Re: [PATCH v3 0/2] MR546: Draft: vkd3d-shader/spirv: Enable capability ShaderViewportIndexLayerEXT when needed.

[Giovanni Mascellani (＠giomasce)]

Ok, I wrote the extension glue code. I also added a patch for decoration `ViewportIndex`, given that it's very similar. I was asked to write tests, though, so I'll do that at some point.

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/546#note_57033