OpenSceneGraph/examples/osgcameragroup/osgcameragroup.cpp

//C++ source file - Open Producer - Copyright (C) 2002 Don Burns
//Distributed under the terms of the GNU LIBRARY GENERAL PUBLIC LICENSE (LGPL)
//as published by the Free Software Foundation.

// Simple example of use of Producer::RenderSurface
// The myGraphics class is a simple sample of how one would implement
// graphics drawing with Producer::RenderSurface

#include <stdio.h>

#include <Producer/Camera>
#include <Producer/CameraConfig>
#include <Producer/InputArea>
#include <Producer/KeyboardMouse>
#include <Producer/Trackball>

#include <osg/Timer>

#include <osgUtil/Optimizer>
#include <osgUtil/UpdateVisitor>

#include <osgDB/ReadFile>


#include <osgProducer/OsgCameraGroup>
#include <osgProducer/OsgSceneHandler>


class MyKeyboardMouseCallback : public Producer::KeyboardMouseCallback
{
    public:

	MyKeyboardMouseCallback() :
		Producer::KeyboardMouseCallback(),
		_mx(0.0f),_my(0.0f),_mbutton(0),
		_done(false)	
		{}

	virtual void specialKeyPress( Producer::KeyCharacter key )
	{
		if (key==Producer::KeyChar_Escape)
                    shutdown();
	}

        virtual void shutdown()
        {
            _done = true; 
        }

	virtual void keyPress( Producer::KeyCharacter )
	{
	}

	virtual void mouseMotion( float mx, float my ) 
	{
		_mx = mx;
		_my = my;
	}
	virtual void buttonPress( float mx, float my, unsigned int mbutton ) 
	{
		_mx = mx;
		_my = my;
		_mbutton |= (1<<(mbutton-1));
	}
	virtual void buttonRelease( float mx, float my, unsigned int mbutton ) 
	{
		_mx = mx;
		_my = my;
		_mbutton &= ~(1<<(mbutton-1));
	}

	bool done() { return _done; }
	float mx()  { return _mx; }
	float my()  { return _my; }
	unsigned int mbutton()  { return _mbutton; }

    private:

	float _mx, _my;
	unsigned int _mbutton;
	bool _done;
};

int main( int argc, char **argv )
{

    // use an ArgumentParser object to manage the program arguments.
    osg::ArgumentParser arguments(&argc,argv);
    
    // set up the usage document, in case we need to print out how to use this program.
    arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
    arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the standard example of using osgProducer::CameraGroup.");
    arguments.getApplicationUsage()->setCommandLineUsage(arguments.getApplicationName()+" [options] filename ...");
    arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");

    // create the camera group.
    osgProducer::OsgCameraGroup cg(arguments);

    // if user request help write it out to cout.
    if (arguments.read("-h") || arguments.read("--help"))
    {
        arguments.getApplicationUsage()->write(std::cout);
        return 1;
    }

    // any option left unread are converted into errors to write out later.
    arguments.reportRemainingOptionsAsUnrecognized();

    // report any errors if they have occured when parsing the program aguments.
    if (arguments.errors())
    {
        arguments.writeErrorMessages(std::cout);
        return 1;
    }
    
    if (arguments.argc()<=1)
    {
        arguments.getApplicationUsage()->write(std::cout,osg::ApplicationUsage::COMMAND_LINE_OPTION);
        return 1;
    }

    // read the scene.
    osg::ref_ptr<osg::Node> loadedModel = osgDB::readNodeFiles(arguments);
    if (!loadedModel) 
    {
        std::cout << arguments.getApplicationName() <<": No data loaded" << std::endl;
        return 1;
    }

    osgUtil::Optimizer optimizer;
    optimizer.optimize(loadedModel.get());

    // set up the keyboard and mouse handling.
    Producer::InputArea *ia = cg.getCameraConfig()->getInputArea();
    Producer::KeyboardMouse *kbm = ia ?
                                   (new Producer::KeyboardMouse(ia)) : 
                                   (new Producer::KeyboardMouse(cg.getCamera(0)->getRenderSurface()));


    MyKeyboardMouseCallback kbmcb;
    
    // register the callback with the keyboard mouse manger.
    kbm->setCallback( &kbmcb );
    kbm->startThread();
    
    // set the scene to render
    cg.setSceneData(loadedModel.get());


    const osg::BoundingSphere& bs = loadedModel->getBound();

    osg::ref_ptr<Producer::Trackball> tb = new Producer::Trackball;
    tb->setOrientation( Producer::Trackball::Z_UP );
    tb->setDistance(bs.radius()*3.0f);
    tb->translate(-bs.center().x(),-bs.center().y(),-bs.center().z());

    // create the windows and run the threads.
    cg.realize();

    osgUtil::UpdateVisitor update;

    while( !kbmcb.done() )
    {
        // syncronize to the when cull and draw threads have completed.
        cg.sync();

        // update the scene by traversing it with the the update visitor which will
        // call all node update callbacks and animations.
        cg.getSceneData()->accept(update);

	tb->input( kbmcb.mx(), kbmcb.my(), kbmcb.mbutton() );

        // update the main producer camera
        cg.setViewByMatrix(tb->getMatrix());
         
        // fire off the cull and draw traversals of the scene.
        cg.frame();
    }

    // syncronize to the when cull and draw threads have completed.
    cg.sync();

    return 0;
}