Fix stuck-frame-after-mode-switch bug #3673
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When we perform a mode switch Mir first tears down all the `Compositor`s, does the switch, and then creates a new set of `Compositor`s, one for each output. But, in the buffer queue code, we track which `Compositor`s have accessed the “current” buffer of a surface, and only advance to the most recently submitted buffer when the `Compositor` had already seen the current one. After the mode switch, *all* the `Compositor`s are new, so *none* of them will have seen the “current” buffer, and so will not receive the most recently submitted client buffer until something else triggers a new composite pass. The buffer queue code is going to need to change significantly in the forseeable future to accomodate the requirements of some Wayland extensions, so work around this problem by having each `Compositor` thread mark itself as a user of the “current” buffer on construction, so the first composition pass will receive the most recent buffer.
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Code and new docs look good. @Saviq does this fix the issue on your end?
Edit: Tried to see if I can test on my set up using the built-in display. Mir is convinced it only supports 1920x1080@144 Hz :/
Saviq
approved these changes
Nov 19, 2024
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