VirtualButton system

src/Input/Axis.cs

@@ -1,15 +1,38 @@
+using System;
+using MoonWorks.Math;
+using SDL2;
+
 namespace MoonWorks.Input
 {
 	public class Axis
 	{
+		IntPtr GamepadHandle;
+		SDL.SDL_GameControllerAxis SDL_Axis;
+
+		public AxisCode Code { get; private set; }
+
 		/// <summary>
 		/// An axis value between -1 and 1.
 		/// </summary>
 		public float Value { get; private set; }
 
-		internal void Update(float value)
+		public Axis(
+			IntPtr gamepadHandle,
+			AxisCode code,
+			SDL.SDL_GameControllerAxis sdlAxis
+		) {
+			GamepadHandle = gamepadHandle;
+			SDL_Axis = sdlAxis;
+			Code = code;
+		}
+
+		internal void Update()
 		{
-			Value = value;
+			Value = MathHelper.Normalize(
+				SDL.SDL_GameControllerGetAxis(GamepadHandle, SDL_Axis),
+				short.MinValue, short.MaxValue,
+				-1, 1
+			);
 		}
 	}
 }

src/Input/AxisButtonCode.cs

@@ -0,0 +1,14 @@
+namespace MoonWorks.Input
+{
+	public enum AxisButtonCode
+	{
+		LeftX_Left,
+		LeftX_Right,
+		LeftY_Up,
+		LeftY_Down,
+		RightX_Left,
+		RightX_Right,
+		RightY_Up,
+		RightY_Down
+	}
+}

src/Input/ButtonCode.cs

@@ -1,7 +1,7 @@
 namespace MoonWorks.Input
 {
 	// Enum values are equivalent to the SDL GameControllerButton value.
-	public enum ButtonCode
+	public enum GamepadButtonCode
 	{
 		A,
 		B,

src/Input/ButtonIdentifier.cs

@@ -1,59 +0,0 @@
-namespace MoonWorks.Input
-{
-    // Blittable identifier that can be used for button state lookups.
-    public struct ButtonIdentifier : System.IEquatable<ButtonIdentifier>
-    {
-        public DeviceKind DeviceKind { get; }
-        public int Index { get; } // 1-4 for gamepads, 0 otherwise
-		public int Code { get; }
-
-        public ButtonIdentifier(Gamepad gamepad, ButtonCode buttonCode)
-        {
-			DeviceKind = DeviceKind.Gamepad;
-			Index = gamepad.Index;
-			Code = (int) buttonCode;
-		}
-
-        public ButtonIdentifier(KeyCode keyCode)
-        {
-			DeviceKind = DeviceKind.Keyboard;
-			Index = 0;
-			Code = (int) keyCode;
-		}
-
-        public ButtonIdentifier(MouseButtonCode mouseCode)
-        {
-			DeviceKind = DeviceKind.Mouse;
-			Index = 0;
-			Code = (int) mouseCode;
-		}
-
-		public override int GetHashCode()
-		{
-			return System.HashCode.Combine(DeviceKind, Index, Code);
-		}
-
-		public override bool Equals(object obj)
-		{
-			return obj is ButtonIdentifier identifier && Equals(identifier);
-		}
-
-		public bool Equals(ButtonIdentifier identifier)
-		{
-			return
-				DeviceKind == identifier.DeviceKind &&
-				Index == identifier.Index &&
-				Code == identifier.Code;
-		}
-
-		public static bool operator ==(ButtonIdentifier a, ButtonIdentifier b)
-		{
-			return a.Equals(b);
-		}
-
-		public static bool operator !=(ButtonIdentifier a, ButtonIdentifier b)
-		{
-			return !(a == b);
-		}
-	}
-}

src/Input/ButtonState.cs

@@ -9,7 +9,7 @@
 		public bool IsDown => ButtonStatus == ButtonStatus.Pressed || ButtonStatus == ButtonStatus.Held;
 		public bool IsReleased => ButtonStatus == ButtonStatus.Released;
 
-		public ButtonState(ButtonStatus buttonStatus)
+		internal ButtonState(ButtonStatus buttonStatus)
 		{
 			ButtonStatus = buttonStatus;
 		}

src/Input/Gamepad.cs

@@ -10,39 +10,57 @@ namespace MoonWorks.Input
 		internal IntPtr Handle;
 		internal int Index;
 
-		public Button A { get; } = new Button();
+		public GamepadButton A { get; }
-		public Button B { get; } = new Button();
+		public GamepadButton B { get; }
-		public Button X { get; } = new Button();
+		public GamepadButton X { get; }
-		public Button Y { get; } = new Button();
+		public GamepadButton Y { get; }
-		public Button Back { get; } = new Button();
+		public GamepadButton Back { get; }
-		public Button Guide { get; } = new Button();
+		public GamepadButton Guide { get; }
-		public Button Start { get; } = new Button();
+		public GamepadButton Start { get; }
-		public Button LeftStick { get; } = new Button();
+		public GamepadButton LeftStick { get; }
-		public Button RightStick { get; } = new Button();
+		public GamepadButton RightStick { get; }
-		public Button LeftShoulder { get; } = new Button();
+		public GamepadButton LeftShoulder { get; }
-		public Button RightShoulder { get; } = new Button();
+		public GamepadButton RightShoulder { get; }
-		public Button DpadUp { get; } = new Button();
+		public GamepadButton DpadUp { get; }
-		public Button DpadDown { get; } = new Button();
+		public GamepadButton DpadDown { get; }
-		public Button DpadLeft { get; } = new Button();
+		public GamepadButton DpadLeft { get; }
-		public Button DpadRight { get; } = new Button();
+		public GamepadButton DpadRight { get; }
 
-		public Axis LeftX { get; } = new Axis();
+		public Axis LeftX { get; }
-		public Axis LeftY { get; } = new Axis();
+		public Axis LeftY { get; }
-		public Axis RightX { get; } = new Axis();
+		public Axis RightX { get; }
-		public Axis RightY { get; } = new Axis();
+		public Axis RightY { get; }
 
-		public Trigger TriggerLeft { get; } = new Trigger();
+		public AxisButton LeftXLeft { get; }
-		public Trigger TriggerRight { get; } = new Trigger();
+		public AxisButton LeftXRight { get; }
+		public AxisButton LeftYUp { get; }
+		public AxisButton LeftYDown { get; }
+
+		public AxisButton RightXLeft { get; }
+		public AxisButton RightXRight { get; }
+		public AxisButton RightYUp { get; }
+		public AxisButton RightYDown { get; }
+
+		public Trigger TriggerLeft { get; }
+		public Trigger TriggerRight { get; }
+
+		public TriggerButton TriggerLeftButton { get; }
+		public TriggerButton TriggerRightButton { get; }
 
 		public bool IsDummy => Handle == IntPtr.Zero;
 
 		public bool AnyPressed { get; private set; }
-		public ButtonCode AnyPressedButtonCode { get; private set; }
+		public VirtualButton AnyPressedButton { get; private set; }
 
-		private Dictionary<SDL.SDL_GameControllerButton, Button> EnumToButton;
+		private Dictionary<SDL.SDL_GameControllerButton, GamepadButton> EnumToButton;
 		private Dictionary<SDL.SDL_GameControllerAxis, Axis> EnumToAxis;
 		private Dictionary<SDL.SDL_GameControllerAxis, Trigger> EnumToTrigger;
 
+		private Dictionary<AxisButtonCode, AxisButton> AxisButtonCodeToAxisButton;
+		private Dictionary<TriggerCode, TriggerButton> TriggerCodeToTriggerButton;
+
+		private VirtualButton[] VirtualButtons;
+
 		internal Gamepad(IntPtr handle, int index)
 		{
 			Handle = handle;
@@ -50,7 +68,48 @@ namespace MoonWorks.Input
 
 			AnyPressed = false;
 
-			EnumToButton = new Dictionary<SDL.SDL_GameControllerButton, Button>
+			A = new GamepadButton(handle, GamepadButtonCode.A, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_A);
+			B = new GamepadButton(handle, GamepadButtonCode.B, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_B);
+			X = new GamepadButton(handle, GamepadButtonCode.X, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_X);
+			Y = new GamepadButton(handle, GamepadButtonCode.Y, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_Y);
+
+			Back = new GamepadButton(handle, GamepadButtonCode.Back, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_BACK);
+			Guide = new GamepadButton(handle, GamepadButtonCode.Guide, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_GUIDE);
+			Start = new GamepadButton(handle, GamepadButtonCode.Start, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_START);
+
+			LeftStick = new GamepadButton(handle, GamepadButtonCode.LeftStick, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_LEFTSTICK);
+			RightStick = new GamepadButton(handle, GamepadButtonCode.RightStick, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_RIGHTSTICK);
+
+			LeftShoulder = new GamepadButton(handle, GamepadButtonCode.LeftShoulder, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_LEFTSHOULDER);
+			RightShoulder = new GamepadButton(handle, GamepadButtonCode.RightShoulder, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_RIGHTSHOULDER);
+
+			DpadUp = new GamepadButton(handle, GamepadButtonCode.DpadUp, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_UP);
+			DpadDown = new GamepadButton(handle, GamepadButtonCode.DpadDown, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_DOWN);
+			DpadLeft = new GamepadButton(handle, GamepadButtonCode.DpadLeft, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_LEFT);
+			DpadRight = new GamepadButton(handle, GamepadButtonCode.DpadRight, SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_RIGHT);
+
+			LeftX = new Axis(handle, AxisCode.LeftX, SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_LEFTX);
+			LeftY = new Axis(handle, AxisCode.LeftY, SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_LEFTY);
+			RightX = new Axis(handle, AxisCode.RightX, SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_RIGHTX);
+			RightY = new Axis(handle, AxisCode.RightY, SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_RIGHTY);
+
+			LeftXLeft = new AxisButton(LeftX, false);
+			LeftXRight = new AxisButton(LeftX, true);
+			LeftYUp = new AxisButton(LeftY, false);
+			LeftYDown = new AxisButton(LeftY, true);
+
+			RightXLeft = new AxisButton(RightX, false);
+			RightXRight = new AxisButton(RightX, true);
+			RightYUp = new AxisButton(RightY, false);
+			RightYDown = new AxisButton(RightY, true);
+
+			TriggerLeft = new Trigger(handle, TriggerCode.Left, SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_TRIGGERLEFT);
+			TriggerRight = new Trigger(handle, TriggerCode.Right, SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_TRIGGERRIGHT);
+
+			TriggerLeftButton = new TriggerButton(TriggerLeft);
+			TriggerRightButton = new TriggerButton(TriggerRight);
+
+			EnumToButton = new Dictionary<SDL.SDL_GameControllerButton, GamepadButton>
 			{
 				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_A, A },
 				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_B, B },
@@ -82,6 +141,47 @@ namespace MoonWorks.Input
 				{ SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_TRIGGERLEFT, TriggerLeft },
 				{ SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_TRIGGERRIGHT, TriggerRight }
 			};
+
+			AxisButtonCodeToAxisButton = new Dictionary<AxisButtonCode, AxisButton>
+			{
+				{ AxisButtonCode.LeftX_Left, LeftXLeft },
+				{ AxisButtonCode.LeftX_Right, LeftXRight },
+				{ AxisButtonCode.LeftY_Down, LeftYDown },
+				{ AxisButtonCode.LeftY_Up, LeftYUp },
+				{ AxisButtonCode.RightX_Left, RightXLeft },
+				{ AxisButtonCode.RightX_Right, RightXRight },
+				{ AxisButtonCode.RightY_Up, RightYUp },
+				{ AxisButtonCode.RightY_Down, RightYDown }
+			};
+
+			VirtualButtons = new VirtualButton[]
+			{
+				A,
+				B,
+				X,
+				Y,
+				Back,
+				Guide,
+				Start,
+				LeftStick,
+				RightStick,
+				LeftShoulder,
+				RightShoulder,
+				DpadUp,
+				DpadDown,
+				DpadLeft,
+				DpadRight,
+				LeftXLeft,
+				LeftXRight,
+				LeftYUp,
+				LeftYDown,
+				RightXLeft,
+				RightXRight,
+				RightYUp,
+				RightYDown,
+				TriggerLeftButton,
+				TriggerRightButton
+			};
 		}
 
 		internal void Update()
@@ -90,31 +190,42 @@ namespace MoonWorks.Input
 
 			if (!IsDummy)
 			{
-				foreach (var (sdlEnum, button) in EnumToButton)
+				foreach (var button in EnumToButton.Values)
 				{
-					var pressed = CheckPressed(sdlEnum);
+					button.Update();
-					button.Update(pressed);
+				}
 
+				foreach (var axis in EnumToAxis.Values)
+				{
+					axis.Update();
+				}
+
+				foreach (var trigger in EnumToTrigger.Values)
+				{
+					trigger.Update();
+				}
+
+				LeftXLeft.Update();
+				LeftXRight.Update();
+				LeftYUp.Update();
+				LeftYDown.Update();
+				RightXLeft.Update();
+				RightXRight.Update();
+				RightYUp.Update();
+				RightYDown.Update();
+
+				TriggerLeftButton.Update();
+				TriggerRightButton.Update();
+
+				foreach (var button in VirtualButtons)
+				{
 					if (button.IsPressed)
 					{
 						AnyPressed = true;
-						AnyPressedButtonCode = (ButtonCode) sdlEnum;
+						AnyPressedButton = button;
+						break;
 					}
 				}
-
-				foreach (var (sdlEnum, axis) in EnumToAxis)
-				{
-					var sdlAxisValue = SDL.SDL_GameControllerGetAxis(Handle, sdlEnum);
-					var axisValue = MathHelper.Normalize(sdlAxisValue, short.MinValue, short.MaxValue, -1, 1);
-					axis.Update(axisValue);
-				}
-
-				foreach (var (sdlEnum, trigger) in EnumToTrigger)
-				{
-					var sdlAxisValue = SDL.SDL_GameControllerGetAxis(Handle, sdlEnum);
-					var axisValue = MathHelper.Normalize(sdlAxisValue, 0, short.MaxValue, 0, 1);
-					trigger.Update(axisValue);
-				}
 			}
 		}
 
@@ -131,44 +242,19 @@ namespace MoonWorks.Input
 			) == 0;
 		}
 
-		/// <summary>
+		public GamepadButton Button(GamepadButtonCode buttonCode)
-		/// True if the button is pressed or held.
-		/// </summary>
-		public bool IsDown(ButtonCode buttonCode)
 		{
-			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].IsDown;
+			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode];
 		}
 
-		/// <summary>
+		public AxisButton Button(AxisButtonCode axisButtonCode)
-		/// True if the button was pressed this exact frame.
-		/// </summary>
-		public bool IsPressed(ButtonCode buttonCode)
 		{
-			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].IsPressed;
+			return AxisButtonCodeToAxisButton[axisButtonCode];
 		}
 
-		/// <summary>
+		public TriggerButton Button(TriggerCode triggerCode)
-		/// True if the button has been continuously held for more than one frame.
-		/// </summary>
-		public bool IsHeld(ButtonCode buttonCode)
 		{
-			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].IsHeld;
+			return TriggerCodeToTriggerButton[triggerCode];
-		}
-
-		/// <summary>
-		/// True if the button is not pressed.
-		/// </summary>
-		public bool IsReleased(ButtonCode buttonCode)
-		{
-			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].IsReleased;
-		}
-
-		/// <summary>
-		/// Obtains the button state given a ButtonCode.
-		/// </summary>
-		public ButtonState ButtonState(ButtonCode buttonCode)
-		{
-			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].State;
 		}
 
 		/// <summary>

src/Input/Input.cs

@@ -15,7 +15,7 @@ namespace MoonWorks.Input
 		public static event Action<char> TextInput;
 
 		public bool AnyPressed { get; private set; }
-		public ButtonIdentifier AnyPressedButton { get; private set; }
+		public VirtualButton AnyPressedButton { get; private set; }
 
 		internal Inputs()
 		{
@@ -49,7 +49,7 @@ namespace MoonWorks.Input
 			if (Keyboard.AnyPressed)
 			{
 				AnyPressed = true;
-				AnyPressedButton = new ButtonIdentifier(Keyboard.AnyPressedKeyCode);
+				AnyPressedButton = Keyboard.AnyPressedButton;
 			}
 
 			Mouse.Update();
@@ -57,7 +57,7 @@ namespace MoonWorks.Input
 			if (Mouse.AnyPressed)
 			{
 				AnyPressed = true;
-				AnyPressedButton = new ButtonIdentifier(Mouse.AnyPressedButtonCode);
+				AnyPressedButton = Mouse.AnyPressedButton;
 			}
 
 			foreach (var gamepad in gamepads)
@@ -67,7 +67,7 @@ namespace MoonWorks.Input
 				if (gamepad.AnyPressed)
 				{
 					AnyPressed = true;
-					AnyPressedButton = new ButtonIdentifier(gamepad, gamepad.AnyPressedButtonCode);
+					AnyPressedButton = gamepad.AnyPressedButton;
 				}
 			}
 		}
@@ -82,31 +82,6 @@ namespace MoonWorks.Input
 			return gamepads[slot];
 		}
 
-		public ButtonState ButtonState(ButtonIdentifier identifier)
-		{
-			if (identifier.DeviceKind == DeviceKind.Gamepad)
-			{
-				var gamepad = GetGamepad(identifier.Index);
-				return gamepad.ButtonState((ButtonCode) identifier.Code);
-			}
-			else if (identifier.DeviceKind == DeviceKind.Keyboard)
-			{
-				return Keyboard.ButtonState((KeyCode) identifier.Code);
-			}
-			else if (identifier.DeviceKind == DeviceKind.Mouse)
-			{
-				return Mouse.ButtonState((MouseButtonCode) identifier.Code);
-			}
-			else if (identifier.DeviceKind == DeviceKind.None)
-			{
-				return new ButtonState(ButtonStatus.Released);
-			}
-			else
-			{
-				throw new System.ArgumentException("Invalid button identifier!");
-			}
-		}
-
 		internal static void OnTextInput(char c)
 		{
 			if (TextInput != null)

src/Input/Keyboard.cs

@@ -8,9 +8,11 @@ namespace MoonWorks.Input
 	public class Keyboard
 	{
 		public bool AnyPressed { get; private set; }
-		public KeyCode AnyPressedKeyCode { get; private set; }
+		public KeyboardButton AnyPressedButton { get; private set; }
 
-		private Button[] Keys { get; }
+		public IntPtr State { get; private set; }
+
+		private KeyboardButton[] Keys { get; }
 		private int numKeys;
 
 		private static readonly char[] TextInputCharacters = new char[]
@@ -39,10 +41,10 @@ namespace MoonWorks.Input
 		{
 			SDL.SDL_GetKeyboardState(out numKeys);
 
-			Keys = new Button[numKeys];
+			Keys = new KeyboardButton[numKeys];
 			foreach (KeyCode keycode in Enum.GetValues(typeof(KeyCode)))
 			{
-				Keys[(int) keycode] = new Button();
+				Keys[(int) keycode] = new KeyboardButton(this, keycode);
 			}
 		}
 
@@ -50,14 +52,14 @@ namespace MoonWorks.Input
 		{
 			AnyPressed = false;
 
-			IntPtr keyboardState = SDL.SDL_GetKeyboardState(out _);
+			State = SDL.SDL_GetKeyboardState(out _);
 
 			foreach (int keycode in Enum.GetValues(typeof(KeyCode)))
 			{
-				var keyDown = Conversions.ByteToBool(Marshal.ReadByte(keyboardState, keycode));
+				var button = Keys[keycode];
-				Keys[keycode].Update(keyDown);
+				button.Update();
 
-				if (keyDown)
+				if (button.IsPressed)
 				{
 					if (TextInputBindings.TryGetValue((KeyCode) keycode, out var textIndex))
 					{
@@ -67,12 +69,9 @@ namespace MoonWorks.Input
 					{
 						Inputs.OnTextInput(TextInputCharacters[6]);
 					}
-				}
 
-				if (Keys[keycode].IsPressed)
-				{
 					AnyPressed = true;
-					AnyPressedKeyCode = (KeyCode) keycode;
+					AnyPressedButton = button;
 				}
 			}
 		}
@@ -97,7 +96,7 @@ namespace MoonWorks.Input
 			return Keys[(int) keycode].IsReleased;
 		}
 
-		public Button Button(KeyCode keycode)
+		public KeyboardButton Button(KeyCode keycode)
 		{
 			return Keys[(int) keycode];
 		}

src/Input/Mouse.cs

@@ -5,9 +5,9 @@ namespace MoonWorks.Input
 {
 	public class Mouse
 	{
-		public Button LeftButton { get; } = new Button();
+		public MouseButton LeftButton { get; }
-		public Button MiddleButton { get; } = new Button();
+		public MouseButton MiddleButton { get; }
-		public Button RightButton { get; } = new Button();
+		public MouseButton RightButton { get; }
 
 		public int X { get; private set; }
 		public int Y { get; private set; }
@@ -17,7 +17,9 @@ namespace MoonWorks.Input
 		public int Wheel { get; internal set; }
 
 		public bool AnyPressed { get; private set; }
-		public MouseButtonCode AnyPressedButtonCode { get; private set; }
+		public MouseButton AnyPressedButton { get; private set; }
+
+		public uint ButtonMask { get; private set; }
 
 		private bool relativeMode;
 		public bool RelativeMode
@@ -34,31 +36,37 @@ namespace MoonWorks.Input
 			}
 		}
 
-		private readonly Dictionary<MouseButtonCode, Button> CodeToButton;
+		private readonly Dictionary<MouseButtonCode, MouseButton> CodeToButton;
-		private readonly Dictionary<uint, MouseButtonCode> MaskToButtonCode;
+
+		private IEnumerable<MouseButton> Buttons
+		{
+			get
+			{
+				yield return LeftButton;
+				yield return MiddleButton;
+				yield return RightButton;
+			}
+		}
 
 		public Mouse()
 		{
-			CodeToButton = new Dictionary<MouseButtonCode, Button>
+			LeftButton = new MouseButton(this, MouseButtonCode.Left, SDL.SDL_BUTTON_LMASK);
+			MiddleButton = new MouseButton(this, MouseButtonCode.Middle, SDL.SDL_BUTTON_MMASK);
+			RightButton = new MouseButton(this, MouseButtonCode.Right, SDL.SDL_BUTTON_RMASK);
+
+			CodeToButton = new Dictionary<MouseButtonCode, MouseButton>
 			{
 				{ MouseButtonCode.Left, LeftButton },
 				{ MouseButtonCode.Right, RightButton },
 				{ MouseButtonCode.Middle, MiddleButton }
 			};
-
-			MaskToButtonCode = new Dictionary<uint, MouseButtonCode>
-			{
-				{ SDL.SDL_BUTTON_LMASK, MouseButtonCode.Left },
-				{ SDL.SDL_BUTTON_MMASK, MouseButtonCode.Middle },
-				{ SDL.SDL_BUTTON_RMASK, MouseButtonCode.Right }
-			};
 		}
 
 		internal void Update()
 		{
 			AnyPressed = false;
 
-			var buttonMask = SDL.SDL_GetMouseState(out var x, out var y);
+			ButtonMask = SDL.SDL_GetMouseState(out var x, out var y);
 			var _ = SDL.SDL_GetRelativeMouseState(out var deltaX, out var deltaY);
 
 			X = x;
@@ -66,16 +74,18 @@ namespace MoonWorks.Input
 			DeltaX = deltaX;
 			DeltaY = deltaY;
 
-			foreach (var (mask, buttonCode) in MaskToButtonCode)
+			LeftButton.Update();
+			MiddleButton.Update();
+			RightButton.Update();
+
+			foreach (var button in Buttons)
 			{
-				var pressed = IsPressed(buttonMask, mask);
+				button.Update();
-				var button = CodeToButton[buttonCode];
-				button.Update(pressed);
 
 				if (button.IsPressed)
 				{
 					AnyPressed = true;
-					AnyPressedButtonCode = buttonCode;
+					AnyPressedButton = button;
 				}
 			}
 		}
@@ -84,10 +94,5 @@ namespace MoonWorks.Input
 		{
 			return CodeToButton[buttonCode].State;
 		}
-
-		private bool IsPressed(uint buttonMask, uint buttonFlag)
-		{
-			return (buttonMask & buttonFlag) != 0;
-		}
 	}
 }

src/Input/Trigger.cs

@@ -1,15 +1,38 @@
+using System;
+using MoonWorks.Math;
+using SDL2;
+
 namespace MoonWorks.Input
 {
 	public class Trigger
 	{
+		public IntPtr GamepadHandle;
+		public SDL.SDL_GameControllerAxis SDL_Axis;
+
+		public TriggerCode Code { get; }
+
 		/// <summary>
 		/// A trigger value between 0 and 1.
 		/// </summary>
 		public float Value { get; private set; }
 
-		internal void Update(float value)
+		public Trigger(
+			IntPtr gamepadHandle,
+			TriggerCode code,
+			SDL.SDL_GameControllerAxis sdlAxis
+		) {
+			GamepadHandle = gamepadHandle;
+			Code = code;
+			SDL_Axis = sdlAxis;
+		}
+
+		internal void Update()
 		{
-			Value = value;
+			Value = MathHelper.Normalize(
+				SDL.SDL_GameControllerGetAxis(GamepadHandle, SDL_Axis),
+				0, short.MaxValue,
+				0, 1
+			);
 		}
 	}
 }

src/Input/VirtualButton.cs

@@ -1,8 +1,8 @@
 namespace MoonWorks.Input
 {
-	public class Button
+	public abstract class VirtualButton
 	{
-		public ButtonState State { get; private set; }
+		public ButtonState State { get; protected set; }
 
 		/// <summary>
 		/// True if the button is pressed or held.
@@ -24,9 +24,11 @@ namespace MoonWorks.Input
 		/// </summary>
 		public bool IsReleased => State.IsReleased;
 
-		internal void Update(bool isPressed)
+		internal virtual void Update()
 		{
-			State = State.Update(isPressed);
+			State = State.Update(CheckPressed());
-		}
+		}
+
+		internal abstract bool CheckPressed();
 	}
 }

src/Input/VirtualButtons/AxisButton.cs

@@ -0,0 +1,73 @@
+namespace MoonWorks.Input
+{
+	public class AxisButton : VirtualButton
+	{
+		public Axis Parent { get; }
+		public AxisButtonCode Code { get; }
+
+		private float threshold = 0.9f;
+		public float Threshold
+		{
+			get => threshold;
+			set => threshold = System.Math.Clamp(value, 0, 1);
+		}
+
+		private int Sign;
+
+		internal AxisButton(Axis parent, bool positive)
+		{
+			Parent = parent;
+			Sign = positive ? 1 : -1;
+
+			if (parent.Code == AxisCode.LeftX)
+			{
+				if (positive)
+				{
+					Code = AxisButtonCode.LeftX_Right;
+				}
+				else
+				{
+					Code = AxisButtonCode.LeftX_Left;
+				}
+			}
+			else if (parent.Code == AxisCode.LeftY)
+			{
+				if (positive)
+				{
+					Code = AxisButtonCode.LeftY_Up;
+				}
+				else
+				{
+					Code = AxisButtonCode.LeftY_Down;
+				}
+			}
+			else if (parent.Code == AxisCode.RightX)
+			{
+				if (positive)
+				{
+					Code = AxisButtonCode.RightX_Right;
+				}
+				else
+				{
+					Code = AxisButtonCode.RightX_Left;
+				}
+			}
+			else if (parent.Code == AxisCode.RightY)
+			{
+				if (positive)
+				{
+					Code = AxisButtonCode.RightY_Up;
+				}
+				else
+				{
+					Code = AxisButtonCode.RightY_Down;
+				}
+			}
+		}
+
+		internal override bool CheckPressed()
+		{
+			return Sign * Parent.Value >= threshold;
+		}
+	}
+}

src/Input/VirtualButtons/GamepadButton.cs

@@ -0,0 +1,25 @@
+using System;
+using SDL2;
+
+namespace MoonWorks.Input
+{
+	public class GamepadButton : VirtualButton
+	{
+		IntPtr GamepadHandle;
+		SDL.SDL_GameControllerButton SDL_Button;
+
+		public GamepadButtonCode Code { get; private set; }
+
+		internal GamepadButton(IntPtr gamepadHandle, GamepadButtonCode code, SDL.SDL_GameControllerButton sdlButton)
+		{
+			GamepadHandle = gamepadHandle;
+			Code = code;
+			SDL_Button = sdlButton;
+		}
+
+		internal override bool CheckPressed()
+		{
+			return MoonWorks.Conversions.ByteToBool(SDL.SDL_GameControllerGetButton(GamepadHandle, SDL_Button));
+		}
+	}
+}

src/Input/VirtualButtons/KeyboardButton.cs

@@ -0,0 +1,21 @@
+using System.Runtime.InteropServices;
+
+namespace MoonWorks.Input
+{
+	public class KeyboardButton : VirtualButton
+	{
+		Keyboard Parent;
+		KeyCode KeyCode;
+
+		internal KeyboardButton(Keyboard parent, KeyCode keyCode)
+		{
+			Parent = parent;
+			KeyCode = keyCode;
+		}
+
+		internal override bool CheckPressed()
+		{
+			return Conversions.ByteToBool(Marshal.ReadByte(Parent.State, (int) KeyCode));
+		}
+	}
+}

src/Input/VirtualButtons/MouseButton.cs

@@ -0,0 +1,22 @@
+namespace MoonWorks.Input
+{
+	public class MouseButton : VirtualButton
+	{
+		Mouse Parent;
+		uint ButtonMask;
+
+		public MouseButtonCode Code { get; private set; }
+
+		internal MouseButton(Mouse parent, MouseButtonCode code, uint buttonMask)
+		{
+			Parent = parent;
+			Code = code;
+			ButtonMask = buttonMask;
+		}
+
+		internal override bool CheckPressed()
+		{
+			return (Parent.ButtonMask & ButtonMask) != 0;
+		}
+	}
+}

src/Input/VirtualButtons/TriggerButton.cs

@@ -0,0 +1,25 @@
+namespace MoonWorks.Input
+{
+	public class TriggerButton : VirtualButton
+	{
+		public Trigger Parent { get; }
+		public TriggerCode Code => Parent.Code;
+
+		private float threshold = 0.7f;
+		public float Threshold
+		{
+			get => threshold;
+			set => threshold = System.Math.Clamp(value, 0, 1);
+		}
+
+		internal TriggerButton(Trigger parent)
+		{
+			Parent = parent;
+		}
+
+		internal override bool CheckPressed()
+		{
+			return Parent.Value >= Threshold;
+		}
+	}
+}