I glad you liked it. It was my dream for many years to fix that bug-feature of Q2. And now I achieved that dream - using Pascal, not less!

For the future, I plan, if I manage to find time for that, to add the replacement for the software shader used in Q1 and Q2 software mode under water (blur + distortion). It was also lost because Voodoos were unable to do such things...

I also plan to add a page on my web site for such things.
For now, here's the folder containing the before/after screenshots, for comparsion:
http://host-17-99.imsys.net/_share/_001/_q/