Sure, but with OpenGL's state system you could only safely use it from a single thread. Even if you had multiple threads using it, you still needed a command bu

Sure, but with OpenGL's state system you could only safely use it from a single thread. Even if you had multiple threads using it, you still needed a command buffer to safely operate it from one thread processing the commands on the command buffer. Vulkan is capable of being fed commands directly from multiple threads.