[krita] [Bug 445561] Krita 5 16bit integer colorspace canvas rendering is broken on M1

[Dmitry Kazakov]

https://bugs.kde.org/show_bug.cgi?id=445561

--- Comment #16 from Dmitry Kazakov <dimula73 at gmail.com> ---
Hi, Ivan!

Here is one more test for you. Please apply the following patch and try to load
the failing image on M1:

https://invent.kde.org/-/snippets/1983

The patch does two things:

1) It adds asserts to all the buffer-related calls. If the calls fails, then it
will dump debugging info an crash.

2) It adds asserts to sanity check the current openGL context when creating
buffers and when accessing them. That sounds as a quite possible cause of the
problem. It might be that the buffers are allocated in a different openGL
context, therefore they are inaccessible when we really need. If you happen to
trip over any of these asserts, please also check what context is enabled
instead of KisOpenGLCnavas2::context() and whether this context belongs to the
same QOpenGLContext::shareGroup()  as the canvas' context.

PS:
Btw, could you also check if openGL contexts do actually support sharing and
add the following line into the end of KisOpenGLCanvas2::initializeGL():

ENTER_FUNCTION() << this << ppVar(context()->shareGroup()->shares());

There should be at least two contexts, the canvas one and the Qt's one.

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