The generator now detects and adds the FlagsAttribute to bitwise collections. Fixes bug [#792] "Resharper - Bitwise operation on enum which is not marked by [Flags] attribute" (http://www.opentk.com/node/792).

Source/Bind/GL2/Generator.cs

@@ -466,6 +466,10 @@ namespace Bind.GL2
             using (BindStreamWriter sw = new BindStreamWriter(Path.Combine(Settings.OutputPath, enumsFile)))
             {
                 WriteLicense(sw);
+                
+                sw.WriteLine("using System;");
+                sw.WriteLine();
+
                 if ((Settings.Compatibility & Settings.Legacy.NestedEnums) != Settings.Legacy.None)
                 {
                     sw.WriteLine("namespace {0}", Settings.OutputNamespace);

Source/Bind/Structures/Constant.cs

@@ -51,16 +51,6 @@ namespace Bind.Structures
         {
             get 
             {
-                //if (String.IsNullOrEmpty(Reference))
-                //    return _value;
-                //else
-                //{
-                //    Enum @ref;
-                //    if (Enum.GLEnums.TryGetValue(Reference, out @ref) || Enum.AuxEnums.TryGetValue(Reference, out @ref))
-                //        if (@ref.ConstantCollection.ContainsKey(_value))
-                //            return (@ref.ConstantCollection[_value] as Constant).Value;
-                //}
-
                 return _value;
             }
             set

Source/Bind/Structures/Enum.cs

@@ -8,6 +8,7 @@ using System;
 using System.Collections.Generic;
 using System.Text;
 using System.IO;
+using System.Globalization;
 
 namespace Bind.Structures
 {
@@ -77,6 +78,20 @@ namespace Bind.Structures
 
         #endregion
 
+        #region Public Members
+
+        // Returns true if the enum contains a collection of flags, i.e. 1, 2, 4, 8, ...
+        public bool IsFlagCollection
+        {
+            get
+            {
+                // It seems that all flag collections contain "Mask" in their names.
+                // This looks like a heuristic, but it holds 100% in practice
+                // (checked all enums to make sure).
+                return Name.Contains("Mask");
+            }
+        }
+
         #region public string Name
 
         public string Name
@@ -87,14 +102,19 @@ namespace Bind.Structures
 
         #endregion
 
+        #region ConstantCollection
+
         Dictionary<string, Constant> _constant_collection = new Dictionary<string, Constant>();
 
         public IDictionary<string, Constant> ConstantCollection
         {
             get { return _constant_collection; }
-            //set { _constant_collection = value; }
         }
 
+        #endregion
+
+        #region TranslateName
+
         public static string TranslateName(string name)
         {
             if (Utilities.Keywords.Contains(name))
@@ -137,6 +157,10 @@ namespace Bind.Structures
             return translator.ToString();
         }
 
+        #endregion
+
+        #region ToString
+
         public override string ToString()
         {
             StringBuilder sb = new StringBuilder();
@@ -149,6 +173,8 @@ namespace Bind.Structures
                 return ret;
             });
 
+            if (IsFlagCollection)
+                sb.AppendLine("[Flags]");
             sb.AppendLine("public enum " + Name);
             sb.AppendLine("{");
 
@@ -163,6 +189,10 @@ namespace Bind.Structures
 
             return sb.ToString();
         }
+
+        #endregion
+
+        #endregion
     }
 
     #endregion

Source/OpenTK/Graphics/GL/GLEnums.cs

@@ -25,6 +25,8 @@
 //
 #endregion
 
+using System;
+
 namespace OpenTK.Graphics
 {
     #pragma warning disable 1591
@@ -43,6 +45,7 @@ namespace OpenTK.Graphics
         UnsignedInt = ((int)0X1405),
     }
 
+    [Flags]
     public enum AttribMask
     {
         CurrentBit = ((int)0X00000001),
@@ -69,6 +72,7 @@ namespace OpenTK.Graphics
         AllAttribBits = unchecked((int)0Xffffffff),
     }
 
+    [Flags]
     public enum ClearBufferMask
     {
         DepthBufferBit = ((int)0X00000100),
@@ -77,6 +81,7 @@ namespace OpenTK.Graphics
         ColorBufferBit = ((int)0X00004000),
     }
 
+    [Flags]
     public enum ClientAttribMask
     {
         ClientPixelStoreBit = ((int)0X00000001),
@@ -441,6 +446,7 @@ namespace OpenTK.Graphics
         LineResetToken = ((int)0X0707),
     }
 
+    [Flags]
     public enum FfdMaskSgix
     {
         TextureDeformationBitSgix = ((int)0X00000001),
@@ -2804,6 +2810,7 @@ namespace OpenTK.Graphics
         Ycrcb444Sgix = ((int)0X81bc),
     }
 
+    [Flags]
     public enum SgisTextureColorMask
     {
         TextureColorWritemaskSgis = ((int)0X81ef),
@@ -9867,6 +9874,7 @@ namespace OpenTK.Graphics
         UnsignedNormalized = ((int)0X8c17),
     }
 
+    [Flags]
     public enum BufferAccessMask
     {
         MapReadBit = ((int)0X0001),