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 SG_USING_STD(cerr);
  37 SG_USING_STD(endl);
  38
  39 #include <simgear/misc/exception.hxx>
  40 #include <simgear/ephemeris/ephemeris.hxx>
  41 #include <simgear/route/route.hxx>
  42
  43 #ifdef SG_MATH_EXCEPTION_CLASH
  44 #  include <math.h>
  45 #endif
  46
  47 #ifdef HAVE_WINDOWS_H
  48 #  include <windows.h>
  49 #  include <float.h>
  50 #endif
  51
  52 #include GLUT_H
  53
  54 #include <stdio.h>
  55 #include <string.h>             // for strcmp()
  56 #include <string>
  57
  58 #ifdef HAVE_STDLIB_H
  59 #   include <stdlib.h>
  60 #endif
  61
  62 #ifdef HAVE_SYS_STAT_H
  63 #  include <sys/stat.h>         // for stat()
  64 #endif
  65
  66 #ifdef HAVE_UNISTD_H
  67 #  include <unistd.h>           // for stat()
  68 #endif
  69
  70 #include <plib/netChat.h>
  71 #include <plib/pu.h>
  72 #include <plib/sg.h>
  73 #include <plib/ssg.h>
  74
  75 #include <simgear/constants.h>  // for VERSION
  76 #include <simgear/debug/logstream.hxx>
  77 #include <simgear/math/polar3d.hxx>
  78 #include <simgear/math/sg_random.h>
  79 #include <simgear/misc/sg_path.hxx>
  80 #include <simgear/scene/model/animation.hxx>
  81 #include <simgear/scene/model/location.hxx>
  82 #ifdef FG_USE_CLOUDS_3D
  83 #  include <simgear/sky/clouds3d/SkySceneLoader.hpp>
  84 #  include <simgear/sky/clouds3d/SkyUtil.hpp>
  85 #endif
  86 #include <simgear/sky/sky.hxx>
  87 #include <simgear/timing/sg_time.hxx>
  88
  89 #include <Include/general.hxx>
  90
  91 #include <Aircraft/aircraft.hxx>
  92
  93 #include <ATC/ATCmgr.hxx>
  94 #include <ATC/ATCdisplay.hxx>
  95 #include <ATC/AIMgr.hxx>
  96
  97
  98 #include <Autopilot/newauto.hxx>
  99
 100 #include <Cockpit/hud.hxx>
 101 #include <Cockpit/cockpit.hxx>
 102 #include <Cockpit/radiostack.hxx>
 103
 104 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 105 #include <GUI/gui.h>
 106 #include <Model/acmodel.hxx>
 107 #include <Model/loader.hxx>
 108 #include <Model/model.hxx>
 109 #include <Model/modelmgr.hxx>
 110 #include <Model/panelnode.hxx>
 111 #ifdef FG_NETWORK_OLK
 112 #include <NetworkOLK/network.h>
 113 #endif
 114
 115 #ifdef FG_MPLAYER_AS
 116 #include <MultiPlayer/multiplaytxmgr.hxx>
 117 #include <MultiPlayer/multiplayrxmgr.hxx>
 118 #endif
 119
 120 #include <Objects/matlib.hxx>
 121 #include <Scenery/scenery.hxx>
 122 #include <Scenery/tilemgr.hxx>
 123 #ifdef ENABLE_AUDIO_SUPPORT
 124 #  include <Sound/soundmgr.hxx>
 125 #  include <Sound/fg_fx.hxx>
 126 #  include <Sound/morse.hxx>
 127 #endif
 128 #include <Systems/system_mgr.hxx>
 129 #include <Instrumentation/instrument_mgr.hxx>
 130 #include <Time/FGEventMgr.hxx>
 131 #include <Time/fg_timer.hxx>
 132 #include <Time/light.hxx>
 133 #include <Time/sunpos.hxx>
 134 #include <Time/tmp.hxx>
 135
 136 // ADA
 137 #include <simgear/misc/sgstream.hxx>
 138 #include <simgear/math/point3d.hxx>
 139 #include <FDM/flight.hxx>
 140 #include <FDM/ADA.hxx>
 141 #include <Scenery/tileentry.hxx>
 142
 143 #include "fg_commands.hxx"
 144
 145 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 146 #ifdef WIN32
 147   typedef void (APIENTRY * PFNGLPOINTPARAMETERFEXTPROC)(GLenum pname,
 148                                                         GLfloat param);
 149   typedef void (APIENTRY * PFNGLPOINTPARAMETERFVEXTPROC)(GLenum pname,
 150                                                          const GLfloat *params);
 151
 152   PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 153   PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 154 #elif linux
 155   #include <GL/glx.h>
 156
 157   typedef void (* OpenGLFuncExt)(GLenum pname, GLfloat param);
 158   typedef void (* OpenGLFuncExtv)(GLenum pname, const GLfloat *params);
 159
 160   OpenGLFuncExt glPointParameterfEXT = 0;
 161   OpenGLFuncExtv glPointParameterfvEXT = 0;
 162 #endif
 163 #endif
 164
 165 float default_attenuation[3] = {1.0, 0.0, 0.0};
 166 //Required for using GL_extensions
 167 void fgLoadDCS (void);
 168 void fgUpdateDCS (void);
 169 ssgSelector *ship_sel=NULL;
 170 // upto 32 instances of a same object can be loaded.
 171 ssgTransform *ship_pos[32];
 172 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 173 int objc=0;
 174 ssgSelector *lightpoints_brightness = new ssgSelector;
 175 ssgTransform *lightpoints_transform = new ssgTransform;
 176 FGTileEntry *dummy_tile;
 177 sgVec3 rway_ols;
 178 // ADA
 179 // Clip plane settings...
 180 float scene_nearplane = 0.5f;
 181 float scene_farplane = 120000.0f;
 182
 183 static double delta_time_sec = 0;
 184
 185
 186 #ifdef FG_WEATHERCM
 187 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 188 #else
 189 #  include <Environment/environment_mgr.hxx>
 190 #endif
 191
 192 #include "version.h"
 193
 194 #include "fg_init.hxx"
 195 #include "fg_io.hxx"
 196 #include "fg_props.hxx"
 197 #include "globals.hxx"
 198 #include "splash.hxx"
 199 #include "viewmgr.hxx"
 200 #include "options.hxx"
 201 #include "logger.hxx"
 202
 203 #ifdef macintosh
 204 #  include <console.h>          // -dw- for command line dialog
 205 #endif
 206
 207
 208 FGEventMgr global_events;
 209
 210 // This is a record containing a bit of global housekeeping information
 211 FGGeneral general;
 212
 213 // Specify our current idle function state.  This is used to run all
 214 // our initializations out of the glutIdleLoop() so that we can get a
 215 // splash screen up and running right away.
 216 static int idle_state = 0;
 217 static long global_multi_loop;
 218
 219 // fog constants.  I'm a little nervous about putting actual code out
 220 // here but it seems to work (?)
 221 static const double m_log01 = -log( 0.01 );
 222 static const double sqrt_m_log01 = sqrt( m_log01 );
 223 static GLfloat fog_exp_density;
 224 static GLfloat fog_exp2_density;
 225 static GLfloat rwy_exp2_punch_through;
 226 static GLfloat taxi_exp2_punch_through;
 227 static GLfloat ground_exp2_punch_through;
 228
 229 #ifdef FG_NETWORK_OLK
 230 ssgSelector *fgd_sel = NULL;
 231 ssgTransform *fgd_pos = NULL;
 232 #endif
 233
 234 // Sky structures
 235 SGSky *thesky;
 236
 237 #ifdef FG_USE_CLOUDS_3D
 238   SkySceneLoader *sgClouds3d;
 239   bool _bcloud_orig = true;
 240 #endif
 241
 242 // hack
 243 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 244 {
 245   {  1.0f,  0.0f,  0.0f,  0.0f },
 246   {  0.0f,  0.0f, -1.0f,  0.0f },
 247   {  0.0f,  1.0f,  0.0f,  0.0f },
 248   {  0.0f,  0.0f,  0.0f,  1.0f }
 249 };
 250
 251 // The following defines flightgear options. Because glutlib will also
 252 // want to parse its own options, those options must not be included here
 253 // or they will get parsed by the main program option parser. Hence case
 254 // is significant for any option added that might be in conflict with
 255 // glutlib's parser.
 256 //
 257 // glutlib parses for:
 258 //    -display
 259 //    -direct   (invalid in Win32)
 260 //    -geometry
 261 //    -gldebug
 262 //    -iconized
 263 //    -indirect (invalid in Win32)
 264 //    -synce
 265 //
 266 // Note that glutlib depends upon strings while this program's
 267 // option parser wants only initial characters followed by numbers
 268 // or pathnames.
 269 //
 270
 271
 272 ssgSimpleState *cloud3d_imposter_state;
 273 ssgSimpleState *default_state;
 274 ssgSimpleState *hud_and_panel;
 275 ssgSimpleState *menus;
 276
 277 SGTimeStamp last_time_stamp;
 278 SGTimeStamp current_time_stamp;
 279
 280
 281 void fgBuildRenderStates( void ) {
 282     default_state = new ssgSimpleState;
 283     default_state->ref();
 284     default_state->disable( GL_TEXTURE_2D );
 285     default_state->enable( GL_CULL_FACE );
 286     default_state->enable( GL_COLOR_MATERIAL );
 287     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 288     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 289     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 290     default_state->disable( GL_BLEND );
 291     default_state->disable( GL_ALPHA_TEST );
 292     default_state->disable( GL_LIGHTING );
 293
 294     cloud3d_imposter_state = new ssgSimpleState;
 295     cloud3d_imposter_state->ref();
 296     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 297     cloud3d_imposter_state->enable( GL_CULL_FACE );
 298     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 299     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 300     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 301     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 302     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 303     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 304     cloud3d_imposter_state->enable( GL_BLEND );
 305     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 306     cloud3d_imposter_state->disable( GL_LIGHTING );
 307
 308     hud_and_panel = new ssgSimpleState;
 309     hud_and_panel->ref();
 310     hud_and_panel->disable( GL_CULL_FACE );
 311     hud_and_panel->disable( GL_TEXTURE_2D );
 312     hud_and_panel->disable( GL_LIGHTING );
 313     hud_and_panel->enable( GL_BLEND );
 314
 315     menus = new ssgSimpleState;
 316     menus->ref();
 317     menus->disable( GL_CULL_FACE );
 318     menus->disable( GL_TEXTURE_2D );
 319     menus->enable( GL_BLEND );
 320 }
 321
 322
 323 // fgInitVisuals() -- Initialize various GL/view parameters
 324 void fgInitVisuals( void ) {
 325     fgLIGHT *l;
 326
 327     l = &cur_light_params;
 328
 329 #ifndef GLUT_WRONG_VERSION
 330     // Go full screen if requested ...
 331     if ( fgGetBool("/sim/startup/fullscreen") ) {
 332         glutFullScreen();
 333     }
 334 #endif
 335
 336     // If enabled, normal vectors specified with glNormal are scaled
 337     // to unit length after transformation.  Enabling this has
 338     // performance implications.  See the docs for glNormal.
 339     // glEnable( GL_NORMALIZE );
 340
 341     glEnable( GL_LIGHTING );
 342     glEnable( GL_LIGHT0 );
 343     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 344
 345     sgVec3 sunpos;
 346     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 347     ssgGetLight( 0 ) -> setPosition( sunpos );
 348
 349     glFogi (GL_FOG_MODE, GL_EXP2);
 350     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 351          (!fgGetBool("/sim/rendering/shading"))) {
 352         // if fastest fog requested, or if flat shading force fastest
 353         glHint ( GL_FOG_HINT, GL_FASTEST );
 354     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 355         glHint ( GL_FOG_HINT, GL_NICEST );
 356     }
 357     if ( fgGetBool("/sim/rendering/wireframe") ) {
 358         // draw wire frame
 359         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 360     }
 361
 362     // This is the default anyways, but it can't hurt
 363     glFrontFace ( GL_CCW );
 364
 365     // Just testing ...
 366     // glEnable(GL_POINT_SMOOTH);
 367     // glEnable(GL_LINE_SMOOTH);
 368     // glEnable(GL_POLYGON_SMOOTH);
 369 }
 370
 371
 372 // For HiRes screen Dumps using Brian Pauls TR Library
 373 void trRenderFrame( void ) {
 374
 375     if ( fgPanelVisible() ) {
 376         GLfloat height = fgGetInt("/sim/startup/ysize");
 377         GLfloat view_h =
 378             (globals->get_current_panel()->getViewHeight() - globals->get_current_panel()->getYOffset())
 379             * (height / 768.0) + 1;
 380         glTranslatef( 0.0, view_h, 0.0 );
 381     }
 382
 383     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 384     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 385
 386     fgLIGHT *l = &cur_light_params;
 387
 388     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 389                  l->adj_fog_color[2], l->adj_fog_color[3]);
 390
 391     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 392
 393     // set the opengl state to known default values
 394     default_state->force();
 395
 396     glEnable( GL_FOG );
 397     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 398     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 399     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 400
 401     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 402     // we only update GL_AMBIENT for our lights we will never get
 403     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 404     // explicitely to black.
 405     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 406     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 407
 408     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 409
 410     // texture parameters
 411     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 412     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 413
 414     // we need a white diffuse light for the phase of the moon
 415     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 416     thesky->preDraw();
 417
 418     // draw the ssg scene
 419     // return to the desired diffuse color
 420     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 421     glEnable( GL_DEPTH_TEST );
 422     ssgSetNearFar( scene_nearplane, scene_farplane );
 423     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 424
 425     // draw the lights
 426     glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 427     ssgSetNearFar( scene_nearplane, scene_farplane );
 428     ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 429
 430     ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 431
 432     if (fgGetBool("/environment/clouds/status"))
 433         thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 434
 435     globals->get_model_mgr()->draw();
 436     globals->get_aircraft_model()->draw();
 437 }
 438
 439
 440 // Update all Visuals (redraws anything graphics related)
 441 void fgRenderFrame() {
 442
 443     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 444     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 445
 446     // Process/manage pending events
 447     global_events.update( delta_time_sec );
 448
 449     // static const SGPropertyNode *longitude
 450     //     = fgGetNode("/position/longitude-deg");
 451     // static const SGPropertyNode *latitude
 452     //     = fgGetNode("/position/latitude-deg");
 453     // static const SGPropertyNode *altitude
 454     //     = fgGetNode("/position/altitude-ft");
 455     static const SGPropertyNode *groundlevel_nearplane
 456         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 457
 458     // Update the default (kludged) properties.
 459     fgUpdateProps();
 460
 461     FGViewer *current__view = globals->get_current_view();
 462
 463     fgLIGHT *l = &cur_light_params;
 464     static double last_visibility = -9999;
 465
 466     // update fog params
 467     double actual_visibility;
 468     if (fgGetBool("/environment/clouds/status"))
 469         actual_visibility = thesky->get_visibility();
 470     else
 471         actual_visibility = fgGetDouble("/environment/visibility-m");
 472     if ( actual_visibility != last_visibility ) {
 473         last_visibility = actual_visibility;
 474
 475         fog_exp_density = m_log01 / actual_visibility;
 476         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 477         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 478         if ( actual_visibility < 8000 ) {
 479             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 480             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 481         } else {
 482             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 483             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 484         }
 485     }
 486
 487     // double angle;
 488     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 489     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 490     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 491     // GLfloat mat_shininess[] = { 10.0 };
 492     GLbitfield clear_mask;
 493
 494     if ( idle_state != 1000 ) {
 495         // still initializing, draw the splash screen
 496         if ( fgGetBool("/sim/startup/splash-screen") ) {
 497             fgSplashUpdate(0.0, 1.0);
 498         }
 499         // Keep resetting sim time while the sim is initializing
 500         globals->set_sim_time_sec( 0.0 );
 501         Animation::set_sim_time_sec( 0.0 );
 502     } else {
 503         // idle_state is now 1000 meaning we've finished all our
 504         // initializations and are running the main loop, so this will
 505         // now work without seg faulting the system.
 506
 507         // calculate our current position in cartesian space
 508         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 509
 510         // update view port
 511         fgReshape( fgGetInt("/sim/startup/xsize"),
 512                    fgGetInt("/sim/startup/ysize") );
 513
 514         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 515             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 516             cloud3d_imposter_state->force();
 517             glDisable( GL_FOG );
 518             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 519             glEnable(GL_DEPTH_TEST);
 520             glEnable(GL_BLEND);
 521             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 522
 523 #ifdef FG_USE_CLOUDS_3D
 524             if ( _bcloud_orig ) {
 525                 Point3D c = globals->get_scenery()->get_center();
 526                 sgClouds3d->Set_Cloud_Orig( &c );
 527                 _bcloud_orig = false;
 528             }
 529             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 530 #endif
 531             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 532             glDisable(GL_DEPTH_TEST);
 533         }
 534
 535         clear_mask = GL_DEPTH_BUFFER_BIT;
 536         if ( fgGetBool("/sim/rendering/wireframe") ) {
 537             clear_mask |= GL_COLOR_BUFFER_BIT;
 538         }
 539
 540         if ( fgGetBool("/sim/rendering/skyblend") ) {
 541             if ( fgGetBool("/sim/rendering/textures") ) {
 542             // glClearColor(black[0], black[1], black[2], black[3]);
 543             glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 544                          l->adj_fog_color[2], l->adj_fog_color[3]);
 545             clear_mask |= GL_COLOR_BUFFER_BIT;
 546             }
 547         } else {
 548             glClearColor(l->sky_color[0], l->sky_color[1],
 549                      l->sky_color[2], l->sky_color[3]);
 550             clear_mask |= GL_COLOR_BUFFER_BIT;
 551         }
 552         glClear( clear_mask );
 553
 554         // Tell GL we are switching to model view parameters
 555
 556         // I really should create a derived ssg node or use a call
 557         // back or something so that I can draw the sky within the
 558         // ssgCullAndDraw() function, but for now I just mimic what
 559         // ssg does to set up the model view matrix
 560         glMatrixMode(GL_MODELVIEW);
 561         glLoadIdentity();
 562         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 563
 564         // set the opengl state to known default values
 565         default_state->force();
 566
 567         // update fog params if visibility has changed
 568         double visibility_meters = fgGetDouble("/environment/visibility-m");
 569         thesky->set_visibility(visibility_meters);
 570
 571         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 572                         ( global_multi_loop * fgGetInt("/sim/speed-up") )
 573                             / (double)fgGetInt("/sim/model-hz") );
 574
 575         // Set correct opengl fog density
 576         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 577
 578         // update the sky dome
 579         if ( fgGetBool("/sim/rendering/skyblend") ) {
 580             /*
 581              SG_LOG( SG_GENERAL, SG_BULK, "thesky->repaint() sky_color = "
 582              << cur_light_params.sky_color[0] << " "
 583              << cur_light_params.sky_color[1] << " "
 584              << cur_light_params.sky_color[2] << " "
 585              << cur_light_params.sky_color[3] );
 586             SG_LOG( SG_GENERAL, SG_BULK, "    fog = "
 587              << cur_light_params.fog_color[0] << " "
 588              << cur_light_params.fog_color[1] << " "
 589              << cur_light_params.fog_color[2] << " "
 590              << cur_light_params.fog_color[3] );
 591             SG_LOG( SG_GENERAL, SG_BULK,
 592                     "    sun_angle = " << cur_light_params.sun_angle
 593              << "    moon_angle = " << cur_light_params.moon_angle );
 594             */
 595             thesky->repaint( cur_light_params.sky_color,
 596                              cur_light_params.adj_fog_color,
 597                              cur_light_params.sun_angle,
 598                              cur_light_params.moon_angle,
 599                              globals->get_ephem()->getNumPlanets(),
 600                              globals->get_ephem()->getPlanets(),
 601                              globals->get_ephem()->getNumStars(),
 602                              globals->get_ephem()->getStars() );
 603
 604             /*
 605             SG_LOG( SG_GENERAL, SG_BULK,
 606                     "thesky->reposition( view_pos = " << view_pos[0] << " "
 607              << view_pos[1] << " " << view_pos[2] );
 608             SG_LOG( SG_GENERAL, SG_BULK,
 609                     "    zero_elev = " << zero_elev[0] << " "
 610              << zero_elev[1] << " " << zero_elev[2]
 611              << " lon = " << cur_fdm_state->get_Longitude()
 612              << " lat = " << cur_fdm_state->get_Latitude() );
 613             SG_LOG( SG_GENERAL, SG_BULK,
 614                     "    sun_rot = " << cur_light_params.sun_rotation
 615              << " gst = " << SGTime::cur_time_params->getGst() );
 616             SG_LOG( SG_GENERAL, SG_BULK,
 617                  "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 618               << " sun dec = " << globals->get_ephem()->getSunDeclination()
 619               << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 620               << " moon dec = " << globals->get_ephem()->getMoonDeclination() );
 621             */
 622
 623             thesky->reposition( current__view->get_view_pos(),
 624                             current__view->get_zero_elev(),
 625                             current__view->get_world_up(),
 626                             current__view->getLongitude_deg()
 627                                * SGD_DEGREES_TO_RADIANS,
 628                             current__view->getLatitude_deg()
 629                                * SGD_DEGREES_TO_RADIANS,
 630                             current__view->getAltitudeASL_ft()
 631                                * SG_FEET_TO_METER,
 632                             cur_light_params.sun_rotation,
 633                             globals->get_time_params()->getGst(),
 634                             globals->get_ephem()->getSunRightAscension(),
 635                             globals->get_ephem()->getSunDeclination(),
 636                             50000.0,
 637                             globals->get_ephem()->getMoonRightAscension(),
 638                             globals->get_ephem()->getMoonDeclination(),
 639                             50000.0 );
 640         }
 641
 642         glEnable( GL_DEPTH_TEST );
 643         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 644             glEnable( GL_FOG );
 645             glFogi( GL_FOG_MODE, GL_EXP2 );
 646             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 647         }
 648
 649         // set sun/lighting parameters
 650         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 651
 652         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 653         // we only update GL_AMBIENT for our lights we will never get
 654         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 655         // explicitely to black.
 656         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 657
 658         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 659         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 660         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 661
 662         // texture parameters
 663         // glEnable( GL_TEXTURE_2D );
 664         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 665         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 666
 667         // glMatrixMode( GL_PROJECTION );
 668         // glLoadIdentity();
 669         ssgSetFOV( current__view->get_h_fov(),
 670                    current__view->get_v_fov() );
 671
 672         double agl =
 673             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 674             - globals->get_scenery()->get_cur_elev();
 675
 676         if ( agl > 10.0 ) {
 677             scene_nearplane = 10.0f;
 678             scene_farplane = 120000.0f;
 679         } else {
 680             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 681             scene_farplane = 120000.0f;
 682         }
 683
 684         ssgSetNearFar( scene_nearplane, scene_farplane );
 685
 686         // $$$ begin - added VS Renganthan 17 Oct 2K
 687         if(objc)
 688           fgUpdateDCS();
 689         // $$$ end - added VS Renganthan 17 Oct 2K
 690
 691 # ifdef FG_NETWORK_OLK
 692         if ( fgGetBool("/sim/networking/network-olk") ) {
 693             sgCoord fgdpos;
 694             other = head->next;             /* put listpointer to start  */
 695             while ( other != tail) {        /* display all except myself */
 696             if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 697                 other->fgd_sel->select(1);
 698                 sgSetCoord( &fgdpos, other->sgFGD_COORD );
 699                 other->fgd_pos->setTransform( &fgdpos );
 700             }
 701             other = other->next;
 702             }
 703
 704             // fgd_sel->select(1);
 705             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 706             // sgCoord fgdpos;
 707             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 708             // fgd_pos->setTransform( &fgdpos);
 709         }
 710 # endif
 711
 712 #ifdef FG_MPLAYER_AS
 713         // Update any multiplayer models
 714         globals->get_multiplayer_rx_mgr()->Update();
 715 #endif
 716
 717         if ( fgGetBool("/sim/rendering/skyblend") &&
 718              fgGetBool("/sim/rendering/draw-otw") )
 719         {
 720             // draw the sky backdrop
 721
 722             // we need a white diffuse light for the phase of the moon
 723             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 724
 725             thesky->preDraw();
 726
 727             // return to the desired diffuse color
 728             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 729         }
 730
 731         // draw the ssg scene
 732         glEnable( GL_DEPTH_TEST );
 733
 734         ssgSetNearFar( scene_nearplane, scene_farplane );
 735
 736         if ( fgGetBool("/sim/rendering/wireframe") ) {
 737             // draw wire frame
 738             glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 739         }
 740         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 741             ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 742         }
 743
 744         // This is a bit kludgy.  Every 200 frames, do an extra
 745         // traversal of the scene graph without drawing anything, but
 746         // with the field-of-view set to 360x360 degrees.  This
 747         // ensures that out-of-range random objects that are not in
 748         // the current view frustum will still be freed properly.
 749         static int counter = 0;
 750         counter++;
 751         if (counter == 200) {
 752           sgFrustum f;
 753           f.setFOV(360, 360);
 754                             // No need to put the near plane too close;
 755                             // this way, at least the aircraft can be
 756                             // culled.
 757           f.setNearFar(1000, 1000000);
 758           sgMat4 m;
 759           ssgGetModelviewMatrix(m);
 760           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 761           counter = 0;
 762         }
 763
 764         // change state for lighting here
 765
 766         // draw runway lighting
 767         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 768         ssgSetNearFar( scene_nearplane, scene_farplane );
 769
 770 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 771         // Enable states for drawing points with GL_extension
 772         glEnable(GL_POINT_SMOOTH);
 773
 774         if ( fgGetBool("/sim/rendering/distance-attenuation")
 775              && glutExtensionSupported("GL_EXT_point_parameters") )
 776         {
 777             float quadratic[3] = {1.0, 0.001, 0.0000001};
 778             // makes the points fade as they move away
 779             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 780             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 781         }
 782         glPointSize(4.0);
 783
 784         // blending function for runway lights
 785         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 786 #endif
 787
 788         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 789         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 790         glEnable(GL_TEXTURE_GEN_S);
 791         glEnable(GL_TEXTURE_GEN_T);
 792         glPolygonMode(GL_FRONT, GL_POINT);
 793
 794         // draw runway lighting
 795         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 796             ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 797         }
 798
 799         // change punch through and then draw taxi lighting
 800         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 801         // sgVec3 taxi_fog;
 802         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 803         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 804         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 805             ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 806         }
 807
 808         // clean up lighting
 809         glPolygonMode(GL_FRONT, GL_FILL);
 810         glDisable(GL_TEXTURE_GEN_S);
 811         glDisable(GL_TEXTURE_GEN_T);
 812
 813         //static int _frame_count = 0;
 814         //if (_frame_count % 30 == 0) {
 815         //  printf("SSG: %s\n", ssgShowStats());
 816         //}
 817         //else {
 818         //  ssgShowStats();
 819         //}
 820         //_frame_count++;
 821
 822
 823 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 824         if ( fgGetBool("/sim/rendering/distance-attenuation")
 825              && glutExtensionSupported("GL_EXT_point_parameters") )
 826         {
 827             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 828                                   default_attenuation);
 829         }
 830
 831         glPointSize(1.0);
 832         glDisable(GL_POINT_SMOOTH);
 833 #endif
 834
 835         // draw ground lighting
 836         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 837         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 838             ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 839         }
 840
 841         if ( fgGetBool("/sim/rendering/skyblend") ) {
 842             // draw the sky cloud layers
 843             if ( fgGetBool("/environment/clouds/status") &&
 844                  fgGetBool("/sim/rendering/draw-otw") )
 845             {
 846                 thesky->postDraw( cur_fdm_state->get_Altitude()
 847                                   * SG_FEET_TO_METER );
 848             }
 849         }
 850
 851         if ( fgGetBool("/sim/rendering/clouds3d") &&
 852              fgGetBool("/sim/rendering/draw-otw") )
 853         {
 854             glDisable( GL_FOG );
 855             glDisable( GL_LIGHTING );
 856             // cout << "drawing new clouds" << endl;
 857
 858             glEnable(GL_DEPTH_TEST);
 859             glEnable(GL_BLEND);
 860             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 861
 862             /*
 863             glEnable( GL_TEXTURE_2D );
 864             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 865             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 866             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 867             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 868             */
 869
 870 #ifdef FG_USE_CLOUDS_3D
 871             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 872 #endif
 873             glEnable( GL_FOG );
 874             glEnable( GL_LIGHTING );
 875             glEnable( GL_DEPTH_TEST );
 876             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 877         }
 878
 879         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 880             globals->get_model_mgr()->draw();
 881             globals->get_aircraft_model()->draw();
 882         }
 883
 884         // display HUD && Panel
 885         glDisable( GL_FOG );
 886         glDisable( GL_DEPTH_TEST );
 887         // glDisable( GL_CULL_FACE );
 888         // glDisable( GL_TEXTURE_2D );
 889
 890         // update the controls subsystem
 891         globals->get_controls()->update(delta_time_sec);
 892
 893         hud_and_panel->apply();
 894         fgCockpitUpdate();
 895
 896         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 897         // This only works properly if called before the panel call
 898         if((fgGetBool("/sim/ATC/enabled")) || (fgGetBool("/sim/ai-traffic/enabled")))
 899             globals->get_ATC_display()->update(delta_time_sec);
 900
 901         // update the panel subsystem
 902         if ( globals->get_current_panel() != NULL ) {
 903             globals->get_current_panel()->update(delta_time_sec);
 904         }
 905         fgUpdate3DPanels();
 906
 907         // We can do translucent menus, so why not. :-)
 908         menus->apply();
 909         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 910         puDisplay();
 911         // glDisable ( GL_BLEND ) ;
 912
 913         glEnable( GL_DEPTH_TEST );
 914         glEnable( GL_FOG );
 915
 916         // Fade out the splash screen over the first three seconds.
 917         double t = globals->get_sim_time_sec();
 918         if ( t <= 1.0 ) {
 919             fgSplashUpdate(0.0, 1.0);
 920         } else if ( t <= 3.0) {
 921             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 922         }
 923     }
 924
 925     glutSwapBuffers();
 926 }
 927
 928
 929 // Update internal time dependent calculations (i.e. flight model)
 930 // FIXME: this distinction is obsolete; all subsystems now get delta
 931 // time on update.
 932 void fgUpdateTimeDepCalcs() {
 933     static bool inited = false;
 934
 935     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 936
 937     fgLIGHT *l = &cur_light_params;
 938
 939     // Initialize the FDM here if it hasn't been and if we have a
 940     // scenery elevation hit.
 941
 942     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 943     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 944
 945     if ( !cur_fdm_state->get_inited() &&
 946          globals->get_scenery()->get_cur_elev() > -9990 )
 947     {
 948         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 949         cur_fdm_state->init();
 950         if ( cur_fdm_state->get_bound() ) {
 951             cur_fdm_state->unbind();
 952         }
 953         cur_fdm_state->bind();
 954     }
 955
 956 #ifndef FG_WEATHERCM
 957     globals->get_environment_mgr()->update(delta_time_sec);
 958 #endif
 959
 960     // conceptually, the following block could be done for each fdm
 961     // instance ...
 962     if ( !cur_fdm_state->get_inited() ) {
 963         // do nothing, fdm isn't inited yet
 964     } else {
 965         // we have been inited, and  we are good to go ...
 966
 967         if ( !inited ) {
 968             inited = true;
 969         }
 970
 971         globals->get_autopilot()->update(delta_time_sec);
 972         cur_fdm_state->update(delta_time_sec);
 973     }
 974
 975     globals->get_model_mgr()->update(delta_time_sec);
 976     globals->get_aircraft_model()->update(delta_time_sec);
 977
 978     // update the view angle
 979     globals->get_viewmgr()->update(delta_time_sec);
 980
 981     l->UpdateAdjFog();
 982
 983     // Update solar system
 984     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 985                               globals->get_time_params()->getLst(),
 986                               cur_fdm_state->get_Latitude() );
 987
 988     // Update radio stack model
 989     current_radiostack->update(delta_time_sec);
 990 }
 991
 992
 993 void fgInitTimeDepCalcs( void ) {
 994     // noop for now
 995 }
 996
 997
 998 static const double alt_adjust_ft = 3.758099;
 999 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
1000
1001
1002 // What should we do when we have nothing else to do?  Let's get ready
1003 // for the next move and update the display?
1004 static void fgMainLoop( void ) {
1005
1006     static const SGPropertyNode *longitude
1007         = fgGetNode("/position/longitude-deg");
1008     static const SGPropertyNode *latitude
1009         = fgGetNode("/position/latitude-deg");
1010     static const SGPropertyNode *altitude
1011         = fgGetNode("/position/altitude-ft");
1012     static const SGPropertyNode *clock_freeze
1013         = fgGetNode("/sim/freeze/clock", true);
1014     static const SGPropertyNode *cur_time_override
1015         = fgGetNode("/sim/time/cur-time-override", true);
1016
1017     // Update the elapsed time.
1018     static bool first_time = true;
1019     if ( first_time ) {
1020         last_time_stamp.stamp();
1021         first_time = false;
1022     }
1023     current_time_stamp.stamp();
1024     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
1025     if (clock_freeze->getBoolValue())
1026         delta_time_sec = 0;
1027     last_time_stamp = current_time_stamp;
1028     globals->inc_sim_time_sec( delta_time_sec );
1029     Animation::set_sim_time_sec( globals->get_sim_time_sec() );
1030
1031     static long remainder = 0;
1032     long elapsed;
1033 #ifdef FANCY_FRAME_COUNTER
1034     int i;
1035     double accum;
1036 #else
1037     static time_t last_time = 0;
1038     static int frames = 0;
1039 #endif // FANCY_FRAME_COUNTER
1040
1041     SGTime *t = globals->get_time_params();
1042
1043     sglog().setLogLevels( SG_ALL, (sgDebugPriority)fgGetInt("/sim/log-level") );
1044     sglog().setLogLevels( SG_ALL, SG_INFO );
1045
1046     FGLocation * acmodel_location = 0;
1047     if(cur_fdm_state->getACModel() != 0) {
1048       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
1049     }
1050
1051     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
1052     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
1053
1054 #ifdef FG_NETWORK_OLK
1055     if ( fgGetBool("/sim/networking/network-olk") ) {
1056         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
1057             // printf("FGD: Netupdate\n");
1058             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
1059             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
1060         }
1061     }
1062 #endif
1063
1064 #if defined( ENABLE_PLIB_JOYSTICK )
1065     // Read joystick and update control settings
1066     // if ( fgGetString("/sim/control-mode") == "joystick" )
1067     // {
1068     //    fgJoystickRead();
1069     // }
1070 #elif defined( ENABLE_GLUT_JOYSTICK )
1071     // Glut joystick support works by feeding a joystick handler
1072     // function to glut.  This is taken care of once in the joystick
1073     // init routine and we don't have to worry about it again.
1074 #endif
1075
1076     // Fix elevation.  I'm just sticking this here for now, it should
1077     // probably move eventually
1078
1079     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
1080            scenery.get_cur_elev(),
1081            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1082            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1083
1084 // Curt is this code used?  I don't see any problems when I comment it out.
1085     if ( acmodel_location != 0 ) {
1086       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
1087         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
1088              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
1089             // now set aircraft altitude above ground
1090             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
1091                cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
1092                acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
1093                acmodel_location->get_cur_elev_m() + alt_adjust_m );
1094             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
1095                                                 + alt_adjust_m) * SG_METER_TO_FEET );
1096             SG_LOG( SG_ALL, SG_DEBUG,
1097                 "<*> resetting altitude to "
1098                 << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
1099                 << " meters" );
1100         }
1101       }
1102     }
1103 // End of code in question. (see Curt is this code used? above)
1104
1105     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
1106            scenery.get_cur_elev(),
1107            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1108            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1109
1110     // cout << "Warp = " << globals->get_warp() << endl;
1111
1112     // update "time"
1113     static bool last_clock_freeze = false;
1114
1115     if ( clock_freeze->getBoolValue() ) {
1116         // clock freeze requested
1117         if ( cur_time_override->getLongValue() == 0 ) {
1118             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
1119             globals->set_warp( 0 );
1120         }
1121     } else {
1122         // no clock freeze requested
1123         if ( last_clock_freeze == true ) {
1124             // clock just unfroze, let's set warp as the difference
1125             // between frozen time and current time so we don't get a
1126             // time jump (and corresponding sky object and lighting
1127             // jump.)
1128             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
1129             fgSetLong( "/sim/time/cur-time-override", 0 );
1130         }
1131         if ( globals->get_warp_delta() != 0 ) {
1132             globals->inc_warp( globals->get_warp_delta() );
1133         }
1134     }
1135
1136     last_clock_freeze = clock_freeze->getBoolValue();
1137
1138     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1139                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1140                cur_time_override->getLongValue(),
1141                globals->get_warp() );
1142
1143     if ( globals->get_warp_delta() != 0 ) {
1144         fgUpdateSkyAndLightingParams();
1145     }
1146
1147     // update magvar model
1148     globals->get_mag()->update( longitude->getDoubleValue()
1149                               * SGD_DEGREES_TO_RADIANS,
1150                             latitude->getDoubleValue()
1151                               * SGD_DEGREES_TO_RADIANS,
1152                             altitude->getDoubleValue() * SG_FEET_TO_METER,
1153                             globals->get_time_params()->getJD() );
1154
1155     // Get elapsed time (in usec) for this past frame
1156     elapsed = fgGetTimeInterval();
1157     SG_LOG( SG_ALL, SG_DEBUG,
1158             "Elapsed time interval is = " << elapsed
1159             << ", previous remainder is = " << remainder );
1160
1161     // Calculate frame rate average
1162 #ifdef FANCY_FRAME_COUNTER
1163     /* old fps calculation */
1164     if ( elapsed > 0 ) {
1165         double tmp;
1166         accum = 0.0;
1167         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1168             tmp = general.get_frame(i);
1169             accum += tmp;
1170             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1171             general.set_frame(i+1,tmp);
1172         }
1173         tmp = 1000000.0 / (float)elapsed;
1174         general.set_frame(0,tmp);
1175         // printf("frame[0] = %.2f\n", general.frames[0]);
1176         accum += tmp;
1177         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1178         // printf("ave = %.2f\n", general.frame_rate);
1179     }
1180 #else
1181     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1182         general.set_frame_rate( frames );
1183         fgSetInt("/sim/frame-rate", frames);
1184         SG_LOG( SG_ALL, SG_DEBUG,
1185             "--> Frame rate is = " << general.get_frame_rate() );
1186         frames = 0;
1187     }
1188     last_time = t->get_cur_time();
1189     ++frames;
1190 #endif
1191
1192     // Run ATC subsystem
1193     if (fgGetBool("/sim/ATC/enabled"))
1194         globals->get_ATC_mgr()->update(delta_time_sec);
1195
1196     // Run the AI subsystem
1197     if (fgGetBool("/sim/ai-traffic/enabled"))
1198         globals->get_AI_mgr()->update(delta_time_sec);
1199
1200     // Run flight model
1201
1202     // Calculate model iterations needed for next frame
1203     elapsed += remainder;
1204
1205     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1206                           fgGetInt("/sim/model-hz"));
1207     remainder = elapsed - ( (global_multi_loop*1000000) /
1208                         fgGetInt("/sim/model-hz") );
1209     SG_LOG( SG_ALL, SG_DEBUG,
1210             "Model iterations needed = " << global_multi_loop
1211             << ", new remainder = " << remainder );
1212
1213     // chop max interations to something reasonable if the sim was
1214     // delayed for an excesive amount of time
1215     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1216         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1217         remainder = 0;
1218     }
1219
1220     // flight model
1221     if ( global_multi_loop > 0 ) {
1222         fgUpdateTimeDepCalcs();
1223     } else {
1224         SG_LOG( SG_ALL, SG_DEBUG,
1225             "Elapsed time is zero ... we're zinging" );
1226     }
1227
1228     // Do any I/O channel work that might need to be done
1229     globals->get_io()->update( delta_time_sec );
1230
1231     // see if we need to load any deferred-load textures
1232     material_lib.load_next_deferred();
1233
1234     // Run audio scheduler
1235 #ifdef ENABLE_AUDIO_SUPPORT
1236     if ( fgGetBool("/sim/sound/audible")
1237            && globals->get_soundmgr()->is_working() ) {
1238         globals->get_soundmgr()->update( delta_time_sec );
1239     }
1240 #endif
1241
1242     globals->get_subsystem_mgr()->update(delta_time_sec);
1243
1244     //
1245     // Tile Manager updates - see if we need to load any new scenery tiles.
1246     //   this code ties together the fdm, viewer and scenery classes...
1247     //   we may want to move this to it's own class at some point
1248     //
1249     double visibility_meters = fgGetDouble("/environment/visibility-m");
1250     FGViewer *current_view = globals->get_current_view();
1251
1252     // update tile manager for FDM...
1253     // ...only if location is different than the viewer (to avoid duplicating effort)
1254     if( acmodel_location != current_view->getFGLocation() ) {
1255       if( acmodel_location != 0 ) {
1256         globals->get_tile_mgr()->prep_ssg_nodes( acmodel_location,
1257                                                  visibility_meters );
1258         globals->get_tile_mgr()->
1259             update( acmodel_location, visibility_meters,
1260                     acmodel_location->get_absolute_view_pos(globals->get_scenery()->get_center()) );
1261         // save results of update in FGLocation for fdm...
1262         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1263           acmodel_location->
1264               set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1265         }
1266         acmodel_location->
1267             set_tile_center( globals->get_scenery()->get_next_center() );
1268       }
1269     }
1270
1271     globals->get_tile_mgr()->prep_ssg_nodes( current_view->getFGLocation(),
1272                                              visibility_meters );
1273     // update tile manager for view...
1274     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1275     // after the FDM's until all of Flight Gear code references the viewer's location
1276     // for elevation instead of the "scenery's" current elevation.
1277     FGLocation *view_location = globals->get_current_view()->getFGLocation();
1278     globals->get_tile_mgr()->update( view_location, visibility_meters,
1279                                      current_view->get_absolute_view_pos() );
1280     // save results of update in FGLocation for fdm...
1281     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1282       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1283     }
1284     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1285
1286     // If fdm location is same as viewer's then we didn't do the update for fdm location
1287     //   above so we need to save the viewer results in the fdm FGLocation as well...
1288     if( acmodel_location == current_view->getFGLocation() ) {
1289       if( acmodel_location != 0 ) {
1290         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1291           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1292         }
1293         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1294       }
1295     }
1296
1297     // END Tile Manager udpates
1298
1299     // redraw display
1300     fgRenderFrame();
1301
1302     SG_LOG( SG_ALL, SG_DEBUG, "" );
1303 }
1304
1305
1306 // This is the top level master main function that is registered as
1307 // our idle funciton
1308
1309 // The first few passes take care of initialization things (a couple
1310 // per pass) and once everything has been initialized fgMainLoop from
1311 // then on.
1312
1313 static void fgIdleFunction ( void ) {
1314     // printf("idle state == %d\n", idle_state);
1315
1316     if ( idle_state == 0 ) {
1317         // Initialize the splash screen right away
1318         if ( fgGetBool("/sim/startup/splash-screen") ) {
1319             fgSplashInit();
1320         }
1321
1322         idle_state++;
1323     } else if ( idle_state == 1 ) {
1324         // Initialize audio support
1325 #ifdef ENABLE_AUDIO_SUPPORT
1326
1327         // Start the intro music
1328         if ( fgGetBool("/sim/startup/intro-music") ) {
1329             SGPath mp3file( globals->get_fg_root() );
1330             mp3file.append( "Sounds/intro.mp3" );
1331
1332             SG_LOG( SG_GENERAL, SG_INFO,
1333                 "Starting intro music: " << mp3file.str() );
1334
1335 #if defined( __CYGWIN__ )
1336             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1337 #elif defined( WIN32 )
1338             string command = "start /m " + mp3file.str();
1339 #else
1340             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1341 #endif
1342
1343             system ( command.c_str() );
1344         }
1345 #endif
1346
1347         idle_state++;
1348     } else if ( idle_state == 2 ) {
1349         // These are a few miscellaneous things that aren't really
1350         // "subsystems" but still need to be initialized.
1351
1352 #ifdef USE_GLIDE
1353         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1354             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1355         }
1356 #endif
1357
1358         idle_state++;
1359     } else if ( idle_state == 3 ) {
1360         // This is the top level init routine which calls all the
1361         // other subsystem initialization routines.  If you are adding
1362         // a subsystem to flightgear, its initialization call should
1363         // located in this routine.
1364         if( !fgInitSubsystems()) {
1365             SG_LOG( SG_GENERAL, SG_ALERT,
1366                 "Subsystem initializations failed ..." );
1367             exit(-1);
1368         }
1369
1370         idle_state++;
1371     } else if ( idle_state == 4 ) {
1372         // setup OpenGL view parameters
1373         fgInitVisuals();
1374
1375         // Read the list of available aircrafts
1376         fgReadAircraft();
1377
1378         idle_state++;
1379     } else if ( idle_state == 5 ) {
1380
1381         idle_state++;
1382     } else if ( idle_state == 6 ) {
1383         // sleep(1);
1384         idle_state = 1000;
1385
1386         SG_LOG( SG_GENERAL, SG_INFO, "Panel visible = " << fgPanelVisible() );
1387         fgReshape( fgGetInt("/sim/startup/xsize"),
1388                fgGetInt("/sim/startup/ysize") );
1389     }
1390
1391     if ( idle_state == 1000 ) {
1392         // We've finished all our initialization steps, from now on we
1393         // run the main loop.
1394
1395         glutIdleFunc(fgMainLoop);
1396     } else {
1397         if ( fgGetBool("/sim/startup/splash-screen") ) {
1398             fgSplashUpdate(0.0, 1.0);
1399         }
1400     }
1401 }
1402
1403 // options.cxx needs to see this for toggle_panel()
1404 // Handle new window size or exposure
1405 void fgReshape( int width, int height ) {
1406     int view_h;
1407
1408     if ( (!fgGetBool("/sim/virtual-cockpit"))
1409          && fgPanelVisible() && idle_state == 1000 ) {
1410         view_h = (int)(height * (globals->get_current_panel()->getViewHeight() -
1411                              globals->get_current_panel()->getYOffset()) / 768.0);
1412     } else {
1413         view_h = height;
1414     }
1415
1416     // for all views
1417     FGViewMgr *viewmgr = globals->get_viewmgr();
1418     for ( int i = 0; i < viewmgr->size(); ++i ) {
1419       viewmgr->get_view(i)->
1420         set_aspect_ratio((float)view_h / (float)width);
1421     }
1422
1423     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1424
1425     fgSetInt("/sim/startup/xsize", width);
1426     fgSetInt("/sim/startup/ysize", height);
1427     guiInitMouse(width, height);
1428
1429     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1430                viewmgr->get_current_view()->get_v_fov() );
1431
1432     fgHUDReshape();
1433
1434 #ifdef FG_USE_CLOUDS_3D
1435     sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
1436                         viewmgr->get_current_view()->get_v_fov() );
1437 #endif
1438
1439 }
1440
1441 // Initialize GLUT and define a main window
1442 static bool fgGlutInit( int *argc, char **argv ) {
1443
1444 #if !defined( macintosh )
1445     // GLUT will extract all glut specific options so later on we only
1446     // need wory about our own.
1447     glutInit(argc, argv);
1448 #endif
1449
1450     // Define Display Parameters. Clouds3d works best with --bpp32 option
1451     if ( fgGetBool("/sim/rendering/clouds3d") ) {
1452         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_ALPHA );
1453     } else {
1454         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1455     }
1456
1457     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1458             fgGetInt("/sim/startup/xsize") << "x"
1459             << fgGetInt("/sim/startup/ysize") );
1460
1461     // Define initial window size
1462     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1463                     fgGetInt("/sim/startup/ysize") );
1464
1465     // Initialize windows
1466     if ( !fgGetBool("/sim/startup/game-mode")) {
1467         // Open the regular window
1468         glutCreateWindow("FlightGear");
1469 #ifndef GLUT_WRONG_VERSION
1470     } else {
1471         // Open the cool new 'game mode' window
1472         char game_mode_str[256];
1473 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1474 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1475 #ifndef ENUM_CURRENT_SETTINGS
1476 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1477 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1478 #endif
1479
1480         DEVMODE dm;
1481         dm.dmSize = sizeof(DEVMODE);
1482         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1483         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1484         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1485         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1486                             fgGetInt("/sim/startup/ysize") );
1487         sprintf( game_mode_str, "%dx%d:%d@%d",
1488                      dm.dmPelsWidth,
1489                      dm.dmPelsHeight,
1490                      dm.dmBitsPerPel,
1491                      dm.dmDisplayFrequency );
1492 #else
1493         // Open the cool new 'game mode' window
1494         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1495              fgGetInt("/sim/startup/xsize"),
1496              fgGetInt("/sim/startup/ysize"),
1497              fgGetInt("/sim/rendering/bits-per-pixel"));
1498
1499 #endif // HAVE_WINDOWS_H
1500         SG_LOG( SG_GENERAL, SG_INFO,
1501             "game mode params = " << game_mode_str );
1502         glutGameModeString( game_mode_str );
1503         glutEnterGameMode();
1504 #endif // GLUT_WRONG_VERSION
1505     }
1506
1507     // This seems to be the absolute earliest in the init sequence
1508     // that these calls will return valid info.  Too bad it's after
1509     // we've already created and sized out window. :-(
1510     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1511     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1512     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1513     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1514
1515     GLint tmp;
1516     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1517     general.set_glMaxTexSize( tmp );
1518     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1519
1520     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1521     general.set_glDepthBits( tmp );
1522     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1523
1524     return true;
1525 }
1526
1527
1528 // Initialize GLUT event handlers
1529 static bool fgGlutInitEvents( void ) {
1530     // call fgReshape() on window resizes
1531     glutReshapeFunc( fgReshape );
1532
1533     // keyboard and mouse callbacks are set in FGInput::init
1534
1535     // call fgMainLoop() whenever there is
1536     // nothing else to do
1537     glutIdleFunc( fgIdleFunction );
1538
1539     // draw the scene
1540     glutDisplayFunc( fgRenderFrame );
1541
1542     return true;
1543 }
1544
1545 // Main top level initialization
1546 static bool fgMainInit( int argc, char **argv ) {
1547
1548 #if defined( macintosh )
1549     freopen ("stdout.txt", "w", stdout );
1550     freopen ("stderr.txt", "w", stderr );
1551     argc = ccommand( &argv );
1552 #endif
1553
1554     // set default log levels
1555     sglog().setLogLevels( SG_ALL, SG_INFO );
1556
1557     string version;
1558 #ifdef FLIGHTGEAR_VERSION
1559     version = FLIGHTGEAR_VERSION;
1560 #else
1561     version = "unknown version";
1562 #endif
1563     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1564             << version );
1565     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1566
1567     // Allocate global data structures.  This needs to happen before
1568     // we parse command line options
1569
1570     globals = new FGGlobals;
1571
1572 #ifndef FG_WEATHERCM
1573     globals->set_environment_mgr(new FGEnvironmentMgr);
1574 #endif
1575
1576     // seed the random number generater
1577     sg_srandom_time();
1578
1579     SGRoute *route = new SGRoute;
1580     globals->set_route( route );
1581
1582     FGControls *controls = new FGControls;
1583     globals->set_controls( controls );
1584
1585     string_list *col = new string_list;
1586     globals->set_channel_options_list( col );
1587
1588     // Scan the config file(s) and command line options to see if
1589     // fg_root was specified (ignore all other options for now)
1590     fgInitFGRoot(argc, argv);
1591
1592     // Check for the correct base package version
1593     static char required_version[] = "0.9.1";
1594     string base_version = fgBasePackageVersion();
1595     if ( !(base_version == required_version) ) {
1596         // tell the operator how to use this application
1597
1598         cerr << endl << "Base package check failed ... " \
1599              << "Found version " << base_version << " at: " \
1600              << globals->get_fg_root() << endl;
1601         cerr << "Please upgrade to version: " << required_version << endl;
1602         exit(-1);
1603     }
1604
1605     // Initialize the Aircraft directory to "" (UIUC)
1606     aircraft_dir = "";
1607
1608     // Load the configuration parameters.  (Command line options
1609     // overrides config file options.  Config file options override
1610     // defaults.)
1611     if ( !fgInitConfig(argc, argv) ) {
1612         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1613         exit(-1);
1614     }
1615
1616     // Initialize the Window/Graphics environment.
1617     if( !fgGlutInit(&argc, argv) ) {
1618         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1619         exit(-1);
1620     }
1621
1622     // Initialize the various GLUT Event Handlers.
1623     if( !fgGlutInitEvents() ) {
1624  SG_LOG( SG_GENERAL, SG_ALERT,
1625                 "GLUT event handler initialization failed ..." );
1626         exit(-1);
1627     }
1628
1629     // Initialize plib net interface
1630     netInit( &argc, argv );
1631
1632     // Initialize ssg (from plib).  Needs to come before we do any
1633     // other ssg stuff, but after opengl/glut has been initialized.
1634     ssgInit();
1635
1636     // Initialize the user interface (we need to do this before
1637     // passing off control to glut and before fgInitGeneral to get our
1638     // fonts !!!
1639     guiInit();
1640
1641     // Read the list of available aircrafts
1642     fgReadAircraft();
1643
1644 #ifdef GL_EXT_texture_lod_bias
1645     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1646 #endif
1647
1648 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
1649             // get the address of our OpenGL extensions
1650     if ( fgGetBool("/sim/rendering/distance-attenuation") )
1651     {
1652 #ifdef WIN32
1653         glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
1654             wglGetProcAddress("glPointParameterfEXT");
1655         glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
1656             wglGetProcAddress("glPointParameterfvEXT");
1657 #elif linux
1658         glPointParameterfEXT = (OpenGLFuncExt)
1659             glXGetProcAddressARB((GLubyte *)"glPointParameterfEXT");
1660         glPointParameterfvEXT = (OpenGLFuncExtv)
1661             glXGetProcAddressARB((GLubyte *)"glPointParameterfvEXT");
1662 #endif
1663    }
1664 #endif
1665
1666     // based on the requested presets, calculate the true starting
1667     // lon, lat
1668     fgInitNav();
1669     fgInitPosition();
1670
1671     SGTime *t = fgInitTime();
1672     globals->set_time_params( t );
1673
1674     // Do some quick general initializations
1675     if( !fgInitGeneral()) {
1676         SG_LOG( SG_GENERAL, SG_ALERT,
1677             "General initializations failed ..." );
1678         exit(-1);
1679     }
1680
1681     SGPath modelpath( globals->get_fg_root() );
1682     ssgModelPath( (char *)modelpath.c_str() );
1683
1684     // Initialize the global scenery manager
1685     globals->set_scenery( new FGScenery );
1686     globals->get_scenery()->init();
1687     globals->get_scenery()->bind();
1688
1689     // Initialize the global tile manager
1690     globals->set_tile_mgr( new FGTileMgr );
1691
1692     ////////////////////////////////////////////////////////////////////
1693     // Initialize the property-based built-in commands
1694     ////////////////////////////////////////////////////////////////////
1695     fgInitCommands();
1696
1697     ////////////////////////////////////////////////////////////////////
1698     // Initialize the general model subsystem.
1699     ////////////////////////////////////////////////////////////////////
1700
1701     globals->set_model_loader(new FGModelLoader);
1702     globals->set_model_mgr(new FGModelMgr);
1703     globals->get_model_mgr()->init();
1704     globals->get_model_mgr()->bind();
1705
1706     ////////////////////////////////////////////////////////////////////
1707     // Initialize the 3D aircraft model subsystem.
1708     ////////////////////////////////////////////////////////////////////
1709
1710     globals->set_aircraft_model(new FGAircraftModel);
1711     globals->get_aircraft_model()->init();
1712     globals->get_aircraft_model()->bind();
1713
1714     ////////////////////////////////////////////////////////////////////
1715     // Initialize the view manager subsystem.
1716     ////////////////////////////////////////////////////////////////////
1717
1718     FGViewMgr *viewmgr = new FGViewMgr;
1719     globals->set_viewmgr( viewmgr );
1720     viewmgr->init();
1721     viewmgr->bind();
1722
1723
1724     // Initialize the sky
1725     SGPath ephem_data_path( globals->get_fg_root() );
1726     ephem_data_path.append( "Astro" );
1727     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1728     ephem->update( globals->get_time_params()->getMjd(),
1729                globals->get_time_params()->getLst(),
1730                0.0 );
1731     globals->set_ephem( ephem );
1732
1733                             // TODO: move to environment mgr
1734     thesky = new SGSky;
1735     SGPath texture_path(globals->get_fg_root());
1736     texture_path.append("Textures");
1737     texture_path.append("Sky");
1738     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1739         SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1740         thesky->add_cloud_layer(layer);
1741     }
1742
1743
1744     SGPath sky_tex_path( globals->get_fg_root() );
1745     sky_tex_path.append( "Textures" );
1746     sky_tex_path.append( "Sky" );
1747     thesky->texture_path( sky_tex_path.str() );
1748
1749     thesky->build( 550.0, 550.0,
1750                globals->get_ephem()->getNumPlanets(),
1751                globals->get_ephem()->getPlanets(), 60000.0,
1752                globals->get_ephem()->getNumStars(),
1753                globals->get_ephem()->getStars(), 60000.0 );
1754
1755     // Initialize MagVar model
1756     SGMagVar *magvar = new SGMagVar();
1757     globals->set_mag( magvar );
1758
1759     // airport = new ssgBranch;
1760     // airport->setName( "Airport Lighting" );
1761     // lighting->addKid( airport );
1762
1763     // ADA
1764     fgLoadDCS();
1765     // ADA
1766
1767 #ifdef FG_NETWORK_OLK
1768     // Do the network intialization
1769     if ( fgGetBool("/sim/networking/network-olk") ) {
1770         printf("Multipilot mode %s\n",
1771                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1772     }
1773 #endif
1774
1775     // build our custom render states
1776     fgBuildRenderStates();
1777
1778     // pass control off to the master GLUT event handler
1779     glutMainLoop();
1780
1781     // we never actually get here ... but to avoid compiler warnings,
1782     // etc.
1783     return false;
1784 }
1785
1786
1787 // $$$ end - added VS Renganathan, 15 Oct 2K
1788 //         - added Venky         , 12 Nov 2K
1789
1790 #if defined(__linux__) && defined(__i386__)
1791
1792 static void handleFPE (int);
1793
1794 static void
1795 initFPE ()
1796 {
1797     fpu_control_t fpe_flags = 0;
1798     _FPU_GETCW(fpe_flags);
1799 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1800 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1801 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1802 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1803 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1804 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1805     _FPU_SETCW(fpe_flags);
1806     signal(SIGFPE, handleFPE);
1807 }
1808
1809 static void
1810 handleFPE (int num)
1811 {
1812   initFPE();
1813   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1814 }
1815 #endif
1816
1817 #ifdef __APPLE__
1818
1819 typedef struct
1820 {
1821   int  lo;
1822   int  hi;
1823 } PSN;
1824
1825 extern "C" {
1826   short CPSGetCurrentProcess(PSN *psn);
1827   short CPSSetProcessName (PSN *psn, char *processname);
1828   short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
1829   short CPSSetFrontProcess(PSN *psn);
1830 };
1831
1832 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
1833
1834 #endif
1835
1836 // Main entry point; catch any exceptions that have made it this far.
1837 int main ( int argc, char **argv ) {
1838
1839     // Enable floating-point exceptions for Linux/x86
1840 #if defined(__linux__) && defined(__i386__)
1841     initFPE();
1842 #endif
1843
1844     // Enable floating-point exceptions for Windows
1845 #if defined( _MSC_VER ) && defined( DEBUG )
1846     // Christian, we should document what this does
1847     _control87( _EM_INEXACT, _MCW_EM );
1848 #endif
1849
1850 #if defined( HAVE_BC5PLUS )
1851     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1852 #endif
1853
1854     // Keyboard focus hack
1855 #ifdef __APPLE__
1856     {
1857       PSN psn;
1858
1859       glutInit (&argc, argv);
1860
1861       CPSGetCurrentProcess(&psn);
1862       CPSSetProcessName(&psn, "FlightGear");
1863       CPSEnableFG(&psn);
1864       CPSSetFrontProcess(&psn);
1865     }
1866 #endif
1867
1868     // FIXME: add other, more specific
1869     // exceptions.
1870     try {
1871         fgMainInit(argc, argv);
1872     } catch (sg_throwable &t) {
1873                             // We must use cerr rather than
1874                             // logging, since logging may be
1875                             // disabled.
1876         cerr << "Fatal error: " << t.getFormattedMessage()
1877              << "\n (received from " << t.getOrigin() << ')' << endl;
1878         exit(1);
1879     }
1880
1881     return 0;
1882 }
1883
1884
1885 void fgLoadDCS(void) {
1886
1887     ssgEntity *ship_obj = NULL;
1888
1889     char obj_filename[25];
1890
1891     for ( int k = 0; k < 32; k++ ) {
1892         ship_pos[k]=NULL;
1893     }
1894
1895     SGPath tile_path( globals->get_fg_root());
1896     tile_path.append( "Scenery" );
1897     tile_path.append( "Objects.txt" );
1898     sg_gzifstream in( tile_path.str() );
1899     if ( ! in.is_open() ) {
1900         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1901     } else {
1902
1903         SGPath modelpath( globals->get_fg_root() );
1904         modelpath.append( "Models" );
1905         modelpath.append( "Geometry" );
1906
1907         SGPath texturepath( globals->get_fg_root() );
1908         texturepath.append( "Models" );
1909         texturepath.append( "Textures" );
1910
1911         ssgModelPath( (char *)modelpath.c_str() );
1912         ssgTexturePath( (char *)texturepath.c_str() );
1913
1914         ship_sel = new ssgSelector;
1915
1916         char c;
1917         while ( ! in.eof() ) {
1918             in >> ::skipws;
1919             if ( in.get( c ) && c == '#' ) {
1920                 in >> skipeol;
1921             } else {
1922                 in.putback(c);
1923                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1924                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1925                    int chj=getchar();*/
1926
1927                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1928                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1929
1930                 ship_pos[objc] = new ssgTransform;
1931
1932                 // type "repeat" in objects.txt to load one more
1933                 // instance of the last object.
1934
1935                 if ( strcmp(obj_filename,"repeat") != 0) {
1936                     ship_obj =
1937                       globals->get_model_loader()->load_model( globals->get_fg_root(), obj_filename, globals->get_props(), globals->get_sim_time_sec() );
1938                 }
1939
1940                 if ( ship_obj != NULL ) {
1941                                 ship_obj->setName(obj_filename);
1942                             if (objc == 0)
1943                                         ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1944                                 else
1945                                         ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1946                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1947                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1948                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1949                             << obj_filename );
1950                 } else {
1951                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1952                             << obj_filename );
1953                 }
1954
1955                             // temporary hack for deck lights - ultimately should move to PLib (when??)
1956                             //const char *extn = file_extension ( obj_filename ) ;
1957                             if ( objc == 1 ){
1958                                 // ssgVertexArray *lights = new ssgVertexArray( 100 );
1959                                 ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1960                                 ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1961                                 ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1962                                 int ltype[500], light_type = 0;
1963                                 static int ltcount = 0;
1964                                 string token;
1965                                 sgVec3 rway_dir,rway_normal,lightpt;
1966                                 Point3D node;
1967                                 modelpath.append(obj_filename);
1968                                 sg_gzifstream in1( modelpath.str() );
1969                                 if ( ! in1.is_open() ) {
1970                                         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1971                                 } else {
1972                                         while ( ! in1.eof() ) {
1973                                                         in1 >> ::skipws;
1974                                                 if ( in1.get( c ) && c == '#' ) {
1975                                                         in1 >> skipeol;
1976                                                 } else {
1977                                                         in1.putback(c);
1978                                                         in1 >> token;
1979                                                         //cout << token << endl;
1980                                                         if ( token == "runway" ) {
1981                                                                 in1 >> node;
1982                                                                 sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1983                                                         } else if ( token == "edgelight" ) {
1984                                                                 in1 >> node;
1985                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1986                                                                 light_type = 1;
1987                                                         } else if ( token == "taxi" ) {
1988                                                                 in1 >> node;
1989                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1990                                                                 light_type = 2;
1991                                                         } else if ( token == "vasi" ) {
1992                                                                 in1 >> node;
1993                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1994                                                                 light_type = 3;
1995                                                         } else if ( token == "threshold" ) {
1996                                                                 in1 >> node;
1997                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1998                                                                 light_type = 4;
1999                                                         } else if ( token == "rabbit" ) {
2000                                                                 in1 >> node;
2001                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2002                                                                 light_type = 5;
2003                                                         } else if ( token == "ols" ) {
2004                                                                 in1 >> node;
2005                                                                 sgSetVec3 (rway_ols, node[0], node[1], node[2] );
2006                                                                 light_type = 6;
2007                                                         } else if ( token == "red" ) {
2008                                                                 in1 >> node;
2009                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2010                                                                 light_type = 7;
2011                                                         } else if ( token == "green" ) {
2012                                                                 in1 >> node;
2013                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2014                                                                 light_type = 8;
2015                                                         } else if ( token == "lp" ) {
2016                                                                 in1 >> node;
2017                                                                 sgSetVec3 (lightpt, node[0], node[1], node[2] );
2018                                                                 lightpoints->add( lightpt );
2019                                                                 lightnormals->add( rway_normal );
2020                                                                 lightdir->add( rway_dir );
2021                                                                 ltype[ltcount]= light_type;
2022                                                                 ltcount++;
2023                                                         }
2024                                                         if (in1.eof()) break;
2025                                                 }
2026                                         }  //while
2027
2028 #if 0
2029                                         if ( lightpoints->getNum() ) {
2030                                                 ssgBranch *lightpoints_branch;
2031                                                 long int dummy = -999;
2032                                                 dummy_tile = new FGTileEntry((SGBucket)dummy);
2033                                                 dummy_tile->lightmaps_sequence = new ssgSelector;
2034                                                 dummy_tile->ols_transform = new ssgTransform;
2035
2036                                                 // call function to generate the runway lights
2037                                                 lightpoints_branch =
2038                                                 dummy_tile->gen_runway_lights( lightpoints, lightnormals,
2039                                                                                                                         lightdir, ltype);
2040                                                 lightpoints_brightness->addKid(lightpoints_branch);
2041                                                 lightpoints_transform->addKid(lightpoints_brightness);
2042                                             //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
2043                                                 lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
2044                                                 lightpoints_transform->ref();
2045                                                 globals->get_scenery()->get_gnd_lights_root()->addKid( lightpoints_transform );
2046                                         }
2047 #endif
2048                                 } //if in1
2049                 } //if objc
2050                             // end hack for deck lights
2051
2052                 objc++;
2053
2054                 if (in.eof()) break;
2055             }
2056         } // while
2057
2058         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
2059
2060         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
2061     }
2062
2063     return;
2064  }
2065
2066
2067 void fgUpdateDCS (void) {
2068
2069     // double eye_lat,eye_lon,eye_alt;
2070     // static double obj_head;
2071     double sl_radius,obj_latgc;
2072     // float nresultmat[4][4];
2073     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
2074     double bz[3];
2075
2076     // Instantaneous Geodetic Lat/Lon/Alt of moving object
2077     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
2078
2079     // Deck should be the first object in objects.txt in case of fdm=ada
2080
2081     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
2082             if ((fdm->get_iaux(1))==1)
2083             {
2084                     obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
2085                     obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
2086                     obj_alt[1] = fdm->get_daux(3);
2087                     obj_pitch[1] = fdm->get_faux(1);
2088                     obj_roll[1] = fdm->get_faux(2);
2089             }
2090     }
2091
2092     for ( int m = 0; m < objc; m++ ) {
2093         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
2094         //int v=getchar();
2095
2096         //Geodetic to Geocentric angles for rotation
2097         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
2098
2099         //moving object gbs-posn in cartesian coords
2100         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
2101         Point3D obj_pos = sgGeodToCart( obj_posn );
2102
2103         // Translate moving object w.r.t eye
2104         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
2105         bz[0]=Objtrans.x();
2106         bz[1]=Objtrans.y();
2107         bz[2]=Objtrans.z();
2108
2109        // rotate dynamic objects for lat,lon & alt and other motion about its axes
2110
2111         sgMat4 sgTRANS;
2112         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
2113
2114         sgVec3 ship_fwd,ship_rt,ship_up;
2115         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
2116         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
2117         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
2118
2119         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
2120         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
2121         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
2122         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
2123         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
2124         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
2125
2126         sgMat4 sgTUX;
2127         sgCopyMat4( sgTUX, sgROT_hdg );
2128         sgPostMultMat4( sgTUX, sgROT_pitch );
2129         sgPostMultMat4( sgTUX, sgROT_roll );
2130         sgPostMultMat4( sgTUX, sgROT_lat );
2131         sgPostMultMat4( sgTUX, sgROT_lon );
2132         sgPostMultMat4( sgTUX, sgTRANS );
2133
2134         sgCoord shippos;
2135         sgSetCoord(&shippos, sgTUX );
2136         ship_pos[m]->setTransform( &shippos );
2137         // temporary hack for deck lights - ultimately should move to PLib (when ??)
2138         if (m == 1) {
2139             if (lightpoints_transform) {
2140                     lightpoints_transform->setTransform( &shippos );
2141                     float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
2142                     if ( sun_angle > 89 ) {
2143                             lightpoints_brightness->select(0x01);
2144                     } else {
2145                             lightpoints_brightness->select(0x00);
2146                     }
2147             }
2148
2149             float elev;
2150             sgVec3 rp,to;
2151             float *vp;
2152             float alt;
2153             float ref_elev;
2154             sgXformPnt3( rp, rway_ols, sgTUX );
2155             vp = globals->get_current_view()->get_view_pos();
2156             to[0] = rp[0]-vp[0];
2157             to[1] = rp[1]-vp[1];
2158             to[2] = rp[2]-vp[2];
2159             float dist = sgLengthVec3( to );
2160             alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
2161
2162             elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
2163
2164             ref_elev = elev - 3.75; // +ve above, -ve below
2165
2166             unsigned int sel;
2167             sel = 0xFF;
2168 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2169 //              if (ref_elev > 0.51) sel = 0x21;
2170 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
2171 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
2172 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
2173 //              if (ref_elev < -0.51) sel = 0x30;
2174 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2175             // dummy_tile->lightmaps_sequence->select(sel);
2176
2177             sgVec3 up;
2178             sgCopyVec3 (up, ship_up);
2179             if (dist > 750)
2180                     sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
2181             else
2182                     sgScaleVec3 (up, 4.0*ref_elev);
2183             // dummy_tile->ols_transform->setTransform(up);
2184             //cout << "ref_elev  " << ref_elev << endl;
2185         }
2186     // end hack for deck lights
2187
2188     }
2189     if ( ship_sel != NULL ) {
2190         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2191     }
2192 }
2193
2194 // $$$ end - added VS Renganathan, 15 Oct 2K
2195 //           added Venky         , 12 Nov 2K