http://www.tpwd.state.tx.us/regulations/fish_hunt/general_law.phtmlPenal code covers it but Texas Parks and wildlife can and will enforce it . So yes it is a game law. if you cut into my high fence and shoot an axis you will loose your hunting license,game law , and be charged with trespassing , criminal, and then sued in court , civil.
Texas parks and wildlife can and does also deal with folks who are speeding, and drinking from glass bottles in state parks, so does that make those "game Laws" too?