How to enable the rift distortion view on desktop?

I had some issues regarding rendering on oculus, is there a way to enable the desktop view like the demo app tiny room? I checked the code but I still cant figure it out, I didn't write the code originally, just did an upgrade from sdk 0.6 to 1.9, and now it seems getting into some weird rendering problems, the right eye view seems uses a different coordinate system than the left eye, and I am trying to get the rendering showing on desktop to get a clear view. Any help would be appreciated!