On Mon, 29 Mar 2021 15:36:27 +0000 Simon Ser <contact@xxxxxxxxxxx> wrote: > On Monday, March 29th, 2021 at 5:32 PM, Paul Cercueil <paul@xxxxxxxxxxxxxxx> wrote: > > > Making the second plane an overlay would break the ABI, which is never > > something I'm happy to do; but I'd prefer to do it now than later. > > Yeah, I wonder if some user-space depends on this behavior somehow? > > > I still have concerns about the user-space being "clever" enough to > > know it can disable the primary plane. Can e.g. wlroots handle that? > > wlroots will always pick the first primary plane, and will never use > overlays. The plan is to use libliftoff [1] to make use of overlay > planes. libliftoff should already support the scenario you describe. > > I think Weston supports that too. Weston supports overlays, but I don't think it will try without "the" primary plane, IIRC. I'd need to verify. I'm not quite sure what Weston would do with multiple primary planes. It probably picks one for a CRTC ahead of time, and then sticks to it, always using it. But if Weston never worked with a driver to begin with, it also can't regress, so you're safe. Thanks, pq > > [1]: https://github.com/emersion/libliftoff > _______________________________________________ > dri-devel mailing list > dri-devel@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/dri-devel
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