The current Texas law is you can conceal a firearm in your car.
Concealed means can’t be seen.
I don’t understand the confusion.
In TX your car is considered part of your house. So you can have a concealed weapon ‘in your house’.
it took several legislative rewrites to get that dipsick Houston DA to quit charging people who were legally transporting their weapons.
I would say, however, that if a policeman is walking toward me, I would not reach for my gun and try to "make an adjustment". It is what it is -- don't spook the cop.