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