Get Gen4/5 guardband clipping working

chrisforbes / mesa

chrisf's mesa hacks

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Get Gen4/5 guardband clipping working #15

Closed chrisforbes closed 11 years ago

chrisforbes commented 11 years ago

This is forced disabled. Since the clip thread is probably the bottleneck on this hardware, it would be nice to enable it when we can, so fewer threads need to be spawned.

To investigate:

Any known errata in the guardband clipping
Guardband coordinate limits (a bit more restrictive than SNB, IIRC)
Does the clip kernel have to do extra work?
Viewport must cover entire render target surface to avoid spurious fragments

chrisforbes commented 11 years ago

Well, it "works" in my ilk-guardband branch, with caveats:

Some flushing issue, so the new viewport doesn't always apply correctly.
+/- 4K limit.
No real jump in performance

chrisforbes commented 11 years ago

Works, and merged to master.