h_ */
95