37 lines
No EOL
2.3 KiB
HTML
37 lines
No EOL
2.3 KiB
HTML
<!doctype html>
|
||
<html lang="en">
|
||
<head>
|
||
<meta charset="utf-8">
|
||
<meta name="viewport" content="width=device-width, initial-scale=1">
|
||
<title>Hash.combine — Ludic</title>
|
||
<meta name="description" content="Fold several ints into one deterministic seed.">
|
||
<link rel="stylesheet" href="base.css">
|
||
<link rel="stylesheet" href="docs.css">
|
||
</head>
|
||
<body>
|
||
<header class="nav"><div class="wrap nav-in"><a class="brand" href="index.html"><span class="logo">L</span> Ludic</a><button class="nav-toggle" aria-label="Toggle menu" aria-expanded="false">☰</button><nav class="nav-links"><a href="index.html">Home</a><a href="api.html">API Reference</a><a class="nav-cta" href="https://git.workshopsoft.io/workshopsoft/ludic">Source ↗</a></nav></div></header>
|
||
<main class="wrap item">
|
||
<div class="crumbs"><a href="api.html">API Reference</a> <span>›</span> <a href="ns-hash.html">Hash</a> <span>›</span> <span class="here">Hash.combine</span></div>
|
||
<div class="item-head">
|
||
<span class="kind-badge kind-method">method</span>
|
||
<h1 id="top">Hash.combine</h1>
|
||
</div>
|
||
<code class="sig">Hash.combine(...) -> int</code>
|
||
<div class="desc"><p>Mixes any number of integers into a single 32-bit value. It folds the arguments left to right with the classic hash-combine step (each value is spread with the golden-ratio constant <code>0x9e3779b9</code> and stirred into the running seed), so the result depends on every input and on their order — <code>Hash.combine(1, 2, 3)</code> and <code>Hash.combine(3, 2, 1)</code> differ. The whole point is a per-thing deterministic seed: hash a world seed with a chunk's coordinates to drive procedural generation, so the same chunk always regenerates identically. Pair it with the noise and random libraries, which take a seed.</p></div>
|
||
|
||
<div class="examples"><h2>Example</h2><pre data-lang="ludic">program ChunkSeed {
|
||
entry {
|
||
let world_seed = 1337
|
||
let cx = 4
|
||
let cy = -2
|
||
let seed = Hash.combine(world_seed, cx, cy) # this chunk's stable seed
|
||
print(seed)
|
||
print(Hash.combine(world_seed, cx, cy) == seed) # 1 — reproducible
|
||
}
|
||
}</pre></div>
|
||
|
||
<a class="back" href="api.html">← All symbols</a>
|
||
</main>
|
||
<script src="ludic-highlight.js"></script>
|
||
<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
|
||
</body></html> |