IMO, the biggest issue with Linux gaming is not OpenGL, as others claim, but input support. Specifically, advanced controller support. SDL2 is far from enough.

IMO, the biggest issue with Linux gaming is not OpenGL, as others claim, but input support. Specifically, advanced controller support. SDL2 is far from enough. For windows, there's no issue adding support for Logitech G25, G27, F710, Microsoft gamepads and Joysticks (the best joysticks ever made), and several other wheels like Fanatec. In Linux it seems that only XBox360 compatibility is possible and everything else requires a huge amount of refactoring. Also, raw keyboard and mouse support requires having root permissions and whatnot, something users can't be expected to set up themselves. So, OpenGL has some performance issues but it works, input programming is actually a nightmare in comparison. Still no Steam game works with the G25. Euro Truck Simulator 2 can't read it right, despite having kernel support, and the game is simply boring with a controller instead of a wheel.