/* osgEarth
 * Copyright 2008-2014 Pelican Mapping
 * MIT License
 */
#ifndef OSGEARTH_REX_UNLOADER
#define OSGEARTH_REX_UNLOADER 1

#include "Common"
#include "TileNode"
#include <osgEarth/FrameClock>
#include <osg/Group>


namespace osgEarth { namespace REX
{
    class TileNodeRegistry;

    /**
     * Group-based tile unloader.
     */
    class UnloaderGroup : public osg::Group
    {
    public:
        //! Construct an unloader for a registry
        UnloaderGroup(TileNodeRegistry* tiles, const TerrainOptionsAPI& options);

        //! Set the frame clock to use
        void setFrameClock(const FrameClock* value) { _clock = value; }

    public: // osg::Node
        void traverse(osg::NodeVisitor& nv) override;

    protected:
        TerrainOptionsAPI _options;
        TileNodeRegistry* _tiles;
        std::vector<osg::observer_ptr<TileNode> > _deadpool;
        unsigned _frameLastUpdated;
        const FrameClock* _clock;
    };

} } // namespace osgEarth::REX


#endif // OSGEARTH_REX_UNLOADER
