simple-shm: honour wl_buffer.release

Change simple-shm to properly process the wl_buffer.release event, and
not reuse a buffer until it is released by the server, as specified in
the protocol.

In case the server has not released the buffer, but signals that it has
been shown (frame callback), allocate a second buffer. Simple-shm will
now automatically do double-buffering if needed.

Signed-off-by: Pekka Paalanen <ppaalanen@gmail.com>
1 file changed