[Bug 98993] dosbox artefacts when using opengl

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98993

Michel Dänzer <michel at daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |NOTOURBUG

--- Comment #5 from Michel Dänzer <michel at daenzer.net> ---
This is a dosbox bug, please report it to the dosbox developers:

Making an apitrace of the problem and analyzing it in qapitrace, one can see
that as of the third frame, dosbox no longer calls glClear and only draws to
the area covered by the DOS shell, not to the borders left and right of it.
Clearly, dosbox assumes that there are at most two buffers and that their
contents are preserved after glXSwapBuffers, but there are no such guarantees
(not even with DRI2, e.g. xf86-video-intel supports triple buffering with that
as well).

What dosbox could do is use e.g. the GLX_EXT_buffer_age extension to find out
which parts of the current back buffer don't need to be redrawn.

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