utils/fgviewer/fgviewer.cxx

   1 // fgviewer.cxx -- alternative flightgear viewer application
   2 //
   3 // Copyright (C) 2009 - 2011  Mathias Froehlich
   4 //
   5 // This program is free software; you can redistribute it and/or
   6 // modify it under the terms of the GNU General Public License as
   7 // published by the Free Software Foundation; either version 2 of the
   8 // License, or (at your option) any later version.
   9 //
  10 // This program is distributed in the hope that it will be useful, but
  11 // WITHOUT ANY WARRANTY; without even the implied warranty of
  12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 // General Public License for more details.
  14 //
  15 // You should have received a copy of the GNU General Public License
  16 // along with this program; if not, write to the Free Software
  17 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18
  19 #ifdef HAVE_CONFIG_H
  20 #include <config.h>
  21 #endif
  22
  23 #include <iostream>
  24 #include <cstdlib>
  25
  26 #include <osg/ArgumentParser>
  27 #include <osg/Fog>
  28 #include <osgDB/ReadFile>
  29 #include <osgViewer/Viewer>
  30 #include <osgViewer/ViewerEventHandlers>
  31 #include <osgViewer/Renderer>
  32 #include <osgGA/KeySwitchMatrixManipulator>
  33 #include <osgGA/StateSetManipulator>
  34 #include <osgGA/TrackballManipulator>
  35 #include <osgGA/FlightManipulator>
  36 #include <osgGA/DriveManipulator>
  37 #include <osgGA/TerrainManipulator>
  38
  39 #include <simgear/props/props.hxx>
  40 #include <simgear/props/props_io.hxx>
  41 #include <simgear/misc/sg_path.hxx>
  42 #include <simgear/scene/material/EffectCullVisitor.hxx>
  43 #include <simgear/scene/material/matlib.hxx>
  44 #include <simgear/scene/util/OsgMath.hxx>
  45 #include <simgear/scene/util/SGReaderWriterOptions.hxx>
  46 #include <simgear/scene/tgdb/userdata.hxx>
  47 #include <simgear/scene/model/ModelRegistry.hxx>
  48 #include <simgear/scene/model/modellib.hxx>
  49
  50 int
  51 main(int argc, char** argv)
  52 {
  53     // Just reference simgears reader writer stuff so that the globals get
  54     // pulled in by the linker ...
  55     // FIXME: make that more explicit clear and call an initialization function
  56     simgear::ModelRegistry::instance();
  57
  58     // use an ArgumentParser object to manage the program arguments.
  59     osg::ArgumentParser arguments(&argc, argv);
  60
  61     // construct the viewer.
  62     osgViewer::Viewer viewer(arguments);
  63
  64     // set up the camera manipulators.
  65     osgGA::KeySwitchMatrixManipulator* keyswitchManipulator;
  66     keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
  67
  68     keyswitchManipulator->addMatrixManipulator('1', "Trackball",
  69                                                new osgGA::TrackballManipulator);
  70     keyswitchManipulator->addMatrixManipulator('2', "Flight",
  71                                                new osgGA::FlightManipulator);
  72     keyswitchManipulator->addMatrixManipulator('3', "Drive",
  73                                                new osgGA::DriveManipulator);
  74     keyswitchManipulator->addMatrixManipulator('4', "Terrain",
  75                                                new osgGA::TerrainManipulator);
  76
  77     viewer.setCameraManipulator(keyswitchManipulator);
  78
  79     // Usefull stats
  80     viewer.addEventHandler(new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()));
  81     viewer.addEventHandler(new osgViewer::HelpHandler);
  82     viewer.addEventHandler(new osgViewer::StatsHandler);
  83     viewer.addEventHandler(new osgViewer::ThreadingHandler);
  84     viewer.addEventHandler(new osgViewer::LODScaleHandler);
  85     viewer.addEventHandler(new osgViewer::ScreenCaptureHandler);
  86     viewer.addEventHandler(new osgViewer::WindowSizeHandler);
  87
  88     // Sigh, we need our own cull visitor ...
  89     osg::Camera* camera = viewer.getCamera();
  90     osgViewer::Renderer* renderer = static_cast<osgViewer::Renderer*>(camera->getRenderer());
  91     for (int j = 0; j < 2; ++j) {
  92         osgUtil::SceneView* sceneView = renderer->getSceneView(j);
  93         sceneView->setCullVisitor(new simgear::EffectCullVisitor);
  94     }
  95     // Shaders expect valid fog
  96     osg::Fog* fog = new osg::Fog;
  97     fog->setMode(osg::Fog::EXP2);
  98     fog->setColor(osg::Vec4(1, 1, 1, 1));
  99     fog->setDensity(1e-6);
 100     camera->getOrCreateStateSet()->setAttribute(fog);
 101
 102     std::string fg_root;
 103     if (arguments.read("--fg-root", fg_root)) {
 104     } else if (const char *fg_root_env = std::getenv("FG_ROOT")) {
 105         fg_root = fg_root_env;
 106     } else {
 107 #if defined(PKGLIBDIR)
 108         fg_root = PKGLIBDIR;
 109 #else
 110         fg_root = ".";
 111 #endif
 112     }
 113
 114     std::string fg_scenery;
 115     if (arguments.read("--fg-scenery", fg_scenery)) {
 116     } else if (const char *fg_scenery_env = std::getenv("FG_SCENERY")) {
 117         fg_scenery = fg_scenery_env;
 118     } else {
 119         SGPath path(fg_root);
 120         path.append("Scenery");
 121         fg_scenery = path.str();
 122     }
 123
 124     SGSharedPtr<SGPropertyNode> props = new SGPropertyNode;
 125     sgUserDataInit(props.get());
 126     try {
 127         SGPath preferencesFile = fg_root;
 128         preferencesFile.append("preferences.xml");
 129         readProperties(preferencesFile.str(), props);
 130     } catch (...) {
 131         // In case of an error, at least make summer :)
 132         props->getNode("sim/startup/season", true)->setStringValue("summer");
 133
 134         std::cerr << "Problems loading FlightGear preferences.\n"
 135                   << "Probably FG_ROOT is not properly set." << std::endl;
 136     }
 137     SGMaterialLib* ml = new SGMaterialLib;
 138     SGPath mpath(fg_root);
 139     mpath.append("materials.xml");
 140     try {
 141         ml->load(fg_root, mpath.str(), props);
 142     } catch (...) {
 143         std::cerr << "Problems loading FlightGear materials.\n"
 144                   << "Probably FG_ROOT is not properly set." << std::endl;
 145     }
 146     simgear::SGModelLib::init(fg_root, props);
 147
 148     // Set up the reader/writer options
 149     osg::ref_ptr<simgear::SGReaderWriterOptions> options;
 150     if (osgDB::Options* ropt = osgDB::Registry::instance()->getOptions())
 151         options = new simgear::SGReaderWriterOptions(*ropt);
 152     else
 153         options = new simgear::SGReaderWriterOptions;
 154     osgDB::convertStringPathIntoFilePathList(fg_scenery,
 155                                              options->getDatabasePathList());
 156     options->setMaterialLib(ml);
 157     options->setPropertyNode(props);
 158     options->setPluginStringData("SimGear::FG_ROOT", fg_root);
 159     osgDB::Registry::instance()->setOptions(options.get());
 160
 161     // Here, all arguments are processed
 162     arguments.reportRemainingOptionsAsUnrecognized();
 163     arguments.writeErrorMessages(std::cerr);
 164
 165     osg::ref_ptr<osg::Node> loadedModel;
 166     if (arguments.argc() != 1) {
 167         // read the scene from the list of file specified command line args.
 168         loadedModel = osgDB::readNodeFiles(arguments, options.get());
 169     } else {
 170         // if no arguments given resort to the whole world scenery
 171         options->setPluginStringData("SimGear::FG_EARTH", "ON");
 172         loadedModel = osgDB::readNodeFile("w180s90-360x180.spt", options.get());
 173     }
 174
 175     // if no model has been successfully loaded report failure.
 176     if (!loadedModel.valid()) {
 177         std::cerr << arguments.getApplicationName()
 178                   << ": No data loaded" << std::endl;
 179         return EXIT_FAILURE;
 180     }
 181
 182     // pass the loaded scene graph to the viewer.
 183     viewer.setSceneData(loadedModel.get());
 184
 185     // We want on demand database paging
 186     viewer.setDatabasePager(new osgDB::DatabasePager);
 187     viewer.getDatabasePager()->setUpThreads(1, 1);
 188
 189     return viewer.run();
 190 }