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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2012 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 OSGEARTHUTIL_VERTICAL_SCALE_H
#define OSGEARTHUTIL_VERTICAL_SCALE_H

#include <osgEarthUtil/Common>
#include <osgEarth/TerrainEffect>
#include <osg/Uniform>
#include <osg/Node>
#include <osg/observer_ptr>


namespace osgEarth { namespace Util
{
    /**
     * Terrain effect that scales the terrain height.
     */
    class OSGEARTHUTIL_EXPORT VerticalScale : public TerrainEffect
    {
    public:
        /** construct a new vertical scaling controller */
        VerticalScale();

        /** Sets the scale factor. (1=default) */
        void setScale( float value );
        float getScale() const { return _scale.get(); }

    public: // TerrainEffect interface

        void onInstall(TerrainEngineNode* engine);
        void onUninstall(TerrainEngineNode* engine);

    public: // serialization

        VerticalScale(const Config& conf);
        void mergeConfig(const Config& conf);
        virtual Config getConfig() const;

    protected:
        virtual ~VerticalScale() { }
        void init();

        optional<float>              _scale;
        osg::ref_ptr<osg::Uniform>   _scaleUniform;
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_VERTICAL_SCALE_H