Separate data from tint.

The customColor attribute stores per-particle color while a global color uniform tints the whole field. The dynamic size buffer still owns its own upload invalidation.

backend

WebGL2

particles

—

attributes

—

material

—

sprite

—

frames

—

sample avg / p95

NOT RUN

Official random generation, Stats panel, exact page/pixel fidelity, shader compiler/device matrix, driver upload inspection, device-wide performance, native WebGPU parity, context-loss stress, exact official spark1.png asset, and whole-example fidelity remain separate.