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.. _opencl-default-kernels:
OpenCL default kernels
======================
This section lists all kernel functions that are available to the
:gobj:class:`opencl` filter if no filename is specified.
.. c:function:: void fix_nan_and_inf ()
Sets element to 0.0 if it is NaN or Inf.
.. c:function:: void absorptivity ()
Computes :math:`f(x) = -log(x)`.
.. c:function:: void nlm_noise_reduction ()
Smooths data within a local neighbourhood.
.. c:function:: void diff ()
Computes :math:`f(x, y) = x - y`.
.. _opencl-reduction-default-kernels:
OpenCL reduction default kernels
================================
This section lists all kernel functions that are available to the
:gobj:class:`opencl-reduce` filter if no filename is specified. These kernels
are supposed to be used for the ``kernel`` argument.
.. c:function:: void minimum ()
Computes the minimum of each pixel in the stream.
.. c:function:: void maximum ()
Computes the maximum of each pixel in the stream.
.. c:function:: void sum ()
Computes the sum of each pixel in the stream.
These kernels are supposed to be used in the ``finish`` argument:
.. c:function:: void divide ()
Divides each pixel by the stream count. Together with ``sum`` this can be
used to compute the average, i.e.::
ufo-launch .. ! opencl-reduce kernel=sum finish=divide ! ..
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