The console UI's animated background was a port of the Apple client's LEGACY
fallback — four drifting radial blobs. Apple's shipping look is a 4×4
MeshGradient. Replace the blob field with an SkSL shader that reproduces it: a
smooth bicubic (separable cubic-Bézier) blend of the same 16 sRGB mesh colours,
the four interior control points driving a bounded (weight-normalised) domain
warp so the bright brand-violet pools drift while the frame edges stay pinned —
then the same ±8°/~5-min hue sway, elliptical vignette, and vertical legibility
scrim as the Swift composite(). Same [u_res, u_t] uniforms, so the draw path is
untouched beyond the rename (draw_aurora → draw_background, aurora → mesh).
Verified: the SkSL compiles on Skia's CPU frontend (unit test), and CPU-raster
renders at several time points show the dark-cornered field, the centred bright
pool, warm-left/cool-right temperature split, and the slow interior drift.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
enricobuehler
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