He says he started off in assembly before he learned other languages. Presumably he uses some sort of disassembler (IDA Pro always used to be the big one) to m

He says he started off in assembly before he learned other languages. Presumably he uses some sort of disassembler (IDA Pro always used to be the big one) to make it a bit easier to figure out what’s going on. A lot of what he’s doing seems to be around looking at what direct-X commands are being sent and working up from there - I imagine there are ways to spy on these calls relatively easily with directx profilers, as well as the aforementioned disassembler showing you the calls. It’s very impressive work, and you’d need a good head for the APIs in use as well as understanding assembly language.