1 files changed, 68 insertions, 0 deletions
diff --git a/src/main/java/org/jogamp/vecmath/VecMathUtil.java b/src/main/java/org/jogamp/vecmath/VecMathUtil.java
new file mode 100644
index 0000000..49b125a
--- /dev/null
+++ b/src/main/java/org/jogamp/vecmath/VecMathUtil.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright 2004-2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+package org.jogamp.vecmath;
+
+/**
+ * Utility vecmath class used when computing the hash code for vecmath
+ * objects containing float or double values. This fixes Issue 36.
+ */
+class VecMathUtil {
+/**
+ * Do not construct an instance of this class.
+ */
+private VecMathUtil() {}
+
+	static final long hashLongBits(long hash, long l) {
+		hash *= 31L;
+		return hash + l;
+	}
+
+	static final long hashFloatBits(long hash, float f) {
+		hash *= 31L;
+		// Treat 0.0d and -0.0d the same (all zero bits)
+		if (f == 0.0f)
+			return hash;
+
+		return hash + Float.floatToIntBits(f);
+	}
+
+	static final long hashDoubleBits(long hash, double d) {
+		hash *= 31L;
+		// Treat 0.0d and -0.0d the same (all zero bits)
+		if (d == 0.0d)
+			return hash;
+
+		return hash + Double.doubleToLongBits(d);
+	}
+
+	/**
+	 * Return an integer hash from a long by mixing it with itself.
+	 */
+	static final int hashFinish(long hash) {
+		return (int)(hash ^ (hash >> 32));
+	}
+}