The first change you notice is that rcBuildContext is now called just rcContext. The second change you may notice that the time query functions are gone, and how there is startTimer()and stopTimer() instead. The third change is that you can disable the virtual function calls using a boolean flag if you want to.
These changes should make the rcContex simpler to implement and maintain.
Available in R206, the VC project is broken until I get back to my win machine again.