flightgear/Main/fg_init.cxx

//
// 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 <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <Include/fg_constants.h>
#include <Include/general.h>

#include <Aircraft/aircraft.h>
#include <Astro/moon.hxx>
#include <Astro/planets.hxx>
#include <Astro/sky.hxx>
#include <Astro/stars.hxx>
#include <Astro/sun.hxx>
#include <Autopilot/autopilot.h>
#include <Cockpit/cockpit.hxx>
#include <Debug/fg_debug.h>
#include <Joystick/joystick.h>
#include <Math/fg_random.h>
#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.h>

#include "airports.hxx"
#include "fg_init.hxx"
#include "options.hxx"
#include "views.hxx"


extern const char *default_root;


// Set initial position
int fgInitPosition( void ) {
    fgFLIGHT *f;
    fgOPTIONS *o;

    f = current_aircraft.flight;
    o = &current_options;

    // If nothing else is specified, default initial position is
    // Globe, AZ (P13)
    FG_Longitude = ( -110.6642444 ) * DEG_TO_RAD;
    FG_Latitude  = (  33.3528917 ) * DEG_TO_RAD;
    FG_Runway_altitude = (3234.5 + 300);
    FG_Altitude = FG_Runway_altitude + 3.758099;

    // Initial Position north of the city of Globe
    // FG_Longitude = ( -398673.28 / 3600.0 ) * DEG_TO_RAD;
    // FG_Latitude  = (  120625.64 / 3600.0 ) * DEG_TO_RAD;
    // FG_Longitude = ( -397867.44 / 3600.0 ) * DEG_TO_RAD;
    // FG_Latitude  = (  119548.21 / 3600.0 ) * DEG_TO_RAD;
    // FG_Altitude = 0.0 + 3.758099;

    // Initial Position near where I used to live in Globe, AZ
    // FG_Longitude = ( -398757.6 / 3600.0 ) * DEG_TO_RAD;
    // FG_Latitude  = (  120160.0 / 3600.0 ) * DEG_TO_RAD;
    // FG_Runway_altitude = 4000.0;
    // FG_Altitude = FG_Runway_altitude + 3.758099;

    // Initial Position: 10125 Jewell St. NE
    // FG_Longitude = ( -93.15 ) * DEG_TO_RAD;
    // FG_Latitude  = (  45.15 ) * DEG_TO_RAD;
    // FG_Runway_altitude = 950.0;
    // FG_Altitude = FG_Runway_altitude + 3.758099;

    // Initial Position near KHSP (Hot Springs, VA)
    // FG_Longitude = (-79.8338964 + 0.01) * DEG_TO_RAD;
    // FG_Latitude  = ( 37.9514564 + 0.008) * DEG_TO_RAD;
    // FG_Runway_altitude = (3792 + 2800);
    // FG_Altitude = FG_Runway_altitude + 3.758099;

    // Initial Position at (SEZ) SEDONA airport
    // FG_Longitude = (-111.7884614 + 0.01) * DEG_TO_RAD;
    // FG_Latitude  = (  34.8486289 - 0.015) * DEG_TO_RAD;
    // FG_Runway_altitude = (4827 + 450);
    // FG_Altitude = FG_Runway_altitude + 3.758099;

    // Initial Position: Somewhere near the Grand Canyon
    // FG_Longitude = ( -112.5 ) * DEG_TO_RAD;
    // FG_Latitude  = (  36.5 ) * DEG_TO_RAD;
    // FG_Runway_altitude = 8000.0;
    // FG_Altitude = FG_Runway_altitude + 3.758099;

    // Initial Position: Jim Brennon's Kingmont Observatory
    // FG_Longitude = ( -121.1131667 ) * DEG_TO_RAD;
    // FG_Latitude  = (   38.8293917 ) * DEG_TO_RAD;
    // FG_Runway_altitude = 920.0;
    // FG_Altitude = FG_Runway_altitude + 3.758099;

    // probably interesting for european team members
    // That is: If I can get the scenery to work -;) (Durk)
 
    // Eclipse Watching w73.5 n10 (approx) 18:00 UT
    // FG_Longitude = ( -73.5 ) * DEG_TO_RAD;
    // FG_Latitude  = (  10.0 ) * DEG_TO_RAD;
    // FG_Runway_altitude = 0.0;
    // FG_Altitude = FG_Runway_altitude + 3.758099;

    // Test Position
    // FG_Longitude = (  8.5 ) * DEG_TO_RAD;
    // FG_Latitude  = ( 47.5 ) * DEG_TO_RAD;
    FG_Runway_altitude = ( 6000 );
    FG_Altitude = FG_Runway_altitude + 3.758099;

    if ( strlen(o->airport_id) ) {
	fgAIRPORTS airports;
	fgAIRPORT a;

	fgPrintf( FG_GENERAL, FG_INFO, 
		  "Attempting to set starting position from airport code %s.\n",
		  o->airport_id);

	airports.load("Airports");
	a = airports.search(o->airport_id);
	if ( (fabs(a.longitude) < FG_EPSILON) &&
	     (fabs(a.latitude) < FG_EPSILON) &&
	     (fabs(a.elevation) < FG_EPSILON) ) {
	    fgPrintf( FG_GENERAL, FG_EXIT, 
		      "Failed to find %s in database.\n", o->airport_id);
	} else {
	    FG_Longitude = ( a.longitude ) * DEG_TO_RAD;
	    FG_Latitude  = ( a.latitude ) * DEG_TO_RAD;
	    FG_Runway_altitude = ( a.elevation + 200 );
	    FG_Altitude = FG_Runway_altitude + 3.758099;
	}
    }
    
    fgPrintf( FG_GENERAL, FG_INFO, 
	      "Initial position is: (%.4f, %.4f, %.2f)\n", 
	      FG_Longitude * RAD_TO_DEG, FG_Latitude * RAD_TO_DEG, 
	      FG_Altitude * FEET_TO_METER);

    return(1);
}


// General house keeping initializations
int fgInitGeneral( void ) {
    fgGENERAL *g;
    fgOPTIONS *o;
    int i;

    g = &general;
    o = &current_options;

    fgPrintf( FG_GENERAL, FG_INFO, "General Initialization\n" );
    fgPrintf( FG_GENERAL, FG_INFO, "======= ==============\n" );

    g->glVendor = glGetString ( GL_VENDOR );
    g->glRenderer = glGetString ( GL_RENDERER );
    g->glVersion = glGetString ( GL_VERSION );

    if ( !strlen(o->fg_root) ) { 
	// No root path set? Then assume, we will exit if this is
	// wrong when looking for support files.
	fgPrintf( FG_GENERAL, FG_EXIT, "%s %s\n",
		  "Cannot continue without environment variable FG_ROOT",
		  "being defined.");
    }
    fgPrintf( FG_GENERAL, FG_INFO, "FG_ROOT = %s\n\n", o->fg_root);

    // prime the frame rate counter pump
    for ( i = 0; i < FG_FRAME_RATE_HISTORY; i++ ) {
	g->frames[i] = 0.0;
    }

    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 ) {
    double cur_elev;

    fgFLIGHT *f;
    fgLIGHT *l;
    fgTIME *t;
    fgVIEW *v;

    l = &cur_light_params;
    t = &cur_time_params;
    v = &current_view;

    fgPrintf( FG_GENERAL, FG_INFO, "Initialize Subsystems\n");
    fgPrintf( FG_GENERAL, FG_INFO, "========== ==========\n");

    // seed the random number generater
    fg_srandom();

    // The following section sets up the flight model EOM parameters
    // and should really be read in from one or more files.

    // 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.flight;

    // set the initial position
    fgInitPosition();

    // Initial Velocity
    FG_V_north = 0.0;   //  7.287719E+00
    FG_V_east  = 0.0;   //  1.521770E+03
    FG_V_down  = 0.0;   // -1.265722E-05

    // Initial Orientation
    FG_Phi   = -2.658474E-06;
    FG_Theta =  7.401790E-03;
    FG_Psi   =  270.0 * DEG_TO_RAD;

    // Initial Angular B rates
    FG_P_body = 7.206685E-05;
    FG_Q_body = 0.000000E+00;
    FG_R_body = 9.492658E-05;

    FG_Earth_position_angle = 0.000000E+00;

    // Mass properties and geometry values
    FG_Mass = 8.547270E+01;
    FG_I_xx = 1.048000E+03;
    FG_I_yy = 3.000000E+03;
    FG_I_zz = 3.530000E+03;
    FG_I_xz = 0.000000E+00;

    // CG position w.r.t. ref. point
    FG_Dx_cg = 0.000000E+00;
    FG_Dy_cg = 0.000000E+00;
    FG_Dz_cg = 0.000000E+00;

    // Initialize the event manager
    global_events.Init();

    // Output event stats every 60 seconds
    global_events.Register( "fgEventPrintStats()", fgEventPrintStats,
			    FG_EVENT_READY, 60000 );

    // Initialize the time dependent variables
    fgTimeInit(t);
    fgTimeUpdate(f, t);

    // Initialize view parameters
    v->Init();
    v->Update(f);
    v->UpdateWorldToEye(f);

    // Initialize the orbital elements of sun, moon and mayor planets
    fgSolarSystemInit(*t);

    // Initialize the Stars subsystem
    if( fgStarsInit() ) {
	// Stars initialized ok.
    } else {
    	fgPrintf( FG_GENERAL, FG_EXIT, "Error in Stars initialization!\n" );
    }

    // Initialize the planetary subsystem
    global_events.Register( "fgPlanetsInit()", fgPlanetsInit, 
			    FG_EVENT_READY, 600000);

    // Initialize the sun's position 
    global_events.Register( "fgSunInit()", fgSunInit, 
			    FG_EVENT_READY, 30000 );

    // Intialize the moon's position
    global_events.Register( "fgMoonInit()", fgMoonInit, 
			    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();

    // Initialize Lighting interpolation tables
    l->Init();

    // update the lighting parameters (based on sun angle)
    global_events.Register( "fgLightUpdate()", fgLightUpdate,
			    FG_EVENT_READY, 30000 );

    // Initialize the weather modeling subsystem
    fgWeatherInit();

    // update the weather for our current position
    global_events.Register( "fgWeatherUpdate()", fgWeatherUpdate,
			    FG_EVENT_READY, 120000 );

    // Initialize the Cockpit subsystem
    if( fgCockpitInit( &current_aircraft )) {
	// Cockpit initialized ok.
    } else {
    	fgPrintf( FG_GENERAL, FG_EXIT, "Error in Cockpit initialization!\n" );
    }

    // Initialize the "sky"
    fgSkyInit();

    // Initialize the Scenery Management subsystem
    if ( fgSceneryInit() ) {
	// Scenery initialized ok.
    } else {
    	fgPrintf( FG_GENERAL, FG_EXIT, "Error in Scenery initialization!\n" );
    }


    if( fgTileMgrInit() ) {
	// Load the local scenery data
	fgTileMgrUpdate();
    } else {
    	fgPrintf( FG_GENERAL, FG_EXIT, 
		  "Error in Tile Manager initialization!\n" );
    }

    // I'm just sticking this here for now, it should probably move
    // eventually
        cur_elev = FG_Runway_altitude * FEET_TO_METER;
        if ( cur_elev > -9990.0 ) {
	    FG_Runway_altitude = cur_elev * METER_TO_FEET;
        }

        if ( FG_Altitude < FG_Runway_altitude ) {
	    FG_Altitude = FG_Runway_altitude + 3.758099;
        }

        fgPrintf( FG_GENERAL, FG_INFO,
	     "Updated position (after elevation adj): (%.4f, %.4f, %.2f)\n",
	     FG_Latitude * RAD_TO_DEG, FG_Longitude * RAD_TO_DEG,
	     FG_Altitude * FEET_TO_METER);
    // end of thing that I just stuck in that I should probably move
		
    // Initialize the flight model subsystem data structures base on
    // above values

    fgFlightModelInit( FG_LARCSIM, f, 1.0 / DEFAULT_MODEL_HZ );

    // Joystick support
    if (fgJoystickInit(0) ) {
	// Joystick initialized ok.
    } else {
    	fgPrintf( FG_GENERAL, FG_EXIT, "Error in Joystick initialization!\n" );
    }

    // Autopilot init added here, by Jeff Goeke-Smith
    fgAPInit(&current_aircraft);
    
    fgPrintf(FG_GENERAL, FG_INFO,"\n");

    return(1);
}


// $Log$
// 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.
//