[Mesa-dev] [PATCH] i965: consider a 'base level' when calculating width0, height0, depth0

[andrey simiklit]

Hello,

Could somebody help me with a push of the following patch?
https://patchwork.freedesktop.org/patch/254397

This fix is needed to fix these fails:
https://mesa-ci.01.org/global_logic/builds/56/group/ac3c5a0dc1f15492570367c6c8ec835c

When this fix is pushed we will be able to remove the following test:
tex-upside-down-miptree
from Intel CI "[expected-crashes]" sections.

Thanks,
Andrii.

On Mon, Jan 14, 2019 at 3:05 PM andrey simiklit <asimiklit.work at gmail.com>
wrote:

> Hello,
>
> The test for this issue is pushed to the piglit.
> It would be great to push the mesa fix too if it is still an acceptable
> for all :)
>
> Thanks,
> Andrii.
> On Sat, Oct 20, 2018 at 12:29 PM andrey simiklit <asimiklit.work at gmail.com>
> wrote:
>
>> Hello,
>>
>> On Fri, Oct 19, 2018 at 15:14 Kenneth Graunke <kenneth at whitecape.org>
>> wrote:
>>
>>> On Thursday, October 11, 2018 12:12:38 PM PDT Kenneth Graunke wrote:
>>> > On Thursday, October 11, 2018 11:58:40 AM PDT Kenneth Graunke wrote:
>>> > > On Tuesday, October 2, 2018 9:16:01 AM PDT asimiklit.work at gmail.com
>>> wrote:
>>> > > > From: Andrii Simiklit <andrii.simiklit at globallogic.com>
>>> > > >
>>> > > > I guess that when we calculating the width0, height0, depth0
>>> > > > to use for function 'intel_miptree_create' we need to consider
>>> > > > the 'base level' like it is done in the
>>> 'intel_miptree_create_for_teximage'
>>> > > > function.
>>> > > >
>>> > > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107987
>>> > > > Signed-off-by: Andrii Simiklit <andrii.simiklit at globallogic.com>
>>> > > > ---
>>> > > >  .../drivers/dri/i965/intel_tex_validate.c     | 26
>>> ++++++++++++++++++-
>>> > > >  1 file changed, 25 insertions(+), 1 deletion(-)
>>> > >
>>> > > I believe this patch is correct - we're assembling things into a new
>>> > > miptree, which we start at level 0 - so we need the sizes for level
>>> 0.
>>> > >
>>> > > Alternatively, we might be able to pass validate_first_level instead
>>> > > of 0 when calling intel_miptree_create, to make one that's only good
>>> > > up until the new base...and have to re-assemble it the next time they
>>> > > change the base.  It would save memory potentially.  But more copies.
>>> > > I don't have a strong preference which is better.
>>> > >
>>> > > Please do make a Piglit or dEQP test for this.
>>> > >
>>> > > Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
>>> >
>>> > Sorry, withdrawing my review. :(  Chris Forbes pointed out on IRC that
>>> > your reproducer case is backwards:
>>> >
>>> > miplevel 0 - 1x1
>>> > miplevel 1 - 2x2
>>> > miplevel 2 - 4x4
>>> >
>>> > That's upside down.  A proper miptree would have the base be largest:
>>> >
>>> > miplevel 0 - 4x4
>>> > miplevel 1 - 2x2
>>> > miplevel 2 - 1x1
>>> >
>>> > So, yes, I could see this tripping an assert...but such a crazy texture
>>> > will never be mipmap complete.  If they're expecting mipmapping, then
>>> > it seems like they should get a fallback black texture (which normally
>>> > happens for incomplete textures).  If not, maybe they should get a
>>> > single miplevel?  Either way, seems like we should detect insanity and
>>> > bail, rather than change size calculations for the normal sane case.
>>> >
>>>
>>> So...looked at this again.  I'm not sure why upside-down matters.
>>>
>>> At DrawArrays time, we have a single miplevel (base = 2), and are trying
>>> to put that single miplevel's image into a miptree.  We do properly
>>> ignore levels 0..1 as they're beyond the base.
>>>
>>> We appear to use level 0 as the actual base, and want to store our
>>> single level at level 2.  Other places (TexImage) seem to work that way
>>> too.
>>>
>>> But, we're creating the miplevel with level 0 as the base, but where
>>> level 0 has the dimensions of level 2.  This doesn't work.  And your
>>> patch fixes that.
>>>
>>> I tried making the actual base of the unified tree be level 2, rather
>>> than level 0...so that the BaseLevel is the actual base...but tons of
>>> things broke.
>>>
>>> So, back to Reviewed-by.  I think once we get a Piglit test, I'm happy
>>> to land this patch.
>>
>>
>> Thanks for reviewing :-) I will start to work on it as soon as come back
>> from vacation (on Monday)
>>
>>
>>>
>>> --Ken
>>
>>
>> Thanks,
>> Andrii.
>>
>
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