Intel Has Buggy HiZ Support Published

[phoronix]

Phoronix: Intel Has Buggy HiZ Support Published

Chad Versace of Intel has published a set of nineteen patches to the Mesa mailing list that implement HiZ and depth resolve support for the Intel Linux graphics driver. Unfortunately, it's not without some regressions...

http://www.phoronix.com/vr.php?view=OTkzOQ

[darkbasic]

Does it work for GM45?

[brent]

How does this affect performance?

[darkbasic]

HiZ usually gives a nice boost (up to 30% in R300g)

[Kayden]

Does it work for GM45?

No, GM45 has no hardware support for HiZ. Ironlake (the successor) was the first to introduce it, but in a way that's not very useful; right now we're only targeting Sandybridge and Ivybridge.

[TechMage89]

HiZ is fairly effective at avoiding doing unnecessary work, and often gives a noticeable speedup.

Which Intel IGPs support this?

[darkbasic]

No, GM45 has no hardware support for HiZ. Ironlake (the successor) was the first to introduce it, but in a way that's not very useful; right now we're only targeting Sandybridge and Ivybridge.

And what about h264 VA-API decoding? Do you know if there is someone still working on it?

[Kayden]

And what about h264 VA-API decoding? Do you know if there is someone still working on it?

As far as I know, yes...though I can't say for sure as I'm not involved with media.