[Wayland-bugs] [Bug 98766] We need fences support in Wayland compositors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98766

--- Comment #11 from James Jones <jajones at nvidia.com> ---
Not proposing baking in any particular backend assumptions or debating whether
Khronos or Linux assumptions are better, but rather I was indirectly suggesting
a few modifications to make the overall extension less dependent on any
particular type, and allow persistence

-Register fences as a new wayland object type prior to actual attachment,
similar to how wl_surface abstracts DRM/shm/etc.  This makes persistence easy
when the underlying objects support it, and since apparently wayland object
creation is cheap, shouldn't add appreciable overhead where persistence doesn't
matter or doesn't work.

-Explicitly name the type of the FD being registered.  If dma-fence/sync FD is
the only type available in rev1, that's fine, but it's an easily extensible
API.

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