[osg-users] DefaultFont crash issue

[OpenSceneGraph Users]

Hi Robert,

In relation to the DefaultFont crash issue, I noticed that my code would
occasionally crash on creation of osgText::Text.
Most of my osgText::Text is not created on the main thread.
In order to avoid the DefaultFont crash, I created a
osg::ref_ptr<osgText::Font> necessaryFont = osgText::Font::getDefaultFont();
which sticks around from the beginning of the program to the end and
doesn't get used by anything.
After I did this, my code no longer crashed on osgText::Text creation.
The OpenSceneGraph version used is 3.6.4 and on both Windows (7 64-bit) and
Linux (Ubuntu 16.04).
Also when I was previously using OpenSceneGraph version 3.6.2,
osgText::Text creation never crashed.

Regards,
Anna



On Wed, Jan 29, 2020 at 5:15 PM OpenSceneGraph Users <
osg-users at lists.openscenegraph.org> wrote:

> Hi Robert,
>
> I'm reasonably sure that Fabian's crash isn't the same issue as that
> example exposes.
>
>
>>>    - Fabian has done something weird with either OSG or OpenMW that
>>>    hasn't been specified yet.
>>>
>>> If the codebase is the same perhaps it comes down to a sensitivity to
>> compiler version or dependencies?
>>
>
> We have official builds for a variety of Linux distros, Windows and MacOS
> (and semi-official builds for Android that are generally less reliable) so
> we should have pretty good coverage with known-good dependency and tooling
> versions. As I've mentioned before, the most likely culprit for this
> suddenly appearing for Fabian is that we pretty much never link to OSG
> statically. It's a nightmare on Windows (I don't think anyone's even
> attempted it in the last five years) but is more feasible on Linux, where
> the majority of our contributors are, so I've put out a call for other
> testers to try and reproduce the problem.
>
>
>
> Also, Robert, I'm assuming you don't have a copy of Morrowind to test
> OpenMW with. Right now, Steam, GreenManGaming and Fanatical are all
> offering it for less than £4, but at least one of those sales ends in less
> than twenty hours. If you're not keen, £4 is a reasonable investment for me
> to make to increase cooperation between our projects, but it would help if
> you got back to me quickly.
>
> Thanks,
>
> Chris
>
> On Wednesday, 29 January 2020 14:46:02 UTC, OpenSceneGraph Users wrote:
>>
>> Hi Chris,
>>
>> Thanks the links.  I've tracked down the example you created and re-run
>> it on my system and on the scene graph creation of the second window/view I
>> get text without textures.
>>
>> In summary:
>>>
>>>    - Fabian has done something weird with either OSG or OpenMW that
>>>    hasn't been specified yet.
>>>
>>> If the codebase is the same perhaps it comes down to a sensitivity to
>> compiler version or dependencies?
>>
>>>
>>>    - It's beginning to feel like you're misspelling OpenMW deliberately.
>>>
>>> Sigh.  I likely have dyslexia, while I've never been formally diagnosed
>> I have the traits, the downside is that I regularily get letters wrong,
>> don't spot mispellings.  This isn't personal, it's just an issue I have to
>> deal with, and unfortunately as I read/wrote code and read/write email the
>> community also have to accept that I don't get everything right every
>> time.  In other ways my brain functions pretty well so overall I can still
>> be productive.
>>
>>
>>>    - Regarding the as-yet unresolved default font/object cache not
>>>    being released issue I reported in March, the ball was left in your court
>>>    with nothing more I could do. Hopefully enough has been linked above that
>>>    we can move forward with that again if you've got more time now.
>>>
>>>
>> If this is the one that the attached example recreates then I will be
>> looking into this today.
>>
>>
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