backend.h revision f220fa62 
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 * backend.h
33 *
34 */
35
36#ifndef __glubackend_h_
37#define __glubackend_h_
38
39#include "trimvertex.h"
40#include "gridvertex.h"
41#include "gridtrimvertex.h"
42
43class BasicCurveEvaluator;
44class BasicSurfaceEvaluator;
45
46class Backend {
47private:
48    BasicCurveEvaluator&	curveEvaluator;
49    BasicSurfaceEvaluator&	surfaceEvaluator;
50public:
51  			Backend( BasicCurveEvaluator &c, BasicSurfaceEvaluator& e )
52			: curveEvaluator(c), surfaceEvaluator(e) {}
53
54    /* surface backend routines */
55    void		bgnsurf( int, int, long  );
56    void		patch( REAL, REAL, REAL, REAL );
57    void		surfpts( long, REAL *, long, long, int, int,
58          			 REAL, REAL, REAL, REAL );
59    void		surfbbox( long, REAL *, REAL * );
60    void		surfgrid( REAL, REAL, long, REAL, REAL, long );
61    void		surfmesh( long, long, long, long );
62    void		bgntmesh( const char * );
63    void		endtmesh( void );
64    void		swaptmesh( void );
65    void		tmeshvert( GridTrimVertex * );
66    void		tmeshvert( TrimVertex * );
67    void		tmeshvert( GridVertex * );
68    void		tmeshvert( REAL u,  REAL v );
69    void		linevert( TrimVertex * );
70    void		linevert( GridVertex * );
71    void		bgnoutline( void );
72    void		endoutline( void );
73    void		endsurf( void );
74    void		triangle( TrimVertex*, TrimVertex*, TrimVertex* );
75
76    void                bgntfan();
77    void                endtfan();
78    void                bgnqstrip();
79    void                endqstrip();
80    void                evalUStrip(int n_upper, REAL v_upper, REAL* upper_val,
81				   int n_lower, REAL v_lower, REAL* lower_val
82				   );
83    void                evalVStrip(int n_left, REAL u_left, REAL* left_val,
84				   int n_right, REAL v_right, REAL* right_val
85				   );
86    void                tmeshvertNOGE(TrimVertex *t);
87    void                tmeshvertNOGE_BU(TrimVertex *t);
88    void                tmeshvertNOGE_BV(TrimVertex *t);
89    void                preEvaluateBU(REAL u);
90    void                preEvaluateBV(REAL v);
91
92
93    /* curve backend routines */
94    void		bgncurv( void );
95    void		segment( REAL, REAL );
96    void		curvpts( long, REAL *, long, int, REAL, REAL );
97    void		curvgrid( REAL, REAL, long );
98    void		curvmesh( long, long );
99    void		curvpt( REAL  );
100    void		bgnline( void );
101    void		endline( void );
102    void		endcurv( void );
103private:
104#ifndef NOWIREFRAME
105    int			wireframetris;
106    int			wireframequads;
107    int			npts;
108    REAL		mesh[3][4];
109    int			meshindex;
110#endif
111};
112
113#endif /* __glubackend_h_ */
114