Initializes and returns a NSOpenGLContext object using an existing CGL context.
Original signature is '- (id)initWithCGLContextObj:(void *)context'
Available in Mac OS X v10.6 and later.


- context (IntPtr)
- The CGL context to wrap inside the NSOpenGLContext object.

An initialized context.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later)