Bug 64879 - i915 doesn't do derivatives, neither gallium nor intel driver
Summary: i915 doesn't do derivatives, neither gallium nor intel driver
Status: RESOLVED WONTFIX
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Gallium/i915g (show other bugs)
Version: git
Hardware: Other All
: medium normal
Assignee: Default DRI bug account
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Reported: 2013-05-22 20:11 UTC by fjhenigman
Modified: 2013-05-23 21:50 UTC (History)
1 user (show)

See Also:
i915 platform:
i915 features:

Attachments

Description fjhenigman 2013-05-22 20:11:44 UTC 
Any way to support dFdx() on i915?
Comment 1 Eric Anholt 2013-05-22 20:37:55 UTC 
Other than the sw fallback, no.
Comment 2 fjhenigman 2013-05-23 19:21:38 UTC 
The software rendering fallback in the intel driver is pretty slick.  The gallium driver has nothing like that, correct?
Comment 3 Roland Scheidegger 2013-05-23 20:33:17 UTC 
(In reply to comment #2)
> The software rendering fallback in the intel driver is pretty slick.  The
> gallium driver has nothing like that, correct?
Nope. Not sure though what you mean by pretty slick, in my experience it is usually useless due to glacial performance (though I guess maybe it's better thanks to UMA compared to old radeons).
Comment 4 Marek Olšák 2013-05-23 21:50:54 UTC 
FYI, the old failover module was actually capable of switching between a hardware driver and softpipe in the middle of rendering. It should be possible to implement something similar for i915g, though it might be a lot of work.

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