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

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2.0.4:

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General:

* Added support for web applications using Emscripten, see docs/README-emscripten.md for more information

* Added support for web applications using Native Client (NaCl), see docs/README-nacl.md for more information

* Added an API to queue audio instead of using the audio callback:

    SDL_QueueAudio(), SDL_GetQueuedAudioSize(), SDL_ClearQueuedAudio()

* Added events for audio device hot plug support:

    SDL_AUDIODEVICEADDED, SDL_AUDIODEVICEREMOVED

* Added SDL_PointInRect()

* Added SDL_HasAVX2() to detect CPUs with AVX2 support

* Added SDL_SetWindowHitTest() to let apps treat parts of their SDL window like traditional window decorations (drag areas, resize areas)

* Added SDL_GetGrabbedWindow() to get the window that currently has input grab, if any

* Added SDL_RenderIsClipEnabled() to tell whether clipping is currently enabled in a renderer

* Added SDL_CaptureMouse() to capture the mouse to get events while the mouse is not in your window

* Added SDL_WarpMouseGlobal() to warp the mouse cursor in global screen space

* Added SDL_GetGlobalMouseState() to get the current mouse state outside of an SDL window

* Added a direction field to mouse wheel events to tell whether they are flipped (natural) or not

* Added GL_CONTEXT_RELEASE_BEHAVIOR GL attribute (maps to [WGL|GLX]_ARB_context_flush_control extension)

* Added EGL_KHR_create_context support to allow OpenGL ES version selection on some platforms

* Added NV12 and NV21 YUV texture support for OpenGL and OpenGL ES 2.0 renderers

* Added a Vivante video driver that is used on various SoC platforms

* Added an event SDL_RENDER_DEVICE_RESET that is sent from the D3D renderers when the D3D device is lost, and from Android's event loop when the GLES context had to be recreated

* Added a hint SDL_HINT_NO_SIGNAL_HANDLERS to disable SDL's built in signal handling

* Added a hint SDL_HINT_THREAD_STACK_SIZE to set the stack size of SDL's threads

* Added SDL_sqrtf(), SDL_tan(), and SDL_tanf() to the stdlib routines

* Improved support for WAV and BMP files with unusual chunks in them

* Renamed SDL_assert_data to SDL_AssertData and SDL_assert_state to SDL_AssertState

* Added a hint SDL_HINT_WINDOW_FRAME_USABLE_WHILE_CURSOR_HIDDEN to prevent window interaction while cursor is hidden

* Added SDL_GetDisplayDPI() to get the DPI information for a display

* Added SDL_JoystickCurrentPowerLevel() to get the battery level of a joystick

* Added SDL_JoystickFromInstanceID(), as a helper function, to get the SDL_Joystick* that an event is referring to.

* Added SDL_GameControllerFromInstanceID(), as a helper function, to get the SDL_GameController* that an event is referring to.

Windows:

* Added support for Windows Phone 8.1 and Windows 10/UWP (Universal Windows Platform)

* Timer resolution is now 1 ms by default, adjustable with the SDL_HINT_TIMER_RESOLUTION hint

* SDLmain no longer depends on the C runtime, so you can use the same .lib in both Debug and Release builds

* Added SDL_SetWindowsMessageHook() to set a function to be called for every windows message before TranslateMessage()

* Added a hint SDL_HINT_WINDOWS_ENABLE_MESSAGELOOP to control whether SDL_PumpEvents() processes the Windows message loop

* You can distinguish between real mouse and touch events by looking for SDL_TOUCH_MOUSEID in the mouse event "which" field

* SDL_SysWMinfo now contains the window HDC

* Added support for Unicode command line options

* Prevent beeping when Alt-key combos are pressed

* SDL_SetTextInputRect() re-positions the OS-rendered IME

* Added a hint SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4 to prevent generating SDL_WINDOWEVENT_CLOSE events when Alt-F4 is pressed

* Added a hint SDL_HINT_XINPUT_USE_OLD_JOYSTICK_MAPPING to use the old axis and button mapping for XInput devices (deprecated)

Mac OS X:

* Implemented drag-and-drop support

* Improved joystick hot-plug detection

* The SDL_WINDOWEVENT_EXPOSED window event is triggered in the appropriate situations

* Fixed relative mouse mode when the application loses/regains focus

* Fixed bugs related to transitioning to and from Spaces-aware fullscreen-desktop mode

* Fixed the refresh rate of display modes

* SDL_SysWMInfo is now ARC-compatible

* Added a hint SDL_HINT_MAC_BACKGROUND_APP to prevent forcing the application to become a foreground process

Linux:

* Enabled building with Mir and Wayland support by default.

* Added IBus IME support

* Added a hint SDL_HINT_IME_INTERNAL_EDITING to control whether IBus should handle text editing internally instead of sending SDL_TEXTEDITING events

* Added a hint SDL_HINT_VIDEO_X11_NET_WM_PING to allow disabling _NET_WM_PING protocol handling in SDL_CreateWindow()

* Added support for multiple audio devices when using Pulseaudio

* Fixed duplicate mouse events when using relative mouse motion

iOS:

* Added support for iOS 8

* The SDL_WINDOW_ALLOW_HIGHDPI window flag now enables high-dpi support, and SDL_GL_GetDrawableSize() or SDL_GetRendererOutputSize() gets the window resolution in pixels

* SDL_GetWindowSize() and display mode sizes are in the "DPI-independent points" / "screen coordinates" coordinate space rather than pixels (matches OS X behavior)

* Added native resolution support for the iPhone 6 Plus

* Added support for MFi game controllers

* Added support for the hint SDL_HINT_ACCELEROMETER_AS_JOYSTICK

* Added sRGB OpenGL ES context support on iOS 7+

* Added support for SDL_DisableScreenSaver(), SDL_EnableScreenSaver() and the hint SDL_HINT_VIDEO_ALLOW_SCREENSAVER

* SDL_SysWMinfo now contains the OpenGL ES framebuffer and color renderbuffer objects used by the window's active GLES view

* Fixed various rotation and orientation issues

* Fixed memory leaks

Android:

* Added a hint SDL_HINT_ANDROID_SEPARATE_MOUSE_AND_TOUCH to prevent mouse events from being registered as touch events

* Added hints SDL_HINT_ANDROID_APK_EXPANSION_MAIN_FILE_VERSION and SDL_HINT_ANDROID_APK_EXPANSION_PATCH_FILE_VERSION

* Added support for SDL_DisableScreenSaver(), SDL_EnableScreenSaver() and the hint SDL_HINT_VIDEO_ALLOW_SCREENSAVER

* Added support for SDL_ShowMessageBox() and SDL_ShowSimpleMessageBox()

Raspberry Pi:

* Added support for the Raspberry Pi 2

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2.0.3:

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Mac OS X:

* Fixed creating an OpenGL context by default on Mac OS X 10.6

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2.0.2:

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General:

* Added SDL_GL_ResetAttributes() to reset OpenGL attributes to default values

* Added an API to load a database of game controller mappings from a file:

    SDL_GameControllerAddMappingsFromFile(), SDL_GameControllerAddMappingsFromRW()

* Added game controller mappings for the PS4 and OUYA controllers

* Added SDL_GetDefaultAssertionHandler() and SDL_GetAssertionHandler()

* Added SDL_DetachThread()

* Added SDL_HasAVX() to determine if the CPU has AVX features

* Added SDL_vsscanf(), SDL_acos(), and SDL_asin() to the stdlib routines

* EGL can now create/manage OpenGL and OpenGL ES 1.x/2.x contexts, and share

  them using SDL_GL_SHARE_WITH_CURRENT_CONTEXT

* Added a field "clicks" to the mouse button event which records whether the event is a single click, double click, etc.

* The screensaver is now disabled by default, and there is a hint SDL_HINT_VIDEO_ALLOW_SCREENSAVER that can change that behavior.

* Added a hint SDL_HINT_MOUSE_RELATIVE_MODE_WARP to specify whether mouse relative mode should be emulated using mouse warping.

* testgl2 does not need to link with libGL anymore

* Added testgles2 test program to demonstrate working with OpenGL ES 2.0

* Added controllermap test program to visually map a game controller

Windows:

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

  the driver or emulated through ANGLE)

* Added a hint SDL_HINT_VIDEO_WIN_D3DCOMPILER to specify which D3D shader compiler to use for OpenGL ES 2 support through ANGLE

* Added a hint SDL_HINT_VIDEO_WINDOW_SHARE_PIXEL_FORMAT that is useful when creating multiple windows that should share the same OpenGL context.

* Added an event SDL_RENDER_TARGETS_RESET that is sent when D3D9 render targets are reset after the device has been restored.

Mac OS X:

* Added a hint SDL_HINT_MAC_CTRL_CLICK_EMULATE_RIGHT_CLICK to control whether Ctrl+click should be treated as a right click on Mac OS X. This is off by default.

Linux:

* Fixed fullscreen and focused behavior when receiving NotifyGrab events

* Added experimental Wayland and Mir support, disabled by default

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).

* Hotplugging support for joysticks

* Added a hint SDL_HINT_ACCELEROMETER_AS_JOYSTICK to control whether the accelerometer should be listed as a 3 axis joystick, which it will by default.

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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