This is a fantastic overview. I learned a lot, thanks!

As someone whose only experience with GPU programming (except very high-level stuff via Torch) has been OpenCL, I gotta say I found it really pleasant! I've always wondered why it didn't take off, and hate the current situation.

I looked with hope at Vulkan, but am saddened by what you write about it. Could you elaborate on what the state of Vulkan Compute is, and where it might go from here?