src/Main/main.cxx

   1 // main.cxx -- top level sim routines
   2 //
   3 // Written by Curtis Olson, started May 1997.
   4 //
   5 // Copyright (C) 1997 - 2002  Curtis L. Olson  - curt@flightgear.org
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 //
  21 // $Id$
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include <config.h>
  26 #endif
  27
  28 #if defined(__linux__) && defined(__i386__)
  29 #  include <fpu_control.h>
  30 #  include <signal.h>
  31 #endif
  32
  33 #include <simgear/compiler.h>
  34
  35 #include STL_IOSTREAM
  36 #ifndef SG_HAVE_NATIVE_SGI_COMPILERS
  37 SG_USING_STD(cerr);
  38 SG_USING_STD(endl);
  39 #endif
  40
  41 #include <simgear/misc/exception.hxx>
  42 #include <simgear/ephemeris/ephemeris.hxx>
  43 #include <simgear/route/route.hxx>
  44
  45 #ifdef SG_MATH_EXCEPTION_CLASH
  46 #  include <math.h>
  47 #endif
  48
  49 #ifdef HAVE_WINDOWS_H
  50 #  include <windows.h>
  51 #  include <float.h>
  52 #endif
  53
  54 #include <GL/glut.h>
  55 #include <GL/gl.h>
  56
  57 #include <stdio.h>
  58 #include <string.h>             // for strcmp()
  59 #include <string>
  60
  61 #ifdef HAVE_STDLIB_H
  62 #   include <stdlib.h>
  63 #endif
  64
  65 #ifdef HAVE_SYS_STAT_H
  66 #  include <sys/stat.h>         // for stat()
  67 #endif
  68
  69 #ifdef HAVE_UNISTD_H
  70 #  include <unistd.h>           // for stat()
  71 #endif
  72
  73 #include <plib/netChat.h>
  74 #include <plib/pu.h>
  75 #include <plib/sg.h>
  76 #include <plib/ssg.h>
  77
  78 #include <simgear/constants.h>  // for VERSION
  79 #include <simgear/debug/logstream.hxx>
  80 #include <simgear/math/polar3d.hxx>
  81 #include <simgear/math/sg_random.h>
  82 #include <simgear/misc/sg_path.hxx>
  83 #include <simgear/sky/clouds3d/SkySceneLoader.hpp>
  84 #include <simgear/sky/clouds3d/SkyUtil.hpp>
  85 #include <simgear/sky/sky.hxx>
  86 #include <simgear/timing/sg_time.hxx>
  87
  88 #include <Include/general.hxx>
  89
  90 #include <Aircraft/aircraft.hxx>
  91
  92 #include <ATC/ATCmgr.hxx>
  93 #include <ATC/ATCdisplay.hxx>
  94 #include <ATC/AIMgr.hxx>
  95
  96
  97 #include <Autopilot/newauto.hxx>
  98
  99 #include <Cockpit/cockpit.hxx>
 100 #include <Cockpit/radiostack.hxx>
 101 #include <Cockpit/steam.hxx>
 102
 103 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 104 #include <GUI/gui.h>
 105 #include <Model/acmodel.hxx>
 106 #include <Model/loader.hxx>
 107 #include <Model/model.hxx>
 108 #include <Model/modelmgr.hxx>
 109 #include <Main/location.hxx>
 110 #include <Model/panelnode.hxx>
 111 #ifdef FG_NETWORK_OLK
 112 #include <NetworkOLK/network.h>
 113 #endif
 114 #include <Objects/matlib.hxx>
 115 #include <Scenery/scenery.hxx>
 116 #include <Scenery/tilemgr.hxx>
 117 #ifdef ENABLE_AUDIO_SUPPORT
 118 #  include <Sound/soundmgr.hxx>
 119 #  include <Sound/fg_fx.hxx>
 120 #  include <Sound/morse.hxx>
 121 #endif
 122 #include <Systems/system_mgr.hxx>
 123 #include <Instrumentation/instrument_mgr.hxx>
 124 #include <Time/FGEventMgr.hxx>
 125 #include <Time/fg_timer.hxx>
 126 #include <Time/light.hxx>
 127 #include <Time/sunpos.hxx>
 128 #include <Time/tmp.hxx>
 129
 130 // ADA
 131 #include <simgear/misc/sgstream.hxx>
 132 #include <simgear/math/point3d.hxx>
 133 #include <FDM/flight.hxx>
 134 #include <FDM/ADA.hxx>
 135 #include <Scenery/tileentry.hxx>
 136
 137 #include "fg_commands.hxx"
 138
 139 // #define FG_EXPERIMENTAL_LIGHTING
 140 #ifdef FG_EXPERIMENTAL_LIGHTING
 141 #  ifdef WIN32
 142   typedef void (APIENTRY * PFNGLPOINTPARAMETERFEXTPROC)(GLenum pname,
 143                                                         GLfloat param);
 144   typedef void (APIENTRY * PFNGLPOINTPARAMETERFVEXTPROC)(GLenum pname,
 145                                                          const GLfloat *params);
 146
 147   PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 148   PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 149 #  elif linux
 150   #include <GL/glx.h>
 151
 152   typedef void (* OpenGLFuncExt)(GLenum pname, GLfloat param);
 153   typedef void (* OpenGLFuncExtv)(GLenum pname, const GLfloat *params);
 154
 155   OpenGLFuncExt glPointParameterfEXT = 0;
 156   OpenGLFuncExtv glPointParameterfvEXT = 0;
 157 #  endif
 158 #endif
 159
 160 float default_attenuation[3] = {1.0, 0.0, 0.0};
 161 //Required for using GL_extensions
 162 void fgLoadDCS (void);
 163 void fgUpdateDCS (void);
 164 ssgSelector *ship_sel=NULL;
 165 // upto 32 instances of a same object can be loaded.
 166 ssgTransform *ship_pos[32];
 167 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 168 int objc=0;
 169 ssgSelector *lightpoints_brightness = new ssgSelector;
 170 ssgTransform *lightpoints_transform = new ssgTransform;
 171 FGTileEntry *dummy_tile;
 172 sgVec3 rway_ols;
 173 // ADA
 174 // Clip plane settings...
 175 float scene_nearplane = 0.5f;
 176 float scene_farplane = 120000.0f;
 177
 178 static double delta_time_sec = 0;
 179
 180
 181 #ifdef FG_WEATHERCM
 182 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 183 #else
 184 #  include <Environment/environment_mgr.hxx>
 185 #endif
 186
 187 #include "version.h"
 188
 189 #include "fg_init.hxx"
 190 #include "fg_io.hxx"
 191 #include "fg_props.hxx"
 192 #include "globals.hxx"
 193 #include "splash.hxx"
 194 #include "viewmgr.hxx"
 195 #include "options.hxx"
 196 #include "logger.hxx"
 197
 198 #ifdef macintosh
 199 #  include <console.h>          // -dw- for command line dialog
 200 #endif
 201
 202
 203 FGEventMgr global_events;
 204
 205 // This is a record containing a bit of global housekeeping information
 206 FGGeneral general;
 207
 208 // Specify our current idle function state.  This is used to run all
 209 // our initializations out of the glutIdleLoop() so that we can get a
 210 // splash screen up and running right away.
 211 static int idle_state = 0;
 212 static long global_multi_loop;
 213
 214 // forward declaration
 215 void fgReshape( int width, int height );
 216
 217 // fog constants.  I'm a little nervous about putting actual code out
 218 // here but it seems to work (?)
 219 static const double m_log01 = -log( 0.01 );
 220 static const double sqrt_m_log01 = sqrt( m_log01 );
 221 static GLfloat fog_exp_density;
 222 static GLfloat fog_exp2_density;
 223 static GLfloat rwy_exp2_punch_through;
 224 static GLfloat taxi_exp2_punch_through;
 225
 226 #ifdef FG_NETWORK_OLK
 227 ssgSelector *fgd_sel = NULL;
 228 ssgTransform *fgd_pos = NULL;
 229 #endif
 230
 231 // Sky structures
 232 SGSky *thesky;
 233 SkySceneLoader *sgClouds3d;
 234 bool _bcloud_orig = true;
 235
 236 // hack
 237 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 238 {
 239   {  1.0f,  0.0f,  0.0f,  0.0f },
 240   {  0.0f,  0.0f, -1.0f,  0.0f },
 241   {  0.0f,  1.0f,  0.0f,  0.0f },
 242   {  0.0f,  0.0f,  0.0f,  1.0f }
 243 };
 244
 245 // The following defines flightgear options. Because glutlib will also
 246 // want to parse its own options, those options must not be included here
 247 // or they will get parsed by the main program option parser. Hence case
 248 // is significant for any option added that might be in conflict with
 249 // glutlib's parser.
 250 //
 251 // glutlib parses for:
 252 //    -display
 253 //    -direct   (invalid in Win32)
 254 //    -geometry
 255 //    -gldebug
 256 //    -iconized
 257 //    -indirect (invalid in Win32)
 258 //    -synce
 259 //
 260 // Note that glutlib depends upon strings while this program's
 261 // option parser wants only initial characters followed by numbers
 262 // or pathnames.
 263 //
 264
 265
 266 ssgSimpleState *cloud3d_imposter_state;
 267 ssgSimpleState *default_state;
 268 ssgSimpleState *hud_and_panel;
 269 ssgSimpleState *menus;
 270
 271 SGTimeStamp last_time_stamp;
 272 SGTimeStamp current_time_stamp;
 273
 274 void fgBuildRenderStates( void ) {
 275     default_state = new ssgSimpleState;
 276     default_state->ref();
 277     default_state->disable( GL_TEXTURE_2D );
 278     default_state->enable( GL_CULL_FACE );
 279     default_state->enable( GL_COLOR_MATERIAL );
 280     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 281     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 282     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 283     default_state->disable( GL_BLEND );
 284     default_state->disable( GL_ALPHA_TEST );
 285     default_state->disable( GL_LIGHTING );
 286
 287     cloud3d_imposter_state = new ssgSimpleState;
 288     cloud3d_imposter_state->ref();
 289     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 290     cloud3d_imposter_state->enable( GL_CULL_FACE );
 291     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 292     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 293     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 294     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 295     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 296     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 297     cloud3d_imposter_state->enable( GL_BLEND );
 298     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 299     cloud3d_imposter_state->disable( GL_LIGHTING );
 300
 301     hud_and_panel = new ssgSimpleState;
 302     hud_and_panel->ref();
 303     hud_and_panel->disable( GL_CULL_FACE );
 304     hud_and_panel->disable( GL_TEXTURE_2D );
 305     hud_and_panel->disable( GL_LIGHTING );
 306     hud_and_panel->enable( GL_BLEND );
 307
 308     menus = new ssgSimpleState;
 309     menus->ref();
 310     menus->disable( GL_CULL_FACE );
 311     menus->disable( GL_TEXTURE_2D );
 312     menus->enable( GL_BLEND );
 313 }
 314
 315
 316 // fgInitVisuals() -- Initialize various GL/view parameters
 317 void fgInitVisuals( void ) {
 318     fgLIGHT *l;
 319
 320     l = &cur_light_params;
 321
 322 #ifndef GLUT_WRONG_VERSION
 323     // Go full screen if requested ...
 324     if ( fgGetBool("/sim/startup/fullscreen") ) {
 325         glutFullScreen();
 326     }
 327 #endif
 328
 329     // If enabled, normal vectors specified with glNormal are scaled
 330     // to unit length after transformation.  Enabling this has
 331     // performance implications.  See the docs for glNormal.
 332     // glEnable( GL_NORMALIZE );
 333
 334     glEnable( GL_LIGHTING );
 335     glEnable( GL_LIGHT0 );
 336     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 337
 338     sgVec3 sunpos;
 339     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 340     ssgGetLight( 0 ) -> setPosition( sunpos );
 341
 342     glFogi (GL_FOG_MODE, GL_EXP2);
 343     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 344          (!fgGetBool("/sim/rendering/shading"))) {
 345         // if fastest fog requested, or if flat shading force fastest
 346         glHint ( GL_FOG_HINT, GL_FASTEST );
 347     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 348         glHint ( GL_FOG_HINT, GL_NICEST );
 349     }
 350     if ( fgGetBool("/sim/rendering/wireframe") ) {
 351         // draw wire frame
 352         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 353     }
 354
 355     // This is the default anyways, but it can't hurt
 356     glFrontFace ( GL_CCW );
 357
 358     // Just testing ...
 359     // glEnable(GL_POINT_SMOOTH);
 360     // glEnable(GL_LINE_SMOOTH);
 361     // glEnable(GL_POLYGON_SMOOTH);
 362 }
 363
 364
 365 // For HiRes screen Dumps using Brian Pauls TR Library
 366 void trRenderFrame( void ) {
 367
 368     if ( fgPanelVisible() ) {
 369         GLfloat height = fgGetInt("/sim/startup/ysize");
 370         GLfloat view_h =
 371             (current_panel->getViewHeight() - current_panel->getYOffset())
 372             * (height / 768.0) + 1;
 373         glTranslatef( 0.0, view_h, 0.0 );
 374     }
 375
 376     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 377     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 378
 379     fgLIGHT *l = &cur_light_params;
 380
 381     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 382                  l->adj_fog_color[2], l->adj_fog_color[3]);
 383
 384     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 385
 386     // set the opengl state to known default values
 387     default_state->force();
 388
 389     glEnable( GL_FOG );
 390     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 391     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 392     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 393
 394     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 395     // we only update GL_AMBIENT for our lights we will never get
 396     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 397     // explicitely to black.
 398     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 399     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 400
 401     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 402
 403     // texture parameters
 404     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 405     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 406
 407     // we need a white diffuse light for the phase of the moon
 408     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 409     thesky->preDraw();
 410
 411     // draw the ssg scene
 412     // return to the desired diffuse color
 413     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 414     glEnable( GL_DEPTH_TEST );
 415     ssgSetNearFar( scene_nearplane, scene_farplane );
 416     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 417
 418     // draw the lights
 419     glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 420     ssgSetNearFar( scene_nearplane, scene_farplane );
 421     ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 422
 423     ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 424
 425     if (fgGetBool("/environment/clouds/status"))
 426       thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 427
 428     globals->get_model_mgr()->draw();
 429     globals->get_aircraft_model()->draw();
 430 }
 431
 432
 433 // Update all Visuals (redraws anything graphics related)
 434 void fgRenderFrame() {
 435
 436     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 437     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 438
 439     // Process/manage pending events
 440     global_events.update( delta_time_sec );
 441
 442     static const SGPropertyNode *longitude
 443         = fgGetNode("/position/longitude-deg");
 444     static const SGPropertyNode *latitude
 445         = fgGetNode("/position/latitude-deg");
 446     static const SGPropertyNode *altitude
 447         = fgGetNode("/position/altitude-ft");
 448     static const SGPropertyNode *groundlevel_nearplane
 449         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 450
 451     // Update the default (kludged) properties.
 452     fgUpdateProps();
 453
 454     FGViewer *current__view = globals->get_current_view();
 455
 456     fgLIGHT *l = &cur_light_params;
 457     static double last_visibility = -9999;
 458
 459     // update fog params
 460     double actual_visibility;
 461     if (fgGetBool("/environment/clouds/status"))
 462         actual_visibility = thesky->get_visibility();
 463     else
 464         actual_visibility = fgGetDouble("/environment/visibility-m");
 465     if ( actual_visibility != last_visibility ) {
 466         last_visibility = actual_visibility;
 467
 468         fog_exp_density = m_log01 / actual_visibility;
 469         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 470         rwy_exp2_punch_through = sqrt_m_log01 / ( actual_visibility * 2.5 );
 471         taxi_exp2_punch_through = sqrt_m_log01 / ( actual_visibility * 1.5 );
 472     }
 473
 474     // double angle;
 475     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 476     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 477     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 478     // GLfloat mat_shininess[] = { 10.0 };
 479     GLbitfield clear_mask;
 480
 481     if ( idle_state != 1000 ) {
 482         // still initializing, draw the splash screen
 483         if ( fgGetBool("/sim/startup/splash-screen") ) {
 484             fgSplashUpdate(0.0);
 485         }
 486         // Keep resetting sim time while the sim is initializing
 487         globals->set_sim_time_sec( 0.0 );
 488     } else {
 489         // idle_state is now 1000 meaning we've finished all our
 490         // initializations and are running the main loop, so this will
 491         // now work without seg faulting the system.
 492
 493         // calculate our current position in cartesian space
 494         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 495
 496         // update view port
 497         fgReshape( fgGetInt("/sim/startup/xsize"),
 498                    fgGetInt("/sim/startup/ysize") );
 499
 500         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 501             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 502             cloud3d_imposter_state->force();
 503             glDisable( GL_FOG );
 504             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 505             glEnable(GL_DEPTH_TEST);
 506             glEnable(GL_BLEND);
 507             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 508
 509             /*
 510             glEnable( GL_TEXTURE_2D );
 511             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 512             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 513             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 514             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 515             */
 516
 517             if ( _bcloud_orig ) {
 518                 Point3D c = globals->get_scenery()->get_center();
 519                 sgClouds3d->Set_Cloud_Orig( &c );
 520                 _bcloud_orig = false;
 521             }
 522             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 523             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 524             glDisable(GL_DEPTH_TEST);
 525         }
 526
 527         clear_mask = GL_DEPTH_BUFFER_BIT;
 528         if ( fgGetBool("/sim/rendering/wireframe") ) {
 529             clear_mask |= GL_COLOR_BUFFER_BIT;
 530         }
 531
 532         if ( fgGetBool("/sim/rendering/skyblend") ) {
 533             if ( fgGetBool("/sim/rendering/textures") ) {
 534                 // glClearColor(black[0], black[1], black[2], black[3]);
 535                 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 536                              l->adj_fog_color[2], l->adj_fog_color[3]);
 537                 clear_mask |= GL_COLOR_BUFFER_BIT;
 538             }
 539         } else {
 540             glClearColor(l->sky_color[0], l->sky_color[1],
 541                          l->sky_color[2], l->sky_color[3]);
 542             clear_mask |= GL_COLOR_BUFFER_BIT;
 543         }
 544         glClear( clear_mask );
 545
 546         // Tell GL we are switching to model view parameters
 547
 548         // I really should create a derived ssg node or use a call
 549         // back or something so that I can draw the sky within the
 550         // ssgCullAndDraw() function, but for now I just mimic what
 551         // ssg does to set up the model view matrix
 552         glMatrixMode(GL_MODELVIEW);
 553         glLoadIdentity();
 554         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 555
 556         // set the opengl state to known default values
 557         default_state->force();
 558
 559         // update fog params if visibility has changed
 560         double visibility_meters = fgGetDouble("/environment/visibility-m");
 561         thesky->set_visibility(visibility_meters);
 562
 563         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 564                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 565                             / (double)fgGetInt("/sim/model-hz") );
 566
 567         // Set correct opengl fog density
 568         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 569
 570         // update the sky dome
 571         if ( fgGetBool("/sim/rendering/skyblend") ) {
 572             /* cout << "thesky->repaint() sky_color = "
 573                  << cur_light_params.sky_color[0] << " "
 574                  << cur_light_params.sky_color[1] << " "
 575                  << cur_light_params.sky_color[2] << " "
 576                  << cur_light_params.sky_color[3] << endl;
 577             cout << "    fog = "
 578                  << cur_light_params.fog_color[0] << " "
 579                  << cur_light_params.fog_color[1] << " "
 580                  << cur_light_params.fog_color[2] << " "
 581                  << cur_light_params.fog_color[3] << endl;
 582             cout << "    sun_angle = " << cur_light_params.sun_angle
 583                  << "    moon_angle = " << cur_light_params.moon_angle
 584                  << endl; */
 585             thesky->repaint( cur_light_params.sky_color,
 586                              cur_light_params.adj_fog_color,
 587                              cur_light_params.sun_angle,
 588                              cur_light_params.moon_angle,
 589                              globals->get_ephem()->getNumPlanets(),
 590                              globals->get_ephem()->getPlanets(),
 591                              globals->get_ephem()->getNumStars(),
 592                              globals->get_ephem()->getStars() );
 593
 594             /* cout << "thesky->reposition( view_pos = " << view_pos[0] << " "
 595                  << view_pos[1] << " " << view_pos[2] << endl;
 596             cout << "    zero_elev = " << zero_elev[0] << " "
 597                  << zero_elev[1] << " " << zero_elev[2]
 598                  << " lon = " << cur_fdm_state->get_Longitude()
 599                  << " lat = " << cur_fdm_state->get_Latitude() << endl;
 600             cout << "    sun_rot = " << cur_light_params.sun_rotation
 601                  << " gst = " << SGTime::cur_time_params->getGst() << endl;
 602             cout << "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 603                  << " sun dec = " << globals->get_ephem()->getSunDeclination()
 604                  << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 605                  << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 606
 607             thesky->reposition( current__view->get_view_pos(),
 608                                 current__view->get_zero_elev(),
 609                                 current__view->get_world_up(),
 610                                 current__view->getLongitude_deg()
 611                                   * SGD_DEGREES_TO_RADIANS,
 612                                 current__view->getLatitude_deg()
 613                                   * SGD_DEGREES_TO_RADIANS,
 614                                 current__view->getAltitudeASL_ft() * SG_FEET_TO_METER,
 615                                 cur_light_params.sun_rotation,
 616                                 globals->get_time_params()->getGst(),
 617                                 globals->get_ephem()->getSunRightAscension(),
 618                                 globals->get_ephem()->getSunDeclination(),
 619                                 50000.0,
 620                                 globals->get_ephem()->getMoonRightAscension(),
 621                                 globals->get_ephem()->getMoonDeclination(),
 622                                 50000.0 );
 623         }
 624
 625         glEnable( GL_DEPTH_TEST );
 626         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 627             glEnable( GL_FOG );
 628             glFogi( GL_FOG_MODE, GL_EXP2 );
 629             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 630         }
 631
 632         // set sun/lighting parameters
 633         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 634
 635         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 636         // we only update GL_AMBIENT for our lights we will never get
 637         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 638         // explicitely to black.
 639         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 640
 641         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 642         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 643         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 644
 645         // texture parameters
 646         // glEnable( GL_TEXTURE_2D );
 647         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 648         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 649
 650         // glMatrixMode( GL_PROJECTION );
 651         // glLoadIdentity();
 652         ssgSetFOV( current__view->get_h_fov(),
 653                    current__view->get_v_fov() );
 654
 655         double agl =
 656             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 657             - globals->get_scenery()->get_cur_elev();
 658
 659         if ( agl > 10.0 ) {
 660             scene_nearplane = 10.0f;
 661             scene_farplane = 120000.0f;
 662         } else {
 663             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 664             scene_farplane = 120000.0f;
 665         }
 666
 667         ssgSetNearFar( scene_nearplane, scene_farplane );
 668
 669         // $$$ begin - added VS Renganthan 17 Oct 2K
 670         if(objc)
 671           fgUpdateDCS();
 672         // $$$ end - added VS Renganthan 17 Oct 2K
 673
 674 # ifdef FG_NETWORK_OLK
 675         if ( fgGetBool("/sim/networking/network-olk") ) {
 676             sgCoord fgdpos;
 677             other = head->next;             /* put listpointer to start  */
 678             while ( other != tail) {        /* display all except myself */
 679                 if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 680                     other->fgd_sel->select(1);
 681                     sgSetCoord( &fgdpos, other->sgFGD_COORD );
 682                     other->fgd_pos->setTransform( &fgdpos );
 683                 }
 684                 other = other->next;
 685             }
 686
 687             // fgd_sel->select(1);
 688             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 689             // sgCoord fgdpos;
 690             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 691             // fgd_pos->setTransform( &fgdpos);
 692         }
 693 # endif
 694
 695         // position tile nodes and update range selectors
 696
 697         // this is done in the main loop now...
 698         // global_tile_mgr.prep_ssg_nodes(visibility_meters);
 699
 700         if ( fgGetBool("/sim/rendering/skyblend") ) {
 701             // draw the sky backdrop
 702
 703             // we need a white diffuse light for the phase of the moon
 704             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 705
 706             thesky->preDraw();
 707
 708             // return to the desired diffuse color
 709             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 710         }
 711
 712         // draw the ssg scene
 713         glEnable( GL_DEPTH_TEST );
 714
 715         ssgSetNearFar( scene_nearplane, scene_farplane );
 716         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 717
 718         // This is a bit kludgy.  Every 200 frames, do an extra
 719         // traversal of the scene graph without drawing anything, but
 720         // with the field-of-view set to 360x360 degrees.  This
 721         // ensures that out-of-range random objects that are not in
 722         // the current view frustum will still be freed properly.
 723         static int counter = 0;
 724         counter++;
 725         if (counter == 200) {
 726           sgFrustum f;
 727           f.setFOV(360, 360);
 728                                 // No need to put the near plane too close;
 729                                 // this way, at least the aircraft can be
 730                                 // culled.
 731           f.setNearFar(1000, 1000000);
 732           sgMat4 m;
 733           ssgGetModelviewMatrix(m);
 734           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 735           counter = 0;
 736         }
 737
 738         // change state for lighting here
 739
 740         // draw runway lighting
 741         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 742         ssgSetNearFar( scene_nearplane, scene_farplane );
 743
 744 #ifdef FG_EXPERIMENTAL_LIGHTING
 745         // Enable states for drawing points with GL_extension
 746         glEnable(GL_POINT_SMOOTH);
 747
 748         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 749             float quadratic[3] = {1.0, 0.001, 0.0000001};
 750             // makes the points fade as they move away
 751             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 752             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 753         }
 754         glPointSize(2.0);
 755
 756         // blending function for runway lights
 757         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 758 #endif
 759
 760         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 761         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 762         glEnable(GL_TEXTURE_GEN_S);
 763         glEnable(GL_TEXTURE_GEN_T);
 764         glPolygonMode(GL_FRONT, GL_POINT);
 765
 766         // draw runway lighting
 767         ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 768
 769         // change punch through and then draw taxi lighting
 770         glFogf (GL_FOG_DENSITY, taxi_exp2_punch_through);
 771         ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 772
 773         // clean up lighting
 774         glPolygonMode(GL_FRONT, GL_FILL);
 775         glDisable(GL_TEXTURE_GEN_S);
 776         glDisable(GL_TEXTURE_GEN_T);
 777
 778         //static int _frame_count = 0;
 779         //if (_frame_count % 30 == 0) {
 780         //  printf("SSG: %s\n", ssgShowStats());
 781         //}
 782         //else {
 783         //  ssgShowStats();
 784         //}
 785         //_frame_count++;
 786
 787
 788 #ifdef FG_EXPERIMENTAL_LIGHTING
 789         if (glutExtensionSupported("GL_EXT_point_parameters")) {
 790             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 791                                   default_attenuation);
 792         }
 793
 794         glPointSize(1.0);
 795         glDisable(GL_POINT_SMOOTH);
 796 #endif
 797
 798         // draw ground lighting
 799         ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 800
 801         if ( fgGetBool("/sim/rendering/skyblend") ) {
 802             // draw the sky cloud layers
 803             if (fgGetBool("/environment/clouds/status")) {
 804                 thesky->postDraw( cur_fdm_state->get_Altitude()
 805                                   * SG_FEET_TO_METER );
 806             }
 807         }
 808
 809         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 810             glDisable( GL_FOG );
 811             glDisable( GL_LIGHTING );
 812             // cout << "drawing new clouds" << endl;
 813
 814             glEnable(GL_DEPTH_TEST);
 815             glEnable(GL_BLEND);
 816             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 817
 818             /*
 819             glEnable( GL_TEXTURE_2D );
 820             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 821             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 822             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 823             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 824             */
 825
 826             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 827             glEnable( GL_FOG );
 828             glEnable( GL_LIGHTING );
 829             glEnable( GL_DEPTH_TEST );
 830             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 831         }
 832
 833         globals->get_model_mgr()->draw();
 834         globals->get_aircraft_model()->draw();
 835
 836         // display HUD && Panel
 837         glDisable( GL_FOG );
 838         glDisable( GL_DEPTH_TEST );
 839         // glDisable( GL_CULL_FACE );
 840         // glDisable( GL_TEXTURE_2D );
 841
 842         // update the controls subsystem
 843         globals->get_controls()->update(delta_time_sec);
 844
 845         hud_and_panel->apply();
 846         fgCockpitUpdate();
 847
 848         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 849         // This only works properly if called before the panel call
 850         globals->get_ATC_display()->update(delta_time_sec);
 851
 852         // update the panel subsystem
 853         if ( current_panel != NULL ) {
 854             current_panel->update(delta_time_sec);
 855         }
 856         fgUpdate3DPanels();
 857
 858         // We can do translucent menus, so why not. :-)
 859         menus->apply();
 860         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 861         puDisplay();
 862         // glDisable ( GL_BLEND ) ;
 863
 864         glEnable( GL_DEPTH_TEST );
 865         glEnable( GL_FOG );
 866
 867     }
 868
 869     glutSwapBuffers();
 870 }
 871
 872
 873 // Update internal time dependent calculations (i.e. flight model)
 874 // FIXME: this distinction is obsolete; all subsystems now get delta
 875 // time on update.
 876 void fgUpdateTimeDepCalcs() {
 877     static bool inited = false;
 878
 879     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 880
 881     fgLIGHT *l = &cur_light_params;
 882
 883     // Initialize the FDM here if it hasn't been and if we have a
 884     // scenery elevation hit.
 885
 886     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 887     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 888
 889     if ( !cur_fdm_state->get_inited() &&
 890          globals->get_scenery()->get_cur_elev() > -9990 )
 891     {
 892         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 893
 894         cur_fdm_state->init();
 895         if ( cur_fdm_state->get_bound() ) {
 896             cur_fdm_state->unbind();
 897         }
 898         cur_fdm_state->bind();
 899     }
 900
 901     // conceptually, the following block could be done for each fdm
 902     // instance ...
 903     if ( !cur_fdm_state->get_inited() ) {
 904         // do nothing, fdm isn't inited yet
 905     } else {
 906         // we have been inited, and  we are good to go ...
 907
 908         if ( !inited ) {
 909             inited = true;
 910         }
 911
 912         globals->get_autopilot()->update(delta_time_sec);
 913         cur_fdm_state->update(delta_time_sec);
 914         globals->get_steam()->update(delta_time_sec);
 915     }
 916
 917     globals->get_model_mgr()->update(delta_time_sec);
 918     globals->get_aircraft_model()->update(delta_time_sec);
 919
 920     // update the view angle
 921     globals->get_viewmgr()->update(delta_time_sec);
 922
 923     l->UpdateAdjFog();
 924
 925     // Update solar system
 926     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 927                                   globals->get_time_params()->getLst(),
 928                                   cur_fdm_state->get_Latitude() );
 929
 930     // Update radio stack model
 931     current_radiostack->update(delta_time_sec);
 932 }
 933
 934
 935 void fgInitTimeDepCalcs( void ) {
 936     // noop for now
 937 }
 938
 939
 940 static const double alt_adjust_ft = 3.758099;
 941 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 942
 943
 944 // What should we do when we have nothing else to do?  Let's get ready
 945 // for the next move and update the display?
 946 static void fgMainLoop( void ) {
 947
 948     static const SGPropertyNode *longitude
 949         = fgGetNode("/position/longitude-deg");
 950     static const SGPropertyNode *latitude
 951         = fgGetNode("/position/latitude-deg");
 952     static const SGPropertyNode *altitude
 953         = fgGetNode("/position/altitude-ft");
 954     static const SGPropertyNode *clock_freeze
 955         = fgGetNode("/sim/freeze/clock", true);
 956     static const SGPropertyNode *cur_time_override
 957         = fgGetNode("/sim/time/cur-time-override", true);
 958
 959     // Update the elapsed time.
 960     static bool first_time = true;
 961     if ( first_time ) {
 962         last_time_stamp.stamp();
 963         first_time = false;
 964     }
 965     current_time_stamp.stamp();
 966     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 967     if (clock_freeze->getBoolValue())
 968         delta_time_sec = 0;
 969     last_time_stamp = current_time_stamp;
 970     globals->inc_sim_time_sec( delta_time_sec );
 971
 972     static long remainder = 0;
 973     long elapsed;
 974 #ifdef FANCY_FRAME_COUNTER
 975     int i;
 976     double accum;
 977 #else
 978     static time_t last_time = 0;
 979     static int frames = 0;
 980 #endif // FANCY_FRAME_COUNTER
 981
 982     SGTime *t = globals->get_time_params();
 983
 984     FGLocation * acmodel_location = 0;
 985     if(cur_fdm_state->getACModel() != 0) {
 986       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
 987     }
 988
 989     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
 990     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
 991
 992 #ifdef FG_NETWORK_OLK
 993     if ( fgGetBool("/sim/networking/network-olk") ) {
 994         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
 995             // printf("FGD: Netupdate\n");
 996             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
 997             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
 998         }
 999     }
1000 #endif
1001
1002 #if defined( ENABLE_PLIB_JOYSTICK )
1003     // Read joystick and update control settings
1004     // if ( fgGetString("/sim/control-mode") == "joystick" )
1005     // {
1006     //    fgJoystickRead();
1007     // }
1008 #elif defined( ENABLE_GLUT_JOYSTICK )
1009     // Glut joystick support works by feeding a joystick handler
1010     // function to glut.  This is taken care of once in the joystick
1011     // init routine and we don't have to worry about it again.
1012 #endif
1013
1014 #ifndef FG_WEATHERCM
1015     globals->get_environment_mgr()->update(delta_time_sec);
1016 #endif
1017
1018     // Fix elevation.  I'm just sticking this here for now, it should
1019     // probably move eventually
1020
1021     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
1022            scenery.get_cur_elev(),
1023            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1024            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1025
1026 // Curt is this code used?  I don't see any problems when I comment it out.
1027     if ( acmodel_location != 0 ) {
1028       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
1029         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
1030              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
1031             // now set aircraft altitude above ground
1032             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
1033                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
1034                    acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
1035                    acmodel_location->get_cur_elev_m() + alt_adjust_m );
1036             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
1037                                                 + alt_adjust_m) * SG_METER_TO_FEET );
1038             SG_LOG( SG_ALL, SG_DEBUG,
1039                     "<*> resetting altitude to "
1040                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
1041                     << " meters" );
1042         }
1043       }
1044     }
1045 // End of code in question. (see Curt is this code used? above)
1046
1047     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
1048            scenery.get_cur_elev(),
1049            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1050            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1051
1052     // cout << "Warp = " << globals->get_warp() << endl;
1053
1054     // update "time"
1055     static bool last_clock_freeze = false;
1056
1057     if ( clock_freeze->getBoolValue() ) {
1058         // clock freeze requested
1059         if ( cur_time_override->getLongValue() == 0 ) {
1060             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
1061             globals->set_warp( 0 );
1062         }
1063     } else {
1064         // no clock freeze requested
1065         if ( last_clock_freeze == true ) {
1066             // clock just unfroze, let's set warp as the difference
1067             // between frozen time and current time so we don't get a
1068             // time jump (and corresponding sky object and lighting
1069             // jump.)
1070             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
1071             fgSetLong( "/sim/time/cur-time-override", 0 );
1072         }
1073         if ( globals->get_warp_delta() != 0 ) {
1074             globals->inc_warp( globals->get_warp_delta() );
1075         }
1076     }
1077
1078     last_clock_freeze = clock_freeze->getBoolValue();
1079
1080     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1081                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1082                cur_time_override->getLongValue(),
1083                globals->get_warp() );
1084
1085     if ( globals->get_warp_delta() != 0 ) {
1086         fgUpdateSkyAndLightingParams();
1087     }
1088
1089     // update magvar model
1090     globals->get_mag()->update( longitude->getDoubleValue()
1091                                   * SGD_DEGREES_TO_RADIANS,
1092                                 latitude->getDoubleValue()
1093                                   * SGD_DEGREES_TO_RADIANS,
1094                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
1095                                 globals->get_time_params()->getJD() );
1096
1097     // Get elapsed time (in usec) for this past frame
1098     elapsed = fgGetTimeInterval();
1099     SG_LOG( SG_ALL, SG_DEBUG,
1100             "Elapsed time interval is = " << elapsed
1101             << ", previous remainder is = " << remainder );
1102
1103     // Calculate frame rate average
1104 #ifdef FANCY_FRAME_COUNTER
1105     /* old fps calculation */
1106     if ( elapsed > 0 ) {
1107         double tmp;
1108         accum = 0.0;
1109         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1110             tmp = general.get_frame(i);
1111             accum += tmp;
1112             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1113             general.set_frame(i+1,tmp);
1114         }
1115         tmp = 1000000.0 / (float)elapsed;
1116         general.set_frame(0,tmp);
1117         // printf("frame[0] = %.2f\n", general.frames[0]);
1118         accum += tmp;
1119         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1120         // printf("ave = %.2f\n", general.frame_rate);
1121     }
1122 #else
1123     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1124         general.set_frame_rate( frames );
1125         SG_LOG( SG_ALL, SG_DEBUG,
1126                 "--> Frame rate is = " << general.get_frame_rate() );
1127         frames = 0;
1128     }
1129     last_time = t->get_cur_time();
1130     ++frames;
1131 #endif
1132
1133     // Run ATC subsystem
1134     globals->get_ATC_mgr()->update(delta_time_sec);
1135
1136     // Run the AI subsystem
1137     if (fgGetBool("/sim/ai-traffic/enabled"))
1138         globals->get_AI_mgr()->update(delta_time_sec);
1139
1140     // Run flight model
1141
1142     // Calculate model iterations needed for next frame
1143     elapsed += remainder;
1144
1145     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1146                               fgGetInt("/sim/model-hz"));
1147     remainder = elapsed - ( (global_multi_loop*1000000) /
1148                             fgGetInt("/sim/model-hz") );
1149     SG_LOG( SG_ALL, SG_DEBUG,
1150             "Model iterations needed = " << global_multi_loop
1151             << ", new remainder = " << remainder );
1152
1153     // chop max interations to something reasonable if the sim was
1154     // delayed for an excesive amount of time
1155     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1156         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1157         remainder = 0;
1158     }
1159
1160     // flight model
1161     if ( global_multi_loop > 0 ) {
1162         fgUpdateTimeDepCalcs();
1163     } else {
1164         SG_LOG( SG_ALL, SG_DEBUG,
1165                 "Elapsed time is zero ... we're zinging" );
1166     }
1167
1168     // Do any I/O channel work that might need to be done
1169     globals->get_io()->update( delta_time_sec );
1170
1171     // see if we need to load any deferred-load textures
1172     material_lib.load_next_deferred();
1173
1174     // Run audio scheduler
1175 #ifdef ENABLE_AUDIO_SUPPORT
1176     if ( fgGetBool("/sim/sound/audible")
1177            && globals->get_soundmgr()->is_working() ) {
1178         globals->get_soundmgr()->update( delta_time_sec );
1179     }
1180 #endif
1181
1182     globals->get_subsystem_mgr()->update(delta_time_sec);
1183
1184     //
1185     // Tile Manager updates - see if we need to load any new scenery tiles.
1186     //   this code ties together the fdm, viewer and scenery classes...
1187     //   we may want to move this to it's own class at some point
1188     //
1189     double visibility_meters = fgGetDouble("/environment/visibility-m");
1190     FGViewer *current_view = globals->get_current_view();
1191
1192     // update tile manager for FDM...
1193     // ...only if location is different than the viewer (to avoid duplicating effort)
1194     if( acmodel_location != current_view->getFGLocation() ) {
1195       if( acmodel_location != 0 ) {
1196         global_tile_mgr.prep_ssg_nodes(visibility_meters,
1197                acmodel_location->get_world_up(),
1198                acmodel_location->get_tile_center());
1199         global_tile_mgr.update( acmodel_location->getLongitude_deg(),
1200                             acmodel_location->getLatitude_deg(),
1201                             visibility_meters,
1202                             acmodel_location->get_absolute_view_pos(),
1203                             acmodel_location->get_current_bucket(),
1204                             acmodel_location->get_previous_bucket(),
1205                             acmodel_location->get_tile_center()
1206                             );
1207         // save results of update in FGLocation for fdm...
1208         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1209           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1210         }
1211         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1212         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1213         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1214       }
1215     }
1216
1217     global_tile_mgr.prep_ssg_nodes(visibility_meters,
1218        current_view->getFGLocation()->get_world_up(),
1219        current_view->getFGLocation()->get_tile_center());
1220     // update tile manager for view...
1221     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1222     // after the FDM's until all of Flight Gear code references the viewer's location
1223     // for elevation instead of the "scenery's" current elevation.
1224     global_tile_mgr.update( current_view->getLongitude_deg(),
1225                             current_view->getLatitude_deg(),
1226                             visibility_meters,
1227                             current_view->get_absolute_view_pos(),
1228                             current_view->getFGLocation()->get_current_bucket(),
1229                             current_view->getFGLocation()->get_previous_bucket(),
1230                             current_view->getFGLocation()->get_tile_center()
1231                             );
1232     // save results of update in FGLocation for fdm...
1233     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1234       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1235     }
1236     current_view->getFGLocation()->set_current_bucket( global_tile_mgr.get_current_bucket() );
1237     current_view->getFGLocation()->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1238     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1239
1240     // If fdm location is same as viewer's then we didn't do the update for fdm location
1241     //   above so we need to save the viewer results in the fdm FGLocation as well...
1242     if( acmodel_location == current_view->getFGLocation() ) {
1243       if( acmodel_location != 0 ) {
1244         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1245           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1246         }
1247         acmodel_location->set_current_bucket( global_tile_mgr.get_current_bucket() );
1248         acmodel_location->set_previous_bucket( global_tile_mgr.get_previous_bucket() );
1249         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1250       }
1251     }
1252
1253     // END Tile Manager udpates
1254
1255     // redraw display
1256     fgRenderFrame();
1257
1258     SG_LOG( SG_ALL, SG_DEBUG, "" );
1259 }
1260
1261
1262 // This is the top level master main function that is registered as
1263 // our idle funciton
1264
1265 // The first few passes take care of initialization things (a couple
1266 // per pass) and once everything has been initialized fgMainLoop from
1267 // then on.
1268
1269 static void fgIdleFunction ( void ) {
1270     // printf("idle state == %d\n", idle_state);
1271
1272     if ( idle_state == 0 ) {
1273         // Initialize the splash screen right away
1274         if ( fgGetBool("/sim/startup/splash-screen") ) {
1275             fgSplashInit();
1276         }
1277
1278         idle_state++;
1279     } else if ( idle_state == 1 ) {
1280         // Initialize audio support
1281 #ifdef ENABLE_AUDIO_SUPPORT
1282
1283         // Start the intro music
1284         if ( fgGetBool("/sim/startup/intro-music") ) {
1285             SGPath mp3file( globals->get_fg_root() );
1286             mp3file.append( "Sounds/intro.mp3" );
1287
1288             SG_LOG( SG_GENERAL, SG_INFO,
1289                     "Starting intro music: " << mp3file.str() );
1290
1291 #if defined( __CYGWIN__ )
1292             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1293 #elif defined( WIN32 )
1294             string command = "start /m " + mp3file.str();
1295 #else
1296             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1297 #endif
1298
1299             system ( command.c_str() );
1300         }
1301 #endif
1302
1303         idle_state++;
1304     } else if ( idle_state == 2 ) {
1305         // These are a few miscellaneous things that aren't really
1306         // "subsystems" but still need to be initialized.
1307
1308 #ifdef USE_GLIDE
1309         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1310             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1311         }
1312 #endif
1313
1314         idle_state++;
1315     } else if ( idle_state == 3 ) {
1316         // This is the top level init routine which calls all the
1317         // other subsystem initialization routines.  If you are adding
1318         // a subsystem to flightgear, its initialization call should
1319         // located in this routine.
1320         if( !fgInitSubsystems()) {
1321             SG_LOG( SG_GENERAL, SG_ALERT,
1322                     "Subsystem initializations failed ..." );
1323             exit(-1);
1324         }
1325
1326         idle_state++;
1327     } else if ( idle_state == 4 ) {
1328         // setup OpenGL view parameters
1329         fgInitVisuals();
1330
1331         idle_state++;
1332     } else if ( idle_state == 5 ) {
1333
1334         idle_state++;
1335     } else if ( idle_state == 6 ) {
1336         // sleep(1);
1337         idle_state = 1000;
1338
1339         SG_LOG( SG_GENERAL, SG_INFO, "Panel visible = " << fgPanelVisible() );
1340         fgReshape( fgGetInt("/sim/startup/xsize"),
1341                    fgGetInt("/sim/startup/ysize") );
1342     }
1343
1344     if ( idle_state == 1000 ) {
1345         // We've finished all our initialization steps, from now on we
1346         // run the main loop.
1347
1348         glutIdleFunc(fgMainLoop);
1349     } else {
1350         if ( fgGetBool("/sim/startup/splash-screen") ) {
1351             fgSplashUpdate(0.0);
1352         }
1353     }
1354 }
1355
1356 // options.cxx needs to see this for toggle_panel()
1357 // Handle new window size or exposure
1358 void fgReshape( int width, int height ) {
1359     int view_h;
1360
1361     if ( (!fgGetBool("/sim/virtual-cockpit"))
1362          && fgPanelVisible() && idle_state == 1000 ) {
1363         view_h = (int)(height * (current_panel->getViewHeight() -
1364                                  current_panel->getYOffset()) / 768.0);
1365     } else {
1366         view_h = height;
1367     }
1368
1369     // for all views
1370     FGViewMgr *viewmgr = globals->get_viewmgr();
1371     for ( int i = 0; i < viewmgr->size(); ++i ) {
1372       viewmgr->get_view(i)->
1373         set_aspect_ratio((float)view_h / (float)width);
1374     }
1375
1376     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1377
1378     fgSetInt("/sim/startup/xsize", width);
1379     fgSetInt("/sim/startup/ysize", height);
1380     guiInitMouse(width, height);
1381
1382     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1383                viewmgr->get_current_view()->get_v_fov() );
1384
1385     fgHUDReshape();
1386     sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
1387                         viewmgr->get_current_view()->get_v_fov() );
1388 }
1389
1390 // Initialize GLUT and define a main window
1391 static bool fgGlutInit( int *argc, char **argv ) {
1392
1393 #if !defined( macintosh )
1394     // GLUT will extract all glut specific options so later on we only
1395     // need wory about our own.
1396     glutInit(argc, argv);
1397 #endif
1398
1399     // Define Display Parameters. Clouds3d works best with --bpp32 option
1400     if ( fgGetBool("/sim/rendering/clouds3d") ) {
1401         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_ALPHA );
1402     } else {
1403         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1404     }
1405
1406     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1407             fgGetInt("/sim/startup/xsize") << "x"
1408             << fgGetInt("/sim/startup/ysize") );
1409
1410     // Define initial window size
1411     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1412                         fgGetInt("/sim/startup/ysize") );
1413
1414     // Initialize windows
1415     if ( !fgGetBool("/sim/startup/game-mode")) {
1416         // Open the regular window
1417         glutCreateWindow("FlightGear");
1418 #ifndef GLUT_WRONG_VERSION
1419     } else {
1420         // Open the cool new 'game mode' window
1421         char game_mode_str[256];
1422 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1423 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1424 #ifndef ENUM_CURRENT_SETTINGS
1425 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1426 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1427 #endif
1428
1429         DEVMODE dm;
1430         dm.dmSize = sizeof(DEVMODE);
1431         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1432         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1433         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1434         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1435                                                 fgGetInt("/sim/startup/ysize") );
1436         sprintf( game_mode_str, "%dx%d:%d@%d",
1437                          dm.dmPelsWidth,
1438                          dm.dmPelsHeight,
1439                          dm.dmBitsPerPel,
1440                          dm.dmDisplayFrequency );
1441 #else
1442         // Open the cool new 'game mode' window
1443         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1444                  fgGetInt("/sim/startup/xsize"),
1445                  fgGetInt("/sim/startup/ysize"),
1446                  fgGetInt("/sim/rendering/bits-per-pixel"));
1447
1448 #endif // HAVE_WINDOWS_H
1449         SG_LOG( SG_GENERAL, SG_INFO,
1450                 "game mode params = " << game_mode_str );
1451         glutGameModeString( game_mode_str );
1452         glutEnterGameMode();
1453 #endif // GLUT_WRONG_VERSION
1454     }
1455
1456     // This seems to be the absolute earliest in the init sequence
1457     // that these calls will return valid info.  Too bad it's after
1458     // we've already created and sized out window. :-(
1459     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1460     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1461     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1462     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1463
1464     GLint tmp;
1465     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1466     general.set_glMaxTexSize( tmp );
1467     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1468
1469     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1470     general.set_glDepthBits( tmp );
1471     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1472
1473     return true;
1474 }
1475
1476
1477 // Initialize GLUT event handlers
1478 static bool fgGlutInitEvents( void ) {
1479     // call fgReshape() on window resizes
1480     glutReshapeFunc( fgReshape );
1481
1482     // keyboard and mouse callbacks are set in FGInput::init
1483
1484     // call fgMainLoop() whenever there is
1485     // nothing else to do
1486     glutIdleFunc( fgIdleFunction );
1487
1488     // draw the scene
1489     glutDisplayFunc( fgRenderFrame );
1490
1491     return true;
1492 }
1493
1494 // Main top level initialization
1495 static bool fgMainInit( int argc, char **argv ) {
1496
1497 #if defined( macintosh )
1498     freopen ("stdout.txt", "w", stdout );
1499     freopen ("stderr.txt", "w", stderr );
1500     argc = ccommand( &argv );
1501 #endif
1502
1503     // set default log levels
1504     sglog().setLogLevels( SG_ALL, SG_INFO );
1505
1506     string version;
1507 #ifdef FLIGHTGEAR_VERSION
1508     version = FLIGHTGEAR_VERSION;
1509 #else
1510     version = "unknown version";
1511 #endif
1512     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1513             << version );
1514     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1515
1516     // Allocate global data structures.  This needs to happen before
1517     // we parse command line options
1518
1519     globals = new FGGlobals;
1520
1521 #ifndef FG_WEATHERCM
1522     globals->set_environment_mgr(new FGEnvironmentMgr);
1523 #endif
1524
1525     // seed the random number generater
1526     sg_srandom_time();
1527
1528     SGRoute *route = new SGRoute;
1529     globals->set_route( route );
1530
1531     FGControls *controls = new FGControls;
1532     globals->set_controls( controls );
1533
1534     FGSteam *steam = new FGSteam;
1535     globals->set_steam( steam );
1536
1537     string_list *col = new string_list;
1538     globals->set_channel_options_list( col );
1539
1540     // Scan the config file(s) and command line options to see if
1541     // fg_root was specified (ignore all other options for now)
1542     fgInitFGRoot(argc, argv);
1543
1544     // Check for the correct base package version
1545     static char required_version[] = "0.9.0";
1546     string base_version = fgBasePackageVersion();
1547     if ( !(base_version == required_version) ) {
1548         // tell the operator how to use this application
1549
1550         cerr << endl << "Base package check failed ... " \
1551              << "Found version " << base_version << " at: " \
1552              << globals->get_fg_root() << endl;
1553         cerr << "Please upgrade to version" << required_version << endl;
1554         exit(-1);
1555     }
1556
1557     // Initialize the Aircraft directory to "" (UIUC)
1558     aircraft_dir = "";
1559
1560     // Load the configuration parameters.  (Command line options
1561     // overrides config file options.  Config file options override
1562     // defaults.)
1563     if ( !fgInitConfig(argc, argv) ) {
1564         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1565         exit(-1);
1566     }
1567
1568     // Initialize the Window/Graphics environment.
1569     if( !fgGlutInit(&argc, argv) ) {
1570         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1571         exit(-1);
1572     }
1573
1574     // Initialize the various GLUT Event Handlers.
1575     if( !fgGlutInitEvents() ) {
1576         SG_LOG( SG_GENERAL, SG_ALERT,
1577                 "GLUT event handler initialization failed ..." );
1578         exit(-1);
1579     }
1580
1581     // Initialize plib net interface
1582     netInit( &argc, argv );
1583
1584     // Initialize ssg (from plib).  Needs to come before we do any
1585     // other ssg stuff, but after opengl/glut has been initialized.
1586     ssgInit();
1587
1588     // Initialize the user interface (we need to do this before
1589     // passing off control to glut and before fgInitGeneral to get our
1590     // fonts !!!
1591     guiInit();
1592
1593 #ifdef GL_EXT_texture_lod_bias
1594     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1595 #endif
1596
1597 #ifdef FG_EXPERIMENTAL_LIGHTING
1598             // get the address of our OpenGL extensions
1599 #  ifdef WIN32
1600     glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
1601         wglGetProcAddress("glPointParameterfEXT");
1602     glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
1603         wglGetProcAddress("glPointParameterfvEXT");
1604 #  elif linux
1605     glPointParameterfEXT = (OpenGLFuncExt)
1606         glXGetProcAddressARB((GLubyte *)"glPointParameterfEXT");
1607     glPointParameterfvEXT = (OpenGLFuncExtv)
1608         glXGetProcAddressARB((GLubyte *)"glPointParameterfvEXT");
1609 #  endif
1610 #endif
1611
1612     // Set position relative to glide slope if requested
1613     fgSetPosFromGlideSlope();
1614
1615     // If we have an explicit, in-range lon/lat, use it.
1616     // If not, check for an airport-id and use that.
1617     // If not, default to the middle of the KSFO field.
1618     // The default values for lon/lat are deliberately out of range
1619     // so that the airport-id can take effect; valid lon/lat will
1620     // override airport-id, however.
1621     double lon_deg = fgGetDouble("/position/longitude-deg");
1622     double lat_deg = fgGetDouble("/position/latitude-deg");
1623     if (lon_deg < -180 || lon_deg > 180 || lat_deg < -90 || lat_deg > 90) {
1624       if ( fgGetString("/sim/presets/airport-id")[0] != '\0' ) {
1625         fgSetPosFromAirportIDandHdg( fgGetString("/sim/presets/airport-id"),
1626                                      fgGetDouble("/sim/presets/heading-deg") );
1627         // set tower position (a little off the heading for single
1628         // runway airports)
1629         fgSetTowerPosFromAirportID( fgGetString("/sim/presets/airport-id"),
1630                                     fgGetDouble("/sim/presets/heading-deg") );
1631       } else {
1632                                 // Default to middle of KSFO field
1633         fgSetDouble("/sim/presets/longitude-deg", -122.374843);
1634         fgSetDouble("/sim/presets/latitude-deg", 37.619002);
1635       }
1636     }
1637
1638     SGTime *t = fgInitTime();
1639     globals->set_time_params( t );
1640
1641     // Do some quick general initializations
1642     if( !fgInitGeneral()) {
1643         SG_LOG( SG_GENERAL, SG_ALERT,
1644                 "General initializations failed ..." );
1645         exit(-1);
1646     }
1647
1648     SGPath modelpath( globals->get_fg_root() );
1649     ssgModelPath( (char *)modelpath.c_str() );
1650
1651     // Initialize the global scenery manager
1652     globals->set_scenery( new FGScenery );
1653     globals->get_scenery()->init();
1654     globals->get_scenery()->bind();
1655
1656     ////////////////////////////////////////////////////////////////////
1657     // Initialize the property-based built-in commands
1658     ////////////////////////////////////////////////////////////////////
1659     fgInitCommands();
1660
1661     ////////////////////////////////////////////////////////////////////
1662     // Initialize the general model subsystem.
1663     ////////////////////////////////////////////////////////////////////
1664
1665     globals->set_model_loader(new FGModelLoader);
1666     globals->set_texture_loader(new FGTextureLoader);
1667     globals->set_model_mgr(new FGModelMgr);
1668     globals->get_model_mgr()->init();
1669     globals->get_model_mgr()->bind();
1670
1671     ////////////////////////////////////////////////////////////////////
1672     // Initialize the 3D aircraft model subsystem.
1673     ////////////////////////////////////////////////////////////////////
1674
1675     globals->set_aircraft_model(new FGAircraftModel);
1676     globals->get_aircraft_model()->init();
1677     globals->get_aircraft_model()->bind();
1678
1679     ////////////////////////////////////////////////////////////////////
1680     // Initialize the view manager subsystem.
1681     ////////////////////////////////////////////////////////////////////
1682
1683     FGViewMgr *viewmgr = new FGViewMgr;
1684     globals->set_viewmgr( viewmgr );
1685     viewmgr->init();
1686     viewmgr->bind();
1687
1688
1689     // Initialize the sky
1690     SGPath ephem_data_path( globals->get_fg_root() );
1691     ephem_data_path.append( "Astro" );
1692     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1693     ephem->update( globals->get_time_params()->getMjd(),
1694                    globals->get_time_params()->getLst(),
1695                    0.0 );
1696     globals->set_ephem( ephem );
1697
1698                                 // TODO: move to environment mgr
1699     thesky = new SGSky;
1700     SGPath texture_path(globals->get_fg_root());
1701     texture_path.append("Textures");
1702     texture_path.append("Sky");
1703     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1704       SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1705       thesky->add_cloud_layer(layer);
1706     }
1707
1708
1709     SGPath sky_tex_path( globals->get_fg_root() );
1710     sky_tex_path.append( "Textures" );
1711     sky_tex_path.append( "Sky" );
1712     thesky->texture_path( sky_tex_path.str() );
1713
1714     thesky->build( 550.0, 550.0,
1715                    globals->get_ephem()->getNumPlanets(),
1716                    globals->get_ephem()->getPlanets(), 60000.0,
1717                    globals->get_ephem()->getNumStars(),
1718                    globals->get_ephem()->getStars(), 60000.0 );
1719
1720     // Initialize MagVar model
1721     SGMagVar *magvar = new SGMagVar();
1722     globals->set_mag( magvar );
1723
1724     // airport = new ssgBranch;
1725     // airport->setName( "Airport Lighting" );
1726     // lighting->addKid( airport );
1727
1728     // ADA
1729     fgLoadDCS();
1730     // ADA
1731
1732 #ifdef FG_NETWORK_OLK
1733     // Do the network intialization
1734     if ( fgGetBool("/sim/networking/network-olk") ) {
1735         printf("Multipilot mode %s\n",
1736                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1737     }
1738 #endif
1739
1740     // build our custom render states
1741     fgBuildRenderStates();
1742
1743     // pass control off to the master GLUT event handler
1744     glutMainLoop();
1745
1746     // we never actually get here ... but to avoid compiler warnings,
1747     // etc.
1748     return false;
1749 }
1750
1751
1752 // $$$ end - added VS Renganathan, 15 Oct 2K
1753 //         - added Venky         , 12 Nov 2K
1754
1755 #if defined(__linux__) && defined(__i386__)
1756
1757 static void handleFPE (int);
1758
1759 static void
1760 initFPE ()
1761 {
1762     fpu_control_t fpe_flags = 0;
1763     _FPU_GETCW(fpe_flags);
1764 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1765 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1766 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1767 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1768 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1769 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1770     _FPU_SETCW(fpe_flags);
1771     signal(SIGFPE, handleFPE);
1772 }
1773
1774 static void
1775 handleFPE (int num)
1776 {
1777   initFPE();
1778   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1779 }
1780 #endif
1781
1782 #ifdef __APPLE__
1783
1784 typedef struct
1785 {
1786   int  lo;
1787   int  hi;
1788 } PSN;
1789
1790 extern "C" {
1791   short CPSGetCurrentProcess(PSN *psn);
1792   short CPSSetProcessName (PSN *psn, char *processname);
1793   short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
1794   short CPSSetFrontProcess(PSN *psn);
1795 };
1796
1797 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
1798
1799 #endif
1800
1801 // Main entry point; catch any exceptions that have made it this far.
1802 int main ( int argc, char **argv ) {
1803
1804     // Enable floating-point exceptions for Linux/x86
1805 #if defined(__linux__) && defined(__i386__)
1806     initFPE();
1807 #endif
1808
1809     // Enable floating-point exceptions for Windows
1810 #if defined( _MSC_VER ) && defined( DEBUG )
1811     // Christian, we should document what this does
1812     _control87( _EM_INEXACT, _MCW_EM );
1813 #endif
1814
1815 #if defined( HAVE_BC5PLUS )
1816     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1817 #endif
1818
1819     // Keyboard focus hack
1820 #ifdef __APPLE__
1821     {
1822       PSN psn;
1823
1824       glutInit (&argc, argv);
1825
1826       CPSGetCurrentProcess(&psn);
1827       CPSSetProcessName(&psn, "FlightGear");
1828       CPSEnableFG(&psn);
1829       CPSSetFrontProcess(&psn);
1830     }
1831 #endif
1832
1833     // FIXME: add other, more specific
1834     // exceptions.
1835     try {
1836         fgMainInit(argc, argv);
1837     } catch (sg_throwable &t) {
1838                                 // We must use cerr rather than
1839                                 // logging, since logging may be
1840                                 // disabled.
1841         cerr << "Fatal error: " << t.getFormattedMessage()
1842              << "\n (received from " << t.getOrigin() << ')' << endl;
1843         exit(1);
1844     }
1845
1846     return 0;
1847 }
1848
1849
1850 void fgLoadDCS(void) {
1851
1852     ssgEntity *ship_obj = NULL;
1853
1854     char obj_filename[25];
1855
1856     for ( int k = 0; k < 32; k++ ) {
1857         ship_pos[k]=NULL;
1858     }
1859
1860     SGPath tile_path( globals->get_fg_root());
1861     tile_path.append( "Scenery" );
1862     tile_path.append( "Objects.txt" );
1863     sg_gzifstream in( tile_path.str() );
1864     if ( ! in.is_open() ) {
1865         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1866     } else {
1867
1868         SGPath modelpath( globals->get_fg_root() );
1869         modelpath.append( "Models" );
1870         modelpath.append( "Geometry" );
1871
1872         SGPath texturepath( globals->get_fg_root() );
1873         texturepath.append( "Models" );
1874         texturepath.append( "Textures" );
1875
1876         ssgModelPath( (char *)modelpath.c_str() );
1877         ssgTexturePath( (char *)texturepath.c_str() );
1878
1879         ship_sel = new ssgSelector;
1880
1881         char c;
1882         while ( ! in.eof() ) {
1883             in >> ::skipws;
1884             if ( in.get( c ) && c == '#' ) {
1885                 in >> skipeol;
1886             } else {
1887                 in.putback(c);
1888                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1889                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1890                    int chj=getchar();*/
1891
1892                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1893                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1894
1895                 ship_pos[objc] = new ssgTransform;
1896
1897                 // type "repeat" in objects.txt to load one more
1898                 // instance of the last object.
1899
1900                 if ( strcmp(obj_filename,"repeat") != 0) {
1901                     ship_obj =
1902                         globals->get_model_loader()->load_model( obj_filename );
1903                 }
1904
1905                 if ( ship_obj != NULL ) {
1906                                         ship_obj->setName(obj_filename);
1907                                 if (objc == 0)
1908                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1909                                         else
1910                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1911                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1912                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1913                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1914                             << obj_filename );
1915                 } else {
1916                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1917                             << obj_filename );
1918                 }
1919
1920                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1921                                 //const char *extn = file_extension ( obj_filename ) ;
1922                                 if ( objc == 1 ){
1923                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1924                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1925                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1926                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1927                                         int ltype[500], light_type;
1928                                         static int ltcount = 0;
1929                                     string token;
1930                                         sgVec3 rway_dir,rway_normal,lightpt;
1931                                         Point3D node;
1932                                         modelpath.append(obj_filename);
1933                                         sg_gzifstream in1( modelpath.str() );
1934                                         if ( ! in1.is_open() ) {
1935                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1936                                         } else {
1937                                                 while ( ! in1.eof() ) {
1938                                                         in1 >> ::skipws;
1939                                                         if ( in1.get( c ) && c == '#' ) {
1940                                                                 in1 >> skipeol;
1941                                                         } else {
1942                                                                 in1.putback(c);
1943                                                                 in1 >> token;
1944                                                                 //cout << token << endl;
1945                                                                 if ( token == "runway" ) {
1946                                                                         in1 >> node;
1947                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1948                                                                 } else if ( token == "edgelight" ) {
1949                                                                         in1 >> node;
1950                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1951                                                                         light_type = 1;
1952                                                                 } else if ( token == "taxi" ) {
1953                                                                         in1 >> node;
1954                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1955                                                                         light_type = 2;
1956                                                                 } else if ( token == "vasi" ) {
1957                                                                         in1 >> node;
1958                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1959                                                                         light_type = 3;
1960                                                                 } else if ( token == "threshold" ) {
1961                                                                         in1 >> node;
1962                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1963                                                                         light_type = 4;
1964                                                                 } else if ( token == "rabbit" ) {
1965                                                                         in1 >> node;
1966                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1967                                                                         light_type = 5;
1968                                                                 } else if ( token == "ols" ) {
1969                                                                         in1 >> node;
1970                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1971                                                                         light_type = 6;
1972                                                                 } else if ( token == "red" ) {
1973                                                                         in1 >> node;
1974                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1975                                                                         light_type = 7;
1976                                                                 } else if ( token == "green" ) {
1977                                                                         in1 >> node;
1978                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1979                                                                         light_type = 8;
1980                                                                 } else if ( token == "lp" ) {
1981                                                                         in1 >> node;
1982                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1983                                                                         lightpoints->add( lightpt );
1984                                                                         lightnormals->add( rway_normal );
1985                                                                         lightdir->add( rway_dir );
1986                                                                         ltype[ltcount]= light_type;
1987                                                                         ltcount++;
1988                                                                 }
1989                                                                 if (in1.eof()) break;
1990                                                         }
1991                                                 }  //while
1992
1993                                                 if ( lightpoints->getNum() ) {
1994                                                         ssgBranch *lightpoints_branch;
1995                                                         long int dummy = -999;
1996                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1997                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1998                                                         dummy_tile->ols_transform = new ssgTransform;
1999
2000                                                         // call function to generate the runway lights
2001                                                         lightpoints_branch =
2002                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
2003                                                                                                                                 lightdir, ltype);
2004                                                         lightpoints_brightness->addKid(lightpoints_branch);
2005                                                         lightpoints_transform->addKid(lightpoints_brightness);
2006                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
2007                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
2008                                                         lightpoints_transform->ref();
2009                                                         globals->get_scenery()->get_gnd_lights_root()->addKid( lightpoints_transform );
2010                                                 }
2011                                         } //if in1
2012                 } //if objc
2013                                 // end hack for deck lights
2014
2015                 objc++;
2016
2017                 if (in.eof()) break;
2018             }
2019         } // while
2020
2021         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
2022
2023         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
2024     }
2025
2026     return;
2027  }
2028
2029
2030 void fgUpdateDCS (void) {
2031
2032     // double eye_lat,eye_lon,eye_alt;
2033     // static double obj_head;
2034     double sl_radius,obj_latgc;
2035     // float nresultmat[4][4];
2036     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
2037     double bz[3];
2038
2039     // Instantaneous Geodetic Lat/Lon/Alt of moving object
2040     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
2041
2042     // Deck should be the first object in objects.txt in case of fdm=ada
2043
2044     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
2045                 if ((fdm->get_iaux(1))==1)
2046                 {
2047                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
2048                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
2049                         obj_alt[1] = fdm->get_daux(3);
2050                         obj_pitch[1] = fdm->get_faux(1);
2051                         obj_roll[1] = fdm->get_faux(2);
2052                 }
2053     }
2054
2055     for ( int m = 0; m < objc; m++ ) {
2056         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
2057         //int v=getchar();
2058
2059         //Geodetic to Geocentric angles for rotation
2060         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
2061
2062         //moving object gbs-posn in cartesian coords
2063         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
2064         Point3D obj_pos = sgGeodToCart( obj_posn );
2065
2066         // Translate moving object w.r.t eye
2067         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
2068         bz[0]=Objtrans.x();
2069         bz[1]=Objtrans.y();
2070         bz[2]=Objtrans.z();
2071
2072        // rotate dynamic objects for lat,lon & alt and other motion about its axes
2073
2074         sgMat4 sgTRANS;
2075         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
2076
2077         sgVec3 ship_fwd,ship_rt,ship_up;
2078         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
2079         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
2080         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
2081
2082         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
2083         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
2084         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
2085         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
2086         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
2087         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
2088
2089         sgMat4 sgTUX;
2090         sgCopyMat4( sgTUX, sgROT_hdg );
2091         sgPostMultMat4( sgTUX, sgROT_pitch );
2092         sgPostMultMat4( sgTUX, sgROT_roll );
2093         sgPostMultMat4( sgTUX, sgROT_lat );
2094         sgPostMultMat4( sgTUX, sgROT_lon );
2095         sgPostMultMat4( sgTUX, sgTRANS );
2096
2097         sgCoord shippos;
2098         sgSetCoord(&shippos, sgTUX );
2099         ship_pos[m]->setTransform( &shippos );
2100         // temporary hack for deck lights - ultimately should move to PLib (when ??)
2101         if (m == 1) {
2102                 if (lightpoints_transform) {
2103                         lightpoints_transform->setTransform( &shippos );
2104                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
2105                         if ( sun_angle > 89 ) {
2106                                 lightpoints_brightness->select(0x01);
2107                         } else {
2108                                 lightpoints_brightness->select(0x00);
2109                         }
2110                 }
2111
2112                 float elev;
2113                 sgVec3 rp,to;
2114                 float *vp;
2115                 float alt;
2116                 float ref_elev;
2117                 sgXformPnt3( rp, rway_ols, sgTUX );
2118                 vp = globals->get_current_view()->get_view_pos();
2119             to[0] = rp[0]-vp[0];
2120             to[1] = rp[1]-vp[1];
2121             to[2] = rp[2]-vp[2];
2122                 float dist = sgLengthVec3( to );
2123                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
2124
2125                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
2126
2127             ref_elev = elev - 3.75; // +ve above, -ve below
2128
2129                 unsigned int sel;
2130                 sel = 0xFF;
2131 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2132 //              if (ref_elev > 0.51) sel = 0x21;
2133 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
2134 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
2135 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
2136 //              if (ref_elev < -0.51) sel = 0x30;
2137 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2138                 dummy_tile->lightmaps_sequence->select(sel);
2139
2140                 sgVec3 up;
2141                 sgCopyVec3 (up, ship_up);
2142                 if (dist > 750)
2143                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
2144                 else
2145                         sgScaleVec3 (up, 4.0*ref_elev);
2146                 dummy_tile->ols_transform->setTransform(up);
2147                 //cout << "ref_elev  " << ref_elev << endl;
2148         }
2149     // end hack for deck lights
2150
2151     }
2152     if ( ship_sel != NULL ) {
2153         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2154     }
2155 }
2156
2157 // $$$ end - added VS Renganathan, 15 Oct 2K
2158 //           added Venky         , 12 Nov 2K