1 // FGTileLoader - Queue scenery tiles for loading.
3 // Written by Bernie Bright, started March 2001.
5 // Copyright (C) 2001 Bernard Bright - bbright@bigpond.net.au
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #ifndef FG_TILE_LOADER_HXX
25 #define FG_TILE_LOADER_HXX
30 #include <simgear/bucket/newbucket.hxx>
31 #include <simgear/misc/sg_path.hxx>
34 # include <simgear/threads/SGThread.hxx>
41 * Queues tiles for loading, possibly by a separate thread.
58 * Add a tile to the end of the load queue.
59 * @param tile The tile to be loaded from disk.
60 * @param vis Current visibilty (in feet?) (see FGTileMgr::vis).
62 void add( FGTileEntry* tile );
65 * Returns whether the load queue is empty (contains no elements).
66 * @return true if load queue is empty otherwise returns false.
68 bool empty() const { return tile_queue.empty(); }
75 * FIFO queue of tiles to load from data files.
77 std::queue< FGTileEntry* > tile_queue;
80 * Base name of directory containing tile data file.
86 * Maximum number of threads to create for loading tiles.
88 enum { MAX_THREADS = 1 };
91 * This class represents the thread of execution responsible for
94 class LoaderThread : public SGThread
97 LoaderThread( FGTileLoader* l ) : loader(l) {}
101 * Reads the tile from disk.
106 FGTileLoader* loader;
111 LoaderThread( const LoaderThread& );
112 LoaderThread& operator=( const LoaderThread& );
115 friend class LoaderThread;
118 * Array of loading threads.
120 LoaderThread* threads[ MAX_THREADS ];
123 * Lock and synchronize access to tile queue.
129 * Thread cleanup handler.
131 friend void cleanup_handler( void* );
132 #endif // ENABLE_THREADS
135 #endif // FG_TILE_LOADER_HXX