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 #include <simgear/compiler.h>
  29
  30 #if defined(__linux__) && defined(__i386__)
  31 #  include <fpu_control.h>
  32 #  include <signal.h>
  33 #endif
  34
  35 #ifdef SG_MATH_EXCEPTION_CLASH
  36 #  include <math.h>
  37 #endif
  38
  39 #ifdef HAVE_WINDOWS_H
  40 #  include <windows.h>
  41 #  include <float.h>
  42 #endif
  43
  44 #include <plib/ssg.h>
  45 #include <plib/pu.h>
  46 #include <plib/netSocket.h>
  47
  48 #include <simgear/screen/extensions.hxx>
  49 #include <simgear/scene/material/matlib.hxx>
  50 #include <simgear/props/props.hxx>
  51 #include <simgear/scene/sky/sky.hxx>
  52 #include <simgear/timing/sg_time.hxx>
  53 #include <simgear/scene/model/animation.hxx>
  54 #include <simgear/ephemeris/ephemeris.hxx>
  55 #include <simgear/scene/model/placement.hxx>
  56 #include <simgear/math/sg_random.h>
  57 #include <simgear/route/route.hxx>
  58 #include <simgear/scene/model/modellib.hxx>
  59
  60 #ifdef FG_USE_CLOUDS_3D
  61 #  include <simgear/scene/sky/clouds3d/SkySceneLoader.hpp>
  62 #  include <simgear/scene/sky/clouds3d/SkyUtil.hpp>
  63 #endif
  64
  65 #include <Include/general.hxx>
  66 #include <Scenery/tileentry.hxx>
  67 #include <Time/FGEventMgr.hxx>
  68 #include <Time/light.hxx>
  69 #include <Time/light.hxx>
  70 #include <Aircraft/aircraft.hxx>
  71 #include <Cockpit/panel.hxx>
  72 #include <Cockpit/cockpit.hxx>
  73 #include <Cockpit/radiostack.hxx>
  74 #include <Cockpit/hud.hxx>
  75 #include <Model/panelnode.hxx>
  76 #include <Model/modelmgr.hxx>
  77 #include <Model/acmodel.hxx>
  78 #include <Scenery/scenery.hxx>
  79 #include <Scenery/tilemgr.hxx>
  80 #include <FDM/flight.hxx>
  81 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
  82 #include <FDM/ADA.hxx>
  83 #include <ATC/ATCdisplay.hxx>
  84 #include <ATC/ATCmgr.hxx>
  85 #include <ATC/AIMgr.hxx>
  86 #include <Autopilot/newauto.hxx>
  87 #include <Replay/replay.hxx>
  88 #include <Time/tmp.hxx>
  89 #include <Time/fg_timer.hxx>
  90 #include <Environment/environment_mgr.hxx>
  91
  92 #ifdef FG_NETWORK_OLK
  93 #include <NetworkOLK/network.h>
  94 #endif
  95
  96 #ifdef FG_MPLAYER_AS
  97 #include <MultiPlayer/multiplaytxmgr.hxx>
  98 #include <MultiPlayer/multiplayrxmgr.hxx>
  99 #endif
 100
 101 #include "splash.hxx"
 102 #include "fg_commands.hxx"
 103 #include "fg_io.hxx"
 104 #include "main.hxx"
 105
 106 float default_attenuation[3] = {1.0, 0.0, 0.0};
 107 ssgSelector *ship_sel=NULL;
 108 // upto 32 instances of a same object can be loaded.
 109 ssgTransform *ship_pos[32];
 110 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 111 int objc=0;
 112 ssgSelector *lightpoints_brightness = new ssgSelector;
 113 ssgTransform *lightpoints_transform = new ssgTransform;
 114 FGTileEntry *dummy_tile;
 115 sgVec3 rway_ols;
 116 // ADA
 117 // Clip plane settings...
 118 float scene_nearplane = 0.5f;
 119 float scene_farplane = 120000.0f;
 120
 121 static double delta_time_sec = 0.0;
 122
 123 glPointParameterfProc glPointParameterfPtr = 0;
 124 glPointParameterfvProc glPointParameterfvPtr = 0;
 125 bool glPointParameterIsSupported = false;
 126
 127
 128 #ifdef FG_WEATHERCM
 129 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 130 #endif
 131
 132 #ifdef macintosh
 133 #  include <console.h>          // -dw- for command line dialog
 134 #endif
 135
 136 FGEventMgr global_events;
 137
 138 // This is a record containing a bit of global housekeeping information
 139 FGGeneral general;
 140
 141 // Specify our current idle function state.  This is used to run all
 142 // our initializations out of the glutIdleLoop() so that we can get a
 143 // splash screen up and running right away.
 144 static int idle_state = 0;
 145 static long global_multi_loop;
 146
 147 // fog constants.  I'm a little nervous about putting actual code out
 148 // here but it seems to work (?)
 149 static const double m_log01 = -log( 0.01 );
 150 static const double sqrt_m_log01 = sqrt( m_log01 );
 151 static GLfloat fog_exp_density;
 152 static GLfloat fog_exp2_density;
 153 static GLfloat rwy_exp2_punch_through;
 154 static GLfloat taxi_exp2_punch_through;
 155 static GLfloat ground_exp2_punch_through;
 156
 157 #ifdef FG_NETWORK_OLK
 158 ssgSelector *fgd_sel = NULL;
 159 ssgTransform *fgd_pos = NULL;
 160 #endif
 161
 162 // Sky structures
 163 SGSky *thesky;
 164
 165 #ifdef FG_USE_CLOUDS_3D
 166   SkySceneLoader *sgClouds3d;
 167   bool _bcloud_orig = true;
 168 #endif
 169
 170 // hack
 171 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 172 {
 173   {  1.0f,  0.0f,  0.0f,  0.0f },
 174   {  0.0f,  0.0f, -1.0f,  0.0f },
 175   {  0.0f,  1.0f,  0.0f,  0.0f },
 176   {  0.0f,  0.0f,  0.0f,  1.0f }
 177 };
 178
 179 // The following defines flightgear options. Because glutlib will also
 180 // want to parse its own options, those options must not be included here
 181 // or they will get parsed by the main program option parser. Hence case
 182 // is significant for any option added that might be in conflict with
 183 // glutlib's parser.
 184 //
 185 // glutlib parses for:
 186 //    -display
 187 //    -direct   (invalid in Win32)
 188 //    -geometry
 189 //    -gldebug
 190 //    -iconized
 191 //    -indirect (invalid in Win32)
 192 //    -synce
 193 //
 194 // Note that glutlib depends upon strings while this program's
 195 // option parser wants only initial characters followed by numbers
 196 // or pathnames.
 197 //
 198
 199
 200 ssgSimpleState *cloud3d_imposter_state;
 201 ssgSimpleState *default_state;
 202 ssgSimpleState *hud_and_panel;
 203 ssgSimpleState *menus;
 204
 205 SGTimeStamp last_time_stamp;
 206 SGTimeStamp current_time_stamp;
 207
 208
 209 void fgBuildRenderStates( void ) {
 210     default_state = new ssgSimpleState;
 211     default_state->ref();
 212     default_state->disable( GL_TEXTURE_2D );
 213     default_state->enable( GL_CULL_FACE );
 214     default_state->enable( GL_COLOR_MATERIAL );
 215     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 216     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 217     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 218     default_state->disable( GL_BLEND );
 219     default_state->disable( GL_ALPHA_TEST );
 220     default_state->disable( GL_LIGHTING );
 221
 222     cloud3d_imposter_state = new ssgSimpleState;
 223     cloud3d_imposter_state->ref();
 224     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 225     cloud3d_imposter_state->enable( GL_CULL_FACE );
 226     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 227     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 228     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 229     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 230     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 231     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 232     cloud3d_imposter_state->enable( GL_BLEND );
 233     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 234     cloud3d_imposter_state->disable( GL_LIGHTING );
 235
 236     hud_and_panel = new ssgSimpleState;
 237     hud_and_panel->ref();
 238     hud_and_panel->disable( GL_CULL_FACE );
 239     hud_and_panel->disable( GL_TEXTURE_2D );
 240     hud_and_panel->disable( GL_LIGHTING );
 241     hud_and_panel->enable( GL_BLEND );
 242
 243     menus = new ssgSimpleState;
 244     menus->ref();
 245     menus->disable( GL_CULL_FACE );
 246     menus->disable( GL_TEXTURE_2D );
 247     menus->enable( GL_BLEND );
 248 }
 249
 250
 251 // fgInitVisuals() -- Initialize various GL/view parameters
 252 void fgInitVisuals( void ) {
 253     fgLIGHT *l;
 254
 255     l = &cur_light_params;
 256
 257 #ifndef GLUT_WRONG_VERSION
 258     // Go full screen if requested ...
 259     if ( fgGetBool("/sim/startup/fullscreen") ) {
 260         glutFullScreen();
 261     }
 262 #endif
 263
 264     // If enabled, normal vectors specified with glNormal are scaled
 265     // to unit length after transformation.  Enabling this has
 266     // performance implications.  See the docs for glNormal.
 267     // glEnable( GL_NORMALIZE );
 268
 269     glEnable( GL_LIGHTING );
 270     glEnable( GL_LIGHT0 );
 271     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 272
 273     sgVec3 sunpos;
 274     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 275     ssgGetLight( 0 ) -> setPosition( sunpos );
 276
 277     glFogi (GL_FOG_MODE, GL_EXP2);
 278     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 279          (!fgGetBool("/sim/rendering/shading"))) {
 280         // if fastest fog requested, or if flat shading force fastest
 281         glHint ( GL_FOG_HINT, GL_FASTEST );
 282     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 283         glHint ( GL_FOG_HINT, GL_NICEST );
 284     }
 285     if ( fgGetBool("/sim/rendering/wireframe") ) {
 286         // draw wire frame
 287         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 288     }
 289
 290     // This is the default anyways, but it can't hurt
 291     glFrontFace ( GL_CCW );
 292
 293     // Just testing ...
 294     // glEnable(GL_POINT_SMOOTH);
 295     // glEnable(GL_LINE_SMOOTH);
 296     // glEnable(GL_POLYGON_SMOOTH);
 297 }
 298
 299
 300 // For HiRes screen Dumps using Brian Pauls TR Library
 301 void trRenderFrame( void ) {
 302
 303     if ( fgPanelVisible() ) {
 304         GLfloat height = fgGetInt("/sim/startup/ysize");
 305         GLfloat view_h =
 306             (globals->get_current_panel()->getViewHeight() - globals->get_current_panel()->getYOffset())
 307             * (height / 768.0) + 1;
 308         glTranslatef( 0.0, view_h, 0.0 );
 309     }
 310
 311     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 312     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 313
 314     fgLIGHT *l = &cur_light_params;
 315
 316     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 317                  l->adj_fog_color[2], l->adj_fog_color[3]);
 318
 319     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 320
 321     // set the opengl state to known default values
 322     default_state->force();
 323
 324     glEnable( GL_FOG );
 325     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 326     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 327     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 328
 329     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 330     // we only update GL_AMBIENT for our lights we will never get
 331     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 332     // explicitely to black.
 333     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 334     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 335
 336     if (fgGetBool("/sim/rendering/specular-highlight")) {
 337         glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SEPARATE_SPECULAR_COLOR);
 338     } else {
 339         glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL, GL_SINGLE_COLOR);
 340     }
 341
 342     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 343
 344     // texture parameters
 345     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 346     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 347
 348     // we need a white diffuse light for the phase of the moon
 349     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 350     thesky->preDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 351
 352     // draw the ssg scene
 353     // return to the desired diffuse color
 354     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 355     glEnable( GL_DEPTH_TEST );
 356     ssgSetNearFar( scene_nearplane, scene_farplane );
 357     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 358
 359     // draw the lights
 360     glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 361     ssgSetNearFar( scene_nearplane, scene_farplane );
 362     ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 363
 364     ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 365
 366     if (fgGetBool("/environment/clouds/status"))
 367         thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 368
 369     globals->get_model_mgr()->draw();
 370     globals->get_aircraft_model()->draw();
 371 }
 372
 373
 374 // Update all Visuals (redraws anything graphics related)
 375 void fgRenderFrame() {
 376     bool draw_otw = fgGetBool("/sim/rendering/draw-otw");
 377     bool skyblend = fgGetBool("/sim/rendering/skyblend");
 378     bool enhanced_lighting = fgGetBool("/sim/rendering/enhanced-lighting");
 379     bool distance_attenuation = fgGetBool("/sim/rendering/distance-attenuation");
 380
 381     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 382     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 383
 384     // Process/manage pending events
 385     global_events.update( delta_time_sec );
 386
 387     // static const SGPropertyNode *longitude
 388     //     = fgGetNode("/position/longitude-deg");
 389     // static const SGPropertyNode *latitude
 390     //     = fgGetNode("/position/latitude-deg");
 391     // static const SGPropertyNode *altitude
 392     //     = fgGetNode("/position/altitude-ft");
 393     static const SGPropertyNode *groundlevel_nearplane
 394         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 395
 396     // Update the default (kludged) properties.
 397     fgUpdateProps();
 398
 399     FGViewer *current__view = globals->get_current_view();
 400
 401     fgLIGHT *l = &cur_light_params;
 402     static double last_visibility = -9999;
 403
 404     // update fog params
 405     double actual_visibility;
 406     if (fgGetBool("/environment/clouds/status"))
 407         actual_visibility = thesky->get_visibility();
 408     else
 409         actual_visibility = fgGetDouble("/environment/visibility-m");
 410     if ( actual_visibility != last_visibility ) {
 411         last_visibility = actual_visibility;
 412
 413         fog_exp_density = m_log01 / actual_visibility;
 414         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 415         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 416         if ( actual_visibility < 8000 ) {
 417             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 418             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 419         } else {
 420             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 421             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 422         }
 423     }
 424
 425     // double angle;
 426     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 427     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 428     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 429     // GLfloat mat_shininess[] = { 10.0 };
 430     GLbitfield clear_mask;
 431
 432     if ( idle_state != 1000 ) {
 433         // still initializing, draw the splash screen
 434         if ( fgGetBool("/sim/startup/splash-screen") ) {
 435             fgSplashUpdate(0.0, 1.0);
 436         }
 437         // Keep resetting sim time while the sim is initializing
 438         globals->set_sim_time_sec( 0.0 );
 439         SGAnimation::set_sim_time_sec( 0.0 );
 440     } else {
 441         // idle_state is now 1000 meaning we've finished all our
 442         // initializations and are running the main loop, so this will
 443         // now work without seg faulting the system.
 444
 445         // calculate our current position in cartesian space
 446         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 447
 448         // update view port
 449         fgReshape( fgGetInt("/sim/startup/xsize"),
 450                    fgGetInt("/sim/startup/ysize") );
 451
 452         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 453             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 454             cloud3d_imposter_state->force();
 455             glDisable( GL_FOG );
 456             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 457             glEnable(GL_DEPTH_TEST);
 458             glEnable(GL_BLEND);
 459             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 460
 461 #ifdef FG_USE_CLOUDS_3D
 462             if ( _bcloud_orig ) {
 463                 Point3D c = globals->get_scenery()->get_center();
 464                 sgClouds3d->Set_Cloud_Orig( &c );
 465                 _bcloud_orig = false;
 466             }
 467             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 468 #endif
 469             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 470             glDisable(GL_DEPTH_TEST);
 471         }
 472
 473         clear_mask = GL_DEPTH_BUFFER_BIT;
 474         if ( fgGetBool("/sim/rendering/wireframe") ) {
 475             clear_mask |= GL_COLOR_BUFFER_BIT;
 476         }
 477
 478         if ( skyblend ) {
 479             if ( fgGetBool("/sim/rendering/textures") ) {
 480             // glClearColor(black[0], black[1], black[2], black[3]);
 481             glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 482                          l->adj_fog_color[2], l->adj_fog_color[3]);
 483             clear_mask |= GL_COLOR_BUFFER_BIT;
 484             }
 485         } else {
 486             glClearColor(l->sky_color[0], l->sky_color[1],
 487                      l->sky_color[2], l->sky_color[3]);
 488             clear_mask |= GL_COLOR_BUFFER_BIT;
 489         }
 490         glClear( clear_mask );
 491
 492         // Tell GL we are switching to model view parameters
 493
 494         // I really should create a derived ssg node or use a call
 495         // back or something so that I can draw the sky within the
 496         // ssgCullAndDraw() function, but for now I just mimic what
 497         // ssg does to set up the model view matrix
 498         glMatrixMode(GL_MODELVIEW);
 499         glLoadIdentity();
 500         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 501
 502         // set the opengl state to known default values
 503         default_state->force();
 504
 505         // update fog params if visibility has changed
 506         double visibility_meters = fgGetDouble("/environment/visibility-m");
 507         thesky->set_visibility(visibility_meters);
 508
 509         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 510                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 511                             / (double)fgGetInt("/sim/model-hz") );
 512
 513         // Set correct opengl fog density
 514         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 515
 516         // update the sky dome
 517         if ( skyblend ) {
 518             /*
 519              SG_LOG( SG_GENERAL, SG_BULK, "thesky->repaint() sky_color = "
 520              << cur_light_params.sky_color[0] << " "
 521              << cur_light_params.sky_color[1] << " "
 522              << cur_light_params.sky_color[2] << " "
 523              << cur_light_params.sky_color[3] );
 524             SG_LOG( SG_GENERAL, SG_BULK, "    fog = "
 525              << cur_light_params.fog_color[0] << " "
 526              << cur_light_params.fog_color[1] << " "
 527              << cur_light_params.fog_color[2] << " "
 528              << cur_light_params.fog_color[3] );
 529             SG_LOG( SG_GENERAL, SG_BULK,
 530                     "    sun_angle = " << cur_light_params.sun_angle
 531              << "    moon_angle = " << cur_light_params.moon_angle );
 532             */
 533
 534             static SGSkyColor scolor;
 535
 536             scolor.sky_color   = cur_light_params.sky_color;
 537             scolor.fog_color   = cur_light_params.adj_fog_color;
 538             scolor.cloud_color = cur_light_params.cloud_color;
 539             scolor.sun_angle   = cur_light_params.sun_angle;
 540             scolor.moon_angle  = cur_light_params.moon_angle;
 541             scolor.nplanets    = globals->get_ephem()->getNumPlanets();
 542             scolor.nstars      = globals->get_ephem()->getNumStars();
 543             scolor.planet_data = globals->get_ephem()->getPlanets();
 544             scolor.star_data   = globals->get_ephem()->getStars();
 545
 546             thesky->repaint( scolor );
 547
 548             /*
 549             SG_LOG( SG_GENERAL, SG_BULK,
 550                     "thesky->reposition( view_pos = " << view_pos[0] << " "
 551              << view_pos[1] << " " << view_pos[2] );
 552             SG_LOG( SG_GENERAL, SG_BULK,
 553                     "    zero_elev = " << zero_elev[0] << " "
 554              << zero_elev[1] << " " << zero_elev[2]
 555              << " lon = " << cur_fdm_state->get_Longitude()
 556              << " lat = " << cur_fdm_state->get_Latitude() );
 557             SG_LOG( SG_GENERAL, SG_BULK,
 558                     "    sun_rot = " << cur_light_params.sun_rotation
 559              << " gst = " << SGTime::cur_time_params->getGst() );
 560             SG_LOG( SG_GENERAL, SG_BULK,
 561                  "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 562               << " sun dec = " << globals->get_ephem()->getSunDeclination()
 563               << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 564               << " moon dec = " << globals->get_ephem()->getMoonDeclination() );
 565             */
 566
 567             // The sun and moon distances are scaled down versions
 568             // of the actual distance to get both the moon and the sun
 569             // within the range of the far clip plane.
 570             // Moon distance:    384,467 kilometers
 571             // Sun distance: 150,000,000 kilometers
 572             double sun_horiz_eff, moon_horiz_eff;
 573             if (fgGetBool("/sim/rendering/horizon-effect")) {
 574             sun_horiz_eff = 0.67+pow(0.5+cos(cur_light_params.sun_angle*2)/2,0.33)/3;
 575             moon_horiz_eff = 0.67+pow(0.5+cos(cur_light_params.moon_angle*2)/2,0.33)/3;
 576             } else {
 577                sun_horiz_eff = moon_horiz_eff = 1.0;
 578             }
 579
 580             static SGSkyState sstate;
 581
 582             sstate.view_pos  = current__view->get_view_pos();
 583             sstate.zero_elev = current__view->get_zero_elev();
 584             sstate.view_up   = current__view->get_world_up();
 585             sstate.lon       = current__view->getLongitude_deg()
 586                                 * SGD_DEGREES_TO_RADIANS;
 587             sstate.lat       = current__view->getLatitude_deg()
 588                                 * SGD_DEGREES_TO_RADIANS;
 589             sstate.alt       = current__view->getAltitudeASL_ft()
 590                                 * SG_FEET_TO_METER;
 591             sstate.spin      = cur_light_params.sun_rotation;
 592             sstate.gst       = globals->get_time_params()->getGst();
 593             sstate.sun_ra    = globals->get_ephem()->getSunRightAscension();
 594             sstate.sun_dec   = globals->get_ephem()->getSunDeclination();
 595             sstate.sun_dist  = 50000.0 * sun_horiz_eff;
 596             sstate.moon_ra   = globals->get_ephem()->getMoonRightAscension();
 597             sstate.moon_dec  = globals->get_ephem()->getMoonDeclination();
 598             sstate.moon_dist = 40000.0 * moon_horiz_eff;
 599
 600             thesky->reposition( sstate, delta_time_sec );
 601         }
 602
 603         glEnable( GL_DEPTH_TEST );
 604         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 605             glEnable( GL_FOG );
 606             glFogi( GL_FOG_MODE, GL_EXP2 );
 607             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 608         }
 609
 610         // set sun/lighting parameters
 611         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 612
 613         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 614         // we only update GL_AMBIENT for our lights we will never get
 615         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 616         // explicitely to black.
 617         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 618         if (fgGetBool("/sim/rendering/specular-highlight")) {
 619             glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL,
 620                           GL_SEPARATE_SPECULAR_COLOR);
 621         } else {
 622             glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL,
 623                           GL_SINGLE_COLOR);
 624         }
 625
 626         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 627         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 628         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 629
 630         // texture parameters
 631         // glEnable( GL_TEXTURE_2D );
 632         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 633         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 634
 635         // glMatrixMode( GL_PROJECTION );
 636         // glLoadIdentity();
 637         ssgSetFOV( current__view->get_h_fov(),
 638                    current__view->get_v_fov() );
 639
 640         double agl =
 641             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 642             - globals->get_scenery()->get_cur_elev();
 643
 644         if ( agl > 10.0 ) {
 645             scene_nearplane = 10.0f;
 646             scene_farplane = 120000.0f;
 647         } else {
 648             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 649             scene_farplane = 120000.0f;
 650         }
 651
 652         ssgSetNearFar( scene_nearplane, scene_farplane );
 653
 654         // $$$ begin - added VS Renganthan 17 Oct 2K
 655         if(objc)
 656           fgUpdateDCS();
 657         // $$$ end - added VS Renganthan 17 Oct 2K
 658
 659 # ifdef FG_NETWORK_OLK
 660         if ( fgGetBool("/sim/networking/network-olk") ) {
 661             sgCoord fgdpos;
 662             other = head->next;             /* put listpointer to start  */
 663             while ( other != tail) {        /* display all except myself */
 664             if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 665                 other->fgd_sel->select(1);
 666                 sgSetCoord( &fgdpos, other->sgFGD_COORD );
 667                 other->fgd_pos->setTransform( &fgdpos );
 668             }
 669             other = other->next;
 670             }
 671
 672             // fgd_sel->select(1);
 673             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 674             // sgCoord fgdpos;
 675             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 676             // fgd_pos->setTransform( &fgdpos);
 677         }
 678 # endif
 679
 680 #ifdef FG_MPLAYER_AS
 681         // Update any multiplayer models
 682         globals->get_multiplayer_rx_mgr()->Update();
 683 #endif
 684
 685         if ( draw_otw && skyblend )
 686         {
 687             // draw the sky backdrop
 688
 689             // we need a white diffuse light for the phase of the moon
 690             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 691
 692             thesky->preDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 693
 694             // return to the desired diffuse color
 695             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 696
 697             // FIXME: This should not be needed, but at this time (08/15/2003)
 698             //        certain NVidia drivers don't seem to implement
 699             //        fgPushAttrib(FG_FOG_BIT) properly. The result is that
 700             //        there is not fog when looking at the sun.
 701             glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 702         }
 703
 704         // draw the ssg scene
 705         glEnable( GL_DEPTH_TEST );
 706
 707         ssgSetNearFar( scene_nearplane, scene_farplane );
 708
 709         if ( fgGetBool("/sim/rendering/wireframe") ) {
 710             // draw wire frame
 711             glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 712         }
 713         if ( draw_otw ) {
 714             ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 715         }
 716
 717         // This is a bit kludgy.  Every 200 frames, do an extra
 718         // traversal of the scene graph without drawing anything, but
 719         // with the field-of-view set to 360x360 degrees.  This
 720         // ensures that out-of-range random objects that are not in
 721         // the current view frustum will still be freed properly.
 722         static int counter = 0;
 723         counter++;
 724         if (counter == 200) {
 725           sgFrustum f;
 726           f.setFOV(360, 360);
 727                             // No need to put the near plane too close;
 728                             // this way, at least the aircraft can be
 729                             // culled.
 730           f.setNearFar(1000, 1000000);
 731           sgMat4 m;
 732           ssgGetModelviewMatrix(m);
 733           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 734           counter = 0;
 735         }
 736
 737         // change state for lighting here
 738
 739         // draw runway lighting
 740         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 741         ssgSetNearFar( scene_nearplane, scene_farplane );
 742
 743         if ( enhanced_lighting ) {
 744
 745             // Enable states for drawing points with GL_extension
 746             glEnable(GL_POINT_SMOOTH);
 747
 748             if ( distance_attenuation && glPointParameterIsSupported )
 749             {
 750                 // Enable states for drawing points with GL_extension
 751                 glEnable(GL_POINT_SMOOTH);
 752
 753                 float quadratic[3] = {1.0, 0.001, 0.0000001};
 754                 // makes the points fade as they move away
 755                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 756                 glPointParameterfPtr(GL_POINT_SIZE_MIN_EXT, 1.0);
 757             }
 758
 759             glPointSize(4.0);
 760
 761             // blending function for runway lights
 762             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 763         }
 764
 765         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 766         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 767         glEnable(GL_TEXTURE_GEN_S);
 768         glEnable(GL_TEXTURE_GEN_T);
 769         glPolygonMode(GL_FRONT, GL_POINT);
 770
 771         // draw runway lighting
 772         if ( draw_otw ) {
 773             ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 774         }
 775
 776         // change punch through and then draw taxi lighting
 777         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 778         // sgVec3 taxi_fog;
 779         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 780         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 781         if ( draw_otw ) {
 782             ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 783         }
 784
 785         // clean up lighting
 786         glPolygonMode(GL_FRONT, GL_FILL);
 787         glDisable(GL_TEXTURE_GEN_S);
 788         glDisable(GL_TEXTURE_GEN_T);
 789
 790         //static int _frame_count = 0;
 791         //if (_frame_count % 30 == 0) {
 792         //  printf("SSG: %s\n", ssgShowStats());
 793         //}
 794         //else {
 795         //  ssgShowStats();
 796         //}
 797         //_frame_count++;
 798
 799
 800         if ( enhanced_lighting ) {
 801             if ( distance_attenuation && glPointParameterIsSupported )
 802             {
 803                 glPointParameterfvPtr(GL_DISTANCE_ATTENUATION_EXT,
 804                                       default_attenuation);
 805             }
 806
 807             glPointSize(1.0);
 808             glDisable(GL_POINT_SMOOTH);
 809         }
 810
 811         // draw ground lighting
 812         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 813         if ( draw_otw ) {
 814             ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 815         }
 816
 817         if ( skyblend ) {
 818             // draw the sky cloud layers
 819             if ( draw_otw && fgGetBool("/environment/clouds/status") )
 820             {
 821                 thesky->postDraw( cur_fdm_state->get_Altitude()
 822                                   * SG_FEET_TO_METER );
 823             }
 824         }
 825
 826         if ( draw_otw && fgGetBool("/sim/rendering/clouds3d") )
 827         {
 828             glDisable( GL_FOG );
 829             glDisable( GL_LIGHTING );
 830             // cout << "drawing new clouds" << endl;
 831
 832             glEnable(GL_DEPTH_TEST);
 833             glEnable(GL_BLEND);
 834             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 835
 836             /*
 837             glEnable( GL_TEXTURE_2D );
 838             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 839             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 840             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 841             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 842             */
 843
 844 #ifdef FG_USE_CLOUDS_3D
 845             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 846 #endif
 847             glEnable( GL_FOG );
 848             glEnable( GL_LIGHTING );
 849             glEnable( GL_DEPTH_TEST );
 850             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 851         }
 852
 853         if ( draw_otw ) {
 854             globals->get_model_mgr()->draw();
 855             globals->get_aircraft_model()->draw();
 856         }
 857
 858         // display HUD && Panel
 859         glDisable( GL_FOG );
 860         glDisable( GL_DEPTH_TEST );
 861         // glDisable( GL_CULL_FACE );
 862         // glDisable( GL_TEXTURE_2D );
 863
 864         // update the controls subsystem
 865         globals->get_controls()->update(delta_time_sec);
 866
 867         hud_and_panel->apply();
 868         fgCockpitUpdate();
 869
 870         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 871         // This only works properly if called before the panel call
 872         if((fgGetBool("/sim/ATC/enabled")) || (fgGetBool("/sim/ai-traffic/enabled")))
 873             globals->get_ATC_display()->update(delta_time_sec);
 874
 875         // update the panel subsystem
 876         if ( globals->get_current_panel() != NULL ) {
 877             globals->get_current_panel()->update(delta_time_sec);
 878         }
 879         fgUpdate3DPanels();
 880
 881         // We can do translucent menus, so why not. :-)
 882         menus->apply();
 883         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 884         puDisplay();
 885         // glDisable ( GL_BLEND ) ;
 886
 887         glEnable( GL_DEPTH_TEST );
 888         glEnable( GL_FOG );
 889
 890         // Fade out the splash screen over the first three seconds.
 891         double t = globals->get_sim_time_sec();
 892         if ( t <= 1.0 ) {
 893             fgSplashUpdate(0.0, 1.0);
 894         } else if ( t <= 3.0) {
 895             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 896         }
 897     }
 898
 899     glutSwapBuffers();
 900 }
 901
 902
 903 // Update internal time dependent calculations (i.e. flight model)
 904 // FIXME: this distinction is obsolete; all subsystems now get delta
 905 // time on update.
 906 void fgUpdateTimeDepCalcs() {
 907     static bool inited = false;
 908
 909     static const SGPropertyNode *replay_master
 910         = fgGetNode( "/sim/freeze/replay", true );
 911     static SGPropertyNode *replay_time
 912         = fgGetNode( "/sim/replay/time", true );
 913     static const SGPropertyNode *replay_end_time
 914         = fgGetNode( "/sim/replay/end-time", true );
 915
 916     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 917
 918     fgLIGHT *l = &cur_light_params;
 919
 920     // Initialize the FDM here if it hasn't been and if we have a
 921     // scenery elevation hit.
 922
 923     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 924     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 925
 926     if ( !cur_fdm_state->get_inited() &&
 927          globals->get_scenery()->get_cur_elev() > -9990 )
 928     {
 929         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 930         cur_fdm_state->init();
 931         if ( cur_fdm_state->get_bound() ) {
 932             cur_fdm_state->unbind();
 933         }
 934         cur_fdm_state->bind();
 935     }
 936
 937     // conceptually, the following block could be done for each fdm
 938     // instance ...
 939     if ( cur_fdm_state->get_inited() ) {
 940         // we have been inited, and  we are good to go ...
 941
 942         if ( !inited ) {
 943             inited = true;
 944         }
 945
 946         if ( ! replay_master->getBoolValue() ) {
 947             globals->get_autopilot()->update( delta_time_sec );
 948             cur_fdm_state->update( delta_time_sec );
 949         } else {
 950             FGReplay *r = (FGReplay *)(globals->get_subsystem( "replay" ));
 951             r->replay( replay_time->getDoubleValue() );
 952             replay_time->setDoubleValue( replay_time->getDoubleValue()
 953                                          + ( delta_time_sec
 954                                              * fgGetInt("/sim/speed-up") ) );
 955         }
 956     } else {
 957         // do nothing, fdm isn't inited yet
 958     }
 959
 960     globals->get_model_mgr()->update(delta_time_sec);
 961     globals->get_aircraft_model()->update(delta_time_sec);
 962
 963     // update the view angle
 964     globals->get_viewmgr()->update(delta_time_sec);
 965
 966     l->UpdateAdjFog();
 967
 968     // Update solar system
 969     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 970                               globals->get_time_params()->getLst(),
 971                               cur_fdm_state->get_Latitude() );
 972
 973     // Update radio stack model
 974     current_radiostack->update(delta_time_sec);
 975 }
 976
 977
 978 void fgInitTimeDepCalcs( void ) {
 979     // noop for now
 980 }
 981
 982
 983 static const double alt_adjust_ft = 3.758099;
 984 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 985
 986
 987 // What should we do when we have nothing else to do?  Let's get ready
 988 // for the next move and update the display?
 989 static void fgMainLoop( void ) {
 990     int model_hz = fgGetInt("/sim/model-hz");
 991
 992     static const SGPropertyNode *longitude
 993         = fgGetNode("/position/longitude-deg");
 994     static const SGPropertyNode *latitude
 995         = fgGetNode("/position/latitude-deg");
 996     static const SGPropertyNode *altitude
 997         = fgGetNode("/position/altitude-ft");
 998     static const SGPropertyNode *clock_freeze
 999         = fgGetNode("/sim/freeze/clock", true);
1000     static const SGPropertyNode *cur_time_override
1001         = fgGetNode("/sim/time/cur-time-override", true);
1002     static const SGPropertyNode *replay_master
1003         = fgGetNode("/sim/freeze/replay", true);
1004
1005     // Update the elapsed time.
1006     static bool first_time = true;
1007     if ( first_time ) {
1008         last_time_stamp.stamp();
1009         first_time = false;
1010     }
1011
1012     double throttle_hz = fgGetDouble("/sim/frame-rate-throttle-hz", 0.0);
1013     if ( throttle_hz > 0.0 ) {
1014         // simple frame rate throttle
1015         double dt = 1000000.0 / throttle_hz;
1016         current_time_stamp.stamp();
1017         while ( current_time_stamp - last_time_stamp < dt ) {
1018             current_time_stamp.stamp();
1019         }
1020     } else {
1021         // run as fast as the app will go
1022         current_time_stamp.stamp();
1023     }
1024
1025     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
1026     if ( clock_freeze->getBoolValue() ) {
1027         delta_time_sec = 0;
1028     }
1029     last_time_stamp = current_time_stamp;
1030     globals->inc_sim_time_sec( delta_time_sec );
1031     SGAnimation::set_sim_time_sec( globals->get_sim_time_sec() );
1032
1033     static long remainder = 0;
1034     long elapsed;
1035 #ifdef FANCY_FRAME_COUNTER
1036     int i;
1037     double accum;
1038 #else
1039     static time_t last_time = 0;
1040     static int frames = 0;
1041 #endif // FANCY_FRAME_COUNTER
1042
1043     SGTime *t = globals->get_time_params();
1044
1045     sglog().setLogLevels( SG_ALL, (sgDebugPriority)fgGetInt("/sim/log-level") );
1046     sglog().setLogLevels( SG_ALL, SG_INFO );
1047
1048     SGLocation * acmodel_location = 0;
1049     if(cur_fdm_state->getACModel() != 0) {
1050       acmodel_location = (SGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getSGLocation();
1051     }
1052
1053     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
1054     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
1055
1056 #ifdef FG_NETWORK_OLK
1057     if ( fgGetBool("/sim/networking/network-olk") ) {
1058         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
1059             // printf("FGD: Netupdate\n");
1060             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
1061             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
1062         }
1063     }
1064 #endif
1065
1066 #if defined( ENABLE_PLIB_JOYSTICK )
1067     // Read joystick and update control settings
1068     // if ( fgGetString("/sim/control-mode") == "joystick" )
1069     // {
1070     //    fgJoystickRead();
1071     // }
1072 #elif defined( ENABLE_GLUT_JOYSTICK )
1073     // Glut joystick support works by feeding a joystick handler
1074     // function to glut.  This is taken care of once in the joystick
1075     // init routine and we don't have to worry about it again.
1076 #endif
1077
1078     // Fix elevation.  I'm just sticking this here for now, it should
1079     // probably move eventually
1080
1081     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
1082            scenery.get_cur_elev(),
1083            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1084            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1085
1086 #if 0
1087 // This code is used by LaRCsim/UIUC to position the aircraft at a proper
1088 // place. This code should eventually go into the LaRCsim directory.
1089 // Commented out at Jul 27 2003 because tests show it is not needed.
1090 // Can probbaly be safely removed after Spet. 2003 - EMH
1091
1092     if ( acmodel_location != 0 ) {
1093       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
1094         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
1095              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 130.0) ) {
1096             // now set aircraft altitude above ground
1097             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
1098                cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
1099                acmodel_location->get_cur_elev_m() + alt_adjust_m - 130.0,
1100                acmodel_location->get_cur_elev_m() + alt_adjust_m );
1101             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
1102                                                 + alt_adjust_m) * SG_METER_TO_FEET );
1103             SG_LOG( SG_ALL, SG_DEBUG,
1104                 "<*> resetting altitude to "
1105                 << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
1106                 << " meters" );
1107         }
1108       }
1109     }
1110 // End of code in question. (see Curt is this code used? above)
1111 #endif
1112
1113     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
1114            scenery.get_cur_elev(),
1115            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1116            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1117
1118     // cout << "Warp = " << globals->get_warp() << endl;
1119
1120     // update "time"
1121     static bool last_clock_freeze = false;
1122
1123     if ( clock_freeze->getBoolValue() ) {
1124         // clock freeze requested
1125         if ( cur_time_override->getLongValue() == 0 ) {
1126             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
1127             globals->set_warp( 0 );
1128         }
1129     } else {
1130         // no clock freeze requested
1131         if ( last_clock_freeze == true ) {
1132             // clock just unfroze, let's set warp as the difference
1133             // between frozen time and current time so we don't get a
1134             // time jump (and corresponding sky object and lighting
1135             // jump.)
1136             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
1137             fgSetLong( "/sim/time/cur-time-override", 0 );
1138         }
1139         if ( globals->get_warp_delta() != 0 ) {
1140             globals->inc_warp( globals->get_warp_delta() );
1141         }
1142     }
1143
1144     last_clock_freeze = clock_freeze->getBoolValue();
1145
1146     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1147                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1148                cur_time_override->getLongValue(),
1149                globals->get_warp() );
1150
1151     if ( globals->get_warp_delta() != 0 ) {
1152         fgUpdateSkyAndLightingParams();
1153     }
1154
1155     // update magvar model
1156     globals->get_mag()->update( longitude->getDoubleValue()
1157                               * SGD_DEGREES_TO_RADIANS,
1158                             latitude->getDoubleValue()
1159                               * SGD_DEGREES_TO_RADIANS,
1160                             altitude->getDoubleValue() * SG_FEET_TO_METER,
1161                             globals->get_time_params()->getJD() );
1162
1163     // Get elapsed time (in usec) for this past frame
1164     elapsed = fgGetTimeInterval();
1165     SG_LOG( SG_ALL, SG_DEBUG,
1166             "Elapsed time interval is = " << elapsed
1167             << ", previous remainder is = " << remainder );
1168
1169     // Calculate frame rate average
1170 #ifdef FANCY_FRAME_COUNTER
1171     /* old fps calculation */
1172     if ( elapsed > 0 ) {
1173         double tmp;
1174         accum = 0.0;
1175         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1176             tmp = general.get_frame(i);
1177             accum += tmp;
1178             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1179             general.set_frame(i+1,tmp);
1180         }
1181         tmp = 1000000.0 / (float)elapsed;
1182         general.set_frame(0,tmp);
1183         // printf("frame[0] = %.2f\n", general.frames[0]);
1184         accum += tmp;
1185         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1186         // printf("ave = %.2f\n", general.frame_rate);
1187     }
1188 #else
1189     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1190         general.set_frame_rate( frames );
1191         fgSetInt("/sim/frame-rate", frames);
1192         SG_LOG( SG_ALL, SG_DEBUG,
1193             "--> Frame rate is = " << general.get_frame_rate() );
1194         frames = 0;
1195     }
1196     last_time = t->get_cur_time();
1197     ++frames;
1198 #endif
1199
1200     // Run ATC subsystem
1201     if (fgGetBool("/sim/ATC/enabled"))
1202         globals->get_ATC_mgr()->update(delta_time_sec);
1203
1204     // Run the AI subsystem
1205     if (fgGetBool("/sim/ai-traffic/enabled"))
1206         globals->get_AI_mgr()->update(delta_time_sec);
1207
1208     // Run flight model
1209
1210     // Calculate model iterations needed for next frame
1211     elapsed += remainder;
1212
1213     global_multi_loop = (long)(((double)elapsed * 0.000001) * model_hz );
1214     remainder = elapsed - ( (global_multi_loop*1000000) / model_hz );
1215     SG_LOG( SG_ALL, SG_DEBUG,
1216             "Model iterations needed = " << global_multi_loop
1217             << ", new remainder = " << remainder );
1218
1219     // chop max interations to something reasonable if the sim was
1220     // delayed for an excesive amount of time
1221     if ( global_multi_loop > 2.0 * model_hz ) {
1222         global_multi_loop = (int)(2.0 * model_hz );
1223         remainder = 0;
1224     }
1225
1226     // flight model
1227     if ( global_multi_loop > 0 ) {
1228         fgUpdateTimeDepCalcs();
1229     } else {
1230         SG_LOG( SG_ALL, SG_DEBUG,
1231             "Elapsed time is zero ... we're zinging" );
1232     }
1233
1234     // Do any I/O channel work that might need to be done
1235     globals->get_io()->update( delta_time_sec );
1236
1237     // see if we need to load any deferred-load textures
1238     globals->get_matlib()->load_next_deferred();
1239
1240     // Run audio scheduler
1241 #ifdef ENABLE_AUDIO_SUPPORT
1242     if ( fgGetBool("/sim/sound/audible")
1243            && globals->get_soundmgr()->is_working() ) {
1244         globals->get_soundmgr()->update( delta_time_sec );
1245     }
1246 #endif
1247
1248     globals->get_subsystem_mgr()->update(delta_time_sec);
1249
1250     //
1251     // Tile Manager updates - see if we need to load any new scenery tiles.
1252     //   this code ties together the fdm, viewer and scenery classes...
1253     //   we may want to move this to it's own class at some point
1254     //
1255     double visibility_meters = fgGetDouble("/environment/visibility-m");
1256     FGViewer *current_view = globals->get_current_view();
1257
1258     // update tile manager for FDM...
1259     // ...only if location is different than the viewer (to avoid duplicating effort)
1260     if( acmodel_location != current_view->getSGLocation() ) {
1261       if( acmodel_location != 0 ) {
1262         globals->get_tile_mgr()->prep_ssg_nodes( acmodel_location,
1263                                                  visibility_meters );
1264         globals->get_tile_mgr()->
1265             update( acmodel_location, visibility_meters,
1266                     acmodel_location->get_absolute_view_pos(globals->get_scenery()->get_center()) );
1267         // save results of update in SGLocation for fdm...
1268         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1269           acmodel_location->
1270               set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1271         }
1272         acmodel_location->
1273             set_tile_center( globals->get_scenery()->get_next_center() );
1274       }
1275     }
1276
1277     globals->get_tile_mgr()->prep_ssg_nodes( current_view->getSGLocation(),
1278                                              visibility_meters );
1279     // update tile manager for view...
1280     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1281     // after the FDM's until all of Flight Gear code references the viewer's location
1282     // for elevation instead of the "scenery's" current elevation.
1283     SGLocation *view_location = globals->get_current_view()->getSGLocation();
1284     globals->get_tile_mgr()->update( view_location, visibility_meters,
1285                                      current_view->get_absolute_view_pos() );
1286     // save results of update in SGLocation for fdm...
1287     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1288       current_view->getSGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1289     }
1290     current_view->getSGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1291
1292     // If fdm location is same as viewer's then we didn't do the update for fdm location
1293     //   above so we need to save the viewer results in the fdm SGLocation as well...
1294     if( acmodel_location == current_view->getSGLocation() ) {
1295       if( acmodel_location != 0 ) {
1296         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1297           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1298         }
1299         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1300       }
1301     }
1302
1303     // END Tile Manager udpates
1304
1305     // redraw display
1306     fgRenderFrame();
1307
1308     SG_LOG( SG_ALL, SG_DEBUG, "" );
1309 }
1310
1311
1312 // This is the top level master main function that is registered as
1313 // our idle funciton
1314
1315 // The first few passes take care of initialization things (a couple
1316 // per pass) and once everything has been initialized fgMainLoop from
1317 // then on.
1318
1319 static void fgIdleFunction ( void ) {
1320     // printf("idle state == %d\n", idle_state);
1321
1322     if ( idle_state == 0 ) {
1323         // Initialize the splash screen right away
1324         if ( fgGetBool("/sim/startup/splash-screen") ) {
1325             fgSplashInit();
1326         }
1327
1328         idle_state++;
1329     } else if ( idle_state == 1 ) {
1330         // Initialize audio support
1331 #ifdef ENABLE_AUDIO_SUPPORT
1332
1333         // Start the intro music
1334         if ( fgGetBool("/sim/startup/intro-music") ) {
1335             SGPath mp3file( globals->get_fg_root() );
1336             mp3file.append( "Sounds/intro.mp3" );
1337
1338             SG_LOG( SG_GENERAL, SG_INFO,
1339                 "Starting intro music: " << mp3file.str() );
1340
1341 #if defined( __CYGWIN__ )
1342             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1343 #elif defined( WIN32 )
1344             string command = "start /m " + mp3file.str();
1345 #else
1346             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1347 #endif
1348
1349             system ( command.c_str() );
1350         }
1351 #endif
1352
1353         idle_state++;
1354     } else if ( idle_state == 2 ) {
1355         // These are a few miscellaneous things that aren't really
1356         // "subsystems" but still need to be initialized.
1357
1358 #ifdef USE_GLIDE
1359         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1360             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1361         }
1362 #endif
1363
1364         idle_state++;
1365     } else if ( idle_state == 3 ) {
1366         // This is the top level init routine which calls all the
1367         // other subsystem initialization routines.  If you are adding
1368         // a subsystem to flightgear, its initialization call should
1369         // located in this routine.
1370         if( !fgInitSubsystems()) {
1371             SG_LOG( SG_GENERAL, SG_ALERT,
1372                 "Subsystem initializations failed ..." );
1373             exit(-1);
1374         }
1375
1376         idle_state++;
1377     } else if ( idle_state == 4 ) {
1378         // setup OpenGL view parameters
1379         fgInitVisuals();
1380
1381         // Read the list of available aircrafts
1382         fgReadAircraft();
1383
1384         idle_state++;
1385     } else if ( idle_state == 5 ) {
1386
1387         idle_state++;
1388     } else if ( idle_state == 6 ) {
1389         // sleep(1);
1390         idle_state = 1000;
1391
1392         SG_LOG( SG_GENERAL, SG_INFO, "Panel visible = " << fgPanelVisible() );
1393         fgReshape( fgGetInt("/sim/startup/xsize"),
1394                fgGetInt("/sim/startup/ysize") );
1395     }
1396
1397     if ( idle_state == 1000 ) {
1398         // We've finished all our initialization steps, from now on we
1399         // run the main loop.
1400
1401         glutIdleFunc(fgMainLoop);
1402     } else {
1403         if ( fgGetBool("/sim/startup/splash-screen") ) {
1404             fgSplashUpdate(0.0, 1.0);
1405         }
1406     }
1407 }
1408
1409 // options.cxx needs to see this for toggle_panel()
1410 // Handle new window size or exposure
1411 void fgReshape( int width, int height ) {
1412     int view_h;
1413
1414     if ( (!fgGetBool("/sim/virtual-cockpit"))
1415          && fgPanelVisible() && idle_state == 1000 ) {
1416         view_h = (int)(height * (globals->get_current_panel()->getViewHeight() -
1417                              globals->get_current_panel()->getYOffset()) / 768.0);
1418     } else {
1419         view_h = height;
1420     }
1421
1422     // for all views
1423     FGViewMgr *viewmgr = globals->get_viewmgr();
1424     for ( int i = 0; i < viewmgr->size(); ++i ) {
1425       viewmgr->get_view(i)->
1426         set_aspect_ratio((float)view_h / (float)width);
1427     }
1428
1429     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1430
1431     fgSetInt("/sim/startup/xsize", width);
1432     fgSetInt("/sim/startup/ysize", height);
1433     guiInitMouse(width, height);
1434
1435     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1436                viewmgr->get_current_view()->get_v_fov() );
1437
1438     fgHUDReshape();
1439
1440 #ifdef FG_USE_CLOUDS_3D
1441     sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
1442                         viewmgr->get_current_view()->get_v_fov() );
1443 #endif
1444
1445 }
1446
1447 // Initialize GLUT and define a main window
1448 static bool fgGlutInit( int *argc, char **argv ) {
1449
1450 #if !defined( macintosh )
1451     // GLUT will extract all glut specific options so later on we only
1452     // need wory about our own.
1453     glutInit(argc, argv);
1454 #endif
1455
1456     // Define Display Parameters. Clouds3d works best with --bpp32 option
1457     if ( fgGetBool("/sim/rendering/clouds3d") ) {
1458         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_ALPHA );
1459     } else {
1460         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1461     }
1462
1463     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1464             fgGetInt("/sim/startup/xsize") << "x"
1465             << fgGetInt("/sim/startup/ysize") );
1466
1467     // Define initial window size
1468     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1469                     fgGetInt("/sim/startup/ysize") );
1470
1471     // Initialize windows
1472     if ( !fgGetBool("/sim/startup/game-mode")) {
1473         // Open the regular window
1474         glutCreateWindow("FlightGear");
1475 #ifndef GLUT_WRONG_VERSION
1476     } else {
1477         // Open the cool new 'game mode' window
1478         char game_mode_str[256];
1479 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1480 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1481 #ifndef ENUM_CURRENT_SETTINGS
1482 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1483 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1484 #endif
1485
1486         DEVMODE dm;
1487         dm.dmSize = sizeof(DEVMODE);
1488         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1489         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1490         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1491         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1492                             fgGetInt("/sim/startup/ysize") );
1493         sprintf( game_mode_str, "%dx%d:%d@%d",
1494                      dm.dmPelsWidth,
1495                      dm.dmPelsHeight,
1496                      dm.dmBitsPerPel,
1497                      dm.dmDisplayFrequency );
1498 #else
1499         // Open the cool new 'game mode' window
1500         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1501              fgGetInt("/sim/startup/xsize"),
1502              fgGetInt("/sim/startup/ysize"),
1503              fgGetInt("/sim/rendering/bits-per-pixel"));
1504
1505 #endif // HAVE_WINDOWS_H
1506         SG_LOG( SG_GENERAL, SG_INFO,
1507             "game mode params = " << game_mode_str );
1508         glutGameModeString( game_mode_str );
1509         glutEnterGameMode();
1510 #endif // GLUT_WRONG_VERSION
1511     }
1512
1513     // This seems to be the absolute earliest in the init sequence
1514     // that these calls will return valid info.  Too bad it's after
1515     // we've already created and sized out window. :-(
1516     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1517     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1518     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1519     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1520
1521     GLint tmp;
1522     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1523     general.set_glMaxTexSize( tmp );
1524     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1525
1526     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1527     general.set_glDepthBits( tmp );
1528     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1529
1530     return true;
1531 }
1532
1533
1534 // Initialize GLUT event handlers
1535 static bool fgGlutInitEvents( void ) {
1536     // call fgReshape() on window resizes
1537     glutReshapeFunc( fgReshape );
1538
1539     // keyboard and mouse callbacks are set in FGInput::init
1540
1541     // call fgMainLoop() whenever there is
1542     // nothing else to do
1543     glutIdleFunc( fgIdleFunction );
1544
1545     // draw the scene
1546     glutDisplayFunc( fgRenderFrame );
1547
1548     return true;
1549 }
1550
1551 // Main top level initialization
1552 bool fgMainInit( int argc, char **argv ) {
1553
1554 #if defined( macintosh )
1555     freopen ("stdout.txt", "w", stdout );
1556     freopen ("stderr.txt", "w", stderr );
1557     argc = ccommand( &argv );
1558 #endif
1559
1560     // set default log levels
1561     sglog().setLogLevels( SG_ALL, SG_INFO );
1562
1563     string version;
1564 #ifdef FLIGHTGEAR_VERSION
1565     version = FLIGHTGEAR_VERSION;
1566 #else
1567     version = "unknown version";
1568 #endif
1569     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1570             << version );
1571     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1572
1573     // Allocate global data structures.  This needs to happen before
1574     // we parse command line options
1575
1576     globals = new FGGlobals;
1577
1578     // seed the random number generater
1579     sg_srandom_time();
1580
1581     SGRoute *route = new SGRoute;
1582     globals->set_route( route );
1583
1584     FGControls *controls = new FGControls;
1585     globals->set_controls( controls );
1586
1587     string_list *col = new string_list;
1588     globals->set_channel_options_list( col );
1589
1590     // Scan the config file(s) and command line options to see if
1591     // fg_root was specified (ignore all other options for now)
1592     fgInitFGRoot(argc, argv);
1593
1594     // Check for the correct base package version
1595     static char required_version[] = "0.9.2";
1596     string base_version = fgBasePackageVersion();
1597     if ( !(base_version == required_version) ) {
1598         // tell the operator how to use this application
1599
1600         cerr << endl << "Base package check failed ... " \
1601              << "Found version " << base_version << " at: " \
1602              << globals->get_fg_root() << endl;
1603         cerr << "Please upgrade to version: " << required_version << endl;
1604         exit(-1);
1605     }
1606
1607     // Initialize the Aircraft directory to "" (UIUC)
1608     aircraft_dir = "";
1609
1610     // Load the configuration parameters.  (Command line options
1611     // overrides config file options.  Config file options override
1612     // defaults.)
1613     if ( !fgInitConfig(argc, argv) ) {
1614         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1615         exit(-1);
1616     }
1617
1618     // Initialize the Window/Graphics environment.
1619     if( !fgGlutInit(&argc, argv) ) {
1620         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1621         exit(-1);
1622     }
1623
1624     // Initialize the various GLUT Event Handlers.
1625     if( !fgGlutInitEvents() ) {
1626         SG_LOG( SG_GENERAL, SG_ALERT,
1627                 "GLUT event handler initialization failed ..." );
1628         exit(-1);
1629     }
1630
1631     // Initialize plib net interface
1632     netInit( &argc, argv );
1633
1634     // Initialize ssg (from plib).  Needs to come before we do any
1635     // other ssg stuff, but after opengl/glut has been initialized.
1636     ssgInit();
1637
1638     // Initialize the user interface (we need to do this before
1639     // passing off control to glut and before fgInitGeneral to get our
1640     // fonts !!!
1641     guiInit();
1642
1643     // Read the list of available aircrafts
1644     fgReadAircraft();
1645
1646 #ifdef GL_EXT_texture_lod_bias
1647     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1648 #endif
1649
1650             // get the address of our OpenGL extensions
1651     if ( fgGetBool("/sim/rendering/distance-attenuation") )
1652     {
1653         if (SGIsOpenGLExtensionSupported("GL_EXT_point_parameters") ) {
1654             glPointParameterIsSupported = true;
1655             glPointParameterfPtr = (glPointParameterfProc)
1656                                    SGLookupFunction("glPointParameterfEXT");
1657             glPointParameterfvPtr = (glPointParameterfvProc)
1658                                     SGLookupFunction("glPointParameterfvEXT");
1659
1660         } else if ( SGIsOpenGLExtensionSupported("GL_ARB_point_parameters") ) {
1661             glPointParameterIsSupported = true;
1662             glPointParameterfPtr = (glPointParameterfProc)
1663                                    SGLookupFunction("glPointParameterfARB");
1664             glPointParameterfvPtr = (glPointParameterfvProc)
1665                                     SGLookupFunction("glPointParameterfvARB");
1666         } else
1667             glPointParameterIsSupported = false;
1668    }
1669
1670     // based on the requested presets, calculate the true starting
1671     // lon, lat
1672     fgInitNav();
1673     fgInitPosition();
1674
1675     SGTime *t = fgInitTime();
1676     globals->set_time_params( t );
1677
1678     // Do some quick general initializations
1679     if( !fgInitGeneral()) {
1680         SG_LOG( SG_GENERAL, SG_ALERT,
1681             "General initializations failed ..." );
1682         exit(-1);
1683     }
1684
1685     SGPath modelpath( globals->get_fg_root() );
1686     ssgModelPath( (char *)modelpath.c_str() );
1687
1688     ////////////////////////////////////////////////////////////////////
1689     // Initialize the property-based built-in commands
1690     ////////////////////////////////////////////////////////////////////
1691     fgInitCommands();
1692
1693     ////////////////////////////////////////////////////////////////////
1694     // Initialize the material manager
1695     ////////////////////////////////////////////////////////////////////
1696     globals->set_matlib( new SGMaterialLib );
1697
1698     globals->set_model_lib(new SGModelLib);
1699
1700     ////////////////////////////////////////////////////////////////////
1701     // Initialize the TG scenery subsystem.
1702     ////////////////////////////////////////////////////////////////////
1703     globals->set_scenery( new FGScenery );
1704     globals->get_scenery()->init();
1705     globals->get_scenery()->bind();
1706     globals->set_tile_mgr( new FGTileMgr );
1707
1708     ////////////////////////////////////////////////////////////////////
1709     // Initialize the general model subsystem.
1710     ////////////////////////////////////////////////////////////////////
1711     globals->set_model_mgr(new FGModelMgr);
1712     globals->get_model_mgr()->init();
1713     globals->get_model_mgr()->bind();
1714
1715     ////////////////////////////////////////////////////////////////////
1716     // Initialize the 3D aircraft model subsystem (has a dependency on
1717     // the scenery subsystem.)
1718     ////////////////////////////////////////////////////////////////////
1719     globals->set_aircraft_model(new FGAircraftModel);
1720     globals->get_aircraft_model()->init();
1721     globals->get_aircraft_model()->bind();
1722
1723     ////////////////////////////////////////////////////////////////////
1724     // Initialize the view manager subsystem.
1725     ////////////////////////////////////////////////////////////////////
1726     FGViewMgr *viewmgr = new FGViewMgr;
1727     globals->set_viewmgr( viewmgr );
1728     viewmgr->init();
1729     viewmgr->bind();
1730
1731
1732     // Initialize the sky
1733     SGPath ephem_data_path( globals->get_fg_root() );
1734     ephem_data_path.append( "Astro" );
1735     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1736     ephem->update( globals->get_time_params()->getMjd(),
1737                globals->get_time_params()->getLst(),
1738                0.0 );
1739     globals->set_ephem( ephem );
1740
1741                             // TODO: move to environment mgr
1742     thesky = new SGSky;
1743     SGPath texture_path(globals->get_fg_root());
1744     texture_path.append("Textures");
1745     texture_path.append("Sky");
1746     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1747         SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1748         thesky->add_cloud_layer(layer);
1749     }
1750
1751
1752     SGPath sky_tex_path( globals->get_fg_root() );
1753     sky_tex_path.append( "Textures" );
1754     sky_tex_path.append( "Sky" );
1755     thesky->texture_path( sky_tex_path.str() );
1756
1757     // The sun and moon diameters are scaled down numbers of the
1758     // actual diameters. This was needed to fit bot the sun and the
1759     // moon within the distance to the far clip plane.
1760     // Moon diameter:    3,476 kilometers
1761     // Sun diameter: 1,390,000 kilometers
1762     thesky->build( 80000.0, 80000.0,
1763                    463.3, 361.8,
1764                    globals->get_ephem()->getNumPlanets(),
1765                    globals->get_ephem()->getPlanets(),
1766                    globals->get_ephem()->getNumStars(),
1767                    globals->get_ephem()->getStars() );
1768
1769     // Initialize MagVar model
1770     SGMagVar *magvar = new SGMagVar();
1771     globals->set_mag( magvar );
1772
1773
1774                                 // kludge to initialize mag compass
1775                                 // (should only be done for in-flight
1776                                 // startup)
1777     // update magvar model
1778     globals->get_mag()->update( fgGetDouble("/position/longitude-deg")
1779                                 * SGD_DEGREES_TO_RADIANS,
1780                                 fgGetDouble("/position/latitude-deg")
1781                                 * SGD_DEGREES_TO_RADIANS,
1782                                 fgGetDouble("/position/altitude-ft")
1783                                 * SG_FEET_TO_METER,
1784                                 globals->get_time_params()->getJD() );
1785     double var = globals->get_mag()->get_magvar() * SGD_RADIANS_TO_DEGREES;
1786     fgSetDouble("/instrumentation/heading-indicator/offset-deg", -var);
1787
1788     // airport = new ssgBranch;
1789     // airport->setName( "Airport Lighting" );
1790     // lighting->addKid( airport );
1791
1792     // ADA
1793     fgLoadDCS();
1794     // ADA
1795
1796 #ifdef FG_NETWORK_OLK
1797     // Do the network intialization
1798     if ( fgGetBool("/sim/networking/network-olk") ) {
1799         printf("Multipilot mode %s\n",
1800                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1801     }
1802 #endif
1803
1804     // build our custom render states
1805     fgBuildRenderStates();
1806
1807     // pass control off to the master GLUT event handler
1808     glutMainLoop();
1809
1810     // we never actually get here ... but to avoid compiler warnings,
1811     // etc.
1812     return false;
1813 }
1814
1815
1816 // $$$ end - added VS Renganathan, 15 Oct 2K
1817 //         - added Venky         , 12 Nov 2K
1818
1819
1820 void fgLoadDCS(void) {
1821
1822     ssgEntity *ship_obj = NULL;
1823
1824     char obj_filename[25];
1825
1826     for ( int k = 0; k < 32; k++ ) {
1827         ship_pos[k]=NULL;
1828     }
1829
1830     SGPath tile_path( globals->get_fg_root());
1831     tile_path.append( "Scenery" );
1832     tile_path.append( "Objects.txt" );
1833     sg_gzifstream in( tile_path.str() );
1834     if ( ! in.is_open() ) {
1835         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1836     } else {
1837
1838         SGPath modelpath( globals->get_fg_root() );
1839         modelpath.append( "Models" );
1840         modelpath.append( "Geometry" );
1841
1842         SGPath texturepath( globals->get_fg_root() );
1843         texturepath.append( "Models" );
1844         texturepath.append( "Textures" );
1845
1846         ssgModelPath( (char *)modelpath.c_str() );
1847         ssgTexturePath( (char *)texturepath.c_str() );
1848
1849         ship_sel = new ssgSelector;
1850
1851         char c;
1852         while ( ! in.eof() ) {
1853             in >> ::skipws;
1854             if ( in.get( c ) && c == '#' ) {
1855                 in >> skipeol;
1856             } else {
1857                 in.putback(c);
1858                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1859                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1860                    int chj=getchar();*/
1861
1862                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1863                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1864
1865                 ship_pos[objc] = new ssgTransform;
1866
1867                 // type "repeat" in objects.txt to load one more
1868                 // instance of the last object.
1869
1870                 if ( strcmp(obj_filename,"repeat") != 0) {
1871                     ship_obj =
1872                       globals->get_model_lib()->load_model( globals->get_fg_root(), obj_filename, globals->get_props(), globals->get_sim_time_sec() );
1873                 }
1874
1875                 if ( ship_obj != NULL ) {
1876                                 ship_obj->setName(obj_filename);
1877                             if (objc == 0)
1878                                         ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1879                                 else
1880                                         ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1881                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1882                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1883                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1884                             << obj_filename );
1885                 } else {
1886                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1887                             << obj_filename );
1888                 }
1889
1890                             // temporary hack for deck lights - ultimately should move to PLib (when??)
1891                             //const char *extn = file_extension ( obj_filename ) ;
1892                             if ( objc == 1 ){
1893                                 // ssgVertexArray *lights = new ssgVertexArray( 100 );
1894                                 ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1895                                 ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1896                                 ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1897                                 int ltype[500], light_type = 0;
1898                                 static int ltcount = 0;
1899                                 string token;
1900                                 sgVec3 rway_dir,rway_normal,lightpt;
1901                                 Point3D node;
1902                                 modelpath.append(obj_filename);
1903                                 sg_gzifstream in1( modelpath.str() );
1904                                 if ( ! in1.is_open() ) {
1905                                         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1906                                 } else {
1907                                         while ( ! in1.eof() ) {
1908                                                         in1 >> ::skipws;
1909                                                 if ( in1.get( c ) && c == '#' ) {
1910                                                         in1 >> skipeol;
1911                                                 } else {
1912                                                         in1.putback(c);
1913                                                         in1 >> token;
1914                                                         //cout << token << endl;
1915                                                         if ( token == "runway" ) {
1916                                                                 in1 >> node;
1917                                                                 sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1918                                                         } else if ( token == "edgelight" ) {
1919                                                                 in1 >> node;
1920                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1921                                                                 light_type = 1;
1922                                                         } else if ( token == "taxi" ) {
1923                                                                 in1 >> node;
1924                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1925                                                                 light_type = 2;
1926                                                         } else if ( token == "vasi" ) {
1927                                                                 in1 >> node;
1928                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1929                                                                 light_type = 3;
1930                                                         } else if ( token == "threshold" ) {
1931                                                                 in1 >> node;
1932                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1933                                                                 light_type = 4;
1934                                                         } else if ( token == "rabbit" ) {
1935                                                                 in1 >> node;
1936                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1937                                                                 light_type = 5;
1938                                                         } else if ( token == "ols" ) {
1939                                                                 in1 >> node;
1940                                                                 sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1941                                                                 light_type = 6;
1942                                                         } else if ( token == "red" ) {
1943                                                                 in1 >> node;
1944                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1945                                                                 light_type = 7;
1946                                                         } else if ( token == "green" ) {
1947                                                                 in1 >> node;
1948                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1949                                                                 light_type = 8;
1950                                                         } else if ( token == "lp" ) {
1951                                                                 in1 >> node;
1952                                                                 sgSetVec3 (lightpt, node[0], node[1], node[2] );
1953                                                                 lightpoints->add( lightpt );
1954                                                                 lightnormals->add( rway_normal );
1955                                                                 lightdir->add( rway_dir );
1956                                                                 ltype[ltcount]= light_type;
1957                                                                 ltcount++;
1958                                                         }
1959                                                         if (in1.eof()) break;
1960                                                 }
1961                                         }  //while
1962
1963 #if 0
1964                                         if ( lightpoints->getNum() ) {
1965                                                 ssgBranch *lightpoints_branch;
1966                                                 long int dummy = -999;
1967                                                 dummy_tile = new FGTileEntry((SGBucket)dummy);
1968                                                 dummy_tile->lightmaps_sequence = new ssgSelector;
1969                                                 dummy_tile->ols_transform = new ssgTransform;
1970
1971                                                 // call function to generate the runway lights
1972                                                 lightpoints_branch =
1973                                                 dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1974                                                                                                                         lightdir, ltype);
1975                                                 lightpoints_brightness->addKid(lightpoints_branch);
1976                                                 lightpoints_transform->addKid(lightpoints_brightness);
1977                                             //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1978                                                 lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1979                                                 lightpoints_transform->ref();
1980                                                 globals->get_scenery()->get_gnd_lights_root()->addKid( lightpoints_transform );
1981                                         }
1982 #endif
1983                                 } //if in1
1984                 } //if objc
1985                             // end hack for deck lights
1986
1987                 objc++;
1988
1989                 if (in.eof()) break;
1990             }
1991         } // while
1992
1993         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
1994
1995         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
1996     }
1997
1998     return;
1999  }
2000
2001
2002 void fgUpdateDCS (void) {
2003
2004     // double eye_lat,eye_lon,eye_alt;
2005     // static double obj_head;
2006     double sl_radius,obj_latgc;
2007     // float nresultmat[4][4];
2008     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
2009     double bz[3];
2010
2011     // Instantaneous Geodetic Lat/Lon/Alt of moving object
2012     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
2013
2014     // Deck should be the first object in objects.txt in case of fdm=ada
2015
2016     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
2017             if ((fdm->get_iaux(1))==1)
2018             {
2019                     obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
2020                     obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
2021                     obj_alt[1] = fdm->get_daux(3);
2022                     obj_pitch[1] = fdm->get_faux(1);
2023                     obj_roll[1] = fdm->get_faux(2);
2024             }
2025     }
2026
2027     for ( int m = 0; m < objc; m++ ) {
2028         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
2029         //int v=getchar();
2030
2031         //Geodetic to Geocentric angles for rotation
2032         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
2033
2034         //moving object gbs-posn in cartesian coords
2035         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
2036         Point3D obj_pos = sgGeodToCart( obj_posn );
2037
2038         // Translate moving object w.r.t eye
2039         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
2040         bz[0]=Objtrans.x();
2041         bz[1]=Objtrans.y();
2042         bz[2]=Objtrans.z();
2043
2044        // rotate dynamic objects for lat,lon & alt and other motion about its axes
2045
2046         sgMat4 sgTRANS;
2047         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
2048
2049         sgVec3 ship_fwd,ship_rt,ship_up;
2050         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
2051         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
2052         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
2053
2054         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
2055         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
2056         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
2057         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
2058         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
2059         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
2060
2061         sgMat4 sgTUX;
2062         sgCopyMat4( sgTUX, sgROT_hdg );
2063         sgPostMultMat4( sgTUX, sgROT_pitch );
2064         sgPostMultMat4( sgTUX, sgROT_roll );
2065         sgPostMultMat4( sgTUX, sgROT_lat );
2066         sgPostMultMat4( sgTUX, sgROT_lon );
2067         sgPostMultMat4( sgTUX, sgTRANS );
2068
2069         sgCoord shippos;
2070         sgSetCoord(&shippos, sgTUX );
2071         ship_pos[m]->setTransform( &shippos );
2072         // temporary hack for deck lights - ultimately should move to PLib (when ??)
2073         if (m == 1) {
2074             if (lightpoints_transform) {
2075                     lightpoints_transform->setTransform( &shippos );
2076                     float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
2077                     if ( sun_angle > 89 ) {
2078                             lightpoints_brightness->select(0x01);
2079                     } else {
2080                             lightpoints_brightness->select(0x00);
2081                     }
2082             }
2083
2084             float elev;
2085             sgVec3 rp,to;
2086             float *vp;
2087             float alt;
2088             float ref_elev;
2089             sgXformPnt3( rp, rway_ols, sgTUX );
2090             vp = globals->get_current_view()->get_view_pos();
2091             to[0] = rp[0]-vp[0];
2092             to[1] = rp[1]-vp[1];
2093             to[2] = rp[2]-vp[2];
2094             float dist = sgLengthVec3( to );
2095             alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
2096
2097             elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
2098
2099             ref_elev = elev - 3.75; // +ve above, -ve below
2100
2101             unsigned int sel;
2102             sel = 0xFF;
2103 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2104 //              if (ref_elev > 0.51) sel = 0x21;
2105 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
2106 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
2107 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
2108 //              if (ref_elev < -0.51) sel = 0x30;
2109 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2110             // dummy_tile->lightmaps_sequence->select(sel);
2111
2112             sgVec3 up;
2113             sgCopyVec3 (up, ship_up);
2114             if (dist > 750)
2115                     sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
2116             else
2117                     sgScaleVec3 (up, 4.0*ref_elev);
2118             // dummy_tile->ols_transform->setTransform(up);
2119             //cout << "ref_elev  " << ref_elev << endl;
2120         }
2121     // end hack for deck lights
2122
2123     }
2124     if ( ship_sel != NULL ) {
2125         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2126     }
2127 }
2128
2129 // $$$ end - added VS Renganathan, 15 Oct 2K
2130 //           added Venky         , 12 Nov 2K