You’ve seen id Software’s classic DOOM game running on a Milky Way bar, now a programmer has created a functional calculator inside the title, and without using any mods. Danny Spencer didn’t build the adding machine in a level editor, as he wrote code in the programming language Clojure using Boolean algebra.
Since monsters can’t activate switches or remote-open doors in vanilla DOOM, he exploited a quirk in the Doom engine. How so? All doors are associated with a sector, and if one shares a sector with another, the two doors will always open and close together. Now monsters can’t open remote doors, but they can open local doors. This means that if the local door shares a sector with other doors, then monsters can remotely open doors. Download it here now.
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It can be difficult to imagine how monsters teleporting to places can represent addition. This is one of those problems that’s easier to understand in smaller pieces going bottom-up. We went from NAND, and then to binary decision diagrams,” said the programmer.
