PatchCache.h

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#ifndef PATCHCACHE_H
#define PATCHCACHE_H

#include "PatchCacheLine.h"

#include <vector>
#include <queue>
class FormFactorEngine;
class PatchRandomAccessEnumerator;

class PatchCache {
  public:
    PatchCache(PatchRandomAccessEnumerator *patchEnumerator, float ffTreshold, long maxCacheSize);
    ~PatchCache();

    Color totalRadiosity(int destPatch);
    
    long int cacheRawSize() const;

  private:
    PatchRandomAccessEnumerator *patchEnumerator_;
    float ffTreshold_;
    long maxCacheSize_;
    size_t patchCount_;
    FormFactorEngine *ffe_;
    
    // Cache container (containing cache-lines)
    typedef std::vector<PatchCacheLine*> TCache;
    TCache *cache_;
    long int cachedItems_;
    
    // Priority queue used to optimize memory usage
    class TQueueItem {
        PatchCacheLine **cl_;
      public:
        TQueueItem(PatchCacheLine **cl): cl_(cl) { }
        // Key of priority queue ordering
        operator int() const {
          return (*cl_)->itemCount();
        }
        // Return reference to pointer to cache-line
        PatchCacheLine*& pCacheLine() const {
          return (*cl_);
        }
    };
    typedef std::priority_queue<TQueueItem> TQueue;
    TQueue *cacheQueue_;
};

#endif // PATCHCACHE_H

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