Function CGLDescribeRenderer 

pub unsafe extern "C-unwind" fn CGLDescribeRenderer(
    rend: CGLRendererInfoObj,
    rend_num: i32,
    prop: CGLRendererProperty,
    value: *mut i32,
) -> CGLError

👎Deprecated: The OpenGL API is deprecated by Apple

Available on crate feature CGLTypes only.

Safety

• rend must be a valid pointer.
• value must be a valid pointer or null.