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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2008-2013 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_TRAVERSAL_DATA_H
#define OSGEARTH_TRAVERSAL_DATA_H 1

#include <osgEarth/Common>
#include <osgEarth/ThreadingUtils>
#include <osg/NodeVisitor>
#include <osg/observer_ptr>
#include <map>

namespace osgEarth
{
    class MapNode;

    class TraversalData : public osg::Referenced
    {
    public:
        typedef std::map<void*, osg::ref_ptr<osg::Referenced> > UserDataMap;

        template<typename T> T& getOrCreate(void* key)
        {
            UserDataMap::iterator i = _userData.find( key );
            if ( i != _userData.end() )
                return *static_cast<T*>( i->second.get() );
            T* t = new T();
            _userData[key] = t;
            return *t;
        }

    public:
        TraversalData() { }
        static TraversalData* get(osg::NodeVisitor& nv)
        {
            return dynamic_cast<TraversalData*>( nv.getUserData() );
        }

    protected:
        UserDataMap _userData;
    };


    /**
     * Per-camera data for MapNode culling traversals.
     */
    class OSGEARTH_EXPORT MapNodeCullData : public osg::Referenced
    {
    public:
        MapNodeCullData();

    public:
        osg::observer_ptr<class MapNode> _mapNode;
        osg::ref_ptr<osg::StateSet>      _stateSet;
        osg::ref_ptr<osg::Uniform>       _windowScaleMatrixUniform;
        double                           _cameraAltitude;

    protected:
        virtual ~MapNodeCullData() { }
    };

} // namespace osgEarth

#endif // OSGEARTH_TRAVERSAL_DATA_H