src/Main/main.cxx

   1 // main.cxx -- top level sim routines
   2 //
   3 // Written by Curtis Olson, started May 1997.
   4 //
   5 // Copyright (C) 1997 - 2002  Curtis L. Olson  - curt@flightgear.org
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 //
  21 // $Id$
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include <config.h>
  26 #endif
  27
  28 #if defined(__linux__) && defined(__i386__)
  29 #  include <fpu_control.h>
  30 #  include <signal.h>
  31 #endif
  32
  33 #include <simgear/compiler.h>
  34
  35 #include STL_IOSTREAM
  36 #ifndef SG_HAVE_NATIVE_SGI_COMPILERS
  37 SG_USING_STD(cerr);
  38 SG_USING_STD(endl);
  39 #endif
  40
  41 #include <simgear/misc/exception.hxx>
  42 #include <simgear/ephemeris/ephemeris.hxx>
  43 #include <simgear/route/route.hxx>
  44
  45 #ifdef SG_MATH_EXCEPTION_CLASH
  46 #  include <math.h>
  47 #endif
  48
  49 #ifdef HAVE_WINDOWS_H
  50 #  include <windows.h>
  51 #  include <float.h>
  52 #endif
  53
  54 #include <GL/glut.h>
  55 #include <GL/gl.h>
  56
  57 #include <stdio.h>
  58 #include <string.h>             // for strcmp()
  59 #include <string>
  60
  61 #ifdef HAVE_STDLIB_H
  62 #   include <stdlib.h>
  63 #endif
  64
  65 #ifdef HAVE_SYS_STAT_H
  66 #  include <sys/stat.h>         // for stat()
  67 #endif
  68
  69 #ifdef HAVE_UNISTD_H
  70 #  include <unistd.h>           // for stat()
  71 #endif
  72
  73 #include <plib/netChat.h>
  74 #include <plib/pu.h>
  75 #include <plib/sg.h>
  76 #include <plib/ssg.h>
  77
  78 #include <simgear/constants.h>  // for VERSION
  79 #include <simgear/debug/logstream.hxx>
  80 #include <simgear/math/polar3d.hxx>
  81 #include <simgear/math/sg_random.h>
  82 #include <simgear/misc/sg_path.hxx>
  83 #include <simgear/sky/SkySceneLoader.hpp>
  84 #include <simgear/sky/SkyUtil.hpp>
  85 #include <simgear/sky/sky.hxx>
  86 #include <simgear/timing/sg_time.hxx>
  87
  88 #include <Include/general.hxx>
  89
  90 #include <Aircraft/aircraft.hxx>
  91
  92 #include <ATC/ATCmgr.hxx>
  93 #include <ATC/ATCdisplay.hxx>
  94 //#include <ATC/AIMgr.hxx>
  95
  96
  97 #include <Autopilot/newauto.hxx>
  98
  99 #include <Cockpit/cockpit.hxx>
 100 #include <Cockpit/radiostack.hxx>
 101 #include <Cockpit/steam.hxx>
 102
 103 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 104 #include <GUI/gui.h>
 105 #include <Model/acmodel.hxx>
 106 #include <Model/loader.hxx>
 107 #include <Model/model.hxx>
 108 #include <Model/modelmgr.hxx>
 109 #include <Main/location.hxx>
 110 #ifdef FG_NETWORK_OLK
 111 #include <NetworkOLK/network.h>
 112 #endif
 113 #include <Objects/matlib.hxx>
 114 #include <Scenery/scenery.hxx>
 115 #include <Scenery/tilemgr.hxx>
 116 #ifdef ENABLE_AUDIO_SUPPORT
 117 #  include <Sound/soundmgr.hxx>
 118 #  include <Sound/fg_fx.hxx>
 119 #  include <Sound/morse.hxx>
 120 #endif
 121 #include <Time/FGEventMgr.hxx>
 122 #include <Time/fg_timer.hxx>
 123 #include <Time/light.hxx>
 124 #include <Time/sunpos.hxx>
 125 #include <Time/tmp.hxx>
 126
 127 #include <Input/input.hxx>
 128
 129 // ADA
 130 #include <simgear/misc/sgstream.hxx>
 131 #include <simgear/math/point3d.hxx>
 132 #include <FDM/flight.hxx>
 133 #include <FDM/ADA.hxx>
 134 #include <Scenery/tileentry.hxx>
 135
 136 #if !defined(sgi)
 137 // PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 138 // PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 139 #endif
 140 float default_attenuation[3] = {1.0, 0.0, 0.0};
 141 //Required for using GL_extensions
 142 void fgLoadDCS (void);
 143 void fgUpdateDCS (void);
 144 ssgSelector *ship_sel=NULL;
 145 // upto 32 instances of a same object can be loaded.
 146 ssgTransform *ship_pos[32];
 147 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 148 int objc=0;
 149 ssgSelector *lightpoints_brightness = new ssgSelector;
 150 ssgTransform *lightpoints_transform = new ssgTransform;
 151 FGTileEntry *dummy_tile;
 152 sgVec3 rway_ols;
 153 // ADA
 154 // Clip plane settings...
 155 float scene_nearplane = 0.5f;
 156 float scene_farplane = 120000.0f;
 157
 158 static double delta_time_sec = 0;
 159
 160
 161 #ifdef FG_WEATHERCM
 162 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 163 #else
 164 #  include <Environment/environment_mgr.hxx>
 165 #endif
 166
 167 #include "version.h"
 168
 169 #include "fg_init.hxx"
 170 #include "fg_io.hxx"
 171 #include "fg_props.hxx"
 172 #include "globals.hxx"
 173 #include "splash.hxx"
 174 #include "viewmgr.hxx"
 175 #include "options.hxx"
 176 #include "logger.hxx"
 177
 178 #ifdef macintosh
 179 #  include <console.h>          // -dw- for command line dialog
 180 #endif
 181
 182
 183 FGEventMgr global_events;
 184
 185 // This is a record containing a bit of global housekeeping information
 186 FGGeneral general;
 187
 188 // Specify our current idle function state.  This is used to run all
 189 // our initializations out of the glutIdleLoop() so that we can get a
 190 // splash screen up and running right away.
 191 static int idle_state = 0;
 192 static long global_multi_loop;
 193
 194 // forward declaration
 195 void fgReshape( int width, int height );
 196
 197 // fog constants.  I'm a little nervous about putting actual code out
 198 // here but it seems to work (?)
 199 static const double m_log01 = -log( 0.01 );
 200 static const double sqrt_m_log01 = sqrt( m_log01 );
 201 static GLfloat fog_exp_density;
 202 static GLfloat fog_exp2_density;
 203 static GLfloat fog_exp2_punch_through;
 204
 205 #ifdef FG_NETWORK_OLK
 206 ssgSelector *fgd_sel = NULL;
 207 ssgTransform *fgd_pos = NULL;
 208 #endif
 209
 210 // Sky structures
 211 SGSky *thesky;
 212 SkySceneLoader *sgClouds3d;
 213 bool _bcloud_orig = true;
 214 Point3D posit;
 215 Point3D *_posit = &posit;
 216
 217 // hack
 218 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 219 {
 220   {  1.0f,  0.0f,  0.0f,  0.0f },
 221   {  0.0f,  0.0f, -1.0f,  0.0f },
 222   {  0.0f,  1.0f,  0.0f,  0.0f },
 223   {  0.0f,  0.0f,  0.0f,  1.0f }
 224 };
 225
 226 // The following defines flightgear options. Because glutlib will also
 227 // want to parse its own options, those options must not be included here
 228 // or they will get parsed by the main program option parser. Hence case
 229 // is significant for any option added that might be in conflict with
 230 // glutlib's parser.
 231 //
 232 // glutlib parses for:
 233 //    -display
 234 //    -direct   (invalid in Win32)
 235 //    -geometry
 236 //    -gldebug
 237 //    -iconized
 238 //    -indirect (invalid in Win32)
 239 //    -synce
 240 //
 241 // Note that glutlib depends upon strings while this program's
 242 // option parser wants only initial characters followed by numbers
 243 // or pathnames.
 244 //
 245
 246
 247 ssgSimpleState *default_state;
 248 ssgSimpleState *hud_and_panel;
 249 ssgSimpleState *menus;
 250
 251 SGTimeStamp last_time_stamp;
 252 SGTimeStamp current_time_stamp;
 253
 254 void fgBuildRenderStates( void ) {
 255     default_state = new ssgSimpleState;
 256     default_state->ref();
 257     default_state->disable( GL_TEXTURE_2D );
 258     default_state->enable( GL_CULL_FACE );
 259     default_state->enable( GL_COLOR_MATERIAL );
 260     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 261     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 262     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 263     default_state->disable( GL_BLEND );
 264     default_state->disable( GL_ALPHA_TEST );
 265     default_state->disable( GL_LIGHTING );
 266
 267     hud_and_panel = new ssgSimpleState;
 268     hud_and_panel->ref();
 269     hud_and_panel->disable( GL_CULL_FACE );
 270     hud_and_panel->disable( GL_TEXTURE_2D );
 271     hud_and_panel->disable( GL_LIGHTING );
 272     hud_and_panel->enable( GL_BLEND );
 273
 274     menus = new ssgSimpleState;
 275     menus->ref();
 276     menus->disable( GL_CULL_FACE );
 277     menus->disable( GL_TEXTURE_2D );
 278     menus->enable( GL_BLEND );
 279 }
 280
 281
 282 // fgInitVisuals() -- Initialize various GL/view parameters
 283 void fgInitVisuals( void ) {
 284     fgLIGHT *l;
 285
 286     l = &cur_light_params;
 287
 288 #ifndef GLUT_WRONG_VERSION
 289     // Go full screen if requested ...
 290     if ( fgGetBool("/sim/startup/fullscreen") ) {
 291         glutFullScreen();
 292     }
 293 #endif
 294
 295     // If enabled, normal vectors specified with glNormal are scaled
 296     // to unit length after transformation.  Enabling this has
 297     // performance implications.  See the docs for glNormal.
 298     // glEnable( GL_NORMALIZE );
 299
 300     glEnable( GL_LIGHTING );
 301     glEnable( GL_LIGHT0 );
 302     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 303
 304     sgVec3 sunpos;
 305     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 306     ssgGetLight( 0 ) -> setPosition( sunpos );
 307
 308     glFogi (GL_FOG_MODE, GL_EXP2);
 309     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 310          (!fgGetBool("/sim/rendering/shading"))) {
 311         // if fastest fog requested, or if flat shading force fastest
 312         glHint ( GL_FOG_HINT, GL_FASTEST );
 313     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 314         glHint ( GL_FOG_HINT, GL_NICEST );
 315     }
 316     if ( fgGetBool("/sim/rendering/wireframe") ) {
 317         // draw wire frame
 318         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 319     }
 320
 321     // This is the default anyways, but it can't hurt
 322     glFrontFace ( GL_CCW );
 323
 324     // Just testing ...
 325     // glEnable(GL_POINT_SMOOTH);
 326     // glEnable(GL_LINE_SMOOTH);
 327     // glEnable(GL_POLYGON_SMOOTH);
 328 }
 329
 330
 331 // For HiRes screen Dumps using Brian Pauls TR Library
 332 void trRenderFrame( void ) {
 333
 334     if ( fgPanelVisible() ) {
 335         GLfloat height = fgGetInt("/sim/startup/ysize");
 336         GLfloat view_h =
 337             (current_panel->getViewHeight() - current_panel->getYOffset())
 338             * (height / 768.0) + 1;
 339         glTranslatef( 0.0, view_h, 0.0 );
 340     }
 341
 342     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 343     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 344
 345     fgLIGHT *l = &cur_light_params;
 346
 347     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 348                  l->adj_fog_color[2], l->adj_fog_color[3]);
 349
 350     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 351
 352     // set the opengl state to known default values
 353     default_state->force();
 354
 355     glEnable( GL_FOG );
 356     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 357     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 358     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 359
 360     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 361     // we only update GL_AMBIENT for our lights we will never get
 362     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 363     // explicitely to black.
 364     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 365     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 366
 367     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 368
 369     // texture parameters
 370     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 371     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 372
 373     // we need a white diffuse light for the phase of the moon
 374     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 375     thesky->preDraw();
 376
 377     // draw the ssg scene
 378     // return to the desired diffuse color
 379     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 380     glEnable( GL_DEPTH_TEST );
 381     ssgSetNearFar( scene_nearplane, scene_farplane );
 382     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 383
 384     // draw the lights
 385     glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 386     ssgSetNearFar( scene_nearplane, scene_farplane );
 387     ssgCullAndDraw( globals->get_scenery()->get_lighting() );
 388
 389     if (fgGetBool("/environment/clouds/status"))
 390       thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 391
 392     globals->get_model_mgr()->draw();
 393     globals->get_aircraft_model()->draw();
 394
 395     // need to do this here as hud_and_panel state is static to
 396     // main.cxx  and HUD and Panel routines have to be called with
 397     // knowledge of the the TR struct < see gui.cxx::HighResDump()
 398     hud_and_panel->apply();
 399 }
 400
 401
 402 // Update all Visuals (redraws anything graphics related)
 403 void fgRenderFrame() {
 404
 405     // Process/manage pending events
 406     global_events.update( delta_time_sec );
 407
 408     static const SGPropertyNode *longitude
 409         = fgGetNode("/position/longitude-deg");
 410     static const SGPropertyNode *latitude
 411         = fgGetNode("/position/latitude-deg");
 412     static const SGPropertyNode *altitude
 413         = fgGetNode("/position/altitude-ft");
 414     static const SGPropertyNode *groundlevel_nearplane
 415         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 416
 417     // Update the default (kludged) properties.
 418     fgUpdateProps();
 419
 420     FGViewer *current__view = globals->get_current_view();
 421
 422     fgLIGHT *l = &cur_light_params;
 423     static double last_visibility = -9999;
 424
 425     // update fog params
 426     double actual_visibility       = thesky->get_visibility();
 427     if ( actual_visibility != last_visibility ) {
 428         last_visibility = actual_visibility;
 429
 430         fog_exp_density = m_log01 / actual_visibility;
 431         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 432         fog_exp2_punch_through = sqrt_m_log01 / ( actual_visibility * 2.5 );
 433     }
 434
 435     // double angle;
 436     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 437     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 438     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 439     // GLfloat mat_shininess[] = { 10.0 };
 440     GLbitfield clear_mask;
 441
 442     if ( idle_state != 1000 ) {
 443         // still initializing, draw the splash screen
 444         if ( fgGetBool("/sim/startup/splash-screen") ) {
 445             fgSplashUpdate(0.0);
 446         }
 447         // Keep resetting sim time while the sim is initializing
 448         globals->set_sim_time_sec( 0.0 );
 449     } else {
 450         // idle_state is now 1000 meaning we've finished all our
 451         // initializations and are running the main loop, so this will
 452         // now work without seg faulting the system.
 453
 454         // calculate our current position in cartesian space
 455         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 456
 457         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 458             posit =  globals->get_scenery()->get_center();
 459             if ( _bcloud_orig ) {
 460                 sgClouds3d->Set_Cloud_Orig( _posit );
 461                 _bcloud_orig = false;
 462             }
 463             /* sgClouds3d->Update( (sgVec4 *)current__view->get_cloud_VIEW(),
 464                                 _posit );
 465             */
 466         }
 467
 468         // update view port
 469         fgReshape( fgGetInt("/sim/startup/xsize"),
 470                    fgGetInt("/sim/startup/ysize") );
 471
 472         // set the sun position (done later with ssg calls)
 473         // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 474
 475         clear_mask = GL_DEPTH_BUFFER_BIT;
 476         if ( fgGetBool("/sim/rendering/wireframe") ) {
 477             clear_mask |= GL_COLOR_BUFFER_BIT;
 478         }
 479
 480         if ( fgGetBool("/sim/rendering/skyblend") ) {
 481             if ( fgGetBool("/sim/rendering/textures") ) {
 482                 // glClearColor(black[0], black[1], black[2], black[3]);
 483                 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 484                              l->adj_fog_color[2], l->adj_fog_color[3]);
 485                 clear_mask |= GL_COLOR_BUFFER_BIT;
 486             }
 487         } else {
 488             glClearColor(l->sky_color[0], l->sky_color[1],
 489                          l->sky_color[2], l->sky_color[3]);
 490             clear_mask |= GL_COLOR_BUFFER_BIT;
 491         }
 492         glClear( clear_mask );
 493
 494         // Tell GL we are switching to model view parameters
 495
 496         // I really should create a derived ssg node or use a call
 497         // back or something so that I can draw the sky within the
 498         // ssgCullAndDraw() function, but for now I just mimic what
 499         // ssg does to set up the model view matrix
 500         glMatrixMode(GL_MODELVIEW);
 501         glLoadIdentity();
 502         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 503
 504         // set the opengl state to known default values
 505         default_state->force();
 506
 507         // update fog params if visibility has changed
 508         double visibility_meters = fgGetDouble("/environment/visibility-m");
 509         thesky->set_visibility(visibility_meters);
 510
 511         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 512                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 513                             / (double)fgGetInt("/sim/model-hz") );
 514
 515         // Set correct opengl fog density
 516         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 517
 518         // update the sky dome
 519         if ( fgGetBool("/sim/rendering/skyblend") ) {
 520             /* cout << "thesky->repaint() sky_color = "
 521                  << cur_light_params.sky_color[0] << " "
 522                  << cur_light_params.sky_color[1] << " "
 523                  << cur_light_params.sky_color[2] << " "
 524                  << cur_light_params.sky_color[3] << endl;
 525             cout << "    fog = "
 526                  << cur_light_params.fog_color[0] << " "
 527                  << cur_light_params.fog_color[1] << " "
 528                  << cur_light_params.fog_color[2] << " "
 529                  << cur_light_params.fog_color[3] << endl;
 530             cout << "    sun_angle = " << cur_light_params.sun_angle
 531                  << "    moon_angle = " << cur_light_params.moon_angle
 532                  << endl; */
 533             thesky->repaint( cur_light_params.sky_color,
 534                              cur_light_params.adj_fog_color,
 535                              cur_light_params.sun_angle,
 536                              cur_light_params.moon_angle,
 537                              globals->get_ephem()->getNumPlanets(),
 538                              globals->get_ephem()->getPlanets(),
 539                              globals->get_ephem()->getNumStars(),
 540                              globals->get_ephem()->getStars() );
 541
 542             /* cout << "thesky->reposition( view_pos = " << view_pos[0] << " "
 543                  << view_pos[1] << " " << view_pos[2] << endl;
 544             cout << "    zero_elev = " << zero_elev[0] << " "
 545                  << zero_elev[1] << " " << zero_elev[2]
 546                  << " lon = " << cur_fdm_state->get_Longitude()
 547                  << " lat = " << cur_fdm_state->get_Latitude() << endl;
 548             cout << "    sun_rot = " << cur_light_params.sun_rotation
 549                  << " gst = " << SGTime::cur_time_params->getGst() << endl;
 550             cout << "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 551                  << " sun dec = " << globals->get_ephem()->getSunDeclination()
 552                  << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 553                  << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 554
 555             thesky->reposition( current__view->get_view_pos(),
 556                                 current__view->get_zero_elev(),
 557                                 current__view->get_world_up(),
 558                                 current__view->getLongitude_deg()
 559                                   * SGD_DEGREES_TO_RADIANS,
 560                                 current__view->getLatitude_deg()
 561                                   * SGD_DEGREES_TO_RADIANS,
 562                                 current__view->getAltitudeASL_ft() * SG_FEET_TO_METER,
 563                                 cur_light_params.sun_rotation,
 564                                 globals->get_time_params()->getGst(),
 565                                 globals->get_ephem()->getSunRightAscension(),
 566                                 globals->get_ephem()->getSunDeclination(),
 567                                 50000.0,
 568                                 globals->get_ephem()->getMoonRightAscension(),
 569                                 globals->get_ephem()->getMoonDeclination(),
 570                                 50000.0 );
 571         }
 572
 573         glEnable( GL_DEPTH_TEST );
 574         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 575             glEnable( GL_FOG );
 576             glFogi( GL_FOG_MODE, GL_EXP2 );
 577             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 578         }
 579
 580         // set sun/lighting parameters
 581         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 582
 583         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 584         // we only update GL_AMBIENT for our lights we will never get
 585         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 586         // explicitely to black.
 587         GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 588         GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 589         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 590
 591         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 592         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 593         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 594
 595         // texture parameters
 596         // glEnable( GL_TEXTURE_2D );
 597         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 598         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 599
 600         // glMatrixMode( GL_PROJECTION );
 601         // glLoadIdentity();
 602         ssgSetFOV( current__view->get_h_fov(),
 603                    current__view->get_v_fov() );
 604
 605         double agl =
 606             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 607             - globals->get_scenery()->get_cur_elev();
 608
 609         if ( agl > 10.0 ) {
 610             scene_nearplane = 10.0f;
 611             scene_farplane = 120000.0f;
 612         } else {
 613             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 614             scene_farplane = 120000.0f;
 615         }
 616
 617         ssgSetNearFar( scene_nearplane, scene_farplane );
 618
 619         // $$$ begin - added VS Renganthan 17 Oct 2K
 620         if(objc)
 621           fgUpdateDCS();
 622         // $$$ end - added VS Renganthan 17 Oct 2K
 623
 624 # ifdef FG_NETWORK_OLK
 625         if ( fgGetBool("/sim/networking/network-olk") ) {
 626             sgCoord fgdpos;
 627             other = head->next;             /* put listpointer to start  */
 628             while ( other != tail) {        /* display all except myself */
 629                 if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 630                     other->fgd_sel->select(1);
 631                     sgSetCoord( &fgdpos, other->sgFGD_COORD );
 632                     other->fgd_pos->setTransform( &fgdpos );
 633                 }
 634                 other = other->next;
 635             }
 636
 637             // fgd_sel->select(1);
 638             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 639             // sgCoord fgdpos;
 640             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 641             // fgd_pos->setTransform( &fgdpos);
 642         }
 643 # endif
 644
 645         // position tile nodes and update range selectors
 646
 647         // this is done in the main loop now...
 648         // global_tile_mgr.prep_ssg_nodes(visibility_meters);
 649
 650         if ( fgGetBool("/sim/rendering/skyblend") ) {
 651             // draw the sky backdrop
 652
 653             // we need a white diffuse light for the phase of the moon
 654             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 655
 656             thesky->preDraw();
 657
 658             // return to the desired diffuse color
 659             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 660         }
 661
 662         // draw the ssg scene
 663         glEnable( GL_DEPTH_TEST );
 664
 665         ssgSetNearFar( scene_nearplane, scene_farplane );
 666         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 667
 668         // This is a bit kludgy.  Every 200 frames, do an extra
 669         // traversal of the scene graph without drawing anything, but
 670         // with the field-of-view set to 360x360 degrees.  This
 671         // ensures that out-of-range random objects that are not in
 672         // the current view frustum will still be freed properly.
 673         static int counter = 0;
 674         counter++;
 675         if (counter == 200) {
 676           sgFrustum f;
 677           f.setFOV(360, 360);
 678                                 // No need to put the near plane too close;
 679                                 // this way, at least the aircraft can be
 680                                 // culled.
 681           f.setNearFar(1000, 1000000);
 682           sgMat4 m;
 683           ssgGetModelviewMatrix(m);
 684           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 685           counter = 0;
 686         }
 687
 688         // change state for lighting here
 689
 690         // draw lighting
 691         // Set punch through fog density
 692         glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 693
 694 #ifdef FG_EXPERIMENTAL_LIGHTING
 695         // Enable states for drawing points with GL_extension
 696         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 697             glEnable(GL_POINT_SMOOTH);
 698             float quadratic[3] = {1.0, 0.01, 0.0001};
 699             // get the address of our OpenGL extensions
 700 #if !defined(sgi)
 701             glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
 702                 wglGetProcAddress("glPointParameterfEXT");
 703             glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
 704                 wglGetProcAddress("glPointParameterfvEXT");
 705 #endif
 706             // makes the points fade as they move away
 707             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 708             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 709             glPointSize(4.0);
 710
 711             // Enable states for drawing runway lights with spherical mapping
 712             glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 713             glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 714             glEnable(GL_TEXTURE_GEN_S);
 715             glEnable(GL_TEXTURE_GEN_T);
 716
 717             //Maybe this is not the best way, but it works !!
 718             glPolygonMode(GL_FRONT, GL_POINT);
 719             glCullFace(GL_BACK);
 720             glEnable(GL_CULL_FACE);
 721         }
 722
 723         glDisable( GL_LIGHTING );
 724         // blending function for runway lights
 725         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 726         glEnable(GL_BLEND);
 727 #endif
 728
 729         ssgSetNearFar( scene_nearplane, scene_farplane );
 730         ssgCullAndDraw( globals->get_scenery()->get_lighting() );
 731
 732         //static int _frame_count = 0;
 733         //if (_frame_count % 30 == 0) {
 734         //  printf("SSG: %s\n", ssgShowStats());
 735         //}
 736         //else {
 737         //  ssgShowStats();
 738         //}
 739         //_frame_count++;
 740
 741
 742 #ifdef FG_EXPERIMENTAL_LIGHTING
 743         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 744             // Disable states used for runway lighting
 745             glPolygonMode(GL_FRONT, GL_FILL);
 746
 747             glDisable(GL_TEXTURE_GEN_S);
 748             glDisable(GL_TEXTURE_GEN_T);
 749             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 750                                   default_attenuation);
 751         }
 752
 753         glPointSize(1.0);
 754 #endif
 755
 756         if ( fgGetBool("/sim/rendering/skyblend") ) {
 757             // draw the sky cloud layers
 758             if (fgGetBool("/environment/clouds/status")) {
 759                 thesky->postDraw( cur_fdm_state->get_Altitude()
 760                                   * SG_FEET_TO_METER );
 761             }
 762         }
 763
 764         globals->get_model_mgr()->draw();
 765         globals->get_aircraft_model()->draw();
 766
 767         // draw the 3D clouds
 768         if ( fgGetBool("/sim/rendering/clouds3d") ) sgClouds3d->Draw();
 769
 770         // display HUD && Panel
 771         glDisable( GL_FOG );
 772         glDisable( GL_DEPTH_TEST );
 773         // glDisable( GL_CULL_FACE );
 774         // glDisable( GL_TEXTURE_2D );
 775
 776         // update the input subsystem
 777         current_input.update(delta_time_sec);
 778
 779         // update the controls subsystem
 780         globals->get_controls()->update(delta_time_sec);
 781
 782         hud_and_panel->apply();
 783         fgCockpitUpdate();
 784
 785         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 786         // This only works properly if called before the panel call
 787         globals->get_ATC_display()->update(delta_time_sec);
 788
 789         // update the panel subsystem
 790         if ( current_panel != NULL ) {
 791             current_panel->update(delta_time_sec);
 792         }
 793
 794         // We can do translucent menus, so why not. :-)
 795         menus->apply();
 796         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 797         puDisplay();
 798         // glDisable ( GL_BLEND ) ;
 799
 800         // glEnable( GL_FOG );
 801
 802         globals->get_logger()->update(delta_time_sec);
 803     }
 804
 805     glutSwapBuffers();
 806 }
 807
 808
 809 // Update internal time dependent calculations (i.e. flight model)
 810 // FIXME: this distinction is obsolete; all subsystems now get delta
 811 // time on update.
 812 void fgUpdateTimeDepCalcs() {
 813     static bool inited = false;
 814
 815     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 816
 817     fgLIGHT *l = &cur_light_params;
 818     int i;
 819
 820     long multi_loop = 1;
 821
 822     // Initialize the FDM here if it hasn't been and if we have a
 823     // scenery elevation hit.
 824
 825     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 826     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 827
 828     if ( !cur_fdm_state->get_inited() &&
 829          globals->get_scenery()->get_cur_elev() > -9990 )
 830     {
 831         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 832
 833         cur_fdm_state->init();
 834         if ( cur_fdm_state->get_bound() ) {
 835             cur_fdm_state->unbind();
 836         }
 837         cur_fdm_state->bind();
 838     }
 839
 840     // conceptually, the following block could be done for each fdm
 841     // instance ...
 842     if ( !cur_fdm_state->get_inited() ) {
 843         // do nothing, fdm isn't inited yet
 844     } else {
 845         // we have been inited, and  we are good to go ...
 846
 847         if ( !inited ) {
 848             inited = true;
 849         }
 850
 851         globals->get_autopilot()->update(delta_time_sec);
 852         cur_fdm_state->update(delta_time_sec);
 853         globals->get_steam()->update(delta_time_sec);
 854     }
 855
 856     globals->get_model_mgr()->update(delta_time_sec);
 857     globals->get_aircraft_model()->update(delta_time_sec);
 858
 859     // update the view angle
 860     globals->get_viewmgr()->update(delta_time_sec);
 861
 862     l->UpdateAdjFog();
 863
 864     // Update solar system
 865     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 866                                   globals->get_time_params()->getLst(),
 867                                   cur_fdm_state->get_Latitude() );
 868
 869     // Update radio stack model
 870     current_radiostack->update(delta_time_sec);
 871 }
 872
 873
 874 void fgInitTimeDepCalcs( void ) {
 875     // noop for now
 876 }
 877
 878
 879 static const double alt_adjust_ft = 3.758099;
 880 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 881
 882
 883 // What should we do when we have nothing else to do?  Let's get ready
 884 // for the next move and update the display?
 885 static void fgMainLoop( void ) {
 886
 887     // Update the elapsed time.
 888     static bool first_time = true;
 889     if ( first_time ) {
 890         last_time_stamp.stamp();
 891         first_time = false;
 892     }
 893     current_time_stamp.stamp();
 894     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 895     last_time_stamp = current_time_stamp;
 896     globals->inc_sim_time_sec( delta_time_sec );
 897
 898     static const SGPropertyNode *longitude
 899         = fgGetNode("/position/longitude-deg");
 900     static const SGPropertyNode *latitude
 901         = fgGetNode("/position/latitude-deg");
 902     static const SGPropertyNode *altitude
 903         = fgGetNode("/position/altitude-ft");
 904     static const SGPropertyNode *clock_freeze
 905         = fgGetNode("/sim/freeze/clock", true);
 906     static const SGPropertyNode *cur_time_override
 907         = fgGetNode("/sim/time/cur-time-override", true);
 908
 909     static long remainder = 0;
 910     long elapsed;
 911 #ifdef FANCY_FRAME_COUNTER
 912     int i;
 913     double accum;
 914 #else
 915     static time_t last_time = 0;
 916     static int frames = 0;
 917 #endif // FANCY_FRAME_COUNTER
 918
 919     SGTime *t = globals->get_time_params();
 920
 921     FGLocation * acmodel_location = 0;
 922     if(cur_fdm_state->getACModel() != 0) {
 923       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
 924     }
 925
 926     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 927     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 928
 929 #ifdef FG_NETWORK_OLK
 930     if ( fgGetBool("/sim/networking/network-olk") ) {
 931         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
 932             // printf("FGD: Netupdate\n");
 933             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
 934             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
 935         }
 936     }
 937 #endif
 938
 939 #if defined( ENABLE_PLIB_JOYSTICK )
 940     // Read joystick and update control settings
 941     // if ( fgGetString("/sim/control-mode") == "joystick" )
 942     // {
 943     //    fgJoystickRead();
 944     // }
 945 #elif defined( ENABLE_GLUT_JOYSTICK )
 946     // Glut joystick support works by feeding a joystick handler
 947     // function to glut.  This is taken care of once in the joystick
 948     // init routine and we don't have to worry about it again.
 949 #endif
 950
 951 #ifndef FG_WEATHERCM
 952     globals->get_environment_mgr()->update(delta_time_sec);
 953 #endif
 954
 955     // Fix elevation.  I'm just sticking this here for now, it should
 956     // probably move eventually
 957
 958     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
 959            scenery.get_cur_elev(),
 960            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 961            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 962
 963 // Curt is this code used?  I don't see any problems when I comment it out.
 964     if ( acmodel_location != 0 ) {
 965       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
 966         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
 967              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
 968             // now set aircraft altitude above ground
 969             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
 970                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 971                    acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
 972                    acmodel_location->get_cur_elev_m() + alt_adjust_m );
 973             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
 974                                                 + alt_adjust_m) * SG_METER_TO_FEET );
 975             SG_LOG( SG_ALL, SG_DEBUG,
 976                     "<*> resetting altitude to "
 977                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
 978                     << " meters" );
 979         }
 980       }
 981     }
 982 // End of code in question. (see Curt is this code used? above)
 983
 984     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
 985            scenery.get_cur_elev(),
 986            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 987            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 988
 989     // cout << "Warp = " << globals->get_warp() << endl;
 990
 991     // update "time"
 992     static bool last_clock_freeze = false;
 993
 994     if ( clock_freeze->getBoolValue() ) {
 995         // clock freeze requested
 996         if ( cur_time_override->getLongValue() == 0 ) {
 997             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
 998             globals->set_warp( 0 );
 999         }
1000     } else {
1001         // no clock freeze requested
1002         if ( last_clock_freeze == true ) {
1003             // clock just unfroze, let's set warp as the difference
1004             // between frozen time and current time so we don't get a
1005             // time jump (and corresponding sky object and lighting
1006             // jump.)
1007             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
1008             fgSetLong( "/sim/time/cur-time-override", 0 );
1009         }
1010         if ( globals->get_warp_delta() != 0 ) {
1011             globals->inc_warp( globals->get_warp_delta() );
1012         }
1013     }
1014
1015     last_clock_freeze = clock_freeze->getBoolValue();
1016
1017     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1018                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1019                cur_time_override->getLongValue(),
1020                globals->get_warp() );
1021
1022     if ( globals->get_warp_delta() != 0 ) {
1023         fgUpdateSkyAndLightingParams();
1024     }
1025
1026     // update magvar model
1027     globals->get_mag()->update( longitude->getDoubleValue()
1028                                   * SGD_DEGREES_TO_RADIANS,
1029                                 latitude->getDoubleValue()
1030                                   * SGD_DEGREES_TO_RADIANS,
1031                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
1032                                 globals->get_time_params()->getJD() );
1033
1034     // Get elapsed time (in usec) for this past frame
1035     elapsed = fgGetTimeInterval();
1036     SG_LOG( SG_ALL, SG_DEBUG,
1037             "Elapsed time interval is = " << elapsed
1038             << ", previous remainder is = " << remainder );
1039
1040     // Calculate frame rate average
1041 #ifdef FANCY_FRAME_COUNTER
1042     /* old fps calculation */
1043     if ( elapsed > 0 ) {
1044         double tmp;
1045         accum = 0.0;
1046         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1047             tmp = general.get_frame(i);
1048             accum += tmp;
1049             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1050             general.set_frame(i+1,tmp);
1051         }
1052         tmp = 1000000.0 / (float)elapsed;
1053         general.set_frame(0,tmp);
1054         // printf("frame[0] = %.2f\n", general.frames[0]);
1055         accum += tmp;
1056         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1057         // printf("ave = %.2f\n", general.frame_rate);
1058     }
1059 #else
1060     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1061         general.set_frame_rate( frames );
1062         SG_LOG( SG_ALL, SG_DEBUG,
1063                 "--> Frame rate is = " << general.get_frame_rate() );
1064         frames = 0;
1065     }
1066     last_time = t->get_cur_time();
1067     ++frames;
1068 #endif
1069
1070     // Run ATC subsystem
1071     globals->get_ATC_mgr()->update(delta_time_sec);
1072
1073     // Run the AI subsystem
1074     // globals->get_AI_mgr()->update(delta_time_sec);
1075
1076     // Run flight model
1077
1078     // Calculate model iterations needed for next frame
1079     elapsed += remainder;
1080
1081     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1082                               fgGetInt("/sim/model-hz"));
1083     remainder = elapsed - ( (global_multi_loop*1000000) /
1084                             fgGetInt("/sim/model-hz") );
1085     SG_LOG( SG_ALL, SG_DEBUG,
1086             "Model iterations needed = " << global_multi_loop
1087             << ", new remainder = " << remainder );
1088
1089     // chop max interations to something reasonable if the sim was
1090     // delayed for an excesive amount of time
1091     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1092         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1093         remainder = 0;
1094     }
1095
1096     // flight model
1097     if ( global_multi_loop > 0 ) {
1098         fgUpdateTimeDepCalcs();
1099     } else {
1100         SG_LOG( SG_ALL, SG_DEBUG,
1101                 "Elapsed time is zero ... we're zinging" );
1102     }
1103
1104     // Do any I/O channel work that might need to be done
1105     globals->get_io()->update( delta_time_sec );
1106
1107     // see if we need to load any deferred-load textures
1108     material_lib.load_next_deferred();
1109
1110     // Run audio scheduler
1111 #ifdef ENABLE_AUDIO_SUPPORT
1112     if ( fgGetBool("/sim/sound/audible")
1113            && globals->get_soundmgr()->is_working() ) {
1114         globals->get_fx()->update( delta_time_sec );
1115         globals->get_soundmgr()->update( delta_time_sec );
1116     }
1117 #endif
1118
1119     //
1120     // Tile Manager updates - see if we need to load any new scenery tiles.
1121     //   this code ties together the fdm, viewer and scenery classes...
1122     //   we may want to move this to it's own class at some point
1123     //
1124     double visibility_meters = fgGetDouble("/environment/visibility-m");
1125     FGViewer *current_view = globals->get_current_view();
1126
1127     // update tile manager for FDM...
1128     // ...only if location is different than the viewer (to avoid duplicating effort)
1129     if( acmodel_location != current_view->getFGLocation() ) {
1130       if( acmodel_location != 0 ) {
1131         global_tile_mgr.prep_ssg_nodes(visibility_meters,
1132                acmodel_location->get_world_up(),
1133                acmodel_location->get_tile_center());
1134         global_tile_mgr.update( acmodel_location->getLongitude_deg(),
1135                             acmodel_location->getLatitude_deg(),
1136                             visibility_meters,
1137                             acmodel_location->get_absolute_view_pos(),
1138                             acmodel_location->get_current_bucket(),
1139                             acmodel_location->get_previous_bucket(),
1140                             acmodel_location->get_tile_center()
1141                             );
1142         // save results of update in FGLocation for fdm...
1143         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1144           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1145         }
1146         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1147         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1148         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1149       }
1150     }
1151
1152     global_tile_mgr.prep_ssg_nodes(visibility_meters,
1153        current_view->getFGLocation()->get_world_up(),
1154        current_view->getFGLocation()->get_tile_center());
1155     // update tile manager for view...
1156     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1157     // after the FDM's until all of Flight Gear code references the viewer's location
1158     // for elevation instead of the "scenery's" current elevation.
1159     global_tile_mgr.update( current_view->getLongitude_deg(),
1160                             current_view->getLatitude_deg(),
1161                             visibility_meters,
1162                             current_view->get_absolute_view_pos(),
1163                             current_view->getFGLocation()->get_current_bucket(),
1164                             current_view->getFGLocation()->get_previous_bucket(),
1165                             current_view->getFGLocation()->get_tile_center()
1166                             );
1167     // save results of update in FGLocation for fdm...
1168     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1169       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1170     }
1171     current_view->getFGLocation()->set_current_bucket( global_tile_mgr.get_current_bucket() );
1172     current_view->getFGLocation()->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1173     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1174
1175     // If fdm location is same as viewer's then we didn't do the update for fdm location
1176     //   above so we need to save the viewer results in the fdm FGLocation as well...
1177     if( acmodel_location == current_view->getFGLocation() ) {
1178       if( acmodel_location != 0 ) {
1179         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1180           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1181         }
1182         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1183         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1184         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1185       }
1186     }
1187
1188     // END Tile Manager udpates
1189
1190     // redraw display
1191     fgRenderFrame();
1192
1193     SG_LOG( SG_ALL, SG_DEBUG, "" );
1194 }
1195
1196
1197 // This is the top level master main function that is registered as
1198 // our idle funciton
1199
1200 // The first few passes take care of initialization things (a couple
1201 // per pass) and once everything has been initialized fgMainLoop from
1202 // then on.
1203
1204 static void fgIdleFunction ( void ) {
1205     // printf("idle state == %d\n", idle_state);
1206
1207     if ( idle_state == 0 ) {
1208         // Initialize the splash screen right away
1209         if ( fgGetBool("/sim/startup/splash-screen") ) {
1210             fgSplashInit();
1211         }
1212
1213         idle_state++;
1214     } else if ( idle_state == 1 ) {
1215         // Initialize audio support
1216 #ifdef ENABLE_AUDIO_SUPPORT
1217
1218         // Start the intro music
1219         if ( fgGetBool("/sim/startup/intro-music") ) {
1220             SGPath mp3file( globals->get_fg_root() );
1221             mp3file.append( "Sounds/intro.mp3" );
1222
1223             SG_LOG( SG_GENERAL, SG_INFO,
1224                     "Starting intro music: " << mp3file.str() );
1225
1226 #if defined( __CYGWIN__ )
1227             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1228 #elif defined( WIN32 )
1229             string command = "start /m " + mp3file.str();
1230 #else
1231             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1232 #endif
1233
1234             system ( command.c_str() );
1235         }
1236 #endif
1237
1238         idle_state++;
1239     } else if ( idle_state == 2 ) {
1240         // These are a few miscellaneous things that aren't really
1241         // "subsystems" but still need to be initialized.
1242
1243 #ifdef USE_GLIDE
1244         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1245             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1246         }
1247 #endif
1248
1249         idle_state++;
1250     } else if ( idle_state == 3 ) {
1251         // This is the top level init routine which calls all the
1252         // other subsystem initialization routines.  If you are adding
1253         // a subsystem to flightgear, its initialization call should
1254         // located in this routine.
1255         if( !fgInitSubsystems()) {
1256             SG_LOG( SG_GENERAL, SG_ALERT,
1257                     "Subsystem initializations failed ..." );
1258             exit(-1);
1259         }
1260
1261         idle_state++;
1262     } else if ( idle_state == 4 ) {
1263         // setup OpenGL view parameters
1264         fgInitVisuals();
1265
1266         idle_state++;
1267     } else if ( idle_state == 5 ) {
1268
1269         idle_state++;
1270     } else if ( idle_state == 6 ) {
1271         // sleep(1);
1272         idle_state = 1000;
1273
1274         cout << "Panel visible = " << fgPanelVisible() << endl;
1275         fgReshape( fgGetInt("/sim/startup/xsize"),
1276                    fgGetInt("/sim/startup/ysize") );
1277     }
1278
1279     if ( idle_state == 1000 ) {
1280         // We've finished all our initialization steps, from now on we
1281         // run the main loop.
1282
1283         glutIdleFunc(fgMainLoop);
1284     } else {
1285         if ( fgGetBool("/sim/startup/splash-screen") ) {
1286             fgSplashUpdate(0.0);
1287         }
1288     }
1289 }
1290
1291 // options.cxx needs to see this for toggle_panel()
1292 // Handle new window size or exposure
1293 void fgReshape( int width, int height ) {
1294     int view_h;
1295
1296     if ( (!fgGetBool("/sim/virtual-cockpit"))
1297          && fgPanelVisible() && idle_state == 1000 ) {
1298         view_h = (int)(height * (current_panel->getViewHeight() -
1299                                  current_panel->getYOffset()) / 768.0);
1300     } else {
1301         view_h = height;
1302     }
1303
1304     // for all views
1305     FGViewMgr *viewmgr = globals->get_viewmgr();
1306     for ( int i = 0; i < viewmgr->size(); ++i ) {
1307       viewmgr->get_view(i)->
1308         set_aspect_ratio((float)view_h / (float)width);
1309     }
1310
1311     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1312
1313     fgSetInt("/sim/startup/xsize", width);
1314     fgSetInt("/sim/startup/ysize", height);
1315     guiInitMouse(width, height);
1316
1317     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1318                viewmgr->get_current_view()->get_v_fov() );
1319
1320     fgHUDReshape();
1321     sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
1322                         viewmgr->get_current_view()->get_v_fov() );
1323 }
1324
1325 // Initialize GLUT and define a main window
1326 int fgGlutInit( int *argc, char **argv ) {
1327
1328 #if !defined( macintosh )
1329     // GLUT will extract all glut specific options so later on we only
1330     // need wory about our own.
1331     glutInit(argc, argv);
1332 #endif
1333
1334     // Define Display Parameters
1335     glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_ALPHA);
1336
1337     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1338             fgGetInt("/sim/startup/xsize") << "x"
1339             << fgGetInt("/sim/startup/ysize") );
1340
1341     // Define initial window size
1342     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1343                         fgGetInt("/sim/startup/ysize") );
1344
1345     // Initialize windows
1346     if ( !fgGetBool("/sim/startup/game-mode")) {
1347         // Open the regular window
1348         glutCreateWindow("FlightGear");
1349 #ifndef GLUT_WRONG_VERSION
1350     } else {
1351         // Open the cool new 'game mode' window
1352         char game_mode_str[256];
1353 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1354 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1355 #ifndef ENUM_CURRENT_SETTINGS
1356 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1357 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1358 #endif
1359
1360         DEVMODE dm;
1361         dm.dmSize = sizeof(DEVMODE);
1362         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1363         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1364         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1365         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1366                                                 fgGetInt("/sim/startup/ysize") );
1367         sprintf( game_mode_str, "%dx%d:%d@%d",
1368                          dm.dmPelsWidth,
1369                          dm.dmPelsHeight,
1370                          dm.dmBitsPerPel,
1371                          dm.dmDisplayFrequency );
1372 #else
1373         // Open the cool new 'game mode' window
1374         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1375                  fgGetInt("/sim/startup/xsize"),
1376                  fgGetInt("/sim/startup/ysize"),
1377                  fgGetInt("/sim/rendering/bits-per-pixel"));
1378
1379 #endif // HAVE_WINDOWS_H
1380         SG_LOG( SG_GENERAL, SG_INFO,
1381                 "game mode params = " << game_mode_str );
1382         glutGameModeString( game_mode_str );
1383         glutEnterGameMode();
1384 #endif // GLUT_WRONG_VERSION
1385     }
1386
1387     // This seems to be the absolute earliest in the init sequence
1388     // that these calls will return valid info.  Too bad it's after
1389     // we've already created and sized out window. :-(
1390     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1391     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1392     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1393     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1394
1395     GLint tmp;
1396     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1397     general.set_glMaxTexSize( tmp );
1398     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1399
1400     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1401     general.set_glDepthBits( tmp );
1402     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1403
1404     return 1;
1405 }
1406
1407
1408 // Initialize GLUT event handlers
1409 int fgGlutInitEvents( void ) {
1410     // call fgReshape() on window resizes
1411     glutReshapeFunc( fgReshape );
1412
1413     // keyboard and mouse callbacks are set in FGInput::init
1414
1415     // call fgMainLoop() whenever there is
1416     // nothing else to do
1417     glutIdleFunc( fgIdleFunction );
1418
1419     // draw the scene
1420     glutDisplayFunc( fgRenderFrame );
1421
1422     return 1;
1423 }
1424
1425
1426 // Main loop
1427 int mainLoop( int argc, char **argv ) {
1428
1429 #if defined( macintosh )
1430     freopen ("stdout.txt", "w", stdout );
1431     freopen ("stderr.txt", "w", stderr );
1432     argc = ccommand( &argv );
1433 #endif
1434
1435     // set default log levels
1436     sglog().setLogLevels( SG_ALL, SG_INFO );
1437
1438     string version;
1439 #ifdef FLIGHTGEAR_VERSION
1440     version = FLIGHTGEAR_VERSION;
1441 #else
1442     version = "unknown version";
1443 #endif
1444     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1445             << version );
1446     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1447
1448     // Allocate global data structures.  This needs to happen before
1449     // we parse command line options
1450
1451     globals = new FGGlobals;
1452
1453 #ifndef FG_WEATHERCM
1454     globals->set_environment_mgr(new FGEnvironmentMgr);
1455 #endif
1456
1457     // seed the random number generater
1458     sg_srandom_time();
1459
1460     SGRoute *route = new SGRoute;
1461     globals->set_route( route );
1462
1463     FGControls *controls = new FGControls;
1464     globals->set_controls( controls );
1465
1466     FGSteam *steam = new FGSteam;
1467     globals->set_steam( steam );
1468
1469     string_list *col = new string_list;
1470     globals->set_channel_options_list( col );
1471
1472     // Scan the config file(s) and command line options to see if
1473     // fg_root was specified (ignore all other options for now)
1474     fgInitFGRoot(argc, argv);
1475
1476     // Check for the correct base package version
1477     static char required_version[] = "0.7.11pre1";
1478     string base_version = fgBasePackageVersion();
1479     if ( !(base_version == required_version) ) {
1480         // tell the operator how to use this application
1481         fgUsage();
1482
1483         SG_LOG( SG_GENERAL, SG_ALERT, "Base package check failed ... "
1484                 << "Found version " << base_version << " at: "
1485                 << globals->get_fg_root() );
1486         SG_LOG( SG_GENERAL, SG_ALERT, "Please upgrade to version"
1487                 << required_version);
1488         exit(-1);
1489     }
1490
1491     // Initialize the Aircraft directory to "" (UIUC)
1492     aircraft_dir = "";
1493
1494     // Load the configuration parameters
1495     if ( !fgInitConfig(argc, argv) ) {
1496         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1497         exit(-1);
1498     }
1499
1500     // Initialize the Window/Graphics environment.
1501     if( !fgGlutInit(&argc, argv) ) {
1502         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1503         exit(-1);
1504     }
1505
1506     // Initialize the various GLUT Event Handlers.
1507     if( !fgGlutInitEvents() ) {
1508         SG_LOG( SG_GENERAL, SG_ALERT,
1509                 "GLUT event handler initialization failed ..." );
1510         exit(-1);
1511     }
1512
1513     // Initialize plib net interface
1514     netInit( &argc, argv );
1515
1516     // Initialize ssg (from plib).  Needs to come before we do any
1517     // other ssg stuff, but after opengl/glut has been initialized.
1518     ssgInit();
1519
1520     // Initialize the user interface (we need to do this before
1521     // passing off control to glut and before fgInitGeneral to get our
1522     // fonts !!!
1523     guiInit();
1524
1525 #ifdef GL_EXT_texture_lod_bias
1526     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1527 #endif
1528
1529     // Set position relative to glide slope if requested
1530     fgSetPosFromGlideSlope();
1531
1532     // If we have an explicit, in-range lon/lat, use it.
1533     // If not, check for an airport-id and use that.
1534     // If not, default to the middle of the KSFO field.
1535     // The default values for lon/lat are deliberately out of range
1536     // so that the airport-id can take effect; valid lon/lat will
1537     // override airport-id, however.
1538     double lon_deg = fgGetDouble("/position/longitude-deg");
1539     double lat_deg = fgGetDouble("/position/latitude-deg");
1540     if (lon_deg < -180 || lon_deg > 180 || lat_deg < -90 || lat_deg > 90) {
1541       if ( fgGetString("/sim/startup/airport-id")[0] != '\0' ) {
1542         fgSetPosFromAirportIDandHdg( fgGetString("/sim/startup/airport-id"),
1543                                      fgGetDouble("/orientation/heading-deg") );
1544         // set tower position (a little off the heading for single
1545         // runway airports)
1546         fgSetTowerPosFromAirportID( fgGetString("/sim/startup/airport-id"),
1547                                     fgGetDouble("orientation/heading") );
1548       } else {
1549                                 // Default to middle of KSFO field
1550         fgSetDouble("/position/longitude-deg", -122.374843);
1551         fgSetDouble("/position/latitude-deg", 37.619002);
1552       }
1553     }
1554
1555     SGTime *t = fgInitTime();
1556     globals->set_time_params( t );
1557
1558     // Do some quick general initializations
1559     if( !fgInitGeneral()) {
1560         SG_LOG( SG_GENERAL, SG_ALERT,
1561                 "General initializations failed ..." );
1562         exit(-1);
1563     }
1564
1565     SGPath modelpath( globals->get_fg_root() );
1566     ssgModelPath( (char *)modelpath.c_str() );
1567
1568     // Initialize the global scenery manager
1569     globals->set_scenery( new FGScenery );
1570     globals->get_scenery()->init();
1571     globals->get_scenery()->bind();
1572
1573     ////////////////////////////////////////////////////////////////////
1574     // Initialize the general model subsystem.
1575     ////////////////////////////////////////////////////////////////////
1576
1577     globals->set_model_loader(new FGModelLoader);
1578     globals->set_texture_loader(new FGTextureLoader);
1579     globals->set_model_mgr(new FGModelMgr);
1580     globals->get_model_mgr()->init();
1581     globals->get_model_mgr()->bind();
1582
1583     ////////////////////////////////////////////////////////////////////
1584     // Initialize the 3D aircraft model subsystem.
1585     ////////////////////////////////////////////////////////////////////
1586
1587     globals->set_aircraft_model(new FGAircraftModel);
1588     globals->get_aircraft_model()->init();
1589     globals->get_aircraft_model()->bind();
1590
1591     ////////////////////////////////////////////////////////////////////
1592     // Initialize the view manager subsystem.
1593     ////////////////////////////////////////////////////////////////////
1594
1595     FGViewMgr *viewmgr = new FGViewMgr;
1596     globals->set_viewmgr( viewmgr );
1597     viewmgr->init();
1598     viewmgr->bind();
1599
1600
1601     // Initialize the sky
1602     SGPath ephem_data_path( globals->get_fg_root() );
1603     ephem_data_path.append( "Astro" );
1604     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1605     ephem->update( globals->get_time_params()->getMjd(),
1606                    globals->get_time_params()->getLst(),
1607                    0.0 );
1608     globals->set_ephem( ephem );
1609
1610                                 // TODO: move to environment mgr
1611     thesky = new SGSky;
1612     SGPath texture_path(globals->get_fg_root());
1613     texture_path.append("Textures");
1614     texture_path.append("Sky");
1615     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1616       SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1617       thesky->add_cloud_layer(layer);
1618     }
1619
1620
1621     SGPath sky_tex_path( globals->get_fg_root() );
1622     sky_tex_path.append( "Textures" );
1623     sky_tex_path.append( "Sky" );
1624     thesky->texture_path( sky_tex_path.str() );
1625
1626     thesky->build( 550.0, 550.0,
1627                    globals->get_ephem()->getNumPlanets(),
1628                    globals->get_ephem()->getPlanets(), 60000.0,
1629                    globals->get_ephem()->getNumStars(),
1630                    globals->get_ephem()->getStars(), 60000.0 );
1631
1632     // Initialize MagVar model
1633     SGMagVar *magvar = new SGMagVar();
1634     globals->set_mag( magvar );
1635
1636     // airport = new ssgBranch;
1637     // airport->setName( "Airport Lighting" );
1638     // lighting->addKid( airport );
1639
1640     // ADA
1641     fgLoadDCS();
1642     // ADA
1643
1644 #ifdef FG_NETWORK_OLK
1645     // Do the network intialization
1646     if ( fgGetBool("/sim/networking/network-olk") ) {
1647         printf("Multipilot mode %s\n",
1648                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1649     }
1650 #endif
1651
1652     // build our custom render states
1653     fgBuildRenderStates();
1654
1655     // pass control off to the master GLUT event handler
1656     glutMainLoop();
1657
1658     // we never actually get here ... but to avoid compiler warnings,
1659     // etc.
1660     return 0;
1661 }
1662
1663
1664 // $$$ end - added VS Renganathan, 15 Oct 2K
1665 //         - added Venky         , 12 Nov 2K
1666
1667 #if defined(__linux__) && defined(__i386__)
1668
1669 static void handleFPE (int);
1670
1671 static void
1672 initFPE ()
1673 {
1674     fpu_control_t fpe_flags = 0;
1675     _FPU_GETCW(fpe_flags);
1676 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1677 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1678 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1679 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1680 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1681 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1682     _FPU_SETCW(fpe_flags);
1683     signal(SIGFPE, handleFPE);
1684 }
1685
1686 static void
1687 handleFPE (int num)
1688 {
1689   initFPE();
1690   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1691 }
1692 #endif
1693
1694 #ifdef __APPLE__
1695
1696 typedef struct
1697 {
1698   int  lo;
1699   int  hi;
1700 } PSN;
1701
1702 extern "C" {
1703   short CPSGetCurrentProcess(PSN *psn);
1704   short CPSSetProcessName (PSN *psn, char *processname);
1705   short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
1706   short CPSSetFrontProcess(PSN *psn);
1707 };
1708
1709 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
1710
1711 #endif
1712
1713 // Main entry point; catch any exceptions that have made it this far.
1714 int main ( int argc, char **argv ) {
1715
1716     // Enable floating-point exceptions for Linux/x86
1717 #if defined(__linux__) && defined(__i386__)
1718     initFPE();
1719 #endif
1720
1721     // Enable floating-point exceptions for Windows
1722 #if defined( _MSC_VER ) && defined( DEBUG )
1723     // Christian, we should document what this does
1724     _control87( _EM_INEXACT, _MCW_EM );
1725 #endif
1726
1727 #if defined( HAVE_BC5PLUS )
1728     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1729 #endif
1730
1731     // Keyboard focus hack
1732 #ifdef __APPLE__
1733     {
1734       PSN psn;
1735
1736       glutInit (&argc, argv);
1737
1738       CPSGetCurrentProcess(&psn);
1739       CPSSetProcessName(&psn, "FlightGear");
1740       CPSEnableFG(&psn);
1741       CPSSetFrontProcess(&psn);
1742     }
1743 #endif
1744
1745     // FIXME: add other, more specific
1746     // exceptions.
1747     try {
1748         mainLoop(argc, argv);
1749     } catch (sg_throwable &t) {
1750                                 // We must use cerr rather than
1751                                 // logging, since logging may be
1752                                 // disabled.
1753         cerr << "Fatal error: " << t.getFormattedMessage()
1754              << "\n (received from " << t.getOrigin() << ')' << endl;
1755         exit(1);
1756     }
1757
1758     return 0;
1759 }
1760
1761
1762 void fgLoadDCS(void) {
1763
1764     ssgEntity *ship_obj = NULL;
1765
1766     char obj_filename[25];
1767
1768     for ( int k = 0; k < 32; k++ ) {
1769         ship_pos[k]=NULL;
1770     }
1771
1772     SGPath tile_path( globals->get_fg_root());
1773     tile_path.append( "Scenery" );
1774     tile_path.append( "Objects.txt" );
1775     sg_gzifstream in( tile_path.str() );
1776     if ( ! in.is_open() ) {
1777         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1778     } else {
1779
1780         SGPath modelpath( globals->get_fg_root() );
1781         modelpath.append( "Models" );
1782         modelpath.append( "Geometry" );
1783
1784         SGPath texturepath( globals->get_fg_root() );
1785         texturepath.append( "Models" );
1786         texturepath.append( "Textures" );
1787
1788         ssgModelPath( (char *)modelpath.c_str() );
1789         ssgTexturePath( (char *)texturepath.c_str() );
1790
1791         ship_sel = new ssgSelector;
1792
1793         char c;
1794         while ( ! in.eof() ) {
1795             in >> ::skipws;
1796             if ( in.get( c ) && c == '#' ) {
1797                 in >> skipeol;
1798             } else {
1799                 in.putback(c);
1800                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1801                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1802                    int chj=getchar();*/
1803
1804                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1805                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1806
1807                 ship_pos[objc] = new ssgTransform;
1808
1809                 // type "repeat" in objects.txt to load one more
1810                 // instance of the last object.
1811
1812                 if ( strcmp(obj_filename,"repeat") != 0) {
1813                     ship_obj =
1814                         globals->get_model_loader()->load_model( obj_filename );
1815                 }
1816
1817                 if ( ship_obj != NULL ) {
1818                                         ship_obj->setName(obj_filename);
1819                                 if (objc == 0)
1820                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1821                                         else
1822                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1823                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1824                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1825                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1826                             << obj_filename );
1827                 } else {
1828                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1829                             << obj_filename );
1830                 }
1831
1832                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1833                                 //const char *extn = file_extension ( obj_filename ) ;
1834                                 if ( objc == 1 ){
1835                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1836                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1837                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1838                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1839                                         int ltype[500], light_type;
1840                                         static int ltcount = 0;
1841                                     string token;
1842                                         sgVec3 rway_dir,rway_normal,lightpt;
1843                                         Point3D node;
1844                                         modelpath.append(obj_filename);
1845                                         sg_gzifstream in1( modelpath.str() );
1846                                         if ( ! in1.is_open() ) {
1847                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1848                                         } else {
1849                                                 while ( ! in1.eof() ) {
1850                                                         in1 >> ::skipws;
1851                                                         if ( in1.get( c ) && c == '#' ) {
1852                                                                 in1 >> skipeol;
1853                                                         } else {
1854                                                                 in1.putback(c);
1855                                                                 in1 >> token;
1856                                                                 //cout << token << endl;
1857                                                                 if ( token == "runway" ) {
1858                                                                         in1 >> node;
1859                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1860                                                                 } else if ( token == "edgelight" ) {
1861                                                                         in1 >> node;
1862                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1863                                                                         light_type = 1;
1864                                                                 } else if ( token == "taxi" ) {
1865                                                                         in1 >> node;
1866                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1867                                                                         light_type = 2;
1868                                                                 } else if ( token == "vasi" ) {
1869                                                                         in1 >> node;
1870                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1871                                                                         light_type = 3;
1872                                                                 } else if ( token == "threshold" ) {
1873                                                                         in1 >> node;
1874                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1875                                                                         light_type = 4;
1876                                                                 } else if ( token == "rabbit" ) {
1877                                                                         in1 >> node;
1878                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1879                                                                         light_type = 5;
1880                                                                 } else if ( token == "ols" ) {
1881                                                                         in1 >> node;
1882                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1883                                                                         light_type = 6;
1884                                                                 } else if ( token == "red" ) {
1885                                                                         in1 >> node;
1886                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1887                                                                         light_type = 7;
1888                                                                 } else if ( token == "green" ) {
1889                                                                         in1 >> node;
1890                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1891                                                                         light_type = 8;
1892                                                                 } else if ( token == "lp" ) {
1893                                                                         in1 >> node;
1894                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1895                                                                         lightpoints->add( lightpt );
1896                                                                         lightnormals->add( rway_normal );
1897                                                                         lightdir->add( rway_dir );
1898                                                                         ltype[ltcount]= light_type;
1899                                                                         ltcount++;
1900                                                                 }
1901                                                                 if (in1.eof()) break;
1902                                                         }
1903                                                 }  //while
1904
1905                                                 if ( lightpoints->getNum() ) {
1906                                                         ssgBranch *lightpoints_branch;
1907                                                         long int dummy = -999;
1908                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1909                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1910                                                         dummy_tile->ols_transform = new ssgTransform;
1911
1912                                                         // call function to generate the runway lights
1913                                                         lightpoints_branch =
1914                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1915                                                                                                                                 lightdir, ltype);
1916                                                         lightpoints_brightness->addKid(lightpoints_branch);
1917                                                         lightpoints_transform->addKid(lightpoints_brightness);
1918                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1919                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1920                                                         lightpoints_transform->ref();
1921                                                         globals->get_scenery()->get_gnd_lights_branch()->addKid( lightpoints_transform );
1922                                                 }
1923                                         } //if in1
1924                 } //if objc
1925                                 // end hack for deck lights
1926
1927                 objc++;
1928
1929                 if (in.eof()) break;
1930             }
1931         } // while
1932
1933         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
1934
1935         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
1936     }
1937
1938     return;
1939  }
1940
1941
1942 void fgUpdateDCS (void) {
1943
1944     // double eye_lat,eye_lon,eye_alt;
1945     // static double obj_head;
1946     double sl_radius,obj_latgc;
1947     // float nresultmat[4][4];
1948     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
1949     double bz[3];
1950
1951     // Instantaneous Geodetic Lat/Lon/Alt of moving object
1952     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
1953
1954     // Deck should be the first object in objects.txt in case of fdm=ada
1955
1956     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
1957                 if ((fdm->get_iaux(1))==1)
1958                 {
1959                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
1960                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
1961                         obj_alt[1] = fdm->get_daux(3);
1962                         obj_pitch[1] = fdm->get_faux(1);
1963                         obj_roll[1] = fdm->get_faux(2);
1964                 }
1965     }
1966
1967     for ( int m = 0; m < objc; m++ ) {
1968         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
1969         //int v=getchar();
1970
1971         //Geodetic to Geocentric angles for rotation
1972         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
1973
1974         //moving object gbs-posn in cartesian coords
1975         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
1976         Point3D obj_pos = sgGeodToCart( obj_posn );
1977
1978         // Translate moving object w.r.t eye
1979         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
1980         bz[0]=Objtrans.x();
1981         bz[1]=Objtrans.y();
1982         bz[2]=Objtrans.z();
1983
1984        // rotate dynamic objects for lat,lon & alt and other motion about its axes
1985
1986         sgMat4 sgTRANS;
1987         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
1988
1989         sgVec3 ship_fwd,ship_rt,ship_up;
1990         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
1991         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
1992         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
1993
1994         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
1995         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
1996         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
1997         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
1998         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
1999         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
2000
2001         sgMat4 sgTUX;
2002         sgCopyMat4( sgTUX, sgROT_hdg );
2003         sgPostMultMat4( sgTUX, sgROT_pitch );
2004         sgPostMultMat4( sgTUX, sgROT_roll );
2005         sgPostMultMat4( sgTUX, sgROT_lat );
2006         sgPostMultMat4( sgTUX, sgROT_lon );
2007         sgPostMultMat4( sgTUX, sgTRANS );
2008
2009         sgCoord shippos;
2010         sgSetCoord(&shippos, sgTUX );
2011         ship_pos[m]->setTransform( &shippos );
2012         // temporary hack for deck lights - ultimately should move to PLib (when ??)
2013         if (m == 1) {
2014                 if (lightpoints_transform) {
2015                         lightpoints_transform->setTransform( &shippos );
2016                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
2017                         if ( sun_angle > 89 ) {
2018                                 lightpoints_brightness->select(0x01);
2019                         } else {
2020                                 lightpoints_brightness->select(0x00);
2021                         }
2022                 }
2023
2024                 float elev;
2025                 sgVec3 rp,to;
2026                 float *vp;
2027                 float alt;
2028                 float ref_elev;
2029                 sgXformPnt3( rp, rway_ols, sgTUX );
2030                 vp = globals->get_current_view()->get_view_pos();
2031             to[0] = rp[0]-vp[0];
2032             to[1] = rp[1]-vp[1];
2033             to[2] = rp[2]-vp[2];
2034                 float dist = sgLengthVec3( to );
2035                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
2036
2037                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
2038
2039             ref_elev = elev - 3.75; // +ve above, -ve below
2040
2041                 unsigned int sel;
2042                 sel = 0xFF;
2043 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2044 //              if (ref_elev > 0.51) sel = 0x21;
2045 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
2046 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
2047 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
2048 //              if (ref_elev < -0.51) sel = 0x30;
2049 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2050                 dummy_tile->lightmaps_sequence->select(sel);
2051
2052                 sgVec3 up;
2053                 sgCopyVec3 (up, ship_up);
2054                 if (dist > 750)
2055                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
2056                 else
2057                         sgScaleVec3 (up, 4.0*ref_elev);
2058                 dummy_tile->ols_transform->setTransform(up);
2059                 //cout << "ref_elev  " << ref_elev << endl;
2060         }
2061     // end hack for deck lights
2062
2063     }
2064     if ( ship_sel != NULL ) {
2065         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2066     }
2067 }
2068
2069 // $$$ end - added VS Renganathan, 15 Oct 2K
2070 //           added Venky         , 12 Nov 2K