1 // GLUTmain.cxx -- top level sim routines
3 // Written by Curtis Olson for OpenGL, started May 1997.
5 // Copyright (C) 1997 Curtis L. Olson - curt@me.umn.edu
7 // This program is free software; you can redistribute it and/or
8 // modify it under the terms of the GNU General Public License as
9 // published by the Free Software Foundation; either version 2 of the
10 // License, or (at your option) any later version.
12 // This program is distributed in the hope that it will be useful, but
13 // WITHOUT ANY WARRANTY; without even the implied warranty of
14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 // General Public License for more details.
17 // You should have received a copy of the GNU General Public License
18 // along with this program; if not, write to the Free Software
19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 // (Log is kept at end of this file)
44 #include <sys/stat.h> /* for stat() */
47 # include <unistd.h> /* for stat() */
50 #include <Include/fg_constants.h> // for VERSION
51 #include <Include/general.h>
53 #include <Aircraft/aircraft.hxx>
54 #include <Astro/sky.hxx>
55 #include <Astro/stars.hxx>
56 #include <Astro/solarsystem.hxx>
58 #ifdef ENABLE_AUDIO_SUPPORT
59 # include <Audio/src/sl.h>
60 # include <Audio/src/sm.h>
63 #include <Autopilot/autopilot.hxx>
64 #include <Cockpit/cockpit.hxx>
65 #include <Debug/logstream.hxx>
67 #include <Joystick/joystick.hxx>
68 #include <Math/fg_geodesy.hxx>
69 #include <Math/mat3.h>
70 #include <Math/polar3d.hxx>
72 #include <Scenery/scenery.hxx>
73 #include <Scenery/tilemgr.hxx>
74 #include <Time/event.hxx>
75 #include <Time/fg_time.hxx>
76 #include <Time/fg_timer.hxx>
77 #include <Time/sunpos.hxx>
78 #include <Weather/weather.hxx>
80 #include "GLUTkey.hxx"
81 #include "fg_init.hxx"
82 #include "options.hxx"
87 // This is a record containing global housekeeping information
90 // Specify our current idle function state. This is used to run all
91 // our initializations out of the glutIdleLoop() so that we can get a
92 // splash screen up and running right away.
93 static int idle_state = 0;
98 // Yet another hack, this time for the panel
101 // Global structures for the Audio library
102 #ifdef ENABLE_AUDIO_SUPPORT
103 slEnvelope pitch_envelope ( 1, SL_SAMPLE_ONE_SHOT ) ;
104 slEnvelope volume_envelope ( 1, SL_SAMPLE_ONE_SHOT ) ;
105 slScheduler *audio_sched;
106 smMixer *audio_mixer;
112 // The following defines flight gear options. Because glutlib will also
113 // want to parse its own options, those options must not be included here
114 // or they will get parsed by the main program option parser. Hence case
115 // is significant for any option added that might be in conflict with
118 // glutlib parses for:
120 // -direct (invalid in Win32)
124 // -indirect (invalid in Win32)
127 // Note that glutlib depends upon strings while this program's
128 // option parser wants only initial characters followed by numbers
133 // fgInitVisuals() -- Initialize various GL/view parameters
134 static void fgInitVisuals( void ) {
138 l = &cur_light_params;
139 w = ¤t_weather;
141 // Go full screen if requested ...
142 if ( current_options.get_fullscreen() ) {
146 // If enabled, normal vectors specified with glNormal are scaled
147 // to unit length after transformation. See glNormal.
148 // xglEnable( GL_NORMALIZE );
150 xglEnable( GL_LIGHTING );
151 xglEnable( GL_LIGHT0 );
152 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
154 // xglFogi (GL_FOG_MODE, GL_LINEAR);
155 xglFogi (GL_FOG_MODE, GL_EXP2);
156 // Fog density is now set when the weather system is initialized
157 // xglFogf (GL_FOG_DENSITY, w->fog_density);
158 if ( (current_options.get_fog() == 1) ||
159 (current_options.get_shading() == 0) ) {
160 // if fastest fog requested, or if flat shading force fastest
161 xglHint ( GL_FOG_HINT, GL_FASTEST );
162 } else if ( current_options.get_fog() == 2 ) {
163 xglHint ( GL_FOG_HINT, GL_NICEST );
165 if ( current_options.get_wireframe() ) {
167 xglPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
170 // This is the default anyways, but it can't hurt
171 xglFrontFace ( GL_CCW );
174 // xglEnable(GL_POINT_SMOOTH);
175 // xglEnable(GL_LINE_SMOOTH);
176 // xglEnable(GL_POLYGON_SMOOTH);
180 #ifdef IS_THIS_BETTER_THAN_A_ZERO_CHARLIE
181 // Draw a basic instrument panel
182 static void fgUpdateInstrViewParams( void ) {
190 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) / 2);
192 xglMatrixMode(GL_PROJECTION);
196 gluOrtho2D(0, 640, 0, 480);
197 xglMatrixMode(GL_MODELVIEW);
201 xglColor3f(1.0, 1.0, 1.0);
204 xglDisable(GL_DEPTH_TEST);
205 xglDisable(GL_LIGHTING);
208 xglColor3f (0.5, 0.5, 0.5);
211 xglVertex2f(0.0, 0.00);
212 xglVertex2f(0.0, 480.0);
213 xglVertex2f(640.0,480.0);
214 xglVertex2f(640.0, 0.0);
217 xglRectf(0.0,0.0, 640, 480);
218 xglEnable(GL_DEPTH_TEST);
219 xglEnable(GL_LIGHTING);
220 xglMatrixMode(GL_PROJECTION);
222 xglMatrixMode(GL_MODELVIEW);
228 // Update all Visuals (redraws anything graphics related)
229 static void fgRenderFrame( void ) {
235 static int iteration = 0;
236 // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
237 GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
238 GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
239 GLbitfield clear_mask;
241 f = current_aircraft.flight;
242 l = &cur_light_params;
243 t = &cur_time_params;
246 if ( idle_state != 1000 ) {
247 // still initializing, draw the splash screen
248 if ( current_options.get_splash_screen() == 1 ) {
252 // idle_state is now 1000 meaning we've finished all our
253 // initializations and are running the main loop, so this will
254 // now work without seg faulting the system.
256 // printf("Ground = %.2f Altitude = %.2f\n", scenery.cur_elev,
257 // FG_Altitude * FEET_TO_METER);
259 // this is just a temporary hack, to make me understand Pui
260 // timerText -> setLabel (ctime (&t->cur_time));
263 // update view volume parameters
264 v->UpdateViewParams();
266 clear_mask = GL_DEPTH_BUFFER_BIT;
267 if ( current_options.get_wireframe() ) {
268 clear_mask |= GL_COLOR_BUFFER_BIT;
270 if ( current_options.get_panel_status() ) {
271 // we can't clear the screen when the panel is active
272 } else if ( current_options.get_skyblend() ) {
273 if ( current_options.get_textures() ) {
274 // glClearColor(black[0], black[1], black[2], black[3]);
275 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
276 l->adj_fog_color[2], l->adj_fog_color[3]);
277 clear_mask |= GL_COLOR_BUFFER_BIT;
280 glClearColor(l->sky_color[0], l->sky_color[1],
281 l->sky_color[2], l->sky_color[3]);
282 clear_mask |= GL_COLOR_BUFFER_BIT;
284 xglClear( clear_mask );
286 // Tell GL we are switching to model view parameters
287 xglMatrixMode(GL_MODELVIEW);
288 // xglLoadIdentity();
291 xglDisable( GL_DEPTH_TEST );
292 xglDisable( GL_LIGHTING );
293 xglDisable( GL_CULL_FACE );
294 xglDisable( GL_FOG );
295 xglShadeModel( GL_SMOOTH );
296 if ( current_options.get_skyblend() ) {
300 // setup transformation for drawing astronomical objects
302 // Translate to view position
303 xglTranslatef( v->view_pos.x(), v->view_pos.y(), v->view_pos.z() );
304 // Rotate based on gst (sidereal time)
305 // note: constant should be 15.041085, Curt thought it was 15
306 angle = t->gst * 15.041085;
307 // printf("Rotating astro objects by %.2f degrees\n",angle);
308 xglRotatef( angle, 0.0, 0.0, -1.0 );
310 // draw stars and planets
312 SolarSystem::theSolarSystem->draw();
317 if ( current_options.get_shading() ) {
318 xglShadeModel( GL_SMOOTH );
320 xglShadeModel( GL_FLAT );
322 xglEnable( GL_DEPTH_TEST );
323 if ( current_options.get_fog() > 0 ) {
325 xglFogfv (GL_FOG_COLOR, l->adj_fog_color);
327 // set lighting parameters
328 xglLightfv(GL_LIGHT0, GL_AMBIENT, l->scene_ambient );
329 xglLightfv(GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
331 if ( current_options.get_textures() ) {
332 // texture parameters
333 xglEnable( GL_TEXTURE_2D );
334 xglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
335 xglHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
336 // set base color (I don't think this is doing anything here)
337 xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
338 xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
340 xglDisable( GL_TEXTURE_2D );
341 xglMaterialfv (GL_FRONT, GL_AMBIENT, terrain_color);
342 xglMaterialfv (GL_FRONT, GL_DIFFUSE, terrain_color);
343 // xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
344 // xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
349 xglDisable( GL_TEXTURE_2D );
351 if ( (iteration == 0) && (current_options.get_panel_status()) ) {
352 // Did we run this loop before ?? ...and do we need the panel ??
356 // display HUD && Panel
357 if ( current_options.get_panel_status() ) {
358 xglViewport(0, 0, v->winWidth, v->winHeight);
361 iteration = 1; // don't ReInit the panel in the future
363 // We can do translucent menus, so why not. :-)
364 xglEnable ( GL_BLEND ) ;
365 xglBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
367 xglDisable ( GL_BLEND ) ;
374 // Update internal time dependent calculations (i.e. flight model)
375 void fgUpdateTimeDepCalcs(int multi_loop) {
382 f = current_aircraft.flight;
383 l = &cur_light_params;
384 t = &cur_time_params;
387 // update the flight model
388 if ( multi_loop < 0 ) {
389 multi_loop = DEFAULT_MULTILOOP;
393 // run Autopilot system
396 // printf("updating flight model x %d\n", multi_loop);
397 fgFlightModelUpdate(current_options.get_flight_model(), f, multi_loop);
399 fgFlightModelUpdate(current_options.get_flight_model(), f, 0);
402 // update the view angle
403 for ( i = 0; i < multi_loop; i++ ) {
404 if ( fabs(v->goal_view_offset - v->view_offset) < 0.05 ) {
405 v->view_offset = v->goal_view_offset;
408 // move v->view_offset towards v->goal_view_offset
409 if ( v->goal_view_offset > v->view_offset ) {
410 if ( v->goal_view_offset - v->view_offset < FG_PI ) {
411 v->view_offset += 0.01;
413 v->view_offset -= 0.01;
416 if ( v->view_offset - v->goal_view_offset < FG_PI ) {
417 v->view_offset -= 0.01;
419 v->view_offset += 0.01;
422 if ( v->view_offset > FG_2PI ) {
423 v->view_offset -= FG_2PI;
424 } else if ( v->view_offset < 0 ) {
425 v->view_offset += FG_2PI;
430 double tmp = -(l->sun_rotation + FG_PI) - (FG_Psi - v->view_offset);
431 while ( tmp < 0.0 ) {
434 while ( tmp > FG_2PI ) {
437 /* printf("Psi = %.2f, viewoffset = %.2f sunrot = %.2f rottosun = %.2f\n",
438 FG_Psi * RAD_TO_DEG, v->view_offset * RAD_TO_DEG,
439 -(l->sun_rotation+FG_PI) * RAD_TO_DEG, tmp * RAD_TO_DEG); */
444 void fgInitTimeDepCalcs( void ) {
447 #ifdef HAVE_SETITIMER
448 fgTimerInit( 1.0 / DEFAULT_TIMER_HZ, fgUpdateTimeDepCalcs );
449 #endif HAVE_SETITIMER
453 static const double alt_adjust_ft = 3.758099;
454 static const double alt_adjust_m = alt_adjust_ft * FEET_TO_METER;
456 // What should we do when we have nothing else to do? Let's get ready
457 // for the next move and update the display?
458 static void fgMainLoop( void ) {
462 static int remainder = 0;
463 int elapsed, multi_loop;
467 f = current_aircraft.flight;
469 t = &cur_time_params;
471 FG_LOG( FG_ALL, FG_DEBUG, "Running Main Loop");
472 FG_LOG( FG_ALL, FG_DEBUG, "======= ==== ====");
476 // Fix elevation. I'm just sticking this here for now, it should
477 // probably move eventually
479 /* printf("Before - ground = %.2f runway = %.2f alt = %.2f\n",
481 FG_Runway_altitude * FEET_TO_METER,
482 FG_Altitude * FEET_TO_METER); */
484 if ( scenery.cur_elev > -9990 ) {
485 if ( FG_Altitude * FEET_TO_METER <
486 (scenery.cur_elev + alt_adjust_m - 3.0) ) {
487 // now set aircraft altitude above ground
488 printf("Current Altitude = %.2f < %.2f forcing to %.2f\n",
489 FG_Altitude * FEET_TO_METER,
490 scenery.cur_elev + alt_adjust_m - 3.0,
491 scenery.cur_elev + alt_adjust_m );
492 fgFlightModelSetAltitude( current_options.get_flight_model(), f,
493 scenery.cur_elev + alt_adjust_m );
495 FG_LOG( FG_ALL, FG_BULK,
496 "<*> resetting altitude to "
497 << FG_Altitude * FEET_TO_METER << " meters" );
499 FG_Runway_altitude = scenery.cur_elev * METER_TO_FEET;
502 /* printf("Adjustment - ground = %.2f runway = %.2f alt = %.2f\n",
504 FG_Runway_altitude * FEET_TO_METER,
505 FG_Altitude * FEET_TO_METER); */
510 #if defined( ENABLE_LINUX_JOYSTICK )
511 // Read joystick and update control settings
513 #elif defined( ENABLE_GLUT_JOYSTICK )
514 // Glut joystick support works by feeding a joystick handler
515 // function to glut. This is taken care of once in the joystick
516 // init routine and we don't have to worry about it again.
519 // Get elapsed time for this past frame
520 elapsed = fgGetTimeInterval();
521 FG_LOG( FG_ALL, FG_BULK,
522 "Time interval is = " << elapsed
523 << ", previous remainder is = " << remainder );
525 // Calculate frame rate average
526 if ( elapsed > 0.0 ) {
528 for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
529 accum += g->frames[i];
530 // printf("frame[%d] = %.2f\n", i, g->frames[i]);
531 g->frames[i+1] = g->frames[i];
533 g->frames[0] = 1000.0 / (float)elapsed;
534 // printf("frame[0] = %.2f\n", g->frames[0]);
535 accum += g->frames[0];
536 g->frame_rate = accum / (float)FG_FRAME_RATE_HISTORY;
537 // printf("ave = %.2f\n", g->frame_rate);
540 // Calculate model iterations needed for next frame
541 FG_LOG( FG_ALL, FG_DEBUG,
542 "--> Frame rate is = " << g->frame_rate );
543 elapsed += remainder;
545 multi_loop = (int)(((float)elapsed * 0.001) * DEFAULT_MODEL_HZ);
546 remainder = elapsed - ((multi_loop*1000) / DEFAULT_MODEL_HZ);
547 FG_LOG( FG_ALL, FG_BULK,
548 "Model iterations needed = " << multi_loop
549 << ", new remainder = " << remainder );
551 /* printf("right before fm - ground = %.2f runway = %.2f alt = %.2f\n",
553 FG_Runway_altitude * FEET_TO_METER,
554 FG_Altitude * FEET_TO_METER); */
557 if ( ! use_signals ) {
559 fgUpdateTimeDepCalcs(multi_loop);
562 /* printf("After fm - ground = %.2f runway = %.2f alt = %.2f\n",
564 FG_Runway_altitude * FEET_TO_METER,
565 FG_Altitude * FEET_TO_METER); */
567 // fgAircraftOutputCurrent(a);
569 // see if we need to load any new scenery tiles
572 // Process/manage pending events
573 global_events.Process();
575 // Run audio scheduler
576 #ifdef ENABLE_AUDIO_SUPPORT
577 if ( current_options.get_sound() && audio_sched->working() ) {
578 double param = controls.get_throttle( 0 ) * 2.0 + 1.0;
580 pitch_envelope.setStep ( 0, 0.01, param );
581 volume_envelope.setStep ( 0, 0.01, param );
583 audio_sched -> update();
590 FG_LOG( FG_ALL, FG_DEBUG, "" );
594 // This is the top level master main function that is registered as
598 // The first few passes take care of initialization things (a couple
599 // per pass) and once everything has been initialized fgMainLoop from
602 static void fgIdleFunction ( void ) {
606 // printf("idle state == %d\n", idle_state);
608 if ( idle_state == 0 ) {
609 // Initialize the splash screen right away
610 if ( current_options.get_splash_screen() ) {
615 } else if ( idle_state == 1 ) {
616 // Start the intro music
618 if ( current_options.get_intro_music() ) {
619 string lockfile = "/tmp/mpg123.running";
620 string mp3file = current_options.get_fg_root() +
622 string command = "(touch " + lockfile + "; mpg123 " + mp3file +
623 "> /dev/null 2>&1; /bin/rm " + lockfile + ") &";
624 FG_LOG( FG_GENERAL, FG_INFO,
625 "Starting intro music: " << mp3file );
626 system ( command.c_str() );
631 } else if ( idle_state == 2 ) {
632 // These are a few miscellaneous things that aren't really
633 // "subsystems" but still need to be initialized.
636 if ( strstr ( g->glRenderer, "Glide" ) ) {
637 grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
642 } else if ( idle_state == 3 ) {
643 // This is the top level init routine which calls all the
644 // other subsystem initialization routines. If you are adding
645 // a subsystem to flight gear, its initialization call should
646 // located in this routine.
647 if( !fgInitSubsystems()) {
648 FG_LOG( FG_GENERAL, FG_ALERT,
649 "Subsystem initializations failed ..." );
654 } else if ( idle_state == 4 ) {
655 // setup OpenGL view parameters
659 // init timer routines, signals, etc. Arrange for an alarm
660 // signal to be generated, etc.
661 fgInitTimeDepCalcs();
665 } else if ( idle_state == 5 ) {
668 } else if ( idle_state == 6 ) {
669 // Initialize audio support
670 #ifdef ENABLE_AUDIO_SUPPORT
673 if ( current_options.get_intro_music() ) {
674 // Let's wait for mpg123 to finish
675 string lockfile = "/tmp/mpg123.running";
676 struct stat stat_buf;
678 FG_LOG( FG_GENERAL, FG_INFO,
679 "Waiting for mpg123 player to finish ..." );
680 while ( stat(lockfile.c_str(), &stat_buf) == 0 ) {
681 // file exist, wait ...
683 FG_LOG( FG_GENERAL, FG_INFO, ".");
685 FG_LOG( FG_GENERAL, FG_INFO, "");
689 audio_sched = new slScheduler ( 8000 );
690 audio_mixer = new smMixer;
691 audio_mixer -> setMasterVolume ( 50 ) ; /* 80% of max volume. */
692 audio_sched -> setSafetyMargin ( 1.0 ) ;
693 string slfile = current_options.get_fg_root() + "/Sounds/wasp.wav";
695 s1 = new slSample ( (char *)slfile.c_str() );
696 printf("Rate = %d Bps = %d Stereo = %d\n",
697 s1 -> getRate(), s1 -> getBps(), s1 -> getStereo());
698 audio_sched -> loopSample ( s1 );
700 if ( audio_sched->working() ) {
701 pitch_envelope.setStep ( 0, 0.01, 0.6 );
702 volume_envelope.setStep ( 0, 0.01, 0.6 );
704 audio_sched -> addSampleEnvelope( s1, 0, 0, &
707 audio_sched -> addSampleEnvelope( s1, 0, 1,
709 SL_VOLUME_ENVELOPE );
712 // strcpy(slfile, path);
713 // strcat(slfile, "thunder.wav");
714 // s2 -> loadFile ( slfile );
715 // s2 -> adjustVolume(0.5);
716 // audio_sched -> playSample ( s2 );
723 if ( idle_state == 1000 ) {
724 // We've finished all our initialization steps, from now on we
725 // run the main loop.
729 if ( current_options.get_splash_screen() == 1 ) {
736 // Handle new window size or exposure
737 static void fgReshape( int width, int height ) {
742 // Do this so we can call fgReshape(0,0) ourselves without having
743 // to know what the values of width & height are.
744 if ( (height > 0) && (width > 0) ) {
745 if ( ! current_options.get_panel_status() ) {
746 v->win_ratio = (GLfloat) width / (GLfloat) height;
748 v->win_ratio = (GLfloat) width / ((GLfloat) (height)*0.67);
753 v->winHeight = height;
755 // Inform gl of our view window size (now handled elsewhere)
756 // xglViewport(0, 0, (GLint)width, (GLint)height);
757 if ( idle_state == 1000 ) {
758 // yes we've finished all our initializations and are running
759 // the main loop, so this will now work without seg faulting
761 v->UpdateViewParams();
762 if ( current_options.get_panel_status() ) {
767 // xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
771 // Initialize GLUT and define a main window
772 int fgGlutInit( int *argc, char **argv ) {
773 // GLUT will extract all glut specific options so later on we only
774 // need wory about our own.
775 xglutInit(argc, argv);
777 // Define Display Parameters
778 if ( ! current_options.get_panel_status() ) {
779 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
781 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE |
785 // Define initial window size
786 xglutInitWindowSize(640, 480);
788 // Initialize windows
789 if ( current_options.get_game_mode() == 0 ) {
790 // Open the regular window
791 xglutCreateWindow("Flight Gear");
793 // Open the cool new 'game mode' window
794 glutGameModeString("width=640 height=480 bpp=16");
802 // Initialize GLUT event handlers
803 int fgGlutInitEvents( void ) {
804 // call fgReshape() on window resizes
805 xglutReshapeFunc( fgReshape );
807 // call GLUTkey() on keyboard event
808 xglutKeyboardFunc( GLUTkey );
809 glutSpecialFunc( GLUTspecialkey );
811 // call guiMouseFunc() whenever our little rodent is used
812 glutMouseFunc ( guiMouseFunc );
813 glutMotionFunc (guiMotionFunc );
814 glutPassiveMotionFunc (guiMotionFunc );
816 // call fgMainLoop() whenever there is
817 // nothing else to do
818 xglutIdleFunc( fgIdleFunction );
821 xglutDisplayFunc( fgRenderFrame );
828 int main( int argc, char **argv ) {
831 f = current_aircraft.flight;
834 _control87(MCW_EM, MCW_EM); /* defined in float.h */
837 // Initialize the [old] debugging output system
840 FG_LOG( FG_GENERAL, FG_INFO, "Flight Gear: Version" << VERSION << endl );
842 // Attempt to locate and parse a config file
843 // First check fg_root
844 string config = current_options.get_fg_root() + "/system.fgfsrc";
845 current_options.parse_config_file( config );
847 // Next check home directory
848 char* envp = ::getenv( "HOME" );
849 if ( envp != NULL ) {
851 config += "/.fgfsrc";
852 current_options.parse_config_file( config );
855 // Parse remaining command line options
856 // These will override anything specified in a config file
857 if ( current_options.parse_command_line(argc, argv) !=
858 fgOPTIONS::FG_OPTIONS_OK )
860 // Something must have gone horribly wrong with the command
861 // line parsing or maybe the user just requested help ... :-)
862 current_options.usage();
863 FG_LOG( FG_GENERAL, FG_ALERT, "\nExiting ...");
867 // Initialize the Window/Graphics environment.
868 if( !fgGlutInit(&argc, argv) ) {
869 FG_LOG( FG_GENERAL, FG_ALERT, "GLUT initialization failed ..." );
873 // Initialize the various GLUT Event Handlers.
874 if( !fgGlutInitEvents() ) {
875 FG_LOG( FG_GENERAL, FG_ALERT,
876 "GLUT event handler initialization failed ..." );
880 // First do some quick general initializations
881 if( !fgInitGeneral()) {
882 FG_LOG( FG_GENERAL, FG_ALERT,
883 "General initializations failed ..." );
887 // Init the user interface (we need to do this before passing off
891 // pass control off to the master GLUT event handler
894 // we never actually get here ... but just in case ... :-)
900 // Revision 1.63 1998/11/06 21:18:08 curt
901 // Converted to new logstream debugging facility. This allows release
902 // builds with no messages at all (and no performance impact) by using
903 // the -DFG_NDEBUG flag.
905 // Revision 1.62 1998/10/27 02:14:35 curt
906 // Changes to support GLUT joystick routines as fall back.
908 // Revision 1.61 1998/10/25 14:08:47 curt
909 // Turned "struct fgCONTROLS" into a class, with inlined accessor functions.
911 // Revision 1.60 1998/10/25 10:57:18 curt
912 // Changes to use the new joystick library if it is available.
914 // Revision 1.59 1998/10/17 01:34:21 curt
917 // Revision 1.58 1998/10/16 23:27:52 curt
920 // Revision 1.57 1998/10/16 00:54:00 curt
921 // Converted to Point3D class.
923 // Revision 1.56 1998/10/02 12:46:47 curt
924 // Added an "auto throttle"
926 // Revision 1.55 1998/09/29 14:58:18 curt
927 // Use working() instead of !not_working() for audio.
929 // Revision 1.54 1998/09/29 02:03:38 curt
932 // Revision 1.53 1998/09/26 13:18:35 curt
933 // Check if audio "working()" before doing audio manipulations.
935 // Revision 1.52 1998/09/25 16:02:07 curt
936 // Added support for pitch and volume envelopes and tied them to the
939 // Revision 1.51 1998/09/15 04:27:28 curt
940 // Changes for new Astro code.
942 // Revision 1.50 1998/09/15 02:09:24 curt
943 // Include/fg_callback.hxx
944 // Moved code inline to stop g++ 2.7 from complaining.
946 // Simulator/Time/event.[ch]xx
947 // Changed return type of fgEVENT::printStat(). void caused g++ 2.7 to
948 // complain bitterly.
950 // Minor bugfix and changes.
952 // Simulator/Main/GLUTmain.cxx
953 // Added missing type to idle_state definition - eliminates a warning.
955 // Simulator/Main/fg_init.cxx
956 // Changes to airport lookup.
958 // Simulator/Main/options.cxx
959 // Uses fg_gzifstream when loading config file.
961 // Revision 1.49 1998/09/09 16:25:39 curt
962 // Only use GLUT_STENCIL if the instument panel has been requested.
964 // Revision 1.48 1998/08/28 18:15:03 curt
965 // Added new cockpit code from Friedemann Reinhard
966 // <mpt218@faupt212.physik.uni-erlangen.de>
968 // Revision 1.47 1998/08/27 17:02:04 curt
969 // Contributions from Bernie Bright <bbright@c031.aone.net.au>
970 // - use strings for fg_root and airport_id and added methods to return
972 // - inlined all access methods,
973 // - made the parsing functions private methods,
974 // - deleted some unused functions.
975 // - propogated some of these changes out a bit further.
977 // Revision 1.46 1998/08/22 14:49:56 curt
978 // Attempting to iron out seg faults and crashes.
979 // Did some shuffling to fix a initialization order problem between view
980 // position, scenery elevation.
982 // Revision 1.45 1998/08/20 20:32:31 curt
983 // Reshuffled some of the code in and around views.[ch]xx
985 // Revision 1.44 1998/08/20 15:10:33 curt
986 // Added GameGLUT support.
988 // Revision 1.43 1998/08/12 21:01:47 curt
989 // Master volume from 30% -> 80%
991 // Revision 1.42 1998/07/30 23:48:25 curt
992 // Output position & orientation when pausing.
993 // Eliminated libtool use.
994 // Added options to specify initial position and orientation.
995 // Changed default fov to 55 degrees.
996 // Added command line option to start in paused or unpaused state.
998 // Revision 1.41 1998/07/27 18:41:24 curt
999 // Added a pause command "p"
1000 // Fixed some initialization order problems between pui and glut.
1001 // Added an --enable/disable-sound option.
1003 // Revision 1.40 1998/07/24 21:56:59 curt
1004 // 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.
1006 // Revision 1.39 1998/07/24 21:39:08 curt
1007 // Debugging output tweaks.
1008 // Cast glGetString to (char *) to avoid compiler errors.
1009 // Optimizations to fgGluLookAt() by Norman Vine.
1011 // Revision 1.38 1998/07/22 21:40:43 curt
1012 // Clear to adjusted fog color (for sunrise/sunset effects)
1013 // Make call to fog sunrise/sunset adjustment method.
1014 // Add a stdc++ library bug work around to fg_init.cxx
1016 // Revision 1.37 1998/07/20 12:49:44 curt
1017 // Tweaked color buffer clearing defaults. We clear the color buffer if we
1018 // are doing textures. Assumptions: If we are doing textures we have hardware
1019 // support that can clear the color buffer for "free." If we are doing software
1020 // rendering with textures, then the extra clear time gets lost in the noise.
1022 // Revision 1.36 1998/07/16 17:33:35 curt
1023 // "H" / "h" now control hud brightness as well with off being one of the
1025 // Better checking for xmesa/fx 3dfx fullscreen/window support for deciding
1026 // whether or not to build in the feature.
1027 // Translucent menu support.
1028 // HAVE_AUDIO_SUPPORT -> ENABLE_AUDIO_SUPPORT
1029 // Use fork() / wait() for playing mp3 init music in background under unix.
1030 // Changed default tile diameter to 5.
1032 // Revision 1.35 1998/07/13 21:01:36 curt
1033 // Wrote access functions for current fgOPTIONS.
1035 // Revision 1.34 1998/07/13 15:32:37 curt
1036 // Clear color buffer if drawing wireframe.
1037 // When specifying and airport, start elevation at -1000 and let the system
1038 // position you at ground level.
1040 // Revision 1.33 1998/07/12 03:14:42 curt
1041 // Added ground collision detection.
1042 // Did some serious horsing around to be able to "hug" the ground properly
1043 // and still be able to take off.
1044 // Set the near clip plane to 1.0 meters when less than 10 meters above the
1046 // Did some serious horsing around getting the initial airplane position to be
1047 // correct based on rendered terrain elevation.
1048 // Added a little cheat/hack that will prevent the view position from ever
1049 // dropping below the terrain, even when the flight model doesn't quite
1050 // put you as high as you'd like.
1052 // Revision 1.32 1998/07/08 14:45:07 curt
1053 // polar3d.h renamed to polar3d.hxx
1054 // vector.h renamed to vector.hxx
1055 // updated audio support so it waits to create audio classes (and tie up
1056 // /dev/dsp) until the mpg123 player is finished.
1058 // Revision 1.31 1998/07/06 21:34:17 curt
1059 // Added an enable/disable splash screen option.
1060 // Added an enable/disable intro music option.
1061 // Added an enable/disable instrument panel option.
1062 // Added an enable/disable mouse pointer option.
1063 // Added using namespace std for compilers that support this.
1065 // Revision 1.30 1998/07/06 02:42:03 curt
1066 // Added support for switching between fullscreen and window mode for
1069 // Added a basic splash screen. Restructured the main loop and top level
1070 // initialization routines to do this.
1072 // Hacked in some support for playing a startup mp3 sound file while rest
1073 // of sim initializes. Currently only works in Unix using the mpg123 player.
1074 // Waits for the mpg123 player to finish before initializing internal
1077 // Revision 1.29 1998/07/04 00:52:22 curt
1078 // Add my own version of gluLookAt() (which is nearly identical to the
1079 // Mesa/glu version.) But, by calculating the Model View matrix our selves
1080 // we can save this matrix without having to read it back in from the video
1081 // card. This hopefully allows us to save a few cpu cycles when rendering
1082 // out the fragments because we can just use glLoadMatrixd() with the
1083 // precalculated matrix for each tile rather than doing a push(), translate(),
1084 // pop() for every fragment.
1086 // Panel status defaults to off for now until it gets a bit more developed.
1088 // Extract OpenGL driver info on initialization.
1090 // Revision 1.28 1998/06/27 16:54:32 curt
1091 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
1092 // Don't change the view port when displaying the panel.
1094 // Revision 1.27 1998/06/17 21:35:10 curt
1095 // Refined conditional audio support compilation.
1096 // Moved texture parameter setup calls to ../Scenery/materials.cxx
1097 // #include <string.h> before various STL includes.
1098 // Make HUD default state be enabled.
1100 // Revision 1.26 1998/06/13 00:40:32 curt
1101 // Tweaked fog command line options.
1103 // Revision 1.25 1998/06/12 14:27:26 curt
1104 // Pui -> PUI, Gui -> GUI.
1106 // Revision 1.24 1998/06/12 00:57:39 curt
1107 // Added support for Pui/Gui.
1108 // Converted fog to GL_FOG_EXP2.
1109 // Link to static simulator parts.
1110 // Update runfg.bat to try to be a little smarter.
1112 // Revision 1.23 1998/06/08 17:57:04 curt
1113 // Minor sound/startup position tweaks.
1115 // Revision 1.22 1998/06/05 18:18:40 curt
1116 // A bit of fiddling with audio ...
1118 // Revision 1.21 1998/06/03 22:01:06 curt
1119 // Tweaking sound library usage.
1121 // Revision 1.20 1998/06/03 00:47:11 curt
1122 // Updated to compile in audio support if OSS available.
1123 // Updated for new version of Steve's audio library.
1124 // STL includes don't use .h
1125 // Small view optimizations.
1127 // Revision 1.19 1998/06/01 17:54:40 curt
1128 // Added Linux audio support.
1129 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
1132 // Revision 1.18 1998/05/29 20:37:19 curt
1133 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
1134 // Read airport list into a "map" STL for dynamic list sizing and fast tree
1137 // Revision 1.17 1998/05/22 21:28:52 curt
1138 // Modifications to use the new fgEVENT_MGR class.
1140 // Revision 1.16 1998/05/20 20:51:33 curt
1141 // Tweaked smooth shaded texture lighting properties.
1142 // Converted fgLIGHT to a C++ class.
1144 // Revision 1.15 1998/05/16 13:08:34 curt
1145 // C++ - ified views.[ch]xx
1146 // Shuffled some additional view parameters into the fgVIEW class.
1147 // Changed tile-radius to tile-diameter because it is a much better
1149 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
1150 // to transform world space to eye space for view frustum culling.
1152 // Revision 1.14 1998/05/13 18:29:57 curt
1153 // Added a keyboard binding to dynamically adjust field of view.
1154 // Added a command line option to specify fov.
1155 // Adjusted terrain color.
1156 // Root path info moved to fgOPTIONS.
1157 // Added ability to parse options out of a config file.
1159 // Revision 1.13 1998/05/11 18:18:15 curt
1160 // For flat shading use "glHint (GL_FOG_HINT, GL_FASTEST )"
1162 // Revision 1.12 1998/05/07 23:14:15 curt
1163 // Added "D" key binding to set autopilot heading.
1164 // Made frame rate calculation average out over last 10 frames.
1165 // Borland C++ floating point exception workaround.
1166 // Added a --tile-radius=n option.
1168 // Revision 1.11 1998/05/06 03:16:23 curt
1169 // Added an averaged global frame rate counter.
1170 // Added an option to control tile radius.
1172 // Revision 1.10 1998/05/03 00:47:31 curt
1173 // Added an option to enable/disable full-screen mode.
1175 // Revision 1.9 1998/04/30 12:34:17 curt
1176 // Added command line rendering options:
1177 // enable/disable fog/haze
1178 // specify smooth/flat shading
1179 // disable sky blending and just use a solid color
1180 // enable wireframe drawing mode
1182 // Revision 1.8 1998/04/28 01:20:21 curt
1183 // Type-ified fgTIME and fgVIEW.
1184 // Added a command line option to disable textures.
1186 // Revision 1.7 1998/04/26 05:10:02 curt
1187 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
1189 // Revision 1.6 1998/04/25 22:06:30 curt
1190 // Edited cvs log messages in source files ... bad bad bad!
1192 // Revision 1.5 1998/04/25 20:24:01 curt
1193 // Cleaned up initialization sequence to eliminate interdependencies
1194 // between sun position, lighting, and view position. This creates a
1195 // valid single pass initialization path.
1197 // Revision 1.4 1998/04/24 14:19:30 curt
1200 // Revision 1.3 1998/04/24 00:49:18 curt
1201 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
1202 // Trying out some different option parsing code.
1203 // Some code reorganization.
1205 // Revision 1.2 1998/04/22 13:25:41 curt
1206 // C++ - ifing the code.
1207 // Starting a bit of reorganization of lighting code.
1209 // Revision 1.1 1998/04/21 17:02:39 curt
1210 // Prepairing for C++ integration.
1212 // Revision 1.71 1998/04/18 04:11:26 curt
1213 // Moved fg_debug to it's own library, added zlib support.
1215 // Revision 1.70 1998/04/14 02:21:02 curt
1216 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
1217 // <jgoeke@voyager.net>
1219 // Revision 1.69 1998/04/08 23:35:34 curt
1220 // Tweaks to Gnu automake/autoconf system.
1222 // Revision 1.68 1998/04/03 22:09:03 curt
1223 // Converting to Gnu autoconf system.
1225 // Revision 1.67 1998/03/23 21:24:37 curt
1226 // Source code formating tweaks.
1228 // Revision 1.66 1998/03/14 00:31:20 curt
1229 // Beginning initial terrain texturing experiments.
1231 // Revision 1.65 1998/03/09 22:45:57 curt
1232 // Minor tweaks for building on sparc platform.
1234 // Revision 1.64 1998/02/20 00:16:23 curt
1235 // Thursday's tweaks.
1237 // Revision 1.63 1998/02/16 16:17:39 curt
1240 // Revision 1.62 1998/02/16 13:39:42 curt
1241 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
1242 // tiles to occasionally be missing.
1244 // Revision 1.61 1998/02/12 21:59:46 curt
1245 // Incorporated code changes contributed by Charlie Hotchkiss
1246 // <chotchkiss@namg.us.anritsu.com>
1248 // Revision 1.60 1998/02/11 02:50:40 curt
1251 // Revision 1.59 1998/02/09 22:56:54 curt
1252 // Removed "depend" files from cvs control. Other minor make tweaks.
1254 // Revision 1.58 1998/02/09 15:07:49 curt
1257 // Revision 1.57 1998/02/07 15:29:40 curt
1258 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
1259 // <chotchkiss@namg.us.anritsu.com>
1261 // Revision 1.56 1998/02/03 23:20:23 curt
1262 // Lots of little tweaks to fix various consistency problems discovered by
1263 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
1264 // passed arguments along to the real printf(). Also incorporated HUD changes
1265 // by Michele America.
1267 // Revision 1.55 1998/02/02 20:53:58 curt
1268 // Incorporated Durk's changes.
1270 // Revision 1.54 1998/01/31 00:43:10 curt
1271 // Added MetroWorks patches from Carmen Volpe.
1273 // Revision 1.53 1998/01/27 18:35:54 curt
1276 // Revision 1.52 1998/01/27 00:47:56 curt
1277 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
1278 // system and commandline/config file processing code.
1280 // Revision 1.51 1998/01/26 15:57:05 curt
1281 // Tweaks for dynamic scenery development.
1283 // Revision 1.50 1998/01/19 19:27:07 curt
1284 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
1285 // This should simplify things tremendously.
1287 // Revision 1.49 1998/01/19 18:40:31 curt
1288 // Tons of little changes to clean up the code and to remove fatal errors
1289 // when building with the c++ compiler.
1291 // Revision 1.48 1998/01/19 18:35:46 curt
1292 // Minor tweaks and fixes for cygwin32.
1294 // Revision 1.47 1998/01/13 00:23:08 curt
1295 // Initial changes to support loading and management of scenery tiles. Note,
1296 // there's still a fair amount of work left to be done.
1298 // Revision 1.46 1998/01/08 02:22:06 curt
1299 // Beginning to integrate Tile management subsystem.
1301 // Revision 1.45 1998/01/07 03:18:55 curt
1302 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
1304 // Revision 1.44 1997/12/30 22:22:31 curt
1305 // Further integration of event manager.
1307 // Revision 1.43 1997/12/30 20:47:43 curt
1308 // Integrated new event manager with subsystem initializations.
1310 // Revision 1.42 1997/12/30 16:36:47 curt
1311 // Merged in Durk's changes ...
1313 // Revision 1.41 1997/12/30 13:06:56 curt
1314 // A couple lighting tweaks ...
1316 // Revision 1.40 1997/12/30 01:38:37 curt
1317 // Switched back to per vertex normals and smooth shading for terrain.
1319 // Revision 1.39 1997/12/22 23:45:45 curt
1320 // First stab at sunset/sunrise sky glow effects.
1322 // Revision 1.38 1997/12/22 04:14:28 curt
1323 // Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
1325 // Revision 1.37 1997/12/19 23:34:03 curt
1326 // Lot's of tweaking with sky rendering and lighting.
1328 // Revision 1.36 1997/12/19 16:44:57 curt
1329 // Working on scene rendering order and options.
1331 // Revision 1.35 1997/12/18 23:32:32 curt
1332 // First stab at sky dome actually starting to look reasonable. :-)
1334 // Revision 1.34 1997/12/17 23:13:34 curt
1335 // Began working on rendering a sky.
1337 // Revision 1.33 1997/12/15 23:54:45 curt
1338 // Add xgl wrappers for debugging.
1339 // Generate terrain normals on the fly.
1341 // Revision 1.32 1997/12/15 20:59:08 curt
1344 // Revision 1.31 1997/12/12 21:41:25 curt
1345 // More light/material property tweaking ... still a ways off.
1347 // Revision 1.30 1997/12/12 19:52:47 curt
1348 // Working on lightling and material properties.
1350 // Revision 1.29 1997/12/11 04:43:54 curt
1351 // Fixed sun vector and lighting problems. I thing the moon is now lit
1354 // Revision 1.28 1997/12/10 22:37:45 curt
1355 // Prepended "fg" on the name of all global structures that didn't have it yet.
1356 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
1358 // Revision 1.27 1997/12/09 05:11:54 curt
1359 // Working on tweaking lighting.
1361 // Revision 1.26 1997/12/09 04:25:29 curt
1362 // Working on adding a global lighting params structure.
1364 // Revision 1.25 1997/12/08 22:54:09 curt
1365 // Enabled GL_CULL_FACE.
1367 // Revision 1.24 1997/11/25 19:25:32 curt
1368 // Changes to integrate Durk's moon/sun code updates + clean up.
1370 // Revision 1.23 1997/11/15 18:16:34 curt
1373 // Revision 1.22 1997/10/30 12:38:41 curt
1374 // Working on new scenery subsystem.
1376 // Revision 1.21 1997/09/23 00:29:38 curt
1377 // Tweaks to get things to compile with gcc-win32.
1379 // Revision 1.20 1997/09/22 14:44:19 curt
1380 // Continuing to try to align stars correctly.
1382 // Revision 1.19 1997/09/18 16:20:08 curt
1383 // At dusk/dawn add/remove stars in stages.
1385 // Revision 1.18 1997/09/16 22:14:51 curt
1386 // Tweaked time of day lighting equations. Don't draw stars during the day.
1388 // Revision 1.17 1997/09/16 15:50:29 curt
1389 // Working on star alignment and time issues.
1391 // Revision 1.16 1997/09/13 02:00:06 curt
1392 // Mostly working on stars and generating sidereal time for accurate star
1395 // Revision 1.15 1997/09/05 14:17:27 curt
1396 // More tweaking with stars.
1398 // Revision 1.14 1997/09/05 01:35:53 curt
1399 // Working on getting stars right.
1401 // Revision 1.13 1997/09/04 02:17:34 curt
1404 // Revision 1.12 1997/08/27 21:32:24 curt
1405 // Restructured view calculation code. Added stars.
1407 // Revision 1.11 1997/08/27 03:30:16 curt
1408 // Changed naming scheme of basic shared structures.
1410 // Revision 1.10 1997/08/25 20:27:22 curt
1411 // Merged in initial HUD and Joystick code.
1413 // Revision 1.9 1997/08/22 21:34:39 curt
1414 // Doing a bit of reorganizing and house cleaning.
1416 // Revision 1.8 1997/08/19 23:55:03 curt
1417 // Worked on better simulating real lighting.
1419 // Revision 1.7 1997/08/16 12:22:38 curt
1420 // Working on improving the lighting/shading.
1422 // Revision 1.6 1997/08/13 20:24:56 curt
1423 // Changes due to changing sunpos interface.
1425 // Revision 1.5 1997/08/06 21:08:32 curt
1426 // Sun position now really* works (I think) ... I still have sun time warping
1427 // code in place, probably should remove it soon.
1429 // Revision 1.4 1997/08/06 15:41:26 curt
1430 // Working on correct sun position.
1432 // Revision 1.3 1997/08/06 00:24:22 curt
1433 // Working on correct real time sun lighting.
1435 // Revision 1.2 1997/08/04 20:25:15 curt
1436 // Organizational tweaking.
1438 // Revision 1.1 1997/08/02 18:45:00 curt
1439 // Renamed GLmain.c GLUTmain.c
1441 // Revision 1.43 1997/08/02 16:23:47 curt
1444 // Revision 1.42 1997/08/01 19:43:33 curt
1445 // Making progress with coordinate system overhaul.
1447 // Revision 1.41 1997/07/31 22:52:37 curt
1448 // Working on redoing internal coordinate systems & scenery transformations.
1450 // Revision 1.40 1997/07/30 16:12:42 curt
1451 // Moved fg_random routines from Util/ to Math/
1453 // Revision 1.39 1997/07/21 14:45:01 curt
1456 // Revision 1.38 1997/07/19 23:04:47 curt
1457 // Added an initial weather section.
1459 // Revision 1.37 1997/07/19 22:34:02 curt
1460 // Moved PI definitions to ../constants.h
1461 // Moved random() stuff to ../Utils/ and renamed fg_random()
1463 // Revision 1.36 1997/07/18 23:41:25 curt
1464 // Tweaks for building with Cygnus Win32 compiler.
1466 // Revision 1.35 1997/07/18 14:28:34 curt
1467 // Hacked in some support for wind/turbulence.
1469 // Revision 1.34 1997/07/16 20:04:48 curt
1470 // Minor tweaks to aid Win32 port.
1472 // Revision 1.33 1997/07/12 03:50:20 curt
1473 // Added an #include <Windows32/Base.h> to help compiling for Win32
1475 // Revision 1.32 1997/07/11 03:23:18 curt
1476 // Solved some scenery display/orientation problems. Still have a positioning
1477 // (or transformation?) problem.
1479 // Revision 1.31 1997/07/11 01:29:58 curt
1480 // More tweaking of terrian floor.
1482 // Revision 1.30 1997/07/10 04:26:37 curt
1483 // We now can interpolated ground elevation for any position in the grid. We
1484 // can use this to enforce a "hard" ground. We still need to enforce some
1485 // bounds checking so that we don't try to lookup data points outside the
1488 // Revision 1.29 1997/07/09 21:31:12 curt
1489 // Working on making the ground "hard."
1491 // Revision 1.28 1997/07/08 18:20:12 curt
1492 // Working on establishing a hard ground.
1494 // Revision 1.27 1997/07/07 20:59:49 curt
1495 // Working on scenery transformations to enable us to fly fluidly over the
1496 // poles with no discontinuity/distortion in scenery.
1498 // Revision 1.26 1997/07/05 20:43:34 curt
1499 // renamed mat3 directory to Math so we could add other math related routines.
1501 // Revision 1.25 1997/06/29 21:19:17 curt
1502 // Working on scenery management system.
1504 // Revision 1.24 1997/06/26 22:14:53 curt
1505 // Beginning work on a scenery management system.
1507 // Revision 1.23 1997/06/26 19:08:33 curt
1508 // Restructuring make, adding automatic "make dep" support.
1510 // Revision 1.22 1997/06/25 15:39:47 curt
1511 // Minor changes to compile with rsxnt/win32.
1513 // Revision 1.21 1997/06/22 21:44:41 curt
1514 // Working on intergrating the VRML (subset) parser.
1516 // Revision 1.20 1997/06/21 17:12:53 curt
1517 // Capitalized subdirectory names.
1519 // Revision 1.19 1997/06/18 04:10:31 curt
1520 // A couple more runway tweaks ...
1522 // Revision 1.18 1997/06/18 02:21:24 curt
1523 // Hacked in a runway
1525 // Revision 1.17 1997/06/17 16:51:58 curt
1526 // Timer interval stuff now uses gettimeofday() instead of ftime()
1528 // Revision 1.16 1997/06/17 04:19:16 curt
1529 // More timer related tweaks with respect to view direction changes.
1531 // Revision 1.15 1997/06/17 03:41:10 curt
1532 // Nonsignal based interval timing is now working.
1533 // This would be a good time to look at cleaning up the code structure a bit.
1535 // Revision 1.14 1997/06/16 19:32:51 curt
1536 // Starting to add general timer support.
1538 // Revision 1.13 1997/06/02 03:40:06 curt
1539 // A tiny bit more view tweaking.
1541 // Revision 1.12 1997/06/02 03:01:38 curt
1542 // Working on views (side, front, back, transitions, etc.)
1544 // Revision 1.11 1997/05/31 19:16:25 curt
1545 // Elevator trim added.
1547 // Revision 1.10 1997/05/31 04:13:52 curt
1548 // WE CAN NOW FLY!!!
1550 // Continuing work on the LaRCsim flight model integration.
1551 // Added some MSFS-like keyboard input handling.
1553 // Revision 1.9 1997/05/30 19:27:01 curt
1554 // The LaRCsim flight model is starting to look like it is working.
1556 // Revision 1.8 1997/05/30 03:54:10 curt
1557 // Made a bit more progress towards integrating the LaRCsim flight model.
1559 // Revision 1.7 1997/05/29 22:39:49 curt
1560 // Working on incorporating the LaRCsim flight model.
1562 // Revision 1.6 1997/05/29 12:31:39 curt
1563 // Minor tweaks, moving towards general flight model integration.
1565 // Revision 1.5 1997/05/29 02:33:23 curt
1566 // Updated to reflect changing interfaces in other "modules."
1568 // Revision 1.4 1997/05/27 17:44:31 curt
1569 // Renamed & rearranged variables and routines. Added some initial simple
1570 // timer/alarm routines so the flight model can be updated on a regular
1573 // Revision 1.3 1997/05/23 15:40:25 curt
1574 // Added GNU copyright headers.
1577 // Revision 1.2 1997/05/23 00:35:12 curt
1578 // Trying to get fog to work ...
1580 // Revision 1.1 1997/05/21 15:57:51 curt
1581 // Renamed due to added GLUT support.
1583 // Revision 1.3 1997/05/19 18:22:42 curt
1584 // Parameter tweaking ... starting to stub in fog support.
1586 // Revision 1.2 1997/05/17 00:17:34 curt
1587 // Trying to stub in support for standard OpenGL.
1589 // Revision 1.1 1997/05/16 16:05:52 curt
1590 // Initial revision.