Now (almost) all 3D modes are ready! Here is a set of example screenshots:

No 3D:

Anaglyph:

Vertical anamorphic stereopair with interlacing:

Horizontal anamorphic stereopair with interlacing:

Vertical anamorphic stereopair:

Horizontal anamorphic stereopair:

Oculus Rift:

You can see a lot of settings in each mode: interpupillary distance, 3D depth, swap left/right, interface depth and size (for Oculus). In anaglyph mode you can adjust the color mask to match it with your glasses. Amusingly that I have Oculus Rift and a 3D TV, but I don't have anaglyph glasses. So I can't test the anaglyph image, but as long as it matches anamorphic stereopairs by geometry, I think it must work. Also, active (shutter) 3D mode is not implemented, this is my next step.

Another set of screenshots, with better depth:

No 3D:

Anaglyph:

Vertical anamorphic stereopair with interlacing:

Horizontal anamorphic stereopair with interlacing:

Vertical anamorphic stereopair:

Horizontal anamorphic stereopair:

Oculus Rift: