183 lines
5.3 KiB
C++
183 lines
5.3 KiB
C++
// weather.cxx -- 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@me.umn.edu
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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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#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 <Aircraft/aircraft.hxx>
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#include <Debug/logstream.hxx>
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#include <Math/fg_random.h>
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#include <Weather/weather.hxx>
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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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FG_LOG( FG_GENERAL, FG_INFO, "Initializing weather subsystem");
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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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FGState *f;
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struct fgWEATHER *w;
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f = current_aircraft.fdm_state;
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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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FG_LOG( FG_INPUT, FG_DEBUG, "Fog density = " << w->fog_density );
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}
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// $Log$
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// Revision 1.4 1998/12/05 15:54:31 curt
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// Renamed class fgFLIGHT to class FGState as per request by JSB.
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//
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// Revision 1.3 1998/11/23 21:49:11 curt
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// Borland portability tweaks.
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//
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// Revision 1.2 1998/11/06 21:18:29 curt
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// Converted to new logstream debugging facility. This allows release
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// builds with no messages at all (and no performance impact) by using
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// the -DFG_NDEBUG flag.
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//
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// Revision 1.1 1998/10/17 01:34:36 curt
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// C++ ifying ...
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//
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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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