[Mesa-dev] [Bug 99116] Wine program showing only a blackscreen when using mesa

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99116

Boyan Ding <stu_dby at 126.com> changed:

           What    |Removed                     |Added
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                 CC|                            |stu_dby at 126.com

--- Comment #7 from Boyan Ding <stu_dby at 126.com> ---
Created attachment 128992
  --> https://bugs.freedesktop.org/attachment.cgi?id=128992&action=edit
mesa/st: Add both front and back buffer if the visual is double-buffered

After tracking the command stream with the help of virgl and vtest, I found the
problematic traces request for a double buffer visual but render to the front
buffer. In this case, st will only add back buffer to the attachments of the
window framebuffer. When rendering, the front buffer cannot be found and the
frame is rendered with no color attachments. Meanwhile, i965 adds both front
and back buffer in this case so it renders okay. The patch attached changes
st's way to that of i965's and seems to fix the problem.

If it is reasonable, I'll send it to the ML.

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