OpenBattlefield2: a clean-room Refractor 2 engine

The full story

OpenBattlefield2 is a clean-room reimplementation in C++20 of DICE's Refractor 2 engine, which ran Battlefield 2 (2005). It's an engine, not a game: it ships no content and runs from your own installed copy. The goal is a one-to-one port. Every rule in the code names where it came from: an address in the original binary (found with REA), a line in the game's data, or a measured frame of the original. Anything not yet understood is logged as "debt" rather than guessed.

It's an active research project, and the author is asking for help with the debt list, reference frame dumps and testing.