Cross-regressions between wine and mesa: how to handle them?

[Jerome Leclanche]

On Sun, Jan 26, 2014 at 1:08 PM, Ruslan Kabatsayev
<b7.10110111 at gmail.com> wrote:
> Hi all,
>
> I've come across a problem, which may be simplest to see in the
> following workability diagram, tested on GTAVC on a i915 machine:
> _____________________________________________
> Mesa_\_Wine_|__1.3.21__|__1.5.17__|__1.5.24+_|
> ____9.0_____|____OK____|____OK____|___slow___|
> ___~9.1-____|____OK____|___slow___|___slow___|
> ___~9.1+____|____OK____|_GL_error_|_GL_error_|
>
> Here ~9.1- and ~9.1+ are bisected commits between 9.0 and 9.1, with
> "-" earlier commit and "+" later one.
> "slow" means slide show instead of normal animation.
> "GL error" is a set of errors like
> "err:d3d:device_clear_render_targets >>>>>>>>>>>>>>>>>
> GL_INVALID_FRAMEBUFFER_OPERATION (0x506) from glClear @ device.c /
> 677".
> Wine version 1.5.24+ means any wine newer than 1.5.24 up to 1.7.11.
>
> All these things are related to wine trying to use GLSL as much as
> possible, and Mesa trying to make it seem that it supports OpenGL 2+,
> even on chips like i915, which don't support it.
>
> For end user this looks like failing software, and moreover, it's not
> easy to understand which software does have bug.
> Wine perspective: On the one hand, wine seems to use what Mesa
> exposes. On the other, why use shaders for games which don't need
> them?
> Mesa perspective: On the one hand, it wants to advertise more support
> for latest OpenGL standards. On the other, why do it for very old HW
> which doesn't support it?
>
> So, I'm not sure where I should report these regressions - to
> bugs.winehq.org or to bugs.freedesktop.org? I remember some similar
> bugs reported to wine being closed as UPSTREAM (e.g. bug 33964), and
> fixed (or worked around?) in Mesa. But on the other hand, wine 1.3
> worked perfectly for all Mesa versions - is it really Mesa fault that
> newer versions of wine don't work?
>
> Could someone please explain how to handle such situations?
>
> Regards,
> Ruslan
>
>

Quickest way is most likely to do a regression test in Wine wine Mesa
9.1, file a bug and if there is a mesa regression in the lot (this
might all be normal behaviour), you will be asked to file a bug
upstream on freedesktop.org.

J. Leclanche