SoCache.h

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/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */
 
 
/*
 * Copyright (C) 1990,91   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.1.1.1 $
 |
 |   Description:
 |      This file defines the abstract SoCache class, the base class
 |      for all caches in Inventor.
 |
 |   Author(s)          : Paul S. Strauss
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */
 
#ifndef  _SO_CACHE
#define  _SO_CACHE
 
 
#include <Inventor/SoLists.h>
 
class SoElement;
class SoState;
 
SoEXTENDER class INVENTOR_API SoCache {
 
  public:
 
    SoCache(SoState *state);
 
    void                ref();
    void                unref(SoState *state = NULL);
 
    void                addElement(const SoElement *elt);
 
    virtual void        addCacheDependency(const SoState *state,
                                           SoCache *cache);
 
    virtual bool        isValid(const SoState *state) const;
 
    const SoElement *   getInvalidElement(const SoState *state) const;
 
    void                invalidate();
 
  protected:
    virtual void        destroy(SoState *state);
 
    virtual ~SoCache();
 
  private:
    SbPList             elementsUsed;           
    unsigned char       *elementsUsedFlags;     
 
    int                 refCount;               
    int                 invalidated;            
    int                 depth;                  
};
 
#endif /* _SO_CACHE */