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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_NORMAL_MAP_H
#define OSGEARTHUTIL_NORMAL_MAP_H

#include <osgEarthUtil/Common>
#include <osgEarth/TerrainEffect>
#include <osgEarth/ImageLayer>
#include <osg/observer_ptr>

namespace osgEarth {
    class Map;
}

namespace osgEarth { namespace Util
{
    /**
     * Terrain effect that applies a normal map sampler to the
     * terrain during the lighting phase. The normal map is 
     * provided by a shared ImageLayer.
     */
    class OSGEARTHUTIL_EXPORT NormalMap : public TerrainEffect
    {
    public:
        /** construct a new normal mapping effect */
        NormalMap();

        /** Sets the image layer that generates the normal map. 
            You must call this prior to installing the effect. */
        void setNormalMapLayer(ImageLayer* layer) { _layer = layer; }
        ImageLayer* getNormalMapLayer() { return _layer.get(); }

        /** Sets the LOD at which to start normal mapping */
        void setStartLOD(unsigned lod);
        unsigned getStartLOD() const { return *_startLOD; }

    public: // TerrainEffect interface

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

    public: // serialization

        NormalMap(const Config& conf, Map* map);
        void mergeConfig(const Config& conf);
        virtual Config getConfig() const;

    protected:
        virtual ~NormalMap();
        void init();

        optional<unsigned>    _startLOD;
        optional<std::string> _layerName;

        osg::observer_ptr<ImageLayer> _layer;
        osg::ref_ptr<osg::Uniform>    _samplerUniform;
        osg::ref_ptr<osg::Uniform>    _startLODUniform;
    };

} } // namespace osgEarth::Util

#endif // OSGEARTHUTIL_NORMAL_MAP_H