3 files changed, 43 insertions, 10 deletions
diff --git a/Drawing2D/src/Enums.cs b/Drawing2D/src/Enums.cs
index 12a6f035..bf20a432 100644
--- a/Drawing2D/src/Enums.cs
+++ b/Drawing2D/src/Enums.cs
@@ -6,6 +6,12 @@ using System;
 
 namespace Drawing2D
 {
+	public enum BackendType {
+		Native,
+		OpenGL,
+		EGL,
+		Vulkan
+	}
 	public enum Status
 	{
 		Success = 0,
diff --git a/Drawing2D/src/IBackend.cs b/Drawing2D/src/IBackend.cs
new file mode 100644
index 00000000..811b95d5
--- /dev/null
+++ b/Drawing2D/src/IBackend.cs
@@ -0,0 +1,37 @@
+// Copyright (c) 2018-2021  Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
+//
+// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
+
+using System;
+using System.IO;
+
+namespace Drawing2D
+{
+	public interface IBackend: IDisposable
+	{
+		ISurface CreateSurface (int width, int height);
+		ISurface CreateSurface (byte[] data, int width, int height);
+		//ISurface CreateMainSurface (IntPtr glfwWinHandle, int width, int height);
+		ISurface MainSurface { get; }
+		IRegion CreateRegion ();
+		IContext CreateContext (ISurface surf);
+		//IPattern CreatePattern (PatternType patternType);
+		IGradient CreateGradient (GradientType gradientType, Rectangle bounds);
+		byte[] LoadBitmap (Stream stream, out Size dimensions);
+		ISvgHandle LoadSvg (Stream stream);
+		ISvgHandle LoadSvg (string svgFragment);
+		IContext PrepareUIFrame (IContext existingContext, IRegion clipping);
+		void FlushUIFrame (IContext ctx);
+		/*IRegion CreateRegion ();
+		ISurface CreateSurface (int width, int height);
+		ISurface CreateSurface (byte[] data, int width, int height);
+		ISurface CreateSurface (IntPtr glfwWinHandle, int width, int height);
+		IContext CreateContext (ISurface surf);
+		//IPattern CreatePattern (PatternType patternType);
+		IGradient CreateGradient (GradientType gradientType, Rectangle bounds);
+		byte[] LoadBitmap (Stream stream, out Size dimensions);
+		ISvgHandle LoadSvg (Stream stream);
+		ISvgHandle LoadSvg (string svgFragment);*/
+	}
+}
+
diff --git a/Drawing2D/src/IDevice.cs b/Drawing2D/src/IDevice.cs
index 891f8b2e..14846271 100644
--- a/Drawing2D/src/IDevice.cs
+++ b/Drawing2D/src/IDevice.cs
@@ -13,16 +13,6 @@ namespace Drawing2D
 
 		void GetDpy (out int hdpy, out int vdpy);
 		void SetDpy (int hdpy, int vdpy);
-		IRegion CreateRegion ();
-		ISurface CreateSurface (int width, int height);
-		ISurface CreateSurface (byte[] data, int width, int height);
-		ISurface CreateSurface (IntPtr glfwWinHandle, int width, int height);
-		IContext CreateContext (ISurface surf);
-		//IPattern CreatePattern (PatternType patternType);
-		IGradient CreateGradient (GradientType gradientType, Rectangle bounds);
-		byte[] LoadBitmap (Stream stream, out Size dimensions);
-		ISvgHandle LoadSvg (Stream stream);
-		ISvgHandle LoadSvg (string svgFragment);
 	}
 }