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/tgdb/TileEntry.hxx>
  48 #include <simgear/scene/model/ModelRegistry.hxx>
  49 #include <simgear/scene/model/modellib.hxx>
  50
  51 int
  52 main(int argc, char** argv)
  53 {
  54     // Just reference simgears reader writer stuff so that the globals get
  55     // pulled in by the linker ...
  56     // FIXME: make that more explicit clear and call an initialization function
  57     simgear::ModelRegistry::instance();
  58     simgear::TileEntry::setModelLoadHelper(NULL);
  59
  60     // use an ArgumentParser object to manage the program arguments.
  61     osg::ArgumentParser arguments(&argc, argv);
  62
  63     // construct the viewer.
  64     osgViewer::Viewer viewer(arguments);
  65
  66     // set up the camera manipulators.
  67     osgGA::KeySwitchMatrixManipulator* keyswitchManipulator;
  68     keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
  69
  70     keyswitchManipulator->addMatrixManipulator('1', "Trackball",
  71                                                new osgGA::TrackballManipulator);
  72     keyswitchManipulator->addMatrixManipulator('2', "Flight",
  73                                                new osgGA::FlightManipulator);
  74     keyswitchManipulator->addMatrixManipulator('3', "Drive",
  75                                                new osgGA::DriveManipulator);
  76     keyswitchManipulator->addMatrixManipulator('4', "Terrain",
  77                                                new osgGA::TerrainManipulator);
  78
  79     viewer.setCameraManipulator(keyswitchManipulator);
  80
  81     // Usefull stats
  82     viewer.addEventHandler(new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()));
  83     viewer.addEventHandler(new osgViewer::HelpHandler);
  84     viewer.addEventHandler(new osgViewer::StatsHandler);
  85     viewer.addEventHandler(new osgViewer::ThreadingHandler);
  86     viewer.addEventHandler(new osgViewer::LODScaleHandler);
  87     viewer.addEventHandler(new osgViewer::ScreenCaptureHandler);
  88     viewer.addEventHandler(new osgViewer::WindowSizeHandler);
  89
  90     // Sigh, we need our own cull visitor ...
  91     osg::Camera* camera = viewer.getCamera();
  92     osgViewer::Renderer* renderer = static_cast<osgViewer::Renderer*>(camera->getRenderer());
  93     for (int j = 0; j < 2; ++j) {
  94         osgUtil::SceneView* sceneView = renderer->getSceneView(j);
  95         sceneView->setCullVisitor(new simgear::EffectCullVisitor);
  96     }
  97     // Shaders expect valid fog
  98     osg::Fog* fog = new osg::Fog;
  99     fog->setMode(osg::Fog::EXP2);
 100     fog->setColor(osg::Vec4(1, 1, 1, 1));
 101     fog->setDensity(1e-6);
 102     camera->getOrCreateStateSet()->setAttribute(fog);
 103
 104     std::string fg_root;
 105     if (arguments.read("--fg-root", fg_root)) {
 106     } else if (const char *fg_root_env = std::getenv("FG_ROOT")) {
 107         fg_root = fg_root_env;
 108     } else {
 109 #if defined(PKGLIBDIR)
 110         fg_root = PKGLIBDIR;
 111 #else
 112         fg_root = ".";
 113 #endif
 114     }
 115
 116     std::string fg_scenery;
 117     if (arguments.read("--fg-scenery", fg_scenery)) {
 118     } else if (const char *fg_scenery_env = std::getenv("FG_SCENERY")) {
 119         fg_scenery = fg_scenery_env;
 120     } else {
 121         SGPath path(fg_root);
 122         path.append("Scenery");
 123         fg_scenery = path.str();
 124     }
 125
 126     SGSharedPtr<SGPropertyNode> props = new SGPropertyNode;
 127     sgUserDataInit(props.get());
 128     try {
 129         SGPath preferencesFile = fg_root;
 130         preferencesFile.append("preferences.xml");
 131         readProperties(preferencesFile.str(), props);
 132     } catch (...) {
 133         // In case of an error, at least make summer :)
 134         props->getNode("sim/startup/season", true)->setStringValue("summer");
 135
 136         std::cerr << "Problems loading FlightGear preferences.\n"
 137                   << "Probably FG_ROOT is not properly set." << std::endl;
 138     }
 139     SGMaterialLib* ml = new SGMaterialLib;
 140     SGPath mpath(fg_root);
 141     mpath.append("materials.xml");
 142     try {
 143         ml->load(fg_root, mpath.str(), props);
 144     } catch (...) {
 145         std::cerr << "Problems loading FlightGear materials.\n"
 146                   << "Probably FG_ROOT is not properly set." << std::endl;
 147     }
 148     simgear::SGModelLib::init(fg_root, props);
 149
 150     // Set up the reader/writer options
 151     osg::ref_ptr<simgear::SGReaderWriterOptions> options;
 152     if (osgDB::Options* ropt = osgDB::Registry::instance()->getOptions())
 153         options = new simgear::SGReaderWriterOptions(*ropt);
 154     else
 155         options = new simgear::SGReaderWriterOptions;
 156     osgDB::convertStringPathIntoFilePathList(fg_scenery,
 157                                              options->getDatabasePathList());
 158     options->setMaterialLib(ml);
 159     options->setPropertyNode(props);
 160     options->setPluginStringData("SimGear::FG_ROOT", fg_root);
 161     osgDB::Registry::instance()->setOptions(options.get());
 162
 163     // Here, all arguments are processed
 164     arguments.reportRemainingOptionsAsUnrecognized();
 165     arguments.writeErrorMessages(std::cerr);
 166
 167     osg::ref_ptr<osg::Node> loadedModel;
 168     if (arguments.argc() != 1) {
 169         // read the scene from the list of file specified command line args.
 170         loadedModel = osgDB::readNodeFiles(arguments, options.get());
 171     } else {
 172         // if no arguments given resort to the whole world scenery
 173         options->setPluginStringData("SimGear::FG_EARTH", "ON");
 174         loadedModel = osgDB::readNodeFile("w180s90-360x180.spt", options.get());
 175     }
 176
 177     // if no model has been successfully loaded report failure.
 178     if (!loadedModel.valid()) {
 179         std::cerr << arguments.getApplicationName()
 180                   << ": No data loaded" << std::endl;
 181         return EXIT_FAILURE;
 182     }
 183
 184     // pass the loaded scene graph to the viewer.
 185     viewer.setSceneData(loadedModel.get());
 186
 187     // We want on demand database paging
 188     viewer.setDatabasePager(new osgDB::DatabasePager);
 189     viewer.getDatabasePager()->setUpThreads(1, 1);
 190
 191     return viewer.run();
 192 }