Not difficult, but feels weird. Vhdl looks like programming, but all the rows are executed in parallel all the time. You need to wrap your head around that leve

Not difficult, but feels weird. Vhdl looks like programming, but all the rows are executed in parallel all the time. You need to wrap your head around that level of parallelism. But once you do, I'm sure it'll also make you an excellent CUDA / OpenCL GPU programmer.