From dd05110e066757e72745dc5ec0bf7578a4ce3709 Mon Sep 17 00:00:00 2001
From: zzorn <zzorn@iki.fi>
Date: Fri, 6 May 2011 21:09:30 +0300
Subject: [PATCH] removing non-working xorshift

---
 .../scala/net/zzorn/utils/XorShiftRng.scala   | 101 ------------------
 1 file changed, 101 deletions(-)
 delete mode 100644 src/main/scala/net/zzorn/utils/XorShiftRng.scala

diff --git a/src/main/scala/net/zzorn/utils/XorShiftRng.scala b/src/main/scala/net/zzorn/utils/XorShiftRng.scala
deleted file mode 100644
index 2805636..0000000
--- a/src/main/scala/net/zzorn/utils/XorShiftRng.scala
+++ /dev/null
@@ -1,101 +0,0 @@
-package net.zzorn.utils
-
-object XorShiftRng {
-  private val defaultSeed1: Int = 123456789
-  private val defaultSeed2: Int = 362436069
-  private val defaultSeed3: Int = 521288629
-  private val defaultSeed4: Int = 88675123
-}
-
-/**
- * 
- */
-// TODO: Broken, fix.  Not in use atm.
-class XorShiftRng {
-
-  private var x = XorShiftRng.defaultSeed1
-  private var y = XorShiftRng.defaultSeed2
-  private var z = XorShiftRng.defaultSeed3
-  private var w = XorShiftRng.defaultSeed4
-
-  private var _haveNextGaussian = false
-  private var _nextGaussian = 0.0
-
-  def this(seed1: Int,
-           seed2: Int = XorShiftRng.defaultSeed2,
-           seed3: Int = XorShiftRng.defaultSeed3,
-           seed4: Int = XorShiftRng.defaultSeed4) {
-    this()
-    seed(seed1, seed2, seed3, seed4)
-  }
-
-  def seed(seed1: Int = XorShiftRng.defaultSeed1,
-           seed2: Int = XorShiftRng.defaultSeed2,
-           seed3: Int = XorShiftRng.defaultSeed3,
-           seed4: Int = XorShiftRng.defaultSeed4) {
-
-    x = if (seed1 == 0) XorShiftRng.defaultSeed1 else seed1
-    y = if (seed2 == 0) XorShiftRng.defaultSeed2 else seed2
-    z = if (seed3 == 0) XorShiftRng.defaultSeed3 else seed3
-    w = if (seed4 == 0) XorShiftRng.defaultSeed4 else seed4
-
-    // Cycle in seed values
-    nextInt
-    nextInt
-    nextInt
-    nextInt
-    nextInt
-    nextInt
-  }
-
-  def nextInt: Int = {
-    val t = x ^ (x << 11)
-    x = y; y = z; z = w;
-    w = w ^ (w >> 19) ^ (t ^ (t >> 8))
-    w
-  }
-
-  def nextInt(max: Int): Int = {
-    // TODO: Naive implementation, not good for large values.  Fix.
-    math.abs(nextInt) % max
-  }
-
-  def nextFloat: Float = {
-    // TODO: Naive implementation.  Fix.
-    nextDouble.toFloat
-  }
-
-  def nextGaussianF: Float = nextGaussian.toFloat
-
-  def nextGaussian: Double = {
-    if (_haveNextGaussian) {
-      _haveNextGaussian = false
-      _nextGaussian
-    }
-    else {
-      var t  = 0.0
-      var v1 = 0.0
-      var v2 = 0.0
-      do {
-        v1 = 2.0 * nextDouble - 1.0
-        v2 = 2.0 * nextDouble - 1.0
-        t = v1 * v1 + v2 * v2;
-      } while (t >= 1 || t==0 )
-
-      val multiplier = math.sqrt(-2.0 * math.log(t) / t)
-
-      _nextGaussian = v2 * multiplier
-      _haveNextGaussian = true
-
-      v1 * multiplier
-    }
-  }
-
-  def nextDouble: Double = {
-    val a: Long = (nextInt.toLong & 0xffffffffL) >>> 5
-    val b: Long = (nextInt.toLong & 0xffffffffL) >>> 6
-    (a * 67108864.0 + b) / 9007199254740992.0
-  }
-
-
-}
\ No newline at end of file