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Valve uses SDL 2.0 for game controller support and sundry other things in Steam, and the new release will be going into the Steam Linux Runtime in the next day or so.
These are the most important new features in SDL 2.0:
Full 3D hardware acceleration
Support for OpenGL 3.0+ in various profiles (core, compatibility, debug, robust, etc)
Support for OpenGL ES
Support for multiple windows
Support for multiple displays
Support for multiple audio devices
Android and iOS support
Simple 2D rendering API that can use Direct3D, OpenGL, OpenGL ES, or software rendering behind the scenes
Force Feedback available on Windows, Mac OS X and Linux
XInput and XAudio2 support for Windows
Atomic operations
Power management (exposes battery life remaining, etc)
Shaped windows
32-bit audio (int and float)
Simplified Game Controller API (the Joystick API is still here, too!)
Touch support (multitouch, gestures, etc)
Better fullscreen support
Better keyboard support (scancodes vs keycodes, etc).
Nice. Two things missing in that list that I think are important:
- Full Wayland support, so any game using SDL2 will work in X and Wayland without a problem
- license changed to the zlib license, which may attract more commercial developers than the previous LGPL license.
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