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+// tilemgr.hxx -- routines to handle dynamic management of scenery tiles
+//
+// Written by Curtis Olson, started January 1998.
+//
+// Copyright (C) 1997  Curtis L. Olson  - http://www.flightgear.org/~curt
+//
+// 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+// $Id$
+
+
+#ifndef _TILEMGR_HXX
+#define _TILEMGR_HXX
+
+#include <simgear/compiler.h>
+
+#include <simgear/bucket/newbucket.hxx>
+#include "SceneryPager.hxx"
+#include "tilecache.hxx"
+
+namespace osg
+{
+class Node;
+}
+
+namespace simgear
+{
+class SGReaderWriterOptions;
+}
+
+class FGTileMgr {
+
+private:
+
+    // Tile loading state
+    enum load_state {
+        Start = 0,
+        Inited = 1,
+        Running = 2
+    };
+
+    load_state state, last_state;
+
+    // schedule a tile for loading, returns true when tile is already loaded
+    bool sched_tile( const SGBucket& b, double priority,bool current_view, double request_time);
+
+    // schedule a needed buckets for loading
+    void schedule_needed(const SGBucket& curr_bucket, double rangeM);
+
+    bool isTileDirSyncing(const std::string& tileFileName) const;
+    
+    SGBucket previous_bucket;
+    SGBucket current_bucket;
+    SGBucket pending;
+    osg::ref_ptr<simgear::SGReaderWriterOptions> _options;
+
+    double scheduled_visibility;
+
+    /**
+     * tile cache
+     */
+    TileCache tile_cache;
+    
+    class TileManagerListener;
+    friend class TileManagerListener;
+    std::unique_ptr<TileManagerListener> _listener;
+
+    // update various queues internal queues
+    void update_queues(bool& isDownloadingScenery);
+
+    // schedule tiles for the viewer bucket
+    void schedule_tiles_at(const SGGeod& location, double rangeM);
+
+    SGPropertyNode_ptr _visibilityMeters;
+    SGPropertyNode_ptr _lodDetailed, _lodRoughDelta, _lodBareDelta, _disableNasalHooks;
+    SGPropertyNode_ptr _scenery_loaded, _scenery_override;
+
+    osg::ref_ptr<flightgear::SceneryPager> _pager;
+
+    /// is caching of expired tiles enabled or not?
+    bool _enableCache;    
+    bool _use_vpb;
+public:
+    FGTileMgr();
+    ~FGTileMgr();
+
+    // Initialize the Tile Manager
+    void init();
+    void reinit();
+    void shutdown();
+    void update(double dt);
+
+    const SGBucket& get_current_bucket () const { return current_bucket; }
+
+    // Returns true if scenery is available for the given lat, lon position
+    // within a range of range_m.
+    // lat and lon are expected to be in degrees.
+    bool schedule_scenery(const SGGeod& position, double range_m, double duration=0.0);
+
+    // Returns true if tiles around current view position have been loaded
+    bool isSceneryLoaded();
+    
+    // notify the tile manahger the material library was reloaded,
+    // so it can pass this through to its options object
+    void materialLibChanged();
+};
+
+#endif // _TILEMGR_HXX