[Bug 64879] New: i915 doesn't do derivatives, neither gallium nor intel driver

[Bug 64879] New: i915 doesn't do derivatives, neither gallium nor intel driver

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https://bugs.freedesktop.org/show_bug.cgi?id=64879

          Priority: medium
            Bug ID: 64879
                CC: idr@freedesktop.org
          Assignee: dri-devel@lists.freedesktop.org
           Summary: i915 doesn't do derivatives, neither gallium nor intel
                    driver
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: fjhmesabug@gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/i915g
           Product: Mesa

Any way to support dFdx() on i915?

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[Bug 64879] i915 doesn't do derivatives, neither gallium nor intel driver

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https://bugs.freedesktop.org/show_bug.cgi?id=64879

Eric Anholt <eric@anholt.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |WONTFIX

--- Comment #1 from Eric Anholt <eric@anholt.net> ---
Other than the sw fallback, no.

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[Bug 64879] i915 doesn't do derivatives, neither gallium nor intel driver

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https://bugs.freedesktop.org/show_bug.cgi?id=64879

--- Comment #2 from fjhenigman <fjhmesabug@gmail.com> ---
The software rendering fallback in the intel driver is pretty slick.  The
gallium driver has nothing like that, correct?

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[Bug 64879] i915 doesn't do derivatives, neither gallium nor intel driver

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https://bugs.freedesktop.org/show_bug.cgi?id=64879

--- Comment #3 from Roland Scheidegger <sroland@vmware.com> ---
(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).

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[Bug 64879] i915 doesn't do derivatives, neither gallium nor intel driver

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https://bugs.freedesktop.org/show_bug.cgi?id=64879

--- Comment #4 from Marek Olšák <maraeo@gmail.com> ---
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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