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.h>
46 #include <Astro/moon.hxx>
47 #include <Astro/planets.hxx>
48 #include <Astro/sky.hxx>
49 #include <Astro/stars.hxx>
50 #include <Astro/sun.hxx>
51 #include <Autopilot/autopilot.h>
52 #include <Cockpit/cockpit.hxx>
53 #include <Debug/fg_debug.h>
54 #include <Joystick/joystick.h>
55 #include <Math/fg_geodesy.h>
56 #include <Math/fg_random.h>
57 #include <Math/polar3d.hxx>
58 #include <Scenery/scenery.hxx>
59 #include <Scenery/tilemgr.hxx>
60 #include <Time/event.hxx>
61 #include <Time/fg_time.hxx>
62 #include <Time/light.hxx>
63 #include <Time/sunpos.hxx>
64 #include <Weather/weather.h>
66 #include "airports.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 current_options.get_airport_id(id);
84 // set initial position from airport id
89 fgPrintf( FG_GENERAL, FG_INFO,
90 "Attempting to set starting position from airport code %s.\n",
93 airports.load("Airports");
94 a = airports.search(id);
95 if ( (fabs(a.longitude) < FG_EPSILON) &&
96 (fabs(a.latitude) < FG_EPSILON) &&
97 (fabs(a.elevation) < FG_EPSILON) ) {
98 fgPrintf( FG_GENERAL, FG_EXIT,
99 "Failed to find %s in database.\n", id);
101 FG_Longitude = ( a.longitude ) * DEG_TO_RAD;
102 FG_Latitude = ( a.latitude ) * DEG_TO_RAD;
105 // set initial position from default or command line coordinates
107 FG_Longitude = current_options.get_lon() * DEG_TO_RAD;
108 FG_Latitude = current_options.get_lat() * DEG_TO_RAD;
111 printf("starting altitude is = %.2f\n", current_options.get_altitude());
113 FG_Altitude = current_options.get_altitude() * METER_TO_FEET;
114 FG_Runway_altitude = FG_Altitude - 3.758099;
116 fgPrintf( FG_GENERAL, FG_INFO,
117 "Initial position is: (%.4f, %.4f, %.2f)\n",
118 FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG,
119 FG_Altitude * FEET_TO_METER);
125 // General house keeping initializations
126 int fgInitGeneral( void ) {
133 fgPrintf( FG_GENERAL, FG_INFO, "General Initialization\n" );
134 fgPrintf( FG_GENERAL, FG_INFO, "======= ==============\n" );
136 g->glVendor = (char *)glGetString ( GL_VENDOR );
137 g->glRenderer = (char *)glGetString ( GL_RENDERER );
138 g->glVersion = (char *)glGetString ( GL_VERSION );
140 current_options.get_fg_root(root);
141 if ( !strlen(root) ) {
142 // No root path set? Then bail ...
143 fgPrintf( FG_GENERAL, FG_EXIT, "%s %s\n",
144 "Cannot continue without environment variable FG_ROOT",
147 fgPrintf( FG_GENERAL, FG_INFO, "FG_ROOT = %s\n\n", root);
149 // prime the frame rate counter pump
150 for ( i = 0; i < FG_FRAME_RATE_HISTORY; i++ ) {
158 // convert a geodetic point lon(radians), lat(radians), elev(meter) to
160 fgPoint3d geod_to_cart(double geod[3]) {
163 double gc_lon, gc_lat, sl_radius;
165 // printf("A geodetic point is (%.2f, %.2f, %.2f)\n",
166 // geod[0], geod[1], geod[2]);
169 fgGeodToGeoc(geod[1], geod[2], &sl_radius, &gc_lat);
171 // printf("A geocentric point is (%.2f, %.2f, %.2f)\n", gc_lon,
172 // gc_lat, sl_radius+geod[2]);
176 pp.radius = sl_radius + geod[2];
177 cp = fgPolarToCart3d(pp);
179 // printf("A cart point is (%.8f, %.8f, %.8f)\n", cp.x, cp.y, cp.z);
185 // This is the top level init routine which calls all the other
186 // initialization routines. If you are adding a subsystem to flight
187 // gear, its initialization call should located in this routine.
188 // Returns non-zero if a problem encountered.
189 int fgInitSubsystems( void ) {
195 fgPoint3d abs_view_pos;
197 l = &cur_light_params;
198 t = &cur_time_params;
201 fgPrintf( FG_GENERAL, FG_INFO, "Initialize Subsystems\n");
202 fgPrintf( FG_GENERAL, FG_INFO, "========== ==========\n");
204 // seed the random number generater
207 // allocates structures so must happen before any of the flight
208 // model or control parameters are set
209 fgAircraftInit(); // In the future this might not be the case.
210 f = current_aircraft.flight;
212 // set the initial position
215 // Initialize the Scenery Management subsystem
216 if ( fgSceneryInit() ) {
217 // Scenery initialized ok.
219 fgPrintf( FG_GENERAL, FG_EXIT, "Error in Scenery initialization!\n" );
222 if( fgTileMgrInit() ) {
223 // Load the local scenery data
226 fgPrintf( FG_GENERAL, FG_EXIT,
227 "Error in Tile Manager initialization!\n" );
230 // calculalate a cartesian point somewhere along the line between
231 // the center of the earth and our view position
232 geod_pos[0] = FG_Longitude;
233 geod_pos[1] = FG_Latitude;
234 // doesn't have to be the exact elevation (this is good because we
235 // don't know it yet :-)
237 abs_view_pos = geod_to_cart(geod_pos);
239 // Calculate ground elevation at starting point
241 fgTileMgrCurElev( FG_Longitude, FG_Latitude, &abs_view_pos );
242 FG_Runway_altitude = scenery.cur_elev * METER_TO_FEET;
244 // Reset our altitude if we are below ground
245 if ( FG_Altitude < FG_Runway_altitude + 3.758099) {
246 FG_Altitude = FG_Runway_altitude + 3.758099;
249 fgPrintf( FG_GENERAL, FG_INFO,
250 "Updated position (after elevation adj): (%.4f, %.4f, %.2f)\n",
251 FG_Latitude * RAD_TO_DEG, FG_Longitude * RAD_TO_DEG,
252 FG_Altitude * FEET_TO_METER);
253 // end of thing that I just stuck in that I should probably move
255 // The following section sets up the flight model EOM parameters
256 // and should really be read in from one or more files.
259 FG_V_north = 0.0; // 7.287719E+00
260 FG_V_east = 0.0; // 1.521770E+03
261 FG_V_down = 0.0; // -1.265722E-05
263 // Initial Orientation
264 FG_Phi = current_options.get_roll() * DEG_TO_RAD;
265 FG_Theta = current_options.get_pitch() * DEG_TO_RAD;
266 FG_Psi = current_options.get_heading() * DEG_TO_RAD;
268 // Initial Angular B rates
269 FG_P_body = 7.206685E-05;
270 FG_Q_body = 0.000000E+00;
271 FG_R_body = 9.492658E-05;
273 FG_Earth_position_angle = 0.000000E+00;
275 // Mass properties and geometry values
276 FG_Mass = 8.547270E+01;
277 FG_I_xx = 1.048000E+03;
278 FG_I_yy = 3.000000E+03;
279 FG_I_zz = 3.530000E+03;
280 FG_I_xz = 0.000000E+00;
282 // CG position w.r.t. ref. point
283 FG_Dx_cg = 0.000000E+00;
284 FG_Dy_cg = 0.000000E+00;
285 FG_Dz_cg = 0.000000E+00;
287 // Initialize the event manager
288 global_events.Init();
290 // Output event stats every 60 seconds
291 global_events.Register( "fgEventPrintStats()", fgEventPrintStats,
292 FG_EVENT_READY, 60000 );
294 // Initialize the time dependent variables
298 // Initialize view parameters
300 v->UpdateViewMath(f);
301 v->UpdateWorldToEye(f);
303 // Initialize the orbital elements of sun, moon and mayor planets
304 fgSolarSystemInit(*t);
306 // Initialize the Stars subsystem
307 if( fgStarsInit() ) {
308 // Stars initialized ok.
310 fgPrintf( FG_GENERAL, FG_EXIT, "Error in Stars initialization!\n" );
313 // Initialize the planetary subsystem
314 global_events.Register( "fgPlanetsInit()", fgPlanetsInit,
315 FG_EVENT_READY, 600000);
317 // Initialize the sun's position
318 global_events.Register( "fgSunInit()", fgSunInit,
319 FG_EVENT_READY, 30000 );
321 // Intialize the moon's position
322 global_events.Register( "fgMoonInit()", fgMoonInit,
323 FG_EVENT_READY, 600000 );
325 // fgUpdateSunPos() needs a few position and view parameters set
326 // so it can calculate local relative sun angle and a few other
327 // things for correctly orienting the sky.
330 // Initialize Lighting interpolation tables
333 // update the lighting parameters (based on sun angle)
334 global_events.Register( "fgLightUpdate()", fgLightUpdate,
335 FG_EVENT_READY, 30000 );
337 // Initialize the weather modeling subsystem
340 // update the weather for our current position
341 global_events.Register( "fgWeatherUpdate()", fgWeatherUpdate,
342 FG_EVENT_READY, 120000 );
344 // Initialize the Cockpit subsystem
345 if( fgCockpitInit( ¤t_aircraft )) {
346 // Cockpit initialized ok.
348 fgPrintf( FG_GENERAL, FG_EXIT, "Error in Cockpit initialization!\n" );
351 // Initialize the "sky"
354 // Initialize the flight model subsystem data structures base on
357 fgFlightModelInit( current_options.get_flight_model(), f,
358 1.0 / DEFAULT_MODEL_HZ );
360 // I'm just sticking this here for now, it should probably move
362 scenery.cur_elev = FG_Runway_altitude * FEET_TO_METER;
364 if ( FG_Altitude < FG_Runway_altitude + 3.758099) {
365 FG_Altitude = FG_Runway_altitude + 3.758099;
368 fgPrintf( FG_GENERAL, FG_INFO,
369 "Updated position (after elevation adj): (%.4f, %.4f, %.2f)\n",
370 FG_Latitude * RAD_TO_DEG, FG_Longitude * RAD_TO_DEG,
371 FG_Altitude * FEET_TO_METER);
372 // end of thing that I just stuck in that I should probably move
375 if (fgJoystickInit(0) ) {
376 // Joystick initialized ok.
378 fgPrintf( FG_GENERAL, FG_EXIT, "Error in Joystick initialization!\n" );
381 // Autopilot init added here, by Jeff Goeke-Smith
382 fgAPInit(¤t_aircraft);
384 fgPrintf(FG_GENERAL, FG_INFO,"\n");
391 // Revision 1.31 1998/08/22 14:49:57 curt
392 // Attempting to iron out seg faults and crashes.
393 // Did some shuffling to fix a initialization order problem between view
394 // position, scenery elevation.
396 // Revision 1.30 1998/08/20 20:32:33 curt
397 // Reshuffled some of the code in and around views.[ch]xx
399 // Revision 1.29 1998/07/30 23:48:27 curt
400 // Output position & orientation when pausing.
401 // Eliminated libtool use.
402 // Added options to specify initial position and orientation.
403 // Changed default fov to 55 degrees.
404 // Added command line option to start in paused or unpaused state.
406 // Revision 1.28 1998/07/27 18:41:25 curt
407 // Added a pause command "p"
408 // Fixed some initialization order problems between pui and glut.
409 // Added an --enable/disable-sound option.
411 // Revision 1.27 1998/07/24 21:39:10 curt
412 // Debugging output tweaks.
413 // Cast glGetString to (char *) to avoid compiler errors.
414 // Optimizations to fgGluLookAt() by Norman Vine.
416 // Revision 1.26 1998/07/22 21:40:44 curt
417 // Clear to adjusted fog color (for sunrise/sunset effects)
418 // Make call to fog sunrise/sunset adjustment method.
419 // Add a stdc++ library bug work around to fg_init.cxx
421 // Revision 1.25 1998/07/13 21:01:38 curt
422 // Wrote access functions for current fgOPTIONS.
424 // Revision 1.24 1998/07/13 15:32:39 curt
425 // Clear color buffer if drawing wireframe.
426 // When specifying and airport, start elevation at -1000 and let the system
427 // position you at ground level.
429 // Revision 1.23 1998/07/12 03:14:43 curt
430 // Added ground collision detection.
431 // Did some serious horsing around to be able to "hug" the ground properly
432 // and still be able to take off.
433 // Set the near clip plane to 1.0 meters when less than 10 meters above the
435 // Did some serious horsing around getting the initial airplane position to be
436 // correct based on rendered terrain elevation.
437 // Added a little cheat/hack that will prevent the view position from ever
438 // dropping below the terrain, even when the flight model doesn't quite
439 // put you as high as you'd like.
441 // Revision 1.22 1998/07/04 00:52:25 curt
442 // Add my own version of gluLookAt() (which is nearly identical to the
443 // Mesa/glu version.) But, by calculating the Model View matrix our selves
444 // we can save this matrix without having to read it back in from the video
445 // card. This hopefully allows us to save a few cpu cycles when rendering
446 // out the fragments because we can just use glLoadMatrixd() with the
447 // precalculated matrix for each tile rather than doing a push(), translate(),
448 // pop() for every fragment.
450 // Panel status defaults to off for now until it gets a bit more developed.
452 // Extract OpenGL driver info on initialization.
454 // Revision 1.21 1998/06/27 16:54:33 curt
455 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
456 // Don't change the view port when displaying the panel.
458 // Revision 1.20 1998/06/17 21:35:12 curt
459 // Refined conditional audio support compilation.
460 // Moved texture parameter setup calls to ../Scenery/materials.cxx
461 // #include <string.h> before various STL includes.
462 // Make HUD default state be enabled.
464 // Revision 1.19 1998/06/08 17:57:05 curt
465 // Minor sound/startup position tweaks.
467 // Revision 1.18 1998/06/03 00:47:14 curt
468 // Updated to compile in audio support if OSS available.
469 // Updated for new version of Steve's audio library.
470 // STL includes don't use .h
471 // Small view optimizations.
473 // Revision 1.17 1998/06/01 17:54:42 curt
474 // Added Linux audio support.
475 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
478 // Revision 1.16 1998/05/29 20:37:24 curt
479 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
480 // Read airport list into a "map" STL for dynamic list sizing and fast tree
483 // Revision 1.15 1998/05/22 21:28:53 curt
484 // Modifications to use the new fgEVENT_MGR class.
486 // Revision 1.14 1998/05/20 20:51:35 curt
487 // Tweaked smooth shaded texture lighting properties.
488 // Converted fgLIGHT to a C++ class.
490 // Revision 1.13 1998/05/16 13:08:35 curt
491 // C++ - ified views.[ch]xx
492 // Shuffled some additional view parameters into the fgVIEW class.
493 // Changed tile-radius to tile-diameter because it is a much better
495 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
496 // to transform world space to eye space for view frustum culling.
498 // Revision 1.12 1998/05/13 18:29:58 curt
499 // Added a keyboard binding to dynamically adjust field of view.
500 // Added a command line option to specify fov.
501 // Adjusted terrain color.
502 // Root path info moved to fgOPTIONS.
503 // Added ability to parse options out of a config file.
505 // Revision 1.11 1998/05/07 23:14:15 curt
506 // Added "D" key binding to set autopilot heading.
507 // Made frame rate calculation average out over last 10 frames.
508 // Borland C++ floating point exception workaround.
509 // Added a --tile-radius=n option.
511 // Revision 1.10 1998/05/06 03:16:24 curt
512 // Added an averaged global frame rate counter.
513 // Added an option to control tile radius.
515 // Revision 1.9 1998/05/03 00:47:31 curt
516 // Added an option to enable/disable full-screen mode.
518 // Revision 1.8 1998/04/30 12:34:18 curt
519 // Added command line rendering options:
520 // enable/disable fog/haze
521 // specify smooth/flat shading
522 // disable sky blending and just use a solid color
523 // enable wireframe drawing mode
525 // Revision 1.7 1998/04/28 01:20:22 curt
526 // Type-ified fgTIME and fgVIEW.
527 // Added a command line option to disable textures.
529 // Revision 1.6 1998/04/26 05:10:03 curt
530 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
532 // Revision 1.5 1998/04/25 22:06:30 curt
533 // Edited cvs log messages in source files ... bad bad bad!
535 // Revision 1.4 1998/04/25 20:24:01 curt
536 // Cleaned up initialization sequence to eliminate interdependencies
537 // between sun position, lighting, and view position. This creates a
538 // valid single pass initialization path.
540 // Revision 1.3 1998/04/25 15:11:11 curt
541 // Added an command line option to set starting position based on airport ID.
543 // Revision 1.2 1998/04/24 00:49:20 curt
544 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
545 // Trying out some different option parsing code.
546 // Some code reorganization.
548 // Revision 1.1 1998/04/22 13:25:44 curt
549 // C++ - ifing the code.
550 // Starting a bit of reorganization of lighting code.
552 // Revision 1.56 1998/04/18 04:11:28 curt
553 // Moved fg_debug to it's own library, added zlib support.
555 // Revision 1.55 1998/04/14 02:21:03 curt
556 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
557 // <jgoeke@voyager.net>
559 // Revision 1.54 1998/04/08 23:35:36 curt
560 // Tweaks to Gnu automake/autoconf system.
562 // Revision 1.53 1998/04/03 22:09:06 curt
563 // Converting to Gnu autoconf system.
565 // Revision 1.52 1998/03/23 21:24:38 curt
566 // Source code formating tweaks.
568 // Revision 1.51 1998/03/14 00:31:22 curt
569 // Beginning initial terrain texturing experiments.
571 // Revision 1.50 1998/03/09 22:46:19 curt
574 // Revision 1.49 1998/02/23 19:07:59 curt
575 // Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
576 // calculation code between sun display, and other FG sections that use this
577 // for things like lighting.
579 // Revision 1.48 1998/02/21 14:53:15 curt
580 // Added Charlie's HUD changes.
582 // Revision 1.47 1998/02/19 13:05:53 curt
583 // Incorporated some HUD tweaks from Michelle America.
584 // Tweaked the sky's sunset/rise colors.
585 // Other misc. tweaks.
587 // Revision 1.46 1998/02/18 15:07:06 curt
588 // Tweaks to build with SGI OpenGL (and therefor hopefully other accelerated
589 // drivers will work.)
591 // Revision 1.45 1998/02/16 13:39:43 curt
592 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
593 // tiles to occasionally be missing.
595 // Revision 1.44 1998/02/12 21:59:50 curt
596 // Incorporated code changes contributed by Charlie Hotchkiss
597 // <chotchkiss@namg.us.anritsu.com>
599 // Revision 1.43 1998/02/11 02:50:40 curt
602 // Revision 1.42 1998/02/09 22:56:58 curt
603 // Removed "depend" files from cvs control. Other minor make tweaks.
605 // Revision 1.41 1998/02/09 15:07:50 curt
608 // Revision 1.40 1998/02/07 15:29:44 curt
609 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
610 // <chotchkiss@namg.us.anritsu.com>
612 // Revision 1.39 1998/02/03 23:20:25 curt
613 // Lots of little tweaks to fix various consistency problems discovered by
614 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
615 // passed arguments along to the real printf(). Also incorporated HUD changes
616 // by Michele America.
618 // Revision 1.38 1998/02/02 20:53:58 curt
619 // Incorporated Durk's changes.
621 // Revision 1.37 1998/02/01 03:39:54 curt
624 // Revision 1.36 1998/01/31 00:43:13 curt
625 // Added MetroWorks patches from Carmen Volpe.
627 // Revision 1.35 1998/01/27 00:47:57 curt
628 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
629 // system and commandline/config file processing code.
631 // Revision 1.34 1998/01/22 02:59:37 curt
632 // Changed #ifdef FILE_H to #ifdef _FILE_H
634 // Revision 1.33 1998/01/21 21:11:34 curt
637 // Revision 1.32 1998/01/19 19:27:08 curt
638 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
639 // This should simplify things tremendously.
641 // Revision 1.31 1998/01/19 18:40:32 curt
642 // Tons of little changes to clean up the code and to remove fatal errors
643 // when building with the c++ compiler.
645 // Revision 1.30 1998/01/13 00:23:09 curt
646 // Initial changes to support loading and management of scenery tiles. Note,
647 // there's still a fair amount of work left to be done.
649 // Revision 1.29 1998/01/08 02:22:08 curt
650 // Beginning to integrate Tile management subsystem.
652 // Revision 1.28 1998/01/07 03:18:58 curt
653 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
655 // Revision 1.27 1998/01/05 18:44:35 curt
656 // Add an option to advance/decrease time from keyboard.
658 // Revision 1.26 1997/12/30 23:09:04 curt
659 // Tweaking initialization sequences.
661 // Revision 1.25 1997/12/30 22:22:33 curt
662 // Further integration of event manager.
664 // Revision 1.24 1997/12/30 20:47:44 curt
665 // Integrated new event manager with subsystem initializations.
667 // Revision 1.23 1997/12/30 16:36:50 curt
668 // Merged in Durk's changes ...
670 // Revision 1.22 1997/12/19 23:34:05 curt
671 // Lot's of tweaking with sky rendering and lighting.
673 // Revision 1.21 1997/12/19 16:45:00 curt
674 // Working on scene rendering order and options.
676 // Revision 1.20 1997/12/18 23:32:33 curt
677 // First stab at sky dome actually starting to look reasonable. :-)
679 // Revision 1.19 1997/12/17 23:13:36 curt
680 // Began working on rendering a sky.
682 // Revision 1.18 1997/12/15 23:54:49 curt
683 // Add xgl wrappers for debugging.
684 // Generate terrain normals on the fly.
686 // Revision 1.17 1997/12/15 20:59:09 curt
689 // Revision 1.16 1997/12/12 19:52:48 curt
690 // Working on lightling and material properties.
692 // Revision 1.15 1997/12/11 04:43:55 curt
693 // Fixed sun vector and lighting problems. I thing the moon is now lit
696 // Revision 1.14 1997/12/10 22:37:47 curt
697 // Prepended "fg" on the name of all global structures that didn't have it yet.
698 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
700 // Revision 1.13 1997/11/25 19:25:32 curt
701 // Changes to integrate Durk's moon/sun code updates + clean up.
703 // Revision 1.12 1997/11/15 18:16:35 curt
706 // Revision 1.11 1997/10/30 12:38:42 curt
707 // Working on new scenery subsystem.
709 // Revision 1.10 1997/10/25 03:24:23 curt
710 // Incorporated sun, moon, and star positioning code contributed by Durk Talsma.
712 // Revision 1.9 1997/09/23 00:29:39 curt
713 // Tweaks to get things to compile with gcc-win32.
715 // Revision 1.8 1997/09/22 14:44:20 curt
716 // Continuing to try to align stars correctly.
718 // Revision 1.7 1997/09/16 15:50:30 curt
719 // Working on star alignment and time issues.
721 // Revision 1.6 1997/09/05 14:17:30 curt
722 // More tweaking with stars.
724 // Revision 1.5 1997/09/04 02:17:36 curt
727 // Revision 1.4 1997/08/27 21:32:26 curt
728 // Restructured view calculation code. Added stars.
730 // Revision 1.3 1997/08/27 03:30:19 curt
731 // Changed naming scheme of basic shared structures.
733 // Revision 1.2 1997/08/25 20:27:23 curt
734 // Merged in initial HUD and Joystick code.
736 // Revision 1.1 1997/08/23 01:46:20 curt