2 // fg_init.cxx -- Flight Gear top level initialization routines
4 // Written by Curtis Olson, started August 1997.
6 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU General Public License as
10 // published by the Free Software Foundation; either version 2 of the
11 // License, or (at your option) any later version.
13 // This program is distributed in the hope that it will be useful, but
14 // WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 // (Log is kept at end of this file)
34 // work around a stdc++ lib bug in some versions of linux, but doesn't
35 // seem to hurt to have this here for all versions of Linux.
37 # define _G_NO_EXTERN_TEMPLATES
42 #include <Include/fg_constants.h>
43 #include <Include/general.h>
45 #include <Aircraft/aircraft.hxx>
46 #include <Airports/simple.hxx>
47 #include <Astro/sky.hxx>
48 #include <Astro/stars.hxx>
49 #include <Astro/solarsystem.hxx>
50 #include <Autopilot/autopilot.hxx>
51 #include <Cockpit/cockpit.hxx>
52 // #include <Debug/fg_debug.h>
53 #include <Debug/logstream.hxx>
54 #include <Joystick/joystick.hxx>
55 #include <Math/fg_geodesy.hxx>
56 #include <Math/fg_random.h>
57 #include <Math/point3d.hxx>
58 #include <Math/polar3d.hxx>
59 #include <Scenery/scenery.hxx>
60 #include <Scenery/tilemgr.hxx>
61 #include <Time/event.hxx>
62 #include <Time/fg_time.hxx>
63 #include <Time/light.hxx>
64 #include <Time/sunpos.hxx>
65 #include <Weather/weather.hxx>
67 #include "fg_init.hxx"
68 #include "options.hxx"
72 extern const char *default_root;
75 // Set initial position and orientation
76 int fgInitPosition( void ) {
80 f = current_aircraft.flight;
82 id = current_options.get_airport_id();
84 // set initial position from airport id
89 FG_LOG( FG_GENERAL, FG_INFO,
90 "Attempting to set starting position from airport code "
93 airports.load("apt_simple");
94 if ( ! airports.search( id, &a ) ) {
95 FG_LOG( FG_GENERAL, FG_ALERT,
96 "Failed to find " << id << " in database." );
99 FG_Longitude = a.longitude * DEG_TO_RAD;
100 FG_Latitude = a.latitude * DEG_TO_RAD;
103 // set initial position from default or command line coordinates
105 FG_Longitude = current_options.get_lon() * DEG_TO_RAD;
106 FG_Latitude = current_options.get_lat() * DEG_TO_RAD;
108 printf("starting altitude is = %.2f\n", current_options.get_altitude());
110 FG_Altitude = current_options.get_altitude() * METER_TO_FEET;
111 FG_Runway_altitude = FG_Altitude - 3.758099;
113 FG_LOG( FG_GENERAL, FG_INFO,
114 "Initial position is: ("
115 << (FG_Longitude * RAD_TO_DEG) << ", "
116 << (FG_Latitude * RAD_TO_DEG) << ", "
117 << (FG_Altitude * FEET_TO_METER) << ")" );
123 // General house keeping initializations
124 int fgInitGeneral( void ) {
131 // set default log levels
132 fglog().setLogLevels( FG_ALL, FG_INFO );
134 FG_LOG( FG_GENERAL, FG_INFO, "General Initialization" );
135 FG_LOG( FG_GENERAL, FG_INFO, "======= ==============" );
137 g->glVendor = (char *)glGetString ( GL_VENDOR );
138 g->glRenderer = (char *)glGetString ( GL_RENDERER );
139 g->glVersion = (char *)glGetString ( GL_VERSION );
141 root = current_options.get_fg_root();
142 if ( ! root.length() ) {
143 // No root path set? Then bail ...
144 FG_LOG( FG_GENERAL, FG_ALERT,
145 "Cannot continue without environment variable FG_ROOT"
146 << "being defined." );
149 FG_LOG( FG_GENERAL, FG_INFO, "FG_ROOT = " << root << endl );
151 // prime the frame rate counter pump
152 for ( i = 0; i < FG_FRAME_RATE_HISTORY; i++ ) {
160 // This is the top level init routine which calls all the other
161 // initialization routines. If you are adding a subsystem to flight
162 // gear, its initialization call should located in this routine.
163 // Returns non-zero if a problem encountered.
164 int fgInitSubsystems( void )
170 Point3D geod_pos, abs_view_pos;
172 l = &cur_light_params;
173 t = &cur_time_params;
176 FG_LOG( FG_GENERAL, FG_INFO, "Initialize Subsystems");
177 FG_LOG( FG_GENERAL, FG_INFO, "========== ==========");
179 // seed the random number generater
182 // allocates structures so must happen before any of the flight
183 // model or control parameters are set
184 fgAircraftInit(); // In the future this might not be the case.
185 f = current_aircraft.flight;
187 // set the initial position
190 // Initialize the Scenery Management subsystem
191 if ( fgSceneryInit() ) {
192 // Scenery initialized ok.
194 FG_LOG( FG_GENERAL, FG_ALERT, "Error in Scenery initialization!" );
198 if( fgTileMgrInit() ) {
199 // Load the local scenery data
202 FG_LOG( FG_GENERAL, FG_ALERT, "Error in Tile Manager initialization!" );
206 // calculalate a cartesian point somewhere along the line between
207 // the center of the earth and our view position. Doesn't have to
208 // be the exact elevation (this is good because we don't know it
210 geod_pos = Point3D( FG_Longitude, FG_Latitude, 0.0);
211 abs_view_pos = fgGeodToCart(geod_pos);
213 // Calculate ground elevation at starting point
215 fgTileMgrCurElev( FG_Longitude, FG_Latitude, abs_view_pos );
216 FG_Runway_altitude = scenery.cur_elev * METER_TO_FEET;
218 // Reset our altitude if we are below ground
219 if ( FG_Altitude < FG_Runway_altitude + 3.758099) {
220 FG_Altitude = FG_Runway_altitude + 3.758099;
223 FG_LOG( FG_GENERAL, FG_INFO,
224 "Updated position (after elevation adj): ("
225 << (FG_Latitude * RAD_TO_DEG) << ", "
226 << (FG_Longitude * RAD_TO_DEG) << ", "
227 << (FG_Altitude * FEET_TO_METER) << ")" );
228 // end of thing that I just stuck in that I should probably move
230 // The following section sets up the flight model EOM parameters
231 // and should really be read in from one or more files.
234 FG_V_north = 0.0; // 7.287719E+00
235 FG_V_east = 0.0; // 1.521770E+03
236 FG_V_down = 0.0; // -1.265722E-05
238 // Initial Orientation
239 FG_Phi = current_options.get_roll() * DEG_TO_RAD;
240 FG_Theta = current_options.get_pitch() * DEG_TO_RAD;
241 FG_Psi = current_options.get_heading() * DEG_TO_RAD;
243 // Initial Angular B rates
244 FG_P_body = 7.206685E-05;
245 FG_Q_body = 0.000000E+00;
246 FG_R_body = 9.492658E-05;
248 FG_Earth_position_angle = 0.000000E+00;
250 // Mass properties and geometry values
251 FG_Mass = 8.547270E+01;
252 FG_I_xx = 1.048000E+03;
253 FG_I_yy = 3.000000E+03;
254 FG_I_zz = 3.530000E+03;
255 FG_I_xz = 0.000000E+00;
257 // CG position w.r.t. ref. point
258 FG_Dx_cg = 0.000000E+00;
259 FG_Dy_cg = 0.000000E+00;
260 FG_Dz_cg = 0.000000E+00;
262 // Initialize the event manager
263 global_events.Init();
265 // Output event stats every 60 seconds
266 global_events.Register( "fgEVENT_MGR::PrintStats()",
267 fgMethodCallback<fgEVENT_MGR>( &global_events,
268 &fgEVENT_MGR::PrintStats),
269 fgEVENT::FG_EVENT_READY, 60000 );
271 // Initialize the time dependent variables
275 // Initialize view parameters
276 FG_LOG( FG_GENERAL, FG_DEBUG, "Before v->init()");
278 FG_LOG( FG_GENERAL, FG_DEBUG, "After v->init()");
279 v->UpdateViewMath(f);
280 v->UpdateWorldToEye(f);
282 // Build the solar system
283 //fgSolarSystemInit(*t);
284 FG_LOG(FG_GENERAL, FG_INFO, "Building SolarSystem");
285 SolarSystem::theSolarSystem = new SolarSystem(t);
287 // Initialize the Stars subsystem
288 if( fgStarsInit() ) {
289 // Stars initialized ok.
291 FG_LOG( FG_GENERAL, FG_ALERT, "Error in Stars initialization!" );
295 // Initialize the planetary subsystem
296 // global_events.Register( "fgPlanetsInit()", fgPlanetsInit,
297 // fgEVENT::FG_EVENT_READY, 600000);
299 // Initialize the sun's position
300 // global_events.Register( "fgSunInit()", fgSunInit,
301 // fgEVENT::FG_EVENT_READY, 30000 );
303 // Intialize the moon's position
304 // global_events.Register( "fgMoonInit()", fgMoonInit,
305 // fgEVENT::FG_EVENT_READY, 600000 );
307 // register the periodic update of Sun, moon, and planets
308 global_events.Register( "ssolsysUpdate", solarSystemRebuild,
309 fgEVENT::FG_EVENT_READY, 600000);
311 // fgUpdateSunPos() needs a few position and view parameters set
312 // so it can calculate local relative sun angle and a few other
313 // things for correctly orienting the sky.
315 global_events.Register( "fgUpdateSunPos()", fgUpdateSunPos,
316 fgEVENT::FG_EVENT_READY, 60000);
318 // Initialize Lighting interpolation tables
321 // update the lighting parameters (based on sun angle)
322 global_events.Register( "fgLight::Update()",
323 fgMethodCallback<fgLIGHT>( &cur_light_params,
325 fgEVENT::FG_EVENT_READY, 30000 );
327 // Initialize the weather modeling subsystem
330 // Initialize the Cockpit subsystem
331 if( fgCockpitInit( ¤t_aircraft )) {
332 // Cockpit initialized ok.
334 FG_LOG( FG_GENERAL, FG_ALERT, "Error in Cockpit initialization!" );
338 // Initialize the "sky"
341 // Initialize the flight model subsystem data structures base on
344 fgFlightModelInit( current_options.get_flight_model(), f,
345 1.0 / DEFAULT_MODEL_HZ );
347 // I'm just sticking this here for now, it should probably move
349 scenery.cur_elev = FG_Runway_altitude * FEET_TO_METER;
351 if ( FG_Altitude < FG_Runway_altitude + 3.758099) {
352 FG_Altitude = FG_Runway_altitude + 3.758099;
355 FG_LOG( FG_GENERAL, FG_INFO,
356 "Updated position (after elevation adj): ("
357 << (FG_Latitude * RAD_TO_DEG) << ", "
358 << (FG_Longitude * RAD_TO_DEG) << ", "
359 << (FG_Altitude * FEET_TO_METER) << ")" );
360 // end of thing that I just stuck in that I should probably move
363 if ( fgJoystickInit() ) {
364 // Joystick initialized ok.
366 FG_LOG( FG_GENERAL, FG_ALERT, "Error in Joystick initialization!" );
369 // Autopilot init added here, by Jeff Goeke-Smith
370 fgAPInit(¤t_aircraft);
372 FG_LOG( FG_GENERAL, FG_INFO, endl);
379 // Revision 1.47 1998/11/06 21:18:10 curt
380 // Converted to new logstream debugging facility. This allows release
381 // builds with no messages at all (and no performance impact) by using
382 // the -DFG_NDEBUG flag.
384 // Revision 1.46 1998/10/27 02:14:38 curt
385 // Changes to support GLUT joystick routines as fall back.
387 // Revision 1.45 1998/10/25 10:57:21 curt
388 // Changes to use the new joystick library if it is available.
390 // Revision 1.44 1998/10/18 01:17:17 curt
393 // Revision 1.43 1998/10/17 01:34:22 curt
396 // Revision 1.42 1998/10/16 23:27:54 curt
399 // Revision 1.41 1998/10/16 00:54:01 curt
400 // Converted to Point3D class.
402 // Revision 1.40 1998/10/02 12:46:49 curt
403 // Added an "auto throttle"
405 // Revision 1.39 1998/09/29 02:03:39 curt
408 // Revision 1.38 1998/09/15 04:27:30 curt
409 // Changes for new Astro code.
411 // Revision 1.37 1998/09/15 02:09:26 curt
412 // Include/fg_callback.hxx
413 // Moved code inline to stop g++ 2.7 from complaining.
415 // Simulator/Time/event.[ch]xx
416 // Changed return type of fgEVENT::printStat(). void caused g++ 2.7 to
417 // complain bitterly.
419 // Minor bugfix and changes.
421 // Simulator/Main/GLUTmain.cxx
422 // Added missing type to idle_state definition - eliminates a warning.
424 // Simulator/Main/fg_init.cxx
425 // Changes to airport lookup.
427 // Simulator/Main/options.cxx
428 // Uses fg_gzifstream when loading config file.
430 // Revision 1.36 1998/09/08 21:40:08 curt
431 // Fixes by Charlie Hotchkiss.
433 // Revision 1.35 1998/08/29 13:09:26 curt
434 // Changes to event manager from Bernie Bright.
436 // Revision 1.34 1998/08/27 17:02:06 curt
437 // Contributions from Bernie Bright <bbright@c031.aone.net.au>
438 // - use strings for fg_root and airport_id and added methods to return
440 // - inlined all access methods,
441 // - made the parsing functions private methods,
442 // - deleted some unused functions.
443 // - propogated some of these changes out a bit further.
445 // Revision 1.33 1998/08/25 20:53:32 curt
446 // Shuffled $FG_ROOT file layout.
448 // Revision 1.32 1998/08/25 16:59:09 curt
449 // Directory reshuffling.
451 // Revision 1.31 1998/08/22 14:49:57 curt
452 // Attempting to iron out seg faults and crashes.
453 // Did some shuffling to fix a initialization order problem between view
454 // position, scenery elevation.
456 // Revision 1.30 1998/08/20 20:32:33 curt
457 // Reshuffled some of the code in and around views.[ch]xx
459 // Revision 1.29 1998/07/30 23:48:27 curt
460 // Output position & orientation when pausing.
461 // Eliminated libtool use.
462 // Added options to specify initial position and orientation.
463 // Changed default fov to 55 degrees.
464 // Added command line option to start in paused or unpaused state.
466 // Revision 1.28 1998/07/27 18:41:25 curt
467 // Added a pause command "p"
468 // Fixed some initialization order problems between pui and glut.
469 // Added an --enable/disable-sound option.
471 // Revision 1.27 1998/07/24 21:39:10 curt
472 // Debugging output tweaks.
473 // Cast glGetString to (char *) to avoid compiler errors.
474 // Optimizations to fgGluLookAt() by Norman Vine.
476 // Revision 1.26 1998/07/22 21:40:44 curt
477 // Clear to adjusted fog color (for sunrise/sunset effects)
478 // Make call to fog sunrise/sunset adjustment method.
479 // Add a stdc++ library bug work around to fg_init.cxx
481 // Revision 1.25 1998/07/13 21:01:38 curt
482 // Wrote access functions for current fgOPTIONS.
484 // Revision 1.24 1998/07/13 15:32:39 curt
485 // Clear color buffer if drawing wireframe.
486 // When specifying and airport, start elevation at -1000 and let the system
487 // position you at ground level.
489 // Revision 1.23 1998/07/12 03:14:43 curt
490 // Added ground collision detection.
491 // Did some serious horsing around to be able to "hug" the ground properly
492 // and still be able to take off.
493 // Set the near clip plane to 1.0 meters when less than 10 meters above the
495 // Did some serious horsing around getting the initial airplane position to be
496 // correct based on rendered terrain elevation.
497 // Added a little cheat/hack that will prevent the view position from ever
498 // dropping below the terrain, even when the flight model doesn't quite
499 // put you as high as you'd like.
501 // Revision 1.22 1998/07/04 00:52:25 curt
502 // Add my own version of gluLookAt() (which is nearly identical to the
503 // Mesa/glu version.) But, by calculating the Model View matrix our selves
504 // we can save this matrix without having to read it back in from the video
505 // card. This hopefully allows us to save a few cpu cycles when rendering
506 // out the fragments because we can just use glLoadMatrixd() with the
507 // precalculated matrix for each tile rather than doing a push(), translate(),
508 // pop() for every fragment.
510 // Panel status defaults to off for now until it gets a bit more developed.
512 // Extract OpenGL driver info on initialization.
514 // Revision 1.21 1998/06/27 16:54:33 curt
515 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
516 // Don't change the view port when displaying the panel.
518 // Revision 1.20 1998/06/17 21:35:12 curt
519 // Refined conditional audio support compilation.
520 // Moved texture parameter setup calls to ../Scenery/materials.cxx
521 // #include <string.h> before various STL includes.
522 // Make HUD default state be enabled.
524 // Revision 1.19 1998/06/08 17:57:05 curt
525 // Minor sound/startup position tweaks.
527 // Revision 1.18 1998/06/03 00:47:14 curt
528 // Updated to compile in audio support if OSS available.
529 // Updated for new version of Steve's audio library.
530 // STL includes don't use .h
531 // Small view optimizations.
533 // Revision 1.17 1998/06/01 17:54:42 curt
534 // Added Linux audio support.
535 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
538 // Revision 1.16 1998/05/29 20:37:24 curt
539 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
540 // Read airport list into a "map" STL for dynamic list sizing and fast tree
543 // Revision 1.15 1998/05/22 21:28:53 curt
544 // Modifications to use the new fgEVENT_MGR class.
546 // Revision 1.14 1998/05/20 20:51:35 curt
547 // Tweaked smooth shaded texture lighting properties.
548 // Converted fgLIGHT to a C++ class.
550 // Revision 1.13 1998/05/16 13:08:35 curt
551 // C++ - ified views.[ch]xx
552 // Shuffled some additional view parameters into the fgVIEW class.
553 // Changed tile-radius to tile-diameter because it is a much better
555 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
556 // to transform world space to eye space for view frustum culling.
558 // Revision 1.12 1998/05/13 18:29:58 curt
559 // Added a keyboard binding to dynamically adjust field of view.
560 // Added a command line option to specify fov.
561 // Adjusted terrain color.
562 // Root path info moved to fgOPTIONS.
563 // Added ability to parse options out of a config file.
565 // Revision 1.11 1998/05/07 23:14:15 curt
566 // Added "D" key binding to set autopilot heading.
567 // Made frame rate calculation average out over last 10 frames.
568 // Borland C++ floating point exception workaround.
569 // Added a --tile-radius=n option.
571 // Revision 1.10 1998/05/06 03:16:24 curt
572 // Added an averaged global frame rate counter.
573 // Added an option to control tile radius.
575 // Revision 1.9 1998/05/03 00:47:31 curt
576 // Added an option to enable/disable full-screen mode.
578 // Revision 1.8 1998/04/30 12:34:18 curt
579 // Added command line rendering options:
580 // enable/disable fog/haze
581 // specify smooth/flat shading
582 // disable sky blending and just use a solid color
583 // enable wireframe drawing mode
585 // Revision 1.7 1998/04/28 01:20:22 curt
586 // Type-ified fgTIME and fgVIEW.
587 // Added a command line option to disable textures.
589 // Revision 1.6 1998/04/26 05:10:03 curt
590 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
592 // Revision 1.5 1998/04/25 22:06:30 curt
593 // Edited cvs log messages in source files ... bad bad bad!
595 // Revision 1.4 1998/04/25 20:24:01 curt
596 // Cleaned up initialization sequence to eliminate interdependencies
597 // between sun position, lighting, and view position. This creates a
598 // valid single pass initialization path.
600 // Revision 1.3 1998/04/25 15:11:11 curt
601 // Added an command line option to set starting position based on airport ID.
603 // Revision 1.2 1998/04/24 00:49:20 curt
604 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
605 // Trying out some different option parsing code.
606 // Some code reorganization.
608 // Revision 1.1 1998/04/22 13:25:44 curt
609 // C++ - ifing the code.
610 // Starting a bit of reorganization of lighting code.
612 // Revision 1.56 1998/04/18 04:11:28 curt
613 // Moved fg_debug to it's own library, added zlib support.
615 // Revision 1.55 1998/04/14 02:21:03 curt
616 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
617 // <jgoeke@voyager.net>
619 // Revision 1.54 1998/04/08 23:35:36 curt
620 // Tweaks to Gnu automake/autoconf system.
622 // Revision 1.53 1998/04/03 22:09:06 curt
623 // Converting to Gnu autoconf system.
625 // Revision 1.52 1998/03/23 21:24:38 curt
626 // Source code formating tweaks.
628 // Revision 1.51 1998/03/14 00:31:22 curt
629 // Beginning initial terrain texturing experiments.
631 // Revision 1.50 1998/03/09 22:46:19 curt
634 // Revision 1.49 1998/02/23 19:07:59 curt
635 // Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
636 // calculation code between sun display, and other FG sections that use this
637 // for things like lighting.
639 // Revision 1.48 1998/02/21 14:53:15 curt
640 // Added Charlie's HUD changes.
642 // Revision 1.47 1998/02/19 13:05:53 curt
643 // Incorporated some HUD tweaks from Michelle America.
644 // Tweaked the sky's sunset/rise colors.
645 // Other misc. tweaks.
647 // Revision 1.46 1998/02/18 15:07:06 curt
648 // Tweaks to build with SGI OpenGL (and therefor hopefully other accelerated
649 // drivers will work.)
651 // Revision 1.45 1998/02/16 13:39:43 curt
652 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
653 // tiles to occasionally be missing.
655 // Revision 1.44 1998/02/12 21:59:50 curt
656 // Incorporated code changes contributed by Charlie Hotchkiss
657 // <chotchkiss@namg.us.anritsu.com>
659 // Revision 1.43 1998/02/11 02:50:40 curt
662 // Revision 1.42 1998/02/09 22:56:58 curt
663 // Removed "depend" files from cvs control. Other minor make tweaks.
665 // Revision 1.41 1998/02/09 15:07:50 curt
668 // Revision 1.40 1998/02/07 15:29:44 curt
669 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
670 // <chotchkiss@namg.us.anritsu.com>
672 // Revision 1.39 1998/02/03 23:20:25 curt
673 // Lots of little tweaks to fix various consistency problems discovered by
674 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
675 // passed arguments along to the real printf(). Also incorporated HUD changes
676 // by Michele America.
678 // Revision 1.38 1998/02/02 20:53:58 curt
679 // Incorporated Durk's changes.
681 // Revision 1.37 1998/02/01 03:39:54 curt
684 // Revision 1.36 1998/01/31 00:43:13 curt
685 // Added MetroWorks patches from Carmen Volpe.
687 // Revision 1.35 1998/01/27 00:47:57 curt
688 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
689 // system and commandline/config file processing code.
691 // Revision 1.34 1998/01/22 02:59:37 curt
692 // Changed #ifdef FILE_H to #ifdef _FILE_H
694 // Revision 1.33 1998/01/21 21:11:34 curt
697 // Revision 1.32 1998/01/19 19:27:08 curt
698 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
699 // This should simplify things tremendously.
701 // Revision 1.31 1998/01/19 18:40:32 curt
702 // Tons of little changes to clean up the code and to remove fatal errors
703 // when building with the c++ compiler.
705 // Revision 1.30 1998/01/13 00:23:09 curt
706 // Initial changes to support loading and management of scenery tiles. Note,
707 // there's still a fair amount of work left to be done.
709 // Revision 1.29 1998/01/08 02:22:08 curt
710 // Beginning to integrate Tile management subsystem.
712 // Revision 1.28 1998/01/07 03:18:58 curt
713 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
715 // Revision 1.27 1998/01/05 18:44:35 curt
716 // Add an option to advance/decrease time from keyboard.
718 // Revision 1.26 1997/12/30 23:09:04 curt
719 // Tweaking initialization sequences.
721 // Revision 1.25 1997/12/30 22:22:33 curt
722 // Further integration of event manager.
724 // Revision 1.24 1997/12/30 20:47:44 curt
725 // Integrated new event manager with subsystem initializations.
727 // Revision 1.23 1997/12/30 16:36:50 curt
728 // Merged in Durk's changes ...
730 // Revision 1.22 1997/12/19 23:34:05 curt
731 // Lot's of tweaking with sky rendering and lighting.
733 // Revision 1.21 1997/12/19 16:45:00 curt
734 // Working on scene rendering order and options.
736 // Revision 1.20 1997/12/18 23:32:33 curt
737 // First stab at sky dome actually starting to look reasonable. :-)
739 // Revision 1.19 1997/12/17 23:13:36 curt
740 // Began working on rendering a sky.
742 // Revision 1.18 1997/12/15 23:54:49 curt
743 // Add xgl wrappers for debugging.
744 // Generate terrain normals on the fly.
746 // Revision 1.17 1997/12/15 20:59:09 curt
749 // Revision 1.16 1997/12/12 19:52:48 curt
750 // Working on lightling and material properties.
752 // Revision 1.15 1997/12/11 04:43:55 curt
753 // Fixed sun vector and lighting problems. I thing the moon is now lit
756 // Revision 1.14 1997/12/10 22:37:47 curt
757 // Prepended "fg" on the name of all global structures that didn't have it yet.
758 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
760 // Revision 1.13 1997/11/25 19:25:32 curt
761 // Changes to integrate Durk's moon/sun code updates + clean up.
763 // Revision 1.12 1997/11/15 18:16:35 curt
766 // Revision 1.11 1997/10/30 12:38:42 curt
767 // Working on new scenery subsystem.
769 // Revision 1.10 1997/10/25 03:24:23 curt
770 // Incorporated sun, moon, and star positioning code contributed by Durk Talsma.
772 // Revision 1.9 1997/09/23 00:29:39 curt
773 // Tweaks to get things to compile with gcc-win32.
775 // Revision 1.8 1997/09/22 14:44:20 curt
776 // Continuing to try to align stars correctly.
778 // Revision 1.7 1997/09/16 15:50:30 curt
779 // Working on star alignment and time issues.
781 // Revision 1.6 1997/09/05 14:17:30 curt
782 // More tweaking with stars.
784 // Revision 1.5 1997/09/04 02:17:36 curt
787 // Revision 1.4 1997/08/27 21:32:26 curt
788 // Restructured view calculation code. Added stars.
790 // Revision 1.3 1997/08/27 03:30:19 curt
791 // Changed naming scheme of basic shared structures.
793 // Revision 1.2 1997/08/25 20:27:23 curt
794 // Merged in initial HUD and Joystick code.
796 // Revision 1.1 1997/08/23 01:46:20 curt