libosgearth-dev 2.4.0+dfsg-6 / usr / include / osgEarth / TerrainLayer

/* -*-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_TERRAIN_LAYER_H
#define OSGEARTH_TERRAIN_LAYER_H 1

#include <osgEarth/Common>
#include <osgEarth/Cache>
#include <osgEarth/CachePolicy>
#include <osgEarth/Config>
#include <osgEarth/Layer>
#include <osgEarth/TileSource>
#include <osgEarth/Profile>
#include <osgEarth/ThreadingUtils>
#include <osgEarth/HTTPClient>

namespace osgEarth
{
    /**
     * Initialization (and serializable) options for a terrain layer.
     */
    class OSGEARTH_EXPORT TerrainLayerOptions : public ConfigOptions
    {
    public:
        TerrainLayerOptions( const ConfigOptions& options =ConfigOptions() );
        TerrainLayerOptions( const std::string& name, const TileSourceOptions& driverOptions );

        /** dtor */
        virtual ~TerrainLayerOptions() { }

        /**
         * The readable name of the layer.
         */
        std::string& name() { return _name; }
        const std::string& name() const { return _name; }

        /**
         * Gets the explicity vertical datum identifier that will override a vertical
         * datum specified by the tile source.
         */
        optional<std::string>& verticalDatum() { return _vertDatum; }
        const optional<std::string>& verticalDatum() const { return _vertDatum; }

        /**
         * Options for the underlyint tile source driver.
         */
        optional<TileSourceOptions>& driver() { return _driver; }
        const optional<TileSourceOptions>& driver() const { return _driver; }

        /**
         * Gets or sets the minimum of detail for which this layer should generate data.
         */
        optional<unsigned>& minLevel() { return _minLevel; }
        const optional<unsigned>& minLevel() const { return _minLevel; }

        /**
         * Gets or sets the minimum resolution for which this layer should generate data.
         * The value is in units per pixel, using the base units of the layer's source data.
         */
        optional<double>& minResolution() { return _minResolution; }
        const optional<double>& minResolution() const { return _minResolution; }

        /**
         * The maximum level of detail for which this layer should generate data.
         */
        optional<unsigned>& maxLevel() { return _maxLevel; }
        const optional<unsigned>& maxLevel() const { return _maxLevel; }

        /**
         * The maximum level resolution for which this layer should generate data.
         * The value is in units per pixel, using the base units of the layer's source data.
         */
        optional<double>& maxResolution() { return _maxResolution; }
        const optional<double>& maxResolution() const { return _maxResolution; }
        
        /**
         * Whether to use this layer with the map. Setting this to false means that 
         * the layer will remain in its map model but will not be used by the 
         * terrain engine. You cannot change the "enabled" state at runtime.
         */        
        optional<bool>& enabled() { return _enabled; }
        const optional<bool>& enabled() const { return _enabled; }

        /**
         * Whether to render (or otherwise use) the layer.
         */
        optional<bool>& visible() { return _visible; }
        const optional<bool>& visible() const { return _visible; }

        /**
         * Whether to use exact cropping if image cropping is necessary
         */
        optional<bool>& exactCropping() { return _exactCropping; }
        const optional<bool>& exactCropping() const { return _exactCropping; }

        /**
         * The desired tile size to reproject imagery to if necessary.
         */
        optional<unsigned int>& reprojectedTileSize() { return _reprojectedTileSize; }
        const optional<unsigned int>& reprojectedTileSize() const { return _reprojectedTileSize; }

        /**
         * Explicit cache ID to uniquely identify the cache that matched this
         * layer's tile source properties. This is usually automatically
         * generated but you can override it here.
         */
        optional<std::string>& cacheId() { return _cacheId; }
        const optional<std::string>& cacheId() const { return _cacheId; }

        /**
         * The format that this MapLayer should use when caching. This can be a mime type
         * or a file extension.
         */
        optional<std::string>& cacheFormat() { return _cacheFormat; }
        const optional<std::string>& cacheFormat() const { return _cacheFormat; }

        /**
         * Caching policy to use for this layer.
         */
        optional<CachePolicy>& cachePolicy() { return _cachePolicy; }
        const optional<CachePolicy>& cachePolicy() const { return _cachePolicy; }
        
        /**
         * The loading weight of this MapLayer (for threaded loading policies).
         */
        optional<float>& loadingWeight() { return _loadingWeight; }
        const optional<float>& loadingWeight() const { return _loadingWeight; }

        /**
         * The ratio used to expand the extent of a tile when the layer
         * needs to be mosaiced to projected.  This can be used to increase the
         * number of tiles grabbed to ensure that enough data is grabbed to
         * overlap the incoming tile.
         */
        optional<double>& edgeBufferRatio() { return _edgeBufferRatio;}
        const optional<double>& edgeBufferRatio() const { return _edgeBufferRatio; }

        /** 
         * The hostname/port of a proxy server to use for HTTP communications on this layer
         * Default = no proxy.
         */
        optional<ProxySettings>& proxySettings() { return _proxySettings; }
        const optional<ProxySettings>& proxySettings() const { return _proxySettings; }

    public:
        virtual Config getConfig() const { return getConfig(false); }
        virtual Config getConfig( bool isolate ) const;
        virtual void mergeConfig( const Config& conf );

    private:
        void fromConfig( const Config& conf );
        void setDefaults();
       
        std::string                 _name;
        optional<std::string>       _vertDatum;
        optional<TileSourceOptions> _driver;
        optional<unsigned>          _minLevel;
        optional<unsigned>          _maxLevel;
        optional<double>            _minResolution;
        optional<double>            _maxResolution;
        optional<float>             _loadingWeight;
        optional<bool>              _exactCropping;
        optional<bool>              _enabled;
        optional<bool>              _visible;
        optional<unsigned>          _reprojectedTileSize;
        optional<double>            _edgeBufferRatio;        

        optional<std::string>       _cacheId;
        optional<std::string>       _cacheFormat;
        optional<CachePolicy>       _cachePolicy;
        optional<ProxySettings>     _proxySettings;
    };

    /**
     * Runtime property notification callback for TerrainLayers.
     */
    struct TerrainLayerCallback : public osg::Referenced
    {
        virtual void onVisibleChanged( class TerrainLayer* layer ) { }
        virtual ~TerrainLayerCallback() { }
    };

    typedef void (TerrainLayerCallback::*TerrainLayerCallbackMethodPtr)(TerrainLayer* layer);


    /**
     * A layer that comprises the terrain skin (image or elevation layer)
     */
    class OSGEARTH_EXPORT TerrainLayer : public Layer
    {
    protected:
        TerrainLayer( 
            const TerrainLayerOptions& initOptions, 
            TerrainLayerOptions*       runtimeOptions );
        
        TerrainLayer( 
            const TerrainLayerOptions& initOptions, 
            TerrainLayerOptions*       runtimeOptions,
            TileSource*                tileSource );

        virtual ~TerrainLayer();

    public:

        /**
         * The options data connected to this layer.
         */
        const TerrainLayerOptions& getInitialOptions() const { return _initOptions; }

        const TerrainLayerOptions& getTerrainLayerRuntimeOptions() const { return *_runtimeOptions; }

        /**
         * Whether to use this layer. Note, a layer is enabled/disabled once and its
         * status cannot be changed.
         */
        bool getEnabled() const { return *_runtimeOptions->enabled(); }

        /**
         * Whether to draw (or otherwise use) this layer.
         */
        void setVisible( bool value );
        bool getVisible() const { return getEnabled() && *_runtimeOptions->visible(); }

        /**
         * Gets the readable name of the map layer.
         */
        const std::string& getName() const { return getTerrainLayerRuntimeOptions().name(); }

        /**
         * Gets the profile of this MapLayer
         */
        const Profile* getProfile() const;

        /**
         * Gets the underlying TileSource engine that serves this map layer. Use with caution.
         */
        TileSource* getTileSource() const;

        /**
         * Gets the tile size of the this MapLayer
         */
        unsigned int getTileSize() const;
        
        /**
         * Whether the layer represents dynamic data, i.e. tile data that can change.
         */
        bool isDynamic() const;

        /**
         * Whether the given key is valid for this layer
         */
        virtual bool isKeyValid(const TileKey& key) const;

        /** 
         * Whether the data for the specified tile key is in the cache.
         */
        virtual bool isCached(const TileKey& key) const;
        
        /**
         * Gives the terrain layer a hint as to what the target profile of 
         * images will be. This is optional, but it may allow the layer to enable
         * certain optimizations since it has more information as to how the
         * data will be used.
         */
        virtual void setTargetProfileHint( const Profile* profile );

        /** 
         * The cache bin for storing data generated by this layer
         */
        virtual CacheBin* getCacheBin( const Profile* profile );
        
        /**
         * Gets the Cache to be used on this TerrainLayer.
         */
        Cache* getCache() const { return _cache.get(); }

        /**
         * Convenience function to check for cache_only mode
         */
        bool isCacheOnly() const {
            return 
                _runtimeOptions->cachePolicy().isSet() &&
                _runtimeOptions->cachePolicy()->usage() == CachePolicy::USAGE_CACHE_ONLY;
        }

    public: // Layer interface

        virtual SequenceControl* getSequenceControl();


    public:
        
        /**
         * Metadata about the terrain layer that is stored in the cache, and read
         * when the cache is opened.
         */
        struct CacheBinMetadata
        {
            CacheBinMetadata() { }

            CacheBinMetadata( const CacheBinMetadata& rhs ) :
                _empty        ( rhs._empty ),
                _cacheBinId   ( rhs._cacheBinId ),
                _sourceName   ( rhs._sourceName ),
                _sourceDriver ( rhs._sourceDriver ),                
                _sourceProfile( rhs._sourceProfile ),
                _cacheProfile ( rhs._cacheProfile ) { }

            CacheBinMetadata( const Config& conf )
            {
                _empty = conf.empty();
                conf.getIfSet   ( "cachebin_id",    _cacheBinId );
                conf.getIfSet   ( "source_name",    _sourceName );
                conf.getIfSet   ( "source_driver",  _sourceDriver );                
                conf.getObjIfSet( "source_profile", _sourceProfile );
                conf.getObjIfSet( "cache_profile",  _cacheProfile );
            }

            Config getConfig() const
            {
                Config conf( "osgearth_terrainlayer_cachebin" );
                conf.addIfSet   ( "cachebin_id",    _cacheBinId );
                conf.addIfSet   ( "source_name",    _sourceName );
                conf.addIfSet   ( "source_driver",  _sourceDriver );                
                conf.addObjIfSet( "source_profile", _sourceProfile );
                conf.addObjIfSet( "cache_profile",  _cacheProfile );
                return conf;
            }

            bool                     _empty;
            optional<std::string>    _cacheBinId;
            optional<std::string>    _sourceName;
            optional<std::string>    _sourceDriver;            
            optional<ProfileOptions> _sourceProfile;
            optional<ProfileOptions> _cacheProfile;
        };

        /**
         * Access to information about the cache 
         */
        bool getCacheBinMetadata( const Profile* profile, CacheBinMetadata& output );

    protected:

        virtual void initTileSource();

        CacheBin* getCacheBin( const Profile* profile, const std::string& binId );

    protected:

        osg::ref_ptr<TileSource>       _tileSource;
        osg::ref_ptr<const Profile>    _profile;
        osg::ref_ptr<const Profile>    _targetProfileHint;
        bool                           _tileSourceInitAttempted;
        bool                           _tileSourceInitFailed;
        unsigned                       _tileSize;  
        osg::ref_ptr<osgDB::Options>   _dbOptions;

        void setCachePolicy( const CachePolicy& cp );
        const CachePolicy& getCachePolicy() const;

    private:
        std::string                    _name;
        std::string                    _referenceURI;
        OpenThreads::Mutex             _initTileSourceMutex;
        TerrainLayerOptions            _initOptions;
        TerrainLayerOptions*           _runtimeOptions;

        osg::ref_ptr<Cache>            _cache;

        // maps profile signature to cache bin pointer.
        struct CacheBinInfo
        {
            osg::ref_ptr<CacheBin>     _bin;
            optional<CacheBinMetadata> _metadata;
        };
        typedef std::map< std::string, CacheBinInfo > CacheBinInfoMap; // indexed by profile signature

        CacheBinInfoMap                _cacheBins;
        Threading::ReadWriteMutex      _cacheBinsMutex;

        void init();
        //void applyCacheFormat( CacheBin* bin, const std::string& format );
        virtual void fireCallback( TerrainLayerCallbackMethodPtr method ) =0;

        // methods accesible by Map:
        friend class Map;
        void setDBOptions( const osgDB::Options* dbOptions );
        void initializeCachePolicy( const osgDB::Options* );
        void storeProxySettings( osgDB::Options* );

        /**
         * Sets the cache to be used on this MapLayer
         * TODO: is it legal to set this at any time?
         */
        void setCache( Cache* cache );
    };

    typedef std::vector<osg::ref_ptr<TerrainLayer> > TerrainLayerVector;

} // namespace TerrainLayer

#endif // OSGEARTH_TERRAIN_LAYER_H