view_get_surface_id

This function can be used to retrieve the unique ID value for the surface assigned to the given view port (will return -1 if no surface has been assigned).

Syntax:

view_get_surface_id(view_port)

Returns:

Real

Example:

if view_get_surface_id(0) == -1
    {
    view_set_surface_id(0, global.vSurf);
    }

The above code will check to see if a surface has been assigned to the view port[0] and if it has not then one is assigned.