How many Backbuffers?

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Indiepath

I seem to be able to open a single-buffered display in OpenGL no problem, no backbuffer. Drawing to the back draws to the front.

Are you telling me that you can see your drawing results without a flip?

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I think that there is some confusion here about how all this flipping works.

Windowed Mode
Blits Backbuffer to Primary Surface (No Flipping) - Backbuffer remains as backbuffer

FullScreen Mode
Flips BackBuffer with Primary Surface - BackBuffer becomes primary and primary becomes BackBuffer.

So in fullscreen when you draw shape 1 it gets drawn to the Backbuffer, you flip, shape 1 is now in the primary buffer, you draw shape 2 and it's now drawn to the new backbuffer (old primary), do a flip and you draw shape 3 and it will be in the same buffer as shape 1.

Make sense?