Thanks for your interest! If you want to dig into the project, another good resource is the #gpu stream on xi.zulipchat.com. That has some more in-depth discussions as well.

I'm openly embracing the fact that piet-gpu is advanced research into not just 2D rendering, but parallel algorithms and also GPU infrastructure. The fact that it's doing advanced compute portably is not something a lot of other projects can claim. Unfortunately, it adds constraints and makes the code more difficult than it would be if it were targeting a single GPU.

So, feel free to ask questions, and I'll do my best to answer them. Education is part of what I'm trying to do, and I'd like to put together more resources for understanding both piet-gpu and also compute shader programming more generally.