if (surf_screen_noloop == false)
{
    surface_set_target(surf_screen_copy)
    draw_clear_alpha(c_black, 0)
    surface_reset_target()
    surface_copy(surf_screen_copy, 0, 0, application_surface)
    surf_screen_noloop = true
}
else if (!surface_exists(surf_screen_copy))
{
    surf_screen_noloop = false
    return;
}
var w_scale = surface_get_width(application_surface) / 320
var h_scale = surface_get_height(application_surface) / 240
var w_multiplier = 320 / surface_get_width(application_surface)
var h_multiplier = 240 / surface_get_height(application_surface)
for (var i = 0; i < array_length(line_y); i++)
    draw_surface_part_ext(surf_screen_copy, (i * w_scale), 0, w_scale, (320 * h_scale), i, clamp(line_y[i], 0, 9999), w_multiplier, h_multiplier, 16777215, 1)