FieldProbe (raybench)

Offscreen GPU probe of ‖∇Φ‖ over a cubic lattice.

In the namespace raybench. Declared in src/libs/libraybench/raybench/FieldProbe.hpp.

Detailed description

Deliberately NOT part of Runner. Runner's numbers are pinned by a committed baseline (§RQ-IM-4), and widening its uniform block or its pipeline to serve a second shader shape would risk perturbing exactly the measurements the regression gate exists to protect. A hundred lines of duplicated QRhi boilerplate is the cheaper of the two prices.