> ## Name

> all - returns true if a boolean scalar or all components of a boolean vector are true.

> ## Synopsis

>     bool all(bool a);
>     bool all(bool1 a);
>     bool all(bool2 a);
>     bool all(bool3 a);
>     bool all(bool4 a);

> ## Parameters

> a
>   Boolean vector or scalar of which to determine if any component is true.

> ## Description

> Returns true if a boolean scalar or all components of a boolean vector are true.

> ## Reference Implementation

> all for a bool4 vector could be implemented like this.

>     bool all(bool4 a)
>     {
>       return a.x && a.y && a.z && a.w;
>     }

> ## Profile Support

> all is supported in all profiles.

> Support in the fp20 is limited.

> ## See Also

> any