Pretty much, but also our goal is to recreate the code in a way that R* could have plausibly written it. And that implies no C++11.

To add to what aap mentioned, it also made it relatively easy to compile re3 and reVC with the original IDE it was written in - CodeWarrior 7. Some things accidentally made it in, like sized enums, but overall no major surgery required, or rather, far less than I expected.

We were lucky that we had symbols from PS2 gta3 and the android games. other than that it was a lot of reading code in IDA and massaging it back into c++. I made a little video about part of the process [1] but i never did part 2.

The strategy for gta3 was to replace function by function of the game until we had everything replaced. for VC we evolved our existing code base by, again, reversing function by function until we had everything done. Just not by dll injection this time.

[1] https://www.youtube.com/watch?v=22BeuOOERLo

I assume you have tested it and it doesn't work? Maybe the GPU is simply too old. I'm doing everything with shaders and it's possible they are just too much for this GPU. Supporting a wide range of hardware (especially old one that nobody has anymore), is not easy.