flightgear/src/Main/options.cxx

// options.cxx -- class to handle command line options
//
// Written by Curtis Olson, started April 1998.
//
// Copyright (C) 1998  Curtis L. Olson  - curt@me.umn.edu
//
// 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.
//
// $Id$


#ifdef HAVE_CONFIG_H
#  include <config.h>
#endif

#if defined(FX) && defined(XMESA)
bool global_fullscreen = true;
#endif

#include <Include/compiler.h>

#include <math.h>            // rint()
#include <stdio.h>
#include <stdlib.h>          // atof(), atoi()
#include <string.h>

#include STL_STRING

#include <Include/fg_constants.h>
#include <Include/general.hxx>
#include <Cockpit/cockpit.hxx>
#include <Debug/logstream.hxx>
#include <FDM/flight.hxx>
#include <Misc/fgstream.hxx>
#ifdef FG_NETWORK_OLK
#  include <Network/network.h>
#endif
#include <Time/fg_time.hxx>

#include "options.hxx"
#include "fg_serial.hxx"

FG_USING_STD(string);
FG_USING_NAMESPACE(std);

// from GLUTmain.cxx
extern void fgReshape( int width, int height );

inline double
atof( const string& str )
{

#ifdef __MWERKS__ 
    // -dw- if ::atof is called, then we get an infinite loop
    return std::atof( str.c_str() );
#else
    return ::atof( str.c_str() );
#endif
}

inline int
atoi( const string& str )
{
#ifdef __MWERKS__ 
    // -dw- if ::atoi is called, then we get an infinite loop
    return std::atoi( str.c_str() );
#else
    return ::atoi( str.c_str() );
#endif
}

// Defined the shared options class here
fgOPTIONS current_options;


// Constructor
fgOPTIONS::fgOPTIONS() :
    // starting longitude in degrees (west = -)
    // starting latitude in degrees (south = -)

    // Default initial position is Globe, AZ (P13)
    lon(-110.6642444),
    lat(  33.3528917),

    // North of the city of Globe
    // lon(-110.7),
    // lat(  33.4),

    // North of the city of Globe
    // lon(-110.742578),
    // lat(  33.507122),

    // Near where I used to live in Globe, AZ
    // lon(-110.766000),
    // lat(  33.377778),

    // 10125 Jewell St. NE
    // lon(-93.15),
    // lat( 45.15),

    // Near KHSP (Hot Springs, VA)
    // lon(-79.8338964 + 0.01),
    // lat( 37.9514564 + 0.008),

    // (SEZ) SEDONA airport
    // lon(-111.7884614 + 0.01),
    // lat(  34.8486289 - 0.015),

    // Jim Brennon's Kingmont Observatory
    // lon(-121.1131667),
    // lat(  38.8293917),

    // Huaras, Peru (S09d 31.871'  W077d 31.498')
    // lon(-77.5249667),
    // lat( -9.5311833),
 
    // Eclipse Watching w73.5 n10 (approx) 18:00 UT
    // lon(-73.5),
    // lat( 10.0),

    // Timms Hill (WI)
    // lon(-90.1953055556),
    // lat( 45.4511388889),

    // starting altitude in meters (this will be reset to ground level
    // if it is lower than the terrain
    altitude(-9999.0),

    // Initial Orientation
    heading(270.0),      // heading (yaw) angle in degress (Psi)
    roll(0.0),           // roll angle in degrees (Phi)
    pitch(0.424),        // pitch angle in degrees (Theta)

    // Miscellaneous
    game_mode(0),
    splash_screen(1),
    intro_music(1),
    mouse_pointer(0),
    pause(0),

    // Features
    hud_status(1),
    panel_status(0),
    sound(1),

    // Flight Model options
    flight_model(FGInterface::FG_LARCSIM),

    // Rendering options
    fog(FG_FOG_NICEST),  // nicest
    fov(55.0),
    fullscreen(0),
    shading(1),
    skyblend(1),
    textures(1),
    wireframe(0),
    xsize(640),
    ysize(480),

    // Scenery options
    tile_diameter(5),

    // HUD options
    units(FG_UNITS_FEET),
    tris_or_culled(0),
	
    // Time options
    time_offset(0),
    start_gst(0),
    start_lst(0)

{
    // set initial values/defaults
    char* envp = ::getenv( "FG_ROOT" );

    if ( envp != NULL ) {
	// fg_root could be anywhere, so default to environmental
	// variable $FG_ROOT if it is set.
	fg_root = envp;
    } else {
	// Otherwise, default to a random compiled in location if
	// $FG_ROOT is not set.  This can still be overridden from the
	// command line or a config file.

#if defined( WIN32 )
	fg_root = "\\FlightGear";
#elif defined( MACOS )
	fg_root = "";
#else
	fg_root = PKGLIBDIR;
#endif
    }

    airport_id = "";		// default airport id
    net_id = "Johnney";		// default pilot's name

    // initialize port config string list
    port_options_list.erase ( port_options_list.begin(), 
			      port_options_list.end() );
}

void 
fgOPTIONS::toggle_panel() {
    
    FGTime *t = FGTime::cur_time_params;
    
    int toggle_pause = t->getPause();
    
    if( !toggle_pause )
        t->togglePauseMode();
    
    if( panel_status ) {
	panel_status = false;
    } else {
	panel_status = true;
    }
    if ( panel_status ) {
	if( FGPanel::OurPanel == 0)
	    new FGPanel;
	fov *= 0.4232;
    } else {
	fov *= (1.0 / 0.4232);
    }
    fgReshape( xsize, ysize);
    
    if( !toggle_pause )
        t->togglePauseMode();
}

double
fgOPTIONS::parse_time(const string& time_in) {
    char *time_str, num[256];
    double hours, minutes, seconds;
    double result = 0.0;
    int sign = 1;
    int i;

    time_str = (char *)time_in.c_str();

    // printf("parse_time(): %s\n", time_str);

    // check for sign
    if ( strlen(time_str) ) {
	if ( time_str[0] == '+' ) {
	    sign = 1;
	    time_str++;
	} else if ( time_str[0] == '-' ) {
	    sign = -1;
	    time_str++;
	}
    }
    // printf("sign = %d\n", sign);

    // get hours
    if ( strlen(time_str) ) {
	i = 0;
	while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
	    num[i] = time_str[0];
	    time_str++;
	    i++;
	}
	if ( time_str[0] == ':' ) {
	    time_str++;
	}
	num[i] = '\0';
	hours = atof(num);
	// printf("hours = %.2lf\n", hours);

	result += hours;
    }

    // get minutes
    if ( strlen(time_str) ) {
	i = 0;
	while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
	    num[i] = time_str[0];
	    time_str++;
	    i++;
	}
	if ( time_str[0] == ':' ) {
	    time_str++;
	}
	num[i] = '\0';
	minutes = atof(num);
	// printf("minutes = %.2lf\n", minutes);

	result += minutes / 60.0;
    }

    // get seconds
    if ( strlen(time_str) ) {
	i = 0;
	while ( (time_str[0] != ':') && (time_str[0] != '\0') ) {
	    num[i] = time_str[0];
	    time_str++;
	    i++;
	}
	num[i] = '\0';
	seconds = atof(num);
	// printf("seconds = %.2lf\n", seconds);

	result += seconds / 3600.0;
    }

    return(sign * result);
}


long int fgOPTIONS::parse_date( const string& date)
{
    struct tm gmt;
    char * date_str, num[256];
    int i;
    // initialize to zero
    gmt.tm_sec = 0;
    gmt.tm_min = 0;
    gmt.tm_hour = 0;
    gmt.tm_mday = 0;
    gmt.tm_mon = 0;
    gmt.tm_year = 0;
    gmt.tm_isdst = 0; // ignore daylight savingtime for the moment
    date_str = (char *)date.c_str();
    // get year
    if ( strlen(date_str) ) {
	i = 0;
	while ( (date_str[0] != ':') && (date_str[0] != '\0') ) {
	    num[i] = date_str[0];
	    date_str++;
	    i++;
	}
	if ( date_str[0] == ':' ) {
	    date_str++;
	}
	num[i] = '\0';
	gmt.tm_year = atoi(num) - 1900;
    }
    // get month
    if ( strlen(date_str) ) {
	i = 0;
	while ( (date_str[0] != ':') && (date_str[0] != '\0') ) {
	    num[i] = date_str[0];
	    date_str++;
	    i++;
	}
	if ( date_str[0] == ':' ) {
	    date_str++;
	}
	num[i] = '\0';
	gmt.tm_mon = atoi(num) -1;
    }
    // get day
    if ( strlen(date_str) ) {
	i = 0;
	while ( (date_str[0] != ':') && (date_str[0] != '\0') ) {
	    num[i] = date_str[0];
	    date_str++;
	    i++;
	}
	if ( date_str[0] == ':' ) {
	    date_str++;
	}
	num[i] = '\0';
	gmt.tm_mday = atoi(num);
    }
    // get hour
    if ( strlen(date_str) ) {
	i = 0;
	while ( (date_str[0] != ':') && (date_str[0] != '\0') ) {
	    num[i] = date_str[0];
	    date_str++;
	    i++;
	}
	if ( date_str[0] == ':' ) {
	    date_str++;
	}
	num[i] = '\0';
	gmt.tm_hour = atoi(num);
    }
    // get minute
    if ( strlen(date_str) ) {
	i = 0;
	while ( (date_str[0] != ':') && (date_str[0] != '\0') ) {
	    num[i] = date_str[0];
	    date_str++;
	    i++;
	}
	if ( date_str[0] == ':' ) {
	    date_str++;
	}
	num[i] = '\0';
	gmt.tm_min = atoi(num);
    }
    // get second
    if ( strlen(date_str) ) {
	i = 0;
	while ( (date_str[0] != ':') && (date_str[0] != '\0') ) {
	    num[i] = date_str[0];
	    date_str++;
	    i++;
	}
	if ( date_str[0] == ':' ) {
	    date_str++;
	}
	num[i] = '\0';
	gmt.tm_sec = atoi(num);
    }
    time_t theTime = FGTime::cur_time_params->get_gmt(gmt.tm_year,
                                                      gmt.tm_mon,
						      gmt.tm_mday,
						      gmt.tm_hour,
						      gmt.tm_min,
						      gmt.tm_sec);
    //printf ("Date is %s\n", ctime(&theTime));
    //printf ("in seconds that is %d\n", theTime);
    //exit(1);
    return (theTime);
}


// parse degree in the form of [+/-]hhh:mm:ss
double
fgOPTIONS::parse_degree( const string& degree_str) {
    double result = parse_time( degree_str );

    // printf("Degree = %.4f\n", result);

    return(result);
}


// parse time offset command line option
int
fgOPTIONS::parse_time_offset( const string& time_str) {
    int result;

    // printf("time offset = %s\n", time_str);

#ifdef HAVE_RINT
    result = (int)rint(parse_time(time_str) * 3600.0);
#else
    result = (int)(parse_time(time_str) * 3600.0);
#endif

    // printf("parse_time_offset(): %d\n", result);

    return( result );
}


// Parse --tile-diameter=n type option 

int
fgOPTIONS::parse_tile_radius( const string& arg ) {
    int radius = atoi( arg );

    if ( radius < FG_RADIUS_MIN ) { radius = FG_RADIUS_MIN; }
    if ( radius > FG_RADIUS_MAX ) { radius = FG_RADIUS_MAX; }

    // printf("parse_tile_radius(): radius = %d\n", radius);

    return(radius);
}


// Parse --fdm=abcdefg type option 
int
fgOPTIONS::parse_fdm( const string& fm ) {
    // printf("fdm = %s\n", fm);

    if ( fm == "slew" ) {
	return FGInterface::FG_SLEW;
    } else if ( fm == "jsb" ) {
	return FGInterface::FG_JSBSIM;
    } else if ( (fm == "larcsim") || (fm == "LaRCsim") ) {
	return FGInterface::FG_LARCSIM;
    } else if ( fm == "external" ) {
	return FGInterface::FG_EXTERNAL;
    } else {
	FG_LOG( FG_GENERAL, FG_ALERT, "Unknown fdm = " << fm );
	exit(-1);
    }

    // we'll never get here, but it makes the compiler happy.
    return -1;
}


// Parse --fov=x.xx type option 
double
fgOPTIONS::parse_fov( const string& arg ) {
    double fov = atof(arg);

    if ( fov < FG_FOV_MIN ) { fov = FG_FOV_MIN; }
    if ( fov > FG_FOV_MAX ) { fov = FG_FOV_MAX; }

    // printf("parse_fov(): result = %.4f\n", fov);

    return(fov);
}


// Parse serial port option --serial=/dev/ttyS1,nmea,4800,out
//
// Format is "--serial=device,format,baud,direction" where
// 
//  device = OS device name to be open()'ed
//  format = {nmea, garmin,fgfs,rul}
//  baud = {300, 1200, 2400, ..., 230400}
//  direction = {in, out, bi}

bool 
fgOPTIONS::parse_serial( const string& serial_str ) {
    string::size_type pos;

    // cout << "Serial string = " << serial_str << endl;

    // a flailing attempt to see if the port config string has a
    // chance at being valid
    pos = serial_str.find(",");
    if ( pos == string::npos ) {
	FG_LOG( FG_GENERAL, FG_ALERT, 
		"Malformed serial port configure string" );
	return false;
    }
    
    port_options_list.push_back( serial_str );

    return true;
}


// Parse a single option
int fgOPTIONS::parse_option( const string& arg ) {
    // General Options
    if ( (arg == "--help") || (arg == "-h") ) {
	// help/usage request
	return(FG_OPTIONS_HELP);
    } else if ( arg == "--disable-game-mode") {
	game_mode = false;
    } else if ( arg == "--enable-game-mode" ) {
	game_mode = true;
    } else if ( arg == "--disable-splash-screen" ) {
	splash_screen = false;
    } else if ( arg == "--enable-splash-screen" ) {
	splash_screen = true;
    } else if ( arg == "--disable-intro-music" ) {
	intro_music = false;
    } else if ( arg == "--enable-intro-music" ) {
	intro_music = true;
    } else if ( arg == "--disable-mouse-pointer" ) {
	mouse_pointer = 1;
    } else if ( arg == "--enable-mouse-pointer" ) {
	mouse_pointer = 2;
    } else if ( arg == "--disable-pause" ) {
	pause = false;	
    } else if ( arg == "--enable-pause" ) {
	pause = true;	
    } else if ( arg == "--disable-hud" ) {
	hud_status = false;	
    } else if ( arg == "--enable-hud" ) {
	hud_status = true;	
    } else if ( arg == "--disable-panel" ) {
	panel_status = false;
    } else if ( arg == "--enable-panel" ) {
	panel_status = true;
	fov *= 0.4232;
    } else if ( arg == "--disable-sound" ) {
	sound = false;
    } else if ( arg == "--enable-sound" ) {
	sound = true;
    } else if ( arg.find( "--airport-id=") != string::npos ) {
	airport_id = arg.substr( 13 );
    } else if ( arg.find( "--lon=" ) != string::npos ) {
	lon = parse_degree( arg.substr(6) );
    } else if ( arg.find( "--lat=" ) != string::npos ) {
	lat = parse_degree( arg.substr(6) );
    } else if ( arg.find( "--altitude=" ) != string::npos ) {
	if ( units == FG_UNITS_FEET ) {
	    altitude = atof( arg.substr(11) ) * FEET_TO_METER;
	} else {
	    altitude = atof( arg.substr(11) );
	}
    } else if ( arg.find( "--heading=" ) != string::npos ) {
	heading = atof( arg.substr(10) );
    } else if ( arg.find( "--roll=" ) != string::npos ) {
	roll = atof( arg.substr(7) );
    } else if ( arg.find( "--pitch=" ) != string::npos ) {
	pitch = atof( arg.substr(8) );
    } else if ( arg.find( "--fg-root=" ) != string::npos ) {
	fg_root = arg.substr( 10 );
    } else if ( arg.find( "--fdm=" ) != string::npos ) {
	flight_model = parse_fdm( arg.substr(6) );
    } else if ( arg == "--fog-disable" ) {
	fog = FG_FOG_DISABLED;	
    } else if ( arg == "--fog-fastest" ) {
	fog = FG_FOG_FASTEST;	
    } else if ( arg == "--fog-nicest" ) {
	fog = FG_FOG_NICEST;	
    } else if ( arg.find( "--fov=" ) != string::npos ) {
	fov = parse_fov( arg.substr(6) );
    } else if ( arg == "--disable-fullscreen" ) {
	fullscreen = false;	
    } else if ( arg== "--enable-fullscreen") {
	fullscreen = true;	
    } else if ( arg == "--shading-flat") {
	shading = 0;	
    } else if ( arg == "--shading-smooth") {
	shading = 1;	
    } else if ( arg == "--disable-skyblend") {
	skyblend = false;	
    } else if ( arg== "--enable-skyblend" ) {
	skyblend = true;	
    } else if ( arg == "--disable-textures" ) {
	textures = false;	
    } else if ( arg == "--enable-textures" ) {
	textures = true;
    } else if ( arg == "--disable-wireframe" ) {
	wireframe = false;	
    } else if ( arg == "--enable-wireframe" ) {
	wireframe = true;
    } else if ( arg.find( "--geometry=" ) != string::npos ) {
	string geometry = arg.substr( 11 );
	if ( geometry == "640x480" ) {
	    xsize = 640;
	    ysize = 480;
	} else if ( geometry == "800x600" ) {
	    xsize = 800;
	    ysize = 600;
	} else if ( geometry == "1024x768" ) {
	    xsize = 1024;
	    ysize = 768;
	} else {
	    FG_LOG( FG_GENERAL, FG_ALERT, "Unknown geometry: " << geometry );
	    exit(-1);
	}
    } else if ( arg == "--units-feet" ) {
	units = FG_UNITS_FEET;	
    } else if ( arg == "--units-meters" ) {
	units = FG_UNITS_METERS;	
    } else if ( arg.find( "--tile-radius=" ) != string::npos ) {
	tile_radius = parse_tile_radius( arg.substr(14) );
	tile_diameter = tile_radius * 2 + 1;
    } else if ( arg.find( "--time-offset=" ) != string::npos ) {
	time_offset = parse_time_offset( (arg.substr(14)) );
    } else if (arg.find( "--start-date-gmt=") != string::npos ) {
        start_gst = parse_date( (arg.substr(17)) );
    } else if (arg.find( "--start-data-lst=") != string::npos ) {
        start_lst = parse_date( (arg.substr(17)) );
    } else if ( arg == "--hud-tris" ) {
	tris_or_culled = 0;	
    } else if ( arg == "--hud-culled" ) {
	tris_or_culled = 1;
    } else if ( arg.find( "--serial=" ) != string::npos ) {
	parse_serial( arg.substr(9) );
#ifdef FG_NETWORK_OLK
    } else if ( arg == "--net-hud" ) {
	net_hud_display = 1;	
    } else if ( arg.find( "--net-id=") != string::npos ) {
	net_id = arg.substr( 9 );
#endif
    } else {
	FG_LOG( FG_GENERAL, FG_ALERT, "Unknown option '" << arg << "'" );
	return FG_OPTIONS_ERROR;
    }
    
    return FG_OPTIONS_OK;
}


// Parse the command line options
int fgOPTIONS::parse_command_line( int argc, char **argv ) {
    int i = 1;
    int result;

    FG_LOG(FG_GENERAL, FG_INFO, "Processing command line arguments");

    while ( i < argc ) {
	FG_LOG( FG_GENERAL, FG_DEBUG, "argv[" << i << "] = " << argv[i] );

	result = parse_option(argv[i]);
	if ( (result == FG_OPTIONS_HELP) || (result == FG_OPTIONS_ERROR) ) {
	    return(result);
	}

	i++;
    }
    
    return(FG_OPTIONS_OK);
}


// Parse config file options
int fgOPTIONS::parse_config_file( const string& path ) {
    fg_gzifstream in( path );
    if ( !in )
	return(FG_OPTIONS_ERROR);

    FG_LOG( FG_GENERAL, FG_INFO, "Processing config file: " << path );

    in >> skipcomment;
    while ( !in.eof() ) {
	string line;

#ifdef GETLINE_NEEDS_TERMINATOR
	getline( in, line, '\n' );
#else
	getline( in, line );
#endif

	if ( parse_option( line ) == FG_OPTIONS_ERROR ) {
	    FG_LOG( FG_GENERAL, FG_ALERT, 
		    "Config file parse error: " << path << " '" 
		    << line << "'" );
	    exit(-1);
	}
	in >> skipcomment;
    }

    return FG_OPTIONS_OK;
}


// Print usage message
void fgOPTIONS::usage ( void ) {
    printf("Usage: fg [ options ... ]\n");
    printf("\n");

    printf("General Options:\n");
    printf("\t--help -h:  print usage\n");
    printf("\t--fg-root=path:  specify the root path for all the data files\n");
    printf("\t--disable-game-mode:  disable full-screen game mode\n");
    printf("\t--enable-game-mode:  enable full-screen game mode\n");
    printf("\t--disable-splash-screen:  disable splash screen\n");
    printf("\t--enable-splash-screen:  enable splash screen\n");
    printf("\t--disable-intro-music:  disable introduction music\n");
    printf("\t--enable-intro-music:  enable introduction music\n");
    printf("\t--disable-mouse-pointer:  disable extra mouse pointer\n");
    printf("\t--enable-mouse-pointer:  enable extra mouse pointer (i.e. for\n");
    printf("\t\tfull screen voodoo/voodoo-II based cards.)\n");
    printf("\t--disable-pause:  start out in an active state\n");
    printf("\t--enable-pause:  start out in a paused state\n");
    printf("\n");

    printf("Features:\n");
    printf("\t--disable-hud:  disable heads up display\n");
    printf("\t--enable-hud:  enable heads up display\n");
    printf("\t--disable-panel:  disable instrument panel\n");
    printf("\t--enable-panel:  enable instrumetn panel\n");
    printf("\t--disable-sound:  disable sound effects\n");
    printf("\t--enable-sound:  enable sound effects\n");
    printf("\n");
 
    printf("Flight Model:\n");
    printf("\t--fdm=abcd:  one of slew, jsb, larcsim, or external\n");
    printf("\n");

    printf("Initial Position and Orientation:\n");
    printf("\t--airport-id=ABCD:  specify starting postion by airport id\n");
    printf("\t--lon=degrees:  starting longitude in degrees (west = -)\n");
    printf("\t--lat=degrees:  starting latitude in degrees (south = -)\n");
    printf("\t--altitude=feet:  starting altitude in feet\n");
    printf("\t\t(unless --units-meters specified\n");
    printf("\t--heading=degrees:  heading (yaw) angle in degress (Psi)\n");
    printf("\t--roll=degrees:  roll angle in degrees (Phi)\n");
    printf("\t--pitch=degrees:  pitch angle in degrees (Theta)\n");
    printf("\n");

    printf("Rendering Options:\n");
    printf("\t--fog-disable:  disable fog/haze\n");
    printf("\t--fog-fastest:  enable fastest fog/haze\n");
    printf("\t--fog-nicest:  enable nicest fog/haze\n");
    printf("\t--fov=xx.x:  specify initial field of view angle in degrees\n");
    printf("\t--disable-fullscreen:  disable fullscreen mode\n");
    printf("\t--enable-fullscreen:  enable fullscreen mode\n");
    printf("\t--shading-flat:  enable flat shading\n");
    printf("\t--shading-smooth:  enable smooth shading\n");
    printf("\t--disable-skyblend:  disable sky blending\n");
    printf("\t--enable-skyblend:  enable sky blending\n");
    printf("\t--disable-textures:  disable textures\n");
    printf("\t--enable-textures:  enable textures\n");
    printf("\t--disable-wireframe:  disable wireframe drawing mode\n");
    printf("\t--enable-wireframe:  enable wireframe drawing mode\n");
    printf("\t--geometry=WWWxHHH:  window geometry: 640x480, 800x600, etc.\n");
    printf("\n");

    printf("Scenery Options:\n");
    printf("\t--tile-radius=n:  specify tile radius, must be 1 - 4\n");
    printf("\n");

    printf("Hud Options:\n");
    printf("\t--units-feet:  Hud displays units in feet\n");
    printf("\t--units-meters:  Hud displays units in meters\n");
    printf("\t--hud-tris:  Hud displays number of triangles rendered\n");
    printf("\t--hud-culled:  Hud displays percentage of triangles culled\n");
    printf("\n");
	
    printf("Time Options:\n");
    printf("\t--time-offset=[+-]hh:mm:ss:  offset local time by this amount\n");
    printf("\t--start-date-gmt=yyyy:mm:dd:hh:mm:ss: specify a starting date/time. Time is Greenwich Mean Time\n");
    printf("\t--start-date-lst=yyyy:mm:dd:hh:mm:ss: specify a starting date/time. Uses local sidereal time\n");
#ifdef FG_NETWORK_OLK
    printf("\n");

    printf("Network Options:\n");
    printf("\t--net-hud:  Hud displays network info\n");
    printf("\t--net-id=name:  specify your own callsign\n");
#endif
}


// Destructor
fgOPTIONS::~fgOPTIONS( void ) {
}