isinf.3Cg

Langue: en

Version: 355345 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

Sommaire

NAME

isinf - test whether or not a scalar or each vector component is infinite

SYNOPSIS

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

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

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

PARAMETERS


x
Vector or scalar to test if infinite.

DESCRIPTION

Returns whether or not a scalar or each vector component is a (negative or positive) infinite value. Finite and not-a-number (NaN) values are not infinite.

REFERENCE IMPLEMENTATION

isinf for float3 vectors could be implemented like this. 
   bool3 isinf(float3 s)
   {
     // By IEEE 754 rule, 2*Inf equals Inf
     return (2*s == s) && (s != 0);
   }

PROFILE SUPPORT

isinf is supported in all profiles except fp20.

SEE ALSO

isfinite, isnan