Keith Packard <[email protected]> writes: > Hans de Goede <[email protected]> writes: > >> So it looks like we really need glFinish to ensure proper ordering here >> (and I've just deleted the v2 of this patchset with flush with I had >> prepared). > > If you need glFinish, then your drivers are broken. glFlush and suitable > fences provides sufficient information to allow for synchronization > between operations without also requiring waiting for the hardware to > finish. It's a difference between getting things into the hardware > queues in the right order and waiting for those hardware queues to > drain.
glFlush by the spec does provide any guarantees that things have made it to the kernel. We have just assumed that, but I think the Radeon driver may be violating that assumption these days.
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