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