gl_fog.cpp

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#include "gfxlib.h"
#include "gl_globals.h"
static struct _GFXFogState
{
    bool     enabled;
    FOGMODE  curmode;
    float    density;
    float    nnear;
    float    ffar;
    GFXColor c;
    int index;
    _GFXFogState() : c( 0, 0, 0, 0 )
    {
        index   = 0;
        nnear   = 0;
        ffar    = 1;
        density = 1;
        curmode = FOG_EXP;
    }
}
GFXFogState;

void GFXFogMode( const FOGMODE fog )
{
    if (GFXFogState.curmode != fog || !GFXFogState.enabled) {
        switch (fog)
        {
        case FOG_OFF:
            if (!GFXFogState.enabled)
                return;
            glDisable( GL_FOG );
            GFXFogState.enabled = false;
            return;
        case FOG_EXP:
            glFogi( GL_FOG_MODE, GL_EXP );
            break;
        case FOG_EXP2:
            glFogi( GL_FOG_MODE, GL_EXP2 );
            break;
        case FOG_LINEAR:
            glFogi( GL_FOG_MODE, GL_LINEAR );
            break;
        }
    }
    if (!GFXFogState.enabled) glEnable( GL_FOG );
    GFXFogState.curmode = fog;
    GFXFogState.enabled = true;
    //glHint (GL_FOG_HINT,GL_NICEST );
}

void GFXFogDensity( const float fogdensity )
{
    if (fogdensity != GFXFogState.density) {
        glFogf( GL_FOG_DENSITY, fogdensity );
        GFXFogState.density = fogdensity;
    }
}

void GFXFogLimits( const float fognear, const float fogfar )
{
    if (GFXFogState.nnear != fognear || GFXFogState.ffar != fogfar) {
        GFXFogState.nnear = fognear;
        GFXFogState.ffar  = fogfar;
        glFogf( GL_FOG_START, fognear );
        glFogf( GL_FOG_END, fogfar );
    }
}

void GFXFogColor( GFXColor c )
{
    if (c.r != GFXFogState.c.r || c.g != GFXFogState.c.g || c.b != GFXFogState.c.b || c.a != GFXFogState.c.a) {
        glFogfv( GL_FOG_COLOR, &c.r );
        GFXFogState.c = c;
    }
}

void GFXFogIndex( const int index )
{
    if (GFXFogState.index != index) {
        glFogi( GL_FOG_INDEX, index );
        GFXFogState.index = index;
    }
}