Add basic VolumeControl and saving of volume to config.

osu.Game/Configuration/OsuConfigManager.cs

@@ -20,6 +20,10 @@ namespace osu.Game.Configuration
             Set(OsuConfig.Token, string.Empty);
 
             Set(OsuConfig.PlayMode, PlayMode.Osu);
+
+            Set(OsuConfig.VolumeGlobal, 0.8, 0, 1);
+            Set(OsuConfig.VolumeMusic, 1.0, 0, 1);
+            Set(OsuConfig.VolumeEffect, 1.0, 0, 1);
         }
     }
 
@@ -31,6 +35,9 @@ namespace osu.Game.Configuration
         Username,
         Password,
         Token,
-        PlayMode
+        PlayMode,
+        VolumeGlobal,
+        VolumeEffect,
+        VolumeMusic
     }
 }

osu.Game/OsuGame.cs

@@ -37,6 +37,11 @@ namespace osu.Game
         {
             base.Load();
 
+            //attach out bindables to the audio subsystem.
+            Audio.Volume.Weld(Config.GetBindable<double>(OsuConfig.VolumeGlobal));
+            Audio.VolumeSample.Weld(Config.GetBindable<double>(OsuConfig.VolumeEffect));
+            Audio.VolumeTrack.Weld(Config.GetBindable<double>(OsuConfig.VolumeMusic));
+
             Add(new Drawable[] {
                 intro = new Intro(),
                 Toolbar = new Toolbar
@@ -46,6 +51,12 @@ namespace osu.Game
                     OnPlayModeChange = delegate (PlayMode m) { PlayMode.Value = m; },
                     Alpha = 0.001f //fixes invalidation fuckup
                 },
+                new VolumeControl
+                {
+                    VolumeGlobal = Audio.Volume,
+                    VolumeSample = Audio.VolumeSample,
+                    VolumeTrack = Audio.VolumeTrack
+                }
             });
 
             intro.ModePushed += modeAdded;

osu.Game/VolumeControl.cs

@@ -0,0 +1,99 @@
+using System;
+using OpenTK;
+using OpenTK.Graphics;
+using osu.Framework.Configuration;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Drawables;
+using osu.Framework.Input;
+using osu.Framework.Graphics.Transformations;
+
+namespace osu.Game
+{
+    internal class VolumeControl : Container
+    {
+        private Box meterFill;
+        private Container meterContainer;
+
+        public BindableDouble VolumeGlobal { get; set; }
+        public BindableDouble VolumeSample { get; set; }
+        public BindableDouble VolumeTrack { get; set; }
+
+        public VolumeControl()
+        {
+            RelativeSizeAxes = Axes.Both;
+        }
+
+        public override void Load()
+        {
+            base.Load();
+            Children = new Drawable[]
+            {
+                meterContainer = new Container {
+                    Anchor = Anchor.BottomRight,
+                    Origin = Anchor.BottomRight,
+                    Position = new Vector2(10, 10),
+                    Size = new Vector2(40, 180),
+                    Children = new Drawable[]
+                    {
+                        new Box
+                        {
+                            Colour = Color4.Black,
+                            RelativeSizeAxes = Axes.Both,
+                        },
+                        new Container
+                        {
+                            RelativeSizeAxes = Axes.Both,
+                            Size = new Vector2(0.5f, 0.9f),
+                            Anchor = Anchor.Centre,
+                            Origin = Anchor.Centre,
+                            Children = new Drawable[]
+                            {
+                                new Box
+                                {
+                                    Colour = Color4.DarkGray,
+                                    RelativeSizeAxes = Axes.Both,
+                                },
+                                meterFill = new Box
+                                {
+                                    Colour = Color4.White,
+                                    RelativeSizeAxes = Axes.Both,
+                                    Origin = Anchor.BottomCentre,
+                                    Anchor = Anchor.BottomCentre
+                                },
+                            }
+                        }
+                    }
+                }
+            };
+        }
+
+        protected override bool OnWheelDown(InputState state)
+        {
+            appear();
+
+            VolumeGlobal.Value -= 0.05f;
+            meterFill.ScaleTo(new Vector2(1, (float)VolumeGlobal.Value), 300, EasingTypes.OutQuint);
+
+            return base.OnWheelDown(state);
+        }
+
+        protected override bool OnWheelUp(InputState state)
+        {
+            appear();
+
+            VolumeGlobal.Value += 0.05f;
+            meterFill.ScaleTo(new Vector2(1, (float)VolumeGlobal.Value), 300, EasingTypes.OutQuint);
+
+            return base.OnWheelUp(state);
+        }
+
+        private void appear()
+        {
+            meterContainer.ClearTransformations();
+            meterContainer.FadeIn(100);
+            meterContainer.Delay(1000);
+            meterContainer.FadeOut(100);
+        }
+    }
+}

osu.Game/osu.Game.csproj

@@ -131,6 +131,7 @@
     <Compile Include="Overlays\ToolbarModeSelector.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="Users\User.cs" />
+    <Compile Include="VolumeControl.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\osu-framework\osu.Framework\osu.Framework.csproj">