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perlin noise

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alex 2022-04-16 10:03:00 +01:00
parent 544e32e0f8
commit f1ac9c4443
1 changed files with 13 additions and 0 deletions
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13
packages/core/signal.mjs
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@ -1,6 +1,7 @@
import { Hap } from './hap.mjs';
import { Pattern, fastcat, reify, silence } from './pattern.mjs';
import Fraction from './fraction.mjs';
import { id } from './util.mjs';
export function steady(value) {
// A continuous value
@ -29,6 +30,8 @@ export const square2 = square._toBipolar();
export const tri = fastcat(isaw, saw);
export const tri2 = fastcat(isaw2, saw2);
export const time = signal(id);
// random signals
const xorwise = (x) => {
@ -75,3 +78,13 @@ export const chooseWith = (pat, xs) => {
};
export const choose = (...xs) => chooseWith(rand, xs);
export const perlinWith = (pat) => {
const pata = pat.fmap(Math.floor);
const patb = pat.fmap((t) => Math.floor(t) + 1);
const smootherStep = (x) => 6.0 * x ** 5 - 15.0 * x ** 4 + 10.0 * x ** 3;
const interp = (x) => (a) => (b) => a + smootherStep(x) * (b - a);
return pat.sub(pata).fmap(interp).appBoth(pata.fmap(timeToRand)).appBoth(patb.fmap(timeToRand));
};
export const perlin = perlinWith(time);