[Mesa-dev] New GBM backend for dEQP

[Tapani Pälli]

On 12/17/2016 03:58 AM, Chad Versace wrote:
> Happy Christmas to everyone who's busy squashing dEQP bugs.
>
> I wrote a new GBM backend for dEQP. I even submitted it to dEQP's
> upstream Gerrit.  Pyry, dEQP's maintainer, told me over beer earlier
> this year that he would accept it if I submitted it, and if it wasn't
> too crazy. So, maybe it'll be upstream soon.
>
> If you want to try it out, you can either fetch the patch from Gerrit:
>     $ git fetch https://android.googlesource.com/platform/external/deqp refs/changes/43/315743/1
>
> View it on Gerrit:
>     https://android-review.googlesource.com/#/c/315743/
>
> Fetch from personal my work-in-progress branch:
>     $ git fetch git://git.kiwitree.net/~chadv/deqp refs/heads/wip/gbm
>
> View it on my cgit:
>     http://git.kiwitree.net/cgit/~chadv/deqp/log/?h=wip/gbm
>
> GBM today does not support pixmaps nor pbuffers (eglCreatePixmapSurface
> and eglCreatePbufferSurface), so the dEQP test coverage with GBM does
> not have parity with X11. But, on the other hand, you get to run dEQP
> without the headache of X11.
>
> There's probably bugs. No surprises there.

Branch did not work 'out of the box' for me:

"No rule to make target 'framework/qphelper/.git/index', needed by 
'framework/qphelper/qpReleaseInfo.inl'.  Stop."

(attached patch makes it work for me)

> What prompted my painful misadventures into dEQP's circus of abstract
> factory registries?
>
>     - Some dEQP tests intermittently fail on X11, most likely due to
>       dEQP's misuse of multi-threaded Xlib. See
>       <https://bugs.freedesktop.org/show_bug.cgi?id=98331>.
>       On the new GBM backend, the test results are consistent. They
>       consistently fail ;)
>
>     - Some tests run much faster without the overhead of X11.
>       The dEQP-EGL.functional.negative_api.* tests run almost instantly.
>
>     - Intel's Jenkins prefers headless testing over X11.
>

One issue is that real users will use X11, Wayland or Android. Would be 
cool to have a 'switch' to toggle CI to use a particular backend so that 
most of the time we would run against gbm but then sometimes check that 
X11 still works etc.

// Tapani
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