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/math/sg_random.h>
  51 #include <simgear/io/raw_socket.hxx>
  52 #include <simgear/misc/sg_sleep.hxx>
  53
  54 #include <Time/light.hxx>
  55 #include <Aircraft/replay.hxx>
  56 #include <Aircraft/controls.hxx>
  57 #include <Model/panelnode.hxx>
  58 #include <Model/acmodel.hxx>
  59 #include <Scenery/scenery.hxx>
  60 #include <Scenery/tilemgr.hxx>
  61 #include <Sound/fg_fx.hxx>
  62 #include <Sound/beacon.hxx>
  63 #include <Sound/morse.hxx>
  64 #include <Sound/fg_fx.hxx>
  65 #include <ATCDCL/ATCmgr.hxx>
  66 #include <Time/TimeManager.hxx>
  67 #include <Environment/environment_mgr.hxx>
  68 #include <Environment/ephemeris.hxx>
  69 #include <GUI/new_gui.hxx>
  70 #include <MultiPlayer/multiplaymgr.hxx>
  71
  72 #include "CameraGroup.hxx"
  73 #include "fg_commands.hxx"
  74 #include "fg_io.hxx"
  75 #include "renderer.hxx"
  76 #include "splash.hxx"
  77 #include "main.hxx"
  78 #include "util.hxx"
  79 #include "fg_init.hxx"
  80 #include "fg_os.hxx"
  81 #include "WindowSystemAdapter.hxx"
  82 #include <Main/viewer.hxx>
  83
  84
  85 using namespace flightgear;
  86
  87 using std::cerr;
  88
  89 // Specify our current idle function state.  This is used to run all
  90 // our initializations out of the idle callback so that we can get a
  91 // splash screen up and running right away.
  92 int idle_state = 0;
  93
  94
  95 void fgInitSoundManager();
  96 void fgSetNewSoundDevice(const char *);
  97
  98 // The atexit() function handler should know when the graphical subsystem
  99 // is initialized.
 100 extern int _bootstrap_OSInit;
 101
 102 // What should we do when we have nothing else to do?  Let's get ready
 103 // for the next move and update the display?
 104 static void fgMainLoop( void ) {
 105
 106     static SGConstPropertyNode_ptr longitude
 107         = fgGetNode("/position/longitude-deg");
 108     static SGConstPropertyNode_ptr latitude
 109         = fgGetNode("/position/latitude-deg");
 110     static SGConstPropertyNode_ptr altitude
 111         = fgGetNode("/position/altitude-ft");
 112     static SGConstPropertyNode_ptr vn_fps
 113         = fgGetNode("/velocities/speed-north-fps");
 114     static SGConstPropertyNode_ptr ve_fps
 115         = fgGetNode("/velocities/speed-east-fps");
 116     static SGConstPropertyNode_ptr vd_fps
 117         = fgGetNode("/velocities/speed-down-fps");
 118
 119     static SGPropertyNode_ptr frame_signal
 120         = fgGetNode("/sim/signals/frame", true);
 121
 122     frame_signal->fireValueChanged();
 123     SGCloudLayer::enable_bump_mapping = fgGetBool("/sim/rendering/bump-mapping");
 124
 125     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 126     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 127
 128
 129   // update "time"
 130     double sim_dt, real_dt;
 131     TimeManager* timeMgr = (TimeManager*) globals->get_subsystem("time");
 132     // compute simulated time (allowing for pause, warp, etc) and
 133     // real elapsed time
 134     timeMgr->computeTimeDeltas(sim_dt, real_dt);
 135
 136     // update magvar model
 137     globals->get_mag()->update( longitude->getDoubleValue()
 138                                 * SGD_DEGREES_TO_RADIANS,
 139                                 latitude->getDoubleValue()
 140                                 * SGD_DEGREES_TO_RADIANS,
 141                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
 142                                 globals->get_time_params()->getJD() );
 143
 144 #if ENABLE_ATCDCL
 145     // Run ATC subsystem
 146     if (fgGetBool("/sim/atc/enabled"))
 147         globals->get_ATC_mgr()->update(sim_dt);
 148 #endif
 149
 150     globals->get_subsystem_mgr()->update(sim_dt);
 151
 152     // Update the sound manager last so it can use the CPU while the GPU
 153     // is processing the scenery (doubled the frame-rate for me) -EMH-
 154 #ifdef ENABLE_AUDIO_SUPPORT
 155     static bool smgr_init = true;
 156     static SGPropertyNode *sound_working = fgGetNode("/sim/sound/working");
 157     if (smgr_init == true) {
 158         if (sound_working->getBoolValue() == true) {
 159             fgInitSoundManager();
 160             smgr_init = false;
 161         }
 162     } else {
 163         static SGPropertyNode *sound_enabled = fgGetNode("/sim/sound/enabled");
 164         static SGSoundMgr *smgr = globals->get_soundmgr();
 165         static bool smgr_enabled = true;
 166
 167         if (sound_working->getBoolValue() == false) {   // request to reinit
 168            smgr->reinit();
 169            smgr->resume();
 170            sound_working->setBoolValue(true);
 171         }
 172
 173         if (smgr_enabled != sound_enabled->getBoolValue()) {
 174             if (smgr_enabled == true) { // request to suspend
 175                 smgr->suspend();
 176                 smgr_enabled = false;
 177             } else {
 178                 smgr->resume();
 179                 smgr_enabled = true;
 180             }
 181         }
 182
 183         if (smgr_enabled == true) {
 184             static SGPropertyNode *volume = fgGetNode("/sim/sound/volume");
 185             smgr->set_volume(volume->getFloatValue());
 186             smgr->update(sim_dt);
 187         }
 188     }
 189 #endif
 190
 191     // END Tile Manager updates
 192     bool scenery_loaded = fgGetBool("sim/sceneryloaded");
 193     if (!scenery_loaded)
 194     {
 195         if (globals->get_tile_mgr()->isSceneryLoaded()
 196              && fgGetBool("sim/fdm-initialized")) {
 197             fgSetBool("sim/sceneryloaded",true);
 198             if (fgGetBool("/sim/sound/working")) {
 199                 globals->get_soundmgr()->activate();
 200             }
 201             globals->get_props()->tie("/sim/sound/devices/name",
 202                   SGRawValueFunctions<const char *>(0, fgSetNewSoundDevice), false);
 203         }
 204         else
 205         {
 206             // be nice to loader threads while waiting for initial scenery, reduce to 2fps
 207             simgear::sleepForMSec(500);
 208         }
 209     }
 210     simgear::AtomicChangeListener::fireChangeListeners();
 211
 212     SG_LOG( SG_ALL, SG_DEBUG, "" );
 213 }
 214
 215 void fgInitSoundManager()
 216 {
 217     SGSoundMgr *smgr = globals->get_soundmgr();
 218
 219     smgr->bind();
 220     smgr->init(fgGetString("/sim/sound/device-name", NULL));
 221
 222     vector <const char*>devices = smgr->get_available_devices();
 223     for (unsigned int i=0; i<devices.size(); i++) {
 224         SGPropertyNode *p = fgGetNode("/sim/sound/devices/device", i, true);
 225         p->setStringValue(devices[i]);
 226     }
 227     devices.clear();
 228 }
 229
 230 void fgSetNewSoundDevice(const char *device)
 231 {
 232     globals->get_soundmgr()->suspend();
 233     globals->get_soundmgr()->stop();
 234     globals->get_soundmgr()->init(device);
 235     globals->get_soundmgr()->resume();
 236 }
 237
 238 // Operation for querying OpenGL parameters. This must be done in a
 239 // valid OpenGL context, potentially in another thread.
 240 namespace
 241 {
 242 struct GeneralInitOperation : public GraphicsContextOperation
 243 {
 244     GeneralInitOperation()
 245         : GraphicsContextOperation(std::string("General init"))
 246     {
 247     }
 248     void run(osg::GraphicsContext* gc)
 249     {
 250         SGPropertyNode* simRendering = fgGetNode("/sim/rendering");
 251
 252         simRendering->setStringValue("gl-vendor", (char*) glGetString(GL_VENDOR));
 253         SG_LOG( SG_GENERAL, SG_INFO, glGetString(GL_VENDOR));
 254
 255         simRendering->setStringValue("gl-renderer", (char*) glGetString(GL_RENDERER));
 256         SG_LOG( SG_GENERAL, SG_INFO, glGetString(GL_RENDERER));
 257
 258         simRendering->setStringValue("gl-version", (char*) glGetString(GL_VERSION));
 259         SG_LOG( SG_GENERAL, SG_INFO, glGetString(GL_VERSION));
 260
 261         GLint tmp;
 262         glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
 263         simRendering->setIntValue("max-texture-size", tmp);
 264
 265         glGetIntegerv( GL_DEPTH_BITS, &tmp );
 266         simRendering->setIntValue("depth-buffer-bits", tmp);
 267     }
 268 };
 269
 270
 271 osg::Node* load_panel(SGPropertyNode *n)
 272 {
 273     osg::Geode* geode = new osg::Geode;
 274     geode->addDrawable(new FGPanelNode(n));
 275     return geode;
 276 }
 277
 278 SGPath resolve_path(const std::string& s)
 279 {
 280   return globals->resolve_maybe_aircraft_path(s);
 281 }
 282
 283 }
 284
 285 // This is the top level master main function that is registered as
 286 // our idle funciton
 287
 288 // The first few passes take care of initialization things (a couple
 289 // per pass) and once everything has been initialized fgMainLoop from
 290 // then on.
 291
 292 static void fgIdleFunction ( void ) {
 293     static osg::ref_ptr<GeneralInitOperation> genOp;
 294     if ( idle_state == 0 ) {
 295         idle_state++;
 296         // Pick some window on which to do queries.
 297         // XXX Perhaps all this graphics initialization code should be
 298         // moved to renderer.cxx?
 299         genOp = new GeneralInitOperation;
 300         osg::Camera* guiCamera = getGUICamera(CameraGroup::getDefault());
 301         WindowSystemAdapter* wsa = WindowSystemAdapter::getWSA();
 302         osg::GraphicsContext* gc = 0;
 303         if (guiCamera)
 304             gc = guiCamera->getGraphicsContext();
 305         if (gc) {
 306             gc->add(genOp.get());
 307         } else {
 308             wsa->windows[0]->gc->add(genOp.get());
 309         }
 310         guiStartInit(gc);
 311     } else if ( idle_state == 1 ) {
 312         if (genOp.valid()) {
 313             if (!genOp->isFinished())
 314                 return;
 315             genOp = 0;
 316         }
 317         if (!guiFinishInit())
 318             return;
 319         idle_state++;
 320         fgSplashProgress("reading aircraft list");
 321
 322
 323     } else if ( idle_state == 2 ) {
 324         idle_state++;
 325
 326         fgSplashProgress("reading airport & navigation data");
 327
 328
 329     } else if ( idle_state == 3 ) {
 330         idle_state++;
 331         fgInitNav();
 332         fgSplashProgress("setting up scenery");
 333
 334
 335     } else if ( idle_state == 4 ) {
 336         idle_state++;
 337         // based on the requested presets, calculate the true starting
 338         // lon, lat
 339         fgInitPosition();
 340         fgInitTowerLocationListener();
 341
 342         TimeManager* t = new TimeManager;
 343         globals->add_subsystem("time", t, SGSubsystemMgr::INIT);
 344         t->init(); // need to init now, not during initSubsystems
 345
 346         // Do some quick general initializations
 347         if( !fgInitGeneral()) {
 348             SG_LOG( SG_GENERAL, SG_ALERT,
 349                 "General initialization failed ..." );
 350             exit(-1);
 351         }
 352
 353         ////////////////////////////////////////////////////////////////////
 354         // Initialize the property-based built-in commands
 355         ////////////////////////////////////////////////////////////////////
 356         fgInitCommands();
 357
 358
 359         ////////////////////////////////////////////////////////////////////
 360         // Initialize the material manager
 361         ////////////////////////////////////////////////////////////////////
 362         globals->set_matlib( new SGMaterialLib );
 363         simgear::SGModelLib::init(globals->get_fg_root());
 364         simgear::SGModelLib::setPropRoot(globals->get_props());
 365         simgear::SGModelLib::setPanelFunc(load_panel);
 366
 367         ////////////////////////////////////////////////////////////////////
 368         // Initialize the TG scenery subsystem.
 369         ////////////////////////////////////////////////////////////////////
 370         globals->set_scenery( new FGScenery );
 371         globals->get_scenery()->init();
 372         globals->get_scenery()->bind();
 373         globals->set_tile_mgr( new FGTileMgr );
 374
 375
 376         fgSplashProgress("loading aircraft");
 377
 378
 379     } else if ( idle_state == 5 ) {
 380         idle_state++;
 381
 382         fgSplashProgress("generating sky elements");
 383
 384
 385     } else if ( idle_state == 6 ) {
 386         idle_state++;
 387         // Initialize the sky
 388
 389         Ephemeris* eph = new Ephemeris;
 390         globals->add_subsystem("ephemeris", eph);
 391         eph->init(); // FIXME - remove this once SGSky code below is also a subsystem
 392         eph->bind();
 393
 394         // TODO: move to environment mgr
 395         thesky = new SGSky;
 396         SGPath texture_path(globals->get_fg_root());
 397         texture_path.append("Textures");
 398         texture_path.append("Sky");
 399         for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
 400             SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
 401             thesky->add_cloud_layer(layer);
 402         }
 403
 404         SGPath sky_tex_path( globals->get_fg_root() );
 405         sky_tex_path.append( "Textures" );
 406         sky_tex_path.append( "Sky" );
 407         thesky->texture_path( sky_tex_path.str() );
 408
 409         // The sun and moon diameters are scaled down numbers of the
 410         // actual diameters. This was needed to fit both the sun and the
 411         // moon within the distance to the far clip plane.
 412         // Moon diameter:    3,476 kilometers
 413         // Sun diameter: 1,390,000 kilometers
 414         thesky->build( 80000.0, 80000.0,
 415                        463.3, 361.8,
 416                        *globals->get_ephem(),
 417                        fgGetNode("/environment", true));
 418
 419         // Initialize MagVar model
 420         SGMagVar *magvar = new SGMagVar();
 421         globals->set_mag( magvar );
 422
 423
 424                                     // kludge to initialize mag compass
 425                                     // (should only be done for in-flight
 426                                     // startup)
 427         // update magvar model
 428         globals->get_mag()->update( fgGetDouble("/position/longitude-deg")
 429                                     * SGD_DEGREES_TO_RADIANS,
 430                                     fgGetDouble("/position/latitude-deg")
 431                                     * SGD_DEGREES_TO_RADIANS,
 432                                     fgGetDouble("/position/altitude-ft")
 433                                     * SG_FEET_TO_METER,
 434                                     globals->get_time_params()->getJD() );
 435         double var = globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES;
 436         fgSetDouble("/instrumentation/heading-indicator/offset-deg", -var);
 437         fgSetDouble("/instrumentation/heading-indicator-fg/offset-deg", -var);
 438
 439
 440         // airport = new ssgBranch;
 441         // airport->setName( "Airport Lighting" );
 442         // lighting->addKid( airport );
 443
 444         // build our custom render states
 445         fgSplashProgress("initializing subsystems");
 446
 447
 448     } else if ( idle_state == 7 ) {
 449         idle_state++;
 450         // Initialize audio support
 451 #ifdef ENABLE_AUDIO_SUPPORT
 452
 453         // Start the intro music
 454         if ( fgGetBool("/sim/startup/intro-music") ) {
 455             SGPath mp3file( globals->get_fg_root() );
 456             mp3file.append( "Sounds/intro.mp3" );
 457
 458             SG_LOG( SG_GENERAL, SG_INFO,
 459                 "Starting intro music: " << mp3file.str() );
 460
 461 # if defined( __CYGWIN__ )
 462             string command = "start /m `cygpath -w " + mp3file.str() + "`";
 463 # elif defined( _WIN32 )
 464             string command = "start /m " + mp3file.str();
 465 # else
 466             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
 467 # endif
 468
 469             system ( command.c_str() );
 470         }
 471 #endif
 472         // This is the top level init routine which calls all the
 473         // other subsystem initialization routines.  If you are adding
 474         // a subsystem to flightgear, its initialization call should be
 475         // located in this routine.
 476         if( !fgInitSubsystems()) {
 477             SG_LOG( SG_GENERAL, SG_ALERT,
 478                 "Subsystem initialization failed ..." );
 479             exit(-1);
 480         }
 481
 482         // Torsten Dreyer:
 483         // ugly hack for automatic runway selection on startup based on
 484         // metar data. Makes startup.nas obsolete and guarantees the same
 485         // runway selection as for AI traffic. However, this code belongs to
 486         // somewhere(?) else - if I only new where...
 487         if( true == fgGetBool( "/environment/metar/valid" ) ) {
 488             // the realwx_ctrl fetches metar in the foreground on init,
 489             // If it was able to fetch a metar or one was given on the commandline,
 490             // the valid flag is set here, otherwise it is false
 491             double hdg = fgGetDouble( "/environment/metar/base-wind-dir-deg", 9999.0 );
 492             string apt = fgGetString( "/sim/startup/options/airport" );
 493             string rwy = fgGetString( "/sim/startup/options/runway" );
 494             double strthdg = fgGetDouble( "/sim/startup/options/heading-deg", 9999.0 );
 495             string parkpos = fgGetString( "/sim/presets/parkpos" );
 496             bool onground = fgGetBool( "/sim/presets/onground", false );
 497             // don't check for wind-speed < 1kt, this belongs to the runway-selection code
 498             // the other logic is taken from former startup.nas
 499             if( hdg < 360.0 && apt.length() > 0 && strthdg > 360.0 && rwy.length() == 0 && onground && parkpos.length() == 0 ) {
 500                 extern bool fgSetPosFromAirportIDandHdg( const string& id, double tgt_hdg );
 501                 fgSetPosFromAirportIDandHdg( apt, hdg );
 502             }
 503         }
 504         fgSplashProgress("setting up time & renderer");
 505
 506     } else if ( idle_state == 8 ) {
 507         idle_state = 1000;
 508
 509         // setup OpenGL view parameters
 510         globals->get_renderer()->init();
 511
 512         globals->get_renderer()->resize( fgGetInt("/sim/startup/xsize"),
 513                                          fgGetInt("/sim/startup/ysize") );
 514
 515         fgSplashProgress("loading scenery objects");
 516         int session = fgGetInt("/sim/session",0);
 517         session++;
 518         fgSetInt("/sim/session",session);
 519     }
 520
 521     if ( idle_state == 1000 ) {
 522         // We've finished all our initialization steps, from now on we
 523         // run the main loop.
 524         fgSetBool("sim/sceneryloaded", false);
 525         fgRegisterIdleHandler( fgMainLoop );
 526     }
 527 }
 528
 529
 530 static void upper_case_property(const char *name)
 531 {
 532     using namespace simgear;
 533     SGPropertyNode *p = fgGetNode(name, false);
 534     if (!p) {
 535         p = fgGetNode(name, true);
 536         p->setStringValue("");
 537     } else {
 538         props::Type t = p->getType();
 539         if (t == props::NONE || t == props::UNSPECIFIED)
 540             p->setStringValue("");
 541         else
 542             assert(t == props::STRING);
 543     }
 544     p->addChangeListener(new FGMakeUpperCase);
 545 }
 546
 547
 548 // Main top level initialization
 549 int fgMainInit( int argc, char **argv ) {
 550
 551     // set default log levels
 552     sglog().setLogLevels( SG_ALL, SG_ALERT );
 553
 554     string version;
 555 #ifdef FLIGHTGEAR_VERSION
 556     version = FLIGHTGEAR_VERSION;
 557 #else
 558     version = "unknown version";
 559 #endif
 560     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
 561             << version );
 562     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
 563
 564     // Allocate global data structures.  This needs to happen before
 565     // we parse command line options
 566
 567     globals = new FGGlobals;
 568
 569     // seed the random number generator
 570     sg_srandom_time();
 571
 572     FGControls *controls = new FGControls;
 573     globals->set_controls( controls );
 574
 575     string_list *col = new string_list;
 576     globals->set_channel_options_list( col );
 577
 578     fgValidatePath("", false);  // initialize static variables
 579     upper_case_property("/sim/presets/airport-id");
 580     upper_case_property("/sim/presets/runway");
 581     upper_case_property("/sim/tower/airport-id");
 582     upper_case_property("/autopilot/route-manager/input");
 583
 584     // Scan the config file(s) and command line options to see if
 585     // fg_root was specified (ignore all other options for now)
 586     fgInitFGRoot(argc, argv);
 587
 588     // Check for the correct base package version
 589     static char required_version[] = "2.0.0";
 590     string base_version = fgBasePackageVersion();
 591     if ( !(base_version == required_version) ) {
 592         // tell the operator how to use this application
 593
 594         SG_LOG( SG_GENERAL, SG_ALERT, "" ); // To popup the console on windows
 595         cerr << endl << "Base package check failed ... " \
 596              << "Found version " << base_version << " at: " \
 597              << globals->get_fg_root() << endl;
 598         cerr << "Please upgrade to version: " << required_version << endl;
 599 #ifdef _MSC_VER
 600         cerr << "Hit a key to continue..." << endl;
 601         cin.get();
 602 #endif
 603         exit(-1);
 604     }
 605
 606     // Load the configuration parameters.  (Command line options
 607     // override config file options.  Config file options override
 608     // defaults.)
 609     if ( !fgInitConfig(argc, argv) ) {
 610         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
 611         exit(-1);
 612     }
 613
 614     // Initialize the Window/Graphics environment.
 615     fgOSInit(&argc, argv);
 616     _bootstrap_OSInit++;
 617
 618     fgRegisterWindowResizeHandler( &FGRenderer::resize );
 619     fgRegisterIdleHandler( &fgIdleFunction );
 620     fgRegisterDrawHandler( &FGRenderer::update );
 621
 622     // Initialize sockets (WinSock needs this)
 623     simgear::Socket::initSockets();
 624
 625     // Clouds3D requires an alpha channel
 626     fgOSOpenWindow(true /* request stencil buffer */);
 627
 628     // Initialize the splash screen right away
 629     fntInit();
 630     fgSplashInit();
 631
 632     // pass control off to the master event handler
 633     int result = fgOSMainLoop();
 634
 635     // clean up here; ensure we null globals to avoid
 636     // confusing the atexit() handler
 637     delete globals;
 638     globals = NULL;
 639
 640     return result;
 641 }
 642
 643