Tex. R. Civ. P. 324

As amended through January 22, 2020
Rule 324 - Prerequisites of Appeal
(a) Motion for New Trial Not Required. A point in a motion for new trial is not a prerequisite to a complaint on appeal in either a jury or a nonjury case, except as provided in subdivision (b).
(b) Motion for New Trial Required. A point in a motion for new trial is a prerequisite to the following complaints on appeal:
(1) A complaint on which evidence must be heard such as one of jury misconduct or newly discovered evidence or failure to set aside a judgment by default;
(2) A complaint of factual insufficiency of the evidence to support a jury finding;
(3) A complaint that a jury finding is against the overwhelming weight of the evidence;
(4) A complaint of inadequacy or excessiveness of the damages found by the jury; or
(5) Incurable jury argument if not otherwise ruled on by the trial court.
(c) Judgment Notwithstanding Findings; Cross-Points. When judgment is rendered non obstante verdicto or notwithstanding the findings of a jury on one or more questions, the appellee may bring forward by cross-point contained in his brief filed in the Court of Appeals any ground which would have vitiated the verdict or would have prevented an affirmance of the judgment had one been rendered by the trial court in harmony with the verdict, including although not limited to the ground that one or more of the jury's findings have insufficient support in the evidence or are against the overwhelming preponderance of the evidence as a matter of fact, and the ground that the verdict and judgment based thereon should be set aside because of improper argument of counsel.

The failure to bring forward by cross-points such grounds as would vitiate the verdict shall be deemed a waiver thereof; provided, however, that if a cross-point is upon a ground which requires the taking of evidence in addition to that adduced upon the trial of the cause, it is not necessary that the evidentiary hearing be held until after the appellate court determines that the cause be remanded to consider such a cross-point.

Tex. R. Civ. P. 324