function scr_parallax_background(arg0, arg1 = 0, arg2 = 0, arg3, arg4, arg5 = 0, arg6 = -4, arg7 = -4)
{
    if (!instance_exists(obj_parallax_background))
        instance_create_depth(0, 0, 0, obj_parallax_background);
    var _lay = -4;
    with (obj_parallax_background)
    {
        var _layer = layer_create(arg3);
        var _back = layer_background_create(_layer, arg0);
        _lay = 
        {
            layerid: _layer,
            bgid: _back,
            xpara: arg4,
            ypara: arg5,
            xoffset: 0,
            yoffset: 0,
            yorig: arg2
        };
        array_push(layers, _lay);
        layer_background_speed(_back, 0);
        layer_background_index(_back, arg1);
        layer_background_htiled(_back, true);
        layer_background_xscale(_back, 2);
        layer_background_yscale(_back, 2);
        if (arg6 != -4)
            layer_script_begin(_layer, arg6);
        if (arg7 != -4)
            layer_script_end(_layer, arg7);
        layer_y(_layer, arg2);
    }
    return _lay;
}

function scr_parallax_background_distance(arg0, arg1 = 0, arg2 = 0, arg3 = 0, arg4 = 1, arg5 = 0, arg6 = infinity, arg7 = -4, arg8 = -4, arg9 = 0)
{
    if (!instance_exists(obj_parallax_background))
        instance_create_depth(0, 0, 0, obj_parallax_background);
    var _lay = -4;
    with (obj_parallax_background)
    {
        var _layer = layer_create(arg5);
        var _back = layer_background_create(_layer, arg0);
        var d = 0;
        if (arg6 != infinity)
        {
            d = arg6 / global.parallax_focal_length;
            d = d + 1;
            d = 1 / (d * d);
        }
        arg2 = (arg2 * ((480 - (sprite_get_height(arg0) * 2)) + (d * arg4 * (room_height - 40)))) + (arg9 * (d * arg4));
        _lay = 
        {
            layerid: _layer,
            bgid: _back,
            xpara: 1 - d,
            ypara: 1 - (d * arg4),
            xoffset: 0,
            yoffset: arg3,
            yorig: arg2
        };
        array_push(layers, _lay);
        layer_background_index(_back, arg1);
        layer_background_htiled(_back, true);
        layer_background_xscale(_back, 2);
        layer_background_yscale(_back, 2);
        layer_background_speed(_back, 0);
        if (arg7 != -4)
            layer_script_begin(_layer, arg7);
        if (arg8 != -4)
            layer_script_end(_layer, arg8);
        layer_y(_layer, arg3 + arg2);
    }
    return _lay;
}

function scr_parallax_background_distance_vtile(arg0, arg1 = 0, arg2 = 0, arg3 = 0, arg4 = 1, arg5 = 0, arg6 = infinity, arg7 = -4, arg8 = -4)
{
    if (!instance_exists(obj_parallax_background))
        instance_create_depth(0, 0, 0, obj_parallax_background);
    var _lay = -4;
    with (obj_parallax_background)
    {
        var _layer = layer_create(arg5);
        var _back = layer_background_create(_layer, arg0);
        var d = 0;
        if (arg6 != infinity)
        {
            d = arg6 / global.parallax_focal_length;
            d = d + 1;
            d = 1 / (d * d);
        }
        arg2 *= ((480 - (sprite_get_height(arg0) * 2)) + (d * arg4 * (room_height - 40)));
        _lay = 
        {
            layerid: _layer,
            bgid: _back,
            xpara: 1 - d,
            ypara: 1 - (d * arg4),
            xoffset: 0,
            yoffset: arg3,
            yorig: arg2
        };
        array_push(layers, _lay);
        layer_background_index(_back, arg1);
        layer_background_htiled(_back, true);
        layer_background_vtiled(_back, true);
        layer_background_xscale(_back, 2);
        layer_background_yscale(_back, 2);
        layer_background_speed(_back, 0);
        if (arg7 != -4)
            layer_script_begin(_layer, arg7);
        if (arg8 != -4)
            layer_script_end(_layer, arg8);
        layer_y(_layer, arg3 + arg2);
    }
    return _lay;
}