[Bug 67846] Using 2 screens impossible again with gen3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67846

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
xrandr actually reports that the maximum fb size is 32k by 32k because the
hardware doesn't impose any such limitation on the fb. Individual CRTCs are
pruned to fit in the 4096x4096 hw limit of the pipes (and modes are pruned in
case they advertise a mode too large for an individual CRTC or too be able to
fit into memory). All this can be hardware accelerated even though the 3D
pipeline is limited to maximum coordinate values of 2048x2048 (most operations
do not exceed 2048x2048 and those that do can be tiled).

Unity however has to respect the GL limits, which I think at the moment report
a maximum framebuffer size of 4096x4096. Leading to the hilarity you have
discovered.

I share the opinion of the GL team, that one should not use GL in any system
critical component.

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