Input API rework

src/Input/Axis.cs

@@ -0,0 +1,12 @@
+namespace MoonWorks.Input
+{
+	public class Axis
+	{
+		public float Value { get; private set; }
+
+		internal void Update(float value)
+		{
+			Value = value;
+		}
+	}
+}

src/Input/AxisCode.cs

@@ -0,0 +1,11 @@
+namespace MoonWorks.Input
+{
+	// Enum values are equivalent to SDL GameControllerAxis
+	public enum AxisCode
+	{
+		LeftX,
+		LeftY,
+		RightX,
+		RightY
+	}
+}

src/Input/Button.cs

@@ -0,0 +1,17 @@
+namespace MoonWorks.Input
+{
+	public class Button
+	{
+		public ButtonState State { get; private set; }
+
+		public bool IsDown => State.IsDown;
+		public bool IsHeld => State.IsHeld;
+		public bool IsPressed => State.IsPressed;
+		public bool IsReleased => State.IsReleased;
+
+		internal void Update(bool isPressed)
+		{
+			State = State.Update(isPressed);
+		}
+	}
+}

src/Input/ButtonCode.cs

@@ -0,0 +1,22 @@
+namespace MoonWorks.Input
+{
+	// Enum values are equivalent to the SDL GameControllerButton value.
+	public enum ButtonCode
+	{
+		A,
+		B,
+		X,
+		Y,
+		Back,
+		Guide,
+		Start,
+		LeftStick,
+		RightStick,
+		LeftShoulder,
+		RightShoulder,
+		DpadUp,
+		DpadDown,
+		DpadLeft,
+		DpadRight
+	}
+}

src/Input/ButtonState.cs

@@ -2,7 +2,7 @@
 {
 	public struct ButtonState
 	{
-		private ButtonStatus ButtonStatus { get; set; }
+		public ButtonStatus ButtonStatus { get; }
 
 		public bool IsPressed => ButtonStatus == ButtonStatus.Pressed;
 		public bool IsHeld => ButtonStatus == ButtonStatus.Held;

src/Input/Gamepad.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using MoonWorks.Math;
 using SDL2;
 
@@ -8,32 +9,92 @@ namespace MoonWorks.Input
 	{
 		internal IntPtr Handle;
 
-		public ButtonState A { get; private set; } = new ButtonState();
-		public ButtonState B { get; private set; } = new ButtonState();
-		public ButtonState X { get; private set; } = new ButtonState();
-		public ButtonState Y { get; private set; } = new ButtonState();
-		public ButtonState Back { get; private set; } = new ButtonState();
-		public ButtonState Guide { get; private set; } = new ButtonState();
-		public ButtonState Start { get; private set; } = new ButtonState();
-		public ButtonState LeftStick { get; private set; } = new ButtonState();
-		public ButtonState RightStick { get; private set; } = new ButtonState();
-		public ButtonState LeftShoulder { get; private set; } = new ButtonState();
-		public ButtonState RightShoulder { get; private set; } = new ButtonState();
-		public ButtonState DpadUp { get; private set; } = new ButtonState();
-		public ButtonState DpadDown { get; private set; } = new ButtonState();
-		public ButtonState DpadLeft { get; private set; } = new ButtonState();
-		public ButtonState DpadRight { get; private set; } = new ButtonState();
+		public Button A { get; private set; } = new Button();
+		public Button B { get; private set; } = new Button();
+		public Button X { get; private set; } = new Button();
+		public Button Y { get; private set; } = new Button();
+		public Button Back { get; private set; } = new Button();
+		public Button Guide { get; private set; } = new Button();
+		public Button Start { get; private set; } = new Button();
+		public Button LeftStick { get; private set; } = new Button();
+		public Button RightStick { get; private set; } = new Button();
+		public Button LeftShoulder { get; private set; } = new Button();
+		public Button RightShoulder { get; private set; } = new Button();
+		public Button DpadUp { get; private set; } = new Button();
+		public Button DpadDown { get; private set; } = new Button();
+		public Button DpadLeft { get; private set; } = new Button();
+		public Button DpadRight { get; private set; } = new Button();
 
-		public float LeftX { get; private set; }
-		public float LeftY { get; private set; }
-		public float RightX { get; private set; }
-		public float RightY { get; private set; }
-		public float TriggerLeft { get; private set; }
-		public float TriggerRight { get; private set; }
+		public Axis LeftX { get; private set; }
+		public Axis LeftY { get; private set; }
+		public Axis RightX { get; private set; }
+		public Axis RightY { get; private set; }
+
+		public Trigger TriggerLeft { get; private set; }
+		public Trigger TriggerRight { get; private set; }
+
+		private Dictionary<SDL.SDL_GameControllerButton, Button> EnumToButton;
+		private Dictionary<SDL.SDL_GameControllerAxis, Axis> EnumToAxis;
+		private Dictionary<SDL.SDL_GameControllerAxis, Trigger> EnumToTrigger;
 
 		internal Gamepad(IntPtr handle)
 		{
 			Handle = handle;
+
+			EnumToButton = new Dictionary<SDL.SDL_GameControllerButton, Button>
+			{
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_A, A },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_B, B },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_X, X },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_Y, Y },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_BACK, Back },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_GUIDE, Guide },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_START, Start },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_LEFTSTICK, LeftStick },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_RIGHTSTICK, RightStick },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_LEFTSHOULDER, LeftShoulder },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_RIGHTSHOULDER, RightShoulder },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_UP, DpadUp },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_DOWN, DpadDown },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_LEFT, DpadLeft },
+				{ SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_RIGHT, DpadRight }
+			};
+
+			EnumToAxis = new Dictionary<SDL.SDL_GameControllerAxis, Axis>
+			{
+				{ SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_LEFTX, LeftX },
+				{ SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_LEFTY, LeftY },
+				{ SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_RIGHTX, RightX },
+				{ SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_RIGHTY, RightY }
+			};
+
+			EnumToTrigger = new Dictionary<SDL.SDL_GameControllerAxis, Trigger>
+			{
+				{ SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_TRIGGERLEFT, TriggerLeft },
+				{ SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_TRIGGERRIGHT, TriggerRight }
+			};
+		}
+
+		internal void Update()
+		{
+			foreach (var (sdlEnum, button) in EnumToButton)
+			{
+				button.Update(CheckPressed(sdlEnum));
+			}
+
+			foreach (var (sdlEnum, axis) in EnumToAxis)
+			{
+				var sdlAxisValue = SDL.SDL_GameControllerGetAxis(Handle, sdlEnum);
+				var axisValue = 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 = Normalize(sdlAxisValue, 0, short.MaxValue, 0, 1);
+				trigger.Update(axisValue);
+			}
 		}
 
 		public bool SetVibration(float leftMotor, float rightMotor, uint durationInMilliseconds)
@@ -46,50 +107,46 @@ namespace MoonWorks.Input
 			) == 0;
 		}
 
-		internal void Update()
+		public bool IsDown(ButtonCode buttonCode)
 		{
-			A = A.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_A));
-			B = B.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_B));
-			X = X.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_X));
-			Y = Y.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_Y));
-			Back = Back.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_BACK));
-			Guide = Guide.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_GUIDE));
-			Start = Start.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_START));
-			LeftStick = LeftStick.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_LEFTSTICK));
-			RightStick = RightStick.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_RIGHTSTICK));
-			LeftShoulder = LeftShoulder.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_LEFTSHOULDER));
-			RightShoulder = RightShoulder.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_RIGHTSHOULDER));
-			DpadUp = DpadUp.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_UP));
-			DpadDown = DpadDown.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_DOWN));
-			DpadLeft = DpadLeft.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_LEFT));
-			DpadRight = DpadRight.Update(IsPressed(SDL.SDL_GameControllerButton.SDL_CONTROLLER_BUTTON_DPAD_RIGHT));
-
-			LeftX = UpdateAxis(SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_LEFTX);
-			LeftY = UpdateAxis(SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_LEFTY);
-			RightX = UpdateAxis(SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_RIGHTX);
-			RightY = UpdateAxis(SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_RIGHTY);
-			TriggerLeft = UpdateTrigger(SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_TRIGGERLEFT);
-			TriggerRight = UpdateTrigger(SDL.SDL_GameControllerAxis.SDL_CONTROLLER_AXIS_TRIGGERRIGHT);
+			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].IsDown;
 		}
 
-		private bool IsPressed(SDL.SDL_GameControllerButton button)
+		public bool IsPressed(ButtonCode buttonCode)
+		{
+			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].IsPressed;
+		}
+
+		public bool IsHeld(ButtonCode buttonCode)
+		{
+			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].IsHeld;
+		}
+
+		public bool IsReleased(ButtonCode buttonCode)
+		{
+			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].IsReleased;
+		}
+
+		public ButtonState ButtonState(ButtonCode buttonCode)
+		{
+			return EnumToButton[(SDL.SDL_GameControllerButton) buttonCode].State;
+		}
+
+		public float AxisValue(AxisCode axisCode)
+		{
+			return EnumToAxis[(SDL.SDL_GameControllerAxis) axisCode].Value;
+		}
+
+		public float TriggerValue(TriggerCode triggerCode)
+		{
+			return EnumToTrigger[(SDL.SDL_GameControllerAxis) triggerCode].Value;
+		}
+
+		private bool CheckPressed(SDL.SDL_GameControllerButton button)
 		{
 			return MoonWorks.Conversions.ByteToBool(SDL.SDL_GameControllerGetButton(Handle, button));
 		}
 
-		private float UpdateAxis(SDL.SDL_GameControllerAxis axis)
-		{
-			var axisValue = SDL.SDL_GameControllerGetAxis(Handle, axis);
-			return Normalize(axisValue, short.MinValue, short.MaxValue, -1, 1);
-		}
-
-		// Triggers only go from 0 to short.MaxValue
-		private float UpdateTrigger(SDL.SDL_GameControllerAxis trigger)
-		{
-			var triggerValue = SDL.SDL_GameControllerGetAxis(Handle, trigger);
-			return Normalize(triggerValue, 0, short.MaxValue, 0, 1);
-		}
-
 		private float Normalize(float value, short min, short max, short newMin, short newMax)
 		{
 			return ((value - min) * (newMax - newMin)) / (max - min) + newMin;

src/Input/KeyCode.cs

@@ -1,7 +1,7 @@
 namespace MoonWorks.Input
 {
 	// Enum values are equivalent to the SDL Scancode value.
-	public enum Keycode : int
+	public enum KeyCode : int
 	{
 		Unknown = 0,
 		A = 4,

src/Input/Keyboard.cs

@@ -21,14 +21,14 @@ namespace MoonWorks.Input
 			(char) 22	// Ctrl+V (Paste)
 		};
 
-		private static readonly Dictionary<Keycode, int> TextInputBindings = new Dictionary<Keycode, int>()
+		private static readonly Dictionary<KeyCode, int> TextInputBindings = new Dictionary<KeyCode, int>()
 		{
-			{ Keycode.Home,         0 },
-			{ Keycode.End,          1 },
-			{ Keycode.Backspace,    2 },
-			{ Keycode.Tab,          3 },
-			{ Keycode.Return,       4 },
-			{ Keycode.Delete,       5 }
+			{ KeyCode.Home,         0 },
+			{ KeyCode.End,          1 },
+			{ KeyCode.Backspace,    2 },
+			{ KeyCode.Tab,          3 },
+			{ KeyCode.Return,       4 },
+			{ KeyCode.Delete,       5 }
 			// Ctrl+V is special!
 		};
 
@@ -37,7 +37,7 @@ namespace MoonWorks.Input
 			SDL.SDL_GetKeyboardState(out numKeys);
 
 			Keys = new ButtonState[numKeys];
-			foreach (Keycode keycode in Enum.GetValues(typeof(Keycode)))
+			foreach (KeyCode keycode in Enum.GetValues(typeof(KeyCode)))
 			{
 				Keys[(int) keycode] = new ButtonState();
 			}
@@ -47,18 +47,18 @@ namespace MoonWorks.Input
 		{
 			IntPtr keyboardState = SDL.SDL_GetKeyboardState(out _);
 
-			foreach (int keycode in Enum.GetValues(typeof(Keycode)))
+			foreach (int keycode in Enum.GetValues(typeof(KeyCode)))
 			{
 				var keyDown = Marshal.ReadByte(keyboardState, keycode);
 				Keys[keycode] = Keys[keycode].Update(Conversions.ByteToBool(keyDown));
 
 				if (Conversions.ByteToBool(keyDown))
 				{
-					if (TextInputBindings.TryGetValue((Keycode) keycode, out var textIndex))
+					if (TextInputBindings.TryGetValue((KeyCode) keycode, out var textIndex))
 					{
 						Inputs.OnTextInput(TextInputCharacters[(textIndex)]);
 					}
-					else if (IsDown(Keycode.LeftControl) && (Keycode) keycode == Keycode.V)
+					else if (IsDown(KeyCode.LeftControl) && (KeyCode) keycode == KeyCode.V)
 					{
 						Inputs.OnTextInput(TextInputCharacters[6]);
 					}
@@ -66,27 +66,27 @@ namespace MoonWorks.Input
 			}
 		}
 
-		public bool IsDown(Keycode keycode)
+		public bool IsDown(KeyCode keycode)
 		{
 			return Keys[(int) keycode].IsDown;
 		}
 
-		public bool IsPressed(Keycode keycode)
+		public bool IsPressed(KeyCode keycode)
 		{
 			return Keys[(int) keycode].IsPressed;
 		}
 
-		public bool IsHeld(Keycode keycode)
+		public bool IsHeld(KeyCode keycode)
 		{
 			return Keys[(int) keycode].IsHeld;
 		}
 
-		public bool IsReleased(Keycode keycode)
+		public bool IsReleased(KeyCode keycode)
 		{
 			return Keys[(int) keycode].IsReleased;
 		}
 
-		public ButtonState ButtonState(Keycode keycode)
+		public ButtonState ButtonState(KeyCode keycode)
 		{
 			return Keys[(int) keycode];
 		}

src/Input/Trigger.cs

@@ -0,0 +1,12 @@
+namespace MoonWorks.Input
+{
+	public class Trigger
+	{
+		public float Value { get; private set; }
+
+		internal void Update(float value)
+		{
+			Value = value;
+		}
+	}
+}

src/Input/TriggerCode.cs

@@ -0,0 +1,9 @@
+namespace MoonWorks.Input
+{
+	// Enum values correspond to SDL GameControllerAxis
+	public enum TriggerCode
+	{
+		Left = 4,
+		Right = 5
+	}
+}