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# docs.GL

GLSL 4
GLSL ES 3

# log2

## Name

log2 — return the base 2 logarithm of the parameter

## Declaration

`genType log2(` | genType x`)`;

## Parameters

`x`

  Specify the value of which to take the base 2 logarithm.

## Description

`log2` returns the base 2 logarithm of `x`. i.e., the value y which satisfies x=2 y. Results are undefined if `x` ≤ 0.

## Version Support

| OpenGL ES Shading Language Version
--- | ---
Function Name | 1.00 | 3.00 | 3.10
log2 | ✔ | ✔ | ✔

## See Also

exp, log, exp2

## 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. https://opencontent.org/openpub/.

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