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