add mouse input + move inputs to Input namespace

src/Game.cs

@@ -2,6 +2,7 @@
 using SDL2;
 using MoonWorks.Audio;
 using MoonWorks.Graphics;
+using MoonWorks.Input;
 
 namespace MoonWorks
 {
@@ -16,7 +17,7 @@ namespace MoonWorks
         public Window Window { get; }
         public GraphicsDevice GraphicsDevice { get; }
         public AudioDevice AudioDevice { get; }
-        public Input Input { get; }
+        public Inputs Inputs { get; }
 
         private Dictionary<PresentMode, RefreshCS.Refresh.PresentMode> moonWorksToRefreshPresentMode = new Dictionary<PresentMode, RefreshCS.Refresh.PresentMode>
         {
@@ -42,7 +43,7 @@ namespace MoonWorks
 
             Logger.Initialize();
 
-            Input = new Input();
+            Inputs = new Inputs();
 
             Window = new Window(windowCreateInfo);
 
@@ -81,7 +82,7 @@ namespace MoonWorks
                     {
                         HandleSDLEvents();
 
-                        Input.Update();
+                        Inputs.Update();
                         AudioDevice.Update();
 
                         Update(timestep);

src/Input/ButtonState.cs

@@ -1,4 +1,4 @@
-namespace MoonWorks
+namespace MoonWorks.Input
 {
     public enum ButtonState
     {

src/Input/Gamepad.cs

@@ -1,7 +1,7 @@
 using System;
 using SDL2;
 
-namespace MoonWorks
+namespace MoonWorks.Input
 {
     public class Gamepad
     {

src/Input/Input.cs

@@ -1,17 +1,19 @@
 using SDL2;
 using System.Collections.Generic;
 
-namespace MoonWorks
+namespace MoonWorks.Input
 {
-    public class Input
+    public class Inputs
     {
         public Keyboard Keyboard { get; }
+        public Mouse Mouse { get; }
 
         List<Gamepad> gamepads = new List<Gamepad>();
 
-        internal Input()
+        internal Inputs()
         {
             Keyboard = new Keyboard();
+            Mouse = new Mouse();
 
             for (int i = 0; i < SDL.SDL_NumJoysticks(); i++)
             {
@@ -26,6 +28,7 @@ namespace MoonWorks
         internal void Update()
         {
             Keyboard.Update();
+            Mouse.Update();
 
             foreach (var gamepad in gamepads)
             {

src/Input/Key.cs

@@ -1,4 +1,4 @@
-namespace MoonWorks
+namespace MoonWorks.Input
 {
     internal class Key
     {

src/Input/Keyboard.cs

@@ -2,7 +2,7 @@ using System;
 using System.Runtime.InteropServices;
 using SDL2;
 
-namespace MoonWorks
+namespace MoonWorks.Input
 {
     public class Keyboard
     {

src/Input/Keycode.cs

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

src/Input/Mouse.cs

@@ -0,0 +1,65 @@
+using SDL2;
+
+namespace MoonWorks.Input
+{
+    public class Mouse
+    {
+        public ButtonState LeftButton { get; private set; }
+        public ButtonState MiddleButton { get; private set; }
+        public ButtonState RightButton { get; private set; }
+
+        public int X { get; private set; }
+        public int Y { get; private set; }
+        public int DeltaX { get; private set; }
+        public int DeltaY { get; private set; }
+
+        private bool relativeMode;
+        public bool RelativeMode
+        {
+            get => relativeMode;
+            set
+            {
+                relativeMode = value;
+                SDL.SDL_SetRelativeMouseMode(
+                    relativeMode ? 
+                    SDL.SDL_bool.SDL_TRUE : 
+                    SDL.SDL_bool.SDL_FALSE
+                );
+            }
+        }
+
+        internal void Update()
+        {
+            var buttons = SDL.SDL_GetMouseState(out var x, out var y);
+            var _ = SDL.SDL_GetRelativeMouseState(out var deltaX, out var deltaY);
+
+            X = x;
+            Y = y;
+            DeltaX = deltaX;
+            DeltaY = deltaY;
+
+            LeftButton = UpdateState(LeftButton, buttons, SDL.SDL_BUTTON_LEFT);
+            MiddleButton = UpdateState(MiddleButton, buttons, SDL.SDL_BUTTON_MIDDLE);
+            RightButton = UpdateState(RightButton, buttons, SDL.SDL_BUTTON_RIGHT);
+        }
+
+        private ButtonState UpdateState(ButtonState state, uint buttonMask, uint buttonFlag)
+        {
+            var isPressed = buttonMask & buttonFlag;
+
+            if (isPressed != 0)
+            {
+                if (state == ButtonState.Pressed)
+                {
+                    return ButtonState.Held;
+                }
+                else if (state == ButtonState.Released)
+                {
+                    return ButtonState.Pressed;
+                }
+            }
+
+            return ButtonState.Released;
+        }
+    }
+}