Add Metal APIs for macOS and iOS (#1394)

binding/Binding/GRBackendRenderTarget.cs

@@ -43,6 +43,21 @@ public GRBackendRenderTarget (int width, int height, int sampleCount, GRVkImageI
 			CreateVulkan (width, height, sampleCount, vkImageInfo);
 		}
 
+#if __IOS__ || __MACOS__
+
+		public GRBackendRenderTarget (int width, int height, int sampleCount, GRMetalTextureInfo mtlInfo)
+			: this (IntPtr.Zero, true)
+		{
+			var info = mtlInfo.ToNative ();
+			Handle = SkiaApi.gr_backendrendertarget_new_metal (width, height, sampleCount, &info);
+
+			if (Handle == IntPtr.Zero) {
+				throw new InvalidOperationException ("Unable to create a new GRBackendRenderTarget instance.");
+			}
+		}
+
+#endif
+
 		private void CreateGl (int width, int height, int sampleCount, int stencilBits, GRGlFramebufferInfo glInfo)
 		{
 			Handle = SkiaApi.gr_backendrendertarget_new_gl (width, height, sampleCount, stencilBits, &glInfo);

binding/Binding/GRBackendTexture.cs

@@ -47,6 +47,21 @@ public GRBackendTexture (int width, int height, GRVkImageInfo vkInfo)
 			CreateVulkan (width, height, vkInfo);
 		}
 
+#if __IOS__ || __MACOS__
+
+		public GRBackendTexture (int width, int height, bool mipmapped, GRMetalTextureInfo mtlInfo)
+			: this (IntPtr.Zero, true)
+		{
+			var info = mtlInfo.ToNative ();
+			Handle = SkiaApi.gr_backendtexture_new_metal (width, height, mipmapped, &info);
+
+			if (Handle == IntPtr.Zero) {
+				throw new InvalidOperationException ("Unable to create a new GRBackendTexture instance.");
+			}
+		}
+
+#endif
+
 		private void CreateGl (int width, int height, bool mipmapped, GRGlTextureInfo glInfo)
 		{
 			Handle = SkiaApi.gr_backendtexture_new_gl (width, height, mipmapped, &glInfo);

binding/Binding/GRContext.cs

@@ -69,6 +69,22 @@ public static GRContext CreateVulkan (GRVkBackendContext backendContext)
 			return GetObject (SkiaApi.gr_context_make_vulkan (backendContext.ToNative ()));
 		}
 
+#if __IOS__ || __MACOS__
+
+		// CreateMetal
+
+		public static GRContext CreateMetal (Metal.IMTLDevice device, Metal.IMTLCommandQueue queue)
+		{
+			if (device == null)
+				throw new ArgumentNullException (nameof (device));
+			if (queue == null)
+				throw new ArgumentNullException (nameof (queue));
+
+			return GetObject (SkiaApi.gr_context_make_metal ((void*)device.Handle, (void*)queue.Handle));
+		}
+
+#endif
+
 		//
 
 		public GRBackend Backend => SkiaApi.gr_context_get_backend (Handle).FromNative ();

binding/Binding/GRDefinitions.cs

@@ -110,6 +110,44 @@ public GRGlTextureInfo (uint target, uint id, uint format)
 		}
 	}
 
+#if __IOS__ || __MACOS__
+
+	public unsafe partial struct GRMetalTextureInfo
+	{
+		public GRMetalTextureInfo (Metal.IMTLTexture texture)
+		{
+			Texture = texture;
+		}
+
+		public Metal.IMTLTexture Texture { get; set; }
+
+		internal GRMetalTextureInfoNative ToNative () =>
+			new GRMetalTextureInfoNative {
+				fTexture = (void*)Texture.Handle
+			};
+
+		public readonly bool Equals (GRMetalTextureInfo obj) =>
+			Texture == obj.Texture;
+
+		public readonly override bool Equals (object obj) =>
+			obj is GRMetalTextureInfo f && Equals (f);
+
+		public static bool operator == (GRMetalTextureInfo left, GRMetalTextureInfo right) =>
+			left.Equals (right);
+
+		public static bool operator != (GRMetalTextureInfo left, GRMetalTextureInfo right) =>
+			!left.Equals (right);
+
+		public readonly override int GetHashCode ()
+		{
+			var hash = new HashCode ();
+			hash.Add (Texture);
+			return hash.ToHashCode ();
+		}
+	}
+
+#endif
+
 	[EditorBrowsable (EditorBrowsableState.Never)]
 	[Flags]
 	[Obsolete]

binding/Binding/SKSurface.cs

@@ -284,6 +284,24 @@ public static SKSurface Create (GRContext context, bool budgeted, SKImageInfo in
 			return GetObject (SkiaApi.sk_surface_new_render_target (context.Handle, budgeted, &cinfo, sampleCount, origin, props?.Handle ?? IntPtr.Zero, shouldCreateWithMips));
 		}
 
+#if __MACOS__ || __IOS__
+
+		public static SKSurface Create (GRContext context, CoreAnimation.CAMetalLayer layer, GRSurfaceOrigin origin, int sampleCount, SKColorType colorType, out CoreAnimation.ICAMetalDrawable drawable) =>
+			Create (context, layer, origin, sampleCount, colorType, null, null, out drawable);
+
+		public static SKSurface Create (GRContext context, CoreAnimation.CAMetalLayer layer, GRSurfaceOrigin origin, int sampleCount, SKColorType colorType, SKColorSpace colorspace, out CoreAnimation.ICAMetalDrawable drawable) =>
+			Create (context, layer, origin, sampleCount, colorType, colorspace, null, out drawable);
+
+		public static SKSurface Create (GRContext context, CoreAnimation.CAMetalLayer layer, GRSurfaceOrigin origin, int sampleCount, SKColorType colorType, SKColorSpace colorspace, SKSurfaceProperties props, out CoreAnimation.ICAMetalDrawable drawable)
+		{
+			void* drawablePtr;
+			var surface = GetObject (SkiaApi.sk_surface_new_metal_layer (context.Handle, (void*)layer.Handle, origin, sampleCount, colorType.ToNative (), colorspace?.Handle ?? IntPtr.Zero, props?.Handle ?? IntPtr.Zero, &drawablePtr));
+			drawable = ObjCRuntime.Runtime.GetINativeObject<CoreAnimation.ICAMetalDrawable> ((IntPtr)drawablePtr, true);
+			return surface;
+		}
+
+#endif
+
 		// NULL surface
 
 		public static SKSurface CreateNull (int width, int height) =>
@@ -354,6 +372,9 @@ public bool ReadPixels (SKImageInfo dstInfo, IntPtr dstPixels, int dstRowBytes,
 			return result;
 		}
 
+		public void Flush () =>
+			SkiaApi.sk_surface_flush (Handle);
+
 		internal static SKSurface GetObject (IntPtr handle) =>
 			handle == IntPtr.Zero ? null : new SKSurface (handle, true);
 	}

binding/Binding/SkiaApi.generated.cs

@@ -221,6 +221,20 @@ private partial class Delegates {
 			(gr_backendrendertarget_new_gl_delegate ??= GetSymbol<Delegates.gr_backendrendertarget_new_gl> ("gr_backendrendertarget_new_gl")).Invoke (width, height, samples, stencils, glInfo);
 		#endif
 
+		// gr_backendrendertarget_t* gr_backendrendertarget_new_metal(int width, int height, int samples, const gr_mtl_textureinfo_t* mtlInfo)
+		#if !USE_DELEGATES
+		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
+		internal static extern gr_backendrendertarget_t gr_backendrendertarget_new_metal (Int32 width, Int32 height, Int32 samples, GRMetalTextureInfoNative* mtlInfo);
+		#else
+		private partial class Delegates {
+			[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
+			internal delegate gr_backendrendertarget_t gr_backendrendertarget_new_metal (Int32 width, Int32 height, Int32 samples, GRMetalTextureInfoNative* mtlInfo);
+		}
+		private static Delegates.gr_backendrendertarget_new_metal gr_backendrendertarget_new_metal_delegate;
+		internal static gr_backendrendertarget_t gr_backendrendertarget_new_metal (Int32 width, Int32 height, Int32 samples, GRMetalTextureInfoNative* mtlInfo) =>
+			(gr_backendrendertarget_new_metal_delegate ??= GetSymbol<Delegates.gr_backendrendertarget_new_metal> ("gr_backendrendertarget_new_metal")).Invoke (width, height, samples, mtlInfo);
+		#endif
+
 		// gr_backendrendertarget_t* gr_backendrendertarget_new_vulkan(int width, int height, int samples, const gr_vk_imageinfo_t* vkImageInfo)
 		#if !USE_DELEGATES
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
@@ -353,6 +367,20 @@ private partial class Delegates {
 			(gr_backendtexture_new_gl_delegate ??= GetSymbol<Delegates.gr_backendtexture_new_gl> ("gr_backendtexture_new_gl")).Invoke (width, height, mipmapped, glInfo);
 		#endif
 
+		// gr_backendtexture_t* gr_backendtexture_new_metal(int width, int height, bool mipmapped, const gr_mtl_textureinfo_t* mtlInfo)
+		#if !USE_DELEGATES
+		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
+		internal static extern gr_backendtexture_t gr_backendtexture_new_metal (Int32 width, Int32 height, [MarshalAs (UnmanagedType.I1)] bool mipmapped, GRMetalTextureInfoNative* mtlInfo);
+		#else
+		private partial class Delegates {
+			[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
+			internal delegate gr_backendtexture_t gr_backendtexture_new_metal (Int32 width, Int32 height, [MarshalAs (UnmanagedType.I1)] bool mipmapped, GRMetalTextureInfoNative* mtlInfo);
+		}
+		private static Delegates.gr_backendtexture_new_metal gr_backendtexture_new_metal_delegate;
+		internal static gr_backendtexture_t gr_backendtexture_new_metal (Int32 width, Int32 height, [MarshalAs (UnmanagedType.I1)] bool mipmapped, GRMetalTextureInfoNative* mtlInfo) =>
+			(gr_backendtexture_new_metal_delegate ??= GetSymbol<Delegates.gr_backendtexture_new_metal> ("gr_backendtexture_new_metal")).Invoke (width, height, mipmapped, mtlInfo);
+		#endif
+
 		// gr_backendtexture_t* gr_backendtexture_new_vulkan(int width, int height, const gr_vk_imageinfo_t* vkInfo)
 		#if !USE_DELEGATES
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
@@ -493,6 +521,20 @@ private partial class Delegates {
 			(gr_context_make_gl_delegate ??= GetSymbol<Delegates.gr_context_make_gl> ("gr_context_make_gl")).Invoke (glInterface);
 		#endif
 
+		// gr_context_t* gr_context_make_metal(void* device, void* queue)
+		#if !USE_DELEGATES
+		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
+		internal static extern gr_context_t gr_context_make_metal (void* device, void* queue);
+		#else
+		private partial class Delegates {
+			[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
+			internal delegate gr_context_t gr_context_make_metal (void* device, void* queue);
+		}
+		private static Delegates.gr_context_make_metal gr_context_make_metal_delegate;
+		internal static gr_context_t gr_context_make_metal (void* device, void* queue) =>
+			(gr_context_make_metal_delegate ??= GetSymbol<Delegates.gr_context_make_metal> ("gr_context_make_metal")).Invoke (device, queue);
+		#endif
+
 		// gr_context_t* gr_context_make_vulkan(const gr_vk_backendcontext_t vkBackendContext)
 		#if !USE_DELEGATES
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
@@ -11429,6 +11471,20 @@ private partial class Delegates {
 			(sk_surface_draw_delegate ??= GetSymbol<Delegates.sk_surface_draw> ("sk_surface_draw")).Invoke (surface, canvas, x, y, paint);
 		#endif
 
+		// void sk_surface_flush(sk_surface_t* surface)
+		#if !USE_DELEGATES
+		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
+		internal static extern void sk_surface_flush (sk_surface_t surface);
+		#else
+		private partial class Delegates {
+			[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
+			internal delegate void sk_surface_flush (sk_surface_t surface);
+		}
+		private static Delegates.sk_surface_flush sk_surface_flush_delegate;
+		internal static void sk_surface_flush (sk_surface_t surface) =>
+			(sk_surface_flush_delegate ??= GetSymbol<Delegates.sk_surface_flush> ("sk_surface_flush")).Invoke (surface);
+		#endif
+
 		// sk_canvas_t* sk_surface_get_canvas(sk_surface_t*)
 		#if !USE_DELEGATES
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
@@ -11527,6 +11583,20 @@ private partial class Delegates {
 			(sk_surface_new_image_snapshot_with_crop_delegate ??= GetSymbol<Delegates.sk_surface_new_image_snapshot_with_crop> ("sk_surface_new_image_snapshot_with_crop")).Invoke (surface, bounds);
 		#endif
 
+		// sk_surface_t* sk_surface_new_metal_layer(gr_context_t* context, const void* layer, gr_surfaceorigin_t origin, int sampleCount, sk_colortype_t colorType, sk_colorspace_t* colorspace, const sk_surfaceprops_t* props, const void** drawable)
+		#if !USE_DELEGATES
+		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
+		internal static extern sk_surface_t sk_surface_new_metal_layer (gr_context_t context, void* layer, GRSurfaceOrigin origin, Int32 sampleCount, SKColorTypeNative colorType, sk_colorspace_t colorspace, sk_surfaceprops_t props, void** drawable);
+		#else
+		private partial class Delegates {
+			[UnmanagedFunctionPointer (CallingConvention.Cdecl)]
+			internal delegate sk_surface_t sk_surface_new_metal_layer (gr_context_t context, void* layer, GRSurfaceOrigin origin, Int32 sampleCount, SKColorTypeNative colorType, sk_colorspace_t colorspace, sk_surfaceprops_t props, void** drawable);
+		}
+		private static Delegates.sk_surface_new_metal_layer sk_surface_new_metal_layer_delegate;
+		internal static sk_surface_t sk_surface_new_metal_layer (gr_context_t context, void* layer, GRSurfaceOrigin origin, Int32 sampleCount, SKColorTypeNative colorType, sk_colorspace_t colorspace, sk_surfaceprops_t props, void** drawable) =>
+			(sk_surface_new_metal_layer_delegate ??= GetSymbol<Delegates.sk_surface_new_metal_layer> ("sk_surface_new_metal_layer")).Invoke (context, layer, origin, sampleCount, colorType, colorspace, props, drawable);
+		#endif
+
 		// sk_surface_t* sk_surface_new_null(int width, int height)
 		#if !USE_DELEGATES
 		[DllImport (SKIA, CallingConvention = CallingConvention.Cdecl)]
@@ -13262,6 +13332,33 @@ public unsafe partial struct GRGlTextureInfo : IEquatable<GRGlTextureInfo> {
 
 	}
 
+	// gr_mtl_textureinfo_t
+	[StructLayout (LayoutKind.Sequential)]
+	internal unsafe partial struct GRMetalTextureInfoNative : IEquatable<GRMetalTextureInfoNative> {
+		// public const void* fTexture
+		public void* fTexture;
+
+		public readonly bool Equals (GRMetalTextureInfoNative obj) =>
+			fTexture == obj.fTexture;
+
+		public readonly override bool Equals (object obj) =>
+			obj is GRMetalTextureInfoNative f && Equals (f);
+
+		public static bool operator == (GRMetalTextureInfoNative left, GRMetalTextureInfoNative right) =>
+			left.Equals (right);
+
+		public static bool operator != (GRMetalTextureInfoNative left, GRMetalTextureInfoNative right) =>
+			!left.Equals (right);
+
+		public readonly override int GetHashCode ()
+		{
+			var hash = new HashCode ();
+			hash.Add (fTexture);
+			return hash.ToHashCode ();
+		}
+
+	}
+
 	// gr_vk_alloc_t
 	[StructLayout (LayoutKind.Sequential)]
 	public unsafe partial struct GRVkAlloc : IEquatable<GRVkAlloc> {

binding/libSkiaSharp.json

@@ -69,6 +69,10 @@
         "cs": "GRVkBackendContextNative",
         "internal": true
       },
+      "gr_mtl_textureinfo_t": {
+        "cs": "GRMetalTextureInfoNative",
+        "internal": true
+      },
       "sk_color4f_t": {
         "cs": "SKColorF",
         "readonly": true,

native/ios/build.cake

@@ -31,6 +31,7 @@ Task("libSkiaSharp")
             $"target_cpu='{skiaArch}' " +
             $"target_os='ios' " +
             $"skia_use_icu=false " +
+            $"skia_use_metal=true " +
             $"skia_use_piex=true " +
             $"skia_use_sfntly=false " +
             $"skia_use_system_expat=false " +

native/ios/libSkiaSharp/libSkiaSharp.xcodeproj/project.pbxproj

@@ -14,6 +14,9 @@
 		345A7E581E7635B10046F543 /* CoreGraphics.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 345A7E571E7635B10046F543 /* CoreGraphics.framework */; };
 		345A7E5A1E7635B50046F543 /* CoreFoundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 345A7E591E7635B50046F543 /* CoreFoundation.framework */; };
 		345A7E5C1E7635B90046F543 /* CoreText.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 345A7E5B1E7635B90046F543 /* CoreText.framework */; };
+		34AC596F24B80BAD009CDA1D /* Foundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 34AC596E24B80BAD009CDA1D /* Foundation.framework */; };
+		34AC597224B80BB4009CDA1D /* MetalKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 34AC597024B80BB4009CDA1D /* MetalKit.framework */; };
+		34AC597324B80BB4009CDA1D /* Metal.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 34AC597124B80BB4009CDA1D /* Metal.framework */; };
 		34B07C3A24EF0BE700FE3EC9 /* sk_managedtracememorydump.h in Headers */ = {isa = PBXBuildFile; fileRef = 34B07C3624EF0BE700FE3EC9 /* sk_managedtracememorydump.h */; };
 		34B07C3B24EF0BE700FE3EC9 /* SkManagedTraceMemoryDump.h in Headers */ = {isa = PBXBuildFile; fileRef = 34B07C3724EF0BE700FE3EC9 /* SkManagedTraceMemoryDump.h */; };
 		34B07C3C24EF0BE700FE3EC9 /* SkManagedTraceMemoryDump.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 34B07C3824EF0BE700FE3EC9 /* SkManagedTraceMemoryDump.cpp */; };
@@ -44,6 +47,9 @@
 		345A7E571E7635B10046F543 /* CoreGraphics.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreGraphics.framework; path = System/Library/Frameworks/CoreGraphics.framework; sourceTree = SDKROOT; };
 		345A7E591E7635B50046F543 /* CoreFoundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreFoundation.framework; path = System/Library/Frameworks/CoreFoundation.framework; sourceTree = SDKROOT; };
 		345A7E5B1E7635B90046F543 /* CoreText.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreText.framework; path = System/Library/Frameworks/CoreText.framework; sourceTree = SDKROOT; };
+		34AC596E24B80BAD009CDA1D /* Foundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Foundation.framework; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/Foundation.framework; sourceTree = DEVELOPER_DIR; };
+		34AC597024B80BB4009CDA1D /* MetalKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = MetalKit.framework; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/MetalKit.framework; sourceTree = DEVELOPER_DIR; };
+		34AC597124B80BB4009CDA1D /* Metal.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = Metal.framework; path = Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.15.sdk/System/Library/Frameworks/Metal.framework; sourceTree = DEVELOPER_DIR; };
 		34B07C3624EF0BE700FE3EC9 /* sk_managedtracememorydump.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = sk_managedtracememorydump.h; path = ../../../../externals/skia/include/xamarin/sk_managedtracememorydump.h; sourceTree = "<group>"; };
 		34B07C3724EF0BE700FE3EC9 /* SkManagedTraceMemoryDump.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; name = SkManagedTraceMemoryDump.h; path = ../../../../externals/skia/include/xamarin/SkManagedTraceMemoryDump.h; sourceTree = "<group>"; };
 		34B07C3824EF0BE700FE3EC9 /* SkManagedTraceMemoryDump.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; name = SkManagedTraceMemoryDump.cpp; path = ../../../../externals/skia/src/xamarin/SkManagedTraceMemoryDump.cpp; sourceTree = "<group>"; };
@@ -72,6 +78,9 @@
 				345A7E5C1E7635B90046F543 /* CoreText.framework in Frameworks */,
 				345A7E5A1E7635B50046F543 /* CoreFoundation.framework in Frameworks */,
 				345A7E581E7635B10046F543 /* CoreGraphics.framework in Frameworks */,
+				34AC597224B80BB4009CDA1D /* MetalKit.framework in Frameworks */,
+				34AC597324B80BB4009CDA1D /* Metal.framework in Frameworks */,
+				34AC596F24B80BAD009CDA1D /* Foundation.framework in Frameworks */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -129,6 +138,9 @@
 		345A7E561E7635B00046F543 /* Frameworks */ = {
 			isa = PBXGroup;
 			children = (
+				34AC597124B80BB4009CDA1D /* Metal.framework */,
+				34AC597024B80BB4009CDA1D /* MetalKit.framework */,
+				34AC596E24B80BAD009CDA1D /* Foundation.framework */,
 				345A7E5B1E7635B90046F543 /* CoreText.framework */,
 				345A7E591E7635B50046F543 /* CoreFoundation.framework */,
 				345A7E571E7635B10046F543 /* CoreGraphics.framework */,

native/macos/build.cake

@@ -23,15 +23,16 @@ Task("libSkiaSharp")
             $"target_os='mac' " +
             $"target_cpu='{skiaArch}' " +
             $"skia_use_icu=false " +
+            $"skia_use_metal=true " +
             $"skia_use_piex=true " +
             $"skia_use_sfntly=false " +
             $"skia_use_system_expat=false " +
             $"skia_use_system_libjpeg_turbo=false " +
             $"skia_use_system_libpng=false " +
             $"skia_use_system_libwebp=false " +
             $"skia_use_system_zlib=false " +
-            $"extra_cflags=[ '-DSKIA_C_DLL', '-DHAVE_ARC4RANDOM_BUF', '-mmacosx-version-min=10.7', '-stdlib=libc++' ] " +
-            $"extra_ldflags=[ '-Wl,macosx_version_min=10.7', '-stdlib=libc++' ]");
+            $"extra_cflags=[ '-DSKIA_C_DLL', '-DHAVE_ARC4RANDOM_BUF', '-mmacosx-version-min=10.8', '-stdlib=libc++' ] " +
+            $"extra_ldflags=[ '-Wl,macosx_version_min=10.8', '-stdlib=libc++' ]");
 
         RunXCodeBuild("libSkiaSharp/libSkiaSharp.xcodeproj", "libSkiaSharp", "macosx", arch);