Irrlicht Engine

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        SIrrlichtCreationParameters         irrparams;
        irrparams.DriverType =              FDriverType;
        irrparams.Bits =                    32;
        irrparams.Fullscreen =              true;
        irrparams.Stencilbuffer =           FShadows;
        irrparams.Vsync =                   FVSync;
        irrparams.AntiAlias =               (FAntiAlias)? 8 : 0;
        irrparams.ZBufferBits =             8;
        irrparams.LoggingLevel =            ELL_INFORMATION;

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        //! Specifies if the device should use fullscreen anti aliasing
        /** Makes sharp/pixelated edges softer, but requires more
        performance. Also, 2D elements might look blurred with this
        switched on. The resulting rendering quality also depends on
        the hardware and driver you are using, your program might look
        different on different hardware with this. So if you are
        writing a game/application with AntiAlias switched on, it would
        be a good idea to make it possible to switch this option off
        again by the user.
        The value is the maximal antialiasing factor requested for
        the device. The cretion method will automatically try smaller
        values if no window can be created with the given value.
        Value one is usually the same as 0 (disabled), but might be a
        special value on some platforms. On D3D devices it maps to
        NONMASKABLE.
        Default value: 0 - disabled */
        u8 AntiAlias;

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        s32 rv=0;
        // Try to get an acceptable pixel format
        do
        {
            int pixelFormat=0;
            UINT numFormats=0;
            const BOOL valid = wglChoosePixelFormat_ARB(HDc,iAttributes,fAttributes,1,&pixelFormat,&numFormats);
 
            if (valid && numFormats)
                rv = pixelFormat;
            else
                iAttributes[21] -= 1;
        }
        while(rv==0 && iAttributes[21]>1);
        if (rv)
        {
            PixelFormat=rv;
            AntiAlias=iAttributes[21];
        }