69 lines
1.6 KiB
C++
69 lines
1.6 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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#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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