[Mesa-dev] glproto changes

Eric Anholt eric at anholt.net
Thu May 5 08:11:53 PDT 2011

On Wed, 4 May 2011 18:21:20 -0700, Jesse Barnes <jbarnes at virtuousgeek.org> wrote:
> On Thu, 5 May 2011 11:17:02 +1000
> Dave Airlie <airlied at gmail.com> wrote:
> > So I wasn't watching and glproto broke its interface, and I think its bad.
> > 
> > Why?
> > 
> > You can no longer bisect things across this point without now moving glproto.
> > glxproto.h:xGLXBufferSwapComplete was a released header file
> > definition, you cannot go back and change history.
> > 
> > This should have been handled with xGLXBufferSwapComplete2 struct that
> > newer mesa and X server could would use
> > instead of the older code. Old code would build against the old broken
> > defintion but since its broken it wouldn't matter,
> > and new code would build against the new fixed definition.
> > 
> > This doesn't address the I need the latest glproto to build mesa and
> > my distro doesn't have which concerns me less
> > than the I can't bisect anymore and I fully agree with Jesse that the
> > last time we tried using #ifdef for this sort of thing it led
> > to a number of untested combos resulting in impossible to debug issues.
> Yes, in hindsight I was too shellshocked by our previous experience
> with dri2 invalidate, ifdefs, and untested paths to even consider
> allowing new code to build with old proto.  But breaking bisect is bad,
> no doubt.
> But in this case adding a separate struct is probably the right thing
> to do, and I'd be happy to do it if people are willing to put up with
> the churn (glproto 1.4.14, dri2proto 2.5 plus changes to Mesa and X to
> use the new struct).

Yes, please do a new struct.  I'm happy to see the churn to make it
happen if it means developers are likely to do better at testing stable

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