#include <stdlib.h>
#include <time.h>
-#include "fg_time.h"
-#include "../constants.h"
-#include "../Flight/flight.h"
+#ifdef USE_FTIME
+# include <sys/timeb.h> /* for ftime() and struct timeb */
+#else
+# include <unistd.h> /* for gettimeofday() */
+# include <sys/time.h> /* for get/setitimer, gettimeofday, struct timeval */
+#endif /* USE_FTIME */
+
+#include <Time/fg_time.h>
+#include <Include/fg_constants.h>
+#include <Flight/flight.h>
#define DEGHR(x) ((x)/15.)
#define RADHR(x) DEGHR(x*RAD_TO_DEG)
+#include <Main/fg_debug.h>
struct fgTIME cur_time_params;
+struct fgLIGHT cur_light_params;
+
+
+/* Initialize the time dependent variables */
+
+void fgTimeInit(struct fgTIME *t) {
+ fgPrintf( FG_EVENT, FG_INFO, "Initializing Time\n");
+
+ t->gst_diff = -9999.0;
+ t->warp = (0) * 3600;
+ t->warp_delta = 0;
+}
/* given a date in months, mn, days, dy, years, yr, return the
x /= 3600.0;
gst = (1.0/SIDRATE)*hr + x;
+ fgPrintf( FG_EVENT, FG_DEBUG, " gst => %.4f\n", gst);
+
return(gst);
}
* Provided courtesy of ecdowney@noao.edu (Elwood Downey)
*/
-double sidereal (double mjd, double lng) {
+double sidereal_precise (double mjd, double lng) {
double gst;
double lst;
- printf ("Current Lst on JD %13.5f at %8.4f degrees West: ",
- mjd + MJD0, lng);
+ /* printf ("Current Lst on JD %13.5f at %8.4f degrees West: ",
+ mjd + MJD0, lng); */
/* convert to required internal units */
lng *= DEG_TO_RAD;
gst = utc_gst (mjd);
lst = gst - RADHR (lng);
lst -= 24.0*floor(lst/24.0);
- printf ("%7.4f\n", lst);
+ /* printf ("%7.4f\n", lst); */
/* that's all */
return (lst);
}
+/* return a courser but cheaper estimate of sidereal time */
+double sidereal_course(struct tm *gmt, time_t now, double lng) {
+ time_t start, start_gmt;
+ struct tm mt;
+ long int offset;
+ double diff, part, days, hours, lst;
+
+#ifdef USE_FTIME
+ struct timeb current;
+#endif /* USE_FTIME */
+
+#ifdef WIN32
+ int daylight;
+ long int timezone;
+#endif /* WIN32 */
+
+ /*
+ printf(" COURSE: GMT = %d/%d/%2d %d:%02d:%02d\n",
+ gmt->tm_mon, gmt->tm_mday, gmt->tm_year,
+ gmt->tm_hour, gmt->tm_min, gmt->tm_sec);
+ */
+
+ mt.tm_mon = 2;
+ mt.tm_mday = 21;
+ mt.tm_year = gmt->tm_year;
+ mt.tm_hour = 12;
+ mt.tm_min = 0;
+ mt.tm_sec = 0;
+ mt.tm_isdst = -1; /* let the system determine the proper time zone */
+
+ start = mktime(&mt);
+
+ /* printf("start1 = %ld\n", start);
+ fgPrintf( FG_EVENT, FG_DEBUG, "start2 = %s", ctime(&start));
+ fgPrintf( FG_EVENT, FG_DEBUG, "start3 = %ld\n", start); */
+
+ daylight = mt.tm_isdst;
+
+#ifdef USE_FTIME
+ ftime(¤t);
+ timezone = current.timezone * 60;
+#endif /* USE_FTIME */
+
+ if ( daylight > 0 ) {
+ daylight = 1;
+ } else if ( daylight < 0 ) {
+ fgPrintf( FG_EVENT, FG_WARN, "OOOPS, big time problem in fg_time.c, no daylight savings info.\n");
+ }
+
+ offset = -(timezone / 3600 - daylight);
+
+ /* printf(" Raw time zone offset = %ld\n", timezone); */
+ /* printf(" Daylight Savings = %d\n", daylight); */
+
+ /* printf(" Local hours from GMT = %ld\n", offset); */
+
+ start_gmt = start - timezone + (daylight * 3600);
+
+ /* printf(" March 21 noon (CST) = %ld\n", start); */
+ /* printf(" March 21 noon (GMT) = %ld\n", start_gmt); */
+
+ diff = (now - start_gmt) / (3600.0 * 24.0);
+
+ /* printf(" Time since 3/21/%2d GMT = %.2f\n", gmt->tm_year, diff); */
+
+ part = fmod(diff, 1.0);
+ days = diff - part;
+ hours = gmt->tm_hour + gmt->tm_min/60.0 + gmt->tm_sec/3600.0;
+
+ lst = (days - lng)/15.0 + hours - 12;
+
+ while ( lst < 0.0 ) {
+ lst += 24.0;
+ }
+
+ /* printf(" days = %.1f hours = %.2f lon = %.2f lst = %.2f\n",
+ days, hours, lng, lst); */
+
+ return(lst);
+}
+
+
/* Update the time dependent variables */
-void fgTimeUpdate(struct FLIGHT *f, struct fgTIME *t) {
+void fgTimeUpdate(struct fgFLIGHT *f, struct fgTIME *t) {
+ double gst_precise, gst_course;
+
+ fgPrintf( FG_EVENT, FG_BULK, "Updating time\n");
+
/* get current Unix calendar time (in seconds) */
- t->cur_time = time(NULL);
- printf("Current Unix calendar time = %ld\n", t->cur_time);
+ t->warp += t->warp_delta;
+ t->cur_time = time(NULL) + t->warp;
+ fgPrintf( FG_EVENT, FG_BULK,
+ " Current Unix calendar time = %ld warp = %ld delta = %ld\n",
+ t->cur_time, t->warp, t->warp_delta);
/* get GMT break down for current time */
t->gmt = gmtime(&t->cur_time);
- printf("Current GMT = %d/%d/%2d %d:%02d:%02d\n",
- t->gmt->tm_mon+1, t->gmt->tm_mday, t->gmt->tm_year,
- t->gmt->tm_hour, t->gmt->tm_min, t->gmt->tm_sec);
+ fgPrintf( FG_EVENT, FG_BULK,
+ " Current GMT = %d/%d/%2d %d:%02d:%02d\n",
+ t->gmt->tm_mon+1, t->gmt->tm_mday, t->gmt->tm_year,
+ t->gmt->tm_hour, t->gmt->tm_min, t->gmt->tm_sec);
/* calculate modified Julian date */
t->mjd = cal_mjd ((int)(t->gmt->tm_mon+1), (double)t->gmt->tm_mday,
/* convert "back" to Julian date + partial day (as a fraction of one) */
t->jd = t->mjd + MJD0;
- printf("Current Julian Date = %.5f\n", t->jd);
+ fgPrintf( FG_EVENT, FG_BULK, " Current Julian Date = %.5f\n", t->jd);
+
+ /* printf(" Current Longitude = %.3f\n", FG_Longitude * RAD_TO_DEG); */
/* Calculate local side real time */
- t->lst = sidereal(t->mjd, -(FG_Longitude * RAD_TO_DEG));
- printf("Current Sidereal Time = %.3f\n", t->lst);
+ if ( t->gst_diff < -100.0 ) {
+ /* first time through do the expensive calculation & cheap
+ calculation to get the difference. */
+ fgPrintf( FG_EVENT, FG_INFO, " First time, doing precise gst\n");
+ t->gst = gst_precise = sidereal_precise(t->mjd, 0.00);
+ gst_course = sidereal_course(t->gmt, t->cur_time, 0.00);
+ t->gst_diff = gst_precise - gst_course;
+
+ t->lst =
+ sidereal_course(t->gmt, t->cur_time, -(FG_Longitude * RAD_TO_DEG))
+ + t->gst_diff;
+ } else {
+ /* course + difference should drift off very slowly */
+ t->gst =
+ sidereal_course(t->gmt, t->cur_time, 0.00) + t->gst_diff;
+ t->lst =
+ sidereal_course(t->gmt, t->cur_time, -(FG_Longitude * RAD_TO_DEG))
+ + t->gst_diff;
+ }
+ /* printf(" Current lon=0.00 Sidereal Time = %.3f\n", t->gst); */
+ /* printf(" Current LOCAL Sidereal Time = %.3f (%.3f) (diff = %.3f)\n",
+ t->lst, sidereal_precise(t->mjd, -(FG_Longitude * RAD_TO_DEG)),
+ t->gst_diff); */
}
/* $Log$
-/* Revision 1.3 1997/09/13 02:00:08 curt
-/* Mostly working on stars and generating sidereal time for accurate star
-/* placement.
+/* Revision 1.31 1998/01/27 00:48:06 curt
+/* Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
+/* system and commandline/config file processing code.
/*
+ * Revision 1.30 1998/01/21 21:11:35 curt
+ * Misc. tweaks.
+ *
+ * Revision 1.29 1998/01/19 19:27:20 curt
+ * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
+ * This should simplify things tremendously.
+ *
+ * Revision 1.28 1998/01/19 18:35:49 curt
+ * Minor tweaks and fixes for cygwin32.
+ *
+ * Revision 1.27 1998/01/13 00:23:13 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 1.26 1998/01/05 18:44:36 curt
+ * Add an option to advance/decrease time from keyboard.
+ *
+ * Revision 1.25 1997/12/31 17:46:50 curt
+ * Tweaked fg_time.c to be able to use ftime() instead of gettimeofday()
+ *
+ * Revision 1.24 1997/12/30 22:22:42 curt
+ * Further integration of event manager.
+ *
+ * Revision 1.23 1997/12/30 20:47:58 curt
+ * Integrated new event manager with subsystem initializations.
+ *
+ * Revision 1.22 1997/12/30 01:38:47 curt
+ * Switched back to per vertex normals and smooth shading for terrain.
+ *
+ * Revision 1.21 1997/12/23 04:58:39 curt
+ * Tweaked the sky coloring a bit to build in structures to allow finer rgb
+ * control.
+ *
+ * Revision 1.20 1997/12/15 23:55:06 curt
+ * Add xgl wrappers for debugging.
+ * Generate terrain normals on the fly.
+ *
+ * Revision 1.19 1997/12/15 20:59:10 curt
+ * Misc. tweaks.
+ *
+ * Revision 1.18 1997/12/12 21:41:31 curt
+ * More light/material property tweaking ... still a ways off.
+ *
+ * Revision 1.17 1997/12/12 19:53:04 curt
+ * Working on lightling and material properties.
+ *
+ * Revision 1.16 1997/12/11 04:43:57 curt
+ * Fixed sun vector and lighting problems. I thing the moon is now lit
+ * correctly.
+ *
+ * Revision 1.15 1997/12/10 22:37:54 curt
+ * Prepended "fg" on the name of all global structures that didn't have it yet.
+ * i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
+ *
+ * Revision 1.14 1997/12/10 01:19:52 curt
+ * Tweaks for verion 0.15 release.
+ *
+ * Revision 1.13 1997/12/09 05:11:56 curt
+ * Working on tweaking lighting.
+ *
+ * Revision 1.12 1997/12/09 04:25:37 curt
+ * Working on adding a global lighting params structure.
+ *
+ * Revision 1.11 1997/11/25 19:25:40 curt
+ * Changes to integrate Durk's moon/sun code updates + clean up.
+ *
+ * Revision 1.10 1997/11/15 18:16:42 curt
+ * minor tweaks.
+ *
+ * Revision 1.9 1997/11/14 00:26:50 curt
+ * Transform scenery coordinates earlier in pipeline when scenery is being
+ * created, not when it is being loaded. Precalculate normals for each node
+ * as average of the normals of each containing polygon so Garoude shading is
+ * now supportable.
+ *
+ * Revision 1.8 1997/10/25 03:30:08 curt
+ * Misc. tweaks.
+ *
+ * Revision 1.7 1997/09/23 00:29:50 curt
+ * Tweaks to get things to compile with gcc-win32.
+ *
+ * Revision 1.6 1997/09/20 03:34:34 curt
+ * Still trying to get those durned stars aligned properly.
+ *
+ * Revision 1.5 1997/09/16 22:14:52 curt
+ * Tweaked time of day lighting equations. Don't draw stars during the day.
+ *
+ * Revision 1.4 1997/09/16 15:50:31 curt
+ * Working on star alignment and time issues.
+ *
+ * Revision 1.3 1997/09/13 02:00:08 curt
+ * Mostly working on stars and generating sidereal time for accurate star
+ * placement.
+ *
* Revision 1.2 1997/08/27 03:30:35 curt
* Changed naming scheme of basic shared structures.
*
projects / flightgear.git / blobdiff