/* -*-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.
*/

#ifndef OSGVIEWER_Viewer
#define OSGVIEWER_Viewer 1

#include <osgViewer/GraphicsWindow>
#include <osgViewer/View>

namespace osgViewer {

// WARNING ** Under development do not use, yet :-) 

/** Viewer holds a single view on to a single scene..*/
class OSGVIEWER_EXPORT Viewer : public osgViewer::View
{
    public:

        Viewer();
        virtual ~Viewer();
        
        /** set up windows and associated threads.*/
        void realize();

        void setDone(bool done) { _done = done; }
        
        bool done() { return _done; }

        /** Render a complete new frame.
          * Calls frameAdvance(), frameEventTraversal(), frameUpateTraversal(), frameRenderingTraversals(). */
        virtual void frame();

        virtual void frameAdvance();

        virtual void frameEventTraversal();

        virtual void frameUpdateTraversal();
        
        virtual void frameRenderingTraversals();

        /** Release all OpenGL objects associated with this viewer's scenegraph. Note, does not deleted the actual OpenGL objects, it just releases them to the pending GL object delete lists which will need flushing once a valid graphics context is obtained.*/ 
        virtual void releaseAllGLObjects();

        /** Clean up all OpenGL objects associated with this viewer's scenegraph.*/ 
        virtual void cleanup();
        
    public:
    
        void init();
        
        typedef std::vector<osg::GraphicsContext*> Contexts;
        void getContexts(Contexts& contexts);

        bool _firstFrame;
        bool _done;
       
        osg::ref_ptr<osg::BarrierOperation> _startRenderingBarrier;
        osg::ref_ptr<osg::BarrierOperation> _endRenderingDispatchBarrier;

};


}

#endif