One buffer, four contracts.

A deterministic WebGL2 lab keeps the official custom-attribute families separate: line displacement and color, particle size and color, merged billboard sorting, and alpha-tested billboard color.

The deterministic fixture preserves the attribute/shader/update contracts; official fonts, random fields, sprite files, Stats presentation, exact pixels, device matrices, and whole-example fidelity remain separate.

Pinned sources: lines · points · billboards · alpha-test billboards