fog.h

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/* ***********************************************************************************
        Writer:         Sebastien Bloc
        Copyright:      2003-2004
        eMail:          sebastien.bloc@free.fr
        URL:            http://mignonsoft.free.fr

        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.
        http://www.gnu.org/copyleft/gpl.html
*********************************************************************************** */

#ifndef INCLUDE_3D_FOG_H
#define INCLUDE_3D_FOG_H

typedef enum 
{
        fogLinear = GL_LINEAR,
        fogExponential = GL_EXP,
        fogExponential2 = GL_EXP2
} FogMode; 
class Fog
{
public:
        BOOL  isEnable;
        float start;
        float end;
        float density;
        FogMode mode;
        Color color;

public:
        Fog()
        {
                isEnable=FALSE;
                start=0;
                end=0;
                density=0;
                mode=fogLinear;
                color.Set(0,0,0,1.0);
        }

        void Enable(BOOL set=-1)
        {
                if (set!=-1) isEnable = set;
                if (isEnable) glEnable(GL_FOG);
                else glDisable(GL_FOG);
        }

        void Use()
        {
                Enable();
                glFogfv(GL_FOG_COLOR,color);
                glFogf(GL_FOG_START,start);
                glFogf(GL_FOG_END,end); 
                glFogf(GL_FOG_DENSITY,density); 
                glFogi(GL_FOG_MODE,(int)mode);
        }

        void GetStringMode (MyString &result)
        {
                switch (mode)
                {
                case fogLinear: result="Linear"; break;
                case fogExponential: result="Exponential"; break;
                case fogExponential2: result="Exponential²"; break;
                default: result="Error";
                }
        }

        int GetIndexMode()
        {
                switch (mode)
                {
                case fogLinear: return 0;
                case fogExponential: return 1;
                case fogExponential2: return 2;
                default: return -1;
                }
        }

        void SetIndexMode(int index)
        {
                FogMode listMode[]={fogLinear,fogExponential,fogExponential2};
                mode = listMode[index];
        }
};

#endif

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