[Mesa-dev] MESA_EXTENSION_OVERRIDE problem

[Brian Paul]

On Thu, Nov 19, 2015 at 7:04 PM, Ian Romanick <idr at freedesktop.org> wrote:

> On 11/19/2015 05:40 PM, Nanley Chery wrote:
> >
> > On Thu, Nov 19, 2015 at 12:13 PM, Brian Paul <brianp at vmware.com
> > <mailto:brianp at vmware.com>> wrote:
> >
> >     Hi Nanley,
> >
> >
> > Hi Brian,
> >
> >
> >     Maybe you can fix an issue I have with the new extension code.
> >
> >     Previously, I could do something like export
> >     MESA_EXTENSION_OVERRIDE="-ARB_clear_buffer_object" and I would no
> >     longer see it in the GL_EXTENSIONS string, even if it was an "always
> >     on" extension.
> >
> >     Now when I try that I get:
> >
> >     Mesa 11.1.0-devel implementation error: Trying to disable
> >     permanently enabled extensions: GL_ARB_get_texture_sub_image
> >     Please report at
> https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa
> >
> >     The whole point of the "-GL_EXT_foobar" syntax was to hide an
> >     extension from the application when it queries the driver's
> extensions.
> >
> >     Can you please fix this so it works as before?
> >
> >
> > I have two branches that provide the ability to disable permanently
> > enabled extensions:
> > 1. The first only modifies the extension strings and is located here:
> > http://cgit.freedesktop.org/~nchery/mesa/commit/?h=mod_always_on
> > <http://cgit.freedesktop.org/%7Enchery/mesa/commit/?h=mod_always_on>
> > 2. The second modifies the extension strings and disables the extension
> > within the driver (assuming appropriate the helper function is used). It
> > also provides some performance benefits. :
> > http://cgit.freedesktop.org/~nchery/mesa/commit/?h=init_ext_vals
> > <http://cgit.freedesktop.org/%7Enchery/mesa/commit/?h=init_ext_vals>
> >
> > I'd appreciate any feedback on the two approaches as I work to get the
> > feature upstreamed.
>
> I think #2 might be better, but there's a lot of churn.  I don't know
> that we want that much churn right around the time of the release branch
> point, and I think it would be good to have this resolved in 11.1.  I
> also have a few bits of feedback in #2, so it might take a couple
> iterations before that could land.
>
>
Since 11.1 is coming up, can we go with the simpler #1 for now, then go to
#2 after 11.1 branches?

-Brian
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