[Mesa-dev] [PATCH] st/nir: Disable varying packing when doing transform feedback.

Eric Anholt eric at anholt.net
Thu Jul 5 19:44:10 UTC 2018

Timothy Arceri <t_arceri at yahoo.com.au> writes:

> On 03/07/18 05:51, Eric Anholt wrote:
>> Eric Anholt <eric at anholt.net> writes:
>>> [ Unknown signature status ]
>>> Timothy Arceri <tarceri at itsqueeze.com> writes:
>>>> nir_compact_varyings() is meant to skip over varyings used by xfb:
>>>>            /* We can't repack xfb varyings. */
>>>>            if (var->data.always_active_io)
>>>>               continue;
>>>> Any idea why that isn't working in this case?
>>> Looks like GLSL IR has that flag wrong.  points.7 has v_var6,7,8,9
>>> transform feedback output, but the IR says:
>> [...]
>> Any feedback on this?  This is my remaining TF issue for V3D.
> Hmm. I think this still gets messed up because if packing the non-xfb 
> varyings results in freeing up a location then st_nir_assign_var_locations()
> will end up assigning a new location for the xfb varyings.
> I think your patch to disable for xfb is the easiest way to work around 
> this for now. I still hope we might one day have a full NIR GLSL linker 
> to replace GLSL IR but my hopes of ever seeing one are slowly fading.
> Anyway for this patch:
> Reviewed-by: Timothy Arceri <tarceri at itsqueeze.com>


I do wish for better linking as well, but state_tracker's program
handling is so convoluted that I can only ever hold a fraction of it in
my head at a time.
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