## Mix
Constrain a value to lie between two further values

```glsl
float mix(float x, float y, float a)  
vec2 mix(vec2 x, vec2 y, vec2 a)  
vec3 mix(vec3 x, vec3 y, vec3 a)  
vec4 mix(vec4 x, vec4 y, vec4 a)
```

```glsl
vec2 mix(vec2 x, vec2 y, float a)  
vec3 mix(vec3 x, vec3 y, float a)  
vec4 mix(vec4 x, vec4 y, float a)
```

### Parameters
```x``` Specify the start of the range in which to interpolate.

```y``` Specify the end of the range in which to interpolate.

```a``` Specify the value to use to interpolate between x and y.

### Description
```mix()``` performs a linear interpolation between ```x``` and ```y``` using ```a``` to weight between them. The return value is computed as ```x×(1−a)+y×a```.

<div class="codeAndCanvas" data="../06/mix.frag"></div>

<div class="codeAndCanvas" data="../06/gradient.frag"></div>

### See Also

[min](index.html#min.md), [max](index.html#max.md), [Chapter 06: Color](../06/)