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