[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 #13 from Thomas Hellström <thellstrom at vmware.com> ---
It sounds to me like a back- to back SwapBuffers() is an application bug. The
back buffer content is undefined after a SwapBuffers().

But we shouldn't present a back buffer that's already in the swap chain. Hence
the attached patch.

Also, we should perhaps considering implementing and advertizing
GLX_SWAP_COPY_OML and GLX_SWAP_EXCHANGE_OML on dri3. There seems to be apps
relying on the GLX_SWAP_COPY_OML behavior. Among others glretrace playing back
traces captured on WGL.

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