1 files changed, 104 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.MacOS/Renderers/OpenGLViewRenderer.cs b/Xamarin.Forms.Platform.MacOS/Renderers/OpenGLViewRenderer.cs
new file mode 100644
index 00000000..dda6ac50
--- /dev/null
+++ b/Xamarin.Forms.Platform.MacOS/Renderers/OpenGLViewRenderer.cs
@@ -0,0 +1,104 @@
+using System;
+using System.ComponentModel;
+using CoreVideo;
+
+namespace Xamarin.Forms.Platform.MacOS
+{
+	// ReSharper disable once InconsistentNaming
+	internal class OpenGLViewRenderer : ViewRenderer<OpenGLView, MacOSOpenGLView>
+	{
+		CVDisplayLink _displayLink;
+
+		public void Display(object sender, EventArgs eventArgs)
+		{
+			if (Element.HasRenderLoop)
+				return;
+			SetupRenderLoop(true);
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			if (_displayLink != null)
+			{
+				_displayLink.Dispose();
+				_displayLink = null;
+
+				if (Element != null)
+					((IOpenGlViewController)Element).DisplayRequested -= Display;
+			}
+
+			base.Dispose(disposing);
+		}
+
+		protected override void OnElementChanged(ElementChangedEventArgs<OpenGLView> e)
+		{
+			if (e.OldElement != null)
+				((IOpenGlViewController)e.OldElement).DisplayRequested -= Display;
+
+			if (e.NewElement != null)
+			{
+				//var context = new EAGLContext(EAGLRenderingAPI.OpenGLES2);
+				//var glkView = new GLKView(RectangleF.Empty) { Context = context, DrawableDepthFormat = GLKViewDrawableDepthFormat.Format24, Delegate = new Delegate(e.NewElement) };
+				var glkView = new MacOSOpenGLView();
+				SetNativeControl(glkView);
+
+				((IOpenGlViewController)e.NewElement).DisplayRequested += Display;
+
+				SetupRenderLoop(false);
+			}
+
+			base.OnElementChanged(e);
+		}
+
+		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+		{
+			base.OnElementPropertyChanged(sender, e);
+
+			if (e.PropertyName == OpenGLView.HasRenderLoopProperty.PropertyName)
+				SetupRenderLoop(false);
+		}
+
+		void SetupRenderLoop(bool oneShot)
+		{
+			if (_displayLink != null)
+				return;
+			if (!oneShot && !Element.HasRenderLoop)
+				return;
+
+			_displayLink = new CVDisplayLink();
+
+			//.Create(() =>
+			//{
+			//	var control = Control;
+			//	var model = Element;
+			//	if (control != null)
+			//		control.Display();
+			//	if (control == null || model == null || !model.HasRenderLoop)
+			//	{
+			//		_displayLink.Invalidate();
+			//		_displayLink.Dispose();
+			//		_displayLink = null;
+			//	}
+			//});
+			//_displayLink.(NSRunLoop.Current, NSRunLoop.NSDefaultRunLoopMode);
+		}
+
+		//class Delegate : GLKViewDelegate
+		//{
+		//	readonly OpenGLView _model;
+
+		//	public Delegate(OpenGLView model)
+		//	{
+		//		_model = model;
+		//	}
+
+		//	public override void DrawInRect(GLKView view, RectangleF rect)
+		//	{
+		//		var onDisplay = _model.OnDisplay;
+		//		if (onDisplay == null)
+		//			return;
+		//		onDisplay(rect.ToRectangle());
+		//	}
+		//}
+	}
+}
+\ No newline at end of file