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abs.3Cg

NAME

abs - returns absolute value of scalars and vectors.

SYNOPSIS

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

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

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

PARAMETERS

a

Vector or scalar of which to determine the absolute value.

DESCRIPTION

Returns the absolute value of a scalar or vector.

For vectors, the returned vector contains the absolute value of each element of the input vector.

REFERENCE IMPLEMENTATION

abs for a float scalar could be implemented like this.

   float abs(float a)
   {
     return max(-a, a);
   }
 
 
 

PROFILE SUPPORT

abs is supported in all profiles.

Support in the fp20 is limited.

Consider abs to be free or extremely inexpensive.

SEE ALSO

max