Cockpit/hud.cxx

   1 /**************************************************************************
   2  * hud.cxx -- hud defines and prototypes
   3  *
   4  * Written by Michele America, started September 1997.
   5  *
   6  * Copyright (C) 1997  Michele F. America  - micheleamerica@geocities.com
   7  *
   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.
  12  *
  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.
  17  *
  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.
  21  *
  22  * $Id$
  23  * (Log is kept at end of this file)
  24  **************************************************************************/
  25
  26
  27 #ifdef HAVE_CONFIG_H
  28 #  include <config.h>
  29 #endif
  30
  31 #ifdef HAVE_WINDOWS_H
  32 #  include <windows.h>
  33 #endif
  34
  35 #include <GL/glut.h>
  36 #include <stdlib.h>
  37 #include <string.h>
  38
  39 #ifdef HAVE_VALUES_H
  40 #  include <values.h>  // for MAXINT
  41 #endif
  42
  43 #include <Aircraft/aircraft.h>
  44 #include <Debug/fg_debug.h>
  45 #include <Include/fg_constants.h>
  46 #include <Main/options.hxx>
  47 #include <Math/fg_random.h>
  48 #include <Math/mat3.h>
  49 #include <Math/polar3d.hxx>
  50 #include <Scenery/scenery.hxx>
  51 #include <Time/fg_timer.hxx>
  52 #include <Weather/weather.h>
  53
  54 #include "hud.hxx"
  55
  56 #ifdef __sun__
  57 extern "C" {
  58   extern void *memmove(void *, const void *, size_t);
  59 }
  60 #endif
  61
  62
  63 // The following routines obtain information concerntin the aircraft's
  64 // current state and return it to calling instrument display routines.
  65 // They should eventually be member functions of the aircraft.
  66 //
  67
  68 deque< instr_item * > HUD_deque;
  69
  70 class locRECT {
  71   public:
  72     RECT rect;
  73
  74     locRECT( UINT left, UINT top, UINT right, UINT bottom);
  75     RECT get_rect(void) { return rect;}
  76 };
  77
  78 locRECT :: locRECT( UINT left, UINT top, UINT right, UINT bottom)
  79 {
  80   rect.left   =  left;
  81   rect.top    =  top;
  82   rect.right  =  right;
  83   rect.bottom =  bottom;
  84
  85 }
  86 // #define DEBUG
  87
  88 void drawOneLine( UINT x1, UINT y1, UINT x2, UINT y2)
  89 {
  90   glBegin(GL_LINES);
  91   glVertex2f(x1, y1);
  92   glVertex2f(x2, y2);
  93   glEnd();
  94 }
  95
  96 void drawOneLine( RECT &rect)
  97 {
  98   glBegin(GL_LINES);
  99   glVertex2f(rect.left, rect.top);
 100   glVertex2f(rect.right, rect.bottom);
 101   glEnd();
 102 }
 103
 104 //
 105 // The following code deals with painting the "instrument" on the display
 106 //
 107    /* textString - Bitmap font string */
 108
 109 void textString( int x, int y, char *msg, void *font ){
 110         glRasterPos2f(x, y);
 111         while (*msg) {
 112                 glutBitmapCharacter(font, *msg);
 113                 msg++;
 114     }
 115 }
 116
 117 /* strokeString - Stroke font string */
 118
 119 void strokeString(int x, int y, char *msg, void *font, float theta)
 120 {
 121 int xx;
 122 int yy;
 123
 124         glPushMatrix();
 125   glRotatef(theta * RAD_TO_DEG, 0.0, 0.0, 1.0);
 126   xx = x * cos(theta) + y * sin( theta );
 127   yy = y * cos(theta) - x * sin( theta );
 128         glTranslatef( xx, yy, 0);
 129         glScalef(.1, .1, 0.0);
 130         while (*msg) {
 131                 glutStrokeCharacter(font, *msg);
 132                 msg++;
 133         }
 134         glPopMatrix();
 135 }
 136
 137 //========================= End of Class Implementations===================
 138 // fgHUDInit
 139 //
 140 // Constructs a HUD object and then adds in instruments. At the present
 141 // the instruments are hard coded into the routine. Ultimately these need
 142 // to be defined by the aircraft's instrumentation records so that the
 143 // display for a Piper Cub doesn't show the speed range of a North American
 144 // mustange and the engine readouts of a B36!
 145 //
 146
 147 #define INSTRDEFS 21
 148
 149 int fgHUDInit( fgAIRCRAFT * /* current_aircraft */ )
 150 {
 151   instr_item *HIptr;
 152   int index;
 153
 154   fgPrintf( FG_COCKPIT, FG_INFO, "Initializing current aircraft HUD\n" );
 155
 156   HUD_deque.erase( HUD_deque.begin(), HUD_deque.end());  // empty the HUD deque
 157
 158 //  hud->code = 1;
 159 //  hud->status = 0;
 160
 161   // For now lets just hardcode the hud here.
 162   // In the future, hud information has to come from the same place
 163   // aircraft information came from.
 164
 165 //  fgHUDSetTimeMode( hud, NIGHT );
 166 //  fgHUDSetBrightness( hud, BRT_LIGHT );
 167
 168   index = 0;
 169
 170   do {
 171     switch ( index ) {
 172       case 0:     // TBI
 173         HIptr = (instr_item *) new fgTBI_instr( 270, 100, 60, 10 );
 174         break;
 175
 176       case 1:     // Artificial Horizon
 177         HIptr = (instr_item *) new HudLadder( 240, 195, 120, 180 );
 178         break;
 179
 180       case 2:    // KIAS
 181         HIptr = (instr_item *) new hud_card( 130,
 182                                              170,
 183                                               28,
 184                                              200,
 185                                              get_speed,
 186                                              HUDS_LEFT | HUDS_VERT,
 187                                              200.0, 0.0,
 188                                              1.0,
 189                                              10,  5,
 190                                              0,
 191                                              0,
 192                                              50.0,
 193                                              true);
 194
 195         break;
 196
 197       case 3:    // Angle of Attack
 198         HIptr = (instr_item *) new hud_card( 420,
 199                                              195,
 200                                               25,
 201                                              150,
 202                                              get_aoa,
 203                                              HUDS_LEFT | HUDS_VERT,
 204                                              50, -40,
 205                                              1.0,
 206                                              2,    1,
 207                                              0,
 208                                              1,
 209                                              5.0,
 210                                              true);
 211         break;
 212
 213       case 4:    // GYRO COMPASS
 214         HIptr = (instr_item *) new hud_card( 200,
 215                                              375,
 216                                              200,
 217                                               28,
 218                                              get_heading,
 219                                              HUDS_TOP,
 220                                              360, 0,
 221                                                1.0,
 222                                                5,   1,
 223                                              360,
 224                                                0,
 225                                               25,
 226                                              true);
 227         break;
 228
 229       case 5:    // AMSL
 230         HIptr = (instr_item *) new hud_card( 460,
 231                                              170,
 232                                               35,
 233                                              200,
 234                                              get_altitude,
 235                                              HUDS_RIGHT | HUDS_VERT,
 236                                              15000, 0,
 237                                              1.0,
 238                                              100,  25,
 239                                              0,
 240                                              0,
 241                                              250,
 242                                              true);
 243         break;
 244
 245       case 6:
 246         HIptr = (instr_item *) new  guage_instr( 250,            // x
 247                                                  350,            // y
 248                                                  100,            // width
 249                                                   20,            // height
 250                                                  get_aileronval, // data source
 251                                                  HUDS_BOTTOM | HUDS_NOTEXT,
 252                                                  100.0,
 253                                                  +1.0,
 254                                                  -1.0);
 255         break;
 256
 257       case 7:
 258         HIptr = (instr_item *) new  guage_instr( 170,             // x
 259                                                  225,             // y
 260                                                   20,             // width
 261                                                  100,             // height
 262                                                  get_elevatorval, // data source
 263                                                  HUDS_RIGHT | HUDS_VERT | HUDS_NOTEXT,
 264                                                 -100.0,           // Scale data
 265                                                   +1.0,           // Data Range
 266                                                   -1.0);
 267         break;
 268
 269       case 8:
 270         HIptr = (instr_item *) new  guage_instr( 250,             // x
 271                                                  200,             // y
 272                                                  100,             // width
 273                                                   20,             // height
 274                                                  get_rudderval,   // data source
 275                                                  HUDS_TOP | HUDS_NOTEXT,
 276                                                  100.0,
 277                                                  +1.0,
 278                                                  -1.0);
 279         break;
 280
 281       case 9:
 282         HIptr = (instr_item *) new  guage_instr( 100,             // x
 283                                                  190,
 284                                                   20,
 285                                                  160,             // height
 286                                                  get_throttleval, // data source
 287                                                  HUDS_VERT | HUDS_RIGHT | HUDS_NOTEXT,
 288                                                  100.0,
 289                                                    1.0,
 290                                                    0.0);
 291         break;
 292
 293       case 10:    // Digital KIAS
 294         HIptr = (instr_item *) new instr_label ( 110,
 295                                                  150,
 296                                                   40,
 297                                                   30,
 298                                                  get_speed,
 299                                                  "%5.0f",
 300                                                  NULL,
 301                                                  " Kts",
 302                                                  1.0,
 303                                                  HUDS_TOP,
 304                                                  RIGHT_JUST,
 305                                                  SMALL,
 306                                                  0,
 307                                                  TRUE );
 308         break;
 309
 310       case 11:    // Digital Altimeter
 311         HIptr = (instr_item *) new instr_label ( 110,
 312                                                  135,
 313                                                   40,
 314                                                   10,
 315                                                  get_altitude,
 316                                                  "MSL  %5.0f",
 317                                                  NULL,
 318                                                  " m",
 319                                                  1.0,
 320                                                  HUDS_TOP,
 321                                                  LEFT_JUST,
 322                                                  SMALL,
 323                                                  0,
 324                                                  TRUE );
 325         break;
 326
 327       case 12:    // Roll indication diagnostic
 328         HIptr = (instr_item *) new instr_label ( 110,
 329                                                  120,
 330                                                   40,
 331                                                   10,
 332                                                  get_roll,
 333                                                  "%5.2f",
 334                                                  " Roll",
 335                                                  " Deg",
 336                                                  1.0,
 337                                                  HUDS_TOP,
 338                                                  RIGHT_JUST,
 339                                                  SMALL,
 340                                                  0,
 341                                                  TRUE );
 342         break;
 343
 344       case 13:    // Angle of attack diagnostic
 345         HIptr = (instr_item *) new instr_label ( 440,
 346                                                  150,
 347                                                   60,
 348                                                   10,
 349                                                  get_aoa,
 350                                                  "      %5.2f",
 351                                                  "AOA",
 352                                                  " Deg",
 353                                                  1.0,
 354                                                  HUDS_TOP,
 355                                                  RIGHT_JUST,
 356                                                  SMALL,
 357                                                  0,
 358                                                  TRUE );
 359         break;
 360
 361       case 14:
 362         HIptr = (instr_item *) new instr_label ( 440,
 363                                                  135,
 364                                                   60,
 365                                                   10,
 366                                                  get_heading,
 367                                                  " %5.1f",
 368                                                  "Heading ",
 369                                                  " Deg",
 370                                                  1.0,
 371                                                  HUDS_TOP,
 372                                                  RIGHT_JUST,
 373                                                  SMALL,
 374                                                  0,
 375                                                  TRUE );
 376         break;
 377
 378       case 15:
 379         HIptr = (instr_item *) new instr_label ( 440,
 380                                                  120,
 381                                                   60,
 382                                                   10,
 383                                                  get_sideslip,
 384                                                  "%5.2f",
 385                                                  "Sideslip ",
 386                                                  NULL,
 387                                                  1.0,
 388                                                  HUDS_TOP,
 389                                                  RIGHT_JUST,
 390                                                  SMALL,
 391                                                  0,
 392                                                  TRUE );
 393         break;
 394
 395       case 16:
 396         HIptr = (instr_item *) new instr_label( 440,
 397                                                 100,
 398                                                  60,
 399                                                  10,
 400                                                 get_throttleval,
 401                                                 "%5.2f",
 402                                                 "Throttle ",
 403                                                 NULL,
 404                                                  1.0,
 405                                                 HUDS_TOP,
 406                                                 RIGHT_JUST,
 407                                                 SMALL,
 408                                                 0,
 409                                                 TRUE );
 410         break;
 411
 412       case 17:
 413         HIptr = (instr_item *) new instr_label( 440,
 414                                                  85,
 415                                                  60,
 416                                                  10,
 417                                                 get_elevatorval,
 418                                                 "%5.2f",
 419                                                 "Elevator ",
 420                                                 NULL,
 421                                                  1.0,
 422                                                 HUDS_TOP,
 423                                                 RIGHT_JUST,
 424                                                 SMALL,
 425                                                 0,
 426                                                 TRUE );
 427         break;
 428
 429       case 18:
 430         HIptr = (instr_item *) new instr_label( 440,
 431                                                  60,
 432                                                  60,
 433                                                  10,
 434                                                 get_aileronval,
 435                                                 "%5.2f",
 436                                                 "Aileron  ",
 437                                                 NULL,
 438                                                  1.0,
 439                                                 HUDS_TOP,
 440                                                 RIGHT_JUST,
 441                                                 SMALL,
 442                                                 0,
 443                                                 TRUE );
 444         break;
 445
 446
 447       case 19:
 448         HIptr = (instr_item *) new instr_label( 10,
 449                                                 10,
 450                                                 60,
 451                                                 10,
 452                                                  get_frame_rate,
 453                                                 "%.1f",
 454                                                 "Frame rate = ",
 455                                                 NULL,
 456                                                  1.0,
 457                                                 HUDS_TOP,
 458                                                 RIGHT_JUST,
 459                                                 SMALL,
 460                                                 0,
 461                                                 TRUE );
 462         break;
 463
 464       case 20:
 465         HIptr = (instr_item *) new instr_label( 10,
 466                                                 25,
 467                                                 90,
 468                                                 10,
 469                                                  get_vfc_ratio,
 470                                                 "%.2f",
 471                                                 "VFC Ratio = ",
 472                                                 NULL,
 473                                                  1.0,
 474                                                 HUDS_TOP,
 475                                                 RIGHT_JUST,
 476                                                 SMALL,
 477                                                 0,
 478                                                 TRUE );
 479         break;
 480
 481       case 21:
 482         HIptr = (instr_item *) new instr_label( 10,
 483                                                 40,
 484                                                 90,
 485                                                 10,
 486                                                 get_fov,
 487                                                 "%.1f",
 488                                                 "FOV = ",
 489                                                 NULL,
 490                                                  1.0,
 491                                                 HUDS_TOP,
 492                                                 RIGHT_JUST,
 493                                                 SMALL,
 494                                                 0,
 495                                                 TRUE );
 496         break;
 497
 498       default:
 499         HIptr = 0;;
 500       }
 501     if( HIptr ) {                   // Anything to install?
 502       HUD_deque.insert( HUD_deque.begin(), HIptr);
 503       }
 504     index++;
 505     }
 506   while( HIptr );
 507
 508   return 0;  // For now. Later we may use this for an error code.
 509 }
 510
 511 int global_day_night_switch = DAY;
 512
 513 void HUD_brightkey( bool incr_bright )
 514 {
 515 instr_item *pHUDInstr = HUD_deque[0];
 516 int brightness        = pHUDInstr->get_brightness();
 517
 518   if( current_options.get_hud_status() ) {
 519     if( incr_bright ) {
 520       switch (brightness) {
 521         case BRT_LIGHT:
 522               current_options.set_hud_status(0);
 523           break;
 524
 525         case BRT_MEDIUM:
 526           brightness = BRT_LIGHT;
 527           break;
 528
 529         case BRT_DARK:
 530           brightness = BRT_MEDIUM;
 531           break;
 532
 533         case BRT_BLACK:
 534           brightness = BRT_DARK;
 535           break;
 536
 537         default:
 538           brightness = BRT_BLACK;
 539         }
 540       }
 541     else {
 542       switch (brightness) {
 543         case BRT_LIGHT:
 544           brightness = BRT_MEDIUM;
 545           break;
 546
 547         case BRT_MEDIUM:
 548           brightness = BRT_DARK;
 549           break;
 550
 551         case BRT_DARK:
 552           brightness = BRT_BLACK;
 553           break;
 554
 555         case BRT_BLACK:
 556         default:
 557               current_options.set_hud_status(0);
 558         }
 559       }
 560     }
 561   else {
 562     current_options.set_hud_status(1);
 563     if( incr_bright ) {
 564       if( DAY == global_day_night_switch ) {
 565         brightness = BRT_BLACK;
 566         }
 567       else {
 568         brightness = BRT_DARK;
 569         global_day_night_switch = DAY;
 570         }
 571       }
 572     else {
 573       if( NIGHT == global_day_night_switch ) {
 574         brightness = BRT_DARK;
 575         }
 576       else {
 577         brightness = BRT_MEDIUM;
 578         global_day_night_switch = NIGHT;
 579         }
 580       }
 581     }
 582   pHUDInstr->SetBrightness( brightness );
 583 }
 584
 585 // fgUpdateHUD
 586 //
 587 // Performs a once around the list of calls to instruments installed in
 588 // the HUD object with requests for redraw. Kinda. It will when this is
 589 // all C++.
 590 //
 591 void fgUpdateHUD( void ) {
 592   int i;
 593   int brightness;
 594 //  int day_night_sw = current_aircraft.controls->day_night_switch;
 595   int day_night_sw = global_day_night_switch;
 596   int hud_displays = HUD_deque.size();
 597   instr_item *pHUDInstr;
 598
 599   if( !hud_displays ) {  // Trust everyone, but ALWAYS cut the cards!
 600     return;
 601     }
 602
 603   pHUDInstr = HUD_deque[0];
 604   brightness = pHUDInstr->get_brightness();
 605 //  brightness = HUD_deque.at(0)->get_brightness();
 606
 607   glMatrixMode(GL_PROJECTION);
 608   glPushMatrix();
 609
 610   glLoadIdentity();
 611   gluOrtho2D(0, 640, 0, 480);
 612   glMatrixMode(GL_MODELVIEW);
 613   glPushMatrix();
 614   glLoadIdentity();
 615
 616   glColor3f(1.0, 1.0, 1.0);
 617   glIndexi(7);
 618
 619   glDisable(GL_DEPTH_TEST);
 620   glDisable(GL_LIGHTING);
 621
 622   glLineWidth(1);
 623
 624   for( i = hud_displays; i; --i) { // Draw everything
 625 //    if( HUD_deque.at(i)->enabled()) {
 626     pHUDInstr = HUD_deque[i - 1];
 627     if( pHUDInstr->enabled()) {
 628                                    // We should to respond to a dial instead
 629                                    // or as well to the of time of day. Of
 630                                    // course, we have no dial!
 631       if( day_night_sw == DAY) {
 632         switch (brightness) {
 633           case BRT_LIGHT:
 634             glColor3f (0.1, 0.9, 0.1);
 635             break;
 636
 637           case BRT_MEDIUM:
 638             glColor3f (0.1, 0.7, 0.0);
 639             break;
 640
 641           case BRT_DARK:
 642             glColor3f (0.0, 0.5, 0.0);
 643             break;
 644
 645           case BRT_BLACK:
 646             glColor3f( 0.0, 0.0, 0.0);
 647             break;
 648
 649           default:;
 650             }
 651           }
 652         else {
 653           if( day_night_sw == NIGHT) {
 654             switch (brightness) {
 655               case BRT_LIGHT:
 656                 glColor3f (0.9, 0.1, 0.1);
 657                 break;
 658
 659               case BRT_MEDIUM:
 660                 glColor3f (0.7, 0.0, 0.1);
 661                 break;
 662
 663               case BRT_DARK:
 664               default:
 665                 glColor3f (0.5, 0.0, 0.0);
 666               }
 667             }
 668           else {     // Just in case default
 669             glColor3f (0.1, 0.9, 0.1);
 670             }
 671           }
 672     //  fgPrintf( FG_COCKPIT, FG_DEBUG, "HUD Code %d  Status %d\n",
 673     //            hud->code, hud->status );
 674       pHUDInstr->draw();
 675 //      HUD_deque.at(i)->draw(); // Responsible for broken or fixed variants.
 676                               // No broken displays honored just now.
 677       }
 678     }
 679
 680   glEnable(GL_DEPTH_TEST);
 681   glEnable(GL_LIGHTING);
 682   glMatrixMode(GL_PROJECTION);
 683   glPopMatrix();
 684   glMatrixMode(GL_MODELVIEW);
 685   glPopMatrix();
 686 }
 687
 688 /* $Log$
 689 /* Revision 1.16  1998/07/13 21:00:47  curt
 690 /* Integrated Charlies latest HUD updates.
 691 /* Wrote access functions for current fgOPTIONS.
 692 /*
 693  * Revision 1.15  1998/07/08 14:41:08  curt
 694  * Renamed polar3d.h to polar3d.hxx
 695  *
 696  * Revision 1.14  1998/07/06 21:31:20  curt
 697  * Removed an extraneous ^M.
 698  *
 699  * Revision 1.13  1998/07/03 13:16:28  curt
 700  * Added Charlie Hotchkiss's HUD updates and improvementes.
 701  *
 702  * Revision 1.11  1998/06/05 18:17:10  curt
 703  * Added the declaration of memmove needed by the stl which apparently
 704  * solaris only defines for cc compilations and not for c++ (__STDC__)
 705  *
 706  * Revision 1.10  1998/05/17 16:58:12  curt
 707  * Added a View Frustum Culling ratio display to the hud.
 708  *
 709  * Revision 1.9  1998/05/16 13:04:14  curt
 710  * New updates from Charlie Hotchkiss.
 711  *
 712  * Revision 1.8  1998/05/13 18:27:54  curt
 713  * Added an fov to hud display.
 714  *
 715  * Revision 1.7  1998/05/11 18:13:11  curt
 716  * Complete C++ rewrite of all cockpit code by Charlie Hotchkiss.
 717  *
 718  * Revision 1.22  1998/04/18 04:14:02  curt
 719  * Moved fg_debug.c to it's own library.
 720  *
 721  * Revision 1.21  1998/04/03 21:55:28  curt
 722  * Converting to Gnu autoconf system.
 723  * Tweaks to hud.c
 724  *
 725  * Revision 1.20  1998/03/09 22:48:40  curt
 726  * Minor "formatting" tweaks.
 727  *
 728  * Revision 1.19  1998/02/23 20:18:28  curt
 729  * Incorporated Michele America's hud changes.
 730  *
 731  * Revision 1.18  1998/02/21 14:53:10  curt
 732  * Added Charlie's HUD changes.
 733  *
 734  * Revision 1.17  1998/02/20 00:16:21  curt
 735  * Thursday's tweaks.
 736  *
 737  * Revision 1.16  1998/02/19 13:05:49  curt
 738  * Incorporated some HUD tweaks from Michelle America.
 739  * Tweaked the sky's sunset/rise colors.
 740  * Other misc. tweaks.
 741  *
 742  * Revision 1.15  1998/02/16 13:38:39  curt
 743  * Integrated changes from Charlie Hotchkiss.
 744  *
 745  * Revision 1.14  1998/02/12 21:59:41  curt
 746  * Incorporated code changes contributed by Charlie Hotchkiss
 747  * <chotchkiss@namg.us.anritsu.com>
 748  *
 749  * Revision 1.12  1998/02/09 15:07:48  curt
 750  * Minor tweaks.
 751  *
 752  * Revision 1.11  1998/02/07 15:29:34  curt
 753  * Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
 754  * <chotchkiss@namg.us.anritsu.com>
 755  *
 756  * Revision 1.10  1998/02/03 23:20:14  curt
 757  * Lots of little tweaks to fix various consistency problems discovered by
 758  * Solaris' CC.  Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
 759  * passed arguments along to the real printf().  Also incorporated HUD changes
 760  * by Michele America.
 761  *
 762  * Revision 1.9  1998/01/31 00:43:04  curt
 763  * Added MetroWorks patches from Carmen Volpe.
 764  *
 765  * Revision 1.8  1998/01/27 00:47:51  curt
 766  * Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
 767  * system and commandline/config file processing code.
 768  *
 769  * Revision 1.7  1998/01/19 18:40:20  curt
 770  * Tons of little changes to clean up the code and to remove fatal errors
 771  * when building with the c++ compiler.
 772  *
 773  * Revision 1.6  1997/12/15 23:54:34  curt
 774  * Add xgl wrappers for debugging.
 775  * Generate terrain normals on the fly.
 776  *
 777  * Revision 1.5  1997/12/10 22:37:39  curt
 778  * Prepended "fg" on the name of all global structures that didn't have it yet.
 779  * i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
 780  *
 781  * Revision 1.4  1997/09/23 00:29:32  curt
 782  * Tweaks to get things to compile with gcc-win32.
 783  *
 784  * Revision 1.3  1997/09/05 14:17:26  curt
 785  * More tweaking with stars.
 786  *
 787  * Revision 1.2  1997/09/04 02:17:30  curt
 788  * Shufflin' stuff.
 789  *
 790  * Revision 1.1  1997/08/29 18:03:22  curt
 791  * Initial revision.
 792  *
 793  */