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      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 
     43 class BasicCurveEvaluator;
     44 class BasicSurfaceEvaluator;
     45 
     46 class Backend {
     47 private:
     48     BasicCurveEvaluator&	curveEvaluator;
     49     BasicSurfaceEvaluator&	surfaceEvaluator;
     50 public:
     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 );
    103 private:
    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