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 static double delta_time_sec = 0;
 152
 153
 154 #ifndef FG_NEW_ENVIRONMENT
 155 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 156 #else
 157 #  include <Environment/environment_mgr.hxx>
 158 #endif
 159
 160 #include "version.h"
 161
 162 #include "fg_init.hxx"
 163 #include "fg_io.hxx"
 164 #include "fg_props.hxx"
 165 #include "globals.hxx"
 166 #include "splash.hxx"
 167 #include "viewmgr.hxx"
 168 #include "options.hxx"
 169 #include "logger.hxx"
 170
 171 #ifdef macintosh
 172 #  include <console.h>          // -dw- for command line dialog
 173 #endif
 174
 175
 176 FGEventMgr global_events;
 177
 178 // This is a record containing a bit of global housekeeping information
 179 FGGeneral general;
 180
 181 // Specify our current idle function state.  This is used to run all
 182 // our initializations out of the glutIdleLoop() so that we can get a
 183 // splash screen up and running right away.
 184 static int idle_state = 0;
 185 static long global_multi_loop;
 186
 187 // forward declaration
 188 void fgReshape( int width, int height );
 189
 190 // fog constants.  I'm a little nervous about putting actual code out
 191 // here but it seems to work (?)
 192 static const double m_log01 = -log( 0.01 );
 193 static const double sqrt_m_log01 = sqrt( m_log01 );
 194 static GLfloat fog_exp_density;
 195 static GLfloat fog_exp2_density;
 196 static GLfloat fog_exp2_punch_through;
 197
 198 ssgRoot *lighting = NULL;
 199 // ssgBranch *airport = NULL;
 200
 201 #ifdef FG_NETWORK_OLK
 202 ssgSelector *fgd_sel = NULL;
 203 ssgTransform *fgd_pos = NULL;
 204 #endif
 205
 206 // current fdm/position used for view
 207 FGInterface cur_view_fdm;
 208
 209 // Sky structures
 210 SGSky *thesky;
 211
 212 // hack
 213 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 214 {
 215   {  1.0f,  0.0f,  0.0f,  0.0f },
 216   {  0.0f,  0.0f, -1.0f,  0.0f },
 217   {  0.0f,  1.0f,  0.0f,  0.0f },
 218   {  0.0f,  0.0f,  0.0f,  1.0f }
 219 };
 220
 221 // The following defines flightgear options. Because glutlib will also
 222 // want to parse its own options, those options must not be included here
 223 // or they will get parsed by the main program option parser. Hence case
 224 // is significant for any option added that might be in conflict with
 225 // glutlib's parser.
 226 //
 227 // glutlib parses for:
 228 //    -display
 229 //    -direct   (invalid in Win32)
 230 //    -geometry
 231 //    -gldebug
 232 //    -iconized
 233 //    -indirect (invalid in Win32)
 234 //    -synce
 235 //
 236 // Note that glutlib depends upon strings while this program's
 237 // option parser wants only initial characters followed by numbers
 238 // or pathnames.
 239 //
 240
 241
 242 ssgSimpleState *default_state;
 243 ssgSimpleState *hud_and_panel;
 244 ssgSimpleState *menus;
 245
 246 SGTimeStamp last_time_stamp;
 247 SGTimeStamp current_time_stamp;
 248
 249 void fgBuildRenderStates( void ) {
 250     default_state = new ssgSimpleState;
 251     default_state->ref();
 252     default_state->disable( GL_TEXTURE_2D );
 253     default_state->enable( GL_CULL_FACE );
 254     default_state->enable( GL_COLOR_MATERIAL );
 255     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 256     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 257     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 258     default_state->disable( GL_BLEND );
 259     default_state->disable( GL_ALPHA_TEST );
 260     default_state->disable( GL_LIGHTING );
 261
 262     hud_and_panel = new ssgSimpleState;
 263     hud_and_panel->ref();
 264     hud_and_panel->disable( GL_CULL_FACE );
 265     hud_and_panel->disable( GL_TEXTURE_2D );
 266     hud_and_panel->disable( GL_LIGHTING );
 267     hud_and_panel->enable( GL_BLEND );
 268
 269     menus = new ssgSimpleState;
 270     menus->ref();
 271     menus->disable( GL_CULL_FACE );
 272     menus->disable( GL_TEXTURE_2D );
 273     menus->enable( GL_BLEND );
 274 }
 275
 276
 277 // fgInitVisuals() -- Initialize various GL/view parameters
 278 void fgInitVisuals( void ) {
 279     fgLIGHT *l;
 280
 281     l = &cur_light_params;
 282
 283 #ifndef GLUT_WRONG_VERSION
 284     // Go full screen if requested ...
 285     if ( fgGetBool("/sim/startup/fullscreen") ) {
 286         glutFullScreen();
 287     }
 288 #endif
 289
 290     // If enabled, normal vectors specified with glNormal are scaled
 291     // to unit length after transformation.  Enabling this has
 292     // performance implications.  See the docs for glNormal.
 293     // glEnable( GL_NORMALIZE );
 294
 295     glEnable( GL_LIGHTING );
 296     glEnable( GL_LIGHT0 );
 297     glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 298
 299     sgVec3 sunpos;
 300     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 301     ssgGetLight( 0 ) -> setPosition( sunpos );
 302
 303     glFogi (GL_FOG_MODE, GL_EXP2);
 304     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 305          (!fgGetBool("/sim/rendering/shading"))) {
 306         // if fastest fog requested, or if flat shading force fastest
 307         glHint ( GL_FOG_HINT, GL_FASTEST );
 308     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 309         glHint ( GL_FOG_HINT, GL_NICEST );
 310     }
 311     if ( fgGetBool("/sim/rendering/wireframe") ) {
 312         // draw wire frame
 313         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 314     }
 315
 316     // This is the default anyways, but it can't hurt
 317     glFrontFace ( GL_CCW );
 318
 319     // Just testing ...
 320     // glEnable(GL_POINT_SMOOTH);
 321     // glEnable(GL_LINE_SMOOTH);
 322     // glEnable(GL_POLYGON_SMOOTH);
 323 }
 324
 325
 326 // For HiRes screen Dumps using Brian Pauls TR Library
 327 void trRenderFrame( void ) {
 328
 329     if ( fgPanelVisible() ) {
 330         GLfloat height = fgGetInt("/sim/startup/ysize");
 331         GLfloat view_h =
 332             (current_panel->getViewHeight() - current_panel->getYOffset())
 333             * (height / 768.0) + 1;
 334         glTranslatef( 0.0, view_h, 0.0 );
 335     }
 336
 337     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 338     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 339
 340     fgLIGHT *l = &cur_light_params;
 341
 342     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 343                  l->adj_fog_color[2], l->adj_fog_color[3]);
 344
 345     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 346
 347     // set the opengl state to known default values
 348     default_state->force();
 349
 350     glEnable( GL_FOG );
 351     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 352     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 353     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 354
 355     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 356     // we only update GL_AMBIENT for our lights we will never get
 357     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 358     // explicitely to black.
 359     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 360
 361     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 362
 363     // texture parameters
 364     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 365     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 366
 367     // we need a white diffuse light for the phase of the moon
 368     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 369     thesky->preDraw();
 370
 371     // draw the ssg scene
 372     // return to the desired diffuse color
 373     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 374     glEnable( GL_DEPTH_TEST );
 375     ssgSetNearFar( scene_nearplane, scene_farplane );
 376     ssgCullAndDraw( globals->get_scene_graph() );
 377
 378     // draw the lights
 379     glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 380     ssgSetNearFar( scene_nearplane, scene_farplane );
 381     ssgCullAndDraw( lighting );
 382
 383     thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 384
 385     globals->get_model_mgr()->draw();
 386     globals->get_aircraft_model()->draw();
 387
 388     // need to do this here as hud_and_panel state is static to
 389     // main.cxx  and HUD and Panel routines have to be called with
 390     // knowledge of the the TR struct < see gui.cxx::HighResDump()
 391     hud_and_panel->apply();
 392 }
 393
 394
 395 // Update all Visuals (redraws anything graphics related)
 396 void fgRenderFrame() {
 397
 398     // Process/manage pending events
 399     global_events.update( delta_time_sec );
 400
 401     static const SGPropertyNode *longitude
 402         = fgGetNode("/position/longitude-deg");
 403     static const SGPropertyNode *latitude
 404         = fgGetNode("/position/latitude-deg");
 405     static const SGPropertyNode *altitude
 406         = fgGetNode("/position/altitude-ft");
 407     static const SGPropertyNode *groundlevel_nearplane
 408         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 409
 410     // Update the default (kludged) properties.
 411     fgUpdateProps();
 412
 413     FGViewer *current__view = globals->get_current_view();
 414
 415     fgLIGHT *l = &cur_light_params;
 416     static double last_visibility = -9999;
 417
 418     // update fog params
 419     double actual_visibility       = thesky->get_visibility();
 420     if ( actual_visibility != last_visibility ) {
 421         last_visibility = actual_visibility;
 422
 423         fog_exp_density = m_log01 / actual_visibility;
 424         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 425         fog_exp2_punch_through = sqrt_m_log01 / ( actual_visibility * 2.5 );
 426     }
 427
 428     // double angle;
 429     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 430     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 431     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 432     // GLfloat mat_shininess[] = { 10.0 };
 433     GLbitfield clear_mask;
 434
 435     if ( idle_state != 1000 ) {
 436         // still initializing, draw the splash screen
 437         if ( fgGetBool("/sim/startup/splash-screen") ) {
 438             fgSplashUpdate(0.0);
 439         }
 440         // Keep resetting sim time while the sim is initializing
 441         globals->set_sim_time_sec( 0.0 );
 442     } else {
 443         // idle_state is now 1000 meaning we've finished all our
 444         // initializations and are running the main loop, so this will
 445         // now work without seg faulting the system.
 446
 447         // calculate our current position in cartesian space
 448         scenery.set_center( scenery.get_next_center() );
 449
 450         // update view port
 451         fgReshape( fgGetInt("/sim/startup/xsize"),
 452                    fgGetInt("/sim/startup/ysize") );
 453
 454         // set the sun position
 455         glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );
 456
 457         clear_mask = GL_DEPTH_BUFFER_BIT;
 458         if ( fgGetBool("/sim/rendering/wireframe") ) {
 459             clear_mask |= GL_COLOR_BUFFER_BIT;
 460         }
 461
 462         if ( fgGetBool("/sim/rendering/skyblend") ) {
 463             if ( fgGetBool("/sim/rendering/textures") ) {
 464                 // glClearColor(black[0], black[1], black[2], black[3]);
 465                 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 466                              l->adj_fog_color[2], l->adj_fog_color[3]);
 467                 clear_mask |= GL_COLOR_BUFFER_BIT;
 468             }
 469         } else {
 470             glClearColor(l->sky_color[0], l->sky_color[1],
 471                          l->sky_color[2], l->sky_color[3]);
 472             clear_mask |= GL_COLOR_BUFFER_BIT;
 473         }
 474         glClear( clear_mask );
 475
 476         // Tell GL we are switching to model view parameters
 477
 478         // I really should create a derived ssg node or use a call
 479         // back or something so that I can draw the sky within the
 480         // ssgCullAndDraw() function, but for now I just mimic what
 481         // ssg does to set up the model view matrix
 482         glMatrixMode(GL_MODELVIEW);
 483         glLoadIdentity();
 484         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 485
 486         // set the opengl state to known default values
 487         default_state->force();
 488
 489         // update fog params if visibility has changed
 490         double visibility_meters = fgGetDouble("/environment/visibility-m");
 491         thesky->set_visibility(visibility_meters);
 492
 493         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 494                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 495                             / (double)fgGetInt("/sim/model-hz") );
 496
 497         // Set correct opengl fog density
 498         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 499
 500         // update the sky dome
 501         if ( fgGetBool("/sim/rendering/skyblend") ) {
 502             /* cout << "thesky->repaint() sky_color = "
 503                  << cur_light_params.sky_color[0] << " "
 504                  << cur_light_params.sky_color[1] << " "
 505                  << cur_light_params.sky_color[2] << " "
 506                  << cur_light_params.sky_color[3] << endl;
 507             cout << "    fog = "
 508                  << cur_light_params.fog_color[0] << " "
 509                  << cur_light_params.fog_color[1] << " "
 510                  << cur_light_params.fog_color[2] << " "
 511                  << cur_light_params.fog_color[3] << endl;
 512             cout << "    sun_angle = " << cur_light_params.sun_angle
 513                  << "    moon_angle = " << cur_light_params.moon_angle
 514                  << endl; */
 515             thesky->repaint( cur_light_params.sky_color,
 516                              cur_light_params.adj_fog_color,
 517                              cur_light_params.sun_angle,
 518                              cur_light_params.moon_angle,
 519                              globals->get_ephem()->getNumPlanets(),
 520                              globals->get_ephem()->getPlanets(),
 521                              globals->get_ephem()->getNumStars(),
 522                              globals->get_ephem()->getStars() );
 523
 524             /* cout << "thesky->reposition( view_pos = " << view_pos[0] << " "
 525                  << view_pos[1] << " " << view_pos[2] << endl;
 526             cout << "    zero_elev = " << zero_elev[0] << " "
 527                  << zero_elev[1] << " " << zero_elev[2]
 528                  << " lon = " << cur_fdm_state->get_Longitude()
 529                  << " lat = " << cur_fdm_state->get_Latitude() << endl;
 530             cout << "    sun_rot = " << cur_light_params.sun_rotation
 531                  << " gst = " << SGTime::cur_time_params->getGst() << endl;
 532             cout << "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 533                  << " sun dec = " << globals->get_ephem()->getSunDeclination()
 534                  << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 535                  << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 536
 537             thesky->reposition( current__view->get_view_pos(),
 538                                 current__view->get_zero_elev(),
 539                                 current__view->get_world_up(),
 540                                 longitude->getDoubleValue()
 541                                   * SGD_DEGREES_TO_RADIANS,
 542                                 latitude->getDoubleValue()
 543                                   * SGD_DEGREES_TO_RADIANS,
 544                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
 545                                 cur_light_params.sun_rotation,
 546                                 globals->get_time_params()->getGst(),
 547                                 globals->get_ephem()->getSunRightAscension(),
 548                                 globals->get_ephem()->getSunDeclination(),
 549                                 50000.0,
 550                                 globals->get_ephem()->getMoonRightAscension(),
 551                                 globals->get_ephem()->getMoonDeclination(),
 552                                 50000.0 );
 553         }
 554
 555         glEnable( GL_DEPTH_TEST );
 556         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 557             glEnable( GL_FOG );
 558             glFogi( GL_FOG_MODE, GL_EXP2 );
 559             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 560         }
 561
 562         // set sun/lighting parameters
 563         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 564
 565         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 566         // we only update GL_AMBIENT for our lights we will never get
 567         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 568         // explicitely to black.
 569         GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 570         GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 571         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 572
 573         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 574         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 575         // ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_white );
 576
 577         // texture parameters
 578         // glEnable( GL_TEXTURE_2D );
 579         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 580         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 581
 582         // glMatrixMode( GL_PROJECTION );
 583         // glLoadIdentity();
 584         ssgSetFOV( current__view->get_h_fov(),
 585                    current__view->get_v_fov() );
 586
 587         double agl = current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 588             - scenery.get_cur_elev();
 589
 590         if ( agl > 10.0 ) {
 591             scene_nearplane = 10.0f;
 592             scene_farplane = 120000.0f;
 593         } else {
 594             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 595             scene_farplane = 120000.0f;
 596         }
 597
 598         ssgSetNearFar( scene_nearplane, scene_farplane );
 599
 600         // $$$ begin - added VS Renganthan 17 Oct 2K
 601         if(objc)
 602           fgUpdateDCS();
 603         // $$$ end - added VS Renganthan 17 Oct 2K
 604
 605 # ifdef FG_NETWORK_OLK
 606         if ( fgGetBool("/sim/networking/network-olk") ) {
 607             sgCoord fgdpos;
 608             other = head->next;             /* put listpointer to start  */
 609             while ( other != tail) {        /* display all except myself */
 610                 if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 611                     other->fgd_sel->select(1);
 612                     sgSetCoord( &fgdpos, other->sgFGD_COORD );
 613                     other->fgd_pos->setTransform( &fgdpos );
 614                 }
 615                 other = other->next;
 616             }
 617
 618             // fgd_sel->select(1);
 619             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 620             // sgCoord fgdpos;
 621             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 622             // fgd_pos->setTransform( &fgdpos);
 623         }
 624 # endif
 625
 626         // position tile nodes and update range selectors
 627         global_tile_mgr.prep_ssg_nodes(visibility_meters);
 628
 629         if ( fgGetBool("/sim/rendering/skyblend") ) {
 630             // draw the sky backdrop
 631
 632             // we need a white diffuse light for the phase of the moon
 633             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 634
 635             thesky->preDraw();
 636
 637             // return to the desired diffuse color
 638             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 639         }
 640
 641         // draw the ssg scene
 642         glEnable( GL_DEPTH_TEST );
 643
 644         ssgSetNearFar( scene_nearplane, scene_farplane );
 645         ssgCullAndDraw( globals->get_scene_graph() );
 646
 647         // change state for lighting here
 648
 649         // draw lighting
 650         // Set punch through fog density
 651         glFogf (GL_FOG_DENSITY, fog_exp2_punch_through);
 652
 653 #ifdef FG_EXPERIMENTAL_LIGHTING
 654         // Enable states for drawing points with GL_extension
 655         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 656             glEnable(GL_POINT_SMOOTH);
 657             float quadratic[3] = {1.0, 0.01, 0.0001};
 658             // get the address of our OpenGL extensions
 659 #if !defined(sgi)
 660             glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
 661                 wglGetProcAddress("glPointParameterfEXT");
 662             glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
 663                 wglGetProcAddress("glPointParameterfvEXT");
 664 #endif
 665             // makes the points fade as they move away
 666             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 667             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 668             glPointSize(4.0);
 669
 670             // Enable states for drawing runway lights with spherical mapping
 671             glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 672             glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 673             glEnable(GL_TEXTURE_GEN_S);
 674             glEnable(GL_TEXTURE_GEN_T);
 675
 676             //Maybe this is not the best way, but it works !!
 677             glPolygonMode(GL_FRONT, GL_POINT);
 678             glCullFace(GL_BACK);
 679             glEnable(GL_CULL_FACE);
 680         }
 681
 682         glDisable( GL_LIGHTING );
 683         // blending function for runway lights
 684         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 685         glEnable(GL_BLEND);
 686 #endif
 687
 688         ssgSetNearFar( scene_nearplane, scene_farplane );
 689         ssgCullAndDraw( lighting );
 690
 691
 692 #ifdef FG_EXPERIMENTAL_LIGHTING
 693         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 694             // Disable states used for runway lighting
 695             glPolygonMode(GL_FRONT, GL_FILL);
 696
 697             glDisable(GL_TEXTURE_GEN_S);
 698             glDisable(GL_TEXTURE_GEN_T);
 699             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 700                                   default_attenuation);
 701         }
 702
 703         glPointSize(1.0);
 704 #endif
 705
 706         if ( fgGetBool("/sim/rendering/skyblend") ) {
 707             // draw the sky cloud layers
 708             thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 709         }
 710
 711         globals->get_model_mgr()->draw();
 712         globals->get_aircraft_model()->draw();
 713
 714         // display HUD && Panel
 715         glDisable( GL_FOG );
 716         glDisable( GL_DEPTH_TEST );
 717         // glDisable( GL_CULL_FACE );
 718         // glDisable( GL_TEXTURE_2D );
 719
 720         // update the input subsystem
 721         current_input.update(delta_time_sec);
 722
 723         // update the controls subsystem
 724         globals->get_controls()->update(delta_time_sec);
 725
 726         hud_and_panel->apply();
 727         fgCockpitUpdate();
 728
 729         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 730         // This only works properly if called before the panel call
 731         globals->get_ATC_display()->update(delta_time_sec);
 732
 733         // update the panel subsystem
 734         if ( current_panel != NULL ) {
 735             current_panel->update(delta_time_sec);
 736         }
 737
 738         // We can do translucent menus, so why not. :-)
 739         menus->apply();
 740         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 741         puDisplay();
 742         // glDisable ( GL_BLEND ) ;
 743
 744         // glEnable( GL_FOG );
 745
 746         globals->get_logger()->update(delta_time_sec);
 747     }
 748
 749     glutSwapBuffers();
 750 }
 751
 752
 753 // Update internal time dependent calculations (i.e. flight model)
 754 // FIXME: this distinction is obsolete; all subsystems now get delta
 755 // time on update.
 756 void fgUpdateTimeDepCalcs() {
 757     static bool inited = false;
 758
 759     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 760
 761     fgLIGHT *l = &cur_light_params;
 762     int i;
 763
 764     long multi_loop = 1;
 765
 766     // Initialize the FDM here if it hasn't been and if we have a
 767     // scenery elevation hit.
 768
 769     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 770     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 771
 772     if ( !cur_fdm_state->get_inited() && scenery.get_cur_elev() > -9990 ) {
 773         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 774
 775         cur_fdm_state->init();
 776         if ( cur_fdm_state->get_bound() ) {
 777             cur_fdm_state->unbind();
 778         }
 779         cur_fdm_state->bind();
 780     }
 781
 782     // conceptually, the following block could be done for each fdm
 783     // instance ...
 784     if ( !cur_fdm_state->get_inited() ) {
 785         // do nothing, fdm isn't inited yet
 786     } else {
 787         // we have been inited, and  we are good to go ...
 788
 789         if ( !inited ) {
 790             inited = true;
 791         }
 792
 793         globals->get_autopilot()->update(delta_time_sec);
 794         cur_fdm_state->update(delta_time_sec);
 795         FGSteam::update(delta_time_sec);
 796     }
 797
 798     if ( !strcmp(fgGetString("/sim/view-mode"), "pilot") ) {
 799         cur_view_fdm = *cur_fdm_state;
 800         // do nothing
 801     }
 802
 803     globals->get_model_mgr()->update(delta_time_sec);
 804     globals->get_aircraft_model()->update(delta_time_sec);
 805
 806     // update the view angle
 807     globals->get_viewmgr()->update(delta_time_sec);
 808
 809     l->UpdateAdjFog();
 810
 811     // Update solar system
 812     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 813                                   globals->get_time_params()->getLst(),
 814                                   cur_fdm_state->get_Latitude() );
 815
 816     // Update radio stack model
 817     current_radiostack->update(delta_time_sec);
 818 }
 819
 820
 821 void fgInitTimeDepCalcs( void ) {
 822     // noop for now
 823 }
 824
 825
 826 static const double alt_adjust_ft = 3.758099;
 827 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 828
 829
 830 // What should we do when we have nothing else to do?  Let's get ready
 831 // for the next move and update the display?
 832 static void fgMainLoop( void ) {
 833
 834     // Update the elapsed time.
 835     current_time_stamp.stamp();
 836     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 837     last_time_stamp = current_time_stamp;
 838     globals->inc_sim_time_sec( delta_time_sec );
 839
 840     static const SGPropertyNode *longitude
 841         = fgGetNode("/position/longitude-deg");
 842     static const SGPropertyNode *latitude
 843         = fgGetNode("/position/latitude-deg");
 844     static const SGPropertyNode *altitude
 845         = fgGetNode("/position/altitude-ft");
 846     static const SGPropertyNode *clock_freeze
 847         = fgGetNode("/sim/freeze/clock", true);
 848     static const SGPropertyNode *cur_time_override
 849         = fgGetNode("/sim/time/cur-time-override", true);
 850
 851     static long remainder = 0;
 852     long elapsed;
 853 #ifdef FANCY_FRAME_COUNTER
 854     int i;
 855     double accum;
 856 #else
 857     static time_t last_time = 0;
 858     static int frames = 0;
 859 #endif // FANCY_FRAME_COUNTER
 860
 861     SGTime *t = globals->get_time_params();
 862
 863     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 864     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 865
 866 #ifdef FG_NETWORK_OLK
 867     if ( fgGetBool("/sim/networking/network-olk") ) {
 868         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
 869             // printf("FGD: Netupdate\n");
 870             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
 871             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
 872         }
 873     }
 874 #endif
 875
 876 #if defined( ENABLE_PLIB_JOYSTICK )
 877     // Read joystick and update control settings
 878     // if ( fgGetString("/sim/control-mode") == "joystick" )
 879     // {
 880     //    fgJoystickRead();
 881     // }
 882 #elif defined( ENABLE_GLUT_JOYSTICK )
 883     // Glut joystick support works by feeding a joystick handler
 884     // function to glut.  This is taken care of once in the joystick
 885     // init routine and we don't have to worry about it again.
 886 #endif
 887
 888 #ifdef FG_NEW_ENVIRONMENT
 889     globals->get_environment_mgr()->update(0);  // FIXME: use real delta time
 890 #endif
 891
 892     // Fix elevation.  I'm just sticking this here for now, it should
 893     // probably move eventually
 894
 895     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
 896            scenery.get_cur_elev(),
 897            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 898            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 899
 900     if ( scenery.get_cur_elev() > -9990 && cur_fdm_state->get_inited() ) {
 901         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
 902              (scenery.get_cur_elev() + alt_adjust_m - 3.0) ) {
 903             // now set aircraft altitude above ground
 904             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
 905                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 906                    scenery.get_cur_elev() + alt_adjust_m - 3.0,
 907                    scenery.get_cur_elev() + alt_adjust_m );
 908             cur_fdm_state->set_Altitude( scenery.get_cur_elev()
 909                                                 + alt_adjust_m );
 910
 911             SG_LOG( SG_ALL, SG_DEBUG,
 912                     "<*> resetting altitude to "
 913                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
 914                     << " meters" );
 915         }
 916     }
 917
 918     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
 919            scenery.get_cur_elev(),
 920            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
 921            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
 922
 923     // cout << "Warp = " << globals->get_warp() << endl;
 924
 925     // update "time"
 926     static bool last_clock_freeze = false;
 927
 928     if ( clock_freeze->getBoolValue() ) {
 929         // clock freeze requested
 930         if ( cur_time_override->getLongValue() == 0 ) {
 931             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
 932             globals->set_warp( 0 );
 933         }
 934     } else {
 935         // no clock freeze requested
 936         if ( last_clock_freeze == true ) {
 937             // clock just unfroze, let's set warp as the difference
 938             // between frozen time and current time so we don't get a
 939             // time jump (and corresponding sky object and lighting
 940             // jump.)
 941             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
 942             fgSetLong( "/sim/time/cur-time-override", 0 );
 943         }
 944         if ( globals->get_warp_delta() != 0 ) {
 945             globals->inc_warp( globals->get_warp_delta() );
 946         }
 947     }
 948
 949     last_clock_freeze = clock_freeze->getBoolValue();
 950
 951     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 952                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
 953                cur_time_override->getLongValue(),
 954                globals->get_warp() );
 955
 956     if ( globals->get_warp_delta() != 0 ) {
 957         fgUpdateSkyAndLightingParams();
 958     }
 959
 960     // update magvar model
 961     globals->get_mag()->update( longitude->getDoubleValue()
 962                                   * SGD_DEGREES_TO_RADIANS,
 963                                 latitude->getDoubleValue()
 964                                   * SGD_DEGREES_TO_RADIANS,
 965                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
 966                                 globals->get_time_params()->getJD() );
 967
 968     // Get elapsed time (in usec) for this past frame
 969     elapsed = fgGetTimeInterval();
 970     SG_LOG( SG_ALL, SG_DEBUG,
 971             "Elapsed time interval is = " << elapsed
 972             << ", previous remainder is = " << remainder );
 973
 974     // Calculate frame rate average
 975 #ifdef FANCY_FRAME_COUNTER
 976     /* old fps calculation */
 977     if ( elapsed > 0 ) {
 978         double tmp;
 979         accum = 0.0;
 980         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
 981             tmp = general.get_frame(i);
 982             accum += tmp;
 983             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
 984             general.set_frame(i+1,tmp);
 985         }
 986         tmp = 1000000.0 / (float)elapsed;
 987         general.set_frame(0,tmp);
 988         // printf("frame[0] = %.2f\n", general.frames[0]);
 989         accum += tmp;
 990         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
 991         // printf("ave = %.2f\n", general.frame_rate);
 992     }
 993 #else
 994     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
 995         general.set_frame_rate( frames );
 996         SG_LOG( SG_ALL, SG_DEBUG,
 997                 "--> Frame rate is = " << general.get_frame_rate() );
 998         frames = 0;
 999     }
1000     last_time = t->get_cur_time();
1001     ++frames;
1002 #endif
1003
1004     // Run ATC subsystem
1005     globals->get_ATC_mgr()->update(delta_time_sec);
1006
1007     // Run the AI subsystem
1008     // globals->get_AI_mgr()->update(delta_time_sec);
1009
1010     // Run flight model
1011
1012     // Calculate model iterations needed for next frame
1013     elapsed += remainder;
1014
1015     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1016                               fgGetInt("/sim/model-hz"));
1017     remainder = elapsed - ( (global_multi_loop*1000000) /
1018                             fgGetInt("/sim/model-hz") );
1019     SG_LOG( SG_ALL, SG_DEBUG,
1020             "Model iterations needed = " << global_multi_loop
1021             << ", new remainder = " << remainder );
1022
1023     // chop max interations to something reasonable if the sim was
1024     // delayed for an excesive amount of time
1025     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1026         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1027         remainder = 0;
1028     }
1029
1030     // flight model
1031     if ( global_multi_loop > 0 ) {
1032         fgUpdateTimeDepCalcs();
1033     } else {
1034         SG_LOG( SG_ALL, SG_DEBUG,
1035                 "Elapsed time is zero ... we're zinging" );
1036     }
1037
1038 #if ! defined( macintosh )
1039     // Do any I/O channel work that might need to be done
1040     fgIOProcess();
1041 #endif
1042
1043     // see if we need to load any deferred-load textures
1044     material_lib.load_next_deferred();
1045
1046     // Run audio scheduler
1047 #ifdef ENABLE_AUDIO_SUPPORT
1048     if ( fgGetBool("/sim/sound/audible")
1049            && globals->get_soundmgr()->is_working() ) {
1050         globals->get_fx()->update(1); // FIXME: use dt
1051         globals->get_soundmgr()->update(1); // FIXME: use dt
1052     }
1053 #endif
1054
1055     // redraw display
1056     fgRenderFrame();
1057
1058     // see if we need to load any new scenery tiles
1059     double visibility_meters = fgGetDouble("/environment/visibility-m");
1060     global_tile_mgr.update( longitude->getDoubleValue(),
1061                             latitude->getDoubleValue(), visibility_meters );
1062
1063     SG_LOG( SG_ALL, SG_DEBUG, "" );
1064 }
1065
1066
1067 // This is the top level master main function that is registered as
1068 // our idle funciton
1069
1070 // The first few passes take care of initialization things (a couple
1071 // per pass) and once everything has been initialized fgMainLoop from
1072 // then on.
1073
1074 static void fgIdleFunction ( void ) {
1075     // printf("idle state == %d\n", idle_state);
1076
1077     if ( idle_state == 0 ) {
1078         // Initialize the splash screen right away
1079         if ( fgGetBool("/sim/startup/splash-screen") ) {
1080             fgSplashInit();
1081         }
1082
1083         idle_state++;
1084     } else if ( idle_state == 1 ) {
1085         // Initialize audio support
1086 #ifdef ENABLE_AUDIO_SUPPORT
1087
1088         // Start the intro music
1089         if ( fgGetBool("/sim/startup/intro-music") ) {
1090             SGPath mp3file( globals->get_fg_root() );
1091             mp3file.append( "Sounds/intro.mp3" );
1092
1093             SG_LOG( SG_GENERAL, SG_INFO,
1094                     "Starting intro music: " << mp3file.str() );
1095
1096 #if defined( __CYGWIN__ )
1097             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1098 #elif defined( WIN32 )
1099             string command = "start /m " + mp3file.str();
1100 #else
1101             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1102 #endif
1103
1104             system ( command.c_str() );
1105         }
1106
1107         // This is an 'easter egg' which is kind of a hard thing to
1108         // hide in an open source project -- so I won't try very hard
1109         // to hide it.  If you are looking at this now, please, you
1110         // don't want to ruin the surprise. :-) Just forget about it
1111         // and don't look any further; unless it is causing an actual
1112         // problem for you, which it shouldn't, and I hope it doesn't!
1113         // :-)
1114         if ( globals->get_time_params()->getGmt()->tm_mon == 4
1115              && globals->get_time_params()->getGmt()->tm_mday == 19 )
1116         {
1117             string url = "http://www.flightgear.org/Music/invasion.mp3";
1118 #if defined( __CYGWIN__ ) || defined( WIN32 )
1119             string command = "start /m " + url;
1120 #else
1121             string command = "mpg123 " + url + "> /dev/null 2>&1";
1122 #endif
1123             system( command.c_str() );
1124         }
1125
1126 #endif
1127
1128         idle_state++;
1129     } else if ( idle_state == 2 ) {
1130         // These are a few miscellaneous things that aren't really
1131         // "subsystems" but still need to be initialized.
1132
1133 #ifdef USE_GLIDE
1134         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1135             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1136         }
1137 #endif
1138
1139         idle_state++;
1140     } else if ( idle_state == 3 ) {
1141         // This is the top level init routine which calls all the
1142         // other subsystem initialization routines.  If you are adding
1143         // a subsystem to flightgear, its initialization call should
1144         // located in this routine.
1145         if( !fgInitSubsystems()) {
1146             SG_LOG( SG_GENERAL, SG_ALERT,
1147                     "Subsystem initializations failed ..." );
1148             exit(-1);
1149         }
1150
1151         idle_state++;
1152     } else if ( idle_state == 4 ) {
1153         // setup OpenGL view parameters
1154         fgInitVisuals();
1155
1156         idle_state++;
1157     } else if ( idle_state == 5 ) {
1158
1159         idle_state++;
1160     } else if ( idle_state == 6 ) {
1161         // sleep(1);
1162         idle_state = 1000;
1163
1164         cout << "Panel visible = " << fgPanelVisible() << endl;
1165         fgReshape( fgGetInt("/sim/startup/xsize"),
1166                    fgGetInt("/sim/startup/ysize") );
1167     }
1168
1169     if ( idle_state == 1000 ) {
1170         // We've finished all our initialization steps, from now on we
1171         // run the main loop.
1172
1173         glutIdleFunc(fgMainLoop);
1174     } else {
1175         if ( fgGetBool("/sim/startup/splash-screen") ) {
1176             fgSplashUpdate(0.0);
1177         }
1178     }
1179 }
1180
1181 // options.cxx needs to see this for toggle_panel()
1182 // Handle new window size or exposure
1183 void fgReshape( int width, int height ) {
1184     int view_h;
1185
1186     if ( (!fgGetBool("/sim/virtual-cockpit"))
1187          && fgPanelVisible() && idle_state == 1000 ) {
1188         view_h = (int)(height * (current_panel->getViewHeight() -
1189                                  current_panel->getYOffset()) / 768.0);
1190     } else {
1191         view_h = height;
1192     }
1193
1194     // for all views
1195     FGViewMgr *viewmgr = globals->get_viewmgr();
1196     for ( int i = 0; i < viewmgr->size(); ++i ) {
1197       viewmgr->get_view(i)->
1198         set_aspect_ratio((float)view_h / (float)width);
1199     }
1200
1201     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1202
1203     fgSetInt("/sim/startup/xsize", width);
1204     fgSetInt("/sim/startup/ysize", height);
1205     guiInitMouse(width, height);
1206
1207     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1208                viewmgr->get_current_view()->get_v_fov() );
1209
1210     fgHUDReshape();
1211 }
1212
1213 // Initialize GLUT and define a main window
1214 int fgGlutInit( int *argc, char **argv ) {
1215
1216 #if !defined( macintosh )
1217     // GLUT will extract all glut specific options so later on we only
1218     // need wory about our own.
1219     glutInit(argc, argv);
1220 #endif
1221
1222     // Define Display Parameters
1223     glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1224
1225     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1226             fgGetInt("/sim/startup/xsize") << "x"
1227             << fgGetInt("/sim/startup/ysize") );
1228
1229     // Define initial window size
1230     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1231                         fgGetInt("/sim/startup/ysize") );
1232
1233     // Initialize windows
1234     if ( !fgGetBool("/sim/startup/game-mode")) {
1235         // Open the regular window
1236         glutCreateWindow("FlightGear");
1237 #ifndef GLUT_WRONG_VERSION
1238     } else {
1239         // Open the cool new 'game mode' window
1240         char game_mode_str[256];
1241 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1242 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1243 #ifndef ENUM_CURRENT_SETTINGS
1244 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1245 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1246 #endif
1247
1248         DEVMODE dm;
1249         dm.dmSize = sizeof(DEVMODE);
1250         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1251         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1252         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1253         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1254                                                 fgGetInt("/sim/startup/ysize") );
1255         sprintf( game_mode_str, "%dx%d:%d@%d",
1256                          dm.dmPelsWidth,
1257                          dm.dmPelsHeight,
1258                          dm.dmBitsPerPel,
1259                          dm.dmDisplayFrequency );
1260 #else
1261         // Open the cool new 'game mode' window
1262         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1263                  fgGetInt("/sim/startup/xsize"),
1264                  fgGetInt("/sim/startup/ysize"),
1265                  fgGetInt("/sim/rendering/bits-per-pixel"));
1266
1267 #endif // HAVE_WINDOWS_H
1268         SG_LOG( SG_GENERAL, SG_INFO,
1269                 "game mode params = " << game_mode_str );
1270         glutGameModeString( game_mode_str );
1271         glutEnterGameMode();
1272 #endif // GLUT_WRONG_VERSION
1273     }
1274
1275     // This seems to be the absolute earliest in the init sequence
1276     // that these calls will return valid info.  Too bad it's after
1277     // we've already created and sized out window. :-(
1278     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1279     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1280     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1281     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1282
1283     GLint tmp;
1284     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1285     general.set_glMaxTexSize( tmp );
1286     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1287
1288     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1289     general.set_glDepthBits( tmp );
1290     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1291
1292     return 1;
1293 }
1294
1295
1296 // Initialize GLUT event handlers
1297 int fgGlutInitEvents( void ) {
1298     // call fgReshape() on window resizes
1299     glutReshapeFunc( fgReshape );
1300
1301     // keyboard and mouse callbacks are set in FGInput::init
1302
1303 #ifdef FG_OLD_MOUSE
1304     // call guiMouseFunc() whenever our little rodent is used
1305     glutMouseFunc ( guiMouseFunc );
1306     glutMotionFunc (guiMotionFunc );
1307     glutPassiveMotionFunc (guiMotionFunc );
1308 #endif
1309
1310     // call fgMainLoop() whenever there is
1311     // nothing else to do
1312     glutIdleFunc( fgIdleFunction );
1313
1314     // draw the scene
1315     glutDisplayFunc( fgRenderFrame );
1316
1317     return 1;
1318 }
1319
1320
1321 // Main loop
1322 int mainLoop( int argc, char **argv ) {
1323
1324 #if defined( macintosh )
1325     freopen ("stdout.txt", "w", stdout );
1326     freopen ("stderr.txt", "w", stderr );
1327     argc = ccommand( &argv );
1328 #endif
1329
1330     // set default log levels
1331      sglog().setLogLevels( SG_ALL, SG_INFO );
1332
1333     string version;
1334 #ifdef FLIGHTGEAR_VERSION
1335     version = FLIGHTGEAR_VERSION;
1336 #else
1337     version = "unknown version";
1338 #endif
1339     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1340             << version << endl );
1341
1342     // Allocate global data structures.  This needs to happen before
1343     // we parse command line options
1344
1345     globals = new FGGlobals;
1346
1347 #if defined(FG_NEW_ENVIRONMENT)
1348     globals->set_environment_mgr(new FGEnvironmentMgr);
1349 #endif
1350
1351     // seed the random number generater
1352     sg_srandom_time();
1353
1354     SGRoute *route = new SGRoute;
1355     globals->set_route( route );
1356
1357     FGControls *controls = new FGControls;
1358     globals->set_controls( controls );
1359
1360     string_list *col = new string_list;
1361     globals->set_channel_options_list( col );
1362
1363     // Scan the config file(s) and command line options to see if
1364     // fg_root was specified (ignore all other options for now)
1365     fgInitFGRoot(argc, argv);
1366
1367     // Check for the correct base package version
1368     string base_version = fgBasePackageVersion();
1369     if ( !(base_version == "0.7.9") ) {
1370         // tell the operator how to use this application
1371         fgUsage();
1372
1373         SG_LOG( SG_GENERAL, SG_ALERT, "Base package check failed ... "
1374                 << "Found version " << base_version << " at: "
1375                 << globals->get_fg_root() );
1376         SG_LOG( SG_GENERAL, SG_ALERT, "Please upgrade to version 0.7.9" );
1377         exit(-1);
1378     }
1379
1380     // Initialize the Aircraft directory to "" (UIUC)
1381     aircraft_dir = "";
1382
1383     // Load the configuration parameters
1384     if ( !fgInitConfig(argc, argv) ) {
1385         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1386         exit(-1);
1387     }
1388
1389     // Initialize the Window/Graphics environment.
1390     if( !fgGlutInit(&argc, argv) ) {
1391         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1392         exit(-1);
1393     }
1394
1395     // Initialize the various GLUT Event Handlers.
1396     if( !fgGlutInitEvents() ) {
1397         SG_LOG( SG_GENERAL, SG_ALERT,
1398                 "GLUT event handler initialization failed ..." );
1399         exit(-1);
1400     }
1401
1402     // Initialize plib net interface
1403     netInit( &argc, argv );
1404
1405     // Initialize ssg (from plib).  Needs to come before we do any
1406     // other ssg stuff, but after opengl/glut has been initialized.
1407     ssgInit();
1408
1409     // Initialize the user interface (we need to do this before
1410     // passing off control to glut and before fgInitGeneral to get our
1411     // fonts !!!
1412     guiInit();
1413
1414 #ifdef GL_EXT_texture_lod_bias
1415     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1416 #endif
1417
1418     // Set position relative to glide slope if requested
1419     fgSetPosFromGlideSlope();
1420
1421     // If we have an explicit, in-range lon/lat, use it.
1422     // If not, check for an airport-id and use that.
1423     // If not, default to the middle of the KSFO field.
1424     // The default values for lon/lat are deliberately out of range
1425     // so that the airport-id can take effect; valid lon/lat will
1426     // override airport-id, however.
1427     double lon_deg = fgGetDouble("/position/longitude-deg");
1428     double lat_deg = fgGetDouble("/position/latitude-deg");
1429     if (lon_deg < -180 || lon_deg > 180 || lat_deg < -90 || lat_deg > 90) {
1430       if ( fgGetString("/sim/startup/airport-id")[0] != '\0' ) {
1431         fgSetPosFromAirportIDandHdg( fgGetString("/sim/startup/airport-id"),
1432                                      fgGetDouble("/orientation/heading-deg") );
1433         // set tower position (a little off the heading for single
1434         // runway airports)
1435         fgSetTowerPosFromAirportID( fgGetString("/sim/startup/airport-id"),
1436                                     fgGetDouble("orientation/heading") );
1437       } else {
1438                                 // Default to middle of KSFO field
1439         fgSetDouble("/position/longitude-deg", -122.374843);
1440         fgSetDouble("/position/latitude-deg", 37.619002);
1441       }
1442     }
1443
1444     SGTime *t = fgInitTime();
1445     globals->set_time_params( t );
1446
1447     // Do some quick general initializations
1448     if( !fgInitGeneral()) {
1449         SG_LOG( SG_GENERAL, SG_ALERT,
1450                 "General initializations failed ..." );
1451         exit(-1);
1452     }
1453
1454     SGPath modelpath( globals->get_fg_root() );
1455     ssgModelPath( (char *)modelpath.c_str() );
1456
1457     // Scene graph root
1458     globals->set_scene_graph(new ssgRoot);
1459     globals->get_scene_graph()->setName( "Scene" );
1460
1461     lighting = new ssgRoot;
1462     lighting->setName( "Lighting" );
1463
1464     // Terrain branch
1465     globals->set_terrain_branch(new ssgBranch);
1466     globals->get_terrain_branch()->setName( "Terrain" );
1467     globals->get_scene_graph()->addKid( globals->get_terrain_branch() );
1468
1469     globals->set_models_branch(new ssgBranch);
1470     globals->get_models_branch()->setName( "Models" );
1471     globals->get_scene_graph()->addKid( globals->get_models_branch() );
1472
1473     globals->set_aircraft_branch(new ssgBranch);
1474     globals->get_aircraft_branch()->setName( "Aircraft" );
1475     globals->get_scene_graph()->addKid( globals->get_aircraft_branch() );
1476
1477     // Lighting
1478     globals->set_gnd_lights_branch(new ssgBranch);
1479     globals->get_gnd_lights_branch()->setName( "Ground Lighting" );
1480     lighting->addKid( globals->get_gnd_lights_branch() );
1481
1482     globals->set_rwy_lights_branch(new ssgBranch);
1483     globals->get_rwy_lights_branch()->setName( "Runway Lighting" );
1484     lighting->addKid( globals->get_rwy_lights_branch() );
1485
1486     ////////////////////////////////////////////////////////////////////
1487     // Initialize the general model subsystem.
1488     ////////////////////////////////////////////////////////////////////
1489
1490     globals->set_model_mgr(new FGModelMgr);
1491     globals->get_model_mgr()->init();
1492     globals->get_model_mgr()->bind();
1493
1494     ////////////////////////////////////////////////////////////////////
1495     // Initialize the 3D aircraft model subsystem.
1496     ////////////////////////////////////////////////////////////////////
1497
1498     globals->set_aircraft_model(new FGAircraftModel);
1499     globals->get_aircraft_model()->init();
1500     globals->get_aircraft_model()->bind();
1501
1502     ////////////////////////////////////////////////////////////////////
1503     // Initialize the view manager subsystem.
1504     ////////////////////////////////////////////////////////////////////
1505
1506     FGViewMgr *viewmgr = new FGViewMgr;
1507     globals->set_viewmgr( viewmgr );
1508     viewmgr->init();
1509     viewmgr->bind();
1510
1511
1512     // Initialize the sky
1513     SGPath ephem_data_path( globals->get_fg_root() );
1514     ephem_data_path.append( "Astro" );
1515     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1516     ephem->update( globals->get_time_params()->getMjd(),
1517                    globals->get_time_params()->getLst(),
1518                    0.0 );
1519     globals->set_ephem( ephem );
1520
1521     thesky = new SGSky;
1522
1523     SGPath sky_tex_path( globals->get_fg_root() );
1524     sky_tex_path.append( "Textures" );
1525     sky_tex_path.append( "Sky" );
1526     thesky->texture_path( sky_tex_path.str() );
1527
1528     thesky->build( 550.0, 550.0,
1529                    globals->get_ephem()->getNumPlanets(),
1530                    globals->get_ephem()->getPlanets(), 60000.0,
1531                    globals->get_ephem()->getNumStars(),
1532                    globals->get_ephem()->getStars(), 60000.0 );
1533
1534     if ( fgGetBool("/environment/clouds/status") ) {
1535         // thesky->add_cloud_layer( 2000.0, 200.0, 50.0, 40000.0,
1536         //                          SG_CLOUD_OVERCAST );
1537         thesky->add_cloud_layer( fgGetDouble("/environment/clouds/altitude-ft") *
1538                                  SG_FEET_TO_METER,
1539                                  200.0, 50.0, 40000.0,
1540                                  SG_CLOUD_MOSTLY_CLOUDY );
1541         // thesky->add_cloud_layer( 3000.0, 200.0, 50.0, 40000.0,
1542         //                          SG_CLOUD_MOSTLY_SUNNY );
1543         thesky->add_cloud_layer( 6000.0, 20.0, 10.0, 40000.0,
1544                                  SG_CLOUD_CIRRUS );
1545     }
1546
1547     // Initialize MagVar model
1548     SGMagVar *magvar = new SGMagVar();
1549     globals->set_mag( magvar );
1550
1551     // airport = new ssgBranch;
1552     // airport->setName( "Airport Lighting" );
1553     // lighting->addKid( airport );
1554
1555     // ADA
1556     fgLoadDCS();
1557     // ADA
1558
1559 #ifdef FG_NETWORK_OLK
1560     // Do the network intialization
1561     if ( fgGetBool("/sim/networking/network-olk") ) {
1562         printf("Multipilot mode %s\n",
1563                fg_net_init( globals->get_scene_graph() ) );
1564     }
1565 #endif
1566
1567     // build our custom render states
1568     fgBuildRenderStates();
1569
1570     // pass control off to the master GLUT event handler
1571     glutMainLoop();
1572
1573     // we never actually get here ... but to avoid compiler warnings,
1574     // etc.
1575     return 0;
1576 }
1577
1578
1579 // $$$ end - added VS Renganathan, 15 Oct 2K
1580 //         - added Venky         , 12 Nov 2K
1581
1582 #if defined(__linux__) && defined(__i386__)
1583
1584 static void handleFPE (int);
1585
1586 static void
1587 initFPE ()
1588 {
1589     fpu_control_t fpe_flags = 0;
1590     _FPU_GETCW(fpe_flags);
1591 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1592 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1593 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1594 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1595 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1596 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1597     _FPU_SETCW(fpe_flags);
1598     signal(SIGFPE, handleFPE);
1599 }
1600
1601 static void
1602 handleFPE (int num)
1603 {
1604   initFPE();
1605   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1606 }
1607 #endif
1608
1609 // Main entry point; catch any exceptions that have made it this far.
1610 int main ( int argc, char **argv ) {
1611
1612     // Enable floating-point exceptions for Linux/x86
1613 #if defined(__linux__) && defined(__i386__)
1614     initFPE();
1615 #endif
1616
1617     // Enable floating-point exceptions for Windows
1618 #if defined( _MSC_VER ) && defined( DEBUG )
1619     // Christian, we should document what this does
1620     _control87( _EM_INEXACT, _MCW_EM );
1621 #endif
1622
1623 #if defined( HAVE_BC5PLUS )
1624     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1625 #endif
1626
1627     // FIXME: add other, more specific
1628     // exceptions.
1629     try {
1630         mainLoop(argc, argv);
1631     } catch (sg_throwable &t) {
1632                                 // We must use cerr rather than
1633                                 // logging, since logging may be
1634                                 // disabled.
1635         cerr << "Fatal error: " << t.getFormattedMessage()
1636              << "\n (received from " << t.getOrigin() << ')' << endl;
1637         exit(1);
1638     }
1639
1640     return 0;
1641 }
1642
1643
1644 void fgLoadDCS(void) {
1645
1646     ssgEntity *ship_obj = NULL;
1647
1648     char obj_filename[25];
1649
1650     for ( int k = 0; k < 32; k++ ) {
1651         ship_pos[k]=NULL;
1652     }
1653
1654     SGPath tile_path( globals->get_fg_root());
1655     tile_path.append( "Scenery" );
1656     tile_path.append( "Objects.txt" );
1657     sg_gzifstream in( tile_path.str() );
1658     if ( ! in.is_open() ) {
1659         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1660     } else {
1661
1662         SGPath modelpath( globals->get_fg_root() );
1663         modelpath.append( "Models" );
1664         modelpath.append( "Geometry" );
1665
1666         SGPath texturepath( globals->get_fg_root() );
1667         texturepath.append( "Models" );
1668         texturepath.append( "Textures" );
1669
1670         ssgModelPath( (char *)modelpath.c_str() );
1671         ssgTexturePath( (char *)texturepath.c_str() );
1672
1673         ship_sel = new ssgSelector;
1674
1675         char c;
1676         while ( ! in.eof() ) {
1677             in >> ::skipws;
1678             if ( in.get( c ) && c == '#' ) {
1679                 in >> skipeol;
1680             } else {
1681                 in.putback(c);
1682                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1683                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1684                    int chj=getchar();*/
1685
1686                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1687                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1688
1689                 ship_pos[objc] = new ssgTransform;
1690
1691                 // type "repeat" in objects.txt to load one more
1692                 // instance of the last object.
1693
1694                 if ( strcmp(obj_filename,"repeat") != 0) {
1695                     ship_obj = ssgLoad( obj_filename );
1696                 }
1697
1698                 if ( ship_obj != NULL ) {
1699                                         ship_obj->setName(obj_filename);
1700                                 if (objc == 0)
1701                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1702                                         else
1703                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1704                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1705                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1706                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1707                             << obj_filename );
1708                 } else {
1709                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1710                             << obj_filename );
1711                 }
1712
1713                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1714                                 //const char *extn = file_extension ( obj_filename ) ;
1715                                 if ( objc == 1 ){
1716                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1717                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1718                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1719                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1720                                         int ltype[500], light_type;
1721                                         static int ltcount = 0;
1722                                     string token;
1723                                         sgVec3 rway_dir,rway_normal,lightpt;
1724                                         Point3D node;
1725                                         modelpath.append(obj_filename);
1726                                         sg_gzifstream in1( modelpath.str() );
1727                                         if ( ! in1.is_open() ) {
1728                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1729                                         } else {
1730                                                 while ( ! in1.eof() ) {
1731                                                         in1 >> ::skipws;
1732                                                         if ( in1.get( c ) && c == '#' ) {
1733                                                                 in1 >> skipeol;
1734                                                         } else {
1735                                                                 in1.putback(c);
1736                                                                 in1 >> token;
1737                                                                 //cout << token << endl;
1738                                                                 if ( token == "runway" ) {
1739                                                                         in1 >> node;
1740                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1741                                                                 } else if ( token == "edgelight" ) {
1742                                                                         in1 >> node;
1743                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1744                                                                         light_type = 1;
1745                                                                 } else if ( token == "taxi" ) {
1746                                                                         in1 >> node;
1747                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1748                                                                         light_type = 2;
1749                                                                 } else if ( token == "vasi" ) {
1750                                                                         in1 >> node;
1751                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1752                                                                         light_type = 3;
1753                                                                 } else if ( token == "threshold" ) {
1754                                                                         in1 >> node;
1755                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1756                                                                         light_type = 4;
1757                                                                 } else if ( token == "rabbit" ) {
1758                                                                         in1 >> node;
1759                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1760                                                                         light_type = 5;
1761                                                                 } else if ( token == "ols" ) {
1762                                                                         in1 >> node;
1763                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1764                                                                         light_type = 6;
1765                                                                 } else if ( token == "red" ) {
1766                                                                         in1 >> node;
1767                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1768                                                                         light_type = 7;
1769                                                                 } else if ( token == "green" ) {
1770                                                                         in1 >> node;
1771                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1772                                                                         light_type = 8;
1773                                                                 } else if ( token == "lp" ) {
1774                                                                         in1 >> node;
1775                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1776                                                                         lightpoints->add( lightpt );
1777                                                                         lightnormals->add( rway_normal );
1778                                                                         lightdir->add( rway_dir );
1779                                                                         ltype[ltcount]= light_type;
1780                                                                         ltcount++;
1781                                                                 }
1782                                                                 if (in1.eof()) break;
1783                                                         }
1784                                                 }  //while
1785
1786                                                 if ( lightpoints->getNum() ) {
1787                                                         ssgBranch *lightpoints_branch;
1788                                                         long int dummy = -999;
1789                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1790                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1791                                                         dummy_tile->ols_transform = new ssgTransform;
1792
1793                                                         // call function to generate the runway lights
1794                                                         lightpoints_branch =
1795                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1796                                                                                                                                 lightdir, ltype);
1797                                                         lightpoints_brightness->addKid(lightpoints_branch);
1798                                                         lightpoints_transform->addKid(lightpoints_brightness);
1799                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1800                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1801                                                         lightpoints_transform->ref();
1802                                                         globals->get_gnd_lights_branch()->addKid( lightpoints_transform );
1803                                                 }
1804                                         } //if in1
1805                 } //if objc
1806                                 // end hack for deck lights
1807
1808                 objc++;
1809
1810                 if (in.eof()) break;
1811             }
1812         } // while
1813
1814         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
1815
1816         globals->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
1817     }
1818
1819     return;
1820  }
1821
1822
1823 void fgUpdateDCS (void) {
1824
1825     // double eye_lat,eye_lon,eye_alt;
1826     // static double obj_head;
1827     double sl_radius,obj_latgc;
1828     // float nresultmat[4][4];
1829     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
1830     double bz[3];
1831
1832     // Instantaneous Geodetic Lat/Lon/Alt of moving object
1833     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
1834
1835     // Deck should be the first object in objects.txt in case of fdm=ada
1836
1837     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
1838                 if ((fdm->get_iaux(1))==1)
1839                 {
1840                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
1841                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
1842                         obj_alt[1] = fdm->get_daux(3);
1843                         obj_pitch[1] = fdm->get_faux(1);
1844                         obj_roll[1] = fdm->get_faux(2);
1845                 }
1846     }
1847
1848     for ( int m = 0; m < objc; m++ ) {
1849         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
1850         //int v=getchar();
1851
1852         //Geodetic to Geocentric angles for rotation
1853         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
1854
1855         //moving object gbs-posn in cartesian coords
1856         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
1857         Point3D obj_pos = sgGeodToCart( obj_posn );
1858
1859         // Translate moving object w.r.t eye
1860         Point3D Objtrans = obj_pos-scenery.get_center();
1861         bz[0]=Objtrans.x();
1862         bz[1]=Objtrans.y();
1863         bz[2]=Objtrans.z();
1864
1865        // rotate dynamic objects for lat,lon & alt and other motion about its axes
1866
1867         sgMat4 sgTRANS;
1868         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
1869
1870         sgVec3 ship_fwd,ship_rt,ship_up;
1871         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
1872         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
1873         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
1874
1875         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
1876         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
1877         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
1878         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
1879         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
1880         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
1881
1882         sgMat4 sgTUX;
1883         sgCopyMat4( sgTUX, sgROT_hdg );
1884         sgPostMultMat4( sgTUX, sgROT_pitch );
1885         sgPostMultMat4( sgTUX, sgROT_roll );
1886         sgPostMultMat4( sgTUX, sgROT_lat );
1887         sgPostMultMat4( sgTUX, sgROT_lon );
1888         sgPostMultMat4( sgTUX, sgTRANS );
1889
1890         sgCoord shippos;
1891         sgSetCoord(&shippos, sgTUX );
1892         ship_pos[m]->setTransform( &shippos );
1893         // temporary hack for deck lights - ultimately should move to PLib (when ??)
1894         if (m == 1) {
1895                 if (lightpoints_transform) {
1896                         lightpoints_transform->setTransform( &shippos );
1897                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
1898                         if ( sun_angle > 89 ) {
1899                                 lightpoints_brightness->select(0x01);
1900                         } else {
1901                                 lightpoints_brightness->select(0x00);
1902                         }
1903                 }
1904
1905                 float elev;
1906                 sgVec3 rp,to;
1907                 float *vp;
1908                 float alt;
1909                 float ref_elev;
1910                 sgXformPnt3( rp, rway_ols, sgTUX );
1911                 vp = globals->get_current_view()->get_view_pos();
1912             to[0] = rp[0]-vp[0];
1913             to[1] = rp[1]-vp[1];
1914             to[2] = rp[2]-vp[2];
1915                 float dist = sgLengthVec3( to );
1916                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
1917
1918                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
1919
1920             ref_elev = elev - 3.75; // +ve above, -ve below
1921
1922                 unsigned int sel;
1923                 sel = 0xFF;
1924 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1925 //              if (ref_elev > 0.51) sel = 0x21;
1926 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
1927 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
1928 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
1929 //              if (ref_elev < -0.51) sel = 0x30;
1930 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
1931                 dummy_tile->lightmaps_sequence->select(sel);
1932
1933                 sgVec3 up;
1934                 sgCopyVec3 (up, ship_up);
1935                 if (dist > 750)
1936                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
1937                 else
1938                         sgScaleVec3 (up, 4.0*ref_elev);
1939                 dummy_tile->ols_transform->setTransform(up);
1940                 //cout << "ref_elev  " << ref_elev << endl;
1941         }
1942     // end hack for deck lights
1943
1944     }
1945     if ( ship_sel != NULL ) {
1946         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
1947     }
1948 }
1949
1950 // $$$ end - added VS Renganathan, 15 Oct 2K
1951 //           added Venky         , 12 Nov 2K