Excellent article! Just one thing surprised me:

> While I was writing a book about Wolfenstein 3D[1], I wanted to vividly demonstrate how much of a handicap it was to work without floating point

I would've expected fixed point to work fine for games, because that's a domain where you know the data, and in particular the dynamic range, in advance, so the 'automatically adjust to whatever dynamic range happens to be in the data' feature of floating point isn't needed. What am I missing? (If the answer is 'it would take too long to explain here, but he does actually explain it in the book', I'm prepared to accept that.)