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 HAVE_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.h>
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 HAVE_AUDIO_SUPPORT
102 slScheduler audio_sched ( 8000 );
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 ) {
136 l = &cur_light_params;
137 o = ¤t_options;
138 w = ¤t_weather;
140 // Go full screen if requested ...
141 if ( o->fullscreen ) {
145 // If enabled, normal vectors specified with glNormal are scaled
146 // to unit length after transformation. See glNormal.
147 xglEnable( GL_NORMALIZE );
149 xglEnable( GL_LIGHTING );
150 xglEnable( GL_LIGHT0 );
151 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
153 // xglFogi (GL_FOG_MODE, GL_LINEAR);
154 xglFogi (GL_FOG_MODE, GL_EXP2);
155 // Fog density is now set when the weather system is initialized
156 // xglFogf (GL_FOG_DENSITY, w->fog_density);
157 if ( (o->fog == 1) || (o->shading == 0) ) {
158 // if fastest fog requested, or if flat shading force fastest
159 xglHint (GL_FOG_HINT, GL_FASTEST );
160 } else if ( o->fog == 2 ) {
161 xglHint (GL_FOG_HINT, GL_NICEST );
163 if ( o->wireframe ) {
165 xglPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
168 // This is the default anyways, but it can't hurt
169 xglFrontFace ( GL_CCW );
173 // Update the view volume, position, and orientation
174 static void fgUpdateViewParams( void ) {
180 f = current_aircraft.flight;
181 l = &cur_light_params;
182 o = ¤t_options;
186 v->UpdateWorldToEye(f);
188 // if (!o->panel_status) {
189 // xglViewport( 0, (GLint)((v->winHeight) / 2 ) ,
190 // (GLint)(v->winWidth), (GLint)(v->winHeight) / 2 );
191 // Tell GL we are about to modify the projection parameters
192 // xglMatrixMode(GL_PROJECTION);
193 // xglLoadIdentity();
194 // gluPerspective(o->fov, v->win_ratio / 2.0, 1.0, 100000.0);
196 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) );
197 // Tell GL we are about to modify the projection parameters
198 xglMatrixMode(GL_PROJECTION);
200 gluPerspective(o->fov, v->win_ratio, 10.0, 100000.0);
203 xglMatrixMode(GL_MODELVIEW);
206 // set up our view volume (default)
207 fg_gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
208 v->view_pos.x + v->view_forward[0],
209 v->view_pos.y + v->view_forward[1],
210 v->view_pos.z + v->view_forward[2],
211 v->view_up[0], v->view_up[1], v->view_up[2]);
213 // look almost straight up (testing and eclipse watching)
214 /* fg_gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
215 v->view_pos.x + v->view_up[0] + .001,
216 v->view_pos.y + v->view_up[1] + .001,
217 v->view_pos.z + v->view_up[2] + .001,
218 v->view_up[0], v->view_up[1], v->view_up[2]); */
220 // lock view horizontally towards sun (testing)
221 /* fg_gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
222 v->view_pos.x + v->surface_to_sun[0],
223 v->view_pos.y + v->surface_to_sun[1],
224 v->view_pos.z + v->surface_to_sun[2],
225 v->view_up[0], v->view_up[1], v->view_up[2]); */
227 // lock view horizontally towards south (testing)
228 /* fg_gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
229 v->view_pos.x + v->surface_south[0],
230 v->view_pos.y + v->surface_south[1],
231 v->view_pos.z + v->surface_south[2],
232 v->view_up[0], v->view_up[1], v->view_up[2]); */
234 // set the sun position
235 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
240 // Draw a basic instrument panel
241 static void fgUpdateInstrViewParams( void ) {
249 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) / 2);
251 xglMatrixMode(GL_PROJECTION);
255 gluOrtho2D(0, 640, 0, 480);
256 xglMatrixMode(GL_MODELVIEW);
260 xglColor3f(1.0, 1.0, 1.0);
263 xglDisable(GL_DEPTH_TEST);
264 xglDisable(GL_LIGHTING);
267 xglColor3f (0.5, 0.5, 0.5);
270 xglVertex2f(0.0, 0.00);
271 xglVertex2f(0.0, 480.0);
272 xglVertex2f(640.0,480.0);
273 xglVertex2f(640.0, 0.0);
276 xglRectf(0.0,0.0, 640, 480);
277 xglEnable(GL_DEPTH_TEST);
278 xglEnable(GL_LIGHTING);
279 xglMatrixMode(GL_PROJECTION);
281 xglMatrixMode(GL_MODELVIEW);
287 // Update all Visuals (redraws anything graphics related)
288 static void fgRenderFrame( void ) {
294 GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
295 GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
296 GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
298 l = &cur_light_params;
299 o = ¤t_options;
300 t = &cur_time_params;
303 if ( idle_state != 1000 ) {
304 // still initializing, draw the splash screen
307 // idle_state is now 1000 meaning we've finished all our
308 // initializations and are running the main loop, so this will
309 // now work without seg faulting the system.
311 // this is just a temporary hack, to make me understand Pui
312 timerText -> setLabel (ctime (&t->cur_time));
315 // update view volume parameters
316 fgUpdateViewParams();
319 glClearColor(black[0], black[1], black[2], black[3]);
320 xglClear( GL_DEPTH_BUFFER_BIT );
322 glClearColor(l->sky_color[0], l->sky_color[1],
323 l->sky_color[2], l->sky_color[3]);
324 xglClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
327 // Tell GL we are switching to model view parameters
328 xglMatrixMode(GL_MODELVIEW);
329 // xglLoadIdentity();
332 xglDisable( GL_DEPTH_TEST );
333 xglDisable( GL_LIGHTING );
334 xglDisable( GL_CULL_FACE );
335 xglDisable( GL_FOG );
336 xglShadeModel( GL_SMOOTH );
341 // setup transformation for drawing astronomical objects
343 // Translate to view position
344 xglTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
345 // Rotate based on gst (sidereal time)
346 // note: constant should be 15.041085, Curt thought it was 15
347 angle = t->gst * 15.041085;
348 // printf("Rotating astro objects by %.2f degrees\n",angle);
349 xglRotatef( angle, 0.0, 0.0, -1.0 );
351 // draw stars and planets
359 xglEnable( GL_LIGHTING );
360 // set lighting parameters
361 xglLightfv(GL_LIGHT0, GL_AMBIENT, white );
362 xglLightfv(GL_LIGHT0, GL_DIFFUSE, white );
363 xglEnable( GL_CULL_FACE );
365 // Let's try some blending technique's (Durk)
367 glBlendFunc(GL_ONE, GL_ONE);
375 xglShadeModel( GL_SMOOTH );
377 xglShadeModel( GL_FLAT );
379 xglEnable( GL_DEPTH_TEST );
382 xglFogfv (GL_FOG_COLOR, l->fog_color);
384 // set lighting parameters
385 xglLightfv(GL_LIGHT0, GL_AMBIENT, l->scene_ambient );
386 xglLightfv(GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
389 // texture parameters
390 xglEnable( GL_TEXTURE_2D );
391 // set base color (I don't think this is doing anything here)
392 xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
393 xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
395 xglDisable( GL_TEXTURE_2D );
396 xglMaterialfv (GL_FRONT, GL_AMBIENT, terrain_color);
397 xglMaterialfv (GL_FRONT, GL_DIFFUSE, terrain_color);
398 // xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
399 // xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
404 xglDisable( GL_TEXTURE_2D );
406 // display HUD && Panel
409 // display instruments
410 // if (!o->panel_status) {
411 // fgUpdateInstrViewParams();
420 // Update internal time dependent calculations (i.e. flight model)
421 void fgUpdateTimeDepCalcs(int multi_loop) {
427 f = current_aircraft.flight;
428 t = &cur_time_params;
431 // update the flight model
432 if ( multi_loop < 0 ) {
433 multi_loop = DEFAULT_MULTILOOP;
436 // printf("updating flight model x %d\n", multi_loop);
437 fgFlightModelUpdate(FG_LARCSIM, f, multi_loop);
439 // update the view angle
440 for ( i = 0; i < multi_loop; i++ ) {
441 if ( fabs(v->goal_view_offset - v->view_offset) < 0.05 ) {
442 v->view_offset = v->goal_view_offset;
445 // move v->view_offset towards v->goal_view_offset
446 if ( v->goal_view_offset > v->view_offset ) {
447 if ( v->goal_view_offset - v->view_offset < FG_PI ) {
448 v->view_offset += 0.01;
450 v->view_offset -= 0.01;
453 if ( v->view_offset - v->goal_view_offset < FG_PI ) {
454 v->view_offset -= 0.01;
456 v->view_offset += 0.01;
459 if ( v->view_offset > FG_2PI ) {
460 v->view_offset -= FG_2PI;
461 } else if ( v->view_offset < 0 ) {
462 v->view_offset += FG_2PI;
469 void fgInitTimeDepCalcs( void ) {
472 #ifdef HAVE_SETITIMER
473 fgTimerInit( 1.0 / DEFAULT_TIMER_HZ, fgUpdateTimeDepCalcs );
474 #endif HAVE_SETITIMER
479 // What should we do when we have nothing else to do? Let's get ready
480 // for the next move and update the display?
481 static void fgMainLoop( void ) {
486 static int remainder = 0;
487 int elapsed, multi_loop;
491 // double joy_x, joy_y;
492 // int joy_b1, joy_b2;
494 a = ¤t_aircraft;
497 t = &cur_time_params;
499 fgPrintf( FG_ALL, FG_DEBUG, "Running Main Loop\n");
500 fgPrintf( FG_ALL, FG_DEBUG, "======= ==== ====\n");
506 /* fgJoystickRead( &joy_x, &joy_y, &joy_b1, &joy_b2 );
507 printf( "Joystick X %f Y %f B1 %d B2 %d\n",
508 joy_x, joy_y, joy_b1, joy_b2 );
510 fgAileronSet( joy_x ); */
512 // Get elapsed time for this past frame
513 elapsed = fgGetTimeInterval();
514 fgPrintf( FG_ALL, FG_BULK,
515 "Time interval is = %d, previous remainder is = %d\n",
518 // Calculate frame rate average
519 if ( elapsed > 0.0 ) {
521 for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
522 accum += g->frames[i];
523 // printf("frame[%d] = %.2f\n", i, g->frames[i]);
524 g->frames[i+1] = g->frames[i];
526 g->frames[0] = 1000.0 / (float)elapsed;
527 // printf("frame[0] = %.2f\n", g->frames[0]);
528 accum += g->frames[0];
529 g->frame_rate = accum / (float)FG_FRAME_RATE_HISTORY;
530 // printf("ave = %.2f\n", g->frame_rate);
533 // Calculate model iterations needed for next frame
534 fgPrintf( FG_ALL, FG_DEBUG,
535 "--> Frame rate is = %.2f\n", g->frame_rate);
536 elapsed += remainder;
538 multi_loop = (int)(((float)elapsed * 0.001) * DEFAULT_MODEL_HZ);
539 remainder = elapsed - ((multi_loop*1000) / DEFAULT_MODEL_HZ);
540 fgPrintf( FG_ALL, FG_BULK,
541 "Model iterations needed = %d, new remainder = %d\n",
542 multi_loop, remainder);
545 if ( ! use_signals ) {
547 fgUpdateTimeDepCalcs(multi_loop);
550 // I'm just sticking this here for now, it should probably move
552 /* cur_elev = mesh_altitude(FG_Longitude * RAD_TO_ARCSEC,
553 FG_Latitude * RAD_TO_ARCSEC); */
554 // there is no ground collision detection really, so for now I
555 // just hard code the ground elevation to be 0 */
558 // printf("Ground elevation is %.2f meters here.\n", cur_elev);
559 // FG_Runway_altitude = cur_elev * METER_TO_FEET;
561 if ( FG_Altitude * FEET_TO_METER < cur_elev + 3.758099) {
562 // set this here, otherwise if we set runway height above our
563 // current height we get a really nasty bounce.
564 FG_Runway_altitude = FG_Altitude - 3.758099;
566 // now set aircraft altitude above ground
567 FG_Altitude = cur_elev * METER_TO_FEET + 3.758099;
568 fgPrintf( FG_ALL, FG_BULK, "<*> resetting altitude to %.0f meters\n",
569 FG_Altitude * FEET_TO_METER);
572 fgAircraftOutputCurrent(a);
574 // see if we need to load any new scenery tiles
577 // Process/manage pending events
578 global_events.Process();
580 // Run audio scheduler
581 #ifdef HAVE_AUDIO_SUPPORT
582 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 ) {
603 char path[256], mp3file[256], command[256], slfile[256];
604 static char *lockfile = "/tmp/mpg123.running";
607 o = ¤t_options;
609 // printf("idle state == %d\n", idle_state);
611 if ( idle_state == 0 ) {
612 // Initialize the splash screen right away
616 } else if ( idle_state == 1 ) {
617 // Start the intro music
619 strcpy(mp3file, o->fg_root);
620 strcat(mp3file, "/Sounds/");
621 strcat(mp3file, "intro.mp3");
623 "(touch %s; ampg123 %s > /dev/null 2>&1; /bin/rm %s) &",
624 lockfile, mp3file, lockfile );
625 fgPrintf( FG_GENERAL, FG_INFO,
626 "Starting intro music: %s\n", mp3file);
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.
634 if( !fgInitGeneral()) {
635 fgPrintf( FG_GENERAL, FG_EXIT,
636 "General initializations failed ...\n" );
639 if ( strstr ( g->glRenderer, "Glide" ) ) {
640 grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
645 } else if ( idle_state == 3 ) {
646 // This is the top level init routine which calls all the
647 // other subsystem initialization routines. If you are adding
648 // a subsystem to flight gear, its initialization call should
649 // located in this routine.
650 if( !fgInitSubsystems()) {
651 fgPrintf( FG_GENERAL, FG_EXIT,
652 "Subsystem initializations failed ...\n" );
656 } else if ( idle_state == 4 ) {
657 // setup OpenGL view parameters
661 // init timer routines, signals, etc. Arrange for an alarm
662 // signal to be generated, etc.
663 fgInitTimeDepCalcs();
667 } else if ( idle_state == 5 ) {
668 //Init the user interface
672 } else if ( idle_state == 6 ) {
673 // Initialize audio support
674 #ifdef HAVE_AUDIO_SUPPORT
677 // Let's wait for mpg123 to finish
678 struct stat stat_buf;
680 fgPrintf( FG_GENERAL, FG_INFO,
681 "Waiting for mpg123 player to finish " );
682 while ( stat(lockfile, &stat_buf) == 0 ) {
683 // file exist, wait ...
685 fgPrintf( FG_GENERAL, FG_INFO, ".");
687 fgPrintf( FG_GENERAL, FG_INFO, "\n");
690 // audio_sched = new slScheduler ( 8000 );
691 // audio_mixer = new smMixer;
692 audio_mixer . setMasterVolume ( 30 ) ; /* 50% of max volume. */
693 audio_sched . setSafetyMargin ( 1.0 ) ;
694 strcpy(path, o->fg_root);
695 strcat(path, "/Sounds/");
697 strcpy(slfile, path);
698 strcat(slfile, "prpidle.wav");
699 // s1 = new slSample ( slfile );
700 s1 = new slSample ( "/dos/X-System-HSR/sounds/xp_recip.wav",
702 printf("Rate = %d Bps = %d Stereo = %d\n",
703 s1 -> getRate(), s1 -> getBps(), s1 -> getStereo());
704 audio_sched . loopSample ( s1 );
706 // strcpy(slfile, path);
707 // strcat(slfile, "thunder.wav");
708 // s2 -> loadFile ( slfile );
709 // s2 -> adjustVolume(0.5);
710 // audio_sched -> playSample ( s2 );
717 if ( idle_state == 1000 ) {
718 // We've finished all our initialization steps, from now on we
719 // run the main loop.
728 // Handle new window size or exposure
729 static void fgReshape( int width, int height ) {
734 // Do this so we can call fgReshape(0,0) ourselves without having
735 // to know what the values of width & height are.
736 if ( (height > 0) && (width > 0) ) {
737 v->win_ratio = (GLfloat) width / (GLfloat) height;
741 v->winHeight = height;
743 // Inform gl of our view window size (now handled elsewhere)
744 // xglViewport(0, 0, (GLint)width, (GLint)height);
745 if ( idle_state == 1000 ) {
746 // yes we've finished all our initializations and are running
747 // the main loop, so this will now work without seg faulting
749 fgUpdateViewParams();
752 // xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
756 // Initialize GLUT and define a main window
757 int fgGlutInit( int *argc, char **argv ) {
758 // GLUT will extract all glut specific options so later on we only
759 // need wory about our own.
760 xglutInit(argc, argv);
762 // Define Display Parameters
763 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
765 // Define initial window size
766 xglutInitWindowSize(640, 480);
768 // Initialize windows
769 xglutCreateWindow("Flight Gear");
775 // Initialize GLUT event handlers
776 int fgGlutInitEvents( void ) {
777 // call fgReshape() on window resizes
778 xglutReshapeFunc( fgReshape );
780 // call GLUTkey() on keyboard event
781 xglutKeyboardFunc( GLUTkey );
782 glutSpecialFunc( GLUTspecialkey );
784 // call guiMouseFunc() whenever our little rodent is used
785 glutMouseFunc ( guiMouseFunc );
786 glutMotionFunc (guiMotionFunc );
787 glutPassiveMotionFunc (guiMotionFunc );
789 // call fgMainLoop() whenever there is
790 // nothing else to do
791 xglutIdleFunc( fgIdleFunction );
794 xglutDisplayFunc( fgRenderFrame );
801 int main( int argc, char **argv ) {
805 int result; // Used in command line argument.
807 f = current_aircraft.flight;
808 o = ¤t_options;
811 _control87(MCW_EM, MCW_EM); /* defined in float.h */
814 // Initialize the debugging output system
817 fgPrintf(FG_GENERAL, FG_INFO, "Flight Gear: Version %s\n\n", VERSION);
819 // Initialize the Window/Graphics environment.
820 if( !fgGlutInit(&argc, argv) ) {
821 fgPrintf( FG_GENERAL, FG_EXIT, "GLUT initialization failed ...\n" );
824 // Initialize the various GLUT Event Handlers.
825 if( !fgGlutInitEvents() ) {
826 fgPrintf( FG_GENERAL, FG_EXIT,
827 "GLUT event handler initialization failed ...\n" );
830 // Attempt to locate and parse a config file
831 // First check fg_root
832 strcpy(config, o->fg_root);
833 strcat(config, "/system.fgfsrc");
834 result = o->parse_config_file(config);
836 // Next check home directory
837 if ( getenv("HOME") != NULL ) {
838 strcpy(config, getenv("HOME"));
839 strcat(config, "/.fgfsrc");
840 result = o->parse_config_file(config);
843 // Parse remaining command line options
844 // These will override anything specified in a config file
845 result = o->parse_command_line(argc, argv);
846 if ( result != FG_OPTIONS_OK ) {
847 // Something must have gone horribly wrong with the command
848 // line parsing or maybe the user just requested help ... :-)
850 fgPrintf( FG_GENERAL, FG_EXIT, "\nExiting ...\n");
853 // pass control off to the master GLUT event handler
856 // we never actually get here ... but just in case ... :-)
862 // Revision 1.30 1998/07/06 02:42:03 curt
863 // Added support for switching between fullscreen and window mode for
866 // Added a basic splash screen. Restructured the main loop and top level
867 // initialization routines to do this.
869 // Hacked in some support for playing a startup mp3 sound file while rest
870 // of sim initializes. Currently only works in Unix using the mpg123 player.
871 // Waits for the mpg123 player to finish before initializing internal
874 // Revision 1.29 1998/07/04 00:52:22 curt
875 // Add my own version of gluLookAt() (which is nearly identical to the
876 // Mesa/glu version.) But, by calculating the Model View matrix our selves
877 // we can save this matrix without having to read it back in from the video
878 // card. This hopefully allows us to save a few cpu cycles when rendering
879 // out the fragments because we can just use glLoadMatrixd() with the
880 // precalculated matrix for each tile rather than doing a push(), translate(),
881 // pop() for every fragment.
883 // Panel status defaults to off for now until it gets a bit more developed.
885 // Extract OpenGL driver info on initialization.
887 // Revision 1.28 1998/06/27 16:54:32 curt
888 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
889 // Don't change the view port when displaying the panel.
891 // Revision 1.27 1998/06/17 21:35:10 curt
892 // Refined conditional audio support compilation.
893 // Moved texture parameter setup calls to ../Scenery/materials.cxx
894 // #include <string.h> before various STL includes.
895 // Make HUD default state be enabled.
897 // Revision 1.26 1998/06/13 00:40:32 curt
898 // Tweaked fog command line options.
900 // Revision 1.25 1998/06/12 14:27:26 curt
901 // Pui -> PUI, Gui -> GUI.
903 // Revision 1.24 1998/06/12 00:57:39 curt
904 // Added support for Pui/Gui.
905 // Converted fog to GL_FOG_EXP2.
906 // Link to static simulator parts.
907 // Update runfg.bat to try to be a little smarter.
909 // Revision 1.23 1998/06/08 17:57:04 curt
910 // Minor sound/startup position tweaks.
912 // Revision 1.22 1998/06/05 18:18:40 curt
913 // A bit of fiddling with audio ...
915 // Revision 1.21 1998/06/03 22:01:06 curt
916 // Tweaking sound library usage.
918 // Revision 1.20 1998/06/03 00:47:11 curt
919 // Updated to compile in audio support if OSS available.
920 // Updated for new version of Steve's audio library.
921 // STL includes don't use .h
922 // Small view optimizations.
924 // Revision 1.19 1998/06/01 17:54:40 curt
925 // Added Linux audio support.
926 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
929 // Revision 1.18 1998/05/29 20:37:19 curt
930 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
931 // Read airport list into a "map" STL for dynamic list sizing and fast tree
934 // Revision 1.17 1998/05/22 21:28:52 curt
935 // Modifications to use the new fgEVENT_MGR class.
937 // Revision 1.16 1998/05/20 20:51:33 curt
938 // Tweaked smooth shaded texture lighting properties.
939 // Converted fgLIGHT to a C++ class.
941 // Revision 1.15 1998/05/16 13:08:34 curt
942 // C++ - ified views.[ch]xx
943 // Shuffled some additional view parameters into the fgVIEW class.
944 // Changed tile-radius to tile-diameter because it is a much better
946 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
947 // to transform world space to eye space for view frustum culling.
949 // Revision 1.14 1998/05/13 18:29:57 curt
950 // Added a keyboard binding to dynamically adjust field of view.
951 // Added a command line option to specify fov.
952 // Adjusted terrain color.
953 // Root path info moved to fgOPTIONS.
954 // Added ability to parse options out of a config file.
956 // Revision 1.13 1998/05/11 18:18:15 curt
957 // For flat shading use "glHint (GL_FOG_HINT, GL_FASTEST )"
959 // Revision 1.12 1998/05/07 23:14:15 curt
960 // Added "D" key binding to set autopilot heading.
961 // Made frame rate calculation average out over last 10 frames.
962 // Borland C++ floating point exception workaround.
963 // Added a --tile-radius=n option.
965 // Revision 1.11 1998/05/06 03:16:23 curt
966 // Added an averaged global frame rate counter.
967 // Added an option to control tile radius.
969 // Revision 1.10 1998/05/03 00:47:31 curt
970 // Added an option to enable/disable full-screen mode.
972 // Revision 1.9 1998/04/30 12:34:17 curt
973 // Added command line rendering options:
974 // enable/disable fog/haze
975 // specify smooth/flat shading
976 // disable sky blending and just use a solid color
977 // enable wireframe drawing mode
979 // Revision 1.8 1998/04/28 01:20:21 curt
980 // Type-ified fgTIME and fgVIEW.
981 // Added a command line option to disable textures.
983 // Revision 1.7 1998/04/26 05:10:02 curt
984 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
986 // Revision 1.6 1998/04/25 22:06:30 curt
987 // Edited cvs log messages in source files ... bad bad bad!
989 // Revision 1.5 1998/04/25 20:24:01 curt
990 // Cleaned up initialization sequence to eliminate interdependencies
991 // between sun position, lighting, and view position. This creates a
992 // valid single pass initialization path.
994 // Revision 1.4 1998/04/24 14:19:30 curt
997 // Revision 1.3 1998/04/24 00:49:18 curt
998 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
999 // Trying out some different option parsing code.
1000 // Some code reorganization.
1002 // Revision 1.2 1998/04/22 13:25:41 curt
1003 // C++ - ifing the code.
1004 // Starting a bit of reorganization of lighting code.
1006 // Revision 1.1 1998/04/21 17:02:39 curt
1007 // Prepairing for C++ integration.
1009 // Revision 1.71 1998/04/18 04:11:26 curt
1010 // Moved fg_debug to it's own library, added zlib support.
1012 // Revision 1.70 1998/04/14 02:21:02 curt
1013 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
1014 // <jgoeke@voyager.net>
1016 // Revision 1.69 1998/04/08 23:35:34 curt
1017 // Tweaks to Gnu automake/autoconf system.
1019 // Revision 1.68 1998/04/03 22:09:03 curt
1020 // Converting to Gnu autoconf system.
1022 // Revision 1.67 1998/03/23 21:24:37 curt
1023 // Source code formating tweaks.
1025 // Revision 1.66 1998/03/14 00:31:20 curt
1026 // Beginning initial terrain texturing experiments.
1028 // Revision 1.65 1998/03/09 22:45:57 curt
1029 // Minor tweaks for building on sparc platform.
1031 // Revision 1.64 1998/02/20 00:16:23 curt
1032 // Thursday's tweaks.
1034 // Revision 1.63 1998/02/16 16:17:39 curt
1037 // Revision 1.62 1998/02/16 13:39:42 curt
1038 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
1039 // tiles to occasionally be missing.
1041 // Revision 1.61 1998/02/12 21:59:46 curt
1042 // Incorporated code changes contributed by Charlie Hotchkiss
1043 // <chotchkiss@namg.us.anritsu.com>
1045 // Revision 1.60 1998/02/11 02:50:40 curt
1048 // Revision 1.59 1998/02/09 22:56:54 curt
1049 // Removed "depend" files from cvs control. Other minor make tweaks.
1051 // Revision 1.58 1998/02/09 15:07:49 curt
1054 // Revision 1.57 1998/02/07 15:29:40 curt
1055 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
1056 // <chotchkiss@namg.us.anritsu.com>
1058 // Revision 1.56 1998/02/03 23:20:23 curt
1059 // Lots of little tweaks to fix various consistency problems discovered by
1060 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
1061 // passed arguments along to the real printf(). Also incorporated HUD changes
1062 // by Michele America.
1064 // Revision 1.55 1998/02/02 20:53:58 curt
1065 // Incorporated Durk's changes.
1067 // Revision 1.54 1998/01/31 00:43:10 curt
1068 // Added MetroWorks patches from Carmen Volpe.
1070 // Revision 1.53 1998/01/27 18:35:54 curt
1073 // Revision 1.52 1998/01/27 00:47:56 curt
1074 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
1075 // system and commandline/config file processing code.
1077 // Revision 1.51 1998/01/26 15:57:05 curt
1078 // Tweaks for dynamic scenery development.
1080 // Revision 1.50 1998/01/19 19:27:07 curt
1081 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
1082 // This should simplify things tremendously.
1084 // Revision 1.49 1998/01/19 18:40:31 curt
1085 // Tons of little changes to clean up the code and to remove fatal errors
1086 // when building with the c++ compiler.
1088 // Revision 1.48 1998/01/19 18:35:46 curt
1089 // Minor tweaks and fixes for cygwin32.
1091 // Revision 1.47 1998/01/13 00:23:08 curt
1092 // Initial changes to support loading and management of scenery tiles. Note,
1093 // there's still a fair amount of work left to be done.
1095 // Revision 1.46 1998/01/08 02:22:06 curt
1096 // Beginning to integrate Tile management subsystem.
1098 // Revision 1.45 1998/01/07 03:18:55 curt
1099 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
1101 // Revision 1.44 1997/12/30 22:22:31 curt
1102 // Further integration of event manager.
1104 // Revision 1.43 1997/12/30 20:47:43 curt
1105 // Integrated new event manager with subsystem initializations.
1107 // Revision 1.42 1997/12/30 16:36:47 curt
1108 // Merged in Durk's changes ...
1110 // Revision 1.41 1997/12/30 13:06:56 curt
1111 // A couple lighting tweaks ...
1113 // Revision 1.40 1997/12/30 01:38:37 curt
1114 // Switched back to per vertex normals and smooth shading for terrain.
1116 // Revision 1.39 1997/12/22 23:45:45 curt
1117 // First stab at sunset/sunrise sky glow effects.
1119 // Revision 1.38 1997/12/22 04:14:28 curt
1120 // Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
1122 // Revision 1.37 1997/12/19 23:34:03 curt
1123 // Lot's of tweaking with sky rendering and lighting.
1125 // Revision 1.36 1997/12/19 16:44:57 curt
1126 // Working on scene rendering order and options.
1128 // Revision 1.35 1997/12/18 23:32:32 curt
1129 // First stab at sky dome actually starting to look reasonable. :-)
1131 // Revision 1.34 1997/12/17 23:13:34 curt
1132 // Began working on rendering a sky.
1134 // Revision 1.33 1997/12/15 23:54:45 curt
1135 // Add xgl wrappers for debugging.
1136 // Generate terrain normals on the fly.
1138 // Revision 1.32 1997/12/15 20:59:08 curt
1141 // Revision 1.31 1997/12/12 21:41:25 curt
1142 // More light/material property tweaking ... still a ways off.
1144 // Revision 1.30 1997/12/12 19:52:47 curt
1145 // Working on lightling and material properties.
1147 // Revision 1.29 1997/12/11 04:43:54 curt
1148 // Fixed sun vector and lighting problems. I thing the moon is now lit
1151 // Revision 1.28 1997/12/10 22:37:45 curt
1152 // Prepended "fg" on the name of all global structures that didn't have it yet.
1153 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
1155 // Revision 1.27 1997/12/09 05:11:54 curt
1156 // Working on tweaking lighting.
1158 // Revision 1.26 1997/12/09 04:25:29 curt
1159 // Working on adding a global lighting params structure.
1161 // Revision 1.25 1997/12/08 22:54:09 curt
1162 // Enabled GL_CULL_FACE.
1164 // Revision 1.24 1997/11/25 19:25:32 curt
1165 // Changes to integrate Durk's moon/sun code updates + clean up.
1167 // Revision 1.23 1997/11/15 18:16:34 curt
1170 // Revision 1.22 1997/10/30 12:38:41 curt
1171 // Working on new scenery subsystem.
1173 // Revision 1.21 1997/09/23 00:29:38 curt
1174 // Tweaks to get things to compile with gcc-win32.
1176 // Revision 1.20 1997/09/22 14:44:19 curt
1177 // Continuing to try to align stars correctly.
1179 // Revision 1.19 1997/09/18 16:20:08 curt
1180 // At dusk/dawn add/remove stars in stages.
1182 // Revision 1.18 1997/09/16 22:14:51 curt
1183 // Tweaked time of day lighting equations. Don't draw stars during the day.
1185 // Revision 1.17 1997/09/16 15:50:29 curt
1186 // Working on star alignment and time issues.
1188 // Revision 1.16 1997/09/13 02:00:06 curt
1189 // Mostly working on stars and generating sidereal time for accurate star
1192 // Revision 1.15 1997/09/05 14:17:27 curt
1193 // More tweaking with stars.
1195 // Revision 1.14 1997/09/05 01:35:53 curt
1196 // Working on getting stars right.
1198 // Revision 1.13 1997/09/04 02:17:34 curt
1201 // Revision 1.12 1997/08/27 21:32:24 curt
1202 // Restructured view calculation code. Added stars.
1204 // Revision 1.11 1997/08/27 03:30:16 curt
1205 // Changed naming scheme of basic shared structures.
1207 // Revision 1.10 1997/08/25 20:27:22 curt
1208 // Merged in initial HUD and Joystick code.
1210 // Revision 1.9 1997/08/22 21:34:39 curt
1211 // Doing a bit of reorganizing and house cleaning.
1213 // Revision 1.8 1997/08/19 23:55:03 curt
1214 // Worked on better simulating real lighting.
1216 // Revision 1.7 1997/08/16 12:22:38 curt
1217 // Working on improving the lighting/shading.
1219 // Revision 1.6 1997/08/13 20:24:56 curt
1220 // Changes due to changing sunpos interface.
1222 // Revision 1.5 1997/08/06 21:08:32 curt
1223 // Sun position now really* works (I think) ... I still have sun time warping
1224 // code in place, probably should remove it soon.
1226 // Revision 1.4 1997/08/06 15:41:26 curt
1227 // Working on correct sun position.
1229 // Revision 1.3 1997/08/06 00:24:22 curt
1230 // Working on correct real time sun lighting.
1232 // Revision 1.2 1997/08/04 20:25:15 curt
1233 // Organizational tweaking.
1235 // Revision 1.1 1997/08/02 18:45:00 curt
1236 // Renamed GLmain.c GLUTmain.c
1238 // Revision 1.43 1997/08/02 16:23:47 curt
1241 // Revision 1.42 1997/08/01 19:43:33 curt
1242 // Making progress with coordinate system overhaul.
1244 // Revision 1.41 1997/07/31 22:52:37 curt
1245 // Working on redoing internal coordinate systems & scenery transformations.
1247 // Revision 1.40 1997/07/30 16:12:42 curt
1248 // Moved fg_random routines from Util/ to Math/
1250 // Revision 1.39 1997/07/21 14:45:01 curt
1253 // Revision 1.38 1997/07/19 23:04:47 curt
1254 // Added an initial weather section.
1256 // Revision 1.37 1997/07/19 22:34:02 curt
1257 // Moved PI definitions to ../constants.h
1258 // Moved random() stuff to ../Utils/ and renamed fg_random()
1260 // Revision 1.36 1997/07/18 23:41:25 curt
1261 // Tweaks for building with Cygnus Win32 compiler.
1263 // Revision 1.35 1997/07/18 14:28:34 curt
1264 // Hacked in some support for wind/turbulence.
1266 // Revision 1.34 1997/07/16 20:04:48 curt
1267 // Minor tweaks to aid Win32 port.
1269 // Revision 1.33 1997/07/12 03:50:20 curt
1270 // Added an #include <Windows32/Base.h> to help compiling for Win32
1272 // Revision 1.32 1997/07/11 03:23:18 curt
1273 // Solved some scenery display/orientation problems. Still have a positioning
1274 // (or transformation?) problem.
1276 // Revision 1.31 1997/07/11 01:29:58 curt
1277 // More tweaking of terrian floor.
1279 // Revision 1.30 1997/07/10 04:26:37 curt
1280 // We now can interpolated ground elevation for any position in the grid. We
1281 // can use this to enforce a "hard" ground. We still need to enforce some
1282 // bounds checking so that we don't try to lookup data points outside the
1285 // Revision 1.29 1997/07/09 21:31:12 curt
1286 // Working on making the ground "hard."
1288 // Revision 1.28 1997/07/08 18:20:12 curt
1289 // Working on establishing a hard ground.
1291 // Revision 1.27 1997/07/07 20:59:49 curt
1292 // Working on scenery transformations to enable us to fly fluidly over the
1293 // poles with no discontinuity/distortion in scenery.
1295 // Revision 1.26 1997/07/05 20:43:34 curt
1296 // renamed mat3 directory to Math so we could add other math related routines.
1298 // Revision 1.25 1997/06/29 21:19:17 curt
1299 // Working on scenery management system.
1301 // Revision 1.24 1997/06/26 22:14:53 curt
1302 // Beginning work on a scenery management system.
1304 // Revision 1.23 1997/06/26 19:08:33 curt
1305 // Restructuring make, adding automatic "make dep" support.
1307 // Revision 1.22 1997/06/25 15:39:47 curt
1308 // Minor changes to compile with rsxnt/win32.
1310 // Revision 1.21 1997/06/22 21:44:41 curt
1311 // Working on intergrating the VRML (subset) parser.
1313 // Revision 1.20 1997/06/21 17:12:53 curt
1314 // Capitalized subdirectory names.
1316 // Revision 1.19 1997/06/18 04:10:31 curt
1317 // A couple more runway tweaks ...
1319 // Revision 1.18 1997/06/18 02:21:24 curt
1320 // Hacked in a runway
1322 // Revision 1.17 1997/06/17 16:51:58 curt
1323 // Timer interval stuff now uses gettimeofday() instead of ftime()
1325 // Revision 1.16 1997/06/17 04:19:16 curt
1326 // More timer related tweaks with respect to view direction changes.
1328 // Revision 1.15 1997/06/17 03:41:10 curt
1329 // Nonsignal based interval timing is now working.
1330 // This would be a good time to look at cleaning up the code structure a bit.
1332 // Revision 1.14 1997/06/16 19:32:51 curt
1333 // Starting to add general timer support.
1335 // Revision 1.13 1997/06/02 03:40:06 curt
1336 // A tiny bit more view tweaking.
1338 // Revision 1.12 1997/06/02 03:01:38 curt
1339 // Working on views (side, front, back, transitions, etc.)
1341 // Revision 1.11 1997/05/31 19:16:25 curt
1342 // Elevator trim added.
1344 // Revision 1.10 1997/05/31 04:13:52 curt
1345 // WE CAN NOW FLY!!!
1347 // Continuing work on the LaRCsim flight model integration.
1348 // Added some MSFS-like keyboard input handling.
1350 // Revision 1.9 1997/05/30 19:27:01 curt
1351 // The LaRCsim flight model is starting to look like it is working.
1353 // Revision 1.8 1997/05/30 03:54:10 curt
1354 // Made a bit more progress towards integrating the LaRCsim flight model.
1356 // Revision 1.7 1997/05/29 22:39:49 curt
1357 // Working on incorporating the LaRCsim flight model.
1359 // Revision 1.6 1997/05/29 12:31:39 curt
1360 // Minor tweaks, moving towards general flight model integration.
1362 // Revision 1.5 1997/05/29 02:33:23 curt
1363 // Updated to reflect changing interfaces in other "modules."
1365 // Revision 1.4 1997/05/27 17:44:31 curt
1366 // Renamed & rearranged variables and routines. Added some initial simple
1367 // timer/alarm routines so the flight model can be updated on a regular
1370 // Revision 1.3 1997/05/23 15:40:25 curt
1371 // Added GNU copyright headers.
1374 // Revision 1.2 1997/05/23 00:35:12 curt
1375 // Trying to get fog to work ...
1377 // Revision 1.1 1997/05/21 15:57:51 curt
1378 // Renamed due to added GLUT support.
1380 // Revision 1.3 1997/05/19 18:22:42 curt
1381 // Parameter tweaking ... starting to stub in fog support.
1383 // Revision 1.2 1997/05/17 00:17:34 curt
1384 // Trying to stub in support for standard OpenGL.
1386 // Revision 1.1 1997/05/16 16:05:52 curt
1387 // Initial revision.