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flightgear/Main/fg_init.cxx
curt 16d135954c When "Help" is selected from the menu check to see if netscape is running. 
If so, command it to go to the flight gear user guide url.  Otherwise
start a new version of netscape with this url.
1999-03-11 23:09:26 +00:00

932 lines
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//
// fg_init.cxx -- Flight Gear top level initialization routines
//
// Written by Curtis Olson, started August 1997.
//
// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
//
// $Id$
// (Log is kept at end of this file)
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <GL/glut.h>
#include <XGL/xgl.h>
#include <stdio.h>
#include <stdlib.h>
// work around a stdc++ lib bug in some versions of linux, but doesn't
// seem to hurt to have this here for all versions of Linux.
#ifdef linux
# define _G_NO_EXTERN_TEMPLATES
#endif
#include <Include/compiler.h>
#include STL_STRING
#include <Debug/logstream.hxx>
#include <Aircraft/aircraft.hxx>
#include <Airports/simple.hxx>
#include <Astro/sky.hxx>
#include <Astro/stars.hxx>
#include <Astro/solarsystem.hxx>
#include <Autopilot/autopilot.hxx>
#include <Cockpit/cockpit.hxx>
#include <Include/fg_constants.h>
#include <Include/general.hxx>
#include <Joystick/joystick.hxx>
#include <Math/fg_geodesy.hxx>
#include <Math/point3d.hxx>
#include <Math/polar3d.hxx>
#include <Scenery/scenery.hxx>
#include <Scenery/tilemgr.hxx>
#include <Time/event.hxx>
#include <Time/fg_time.hxx>
#include <Time/light.hxx>
#include <Time/sunpos.hxx>
#include <Weather/weather.hxx>
#include "fg_init.hxx"
#include "options.hxx"
#include "views.hxx"
#include "fg_serial.hxx"
#if defined(FX) && defined(XMESA)
#include <GL/xmesa.h>
#endif
FG_USING_STD(string);
extern const char *default_root;
// Set initial position and orientation
int fgInitPosition( void ) {
string id;
FGInterface *f;
f = current_aircraft.fdm_state;
id = current_options.get_airport_id();
if ( id.length() ) {
// set initial position from airport id
fgAIRPORTS airports;
fgAIRPORT a;
FG_LOG( FG_GENERAL, FG_INFO,
"Attempting to set starting position from airport code "
<< id );
airports.load("apt_simple");
if ( ! airports.search( id, &a ) ) {
FG_LOG( FG_GENERAL, FG_ALERT,
"Failed to find " << id << " in database." );
exit(-1);
} else {
f->set_Longitude( a.longitude * DEG_TO_RAD );
f->set_Latitude( a.latitude * DEG_TO_RAD );
}
} else {
// set initial position from default or command line coordinates
f->set_Longitude( current_options.get_lon() * DEG_TO_RAD );
f->set_Latitude( current_options.get_lat() * DEG_TO_RAD );
}
FG_LOG( FG_GENERAL, FG_INFO,
"starting altitude is = " << current_options.get_altitude() );
f->set_Altitude( current_options.get_altitude() * METER_TO_FEET );
fgFDMSetGroundElevation( current_options.get_flight_model(),
(f->get_Altitude() - 3.758099) * FEET_TO_METER );
FG_LOG( FG_GENERAL, FG_INFO,
"Initial position is: ("
<< (f->get_Longitude() * RAD_TO_DEG) << ", "
<< (f->get_Latitude() * RAD_TO_DEG) << ", "
<< (f->get_Altitude() * FEET_TO_METER) << ")" );
return(1);
}
// General house keeping initializations
int fgInitGeneral( void ) {
string root;
char *mesa_win_state;
FG_LOG( FG_GENERAL, FG_INFO, "General Initialization" );
FG_LOG( FG_GENERAL, FG_INFO, "======= ==============" );
root = current_options.get_fg_root();
if ( ! root.length() ) {
// No root path set? Then bail ...
FG_LOG( FG_GENERAL, FG_ALERT,
"Cannot continue without environment variable FG_ROOT"
<< "being defined." );
exit(-1);
}
FG_LOG( FG_GENERAL, FG_INFO, "FG_ROOT = " << root << endl );
#if defined(FX) && defined(XMESA)
// initialize full screen flag
global_fullscreen = false;
if ( strstr ( general.get_glRenderer(), "Glide" ) ) {
// Test for the MESA_GLX_FX env variable
if ( (mesa_win_state = getenv( "MESA_GLX_FX" )) != NULL) {
// test if we are fullscreen mesa/glide
if ( (mesa_win_state[0] == 'f') ||
(mesa_win_state[0] == 'F') ) {
global_fullscreen = true;
}
}
}
#endif
return ( 1 );
}
// This is the top level init routine which calls all the other
// initialization routines. If you are adding a subsystem to flight
// gear, its initialization call should located in this routine.
// Returns non-zero if a problem encountered.
int fgInitSubsystems( void )
{
FGInterface *f; // assigned later
fgLIGHT *l = &cur_light_params;
fgTIME *t = &cur_time_params;
FGView *v = &current_view;
FG_LOG( FG_GENERAL, FG_INFO, "Initialize Subsystems");
FG_LOG( FG_GENERAL, FG_INFO, "========== ==========");
// allocates structures so must happen before any of the flight
// model or control parameters are set
fgAircraftInit(); // In the future this might not be the case.
f = current_aircraft.fdm_state;
// set the initial position
fgInitPosition();
// Initialize the Scenery Management subsystem
if ( fgSceneryInit() ) {
// Scenery initialized ok.
} else {
FG_LOG( FG_GENERAL, FG_ALERT, "Error in Scenery initialization!" );
exit(-1);
}
if( fgTileMgrInit() ) {
// Load the local scenery data
fgTileMgrUpdate();
} else {
FG_LOG( FG_GENERAL, FG_ALERT, "Error in Tile Manager initialization!" );
exit(-1);
}
FG_LOG( FG_GENERAL, FG_DEBUG,
"Current terrain elevation after tile mgr init " <<
scenery.cur_elev );
// Calculate ground elevation at starting point (we didn't have
// tmp_abs_view_pos calculated when fgTileMgrUpdate() was called above
//
// calculalate a cartesian point somewhere along the line between
// the center of the earth and our view position. Doesn't have to
// be the exact elevation (this is good because we don't know it
// yet :-)
// now handled inside of the fgTileMgrUpdate()
/*
geod_pos = Point3D( f->get_Longitude(), f->get_Latitude(), 0.0);
tmp_abs_view_pos = fgGeodToCart(geod_pos);
FG_LOG( FG_GENERAL, FG_DEBUG,
"Initial abs_view_pos = " << tmp_abs_view_pos );
scenery.cur_elev =
fgTileMgrCurElev( f->get_Longitude(), f->get_Latitude(),
tmp_abs_view_pos );
FG_LOG( FG_GENERAL, FG_DEBUG,
"Altitude after update " << scenery.cur_elev );
*/
fgFDMSetGroundElevation( current_options.get_flight_model(),
scenery.cur_elev );
// Reset our altitude if we are below ground
FG_LOG( FG_GENERAL, FG_DEBUG, "Current altitude = " << f->get_Altitude() );
FG_LOG( FG_GENERAL, FG_DEBUG, "Current runway altitude = " <<
f->get_Runway_altitude() );
if ( f->get_Altitude() < f->get_Runway_altitude() + 3.758099) {
f->set_Altitude( f->get_Runway_altitude() + 3.758099 );
}
FG_LOG( FG_GENERAL, FG_INFO,
"Updated position (after elevation adj): ("
<< (f->get_Latitude() * RAD_TO_DEG) << ", "
<< (f->get_Longitude() * RAD_TO_DEG) << ", "
<< (f->get_Altitude() * FEET_TO_METER) << ")" );
// We need to calculate a few more values here that would normally
// be calculated by the FDM so that the v->UpdateViewMath()
// routine doesn't get hosed.
double sea_level_radius_meters;
double lat_geoc;
// Set the FG variables first
fgGeodToGeoc( f->get_Latitude(), f->get_Altitude(),
&sea_level_radius_meters, &lat_geoc);
f->set_Geocentric_Position( lat_geoc, f->get_Longitude(),
f->get_Altitude() +
(sea_level_radius_meters * METER_TO_FEET) );
f->set_Sea_level_radius( sea_level_radius_meters * METER_TO_FEET );
// The following section sets up the flight model EOM parameters
// and should really be read in from one or more files.
// Initial Velocity
f->set_Velocities_Local( 0.0, 0.0, 0.0 );
// Initial Orientation
f->set_Euler_Angles( current_options.get_roll() * DEG_TO_RAD,
current_options.get_pitch() * DEG_TO_RAD,
current_options.get_heading() * DEG_TO_RAD );
// Initial Angular Body rates
f->set_Omega_Body( 7.206685E-05, 0.0, 9.492658E-05 );
f->set_Earth_position_angle( 0.0 );
// Mass properties and geometry values
f->set_Inertias( 8.547270E+01,
1.048000E+03, 3.000000E+03, 3.530000E+03, 0.000000E+00 );
// CG position w.r.t. ref. point
f->set_CG_Position( 0.0, 0.0, 0.0 );
// Initialize the event manager
global_events.Init();
// Output event stats every 60 seconds
global_events.Register( "fgEVENT_MGR::PrintStats()",
fgMethodCallback<fgEVENT_MGR>( &global_events,
&fgEVENT_MGR::PrintStats),
fgEVENT::FG_EVENT_READY, 60000 );
// Initialize the time dependent variables
fgTimeInit(t);
fgTimeUpdate(f, t);
// Initialize view parameters
FG_LOG( FG_GENERAL, FG_DEBUG, "Before v->init()");
v->Init();
FG_LOG( FG_GENERAL, FG_DEBUG, "After v->init()");
v->UpdateViewMath(f);
FG_LOG( FG_GENERAL, FG_DEBUG, " abs_view_pos = " << v->get_abs_view_pos());
v->UpdateWorldToEye(f);
// Build the solar system
//fgSolarSystemInit(*t);
FG_LOG(FG_GENERAL, FG_INFO, "Building SolarSystem");
SolarSystem::theSolarSystem = new SolarSystem(t);
// Initialize the Stars subsystem
if( fgStarsInit() ) {
// Stars initialized ok.
} else {
FG_LOG( FG_GENERAL, FG_ALERT, "Error in Stars initialization!" );
exit(-1);
}
// Initialize the planetary subsystem
// global_events.Register( "fgPlanetsInit()", fgPlanetsInit,
// fgEVENT::FG_EVENT_READY, 600000);
// Initialize the sun's position
// global_events.Register( "fgSunInit()", fgSunInit,
// fgEVENT::FG_EVENT_READY, 30000 );
// Intialize the moon's position
// global_events.Register( "fgMoonInit()", fgMoonInit,
// fgEVENT::FG_EVENT_READY, 600000 );
// register the periodic update of Sun, moon, and planets
global_events.Register( "ssolsysUpdate", solarSystemRebuild,
fgEVENT::FG_EVENT_READY, 600000);
// fgUpdateSunPos() needs a few position and view parameters set
// so it can calculate local relative sun angle and a few other
// things for correctly orienting the sky.
fgUpdateSunPos();
global_events.Register( "fgUpdateSunPos()", fgUpdateSunPos,
fgEVENT::FG_EVENT_READY, 60000);
// Initialize Lighting interpolation tables
l->Init();
// update the lighting parameters (based on sun angle)
global_events.Register( "fgLight::Update()",
fgMethodCallback<fgLIGHT>( &cur_light_params,
&fgLIGHT::Update),
fgEVENT::FG_EVENT_READY, 30000 );
// Initialize the weather modeling subsystem
current_weather.Init();
// Initialize the Cockpit subsystem
if( fgCockpitInit( &current_aircraft )) {
// Cockpit initialized ok.
} else {
FG_LOG( FG_GENERAL, FG_ALERT, "Error in Cockpit initialization!" );
exit(-1);
}
// Initialize the "sky"
fgSkyInit();
// Initialize the flight model subsystem data structures base on
// above values
fgFDMInit( current_options.get_flight_model(), cur_fdm_state,
1.0 / DEFAULT_MODEL_HZ );
// I'm just sticking this here for now, it should probably move
// eventually
scenery.cur_elev = f->get_Runway_altitude() * FEET_TO_METER;
if ( f->get_Altitude() < f->get_Runway_altitude() + 3.758099) {
f->set_Altitude( f->get_Runway_altitude() + 3.758099 );
}
FG_LOG( FG_GENERAL, FG_INFO,
"Updated position (after elevation adj): ("
<< (f->get_Latitude() * RAD_TO_DEG) << ", "
<< (f->get_Longitude() * RAD_TO_DEG) << ", "
<< (f->get_Altitude() * FEET_TO_METER) << ")" );
// end of thing that I just stuck in that I should probably move
// Joystick support
if ( fgJoystickInit() ) {
// Joystick initialized ok.
} else {
FG_LOG( FG_GENERAL, FG_ALERT, "Error in Joystick initialization!" );
}
// Autopilot init added here, by Jeff Goeke-Smith
fgAPInit(&current_aircraft);
// Initialize serial ports
fgSerialInit();
FG_LOG( FG_GENERAL, FG_INFO, endl);
return(1);
}
// $Log$
// Revision 1.70 1999/03/11 23:09:49 curt
// When "Help" is selected from the menu check to see if netscape is running.
// If so, command it to go to the flight gear user guide url. Otherwise
// start a new version of netscape with this url.
//
// Revision 1.69 1999/03/08 21:56:39 curt
// Added panel changes sent in by Friedemann.
// Added a splash screen randomization since we have several nice splash screens.
//
// Revision 1.68 1999/03/02 01:03:15 curt
// Tweaks for building with native SGI compilers.
//
// Revision 1.67 1999/02/26 22:09:48 curt
// Added initial support for native SGI compilers.
//
// Revision 1.66 1999/02/05 21:29:10 curt
// Modifications to incorporate Jon S. Berndts flight model code.
//
// Revision 1.65 1999/02/02 20:13:36 curt
// MSVC++ portability changes by Bernie Bright:
//
// Lib/Serial/serial.[ch]xx: Initial Windows support - incomplete.
// Simulator/Astro/stars.cxx: typo? included <stdio> instead of <cstdio>
// Simulator/Cockpit/hud.cxx: Added Standard headers
// Simulator/Cockpit/panel.cxx: Redefinition of default parameter
// Simulator/Flight/flight.cxx: Replaced cout with FG_LOG. Deleted <stdio.h>
// Simulator/Main/fg_init.cxx:
// Simulator/Main/GLUTmain.cxx:
// Simulator/Main/options.hxx: Shuffled <fg_serial.hxx> dependency
// Simulator/Objects/material.hxx:
// Simulator/Time/timestamp.hxx: VC++ friend kludge
// Simulator/Scenery/tile.[ch]xx: Fixed using std::X declarations
// Simulator/Main/views.hxx: Added a constant
//
// Revision 1.64 1999/02/01 21:15:43 curt
// Removed unused variables.
//
// Revision 1.63 1999/01/27 04:49:19 curt
// Game mode fixes from Norman Vine.
// Initial altitude setting tweaks and fixes (especially for when starting
// below sea level.)
//
// Revision 1.62 1999/01/20 13:42:25 curt
// Tweaked FDM interface.
// Testing check sum support for NMEA serial output.
//
// Revision 1.61 1999/01/08 03:23:57 curt
// Beginning work on compensating for sim time vs. real world time "jitter".
//
// Revision 1.60 1999/01/07 20:25:09 curt
// Updated struct fgGENERAL to class FGGeneral.
//
// Revision 1.59 1998/12/18 23:40:57 curt
// New frame rate counting mechanism.
//
// Revision 1.58 1998/12/09 18:50:25 curt
// Converted "class fgVIEW" to "class FGView" and updated to make data
// members private and make required accessor functions.
//
// Revision 1.57 1998/12/06 14:52:56 curt
// Fixed a problem with the initial starting altitude. "v->abs_view_pos" wasn't
// being calculated correctly at the beginning causing the first terrain
// intersection to fail, returning a ground altitude of zero, causing the plane
// to free fall for one frame, until the ground altitude was corrected, but now
// being under the ground we got a big bounce and the plane always ended up
// upside down.
//
// Revision 1.56 1998/12/06 13:51:23 curt
// Turned "struct fgWEATHER" into "class FGWeather".
//
// Revision 1.55 1998/12/05 15:54:20 curt
// Renamed class fgFLIGHT to class FGState as per request by JSB.
//
// Revision 1.54 1998/12/05 14:19:53 curt
// Looking into a problem with cur_view_params.abs_view_pos initialization.
//
// Revision 1.53 1998/12/03 04:25:05 curt
// Working on fixing up new fgFLIGHT class.
//
// Revision 1.52 1998/12/03 01:17:17 curt
// Converted fgFLIGHT to a class.
//
// Revision 1.51 1998/11/20 01:02:37 curt
// Try to detect Mesa/Glide/Voodoo and chose the appropriate resolution.
//
// Revision 1.50 1998/11/16 14:00:01 curt
// Added pow() macro bug work around.
// Added support for starting FGFS at various resolutions.
// Added some initial serial port support.
// Specify default log levels in main().
//
// Revision 1.49 1998/11/11 00:24:02 curt
// Added Michael Johnson's audio patches for testing.
// Also did a few tweaks to avoid numerical problems when starting at a place
// with no (or bogus) scenery.
//
// Revision 1.48 1998/11/07 19:07:10 curt
// Enable release builds using the --without-logging option to the configure
// script. Also a couple log message cleanups, plus some C to C++ comment
// conversion.
//
// Revision 1.47 1998/11/06 21:18:10 curt
// Converted to new logstream debugging facility. This allows release
// builds with no messages at all (and no performance impact) by using
// the -DFG_NDEBUG flag.
//
// Revision 1.46 1998/10/27 02:14:38 curt
// Changes to support GLUT joystick routines as fall back.
//
// Revision 1.45 1998/10/25 10:57:21 curt
// Changes to use the new joystick library if it is available.
//
// Revision 1.44 1998/10/18 01:17:17 curt
// Point3D tweaks.
//
// Revision 1.43 1998/10/17 01:34:22 curt
// C++ ifying ...
//
// Revision 1.42 1998/10/16 23:27:54 curt
// C++-ifying.
//
// Revision 1.41 1998/10/16 00:54:01 curt
// Converted to Point3D class.
//
// Revision 1.40 1998/10/02 12:46:49 curt
// Added an "auto throttle"
//
// Revision 1.39 1998/09/29 02:03:39 curt
// Autopilot mods.
//
// Revision 1.38 1998/09/15 04:27:30 curt
// Changes for new Astro code.
//
// Revision 1.37 1998/09/15 02:09:26 curt
// Include/fg_callback.hxx
// Moved code inline to stop g++ 2.7 from complaining.
//
// Simulator/Time/event.[ch]xx
// Changed return type of fgEVENT::printStat(). void caused g++ 2.7 to
// complain bitterly.
//
// Minor bugfix and changes.
//
// Simulator/Main/GLUTmain.cxx
// Added missing type to idle_state definition - eliminates a warning.
//
// Simulator/Main/fg_init.cxx
// Changes to airport lookup.
//
// Simulator/Main/options.cxx
// Uses fg_gzifstream when loading config file.
//
// Revision 1.36 1998/09/08 21:40:08 curt
// Fixes by Charlie Hotchkiss.
//
// Revision 1.35 1998/08/29 13:09:26 curt
// Changes to event manager from Bernie Bright.
//
// Revision 1.34 1998/08/27 17:02:06 curt
// Contributions from Bernie Bright <bbright@c031.aone.net.au>
// - use strings for fg_root and airport_id and added methods to return
// them as strings,
// - inlined all access methods,
// - made the parsing functions private methods,
// - deleted some unused functions.
// - propogated some of these changes out a bit further.
//
// Revision 1.33 1998/08/25 20:53:32 curt
// Shuffled $FG_ROOT file layout.
//
// Revision 1.32 1998/08/25 16:59:09 curt
// Directory reshuffling.
//
// Revision 1.31 1998/08/22 14:49:57 curt
// Attempting to iron out seg faults and crashes.
// Did some shuffling to fix a initialization order problem between view
// position, scenery elevation.
//
// Revision 1.30 1998/08/20 20:32:33 curt
// Reshuffled some of the code in and around views.[ch]xx
//
// Revision 1.29 1998/07/30 23:48:27 curt
// Output position & orientation when pausing.
// Eliminated libtool use.
// Added options to specify initial position and orientation.
// Changed default fov to 55 degrees.
// Added command line option to start in paused or unpaused state.
//
// Revision 1.28 1998/07/27 18:41:25 curt
// Added a pause command "p"
// Fixed some initialization order problems between pui and glut.
// Added an --enable/disable-sound option.
//
// Revision 1.27 1998/07/24 21:39:10 curt
// Debugging output tweaks.
// Cast glGetString to (char *) to avoid compiler errors.
// Optimizations to fgGluLookAt() by Norman Vine.
//
// Revision 1.26 1998/07/22 21:40:44 curt
// Clear to adjusted fog color (for sunrise/sunset effects)
// Make call to fog sunrise/sunset adjustment method.
// Add a stdc++ library bug work around to fg_init.cxx
//
// Revision 1.25 1998/07/13 21:01:38 curt
// Wrote access functions for current fgOPTIONS.
//
// Revision 1.24 1998/07/13 15:32:39 curt
// Clear color buffer if drawing wireframe.
// When specifying and airport, start elevation at -1000 and let the system
// position you at ground level.
//
// Revision 1.23 1998/07/12 03:14:43 curt
// Added ground collision detection.
// Did some serious horsing around to be able to "hug" the ground properly
// and still be able to take off.
// Set the near clip plane to 1.0 meters when less than 10 meters above the
// ground.
// Did some serious horsing around getting the initial airplane position to be
// correct based on rendered terrain elevation.
// Added a little cheat/hack that will prevent the view position from ever
// dropping below the terrain, even when the flight model doesn't quite
// put you as high as you'd like.
//
// Revision 1.22 1998/07/04 00:52:25 curt
// Add my own version of gluLookAt() (which is nearly identical to the
// Mesa/glu version.) But, by calculating the Model View matrix our selves
// we can save this matrix without having to read it back in from the video
// card. This hopefully allows us to save a few cpu cycles when rendering
// out the fragments because we can just use glLoadMatrixd() with the
// precalculated matrix for each tile rather than doing a push(), translate(),
// pop() for every fragment.
//
// Panel status defaults to off for now until it gets a bit more developed.
//
// Extract OpenGL driver info on initialization.
//
// Revision 1.21 1998/06/27 16:54:33 curt
// Replaced "extern displayInstruments" with a entry in fgOPTIONS.
// Don't change the view port when displaying the panel.
//
// Revision 1.20 1998/06/17 21:35:12 curt
// Refined conditional audio support compilation.
// Moved texture parameter setup calls to ../Scenery/materials.cxx
// #include <string.h> before various STL includes.
// Make HUD default state be enabled.
//
// Revision 1.19 1998/06/08 17:57:05 curt
// Minor sound/startup position tweaks.
//
// Revision 1.18 1998/06/03 00:47:14 curt
// Updated to compile in audio support if OSS available.
// Updated for new version of Steve's audio library.
// STL includes don't use .h
// Small view optimizations.
//
// Revision 1.17 1998/06/01 17:54:42 curt
// Added Linux audio support.
// avoid glClear( COLOR_BUFFER_BIT ) when not using it to set the sky color.
// map stl tweaks.
//
// Revision 1.16 1998/05/29 20:37:24 curt
// Tweaked material properties & lighting a bit in GLUTmain.cxx.
// Read airport list into a "map" STL for dynamic list sizing and fast tree
// based lookups.
//
// Revision 1.15 1998/05/22 21:28:53 curt
// Modifications to use the new fgEVENT_MGR class.
//
// Revision 1.14 1998/05/20 20:51:35 curt
// Tweaked smooth shaded texture lighting properties.
// Converted fgLIGHT to a C++ class.
//
// Revision 1.13 1998/05/16 13:08:35 curt
// C++ - ified views.[ch]xx
// Shuffled some additional view parameters into the fgVIEW class.
// Changed tile-radius to tile-diameter because it is a much better
// name.
// Added a WORLD_TO_EYE transformation to views.cxx. This allows us
// to transform world space to eye space for view frustum culling.
//
// Revision 1.12 1998/05/13 18:29:58 curt
// Added a keyboard binding to dynamically adjust field of view.
// Added a command line option to specify fov.
// Adjusted terrain color.
// Root path info moved to fgOPTIONS.
// Added ability to parse options out of a config file.
//
// Revision 1.11 1998/05/07 23:14:15 curt
// Added "D" key binding to set autopilot heading.
// Made frame rate calculation average out over last 10 frames.
// Borland C++ floating point exception workaround.
// Added a --tile-radius=n option.
//
// Revision 1.10 1998/05/06 03:16:24 curt
// Added an averaged global frame rate counter.
// Added an option to control tile radius.
//
// Revision 1.9 1998/05/03 00:47:31 curt
// Added an option to enable/disable full-screen mode.
//
// Revision 1.8 1998/04/30 12:34:18 curt
// Added command line rendering options:
// enable/disable fog/haze
// specify smooth/flat shading
// disable sky blending and just use a solid color
// enable wireframe drawing mode
//
// Revision 1.7 1998/04/28 01:20:22 curt
// Type-ified fgTIME and fgVIEW.
// Added a command line option to disable textures.
//
// Revision 1.6 1998/04/26 05:10:03 curt
// "struct fgLIGHT" -> "fgLIGHT" because fgLIGHT is typedef'd.
//
// Revision 1.5 1998/04/25 22:06:30 curt
// Edited cvs log messages in source files ... bad bad bad!
//
// Revision 1.4 1998/04/25 20:24:01 curt
// Cleaned up initialization sequence to eliminate interdependencies
// between sun position, lighting, and view position. This creates a
// valid single pass initialization path.
//
// Revision 1.3 1998/04/25 15:11:11 curt
// Added an command line option to set starting position based on airport ID.
//
// Revision 1.2 1998/04/24 00:49:20 curt
// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
// Trying out some different option parsing code.
// Some code reorganization.
//
// Revision 1.1 1998/04/22 13:25:44 curt
// C++ - ifing the code.
// Starting a bit of reorganization of lighting code.
//
// Revision 1.56 1998/04/18 04:11:28 curt
// Moved fg_debug to it's own library, added zlib support.
//
// Revision 1.55 1998/04/14 02:21:03 curt
// Incorporated autopilot heading hold contributed by: Jeff Goeke-Smith
// <jgoeke@voyager.net>
//
// Revision 1.54 1998/04/08 23:35:36 curt
// Tweaks to Gnu automake/autoconf system.
//
// Revision 1.53 1998/04/03 22:09:06 curt
// Converting to Gnu autoconf system.
//
// Revision 1.52 1998/03/23 21:24:38 curt
// Source code formating tweaks.
//
// Revision 1.51 1998/03/14 00:31:22 curt
// Beginning initial terrain texturing experiments.
//
// Revision 1.50 1998/03/09 22:46:19 curt
// Minor tweaks.
//
// Revision 1.49 1998/02/23 19:07:59 curt
// Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
// calculation code between sun display, and other FG sections that use this
// for things like lighting.
//
// Revision 1.48 1998/02/21 14:53:15 curt
// Added Charlie's HUD changes.
//
// Revision 1.47 1998/02/19 13:05:53 curt
// Incorporated some HUD tweaks from Michelle America.
// Tweaked the sky's sunset/rise colors.
// Other misc. tweaks.
//
// Revision 1.46 1998/02/18 15:07:06 curt
// Tweaks to build with SGI OpenGL (and therefor hopefully other accelerated
// drivers will work.)
//
// Revision 1.45 1998/02/16 13:39:43 curt
// Miscellaneous weekend tweaks. Fixed? a cache problem that caused whole
// tiles to occasionally be missing.
//
// Revision 1.44 1998/02/12 21:59:50 curt
// Incorporated code changes contributed by Charlie Hotchkiss
// <chotchkiss@namg.us.anritsu.com>
//
// Revision 1.43 1998/02/11 02:50:40 curt
// Minor changes.
//
// Revision 1.42 1998/02/09 22:56:58 curt
// Removed "depend" files from cvs control. Other minor make tweaks.
//
// Revision 1.41 1998/02/09 15:07:50 curt
// Minor tweaks.
//
// Revision 1.40 1998/02/07 15:29:44 curt
// Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
// <chotchkiss@namg.us.anritsu.com>
//
// Revision 1.39 1998/02/03 23:20:25 curt
// Lots of little tweaks to fix various consistency problems discovered by
// Solaris' CC. Fixed a bug in fg_debug.c with how the fgPrintf() wrapper
// passed arguments along to the real printf(). Also incorporated HUD changes
// by Michele America.
//
// Revision 1.38 1998/02/02 20:53:58 curt
// Incorporated Durk's changes.
//
// Revision 1.37 1998/02/01 03:39:54 curt
// Minor tweaks.
//
// Revision 1.36 1998/01/31 00:43:13 curt
// Added MetroWorks patches from Carmen Volpe.
//
// Revision 1.35 1998/01/27 00:47:57 curt
// Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
// system and commandline/config file processing code.
//
// Revision 1.34 1998/01/22 02:59:37 curt
// Changed #ifdef FILE_H to #ifdef _FILE_H
//
// Revision 1.33 1998/01/21 21:11:34 curt
// Misc. tweaks.
//
// Revision 1.32 1998/01/19 19:27:08 curt
// Merged in make system changes from Bob Kuehne <rpk@sgi.com>
// This should simplify things tremendously.
//
// Revision 1.31 1998/01/19 18:40:32 curt
// Tons of little changes to clean up the code and to remove fatal errors
// when building with the c++ compiler.
//
// Revision 1.30 1998/01/13 00:23:09 curt
// Initial changes to support loading and management of scenery tiles. Note,
// there's still a fair amount of work left to be done.
//
// Revision 1.29 1998/01/08 02:22:08 curt
// Beginning to integrate Tile management subsystem.
//
// Revision 1.28 1998/01/07 03:18:58 curt
// Moved astronomical stuff from .../Src/Scenery to .../Src/Astro/
//
// Revision 1.27 1998/01/05 18:44:35 curt
// Add an option to advance/decrease time from keyboard.
//
// Revision 1.26 1997/12/30 23:09:04 curt
// Tweaking initialization sequences.
//
// Revision 1.25 1997/12/30 22:22:33 curt
// Further integration of event manager.
//
// Revision 1.24 1997/12/30 20:47:44 curt
// Integrated new event manager with subsystem initializations.
//
// Revision 1.23 1997/12/30 16:36:50 curt
// Merged in Durk's changes ...
//
// Revision 1.22 1997/12/19 23:34:05 curt
// Lot's of tweaking with sky rendering and lighting.
//
// Revision 1.21 1997/12/19 16:45:00 curt
// Working on scene rendering order and options.
//
// Revision 1.20 1997/12/18 23:32:33 curt
// First stab at sky dome actually starting to look reasonable. :-)
//
// Revision 1.19 1997/12/17 23:13:36 curt
// Began working on rendering a sky.
//
// Revision 1.18 1997/12/15 23:54:49 curt
// Add xgl wrappers for debugging.
// Generate terrain normals on the fly.
//
// Revision 1.17 1997/12/15 20:59:09 curt
// Misc. tweaks.
//
// Revision 1.16 1997/12/12 19:52:48 curt
// Working on lightling and material properties.
//
// Revision 1.15 1997/12/11 04:43:55 curt
// Fixed sun vector and lighting problems. I thing the moon is now lit
// correctly.
//
// Revision 1.14 1997/12/10 22:37:47 curt
// Prepended "fg" on the name of all global structures that didn't have it yet.
// i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
//
// Revision 1.13 1997/11/25 19:25:32 curt
// Changes to integrate Durk's moon/sun code updates + clean up.
//
// Revision 1.12 1997/11/15 18:16:35 curt
// minor tweaks.
//
// Revision 1.11 1997/10/30 12:38:42 curt
// Working on new scenery subsystem.
//
// Revision 1.10 1997/10/25 03:24:23 curt
// Incorporated sun, moon, and star positioning code contributed by Durk Talsma.
//
// Revision 1.9 1997/09/23 00:29:39 curt
// Tweaks to get things to compile with gcc-win32.
//
// Revision 1.8 1997/09/22 14:44:20 curt
// Continuing to try to align stars correctly.
//
// Revision 1.7 1997/09/16 15:50:30 curt
// Working on star alignment and time issues.
//
// Revision 1.6 1997/09/05 14:17:30 curt
// More tweaking with stars.
//
// Revision 1.5 1997/09/04 02:17:36 curt
// Shufflin' stuff.
//
// Revision 1.4 1997/08/27 21:32:26 curt
// Restructured view calculation code. Added stars.
//
// Revision 1.3 1997/08/27 03:30:19 curt
// Changed naming scheme of basic shared structures.
//
// Revision 1.2 1997/08/25 20:27:23 curt
// Merged in initial HUD and Joystick code.
//
// Revision 1.1 1997/08/23 01:46:20 curt
// Initial revision.
//
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