This is apparently not suitable: the MTLDevice's registryID is stable
across processes and allows identifying a device (GPU), but the
value may apparently change when the system is rebooted. We see this
both in the CI's M1s and also locally. There may also be differences
between Intel or discreet graphics vs. Apple Silicon based machines
but that we won't be able to investigate further.
Inspired by MoltenVK, stop using the registryID as our "device id",
and instead store the OS version in the cache header. Combined with
the device name this should be good enough.
To generate a device/vendor ID, that we give up for now, those will
be 0 in the QRhiDriverInfo like they are for OpenGL.
This should prevent the "Metal device ID does not match" warnings
that tend to pop up in CI logs and elsewhere. (it also improves
performance, obviously since there is no reason we could not
reuse the disk cache on the same machine where nothing really
has changed, and now we will not incorrectly throw away the
previously written cache contents)
Change-Id: Ib457f6671aceb51f5a9d241702b418aafc888e51
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Andy Nichols <andy.nichols@qt.io>
46bd6cd051