src/Main/main.cxx

   1 // main.cxx -- top level sim routines
   2 //
   3 // Written by Curtis Olson, started May 1997.
   4 //
   5 // Copyright (C) 1997 - 2002  Curtis L. Olson  - curt@flightgear.org
   6 //
   7 // This program is free software; you can redistribute it and/or
   8 // modify it under the terms of the GNU General Public License as
   9 // published by the Free Software Foundation; either version 2 of the
  10 // License, or (at your option) any later version.
  11 //
  12 // This program is distributed in the hope that it will be useful, but
  13 // WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 // General Public License for more details.
  16 //
  17 // You should have received a copy of the GNU General Public License
  18 // along with this program; if not, write to the Free Software
  19 // Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 //
  21 // $Id$
  22
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include <config.h>
  26 #endif
  27
  28 #if defined(__linux__) && defined(__i386__)
  29 #  include <fpu_control.h>
  30 #  include <signal.h>
  31 #endif
  32
  33 #include <simgear/compiler.h>
  34
  35 #include STL_IOSTREAM
  36 SG_USING_STD(cerr);
  37 SG_USING_STD(endl);
  38
  39 #include <simgear/misc/exception.hxx>
  40 #include <simgear/ephemeris/ephemeris.hxx>
  41 #include <simgear/route/route.hxx>
  42
  43 #ifdef SG_MATH_EXCEPTION_CLASH
  44 #  include <math.h>
  45 #endif
  46
  47 #ifdef HAVE_WINDOWS_H
  48 #  include <windows.h>
  49 #  include <float.h>
  50 #endif
  51
  52 #include GLUT_H
  53
  54 #include <stdio.h>
  55 #include <string.h>             // for strcmp()
  56 #include <string>
  57
  58 #ifdef HAVE_STDLIB_H
  59 #   include <stdlib.h>
  60 #endif
  61
  62 #ifdef HAVE_SYS_STAT_H
  63 #  include <sys/stat.h>         // for stat()
  64 #endif
  65
  66 #ifdef HAVE_UNISTD_H
  67 #  include <unistd.h>           // for stat()
  68 #endif
  69
  70 #include <plib/netChat.h>
  71 #include <plib/pu.h>
  72 #include <plib/sg.h>
  73 #include <plib/ssg.h>
  74
  75 #include <simgear/constants.h>  // for VERSION
  76 #include <simgear/debug/logstream.hxx>
  77 #include <simgear/math/polar3d.hxx>
  78 #include <simgear/math/sg_random.h>
  79 #include <simgear/misc/sg_path.hxx>
  80 #ifdef FG_USE_CLOUDS_3D
  81 #  include <simgear/sky/clouds3d/SkySceneLoader.hpp>
  82 #  include <simgear/sky/clouds3d/SkyUtil.hpp>
  83 #endif
  84 #include <simgear/sky/sky.hxx>
  85 #include <simgear/timing/sg_time.hxx>
  86
  87 #include <Include/general.hxx>
  88
  89 #include <Aircraft/aircraft.hxx>
  90
  91 #include <ATC/ATCmgr.hxx>
  92 #include <ATC/ATCdisplay.hxx>
  93 #include <ATC/AIMgr.hxx>
  94
  95
  96 #include <Autopilot/newauto.hxx>
  97
  98 #include <Cockpit/cockpit.hxx>
  99 #include <Cockpit/radiostack.hxx>
 100
 101 #include <FDM/UIUCModel/uiuc_aircraftdir.h>
 102 #include <GUI/gui.h>
 103 #include <Model/acmodel.hxx>
 104 #include <Model/loader.hxx>
 105 #include <Model/model.hxx>
 106 #include <Model/modelmgr.hxx>
 107 #include <Main/location.hxx>
 108 #include <Model/panelnode.hxx>
 109 #ifdef FG_NETWORK_OLK
 110 #include <NetworkOLK/network.h>
 111 #endif
 112 #include <Objects/matlib.hxx>
 113 #include <Scenery/scenery.hxx>
 114 #include <Scenery/tilemgr.hxx>
 115 #ifdef ENABLE_AUDIO_SUPPORT
 116 #  include <Sound/soundmgr.hxx>
 117 #  include <Sound/fg_fx.hxx>
 118 #  include <Sound/morse.hxx>
 119 #endif
 120 #include <Systems/system_mgr.hxx>
 121 #include <Instrumentation/instrument_mgr.hxx>
 122 #include <Time/FGEventMgr.hxx>
 123 #include <Time/fg_timer.hxx>
 124 #include <Time/light.hxx>
 125 #include <Time/sunpos.hxx>
 126 #include <Time/tmp.hxx>
 127
 128 // ADA
 129 #include <simgear/misc/sgstream.hxx>
 130 #include <simgear/math/point3d.hxx>
 131 #include <FDM/flight.hxx>
 132 #include <FDM/ADA.hxx>
 133 #include <Scenery/tileentry.hxx>
 134
 135 #include "fg_commands.hxx"
 136
 137 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 138 #ifdef WIN32
 139   typedef void (APIENTRY * PFNGLPOINTPARAMETERFEXTPROC)(GLenum pname,
 140                                                         GLfloat param);
 141   typedef void (APIENTRY * PFNGLPOINTPARAMETERFVEXTPROC)(GLenum pname,
 142                                                          const GLfloat *params);
 143
 144   PFNGLPOINTPARAMETERFEXTPROC glPointParameterfEXT = 0;
 145   PFNGLPOINTPARAMETERFVEXTPROC glPointParameterfvEXT = 0;
 146 #elif linux
 147   #include <GL/glx.h>
 148
 149   typedef void (* OpenGLFuncExt)(GLenum pname, GLfloat param);
 150   typedef void (* OpenGLFuncExtv)(GLenum pname, const GLfloat *params);
 151
 152   OpenGLFuncExt glPointParameterfEXT = 0;
 153   OpenGLFuncExtv glPointParameterfvEXT = 0;
 154 #endif
 155 #endif
 156
 157 float default_attenuation[3] = {1.0, 0.0, 0.0};
 158 //Required for using GL_extensions
 159 void fgLoadDCS (void);
 160 void fgUpdateDCS (void);
 161 ssgSelector *ship_sel=NULL;
 162 // upto 32 instances of a same object can be loaded.
 163 ssgTransform *ship_pos[32];
 164 double obj_lat[32],obj_lon[32],obj_alt[32],obj_pitch[32],obj_roll[32];
 165 int objc=0;
 166 ssgSelector *lightpoints_brightness = new ssgSelector;
 167 ssgTransform *lightpoints_transform = new ssgTransform;
 168 FGTileEntry *dummy_tile;
 169 sgVec3 rway_ols;
 170 // ADA
 171 // Clip plane settings...
 172 float scene_nearplane = 0.5f;
 173 float scene_farplane = 120000.0f;
 174
 175 static double delta_time_sec = 0;
 176
 177
 178 #ifdef FG_WEATHERCM
 179 #  include <WeatherCM/FGLocalWeatherDatabase.h>
 180 #else
 181 #  include <Environment/environment_mgr.hxx>
 182 #endif
 183
 184 #include "version.h"
 185
 186 #include "fg_init.hxx"
 187 #include "fg_io.hxx"
 188 #include "fg_props.hxx"
 189 #include "globals.hxx"
 190 #include "splash.hxx"
 191 #include "viewmgr.hxx"
 192 #include "options.hxx"
 193 #include "logger.hxx"
 194
 195 #ifdef macintosh
 196 #  include <console.h>          // -dw- for command line dialog
 197 #endif
 198
 199
 200 FGEventMgr global_events;
 201
 202 // This is a record containing a bit of global housekeeping information
 203 FGGeneral general;
 204
 205 // Specify our current idle function state.  This is used to run all
 206 // our initializations out of the glutIdleLoop() so that we can get a
 207 // splash screen up and running right away.
 208 static int idle_state = 0;
 209 static long global_multi_loop;
 210
 211 // forward declaration
 212 void fgReshape( int width, int height );
 213
 214 // fog constants.  I'm a little nervous about putting actual code out
 215 // here but it seems to work (?)
 216 static const double m_log01 = -log( 0.01 );
 217 static const double sqrt_m_log01 = sqrt( m_log01 );
 218 static GLfloat fog_exp_density;
 219 static GLfloat fog_exp2_density;
 220 static GLfloat rwy_exp2_punch_through;
 221 static GLfloat taxi_exp2_punch_through;
 222 static GLfloat ground_exp2_punch_through;
 223
 224 #ifdef FG_NETWORK_OLK
 225 ssgSelector *fgd_sel = NULL;
 226 ssgTransform *fgd_pos = NULL;
 227 #endif
 228
 229 // Sky structures
 230 SGSky *thesky;
 231
 232 #ifdef FG_USE_CLOUDS_3D
 233   SkySceneLoader *sgClouds3d;
 234   bool _bcloud_orig = true;
 235 #endif
 236
 237 // hack
 238 sgMat4 copy_of_ssgOpenGLAxisSwapMatrix =
 239 {
 240   {  1.0f,  0.0f,  0.0f,  0.0f },
 241   {  0.0f,  0.0f, -1.0f,  0.0f },
 242   {  0.0f,  1.0f,  0.0f,  0.0f },
 243   {  0.0f,  0.0f,  0.0f,  1.0f }
 244 };
 245
 246 // The following defines flightgear options. Because glutlib will also
 247 // want to parse its own options, those options must not be included here
 248 // or they will get parsed by the main program option parser. Hence case
 249 // is significant for any option added that might be in conflict with
 250 // glutlib's parser.
 251 //
 252 // glutlib parses for:
 253 //    -display
 254 //    -direct   (invalid in Win32)
 255 //    -geometry
 256 //    -gldebug
 257 //    -iconized
 258 //    -indirect (invalid in Win32)
 259 //    -synce
 260 //
 261 // Note that glutlib depends upon strings while this program's
 262 // option parser wants only initial characters followed by numbers
 263 // or pathnames.
 264 //
 265
 266
 267 ssgSimpleState *cloud3d_imposter_state;
 268 ssgSimpleState *default_state;
 269 ssgSimpleState *hud_and_panel;
 270 ssgSimpleState *menus;
 271
 272 SGTimeStamp last_time_stamp;
 273 SGTimeStamp current_time_stamp;
 274
 275 void fgBuildRenderStates( void ) {
 276     default_state = new ssgSimpleState;
 277     default_state->ref();
 278     default_state->disable( GL_TEXTURE_2D );
 279     default_state->enable( GL_CULL_FACE );
 280     default_state->enable( GL_COLOR_MATERIAL );
 281     default_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 282     default_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 283     default_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 284     default_state->disable( GL_BLEND );
 285     default_state->disable( GL_ALPHA_TEST );
 286     default_state->disable( GL_LIGHTING );
 287
 288     cloud3d_imposter_state = new ssgSimpleState;
 289     cloud3d_imposter_state->ref();
 290     cloud3d_imposter_state->enable( GL_TEXTURE_2D );
 291     cloud3d_imposter_state->enable( GL_CULL_FACE );
 292     cloud3d_imposter_state->enable( GL_COLOR_MATERIAL );
 293     cloud3d_imposter_state->setColourMaterial( GL_AMBIENT_AND_DIFFUSE );
 294     cloud3d_imposter_state->setMaterial( GL_DIFFUSE, 1, 1, 1, 1 );
 295     cloud3d_imposter_state->setMaterial( GL_AMBIENT, 1, 1, 1, 1 );
 296     cloud3d_imposter_state->setMaterial( GL_EMISSION, 0, 0, 0, 1 );
 297     cloud3d_imposter_state->setMaterial( GL_SPECULAR, 0, 0, 0, 1 );
 298     cloud3d_imposter_state->enable( GL_BLEND );
 299     cloud3d_imposter_state->enable( GL_ALPHA_TEST );
 300     cloud3d_imposter_state->disable( GL_LIGHTING );
 301
 302     hud_and_panel = new ssgSimpleState;
 303     hud_and_panel->ref();
 304     hud_and_panel->disable( GL_CULL_FACE );
 305     hud_and_panel->disable( GL_TEXTURE_2D );
 306     hud_and_panel->disable( GL_LIGHTING );
 307     hud_and_panel->enable( GL_BLEND );
 308
 309     menus = new ssgSimpleState;
 310     menus->ref();
 311     menus->disable( GL_CULL_FACE );
 312     menus->disable( GL_TEXTURE_2D );
 313     menus->enable( GL_BLEND );
 314 }
 315
 316
 317 // fgInitVisuals() -- Initialize various GL/view parameters
 318 void fgInitVisuals( void ) {
 319     fgLIGHT *l;
 320
 321     l = &cur_light_params;
 322
 323 #ifndef GLUT_WRONG_VERSION
 324     // Go full screen if requested ...
 325     if ( fgGetBool("/sim/startup/fullscreen") ) {
 326         glutFullScreen();
 327     }
 328 #endif
 329
 330     // If enabled, normal vectors specified with glNormal are scaled
 331     // to unit length after transformation.  Enabling this has
 332     // performance implications.  See the docs for glNormal.
 333     // glEnable( GL_NORMALIZE );
 334
 335     glEnable( GL_LIGHTING );
 336     glEnable( GL_LIGHT0 );
 337     // glLightfv( GL_LIGHT0, GL_POSITION, l->sun_vec );  // done later with ssg
 338
 339     sgVec3 sunpos;
 340     sgSetVec3( sunpos, l->sun_vec[0], l->sun_vec[1], l->sun_vec[2] );
 341     ssgGetLight( 0 ) -> setPosition( sunpos );
 342
 343     glFogi (GL_FOG_MODE, GL_EXP2);
 344     if ( (!strcmp(fgGetString("/sim/rendering/fog"), "disabled")) ||
 345          (!fgGetBool("/sim/rendering/shading"))) {
 346         // if fastest fog requested, or if flat shading force fastest
 347         glHint ( GL_FOG_HINT, GL_FASTEST );
 348     } else if ( !strcmp(fgGetString("/sim/rendering/fog"), "nicest") ) {
 349         glHint ( GL_FOG_HINT, GL_NICEST );
 350     }
 351     if ( fgGetBool("/sim/rendering/wireframe") ) {
 352         // draw wire frame
 353         glPolygonMode( GL_FRONT_AND_BACK, GL_LINE );
 354     }
 355
 356     // This is the default anyways, but it can't hurt
 357     glFrontFace ( GL_CCW );
 358
 359     // Just testing ...
 360     // glEnable(GL_POINT_SMOOTH);
 361     // glEnable(GL_LINE_SMOOTH);
 362     // glEnable(GL_POLYGON_SMOOTH);
 363 }
 364
 365
 366 // For HiRes screen Dumps using Brian Pauls TR Library
 367 void trRenderFrame( void ) {
 368
 369     if ( fgPanelVisible() ) {
 370         GLfloat height = fgGetInt("/sim/startup/ysize");
 371         GLfloat view_h =
 372             (current_panel->getViewHeight() - current_panel->getYOffset())
 373             * (height / 768.0) + 1;
 374         glTranslatef( 0.0, view_h, 0.0 );
 375     }
 376
 377     static GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 378     static GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 379
 380     fgLIGHT *l = &cur_light_params;
 381
 382     glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 383                  l->adj_fog_color[2], l->adj_fog_color[3]);
 384
 385     glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
 386
 387     // set the opengl state to known default values
 388     default_state->force();
 389
 390     glEnable( GL_FOG );
 391     glFogf  ( GL_FOG_DENSITY, fog_exp2_density);
 392     glFogi  ( GL_FOG_MODE,    GL_EXP2 );
 393     glFogfv ( GL_FOG_COLOR,   l->adj_fog_color );
 394
 395     // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 396     // we only update GL_AMBIENT for our lights we will never get
 397     // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 398     // explicitely to black.
 399     glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 400     glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
 401
 402     ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 403
 404     // texture parameters
 405     glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 406     glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 407
 408     // we need a white diffuse light for the phase of the moon
 409     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 410     thesky->preDraw();
 411
 412     // draw the ssg scene
 413     // return to the desired diffuse color
 414     ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 415     glEnable( GL_DEPTH_TEST );
 416     ssgSetNearFar( scene_nearplane, scene_farplane );
 417     ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 418
 419     // draw the lights
 420     glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 421     ssgSetNearFar( scene_nearplane, scene_farplane );
 422     ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 423
 424     ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 425
 426     if (fgGetBool("/environment/clouds/status"))
 427         thesky->postDraw( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER );
 428
 429     globals->get_model_mgr()->draw();
 430     globals->get_aircraft_model()->draw();
 431 }
 432
 433
 434 // Update all Visuals (redraws anything graphics related)
 435 void fgRenderFrame() {
 436
 437     GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 438     GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 439
 440     // Process/manage pending events
 441     global_events.update( delta_time_sec );
 442
 443     static const SGPropertyNode *longitude
 444         = fgGetNode("/position/longitude-deg");
 445     static const SGPropertyNode *latitude
 446         = fgGetNode("/position/latitude-deg");
 447     static const SGPropertyNode *altitude
 448         = fgGetNode("/position/altitude-ft");
 449     static const SGPropertyNode *groundlevel_nearplane
 450         = fgGetNode("/sim/current-view/ground-level-nearplane-m");
 451
 452     // Update the default (kludged) properties.
 453     fgUpdateProps();
 454
 455     FGViewer *current__view = globals->get_current_view();
 456
 457     fgLIGHT *l = &cur_light_params;
 458     static double last_visibility = -9999;
 459
 460     // update fog params
 461     double actual_visibility;
 462     if (fgGetBool("/environment/clouds/status"))
 463         actual_visibility = thesky->get_visibility();
 464     else
 465         actual_visibility = fgGetDouble("/environment/visibility-m");
 466     if ( actual_visibility != last_visibility ) {
 467         last_visibility = actual_visibility;
 468
 469         fog_exp_density = m_log01 / actual_visibility;
 470         fog_exp2_density = sqrt_m_log01 / actual_visibility;
 471         ground_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 472         if ( actual_visibility < 8000 ) {
 473             rwy_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 2.5);
 474             taxi_exp2_punch_through = sqrt_m_log01 / (actual_visibility * 1.5);
 475         } else {
 476             rwy_exp2_punch_through = sqrt_m_log01 / ( 8000 * 2.5 );
 477             taxi_exp2_punch_through = sqrt_m_log01 / ( 8000 * 1.5 );
 478         }
 479     }
 480
 481     // double angle;
 482     // GLfloat black[4] = { 0.0, 0.0, 0.0, 1.0 };
 483     // GLfloat white[4] = { 1.0, 1.0, 1.0, 1.0 };
 484     // GLfloat terrain_color[4] = { 0.54, 0.44, 0.29, 1.0 };
 485     // GLfloat mat_shininess[] = { 10.0 };
 486     GLbitfield clear_mask;
 487
 488     if ( idle_state != 1000 ) {
 489         // still initializing, draw the splash screen
 490         if ( fgGetBool("/sim/startup/splash-screen") ) {
 491             fgSplashUpdate(0.0, 1.0);
 492         }
 493         // Keep resetting sim time while the sim is initializing
 494         globals->set_sim_time_sec( 0.0 );
 495     } else {
 496         // idle_state is now 1000 meaning we've finished all our
 497         // initializations and are running the main loop, so this will
 498         // now work without seg faulting the system.
 499
 500         // calculate our current position in cartesian space
 501         globals->get_scenery()->set_center( globals->get_scenery()->get_next_center() );
 502
 503         // update view port
 504         fgReshape( fgGetInt("/sim/startup/xsize"),
 505                    fgGetInt("/sim/startup/ysize") );
 506
 507         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 508             glClear( GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT );
 509             cloud3d_imposter_state->force();
 510             glDisable( GL_FOG );
 511             glColor4f( 1.0, 1.0, 1.0, 1.0 );
 512             glEnable(GL_DEPTH_TEST);
 513             glEnable(GL_BLEND);
 514             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 515
 516 #ifdef FG_USE_CLOUDS_3D
 517             if ( _bcloud_orig ) {
 518                 Point3D c = globals->get_scenery()->get_center();
 519                 sgClouds3d->Set_Cloud_Orig( &c );
 520                 _bcloud_orig = false;
 521             }
 522             sgClouds3d->Update( current__view->get_absolute_view_pos() );
 523 #endif
 524             glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 525             glDisable(GL_DEPTH_TEST);
 526         }
 527
 528         clear_mask = GL_DEPTH_BUFFER_BIT;
 529         if ( fgGetBool("/sim/rendering/wireframe") ) {
 530             clear_mask |= GL_COLOR_BUFFER_BIT;
 531         }
 532
 533         if ( fgGetBool("/sim/rendering/skyblend") ) {
 534             if ( fgGetBool("/sim/rendering/textures") ) {
 535                 // glClearColor(black[0], black[1], black[2], black[3]);
 536                 glClearColor(l->adj_fog_color[0], l->adj_fog_color[1],
 537                              l->adj_fog_color[2], l->adj_fog_color[3]);
 538                 clear_mask |= GL_COLOR_BUFFER_BIT;
 539             }
 540         } else {
 541             glClearColor(l->sky_color[0], l->sky_color[1],
 542                          l->sky_color[2], l->sky_color[3]);
 543             clear_mask |= GL_COLOR_BUFFER_BIT;
 544         }
 545         glClear( clear_mask );
 546
 547         // Tell GL we are switching to model view parameters
 548
 549         // I really should create a derived ssg node or use a call
 550         // back or something so that I can draw the sky within the
 551         // ssgCullAndDraw() function, but for now I just mimic what
 552         // ssg does to set up the model view matrix
 553         glMatrixMode(GL_MODELVIEW);
 554         glLoadIdentity();
 555         ssgSetCamera( (sgVec4 *)current__view->get_VIEW() );
 556
 557         // set the opengl state to known default values
 558         default_state->force();
 559
 560         // update fog params if visibility has changed
 561         double visibility_meters = fgGetDouble("/environment/visibility-m");
 562         thesky->set_visibility(visibility_meters);
 563
 564         thesky->modify_vis( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
 565                             ( global_multi_loop * fgGetInt("/sim/speed-up") )
 566                             / (double)fgGetInt("/sim/model-hz") );
 567
 568         // Set correct opengl fog density
 569         glFogf (GL_FOG_DENSITY, fog_exp2_density);
 570
 571         // update the sky dome
 572         if ( fgGetBool("/sim/rendering/skyblend") ) {
 573             /* cout << "thesky->repaint() sky_color = "
 574                  << cur_light_params.sky_color[0] << " "
 575                  << cur_light_params.sky_color[1] << " "
 576                  << cur_light_params.sky_color[2] << " "
 577                  << cur_light_params.sky_color[3] << endl;
 578             cout << "    fog = "
 579                  << cur_light_params.fog_color[0] << " "
 580                  << cur_light_params.fog_color[1] << " "
 581                  << cur_light_params.fog_color[2] << " "
 582                  << cur_light_params.fog_color[3] << endl;
 583             cout << "    sun_angle = " << cur_light_params.sun_angle
 584                  << "    moon_angle = " << cur_light_params.moon_angle
 585                  << endl; */
 586             thesky->repaint( cur_light_params.sky_color,
 587                              cur_light_params.adj_fog_color,
 588                              cur_light_params.sun_angle,
 589                              cur_light_params.moon_angle,
 590                              globals->get_ephem()->getNumPlanets(),
 591                              globals->get_ephem()->getPlanets(),
 592                              globals->get_ephem()->getNumStars(),
 593                              globals->get_ephem()->getStars() );
 594
 595             /* cout << "thesky->reposition( view_pos = " << view_pos[0] << " "
 596                  << view_pos[1] << " " << view_pos[2] << endl;
 597             cout << "    zero_elev = " << zero_elev[0] << " "
 598                  << zero_elev[1] << " " << zero_elev[2]
 599                  << " lon = " << cur_fdm_state->get_Longitude()
 600                  << " lat = " << cur_fdm_state->get_Latitude() << endl;
 601             cout << "    sun_rot = " << cur_light_params.sun_rotation
 602                  << " gst = " << SGTime::cur_time_params->getGst() << endl;
 603             cout << "    sun ra = " << globals->get_ephem()->getSunRightAscension()
 604                  << " sun dec = " << globals->get_ephem()->getSunDeclination()
 605                  << " moon ra = " << globals->get_ephem()->getMoonRightAscension()
 606                  << " moon dec = " << globals->get_ephem()->getMoonDeclination() << endl; */
 607
 608             thesky->reposition( current__view->get_view_pos(),
 609                                 current__view->get_zero_elev(),
 610                                 current__view->get_world_up(),
 611                                 current__view->getLongitude_deg()
 612                                   * SGD_DEGREES_TO_RADIANS,
 613                                 current__view->getLatitude_deg()
 614                                   * SGD_DEGREES_TO_RADIANS,
 615                                 current__view->getAltitudeASL_ft() * SG_FEET_TO_METER,
 616                                 cur_light_params.sun_rotation,
 617                                 globals->get_time_params()->getGst(),
 618                                 globals->get_ephem()->getSunRightAscension(),
 619                                 globals->get_ephem()->getSunDeclination(),
 620                                 50000.0,
 621                                 globals->get_ephem()->getMoonRightAscension(),
 622                                 globals->get_ephem()->getMoonDeclination(),
 623                                 50000.0 );
 624         }
 625
 626         glEnable( GL_DEPTH_TEST );
 627         if ( strcmp(fgGetString("/sim/rendering/fog"), "disabled") ) {
 628             glEnable( GL_FOG );
 629             glFogi( GL_FOG_MODE, GL_EXP2 );
 630             glFogfv( GL_FOG_COLOR, l->adj_fog_color );
 631         }
 632
 633         // set sun/lighting parameters
 634         ssgGetLight( 0 ) -> setPosition( l->sun_vec );
 635
 636         // GL_LIGHT_MODEL_AMBIENT has a default non-zero value so if
 637         // we only update GL_AMBIENT for our lights we will never get
 638         // a completely dark scene.  So, we set GL_LIGHT_MODEL_AMBIENT
 639         // explicitely to black.
 640         glLightModelfv( GL_LIGHT_MODEL_AMBIENT, black );
 641
 642         ssgGetLight( 0 ) -> setColour( GL_AMBIENT, l->scene_ambient );
 643         ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 644         ssgGetLight( 0 ) -> setColour( GL_SPECULAR, l->scene_specular );
 645
 646         // texture parameters
 647         // glEnable( GL_TEXTURE_2D );
 648         glTexEnvi( GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE ) ;
 649         glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST ) ;
 650
 651         // glMatrixMode( GL_PROJECTION );
 652         // glLoadIdentity();
 653         ssgSetFOV( current__view->get_h_fov(),
 654                    current__view->get_v_fov() );
 655
 656         double agl =
 657             current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER
 658             - globals->get_scenery()->get_cur_elev();
 659
 660         if ( agl > 10.0 ) {
 661             scene_nearplane = 10.0f;
 662             scene_farplane = 120000.0f;
 663         } else {
 664             scene_nearplane = groundlevel_nearplane->getDoubleValue();
 665             scene_farplane = 120000.0f;
 666         }
 667
 668         ssgSetNearFar( scene_nearplane, scene_farplane );
 669
 670         // $$$ begin - added VS Renganthan 17 Oct 2K
 671         if(objc)
 672           fgUpdateDCS();
 673         // $$$ end - added VS Renganthan 17 Oct 2K
 674
 675 # ifdef FG_NETWORK_OLK
 676         if ( fgGetBool("/sim/networking/network-olk") ) {
 677             sgCoord fgdpos;
 678             other = head->next;             /* put listpointer to start  */
 679             while ( other != tail) {        /* display all except myself */
 680                 if ( strcmp( other->ipadr, fgd_mcp_ip) != 0) {
 681                     other->fgd_sel->select(1);
 682                     sgSetCoord( &fgdpos, other->sgFGD_COORD );
 683                     other->fgd_pos->setTransform( &fgdpos );
 684                 }
 685                 other = other->next;
 686             }
 687
 688             // fgd_sel->select(1);
 689             // sgCopyMat4( sgTUX, current_view.sgVIEW);
 690             // sgCoord fgdpos;
 691             // sgSetCoord( &fgdpos, sgFGD_VIEW );
 692             // fgd_pos->setTransform( &fgdpos);
 693         }
 694 # endif
 695
 696         if ( fgGetBool("/sim/rendering/skyblend") ) {
 697             // draw the sky backdrop
 698
 699             // we need a white diffuse light for the phase of the moon
 700             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, white );
 701
 702             thesky->preDraw();
 703
 704             // return to the desired diffuse color
 705             ssgGetLight( 0 ) -> setColour( GL_DIFFUSE, l->scene_diffuse );
 706         }
 707
 708         // draw the ssg scene
 709         glEnable( GL_DEPTH_TEST );
 710
 711         ssgSetNearFar( scene_nearplane, scene_farplane );
 712         ssgCullAndDraw( globals->get_scenery()->get_scene_graph() );
 713
 714         // This is a bit kludgy.  Every 200 frames, do an extra
 715         // traversal of the scene graph without drawing anything, but
 716         // with the field-of-view set to 360x360 degrees.  This
 717         // ensures that out-of-range random objects that are not in
 718         // the current view frustum will still be freed properly.
 719         static int counter = 0;
 720         counter++;
 721         if (counter == 200) {
 722           sgFrustum f;
 723           f.setFOV(360, 360);
 724                                 // No need to put the near plane too close;
 725                                 // this way, at least the aircraft can be
 726                                 // culled.
 727           f.setNearFar(1000, 1000000);
 728           sgMat4 m;
 729           ssgGetModelviewMatrix(m);
 730           globals->get_scenery()->get_scene_graph()->cull(&f, m, true);
 731           counter = 0;
 732         }
 733
 734         // change state for lighting here
 735
 736         // draw runway lighting
 737         glFogf (GL_FOG_DENSITY, rwy_exp2_punch_through);
 738         ssgSetNearFar( scene_nearplane, scene_farplane );
 739
 740 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 741         // Enable states for drawing points with GL_extension
 742         glEnable(GL_POINT_SMOOTH);
 743
 744         if ( fgGetBool("/sim/rendering/distance-attenuation")
 745              && glutExtensionSupported("GL_EXT_point_parameters") )
 746         {
 747             float quadratic[3] = {1.0, 0.001, 0.0000001};
 748             // makes the points fade as they move away
 749             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT, quadratic);
 750             glPointParameterfEXT(GL_POINT_SIZE_MIN_EXT, 1.0);
 751         }
 752         glPointSize(4.0);
 753
 754         // blending function for runway lights
 755         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA) ;
 756 #endif
 757
 758         glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 759         glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_SPHERE_MAP);
 760         glEnable(GL_TEXTURE_GEN_S);
 761         glEnable(GL_TEXTURE_GEN_T);
 762         glPolygonMode(GL_FRONT, GL_POINT);
 763
 764         // draw runway lighting
 765         ssgCullAndDraw( globals->get_scenery()->get_rwy_lights_root() );
 766
 767         // change punch through and then draw taxi lighting
 768         glFogf ( GL_FOG_DENSITY, fog_exp2_density );
 769         // sgVec3 taxi_fog;
 770         // sgSetVec3( taxi_fog, 0.0, 0.0, 0.0 );
 771         // glFogfv ( GL_FOG_COLOR, taxi_fog );
 772         ssgCullAndDraw( globals->get_scenery()->get_taxi_lights_root() );
 773
 774         // clean up lighting
 775         glPolygonMode(GL_FRONT, GL_FILL);
 776         glDisable(GL_TEXTURE_GEN_S);
 777         glDisable(GL_TEXTURE_GEN_T);
 778
 779         //static int _frame_count = 0;
 780         //if (_frame_count % 30 == 0) {
 781         //  printf("SSG: %s\n", ssgShowStats());
 782         //}
 783         //else {
 784         //  ssgShowStats();
 785         //}
 786         //_frame_count++;
 787
 788
 789 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
 790         if ( fgGetBool("/sim/rendering/distance-attenuation")
 791              && glutExtensionSupported("GL_EXT_point_parameters") )
 792         {
 793             glPointParameterfvEXT(GL_DISTANCE_ATTENUATION_EXT,
 794                                   default_attenuation);
 795         }
 796
 797         glPointSize(1.0);
 798         glDisable(GL_POINT_SMOOTH);
 799 #endif
 800
 801         // draw ground lighting
 802         glFogf (GL_FOG_DENSITY, ground_exp2_punch_through);
 803         ssgCullAndDraw( globals->get_scenery()->get_gnd_lights_root() );
 804
 805         if ( fgGetBool("/sim/rendering/skyblend") ) {
 806             // draw the sky cloud layers
 807             if (fgGetBool("/environment/clouds/status")) {
 808                 thesky->postDraw( cur_fdm_state->get_Altitude()
 809                                   * SG_FEET_TO_METER );
 810             }
 811         }
 812
 813         if ( fgGetBool("/sim/rendering/clouds3d") ) {
 814             glDisable( GL_FOG );
 815             glDisable( GL_LIGHTING );
 816             // cout << "drawing new clouds" << endl;
 817
 818             glEnable(GL_DEPTH_TEST);
 819             glEnable(GL_BLEND);
 820             glBlendFunc( GL_ONE, GL_ONE_MINUS_SRC_ALPHA ) ;
 821
 822             /*
 823             glEnable( GL_TEXTURE_2D );
 824             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
 825             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 826             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
 827             glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
 828             */
 829
 830 #ifdef FG_USE_CLOUDS_3D
 831             sgClouds3d->Draw((sgVec4 *)current__view->get_VIEW());
 832 #endif
 833             glEnable( GL_FOG );
 834             glEnable( GL_LIGHTING );
 835             glEnable( GL_DEPTH_TEST );
 836             glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 837         }
 838
 839         globals->get_model_mgr()->draw();
 840         globals->get_aircraft_model()->draw();
 841
 842         // display HUD && Panel
 843         glDisable( GL_FOG );
 844         glDisable( GL_DEPTH_TEST );
 845         // glDisable( GL_CULL_FACE );
 846         // glDisable( GL_TEXTURE_2D );
 847
 848         // update the controls subsystem
 849         globals->get_controls()->update(delta_time_sec);
 850
 851         hud_and_panel->apply();
 852         fgCockpitUpdate();
 853
 854         // Use the hud_and_panel ssgSimpleState for rendering the ATC output
 855         // This only works properly if called before the panel call
 856         globals->get_ATC_display()->update(delta_time_sec);
 857
 858         // update the panel subsystem
 859         if ( current_panel != NULL ) {
 860             current_panel->update(delta_time_sec);
 861         }
 862         fgUpdate3DPanels();
 863
 864         // We can do translucent menus, so why not. :-)
 865         menus->apply();
 866         glBlendFunc ( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ) ;
 867         puDisplay();
 868         // glDisable ( GL_BLEND ) ;
 869
 870         glEnable( GL_DEPTH_TEST );
 871         glEnable( GL_FOG );
 872
 873         // Fade out the splash screen over the first three seconds.
 874         double t = globals->get_sim_time_sec();
 875         if ( t <= 1.0 ) {
 876             fgSplashUpdate(0.0, 1.0);
 877         } else if ( t <= 3.0) {
 878             fgSplashUpdate(0.0, (3.0 - t) / 2.0);
 879         }
 880     }
 881
 882     glutSwapBuffers();
 883 }
 884
 885
 886 // Update internal time dependent calculations (i.e. flight model)
 887 // FIXME: this distinction is obsolete; all subsystems now get delta
 888 // time on update.
 889 void fgUpdateTimeDepCalcs() {
 890     static bool inited = false;
 891
 892     //SG_LOG(SG_FLIGHT,SG_INFO, "Updating time dep calcs()");
 893
 894     fgLIGHT *l = &cur_light_params;
 895
 896     // Initialize the FDM here if it hasn't been and if we have a
 897     // scenery elevation hit.
 898
 899     // cout << "cur_fdm_state->get_inited() = " << cur_fdm_state->get_inited()
 900     //      << " cur_elev = " << scenery.get_cur_elev() << endl;
 901
 902     if ( !cur_fdm_state->get_inited() &&
 903          globals->get_scenery()->get_cur_elev() > -9990 )
 904     {
 905         SG_LOG(SG_FLIGHT,SG_INFO, "Finally initializing fdm");
 906
 907         cur_fdm_state->init();
 908         if ( cur_fdm_state->get_bound() ) {
 909             cur_fdm_state->unbind();
 910         }
 911         cur_fdm_state->bind();
 912     }
 913
 914     // conceptually, the following block could be done for each fdm
 915     // instance ...
 916     if ( !cur_fdm_state->get_inited() ) {
 917         // do nothing, fdm isn't inited yet
 918     } else {
 919         // we have been inited, and  we are good to go ...
 920
 921         if ( !inited ) {
 922             inited = true;
 923         }
 924
 925         globals->get_autopilot()->update(delta_time_sec);
 926         cur_fdm_state->update(delta_time_sec);
 927     }
 928
 929     globals->get_model_mgr()->update(delta_time_sec);
 930     globals->get_aircraft_model()->update(delta_time_sec);
 931
 932     // update the view angle
 933     globals->get_viewmgr()->update(delta_time_sec);
 934
 935     l->UpdateAdjFog();
 936
 937     // Update solar system
 938     globals->get_ephem()->update( globals->get_time_params()->getMjd(),
 939                                   globals->get_time_params()->getLst(),
 940                                   cur_fdm_state->get_Latitude() );
 941
 942     // Update radio stack model
 943     current_radiostack->update(delta_time_sec);
 944 }
 945
 946
 947 void fgInitTimeDepCalcs( void ) {
 948     // noop for now
 949 }
 950
 951
 952 static const double alt_adjust_ft = 3.758099;
 953 static const double alt_adjust_m = alt_adjust_ft * SG_FEET_TO_METER;
 954
 955
 956 // What should we do when we have nothing else to do?  Let's get ready
 957 // for the next move and update the display?
 958 static void fgMainLoop( void ) {
 959
 960     static const SGPropertyNode *longitude
 961         = fgGetNode("/position/longitude-deg");
 962     static const SGPropertyNode *latitude
 963         = fgGetNode("/position/latitude-deg");
 964     static const SGPropertyNode *altitude
 965         = fgGetNode("/position/altitude-ft");
 966     static const SGPropertyNode *clock_freeze
 967         = fgGetNode("/sim/freeze/clock", true);
 968     static const SGPropertyNode *cur_time_override
 969         = fgGetNode("/sim/time/cur-time-override", true);
 970
 971     // Update the elapsed time.
 972     static bool first_time = true;
 973     if ( first_time ) {
 974         last_time_stamp.stamp();
 975         first_time = false;
 976     }
 977     current_time_stamp.stamp();
 978     delta_time_sec = double(current_time_stamp - last_time_stamp) / 1000000.0;
 979     if (clock_freeze->getBoolValue())
 980         delta_time_sec = 0;
 981     last_time_stamp = current_time_stamp;
 982     globals->inc_sim_time_sec( delta_time_sec );
 983
 984     static long remainder = 0;
 985     long elapsed;
 986 #ifdef FANCY_FRAME_COUNTER
 987     int i;
 988     double accum;
 989 #else
 990     static time_t last_time = 0;
 991     static int frames = 0;
 992 #endif // FANCY_FRAME_COUNTER
 993
 994     SGTime *t = globals->get_time_params();
 995
 996     FGLocation * acmodel_location = 0;
 997     if(cur_fdm_state->getACModel() != 0) {
 998       acmodel_location = (FGLocation *)  cur_fdm_state->getACModel()->get3DModel()->getFGLocation();
 999     }
1000
1001     SG_LOG( SG_ALL, SG_DEBUG, "Running Main Loop");
1002     SG_LOG( SG_ALL, SG_DEBUG, "======= ==== ====");
1003
1004 #ifdef FG_NETWORK_OLK
1005     if ( fgGetBool("/sim/networking/network-olk") ) {
1006         if ( net_is_registered == 0 ) {      // We first have to reg. to fgd
1007             // printf("FGD: Netupdate\n");
1008             fgd_send_com( "A", FGFS_host);   // Send Mat4 data
1009             fgd_send_com( "B", FGFS_host);   // Recv Mat4 data
1010         }
1011     }
1012 #endif
1013
1014 #if defined( ENABLE_PLIB_JOYSTICK )
1015     // Read joystick and update control settings
1016     // if ( fgGetString("/sim/control-mode") == "joystick" )
1017     // {
1018     //    fgJoystickRead();
1019     // }
1020 #elif defined( ENABLE_GLUT_JOYSTICK )
1021     // Glut joystick support works by feeding a joystick handler
1022     // function to glut.  This is taken care of once in the joystick
1023     // init routine and we don't have to worry about it again.
1024 #endif
1025
1026 #ifndef FG_WEATHERCM
1027     globals->get_environment_mgr()->update(delta_time_sec);
1028 #endif
1029
1030     // Fix elevation.  I'm just sticking this here for now, it should
1031     // probably move eventually
1032
1033     /* printf("Before - ground = %.2f  runway = %.2f  alt = %.2f\n",
1034            scenery.get_cur_elev(),
1035            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1036            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1037
1038 // Curt is this code used?  I don't see any problems when I comment it out.
1039     if ( acmodel_location != 0 ) {
1040       if ( acmodel_location->get_cur_elev_m() > -9990 && cur_fdm_state->get_inited() ) {
1041         if ( cur_fdm_state->get_Altitude() * SG_FEET_TO_METER <
1042              (acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0) ) {
1043             // now set aircraft altitude above ground
1044             printf("(*) Current Altitude = %.2f < %.2f forcing to %.2f\n",
1045                    cur_fdm_state->get_Altitude() * SG_FEET_TO_METER,
1046                    acmodel_location->get_cur_elev_m() + alt_adjust_m - 3.0,
1047                    acmodel_location->get_cur_elev_m() + alt_adjust_m );
1048             cur_fdm_state->set_Altitude( (acmodel_location->get_cur_elev_m()
1049                                                 + alt_adjust_m) * SG_METER_TO_FEET );
1050             SG_LOG( SG_ALL, SG_DEBUG,
1051                     "<*> resetting altitude to "
1052                     << cur_fdm_state->get_Altitude() * SG_FEET_TO_METER
1053                     << " meters" );
1054         }
1055       }
1056     }
1057 // End of code in question. (see Curt is this code used? above)
1058
1059     /* printf("Adjustment - ground = %.2f  runway = %.2f  alt = %.2f\n",
1060            scenery.get_cur_elev(),
1061            cur_fdm_state->get_Runway_altitude() * SG_FEET_TO_METER,
1062            cur_fdm_state->get_Altitude() * SG_FEET_TO_METER); */
1063
1064     // cout << "Warp = " << globals->get_warp() << endl;
1065
1066     // update "time"
1067     static bool last_clock_freeze = false;
1068
1069     if ( clock_freeze->getBoolValue() ) {
1070         // clock freeze requested
1071         if ( cur_time_override->getLongValue() == 0 ) {
1072             fgSetLong( "/sim/time/cur-time-override", t->get_cur_time() );
1073             globals->set_warp( 0 );
1074         }
1075     } else {
1076         // no clock freeze requested
1077         if ( last_clock_freeze == true ) {
1078             // clock just unfroze, let's set warp as the difference
1079             // between frozen time and current time so we don't get a
1080             // time jump (and corresponding sky object and lighting
1081             // jump.)
1082             globals->set_warp( cur_time_override->getLongValue() - time(NULL) );
1083             fgSetLong( "/sim/time/cur-time-override", 0 );
1084         }
1085         if ( globals->get_warp_delta() != 0 ) {
1086             globals->inc_warp( globals->get_warp_delta() );
1087         }
1088     }
1089
1090     last_clock_freeze = clock_freeze->getBoolValue();
1091
1092     t->update( longitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1093                latitude->getDoubleValue() * SGD_DEGREES_TO_RADIANS,
1094                cur_time_override->getLongValue(),
1095                globals->get_warp() );
1096
1097     if ( globals->get_warp_delta() != 0 ) {
1098         fgUpdateSkyAndLightingParams();
1099     }
1100
1101     // update magvar model
1102     globals->get_mag()->update( longitude->getDoubleValue()
1103                                   * SGD_DEGREES_TO_RADIANS,
1104                                 latitude->getDoubleValue()
1105                                   * SGD_DEGREES_TO_RADIANS,
1106                                 altitude->getDoubleValue() * SG_FEET_TO_METER,
1107                                 globals->get_time_params()->getJD() );
1108
1109     // Get elapsed time (in usec) for this past frame
1110     elapsed = fgGetTimeInterval();
1111     SG_LOG( SG_ALL, SG_DEBUG,
1112             "Elapsed time interval is = " << elapsed
1113             << ", previous remainder is = " << remainder );
1114
1115     // Calculate frame rate average
1116 #ifdef FANCY_FRAME_COUNTER
1117     /* old fps calculation */
1118     if ( elapsed > 0 ) {
1119         double tmp;
1120         accum = 0.0;
1121         for ( i = FG_FRAME_RATE_HISTORY - 2; i >= 0; i-- ) {
1122             tmp = general.get_frame(i);
1123             accum += tmp;
1124             // printf("frame[%d] = %.2f\n", i, g->frames[i]);
1125             general.set_frame(i+1,tmp);
1126         }
1127         tmp = 1000000.0 / (float)elapsed;
1128         general.set_frame(0,tmp);
1129         // printf("frame[0] = %.2f\n", general.frames[0]);
1130         accum += tmp;
1131         general.set_frame_rate(accum / (float)FG_FRAME_RATE_HISTORY);
1132         // printf("ave = %.2f\n", general.frame_rate);
1133     }
1134 #else
1135     if ( (t->get_cur_time() != last_time) && (last_time > 0) ) {
1136         general.set_frame_rate( frames );
1137         SG_LOG( SG_ALL, SG_DEBUG,
1138                 "--> Frame rate is = " << general.get_frame_rate() );
1139         frames = 0;
1140     }
1141     last_time = t->get_cur_time();
1142     ++frames;
1143 #endif
1144
1145     // Run ATC subsystem
1146     globals->get_ATC_mgr()->update(delta_time_sec);
1147
1148     // Run the AI subsystem
1149     if (fgGetBool("/sim/ai-traffic/enabled"))
1150         globals->get_AI_mgr()->update(delta_time_sec);
1151
1152     // Run flight model
1153
1154     // Calculate model iterations needed for next frame
1155     elapsed += remainder;
1156
1157     global_multi_loop = (long)(((double)elapsed * 0.000001) *
1158                               fgGetInt("/sim/model-hz"));
1159     remainder = elapsed - ( (global_multi_loop*1000000) /
1160                             fgGetInt("/sim/model-hz") );
1161     SG_LOG( SG_ALL, SG_DEBUG,
1162             "Model iterations needed = " << global_multi_loop
1163             << ", new remainder = " << remainder );
1164
1165     // chop max interations to something reasonable if the sim was
1166     // delayed for an excesive amount of time
1167     if ( global_multi_loop > 2.0 * fgGetInt("/sim/model-hz") ) {
1168         global_multi_loop = (int)(2.0 * fgGetInt("/sim/model-hz") );
1169         remainder = 0;
1170     }
1171
1172     // flight model
1173     if ( global_multi_loop > 0 ) {
1174         fgUpdateTimeDepCalcs();
1175     } else {
1176         SG_LOG( SG_ALL, SG_DEBUG,
1177                 "Elapsed time is zero ... we're zinging" );
1178     }
1179
1180     // Do any I/O channel work that might need to be done
1181     globals->get_io()->update( delta_time_sec );
1182
1183     // see if we need to load any deferred-load textures
1184     material_lib.load_next_deferred();
1185
1186     // Run audio scheduler
1187 #ifdef ENABLE_AUDIO_SUPPORT
1188     if ( fgGetBool("/sim/sound/audible")
1189            && globals->get_soundmgr()->is_working() ) {
1190         globals->get_soundmgr()->update( delta_time_sec );
1191     }
1192 #endif
1193
1194     globals->get_subsystem_mgr()->update(delta_time_sec);
1195
1196     //
1197     // Tile Manager updates - see if we need to load any new scenery tiles.
1198     //   this code ties together the fdm, viewer and scenery classes...
1199     //   we may want to move this to it's own class at some point
1200     //
1201     double visibility_meters = fgGetDouble("/environment/visibility-m");
1202     FGViewer *current_view = globals->get_current_view();
1203
1204     // update tile manager for FDM...
1205     // ...only if location is different than the viewer (to avoid duplicating effort)
1206     if( acmodel_location != current_view->getFGLocation() ) {
1207       if( acmodel_location != 0 ) {
1208         globals->get_tile_mgr()->prep_ssg_nodes( acmodel_location,
1209                                                  visibility_meters );
1210         globals->get_tile_mgr()->
1211             update( acmodel_location, visibility_meters,
1212                     acmodel_location->get_absolute_view_pos() );
1213         // save results of update in FGLocation for fdm...
1214         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1215           acmodel_location->
1216               set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1217         }
1218         acmodel_location->
1219             set_tile_center( globals->get_scenery()->get_next_center() );
1220       }
1221     }
1222
1223     globals->get_tile_mgr()->prep_ssg_nodes( current_view->getFGLocation(),
1224                                              visibility_meters );
1225     // update tile manager for view...
1226     // IMPORTANT!!! the tilemgr update for view location _must_ be done last
1227     // after the FDM's until all of Flight Gear code references the viewer's location
1228     // for elevation instead of the "scenery's" current elevation.
1229     FGLocation *view_location = globals->get_current_view()->getFGLocation();
1230     globals->get_tile_mgr()->update( view_location, visibility_meters,
1231                                      current_view->get_absolute_view_pos() );
1232     // save results of update in FGLocation for fdm...
1233     if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1234       current_view->getFGLocation()->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1235     }
1236     current_view->getFGLocation()->set_tile_center( globals->get_scenery()->get_next_center() );
1237
1238     // If fdm location is same as viewer's then we didn't do the update for fdm location
1239     //   above so we need to save the viewer results in the fdm FGLocation as well...
1240     if( acmodel_location == current_view->getFGLocation() ) {
1241       if( acmodel_location != 0 ) {
1242         if ( globals->get_scenery()->get_cur_elev() > -9990 ) {
1243           acmodel_location->set_cur_elev_m( globals->get_scenery()->get_cur_elev() );
1244         }
1245         acmodel_location->set_tile_center( globals->get_scenery()->get_next_center() );
1246       }
1247     }
1248
1249     // END Tile Manager udpates
1250
1251     // redraw display
1252     fgRenderFrame();
1253
1254     SG_LOG( SG_ALL, SG_DEBUG, "" );
1255 }
1256
1257
1258 // This is the top level master main function that is registered as
1259 // our idle funciton
1260
1261 // The first few passes take care of initialization things (a couple
1262 // per pass) and once everything has been initialized fgMainLoop from
1263 // then on.
1264
1265 static void fgIdleFunction ( void ) {
1266     // printf("idle state == %d\n", idle_state);
1267
1268     if ( idle_state == 0 ) {
1269         // Initialize the splash screen right away
1270         if ( fgGetBool("/sim/startup/splash-screen") ) {
1271             fgSplashInit();
1272         }
1273
1274         idle_state++;
1275     } else if ( idle_state == 1 ) {
1276         // Initialize audio support
1277 #ifdef ENABLE_AUDIO_SUPPORT
1278
1279         // Start the intro music
1280         if ( fgGetBool("/sim/startup/intro-music") ) {
1281             SGPath mp3file( globals->get_fg_root() );
1282             mp3file.append( "Sounds/intro.mp3" );
1283
1284             SG_LOG( SG_GENERAL, SG_INFO,
1285                     "Starting intro music: " << mp3file.str() );
1286
1287 #if defined( __CYGWIN__ )
1288             string command = "start /m `cygpath -w " + mp3file.str() + "`";
1289 #elif defined( WIN32 )
1290             string command = "start /m " + mp3file.str();
1291 #else
1292             string command = "mpg123 " + mp3file.str() + "> /dev/null 2>&1";
1293 #endif
1294
1295             system ( command.c_str() );
1296         }
1297 #endif
1298
1299         idle_state++;
1300     } else if ( idle_state == 2 ) {
1301         // These are a few miscellaneous things that aren't really
1302         // "subsystems" but still need to be initialized.
1303
1304 #ifdef USE_GLIDE
1305         if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
1306             grTexLodBiasValue ( GR_TMU0, 1.0 ) ;
1307         }
1308 #endif
1309
1310         idle_state++;
1311     } else if ( idle_state == 3 ) {
1312         // This is the top level init routine which calls all the
1313         // other subsystem initialization routines.  If you are adding
1314         // a subsystem to flightgear, its initialization call should
1315         // located in this routine.
1316         if( !fgInitSubsystems()) {
1317             SG_LOG( SG_GENERAL, SG_ALERT,
1318                     "Subsystem initializations failed ..." );
1319             exit(-1);
1320         }
1321
1322         idle_state++;
1323     } else if ( idle_state == 4 ) {
1324         // setup OpenGL view parameters
1325         fgInitVisuals();
1326
1327         idle_state++;
1328     } else if ( idle_state == 5 ) {
1329
1330         idle_state++;
1331     } else if ( idle_state == 6 ) {
1332         // sleep(1);
1333         idle_state = 1000;
1334
1335         SG_LOG( SG_GENERAL, SG_INFO, "Panel visible = " << fgPanelVisible() );
1336         fgReshape( fgGetInt("/sim/startup/xsize"),
1337                    fgGetInt("/sim/startup/ysize") );
1338     }
1339
1340     if ( idle_state == 1000 ) {
1341         // We've finished all our initialization steps, from now on we
1342         // run the main loop.
1343
1344         glutIdleFunc(fgMainLoop);
1345     } else {
1346         if ( fgGetBool("/sim/startup/splash-screen") ) {
1347             fgSplashUpdate(0.0, 1.0);
1348         }
1349     }
1350 }
1351
1352 // options.cxx needs to see this for toggle_panel()
1353 // Handle new window size or exposure
1354 void fgReshape( int width, int height ) {
1355     int view_h;
1356
1357     if ( (!fgGetBool("/sim/virtual-cockpit"))
1358          && fgPanelVisible() && idle_state == 1000 ) {
1359         view_h = (int)(height * (current_panel->getViewHeight() -
1360                                  current_panel->getYOffset()) / 768.0);
1361     } else {
1362         view_h = height;
1363     }
1364
1365     // for all views
1366     FGViewMgr *viewmgr = globals->get_viewmgr();
1367     for ( int i = 0; i < viewmgr->size(); ++i ) {
1368       viewmgr->get_view(i)->
1369         set_aspect_ratio((float)view_h / (float)width);
1370     }
1371
1372     glViewport( 0, (GLint)(height - view_h), (GLint)(width), (GLint)(view_h) );
1373
1374     fgSetInt("/sim/startup/xsize", width);
1375     fgSetInt("/sim/startup/ysize", height);
1376     guiInitMouse(width, height);
1377
1378     ssgSetFOV( viewmgr->get_current_view()->get_h_fov(),
1379                viewmgr->get_current_view()->get_v_fov() );
1380
1381     fgHUDReshape();
1382
1383 #ifdef FG_USE_CLOUDS_3D
1384     sgClouds3d->Resize( viewmgr->get_current_view()->get_h_fov(),
1385                         viewmgr->get_current_view()->get_v_fov() );
1386 #endif
1387
1388 }
1389
1390 // Initialize GLUT and define a main window
1391 static bool fgGlutInit( int *argc, char **argv ) {
1392
1393 #if !defined( macintosh )
1394     // GLUT will extract all glut specific options so later on we only
1395     // need wory about our own.
1396     glutInit(argc, argv);
1397 #endif
1398
1399     // Define Display Parameters. Clouds3d works best with --bpp32 option
1400     if ( fgGetBool("/sim/rendering/clouds3d") ) {
1401         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE | GLUT_ALPHA );
1402     } else {
1403         glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE );
1404     }
1405
1406     SG_LOG( SG_GENERAL, SG_INFO, "Opening a window: " <<
1407             fgGetInt("/sim/startup/xsize") << "x"
1408             << fgGetInt("/sim/startup/ysize") );
1409
1410     // Define initial window size
1411     glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1412                         fgGetInt("/sim/startup/ysize") );
1413
1414     // Initialize windows
1415     if ( !fgGetBool("/sim/startup/game-mode")) {
1416         // Open the regular window
1417         glutCreateWindow("FlightGear");
1418 #ifndef GLUT_WRONG_VERSION
1419     } else {
1420         // Open the cool new 'game mode' window
1421         char game_mode_str[256];
1422 //#define SYNC_OPENGL_WITH_DESKTOP_SETTINGS
1423 #if defined(WIN32) && defined(SYNC_OPENGL_WITH_DESKTOP_SETTINGS)
1424 #ifndef ENUM_CURRENT_SETTINGS
1425 #define ENUM_CURRENT_SETTINGS       ((DWORD)-1)
1426 #define ENUM_REGISTRY_SETTINGS      ((DWORD)-2)
1427 #endif
1428
1429         DEVMODE dm;
1430         dm.dmSize = sizeof(DEVMODE);
1431         EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &dm);
1432         fgSetInt("/sim/startup/xsize", dm.dmPelsWidth);
1433         fgSetInt("/sim/startup/ysize", dm.dmPelsHeight);
1434         glutInitWindowSize( fgGetInt("/sim/startup/xsize"),
1435                                                 fgGetInt("/sim/startup/ysize") );
1436         sprintf( game_mode_str, "%dx%d:%d@%d",
1437                          dm.dmPelsWidth,
1438                          dm.dmPelsHeight,
1439                          dm.dmBitsPerPel,
1440                          dm.dmDisplayFrequency );
1441 #else
1442         // Open the cool new 'game mode' window
1443         sprintf( game_mode_str, "width=%d height=%d bpp=%d",
1444                  fgGetInt("/sim/startup/xsize"),
1445                  fgGetInt("/sim/startup/ysize"),
1446                  fgGetInt("/sim/rendering/bits-per-pixel"));
1447
1448 #endif // HAVE_WINDOWS_H
1449         SG_LOG( SG_GENERAL, SG_INFO,
1450                 "game mode params = " << game_mode_str );
1451         glutGameModeString( game_mode_str );
1452         glutEnterGameMode();
1453 #endif // GLUT_WRONG_VERSION
1454     }
1455
1456     // This seems to be the absolute earliest in the init sequence
1457     // that these calls will return valid info.  Too bad it's after
1458     // we've already created and sized out window. :-(
1459     general.set_glVendor( (char *)glGetString ( GL_VENDOR ) );
1460     general.set_glRenderer( (char *)glGetString ( GL_RENDERER ) );
1461     general.set_glVersion( (char *)glGetString ( GL_VERSION ) );
1462     SG_LOG( SG_GENERAL, SG_INFO, general.get_glRenderer() );
1463
1464     GLint tmp;
1465     glGetIntegerv( GL_MAX_TEXTURE_SIZE, &tmp );
1466     general.set_glMaxTexSize( tmp );
1467     SG_LOG ( SG_GENERAL, SG_INFO, "Max texture size = " << tmp );
1468
1469     glGetIntegerv( GL_DEPTH_BITS, &tmp );
1470     general.set_glDepthBits( tmp );
1471     SG_LOG ( SG_GENERAL, SG_INFO, "Depth buffer bits = " << tmp );
1472
1473     return true;
1474 }
1475
1476
1477 // Initialize GLUT event handlers
1478 static bool fgGlutInitEvents( void ) {
1479     // call fgReshape() on window resizes
1480     glutReshapeFunc( fgReshape );
1481
1482     // keyboard and mouse callbacks are set in FGInput::init
1483
1484     // call fgMainLoop() whenever there is
1485     // nothing else to do
1486     glutIdleFunc( fgIdleFunction );
1487
1488     // draw the scene
1489     glutDisplayFunc( fgRenderFrame );
1490
1491     return true;
1492 }
1493
1494 // Main top level initialization
1495 static bool fgMainInit( int argc, char **argv ) {
1496
1497 #if defined( macintosh )
1498     freopen ("stdout.txt", "w", stdout );
1499     freopen ("stderr.txt", "w", stderr );
1500     argc = ccommand( &argv );
1501 #endif
1502
1503     // set default log levels
1504     sglog().setLogLevels( SG_ALL, SG_INFO );
1505
1506     string version;
1507 #ifdef FLIGHTGEAR_VERSION
1508     version = FLIGHTGEAR_VERSION;
1509 #else
1510     version = "unknown version";
1511 #endif
1512     SG_LOG( SG_GENERAL, SG_INFO, "FlightGear:  Version "
1513             << version );
1514     SG_LOG( SG_GENERAL, SG_INFO, "Built with " << SG_COMPILER_STR << endl );
1515
1516     // Allocate global data structures.  This needs to happen before
1517     // we parse command line options
1518
1519     globals = new FGGlobals;
1520
1521 #ifndef FG_WEATHERCM
1522     globals->set_environment_mgr(new FGEnvironmentMgr);
1523 #endif
1524
1525     // seed the random number generater
1526     sg_srandom_time();
1527
1528     SGRoute *route = new SGRoute;
1529     globals->set_route( route );
1530
1531     FGControls *controls = new FGControls;
1532     globals->set_controls( controls );
1533
1534     string_list *col = new string_list;
1535     globals->set_channel_options_list( col );
1536
1537     // Scan the config file(s) and command line options to see if
1538     // fg_root was specified (ignore all other options for now)
1539     fgInitFGRoot(argc, argv);
1540
1541     // Check for the correct base package version
1542     static char required_version[] = "0.9.1";
1543     string base_version = fgBasePackageVersion();
1544     if ( !(base_version == required_version) ) {
1545         // tell the operator how to use this application
1546
1547         cerr << endl << "Base package check failed ... " \
1548              << "Found version " << base_version << " at: " \
1549              << globals->get_fg_root() << endl;
1550         cerr << "Please upgrade to version: " << required_version << endl;
1551         exit(-1);
1552     }
1553
1554     // Initialize the Aircraft directory to "" (UIUC)
1555     aircraft_dir = "";
1556
1557     // Load the configuration parameters.  (Command line options
1558     // overrides config file options.  Config file options override
1559     // defaults.)
1560     if ( !fgInitConfig(argc, argv) ) {
1561         SG_LOG( SG_GENERAL, SG_ALERT, "Config option parsing failed ..." );
1562         exit(-1);
1563     }
1564
1565     // Initialize the Window/Graphics environment.
1566     if( !fgGlutInit(&argc, argv) ) {
1567         SG_LOG( SG_GENERAL, SG_ALERT, "GLUT initialization failed ..." );
1568         exit(-1);
1569     }
1570
1571     // Initialize the various GLUT Event Handlers.
1572     if( !fgGlutInitEvents() ) {
1573         SG_LOG( SG_GENERAL, SG_ALERT,
1574                 "GLUT event handler initialization failed ..." );
1575         exit(-1);
1576     }
1577
1578     // Initialize plib net interface
1579     netInit( &argc, argv );
1580
1581     // Initialize ssg (from plib).  Needs to come before we do any
1582     // other ssg stuff, but after opengl/glut has been initialized.
1583     ssgInit();
1584
1585     // Initialize the user interface (we need to do this before
1586     // passing off control to glut and before fgInitGeneral to get our
1587     // fonts !!!
1588     guiInit();
1589
1590 #ifdef GL_EXT_texture_lod_bias
1591     glTexEnvf( GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, -0.5 ) ;
1592 #endif
1593
1594 #ifdef FG_EXPERIMENTAL_POINT_LIGHTING
1595             // get the address of our OpenGL extensions
1596     if ( fgGetBool("/sim/rendering/distance-attenuation") )
1597     {
1598 #ifdef WIN32
1599         glPointParameterfEXT = (PFNGLPOINTPARAMETERFEXTPROC)
1600             wglGetProcAddress("glPointParameterfEXT");
1601         glPointParameterfvEXT = (PFNGLPOINTPARAMETERFVEXTPROC)
1602             wglGetProcAddress("glPointParameterfvEXT");
1603 #elif linux
1604         glPointParameterfEXT = (OpenGLFuncExt)
1605             glXGetProcAddressARB((GLubyte *)"glPointParameterfEXT");
1606         glPointParameterfvEXT = (OpenGLFuncExtv)
1607             glXGetProcAddressARB((GLubyte *)"glPointParameterfvEXT");
1608 #endif
1609    }
1610 #endif
1611
1612     // based on the requested presets, calculate the true starting
1613     // lon, lat
1614     fgInitNav();
1615     fgInitPosition();
1616
1617     SGTime *t = fgInitTime();
1618     globals->set_time_params( t );
1619
1620     // Do some quick general initializations
1621     if( !fgInitGeneral()) {
1622         SG_LOG( SG_GENERAL, SG_ALERT,
1623                 "General initializations failed ..." );
1624         exit(-1);
1625     }
1626
1627     SGPath modelpath( globals->get_fg_root() );
1628     ssgModelPath( (char *)modelpath.c_str() );
1629
1630     // Initialize the global scenery manager
1631     globals->set_scenery( new FGScenery );
1632     globals->get_scenery()->init();
1633     globals->get_scenery()->bind();
1634
1635     // Initialize the global tile manager
1636     globals->set_tile_mgr( new FGTileMgr );
1637
1638     ////////////////////////////////////////////////////////////////////
1639     // Initialize the property-based built-in commands
1640     ////////////////////////////////////////////////////////////////////
1641     fgInitCommands();
1642
1643     ////////////////////////////////////////////////////////////////////
1644     // Initialize the general model subsystem.
1645     ////////////////////////////////////////////////////////////////////
1646
1647     globals->set_model_loader(new FGModelLoader);
1648     globals->set_texture_loader(new FGTextureLoader);
1649     globals->set_model_mgr(new FGModelMgr);
1650     globals->get_model_mgr()->init();
1651     globals->get_model_mgr()->bind();
1652
1653     ////////////////////////////////////////////////////////////////////
1654     // Initialize the 3D aircraft model subsystem.
1655     ////////////////////////////////////////////////////////////////////
1656
1657     globals->set_aircraft_model(new FGAircraftModel);
1658     globals->get_aircraft_model()->init();
1659     globals->get_aircraft_model()->bind();
1660
1661     ////////////////////////////////////////////////////////////////////
1662     // Initialize the view manager subsystem.
1663     ////////////////////////////////////////////////////////////////////
1664
1665     FGViewMgr *viewmgr = new FGViewMgr;
1666     globals->set_viewmgr( viewmgr );
1667     viewmgr->init();
1668     viewmgr->bind();
1669
1670
1671     // Initialize the sky
1672     SGPath ephem_data_path( globals->get_fg_root() );
1673     ephem_data_path.append( "Astro" );
1674     SGEphemeris *ephem = new SGEphemeris( ephem_data_path.c_str() );
1675     ephem->update( globals->get_time_params()->getMjd(),
1676                    globals->get_time_params()->getLst(),
1677                    0.0 );
1678     globals->set_ephem( ephem );
1679
1680                                 // TODO: move to environment mgr
1681     thesky = new SGSky;
1682     SGPath texture_path(globals->get_fg_root());
1683     texture_path.append("Textures");
1684     texture_path.append("Sky");
1685     for (int i = 0; i < FGEnvironmentMgr::MAX_CLOUD_LAYERS; i++) {
1686         SGCloudLayer * layer = new SGCloudLayer(texture_path.str());
1687         thesky->add_cloud_layer(layer);
1688     }
1689
1690
1691     SGPath sky_tex_path( globals->get_fg_root() );
1692     sky_tex_path.append( "Textures" );
1693     sky_tex_path.append( "Sky" );
1694     thesky->texture_path( sky_tex_path.str() );
1695
1696     thesky->build( 550.0, 550.0,
1697                    globals->get_ephem()->getNumPlanets(),
1698                    globals->get_ephem()->getPlanets(), 60000.0,
1699                    globals->get_ephem()->getNumStars(),
1700                    globals->get_ephem()->getStars(), 60000.0 );
1701
1702     // Initialize MagVar model
1703     SGMagVar *magvar = new SGMagVar();
1704     globals->set_mag( magvar );
1705
1706     // airport = new ssgBranch;
1707     // airport->setName( "Airport Lighting" );
1708     // lighting->addKid( airport );
1709
1710     // ADA
1711     fgLoadDCS();
1712     // ADA
1713
1714 #ifdef FG_NETWORK_OLK
1715     // Do the network intialization
1716     if ( fgGetBool("/sim/networking/network-olk") ) {
1717         printf("Multipilot mode %s\n",
1718                fg_net_init( globals->get_scenery()->get_scene_graph() ) );
1719     }
1720 #endif
1721
1722     // build our custom render states
1723     fgBuildRenderStates();
1724
1725     // pass control off to the master GLUT event handler
1726     glutMainLoop();
1727
1728     // we never actually get here ... but to avoid compiler warnings,
1729     // etc.
1730     return false;
1731 }
1732
1733
1734 // $$$ end - added VS Renganathan, 15 Oct 2K
1735 //         - added Venky         , 12 Nov 2K
1736
1737 #if defined(__linux__) && defined(__i386__)
1738
1739 static void handleFPE (int);
1740
1741 static void
1742 initFPE ()
1743 {
1744     fpu_control_t fpe_flags = 0;
1745     _FPU_GETCW(fpe_flags);
1746 //     fpe_flags &= ~_FPU_MASK_IM;      // invalid operation
1747 //     fpe_flags &= ~_FPU_MASK_DM;      // denormalized operand
1748 //     fpe_flags &= ~_FPU_MASK_ZM;      // zero-divide
1749 //     fpe_flags &= ~_FPU_MASK_OM;      // overflow
1750 //     fpe_flags &= ~_FPU_MASK_UM;      // underflow
1751 //     fpe_flags &= ~_FPU_MASK_PM;      // precision (inexact result)
1752     _FPU_SETCW(fpe_flags);
1753     signal(SIGFPE, handleFPE);
1754 }
1755
1756 static void
1757 handleFPE (int num)
1758 {
1759   initFPE();
1760   SG_LOG(SG_GENERAL, SG_ALERT, "Floating point interrupt (SIGFPE)");
1761 }
1762 #endif
1763
1764 #ifdef __APPLE__
1765
1766 typedef struct
1767 {
1768   int  lo;
1769   int  hi;
1770 } PSN;
1771
1772 extern "C" {
1773   short CPSGetCurrentProcess(PSN *psn);
1774   short CPSSetProcessName (PSN *psn, char *processname);
1775   short CPSEnableForegroundOperation(PSN *psn, int _arg2, int _arg3, int _arg4, int _arg5);
1776   short CPSSetFrontProcess(PSN *psn);
1777 };
1778
1779 #define CPSEnableFG(psn) CPSEnableForegroundOperation(psn,0x03,0x3C,0x2C,0x1103)
1780
1781 #endif
1782
1783 // Main entry point; catch any exceptions that have made it this far.
1784 int main ( int argc, char **argv ) {
1785
1786     // Enable floating-point exceptions for Linux/x86
1787 #if defined(__linux__) && defined(__i386__)
1788     initFPE();
1789 #endif
1790
1791     // Enable floating-point exceptions for Windows
1792 #if defined( _MSC_VER ) && defined( DEBUG )
1793     // Christian, we should document what this does
1794     _control87( _EM_INEXACT, _MCW_EM );
1795 #endif
1796
1797 #if defined( HAVE_BC5PLUS )
1798     _control87(MCW_EM, MCW_EM);  /* defined in float.h */
1799 #endif
1800
1801     // Keyboard focus hack
1802 #ifdef __APPLE__
1803     {
1804       PSN psn;
1805
1806       glutInit (&argc, argv);
1807
1808       CPSGetCurrentProcess(&psn);
1809       CPSSetProcessName(&psn, "FlightGear");
1810       CPSEnableFG(&psn);
1811       CPSSetFrontProcess(&psn);
1812     }
1813 #endif
1814
1815     // FIXME: add other, more specific
1816     // exceptions.
1817     try {
1818         fgMainInit(argc, argv);
1819     } catch (sg_throwable &t) {
1820                                 // We must use cerr rather than
1821                                 // logging, since logging may be
1822                                 // disabled.
1823         cerr << "Fatal error: " << t.getFormattedMessage()
1824              << "\n (received from " << t.getOrigin() << ')' << endl;
1825         exit(1);
1826     }
1827
1828     return 0;
1829 }
1830
1831
1832 void fgLoadDCS(void) {
1833
1834     ssgEntity *ship_obj = NULL;
1835
1836     char obj_filename[25];
1837
1838     for ( int k = 0; k < 32; k++ ) {
1839         ship_pos[k]=NULL;
1840     }
1841
1842     SGPath tile_path( globals->get_fg_root());
1843     tile_path.append( "Scenery" );
1844     tile_path.append( "Objects.txt" );
1845     sg_gzifstream in( tile_path.str() );
1846     if ( ! in.is_open() ) {
1847         SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << tile_path.str() );
1848     } else {
1849
1850         SGPath modelpath( globals->get_fg_root() );
1851         modelpath.append( "Models" );
1852         modelpath.append( "Geometry" );
1853
1854         SGPath texturepath( globals->get_fg_root() );
1855         texturepath.append( "Models" );
1856         texturepath.append( "Textures" );
1857
1858         ssgModelPath( (char *)modelpath.c_str() );
1859         ssgTexturePath( (char *)texturepath.c_str() );
1860
1861         ship_sel = new ssgSelector;
1862
1863         char c;
1864         while ( ! in.eof() ) {
1865             in >> ::skipws;
1866             if ( in.get( c ) && c == '#' ) {
1867                 in >> skipeol;
1868             } else {
1869                 in.putback(c);
1870                 in >> obj_filename >> obj_lat[objc] >> obj_lon[objc] >> obj_alt[objc];
1871                 /* cout << endl << obj_filename << " " << obj_lat[objc] << " " << obj_lon[objc] <<  " " << obj_alt[objc] << endl;
1872                    int chj=getchar();*/
1873
1874                 obj_lon[objc] *=SGD_DEGREES_TO_RADIANS;
1875                 obj_lat[objc] *=SGD_DEGREES_TO_RADIANS;
1876
1877                 ship_pos[objc] = new ssgTransform;
1878
1879                 // type "repeat" in objects.txt to load one more
1880                 // instance of the last object.
1881
1882                 if ( strcmp(obj_filename,"repeat") != 0) {
1883                     ship_obj =
1884                         globals->get_model_loader()->load_model( obj_filename );
1885                 }
1886
1887                 if ( ship_obj != NULL ) {
1888                                         ship_obj->setName(obj_filename);
1889                                 if (objc == 0)
1890                                                 ship_obj->clrTraversalMaskBits( SSGTRAV_HOT );
1891                                         else
1892                                                 ship_obj->setTraversalMaskBits( SSGTRAV_HOT );
1893                     ship_pos[objc]->addKid( ship_obj ); // add object to transform node
1894                     ship_sel->addKid( ship_pos[objc] ); // add transform node to selector
1895                     SG_LOG( SG_TERRAIN, SG_ALERT, "Loaded file: "
1896                             << obj_filename );
1897                 } else {
1898                     SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: "
1899                             << obj_filename );
1900                 }
1901
1902                                 // temporary hack for deck lights - ultimately should move to PLib (when??)
1903                                 //const char *extn = file_extension ( obj_filename ) ;
1904                                 if ( objc == 1 ){
1905                                     ssgVertexArray *lights = new ssgVertexArray( 100 );
1906                                         ssgVertexArray *lightpoints = new ssgVertexArray( 100 );
1907                                         ssgVertexArray *lightnormals = new ssgVertexArray( 100 );
1908                                         ssgVertexArray *lightdir = new ssgVertexArray( 100 );
1909                                         int ltype[500], light_type;
1910                                         static int ltcount = 0;
1911                                     string token;
1912                                         sgVec3 rway_dir,rway_normal,lightpt;
1913                                         Point3D node;
1914                                         modelpath.append(obj_filename);
1915                                         sg_gzifstream in1( modelpath.str() );
1916                                         if ( ! in1.is_open() ) {
1917                                                 SG_LOG( SG_TERRAIN, SG_ALERT, "Cannot open file: " << modelpath.str() );
1918                                         } else {
1919                                                 while ( ! in1.eof() ) {
1920                                                         in1 >> ::skipws;
1921                                                         if ( in1.get( c ) && c == '#' ) {
1922                                                                 in1 >> skipeol;
1923                                                         } else {
1924                                                                 in1.putback(c);
1925                                                                 in1 >> token;
1926                                                                 //cout << token << endl;
1927                                                                 if ( token == "runway" ) {
1928                                                                         in1 >> node;
1929                                                                         sgSetVec3 (rway_dir, node[0], node[1], node[2] );
1930                                                                 } else if ( token == "edgelight" ) {
1931                                                                         in1 >> node;
1932                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1933                                                                         light_type = 1;
1934                                                                 } else if ( token == "taxi" ) {
1935                                                                         in1 >> node;
1936                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1937                                                                         light_type = 2;
1938                                                                 } else if ( token == "vasi" ) {
1939                                                                         in1 >> node;
1940                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1941                                                                         light_type = 3;
1942                                                                 } else if ( token == "threshold" ) {
1943                                                                         in1 >> node;
1944                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1945                                                                         light_type = 4;
1946                                                                 } else if ( token == "rabbit" ) {
1947                                                                         in1 >> node;
1948                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1949                                                                         light_type = 5;
1950                                                                 } else if ( token == "ols" ) {
1951                                                                         in1 >> node;
1952                                                                         sgSetVec3 (rway_ols, node[0], node[1], node[2] );
1953                                                                         light_type = 6;
1954                                                                 } else if ( token == "red" ) {
1955                                                                         in1 >> node;
1956                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1957                                                                         light_type = 7;
1958                                                                 } else if ( token == "green" ) {
1959                                                                         in1 >> node;
1960                                                                         sgSetVec3 (rway_normal, node[0], node[1], node[2] );
1961                                                                         light_type = 8;
1962                                                                 } else if ( token == "lp" ) {
1963                                                                         in1 >> node;
1964                                                                         sgSetVec3 (lightpt, node[0], node[1], node[2] );
1965                                                                         lightpoints->add( lightpt );
1966                                                                         lightnormals->add( rway_normal );
1967                                                                         lightdir->add( rway_dir );
1968                                                                         ltype[ltcount]= light_type;
1969                                                                         ltcount++;
1970                                                                 }
1971                                                                 if (in1.eof()) break;
1972                                                         }
1973                                                 }  //while
1974
1975                                                 if ( lightpoints->getNum() ) {
1976                                                         ssgBranch *lightpoints_branch;
1977                                                         long int dummy = -999;
1978                                                         dummy_tile = new FGTileEntry((SGBucket)dummy);
1979                                                         dummy_tile->lightmaps_sequence = new ssgSelector;
1980                                                         dummy_tile->ols_transform = new ssgTransform;
1981
1982                                                         // call function to generate the runway lights
1983                                                         lightpoints_branch =
1984                                                         dummy_tile->gen_runway_lights( lightpoints, lightnormals,
1985                                                                                                                                 lightdir, ltype);
1986                                                         lightpoints_brightness->addKid(lightpoints_branch);
1987                                                         lightpoints_transform->addKid(lightpoints_brightness);
1988                                                     //dummy_tile->lightmaps_sequence->setTraversalMaskBits( SSGTRAV_HOT );
1989                                                         lightpoints_transform->addKid( dummy_tile->lightmaps_sequence );
1990                                                         lightpoints_transform->ref();
1991                                                         globals->get_scenery()->get_gnd_lights_root()->addKid( lightpoints_transform );
1992                                                 }
1993                                         } //if in1
1994                 } //if objc
1995                                 // end hack for deck lights
1996
1997                 objc++;
1998
1999                 if (in.eof()) break;
2000             }
2001         } // while
2002
2003         SG_LOG ( SG_TERRAIN, SG_ALERT, "Finished object processing." );
2004
2005         globals->get_scenery()->get_terrain_branch()->addKid( ship_sel ); //add selector node to root node
2006     }
2007
2008     return;
2009  }
2010
2011
2012 void fgUpdateDCS (void) {
2013
2014     // double eye_lat,eye_lon,eye_alt;
2015     // static double obj_head;
2016     double sl_radius,obj_latgc;
2017     // float nresultmat[4][4];
2018     // sgMat4 Trans,rothead,rotlon,rot180,rotlat,resultmat1,resultmat2,resultmat3;
2019     double bz[3];
2020
2021     // Instantaneous Geodetic Lat/Lon/Alt of moving object
2022     FGADA *fdm = (FGADA *)current_aircraft.fdm_state;
2023
2024     // Deck should be the first object in objects.txt in case of fdm=ada
2025
2026     if (!strcmp(fgGetString("/sim/flight-model"), "ada")) {
2027                 if ((fdm->get_iaux(1))==1)
2028                 {
2029                         obj_lat[1] = fdm->get_daux(1)*SGD_DEGREES_TO_RADIANS;
2030                         obj_lon[1] = fdm->get_daux(2)*SGD_DEGREES_TO_RADIANS;
2031                         obj_alt[1] = fdm->get_daux(3);
2032                         obj_pitch[1] = fdm->get_faux(1);
2033                         obj_roll[1] = fdm->get_faux(2);
2034                 }
2035     }
2036
2037     for ( int m = 0; m < objc; m++ ) {
2038         //cout << endl <<  obj_lat[m]*SGD_RADIANS_TO_DEGREES << " " << obj_lon[m]*SGD_RADIANS_TO_DEGREES << " " << obj_alt[m] << " " << objc << endl;
2039         //int v=getchar();
2040
2041         //Geodetic to Geocentric angles for rotation
2042         sgGeodToGeoc(obj_lat[m],obj_alt[m],&sl_radius,&obj_latgc);
2043
2044         //moving object gbs-posn in cartesian coords
2045         Point3D obj_posn = Point3D( obj_lon[m],obj_lat[m],obj_alt[m]);
2046         Point3D obj_pos = sgGeodToCart( obj_posn );
2047
2048         // Translate moving object w.r.t eye
2049         Point3D Objtrans = obj_pos - globals->get_scenery()->get_center();
2050         bz[0]=Objtrans.x();
2051         bz[1]=Objtrans.y();
2052         bz[2]=Objtrans.z();
2053
2054        // rotate dynamic objects for lat,lon & alt and other motion about its axes
2055
2056         sgMat4 sgTRANS;
2057         sgMakeTransMat4( sgTRANS, bz[0],bz[1],bz[2]);
2058
2059         sgVec3 ship_fwd,ship_rt,ship_up;
2060         sgSetVec3( ship_fwd, 1.0, 0.0, 0.0);//east,roll
2061         sgSetVec3( ship_rt, 0.0, 1.0, 0.0);//up,pitch
2062         sgSetVec3( ship_up, 0.0, 0.0, 1.0); //north,yaw
2063
2064         sgMat4 sgROT_lon, sgROT_lat, sgROT_hdg, sgROT_pitch, sgROT_roll;
2065         sgMakeRotMat4( sgROT_lon, obj_lon[m]*SGD_RADIANS_TO_DEGREES, ship_up );
2066         sgMakeRotMat4( sgROT_lat, 90-obj_latgc*SGD_RADIANS_TO_DEGREES, ship_rt );
2067         sgMakeRotMat4( sgROT_hdg, 180.0, ship_up );
2068         sgMakeRotMat4( sgROT_pitch, obj_pitch[m], ship_rt );
2069         sgMakeRotMat4( sgROT_roll, obj_roll[m], ship_fwd );
2070
2071         sgMat4 sgTUX;
2072         sgCopyMat4( sgTUX, sgROT_hdg );
2073         sgPostMultMat4( sgTUX, sgROT_pitch );
2074         sgPostMultMat4( sgTUX, sgROT_roll );
2075         sgPostMultMat4( sgTUX, sgROT_lat );
2076         sgPostMultMat4( sgTUX, sgROT_lon );
2077         sgPostMultMat4( sgTUX, sgTRANS );
2078
2079         sgCoord shippos;
2080         sgSetCoord(&shippos, sgTUX );
2081         ship_pos[m]->setTransform( &shippos );
2082         // temporary hack for deck lights - ultimately should move to PLib (when ??)
2083         if (m == 1) {
2084                 if (lightpoints_transform) {
2085                         lightpoints_transform->setTransform( &shippos );
2086                         float sun_angle = cur_light_params.sun_angle * SGD_RADIANS_TO_DEGREES;
2087                         if ( sun_angle > 89 ) {
2088                                 lightpoints_brightness->select(0x01);
2089                         } else {
2090                                 lightpoints_brightness->select(0x00);
2091                         }
2092                 }
2093
2094                 float elev;
2095                 sgVec3 rp,to;
2096                 float *vp;
2097                 float alt;
2098                 float ref_elev;
2099                 sgXformPnt3( rp, rway_ols, sgTUX );
2100                 vp = globals->get_current_view()->get_view_pos();
2101             to[0] = rp[0]-vp[0];
2102             to[1] = rp[1]-vp[1];
2103             to[2] = rp[2]-vp[2];
2104                 float dist = sgLengthVec3( to );
2105                 alt = (current_aircraft.fdm_state->get_Altitude() * SG_FEET_TO_METER)-rway_ols[2];
2106
2107                 elev = asin(alt/dist)*SGD_RADIANS_TO_DEGREES;
2108
2109             ref_elev = elev - 3.75; // +ve above, -ve below
2110
2111                 unsigned int sel;
2112                 sel = 0xFF;
2113 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2114 //              if (ref_elev > 0.51) sel = 0x21;
2115 //              if ((ref_elev <= 0.51) & (ref_elev > 0.17)) sel = 0x22;
2116 //              if ((ref_elev <= 0.17) & (ref_elev >= -0.17)) sel = 0x24;
2117 //              if ((ref_elev < -0.17) & (ref_elev >= -0.51)) sel = 0x28;
2118 //              if (ref_elev < -0.51) sel = 0x30;
2119 // DO NOT DELETE THIS CODE - This is to compare a discrete FLOLS (without LOD) with analog FLOLS
2120                 dummy_tile->lightmaps_sequence->select(sel);
2121
2122                 sgVec3 up;
2123                 sgCopyVec3 (up, ship_up);
2124                 if (dist > 750)
2125                         sgScaleVec3 (up, 4.0*ref_elev*dist/750.0);
2126                 else
2127                         sgScaleVec3 (up, 4.0*ref_elev);
2128                 dummy_tile->ols_transform->setTransform(up);
2129                 //cout << "ref_elev  " << ref_elev << endl;
2130         }
2131     // end hack for deck lights
2132
2133     }
2134     if ( ship_sel != NULL ) {
2135         ship_sel->select(0xFFFFFFFE); // first object is ownship, added to acmodel
2136     }
2137 }
2138
2139 // $$$ end - added VS Renganathan, 15 Oct 2K
2140 //           added Venky         , 12 Nov 2K