Martin Graesslin <mgraess...@kde.org> writes: > On Thursday, November 19, 2015 1:54:22 PM CET Martin Peres wrote: >> On 11/11/15 00:44, Eric Anholt wrote: >> > Martin Peres <martin.pe...@linux.intel.com> writes: >> >> The preserved swap behavior is currently untested in piglit and not >> >> supported on the GLX side. Before working on implementing it for >> >> EGL/DRI3, let's disable it until support comes. >> >> >> >> This patch is trivial enough and will likely be squashed in the commit >> >> egl/x11: Implement dri3 support with loader's dri3 helper >> >> >> >> Signed-off-by: Martin Peres <martin.pe...@linux.intel.com> >> > >> > This looks good to me. I don't think anybody really cares about >> > SWAP_BEHAVIOR_PRESERVED -- the buffer_age stuff was what you really >> > wanted all along. >> >> Hey Eric and Martin, >> >> It seems like KWin is relying on SWAP_BEHAVIOR_PRESERVED for its EGL >> backend. Should we add proper support for it in mesa or should we >> propose a patch for kwin to test for the extension to be present before >> using it? >> >> Martin, what is your opinion on this since buffer age is what you need >> and you already have support for it for the glx and wayland backends? > > That's certainly a left over from before buffer age. I don't know whether we > can remove it unconditionally. Not every GLES harware which does support X11 > supports buffer age. > > I assume the smartest thing to do is not ask for PRESERVED if buffer age is > supported.
Yeah, you definitely want to not ask for PRESERVED if you can handle buffer age, since PRESERVED means losing page flipping. (Part of why PRESERVED was a bad idea from day 1)
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