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/Binary16.java | 569 +++++++++++++++++++++
.../classes/com/jogamp/opengl/math/Binary32.java | 116 +++++
.../classes/com/jogamp/opengl/math/Binary64.java | 116 +++++
3 files changed, 801 insertions(+)
create mode 100644 src/jogl/classes/com/jogamp/opengl/math/Binary16.java
create mode 100644 src/jogl/classes/com/jogamp/opengl/math/Binary32.java
create mode 100644 src/jogl/classes/com/jogamp/opengl/math/Binary64.java
(limited to 'src/jogl/classes/com/jogamp')
diff --git a/src/jogl/classes/com/jogamp/opengl/math/Binary16.java b/src/jogl/classes/com/jogamp/opengl/math/Binary16.java
new file mode 100644
index 000000000..33add46c2
--- /dev/null
+++ b/src/jogl/classes/com/jogamp/opengl/math/Binary16.java
@@ -0,0 +1,569 @@
+/**
+ * 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;
+
+/**
+ * <p>
+ * Functions to convert values to/from the <code>binary16</code> format
+ * specified in <code>IEEE 754 2008</code>.
+ * </p>
+ */
+
+public final class Binary16
+{
+ /**
+ * The encoded form of negative infinity <code>-∞</code>.
+ */
+
+ public static final char NEGATIVE_INFINITY;
+
+ /**
+ * The encoded form of positive infinity <code>∞</code>.
+ */
+
+ public static final char POSITIVE_INFINITY;
+
+ /**
+ * The encoded form of positive zero <code>0</code>.
+ */
+
+ public static final char POSITIVE_ZERO;
+
+ /**
+ * The encoded form of negative zero <code>-0</code>.
+ */
+
+ public static final char NEGATIVE_ZERO;
+
+ /**
+ * The <i>bias</i> value used to offset the encoded exponent. A given
+ * exponent <code>e</code> is encoded as <code>{@link #BIAS} + e</code>.
+ */
+
+ public static final int BIAS;
+
+ static {
+ NEGATIVE_INFINITY = 0xFC00;
+ POSITIVE_INFINITY = 0x7C00;
+ POSITIVE_ZERO = 0x0000;
+ NEGATIVE_ZERO = 0x8000;
+ BIAS = 15;
+ }
+
+ private static final int MASK_SIGN;
+ private static final int MASK_EXPONENT;
+ private static final int MASK_SIGNIFICAND;
+
+ static {
+ MASK_SIGN = 0x8000;
+ MASK_EXPONENT = 0x7C00;
+ MASK_SIGNIFICAND = 0x03FF;
+ }
+
+ /**
+ * One possible not-a-number value.
+ */
+
+ public static char exampleNaN()
+ {
+ final int n =
+ Binary16.packSetExponentUnbiasedUnchecked(16)
+ | Binary16.packSetSignificandUnchecked(1);
+ final char c = (char) n;
+ return c;
+ }
+
+ /**
+ * Return <code>true</code> if the given packed <code>binary16</code> value
+ * is infinite.
+ */
+
+ public static boolean isInfinite(
+ final char k)
+ {
+ if (Binary16.unpackGetExponentUnbiased(k) == 16) {
+ if (Binary16.unpackGetSignificand(k) == 0) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ /**
+ * Return <code>true</code> if the given packed <code>binary16</code> value
+ * is not a number (<code>NaN</code>).
+ */
+
+ public static boolean isNaN(
+ final char k)
+ {
+ final int e = Binary16.unpackGetExponentUnbiased(k);
+ final int s = Binary16.unpackGetSignificand(k);
+ return (e == 16) && (s > 0);
+ }
+
+ /**
+ * <p>
+ * Convert a double precision floating point value to a packed
+ * <code>binary16</code> value.
+ * </p>
+ * <p>
+ * For the following specific cases, the function returns:
+ * </p>
+ * <ul>
+ * <li><code>NaN</code> iff <code>isNaN(k)</code></li>
+ * <li>{@link #POSITIVE_INFINITY} iff
+ * <code>k == {@link Double#POSITIVE_INFINITY}</code></li>
+ * <li>{@link #NEGATIVE_INFINITY} iff
+ * <code>k == {@link Double#NEGATIVE_INFINITY}</code></li>
+ * <li>{@link #NEGATIVE_ZERO} iff <code>k == -0.0</code></li>
+ * <li>{@link #POSITIVE_ZERO} iff <code>k == 0.0</code></li>
+ * </ul>
+ * <p>
+ * Otherwise, the <code>binary16</code> value that most closely represents
+ * <code>k</code> is returned. This may obviously be an infinite value as
+ * the interval of double precision values is far larger than that of the
+ * <code>binary16</code> type.
+ * </p>
+ *
+ * @see #unpackDouble(char)
+ */
+
+ public static char packDouble(
+ final double k)
+ {
+ if (Double.isNaN(k)) {
+ return Binary16.exampleNaN();
+ }
+ if (k == Double.POSITIVE_INFINITY) {
+ return Binary16.POSITIVE_INFINITY;
+ }
+ if (k == Double.NEGATIVE_INFINITY) {
+ return Binary16.NEGATIVE_INFINITY;
+ }
+ if (Double.doubleToLongBits(k) == Binary64.NEGATIVE_ZERO_BITS) {
+ return Binary16.NEGATIVE_ZERO;
+ }
+ if (k == 0.0) {
+ return Binary16.POSITIVE_ZERO;
+ }
+
+ final long de = Binary64.unpackGetExponentUnbiased(k);
+ final long ds = Binary64.unpackGetSign(k);
+ final long dn = Binary64.unpackGetSignificand(k);
+ final char rsr = Binary16.packSetSignUnchecked((int) ds);
+
+ /**
+ * Extract the 5 least-significant bits of the exponent.
+ */
+
+ final int rem = (int) (de & 0x001F);
+ final char rer = Binary16.packSetExponentUnbiasedUnchecked(rem);
+
+ /**
+ * Extract the 10 most-significant bits of the significand.
+ */
+
+ final long rnm = dn & 0xFFC0000000000L;
+ final long rns = rnm >> 42;
+ final char rnr = Binary16.packSetSignificandUnchecked((int) rns);
+
+ /**
+ * Combine the results.
+ */
+
+ return (char) (rsr | rer | rnr);
+ }
+
+ /**
+ * <p>
+ * Convert a single precision floating point value to a packed
+ * <code>binary16</code> value.
+ * </p>
+ * <p>
+ * For the following specific cases, the function returns:
+ * </p>
+ * <ul>
+ * <li><code>NaN</code> iff <code>isNaN(k)</code></li>
+ * <li>{@link #POSITIVE_INFINITY} iff
+ * <code>k == {@link Float#POSITIVE_INFINITY}</code></li>
+ * <li>{@link #NEGATIVE_INFINITY} iff
+ * <code>k == {@link Float#NEGATIVE_INFINITY}</code></li>
+ * <li>{@link #NEGATIVE_ZERO} iff <code>k == -0.0</code></li>
+ * <li>{@link #POSITIVE_ZERO} iff <code>k == 0.0</code></li>
+ * </ul>
+ * <p>
+ * Otherwise, the <code>binary16</code> value that most closely represents
+ * <code>k</code> is returned. This may obviously be an infinite value as
+ * the interval of single precision values is far larger than that of the
+ * <code>binary16</code> type.
+ * </p>
+ *
+ * @see #unpackFloat(char)
+ */
+
+ public static char packFloat(
+ final float k)
+ {
+ if (Float.isNaN(k)) {
+ return Binary16.exampleNaN();
+ }
+ if (k == Float.POSITIVE_INFINITY) {
+ return Binary16.POSITIVE_INFINITY;
+ }
+ if (k == Float.NEGATIVE_INFINITY) {
+ return Binary16.NEGATIVE_INFINITY;
+ }
+ if (Float.floatToIntBits(k) == Binary32.NEGATIVE_ZERO_BITS) {
+ return Binary16.NEGATIVE_ZERO;
+ }
+ if (k == 0.0) {
+ return Binary16.POSITIVE_ZERO;
+ }
+
+ final long de = Binary32.unpackGetExponentUnbiased(k);
+ final long ds = Binary32.unpackGetSign(k);
+ final long dn = Binary32.unpackGetSignificand(k);
+ final char rsr = Binary16.packSetSignUnchecked((int) ds);
+
+ /**
+ * Extract the 5 least-significant bits of the exponent.
+ */
+
+ final int rem = (int) (de & 0x001F);
+ final char rer = Binary16.packSetExponentUnbiasedUnchecked(rem);
+
+ /**
+ * Extract the 10 most-significant bits of the significand.
+ */
+
+ final long rnm = dn & 0x7FE000L;
+ final long rns = rnm >> 13;
+ final char rnr = Binary16.packSetSignificandUnchecked((int) rns);
+
+ /**
+ * Combine the results.
+ */
+
+ return (char) (rsr | rer | rnr);
+ }
+
+ /**
+ * <p>
+ * Encode the unbiased exponent <code>e</code>. Values should be in the
+ * range <code>[-15, 16]</code> - values outside of this range will be
+ * truncated.
+ * </p>
+ *
+ * @see #unpackGetExponentUnbiased(char)
+ */
+
+ public static char packSetExponentUnbiasedUnchecked(
+ final int e)
+ {
+ final int eb = e + Binary16.BIAS;
+ final int es = eb << 10;
+ final int em = es & Binary16.MASK_EXPONENT;
+ return (char) em;
+ }
+
+ /**
+ * <p>
+ * Encode the significand <code>s</code>. Values should be in the range
+ * <code>[0, 1023]</code>. Values outside of this range will be truncated.
+ * </p>
+ *
+ * @see #unpackGetSignificand(char)
+ */
+
+ public static char packSetSignificandUnchecked(
+ final int s)
+ {
+ final int sm = s & Binary16.MASK_SIGNIFICAND;
+ return (char) sm;
+ }
+
+ /**
+ * <p>
+ * Encode the sign bit <code>s</code>. Values should be in the range
+ * <code>[0, 1]</code>, with <code>0</code> ironically denoting a positive
+ * value. Values outside of this range will be truncated.
+ * </p>
+ *
+ * @see #unpackGetSign(char)
+ */
+
+ public static char packSetSignUnchecked(
+ final int s)
+ {
+ final int ss = s << 15;
+ final int sm = ss & Binary16.MASK_SIGN;
+ return (char) sm;
+ }
+
+ /**
+ * Show the given raw packed <code>binary16</code> value as a string of
+ * binary digits.
+ */
+
+ public static String toRawBinaryString(
+ final char k)
+ {
+ final StringBuilder b = new StringBuilder();
+ int z = k;
+ for (int i = 0; i < 16; ++i) {
+ if ((z & 1) == 1) {
+ b.insert(0, "1");
+ } else {
+ b.insert(0, "0");
+ }
+ z >>= 1;
+ }
+ return b.toString();
+ }
+
+ /**
+ * <p>
+ * Convert a packed <code>binary16</code> value <code>k</code> to a
+ * double-precision floating point value.
+ * </p>
+ * <p>
+ * The function returns:
+ * </p>
+ * <ul>
+ * <li><code>NaN</code> iff <code>isNaN(k)</code></li>
+ * <li>{@link Double#POSITIVE_INFINITY} iff
+ * <code>k == {@link #POSITIVE_INFINITY}</code></li>
+ * <li>{@link Double#NEGATIVE_INFINITY} iff
+ * <code>k == {@link #NEGATIVE_INFINITY}</code></li>
+ * <li><code>-0.0</code> iff <code>k == {@link #NEGATIVE_ZERO}</code></li>
+ * <li><code>0.0</code> iff <code>k == {@link #POSITIVE_ZERO}</code></li>
+ * <li><code>(-1.0 * n) * (2 ^ e) * 1.s</code>, for the decoded sign
+ * <code>n</code> of <code>k</code>, the decoded exponent <code>e</code> of
+ * <code>k</code>, and the decoded significand <code>s</code> of
+ * <code>k</code>.</li>
+ * </ul>
+ *
+ * @see #packDouble(double)
+ */
+
+ public static double unpackDouble(
+ final char k)
+ {
+ if (Binary16.isNaN(k)) {
+ return Double.NaN;
+ }
+ if (k == Binary16.POSITIVE_INFINITY) {
+ return Double.POSITIVE_INFINITY;
+ }
+ if (k == Binary16.NEGATIVE_INFINITY) {
+ return Double.NEGATIVE_INFINITY;
+ }
+ if (k == Binary16.NEGATIVE_ZERO) {
+ return -0.0;
+ }
+ if (k == Binary16.POSITIVE_ZERO) {
+ return 0.0;
+ }
+
+ final long e = Binary16.unpackGetExponentUnbiased(k);
+ final long s = Binary16.unpackGetSign(k);
+ final long n = Binary16.unpackGetSignificand(k);
+
+ /**
+ * Shift the sign bit to the position at which it will appear in the
+ * resulting value.
+ */
+
+ final long rsr = s << 63;
+
+ /**
+ * 1. Bias the exponent.
+ *
+ * 2. Shift the result left to the position at which it will appear in the
+ * resulting value.
+ */
+
+ final long reb = (e + Binary64.BIAS);
+ final long rer = reb << 52;
+
+ /**
+ * Shift the significand left to the position at which it will appear in
+ * the resulting value.
+ */
+
+ final long rnr = n << 42;
+ return Double.longBitsToDouble(rsr | rer | rnr);
+ }
+
+ /**
+ * <p>
+ * Convert a packed <code>binary16</code> value <code>k</code> to a
+ * single-precision floating point value.
+ * </p>
+ * <p>
+ * The function returns:
+ * </p>
+ * <ul>
+ * <li><code>NaN</code> iff <code>isNaN(k)</code></li>
+ * <li>{@link Float#POSITIVE_INFINITY} iff
+ * <code>k == {@link #POSITIVE_INFINITY}</code></li>
+ * <li>{@link Float#NEGATIVE_INFINITY} iff
+ * <code>k == {@link #NEGATIVE_INFINITY}</code></li>
+ * <li><code>-0.0</code> iff <code>k == {@link #NEGATIVE_ZERO}</code></li>
+ * <li><code>0.0</code> iff <code>k == {@link #POSITIVE_ZERO}</code></li>
+ * <li><code>(-1.0 * n) * (2 ^ e) * 1.s</code>, for the decoded sign
+ * <code>n</code> of <code>k</code>, the decoded exponent <code>e</code> of
+ * <code>k</code>, and the decoded significand <code>s</code> of
+ * <code>k</code>.</li>
+ * </ul>
+ *
+ * @see #packFloat(float)
+ */
+
+ public static float unpackFloat(
+ final char k)
+ {
+ if (Binary16.isNaN(k)) {
+ return Float.NaN;
+ }
+ if (k == Binary16.POSITIVE_INFINITY) {
+ return Float.POSITIVE_INFINITY;
+ }
+ if (k == Binary16.NEGATIVE_INFINITY) {
+ return Float.NEGATIVE_INFINITY;
+ }
+ if (k == Binary16.NEGATIVE_ZERO) {
+ return -0.0f;
+ }
+ if (k == Binary16.POSITIVE_ZERO) {
+ return 0.0f;
+ }
+
+ final int e = Binary16.unpackGetExponentUnbiased(k);
+ final int s = Binary16.unpackGetSign(k);
+ final int n = Binary16.unpackGetSignificand(k);
+
+ /**
+ * Shift the sign bit to the position at which it will appear in the
+ * resulting value.
+ */
+
+ final int rsr = s << 31;
+
+ /**
+ * 1. Bias the exponent.
+ *
+ * 2. Shift the result left to the position at which it will appear in the
+ * resulting value.
+ */
+
+ final int reb = (e + Binary32.BIAS);
+ final int rer = reb << 23;
+
+ /**
+ * Shift the significand left to the position at which it will appear in
+ * the resulting value.
+ */
+
+ final int rnr = n << 13;
+ return Float.intBitsToFloat(rsr | rer | rnr);
+ }
+
+ /**
+ * <p>
+ * Extract and unbias the exponent of the given packed <code>binary16</code>
+ * value.
+ * </p>
+ * <p>
+ * The exponent is encoded <i>biased</i> as a number in the range
+ * <code>[0, 31]</code>, with <code>0</code> indicating that the number is
+ * <i>subnormal</i> and <code>[1, 30]</code> denoting the actual exponent
+ * plus {@link #BIAS}. Infinite and <code>NaN</code> values always have an
+ * exponent of <code>31</code>.
+ * </p>
+ * <p>
+ * This function will therefore return:
+ * </p>
+ * <ul>
+ * <li>
+ * <code>0 - {@link #BIAS} = -15</code> iff the input is a <i>subnormal</i>
+ * number.</li>
+ * <li>An integer in the range
+ * <code>[1 - {@link #BIAS}, 30 - {@link #BIAS}] = [-14, 15]</code> iff the
+ * input is a <i>normal</i> number.</li>
+ * <li>
+ * <code>16</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 char k)
+ {
+ final int em = k & Binary16.MASK_EXPONENT;
+ final int es = em >> 10;
+ return es - Binary16.BIAS;
+ }
+
+ /**
+ * Retrieve the sign bit of the given packed <code>binary16</code> value, as
+ * an integer in the range <code>[0, 1]</code>.
+ *
+ * @see Binary16#packSetSignUnchecked(int)
+ */
+
+ public static int unpackGetSign(
+ final char k)
+ {
+ return (k & Binary16.MASK_SIGN) >> 15;
+ }
+
+ /**
+ * <p>
+ * Return the significand of the given packed <code>binary16</code> value as
+ * an integer in the range <code>[0, 1023]</code>.
+ * </p>
+ *
+ * @see Binary16#packSetSignificandUnchecked(int)
+ */
+
+ public static int unpackGetSignificand(
+ final char k)
+ {
+ return k & Binary16.MASK_SIGNIFICAND;
+ }
+
+ private Binary16()
+ {
+ throw new AssertionError("Unreachable code, report this bug!");
+ }
+}
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;
+ }
+}
diff --git a/src/jogl/classes/com/jogamp/opengl/math/Binary64.java b/src/jogl/classes/com/jogamp/opengl/math/Binary64.java
new file mode 100644
index 000000000..5efad433a
--- /dev/null
+++ b/src/jogl/classes/com/jogamp/opengl/math/Binary64.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>binary64</code> (double) values.
+ */
+
+public final class Binary64
+{
+ static final long NEGATIVE_ZERO_BITS;
+ static final long MASK_SIGN;
+ static final long MASK_EXPONENT;
+ static final long MASK_SIGNIFICAND;
+ static final long BIAS;
+
+ static {
+ NEGATIVE_ZERO_BITS = 0x8000000000000000L;
+ MASK_SIGN = 0x8000000000000000L;
+ MASK_EXPONENT = 0x7ff0000000000000L;
+ MASK_SIGNIFICAND = 0x000fffffffffffffL;
+ BIAS = 1023;
+ }
+
+ /**
+ * <p>
+ * Extract and unbias the exponent of the given packed <code>double</code>
+ * value.
+ * </p>
+ * <p>
+ * The exponent is encoded <i>biased</i> as a number in the range
+ * <code>[0, 2047]</code>, with <code>0</code> indicating that the number is
+ * <i>subnormal</i> and <code>[1, 2046]</code> denoting the actual exponent
+ * plus {@link #BIAS}. Infinite and <code>NaN</code> values always have a
+ * biased exponent of <code>2047</code>.
+ * </p>
+ * <p>
+ * This function will therefore return:
+ * </p>
+ * <ul>
+ * <li>
+ * <code>0 - {@link #BIAS} = -1023</code> iff the input is a
+ * <i>subnormal</i> number.</li>
+ * <li>An integer in the range
+ * <code>[1 - {@link #BIAS}, 2046 - {@link #BIAS}] = [-1022, 1023]</code>
+ * iff the input is a <i>normal</i> number.</li>
+ * <li>
+ * <code>2047 - {@link #BIAS} = 1024</code> iff the input is
+ * {@link #POSITIVE_INFINITY}, {@link #NEGATIVE_INFINITY}, or
+ * <code>NaN</code>.</li>
+ * </ul>
+ *
+ * @see #packSetExponentUnbiasedUnchecked(int)
+ */
+
+ public static long unpackGetExponentUnbiased(
+ final double d)
+ {
+ final long b = Double.doubleToRawLongBits(d);
+ final long em = b & Binary64.MASK_EXPONENT;
+ final long es = em >> 52;
+ return es - Binary64.BIAS;
+ }
+
+ /**
+ * <p>
+ * Return the significand of the given double value.
+ * </p>
+ */
+
+ public static long unpackGetSignificand(
+ final double d)
+ {
+ final long b = Double.doubleToRawLongBits(d);
+ return b & Binary64.MASK_SIGNIFICAND;
+ }
+
+ /**
+ * <p>
+ * Return the sign of the given double value.
+ * </p>
+ */
+
+ public static long unpackGetSign(
+ final double d)
+ {
+ final long b = Double.doubleToRawLongBits(d);
+ return ((b & Binary64.MASK_SIGN) >> 63) & 1;
+ }
+}
--
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