src/Main/main.cxx

   1 // main.cxx -- top level sim routines
   2 //
   3 // Written by Curtis Olson, started May 1997.
   4 //
   5 // Copyright (C) 1997 - 2002  Curtis L. Olson  - http://www.flightgear.org/~curt
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  20 //
  21 // $Id$
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include <config.h>
  26 #endif
  27
  28 #include <simgear/compiler.h>
  29
  30 #if defined(__linux__) && defined(__i386__)
  31 #  include <fpu_control.h>
  32 #  include <signal.h>
  33 #endif
  34
  35 #include <iostream>
  36
  37 #include <osg/Camera>
  38 #include <osg/GraphicsContext>
  39 #include <osgDB/Registry>
  40
  41 // Class references
  42 #include <simgear/scene/model/modellib.hxx>
  43 #include <simgear/scene/material/matlib.hxx>
  44 #include <simgear/scene/model/animation.hxx>
  45 #include <simgear/scene/sky/sky.hxx>
  46 #include <simgear/structure/event_mgr.hxx>
  47 #include <simgear/props/AtomicChangeListener.hxx>
  48 #include <simgear/props/props.hxx>
  49 #include <simgear/timing/sg_time.hxx>
  50 #include <simgear/magvar/magvar.hxx>
  51 #include <simgear/math/sg_random.h>
  52 #include <simgear/io/raw_socket.hxx>
  53 #include <simgear/scene/tsync/terrasync.hxx>
  54 #include <simgear/misc/sg_sleep.hxx>
  55
  56 #include <Time/light.hxx>
  57 #include <Aircraft/replay.hxx>
  58 #include <Aircraft/controls.hxx>
  59 #include <Model/panelnode.hxx>
  60 #include <Model/acmodel.hxx>
  61 #include <Scenery/scenery.hxx>
  62 #include <Scenery/tilemgr.hxx>
  63 #include <Sound/fg_fx.hxx>
  64 #include <Sound/beacon.hxx>
  65 #include <Sound/morse.hxx>
  66 #include <Sound/fg_fx.hxx>
  67 #include <ATCDCL/ATCmgr.hxx>
  68 #include <Time/TimeManager.hxx>
  69 #include <Environment/environment_mgr.hxx>
  70 #include <Environment/ephemeris.hxx>
  71 #include <GUI/gui.h>
  72 #include <GUI/new_gui.hxx>
  73 #include <MultiPlayer/multiplaymgr.hxx>
  74
  75 #include "CameraGroup.hxx"
  76 #include "fg_commands.hxx"
  77 #include "fg_io.hxx"
  78 #include "renderer.hxx"
  79 #include "splash.hxx"
  80 #include "main.hxx"
  81 #include "util.hxx"
  82 #include "fg_init.hxx"
  83 #include "fg_os.hxx"
  84 #include "WindowSystemAdapter.hxx"
  85 #include <Main/viewer.hxx>
  86
  87
  88 using namespace flightgear;
  89
  90 using std::cerr;
  91
  92 // Specify our current idle function state.  This is used to run all
  93 // our initializations out of the idle callback so that we can get a
  94 // splash screen up and running right away.
  95 int idle_state = 0;
  96
  97
  98 void fgInitSoundManager();
  99 void fgSetNewSoundDevice(const char *);
 100
 101 // The atexit() function handler should know when the graphical subsystem
 102 // is initialized.
 103 extern int _bootstrap_OSInit;
 104
 105 // What should we do when we have nothing else to do?  Let's get ready
 106 // for the next move and update the display?
 107 static void fgMainLoop( void ) {
 108
 109     static SGConstPropertyNode_ptr longitude
 110         = fgGetNode("/position/longitude-deg");
 111     static SGConstPropertyNode_ptr latitude
 112         = fgGetNode("/position/latitude-deg");
 113     static SGConstPropertyNode_ptr altitude
 114         = fgGetNode("/position/altitude-ft");
 115     static SGConstPropertyNode_ptr vn_fps
 116         = fgGetNode("/velocities/speed-north-fps");
 117     static SGConstPropertyNode_ptr ve_fps
 118         = fgGetNode("/velocities/speed-east-fps");
 119     static SGConstPropertyNode_ptr vd_fps
 120         = fgGetNode("/velocities/speed-down-fps");
 121
 122     static SGPropertyNode_ptr frame_signal
 123         = fgGetNode("/sim/signals/frame", true);
 124
 125     static SGPropertyNode_ptr _statisticsFlag
 126         = fgGetNode("/sim/timing-statistics/enabled", true);
 127     static SGPropertyNode_ptr _statisticsInterval
 128         = fgGetNode("/sim/timing-statistics/interval-s", true);
 129     static SGPropertyNode_ptr _statiticsMinJitter
 130         = fgGetNode("/sim/timing-statistics/min-jitter-ms", true);
 131     static SGPropertyNode_ptr _statiticsMinTime
 132         = fgGetNode("/sim/timing-statistics/min-time-ms", true);
 133
 134     frame_signal->fireValueChanged();
 135     SGCloudLayer::enable_bump_mapping = fgGetBool("/sim/rendering/bump-mapping");
 136
 137     SG_LOG( SG_GENERAL, SG_DEBUG, "Running Main Loop");
 138     SG_LOG( SG_GENERAL, SG_DEBUG, "======= ==== ====");
 139
 140
 141   // update "time"
 142     double sim_dt, real_dt;
 143     TimeManager* timeMgr = (TimeManager*) globals->get_subsystem("time");
 144     // compute simulated time (allowing for pause, warp, etc) and
 145     // real elapsed time
 146     timeMgr->computeTimeDeltas(sim_dt, real_dt);
 147
 148     // update magvar model
 149     globals->get_mag()->update( longitude->getDoubleValue()
 150                                 * SGD_DEGREES_TO_RADIANS,
 151                                 latitude->getDoubleValue()
 152                                 * SGD_DEGREES_TO_RADIANS,
 153                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
 154                                 globals->get_time_params()->getJD() );
 155
 156     // Run ATC subsystem
 157     globals->get_ATC_mgr()->update(sim_dt);
 158
 159     globals->get_subsystem_mgr()->update(sim_dt);
 160
 161     // Update the sound manager last so it can use the CPU while the GPU
 162     // is processing the scenery (doubled the frame-rate for me) -EMH-
 163 #ifdef ENABLE_AUDIO_SUPPORT
 164     static bool smgr_init = true;
 165     static SGPropertyNode *sound_working = fgGetNode("/sim/sound/working");
 166     if (smgr_init == true) {
 167         if (sound_working->getBoolValue() == true) {
 168             fgInitSoundManager();
 169             smgr_init = false;
 170         }
 171     } else {
 172         static SGPropertyNode *sound_enabled = fgGetNode("/sim/sound/enabled");
 173         static SGSoundMgr *smgr = globals->get_soundmgr();
 174         static bool smgr_enabled = true;
 175
 176         if (sound_working->getBoolValue() == false) {   // request to reinit
 177            smgr->reinit();
 178            smgr->resume();
 179            sound_working->setBoolValue(true);
 180         }
 181
 182         if (smgr_enabled != sound_enabled->getBoolValue()) {
 183             if (smgr_enabled == true) { // request to suspend
 184                 smgr->suspend();
 185                 smgr_enabled = false;
 186             } else {
 187                 smgr->resume();
 188                 smgr_enabled = true;
 189             }
 190         }
 191
 192         if (smgr_enabled == true) {
 193             static SGPropertyNode *volume = fgGetNode("/sim/sound/volume");
 194             smgr->set_volume(volume->getFloatValue());
 195             smgr->update(sim_dt);
 196         }
 197     }
 198 #endif
 199
 200     // END Tile Manager updates
 201     bool scenery_loaded = fgGetBool("sim/sceneryloaded");
 202     if (!scenery_loaded)
 203     {
 204         if (globals->get_tile_mgr()->isSceneryLoaded()
 205              && fgGetBool("sim/fdm-initialized")) {
 206             fgSetBool("sim/sceneryloaded",true);
 207             fgSplashProgress("");
 208             if (fgGetBool("/sim/sound/working")) {
 209                 globals->get_soundmgr()->activate();
 210             }
 211             globals->get_props()->tie("/sim/sound/devices/name",
 212                   SGRawValueFunctions<const char *>(0, fgSetNewSoundDevice), false);
 213         }
 214         else
 215         {
 216             fgSplashProgress("loading scenery");
 217             // be nice to loader threads while waiting for initial scenery, reduce to 2fps
 218             simgear::sleepForMSec(500);
 219         }
 220     }
 221
 222     // print timing statistics
 223     static bool _lastStatisticsFlag = false;
 224     if (_lastStatisticsFlag != _statisticsFlag->getBoolValue())
 225     {
 226         // flag has changed, update subsystem manager
 227         _lastStatisticsFlag = _statisticsFlag->getBoolValue();
 228         globals->get_subsystem_mgr()->collectDebugTiming(_lastStatisticsFlag);
 229     }
 230     if (_lastStatisticsFlag)
 231     {
 232         static double elapsed = 0;
 233         elapsed += real_dt;
 234         if (elapsed >= _statisticsInterval->getDoubleValue())
 235         {
 236             // print and reset timing statistics
 237             globals->get_subsystem_mgr()->printTimingStatistics(_statiticsMinTime->getDoubleValue(),
 238                                                                 _statiticsMinJitter->getDoubleValue());
 239             elapsed = 0;
 240         }
 241     }
 242
 243     simgear::AtomicChangeListener::fireChangeListeners();
 244
 245     SG_LOG( SG_GENERAL, SG_DEBUG, "" );
 246 }
 247
 248 void fgInitSoundManager()
 249 {
 250     SGSoundMgr *smgr = globals->get_soundmgr();
 251
 252     smgr->bind();
 253     smgr->init(fgGetString("/sim/sound/device-name", NULL));
 254
 255     vector <const char*>devices = smgr->get_available_devices();
 256     for (unsigned int i=0; i<devices.size(); i++) {
 257         SGPropertyNode *p = fgGetNode("/sim/sound/devices/device", i, true);
 258         p->setStringValue(devices[i]);
 259     }
 260     devices.clear();
 261 }
 262
 263 void fgSetNewSoundDevice(const char *device)
 264 {
 265     globals->get_soundmgr()->suspend();
 266     globals->get_soundmgr()->stop();
 267     globals->get_soundmgr()->init(device);
 268     globals->get_soundmgr()->resume();
 269 }
 270
 271 // Operation for querying OpenGL parameters. This must be done in a
 272 // valid OpenGL context, potentially in another thread.
 273 namespace
 274 {
 275 struct GeneralInitOperation : public GraphicsContextOperation
 276 {
 277     GeneralInitOperation()
 278         : GraphicsContextOperation(std::string("General init"))
 279     {
 280     }
 281     void run(osg::GraphicsContext* gc)
 282     {
 283         SGPropertyNode* simRendering = fgGetNode("/sim/rendering");
 284
 285         simRendering->setStringValue("gl-vendor", (char*) glGetString(GL_VENDOR));
 286         SG_LOG( SG_GENERAL, SG_INFO, glGetString(GL_VENDOR));
 287
 288         simRendering->setStringValue("gl-renderer", (char*) glGetString(GL_RENDERER));
 289         SG_LOG( SG_GENERAL, SG_INFO, glGetString(GL_RENDERER));
 290
 291         simRendering->setStringValue("gl-version", (char*) glGetString(GL_VERSION));
 292         SG_LOG( SG_GENERAL, SG_INFO, glGetString(GL_VERSION));
 293
 294         GLint tmp;
 295         glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
 296         simRendering->setIntValue("max-texture-size", tmp);
 297
 298         glGetIntegerv( GL_DEPTH_BITS, &tmp );
 299         simRendering->setIntValue("depth-buffer-bits", tmp);
 300     }
 301 };
 302
 303
 304 osg::Node* load_panel(SGPropertyNode *n)
 305 {
 306     osg::Geode* geode = new osg::Geode;
 307     geode->addDrawable(new FGPanelNode(n));
 308     return geode;
 309 }
 310
 311 SGPath resolve_path(const std::string& s)
 312 {
 313   return globals->resolve_maybe_aircraft_path(s);
 314 }
 315
 316 }
 317
 318 // This is the top level master main function that is registered as
 319 // our idle function
 320
 321 // The first few passes take care of initialization things (a couple
 322 // per pass) and once everything has been initialized fgMainLoop from
 323 // then on.
 324
 325 static void fgIdleFunction ( void ) {
 326     static osg::ref_ptr<GeneralInitOperation> genOp;
 327     if ( idle_state == 0 ) {
 328         idle_state++;
 329         // Pick some window on which to do queries.
 330         // XXX Perhaps all this graphics initialization code should be
 331         // moved to renderer.cxx?
 332         genOp = new GeneralInitOperation;
 333         osg::Camera* guiCamera = getGUICamera(CameraGroup::getDefault());
 334         WindowSystemAdapter* wsa = WindowSystemAdapter::getWSA();
 335         osg::GraphicsContext* gc = 0;
 336         if (guiCamera)
 337             gc = guiCamera->getGraphicsContext();
 338         if (gc) {
 339             gc->add(genOp.get());
 340         } else {
 341             wsa->windows[0]->gc->add(genOp.get());
 342         }
 343         guiStartInit(gc);
 344     } else if ( idle_state == 1 ) {
 345         if (genOp.valid()) {
 346             if (!genOp->isFinished())
 347                 return;
 348             genOp = 0;
 349         }
 350         if (!guiFinishInit())
 351             return;
 352         idle_state++;
 353         fgSplashProgress("loading aircraft list");
 354
 355     } else if ( idle_state == 2 ) {
 356         idle_state++;
 357         fgSplashProgress("loading navigation data");
 358
 359     } else if ( idle_state == 3 ) {
 360         idle_state++;
 361         fgInitNav();
 362
 363         fgSplashProgress("initializing scenery system");
 364
 365     } else if ( idle_state == 4 ) {
 366         idle_state++;
 367         // based on the requested presets, calculate the true starting
 368         // lon, lat
 369         fgInitPosition();
 370         fgInitTowerLocationListener();
 371
 372         TimeManager* t = new TimeManager;
 373         globals->add_subsystem("time", t, SGSubsystemMgr::INIT);
 374         t->init(); // need to init now, not during initSubsystems
 375
 376         // Do some quick general initializations
 377         if( !fgInitGeneral()) {
 378             SG_LOG( SG_GENERAL, SG_ALERT,
 379                 "General initialization failed ..." );
 380             exit(-1);
 381         }
 382
 383         ////////////////////////////////////////////////////////////////////
 384         // Initialize the property-based built-in commands
 385         ////////////////////////////////////////////////////////////////////
 386         fgInitCommands();
 387
 388         ////////////////////////////////////////////////////////////////////
 389         // Initialize the material manager
 390         ////////////////////////////////////////////////////////////////////
 391         globals->set_matlib( new SGMaterialLib );
 392         simgear::SGModelLib::init(globals->get_fg_root(), globals->get_props());
 393         simgear::SGModelLib::setPanelFunc(load_panel);
 394
 395         ////////////////////////////////////////////////////////////////////
 396         // Initialize the TG scenery subsystem.
 397         ////////////////////////////////////////////////////////////////////
 398         simgear::SGTerraSync* terra_sync = new simgear::SGTerraSync(globals->get_props());
 399         globals->add_subsystem("terrasync", terra_sync);
 400         globals->set_scenery( new FGScenery );
 401         globals->get_scenery()->init();
 402         globals->get_scenery()->bind();
 403         globals->set_tile_mgr( new FGTileMgr );
 404
 405         fgSplashProgress("loading aircraft");
 406
 407     } else if ( idle_state == 5 ) {
 408         idle_state++;
 409
 410         fgSplashProgress("initializing sky elements");
 411
 412     } else if ( idle_state == 6 ) {
 413         idle_state++;
 414         // Initialize the sky
 415
 416         Ephemeris* eph = new Ephemeris;
 417         globals->add_subsystem("ephemeris", eph);
 418         eph->init(); // FIXME - remove this once SGSky code below is also a subsystem
 419         eph->bind();
 420
 421         // TODO: move to environment mgr
 422         thesky = new SGSky;
 423         SGPath texture_path(globals->get_fg_root());
 424         texture_path.append("Textures");
 425         texture_path.append("Sky");
 426         for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
 427             SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
 428             thesky->add_cloud_layer(layer);
 429         }
 430
 431         SGPath sky_tex_path( globals->get_fg_root() );
 432         sky_tex_path.append( "Textures" );
 433         sky_tex_path.append( "Sky" );
 434         thesky->texture_path( sky_tex_path.str() );
 435
 436         // The sun and moon diameters are scaled down numbers of the
 437         // actual diameters. This was needed to fit both the sun and the
 438         // moon within the distance to the far clip plane.
 439         // Moon diameter:    3,476 kilometers
 440         // Sun diameter: 1,390,000 kilometers
 441         thesky->build( 80000.0, 80000.0,
 442                        463.3, 361.8,
 443                        *globals->get_ephem(),
 444                        fgGetNode("/environment", true));
 445
 446         // Initialize MagVar model
 447         SGMagVar *magvar = new SGMagVar();
 448         globals->set_mag( magvar );
 449
 450
 451                                     // kludge to initialize mag compass
 452                                     // (should only be done for in-flight
 453                                     // startup)
 454         // update magvar model
 455         globals->get_mag()->update( fgGetDouble("/position/longitude-deg")
 456                                     * SGD_DEGREES_TO_RADIANS,
 457                                     fgGetDouble("/position/latitude-deg")
 458                                     * SGD_DEGREES_TO_RADIANS,
 459                                     fgGetDouble("/position/altitude-ft")
 460                                     * SG_FEET_TO_METER,
 461                                     globals->get_time_params()->getJD() );
 462         double var = globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES;
 463         fgSetDouble("/instrumentation/heading-indicator/offset-deg", -var);
 464         fgSetDouble("/instrumentation/heading-indicator-fg/offset-deg", -var);
 465
 466
 467         // airport = new ssgBranch;
 468         // airport->setName( "Airport Lighting" );
 469         // lighting->addKid( airport );
 470
 471         fgSplashProgress("initializing subsystems");
 472
 473     } else if ( idle_state == 7 ) {
 474         idle_state++;
 475         // Initialize audio support
 476 #ifdef ENABLE_AUDIO_SUPPORT
 477
 478         // Start the intro music
 479         if ( fgGetBool("/sim/startup/intro-music") ) {
 480             SGPath mp3file( globals->get_fg_root() );
 481             mp3file.append( "Sounds/intro.mp3" );
 482
 483             SG_LOG( SG_GENERAL, SG_INFO,
 484                 "Starting intro music: " << mp3file.str() );
 485
 486 # if defined( __CYGWIN__ )
 487             string command = "start /m `cygpath -w " + mp3file.str() + "`";
 488 # elif defined( _WIN32 )
 489             string command = "start /m " + mp3file.str();
 490 # else
 491             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
 492 # endif
 493
 494             system ( command.c_str() );
 495         }
 496 #endif
 497         // This is the top level init routine which calls all the
 498         // other subsystem initialization routines.  If you are adding
 499         // a subsystem to flightgear, its initialization call should be
 500         // located in this routine.
 501         if( !fgInitSubsystems()) {
 502             SG_LOG( SG_GENERAL, SG_ALERT,
 503                 "Subsystem initialization failed ..." );
 504             exit(-1);
 505         }
 506
 507         // Torsten Dreyer:
 508         // ugly hack for automatic runway selection on startup based on
 509         // metar data. Makes startup.nas obsolete and guarantees the same
 510         // runway selection as for AI traffic. However, this code belongs to
 511         // somewhere(?) else - if I only new where...
 512         if( true == fgGetBool( "/environment/metar/valid" ) ) {
 513             // the realwx_ctrl fetches metar in the foreground on init,
 514             // If it was able to fetch a metar or one was given on the commandline,
 515             // the valid flag is set here, otherwise it is false
 516             double hdg = fgGetDouble( "/environment/metar/base-wind-dir-deg", 9999.0 );
 517             string apt = fgGetString( "/sim/startup/options/airport" );
 518             string rwy = fgGetString( "/sim/startup/options/runway" );
 519             double strthdg = fgGetDouble( "/sim/startup/options/heading-deg", 9999.0 );
 520             string parkpos = fgGetString( "/sim/presets/parkpos" );
 521             bool onground = fgGetBool( "/sim/presets/onground", false );
 522             // don't check for wind-speed < 1kt, this belongs to the runway-selection code
 523             // the other logic is taken from former startup.nas
 524             if( hdg < 360.0 && apt.length() > 0 && strthdg > 360.0 && rwy.length() == 0 && onground && parkpos.length() == 0 ) {
 525                 extern bool fgSetPosFromAirportIDandHdg( const string& id, double tgt_hdg );
 526                 fgSetPosFromAirportIDandHdg( apt, hdg );
 527             }
 528         }
 529
 530         fgSplashProgress("initializing graphics engine");
 531
 532     } else if ( idle_state == 8 ) {
 533         idle_state = 1000;
 534
 535         // setup OpenGL view parameters
 536         globals->get_renderer()->setupView();
 537
 538         globals->get_renderer()->resize( fgGetInt("/sim/startup/xsize"),
 539                                          fgGetInt("/sim/startup/ysize") );
 540
 541         int session = fgGetInt("/sim/session",0);
 542         session++;
 543         fgSetInt("/sim/session",session);
 544     }
 545
 546     if ( idle_state == 1000 ) {
 547         // We've finished all our initialization steps, from now on we
 548         // run the main loop.
 549         fgSetBool("sim/sceneryloaded", false);
 550         fgRegisterIdleHandler( fgMainLoop );
 551     }
 552 }
 553
 554 static void upper_case_property(const char *name)
 555 {
 556     using namespace simgear;
 557     SGPropertyNode *p = fgGetNode(name, false);
 558     if (!p) {
 559         p = fgGetNode(name, true);
 560         p->setStringValue("");
 561     } else {
 562         props::Type t = p->getType();
 563         if (t == props::NONE || t == props::UNSPECIFIED)
 564             p->setStringValue("");
 565         else
 566             assert(t == props::STRING);
 567     }
 568     p->addChangeListener(new FGMakeUpperCase);
 569 }
 570
 571
 572 // Main top level initialization
 573 int fgMainInit( int argc, char **argv ) {
 574
 575     // set default log levels
 576     sglog().setLogLevels( SG_ALL, SG_ALERT );
 577
 578     string version;
 579 #ifdef FLIGHTGEAR_VERSION
 580     version = FLIGHTGEAR_VERSION;
 581 #else
 582     version = "unknown version";
 583 #endif
 584     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
 585             << version );
 586     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
 587
 588     // Allocate global data structures.  This needs to happen before
 589     // we parse command line options
 590
 591     globals = new FGGlobals;
 592
 593     // seed the random number generator
 594     sg_srandom_time();
 595
 596     FGControls *controls = new FGControls;
 597     globals->set_controls( controls );
 598
 599     string_list *col = new string_list;
 600     globals->set_channel_options_list( col );
 601
 602     fgValidatePath("", false);  // initialize static variables
 603     upper_case_property("/sim/presets/airport-id");
 604     upper_case_property("/sim/presets/runway");
 605     upper_case_property("/sim/tower/airport-id");
 606     upper_case_property("/autopilot/route-manager/input");
 607
 608     // Scan the config file(s) and command line options to see if
 609     // fg_root was specified (ignore all other options for now)
 610     fgInitFGRoot(argc, argv);
 611
 612     // Check for the correct base package version
 613     static char required_version[] = "2.5.0";
 614     string base_version = fgBasePackageVersion();
 615     if ( !(base_version == required_version) ) {
 616         // tell the operator how to use this application
 617
 618         SG_LOG( SG_GENERAL, SG_ALERT, "" ); // To popup the console on windows
 619         cerr << endl << "Base package check failed:" << endl \
 620              << "  Version " << base_version << " found at: " \
 621              << globals->get_fg_root() << endl \
 622              << "  Version " << required_version << " is required." << endl \
 623              << "Please upgrade/downgrade base package and set the path to your fgdata" << endl \
 624              << "with --fg-root=path_to_your_fgdata" << endl;
 625 #ifdef _MSC_VER
 626         cerr << "Hit a key to continue..." << endl;
 627         cin.get();
 628 #endif
 629         exit(-1);
 630     }
 631
 632     // Load the configuration parameters.  (Command line options
 633     // override config file options.  Config file options override
 634     // defaults.)
 635     if ( !fgInitConfig(argc, argv) ) {
 636         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
 637         exit(-1);
 638     }
 639
 640     // Initialize the Window/Graphics environment.
 641     fgOSInit(&argc, argv);
 642     _bootstrap_OSInit++;
 643
 644     fgRegisterIdleHandler( &fgIdleFunction );
 645
 646     // Initialize sockets (WinSock needs this)
 647     simgear::Socket::initSockets();
 648
 649     // Clouds3D requires an alpha channel
 650     fgOSOpenWindow(true /* request stencil buffer */);
 651
 652     // Initialize the splash screen right away
 653     fntInit();
 654     fgSplashInit();
 655
 656     // pass control off to the master event handler
 657     int result = fgOSMainLoop();
 658
 659     // clean up here; ensure we null globals to avoid
 660     // confusing the atexit() handler
 661     delete globals;
 662     globals = NULL;
 663
 664     return result;
 665 }