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 #ifdef FG_NETWORK_OLK
 104 #include <NetworkOLK/network.h>
 105 #endif
 106 #include <Objects/matlib.hxx>
 107 #include <Scenery/scenery.hxx>
 108 #include <Scenery/tilemgr.hxx>
 109 #ifdef ENABLE_AUDIO_SUPPORT
 110 #  include <Sound/soundmgr.hxx>
 111 #  include <Sound/fg_fx.hxx>
 112 #  include <Sound/morse.hxx>
 113 #endif
 114 #include <Time/FGEventMgr.hxx>
 115 #include <Time/fg_timer.hxx>
 116 #include <Time/light.hxx>
 117 #include <Time/sunpos.hxx>
 118 #include <Time/tmp.hxx>
 119
 120 #include <Input/input.hxx>
 121
 122 // ADA
 123 #include <simgear/misc/sgstream.hxx>
 124 #include <simgear/math/point3d.hxx>
 125 #include <FDM/flight.hxx>
 126 #include <FDM/ADA.hxx>
 127 #include <Scenery/tileentry.hxx>
 128
 129 #if !defined(sgi)
 130 // PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 131 // PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 132 #endif
 133 float default_attenuation[3] = {1.0, 0.0, 0.0};
 134 //Required for using GL_extensions
 135 void fgLoadDCS (void);
 136 void fgUpdateDCS (void);
 137 ssgSelector *ship_sel=NULL;
 138 // upto 32 instances of a same object can be loaded.
 139 ssgTransform *ship_pos[32];
 140 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 141 int objc=0;
 142 ssgSelector *lightpoints_brightness = new ssgSelector;
 143 ssgTransform *lightpoints_transform = new ssgTransform;
 144 FGTileEntry *dummy_tile;
 145 sgVec3 rway_ols;
 146 // ADA
 147 // Clip plane settings...
 148 float scene_nearplane = 0.5f;
 149 float scene_farplane = 120000.0f;
 150
 151 static double delta_time_sec = 0;
 152
 153
 154 #ifdef FG_WEATHERCM
 155 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 156 #else
 157 #  include <Environment/environment_mgr.hxx>
 158 #endif
 159
 160 #include "version.h"
 161
 162 #include "fg_init.hxx"
 163 #include "fg_io.hxx"
 164 #include "fg_props.hxx"
 165 #include "globals.hxx"
 166 #include "splash.hxx"
 167 #include "viewmgr.hxx"
 168 #include "options.hxx"
 169 #include "logger.hxx"
 170
 171 #ifdef macintosh
 172 #  include <console.h>          // -dw- for command line dialog
 173 #endif
 174
 175
 176 FGEventMgr global_events;
 177
 178 // This is a record containing a bit of global housekeeping information
 179 FGGeneral general;
 180
 181 // Specify our current idle function state.  This is used to run all
 182 // our initializations out of the glutIdleLoop() so that we can get a
 183 // splash screen up and running right away.
 184 static int idle_state = 0;
 185 static long global_multi_loop;
 186
 187 // forward declaration
 188 void fgReshape( int width, int height );
 189
 190 // fog constants.  I'm a little nervous about putting actual code out
 191 // here but it seems to work (?)
 192 static const double m_log01 = -log( 0.01 );
 193 static const double sqrt_m_log01 = sqrt( m_log01 );
 194 static GLfloat fog_exp_density;
 195 static GLfloat fog_exp2_density;
 196 static GLfloat fog_exp2_punch_through;
 197
 198 ssgRoot *lighting = NULL;
 199 // ssgBranch *airport = NULL;
 200
 201 #ifdef FG_NETWORK_OLK
 202 ssgSelector *fgd_sel = NULL;
 203 ssgTransform *fgd_pos = NULL;
 204 #endif
 205
 206 // current fdm/position used for view
 207 FGInterface cur_view_fdm;
 208
 209 // Sky structures
 210 SGSky *thesky;
 211
 212 // hack
 213 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 214 {
 215   {  1.0f,  0.0f,  0.0f,  0.0f },
 216   {  0.0f,  0.0f, -1.0f,  0.0f },
 217   {  0.0f,  1.0f,  0.0f,  0.0f },
 218   {  0.0f,  0.0f,  0.0f,  1.0f }
 219 };
 220
 221 // The following defines flightgear options. Because glutlib will also
 222 // want to parse its own options, those options must not be included here
 223 // or they will get parsed by the main program option parser. Hence case
 224 // is significant for any option added that might be in conflict with
 225 // glutlib's parser.
 226 //
 227 // glutlib parses for:
 228 //    -display
 229 //    -direct   (invalid in Win32)
 230 //    -geometry
 231 //    -gldebug
 232 //    -iconized
 233 //    -indirect (invalid in Win32)
 234 //    -synce
 235 //
 236 // Note that glutlib depends upon strings while this program's
 237 // option parser wants only initial characters followed by numbers
 238 // or pathnames.
 239 //
 240
 241
 242 ssgSimpleState *default_state;
 243 ssgSimpleState *hud_and_panel;
 244 ssgSimpleState *menus;
 245
 246 SGTimeStamp last_time_stamp;
 247 SGTimeStamp current_time_stamp;
 248
 249 void fgBuildRenderStates( void ) {
 250     default_state = new ssgSimpleState;
 251     default_state->ref();
 252     default_state->disable( GL_TEXTURE_2D );
 253     default_state->enable( GL_CULL_FACE );
 254     default_state->enable( GL_COLOR_MATERIAL );
 255     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 256     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 257     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 258     default_state->disable( GL_BLEND );
 259     default_state->disable( GL_ALPHA_TEST );
 260     default_state->disable( GL_LIGHTING );
 261
 262     hud_and_panel = new ssgSimpleState;
 263     hud_and_panel->ref();
 264     hud_and_panel->disable( GL_CULL_FACE );
 265     hud_and_panel->disable( GL_TEXTURE_2D );
 266     hud_and_panel->disable( GL_LIGHTING );
 267     hud_and_panel->enable( GL_BLEND );
 268
 269     menus = new ssgSimpleState;
 270     menus->ref();
 271     menus->disable( GL_CULL_FACE );
 272     menus->disable( GL_TEXTURE_2D );
 273     menus->enable( GL_BLEND );
 274 }
 275
 276
 277 // fgInitVisuals() -- Initialize various GL/view parameters
 278 void fgInitVisuals( void ) {
 279     fgLIGHT *l;
 280
 281     l = &cur_light_params;
 282
 283 #ifndef GLUT_WRONG_VERSION
 284     // Go full screen if requested ...
 285     if ( fgGetBool("/sim/startup/fullscreen") ) {
 286         glutFullScreen();
 287     }
 288 #endif
 289
 290     // If enabled, normal vectors specified with glNormal are scaled
 291     // to unit length after transformation.  Enabling this has
 292     // performance implications.  See the docs for glNormal.
 293     // glEnable( GL_NORMALIZE );
 294
 295     glEnable( GL_LIGHTING );
 296     glEnable( GL_LIGHT0 );
 297     glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 298
 299     sgVec3 sunpos;
 300     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 301     ssgGetLight( 0 ) -> setPosition( sunpos );
 302
 303     glFogi (GL_FOG_MODE, GL_EXP2);
 304     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 305          (!fgGetBool("/sim/rendering/shading"))) {
 306         // if fastest fog requested, or if flat shading force fastest
 307         glHint ( GL_FOG_HINT, GL_FASTEST );
 308     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 309         glHint ( GL_FOG_HINT, GL_NICEST );
 310     }
 311     if ( fgGetBool("/sim/rendering/wireframe") ) {
 312         // draw wire frame
 313         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 314     }
 315
 316     // This is the default anyways, but it can't hurt
 317     glFrontFace ( GL_CCW );
 318
 319     // Just testing ...
 320     // glEnable(GL_POINT_SMOOTH);
 321     // glEnable(GL_LINE_SMOOTH);
 322     // glEnable(GL_POLYGON_SMOOTH);
 323 }
 324
 325
 326 // For HiRes screen Dumps using Brian Pauls TR Library
 327 void trRenderFrame( void ) {
 328
 329     if ( fgPanelVisible() ) {
 330         GLfloat height = fgGetInt("/sim/startup/ysize");
 331         GLfloat view_h =
 332             (current_panel->getViewHeight() - current_panel->getYOffset())
 333             * (height / 768.0) + 1;
 334         glTranslatef( 0.0, view_h, 0.0 );
 335     }
 336
 337     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 338     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 339
 340     fgLIGHT *l = &cur_light_params;
 341
 342     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 343                  l->adj_fog_color[2], l->adj_fog_color[3]);
 344
 345     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 346
 347     // set the opengl state to known default values
 348     default_state->force();
 349
 350     glEnable( GL_FOG );
 351     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 352     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 353     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 354
 355     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 356     // we only update GL_AMBIENT for our lights we will never get
 357     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 358     // explicitely to black.
 359     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 360
 361     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 362
 363     // texture parameters
 364     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 365     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 366
 367     // we need a white diffuse light for the phase of the moon
 368     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 369     thesky->preDraw();
 370
 371     // draw the ssg scene
 372     // return to the desired diffuse color
 373     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 374     glEnable( GL_DEPTH_TEST );
 375     ssgSetNearFar( scene_nearplane, scene_farplane );
 376     ssgCullAndDraw( globals->get_scene_graph() );
 377
 378     // draw the lights
 379     glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 380     ssgSetNearFar( scene_nearplane, scene_farplane );
 381     ssgCullAndDraw( lighting );
 382
 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
 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                                 longitude->getDoubleValue()
 541                                   * SGD_DEGREES_TO_RADIANS,
 542                                 latitude->getDoubleValue()
 543                                   * SGD_DEGREES_TO_RADIANS,
 544                                 altitude->getDoubleValue() * 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_white );
 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         global_tile_mgr.prep_ssg_nodes(visibility_meters);
 629
 630         if ( fgGetBool("/sim/rendering/skyblend") ) {
 631             // draw the sky backdrop
 632
 633             // we need a white diffuse light for the phase of the moon
 634             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 635
 636             thesky->preDraw();
 637
 638             // return to the desired diffuse color
 639             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 640         }
 641
 642         // draw the ssg scene
 643         glEnable( GL_DEPTH_TEST );
 644
 645         ssgSetNearFar( scene_nearplane, scene_farplane );
 646         ssgCullAndDraw( globals->get_scene_graph() );
 647
 648         // change state for lighting here
 649
 650         // draw lighting
 651         // Set punch through fog density
 652         glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 653
 654 #ifdef FG_EXPERIMENTAL_LIGHTING
 655         // Enable states for drawing points with GL_extension
 656         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 657             glEnable(GL_POINT_SMOOTH);
 658             float quadratic[3] = {1.0, 0.01, 0.0001};
 659             // get the address of our OpenGL extensions
 660 #if !defined(sgi)
 661             glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
 662                 wglGetProcAddress("glPointParameterfEXT");
 663             glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
 664                 wglGetProcAddress("glPointParameterfvEXT");
 665 #endif
 666             // makes the points fade as they move away
 667             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 668             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 669             glPointSize(4.0);
 670
 671             // Enable states for drawing runway lights with spherical mapping
 672             glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 673             glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 674             glEnable(GL_TEXTURE_GEN_S);
 675             glEnable(GL_TEXTURE_GEN_T);
 676
 677             //Maybe this is not the best way, but it works !!
 678             glPolygonMode(GL_FRONT, GL_POINT);
 679             glCullFace(GL_BACK);
 680             glEnable(GL_CULL_FACE);
 681         }
 682
 683         glDisable( GL_LIGHTING );
 684         // blending function for runway lights
 685         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 686         glEnable(GL_BLEND);
 687 #endif
 688
 689         ssgSetNearFar( scene_nearplane, scene_farplane );
 690         ssgCullAndDraw( lighting );
 691
 692
 693 #ifdef FG_EXPERIMENTAL_LIGHTING
 694         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 695             // Disable states used for runway lighting
 696             glPolygonMode(GL_FRONT, GL_FILL);
 697
 698             glDisable(GL_TEXTURE_GEN_S);
 699             glDisable(GL_TEXTURE_GEN_T);
 700             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 701                                   default_attenuation);
 702         }
 703
 704         glPointSize(1.0);
 705 #endif
 706
 707         if ( fgGetBool("/sim/rendering/skyblend") ) {
 708             // draw the sky cloud layers
 709             thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 710         }
 711
 712         globals->get_model_mgr()->draw();
 713         globals->get_aircraft_model()->draw();
 714
 715         // display HUD && Panel
 716         glDisable( GL_FOG );
 717         glDisable( GL_DEPTH_TEST );
 718         // glDisable( GL_CULL_FACE );
 719         // glDisable( GL_TEXTURE_2D );
 720
 721         // update the input subsystem
 722         current_input.update(delta_time_sec);
 723
 724         // update the controls subsystem
 725         globals->get_controls()->update(delta_time_sec);
 726
 727         hud_and_panel->apply();
 728         fgCockpitUpdate();
 729
 730         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 731         // This only works properly if called before the panel call
 732         globals->get_ATC_display()->update(delta_time_sec);
 733
 734         // update the panel subsystem
 735         if ( current_panel != NULL ) {
 736             current_panel->update(delta_time_sec);
 737         }
 738
 739         // We can do translucent menus, so why not. :-)
 740         menus->apply();
 741         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 742         puDisplay();
 743         // glDisable ( GL_BLEND ) ;
 744
 745         // glEnable( GL_FOG );
 746
 747         globals->get_logger()->update(delta_time_sec);
 748     }
 749
 750     glutSwapBuffers();
 751 }
 752
 753
 754 // Update internal time dependent calculations (i.e. flight model)
 755 // FIXME: this distinction is obsolete; all subsystems now get delta
 756 // time on update.
 757 void fgUpdateTimeDepCalcs() {
 758     static bool inited = false;
 759
 760     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 761
 762     fgLIGHT *l = &cur_light_params;
 763     int i;
 764
 765     long multi_loop = 1;
 766
 767     // Initialize the FDM here if it hasn't been and if we have a
 768     // scenery elevation hit.
 769
 770     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 771     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 772
 773     if ( !cur_fdm_state->get_inited() &&
 774          globals->get_scenery()->get_cur_elev() > -9990 )
 775     {
 776         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 777
 778         cur_fdm_state->init();
 779         if ( cur_fdm_state->get_bound() ) {
 780             cur_fdm_state->unbind();
 781         }
 782         cur_fdm_state->bind();
 783     }
 784
 785     // conceptually, the following block could be done for each fdm
 786     // instance ...
 787     if ( !cur_fdm_state->get_inited() ) {
 788         // do nothing, fdm isn't inited yet
 789     } else {
 790         // we have been inited, and  we are good to go ...
 791
 792         if ( !inited ) {
 793             inited = true;
 794         }
 795
 796         globals->get_autopilot()->update(delta_time_sec);
 797         cur_fdm_state->update(delta_time_sec);
 798         FGSteam::update(delta_time_sec);
 799     }
 800
 801     if ( !strcmp(fgGetString("/sim/view-mode"), "pilot") ) {
 802         cur_view_fdm = *cur_fdm_state;
 803         // do nothing
 804     }
 805
 806     globals->get_model_mgr()->update(delta_time_sec);
 807     globals->get_aircraft_model()->update(delta_time_sec);
 808
 809     // update the view angle
 810     globals->get_viewmgr()->update(delta_time_sec);
 811
 812     l->UpdateAdjFog();
 813
 814     // Update solar system
 815     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 816                                   globals->get_time_params()->getLst(),
 817                                   cur_fdm_state->get_Latitude() );
 818
 819     // Update radio stack model
 820     current_radiostack->update(delta_time_sec);
 821 }
 822
 823
 824 void fgInitTimeDepCalcs( void ) {
 825     // noop for now
 826 }
 827
 828
 829 static const double alt_adjust_ft = 3.758099;
 830 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 831
 832
 833 // What should we do when we have nothing else to do?  Let's get ready
 834 // for the next move and update the display?
 835 static void fgMainLoop( void ) {
 836
 837     // Update the elapsed time.
 838     current_time_stamp.stamp();
 839     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 840     last_time_stamp = current_time_stamp;
 841     globals->inc_sim_time_sec( delta_time_sec );
 842
 843     static const SGPropertyNode *longitude
 844         = fgGetNode("/position/longitude-deg");
 845     static const SGPropertyNode *latitude
 846         = fgGetNode("/position/latitude-deg");
 847     static const SGPropertyNode *altitude
 848         = fgGetNode("/position/altitude-ft");
 849     static const SGPropertyNode *clock_freeze
 850         = fgGetNode("/sim/freeze/clock", true);
 851     static const SGPropertyNode *cur_time_override
 852         = fgGetNode("/sim/time/cur-time-override", true);
 853
 854     static long remainder = 0;
 855     long elapsed;
 856 #ifdef FANCY_FRAME_COUNTER
 857     int i;
 858     double accum;
 859 #else
 860     static time_t last_time = 0;
 861     static int frames = 0;
 862 #endif // FANCY_FRAME_COUNTER
 863
 864     SGTime *t = globals->get_time_params();
 865
 866     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 867     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 868
 869 #ifdef FG_NETWORK_OLK
 870     if ( fgGetBool("/sim/networking/network-olk") ) {
 871         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
 872             // printf("FGD: Netupdate\n");
 873             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
 874             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
 875         }
 876     }
 877 #endif
 878
 879 #if defined( ENABLE_PLIB_JOYSTICK )
 880     // Read joystick and update control settings
 881     // if ( fgGetString("/sim/control-mode") == "joystick" )
 882     // {
 883     //    fgJoystickRead();
 884     // }
 885 #elif defined( ENABLE_GLUT_JOYSTICK )
 886     // Glut joystick support works by feeding a joystick handler
 887     // function to glut.  This is taken care of once in the joystick
 888     // init routine and we don't have to worry about it again.
 889 #endif
 890
 891 #ifndef FG_WEATHERCM
 892     globals->get_environment_mgr()->update(delta_time_sec);
 893 #endif
 894
 895     // Fix elevation.  I'm just sticking this here for now, it should
 896     // probably move eventually
 897
 898     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
 899            scenery.get_cur_elev(),
 900            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 901            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 902
 903     if ( globals->get_scenery()->get_cur_elev() > -9990
 904          && cur_fdm_state->get_inited() )
 905     {
 906         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
 907              (globals->get_scenery()->get_cur_elev() + alt_adjust_m - 3.0) ) {
 908             // now set aircraft altitude above ground
 909             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
 910                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 911                    globals->get_scenery()->get_cur_elev() + alt_adjust_m - 3.0,
 912                    globals->get_scenery()->get_cur_elev() + alt_adjust_m );
 913             cur_fdm_state->set_Altitude( globals->get_scenery()->get_cur_elev()
 914                                          + alt_adjust_m );
 915
 916             SG_LOG( SG_ALL, SG_DEBUG,
 917                     "<*> resetting altitude to "
 918                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
 919                     << " meters" );
 920         }
 921     }
 922
 923     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
 924            scenery.get_cur_elev(),
 925            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 926            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 927
 928     // cout << "Warp = " << globals->get_warp() << endl;
 929
 930     // update "time"
 931     static bool last_clock_freeze = false;
 932
 933     if ( clock_freeze->getBoolValue() ) {
 934         // clock freeze requested
 935         if ( cur_time_override->getLongValue() == 0 ) {
 936             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
 937             globals->set_warp( 0 );
 938         }
 939     } else {
 940         // no clock freeze requested
 941         if ( last_clock_freeze == true ) {
 942             // clock just unfroze, let's set warp as the difference
 943             // between frozen time and current time so we don't get a
 944             // time jump (and corresponding sky object and lighting
 945             // jump.)
 946             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
 947             fgSetLong( "/sim/time/cur-time-override", 0 );
 948         }
 949         if ( globals->get_warp_delta() != 0 ) {
 950             globals->inc_warp( globals->get_warp_delta() );
 951         }
 952     }
 953
 954     last_clock_freeze = clock_freeze->getBoolValue();
 955
 956     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 957                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 958                cur_time_override->getLongValue(),
 959                globals->get_warp() );
 960
 961     if ( globals->get_warp_delta() != 0 ) {
 962         fgUpdateSkyAndLightingParams();
 963     }
 964
 965     // update magvar model
 966     globals->get_mag()->update( longitude->getDoubleValue()
 967                                   * SGD_DEGREES_TO_RADIANS,
 968                                 latitude->getDoubleValue()
 969                                   * SGD_DEGREES_TO_RADIANS,
 970                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
 971                                 globals->get_time_params()->getJD() );
 972
 973     // Get elapsed time (in usec) for this past frame
 974     elapsed = fgGetTimeInterval();
 975     SG_LOG( SG_ALL, SG_DEBUG,
 976             "Elapsed time interval is = " << elapsed
 977             << ", previous remainder is = " << remainder );
 978
 979     // Calculate frame rate average
 980 #ifdef FANCY_FRAME_COUNTER
 981     /* old fps calculation */
 982     if ( elapsed > 0 ) {
 983         double tmp;
 984         accum = 0.0;
 985         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
 986             tmp = general.get_frame(i);
 987             accum += tmp;
 988             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
 989             general.set_frame(i+1,tmp);
 990         }
 991         tmp = 1000000.0 / (float)elapsed;
 992         general.set_frame(0,tmp);
 993         // printf("frame[0] = %.2f\n", general.frames[0]);
 994         accum += tmp;
 995         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
 996         // printf("ave = %.2f\n", general.frame_rate);
 997     }
 998 #else
 999     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1000         general.set_frame_rate( frames );
1001         SG_LOG( SG_ALL, SG_DEBUG,
1002                 "--> Frame rate is = " << general.get_frame_rate() );
1003         frames = 0;
1004     }
1005     last_time = t->get_cur_time();
1006     ++frames;
1007 #endif
1008
1009     // Run ATC subsystem
1010     globals->get_ATC_mgr()->update(delta_time_sec);
1011
1012     // Run the AI subsystem
1013     // globals->get_AI_mgr()->update(delta_time_sec);
1014
1015     // Run flight model
1016
1017     // Calculate model iterations needed for next frame
1018     elapsed += remainder;
1019
1020     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1021                               fgGetInt("/sim/model-hz"));
1022     remainder = elapsed - ( (global_multi_loop*1000000) /
1023                             fgGetInt("/sim/model-hz") );
1024     SG_LOG( SG_ALL, SG_DEBUG,
1025             "Model iterations needed = " << global_multi_loop
1026             << ", new remainder = " << remainder );
1027
1028     // chop max interations to something reasonable if the sim was
1029     // delayed for an excesive amount of time
1030     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1031         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1032         remainder = 0;
1033     }
1034
1035     // flight model
1036     if ( global_multi_loop > 0 ) {
1037         fgUpdateTimeDepCalcs();
1038     } else {
1039         SG_LOG( SG_ALL, SG_DEBUG,
1040                 "Elapsed time is zero ... we're zinging" );
1041     }
1042
1043 #if ! defined( macintosh )
1044     // Do any I/O channel work that might need to be done
1045     fgIOProcess();
1046 #endif
1047
1048     // see if we need to load any deferred-load textures
1049     material_lib.load_next_deferred();
1050
1051     // Run audio scheduler
1052 #ifdef ENABLE_AUDIO_SUPPORT
1053     if ( fgGetBool("/sim/sound/audible")
1054            && globals->get_soundmgr()->is_working() ) {
1055         globals->get_fx()->update(1); // FIXME: use dt
1056         globals->get_soundmgr()->update(1); // FIXME: use dt
1057     }
1058 #endif
1059
1060     // redraw display
1061     fgRenderFrame();
1062
1063     // see if we need to load any new scenery tiles
1064     double visibility_meters = fgGetDouble("/environment/visibility-m");
1065     global_tile_mgr.update( longitude->getDoubleValue(),
1066                             latitude->getDoubleValue(), visibility_meters );
1067
1068     SG_LOG( SG_ALL, SG_DEBUG, "" );
1069 }
1070
1071
1072 // This is the top level master main function that is registered as
1073 // our idle funciton
1074
1075 // The first few passes take care of initialization things (a couple
1076 // per pass) and once everything has been initialized fgMainLoop from
1077 // then on.
1078
1079 static void fgIdleFunction ( void ) {
1080     // printf("idle state == %d\n", idle_state);
1081
1082     if ( idle_state == 0 ) {
1083         // Initialize the splash screen right away
1084         if ( fgGetBool("/sim/startup/splash-screen") ) {
1085             fgSplashInit();
1086         }
1087
1088         idle_state++;
1089     } else if ( idle_state == 1 ) {
1090         // Initialize audio support
1091 #ifdef ENABLE_AUDIO_SUPPORT
1092
1093         // Start the intro music
1094         if ( fgGetBool("/sim/startup/intro-music") ) {
1095             SGPath mp3file( globals->get_fg_root() );
1096             mp3file.append( "Sounds/intro.mp3" );
1097
1098             SG_LOG( SG_GENERAL, SG_INFO,
1099                     "Starting intro music: " << mp3file.str() );
1100
1101 #if defined( __CYGWIN__ )
1102             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1103 #elif defined( WIN32 )
1104             string command = "start /m " + mp3file.str();
1105 #else
1106             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1107 #endif
1108
1109             system ( command.c_str() );
1110         }
1111
1112         // This is an 'easter egg' which is kind of a hard thing to
1113         // hide in an open source project -- so I won't try very hard
1114         // to hide it.  If you are looking at this now, please, you
1115         // don't want to ruin the surprise. :-) Just forget about it
1116         // and don't look any further; unless it is causing an actual
1117         // problem for you, which it shouldn't, and I hope it doesn't!
1118         // :-)
1119         if ( globals->get_time_params()->getGmt()->tm_mon == 4
1120              && globals->get_time_params()->getGmt()->tm_mday == 19 )
1121         {
1122             string url = "http://www.flightgear.org/Music/invasion.mp3";
1123 #if defined( __CYGWIN__ ) || defined( WIN32 )
1124             string command = "start /m " + url;
1125 #else
1126             string command = "mpg123 " + url + "> /dev/null 2>&1";
1127 #endif
1128             system( command.c_str() );
1129         }
1130
1131 #endif
1132
1133         idle_state++;
1134     } else if ( idle_state == 2 ) {
1135         // These are a few miscellaneous things that aren't really
1136         // "subsystems" but still need to be initialized.
1137
1138 #ifdef USE_GLIDE
1139         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1140             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1141         }
1142 #endif
1143
1144         idle_state++;
1145     } else if ( idle_state == 3 ) {
1146         // This is the top level init routine which calls all the
1147         // other subsystem initialization routines.  If you are adding
1148         // a subsystem to flightgear, its initialization call should
1149         // located in this routine.
1150         if( !fgInitSubsystems()) {
1151             SG_LOG( SG_GENERAL, SG_ALERT,
1152                     "Subsystem initializations failed ..." );
1153             exit(-1);
1154         }
1155
1156         idle_state++;
1157     } else if ( idle_state == 4 ) {
1158         // setup OpenGL view parameters
1159         fgInitVisuals();
1160
1161         idle_state++;
1162     } else if ( idle_state == 5 ) {
1163
1164         idle_state++;
1165     } else if ( idle_state == 6 ) {
1166         // sleep(1);
1167         idle_state = 1000;
1168
1169         cout << "Panel visible = " << fgPanelVisible() << endl;
1170         fgReshape( fgGetInt("/sim/startup/xsize"),
1171                    fgGetInt("/sim/startup/ysize") );
1172     }
1173
1174     if ( idle_state == 1000 ) {
1175         // We've finished all our initialization steps, from now on we
1176         // run the main loop.
1177
1178         glutIdleFunc(fgMainLoop);
1179     } else {
1180         if ( fgGetBool("/sim/startup/splash-screen") ) {
1181             fgSplashUpdate(0.0);
1182         }
1183     }
1184 }
1185
1186 // options.cxx needs to see this for toggle_panel()
1187 // Handle new window size or exposure
1188 void fgReshape( int width, int height ) {
1189     int view_h;
1190
1191     if ( (!fgGetBool("/sim/virtual-cockpit"))
1192          && fgPanelVisible() && idle_state == 1000 ) {
1193         view_h = (int)(height * (current_panel->getViewHeight() -
1194                                  current_panel->getYOffset()) / 768.0);
1195     } else {
1196         view_h = height;
1197     }
1198
1199     // for all views
1200     FGViewMgr *viewmgr = globals->get_viewmgr();
1201     for ( int i = 0; i < viewmgr->size(); ++i ) {
1202       viewmgr->get_view(i)->
1203         set_aspect_ratio((float)view_h / (float)width);
1204     }
1205
1206     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1207
1208     fgSetInt("/sim/startup/xsize", width);
1209     fgSetInt("/sim/startup/ysize", height);
1210     guiInitMouse(width, height);
1211
1212     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1213                viewmgr->get_current_view()->get_v_fov() );
1214
1215     fgHUDReshape();
1216 }
1217
1218 // Initialize GLUT and define a main window
1219 int fgGlutInit( int *argc, char **argv ) {
1220
1221 #if !defined( macintosh )
1222     // GLUT will extract all glut specific options so later on we only
1223     // need wory about our own.
1224     glutInit(argc, argv);
1225 #endif
1226
1227     // Define Display Parameters
1228     glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1229
1230     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1231             fgGetInt("/sim/startup/xsize") << "x"
1232             << fgGetInt("/sim/startup/ysize") );
1233
1234     // Define initial window size
1235     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1236                         fgGetInt("/sim/startup/ysize") );
1237
1238     // Initialize windows
1239     if ( !fgGetBool("/sim/startup/game-mode")) {
1240         // Open the regular window
1241         glutCreateWindow("FlightGear");
1242 #ifndef GLUT_WRONG_VERSION
1243     } else {
1244         // Open the cool new 'game mode' window
1245         char game_mode_str[256];
1246 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1247 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1248 #ifndef ENUM_CURRENT_SETTINGS
1249 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1250 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1251 #endif
1252
1253         DEVMODE dm;
1254         dm.dmSize = sizeof(DEVMODE);
1255         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1256         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1257         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1258         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1259                                                 fgGetInt("/sim/startup/ysize") );
1260         sprintf( game_mode_str, "%dx%d:%d@%d",
1261                          dm.dmPelsWidth,
1262                          dm.dmPelsHeight,
1263                          dm.dmBitsPerPel,
1264                          dm.dmDisplayFrequency );
1265 #else
1266         // Open the cool new 'game mode' window
1267         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1268                  fgGetInt("/sim/startup/xsize"),
1269                  fgGetInt("/sim/startup/ysize"),
1270                  fgGetInt("/sim/rendering/bits-per-pixel"));
1271
1272 #endif // HAVE_WINDOWS_H
1273         SG_LOG( SG_GENERAL, SG_INFO,
1274                 "game mode params = " << game_mode_str );
1275         glutGameModeString( game_mode_str );
1276         glutEnterGameMode();
1277 #endif // GLUT_WRONG_VERSION
1278     }
1279
1280     // This seems to be the absolute earliest in the init sequence
1281     // that these calls will return valid info.  Too bad it's after
1282     // we've already created and sized out window. :-(
1283     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1284     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1285     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1286     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1287
1288     GLint tmp;
1289     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1290     general.set_glMaxTexSize( tmp );
1291     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1292
1293     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1294     general.set_glDepthBits( tmp );
1295     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1296
1297     return 1;
1298 }
1299
1300
1301 // Initialize GLUT event handlers
1302 int fgGlutInitEvents( void ) {
1303     // call fgReshape() on window resizes
1304     glutReshapeFunc( fgReshape );
1305
1306     // keyboard and mouse callbacks are set in FGInput::init
1307
1308     // call fgMainLoop() whenever there is
1309     // nothing else to do
1310     glutIdleFunc( fgIdleFunction );
1311
1312     // draw the scene
1313     glutDisplayFunc( fgRenderFrame );
1314
1315     return 1;
1316 }
1317
1318
1319 // Main loop
1320 int mainLoop( int argc, char **argv ) {
1321
1322 #if defined( macintosh )
1323     freopen ("stdout.txt", "w", stdout );
1324     freopen ("stderr.txt", "w", stderr );
1325     argc = ccommand( &argv );
1326 #endif
1327
1328     // set default log levels
1329      sglog().setLogLevels( SG_ALL, SG_INFO );
1330
1331     string version;
1332 #ifdef FLIGHTGEAR_VERSION
1333     version = FLIGHTGEAR_VERSION;
1334 #else
1335     version = "unknown version";
1336 #endif
1337     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1338             << version << endl );
1339
1340     // Allocate global data structures.  This needs to happen before
1341     // we parse command line options
1342
1343     globals = new FGGlobals;
1344
1345 #ifndef FG_WEATHERCM
1346     globals->set_environment_mgr(new FGEnvironmentMgr);
1347 #endif
1348
1349     // seed the random number generater
1350     sg_srandom_time();
1351
1352     SGRoute *route = new SGRoute;
1353     globals->set_route( route );
1354
1355     FGControls *controls = new FGControls;
1356     globals->set_controls( controls );
1357
1358     string_list *col = new string_list;
1359     globals->set_channel_options_list( col );
1360
1361     // Scan the config file(s) and command line options to see if
1362     // fg_root was specified (ignore all other options for now)
1363     fgInitFGRoot(argc, argv);
1364
1365     // Check for the correct base package version
1366     string base_version = fgBasePackageVersion();
1367     if ( !(base_version == "0.7.9") ) {
1368         // tell the operator how to use this application
1369         fgUsage();
1370
1371         SG_LOG( SG_GENERAL, SG_ALERT, "Base package check failed ... "
1372                 << "Found version " << base_version << " at: "
1373                 << globals->get_fg_root() );
1374         SG_LOG( SG_GENERAL, SG_ALERT, "Please upgrade to version 0.7.9" );
1375         exit(-1);
1376     }
1377
1378     // Initialize the Aircraft directory to "" (UIUC)
1379     aircraft_dir = "";
1380
1381     // Load the configuration parameters
1382     if ( !fgInitConfig(argc, argv) ) {
1383         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1384         exit(-1);
1385     }
1386
1387     // Initialize the Window/Graphics environment.
1388     if( !fgGlutInit(&argc, argv) ) {
1389         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1390         exit(-1);
1391     }
1392
1393     // Initialize the various GLUT Event Handlers.
1394     if( !fgGlutInitEvents() ) {
1395         SG_LOG( SG_GENERAL, SG_ALERT,
1396                 "GLUT event handler initialization failed ..." );
1397         exit(-1);
1398     }
1399
1400     // Initialize plib net interface
1401     netInit( &argc, argv );
1402
1403     // Initialize ssg (from plib).  Needs to come before we do any
1404     // other ssg stuff, but after opengl/glut has been initialized.
1405     ssgInit();
1406
1407     // Initialize the user interface (we need to do this before
1408     // passing off control to glut and before fgInitGeneral to get our
1409     // fonts !!!
1410     guiInit();
1411
1412 #ifdef GL_EXT_texture_lod_bias
1413     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1414 #endif
1415
1416     // Set position relative to glide slope if requested
1417     fgSetPosFromGlideSlope();
1418
1419     // If we have an explicit, in-range lon/lat, use it.
1420     // If not, check for an airport-id and use that.
1421     // If not, default to the middle of the KSFO field.
1422     // The default values for lon/lat are deliberately out of range
1423     // so that the airport-id can take effect; valid lon/lat will
1424     // override airport-id, however.
1425     double lon_deg = fgGetDouble("/position/longitude-deg");
1426     double lat_deg = fgGetDouble("/position/latitude-deg");
1427     if (lon_deg < -180 || lon_deg > 180 || lat_deg < -90 || lat_deg > 90) {
1428       if ( fgGetString("/sim/startup/airport-id")[0] != '\0' ) {
1429         fgSetPosFromAirportIDandHdg( fgGetString("/sim/startup/airport-id"),
1430                                      fgGetDouble("/orientation/heading-deg") );
1431         // set tower position (a little off the heading for single
1432         // runway airports)
1433         fgSetTowerPosFromAirportID( fgGetString("/sim/startup/airport-id"),
1434                                     fgGetDouble("orientation/heading") );
1435       } else {
1436                                 // Default to middle of KSFO field
1437         fgSetDouble("/position/longitude-deg", -122.374843);
1438         fgSetDouble("/position/latitude-deg", 37.619002);
1439       }
1440     }
1441
1442     SGTime *t = fgInitTime();
1443     globals->set_time_params( t );
1444
1445     // Do some quick general initializations
1446     if( !fgInitGeneral()) {
1447         SG_LOG( SG_GENERAL, SG_ALERT,
1448                 "General initializations failed ..." );
1449         exit(-1);
1450     }
1451
1452     SGPath modelpath( globals->get_fg_root() );
1453     ssgModelPath( (char *)modelpath.c_str() );
1454
1455     // Scene graph root
1456     globals->set_scene_graph(new ssgRoot);
1457     globals->get_scene_graph()->setName( "Scene" );
1458
1459     lighting = new ssgRoot;
1460     lighting->setName( "Lighting" );
1461
1462     // Terrain branch
1463     globals->set_terrain_branch(new ssgBranch);
1464     globals->get_terrain_branch()->setName( "Terrain" );
1465     globals->get_scene_graph()->addKid( globals->get_terrain_branch() );
1466
1467     globals->set_models_branch(new ssgBranch);
1468     globals->get_models_branch()->setName( "Models" );
1469     globals->get_scene_graph()->addKid( globals->get_models_branch() );
1470
1471     globals->set_aircraft_branch(new ssgBranch);
1472     globals->get_aircraft_branch()->setName( "Aircraft" );
1473     globals->get_scene_graph()->addKid( globals->get_aircraft_branch() );
1474
1475     // Lighting
1476     globals->set_gnd_lights_branch(new ssgBranch);
1477     globals->get_gnd_lights_branch()->setName( "Ground Lighting" );
1478     lighting->addKid( globals->get_gnd_lights_branch() );
1479
1480     globals->set_rwy_lights_branch(new ssgBranch);
1481     globals->get_rwy_lights_branch()->setName( "Runway Lighting" );
1482     lighting->addKid( globals->get_rwy_lights_branch() );
1483
1484     ////////////////////////////////////////////////////////////////////
1485     // Initialize the general model subsystem.
1486     ////////////////////////////////////////////////////////////////////
1487
1488     globals->set_model_mgr(new FGModelMgr);
1489     globals->get_model_mgr()->init();
1490     globals->get_model_mgr()->bind();
1491
1492     ////////////////////////////////////////////////////////////////////
1493     // Initialize the 3D aircraft model subsystem.
1494     ////////////////////////////////////////////////////////////////////
1495
1496     globals->set_aircraft_model(new FGAircraftModel);
1497     globals->get_aircraft_model()->init();
1498     globals->get_aircraft_model()->bind();
1499
1500     ////////////////////////////////////////////////////////////////////
1501     // Initialize the view manager subsystem.
1502     ////////////////////////////////////////////////////////////////////
1503
1504     FGViewMgr *viewmgr = new FGViewMgr;
1505     globals->set_viewmgr( viewmgr );
1506     viewmgr->init();
1507     viewmgr->bind();
1508
1509
1510     // Initialize the sky
1511     SGPath ephem_data_path( globals->get_fg_root() );
1512     ephem_data_path.append( "Astro" );
1513     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1514     ephem->update( globals->get_time_params()->getMjd(),
1515                    globals->get_time_params()->getLst(),
1516                    0.0 );
1517     globals->set_ephem( ephem );
1518
1519     thesky = new SGSky;
1520
1521     SGPath sky_tex_path( globals->get_fg_root() );
1522     sky_tex_path.append( "Textures" );
1523     sky_tex_path.append( "Sky" );
1524     thesky->texture_path( sky_tex_path.str() );
1525
1526     thesky->build( 550.0, 550.0,
1527                    globals->get_ephem()->getNumPlanets(),
1528                    globals->get_ephem()->getPlanets(), 60000.0,
1529                    globals->get_ephem()->getNumStars(),
1530                    globals->get_ephem()->getStars(), 60000.0 );
1531
1532     if ( fgGetBool("/environment/clouds/status") ) {
1533         // thesky->add_cloud_layer( 2000.0, 200.0, 50.0, 40000.0,
1534         //                          SG_CLOUD_OVERCAST );
1535         thesky->add_cloud_layer( fgGetDouble("/environment/clouds/altitude-ft") *
1536                                  SG_FEET_TO_METER,
1537                                  200.0, 50.0, 40000.0,
1538                                  SG_CLOUD_MOSTLY_CLOUDY );
1539         // thesky->add_cloud_layer( 3000.0, 200.0, 50.0, 40000.0,
1540         //                          SG_CLOUD_MOSTLY_SUNNY );
1541         thesky->add_cloud_layer( 6000.0, 20.0, 10.0, 40000.0,
1542                                  SG_CLOUD_CIRRUS );
1543     }
1544
1545     // Initialize MagVar model
1546     SGMagVar *magvar = new SGMagVar();
1547     globals->set_mag( magvar );
1548
1549     // airport = new ssgBranch;
1550     // airport->setName( "Airport Lighting" );
1551     // lighting->addKid( airport );
1552
1553     // ADA
1554     fgLoadDCS();
1555     // ADA
1556
1557 #ifdef FG_NETWORK_OLK
1558     // Do the network intialization
1559     if ( fgGetBool("/sim/networking/network-olk") ) {
1560         printf("Multipilot mode %s\n",
1561                fg_net_init( globals->get_scene_graph() ) );
1562     }
1563 #endif
1564
1565     // build our custom render states
1566     fgBuildRenderStates();
1567
1568     // pass control off to the master GLUT event handler
1569     glutMainLoop();
1570
1571     // we never actually get here ... but to avoid compiler warnings,
1572     // etc.
1573     return 0;
1574 }
1575
1576
1577 // $$$ end - added VS Renganathan, 15 Oct 2K
1578 //         - added Venky         , 12 Nov 2K
1579
1580 #if defined(__linux__) && defined(__i386__)
1581
1582 static void handleFPE (int);
1583
1584 static void
1585 initFPE ()
1586 {
1587     fpu_control_t fpe_flags = 0;
1588     _FPU_GETCW(fpe_flags);
1589 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1590 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1591 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1592 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1593 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1594 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1595     _FPU_SETCW(fpe_flags);
1596     signal(SIGFPE, handleFPE);
1597 }
1598
1599 static void
1600 handleFPE (int num)
1601 {
1602   initFPE();
1603   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1604 }
1605 #endif
1606
1607 // Main entry point; catch any exceptions that have made it this far.
1608 int main ( int argc, char **argv ) {
1609
1610     // Enable floating-point exceptions for Linux/x86
1611 #if defined(__linux__) && defined(__i386__)
1612     initFPE();
1613 #endif
1614
1615     // Enable floating-point exceptions for Windows
1616 #if defined( _MSC_VER ) && defined( DEBUG )
1617     // Christian, we should document what this does
1618     _control87( _EM_INEXACT, _MCW_EM );
1619 #endif
1620
1621 #if defined( HAVE_BC5PLUS )
1622     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1623 #endif
1624
1625     // FIXME: add other, more specific
1626     // exceptions.
1627     try {
1628         mainLoop(argc, argv);
1629     } catch (sg_throwable &t) {
1630                                 // We must use cerr rather than
1631                                 // logging, since logging may be
1632                                 // disabled.
1633         cerr << "Fatal error: " << t.getFormattedMessage()
1634              << "\n (received from " << t.getOrigin() << ')' << endl;
1635         exit(1);
1636     }
1637
1638     return 0;
1639 }
1640
1641
1642 void fgLoadDCS(void) {
1643
1644     ssgEntity *ship_obj = NULL;
1645
1646     char obj_filename[25];
1647
1648     for ( int k = 0; k < 32; k++ ) {
1649         ship_pos[k]=NULL;
1650     }
1651
1652     SGPath tile_path( globals->get_fg_root());
1653     tile_path.append( "Scenery" );
1654     tile_path.append( "Objects.txt" );
1655     sg_gzifstream in( tile_path.str() );
1656     if ( ! in.is_open() ) {
1657         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1658     } else {
1659
1660         SGPath modelpath( globals->get_fg_root() );
1661         modelpath.append( "Models" );
1662         modelpath.append( "Geometry" );
1663
1664         SGPath texturepath( globals->get_fg_root() );
1665         texturepath.append( "Models" );
1666         texturepath.append( "Textures" );
1667
1668         ssgModelPath( (char *)modelpath.c_str() );
1669         ssgTexturePath( (char *)texturepath.c_str() );
1670
1671         ship_sel = new ssgSelector;
1672
1673         char c;
1674         while ( ! in.eof() ) {
1675             in >> ::skipws;
1676             if ( in.get( c ) && c == '#' ) {
1677                 in >> skipeol;
1678             } else {
1679                 in.putback(c);
1680                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1681                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1682                    int chj=getchar();*/
1683
1684                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1685                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1686
1687                 ship_pos[objc] = new ssgTransform;
1688
1689                 // type "repeat" in objects.txt to load one more
1690                 // instance of the last object.
1691
1692                 if ( strcmp(obj_filename,"repeat") != 0) {
1693                     ship_obj = ssgLoad( obj_filename );
1694                 }
1695
1696                 if ( ship_obj != NULL ) {
1697                                         ship_obj->setName(obj_filename);
1698                                 if (objc == 0)
1699                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1700                                         else
1701                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1702                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1703                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1704                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1705                             << obj_filename );
1706                 } else {
1707                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1708                             << obj_filename );
1709                 }
1710
1711                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1712                                 //const char *extn = file_extension ( obj_filename ) ;
1713                                 if ( objc == 1 ){
1714                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1715                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1716                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1717                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1718                                         int ltype[500], light_type;
1719                                         static int ltcount = 0;
1720                                     string token;
1721                                         sgVec3 rway_dir,rway_normal,lightpt;
1722                                         Point3D node;
1723                                         modelpath.append(obj_filename);
1724                                         sg_gzifstream in1( modelpath.str() );
1725                                         if ( ! in1.is_open() ) {
1726                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1727                                         } else {
1728                                                 while ( ! in1.eof() ) {
1729                                                         in1 >> ::skipws;
1730                                                         if ( in1.get( c ) && c == '#' ) {
1731                                                                 in1 >> skipeol;
1732                                                         } else {
1733                                                                 in1.putback(c);
1734                                                                 in1 >> token;
1735                                                                 //cout << token << endl;
1736                                                                 if ( token == "runway" ) {
1737                                                                         in1 >> node;
1738                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1739                                                                 } else if ( token == "edgelight" ) {
1740                                                                         in1 >> node;
1741                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1742                                                                         light_type = 1;
1743                                                                 } else if ( token == "taxi" ) {
1744                                                                         in1 >> node;
1745                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1746                                                                         light_type = 2;
1747                                                                 } else if ( token == "vasi" ) {
1748                                                                         in1 >> node;
1749                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1750                                                                         light_type = 3;
1751                                                                 } else if ( token == "threshold" ) {
1752                                                                         in1 >> node;
1753                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1754                                                                         light_type = 4;
1755                                                                 } else if ( token == "rabbit" ) {
1756                                                                         in1 >> node;
1757                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1758                                                                         light_type = 5;
1759                                                                 } else if ( token == "ols" ) {
1760                                                                         in1 >> node;
1761                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1762                                                                         light_type = 6;
1763                                                                 } else if ( token == "red" ) {
1764                                                                         in1 >> node;
1765                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1766                                                                         light_type = 7;
1767                                                                 } else if ( token == "green" ) {
1768                                                                         in1 >> node;
1769                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1770                                                                         light_type = 8;
1771                                                                 } else if ( token == "lp" ) {
1772                                                                         in1 >> node;
1773                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1774                                                                         lightpoints->add( lightpt );
1775                                                                         lightnormals->add( rway_normal );
1776                                                                         lightdir->add( rway_dir );
1777                                                                         ltype[ltcount]= light_type;
1778                                                                         ltcount++;
1779                                                                 }
1780                                                                 if (in1.eof()) break;
1781                                                         }
1782                                                 }  //while
1783
1784                                                 if ( lightpoints->getNum() ) {
1785                                                         ssgBranch *lightpoints_branch;
1786                                                         long int dummy = -999;
1787                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1788                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1789                                                         dummy_tile->ols_transform = new ssgTransform;
1790
1791                                                         // call function to generate the runway lights
1792                                                         lightpoints_branch =
1793                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1794                                                                                                                                 lightdir, ltype);
1795                                                         lightpoints_brightness->addKid(lightpoints_branch);
1796                                                         lightpoints_transform->addKid(lightpoints_brightness);
1797                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1798                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1799                                                         lightpoints_transform->ref();
1800                                                         globals->get_gnd_lights_branch()->addKid( lightpoints_transform );
1801                                                 }
1802                                         } //if in1
1803                 } //if objc
1804                                 // end hack for deck lights
1805
1806                 objc++;
1807
1808                 if (in.eof()) break;
1809             }
1810         } // while
1811
1812         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
1813
1814         globals->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
1815     }
1816
1817     return;
1818  }
1819
1820
1821 void fgUpdateDCS (void) {
1822
1823     // double eye_lat,eye_lon,eye_alt;
1824     // static double obj_head;
1825     double sl_radius,obj_latgc;
1826     // float nresultmat[4][4];
1827     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
1828     double bz[3];
1829
1830     // Instantaneous Geodetic Lat/Lon/Alt of moving object
1831     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
1832
1833     // Deck should be the first object in objects.txt in case of fdm=ada
1834
1835     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
1836                 if ((fdm->get_iaux(1))==1)
1837                 {
1838                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
1839                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
1840                         obj_alt[1] = fdm->get_daux(3);
1841                         obj_pitch[1] = fdm->get_faux(1);
1842                         obj_roll[1] = fdm->get_faux(2);
1843                 }
1844     }
1845
1846     for ( int m = 0; m < objc; m++ ) {
1847         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
1848         //int v=getchar();
1849
1850         //Geodetic to Geocentric angles for rotation
1851         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
1852
1853         //moving object gbs-posn in cartesian coords
1854         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
1855         Point3D obj_pos = sgGeodToCart( obj_posn );
1856
1857         // Translate moving object w.r.t eye
1858         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
1859         bz[0]=Objtrans.x();
1860         bz[1]=Objtrans.y();
1861         bz[2]=Objtrans.z();
1862
1863        // rotate dynamic objects for lat,lon & alt and other motion about its axes
1864
1865         sgMat4 sgTRANS;
1866         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
1867
1868         sgVec3 ship_fwd,ship_rt,ship_up;
1869         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
1870         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
1871         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
1872
1873         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
1874         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
1875         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
1876         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
1877         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
1878         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
1879
1880         sgMat4 sgTUX;
1881         sgCopyMat4( sgTUX, sgROT_hdg );
1882         sgPostMultMat4( sgTUX, sgROT_pitch );
1883         sgPostMultMat4( sgTUX, sgROT_roll );
1884         sgPostMultMat4( sgTUX, sgROT_lat );
1885         sgPostMultMat4( sgTUX, sgROT_lon );
1886         sgPostMultMat4( sgTUX, sgTRANS );
1887
1888         sgCoord shippos;
1889         sgSetCoord(&shippos, sgTUX );
1890         ship_pos[m]->setTransform( &shippos );
1891         // temporary hack for deck lights - ultimately should move to PLib (when ??)
1892         if (m == 1) {
1893                 if (lightpoints_transform) {
1894                         lightpoints_transform->setTransform( &shippos );
1895                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
1896                         if ( sun_angle > 89 ) {
1897                                 lightpoints_brightness->select(0x01);
1898                         } else {
1899                                 lightpoints_brightness->select(0x00);
1900                         }
1901                 }
1902
1903                 float elev;
1904                 sgVec3 rp,to;
1905                 float *vp;
1906                 float alt;
1907                 float ref_elev;
1908                 sgXformPnt3( rp, rway_ols, sgTUX );
1909                 vp = globals->get_current_view()->get_view_pos();
1910             to[0] = rp[0]-vp[0];
1911             to[1] = rp[1]-vp[1];
1912             to[2] = rp[2]-vp[2];
1913                 float dist = sgLengthVec3( to );
1914                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
1915
1916                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
1917
1918             ref_elev = elev - 3.75; // +ve above, -ve below
1919
1920                 unsigned int sel;
1921                 sel = 0xFF;
1922 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1923 //              if (ref_elev > 0.51) sel = 0x21;
1924 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
1925 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
1926 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
1927 //              if (ref_elev < -0.51) sel = 0x30;
1928 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1929                 dummy_tile->lightmaps_sequence->select(sel);
1930
1931                 sgVec3 up;
1932                 sgCopyVec3 (up, ship_up);
1933                 if (dist > 750)
1934                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
1935                 else
1936                         sgScaleVec3 (up, 4.0*ref_elev);
1937                 dummy_tile->ols_transform->setTransform(up);
1938                 //cout << "ref_elev  " << ref_elev << endl;
1939         }
1940     // end hack for deck lights
1941
1942     }
1943     if ( ship_sel != NULL ) {
1944         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
1945     }
1946 }
1947
1948 // $$$ end - added VS Renganathan, 15 Oct 2K
1949 //           added Venky         , 12 Nov 2K