-/**************************************************************************
- * weather.c -- routines to model weather
- *
- * Written by Curtis Olson, started July 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
-
-#ifdef HAVE_WINDOWS_H
-# include <windows.h>
-#endif
-
-#include <GL/glut.h>
-#include <XGL/xgl.h>
-
-#include <math.h>
-#include <stdio.h>
-
-#include <Aircraft/aircraft.h>
-#include <Debug/fg_debug.h>
-#include <Math/fg_random.h>
-#include <Weather/weather.h>
-
-
-/* This is a record containing current weather info */
-struct fgWEATHER current_weather;
-
-
-/* Initialize the weather modeling subsystem */
-void fgWeatherInit( void ) {
- struct fgWEATHER *w;
-
- w = ¤t_weather;
-
- printf("Initializing weather subsystem\n");
-
- /* Configure some wind */
- /* FG_V_north_airmass = 15; */ /* ft/s =~ 10mph */
-
- // fgWeatherSetVisibility(45000.0); /* in meters */
- fgWeatherSetVisibility(32000.0); /* about 20 miles (in meters) */
-}
-
-
-/* Update the weather parameters for the current position */
-void fgWeatherUpdate( void ) {
-
- /* temporarily remove the code of this do-nothing routine */
-
-// #ifdef FG_WEATHER_UPDATE
- fgFLIGHT *f;
- struct fgWEATHER *w;
-
- f = current_aircraft.flight;
- w = ¤t_weather;
-
- /* Add some random turbulence */
- // FG_U_gust = fg_random() * 5.0 - 2.5;
- // FG_V_gust = fg_random() * 5.0 - 2.5;
- // FG_W_gust = fg_random() * 5.0 - 2.5;
-// #endif FG_WEATHER_UPDATE
-}
-
-
-/* Get the current visibility */
-float fgWeatherGetVisibility( void ) {
- struct fgWEATHER *w;
- w = ¤t_weather;
-
- return ( w->visibility );
-}
-
-
-/* Set the visibility and update fog parameters */
-void fgWeatherSetVisibility( float visibility ) {
- struct fgWEATHER *w;
- w = ¤t_weather;
-
- w->visibility = visibility; /* in meters */
- // w->fog_density = -log(0.01 / w->visibility; /* for GL_FOG_EXP */
- w->fog_density = sqrt( -log(0.01) ) / w->visibility; /* for GL_FOG_EXP2 */
- xglFogf (GL_FOG_DENSITY, w->fog_density);
- fgPrintf( FG_INPUT, FG_DEBUG,
- "Fog density = %.4f\n", w->fog_density);
-}
-
-
-/* $Log$
-/* Revision 1.18 1998/10/02 12:46:50 curt
-/* Added an "auto throttle"
-/*
- * Revision 1.17 1998/07/20 12:51:57 curt
- * Default visibility to about 20 miles.
- *
- * Revision 1.16 1998/06/12 01:00:59 curt
- * Build only static libraries.
- * Declare memmove/memset for Sloaris.
- * Added support for exponetial fog, which solves for the proper density to
- * achieve the desired visibility range.
- *
- * Revision 1.15 1998/04/25 22:06:34 curt
- * Edited cvs log messages in source files ... bad bad bad!
- *
- * Revision 1.14 1998/02/09 15:07:54 curt
- * Minor tweaks.
- *
- * Revision 1.13 1998/01/27 00:48:08 curt
- * Incorporated Paul Bleisch's <pbleisch@acm.org> new debug message
- * system and commandline/config file processing code.
- *
- * Revision 1.12 1998/01/19 19:27:22 curt
- * Merged in make system changes from Bob Kuehne <rpk@sgi.com>
- * This should simplify things tremendously.
- *
- * Revision 1.11 1998/01/19 18:40:41 curt
- * Tons of little changes to clean up the code and to remove fatal errors
- * when building with the c++ compiler.
- *
- * Revision 1.10 1997/12/30 22:22:46 curt
- * Further integration of event manager.
- *
- * Revision 1.9 1997/12/30 20:48:03 curt
- * Integrated new event manager with subsystem initializations.
- *
- * Revision 1.8 1997/12/11 04:43:58 curt
- * Fixed sun vector and lighting problems. I thing the moon is now lit
- * correctly.
- *
- * Revision 1.7 1997/12/10 22:37:56 curt
- * Prepended "fg" on the name of all global structures that didn't have it yet.
- * i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
- *
- * Revision 1.6 1997/08/27 03:30:38 curt
- * Changed naming scheme of basic shared structures.
- *
- * Revision 1.5 1997/08/22 21:34:42 curt
- * Doing a bit of reorganizing and house cleaning.
- *
- * Revision 1.4 1997/08/02 16:23:55 curt
- * Misc. tweaks.
- *
- * Revision 1.3 1997/07/31 22:52:41 curt
- * Working on redoing internal coordinate systems & scenery transformations.
- *
- * Revision 1.2 1997/07/30 16:12:44 curt
- * Moved fg_random routines from Util/ to Math/
- *
- * Revision 1.1 1997/07/19 23:03:57 curt
- * Initial revision.
- *
- */