OpenSceneGraph/include/osgViewer/CompositeViewer

/* -*-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_CompositeViewer
#define OSGVIEWER_CompositeViewer 1

#include <osg/ArgumentParser>
#include <osgUtil/UpdateVisitor>
#include <osgViewer/GraphicsWindow>
#include <osgViewer/View>

namespace osgViewer {

/** CompsiteViewer holds a or more views to a one more scenes.*/
class OSGVIEWER_EXPORT CompositeViewer : public ViewerBase, public virtual osg::Object
{
    public:

        CompositeViewer();

        CompositeViewer(const CompositeViewer&,const osg::CopyOp& copyop=osg::CopyOp::SHALLOW_COPY);

        CompositeViewer(osg::ArgumentParser& arguments);
        
        META_Object(osgViewer,CompositeViewer);

        virtual ~CompositeViewer();

        /** read the viewer configuration from a configuration file.*/
        bool readConfiguration(const std::string& filename);

        void addView(osgViewer::View* view);
        void removeView(osgViewer::View* view);
        
        osgViewer::View* getView(unsigned i) { return _views[i].get(); }
        const osgViewer::View* getView(unsigned i) const { return _views[i].get(); }
        
        unsigned int getNumViews() const { return _views.size(); }

        
        /** Get whether at least of one of this viewers windows are realized.*/
        virtual bool isRealized() const;

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

        virtual void setStartTick(osg::Timer_t tick);

        void setReferenceTime(double time=0.0);

        osg::FrameStamp* getFrameStamp() { return _frameStamp.get(); }
        const osg::FrameStamp* getFrameStamp() const { return _frameStamp.get(); }

        /** Set the threading model the rendering traversals will use.*/
        virtual void setThreadingModel(ThreadingModel threadingModel);

        void setEventQueue(osgGA::EventQueue* eventQueue) { _eventQueue = eventQueue; }
        osgGA::EventQueue* getEventQueue() { return _eventQueue.get(); }
        const osgGA::EventQueue* getEventQueue() const { return _eventQueue.get(); }


        enum BarrierPosition
        {
            BeforeSwapBuffers,
            AfterSwapBuffers
        };
        
        /** Set the position of the end barrier.
          * AfterSwapBuffers will may result is slightly higher framerates, by may
          * lead to inconcistent swapping between different windows.
          * BeforeSwapBuffers may lead to slightly lower framerate, but improve consistency in timing of swap buffers,
          * especially important if you are likely to consistently break frame.*/
        void setEndBarrierPosition(BarrierPosition bp);

        /** Get the end barrier position.*/
        BarrierPosition getEndBarrierPosition() const { return _endBarrierPosition; }




        /** Execute a main frame loop.
          * Equivialant to while (!viewer.done()) viewer.frame();
          * Also calls realize() if the viewer is not already realized,
          * and installs trackball manipulator if one is not already assigned.
          */
        virtual int run();

        /** Render a complete new frame.
          * Calls advance(), eventTraversal(), updateTraversal(), renderingTraversals(). */
        virtual void frame(double simulationTime=USE_REFERENCE_TIME);

        virtual void advance(double simulationTime=USE_REFERENCE_TIME);

        virtual void eventTraversal();

        virtual void updateTraversal();
        
        virtual void renderingTraversals();

        
        void setCameraWithFocus(osg::Camera* camera);
        osg::Camera* getCameraWithFocus() { return _cameraWithFocus.get(); }
        const osg::Camera* getCameraWithFocus() const { return _cameraWithFocus.get(); }
        
        osgViewer::View* getViewWithFocus() { return _viewWithFocus.get(); }
        const osgViewer::View* getViewWithFocus() const { return _viewWithFocus.get(); }
        
        virtual void getCameras(Cameras& cameras, bool onlyActive=true);
        
        virtual void getContexts(Contexts& contexts, bool onlyValid=true);

        virtual void getWindows(Windows& windows, bool onlyValid=true);

        virtual void getAllThreads(Threads& threads, bool onlyActive=true);

        virtual void getOperationThreads(OperationThreads& threads, bool onlyActive=true);

        virtual void getScenes(Scenes& scenes, bool onlyValid=true);


        /** Set up the threading and processor affinity as per the viewers threading model.*/
        virtual void setUpThreading();      

        /** Stop any threads begin run by viewer.*/
        virtual void stopThreading();

        /** Start any threads required by the viewer, as per viewers ThreadingModel.*/
        virtual void startThreading();        

        /** Get the keyboard and mouse usage of this viewer.*/
        virtual void getUsage(osg::ApplicationUsage& usage) const;

    protected:

        void constructorInit();

        void init();

        void checkWindowStatus();

        typedef std::vector< osg::ref_ptr<osgViewer::View> > Views;
        Views _views;
       
        bool _firstFrame;
        
        BarrierPosition _endBarrierPosition;

        osg::ref_ptr<osg::BarrierOperation> _startRenderingBarrier;
        osg::ref_ptr<osg::BarrierOperation> _endRenderingDispatchBarrier;

        unsigned int computeNumberOfThreadsIncludingMainRequired();

        unsigned int _numThreadsOnBarrier;
        
        osg::Timer_t                        _startTick;
        osg::ref_ptr<osg::FrameStamp>       _frameStamp;

        osg::observer_ptr<osg::Camera>      _cameraWithFocus;
        osg::observer_ptr<osgViewer::View>  _viewWithFocus;
        
        osg::ref_ptr<osgGA::EventQueue>     _eventQueue;
};


}

#endif