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/ssg.h>
  76
  77 #include <simgear/constants.h>  // for VERSION
  78 #include <simgear/debug/logstream.hxx>
  79 #include <simgear/math/polar3d.hxx>
  80 #include <simgear/math/sg_random.h>
  81 #include <simgear/misc/sg_path.hxx>
  82 #include <simgear/sky/sky.hxx>
  83 #include <simgear/timing/sg_time.hxx>
  84
  85 #include <Include/general.hxx>
  86
  87 #include <Aircraft/aircraft.hxx>
  88
  89 #include <ATC/ATCmgr.hxx>
  90 #include <ATC/ATCdisplay.hxx>
  91 #include <ATC/AIMgr.hxx>
  92
  93 #include <Autopilot/newauto.hxx>
  94
  95 #include <Cockpit/cockpit.hxx>
  96 #include <Cockpit/radiostack.hxx>
  97 #include <Cockpit/steam.hxx>
  98
  99 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 100 #include <GUI/gui.h>
 101 #include <Model/acmodel.hxx>
 102 #include <Model/modelmgr.hxx>
 103 #ifdef FG_NETWORK_OLK
 104 #include <NetworkOLK/network.h>
 105 #endif
 106 #include <Objects/matlib.hxx>
 107 #include <Scenery/scenery.hxx>
 108 #include <Scenery/tilemgr.hxx>
 109 #ifdef ENABLE_AUDIO_SUPPORT
 110 #  include <Sound/soundmgr.hxx>
 111 #  include <Sound/fg_fx.hxx>
 112 #  include <Sound/morse.hxx>
 113 #endif
 114 #include <Time/FGEventMgr.hxx>
 115 #include <Time/fg_timer.hxx>
 116 #include <Time/light.hxx>
 117 #include <Time/sunpos.hxx>
 118 #include <Time/tmp.hxx>
 119
 120 #include <Input/input.hxx>
 121
 122 // ADA
 123 #include <simgear/misc/sgstream.hxx>
 124 #include <simgear/math/point3d.hxx>
 125 #include <FDM/flight.hxx>
 126 #include <FDM/ADA.hxx>
 127 #include <Scenery/tileentry.hxx>
 128
 129 #if !defined(sgi)
 130 // PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 131 // PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 132 #endif
 133 float default_attenuation[3] = {1.0, 0.0, 0.0};
 134 //Required for using GL_extensions
 135 void fgLoadDCS (void);
 136 void fgUpdateDCS (void);
 137 ssgSelector *ship_sel=NULL;
 138 // upto 32 instances of a same object can be loaded.
 139 ssgTransform *ship_pos[32];
 140 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 141 int objc=0;
 142 ssgSelector *lightpoints_brightness = new ssgSelector;
 143 ssgTransform *lightpoints_transform = new ssgTransform;
 144 FGTileEntry *dummy_tile;
 145 sgVec3 rway_ols;
 146 // ADA
 147 // Clip plane settings...
 148 float scene_nearplane = 0.5f;
 149 float scene_farplane = 120000.0f;
 150
 151
 152 #ifndef FG_NEW_ENVIRONMENT
 153 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 154 #else
 155 #  include <Environment/environment_mgr.hxx>
 156 #endif
 157
 158 #include "version.h"
 159
 160 #include "fg_init.hxx"
 161 #include "fg_io.hxx"
 162 #include "fg_props.hxx"
 163 #include "globals.hxx"
 164 #include "splash.hxx"
 165 #include "viewmgr.hxx"
 166 #include "options.hxx"
 167 #include "logger.hxx"
 168
 169 #ifdef macintosh
 170 #  include <console.h>          // -dw- for command line dialog
 171 #endif
 172
 173
 174 FGEventMgr global_events;
 175
 176 // This is a record containing a bit of global housekeeping information
 177 FGGeneral general;
 178
 179 // Specify our current idle function state.  This is used to run all
 180 // our initializations out of the glutIdleLoop() so that we can get a
 181 // splash screen up and running right away.
 182 static int idle_state = 0;
 183 static long global_multi_loop;
 184
 185 // forward declaration
 186 void fgReshape( int width, int height );
 187
 188 // fog constants.  I'm a little nervous about putting actual code out
 189 // here but it seems to work (?)
 190 static const double m_log01 = -log( 0.01 );
 191 static const double sqrt_m_log01 = sqrt( m_log01 );
 192 static GLfloat fog_exp_density;
 193 static GLfloat fog_exp2_density;
 194 static GLfloat fog_exp2_punch_through;
 195
 196 ssgRoot *lighting = NULL;
 197 // ssgBranch *airport = NULL;
 198
 199 #ifdef FG_NETWORK_OLK
 200 ssgSelector *fgd_sel = NULL;
 201 ssgTransform *fgd_pos = NULL;
 202 #endif
 203
 204 // current fdm/position used for view
 205 FGInterface cur_view_fdm;
 206
 207 // Sky structures
 208 SGSky *thesky;
 209
 210 // hack
 211 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 212 {
 213   {  1.0f,  0.0f,  0.0f,  0.0f },
 214   {  0.0f,  0.0f, -1.0f,  0.0f },
 215   {  0.0f,  1.0f,  0.0f,  0.0f },
 216   {  0.0f,  0.0f,  0.0f,  1.0f }
 217 };
 218
 219 // The following defines flightgear options. Because glutlib will also
 220 // want to parse its own options, those options must not be included here
 221 // or they will get parsed by the main program option parser. Hence case
 222 // is significant for any option added that might be in conflict with
 223 // glutlib's parser.
 224 //
 225 // glutlib parses for:
 226 //    -display
 227 //    -direct   (invalid in Win32)
 228 //    -geometry
 229 //    -gldebug
 230 //    -iconized
 231 //    -indirect (invalid in Win32)
 232 //    -synce
 233 //
 234 // Note that glutlib depends upon strings while this program's
 235 // option parser wants only initial characters followed by numbers
 236 // or pathnames.
 237 //
 238
 239
 240 ssgSimpleState *default_state;
 241 ssgSimpleState *hud_and_panel;
 242 ssgSimpleState *menus;
 243
 244 SGTimeStamp last_time_stamp;
 245 SGTimeStamp current_time_stamp;
 246
 247 void fgBuildRenderStates( void ) {
 248     default_state = new ssgSimpleState;
 249     default_state->ref();
 250     default_state->disable( GL_TEXTURE_2D );
 251     default_state->enable( GL_CULL_FACE );
 252     default_state->enable( GL_COLOR_MATERIAL );
 253     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 254     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 255     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 256     default_state->disable( GL_BLEND );
 257     default_state->disable( GL_ALPHA_TEST );
 258     default_state->disable( GL_LIGHTING );
 259
 260     hud_and_panel = new ssgSimpleState;
 261     hud_and_panel->ref();
 262     hud_and_panel->disable( GL_CULL_FACE );
 263     hud_and_panel->disable( GL_TEXTURE_2D );
 264     hud_and_panel->disable( GL_LIGHTING );
 265     hud_and_panel->enable( GL_BLEND );
 266
 267     menus = new ssgSimpleState;
 268     menus->ref();
 269     menus->disable( GL_CULL_FACE );
 270     menus->disable( GL_TEXTURE_2D );
 271     menus->enable( GL_BLEND );
 272 }
 273
 274
 275 // fgInitVisuals() -- Initialize various GL/view parameters
 276 void fgInitVisuals( void ) {
 277     fgLIGHT *l;
 278
 279     l = &cur_light_params;
 280
 281 #ifndef GLUT_WRONG_VERSION
 282     // Go full screen if requested ...
 283     if ( fgGetBool("/sim/startup/fullscreen") ) {
 284         glutFullScreen();
 285     }
 286 #endif
 287
 288     // If enabled, normal vectors specified with glNormal are scaled
 289     // to unit length after transformation.  Enabling this has
 290     // performance implications.  See the docs for glNormal.
 291     // glEnable( GL_NORMALIZE );
 292
 293     glEnable( GL_LIGHTING );
 294     glEnable( GL_LIGHT0 );
 295     glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 296
 297     sgVec3 sunpos;
 298     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 299     ssgGetLight( 0 ) -> setPosition( sunpos );
 300
 301     glFogi (GL_FOG_MODE, GL_EXP2);
 302     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 303          (!fgGetBool("/sim/rendering/shading"))) {
 304         // if fastest fog requested, or if flat shading force fastest
 305         glHint ( GL_FOG_HINT, GL_FASTEST );
 306     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 307         glHint ( GL_FOG_HINT, GL_NICEST );
 308     }
 309     if ( fgGetBool("/sim/rendering/wireframe") ) {
 310         // draw wire frame
 311         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 312     }
 313
 314     // This is the default anyways, but it can't hurt
 315     glFrontFace ( GL_CCW );
 316
 317     // Just testing ...
 318     // glEnable(GL_POINT_SMOOTH);
 319     // glEnable(GL_LINE_SMOOTH);
 320     // glEnable(GL_POLYGON_SMOOTH);
 321 }
 322
 323
 324 // For HiRes screen Dumps using Brian Pauls TR Library
 325 void trRenderFrame( void ) {
 326
 327     if ( fgPanelVisible() ) {
 328         GLfloat height = fgGetInt("/sim/startup/ysize");
 329         GLfloat view_h =
 330             (current_panel->getViewHeight() - current_panel->getYOffset())
 331             * (height / 768.0) + 1;
 332         glTranslatef( 0.0, view_h, 0.0 );
 333     }
 334
 335     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 336     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 337
 338     fgLIGHT *l = &cur_light_params;
 339
 340     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 341                  l->adj_fog_color[2], l->adj_fog_color[3]);
 342
 343     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 344
 345     // set the opengl state to known default values
 346     default_state->force();
 347
 348     glEnable( GL_FOG );
 349     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 350     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 351     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 352
 353     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 354     // we only update GL_AMBIENT for our lights we will never get
 355     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 356     // explicitely to black.
 357     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 358
 359     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 360
 361     // texture parameters
 362     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 363     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 364
 365     // we need a white diffuse light for the phase of the moon
 366     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 367     thesky->preDraw();
 368
 369     // draw the ssg scene
 370     // return to the desired diffuse color
 371     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 372     glEnable( GL_DEPTH_TEST );
 373     ssgSetNearFar( scene_nearplane, scene_farplane );
 374     ssgCullAndDraw( globals->get_scene_graph() );
 375
 376     // draw the lights
 377     glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 378     ssgSetNearFar( scene_nearplane, scene_farplane );
 379     ssgCullAndDraw( lighting );
 380
 381     thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 382
 383     globals->get_model_mgr()->draw();
 384     globals->get_aircraft_model()->draw();
 385
 386     // need to do this here as hud_and_panel state is static to
 387     // main.cxx  and HUD and Panel routines have to be called with
 388     // knowledge of the the TR struct < see gui.cxx::HighResDump()
 389     hud_and_panel->apply();
 390 }
 391
 392
 393 // Update all Visuals (redraws anything graphics related)
 394 void fgRenderFrame( void ) {
 395
 396     // Update the elapsed time.
 397     current_time_stamp.stamp();
 398     int dt_ms = (current_time_stamp - last_time_stamp) / 1000L;
 399     globals->inc_sim_time_ms( dt_ms );
 400     last_time_stamp = current_time_stamp;
 401
 402     // Process/manage pending events
 403     global_events.update( dt_ms );
 404
 405     static const SGPropertyNode *longitude
 406         = fgGetNode("/position/longitude-deg");
 407     static const SGPropertyNode *latitude
 408         = fgGetNode("/position/latitude-deg");
 409     static const SGPropertyNode *altitude
 410         = fgGetNode("/position/altitude-ft");
 411     static const SGPropertyNode *groundlevel_nearplane
 412         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 413
 414     // Update the default (kludged) properties.
 415     fgUpdateProps();
 416
 417     FGViewer *current__view = globals->get_current_view();
 418
 419     fgLIGHT *l = &cur_light_params;
 420     static double last_visibility = -9999;
 421
 422     // update fog params
 423     double actual_visibility       = thesky->get_visibility();
 424     if ( actual_visibility != last_visibility ) {
 425         last_visibility = actual_visibility;
 426
 427         fog_exp_density = m_log01 / actual_visibility;
 428         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 429         fog_exp2_punch_through = sqrt_m_log01 / ( actual_visibility * 2.5 );
 430     }
 431
 432     // double angle;
 433     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 434     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 435     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 436     // GLfloat mat_shininess[] = { 10.0 };
 437     GLbitfield clear_mask;
 438
 439     if ( idle_state != 1000 ) {
 440         // still initializing, draw the splash screen
 441         if ( fgGetBool("/sim/startup/splash-screen") ) {
 442             fgSplashUpdate(0.0);
 443         }
 444         // Keep resetting sim time while the sim is initializing
 445         globals->set_sim_time_ms( 0.0 );
 446     } else {
 447         // idle_state is now 1000 meaning we've finished all our
 448         // initializations and are running the main loop, so this will
 449         // now work without seg faulting the system.
 450
 451         // calculate our current position in cartesian space
 452         scenery.set_center( scenery.get_next_center() );
 453
 454         // update view port
 455         fgReshape( fgGetInt("/sim/startup/xsize"),
 456                    fgGetInt("/sim/startup/ysize") );
 457
 458         // set the sun position
 459         glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 460
 461         clear_mask = GL_DEPTH_BUFFER_BIT;
 462         if ( fgGetBool("/sim/rendering/wireframe") ) {
 463             clear_mask |= GL_COLOR_BUFFER_BIT;
 464         }
 465
 466         if ( fgGetBool("/sim/rendering/skyblend") ) {
 467             if ( fgGetBool("/sim/rendering/textures") ) {
 468                 // glClearColor(black[0], black[1], black[2], black[3]);
 469                 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 470                              l->adj_fog_color[2], l->adj_fog_color[3]);
 471                 clear_mask |= GL_COLOR_BUFFER_BIT;
 472             }
 473         } else {
 474             glClearColor(l->sky_color[0], l->sky_color[1],
 475                          l->sky_color[2], l->sky_color[3]);
 476             clear_mask |= GL_COLOR_BUFFER_BIT;
 477         }
 478         glClear( clear_mask );
 479
 480         // Tell GL we are switching to model view parameters
 481
 482         // I really should create a derived ssg node or use a call
 483         // back or something so that I can draw the sky within the
 484         // ssgCullAndDraw() function, but for now I just mimic what
 485         // ssg does to set up the model view matrix
 486         glMatrixMode(GL_MODELVIEW);
 487         glLoadIdentity();
 488         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 489
 490         // set the opengl state to known default values
 491         default_state->force();
 492
 493         // update fog params if visibility has changed
 494         double visibility_meters = fgGetDouble("/environment/visibility-m");
 495         thesky->set_visibility(visibility_meters);
 496
 497         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 498                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 499                             / (double)fgGetInt("/sim/model-hz") );
 500
 501         // Set correct opengl fog density
 502         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 503
 504         // update the sky dome
 505         if ( fgGetBool("/sim/rendering/skyblend") ) {
 506             /* cout << "thesky->repaint() sky_color = "
 507                  << cur_light_params.sky_color[0] << " "
 508                  << cur_light_params.sky_color[1] << " "
 509                  << cur_light_params.sky_color[2] << " "
 510                  << cur_light_params.sky_color[3] << endl;
 511             cout << "    fog = "
 512                  << cur_light_params.fog_color[0] << " "
 513                  << cur_light_params.fog_color[1] << " "
 514                  << cur_light_params.fog_color[2] << " "
 515                  << cur_light_params.fog_color[3] << endl;
 516             cout << "    sun_angle = " << cur_light_params.sun_angle
 517                  << "    moon_angle = " << cur_light_params.moon_angle
 518                  << endl; */
 519             thesky->repaint( cur_light_params.sky_color,
 520                              cur_light_params.adj_fog_color,
 521                              cur_light_params.sun_angle,
 522                              cur_light_params.moon_angle,
 523                              globals->get_ephem()->getNumPlanets(),
 524                              globals->get_ephem()->getPlanets(),
 525                              globals->get_ephem()->getNumStars(),
 526                              globals->get_ephem()->getStars() );
 527
 528             /* cout << "thesky->reposition( view_pos = " << view_pos[0] << " "
 529                  << view_pos[1] << " " << view_pos[2] << endl;
 530             cout << "    zero_elev = " << zero_elev[0] << " "
 531                  << zero_elev[1] << " " << zero_elev[2]
 532                  << " lon = " << cur_fdm_state->get_Longitude()
 533                  << " lat = " << cur_fdm_state->get_Latitude() << endl;
 534             cout << "    sun_rot = " << cur_light_params.sun_rotation
 535                  << " gst = " << SGTime::cur_time_params->getGst() << endl;
 536             cout << "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 537                  << " sun dec = " << globals->get_ephem()->getSunDeclination()
 538                  << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 539                  << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 540
 541             thesky->reposition( current__view->get_view_pos(),
 542                                 current__view->get_zero_elev(),
 543                                 current__view->get_world_up(),
 544                                 longitude->getDoubleValue()
 545                                   * SGD_DEGREES_TO_RADIANS,
 546                                 latitude->getDoubleValue()
 547                                   * SGD_DEGREES_TO_RADIANS,
 548                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
 549                                 cur_light_params.sun_rotation,
 550                                 globals->get_time_params()->getGst(),
 551                                 globals->get_ephem()->getSunRightAscension(),
 552                                 globals->get_ephem()->getSunDeclination(),
 553                                 50000.0,
 554                                 globals->get_ephem()->getMoonRightAscension(),
 555                                 globals->get_ephem()->getMoonDeclination(),
 556                                 50000.0 );
 557         }
 558
 559         glEnable( GL_DEPTH_TEST );
 560         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 561             glEnable( GL_FOG );
 562             glFogi( GL_FOG_MODE, GL_EXP2 );
 563             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 564         }
 565
 566         // set sun/lighting parameters
 567         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 568
 569         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 570         // we only update GL_AMBIENT for our lights we will never get
 571         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 572         // explicitely to black.
 573         GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 574         GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 575         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 576
 577         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 578         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 579         // ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_white );
 580
 581         // texture parameters
 582         // glEnable( GL_TEXTURE_2D );
 583         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 584         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 585
 586         // glMatrixMode( GL_PROJECTION );
 587         // glLoadIdentity();
 588         ssgSetFOV( current__view->get_h_fov(),
 589                    current__view->get_v_fov() );
 590
 591         double agl = current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 592             - 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         global_tile_mgr.prep_ssg_nodes(visibility_meters);
 632
 633         if ( fgGetBool("/sim/rendering/skyblend") ) {
 634             // draw the sky backdrop
 635
 636             // we need a white diffuse light for the phase of the moon
 637             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 638
 639             thesky->preDraw();
 640
 641             // return to the desired diffuse color
 642             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 643         }
 644
 645         // draw the ssg scene
 646         glEnable( GL_DEPTH_TEST );
 647
 648         ssgSetNearFar( scene_nearplane, scene_farplane );
 649         ssgCullAndDraw( globals->get_scene_graph() );
 650
 651         // change state for lighting here
 652
 653         // draw lighting
 654         // Set punch through fog density
 655         glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 656
 657 #ifdef FG_EXPERIMENTAL_LIGHTING
 658         // Enable states for drawing points with GL_extension
 659         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 660             glEnable(GL_POINT_SMOOTH);
 661             float quadratic[3] = {1.0, 0.01, 0.0001};
 662             // get the address of our OpenGL extensions
 663 #if !defined(sgi)
 664             glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
 665                 wglGetProcAddress("glPointParameterfEXT");
 666             glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
 667                 wglGetProcAddress("glPointParameterfvEXT");
 668 #endif
 669             // makes the points fade as they move away
 670             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 671             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 672             glPointSize(4.0);
 673
 674             // Enable states for drawing runway lights with spherical mapping
 675             glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 676             glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 677             glEnable(GL_TEXTURE_GEN_S);
 678             glEnable(GL_TEXTURE_GEN_T);
 679
 680             //Maybe this is not the best way, but it works !!
 681             glPolygonMode(GL_FRONT, GL_POINT);
 682             glCullFace(GL_BACK);
 683             glEnable(GL_CULL_FACE);
 684         }
 685
 686         glDisable( GL_LIGHTING );
 687         // blending function for runway lights
 688         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 689         glEnable(GL_BLEND);
 690 #endif
 691
 692         ssgSetNearFar( scene_nearplane, scene_farplane );
 693         ssgCullAndDraw( lighting );
 694
 695
 696 #ifdef FG_EXPERIMENTAL_LIGHTING
 697         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 698             // Disable states used for runway lighting
 699             glPolygonMode(GL_FRONT, GL_FILL);
 700
 701             glDisable(GL_TEXTURE_GEN_S);
 702             glDisable(GL_TEXTURE_GEN_T);
 703             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 704                                   default_attenuation);
 705         }
 706
 707         glPointSize(1.0);
 708 #endif
 709
 710         if ( fgGetBool("/sim/rendering/skyblend") ) {
 711             // draw the sky cloud layers
 712             thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 713         }
 714
 715         globals->get_model_mgr()->draw();
 716         globals->get_aircraft_model()->draw();
 717
 718         // display HUD && Panel
 719         glDisable( GL_FOG );
 720         glDisable( GL_DEPTH_TEST );
 721         // glDisable( GL_CULL_FACE );
 722         // glDisable( GL_TEXTURE_2D );
 723
 724         // update the input subsystem
 725         current_input.update(dt_ms);
 726
 727         // update the controls subsystem
 728         globals->get_controls()->update(dt_ms);
 729
 730         hud_and_panel->apply();
 731         fgCockpitUpdate();
 732
 733         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 734         // This only works properly if called before the panel call
 735         globals->get_ATC_display()->update(dt_ms);
 736
 737         // update the panel subsystem
 738         if ( current_panel != NULL ) {
 739             current_panel->update(dt_ms);
 740         }
 741
 742         // We can do translucent menus, so why not. :-)
 743         menus->apply();
 744         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 745         puDisplay();
 746         // glDisable ( GL_BLEND ) ;
 747
 748         // glEnable( GL_FOG );
 749
 750         globals->get_logger()->update(dt_ms);
 751     }
 752
 753     glutSwapBuffers();
 754 }
 755
 756
 757 // Update internal time dependent calculations (i.e. flight model)
 758 void fgUpdateTimeDepCalcs() {
 759     static bool inited = false;
 760     static const SGPropertyNode *master_freeze
 761         = fgGetNode("/sim/freeze/master");
 762
 763     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 764
 765     fgLIGHT *l = &cur_light_params;
 766     int i;
 767
 768     long multi_loop = 1;
 769
 770     // Initialize the FDM here if it hasn't been and if we have a
 771     // scenery elevation hit.
 772
 773     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 774     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 775
 776     if ( !cur_fdm_state->get_inited() && scenery.get_cur_elev() > -9990 ) {
 777         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 778
 779         cur_fdm_state->init();
 780         if ( cur_fdm_state->get_bound() ) {
 781             cur_fdm_state->unbind();
 782         }
 783         cur_fdm_state->bind();
 784     }
 785
 786     // conceptually, the following block could be done for each fdm
 787     // instance ...
 788     if ( !cur_fdm_state->get_inited() ) {
 789         // do nothing, fdm isn't inited yet
 790     } else if ( master_freeze->getBoolValue() ) {
 791         // we are frozen, run the fdm's with 0 time slices in case
 792         // they want to do something with that.
 793
 794         cur_fdm_state->update( 0 );
 795         FGSteam::update( 0 );
 796     } else {
 797         // we have been inited, and we are not frozen, we are good to go ...
 798
 799         if ( !inited ) {
 800             cur_fdm_state->stamp();
 801             inited = true;
 802         }
 803
 804         SGTimeStamp current;
 805         current.stamp();
 806         long elapsed = current - cur_fdm_state->get_time_stamp();
 807         cur_fdm_state->set_time_stamp( current );
 808         elapsed += cur_fdm_state->get_remainder();
 809         // cout << "elapsed = " << elapsed << endl;
 810         // cout << "dt = " << cur_fdm_state->get_delta_t() << endl;
 811         multi_loop = (long)(((double)elapsed * 0.000001) /
 812                                cur_fdm_state->get_delta_t() );
 813         cur_fdm_state->set_multi_loop( multi_loop );
 814         long remainder = elapsed - (long)( (multi_loop*1000000) *
 815                                      cur_fdm_state->get_delta_t() );
 816         cur_fdm_state->set_remainder( remainder );
 817         // cout << "remainder = " << remainder << endl;
 818
 819         // chop max interations to something reasonable if the sim was
 820         // delayed for an excesive amount of time
 821         if ( multi_loop > 2.0 / cur_fdm_state->get_delta_t() ) {
 822             multi_loop = (int)(2.0 / cur_fdm_state->get_delta_t());
 823             cur_fdm_state->set_remainder( 0 );
 824         }
 825
 826         // cout << "multi_loop = " << multi_loop << endl;
 827         for ( i = 0; i < multi_loop * fgGetInt("/sim/speed-up"); ++i ) {
 828             // run Autopilot system
 829             globals->get_autopilot()->update(0); // FIXME: use real dt
 830
 831             // update FDM
 832             cur_fdm_state->update( 1 );
 833         }
 834         FGSteam::update( multi_loop * fgGetInt("/sim/speed-up") );
 835     }
 836
 837     if ( !strcmp(fgGetString("/sim/view-mode"), "pilot") ) {
 838         cur_view_fdm = *cur_fdm_state;
 839         // do nothing
 840     }
 841
 842
 843     globals->get_model_mgr()->update(multi_loop);
 844     globals->get_aircraft_model()->update(multi_loop);
 845
 846     // update the view angle
 847     globals->get_viewmgr()->update(multi_loop);
 848
 849     l->UpdateAdjFog();
 850
 851     // Update solar system
 852     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 853                                   globals->get_time_params()->getLst(),
 854                                   cur_fdm_state->get_Latitude() );
 855
 856     // Update radio stack model
 857     current_radiostack->update(multi_loop);
 858 }
 859
 860
 861 void fgInitTimeDepCalcs( void ) {
 862     // noop for now
 863 }
 864
 865
 866 static const double alt_adjust_ft = 3.758099;
 867 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 868
 869
 870 // What should we do when we have nothing else to do?  Let's get ready
 871 // for the next move and update the display?
 872 static void fgMainLoop( void ) {
 873     static const SGPropertyNode *longitude
 874         = fgGetNode("/position/longitude-deg");
 875     static const SGPropertyNode *latitude
 876         = fgGetNode("/position/latitude-deg");
 877     static const SGPropertyNode *altitude
 878         = fgGetNode("/position/altitude-ft");
 879     static const SGPropertyNode *clock_freeze
 880         = fgGetNode("/sim/freeze/clock", true);
 881     static const SGPropertyNode *cur_time_override
 882         = fgGetNode("/sim/time/cur-time-override", true);
 883
 884     static long remainder = 0;
 885     long elapsed;
 886 #ifdef FANCY_FRAME_COUNTER
 887     int i;
 888     double accum;
 889 #else
 890     static time_t last_time = 0;
 891     static int frames = 0;
 892 #endif // FANCY_FRAME_COUNTER
 893
 894     SGTime *t = globals->get_time_params();
 895
 896     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 897     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 898
 899 #ifdef FG_NETWORK_OLK
 900     if ( fgGetBool("/sim/networking/network-olk") ) {
 901         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
 902             // printf("FGD: Netupdate\n");
 903             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
 904             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
 905         }
 906     }
 907 #endif
 908
 909 #if defined( ENABLE_PLIB_JOYSTICK )
 910     // Read joystick and update control settings
 911     // if ( fgGetString("/sim/control-mode") == "joystick" )
 912     // {
 913     //    fgJoystickRead();
 914     // }
 915 #elif defined( ENABLE_GLUT_JOYSTICK )
 916     // Glut joystick support works by feeding a joystick handler
 917     // function to glut.  This is taken care of once in the joystick
 918     // init routine and we don't have to worry about it again.
 919 #endif
 920
 921 #ifdef FG_NEW_ENVIRONMENT
 922     globals->get_environment_mgr()->update(0);  // FIXME: use real delta time
 923 #endif
 924
 925     // Fix elevation.  I'm just sticking this here for now, it should
 926     // probably move eventually
 927
 928     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
 929            scenery.get_cur_elev(),
 930            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 931            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 932
 933     if ( scenery.get_cur_elev() > -9990 && cur_fdm_state->get_inited() ) {
 934         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
 935              (scenery.get_cur_elev() + alt_adjust_m - 3.0) ) {
 936             // now set aircraft altitude above ground
 937             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
 938                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 939                    scenery.get_cur_elev() + alt_adjust_m - 3.0,
 940                    scenery.get_cur_elev() + alt_adjust_m );
 941             cur_fdm_state->set_Altitude( scenery.get_cur_elev()
 942                                                 + alt_adjust_m );
 943
 944             SG_LOG( SG_ALL, SG_DEBUG,
 945                     "<*> resetting altitude to "
 946                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
 947                     << " meters" );
 948         }
 949     }
 950
 951     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
 952            scenery.get_cur_elev(),
 953            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 954            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 955
 956     // cout << "Warp = " << globals->get_warp() << endl;
 957
 958     // update "time"
 959     static bool last_clock_freeze = false;
 960
 961     if ( clock_freeze->getBoolValue() ) {
 962         // clock freeze requested
 963         if ( cur_time_override->getLongValue() == 0 ) {
 964             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
 965             globals->set_warp( 0 );
 966         }
 967     } else {
 968         // no clock freeze requested
 969         if ( last_clock_freeze == true ) {
 970             // clock just unfroze, let's set warp as the difference
 971             // between frozen time and current time so we don't get a
 972             // time jump (and corresponding sky object and lighting
 973             // jump.)
 974             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
 975             fgSetLong( "/sim/time/cur-time-override", 0 );
 976         }
 977         if ( globals->get_warp_delta() != 0 ) {
 978             globals->inc_warp( globals->get_warp_delta() );
 979         }
 980     }
 981
 982     last_clock_freeze = clock_freeze->getBoolValue();
 983
 984     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 985                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 986                cur_time_override->getLongValue(),
 987                globals->get_warp() );
 988
 989     if ( globals->get_warp_delta() != 0 ) {
 990         fgUpdateSkyAndLightingParams();
 991     }
 992
 993     // update magvar model
 994     globals->get_mag()->update( longitude->getDoubleValue()
 995                                   * SGD_DEGREES_TO_RADIANS,
 996                                 latitude->getDoubleValue()
 997                                   * SGD_DEGREES_TO_RADIANS,
 998                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
 999                                 globals->get_time_params()->getJD() );
1000
1001     // Get elapsed time (in usec) for this past frame
1002     elapsed = fgGetTimeInterval();
1003     SG_LOG( SG_ALL, SG_DEBUG,
1004             "Elapsed time interval is = " << elapsed
1005             << ", previous remainder is = " << remainder );
1006
1007     // Calculate frame rate average
1008 #ifdef FANCY_FRAME_COUNTER
1009     /* old fps calculation */
1010     if ( elapsed > 0 ) {
1011         double tmp;
1012         accum = 0.0;
1013         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1014             tmp = general.get_frame(i);
1015             accum += tmp;
1016             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1017             general.set_frame(i+1,tmp);
1018         }
1019         tmp = 1000000.0 / (float)elapsed;
1020         general.set_frame(0,tmp);
1021         // printf("frame[0] = %.2f\n", general.frames[0]);
1022         accum += tmp;
1023         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1024         // printf("ave = %.2f\n", general.frame_rate);
1025     }
1026 #else
1027     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1028         general.set_frame_rate( frames );
1029         SG_LOG( SG_ALL, SG_DEBUG,
1030                 "--> Frame rate is = " << general.get_frame_rate() );
1031         frames = 0;
1032     }
1033     last_time = t->get_cur_time();
1034     ++frames;
1035 #endif
1036
1037     // Run ATC subsystem
1038     globals->get_ATC_mgr()->update(1);  // FIXME - use real dt.
1039
1040     // Run the AI subsystem
1041     globals->get_AI_mgr()->update(1);   // FIXME - use real dt.
1042
1043     // Run flight model
1044
1045     // Calculate model iterations needed for next frame
1046     elapsed += remainder;
1047
1048     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1049                               fgGetInt("/sim/model-hz"));
1050     remainder = elapsed - ( (global_multi_loop*1000000) /
1051                             fgGetInt("/sim/model-hz") );
1052     SG_LOG( SG_ALL, SG_DEBUG,
1053             "Model iterations needed = " << global_multi_loop
1054             << ", new remainder = " << remainder );
1055
1056     // chop max interations to something reasonable if the sim was
1057     // delayed for an excesive amount of time
1058     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1059         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1060         remainder = 0;
1061     }
1062
1063     // flight model
1064     if ( global_multi_loop > 0 ) {
1065         fgUpdateTimeDepCalcs();
1066     } else {
1067         SG_LOG( SG_ALL, SG_DEBUG,
1068                 "Elapsed time is zero ... we're zinging" );
1069     }
1070
1071 #if ! defined( macintosh )
1072     // Do any I/O channel work that might need to be done
1073     fgIOProcess();
1074 #endif
1075
1076     // see if we need to load any deferred-load textures
1077     material_lib.load_next_deferred();
1078
1079     // Run audio scheduler
1080 #ifdef ENABLE_AUDIO_SUPPORT
1081     if ( fgGetBool("/sim/sound/audible")
1082            && globals->get_soundmgr()->is_working() ) {
1083         globals->get_fx()->update(1); // FIXME: use dt
1084         globals->get_soundmgr()->update(1); // FIXME: use dt
1085     }
1086 #endif
1087
1088     // redraw display
1089     fgRenderFrame();
1090
1091     // see if we need to load any new scenery tiles
1092     double visibility_meters = fgGetDouble("/environment/visibility-m");
1093     global_tile_mgr.update( longitude->getDoubleValue(),
1094                             latitude->getDoubleValue(), visibility_meters );
1095
1096     SG_LOG( SG_ALL, SG_DEBUG, "" );
1097 }
1098
1099
1100 // This is the top level master main function that is registered as
1101 // our idle funciton
1102
1103 // The first few passes take care of initialization things (a couple
1104 // per pass) and once everything has been initialized fgMainLoop from
1105 // then on.
1106
1107 static void fgIdleFunction ( void ) {
1108     // printf("idle state == %d\n", idle_state);
1109
1110     if ( idle_state == 0 ) {
1111         // Initialize the splash screen right away
1112         if ( fgGetBool("/sim/startup/splash-screen") ) {
1113             fgSplashInit();
1114         }
1115
1116         idle_state++;
1117     } else if ( idle_state == 1 ) {
1118         // Initialize audio support
1119 #ifdef ENABLE_AUDIO_SUPPORT
1120
1121         // Start the intro music
1122         if ( fgGetBool("/sim/startup/intro-music") ) {
1123             SGPath mp3file( globals->get_fg_root() );
1124             mp3file.append( "Sounds/intro.mp3" );
1125
1126             SG_LOG( SG_GENERAL, SG_INFO,
1127                     "Starting intro music: " << mp3file.str() );
1128
1129 #if defined( __CYGWIN__ )
1130             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1131 #elif defined( WIN32 )
1132             string command = "start /m " + mp3file.str();
1133 #else
1134             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1135 #endif
1136
1137             system ( command.c_str() );
1138         }
1139
1140         // This is an 'easter egg' which is kind of a hard thing to
1141         // hide in an open source project -- so I won't try very hard
1142         // to hide it.  If you are looking at this now, please, you
1143         // don't want to ruin the surprise. :-) Just forget about it
1144         // and don't look any further; unless it is causing an actual
1145         // problem for you, which it shouldn't, and I hope it doesn't!
1146         // :-)
1147         if ( globals->get_time_params()->getGmt()->tm_mon == 4
1148              && globals->get_time_params()->getGmt()->tm_mday == 19 )
1149         {
1150             string url = "http://www.flightgear.org/Music/invasion.mp3";
1151 #if defined( __CYGWIN__ ) || defined( WIN32 )
1152             string command = "start /m " + url;
1153 #else
1154             string command = "mpg123 " + url + "> /dev/null 2>&1";
1155 #endif
1156             system( command.c_str() );
1157         }
1158
1159 #endif
1160
1161         idle_state++;
1162     } else if ( idle_state == 2 ) {
1163         // These are a few miscellaneous things that aren't really
1164         // "subsystems" but still need to be initialized.
1165
1166 #ifdef USE_GLIDE
1167         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1168             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1169         }
1170 #endif
1171
1172         idle_state++;
1173     } else if ( idle_state == 3 ) {
1174         // This is the top level init routine which calls all the
1175         // other subsystem initialization routines.  If you are adding
1176         // a subsystem to flightgear, its initialization call should
1177         // located in this routine.
1178         if( !fgInitSubsystems()) {
1179             SG_LOG( SG_GENERAL, SG_ALERT,
1180                     "Subsystem initializations failed ..." );
1181             exit(-1);
1182         }
1183
1184         idle_state++;
1185     } else if ( idle_state == 4 ) {
1186         // setup OpenGL view parameters
1187         fgInitVisuals();
1188
1189         idle_state++;
1190     } else if ( idle_state == 5 ) {
1191
1192         idle_state++;
1193     } else if ( idle_state == 6 ) {
1194         // sleep(1);
1195         idle_state = 1000;
1196
1197         cout << "Panel visible = " << fgPanelVisible() << endl;
1198         fgReshape( fgGetInt("/sim/startup/xsize"),
1199                    fgGetInt("/sim/startup/ysize") );
1200     }
1201
1202     if ( idle_state == 1000 ) {
1203         // We've finished all our initialization steps, from now on we
1204         // run the main loop.
1205
1206         glutIdleFunc(fgMainLoop);
1207     } else {
1208         if ( fgGetBool("/sim/startup/splash-screen") ) {
1209             fgSplashUpdate(0.0);
1210         }
1211     }
1212 }
1213
1214 // options.cxx needs to see this for toggle_panel()
1215 // Handle new window size or exposure
1216 void fgReshape( int width, int height ) {
1217     int view_h;
1218
1219     if ( (!fgGetBool("/sim/virtual-cockpit"))
1220          && fgPanelVisible() && idle_state == 1000 ) {
1221         view_h = (int)(height * (current_panel->getViewHeight() -
1222                                  current_panel->getYOffset()) / 768.0);
1223     } else {
1224         view_h = height;
1225     }
1226
1227     // for all views
1228     FGViewMgr *viewmgr = globals->get_viewmgr();
1229     for ( int i = 0; i < viewmgr->size(); ++i ) {
1230       viewmgr->get_view(i)->
1231         set_aspect_ratio((float)view_h / (float)width);
1232     }
1233
1234     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1235
1236     fgSetInt("/sim/startup/xsize", width);
1237     fgSetInt("/sim/startup/ysize", height);
1238     guiInitMouse(width, height);
1239
1240     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1241                viewmgr->get_current_view()->get_v_fov() );
1242
1243     fgHUDReshape();
1244 }
1245
1246 // Initialize GLUT and define a main window
1247 int fgGlutInit( int *argc, char **argv ) {
1248
1249 #if !defined( macintosh )
1250     // GLUT will extract all glut specific options so later on we only
1251     // need wory about our own.
1252     glutInit(argc, argv);
1253 #endif
1254
1255     // Define Display Parameters
1256     glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1257
1258     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1259             fgGetInt("/sim/startup/xsize") << "x"
1260             << fgGetInt("/sim/startup/ysize") );
1261
1262     // Define initial window size
1263     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1264                         fgGetInt("/sim/startup/ysize") );
1265
1266     // Initialize windows
1267     if ( !fgGetBool("/sim/startup/game-mode")) {
1268         // Open the regular window
1269         glutCreateWindow("FlightGear");
1270 #ifndef GLUT_WRONG_VERSION
1271     } else {
1272         // Open the cool new 'game mode' window
1273         char game_mode_str[256];
1274 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1275 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1276 #ifndef ENUM_CURRENT_SETTINGS
1277 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1278 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1279 #endif
1280
1281         DEVMODE dm;
1282         dm.dmSize = sizeof(DEVMODE);
1283         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1284         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1285         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1286         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1287                                                 fgGetInt("/sim/startup/ysize") );
1288         sprintf( game_mode_str, "%dx%d:%d@%d",
1289                          dm.dmPelsWidth,
1290                          dm.dmPelsHeight,
1291                          dm.dmBitsPerPel,
1292                          dm.dmDisplayFrequency );
1293 #else
1294         // Open the cool new 'game mode' window
1295         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1296                  fgGetInt("/sim/startup/xsize"),
1297                  fgGetInt("/sim/startup/ysize"),
1298                  fgGetInt("/sim/rendering/bits-per-pixel"));
1299
1300 #endif // HAVE_WINDOWS_H
1301         SG_LOG( SG_GENERAL, SG_INFO,
1302                 "game mode params = " << game_mode_str );
1303         glutGameModeString( game_mode_str );
1304         glutEnterGameMode();
1305 #endif // GLUT_WRONG_VERSION
1306     }
1307
1308     // This seems to be the absolute earliest in the init sequence
1309     // that these calls will return valid info.  Too bad it's after
1310     // we've already created and sized out window. :-(
1311     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1312     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1313     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1314     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1315
1316     GLint tmp;
1317     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1318     general.set_glMaxTexSize( tmp );
1319     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1320
1321     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1322     general.set_glDepthBits( tmp );
1323     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1324
1325     return 1;
1326 }
1327
1328
1329 // Initialize GLUT event handlers
1330 int fgGlutInitEvents( void ) {
1331     // call fgReshape() on window resizes
1332     glutReshapeFunc( fgReshape );
1333
1334     // keyboard and mouse callbacks are set in FGInput::init
1335
1336 #ifdef FG_OLD_MOUSE
1337     // call guiMouseFunc() whenever our little rodent is used
1338     glutMouseFunc ( guiMouseFunc );
1339     glutMotionFunc (guiMotionFunc );
1340     glutPassiveMotionFunc (guiMotionFunc );
1341 #endif
1342
1343     // call fgMainLoop() whenever there is
1344     // nothing else to do
1345     glutIdleFunc( fgIdleFunction );
1346
1347     // draw the scene
1348     glutDisplayFunc( fgRenderFrame );
1349
1350     return 1;
1351 }
1352
1353
1354 // Main loop
1355 int mainLoop( int argc, char **argv ) {
1356
1357 #if defined( macintosh )
1358     freopen ("stdout.txt", "w", stdout );
1359     freopen ("stderr.txt", "w", stderr );
1360     argc = ccommand( &argv );
1361 #endif
1362
1363     // set default log levels
1364      sglog().setLogLevels( SG_ALL, SG_INFO );
1365
1366     string version;
1367 #ifdef FLIGHTGEAR_VERSION
1368     version = FLIGHTGEAR_VERSION;
1369 #else
1370     version = "unknown version";
1371 #endif
1372     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1373             << version << endl );
1374
1375     // Allocate global data structures.  This needs to happen before
1376     // we parse command line options
1377
1378     globals = new FGGlobals;
1379
1380 #if defined(FG_NEW_ENVIRONMENT)
1381     globals->set_environment_mgr(new FGEnvironmentMgr);
1382 #endif
1383
1384     // seed the random number generater
1385     sg_srandom_time();
1386
1387     SGRoute *route = new SGRoute;
1388     globals->set_route( route );
1389
1390     FGControls *controls = new FGControls;
1391     globals->set_controls( controls );
1392
1393     string_list *col = new string_list;
1394     globals->set_channel_options_list( col );
1395
1396     // Scan the config file(s) and command line options to see if
1397     // fg_root was specified (ignore all other options for now)
1398     fgInitFGRoot(argc, argv);
1399
1400     // Check for the correct base package version
1401     string base_version = fgBasePackageVersion();
1402     if ( !(base_version == "0.7.9") ) {
1403         // tell the operator how to use this application
1404         fgUsage();
1405
1406         SG_LOG( SG_GENERAL, SG_ALERT, "Base package check failed ... "
1407                 << "Found version " << base_version << " at: "
1408                 << globals->get_fg_root() );
1409         SG_LOG( SG_GENERAL, SG_ALERT, "Please upgrade to version 0.7.9" );
1410         exit(-1);
1411     }
1412
1413     // Initialize the Aircraft directory to "" (UIUC)
1414     aircraft_dir = "";
1415
1416     // Load the configuration parameters
1417     if ( !fgInitConfig(argc, argv) ) {
1418         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1419         exit(-1);
1420     }
1421
1422     // Initialize the Window/Graphics environment.
1423     if( !fgGlutInit(&argc, argv) ) {
1424         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1425         exit(-1);
1426     }
1427
1428     // Initialize the various GLUT Event Handlers.
1429     if( !fgGlutInitEvents() ) {
1430         SG_LOG( SG_GENERAL, SG_ALERT,
1431                 "GLUT event handler initialization failed ..." );
1432         exit(-1);
1433     }
1434
1435     // Initialize plib net interface
1436     netInit( &argc, argv );
1437
1438     // Initialize ssg (from plib).  Needs to come before we do any
1439     // other ssg stuff, but after opengl/glut has been initialized.
1440     ssgInit();
1441
1442     // Initialize the user interface (we need to do this before
1443     // passing off control to glut and before fgInitGeneral to get our
1444     // fonts !!!
1445     guiInit();
1446
1447 #ifdef GL_EXT_texture_lod_bias
1448     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1449 #endif
1450
1451     // Set position relative to glide slope if requested
1452     fgSetPosFromGlideSlope();
1453
1454     // set current_options lon/lat if an airport id is specified
1455     // cout << "3. airport_id = " << fgGetString("/sim/startup/airport-id") << endl;
1456     if ( fgGetString("/sim/startup/airport-id")[0] != '\0' ) {
1457         // fgSetPosFromAirportID( fgGetString("/sim/startup/airport-id") );
1458         fgSetPosFromAirportIDandHdg( fgGetString("/sim/startup/airport-id"),
1459                                      fgGetDouble("/orientation/heading-deg") );
1460         // set tower position (a little off the heading for single runway airports)
1461         fgSetTowerPosFromAirportID( fgGetString("/sim/startup/airport-id"), fgGetDouble("orientation/heading") );
1462     }
1463
1464     SGTime *t = fgInitTime();
1465     globals->set_time_params( t );
1466
1467     // Do some quick general initializations
1468     if( !fgInitGeneral()) {
1469         SG_LOG( SG_GENERAL, SG_ALERT,
1470                 "General initializations failed ..." );
1471         exit(-1);
1472     }
1473
1474     SGPath modelpath( globals->get_fg_root() );
1475     ssgModelPath( (char *)modelpath.c_str() );
1476
1477     // Scene graph root
1478     globals->set_scene_graph(new ssgRoot);
1479     globals->get_scene_graph()->setName( "Scene" );
1480
1481     lighting = new ssgRoot;
1482     lighting->setName( "Lighting" );
1483
1484     // Terrain branch
1485     globals->set_terrain_branch(new ssgBranch);
1486     globals->get_terrain_branch()->setName( "Terrain" );
1487     globals->get_scene_graph()->addKid( globals->get_terrain_branch() );
1488
1489     globals->set_models_branch(new ssgBranch);
1490     globals->get_models_branch()->setName( "Models" );
1491     globals->get_scene_graph()->addKid( globals->get_models_branch() );
1492
1493     globals->set_aircraft_branch(new ssgBranch);
1494     globals->get_aircraft_branch()->setName( "Aircraft" );
1495     globals->get_scene_graph()->addKid( globals->get_aircraft_branch() );
1496
1497     // Lighting
1498     globals->set_gnd_lights_branch(new ssgBranch);
1499     globals->get_gnd_lights_branch()->setName( "Ground Lighting" );
1500     lighting->addKid( globals->get_gnd_lights_branch() );
1501
1502     globals->set_rwy_lights_branch(new ssgBranch);
1503     globals->get_rwy_lights_branch()->setName( "Runway Lighting" );
1504     lighting->addKid( globals->get_rwy_lights_branch() );
1505
1506     ////////////////////////////////////////////////////////////////////
1507     // Initialize the general model subsystem.
1508     ////////////////////////////////////////////////////////////////////
1509
1510     globals->set_model_mgr(new FGModelMgr);
1511     globals->get_model_mgr()->init();
1512     globals->get_model_mgr()->bind();
1513
1514     ////////////////////////////////////////////////////////////////////
1515     // Initialize the 3D aircraft model subsystem.
1516     ////////////////////////////////////////////////////////////////////
1517
1518     globals->set_aircraft_model(new FGAircraftModel);
1519     globals->get_aircraft_model()->init();
1520     globals->get_aircraft_model()->bind();
1521
1522     ////////////////////////////////////////////////////////////////////
1523     // Initialize the view manager subsystem.
1524     ////////////////////////////////////////////////////////////////////
1525
1526     FGViewMgr *viewmgr = new FGViewMgr;
1527     globals->set_viewmgr( viewmgr );
1528     viewmgr->init();
1529     viewmgr->bind();
1530
1531
1532     // Initialize the sky
1533     SGPath ephem_data_path( globals->get_fg_root() );
1534     ephem_data_path.append( "Astro" );
1535     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1536     ephem->update( globals->get_time_params()->getMjd(),
1537                    globals->get_time_params()->getLst(),
1538                    0.0 );
1539     globals->set_ephem( ephem );
1540
1541     thesky = new SGSky;
1542
1543     SGPath sky_tex_path( globals->get_fg_root() );
1544     sky_tex_path.append( "Textures" );
1545     sky_tex_path.append( "Sky" );
1546     thesky->texture_path( sky_tex_path.str() );
1547
1548     thesky->build( 550.0, 550.0,
1549                    globals->get_ephem()->getNumPlanets(),
1550                    globals->get_ephem()->getPlanets(), 60000.0,
1551                    globals->get_ephem()->getNumStars(),
1552                    globals->get_ephem()->getStars(), 60000.0 );
1553
1554     if ( fgGetBool("/environment/clouds/status") ) {
1555         // thesky->add_cloud_layer( 2000.0, 200.0, 50.0, 40000.0,
1556         //                          SG_CLOUD_OVERCAST );
1557         thesky->add_cloud_layer( fgGetDouble("/environment/clouds/altitude-ft") *
1558                                  SG_FEET_TO_METER,
1559                                  200.0, 50.0, 40000.0,
1560                                  SG_CLOUD_MOSTLY_CLOUDY );
1561         // thesky->add_cloud_layer( 3000.0, 200.0, 50.0, 40000.0,
1562         //                          SG_CLOUD_MOSTLY_SUNNY );
1563         thesky->add_cloud_layer( 6000.0, 20.0, 10.0, 40000.0,
1564                                  SG_CLOUD_CIRRUS );
1565     }
1566
1567     // Initialize MagVar model
1568     SGMagVar *magvar = new SGMagVar();
1569     globals->set_mag( magvar );
1570
1571     // airport = new ssgBranch;
1572     // airport->setName( "Airport Lighting" );
1573     // lighting->addKid( airport );
1574
1575     // ADA
1576     fgLoadDCS();
1577     // ADA
1578
1579 #ifdef FG_NETWORK_OLK
1580     // Do the network intialization
1581     if ( fgGetBool("/sim/networking/network-olk") ) {
1582         printf("Multipilot mode %s\n",
1583                fg_net_init( globals->get_scene_graph() ) );
1584     }
1585 #endif
1586
1587     // build our custom render states
1588     fgBuildRenderStates();
1589
1590     // pass control off to the master GLUT event handler
1591     glutMainLoop();
1592
1593     // we never actually get here ... but to avoid compiler warnings,
1594     // etc.
1595     return 0;
1596 }
1597
1598
1599 // $$$ end - added VS Renganathan, 15 Oct 2K
1600 //         - added Venky         , 12 Nov 2K
1601
1602 #if defined(__linux__) && defined(__i386__)
1603
1604 static void handleFPE (int);
1605
1606 static void
1607 initFPE ()
1608 {
1609     fpu_control_t fpe_flags = 0;
1610     _FPU_GETCW(fpe_flags);
1611 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1612 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1613 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1614 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1615 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1616 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1617     _FPU_SETCW(fpe_flags);
1618     signal(SIGFPE, handleFPE);
1619 }
1620
1621 static void
1622 handleFPE (int num)
1623 {
1624   initFPE();
1625   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1626 }
1627 #endif
1628
1629 // Main entry point; catch any exceptions that have made it this far.
1630 int main ( int argc, char **argv ) {
1631
1632     // Enable floating-point exceptions for Linux/x86
1633 #if defined(__linux__) && defined(__i386__)
1634     initFPE();
1635 #endif
1636
1637     // Enable floating-point exceptions for Windows
1638 #if defined( _MSC_VER ) && defined( DEBUG )
1639     // Christian, we should document what this does
1640     _control87( _EM_INEXACT, _MCW_EM );
1641 #endif
1642
1643 #if defined( HAVE_BC5PLUS )
1644     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1645 #endif
1646
1647     // FIXME: add other, more specific
1648     // exceptions.
1649     try {
1650         mainLoop(argc, argv);
1651     } catch (sg_throwable &t) {
1652                                 // We must use cerr rather than
1653                                 // logging, since logging may be
1654                                 // disabled.
1655         cerr << "Fatal error: " << t.getFormattedMessage()
1656              << "\n (received from " << t.getOrigin() << ')' << endl;
1657         exit(1);
1658     }
1659
1660     return 0;
1661 }
1662
1663
1664 void fgLoadDCS(void) {
1665
1666     ssgEntity *ship_obj = NULL;
1667
1668     char obj_filename[25];
1669
1670     for ( int k = 0; k < 32; k++ ) {
1671         ship_pos[k]=NULL;
1672     }
1673
1674     SGPath tile_path( globals->get_fg_root());
1675     tile_path.append( "Scenery" );
1676     tile_path.append( "Objects.txt" );
1677     sg_gzifstream in( tile_path.str() );
1678     if ( ! in.is_open() ) {
1679         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1680     } else {
1681
1682         SGPath modelpath( globals->get_fg_root() );
1683         modelpath.append( "Models" );
1684         modelpath.append( "Geometry" );
1685
1686         SGPath texturepath( globals->get_fg_root() );
1687         texturepath.append( "Models" );
1688         texturepath.append( "Textures" );
1689
1690         ssgModelPath( (char *)modelpath.c_str() );
1691         ssgTexturePath( (char *)texturepath.c_str() );
1692
1693         ship_sel = new ssgSelector;
1694
1695         char c;
1696         while ( ! in.eof() ) {
1697             in >> ::skipws;
1698             if ( in.get( c ) && c == '#' ) {
1699                 in >> skipeol;
1700             } else {
1701                 in.putback(c);
1702                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1703                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1704                    int chj=getchar();*/
1705
1706                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1707                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1708
1709                 ship_pos[objc] = new ssgTransform;
1710
1711                 // type "repeat" in objects.txt to load one more
1712                 // instance of the last object.
1713
1714                 if ( strcmp(obj_filename,"repeat") != 0) {
1715                     ship_obj = ssgLoad( obj_filename );
1716                 }
1717
1718                 if ( ship_obj != NULL ) {
1719                                         ship_obj->setName(obj_filename);
1720                                 if (objc == 0)
1721                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1722                                         else
1723                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1724                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1725                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1726                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1727                             << obj_filename );
1728                 } else {
1729                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1730                             << obj_filename );
1731                 }
1732
1733                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1734                                 //const char *extn = file_extension ( obj_filename ) ;
1735                                 if ( objc == 1 ){
1736                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1737                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1738                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1739                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1740                                         int ltype[500], light_type;
1741                                         static int ltcount = 0;
1742                                     string token;
1743                                         sgVec3 rway_dir,rway_normal,lightpt;
1744                                         Point3D node;
1745                                         modelpath.append(obj_filename);
1746                                         sg_gzifstream in1( modelpath.str() );
1747                                         if ( ! in1.is_open() ) {
1748                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1749                                         } else {
1750                                                 while ( ! in1.eof() ) {
1751                                                         in1 >> ::skipws;
1752                                                         if ( in1.get( c ) && c == '#' ) {
1753                                                                 in1 >> skipeol;
1754                                                         } else {
1755                                                                 in1.putback(c);
1756                                                                 in1 >> token;
1757                                                                 //cout << token << endl;
1758                                                                 if ( token == "runway" ) {
1759                                                                         in1 >> node;
1760                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1761                                                                 } else if ( token == "edgelight" ) {
1762                                                                         in1 >> node;
1763                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1764                                                                         light_type = 1;
1765                                                                 } else if ( token == "taxi" ) {
1766                                                                         in1 >> node;
1767                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1768                                                                         light_type = 2;
1769                                                                 } else if ( token == "vasi" ) {
1770                                                                         in1 >> node;
1771                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1772                                                                         light_type = 3;
1773                                                                 } else if ( token == "threshold" ) {
1774                                                                         in1 >> node;
1775                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1776                                                                         light_type = 4;
1777                                                                 } else if ( token == "rabbit" ) {
1778                                                                         in1 >> node;
1779                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1780                                                                         light_type = 5;
1781                                                                 } else if ( token == "ols" ) {
1782                                                                         in1 >> node;
1783                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1784                                                                         light_type = 6;
1785                                                                 } else if ( token == "red" ) {
1786                                                                         in1 >> node;
1787                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1788                                                                         light_type = 7;
1789                                                                 } else if ( token == "green" ) {
1790                                                                         in1 >> node;
1791                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1792                                                                         light_type = 8;
1793                                                                 } else if ( token == "lp" ) {
1794                                                                         in1 >> node;
1795                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1796                                                                         lightpoints->add( lightpt );
1797                                                                         lightnormals->add( rway_normal );
1798                                                                         lightdir->add( rway_dir );
1799                                                                         ltype[ltcount]= light_type;
1800                                                                         ltcount++;
1801                                                                 }
1802                                                                 if (in1.eof()) break;
1803                                                         }
1804                                                 }  //while
1805
1806                                                 if ( lightpoints->getNum() ) {
1807                                                         ssgBranch *lightpoints_branch;
1808                                                         long int dummy = -999;
1809                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1810                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1811                                                         dummy_tile->ols_transform = new ssgTransform;
1812
1813                                                         // call function to generate the runway lights
1814                                                         lightpoints_branch =
1815                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1816                                                                                                                                 lightdir, ltype);
1817                                                         lightpoints_brightness->addKid(lightpoints_branch);
1818                                                         lightpoints_transform->addKid(lightpoints_brightness);
1819                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1820                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1821                                                         lightpoints_transform->ref();
1822                                                         globals->get_gnd_lights_branch()->addKid( lightpoints_transform );
1823                                                 }
1824                                         } //if in1
1825                 } //if objc
1826                                 // end hack for deck lights
1827
1828                 objc++;
1829
1830                 if (in.eof()) break;
1831             }
1832         } // while
1833
1834         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
1835
1836         globals->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
1837     }
1838
1839     return;
1840  }
1841
1842
1843 void fgUpdateDCS (void) {
1844
1845     // double eye_lat,eye_lon,eye_alt;
1846     // static double obj_head;
1847     double sl_radius,obj_latgc;
1848     // float nresultmat[4][4];
1849     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
1850     double bz[3];
1851
1852     // Instantaneous Geodetic Lat/Lon/Alt of moving object
1853     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
1854
1855     // Deck should be the first object in objects.txt in case of fdm=ada
1856
1857     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
1858                 if ((fdm->get_iaux(1))==1)
1859                 {
1860                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
1861                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
1862                         obj_alt[1] = fdm->get_daux(3);
1863                         obj_pitch[1] = fdm->get_faux(1);
1864                         obj_roll[1] = fdm->get_faux(2);
1865                 }
1866     }
1867
1868     for ( int m = 0; m < objc; m++ ) {
1869         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
1870         //int v=getchar();
1871
1872         //Geodetic to Geocentric angles for rotation
1873         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
1874
1875         //moving object gbs-posn in cartesian coords
1876         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
1877         Point3D obj_pos = sgGeodToCart( obj_posn );
1878
1879         // Translate moving object w.r.t eye
1880         Point3D Objtrans = obj_pos-scenery.get_center();
1881         bz[0]=Objtrans.x();
1882         bz[1]=Objtrans.y();
1883         bz[2]=Objtrans.z();
1884
1885        // rotate dynamic objects for lat,lon & alt and other motion about its axes
1886
1887         sgMat4 sgTRANS;
1888         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
1889
1890         sgVec3 ship_fwd,ship_rt,ship_up;
1891         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
1892         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
1893         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
1894
1895         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
1896         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
1897         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
1898         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
1899         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
1900         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
1901
1902         sgMat4 sgTUX;
1903         sgCopyMat4( sgTUX, sgROT_hdg );
1904         sgPostMultMat4( sgTUX, sgROT_pitch );
1905         sgPostMultMat4( sgTUX, sgROT_roll );
1906         sgPostMultMat4( sgTUX, sgROT_lat );
1907         sgPostMultMat4( sgTUX, sgROT_lon );
1908         sgPostMultMat4( sgTUX, sgTRANS );
1909
1910         sgCoord shippos;
1911         sgSetCoord(&shippos, sgTUX );
1912         ship_pos[m]->setTransform( &shippos );
1913         // temporary hack for deck lights - ultimately should move to PLib (when ??)
1914         if (m == 1) {
1915                 if (lightpoints_transform) {
1916                         lightpoints_transform->setTransform( &shippos );
1917                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
1918                         if ( sun_angle > 89 ) {
1919                                 lightpoints_brightness->select(0x01);
1920                         } else {
1921                                 lightpoints_brightness->select(0x00);
1922                         }
1923                 }
1924
1925                 float elev;
1926                 sgVec3 rp,to;
1927                 float *vp;
1928                 float alt;
1929                 float ref_elev;
1930                 sgXformPnt3( rp, rway_ols, sgTUX );
1931                 vp = globals->get_current_view()->get_view_pos();
1932             to[0] = rp[0]-vp[0];
1933             to[1] = rp[1]-vp[1];
1934             to[2] = rp[2]-vp[2];
1935                 float dist = sgLengthVec3( to );
1936                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
1937
1938                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
1939
1940             ref_elev = elev - 3.75; // +ve above, -ve below
1941
1942                 unsigned int sel;
1943                 sel = 0xFF;
1944 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1945 //              if (ref_elev > 0.51) sel = 0x21;
1946 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
1947 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
1948 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
1949 //              if (ref_elev < -0.51) sel = 0x30;
1950 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1951                 dummy_tile->lightmaps_sequence->select(sel);
1952
1953                 sgVec3 up;
1954                 sgCopyVec3 (up, ship_up);
1955                 if (dist > 750)
1956                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
1957                 else
1958                         sgScaleVec3 (up, 4.0*ref_elev);
1959                 dummy_tile->ols_transform->setTransform(up);
1960                 //cout << "ref_elev  " << ref_elev << endl;
1961         }
1962     // end hack for deck lights
1963
1964     }
1965     if ( ship_sel != NULL ) {
1966         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
1967     }
1968 }
1969
1970 // $$$ end - added VS Renganathan, 15 Oct 2K
1971 //           added Venky         , 12 Nov 2K