Set or get the height and width of the back buffer. You can use this to let the system scale an image automatically on swapping to a variable-size buffer. The back buffer size remains fixed at the size that you set up regardless of whether the image is resized to display larger onscreen.
The number of frames that the multithreaded OpenGL engine can process before stalling. The default value is 1. New frames are queued when the application calls the flushBuffer method. A larger number may improve overall performance, but adds latency between when a frame is rendered and when a frame is displayed. Interactive applications should leave this value at the default.