[pimeys]

What I understood one of the reasons they keep their source closed is that it's full of stuff like:

`if (game == "Fifa2016") use_nvidia_custom_shaders() ...`

So games don't work quite fast and the game companies ask nVidia to fix it in their drivers, which might do stuff such as adding custom shaders to get that good fps. That's why many major games require you to update to the latest nVidia drivers before running.

I don't know how much AMD does this, their open source support is excellent nowadays.