[Input] Added hat state to JoystickState

Source/OpenTK/Input/JoystickState.cs

@@ -42,12 +42,17 @@ public struct JoystickState : IEquatable<JoystickState>
         // then we'll need to increase these limits.
         internal const int MaxAxes = (int)JoystickAxis.Last + 1;
         internal const int MaxButtons = (int)JoystickButton.Last + 1;
+        internal const int MaxHats = (int)JoystickHat.Last + 1;
 
         const float ConversionFactor = 1.0f / (short.MaxValue + 0.5f);
 
-        unsafe fixed short axes[MaxAxes];
-        int buttons;
         int packet_number;
+        int buttons;
+        unsafe fixed short axes[MaxAxes];
+        JoystickHatState hat0;
+        JoystickHatState hat1;
+        JoystickHatState hat2;
+        JoystickHatState hat3;
         bool is_connected;
 
         #region Public Members
@@ -76,6 +81,28 @@ public ButtonState GetButton(JoystickButton button)
             return (buttons & (1 << (int)button)) != 0 ? ButtonState.Pressed : ButtonState.Released;
         }
 
+        /// <summary>
+        /// Gets the hat.
+        /// </summary>
+        /// <returns>The hat.</returns>
+        /// <param name="hat">Hat.</param>
+        public JoystickHatState GetHat(JoystickHat hat)
+        {
+            switch (hat)
+            {
+                case JoystickHat.Hat0:
+                    return hat0;
+                case JoystickHat.Hat1:
+                    return hat1;
+                case JoystickHat.Hat2:
+                    return hat2;
+                case JoystickHat.Hat3:
+                    return hat3;
+                default:
+                    return new JoystickHatState();
+            }
+        }
+
         /// <summary>
         /// Gets a value indicating whether the specified <see cref="JoystickButton"/> is currently pressed.
         /// </summary>
@@ -198,6 +225,9 @@ internal void SetAxis(JoystickAxis axis, short value)
         internal void SetButton(JoystickButton button, bool value)
         {
             int index = 1 << (int)button;
+            if (index < 0 || index >= MaxButtons)
+                throw new ArgumentOutOfRangeException("button");
+
             if (value)
             {
                 buttons |= index;
@@ -208,6 +238,23 @@ internal void SetButton(JoystickButton button, bool value)
             }
         }
 
+        internal void SetHat(JoystickHat hat, JoystickHatState value)
+        {
+            switch (hat)
+            {
+                case JoystickHat.Hat0:
+                    hat0 = value;
+                case JoystickHat.Hat1:
+                    hat1 = value;
+                case JoystickHat.Hat2:
+                    hat2 = value;
+                case JoystickHat.Hat3:
+                    hat3 = value;
+                default:
+                    throw new ArgumentOutOfRangeException("hat");
+            }
+        }
+
         internal void SetIsConnected(bool value)
         {
             is_connected = value;