> And there are no open source drivers for compute.

Well, technically ROCm is open source (although it comes across more as a "dump source code releases every now and then" to me.)

Also, the link is from the Mesa project, which is working on an OpenCL frontend to the driver called rusticl. It's not yet stable or enabled by default, but if you get a build of it, you can try setting the environment variable `RUSTICL_ENABLE=radeonsi` and it should sort-of work (on any Radeon HD 7000 or Radeon R7/R9/RX GPU!)

iirc the rusticl developers are even hoping/planning to get HIP (via chipStar) and SYCL (via Intel's compiler) working on top of rusticl.