/home/cube/sources/osgearth/src/osgEarthDrivers/engine_osgterrain/FileLocationCallback

Go to the documentation of this file.

/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2010 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>
*/

#ifndef OSGEARTH_ENGINE_OSGTERRAIN_FILE_LOCATION_CALLBACK_H
#define OSGEARTH_ENGINE_OSGTERRAIN_FILE_LOCATION_CALLBACK_H 1

#include "OSGTerrainEngineNode"
#include <osg/Version>
#include <osgEarth/Export>


#define USE_FILELOCATIONCALLBACK OSG_MIN_VERSION_REQUIRED(2,9,5)

#if USE_FILELOCATIONCALLBACK

class FileLocationCallback : public osgDB::FileLocationCallback
{
public:
    FileLocationCallback() { }

    virtual Location fileLocation(const std::string& filename, const osgDB::Options* options)
    {
        Location result = REMOTE_FILE;
        //OE_NOTICE<<"fileLocation = "<<filename<<std::endl;

        unsigned int lod, x, y, id;
        sscanf(filename.c_str(), "%d_%d_%d.%d", &lod, &x, &y, &id);

        osg::ref_ptr<OSGTerrainEngineNode> engine;
        OSGTerrainEngineNode::getEngineByUID( (UID)id, engine );

        if ( engine.valid() )
        {
            const osgEarth::Profile* profile = engine->getMap()->getProfile();
            osgEarth::TileKey mapKey( lod, x, y, profile );

            result = LOCAL_FILE;

            MapFrame mapf( engine->getMap() );
            for( unsigned i=0; i<4; ++i )
            {
                TileKey childKey = mapKey.createChildKey( i );
                if ( !mapf.isCached( childKey ) )
                {
                    result = REMOTE_FILE;
                    break;
                }
            }
            //if ( engine->getTileFactory()->areChildrenCached( engine->getMap(), mapKey ) )
            //{
            //    result = LOCAL_FILE;
            //}
        }

        return result;
    }

    virtual bool useFileCache() const { return false; }
};

#endif // USE_FILELOCATIONCALLBACK

#endif //OSGEARTH_ENGINE_OSGTERRAIN_FILE_LOCATION_CALLBACK_H