application_surface_is_enabled

This function returns true if the application surface is being used for drawing, or false if the screen buffer is being used.

Syntax:

application_surface_is_enabled();

Returns:

Boolean

Example:

if (keyboard_check_pressed(vk_space))
{
    if application_surface_is_enabled()
    {
        application_surface_enable(false);
    }
    else
    {
        application_surface_enable(true);
    }
}

The above code checks for a key press and the toggles the application surface on or off depending on its state (like in an options menu).