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OpenGLCache.h

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/***************************************************************************
 *cr
 *cr            (C) Copyright 1995-2019 The Board of Trustees of the
 *cr                        University of Illinois
 *cr                         All Rights Reserved
 *cr
 ***************************************************************************/
/***************************************************************************
 * RCS INFORMATION:
 *
 *      $RCSfile: OpenGLCache.h,v $
 *      $Author: johns $        $Locker:  $             $State: Exp $
 *      $Revision: 1.11 $       $Date: 2020/02/26 06:00:57 $
 *
 ***************************************************************************/
#ifndef OPENGLCACHE_H
#define OPENGLCACHE_H

#include <stdlib.h>
#include "OpenGLExtensions.h"

#define GLCACHE_FAIL 0

class OpenGLCache {
private:
  struct idlink {
    idlink *next;           
    int used;               
    const unsigned long id; 
    const GLuint gltag;     

    idlink(unsigned long theid, GLuint tag, idlink *thenext)
    : next(thenext), used(1), id(theid), gltag(tag) {}
  };

  idlink * cache;           

public:
  OpenGLCache();
  ~OpenGLCache(); 

  void encache(unsigned long id, GLuint tag); 
  void markUnused();                 
  GLuint markUsed(unsigned long id); 
  GLuint deleteUnused();             
};

#endif

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