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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
 * Copyright 2015 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 OSGEARTHFEATURES_FEATURE_DRAW_SET_H
#define OSGEARTHFEATURES_FEATURE_DRAW_SET_H 1

#include <osgEarthFeatures/Common>
#include <osg/Geometry>
#include <set>

namespace osgEarth { namespace Features
{
    /**
     * Contains a catalog of nodes and/or primitive set groups that comprise
     * a single Feature in the scene.
     */
    class OSGEARTHFEATURES_EXPORT FeatureDrawSet
    {     
    public: // types
        typedef osg::Geometry::PrimitiveSetList                        PrimitiveSets;
        struct DrawableSlice {
            osg::ref_ptr<osg::Drawable> drawable;
            PrimitiveSets               primSets;
            osg::Matrixd                local2world;
        };
        //typedef std::pair< osg::ref_ptr<osg::Drawable>, PrimitiveSets> DrawableSlice;
        typedef std::vector<DrawableSlice>                             DrawableSlices;
        typedef std::vector< osg::ref_ptr<osg::Node> >                 Nodes;

    public:
        FeatureDrawSet();
        virtual ~FeatureDrawSet();

        /** Nodes comprising this draw set */
        Nodes& nodes() { return _nodes; }
        const Nodes& nodes() const { return _nodes; }

        /** Drawable/primitive-set-list pairs comprising this draw set */
        DrawableSlices& slices() { return _slices; }
        const DrawableSlices& slices() const { return _slices; }

        /** Gets the primitive sets list associated with a drawable, creating the entry as necessary */
        PrimitiveSets& getOrCreateSlice(osg::Drawable* d);

        /** Gets a slice, given a drawable; or slices().end() if not found. */
        DrawableSlices::iterator slice(osg::Drawable* d);
        DrawableSlices::const_iterator slice(osg::Drawable* d) const;

        /** Whether the draw set is empty */
        bool empty() const { return _nodes.empty() && _slices.empty(); }

        /** Sets the visibility of the draw set. */
        void setVisible( bool value );

        /** Clears out this draw set */
        void clear();

        /** Collects a set containing primitive indicies used in a slice. */
        void collectPrimitiveIndexSet( const DrawableSlice& slice, std::set<unsigned>& output ) const;
        
        /** Creates a shallow copy of the draw set under its own scene graph */
        osg::Node* createCopy();

    private:
        Nodes          _nodes;
        DrawableSlices _slices;

        typedef std::vector<unsigned> Masks;

        bool            _visible;
        Masks           _invisibleMasks;
    };

} } // namespace osgEarth::Features

#endif // OSGEARTHFEATURES_FEATURE_DRAW_SET_H