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2.3 KiB
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36 lines
No EOL
2.3 KiB
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<title>Hash.mix — Ludic</title>
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<meta name="description" content="Avalanche one integer into a well-scrambled value.">
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<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>
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<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.mix</span></div>
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<div class="item-head">
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<span class="kind-badge kind-method">method</span>
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<h1 id="top">Hash.mix</h1>
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</div>
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<code class="sig">Hash.mix(x) -> int</code>
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<div class="desc"><p>Scrambles a single integer so its bits are thoroughly mixed — the <a href="https://en.wikipedia.org/wiki/MurmurHash">MurmurHash3</a> <code>fmix32</code> finalizer (shift/multiply/shift). Nearby inputs like <code>0</code>, <code>1</code>, <code>2</code> map to values that look unrelated, which is exactly what you want when turning a counter, entity id, or frame number into a random-looking seed. It is deterministic and self-inverse-free: the same input always gives the same output. <code>Hash.mix(0)</code> is <code>0</code>. For folding several numbers together use <a href="hash-combine"><code>Hash.combine</code></a>.</p></div>
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<div class="params"><h2>Parameters</h2><div class="param" id="param-x"><code class="pname">x</code><span class="pdesc">the integer to avalanche</span></div></div>
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<div class="examples"><h2>Example</h2><pre data-lang="ludic">program Seeds {
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entry {
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var i = 0
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while i < 4 {
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print(Hash.mix(i)) # consecutive counters -> unrelated-looking seeds
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i = i + 1
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}
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}
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}</pre></div>
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<script>Ludic.highlightAll(); Ludic.installCards(); Ludic.flashTarget();</script>
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