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