'\" t
.\"     Title: unpackUnorm
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: 01/03/2018
.\"    Manual: [FIXME: manual]
.\"    Source: [FIXME: source]
.\"  Language: English
.\"
.TH "UNPACKUNORM" "3G" "01/03/2018" "[FIXME: source]" "[FIXME: manual]"
.\" -----------------------------------------------------------------
.\" * Define some portability stuff
.\" -----------------------------------------------------------------
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.\" http://bugs.debian.org/507673
.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
.ie \n(.g .ds Aq \(aq
.el       .ds Aq '
.\" -----------------------------------------------------------------
.\" * set default formatting
.\" -----------------------------------------------------------------
.\" disable hyphenation
.nh
.\" disable justification (adjust text to left margin only)
.ad l
.\" -----------------------------------------------------------------
.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
unpackUnorm2x16,_unpackUnorm4x8,_unpackSnorm4x8 \- unpack floating\-point values from an unsigned integer
.SH "DECLARATION"
.HP \w'vec2\ unpackUnorm2x16('u
.BI "vec2 unpackUnorm2x16(uint\ " "p" ");"
.HP \w'vec2\ unpackSnorm2x16('u
.BI "vec2 unpackSnorm2x16(uint\ " "p" ");"
.HP \w'vec4\ unpackUnorm4x8('u
.BI "vec4 unpackUnorm4x8(uint\ " "p" ");"
.HP \w'vec4\ unpackSnorm4x8('u
.BI "vec4 unpackSnorm4x8(uint\ " "p" ");"
.SH "PARAMETERS"
.PP
\fIp\fR
.RS 4
Specifies an unsigned integer containing packed floating\-point values\&.
.RE
.SH "DESCRIPTION"
.PP
\fBunpackUnorm2x16\fR,
\fBunpackSnorm2x16\fR,
\fBunpackUnorm4x8\fR
and
\fBunpackSnorm4x8\fR
unpack single 32\-bit unsigned integers, specified in the parameter
\fIp\fR
into a pair of 16\-bit unsigned integers, four 8\-bit unsigned integers or four 8\-bit signed integers\&. Then, each component is converted to a normalized floating\-point value to generate the returned two\- or four\-component vector\&.
.PP
The conversion for unpacked fixed point value
\fIf\fR
to floating\-point is performed as follows:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fBpackUnorm2x16\fR:
f / 65535\&.0
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fBpackSnorm2x16\fR:
\fBclamp\fR(f / 32727\&.0, \-1\&.0, 1\&.0)
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fBpackUnorm4x8\fR:
f / 255\&.0
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
\fBpackSnorm4x8\fR:
\fBclamp\fR(f / 127\&.0, \-1\&.0, 1\&.0)
.RE
.PP
The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits\&.
.SH "VERSION SUPPORT"
.TS
allbox tab(:);
lB cB s s s s s s s s s s s
lB cB cB cB cB cB cB cB cB cB cB cB cB.
T{

T}:T{
\fBOpenGL Shading Language Version\fR
T}
T{
\fBFunction Name\fR
T}:T{
\fB1\&.10\fR
T}:T{
\fB1\&.20\fR
T}:T{
\fB1\&.30\fR
T}:T{
\fB1\&.40\fR
T}:T{
\fB1\&.50\fR
T}:T{
\fB3\&.30\fR
T}:T{
\fB4\&.00\fR
T}:T{
\fB4\&.10\fR
T}:T{
\fB4\&.20\fR
T}:T{
\fB4\&.30\fR
T}:T{
\fB4\&.40\fR
T}:T{
\fB4\&.50\fR
T}
.T&
l c c c c c c c c c c c c
l c c c c c c c c c c c c
l c c c c c c c c c c c c
l c c c c c c c c c c c c.
T{
unpackUnorm2x16
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
T{
unpackSnorm2x16
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
T{
unpackUnorm4x8
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
T{
unpackSnorm4x8
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
\-
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}:T{
✔
T}
.TE
.sp 1
.SH "SEE ALSO"
.PP

\fBpackUnorm2x16\fR,

\fBpackUnorm4x8\fR,

\fBpackSnorm4x8\fR
.SH "COPYRIGHT"
.PP
Copyright
\(co
2011\-2014 Khronos Group\&. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1\&.0, 8 June 1999\&.
\m[blue]\fBhttp://opencontent\&.org/openpub/\fR\m[]\&.
.SH "COPYRIGHT"
.br
Copyright \(co 2011-2014 Khronos Group
.br