Automatic OpenGL error checking now throws an OpenGLErrorException. This is internal, as it should not be caught by the user.

Added Color4 overload to GL.Uniform4.

Source/OpenTK/Graphics/GL/GLHelper.cs

@@ -913,6 +913,11 @@ namespace OpenTK.Graphics
             }
         }
 
+        public static void Uniform4(int location, Color4 color)
+        {
+            unsafe { GL.Uniform4(location, 4, &color.R); }
+        }
+
         #endregion
 
         #endregion

Source/OpenTK/Graphics/GraphicsContext.cs

@@ -281,10 +281,7 @@ namespace OpenTK.Graphics
                     }
                     sb.Remove(sb.Length - 2, 2); // Remove the last comma
 
-                    Debug.Print(String.Format("OpenGL error(s) detected: {0}", sb.ToString()));
+                    throw new OpenGLErrorException(sb.ToString());
-                    Debug.Indent();
-                    Debug.WriteLine(new StackTrace(true).ToString());
-                    Debug.Unindent();
                 }
             }
         }
@@ -533,4 +530,18 @@ namespace OpenTK.Graphics
     }
 
     #endregion
+
+    #region class GraphicsErrorException : GraphicsException
+
+    // This is private by design. These exceptions are only thrown in debug builds of
+    // OpenTK and the user should *not* handle them.
+    // If some specific OpenGL error is generated by design, the user should
+    // turn off automatic error checking for that portion of the code, using
+    // 'GraphicsContext.ErrorChecking = false'.
+    class OpenGLErrorException : GraphicsException
+    {
+        public OpenGLErrorException(string message) : base(message) { }
+    }
+
+    #endregion
 }