[Mesa-dev] [Bug 97516] GLX_OML_swap_method not fully supported

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97516

Timothy Arceri <t_arceri at yahoo.com.au> changed:

           What    |Removed                     |Added
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                 CC|                            |t_arceri at yahoo.com.au

--- Comment #2 from Timothy Arceri <t_arceri at yahoo.com.au> ---
GLX_SWAP_COPY_OML should be working Thomas Hellstrom added support for it
towards the end of 2017. Partial support was also added for
GLX_SWAP_EXCHANGE_OML below is a direct copy of Thomas's reply when I asked him
what remained to properly expose GLX_SWAP_EXCHANGE_OML [1].

"You need to get the X server AIGLX to advertize it, because the 
available features are the intersection of the X server AIGLX features 
and the dri driver features, even if this is purely implemented in the 
dri client. The reason GLX works this way is that after you've choosen 
your config you can either choose to select a direct or indirect 
context. That was a poor design.

Now the problem is that AIGLX isn't able to support it, because it uses 
the dri driver dri2 path rather than the dri3 path, and I never got to 
modifying AIGLX to use the dri3 path. Didn't think it was worth the 
extra work.

In any case, you can hack-enable GLX_SWAP_EXCHANGE_OML if the client is 
using dri3 by adding __DRI_ATTRIB_SWAP_EXCHANGE to back_buffer_modes[] 
in src/gallium/state_trackers/dri/dri_screen.c, recompile and make sure 
the X server also picks up the recompiled driver. That is if you have a 
gallium driver. This worked fine with vmwgfx at the time I pushed the 
patch as tested by the corresponding piglit test.

For the other dri drivers there should be a similar way to set the 
back_buffer_modes[]."

[1] https://lists.freedesktop.org/archives/mesa-dev/2018-September/204407.html

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