Inventor/caches/SoCpuBufferObjectCache.h

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/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/

#ifndef _SO_BUFFER_OBJECT_CACHE_H_
#define _SO_BUFFER_OBJECT_CACHE_H_

#include <Inventor/SbBase.h>
#include <Inventor/STL/map>
#include <Inventor/STL/list>

class SoBufferObject;
class SoCpuBufferObject;
class SbThreadSpinlock;

#ifdef _WIN32
#pragma warning( push )
#pragma warning(disable:4251)
#endif

class  SoCpuBufferObjectCache
{
 public:
   
  virtual void flush();

  virtual void resize( const size_t newSize );

  virtual size_t getSize( );

 private:
  SoCpuBufferObjectCache();

  virtual ~SoCpuBufferObjectCache();
  
  virtual SoCpuBufferObject* getBufferRef( const uint64_t bufferId );

  virtual uint64_t addInCache( SoCpuBufferObject* bufferObject );

  virtual bool releaseBufferRef ( const uint64_t bufferId );

  SoCpuBufferObject* getBuffer(const uint64_t bufferId);

private:

  // internal perf counters access
  void getInternalCounter(  uint64_t &nbCacheAccess, uint64_t& nbCacheDefault);
  void resetInternalCounter( );

  // Force a delete from cache (mainly used as a double checked in SoCpuBufferCache destructor
  // costly because we have to search for the bufferId first.
  virtual bool deleteFromCache( const uint64_t bufferId );

  // Retrieve bufferId from its signature. 
  uint64_t getMappingIdfromSig(const uint64_t& cacheSig);

private:

  // implementation of getBuffer for getBuffer and getBufferRef
  // notes it is upd to the caller to lock the cacheList mutex
  SoCpuBufferObject* getBufferInternal(const uint64_t bufferId);

  // internal cache management
  typedef std::map<uint64_t, SoCpuBufferObject*> cacheListType;
  typedef std::map<uint64_t, uint64_t> bufferSignatureMap;
  typedef std::list<uint64_t> lruBufferIdsType;

  cacheListType m_cacheList;
  bufferSignatureMap m_bufferIdToSigMap;
  bufferSignatureMap m_bufferSigToIdMap;
  // List of sorted ids. The last one is the last used one.
  lruBufferIdsType lruBufferIds;

  // Max size of the cache
  size_t m_maxCacheSize;

  // Uniq Id management
  uint64_t getUniqueId();
  uint64_t m_lasUniqId;

  // Remove the least recently used buffer.
  void makeRoomInCache();
  
  // Spinlock used to protect cache access
  SbThreadSpinlock *m_cacheListLock;

  // perf counter manager
  uint64_t m_perfNbCacheAccess ;
  uint64_t m_perfNbCacheDefault;
};

#ifdef WIN32
#pragma warning( pop )
#endif

#endif //_SO_BUFFER_OBJECT_CACHE_H_

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Open Inventor Toolkit reference manual, generated on 12 Feb 2024
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