[Mesa-dev] [PATCH 2/4] glsl/linker: fix location aliasing checks for interface variables

Timothy Arceri tarceri at itsqueeze.com
Thu Oct 19 21:19:55 UTC 2017

On 20/10/17 04:21, Ilia Mirkin wrote:
> On Thu, Oct 19, 2017 at 12:45 PM, Ilia Mirkin <imirkin at alum.mit.edu> wrote:
>> On Thu, Oct 19, 2017 at 12:40 PM, Iago Toral <itoral at igalia.com> wrote:
>>> On Thu, 2017-10-19 at 12:37 -0400, Ilia Mirkin wrote:
>>>> Will this work with SSO shaders? Presumably the validation still has
>>>> to happen, but I don't think cross_validate_outputs_to_inputs() will
>>>> end up getting called.
>>> The piglit tests I mention use SSO so it seems to be working for this.
>>> See for example:
>>> tests/spec/arb_enhanced_layouts/linker/block-member-locations/named-
>>> block-member-location-overlap.shader_test
>> Ah great. I'm a little curious how, since I don't see how
>> cross_validate_outputs_to_inputs would get called for SSO shaders.
>> Perhaps I'm looking at old code.
>> Oh - because that test doesn't test SSO. It's missing a "SSO ENABLED"
>> - can you try with that? It's just using a pipeline, but both shaders
>> are ending up in it.
> BTW, my solution to all this was
> https://patchwork.freedesktop.org/patch/175959/
> but Tim hated it, and I didn't have the time to properly respond.

Hate is a strong word, the problem is it duplicated some of the 
checks/logic in cross_validate_outputs_to_inputs() unnecessarily. The 
checks should be pulled into a helper/helpers that can also be used by SSO.

>    -ilia

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