There are very few games that are exclusive to the PS3 now that unofficial PC ports are a thing. Games like God of War III, the Uncharted trilogy, their PS4 versions can all be played directly on PC. So I suggest you check out if the game is available on PS4 before you deal with rpcs3. Even if it doesn't have a port, it might be better to play the PS4 version on shadPS4 than playing it on rpcs3.