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 #include <Autopilot/newauto.hxx>
  95
  96 #include <Cockpit/cockpit.hxx>
  97 #include <Cockpit/radiostack.hxx>
  98 #include <Cockpit/steam.hxx>
  99
 100 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 101 #include <GUI/gui.h>
 102 #include <Model/acmodel.hxx>
 103 #include <Model/loader.hxx>
 104 #include <Model/model.hxx>
 105 #include <Model/modelmgr.hxx>
 106 #include <Main/location.hxx>
 107 #ifdef FG_NETWORK_OLK
 108 #include <NetworkOLK/network.h>
 109 #endif
 110 #include <Objects/matlib.hxx>
 111 #include <Scenery/scenery.hxx>
 112 #include <Scenery/tilemgr.hxx>
 113 #ifdef ENABLE_AUDIO_SUPPORT
 114 #  include <Sound/soundmgr.hxx>
 115 #  include <Sound/fg_fx.hxx>
 116 #  include <Sound/morse.hxx>
 117 #endif
 118 #include <Time/FGEventMgr.hxx>
 119 #include <Time/fg_timer.hxx>
 120 #include <Time/light.hxx>
 121 #include <Time/sunpos.hxx>
 122 #include <Time/tmp.hxx>
 123
 124 #include <Input/input.hxx>
 125
 126 // ADA
 127 #include <simgear/misc/sgstream.hxx>
 128 #include <simgear/math/point3d.hxx>
 129 #include <FDM/flight.hxx>
 130 #include <FDM/ADA.hxx>
 131 #include <Scenery/tileentry.hxx>
 132
 133 #if !defined(sgi)
 134 // PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 135 // PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 136 #endif
 137 float default_attenuation[3] = {1.0, 0.0, 0.0};
 138 //Required for using GL_extensions
 139 void fgLoadDCS (void);
 140 void fgUpdateDCS (void);
 141 ssgSelector *ship_sel=NULL;
 142 // upto 32 instances of a same object can be loaded.
 143 ssgTransform *ship_pos[32];
 144 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 145 int objc=0;
 146 ssgSelector *lightpoints_brightness = new ssgSelector;
 147 ssgTransform *lightpoints_transform = new ssgTransform;
 148 FGTileEntry *dummy_tile;
 149 sgVec3 rway_ols;
 150 // ADA
 151 // Clip plane settings...
 152 float scene_nearplane = 0.5f;
 153 float scene_farplane = 120000.0f;
 154
 155 static double delta_time_sec = 0;
 156
 157
 158 #ifdef FG_WEATHERCM
 159 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 160 #else
 161 #  include <Environment/environment_mgr.hxx>
 162 #endif
 163
 164 #include "version.h"
 165
 166 #include "fg_init.hxx"
 167 #include "fg_io.hxx"
 168 #include "fg_props.hxx"
 169 #include "globals.hxx"
 170 #include "splash.hxx"
 171 #include "viewmgr.hxx"
 172 #include "options.hxx"
 173 #include "logger.hxx"
 174
 175 #ifdef macintosh
 176 #  include <console.h>          // -dw- for command line dialog
 177 #endif
 178
 179
 180 FGEventMgr global_events;
 181
 182 // This is a record containing a bit of global housekeeping information
 183 FGGeneral general;
 184
 185 // Specify our current idle function state.  This is used to run all
 186 // our initializations out of the glutIdleLoop() so that we can get a
 187 // splash screen up and running right away.
 188 static int idle_state = 0;
 189 static long global_multi_loop;
 190
 191 // forward declaration
 192 void fgReshape( int width, int height );
 193
 194 // fog constants.  I'm a little nervous about putting actual code out
 195 // here but it seems to work (?)
 196 static const double m_log01 = -log( 0.01 );
 197 static const double sqrt_m_log01 = sqrt( m_log01 );
 198 static GLfloat fog_exp_density;
 199 static GLfloat fog_exp2_density;
 200 static GLfloat fog_exp2_punch_through;
 201
 202 #ifdef FG_NETWORK_OLK
 203 ssgSelector *fgd_sel = NULL;
 204 ssgTransform *fgd_pos = NULL;
 205 #endif
 206
 207 // current fdm/position used for view
 208 FGInterface cur_view_fdm;
 209
 210 // Sky structures
 211 SGSky *thesky;
 212
 213 // hack
 214 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 215 {
 216   {  1.0f,  0.0f,  0.0f,  0.0f },
 217   {  0.0f,  0.0f, -1.0f,  0.0f },
 218   {  0.0f,  1.0f,  0.0f,  0.0f },
 219   {  0.0f,  0.0f,  0.0f,  1.0f }
 220 };
 221
 222 // The following defines flightgear options. Because glutlib will also
 223 // want to parse its own options, those options must not be included here
 224 // or they will get parsed by the main program option parser. Hence case
 225 // is significant for any option added that might be in conflict with
 226 // glutlib's parser.
 227 //
 228 // glutlib parses for:
 229 //    -display
 230 //    -direct   (invalid in Win32)
 231 //    -geometry
 232 //    -gldebug
 233 //    -iconized
 234 //    -indirect (invalid in Win32)
 235 //    -synce
 236 //
 237 // Note that glutlib depends upon strings while this program's
 238 // option parser wants only initial characters followed by numbers
 239 // or pathnames.
 240 //
 241
 242
 243 ssgSimpleState *default_state;
 244 ssgSimpleState *hud_and_panel;
 245 ssgSimpleState *menus;
 246
 247 SGTimeStamp last_time_stamp;
 248 SGTimeStamp current_time_stamp;
 249
 250 void fgBuildRenderStates( void ) {
 251     default_state = new ssgSimpleState;
 252     default_state->ref();
 253     default_state->disable( GL_TEXTURE_2D );
 254     default_state->enable( GL_CULL_FACE );
 255     default_state->enable( GL_COLOR_MATERIAL );
 256     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 257     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 258     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 259     default_state->disable( GL_BLEND );
 260     default_state->disable( GL_ALPHA_TEST );
 261     default_state->disable( GL_LIGHTING );
 262
 263     hud_and_panel = new ssgSimpleState;
 264     hud_and_panel->ref();
 265     hud_and_panel->disable( GL_CULL_FACE );
 266     hud_and_panel->disable( GL_TEXTURE_2D );
 267     hud_and_panel->disable( GL_LIGHTING );
 268     hud_and_panel->enable( GL_BLEND );
 269
 270     menus = new ssgSimpleState;
 271     menus->ref();
 272     menus->disable( GL_CULL_FACE );
 273     menus->disable( GL_TEXTURE_2D );
 274     menus->enable( GL_BLEND );
 275 }
 276
 277
 278 // fgInitVisuals() -- Initialize various GL/view parameters
 279 void fgInitVisuals( void ) {
 280     fgLIGHT *l;
 281
 282     l = &cur_light_params;
 283
 284 #ifndef GLUT_WRONG_VERSION
 285     // Go full screen if requested ...
 286     if ( fgGetBool("/sim/startup/fullscreen") ) {
 287         glutFullScreen();
 288     }
 289 #endif
 290
 291     // If enabled, normal vectors specified with glNormal are scaled
 292     // to unit length after transformation.  Enabling this has
 293     // performance implications.  See the docs for glNormal.
 294     // glEnable( GL_NORMALIZE );
 295
 296     glEnable( GL_LIGHTING );
 297     glEnable( GL_LIGHT0 );
 298     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 299
 300     sgVec3 sunpos;
 301     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 302     ssgGetLight( 0 ) -> setPosition( sunpos );
 303
 304     glFogi (GL_FOG_MODE, GL_EXP2);
 305     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 306          (!fgGetBool("/sim/rendering/shading"))) {
 307         // if fastest fog requested, or if flat shading force fastest
 308         glHint ( GL_FOG_HINT, GL_FASTEST );
 309     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 310         glHint ( GL_FOG_HINT, GL_NICEST );
 311     }
 312     if ( fgGetBool("/sim/rendering/wireframe") ) {
 313         // draw wire frame
 314         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 315     }
 316
 317     // This is the default anyways, but it can't hurt
 318     glFrontFace ( GL_CCW );
 319
 320     // Just testing ...
 321     // glEnable(GL_POINT_SMOOTH);
 322     // glEnable(GL_LINE_SMOOTH);
 323     // glEnable(GL_POLYGON_SMOOTH);
 324 }
 325
 326
 327 // For HiRes screen Dumps using Brian Pauls TR Library
 328 void trRenderFrame( void ) {
 329
 330     if ( fgPanelVisible() ) {
 331         GLfloat height = fgGetInt("/sim/startup/ysize");
 332         GLfloat view_h =
 333             (current_panel->getViewHeight() - current_panel->getYOffset())
 334             * (height / 768.0) + 1;
 335         glTranslatef( 0.0, view_h, 0.0 );
 336     }
 337
 338     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 339     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 340
 341     fgLIGHT *l = &cur_light_params;
 342
 343     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 344                  l->adj_fog_color[2], l->adj_fog_color[3]);
 345
 346     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 347
 348     // set the opengl state to known default values
 349     default_state->force();
 350
 351     glEnable( GL_FOG );
 352     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 353     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 354     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 355
 356     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 357     // we only update GL_AMBIENT for our lights we will never get
 358     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 359     // explicitely to black.
 360     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 361
 362     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 363
 364     // texture parameters
 365     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 366     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 367
 368     // we need a white diffuse light for the phase of the moon
 369     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 370     thesky->preDraw();
 371
 372     // draw the ssg scene
 373     // return to the desired diffuse color
 374     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 375     glEnable( GL_DEPTH_TEST );
 376     ssgSetNearFar( scene_nearplane, scene_farplane );
 377     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 378
 379     // draw the lights
 380     glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 381     ssgSetNearFar( scene_nearplane, scene_farplane );
 382     ssgCullAndDraw( globals->get_scenery()->get_lighting() );
 383
 384     if (fgGetBool("/environment/clouds/status"))
 385       thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 386
 387     globals->get_model_mgr()->draw();
 388     globals->get_aircraft_model()->draw();
 389
 390     // need to do this here as hud_and_panel state is static to
 391     // main.cxx  and HUD and Panel routines have to be called with
 392     // knowledge of the the TR struct < see gui.cxx::HighResDump()
 393     hud_and_panel->apply();
 394 }
 395
 396
 397 // Update all Visuals (redraws anything graphics related)
 398 void fgRenderFrame() {
 399
 400     // Process/manage pending events
 401     global_events.update( delta_time_sec );
 402
 403     static const SGPropertyNode *longitude
 404         = fgGetNode("/position/longitude-deg");
 405     static const SGPropertyNode *latitude
 406         = fgGetNode("/position/latitude-deg");
 407     static const SGPropertyNode *altitude
 408         = fgGetNode("/position/altitude-ft");
 409     static const SGPropertyNode *groundlevel_nearplane
 410         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 411
 412     // Update the default (kludged) properties.
 413     fgUpdateProps();
 414
 415     FGViewer *current__view = globals->get_current_view();
 416
 417     fgLIGHT *l = &cur_light_params;
 418     static double last_visibility = -9999;
 419
 420     // update fog params
 421     double actual_visibility       = thesky->get_visibility();
 422     if ( actual_visibility != last_visibility ) {
 423         last_visibility = actual_visibility;
 424
 425         fog_exp_density = m_log01 / actual_visibility;
 426         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 427         fog_exp2_punch_through = sqrt_m_log01 / ( actual_visibility * 2.5 );
 428     }
 429
 430     // double angle;
 431     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 432     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 433     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 434     // GLfloat mat_shininess[] = { 10.0 };
 435     GLbitfield clear_mask;
 436
 437     if ( idle_state != 1000 ) {
 438         // still initializing, draw the splash screen
 439         if ( fgGetBool("/sim/startup/splash-screen") ) {
 440             fgSplashUpdate(0.0);
 441         }
 442         // Keep resetting sim time while the sim is initializing
 443         globals->set_sim_time_sec( 0.0 );
 444     } else {
 445         // idle_state is now 1000 meaning we've finished all our
 446         // initializations and are running the main loop, so this will
 447         // now work without seg faulting the system.
 448
 449         // calculate our current position in cartesian space
 450         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 451
 452         // update view port
 453         fgReshape( fgGetInt("/sim/startup/xsize"),
 454                    fgGetInt("/sim/startup/ysize") );
 455
 456         // set the sun position (done later with ssg calls)
 457         // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 458
 459         clear_mask = GL_DEPTH_BUFFER_BIT;
 460         if ( fgGetBool("/sim/rendering/wireframe") ) {
 461             clear_mask |= GL_COLOR_BUFFER_BIT;
 462         }
 463
 464         if ( fgGetBool("/sim/rendering/skyblend") ) {
 465             if ( fgGetBool("/sim/rendering/textures") ) {
 466                 // glClearColor(black[0], black[1], black[2], black[3]);
 467                 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 468                              l->adj_fog_color[2], l->adj_fog_color[3]);
 469                 clear_mask |= GL_COLOR_BUFFER_BIT;
 470             }
 471         } else {
 472             glClearColor(l->sky_color[0], l->sky_color[1],
 473                          l->sky_color[2], l->sky_color[3]);
 474             clear_mask |= GL_COLOR_BUFFER_BIT;
 475         }
 476         glClear( clear_mask );
 477
 478         // Tell GL we are switching to model view parameters
 479
 480         // I really should create a derived ssg node or use a call
 481         // back or something so that I can draw the sky within the
 482         // ssgCullAndDraw() function, but for now I just mimic what
 483         // ssg does to set up the model view matrix
 484         glMatrixMode(GL_MODELVIEW);
 485         glLoadIdentity();
 486         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 487
 488         // set the opengl state to known default values
 489         default_state->force();
 490
 491         // update fog params if visibility has changed
 492         double visibility_meters = fgGetDouble("/environment/visibility-m");
 493         thesky->set_visibility(visibility_meters);
 494
 495         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 496                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 497                             / (double)fgGetInt("/sim/model-hz") );
 498
 499         // Set correct opengl fog density
 500         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 501
 502         // update the sky dome
 503         if ( fgGetBool("/sim/rendering/skyblend") ) {
 504             /* cout << "thesky->repaint() sky_color = "
 505                  << cur_light_params.sky_color[0] << " "
 506                  << cur_light_params.sky_color[1] << " "
 507                  << cur_light_params.sky_color[2] << " "
 508                  << cur_light_params.sky_color[3] << endl;
 509             cout << "    fog = "
 510                  << cur_light_params.fog_color[0] << " "
 511                  << cur_light_params.fog_color[1] << " "
 512                  << cur_light_params.fog_color[2] << " "
 513                  << cur_light_params.fog_color[3] << endl;
 514             cout << "    sun_angle = " << cur_light_params.sun_angle
 515                  << "    moon_angle = " << cur_light_params.moon_angle
 516                  << endl; */
 517             thesky->repaint( cur_light_params.sky_color,
 518                              cur_light_params.adj_fog_color,
 519                              cur_light_params.sun_angle,
 520                              cur_light_params.moon_angle,
 521                              globals->get_ephem()->getNumPlanets(),
 522                              globals->get_ephem()->getPlanets(),
 523                              globals->get_ephem()->getNumStars(),
 524                              globals->get_ephem()->getStars() );
 525
 526             /* cout << "thesky->reposition( view_pos = " << view_pos[0] << " "
 527                  << view_pos[1] << " " << view_pos[2] << endl;
 528             cout << "    zero_elev = " << zero_elev[0] << " "
 529                  << zero_elev[1] << " " << zero_elev[2]
 530                  << " lon = " << cur_fdm_state->get_Longitude()
 531                  << " lat = " << cur_fdm_state->get_Latitude() << endl;
 532             cout << "    sun_rot = " << cur_light_params.sun_rotation
 533                  << " gst = " << SGTime::cur_time_params->getGst() << endl;
 534             cout << "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 535                  << " sun dec = " << globals->get_ephem()->getSunDeclination()
 536                  << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 537                  << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 538
 539             thesky->reposition( current__view->get_view_pos(),
 540                                 current__view->get_zero_elev(),
 541                                 current__view->get_world_up(),
 542                                 current__view->getLongitude_deg()
 543                                   * SGD_DEGREES_TO_RADIANS,
 544                                 current__view->getLatitude_deg()
 545                                   * SGD_DEGREES_TO_RADIANS,
 546                                 current__view->getAltitudeASL_ft() * SG_FEET_TO_METER,
 547                                 cur_light_params.sun_rotation,
 548                                 globals->get_time_params()->getGst(),
 549                                 globals->get_ephem()->getSunRightAscension(),
 550                                 globals->get_ephem()->getSunDeclination(),
 551                                 50000.0,
 552                                 globals->get_ephem()->getMoonRightAscension(),
 553                                 globals->get_ephem()->getMoonDeclination(),
 554                                 50000.0 );
 555         }
 556
 557         glEnable( GL_DEPTH_TEST );
 558         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 559             glEnable( GL_FOG );
 560             glFogi( GL_FOG_MODE, GL_EXP2 );
 561             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 562         }
 563
 564         // set sun/lighting parameters
 565         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 566
 567         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 568         // we only update GL_AMBIENT for our lights we will never get
 569         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 570         // explicitely to black.
 571         GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 572         GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 573         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 574
 575         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 576         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 577         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 578
 579         // texture parameters
 580         // glEnable( GL_TEXTURE_2D );
 581         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 582         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 583
 584         // glMatrixMode( GL_PROJECTION );
 585         // glLoadIdentity();
 586         ssgSetFOV( current__view->get_h_fov(),
 587                    current__view->get_v_fov() );
 588
 589         double agl =
 590             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 591             - globals->get_scenery()->get_cur_elev();
 592
 593         if ( agl > 10.0 ) {
 594             scene_nearplane = 10.0f;
 595             scene_farplane = 120000.0f;
 596         } else {
 597             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 598             scene_farplane = 120000.0f;
 599         }
 600
 601         ssgSetNearFar( scene_nearplane, scene_farplane );
 602
 603         // $$$ begin - added VS Renganthan 17 Oct 2K
 604         if(objc)
 605           fgUpdateDCS();
 606         // $$$ end - added VS Renganthan 17 Oct 2K
 607
 608 # ifdef FG_NETWORK_OLK
 609         if ( fgGetBool("/sim/networking/network-olk") ) {
 610             sgCoord fgdpos;
 611             other = head->next;             /* put listpointer to start  */
 612             while ( other != tail) {        /* display all except myself */
 613                 if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 614                     other->fgd_sel->select(1);
 615                     sgSetCoord( &fgdpos, other->sgFGD_COORD );
 616                     other->fgd_pos->setTransform( &fgdpos );
 617                 }
 618                 other = other->next;
 619             }
 620
 621             // fgd_sel->select(1);
 622             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 623             // sgCoord fgdpos;
 624             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 625             // fgd_pos->setTransform( &fgdpos);
 626         }
 627 # endif
 628
 629         // position tile nodes and update range selectors
 630
 631         // this is done in the main loop now...
 632         // global_tile_mgr.prep_ssg_nodes(visibility_meters);
 633
 634         if ( fgGetBool("/sim/rendering/skyblend") ) {
 635             // draw the sky backdrop
 636
 637             // we need a white diffuse light for the phase of the moon
 638             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 639
 640             thesky->preDraw();
 641
 642             // return to the desired diffuse color
 643             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 644         }
 645
 646         // draw the ssg scene
 647         glEnable( GL_DEPTH_TEST );
 648
 649         ssgSetNearFar( scene_nearplane, scene_farplane );
 650         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 651
 652         // This is a bit kludgy.  Every 200 frames, do an extra
 653         // traversal of the scene graph without drawing anything, but
 654         // with the field-of-view set to 360x360 degrees.  This
 655         // ensures that out-of-range random objects that are not in
 656         // the current view frustum will still be freed properly.
 657         static int counter = 0;
 658         counter++;
 659         if (counter == 200) {
 660           sgFrustum f;
 661           f.setFOV(360, 360);
 662                                 // No need to put the near plane too close;
 663                                 // this way, at least the aircraft can be
 664                                 // culled.
 665           f.setNearFar(1000, 1000000);
 666           sgMat4 m;
 667           ssgGetModelviewMatrix(m);
 668           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 669           counter = 0;
 670         }
 671
 672         // change state for lighting here
 673
 674         // draw lighting
 675         // Set punch through fog density
 676         glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 677
 678 #ifdef FG_EXPERIMENTAL_LIGHTING
 679         // Enable states for drawing points with GL_extension
 680         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 681             glEnable(GL_POINT_SMOOTH);
 682             float quadratic[3] = {1.0, 0.01, 0.0001};
 683             // get the address of our OpenGL extensions
 684 #if !defined(sgi)
 685             glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
 686                 wglGetProcAddress("glPointParameterfEXT");
 687             glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
 688                 wglGetProcAddress("glPointParameterfvEXT");
 689 #endif
 690             // makes the points fade as they move away
 691             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 692             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 693             glPointSize(4.0);
 694
 695             // Enable states for drawing runway lights with spherical mapping
 696             glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 697             glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 698             glEnable(GL_TEXTURE_GEN_S);
 699             glEnable(GL_TEXTURE_GEN_T);
 700
 701             //Maybe this is not the best way, but it works !!
 702             glPolygonMode(GL_FRONT, GL_POINT);
 703             glCullFace(GL_BACK);
 704             glEnable(GL_CULL_FACE);
 705         }
 706
 707         glDisable( GL_LIGHTING );
 708         // blending function for runway lights
 709         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 710         glEnable(GL_BLEND);
 711 #endif
 712
 713         ssgSetNearFar( scene_nearplane, scene_farplane );
 714         ssgCullAndDraw( globals->get_scenery()->get_lighting() );
 715
 716
 717 #ifdef FG_EXPERIMENTAL_LIGHTING
 718         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 719             // Disable states used for runway lighting
 720             glPolygonMode(GL_FRONT, GL_FILL);
 721
 722             glDisable(GL_TEXTURE_GEN_S);
 723             glDisable(GL_TEXTURE_GEN_T);
 724             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 725                                   default_attenuation);
 726         }
 727
 728         glPointSize(1.0);
 729 #endif
 730
 731         if ( fgGetBool("/sim/rendering/skyblend") ) {
 732             // draw the sky cloud layers
 733           if (fgGetBool("/environment/clouds/status"))
 734             thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 735         }
 736
 737         globals->get_model_mgr()->draw();
 738         globals->get_aircraft_model()->draw();
 739
 740         // display HUD && Panel
 741         glDisable( GL_FOG );
 742         glDisable( GL_DEPTH_TEST );
 743         // glDisable( GL_CULL_FACE );
 744         // glDisable( GL_TEXTURE_2D );
 745
 746         // update the input subsystem
 747         current_input.update(delta_time_sec);
 748
 749         // update the controls subsystem
 750         globals->get_controls()->update(delta_time_sec);
 751
 752         hud_and_panel->apply();
 753         fgCockpitUpdate();
 754
 755         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 756         // This only works properly if called before the panel call
 757         globals->get_ATC_display()->update(delta_time_sec);
 758
 759         // update the panel subsystem
 760         if ( current_panel != NULL ) {
 761             current_panel->update(delta_time_sec);
 762         }
 763
 764         // We can do translucent menus, so why not. :-)
 765         menus->apply();
 766         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 767         puDisplay();
 768         // glDisable ( GL_BLEND ) ;
 769
 770         // glEnable( GL_FOG );
 771
 772         globals->get_logger()->update(delta_time_sec);
 773     }
 774
 775     glutSwapBuffers();
 776 }
 777
 778
 779 // Update internal time dependent calculations (i.e. flight model)
 780 // FIXME: this distinction is obsolete; all subsystems now get delta
 781 // time on update.
 782 void fgUpdateTimeDepCalcs() {
 783     static bool inited = false;
 784
 785     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 786
 787     fgLIGHT *l = &cur_light_params;
 788     int i;
 789
 790     long multi_loop = 1;
 791
 792     // Initialize the FDM here if it hasn't been and if we have a
 793     // scenery elevation hit.
 794
 795     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 796     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 797
 798     if ( !cur_fdm_state->get_inited() &&
 799          globals->get_scenery()->get_cur_elev() > -9990 )
 800     {
 801         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 802
 803         cur_fdm_state->init();
 804         if ( cur_fdm_state->get_bound() ) {
 805             cur_fdm_state->unbind();
 806         }
 807         cur_fdm_state->bind();
 808     }
 809
 810     // conceptually, the following block could be done for each fdm
 811     // instance ...
 812     if ( !cur_fdm_state->get_inited() ) {
 813         // do nothing, fdm isn't inited yet
 814     } else {
 815         // we have been inited, and  we are good to go ...
 816
 817         if ( !inited ) {
 818             inited = true;
 819         }
 820
 821         globals->get_autopilot()->update(delta_time_sec);
 822         cur_fdm_state->update(delta_time_sec);
 823         globals->get_steam()->update(delta_time_sec);
 824     }
 825
 826     if ( !strcmp(fgGetString("/sim/view-mode"), "pilot") ) {
 827         cur_view_fdm = *cur_fdm_state;
 828         // do nothing
 829     }
 830
 831     globals->get_model_mgr()->update(delta_time_sec);
 832     globals->get_aircraft_model()->update(delta_time_sec);
 833
 834     // update the view angle
 835     globals->get_viewmgr()->update(delta_time_sec);
 836
 837     l->UpdateAdjFog();
 838
 839     // Update solar system
 840     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 841                                   globals->get_time_params()->getLst(),
 842                                   cur_fdm_state->get_Latitude() );
 843
 844     // Update radio stack model
 845     current_radiostack->update(delta_time_sec);
 846 }
 847
 848
 849 void fgInitTimeDepCalcs( void ) {
 850     // noop for now
 851 }
 852
 853
 854 static const double alt_adjust_ft = 3.758099;
 855 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 856
 857
 858 // What should we do when we have nothing else to do?  Let's get ready
 859 // for the next move and update the display?
 860 static void fgMainLoop( void ) {
 861
 862     // Update the elapsed time.
 863     current_time_stamp.stamp();
 864     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 865     last_time_stamp = current_time_stamp;
 866     globals->inc_sim_time_sec( delta_time_sec );
 867
 868     static const SGPropertyNode *longitude
 869         = fgGetNode("/position/longitude-deg");
 870     static const SGPropertyNode *latitude
 871         = fgGetNode("/position/latitude-deg");
 872     static const SGPropertyNode *altitude
 873         = fgGetNode("/position/altitude-ft");
 874     static const SGPropertyNode *clock_freeze
 875         = fgGetNode("/sim/freeze/clock", true);
 876     static const SGPropertyNode *cur_time_override
 877         = fgGetNode("/sim/time/cur-time-override", true);
 878
 879     static long remainder = 0;
 880     long elapsed;
 881 #ifdef FANCY_FRAME_COUNTER
 882     int i;
 883     double accum;
 884 #else
 885     static time_t last_time = 0;
 886     static int frames = 0;
 887 #endif // FANCY_FRAME_COUNTER
 888
 889     SGTime *t = globals->get_time_params();
 890
 891     FGLocation * acmodel_location = 0;
 892     if(cur_fdm_state->getACModel() != 0) {
 893       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
 894     }
 895
 896     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 897     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 898
 899 #ifdef FG_NETWORK_OLK
 900     if ( fgGetBool("/sim/networking/network-olk") ) {
 901         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
 902             // printf("FGD: Netupdate\n");
 903             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
 904             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
 905         }
 906     }
 907 #endif
 908
 909 #if defined( ENABLE_PLIB_JOYSTICK )
 910     // Read joystick and update control settings
 911     // if ( fgGetString("/sim/control-mode") == "joystick" )
 912     // {
 913     //    fgJoystickRead();
 914     // }
 915 #elif defined( ENABLE_GLUT_JOYSTICK )
 916     // Glut joystick support works by feeding a joystick handler
 917     // function to glut.  This is taken care of once in the joystick
 918     // init routine and we don't have to worry about it again.
 919 #endif
 920
 921 #ifndef FG_WEATHERCM
 922     globals->get_environment_mgr()->update(delta_time_sec);
 923 #endif
 924
 925     // Fix elevation.  I'm just sticking this here for now, it should
 926     // probably move eventually
 927
 928     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
 929            scenery.get_cur_elev(),
 930            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 931            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 932
 933 // Curt is this code used?  I don't see any problems when I comment it out.
 934     if ( acmodel_location != 0 ) {
 935       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
 936         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
 937              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
 938             // now set aircraft altitude above ground
 939             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
 940                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 941                    acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
 942                    acmodel_location->get_cur_elev_m() + alt_adjust_m );
 943             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
 944                                                 + alt_adjust_m) * SG_METER_TO_FEET );
 945             SG_LOG( SG_ALL, SG_DEBUG,
 946                     "<*> resetting altitude to "
 947                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
 948                     << " meters" );
 949         }
 950       }
 951     }
 952 // End of code in question. (see Curt is this code used? above)
 953
 954     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
 955            scenery.get_cur_elev(),
 956            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 957            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 958
 959     // cout << "Warp = " << globals->get_warp() << endl;
 960
 961     // update "time"
 962     static bool last_clock_freeze = false;
 963
 964     if ( clock_freeze->getBoolValue() ) {
 965         // clock freeze requested
 966         if ( cur_time_override->getLongValue() == 0 ) {
 967             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
 968             globals->set_warp( 0 );
 969         }
 970     } else {
 971         // no clock freeze requested
 972         if ( last_clock_freeze == true ) {
 973             // clock just unfroze, let's set warp as the difference
 974             // between frozen time and current time so we don't get a
 975             // time jump (and corresponding sky object and lighting
 976             // jump.)
 977             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
 978             fgSetLong( "/sim/time/cur-time-override", 0 );
 979         }
 980         if ( globals->get_warp_delta() != 0 ) {
 981             globals->inc_warp( globals->get_warp_delta() );
 982         }
 983     }
 984
 985     last_clock_freeze = clock_freeze->getBoolValue();
 986
 987     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 988                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 989                cur_time_override->getLongValue(),
 990                globals->get_warp() );
 991
 992     if ( globals->get_warp_delta() != 0 ) {
 993         fgUpdateSkyAndLightingParams();
 994     }
 995
 996     // update magvar model
 997     globals->get_mag()->update( longitude->getDoubleValue()
 998                                   * SGD_DEGREES_TO_RADIANS,
 999                                 latitude->getDoubleValue()
1000                                   * SGD_DEGREES_TO_RADIANS,
1001                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
1002                                 globals->get_time_params()->getJD() );
1003
1004     // Get elapsed time (in usec) for this past frame
1005     elapsed = fgGetTimeInterval();
1006     SG_LOG( SG_ALL, SG_DEBUG,
1007             "Elapsed time interval is = " << elapsed
1008             << ", previous remainder is = " << remainder );
1009
1010     // Calculate frame rate average
1011 #ifdef FANCY_FRAME_COUNTER
1012     /* old fps calculation */
1013     if ( elapsed > 0 ) {
1014         double tmp;
1015         accum = 0.0;
1016         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1017             tmp = general.get_frame(i);
1018             accum += tmp;
1019             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1020             general.set_frame(i+1,tmp);
1021         }
1022         tmp = 1000000.0 / (float)elapsed;
1023         general.set_frame(0,tmp);
1024         // printf("frame[0] = %.2f\n", general.frames[0]);
1025         accum += tmp;
1026         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1027         // printf("ave = %.2f\n", general.frame_rate);
1028     }
1029 #else
1030     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1031         general.set_frame_rate( frames );
1032         SG_LOG( SG_ALL, SG_DEBUG,
1033                 "--> Frame rate is = " << general.get_frame_rate() );
1034         frames = 0;
1035     }
1036     last_time = t->get_cur_time();
1037     ++frames;
1038 #endif
1039
1040     // Run ATC subsystem
1041     globals->get_ATC_mgr()->update(delta_time_sec);
1042
1043     // Run the AI subsystem
1044     // globals->get_AI_mgr()->update(delta_time_sec);
1045
1046     // Run flight model
1047
1048     // Calculate model iterations needed for next frame
1049     elapsed += remainder;
1050
1051     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1052                               fgGetInt("/sim/model-hz"));
1053     remainder = elapsed - ( (global_multi_loop*1000000) /
1054                             fgGetInt("/sim/model-hz") );
1055     SG_LOG( SG_ALL, SG_DEBUG,
1056             "Model iterations needed = " << global_multi_loop
1057             << ", new remainder = " << remainder );
1058
1059     // chop max interations to something reasonable if the sim was
1060     // delayed for an excesive amount of time
1061     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1062         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1063         remainder = 0;
1064     }
1065
1066     // flight model
1067     if ( global_multi_loop > 0 ) {
1068         fgUpdateTimeDepCalcs();
1069     } else {
1070         SG_LOG( SG_ALL, SG_DEBUG,
1071                 "Elapsed time is zero ... we're zinging" );
1072     }
1073
1074 #if ! defined( macintosh )
1075     // Do any I/O channel work that might need to be done
1076     fgIOProcess();
1077 #endif
1078
1079     // see if we need to load any deferred-load textures
1080     material_lib.load_next_deferred();
1081
1082     // Run audio scheduler
1083 #ifdef ENABLE_AUDIO_SUPPORT
1084     if ( fgGetBool("/sim/sound/audible")
1085            && globals->get_soundmgr()->is_working() ) {
1086         globals->get_fx()->update(1); // FIXME: use dt
1087         globals->get_soundmgr()->update(1); // FIXME: use dt
1088     }
1089 #endif
1090
1091     //
1092     // Tile Manager updates - see if we need to load any new scenery tiles.
1093     //   this code ties together the fdm, viewer and scenery classes...
1094     //   we may want to move this to it's own class at some point
1095     //
1096     double visibility_meters = fgGetDouble("/environment/visibility-m");
1097     FGViewer *current_view = globals->get_current_view();
1098
1099     // update tile manager for FDM...
1100     // ...only if location is different than the viewer (to avoid duplicating effort)
1101     if( acmodel_location != current_view->getFGLocation() ) {
1102       if( acmodel_location != 0 ) {
1103         global_tile_mgr.prep_ssg_nodes(visibility_meters,
1104                acmodel_location->get_world_up(),
1105                acmodel_location->get_tile_center());
1106         global_tile_mgr.update( acmodel_location->getLongitude_deg(),
1107                             acmodel_location->getLatitude_deg(),
1108                             visibility_meters,
1109                             acmodel_location->get_absolute_view_pos(),
1110                             acmodel_location->get_current_bucket(),
1111                             acmodel_location->get_previous_bucket(),
1112                             acmodel_location->get_tile_center()
1113                             );
1114         // save results of update in FGLocation for fdm...
1115         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1116           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1117         }
1118         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1119         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1120         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1121       }
1122     }
1123
1124     global_tile_mgr.prep_ssg_nodes(visibility_meters,
1125        current_view->getFGLocation()->get_world_up(),
1126        current_view->getFGLocation()->get_tile_center());
1127     // update tile manager for view...
1128     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1129     // after the FDM's until all of Flight Gear code references the viewer's location
1130     // for elevation instead of the "scenery's" current elevation.
1131     global_tile_mgr.update( current_view->getLongitude_deg(),
1132                             current_view->getLatitude_deg(),
1133                             visibility_meters,
1134                             current_view->get_absolute_view_pos(),
1135                             current_view->getFGLocation()->get_current_bucket(),
1136                             current_view->getFGLocation()->get_previous_bucket(),
1137                             current_view->getFGLocation()->get_tile_center()
1138                             );
1139     // save results of update in FGLocation for fdm...
1140     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1141       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1142     }
1143     current_view->getFGLocation()->set_current_bucket( global_tile_mgr.get_current_bucket() );
1144     current_view->getFGLocation()->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1145     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1146
1147     // If fdm location is same as viewer's then we didn't do the update for fdm location
1148     //   above so we need to save the viewer results in the fdm FGLocation as well...
1149     if( acmodel_location == current_view->getFGLocation() ) {
1150       if( acmodel_location != 0 ) {
1151         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1152           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1153         }
1154         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1155         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1156         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1157       }
1158     }
1159
1160     // END Tile Manager udpates
1161
1162     // redraw display
1163     fgRenderFrame();
1164
1165     SG_LOG( SG_ALL, SG_DEBUG, "" );
1166 }
1167
1168
1169 // This is the top level master main function that is registered as
1170 // our idle funciton
1171
1172 // The first few passes take care of initialization things (a couple
1173 // per pass) and once everything has been initialized fgMainLoop from
1174 // then on.
1175
1176 static void fgIdleFunction ( void ) {
1177     // printf("idle state == %d\n", idle_state);
1178
1179     if ( idle_state == 0 ) {
1180         // Initialize the splash screen right away
1181         if ( fgGetBool("/sim/startup/splash-screen") ) {
1182             fgSplashInit();
1183         }
1184
1185         idle_state++;
1186     } else if ( idle_state == 1 ) {
1187         // Initialize audio support
1188 #ifdef ENABLE_AUDIO_SUPPORT
1189
1190         // Start the intro music
1191         if ( fgGetBool("/sim/startup/intro-music") ) {
1192             SGPath mp3file( globals->get_fg_root() );
1193             mp3file.append( "Sounds/intro.mp3" );
1194
1195             SG_LOG( SG_GENERAL, SG_INFO,
1196                     "Starting intro music: " << mp3file.str() );
1197
1198 #if defined( __CYGWIN__ )
1199             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1200 #elif defined( WIN32 )
1201             string command = "start /m " + mp3file.str();
1202 #else
1203             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1204 #endif
1205
1206             system ( command.c_str() );
1207         }
1208 #endif
1209
1210         idle_state++;
1211     } else if ( idle_state == 2 ) {
1212         // These are a few miscellaneous things that aren't really
1213         // "subsystems" but still need to be initialized.
1214
1215 #ifdef USE_GLIDE
1216         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1217             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1218         }
1219 #endif
1220
1221         idle_state++;
1222     } else if ( idle_state == 3 ) {
1223         // This is the top level init routine which calls all the
1224         // other subsystem initialization routines.  If you are adding
1225         // a subsystem to flightgear, its initialization call should
1226         // located in this routine.
1227         if( !fgInitSubsystems()) {
1228             SG_LOG( SG_GENERAL, SG_ALERT,
1229                     "Subsystem initializations failed ..." );
1230             exit(-1);
1231         }
1232
1233         idle_state++;
1234     } else if ( idle_state == 4 ) {
1235         // setup OpenGL view parameters
1236         fgInitVisuals();
1237
1238         idle_state++;
1239     } else if ( idle_state == 5 ) {
1240
1241         idle_state++;
1242     } else if ( idle_state == 6 ) {
1243         // sleep(1);
1244         idle_state = 1000;
1245
1246         cout << "Panel visible = " << fgPanelVisible() << endl;
1247         fgReshape( fgGetInt("/sim/startup/xsize"),
1248                    fgGetInt("/sim/startup/ysize") );
1249     }
1250
1251     if ( idle_state == 1000 ) {
1252         // We've finished all our initialization steps, from now on we
1253         // run the main loop.
1254
1255         glutIdleFunc(fgMainLoop);
1256     } else {
1257         if ( fgGetBool("/sim/startup/splash-screen") ) {
1258             fgSplashUpdate(0.0);
1259         }
1260     }
1261 }
1262
1263 // options.cxx needs to see this for toggle_panel()
1264 // Handle new window size or exposure
1265 void fgReshape( int width, int height ) {
1266     int view_h;
1267
1268     if ( (!fgGetBool("/sim/virtual-cockpit"))
1269          && fgPanelVisible() && idle_state == 1000 ) {
1270         view_h = (int)(height * (current_panel->getViewHeight() -
1271                                  current_panel->getYOffset()) / 768.0);
1272     } else {
1273         view_h = height;
1274     }
1275
1276     // for all views
1277     FGViewMgr *viewmgr = globals->get_viewmgr();
1278     for ( int i = 0; i < viewmgr->size(); ++i ) {
1279       viewmgr->get_view(i)->
1280         set_aspect_ratio((float)view_h / (float)width);
1281     }
1282
1283     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1284
1285     fgSetInt("/sim/startup/xsize", width);
1286     fgSetInt("/sim/startup/ysize", height);
1287     guiInitMouse(width, height);
1288
1289     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1290                viewmgr->get_current_view()->get_v_fov() );
1291
1292     fgHUDReshape();
1293 }
1294
1295 // Initialize GLUT and define a main window
1296 int fgGlutInit( int *argc, char **argv ) {
1297
1298 #if !defined( macintosh )
1299     // GLUT will extract all glut specific options so later on we only
1300     // need wory about our own.
1301     glutInit(argc, argv);
1302 #endif
1303
1304     // Define Display Parameters
1305     glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1306
1307     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1308             fgGetInt("/sim/startup/xsize") << "x"
1309             << fgGetInt("/sim/startup/ysize") );
1310
1311     // Define initial window size
1312     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1313                         fgGetInt("/sim/startup/ysize") );
1314
1315     // Initialize windows
1316     if ( !fgGetBool("/sim/startup/game-mode")) {
1317         // Open the regular window
1318         glutCreateWindow("FlightGear");
1319 #ifndef GLUT_WRONG_VERSION
1320     } else {
1321         // Open the cool new 'game mode' window
1322         char game_mode_str[256];
1323 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1324 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1325 #ifndef ENUM_CURRENT_SETTINGS
1326 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1327 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1328 #endif
1329
1330         DEVMODE dm;
1331         dm.dmSize = sizeof(DEVMODE);
1332         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1333         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1334         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1335         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1336                                                 fgGetInt("/sim/startup/ysize") );
1337         sprintf( game_mode_str, "%dx%d:%d@%d",
1338                          dm.dmPelsWidth,
1339                          dm.dmPelsHeight,
1340                          dm.dmBitsPerPel,
1341                          dm.dmDisplayFrequency );
1342 #else
1343         // Open the cool new 'game mode' window
1344         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1345                  fgGetInt("/sim/startup/xsize"),
1346                  fgGetInt("/sim/startup/ysize"),
1347                  fgGetInt("/sim/rendering/bits-per-pixel"));
1348
1349 #endif // HAVE_WINDOWS_H
1350         SG_LOG( SG_GENERAL, SG_INFO,
1351                 "game mode params = " << game_mode_str );
1352         glutGameModeString( game_mode_str );
1353         glutEnterGameMode();
1354 #endif // GLUT_WRONG_VERSION
1355     }
1356
1357     // This seems to be the absolute earliest in the init sequence
1358     // that these calls will return valid info.  Too bad it's after
1359     // we've already created and sized out window. :-(
1360     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1361     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1362     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1363     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1364
1365     GLint tmp;
1366     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1367     general.set_glMaxTexSize( tmp );
1368     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1369
1370     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1371     general.set_glDepthBits( tmp );
1372     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1373
1374     return 1;
1375 }
1376
1377
1378 // Initialize GLUT event handlers
1379 int fgGlutInitEvents( void ) {
1380     // call fgReshape() on window resizes
1381     glutReshapeFunc( fgReshape );
1382
1383     // keyboard and mouse callbacks are set in FGInput::init
1384
1385     // call fgMainLoop() whenever there is
1386     // nothing else to do
1387     glutIdleFunc( fgIdleFunction );
1388
1389     // draw the scene
1390     glutDisplayFunc( fgRenderFrame );
1391
1392     return 1;
1393 }
1394
1395
1396 // Main loop
1397 int mainLoop( int argc, char **argv ) {
1398
1399 #if defined( macintosh )
1400     freopen ("stdout.txt", "w", stdout );
1401     freopen ("stderr.txt", "w", stderr );
1402     argc = ccommand( &argv );
1403 #endif
1404
1405     // set default log levels
1406     sglog().setLogLevels( SG_ALL, SG_INFO );
1407
1408     string version;
1409 #ifdef FLIGHTGEAR_VERSION
1410     version = FLIGHTGEAR_VERSION;
1411 #else
1412     version = "unknown version";
1413 #endif
1414     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1415             << version );
1416     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1417
1418     // Allocate global data structures.  This needs to happen before
1419     // we parse command line options
1420
1421     globals = new FGGlobals;
1422
1423 #ifndef FG_WEATHERCM
1424     globals->set_environment_mgr(new FGEnvironmentMgr);
1425 #endif
1426
1427     // seed the random number generater
1428     sg_srandom_time();
1429
1430     SGRoute *route = new SGRoute;
1431     globals->set_route( route );
1432
1433     FGControls *controls = new FGControls;
1434     globals->set_controls( controls );
1435
1436     FGSteam *steam = new FGSteam;
1437     globals->set_steam( steam );
1438
1439     string_list *col = new string_list;
1440     globals->set_channel_options_list( col );
1441
1442     // Scan the config file(s) and command line options to see if
1443     // fg_root was specified (ignore all other options for now)
1444     fgInitFGRoot(argc, argv);
1445
1446     // Check for the correct base package version
1447     static char required_version[] = "0.7.11pre1";
1448     string base_version = fgBasePackageVersion();
1449     if ( !(base_version == required_version) ) {
1450         // tell the operator how to use this application
1451         fgUsage();
1452
1453         SG_LOG( SG_GENERAL, SG_ALERT, "Base package check failed ... "
1454                 << "Found version " << base_version << " at: "
1455                 << globals->get_fg_root() );
1456         SG_LOG( SG_GENERAL, SG_ALERT, "Please upgrade to version"
1457                 << required_version);
1458         exit(-1);
1459     }
1460
1461     // Initialize the Aircraft directory to "" (UIUC)
1462     aircraft_dir = "";
1463
1464     // Load the configuration parameters
1465     if ( !fgInitConfig(argc, argv) ) {
1466         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1467         exit(-1);
1468     }
1469
1470     // Initialize the Window/Graphics environment.
1471     if( !fgGlutInit(&argc, argv) ) {
1472         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1473         exit(-1);
1474     }
1475
1476     // Initialize the various GLUT Event Handlers.
1477     if( !fgGlutInitEvents() ) {
1478         SG_LOG( SG_GENERAL, SG_ALERT,
1479                 "GLUT event handler initialization failed ..." );
1480         exit(-1);
1481     }
1482
1483     // Initialize plib net interface
1484     netInit( &argc, argv );
1485
1486     // Initialize ssg (from plib).  Needs to come before we do any
1487     // other ssg stuff, but after opengl/glut has been initialized.
1488     ssgInit();
1489
1490     // Initialize the user interface (we need to do this before
1491     // passing off control to glut and before fgInitGeneral to get our
1492     // fonts !!!
1493     guiInit();
1494
1495 #ifdef GL_EXT_texture_lod_bias
1496     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1497 #endif
1498
1499     // Set position relative to glide slope if requested
1500     fgSetPosFromGlideSlope();
1501
1502     // If we have an explicit, in-range lon/lat, use it.
1503     // If not, check for an airport-id and use that.
1504     // If not, default to the middle of the KSFO field.
1505     // The default values for lon/lat are deliberately out of range
1506     // so that the airport-id can take effect; valid lon/lat will
1507     // override airport-id, however.
1508     double lon_deg = fgGetDouble("/position/longitude-deg");
1509     double lat_deg = fgGetDouble("/position/latitude-deg");
1510     if (lon_deg < -180 || lon_deg > 180 || lat_deg < -90 || lat_deg > 90) {
1511       if ( fgGetString("/sim/startup/airport-id")[0] != '\0' ) {
1512         fgSetPosFromAirportIDandHdg( fgGetString("/sim/startup/airport-id"),
1513                                      fgGetDouble("/orientation/heading-deg") );
1514         // set tower position (a little off the heading for single
1515         // runway airports)
1516         fgSetTowerPosFromAirportID( fgGetString("/sim/startup/airport-id"),
1517                                     fgGetDouble("orientation/heading") );
1518       } else {
1519                                 // Default to middle of KSFO field
1520         fgSetDouble("/position/longitude-deg", -122.374843);
1521         fgSetDouble("/position/latitude-deg", 37.619002);
1522       }
1523     }
1524
1525     SGTime *t = fgInitTime();
1526     globals->set_time_params( t );
1527
1528     // Do some quick general initializations
1529     if( !fgInitGeneral()) {
1530         SG_LOG( SG_GENERAL, SG_ALERT,
1531                 "General initializations failed ..." );
1532         exit(-1);
1533     }
1534
1535     SGPath modelpath( globals->get_fg_root() );
1536     ssgModelPath( (char *)modelpath.c_str() );
1537
1538     // Initialize the global scenery manager
1539     globals->set_scenery( new FGScenery );
1540     globals->get_scenery()->init();
1541     globals->get_scenery()->bind();
1542
1543     ////////////////////////////////////////////////////////////////////
1544     // Initialize the general model subsystem.
1545     ////////////////////////////////////////////////////////////////////
1546
1547     globals->set_model_loader(new FGModelLoader);
1548     globals->set_texture_loader(new FGTextureLoader);
1549     globals->set_model_mgr(new FGModelMgr);
1550     globals->get_model_mgr()->init();
1551     globals->get_model_mgr()->bind();
1552
1553     ////////////////////////////////////////////////////////////////////
1554     // Initialize the 3D aircraft model subsystem.
1555     ////////////////////////////////////////////////////////////////////
1556
1557     globals->set_aircraft_model(new FGAircraftModel);
1558     globals->get_aircraft_model()->init();
1559     globals->get_aircraft_model()->bind();
1560
1561     ////////////////////////////////////////////////////////////////////
1562     // Initialize the view manager subsystem.
1563     ////////////////////////////////////////////////////////////////////
1564
1565     FGViewMgr *viewmgr = new FGViewMgr;
1566     globals->set_viewmgr( viewmgr );
1567     viewmgr->init();
1568     viewmgr->bind();
1569
1570
1571     // Initialize the sky
1572     SGPath ephem_data_path( globals->get_fg_root() );
1573     ephem_data_path.append( "Astro" );
1574     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1575     ephem->update( globals->get_time_params()->getMjd(),
1576                    globals->get_time_params()->getLst(),
1577                    0.0 );
1578     globals->set_ephem( ephem );
1579
1580                                 // TODO: move to environment mgr
1581     thesky = new SGSky;
1582     SGPath texture_path(globals->get_fg_root());
1583     texture_path.append("Textures");
1584     texture_path.append("Sky");
1585     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1586       SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1587       thesky->add_cloud_layer(layer);
1588     }
1589
1590
1591     SGPath sky_tex_path( globals->get_fg_root() );
1592     sky_tex_path.append( "Textures" );
1593     sky_tex_path.append( "Sky" );
1594     thesky->texture_path( sky_tex_path.str() );
1595
1596     thesky->build( 550.0, 550.0,
1597                    globals->get_ephem()->getNumPlanets(),
1598                    globals->get_ephem()->getPlanets(), 60000.0,
1599                    globals->get_ephem()->getNumStars(),
1600                    globals->get_ephem()->getStars(), 60000.0 );
1601
1602     // Initialize MagVar model
1603     SGMagVar *magvar = new SGMagVar();
1604     globals->set_mag( magvar );
1605
1606     // airport = new ssgBranch;
1607     // airport->setName( "Airport Lighting" );
1608     // lighting->addKid( airport );
1609
1610     // ADA
1611     fgLoadDCS();
1612     // ADA
1613
1614 #ifdef FG_NETWORK_OLK
1615     // Do the network intialization
1616     if ( fgGetBool("/sim/networking/network-olk") ) {
1617         printf("Multipilot mode %s\n",
1618                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1619     }
1620 #endif
1621
1622     // build our custom render states
1623     fgBuildRenderStates();
1624
1625     // pass control off to the master GLUT event handler
1626     glutMainLoop();
1627
1628     // we never actually get here ... but to avoid compiler warnings,
1629     // etc.
1630     return 0;
1631 }
1632
1633
1634 // $$$ end - added VS Renganathan, 15 Oct 2K
1635 //         - added Venky         , 12 Nov 2K
1636
1637 #if defined(__linux__) && defined(__i386__)
1638
1639 static void handleFPE (int);
1640
1641 static void
1642 initFPE ()
1643 {
1644     fpu_control_t fpe_flags = 0;
1645     _FPU_GETCW(fpe_flags);
1646 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1647 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1648 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1649 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1650 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1651 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1652     _FPU_SETCW(fpe_flags);
1653     signal(SIGFPE, handleFPE);
1654 }
1655
1656 static void
1657 handleFPE (int num)
1658 {
1659   initFPE();
1660   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1661 }
1662 #endif
1663
1664 // Main entry point; catch any exceptions that have made it this far.
1665 int main ( int argc, char **argv ) {
1666
1667     // Enable floating-point exceptions for Linux/x86
1668 #if defined(__linux__) && defined(__i386__)
1669     initFPE();
1670 #endif
1671
1672     // Enable floating-point exceptions for Windows
1673 #if defined( _MSC_VER ) && defined( DEBUG )
1674     // Christian, we should document what this does
1675     _control87( _EM_INEXACT, _MCW_EM );
1676 #endif
1677
1678 #if defined( HAVE_BC5PLUS )
1679     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1680 #endif
1681
1682     // FIXME: add other, more specific
1683     // exceptions.
1684     try {
1685         mainLoop(argc, argv);
1686     } catch (sg_throwable &t) {
1687                                 // We must use cerr rather than
1688                                 // logging, since logging may be
1689                                 // disabled.
1690         cerr << "Fatal error: " << t.getFormattedMessage()
1691              << "\n (received from " << t.getOrigin() << ')' << endl;
1692         exit(1);
1693     }
1694
1695     return 0;
1696 }
1697
1698
1699 void fgLoadDCS(void) {
1700
1701     ssgEntity *ship_obj = NULL;
1702
1703     char obj_filename[25];
1704
1705     for ( int k = 0; k < 32; k++ ) {
1706         ship_pos[k]=NULL;
1707     }
1708
1709     SGPath tile_path( globals->get_fg_root());
1710     tile_path.append( "Scenery" );
1711     tile_path.append( "Objects.txt" );
1712     sg_gzifstream in( tile_path.str() );
1713     if ( ! in.is_open() ) {
1714         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1715     } else {
1716
1717         SGPath modelpath( globals->get_fg_root() );
1718         modelpath.append( "Models" );
1719         modelpath.append( "Geometry" );
1720
1721         SGPath texturepath( globals->get_fg_root() );
1722         texturepath.append( "Models" );
1723         texturepath.append( "Textures" );
1724
1725         ssgModelPath( (char *)modelpath.c_str() );
1726         ssgTexturePath( (char *)texturepath.c_str() );
1727
1728         ship_sel = new ssgSelector;
1729
1730         char c;
1731         while ( ! in.eof() ) {
1732             in >> ::skipws;
1733             if ( in.get( c ) && c == '#' ) {
1734                 in >> skipeol;
1735             } else {
1736                 in.putback(c);
1737                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1738                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1739                    int chj=getchar();*/
1740
1741                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1742                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1743
1744                 ship_pos[objc] = new ssgTransform;
1745
1746                 // type "repeat" in objects.txt to load one more
1747                 // instance of the last object.
1748
1749                 if ( strcmp(obj_filename,"repeat") != 0) {
1750                     ship_obj =
1751                         globals->get_model_loader()->load_model( obj_filename );
1752                 }
1753
1754                 if ( ship_obj != NULL ) {
1755                                         ship_obj->setName(obj_filename);
1756                                 if (objc == 0)
1757                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1758                                         else
1759                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1760                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1761                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1762                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1763                             << obj_filename );
1764                 } else {
1765                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1766                             << obj_filename );
1767                 }
1768
1769                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1770                                 //const char *extn = file_extension ( obj_filename ) ;
1771                                 if ( objc == 1 ){
1772                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1773                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1774                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1775                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1776                                         int ltype[500], light_type;
1777                                         static int ltcount = 0;
1778                                     string token;
1779                                         sgVec3 rway_dir,rway_normal,lightpt;
1780                                         Point3D node;
1781                                         modelpath.append(obj_filename);
1782                                         sg_gzifstream in1( modelpath.str() );
1783                                         if ( ! in1.is_open() ) {
1784                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1785                                         } else {
1786                                                 while ( ! in1.eof() ) {
1787                                                         in1 >> ::skipws;
1788                                                         if ( in1.get( c ) && c == '#' ) {
1789                                                                 in1 >> skipeol;
1790                                                         } else {
1791                                                                 in1.putback(c);
1792                                                                 in1 >> token;
1793                                                                 //cout << token << endl;
1794                                                                 if ( token == "runway" ) {
1795                                                                         in1 >> node;
1796                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1797                                                                 } else if ( token == "edgelight" ) {
1798                                                                         in1 >> node;
1799                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1800                                                                         light_type = 1;
1801                                                                 } else if ( token == "taxi" ) {
1802                                                                         in1 >> node;
1803                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1804                                                                         light_type = 2;
1805                                                                 } else if ( token == "vasi" ) {
1806                                                                         in1 >> node;
1807                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1808                                                                         light_type = 3;
1809                                                                 } else if ( token == "threshold" ) {
1810                                                                         in1 >> node;
1811                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1812                                                                         light_type = 4;
1813                                                                 } else if ( token == "rabbit" ) {
1814                                                                         in1 >> node;
1815                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1816                                                                         light_type = 5;
1817                                                                 } else if ( token == "ols" ) {
1818                                                                         in1 >> node;
1819                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1820                                                                         light_type = 6;
1821                                                                 } else if ( token == "red" ) {
1822                                                                         in1 >> node;
1823                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1824                                                                         light_type = 7;
1825                                                                 } else if ( token == "green" ) {
1826                                                                         in1 >> node;
1827                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1828                                                                         light_type = 8;
1829                                                                 } else if ( token == "lp" ) {
1830                                                                         in1 >> node;
1831                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1832                                                                         lightpoints->add( lightpt );
1833                                                                         lightnormals->add( rway_normal );
1834                                                                         lightdir->add( rway_dir );
1835                                                                         ltype[ltcount]= light_type;
1836                                                                         ltcount++;
1837                                                                 }
1838                                                                 if (in1.eof()) break;
1839                                                         }
1840                                                 }  //while
1841
1842                                                 if ( lightpoints->getNum() ) {
1843                                                         ssgBranch *lightpoints_branch;
1844                                                         long int dummy = -999;
1845                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1846                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1847                                                         dummy_tile->ols_transform = new ssgTransform;
1848
1849                                                         // call function to generate the runway lights
1850                                                         lightpoints_branch =
1851                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1852                                                                                                                                 lightdir, ltype);
1853                                                         lightpoints_brightness->addKid(lightpoints_branch);
1854                                                         lightpoints_transform->addKid(lightpoints_brightness);
1855                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1856                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1857                                                         lightpoints_transform->ref();
1858                                                         globals->get_scenery()->get_gnd_lights_branch()->addKid( lightpoints_transform );
1859                                                 }
1860                                         } //if in1
1861                 } //if objc
1862                                 // end hack for deck lights
1863
1864                 objc++;
1865
1866                 if (in.eof()) break;
1867             }
1868         } // while
1869
1870         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
1871
1872         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
1873     }
1874
1875     return;
1876  }
1877
1878
1879 void fgUpdateDCS (void) {
1880
1881     // double eye_lat,eye_lon,eye_alt;
1882     // static double obj_head;
1883     double sl_radius,obj_latgc;
1884     // float nresultmat[4][4];
1885     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
1886     double bz[3];
1887
1888     // Instantaneous Geodetic Lat/Lon/Alt of moving object
1889     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
1890
1891     // Deck should be the first object in objects.txt in case of fdm=ada
1892
1893     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
1894                 if ((fdm->get_iaux(1))==1)
1895                 {
1896                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
1897                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
1898                         obj_alt[1] = fdm->get_daux(3);
1899                         obj_pitch[1] = fdm->get_faux(1);
1900                         obj_roll[1] = fdm->get_faux(2);
1901                 }
1902     }
1903
1904     for ( int m = 0; m < objc; m++ ) {
1905         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
1906         //int v=getchar();
1907
1908         //Geodetic to Geocentric angles for rotation
1909         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
1910
1911         //moving object gbs-posn in cartesian coords
1912         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
1913         Point3D obj_pos = sgGeodToCart( obj_posn );
1914
1915         // Translate moving object w.r.t eye
1916         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
1917         bz[0]=Objtrans.x();
1918         bz[1]=Objtrans.y();
1919         bz[2]=Objtrans.z();
1920
1921        // rotate dynamic objects for lat,lon & alt and other motion about its axes
1922
1923         sgMat4 sgTRANS;
1924         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
1925
1926         sgVec3 ship_fwd,ship_rt,ship_up;
1927         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
1928         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
1929         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
1930
1931         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
1932         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
1933         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
1934         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
1935         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
1936         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
1937
1938         sgMat4 sgTUX;
1939         sgCopyMat4( sgTUX, sgROT_hdg );
1940         sgPostMultMat4( sgTUX, sgROT_pitch );
1941         sgPostMultMat4( sgTUX, sgROT_roll );
1942         sgPostMultMat4( sgTUX, sgROT_lat );
1943         sgPostMultMat4( sgTUX, sgROT_lon );
1944         sgPostMultMat4( sgTUX, sgTRANS );
1945
1946         sgCoord shippos;
1947         sgSetCoord(&shippos, sgTUX );
1948         ship_pos[m]->setTransform( &shippos );
1949         // temporary hack for deck lights - ultimately should move to PLib (when ??)
1950         if (m == 1) {
1951                 if (lightpoints_transform) {
1952                         lightpoints_transform->setTransform( &shippos );
1953                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
1954                         if ( sun_angle > 89 ) {
1955                                 lightpoints_brightness->select(0x01);
1956                         } else {
1957                                 lightpoints_brightness->select(0x00);
1958                         }
1959                 }
1960
1961                 float elev;
1962                 sgVec3 rp,to;
1963                 float *vp;
1964                 float alt;
1965                 float ref_elev;
1966                 sgXformPnt3( rp, rway_ols, sgTUX );
1967                 vp = globals->get_current_view()->get_view_pos();
1968             to[0] = rp[0]-vp[0];
1969             to[1] = rp[1]-vp[1];
1970             to[2] = rp[2]-vp[2];
1971                 float dist = sgLengthVec3( to );
1972                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
1973
1974                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
1975
1976             ref_elev = elev - 3.75; // +ve above, -ve below
1977
1978                 unsigned int sel;
1979                 sel = 0xFF;
1980 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1981 //              if (ref_elev > 0.51) sel = 0x21;
1982 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
1983 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
1984 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
1985 //              if (ref_elev < -0.51) sel = 0x30;
1986 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1987                 dummy_tile->lightmaps_sequence->select(sel);
1988
1989                 sgVec3 up;
1990                 sgCopyVec3 (up, ship_up);
1991                 if (dist > 750)
1992                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
1993                 else
1994                         sgScaleVec3 (up, 4.0*ref_elev);
1995                 dummy_tile->ols_transform->setTransform(up);
1996                 //cout << "ref_elev  " << ref_elev << endl;
1997         }
1998     // end hack for deck lights
1999
2000     }
2001     if ( ship_sel != NULL ) {
2002         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2003     }
2004 }
2005
2006 // $$$ end - added VS Renganathan, 15 Oct 2K
2007 //           added Venky         , 12 Nov 2K