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Adds the NonUniform declaration to pretty much everything, even if it's not required. I don't think this will have a huge performance impact, as Nvidia and Intel don't seem to care about this flag, their accesses are always non-uniform, and Amd's driver is really good at figuring out whether something is uniform / scalar across the workgroup / subgroup or not.
You will have to declare
SpirvBuilder::capability(Capability::ShaderNonUniform)
for it to work though.Feel free to cherry-pick these commits if you do need non-uniform now and can't wait until rust-gpu has figured out a proper solution.