"Not really" what? There is syscall? Then you say yourself there is not... I only argue that there is no syscall in glDraw* as well as the vast majority of the

"Not really" what? There is syscall? Then you say yourself there is not... I only argue that there is no syscall in glDraw* as well as the vast majority of the APIs. Sure, driver/opengl do whatever and some calls are more expensive than others but adding more overhead is not going to make it any better and it's already pretty bad without overhead. That's why they developed Vulkan in the first place.