https://bugs.kde.org/show_bug.cgi?id=357755
Kevin Kofler <kevin.kof...@chello.at> changed:
What |Removed |Added
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CC| |kevin.kof...@chello.at
--- Comment #3 from Kevin Kofler <kevin.kof...@chello.at> ---
I explained why I implemented this the way I did in my Qt review request:
https://codereview.qt-project.org/#/c/76992/
> Q: Why do you need the special QT_XCB_FORCE_SOFTWARE_OPENGL environment
> variable and the xinitrc.d snippet? Can't you just detect this
> automatically inside Qt?
> A: The problem is that to check what version of OpenGL is supported by the
> driver, I have to initialize it, and after initializing it, it is too late
> to switch to software rendering. So I would have to spawn an external
> helper executable to check that. Doing so all the time is expensive.
> Therefore, I decided to do the check once at session startup and cache the
> result (which is not likely to change) in an environment variable. (And I
> also cache the result of the environment variable lookup inside Qt, to
> minimize the performance hit of the workaround.)
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