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diff --git a/Source/external/SDL2/src/video/uikit/SDL_uikitmetalview.h b/Source/external/SDL2/src/video/uikit/SDL_uikitmetalview.h
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+++ b/Source/external/SDL2/src/video/uikit/SDL_uikitmetalview.h
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+/*
+ Simple DirectMedia Layer
+ 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
+ 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.
+ */
+
+/*
+ * @author Mark Callow, www.edgewise-consulting.com.
+ *
+ * Thanks to Alex Szpakowski, @slime73 on GitHub, for his gist showing
+ * how to add a CAMetalLayer backed view.
+ */
+
+#ifndef SDL_uikitmetalview_h_
+#define SDL_uikitmetalview_h_
+
+#import "../SDL_sysvideo.h"
+#import "SDL_uikitwindow.h"
+
+#if SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN)
+
+#import <UIKit/UIKit.h>
+#import <Metal/Metal.h>
+#import <QuartzCore/CAMetalLayer.h>
+
+#define METALVIEW_TAG 255
+
+@interface SDL_uikitmetalview : SDL_uikitview
+
+- (instancetype)initWithFrame:(CGRect)frame
+                        scale:(CGFloat)scale;
+
+@end
+
+SDL_uikitmetalview* UIKit_Mtl_AddMetalView(SDL_Window* window);
+
+void UIKit_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h);
+
+#endif /* SDL_VIDEO_DRIVER_UIKIT && (SDL_VIDEO_RENDER_METAL || SDL_VIDEO_VULKAN) */
+
+#endif /* SDL_uikitmetalview_h_ */
+
+/* vi: set ts=4 sw=4 expandtab: */