function scr_ease_inout(arg0, arg1)
{
    if (arg1 < -3 || arg1 > 7)
        return arg0;
    if (arg1 == -3)
        return ease_inout_bounce(arg0, 0, 1, 1);
    else if (arg1 == -2)
        return ease_inout_elastic(arg0, 0, 1, 1);
    else if (arg1 == -1)
        return ease_inout_back(arg0, 0, 1, 1);
    else if (arg1 == 1)
        return -0.5 * cos((pi * arg0) - 1);
    else if (arg1 == 0)
        return arg0;
    arg0 *= 2;
    if (arg0 < 1)
    {
        return 0.5 * scr_ease_in(arg0, arg1);
    }
    else
    {
        arg0--;
        return 0.5 * (scr_ease_out(arg0, arg1) + 1);
    }
}