From 30752ed36d4c8dd8cf85817834565071568075bf Mon Sep 17 00:00:00 2001
From: Armin Sander <armin@replicator.org>
Date: Sat, 18 Mar 2017 14:06:27 +0100
Subject: [PATCH] ANGLE: keep the backbuffer size updated when the window
 resizes

---
 src/OpenTK/Platform/Egl/EglContext.cs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/OpenTK/Platform/Egl/EglContext.cs b/src/OpenTK/Platform/Egl/EglContext.cs
index b6cca8f..c45ad7b 100644
--- a/src/OpenTK/Platform/Egl/EglContext.cs
+++ b/src/OpenTK/Platform/Egl/EglContext.cs
@@ -171,6 +171,18 @@ namespace OpenTK.Platform.Egl
             }
         }
 
+        public override void Update(IWindowInfo window)
+        {
+            // ANGLE updates the width and height of the back buffer surfaces in the WaitClient function.
+            // So without this calling this function, the surface won't match the size of the window after it 
+            // was resized.
+            // https://bugs.chromium.org/p/angleproject/issues/detail?id=1438
+            if (!Egl.WaitClient())
+            {
+                Debug.Print("[Warning] Egl.WaitClient() failed. Error: {0}", Egl.GetError());
+            }
+        }
+
         #endregion
 
         #region IGraphicsContextInternal Members
-- 
2.7.4