2 // GLUTmain.cxx -- top level sim routines
4 // Written by Curtis Olson for OpenGL, started May 1997.
6 // Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU General Public License as
10 // published by the Free Software Foundation; either version 2 of the
11 // License, or (at your option) any later version.
13 // This program is distributed in the hope that it will be useful, but
14 // WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // General Public License for more details.
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 // (Log is kept at end of this file)
44 #include <Include/fg_constants.h> // for VERSION
45 #include <Include/general.h>
47 #include <Aircraft/aircraft.h>
48 #include <Astro/moon.hxx>
49 #include <Astro/planets.hxx>
50 #include <Astro/sky.hxx>
51 #include <Astro/stars.hxx>
52 #include <Astro/sun.hxx>
53 #include <Cockpit/cockpit.hxx>
54 #include <Debug/fg_debug.h>
55 #include <Joystick/joystick.h>
56 #include <Math/fg_geodesy.h>
57 #include <Math/mat3.h>
58 #include <Math/polar3d.h>
59 #include <Scenery/scenery.hxx>
60 #include <Scenery/tilemgr.hxx>
61 #include <Time/event.hxx>
62 #include <Time/fg_time.hxx>
63 #include <Time/fg_timer.hxx>
64 #include <Time/sunpos.hxx>
65 #include <Weather/weather.h>
67 #include "GLUTkey.hxx"
68 #include "fg_init.hxx"
69 #include "options.hxx"
73 // This is a record containing global housekeeping information
79 // Yet another other hack. Used for my prototype instrument code. (Durk)
80 int displayInstruments;
83 // The following defines flight gear options. Because glutlib will also
84 // want to parse its own options, those options must not be included here
85 // or they will get parsed by the main program option parser. Hence case
86 // is significant for any option added that might be in conflict with
89 // glutlib parses for:
91 // -direct (invalid in Win32)
95 // -indirect (invalid in Win32)
98 // Note that glutlib depends upon strings while this program's
99 // option parser wants only initial characters followed by numbers
102 const char *fg_cmdargopts = "a:c:Hhp:r:v:x:?";
105 // -a aircraftfilename aircraft start over ride
106 // -c0x0000 - 0xffffffff debug class setting
107 // H,h.? help on command line use (does not need Option struct)
109 // -r flightgear root path to program support files
110 // -v0 -v1 initial view mode (hud/no_hud currently)
111 // -xlogpathname debug logfile name
113 // Defaults in arguments to indicate not set on command line.
114 // Program defaults set variables from constants if neither command
115 // options or environmental variables effect values.
118 char acArgbuf [ MAXPATH + 1] = "\0";
119 int debugArgValue = -2;
120 int priorityArgValue = -1;
121 char rootArgbuf [ MAXPATH + 1] = "\0";
123 char logArgbuf [ MAXPATH + 1] = "\0";
125 // There is a reason for defining the option structs by name and then
126 // creating an array of pointers to options. C++ is unfriendly to
127 // initializing arrays of objects that are not built in types. Always
128 // look forward. (Besides, you can follow what is going on better and
129 // add or modify with greater security. -ch
131 Option aircraftOption = { 'a',
134 "Startup aircraft pathname override"
136 Option debugOption = { 'c',
137 OPT_LHEX, // Long int (32 bits)
141 Option priorityOption = { 'p',
144 "Debug priority Threshold"
146 Option rootOption = { 'r',
149 "Root directory for execution"
151 Option hudOption = { 'v',
154 "View mode start" // Naked,HUD,Panel,Chase,Tower...
157 // Only naked view and HUD are implemented at this time
158 Option logfileOption = { 'x',
161 "Debug log file name"
164 #define OptsDefined 6
165 Option *CmdLineOptions[ OptsDefined ] = {
174 const char *DefaultRootDir = "\\Flightgear";
175 const char *DefaultAircraft = "Navion.acf";
176 const char *DefaultDebuglog = "fgdebug.log";
177 const int DefaultViewMode = HUD_VIEW;
180 // Debug defaults handled in fg_debug.c
182 // fgInitVisuals() -- Initialize various GL/view parameters
183 static void fgInitVisuals( void ) {
188 l = &cur_light_params;
189 o = ¤t_options;
190 w = ¤t_weather;
192 // Go full screen if requested ...
193 if ( o->fullscreen ) {
197 // If enabled, normal vectors specified with glNormal are scaled
198 // to unit length after transformation. See glNormal.
199 xglEnable( GL_NORMALIZE );
201 xglEnable( GL_LIGHTING );
202 xglEnable( GL_LIGHT0 );
203 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
205 xglFogi (GL_FOG_MODE, GL_LINEAR);
206 xglFogf (GL_FOG_START, w->visibility / 1000000.0 );
207 xglFogf (GL_FOG_END, w->visibility);
208 // xglFogf (GL_FOG_DENSITY, w->visibility);
210 xglHint (GL_FOG_HINT, GL_NICEST );
212 xglHint (GL_FOG_HINT, GL_FASTEST );
214 if ( o->wireframe ) {
216 xglPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
219 // This is the default anyways, but it can't hurt
220 xglFrontFace ( GL_CCW );
224 // Update the view volume, position, and orientation
225 static void fgUpdateViewParams( void ) {
231 f = current_aircraft.flight;
232 l = &cur_light_params;
233 o = ¤t_options;
237 v->UpdateWorldToEye(f);
239 if (displayInstruments) {
240 xglViewport( 0, (GLint)((v->winHeight) / 2 ) ,
241 (GLint)(v->winWidth), (GLint)(v->winHeight) / 2 );
242 // Tell GL we are about to modify the projection parameters
243 xglMatrixMode(GL_PROJECTION);
245 gluPerspective(o->fov, v->win_ratio / 2.0, 1.0, 100000.0);
247 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) );
248 // Tell GL we are about to modify the projection parameters
249 xglMatrixMode(GL_PROJECTION);
251 gluPerspective(o->fov, v->win_ratio, 10.0, 100000.0);
254 xglMatrixMode(GL_MODELVIEW);
257 // set up our view volume (default)
258 gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
259 v->view_pos.x + v->view_forward[0],
260 v->view_pos.y + v->view_forward[1],
261 v->view_pos.z + v->view_forward[2],
262 v->view_up[0], v->view_up[1], v->view_up[2]);
264 // look almost straight up (testing and eclipse watching)
265 /* gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
266 v->view_pos.x + v->view_up[0] + .001,
267 v->view_pos.y + v->view_up[1] + .001,
268 v->view_pos.z + v->view_up[2] + .001,
269 v->view_up[0], v->view_up[1], v->view_up[2]); */
271 // lock view horizontally towards sun (testing)
272 /* gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
273 v->view_pos.x + v->surface_to_sun[0],
274 v->view_pos.y + v->surface_to_sun[1],
275 v->view_pos.z + v->surface_to_sun[2],
276 v->view_up[0], v->view_up[1], v->view_up[2]); */
278 // lock view horizontally towards south (testing)
279 /* gluLookAt(v->view_pos.x, v->view_pos.y, v->view_pos.z,
280 v->view_pos.x + v->surface_south[0],
281 v->view_pos.y + v->surface_south[1],
282 v->view_pos.z + v->surface_south[2],
283 v->view_up[0], v->view_up[1], v->view_up[2]); */
285 // set the sun position
286 xglLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
290 // Draw a basic instrument panel
291 static void fgUpdateInstrViewParams( void ) {
296 xglViewport(0, 0 , (GLint)(v->winWidth), (GLint)(v->winHeight) / 2);
298 xglMatrixMode(GL_PROJECTION);
302 gluOrtho2D(0, 640, 0, 480);
303 xglMatrixMode(GL_MODELVIEW);
307 xglColor3f(1.0, 1.0, 1.0);
310 xglDisable(GL_DEPTH_TEST);
311 xglDisable(GL_LIGHTING);
314 xglColor3f (0.5, 0.5, 0.5);
317 xglVertex2f(0.0, 0.00);
318 xglVertex2f(0.0, 480.0);
319 xglVertex2f(640.0,480.0);
320 xglVertex2f(640.0, 0.0);
323 xglRectf(0.0,0.0, 640, 480);
324 xglEnable(GL_DEPTH_TEST);
325 xglEnable(GL_LIGHTING);
326 xglMatrixMode(GL_PROJECTION);
328 xglMatrixMode(GL_MODELVIEW);
333 // Update all Visuals (redraws anything graphics related)
334 static void fgRenderFrame( void ) {
340 GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
341 GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
342 GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
344 l = &cur_light_params;
345 o = ¤t_options;
346 t = &cur_time_params;
349 // update view volume parameters
350 fgUpdateViewParams();
353 glClearColor(black[0], black[1], black[2], black[3]);
355 glClearColor(l->sky_color[0], l->sky_color[1],
356 l->sky_color[2], l->sky_color[3]);
358 xglClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
360 // Tell GL we are switching to model view parameters
361 xglMatrixMode(GL_MODELVIEW);
362 // xglLoadIdentity();
365 xglDisable( GL_DEPTH_TEST );
366 xglDisable( GL_LIGHTING );
367 xglDisable( GL_CULL_FACE );
368 xglDisable( GL_FOG );
369 xglShadeModel( GL_SMOOTH );
374 // setup transformation for drawing astronomical objects
376 // Translate to view position
377 xglTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
378 // Rotate based on gst (sidereal time)
379 angle = t->gst * 15.041085; /* should be 15.041085, Curt thought it was 15*/
380 // printf("Rotating astro objects by %.2f degrees\n",angle);
381 xglRotatef( angle, 0.0, 0.0, -1.0 );
383 // draw stars and planets
391 xglEnable( GL_LIGHTING );
392 // set lighting parameters
393 xglLightfv(GL_LIGHT0, GL_AMBIENT, white );
394 xglLightfv(GL_LIGHT0, GL_DIFFUSE, white );
395 xglEnable( GL_CULL_FACE );
397 // Let's try some blending technique's (Durk)
399 glBlendFunc(GL_ONE, GL_ONE);
407 xglShadeModel( GL_SMOOTH );
409 xglShadeModel( GL_FLAT );
411 xglEnable( GL_DEPTH_TEST );
414 xglFogfv (GL_FOG_COLOR, l->fog_color);
416 // set lighting parameters
417 xglLightfv(GL_LIGHT0, GL_AMBIENT, l->scene_ambient );
418 xglLightfv(GL_LIGHT0, GL_DIFFUSE, l->scene_diffuse );
421 // texture parameters
422 xglEnable( GL_TEXTURE_2D );
423 xglTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT ) ;
424 xglTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT ) ;
425 xglTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ) ;
426 xglTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
427 GL_LINEAR /* GL_LINEAR_MIPMAP_LINEAR */ ) ;
428 xglTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
429 xglHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
430 // set base color (I don't think this is doing anything here)
431 xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
432 xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
434 xglDisable( GL_TEXTURE_2D );
435 // xglMaterialfv (GL_FRONT, GL_AMBIENT, terrain_color);
436 // xglMaterialfv (GL_FRONT, GL_DIFFUSE, terrain_color);
437 xglMaterialfv (GL_FRONT, GL_AMBIENT, white);
438 xglMaterialfv (GL_FRONT, GL_DIFFUSE, white);
443 xglDisable( GL_TEXTURE_2D );
446 if( o->hud_status ) {
450 // display instruments
451 if (displayInstruments) {
452 fgUpdateInstrViewParams();
459 // Update internal time dependent calculations (i.e. flight model)
460 void fgUpdateTimeDepCalcs(int multi_loop) {
466 f = current_aircraft.flight;
467 t = &cur_time_params;
470 // update the flight model
471 if ( multi_loop < 0 ) {
472 multi_loop = DEFAULT_MULTILOOP;
475 // printf("updating flight model x %d\n", multi_loop);
476 fgFlightModelUpdate(FG_LARCSIM, f, multi_loop);
478 // update the view angle
479 for ( i = 0; i < multi_loop; i++ ) {
480 if ( fabs(v->goal_view_offset - v->view_offset) < 0.05 ) {
481 v->view_offset = v->goal_view_offset;
484 // move v->view_offset towards v->goal_view_offset
485 if ( v->goal_view_offset > v->view_offset ) {
486 if ( v->goal_view_offset - v->view_offset < FG_PI ) {
487 v->view_offset += 0.01;
489 v->view_offset -= 0.01;
492 if ( v->view_offset - v->goal_view_offset < FG_PI ) {
493 v->view_offset -= 0.01;
495 v->view_offset += 0.01;
498 if ( v->view_offset > FG_2PI ) {
499 v->view_offset -= FG_2PI;
500 } else if ( v->view_offset < 0 ) {
501 v->view_offset += FG_2PI;
508 void fgInitTimeDepCalcs( void ) {
511 #ifdef HAVE_SETITIMER
512 fgTimerInit( 1.0 / DEFAULT_TIMER_HZ, fgUpdateTimeDepCalcs );
513 #endif HAVE_SETITIMER
518 // What should we do when we have nothing else to do? Let's get ready
519 // for the next move and update the display?
520 static void fgMainLoop( void ) {
525 static int remainder = 0;
526 int elapsed, multi_loop;
530 // double joy_x, joy_y;
531 // int joy_b1, joy_b2;
533 a = ¤t_aircraft;
536 t = &cur_time_params;
538 fgPrintf( FG_ALL, FG_DEBUG, "Running Main Loop\n");
539 fgPrintf( FG_ALL, FG_DEBUG, "======= ==== ====\n");
545 /* fgJoystickRead( &joy_x, &joy_y, &joy_b1, &joy_b2 );
546 printf( "Joystick X %f Y %f B1 %d B2 %d\n",
547 joy_x, joy_y, joy_b1, joy_b2 );
549 fgAileronSet( joy_x ); */
551 // Get elapsed time for this past frame
552 elapsed = fgGetTimeInterval();
553 fgPrintf( FG_ALL, FG_BULK,
554 "Time interval is = %d, previous remainder is = %d\n",
557 // Calculate frame rate average
558 if ( elapsed > 0.0 ) {
560 for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
561 accum += g->frames[i];
562 // printf("frame[%d] = %.2f\n", i, g->frames[i]);
563 g->frames[i+1] = g->frames[i];
565 g->frames[0] = 1000.0 / (float)elapsed;
566 // printf("frame[0] = %.2f\n", g->frames[0]);
567 accum += g->frames[0];
568 g->frame_rate = accum / (float)FG_FRAME_RATE_HISTORY;
569 // printf("ave = %.2f\n", g->frame_rate);
572 // Calculate model iterations needed for next frame
573 fgPrintf( FG_ALL, FG_DEBUG,
574 "--> Frame rate is = %.2f\n", g->frame_rate);
575 elapsed += remainder;
577 multi_loop = (int)(((float)elapsed * 0.001) * DEFAULT_MODEL_HZ);
578 remainder = elapsed - ((multi_loop*1000) / DEFAULT_MODEL_HZ);
579 fgPrintf( FG_ALL, FG_BULK,
580 "Model iterations needed = %d, new remainder = %d\n",
581 multi_loop, remainder);
584 if ( ! use_signals ) {
586 fgUpdateTimeDepCalcs(multi_loop);
589 // I'm just sticking this here for now, it should probably move
591 /* cur_elev = mesh_altitude(FG_Longitude * RAD_TO_ARCSEC,
592 FG_Latitude * RAD_TO_ARCSEC); */
593 // there is no ground collision detection really, so for now I
594 // just hard code the ground elevation to be 0 */
597 // printf("Ground elevation is %.2f meters here.\n", cur_elev);
598 // FG_Runway_altitude = cur_elev * METER_TO_FEET;
600 if ( FG_Altitude * FEET_TO_METER < cur_elev + 3.758099) {
601 // set this here, otherwise if we set runway height above our
602 // current height we get a really nasty bounce.
603 FG_Runway_altitude = FG_Altitude - 3.758099;
605 // now set aircraft altitude above ground
606 FG_Altitude = cur_elev * METER_TO_FEET + 3.758099;
607 fgPrintf( FG_ALL, FG_BULK, "<*> resetting altitude to %.0f meters\n",
608 FG_Altitude * FEET_TO_METER);
611 fgAircraftOutputCurrent(a);
613 // see if we need to load any new scenery tiles
616 // Process/manage pending events
617 global_events.Process();
622 fgPrintf( FG_ALL, FG_DEBUG, "\n");
626 // Handle new window size or exposure
627 static void fgReshape( int width, int height ) {
632 // Do this so we can call fgReshape(0,0) ourselves without having
633 // to know what the values of width & height are.
634 if ( (height > 0) && (width > 0) ) {
635 v->win_ratio = (GLfloat) width / (GLfloat) height;
639 v->winHeight = height;
641 // Inform gl of our view window size (now handled elsewhere)
642 // xglViewport(0, 0, (GLint)width, (GLint)height);
643 fgUpdateViewParams();
645 // xglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
649 // Initialize GLUT and define a main window
650 int fgGlutInit( int *argc, char **argv ) {
651 // GLUT will extract all glut specific options so later on we only
652 // need wory about our own.
653 xglutInit(argc, argv);
655 // Define Display Parameters
656 xglutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
658 // Define initial window size
659 xglutInitWindowSize(640, 480);
661 // Initialize windows
662 xglutCreateWindow("Flight Gear");
668 // Initialize GLUT event handlers
669 int fgGlutInitEvents( void ) {
670 // call fgReshape() on window resizes
671 xglutReshapeFunc( fgReshape );
673 // call GLUTkey() on keyboard event
674 xglutKeyboardFunc( GLUTkey );
675 glutSpecialFunc( GLUTspecialkey );
677 // call fgMainLoop() whenever there is
678 // nothing else to do
679 xglutIdleFunc( fgMainLoop );
682 xglutDisplayFunc( fgRenderFrame );
689 int main( int argc, char **argv ) {
693 int result; // Used in command line argument.
695 f = current_aircraft.flight;
696 o = ¤t_options;
699 _control87(MCW_EM, MCW_EM); /* defined in float.h */
702 // Initialize the debugging output system
705 fgPrintf(FG_GENERAL, FG_INFO, "Flight Gear: Version %s\n\n", VERSION);
707 // Initialize the Window/Graphics environment.
708 if( !fgGlutInit(&argc, argv) ) {
709 fgPrintf( FG_GENERAL, FG_EXIT, "GLUT initialization failed ...\n" );
712 // Attempt to locate and parse a config file
713 // First check fg_root
714 strcpy(config, o->fg_root);
715 strcat(config, "/system.fgfsrc");
716 result = o->parse_config_file(config);
718 // Next check home directory
719 if ( getenv("HOME") != NULL ) {
720 strcpy(config, getenv("HOME"));
721 strcat(config, "/.fgfsrc");
722 result = o->parse_config_file(config);
725 // Parse remaining command line options
726 // These will override anything specified in a config file
727 result = o->parse_command_line(argc, argv);
728 if ( result != FG_OPTIONS_OK ) {
729 // Something must have gone horribly wrong with the command
730 // line parsing or maybe the user just requested help ... :-)
732 fgPrintf( FG_GENERAL, FG_EXIT, "\nExiting ...\n");
735 // These are a few miscellaneous things that aren't really
736 // "subsystems" but still need to be initialized.
737 if( !fgInitGeneral()) {
738 fgPrintf( FG_GENERAL, FG_EXIT, "General initializations failed ...\n" );
741 // This is the top level init routine which calls all the other
742 // subsystem initialization routines. If you are adding a
743 // subsystem to flight gear, its initialization call should
744 // located in this routine.
745 if( !fgInitSubsystems()) {
746 fgPrintf( FG_GENERAL, FG_EXIT,
747 "Subsystem initializations failed ...\n" );
750 // setup OpenGL view parameters
754 // init timer routines, signals, etc. Arrange for an alarm
755 // signal to be generated, etc.
756 fgInitTimeDepCalcs();
759 // Initialize the various GLUT Event Handlers.
760 if( !fgGlutInitEvents() ) {
761 fgPrintf( FG_GENERAL, FG_EXIT,
762 "GLUT event handler initialization failed ...\n" );
765 // pass control off to the master GLUT event handler
768 // we never actually get here ... but just in case ... :-)
775 void __eprintf( void ) {
782 // Revision 1.18 1998/05/29 20:37:19 curt
783 // Tweaked material properties & lighting a bit in GLUTmain.cxx.
784 // Read airport list into a "map" STL for dynamic list sizing and fast tree
787 // Revision 1.17 1998/05/22 21:28:52 curt
788 // Modifications to use the new fgEVENT_MGR class.
790 // Revision 1.16 1998/05/20 20:51:33 curt
791 // Tweaked smooth shaded texture lighting properties.
792 // Converted fgLIGHT to a C++ class.
794 // Revision 1.15 1998/05/16 13:08:34 curt
795 // C++ - ified views.[ch]xx
796 // Shuffled some additional view parameters into the fgVIEW class.
797 // Changed tile-radius to tile-diameter because it is a much better
799 // Added a WORLD_TO_EYE transformation to views.cxx. This allows us
800 // to transform world space to eye space for view frustum culling.
802 // Revision 1.14 1998/05/13 18:29:57 curt
803 // Added a keyboard binding to dynamically adjust field of view.
804 // Added a command line option to specify fov.
805 // Adjusted terrain color.
806 // Root path info moved to fgOPTIONS.
807 // Added ability to parse options out of a config file.
809 // Revision 1.13 1998/05/11 18:18:15 curt
810 // For flat shading use "glHint (GL_FOG_HINT, GL_FASTEST )"
812 // Revision 1.12 1998/05/07 23:14:15 curt
813 // Added "D" key binding to set autopilot heading.
814 // Made frame rate calculation average out over last 10 frames.
815 // Borland C++ floating point exception workaround.
816 // Added a --tile-radius=n option.
818 // Revision 1.11 1998/05/06 03:16:23 curt
819 // Added an averaged global frame rate counter.
820 // Added an option to control tile radius.
822 // Revision 1.10 1998/05/03 00:47:31 curt
823 // Added an option to enable/disable full-screen mode.
825 // Revision 1.9 1998/04/30 12:34:17 curt
826 // Added command line rendering options:
827 // enable/disable fog/haze
828 // specify smooth/flat shading
829 // disable sky blending and just use a solid color
830 // enable wireframe drawing mode
832 // Revision 1.8 1998/04/28 01:20:21 curt
833 // Type-ified fgTIME and fgVIEW.
834 // Added a command line option to disable textures.
836 // Revision 1.7 1998/04/26 05:10:02 curt
837 // "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
839 // Revision 1.6 1998/04/25 22:06:30 curt
840 // Edited cvs log messages in source files ... bad bad bad!
842 // Revision 1.5 1998/04/25 20:24:01 curt
843 // Cleaned up initialization sequence to eliminate interdependencies
844 // between sun position, lighting, and view position. This creates a
845 // valid single pass initialization path.
847 // Revision 1.4 1998/04/24 14:19:30 curt
850 // Revision 1.3 1998/04/24 00:49:18 curt
851 // Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
852 // Trying out some different option parsing code.
853 // Some code reorganization.
855 // Revision 1.2 1998/04/22 13:25:41 curt
856 // C++ - ifing the code.
857 // Starting a bit of reorganization of lighting code.
859 // Revision 1.1 1998/04/21 17:02:39 curt
860 // Prepairing for C++ integration.
862 // Revision 1.71 1998/04/18 04:11:26 curt
863 // Moved fg_debug to it's own library, added zlib support.
865 // Revision 1.70 1998/04/14 02:21:02 curt
866 // Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
867 // <jgoeke@voyager.net>
869 // Revision 1.69 1998/04/08 23:35:34 curt
870 // Tweaks to Gnu automake/autoconf system.
872 // Revision 1.68 1998/04/03 22:09:03 curt
873 // Converting to Gnu autoconf system.
875 // Revision 1.67 1998/03/23 21:24:37 curt
876 // Source code formating tweaks.
878 // Revision 1.66 1998/03/14 00:31:20 curt
879 // Beginning initial terrain texturing experiments.
881 // Revision 1.65 1998/03/09 22:45:57 curt
882 // Minor tweaks for building on sparc platform.
884 // Revision 1.64 1998/02/20 00:16:23 curt
885 // Thursday's tweaks.
887 // Revision 1.63 1998/02/16 16:17:39 curt
890 // Revision 1.62 1998/02/16 13:39:42 curt
891 // Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
892 // tiles to occasionally be missing.
894 // Revision 1.61 1998/02/12 21:59:46 curt
895 // Incorporated code changes contributed by Charlie Hotchkiss
896 // <chotchkiss@namg.us.anritsu.com>
898 // Revision 1.60 1998/02/11 02:50:40 curt
901 // Revision 1.59 1998/02/09 22:56:54 curt
902 // Removed "depend" files from cvs control. Other minor make tweaks.
904 // Revision 1.58 1998/02/09 15:07:49 curt
907 // Revision 1.57 1998/02/07 15:29:40 curt
908 // Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
909 // <chotchkiss@namg.us.anritsu.com>
911 // Revision 1.56 1998/02/03 23:20:23 curt
912 // Lots of little tweaks to fix various consistency problems discovered by
913 // Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
914 // passed arguments along to the real printf(). Also incorporated HUD changes
915 // by Michele America.
917 // Revision 1.55 1998/02/02 20:53:58 curt
918 // Incorporated Durk's changes.
920 // Revision 1.54 1998/01/31 00:43:10 curt
921 // Added MetroWorks patches from Carmen Volpe.
923 // Revision 1.53 1998/01/27 18:35:54 curt
926 // Revision 1.52 1998/01/27 00:47:56 curt
927 // Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
928 // system and commandline/config file processing code.
930 // Revision 1.51 1998/01/26 15:57:05 curt
931 // Tweaks for dynamic scenery development.
933 // Revision 1.50 1998/01/19 19:27:07 curt
934 // Merged in make system changes from Bob Kuehne <rpk@sgi.com>
935 // This should simplify things tremendously.
937 // Revision 1.49 1998/01/19 18:40:31 curt
938 // Tons of little changes to clean up the code and to remove fatal errors
939 // when building with the c++ compiler.
941 // Revision 1.48 1998/01/19 18:35:46 curt
942 // Minor tweaks and fixes for cygwin32.
944 // Revision 1.47 1998/01/13 00:23:08 curt
945 // Initial changes to support loading and management of scenery tiles. Note,
946 // there's still a fair amount of work left to be done.
948 // Revision 1.46 1998/01/08 02:22:06 curt
949 // Beginning to integrate Tile management subsystem.
951 // Revision 1.45 1998/01/07 03:18:55 curt
952 // Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
954 // Revision 1.44 1997/12/30 22:22:31 curt
955 // Further integration of event manager.
957 // Revision 1.43 1997/12/30 20:47:43 curt
958 // Integrated new event manager with subsystem initializations.
960 // Revision 1.42 1997/12/30 16:36:47 curt
961 // Merged in Durk's changes ...
963 // Revision 1.41 1997/12/30 13:06:56 curt
964 // A couple lighting tweaks ...
966 // Revision 1.40 1997/12/30 01:38:37 curt
967 // Switched back to per vertex normals and smooth shading for terrain.
969 // Revision 1.39 1997/12/22 23:45:45 curt
970 // First stab at sunset/sunrise sky glow effects.
972 // Revision 1.38 1997/12/22 04:14:28 curt
973 // Aligned sky with sun so dusk/dawn effects can be correct relative to the sun.
975 // Revision 1.37 1997/12/19 23:34:03 curt
976 // Lot's of tweaking with sky rendering and lighting.
978 // Revision 1.36 1997/12/19 16:44:57 curt
979 // Working on scene rendering order and options.
981 // Revision 1.35 1997/12/18 23:32:32 curt
982 // First stab at sky dome actually starting to look reasonable. :-)
984 // Revision 1.34 1997/12/17 23:13:34 curt
985 // Began working on rendering a sky.
987 // Revision 1.33 1997/12/15 23:54:45 curt
988 // Add xgl wrappers for debugging.
989 // Generate terrain normals on the fly.
991 // Revision 1.32 1997/12/15 20:59:08 curt
994 // Revision 1.31 1997/12/12 21:41:25 curt
995 // More light/material property tweaking ... still a ways off.
997 // Revision 1.30 1997/12/12 19:52:47 curt
998 // Working on lightling and material properties.
1000 // Revision 1.29 1997/12/11 04:43:54 curt
1001 // Fixed sun vector and lighting problems. I thing the moon is now lit
1004 // Revision 1.28 1997/12/10 22:37:45 curt
1005 // Prepended "fg" on the name of all global structures that didn't have it yet.
1006 // i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
1008 // Revision 1.27 1997/12/09 05:11:54 curt
1009 // Working on tweaking lighting.
1011 // Revision 1.26 1997/12/09 04:25:29 curt
1012 // Working on adding a global lighting params structure.
1014 // Revision 1.25 1997/12/08 22:54:09 curt
1015 // Enabled GL_CULL_FACE.
1017 // Revision 1.24 1997/11/25 19:25:32 curt
1018 // Changes to integrate Durk's moon/sun code updates + clean up.
1020 // Revision 1.23 1997/11/15 18:16:34 curt
1023 // Revision 1.22 1997/10/30 12:38:41 curt
1024 // Working on new scenery subsystem.
1026 // Revision 1.21 1997/09/23 00:29:38 curt
1027 // Tweaks to get things to compile with gcc-win32.
1029 // Revision 1.20 1997/09/22 14:44:19 curt
1030 // Continuing to try to align stars correctly.
1032 // Revision 1.19 1997/09/18 16:20:08 curt
1033 // At dusk/dawn add/remove stars in stages.
1035 // Revision 1.18 1997/09/16 22:14:51 curt
1036 // Tweaked time of day lighting equations. Don't draw stars during the day.
1038 // Revision 1.17 1997/09/16 15:50:29 curt
1039 // Working on star alignment and time issues.
1041 // Revision 1.16 1997/09/13 02:00:06 curt
1042 // Mostly working on stars and generating sidereal time for accurate star
1045 // Revision 1.15 1997/09/05 14:17:27 curt
1046 // More tweaking with stars.
1048 // Revision 1.14 1997/09/05 01:35:53 curt
1049 // Working on getting stars right.
1051 // Revision 1.13 1997/09/04 02:17:34 curt
1054 // Revision 1.12 1997/08/27 21:32:24 curt
1055 // Restructured view calculation code. Added stars.
1057 // Revision 1.11 1997/08/27 03:30:16 curt
1058 // Changed naming scheme of basic shared structures.
1060 // Revision 1.10 1997/08/25 20:27:22 curt
1061 // Merged in initial HUD and Joystick code.
1063 // Revision 1.9 1997/08/22 21:34:39 curt
1064 // Doing a bit of reorganizing and house cleaning.
1066 // Revision 1.8 1997/08/19 23:55:03 curt
1067 // Worked on better simulating real lighting.
1069 // Revision 1.7 1997/08/16 12:22:38 curt
1070 // Working on improving the lighting/shading.
1072 // Revision 1.6 1997/08/13 20:24:56 curt
1073 // Changes due to changing sunpos interface.
1075 // Revision 1.5 1997/08/06 21:08:32 curt
1076 // Sun position now really* works (I think) ... I still have sun time warping
1077 // code in place, probably should remove it soon.
1079 // Revision 1.4 1997/08/06 15:41:26 curt
1080 // Working on correct sun position.
1082 // Revision 1.3 1997/08/06 00:24:22 curt
1083 // Working on correct real time sun lighting.
1085 // Revision 1.2 1997/08/04 20:25:15 curt
1086 // Organizational tweaking.
1088 // Revision 1.1 1997/08/02 18:45:00 curt
1089 // Renamed GLmain.c GLUTmain.c
1091 // Revision 1.43 1997/08/02 16:23:47 curt
1094 // Revision 1.42 1997/08/01 19:43:33 curt
1095 // Making progress with coordinate system overhaul.
1097 // Revision 1.41 1997/07/31 22:52:37 curt
1098 // Working on redoing internal coordinate systems & scenery transformations.
1100 // Revision 1.40 1997/07/30 16:12:42 curt
1101 // Moved fg_random routines from Util/ to Math/
1103 // Revision 1.39 1997/07/21 14:45:01 curt
1106 // Revision 1.38 1997/07/19 23:04:47 curt
1107 // Added an initial weather section.
1109 // Revision 1.37 1997/07/19 22:34:02 curt
1110 // Moved PI definitions to ../constants.h
1111 // Moved random() stuff to ../Utils/ and renamed fg_random()
1113 // Revision 1.36 1997/07/18 23:41:25 curt
1114 // Tweaks for building with Cygnus Win32 compiler.
1116 // Revision 1.35 1997/07/18 14:28:34 curt
1117 // Hacked in some support for wind/turbulence.
1119 // Revision 1.34 1997/07/16 20:04:48 curt
1120 // Minor tweaks to aid Win32 port.
1122 // Revision 1.33 1997/07/12 03:50:20 curt
1123 // Added an #include <Windows32/Base.h> to help compiling for Win32
1125 // Revision 1.32 1997/07/11 03:23:18 curt
1126 // Solved some scenery display/orientation problems. Still have a positioning
1127 // (or transformation?) problem.
1129 // Revision 1.31 1997/07/11 01:29:58 curt
1130 // More tweaking of terrian floor.
1132 // Revision 1.30 1997/07/10 04:26:37 curt
1133 // We now can interpolated ground elevation for any position in the grid. We
1134 // can use this to enforce a "hard" ground. We still need to enforce some
1135 // bounds checking so that we don't try to lookup data points outside the
1138 // Revision 1.29 1997/07/09 21:31:12 curt
1139 // Working on making the ground "hard."
1141 // Revision 1.28 1997/07/08 18:20:12 curt
1142 // Working on establishing a hard ground.
1144 // Revision 1.27 1997/07/07 20:59:49 curt
1145 // Working on scenery transformations to enable us to fly fluidly over the
1146 // poles with no discontinuity/distortion in scenery.
1148 // Revision 1.26 1997/07/05 20:43:34 curt
1149 // renamed mat3 directory to Math so we could add other math related routines.
1151 // Revision 1.25 1997/06/29 21:19:17 curt
1152 // Working on scenery management system.
1154 // Revision 1.24 1997/06/26 22:14:53 curt
1155 // Beginning work on a scenery management system.
1157 // Revision 1.23 1997/06/26 19:08:33 curt
1158 // Restructuring make, adding automatic "make dep" support.
1160 // Revision 1.22 1997/06/25 15:39:47 curt
1161 // Minor changes to compile with rsxnt/win32.
1163 // Revision 1.21 1997/06/22 21:44:41 curt
1164 // Working on intergrating the VRML (subset) parser.
1166 // Revision 1.20 1997/06/21 17:12:53 curt
1167 // Capitalized subdirectory names.
1169 // Revision 1.19 1997/06/18 04:10:31 curt
1170 // A couple more runway tweaks ...
1172 // Revision 1.18 1997/06/18 02:21:24 curt
1173 // Hacked in a runway
1175 // Revision 1.17 1997/06/17 16:51:58 curt
1176 // Timer interval stuff now uses gettimeofday() instead of ftime()
1178 // Revision 1.16 1997/06/17 04:19:16 curt
1179 // More timer related tweaks with respect to view direction changes.
1181 // Revision 1.15 1997/06/17 03:41:10 curt
1182 // Nonsignal based interval timing is now working.
1183 // This would be a good time to look at cleaning up the code structure a bit.
1185 // Revision 1.14 1997/06/16 19:32:51 curt
1186 // Starting to add general timer support.
1188 // Revision 1.13 1997/06/02 03:40:06 curt
1189 // A tiny bit more view tweaking.
1191 // Revision 1.12 1997/06/02 03:01:38 curt
1192 // Working on views (side, front, back, transitions, etc.)
1194 // Revision 1.11 1997/05/31 19:16:25 curt
1195 // Elevator trim added.
1197 // Revision 1.10 1997/05/31 04:13:52 curt
1198 // WE CAN NOW FLY!!!
1200 // Continuing work on the LaRCsim flight model integration.
1201 // Added some MSFS-like keyboard input handling.
1203 // Revision 1.9 1997/05/30 19:27:01 curt
1204 // The LaRCsim flight model is starting to look like it is working.
1206 // Revision 1.8 1997/05/30 03:54:10 curt
1207 // Made a bit more progress towards integrating the LaRCsim flight model.
1209 // Revision 1.7 1997/05/29 22:39:49 curt
1210 // Working on incorporating the LaRCsim flight model.
1212 // Revision 1.6 1997/05/29 12:31:39 curt
1213 // Minor tweaks, moving towards general flight model integration.
1215 // Revision 1.5 1997/05/29 02:33:23 curt
1216 // Updated to reflect changing interfaces in other "modules."
1218 // Revision 1.4 1997/05/27 17:44:31 curt
1219 // Renamed & rearranged variables and routines. Added some initial simple
1220 // timer/alarm routines so the flight model can be updated on a regular
1223 // Revision 1.3 1997/05/23 15:40:25 curt
1224 // Added GNU copyright headers.
1227 // Revision 1.2 1997/05/23 00:35:12 curt
1228 // Trying to get fog to work ...
1230 // Revision 1.1 1997/05/21 15:57:51 curt
1231 // Renamed due to added GLUT support.
1233 // Revision 1.3 1997/05/19 18:22:42 curt
1234 // Parameter tweaking ... starting to stub in fog support.
1236 // Revision 1.2 1997/05/17 00:17:34 curt
1237 // Trying to stub in support for standard OpenGL.
1239 // Revision 1.1 1997/05/16 16:05:52 curt
1240 // Initial revision.