How to get a program SBS

If you are using the SDK rendered mode, you can try just feeding the same render target into both left and right buffers. I think that should work OK, but I haven't tried it.

Hmm... the program that I'm making doesnt connect directly to the rift, and its for extended. Im not sure how I can make it SDK rendered mode though. Also, the app doesnt use UE4 or Unity.

Edit: Im sorry, I should have been more specific on the first post :/

You would use the C++ SDK, for example to combine with a DirectX or OpenGL application.

I didnt think that i needed the SDK just to mirror the program twice... Well, Ill download it and see what happens.

The reason you need the SDK is because you need more than SBS to support the Rift. In specific, the distortion and chromatic aberration correction are calculated by the SDK. Head-tracking is also important, even if you just float a 2D quad in space. Plus, there are rendering parameters that come from the user's profile (IPD, FOV, etc.) and these are necessary for the most comfortable experience.

I think Stellarium is Open GL. I have headtracking already, using FreePIE(it makes the oculus a mouse), and I need it almost as simple as possible because this is literally my first program that I'm making for the Oculus. I also tried to use the SDK, and
I can't figure out how to use it. Are there any tutorials?

Start by reading the Oculus Developer Guide:

https://developer.oculus.com/documentation/