NAME
isnan - test whether or not a scalar or each vector component is not-a-number
SYNOPSIS
bool isnan(float x); bool1 isnan(float1 x); bool2 isnan(float2 x); bool3 isnan(float3 x); bool4 isnan(float4 x); bool isnan(half x); bool1 isnan(half1 x); bool2 isnan(half2 x); bool3 isnan(half3 x); bool4 isnan(half4 x); bool isnan(fixed x); bool1 isnan(fixed1 x); bool2 isnan(fixed2 x); bool3 isnan(fixed3 x); bool4 isnan(fixed4 x);PARAMETERS
- x
Vector or scalar to test for being NaN.
DESCRIPTION
Returns whether or not a scalar or each vector component is not-a-number (NaN) Finite and infinite values are not NaN.
REFERENCE IMPLEMENTATION
isnan for float3 vectors could be implemented like this.
bool3 isnan(float3 s) { // By IEEE 754 rule, NaN is not equal to NaN return s != s; }PROFILE SUPPORT
isnan is supported in all profiles except fp20.
SEE ALSO