patch.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.
 *
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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
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 * http://oss.sgi.com/projects/FreeB/
 * shall be included in all copies or substantial portions of the Software.
 *
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 */

/*
 * patch.h
 *
 */

#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_ */