From bca7777fa507a509f413c6dc8919bab641fe0d15 Mon Sep 17 00:00:00 2001
From: Mark Raynsford <mark@io7m.com>
Date: Thu, 31 Oct 2013 01:07:48 +0000
Subject: Add functions for converting to and from binary16 half-precision
floating point values. Derived from http://mvn.io7m.com/ieee754b16, of which
I am the original author.
---
.../classes/com/jogamp/opengl/math/Binary32.java | 116 +++++++++++++++++++++
1 file changed, 116 insertions(+)
create mode 100644 src/jogl/classes/com/jogamp/opengl/math/Binary32.java
(limited to 'src/jogl/classes/com/jogamp/opengl/math/Binary32.java')
diff --git a/src/jogl/classes/com/jogamp/opengl/math/Binary32.java b/src/jogl/classes/com/jogamp/opengl/math/Binary32.java
new file mode 100644
index 000000000..d98815d9f
--- /dev/null
+++ b/src/jogl/classes/com/jogamp/opengl/math/Binary32.java
@@ -0,0 +1,116 @@
+/**
+ * Copyright 2013 JogAmp Community. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are
+ * permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this list of
+ * conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice, this list
+ * of conditions and the following disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY JogAmp Community ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JogAmp Community OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * The views and conclusions contained in the software and documentation are those of the
+ * authors and should not be interpreted as representing official policies, either expressed
+ * or implied, of JogAmp Community.
+ */
+
+package com.jogamp.opengl.math;
+
+/**
+ * Functions for interrogating <code>binary32</code> (float) values.
+ */
+
+public final class Binary32
+{
+ static final int NEGATIVE_ZERO_BITS;
+ static final int MASK_SIGN;
+ static final int MASK_EXPONENT;
+ static final int MASK_SIGNIFICAND;
+ static final int BIAS;
+
+ static {
+ NEGATIVE_ZERO_BITS = 0x80000000;
+ MASK_SIGN = 0x80000000;
+ MASK_EXPONENT = 0x7ff00000;
+ MASK_SIGNIFICAND = 0x7fffff;
+ BIAS = 127;
+ }
+
+ /**
+ * <p>
+ * Extract and unbias the exponent of the given packed <code>float</code>
+ * value.
+ * </p>
+ * <p>
+ * The exponent is encoded <i>biased</i> as a number in the range
+ * <code>[0, 255]</code>, with <code>0</code> indicating that the number is
+ * <i>subnormal</i> and <code>[1, 254]</code> denoting the actual exponent
+ * plus {@link #BIAS}. Infinite and <code>NaN</code> values always have a
+ * biased exponent of <code>255</code>.
+ * </p>
+ * <p>
+ * This function will therefore return:
+ * </p>
+ * <ul>
+ * <li>
+ * <code>0 - {@link #BIAS} = -127</code> iff the input is a <i>subnormal</i>
+ * number.</li>
+ * <li>An integer in the range
+ * <code>[1 - {@link #BIAS}, 254 - {@link #BIAS}] = [-126, 127]</code> iff
+ * the input is a <i>normal</i> number.</li>
+ * <li>
+ * <code>255 - {@link #BIAS} = 128</code> iff the input is
+ * {@link #POSITIVE_INFINITY}, {@link #NEGATIVE_INFINITY}, or
+ * <code>NaN</code>.</li>
+ * </ul>
+ *
+ * @see #packSetExponentUnbiasedUnchecked(int)
+ */
+
+ public static int unpackGetExponentUnbiased(
+ final float d)
+ {
+ final int b = Float.floatToRawIntBits(d);
+ final int em = b & Binary32.MASK_EXPONENT;
+ final int es = em >> 23;
+ return es - Binary32.BIAS;
+ }
+
+ /**
+ * <p>
+ * Return the sign of the given float value.
+ * </p>
+ */
+
+ public static int unpackGetSign(
+ final float d)
+ {
+ final int b = Float.floatToRawIntBits(d);
+ return ((b & Binary32.MASK_SIGN) >> 31) & 1;
+ }
+
+ /**
+ * <p>
+ * Return the significand of the given float value.
+ * </p>
+ */
+
+ public static int unpackGetSignificand(
+ final float d)
+ {
+ final int b = Float.floatToRawIntBits(d);
+ return b & Binary32.MASK_SIGNIFICAND;
+ }
+}
--
cgit v1.2.3