gl-renderer: Ensure gl_buffer_state is present for direct-display
This patch makes sure we have a gl_buffer_state present when using direct-display protocol extensions (which forbids any GL imports, and assumes a direct path with the display unit to perform a KMS import).
Without this patch we would basically have no gl_buffer_state at repaint time because we never manged to create one, as direct-display code path will return much early.
Partially fixes gitlab.freedesktop.org/wayland/weston/-/issues/621.
Suggested-by: Pekka Paalanen pekka.paalanen@collabora.com Signed-off-by: Marius Vlad marius.vlad@collabora.com