https://bugs.freedesktop.org/show_bug.cgi?id=94835
--- Comment #2 from Ilia Mirkin imirkin@alum.mit.edu --- (In reply to Edwin Smith from comment #0)
Feral can provide a Steam key to active Mesa engineers working on this issue if that would help their progress.
A little bit off-topic, but would such a key be provided for people working on drivers other than radeonsi? [r600 and nvc0 come to mind]
YOU should be abel to use Intel Mesa as a reference as that draws correctly as it has a higher texture sampler limit.
By the way, that's only true for Haswell and newer. Ivybridge (gen7) is limited to 16, at least on Mesa.