source: experimental/osgVisualNG/visual_core.cpp @ 421

/* -*-c++-*- osgVisual - Copyright (C) 2009-2011 Torben Dannhauer
 *
 * This library is based on OpenSceneGraph, 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.
 *
 * osgVisual requires for some proprietary modules a license from the correspondig manufacturer.
 * You have to aquire licenses for all used proprietary modules.
 * 
 * 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.
*/


#include <visual_core.h>
#include <visual_util.h>
#include <osgTerrain/Terrain>
#include <osgDB/FileNameUtils>

using namespace osgVisual;

visual_core::visual_core(osg::ArgumentParser& arguments_) : arguments(arguments_)
{
        OSG_NOTIFY( osg::ALWAYS ) << "visual_core instantiated." << std::endl;
}

visual_core::~visual_core(void)
{
        OSG_NOTIFY( osg::ALWAYS ) << "visual_core destroyed." << std::endl;
}

void visual_core::initialize()
{
        OSG_NOTIFY( osg::ALWAYS ) << "Initialize visual_core..." << std::endl;


        // Configure osg to use KdTrees
        osgDB::Registry::instance()->setBuildKdTreesHint(osgDB::ReaderWriter::Options::BUILD_KDTREES);

        // Configure Multisampling
        osg::DisplaySettings::instance()->setNumMultiSamples(4);

        // Setup pathes
        osgDB::Registry::instance()->getDataFilePathList().push_back( "D:/DA/osgVisual/models" );
        
        // Setup viewer
        viewer = new osgViewer::Viewer(arguments);

        // Setup coordinate system node
        rootNode = new osg::CoordinateSystemNode;       
        rootNode->setEllipsoidModel(new osg::EllipsoidModel());


        //osg::DisplaySettings::instance()->setNumOfDatabaseThreadsHint( 8 );

        // Show model
        viewer->setSceneData( rootNode );

        // create the windows and run the threads.
        viewer->realize();

        loadTerrain(arguments);

        // All modules are initialized - now check arguments for any unused parameter.
        checkCommandlineArgumentsForFinalErrors();

        // Run visual main loop
        mainLoop();
}

void visual_core::mainLoop()
{
        int framestoScenerySetup = 5;
        // run main loop
        while( !viewer->done() )
    {
                // setup scenery
                if(framestoScenerySetup-- == 0)
                        setupScenery();

                // next frame please....
        viewer->advance();

                /*double hat, hot, lat, lon, height;
                util::getWGS84ofCamera( viewer->getCamera(), rootNode, lat, lon, height);
                if (util::queryHeightOfTerrain( hot, rootNode, lat, lon) && util::queryHeightAboveTerrainInWGS84( hat, rootNode, lat, lon, height ) )
                        OSG_NOTIFY( osg::ALWAYS ) << "HOT is: " << hot << ", HAT is: " << hat << std::endl;*/
        
                // perform all queued events
                viewer->eventTraversal();

                // update the scene by traversing it with the the update visitor which will
        // call all node update callbacks and animations.
        viewer->updateTraversal();
                
        // Render the Frame.
        viewer->renderingTraversals();

    }   // END WHILE
}

void visual_core::shutdown()
{
        OSG_NOTIFY( osg::ALWAYS ) << "Shutdown visual_core..." << std::endl;

        // Unset scene data
        viewer->setSceneData( NULL );

        // Shutdown data
        rootNode = NULL;

        // Destroy osgViewer
        viewer = NULL;
}

bool visual_core::loadTerrain(osg::ArgumentParser& arguments_)
{
        //std::vector<std::string> terrainFile = util::getTerrainFromXMLConfig(configFilename);

        // Add each terrain path to the FilePath list to help OSG to find the subtiles. 
        for(unsigned int i=0;i<terrainFile.size();i++)
                osgDB::Registry::instance()->getDataFilePathList().push_back(osgDB::getFilePath(terrainFile[i]));

        osg::ref_ptr<osg::Node> model = osgDB::readNodeFiles(terrainFile);
        if( model.valid() )
        {
        osgTerrain::Terrain* terrain = util::findTopMostNodeOfType<osgTerrain::Terrain>(model.get());
                if (!terrain)
                {
                        terrain = new osgTerrain::Terrain;
                        terrain->addChild(model.get());

                        model = terrain;                        
                }
                rootNode->addChild( terrain );
                return true;
        }
        else
        {
        OSG_NOTIFY( osg::FATAL ) << "Load terrain: No data loaded" << std::endl;
        return false;
    }    

        return false;
}

bool visual_core::checkCommandlineArgumentsForFinalErrors()
{
        // Setup Application Usage
        arguments.getApplicationUsage()->setApplicationName(arguments.getApplicationName());
        arguments.getApplicationUsage()->setDescription(arguments.getApplicationName()+" is the a new visualization tool, written by Torben Dannhauer");
        arguments.getApplicationUsage()->addCommandLineOption("-h or --help","Display this information");


    // if user request help write it out to cout.
    if (arguments.read("-h") || arguments.read("--help"))
    {
        arguments.getApplicationUsage()->write(std::cout);
                //cause the viewer to exit and shut down clean.
        viewer->setDone(true);
    }

    // report any errors if they have occurred when parsing the program arguments.
    if (arguments.errors())
    {
        arguments.writeErrorMessages(std::cout);
                //cause the viewer to exit and shut down clean.
        viewer->setDone(true);
    }

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

    // report any errors if they have occurred when parsing the program arguments.
    if (arguments.errors())
    {
        arguments.writeErrorMessages(std::cout);
        return false;
    }
        return true;
}

void visual_core::setupScenery()
{
        // Nothing
}