thebookofshaders/glossary/log2.md
2015-04-18 10:41:34 -04:00

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## Log2
Return the base 2 logarithm of the parameter
### Declaration
```glsl
float log2(float x)
vec2 log2(vec2 x)
vec3 log2(vec3 x)
vec4 log2(vec4 x)
```
### Parameters
```x``` specify the value of which to take the base 2 logarithm.
### Description
```log2()``` returns the base 2 logarithm of ```x```.
<div class="simpleFunction" data="y = log2(x); "></div>
### See Also
[log](index.html#log.md), [exp](index.html#exp.md), [exp2](index.html#exp2.md), [Chapter 05: Shaping Functions](../05/)