Black Ops III is currently only supports DirectX platforms. This is a petition to have Treyarch make a OpenGL/Vulkan port in order to have support for other platforms such as Linux, Mac OS X, and SteamOS. It would require a somewhat large amount of effort on their part, however it would be very beneficial to the game's community. A large number of people have to dual boot Linux and Windows to be able to play their games that are only on Windows. If they port the Black Ops III engine to OpenGL or Vulkan, they could easily make future Call of Duty games support these platforms simply. This would also be beneficial to the other 2 companies that make the Call of Duty games, Sledgehammer Games and Infinity Ward.