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List:       mesa3d-dev
Subject:    Re: [Mesa3d-dev] Indirect rendering to old Xservers...
From:       Ian Romanick <idr () freedesktop ! org>
Date:       2009-02-28 1:13:41
Message-ID: 49A88FC5.8000404 () freedesktop ! org
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Matthias Hopf wrote:
> I haven't noticed until recently (due to a bug opened against our
> openSUSE 11.1) that indirect rendering via GLX doesn't work any more
> when an older Xserver is involved.

Can you be more specific?  What commands don't work?  Can you run
glxinfo on one machine using the display on another?

> Some research brought up that this had been broken knowingly:
> 
> git commit #1087cc61b3776f:
> 
> Author: George Sapountzis <gsap7@yahoo.gr>  2008-06-13 14:54:08
> 
> glx: load swrast_dri.so
> 
> caveats:
>  - does not work with old (i.e. libGLcore) xserver:
> [...]

Eh...what?  What repo is that?  swrast_dri.so doesn't have anything to
do with the GLX protocol.  I'm not really sure what is meant by that
comment.  George?

> IMHO this is a no-go - the protocol layer is standardized, and I don't
> know why this had to be broken. Given that I don't understand the
> benefits of direct software rendering (compared to indirect) I just
> use the applied patch to disable it again. I haven't seen any serious
> side effects so far.

There is quite a bit of functionality for which there is no indirect
rendering protocol.  Also, client-side software rendering is usually
faster than server-side software rendering.

> Now there might be caveats I don't see, so my question is twofold:
> 
> - What does my patch break (besides client side direct software
>   rendering, which IMHO is irrelevant)?
> 
> - How can this be fixed for good (using client side direct software
>   rendering if the Xserver is capable of dealing with it, reverting to
>   indirect otherwise)?


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