isfinite
Keywords: isfinite, NVIDIA, NVIDIA Cg Toolkit, Cg Toolkit, Shader, Shader Programming, GPU Shader Programming, GPU Program

> ## Name

> isfinite - test whether or not a scalar or each vector component is a finite value

> ## Synopsis

>     bool  isfinite(float x);
>     bool1 isfinite(float1 x);
>     bool2 isfinite(float2 x);
>     bool3 isfinite(float3 x);
>     bool4 isfinite(float4 x);

>     bool   isfinite(half x);
>     bool1  isfinite(half1 x);
>     bool2  isfinite(half2 x);
>     bool3  isfinite(half3 x);
>     bool4  isfinite(half4 x);

>     bool  isfinite(fixed x);
>     bool1 isfinite(fixed1 x);
>     bool2 isfinite(fixed2 x);
>     bool3 isfinite(fixed3 x);
>     bool4 isfinite(fixed4 x);

> ## Parameters

> x
>   Vector or scalar to test for finiteness.

> ## Description

> Returns whether or not a scalar or each vector component is a finite value. Infinity and not-a-number (NaN) values are not finite.

> ## Reference Implementation

> isfinite for float3 vectors could be implemented like this.

>     bool3 isfinite(float3 s)
>     {
>       // By IEEE 754 rule, 2*Inf equals Inf
>       return (s == s) && ((s == 0) || (s != 2*s));
>     }

> ## Profile Support

> isfinite is supported in all profiles except fp20.

> ## See Also

> isinf, isnan