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 class DummyLoadHelper : public simgear::ModelLoadHelper {
  52 public:
  53     virtual osg::Node *loadTileModel(const string& modelPath, bool)
  54     {
  55         try {
  56             return simgear::SGModelLib::loadModel(modelPath, simgear::getPropertyRoot());
  57         } catch (...) {
  58             std::cerr << "Error loading \"" << modelPath << "\"" << std::endl;
  59             return 0;
  60         }
  61     }
  62 };
  63
  64 int
  65 main(int argc, char** argv)
  66 {
  67     // Just reference simgears reader writer stuff so that the globals get
  68     // pulled in by the linker ...
  69     // FIXME: make that more explicit clear and call an initialization function
  70     simgear::ModelRegistry::instance();
  71     DummyLoadHelper dummyLoadHelper;
  72     simgear::TileEntry::setModelLoadHelper(&dummyLoadHelper);
  73
  74     // use an ArgumentParser object to manage the program arguments.
  75     osg::ArgumentParser arguments(&argc, argv);
  76
  77     // construct the viewer.
  78     osgViewer::Viewer viewer(arguments);
  79
  80     // set up the camera manipulators.
  81     osgGA::KeySwitchMatrixManipulator* keyswitchManipulator;
  82     keyswitchManipulator = new osgGA::KeySwitchMatrixManipulator;
  83
  84     keyswitchManipulator->addMatrixManipulator('1', "Trackball",
  85                                                new osgGA::TrackballManipulator);
  86     keyswitchManipulator->addMatrixManipulator('2', "Flight",
  87                                                new osgGA::FlightManipulator);
  88     keyswitchManipulator->addMatrixManipulator('3', "Drive",
  89                                                new osgGA::DriveManipulator);
  90     keyswitchManipulator->addMatrixManipulator('4', "Terrain",
  91                                                new osgGA::TerrainManipulator);
  92
  93     viewer.setCameraManipulator(keyswitchManipulator);
  94
  95     // Usefull stats
  96     viewer.addEventHandler(new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()));
  97     viewer.addEventHandler(new osgViewer::HelpHandler);
  98     viewer.addEventHandler(new osgViewer::StatsHandler);
  99     viewer.addEventHandler(new osgViewer::ThreadingHandler);
 100     viewer.addEventHandler(new osgViewer::LODScaleHandler);
 101     viewer.addEventHandler(new osgViewer::ScreenCaptureHandler);
 102     viewer.addEventHandler(new osgViewer::WindowSizeHandler);
 103
 104     // Sigh, we need our own cull visitor ...
 105     osg::Camera* camera = viewer.getCamera();
 106     osgViewer::Renderer* renderer = static_cast<osgViewer::Renderer*>(camera->getRenderer());
 107     for (int j = 0; j < 2; ++j) {
 108         osgUtil::SceneView* sceneView = renderer->getSceneView(j);
 109         sceneView->setCullVisitor(new simgear::EffectCullVisitor);
 110     }
 111     // Shaders expect valid fog
 112     osg::Fog* fog = new osg::Fog;
 113     fog->setMode(osg::Fog::EXP2);
 114     fog->setColor(osg::Vec4(1, 1, 1, 1));
 115     fog->setDensity(1e-6);
 116     camera->getOrCreateStateSet()->setAttribute(fog);
 117
 118     std::string fg_root;
 119     if (arguments.read("--fg-root", fg_root)) {
 120     } else if (const char *fg_root_env = std::getenv("FG_ROOT")) {
 121         fg_root = fg_root_env;
 122     } else {
 123 #if defined(PKGLIBDIR)
 124         fg_root = PKGLIBDIR;
 125 #else
 126         fg_root = ".";
 127 #endif
 128     }
 129
 130     std::string fg_scenery;
 131     if (arguments.read("--fg-scenery", fg_scenery)) {
 132     } else if (const char *fg_scenery_env = std::getenv("FG_SCENERY")) {
 133         fg_scenery = fg_scenery_env;
 134     } else {
 135         SGPath path(fg_root);
 136         path.append("Scenery");
 137         fg_scenery = path.str();
 138     }
 139     string_list path_list = sgPathSplit(fg_scenery);
 140     osgDB::FilePathList filePathList;
 141     filePathList.push_back(fg_root);
 142     for (unsigned i = 0; i < path_list.size(); ++i) {
 143         SGPath pt(path_list[i]), po(path_list[i]);
 144         pt.append("Terrain");
 145         po.append("Objects");
 146         filePathList.push_back(path_list[i]);
 147         filePathList.push_back(pt.str());
 148         filePathList.push_back(po.str());
 149     }
 150
 151     SGSharedPtr<SGPropertyNode> props = new SGPropertyNode;
 152     sgUserDataInit(props.get());
 153     try {
 154         SGPath preferencesFile = fg_root;
 155         preferencesFile.append("preferences.xml");
 156         readProperties(preferencesFile.str(), props);
 157     } catch (...) {
 158         // In case of an error, at least make summer :)
 159         props->getNode("sim/startup/season", true)->setStringValue("summer");
 160
 161         std::cerr << "Problems loading FlightGear preferences.\n"
 162                   << "Probably FG_ROOT is not properly set." << std::endl;
 163     }
 164     SGMaterialLib* ml = new SGMaterialLib;
 165     SGPath mpath(fg_root);
 166     mpath.append("materials.xml");
 167     try {
 168         ml->load(fg_root, mpath.str(), props);
 169     } catch (...) {
 170         std::cerr << "Problems loading FlightGear materials.\n"
 171                   << "Probably FG_ROOT is not properly set." << std::endl;
 172     }
 173     simgear::SGModelLib::init(fg_root, props);
 174
 175     // Set up the reader/writer options
 176     osg::ref_ptr<simgear::SGReaderWriterOptions> options;
 177     if (osgDB::Options* ropt = osgDB::Registry::instance()->getOptions())
 178         options = new simgear::SGReaderWriterOptions(*ropt);
 179     else
 180         options = new simgear::SGReaderWriterOptions;
 181     options->getDatabasePathList() = filePathList;
 182     options->setMaterialLib(ml);
 183     options->setPropertyNode(props);
 184     options->setPluginStringData("SimGear::FG_ROOT", fg_root);
 185     options->setPluginStringData("SimGear::FG_SCENERY", fg_scenery);
 186     osgDB::Registry::instance()->setOptions(options.get());
 187
 188     // Here, all arguments are processed
 189     arguments.reportRemainingOptionsAsUnrecognized();
 190     arguments.writeErrorMessages(std::cerr);
 191
 192     // read the scene from the list of file specified command line args.
 193     osg::ref_ptr<osg::Node> loadedModel;
 194     loadedModel = osgDB::readNodeFiles(arguments, options.get());
 195
 196     // if no model has been successfully loaded report failure.
 197     if (!loadedModel.valid()) {
 198         std::cerr << arguments.getApplicationName()
 199                   << ": No data loaded" << std::endl;
 200         return EXIT_FAILURE;
 201     }
 202
 203     // pass the loaded scene graph to the viewer.
 204     viewer.setSceneData(loadedModel.get());
 205
 206     // We want on demand database paging
 207     viewer.setDatabasePager(new osgDB::DatabasePager);
 208     viewer.getDatabasePager()->setUpThreads(1, 1);
 209
 210     return viewer.run();
 211 }