src/Main/main.cxx

   1 // main.cxx -- top level sim routines
   2 //
   3 // Written by Curtis Olson, started May 1997.
   4 //
   5 // Copyright (C) 1997 - 2002  Curtis L. Olson  - curt@flightgear.org
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 //
  21 // $Id$
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include <config.h>
  26 #endif
  27
  28 #if defined(__linux__) && defined(__i386__)
  29 #  include <fpu_control.h>
  30 #  include <signal.h>
  31 #endif
  32
  33 #include <simgear/compiler.h>
  34
  35 #include STL_IOSTREAM
  36 #ifndef SG_HAVE_NATIVE_SGI_COMPILERS
  37 SG_USING_STD(cerr);
  38 SG_USING_STD(endl);
  39 #endif
  40
  41 #include <simgear/misc/exception.hxx>
  42 #include <simgear/ephemeris/ephemeris.hxx>
  43 #include <simgear/route/route.hxx>
  44
  45 #ifdef SG_MATH_EXCEPTION_CLASH
  46 #  include <math.h>
  47 #endif
  48
  49 #ifdef HAVE_WINDOWS_H
  50 #  include <windows.h>
  51 #  include <float.h>
  52 #endif
  53
  54 #include <GL/glut.h>
  55 #include <GL/gl.h>
  56
  57 #include <stdio.h>
  58 #include <string.h>             // for strcmp()
  59 #include <string>
  60
  61 #ifdef HAVE_STDLIB_H
  62 #   include <stdlib.h>
  63 #endif
  64
  65 #ifdef HAVE_SYS_STAT_H
  66 #  include <sys/stat.h>         // for stat()
  67 #endif
  68
  69 #ifdef HAVE_UNISTD_H
  70 #  include <unistd.h>           // for stat()
  71 #endif
  72
  73 #include <plib/netChat.h>
  74 #include <plib/pu.h>
  75 #include <plib/sg.h>
  76 #include <plib/ssg.h>
  77
  78 #include <simgear/constants.h>  // for VERSION
  79 #include <simgear/debug/logstream.hxx>
  80 #include <simgear/math/polar3d.hxx>
  81 #include <simgear/math/sg_random.h>
  82 #include <simgear/misc/sg_path.hxx>
  83 #include <simgear/sky/sky.hxx>
  84 #include <simgear/timing/sg_time.hxx>
  85
  86 #include <Include/general.hxx>
  87
  88 #include <Aircraft/aircraft.hxx>
  89
  90 #include <ATC/ATCmgr.hxx>
  91 #include <ATC/ATCdisplay.hxx>
  92 //#include <ATC/AIMgr.hxx>
  93
  94
  95 #include <Autopilot/newauto.hxx>
  96
  97 #include <Cockpit/cockpit.hxx>
  98 #include <Cockpit/radiostack.hxx>
  99 #include <Cockpit/steam.hxx>
 100
 101 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 102 #include <GUI/gui.h>
 103 #include <Model/acmodel.hxx>
 104 #include <Model/loader.hxx>
 105 #include <Model/model.hxx>
 106 #include <Model/modelmgr.hxx>
 107 #include <Main/location.hxx>
 108 #ifdef FG_NETWORK_OLK
 109 #include <NetworkOLK/network.h>
 110 #endif
 111 #include <Objects/matlib.hxx>
 112 #include <Scenery/scenery.hxx>
 113 #include <Scenery/tilemgr.hxx>
 114 #ifdef ENABLE_AUDIO_SUPPORT
 115 #  include <Sound/soundmgr.hxx>
 116 #  include <Sound/fg_fx.hxx>
 117 #  include <Sound/morse.hxx>
 118 #endif
 119 #include <Time/FGEventMgr.hxx>
 120 #include <Time/fg_timer.hxx>
 121 #include <Time/light.hxx>
 122 #include <Time/sunpos.hxx>
 123 #include <Time/tmp.hxx>
 124
 125 #include <Input/input.hxx>
 126
 127 // ADA
 128 #include <simgear/misc/sgstream.hxx>
 129 #include <simgear/math/point3d.hxx>
 130 #include <FDM/flight.hxx>
 131 #include <FDM/ADA.hxx>
 132 #include <Scenery/tileentry.hxx>
 133
 134 #if !defined(sgi)
 135 // PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 136 // PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 137 #endif
 138 float default_attenuation[3] = {1.0, 0.0, 0.0};
 139 //Required for using GL_extensions
 140 void fgLoadDCS (void);
 141 void fgUpdateDCS (void);
 142 ssgSelector *ship_sel=NULL;
 143 // upto 32 instances of a same object can be loaded.
 144 ssgTransform *ship_pos[32];
 145 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 146 int objc=0;
 147 ssgSelector *lightpoints_brightness = new ssgSelector;
 148 ssgTransform *lightpoints_transform = new ssgTransform;
 149 FGTileEntry *dummy_tile;
 150 sgVec3 rway_ols;
 151 // ADA
 152 // Clip plane settings...
 153 float scene_nearplane = 0.5f;
 154 float scene_farplane = 120000.0f;
 155
 156 static double delta_time_sec = 0;
 157
 158
 159 #ifdef FG_WEATHERCM
 160 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 161 #else
 162 #  include <Environment/environment_mgr.hxx>
 163 #endif
 164
 165 #include "version.h"
 166
 167 #include "fg_init.hxx"
 168 #include "fg_io.hxx"
 169 #include "fg_props.hxx"
 170 #include "globals.hxx"
 171 #include "splash.hxx"
 172 #include "viewmgr.hxx"
 173 #include "options.hxx"
 174 #include "logger.hxx"
 175
 176 #ifdef macintosh
 177 #  include <console.h>          // -dw- for command line dialog
 178 #endif
 179
 180
 181 FGEventMgr global_events;
 182
 183 // This is a record containing a bit of global housekeeping information
 184 FGGeneral general;
 185
 186 // Specify our current idle function state.  This is used to run all
 187 // our initializations out of the glutIdleLoop() so that we can get a
 188 // splash screen up and running right away.
 189 static int idle_state = 0;
 190 static long global_multi_loop;
 191
 192 // forward declaration
 193 void fgReshape( int width, int height );
 194
 195 // fog constants.  I'm a little nervous about putting actual code out
 196 // here but it seems to work (?)
 197 static const double m_log01 = -log( 0.01 );
 198 static const double sqrt_m_log01 = sqrt( m_log01 );
 199 static GLfloat fog_exp_density;
 200 static GLfloat fog_exp2_density;
 201 static GLfloat fog_exp2_punch_through;
 202
 203 #ifdef FG_NETWORK_OLK
 204 ssgSelector *fgd_sel = NULL;
 205 ssgTransform *fgd_pos = NULL;
 206 #endif
 207
 208 // Sky structures
 209 SGSky *thesky;
 210
 211 // hack
 212 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 213 {
 214   {  1.0f,  0.0f,  0.0f,  0.0f },
 215   {  0.0f,  0.0f, -1.0f,  0.0f },
 216   {  0.0f,  1.0f,  0.0f,  0.0f },
 217   {  0.0f,  0.0f,  0.0f,  1.0f }
 218 };
 219
 220 // The following defines flightgear options. Because glutlib will also
 221 // want to parse its own options, those options must not be included here
 222 // or they will get parsed by the main program option parser. Hence case
 223 // is significant for any option added that might be in conflict with
 224 // glutlib's parser.
 225 //
 226 // glutlib parses for:
 227 //    -display
 228 //    -direct   (invalid in Win32)
 229 //    -geometry
 230 //    -gldebug
 231 //    -iconized
 232 //    -indirect (invalid in Win32)
 233 //    -synce
 234 //
 235 // Note that glutlib depends upon strings while this program's
 236 // option parser wants only initial characters followed by numbers
 237 // or pathnames.
 238 //
 239
 240
 241 ssgSimpleState *default_state;
 242 ssgSimpleState *hud_and_panel;
 243 ssgSimpleState *menus;
 244
 245 SGTimeStamp last_time_stamp;
 246 SGTimeStamp current_time_stamp;
 247
 248 void fgBuildRenderStates( void ) {
 249     default_state = new ssgSimpleState;
 250     default_state->ref();
 251     default_state->disable( GL_TEXTURE_2D );
 252     default_state->enable( GL_CULL_FACE );
 253     default_state->enable( GL_COLOR_MATERIAL );
 254     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 255     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 256     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 257     default_state->disable( GL_BLEND );
 258     default_state->disable( GL_ALPHA_TEST );
 259     default_state->disable( GL_LIGHTING );
 260
 261     hud_and_panel = new ssgSimpleState;
 262     hud_and_panel->ref();
 263     hud_and_panel->disable( GL_CULL_FACE );
 264     hud_and_panel->disable( GL_TEXTURE_2D );
 265     hud_and_panel->disable( GL_LIGHTING );
 266     hud_and_panel->enable( GL_BLEND );
 267
 268     menus = new ssgSimpleState;
 269     menus->ref();
 270     menus->disable( GL_CULL_FACE );
 271     menus->disable( GL_TEXTURE_2D );
 272     menus->enable( GL_BLEND );
 273 }
 274
 275
 276 // fgInitVisuals() -- Initialize various GL/view parameters
 277 void fgInitVisuals( void ) {
 278     fgLIGHT *l;
 279
 280     l = &cur_light_params;
 281
 282 #ifndef GLUT_WRONG_VERSION
 283     // Go full screen if requested ...
 284     if ( fgGetBool("/sim/startup/fullscreen") ) {
 285         glutFullScreen();
 286     }
 287 #endif
 288
 289     // If enabled, normal vectors specified with glNormal are scaled
 290     // to unit length after transformation.  Enabling this has
 291     // performance implications.  See the docs for glNormal.
 292     // glEnable( GL_NORMALIZE );
 293
 294     glEnable( GL_LIGHTING );
 295     glEnable( GL_LIGHT0 );
 296     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 297
 298     sgVec3 sunpos;
 299     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 300     ssgGetLight( 0 ) -> setPosition( sunpos );
 301
 302     glFogi (GL_FOG_MODE, GL_EXP2);
 303     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 304          (!fgGetBool("/sim/rendering/shading"))) {
 305         // if fastest fog requested, or if flat shading force fastest
 306         glHint ( GL_FOG_HINT, GL_FASTEST );
 307     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 308         glHint ( GL_FOG_HINT, GL_NICEST );
 309     }
 310     if ( fgGetBool("/sim/rendering/wireframe") ) {
 311         // draw wire frame
 312         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 313     }
 314
 315     // This is the default anyways, but it can't hurt
 316     glFrontFace ( GL_CCW );
 317
 318     // Just testing ...
 319     // glEnable(GL_POINT_SMOOTH);
 320     // glEnable(GL_LINE_SMOOTH);
 321     // glEnable(GL_POLYGON_SMOOTH);
 322 }
 323
 324
 325 // For HiRes screen Dumps using Brian Pauls TR Library
 326 void trRenderFrame( void ) {
 327
 328     if ( fgPanelVisible() ) {
 329         GLfloat height = fgGetInt("/sim/startup/ysize");
 330         GLfloat view_h =
 331             (current_panel->getViewHeight() - current_panel->getYOffset())
 332             * (height / 768.0) + 1;
 333         glTranslatef( 0.0, view_h, 0.0 );
 334     }
 335
 336     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 337     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 338
 339     fgLIGHT *l = &cur_light_params;
 340
 341     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 342                  l->adj_fog_color[2], l->adj_fog_color[3]);
 343
 344     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 345
 346     // set the opengl state to known default values
 347     default_state->force();
 348
 349     glEnable( GL_FOG );
 350     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 351     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 352     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 353
 354     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 355     // we only update GL_AMBIENT for our lights we will never get
 356     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 357     // explicitely to black.
 358     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 359
 360     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 361
 362     // texture parameters
 363     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 364     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 365
 366     // we need a white diffuse light for the phase of the moon
 367     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 368     thesky->preDraw();
 369
 370     // draw the ssg scene
 371     // return to the desired diffuse color
 372     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 373     glEnable( GL_DEPTH_TEST );
 374     ssgSetNearFar( scene_nearplane, scene_farplane );
 375     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 376
 377     // draw the lights
 378     glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 379     ssgSetNearFar( scene_nearplane, scene_farplane );
 380     ssgCullAndDraw( globals->get_scenery()->get_lighting() );
 381
 382     if (fgGetBool("/environment/clouds/status"))
 383       thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 384
 385     globals->get_model_mgr()->draw();
 386     globals->get_aircraft_model()->draw();
 387
 388     // need to do this here as hud_and_panel state is static to
 389     // main.cxx  and HUD and Panel routines have to be called with
 390     // knowledge of the the TR struct < see gui.cxx::HighResDump()
 391     hud_and_panel->apply();
 392 }
 393
 394
 395 // Update all Visuals (redraws anything graphics related)
 396 void fgRenderFrame() {
 397
 398     // Process/manage pending events
 399     global_events.update( delta_time_sec );
 400
 401     static const SGPropertyNode *longitude
 402         = fgGetNode("/position/longitude-deg");
 403     static const SGPropertyNode *latitude
 404         = fgGetNode("/position/latitude-deg");
 405     static const SGPropertyNode *altitude
 406         = fgGetNode("/position/altitude-ft");
 407     static const SGPropertyNode *groundlevel_nearplane
 408         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 409
 410     // Update the default (kludged) properties.
 411     fgUpdateProps();
 412
 413     FGViewer *current__view = globals->get_current_view();
 414
 415     fgLIGHT *l = &cur_light_params;
 416     static double last_visibility = -9999;
 417
 418     // update fog params
 419     double actual_visibility       = thesky->get_visibility();
 420     if ( actual_visibility != last_visibility ) {
 421         last_visibility = actual_visibility;
 422
 423         fog_exp_density = m_log01 / actual_visibility;
 424         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 425         fog_exp2_punch_through = sqrt_m_log01 / ( actual_visibility * 2.5 );
 426     }
 427
 428     // double angle;
 429     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 430     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 431     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 432     // GLfloat mat_shininess[] = { 10.0 };
 433     GLbitfield clear_mask;
 434
 435     if ( idle_state != 1000 ) {
 436         // still initializing, draw the splash screen
 437         if ( fgGetBool("/sim/startup/splash-screen") ) {
 438             fgSplashUpdate(0.0);
 439         }
 440         // Keep resetting sim time while the sim is initializing
 441         globals->set_sim_time_sec( 0.0 );
 442     } else {
 443         // idle_state is now 1000 meaning we've finished all our
 444         // initializations and are running the main loop, so this will
 445         // now work without seg faulting the system.
 446
 447         // calculate our current position in cartesian space
 448         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 449
 450         // update view port
 451         fgReshape( fgGetInt("/sim/startup/xsize"),
 452                    fgGetInt("/sim/startup/ysize") );
 453
 454         // set the sun position (done later with ssg calls)
 455         // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 456
 457         clear_mask = GL_DEPTH_BUFFER_BIT;
 458         if ( fgGetBool("/sim/rendering/wireframe") ) {
 459             clear_mask |= GL_COLOR_BUFFER_BIT;
 460         }
 461
 462         if ( fgGetBool("/sim/rendering/skyblend") ) {
 463             if ( fgGetBool("/sim/rendering/textures") ) {
 464                 // glClearColor(black[0], black[1], black[2], black[3]);
 465                 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 466                              l->adj_fog_color[2], l->adj_fog_color[3]);
 467                 clear_mask |= GL_COLOR_BUFFER_BIT;
 468             }
 469         } else {
 470             glClearColor(l->sky_color[0], l->sky_color[1],
 471                          l->sky_color[2], l->sky_color[3]);
 472             clear_mask |= GL_COLOR_BUFFER_BIT;
 473         }
 474         glClear( clear_mask );
 475
 476         // Tell GL we are switching to model view parameters
 477
 478         // I really should create a derived ssg node or use a call
 479         // back or something so that I can draw the sky within the
 480         // ssgCullAndDraw() function, but for now I just mimic what
 481         // ssg does to set up the model view matrix
 482         glMatrixMode(GL_MODELVIEW);
 483         glLoadIdentity();
 484         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 485
 486         // set the opengl state to known default values
 487         default_state->force();
 488
 489         // update fog params if visibility has changed
 490         double visibility_meters = fgGetDouble("/environment/visibility-m");
 491         thesky->set_visibility(visibility_meters);
 492
 493         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 494                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 495                             / (double)fgGetInt("/sim/model-hz") );
 496
 497         // Set correct opengl fog density
 498         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 499
 500         // update the sky dome
 501         if ( fgGetBool("/sim/rendering/skyblend") ) {
 502             /* cout << "thesky->repaint() sky_color = "
 503                  << cur_light_params.sky_color[0] << " "
 504                  << cur_light_params.sky_color[1] << " "
 505                  << cur_light_params.sky_color[2] << " "
 506                  << cur_light_params.sky_color[3] << endl;
 507             cout << "    fog = "
 508                  << cur_light_params.fog_color[0] << " "
 509                  << cur_light_params.fog_color[1] << " "
 510                  << cur_light_params.fog_color[2] << " "
 511                  << cur_light_params.fog_color[3] << endl;
 512             cout << "    sun_angle = " << cur_light_params.sun_angle
 513                  << "    moon_angle = " << cur_light_params.moon_angle
 514                  << endl; */
 515             thesky->repaint( cur_light_params.sky_color,
 516                              cur_light_params.adj_fog_color,
 517                              cur_light_params.sun_angle,
 518                              cur_light_params.moon_angle,
 519                              globals->get_ephem()->getNumPlanets(),
 520                              globals->get_ephem()->getPlanets(),
 521                              globals->get_ephem()->getNumStars(),
 522                              globals->get_ephem()->getStars() );
 523
 524             /* cout << "thesky->reposition( view_pos = " << view_pos[0] << " "
 525                  << view_pos[1] << " " << view_pos[2] << endl;
 526             cout << "    zero_elev = " << zero_elev[0] << " "
 527                  << zero_elev[1] << " " << zero_elev[2]
 528                  << " lon = " << cur_fdm_state->get_Longitude()
 529                  << " lat = " << cur_fdm_state->get_Latitude() << endl;
 530             cout << "    sun_rot = " << cur_light_params.sun_rotation
 531                  << " gst = " << SGTime::cur_time_params->getGst() << endl;
 532             cout << "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 533                  << " sun dec = " << globals->get_ephem()->getSunDeclination()
 534                  << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 535                  << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 536
 537             thesky->reposition( current__view->get_view_pos(),
 538                                 current__view->get_zero_elev(),
 539                                 current__view->get_world_up(),
 540                                 current__view->getLongitude_deg()
 541                                   * SGD_DEGREES_TO_RADIANS,
 542                                 current__view->getLatitude_deg()
 543                                   * SGD_DEGREES_TO_RADIANS,
 544                                 current__view->getAltitudeASL_ft() * SG_FEET_TO_METER,
 545                                 cur_light_params.sun_rotation,
 546                                 globals->get_time_params()->getGst(),
 547                                 globals->get_ephem()->getSunRightAscension(),
 548                                 globals->get_ephem()->getSunDeclination(),
 549                                 50000.0,
 550                                 globals->get_ephem()->getMoonRightAscension(),
 551                                 globals->get_ephem()->getMoonDeclination(),
 552                                 50000.0 );
 553         }
 554
 555         glEnable( GL_DEPTH_TEST );
 556         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 557             glEnable( GL_FOG );
 558             glFogi( GL_FOG_MODE, GL_EXP2 );
 559             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 560         }
 561
 562         // set sun/lighting parameters
 563         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 564
 565         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 566         // we only update GL_AMBIENT for our lights we will never get
 567         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 568         // explicitely to black.
 569         GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 570         GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 571         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 572
 573         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 574         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 575         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 576
 577         // texture parameters
 578         // glEnable( GL_TEXTURE_2D );
 579         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 580         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 581
 582         // glMatrixMode( GL_PROJECTION );
 583         // glLoadIdentity();
 584         ssgSetFOV( current__view->get_h_fov(),
 585                    current__view->get_v_fov() );
 586
 587         double agl =
 588             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 589             - globals->get_scenery()->get_cur_elev();
 590
 591         if ( agl > 10.0 ) {
 592             scene_nearplane = 10.0f;
 593             scene_farplane = 120000.0f;
 594         } else {
 595             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 596             scene_farplane = 120000.0f;
 597         }
 598
 599         ssgSetNearFar( scene_nearplane, scene_farplane );
 600
 601         // $$$ begin - added VS Renganthan 17 Oct 2K
 602         if(objc)
 603           fgUpdateDCS();
 604         // $$$ end - added VS Renganthan 17 Oct 2K
 605
 606 # ifdef FG_NETWORK_OLK
 607         if ( fgGetBool("/sim/networking/network-olk") ) {
 608             sgCoord fgdpos;
 609             other = head->next;             /* put listpointer to start  */
 610             while ( other != tail) {        /* display all except myself */
 611                 if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 612                     other->fgd_sel->select(1);
 613                     sgSetCoord( &fgdpos, other->sgFGD_COORD );
 614                     other->fgd_pos->setTransform( &fgdpos );
 615                 }
 616                 other = other->next;
 617             }
 618
 619             // fgd_sel->select(1);
 620             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 621             // sgCoord fgdpos;
 622             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 623             // fgd_pos->setTransform( &fgdpos);
 624         }
 625 # endif
 626
 627         // position tile nodes and update range selectors
 628
 629         // this is done in the main loop now...
 630         // global_tile_mgr.prep_ssg_nodes(visibility_meters);
 631
 632         if ( fgGetBool("/sim/rendering/skyblend") ) {
 633             // draw the sky backdrop
 634
 635             // we need a white diffuse light for the phase of the moon
 636             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 637
 638             thesky->preDraw();
 639
 640             // return to the desired diffuse color
 641             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 642         }
 643
 644         // draw the ssg scene
 645         glEnable( GL_DEPTH_TEST );
 646
 647         ssgSetNearFar( scene_nearplane, scene_farplane );
 648         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 649
 650         // This is a bit kludgy.  Every 200 frames, do an extra
 651         // traversal of the scene graph without drawing anything, but
 652         // with the field-of-view set to 360x360 degrees.  This
 653         // ensures that out-of-range random objects that are not in
 654         // the current view frustum will still be freed properly.
 655         static int counter = 0;
 656         counter++;
 657         if (counter == 200) {
 658           sgFrustum f;
 659           f.setFOV(360, 360);
 660                                 // No need to put the near plane too close;
 661                                 // this way, at least the aircraft can be
 662                                 // culled.
 663           f.setNearFar(1000, 1000000);
 664           sgMat4 m;
 665           ssgGetModelviewMatrix(m);
 666           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 667           counter = 0;
 668         }
 669
 670         // change state for lighting here
 671
 672         // draw lighting
 673         // Set punch through fog density
 674         glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 675
 676 #ifdef FG_EXPERIMENTAL_LIGHTING
 677         // Enable states for drawing points with GL_extension
 678         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 679             glEnable(GL_POINT_SMOOTH);
 680             float quadratic[3] = {1.0, 0.01, 0.0001};
 681             // get the address of our OpenGL extensions
 682 #if !defined(sgi)
 683             glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
 684                 wglGetProcAddress("glPointParameterfEXT");
 685             glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
 686                 wglGetProcAddress("glPointParameterfvEXT");
 687 #endif
 688             // makes the points fade as they move away
 689             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 690             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 691             glPointSize(4.0);
 692
 693             // Enable states for drawing runway lights with spherical mapping
 694             glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 695             glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 696             glEnable(GL_TEXTURE_GEN_S);
 697             glEnable(GL_TEXTURE_GEN_T);
 698
 699             //Maybe this is not the best way, but it works !!
 700             glPolygonMode(GL_FRONT, GL_POINT);
 701             glCullFace(GL_BACK);
 702             glEnable(GL_CULL_FACE);
 703         }
 704
 705         glDisable( GL_LIGHTING );
 706         // blending function for runway lights
 707         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 708         glEnable(GL_BLEND);
 709 #endif
 710
 711         ssgSetNearFar( scene_nearplane, scene_farplane );
 712         ssgCullAndDraw( globals->get_scenery()->get_lighting() );
 713
 714
 715 #ifdef FG_EXPERIMENTAL_LIGHTING
 716         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 717             // Disable states used for runway lighting
 718             glPolygonMode(GL_FRONT, GL_FILL);
 719
 720             glDisable(GL_TEXTURE_GEN_S);
 721             glDisable(GL_TEXTURE_GEN_T);
 722             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 723                                   default_attenuation);
 724         }
 725
 726         glPointSize(1.0);
 727 #endif
 728
 729         if ( fgGetBool("/sim/rendering/skyblend") ) {
 730             // draw the sky cloud layers
 731           if (fgGetBool("/environment/clouds/status"))
 732             thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 733         }
 734
 735         globals->get_model_mgr()->draw();
 736         globals->get_aircraft_model()->draw();
 737
 738         // display HUD && Panel
 739         glDisable( GL_FOG );
 740         glDisable( GL_DEPTH_TEST );
 741         // glDisable( GL_CULL_FACE );
 742         // glDisable( GL_TEXTURE_2D );
 743
 744         // update the input subsystem
 745         current_input.update(delta_time_sec);
 746
 747         // update the controls subsystem
 748         globals->get_controls()->update(delta_time_sec);
 749
 750         hud_and_panel->apply();
 751         fgCockpitUpdate();
 752
 753         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 754         // This only works properly if called before the panel call
 755         globals->get_ATC_display()->update(delta_time_sec);
 756
 757         // update the panel subsystem
 758         if ( current_panel != NULL ) {
 759             current_panel->update(delta_time_sec);
 760         }
 761
 762         // We can do translucent menus, so why not. :-)
 763         menus->apply();
 764         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 765         puDisplay();
 766         // glDisable ( GL_BLEND ) ;
 767
 768         // glEnable( GL_FOG );
 769
 770         globals->get_logger()->update(delta_time_sec);
 771     }
 772
 773     glutSwapBuffers();
 774 }
 775
 776
 777 // Update internal time dependent calculations (i.e. flight model)
 778 // FIXME: this distinction is obsolete; all subsystems now get delta
 779 // time on update.
 780 void fgUpdateTimeDepCalcs() {
 781     static bool inited = false;
 782
 783     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 784
 785     fgLIGHT *l = &cur_light_params;
 786     int i;
 787
 788     long multi_loop = 1;
 789
 790     // Initialize the FDM here if it hasn't been and if we have a
 791     // scenery elevation hit.
 792
 793     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 794     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 795
 796     if ( !cur_fdm_state->get_inited() &&
 797          globals->get_scenery()->get_cur_elev() > -9990 )
 798     {
 799         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 800
 801         cur_fdm_state->init();
 802         if ( cur_fdm_state->get_bound() ) {
 803             cur_fdm_state->unbind();
 804         }
 805         cur_fdm_state->bind();
 806     }
 807
 808     // conceptually, the following block could be done for each fdm
 809     // instance ...
 810     if ( !cur_fdm_state->get_inited() ) {
 811         // do nothing, fdm isn't inited yet
 812     } else {
 813         // we have been inited, and  we are good to go ...
 814
 815         if ( !inited ) {
 816             inited = true;
 817         }
 818
 819         globals->get_autopilot()->update(delta_time_sec);
 820         cur_fdm_state->update(delta_time_sec);
 821         globals->get_steam()->update(delta_time_sec);
 822     }
 823
 824     globals->get_model_mgr()->update(delta_time_sec);
 825     globals->get_aircraft_model()->update(delta_time_sec);
 826
 827     // update the view angle
 828     globals->get_viewmgr()->update(delta_time_sec);
 829
 830     l->UpdateAdjFog();
 831
 832     // Update solar system
 833     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 834                                   globals->get_time_params()->getLst(),
 835                                   cur_fdm_state->get_Latitude() );
 836
 837     // Update radio stack model
 838     current_radiostack->update(delta_time_sec);
 839 }
 840
 841
 842 void fgInitTimeDepCalcs( void ) {
 843     // noop for now
 844 }
 845
 846
 847 static const double alt_adjust_ft = 3.758099;
 848 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 849
 850
 851 // What should we do when we have nothing else to do?  Let's get ready
 852 // for the next move and update the display?
 853 static void fgMainLoop( void ) {
 854
 855     // Update the elapsed time.
 856     static bool first_time = true;
 857     if ( first_time ) {
 858         last_time_stamp.stamp();
 859         first_time = false;
 860     }
 861     current_time_stamp.stamp();
 862     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 863     last_time_stamp = current_time_stamp;
 864     globals->inc_sim_time_sec( delta_time_sec );
 865
 866     static const SGPropertyNode *longitude
 867         = fgGetNode("/position/longitude-deg");
 868     static const SGPropertyNode *latitude
 869         = fgGetNode("/position/latitude-deg");
 870     static const SGPropertyNode *altitude
 871         = fgGetNode("/position/altitude-ft");
 872     static const SGPropertyNode *clock_freeze
 873         = fgGetNode("/sim/freeze/clock", true);
 874     static const SGPropertyNode *cur_time_override
 875         = fgGetNode("/sim/time/cur-time-override", true);
 876
 877     static long remainder = 0;
 878     long elapsed;
 879 #ifdef FANCY_FRAME_COUNTER
 880     int i;
 881     double accum;
 882 #else
 883     static time_t last_time = 0;
 884     static int frames = 0;
 885 #endif // FANCY_FRAME_COUNTER
 886
 887     SGTime *t = globals->get_time_params();
 888
 889     FGLocation * acmodel_location = 0;
 890     if(cur_fdm_state->getACModel() != 0) {
 891       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
 892     }
 893
 894     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 895     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 896
 897 #ifdef FG_NETWORK_OLK
 898     if ( fgGetBool("/sim/networking/network-olk") ) {
 899         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
 900             // printf("FGD: Netupdate\n");
 901             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
 902             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
 903         }
 904     }
 905 #endif
 906
 907 #if defined( ENABLE_PLIB_JOYSTICK )
 908     // Read joystick and update control settings
 909     // if ( fgGetString("/sim/control-mode") == "joystick" )
 910     // {
 911     //    fgJoystickRead();
 912     // }
 913 #elif defined( ENABLE_GLUT_JOYSTICK )
 914     // Glut joystick support works by feeding a joystick handler
 915     // function to glut.  This is taken care of once in the joystick
 916     // init routine and we don't have to worry about it again.
 917 #endif
 918
 919 #ifndef FG_WEATHERCM
 920     globals->get_environment_mgr()->update(delta_time_sec);
 921 #endif
 922
 923     // Fix elevation.  I'm just sticking this here for now, it should
 924     // probably move eventually
 925
 926     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
 927            scenery.get_cur_elev(),
 928            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 929            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 930
 931 // Curt is this code used?  I don't see any problems when I comment it out.
 932     if ( acmodel_location != 0 ) {
 933       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
 934         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
 935              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
 936             // now set aircraft altitude above ground
 937             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
 938                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 939                    acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
 940                    acmodel_location->get_cur_elev_m() + alt_adjust_m );
 941             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
 942                                                 + alt_adjust_m) * SG_METER_TO_FEET );
 943             SG_LOG( SG_ALL, SG_DEBUG,
 944                     "<*> resetting altitude to "
 945                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
 946                     << " meters" );
 947         }
 948       }
 949     }
 950 // End of code in question. (see Curt is this code used? above)
 951
 952     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
 953            scenery.get_cur_elev(),
 954            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 955            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 956
 957     // cout << "Warp = " << globals->get_warp() << endl;
 958
 959     // update "time"
 960     static bool last_clock_freeze = false;
 961
 962     if ( clock_freeze->getBoolValue() ) {
 963         // clock freeze requested
 964         if ( cur_time_override->getLongValue() == 0 ) {
 965             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
 966             globals->set_warp( 0 );
 967         }
 968     } else {
 969         // no clock freeze requested
 970         if ( last_clock_freeze == true ) {
 971             // clock just unfroze, let's set warp as the difference
 972             // between frozen time and current time so we don't get a
 973             // time jump (and corresponding sky object and lighting
 974             // jump.)
 975             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
 976             fgSetLong( "/sim/time/cur-time-override", 0 );
 977         }
 978         if ( globals->get_warp_delta() != 0 ) {
 979             globals->inc_warp( globals->get_warp_delta() );
 980         }
 981     }
 982
 983     last_clock_freeze = clock_freeze->getBoolValue();
 984
 985     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 986                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 987                cur_time_override->getLongValue(),
 988                globals->get_warp() );
 989
 990     if ( globals->get_warp_delta() != 0 ) {
 991         fgUpdateSkyAndLightingParams();
 992     }
 993
 994     // update magvar model
 995     globals->get_mag()->update( longitude->getDoubleValue()
 996                                   * SGD_DEGREES_TO_RADIANS,
 997                                 latitude->getDoubleValue()
 998                                   * SGD_DEGREES_TO_RADIANS,
 999                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
1000                                 globals->get_time_params()->getJD() );
1001
1002     // Get elapsed time (in usec) for this past frame
1003     elapsed = fgGetTimeInterval();
1004     SG_LOG( SG_ALL, SG_DEBUG,
1005             "Elapsed time interval is = " << elapsed
1006             << ", previous remainder is = " << remainder );
1007
1008     // Calculate frame rate average
1009 #ifdef FANCY_FRAME_COUNTER
1010     /* old fps calculation */
1011     if ( elapsed > 0 ) {
1012         double tmp;
1013         accum = 0.0;
1014         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1015             tmp = general.get_frame(i);
1016             accum += tmp;
1017             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1018             general.set_frame(i+1,tmp);
1019         }
1020         tmp = 1000000.0 / (float)elapsed;
1021         general.set_frame(0,tmp);
1022         // printf("frame[0] = %.2f\n", general.frames[0]);
1023         accum += tmp;
1024         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1025         // printf("ave = %.2f\n", general.frame_rate);
1026     }
1027 #else
1028     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1029         general.set_frame_rate( frames );
1030         SG_LOG( SG_ALL, SG_DEBUG,
1031                 "--> Frame rate is = " << general.get_frame_rate() );
1032         frames = 0;
1033     }
1034     last_time = t->get_cur_time();
1035     ++frames;
1036 #endif
1037
1038     // Run ATC subsystem
1039     globals->get_ATC_mgr()->update(delta_time_sec);
1040
1041     // Run the AI subsystem
1042     // globals->get_AI_mgr()->update(delta_time_sec);
1043
1044     // Run flight model
1045
1046     // Calculate model iterations needed for next frame
1047     elapsed += remainder;
1048
1049     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1050                               fgGetInt("/sim/model-hz"));
1051     remainder = elapsed - ( (global_multi_loop*1000000) /
1052                             fgGetInt("/sim/model-hz") );
1053     SG_LOG( SG_ALL, SG_DEBUG,
1054             "Model iterations needed = " << global_multi_loop
1055             << ", new remainder = " << remainder );
1056
1057     // chop max interations to something reasonable if the sim was
1058     // delayed for an excesive amount of time
1059     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1060         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1061         remainder = 0;
1062     }
1063
1064     // flight model
1065     if ( global_multi_loop > 0 ) {
1066         fgUpdateTimeDepCalcs();
1067     } else {
1068         SG_LOG( SG_ALL, SG_DEBUG,
1069                 "Elapsed time is zero ... we're zinging" );
1070     }
1071
1072     // Do any I/O channel work that might need to be done
1073     globals->get_io()->update( delta_time_sec );
1074
1075     // see if we need to load any deferred-load textures
1076     material_lib.load_next_deferred();
1077
1078     // Run audio scheduler
1079 #ifdef ENABLE_AUDIO_SUPPORT
1080     if ( fgGetBool("/sim/sound/audible")
1081            && globals->get_soundmgr()->is_working() ) {
1082         globals->get_fx()->update( delta_time_sec );
1083         globals->get_soundmgr()->update( delta_time_sec );
1084     }
1085 #endif
1086
1087     //
1088     // Tile Manager updates - see if we need to load any new scenery tiles.
1089     //   this code ties together the fdm, viewer and scenery classes...
1090     //   we may want to move this to it's own class at some point
1091     //
1092     double visibility_meters = fgGetDouble("/environment/visibility-m");
1093     FGViewer *current_view = globals->get_current_view();
1094
1095     // update tile manager for FDM...
1096     // ...only if location is different than the viewer (to avoid duplicating effort)
1097     if( acmodel_location != current_view->getFGLocation() ) {
1098       if( acmodel_location != 0 ) {
1099         global_tile_mgr.prep_ssg_nodes(visibility_meters,
1100                acmodel_location->get_world_up(),
1101                acmodel_location->get_tile_center());
1102         global_tile_mgr.update( acmodel_location->getLongitude_deg(),
1103                             acmodel_location->getLatitude_deg(),
1104                             visibility_meters,
1105                             acmodel_location->get_absolute_view_pos(),
1106                             acmodel_location->get_current_bucket(),
1107                             acmodel_location->get_previous_bucket(),
1108                             acmodel_location->get_tile_center()
1109                             );
1110         // save results of update in FGLocation for fdm...
1111         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1112           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1113         }
1114         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1115         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1116         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1117       }
1118     }
1119
1120     global_tile_mgr.prep_ssg_nodes(visibility_meters,
1121        current_view->getFGLocation()->get_world_up(),
1122        current_view->getFGLocation()->get_tile_center());
1123     // update tile manager for view...
1124     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1125     // after the FDM's until all of Flight Gear code references the viewer's location
1126     // for elevation instead of the "scenery's" current elevation.
1127     global_tile_mgr.update( current_view->getLongitude_deg(),
1128                             current_view->getLatitude_deg(),
1129                             visibility_meters,
1130                             current_view->get_absolute_view_pos(),
1131                             current_view->getFGLocation()->get_current_bucket(),
1132                             current_view->getFGLocation()->get_previous_bucket(),
1133                             current_view->getFGLocation()->get_tile_center()
1134                             );
1135     // save results of update in FGLocation for fdm...
1136     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1137       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1138     }
1139     current_view->getFGLocation()->set_current_bucket( global_tile_mgr.get_current_bucket() );
1140     current_view->getFGLocation()->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1141     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1142
1143     // If fdm location is same as viewer's then we didn't do the update for fdm location
1144     //   above so we need to save the viewer results in the fdm FGLocation as well...
1145     if( acmodel_location == current_view->getFGLocation() ) {
1146       if( acmodel_location != 0 ) {
1147         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1148           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1149         }
1150         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1151         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1152         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1153       }
1154     }
1155
1156     // END Tile Manager udpates
1157
1158     // redraw display
1159     fgRenderFrame();
1160
1161     SG_LOG( SG_ALL, SG_DEBUG, "" );
1162 }
1163
1164
1165 // This is the top level master main function that is registered as
1166 // our idle funciton
1167
1168 // The first few passes take care of initialization things (a couple
1169 // per pass) and once everything has been initialized fgMainLoop from
1170 // then on.
1171
1172 static void fgIdleFunction ( void ) {
1173     // printf("idle state == %d\n", idle_state);
1174
1175     if ( idle_state == 0 ) {
1176         // Initialize the splash screen right away
1177         if ( fgGetBool("/sim/startup/splash-screen") ) {
1178             fgSplashInit();
1179         }
1180
1181         idle_state++;
1182     } else if ( idle_state == 1 ) {
1183         // Initialize audio support
1184 #ifdef ENABLE_AUDIO_SUPPORT
1185
1186         // Start the intro music
1187         if ( fgGetBool("/sim/startup/intro-music") ) {
1188             SGPath mp3file( globals->get_fg_root() );
1189             mp3file.append( "Sounds/intro.mp3" );
1190
1191             SG_LOG( SG_GENERAL, SG_INFO,
1192                     "Starting intro music: " << mp3file.str() );
1193
1194 #if defined( __CYGWIN__ )
1195             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1196 #elif defined( WIN32 )
1197             string command = "start /m " + mp3file.str();
1198 #else
1199             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1200 #endif
1201
1202             system ( command.c_str() );
1203         }
1204 #endif
1205
1206         idle_state++;
1207     } else if ( idle_state == 2 ) {
1208         // These are a few miscellaneous things that aren't really
1209         // "subsystems" but still need to be initialized.
1210
1211 #ifdef USE_GLIDE
1212         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1213             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1214         }
1215 #endif
1216
1217         idle_state++;
1218     } else if ( idle_state == 3 ) {
1219         // This is the top level init routine which calls all the
1220         // other subsystem initialization routines.  If you are adding
1221         // a subsystem to flightgear, its initialization call should
1222         // located in this routine.
1223         if( !fgInitSubsystems()) {
1224             SG_LOG( SG_GENERAL, SG_ALERT,
1225                     "Subsystem initializations failed ..." );
1226             exit(-1);
1227         }
1228
1229         idle_state++;
1230     } else if ( idle_state == 4 ) {
1231         // setup OpenGL view parameters
1232         fgInitVisuals();
1233
1234         idle_state++;
1235     } else if ( idle_state == 5 ) {
1236
1237         idle_state++;
1238     } else if ( idle_state == 6 ) {
1239         // sleep(1);
1240         idle_state = 1000;
1241
1242         cout << "Panel visible = " << fgPanelVisible() << endl;
1243         fgReshape( fgGetInt("/sim/startup/xsize"),
1244                    fgGetInt("/sim/startup/ysize") );
1245     }
1246
1247     if ( idle_state == 1000 ) {
1248         // We've finished all our initialization steps, from now on we
1249         // run the main loop.
1250
1251         glutIdleFunc(fgMainLoop);
1252     } else {
1253         if ( fgGetBool("/sim/startup/splash-screen") ) {
1254             fgSplashUpdate(0.0);
1255         }
1256     }
1257 }
1258
1259 // options.cxx needs to see this for toggle_panel()
1260 // Handle new window size or exposure
1261 void fgReshape( int width, int height ) {
1262     int view_h;
1263
1264     if ( (!fgGetBool("/sim/virtual-cockpit"))
1265          && fgPanelVisible() && idle_state == 1000 ) {
1266         view_h = (int)(height * (current_panel->getViewHeight() -
1267                                  current_panel->getYOffset()) / 768.0);
1268     } else {
1269         view_h = height;
1270     }
1271
1272     // for all views
1273     FGViewMgr *viewmgr = globals->get_viewmgr();
1274     for ( int i = 0; i < viewmgr->size(); ++i ) {
1275       viewmgr->get_view(i)->
1276         set_aspect_ratio((float)view_h / (float)width);
1277     }
1278
1279     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1280
1281     fgSetInt("/sim/startup/xsize", width);
1282     fgSetInt("/sim/startup/ysize", height);
1283     guiInitMouse(width, height);
1284
1285     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1286                viewmgr->get_current_view()->get_v_fov() );
1287
1288     fgHUDReshape();
1289 }
1290
1291 // Initialize GLUT and define a main window
1292 int fgGlutInit( int *argc, char **argv ) {
1293
1294 #if !defined( macintosh )
1295     // GLUT will extract all glut specific options so later on we only
1296     // need wory about our own.
1297     glutInit(argc, argv);
1298 #endif
1299
1300     // Define Display Parameters
1301     glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1302
1303     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1304             fgGetInt("/sim/startup/xsize") << "x"
1305             << fgGetInt("/sim/startup/ysize") );
1306
1307     // Define initial window size
1308     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1309                         fgGetInt("/sim/startup/ysize") );
1310
1311     // Initialize windows
1312     if ( !fgGetBool("/sim/startup/game-mode")) {
1313         // Open the regular window
1314         glutCreateWindow("FlightGear");
1315 #ifndef GLUT_WRONG_VERSION
1316     } else {
1317         // Open the cool new 'game mode' window
1318         char game_mode_str[256];
1319 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1320 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1321 #ifndef ENUM_CURRENT_SETTINGS
1322 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1323 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1324 #endif
1325
1326         DEVMODE dm;
1327         dm.dmSize = sizeof(DEVMODE);
1328         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1329         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1330         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1331         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1332                                                 fgGetInt("/sim/startup/ysize") );
1333         sprintf( game_mode_str, "%dx%d:%d@%d",
1334                          dm.dmPelsWidth,
1335                          dm.dmPelsHeight,
1336                          dm.dmBitsPerPel,
1337                          dm.dmDisplayFrequency );
1338 #else
1339         // Open the cool new 'game mode' window
1340         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1341                  fgGetInt("/sim/startup/xsize"),
1342                  fgGetInt("/sim/startup/ysize"),
1343                  fgGetInt("/sim/rendering/bits-per-pixel"));
1344
1345 #endif // HAVE_WINDOWS_H
1346         SG_LOG( SG_GENERAL, SG_INFO,
1347                 "game mode params = " << game_mode_str );
1348         glutGameModeString( game_mode_str );
1349         glutEnterGameMode();
1350 #endif // GLUT_WRONG_VERSION
1351     }
1352
1353     // This seems to be the absolute earliest in the init sequence
1354     // that these calls will return valid info.  Too bad it's after
1355     // we've already created and sized out window. :-(
1356     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1357     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1358     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1359     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1360
1361     GLint tmp;
1362     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1363     general.set_glMaxTexSize( tmp );
1364     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1365
1366     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1367     general.set_glDepthBits( tmp );
1368     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1369
1370     return 1;
1371 }
1372
1373
1374 // Initialize GLUT event handlers
1375 int fgGlutInitEvents( void ) {
1376     // call fgReshape() on window resizes
1377     glutReshapeFunc( fgReshape );
1378
1379     // keyboard and mouse callbacks are set in FGInput::init
1380
1381     // call fgMainLoop() whenever there is
1382     // nothing else to do
1383     glutIdleFunc( fgIdleFunction );
1384
1385     // draw the scene
1386     glutDisplayFunc( fgRenderFrame );
1387
1388     return 1;
1389 }
1390
1391
1392 // Main loop
1393 int mainLoop( int argc, char **argv ) {
1394
1395 #if defined( macintosh )
1396     freopen ("stdout.txt", "w", stdout );
1397     freopen ("stderr.txt", "w", stderr );
1398     argc = ccommand( &argv );
1399 #endif
1400
1401     // set default log levels
1402     sglog().setLogLevels( SG_ALL, SG_INFO );
1403
1404     string version;
1405 #ifdef FLIGHTGEAR_VERSION
1406     version = FLIGHTGEAR_VERSION;
1407 #else
1408     version = "unknown version";
1409 #endif
1410     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1411             << version );
1412     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1413
1414     // Allocate global data structures.  This needs to happen before
1415     // we parse command line options
1416
1417     globals = new FGGlobals;
1418
1419 #ifndef FG_WEATHERCM
1420     globals->set_environment_mgr(new FGEnvironmentMgr);
1421 #endif
1422
1423     // seed the random number generater
1424     sg_srandom_time();
1425
1426     SGRoute *route = new SGRoute;
1427     globals->set_route( route );
1428
1429     FGControls *controls = new FGControls;
1430     globals->set_controls( controls );
1431
1432     FGSteam *steam = new FGSteam;
1433     globals->set_steam( steam );
1434
1435     string_list *col = new string_list;
1436     globals->set_channel_options_list( col );
1437
1438     // Scan the config file(s) and command line options to see if
1439     // fg_root was specified (ignore all other options for now)
1440     fgInitFGRoot(argc, argv);
1441
1442     // Check for the correct base package version
1443     static char required_version[] = "0.7.11pre1";
1444     string base_version = fgBasePackageVersion();
1445     if ( !(base_version == required_version) ) {
1446         // tell the operator how to use this application
1447         fgUsage();
1448
1449         SG_LOG( SG_GENERAL, SG_ALERT, "Base package check failed ... "
1450                 << "Found version " << base_version << " at: "
1451                 << globals->get_fg_root() );
1452         SG_LOG( SG_GENERAL, SG_ALERT, "Please upgrade to version"
1453                 << required_version);
1454         exit(-1);
1455     }
1456
1457     // Initialize the Aircraft directory to "" (UIUC)
1458     aircraft_dir = "";
1459
1460     // Load the configuration parameters
1461     if ( !fgInitConfig(argc, argv) ) {
1462         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1463         exit(-1);
1464     }
1465
1466     // Initialize the Window/Graphics environment.
1467     if( !fgGlutInit(&argc, argv) ) {
1468         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1469         exit(-1);
1470     }
1471
1472     // Initialize the various GLUT Event Handlers.
1473     if( !fgGlutInitEvents() ) {
1474         SG_LOG( SG_GENERAL, SG_ALERT,
1475                 "GLUT event handler initialization failed ..." );
1476         exit(-1);
1477     }
1478
1479     // Initialize plib net interface
1480     netInit( &argc, argv );
1481
1482     // Initialize ssg (from plib).  Needs to come before we do any
1483     // other ssg stuff, but after opengl/glut has been initialized.
1484     ssgInit();
1485
1486     // Initialize the user interface (we need to do this before
1487     // passing off control to glut and before fgInitGeneral to get our
1488     // fonts !!!
1489     guiInit();
1490
1491 #ifdef GL_EXT_texture_lod_bias
1492     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1493 #endif
1494
1495     // Set position relative to glide slope if requested
1496     fgSetPosFromGlideSlope();
1497
1498     // If we have an explicit, in-range lon/lat, use it.
1499     // If not, check for an airport-id and use that.
1500     // If not, default to the middle of the KSFO field.
1501     // The default values for lon/lat are deliberately out of range
1502     // so that the airport-id can take effect; valid lon/lat will
1503     // override airport-id, however.
1504     double lon_deg = fgGetDouble("/position/longitude-deg");
1505     double lat_deg = fgGetDouble("/position/latitude-deg");
1506     if (lon_deg < -180 || lon_deg > 180 || lat_deg < -90 || lat_deg > 90) {
1507       if ( fgGetString("/sim/startup/airport-id")[0] != '\0' ) {
1508         fgSetPosFromAirportIDandHdg( fgGetString("/sim/startup/airport-id"),
1509                                      fgGetDouble("/orientation/heading-deg") );
1510         // set tower position (a little off the heading for single
1511         // runway airports)
1512         fgSetTowerPosFromAirportID( fgGetString("/sim/startup/airport-id"),
1513                                     fgGetDouble("orientation/heading") );
1514       } else {
1515                                 // Default to middle of KSFO field
1516         fgSetDouble("/position/longitude-deg", -122.374843);
1517         fgSetDouble("/position/latitude-deg", 37.619002);
1518       }
1519     }
1520
1521     SGTime *t = fgInitTime();
1522     globals->set_time_params( t );
1523
1524     // Do some quick general initializations
1525     if( !fgInitGeneral()) {
1526         SG_LOG( SG_GENERAL, SG_ALERT,
1527                 "General initializations failed ..." );
1528         exit(-1);
1529     }
1530
1531     SGPath modelpath( globals->get_fg_root() );
1532     ssgModelPath( (char *)modelpath.c_str() );
1533
1534     // Initialize the global scenery manager
1535     globals->set_scenery( new FGScenery );
1536     globals->get_scenery()->init();
1537     globals->get_scenery()->bind();
1538
1539     ////////////////////////////////////////////////////////////////////
1540     // Initialize the general model subsystem.
1541     ////////////////////////////////////////////////////////////////////
1542
1543     globals->set_model_loader(new FGModelLoader);
1544     globals->set_texture_loader(new FGTextureLoader);
1545     globals->set_model_mgr(new FGModelMgr);
1546     globals->get_model_mgr()->init();
1547     globals->get_model_mgr()->bind();
1548
1549     ////////////////////////////////////////////////////////////////////
1550     // Initialize the 3D aircraft model subsystem.
1551     ////////////////////////////////////////////////////////////////////
1552
1553     globals->set_aircraft_model(new FGAircraftModel);
1554     globals->get_aircraft_model()->init();
1555     globals->get_aircraft_model()->bind();
1556
1557     ////////////////////////////////////////////////////////////////////
1558     // Initialize the view manager subsystem.
1559     ////////////////////////////////////////////////////////////////////
1560
1561     FGViewMgr *viewmgr = new FGViewMgr;
1562     globals->set_viewmgr( viewmgr );
1563     viewmgr->init();
1564     viewmgr->bind();
1565
1566
1567     // Initialize the sky
1568     SGPath ephem_data_path( globals->get_fg_root() );
1569     ephem_data_path.append( "Astro" );
1570     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1571     ephem->update( globals->get_time_params()->getMjd(),
1572                    globals->get_time_params()->getLst(),
1573                    0.0 );
1574     globals->set_ephem( ephem );
1575
1576                                 // TODO: move to environment mgr
1577     thesky = new SGSky;
1578     SGPath texture_path(globals->get_fg_root());
1579     texture_path.append("Textures");
1580     texture_path.append("Sky");
1581     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1582       SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1583       thesky->add_cloud_layer(layer);
1584     }
1585
1586
1587     SGPath sky_tex_path( globals->get_fg_root() );
1588     sky_tex_path.append( "Textures" );
1589     sky_tex_path.append( "Sky" );
1590     thesky->texture_path( sky_tex_path.str() );
1591
1592     thesky->build( 550.0, 550.0,
1593                    globals->get_ephem()->getNumPlanets(),
1594                    globals->get_ephem()->getPlanets(), 60000.0,
1595                    globals->get_ephem()->getNumStars(),
1596                    globals->get_ephem()->getStars(), 60000.0 );
1597
1598     // Initialize MagVar model
1599     SGMagVar *magvar = new SGMagVar();
1600     globals->set_mag( magvar );
1601
1602     // airport = new ssgBranch;
1603     // airport->setName( "Airport Lighting" );
1604     // lighting->addKid( airport );
1605
1606     // ADA
1607     fgLoadDCS();
1608     // ADA
1609
1610 #ifdef FG_NETWORK_OLK
1611     // Do the network intialization
1612     if ( fgGetBool("/sim/networking/network-olk") ) {
1613         printf("Multipilot mode %s\n",
1614                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1615     }
1616 #endif
1617
1618     // build our custom render states
1619     fgBuildRenderStates();
1620
1621     // pass control off to the master GLUT event handler
1622     glutMainLoop();
1623
1624     // we never actually get here ... but to avoid compiler warnings,
1625     // etc.
1626     return 0;
1627 }
1628
1629
1630 // $$$ end - added VS Renganathan, 15 Oct 2K
1631 //         - added Venky         , 12 Nov 2K
1632
1633 #if defined(__linux__) && defined(__i386__)
1634
1635 static void handleFPE (int);
1636
1637 static void
1638 initFPE ()
1639 {
1640     fpu_control_t fpe_flags = 0;
1641     _FPU_GETCW(fpe_flags);
1642 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1643 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1644 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1645 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1646 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1647 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1648     _FPU_SETCW(fpe_flags);
1649     signal(SIGFPE, handleFPE);
1650 }
1651
1652 static void
1653 handleFPE (int num)
1654 {
1655   initFPE();
1656   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1657 }
1658 #endif
1659
1660 // Main entry point; catch any exceptions that have made it this far.
1661 int main ( int argc, char **argv ) {
1662
1663     // Enable floating-point exceptions for Linux/x86
1664 #if defined(__linux__) && defined(__i386__)
1665     initFPE();
1666 #endif
1667
1668     // Enable floating-point exceptions for Windows
1669 #if defined( _MSC_VER ) && defined( DEBUG )
1670     // Christian, we should document what this does
1671     _control87( _EM_INEXACT, _MCW_EM );
1672 #endif
1673
1674 #if defined( HAVE_BC5PLUS )
1675     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1676 #endif
1677
1678     // FIXME: add other, more specific
1679     // exceptions.
1680     try {
1681         mainLoop(argc, argv);
1682     } catch (sg_throwable &t) {
1683                                 // We must use cerr rather than
1684                                 // logging, since logging may be
1685                                 // disabled.
1686         cerr << "Fatal error: " << t.getFormattedMessage()
1687              << "\n (received from " << t.getOrigin() << ')' << endl;
1688         exit(1);
1689     }
1690
1691     return 0;
1692 }
1693
1694
1695 void fgLoadDCS(void) {
1696
1697     ssgEntity *ship_obj = NULL;
1698
1699     char obj_filename[25];
1700
1701     for ( int k = 0; k < 32; k++ ) {
1702         ship_pos[k]=NULL;
1703     }
1704
1705     SGPath tile_path( globals->get_fg_root());
1706     tile_path.append( "Scenery" );
1707     tile_path.append( "Objects.txt" );
1708     sg_gzifstream in( tile_path.str() );
1709     if ( ! in.is_open() ) {
1710         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1711     } else {
1712
1713         SGPath modelpath( globals->get_fg_root() );
1714         modelpath.append( "Models" );
1715         modelpath.append( "Geometry" );
1716
1717         SGPath texturepath( globals->get_fg_root() );
1718         texturepath.append( "Models" );
1719         texturepath.append( "Textures" );
1720
1721         ssgModelPath( (char *)modelpath.c_str() );
1722         ssgTexturePath( (char *)texturepath.c_str() );
1723
1724         ship_sel = new ssgSelector;
1725
1726         char c;
1727         while ( ! in.eof() ) {
1728             in >> ::skipws;
1729             if ( in.get( c ) && c == '#' ) {
1730                 in >> skipeol;
1731             } else {
1732                 in.putback(c);
1733                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1734                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1735                    int chj=getchar();*/
1736
1737                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1738                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1739
1740                 ship_pos[objc] = new ssgTransform;
1741
1742                 // type "repeat" in objects.txt to load one more
1743                 // instance of the last object.
1744
1745                 if ( strcmp(obj_filename,"repeat") != 0) {
1746                     ship_obj =
1747                         globals->get_model_loader()->load_model( obj_filename );
1748                 }
1749
1750                 if ( ship_obj != NULL ) {
1751                                         ship_obj->setName(obj_filename);
1752                                 if (objc == 0)
1753                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1754                                         else
1755                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1756                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1757                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1758                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1759                             << obj_filename );
1760                 } else {
1761                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1762                             << obj_filename );
1763                 }
1764
1765                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1766                                 //const char *extn = file_extension ( obj_filename ) ;
1767                                 if ( objc == 1 ){
1768                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1769                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1770                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1771                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1772                                         int ltype[500], light_type;
1773                                         static int ltcount = 0;
1774                                     string token;
1775                                         sgVec3 rway_dir,rway_normal,lightpt;
1776                                         Point3D node;
1777                                         modelpath.append(obj_filename);
1778                                         sg_gzifstream in1( modelpath.str() );
1779                                         if ( ! in1.is_open() ) {
1780                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1781                                         } else {
1782                                                 while ( ! in1.eof() ) {
1783                                                         in1 >> ::skipws;
1784                                                         if ( in1.get( c ) && c == '#' ) {
1785                                                                 in1 >> skipeol;
1786                                                         } else {
1787                                                                 in1.putback(c);
1788                                                                 in1 >> token;
1789                                                                 //cout << token << endl;
1790                                                                 if ( token == "runway" ) {
1791                                                                         in1 >> node;
1792                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1793                                                                 } else if ( token == "edgelight" ) {
1794                                                                         in1 >> node;
1795                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1796                                                                         light_type = 1;
1797                                                                 } else if ( token == "taxi" ) {
1798                                                                         in1 >> node;
1799                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1800                                                                         light_type = 2;
1801                                                                 } else if ( token == "vasi" ) {
1802                                                                         in1 >> node;
1803                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1804                                                                         light_type = 3;
1805                                                                 } else if ( token == "threshold" ) {
1806                                                                         in1 >> node;
1807                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1808                                                                         light_type = 4;
1809                                                                 } else if ( token == "rabbit" ) {
1810                                                                         in1 >> node;
1811                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1812                                                                         light_type = 5;
1813                                                                 } else if ( token == "ols" ) {
1814                                                                         in1 >> node;
1815                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1816                                                                         light_type = 6;
1817                                                                 } else if ( token == "red" ) {
1818                                                                         in1 >> node;
1819                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1820                                                                         light_type = 7;
1821                                                                 } else if ( token == "green" ) {
1822                                                                         in1 >> node;
1823                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1824                                                                         light_type = 8;
1825                                                                 } else if ( token == "lp" ) {
1826                                                                         in1 >> node;
1827                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1828                                                                         lightpoints->add( lightpt );
1829                                                                         lightnormals->add( rway_normal );
1830                                                                         lightdir->add( rway_dir );
1831                                                                         ltype[ltcount]= light_type;
1832                                                                         ltcount++;
1833                                                                 }
1834                                                                 if (in1.eof()) break;
1835                                                         }
1836                                                 }  //while
1837
1838                                                 if ( lightpoints->getNum() ) {
1839                                                         ssgBranch *lightpoints_branch;
1840                                                         long int dummy = -999;
1841                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1842                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1843                                                         dummy_tile->ols_transform = new ssgTransform;
1844
1845                                                         // call function to generate the runway lights
1846                                                         lightpoints_branch =
1847                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1848                                                                                                                                 lightdir, ltype);
1849                                                         lightpoints_brightness->addKid(lightpoints_branch);
1850                                                         lightpoints_transform->addKid(lightpoints_brightness);
1851                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1852                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1853                                                         lightpoints_transform->ref();
1854                                                         globals->get_scenery()->get_gnd_lights_branch()->addKid( lightpoints_transform );
1855                                                 }
1856                                         } //if in1
1857                 } //if objc
1858                                 // end hack for deck lights
1859
1860                 objc++;
1861
1862                 if (in.eof()) break;
1863             }
1864         } // while
1865
1866         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
1867
1868         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
1869     }
1870
1871     return;
1872  }
1873
1874
1875 void fgUpdateDCS (void) {
1876
1877     // double eye_lat,eye_lon,eye_alt;
1878     // static double obj_head;
1879     double sl_radius,obj_latgc;
1880     // float nresultmat[4][4];
1881     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
1882     double bz[3];
1883
1884     // Instantaneous Geodetic Lat/Lon/Alt of moving object
1885     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
1886
1887     // Deck should be the first object in objects.txt in case of fdm=ada
1888
1889     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
1890                 if ((fdm->get_iaux(1))==1)
1891                 {
1892                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
1893                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
1894                         obj_alt[1] = fdm->get_daux(3);
1895                         obj_pitch[1] = fdm->get_faux(1);
1896                         obj_roll[1] = fdm->get_faux(2);
1897                 }
1898     }
1899
1900     for ( int m = 0; m < objc; m++ ) {
1901         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
1902         //int v=getchar();
1903
1904         //Geodetic to Geocentric angles for rotation
1905         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
1906
1907         //moving object gbs-posn in cartesian coords
1908         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
1909         Point3D obj_pos = sgGeodToCart( obj_posn );
1910
1911         // Translate moving object w.r.t eye
1912         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
1913         bz[0]=Objtrans.x();
1914         bz[1]=Objtrans.y();
1915         bz[2]=Objtrans.z();
1916
1917        // rotate dynamic objects for lat,lon & alt and other motion about its axes
1918
1919         sgMat4 sgTRANS;
1920         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
1921
1922         sgVec3 ship_fwd,ship_rt,ship_up;
1923         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
1924         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
1925         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
1926
1927         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
1928         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
1929         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
1930         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
1931         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
1932         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
1933
1934         sgMat4 sgTUX;
1935         sgCopyMat4( sgTUX, sgROT_hdg );
1936         sgPostMultMat4( sgTUX, sgROT_pitch );
1937         sgPostMultMat4( sgTUX, sgROT_roll );
1938         sgPostMultMat4( sgTUX, sgROT_lat );
1939         sgPostMultMat4( sgTUX, sgROT_lon );
1940         sgPostMultMat4( sgTUX, sgTRANS );
1941
1942         sgCoord shippos;
1943         sgSetCoord(&shippos, sgTUX );
1944         ship_pos[m]->setTransform( &shippos );
1945         // temporary hack for deck lights - ultimately should move to PLib (when ??)
1946         if (m == 1) {
1947                 if (lightpoints_transform) {
1948                         lightpoints_transform->setTransform( &shippos );
1949                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
1950                         if ( sun_angle > 89 ) {
1951                                 lightpoints_brightness->select(0x01);
1952                         } else {
1953                                 lightpoints_brightness->select(0x00);
1954                         }
1955                 }
1956
1957                 float elev;
1958                 sgVec3 rp,to;
1959                 float *vp;
1960                 float alt;
1961                 float ref_elev;
1962                 sgXformPnt3( rp, rway_ols, sgTUX );
1963                 vp = globals->get_current_view()->get_view_pos();
1964             to[0] = rp[0]-vp[0];
1965             to[1] = rp[1]-vp[1];
1966             to[2] = rp[2]-vp[2];
1967                 float dist = sgLengthVec3( to );
1968                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
1969
1970                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
1971
1972             ref_elev = elev - 3.75; // +ve above, -ve below
1973
1974                 unsigned int sel;
1975                 sel = 0xFF;
1976 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1977 //              if (ref_elev > 0.51) sel = 0x21;
1978 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
1979 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
1980 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
1981 //              if (ref_elev < -0.51) sel = 0x30;
1982 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1983                 dummy_tile->lightmaps_sequence->select(sel);
1984
1985                 sgVec3 up;
1986                 sgCopyVec3 (up, ship_up);
1987                 if (dist > 750)
1988                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
1989                 else
1990                         sgScaleVec3 (up, 4.0*ref_elev);
1991                 dummy_tile->ols_transform->setTransform(up);
1992                 //cout << "ref_elev  " << ref_elev << endl;
1993         }
1994     // end hack for deck lights
1995
1996     }
1997     if ( ship_sel != NULL ) {
1998         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
1999     }
2000 }
2001
2002 // $$$ end - added VS Renganathan, 15 Oct 2K
2003 //           added Venky         , 12 Nov 2K