NAME

abs - returns absolute value of scalars and vectors.

SYNPOSIS

  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