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)
35 #include <Include/fg_constants.h>
36 #include <Include/general.h>
38 #include <Aircraft/aircraft.h>
39 #include <Astro/moon.hxx>
40 #include <Astro/planets.hxx>
41 #include <Astro/sky.hxx>
42 #include <Astro/stars.hxx>
43 #include <Astro/sun.hxx>
44 #include <Autopilot/autopilot.h>
45 #include <Cockpit/cockpit.hxx>
46 #include <Debug/fg_debug.h>
47 #include <Joystick/joystick.h>
48 #include <Math/fg_random.h>
49 #include <Scenery/scenery.hxx>
50 #include <Scenery/tilemgr.hxx>
51 #include <Time/event.hxx>
52 #include <Time/fg_time.hxx>
53 #include <Time/light.hxx>
54 #include <Time/sunpos.hxx>
55 #include <Weather/weather.h>
57 #include "airports.hxx"
58 #include "fg_init.hxx"
59 #include "options.hxx"
63 extern const char *default_root;
66 // Set initial position
67 int fgInitPosition( void ) {
71 f = current_aircraft.flight;
73 // If nothing else is specified, default initial position is
75 FG_Longitude = ( -110.6642444 ) * DEG_TO_RAD;
76 FG_Latitude = ( 33.3528917 ) * DEG_TO_RAD;
77 FG_Runway_altitude = (3234.5);
78 FG_Altitude = -1000 /* FG_Runway_altitude + 3.758099 */;
80 // Initial Position north of the city of Globe
81 // FG_Longitude = ( -398673.28 / 3600.0 ) * DEG_TO_RAD;
82 // FG_Latitude = ( 120625.64 / 3600.0 ) * DEG_TO_RAD;
83 // FG_Longitude = ( -397867.44 / 3600.0 ) * DEG_TO_RAD;
84 // FG_Latitude = ( 119548.21 / 3600.0 ) * DEG_TO_RAD;
85 // FG_Altitude = 0.0 + 3.758099;
87 // Initial Position near where I used to live in Globe, AZ
88 // FG_Longitude = ( -398757.6 / 3600.0 ) * DEG_TO_RAD;
89 // FG_Latitude = ( 120160.0 / 3600.0 ) * DEG_TO_RAD;
90 // FG_Runway_altitude = 4000.0;
91 // FG_Altitude = FG_Runway_altitude + 3.758099;
93 // Initial Position: 10125 Jewell St. NE
94 // FG_Longitude = ( -93.15 ) * DEG_TO_RAD;
95 // FG_Latitude = ( 45.15 ) * DEG_TO_RAD;
96 // FG_Runway_altitude = 950.0;
97 // FG_Altitude = FG_Runway_altitude + 3.758099;
99 // Initial Position near KHSP (Hot Springs, VA)
100 // FG_Longitude = (-79.8338964 + 0.01) * DEG_TO_RAD;
101 // FG_Latitude = ( 37.9514564 + 0.008) * DEG_TO_RAD;
102 // FG_Runway_altitude = (3792 + 2800);
103 // FG_Altitude = FG_Runway_altitude + 3.758099;
105 // Initial Position at (SEZ) SEDONA airport
106 // FG_Longitude = (-111.7884614 + 0.01) * DEG_TO_RAD;
107 // FG_Latitude = ( 34.8486289 - 0.015) * DEG_TO_RAD;
108 // FG_Runway_altitude = (4827 + 450);
109 // FG_Altitude = FG_Runway_altitude + 3.758099;
111 // Initial Position: Somewhere near the Grand Canyon
112 // FG_Longitude = ( -112.5 ) * DEG_TO_RAD;
113 // FG_Latitude = ( 36.5 ) * DEG_TO_RAD;
114 // FG_Runway_altitude = 8000.0;
115 // FG_Altitude = FG_Runway_altitude + 3.758099;
117 // Initial Position: Jim Brennon's Kingmont Observatory
118 // FG_Longitude = ( -121.1131667 ) * DEG_TO_RAD;
119 // FG_Latitude = ( 38.8293917 ) * DEG_TO_RAD;
120 // FG_Runway_altitude = 920.0;
121 // FG_Altitude = FG_Runway_altitude + 3.758099;
123 // probably interesting for european team members
124 // That is: If I can get the scenery to work -;) (Durk)
126 // Eclipse Watching w73.5 n10 (approx) 18:00 UT
127 // FG_Longitude = ( -73.5 ) * DEG_TO_RAD;
128 // FG_Latitude = ( 10.0 ) * DEG_TO_RAD;
129 // FG_Runway_altitude = 0.0;
130 // FG_Altitude = FG_Runway_altitude + 3.758099;
133 // FG_Longitude = ( 8.5 ) * DEG_TO_RAD;
134 // FG_Latitude = ( 47.5 ) * DEG_TO_RAD;
135 // FG_Runway_altitude = ( 6000 );
136 // FG_Altitude = FG_Runway_altitude + 3.758099;
138 current_options.get_airport_id(id);
143 fgPrintf( FG_GENERAL, FG_INFO,
144 "Attempting to set starting position from airport code %s.\n",
147 airports.load("Airports");
148 a = airports.search(id);
149 if ( (fabs(a.longitude) < FG_EPSILON) &&
150 (fabs(a.latitude) < FG_EPSILON) &&
151 (fabs(a.elevation) < FG_EPSILON) ) {
152 fgPrintf( FG_GENERAL, FG_EXIT,
153 "Failed to find %s in database.\n", id);
155 FG_Longitude = ( a.longitude ) * DEG_TO_RAD;
156 FG_Latitude = ( a.latitude ) * DEG_TO_RAD;
157 FG_Runway_altitude = ( -1000 /* a.elevation */ );
158 FG_Altitude = FG_Runway_altitude + 3.758099;
162 fgPrintf( FG_GENERAL, FG_INFO,
163 "Initial position is: (%.4f, %.4f, %.2f)\n",
164 FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
165 FG_Altitude * FEET_TO_METER);
171 // General house keeping initializations
172 int fgInitGeneral( void ) {
179 fgPrintf( FG_GENERAL, FG_INFO, "General Initialization\n" );
180 fgPrintf( FG_GENERAL, FG_INFO, "======= ==============\n" );
182 g->glVendor = glGetString ( GL_VENDOR );
183 g->glRenderer = glGetString ( GL_RENDERER );
184 g->glVersion = glGetString ( GL_VERSION );
186 current_options.get_fg_root(root);
187 if ( !strlen(root) ) {
188 // No root path set? Then bail ...
189 fgPrintf( FG_GENERAL, FG_EXIT, "%s %s\n",
190 "Cannot continue without environment variable FG_ROOT",
193 fgPrintf( FG_GENERAL, FG_INFO, "FG_ROOT = %s\n\n", root);
195 // prime the frame rate counter pump
196 for ( i = 0; i < FG_FRAME_RATE_HISTORY; i++ ) {
204 // This is the top level init routine which calls all the other
205 // initialization routines. If you are adding a subsystem to flight
206 // gear, its initialization call should located in this routine.
207 // Returns non-zero if a problem encountered.
208 int fgInitSubsystems( void ) {
214 l = &cur_light_params;
215 t = &cur_time_params;
218 fgPrintf( FG_GENERAL, FG_INFO, "Initialize Subsystems\n");
219 fgPrintf( FG_GENERAL, FG_INFO, "========== ==========\n");
221 // seed the random number generater
224 // The following section sets up the flight model EOM parameters
225 // and should really be read in from one or more files.
227 // Must happen before any of the flight model or control
228 // parameters are set
230 fgAircraftInit(); // In the future this might not be the case.
231 f = current_aircraft.flight;
233 // set the initial position
237 FG_V_north = 0.0; // 7.287719E+00
238 FG_V_east = 0.0; // 1.521770E+03
239 FG_V_down = 0.0; // -1.265722E-05
241 // Initial Orientation
242 FG_Phi = -2.658474E-06;
243 FG_Theta = 7.401790E-03;
244 FG_Psi = 270.0 * DEG_TO_RAD;
246 // Initial Angular B rates
247 FG_P_body = 7.206685E-05;
248 FG_Q_body = 0.000000E+00;
249 FG_R_body = 9.492658E-05;
251 FG_Earth_position_angle = 0.000000E+00;
253 // Mass properties and geometry values
254 FG_Mass = 8.547270E+01;
255 FG_I_xx = 1.048000E+03;
256 FG_I_yy = 3.000000E+03;
257 FG_I_zz = 3.530000E+03;
258 FG_I_xz = 0.000000E+00;
260 // CG position w.r.t. ref. point
261 FG_Dx_cg = 0.000000E+00;
262 FG_Dy_cg = 0.000000E+00;
263 FG_Dz_cg = 0.000000E+00;
265 // Initialize the event manager
266 global_events.Init();
268 // Output event stats every 60 seconds
269 global_events.Register( "fgEventPrintStats()", fgEventPrintStats,
270 FG_EVENT_READY, 60000 );
272 // Initialize the time dependent variables
276 // Initialize view parameters
279 v->UpdateWorldToEye(f);
281 // Initialize the orbital elements of sun, moon and mayor planets
282 fgSolarSystemInit(*t);
284 // Initialize the Stars subsystem
285 if( fgStarsInit() ) {
286 // Stars initialized ok.
288 fgPrintf( FG_GENERAL, FG_EXIT, "Error in Stars initialization!\n" );
291 // Initialize the planetary subsystem
292 global_events.Register( "fgPlanetsInit()", fgPlanetsInit,
293 FG_EVENT_READY, 600000);
295 // Initialize the sun's position
296 global_events.Register( "fgSunInit()", fgSunInit,
297 FG_EVENT_READY, 30000 );
299 // Intialize the moon's position
300 global_events.Register( "fgMoonInit()", fgMoonInit,
301 FG_EVENT_READY, 600000 );
303 // fgUpdateSunPos() needs a few position and view parameters set
304 // so it can calculate local relative sun angle and a few other
305 // things for correctly orienting the sky.
308 // Initialize Lighting interpolation tables
311 // update the lighting parameters (based on sun angle)
312 global_events.Register( "fgLightUpdate()", fgLightUpdate,
313 FG_EVENT_READY, 30000 );
315 // Initialize the weather modeling subsystem
318 // update the weather for our current position
319 global_events.Register( "fgWeatherUpdate()", fgWeatherUpdate,
320 FG_EVENT_READY, 120000 );
322 // Initialize the Cockpit subsystem
323 if( fgCockpitInit( ¤t_aircraft )) {
324 // Cockpit initialized ok.
326 fgPrintf( FG_GENERAL, FG_EXIT, "Error in Cockpit initialization!\n" );
329 // Initialize the "sky"
332 // Initialize the Scenery Management subsystem
333 if ( fgSceneryInit() ) {
334 // Scenery initialized ok.
336 fgPrintf( FG_GENERAL, FG_EXIT, "Error in Scenery initialization!\n" );
339 if( fgTileMgrInit() ) {
340 // Load the local scenery data
343 fgPrintf( FG_GENERAL, FG_EXIT,
344 "Error in Tile Manager initialization!\n" );
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 fgPrintf( FG_GENERAL, FG_INFO,
356 "Updated position (after elevation adj): (%.4f, %.4f, %.2f)\n",
357 FG_Latitude * RAD_TO_DEG, FG_Longitude * RAD_TO_DEG,
358 FG_Altitude * FEET_TO_METER);
359 // end of thing that I just stuck in that I should probably move
361 // Initialize the flight model subsystem data structures base on
364 fgFlightModelInit( FG_LARCSIM, f, 1.0 / DEFAULT_MODEL_HZ );
366 // I'm just sticking this here for now, it should probably move
368 scenery.cur_elev = FG_Runway_altitude * FEET_TO_METER;
370 if ( FG_Altitude < FG_Runway_altitude + 3.758099) {
371 FG_Altitude = FG_Runway_altitude + 3.758099;
374 fgPrintf( FG_GENERAL, FG_INFO,
375 "Updated position (after elevation adj): (%.4f, %.4f, %.2f)\n",
376 FG_Latitude * RAD_TO_DEG, FG_Longitude * RAD_TO_DEG,
377 FG_Altitude * FEET_TO_METER);
378 // end of thing that I just stuck in that I should probably move
381 if (fgJoystickInit(0) ) {
382 // Joystick initialized ok.
384 fgPrintf( FG_GENERAL, FG_EXIT, "Error in Joystick initialization!\n" );
387 // Autopilot init added here, by Jeff Goeke-Smith
388 fgAPInit(¤t_aircraft);
390 fgPrintf(FG_GENERAL, FG_INFO,"\n");
397 // Revision 1.25 1998/07/13 21:01:38 curt
398 // Wrote access functions for current fgOPTIONS.
400 // Revision 1.24 1998/07/13 15:32:39 curt
401 // Clear color buffer if drawing wireframe.
402 // When specifying and airport, start elevation at -1000 and let the system
403 // position you at ground level.
405 // Revision 1.23 1998/07/12 03:14:43 curt
406 // Added ground collision detection.
407 // Did some serious horsing around to be able to "hug" the ground properly
408 // and still be able to take off.
409 // Set the near clip plane to 1.0 meters when less than 10 meters above the
411 // Did some serious horsing around getting the initial airplane position to be
412 // correct based on rendered terrain elevation.
413 // Added a little cheat/hack that will prevent the view position from ever
414 // dropping below the terrain, even when the flight model doesn't quite
415 // put you as high as you'd like.
417 // Revision 1.22 1998/07/04 00:52:25 curt
418 // Add my own version of gluLookAt() (which is nearly identical to the
419 // Mesa/glu version.) But, by calculating the Model View matrix our selves
420 // we can save this matrix without having to read it back in from the video
421 // card. This hopefully allows us to save a few cpu cycles when rendering
422 // out the fragments because we can just use glLoadMatrixd() with the
423 // precalculated matrix for each tile rather than doing a push(), translate(),
424 // pop() for every fragment.
426 // Panel status defaults to off for now until it gets a bit more developed.
428 // Extract OpenGL driver info on initialization.
430 // Revision 1.21 1998/06/27 16:54:33 curt
431 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
432 // Don't change the view port when displaying the panel.
434 // Revision 1.20 1998/06/17 21:35:12 curt
435 // Refined conditional audio support compilation.
436 // Moved texture parameter setup calls to ../Scenery/materials.cxx
437 // #include <string.h> before various STL includes.
438 // Make HUD default state be enabled.
440 // Revision 1.19 1998/06/08 17:57:05 curt
441 // Minor sound/startup position tweaks.
443 // Revision 1.18 1998/06/03 00:47:14 curt
444 // Updated to compile in audio support if OSS available.
445 // Updated for new version of Steve's audio library.
446 // STL includes don't use .h
447 // Small view optimizations.
449 // Revision 1.17 1998/06/01 17:54:42 curt
450 // Added Linux audio support.
451 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
454 // Revision 1.16 1998/05/29 20:37:24 curt
455 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
456 // Read airport list into a "map" STL for dynamic list sizing and fast tree
459 // Revision 1.15 1998/05/22 21:28:53 curt
460 // Modifications to use the new fgEVENT_MGR class.
462 // Revision 1.14 1998/05/20 20:51:35 curt
463 // Tweaked smooth shaded texture lighting properties.
464 // Converted fgLIGHT to a C++ class.
466 // Revision 1.13 1998/05/16 13:08:35 curt
467 // C++ - ified views.[ch]xx
468 // Shuffled some additional view parameters into the fgVIEW class.
469 // Changed tile-radius to tile-diameter because it is a much better
471 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
472 // to transform world space to eye space for view frustum culling.
474 // Revision 1.12 1998/05/13 18:29:58 curt
475 // Added a keyboard binding to dynamically adjust field of view.
476 // Added a command line option to specify fov.
477 // Adjusted terrain color.
478 // Root path info moved to fgOPTIONS.
479 // Added ability to parse options out of a config file.
481 // Revision 1.11 1998/05/07 23:14:15 curt
482 // Added "D" key binding to set autopilot heading.
483 // Made frame rate calculation average out over last 10 frames.
484 // Borland C++ floating point exception workaround.
485 // Added a --tile-radius=n option.
487 // Revision 1.10 1998/05/06 03:16:24 curt
488 // Added an averaged global frame rate counter.
489 // Added an option to control tile radius.
491 // Revision 1.9 1998/05/03 00:47:31 curt
492 // Added an option to enable/disable full-screen mode.
494 // Revision 1.8 1998/04/30 12:34:18 curt
495 // Added command line rendering options:
496 // enable/disable fog/haze
497 // specify smooth/flat shading
498 // disable sky blending and just use a solid color
499 // enable wireframe drawing mode
501 // Revision 1.7 1998/04/28 01:20:22 curt
502 // Type-ified fgTIME and fgVIEW.
503 // Added a command line option to disable textures.
505 // Revision 1.6 1998/04/26 05:10:03 curt
506 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
508 // Revision 1.5 1998/04/25 22:06:30 curt
509 // Edited cvs log messages in source files ... bad bad bad!
511 // Revision 1.4 1998/04/25 20:24:01 curt
512 // Cleaned up initialization sequence to eliminate interdependencies
513 // between sun position, lighting, and view position. This creates a
514 // valid single pass initialization path.
516 // Revision 1.3 1998/04/25 15:11:11 curt
517 // Added an command line option to set starting position based on airport ID.
519 // Revision 1.2 1998/04/24 00:49:20 curt
520 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
521 // Trying out some different option parsing code.
522 // Some code reorganization.
524 // Revision 1.1 1998/04/22 13:25:44 curt
525 // C++ - ifing the code.
526 // Starting a bit of reorganization of lighting code.
528 // Revision 1.56 1998/04/18 04:11:28 curt
529 // Moved fg_debug to it's own library, added zlib support.
531 // Revision 1.55 1998/04/14 02:21:03 curt
532 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
533 // <jgoeke@voyager.net>
535 // Revision 1.54 1998/04/08 23:35:36 curt
536 // Tweaks to Gnu automake/autoconf system.
538 // Revision 1.53 1998/04/03 22:09:06 curt
539 // Converting to Gnu autoconf system.
541 // Revision 1.52 1998/03/23 21:24:38 curt
542 // Source code formating tweaks.
544 // Revision 1.51 1998/03/14 00:31:22 curt
545 // Beginning initial terrain texturing experiments.
547 // Revision 1.50 1998/03/09 22:46:19 curt
550 // Revision 1.49 1998/02/23 19:07:59 curt
551 // Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
552 // calculation code between sun display, and other FG sections that use this
553 // for things like lighting.
555 // Revision 1.48 1998/02/21 14:53:15 curt
556 // Added Charlie's HUD changes.
558 // Revision 1.47 1998/02/19 13:05:53 curt
559 // Incorporated some HUD tweaks from Michelle America.
560 // Tweaked the sky's sunset/rise colors.
561 // Other misc. tweaks.
563 // Revision 1.46 1998/02/18 15:07:06 curt
564 // Tweaks to build with SGI OpenGL (and therefor hopefully other accelerated
565 // drivers will work.)
567 // Revision 1.45 1998/02/16 13:39:43 curt
568 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
569 // tiles to occasionally be missing.
571 // Revision 1.44 1998/02/12 21:59:50 curt
572 // Incorporated code changes contributed by Charlie Hotchkiss
573 // <chotchkiss@namg.us.anritsu.com>
575 // Revision 1.43 1998/02/11 02:50:40 curt
578 // Revision 1.42 1998/02/09 22:56:58 curt
579 // Removed "depend" files from cvs control. Other minor make tweaks.
581 // Revision 1.41 1998/02/09 15:07:50 curt
584 // Revision 1.40 1998/02/07 15:29:44 curt
585 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
586 // <chotchkiss@namg.us.anritsu.com>
588 // Revision 1.39 1998/02/03 23:20:25 curt
589 // Lots of little tweaks to fix various consistency problems discovered by
590 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
591 // passed arguments along to the real printf(). Also incorporated HUD changes
592 // by Michele America.
594 // Revision 1.38 1998/02/02 20:53:58 curt
595 // Incorporated Durk's changes.
597 // Revision 1.37 1998/02/01 03:39:54 curt
600 // Revision 1.36 1998/01/31 00:43:13 curt
601 // Added MetroWorks patches from Carmen Volpe.
603 // Revision 1.35 1998/01/27 00:47:57 curt
604 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
605 // system and commandline/config file processing code.
607 // Revision 1.34 1998/01/22 02:59:37 curt
608 // Changed #ifdef FILE_H to #ifdef _FILE_H
610 // Revision 1.33 1998/01/21 21:11:34 curt
613 // Revision 1.32 1998/01/19 19:27:08 curt
614 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
615 // This should simplify things tremendously.
617 // Revision 1.31 1998/01/19 18:40:32 curt
618 // Tons of little changes to clean up the code and to remove fatal errors
619 // when building with the c++ compiler.
621 // Revision 1.30 1998/01/13 00:23:09 curt
622 // Initial changes to support loading and management of scenery tiles. Note,
623 // there's still a fair amount of work left to be done.
625 // Revision 1.29 1998/01/08 02:22:08 curt
626 // Beginning to integrate Tile management subsystem.
628 // Revision 1.28 1998/01/07 03:18:58 curt
629 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
631 // Revision 1.27 1998/01/05 18:44:35 curt
632 // Add an option to advance/decrease time from keyboard.
634 // Revision 1.26 1997/12/30 23:09:04 curt
635 // Tweaking initialization sequences.
637 // Revision 1.25 1997/12/30 22:22:33 curt
638 // Further integration of event manager.
640 // Revision 1.24 1997/12/30 20:47:44 curt
641 // Integrated new event manager with subsystem initializations.
643 // Revision 1.23 1997/12/30 16:36:50 curt
644 // Merged in Durk's changes ...
646 // Revision 1.22 1997/12/19 23:34:05 curt
647 // Lot's of tweaking with sky rendering and lighting.
649 // Revision 1.21 1997/12/19 16:45:00 curt
650 // Working on scene rendering order and options.
652 // Revision 1.20 1997/12/18 23:32:33 curt
653 // First stab at sky dome actually starting to look reasonable. :-)
655 // Revision 1.19 1997/12/17 23:13:36 curt
656 // Began working on rendering a sky.
658 // Revision 1.18 1997/12/15 23:54:49 curt
659 // Add xgl wrappers for debugging.
660 // Generate terrain normals on the fly.
662 // Revision 1.17 1997/12/15 20:59:09 curt
665 // Revision 1.16 1997/12/12 19:52:48 curt
666 // Working on lightling and material properties.
668 // Revision 1.15 1997/12/11 04:43:55 curt
669 // Fixed sun vector and lighting problems. I thing the moon is now lit
672 // Revision 1.14 1997/12/10 22:37:47 curt
673 // Prepended "fg" on the name of all global structures that didn't have it yet.
674 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
676 // Revision 1.13 1997/11/25 19:25:32 curt
677 // Changes to integrate Durk's moon/sun code updates + clean up.
679 // Revision 1.12 1997/11/15 18:16:35 curt
682 // Revision 1.11 1997/10/30 12:38:42 curt
683 // Working on new scenery subsystem.
685 // Revision 1.10 1997/10/25 03:24:23 curt
686 // Incorporated sun, moon, and star positioning code contributed by Durk Talsma.
688 // Revision 1.9 1997/09/23 00:29:39 curt
689 // Tweaks to get things to compile with gcc-win32.
691 // Revision 1.8 1997/09/22 14:44:20 curt
692 // Continuing to try to align stars correctly.
694 // Revision 1.7 1997/09/16 15:50:30 curt
695 // Working on star alignment and time issues.
697 // Revision 1.6 1997/09/05 14:17:30 curt
698 // More tweaking with stars.
700 // Revision 1.5 1997/09/04 02:17:36 curt
703 // Revision 1.4 1997/08/27 21:32:26 curt
704 // Restructured view calculation code. Added stars.
706 // Revision 1.3 1997/08/27 03:30:19 curt
707 // Changed naming scheme of basic shared structures.
709 // Revision 1.2 1997/08/25 20:27:23 curt
710 // Merged in initial HUD and Joystick code.
712 // Revision 1.1 1997/08/23 01:46:20 curt