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 #ifdef IS_THIS_BETTER_THAN_A_ZERO_CHARLIE
178 // Draw a basic instrument panel
179 static void fgUpdateInstrViewParams( void ) {
187 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) / 2);
189 xglMatrixMode(GL_PROJECTION);
193 gluOrtho2D(0, 640, 0, 480);
194 xglMatrixMode(GL_MODELVIEW);
198 xglColor3f(1.0, 1.0, 1.0);
201 xglDisable(GL_DEPTH_TEST);
202 xglDisable(GL_LIGHTING);
205 xglColor3f (0.5, 0.5, 0.5);
208 xglVertex2f(0.0, 0.00);
209 xglVertex2f(0.0, 480.0);
210 xglVertex2f(640.0,480.0);
211 xglVertex2f(640.0, 0.0);
214 xglRectf(0.0,0.0, 640, 480);
215 xglEnable(GL_DEPTH_TEST);
216 xglEnable(GL_LIGHTING);
217 xglMatrixMode(GL_PROJECTION);
219 xglMatrixMode(GL_MODELVIEW);
225 // Update all Visuals (redraws anything graphics related)
226 static void fgRenderFrame( void ) {
232 // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
233 GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
234 GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
235 GLbitfield clear_mask;
237 f = current_aircraft.flight;
238 l = &cur_light_params;
239 t = &cur_time_params;
242 if ( idle_state != 1000 ) {
243 // still initializing, draw the splash screen
244 if ( current_options.get_splash_screen() == 1 ) {
248 // idle_state is now 1000 meaning we've finished all our
249 // initializations and are running the main loop, so this will
250 // now work without seg faulting the system.
252 // printf("Ground = %.2f Altitude = %.2f\n", scenery.cur_elev,
253 // FG_Altitude * FEET_TO_METER);
255 // this is just a temporary hack, to make me understand Pui
256 // timerText -> setLabel (ctime (&t->cur_time));
259 // update view volume parameters
260 v->UpdateViewParams();
262 clear_mask = GL_DEPTH_BUFFER_BIT;
263 if ( current_options.get_wireframe() ) {
264 clear_mask |= GL_COLOR_BUFFER_BIT;
266 if ( current_options.get_skyblend() ) {
267 if ( current_options.get_textures() ) {
268 // glClearColor(black[0], black[1], black[2], black[3]);
269 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
270 l->adj_fog_color[2], l->adj_fog_color[3]);
271 clear_mask |= GL_COLOR_BUFFER_BIT;
274 glClearColor(l->sky_color[0], l->sky_color[1],
275 l->sky_color[2], l->sky_color[3]);
276 clear_mask |= GL_COLOR_BUFFER_BIT;
278 xglClear( clear_mask );
280 // Tell GL we are switching to model view parameters
281 xglMatrixMode(GL_MODELVIEW);
282 // xglLoadIdentity();
285 xglDisable( GL_DEPTH_TEST );
286 xglDisable( GL_LIGHTING );
287 xglDisable( GL_CULL_FACE );
288 xglDisable( GL_FOG );
289 xglShadeModel( GL_SMOOTH );
290 if ( current_options.get_skyblend() ) {
294 // setup transformation for drawing astronomical objects
296 // Translate to view position
297 xglTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
298 // Rotate based on gst (sidereal time)
299 // note: constant should be 15.041085, Curt thought it was 15
300 angle = t->gst * 15.041085;
301 // printf("Rotating astro objects by %.2f degrees\n",angle);
302 xglRotatef( angle, 0.0, 0.0, -1.0 );
304 // draw stars and planets
312 xglEnable( GL_LIGHTING );
313 xglEnable( GL_LIGHT0 );
314 // set lighting parameters
315 xglLightfv(GL_LIGHT0, GL_AMBIENT, white );
316 xglLightfv(GL_LIGHT0, GL_DIFFUSE, white );
317 xglEnable( GL_CULL_FACE );
319 // Let's try some blending technique's (Durk)
321 glBlendFunc(GL_ONE, GL_ONE);
328 if ( current_options.get_shading() ) {
329 xglShadeModel( GL_SMOOTH );
331 xglShadeModel( GL_FLAT );
333 xglEnable( GL_DEPTH_TEST );
334 if ( current_options.get_fog() > 0 ) {
336 xglFogfv (GL_FOG_COLOR, l->adj_fog_color);
338 // set lighting parameters
339 xglLightfv(GL_LIGHT0, GL_AMBIENT, l->scene_ambient );
340 xglLightfv(GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
342 if ( current_options.get_textures() ) {
343 // texture parameters
344 xglEnable( GL_TEXTURE_2D );
345 xglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
346 xglHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
347 // set base color (I don't think this is doing anything here)
348 xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
349 xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
351 xglDisable( GL_TEXTURE_2D );
352 xglMaterialfv (GL_FRONT, GL_AMBIENT, terrain_color);
353 xglMaterialfv (GL_FRONT, GL_DIFFUSE, terrain_color);
354 // xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
355 // xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
360 xglDisable( GL_TEXTURE_2D );
362 // display HUD && Panel
365 // display instruments
366 // if (!o->panel_status) {
367 // fgUpdateInstrViewParams();
370 // We can do translucent menus, so why not. :-)
371 xglEnable ( GL_BLEND ) ;
372 xglBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
374 xglDisable ( GL_BLEND ) ;
381 // Update internal time dependent calculations (i.e. flight model)
382 void fgUpdateTimeDepCalcs(int multi_loop) {
389 f = current_aircraft.flight;
390 l = &cur_light_params;
391 t = &cur_time_params;
394 // update the flight model
395 if ( multi_loop < 0 ) {
396 multi_loop = DEFAULT_MULTILOOP;
400 // printf("updating flight model x %d\n", multi_loop);
401 fgFlightModelUpdate(current_options.get_flight_model(), f, multi_loop);
403 fgFlightModelUpdate(current_options.get_flight_model(), f, 0);
406 // update the view angle
407 for ( i = 0; i < multi_loop; i++ ) {
408 if ( fabs(v->goal_view_offset - v->view_offset) < 0.05 ) {
409 v->view_offset = v->goal_view_offset;
412 // move v->view_offset towards v->goal_view_offset
413 if ( v->goal_view_offset > v->view_offset ) {
414 if ( v->goal_view_offset - v->view_offset < FG_PI ) {
415 v->view_offset += 0.01;
417 v->view_offset -= 0.01;
420 if ( v->view_offset - v->goal_view_offset < FG_PI ) {
421 v->view_offset -= 0.01;
423 v->view_offset += 0.01;
426 if ( v->view_offset > FG_2PI ) {
427 v->view_offset -= FG_2PI;
428 } else if ( v->view_offset < 0 ) {
429 v->view_offset += FG_2PI;
434 double tmp = -(l->sun_rotation + FG_PI) - (FG_Psi - v->view_offset);
435 while ( tmp < 0.0 ) {
438 while ( tmp > FG_2PI ) {
441 /* printf("Psi = %.2f, viewoffset = %.2f sunrot = %.2f rottosun = %.2f\n",
442 FG_Psi * RAD_TO_DEG, v->view_offset * RAD_TO_DEG,
443 -(l->sun_rotation+FG_PI) * RAD_TO_DEG, tmp * RAD_TO_DEG); */
448 void fgInitTimeDepCalcs( void ) {
451 #ifdef HAVE_SETITIMER
452 fgTimerInit( 1.0 / DEFAULT_TIMER_HZ, fgUpdateTimeDepCalcs );
453 #endif HAVE_SETITIMER
458 // What should we do when we have nothing else to do? Let's get ready
459 // for the next move and update the display?
460 static void fgMainLoop( void ) {
464 static int remainder = 0;
465 int elapsed, multi_loop;
468 // double joy_x, joy_y;
469 // int joy_b1, joy_b2;
471 f = current_aircraft.flight;
473 t = &cur_time_params;
475 fgPrintf( FG_ALL, FG_DEBUG, "Running Main Loop\n");
476 fgPrintf( FG_ALL, FG_DEBUG, "======= ==== ====\n");
478 // Fix elevation. I'm just sticking this here for now, it should
479 // probably move eventually
481 /* printf("Before - ground = %.2f runway = %.2f alt = %.2f\n",
483 FG_Runway_altitude * FEET_TO_METER,
484 FG_Altitude * FEET_TO_METER); */
486 if ( scenery.cur_elev > -9990 ) {
487 if ( FG_Altitude * FEET_TO_METER <
488 (scenery.cur_elev + 3.758099 * FEET_TO_METER - 3.0) ) {
489 // now set aircraft altitude above ground
490 printf("Current Altitude = %.2f < %.2f forcing to %.2f\n",
491 FG_Altitude * FEET_TO_METER,
492 scenery.cur_elev + 3.758099 * FEET_TO_METER - 3.0,
493 scenery.cur_elev + 3.758099 * FEET_TO_METER);
494 fgFlightModelSetAltitude( current_options.get_flight_model(), f,
496 3.758099 * FEET_TO_METER);
498 fgPrintf( FG_ALL, FG_BULK,
499 "<*> resetting altitude to %.0f meters\n",
500 FG_Altitude * FEET_TO_METER);
502 FG_Runway_altitude = scenery.cur_elev * METER_TO_FEET;
505 /* printf("Adjustment - ground = %.2f runway = %.2f alt = %.2f\n",
507 FG_Runway_altitude * FEET_TO_METER,
508 FG_Altitude * FEET_TO_METER); */
514 /* fgJoystickRead( &joy_x, &joy_y, &joy_b1, &joy_b2 );
515 printf( "Joystick X %f Y %f B1 %d B2 %d\n",
516 joy_x, joy_y, joy_b1, joy_b2 );
518 fgAileronSet( joy_x ); */
520 // Get elapsed time for this past frame
521 elapsed = fgGetTimeInterval();
522 fgPrintf( FG_ALL, FG_BULK,
523 "Time interval is = %d, previous remainder is = %d\n",
526 // Calculate frame rate average
527 if ( elapsed > 0.0 ) {
529 for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
530 accum += g->frames[i];
531 // printf("frame[%d] = %.2f\n", i, g->frames[i]);
532 g->frames[i+1] = g->frames[i];
534 g->frames[0] = 1000.0 / (float)elapsed;
535 // printf("frame[0] = %.2f\n", g->frames[0]);
536 accum += g->frames[0];
537 g->frame_rate = accum / (float)FG_FRAME_RATE_HISTORY;
538 // printf("ave = %.2f\n", g->frame_rate);
541 // Calculate model iterations needed for next frame
542 fgPrintf( FG_ALL, FG_DEBUG,
543 "--> Frame rate is = %.2f\n", g->frame_rate);
544 elapsed += remainder;
546 multi_loop = (int)(((float)elapsed * 0.001) * DEFAULT_MODEL_HZ);
547 remainder = elapsed - ((multi_loop*1000) / DEFAULT_MODEL_HZ);
548 fgPrintf( FG_ALL, FG_BULK,
549 "Model iterations needed = %d, new remainder = %d\n",
550 multi_loop, remainder);
552 /* printf("right before fm - ground = %.2f runway = %.2f alt = %.2f\n",
554 FG_Runway_altitude * FEET_TO_METER,
555 FG_Altitude * FEET_TO_METER); */
558 if ( ! use_signals ) {
560 fgUpdateTimeDepCalcs(multi_loop);
563 /* printf("After fm - ground = %.2f runway = %.2f alt = %.2f\n",
565 FG_Runway_altitude * FEET_TO_METER,
566 FG_Altitude * FEET_TO_METER); */
568 // fgAircraftOutputCurrent(a);
570 // see if we need to load any new scenery tiles
573 // Process/manage pending events
574 global_events.Process();
576 // Run audio scheduler
577 #ifdef ENABLE_AUDIO_SUPPORT
578 if ( current_options.get_sound() ) {
579 audio_sched -> update();
586 fgPrintf( FG_ALL, FG_DEBUG, "\n");
590 // This is the top level master main function that is registered as
594 // The first few passes take care of initialization things (a couple
595 // per pass) and once everything has been initialized fgMainLoop from
598 static void fgIdleFunction ( void ) {
600 char path[256], mp3file[256], command[256], slfile[256];
601 static char *lockfile = "/tmp/mpg123.running";
605 // printf("idle state == %d\n", idle_state);
607 if ( idle_state == 0 ) {
608 // Initialize the splash screen right away
609 if ( current_options.get_splash_screen() ) {
614 } else if ( idle_state == 1 ) {
615 // Start the intro music
617 if ( current_options.get_intro_music() ) {
618 current_options.get_fg_root(mp3file);
619 strcat(mp3file, "/Sounds/");
620 strcat(mp3file, "intro.mp3");
623 "(touch %s; mpg123 %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);
632 } else if ( idle_state == 2 ) {
633 // These are a few miscellaneous things that aren't really
634 // "subsystems" but still need to be initialized.
637 if ( strstr ( g->glRenderer, "Glide" ) ) {
638 grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
643 } else if ( idle_state == 3 ) {
644 // This is the top level init routine which calls all the
645 // other subsystem initialization routines. If you are adding
646 // a subsystem to flight gear, its initialization call should
647 // located in this routine.
648 if( !fgInitSubsystems()) {
649 fgPrintf( FG_GENERAL, FG_EXIT,
650 "Subsystem initializations failed ...\n" );
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 struct stat stat_buf;
677 fgPrintf( FG_GENERAL, FG_INFO,
678 "Waiting for mpg123 player to finish ...\n" );
679 while ( stat(lockfile, &stat_buf) == 0 ) {
680 // file exist, wait ...
682 fgPrintf( FG_GENERAL, FG_INFO, ".");
684 fgPrintf( FG_GENERAL, FG_INFO, "\n");
688 audio_sched = new slScheduler ( 8000 );
689 audio_mixer = new smMixer;
690 audio_mixer -> setMasterVolume ( 80 ) ; /* 80% of max volume. */
691 audio_sched -> setSafetyMargin ( 1.0 ) ;
692 current_options.get_fg_root(path);
693 strcat(path, "/Sounds/");
694 strcpy(slfile, path);
695 strcat(slfile, "wasp.wav");
697 s1 = new slSample ( slfile );
698 printf("Rate = %d Bps = %d Stereo = %d\n",
699 s1 -> getRate(), s1 -> getBps(), s1 -> getStereo());
700 audio_sched -> loopSample ( s1 );
702 // strcpy(slfile, path);
703 // strcat(slfile, "thunder.wav");
704 // s2 -> loadFile ( slfile );
705 // s2 -> adjustVolume(0.5);
706 // audio_sched -> playSample ( s2 );
713 if ( idle_state == 1000 ) {
714 // We've finished all our initialization steps, from now on we
715 // run the main loop.
719 if ( current_options.get_splash_screen() == 1 ) {
726 // Handle new window size or exposure
727 static void fgReshape( int width, int height ) {
732 // Do this so we can call fgReshape(0,0) ourselves without having
733 // to know what the values of width & height are.
734 if ( (height > 0) && (width > 0) ) {
735 v->win_ratio = (GLfloat) width / (GLfloat) height;
739 v->winHeight = height;
741 // Inform gl of our view window size (now handled elsewhere)
742 // xglViewport(0, 0, (GLint)width, (GLint)height);
743 if ( idle_state == 1000 ) {
744 // yes we've finished all our initializations and are running
745 // the main loop, so this will now work without seg faulting
747 v->UpdateViewParams();
750 // xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
754 // Initialize GLUT and define a main window
755 int fgGlutInit( int *argc, char **argv ) {
756 // GLUT will extract all glut specific options so later on we only
757 // need wory about our own.
758 xglutInit(argc, argv);
760 // Define Display Parameters
761 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
763 // Define initial window size
764 xglutInitWindowSize(640, 480);
766 // Initialize windows
767 if ( current_options.get_game_mode() == 0 ) {
768 // Open the regular window
769 xglutCreateWindow("Flight Gear");
771 // Open the cool new 'game mode' window
772 glutGameModeString("width=640 height=480 bpp=16");
780 // Initialize GLUT event handlers
781 int fgGlutInitEvents( void ) {
782 // call fgReshape() on window resizes
783 xglutReshapeFunc( fgReshape );
785 // call GLUTkey() on keyboard event
786 xglutKeyboardFunc( GLUTkey );
787 glutSpecialFunc( GLUTspecialkey );
789 // call guiMouseFunc() whenever our little rodent is used
790 glutMouseFunc ( guiMouseFunc );
791 glutMotionFunc (guiMotionFunc );
792 glutPassiveMotionFunc (guiMotionFunc );
794 // call fgMainLoop() whenever there is
795 // nothing else to do
796 xglutIdleFunc( fgIdleFunction );
799 xglutDisplayFunc( fgRenderFrame );
806 int main( int argc, char **argv ) {
809 int result; // Used in command line argument.
811 f = current_aircraft.flight;
814 _control87(MCW_EM, MCW_EM); /* defined in float.h */
817 // Initialize the debugging output system
820 fgPrintf(FG_GENERAL, FG_INFO, "Flight Gear: Version %s\n\n", VERSION);
822 // Attempt to locate and parse a config file
823 // First check fg_root
824 current_options.get_fg_root(config);
825 strcat(config, "/system.fgfsrc");
826 result = current_options.parse_config_file(config);
828 // Next check home directory
829 if ( getenv("HOME") != NULL ) {
830 strcpy(config, getenv("HOME"));
831 strcat(config, "/.fgfsrc");
832 result = current_options.parse_config_file(config);
835 // Parse remaining command line options
836 // These will override anything specified in a config file
837 result = current_options.parse_command_line(argc, argv);
838 if ( result != FG_OPTIONS_OK ) {
839 // Something must have gone horribly wrong with the command
840 // line parsing or maybe the user just requested help ... :-)
841 current_options.usage();
842 fgPrintf( FG_GENERAL, FG_EXIT, "\nExiting ...\n");
845 // Initialize the Window/Graphics environment.
846 if( !fgGlutInit(&argc, argv) ) {
847 fgPrintf( FG_GENERAL, FG_EXIT, "GLUT initialization failed ...\n" );
850 // Initialize the various GLUT Event Handlers.
851 if( !fgGlutInitEvents() ) {
852 fgPrintf( FG_GENERAL, FG_EXIT,
853 "GLUT event handler initialization failed ...\n" );
856 // First do some quick general initializations
857 if( !fgInitGeneral()) {
858 fgPrintf( FG_GENERAL, FG_EXIT,
859 "General initializations failed ...\n" );
862 // Init the user interface (we need to do this before passing off
866 // pass control off to the master GLUT event handler
869 // we never actually get here ... but just in case ... :-)
875 // Revision 1.46 1998/08/22 14:49:56 curt
876 // Attempting to iron out seg faults and crashes.
877 // Did some shuffling to fix a initialization order problem between view
878 // position, scenery elevation.
880 // Revision 1.45 1998/08/20 20:32:31 curt
881 // Reshuffled some of the code in and around views.[ch]xx
883 // Revision 1.44 1998/08/20 15:10:33 curt
884 // Added GameGLUT support.
886 // Revision 1.43 1998/08/12 21:01:47 curt
887 // Master volume from 30% -> 80%
889 // Revision 1.42 1998/07/30 23:48:25 curt
890 // Output position & orientation when pausing.
891 // Eliminated libtool use.
892 // Added options to specify initial position and orientation.
893 // Changed default fov to 55 degrees.
894 // Added command line option to start in paused or unpaused state.
896 // Revision 1.41 1998/07/27 18:41:24 curt
897 // Added a pause command "p"
898 // Fixed some initialization order problems between pui and glut.
899 // Added an --enable/disable-sound option.
901 // Revision 1.40 1998/07/24 21:56:59 curt
902 // 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.
904 // Revision 1.39 1998/07/24 21:39:08 curt
905 // Debugging output tweaks.
906 // Cast glGetString to (char *) to avoid compiler errors.
907 // Optimizations to fgGluLookAt() by Norman Vine.
909 // Revision 1.38 1998/07/22 21:40:43 curt
910 // Clear to adjusted fog color (for sunrise/sunset effects)
911 // Make call to fog sunrise/sunset adjustment method.
912 // Add a stdc++ library bug work around to fg_init.cxx
914 // Revision 1.37 1998/07/20 12:49:44 curt
915 // Tweaked color buffer clearing defaults. We clear the color buffer if we
916 // are doing textures. Assumptions: If we are doing textures we have hardware
917 // support that can clear the color buffer for "free." If we are doing software
918 // rendering with textures, then the extra clear time gets lost in the noise.
920 // Revision 1.36 1998/07/16 17:33:35 curt
921 // "H" / "h" now control hud brightness as well with off being one of the
923 // Better checking for xmesa/fx 3dfx fullscreen/window support for deciding
924 // whether or not to build in the feature.
925 // Translucent menu support.
926 // HAVE_AUDIO_SUPPORT -> ENABLE_AUDIO_SUPPORT
927 // Use fork() / wait() for playing mp3 init music in background under unix.
928 // Changed default tile diameter to 5.
930 // Revision 1.35 1998/07/13 21:01:36 curt
931 // Wrote access functions for current fgOPTIONS.
933 // Revision 1.34 1998/07/13 15:32:37 curt
934 // Clear color buffer if drawing wireframe.
935 // When specifying and airport, start elevation at -1000 and let the system
936 // position you at ground level.
938 // Revision 1.33 1998/07/12 03:14:42 curt
939 // Added ground collision detection.
940 // Did some serious horsing around to be able to "hug" the ground properly
941 // and still be able to take off.
942 // Set the near clip plane to 1.0 meters when less than 10 meters above the
944 // Did some serious horsing around getting the initial airplane position to be
945 // correct based on rendered terrain elevation.
946 // Added a little cheat/hack that will prevent the view position from ever
947 // dropping below the terrain, even when the flight model doesn't quite
948 // put you as high as you'd like.
950 // Revision 1.32 1998/07/08 14:45:07 curt
951 // polar3d.h renamed to polar3d.hxx
952 // vector.h renamed to vector.hxx
953 // updated audio support so it waits to create audio classes (and tie up
954 // /dev/dsp) until the mpg123 player is finished.
956 // Revision 1.31 1998/07/06 21:34:17 curt
957 // Added an enable/disable splash screen option.
958 // Added an enable/disable intro music option.
959 // Added an enable/disable instrument panel option.
960 // Added an enable/disable mouse pointer option.
961 // Added using namespace std for compilers that support this.
963 // Revision 1.30 1998/07/06 02:42:03 curt
964 // Added support for switching between fullscreen and window mode for
967 // Added a basic splash screen. Restructured the main loop and top level
968 // initialization routines to do this.
970 // Hacked in some support for playing a startup mp3 sound file while rest
971 // of sim initializes. Currently only works in Unix using the mpg123 player.
972 // Waits for the mpg123 player to finish before initializing internal
975 // Revision 1.29 1998/07/04 00:52:22 curt
976 // Add my own version of gluLookAt() (which is nearly identical to the
977 // Mesa/glu version.) But, by calculating the Model View matrix our selves
978 // we can save this matrix without having to read it back in from the video
979 // card. This hopefully allows us to save a few cpu cycles when rendering
980 // out the fragments because we can just use glLoadMatrixd() with the
981 // precalculated matrix for each tile rather than doing a push(), translate(),
982 // pop() for every fragment.
984 // Panel status defaults to off for now until it gets a bit more developed.
986 // Extract OpenGL driver info on initialization.
988 // Revision 1.28 1998/06/27 16:54:32 curt
989 // Replaced "extern displayInstruments" with a entry in fgOPTIONS.
990 // Don't change the view port when displaying the panel.
992 // Revision 1.27 1998/06/17 21:35:10 curt
993 // Refined conditional audio support compilation.
994 // Moved texture parameter setup calls to ../Scenery/materials.cxx
995 // #include <string.h> before various STL includes.
996 // Make HUD default state be enabled.
998 // Revision 1.26 1998/06/13 00:40:32 curt
999 // Tweaked fog command line options.
1001 // Revision 1.25 1998/06/12 14:27:26 curt
1002 // Pui -> PUI, Gui -> GUI.
1004 // Revision 1.24 1998/06/12 00:57:39 curt
1005 // Added support for Pui/Gui.
1006 // Converted fog to GL_FOG_EXP2.
1007 // Link to static simulator parts.
1008 // Update runfg.bat to try to be a little smarter.
1010 // Revision 1.23 1998/06/08 17:57:04 curt
1011 // Minor sound/startup position tweaks.
1013 // Revision 1.22 1998/06/05 18:18:40 curt
1014 // A bit of fiddling with audio ...
1016 // Revision 1.21 1998/06/03 22:01:06 curt
1017 // Tweaking sound library usage.
1019 // Revision 1.20 1998/06/03 00:47:11 curt
1020 // Updated to compile in audio support if OSS available.
1021 // Updated for new version of Steve's audio library.
1022 // STL includes don't use .h
1023 // Small view optimizations.
1025 // Revision 1.19 1998/06/01 17:54:40 curt
1026 // Added Linux audio support.
1027 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
1030 // Revision 1.18 1998/05/29 20:37:19 curt
1031 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
1032 // Read airport list into a "map" STL for dynamic list sizing and fast tree
1035 // Revision 1.17 1998/05/22 21:28:52 curt
1036 // Modifications to use the new fgEVENT_MGR class.
1038 // Revision 1.16 1998/05/20 20:51:33 curt
1039 // Tweaked smooth shaded texture lighting properties.
1040 // Converted fgLIGHT to a C++ class.
1042 // Revision 1.15 1998/05/16 13:08:34 curt
1043 // C++ - ified views.[ch]xx
1044 // Shuffled some additional view parameters into the fgVIEW class.
1045 // Changed tile-radius to tile-diameter because it is a much better
1047 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
1048 // to transform world space to eye space for view frustum culling.
1050 // Revision 1.14 1998/05/13 18:29:57 curt
1051 // Added a keyboard binding to dynamically adjust field of view.
1052 // Added a command line option to specify fov.
1053 // Adjusted terrain color.
1054 // Root path info moved to fgOPTIONS.
1055 // Added ability to parse options out of a config file.
1057 // Revision 1.13 1998/05/11 18:18:15 curt
1058 // For flat shading use "glHint (GL_FOG_HINT, GL_FASTEST )"
1060 // Revision 1.12 1998/05/07 23:14:15 curt
1061 // Added "D" key binding to set autopilot heading.
1062 // Made frame rate calculation average out over last 10 frames.
1063 // Borland C++ floating point exception workaround.
1064 // Added a --tile-radius=n option.
1066 // Revision 1.11 1998/05/06 03:16:23 curt
1067 // Added an averaged global frame rate counter.
1068 // Added an option to control tile radius.
1070 // Revision 1.10 1998/05/03 00:47:31 curt
1071 // Added an option to enable/disable full-screen mode.
1073 // Revision 1.9 1998/04/30 12:34:17 curt
1074 // Added command line rendering options:
1075 // enable/disable fog/haze
1076 // specify smooth/flat shading
1077 // disable sky blending and just use a solid color
1078 // enable wireframe drawing mode
1080 // Revision 1.8 1998/04/28 01:20:21 curt
1081 // Type-ified fgTIME and fgVIEW.
1082 // Added a command line option to disable textures.
1084 // Revision 1.7 1998/04/26 05:10:02 curt
1085 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
1087 // Revision 1.6 1998/04/25 22:06:30 curt
1088 // Edited cvs log messages in source files ... bad bad bad!
1090 // Revision 1.5 1998/04/25 20:24:01 curt
1091 // Cleaned up initialization sequence to eliminate interdependencies
1092 // between sun position, lighting, and view position. This creates a
1093 // valid single pass initialization path.
1095 // Revision 1.4 1998/04/24 14:19:30 curt
1098 // Revision 1.3 1998/04/24 00:49:18 curt
1099 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
1100 // Trying out some different option parsing code.
1101 // Some code reorganization.
1103 // Revision 1.2 1998/04/22 13:25:41 curt
1104 // C++ - ifing the code.
1105 // Starting a bit of reorganization of lighting code.
1107 // Revision 1.1 1998/04/21 17:02:39 curt
1108 // Prepairing for C++ integration.
1110 // Revision 1.71 1998/04/18 04:11:26 curt
1111 // Moved fg_debug to it's own library, added zlib support.
1113 // Revision 1.70 1998/04/14 02:21:02 curt
1114 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
1115 // <jgoeke@voyager.net>
1117 // Revision 1.69 1998/04/08 23:35:34 curt
1118 // Tweaks to Gnu automake/autoconf system.
1120 // Revision 1.68 1998/04/03 22:09:03 curt
1121 // Converting to Gnu autoconf system.
1123 // Revision 1.67 1998/03/23 21:24:37 curt
1124 // Source code formating tweaks.
1126 // Revision 1.66 1998/03/14 00:31:20 curt
1127 // Beginning initial terrain texturing experiments.
1129 // Revision 1.65 1998/03/09 22:45:57 curt
1130 // Minor tweaks for building on sparc platform.
1132 // Revision 1.64 1998/02/20 00:16:23 curt
1133 // Thursday's tweaks.
1135 // Revision 1.63 1998/02/16 16:17:39 curt
1138 // Revision 1.62 1998/02/16 13:39:42 curt
1139 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
1140 // tiles to occasionally be missing.
1142 // Revision 1.61 1998/02/12 21:59:46 curt
1143 // Incorporated code changes contributed by Charlie Hotchkiss
1144 // <chotchkiss@namg.us.anritsu.com>
1146 // Revision 1.60 1998/02/11 02:50:40 curt
1149 // Revision 1.59 1998/02/09 22:56:54 curt
1150 // Removed "depend" files from cvs control. Other minor make tweaks.
1152 // Revision 1.58 1998/02/09 15:07:49 curt
1155 // Revision 1.57 1998/02/07 15:29:40 curt
1156 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
1157 // <chotchkiss@namg.us.anritsu.com>
1159 // Revision 1.56 1998/02/03 23:20:23 curt
1160 // Lots of little tweaks to fix various consistency problems discovered by
1161 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
1162 // passed arguments along to the real printf(). Also incorporated HUD changes
1163 // by Michele America.
1165 // Revision 1.55 1998/02/02 20:53:58 curt
1166 // Incorporated Durk's changes.
1168 // Revision 1.54 1998/01/31 00:43:10 curt
1169 // Added MetroWorks patches from Carmen Volpe.
1171 // Revision 1.53 1998/01/27 18:35:54 curt
1174 // Revision 1.52 1998/01/27 00:47:56 curt
1175 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
1176 // system and commandline/config file processing code.
1178 // Revision 1.51 1998/01/26 15:57:05 curt
1179 // Tweaks for dynamic scenery development.
1181 // Revision 1.50 1998/01/19 19:27:07 curt
1182 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
1183 // This should simplify things tremendously.
1185 // Revision 1.49 1998/01/19 18:40:31 curt
1186 // Tons of little changes to clean up the code and to remove fatal errors
1187 // when building with the c++ compiler.
1189 // Revision 1.48 1998/01/19 18:35:46 curt
1190 // Minor tweaks and fixes for cygwin32.
1192 // Revision 1.47 1998/01/13 00:23:08 curt
1193 // Initial changes to support loading and management of scenery tiles. Note,
1194 // there's still a fair amount of work left to be done.
1196 // Revision 1.46 1998/01/08 02:22:06 curt
1197 // Beginning to integrate Tile management subsystem.
1199 // Revision 1.45 1998/01/07 03:18:55 curt
1200 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
1202 // Revision 1.44 1997/12/30 22:22:31 curt
1203 // Further integration of event manager.
1205 // Revision 1.43 1997/12/30 20:47:43 curt
1206 // Integrated new event manager with subsystem initializations.
1208 // Revision 1.42 1997/12/30 16:36:47 curt
1209 // Merged in Durk's changes ...
1211 // Revision 1.41 1997/12/30 13:06:56 curt
1212 // A couple lighting tweaks ...
1214 // Revision 1.40 1997/12/30 01:38:37 curt
1215 // Switched back to per vertex normals and smooth shading for terrain.
1217 // Revision 1.39 1997/12/22 23:45:45 curt
1218 // First stab at sunset/sunrise sky glow effects.
1220 // Revision 1.38 1997/12/22 04:14:28 curt
1221 // Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
1223 // Revision 1.37 1997/12/19 23:34:03 curt
1224 // Lot's of tweaking with sky rendering and lighting.
1226 // Revision 1.36 1997/12/19 16:44:57 curt
1227 // Working on scene rendering order and options.
1229 // Revision 1.35 1997/12/18 23:32:32 curt
1230 // First stab at sky dome actually starting to look reasonable. :-)
1232 // Revision 1.34 1997/12/17 23:13:34 curt
1233 // Began working on rendering a sky.
1235 // Revision 1.33 1997/12/15 23:54:45 curt
1236 // Add xgl wrappers for debugging.
1237 // Generate terrain normals on the fly.
1239 // Revision 1.32 1997/12/15 20:59:08 curt
1242 // Revision 1.31 1997/12/12 21:41:25 curt
1243 // More light/material property tweaking ... still a ways off.
1245 // Revision 1.30 1997/12/12 19:52:47 curt
1246 // Working on lightling and material properties.
1248 // Revision 1.29 1997/12/11 04:43:54 curt
1249 // Fixed sun vector and lighting problems. I thing the moon is now lit
1252 // Revision 1.28 1997/12/10 22:37:45 curt
1253 // Prepended "fg" on the name of all global structures that didn't have it yet.
1254 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
1256 // Revision 1.27 1997/12/09 05:11:54 curt
1257 // Working on tweaking lighting.
1259 // Revision 1.26 1997/12/09 04:25:29 curt
1260 // Working on adding a global lighting params structure.
1262 // Revision 1.25 1997/12/08 22:54:09 curt
1263 // Enabled GL_CULL_FACE.
1265 // Revision 1.24 1997/11/25 19:25:32 curt
1266 // Changes to integrate Durk's moon/sun code updates + clean up.
1268 // Revision 1.23 1997/11/15 18:16:34 curt
1271 // Revision 1.22 1997/10/30 12:38:41 curt
1272 // Working on new scenery subsystem.
1274 // Revision 1.21 1997/09/23 00:29:38 curt
1275 // Tweaks to get things to compile with gcc-win32.
1277 // Revision 1.20 1997/09/22 14:44:19 curt
1278 // Continuing to try to align stars correctly.
1280 // Revision 1.19 1997/09/18 16:20:08 curt
1281 // At dusk/dawn add/remove stars in stages.
1283 // Revision 1.18 1997/09/16 22:14:51 curt
1284 // Tweaked time of day lighting equations. Don't draw stars during the day.
1286 // Revision 1.17 1997/09/16 15:50:29 curt
1287 // Working on star alignment and time issues.
1289 // Revision 1.16 1997/09/13 02:00:06 curt
1290 // Mostly working on stars and generating sidereal time for accurate star
1293 // Revision 1.15 1997/09/05 14:17:27 curt
1294 // More tweaking with stars.
1296 // Revision 1.14 1997/09/05 01:35:53 curt
1297 // Working on getting stars right.
1299 // Revision 1.13 1997/09/04 02:17:34 curt
1302 // Revision 1.12 1997/08/27 21:32:24 curt
1303 // Restructured view calculation code. Added stars.
1305 // Revision 1.11 1997/08/27 03:30:16 curt
1306 // Changed naming scheme of basic shared structures.
1308 // Revision 1.10 1997/08/25 20:27:22 curt
1309 // Merged in initial HUD and Joystick code.
1311 // Revision 1.9 1997/08/22 21:34:39 curt
1312 // Doing a bit of reorganizing and house cleaning.
1314 // Revision 1.8 1997/08/19 23:55:03 curt
1315 // Worked on better simulating real lighting.
1317 // Revision 1.7 1997/08/16 12:22:38 curt
1318 // Working on improving the lighting/shading.
1320 // Revision 1.6 1997/08/13 20:24:56 curt
1321 // Changes due to changing sunpos interface.
1323 // Revision 1.5 1997/08/06 21:08:32 curt
1324 // Sun position now really* works (I think) ... I still have sun time warping
1325 // code in place, probably should remove it soon.
1327 // Revision 1.4 1997/08/06 15:41:26 curt
1328 // Working on correct sun position.
1330 // Revision 1.3 1997/08/06 00:24:22 curt
1331 // Working on correct real time sun lighting.
1333 // Revision 1.2 1997/08/04 20:25:15 curt
1334 // Organizational tweaking.
1336 // Revision 1.1 1997/08/02 18:45:00 curt
1337 // Renamed GLmain.c GLUTmain.c
1339 // Revision 1.43 1997/08/02 16:23:47 curt
1342 // Revision 1.42 1997/08/01 19:43:33 curt
1343 // Making progress with coordinate system overhaul.
1345 // Revision 1.41 1997/07/31 22:52:37 curt
1346 // Working on redoing internal coordinate systems & scenery transformations.
1348 // Revision 1.40 1997/07/30 16:12:42 curt
1349 // Moved fg_random routines from Util/ to Math/
1351 // Revision 1.39 1997/07/21 14:45:01 curt
1354 // Revision 1.38 1997/07/19 23:04:47 curt
1355 // Added an initial weather section.
1357 // Revision 1.37 1997/07/19 22:34:02 curt
1358 // Moved PI definitions to ../constants.h
1359 // Moved random() stuff to ../Utils/ and renamed fg_random()
1361 // Revision 1.36 1997/07/18 23:41:25 curt
1362 // Tweaks for building with Cygnus Win32 compiler.
1364 // Revision 1.35 1997/07/18 14:28:34 curt
1365 // Hacked in some support for wind/turbulence.
1367 // Revision 1.34 1997/07/16 20:04:48 curt
1368 // Minor tweaks to aid Win32 port.
1370 // Revision 1.33 1997/07/12 03:50:20 curt
1371 // Added an #include <Windows32/Base.h> to help compiling for Win32
1373 // Revision 1.32 1997/07/11 03:23:18 curt
1374 // Solved some scenery display/orientation problems. Still have a positioning
1375 // (or transformation?) problem.
1377 // Revision 1.31 1997/07/11 01:29:58 curt
1378 // More tweaking of terrian floor.
1380 // Revision 1.30 1997/07/10 04:26:37 curt
1381 // We now can interpolated ground elevation for any position in the grid. We
1382 // can use this to enforce a "hard" ground. We still need to enforce some
1383 // bounds checking so that we don't try to lookup data points outside the
1386 // Revision 1.29 1997/07/09 21:31:12 curt
1387 // Working on making the ground "hard."
1389 // Revision 1.28 1997/07/08 18:20:12 curt
1390 // Working on establishing a hard ground.
1392 // Revision 1.27 1997/07/07 20:59:49 curt
1393 // Working on scenery transformations to enable us to fly fluidly over the
1394 // poles with no discontinuity/distortion in scenery.
1396 // Revision 1.26 1997/07/05 20:43:34 curt
1397 // renamed mat3 directory to Math so we could add other math related routines.
1399 // Revision 1.25 1997/06/29 21:19:17 curt
1400 // Working on scenery management system.
1402 // Revision 1.24 1997/06/26 22:14:53 curt
1403 // Beginning work on a scenery management system.
1405 // Revision 1.23 1997/06/26 19:08:33 curt
1406 // Restructuring make, adding automatic "make dep" support.
1408 // Revision 1.22 1997/06/25 15:39:47 curt
1409 // Minor changes to compile with rsxnt/win32.
1411 // Revision 1.21 1997/06/22 21:44:41 curt
1412 // Working on intergrating the VRML (subset) parser.
1414 // Revision 1.20 1997/06/21 17:12:53 curt
1415 // Capitalized subdirectory names.
1417 // Revision 1.19 1997/06/18 04:10:31 curt
1418 // A couple more runway tweaks ...
1420 // Revision 1.18 1997/06/18 02:21:24 curt
1421 // Hacked in a runway
1423 // Revision 1.17 1997/06/17 16:51:58 curt
1424 // Timer interval stuff now uses gettimeofday() instead of ftime()
1426 // Revision 1.16 1997/06/17 04:19:16 curt
1427 // More timer related tweaks with respect to view direction changes.
1429 // Revision 1.15 1997/06/17 03:41:10 curt
1430 // Nonsignal based interval timing is now working.
1431 // This would be a good time to look at cleaning up the code structure a bit.
1433 // Revision 1.14 1997/06/16 19:32:51 curt
1434 // Starting to add general timer support.
1436 // Revision 1.13 1997/06/02 03:40:06 curt
1437 // A tiny bit more view tweaking.
1439 // Revision 1.12 1997/06/02 03:01:38 curt
1440 // Working on views (side, front, back, transitions, etc.)
1442 // Revision 1.11 1997/05/31 19:16:25 curt
1443 // Elevator trim added.
1445 // Revision 1.10 1997/05/31 04:13:52 curt
1446 // WE CAN NOW FLY!!!
1448 // Continuing work on the LaRCsim flight model integration.
1449 // Added some MSFS-like keyboard input handling.
1451 // Revision 1.9 1997/05/30 19:27:01 curt
1452 // The LaRCsim flight model is starting to look like it is working.
1454 // Revision 1.8 1997/05/30 03:54:10 curt
1455 // Made a bit more progress towards integrating the LaRCsim flight model.
1457 // Revision 1.7 1997/05/29 22:39:49 curt
1458 // Working on incorporating the LaRCsim flight model.
1460 // Revision 1.6 1997/05/29 12:31:39 curt
1461 // Minor tweaks, moving towards general flight model integration.
1463 // Revision 1.5 1997/05/29 02:33:23 curt
1464 // Updated to reflect changing interfaces in other "modules."
1466 // Revision 1.4 1997/05/27 17:44:31 curt
1467 // Renamed & rearranged variables and routines. Added some initial simple
1468 // timer/alarm routines so the flight model can be updated on a regular
1471 // Revision 1.3 1997/05/23 15:40:25 curt
1472 // Added GNU copyright headers.
1475 // Revision 1.2 1997/05/23 00:35:12 curt
1476 // Trying to get fog to work ...
1478 // Revision 1.1 1997/05/21 15:57:51 curt
1479 // Renamed due to added GLUT support.
1481 // Revision 1.3 1997/05/19 18:22:42 curt
1482 // Parameter tweaking ... starting to stub in fog support.
1484 // Revision 1.2 1997/05/17 00:17:34 curt
1485 // Trying to stub in support for standard OpenGL.
1487 // Revision 1.1 1997/05/16 16:05:52 curt
1488 // Initial revision.