patch.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)
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/*
 * patch.h
 *
 * $Date: 2001/03/17 00:25:41 $ $Revision: 1.1 $
 * $Header: /home/krh/git/sync/mesa-cvs-repo/Mesa/src/glu/sgi/libnurbs/internals/patch.h,v 1.1 2001/03/17 00:25:41 brianp Exp $
 */

#ifndef __glupatch_h_
#define __glupatch_h_

#include "types.h"
#include "defines.h"

class Quilt;
class Mapdesc;


struct Pspec {
    REAL		range[3];
    REAL		sidestep[2];
    REAL		stepsize;
    REAL		minstepsize;
    int			needsSubdivision;
};

struct Patchspec : public Pspec {
    int			order;
    int			stride;
    void 		clamp( REAL );
    void 		getstepsize( REAL );
    void		singleStep( void );    
};

class Patch {
public:
friend class Subdivider;
friend class Quilt;
friend class Patchlist;
    			Patch( Quilt *, REAL*, REAL *, Patch * );
    			Patch( Patch &, int, REAL, Patch * );
    void		bbox( void );
    void		clamp( void );
    void		getstepsize( void );
    int			cullCheck( void );
    int			needsSubdivision( int );
    int			needsSamplingSubdivision( void );
    int			needsNonSamplingSubdivision( void );

    int                 get_uorder() {return pspec[0].order;}
    int                 get_vorder() {return pspec[1].order;}

private:

    Mapdesc*		mapdesc;
    Patch*		next;
    int			cullval;
    int			notInBbox;
    int			needsSampling;
    REAL		cpts[MAXORDER*MAXORDER*MAXCOORDS]; //culling pts 
    REAL		spts[MAXORDER*MAXORDER*MAXCOORDS]; //sampling pts 
    REAL		bpts[MAXORDER*MAXORDER*MAXCOORDS]; //bbox pts
    Patchspec		pspec[2];
    void 		checkBboxConstraint( void );
    REAL 		bb[2][MAXCOORDS];
};
#endif /* __glupatch_h_ */