How to replace deprecated "new Context(Device.TYPE_GPU)"

[Daniel-Alievsky]

I used the constructor "new Context(int dtype)" to get information about installed GPU devices. However, in current version this constructor is deprecated. How can I replace this call in modern API?

[saudet]

You're talking about OpenCV, right? Context.create(String), Context.getDefault(), or Context.fromDevice() don't look deprecated, so I guess we should be using one of those. But the available sample suggests attachContext() is the recommended way of going about that:
https://github.com/opencv/opencv/blob/4.x/samples/opencl/opencl-opencv-interop.cpp#L641

[Daniel-Alievsky]

Yes, OpenCV. Maybe you know, how can I replace my simplest call Context context = new Context(Device.TYPE_GPU) ?

For Context.create(String), which string should be here?

[saudet]

My guess is that we can loop over the devices returned by Context.getDefault().

[Daniel-Alievsky]

Right, but I don't see a simple way to detect which devices support GPU. TYPE_GPU was a convenient flag. Is it deprecated at all?

[saudet]

That's just a flag. We can easily use the API from OpenCL to query devices:
https://github.com/opencv/opencv/blob/4.x/samples/android/tutorial-4-opencl/jni/CLprocessor.cpp#L113
The C++ API of OpenCL hasn't been mapped (yet), but the C API is available:
http://bytedeco.org/javacpp-presets/opencl/apidocs/