1 /**************************************************************************
2 * fg_time.h -- data structures and routines for managing time related stuff.
4 * Written by Curtis Olson, started August 1997.
6 * Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
8 * This program is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU General Public License as
10 * published by the Free Software Foundation; either version 2 of the
11 * License, or (at your option) any later version.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 * (Log is kept at end of this file)
24 **************************************************************************/
39 #include "../Flight/flight.h"
42 /* Define a structure containing global time parameters */
44 /* the date/time in various forms */
45 time_t cur_time; /* Unix "calendar" time in seconds */
46 struct tm *gmt; /* Break down of GMT time */
48 double jd; /* Julian date */
49 double mjd; /* modified Julian date */
51 double gst; /* side real time at prime meridian */
52 double lst; /* local side real time */
54 double gst_diff; /* the difference between the precise
55 sidereal time algorithm result and the
56 course result. course + diff has good
57 accuracy for the short term */
60 extern struct fgTIME cur_time_params;
63 /* Lighting is time dependent so it shows up here */
64 /* Define a structure containing the global lighting parameters */
66 /* position of the sun in various forms */
67 double sun_lon, sun_gc_lat; /* in geocentric coordinates */
68 struct fgCartesianPoint fg_sunpos; /* in cartesian coordiantes */
69 GLfloat sun_vec[4]; /* (in view coordinates) */
70 GLfloat sun_vec_inv[4]; /* inverse (in view coordinates) */
71 double sun_angle; /* the angle between the sun and the
74 /* Derived lighting values */
75 GLfloat scene_ambient[3]; /* ambient component */
76 GLfloat scene_diffuse[3]; /* diffuse component */
77 GLfloat scene_fog[4]; /* fog color */
78 GLfloat scene_clear[4]; /* clear screen color */
81 extern struct fgLIGHT cur_light_params;
84 /* Initialize the time dependent variables */
85 void fgTimeInit(struct fgTIME *t);
87 /* Update the time dependent variables */
88 void fgTimeUpdate(struct FLIGHT *f, struct fgTIME *t);
91 #endif /* FG_TIME_H */
95 /* Revision 1.8 1997/12/09 04:25:38 curt
96 /* Working on adding a global lighting params structure.
98 * Revision 1.7 1997/11/25 19:25:41 curt
99 * Changes to integrate Durk's moon/sun code updates + clean up.
101 * Revision 1.6 1997/09/20 03:34:35 curt
102 * Still trying to get those durned stars aligned properly.
104 * Revision 1.5 1997/09/16 15:50:31 curt
105 * Working on star alignment and time issues.
107 * Revision 1.4 1997/09/13 02:00:08 curt
108 * Mostly working on stars and generating sidereal time for accurate star
111 * Revision 1.3 1997/09/04 02:17:39 curt
114 * Revision 1.2 1997/08/27 03:30:36 curt
115 * Changed naming scheme of basic shared structures.
117 * Revision 1.1 1997/08/13 21:56:00 curt