Function GLKMathProject 

pub unsafe extern "C-unwind" fn GLKMathProject(
    object: GLKVector3,
    model: GLKMatrix4,
    projection: GLKMatrix4,
    viewport: NonNull<c_int>,
) -> GLKVector3

👎Deprecated: The OpenGL API is deprecated by Apple

Available on crate features GLKMathTypes and GLKMathUtils only.

Safety

viewport must be a valid pointer.