145 lines
4.7 KiB
C
145 lines
4.7 KiB
C
/**************************************************************************
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* fg_time.h -- 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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**************************************************************************/
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#ifndef FG_TIME_H
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#define FG_TIME_H
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#ifdef WIN32
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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 <time.h>
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#include <Include/types.h>
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#include <Flight/flight.h>
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/* Define a structure containing global time parameters */
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struct fgTIME {
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/* the date/time in various forms */
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time_t cur_time; /* Unix "calendar" time in seconds */
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struct tm *gmt; /* Break down of GMT time */
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double jd; /* Julian date */
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double mjd; /* modified Julian date */
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double gst; /* side real time at prime meridian */
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double lst; /* local side real time */
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double gst_diff; /* the difference between the precise
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sidereal time algorithm result and the
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course result. course + diff has good
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accuracy for the short term */
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long int warp; /* An offset in seconds from the true time.
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Allows us to adjust the effective time of day. */
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long int warp_delta; /* How much to change the value of warp each
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iteration. Allows us to make time
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progress faster than normal. */
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};
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extern struct fgTIME cur_time_params;
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/* Lighting is time dependent so it shows up here */
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/* Define a structure containing the global lighting parameters */
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struct fgLIGHT {
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/* position of the sun in various forms */
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double sun_lon, sun_gc_lat; /* in geocentric coordinates */
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struct fgCartesianPoint fg_sunpos; /* in cartesian coordiantes */
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GLfloat sun_vec[4]; /* (in view coordinates) */
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GLfloat sun_vec_inv[4]; /* inverse (in view coordinates) */
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double sun_angle; /* the angle between the sun and the
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local horizontal */
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/* Derived lighting values */
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GLfloat scene_ambient[3]; /* ambient component */
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GLfloat scene_diffuse[3]; /* diffuse component */
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GLfloat fog_color[4]; /* fog color */
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GLfloat sky_color[4]; /* clear screen color */
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};
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extern struct fgLIGHT cur_light_params;
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/* Initialize the time dependent variables */
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void fgTimeInit(struct fgTIME *t);
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/* Update the time dependent variables */
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void fgTimeUpdate(struct fgFLIGHT *f, struct fgTIME *t);
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#endif /* FG_TIME_H */
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/* $Log$
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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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*/
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