Interfaces to objects

[Stephen Lee]

Hey, I'm working on my own window manager and I'm having a hard time
tracking through the Weston code to see where a function is registered as
part of an interface. Right now I am looking at surfaces. I guess my
question is more related to the relation of surface and shell surface. In
the main compositor file, their is a struct called surface_interface which
is passed into 'wl_resource_set_implementation' along with a resource
'wl_surface_interface'. Okay, that is clear enough, but now in shell.c
their are a bunch of functions in the 'shell_surface_implementation' struct
which again has a resource created and implemented for
'wl_shell_surface_interface'. Also in the module_init their is a global
created to 'bind' the compositor to another struct for 'desktop' stuff. How
do all of these things relate? Is surface similar to a base class and
shell_surface similar to an inherited class?
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