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isnan.3Cg

Langue: en

Version: 356488 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

isnan - test whether or not a scalar or each vector component is not-a-number

   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);

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

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;
   }

isnan is supported in all profiles except fp20.