4a609646b6
a newly loaded tile to the scene graph. Instead it puts it in a queue for the tile manager. I've used your counter_hack to check the loaded queue and add any tiles to the scene graph. I was playing around with the counter_hack so there might be some commented out code, etc. I also changed some SG_DEBUGs to SG_INFOs so I could track the tile loading.
141 lines
3.3 KiB
C++
141 lines
3.3 KiB
C++
// FGTileLoader - Queue scenery tiles for loading.
|
|
//
|
|
// Written by Bernie Bright, started March 2001.
|
|
//
|
|
// Copyright (C) 2001 Bernard Bright - bbright@bigpond.net.au
|
|
//
|
|
// This program is free software; you can redistribute it and/or
|
|
// modify it under the terms of the GNU General Public License as
|
|
// published by the Free Software Foundation; either version 2 of the
|
|
// License, or (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful, but
|
|
// WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
// General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU General Public License
|
|
// along with this program; if not, write to the Free Software
|
|
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
//
|
|
// $Id$
|
|
|
|
|
|
#ifndef FG_TILE_LOADER_HXX
|
|
#define FG_TILE_LOADER_HXX
|
|
|
|
#include <simgear/bucket/newbucket.hxx>
|
|
#include <simgear/misc/sg_path.hxx>
|
|
|
|
#ifdef ENABLE_THREADS
|
|
# include <simgear/threads/SGThread.hxx>
|
|
# include <simgear/threads/SGQueue.hxx>
|
|
#endif
|
|
|
|
// Forward reference.
|
|
class FGTileEntry;
|
|
|
|
/**
|
|
* Queues tiles for loading, possibly by a separate thread.
|
|
*/
|
|
class FGTileLoader
|
|
{
|
|
public:
|
|
|
|
/**
|
|
* Constructor.
|
|
*/
|
|
FGTileLoader();
|
|
|
|
/**
|
|
* Destructor.
|
|
*/
|
|
~FGTileLoader();
|
|
|
|
/**
|
|
* Add a tile to the end of the load queue.
|
|
* @param tile The tile to be loaded from disk.
|
|
* @param vis Current visibilty (in feet?) (see FGTileMgr::vis).
|
|
*/
|
|
void add( FGTileEntry* tile );
|
|
|
|
/**
|
|
* The tile loader thread will only load one tile per call to the
|
|
* update() method. This is a way to spread out the work of the
|
|
* tile loader and slow it down so it is less intrusive. For
|
|
* systems built without thead support this is a no-op.
|
|
*/
|
|
void update();
|
|
|
|
/**
|
|
* Returns whether the load queue is empty (contains no elements).
|
|
* @return true if load queue is empty otherwise returns false.
|
|
*/
|
|
// bool empty() const { return tile_queue.empty(); }
|
|
|
|
private:
|
|
|
|
private:
|
|
|
|
/**
|
|
* FIFO queue of tiles to load from data files.
|
|
*/
|
|
SGBlockingQueue< FGTileEntry* > tile_queue;
|
|
|
|
/**
|
|
* Base name of directory containing tile data file.
|
|
*/
|
|
SGPath tile_path;
|
|
|
|
#ifdef ENABLE_THREADS
|
|
/**
|
|
* Maximum number of threads to create for loading tiles.
|
|
*/
|
|
enum { MAX_THREADS = 1 };
|
|
|
|
/**
|
|
* This class represents the thread of execution responsible for
|
|
* loading a tile.
|
|
*/
|
|
class LoaderThread : public SGThread
|
|
{
|
|
public:
|
|
LoaderThread( FGTileLoader* l ) : loader(l) {}
|
|
~LoaderThread() {}
|
|
|
|
/**
|
|
* Reads the tile from disk.
|
|
*/
|
|
void run();
|
|
|
|
private:
|
|
FGTileLoader* loader;
|
|
|
|
private:
|
|
// not implemented.
|
|
LoaderThread();
|
|
LoaderThread( const LoaderThread& );
|
|
LoaderThread& operator=( const LoaderThread& );
|
|
};
|
|
|
|
friend class LoaderThread;
|
|
|
|
/**
|
|
* Array of loading threads.
|
|
*/
|
|
LoaderThread* threads[ MAX_THREADS ];
|
|
|
|
/**
|
|
* Lock and synchronize access to tile queue.
|
|
*/
|
|
SGMutex mutex;
|
|
SGCondition frame_cond;
|
|
|
|
/**
|
|
* Thread cleanup handler.
|
|
*/
|
|
friend void cleanup_handler( void* );
|
|
#endif // ENABLE_THREADS
|
|
};
|
|
|
|
#endif // FG_TILE_LOADER_HXX
|