TOKYO — Violence pulsates in Shinya Tsukamoto’s early films, driving stories into nightmarish fantasies like in the award-winning 1989 “Tetsuo,” which ridicules middle-class conformity with a man-becomes-machine metamorphosis. His more recent works still depict violence, though the Japanese director says the nature of the violence has changed — from whimsical “cyberpunk” horror to horrifying reality.