103 lines
3.4 KiB
C++
103 lines
3.4 KiB
C++
// Filename: geomCacheManager.h
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// Created by: drose (11Mar05)
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//
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////////////////////////////////////////////////////////////////////
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//
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// PANDA 3D SOFTWARE
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// Copyright (c) 2001 - 2004, Disney Enterprises, Inc. All rights reserved
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//
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// All use of this software is subject to the terms of the Panda 3d
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// Software license. You should have received a copy of this license
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// along with this source code; you will also find a current copy of
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// the license at http://etc.cmu.edu/panda3d/docs/license/ .
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//
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// To contact the maintainers of this program write to
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// panda3d-general@lists.sourceforge.net .
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//
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////////////////////////////////////////////////////////////////////
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#ifndef GEOMCACHEMANAGER_H
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#define GEOMCACHEMANAGER_H
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#include "pandabase.h"
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#include "config_gobj.h"
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#include "pmutex.h"
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#include "pStatCollector.h"
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class GeomCacheEntry;
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////////////////////////////////////////////////////////////////////
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// Class : GeomCacheManager
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// Description : This is used to keep track of, and limit the size of,
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// the cache of munged vertices, which would otherwise
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// be distributed through all of the GeomVertexData
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// objects in the system.
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//
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// The actual data in the cache is not stored here, but
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// rather it is distributed among the various
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// GeomVertexData source objects. This allows the cache
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// data to propagate through the multiprocess pipeline.
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//
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// This structure actually caches any of a number of
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// different types of pointers, and mixes them all up in
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// the same LRU cache list. Some of them (such as
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// GeomMunger) are reference-counted here in the cache;
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// most are not.
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////////////////////////////////////////////////////////////////////
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class EXPCL_PANDA GeomCacheManager {
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protected:
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GeomCacheManager();
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~GeomCacheManager();
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PUBLISHED:
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INLINE void set_max_size(int max_size) const;
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INLINE int get_max_size() const;
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INLINE int get_total_size() const;
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void flush();
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static GeomCacheManager *get_global_ptr();
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public:
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INLINE void evict_old_entries();
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void evict_old_entries(int max_size, bool keep_current);
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INLINE static void flush_level();
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private:
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// This mutex protects all operations on this object, especially the
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// linked-list operations.
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Mutex _lock;
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int _total_size;
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// We maintain a doubly-linked list to keep the cache entries in
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// least-recently-used order: the items at the head of the list are
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// ready to be flushed. We use our own doubly-linked list instead
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// of an STL list, just so we can avoid a tiny bit of overhead,
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// especially in keeping the pointer directly into the list from the
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// calling objects.
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// The tail and the head of the list are both kept by the _prev and
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// _next pointers, respectively, within the following object, which
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// always exists solely to keep a handle to the list. Keeping a
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// token of the list this way avoids special cases for an empty
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// list.
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GeomCacheEntry *_list;
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static GeomCacheManager *_global_ptr;
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public:
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static PStatCollector _geom_cache_size_pcollector;
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static PStatCollector _geom_cache_active_pcollector;
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static PStatCollector _geom_cache_record_pcollector;
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static PStatCollector _geom_cache_erase_pcollector;
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static PStatCollector _geom_cache_evict_pcollector;
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friend class GeomCacheEntry;
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};
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#include "geomCacheManager.I"
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#endif
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