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/hud.hxx>
  99 #include <Cockpit/cockpit.hxx>
 100 #include <Cockpit/radiostack.hxx>
 101
 102 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 103 #include <GUI/gui.h>
 104 #include <Model/acmodel.hxx>
 105 #include <Model/loader.hxx>
 106 #include <Model/model.hxx>
 107 #include <Model/modelmgr.hxx>
 108 #include <Main/location.hxx>
 109 #include <Model/panelnode.hxx>
 110 #ifdef FG_NETWORK_OLK
 111 #include <NetworkOLK/network.h>
 112 #endif
 113
 114 #ifdef FG_MPLAYER_AS
 115 #include <MultiPlayer/multiplaytxmgr.hxx>
 116 #include <MultiPlayer/multiplayrxmgr.hxx>
 117 #endif
 118
 119 #include <Objects/matlib.hxx>
 120 #include <Scenery/scenery.hxx>
 121 #include <Scenery/tilemgr.hxx>
 122 #ifdef ENABLE_AUDIO_SUPPORT
 123 #  include <Sound/soundmgr.hxx>
 124 #  include <Sound/fg_fx.hxx>
 125 #  include <Sound/morse.hxx>
 126 #endif
 127 #include <Systems/system_mgr.hxx>
 128 #include <Instrumentation/instrument_mgr.hxx>
 129 #include <Time/FGEventMgr.hxx>
 130 #include <Time/fg_timer.hxx>
 131 #include <Time/light.hxx>
 132 #include <Time/sunpos.hxx>
 133 #include <Time/tmp.hxx>
 134
 135 // ADA
 136 #include <simgear/misc/sgstream.hxx>
 137 #include <simgear/math/point3d.hxx>
 138 #include <FDM/flight.hxx>
 139 #include <FDM/ADA.hxx>
 140 #include <Scenery/tileentry.hxx>
 141
 142 #include "fg_commands.hxx"
 143
 144 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 145 #ifdef WIN32
 146   typedef void (APIENTRY * PFNGLPOINTPARAMETERFEXTPROC)(GLenum pname,
 147                                                         GLfloat param);
 148   typedef void (APIENTRY * PFNGLPOINTPARAMETERFVEXTPROC)(GLenum pname,
 149                                                          const GLfloat *params);
 150
 151   PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 152   PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 153 #elif linux
 154   #include <GL/glx.h>
 155
 156   typedef void (* OpenGLFuncExt)(GLenum pname, GLfloat param);
 157   typedef void (* OpenGLFuncExtv)(GLenum pname, const GLfloat *params);
 158
 159   OpenGLFuncExt glPointParameterfEXT = 0;
 160   OpenGLFuncExtv glPointParameterfvEXT = 0;
 161 #endif
 162 #endif
 163
 164 float default_attenuation[3] = {1.0, 0.0, 0.0};
 165 //Required for using GL_extensions
 166 void fgLoadDCS (void);
 167 void fgUpdateDCS (void);
 168 ssgSelector *ship_sel=NULL;
 169 // upto 32 instances of a same object can be loaded.
 170 ssgTransform *ship_pos[32];
 171 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 172 int objc=0;
 173 ssgSelector *lightpoints_brightness = new ssgSelector;
 174 ssgTransform *lightpoints_transform = new ssgTransform;
 175 FGTileEntry *dummy_tile;
 176 sgVec3 rway_ols;
 177 // ADA
 178 // Clip plane settings...
 179 float scene_nearplane = 0.5f;
 180 float scene_farplane = 120000.0f;
 181
 182 static double delta_time_sec = 0;
 183
 184
 185 #ifdef FG_WEATHERCM
 186 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 187 #else
 188 #  include <Environment/environment_mgr.hxx>
 189 #endif
 190
 191 #include "version.h"
 192
 193 #include "fg_init.hxx"
 194 #include "fg_io.hxx"
 195 #include "fg_props.hxx"
 196 #include "globals.hxx"
 197 #include "splash.hxx"
 198 #include "viewmgr.hxx"
 199 #include "options.hxx"
 200 #include "logger.hxx"
 201
 202 #ifdef macintosh
 203 #  include <console.h>          // -dw- for command line dialog
 204 #endif
 205
 206
 207 FGEventMgr global_events;
 208
 209 // This is a record containing a bit of global housekeeping information
 210 FGGeneral general;
 211
 212 // Specify our current idle function state.  This is used to run all
 213 // our initializations out of the glutIdleLoop() so that we can get a
 214 // splash screen up and running right away.
 215 static int idle_state = 0;
 216 static long global_multi_loop;
 217
 218 // fog constants.  I'm a little nervous about putting actual code out
 219 // here but it seems to work (?)
 220 static const double m_log01 = -log( 0.01 );
 221 static const double sqrt_m_log01 = sqrt( m_log01 );
 222 static GLfloat fog_exp_density;
 223 static GLfloat fog_exp2_density;
 224 static GLfloat rwy_exp2_punch_through;
 225 static GLfloat taxi_exp2_punch_through;
 226 static GLfloat ground_exp2_punch_through;
 227
 228 #ifdef FG_NETWORK_OLK
 229 ssgSelector *fgd_sel = NULL;
 230 ssgTransform *fgd_pos = NULL;
 231 #endif
 232
 233 // Sky structures
 234 SGSky *thesky;
 235
 236 #ifdef FG_USE_CLOUDS_3D
 237   SkySceneLoader *sgClouds3d;
 238   bool _bcloud_orig = true;
 239 #endif
 240
 241 // hack
 242 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 243 {
 244   {  1.0f,  0.0f,  0.0f,  0.0f },
 245   {  0.0f,  0.0f, -1.0f,  0.0f },
 246   {  0.0f,  1.0f,  0.0f,  0.0f },
 247   {  0.0f,  0.0f,  0.0f,  1.0f }
 248 };
 249
 250 // The following defines flightgear options. Because glutlib will also
 251 // want to parse its own options, those options must not be included here
 252 // or they will get parsed by the main program option parser. Hence case
 253 // is significant for any option added that might be in conflict with
 254 // glutlib's parser.
 255 //
 256 // glutlib parses for:
 257 //    -display
 258 //    -direct   (invalid in Win32)
 259 //    -geometry
 260 //    -gldebug
 261 //    -iconized
 262 //    -indirect (invalid in Win32)
 263 //    -synce
 264 //
 265 // Note that glutlib depends upon strings while this program's
 266 // option parser wants only initial characters followed by numbers
 267 // or pathnames.
 268 //
 269
 270
 271 ssgSimpleState *cloud3d_imposter_state;
 272 ssgSimpleState *default_state;
 273 ssgSimpleState *hud_and_panel;
 274 ssgSimpleState *menus;
 275
 276 SGTimeStamp last_time_stamp;
 277 SGTimeStamp current_time_stamp;
 278
 279
 280 void fgBuildRenderStates( void ) {
 281     default_state = new ssgSimpleState;
 282     default_state->ref();
 283     default_state->disable( GL_TEXTURE_2D );
 284     default_state->enable( GL_CULL_FACE );
 285     default_state->enable( GL_COLOR_MATERIAL );
 286     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 287     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 288     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 289     default_state->disable( GL_BLEND );
 290     default_state->disable( GL_ALPHA_TEST );
 291     default_state->disable( GL_LIGHTING );
 292
 293     cloud3d_imposter_state = new ssgSimpleState;
 294     cloud3d_imposter_state->ref();
 295     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 296     cloud3d_imposter_state->enable( GL_CULL_FACE );
 297     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 298     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 299     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 300     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 301     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 302     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 303     cloud3d_imposter_state->enable( GL_BLEND );
 304     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 305     cloud3d_imposter_state->disable( GL_LIGHTING );
 306
 307     hud_and_panel = new ssgSimpleState;
 308     hud_and_panel->ref();
 309     hud_and_panel->disable( GL_CULL_FACE );
 310     hud_and_panel->disable( GL_TEXTURE_2D );
 311     hud_and_panel->disable( GL_LIGHTING );
 312     hud_and_panel->enable( GL_BLEND );
 313
 314     menus = new ssgSimpleState;
 315     menus->ref();
 316     menus->disable( GL_CULL_FACE );
 317     menus->disable( GL_TEXTURE_2D );
 318     menus->enable( GL_BLEND );
 319 }
 320
 321
 322 // fgInitVisuals() -- Initialize various GL/view parameters
 323 void fgInitVisuals( void ) {
 324     fgLIGHT *l;
 325
 326     l = &cur_light_params;
 327
 328 #ifndef GLUT_WRONG_VERSION
 329     // Go full screen if requested ...
 330     if ( fgGetBool("/sim/startup/fullscreen") ) {
 331         glutFullScreen();
 332     }
 333 #endif
 334
 335     // If enabled, normal vectors specified with glNormal are scaled
 336     // to unit length after transformation.  Enabling this has
 337     // performance implications.  See the docs for glNormal.
 338     // glEnable( GL_NORMALIZE );
 339
 340     glEnable( GL_LIGHTING );
 341     glEnable( GL_LIGHT0 );
 342     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 343
 344     sgVec3 sunpos;
 345     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 346     ssgGetLight( 0 ) -> setPosition( sunpos );
 347
 348     glFogi (GL_FOG_MODE, GL_EXP2);
 349     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 350          (!fgGetBool("/sim/rendering/shading"))) {
 351         // if fastest fog requested, or if flat shading force fastest
 352         glHint ( GL_FOG_HINT, GL_FASTEST );
 353     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 354         glHint ( GL_FOG_HINT, GL_NICEST );
 355     }
 356     if ( fgGetBool("/sim/rendering/wireframe") ) {
 357         // draw wire frame
 358         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 359     }
 360
 361     // This is the default anyways, but it can't hurt
 362     glFrontFace ( GL_CCW );
 363
 364     // Just testing ...
 365     // glEnable(GL_POINT_SMOOTH);
 366     // glEnable(GL_LINE_SMOOTH);
 367     // glEnable(GL_POLYGON_SMOOTH);
 368 }
 369
 370
 371 // For HiRes screen Dumps using Brian Pauls TR Library
 372 void trRenderFrame( void ) {
 373
 374     if ( fgPanelVisible() ) {
 375         GLfloat height = fgGetInt("/sim/startup/ysize");
 376         GLfloat view_h =
 377             (globals->get_current_panel()->getViewHeight() - globals->get_current_panel()->getYOffset())
 378             * (height / 768.0) + 1;
 379         glTranslatef( 0.0, view_h, 0.0 );
 380     }
 381
 382     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 383     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 384
 385     fgLIGHT *l = &cur_light_params;
 386
 387     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 388                  l->adj_fog_color[2], l->adj_fog_color[3]);
 389
 390     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 391
 392     // set the opengl state to known default values
 393     default_state->force();
 394
 395     glEnable( GL_FOG );
 396     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 397     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 398     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 399
 400     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 401     // we only update GL_AMBIENT for our lights we will never get
 402     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 403     // explicitely to black.
 404     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 405     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 406
 407     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 408
 409     // texture parameters
 410     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 411     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 412
 413     // we need a white diffuse light for the phase of the moon
 414     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 415     thesky->preDraw();
 416
 417     // draw the ssg scene
 418     // return to the desired diffuse color
 419     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 420     glEnable( GL_DEPTH_TEST );
 421     ssgSetNearFar( scene_nearplane, scene_farplane );
 422     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 423
 424     // draw the lights
 425     glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 426     ssgSetNearFar( scene_nearplane, scene_farplane );
 427     ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 428
 429     ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 430
 431     if (fgGetBool("/environment/clouds/status"))
 432         thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 433
 434     globals->get_model_mgr()->draw();
 435     globals->get_aircraft_model()->draw();
 436 }
 437
 438
 439 // Update all Visuals (redraws anything graphics related)
 440 void fgRenderFrame() {
 441
 442     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 443     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 444
 445     // Process/manage pending events
 446     global_events.update( delta_time_sec );
 447
 448     static const SGPropertyNode *longitude
 449         = fgGetNode("/position/longitude-deg");
 450     static const SGPropertyNode *latitude
 451         = fgGetNode("/position/latitude-deg");
 452     static const SGPropertyNode *altitude
 453         = fgGetNode("/position/altitude-ft");
 454     static const SGPropertyNode *groundlevel_nearplane
 455         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 456
 457     // Update the default (kludged) properties.
 458     fgUpdateProps();
 459
 460     FGViewer *current__view = globals->get_current_view();
 461
 462     fgLIGHT *l = &cur_light_params;
 463     static double last_visibility = -9999;
 464
 465     // update fog params
 466     double actual_visibility;
 467     if (fgGetBool("/environment/clouds/status"))
 468         actual_visibility = thesky->get_visibility();
 469     else
 470         actual_visibility = fgGetDouble("/environment/visibility-m");
 471     if ( actual_visibility != last_visibility ) {
 472         last_visibility = actual_visibility;
 473
 474         fog_exp_density = m_log01 / actual_visibility;
 475         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 476         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 477         if ( actual_visibility < 8000 ) {
 478             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 479             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 480         } else {
 481             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 482             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 483         }
 484     }
 485
 486     // double angle;
 487     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 488     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 489     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 490     // GLfloat mat_shininess[] = { 10.0 };
 491     GLbitfield clear_mask;
 492
 493     if ( idle_state != 1000 ) {
 494         // still initializing, draw the splash screen
 495         if ( fgGetBool("/sim/startup/splash-screen") ) {
 496             fgSplashUpdate(0.0, 1.0);
 497         }
 498         // Keep resetting sim time while the sim is initializing
 499         globals->set_sim_time_sec( 0.0 );
 500     } else {
 501         // idle_state is now 1000 meaning we've finished all our
 502         // initializations and are running the main loop, so this will
 503         // now work without seg faulting the system.
 504
 505         // calculate our current position in cartesian space
 506         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 507
 508         // update view port
 509         fgReshape( fgGetInt("/sim/startup/xsize"),
 510                    fgGetInt("/sim/startup/ysize") );
 511
 512         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 513             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 514             cloud3d_imposter_state->force();
 515             glDisable( GL_FOG );
 516             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 517             glEnable(GL_DEPTH_TEST);
 518             glEnable(GL_BLEND);
 519             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 520
 521 #ifdef FG_USE_CLOUDS_3D
 522             if ( _bcloud_orig ) {
 523                 Point3D c = globals->get_scenery()->get_center();
 524                 sgClouds3d->Set_Cloud_Orig( &c );
 525                 _bcloud_orig = false;
 526             }
 527             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 528 #endif
 529             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 530             glDisable(GL_DEPTH_TEST);
 531         }
 532
 533         clear_mask = GL_DEPTH_BUFFER_BIT;
 534         if ( fgGetBool("/sim/rendering/wireframe") ) {
 535             clear_mask |= GL_COLOR_BUFFER_BIT;
 536         }
 537
 538         if ( fgGetBool("/sim/rendering/skyblend") ) {
 539             if ( fgGetBool("/sim/rendering/textures") ) {
 540             // glClearColor(black[0], black[1], black[2], black[3]);
 541             glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 542                          l->adj_fog_color[2], l->adj_fog_color[3]);
 543             clear_mask |= GL_COLOR_BUFFER_BIT;
 544             }
 545         } else {
 546             glClearColor(l->sky_color[0], l->sky_color[1],
 547                      l->sky_color[2], l->sky_color[3]);
 548             clear_mask |= GL_COLOR_BUFFER_BIT;
 549         }
 550         glClear( clear_mask );
 551
 552         // Tell GL we are switching to model view parameters
 553
 554         // I really should create a derived ssg node or use a call
 555         // back or something so that I can draw the sky within the
 556         // ssgCullAndDraw() function, but for now I just mimic what
 557         // ssg does to set up the model view matrix
 558         glMatrixMode(GL_MODELVIEW);
 559         glLoadIdentity();
 560         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 561
 562         // set the opengl state to known default values
 563         default_state->force();
 564
 565         // update fog params if visibility has changed
 566         double visibility_meters = fgGetDouble("/environment/visibility-m");
 567         thesky->set_visibility(visibility_meters);
 568
 569         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 570                         ( global_multi_loop * fgGetInt("/sim/speed-up") )
 571                             / (double)fgGetInt("/sim/model-hz") );
 572
 573         // Set correct opengl fog density
 574         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 575
 576         // update the sky dome
 577         if ( fgGetBool("/sim/rendering/skyblend") ) {
 578             /*
 579              SG_LOG( SG_GENERAL, SG_BULK, "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] );
 584             SG_LOG( SG_GENERAL, SG_BULK, "    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] );
 589             SG_LOG( SG_GENERAL, SG_BULK,
 590                     "    sun_angle = " << cur_light_params.sun_angle
 591              << "    moon_angle = " << cur_light_params.moon_angle );
 592             */
 593
 594             // Some insane defaults.
 595             static int init = 50;
 596             static double sun_pos_angle = 9999.0;
 597             static double sun_pos_rotation = 9999.0;
 598             static double cur_lat = 9999.0;
 599             static double cur_long = 9999.0;
 600             static double cur_alt = -9999.0;
 601
 602             if ((fabs(sun_pos_rotation - cur_light_params.sun_rotation) > 5e-3)
 603                 || (fabs(sun_pos_angle - cur_light_params.sun_angle) > 5e-3)
 604                 || (init != 0))
 605             {
 606                 if (init > 0)
 607                    init--;
 608
 609                 sun_pos_angle = cur_light_params.sun_angle;
 610                 sun_pos_rotation = cur_light_params.sun_rotation;
 611
 612                 thesky->repaint( cur_light_params.sky_color,
 613                              cur_light_params.adj_fog_color,
 614                              cur_light_params.sun_angle,
 615                              cur_light_params.moon_angle,
 616                              globals->get_ephem()->getNumPlanets(),
 617                              globals->get_ephem()->getPlanets(),
 618                              globals->get_ephem()->getNumStars(),
 619                              globals->get_ephem()->getStars() );
 620             }
 621
 622             /*
 623             SG_LOG( SG_GENERAL, SG_BULK,
 624                     "thesky->reposition( view_pos = " << view_pos[0] << " "
 625              << view_pos[1] << " " << view_pos[2] );
 626             SG_LOG( SG_GENERAL, SG_BULK,
 627                     "    zero_elev = " << zero_elev[0] << " "
 628              << zero_elev[1] << " " << zero_elev[2]
 629              << " lon = " << cur_fdm_state->get_Longitude()
 630              << " lat = " << cur_fdm_state->get_Latitude() );
 631             SG_LOG( SG_GENERAL, SG_BULK,
 632                     "    sun_rot = " << cur_light_params.sun_rotation
 633              << " gst = " << SGTime::cur_time_params->getGst() );
 634             SG_LOG( SG_GENERAL, SG_BULK,
 635                  "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 636               << " sun dec = " << globals->get_ephem()->getSunDeclination()
 637               << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 638               << " moon dec = " << globals->get_ephem()->getMoonDeclination() );
 639             */
 640 #if 0
 641             if ((fabs(cur_long - current__view->getLongitude_deg()) > 5e-4)
 642                 || (fabs(cur_lat - current__view->getLatitude_deg()) > 5e-4)
 643                 || (fabs(cur_alt - current__view->getAltitudeASL_ft()) > 3)
 644                 || (init != 0))
 645             {
 646
 647                 // Hyperjump?
 648                 if ((fabs(cur_long - current__view->getLongitude_deg()) > 2)
 649                      || (fabs(cur_lat - current__view->getLatitude_deg()) > 2))
 650                    init = 50;
 651
 652                 cur_lat = current__view->getLatitude_deg();
 653                 cur_long = current__view->getLongitude_deg();
 654                 cur_alt = current__view->getAltitudeASL_ft();
 655 #endif
 656                 thesky->reposition( current__view->get_view_pos(),
 657                             current__view->get_zero_elev(),
 658                             current__view->get_world_up(),
 659                             current__view->getLongitude_deg()
 660                                * SGD_DEGREES_TO_RADIANS,
 661                             current__view->getLatitude_deg()
 662                                * SGD_DEGREES_TO_RADIANS,
 663                             current__view->getAltitudeASL_ft()
 664                                * SG_FEET_TO_METER,
 665                             cur_light_params.sun_rotation,
 666                             globals->get_time_params()->getGst(),
 667                             globals->get_ephem()->getSunRightAscension(),
 668                             globals->get_ephem()->getSunDeclination(),
 669                             50000.0,
 670                             globals->get_ephem()->getMoonRightAscension(),
 671                             globals->get_ephem()->getMoonDeclination(),
 672                             50000.0 );
 673 #if 0
 674             }
 675 #endif
 676         }
 677
 678         glEnable( GL_DEPTH_TEST );
 679         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 680             glEnable( GL_FOG );
 681             glFogi( GL_FOG_MODE, GL_EXP2 );
 682             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 683         }
 684
 685         // set sun/lighting parameters
 686         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 687
 688         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 689         // we only update GL_AMBIENT for our lights we will never get
 690         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 691         // explicitely to black.
 692         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 693
 694         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 695         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 696         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 697
 698         // texture parameters
 699         // glEnable( GL_TEXTURE_2D );
 700         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 701         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 702
 703         // glMatrixMode( GL_PROJECTION );
 704         // glLoadIdentity();
 705         ssgSetFOV( current__view->get_h_fov(),
 706                    current__view->get_v_fov() );
 707
 708         double agl =
 709             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 710             - globals->get_scenery()->get_cur_elev();
 711
 712         if ( agl > 10.0 ) {
 713             scene_nearplane = 10.0f;
 714             scene_farplane = 120000.0f;
 715         } else {
 716             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 717             scene_farplane = 120000.0f;
 718         }
 719
 720         ssgSetNearFar( scene_nearplane, scene_farplane );
 721
 722         // $$$ begin - added VS Renganthan 17 Oct 2K
 723         if(objc)
 724           fgUpdateDCS();
 725         // $$$ end - added VS Renganthan 17 Oct 2K
 726
 727 # ifdef FG_NETWORK_OLK
 728         if ( fgGetBool("/sim/networking/network-olk") ) {
 729             sgCoord fgdpos;
 730             other = head->next;             /* put listpointer to start  */
 731             while ( other != tail) {        /* display all except myself */
 732             if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 733                 other->fgd_sel->select(1);
 734                 sgSetCoord( &fgdpos, other->sgFGD_COORD );
 735                 other->fgd_pos->setTransform( &fgdpos );
 736             }
 737             other = other->next;
 738             }
 739
 740             // fgd_sel->select(1);
 741             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 742             // sgCoord fgdpos;
 743             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 744             // fgd_pos->setTransform( &fgdpos);
 745         }
 746 # endif
 747
 748 #ifdef FG_MPLAYER_AS
 749         // Update any multiplayer models
 750         globals->get_multiplayer_rx_mgr()->Update();
 751 #endif
 752
 753         if ( fgGetBool("/sim/rendering/skyblend") &&
 754              fgGetBool("/sim/rendering/draw-otw") )
 755         {
 756             // draw the sky backdrop
 757
 758             // we need a white diffuse light for the phase of the moon
 759             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 760
 761             thesky->preDraw();
 762
 763             // return to the desired diffuse color
 764             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 765         }
 766
 767         // draw the ssg scene
 768         glEnable( GL_DEPTH_TEST );
 769
 770         ssgSetNearFar( scene_nearplane, scene_farplane );
 771
 772         if ( fgGetBool("/sim/rendering/wireframe") ) {
 773             // draw wire frame
 774             glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 775         }
 776         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 777             ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 778         }
 779
 780         // This is a bit kludgy.  Every 200 frames, do an extra
 781         // traversal of the scene graph without drawing anything, but
 782         // with the field-of-view set to 360x360 degrees.  This
 783         // ensures that out-of-range random objects that are not in
 784         // the current view frustum will still be freed properly.
 785         static int counter = 0;
 786         counter++;
 787         if (counter == 200) {
 788           sgFrustum f;
 789           f.setFOV(360, 360);
 790                             // No need to put the near plane too close;
 791                             // this way, at least the aircraft can be
 792                             // culled.
 793           f.setNearFar(1000, 1000000);
 794           sgMat4 m;
 795           ssgGetModelviewMatrix(m);
 796           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 797           counter = 0;
 798         }
 799
 800         // change state for lighting here
 801
 802         // draw runway lighting
 803         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 804         ssgSetNearFar( scene_nearplane, scene_farplane );
 805
 806 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 807         // Enable states for drawing points with GL_extension
 808         glEnable(GL_POINT_SMOOTH);
 809
 810         if ( fgGetBool("/sim/rendering/distance-attenuation")
 811              && glutExtensionSupported("GL_EXT_point_parameters") )
 812         {
 813             float quadratic[3] = {1.0, 0.001, 0.0000001};
 814             // makes the points fade as they move away
 815             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 816             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 817         }
 818         glPointSize(4.0);
 819
 820         // blending function for runway lights
 821         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 822 #endif
 823
 824         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 825         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 826         glEnable(GL_TEXTURE_GEN_S);
 827         glEnable(GL_TEXTURE_GEN_T);
 828         glPolygonMode(GL_FRONT, GL_POINT);
 829
 830         // draw runway lighting
 831         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 832             ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 833         }
 834
 835         // change punch through and then draw taxi lighting
 836         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 837         // sgVec3 taxi_fog;
 838         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 839         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 840         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 841             ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 842         }
 843
 844         // clean up lighting
 845         glPolygonMode(GL_FRONT, GL_FILL);
 846         glDisable(GL_TEXTURE_GEN_S);
 847         glDisable(GL_TEXTURE_GEN_T);
 848
 849         //static int _frame_count = 0;
 850         //if (_frame_count % 30 == 0) {
 851         //  printf("SSG: %s\n", ssgShowStats());
 852         //}
 853         //else {
 854         //  ssgShowStats();
 855         //}
 856         //_frame_count++;
 857
 858
 859 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 860         if ( fgGetBool("/sim/rendering/distance-attenuation")
 861              && glutExtensionSupported("GL_EXT_point_parameters") )
 862         {
 863             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 864                                   default_attenuation);
 865         }
 866
 867         glPointSize(1.0);
 868         glDisable(GL_POINT_SMOOTH);
 869 #endif
 870
 871         // draw ground lighting
 872         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 873         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 874             ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 875         }
 876
 877         if ( fgGetBool("/sim/rendering/skyblend") ) {
 878             // draw the sky cloud layers
 879             if ( fgGetBool("/environment/clouds/status") &&
 880                  fgGetBool("/sim/rendering/draw-otw") )
 881             {
 882                 thesky->postDraw( cur_fdm_state->get_Altitude()
 883                                   * SG_FEET_TO_METER );
 884             }
 885         }
 886
 887         if ( fgGetBool("/sim/rendering/clouds3d") &&
 888              fgGetBool("/sim/rendering/draw-otw") )
 889         {
 890             glDisable( GL_FOG );
 891             glDisable( GL_LIGHTING );
 892             // cout << "drawing new clouds" << endl;
 893
 894             glEnable(GL_DEPTH_TEST);
 895             glEnable(GL_BLEND);
 896             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 897
 898             /*
 899             glEnable( GL_TEXTURE_2D );
 900             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 901             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 902             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 903             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 904             */
 905
 906 #ifdef FG_USE_CLOUDS_3D
 907             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 908 #endif
 909             glEnable( GL_FOG );
 910             glEnable( GL_LIGHTING );
 911             glEnable( GL_DEPTH_TEST );
 912             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 913         }
 914
 915         if ( fgGetBool("/sim/rendering/draw-otw") ) {
 916             globals->get_model_mgr()->draw();
 917             globals->get_aircraft_model()->draw();
 918         }
 919
 920         // display HUD && Panel
 921         glDisable( GL_FOG );
 922         glDisable( GL_DEPTH_TEST );
 923         // glDisable( GL_CULL_FACE );
 924         // glDisable( GL_TEXTURE_2D );
 925
 926         // update the controls subsystem
 927         globals->get_controls()->update(delta_time_sec);
 928
 929         hud_and_panel->apply();
 930         fgCockpitUpdate();
 931
 932         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 933         // This only works properly if called before the panel call
 934         if((fgGetBool("/sim/ATC/enabled")) || (fgGetBool("/sim/ai-traffic/enabled")))
 935             globals->get_ATC_display()->update(delta_time_sec);
 936
 937         // update the panel subsystem
 938         if ( globals->get_current_panel() != NULL ) {
 939             globals->get_current_panel()->update(delta_time_sec);
 940         }
 941         fgUpdate3DPanels();
 942
 943         // We can do translucent menus, so why not. :-)
 944         menus->apply();
 945         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 946         puDisplay();
 947         // glDisable ( GL_BLEND ) ;
 948
 949         glEnable( GL_DEPTH_TEST );
 950         glEnable( GL_FOG );
 951
 952         // Fade out the splash screen over the first three seconds.
 953         double t = globals->get_sim_time_sec();
 954         if ( t <= 1.0 ) {
 955             fgSplashUpdate(0.0, 1.0);
 956         } else if ( t <= 3.0) {
 957             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 958         }
 959     }
 960
 961     glutSwapBuffers();
 962 }
 963
 964
 965 // Update internal time dependent calculations (i.e. flight model)
 966 // FIXME: this distinction is obsolete; all subsystems now get delta
 967 // time on update.
 968 void fgUpdateTimeDepCalcs() {
 969     static bool inited = false;
 970
 971     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 972
 973     fgLIGHT *l = &cur_light_params;
 974
 975     // Initialize the FDM here if it hasn't been and if we have a
 976     // scenery elevation hit.
 977
 978     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 979     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 980
 981     if ( !cur_fdm_state->get_inited() &&
 982          globals->get_scenery()->get_cur_elev() > -9990 )
 983     {
 984         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 985         cur_fdm_state->init();
 986         if ( cur_fdm_state->get_bound() ) {
 987             cur_fdm_state->unbind();
 988         }
 989         cur_fdm_state->bind();
 990     }
 991
 992 #ifndef FG_WEATHERCM
 993     globals->get_environment_mgr()->update(delta_time_sec);
 994 #endif
 995
 996     // conceptually, the following block could be done for each fdm
 997     // instance ...
 998     if ( !cur_fdm_state->get_inited() ) {
 999         // do nothing, fdm isn't inited yet
1000     } else {
1001         // we have been inited, and  we are good to go ...
1002
1003         if ( !inited ) {
1004             inited = true;
1005         }
1006
1007         globals->get_autopilot()->update(delta_time_sec);
1008         cur_fdm_state->update(delta_time_sec);
1009     }
1010
1011     globals->get_model_mgr()->update(delta_time_sec);
1012     globals->get_aircraft_model()->update(delta_time_sec);
1013
1014     // update the view angle
1015     globals->get_viewmgr()->update(delta_time_sec);
1016
1017     l->UpdateAdjFog();
1018
1019     // Update solar system
1020     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
1021                               globals->get_time_params()->getLst(),
1022                               cur_fdm_state->get_Latitude() );
1023
1024     // Update radio stack model
1025     current_radiostack->update(delta_time_sec);
1026 }
1027
1028
1029 void fgInitTimeDepCalcs( void ) {
1030     // noop for now
1031 }
1032
1033
1034 static const double alt_adjust_ft = 3.758099;
1035 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
1036
1037
1038 // What should we do when we have nothing else to do?  Let's get ready
1039 // for the next move and update the display?
1040 static void fgMainLoop( void ) {
1041
1042     static const SGPropertyNode *longitude
1043         = fgGetNode("/position/longitude-deg");
1044     static const SGPropertyNode *latitude
1045         = fgGetNode("/position/latitude-deg");
1046     static const SGPropertyNode *altitude
1047         = fgGetNode("/position/altitude-ft");
1048     static const SGPropertyNode *clock_freeze
1049         = fgGetNode("/sim/freeze/clock", true);
1050     static const SGPropertyNode *cur_time_override
1051         = fgGetNode("/sim/time/cur-time-override", true);
1052
1053     // Update the elapsed time.
1054     static bool first_time = true;
1055     if ( first_time ) {
1056         last_time_stamp.stamp();
1057         first_time = false;
1058     }
1059     current_time_stamp.stamp();
1060     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
1061     if (clock_freeze->getBoolValue())
1062         delta_time_sec = 0;
1063     last_time_stamp = current_time_stamp;
1064     globals->inc_sim_time_sec( delta_time_sec );
1065
1066     static long remainder = 0;
1067     long elapsed;
1068 #ifdef FANCY_FRAME_COUNTER
1069     int i;
1070     double accum;
1071 #else
1072     static time_t last_time = 0;
1073     static int frames = 0;
1074 #endif // FANCY_FRAME_COUNTER
1075
1076     SGTime *t = globals->get_time_params();
1077
1078     sglog().setLogLevels( SG_ALL, (sgDebugPriority)fgGetInt("/sim/log-level") );
1079
1080     FGLocation * acmodel_location = 0;
1081     if(cur_fdm_state->getACModel() != 0) {
1082       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
1083     }
1084
1085     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
1086     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
1087
1088 #ifdef FG_NETWORK_OLK
1089     if ( fgGetBool("/sim/networking/network-olk") ) {
1090         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
1091             // printf("FGD: Netupdate\n");
1092             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
1093             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
1094         }
1095     }
1096 #endif
1097
1098 #if defined( ENABLE_PLIB_JOYSTICK )
1099     // Read joystick and update control settings
1100     // if ( fgGetString("/sim/control-mode") == "joystick" )
1101     // {
1102     //    fgJoystickRead();
1103     // }
1104 #elif defined( ENABLE_GLUT_JOYSTICK )
1105     // Glut joystick support works by feeding a joystick handler
1106     // function to glut.  This is taken care of once in the joystick
1107     // init routine and we don't have to worry about it again.
1108 #endif
1109
1110     // Fix elevation.  I'm just sticking this here for now, it should
1111     // probably move eventually
1112
1113     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
1114            scenery.get_cur_elev(),
1115            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1116            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1117
1118 // Curt is this code used?  I don't see any problems when I comment it out.
1119     if ( acmodel_location != 0 ) {
1120       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
1121         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
1122              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
1123             // now set aircraft altitude above ground
1124             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
1125                cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
1126                acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
1127                acmodel_location->get_cur_elev_m() + alt_adjust_m );
1128             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
1129                                                 + alt_adjust_m) * SG_METER_TO_FEET );
1130             SG_LOG( SG_ALL, SG_DEBUG,
1131                 "<*> resetting altitude to "
1132                 << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
1133                 << " meters" );
1134         }
1135       }
1136     }
1137 // End of code in question. (see Curt is this code used? above)
1138
1139     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
1140            scenery.get_cur_elev(),
1141            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1142            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1143
1144     // cout << "Warp = " << globals->get_warp() << endl;
1145
1146     // update "time"
1147     static bool last_clock_freeze = false;
1148
1149     if ( clock_freeze->getBoolValue() ) {
1150         // clock freeze requested
1151         if ( cur_time_override->getLongValue() == 0 ) {
1152             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
1153             globals->set_warp( 0 );
1154         }
1155     } else {
1156         // no clock freeze requested
1157         if ( last_clock_freeze == true ) {
1158             // clock just unfroze, let's set warp as the difference
1159             // between frozen time and current time so we don't get a
1160             // time jump (and corresponding sky object and lighting
1161             // jump.)
1162             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
1163             fgSetLong( "/sim/time/cur-time-override", 0 );
1164         }
1165         if ( globals->get_warp_delta() != 0 ) {
1166             globals->inc_warp( globals->get_warp_delta() );
1167         }
1168     }
1169
1170     last_clock_freeze = clock_freeze->getBoolValue();
1171
1172     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1173                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1174                cur_time_override->getLongValue(),
1175                globals->get_warp() );
1176
1177     if ( globals->get_warp_delta() != 0 ) {
1178         fgUpdateSkyAndLightingParams();
1179     }
1180
1181     // update magvar model
1182     globals->get_mag()->update( longitude->getDoubleValue()
1183                               * SGD_DEGREES_TO_RADIANS,
1184                             latitude->getDoubleValue()
1185                               * SGD_DEGREES_TO_RADIANS,
1186                             altitude->getDoubleValue() * SG_FEET_TO_METER,
1187                             globals->get_time_params()->getJD() );
1188
1189     // Get elapsed time (in usec) for this past frame
1190     elapsed = fgGetTimeInterval();
1191     SG_LOG( SG_ALL, SG_DEBUG,
1192             "Elapsed time interval is = " << elapsed
1193             << ", previous remainder is = " << remainder );
1194
1195     // Calculate frame rate average
1196 #ifdef FANCY_FRAME_COUNTER
1197     /* old fps calculation */
1198     if ( elapsed > 0 ) {
1199         double tmp;
1200         accum = 0.0;
1201         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1202             tmp = general.get_frame(i);
1203             accum += tmp;
1204             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1205             general.set_frame(i+1,tmp);
1206         }
1207         tmp = 1000000.0 / (float)elapsed;
1208         general.set_frame(0,tmp);
1209         // printf("frame[0] = %.2f\n", general.frames[0]);
1210         accum += tmp;
1211         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1212         // printf("ave = %.2f\n", general.frame_rate);
1213     }
1214 #else
1215     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1216         general.set_frame_rate( frames );
1217         fgSetInt("/sim/frame-rate", frames);
1218         SG_LOG( SG_ALL, SG_DEBUG,
1219             "--> Frame rate is = " << general.get_frame_rate() );
1220         frames = 0;
1221     }
1222     last_time = t->get_cur_time();
1223     ++frames;
1224 #endif
1225
1226     // Run ATC subsystem
1227     if (fgGetBool("/sim/ATC/enabled"))
1228         globals->get_ATC_mgr()->update(delta_time_sec);
1229
1230     // Run the AI subsystem
1231     if (fgGetBool("/sim/ai-traffic/enabled"))
1232         globals->get_AI_mgr()->update(delta_time_sec);
1233
1234     // Run flight model
1235
1236     // Calculate model iterations needed for next frame
1237     elapsed += remainder;
1238
1239     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1240                           fgGetInt("/sim/model-hz"));
1241     remainder = elapsed - ( (global_multi_loop*1000000) /
1242                         fgGetInt("/sim/model-hz") );
1243     SG_LOG( SG_ALL, SG_DEBUG,
1244             "Model iterations needed = " << global_multi_loop
1245             << ", new remainder = " << remainder );
1246
1247     // chop max interations to something reasonable if the sim was
1248     // delayed for an excesive amount of time
1249     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1250         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1251         remainder = 0;
1252     }
1253
1254     // flight model
1255     if ( global_multi_loop > 0 ) {
1256         fgUpdateTimeDepCalcs();
1257     } else {
1258         SG_LOG( SG_ALL, SG_DEBUG,
1259             "Elapsed time is zero ... we're zinging" );
1260     }
1261
1262     // Do any I/O channel work that might need to be done
1263     globals->get_io()->update( delta_time_sec );
1264
1265     // see if we need to load any deferred-load textures
1266     material_lib.load_next_deferred();
1267
1268     // Run audio scheduler
1269 #ifdef ENABLE_AUDIO_SUPPORT
1270     if ( fgGetBool("/sim/sound/audible")
1271            && globals->get_soundmgr()->is_working() ) {
1272         globals->get_soundmgr()->update( delta_time_sec );
1273     }
1274 #endif
1275
1276     globals->get_subsystem_mgr()->update(delta_time_sec);
1277
1278     //
1279     // Tile Manager updates - see if we need to load any new scenery tiles.
1280     //   this code ties together the fdm, viewer and scenery classes...
1281     //   we may want to move this to it's own class at some point
1282     //
1283     double visibility_meters = fgGetDouble("/environment/visibility-m");
1284     FGViewer *current_view = globals->get_current_view();
1285
1286     // update tile manager for FDM...
1287     // ...only if location is different than the viewer (to avoid duplicating effort)
1288     if( acmodel_location != current_view->getFGLocation() ) {
1289       if( acmodel_location != 0 ) {
1290         globals->get_tile_mgr()->prep_ssg_nodes( acmodel_location,
1291                                                  visibility_meters );
1292         globals->get_tile_mgr()->
1293             update( acmodel_location, visibility_meters,
1294                     acmodel_location->get_absolute_view_pos() );
1295         // save results of update in FGLocation for fdm...
1296         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1297           acmodel_location->
1298               set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1299         }
1300         acmodel_location->
1301             set_tile_center( globals->get_scenery()->get_next_center() );
1302       }
1303     }
1304
1305     globals->get_tile_mgr()->prep_ssg_nodes( current_view->getFGLocation(),
1306                                              visibility_meters );
1307     // update tile manager for view...
1308     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1309     // after the FDM's until all of Flight Gear code references the viewer's location
1310     // for elevation instead of the "scenery's" current elevation.
1311     FGLocation *view_location = globals->get_current_view()->getFGLocation();
1312     globals->get_tile_mgr()->update( view_location, visibility_meters,
1313                                      current_view->get_absolute_view_pos() );
1314     // save results of update in FGLocation for fdm...
1315     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1316       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1317     }
1318     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1319
1320     // If fdm location is same as viewer's then we didn't do the update for fdm location
1321     //   above so we need to save the viewer results in the fdm FGLocation as well...
1322     if( acmodel_location == current_view->getFGLocation() ) {
1323       if( acmodel_location != 0 ) {
1324         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1325           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1326         }
1327         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1328       }
1329     }
1330
1331     // END Tile Manager udpates
1332
1333     // redraw display
1334     fgRenderFrame();
1335
1336     SG_LOG( SG_ALL, SG_DEBUG, "" );
1337 }
1338
1339
1340 // This is the top level master main function that is registered as
1341 // our idle funciton
1342
1343 // The first few passes take care of initialization things (a couple
1344 // per pass) and once everything has been initialized fgMainLoop from
1345 // then on.
1346
1347 static void fgIdleFunction ( void ) {
1348     // printf("idle state == %d\n", idle_state);
1349
1350     if ( idle_state == 0 ) {
1351         // Initialize the splash screen right away
1352         if ( fgGetBool("/sim/startup/splash-screen") ) {
1353             fgSplashInit();
1354         }
1355
1356         idle_state++;
1357     } else if ( idle_state == 1 ) {
1358         // Initialize audio support
1359 #ifdef ENABLE_AUDIO_SUPPORT
1360
1361         // Start the intro music
1362         if ( fgGetBool("/sim/startup/intro-music") ) {
1363             SGPath mp3file( globals->get_fg_root() );
1364             mp3file.append( "Sounds/intro.mp3" );
1365
1366             SG_LOG( SG_GENERAL, SG_INFO,
1367                 "Starting intro music: " << mp3file.str() );
1368
1369 #if defined( __CYGWIN__ )
1370             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1371 #elif defined( WIN32 )
1372             string command = "start /m " + mp3file.str();
1373 #else
1374             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1375 #endif
1376
1377             system ( command.c_str() );
1378         }
1379 #endif
1380
1381         idle_state++;
1382     } else if ( idle_state == 2 ) {
1383         // These are a few miscellaneous things that aren't really
1384         // "subsystems" but still need to be initialized.
1385
1386 #ifdef USE_GLIDE
1387         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1388             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1389         }
1390 #endif
1391
1392         idle_state++;
1393     } else if ( idle_state == 3 ) {
1394         // This is the top level init routine which calls all the
1395         // other subsystem initialization routines.  If you are adding
1396         // a subsystem to flightgear, its initialization call should
1397         // located in this routine.
1398         if( !fgInitSubsystems()) {
1399             SG_LOG( SG_GENERAL, SG_ALERT,
1400                 "Subsystem initializations failed ..." );
1401             exit(-1);
1402         }
1403
1404         idle_state++;
1405     } else if ( idle_state == 4 ) {
1406         // setup OpenGL view parameters
1407         fgInitVisuals();
1408
1409         // Read the list of available aircrafts
1410         fgReadAircraft();
1411
1412         idle_state++;
1413     } else if ( idle_state == 5 ) {
1414
1415         idle_state++;
1416     } else if ( idle_state == 6 ) {
1417         // sleep(1);
1418         idle_state = 1000;
1419
1420         SG_LOG( SG_GENERAL, SG_INFO, "Panel visible = " << fgPanelVisible() );
1421         fgReshape( fgGetInt("/sim/startup/xsize"),
1422                fgGetInt("/sim/startup/ysize") );
1423     }
1424
1425     if ( idle_state == 1000 ) {
1426         // We've finished all our initialization steps, from now on we
1427         // run the main loop.
1428
1429         glutIdleFunc(fgMainLoop);
1430     } else {
1431         if ( fgGetBool("/sim/startup/splash-screen") ) {
1432             fgSplashUpdate(0.0, 1.0);
1433         }
1434     }
1435 }
1436
1437 // options.cxx needs to see this for toggle_panel()
1438 // Handle new window size or exposure
1439 void fgReshape( int width, int height ) {
1440     int view_h;
1441
1442     if ( (!fgGetBool("/sim/virtual-cockpit"))
1443          && fgPanelVisible() && idle_state == 1000 ) {
1444         view_h = (int)(height * (globals->get_current_panel()->getViewHeight() -
1445                              globals->get_current_panel()->getYOffset()) / 768.0);
1446     } else {
1447         view_h = height;
1448     }
1449
1450     // for all views
1451     FGViewMgr *viewmgr = globals->get_viewmgr();
1452     for ( int i = 0; i < viewmgr->size(); ++i ) {
1453       viewmgr->get_view(i)->
1454         set_aspect_ratio((float)view_h / (float)width);
1455     }
1456
1457     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1458
1459     fgSetInt("/sim/startup/xsize", width);
1460     fgSetInt("/sim/startup/ysize", height);
1461     guiInitMouse(width, height);
1462
1463     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1464                viewmgr->get_current_view()->get_v_fov() );
1465
1466     fgHUDReshape();
1467
1468 #ifdef FG_USE_CLOUDS_3D
1469     sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
1470                         viewmgr->get_current_view()->get_v_fov() );
1471 #endif
1472
1473 }
1474
1475 // Initialize GLUT and define a main window
1476 static bool fgGlutInit( int *argc, char **argv ) {
1477
1478 #if !defined( macintosh )
1479     // GLUT will extract all glut specific options so later on we only
1480     // need wory about our own.
1481     glutInit(argc, argv);
1482 #endif
1483
1484     // Define Display Parameters. Clouds3d works best with --bpp32 option
1485     if ( fgGetBool("/sim/rendering/clouds3d") ) {
1486         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_ALPHA );
1487     } else {
1488         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1489     }
1490
1491     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1492             fgGetInt("/sim/startup/xsize") << "x"
1493             << fgGetInt("/sim/startup/ysize") );
1494
1495     // Define initial window size
1496     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1497                     fgGetInt("/sim/startup/ysize") );
1498
1499     // Initialize windows
1500     if ( !fgGetBool("/sim/startup/game-mode")) {
1501         // Open the regular window
1502         glutCreateWindow("FlightGear");
1503 #ifndef GLUT_WRONG_VERSION
1504     } else {
1505         // Open the cool new 'game mode' window
1506         char game_mode_str[256];
1507 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1508 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1509 #ifndef ENUM_CURRENT_SETTINGS
1510 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1511 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1512 #endif
1513
1514         DEVMODE dm;
1515         dm.dmSize = sizeof(DEVMODE);
1516         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1517         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1518         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1519         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1520                             fgGetInt("/sim/startup/ysize") );
1521         sprintf( game_mode_str, "%dx%d:%d@%d",
1522                      dm.dmPelsWidth,
1523                      dm.dmPelsHeight,
1524                      dm.dmBitsPerPel,
1525                      dm.dmDisplayFrequency );
1526 #else
1527         // Open the cool new 'game mode' window
1528         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1529              fgGetInt("/sim/startup/xsize"),
1530              fgGetInt("/sim/startup/ysize"),
1531              fgGetInt("/sim/rendering/bits-per-pixel"));
1532
1533 #endif // HAVE_WINDOWS_H
1534         SG_LOG( SG_GENERAL, SG_INFO,
1535             "game mode params = " << game_mode_str );
1536         glutGameModeString( game_mode_str );
1537         glutEnterGameMode();
1538 #endif // GLUT_WRONG_VERSION
1539     }
1540
1541     // This seems to be the absolute earliest in the init sequence
1542     // that these calls will return valid info.  Too bad it's after
1543     // we've already created and sized out window. :-(
1544     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1545     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1546     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1547     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1548
1549     GLint tmp;
1550     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1551     general.set_glMaxTexSize( tmp );
1552     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1553
1554     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1555     general.set_glDepthBits( tmp );
1556     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1557
1558     return true;
1559 }
1560
1561
1562 // Initialize GLUT event handlers
1563 static bool fgGlutInitEvents( void ) {
1564     // call fgReshape() on window resizes
1565     glutReshapeFunc( fgReshape );
1566
1567     // keyboard and mouse callbacks are set in FGInput::init
1568
1569     // call fgMainLoop() whenever there is
1570     // nothing else to do
1571     glutIdleFunc( fgIdleFunction );
1572
1573     // draw the scene
1574     glutDisplayFunc( fgRenderFrame );
1575
1576     return true;
1577 }
1578
1579 // Main top level initialization
1580 static bool fgMainInit( int argc, char **argv ) {
1581
1582 #if defined( macintosh )
1583     freopen ("stdout.txt", "w", stdout );
1584     freopen ("stderr.txt", "w", stderr );
1585     argc = ccommand( &argv );
1586 #endif
1587
1588     // set default log levels
1589     sglog().setLogLevels( SG_ALL, SG_INFO );
1590
1591     string version;
1592 #ifdef FLIGHTGEAR_VERSION
1593     version = FLIGHTGEAR_VERSION;
1594 #else
1595     version = "unknown version";
1596 #endif
1597     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1598             << version );
1599     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1600
1601     // Allocate global data structures.  This needs to happen before
1602     // we parse command line options
1603
1604     globals = new FGGlobals;
1605
1606 #ifndef FG_WEATHERCM
1607     globals->set_environment_mgr(new FGEnvironmentMgr);
1608 #endif
1609
1610     // seed the random number generater
1611     sg_srandom_time();
1612
1613     SGRoute *route = new SGRoute;
1614     globals->set_route( route );
1615
1616     FGControls *controls = new FGControls;
1617     globals->set_controls( controls );
1618
1619     string_list *col = new string_list;
1620     globals->set_channel_options_list( col );
1621
1622     // Scan the config file(s) and command line options to see if
1623     // fg_root was specified (ignore all other options for now)
1624     fgInitFGRoot(argc, argv);
1625
1626     // Check for the correct base package version
1627     static char required_version[] = "0.9.1";
1628     string base_version = fgBasePackageVersion();
1629     if ( !(base_version == required_version) ) {
1630         // tell the operator how to use this application
1631
1632         cerr << endl << "Base package check failed ... " \
1633              << "Found version " << base_version << " at: " \
1634              << globals->get_fg_root() << endl;
1635         cerr << "Please upgrade to version: " << required_version << endl;
1636         exit(-1);
1637     }
1638
1639     // Initialize the Aircraft directory to "" (UIUC)
1640     aircraft_dir = "";
1641
1642     // Load the configuration parameters.  (Command line options
1643     // overrides config file options.  Config file options override
1644     // defaults.)
1645     if ( !fgInitConfig(argc, argv) ) {
1646         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1647         exit(-1);
1648     }
1649
1650     // Initialize the Window/Graphics environment.
1651     if( !fgGlutInit(&argc, argv) ) {
1652         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1653         exit(-1);
1654     }
1655
1656     // Initialize the various GLUT Event Handlers.
1657     if( !fgGlutInitEvents() ) {
1658  SG_LOG( SG_GENERAL, SG_ALERT,
1659                 "GLUT event handler initialization failed ..." );
1660         exit(-1);
1661     }
1662
1663     // Initialize plib net interface
1664     netInit( &argc, argv );
1665
1666     // Initialize ssg (from plib).  Needs to come before we do any
1667     // other ssg stuff, but after opengl/glut has been initialized.
1668     ssgInit();
1669
1670     // Initialize the user interface (we need to do this before
1671     // passing off control to glut and before fgInitGeneral to get our
1672     // fonts !!!
1673     guiInit();
1674
1675     // Read the list of available aircrafts
1676     fgReadAircraft();
1677
1678 #ifdef GL_EXT_texture_lod_bias
1679     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1680 #endif
1681
1682 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
1683             // get the address of our OpenGL extensions
1684     if ( fgGetBool("/sim/rendering/distance-attenuation") )
1685     {
1686 #ifdef WIN32
1687         glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
1688             wglGetProcAddress("glPointParameterfEXT");
1689         glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
1690             wglGetProcAddress("glPointParameterfvEXT");
1691 #elif linux
1692         glPointParameterfEXT = (OpenGLFuncExt)
1693             glXGetProcAddressARB((GLubyte *)"glPointParameterfEXT");
1694         glPointParameterfvEXT = (OpenGLFuncExtv)
1695             glXGetProcAddressARB((GLubyte *)"glPointParameterfvEXT");
1696 #endif
1697    }
1698 #endif
1699
1700     // based on the requested presets, calculate the true starting
1701     // lon, lat
1702     fgInitNav();
1703     fgInitPosition();
1704
1705     SGTime *t = fgInitTime();
1706     globals->set_time_params( t );
1707
1708     // Do some quick general initializations
1709     if( !fgInitGeneral()) {
1710         SG_LOG( SG_GENERAL, SG_ALERT,
1711             "General initializations failed ..." );
1712         exit(-1);
1713     }
1714
1715     SGPath modelpath( globals->get_fg_root() );
1716     ssgModelPath( (char *)modelpath.c_str() );
1717
1718     // Initialize the global scenery manager
1719     globals->set_scenery( new FGScenery );
1720     globals->get_scenery()->init();
1721     globals->get_scenery()->bind();
1722
1723     // Initialize the global tile manager
1724     globals->set_tile_mgr( new FGTileMgr );
1725
1726     ////////////////////////////////////////////////////////////////////
1727     // Initialize the property-based built-in commands
1728     ////////////////////////////////////////////////////////////////////
1729     fgInitCommands();
1730
1731     ////////////////////////////////////////////////////////////////////
1732     // Initialize the general model subsystem.
1733     ////////////////////////////////////////////////////////////////////
1734
1735     globals->set_model_loader(new FGModelLoader);
1736     globals->set_texture_loader(new FGTextureLoader);
1737     globals->set_model_mgr(new FGModelMgr);
1738     globals->get_model_mgr()->init();
1739     globals->get_model_mgr()->bind();
1740
1741     ////////////////////////////////////////////////////////////////////
1742     // Initialize the 3D aircraft model subsystem.
1743     ////////////////////////////////////////////////////////////////////
1744
1745     globals->set_aircraft_model(new FGAircraftModel);
1746     globals->get_aircraft_model()->init();
1747     globals->get_aircraft_model()->bind();
1748
1749     ////////////////////////////////////////////////////////////////////
1750     // Initialize the view manager subsystem.
1751     ////////////////////////////////////////////////////////////////////
1752
1753     FGViewMgr *viewmgr = new FGViewMgr;
1754     globals->set_viewmgr( viewmgr );
1755     viewmgr->init();
1756     viewmgr->bind();
1757
1758
1759     // Initialize the sky
1760     SGPath ephem_data_path( globals->get_fg_root() );
1761     ephem_data_path.append( "Astro" );
1762     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1763     ephem->update( globals->get_time_params()->getMjd(),
1764                globals->get_time_params()->getLst(),
1765                0.0 );
1766     globals->set_ephem( ephem );
1767
1768                             // TODO: move to environment mgr
1769     thesky = new SGSky;
1770     SGPath texture_path(globals->get_fg_root());
1771     texture_path.append("Textures");
1772     texture_path.append("Sky");
1773     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1774         SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1775         thesky->add_cloud_layer(layer);
1776     }
1777
1778
1779     SGPath sky_tex_path( globals->get_fg_root() );
1780     sky_tex_path.append( "Textures" );
1781     sky_tex_path.append( "Sky" );
1782     thesky->texture_path( sky_tex_path.str() );
1783
1784     thesky->build( 550.0, 550.0,
1785                globals->get_ephem()->getNumPlanets(),
1786                globals->get_ephem()->getPlanets(), 60000.0,
1787                globals->get_ephem()->getNumStars(),
1788                globals->get_ephem()->getStars(), 60000.0 );
1789
1790     // Initialize MagVar model
1791     SGMagVar *magvar = new SGMagVar();
1792     globals->set_mag( magvar );
1793
1794     // airport = new ssgBranch;
1795     // airport->setName( "Airport Lighting" );
1796     // lighting->addKid( airport );
1797
1798     // ADA
1799     fgLoadDCS();
1800     // ADA
1801
1802 #ifdef FG_NETWORK_OLK
1803     // Do the network intialization
1804     if ( fgGetBool("/sim/networking/network-olk") ) {
1805         printf("Multipilot mode %s\n",
1806                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1807     }
1808 #endif
1809
1810     // build our custom render states
1811     fgBuildRenderStates();
1812
1813     // pass control off to the master GLUT event handler
1814     glutMainLoop();
1815
1816     // we never actually get here ... but to avoid compiler warnings,
1817     // etc.
1818     return false;
1819 }
1820
1821
1822 // $$$ end - added VS Renganathan, 15 Oct 2K
1823 //         - added Venky         , 12 Nov 2K
1824
1825 #if defined(__linux__) && defined(__i386__)
1826
1827 static void handleFPE (int);
1828
1829 static void
1830 initFPE ()
1831 {
1832     fpu_control_t fpe_flags = 0;
1833     _FPU_GETCW(fpe_flags);
1834 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1835 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1836 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1837 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1838 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1839 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1840     _FPU_SETCW(fpe_flags);
1841     signal(SIGFPE, handleFPE);
1842 }
1843
1844 static void
1845 handleFPE (int num)
1846 {
1847   initFPE();
1848   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1849 }
1850 #endif
1851
1852 #ifdef __APPLE__
1853
1854 typedef struct
1855 {
1856   int  lo;
1857   int  hi;
1858 } PSN;
1859
1860 extern "C" {
1861   short CPSGetCurrentProcess(PSN *psn);
1862   short CPSSetProcessName (PSN *psn, char *processname);
1863   short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
1864   short CPSSetFrontProcess(PSN *psn);
1865 };
1866
1867 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
1868
1869 #endif
1870
1871 // Main entry point; catch any exceptions that have made it this far.
1872 int main ( int argc, char **argv ) {
1873
1874     // Enable floating-point exceptions for Linux/x86
1875 #if defined(__linux__) && defined(__i386__)
1876     initFPE();
1877 #endif
1878
1879     // Enable floating-point exceptions for Windows
1880 #if defined( _MSC_VER ) && defined( DEBUG )
1881     // Christian, we should document what this does
1882     _control87( _EM_INEXACT, _MCW_EM );
1883 #endif
1884
1885 #if defined( HAVE_BC5PLUS )
1886     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1887 #endif
1888
1889     // Keyboard focus hack
1890 #ifdef __APPLE__
1891     {
1892       PSN psn;
1893
1894       glutInit (&argc, argv);
1895
1896       CPSGetCurrentProcess(&psn);
1897       CPSSetProcessName(&psn, "FlightGear");
1898       CPSEnableFG(&psn);
1899       CPSSetFrontProcess(&psn);
1900     }
1901 #endif
1902
1903     // FIXME: add other, more specific
1904     // exceptions.
1905     try {
1906         fgMainInit(argc, argv);
1907     } catch (sg_throwable &t) {
1908                             // We must use cerr rather than
1909                             // logging, since logging may be
1910                             // disabled.
1911         cerr << "Fatal error: " << t.getFormattedMessage()
1912              << "\n (received from " << t.getOrigin() << ')' << endl;
1913         exit(1);
1914     }
1915
1916     return 0;
1917 }
1918
1919
1920 void fgLoadDCS(void) {
1921
1922     ssgEntity *ship_obj = NULL;
1923
1924     char obj_filename[25];
1925
1926     for ( int k = 0; k < 32; k++ ) {
1927         ship_pos[k]=NULL;
1928     }
1929
1930     SGPath tile_path( globals->get_fg_root());
1931     tile_path.append( "Scenery" );
1932     tile_path.append( "Objects.txt" );
1933     sg_gzifstream in( tile_path.str() );
1934     if ( ! in.is_open() ) {
1935         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1936     } else {
1937
1938         SGPath modelpath( globals->get_fg_root() );
1939         modelpath.append( "Models" );
1940         modelpath.append( "Geometry" );
1941
1942         SGPath texturepath( globals->get_fg_root() );
1943         texturepath.append( "Models" );
1944         texturepath.append( "Textures" );
1945
1946         ssgModelPath( (char *)modelpath.c_str() );
1947         ssgTexturePath( (char *)texturepath.c_str() );
1948
1949         ship_sel = new ssgSelector;
1950
1951         char c;
1952         while ( ! in.eof() ) {
1953             in >> ::skipws;
1954             if ( in.get( c ) && c == '#' ) {
1955                 in >> skipeol;
1956             } else {
1957                 in.putback(c);
1958                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1959                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1960                    int chj=getchar();*/
1961
1962                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1963                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1964
1965                 ship_pos[objc] = new ssgTransform;
1966
1967                 // type "repeat" in objects.txt to load one more
1968                 // instance of the last object.
1969
1970                 if ( strcmp(obj_filename,"repeat") != 0) {
1971                     ship_obj =
1972                         globals->get_model_loader()->load_model( obj_filename );
1973                 }
1974
1975                 if ( ship_obj != NULL ) {
1976                                 ship_obj->setName(obj_filename);
1977                             if (objc == 0)
1978                                         ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1979                                 else
1980                                         ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1981                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1982                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1983                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1984                             << obj_filename );
1985                 } else {
1986                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1987                             << obj_filename );
1988                 }
1989
1990                             // temporary hack for deck lights - ultimately should move to PLib (when??)
1991                             //const char *extn = file_extension ( obj_filename ) ;
1992                             if ( objc == 1 ){
1993                                 ssgVertexArray *lights = new ssgVertexArray( 100 );
1994                                 ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1995                                 ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1996                                 ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1997                                 int ltype[500], light_type;
1998                                 static int ltcount = 0;
1999                                 string token;
2000                                 sgVec3 rway_dir,rway_normal,lightpt;
2001                                 Point3D node;
2002                                 modelpath.append(obj_filename);
2003                                 sg_gzifstream in1( modelpath.str() );
2004                                 if ( ! in1.is_open() ) {
2005                                         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
2006                                 } else {
2007                                         while ( ! in1.eof() ) {
2008                                                         in1 >> ::skipws;
2009                                                 if ( in1.get( c ) && c == '#' ) {
2010                                                         in1 >> skipeol;
2011                                                 } else {
2012                                                         in1.putback(c);
2013                                                         in1 >> token;
2014                                                         //cout << token << endl;
2015                                                         if ( token == "runway" ) {
2016                                                                 in1 >> node;
2017                                                                 sgSetVec3 (rway_dir, node[0], node[1], node[2] );
2018                                                         } else if ( token == "edgelight" ) {
2019                                                                 in1 >> node;
2020                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2021                                                                 light_type = 1;
2022                                                         } else if ( token == "taxi" ) {
2023                                                                 in1 >> node;
2024                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2025                                                                 light_type = 2;
2026                                                         } else if ( token == "vasi" ) {
2027                                                                 in1 >> node;
2028                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2029                                                                 light_type = 3;
2030                                                         } else if ( token == "threshold" ) {
2031                                                                 in1 >> node;
2032                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2033                                                                 light_type = 4;
2034                                                         } else if ( token == "rabbit" ) {
2035                                                                 in1 >> node;
2036                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2037                                                                 light_type = 5;
2038                                                         } else if ( token == "ols" ) {
2039                                                                 in1 >> node;
2040                                                                 sgSetVec3 (rway_ols, node[0], node[1], node[2] );
2041                                                                 light_type = 6;
2042                                                         } else if ( token == "red" ) {
2043                                                                 in1 >> node;
2044                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2045                                                                 light_type = 7;
2046                                                         } else if ( token == "green" ) {
2047                                                                 in1 >> node;
2048                                                                 sgSetVec3 (rway_normal, node[0], node[1], node[2] );
2049                                                                 light_type = 8;
2050                                                         } else if ( token == "lp" ) {
2051                                                                 in1 >> node;
2052                                                                 sgSetVec3 (lightpt, node[0], node[1], node[2] );
2053                                                                 lightpoints->add( lightpt );
2054                                                                 lightnormals->add( rway_normal );
2055                                                                 lightdir->add( rway_dir );
2056                                                                 ltype[ltcount]= light_type;
2057                                                                 ltcount++;
2058                                                         }
2059                                                         if (in1.eof()) break;
2060                                                 }
2061                                         }  //while
2062
2063                                         if ( lightpoints->getNum() ) {
2064                                                 ssgBranch *lightpoints_branch;
2065                                                 long int dummy = -999;
2066                                                 dummy_tile = new FGTileEntry((SGBucket)dummy);
2067                                                 dummy_tile->lightmaps_sequence = new ssgSelector;
2068                                                 dummy_tile->ols_transform = new ssgTransform;
2069
2070                                                 // call function to generate the runway lights
2071                                                 lightpoints_branch =
2072                                                 dummy_tile->gen_runway_lights( lightpoints, lightnormals,
2073                                                                                                                         lightdir, ltype);
2074                                                 lightpoints_brightness->addKid(lightpoints_branch);
2075                                                 lightpoints_transform->addKid(lightpoints_brightness);
2076                                             //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
2077                                                 lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
2078                                                 lightpoints_transform->ref();
2079                                                 globals->get_scenery()->get_gnd_lights_root()->addKid( lightpoints_transform );
2080                                         }
2081                                 } //if in1
2082                 } //if objc
2083                             // end hack for deck lights
2084
2085                 objc++;
2086
2087                 if (in.eof()) break;
2088             }
2089         } // while
2090
2091         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
2092
2093         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
2094     }
2095
2096     return;
2097  }
2098
2099
2100 void fgUpdateDCS (void) {
2101
2102     // double eye_lat,eye_lon,eye_alt;
2103     // static double obj_head;
2104     double sl_radius,obj_latgc;
2105     // float nresultmat[4][4];
2106     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
2107     double bz[3];
2108
2109     // Instantaneous Geodetic Lat/Lon/Alt of moving object
2110     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
2111
2112     // Deck should be the first object in objects.txt in case of fdm=ada
2113
2114     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
2115             if ((fdm->get_iaux(1))==1)
2116             {
2117                     obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
2118                     obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
2119                     obj_alt[1] = fdm->get_daux(3);
2120                     obj_pitch[1] = fdm->get_faux(1);
2121                     obj_roll[1] = fdm->get_faux(2);
2122             }
2123     }
2124
2125     for ( int m = 0; m < objc; m++ ) {
2126         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
2127         //int v=getchar();
2128
2129         //Geodetic to Geocentric angles for rotation
2130         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
2131
2132         //moving object gbs-posn in cartesian coords
2133         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
2134         Point3D obj_pos = sgGeodToCart( obj_posn );
2135
2136         // Translate moving object w.r.t eye
2137         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
2138         bz[0]=Objtrans.x();
2139         bz[1]=Objtrans.y();
2140         bz[2]=Objtrans.z();
2141
2142        // rotate dynamic objects for lat,lon & alt and other motion about its axes
2143
2144         sgMat4 sgTRANS;
2145         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
2146
2147         sgVec3 ship_fwd,ship_rt,ship_up;
2148         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
2149         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
2150         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
2151
2152         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
2153         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
2154         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
2155         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
2156         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
2157         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
2158
2159         sgMat4 sgTUX;
2160         sgCopyMat4( sgTUX, sgROT_hdg );
2161         sgPostMultMat4( sgTUX, sgROT_pitch );
2162         sgPostMultMat4( sgTUX, sgROT_roll );
2163         sgPostMultMat4( sgTUX, sgROT_lat );
2164         sgPostMultMat4( sgTUX, sgROT_lon );
2165         sgPostMultMat4( sgTUX, sgTRANS );
2166
2167         sgCoord shippos;
2168         sgSetCoord(&shippos, sgTUX );
2169         ship_pos[m]->setTransform( &shippos );
2170         // temporary hack for deck lights - ultimately should move to PLib (when ??)
2171         if (m == 1) {
2172             if (lightpoints_transform) {
2173                     lightpoints_transform->setTransform( &shippos );
2174                     float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
2175                     if ( sun_angle > 89 ) {
2176                             lightpoints_brightness->select(0x01);
2177                     } else {
2178                             lightpoints_brightness->select(0x00);
2179                     }
2180             }
2181
2182             float elev;
2183             sgVec3 rp,to;
2184             float *vp;
2185             float alt;
2186             float ref_elev;
2187             sgXformPnt3( rp, rway_ols, sgTUX );
2188             vp = globals->get_current_view()->get_view_pos();
2189             to[0] = rp[0]-vp[0];
2190             to[1] = rp[1]-vp[1];
2191             to[2] = rp[2]-vp[2];
2192             float dist = sgLengthVec3( to );
2193             alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
2194
2195             elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
2196
2197             ref_elev = elev - 3.75; // +ve above, -ve below
2198
2199             unsigned int sel;
2200             sel = 0xFF;
2201 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2202 //              if (ref_elev > 0.51) sel = 0x21;
2203 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
2204 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
2205 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
2206 //              if (ref_elev < -0.51) sel = 0x30;
2207 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2208             dummy_tile->lightmaps_sequence->select(sel);
2209
2210             sgVec3 up;
2211             sgCopyVec3 (up, ship_up);
2212             if (dist > 750)
2213                     sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
2214             else
2215                     sgScaleVec3 (up, 4.0*ref_elev);
2216             dummy_tile->ols_transform->setTransform(up);
2217             //cout << "ref_elev  " << ref_elev << endl;
2218         }
2219     // end hack for deck lights
2220
2221     }
2222     if ( ship_sel != NULL ) {
2223         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2224     }
2225 }
2226
2227 // $$$ end - added VS Renganathan, 15 Oct 2K
2228 //           added Venky         , 12 Nov 2K