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)
45 #include <sys/stat.h> /* for stat() */
48 # include <unistd.h> /* for stat() */
51 #include <Include/fg_constants.h> // for VERSION
52 #include <Include/general.h>
54 #include <Aircraft/aircraft.h>
55 #include <Astro/moon.hxx>
56 #include <Astro/planets.hxx>
57 #include <Astro/sky.hxx>
58 #include <Astro/stars.hxx>
59 #include <Astro/sun.hxx>
61 #ifdef ENABLE_AUDIO_SUPPORT
62 # include <Audio/src/sl.h>
63 # include <Audio/src/sm.h>
66 #include <Cockpit/cockpit.hxx>
67 #include <Debug/fg_debug.h>
69 #include <Joystick/joystick.h>
70 #include <Math/fg_geodesy.h>
71 #include <Math/mat3.h>
72 #include <Math/polar3d.hxx>
74 #include <Scenery/scenery.hxx>
75 #include <Scenery/tilemgr.hxx>
76 #include <Time/event.hxx>
77 #include <Time/fg_time.hxx>
78 #include <Time/fg_timer.hxx>
79 #include <Time/sunpos.hxx>
80 #include <Weather/weather.h>
82 #include "GLUTkey.hxx"
83 #include "fg_init.hxx"
84 #include "options.hxx"
89 // This is a record containing global housekeeping information
92 // Specify our current idle function state. This is used to run all
93 // our initializations out of the glutIdleLoop() so that we can get a
94 // splash screen up and running right away.
95 static idle_state = 0;
100 // Global structures for the Audio library
101 #ifdef ENABLE_AUDIO_SUPPORT
102 slScheduler *audio_sched;
103 smMixer *audio_mixer;
109 // The following defines flight gear options. Because glutlib will also
110 // want to parse its own options, those options must not be included here
111 // or they will get parsed by the main program option parser. Hence case
112 // is significant for any option added that might be in conflict with
115 // glutlib parses for:
117 // -direct (invalid in Win32)
121 // -indirect (invalid in Win32)
124 // Note that glutlib depends upon strings while this program's
125 // option parser wants only initial characters followed by numbers
130 // fgInitVisuals() -- Initialize various GL/view parameters
131 static void fgInitVisuals( void ) {
135 l = &cur_light_params;
136 w = ¤t_weather;
138 // Go full screen if requested ...
139 if ( current_options.get_fullscreen() ) {
143 // If enabled, normal vectors specified with glNormal are scaled
144 // to unit length after transformation. See glNormal.
145 // xglEnable( GL_NORMALIZE );
147 xglEnable( GL_LIGHTING );
148 xglEnable( GL_LIGHT0 );
149 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
151 // xglFogi (GL_FOG_MODE, GL_LINEAR);
152 xglFogi (GL_FOG_MODE, GL_EXP2);
153 // Fog density is now set when the weather system is initialized
154 // xglFogf (GL_FOG_DENSITY, w->fog_density);
155 if ( (current_options.get_fog() == 1) ||
156 (current_options.get_shading() == 0) ) {
157 // if fastest fog requested, or if flat shading force fastest
158 xglHint ( GL_FOG_HINT, GL_FASTEST );
159 } else if ( current_options.get_fog() == 2 ) {
160 xglHint ( GL_FOG_HINT, GL_NICEST );
162 if ( current_options.get_wireframe() ) {
164 xglPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
167 // This is the default anyways, but it can't hurt
168 xglFrontFace ( GL_CCW );
171 // xglEnable(GL_POINT_SMOOTH);
172 // xglEnable(GL_LINE_SMOOTH);
173 // xglEnable(GL_POLYGON_SMOOTH);
177 // Update the view volume, position, and orientation
178 static void fgUpdateViewParams( void ) {
183 f = current_aircraft.flight;
184 l = &cur_light_params;
188 v->UpdateWorldToEye(f);
190 // if (!o->panel_status) {
191 // xglViewport( 0, (GLint)((v->winHeight) / 2 ) ,
192 // (GLint)(v->winWidth), (GLint)(v->winHeight) / 2 );
193 // Tell GL we are about to modify the projection parameters
194 // xglMatrixMode(GL_PROJECTION);
195 // xglLoadIdentity();
196 // gluPerspective(o->fov, v->win_ratio / 2.0, 1.0, 100000.0);
198 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) );
199 // Tell GL we are about to modify the projection parameters
200 xglMatrixMode(GL_PROJECTION);
202 if ( FG_Altitude * FEET_TO_METER - scenery.cur_elev > 10.0 ) {
203 gluPerspective(current_options.get_fov(), v->win_ratio, 10.0, 100000.0);
205 gluPerspective(current_options.get_fov(), v->win_ratio, 0.5, 100000.0);
206 // printf("Near ground, minimizing near clip plane\n");
210 xglMatrixMode(GL_MODELVIEW);
213 // set up our view volume (default)
214 fg_gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
215 v->view_pos.x + v->view_forward[0],
216 v->view_pos.y + v->view_forward[1],
217 v->view_pos.z + v->view_forward[2],
218 v->view_up[0], v->view_up[1], v->view_up[2]);
220 // look almost straight up (testing and eclipse watching)
221 /* fg_gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
222 v->view_pos.x + v->view_up[0] + .001,
223 v->view_pos.y + v->view_up[1] + .001,
224 v->view_pos.z + v->view_up[2] + .001,
225 v->view_up[0], v->view_up[1], v->view_up[2]); */
227 // lock view horizontally towards sun (testing)
228 /* fg_gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
229 v->view_pos.x + v->surface_to_sun[0],
230 v->view_pos.y + v->surface_to_sun[1],
231 v->view_pos.z + v->surface_to_sun[2],
232 v->view_up[0], v->view_up[1], v->view_up[2]); */
234 // lock view horizontally towards south (testing)
235 /* fg_gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
236 v->view_pos.x + v->surface_south[0],
237 v->view_pos.y + v->surface_south[1],
238 v->view_pos.z + v->surface_south[2],
239 v->view_up[0], v->view_up[1], v->view_up[2]); */
241 // set the sun position
242 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
246 #ifdef IS_THIS_BETTER_THAN_A_ZERO_CHARLIE
247 // Draw a basic instrument panel
248 static void fgUpdateInstrViewParams( void ) {
256 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) / 2);
258 xglMatrixMode(GL_PROJECTION);
262 gluOrtho2D(0, 640, 0, 480);
263 xglMatrixMode(GL_MODELVIEW);
267 xglColor3f(1.0, 1.0, 1.0);
270 xglDisable(GL_DEPTH_TEST);
271 xglDisable(GL_LIGHTING);
274 xglColor3f (0.5, 0.5, 0.5);
277 xglVertex2f(0.0, 0.00);
278 xglVertex2f(0.0, 480.0);
279 xglVertex2f(640.0,480.0);
280 xglVertex2f(640.0, 0.0);
283 xglRectf(0.0,0.0, 640, 480);
284 xglEnable(GL_DEPTH_TEST);
285 xglEnable(GL_LIGHTING);
286 xglMatrixMode(GL_PROJECTION);
288 xglMatrixMode(GL_MODELVIEW);
294 // Update all Visuals (redraws anything graphics related)
295 static void fgRenderFrame( void ) {
301 // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
302 GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
303 GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
304 GLbitfield clear_mask;
306 f = current_aircraft.flight;
307 l = &cur_light_params;
308 t = &cur_time_params;
311 if ( idle_state != 1000 ) {
312 // still initializing, draw the splash screen
313 if ( current_options.get_splash_screen() == 1 ) {
317 // idle_state is now 1000 meaning we've finished all our
318 // initializations and are running the main loop, so this will
319 // now work without seg faulting the system.
321 // printf("Ground = %.2f Altitude = %.2f\n", scenery.cur_elev,
322 // FG_Altitude * FEET_TO_METER);
324 // this is just a temporary hack, to make me understand Pui
325 timerText -> setLabel (ctime (&t->cur_time));
328 // update view volume parameters
329 fgUpdateViewParams();
331 clear_mask = GL_DEPTH_BUFFER_BIT;
332 if ( current_options.get_wireframe() ) {
333 clear_mask |= GL_COLOR_BUFFER_BIT;
335 if ( current_options.get_skyblend() ) {
336 if ( current_options.get_textures() ) {
337 // glClearColor(black[0], black[1], black[2], black[3]);
338 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
339 l->adj_fog_color[2], l->adj_fog_color[3]);
340 clear_mask |= GL_COLOR_BUFFER_BIT;
343 glClearColor(l->sky_color[0], l->sky_color[1],
344 l->sky_color[2], l->sky_color[3]);
345 clear_mask |= GL_COLOR_BUFFER_BIT;
347 xglClear( clear_mask );
349 // Tell GL we are switching to model view parameters
350 xglMatrixMode(GL_MODELVIEW);
351 // xglLoadIdentity();
354 xglDisable( GL_DEPTH_TEST );
355 xglDisable( GL_LIGHTING );
356 xglDisable( GL_CULL_FACE );
357 xglDisable( GL_FOG );
358 xglShadeModel( GL_SMOOTH );
359 if ( current_options.get_skyblend() ) {
363 // setup transformation for drawing astronomical objects
365 // Translate to view position
366 xglTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
367 // Rotate based on gst (sidereal time)
368 // note: constant should be 15.041085, Curt thought it was 15
369 angle = t->gst * 15.041085;
370 // printf("Rotating astro objects by %.2f degrees\n",angle);
371 xglRotatef( angle, 0.0, 0.0, -1.0 );
373 // draw stars and planets
381 xglEnable( GL_LIGHTING );
382 // set lighting parameters
383 xglLightfv(GL_LIGHT0, GL_AMBIENT, white );
384 xglLightfv(GL_LIGHT0, GL_DIFFUSE, white );
385 xglEnable( GL_CULL_FACE );
387 // Let's try some blending technique's (Durk)
389 glBlendFunc(GL_ONE, GL_ONE);
396 if ( current_options.get_shading() ) {
397 xglShadeModel( GL_SMOOTH );
399 xglShadeModel( GL_FLAT );
401 xglEnable( GL_DEPTH_TEST );
402 if ( current_options.get_fog() > 0 ) {
404 xglFogfv (GL_FOG_COLOR, l->adj_fog_color);
406 // set lighting parameters
407 xglLightfv(GL_LIGHT0, GL_AMBIENT, l->scene_ambient );
408 xglLightfv(GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
410 if ( current_options.get_textures() ) {
411 // texture parameters
412 xglEnable( GL_TEXTURE_2D );
413 xglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
414 xglHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
415 // set base color (I don't think this is doing anything here)
416 xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
417 xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
419 xglDisable( GL_TEXTURE_2D );
420 xglMaterialfv (GL_FRONT, GL_AMBIENT, terrain_color);
421 xglMaterialfv (GL_FRONT, GL_DIFFUSE, terrain_color);
422 // xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
423 // xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
428 xglDisable( GL_TEXTURE_2D );
430 // display HUD && Panel
433 // display instruments
434 // if (!o->panel_status) {
435 // fgUpdateInstrViewParams();
438 // We can do translucent menus, so why not. :-)
439 xglEnable ( GL_BLEND ) ;
440 xglBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
442 xglDisable ( GL_BLEND ) ;
449 // Update internal time dependent calculations (i.e. flight model)
450 void fgUpdateTimeDepCalcs(int multi_loop) {
457 f = current_aircraft.flight;
458 l = &cur_light_params;
459 t = &cur_time_params;
462 // update the flight model
463 if ( multi_loop < 0 ) {
464 multi_loop = DEFAULT_MULTILOOP;
468 // printf("updating flight model x %d\n", multi_loop);
469 fgFlightModelUpdate(FG_LARCSIM, f, multi_loop);
471 fgFlightModelUpdate(FG_LARCSIM, f, 0);
474 // update the view angle
475 for ( i = 0; i < multi_loop; i++ ) {
476 if ( fabs(v->goal_view_offset - v->view_offset) < 0.05 ) {
477 v->view_offset = v->goal_view_offset;
480 // move v->view_offset towards v->goal_view_offset
481 if ( v->goal_view_offset > v->view_offset ) {
482 if ( v->goal_view_offset - v->view_offset < FG_PI ) {
483 v->view_offset += 0.01;
485 v->view_offset -= 0.01;
488 if ( v->view_offset - v->goal_view_offset < FG_PI ) {
489 v->view_offset -= 0.01;
491 v->view_offset += 0.01;
494 if ( v->view_offset > FG_2PI ) {
495 v->view_offset -= FG_2PI;
496 } else if ( v->view_offset < 0 ) {
497 v->view_offset += FG_2PI;
502 double tmp = -(l->sun_rotation + FG_PI) - (FG_Psi - v->view_offset);
503 while ( tmp < 0.0 ) {
506 while ( tmp > FG_2PI ) {
509 /* printf("Psi = %.2f, viewoffset = %.2f sunrot = %.2f rottosun = %.2f\n",
510 FG_Psi * RAD_TO_DEG, v->view_offset * RAD_TO_DEG,
511 -(l->sun_rotation+FG_PI) * RAD_TO_DEG, tmp * RAD_TO_DEG); */
516 void fgInitTimeDepCalcs( void ) {
519 #ifdef HAVE_SETITIMER
520 fgTimerInit( 1.0 / DEFAULT_TIMER_HZ, fgUpdateTimeDepCalcs );
521 #endif HAVE_SETITIMER
526 // What should we do when we have nothing else to do? Let's get ready
527 // for the next move and update the display?
528 static void fgMainLoop( void ) {
532 static int remainder = 0;
533 int elapsed, multi_loop;
536 // double joy_x, joy_y;
537 // int joy_b1, joy_b2;
539 f = current_aircraft.flight;
541 t = &cur_time_params;
543 fgPrintf( FG_ALL, FG_DEBUG, "Running Main Loop\n");
544 fgPrintf( FG_ALL, FG_DEBUG, "======= ==== ====\n");
546 // Fix elevation. I'm just sticking this here for now, it should
547 // probably move eventually
549 /* printf("Before - ground = %.2f runway = %.2f alt = %.2f\n",
551 FG_Runway_altitude * FEET_TO_METER,
552 FG_Altitude * FEET_TO_METER); */
554 if ( scenery.cur_elev > -9990 ) {
555 if ( FG_Altitude * FEET_TO_METER <
556 (scenery.cur_elev + 3.758099 * FEET_TO_METER - 3.0) ) {
557 // now set aircraft altitude above ground
558 printf("Current Altitude = %.2f < %.2f forcing to %.2f\n",
559 FG_Altitude * FEET_TO_METER,
560 scenery.cur_elev + 3.758099 * FEET_TO_METER - 3.0,
561 scenery.cur_elev + 3.758099 * FEET_TO_METER);
562 fgFlightModelSetAltitude( FG_LARCSIM, f,
564 3.758099 * FEET_TO_METER);
566 fgPrintf( FG_ALL, FG_BULK,
567 "<*> resetting altitude to %.0f meters\n",
568 FG_Altitude * FEET_TO_METER);
570 FG_Runway_altitude = scenery.cur_elev * METER_TO_FEET;
573 /* printf("Adjustment - ground = %.2f runway = %.2f alt = %.2f\n",
575 FG_Runway_altitude * FEET_TO_METER,
576 FG_Altitude * FEET_TO_METER); */
582 /* fgJoystickRead( &joy_x, &joy_y, &joy_b1, &joy_b2 );
583 printf( "Joystick X %f Y %f B1 %d B2 %d\n",
584 joy_x, joy_y, joy_b1, joy_b2 );
586 fgAileronSet( joy_x ); */
588 // Get elapsed time for this past frame
589 elapsed = fgGetTimeInterval();
590 fgPrintf( FG_ALL, FG_BULK,
591 "Time interval is = %d, previous remainder is = %d\n",
594 // Calculate frame rate average
595 if ( elapsed > 0.0 ) {
597 for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
598 accum += g->frames[i];
599 // printf("frame[%d] = %.2f\n", i, g->frames[i]);
600 g->frames[i+1] = g->frames[i];
602 g->frames[0] = 1000.0 / (float)elapsed;
603 // printf("frame[0] = %.2f\n", g->frames[0]);
604 accum += g->frames[0];
605 g->frame_rate = accum / (float)FG_FRAME_RATE_HISTORY;
606 // printf("ave = %.2f\n", g->frame_rate);
609 // Calculate model iterations needed for next frame
610 fgPrintf( FG_ALL, FG_DEBUG,
611 "--> Frame rate is = %.2f\n", g->frame_rate);
612 elapsed += remainder;
614 multi_loop = (int)(((float)elapsed * 0.001) * DEFAULT_MODEL_HZ);
615 remainder = elapsed - ((multi_loop*1000) / DEFAULT_MODEL_HZ);
616 fgPrintf( FG_ALL, FG_BULK,
617 "Model iterations needed = %d, new remainder = %d\n",
618 multi_loop, remainder);
620 /* printf("right before fm - ground = %.2f runway = %.2f alt = %.2f\n",
622 FG_Runway_altitude * FEET_TO_METER,
623 FG_Altitude * FEET_TO_METER); */
626 if ( ! use_signals ) {
628 fgUpdateTimeDepCalcs(multi_loop);
631 /* printf("After fm - ground = %.2f runway = %.2f alt = %.2f\n",
633 FG_Runway_altitude * FEET_TO_METER,
634 FG_Altitude * FEET_TO_METER); */
636 // fgAircraftOutputCurrent(a);
638 // see if we need to load any new scenery tiles
641 // Process/manage pending events
642 global_events.Process();
644 // Run audio scheduler
645 #ifdef ENABLE_AUDIO_SUPPORT
646 if ( current_options.get_sound() ) {
647 audio_sched -> update();
654 fgPrintf( FG_ALL, FG_DEBUG, "\n");
658 // This is the top level master main function that is registered as
662 // The first few passes take care of initialization things (a couple
663 // per pass) and once everything has been initialized fgMainLoop from
666 static void fgIdleFunction ( void ) {
668 char path[256], mp3file[256], command[256], slfile[256];
669 static char *lockfile = "/tmp/mpg123.running";
673 // printf("idle state == %d\n", idle_state);
675 if ( idle_state == 0 ) {
676 // Initialize the splash screen right away
677 if ( current_options.get_splash_screen() ) {
682 } else if ( idle_state == 1 ) {
683 // Start the intro music
685 if ( current_options.get_intro_music() ) {
686 current_options.get_fg_root(mp3file);
687 strcat(mp3file, "/Sounds/");
688 strcat(mp3file, "intro.mp3");
691 "(touch %s; mpg123 %s > /dev/null 2>&1; /bin/rm %s) &",
692 lockfile, mp3file, lockfile );
693 fgPrintf( FG_GENERAL, FG_INFO,
694 "Starting intro music: %s\n", mp3file);
700 } else if ( idle_state == 2 ) {
701 // These are a few miscellaneous things that aren't really
702 // "subsystems" but still need to be initialized.
705 if ( strstr ( g->glRenderer, "Glide" ) ) {
706 grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
711 } else if ( idle_state == 3 ) {
712 // This is the top level init routine which calls all the
713 // other subsystem initialization routines. If you are adding
714 // a subsystem to flight gear, its initialization call should
715 // located in this routine.
716 if( !fgInitSubsystems()) {
717 fgPrintf( FG_GENERAL, FG_EXIT,
718 "Subsystem initializations failed ...\n" );
722 } else if ( idle_state == 4 ) {
723 // setup OpenGL view parameters
727 // init timer routines, signals, etc. Arrange for an alarm
728 // signal to be generated, etc.
729 fgInitTimeDepCalcs();
733 } else if ( idle_state == 5 ) {
736 } else if ( idle_state == 6 ) {
737 // Initialize audio support
738 #ifdef ENABLE_AUDIO_SUPPORT
741 if ( current_options.get_intro_music() ) {
742 // Let's wait for mpg123 to finish
743 struct stat stat_buf;
745 fgPrintf( FG_GENERAL, FG_INFO,
746 "Waiting for mpg123 player to finish ...\n" );
747 while ( stat(lockfile, &stat_buf) == 0 ) {
748 // file exist, wait ...
750 fgPrintf( FG_GENERAL, FG_INFO, ".");
752 fgPrintf( FG_GENERAL, FG_INFO, "\n");
756 audio_sched = new slScheduler ( 8000 );
757 audio_mixer = new smMixer;
758 audio_mixer -> setMasterVolume ( 30 ) ; /* 50% of max volume. */
759 audio_sched -> setSafetyMargin ( 1.0 ) ;
760 current_options.get_fg_root(path);
761 strcat(path, "/Sounds/");
762 strcpy(slfile, path);
763 strcat(slfile, "wasp.wav");
765 s1 = new slSample ( slfile );
766 printf("Rate = %d Bps = %d Stereo = %d\n",
767 s1 -> getRate(), s1 -> getBps(), s1 -> getStereo());
768 audio_sched -> loopSample ( s1 );
770 // strcpy(slfile, path);
771 // strcat(slfile, "thunder.wav");
772 // s2 -> loadFile ( slfile );
773 // s2 -> adjustVolume(0.5);
774 // audio_sched -> playSample ( s2 );
781 if ( idle_state == 1000 ) {
782 // We've finished all our initialization steps, from now on we
783 // run the main loop.
787 if ( current_options.get_splash_screen() == 1 ) {
794 // Handle new window size or exposure
795 static void fgReshape( int width, int height ) {
800 // Do this so we can call fgReshape(0,0) ourselves without having
801 // to know what the values of width & height are.
802 if ( (height > 0) && (width > 0) ) {
803 v->win_ratio = (GLfloat) width / (GLfloat) height;
807 v->winHeight = height;
809 // Inform gl of our view window size (now handled elsewhere)
810 // xglViewport(0, 0, (GLint)width, (GLint)height);
811 if ( idle_state == 1000 ) {
812 // yes we've finished all our initializations and are running
813 // the main loop, so this will now work without seg faulting
815 fgUpdateViewParams();
818 // xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
822 // Initialize GLUT and define a main window
823 int fgGlutInit( int *argc, char **argv ) {
824 // GLUT will extract all glut specific options so later on we only
825 // need wory about our own.
826 xglutInit(argc, argv);
828 // Define Display Parameters
829 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
831 // Define initial window size
832 xglutInitWindowSize(640, 480);
834 // Initialize windows
835 xglutCreateWindow("Flight Gear");
841 // Initialize GLUT event handlers
842 int fgGlutInitEvents( void ) {
843 // call fgReshape() on window resizes
844 xglutReshapeFunc( fgReshape );
846 // call GLUTkey() on keyboard event
847 xglutKeyboardFunc( GLUTkey );
848 glutSpecialFunc( GLUTspecialkey );
850 // call guiMouseFunc() whenever our little rodent is used
851 glutMouseFunc ( guiMouseFunc );
852 glutMotionFunc (guiMotionFunc );
853 glutPassiveMotionFunc (guiMotionFunc );
855 // call fgMainLoop() whenever there is
856 // nothing else to do
857 xglutIdleFunc( fgIdleFunction );
860 xglutDisplayFunc( fgRenderFrame );
867 int main( int argc, char **argv ) {
870 int result; // Used in command line argument.
872 f = current_aircraft.flight;
875 _control87(MCW_EM, MCW_EM); /* defined in float.h */
878 // Initialize the debugging output system
881 fgPrintf(FG_GENERAL, FG_INFO, "Flight Gear: Version %s\n\n", VERSION);
883 // Initialize the Window/Graphics environment.
884 if( !fgGlutInit(&argc, argv) ) {
885 fgPrintf( FG_GENERAL, FG_EXIT, "GLUT initialization failed ...\n" );
888 // Initialize the various GLUT Event Handlers.
889 if( !fgGlutInitEvents() ) {
890 fgPrintf( FG_GENERAL, FG_EXIT,
891 "GLUT event handler initialization failed ...\n" );
894 // Attempt to locate and parse a config file
895 // First check fg_root
896 current_options.get_fg_root(config);
897 strcat(config, "/system.fgfsrc");
898 result = current_options.parse_config_file(config);
900 // Next check home directory
901 if ( getenv("HOME") != NULL ) {
902 strcpy(config, getenv("HOME"));
903 strcat(config, "/.fgfsrc");
904 result = current_options.parse_config_file(config);
907 // Parse remaining command line options
908 // These will override anything specified in a config file
909 result = current_options.parse_command_line(argc, argv);
910 if ( result != FG_OPTIONS_OK ) {
911 // Something must have gone horribly wrong with the command
912 // line parsing or maybe the user just requested help ... :-)
913 current_options.usage();
914 fgPrintf( FG_GENERAL, FG_EXIT, "\nExiting ...\n");
917 // First do some quick general initializations
918 if( !fgInitGeneral()) {
919 fgPrintf( FG_GENERAL, FG_EXIT,
920 "General initializations failed ...\n" );
923 // Init the user interface (we need to do this before passing off
927 // pass control off to the master GLUT event handler
930 // we never actually get here ... but just in case ... :-)
936 // Revision 1.41 1998/07/27 18:41:24 curt
937 // Added a pause command "p"
938 // Fixed some initialization order problems between pui and glut.
939 // Added an --enable/disable-sound option.
941 // Revision 1.40 1998/07/24 21:56:59 curt
942 // 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.
944 // Revision 1.39 1998/07/24 21:39:08 curt
945 // Debugging output tweaks.
946 // Cast glGetString to (char *) to avoid compiler errors.
947 // Optimizations to fgGluLookAt() by Norman Vine.
949 // Revision 1.38 1998/07/22 21:40:43 curt
950 // Clear to adjusted fog color (for sunrise/sunset effects)
951 // Make call to fog sunrise/sunset adjustment method.
952 // Add a stdc++ library bug work around to fg_init.cxx
954 // Revision 1.37 1998/07/20 12:49:44 curt
955 // Tweaked color buffer clearing defaults. We clear the color buffer if we
956 // are doing textures. Assumptions: If we are doing textures we have hardware
957 // support that can clear the color buffer for "free." If we are doing software
958 // rendering with textures, then the extra clear time gets lost in the noise.
960 // Revision 1.36 1998/07/16 17:33:35 curt
961 // "H" / "h" now control hud brightness as well with off being one of the
963 // Better checking for xmesa/fx 3dfx fullscreen/window support for deciding
964 // whether or not to build in the feature.
965 // Translucent menu support.
966 // HAVE_AUDIO_SUPPORT -> ENABLE_AUDIO_SUPPORT
967 // Use fork() / wait() for playing mp3 init music in background under unix.
968 // Changed default tile diameter to 5.
970 // Revision 1.35 1998/07/13 21:01:36 curt
971 // Wrote access functions for current fgOPTIONS.
973 // Revision 1.34 1998/07/13 15:32:37 curt
974 // Clear color buffer if drawing wireframe.
975 // When specifying and airport, start elevation at -1000 and let the system
976 // position you at ground level.
978 // Revision 1.33 1998/07/12 03:14:42 curt
979 // Added ground collision detection.
980 // Did some serious horsing around to be able to "hug" the ground properly
981 // and still be able to take off.
982 // Set the near clip plane to 1.0 meters when less than 10 meters above the
984 // Did some serious horsing around getting the initial airplane position to be
985 // correct based on rendered terrain elevation.
986 // Added a little cheat/hack that will prevent the view position from ever
987 // dropping below the terrain, even when the flight model doesn't quite
988 // put you as high as you'd like.
990 // Revision 1.32 1998/07/08 14:45:07 curt
991 // polar3d.h renamed to polar3d.hxx
992 // vector.h renamed to vector.hxx
993 // updated audio support so it waits to create audio classes (and tie up
994 // /dev/dsp) until the mpg123 player is finished.
996 // Revision 1.31 1998/07/06 21:34:17 curt
997 // Added an enable/disable splash screen option.
998 // Added an enable/disable intro music option.
999 // Added an enable/disable instrument panel option.
1000 // Added an enable/disable mouse pointer option.
1001 // Added using namespace std for compilers that support this.
1003 // Revision 1.30 1998/07/06 02:42:03 curt
1004 // Added support for switching between fullscreen and window mode for
1007 // Added a basic splash screen. Restructured the main loop and top level
1008 // initialization routines to do this.
1010 // Hacked in some support for playing a startup mp3 sound file while rest
1011 // of sim initializes. Currently only works in Unix using the mpg123 player.
1012 // Waits for the mpg123 player to finish before initializing internal
1015 // Revision 1.29 1998/07/04 00:52:22 curt
1016 // Add my own version of gluLookAt() (which is nearly identical to the
1017 // Mesa/glu version.) But, by calculating the Model View matrix our selves
1018 // we can save this matrix without having to read it back in from the video
1019 // card. This hopefully allows us to save a few cpu cycles when rendering
1020 // out the fragments because we can just use glLoadMatrixd() with the
1021 // precalculated matrix for each tile rather than doing a push(), translate(),
1022 // pop() for every fragment.
1024 // Panel status defaults to off for now until it gets a bit more developed.
1026 // Extract OpenGL driver info on initialization.
1028 // Revision 1.28 1998/06/27 16:54:32 curt
1029 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
1030 // Don't change the view port when displaying the panel.
1032 // Revision 1.27 1998/06/17 21:35:10 curt
1033 // Refined conditional audio support compilation.
1034 // Moved texture parameter setup calls to ../Scenery/materials.cxx
1035 // #include <string.h> before various STL includes.
1036 // Make HUD default state be enabled.
1038 // Revision 1.26 1998/06/13 00:40:32 curt
1039 // Tweaked fog command line options.
1041 // Revision 1.25 1998/06/12 14:27:26 curt
1042 // Pui -> PUI, Gui -> GUI.
1044 // Revision 1.24 1998/06/12 00:57:39 curt
1045 // Added support for Pui/Gui.
1046 // Converted fog to GL_FOG_EXP2.
1047 // Link to static simulator parts.
1048 // Update runfg.bat to try to be a little smarter.
1050 // Revision 1.23 1998/06/08 17:57:04 curt
1051 // Minor sound/startup position tweaks.
1053 // Revision 1.22 1998/06/05 18:18:40 curt
1054 // A bit of fiddling with audio ...
1056 // Revision 1.21 1998/06/03 22:01:06 curt
1057 // Tweaking sound library usage.
1059 // Revision 1.20 1998/06/03 00:47:11 curt
1060 // Updated to compile in audio support if OSS available.
1061 // Updated for new version of Steve's audio library.
1062 // STL includes don't use .h
1063 // Small view optimizations.
1065 // Revision 1.19 1998/06/01 17:54:40 curt
1066 // Added Linux audio support.
1067 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
1070 // Revision 1.18 1998/05/29 20:37:19 curt
1071 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
1072 // Read airport list into a "map" STL for dynamic list sizing and fast tree
1075 // Revision 1.17 1998/05/22 21:28:52 curt
1076 // Modifications to use the new fgEVENT_MGR class.
1078 // Revision 1.16 1998/05/20 20:51:33 curt
1079 // Tweaked smooth shaded texture lighting properties.
1080 // Converted fgLIGHT to a C++ class.
1082 // Revision 1.15 1998/05/16 13:08:34 curt
1083 // C++ - ified views.[ch]xx
1084 // Shuffled some additional view parameters into the fgVIEW class.
1085 // Changed tile-radius to tile-diameter because it is a much better
1087 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
1088 // to transform world space to eye space for view frustum culling.
1090 // Revision 1.14 1998/05/13 18:29:57 curt
1091 // Added a keyboard binding to dynamically adjust field of view.
1092 // Added a command line option to specify fov.
1093 // Adjusted terrain color.
1094 // Root path info moved to fgOPTIONS.
1095 // Added ability to parse options out of a config file.
1097 // Revision 1.13 1998/05/11 18:18:15 curt
1098 // For flat shading use "glHint (GL_FOG_HINT, GL_FASTEST )"
1100 // Revision 1.12 1998/05/07 23:14:15 curt
1101 // Added "D" key binding to set autopilot heading.
1102 // Made frame rate calculation average out over last 10 frames.
1103 // Borland C++ floating point exception workaround.
1104 // Added a --tile-radius=n option.
1106 // Revision 1.11 1998/05/06 03:16:23 curt
1107 // Added an averaged global frame rate counter.
1108 // Added an option to control tile radius.
1110 // Revision 1.10 1998/05/03 00:47:31 curt
1111 // Added an option to enable/disable full-screen mode.
1113 // Revision 1.9 1998/04/30 12:34:17 curt
1114 // Added command line rendering options:
1115 // enable/disable fog/haze
1116 // specify smooth/flat shading
1117 // disable sky blending and just use a solid color
1118 // enable wireframe drawing mode
1120 // Revision 1.8 1998/04/28 01:20:21 curt
1121 // Type-ified fgTIME and fgVIEW.
1122 // Added a command line option to disable textures.
1124 // Revision 1.7 1998/04/26 05:10:02 curt
1125 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
1127 // Revision 1.6 1998/04/25 22:06:30 curt
1128 // Edited cvs log messages in source files ... bad bad bad!
1130 // Revision 1.5 1998/04/25 20:24:01 curt
1131 // Cleaned up initialization sequence to eliminate interdependencies
1132 // between sun position, lighting, and view position. This creates a
1133 // valid single pass initialization path.
1135 // Revision 1.4 1998/04/24 14:19:30 curt
1138 // Revision 1.3 1998/04/24 00:49:18 curt
1139 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
1140 // Trying out some different option parsing code.
1141 // Some code reorganization.
1143 // Revision 1.2 1998/04/22 13:25:41 curt
1144 // C++ - ifing the code.
1145 // Starting a bit of reorganization of lighting code.
1147 // Revision 1.1 1998/04/21 17:02:39 curt
1148 // Prepairing for C++ integration.
1150 // Revision 1.71 1998/04/18 04:11:26 curt
1151 // Moved fg_debug to it's own library, added zlib support.
1153 // Revision 1.70 1998/04/14 02:21:02 curt
1154 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
1155 // <jgoeke@voyager.net>
1157 // Revision 1.69 1998/04/08 23:35:34 curt
1158 // Tweaks to Gnu automake/autoconf system.
1160 // Revision 1.68 1998/04/03 22:09:03 curt
1161 // Converting to Gnu autoconf system.
1163 // Revision 1.67 1998/03/23 21:24:37 curt
1164 // Source code formating tweaks.
1166 // Revision 1.66 1998/03/14 00:31:20 curt
1167 // Beginning initial terrain texturing experiments.
1169 // Revision 1.65 1998/03/09 22:45:57 curt
1170 // Minor tweaks for building on sparc platform.
1172 // Revision 1.64 1998/02/20 00:16:23 curt
1173 // Thursday's tweaks.
1175 // Revision 1.63 1998/02/16 16:17:39 curt
1178 // Revision 1.62 1998/02/16 13:39:42 curt
1179 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
1180 // tiles to occasionally be missing.
1182 // Revision 1.61 1998/02/12 21:59:46 curt
1183 // Incorporated code changes contributed by Charlie Hotchkiss
1184 // <chotchkiss@namg.us.anritsu.com>
1186 // Revision 1.60 1998/02/11 02:50:40 curt
1189 // Revision 1.59 1998/02/09 22:56:54 curt
1190 // Removed "depend" files from cvs control. Other minor make tweaks.
1192 // Revision 1.58 1998/02/09 15:07:49 curt
1195 // Revision 1.57 1998/02/07 15:29:40 curt
1196 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
1197 // <chotchkiss@namg.us.anritsu.com>
1199 // Revision 1.56 1998/02/03 23:20:23 curt
1200 // Lots of little tweaks to fix various consistency problems discovered by
1201 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
1202 // passed arguments along to the real printf(). Also incorporated HUD changes
1203 // by Michele America.
1205 // Revision 1.55 1998/02/02 20:53:58 curt
1206 // Incorporated Durk's changes.
1208 // Revision 1.54 1998/01/31 00:43:10 curt
1209 // Added MetroWorks patches from Carmen Volpe.
1211 // Revision 1.53 1998/01/27 18:35:54 curt
1214 // Revision 1.52 1998/01/27 00:47:56 curt
1215 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
1216 // system and commandline/config file processing code.
1218 // Revision 1.51 1998/01/26 15:57:05 curt
1219 // Tweaks for dynamic scenery development.
1221 // Revision 1.50 1998/01/19 19:27:07 curt
1222 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
1223 // This should simplify things tremendously.
1225 // Revision 1.49 1998/01/19 18:40:31 curt
1226 // Tons of little changes to clean up the code and to remove fatal errors
1227 // when building with the c++ compiler.
1229 // Revision 1.48 1998/01/19 18:35:46 curt
1230 // Minor tweaks and fixes for cygwin32.
1232 // Revision 1.47 1998/01/13 00:23:08 curt
1233 // Initial changes to support loading and management of scenery tiles. Note,
1234 // there's still a fair amount of work left to be done.
1236 // Revision 1.46 1998/01/08 02:22:06 curt
1237 // Beginning to integrate Tile management subsystem.
1239 // Revision 1.45 1998/01/07 03:18:55 curt
1240 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
1242 // Revision 1.44 1997/12/30 22:22:31 curt
1243 // Further integration of event manager.
1245 // Revision 1.43 1997/12/30 20:47:43 curt
1246 // Integrated new event manager with subsystem initializations.
1248 // Revision 1.42 1997/12/30 16:36:47 curt
1249 // Merged in Durk's changes ...
1251 // Revision 1.41 1997/12/30 13:06:56 curt
1252 // A couple lighting tweaks ...
1254 // Revision 1.40 1997/12/30 01:38:37 curt
1255 // Switched back to per vertex normals and smooth shading for terrain.
1257 // Revision 1.39 1997/12/22 23:45:45 curt
1258 // First stab at sunset/sunrise sky glow effects.
1260 // Revision 1.38 1997/12/22 04:14:28 curt
1261 // Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
1263 // Revision 1.37 1997/12/19 23:34:03 curt
1264 // Lot's of tweaking with sky rendering and lighting.
1266 // Revision 1.36 1997/12/19 16:44:57 curt
1267 // Working on scene rendering order and options.
1269 // Revision 1.35 1997/12/18 23:32:32 curt
1270 // First stab at sky dome actually starting to look reasonable. :-)
1272 // Revision 1.34 1997/12/17 23:13:34 curt
1273 // Began working on rendering a sky.
1275 // Revision 1.33 1997/12/15 23:54:45 curt
1276 // Add xgl wrappers for debugging.
1277 // Generate terrain normals on the fly.
1279 // Revision 1.32 1997/12/15 20:59:08 curt
1282 // Revision 1.31 1997/12/12 21:41:25 curt
1283 // More light/material property tweaking ... still a ways off.
1285 // Revision 1.30 1997/12/12 19:52:47 curt
1286 // Working on lightling and material properties.
1288 // Revision 1.29 1997/12/11 04:43:54 curt
1289 // Fixed sun vector and lighting problems. I thing the moon is now lit
1292 // Revision 1.28 1997/12/10 22:37:45 curt
1293 // Prepended "fg" on the name of all global structures that didn't have it yet.
1294 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
1296 // Revision 1.27 1997/12/09 05:11:54 curt
1297 // Working on tweaking lighting.
1299 // Revision 1.26 1997/12/09 04:25:29 curt
1300 // Working on adding a global lighting params structure.
1302 // Revision 1.25 1997/12/08 22:54:09 curt
1303 // Enabled GL_CULL_FACE.
1305 // Revision 1.24 1997/11/25 19:25:32 curt
1306 // Changes to integrate Durk's moon/sun code updates + clean up.
1308 // Revision 1.23 1997/11/15 18:16:34 curt
1311 // Revision 1.22 1997/10/30 12:38:41 curt
1312 // Working on new scenery subsystem.
1314 // Revision 1.21 1997/09/23 00:29:38 curt
1315 // Tweaks to get things to compile with gcc-win32.
1317 // Revision 1.20 1997/09/22 14:44:19 curt
1318 // Continuing to try to align stars correctly.
1320 // Revision 1.19 1997/09/18 16:20:08 curt
1321 // At dusk/dawn add/remove stars in stages.
1323 // Revision 1.18 1997/09/16 22:14:51 curt
1324 // Tweaked time of day lighting equations. Don't draw stars during the day.
1326 // Revision 1.17 1997/09/16 15:50:29 curt
1327 // Working on star alignment and time issues.
1329 // Revision 1.16 1997/09/13 02:00:06 curt
1330 // Mostly working on stars and generating sidereal time for accurate star
1333 // Revision 1.15 1997/09/05 14:17:27 curt
1334 // More tweaking with stars.
1336 // Revision 1.14 1997/09/05 01:35:53 curt
1337 // Working on getting stars right.
1339 // Revision 1.13 1997/09/04 02:17:34 curt
1342 // Revision 1.12 1997/08/27 21:32:24 curt
1343 // Restructured view calculation code. Added stars.
1345 // Revision 1.11 1997/08/27 03:30:16 curt
1346 // Changed naming scheme of basic shared structures.
1348 // Revision 1.10 1997/08/25 20:27:22 curt
1349 // Merged in initial HUD and Joystick code.
1351 // Revision 1.9 1997/08/22 21:34:39 curt
1352 // Doing a bit of reorganizing and house cleaning.
1354 // Revision 1.8 1997/08/19 23:55:03 curt
1355 // Worked on better simulating real lighting.
1357 // Revision 1.7 1997/08/16 12:22:38 curt
1358 // Working on improving the lighting/shading.
1360 // Revision 1.6 1997/08/13 20:24:56 curt
1361 // Changes due to changing sunpos interface.
1363 // Revision 1.5 1997/08/06 21:08:32 curt
1364 // Sun position now really* works (I think) ... I still have sun time warping
1365 // code in place, probably should remove it soon.
1367 // Revision 1.4 1997/08/06 15:41:26 curt
1368 // Working on correct sun position.
1370 // Revision 1.3 1997/08/06 00:24:22 curt
1371 // Working on correct real time sun lighting.
1373 // Revision 1.2 1997/08/04 20:25:15 curt
1374 // Organizational tweaking.
1376 // Revision 1.1 1997/08/02 18:45:00 curt
1377 // Renamed GLmain.c GLUTmain.c
1379 // Revision 1.43 1997/08/02 16:23:47 curt
1382 // Revision 1.42 1997/08/01 19:43:33 curt
1383 // Making progress with coordinate system overhaul.
1385 // Revision 1.41 1997/07/31 22:52:37 curt
1386 // Working on redoing internal coordinate systems & scenery transformations.
1388 // Revision 1.40 1997/07/30 16:12:42 curt
1389 // Moved fg_random routines from Util/ to Math/
1391 // Revision 1.39 1997/07/21 14:45:01 curt
1394 // Revision 1.38 1997/07/19 23:04:47 curt
1395 // Added an initial weather section.
1397 // Revision 1.37 1997/07/19 22:34:02 curt
1398 // Moved PI definitions to ../constants.h
1399 // Moved random() stuff to ../Utils/ and renamed fg_random()
1401 // Revision 1.36 1997/07/18 23:41:25 curt
1402 // Tweaks for building with Cygnus Win32 compiler.
1404 // Revision 1.35 1997/07/18 14:28:34 curt
1405 // Hacked in some support for wind/turbulence.
1407 // Revision 1.34 1997/07/16 20:04:48 curt
1408 // Minor tweaks to aid Win32 port.
1410 // Revision 1.33 1997/07/12 03:50:20 curt
1411 // Added an #include <Windows32/Base.h> to help compiling for Win32
1413 // Revision 1.32 1997/07/11 03:23:18 curt
1414 // Solved some scenery display/orientation problems. Still have a positioning
1415 // (or transformation?) problem.
1417 // Revision 1.31 1997/07/11 01:29:58 curt
1418 // More tweaking of terrian floor.
1420 // Revision 1.30 1997/07/10 04:26:37 curt
1421 // We now can interpolated ground elevation for any position in the grid. We
1422 // can use this to enforce a "hard" ground. We still need to enforce some
1423 // bounds checking so that we don't try to lookup data points outside the
1426 // Revision 1.29 1997/07/09 21:31:12 curt
1427 // Working on making the ground "hard."
1429 // Revision 1.28 1997/07/08 18:20:12 curt
1430 // Working on establishing a hard ground.
1432 // Revision 1.27 1997/07/07 20:59:49 curt
1433 // Working on scenery transformations to enable us to fly fluidly over the
1434 // poles with no discontinuity/distortion in scenery.
1436 // Revision 1.26 1997/07/05 20:43:34 curt
1437 // renamed mat3 directory to Math so we could add other math related routines.
1439 // Revision 1.25 1997/06/29 21:19:17 curt
1440 // Working on scenery management system.
1442 // Revision 1.24 1997/06/26 22:14:53 curt
1443 // Beginning work on a scenery management system.
1445 // Revision 1.23 1997/06/26 19:08:33 curt
1446 // Restructuring make, adding automatic "make dep" support.
1448 // Revision 1.22 1997/06/25 15:39:47 curt
1449 // Minor changes to compile with rsxnt/win32.
1451 // Revision 1.21 1997/06/22 21:44:41 curt
1452 // Working on intergrating the VRML (subset) parser.
1454 // Revision 1.20 1997/06/21 17:12:53 curt
1455 // Capitalized subdirectory names.
1457 // Revision 1.19 1997/06/18 04:10:31 curt
1458 // A couple more runway tweaks ...
1460 // Revision 1.18 1997/06/18 02:21:24 curt
1461 // Hacked in a runway
1463 // Revision 1.17 1997/06/17 16:51:58 curt
1464 // Timer interval stuff now uses gettimeofday() instead of ftime()
1466 // Revision 1.16 1997/06/17 04:19:16 curt
1467 // More timer related tweaks with respect to view direction changes.
1469 // Revision 1.15 1997/06/17 03:41:10 curt
1470 // Nonsignal based interval timing is now working.
1471 // This would be a good time to look at cleaning up the code structure a bit.
1473 // Revision 1.14 1997/06/16 19:32:51 curt
1474 // Starting to add general timer support.
1476 // Revision 1.13 1997/06/02 03:40:06 curt
1477 // A tiny bit more view tweaking.
1479 // Revision 1.12 1997/06/02 03:01:38 curt
1480 // Working on views (side, front, back, transitions, etc.)
1482 // Revision 1.11 1997/05/31 19:16:25 curt
1483 // Elevator trim added.
1485 // Revision 1.10 1997/05/31 04:13:52 curt
1486 // WE CAN NOW FLY!!!
1488 // Continuing work on the LaRCsim flight model integration.
1489 // Added some MSFS-like keyboard input handling.
1491 // Revision 1.9 1997/05/30 19:27:01 curt
1492 // The LaRCsim flight model is starting to look like it is working.
1494 // Revision 1.8 1997/05/30 03:54:10 curt
1495 // Made a bit more progress towards integrating the LaRCsim flight model.
1497 // Revision 1.7 1997/05/29 22:39:49 curt
1498 // Working on incorporating the LaRCsim flight model.
1500 // Revision 1.6 1997/05/29 12:31:39 curt
1501 // Minor tweaks, moving towards general flight model integration.
1503 // Revision 1.5 1997/05/29 02:33:23 curt
1504 // Updated to reflect changing interfaces in other "modules."
1506 // Revision 1.4 1997/05/27 17:44:31 curt
1507 // Renamed & rearranged variables and routines. Added some initial simple
1508 // timer/alarm routines so the flight model can be updated on a regular
1511 // Revision 1.3 1997/05/23 15:40:25 curt
1512 // Added GNU copyright headers.
1515 // Revision 1.2 1997/05/23 00:35:12 curt
1516 // Trying to get fog to work ...
1518 // Revision 1.1 1997/05/21 15:57:51 curt
1519 // Renamed due to added GLUT support.
1521 // Revision 1.3 1997/05/19 18:22:42 curt
1522 // Parameter tweaking ... starting to stub in fog support.
1524 // Revision 1.2 1997/05/17 00:17:34 curt
1525 // Trying to stub in support for standard OpenGL.
1527 // Revision 1.1 1997/05/16 16:05:52 curt
1528 // Initial revision.