113 lines
3 KiB
C++
113 lines
3 KiB
C++
// weather.hxx -- 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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#ifndef _WEATHER_HXX
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#define _WEATHER_HXX
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// holds the current weather values
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class FGWeather {
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private:
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double visibility;
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GLfloat fog_exp_density;
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GLfloat fog_exp2_density;
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public:
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FGWeather();
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~FGWeather();
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void Init();
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void Update();
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inline double get_visibility() const { return visibility; }
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inline void set_visibility( double v ) {
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// in meters
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visibility = v;
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// for GL_FOG_EXP
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fog_exp_density = -log(0.01 / visibility);
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// for GL_FOG_EXP2
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fog_exp2_density = sqrt( -log(0.01) ) / visibility;
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// Set correct opengl fog density
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xglFogf (GL_FOG_DENSITY, fog_exp2_density);
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// FG_LOG( FG_INPUT, FG_DEBUG, "Fog density = " << w->fog_density );
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}
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};
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extern FGWeather current_weather;
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#endif // _WEATHER_HXX
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// $Log$
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// Revision 1.2 1998/12/06 13:51:27 curt
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// Turned "struct fgWEATHER" into "class FGWeather".
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//
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// Revision 1.1 1998/10/17 01:34:37 curt
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// C++ ifying ...
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//
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// Revision 1.10 1998/06/12 01:01:00 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 1.9 1998/04/21 17:02:46 curt
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// Prepairing for C++ integration.
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//
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// Revision 1.8 1998/01/22 02:59:44 curt
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// Changed #ifdef FILE_H to #ifdef _FILE_H
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//
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// Revision 1.7 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 1.6 1997/12/30 22:22:47 curt
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// Further integration of event manager.
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//
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// Revision 1.5 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 1.4 1997/08/27 03:30:39 curt
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// Changed naming scheme of basic shared structures.
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//
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// Revision 1.3 1997/08/22 21:34:43 curt
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// Doing a bit of reorganizing and house cleaning.
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//
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// Revision 1.2 1997/07/23 21:52:30 curt
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// Put comments around the text after an #endif for increased portability.
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//
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// Revision 1.1 1997/07/19 23:03:58 curt
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// Initial revision.
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//
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