NAME

       unpackUnorm2x16,_unpackUnorm4x8,_unpackSnorm4x8 - unpack floating-point values from an unsigned integer

DECLARATION

       vec2 unpackUnorm2x16(uint p);

       vec2 unpackSnorm2x16(uint p);

       vec4 unpackUnorm4x8(uint p);

       vec4 unpackSnorm4x8(uint p);

PARAMETERS

       p
           Specifies an unsigned integer containing packed floating-point values.

DESCRIPTION

       unpackUnorm2x16, unpackSnorm2x16, unpackUnorm4x8 and unpackSnorm4x8 unpack single 32-bit unsigned
       integers, specified in the parameter p 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.

       The conversion for unpacked fixed point value f to floating-point is performed as follows:

       •   packUnorm2x16: f / 65535.0

       •   packSnorm2x16: clamp(f / 32727.0, -1.0, 1.0)

       •   packUnorm4x8: f / 255.0

       •   packSnorm4x8: clamp(f / 127.0, -1.0, 1.0)

       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.

VERSION SUPPORT

       ┌─────────────────┬───────────────────────────────────────────────────────────────────────────────────┐
       │                 │        OpenGL Shading Language Version                                            │
       ├─────────────────┼──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┬──────┤
       │ Function        │ 1.10 │ 1.20 │ 1.30 │ 1.40 │ 1.50 │ 3.30 │ 4.00 │ 4.10 │ 4.20 │ 4.30 │ 4.40 │ 4.50 │
       │ Name            │      │      │      │      │      │      │      │      │      │      │      │      │
       ├─────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │ unpackUnorm2x16 │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       ├─────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │ unpackSnorm2x16 │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │
       ├─────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │ unpackUnorm4x8  │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       ├─────────────────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┼──────┤
       │ unpackSnorm4x8  │  -   │  -   │  -   │  -   │  -   │  -   │  -   │  ✔   │  ✔   │  ✔   │  ✔   │  ✔   │
       └─────────────────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┴──────┘

SEE ALSO

       packUnorm2x16,

       packUnorm4x8,

       packSnorm4x8

COPYRIGHT

       Copyright © 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.  http://opencontent.org/openpub/.

COPYRIGHT

       Copyright © 2011-2014 Khronos Group

[FIXME: source]                                    01/03/2018                                    UNPACKUNORM(3G)