inversesqrt - OpenGL 4 Reference Pages

## Name

inversesqrt — return the inverse of the square root of the parameter

## Declaration

`genType inversesqrt(` | genType x`)`;

`genDType inversesqrt(` | genDType x`)`;

## Parameters

`x`

  Specify the value of which to take the inverse of the square root.

## Description

`inversesqrt` returns the inverse of the square root of $x$; i.e. the value $1 \over { \sqrt x }$. The result is undefined if $x \leq 0$.

## Version Support

| OpenGL Shading Language Version
--- | ---
Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50
inversesqrt (genType) | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔
inversesqrt (genDType) | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ | ✔

## See Also

pow, sqrt

## 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/.