Vector distance.

float distance ( floatn p0,
  floatn p1)

double distance (gentype p0, gentype p1) // if double extension enabled
half distance (gentype p0, gentype p1) // if half extension enabled


Returns the distance between p0 and p1. This is calculated as length(p0 - p1).


Built-in geometric functions operate component-wise and the description is per-component. The type name floatn indicates that the function can take float, float2, float3, or float4 as the type for the arguments.

The built-in geometric functions are implemented using the round to nearest even rounding mode.

The geometric functions can be implemented using contractions such as mad or fma.

If extended with cl_khr_fp64, generic type name gentype may indicate double and double{2|3|4} as arguments. If extended with cl_khr_fp16, generic type name gentype may indicate half and half{2|3|4} as arguments.


OpenCL Specification

Also see

Geometric Functions

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