As I understand GPU vendors defined standard interface to be used by OS Developers to communicate with their specific driver. So DirectX and OpenGL are just wrappers.

As I understand GPU vendors defined standard interface to be used by OS Developers to communicate with their specific driver. So DirectX and OpenGL are just wrappers for that interface. When OS developers decide to create new version of Graphic API, GPU vendors expand their interface (new routines are faster and older ones are left for compatibility issues) and OS developers use this new part of interface. So, when it is said that GPU vendors' support for DirectX is better than for OpenGL, does it simply mean that GPU vendors primarily take into account Microsoft's future plans of developing DirectX API structure and adjust future development of this interface to their needs?

Or there is some technical reasons before this? As I understand GPU vendors defined standard interface to be used by OS Developers to communicate with their specific driver. So DirectX and OpenGL are just wrappers for that interface. No, not really. Cap Bdu Uniform Patch Placement.