smithay Can't use `backend.buffer_age()` on winit due to new `bind()` borrowing requirements

df08c6f29eb6ebfa2fce6fc374590483bcbaf21a made bind() mutably borrow the backend, making it impossible to get backend.buffer_age() while it is bound. However, when the backend is not bound, buffer_age() returns None. So effectively you can't use the buffer age on winit currently.

Mar 10 '25 11:03 YaLTeR

I think it actually is possible, since the Renderer doesn't unbind when finishing a Frame, but that is still a super ackward api.

Mar 10 '25 11:03 Drakulix

If I'm not mistaken, GlesTarget unbinds on Drop, and it is one of the things borrowing the backend from bind(). So I'm not sure it's possible

Mar 10 '25 11:03 YaLTeR

If I'm not mistaken, GlesTarget unbinds on Drop, and it is one of the things borrowing the backend from bind(). So I'm not sure it's possible

No, I am pretty sure it doesn't. It destroys framebuffer objects, but it doesn't call unbind to save instructions, if the user just binds the same framebuffer again next cycle.

Mar 10 '25 11:03 Drakulix

https://github.com/Smithay/smithay/pull/1673

Mar 10 '25 11:03 Drakulix