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| /* ============================================================ | |
| The sim's one sanctioned source of randomness: a small, fast, seedable | |
| PRNG. Passing a mulberry32(seed) into createGameState makes a whole match | |
| reproducible from that one number — the foundation for shareable map seeds | |
| today and replays/netcode later. The engine uses NO other randomness (a | |
| determinism-guard test enforces it), so "same seed ⇒ same game". | |
| ============================================================ */ | |
| ; | |
| // A tiny deterministic string hash (the classic h=7, h*31+c), used across the sim for stable | |
| // per-id / per-pair tie-breaks — a worker's orbit angle, an avoidance dodge direction, a | |
| // spread-fire target pick. It lived, byte-identical, in four separate modules; centralised here | |
| // (the natural home for deterministic number sources) so a change can't drift between copies. | |
| // All ids are ASCII, so this is exact; >>> 0 keeps it an unsigned 32-bit int. | |
| export function hashStr(s) { | |
| let h = 7; | |
| for (let i = 0; i < s.length; i++) h = (h * 31 + s.charCodeAt(i)) >>> 0; | |
| return h; | |
| } | |
| // mulberry32: 32-bit state, good distribution, identical output across JS | |
| // engines for the same seed. Returns a function producing floats in [0, 1). | |
| export function mulberry32(seed) { | |
| let a = seed >>> 0; | |
| return function () { | |
| a |= 0; | |
| a = (a + 0x6d2b79f5) | 0; | |
| let t = Math.imul(a ^ (a >>> 15), 1 | a); | |
| t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t; | |
| return ((t ^ (t >>> 14)) >>> 0) / 4294967296; | |
| }; | |
| } | |