void
StreamingTerrainNode::updateTraversal( osg::NodeVisitor& nv )
{
// this stamp keeps track of when requests are dispatched. If a request's stamp gets too
// old, it is considered "expired" and subject to cancelation
int stamp = nv.getFrameStamp()->getFrameNumber();
// update the frame stamp on the task services. This is necessary to support
// automatic request cancelation for image requests.
{
ScopedLock<Mutex> lock( _taskServiceMutex );
for (TaskServiceMap::iterator i = _taskServices.begin(); i != _taskServices.end(); ++i)
{
i->second->setStamp( stamp );
}
}
// next, go through the live tiles and process update-traversal requests. This
// requires a read-lock on the master tiles table.
{
Threading::ScopedReadLock tileTableReadLock( _tilesMutex );
for( TileTable::const_iterator i = _tiles.begin(); i != _tiles.end(); ++i )
{
StreamingTile* tile = static_cast<StreamingTile*>( i->second.get() );
// update the neighbor list for each tile.
refreshFamily( _update_mapf.getMapInfo(), tile->getKey(), tile->getFamily(), true );
tile->servicePendingElevationRequests( _update_mapf, stamp, true );
tile->serviceCompletedRequests( _update_mapf, true );
}
}
}
