This is a list of major changes in SDL's version history.

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2.0.2:

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General:

* Added an API to load a database of Game Controller mappings from a file:    

    SDL_GameControllerAddMappingsFromFile

Windows:

* Support for OpenGL ES 2.x contexts using either WGL or EGL (natively via

  the driver or emulated through ANGLE)

Android:

* Joystick support (minimum SDK version required to build SDL is now 12, 

  the required runtime version remains at 10, but on such devices joystick 

  support won't be available).

Linux:

* Fixed fullscreen and focused behavior when receiving NotifyGrab events

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2.0.1:

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General:

* Added an API to get common filesystem paths in SDL_filesystem.h:

    SDL_GetBasePath(), SDL_GetPrefPath()

* Added an API to do optimized YV12 and IYUV texture updates:

    SDL_UpdateYUVTexture()

* Added an API to get the amount of RAM on the system:

    SDL_GetSystemRAM()

* Added a macro to perform timestamp comparisons with SDL_GetTicks():

    SDL_TICKS_PASSED()

* Dramatically improved OpenGL ES 2.0 rendering performance

* Added OpenGL attribute SDL_GL_FRAMEBUFFER_SRGB_CAPABLE

Windows:

* Created a static library configuration for the Visual Studio 2010 project

* Added a hint to create the Direct3D device with support for multi-threading:

    SDL_HINT_RENDER_DIRECT3D_THREADSAFE

* Added a function to get the D3D9 adapter index for a display:

    SDL_Direct3D9GetAdapterIndex()

* Added a function to get the D3D9 device for a D3D9 renderer:

    SDL_RenderGetD3D9Device()

* Fixed building SDL with the mingw32 toolchain (mingw-w64 is preferred)

* Fixed crash when using two XInput controllers at the same time

* Fixed detecting a mixture of XInput and DirectInput controllers

* Fixed clearing a D3D render target larger than the window

* Improved support for format specifiers in SDL_snprintf()

Mac OS X:

* Added support for retina displays:

  Create your window with the SDL_WINDOW_ALLOW_HIGHDPI flag, and then use SDL_GL_GetDrawableSize() to find the actual drawable size. You are responsible for scaling mouse and drawing coordinates appropriately.

* Fixed mouse warping in fullscreen mode

* Right mouse click is emulated by holding the Ctrl key while left clicking

Linux:

* Fixed float audio support with the PulseAudio driver

* Fixed missing line endpoints in the OpenGL renderer on some drivers

* X11 symbols are no longer defined to avoid collisions when linking statically

iOS:

* Fixed status bar visibility on iOS 7

* Flipped the accelerometer Y axis to match expected values

Android:

IMPORTANT: You MUST get the updated SDLActivity.java to match C code

* Moved EGL initialization to native code 

* Fixed the accelerometer axis rotation relative to the device rotation

* Fixed race conditions when handling the EGL context on pause/resume

* Touch devices are available for enumeration immediately after init

Raspberry Pi:

* Added support for the Raspberry Pi, see README-raspberrypi.txt for details