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diff --git a/3rdparty/include/SDL2/SDL_touch.h b/3rdparty/include/SDL2/SDL_touch.h
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+++ b/3rdparty/include/SDL2/SDL_touch.h
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+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 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
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/**
+ *  \file SDL_touch.h
+ *
+ *  Include file for SDL touch event handling.
+ */
+
+#ifndef SDL_touch_h_
+#define SDL_touch_h_
+
+#include "SDL_stdinc.h"
+#include "SDL_error.h"
+#include "SDL_video.h"
+
+#include "begin_code.h"
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef Sint64 SDL_TouchID;
+typedef Sint64 SDL_FingerID;
+
+typedef enum
+{
+    SDL_TOUCH_DEVICE_INVALID = -1,
+    SDL_TOUCH_DEVICE_DIRECT,            /* touch screen with window-relative coordinates */
+    SDL_TOUCH_DEVICE_INDIRECT_ABSOLUTE, /* trackpad with absolute device coordinates */
+    SDL_TOUCH_DEVICE_INDIRECT_RELATIVE  /* trackpad with screen cursor-relative coordinates */
+} SDL_TouchDeviceType;
+
+typedef struct SDL_Finger
+{
+    SDL_FingerID id;
+    float x;
+    float y;
+    float pressure;
+} SDL_Finger;
+
+/* Used as the device ID for mouse events simulated with touch input */
+#define SDL_TOUCH_MOUSEID ((Uint32)-1)
+
+/* Used as the SDL_TouchID for touch events simulated with mouse input */
+#define SDL_MOUSE_TOUCHID ((Sint64)-1)
+
+
+/* Function prototypes */
+
+/**
+ *  \brief Get the number of registered touch devices.
+ */
+extern DECLSPEC int SDLCALL SDL_GetNumTouchDevices(void);
+
+/**
+ *  \brief Get the touch ID with the given index, or 0 if the index is invalid.
+ */
+extern DECLSPEC SDL_TouchID SDLCALL SDL_GetTouchDevice(int index);
+
+/**
+ * \brief Get the type of the given touch device.
+ */
+extern DECLSPEC SDL_TouchDeviceType SDLCALL SDL_GetTouchDeviceType(SDL_TouchID touchID);
+
+/**
+ *  \brief Get the number of active fingers for a given touch device.
+ */
+extern DECLSPEC int SDLCALL SDL_GetNumTouchFingers(SDL_TouchID touchID);
+
+/**
+ *  \brief Get the finger object of the given touch, with the given index.
+ */
+extern DECLSPEC SDL_Finger * SDLCALL SDL_GetTouchFinger(SDL_TouchID touchID, int index);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+#include "close_code.h"
+
+#endif /* SDL_touch_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */