isfinite.3Cg

Langue: en

Version: 359087 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

Sommaire

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