[Wayland-bugs] [Bug 84117] Weston calls eglCreateImageKHR/eglDestroyImageKHR every frame

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84117

Daniel Stone <daniel at fooishbar.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #3 from Daniel Stone <daniel at fooishbar.org> ---
No, this can't actually be fixed. Holding on to EGLImages means that the EGL
implementation can _never_ change its buffering strategy except on resize.
Doing this would actually preclude promotion to overlays in some case: imagine
you have one foreground app and one background app, both of a constant size.
Switch apps so the second is now in the foreground and can be promoted to an
overlay, if allocated from the correct backing store.

The foreground app would need to be able to release its buffers, and the
background app would need to be able to reallocate, but this is not possible if
Weston is still holding a reference to the EGLImage.

Creating and destroying images should be a very lightweight operation of
altering refcounts and adding/removing EGL resource identifiers. The buffers
themselves will _not_ be reallocated or destroyed unless the client-side EGL
(or whatever) implementation has also released its last reference to the
buffer.

If your stack is spending too long in CreateImage/DestroyImage (Vivante?), then
I'd strongly recommending your stack.

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