To flip the incoming strip you can just replicate the first vertex. However that strip may already begin with a replicated vertex, because of the way we created them. In such cases, we just can discard the first replicated vertex, which flips the strip as well, but saves some space. All the features discussed in this article have been implemented in the companion source code. You re free to include it in your own commercial or non-commercial products, as long as you send me a mail for notification.
Feedback is welcome as well.
Optimizing Triangle Strips for Fast Rendering , IEEE Visualization '96, pp. Edited by Roni Yagel and Gregory M. Nielson.