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PermTable

polydat_nodes::noise

Struct PermTable 

Source 
pub struct PermTable {
    pub perm: [u8; 512],
}
Expand description

A permutation table for noise functions. Built from a seed at init time, immutable thereafter. The table is doubled (512 entries) to avoid modular indexing.

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§perm: [u8; 512]

The doubled table: 256 entries repeated, so an index needs no modulus.

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impl PermTable

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pub fn new(seed: u64) -> PermTable

The table a seed determines: a Fisher-Yates shuffle driven by xxh3.

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pub fn hash(&self, i: i32) -> u8

The entry at i modulo 256.

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