Gamma.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D 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.
//
//    Scorched3D 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 Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <stdio.h>
#include <common/Defines.h>
#include <graph/Gamma.h>
#include <graph/OptionsDisplay.h>
#include <math.h>
#include <SDL/SDL.h>

Gamma *Gamma::instance_ = 0;

Gamma *Gamma::instance()
{
        if (!instance_)
        {
                instance_ = new Gamma;
        }

        return instance_;
}

Gamma::Gamma()
{

}

Gamma::~Gamma()
{
        reset();
}

bool Gamma::set()
{
        float gamma = 
                float(OptionsDisplay::instance()->getBrightness()) / 10.0f;

        GammaSettings tmpSettings_;
        for (int n=0; n<256; n++) 
        {
                float i = (float)n / 256.0f;
                float c = powf(i,1.0f/gamma);

                int value =  (int)(c*65535.0 + 0.5); 
                if ( value > 65535 ) { value = 65535; } 

                tmpSettings_.Red  [n] = (Uint16)value;
                tmpSettings_.Green[n] = (Uint16)value;
                tmpSettings_.Blue [n] = (Uint16)value;
        }

        if (SDL_SetGammaRamp(tmpSettings_.Red,tmpSettings_.Green,tmpSettings_.Blue) <0)
        {
                return false;
        }

        return true;
}

bool Gamma::save()
{
        if (SDL_GetGammaRamp(savedSettings_.Red,  savedSettings_.Green, savedSettings_.Blue) <0) 
                return false;
        return true;
}

void Gamma::reset()
{
        SDL_SetGammaRamp(savedSettings_.Red,  savedSettings_.Green, savedSettings_.Blue);
}

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