An object that determines how attribute data is stored in memory and how it is mapped to the arguments of a vertex function.
- iOS 8.0+
- macOS 10.11+
- tvOS 9.0+
A vertex attribute descriptor provides organization information so a vertex shader function can locate and load data into its arguments. The descriptor maps memory locations to attribute locations. It supports access to multiple attributes (such as vertex coordinates, surface normals, and texture coordinates) that are interleaved within the same buffer.