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 <Include/fg_constants.h> // for VERSION
46 #include <Include/general.h>
48 #include <Aircraft/aircraft.h>
49 #include <Astro/moon.hxx>
50 #include <Astro/planets.hxx>
51 #include <Astro/sky.hxx>
52 #include <Astro/stars.hxx>
53 #include <Astro/sun.hxx>
56 # include <Audio/sl.h>
57 # include <Audio/sm.h>
60 #include <Cockpit/cockpit.hxx>
61 #include <Debug/fg_debug.h>
63 #include <Joystick/joystick.h>
64 #include <Math/fg_geodesy.h>
65 #include <Math/mat3.h>
66 #include <Math/polar3d.h>
68 #include <Scenery/scenery.hxx>
69 #include <Scenery/tilemgr.hxx>
70 #include <Time/event.hxx>
71 #include <Time/fg_time.hxx>
72 #include <Time/fg_timer.hxx>
73 #include <Time/sunpos.hxx>
74 #include <Weather/weather.h>
76 #include "GLUTkey.hxx"
77 #include "fg_init.hxx"
78 #include "options.hxx"
82 // This is a record containing global housekeeping information
88 // Yet another other hack. Used for my prototype instrument code. (Durk)
89 int displayInstruments;
91 // Global structures for the Audio library
93 slScheduler audio_sched ( 8000 ) ;
100 // The following defines flight gear options. Because glutlib will also
101 // want to parse its own options, those options must not be included here
102 // or they will get parsed by the main program option parser. Hence case
103 // is significant for any option added that might be in conflict with
106 // glutlib parses for:
108 // -direct (invalid in Win32)
112 // -indirect (invalid in Win32)
115 // Note that glutlib depends upon strings while this program's
116 // option parser wants only initial characters followed by numbers
121 // fgInitVisuals() -- Initialize various GL/view parameters
122 static void fgInitVisuals( void ) {
127 l = &cur_light_params;
128 o = ¤t_options;
129 w = ¤t_weather;
131 // Go full screen if requested ...
132 if ( o->fullscreen ) {
136 // If enabled, normal vectors specified with glNormal are scaled
137 // to unit length after transformation. See glNormal.
138 xglEnable( GL_NORMALIZE );
140 xglEnable( GL_LIGHTING );
141 xglEnable( GL_LIGHT0 );
142 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
144 // xglFogi (GL_FOG_MODE, GL_LINEAR);
145 xglFogi (GL_FOG_MODE, GL_EXP2);
146 // Fog density is now set when the weather system is initialized
147 // xglFogf (GL_FOG_DENSITY, w->fog_density);
148 if ( (o->fog == 1) || (o->shading == 0) ) {
149 // if fastest fog requested, or if flat shading force fastest
150 xglHint (GL_FOG_HINT, GL_FASTEST );
151 } else if ( o->fog == 2 ) {
152 xglHint (GL_FOG_HINT, GL_NICEST );
154 if ( o->wireframe ) {
156 xglPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
159 // This is the default anyways, but it can't hurt
160 xglFrontFace ( GL_CCW );
164 // Update the view volume, position, and orientation
165 static void fgUpdateViewParams( void ) {
171 f = current_aircraft.flight;
172 l = &cur_light_params;
173 o = ¤t_options;
177 v->UpdateWorldToEye(f);
179 if (displayInstruments) {
180 xglViewport( 0, (GLint)((v->winHeight) / 2 ) ,
181 (GLint)(v->winWidth), (GLint)(v->winHeight) / 2 );
182 // Tell GL we are about to modify the projection parameters
183 xglMatrixMode(GL_PROJECTION);
185 gluPerspective(o->fov, v->win_ratio / 2.0, 1.0, 100000.0);
187 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) );
188 // Tell GL we are about to modify the projection parameters
189 xglMatrixMode(GL_PROJECTION);
191 gluPerspective(o->fov, v->win_ratio, 10.0, 100000.0);
194 xglMatrixMode(GL_MODELVIEW);
197 // set up our view volume (default)
198 gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
199 v->view_pos.x + v->view_forward[0],
200 v->view_pos.y + v->view_forward[1],
201 v->view_pos.z + v->view_forward[2],
202 v->view_up[0], v->view_up[1], v->view_up[2]);
204 // look almost straight up (testing and eclipse watching)
205 /* gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
206 v->view_pos.x + v->view_up[0] + .001,
207 v->view_pos.y + v->view_up[1] + .001,
208 v->view_pos.z + v->view_up[2] + .001,
209 v->view_up[0], v->view_up[1], v->view_up[2]); */
211 // lock view horizontally towards sun (testing)
212 /* gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
213 v->view_pos.x + v->surface_to_sun[0],
214 v->view_pos.y + v->surface_to_sun[1],
215 v->view_pos.z + v->surface_to_sun[2],
216 v->view_up[0], v->view_up[1], v->view_up[2]); */
218 // lock view horizontally towards south (testing)
219 /* gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
220 v->view_pos.x + v->surface_south[0],
221 v->view_pos.y + v->surface_south[1],
222 v->view_pos.z + v->surface_south[2],
223 v->view_up[0], v->view_up[1], v->view_up[2]); */
225 // set the sun position
226 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
230 // Draw a basic instrument panel
231 static void fgUpdateInstrViewParams( void ) {
236 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) / 2);
238 xglMatrixMode(GL_PROJECTION);
242 gluOrtho2D(0, 640, 0, 480);
243 xglMatrixMode(GL_MODELVIEW);
247 xglColor3f(1.0, 1.0, 1.0);
250 xglDisable(GL_DEPTH_TEST);
251 xglDisable(GL_LIGHTING);
254 xglColor3f (0.5, 0.5, 0.5);
257 xglVertex2f(0.0, 0.00);
258 xglVertex2f(0.0, 480.0);
259 xglVertex2f(640.0,480.0);
260 xglVertex2f(640.0, 0.0);
263 xglRectf(0.0,0.0, 640, 480);
264 xglEnable(GL_DEPTH_TEST);
265 xglEnable(GL_LIGHTING);
266 xglMatrixMode(GL_PROJECTION);
268 xglMatrixMode(GL_MODELVIEW);
273 // Update all Visuals (redraws anything graphics related)
274 static void fgRenderFrame( void ) {
280 GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
281 GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
282 GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
284 l = &cur_light_params;
285 o = ¤t_options;
286 t = &cur_time_params;
289 // this is just a temporary hack, to make me understand Pui
290 timerText -> setLabel (ctime (&t->cur_time));
293 // update view volume parameters
294 fgUpdateViewParams();
297 glClearColor(black[0], black[1], black[2], black[3]);
298 xglClear( GL_DEPTH_BUFFER_BIT );
300 glClearColor(l->sky_color[0], l->sky_color[1],
301 l->sky_color[2], l->sky_color[3]);
302 xglClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
305 // Tell GL we are switching to model view parameters
306 xglMatrixMode(GL_MODELVIEW);
307 // xglLoadIdentity();
310 xglDisable( GL_DEPTH_TEST );
311 xglDisable( GL_LIGHTING );
312 xglDisable( GL_CULL_FACE );
313 xglDisable( GL_FOG );
314 xglShadeModel( GL_SMOOTH );
319 // setup transformation for drawing astronomical objects
321 // Translate to view position
322 xglTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
323 // Rotate based on gst (sidereal time)
324 angle = t->gst * 15.041085; /* should be 15.041085, Curt thought it was 15*/
325 // printf("Rotating astro objects by %.2f degrees\n",angle);
326 xglRotatef( angle, 0.0, 0.0, -1.0 );
328 // draw stars and planets
336 xglEnable( GL_LIGHTING );
337 // set lighting parameters
338 xglLightfv(GL_LIGHT0, GL_AMBIENT, white );
339 xglLightfv(GL_LIGHT0, GL_DIFFUSE, white );
340 xglEnable( GL_CULL_FACE );
342 // Let's try some blending technique's (Durk)
344 glBlendFunc(GL_ONE, GL_ONE);
352 xglShadeModel( GL_SMOOTH );
354 xglShadeModel( GL_FLAT );
356 xglEnable( GL_DEPTH_TEST );
359 xglFogfv (GL_FOG_COLOR, l->fog_color);
361 // set lighting parameters
362 xglLightfv(GL_LIGHT0, GL_AMBIENT, l->scene_ambient );
363 xglLightfv(GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
366 // texture parameters
367 xglEnable( GL_TEXTURE_2D );
368 xglTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT ) ;
369 xglTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT ) ;
370 xglTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ) ;
371 xglTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
372 GL_LINEAR /* GL_LINEAR_MIPMAP_LINEAR */ ) ;
373 xglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
374 xglHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
375 // set base color (I don't think this is doing anything here)
376 xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
377 xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
379 xglDisable( GL_TEXTURE_2D );
380 xglMaterialfv (GL_FRONT, GL_AMBIENT, terrain_color);
381 xglMaterialfv (GL_FRONT, GL_DIFFUSE, terrain_color);
382 // xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
383 // xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
388 xglDisable( GL_TEXTURE_2D );
391 if( o->hud_status ) {
395 // display instruments
396 if (displayInstruments) {
397 fgUpdateInstrViewParams();
404 // Update internal time dependent calculations (i.e. flight model)
405 void fgUpdateTimeDepCalcs(int multi_loop) {
411 f = current_aircraft.flight;
412 t = &cur_time_params;
415 // update the flight model
416 if ( multi_loop < 0 ) {
417 multi_loop = DEFAULT_MULTILOOP;
420 // printf("updating flight model x %d\n", multi_loop);
421 fgFlightModelUpdate(FG_LARCSIM, f, multi_loop);
423 // update the view angle
424 for ( i = 0; i < multi_loop; i++ ) {
425 if ( fabs(v->goal_view_offset - v->view_offset) < 0.05 ) {
426 v->view_offset = v->goal_view_offset;
429 // move v->view_offset towards v->goal_view_offset
430 if ( v->goal_view_offset > v->view_offset ) {
431 if ( v->goal_view_offset - v->view_offset < FG_PI ) {
432 v->view_offset += 0.01;
434 v->view_offset -= 0.01;
437 if ( v->view_offset - v->goal_view_offset < FG_PI ) {
438 v->view_offset -= 0.01;
440 v->view_offset += 0.01;
443 if ( v->view_offset > FG_2PI ) {
444 v->view_offset -= FG_2PI;
445 } else if ( v->view_offset < 0 ) {
446 v->view_offset += FG_2PI;
453 void fgInitTimeDepCalcs( void ) {
456 #ifdef HAVE_SETITIMER
457 fgTimerInit( 1.0 / DEFAULT_TIMER_HZ, fgUpdateTimeDepCalcs );
458 #endif HAVE_SETITIMER
463 // What should we do when we have nothing else to do? Let's get ready
464 // for the next move and update the display?
465 static void fgMainLoop( void ) {
470 static int remainder = 0;
471 int elapsed, multi_loop;
475 // double joy_x, joy_y;
476 // int joy_b1, joy_b2;
478 a = ¤t_aircraft;
481 t = &cur_time_params;
483 fgPrintf( FG_ALL, FG_DEBUG, "Running Main Loop\n");
484 fgPrintf( FG_ALL, FG_DEBUG, "======= ==== ====\n");
490 /* fgJoystickRead( &joy_x, &joy_y, &joy_b1, &joy_b2 );
491 printf( "Joystick X %f Y %f B1 %d B2 %d\n",
492 joy_x, joy_y, joy_b1, joy_b2 );
494 fgAileronSet( joy_x ); */
496 // Get elapsed time for this past frame
497 elapsed = fgGetTimeInterval();
498 fgPrintf( FG_ALL, FG_BULK,
499 "Time interval is = %d, previous remainder is = %d\n",
502 // Calculate frame rate average
503 if ( elapsed > 0.0 ) {
505 for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
506 accum += g->frames[i];
507 // printf("frame[%d] = %.2f\n", i, g->frames[i]);
508 g->frames[i+1] = g->frames[i];
510 g->frames[0] = 1000.0 / (float)elapsed;
511 // printf("frame[0] = %.2f\n", g->frames[0]);
512 accum += g->frames[0];
513 g->frame_rate = accum / (float)FG_FRAME_RATE_HISTORY;
514 // printf("ave = %.2f\n", g->frame_rate);
517 // Calculate model iterations needed for next frame
518 fgPrintf( FG_ALL, FG_DEBUG,
519 "--> Frame rate is = %.2f\n", g->frame_rate);
520 elapsed += remainder;
522 multi_loop = (int)(((float)elapsed * 0.001) * DEFAULT_MODEL_HZ);
523 remainder = elapsed - ((multi_loop*1000) / DEFAULT_MODEL_HZ);
524 fgPrintf( FG_ALL, FG_BULK,
525 "Model iterations needed = %d, new remainder = %d\n",
526 multi_loop, remainder);
529 if ( ! use_signals ) {
531 fgUpdateTimeDepCalcs(multi_loop);
534 // I'm just sticking this here for now, it should probably move
536 /* cur_elev = mesh_altitude(FG_Longitude * RAD_TO_ARCSEC,
537 FG_Latitude * RAD_TO_ARCSEC); */
538 // there is no ground collision detection really, so for now I
539 // just hard code the ground elevation to be 0 */
542 // printf("Ground elevation is %.2f meters here.\n", cur_elev);
543 // FG_Runway_altitude = cur_elev * METER_TO_FEET;
545 if ( FG_Altitude * FEET_TO_METER < cur_elev + 3.758099) {
546 // set this here, otherwise if we set runway height above our
547 // current height we get a really nasty bounce.
548 FG_Runway_altitude = FG_Altitude - 3.758099;
550 // now set aircraft altitude above ground
551 FG_Altitude = cur_elev * METER_TO_FEET + 3.758099;
552 fgPrintf( FG_ALL, FG_BULK, "<*> resetting altitude to %.0f meters\n",
553 FG_Altitude * FEET_TO_METER);
556 fgAircraftOutputCurrent(a);
558 // see if we need to load any new scenery tiles
561 // Process/manage pending events
562 global_events.Process();
564 // Run audio scheduler
565 #ifdef HAVE_OSS_AUDIO
566 audio_sched.update();
572 fgPrintf( FG_ALL, FG_DEBUG, "\n");
576 // Handle new window size or exposure
577 static void fgReshape( int width, int height ) {
582 // Do this so we can call fgReshape(0,0) ourselves without having
583 // to know what the values of width & height are.
584 if ( (height > 0) && (width > 0) ) {
585 v->win_ratio = (GLfloat) width / (GLfloat) height;
589 v->winHeight = height;
591 // Inform gl of our view window size (now handled elsewhere)
592 // xglViewport(0, 0, (GLint)width, (GLint)height);
593 fgUpdateViewParams();
595 // xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
599 // Initialize GLUT and define a main window
600 int fgGlutInit( int *argc, char **argv ) {
601 // GLUT will extract all glut specific options so later on we only
602 // need wory about our own.
603 xglutInit(argc, argv);
605 // Define Display Parameters
606 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
608 // Define initial window size
609 xglutInitWindowSize(640, 480);
611 // Initialize windows
612 xglutCreateWindow("Flight Gear");
618 // Initialize GLUT event handlers
619 int fgGlutInitEvents( void ) {
620 // call fgReshape() on window resizes
621 xglutReshapeFunc( fgReshape );
623 // call GLUTkey() on keyboard event
624 xglutKeyboardFunc( GLUTkey );
625 glutSpecialFunc( GLUTspecialkey );
627 // call guiMouseFunc() whenever our little rodent is used
628 glutMouseFunc ( guiMouseFunc );
629 glutMotionFunc (guiMotionFunc );
630 glutPassiveMotionFunc (guiMotionFunc );
632 // call fgMainLoop() whenever there is
633 // nothing else to do
634 xglutIdleFunc( fgMainLoop );
637 xglutDisplayFunc( fgRenderFrame );
644 int main( int argc, char **argv ) {
648 char path[256], slfile[256];
649 int result; // Used in command line argument.
651 f = current_aircraft.flight;
652 o = ¤t_options;
655 _control87(MCW_EM, MCW_EM); /* defined in float.h */
658 // Initialize the debugging output system
661 fgPrintf(FG_GENERAL, FG_INFO, "Flight Gear: Version %s\n\n", VERSION);
663 // Initialize the Window/Graphics environment.
664 if( !fgGlutInit(&argc, argv) ) {
665 fgPrintf( FG_GENERAL, FG_EXIT, "GLUT initialization failed ...\n" );
668 // Attempt to locate and parse a config file
669 // First check fg_root
670 strcpy(config, o->fg_root);
671 strcat(config, "/system.fgfsrc");
672 result = o->parse_config_file(config);
674 // Next check home directory
675 if ( getenv("HOME") != NULL ) {
676 strcpy(config, getenv("HOME"));
677 strcat(config, "/.fgfsrc");
678 result = o->parse_config_file(config);
681 // Parse remaining command line options
682 // These will override anything specified in a config file
683 result = o->parse_command_line(argc, argv);
684 if ( result != FG_OPTIONS_OK ) {
685 // Something must have gone horribly wrong with the command
686 // line parsing or maybe the user just requested help ... :-)
688 fgPrintf( FG_GENERAL, FG_EXIT, "\nExiting ...\n");
691 // These are a few miscellaneous things that aren't really
692 // "subsystems" but still need to be initialized.
693 if( !fgInitGeneral()) {
694 fgPrintf( FG_GENERAL, FG_EXIT, "General initializations failed ...\n" );
697 // This is the top level init routine which calls all the other
698 // subsystem initialization routines. If you are adding a
699 // subsystem to flight gear, its initialization call should
700 // located in this routine.
701 if( !fgInitSubsystems()) {
702 fgPrintf( FG_GENERAL, FG_EXIT,
703 "Subsystem initializations failed ...\n" );
706 // setup OpenGL view parameters
710 // init timer routines, signals, etc. Arrange for an alarm
711 // signal to be generated, etc.
712 fgInitTimeDepCalcs();
715 // Initialize the various GLUT Event Handlers.
716 if( !fgGlutInitEvents() ) {
717 fgPrintf( FG_GENERAL, FG_EXIT,
718 "GLUT event handler initialization failed ...\n" );
721 //Init the user interface
724 // Initialize audio support
725 #ifdef HAVE_OSS_AUDIO
726 audio_mixer . setMasterVolume ( 30 ) ; /* 50% of max volume. */
727 audio_sched . setSafetyMargin ( 1.0 ) ;
728 strcpy(path, o->fg_root);
729 strcat(path, "/Sounds/");
731 strcpy(slfile, path);
732 strcat(slfile, "prpidle.wav");
733 // s1 = new slSample ( slfile );
734 s1 = new slSample ( "/dos/X-System-HSR/sounds/xp_recip.wav", &audio_sched );
735 printf("Rate = %d Bps = %d Stereo = %d\n",
736 s1 -> getRate(), s1 -> getBps(), s1 -> getStereo());
737 audio_sched . loopSample ( s1 );
739 // strcpy(slfile, path);
740 // strcat(slfile, "thunder.wav");
741 // s2 -> loadFile ( slfile );
742 // s2 -> adjustVolume(0.5);
743 // audio_sched -> playSample ( s2 );
746 // pass control off to the master GLUT event handler
749 // we never actually get here ... but just in case ... :-)
755 // Revision 1.26 1998/06/13 00:40:32 curt
756 // Tweaked fog command line options.
758 // Revision 1.25 1998/06/12 14:27:26 curt
759 // Pui -> PUI, Gui -> GUI.
761 // Revision 1.24 1998/06/12 00:57:39 curt
762 // Added support for Pui/Gui.
763 // Converted fog to GL_FOG_EXP2.
764 // Link to static simulator parts.
765 // Update runfg.bat to try to be a little smarter.
767 // Revision 1.23 1998/06/08 17:57:04 curt
768 // Minor sound/startup position tweaks.
770 // Revision 1.22 1998/06/05 18:18:40 curt
771 // A bit of fiddling with audio ...
773 // Revision 1.21 1998/06/03 22:01:06 curt
774 // Tweaking sound library usage.
776 // Revision 1.20 1998/06/03 00:47:11 curt
777 // Updated to compile in audio support if OSS available.
778 // Updated for new version of Steve's audio library.
779 // STL includes don't use .h
780 // Small view optimizations.
782 // Revision 1.19 1998/06/01 17:54:40 curt
783 // Added Linux audio support.
784 // avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
787 // Revision 1.18 1998/05/29 20:37:19 curt
788 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
789 // Read airport list into a "map" STL for dynamic list sizing and fast tree
792 // Revision 1.17 1998/05/22 21:28:52 curt
793 // Modifications to use the new fgEVENT_MGR class.
795 // Revision 1.16 1998/05/20 20:51:33 curt
796 // Tweaked smooth shaded texture lighting properties.
797 // Converted fgLIGHT to a C++ class.
799 // Revision 1.15 1998/05/16 13:08:34 curt
800 // C++ - ified views.[ch]xx
801 // Shuffled some additional view parameters into the fgVIEW class.
802 // Changed tile-radius to tile-diameter because it is a much better
804 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
805 // to transform world space to eye space for view frustum culling.
807 // Revision 1.14 1998/05/13 18:29:57 curt
808 // Added a keyboard binding to dynamically adjust field of view.
809 // Added a command line option to specify fov.
810 // Adjusted terrain color.
811 // Root path info moved to fgOPTIONS.
812 // Added ability to parse options out of a config file.
814 // Revision 1.13 1998/05/11 18:18:15 curt
815 // For flat shading use "glHint (GL_FOG_HINT, GL_FASTEST )"
817 // Revision 1.12 1998/05/07 23:14:15 curt
818 // Added "D" key binding to set autopilot heading.
819 // Made frame rate calculation average out over last 10 frames.
820 // Borland C++ floating point exception workaround.
821 // Added a --tile-radius=n option.
823 // Revision 1.11 1998/05/06 03:16:23 curt
824 // Added an averaged global frame rate counter.
825 // Added an option to control tile radius.
827 // Revision 1.10 1998/05/03 00:47:31 curt
828 // Added an option to enable/disable full-screen mode.
830 // Revision 1.9 1998/04/30 12:34:17 curt
831 // Added command line rendering options:
832 // enable/disable fog/haze
833 // specify smooth/flat shading
834 // disable sky blending and just use a solid color
835 // enable wireframe drawing mode
837 // Revision 1.8 1998/04/28 01:20:21 curt
838 // Type-ified fgTIME and fgVIEW.
839 // Added a command line option to disable textures.
841 // Revision 1.7 1998/04/26 05:10:02 curt
842 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
844 // Revision 1.6 1998/04/25 22:06:30 curt
845 // Edited cvs log messages in source files ... bad bad bad!
847 // Revision 1.5 1998/04/25 20:24:01 curt
848 // Cleaned up initialization sequence to eliminate interdependencies
849 // between sun position, lighting, and view position. This creates a
850 // valid single pass initialization path.
852 // Revision 1.4 1998/04/24 14:19:30 curt
855 // Revision 1.3 1998/04/24 00:49:18 curt
856 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
857 // Trying out some different option parsing code.
858 // Some code reorganization.
860 // Revision 1.2 1998/04/22 13:25:41 curt
861 // C++ - ifing the code.
862 // Starting a bit of reorganization of lighting code.
864 // Revision 1.1 1998/04/21 17:02:39 curt
865 // Prepairing for C++ integration.
867 // Revision 1.71 1998/04/18 04:11:26 curt
868 // Moved fg_debug to it's own library, added zlib support.
870 // Revision 1.70 1998/04/14 02:21:02 curt
871 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
872 // <jgoeke@voyager.net>
874 // Revision 1.69 1998/04/08 23:35:34 curt
875 // Tweaks to Gnu automake/autoconf system.
877 // Revision 1.68 1998/04/03 22:09:03 curt
878 // Converting to Gnu autoconf system.
880 // Revision 1.67 1998/03/23 21:24:37 curt
881 // Source code formating tweaks.
883 // Revision 1.66 1998/03/14 00:31:20 curt
884 // Beginning initial terrain texturing experiments.
886 // Revision 1.65 1998/03/09 22:45:57 curt
887 // Minor tweaks for building on sparc platform.
889 // Revision 1.64 1998/02/20 00:16:23 curt
890 // Thursday's tweaks.
892 // Revision 1.63 1998/02/16 16:17:39 curt
895 // Revision 1.62 1998/02/16 13:39:42 curt
896 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
897 // tiles to occasionally be missing.
899 // Revision 1.61 1998/02/12 21:59:46 curt
900 // Incorporated code changes contributed by Charlie Hotchkiss
901 // <chotchkiss@namg.us.anritsu.com>
903 // Revision 1.60 1998/02/11 02:50:40 curt
906 // Revision 1.59 1998/02/09 22:56:54 curt
907 // Removed "depend" files from cvs control. Other minor make tweaks.
909 // Revision 1.58 1998/02/09 15:07:49 curt
912 // Revision 1.57 1998/02/07 15:29:40 curt
913 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
914 // <chotchkiss@namg.us.anritsu.com>
916 // Revision 1.56 1998/02/03 23:20:23 curt
917 // Lots of little tweaks to fix various consistency problems discovered by
918 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
919 // passed arguments along to the real printf(). Also incorporated HUD changes
920 // by Michele America.
922 // Revision 1.55 1998/02/02 20:53:58 curt
923 // Incorporated Durk's changes.
925 // Revision 1.54 1998/01/31 00:43:10 curt
926 // Added MetroWorks patches from Carmen Volpe.
928 // Revision 1.53 1998/01/27 18:35:54 curt
931 // Revision 1.52 1998/01/27 00:47:56 curt
932 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
933 // system and commandline/config file processing code.
935 // Revision 1.51 1998/01/26 15:57:05 curt
936 // Tweaks for dynamic scenery development.
938 // Revision 1.50 1998/01/19 19:27:07 curt
939 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
940 // This should simplify things tremendously.
942 // Revision 1.49 1998/01/19 18:40:31 curt
943 // Tons of little changes to clean up the code and to remove fatal errors
944 // when building with the c++ compiler.
946 // Revision 1.48 1998/01/19 18:35:46 curt
947 // Minor tweaks and fixes for cygwin32.
949 // Revision 1.47 1998/01/13 00:23:08 curt
950 // Initial changes to support loading and management of scenery tiles. Note,
951 // there's still a fair amount of work left to be done.
953 // Revision 1.46 1998/01/08 02:22:06 curt
954 // Beginning to integrate Tile management subsystem.
956 // Revision 1.45 1998/01/07 03:18:55 curt
957 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
959 // Revision 1.44 1997/12/30 22:22:31 curt
960 // Further integration of event manager.
962 // Revision 1.43 1997/12/30 20:47:43 curt
963 // Integrated new event manager with subsystem initializations.
965 // Revision 1.42 1997/12/30 16:36:47 curt
966 // Merged in Durk's changes ...
968 // Revision 1.41 1997/12/30 13:06:56 curt
969 // A couple lighting tweaks ...
971 // Revision 1.40 1997/12/30 01:38:37 curt
972 // Switched back to per vertex normals and smooth shading for terrain.
974 // Revision 1.39 1997/12/22 23:45:45 curt
975 // First stab at sunset/sunrise sky glow effects.
977 // Revision 1.38 1997/12/22 04:14:28 curt
978 // Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
980 // Revision 1.37 1997/12/19 23:34:03 curt
981 // Lot's of tweaking with sky rendering and lighting.
983 // Revision 1.36 1997/12/19 16:44:57 curt
984 // Working on scene rendering order and options.
986 // Revision 1.35 1997/12/18 23:32:32 curt
987 // First stab at sky dome actually starting to look reasonable. :-)
989 // Revision 1.34 1997/12/17 23:13:34 curt
990 // Began working on rendering a sky.
992 // Revision 1.33 1997/12/15 23:54:45 curt
993 // Add xgl wrappers for debugging.
994 // Generate terrain normals on the fly.
996 // Revision 1.32 1997/12/15 20:59:08 curt
999 // Revision 1.31 1997/12/12 21:41:25 curt
1000 // More light/material property tweaking ... still a ways off.
1002 // Revision 1.30 1997/12/12 19:52:47 curt
1003 // Working on lightling and material properties.
1005 // Revision 1.29 1997/12/11 04:43:54 curt
1006 // Fixed sun vector and lighting problems. I thing the moon is now lit
1009 // Revision 1.28 1997/12/10 22:37:45 curt
1010 // Prepended "fg" on the name of all global structures that didn't have it yet.
1011 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
1013 // Revision 1.27 1997/12/09 05:11:54 curt
1014 // Working on tweaking lighting.
1016 // Revision 1.26 1997/12/09 04:25:29 curt
1017 // Working on adding a global lighting params structure.
1019 // Revision 1.25 1997/12/08 22:54:09 curt
1020 // Enabled GL_CULL_FACE.
1022 // Revision 1.24 1997/11/25 19:25:32 curt
1023 // Changes to integrate Durk's moon/sun code updates + clean up.
1025 // Revision 1.23 1997/11/15 18:16:34 curt
1028 // Revision 1.22 1997/10/30 12:38:41 curt
1029 // Working on new scenery subsystem.
1031 // Revision 1.21 1997/09/23 00:29:38 curt
1032 // Tweaks to get things to compile with gcc-win32.
1034 // Revision 1.20 1997/09/22 14:44:19 curt
1035 // Continuing to try to align stars correctly.
1037 // Revision 1.19 1997/09/18 16:20:08 curt
1038 // At dusk/dawn add/remove stars in stages.
1040 // Revision 1.18 1997/09/16 22:14:51 curt
1041 // Tweaked time of day lighting equations. Don't draw stars during the day.
1043 // Revision 1.17 1997/09/16 15:50:29 curt
1044 // Working on star alignment and time issues.
1046 // Revision 1.16 1997/09/13 02:00:06 curt
1047 // Mostly working on stars and generating sidereal time for accurate star
1050 // Revision 1.15 1997/09/05 14:17:27 curt
1051 // More tweaking with stars.
1053 // Revision 1.14 1997/09/05 01:35:53 curt
1054 // Working on getting stars right.
1056 // Revision 1.13 1997/09/04 02:17:34 curt
1059 // Revision 1.12 1997/08/27 21:32:24 curt
1060 // Restructured view calculation code. Added stars.
1062 // Revision 1.11 1997/08/27 03:30:16 curt
1063 // Changed naming scheme of basic shared structures.
1065 // Revision 1.10 1997/08/25 20:27:22 curt
1066 // Merged in initial HUD and Joystick code.
1068 // Revision 1.9 1997/08/22 21:34:39 curt
1069 // Doing a bit of reorganizing and house cleaning.
1071 // Revision 1.8 1997/08/19 23:55:03 curt
1072 // Worked on better simulating real lighting.
1074 // Revision 1.7 1997/08/16 12:22:38 curt
1075 // Working on improving the lighting/shading.
1077 // Revision 1.6 1997/08/13 20:24:56 curt
1078 // Changes due to changing sunpos interface.
1080 // Revision 1.5 1997/08/06 21:08:32 curt
1081 // Sun position now really* works (I think) ... I still have sun time warping
1082 // code in place, probably should remove it soon.
1084 // Revision 1.4 1997/08/06 15:41:26 curt
1085 // Working on correct sun position.
1087 // Revision 1.3 1997/08/06 00:24:22 curt
1088 // Working on correct real time sun lighting.
1090 // Revision 1.2 1997/08/04 20:25:15 curt
1091 // Organizational tweaking.
1093 // Revision 1.1 1997/08/02 18:45:00 curt
1094 // Renamed GLmain.c GLUTmain.c
1096 // Revision 1.43 1997/08/02 16:23:47 curt
1099 // Revision 1.42 1997/08/01 19:43:33 curt
1100 // Making progress with coordinate system overhaul.
1102 // Revision 1.41 1997/07/31 22:52:37 curt
1103 // Working on redoing internal coordinate systems & scenery transformations.
1105 // Revision 1.40 1997/07/30 16:12:42 curt
1106 // Moved fg_random routines from Util/ to Math/
1108 // Revision 1.39 1997/07/21 14:45:01 curt
1111 // Revision 1.38 1997/07/19 23:04:47 curt
1112 // Added an initial weather section.
1114 // Revision 1.37 1997/07/19 22:34:02 curt
1115 // Moved PI definitions to ../constants.h
1116 // Moved random() stuff to ../Utils/ and renamed fg_random()
1118 // Revision 1.36 1997/07/18 23:41:25 curt
1119 // Tweaks for building with Cygnus Win32 compiler.
1121 // Revision 1.35 1997/07/18 14:28:34 curt
1122 // Hacked in some support for wind/turbulence.
1124 // Revision 1.34 1997/07/16 20:04:48 curt
1125 // Minor tweaks to aid Win32 port.
1127 // Revision 1.33 1997/07/12 03:50:20 curt
1128 // Added an #include <Windows32/Base.h> to help compiling for Win32
1130 // Revision 1.32 1997/07/11 03:23:18 curt
1131 // Solved some scenery display/orientation problems. Still have a positioning
1132 // (or transformation?) problem.
1134 // Revision 1.31 1997/07/11 01:29:58 curt
1135 // More tweaking of terrian floor.
1137 // Revision 1.30 1997/07/10 04:26:37 curt
1138 // We now can interpolated ground elevation for any position in the grid. We
1139 // can use this to enforce a "hard" ground. We still need to enforce some
1140 // bounds checking so that we don't try to lookup data points outside the
1143 // Revision 1.29 1997/07/09 21:31:12 curt
1144 // Working on making the ground "hard."
1146 // Revision 1.28 1997/07/08 18:20:12 curt
1147 // Working on establishing a hard ground.
1149 // Revision 1.27 1997/07/07 20:59:49 curt
1150 // Working on scenery transformations to enable us to fly fluidly over the
1151 // poles with no discontinuity/distortion in scenery.
1153 // Revision 1.26 1997/07/05 20:43:34 curt
1154 // renamed mat3 directory to Math so we could add other math related routines.
1156 // Revision 1.25 1997/06/29 21:19:17 curt
1157 // Working on scenery management system.
1159 // Revision 1.24 1997/06/26 22:14:53 curt
1160 // Beginning work on a scenery management system.
1162 // Revision 1.23 1997/06/26 19:08:33 curt
1163 // Restructuring make, adding automatic "make dep" support.
1165 // Revision 1.22 1997/06/25 15:39:47 curt
1166 // Minor changes to compile with rsxnt/win32.
1168 // Revision 1.21 1997/06/22 21:44:41 curt
1169 // Working on intergrating the VRML (subset) parser.
1171 // Revision 1.20 1997/06/21 17:12:53 curt
1172 // Capitalized subdirectory names.
1174 // Revision 1.19 1997/06/18 04:10:31 curt
1175 // A couple more runway tweaks ...
1177 // Revision 1.18 1997/06/18 02:21:24 curt
1178 // Hacked in a runway
1180 // Revision 1.17 1997/06/17 16:51:58 curt
1181 // Timer interval stuff now uses gettimeofday() instead of ftime()
1183 // Revision 1.16 1997/06/17 04:19:16 curt
1184 // More timer related tweaks with respect to view direction changes.
1186 // Revision 1.15 1997/06/17 03:41:10 curt
1187 // Nonsignal based interval timing is now working.
1188 // This would be a good time to look at cleaning up the code structure a bit.
1190 // Revision 1.14 1997/06/16 19:32:51 curt
1191 // Starting to add general timer support.
1193 // Revision 1.13 1997/06/02 03:40:06 curt
1194 // A tiny bit more view tweaking.
1196 // Revision 1.12 1997/06/02 03:01:38 curt
1197 // Working on views (side, front, back, transitions, etc.)
1199 // Revision 1.11 1997/05/31 19:16:25 curt
1200 // Elevator trim added.
1202 // Revision 1.10 1997/05/31 04:13:52 curt
1203 // WE CAN NOW FLY!!!
1205 // Continuing work on the LaRCsim flight model integration.
1206 // Added some MSFS-like keyboard input handling.
1208 // Revision 1.9 1997/05/30 19:27:01 curt
1209 // The LaRCsim flight model is starting to look like it is working.
1211 // Revision 1.8 1997/05/30 03:54:10 curt
1212 // Made a bit more progress towards integrating the LaRCsim flight model.
1214 // Revision 1.7 1997/05/29 22:39:49 curt
1215 // Working on incorporating the LaRCsim flight model.
1217 // Revision 1.6 1997/05/29 12:31:39 curt
1218 // Minor tweaks, moving towards general flight model integration.
1220 // Revision 1.5 1997/05/29 02:33:23 curt
1221 // Updated to reflect changing interfaces in other "modules."
1223 // Revision 1.4 1997/05/27 17:44:31 curt
1224 // Renamed & rearranged variables and routines. Added some initial simple
1225 // timer/alarm routines so the flight model can be updated on a regular
1228 // Revision 1.3 1997/05/23 15:40:25 curt
1229 // Added GNU copyright headers.
1232 // Revision 1.2 1997/05/23 00:35:12 curt
1233 // Trying to get fog to work ...
1235 // Revision 1.1 1997/05/21 15:57:51 curt
1236 // Renamed due to added GLUT support.
1238 // Revision 1.3 1997/05/19 18:22:42 curt
1239 // Parameter tweaking ... starting to stub in fog support.
1241 // Revision 1.2 1997/05/17 00:17:34 curt
1242 // Trying to stub in support for standard OpenGL.
1244 // Revision 1.1 1997/05/16 16:05:52 curt
1245 // Initial revision.