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

[Giovanni Mascellani (＠giomasce)]

Capability Geometry allows to use the Layer builtin in geometry shaders.
For vertex shaders ShaderLayer should be used, but it's only available
starting from SPIR-V 1.5. ShaderViewportIndexLayerEXT can be used instead
with extension SPV_EXT_shader_viewport_index_layer.

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  v3: vkd3d-shader/spirv: Use capability ShaderViewportIndexLayerEXT for decoration ViewportIndex.
      vkd3d-shader/spirv: Use capability ShaderViewportIndexLayerEXT for decoration Layer.

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