Function CGLGetParameter 

pub unsafe extern "C-unwind" fn CGLGetParameter(
    ctx: CGLContextObj,
    pname: CGLContextParameter,
    params: NonNull<i32>,
) -> CGLError

👎Deprecated: The OpenGL API is deprecated by Apple

Available on crate feature CGLTypes only.

Safety

• ctx must be a valid pointer.
• params must be a valid pointer.