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 #include <simgear/screen/extensions.hxx>
  43
  44 #include <Environment/environment_mgr.hxx>
  45
  46 #ifdef SG_MATH_EXCEPTION_CLASH
  47 #  include <math.h>
  48 #endif
  49
  50 #ifdef HAVE_WINDOWS_H
  51 #  include <windows.h>
  52 #  include <float.h>
  53 #endif
  54
  55 #include GLUT_H
  56
  57 #include <stdio.h>
  58 #include <string.h>             // for strcmp()
  59 #include <string>
  60
  61 #ifdef HAVE_STDLIB_H
  62 #   include <stdlib.h>
  63 #endif
  64
  65 #ifdef HAVE_SYS_STAT_H
  66 #  include <sys/stat.h>         // for stat()
  67 #endif
  68
  69 #ifdef HAVE_UNISTD_H
  70 #  include <unistd.h>           // for stat()
  71 #endif
  72
  73 #include <plib/netChat.h>
  74 #include <plib/pu.h>
  75 #include <plib/sg.h>
  76 #include <plib/ssg.h>
  77
  78 #include <simgear/constants.h>  // for VERSION
  79 #include <simgear/debug/logstream.hxx>
  80 #include <simgear/math/polar3d.hxx>
  81 #include <simgear/math/sg_random.h>
  82 #include <simgear/misc/sg_path.hxx>
  83 #include <simgear/scene/material/matlib.hxx>
  84 #include <simgear/scene/model/animation.hxx>
  85 #include <simgear/scene/model/location.hxx>
  86 #include <simgear/scene/model/model.hxx>
  87 #include <simgear/scene/model/modellib.hxx>
  88 #ifdef FG_USE_CLOUDS_3D
  89 #  include <simgear/scene/sky/clouds3d/SkySceneLoader.hpp>
  90 #  include <simgear/scene/sky/clouds3d/SkyUtil.hpp>
  91 #endif
  92 #include <simgear/scene/sky/sky.hxx>
  93 #include <simgear/timing/sg_time.hxx>
  94
  95 #include <Include/general.hxx>
  96
  97 #include <Aircraft/aircraft.hxx>
  98
  99 #include <ATC/ATCmgr.hxx>
 100 #include <ATC/ATCdisplay.hxx>
 101 #include <ATC/AIMgr.hxx>
 102
 103 #include <Autopilot/newauto.hxx>
 104
 105 #include <Cockpit/hud.hxx>
 106 #include <Cockpit/cockpit.hxx>
 107 #include <Cockpit/radiostack.hxx>
 108
 109 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 110 #include <GUI/gui.h>
 111 #include <Model/acmodel.hxx>
 112 #include <Model/modelmgr.hxx>
 113 #include <Model/panelnode.hxx>
 114 #ifdef FG_NETWORK_OLK
 115 #include <NetworkOLK/network.h>
 116 #endif
 117
 118 #ifdef FG_MPLAYER_AS
 119 #include <MultiPlayer/multiplaytxmgr.hxx>
 120 #include <MultiPlayer/multiplayrxmgr.hxx>
 121 #endif
 122
 123 #include <Replay/replay.hxx>
 124 #include <Scenery/scenery.hxx>
 125 #include <Scenery/tilemgr.hxx>
 126 #ifdef ENABLE_AUDIO_SUPPORT
 127 #  include <Sound/fg_fx.hxx>
 128 #  include <Sound/morse.hxx>
 129 #endif
 130 #include <Systems/system_mgr.hxx>
 131 #include <Instrumentation/instrument_mgr.hxx>
 132 #include <Time/FGEventMgr.hxx>
 133 #include <Time/fg_timer.hxx>
 134 #include <Time/light.hxx>
 135 #include <Time/sunpos.hxx>
 136 #include <Time/tmp.hxx>
 137
 138 // ADA
 139 #include <simgear/misc/sgstream.hxx>
 140 #include <simgear/math/point3d.hxx>
 141 #include <FDM/flight.hxx>
 142 #include <FDM/ADA.hxx>
 143 #include <Scenery/tileentry.hxx>
 144
 145 #include "fg_commands.hxx"
 146
 147 glPointParameterfProc glPointParameterfPtr = 0;
 148 glPointParameterfvProc glPointParameterfvPtr = 0;
 149 bool glPointParameterIsSupported = false;
 150
 151 float default_attenuation[3] = {1.0, 0.0, 0.0};
 152 //Required for using GL_extensions
 153 void fgLoadDCS (void);
 154 void fgUpdateDCS (void);
 155 ssgSelector *ship_sel=NULL;
 156 // upto 32 instances of a same object can be loaded.
 157 ssgTransform *ship_pos[32];
 158 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 159 int objc=0;
 160 ssgSelector *lightpoints_brightness = new ssgSelector;
 161 ssgTransform *lightpoints_transform = new ssgTransform;
 162 FGTileEntry *dummy_tile;
 163 sgVec3 rway_ols;
 164 // ADA
 165 // Clip plane settings...
 166 float scene_nearplane = 0.5f;
 167 float scene_farplane = 120000.0f;
 168
 169 static double delta_time_sec = 0.0;
 170
 171
 172 #ifdef FG_WEATHERCM
 173 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 174 #endif
 175
 176 #include "version.h"
 177
 178 #include "fg_init.hxx"
 179 #include "fg_io.hxx"
 180 #include "fg_props.hxx"
 181 #include "globals.hxx"
 182 #include "splash.hxx"
 183 #include "viewmgr.hxx"
 184 #include "options.hxx"
 185 #include "logger.hxx"
 186
 187 #ifdef macintosh
 188 #  include <console.h>          // -dw- for command line dialog
 189 #endif
 190
 191
 192 FGEventMgr global_events;
 193
 194 // This is a record containing a bit of global housekeeping information
 195 FGGeneral general;
 196
 197 // Specify our current idle function state.  This is used to run all
 198 // our initializations out of the glutIdleLoop() so that we can get a
 199 // splash screen up and running right away.
 200 static int idle_state = 0;
 201 static long global_multi_loop;
 202
 203 // fog constants.  I'm a little nervous about putting actual code out
 204 // here but it seems to work (?)
 205 static const double m_log01 = -log( 0.01 );
 206 static const double sqrt_m_log01 = sqrt( m_log01 );
 207 static GLfloat fog_exp_density;
 208 static GLfloat fog_exp2_density;
 209 static GLfloat rwy_exp2_punch_through;
 210 static GLfloat taxi_exp2_punch_through;
 211 static GLfloat ground_exp2_punch_through;
 212
 213 #ifdef FG_NETWORK_OLK
 214 ssgSelector *fgd_sel = NULL;
 215 ssgTransform *fgd_pos = NULL;
 216 #endif
 217
 218 // Sky structures
 219 SGSky *thesky;
 220
 221 #ifdef FG_USE_CLOUDS_3D
 222   SkySceneLoader *sgClouds3d;
 223   bool _bcloud_orig = true;
 224 #endif
 225
 226 // hack
 227 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 228 {
 229   {  1.0f,  0.0f,  0.0f,  0.0f },
 230   {  0.0f,  0.0f, -1.0f,  0.0f },
 231   {  0.0f,  1.0f,  0.0f,  0.0f },
 232   {  0.0f,  0.0f,  0.0f,  1.0f }
 233 };
 234
 235 // The following defines flightgear options. Because glutlib will also
 236 // want to parse its own options, those options must not be included here
 237 // or they will get parsed by the main program option parser. Hence case
 238 // is significant for any option added that might be in conflict with
 239 // glutlib's parser.
 240 //
 241 // glutlib parses for:
 242 //    -display
 243 //    -direct   (invalid in Win32)
 244 //    -geometry
 245 //    -gldebug
 246 //    -iconized
 247 //    -indirect (invalid in Win32)
 248 //    -synce
 249 //
 250 // Note that glutlib depends upon strings while this program's
 251 // option parser wants only initial characters followed by numbers
 252 // or pathnames.
 253 //
 254
 255
 256 ssgSimpleState *cloud3d_imposter_state;
 257 ssgSimpleState *default_state;
 258 ssgSimpleState *hud_and_panel;
 259 ssgSimpleState *menus;
 260
 261 SGTimeStamp last_time_stamp;
 262 SGTimeStamp current_time_stamp;
 263
 264
 265 void fgBuildRenderStates( void ) {
 266     default_state = new ssgSimpleState;
 267     default_state->ref();
 268     default_state->disable( GL_TEXTURE_2D );
 269     default_state->enable( GL_CULL_FACE );
 270     default_state->enable( GL_COLOR_MATERIAL );
 271     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 272     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 273     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 274     default_state->disable( GL_BLEND );
 275     default_state->disable( GL_ALPHA_TEST );
 276     default_state->disable( GL_LIGHTING );
 277
 278     cloud3d_imposter_state = new ssgSimpleState;
 279     cloud3d_imposter_state->ref();
 280     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 281     cloud3d_imposter_state->enable( GL_CULL_FACE );
 282     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 283     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 284     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 285     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 286     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 287     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 288     cloud3d_imposter_state->enable( GL_BLEND );
 289     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 290     cloud3d_imposter_state->disable( GL_LIGHTING );
 291
 292     hud_and_panel = new ssgSimpleState;
 293     hud_and_panel->ref();
 294     hud_and_panel->disable( GL_CULL_FACE );
 295     hud_and_panel->disable( GL_TEXTURE_2D );
 296     hud_and_panel->disable( GL_LIGHTING );
 297     hud_and_panel->enable( GL_BLEND );
 298
 299     menus = new ssgSimpleState;
 300     menus->ref();
 301     menus->disable( GL_CULL_FACE );
 302     menus->disable( GL_TEXTURE_2D );
 303     menus->enable( GL_BLEND );
 304 }
 305
 306
 307 // fgInitVisuals() -- Initialize various GL/view parameters
 308 void fgInitVisuals( void ) {
 309     fgLIGHT *l;
 310
 311     l = &cur_light_params;
 312
 313 #ifndef GLUT_WRONG_VERSION
 314     // Go full screen if requested ...
 315     if ( fgGetBool("/sim/startup/fullscreen") ) {
 316         glutFullScreen();
 317     }
 318 #endif
 319
 320     // If enabled, normal vectors specified with glNormal are scaled
 321     // to unit length after transformation.  Enabling this has
 322     // performance implications.  See the docs for glNormal.
 323     // glEnable( GL_NORMALIZE );
 324
 325     glEnable( GL_LIGHTING );
 326     glEnable( GL_LIGHT0 );
 327     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 328
 329     sgVec3 sunpos;
 330     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 331     ssgGetLight( 0 ) -> setPosition( sunpos );
 332
 333     glFogi (GL_FOG_MODE, GL_EXP2);
 334     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 335          (!fgGetBool("/sim/rendering/shading"))) {
 336         // if fastest fog requested, or if flat shading force fastest
 337         glHint ( GL_FOG_HINT, GL_FASTEST );
 338     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 339         glHint ( GL_FOG_HINT, GL_NICEST );
 340     }
 341     if ( fgGetBool("/sim/rendering/wireframe") ) {
 342         // draw wire frame
 343         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 344     }
 345
 346     // This is the default anyways, but it can't hurt
 347     glFrontFace ( GL_CCW );
 348
 349     // Just testing ...
 350     // glEnable(GL_POINT_SMOOTH);
 351     // glEnable(GL_LINE_SMOOTH);
 352     // glEnable(GL_POLYGON_SMOOTH);
 353 }
 354
 355
 356 // For HiRes screen Dumps using Brian Pauls TR Library
 357 void trRenderFrame( void ) {
 358
 359     if ( fgPanelVisible() ) {
 360         GLfloat height = fgGetInt("/sim/startup/ysize");
 361         GLfloat view_h =
 362             (globals->get_current_panel()->getViewHeight() - globals->get_current_panel()->getYOffset())
 363             * (height / 768.0) + 1;
 364         glTranslatef( 0.0, view_h, 0.0 );
 365     }
 366
 367     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 368     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 369
 370     fgLIGHT *l = &cur_light_params;
 371
 372     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 373                  l->adj_fog_color[2], l->adj_fog_color[3]);
 374
 375     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 376
 377     // set the opengl state to known default values
 378     default_state->force();
 379
 380     glEnable( GL_FOG );
 381     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 382     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 383     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 384
 385     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 386     // we only update GL_AMBIENT for our lights we will never get
 387     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 388     // explicitely to black.
 389     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 390     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 391
 392     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 393
 394     // texture parameters
 395     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 396     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 397
 398     // we need a white diffuse light for the phase of the moon
 399     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 400     thesky->preDraw();
 401
 402     // draw the ssg scene
 403     // return to the desired diffuse color
 404     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 405     glEnable( GL_DEPTH_TEST );
 406     ssgSetNearFar( scene_nearplane, scene_farplane );
 407     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 408
 409     // draw the lights
 410     glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 411     ssgSetNearFar( scene_nearplane, scene_farplane );
 412     ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 413
 414     ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 415
 416     if (fgGetBool("/environment/clouds/status"))
 417         thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 418
 419     globals->get_model_mgr()->draw();
 420     globals->get_aircraft_model()->draw();
 421 }
 422
 423
 424 // Update all Visuals (redraws anything graphics related)
 425 void fgRenderFrame() {
 426     bool draw_otw = fgGetBool("/sim/rendering/draw-otw");
 427     bool skyblend = fgGetBool("/sim/rendering/skyblend");
 428     bool enhanced_lighting = fgGetBool("/sim/rendering/enhanced-lighting");
 429     bool distance_attenuation = fgGetBool("/sim/rendering/distance-attenuation");
 430
 431     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 432     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 433
 434     // Process/manage pending events
 435     global_events.update( delta_time_sec );
 436
 437     // static const SGPropertyNode *longitude
 438     //     = fgGetNode("/position/longitude-deg");
 439     // static const SGPropertyNode *latitude
 440     //     = fgGetNode("/position/latitude-deg");
 441     // static const SGPropertyNode *altitude
 442     //     = fgGetNode("/position/altitude-ft");
 443     static const SGPropertyNode *groundlevel_nearplane
 444         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 445
 446     // Update the default (kludged) properties.
 447     fgUpdateProps();
 448
 449     FGViewer *current__view = globals->get_current_view();
 450
 451     fgLIGHT *l = &cur_light_params;
 452     static double last_visibility = -9999;
 453
 454     // update fog params
 455     double actual_visibility;
 456     if (fgGetBool("/environment/clouds/status"))
 457         actual_visibility = thesky->get_visibility();
 458     else
 459         actual_visibility = fgGetDouble("/environment/visibility-m");
 460     if ( actual_visibility != last_visibility ) {
 461         last_visibility = actual_visibility;
 462
 463         fog_exp_density = m_log01 / actual_visibility;
 464         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 465         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 466         if ( actual_visibility < 8000 ) {
 467             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 468             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 469         } else {
 470             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 471             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 472         }
 473     }
 474
 475     // double angle;
 476     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 477     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 478     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 479     // GLfloat mat_shininess[] = { 10.0 };
 480     GLbitfield clear_mask;
 481
 482     if ( idle_state != 1000 ) {
 483         // still initializing, draw the splash screen
 484         if ( fgGetBool("/sim/startup/splash-screen") ) {
 485             fgSplashUpdate(0.0, 1.0);
 486         }
 487         // Keep resetting sim time while the sim is initializing
 488         globals->set_sim_time_sec( 0.0 );
 489         SGAnimation::set_sim_time_sec( 0.0 );
 490     } else {
 491         // idle_state is now 1000 meaning we've finished all our
 492         // initializations and are running the main loop, so this will
 493         // now work without seg faulting the system.
 494
 495         // calculate our current position in cartesian space
 496         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 497
 498         // update view port
 499         fgReshape( fgGetInt("/sim/startup/xsize"),
 500                    fgGetInt("/sim/startup/ysize") );
 501
 502         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 503             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 504             cloud3d_imposter_state->force();
 505             glDisable( GL_FOG );
 506             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 507             glEnable(GL_DEPTH_TEST);
 508             glEnable(GL_BLEND);
 509             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 510
 511 #ifdef FG_USE_CLOUDS_3D
 512             if ( _bcloud_orig ) {
 513                 Point3D c = globals->get_scenery()->get_center();
 514                 sgClouds3d->Set_Cloud_Orig( &c );
 515                 _bcloud_orig = false;
 516             }
 517             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 518 #endif
 519             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 520             glDisable(GL_DEPTH_TEST);
 521         }
 522
 523         clear_mask = GL_DEPTH_BUFFER_BIT;
 524         if ( fgGetBool("/sim/rendering/wireframe") ) {
 525             clear_mask |= GL_COLOR_BUFFER_BIT;
 526         }
 527
 528         if ( skyblend ) {
 529             if ( fgGetBool("/sim/rendering/textures") ) {
 530             // glClearColor(black[0], black[1], black[2], black[3]);
 531             glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 532                          l->adj_fog_color[2], l->adj_fog_color[3]);
 533             clear_mask |= GL_COLOR_BUFFER_BIT;
 534             }
 535         } else {
 536             glClearColor(l->sky_color[0], l->sky_color[1],
 537                      l->sky_color[2], l->sky_color[3]);
 538             clear_mask |= GL_COLOR_BUFFER_BIT;
 539         }
 540         glClear( clear_mask );
 541
 542         // Tell GL we are switching to model view parameters
 543
 544         // I really should create a derived ssg node or use a call
 545         // back or something so that I can draw the sky within the
 546         // ssgCullAndDraw() function, but for now I just mimic what
 547         // ssg does to set up the model view matrix
 548         glMatrixMode(GL_MODELVIEW);
 549         glLoadIdentity();
 550         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 551
 552         // set the opengl state to known default values
 553         default_state->force();
 554
 555         // update fog params if visibility has changed
 556         double visibility_meters = fgGetDouble("/environment/visibility-m");
 557         thesky->set_visibility(visibility_meters);
 558
 559         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 560                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 561                             / (double)fgGetInt("/sim/model-hz") );
 562
 563         // Set correct opengl fog density
 564         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 565
 566         // update the sky dome
 567         if ( skyblend ) {
 568             /*
 569              SG_LOG( SG_GENERAL, SG_BULK, "thesky->repaint() sky_color = "
 570              << cur_light_params.sky_color[0] << " "
 571              << cur_light_params.sky_color[1] << " "
 572              << cur_light_params.sky_color[2] << " "
 573              << cur_light_params.sky_color[3] );
 574             SG_LOG( SG_GENERAL, SG_BULK, "    fog = "
 575              << cur_light_params.fog_color[0] << " "
 576              << cur_light_params.fog_color[1] << " "
 577              << cur_light_params.fog_color[2] << " "
 578              << cur_light_params.fog_color[3] );
 579             SG_LOG( SG_GENERAL, SG_BULK,
 580                     "    sun_angle = " << cur_light_params.sun_angle
 581              << "    moon_angle = " << cur_light_params.moon_angle );
 582             */
 583
 584             static SGSkyColor scolor;
 585
 586             scolor.sky_color   = cur_light_params.sky_color;
 587             scolor.fog_color   = cur_light_params.adj_fog_color;
 588             scolor.cloud_color = cur_light_params.cloud_color;
 589             scolor.sun_angle   = cur_light_params.sun_angle;
 590             scolor.moon_angle  = cur_light_params.moon_angle;
 591             scolor.nplanets    = globals->get_ephem()->getNumPlanets();
 592             scolor.nstars      = globals->get_ephem()->getNumStars();
 593             scolor.planet_data = globals->get_ephem()->getPlanets();
 594             scolor.star_data   = globals->get_ephem()->getStars();
 595
 596             thesky->repaint( scolor );
 597
 598             /*
 599             SG_LOG( SG_GENERAL, SG_BULK,
 600                     "thesky->reposition( view_pos = " << view_pos[0] << " "
 601              << view_pos[1] << " " << view_pos[2] );
 602             SG_LOG( SG_GENERAL, SG_BULK,
 603                     "    zero_elev = " << zero_elev[0] << " "
 604              << zero_elev[1] << " " << zero_elev[2]
 605              << " lon = " << cur_fdm_state->get_Longitude()
 606              << " lat = " << cur_fdm_state->get_Latitude() );
 607             SG_LOG( SG_GENERAL, SG_BULK,
 608                     "    sun_rot = " << cur_light_params.sun_rotation
 609              << " gst = " << SGTime::cur_time_params->getGst() );
 610             SG_LOG( SG_GENERAL, SG_BULK,
 611                  "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 612               << " sun dec = " << globals->get_ephem()->getSunDeclination()
 613               << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 614               << " moon dec = " << globals->get_ephem()->getMoonDeclination() );
 615             */
 616
 617             // The sun and moon distances are scaled down versions
 618             // of the actual distance to get both the moon and the sun
 619             // within the range of the far clip plane.
 620             // Moon distance:    384,467 kilometers
 621             // Sun distance: 150,000,000 kilometers
 622             double sun_horiz_eff, moon_horiz_eff;
 623             if (fgGetBool("/sim/rendering/horizon-effect")) {
 624             sun_horiz_eff = 0.67+pow(0.5+cos(cur_light_params.sun_angle*2)/2,0.33)/3;
 625             moon_horiz_eff = 0.67+pow(0.5+cos(cur_light_params.moon_angle*2)/2,0.33)/3;
 626             } else {
 627                sun_horiz_eff = moon_horiz_eff = 1.0;
 628             }
 629
 630             static SGSkyState sstate;
 631
 632             sstate.view_pos  = current__view->get_view_pos();
 633             sstate.zero_elev = current__view->get_zero_elev();
 634             sstate.view_up   = current__view->get_world_up();
 635             sstate.lon       = current__view->getLongitude_deg()
 636                                 * SGD_DEGREES_TO_RADIANS;
 637             sstate.lat       = current__view->getLatitude_deg()
 638                                 * SGD_DEGREES_TO_RADIANS;
 639             sstate.alt       = current__view->getAltitudeASL_ft()
 640                                 * SG_FEET_TO_METER;
 641             sstate.spin      = cur_light_params.sun_rotation;
 642             sstate.gst       = globals->get_time_params()->getGst();
 643             sstate.sun_ra    = globals->get_ephem()->getSunRightAscension();
 644             sstate.sun_dec   = globals->get_ephem()->getSunDeclination();
 645             sstate.sun_dist  = 50000.0 * sun_horiz_eff;
 646             sstate.moon_ra   = globals->get_ephem()->getMoonRightAscension();
 647             sstate.moon_dec  = globals->get_ephem()->getMoonDeclination();
 648             sstate.moon_dist = 40000.0 * moon_horiz_eff;
 649
 650             thesky->reposition( sstate );
 651         }
 652
 653         glEnable( GL_DEPTH_TEST );
 654         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 655             glEnable( GL_FOG );
 656             glFogi( GL_FOG_MODE, GL_EXP2 );
 657             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 658         }
 659
 660         // set sun/lighting parameters
 661         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 662
 663         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 664         // we only update GL_AMBIENT for our lights we will never get
 665         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 666         // explicitely to black.
 667         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 668
 669         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 670         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 671         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 672
 673         // texture parameters
 674         // glEnable( GL_TEXTURE_2D );
 675         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 676         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 677
 678         // glMatrixMode( GL_PROJECTION );
 679         // glLoadIdentity();
 680         ssgSetFOV( current__view->get_h_fov(),
 681                    current__view->get_v_fov() );
 682
 683         double agl =
 684             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 685             - globals->get_scenery()->get_cur_elev();
 686
 687         if ( agl > 10.0 ) {
 688             scene_nearplane = 10.0f;
 689             scene_farplane = 120000.0f;
 690         } else {
 691             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 692             scene_farplane = 120000.0f;
 693         }
 694
 695         ssgSetNearFar( scene_nearplane, scene_farplane );
 696
 697         // $$$ begin - added VS Renganthan 17 Oct 2K
 698         if(objc)
 699           fgUpdateDCS();
 700         // $$$ end - added VS Renganthan 17 Oct 2K
 701
 702 # ifdef FG_NETWORK_OLK
 703         if ( fgGetBool("/sim/networking/network-olk") ) {
 704             sgCoord fgdpos;
 705             other = head->next;             /* put listpointer to start  */
 706             while ( other != tail) {        /* display all except myself */
 707             if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 708                 other->fgd_sel->select(1);
 709                 sgSetCoord( &fgdpos, other->sgFGD_COORD );
 710                 other->fgd_pos->setTransform( &fgdpos );
 711             }
 712             other = other->next;
 713             }
 714
 715             // fgd_sel->select(1);
 716             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 717             // sgCoord fgdpos;
 718             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 719             // fgd_pos->setTransform( &fgdpos);
 720         }
 721 # endif
 722
 723 #ifdef FG_MPLAYER_AS
 724         // Update any multiplayer models
 725         globals->get_multiplayer_rx_mgr()->Update();
 726 #endif
 727
 728         if ( draw_otw && skyblend )
 729         {
 730             // draw the sky backdrop
 731
 732             // we need a white diffuse light for the phase of the moon
 733             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 734
 735             thesky->preDraw();
 736
 737             // return to the desired diffuse color
 738             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 739         }
 740
 741         // draw the ssg scene
 742         glEnable( GL_DEPTH_TEST );
 743
 744         ssgSetNearFar( scene_nearplane, scene_farplane );
 745
 746         if ( fgGetBool("/sim/rendering/wireframe") ) {
 747             // draw wire frame
 748             glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 749         }
 750         if ( draw_otw ) {
 751             ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 752         }
 753
 754         // This is a bit kludgy.  Every 200 frames, do an extra
 755         // traversal of the scene graph without drawing anything, but
 756         // with the field-of-view set to 360x360 degrees.  This
 757         // ensures that out-of-range random objects that are not in
 758         // the current view frustum will still be freed properly.
 759         static int counter = 0;
 760         counter++;
 761         if (counter == 200) {
 762           sgFrustum f;
 763           f.setFOV(360, 360);
 764                             // No need to put the near plane too close;
 765                             // this way, at least the aircraft can be
 766                             // culled.
 767           f.setNearFar(1000, 1000000);
 768           sgMat4 m;
 769           ssgGetModelviewMatrix(m);
 770           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 771           counter = 0;
 772         }
 773
 774         // change state for lighting here
 775
 776         // draw runway lighting
 777         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 778         ssgSetNearFar( scene_nearplane, scene_farplane );
 779
 780         if ( enhanced_lighting ) {
 781
 782             // Enable states for drawing points with GL_extension
 783             glEnable(GL_POINT_SMOOTH);
 784
 785             if ( distance_attenuation && glPointParameterIsSupported )
 786             {
 787                 // Enable states for drawing points with GL_extension
 788                 glEnable(GL_POINT_SMOOTH);
 789
 790                 float quadratic[3] = {1.0, 0.001, 0.0000001};
 791                 // makes the points fade as they move away
 792                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 793                 glPointParameterfPtr(GL_POINT_SIZE_MIN_EXT, 1.0);
 794             }
 795
 796             glPointSize(4.0);
 797
 798             // blending function for runway lights
 799             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 800         }
 801
 802         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 803         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 804         glEnable(GL_TEXTURE_GEN_S);
 805         glEnable(GL_TEXTURE_GEN_T);
 806         glPolygonMode(GL_FRONT, GL_POINT);
 807
 808         // draw runway lighting
 809         if ( draw_otw ) {
 810             ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 811         }
 812
 813         // change punch through and then draw taxi lighting
 814         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 815         // sgVec3 taxi_fog;
 816         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 817         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 818         if ( draw_otw ) {
 819             ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 820         }
 821
 822         // clean up lighting
 823         glPolygonMode(GL_FRONT, GL_FILL);
 824         glDisable(GL_TEXTURE_GEN_S);
 825         glDisable(GL_TEXTURE_GEN_T);
 826
 827         //static int _frame_count = 0;
 828         //if (_frame_count % 30 == 0) {
 829         //  printf("SSG: %s\n", ssgShowStats());
 830         //}
 831         //else {
 832         //  ssgShowStats();
 833         //}
 834         //_frame_count++;
 835
 836
 837         if ( enhanced_lighting ) {
 838             if ( distance_attenuation && glPointParameterIsSupported )
 839             {
 840                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT,
 841                                       default_attenuation);
 842             }
 843
 844             glPointSize(1.0);
 845             glDisable(GL_POINT_SMOOTH);
 846         }
 847
 848         // draw ground lighting
 849         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 850         if ( draw_otw ) {
 851             ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 852         }
 853
 854         if ( skyblend ) {
 855             // draw the sky cloud layers
 856             if ( draw_otw && fgGetBool("/environment/clouds/status") )
 857             {
 858                 thesky->postDraw( cur_fdm_state->get_Altitude()
 859                                   * SG_FEET_TO_METER );
 860             }
 861         }
 862
 863         if ( draw_otw && fgGetBool("/sim/rendering/clouds3d") )
 864         {
 865             glDisable( GL_FOG );
 866             glDisable( GL_LIGHTING );
 867             // cout << "drawing new clouds" << endl;
 868
 869             glEnable(GL_DEPTH_TEST);
 870             glEnable(GL_BLEND);
 871             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 872
 873             /*
 874             glEnable( GL_TEXTURE_2D );
 875             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 876             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 877             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 878             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 879             */
 880
 881 #ifdef FG_USE_CLOUDS_3D
 882             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 883 #endif
 884             glEnable( GL_FOG );
 885             glEnable( GL_LIGHTING );
 886             glEnable( GL_DEPTH_TEST );
 887             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 888         }
 889
 890         if ( draw_otw ) {
 891             globals->get_model_mgr()->draw();
 892             globals->get_aircraft_model()->draw();
 893         }
 894
 895         // display HUD && Panel
 896         glDisable( GL_FOG );
 897         glDisable( GL_DEPTH_TEST );
 898         // glDisable( GL_CULL_FACE );
 899         // glDisable( GL_TEXTURE_2D );
 900
 901         // update the controls subsystem
 902         globals->get_controls()->update(delta_time_sec);
 903
 904         hud_and_panel->apply();
 905         fgCockpitUpdate();
 906
 907         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 908         // This only works properly if called before the panel call
 909         if((fgGetBool("/sim/ATC/enabled")) || (fgGetBool("/sim/ai-traffic/enabled")))
 910             globals->get_ATC_display()->update(delta_time_sec);
 911
 912         // update the panel subsystem
 913         if ( globals->get_current_panel() != NULL ) {
 914             globals->get_current_panel()->update(delta_time_sec);
 915         }
 916         fgUpdate3DPanels();
 917
 918         // We can do translucent menus, so why not. :-)
 919         menus->apply();
 920         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 921         puDisplay();
 922         // glDisable ( GL_BLEND ) ;
 923
 924         glEnable( GL_DEPTH_TEST );
 925         glEnable( GL_FOG );
 926
 927         // Fade out the splash screen over the first three seconds.
 928         double t = globals->get_sim_time_sec();
 929         if ( t <= 1.0 ) {
 930             fgSplashUpdate(0.0, 1.0);
 931         } else if ( t <= 3.0) {
 932             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 933         }
 934     }
 935
 936     glutSwapBuffers();
 937 }
 938
 939
 940 // Update internal time dependent calculations (i.e. flight model)
 941 // FIXME: this distinction is obsolete; all subsystems now get delta
 942 // time on update.
 943 void fgUpdateTimeDepCalcs() {
 944     static bool inited = false;
 945
 946     static const SGPropertyNode *replay_master
 947         = fgGetNode( "/sim/freeze/replay", true );
 948     static SGPropertyNode *replay_time
 949         = fgGetNode( "/sim/replay/time", true );
 950     static const SGPropertyNode *replay_end_time
 951         = fgGetNode( "/sim/replay/end-time", true );
 952
 953     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 954
 955     fgLIGHT *l = &cur_light_params;
 956
 957     // Initialize the FDM here if it hasn't been and if we have a
 958     // scenery elevation hit.
 959
 960     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 961     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 962
 963     if ( !cur_fdm_state->get_inited() &&
 964          globals->get_scenery()->get_cur_elev() > -9990 )
 965     {
 966         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 967         cur_fdm_state->init();
 968         if ( cur_fdm_state->get_bound() ) {
 969             cur_fdm_state->unbind();
 970         }
 971         cur_fdm_state->bind();
 972     }
 973
 974     // conceptually, the following block could be done for each fdm
 975     // instance ...
 976     if ( cur_fdm_state->get_inited() ) {
 977         // we have been inited, and  we are good to go ...
 978
 979         if ( !inited ) {
 980             inited = true;
 981         }
 982
 983         if ( ! replay_master->getBoolValue() ) {
 984             globals->get_autopilot()->update( delta_time_sec );
 985             cur_fdm_state->update( delta_time_sec );
 986         } else {
 987             FGReplay *r = (FGReplay *)(globals->get_subsystem( "replay" ));
 988             r->replay( replay_time->getDoubleValue() );
 989             replay_time->setDoubleValue( replay_time->getDoubleValue()
 990                                          + ( delta_time_sec
 991                                              * fgGetInt("/sim/speed-up") ) );
 992         }
 993     } else {
 994         // do nothing, fdm isn't inited yet
 995     }
 996
 997     globals->get_model_mgr()->update(delta_time_sec);
 998     globals->get_aircraft_model()->update(delta_time_sec);
 999
1000     // update the view angle
1001     globals->get_viewmgr()->update(delta_time_sec);
1002
1003     l->UpdateAdjFog();
1004
1005     // Update solar system
1006     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
1007                               globals->get_time_params()->getLst(),
1008                               cur_fdm_state->get_Latitude() );
1009
1010     // Update radio stack model
1011     current_radiostack->update(delta_time_sec);
1012 }
1013
1014
1015 void fgInitTimeDepCalcs( void ) {
1016     // noop for now
1017 }
1018
1019
1020 static const double alt_adjust_ft = 3.758099;
1021 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
1022
1023
1024 // What should we do when we have nothing else to do?  Let's get ready
1025 // for the next move and update the display?
1026 static void fgMainLoop( void ) {
1027     int model_hz = fgGetInt("/sim/model-hz");
1028
1029     static const SGPropertyNode *longitude
1030         = fgGetNode("/position/longitude-deg");
1031     static const SGPropertyNode *latitude
1032         = fgGetNode("/position/latitude-deg");
1033     static const SGPropertyNode *altitude
1034         = fgGetNode("/position/altitude-ft");
1035     static const SGPropertyNode *clock_freeze
1036         = fgGetNode("/sim/freeze/clock", true);
1037     static const SGPropertyNode *cur_time_override
1038         = fgGetNode("/sim/time/cur-time-override", true);
1039     static const SGPropertyNode *replay_master
1040         = fgGetNode("/sim/freeze/replay", true);
1041
1042     // Update the elapsed time.
1043     static bool first_time = true;
1044     if ( first_time ) {
1045         last_time_stamp.stamp();
1046         first_time = false;
1047     }
1048
1049     double throttle_hz = fgGetDouble("/sim/frame-rate-throttle-hz", 0.0);
1050     if ( throttle_hz > 0.0 ) {
1051         // simple frame rate throttle
1052         double dt = 1000000.0 / throttle_hz;
1053         current_time_stamp.stamp();
1054         while ( current_time_stamp - last_time_stamp < dt ) {
1055             current_time_stamp.stamp();
1056         }
1057     } else {
1058         // run as fast as the app will go
1059         current_time_stamp.stamp();
1060     }
1061
1062     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
1063     if ( clock_freeze->getBoolValue() ) {
1064         delta_time_sec = 0;
1065     }
1066     last_time_stamp = current_time_stamp;
1067     globals->inc_sim_time_sec( delta_time_sec );
1068     SGAnimation::set_sim_time_sec( globals->get_sim_time_sec() );
1069
1070     static long remainder = 0;
1071     long elapsed;
1072 #ifdef FANCY_FRAME_COUNTER
1073     int i;
1074     double accum;
1075 #else
1076     static time_t last_time = 0;
1077     static int frames = 0;
1078 #endif // FANCY_FRAME_COUNTER
1079
1080     SGTime *t = globals->get_time_params();
1081
1082     sglog().setLogLevels( SG_ALL, (sgDebugPriority)fgGetInt("/sim/log-level") );
1083     sglog().setLogLevels( SG_ALL, SG_INFO );
1084
1085     SGLocation * acmodel_location = 0;
1086     if(cur_fdm_state->getACModel() != 0) {
1087       acmodel_location = (SGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getSGLocation();
1088     }
1089
1090     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
1091     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
1092
1093 #ifdef FG_NETWORK_OLK
1094     if ( fgGetBool("/sim/networking/network-olk") ) {
1095         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
1096             // printf("FGD: Netupdate\n");
1097             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
1098             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
1099         }
1100     }
1101 #endif
1102
1103 #if defined( ENABLE_PLIB_JOYSTICK )
1104     // Read joystick and update control settings
1105     // if ( fgGetString("/sim/control-mode") == "joystick" )
1106     // {
1107     //    fgJoystickRead();
1108     // }
1109 #elif defined( ENABLE_GLUT_JOYSTICK )
1110     // Glut joystick support works by feeding a joystick handler
1111     // function to glut.  This is taken care of once in the joystick
1112     // init routine and we don't have to worry about it again.
1113 #endif
1114
1115     // Fix elevation.  I'm just sticking this here for now, it should
1116     // probably move eventually
1117
1118     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
1119            scenery.get_cur_elev(),
1120            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1121            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1122
1123 #if 0
1124 // This code is used by LaRCsim/UIUC to position the aircraft at a proper
1125 // place. This code should eventually go into the LaRCsim directory.
1126 // Commented out at Jul 27 2003 because tests show it is not needed.
1127 // Can probbaly be safely removed after Spet. 2003 - EMH
1128
1129     if ( acmodel_location != 0 ) {
1130       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
1131         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
1132              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 130.0) ) {
1133             // now set aircraft altitude above ground
1134             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
1135                cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
1136                acmodel_location->get_cur_elev_m() + alt_adjust_m - 130.0,
1137                acmodel_location->get_cur_elev_m() + alt_adjust_m );
1138             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
1139                                                 + alt_adjust_m) * SG_METER_TO_FEET );
1140             SG_LOG( SG_ALL, SG_DEBUG,
1141                 "<*> resetting altitude to "
1142                 << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
1143                 << " meters" );
1144         }
1145       }
1146     }
1147 // End of code in question. (see Curt is this code used? above)
1148 #endif
1149
1150     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
1151            scenery.get_cur_elev(),
1152            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1153            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1154
1155     // cout << "Warp = " << globals->get_warp() << endl;
1156
1157     // update "time"
1158     static bool last_clock_freeze = false;
1159
1160     if ( clock_freeze->getBoolValue() ) {
1161         // clock freeze requested
1162         if ( cur_time_override->getLongValue() == 0 ) {
1163             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
1164             globals->set_warp( 0 );
1165         }
1166     } else {
1167         // no clock freeze requested
1168         if ( last_clock_freeze == true ) {
1169             // clock just unfroze, let's set warp as the difference
1170             // between frozen time and current time so we don't get a
1171             // time jump (and corresponding sky object and lighting
1172             // jump.)
1173             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
1174             fgSetLong( "/sim/time/cur-time-override", 0 );
1175         }
1176         if ( globals->get_warp_delta() != 0 ) {
1177             globals->inc_warp( globals->get_warp_delta() );
1178         }
1179     }
1180
1181     last_clock_freeze = clock_freeze->getBoolValue();
1182
1183     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1184                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1185                cur_time_override->getLongValue(),
1186                globals->get_warp() );
1187
1188     if ( globals->get_warp_delta() != 0 ) {
1189         fgUpdateSkyAndLightingParams();
1190     }
1191
1192     // update magvar model
1193     globals->get_mag()->update( longitude->getDoubleValue()
1194                               * SGD_DEGREES_TO_RADIANS,
1195                             latitude->getDoubleValue()
1196                               * SGD_DEGREES_TO_RADIANS,
1197                             altitude->getDoubleValue() * SG_FEET_TO_METER,
1198                             globals->get_time_params()->getJD() );
1199
1200     // Get elapsed time (in usec) for this past frame
1201     elapsed = fgGetTimeInterval();
1202     SG_LOG( SG_ALL, SG_DEBUG,
1203             "Elapsed time interval is = " << elapsed
1204             << ", previous remainder is = " << remainder );
1205
1206     // Calculate frame rate average
1207 #ifdef FANCY_FRAME_COUNTER
1208     /* old fps calculation */
1209     if ( elapsed > 0 ) {
1210         double tmp;
1211         accum = 0.0;
1212         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1213             tmp = general.get_frame(i);
1214             accum += tmp;
1215             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1216             general.set_frame(i+1,tmp);
1217         }
1218         tmp = 1000000.0 / (float)elapsed;
1219         general.set_frame(0,tmp);
1220         // printf("frame[0] = %.2f\n", general.frames[0]);
1221         accum += tmp;
1222         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1223         // printf("ave = %.2f\n", general.frame_rate);
1224     }
1225 #else
1226     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1227         general.set_frame_rate( frames );
1228         fgSetInt("/sim/frame-rate", frames);
1229         SG_LOG( SG_ALL, SG_DEBUG,
1230             "--> Frame rate is = " << general.get_frame_rate() );
1231         frames = 0;
1232     }
1233     last_time = t->get_cur_time();
1234     ++frames;
1235 #endif
1236
1237     // Run ATC subsystem
1238     if (fgGetBool("/sim/ATC/enabled"))
1239         globals->get_ATC_mgr()->update(delta_time_sec);
1240
1241     // Run the AI subsystem
1242     if (fgGetBool("/sim/ai-traffic/enabled"))
1243         globals->get_AI_mgr()->update(delta_time_sec);
1244
1245     // Run flight model
1246
1247     // Calculate model iterations needed for next frame
1248     elapsed += remainder;
1249
1250     global_multi_loop = (long)(((double)elapsed * 0.000001) * model_hz );
1251     remainder = elapsed - ( (global_multi_loop*1000000) / model_hz );
1252     SG_LOG( SG_ALL, SG_DEBUG,
1253             "Model iterations needed = " << global_multi_loop
1254             << ", new remainder = " << remainder );
1255
1256     // chop max interations to something reasonable if the sim was
1257     // delayed for an excesive amount of time
1258     if ( global_multi_loop > 2.0 * model_hz ) {
1259         global_multi_loop = (int)(2.0 * model_hz );
1260         remainder = 0;
1261     }
1262
1263     // flight model
1264     if ( global_multi_loop > 0 ) {
1265         fgUpdateTimeDepCalcs();
1266     } else {
1267         SG_LOG( SG_ALL, SG_DEBUG,
1268             "Elapsed time is zero ... we're zinging" );
1269     }
1270
1271     // Do any I/O channel work that might need to be done
1272     globals->get_io()->update( delta_time_sec );
1273
1274     // see if we need to load any deferred-load textures
1275     globals->get_matlib()->load_next_deferred();
1276
1277     // Run audio scheduler
1278 #ifdef ENABLE_AUDIO_SUPPORT
1279     if ( fgGetBool("/sim/sound/audible")
1280            && globals->get_soundmgr()->is_working() ) {
1281         globals->get_soundmgr()->update( delta_time_sec );
1282     }
1283 #endif
1284
1285     globals->get_subsystem_mgr()->update(delta_time_sec);
1286
1287     //
1288     // Tile Manager updates - see if we need to load any new scenery tiles.
1289     //   this code ties together the fdm, viewer and scenery classes...
1290     //   we may want to move this to it's own class at some point
1291     //
1292     double visibility_meters = fgGetDouble("/environment/visibility-m");
1293     FGViewer *current_view = globals->get_current_view();
1294
1295     // update tile manager for FDM...
1296     // ...only if location is different than the viewer (to avoid duplicating effort)
1297     if( acmodel_location != current_view->getSGLocation() ) {
1298       if( acmodel_location != 0 ) {
1299         globals->get_tile_mgr()->prep_ssg_nodes( acmodel_location,
1300                                                  visibility_meters );
1301         globals->get_tile_mgr()->
1302             update( acmodel_location, visibility_meters,
1303                     acmodel_location->get_absolute_view_pos(globals->get_scenery()->get_center()) );
1304         // save results of update in SGLocation for fdm...
1305         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1306           acmodel_location->
1307               set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1308         }
1309         acmodel_location->
1310             set_tile_center( globals->get_scenery()->get_next_center() );
1311       }
1312     }
1313
1314     globals->get_tile_mgr()->prep_ssg_nodes( current_view->getSGLocation(),
1315                                              visibility_meters );
1316     // update tile manager for view...
1317     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1318     // after the FDM's until all of Flight Gear code references the viewer's location
1319     // for elevation instead of the "scenery's" current elevation.
1320     SGLocation *view_location = globals->get_current_view()->getSGLocation();
1321     globals->get_tile_mgr()->update( view_location, visibility_meters,
1322                                      current_view->get_absolute_view_pos() );
1323     // save results of update in SGLocation for fdm...
1324     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1325       current_view->getSGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1326     }
1327     current_view->getSGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1328
1329     // If fdm location is same as viewer's then we didn't do the update for fdm location
1330     //   above so we need to save the viewer results in the fdm SGLocation as well...
1331     if( acmodel_location == current_view->getSGLocation() ) {
1332       if( acmodel_location != 0 ) {
1333         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1334           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1335         }
1336         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1337       }
1338     }
1339
1340     // END Tile Manager udpates
1341
1342     // redraw display
1343     fgRenderFrame();
1344
1345     SG_LOG( SG_ALL, SG_DEBUG, "" );
1346 }
1347
1348
1349 // This is the top level master main function that is registered as
1350 // our idle funciton
1351
1352 // The first few passes take care of initialization things (a couple
1353 // per pass) and once everything has been initialized fgMainLoop from
1354 // then on.
1355
1356 static void fgIdleFunction ( void ) {
1357     // printf("idle state == %d\n", idle_state);
1358
1359     if ( idle_state == 0 ) {
1360         // Initialize the splash screen right away
1361         if ( fgGetBool("/sim/startup/splash-screen") ) {
1362             fgSplashInit();
1363         }
1364
1365         idle_state++;
1366     } else if ( idle_state == 1 ) {
1367         // Initialize audio support
1368 #ifdef ENABLE_AUDIO_SUPPORT
1369
1370         // Start the intro music
1371         if ( fgGetBool("/sim/startup/intro-music") ) {
1372             SGPath mp3file( globals->get_fg_root() );
1373             mp3file.append( "Sounds/intro.mp3" );
1374
1375             SG_LOG( SG_GENERAL, SG_INFO,
1376                 "Starting intro music: " << mp3file.str() );
1377
1378 #if defined( __CYGWIN__ )
1379             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1380 #elif defined( WIN32 )
1381             string command = "start /m " + mp3file.str();
1382 #else
1383             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1384 #endif
1385
1386             system ( command.c_str() );
1387         }
1388 #endif
1389
1390         idle_state++;
1391     } else if ( idle_state == 2 ) {
1392         // These are a few miscellaneous things that aren't really
1393         // "subsystems" but still need to be initialized.
1394
1395 #ifdef USE_GLIDE
1396         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1397             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1398         }
1399 #endif
1400
1401         idle_state++;
1402     } else if ( idle_state == 3 ) {
1403         // This is the top level init routine which calls all the
1404         // other subsystem initialization routines.  If you are adding
1405         // a subsystem to flightgear, its initialization call should
1406         // located in this routine.
1407         if( !fgInitSubsystems()) {
1408             SG_LOG( SG_GENERAL, SG_ALERT,
1409                 "Subsystem initializations failed ..." );
1410             exit(-1);
1411         }
1412
1413         idle_state++;
1414     } else if ( idle_state == 4 ) {
1415         // setup OpenGL view parameters
1416         fgInitVisuals();
1417
1418         // Read the list of available aircrafts
1419         fgReadAircraft();
1420
1421         idle_state++;
1422     } else if ( idle_state == 5 ) {
1423
1424         idle_state++;
1425     } else if ( idle_state == 6 ) {
1426         // sleep(1);
1427         idle_state = 1000;
1428
1429         SG_LOG( SG_GENERAL, SG_INFO, "Panel visible = " << fgPanelVisible() );
1430         fgReshape( fgGetInt("/sim/startup/xsize"),
1431                fgGetInt("/sim/startup/ysize") );
1432     }
1433
1434     if ( idle_state == 1000 ) {
1435         // We've finished all our initialization steps, from now on we
1436         // run the main loop.
1437
1438         glutIdleFunc(fgMainLoop);
1439     } else {
1440         if ( fgGetBool("/sim/startup/splash-screen") ) {
1441             fgSplashUpdate(0.0, 1.0);
1442         }
1443     }
1444 }
1445
1446 // options.cxx needs to see this for toggle_panel()
1447 // Handle new window size or exposure
1448 void fgReshape( int width, int height ) {
1449     int view_h;
1450
1451     if ( (!fgGetBool("/sim/virtual-cockpit"))
1452          && fgPanelVisible() && idle_state == 1000 ) {
1453         view_h = (int)(height * (globals->get_current_panel()->getViewHeight() -
1454                              globals->get_current_panel()->getYOffset()) / 768.0);
1455     } else {
1456         view_h = height;
1457     }
1458
1459     // for all views
1460     FGViewMgr *viewmgr = globals->get_viewmgr();
1461     for ( int i = 0; i < viewmgr->size(); ++i ) {
1462       viewmgr->get_view(i)->
1463         set_aspect_ratio((float)view_h / (float)width);
1464     }
1465
1466     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1467
1468     fgSetInt("/sim/startup/xsize", width);
1469     fgSetInt("/sim/startup/ysize", height);
1470     guiInitMouse(width, height);
1471
1472     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1473                viewmgr->get_current_view()->get_v_fov() );
1474
1475     fgHUDReshape();
1476
1477 #ifdef FG_USE_CLOUDS_3D
1478     sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
1479                         viewmgr->get_current_view()->get_v_fov() );
1480 #endif
1481
1482 }
1483
1484 // Initialize GLUT and define a main window
1485 static bool fgGlutInit( int *argc, char **argv ) {
1486
1487 #if !defined( macintosh )
1488     // GLUT will extract all glut specific options so later on we only
1489     // need wory about our own.
1490     glutInit(argc, argv);
1491 #endif
1492
1493     // Define Display Parameters. Clouds3d works best with --bpp32 option
1494     if ( fgGetBool("/sim/rendering/clouds3d") ) {
1495         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_ALPHA );
1496     } else {
1497         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1498     }
1499
1500     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1501             fgGetInt("/sim/startup/xsize") << "x"
1502             << fgGetInt("/sim/startup/ysize") );
1503
1504     // Define initial window size
1505     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1506                     fgGetInt("/sim/startup/ysize") );
1507
1508     // Initialize windows
1509     if ( !fgGetBool("/sim/startup/game-mode")) {
1510         // Open the regular window
1511         glutCreateWindow("FlightGear");
1512 #ifndef GLUT_WRONG_VERSION
1513     } else {
1514         // Open the cool new 'game mode' window
1515         char game_mode_str[256];
1516 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1517 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1518 #ifndef ENUM_CURRENT_SETTINGS
1519 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1520 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1521 #endif
1522
1523         DEVMODE dm;
1524         dm.dmSize = sizeof(DEVMODE);
1525         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1526         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1527         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1528         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1529                             fgGetInt("/sim/startup/ysize") );
1530         sprintf( game_mode_str, "%dx%d:%d@%d",
1531                      dm.dmPelsWidth,
1532                      dm.dmPelsHeight,
1533                      dm.dmBitsPerPel,
1534                      dm.dmDisplayFrequency );
1535 #else
1536         // Open the cool new 'game mode' window
1537         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1538              fgGetInt("/sim/startup/xsize"),
1539              fgGetInt("/sim/startup/ysize"),
1540              fgGetInt("/sim/rendering/bits-per-pixel"));
1541
1542 #endif // HAVE_WINDOWS_H
1543         SG_LOG( SG_GENERAL, SG_INFO,
1544             "game mode params = " << game_mode_str );
1545         glutGameModeString( game_mode_str );
1546         glutEnterGameMode();
1547 #endif // GLUT_WRONG_VERSION
1548     }
1549
1550     // This seems to be the absolute earliest in the init sequence
1551     // that these calls will return valid info.  Too bad it's after
1552     // we've already created and sized out window. :-(
1553     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1554     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1555     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1556     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1557
1558     GLint tmp;
1559     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1560     general.set_glMaxTexSize( tmp );
1561     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1562
1563     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1564     general.set_glDepthBits( tmp );
1565     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1566
1567     return true;
1568 }
1569
1570
1571 // Initialize GLUT event handlers
1572 static bool fgGlutInitEvents( void ) {
1573     // call fgReshape() on window resizes
1574     glutReshapeFunc( fgReshape );
1575
1576     // keyboard and mouse callbacks are set in FGInput::init
1577
1578     // call fgMainLoop() whenever there is
1579     // nothing else to do
1580     glutIdleFunc( fgIdleFunction );
1581
1582     // draw the scene
1583     glutDisplayFunc( fgRenderFrame );
1584
1585     return true;
1586 }
1587
1588 // Main top level initialization
1589 static bool fgMainInit( int argc, char **argv ) {
1590
1591 #if defined( macintosh )
1592     freopen ("stdout.txt", "w", stdout );
1593     freopen ("stderr.txt", "w", stderr );
1594     argc = ccommand( &argv );
1595 #endif
1596
1597     // set default log levels
1598     sglog().setLogLevels( SG_ALL, SG_INFO );
1599
1600     string version;
1601 #ifdef FLIGHTGEAR_VERSION
1602     version = FLIGHTGEAR_VERSION;
1603 #else
1604     version = "unknown version";
1605 #endif
1606     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1607             << version );
1608     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1609
1610     // Allocate global data structures.  This needs to happen before
1611     // we parse command line options
1612
1613     globals = new FGGlobals;
1614
1615     // seed the random number generater
1616     sg_srandom_time();
1617
1618     SGRoute *route = new SGRoute;
1619     globals->set_route( route );
1620
1621     FGControls *controls = new FGControls;
1622     globals->set_controls( controls );
1623
1624     string_list *col = new string_list;
1625     globals->set_channel_options_list( col );
1626
1627     // Scan the config file(s) and command line options to see if
1628     // fg_root was specified (ignore all other options for now)
1629     fgInitFGRoot(argc, argv);
1630
1631     // Check for the correct base package version
1632     static char required_version[] = "0.9.2";
1633     string base_version = fgBasePackageVersion();
1634     if ( !(base_version == required_version) ) {
1635         // tell the operator how to use this application
1636
1637         cerr << endl << "Base package check failed ... " \
1638              << "Found version " << base_version << " at: " \
1639              << globals->get_fg_root() << endl;
1640         cerr << "Please upgrade to version: " << required_version << endl;
1641         exit(-1);
1642     }
1643
1644     // Initialize the Aircraft directory to "" (UIUC)
1645     aircraft_dir = "";
1646
1647     // Load the configuration parameters.  (Command line options
1648     // overrides config file options.  Config file options override
1649     // defaults.)
1650     if ( !fgInitConfig(argc, argv) ) {
1651         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1652         exit(-1);
1653     }
1654
1655     // Initialize the Window/Graphics environment.
1656     if( !fgGlutInit(&argc, argv) ) {
1657         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1658         exit(-1);
1659     }
1660
1661     // Initialize the various GLUT Event Handlers.
1662     if( !fgGlutInitEvents() ) {
1663         SG_LOG( SG_GENERAL, SG_ALERT,
1664                 "GLUT event handler initialization failed ..." );
1665         exit(-1);
1666     }
1667
1668     // Initialize plib net interface
1669     netInit( &argc, argv );
1670
1671     // Initialize ssg (from plib).  Needs to come before we do any
1672     // other ssg stuff, but after opengl/glut has been initialized.
1673     ssgInit();
1674
1675     // Initialize the user interface (we need to do this before
1676     // passing off control to glut and before fgInitGeneral to get our
1677     // fonts !!!
1678     guiInit();
1679
1680     // Read the list of available aircrafts
1681     fgReadAircraft();
1682
1683 #ifdef GL_EXT_texture_lod_bias
1684     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1685 #endif
1686
1687             // get the address of our OpenGL extensions
1688     if ( fgGetBool("/sim/rendering/distance-attenuation") )
1689     {
1690         if (SGIsOpenGLExtensionSupported("GL_EXT_point_parameters") ) {
1691             glPointParameterIsSupported = true;
1692             glPointParameterfPtr = (glPointParameterfProc)
1693                                    SGLookupFunction("glPointParameterfEXT");
1694             glPointParameterfvPtr = (glPointParameterfvProc)
1695                                     SGLookupFunction("glPointParameterfvEXT");
1696
1697         } else if ( SGIsOpenGLExtensionSupported("GL_ARB_point_parameters") ) {
1698             glPointParameterIsSupported = true;
1699             glPointParameterfPtr = (glPointParameterfProc)
1700                                    SGLookupFunction("glPointParameterfARB");
1701             glPointParameterfvPtr = (glPointParameterfvProc)
1702                                     SGLookupFunction("glPointParameterfvARB");
1703         } else
1704             glPointParameterIsSupported = false;
1705    }
1706
1707     // based on the requested presets, calculate the true starting
1708     // lon, lat
1709     fgInitNav();
1710     fgInitPosition();
1711
1712     SGTime *t = fgInitTime();
1713     globals->set_time_params( t );
1714
1715     // Do some quick general initializations
1716     if( !fgInitGeneral()) {
1717         SG_LOG( SG_GENERAL, SG_ALERT,
1718             "General initializations failed ..." );
1719         exit(-1);
1720     }
1721
1722     SGPath modelpath( globals->get_fg_root() );
1723     ssgModelPath( (char *)modelpath.c_str() );
1724
1725     ////////////////////////////////////////////////////////////////////
1726     // Initialize the property-based built-in commands
1727     ////////////////////////////////////////////////////////////////////
1728     fgInitCommands();
1729
1730     ////////////////////////////////////////////////////////////////////
1731     // Initialize the material manager
1732     ////////////////////////////////////////////////////////////////////
1733     globals->set_matlib( new SGMaterialLib );
1734
1735     globals->set_model_lib(new SGModelLib);
1736
1737     ////////////////////////////////////////////////////////////////////
1738     // Initialize the TG scenery subsystem.
1739     ////////////////////////////////////////////////////////////////////
1740     globals->set_scenery( new FGScenery );
1741     globals->get_scenery()->init();
1742     globals->get_scenery()->bind();
1743     globals->set_tile_mgr( new FGTileMgr );
1744
1745     ////////////////////////////////////////////////////////////////////
1746     // Initialize the general model subsystem.
1747     ////////////////////////////////////////////////////////////////////
1748     globals->set_model_mgr(new FGModelMgr);
1749     globals->get_model_mgr()->init();
1750     globals->get_model_mgr()->bind();
1751
1752     ////////////////////////////////////////////////////////////////////
1753     // Initialize the 3D aircraft model subsystem (has a dependency on
1754     // the scenery subsystem.)
1755     ////////////////////////////////////////////////////////////////////
1756     globals->set_aircraft_model(new FGAircraftModel);
1757     globals->get_aircraft_model()->init();
1758     globals->get_aircraft_model()->bind();
1759
1760     ////////////////////////////////////////////////////////////////////
1761     // Initialize the view manager subsystem.
1762     ////////////////////////////////////////////////////////////////////
1763     FGViewMgr *viewmgr = new FGViewMgr;
1764     globals->set_viewmgr( viewmgr );
1765     viewmgr->init();
1766     viewmgr->bind();
1767
1768
1769     // Initialize the sky
1770     SGPath ephem_data_path( globals->get_fg_root() );
1771     ephem_data_path.append( "Astro" );
1772     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1773     ephem->update( globals->get_time_params()->getMjd(),
1774                globals->get_time_params()->getLst(),
1775                0.0 );
1776     globals->set_ephem( ephem );
1777
1778                             // TODO: move to environment mgr
1779     thesky = new SGSky;
1780     SGPath texture_path(globals->get_fg_root());
1781     texture_path.append("Textures");
1782     texture_path.append("Sky");
1783     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1784         SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1785         thesky->add_cloud_layer(layer);
1786     }
1787
1788
1789     SGPath sky_tex_path( globals->get_fg_root() );
1790     sky_tex_path.append( "Textures" );
1791     sky_tex_path.append( "Sky" );
1792     thesky->texture_path( sky_tex_path.str() );
1793
1794     // The sun and moon diameters are scaled down numbers of the
1795     // actual diameters. This was needed to fit bot the sun and the
1796     // moon within the distance to the far clip plane.
1797     // Moon diameter:    3,476 kilometers
1798     // Sun diameter: 1,390,000 kilometers
1799     thesky->build( 80000.0, 80000.0,
1800                    463.3, 361.8,
1801                    globals->get_ephem()->getNumPlanets(),
1802                    globals->get_ephem()->getPlanets(),
1803                    globals->get_ephem()->getNumStars(),
1804                    globals->get_ephem()->getStars() );
1805
1806     // Initialize MagVar model
1807     SGMagVar *magvar = new SGMagVar();
1808     globals->set_mag( magvar );
1809
1810
1811                                 // kludge to initialize mag compass
1812                                 // (should only be done for in-flight
1813                                 // startup)
1814     // update magvar model
1815     globals->get_mag()->update( fgGetDouble("/position/longitude-deg")
1816                                 * SGD_DEGREES_TO_RADIANS,
1817                                 fgGetDouble("/position/latitude-deg")
1818                                 * SGD_DEGREES_TO_RADIANS,
1819                                 fgGetDouble("/position/altitude-ft")
1820                                 * SG_FEET_TO_METER,
1821                                 globals->get_time_params()->getJD() );
1822     double var = globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES;
1823     fgSetDouble("/instrumentation/heading-indicator/offset-deg", -var);
1824
1825     // airport = new ssgBranch;
1826     // airport->setName( "Airport Lighting" );
1827     // lighting->addKid( airport );
1828
1829     // ADA
1830     fgLoadDCS();
1831     // ADA
1832
1833 #ifdef FG_NETWORK_OLK
1834     // Do the network intialization
1835     if ( fgGetBool("/sim/networking/network-olk") ) {
1836         printf("Multipilot mode %s\n",
1837                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1838     }
1839 #endif
1840
1841     // build our custom render states
1842     fgBuildRenderStates();
1843
1844     // pass control off to the master GLUT event handler
1845     glutMainLoop();
1846
1847     // we never actually get here ... but to avoid compiler warnings,
1848     // etc.
1849     return false;
1850 }
1851
1852
1853 // $$$ end - added VS Renganathan, 15 Oct 2K
1854 //         - added Venky         , 12 Nov 2K
1855
1856 #if defined(__linux__) && defined(__i386__)
1857
1858 static void handleFPE (int);
1859
1860 static void
1861 initFPE ()
1862 {
1863     fpu_control_t fpe_flags = 0;
1864     _FPU_GETCW(fpe_flags);
1865 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1866 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1867 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1868 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1869 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1870 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1871     _FPU_SETCW(fpe_flags);
1872     signal(SIGFPE, handleFPE);
1873 }
1874
1875 static void
1876 handleFPE (int num)
1877 {
1878   initFPE();
1879   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1880 }
1881 #endif
1882
1883 #ifdef __APPLE__
1884
1885 typedef struct
1886 {
1887   int  lo;
1888   int  hi;
1889 } PSN;
1890
1891 extern "C" {
1892   short CPSGetCurrentProcess(PSN *psn);
1893   short CPSSetProcessName (PSN *psn, char *processname);
1894   short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
1895   short CPSSetFrontProcess(PSN *psn);
1896 };
1897
1898 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
1899
1900 #endif
1901
1902 // Main entry point; catch any exceptions that have made it this far.
1903 int main ( int argc, char **argv ) {
1904
1905     // Enable floating-point exceptions for Linux/x86
1906 #if defined(__linux__) && defined(__i386__)
1907     initFPE();
1908 #endif
1909
1910     // Enable floating-point exceptions for Windows
1911 #if defined( _MSC_VER ) && defined( DEBUG )
1912     // Christian, we should document what this does
1913     _control87( _EM_INEXACT, _MCW_EM );
1914 #endif
1915
1916 #if defined( HAVE_BC5PLUS )
1917     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1918 #endif
1919
1920     // Keyboard focus hack
1921 #ifdef __APPLE__
1922     {
1923       PSN psn;
1924
1925       glutInit (&argc, argv);
1926
1927       CPSGetCurrentProcess(&psn);
1928       CPSSetProcessName(&psn, "FlightGear");
1929       CPSEnableFG(&psn);
1930       CPSSetFrontProcess(&psn);
1931     }
1932 #endif
1933
1934     // FIXME: add other, more specific
1935     // exceptions.
1936     try {
1937         fgMainInit(argc, argv);
1938     } catch (sg_throwable &t) {
1939                             // We must use cerr rather than
1940                             // logging, since logging may be
1941                             // disabled.
1942         cerr << "Fatal error: " << t.getFormattedMessage()
1943              << "\n (received from " << t.getOrigin() << ')' << endl;
1944         exit(1);
1945     }
1946
1947     return 0;
1948 }
1949
1950
1951 void fgLoadDCS(void) {
1952
1953     ssgEntity *ship_obj = NULL;
1954
1955     char obj_filename[25];
1956
1957     for ( int k = 0; k < 32; k++ ) {
1958         ship_pos[k]=NULL;
1959     }
1960
1961     SGPath tile_path( globals->get_fg_root());
1962     tile_path.append( "Scenery" );
1963     tile_path.append( "Objects.txt" );
1964     sg_gzifstream in( tile_path.str() );
1965     if ( ! in.is_open() ) {
1966         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1967     } else {
1968
1969         SGPath modelpath( globals->get_fg_root() );
1970         modelpath.append( "Models" );
1971         modelpath.append( "Geometry" );
1972
1973         SGPath texturepath( globals->get_fg_root() );
1974         texturepath.append( "Models" );
1975         texturepath.append( "Textures" );
1976
1977         ssgModelPath( (char *)modelpath.c_str() );
1978         ssgTexturePath( (char *)texturepath.c_str() );
1979
1980         ship_sel = new ssgSelector;
1981
1982         char c;
1983         while ( ! in.eof() ) {
1984             in >> ::skipws;
1985             if ( in.get( c ) && c == '#' ) {
1986                 in >> skipeol;
1987             } else {
1988                 in.putback(c);
1989                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1990                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1991                    int chj=getchar();*/
1992
1993                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1994                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1995
1996                 ship_pos[objc] = new ssgTransform;
1997
1998                 // type "repeat" in objects.txt to load one more
1999                 // instance of the last object.
2000
2001                 if ( strcmp(obj_filename,"repeat") != 0) {
2002                     ship_obj =
2003                       globals->get_model_lib()->load_model( globals->get_fg_root(), obj_filename, globals->get_props(), globals->get_sim_time_sec() );
2004                 }
2005
2006                 if ( ship_obj != NULL ) {
2007                                 ship_obj->setName(obj_filename);
2008                             if (objc == 0)
2009                                         ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
2010                                 else
2011                                         ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
2012                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
2013                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
2014                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
2015                             << obj_filename );
2016                 } else {
2017                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
2018                             << obj_filename );
2019                 }
2020
2021                             // temporary hack for deck lights - ultimately should move to PLib (when??)
2022                             //const char *extn = file_extension ( obj_filename ) ;
2023                             if ( objc == 1 ){
2024                                 // ssgVertexArray *lights = new ssgVertexArray( 100 );
2025                                 ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
2026                                 ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
2027                                 ssgVertexArray *lightdir = new ssgVertexArray( 100 );
2028                                 int ltype[500], light_type = 0;
2029                                 static int ltcount = 0;
2030                                 string token;
2031                                 sgVec3 rway_dir,rway_normal,lightpt;
2032                                 Point3D node;
2033                                 modelpath.append(obj_filename);
2034                                 sg_gzifstream in1( modelpath.str() );
2035                                 if ( ! in1.is_open() ) {
2036                                         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
2037                                 } else {
2038                                         while ( ! in1.eof() ) {
2039                                                         in1 >> ::skipws;
2040                                                 if ( in1.get( c ) && c == '#' ) {
2041                                                         in1 >> skipeol;
2042                                                 } else {
2043                                                         in1.putback(c);
2044                                                         in1 >> token;
2045                                                         //cout << token << endl;
2046                                                         if ( token == "runway" ) {
2047                                                                 in1 >> node;
2048                                                                 sgSetVec3 (rway_dir, node[0], node[1], node[2] );
2049                                                         } else if ( token == "edgelight" ) {
2050                                                                 in1 >> node;
2051                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2052                                                                 light_type = 1;
2053                                                         } else if ( token == "taxi" ) {
2054                                                                 in1 >> node;
2055                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2056                                                                 light_type = 2;
2057                                                         } else if ( token == "vasi" ) {
2058                                                                 in1 >> node;
2059                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2060                                                                 light_type = 3;
2061                                                         } else if ( token == "threshold" ) {
2062                                                                 in1 >> node;
2063                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2064                                                                 light_type = 4;
2065                                                         } else if ( token == "rabbit" ) {
2066                                                                 in1 >> node;
2067                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2068                                                                 light_type = 5;
2069                                                         } else if ( token == "ols" ) {
2070                                                                 in1 >> node;
2071                                                                 sgSetVec3 (rway_ols, node[0], node[1], node[2] );
2072                                                                 light_type = 6;
2073                                                         } else if ( token == "red" ) {
2074                                                                 in1 >> node;
2075                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2076                                                                 light_type = 7;
2077                                                         } else if ( token == "green" ) {
2078                                                                 in1 >> node;
2079                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2080                                                                 light_type = 8;
2081                                                         } else if ( token == "lp" ) {
2082                                                                 in1 >> node;
2083                                                                 sgSetVec3 (lightpt, node[0], node[1], node[2] );
2084                                                                 lightpoints->add( lightpt );
2085                                                                 lightnormals->add( rway_normal );
2086                                                                 lightdir->add( rway_dir );
2087                                                                 ltype[ltcount]= light_type;
2088                                                                 ltcount++;
2089                                                         }
2090                                                         if (in1.eof()) break;
2091                                                 }
2092                                         }  //while
2093
2094 #if 0
2095                                         if ( lightpoints->getNum() ) {
2096                                                 ssgBranch *lightpoints_branch;
2097                                                 long int dummy = -999;
2098                                                 dummy_tile = new FGTileEntry((SGBucket)dummy);
2099                                                 dummy_tile->lightmaps_sequence = new ssgSelector;
2100                                                 dummy_tile->ols_transform = new ssgTransform;
2101
2102                                                 // call function to generate the runway lights
2103                                                 lightpoints_branch =
2104                                                 dummy_tile->gen_runway_lights( lightpoints, lightnormals,
2105                                                                                                                         lightdir, ltype);
2106                                                 lightpoints_brightness->addKid(lightpoints_branch);
2107                                                 lightpoints_transform->addKid(lightpoints_brightness);
2108                                             //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
2109                                                 lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
2110                                                 lightpoints_transform->ref();
2111                                                 globals->get_scenery()->get_gnd_lights_root()->addKid( lightpoints_transform );
2112                                         }
2113 #endif
2114                                 } //if in1
2115                 } //if objc
2116                             // end hack for deck lights
2117
2118                 objc++;
2119
2120                 if (in.eof()) break;
2121             }
2122         } // while
2123
2124         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
2125
2126         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
2127     }
2128
2129     return;
2130  }
2131
2132
2133 void fgUpdateDCS (void) {
2134
2135     // double eye_lat,eye_lon,eye_alt;
2136     // static double obj_head;
2137     double sl_radius,obj_latgc;
2138     // float nresultmat[4][4];
2139     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
2140     double bz[3];
2141
2142     // Instantaneous Geodetic Lat/Lon/Alt of moving object
2143     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
2144
2145     // Deck should be the first object in objects.txt in case of fdm=ada
2146
2147     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
2148             if ((fdm->get_iaux(1))==1)
2149             {
2150                     obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
2151                     obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
2152                     obj_alt[1] = fdm->get_daux(3);
2153                     obj_pitch[1] = fdm->get_faux(1);
2154                     obj_roll[1] = fdm->get_faux(2);
2155             }
2156     }
2157
2158     for ( int m = 0; m < objc; m++ ) {
2159         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
2160         //int v=getchar();
2161
2162         //Geodetic to Geocentric angles for rotation
2163         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
2164
2165         //moving object gbs-posn in cartesian coords
2166         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
2167         Point3D obj_pos = sgGeodToCart( obj_posn );
2168
2169         // Translate moving object w.r.t eye
2170         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
2171         bz[0]=Objtrans.x();
2172         bz[1]=Objtrans.y();
2173         bz[2]=Objtrans.z();
2174
2175        // rotate dynamic objects for lat,lon & alt and other motion about its axes
2176
2177         sgMat4 sgTRANS;
2178         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
2179
2180         sgVec3 ship_fwd,ship_rt,ship_up;
2181         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
2182         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
2183         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
2184
2185         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
2186         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
2187         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
2188         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
2189         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
2190         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
2191
2192         sgMat4 sgTUX;
2193         sgCopyMat4( sgTUX, sgROT_hdg );
2194         sgPostMultMat4( sgTUX, sgROT_pitch );
2195         sgPostMultMat4( sgTUX, sgROT_roll );
2196         sgPostMultMat4( sgTUX, sgROT_lat );
2197         sgPostMultMat4( sgTUX, sgROT_lon );
2198         sgPostMultMat4( sgTUX, sgTRANS );
2199
2200         sgCoord shippos;
2201         sgSetCoord(&shippos, sgTUX );
2202         ship_pos[m]->setTransform( &shippos );
2203         // temporary hack for deck lights - ultimately should move to PLib (when ??)
2204         if (m == 1) {
2205             if (lightpoints_transform) {
2206                     lightpoints_transform->setTransform( &shippos );
2207                     float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
2208                     if ( sun_angle > 89 ) {
2209                             lightpoints_brightness->select(0x01);
2210                     } else {
2211                             lightpoints_brightness->select(0x00);
2212                     }
2213             }
2214
2215             float elev;
2216             sgVec3 rp,to;
2217             float *vp;
2218             float alt;
2219             float ref_elev;
2220             sgXformPnt3( rp, rway_ols, sgTUX );
2221             vp = globals->get_current_view()->get_view_pos();
2222             to[0] = rp[0]-vp[0];
2223             to[1] = rp[1]-vp[1];
2224             to[2] = rp[2]-vp[2];
2225             float dist = sgLengthVec3( to );
2226             alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
2227
2228             elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
2229
2230             ref_elev = elev - 3.75; // +ve above, -ve below
2231
2232             unsigned int sel;
2233             sel = 0xFF;
2234 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2235 //              if (ref_elev > 0.51) sel = 0x21;
2236 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
2237 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
2238 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
2239 //              if (ref_elev < -0.51) sel = 0x30;
2240 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2241             // dummy_tile->lightmaps_sequence->select(sel);
2242
2243             sgVec3 up;
2244             sgCopyVec3 (up, ship_up);
2245             if (dist > 750)
2246                     sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
2247             else
2248                     sgScaleVec3 (up, 4.0*ref_elev);
2249             // dummy_tile->ols_transform->setTransform(up);
2250             //cout << "ref_elev  " << ref_elev << endl;
2251         }
2252     // end hack for deck lights
2253
2254     }
2255     if ( ship_sel != NULL ) {
2256         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2257     }
2258 }
2259
2260 // $$$ end - added VS Renganathan, 15 Oct 2K
2261 //           added Venky         , 12 Nov 2K