Update SDL2 to latest hg (fbfacc66c65c)

libs/SDL2/include/SDL_hints.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2017 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -76,6 +76,7 @@ extern "C" {
  *    "opengl"
  *    "opengles2"
  *    "opengles"
+ *    "metal"
  *    "software"
  *
  *  The default varies by platform, but it's the first one in the list that
@@ -210,6 +211,18 @@ extern "C" {
  */
 #define SDL_HINT_VIDEO_X11_NET_WM_PING      "SDL_VIDEO_X11_NET_WM_PING"
 
+/**
+ * \brief A variable controlling whether the X11 _NET_WM_BYPASS_COMPOSITOR hint should be used.
+ * 
+ * This variable can be set to the following values:
+ * "0" - Disable _NET_WM_BYPASS_COMPOSITOR
+ * "1" - Enable _NET_WM_BYPASS_COMPOSITOR
+ * 
+ * By default SDL will use _NET_WM_BYPASS_COMPOSITOR
+ * 
+ */
+#define SDL_HINT_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR "SDL_VIDEO_X11_NET_WM_BYPASS_COMPOSITOR"
+
 /**
  *  \brief  A variable controlling whether the window frame and title bar are interactive when the cursor is hidden 
  *
@@ -355,16 +368,36 @@ extern "C" {
 #define SDL_HINT_APPLE_TV_REMOTE_ALLOW_ROTATION "SDL_APPLE_TV_REMOTE_ALLOW_ROTATION"
 
 /**
- *  \brief  A variable controlling whether the Android / iOS built-in
- *  accelerometer should be listed as a joystick device, rather than listing
- *  actual joysticks only.
+ * \brief  A variable controlling whether the home indicator bar on iPhone X
+ *         should be hidden.
  *
  *  This variable can be set to the following values:
- *    "0"       - List only real joysticks and accept input from them
- *    "1"       - List real joysticks along with the accelerometer as if it were a 3 axis joystick (the default).
+ *    "0"       - The indicator bar is not hidden (default for windowed applications)
+ *    "1"       - The indicator bar is hidden and is shown when the screen is touched (useful for movie playback applications)
+ *    "2"       - The indicator bar is dim and the first swipe makes it visible and the second swipe performs the "home" action (default for fullscreen applications)
+ */
+#define SDL_HINT_IOS_HIDE_HOME_INDICATOR "SDL_IOS_HIDE_HOME_INDICATOR"
+
+/**
+ *  \brief  A variable controlling whether the Android / iOS built-in
+ *  accelerometer should be listed as a joystick device.
+ *
+ *  This variable can be set to the following values:
+ *    "0"       - The accelerometer is not listed as a joystick
+ *    "1"       - The accelerometer is available as a 3 axis joystick (the default).
  */
 #define SDL_HINT_ACCELEROMETER_AS_JOYSTICK "SDL_ACCELEROMETER_AS_JOYSTICK"
 
+/**
+ *  \brief  A variable controlling whether the Android / tvOS remotes
+ *  should be listed as joystick devices, instead of sending keyboard events.
+ *
+ *  This variable can be set to the following values:
+ *    "0"       - Remotes send enter/escape/arrow key events
+ *    "1"       - Remotes are available as 2 axis, 2 button joysticks (the default).
+ */
+#define SDL_HINT_TV_REMOTE_AS_JOYSTICK "SDL_TV_REMOTE_AS_JOYSTICK"
+
 /**
  *  \brief  A variable that lets you disable the detection and use of Xinput gamepad devices
  *
@@ -719,6 +752,18 @@ extern "C" {
  */
 #define SDL_HINT_ANDROID_SEPARATE_MOUSE_AND_TOUCH "SDL_ANDROID_SEPARATE_MOUSE_AND_TOUCH"
 
+ /**
+ * \brief A variable to control whether the return key on the soft keyboard
+ *        should hide the soft keyboard on Android and iOS.
+ *
+ * The variable can be set to the following values:
+ *   "0"       - The return key will be handled as a key event. This is the behaviour of SDL <= 2.0.3. (default)
+ *   "1"       - The return key will hide the keyboard.
+ *
+ * The value of this hint is used at runtime, so it can be changed at any time.
+ */
+#define SDL_HINT_RETURN_KEY_HIDES_IME "SDL_RETURN_KEY_HIDES_IME"
+
 /**
  *  \brief override the binding element for keyboard inputs for Emscripten builds
  *
@@ -752,7 +797,7 @@ extern "C" {
  *   "0"       - SDL will generate a window-close event when it sees Alt+F4.
  *   "1"       - SDL will only do normal key handling for Alt+F4.
  */
-#define SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4	"SDL_WINDOWS_NO_CLOSE_ON_ALT_F4"
+#define SDL_HINT_WINDOWS_NO_CLOSE_ON_ALT_F4 "SDL_WINDOWS_NO_CLOSE_ON_ALT_F4"
 
 /**
  *  \brief Prevent SDL from using version 4 of the bitmap header when saving BMPs.
@@ -797,6 +842,24 @@ extern "C" {
  */
 #define SDL_HINT_RPI_VIDEO_LAYER           "SDL_RPI_VIDEO_LAYER"
 
+/**
+ * \brief Tell the video driver that we only want a double buffer.
+ *
+ * By default, most lowlevel 2D APIs will use a triple buffer scheme that 
+ * wastes no CPU time on waiting for vsync after issuing a flip, but
+ * introduces a frame of latency. On the other hand, using a double buffer
+ * scheme instead is recommended for cases where low latency is an important
+ * factor because we save a whole frame of latency.
+ * We do so by waiting for vsync immediately after issuing a flip, usually just
+ * after eglSwapBuffers call in the backend's *_SwapWindow function.
+ *
+ * Since it's driver-specific, it's only supported where possible and
+ * implemented. Currently supported the following drivers:
+ * - KMSDRM (kmsdrm)
+ * - Raspberry Pi (raspberrypi)
+ */
+#define SDL_HINT_VIDEO_DOUBLE_BUFFER      "SDL_VIDEO_DOUBLE_BUFFER"
+
 /**
  *  \brief  A variable controlling what driver to use for OpenGL ES contexts.
  *