weather.h

/*--License:
        Lilith 3D Engine
        Copyright Lee Thomason (Grinning Lizard Software) 2002-2004
        www.grinninglizard.com/lilith

        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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

        The full text of the license can be found in license.txt
*/

#ifndef L3_WEATHER_INCLUDED
#define L3_WEATHER_INCLUDED

#include "../grinliz/gldebug.h"
#include "../grinliz/glutil.h"
#include "../grinliz/glcolor.h"

namespace lilith3d
{

const float L3_WEATHER_SPEED = 0.2f;

class Weather
{
  public:
        Weather();

        void SmartEnableFog() const;
        float Fog() const               { return param[FOG]; }
        float Rain() const              { return param[RAIN]; }
        float Haze() const              { return param[HAZE]; }

        void FogColor( grinliz::Color3F* color ) const;
        float FogAtInfinity() const;

        void SetFog( float v )  { param[FOG] = grinliz::Clamp( v, 0.0f, 1.0f ); }
        void SetRain( float v ) { param[RAIN] = grinliz::Clamp( v, 0.0f, 1.0f ); }
        
        void DoTick( const Weather& target );

        #ifdef DEBUG
        void Dump();
        #endif

  private:
        enum
        {
                FOG,            // the amount of fog. 0 is a clear day, 1 is whiteout.
//              COVERDARK,      // darkness caused by high cloud cover. 0 is no high cloud cover, 1 is very dark.
                RAIN,           // the amount of rain.
                HAZE,           // the amount of ground haze.
                PARAM_COUNT
        };

        void FogParams( float fog, float* start, float* end ) const;

        float param[PARAM_COUNT];
};
};

#endif

---