/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/
//
// OpenFlightŪ loader for OpenSceneGraph
//
//  Copyright (C) 2005-2006  Brede Johansen
//

#ifndef OSGSIM_OPENFLIGHTOPTIMIZER
#define OSGSIM_OPENFLIGHTOPTIMIZER

#include <osg/NodeVisitor>
#include <osg/Group>
#include <osg/Geometry>

#include <osgSim/Export>

namespace osgFlightUtil {

/** Flight optimizer
  */
class OSGSIM_EXPORT Optimizer
{
    public:

        Optimizer() {}
        virtual ~Optimizer() {}

        enum OptimizationOptions
        {
            TESSELLATE_POLYGON =         0x001,
            MERGE_GEODES =              0x002,
            MAKE_LIT =                  0x004,
            DEFAULT_OPTIMIZATIONS = TESSELLATE_POLYGON | MERGE_GEODES,
            ALL_OPTIMIZATIONS = TESSELLATE_POLYGON | MERGE_GEODES
        };

        
        /** Traverse the node and its subgraph with a series of optimization
          * visitors, specified by the OptimizationOptions.*/
        void optimize(osg::Node* node);

        /** Traverse the node and its subgraph with a series of optimization
          * visitors, specified by the OptimizationOptions.*/
        virtual void optimize(osg::Node* node, unsigned int options);
       
    protected:

    
    public:

        class OSGSIM_EXPORT TessellateVisitor : public osg::NodeVisitor
        {
            public:

                /// default to traversing all children.
                TessellateVisitor() :
                    osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {}

                virtual void apply(osg::Geode& geode);

            protected:
    
                bool hasPolygons(osg::Geometry& geometry);

        };

        class OSGSIM_EXPORT MakeLitVisitor : public osg::NodeVisitor
        {
            public:

                /// default to traversing all children.
                MakeLitVisitor() :
                    osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {}

                virtual void apply(osg::Geode& geode);
        };


        /** Combine geodes
          */
        class OSGSIM_EXPORT MergeGeodesVisitor : public osg::NodeVisitor
        {
            public:

                /// default to traversing all children.
                MergeGeodesVisitor() :
                    osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {}

                virtual void apply(osg::Group& group);

                void mergeGeodes(osg::Group& group);

            protected:

                bool mergeGeode(osg::Geode& lhs, osg::Geode& rhs);

        };

};

} // end namespace

#endif