On Thu, 31 Mar 2016 17:00:37 -0700 "Jasper St. Pierre" <jstpie...@mecheye.net> wrote:
> wl_registry and wl_registry.bind are about globals and creating new > instances of globals. > > A compositor can opt to provide a new global interface by using the > wl_global_create API. Immediately, an event is broadcasted to all > clients: the wl_registry.global event, which contains a name (the > uint32_t parameter), an interface (which is a string). If the user > wants to bind such a global, it passes that back to wl_registry.bind, > to get an instance of that global. > > Why wasn't the interface used instead? I'm not sure. I imagine it was > to enforce that binding is done through the global event rather than > allowing a client to attempt to bind random objects through strings. It is because you can have multiple globals with the same interface, e.g. multiple wl_outputs or multiple wl_seats. These are the non-singleton global interfaces. Names tell the globals apart when the interface alone would not. Thanks, pq > On Thu, Mar 31, 2016 at 4:48 PM, Yong Bakos <j...@humanoriented.com> > wrote: > > Hi, > > I've been investigating the semantics of the name parameter within > > the wl_registry interface, prompted by a recent dialog regarding my > > patch of arg summary attributes in wayland.xml. > > > > I've dug around the Weston source to see what values are passed as > > the name argument, and where it goes... and I'm at a bit of a loss. > > This argument is always an integer, and seems like it's just passed > > around and never even used for anything! I feel like I must be > > missing something, hence this question: what is this `name` > > argument in wl_registry_bind, wl_registry_send_global, and > > wl_registry_send_global_remove? Why is it called name when it is > > merely a numeric identifier? Shouldn't it be called `id`? > > > > I'd love to see where this argument is used within the weston > > source, so if you know a file:line you can point me to, I'll add > > one beer to your queue. > > > > Thank you, > > yong
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