xfy de4ceee8ff refactor(shader): extract disk helpers, add DiskSample + flat fallback ...

Splits disk_color into shared helpers (temperature_color, radial_falloff,
apply_doppler, r_of) reused by both the flat and volumetric paths.
disk_color_flat returns a DiskSample with the old fixed 0.85 alpha,
preserving the exact pre-volumetric appearance behind the Off tier. A
temporary disk_color shim keeps the main-loop call site compiling until
Task 7 restructures it.

2026-07-15 13:29:48 +08:00

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shaders

refactor(shader): extract disk helpers, add DiskSample + flat fallback

2026-07-15 13:29:48 +08:00