/* -*-c++-*- */
/* osgEarth - Geospatial SDK for OpenSceneGraph
* Copyright 2020 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_LEGACY_TILE_SOURCE_ELEVATION_LAYER_H
#define OSGEARTH_LEGACY_TILE_SOURCE_ELEVATION_LAYER_H 1

#include <osgEarth/ElevationLayer>
#include <osgEarth/TileSource>

namespace osgEarth { namespace Contrib
{
    using namespace osgEarth;
    /**
    * A map terrain layer containing elevation grid heightfields.
    * @deprecated For legacy application support only
    */
    class OSGEARTH_EXPORT TileSourceElevationLayer : public ElevationLayer
    {
    public:
        class OSGEARTH_EXPORT Options : public ElevationLayer::Options {
        public:
            META_LayerOptions(osgEarth, Options, ElevationLayer::Options);
            OE_OPTION(TileSourceOptions, driver);
            virtual Config getConfig() const;
        private:
            void fromConfig( const Config& conf );
        };

    public:
        META_Layer(osgEarth, TileSourceElevationLayer, Options, ElevationLayer, elevation);

    protected: // Layer

        virtual void init();

    protected: // ElevationLayer

        //! Open the layer for reading.
        virtual Status openImplementation();

        virtual GeoHeightField createHeightFieldImplementation(
            const TileKey& key, 
            ProgressCallback* progress) const;

        virtual ~TileSourceElevationLayer() { }

    private:

        osg::ref_ptr<TileSource> _tileSource;
        TileSource::HeightFieldOperation* getOrCreatePreCacheOp() const;
        mutable osg::ref_ptr<TileSource::HeightFieldOperation> _preCacheOp;
    };

} } // namespace osgEarth

OSGEARTH_SPECIALIZE_CONFIG(osgEarth::Contrib::TileSourceElevationLayer::Options);

#endif // OSGEARTH_LEGACY_TILE_SOURCE_ELEVATION_LAYER_H