I recently installed VC4CL as instructed from the Github repo's on my RPI3B running Raspbian Stretch and everything installed just fine.
I then installed OpenCV with OpenCL enables and that worked fine as well.
I then tried to run a Python script (with 'sudo') that uses OpenCV's detectMultiScale Haar Cascade Classifier which worked as expected, but with no speedup compared to not having VC4CL installed. The CPU was still being used. I've seen the source code so I know that the function has an OpenCL implementation.
Does anyone have any pointers on where to start debugging this? The code isn't throwing any errors or anything, just seems to skip using OpenCL altogether.
Any help would be greatly appreciated.