1 files changed, 135 insertions, 0 deletions
diff --git a/Source/3rdParty/SDL2/src/video/cocoa/SDL_cocoametalview.m b/Source/3rdParty/SDL2/src/video/cocoa/SDL_cocoametalview.m
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index 0000000..e9c08a0
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+++ b/Source/3rdParty/SDL2/src/video/cocoa/SDL_cocoametalview.m
@@ -0,0 +1,135 @@
+/*
+  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.
+ */
+
+#import "SDL_cocoametalview.h"
+
+#if SDL_VIDEO_DRIVER_COCOA && (SDL_VIDEO_VULKAN || SDL_VIDEO_RENDER_METAL)
+
+#include "SDL_assert.h"
+
+@implementation SDL_cocoametalview
+
+/* The synthesized getter should be called by super's viewWithTag. */
+@synthesize tag = _tag;
+
+/* Return a Metal-compatible layer. */
++ (Class)layerClass
+{
+	return NSClassFromString(@"CAMetalLayer");
+}
+
+/* Indicate the view wants to draw using a backing layer instead of drawRect. */
+- (BOOL)wantsUpdateLayer
+{
+    return YES;
+}
+
+/* When the wantsLayer property is set to YES, this method will be invoked to
+ * return a layer instance.
+ */
+- (CALayer*)makeBackingLayer
+{
+    return [self.class.layerClass layer];
+}
+
+- (instancetype)initWithFrame:(NSRect)frame
+                        scale:(CGFloat)scale
+{
+	if ((self = [super initWithFrame:frame])) {
+        _tag = METALVIEW_TAG;
+        self.wantsLayer = YES;
+
+        /* Allow resize. */
+        self.autoresizingMask = NSViewWidthSizable | NSViewHeightSizable;
+
+        /* Set the desired scale. The default drawableSize of a CAMetalLayer
+         * is its bounds x its scale so nothing further needs to be done.
+         */
+        self.layer.contentsScale = scale;
+	}
+  
+	return self;
+}
+
+/* Set the size of the metal drawables when the view is resized. */
+- (void)resizeWithOldSuperviewSize:(NSSize)oldSize
+{
+    [super resizeWithOldSuperviewSize:oldSize];
+}
+
+@end
+
+SDL_cocoametalview*
+Cocoa_Mtl_AddMetalView(SDL_Window* window)
+{
+    SDL_WindowData* data = (__bridge SDL_WindowData *)window->driverdata;
+    NSView *view = data->nswindow.contentView;
+    CGFloat scale = 1.0;
+
+    if (window->flags & SDL_WINDOW_ALLOW_HIGHDPI) {
+        /* Set the scale to the natural scale factor of the screen - then
+         * the backing dimensions of the Metal view will match the pixel
+         * dimensions of the screen rather than the dimensions in points
+         * yielding high resolution on retine displays.
+         *
+         * N.B. In order for backingScaleFactor to be > 1,
+         * NSHighResolutionCapable must be set to true in the app's Info.plist.
+         */
+        NSWindow* nswindow = data->nswindow;
+        if ([nswindow.screen respondsToSelector:@selector(backingScaleFactor)])
+            scale = data->nswindow.screen.backingScaleFactor;
+    }
+        
+    SDL_cocoametalview *metalview
+        = [[SDL_cocoametalview alloc] initWithFrame:view.frame scale:scale];
+    [view addSubview:metalview];
+    return metalview;
+}
+
+void
+Cocoa_Mtl_GetDrawableSize(SDL_Window * window, int * w, int * h)
+{
+    SDL_WindowData *data = (__bridge SDL_WindowData *)window->driverdata;
+    NSView *view = data->nswindow.contentView;
+    SDL_cocoametalview* metalview = [view viewWithTag:METALVIEW_TAG];
+    if (metalview) {
+        CAMetalLayer *layer = (CAMetalLayer*)metalview.layer;
+        assert(layer != NULL);
+        if (w) {
+            *w = layer.drawableSize.width;
+        }
+        if (h) {
+            *h = layer.drawableSize.height;
+        }
+    } else {
+        SDL_GetWindowSize(window, w, h);
+    }
+}
+
+#endif /* SDL_VIDEO_DRIVER_COCOA && (SDL_VIDEO_VULKAN || SDL_VIDEO_RENDER_METAL) */
+
+/* vi: set ts=4 sw=4 expandtab: */