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/ssg.h>
  76
  77 #include <simgear/constants.h>  // for VERSION
  78 #include <simgear/debug/logstream.hxx>
  79 #include <simgear/math/polar3d.hxx>
  80 #include <simgear/math/sg_random.h>
  81 #include <simgear/misc/sg_path.hxx>
  82 #include <simgear/sky/sky.hxx>
  83 #include <simgear/timing/sg_time.hxx>
  84
  85 #include <Include/general.hxx>
  86
  87 #include <Aircraft/aircraft.hxx>
  88
  89 #include <ATC/ATCmgr.hxx>
  90 #include <ATC/ATCdisplay.hxx>
  91 #include <ATC/AIMgr.hxx>
  92
  93 #include <Autopilot/newauto.hxx>
  94
  95 #include <Cockpit/cockpit.hxx>
  96 #include <Cockpit/radiostack.hxx>
  97 #include <Cockpit/steam.hxx>
  98
  99 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 100 #include <GUI/gui.h>
 101 #include <Model/acmodel.hxx>
 102 #include <Model/modelmgr.hxx>
 103 #include <Model/model.hxx>
 104 #include <Main/location.hxx>
 105 #ifdef FG_NETWORK_OLK
 106 #include <NetworkOLK/network.h>
 107 #endif
 108 #include <Objects/matlib.hxx>
 109 #include <Scenery/scenery.hxx>
 110 #include <Scenery/tilemgr.hxx>
 111 #ifdef ENABLE_AUDIO_SUPPORT
 112 #  include <Sound/soundmgr.hxx>
 113 #  include <Sound/fg_fx.hxx>
 114 #  include <Sound/morse.hxx>
 115 #endif
 116 #include <Time/FGEventMgr.hxx>
 117 #include <Time/fg_timer.hxx>
 118 #include <Time/light.hxx>
 119 #include <Time/sunpos.hxx>
 120 #include <Time/tmp.hxx>
 121
 122 #include <Input/input.hxx>
 123
 124 // ADA
 125 #include <simgear/misc/sgstream.hxx>
 126 #include <simgear/math/point3d.hxx>
 127 #include <FDM/flight.hxx>
 128 #include <FDM/ADA.hxx>
 129 #include <Scenery/tileentry.hxx>
 130
 131 #if !defined(sgi)
 132 // PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 133 // PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 134 #endif
 135 float default_attenuation[3] = {1.0, 0.0, 0.0};
 136 //Required for using GL_extensions
 137 void fgLoadDCS (void);
 138 void fgUpdateDCS (void);
 139 ssgSelector *ship_sel=NULL;
 140 // upto 32 instances of a same object can be loaded.
 141 ssgTransform *ship_pos[32];
 142 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 143 int objc=0;
 144 ssgSelector *lightpoints_brightness = new ssgSelector;
 145 ssgTransform *lightpoints_transform = new ssgTransform;
 146 FGTileEntry *dummy_tile;
 147 sgVec3 rway_ols;
 148 // ADA
 149 // Clip plane settings...
 150 float scene_nearplane = 0.5f;
 151 float scene_farplane = 120000.0f;
 152
 153 static double delta_time_sec = 0;
 154
 155
 156 #ifdef FG_WEATHERCM
 157 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 158 #else
 159 #  include <Environment/environment_mgr.hxx>
 160 #endif
 161
 162 #include "version.h"
 163
 164 #include "fg_init.hxx"
 165 #include "fg_io.hxx"
 166 #include "fg_props.hxx"
 167 #include "globals.hxx"
 168 #include "splash.hxx"
 169 #include "viewmgr.hxx"
 170 #include "options.hxx"
 171 #include "logger.hxx"
 172
 173 #ifdef macintosh
 174 #  include <console.h>          // -dw- for command line dialog
 175 #endif
 176
 177
 178 FGEventMgr global_events;
 179
 180 // This is a record containing a bit of global housekeeping information
 181 FGGeneral general;
 182
 183 // Specify our current idle function state.  This is used to run all
 184 // our initializations out of the glutIdleLoop() so that we can get a
 185 // splash screen up and running right away.
 186 static int idle_state = 0;
 187 static long global_multi_loop;
 188
 189 // forward declaration
 190 void fgReshape( int width, int height );
 191
 192 // fog constants.  I'm a little nervous about putting actual code out
 193 // here but it seems to work (?)
 194 static const double m_log01 = -log( 0.01 );
 195 static const double sqrt_m_log01 = sqrt( m_log01 );
 196 static GLfloat fog_exp_density;
 197 static GLfloat fog_exp2_density;
 198 static GLfloat fog_exp2_punch_through;
 199
 200 #ifdef FG_NETWORK_OLK
 201 ssgSelector *fgd_sel = NULL;
 202 ssgTransform *fgd_pos = NULL;
 203 #endif
 204
 205 // current fdm/position used for view
 206 FGInterface cur_view_fdm;
 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 traversal
 651         // of the scene graph without drawing anything and with frustum
 652         // culling disabled.  This ensures that out-of-range random
 653         // objects that are not in the current view frustum will still be
 654         // freed properly.
 655         static int counter = 0;
 656         if (++counter == 200) {
 657                                 // We disable frustrum testing, so
 658                                 // the default is fine.
 659           sgFrustum f;
 660           sgMat4 m;
 661           ssgGetModelviewMatrix(m);
 662           globals->get_scenery()->get_scene_graph()->cull(&f, m, false);
 663           counter = 0;
 664         }
 665
 666         // change state for lighting here
 667
 668         // draw lighting
 669         // Set punch through fog density
 670         glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 671
 672 #ifdef FG_EXPERIMENTAL_LIGHTING
 673         // Enable states for drawing points with GL_extension
 674         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 675             glEnable(GL_POINT_SMOOTH);
 676             float quadratic[3] = {1.0, 0.01, 0.0001};
 677             // get the address of our OpenGL extensions
 678 #if !defined(sgi)
 679             glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
 680                 wglGetProcAddress("glPointParameterfEXT");
 681             glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
 682                 wglGetProcAddress("glPointParameterfvEXT");
 683 #endif
 684             // makes the points fade as they move away
 685             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 686             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 687             glPointSize(4.0);
 688
 689             // Enable states for drawing runway lights with spherical mapping
 690             glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 691             glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 692             glEnable(GL_TEXTURE_GEN_S);
 693             glEnable(GL_TEXTURE_GEN_T);
 694
 695             //Maybe this is not the best way, but it works !!
 696             glPolygonMode(GL_FRONT, GL_POINT);
 697             glCullFace(GL_BACK);
 698             glEnable(GL_CULL_FACE);
 699         }
 700
 701         glDisable( GL_LIGHTING );
 702         // blending function for runway lights
 703         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 704         glEnable(GL_BLEND);
 705 #endif
 706
 707         ssgSetNearFar( scene_nearplane, scene_farplane );
 708         ssgCullAndDraw( globals->get_scenery()->get_lighting() );
 709
 710
 711 #ifdef FG_EXPERIMENTAL_LIGHTING
 712         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 713             // Disable states used for runway lighting
 714             glPolygonMode(GL_FRONT, GL_FILL);
 715
 716             glDisable(GL_TEXTURE_GEN_S);
 717             glDisable(GL_TEXTURE_GEN_T);
 718             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 719                                   default_attenuation);
 720         }
 721
 722         glPointSize(1.0);
 723 #endif
 724
 725         if ( fgGetBool("/sim/rendering/skyblend") ) {
 726             // draw the sky cloud layers
 727           if (fgGetBool("/environment/clouds/status"))
 728             thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 729         }
 730
 731         globals->get_model_mgr()->draw();
 732         globals->get_aircraft_model()->draw();
 733
 734         // display HUD && Panel
 735         glDisable( GL_FOG );
 736         glDisable( GL_DEPTH_TEST );
 737         // glDisable( GL_CULL_FACE );
 738         // glDisable( GL_TEXTURE_2D );
 739
 740         // update the input subsystem
 741         current_input.update(delta_time_sec);
 742
 743         // update the controls subsystem
 744         globals->get_controls()->update(delta_time_sec);
 745
 746         hud_and_panel->apply();
 747         fgCockpitUpdate();
 748
 749         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 750         // This only works properly if called before the panel call
 751         globals->get_ATC_display()->update(delta_time_sec);
 752
 753         // update the panel subsystem
 754         if ( current_panel != NULL ) {
 755             current_panel->update(delta_time_sec);
 756         }
 757
 758         // We can do translucent menus, so why not. :-)
 759         menus->apply();
 760         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 761         puDisplay();
 762         // glDisable ( GL_BLEND ) ;
 763
 764         // glEnable( GL_FOG );
 765
 766         globals->get_logger()->update(delta_time_sec);
 767     }
 768
 769     glutSwapBuffers();
 770 }
 771
 772
 773 // Update internal time dependent calculations (i.e. flight model)
 774 // FIXME: this distinction is obsolete; all subsystems now get delta
 775 // time on update.
 776 void fgUpdateTimeDepCalcs() {
 777     static bool inited = false;
 778
 779     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 780
 781     fgLIGHT *l = &cur_light_params;
 782     int i;
 783
 784     long multi_loop = 1;
 785
 786     // Initialize the FDM here if it hasn't been and if we have a
 787     // scenery elevation hit.
 788
 789     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 790     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 791
 792     if ( !cur_fdm_state->get_inited() &&
 793          globals->get_scenery()->get_cur_elev() > -9990 )
 794     {
 795         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 796
 797         cur_fdm_state->init();
 798         if ( cur_fdm_state->get_bound() ) {
 799             cur_fdm_state->unbind();
 800         }
 801         cur_fdm_state->bind();
 802     }
 803
 804     // conceptually, the following block could be done for each fdm
 805     // instance ...
 806     if ( !cur_fdm_state->get_inited() ) {
 807         // do nothing, fdm isn't inited yet
 808     } else {
 809         // we have been inited, and  we are good to go ...
 810
 811         if ( !inited ) {
 812             inited = true;
 813         }
 814
 815         globals->get_autopilot()->update(delta_time_sec);
 816         cur_fdm_state->update(delta_time_sec);
 817         globals->get_steam()->update(delta_time_sec);
 818     }
 819
 820     if ( !strcmp(fgGetString("/sim/view-mode"), "pilot") ) {
 821         cur_view_fdm = *cur_fdm_state;
 822         // do nothing
 823     }
 824
 825     globals->get_model_mgr()->update(delta_time_sec);
 826     globals->get_aircraft_model()->update(delta_time_sec);
 827
 828     // update the view angle
 829     globals->get_viewmgr()->update(delta_time_sec);
 830
 831     l->UpdateAdjFog();
 832
 833     // Update solar system
 834     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 835                                   globals->get_time_params()->getLst(),
 836                                   cur_fdm_state->get_Latitude() );
 837
 838     // Update radio stack model
 839     current_radiostack->update(delta_time_sec);
 840 }
 841
 842
 843 void fgInitTimeDepCalcs( void ) {
 844     // noop for now
 845 }
 846
 847
 848 static const double alt_adjust_ft = 3.758099;
 849 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 850
 851
 852 // What should we do when we have nothing else to do?  Let's get ready
 853 // for the next move and update the display?
 854 static void fgMainLoop( void ) {
 855
 856     // Update the elapsed time.
 857     current_time_stamp.stamp();
 858     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 859     last_time_stamp = current_time_stamp;
 860     globals->inc_sim_time_sec( delta_time_sec );
 861
 862     static const SGPropertyNode *longitude
 863         = fgGetNode("/position/longitude-deg");
 864     static const SGPropertyNode *latitude
 865         = fgGetNode("/position/latitude-deg");
 866     static const SGPropertyNode *altitude
 867         = fgGetNode("/position/altitude-ft");
 868     static const SGPropertyNode *clock_freeze
 869         = fgGetNode("/sim/freeze/clock", true);
 870     static const SGPropertyNode *cur_time_override
 871         = fgGetNode("/sim/time/cur-time-override", true);
 872
 873     static long remainder = 0;
 874     long elapsed;
 875 #ifdef FANCY_FRAME_COUNTER
 876     int i;
 877     double accum;
 878 #else
 879     static time_t last_time = 0;
 880     static int frames = 0;
 881 #endif // FANCY_FRAME_COUNTER
 882
 883     SGTime *t = globals->get_time_params();
 884
 885     FGLocation * acmodel_location = 0;
 886     if(cur_fdm_state->getACModel() != 0) {
 887       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
 888     }
 889
 890     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 891     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 892
 893 #ifdef FG_NETWORK_OLK
 894     if ( fgGetBool("/sim/networking/network-olk") ) {
 895         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
 896             // printf("FGD: Netupdate\n");
 897             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
 898             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
 899         }
 900     }
 901 #endif
 902
 903 #if defined( ENABLE_PLIB_JOYSTICK )
 904     // Read joystick and update control settings
 905     // if ( fgGetString("/sim/control-mode") == "joystick" )
 906     // {
 907     //    fgJoystickRead();
 908     // }
 909 #elif defined( ENABLE_GLUT_JOYSTICK )
 910     // Glut joystick support works by feeding a joystick handler
 911     // function to glut.  This is taken care of once in the joystick
 912     // init routine and we don't have to worry about it again.
 913 #endif
 914
 915 #ifndef FG_WEATHERCM
 916     globals->get_environment_mgr()->update(delta_time_sec);
 917 #endif
 918
 919     // Fix elevation.  I'm just sticking this here for now, it should
 920     // probably move eventually
 921
 922     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
 923            scenery.get_cur_elev(),
 924            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 925            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 926
 927 // Curt is this code used?  I don't see any problems when I comment it out.
 928     if ( acmodel_location != 0 ) {
 929       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
 930         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
 931              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
 932             // now set aircraft altitude above ground
 933             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
 934                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 935                    acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
 936                    acmodel_location->get_cur_elev_m() + alt_adjust_m );
 937             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
 938                                                 + alt_adjust_m) * SG_METER_TO_FEET );
 939             SG_LOG( SG_ALL, SG_DEBUG,
 940                     "<*> resetting altitude to "
 941                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
 942                     << " meters" );
 943         }
 944       }
 945     }
 946 // End of code in question. (see Curt is this code used? above)
 947
 948     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
 949            scenery.get_cur_elev(),
 950            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 951            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 952
 953     // cout << "Warp = " << globals->get_warp() << endl;
 954
 955     // update "time"
 956     static bool last_clock_freeze = false;
 957
 958     if ( clock_freeze->getBoolValue() ) {
 959         // clock freeze requested
 960         if ( cur_time_override->getLongValue() == 0 ) {
 961             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
 962             globals->set_warp( 0 );
 963         }
 964     } else {
 965         // no clock freeze requested
 966         if ( last_clock_freeze == true ) {
 967             // clock just unfroze, let's set warp as the difference
 968             // between frozen time and current time so we don't get a
 969             // time jump (and corresponding sky object and lighting
 970             // jump.)
 971             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
 972             fgSetLong( "/sim/time/cur-time-override", 0 );
 973         }
 974         if ( globals->get_warp_delta() != 0 ) {
 975             globals->inc_warp( globals->get_warp_delta() );
 976         }
 977     }
 978
 979     last_clock_freeze = clock_freeze->getBoolValue();
 980
 981     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 982                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 983                cur_time_override->getLongValue(),
 984                globals->get_warp() );
 985
 986     if ( globals->get_warp_delta() != 0 ) {
 987         fgUpdateSkyAndLightingParams();
 988     }
 989
 990     // update magvar model
 991     globals->get_mag()->update( longitude->getDoubleValue()
 992                                   * SGD_DEGREES_TO_RADIANS,
 993                                 latitude->getDoubleValue()
 994                                   * SGD_DEGREES_TO_RADIANS,
 995                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
 996                                 globals->get_time_params()->getJD() );
 997
 998     // Get elapsed time (in usec) for this past frame
 999     elapsed = fgGetTimeInterval();
1000     SG_LOG( SG_ALL, SG_DEBUG,
1001             "Elapsed time interval is = " << elapsed
1002             << ", previous remainder is = " << remainder );
1003
1004     // Calculate frame rate average
1005 #ifdef FANCY_FRAME_COUNTER
1006     /* old fps calculation */
1007     if ( elapsed > 0 ) {
1008         double tmp;
1009         accum = 0.0;
1010         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1011             tmp = general.get_frame(i);
1012             accum += tmp;
1013             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1014             general.set_frame(i+1,tmp);
1015         }
1016         tmp = 1000000.0 / (float)elapsed;
1017         general.set_frame(0,tmp);
1018         // printf("frame[0] = %.2f\n", general.frames[0]);
1019         accum += tmp;
1020         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1021         // printf("ave = %.2f\n", general.frame_rate);
1022     }
1023 #else
1024     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1025         general.set_frame_rate( frames );
1026         SG_LOG( SG_ALL, SG_DEBUG,
1027                 "--> Frame rate is = " << general.get_frame_rate() );
1028         frames = 0;
1029     }
1030     last_time = t->get_cur_time();
1031     ++frames;
1032 #endif
1033
1034     // Run ATC subsystem
1035     globals->get_ATC_mgr()->update(delta_time_sec);
1036
1037     // Run the AI subsystem
1038     // globals->get_AI_mgr()->update(delta_time_sec);
1039
1040     // Run flight model
1041
1042     // Calculate model iterations needed for next frame
1043     elapsed += remainder;
1044
1045     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1046                               fgGetInt("/sim/model-hz"));
1047     remainder = elapsed - ( (global_multi_loop*1000000) /
1048                             fgGetInt("/sim/model-hz") );
1049     SG_LOG( SG_ALL, SG_DEBUG,
1050             "Model iterations needed = " << global_multi_loop
1051             << ", new remainder = " << remainder );
1052
1053     // chop max interations to something reasonable if the sim was
1054     // delayed for an excesive amount of time
1055     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1056         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1057         remainder = 0;
1058     }
1059
1060     // flight model
1061     if ( global_multi_loop > 0 ) {
1062         fgUpdateTimeDepCalcs();
1063     } else {
1064         SG_LOG( SG_ALL, SG_DEBUG,
1065                 "Elapsed time is zero ... we're zinging" );
1066     }
1067
1068 #if ! defined( macintosh )
1069     // Do any I/O channel work that might need to be done
1070     fgIOProcess();
1071 #endif
1072
1073     // see if we need to load any deferred-load textures
1074     material_lib.load_next_deferred();
1075
1076     // Run audio scheduler
1077 #ifdef ENABLE_AUDIO_SUPPORT
1078     if ( fgGetBool("/sim/sound/audible")
1079            && globals->get_soundmgr()->is_working() ) {
1080         globals->get_fx()->update(1); // FIXME: use dt
1081         globals->get_soundmgr()->update(1); // FIXME: use dt
1082     }
1083 #endif
1084
1085     //
1086     // Tile Manager updates - see if we need to load any new scenery tiles.
1087     //   this code ties together the fdm, viewer and scenery classes...
1088     //   we may want to move this to it's own class at some point
1089     //
1090     double visibility_meters = fgGetDouble("/environment/visibility-m");
1091     FGViewer *current_view = globals->get_current_view();
1092
1093     // update tile manager for FDM...
1094     // ...only if location is different than the viewer (to avoid duplicating effort)
1095     if( acmodel_location != current_view->getFGLocation() ) {
1096       if( acmodel_location != 0 ) {
1097         global_tile_mgr.prep_ssg_nodes(visibility_meters,
1098                acmodel_location->get_world_up(),
1099                acmodel_location->get_tile_center());
1100         global_tile_mgr.update( acmodel_location->getLongitude_deg(),
1101                             acmodel_location->getLatitude_deg(),
1102                             visibility_meters,
1103                             acmodel_location->get_absolute_view_pos(),
1104                             acmodel_location->get_current_bucket(),
1105                             acmodel_location->get_previous_bucket(),
1106                             acmodel_location->get_tile_center()
1107                             );
1108         // save results of update in FGLocation for fdm...
1109         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1110           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1111         }
1112         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1113         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1114         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1115       }
1116     }
1117
1118     global_tile_mgr.prep_ssg_nodes(visibility_meters,
1119        current_view->getFGLocation()->get_world_up(),
1120        current_view->getFGLocation()->get_tile_center());
1121     // update tile manager for view...
1122     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1123     // after the FDM's until all of Flight Gear code references the viewer's location
1124     // for elevation instead of the "scenery's" current elevation.
1125     global_tile_mgr.update( current_view->getLongitude_deg(),
1126                             current_view->getLatitude_deg(),
1127                             visibility_meters,
1128                             current_view->get_absolute_view_pos(),
1129                             current_view->getFGLocation()->get_current_bucket(),
1130                             current_view->getFGLocation()->get_previous_bucket(),
1131                             current_view->getFGLocation()->get_tile_center()
1132                             );
1133     // save results of update in FGLocation for fdm...
1134     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1135       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1136     }
1137     current_view->getFGLocation()->set_current_bucket( global_tile_mgr.get_current_bucket() );
1138     current_view->getFGLocation()->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1139     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1140
1141     // If fdm location is same as viewer's then we didn't do the update for fdm location
1142     //   above so we need to save the viewer results in the fdm FGLocation as well...
1143     if( acmodel_location == current_view->getFGLocation() ) {
1144       if( acmodel_location != 0 ) {
1145         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1146           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1147         }
1148         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1149         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1150         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1151       }
1152     }
1153
1154     // END Tile Manager udpates
1155
1156     // redraw display
1157     fgRenderFrame();
1158
1159     SG_LOG( SG_ALL, SG_DEBUG, "" );
1160 }
1161
1162
1163 // This is the top level master main function that is registered as
1164 // our idle funciton
1165
1166 // The first few passes take care of initialization things (a couple
1167 // per pass) and once everything has been initialized fgMainLoop from
1168 // then on.
1169
1170 static void fgIdleFunction ( void ) {
1171     // printf("idle state == %d\n", idle_state);
1172
1173     if ( idle_state == 0 ) {
1174         // Initialize the splash screen right away
1175         if ( fgGetBool("/sim/startup/splash-screen") ) {
1176             fgSplashInit();
1177         }
1178
1179         idle_state++;
1180     } else if ( idle_state == 1 ) {
1181         // Initialize audio support
1182 #ifdef ENABLE_AUDIO_SUPPORT
1183
1184         // Start the intro music
1185         if ( fgGetBool("/sim/startup/intro-music") ) {
1186             SGPath mp3file( globals->get_fg_root() );
1187             mp3file.append( "Sounds/intro.mp3" );
1188
1189             SG_LOG( SG_GENERAL, SG_INFO,
1190                     "Starting intro music: " << mp3file.str() );
1191
1192 #if defined( __CYGWIN__ )
1193             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1194 #elif defined( WIN32 )
1195             string command = "start /m " + mp3file.str();
1196 #else
1197             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1198 #endif
1199
1200             system ( command.c_str() );
1201         }
1202 #endif
1203
1204         idle_state++;
1205     } else if ( idle_state == 2 ) {
1206         // These are a few miscellaneous things that aren't really
1207         // "subsystems" but still need to be initialized.
1208
1209 #ifdef USE_GLIDE
1210         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1211             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1212         }
1213 #endif
1214
1215         idle_state++;
1216     } else if ( idle_state == 3 ) {
1217         // This is the top level init routine which calls all the
1218         // other subsystem initialization routines.  If you are adding
1219         // a subsystem to flightgear, its initialization call should
1220         // located in this routine.
1221         if( !fgInitSubsystems()) {
1222             SG_LOG( SG_GENERAL, SG_ALERT,
1223                     "Subsystem initializations failed ..." );
1224             exit(-1);
1225         }
1226
1227         idle_state++;
1228     } else if ( idle_state == 4 ) {
1229         // setup OpenGL view parameters
1230         fgInitVisuals();
1231
1232         idle_state++;
1233     } else if ( idle_state == 5 ) {
1234
1235         idle_state++;
1236     } else if ( idle_state == 6 ) {
1237         // sleep(1);
1238         idle_state = 1000;
1239
1240         cout << "Panel visible = " << fgPanelVisible() << endl;
1241         fgReshape( fgGetInt("/sim/startup/xsize"),
1242                    fgGetInt("/sim/startup/ysize") );
1243     }
1244
1245     if ( idle_state == 1000 ) {
1246         // We've finished all our initialization steps, from now on we
1247         // run the main loop.
1248
1249         glutIdleFunc(fgMainLoop);
1250     } else {
1251         if ( fgGetBool("/sim/startup/splash-screen") ) {
1252             fgSplashUpdate(0.0);
1253         }
1254     }
1255 }
1256
1257 // options.cxx needs to see this for toggle_panel()
1258 // Handle new window size or exposure
1259 void fgReshape( int width, int height ) {
1260     int view_h;
1261
1262     if ( (!fgGetBool("/sim/virtual-cockpit"))
1263          && fgPanelVisible() && idle_state == 1000 ) {
1264         view_h = (int)(height * (current_panel->getViewHeight() -
1265                                  current_panel->getYOffset()) / 768.0);
1266     } else {
1267         view_h = height;
1268     }
1269
1270     // for all views
1271     FGViewMgr *viewmgr = globals->get_viewmgr();
1272     for ( int i = 0; i < viewmgr->size(); ++i ) {
1273       viewmgr->get_view(i)->
1274         set_aspect_ratio((float)view_h / (float)width);
1275     }
1276
1277     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1278
1279     fgSetInt("/sim/startup/xsize", width);
1280     fgSetInt("/sim/startup/ysize", height);
1281     guiInitMouse(width, height);
1282
1283     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1284                viewmgr->get_current_view()->get_v_fov() );
1285
1286     fgHUDReshape();
1287 }
1288
1289 // Initialize GLUT and define a main window
1290 int fgGlutInit( int *argc, char **argv ) {
1291
1292 #if !defined( macintosh )
1293     // GLUT will extract all glut specific options so later on we only
1294     // need wory about our own.
1295     glutInit(argc, argv);
1296 #endif
1297
1298     // Define Display Parameters
1299     glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1300
1301     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1302             fgGetInt("/sim/startup/xsize") << "x"
1303             << fgGetInt("/sim/startup/ysize") );
1304
1305     // Define initial window size
1306     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1307                         fgGetInt("/sim/startup/ysize") );
1308
1309     // Initialize windows
1310     if ( !fgGetBool("/sim/startup/game-mode")) {
1311         // Open the regular window
1312         glutCreateWindow("FlightGear");
1313 #ifndef GLUT_WRONG_VERSION
1314     } else {
1315         // Open the cool new 'game mode' window
1316         char game_mode_str[256];
1317 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1318 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1319 #ifndef ENUM_CURRENT_SETTINGS
1320 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1321 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1322 #endif
1323
1324         DEVMODE dm;
1325         dm.dmSize = sizeof(DEVMODE);
1326         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1327         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1328         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1329         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1330                                                 fgGetInt("/sim/startup/ysize") );
1331         sprintf( game_mode_str, "%dx%d:%d@%d",
1332                          dm.dmPelsWidth,
1333                          dm.dmPelsHeight,
1334                          dm.dmBitsPerPel,
1335                          dm.dmDisplayFrequency );
1336 #else
1337         // Open the cool new 'game mode' window
1338         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1339                  fgGetInt("/sim/startup/xsize"),
1340                  fgGetInt("/sim/startup/ysize"),
1341                  fgGetInt("/sim/rendering/bits-per-pixel"));
1342
1343 #endif // HAVE_WINDOWS_H
1344         SG_LOG( SG_GENERAL, SG_INFO,
1345                 "game mode params = " << game_mode_str );
1346         glutGameModeString( game_mode_str );
1347         glutEnterGameMode();
1348 #endif // GLUT_WRONG_VERSION
1349     }
1350
1351     // This seems to be the absolute earliest in the init sequence
1352     // that these calls will return valid info.  Too bad it's after
1353     // we've already created and sized out window. :-(
1354     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1355     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1356     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1357     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1358
1359     GLint tmp;
1360     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1361     general.set_glMaxTexSize( tmp );
1362     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1363
1364     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1365     general.set_glDepthBits( tmp );
1366     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1367
1368     return 1;
1369 }
1370
1371
1372 // Initialize GLUT event handlers
1373 int fgGlutInitEvents( void ) {
1374     // call fgReshape() on window resizes
1375     glutReshapeFunc( fgReshape );
1376
1377     // keyboard and mouse callbacks are set in FGInput::init
1378
1379     // call fgMainLoop() whenever there is
1380     // nothing else to do
1381     glutIdleFunc( fgIdleFunction );
1382
1383     // draw the scene
1384     glutDisplayFunc( fgRenderFrame );
1385
1386     return 1;
1387 }
1388
1389
1390 // Main loop
1391 int mainLoop( int argc, char **argv ) {
1392
1393 #if defined( macintosh )
1394     freopen ("stdout.txt", "w", stdout );
1395     freopen ("stderr.txt", "w", stderr );
1396     argc = ccommand( &argv );
1397 #endif
1398
1399     // set default log levels
1400     sglog().setLogLevels( SG_ALL, SG_INFO );
1401
1402     string version;
1403 #ifdef FLIGHTGEAR_VERSION
1404     version = FLIGHTGEAR_VERSION;
1405 #else
1406     version = "unknown version";
1407 #endif
1408     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1409             << version );
1410     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1411
1412     // Allocate global data structures.  This needs to happen before
1413     // we parse command line options
1414
1415     globals = new FGGlobals;
1416
1417 #ifndef FG_WEATHERCM
1418     globals->set_environment_mgr(new FGEnvironmentMgr);
1419 #endif
1420
1421     // seed the random number generater
1422     sg_srandom_time();
1423
1424     SGRoute *route = new SGRoute;
1425     globals->set_route( route );
1426
1427     FGControls *controls = new FGControls;
1428     globals->set_controls( controls );
1429
1430     FGSteam *steam = new FGSteam;
1431     globals->set_steam( steam );
1432
1433     string_list *col = new string_list;
1434     globals->set_channel_options_list( col );
1435
1436     // Scan the config file(s) and command line options to see if
1437     // fg_root was specified (ignore all other options for now)
1438     fgInitFGRoot(argc, argv);
1439
1440     // Check for the correct base package version
1441     static char required_version[] = "0.7.11pre1";
1442     string base_version = fgBasePackageVersion();
1443     if ( !(base_version == required_version) ) {
1444         // tell the operator how to use this application
1445         fgUsage();
1446
1447         SG_LOG( SG_GENERAL, SG_ALERT, "Base package check failed ... "
1448                 << "Found version " << base_version << " at: "
1449                 << globals->get_fg_root() );
1450         SG_LOG( SG_GENERAL, SG_ALERT, "Please upgrade to version"
1451                 << required_version);
1452         exit(-1);
1453     }
1454
1455     // Initialize the Aircraft directory to "" (UIUC)
1456     aircraft_dir = "";
1457
1458     // Load the configuration parameters
1459     if ( !fgInitConfig(argc, argv) ) {
1460         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1461         exit(-1);
1462     }
1463
1464     // Initialize the Window/Graphics environment.
1465     if( !fgGlutInit(&argc, argv) ) {
1466         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1467         exit(-1);
1468     }
1469
1470     // Initialize the various GLUT Event Handlers.
1471     if( !fgGlutInitEvents() ) {
1472         SG_LOG( SG_GENERAL, SG_ALERT,
1473                 "GLUT event handler initialization failed ..." );
1474         exit(-1);
1475     }
1476
1477     // Initialize plib net interface
1478     netInit( &argc, argv );
1479
1480     // Initialize ssg (from plib).  Needs to come before we do any
1481     // other ssg stuff, but after opengl/glut has been initialized.
1482     ssgInit();
1483
1484     // Initialize the user interface (we need to do this before
1485     // passing off control to glut and before fgInitGeneral to get our
1486     // fonts !!!
1487     guiInit();
1488
1489 #ifdef GL_EXT_texture_lod_bias
1490     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1491 #endif
1492
1493     // Set position relative to glide slope if requested
1494     fgSetPosFromGlideSlope();
1495
1496     // If we have an explicit, in-range lon/lat, use it.
1497     // If not, check for an airport-id and use that.
1498     // If not, default to the middle of the KSFO field.
1499     // The default values for lon/lat are deliberately out of range
1500     // so that the airport-id can take effect; valid lon/lat will
1501     // override airport-id, however.
1502     double lon_deg = fgGetDouble("/position/longitude-deg");
1503     double lat_deg = fgGetDouble("/position/latitude-deg");
1504     if (lon_deg < -180 || lon_deg > 180 || lat_deg < -90 || lat_deg > 90) {
1505       if ( fgGetString("/sim/startup/airport-id")[0] != '\0' ) {
1506         fgSetPosFromAirportIDandHdg( fgGetString("/sim/startup/airport-id"),
1507                                      fgGetDouble("/orientation/heading-deg") );
1508         // set tower position (a little off the heading for single
1509         // runway airports)
1510         fgSetTowerPosFromAirportID( fgGetString("/sim/startup/airport-id"),
1511                                     fgGetDouble("orientation/heading") );
1512       } else {
1513                                 // Default to middle of KSFO field
1514         fgSetDouble("/position/longitude-deg", -122.374843);
1515         fgSetDouble("/position/latitude-deg", 37.619002);
1516       }
1517     }
1518
1519     SGTime *t = fgInitTime();
1520     globals->set_time_params( t );
1521
1522     // Do some quick general initializations
1523     if( !fgInitGeneral()) {
1524         SG_LOG( SG_GENERAL, SG_ALERT,
1525                 "General initializations failed ..." );
1526         exit(-1);
1527     }
1528
1529     SGPath modelpath( globals->get_fg_root() );
1530     ssgModelPath( (char *)modelpath.c_str() );
1531
1532     // Initialize the global scenery manager
1533     globals->set_scenery( new FGScenery );
1534     globals->get_scenery()->init();
1535     globals->get_scenery()->bind();
1536
1537     ////////////////////////////////////////////////////////////////////
1538     // Initialize the general model subsystem.
1539     ////////////////////////////////////////////////////////////////////
1540
1541     globals->set_model_mgr(new FGModelMgr);
1542     globals->get_model_mgr()->init();
1543     globals->get_model_mgr()->bind();
1544
1545     ////////////////////////////////////////////////////////////////////
1546     // Initialize the 3D aircraft model subsystem.
1547     ////////////////////////////////////////////////////////////////////
1548
1549     globals->set_aircraft_model(new FGAircraftModel);
1550     globals->get_aircraft_model()->init();
1551     globals->get_aircraft_model()->bind();
1552
1553     ////////////////////////////////////////////////////////////////////
1554     // Initialize the view manager subsystem.
1555     ////////////////////////////////////////////////////////////////////
1556
1557     FGViewMgr *viewmgr = new FGViewMgr;
1558     globals->set_viewmgr( viewmgr );
1559     viewmgr->init();
1560     viewmgr->bind();
1561
1562
1563     // Initialize the sky
1564     SGPath ephem_data_path( globals->get_fg_root() );
1565     ephem_data_path.append( "Astro" );
1566     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1567     ephem->update( globals->get_time_params()->getMjd(),
1568                    globals->get_time_params()->getLst(),
1569                    0.0 );
1570     globals->set_ephem( ephem );
1571
1572                                 // TODO: move to environment mgr
1573     thesky = new SGSky;
1574     SGPath texture_path(globals->get_fg_root());
1575     texture_path.append("Textures");
1576     texture_path.append("Sky");
1577     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1578       SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1579       thesky->add_cloud_layer(layer);
1580     }
1581
1582
1583     SGPath sky_tex_path( globals->get_fg_root() );
1584     sky_tex_path.append( "Textures" );
1585     sky_tex_path.append( "Sky" );
1586     thesky->texture_path( sky_tex_path.str() );
1587
1588     thesky->build( 550.0, 550.0,
1589                    globals->get_ephem()->getNumPlanets(),
1590                    globals->get_ephem()->getPlanets(), 60000.0,
1591                    globals->get_ephem()->getNumStars(),
1592                    globals->get_ephem()->getStars(), 60000.0 );
1593
1594     // Initialize MagVar model
1595     SGMagVar *magvar = new SGMagVar();
1596     globals->set_mag( magvar );
1597
1598     // airport = new ssgBranch;
1599     // airport->setName( "Airport Lighting" );
1600     // lighting->addKid( airport );
1601
1602     // ADA
1603     fgLoadDCS();
1604     // ADA
1605
1606 #ifdef FG_NETWORK_OLK
1607     // Do the network intialization
1608     if ( fgGetBool("/sim/networking/network-olk") ) {
1609         printf("Multipilot mode %s\n",
1610                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1611     }
1612 #endif
1613
1614     // build our custom render states
1615     fgBuildRenderStates();
1616
1617     // pass control off to the master GLUT event handler
1618     glutMainLoop();
1619
1620     // we never actually get here ... but to avoid compiler warnings,
1621     // etc.
1622     return 0;
1623 }
1624
1625
1626 // $$$ end - added VS Renganathan, 15 Oct 2K
1627 //         - added Venky         , 12 Nov 2K
1628
1629 #if defined(__linux__) && defined(__i386__)
1630
1631 static void handleFPE (int);
1632
1633 static void
1634 initFPE ()
1635 {
1636     fpu_control_t fpe_flags = 0;
1637     _FPU_GETCW(fpe_flags);
1638 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1639 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1640 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1641 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1642 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1643 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1644     _FPU_SETCW(fpe_flags);
1645     signal(SIGFPE, handleFPE);
1646 }
1647
1648 static void
1649 handleFPE (int num)
1650 {
1651   initFPE();
1652   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1653 }
1654 #endif
1655
1656 // Main entry point; catch any exceptions that have made it this far.
1657 int main ( int argc, char **argv ) {
1658
1659     // Enable floating-point exceptions for Linux/x86
1660 #if defined(__linux__) && defined(__i386__)
1661     initFPE();
1662 #endif
1663
1664     // Enable floating-point exceptions for Windows
1665 #if defined( _MSC_VER ) && defined( DEBUG )
1666     // Christian, we should document what this does
1667     _control87( _EM_INEXACT, _MCW_EM );
1668 #endif
1669
1670 #if defined( HAVE_BC5PLUS )
1671     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1672 #endif
1673
1674     // FIXME: add other, more specific
1675     // exceptions.
1676     try {
1677         mainLoop(argc, argv);
1678     } catch (sg_throwable &t) {
1679                                 // We must use cerr rather than
1680                                 // logging, since logging may be
1681                                 // disabled.
1682         cerr << "Fatal error: " << t.getFormattedMessage()
1683              << "\n (received from " << t.getOrigin() << ')' << endl;
1684         exit(1);
1685     }
1686
1687     return 0;
1688 }
1689
1690
1691 void fgLoadDCS(void) {
1692
1693     ssgEntity *ship_obj = NULL;
1694
1695     char obj_filename[25];
1696
1697     for ( int k = 0; k < 32; k++ ) {
1698         ship_pos[k]=NULL;
1699     }
1700
1701     SGPath tile_path( globals->get_fg_root());
1702     tile_path.append( "Scenery" );
1703     tile_path.append( "Objects.txt" );
1704     sg_gzifstream in( tile_path.str() );
1705     if ( ! in.is_open() ) {
1706         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1707     } else {
1708
1709         SGPath modelpath( globals->get_fg_root() );
1710         modelpath.append( "Models" );
1711         modelpath.append( "Geometry" );
1712
1713         SGPath texturepath( globals->get_fg_root() );
1714         texturepath.append( "Models" );
1715         texturepath.append( "Textures" );
1716
1717         ssgModelPath( (char *)modelpath.c_str() );
1718         ssgTexturePath( (char *)texturepath.c_str() );
1719
1720         ship_sel = new ssgSelector;
1721
1722         char c;
1723         while ( ! in.eof() ) {
1724             in >> ::skipws;
1725             if ( in.get( c ) && c == '#' ) {
1726                 in >> skipeol;
1727             } else {
1728                 in.putback(c);
1729                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1730                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1731                    int chj=getchar();*/
1732
1733                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1734                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1735
1736                 ship_pos[objc] = new ssgTransform;
1737
1738                 // type "repeat" in objects.txt to load one more
1739                 // instance of the last object.
1740
1741                 if ( strcmp(obj_filename,"repeat") != 0) {
1742                     ship_obj = ssgLoad( obj_filename );
1743                 }
1744
1745                 if ( ship_obj != NULL ) {
1746                                         ship_obj->setName(obj_filename);
1747                                 if (objc == 0)
1748                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1749                                         else
1750                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1751                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1752                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1753                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1754                             << obj_filename );
1755                 } else {
1756                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1757                             << obj_filename );
1758                 }
1759
1760                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1761                                 //const char *extn = file_extension ( obj_filename ) ;
1762                                 if ( objc == 1 ){
1763                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1764                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1765                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1766                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1767                                         int ltype[500], light_type;
1768                                         static int ltcount = 0;
1769                                     string token;
1770                                         sgVec3 rway_dir,rway_normal,lightpt;
1771                                         Point3D node;
1772                                         modelpath.append(obj_filename);
1773                                         sg_gzifstream in1( modelpath.str() );
1774                                         if ( ! in1.is_open() ) {
1775                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1776                                         } else {
1777                                                 while ( ! in1.eof() ) {
1778                                                         in1 >> ::skipws;
1779                                                         if ( in1.get( c ) && c == '#' ) {
1780                                                                 in1 >> skipeol;
1781                                                         } else {
1782                                                                 in1.putback(c);
1783                                                                 in1 >> token;
1784                                                                 //cout << token << endl;
1785                                                                 if ( token == "runway" ) {
1786                                                                         in1 >> node;
1787                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1788                                                                 } else if ( token == "edgelight" ) {
1789                                                                         in1 >> node;
1790                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1791                                                                         light_type = 1;
1792                                                                 } else if ( token == "taxi" ) {
1793                                                                         in1 >> node;
1794                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1795                                                                         light_type = 2;
1796                                                                 } else if ( token == "vasi" ) {
1797                                                                         in1 >> node;
1798                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1799                                                                         light_type = 3;
1800                                                                 } else if ( token == "threshold" ) {
1801                                                                         in1 >> node;
1802                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1803                                                                         light_type = 4;
1804                                                                 } else if ( token == "rabbit" ) {
1805                                                                         in1 >> node;
1806                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1807                                                                         light_type = 5;
1808                                                                 } else if ( token == "ols" ) {
1809                                                                         in1 >> node;
1810                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1811                                                                         light_type = 6;
1812                                                                 } else if ( token == "red" ) {
1813                                                                         in1 >> node;
1814                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1815                                                                         light_type = 7;
1816                                                                 } else if ( token == "green" ) {
1817                                                                         in1 >> node;
1818                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1819                                                                         light_type = 8;
1820                                                                 } else if ( token == "lp" ) {
1821                                                                         in1 >> node;
1822                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1823                                                                         lightpoints->add( lightpt );
1824                                                                         lightnormals->add( rway_normal );
1825                                                                         lightdir->add( rway_dir );
1826                                                                         ltype[ltcount]= light_type;
1827                                                                         ltcount++;
1828                                                                 }
1829                                                                 if (in1.eof()) break;
1830                                                         }
1831                                                 }  //while
1832
1833                                                 if ( lightpoints->getNum() ) {
1834                                                         ssgBranch *lightpoints_branch;
1835                                                         long int dummy = -999;
1836                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1837                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1838                                                         dummy_tile->ols_transform = new ssgTransform;
1839
1840                                                         // call function to generate the runway lights
1841                                                         lightpoints_branch =
1842                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1843                                                                                                                                 lightdir, ltype);
1844                                                         lightpoints_brightness->addKid(lightpoints_branch);
1845                                                         lightpoints_transform->addKid(lightpoints_brightness);
1846                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1847                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1848                                                         lightpoints_transform->ref();
1849                                                         globals->get_scenery()->get_gnd_lights_branch()->addKid( lightpoints_transform );
1850                                                 }
1851                                         } //if in1
1852                 } //if objc
1853                                 // end hack for deck lights
1854
1855                 objc++;
1856
1857                 if (in.eof()) break;
1858             }
1859         } // while
1860
1861         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
1862
1863         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
1864     }
1865
1866     return;
1867  }
1868
1869
1870 void fgUpdateDCS (void) {
1871
1872     // double eye_lat,eye_lon,eye_alt;
1873     // static double obj_head;
1874     double sl_radius,obj_latgc;
1875     // float nresultmat[4][4];
1876     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
1877     double bz[3];
1878
1879     // Instantaneous Geodetic Lat/Lon/Alt of moving object
1880     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
1881
1882     // Deck should be the first object in objects.txt in case of fdm=ada
1883
1884     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
1885                 if ((fdm->get_iaux(1))==1)
1886                 {
1887                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
1888                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
1889                         obj_alt[1] = fdm->get_daux(3);
1890                         obj_pitch[1] = fdm->get_faux(1);
1891                         obj_roll[1] = fdm->get_faux(2);
1892                 }
1893     }
1894
1895     for ( int m = 0; m < objc; m++ ) {
1896         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
1897         //int v=getchar();
1898
1899         //Geodetic to Geocentric angles for rotation
1900         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
1901
1902         //moving object gbs-posn in cartesian coords
1903         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
1904         Point3D obj_pos = sgGeodToCart( obj_posn );
1905
1906         // Translate moving object w.r.t eye
1907         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
1908         bz[0]=Objtrans.x();
1909         bz[1]=Objtrans.y();
1910         bz[2]=Objtrans.z();
1911
1912        // rotate dynamic objects for lat,lon & alt and other motion about its axes
1913
1914         sgMat4 sgTRANS;
1915         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
1916
1917         sgVec3 ship_fwd,ship_rt,ship_up;
1918         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
1919         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
1920         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
1921
1922         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
1923         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
1924         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
1925         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
1926         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
1927         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
1928
1929         sgMat4 sgTUX;
1930         sgCopyMat4( sgTUX, sgROT_hdg );
1931         sgPostMultMat4( sgTUX, sgROT_pitch );
1932         sgPostMultMat4( sgTUX, sgROT_roll );
1933         sgPostMultMat4( sgTUX, sgROT_lat );
1934         sgPostMultMat4( sgTUX, sgROT_lon );
1935         sgPostMultMat4( sgTUX, sgTRANS );
1936
1937         sgCoord shippos;
1938         sgSetCoord(&shippos, sgTUX );
1939         ship_pos[m]->setTransform( &shippos );
1940         // temporary hack for deck lights - ultimately should move to PLib (when ??)
1941         if (m == 1) {
1942                 if (lightpoints_transform) {
1943                         lightpoints_transform->setTransform( &shippos );
1944                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
1945                         if ( sun_angle > 89 ) {
1946                                 lightpoints_brightness->select(0x01);
1947                         } else {
1948                                 lightpoints_brightness->select(0x00);
1949                         }
1950                 }
1951
1952                 float elev;
1953                 sgVec3 rp,to;
1954                 float *vp;
1955                 float alt;
1956                 float ref_elev;
1957                 sgXformPnt3( rp, rway_ols, sgTUX );
1958                 vp = globals->get_current_view()->get_view_pos();
1959             to[0] = rp[0]-vp[0];
1960             to[1] = rp[1]-vp[1];
1961             to[2] = rp[2]-vp[2];
1962                 float dist = sgLengthVec3( to );
1963                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
1964
1965                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
1966
1967             ref_elev = elev - 3.75; // +ve above, -ve below
1968
1969                 unsigned int sel;
1970                 sel = 0xFF;
1971 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1972 //              if (ref_elev > 0.51) sel = 0x21;
1973 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
1974 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
1975 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
1976 //              if (ref_elev < -0.51) sel = 0x30;
1977 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1978                 dummy_tile->lightmaps_sequence->select(sel);
1979
1980                 sgVec3 up;
1981                 sgCopyVec3 (up, ship_up);
1982                 if (dist > 750)
1983                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
1984                 else
1985                         sgScaleVec3 (up, 4.0*ref_elev);
1986                 dummy_tile->ols_transform->setTransform(up);
1987                 //cout << "ref_elev  " << ref_elev << endl;
1988         }
1989     // end hack for deck lights
1990
1991     }
1992     if ( ship_sel != NULL ) {
1993         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
1994     }
1995 }
1996
1997 // $$$ end - added VS Renganathan, 15 Oct 2K
1998 //           added Venky         , 12 Nov 2K