I knew of Murnau, but I do agree Antonioni and Dreyer were both surprises.  You can probably go back to the early half of the past century and find handfuls of widely-recognized homosexuals.  One I just remembered from that time was German actor Conrad Veidt; and of course, there's always those conspiracy theories that Alfred Hitchcock was a closet homosexual (would perhaps explain his hatred for women...).  A side-comment.  A friend of mine told me Melanie Griffith was a horrid homophobe, yet she starred in John Waters' most recent film, and he's gay as the day is long.  I've always heard she was a pain to work with, and I guess Mr. Waters must have had extra trouble with her during the making of that film.  I'll just assume Ms. Griffith hasn't seen any of her husband Antonio's early Spanish films, especially the Almodóvar ones.