Increments the retain count on a CGL rendering context.
Original signature is 'CGLContextObj CGLRetainContext ( CGLContextObj ctx );'
Available in Mac OS X v10.5 and later.


- ctx (IntPtr)
- MISSING

The same context that was passed into the function.

- Available in Monobjc Bridge: 10.6 (For Mac OS X 10.6 and later), 10.5 (For Mac OS X 10.5 and later)