This is an admirable effort and thanks for doing it.

Have you experienced problems related to the lack of active support from AMD or Intel for OpenCL drivers? Thats been my experience with OpenCL several years ago. On a related note drivers for OpenGL on Linux and Windows from AMD and Intel have been a huge problem for developer for years. Somehow only NVidia cares and invests enough in non-windows driver support. This may be changing with Vulkan however and more focus on GPU compute.