142 lines
3.9 KiB
C++
142 lines
3.9 KiB
C++
// newcache.hxx -- routines to handle scenery tile caching
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//
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// Written by Curtis Olson, started December 2000.
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//
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// Copyright (C) 2000 Curtis L. Olson - curt@flightgear.org
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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#ifndef _NEWCACHE_HXX
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#define _NEWCACHE_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#include <GL/glut.h>
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#include <map>
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#include <simgear/bucket/newbucket.hxx>
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#include <simgear/math/point3d.hxx>
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#include "tileentry.hxx"
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SG_USING_STD(map);
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// A class to store and manage a pile of tiles
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class FGNewCache {
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typedef map < long, FGTileEntry * > tile_map;
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typedef tile_map::iterator tile_map_iterator;
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typedef tile_map::const_iterator const_tile_map_iterator;
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// cache storage space
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tile_map tile_cache;
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// maximum cache size
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int max_cache_size;
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// pointers to allow an external linear traversal of cache entries
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tile_map_iterator current;
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// Free a tile cache entry
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void entry_free( long cache_index );
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public:
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// Constructor
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FGNewCache();
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// Destructor
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~FGNewCache();
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// Initialize the tile cache subsystem
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void init( void );
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// Check if the specified "bucket" exists in the cache
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bool exists( const SGBucket& b ) const;
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// Ensure at least one entry is free in the cache
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bool make_space();
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// Return the index of the oldest tile in the cache, return -1 if
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// nothing available to be removed.
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long get_oldest_tile();
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// Clear a cache entry, note that the cache only holds pointers
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// and this does not free the object which is pointed to.
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void clear_entry( long cache_entry );
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// Clear all completely loaded tiles (ignores partially loaded tiles)
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void clear_cache();
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// Fill in a tile cache entry with real data for the specified bucket
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// void fill_in( const SGBucket& b );
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// Return a pointer to the specified tile cache entry
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inline FGTileEntry *get_tile( const long tile_index ) {
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tile_map_iterator it = tile_cache.find( tile_index );
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if ( it != tile_cache.end() ) {
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it->second->set_timestamp(globals->get_sim_time_sec());
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return it->second;
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} else {
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return NULL;
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}
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}
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// Return a pointer to the specified tile cache entry
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inline FGTileEntry *get_tile( const SGBucket& b ) {
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return get_tile( b.gen_index() );
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}
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// Return the cache size
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inline size_t get_size() const { return tile_cache.size(); }
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// External linear traversal of cache
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inline void reset_traversal() { current = tile_cache.begin(); }
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inline bool at_end() { return current == tile_cache.end(); }
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inline FGTileEntry *get_current() {
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// cout << "index = " << current->first << endl;
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return current->second;
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}
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inline void next() { ++current; }
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inline int get_max_cache_size() const { return max_cache_size; }
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inline void set_max_cache_size( int m ) { max_cache_size = m; }
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/**
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* Create a new tile and enqueue it for loading.
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* @param b
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* @return success/failure
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*/
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bool insert_tile( FGTileEntry* e );
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};
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#endif // _NEWCACHE_HXX
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