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.