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flightgear/Main/fg_init.cxx
curt 9d608dd593 Shuffled $FG_ROOT file layout.
1998-08-25 20:53:24 +00:00

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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 <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 <string.h>
#include <Include/fg_constants.h>
#include <Include/general.h>
#include <Aircraft/aircraft.h>
#include <Airports/simple.hxx>
#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_geodesy.h>
#include <Math/fg_random.h>
#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.h>
#include "fg_init.hxx"
#include "options.hxx"
#include "views.hxx"
extern const char *default_root;
// Set initial position and orientation
int fgInitPosition( void ) {
char id[5];
fgFLIGHT *f;
f = current_aircraft.flight;
current_options.get_airport_id(id);
if ( strlen(id) ) {
// set initial position from airport id
fgAIRPORTS airports;
fgAIRPORT a;
fgPrintf( FG_GENERAL, FG_INFO,
"Attempting to set starting position from airport code %s.\n",
id);
airports.load("apt_simple");
a = airports.search(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", id);
} else {
FG_Longitude = ( a.longitude ) * DEG_TO_RAD;
FG_Latitude = ( a.latitude ) * DEG_TO_RAD;
}
} else {
// set initial position from default or command line coordinates
FG_Longitude = current_options.get_lon() * DEG_TO_RAD;
FG_Latitude = current_options.get_lat() * DEG_TO_RAD;
}
printf("starting altitude is = %.2f\n", current_options.get_altitude());
FG_Altitude = current_options.get_altitude() * METER_TO_FEET;
FG_Runway_altitude = FG_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;
char root[256];
int i;
g = &general;
fgPrintf( FG_GENERAL, FG_INFO, "General Initialization\n" );
fgPrintf( FG_GENERAL, FG_INFO, "======= ==============\n" );
g->glVendor = (char *)glGetString ( GL_VENDOR );
g->glRenderer = (char *)glGetString ( GL_RENDERER );
g->glVersion = (char *)glGetString ( GL_VERSION );
current_options.get_fg_root(root);
if ( !strlen(root) ) {
// No root path set? Then bail ...
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", root);
// prime the frame rate counter pump
for ( i = 0; i < FG_FRAME_RATE_HISTORY; i++ ) {
g->frames[i] = 0.0;
}
return ( 1 );
}
// convert a geodetic point lon(radians), lat(radians), elev(meter) to
// a cartesian point
fgPoint3d geod_to_cart(double geod[3]) {
fgPoint3d cp;
fgPoint3d pp;
double gc_lon, gc_lat, sl_radius;
// printf("A geodetic point is (%.2f, %.2f, %.2f)\n",
// geod[0], geod[1], geod[2]);
gc_lon = geod[0];
fgGeodToGeoc(geod[1], geod[2], &sl_radius, &gc_lat);
// printf("A geocentric point is (%.2f, %.2f, %.2f)\n", gc_lon,
// gc_lat, sl_radius+geod[2]);
pp.lon = gc_lon;
pp.lat = gc_lat;
pp.radius = sl_radius + geod[2];
cp = fgPolarToCart3d(pp);
// printf("A cart point is (%.8f, %.8f, %.8f)\n", cp.x, cp.y, cp.z);
return(cp);
}
// 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 ) {
fgFLIGHT *f;
fgLIGHT *l;
fgTIME *t;
fgVIEW *v;
double geod_pos[3];
fgPoint3d abs_view_pos;
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();
// 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.flight;
// set the initial position
fgInitPosition();
// 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" );
}
// calculalate a cartesian point somewhere along the line between
// the center of the earth and our view position
geod_pos[0] = FG_Longitude;
geod_pos[1] = FG_Latitude;
// doesn't have to be the exact elevation (this is good because we
// don't know it yet :-)
geod_pos[2] = 0;
abs_view_pos = geod_to_cart(geod_pos);
// Calculate ground elevation at starting point
scenery.cur_elev =
fgTileMgrCurElev( FG_Longitude, FG_Latitude, &abs_view_pos );
FG_Runway_altitude = scenery.cur_elev * METER_TO_FEET;
// Reset our altitude if we are below ground
if ( FG_Altitude < FG_Runway_altitude + 3.758099) {
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
// The following section sets up the flight model EOM parameters
// and should really be read in from one or more files.
// 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 = current_options.get_roll() * DEG_TO_RAD;
FG_Theta = current_options.get_pitch() * DEG_TO_RAD;
FG_Psi = current_options.get_heading() * 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->UpdateViewMath(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 flight model subsystem data structures base on
// above values
fgFlightModelInit( current_options.get_flight_model(), f,
1.0 / DEFAULT_MODEL_HZ );
// I'm just sticking this here for now, it should probably move
// eventually
scenery.cur_elev = FG_Runway_altitude * FEET_TO_METER;
if ( FG_Altitude < FG_Runway_altitude + 3.758099) {
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
// 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 1.33 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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