Doing it this way enables us to get the mapBuffer() call working
during finalize. But we couldn't get the unmap call working. That
has to do with a bug in the Rusticl event waiting code.
This makes the stop() method capable of synchronously stopping all
engine/server-type async services which don't act in a self-moved
fashion but instead wait for a request.
Placing these functions in the public section kind of conceptually
confuses the reader since start/stop are indeed public interface
members in StimulusBuffer -- but they're not in the member objects.
It seems that whenever you have an HOST_PTR input buffer to be
"transferred" from the host to the GPU, whose contents must be
preserved, you must map it with WRITE_INVALIDATE_REGION on the
RPi5.
This makes little sense, but we'll have to let it be for now.
At least the code works now and we don't have to abandon using
OpenCL.
This method takes an input assembly buffer and selects which
OpenCL kernels need to be executed on that buffer to transform
the input data into the eventual output StimulusFrame for the
current timeslice period.
hayodea