unpackUnorm - OpenGL ES 3 Reference Pages

## Name

unpackUnorm2x16, unpackSnorm2x16 — unpack floating-point values from an unsigned integer

## Declaration

`vec2 unpackUnorm2x16(` | uint p`)`;

`vec2 unpackSnorm2x16(` | uint p`)`;

## Parameters

`p`

  Specifies an unsigned integer containing packed floating-point values.

## Description

`unpackUnorm2x16`, `unpackSnorm2x16` unpack single 32-bit unsigned integers, specified in the parameter `p` into a pair of 16-bit unsigned 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:

- `unpackUnorm2x16`: `f / 65535.0`

- `unpackSnorm2x16`: `clamp(f / 32727.0, -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 ES Shading Language Version
--- | ---
Function Name | 1.00 | 3.00
unpackUnorm2x16 | - | ✔
unpackSnorm2x16 | - | ✔

## See Also

clamp, packUnorm2x16, packSnorm2x16

## 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/.