Merge pull request #7871 from Mailaender/ambient-sound

Added a looping sound trait

OpenRA.Mods.Common/OpenRA.Mods.Common.csproj

@@ -416,6 +416,7 @@
     <Compile Include="Traits\ShakeOnDeath.cs" />
     <Compile Include="Traits\SmokeTrailWhenDamaged.cs" />
     <Compile Include="Traits\Sound\ActorLostNotification.cs" />
+    <Compile Include="Traits\Sound\AmbientSound.cs" />
     <Compile Include="Traits\Sound\AnnounceOnBuild.cs" />
     <Compile Include="Traits\Sound\AnnounceOnKill.cs" />
     <Compile Include="Traits\Sound\AnnounceOnSeen.cs" />

OpenRA.Mods.Common/Traits/Sound/AmbientSound.cs

@@ -0,0 +1,33 @@
+#region Copyright & License Information
+/*
+ * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
+ * This file is part of OpenRA, which is free software. It is made
+ * available to you under the terms of the GNU General Public License
+ * as published by the Free Software Foundation. For more information,
+ * see COPYING.
+ */
+#endregion
+
+using OpenRA.Traits;
+
+namespace OpenRA.Mods.Common.Traits
+{
+	[Desc("Plays a looping audio file at the actor position. Attach this to the `World` actor to cover the whole map.")]
+	class AmbientSoundInfo : ITraitInfo
+	{
+		public readonly string SoundFile = null;
+
+		public object Create(ActorInitializer init) { return new AmbientSound(init.Self, this); }
+	}
+
+	class AmbientSound
+	{
+		public AmbientSound(Actor self, AmbientSoundInfo info)
+		{
+			if (self == self.World.WorldActor)
+				Sound.PlayLooped(info.SoundFile);
+			else
+				Sound.PlayLooped(info.SoundFile, self.CenterPosition);
+		}
+	}
+}