random/dist/esm/generators/xor128.js

Seedable random number generator supporting many common distributions.

import RNG from '../rng';
export default class RNGXOR128 extends RNG {
    constructor(seed, opts) {
        super();
        this.x = 0;
        this.y = 0;
        this.z = 0;
        this.w = 0;
        this.seed(seed, opts);
    }
    get name() {
        return 'xor128';
    }
    next() {
        const t = this.x ^ (this.x << 1);
        this.x = this.y;
        this.y = this.z;
        this.z = this.w;
        this.w = this.w ^ ((this.w >>> 19) ^ t ^ (t >>> 8));
        return (this.w >>> 0) / 0x100000000;
    }
    seed(seed, opts) {
        this.x = this._seed(seed, opts);
        // discard an initial batch of 64 values
        for (let i = 0; i < 64; ++i) {
            this.next();
        }
    }
    clone(seed, opts) {
        return new RNGXOR128(seed, opts);
    }
}
//# sourceMappingURL=xor128.js.map