In addition to lots of bug fixes and build improvements, here are the major changes in this release:

General:

• Implemented audio capture support for some platforms

• Added SDL_DequeueAudio() to retrieve audio when buffer queuing is turned on for audio capture

• Added events for dragging and dropping text

• Added events for dragging and dropping multiple items

• By default the click raising a window will not be delivered to the SDL application. You can set the hint SDL_HINT_MOUSE_FOCUS_CLICKTHROUGH to "1" to allow that click through to the window.

• Saving a surface with an alpha channel as a BMP will use a newer BMP format that supports alpha information. You can set the hint SDL_HINT_BMP_SAVE_LEGACY_FORMAT to "1" to use the old format.

• Added SDL_GetHintBoolean() to get the boolean value of a hint

• Added SDL_RenderSetIntegerScale() to set whether to smoothly scale or use integral multiples of the viewport size when scaling the rendering output

• Added SDL_CreateRGBSurfaceWithFormat() and SDL_CreateRGBSurfaceWithFormatFrom() to create an SDL surface with a specific pixel format

• Added SDL_GetDisplayUsableBounds() which returns the area usable for windows. For example, on Mac OS X, this subtracts the area occupied by the menu bar and dock.

• Added SDL_GetWindowBordersSize() which returns the size of the window's borders around the client area

• Added a window event SDL_WINDOWEVENT_HIT_TEST when a window had a hit test that wasn't SDL_HITTEST_NORMAL (e.g. in the title bar or window frame)

• Added SDL_SetWindowResizable() to change whether a window is resizable

• Added SDL_SetWindowOpacity() and SDL_GetWindowOpacity() to affect the window transparency

• Added SDL_SetWindowModalFor() to set a window as modal for another window

• Added support for AUDIO_U16LSB and AUDIO_U16MSB to SDL_MixAudioFormat()

• Fixed flipped images when reading back from target textures when using the OpenGL renderer

• Fixed texture color modulation with SDL_BLENDMODE_NONE when using the OpenGL renderer

• Fixed bug where the alpha value of colorkeys was ignored when blitting in some cases

Windows:

• Added a hint SDL_HINT_WINDOWS_DISABLE_THREAD_NAMING to prevent SDL from raising a debugger exception to name threads. This exception can cause problems with .NET applications when running under a debugger.

• The hint SDL_HINT_THREAD_STACK_SIZE is now supported on Windows

• Fixed XBox controller triggers automatically being pulled at startup

• The first icon from the executable is used as the default window icon at runtime

• Fixed SDL log messages being printed twice if SDL was built with C library support

• Reset dead keys when the SDL window loses focus, so dead keys pressed in SDL applications don't affect text input into other applications.

Mac OS X:

• Fixed selecting the dummy video driver

• The caps lock key now generates a pressed event when pressed and a released event when released, instead of a press/release event pair when pressed.

• Fixed mouse wheel events on Mac OS X 10.12

• The audio driver has been updated to use AVFoundation for better compatibility with newer versions of Mac OS X

Linux:

• Added support for the Fcitx IME

• Added a window event SDL_WINDOWEVENT_TAKE_FOCUS when a window manager asks the SDL window whether it wants to take focus.

• Refresh rates are now rounded instead of truncated, e.g. 59.94 Hz is rounded up to 60 Hz instead of 59.

• Added initial support for touchscreens on Raspberry Pi

OpenBSD:

• SDL_GetBasePath() is now implemented on OpenBSD

iOS:

• Added support for dynamically loaded objects on iOS 8 and newer ** tvOS:**

• Added support for Apple TV

• Added a hint SDL_HINT_APPLE_TV_REMOTE_ALLOW_ROTATION to control whether he Apple TV remote's joystick axes will automatically match the rotation of the remote.

Android:

• Fixed SDL not resizing window when Android screen resolution changes

• Corrected the joystick Z axis reporting for the accelerometer

Emscripten (running in a web browser):

• Many bug fixes and improvements

https://www.libsdl.org/download-2.0.php