Add libgamemode support

osu.Desktop/HighPerformanceSession/Gamemode.cs

@@ -0,0 +1,41 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System.Runtime.InteropServices;
+
+namespace Gamemode
+{
+    public static class GamemodeRequest
+    {
+
+        [DllImport("libgamemode.so.0")]
+        private static extern int real_gamemode_request_start();
+
+        [DllImport("libgamemode.so.0")]
+        private static extern int real_gamemode_request_end();
+
+        public static int RequestStart()
+        {
+            try
+            {
+                return real_gamemode_request_start();
+            }
+            catch
+            {
+                return -1;
+            }
+        }
+
+        public static int RequestEnd()
+        {
+            try
+            {
+                return real_gamemode_request_end();
+            }
+            catch
+            {
+                return -1;
+            }
+        }
+    }
+}

osu.Desktop/HighPerformanceSession/HighPerformanceSession.cs

@@ -0,0 +1,46 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Bindables;
+using osu.Framework.Graphics;
+using osu.Framework.Logging;
+using osu.Game;
+using osu.Game.Configuration;
+using Gamemode;
+
+namespace osu.Desktop
+{
+    public class HighPerformanceSession : Component
+    {
+
+        private Bindable<bool> localUserPlaying;
+
+        [BackgroundDependencyLoader]
+        private void load(OsuGame game, OsuConfigManager config)
+        {
+            localUserPlaying = game.LocalUserPlaying.GetBoundCopy();
+            localUserPlaying.BindValueChanged(e => onPlayerStateChange(e.NewValue));
+        }
+
+        private void onPlayerStateChange(bool state)
+        {
+            if (state)
+                enableHighPerformanceSession();
+            else
+                disableHighPerformanceSession();
+        }
+
+        private void enableHighPerformanceSession()
+        {
+            int gamemodeRequestResult = GamemodeRequest.RequestStart();
+            Logger.Log($"Gamemode \"Start\" request exited with code {gamemodeRequestResult}");
+        }
+
+        private void disableHighPerformanceSession()
+        {
+            int gamemodeRequestResult = GamemodeRequest.RequestEnd();
+            Logger.Log($"Gamemode \"End\" request exited with code {gamemodeRequestResult}");
+        }
+    }
+}

osu.Desktop/OsuGameDesktop.cs

@@ -109,6 +109,8 @@ protected override void LoadComplete()
 
             LoadComponentAsync(new DiscordRichPresence(), Add);
 
+            LoadComponentAsync(new HighPerformanceSession(), Add);
+
             if (RuntimeInfo.OS == RuntimeInfo.Platform.Windows)
                 LoadComponentAsync(new GameplayWinKeyBlocker(), Add);
         }