backend.h

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/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice including the dates of first publication and
 * either this permission notice or a reference to
 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
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 */

/*
 * backend.h
 *
 */

#ifndef __glubackend_h_
#define __glubackend_h_

//#include "trimvertex.h"
//#include "gridvertex.h"
#include "gridtrimvertex.h"

class BasicCurveEvaluator;
class BasicSurfaceEvaluator;

class Backend {
private:
    BasicCurveEvaluator&    curveEvaluator;
    BasicSurfaceEvaluator&  surfaceEvaluator;
public:
            Backend( BasicCurveEvaluator &c, BasicSurfaceEvaluator& e )
            : curveEvaluator(c), surfaceEvaluator(e) {}

    /* surface backend routines */
    void        bgnsurf( int, int, long  );
    void        patch( REAL, REAL, REAL, REAL );
    void        surfpts( long, REAL *, long, long, int, int,
                     REAL, REAL, REAL, REAL );
    void        surfbbox( long, REAL *, REAL * );
    void        surfgrid( REAL, REAL, long, REAL, REAL, long ); 
    void        surfmesh( long, long, long, long ); 
    void        bgntmesh( const char * );
    void        endtmesh( void );
    void        swaptmesh( void );
    void        tmeshvert( GridTrimVertex * );
    void        tmeshvert( TrimVertex * );
    void        tmeshvert( GridVertex * );
    void        tmeshvert( REAL u,  REAL v );
    void        linevert( TrimVertex * );
    void        linevert( GridVertex * );
    void        bgnoutline( void );
    void        endoutline( void );
    void        endsurf( void );
    void        triangle( TrimVertex*, TrimVertex*, TrimVertex* );

    void                bgntfan();
    void                endtfan();
    void                bgnqstrip();
    void                endqstrip();
    void                evalUStrip(int n_upper, REAL v_upper, REAL* upper_val, 
                   int n_lower, REAL v_lower, REAL* lower_val
                   );
    void                evalVStrip(int n_left, REAL u_left, REAL* left_val, 
                   int n_right, REAL v_right, REAL* right_val
                   );
    void                tmeshvertNOGE(TrimVertex *t);
    void                tmeshvertNOGE_BU(TrimVertex *t);
    void                tmeshvertNOGE_BV(TrimVertex *t);
    void                preEvaluateBU(REAL u);
    void                preEvaluateBV(REAL v);
    

    /* curve backend routines */
    void        bgncurv( void );
    void        segment( REAL, REAL );
    void        curvpts( long, REAL *, long, int, REAL, REAL );
    void        curvgrid( REAL, REAL, long );
    void        curvmesh( long, long );
    void        curvpt( REAL  );  
    void        bgnline( void );
    void        endline( void );
    void        endcurv( void );
private:
#ifndef NOWIREFRAME
    int         wireframetris;
    int         wireframequads;
    int         npts;
    REAL        mesh[3][4];
    int         meshindex;
#endif
};

#endif /* __glubackend_h_ */