From 5d6e8a367c03644740187e500c6de5d3ac039d5e Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Wed, 20 Sep 2023 19:51:55 +0200
Subject: Bug 1452 - Decouple math functionality to 'com.jogamp.math' to be
 toolkit agnostic (PMVMatrix, Matrix4f, Vec4f, ..)

Math functionality (PMVMatrix, Matrix4f, Vec4f, ..)
- shall be used toolkit agnostic, e.g. independent from OpenGL
- shall be reused within our upcoming Vulkan implementation
- may also move outside of JOGL, i.e. GlueGen or within its own package to be reused for other purposed.

The 'com.jogamp.opengl.util.PMVMatrix' currently also used to feed in GLUniformData
via the toolkit agnostic SyncAction and SyncBuffer
shall also be split to a toolkit agnostic variant.

An OpenGL PMVMatrix specialization implementing GLMatrixFunc can still exist,
being derived from the toolkit agnostic base implementation.

+++

Initial commit .. compile clean, passing most unit tests.
---
 src/jogl/classes/com/jogamp/math/Binary64.java | 116 +++++++++++++++++++++++++
 1 file changed, 116 insertions(+)
 create mode 100644 src/jogl/classes/com/jogamp/math/Binary64.java

(limited to 'src/jogl/classes/com/jogamp/math/Binary64.java')

diff --git a/src/jogl/classes/com/jogamp/math/Binary64.java b/src/jogl/classes/com/jogamp/math/Binary64.java
new file mode 100644
index 000000000..8561cfa8d
--- /dev/null
+++ b/src/jogl/classes/com/jogamp/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.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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