Retrieves the byte offset to the element with the given semantic name and index.
It is more efficient to retrieve this value once and store it to a variable when setting data of
multiple vertices than to set each vertex' data by semantic name / index.

Return Dword = DX11 GET VERTEX LAYOUT ELEMENT OFFSET(vertLayout, semanticName, [semanticId])

vertLayout

Dword
The vertex layout to get the offset to a certain semantic of.

semanticName

String
The name of the semantic to get the offset of in the given vertex layout.

[Optional] semanticId

Dword
The id of the semantic name if there are several. Defaults to 0.

The offset (in bytes) to the vertex element with the given semantic, or DX11_NO_SUCH_SEMANTIC (0xffffffff) if there is no such semantic data present in the given vertex layout.

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