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Rex B: Here's the skinny, as far as I can tell:

§ 38.03. RESISTING ARREST, SEARCH, OR TRANSPORTATION. (a) A person commits an offense if he intentionally prevents or obstructs a person he knows is a peace officer or a person acting in a peace officer's presence and at his direction from effecting an arrest, search, or transportation of the actor or another by using force against the peace officer or another.

There' s no way that getting out of your car meets that standard, but it will probably be the DA or judge who decides, after you are arrested.

§ 38.15. INTERFERENCE WITH PUBLIC DUTIES. (a) A person commits an offense if the person with criminal negligence interrupts, disrupts, impedes, or otherwise interferes with:
(1) a peace officer while the peace officer is performing a duty or exercising authority imposed or granted by law;

This one could easily earn you a ride.

AFAICT, no law specifically requires you to do exactly what a LEO says; but there's no law against spitting into the wind, either.

I am still not a lawyer.

- Jim

Rex B wrote:... I've wondered then and now whether he had the legal right to confine me to my car, on my own private property.

I don't know if anyone can point to a specific law that requires you to follow the instructions of a LEO in that regard, but the practical consequences of not doing so are obvious.

- Jim