173 lines
5 KiB
C
173 lines
5 KiB
C
/**************************************************************************
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* weather.c -- routines to model weather
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*
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* Written by Curtis Olson, started July 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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#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 <XGL/xgl.h>
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#include <math.h>
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#include <stdio.h>
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#include <Aircraft/aircraft.h>
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#include <Debug/fg_debug.h>
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#include <Math/fg_random.h>
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#include <Weather/weather.h>
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/* This is a record containing current weather info */
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struct fgWEATHER current_weather;
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/* Initialize the weather modeling subsystem */
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void fgWeatherInit( void ) {
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struct fgWEATHER *w;
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w = ¤t_weather;
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printf("Initializing weather subsystem\n");
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/* Configure some wind */
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/* FG_V_north_airmass = 15; */ /* ft/s =~ 10mph */
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// fgWeatherSetVisibility(45000.0); /* in meters */
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fgWeatherSetVisibility(32000.0); /* about 20 miles (in meters) */
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}
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/* Update the weather parameters for the current position */
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void fgWeatherUpdate( void ) {
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/* temporarily remove the code of this do-nothing routine */
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// #ifdef FG_WEATHER_UPDATE
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fgFLIGHT *f;
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struct fgWEATHER *w;
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f = current_aircraft.flight;
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w = ¤t_weather;
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/* Add some random turbulence */
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// FG_U_gust = fg_random() * 5.0 - 2.5;
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// FG_V_gust = fg_random() * 5.0 - 2.5;
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// FG_W_gust = fg_random() * 5.0 - 2.5;
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// #endif FG_WEATHER_UPDATE
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}
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/* Get the current visibility */
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float fgWeatherGetVisibility( void ) {
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struct fgWEATHER *w;
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w = ¤t_weather;
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return ( w->visibility );
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}
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/* Set the visibility and update fog parameters */
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void fgWeatherSetVisibility( float visibility ) {
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struct fgWEATHER *w;
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w = ¤t_weather;
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w->visibility = visibility; /* in meters */
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// w->fog_density = -log(0.01 / w->visibility; /* for GL_FOG_EXP */
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w->fog_density = sqrt( -log(0.01) ) / w->visibility; /* for GL_FOG_EXP2 */
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xglFogf (GL_FOG_DENSITY, w->fog_density);
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fgPrintf( FG_INPUT, FG_DEBUG,
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"Fog density = %.4f\n", w->fog_density);
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}
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/* $Log$
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/* Revision 1.18 1998/10/02 12:46:50 curt
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/* Added an "auto throttle"
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/*
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* Revision 1.17 1998/07/20 12:51:57 curt
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* Default visibility to about 20 miles.
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*
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* Revision 1.16 1998/06/12 01:00:59 curt
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* Build only static libraries.
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* Declare memmove/memset for Sloaris.
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* Added support for exponetial fog, which solves for the proper density to
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* achieve the desired visibility range.
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*
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* Revision 1.15 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 1.14 1998/02/09 15:07:54 curt
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* Minor tweaks.
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*
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* Revision 1.13 1998/01/27 00:48:08 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 1.12 1998/01/19 19:27:22 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 1.11 1998/01/19 18:40:41 curt
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* Tons of little changes to clean up the code and to remove fatal errors
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* when building with the c++ compiler.
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*
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* Revision 1.10 1997/12/30 22:22:46 curt
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* Further integration of event manager.
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*
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* Revision 1.9 1997/12/30 20:48:03 curt
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* Integrated new event manager with subsystem initializations.
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*
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* Revision 1.8 1997/12/11 04:43:58 curt
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* Fixed sun vector and lighting problems. I thing the moon is now lit
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* correctly.
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*
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* Revision 1.7 1997/12/10 22:37:56 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 1.6 1997/08/27 03:30:38 curt
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* Changed naming scheme of basic shared structures.
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*
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* Revision 1.5 1997/08/22 21:34:42 curt
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* Doing a bit of reorganizing and house cleaning.
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*
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* Revision 1.4 1997/08/02 16:23:55 curt
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* Misc. tweaks.
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*
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* Revision 1.3 1997/07/31 22:52:41 curt
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* Working on redoing internal coordinate systems & scenery transformations.
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*
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* Revision 1.2 1997/07/30 16:12:44 curt
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* Moved fg_random routines from Util/ to Math/
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*
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* Revision 1.1 1997/07/19 23:03:57 curt
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* Initial revision.
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*
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*/
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