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 SG_USING_STD(cerr);
  37 SG_USING_STD(endl);
  38
  39 #include <simgear/misc/exception.hxx>
  40 #include <simgear/ephemeris/ephemeris.hxx>
  41 #include <simgear/route/route.hxx>
  42
  43 #ifdef SG_MATH_EXCEPTION_CLASH
  44 #  include <math.h>
  45 #endif
  46
  47 #ifdef HAVE_WINDOWS_H
  48 #  include <windows.h>
  49 #  include <float.h>
  50 #endif
  51
  52 #include GLUT_H
  53
  54 #include <stdio.h>
  55 #include <string.h>             // for strcmp()
  56 #include <string>
  57
  58 #ifdef HAVE_STDLIB_H
  59 #   include <stdlib.h>
  60 #endif
  61
  62 #ifdef HAVE_SYS_STAT_H
  63 #  include <sys/stat.h>         // for stat()
  64 #endif
  65
  66 #ifdef HAVE_UNISTD_H
  67 #  include <unistd.h>           // for stat()
  68 #endif
  69
  70 #include <plib/netChat.h>
  71 #include <plib/pu.h>
  72 #include <plib/sg.h>
  73 #include <plib/ssg.h>
  74
  75 #include <simgear/constants.h>  // for VERSION
  76 #include <simgear/debug/logstream.hxx>
  77 #include <simgear/math/polar3d.hxx>
  78 #include <simgear/math/sg_random.h>
  79 #include <simgear/misc/sg_path.hxx>
  80 #ifdef FG_USE_CLOUDS_3D
  81 #  include <simgear/sky/clouds3d/SkySceneLoader.hpp>
  82 #  include <simgear/sky/clouds3d/SkyUtil.hpp>
  83 #endif
  84 #include <simgear/sky/sky.hxx>
  85 #include <simgear/timing/sg_time.hxx>
  86
  87 #include <Include/general.hxx>
  88
  89 #include <Aircraft/aircraft.hxx>
  90
  91 #include <ATC/ATCmgr.hxx>
  92 #include <ATC/ATCdisplay.hxx>
  93 #include <ATC/AIMgr.hxx>
  94
  95
  96 #include <Autopilot/newauto.hxx>
  97
  98 #include <Cockpit/cockpit.hxx>
  99 #include <Cockpit/radiostack.hxx>
 100
 101 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 102 #include <GUI/gui.h>
 103 #include <Model/acmodel.hxx>
 104 #include <Model/loader.hxx>
 105 #include <Model/model.hxx>
 106 #include <Model/modelmgr.hxx>
 107 #include <Main/location.hxx>
 108 #include <Model/panelnode.hxx>
 109 #ifdef FG_NETWORK_OLK
 110 #include <NetworkOLK/network.h>
 111 #endif
 112
 113 #ifdef FG_MPLAYER_AS
 114 #include <MultiPlayer/multiplaytxmgr.hxx>
 115 #include <MultiPlayer/multiplayrxmgr.hxx>
 116 #endif
 117
 118 #include <Objects/matlib.hxx>
 119 #include <Scenery/scenery.hxx>
 120 #include <Scenery/tilemgr.hxx>
 121 #ifdef ENABLE_AUDIO_SUPPORT
 122 #  include <Sound/soundmgr.hxx>
 123 #  include <Sound/fg_fx.hxx>
 124 #  include <Sound/morse.hxx>
 125 #endif
 126 #include <Systems/system_mgr.hxx>
 127 #include <Instrumentation/instrument_mgr.hxx>
 128 #include <Time/FGEventMgr.hxx>
 129 #include <Time/fg_timer.hxx>
 130 #include <Time/light.hxx>
 131 #include <Time/sunpos.hxx>
 132 #include <Time/tmp.hxx>
 133
 134 // ADA
 135 #include <simgear/misc/sgstream.hxx>
 136 #include <simgear/math/point3d.hxx>
 137 #include <FDM/flight.hxx>
 138 #include <FDM/ADA.hxx>
 139 #include <Scenery/tileentry.hxx>
 140
 141 #include "fg_commands.hxx"
 142
 143 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 144 #ifdef WIN32
 145   typedef void (APIENTRY * PFNGLPOINTPARAMETERFEXTPROC)(GLenum pname,
 146                                                         GLfloat param);
 147   typedef void (APIENTRY * PFNGLPOINTPARAMETERFVEXTPROC)(GLenum pname,
 148                                                          const GLfloat *params);
 149
 150   PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 151   PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 152 #elif linux
 153   #include <GL/glx.h>
 154
 155   typedef void (* OpenGLFuncExt)(GLenum pname, GLfloat param);
 156   typedef void (* OpenGLFuncExtv)(GLenum pname, const GLfloat *params);
 157
 158   OpenGLFuncExt glPointParameterfEXT = 0;
 159   OpenGLFuncExtv glPointParameterfvEXT = 0;
 160 #endif
 161 #endif
 162
 163 float default_attenuation[3] = {1.0, 0.0, 0.0};
 164 //Required for using GL_extensions
 165 void fgLoadDCS (void);
 166 void fgUpdateDCS (void);
 167 ssgSelector *ship_sel=NULL;
 168 // upto 32 instances of a same object can be loaded.
 169 ssgTransform *ship_pos[32];
 170 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 171 int objc=0;
 172 ssgSelector *lightpoints_brightness = new ssgSelector;
 173 ssgTransform *lightpoints_transform = new ssgTransform;
 174 FGTileEntry *dummy_tile;
 175 sgVec3 rway_ols;
 176 // ADA
 177 // Clip plane settings...
 178 float scene_nearplane = 0.5f;
 179 float scene_farplane = 120000.0f;
 180
 181 static double delta_time_sec = 0;
 182
 183
 184 #ifdef FG_WEATHERCM
 185 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 186 #else
 187 #  include <Environment/environment_mgr.hxx>
 188 #endif
 189
 190 #include "version.h"
 191
 192 #include "fg_init.hxx"
 193 #include "fg_io.hxx"
 194 #include "fg_props.hxx"
 195 #include "globals.hxx"
 196 #include "splash.hxx"
 197 #include "viewmgr.hxx"
 198 #include "options.hxx"
 199 #include "logger.hxx"
 200
 201 #ifdef macintosh
 202 #  include <console.h>          // -dw- for command line dialog
 203 #endif
 204
 205
 206 FGEventMgr global_events;
 207
 208 // This is a record containing a bit of global housekeeping information
 209 FGGeneral general;
 210
 211 // Specify our current idle function state.  This is used to run all
 212 // our initializations out of the glutIdleLoop() so that we can get a
 213 // splash screen up and running right away.
 214 static int idle_state = 0;
 215 static long global_multi_loop;
 216
 217 // forward declaration
 218 void fgReshape( int width, int height );
 219
 220 // fog constants.  I'm a little nervous about putting actual code out
 221 // here but it seems to work (?)
 222 static const double m_log01 = -log( 0.01 );
 223 static const double sqrt_m_log01 = sqrt( m_log01 );
 224 static GLfloat fog_exp_density;
 225 static GLfloat fog_exp2_density;
 226 static GLfloat rwy_exp2_punch_through;
 227 static GLfloat taxi_exp2_punch_through;
 228 static GLfloat ground_exp2_punch_through;
 229
 230 #ifdef FG_NETWORK_OLK
 231 ssgSelector *fgd_sel = NULL;
 232 ssgTransform *fgd_pos = NULL;
 233 #endif
 234
 235 // Sky structures
 236 SGSky *thesky;
 237
 238 #ifdef FG_USE_CLOUDS_3D
 239   SkySceneLoader *sgClouds3d;
 240   bool _bcloud_orig = true;
 241 #endif
 242
 243 // hack
 244 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 245 {
 246   {  1.0f,  0.0f,  0.0f,  0.0f },
 247   {  0.0f,  0.0f, -1.0f,  0.0f },
 248   {  0.0f,  1.0f,  0.0f,  0.0f },
 249   {  0.0f,  0.0f,  0.0f,  1.0f }
 250 };
 251
 252 // The following defines flightgear options. Because glutlib will also
 253 // want to parse its own options, those options must not be included here
 254 // or they will get parsed by the main program option parser. Hence case
 255 // is significant for any option added that might be in conflict with
 256 // glutlib's parser.
 257 //
 258 // glutlib parses for:
 259 //    -display
 260 //    -direct   (invalid in Win32)
 261 //    -geometry
 262 //    -gldebug
 263 //    -iconized
 264 //    -indirect (invalid in Win32)
 265 //    -synce
 266 //
 267 // Note that glutlib depends upon strings while this program's
 268 // option parser wants only initial characters followed by numbers
 269 // or pathnames.
 270 //
 271
 272
 273 ssgSimpleState *cloud3d_imposter_state;
 274 ssgSimpleState *default_state;
 275 ssgSimpleState *hud_and_panel;
 276 ssgSimpleState *menus;
 277
 278 SGTimeStamp last_time_stamp;
 279 SGTimeStamp current_time_stamp;
 280
 281 void fgBuildRenderStates( void ) {
 282     default_state = new ssgSimpleState;
 283     default_state->ref();
 284     default_state->disable( GL_TEXTURE_2D );
 285     default_state->enable( GL_CULL_FACE );
 286     default_state->enable( GL_COLOR_MATERIAL );
 287     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 288     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 289     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 290     default_state->disable( GL_BLEND );
 291     default_state->disable( GL_ALPHA_TEST );
 292     default_state->disable( GL_LIGHTING );
 293
 294     cloud3d_imposter_state = new ssgSimpleState;
 295     cloud3d_imposter_state->ref();
 296     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 297     cloud3d_imposter_state->enable( GL_CULL_FACE );
 298     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 299     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 300     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 301     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 302     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 303     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 304     cloud3d_imposter_state->enable( GL_BLEND );
 305     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 306     cloud3d_imposter_state->disable( GL_LIGHTING );
 307
 308     hud_and_panel = new ssgSimpleState;
 309     hud_and_panel->ref();
 310     hud_and_panel->disable( GL_CULL_FACE );
 311     hud_and_panel->disable( GL_TEXTURE_2D );
 312     hud_and_panel->disable( GL_LIGHTING );
 313     hud_and_panel->enable( GL_BLEND );
 314
 315     menus = new ssgSimpleState;
 316     menus->ref();
 317     menus->disable( GL_CULL_FACE );
 318     menus->disable( GL_TEXTURE_2D );
 319     menus->enable( GL_BLEND );
 320 }
 321
 322
 323 // fgInitVisuals() -- Initialize various GL/view parameters
 324 void fgInitVisuals( void ) {
 325     fgLIGHT *l;
 326
 327     l = &cur_light_params;
 328
 329 #ifndef GLUT_WRONG_VERSION
 330     // Go full screen if requested ...
 331     if ( fgGetBool("/sim/startup/fullscreen") ) {
 332         glutFullScreen();
 333     }
 334 #endif
 335
 336     // If enabled, normal vectors specified with glNormal are scaled
 337     // to unit length after transformation.  Enabling this has
 338     // performance implications.  See the docs for glNormal.
 339     // glEnable( GL_NORMALIZE );
 340
 341     glEnable( GL_LIGHTING );
 342     glEnable( GL_LIGHT0 );
 343     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 344
 345     sgVec3 sunpos;
 346     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 347     ssgGetLight( 0 ) -> setPosition( sunpos );
 348
 349     glFogi (GL_FOG_MODE, GL_EXP2);
 350     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 351          (!fgGetBool("/sim/rendering/shading"))) {
 352         // if fastest fog requested, or if flat shading force fastest
 353         glHint ( GL_FOG_HINT, GL_FASTEST );
 354     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 355         glHint ( GL_FOG_HINT, GL_NICEST );
 356     }
 357     if ( fgGetBool("/sim/rendering/wireframe") ) {
 358         // draw wire frame
 359         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 360     }
 361
 362     // This is the default anyways, but it can't hurt
 363     glFrontFace ( GL_CCW );
 364
 365     // Just testing ...
 366     // glEnable(GL_POINT_SMOOTH);
 367     // glEnable(GL_LINE_SMOOTH);
 368     // glEnable(GL_POLYGON_SMOOTH);
 369 }
 370
 371
 372 // For HiRes screen Dumps using Brian Pauls TR Library
 373 void trRenderFrame( void ) {
 374
 375     if ( fgPanelVisible() ) {
 376         GLfloat height = fgGetInt("/sim/startup/ysize");
 377         GLfloat view_h =
 378             (current_panel->getViewHeight() - current_panel->getYOffset())
 379             * (height / 768.0) + 1;
 380         glTranslatef( 0.0, view_h, 0.0 );
 381     }
 382
 383     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 384     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 385
 386     fgLIGHT *l = &cur_light_params;
 387
 388     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 389                  l->adj_fog_color[2], l->adj_fog_color[3]);
 390
 391     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 392
 393     // set the opengl state to known default values
 394     default_state->force();
 395
 396     glEnable( GL_FOG );
 397     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 398     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 399     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 400
 401     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 402     // we only update GL_AMBIENT for our lights we will never get
 403     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 404     // explicitely to black.
 405     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 406     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 407
 408     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 409
 410     // texture parameters
 411     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 412     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 413
 414     // we need a white diffuse light for the phase of the moon
 415     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 416     thesky->preDraw();
 417
 418     // draw the ssg scene
 419     // return to the desired diffuse color
 420     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 421     glEnable( GL_DEPTH_TEST );
 422     ssgSetNearFar( scene_nearplane, scene_farplane );
 423     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 424
 425     // draw the lights
 426     glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 427     ssgSetNearFar( scene_nearplane, scene_farplane );
 428     ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 429
 430     ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 431
 432     if (fgGetBool("/environment/clouds/status"))
 433         thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 434
 435     globals->get_model_mgr()->draw();
 436     globals->get_aircraft_model()->draw();
 437 }
 438
 439
 440 // Update all Visuals (redraws anything graphics related)
 441 void fgRenderFrame() {
 442
 443     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 444     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 445
 446     // Process/manage pending events
 447     global_events.update( delta_time_sec );
 448
 449     static const SGPropertyNode *longitude
 450         = fgGetNode("/position/longitude-deg");
 451     static const SGPropertyNode *latitude
 452         = fgGetNode("/position/latitude-deg");
 453     static const SGPropertyNode *altitude
 454         = fgGetNode("/position/altitude-ft");
 455     static const SGPropertyNode *groundlevel_nearplane
 456         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 457
 458     // Update the default (kludged) properties.
 459     fgUpdateProps();
 460
 461     FGViewer *current__view = globals->get_current_view();
 462
 463     fgLIGHT *l = &cur_light_params;
 464     static double last_visibility = -9999;
 465
 466     // update fog params
 467     double actual_visibility;
 468     if (fgGetBool("/environment/clouds/status"))
 469         actual_visibility = thesky->get_visibility();
 470     else
 471         actual_visibility = fgGetDouble("/environment/visibility-m");
 472     if ( actual_visibility != last_visibility ) {
 473         last_visibility = actual_visibility;
 474
 475         fog_exp_density = m_log01 / actual_visibility;
 476         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 477         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 478         if ( actual_visibility < 8000 ) {
 479             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 480             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 481         } else {
 482             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 483             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 484         }
 485     }
 486
 487     // double angle;
 488     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 489     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 490     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 491     // GLfloat mat_shininess[] = { 10.0 };
 492     GLbitfield clear_mask;
 493
 494     if ( idle_state != 1000 ) {
 495         // still initializing, draw the splash screen
 496         if ( fgGetBool("/sim/startup/splash-screen") ) {
 497             fgSplashUpdate(0.0, 1.0);
 498         }
 499         // Keep resetting sim time while the sim is initializing
 500         globals->set_sim_time_sec( 0.0 );
 501     } else {
 502         // idle_state is now 1000 meaning we've finished all our
 503         // initializations and are running the main loop, so this will
 504         // now work without seg faulting the system.
 505
 506         // calculate our current position in cartesian space
 507         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 508
 509         // update view port
 510         fgReshape( fgGetInt("/sim/startup/xsize"),
 511                    fgGetInt("/sim/startup/ysize") );
 512
 513         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 514             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 515             cloud3d_imposter_state->force();
 516             glDisable( GL_FOG );
 517             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 518             glEnable(GL_DEPTH_TEST);
 519             glEnable(GL_BLEND);
 520             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 521
 522 #ifdef FG_USE_CLOUDS_3D
 523             if ( _bcloud_orig ) {
 524                 Point3D c = globals->get_scenery()->get_center();
 525                 sgClouds3d->Set_Cloud_Orig( &c );
 526                 _bcloud_orig = false;
 527             }
 528             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 529 #endif
 530             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 531             glDisable(GL_DEPTH_TEST);
 532         }
 533
 534         clear_mask = GL_DEPTH_BUFFER_BIT;
 535         if ( fgGetBool("/sim/rendering/wireframe") ) {
 536             clear_mask |= GL_COLOR_BUFFER_BIT;
 537         }
 538
 539         if ( fgGetBool("/sim/rendering/skyblend") ) {
 540             if ( fgGetBool("/sim/rendering/textures") ) {
 541                 // glClearColor(black[0], black[1], black[2], black[3]);
 542                 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 543                              l->adj_fog_color[2], l->adj_fog_color[3]);
 544                 clear_mask |= GL_COLOR_BUFFER_BIT;
 545             }
 546         } else {
 547             glClearColor(l->sky_color[0], l->sky_color[1],
 548                          l->sky_color[2], l->sky_color[3]);
 549             clear_mask |= GL_COLOR_BUFFER_BIT;
 550         }
 551         glClear( clear_mask );
 552
 553         // Tell GL we are switching to model view parameters
 554
 555         // I really should create a derived ssg node or use a call
 556         // back or something so that I can draw the sky within the
 557         // ssgCullAndDraw() function, but for now I just mimic what
 558         // ssg does to set up the model view matrix
 559         glMatrixMode(GL_MODELVIEW);
 560         glLoadIdentity();
 561         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 562
 563         // set the opengl state to known default values
 564         default_state->force();
 565
 566         // update fog params if visibility has changed
 567         double visibility_meters = fgGetDouble("/environment/visibility-m");
 568         thesky->set_visibility(visibility_meters);
 569
 570         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 571                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 572                             / (double)fgGetInt("/sim/model-hz") );
 573
 574         // Set correct opengl fog density
 575         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 576
 577         // update the sky dome
 578         if ( fgGetBool("/sim/rendering/skyblend") ) {
 579             /* cout << "thesky->repaint() sky_color = "
 580                  << cur_light_params.sky_color[0] << " "
 581                  << cur_light_params.sky_color[1] << " "
 582                  << cur_light_params.sky_color[2] << " "
 583                  << cur_light_params.sky_color[3] << endl;
 584             cout << "    fog = "
 585                  << cur_light_params.fog_color[0] << " "
 586                  << cur_light_params.fog_color[1] << " "
 587                  << cur_light_params.fog_color[2] << " "
 588                  << cur_light_params.fog_color[3] << endl;
 589             cout << "    sun_angle = " << cur_light_params.sun_angle
 590                  << "    moon_angle = " << cur_light_params.moon_angle
 591                  << endl; */
 592             thesky->repaint( cur_light_params.sky_color,
 593                              cur_light_params.adj_fog_color,
 594                              cur_light_params.sun_angle,
 595                              cur_light_params.moon_angle,
 596                              globals->get_ephem()->getNumPlanets(),
 597                              globals->get_ephem()->getPlanets(),
 598                              globals->get_ephem()->getNumStars(),
 599                              globals->get_ephem()->getStars() );
 600
 601             /* cout << "thesky->reposition( view_pos = " << view_pos[0] << " "
 602                  << view_pos[1] << " " << view_pos[2] << endl;
 603             cout << "    zero_elev = " << zero_elev[0] << " "
 604                  << zero_elev[1] << " " << zero_elev[2]
 605                  << " lon = " << cur_fdm_state->get_Longitude()
 606                  << " lat = " << cur_fdm_state->get_Latitude() << endl;
 607             cout << "    sun_rot = " << cur_light_params.sun_rotation
 608                  << " gst = " << SGTime::cur_time_params->getGst() << endl;
 609             cout << "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 610                  << " sun dec = " << globals->get_ephem()->getSunDeclination()
 611                  << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 612                  << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 613
 614             thesky->reposition( current__view->get_view_pos(),
 615                                 current__view->get_zero_elev(),
 616                                 current__view->get_world_up(),
 617                                 current__view->getLongitude_deg()
 618                                   * SGD_DEGREES_TO_RADIANS,
 619                                 current__view->getLatitude_deg()
 620                                   * SGD_DEGREES_TO_RADIANS,
 621                                 current__view->getAltitudeASL_ft() * SG_FEET_TO_METER,
 622                                 cur_light_params.sun_rotation,
 623                                 globals->get_time_params()->getGst(),
 624                                 globals->get_ephem()->getSunRightAscension(),
 625                                 globals->get_ephem()->getSunDeclination(),
 626                                 50000.0,
 627                                 globals->get_ephem()->getMoonRightAscension(),
 628                                 globals->get_ephem()->getMoonDeclination(),
 629                                 50000.0 );
 630         }
 631
 632         glEnable( GL_DEPTH_TEST );
 633         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 634             glEnable( GL_FOG );
 635             glFogi( GL_FOG_MODE, GL_EXP2 );
 636             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 637         }
 638
 639         // set sun/lighting parameters
 640         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 641
 642         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 643         // we only update GL_AMBIENT for our lights we will never get
 644         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 645         // explicitely to black.
 646         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 647
 648         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 649         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 650         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 651
 652         // texture parameters
 653         // glEnable( GL_TEXTURE_2D );
 654         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 655         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 656
 657         // glMatrixMode( GL_PROJECTION );
 658         // glLoadIdentity();
 659         ssgSetFOV( current__view->get_h_fov(),
 660                    current__view->get_v_fov() );
 661
 662         double agl =
 663             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 664             - globals->get_scenery()->get_cur_elev();
 665
 666         if ( agl > 10.0 ) {
 667             scene_nearplane = 10.0f;
 668             scene_farplane = 120000.0f;
 669         } else {
 670             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 671             scene_farplane = 120000.0f;
 672         }
 673
 674         ssgSetNearFar( scene_nearplane, scene_farplane );
 675
 676         // $$$ begin - added VS Renganthan 17 Oct 2K
 677         if(objc)
 678           fgUpdateDCS();
 679         // $$$ end - added VS Renganthan 17 Oct 2K
 680
 681 # ifdef FG_NETWORK_OLK
 682         if ( fgGetBool("/sim/networking/network-olk") ) {
 683             sgCoord fgdpos;
 684             other = head->next;             /* put listpointer to start  */
 685             while ( other != tail) {        /* display all except myself */
 686                 if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 687                     other->fgd_sel->select(1);
 688                     sgSetCoord( &fgdpos, other->sgFGD_COORD );
 689                     other->fgd_pos->setTransform( &fgdpos );
 690                 }
 691                 other = other->next;
 692             }
 693
 694             // fgd_sel->select(1);
 695             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 696             // sgCoord fgdpos;
 697             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 698             // fgd_pos->setTransform( &fgdpos);
 699         }
 700 # endif
 701
 702 #ifdef FG_MPLAYER_AS
 703         // Update any multiplayer models
 704         globals->get_multiplayer_rx_mgr()->Update();
 705 #endif
 706
 707         if ( fgGetBool("/sim/rendering/skyblend") ) {
 708             // draw the sky backdrop
 709
 710             // we need a white diffuse light for the phase of the moon
 711             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 712
 713             thesky->preDraw();
 714
 715             // return to the desired diffuse color
 716             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 717         }
 718
 719         // draw the ssg scene
 720         glEnable( GL_DEPTH_TEST );
 721
 722         ssgSetNearFar( scene_nearplane, scene_farplane );
 723
 724         if ( fgGetBool("/sim/rendering/wireframe") ) {
 725             // draw wire frame
 726             glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 727         }
 728         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 729
 730         // This is a bit kludgy.  Every 200 frames, do an extra
 731         // traversal of the scene graph without drawing anything, but
 732         // with the field-of-view set to 360x360 degrees.  This
 733         // ensures that out-of-range random objects that are not in
 734         // the current view frustum will still be freed properly.
 735         static int counter = 0;
 736         counter++;
 737         if (counter == 200) {
 738           sgFrustum f;
 739           f.setFOV(360, 360);
 740                                 // No need to put the near plane too close;
 741                                 // this way, at least the aircraft can be
 742                                 // culled.
 743           f.setNearFar(1000, 1000000);
 744           sgMat4 m;
 745           ssgGetModelviewMatrix(m);
 746           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 747           counter = 0;
 748         }
 749
 750         // change state for lighting here
 751
 752         // draw runway lighting
 753         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 754         ssgSetNearFar( scene_nearplane, scene_farplane );
 755
 756 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 757         // Enable states for drawing points with GL_extension
 758         glEnable(GL_POINT_SMOOTH);
 759
 760         if ( fgGetBool("/sim/rendering/distance-attenuation")
 761              && glutExtensionSupported("GL_EXT_point_parameters") )
 762         {
 763             float quadratic[3] = {1.0, 0.001, 0.0000001};
 764             // makes the points fade as they move away
 765             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 766             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 767         }
 768         glPointSize(4.0);
 769
 770         // blending function for runway lights
 771         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 772 #endif
 773
 774         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 775         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 776         glEnable(GL_TEXTURE_GEN_S);
 777         glEnable(GL_TEXTURE_GEN_T);
 778         glPolygonMode(GL_FRONT, GL_POINT);
 779
 780         // draw runway lighting
 781         ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 782
 783         // change punch through and then draw taxi lighting
 784         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 785         // sgVec3 taxi_fog;
 786         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 787         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 788         ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 789
 790         // clean up lighting
 791         glPolygonMode(GL_FRONT, GL_FILL);
 792         glDisable(GL_TEXTURE_GEN_S);
 793         glDisable(GL_TEXTURE_GEN_T);
 794
 795         //static int _frame_count = 0;
 796         //if (_frame_count % 30 == 0) {
 797         //  printf("SSG: %s\n", ssgShowStats());
 798         //}
 799         //else {
 800         //  ssgShowStats();
 801         //}
 802         //_frame_count++;
 803
 804
 805 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 806         if ( fgGetBool("/sim/rendering/distance-attenuation")
 807              && glutExtensionSupported("GL_EXT_point_parameters") )
 808         {
 809             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 810                                   default_attenuation);
 811         }
 812
 813         glPointSize(1.0);
 814         glDisable(GL_POINT_SMOOTH);
 815 #endif
 816
 817         // draw ground lighting
 818         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 819         ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 820
 821         if ( fgGetBool("/sim/rendering/skyblend") ) {
 822             // draw the sky cloud layers
 823             if (fgGetBool("/environment/clouds/status")) {
 824                 thesky->postDraw( cur_fdm_state->get_Altitude()
 825                                   * SG_FEET_TO_METER );
 826             }
 827         }
 828
 829         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 830             glDisable( GL_FOG );
 831             glDisable( GL_LIGHTING );
 832             // cout << "drawing new clouds" << endl;
 833
 834             glEnable(GL_DEPTH_TEST);
 835             glEnable(GL_BLEND);
 836             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 837
 838             /*
 839             glEnable( GL_TEXTURE_2D );
 840             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 841             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 842             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 843             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 844             */
 845
 846 #ifdef FG_USE_CLOUDS_3D
 847             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 848 #endif
 849             glEnable( GL_FOG );
 850             glEnable( GL_LIGHTING );
 851             glEnable( GL_DEPTH_TEST );
 852             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 853         }
 854
 855         globals->get_model_mgr()->draw();
 856         globals->get_aircraft_model()->draw();
 857
 858         // display HUD && Panel
 859         glDisable( GL_FOG );
 860         glDisable( GL_DEPTH_TEST );
 861         // glDisable( GL_CULL_FACE );
 862         // glDisable( GL_TEXTURE_2D );
 863
 864         // update the controls subsystem
 865         globals->get_controls()->update(delta_time_sec);
 866
 867         hud_and_panel->apply();
 868         fgCockpitUpdate();
 869
 870         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 871         // This only works properly if called before the panel call
 872         globals->get_ATC_display()->update(delta_time_sec);
 873
 874         // update the panel subsystem
 875         if ( current_panel != NULL ) {
 876             current_panel->update(delta_time_sec);
 877         }
 878         fgUpdate3DPanels();
 879
 880         // We can do translucent menus, so why not. :-)
 881         menus->apply();
 882         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 883         puDisplay();
 884         // glDisable ( GL_BLEND ) ;
 885
 886         glEnable( GL_DEPTH_TEST );
 887         glEnable( GL_FOG );
 888
 889         // Fade out the splash screen over the first three seconds.
 890         double t = globals->get_sim_time_sec();
 891         if ( t <= 1.0 ) {
 892             fgSplashUpdate(0.0, 1.0);
 893         } else if ( t <= 3.0) {
 894             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 895         }
 896     }
 897
 898     glutSwapBuffers();
 899 }
 900
 901
 902 // Update internal time dependent calculations (i.e. flight model)
 903 // FIXME: this distinction is obsolete; all subsystems now get delta
 904 // time on update.
 905 void fgUpdateTimeDepCalcs() {
 906     static bool inited = false;
 907
 908     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 909
 910     fgLIGHT *l = &cur_light_params;
 911
 912     // Initialize the FDM here if it hasn't been and if we have a
 913     // scenery elevation hit.
 914
 915     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 916     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 917
 918     if ( !cur_fdm_state->get_inited() &&
 919          globals->get_scenery()->get_cur_elev() > -9990 )
 920     {
 921         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 922         cur_fdm_state->init();
 923         if ( cur_fdm_state->get_bound() ) {
 924             cur_fdm_state->unbind();
 925         }
 926         cur_fdm_state->bind();
 927     }
 928
 929 #ifndef FG_WEATHERCM
 930     globals->get_environment_mgr()->update(delta_time_sec);
 931 #endif
 932
 933     // conceptually, the following block could be done for each fdm
 934     // instance ...
 935     if ( !cur_fdm_state->get_inited() ) {
 936         // do nothing, fdm isn't inited yet
 937     } else {
 938         // we have been inited, and  we are good to go ...
 939
 940         if ( !inited ) {
 941             inited = true;
 942         }
 943
 944         globals->get_autopilot()->update(delta_time_sec);
 945         cur_fdm_state->update(delta_time_sec);
 946     }
 947
 948     globals->get_model_mgr()->update(delta_time_sec);
 949     globals->get_aircraft_model()->update(delta_time_sec);
 950
 951     // update the view angle
 952     globals->get_viewmgr()->update(delta_time_sec);
 953
 954     l->UpdateAdjFog();
 955
 956     // Update solar system
 957     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 958                                   globals->get_time_params()->getLst(),
 959                                   cur_fdm_state->get_Latitude() );
 960
 961     // Update radio stack model
 962     current_radiostack->update(delta_time_sec);
 963 }
 964
 965
 966 void fgInitTimeDepCalcs( void ) {
 967     // noop for now
 968 }
 969
 970
 971 static const double alt_adjust_ft = 3.758099;
 972 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 973
 974
 975 // What should we do when we have nothing else to do?  Let's get ready
 976 // for the next move and update the display?
 977 static void fgMainLoop( void ) {
 978
 979     static const SGPropertyNode *longitude
 980         = fgGetNode("/position/longitude-deg");
 981     static const SGPropertyNode *latitude
 982         = fgGetNode("/position/latitude-deg");
 983     static const SGPropertyNode *altitude
 984         = fgGetNode("/position/altitude-ft");
 985     static const SGPropertyNode *clock_freeze
 986         = fgGetNode("/sim/freeze/clock", true);
 987     static const SGPropertyNode *cur_time_override
 988         = fgGetNode("/sim/time/cur-time-override", true);
 989
 990     // Update the elapsed time.
 991     static bool first_time = true;
 992     if ( first_time ) {
 993         last_time_stamp.stamp();
 994         first_time = false;
 995     }
 996     current_time_stamp.stamp();
 997     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 998     if (clock_freeze->getBoolValue())
 999         delta_time_sec = 0;
1000     last_time_stamp = current_time_stamp;
1001     globals->inc_sim_time_sec( delta_time_sec );
1002
1003     static long remainder = 0;
1004     long elapsed;
1005 #ifdef FANCY_FRAME_COUNTER
1006     int i;
1007     double accum;
1008 #else
1009     static time_t last_time = 0;
1010     static int frames = 0;
1011 #endif // FANCY_FRAME_COUNTER
1012
1013     SGTime *t = globals->get_time_params();
1014
1015     FGLocation * acmodel_location = 0;
1016     if(cur_fdm_state->getACModel() != 0) {
1017       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
1018     }
1019
1020     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
1021     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
1022
1023 #ifdef FG_NETWORK_OLK
1024     if ( fgGetBool("/sim/networking/network-olk") ) {
1025         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
1026             // printf("FGD: Netupdate\n");
1027             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
1028             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
1029         }
1030     }
1031 #endif
1032
1033 #if defined( ENABLE_PLIB_JOYSTICK )
1034     // Read joystick and update control settings
1035     // if ( fgGetString("/sim/control-mode") == "joystick" )
1036     // {
1037     //    fgJoystickRead();
1038     // }
1039 #elif defined( ENABLE_GLUT_JOYSTICK )
1040     // Glut joystick support works by feeding a joystick handler
1041     // function to glut.  This is taken care of once in the joystick
1042     // init routine and we don't have to worry about it again.
1043 #endif
1044
1045     // Fix elevation.  I'm just sticking this here for now, it should
1046     // probably move eventually
1047
1048     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
1049            scenery.get_cur_elev(),
1050            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1051            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1052
1053 // Curt is this code used?  I don't see any problems when I comment it out.
1054     if ( acmodel_location != 0 ) {
1055       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
1056         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
1057              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
1058             // now set aircraft altitude above ground
1059             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
1060                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
1061                    acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
1062                    acmodel_location->get_cur_elev_m() + alt_adjust_m );
1063             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
1064                                                 + alt_adjust_m) * SG_METER_TO_FEET );
1065             SG_LOG( SG_ALL, SG_DEBUG,
1066                     "<*> resetting altitude to "
1067                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
1068                     << " meters" );
1069         }
1070       }
1071     }
1072 // End of code in question. (see Curt is this code used? above)
1073
1074     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
1075            scenery.get_cur_elev(),
1076            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1077            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1078
1079     // cout << "Warp = " << globals->get_warp() << endl;
1080
1081     // update "time"
1082     static bool last_clock_freeze = false;
1083
1084     if ( clock_freeze->getBoolValue() ) {
1085         // clock freeze requested
1086         if ( cur_time_override->getLongValue() == 0 ) {
1087             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
1088             globals->set_warp( 0 );
1089         }
1090     } else {
1091         // no clock freeze requested
1092         if ( last_clock_freeze == true ) {
1093             // clock just unfroze, let's set warp as the difference
1094             // between frozen time and current time so we don't get a
1095             // time jump (and corresponding sky object and lighting
1096             // jump.)
1097             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
1098             fgSetLong( "/sim/time/cur-time-override", 0 );
1099         }
1100         if ( globals->get_warp_delta() != 0 ) {
1101             globals->inc_warp( globals->get_warp_delta() );
1102         }
1103     }
1104
1105     last_clock_freeze = clock_freeze->getBoolValue();
1106
1107     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1108                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1109                cur_time_override->getLongValue(),
1110                globals->get_warp() );
1111
1112     if ( globals->get_warp_delta() != 0 ) {
1113         fgUpdateSkyAndLightingParams();
1114     }
1115
1116     // update magvar model
1117     globals->get_mag()->update( longitude->getDoubleValue()
1118                                   * SGD_DEGREES_TO_RADIANS,
1119                                 latitude->getDoubleValue()
1120                                   * SGD_DEGREES_TO_RADIANS,
1121                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
1122                                 globals->get_time_params()->getJD() );
1123
1124     // Get elapsed time (in usec) for this past frame
1125     elapsed = fgGetTimeInterval();
1126     SG_LOG( SG_ALL, SG_DEBUG,
1127             "Elapsed time interval is = " << elapsed
1128             << ", previous remainder is = " << remainder );
1129
1130     // Calculate frame rate average
1131 #ifdef FANCY_FRAME_COUNTER
1132     /* old fps calculation */
1133     if ( elapsed > 0 ) {
1134         double tmp;
1135         accum = 0.0;
1136         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1137             tmp = general.get_frame(i);
1138             accum += tmp;
1139             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1140             general.set_frame(i+1,tmp);
1141         }
1142         tmp = 1000000.0 / (float)elapsed;
1143         general.set_frame(0,tmp);
1144         // printf("frame[0] = %.2f\n", general.frames[0]);
1145         accum += tmp;
1146         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1147         // printf("ave = %.2f\n", general.frame_rate);
1148     }
1149 #else
1150     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1151         general.set_frame_rate( frames );
1152         SG_LOG( SG_ALL, SG_DEBUG,
1153                 "--> Frame rate is = " << general.get_frame_rate() );
1154         frames = 0;
1155     }
1156     last_time = t->get_cur_time();
1157     ++frames;
1158 #endif
1159
1160     // Run ATC subsystem
1161     globals->get_ATC_mgr()->update(delta_time_sec);
1162
1163     // Run the AI subsystem
1164     if (fgGetBool("/sim/ai-traffic/enabled"))
1165         globals->get_AI_mgr()->update(delta_time_sec);
1166
1167     // Run flight model
1168
1169     // Calculate model iterations needed for next frame
1170     elapsed += remainder;
1171
1172     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1173                               fgGetInt("/sim/model-hz"));
1174     remainder = elapsed - ( (global_multi_loop*1000000) /
1175                             fgGetInt("/sim/model-hz") );
1176     SG_LOG( SG_ALL, SG_DEBUG,
1177             "Model iterations needed = " << global_multi_loop
1178             << ", new remainder = " << remainder );
1179
1180     // chop max interations to something reasonable if the sim was
1181     // delayed for an excesive amount of time
1182     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1183         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1184         remainder = 0;
1185     }
1186
1187     // flight model
1188     if ( global_multi_loop > 0 ) {
1189         fgUpdateTimeDepCalcs();
1190     } else {
1191         SG_LOG( SG_ALL, SG_DEBUG,
1192                 "Elapsed time is zero ... we're zinging" );
1193     }
1194
1195     // Do any I/O channel work that might need to be done
1196     globals->get_io()->update( delta_time_sec );
1197
1198     // see if we need to load any deferred-load textures
1199     material_lib.load_next_deferred();
1200
1201     // Run audio scheduler
1202 #ifdef ENABLE_AUDIO_SUPPORT
1203     if ( fgGetBool("/sim/sound/audible")
1204            && globals->get_soundmgr()->is_working() ) {
1205         globals->get_soundmgr()->update( delta_time_sec );
1206     }
1207 #endif
1208
1209     globals->get_subsystem_mgr()->update(delta_time_sec);
1210
1211     //
1212     // Tile Manager updates - see if we need to load any new scenery tiles.
1213     //   this code ties together the fdm, viewer and scenery classes...
1214     //   we may want to move this to it's own class at some point
1215     //
1216     double visibility_meters = fgGetDouble("/environment/visibility-m");
1217     FGViewer *current_view = globals->get_current_view();
1218
1219     // update tile manager for FDM...
1220     // ...only if location is different than the viewer (to avoid duplicating effort)
1221     if( acmodel_location != current_view->getFGLocation() ) {
1222       if( acmodel_location != 0 ) {
1223         globals->get_tile_mgr()->prep_ssg_nodes( acmodel_location,
1224                                                  visibility_meters );
1225         globals->get_tile_mgr()->
1226             update( acmodel_location, visibility_meters,
1227                     acmodel_location->get_absolute_view_pos() );
1228         // save results of update in FGLocation for fdm...
1229         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1230           acmodel_location->
1231               set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1232         }
1233         acmodel_location->
1234             set_tile_center( globals->get_scenery()->get_next_center() );
1235       }
1236     }
1237
1238     globals->get_tile_mgr()->prep_ssg_nodes( current_view->getFGLocation(),
1239                                              visibility_meters );
1240     // update tile manager for view...
1241     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1242     // after the FDM's until all of Flight Gear code references the viewer's location
1243     // for elevation instead of the "scenery's" current elevation.
1244     FGLocation *view_location = globals->get_current_view()->getFGLocation();
1245     globals->get_tile_mgr()->update( view_location, visibility_meters,
1246                                      current_view->get_absolute_view_pos() );
1247     // save results of update in FGLocation for fdm...
1248     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1249       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1250     }
1251     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1252
1253     // If fdm location is same as viewer's then we didn't do the update for fdm location
1254     //   above so we need to save the viewer results in the fdm FGLocation as well...
1255     if( acmodel_location == current_view->getFGLocation() ) {
1256       if( acmodel_location != 0 ) {
1257         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1258           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1259         }
1260         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1261       }
1262     }
1263
1264     // END Tile Manager udpates
1265
1266     // redraw display
1267     fgRenderFrame();
1268
1269     SG_LOG( SG_ALL, SG_DEBUG, "" );
1270 }
1271
1272
1273 // This is the top level master main function that is registered as
1274 // our idle funciton
1275
1276 // The first few passes take care of initialization things (a couple
1277 // per pass) and once everything has been initialized fgMainLoop from
1278 // then on.
1279
1280 static void fgIdleFunction ( void ) {
1281     // printf("idle state == %d\n", idle_state);
1282
1283     if ( idle_state == 0 ) {
1284         // Initialize the splash screen right away
1285         if ( fgGetBool("/sim/startup/splash-screen") ) {
1286             fgSplashInit();
1287         }
1288
1289         idle_state++;
1290     } else if ( idle_state == 1 ) {
1291         // Initialize audio support
1292 #ifdef ENABLE_AUDIO_SUPPORT
1293
1294         // Start the intro music
1295         if ( fgGetBool("/sim/startup/intro-music") ) {
1296             SGPath mp3file( globals->get_fg_root() );
1297             mp3file.append( "Sounds/intro.mp3" );
1298
1299             SG_LOG( SG_GENERAL, SG_INFO,
1300                     "Starting intro music: " << mp3file.str() );
1301
1302 #if defined( __CYGWIN__ )
1303             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1304 #elif defined( WIN32 )
1305             string command = "start /m " + mp3file.str();
1306 #else
1307             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1308 #endif
1309
1310             system ( command.c_str() );
1311         }
1312 #endif
1313
1314         idle_state++;
1315     } else if ( idle_state == 2 ) {
1316         // These are a few miscellaneous things that aren't really
1317         // "subsystems" but still need to be initialized.
1318
1319 #ifdef USE_GLIDE
1320         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1321             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1322         }
1323 #endif
1324
1325         idle_state++;
1326     } else if ( idle_state == 3 ) {
1327         // This is the top level init routine which calls all the
1328         // other subsystem initialization routines.  If you are adding
1329         // a subsystem to flightgear, its initialization call should
1330         // located in this routine.
1331         if( !fgInitSubsystems()) {
1332             SG_LOG( SG_GENERAL, SG_ALERT,
1333                     "Subsystem initializations failed ..." );
1334             exit(-1);
1335         }
1336
1337         idle_state++;
1338     } else if ( idle_state == 4 ) {
1339         // setup OpenGL view parameters
1340         fgInitVisuals();
1341
1342         idle_state++;
1343     } else if ( idle_state == 5 ) {
1344
1345         idle_state++;
1346     } else if ( idle_state == 6 ) {
1347         // sleep(1);
1348         idle_state = 1000;
1349
1350         SG_LOG( SG_GENERAL, SG_INFO, "Panel visible = " << fgPanelVisible() );
1351         fgReshape( fgGetInt("/sim/startup/xsize"),
1352                    fgGetInt("/sim/startup/ysize") );
1353     }
1354
1355     if ( idle_state == 1000 ) {
1356         // We've finished all our initialization steps, from now on we
1357         // run the main loop.
1358
1359         glutIdleFunc(fgMainLoop);
1360     } else {
1361         if ( fgGetBool("/sim/startup/splash-screen") ) {
1362             fgSplashUpdate(0.0, 1.0);
1363         }
1364     }
1365 }
1366
1367 // options.cxx needs to see this for toggle_panel()
1368 // Handle new window size or exposure
1369 void fgReshape( int width, int height ) {
1370     int view_h;
1371
1372     if ( (!fgGetBool("/sim/virtual-cockpit"))
1373          && fgPanelVisible() && idle_state == 1000 ) {
1374         view_h = (int)(height * (current_panel->getViewHeight() -
1375                                  current_panel->getYOffset()) / 768.0);
1376     } else {
1377         view_h = height;
1378     }
1379
1380     // for all views
1381     FGViewMgr *viewmgr = globals->get_viewmgr();
1382     for ( int i = 0; i < viewmgr->size(); ++i ) {
1383       viewmgr->get_view(i)->
1384         set_aspect_ratio((float)view_h / (float)width);
1385     }
1386
1387     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1388
1389     fgSetInt("/sim/startup/xsize", width);
1390     fgSetInt("/sim/startup/ysize", height);
1391     guiInitMouse(width, height);
1392
1393     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1394                viewmgr->get_current_view()->get_v_fov() );
1395
1396     fgHUDReshape();
1397
1398 #ifdef FG_USE_CLOUDS_3D
1399     sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
1400                         viewmgr->get_current_view()->get_v_fov() );
1401 #endif
1402
1403 }
1404
1405 // Initialize GLUT and define a main window
1406 static bool fgGlutInit( int *argc, char **argv ) {
1407
1408 #if !defined( macintosh )
1409     // GLUT will extract all glut specific options so later on we only
1410     // need wory about our own.
1411     glutInit(argc, argv);
1412 #endif
1413
1414     // Define Display Parameters. Clouds3d works best with --bpp32 option
1415     if ( fgGetBool("/sim/rendering/clouds3d") ) {
1416         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_ALPHA );
1417     } else {
1418         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1419     }
1420
1421     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1422             fgGetInt("/sim/startup/xsize") << "x"
1423             << fgGetInt("/sim/startup/ysize") );
1424
1425     // Define initial window size
1426     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1427                         fgGetInt("/sim/startup/ysize") );
1428
1429     // Initialize windows
1430     if ( !fgGetBool("/sim/startup/game-mode")) {
1431         // Open the regular window
1432         glutCreateWindow("FlightGear");
1433 #ifndef GLUT_WRONG_VERSION
1434     } else {
1435         // Open the cool new 'game mode' window
1436         char game_mode_str[256];
1437 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1438 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1439 #ifndef ENUM_CURRENT_SETTINGS
1440 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1441 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1442 #endif
1443
1444         DEVMODE dm;
1445         dm.dmSize = sizeof(DEVMODE);
1446         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1447         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1448         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1449         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1450                                                 fgGetInt("/sim/startup/ysize") );
1451         sprintf( game_mode_str, "%dx%d:%d@%d",
1452                          dm.dmPelsWidth,
1453                          dm.dmPelsHeight,
1454                          dm.dmBitsPerPel,
1455                          dm.dmDisplayFrequency );
1456 #else
1457         // Open the cool new 'game mode' window
1458         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1459                  fgGetInt("/sim/startup/xsize"),
1460                  fgGetInt("/sim/startup/ysize"),
1461                  fgGetInt("/sim/rendering/bits-per-pixel"));
1462
1463 #endif // HAVE_WINDOWS_H
1464         SG_LOG( SG_GENERAL, SG_INFO,
1465                 "game mode params = " << game_mode_str );
1466         glutGameModeString( game_mode_str );
1467         glutEnterGameMode();
1468 #endif // GLUT_WRONG_VERSION
1469     }
1470
1471     // This seems to be the absolute earliest in the init sequence
1472     // that these calls will return valid info.  Too bad it's after
1473     // we've already created and sized out window. :-(
1474     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1475     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1476     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1477     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1478
1479     GLint tmp;
1480     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1481     general.set_glMaxTexSize( tmp );
1482     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1483
1484     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1485     general.set_glDepthBits( tmp );
1486     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1487
1488     return true;
1489 }
1490
1491
1492 // Initialize GLUT event handlers
1493 static bool fgGlutInitEvents( void ) {
1494     // call fgReshape() on window resizes
1495     glutReshapeFunc( fgReshape );
1496
1497     // keyboard and mouse callbacks are set in FGInput::init
1498
1499     // call fgMainLoop() whenever there is
1500     // nothing else to do
1501     glutIdleFunc( fgIdleFunction );
1502
1503     // draw the scene
1504     glutDisplayFunc( fgRenderFrame );
1505
1506     return true;
1507 }
1508
1509 // Main top level initialization
1510 static bool fgMainInit( int argc, char **argv ) {
1511
1512 #if defined( macintosh )
1513     freopen ("stdout.txt", "w", stdout );
1514     freopen ("stderr.txt", "w", stderr );
1515     argc = ccommand( &argv );
1516 #endif
1517
1518     // set default log levels
1519     sglog().setLogLevels( SG_ALL, SG_INFO );
1520
1521     string version;
1522 #ifdef FLIGHTGEAR_VERSION
1523     version = FLIGHTGEAR_VERSION;
1524 #else
1525     version = "unknown version";
1526 #endif
1527     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1528             << version );
1529     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1530
1531     // Allocate global data structures.  This needs to happen before
1532     // we parse command line options
1533
1534     globals = new FGGlobals;
1535
1536 #ifndef FG_WEATHERCM
1537     globals->set_environment_mgr(new FGEnvironmentMgr);
1538 #endif
1539
1540     // seed the random number generater
1541     sg_srandom_time();
1542
1543     SGRoute *route = new SGRoute;
1544     globals->set_route( route );
1545
1546     FGControls *controls = new FGControls;
1547     globals->set_controls( controls );
1548
1549     string_list *col = new string_list;
1550     globals->set_channel_options_list( col );
1551
1552     // Scan the config file(s) and command line options to see if
1553     // fg_root was specified (ignore all other options for now)
1554     fgInitFGRoot(argc, argv);
1555
1556     // Check for the correct base package version
1557     static char required_version[] = "0.9.1";
1558     string base_version = fgBasePackageVersion();
1559     if ( !(base_version == required_version) ) {
1560         // tell the operator how to use this application
1561
1562         cerr << endl << "Base package check failed ... " \
1563              << "Found version " << base_version << " at: " \
1564              << globals->get_fg_root() << endl;
1565         cerr << "Please upgrade to version: " << required_version << endl;
1566         exit(-1);
1567     }
1568
1569     // Initialize the Aircraft directory to "" (UIUC)
1570     aircraft_dir = "";
1571
1572     // Load the configuration parameters.  (Command line options
1573     // overrides config file options.  Config file options override
1574     // defaults.)
1575     if ( !fgInitConfig(argc, argv) ) {
1576         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1577         exit(-1);
1578     }
1579
1580     // Initialize the Window/Graphics environment.
1581     if( !fgGlutInit(&argc, argv) ) {
1582         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1583         exit(-1);
1584     }
1585
1586     // Initialize the various GLUT Event Handlers.
1587     if( !fgGlutInitEvents() ) {
1588         SG_LOG( SG_GENERAL, SG_ALERT,
1589                 "GLUT event handler initialization failed ..." );
1590         exit(-1);
1591     }
1592
1593     // Initialize plib net interface
1594     netInit( &argc, argv );
1595
1596     // Initialize ssg (from plib).  Needs to come before we do any
1597     // other ssg stuff, but after opengl/glut has been initialized.
1598     ssgInit();
1599
1600     // Initialize the user interface (we need to do this before
1601     // passing off control to glut and before fgInitGeneral to get our
1602     // fonts !!!
1603     guiInit();
1604
1605 #ifdef GL_EXT_texture_lod_bias
1606     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1607 #endif
1608
1609 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
1610             // get the address of our OpenGL extensions
1611     if ( fgGetBool("/sim/rendering/distance-attenuation") )
1612     {
1613 #ifdef WIN32
1614         glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
1615             wglGetProcAddress("glPointParameterfEXT");
1616         glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
1617             wglGetProcAddress("glPointParameterfvEXT");
1618 #elif linux
1619         glPointParameterfEXT = (OpenGLFuncExt)
1620             glXGetProcAddressARB((GLubyte *)"glPointParameterfEXT");
1621         glPointParameterfvEXT = (OpenGLFuncExtv)
1622             glXGetProcAddressARB((GLubyte *)"glPointParameterfvEXT");
1623 #endif
1624    }
1625 #endif
1626
1627     // based on the requested presets, calculate the true starting
1628     // lon, lat
1629     fgInitNav();
1630     fgInitPosition();
1631
1632     SGTime *t = fgInitTime();
1633     globals->set_time_params( t );
1634
1635     // Do some quick general initializations
1636     if( !fgInitGeneral()) {
1637         SG_LOG( SG_GENERAL, SG_ALERT,
1638                 "General initializations failed ..." );
1639         exit(-1);
1640     }
1641
1642     SGPath modelpath( globals->get_fg_root() );
1643     ssgModelPath( (char *)modelpath.c_str() );
1644
1645     // Initialize the global scenery manager
1646     globals->set_scenery( new FGScenery );
1647     globals->get_scenery()->init();
1648     globals->get_scenery()->bind();
1649
1650     // Initialize the global tile manager
1651     globals->set_tile_mgr( new FGTileMgr );
1652
1653     ////////////////////////////////////////////////////////////////////
1654     // Initialize the property-based built-in commands
1655     ////////////////////////////////////////////////////////////////////
1656     fgInitCommands();
1657
1658     ////////////////////////////////////////////////////////////////////
1659     // Initialize the general model subsystem.
1660     ////////////////////////////////////////////////////////////////////
1661
1662     globals->set_model_loader(new FGModelLoader);
1663     globals->set_texture_loader(new FGTextureLoader);
1664     globals->set_model_mgr(new FGModelMgr);
1665     globals->get_model_mgr()->init();
1666     globals->get_model_mgr()->bind();
1667
1668     ////////////////////////////////////////////////////////////////////
1669     // Initialize the 3D aircraft model subsystem.
1670     ////////////////////////////////////////////////////////////////////
1671
1672     globals->set_aircraft_model(new FGAircraftModel);
1673     globals->get_aircraft_model()->init();
1674     globals->get_aircraft_model()->bind();
1675
1676     ////////////////////////////////////////////////////////////////////
1677     // Initialize the view manager subsystem.
1678     ////////////////////////////////////////////////////////////////////
1679
1680     FGViewMgr *viewmgr = new FGViewMgr;
1681     globals->set_viewmgr( viewmgr );
1682     viewmgr->init();
1683     viewmgr->bind();
1684
1685
1686     // Initialize the sky
1687     SGPath ephem_data_path( globals->get_fg_root() );
1688     ephem_data_path.append( "Astro" );
1689     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1690     ephem->update( globals->get_time_params()->getMjd(),
1691                    globals->get_time_params()->getLst(),
1692                    0.0 );
1693     globals->set_ephem( ephem );
1694
1695                                 // TODO: move to environment mgr
1696     thesky = new SGSky;
1697     SGPath texture_path(globals->get_fg_root());
1698     texture_path.append("Textures");
1699     texture_path.append("Sky");
1700     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1701         SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1702         thesky->add_cloud_layer(layer);
1703     }
1704
1705
1706     SGPath sky_tex_path( globals->get_fg_root() );
1707     sky_tex_path.append( "Textures" );
1708     sky_tex_path.append( "Sky" );
1709     thesky->texture_path( sky_tex_path.str() );
1710
1711     thesky->build( 550.0, 550.0,
1712                    globals->get_ephem()->getNumPlanets(),
1713                    globals->get_ephem()->getPlanets(), 60000.0,
1714                    globals->get_ephem()->getNumStars(),
1715                    globals->get_ephem()->getStars(), 60000.0 );
1716
1717     // Initialize MagVar model
1718     SGMagVar *magvar = new SGMagVar();
1719     globals->set_mag( magvar );
1720
1721     // airport = new ssgBranch;
1722     // airport->setName( "Airport Lighting" );
1723     // lighting->addKid( airport );
1724
1725     // ADA
1726     fgLoadDCS();
1727     // ADA
1728
1729 #ifdef FG_NETWORK_OLK
1730     // Do the network intialization
1731     if ( fgGetBool("/sim/networking/network-olk") ) {
1732         printf("Multipilot mode %s\n",
1733                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1734     }
1735 #endif
1736
1737     // build our custom render states
1738     fgBuildRenderStates();
1739
1740     // pass control off to the master GLUT event handler
1741     glutMainLoop();
1742
1743     // we never actually get here ... but to avoid compiler warnings,
1744     // etc.
1745     return false;
1746 }
1747
1748
1749 // $$$ end - added VS Renganathan, 15 Oct 2K
1750 //         - added Venky         , 12 Nov 2K
1751
1752 #if defined(__linux__) && defined(__i386__)
1753
1754 static void handleFPE (int);
1755
1756 static void
1757 initFPE ()
1758 {
1759     fpu_control_t fpe_flags = 0;
1760     _FPU_GETCW(fpe_flags);
1761 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1762 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1763 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1764 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1765 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1766 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1767     _FPU_SETCW(fpe_flags);
1768     signal(SIGFPE, handleFPE);
1769 }
1770
1771 static void
1772 handleFPE (int num)
1773 {
1774   initFPE();
1775   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1776 }
1777 #endif
1778
1779 #ifdef __APPLE__
1780
1781 typedef struct
1782 {
1783   int  lo;
1784   int  hi;
1785 } PSN;
1786
1787 extern "C" {
1788   short CPSGetCurrentProcess(PSN *psn);
1789   short CPSSetProcessName (PSN *psn, char *processname);
1790   short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
1791   short CPSSetFrontProcess(PSN *psn);
1792 };
1793
1794 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
1795
1796 #endif
1797
1798 // Main entry point; catch any exceptions that have made it this far.
1799 int main ( int argc, char **argv ) {
1800
1801     // Enable floating-point exceptions for Linux/x86
1802 #if defined(__linux__) && defined(__i386__)
1803     initFPE();
1804 #endif
1805
1806     // Enable floating-point exceptions for Windows
1807 #if defined( _MSC_VER ) && defined( DEBUG )
1808     // Christian, we should document what this does
1809     _control87( _EM_INEXACT, _MCW_EM );
1810 #endif
1811
1812 #if defined( HAVE_BC5PLUS )
1813     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1814 #endif
1815
1816     // Keyboard focus hack
1817 #ifdef __APPLE__
1818     {
1819       PSN psn;
1820
1821       glutInit (&argc, argv);
1822
1823       CPSGetCurrentProcess(&psn);
1824       CPSSetProcessName(&psn, "FlightGear");
1825       CPSEnableFG(&psn);
1826       CPSSetFrontProcess(&psn);
1827     }
1828 #endif
1829
1830     // FIXME: add other, more specific
1831     // exceptions.
1832     try {
1833         fgMainInit(argc, argv);
1834     } catch (sg_throwable &t) {
1835                                 // We must use cerr rather than
1836                                 // logging, since logging may be
1837                                 // disabled.
1838         cerr << "Fatal error: " << t.getFormattedMessage()
1839              << "\n (received from " << t.getOrigin() << ')' << endl;
1840         exit(1);
1841     }
1842
1843     return 0;
1844 }
1845
1846
1847 void fgLoadDCS(void) {
1848
1849     ssgEntity *ship_obj = NULL;
1850
1851     char obj_filename[25];
1852
1853     for ( int k = 0; k < 32; k++ ) {
1854         ship_pos[k]=NULL;
1855     }
1856
1857     SGPath tile_path( globals->get_fg_root());
1858     tile_path.append( "Scenery" );
1859     tile_path.append( "Objects.txt" );
1860     sg_gzifstream in( tile_path.str() );
1861     if ( ! in.is_open() ) {
1862         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1863     } else {
1864
1865         SGPath modelpath( globals->get_fg_root() );
1866         modelpath.append( "Models" );
1867         modelpath.append( "Geometry" );
1868
1869         SGPath texturepath( globals->get_fg_root() );
1870         texturepath.append( "Models" );
1871         texturepath.append( "Textures" );
1872
1873         ssgModelPath( (char *)modelpath.c_str() );
1874         ssgTexturePath( (char *)texturepath.c_str() );
1875
1876         ship_sel = new ssgSelector;
1877
1878         char c;
1879         while ( ! in.eof() ) {
1880             in >> ::skipws;
1881             if ( in.get( c ) && c == '#' ) {
1882                 in >> skipeol;
1883             } else {
1884                 in.putback(c);
1885                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1886                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1887                    int chj=getchar();*/
1888
1889                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1890                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1891
1892                 ship_pos[objc] = new ssgTransform;
1893
1894                 // type "repeat" in objects.txt to load one more
1895                 // instance of the last object.
1896
1897                 if ( strcmp(obj_filename,"repeat") != 0) {
1898                     ship_obj =
1899                         globals->get_model_loader()->load_model( obj_filename );
1900                 }
1901
1902                 if ( ship_obj != NULL ) {
1903                                         ship_obj->setName(obj_filename);
1904                                 if (objc == 0)
1905                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1906                                         else
1907                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1908                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1909                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1910                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1911                             << obj_filename );
1912                 } else {
1913                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1914                             << obj_filename );
1915                 }
1916
1917                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1918                                 //const char *extn = file_extension ( obj_filename ) ;
1919                                 if ( objc == 1 ){
1920                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1921                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1922                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1923                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1924                                         int ltype[500], light_type;
1925                                         static int ltcount = 0;
1926                                     string token;
1927                                         sgVec3 rway_dir,rway_normal,lightpt;
1928                                         Point3D node;
1929                                         modelpath.append(obj_filename);
1930                                         sg_gzifstream in1( modelpath.str() );
1931                                         if ( ! in1.is_open() ) {
1932                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1933                                         } else {
1934                                                 while ( ! in1.eof() ) {
1935                                                         in1 >> ::skipws;
1936                                                         if ( in1.get( c ) && c == '#' ) {
1937                                                                 in1 >> skipeol;
1938                                                         } else {
1939                                                                 in1.putback(c);
1940                                                                 in1 >> token;
1941                                                                 //cout << token << endl;
1942                                                                 if ( token == "runway" ) {
1943                                                                         in1 >> node;
1944                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1945                                                                 } else if ( token == "edgelight" ) {
1946                                                                         in1 >> node;
1947                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1948                                                                         light_type = 1;
1949                                                                 } else if ( token == "taxi" ) {
1950                                                                         in1 >> node;
1951                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1952                                                                         light_type = 2;
1953                                                                 } else if ( token == "vasi" ) {
1954                                                                         in1 >> node;
1955                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1956                                                                         light_type = 3;
1957                                                                 } else if ( token == "threshold" ) {
1958                                                                         in1 >> node;
1959                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1960                                                                         light_type = 4;
1961                                                                 } else if ( token == "rabbit" ) {
1962                                                                         in1 >> node;
1963                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1964                                                                         light_type = 5;
1965                                                                 } else if ( token == "ols" ) {
1966                                                                         in1 >> node;
1967                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1968                                                                         light_type = 6;
1969                                                                 } else if ( token == "red" ) {
1970                                                                         in1 >> node;
1971                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1972                                                                         light_type = 7;
1973                                                                 } else if ( token == "green" ) {
1974                                                                         in1 >> node;
1975                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1976                                                                         light_type = 8;
1977                                                                 } else if ( token == "lp" ) {
1978                                                                         in1 >> node;
1979                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1980                                                                         lightpoints->add( lightpt );
1981                                                                         lightnormals->add( rway_normal );
1982                                                                         lightdir->add( rway_dir );
1983                                                                         ltype[ltcount]= light_type;
1984                                                                         ltcount++;
1985                                                                 }
1986                                                                 if (in1.eof()) break;
1987                                                         }
1988                                                 }  //while
1989
1990                                                 if ( lightpoints->getNum() ) {
1991                                                         ssgBranch *lightpoints_branch;
1992                                                         long int dummy = -999;
1993                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1994                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1995                                                         dummy_tile->ols_transform = new ssgTransform;
1996
1997                                                         // call function to generate the runway lights
1998                                                         lightpoints_branch =
1999                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
2000                                                                                                                                 lightdir, ltype);
2001                                                         lightpoints_brightness->addKid(lightpoints_branch);
2002                                                         lightpoints_transform->addKid(lightpoints_brightness);
2003                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
2004                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
2005                                                         lightpoints_transform->ref();
2006                                                         globals->get_scenery()->get_gnd_lights_root()->addKid( lightpoints_transform );
2007                                                 }
2008                                         } //if in1
2009                 } //if objc
2010                                 // end hack for deck lights
2011
2012                 objc++;
2013
2014                 if (in.eof()) break;
2015             }
2016         } // while
2017
2018         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
2019
2020         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
2021     }
2022
2023     return;
2024  }
2025
2026
2027 void fgUpdateDCS (void) {
2028
2029     // double eye_lat,eye_lon,eye_alt;
2030     // static double obj_head;
2031     double sl_radius,obj_latgc;
2032     // float nresultmat[4][4];
2033     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
2034     double bz[3];
2035
2036     // Instantaneous Geodetic Lat/Lon/Alt of moving object
2037     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
2038
2039     // Deck should be the first object in objects.txt in case of fdm=ada
2040
2041     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
2042                 if ((fdm->get_iaux(1))==1)
2043                 {
2044                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
2045                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
2046                         obj_alt[1] = fdm->get_daux(3);
2047                         obj_pitch[1] = fdm->get_faux(1);
2048                         obj_roll[1] = fdm->get_faux(2);
2049                 }
2050     }
2051
2052     for ( int m = 0; m < objc; m++ ) {
2053         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
2054         //int v=getchar();
2055
2056         //Geodetic to Geocentric angles for rotation
2057         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
2058
2059         //moving object gbs-posn in cartesian coords
2060         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
2061         Point3D obj_pos = sgGeodToCart( obj_posn );
2062
2063         // Translate moving object w.r.t eye
2064         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
2065         bz[0]=Objtrans.x();
2066         bz[1]=Objtrans.y();
2067         bz[2]=Objtrans.z();
2068
2069        // rotate dynamic objects for lat,lon & alt and other motion about its axes
2070
2071         sgMat4 sgTRANS;
2072         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
2073
2074         sgVec3 ship_fwd,ship_rt,ship_up;
2075         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
2076         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
2077         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
2078
2079         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
2080         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
2081         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
2082         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
2083         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
2084         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
2085
2086         sgMat4 sgTUX;
2087         sgCopyMat4( sgTUX, sgROT_hdg );
2088         sgPostMultMat4( sgTUX, sgROT_pitch );
2089         sgPostMultMat4( sgTUX, sgROT_roll );
2090         sgPostMultMat4( sgTUX, sgROT_lat );
2091         sgPostMultMat4( sgTUX, sgROT_lon );
2092         sgPostMultMat4( sgTUX, sgTRANS );
2093
2094         sgCoord shippos;
2095         sgSetCoord(&shippos, sgTUX );
2096         ship_pos[m]->setTransform( &shippos );
2097         // temporary hack for deck lights - ultimately should move to PLib (when ??)
2098         if (m == 1) {
2099                 if (lightpoints_transform) {
2100                         lightpoints_transform->setTransform( &shippos );
2101                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
2102                         if ( sun_angle > 89 ) {
2103                                 lightpoints_brightness->select(0x01);
2104                         } else {
2105                                 lightpoints_brightness->select(0x00);
2106                         }
2107                 }
2108
2109                 float elev;
2110                 sgVec3 rp,to;
2111                 float *vp;
2112                 float alt;
2113                 float ref_elev;
2114                 sgXformPnt3( rp, rway_ols, sgTUX );
2115                 vp = globals->get_current_view()->get_view_pos();
2116             to[0] = rp[0]-vp[0];
2117             to[1] = rp[1]-vp[1];
2118             to[2] = rp[2]-vp[2];
2119                 float dist = sgLengthVec3( to );
2120                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
2121
2122                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
2123
2124             ref_elev = elev - 3.75; // +ve above, -ve below
2125
2126                 unsigned int sel;
2127                 sel = 0xFF;
2128 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2129 //              if (ref_elev > 0.51) sel = 0x21;
2130 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
2131 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
2132 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
2133 //              if (ref_elev < -0.51) sel = 0x30;
2134 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2135                 dummy_tile->lightmaps_sequence->select(sel);
2136
2137                 sgVec3 up;
2138                 sgCopyVec3 (up, ship_up);
2139                 if (dist > 750)
2140                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
2141                 else
2142                         sgScaleVec3 (up, 4.0*ref_elev);
2143                 dummy_tile->ols_transform->setTransform(up);
2144                 //cout << "ref_elev  " << ref_elev << endl;
2145         }
2146     // end hack for deck lights
2147
2148     }
2149     if ( ship_sel != NULL ) {
2150         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2151     }
2152 }
2153
2154 // $$$ end - added VS Renganathan, 15 Oct 2K
2155 //           added Venky         , 12 Nov 2K