Add combo numbers.

osu.Game.Modes.Osu/Objects/Drawables/DrawableHitCircle.cs

@@ -49,7 +49,10 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
                         return true;
                     },
                 },
-                number = new NumberPiece(),
+                number = new NumberPiece()
+                {
+                    Text = h is Spinner ? "S" : (HitObject.ComboIndex + 1).ToString(),
+                },
                 ring = new RingPiece(),
                 flash = new FlashPiece(),
                 explode = new ExplodePiece

osu.Game.Modes.Osu/Objects/Drawables/DrawableSlider.cs

@@ -49,8 +49,10 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
                 },
                 initialCircle = new DrawableHitCircle(new HitCircle
                 {
+                    //todo: avoid creating this temporary HitCircle.
                     StartTime = s.StartTime,
                     Position = s.StackedPosition,
+                    ComboIndex = s.ComboIndex,
                     Scale = s.Scale,
                     Colour = s.Colour,
                     Sample = s.Sample,

osu.Game.Modes.Osu/Objects/Drawables/Pieces/NumberPiece.cs

@@ -6,33 +6,54 @@ using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Sprites;
+using OpenTK;
+using OpenTK.Graphics;
 
 namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
 {
     public class NumberPiece : Container
     {
-        private Sprite number;
+        private SpriteText number;
+
+        public string Text
+        {
+            get { return number.Text; }
+            set { number.Text = value; }
+        }
 
         public NumberPiece()
         {
             Anchor = Anchor.Centre;
             Origin = Anchor.Centre;
 
-            Children = new[]
+            Children = new Drawable[]
             {
-                number = new Sprite
+                new CircularContainer
                 {
+                    EdgeEffect = new EdgeEffect
+                    {
+                        Type = EdgeEffectType.Glow,
+                        Radius = 60,
+                        Colour = Color4.White.Opacity(0.5f),
+                    },
+                    Children = new[]
+                    {
+                        new Box()
+                    }
+                },
+                number = new OsuSpriteText
+                {
+                    Text = @"1",
+                    Font = @"Venera",
+                    UseFullGlyphHeight = false,
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre,
+                    TextSize = 40,
                     Alpha = 1
                 }
             };
         }
-
-        [BackgroundDependencyLoader]
-        private void load(TextureStore textures)
-        {
-            number.Texture = textures.Get(@"Play/osu/number");
-        }
     }
 }

osu.Game.Modes.Osu/Objects/OsuHitObjectConverter.cs

@@ -15,8 +15,14 @@ namespace osu.Game.Modes.Osu.Objects
         {
             List<OsuHitObject> output = new List<OsuHitObject>();
 
+            int combo = 0;
             foreach (HitObject h in beatmap.HitObjects)
+            {
+                if (h.NewCombo) combo = 0;
+
+                h.ComboIndex = combo++;
                 output.Add(h as OsuHitObject);
+            }
 
             UpdateStacking(output, beatmap.BeatmapInfo?.StackLeniency ?? 0.7f);
 

osu.Game/Modes/Objects/HitObject.cs

@@ -24,6 +24,8 @@ namespace osu.Game.Modes.Objects
 
         public HitSampleInfo Sample;
 
+        public int ComboIndex;
+
         public virtual void SetDefaultsFromBeatmap(Beatmap beatmap) { }
     }
 }