[Mesa-dev] [Bug 97957] Awful screen tearing in a separate X server with DRI3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97957

--- Comment #16 from Thomas Hellström <thellstrom at vmware.com> ---
(In reply to Fredrik Höglund from comment #15)
> (In reply to Thomas Hellström from comment #13)
> > It sounds to me like a back- to back SwapBuffers() is an application bug.
> > The back buffer content is undefined after a SwapBuffers().
> 
> It is not undefined when the implementation supports EXT_buffer_age.

Well it may be for some buffers. Whether or not the app uses EXT_buffer_age
correctly in this case doesn't really matter as there are apps out there that
most certainly don't. Perhaps we can use a driconf option for such apps to
restrict available swap methods.

But most importantly there is a mesa dri3 bug here. And looking closer at the
code the glx/dri implementation of GLX_OML_swap_method appears utterly broken,
so it will take some time to fix.

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