231 lines
6.9 KiB
C++
231 lines
6.9 KiB
C++
//
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// fg_time.hxx -- data structures and routines for managing time related stuff.
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//
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// Written by Curtis Olson, started August 1997.
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//
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// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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//
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// $Id$
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// (Log is kept at end of this file)
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#ifndef _FG_TIME_HXX
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#define _FG_TIME_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#include <GL/glut.h>
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#include "Include/compiler.h"
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#ifdef FG_HAVE_STD_INCLUDES
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# include <ctime>
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#else
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# include <time.h>
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#endif
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#include <FDM/flight.hxx>
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// Define a structure containing global time parameters
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typedef struct {
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// the date/time in various forms
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// Unix "calendar" time in seconds
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time_t cur_time;
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// Break down of GMT time
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struct tm *gmt;
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// Julian date
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double jd;
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// modified Julian date
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double mjd;
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// side real time at prime meridian
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double gst;
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// local side real time
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double lst;
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// the difference between the precise sidereal time algorithm
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// result and the course result.
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// course + diff has good accuracy for the short term
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double gst_diff;
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// An offset in seconds from the true time. Allows us to adjust
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// the effective time of day.
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long int warp;
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// How much to change the value of warp each iteration. Allows us
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// to make time progress faster than normal.
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long int warp_delta;
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// Paused (0 = no, 1 = yes)
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int pause;
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} fgTIME;
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extern fgTIME cur_time_params;
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// Update time variables such as gmt, julian date, and sidereal time
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void fgTimeInit(fgTIME *t);
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// Update the time dependent variables
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void fgTimeUpdate(FGInterface *f, fgTIME *t);
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#endif // _FG_TIME_HXX
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// $Log$
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// Revision 1.14 1999/02/05 21:29:19 curt
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// Modifications to incorporate Jon S. Berndts flight model code.
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//
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// Revision 1.13 1999/02/01 21:33:39 curt
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// Renamed FlightGear/Simulator/Flight to FlightGear/Simulator/FDM since
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// Jon accepted my offer to do this and thought it was a good idea.
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//
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// Revision 1.12 1999/01/07 20:25:35 curt
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// Portability changes and updates from Bernie Bright.
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//
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// Revision 1.11 1998/12/05 15:54:29 curt
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// Renamed class fgFLIGHT to class FGState as per request by JSB.
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//
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// Revision 1.10 1998/12/05 14:21:31 curt
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// Moved struct fg_timestamp to class fgTIMESTAMP and moved it's definition
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// to it's own file, timestamp.hxx.
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//
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// Revision 1.9 1998/12/04 01:32:50 curt
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// Converted "struct fg_timestamp" to "class fgTIMESTAMP" and added some
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// convenience inline operators.
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//
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// Revision 1.8 1998/10/16 23:28:00 curt
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// C++-ifying.
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//
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// Revision 1.7 1998/10/16 00:56:09 curt
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// Converted to Point3D class.
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//
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// Revision 1.6 1998/07/27 18:42:22 curt
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// Added a pause option.
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//
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// Revision 1.5 1998/05/22 21:14:54 curt
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// Rewrote event.cxx in C++ as a class using STL for the internal event list
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// and run queue this removes the arbitrary list sizes and makes things much
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// more dynamic. Because this is C++-classified we can now have multiple
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// event_tables if we'd ever want them.
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//
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// Revision 1.4 1998/04/28 01:22:17 curt
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// Type-ified fgTIME and fgVIEW.
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//
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// Revision 1.3 1998/04/25 22:06:34 curt
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// Edited cvs log messages in source files ... bad bad bad!
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//
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// Revision 1.2 1998/04/25 20:24:03 curt
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// Cleaned up initialization sequence to eliminate interdependencies
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// between sun position, lighting, and view position. This creates a
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// valid single pass initialization path.
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//
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// Revision 1.1 1998/04/24 00:52:28 curt
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// Wrapped "#include <config.h>" in "#ifdef HAVE_CONFIG_H"
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// Fog color fixes.
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// Separated out lighting calcs into their own file.
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//
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// Revision 1.20 1998/04/22 13:24:05 curt
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// C++ - ifiing the code a bit.
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// Starting to reorginize some of the lighting calcs to use a table lookup.
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//
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// Revision 1.19 1998/04/21 17:01:44 curt
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// Fixed a problems where a pointer to a function was being passed around. In
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// one place this functions arguments were defined as ( void ) while in another
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// place they were defined as ( int ). The correct answer was ( int ).
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//
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// Prepairing for C++ integration.
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//
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// Revision 1.18 1998/04/08 23:35:40 curt
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// Tweaks to Gnu automake/autoconf system.
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//
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// Revision 1.17 1998/04/03 22:12:56 curt
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// Converting to Gnu autoconf system.
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// Centralized time handling differences.
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//
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// Revision 1.16 1998/02/07 15:29:47 curt
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// Incorporated HUD changes and struct/typedef changes from Charlie Hotchkiss
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// <chotchkiss@namg.us.anritsu.com>
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//
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// Revision 1.15 1998/01/27 00:48:06 curt
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// Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
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// system and commandline/config file processing code.
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//
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// Revision 1.14 1998/01/22 02:59:43 curt
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// Changed #ifdef FILE_H to #ifdef _FILE_H
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//
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// Revision 1.13 1998/01/19 19:27:20 curt
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// Merged in make system changes from Bob Kuehne <rpk@sgi.com>
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// This should simplify things tremendously.
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//
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// Revision 1.12 1998/01/05 18:44:37 curt
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// Add an option to advance/decrease time from keyboard.
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//
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// Revision 1.11 1997/12/19 23:35:07 curt
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// Lot's of tweaking with sky rendering and lighting.
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//
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// Revision 1.10 1997/12/15 23:55:07 curt
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// Add xgl wrappers for debugging.
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// Generate terrain normals on the fly.
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//
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// Revision 1.9 1997/12/10 22:37:55 curt
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// Prepended "fg" on the name of all global structures that didn't have it yet.
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// i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
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//
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// Revision 1.8 1997/12/09 04:25:38 curt
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// Working on adding a global lighting params structure.
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//
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// Revision 1.7 1997/11/25 19:25:41 curt
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// Changes to integrate Durk's moon/sun code updates + clean up.
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//
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// Revision 1.6 1997/09/20 03:34:35 curt
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// Still trying to get those durned stars aligned properly.
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//
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// Revision 1.5 1997/09/16 15:50:31 curt
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// Working on star alignment and time issues.
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//
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// Revision 1.4 1997/09/13 02:00:08 curt
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// Mostly working on stars and generating sidereal time for accurate star
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// placement.
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//
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// Revision 1.3 1997/09/04 02:17:39 curt
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// Shufflin' stuff.
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//
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// Revision 1.2 1997/08/27 03:30:36 curt
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// Changed naming scheme of basic shared structures.
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//
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// Revision 1.1 1997/08/13 21:56:00 curt
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// Initial revision.
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//
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