[Development] ANGLE upgrade plans for 5.6/5.7

Andrew Knight andrew.knight at intopalo.com
Mon Sep 21 14:45:58 CEST 2015


Hi,

On 09/21/2015 02:04 PM, Andreas Holzammer wrote:
> Hi,
>
> Am 21.09.2015 um 12:49 schrieb Knoll Lars:
> <snip>
>> I’d only like to get a confirmation from the WEC maintainers, that they
>> are ok with this plan as well.
> So for WEC angle is not build nor used. As on WEC Direct X would be
> build with OpenGL ES2 and yeah angle then would do it the other way
> around, so OpenGL ES2 is used in the first place. But what we do use is
> the Windows OpenGL ES2 interface which was made for Angle, so that part
> we need, but certainly not the library Angle.

Yes, the EGL interaction in the Windows QPA plugin is independent of the 
ANGLE DLLs.

So, I think this is settled - no need to support ANGLE in VS2012 builds.

>
> Thank you
>
> Andy
>
>
>
>> Cheers,
>> Lars
>>
>> On 21/09/15 11:50, "Andrew Knight" <andrew.knight at intopalo.com> wrote:
>>
>>> Hello,
>>>
>>> tl;dr: I propose that the copy of ANGLE currently in the 5.6 branch of
>>> qtbase be maintained without being upgraded for the next minor release
>>> of Qt (5.6). For Qt 5.7 and beyond, we should upgrade ANGLE from
>>> upstream while dropping support for VS2010 and VS2012.
>>>
>>> Around each minor Qt release someone (usually me) updates the
>>> third-party ANGLE sources in qtbase. The last time this happened was for
>>> Qt 5.5, imported from Chromium branch 2356, dated 01 April 2015.
>>>
>>> Since then (and including a good chunk of code up to that commit), the
>>> Chromium project has adopted C++11 and C99 usage in its codebase (due to
>>> switching to VS2013 as the minimum Microsoft compiler). That means a
>>> great deal of code no longer builds with older VS versions, and we
>>> already patched ANGLE for VS2010/VS2012 in Qt 5.5 to deal with some of
>>> these issues. Due to the invasiveness and backward thinking of such
>>> patches, they will not be accepted upstream.
>>>
>>> Since then, the amount of such required changes to upstream ANGLE has
>>> exploded; the upkeep required here is truly non-trivial. Therefore, I
>>> now propose that we *do not* upgrade ANGLE for 5.6. Post-5.6, we will no
>>> longer apply patches to support older compilers. The version in Qt 5.6
>>> will be maintained as any other third-party library in Qt (receiving
>>> patches as needed), while Qt 5.7 will only support VS2013 and newer (as
>>> well as recent versions of MinGW, but that is tangential to this
>>> discussion).
>>>
>>> As Qt 5.7 will already drop support for VS2010, I believe the only
>>> supported compiler this affects is VS2012. This compiler is supported
>>> for Windows Embedded purposes, a platform which does not use ANGLE
>>> anyway (see opengl.prf for details; a WinCE SDK normally provides its
>>> own GL stack). For keeping VS2012 Desktop binaries building, we will
>>> need to forcefully disable ANGLE for that compiler. I think this is a
>>> fair trade-off, and one which has already has a precedent set by Qt
>>> WebEngine.
>>>
>>> Now is the time to speak up (I'm looking at you, Windows and WinCE
>>> maintainers) if there is something wrong with the above proposal. Of
>>> course, inaction will probably lead to the same result: ANGLE will not
>>> be upgraded for 5.6, and we can revisit the issue nearer to the 5.7
>>> release when it's time to upgrade again.
>>>
>>> That said, any ANGLE-specific bugs can be assigned to me and I will do
>>> my best to fix them or back-port the relevant changes from upstream as
>>> needed.
>>>
>>> Cheers,
>>> Andrew
>>> _______________________________________________
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>>> Development at qt-project.org
>>> http://lists.qt-project.org/mailman/listinfo/development
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>
>
>
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