[Nouveau] [Bug 90871] NV30: Xfwm4 use_compositing - garbled display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90871

--- Comment #48 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Olivier Fourdan from comment #47)
> (In reply to Ilia Mirkin from comment #46)
> > Pretty sure it's what I said -- the test program doesn't do a glXMakeCurrent
> > before calling gl functions, which means their output is invalid. Not an
> > epoxy issue. Rearranging the test program's code to fix this is annoying
> > though.
> 
> No it's not, if the test program is invalid, it ought to be fixed.
> 
> > I wonder if this is a real issue in xfwm code as well.
> 
> Yes, most likely. This code is still early beta in xfwm4. I'll try to fix it
> and Poma will be able to test I guess.

The main reason why it's annoying to fix in the test program is that you use
that knowledge for selecting fbconfigs... which you need to do before making a
context current. Now you could either (a) do a 2-step process whereby you first
see if the ext is there, and then go and select another config or (b) make the
assumption that rect support is an all-or-nothing thing -- either no configs
have it or they all do, so no need to check it when evaluating fbconfig
validity.

I'm moderately sure that'd be a valid assumption.

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