Add mute option to the game

OpenRA.Game/Settings.cs

@@ -127,6 +127,7 @@ namespace OpenRA
 		public string Device = null;
 
 		public bool CashTicks = true;
+		public bool Mute = false;
 	}
 
 	public class PlayerSettings
@@ -204,6 +205,7 @@ namespace OpenRA
 		public Hotkey DevReloadChromeKey = new Hotkey(Keycode.C, Modifiers.Ctrl | Modifiers.Shift);
 		public Hotkey HideUserInterfaceKey = new Hotkey(Keycode.H, Modifiers.Ctrl | Modifiers.Shift);
 		public Hotkey TakeScreenshotKey = new Hotkey(Keycode.P, Modifiers.Ctrl);
+		public Hotkey ToggleMuteKey = new Hotkey(Keycode.M, Modifiers.None);
 
 		public Hotkey Production01Key = new Hotkey(Keycode.F1, Modifiers.None);
 		public Hotkey Production02Key = new Hotkey(Keycode.F2, Modifiers.None);

OpenRA.Game/Sound/Sound.cs

@@ -114,6 +114,16 @@ namespace OpenRA
 			soundEngine.StopAllSounds();
 		}
 
+		public void MuteAudio()
+		{
+			soundEngine.Volume = 0f;
+		}
+
+		public void UnmuteAudio()
+		{
+			soundEngine.Volume = 1f;
+		}
+
 		public ISound Play(string name) { return Play(null, name, true, WPos.Zero, 1f); }
 		public ISound Play(string name, WPos pos) { return Play(null, name, false, pos, 1f); }
 		public ISound Play(string name, float volumeModifier) { return Play(null, name, true, WPos.Zero, volumeModifier); }

OpenRA.Game/Widgets/WorldInteractionControllerWidget.cs

@@ -302,6 +302,8 @@ namespace OpenRA.Widgets
 					return CycleStatusBars();
 				else if (key == Game.Settings.Keys.TogglePixelDoubleKey)
 					return TogglePixelDouble();
+				else if (key == Game.Settings.Keys.ToggleMuteKey)
+					return ToggleMute();
 			}
 
 			return false;
@@ -360,5 +362,23 @@ namespace OpenRA.Widgets
 			worldRenderer.Viewport.Zoom = Game.Settings.Graphics.PixelDouble ? 2 : 1;
 			return true;
 		}
+
+		bool ToggleMute()
+		{
+			Game.Settings.Sound.Mute ^= true;
+
+			if (Game.Settings.Sound.Mute)
+			{
+				Game.Sound.MuteAudio();
+				Game.Debug("Audio muted");
+			}
+			else
+			{
+				Game.Sound.UnmuteAudio();
+				Game.Debug("Audio unmuted");
+			}
+
+			return true;
+		}
 	}
 }