1 files changed, 70 insertions, 0 deletions
diff --git a/Xamarin.Forms.Controls/GalleryPages/OpenGLGallery.cs b/Xamarin.Forms.Controls/GalleryPages/OpenGLGallery.cs
new file mode 100644
index 00000000..bb5ce8ab
--- /dev/null
+++ b/Xamarin.Forms.Controls/GalleryPages/OpenGLGallery.cs
@@ -0,0 +1,70 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+#if HAVE_OPENTK
+using OpenTK.Graphics;
+using OpenTK.Graphics.ES20;
+#endif
+
+namespace Xamarin.Forms.Controls
+{
+#if HAVE_OPENTK
+	public class OpenGLGallery : ContentPage
+	{
+		float red, green, blue;
+
+		public OpenGLGallery ()
+		{
+			var view = new OpenGLView {HasRenderLoop = true};
+			var toggle = new Switch {IsToggled = true};
+			var button = new Button {Text = "Display"};
+
+			view.HeightRequest = 300;
+			view.WidthRequest = 300;
+
+			view.OnDisplay = r =>{
+				/*
+				if (!inited) {
+					var shader = GL.CreateShader (All.VertexShader);
+					int length = 0;
+					GL.ShaderSource (shader, 1, new string [] { "void main() { gl_FragColor = vec4(0.6, 1.0, 0.0, 1.0); }"}, ref length);
+					GL.CompileShader (shader);
+					int status = 0;
+					GL.GetShader (shader, All.CompileStatus, ref status);
+					if (status == 0) {
+						GL.DeleteShader (shader);
+						throw new Exception();
+					}
+
+					inited = true;
+				}
+				 */
+				GL.ClearColor (red, green, blue, 1.0f);
+				GL.Clear ((ClearBufferMask.ColorBufferBit | ClearBufferMask.DepthBufferBit));
+
+				red += 0.01f;
+				if (red >= 1.0f)
+					red -= 1.0f;
+				green += 0.02f;
+				if (green >= 1.0f)
+					green -= 1.0f;
+				blue += 0.03f;
+				if (blue >= 1.0f)
+					blue -= 1.0f;
+			};
+
+			toggle.Toggled += (s, a) => { view.HasRenderLoop = toggle.IsToggled; };
+			button.Activated += (s, a) => view.Display ();
+
+			var stack = new StackLayout {Padding = new Size (20, 20)};
+			stack.Add (view);
+			stack.Add (toggle);
+			stack.Add (button);
+
+			Content = stack;
+		}
+	}
+#endif
+}