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 );
}
}
}
void
OSGTerrainEngineNode::updateElevation( Tile* tile )
{
Threading::ScopedWriteLock exclusiveLock( tile->getTileLayersMutex() );
const TileKey& key = tile->getKey();
bool hasElevation = _update_mapf->elevationLayers().size() > 0;
osgTerrain::HeightFieldLayer* heightFieldLayer = dynamic_cast<osgTerrain::HeightFieldLayer*>(tile->getElevationLayer());
if (heightFieldLayer)
{
// In standard mode, just load the elevation data and dirty the tile.
if ( !_isStreaming )
{
osg::ref_ptr<osg::HeightField> hf;
if (hasElevation)
_update_mapf->getHeightField( key, true, hf, 0L);
if (!hf.valid())
hf = OSGTileFactory::createEmptyHeightField( key );
heightFieldLayer->setHeightField( hf.get() );
hf->setSkirtHeight( tile->getBound().radius() * _terrainOptions.heightFieldSkirtRatio().value() );
//TODO: review this in favor of a tile update...
tile->setDirty( true );
}
else // if ( isStreaming )
{
StreamingTile* stile = static_cast<StreamingTile*>(tile);
//Update the elevation hint
stile->setHasElevationHint( hasElevation );
//In seq/pre mode, if there is no elevation, just clear out all the elevation on the tiles
if ( !hasElevation )
{
osg::ref_ptr<osg::HeightField> hf = OSGTileFactory::createEmptyHeightField( key );
heightFieldLayer->setHeightField( hf.get() );
hf->setSkirtHeight( stile->getBound().radius() * _terrainOptions.heightFieldSkirtRatio().value() );
stile->setElevationLOD( key.getLevelOfDetail() );
stile->resetElevationRequests( *_update_mapf );
stile->queueTileUpdate( TileUpdate::UPDATE_ELEVATION );
}
else
{
//Always load the first LOD so the children tiles can have something to use for placeholders
if (stile->getKey().getLevelOfDetail() == 1)
{
osg::ref_ptr<osg::HeightField> hf;
_update_mapf->getHeightField( key, true, hf, 0L);
if (!hf.valid())
hf = OSGTileFactory::createEmptyHeightField( key );
heightFieldLayer->setHeightField( hf.get() );
hf->setSkirtHeight( stile->getBound().radius() * _terrainOptions.heightFieldSkirtRatio().value() );
stile->setElevationLOD(tile->getKey().getLevelOfDetail());
stile->queueTileUpdate( TileUpdate::UPDATE_ELEVATION );
}
else
{
//Set the elevation LOD to -1
stile->setElevationLOD(-1);
stile->resetElevationRequests( *_update_mapf );
}
}
}
}
}
