I think folks from outside the states will tend to say an accent is from Texas if it is from the South, now, Texas is mighty big, and the accents are way different in say Dallas, than on the la line, not to mention the northern parts of the state, so the Texas accent is a wide term...to say the least.
and when you go furhter east, the accents will differ even more from the Texas accent(s). In Alabama we tend to streeeeeetch out some of the words...espescially the last word of a sentence....you are my freeeeeeind....lol....and be mixing the the "i" and the "e" sound somewhat