proc-seed

Shared deterministic PRNG/hash primitives and a reversible mixed-radix code codec for procedural content. The single source of truth for the seeding math used by zombie-field and its generator editors (tree-generator, rocks-generator), so a code curated in an editor reproduces the identical object in the game.

API

• mulberry32(seed) / makeRng(seed) — the project-wide deterministic PRNG.
• fnv1a32(text), lowbias32(h), hashString(text) — string → well-mixed uint32 seed.
• hash2(cx, cz, seed) — 2D spatial hash for streamed-world per-cell seeds.
• saltedSeed(base, index) / GOLDEN_GAMMA — decorrelated per-stream seed derivation.
• defineCodec(fields) — reversible mixed-radix base-62 object codes over a {key, min, max, step} ranges table. The table IS the codec grid: wire order = field order (first field most significant). Schema evolution: PREPEND new fields (old codes decode with them at their min); appending at the end, or changing any min/max/step, re-interprets every existing code.
• normalizeHash / formatHash / randomHash — Crockford base-32 map-hash string utilities (behavior frozen; curated hash lists depend on the normalization rules).

Byte-compatibility

test/golden.test.ts pins outputs captured from the original in-repo implementations. Do not change any algorithm here without accepting that every curated hash, cached asset fingerprint, and seeded world layout downstream will shift.