Add Discord GameSDK.

Assets/Cryville/Crtr/Browsing/ResourceBrowserMaster.cs

@@ -73,6 +73,7 @@ namespace Cryville.Crtr.Browsing {
 			Application.LoadLevelAdditive("Play");
 #endif
 			GameObject.Find("/Master").GetComponent<Master>().HideMenu();
+			DiscordController.Instance.SetPlaying(string.Format("{0} - {1}", detail.Meta.song.name, detail.Meta.name), detail.Meta.length);
 		}
 
 		public void OpenConfig(int id, ChartDetail detail) {

Assets/Cryville/Crtr/ChartPlayer.cs

@@ -279,6 +279,7 @@ namespace Cryville.Crtr {
 #elif UNITY_5_3_OR_NEWER
 			SceneManager.UnloadScene("Play");
 #endif
+			DiscordController.Instance.SetIdle();
 		}
 #pragma warning restore IDE1006
 

Assets/Cryville/Crtr/DiscordController.cs

@@ -0,0 +1,54 @@
+using Discord;
+using System;
+using UnityEngine;
+
+namespace Cryville.Crtr {
+	internal class DiscordController : MonoBehaviour {
+		public static DiscordController Instance;
+
+		const long CLIENT_ID = 1059021675578007622L;
+
+		Discord.Discord dc;
+		ActivityManager am;
+		long launchTime;
+
+		void Start() {
+			Instance = this;
+			launchTime = (long)(DateTime.UtcNow - DateTime.UnixEpoch).TotalSeconds;
+			dc = new Discord.Discord(CLIENT_ID, (UInt64)CreateFlags.Default);
+			am = dc.GetActivityManager();
+			SetIdle();
+		}
+
+		void Update() {
+			dc.RunCallbacks();
+		}
+
+		void OnApplicationQuit() {
+			dc.Dispose();
+		}
+
+		void Callback(Result result) { }
+
+		public void SetIdle() {
+			am.UpdateActivity(new Activity {
+				State = "Idle",
+				Instance = false,
+				Timestamps = { Start = launchTime },
+			}, Callback);
+		}
+
+		public void SetPlaying(string detail, double? duration) {
+			long now = (long)(DateTime.UtcNow - DateTime.UnixEpoch).TotalSeconds;
+			am.UpdateActivity(new Activity {
+				State = "Playing a chart",
+				Details = detail,
+				Instance = true,
+				Timestamps = {
+					Start = now,
+					End = duration == null ? 0 : now + (long)duration,
+				},
+			}, Callback);
+		}
+	}
+}

Assets/Cryville/Crtr/DiscordController.cs.meta

@@ -0,0 +1,11 @@
+fileFormatVersion: 2
+guid: 7f7c5da9a520bef4e832e2f89f7b737f
+MonoImporter:
+  externalObjects: {}
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/Cryville/Cryville.Crtr.asmdef

@@ -2,7 +2,8 @@
     "name": "Cryville.Crtr",
     "rootNamespace": "",
     "references": [
-        "GUID:d8ea0e0da3ad53a45b65c912ffcacab0"
+        "GUID:d8ea0e0da3ad53a45b65c912ffcacab0",
+        "GUID:5686e5ee69d0e084c843d61c240d7fdb"
     ],
     "includePlatforms": [],
     "excludePlatforms": [],