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Certain types of black powder guns are not considered firearms under either Texas or Federal law. According to Texas Penal Code Section 46.01, this is the definition of a firearm:
(3) "Firearm" means any device designed, made, or adapted to expel a projectile through a barrel by using the energy generated by an explosion or burning substance or any device readily convertible to that use. Firearm does not include a firearm that may have, as an integral part, a folding knife blade or other characteristics of weapons made illegal by this chapter and that is: (A) an antique or curio firearm manufactured before 1899; or (B) a replica of an antique or curio firearm manufactured before 1899, but only if the replica does not use rim fire or center fire ammunition.
So, in short, so long as your antique firearm was either manufactured befor 1899 or is a replica of one that was manufactured before 1899 AND if it does not use rim fire or center fire ammunition, it would be legal for you to own this and use it in Texas.
Just checking in to see if you need more help or any clarification of my answer. If so, please reply here on this question thread.