StageInOutAttribute

The annotated struct is used to pass data into shader stages and to return data from shader stages.

The fields of all structs that are used as input for a shader stage must each have a unique usage semantic, which may either be a system value (see System) or one of the following: Color, Normal, Position, Tangent, TexCoord. This restriction ensures that input/output mapping in HLSL will work as expected.