backend.h

Mesa is an open-source implementation of the OpenGL specification - a system for rendering interacti

/*
 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
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 * 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.
 *
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/*
 * backend.h
 *
 * $Date: 2001/03/17 00:25:40 $ $Revision: 1.1 $
 * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/backend.h,v 1.1 2001/03/17 00:25:40 brianp Exp $
 */

#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_ */