3 // GLUTmain.cxx -- top level sim routines
5 // Written by Curtis Olson for OpenGL, started May 1997.
7 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
9 // This program is free software; you can redistribute it and/or
10 // modify it under the terms of the GNU General Public License as
11 // published by the Free Software Foundation; either version 2 of the
12 // License, or (at your option) any later version.
14 // This program is distributed in the hope that it will be useful, but
15 // WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 // General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software
21 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 // (Log is kept at end of this file)
46 #include <sys/stat.h> /* for stat() */
49 # include <unistd.h> /* for stat() */
52 #include <Include/fg_constants.h> // for VERSION
53 #include <Include/general.h>
55 #include <Aircraft/aircraft.h>
56 #include <Astro/moon.hxx>
57 #include <Astro/planets.hxx>
58 #include <Astro/sky.hxx>
59 #include <Astro/stars.hxx>
60 #include <Astro/sun.hxx>
62 #ifdef ENABLE_AUDIO_SUPPORT
63 # include <Audio/src/sl.h>
64 # include <Audio/src/sm.h>
67 #include <Cockpit/cockpit.hxx>
68 #include <Debug/fg_debug.h>
70 #include <Joystick/joystick.h>
71 #include <Math/fg_geodesy.h>
72 #include <Math/mat3.h>
73 #include <Math/polar3d.hxx>
75 #include <Scenery/scenery.hxx>
76 #include <Scenery/tilemgr.hxx>
77 #include <Time/event.hxx>
78 #include <Time/fg_time.hxx>
79 #include <Time/fg_timer.hxx>
80 #include <Time/sunpos.hxx>
81 #include <Weather/weather.h>
83 #include "GLUTkey.hxx"
84 #include "fg_init.hxx"
85 #include "options.hxx"
90 // This is a record containing global housekeeping information
93 // Specify our current idle function state. This is used to run all
94 // our initializations out of the glutIdleLoop() so that we can get a
95 // splash screen up and running right away.
96 static idle_state = 0;
101 // Global structures for the Audio library
102 #ifdef ENABLE_AUDIO_SUPPORT
103 slScheduler *audio_sched;
104 smMixer *audio_mixer;
110 // The following defines flight gear options. Because glutlib will also
111 // want to parse its own options, those options must not be included here
112 // or they will get parsed by the main program option parser. Hence case
113 // is significant for any option added that might be in conflict with
116 // glutlib parses for:
118 // -direct (invalid in Win32)
122 // -indirect (invalid in Win32)
125 // Note that glutlib depends upon strings while this program's
126 // option parser wants only initial characters followed by numbers
131 // fgInitVisuals() -- Initialize various GL/view parameters
132 static void fgInitVisuals( void ) {
136 l = &cur_light_params;
137 w = ¤t_weather;
139 // Go full screen if requested ...
140 if ( current_options.get_fullscreen() ) {
144 // If enabled, normal vectors specified with glNormal are scaled
145 // to unit length after transformation. See glNormal.
146 // xglEnable( GL_NORMALIZE );
148 xglEnable( GL_LIGHTING );
149 xglEnable( GL_LIGHT0 );
150 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
152 // xglFogi (GL_FOG_MODE, GL_LINEAR);
153 xglFogi (GL_FOG_MODE, GL_EXP2);
154 // Fog density is now set when the weather system is initialized
155 // xglFogf (GL_FOG_DENSITY, w->fog_density);
156 if ( (current_options.get_fog() == 1) ||
157 (current_options.get_shading() == 0) ) {
158 // if fastest fog requested, or if flat shading force fastest
159 xglHint ( GL_FOG_HINT, GL_FASTEST );
160 } else if ( current_options.get_fog() == 2 ) {
161 xglHint ( GL_FOG_HINT, GL_NICEST );
163 if ( current_options.get_wireframe() ) {
165 xglPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
168 // This is the default anyways, but it can't hurt
169 xglFrontFace ( GL_CCW );
172 // xglEnable(GL_POINT_SMOOTH);
173 // xglEnable(GL_LINE_SMOOTH);
174 // xglEnable(GL_POLYGON_SMOOTH);
178 #ifdef IS_THIS_BETTER_THAN_A_ZERO_CHARLIE
179 // Draw a basic instrument panel
180 static void fgUpdateInstrViewParams( void ) {
188 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) / 2);
190 xglMatrixMode(GL_PROJECTION);
194 gluOrtho2D(0, 640, 0, 480);
195 xglMatrixMode(GL_MODELVIEW);
199 xglColor3f(1.0, 1.0, 1.0);
202 xglDisable(GL_DEPTH_TEST);
203 xglDisable(GL_LIGHTING);
206 xglColor3f (0.5, 0.5, 0.5);
209 xglVertex2f(0.0, 0.00);
210 xglVertex2f(0.0, 480.0);
211 xglVertex2f(640.0,480.0);
212 xglVertex2f(640.0, 0.0);
215 xglRectf(0.0,0.0, 640, 480);
216 xglEnable(GL_DEPTH_TEST);
217 xglEnable(GL_LIGHTING);
218 xglMatrixMode(GL_PROJECTION);
220 xglMatrixMode(GL_MODELVIEW);
226 // Update all Visuals (redraws anything graphics related)
227 static void fgRenderFrame( void ) {
233 // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
234 GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
235 GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
236 GLbitfield clear_mask;
238 f = current_aircraft.flight;
239 l = &cur_light_params;
240 t = &cur_time_params;
243 if ( idle_state != 1000 ) {
244 // still initializing, draw the splash screen
245 if ( current_options.get_splash_screen() == 1 ) {
249 // idle_state is now 1000 meaning we've finished all our
250 // initializations and are running the main loop, so this will
251 // now work without seg faulting the system.
253 // printf("Ground = %.2f Altitude = %.2f\n", scenery.cur_elev,
254 // FG_Altitude * FEET_TO_METER);
256 // this is just a temporary hack, to make me understand Pui
257 // timerText -> setLabel (ctime (&t->cur_time));
260 // update view volume parameters
261 v->UpdateViewParams();
263 clear_mask = GL_DEPTH_BUFFER_BIT;
264 if ( current_options.get_wireframe() ) {
265 clear_mask |= GL_COLOR_BUFFER_BIT;
267 if ( current_options.get_skyblend() ) {
268 if ( current_options.get_textures() ) {
269 // glClearColor(black[0], black[1], black[2], black[3]);
270 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
271 l->adj_fog_color[2], l->adj_fog_color[3]);
272 clear_mask |= GL_COLOR_BUFFER_BIT;
275 glClearColor(l->sky_color[0], l->sky_color[1],
276 l->sky_color[2], l->sky_color[3]);
277 clear_mask |= GL_COLOR_BUFFER_BIT;
279 xglClear( clear_mask );
281 // Tell GL we are switching to model view parameters
282 xglMatrixMode(GL_MODELVIEW);
283 // xglLoadIdentity();
286 xglDisable( GL_DEPTH_TEST );
287 xglDisable( GL_LIGHTING );
288 xglDisable( GL_CULL_FACE );
289 xglDisable( GL_FOG );
290 xglShadeModel( GL_SMOOTH );
291 if ( current_options.get_skyblend() ) {
295 // setup transformation for drawing astronomical objects
297 // Translate to view position
298 xglTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
299 // Rotate based on gst (sidereal time)
300 // note: constant should be 15.041085, Curt thought it was 15
301 angle = t->gst * 15.041085;
302 // printf("Rotating astro objects by %.2f degrees\n",angle);
303 xglRotatef( angle, 0.0, 0.0, -1.0 );
305 // draw stars and planets
313 xglEnable( GL_LIGHTING );
314 xglEnable( GL_LIGHT0 );
315 // set lighting parameters
316 xglLightfv(GL_LIGHT0, GL_AMBIENT, white );
317 xglLightfv(GL_LIGHT0, GL_DIFFUSE, white );
318 xglEnable( GL_CULL_FACE );
320 // Let's try some blending technique's (Durk)
322 glBlendFunc(GL_ONE, GL_ONE);
329 if ( current_options.get_shading() ) {
330 xglShadeModel( GL_SMOOTH );
332 xglShadeModel( GL_FLAT );
334 xglEnable( GL_DEPTH_TEST );
335 if ( current_options.get_fog() > 0 ) {
337 xglFogfv (GL_FOG_COLOR, l->adj_fog_color);
339 // set lighting parameters
340 xglLightfv(GL_LIGHT0, GL_AMBIENT, l->scene_ambient );
341 xglLightfv(GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
343 if ( current_options.get_textures() ) {
344 // texture parameters
345 xglEnable( GL_TEXTURE_2D );
346 xglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
347 xglHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
348 // set base color (I don't think this is doing anything here)
349 xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
350 xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
352 xglDisable( GL_TEXTURE_2D );
353 xglMaterialfv (GL_FRONT, GL_AMBIENT, terrain_color);
354 xglMaterialfv (GL_FRONT, GL_DIFFUSE, terrain_color);
355 // xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
356 // xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
361 xglDisable( GL_TEXTURE_2D );
363 // display HUD && Panel
366 // display instruments
367 // if (!o->panel_status) {
368 // fgUpdateInstrViewParams();
371 // We can do translucent menus, so why not. :-)
372 xglEnable ( GL_BLEND ) ;
373 xglBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
375 xglDisable ( GL_BLEND ) ;
382 // Update internal time dependent calculations (i.e. flight model)
383 void fgUpdateTimeDepCalcs(int multi_loop) {
390 f = current_aircraft.flight;
391 l = &cur_light_params;
392 t = &cur_time_params;
395 // update the flight model
396 if ( multi_loop < 0 ) {
397 multi_loop = DEFAULT_MULTILOOP;
401 // printf("updating flight model x %d\n", multi_loop);
402 fgFlightModelUpdate(current_options.get_flight_model(), f, multi_loop);
404 fgFlightModelUpdate(current_options.get_flight_model(), f, 0);
407 // update the view angle
408 for ( i = 0; i < multi_loop; i++ ) {
409 if ( fabs(v->goal_view_offset - v->view_offset) < 0.05 ) {
410 v->view_offset = v->goal_view_offset;
413 // move v->view_offset towards v->goal_view_offset
414 if ( v->goal_view_offset > v->view_offset ) {
415 if ( v->goal_view_offset - v->view_offset < FG_PI ) {
416 v->view_offset += 0.01;
418 v->view_offset -= 0.01;
421 if ( v->view_offset - v->goal_view_offset < FG_PI ) {
422 v->view_offset -= 0.01;
424 v->view_offset += 0.01;
427 if ( v->view_offset > FG_2PI ) {
428 v->view_offset -= FG_2PI;
429 } else if ( v->view_offset < 0 ) {
430 v->view_offset += FG_2PI;
435 double tmp = -(l->sun_rotation + FG_PI) - (FG_Psi - v->view_offset);
436 while ( tmp < 0.0 ) {
439 while ( tmp > FG_2PI ) {
442 /* printf("Psi = %.2f, viewoffset = %.2f sunrot = %.2f rottosun = %.2f\n",
443 FG_Psi * RAD_TO_DEG, v->view_offset * RAD_TO_DEG,
444 -(l->sun_rotation+FG_PI) * RAD_TO_DEG, tmp * RAD_TO_DEG); */
449 void fgInitTimeDepCalcs( void ) {
452 #ifdef HAVE_SETITIMER
453 fgTimerInit( 1.0 / DEFAULT_TIMER_HZ, fgUpdateTimeDepCalcs );
454 #endif HAVE_SETITIMER
458 static const double alt_adjust_ft = 3.758099;
459 static const double alt_adjust_m = alt_adjust_ft * FEET_TO_METER;
461 // What should we do when we have nothing else to do? Let's get ready
462 // for the next move and update the display?
463 static void fgMainLoop( void ) {
467 static int remainder = 0;
468 int elapsed, multi_loop;
471 // double joy_x, joy_y;
472 // int joy_b1, joy_b2;
474 f = current_aircraft.flight;
476 t = &cur_time_params;
478 fgPrintf( FG_ALL, FG_DEBUG, "Running Main Loop\n");
479 fgPrintf( FG_ALL, FG_DEBUG, "======= ==== ====\n");
481 // Fix elevation. I'm just sticking this here for now, it should
482 // probably move eventually
484 /* printf("Before - ground = %.2f runway = %.2f alt = %.2f\n",
486 FG_Runway_altitude * FEET_TO_METER,
487 FG_Altitude * FEET_TO_METER); */
489 if ( scenery.cur_elev > -9990 ) {
490 if ( FG_Altitude * FEET_TO_METER <
491 (scenery.cur_elev + alt_adjust_m - 3.0) ) {
492 // now set aircraft altitude above ground
493 printf("Current Altitude = %.2f < %.2f forcing to %.2f\n",
494 FG_Altitude * FEET_TO_METER,
495 scenery.cur_elev + alt_adjust_m - 3.0,
496 scenery.cur_elev + alt_adjust_m );
497 fgFlightModelSetAltitude( current_options.get_flight_model(), f,
498 scenery.cur_elev + alt_adjust_m );
500 fgPrintf( FG_ALL, FG_BULK,
501 "<*> resetting altitude to %.0f meters\n",
502 FG_Altitude * FEET_TO_METER);
504 FG_Runway_altitude = scenery.cur_elev * METER_TO_FEET;
507 /* printf("Adjustment - ground = %.2f runway = %.2f alt = %.2f\n",
509 FG_Runway_altitude * FEET_TO_METER,
510 FG_Altitude * FEET_TO_METER); */
516 /* fgJoystickRead( &joy_x, &joy_y, &joy_b1, &joy_b2 );
517 printf( "Joystick X %f Y %f B1 %d B2 %d\n",
518 joy_x, joy_y, joy_b1, joy_b2 );
520 fgAileronSet( joy_x ); */
522 // Get elapsed time for this past frame
523 elapsed = fgGetTimeInterval();
524 fgPrintf( FG_ALL, FG_BULK,
525 "Time interval is = %d, previous remainder is = %d\n",
528 // Calculate frame rate average
529 if ( elapsed > 0.0 ) {
531 for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
532 accum += g->frames[i];
533 // printf("frame[%d] = %.2f\n", i, g->frames[i]);
534 g->frames[i+1] = g->frames[i];
536 g->frames[0] = 1000.0 / (float)elapsed;
537 // printf("frame[0] = %.2f\n", g->frames[0]);
538 accum += g->frames[0];
539 g->frame_rate = accum / (float)FG_FRAME_RATE_HISTORY;
540 // printf("ave = %.2f\n", g->frame_rate);
543 // Calculate model iterations needed for next frame
544 fgPrintf( FG_ALL, FG_DEBUG,
545 "--> Frame rate is = %.2f\n", g->frame_rate);
546 elapsed += remainder;
548 multi_loop = (int)(((float)elapsed * 0.001) * DEFAULT_MODEL_HZ);
549 remainder = elapsed - ((multi_loop*1000) / DEFAULT_MODEL_HZ);
550 fgPrintf( FG_ALL, FG_BULK,
551 "Model iterations needed = %d, new remainder = %d\n",
552 multi_loop, remainder);
554 /* printf("right before fm - ground = %.2f runway = %.2f alt = %.2f\n",
556 FG_Runway_altitude * FEET_TO_METER,
557 FG_Altitude * FEET_TO_METER); */
560 if ( ! use_signals ) {
562 fgUpdateTimeDepCalcs(multi_loop);
565 /* printf("After fm - ground = %.2f runway = %.2f alt = %.2f\n",
567 FG_Runway_altitude * FEET_TO_METER,
568 FG_Altitude * FEET_TO_METER); */
570 // fgAircraftOutputCurrent(a);
572 // see if we need to load any new scenery tiles
575 // Process/manage pending events
576 global_events.Process();
578 // Run audio scheduler
579 #ifdef ENABLE_AUDIO_SUPPORT
580 if ( current_options.get_sound() ) {
581 audio_sched -> update();
588 fgPrintf( FG_ALL, FG_DEBUG, "\n");
592 // This is the top level master main function that is registered as
596 // The first few passes take care of initialization things (a couple
597 // per pass) and once everything has been initialized fgMainLoop from
600 static void fgIdleFunction ( void ) {
605 // printf("idle state == %d\n", idle_state);
607 if ( idle_state == 0 ) {
608 // Initialize the splash screen right away
609 if ( current_options.get_splash_screen() ) {
614 } else if ( idle_state == 1 ) {
615 // Start the intro music
617 if ( current_options.get_intro_music() ) {
618 string lockfile = "/tmp/mpg123.running";
619 string mp3file = current_options.get_fg_root() +
621 string command = "(touch " + lockfile + "; mpg123 " + mp3file +
622 "> /dev/null 2>&1; /bin/rm " + lockfile + ") &";
623 fgPrintf( FG_GENERAL, FG_INFO,
624 "Starting intro music: %s\n", mp3file.c_str() );
625 system ( command.c_str() );
630 } else if ( idle_state == 2 ) {
631 // These are a few miscellaneous things that aren't really
632 // "subsystems" but still need to be initialized.
635 if ( strstr ( g->glRenderer, "Glide" ) ) {
636 grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
641 } else if ( idle_state == 3 ) {
642 // This is the top level init routine which calls all the
643 // other subsystem initialization routines. If you are adding
644 // a subsystem to flight gear, its initialization call should
645 // located in this routine.
646 if( !fgInitSubsystems()) {
647 fgPrintf( FG_GENERAL, FG_EXIT,
648 "Subsystem initializations failed ...\n" );
652 } else if ( idle_state == 4 ) {
653 // setup OpenGL view parameters
657 // init timer routines, signals, etc. Arrange for an alarm
658 // signal to be generated, etc.
659 fgInitTimeDepCalcs();
663 } else if ( idle_state == 5 ) {
666 } else if ( idle_state == 6 ) {
667 // Initialize audio support
668 #ifdef ENABLE_AUDIO_SUPPORT
671 if ( current_options.get_intro_music() ) {
672 // Let's wait for mpg123 to finish
673 string lockfile = "/tmp/mpg123.running";
674 struct stat stat_buf;
676 fgPrintf( FG_GENERAL, FG_INFO,
677 "Waiting for mpg123 player to finish ...\n" );
678 while ( stat(lockfile.c_str(), &stat_buf) == 0 ) {
679 // file exist, wait ...
681 fgPrintf( FG_GENERAL, FG_INFO, ".");
683 fgPrintf( FG_GENERAL, FG_INFO, "\n");
687 audio_sched = new slScheduler ( 8000 );
688 audio_mixer = new smMixer;
689 audio_mixer -> setMasterVolume ( 80 ) ; /* 80% of max volume. */
690 audio_sched -> setSafetyMargin ( 1.0 ) ;
691 string slfile = current_options.get_fg_root() + "/Sounds/wasp.wav";
693 s1 = new slSample ( (char *)slfile.c_str() );
694 printf("Rate = %d Bps = %d Stereo = %d\n",
695 s1 -> getRate(), s1 -> getBps(), s1 -> getStereo());
696 audio_sched -> loopSample ( s1 );
698 // strcpy(slfile, path);
699 // strcat(slfile, "thunder.wav");
700 // s2 -> loadFile ( slfile );
701 // s2 -> adjustVolume(0.5);
702 // audio_sched -> playSample ( s2 );
709 if ( idle_state == 1000 ) {
710 // We've finished all our initialization steps, from now on we
711 // run the main loop.
715 if ( current_options.get_splash_screen() == 1 ) {
722 // Handle new window size or exposure
723 static void fgReshape( int width, int height ) {
728 // Do this so we can call fgReshape(0,0) ourselves without having
729 // to know what the values of width & height are.
730 if ( (height > 0) && (width > 0) ) {
731 v->win_ratio = (GLfloat) width / (GLfloat) height;
735 v->winHeight = height;
737 // Inform gl of our view window size (now handled elsewhere)
738 // xglViewport(0, 0, (GLint)width, (GLint)height);
739 if ( idle_state == 1000 ) {
740 // yes we've finished all our initializations and are running
741 // the main loop, so this will now work without seg faulting
743 v->UpdateViewParams();
746 // xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
750 // Initialize GLUT and define a main window
751 int fgGlutInit( int *argc, char **argv ) {
752 // GLUT will extract all glut specific options so later on we only
753 // need wory about our own.
754 xglutInit(argc, argv);
756 // Define Display Parameters
757 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
759 // Define initial window size
760 xglutInitWindowSize(640, 480);
762 // Initialize windows
763 if ( current_options.get_game_mode() == 0 ) {
764 // Open the regular window
765 xglutCreateWindow("Flight Gear");
767 // Open the cool new 'game mode' window
768 glutGameModeString("width=640 height=480 bpp=16");
776 // Initialize GLUT event handlers
777 int fgGlutInitEvents( void ) {
778 // call fgReshape() on window resizes
779 xglutReshapeFunc( fgReshape );
781 // call GLUTkey() on keyboard event
782 xglutKeyboardFunc( GLUTkey );
783 glutSpecialFunc( GLUTspecialkey );
785 // call guiMouseFunc() whenever our little rodent is used
786 glutMouseFunc ( guiMouseFunc );
787 glutMotionFunc (guiMotionFunc );
788 glutPassiveMotionFunc (guiMotionFunc );
790 // call fgMainLoop() whenever there is
791 // nothing else to do
792 xglutIdleFunc( fgIdleFunction );
795 xglutDisplayFunc( fgRenderFrame );
802 int main( int argc, char **argv ) {
805 f = current_aircraft.flight;
808 _control87(MCW_EM, MCW_EM); /* defined in float.h */
811 // Initialize the debugging output system
814 fgPrintf(FG_GENERAL, FG_INFO, "Flight Gear: Version %s\n\n", VERSION);
816 // Attempt to locate and parse a config file
817 // First check fg_root
818 string config = current_options.get_fg_root() + "/system.fgfsrc";
819 current_options.parse_config_file( config );
821 // Next check home directory
822 char* envp = ::getenv( "HOME" );
823 if ( envp != NULL ) {
825 config += "/.fgfsrc";
826 current_options.parse_config_file( config );
829 // Parse remaining command line options
830 // These will override anything specified in a config file
831 if ( current_options.parse_command_line(argc, argv) !=
832 fgOPTIONS::FG_OPTIONS_OK )
834 // Something must have gone horribly wrong with the command
835 // line parsing or maybe the user just requested help ... :-)
836 current_options.usage();
837 fgPrintf( FG_GENERAL, FG_EXIT, "\nExiting ...\n");
840 // Initialize the Window/Graphics environment.
841 if( !fgGlutInit(&argc, argv) ) {
842 fgPrintf( FG_GENERAL, FG_EXIT, "GLUT initialization failed ...\n" );
845 // Initialize the various GLUT Event Handlers.
846 if( !fgGlutInitEvents() ) {
847 fgPrintf( FG_GENERAL, FG_EXIT,
848 "GLUT event handler initialization failed ...\n" );
851 // First do some quick general initializations
852 if( !fgInitGeneral()) {
853 fgPrintf( FG_GENERAL, FG_EXIT,
854 "General initializations failed ...\n" );
857 // Init the user interface (we need to do this before passing off
861 // pass control off to the master GLUT event handler
864 // we never actually get here ... but just in case ... :-)
870 // Revision 1.47 1998/08/27 17:02:04 curt
871 // Contributions from Bernie Bright <bbright@c031.aone.net.au>
872 // - use strings for fg_root and airport_id and added methods to return
874 // - inlined all access methods,
875 // - made the parsing functions private methods,
876 // - deleted some unused functions.
877 // - propogated some of these changes out a bit further.
879 // Revision 1.46 1998/08/22 14:49:56 curt
880 // Attempting to iron out seg faults and crashes.
881 // Did some shuffling to fix a initialization order problem between view
882 // position, scenery elevation.
884 // Revision 1.45 1998/08/20 20:32:31 curt
885 // Reshuffled some of the code in and around views.[ch]xx
887 // Revision 1.44 1998/08/20 15:10:33 curt
888 // Added GameGLUT support.
890 // Revision 1.43 1998/08/12 21:01:47 curt
891 // Master volume from 30% -> 80%
893 // Revision 1.42 1998/07/30 23:48:25 curt
894 // Output position & orientation when pausing.
895 // Eliminated libtool use.
896 // Added options to specify initial position and orientation.
897 // Changed default fov to 55 degrees.
898 // Added command line option to start in paused or unpaused state.
900 // Revision 1.41 1998/07/27 18:41:24 curt
901 // Added a pause command "p"
902 // Fixed some initialization order problems between pui and glut.
903 // Added an --enable/disable-sound option.
905 // Revision 1.40 1998/07/24 21:56:59 curt
906 // Set near clip plane to 0.5 meters when close to the ground. Also, let the view get a bit closer to the ground before hitting the hard limit.
908 // Revision 1.39 1998/07/24 21:39:08 curt
909 // Debugging output tweaks.
910 // Cast glGetString to (char *) to avoid compiler errors.
911 // Optimizations to fgGluLookAt() by Norman Vine.
913 // Revision 1.38 1998/07/22 21:40:43 curt
914 // Clear to adjusted fog color (for sunrise/sunset effects)
915 // Make call to fog sunrise/sunset adjustment method.
916 // Add a stdc++ library bug work around to fg_init.cxx
918 // Revision 1.37 1998/07/20 12:49:44 curt
919 // Tweaked color buffer clearing defaults. We clear the color buffer if we
920 // are doing textures. Assumptions: If we are doing textures we have hardware
921 // support that can clear the color buffer for "free." If we are doing software
922 // rendering with textures, then the extra clear time gets lost in the noise.
924 // Revision 1.36 1998/07/16 17:33:35 curt
925 // "H" / "h" now control hud brightness as well with off being one of the
927 // Better checking for xmesa/fx 3dfx fullscreen/window support for deciding
928 // whether or not to build in the feature.
929 // Translucent menu support.
930 // HAVE_AUDIO_SUPPORT -> ENABLE_AUDIO_SUPPORT
931 // Use fork() / wait() for playing mp3 init music in background under unix.
932 // Changed default tile diameter to 5.
934 // Revision 1.35 1998/07/13 21:01:36 curt
935 // Wrote access functions for current fgOPTIONS.
937 // Revision 1.34 1998/07/13 15:32:37 curt
938 // Clear color buffer if drawing wireframe.
939 // When specifying and airport, start elevation at -1000 and let the system
940 // position you at ground level.
942 // Revision 1.33 1998/07/12 03:14:42 curt
943 // Added ground collision detection.
944 // Did some serious horsing around to be able to "hug" the ground properly
945 // and still be able to take off.
946 // Set the near clip plane to 1.0 meters when less than 10 meters above the
948 // Did some serious horsing around getting the initial airplane position to be
949 // correct based on rendered terrain elevation.
950 // Added a little cheat/hack that will prevent the view position from ever
951 // dropping below the terrain, even when the flight model doesn't quite
952 // put you as high as you'd like.
954 // Revision 1.32 1998/07/08 14:45:07 curt
955 // polar3d.h renamed to polar3d.hxx
956 // vector.h renamed to vector.hxx
957 // updated audio support so it waits to create audio classes (and tie up
958 // /dev/dsp) until the mpg123 player is finished.
960 // Revision 1.31 1998/07/06 21:34:17 curt
961 // Added an enable/disable splash screen option.
962 // Added an enable/disable intro music option.
963 // Added an enable/disable instrument panel option.
964 // Added an enable/disable mouse pointer option.
965 // Added using namespace std for compilers that support this.
967 // Revision 1.30 1998/07/06 02:42:03 curt
968 // Added support for switching between fullscreen and window mode for
971 // Added a basic splash screen. Restructured the main loop and top level
972 // initialization routines to do this.
974 // Hacked in some support for playing a startup mp3 sound file while rest
975 // of sim initializes. Currently only works in Unix using the mpg123 player.
976 // Waits for the mpg123 player to finish before initializing internal
979 // Revision 1.29 1998/07/04 00:52:22 curt
980 // Add my own version of gluLookAt() (which is nearly identical to the
981 // Mesa/glu version.) But, by calculating the Model View matrix our selves
982 // we can save this matrix without having to read it back in from the video
983 // card. This hopefully allows us to save a few cpu cycles when rendering
984 // out the fragments because we can just use glLoadMatrixd() with the
985 // precalculated matrix for each tile rather than doing a push(), translate(),
986 // pop() for every fragment.
988 // Panel status defaults to off for now until it gets a bit more developed.
990 // Extract OpenGL driver info on initialization.
992 // Revision 1.28 1998/06/27 16:54:32 curt
993 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
994 // Don't change the view port when displaying the panel.
996 // Revision 1.27 1998/06/17 21:35:10 curt
997 // Refined conditional audio support compilation.
998 // Moved texture parameter setup calls to ../Scenery/materials.cxx
999 // #include <string.h> before various STL includes.
1000 // Make HUD default state be enabled.
1002 // Revision 1.26 1998/06/13 00:40:32 curt
1003 // Tweaked fog command line options.
1005 // Revision 1.25 1998/06/12 14:27:26 curt
1006 // Pui -> PUI, Gui -> GUI.
1008 // Revision 1.24 1998/06/12 00:57:39 curt
1009 // Added support for Pui/Gui.
1010 // Converted fog to GL_FOG_EXP2.
1011 // Link to static simulator parts.
1012 // Update runfg.bat to try to be a little smarter.
1014 // Revision 1.23 1998/06/08 17:57:04 curt
1015 // Minor sound/startup position tweaks.
1017 // Revision 1.22 1998/06/05 18:18:40 curt
1018 // A bit of fiddling with audio ...
1020 // Revision 1.21 1998/06/03 22:01:06 curt
1021 // Tweaking sound library usage.
1023 // Revision 1.20 1998/06/03 00:47:11 curt
1024 // Updated to compile in audio support if OSS available.
1025 // Updated for new version of Steve's audio library.
1026 // STL includes don't use .h
1027 // Small view optimizations.
1029 // Revision 1.19 1998/06/01 17:54:40 curt
1030 // Added Linux audio support.
1031 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
1034 // Revision 1.18 1998/05/29 20:37:19 curt
1035 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
1036 // Read airport list into a "map" STL for dynamic list sizing and fast tree
1039 // Revision 1.17 1998/05/22 21:28:52 curt
1040 // Modifications to use the new fgEVENT_MGR class.
1042 // Revision 1.16 1998/05/20 20:51:33 curt
1043 // Tweaked smooth shaded texture lighting properties.
1044 // Converted fgLIGHT to a C++ class.
1046 // Revision 1.15 1998/05/16 13:08:34 curt
1047 // C++ - ified views.[ch]xx
1048 // Shuffled some additional view parameters into the fgVIEW class.
1049 // Changed tile-radius to tile-diameter because it is a much better
1051 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
1052 // to transform world space to eye space for view frustum culling.
1054 // Revision 1.14 1998/05/13 18:29:57 curt
1055 // Added a keyboard binding to dynamically adjust field of view.
1056 // Added a command line option to specify fov.
1057 // Adjusted terrain color.
1058 // Root path info moved to fgOPTIONS.
1059 // Added ability to parse options out of a config file.
1061 // Revision 1.13 1998/05/11 18:18:15 curt
1062 // For flat shading use "glHint (GL_FOG_HINT, GL_FASTEST )"
1064 // Revision 1.12 1998/05/07 23:14:15 curt
1065 // Added "D" key binding to set autopilot heading.
1066 // Made frame rate calculation average out over last 10 frames.
1067 // Borland C++ floating point exception workaround.
1068 // Added a --tile-radius=n option.
1070 // Revision 1.11 1998/05/06 03:16:23 curt
1071 // Added an averaged global frame rate counter.
1072 // Added an option to control tile radius.
1074 // Revision 1.10 1998/05/03 00:47:31 curt
1075 // Added an option to enable/disable full-screen mode.
1077 // Revision 1.9 1998/04/30 12:34:17 curt
1078 // Added command line rendering options:
1079 // enable/disable fog/haze
1080 // specify smooth/flat shading
1081 // disable sky blending and just use a solid color
1082 // enable wireframe drawing mode
1084 // Revision 1.8 1998/04/28 01:20:21 curt
1085 // Type-ified fgTIME and fgVIEW.
1086 // Added a command line option to disable textures.
1088 // Revision 1.7 1998/04/26 05:10:02 curt
1089 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
1091 // Revision 1.6 1998/04/25 22:06:30 curt
1092 // Edited cvs log messages in source files ... bad bad bad!
1094 // Revision 1.5 1998/04/25 20:24:01 curt
1095 // Cleaned up initialization sequence to eliminate interdependencies
1096 // between sun position, lighting, and view position. This creates a
1097 // valid single pass initialization path.
1099 // Revision 1.4 1998/04/24 14:19:30 curt
1102 // Revision 1.3 1998/04/24 00:49:18 curt
1103 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
1104 // Trying out some different option parsing code.
1105 // Some code reorganization.
1107 // Revision 1.2 1998/04/22 13:25:41 curt
1108 // C++ - ifing the code.
1109 // Starting a bit of reorganization of lighting code.
1111 // Revision 1.1 1998/04/21 17:02:39 curt
1112 // Prepairing for C++ integration.
1114 // Revision 1.71 1998/04/18 04:11:26 curt
1115 // Moved fg_debug to it's own library, added zlib support.
1117 // Revision 1.70 1998/04/14 02:21:02 curt
1118 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
1119 // <jgoeke@voyager.net>
1121 // Revision 1.69 1998/04/08 23:35:34 curt
1122 // Tweaks to Gnu automake/autoconf system.
1124 // Revision 1.68 1998/04/03 22:09:03 curt
1125 // Converting to Gnu autoconf system.
1127 // Revision 1.67 1998/03/23 21:24:37 curt
1128 // Source code formating tweaks.
1130 // Revision 1.66 1998/03/14 00:31:20 curt
1131 // Beginning initial terrain texturing experiments.
1133 // Revision 1.65 1998/03/09 22:45:57 curt
1134 // Minor tweaks for building on sparc platform.
1136 // Revision 1.64 1998/02/20 00:16:23 curt
1137 // Thursday's tweaks.
1139 // Revision 1.63 1998/02/16 16:17:39 curt
1142 // Revision 1.62 1998/02/16 13:39:42 curt
1143 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
1144 // tiles to occasionally be missing.
1146 // Revision 1.61 1998/02/12 21:59:46 curt
1147 // Incorporated code changes contributed by Charlie Hotchkiss
1148 // <chotchkiss@namg.us.anritsu.com>
1150 // Revision 1.60 1998/02/11 02:50:40 curt
1153 // Revision 1.59 1998/02/09 22:56:54 curt
1154 // Removed "depend" files from cvs control. Other minor make tweaks.
1156 // Revision 1.58 1998/02/09 15:07:49 curt
1159 // Revision 1.57 1998/02/07 15:29:40 curt
1160 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
1161 // <chotchkiss@namg.us.anritsu.com>
1163 // Revision 1.56 1998/02/03 23:20:23 curt
1164 // Lots of little tweaks to fix various consistency problems discovered by
1165 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
1166 // passed arguments along to the real printf(). Also incorporated HUD changes
1167 // by Michele America.
1169 // Revision 1.55 1998/02/02 20:53:58 curt
1170 // Incorporated Durk's changes.
1172 // Revision 1.54 1998/01/31 00:43:10 curt
1173 // Added MetroWorks patches from Carmen Volpe.
1175 // Revision 1.53 1998/01/27 18:35:54 curt
1178 // Revision 1.52 1998/01/27 00:47:56 curt
1179 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
1180 // system and commandline/config file processing code.
1182 // Revision 1.51 1998/01/26 15:57:05 curt
1183 // Tweaks for dynamic scenery development.
1185 // Revision 1.50 1998/01/19 19:27:07 curt
1186 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
1187 // This should simplify things tremendously.
1189 // Revision 1.49 1998/01/19 18:40:31 curt
1190 // Tons of little changes to clean up the code and to remove fatal errors
1191 // when building with the c++ compiler.
1193 // Revision 1.48 1998/01/19 18:35:46 curt
1194 // Minor tweaks and fixes for cygwin32.
1196 // Revision 1.47 1998/01/13 00:23:08 curt
1197 // Initial changes to support loading and management of scenery tiles. Note,
1198 // there's still a fair amount of work left to be done.
1200 // Revision 1.46 1998/01/08 02:22:06 curt
1201 // Beginning to integrate Tile management subsystem.
1203 // Revision 1.45 1998/01/07 03:18:55 curt
1204 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
1206 // Revision 1.44 1997/12/30 22:22:31 curt
1207 // Further integration of event manager.
1209 // Revision 1.43 1997/12/30 20:47:43 curt
1210 // Integrated new event manager with subsystem initializations.
1212 // Revision 1.42 1997/12/30 16:36:47 curt
1213 // Merged in Durk's changes ...
1215 // Revision 1.41 1997/12/30 13:06:56 curt
1216 // A couple lighting tweaks ...
1218 // Revision 1.40 1997/12/30 01:38:37 curt
1219 // Switched back to per vertex normals and smooth shading for terrain.
1221 // Revision 1.39 1997/12/22 23:45:45 curt
1222 // First stab at sunset/sunrise sky glow effects.
1224 // Revision 1.38 1997/12/22 04:14:28 curt
1225 // Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
1227 // Revision 1.37 1997/12/19 23:34:03 curt
1228 // Lot's of tweaking with sky rendering and lighting.
1230 // Revision 1.36 1997/12/19 16:44:57 curt
1231 // Working on scene rendering order and options.
1233 // Revision 1.35 1997/12/18 23:32:32 curt
1234 // First stab at sky dome actually starting to look reasonable. :-)
1236 // Revision 1.34 1997/12/17 23:13:34 curt
1237 // Began working on rendering a sky.
1239 // Revision 1.33 1997/12/15 23:54:45 curt
1240 // Add xgl wrappers for debugging.
1241 // Generate terrain normals on the fly.
1243 // Revision 1.32 1997/12/15 20:59:08 curt
1246 // Revision 1.31 1997/12/12 21:41:25 curt
1247 // More light/material property tweaking ... still a ways off.
1249 // Revision 1.30 1997/12/12 19:52:47 curt
1250 // Working on lightling and material properties.
1252 // Revision 1.29 1997/12/11 04:43:54 curt
1253 // Fixed sun vector and lighting problems. I thing the moon is now lit
1256 // Revision 1.28 1997/12/10 22:37:45 curt
1257 // Prepended "fg" on the name of all global structures that didn't have it yet.
1258 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
1260 // Revision 1.27 1997/12/09 05:11:54 curt
1261 // Working on tweaking lighting.
1263 // Revision 1.26 1997/12/09 04:25:29 curt
1264 // Working on adding a global lighting params structure.
1266 // Revision 1.25 1997/12/08 22:54:09 curt
1267 // Enabled GL_CULL_FACE.
1269 // Revision 1.24 1997/11/25 19:25:32 curt
1270 // Changes to integrate Durk's moon/sun code updates + clean up.
1272 // Revision 1.23 1997/11/15 18:16:34 curt
1275 // Revision 1.22 1997/10/30 12:38:41 curt
1276 // Working on new scenery subsystem.
1278 // Revision 1.21 1997/09/23 00:29:38 curt
1279 // Tweaks to get things to compile with gcc-win32.
1281 // Revision 1.20 1997/09/22 14:44:19 curt
1282 // Continuing to try to align stars correctly.
1284 // Revision 1.19 1997/09/18 16:20:08 curt
1285 // At dusk/dawn add/remove stars in stages.
1287 // Revision 1.18 1997/09/16 22:14:51 curt
1288 // Tweaked time of day lighting equations. Don't draw stars during the day.
1290 // Revision 1.17 1997/09/16 15:50:29 curt
1291 // Working on star alignment and time issues.
1293 // Revision 1.16 1997/09/13 02:00:06 curt
1294 // Mostly working on stars and generating sidereal time for accurate star
1297 // Revision 1.15 1997/09/05 14:17:27 curt
1298 // More tweaking with stars.
1300 // Revision 1.14 1997/09/05 01:35:53 curt
1301 // Working on getting stars right.
1303 // Revision 1.13 1997/09/04 02:17:34 curt
1306 // Revision 1.12 1997/08/27 21:32:24 curt
1307 // Restructured view calculation code. Added stars.
1309 // Revision 1.11 1997/08/27 03:30:16 curt
1310 // Changed naming scheme of basic shared structures.
1312 // Revision 1.10 1997/08/25 20:27:22 curt
1313 // Merged in initial HUD and Joystick code.
1315 // Revision 1.9 1997/08/22 21:34:39 curt
1316 // Doing a bit of reorganizing and house cleaning.
1318 // Revision 1.8 1997/08/19 23:55:03 curt
1319 // Worked on better simulating real lighting.
1321 // Revision 1.7 1997/08/16 12:22:38 curt
1322 // Working on improving the lighting/shading.
1324 // Revision 1.6 1997/08/13 20:24:56 curt
1325 // Changes due to changing sunpos interface.
1327 // Revision 1.5 1997/08/06 21:08:32 curt
1328 // Sun position now really* works (I think) ... I still have sun time warping
1329 // code in place, probably should remove it soon.
1331 // Revision 1.4 1997/08/06 15:41:26 curt
1332 // Working on correct sun position.
1334 // Revision 1.3 1997/08/06 00:24:22 curt
1335 // Working on correct real time sun lighting.
1337 // Revision 1.2 1997/08/04 20:25:15 curt
1338 // Organizational tweaking.
1340 // Revision 1.1 1997/08/02 18:45:00 curt
1341 // Renamed GLmain.c GLUTmain.c
1343 // Revision 1.43 1997/08/02 16:23:47 curt
1346 // Revision 1.42 1997/08/01 19:43:33 curt
1347 // Making progress with coordinate system overhaul.
1349 // Revision 1.41 1997/07/31 22:52:37 curt
1350 // Working on redoing internal coordinate systems & scenery transformations.
1352 // Revision 1.40 1997/07/30 16:12:42 curt
1353 // Moved fg_random routines from Util/ to Math/
1355 // Revision 1.39 1997/07/21 14:45:01 curt
1358 // Revision 1.38 1997/07/19 23:04:47 curt
1359 // Added an initial weather section.
1361 // Revision 1.37 1997/07/19 22:34:02 curt
1362 // Moved PI definitions to ../constants.h
1363 // Moved random() stuff to ../Utils/ and renamed fg_random()
1365 // Revision 1.36 1997/07/18 23:41:25 curt
1366 // Tweaks for building with Cygnus Win32 compiler.
1368 // Revision 1.35 1997/07/18 14:28:34 curt
1369 // Hacked in some support for wind/turbulence.
1371 // Revision 1.34 1997/07/16 20:04:48 curt
1372 // Minor tweaks to aid Win32 port.
1374 // Revision 1.33 1997/07/12 03:50:20 curt
1375 // Added an #include <Windows32/Base.h> to help compiling for Win32
1377 // Revision 1.32 1997/07/11 03:23:18 curt
1378 // Solved some scenery display/orientation problems. Still have a positioning
1379 // (or transformation?) problem.
1381 // Revision 1.31 1997/07/11 01:29:58 curt
1382 // More tweaking of terrian floor.
1384 // Revision 1.30 1997/07/10 04:26:37 curt
1385 // We now can interpolated ground elevation for any position in the grid. We
1386 // can use this to enforce a "hard" ground. We still need to enforce some
1387 // bounds checking so that we don't try to lookup data points outside the
1390 // Revision 1.29 1997/07/09 21:31:12 curt
1391 // Working on making the ground "hard."
1393 // Revision 1.28 1997/07/08 18:20:12 curt
1394 // Working on establishing a hard ground.
1396 // Revision 1.27 1997/07/07 20:59:49 curt
1397 // Working on scenery transformations to enable us to fly fluidly over the
1398 // poles with no discontinuity/distortion in scenery.
1400 // Revision 1.26 1997/07/05 20:43:34 curt
1401 // renamed mat3 directory to Math so we could add other math related routines.
1403 // Revision 1.25 1997/06/29 21:19:17 curt
1404 // Working on scenery management system.
1406 // Revision 1.24 1997/06/26 22:14:53 curt
1407 // Beginning work on a scenery management system.
1409 // Revision 1.23 1997/06/26 19:08:33 curt
1410 // Restructuring make, adding automatic "make dep" support.
1412 // Revision 1.22 1997/06/25 15:39:47 curt
1413 // Minor changes to compile with rsxnt/win32.
1415 // Revision 1.21 1997/06/22 21:44:41 curt
1416 // Working on intergrating the VRML (subset) parser.
1418 // Revision 1.20 1997/06/21 17:12:53 curt
1419 // Capitalized subdirectory names.
1421 // Revision 1.19 1997/06/18 04:10:31 curt
1422 // A couple more runway tweaks ...
1424 // Revision 1.18 1997/06/18 02:21:24 curt
1425 // Hacked in a runway
1427 // Revision 1.17 1997/06/17 16:51:58 curt
1428 // Timer interval stuff now uses gettimeofday() instead of ftime()
1430 // Revision 1.16 1997/06/17 04:19:16 curt
1431 // More timer related tweaks with respect to view direction changes.
1433 // Revision 1.15 1997/06/17 03:41:10 curt
1434 // Nonsignal based interval timing is now working.
1435 // This would be a good time to look at cleaning up the code structure a bit.
1437 // Revision 1.14 1997/06/16 19:32:51 curt
1438 // Starting to add general timer support.
1440 // Revision 1.13 1997/06/02 03:40:06 curt
1441 // A tiny bit more view tweaking.
1443 // Revision 1.12 1997/06/02 03:01:38 curt
1444 // Working on views (side, front, back, transitions, etc.)
1446 // Revision 1.11 1997/05/31 19:16:25 curt
1447 // Elevator trim added.
1449 // Revision 1.10 1997/05/31 04:13:52 curt
1450 // WE CAN NOW FLY!!!
1452 // Continuing work on the LaRCsim flight model integration.
1453 // Added some MSFS-like keyboard input handling.
1455 // Revision 1.9 1997/05/30 19:27:01 curt
1456 // The LaRCsim flight model is starting to look like it is working.
1458 // Revision 1.8 1997/05/30 03:54:10 curt
1459 // Made a bit more progress towards integrating the LaRCsim flight model.
1461 // Revision 1.7 1997/05/29 22:39:49 curt
1462 // Working on incorporating the LaRCsim flight model.
1464 // Revision 1.6 1997/05/29 12:31:39 curt
1465 // Minor tweaks, moving towards general flight model integration.
1467 // Revision 1.5 1997/05/29 02:33:23 curt
1468 // Updated to reflect changing interfaces in other "modules."
1470 // Revision 1.4 1997/05/27 17:44:31 curt
1471 // Renamed & rearranged variables and routines. Added some initial simple
1472 // timer/alarm routines so the flight model can be updated on a regular
1475 // Revision 1.3 1997/05/23 15:40:25 curt
1476 // Added GNU copyright headers.
1479 // Revision 1.2 1997/05/23 00:35:12 curt
1480 // Trying to get fog to work ...
1482 // Revision 1.1 1997/05/21 15:57:51 curt
1483 // Renamed due to added GLUT support.
1485 // Revision 1.3 1997/05/19 18:22:42 curt
1486 // Parameter tweaking ... starting to stub in fog support.
1488 // Revision 1.2 1997/05/17 00:17:34 curt
1489 // Trying to stub in support for standard OpenGL.
1491 // Revision 1.1 1997/05/16 16:05:52 curt
1492 // Initial revision.