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