Xorshift による疑似乱数生成

xor128.js

// xor128 class
var xor128 = {
  // member
	x: 123456789,
	y: 362436069,
	z: 521288629,
	w: 88675123,

	// method
	setSeed: function(seed){
		this.w = seed;
	},

	generate: function(){
		var t  = this.x ^ (this.x << 11);
		this.x = this.y;
		this.y = this.z;
		this.z = this.w;
		this.w = (this.w ^ (this.w >>> 19) ^ (t ^ (t >>> 8))) >>> 0;

		return this.w;
	}
};