1 // main.cxx -- top level sim routines
3 // Written by Curtis Olson, started May 1997.
5 // Copyright (C) 1997 - 2002 Curtis L. Olson - http://www.flightgear.org/~curt
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.
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.
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.
28 #include <simgear/compiler.h>
30 #if defined(__linux__) && defined(__i386__)
31 # include <fpu_control.h>
37 #include <plib/netSocket.h>
40 #include <osg/GraphicsContext>
41 #include <osgDB/Registry>
44 #include <simgear/scene/model/modellib.hxx>
45 #include <simgear/scene/material/matlib.hxx>
46 #include <simgear/scene/model/animation.hxx>
47 #include <simgear/scene/sky/sky.hxx>
48 #include <simgear/structure/event_mgr.hxx>
49 #include <simgear/props/AtomicChangeListener.hxx>
50 #include <simgear/props/props.hxx>
51 #include <simgear/timing/sg_time.hxx>
52 #include <simgear/math/sg_random.h>
54 #include <Time/light.hxx>
55 #include <Include/general.hxx>
56 #include <Aircraft/replay.hxx>
57 #include <Cockpit/cockpit.hxx>
58 #include <Cockpit/hud.hxx>
59 #include <Model/panelnode.hxx>
60 #include <Model/modelmgr.hxx>
61 #include <Model/acmodel.hxx>
62 #include <Scenery/scenery.hxx>
63 #include <Scenery/tilemgr.hxx>
64 #include <Sound/fg_fx.hxx>
65 #include <Sound/beacon.hxx>
66 #include <Sound/morse.hxx>
67 #include <Sound/fg_fx.hxx>
68 #include <ATCDCL/ATCmgr.hxx>
69 #include <Time/tmp.hxx>
70 #include <Environment/environment_mgr.hxx>
71 #include <Environment/ephemeris.hxx>
72 #include <GUI/new_gui.hxx>
73 #include <MultiPlayer/multiplaymgr.hxx>
75 #include "CameraGroup.hxx"
76 #include "fg_commands.hxx"
78 #include "renderer.hxx"
82 #include "fg_init.hxx"
84 #include "WindowSystemAdapter.hxx"
85 #include <Main/viewer.hxx>
87 static double real_delta_time_sec = 0.0;
88 double delta_time_sec = 0.0;
90 using namespace flightgear;
94 // This is a record containing a bit of global housekeeping information
97 // Specify our current idle function state. This is used to run all
98 // our initializations out of the idle callback so that we can get a
99 // splash screen up and running right away.
101 long global_multi_loop;
103 SGTimeStamp last_time_stamp;
104 SGTimeStamp current_time_stamp;
106 void fgInitSoundManager();
107 void fgSetNewSoundDevice(const char *);
109 // The atexit() function handler should know when the graphical subsystem
111 extern int _bootstrap_OSInit;
113 // What should we do when we have nothing else to do? Let's get ready
114 // for the next move and update the display?
115 static void fgMainLoop( void ) {
116 int model_hz = fgGetInt("/sim/model-hz");
118 static SGConstPropertyNode_ptr longitude
119 = fgGetNode("/position/longitude-deg");
120 static SGConstPropertyNode_ptr latitude
121 = fgGetNode("/position/latitude-deg");
122 static SGConstPropertyNode_ptr altitude
123 = fgGetNode("/position/altitude-ft");
124 static SGConstPropertyNode_ptr vn_fps
125 = fgGetNode("/velocities/speed-north-fps");
126 static SGConstPropertyNode_ptr ve_fps
127 = fgGetNode("/velocities/speed-east-fps");
128 static SGConstPropertyNode_ptr vd_fps
129 = fgGetNode("/velocities/speed-down-fps");
130 static SGConstPropertyNode_ptr clock_freeze
131 = fgGetNode("/sim/freeze/clock", true);
132 static SGConstPropertyNode_ptr cur_time_override
133 = fgGetNode("/sim/time/cur-time-override", true);
134 static SGConstPropertyNode_ptr max_simtime_per_frame
135 = fgGetNode("/sim/max-simtime-per-frame", true);
136 static SGPropertyNode_ptr frame_signal
137 = fgGetNode("/sim/signals/frame", true);
139 frame_signal->fireValueChanged();
140 SGCloudLayer::enable_bump_mapping = fgGetBool("/sim/rendering/bump-mapping");
142 bool scenery_loaded = fgGetBool("sim/sceneryloaded");
143 bool wait_for_scenery = !(scenery_loaded || fgGetBool("sim/sceneryloaded-override"));
145 // Update the elapsed time.
146 static bool first_time = true;
148 last_time_stamp.stamp();
152 double throttle_hz = fgGetDouble("/sim/frame-rate-throttle-hz", 0.0);
153 if ( throttle_hz > 0.0 && !wait_for_scenery ) {
154 // optionally throttle the frame rate (to get consistent frame
155 // rates or reduce cpu usage.
157 double frame_us = 1000000.0 / throttle_hz;
159 #define FG_SLEEP_BASED_TIMING 1
160 #if defined(FG_SLEEP_BASED_TIMING)
161 // sleep based timing loop.
163 // Calling sleep, even usleep() on linux is less accurate than
164 // we like, but it does free up the cpu for other tasks during
165 // the sleep so it is desirable. Because of the way sleep()
166 // is implemented in consumer operating systems like windows
167 // and linux, you almost always sleep a little longer than the
170 // To combat the problem of sleeping too long, we calculate the
171 // desired wait time and shorten it by 2000us (2ms) to avoid
172 // [hopefully] over-sleep'ing. The 2ms value was arrived at
173 // via experimentation. We follow this up at the end with a
174 // simple busy-wait loop to get the final pause timing exactly
177 // Assuming we don't oversleep by more than 2000us, this
178 // should be a reasonable compromise between sleep based
179 // waiting, and busy waiting.
181 // sleep() will always overshoot by a bit so undersleep by
182 // 2000us in the hopes of never oversleeping.
184 if ( frame_us < 0.0 ) {
187 current_time_stamp.stamp();
189 double elapsed_us = (current_time_stamp - last_time_stamp).toUSecs();
190 if ( elapsed_us < frame_us ) {
191 double requested_us = frame_us - elapsed_us;
192 ulMilliSecondSleep ( (int)(requested_us / 1000.0) ) ;
196 // busy wait timing loop.
198 // This yields the most accurate timing. If the previous
199 // ulMilliSecondSleep() call is omitted this will peg the cpu
200 // (which is just fine if FG is the only app you care about.)
201 current_time_stamp.stamp();
202 SGTimeStamp next_time_stamp = last_time_stamp;
203 next_time_stamp += SGTimeStamp::fromSec(1e-6*frame_us);
204 while ( current_time_stamp < next_time_stamp ) {
205 current_time_stamp.stamp();
208 // run as fast as the app will go
209 current_time_stamp.stamp();
212 real_delta_time_sec = (current_time_stamp - last_time_stamp).toSecs();
214 // Limit the time we need to spend in simulation loops
215 // That means, if the /sim/max-simtime-per-frame value is strictly positive
216 // you can limit the maximum amount of time you will do simulations for
217 // one frame to display. The cpu time spent in simulations code is roughly
218 // at least O(real_delta_time_sec). If this is (due to running debug
219 // builds or valgrind or something different blowing up execution times)
220 // larger than the real time you will no longer get any response
221 // from flightgear. This limits that effect. Just set to property from
222 // your .fgfsrc or commandline ...
223 double dtMax = max_simtime_per_frame->getDoubleValue();
224 if (0 < dtMax && dtMax < real_delta_time_sec)
225 real_delta_time_sec = dtMax;
227 SGSubsystemGroup* fdmGroup =
228 globals->get_subsystem_mgr()->get_group(SGSubsystemMgr::FDM);
229 fdmGroup->set_fixed_update_time(1.0 / model_hz);
231 // round the real time down to a multiple of 1/model-hz.
232 // this way all systems are updated the _same_ amount of dt.
233 static double reminder = 0.0;
234 real_delta_time_sec += reminder;
235 global_multi_loop = long(floor(real_delta_time_sec*model_hz));
236 global_multi_loop = SGMisc<long>::max(0, global_multi_loop);
237 reminder = real_delta_time_sec - double(global_multi_loop)/double(model_hz);
238 real_delta_time_sec = double(global_multi_loop)/double(model_hz);
240 if (clock_freeze->getBoolValue() || wait_for_scenery) {
243 delta_time_sec = real_delta_time_sec;
245 last_time_stamp = current_time_stamp;
246 globals->inc_sim_time_sec( delta_time_sec );
248 // These are useful, especially for Nasal scripts.
249 fgSetDouble("/sim/time/delta-realtime-sec", real_delta_time_sec);
250 fgSetDouble("/sim/time/delta-sec", delta_time_sec);
252 #ifdef FANCY_FRAME_COUNTER
256 static time_t last_time = 0;
257 static int frames = 0;
258 #endif // FANCY_FRAME_COUNTER
260 SGTime *t = globals->get_time_params();
262 SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
263 SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
266 static bool last_clock_freeze = false;
268 if ( clock_freeze->getBoolValue() ) {
269 // clock freeze requested
270 if ( cur_time_override->getLongValue() == 0 ) {
271 fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
272 globals->set_warp( 0 );
275 // no clock freeze requested
276 if ( last_clock_freeze == true ) {
277 // clock just unfroze, let's set warp as the difference
278 // between frozen time and current time so we don't get a
279 // time jump (and corresponding sky object and lighting
281 globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
282 fgSetLong( "/sim/time/cur-time-override", 0 );
284 if ( globals->get_warp_delta() != 0 ) {
285 globals->inc_warp( globals->get_warp_delta() );
289 last_clock_freeze = clock_freeze->getBoolValue();
291 t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
292 latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
293 cur_time_override->getLongValue(),
294 globals->get_warp() );
296 if (globals->get_warp_delta() != 0) {
297 FGLight *l = (FGLight *)(globals->get_subsystem("lighting"));
301 // update magvar model
302 globals->get_mag()->update( longitude->getDoubleValue()
303 * SGD_DEGREES_TO_RADIANS,
304 latitude->getDoubleValue()
305 * SGD_DEGREES_TO_RADIANS,
306 altitude->getDoubleValue() * SG_FEET_TO_METER,
307 globals->get_time_params()->getJD() );
309 // Calculate frame rate average
310 #ifdef FANCY_FRAME_COUNTER
311 /* old fps calculation */
315 for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
316 tmp = general.get_frame(i);
318 // printf("frame[%d] = %.2f\n", i, g->frames[i]);
319 general.set_frame(i+1,tmp);
321 tmp = 1000000.0 / (float)elapsed;
322 general.set_frame(0,tmp);
323 // printf("frame[0] = %.2f\n", general.frames[0]);
325 general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
326 // printf("ave = %.2f\n", general.frame_rate);
329 if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
330 general.set_frame_rate( frames );
331 fgSetInt("/sim/frame-rate", frames);
332 SG_LOG( SG_ALL, SG_DEBUG,
333 "--> Frame rate is = " << general.get_frame_rate() );
336 last_time = t->get_cur_time();
340 // Update any multiplayer's network queues, the AIMultiplayer
341 // implementation is an AI model and depends on that
342 globals->get_multiplayer_mgr()->Update();
346 if (fgGetBool("/sim/atc/enabled"))
347 globals->get_ATC_mgr()->update(delta_time_sec);
350 globals->get_subsystem_mgr()->update(delta_time_sec);
351 globals->get_aircraft_model()->update(delta_time_sec);
354 // Tile Manager updates - see if we need to load any new scenery tiles.
355 // this code ties together the fdm, viewer and scenery classes...
356 // we may want to move this to its own class at some point
358 double visibility_meters = fgGetDouble("/environment/visibility-m");
359 globals->get_tile_mgr()->prep_ssg_nodes( visibility_meters );
361 // update tile manager for view...
362 SGVec3d viewPos = globals->get_current_view()->get_view_pos();
363 SGGeod geodViewPos = SGGeod::fromCart(viewPos);
364 globals->get_tile_mgr()->update(geodViewPos, visibility_meters);
366 // run Nasal's settimer() loops right before the view manager
367 globals->get_event_mgr()->update(delta_time_sec);
369 // pick up model coordidnates that Nasal code may have set relative to the
371 globals->get_model_mgr()->update(delta_time_sec);
373 // update the view angle as late as possible, but before sound calculations
374 globals->get_viewmgr()->update(real_delta_time_sec);
376 // Update the sound manager last so it can use the CPU while the GPU
377 // is processing the scenery (doubled the frame-rate for me) -EMH-
378 #ifdef ENABLE_AUDIO_SUPPORT
379 static bool smgr_init = true;
380 static SGPropertyNode *sound_working = fgGetNode("/sim/sound/working");
381 if (smgr_init == true) {
382 if (sound_working->getBoolValue() == true) {
383 fgInitSoundManager();
387 static SGPropertyNode *sound_enabled = fgGetNode("/sim/sound/enabled");
388 static SGSoundMgr *smgr = globals->get_soundmgr();
389 static bool smgr_enabled = true;
391 if (sound_working->getBoolValue() == false) { // request to reinit
394 sound_working->setBoolValue(true);
397 if (smgr_enabled != sound_enabled->getBoolValue()) {
398 if (smgr_enabled == true) { // request to suspend
400 smgr_enabled = false;
407 if (smgr_enabled == true) {
408 static SGPropertyNode *volume = fgGetNode("/sim/sound/volume");
409 smgr->set_volume(volume->getFloatValue());
410 smgr->update(delta_time_sec);
415 // END Tile Manager udpates
417 if (!scenery_loaded && globals->get_tile_mgr()->isSceneryLoaded()
418 && fgGetBool("sim/fdm-initialized")) {
419 fgSetBool("sim/sceneryloaded",true);
420 if (fgGetBool("/sim/sound/working")) {
421 globals->get_soundmgr()->activate();
423 globals->get_props()->tie("/sim/sound/devices/name",
424 SGRawValueFunctions<const char *>(0, fgSetNewSoundDevice), false);
426 simgear::AtomicChangeListener::fireChangeListeners();
429 SG_LOG( SG_ALL, SG_DEBUG, "" );
432 void fgInitSoundManager()
434 SGSoundMgr *smgr = globals->get_soundmgr();
437 smgr->init(fgGetString("/sim/sound/device-name", NULL));
439 vector <const char*>devices = smgr->get_available_devices();
440 for (unsigned int i=0; i<devices.size(); i++) {
441 SGPropertyNode *p = fgGetNode("/sim/sound/devices/device", i, true);
442 p->setStringValue(devices[i]);
447 void fgSetNewSoundDevice(const char *device)
449 globals->get_soundmgr()->suspend();
450 globals->get_soundmgr()->stop();
451 globals->get_soundmgr()->init(device);
452 globals->get_soundmgr()->resume();
455 // Operation for querying OpenGL parameters. This must be done in a
456 // valid OpenGL context, potentially in another thread.
459 struct GeneralInitOperation : public GraphicsContextOperation
461 GeneralInitOperation()
462 : GraphicsContextOperation(std::string("General init"))
465 void run(osg::GraphicsContext* gc)
467 general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
468 general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
469 general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
470 SG_LOG( SG_GENERAL, SG_INFO, general.get_glVendor() );
471 SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
472 SG_LOG( SG_GENERAL, SG_INFO, general.get_glVersion() );
475 glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
476 general.set_glMaxTexSize( tmp );
477 SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
479 glGetIntegerv( GL_DEPTH_BITS, &tmp );
480 general.set_glDepthBits( tmp );
481 SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
486 osg::Node* load_panel(SGPropertyNode *n)
488 osg::Geode* geode = new osg::Geode;
489 geode->addDrawable(new FGPanelNode(n));
493 SGPath resolve_path(const std::string& s)
495 return globals->resolve_maybe_aircraft_path(s);
500 // This is the top level master main function that is registered as
503 // The first few passes take care of initialization things (a couple
504 // per pass) and once everything has been initialized fgMainLoop from
507 static void fgIdleFunction ( void ) {
508 static osg::ref_ptr<GeneralInitOperation> genOp;
509 if ( idle_state == 0 ) {
511 // Pick some window on which to do queries.
512 // XXX Perhaps all this graphics initialization code should be
513 // moved to renderer.cxx?
514 genOp = new GeneralInitOperation;
515 osg::Camera* guiCamera = getGUICamera(CameraGroup::getDefault());
516 WindowSystemAdapter* wsa = WindowSystemAdapter::getWSA();
517 osg::GraphicsContext* gc = 0;
519 gc = guiCamera->getGraphicsContext();
521 gc->add(genOp.get());
523 wsa->windows[0]->gc->add(genOp.get());
526 } else if ( idle_state == 1 ) {
528 if (!genOp->isFinished())
532 if (!guiFinishInit())
535 fgSplashProgress("reading aircraft list");
538 } else if ( idle_state == 2 ) {
541 fgSplashProgress("reading airport & navigation data");
544 } else if ( idle_state == 3 ) {
547 fgSplashProgress("setting up scenery");
550 } else if ( idle_state == 4 ) {
552 // based on the requested presets, calculate the true starting
555 fgInitTowerLocationListener();
557 SGTime *t = fgInitTime();
558 globals->set_time_params( t );
560 // Do some quick general initializations
561 if( !fgInitGeneral()) {
562 SG_LOG( SG_GENERAL, SG_ALERT,
563 "General initialization failed ..." );
567 ////////////////////////////////////////////////////////////////////
568 // Initialize the property-based built-in commands
569 ////////////////////////////////////////////////////////////////////
573 ////////////////////////////////////////////////////////////////////
574 // Initialize the material manager
575 ////////////////////////////////////////////////////////////////////
576 globals->set_matlib( new SGMaterialLib );
577 simgear::SGModelLib::init(globals->get_fg_root());
578 simgear::SGModelLib::setPropRoot(globals->get_props());
579 simgear::SGModelLib::setResolveFunc(resolve_path);
580 simgear::SGModelLib::setPanelFunc(load_panel);
582 ////////////////////////////////////////////////////////////////////
583 // Initialize the TG scenery subsystem.
584 ////////////////////////////////////////////////////////////////////
585 globals->set_scenery( new FGScenery );
586 globals->get_scenery()->init();
587 globals->get_scenery()->bind();
588 globals->set_tile_mgr( new FGTileMgr );
591 ////////////////////////////////////////////////////////////////////
592 // Initialize the general model subsystem.
593 ////////////////////////////////////////////////////////////////////
594 globals->set_model_mgr(new FGModelMgr);
595 globals->get_model_mgr()->init();
596 globals->get_model_mgr()->bind();
597 fgSplashProgress("loading aircraft");
600 } else if ( idle_state == 5 ) {
603 ////////////////////////////////////////////////////////////////////
604 // Initialize the 3D aircraft model subsystem (has a dependency on
605 // the scenery subsystem.)
606 ////////////////////////////////////////////////////////////////////
607 FGAircraftModel* acm = new FGAircraftModel;
608 globals->set_aircraft_model(acm);
609 //globals->add_subsystem("aircraft-model", acm);
613 ////////////////////////////////////////////////////////////////////
614 // Initialize the view manager subsystem.
615 ////////////////////////////////////////////////////////////////////
616 FGViewMgr *viewmgr = new FGViewMgr;
617 globals->set_viewmgr( viewmgr );
620 fgSplashProgress("generating sky elements");
623 } else if ( idle_state == 6 ) {
625 // Initialize the sky
627 Ephemeris* eph = new Ephemeris;
628 globals->add_subsystem("ephmeris", eph);
629 eph->init(); // FIXME - remove this once SGSky code below is also a subsystem
632 // TODO: move to environment mgr
634 SGPath texture_path(globals->get_fg_root());
635 texture_path.append("Textures");
636 texture_path.append("Sky");
637 for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
638 SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
639 thesky->add_cloud_layer(layer);
642 SGPath sky_tex_path( globals->get_fg_root() );
643 sky_tex_path.append( "Textures" );
644 sky_tex_path.append( "Sky" );
645 thesky->texture_path( sky_tex_path.str() );
647 // The sun and moon diameters are scaled down numbers of the
648 // actual diameters. This was needed to fit both the sun and the
649 // moon within the distance to the far clip plane.
650 // Moon diameter: 3,476 kilometers
651 // Sun diameter: 1,390,000 kilometers
652 thesky->build( 80000.0, 80000.0,
654 *globals->get_ephem(),
655 fgGetNode("/environment", true));
657 // Initialize MagVar model
658 SGMagVar *magvar = new SGMagVar();
659 globals->set_mag( magvar );
662 // kludge to initialize mag compass
663 // (should only be done for in-flight
665 // update magvar model
666 globals->get_mag()->update( fgGetDouble("/position/longitude-deg")
667 * SGD_DEGREES_TO_RADIANS,
668 fgGetDouble("/position/latitude-deg")
669 * SGD_DEGREES_TO_RADIANS,
670 fgGetDouble("/position/altitude-ft")
672 globals->get_time_params()->getJD() );
673 double var = globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES;
674 fgSetDouble("/instrumentation/heading-indicator/offset-deg", -var);
675 fgSetDouble("/instrumentation/heading-indicator-fg/offset-deg", -var);
678 // airport = new ssgBranch;
679 // airport->setName( "Airport Lighting" );
680 // lighting->addKid( airport );
682 // build our custom render states
683 fgSplashProgress("initializing subsystems");
686 } else if ( idle_state == 7 ) {
688 // Initialize audio support
689 #ifdef ENABLE_AUDIO_SUPPORT
691 // Start the intro music
692 if ( fgGetBool("/sim/startup/intro-music") ) {
693 SGPath mp3file( globals->get_fg_root() );
694 mp3file.append( "Sounds/intro.mp3" );
696 SG_LOG( SG_GENERAL, SG_INFO,
697 "Starting intro music: " << mp3file.str() );
699 # if defined( __CYGWIN__ )
700 string command = "start /m `cygpath -w " + mp3file.str() + "`";
701 # elif defined( _WIN32 )
702 string command = "start /m " + mp3file.str();
704 string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
707 system ( command.c_str() );
710 // This is the top level init routine which calls all the
711 // other subsystem initialization routines. If you are adding
712 // a subsystem to flightgear, its initialization call should be
713 // located in this routine.
714 if( !fgInitSubsystems()) {
715 SG_LOG( SG_GENERAL, SG_ALERT,
716 "Subsystem initialization failed ..." );
719 fgSplashProgress("setting up time & renderer");
722 } else if ( idle_state == 8 ) {
724 // Initialize the time offset (warp) after fgInitSubsystem
725 // (which initializes the lighting interpolation tables.)
728 // setup OpenGL view parameters
729 globals->get_renderer()->init();
731 globals->get_renderer()->resize( fgGetInt("/sim/startup/xsize"),
732 fgGetInt("/sim/startup/ysize") );
734 fgSplashProgress("loading scenery objects");
735 int session = fgGetInt("/sim/session",0);
737 fgSetInt("/sim/session",session);
740 if ( idle_state == 1000 ) {
741 // We've finished all our initialization steps, from now on we
742 // run the main loop.
743 fgSetBool("sim/sceneryloaded", false);
744 fgRegisterIdleHandler( fgMainLoop );
749 static void upper_case_property(const char *name)
751 using namespace simgear;
752 SGPropertyNode *p = fgGetNode(name, false);
754 p = fgGetNode(name, true);
755 p->setStringValue("");
757 props::Type t = p->getType();
758 if (t == props::NONE || t == props::UNSPECIFIED)
759 p->setStringValue("");
761 assert(t == props::STRING);
763 p->addChangeListener(new FGMakeUpperCase);
767 // Main top level initialization
768 bool fgMainInit( int argc, char **argv ) {
770 // set default log levels
771 sglog().setLogLevels( SG_ALL, SG_ALERT );
774 #ifdef FLIGHTGEAR_VERSION
775 version = FLIGHTGEAR_VERSION;
777 version = "unknown version";
779 SG_LOG( SG_GENERAL, SG_INFO, "FlightGear: Version "
781 SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
783 // Allocate global data structures. This needs to happen before
784 // we parse command line options
786 globals = new FGGlobals;
788 // seed the random number generator
791 FGControls *controls = new FGControls;
792 globals->set_controls( controls );
794 string_list *col = new string_list;
795 globals->set_channel_options_list( col );
797 fgValidatePath("", false); // initialize static variables
798 upper_case_property("/sim/presets/airport-id");
799 upper_case_property("/sim/presets/runway");
800 upper_case_property("/sim/tower/airport-id");
801 upper_case_property("/autopilot/route-manager/input");
803 // Scan the config file(s) and command line options to see if
804 // fg_root was specified (ignore all other options for now)
805 fgInitFGRoot(argc, argv);
807 // Check for the correct base package version
808 static char required_version[] = "2.0.0";
809 string base_version = fgBasePackageVersion();
810 if ( !(base_version == required_version) ) {
811 // tell the operator how to use this application
813 SG_LOG( SG_GENERAL, SG_ALERT, "" ); // To popup the console on windows
814 cerr << endl << "Base package check failed ... " \
815 << "Found version " << base_version << " at: " \
816 << globals->get_fg_root() << endl;
817 cerr << "Please upgrade to version: " << required_version << endl;
819 cerr << "Hit a key to continue..." << endl;
825 // Load the configuration parameters. (Command line options
826 // override config file options. Config file options override
828 if ( !fgInitConfig(argc, argv) ) {
829 SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
833 // Initialize the Window/Graphics environment.
834 fgOSInit(&argc, argv);
837 fgRegisterWindowResizeHandler( &FGRenderer::resize );
838 fgRegisterIdleHandler( &fgIdleFunction );
839 fgRegisterDrawHandler( &FGRenderer::update );
841 // Initialize plib net interface
842 netInit( &argc, argv );
844 // Clouds3D requires an alpha channel
845 fgOSOpenWindow(true /* request stencil buffer */);
847 // Initialize the splash screen right away
851 // pass control off to the master event handler
854 // we never actually get here ... but to avoid compiler warnings,