We also built and shipped a deterministic multiplayer WebGL game[1], but using CoffeeScript[2] + C++ -> Emscripten/dylib/DLLs to run the game in the browser and

We also built and shipped a deterministic multiplayer WebGL game[1], but using CoffeeScript[2] + C++ -> Emscripten/dylib/DLLs to run the game in the browser and on Windows and Mac. Our game would snapshot the entire game state every few seconds and send that back to server to detect desyncs and cheaters. Floating point math, to our astonishment, was not the source of any non-determinism. I'm 80% sure that only source of non-determinism we encountered were from trig functions, so we just hard-coded lookup tables. 1: https://guardiansofatlas.com/ https://guardiansofatlas.com/ 2: It was 2012 when we started.