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exp.3Cg

Langue: en

Version: 345301 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

exp - returns the base-e exponential of scalars and vectors

   float  exp(float a);
   float1 exp(float1 a);
   float2 exp(float2 a);
   float3 exp(float3 a);
   float4 exp(float4 a);

   half   exp(half a);
   half1  exp(half1 a);
   half2  exp(half2 a);
   half3  exp(half3 a);
   half4  exp(half4 a);

   fixed  exp(fixed a);
   fixed1 exp(fixed1 a);
   fixed2 exp(fixed2 a);
   fixed3 exp(fixed3 a);
   fixed4 exp(fixed4 a);

a: Vector or scalar of which to determine the base-e exponential. The value e is approximately 2.71828182845904523536.

Returns the base-e exponential a.

For vectors, the returned vector contains the base-e exponential of each element of the input vector.

   float3 exp(float3 a)
   {
     float3 rv;
     int i;

     for (i=0; i<3; i++) {
       rv[i] = exp(a[i]);  // this is the ANSI C standard library exp()
     }
     return rv;
   }

exp is typically implemented with either a native base-2 exponentional instruction or pow.

exp is fully supported in all profiles unless otherwise specified.

Support in the fp20 is limited to constant compile-time evaluation.