1 <?xml version=
"1.0" encoding=
"UTF-8"?>
2 <!DOCTYPE html PUBLIC
"-//W3C//DTD XHTML 1.0 Transitional//EN" "xhtml1-transitional.dtd">
3 <!-- saved from url=(0013)about:internet -->
4 <?xml-stylesheet type=
"text/xsl" href=
"mathml.xsl"?><html xmlns=
"http://www.w3.org/1999/xhtml" xmlns:
pref=
"http://www.w3.org/2002/Math/preference" pref:
renderer=
"mathplayer-dl"><head><meta http-equiv=
"Content-Type" content=
"text/html; charset=UTF-8" /><link rel=
"stylesheet" type=
"text/css" href=
"opengl-man.css" /><title>unpackUnorm - OpenGL Shading Language (GLSL)
</title><meta name=
"generator" content=
"DocBook XSL Stylesheets V1.69.1" /></head><body><div class=
"refentry" lang=
"en" xml:
lang=
"en"><a id=
"unpackUnorm"></a><div class=
"titlepage"></div><div class=
"refnamediv"><h2>Name
</h2><p>unpackUnorm2x16, unpackUnorm4x8, unpackSnorm4x8 — unpack floating-point values from an unsigned integer
</p></div><div class=
"refsynopsisdiv"><h2>Declaration
</h2><div class=
"funcsynopsis"><p><code class=
"funcdef">vec2
<b class=
"fsfunc">unpackUnorm2x16
</b>(
</code>uint
<var class=
"pdparam">p
</var><code>)
</code>;
</p><p><code class=
"funcdef">vec2
<b class=
"fsfunc">unpackSnorm2x16
</b>(
</code>uint
<var class=
"pdparam">p
</var><code>)
</code>;
</p><p><code class=
"funcdef">vec4
<b class=
"fsfunc">unpackUnorm4x8
</b>(
</code>uint
<var class=
"pdparam">p
</var><code>)
</code>;
</p><p><code class=
"funcdef">vec4
<b class=
"fsfunc">unpackSnorm4x8
</b>(
</code>uint
<var class=
"pdparam">p
</var><code>)
</code>;
</p></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"parameters"></a><h2>Parameters
</h2><div class=
"variablelist"><dl><dt><span class=
"term"><em class=
"parameter"><code>p
</code></em></span></dt><dd><p>
5 Specifies an unsigned integer containing packed floating-point values.
6 </p></dd></dl></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"description"></a><h2>Description
</h2><p>
7 <code class=
"function">unpackUnorm2x16
</code>,
<code class=
"function">unpackSnorm2x16
</code>,
<code class=
"function">unpackUnorm4x8
</code> and
<code class=
"function">unpackSnorm4x8
</code> unpack
8 single
32-bit unsigned integers, specified in the parameter
<em class=
"parameter"><code>p
</code></em> into a pair of
16-bit unsigned integers,
9 four
8-bit unsigned integers or four
8-bit signed integers. Then, each component is converted to a normalized floating-point
10 value to generate the returned two- or four-component vector.
12 The conversion for unpacked fixed point value
<span class=
"emphasis"><em>f
</em></span> to floating-point is performed as follows:
13 </p><div class=
"itemizedlist"><ul type=
"disc"><li><code class=
"function">packUnorm2x16
</code>:
<code class=
"code">f /
65535.0</code></li><li><code class=
"function">packSnorm2x16
</code>:
<code class=
"code"><a href=
"clamp.xml"><span class=
"citerefentry"><span class=
"refentrytitle">clamp
</span></span></a>(f /
32727.0, -
1.0,
1.0)
</code></li><li><code class=
"function">packUnorm4x8
</code>:
<code class=
"code">f /
255.0</code></li><li><code class=
"function">packSnorm4x8
</code>:
<code class=
"code"><a href=
"clamp.xml"><span class=
"citerefentry"><span class=
"refentrytitle">clamp
</span></span></a>(f /
127.0, -
1.0,
1.0)
</code></li></ul></div><p>
15 The first component of the returned vector will be extracted from the least significant bits of the input;
16 the last component will be extracted from the most significant bits.
17 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"versions"></a><h2>Version Support
</h2><div class=
"informaltable"><table border=
"1"><colgroup><col align=
"left" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /><col align=
"center" /></colgroup><thead><tr><th align=
"left"><span class=
"bold"><strong>Function
</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.10</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.20</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.30</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.40</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
1.50</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
3.30</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
4.00</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
4.10</strong></span></th><th align=
"left"><span class=
"bold"><strong>Version
4.20</strong></span></th><th align=
"center"><span class=
"bold"><strong>Version
4.30</strong></span></th></tr><tr><th align=
"left">unpackUnorm2x16
</th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th></tr><tr><th align=
"left">unpackSnorm2x16
</th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th></tr><tr><th align=
"left">unpackUnorm4x8
</th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th></tr><tr><th align=
"left">unpackSnorm4x8
</th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>-
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th><th align=
"center"><span class=
"emphasis"><em>Y
</em></span></th></tr></thead></table></div></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"seealso"></a><h2>See Also
</h2><p>
18 <a href=
"packUnorm2x16.xml"><span class=
"citerefentry"><span class=
"refentrytitle">packUnorm2x16
</span></span></a>,
19 <a href=
"packUnorm4x8.xml"><span class=
"citerefentry"><span class=
"refentrytitle">packUnorm4x8
</span></span></a>,
20 <a href=
"packSnorm4x8.xml"><span class=
"citerefentry"><span class=
"refentrytitle">packSnorm4x8
</span></span></a>
21 </p></div><div class=
"refsect1" lang=
"en" xml:
lang=
"en"><a id=
"Copyright"></a><h2>Copyright
</h2><p>
22 Copyright
<span class=
"trademark"></span>©
2011 Khronos Group.
23 This material may be distributed subject to the terms and conditions set forth in
24 the Open Publication License, v
1.0,
8 June
1999.
25 <a href=
"http://opencontent.org/openpub/" target=
"_top">http://opencontent.org/openpub/
</a>.
26 </p></div></div></body></html>