const osgDB::ReaderWriter::Options* options);
/**
- * this value is used by the tile scheduler/loader to mark which
- * tiles are in the primary ring (i.e. the current tile or the
- * surrounding eight.) Other routines then can use this as an
- * optimization and not do some operation to tiles outside of this
- * inner ring. (For instance vasi color updating)
+ * This value is used by the tile scheduler/loader to load tiles
+ * in a useful sequence. The priority is set to reflect the tiles
+ * distance from the center, so all tiles are loaded in an innermost
+ * to outermost sequence.
*/
- bool is_inner_ring;
+ float _priority;
+ /** Flag indicating if tile belongs to current view. */
+ bool _current_view;
+ /** Time when tile expires. */
+ double _time_expired;
static ModelLoadHelper *_modelLoader;
*/
osg::LOD *getNode() const { return _node.get(); }
- double get_timestamp() const;
- void set_timestamp( double time_ms );
+ inline double get_time_expired() const { return _time_expired; }
+ inline void update_time_expired( double time_expired ) { if (_time_expired<time_expired) _time_expired = time_expired; }
- inline bool get_inner_ring() const { return is_inner_ring; }
- inline void set_inner_ring( bool val ) { is_inner_ring = val; }
+ inline void set_priority(float priority) { _priority=priority; }
+ inline float get_priority() const { return _priority; }
+ inline void set_current_view(bool current_view) { _current_view = current_view; }
+ inline bool is_current_view() const { return _current_view; }
+
+ /**
+ * Return true if the tile entry is still needed, otherwise return false
+ * indicating that the tile is no longer in active use.
+ */
+ inline bool is_expired(double current_time) const { return (_current_view) ? false : (current_time > _time_expired); }
// Get the ref_ptr to the DatabaseRequest object, in order to pass
// this to the pager.