[Development] ANGLE upgrade plans for 5.6/5.7

[Andreas Holzammer]

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.

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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> 
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-- 
Andreas Holzammer | andreas.holzammer at kdab.com | Senior Software Engineer
KDAB (Deutschland) GmbH&Co KG, a KDAB Group company
Tel: +49-30-521325470
KDAB - The Qt Experts

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