Merge https://github.com/ppy/osu into channel-selection

osu.Game/Graphics/Backgrounds/Triangles.cs

@@ -23,6 +23,13 @@ namespace osu.Game.Graphics.Backgrounds
     public class Triangles : Drawable
     {
         private const float triangle_size = 100;
+        private const float base_velocity = 50;
+
+        /// <summary>
+        /// How many screen-space pixels are smoothed over.
+        /// Same behavior as Sprite's EdgeSmoothness.
+        /// </summary>
+        private const float edge_smoothness = 1;
 
         public override bool HandleInput => false;
 
@@ -103,31 +110,34 @@ namespace osu.Game.Graphics.Backgrounds
 
             Invalidate(Invalidation.DrawNode, shallPropagate: false);
 
-            for (int i = 0; i < parts.Count; i++)
-            {
-                TriangleParticle newParticle = parts[i];
+            if (CreateNewTriangles)
+                addTriangles(false);
 
             float adjustedAlpha = HideAlphaDiscrepancies ?
                 // Cubically scale alpha to make it drop off more sharply.
                 (float)Math.Pow(DrawInfo.Colour.AverageColour.Linear.A, 3) :
                 1;
 
+            float elapsedSeconds = (float)Time.Elapsed / 1000;
+            // Since position is relative, the velocity needs to scale inversely with DrawHeight.
+            // Since we will later multiply by the scale of individual triangles we normalize by
+            // dividing by triangleScale.
+            float movedDistance = -elapsedSeconds * Velocity * base_velocity / (DrawHeight * triangleScale);
 
-                newParticle.Position += new Vector2(0, -(parts[i].Scale * (50 / DrawHeight)) / triangleScale * Velocity) * ((float)Time.Elapsed / 950);
+            for (int i = 0; i < parts.Count; i++)
+            {
+                TriangleParticle newParticle = parts[i];
+
+                // Scale moved distance by the size of the triangle. Smaller triangles should move more slowly.
+                newParticle.Position.Y += parts[i].Scale * movedDistance;
                 newParticle.Colour.A = adjustedAlpha;
 
                 parts[i] = newParticle;
 
-                if (!CreateNewTriangles)
-                    continue;
-
                 float bottomPos = parts[i].Position.Y + triangle_size * parts[i].Scale * 0.866f / DrawHeight;
-
                 if (bottomPos < 0)
                     parts.RemoveAt(i);
             }
-
-            addTriangles(false);
         }
 
         private void addTriangles(bool randomY)
@@ -211,20 +221,28 @@ namespace osu.Game.Graphics.Backgrounds
                 Shader.Bind();
                 Texture.TextureGL.Bind();
 
+                Vector2 localInflationAmount = edge_smoothness * DrawInfo.MatrixInverse.ExtractScale().Xy;
+
                 foreach (TriangleParticle particle in Parts)
                 {
-                    var offset = new Vector2(particle.Scale * 0.5f, particle.Scale * 0.866f);
+                    var offset = triangle_size * new Vector2(particle.Scale * 0.5f, particle.Scale * 0.866f);
+                    var size = new Vector2(2 * offset.X, offset.Y);
 
                     var triangle = new Triangle(
                         particle.Position * Size * DrawInfo.Matrix,
-                        (particle.Position * Size + offset * triangle_size) * DrawInfo.Matrix,
-                        (particle.Position * Size + new Vector2(-offset.X, offset.Y) * triangle_size) * DrawInfo.Matrix
+                        (particle.Position * Size + offset) * DrawInfo.Matrix,
+                        (particle.Position * Size + new Vector2(-offset.X, offset.Y)) * DrawInfo.Matrix
                     );
 
                     ColourInfo colourInfo = DrawInfo.Colour;
                     colourInfo.ApplyChild(particle.Colour);
 
-                    Texture.DrawTriangle(triangle, colourInfo, null, Shared.VertexBatch.Add);
+                    Texture.DrawTriangle(
+                        triangle,
+                        colourInfo,
+                        null,
+                        Shared.VertexBatch.Add,
+                        Vector2.Divide(localInflationAmount, size));
                 }
 
                 Shader.Unbind();

osu.Game/Overlays/Chat/ChatTabControl.cs

@@ -14,6 +14,7 @@ using osu.Game.Graphics.UserInterface;
 using osu.Game.Online.Chat;
 using OpenTK;
 using OpenTK.Graphics;
+using osu.Framework.Configuration;
 
 namespace osu.Game.Overlays.Chat
 {
@@ -23,6 +24,8 @@ namespace osu.Game.Overlays.Chat
 
         private const float shear_width = 10;
 
+        public readonly Bindable<bool> ChannelSelectorActive = new Bindable<bool>();
+
         public ChatTabControl()
         {
             TabContainer.Margin = new MarginPadding { Left = 50 };
@@ -37,6 +40,8 @@ namespace osu.Game.Overlays.Chat
                 TextSize = 20,
                 Padding = new MarginPadding(10),
             });
+
+            AddTabItem(new ChannelTabItem.ChannelSelectorTabItem(new Channel { Name = "+" }, ChannelSelectorActive));
         }
 
         private class ChannelTabItem : TabItem<Channel>
@@ -49,6 +54,7 @@ namespace osu.Game.Overlays.Chat
             private readonly SpriteText textBold;
             private readonly Box box;
             private readonly Box highlightBox;
+            private readonly TextAwesome icon;
 
             public override bool Active
             {
@@ -114,6 +120,11 @@ namespace osu.Game.Overlays.Chat
                 backgroundHover = colours.Gray7;
 
                 highlightBox.Colour = colours.Yellow;
+            }
+
+            protected override void LoadComplete()
+            {
+                base.LoadComplete();
 
                 updateState();
             }
@@ -159,7 +170,7 @@ namespace osu.Game.Overlays.Chat
                         RelativeSizeAxes = Axes.Both,
                         Children = new Drawable[]
                         {
-                            new TextAwesome
+                            icon = new TextAwesome
                             {
                                 Icon = FontAwesome.fa_hashtag,
                                 Anchor = Anchor.CentreLeft,
@@ -191,6 +202,40 @@ namespace osu.Game.Overlays.Chat
                     }
                 };
             }
+
+            public class ChannelSelectorTabItem : ChannelTabItem
+            {
+                public override bool Active
+                {
+                    get { return base.Active; }
+                    set
+                    {
+                        activeBindable.Value = value;
+                        base.Active = value;
+                    }
+                }
+
+                private readonly Bindable<bool> activeBindable;
+
+                public ChannelSelectorTabItem(Channel value, Bindable<bool> active) : base(value)
+                {
+                    activeBindable = active;
+                    Depth = float.MaxValue;
+                    Width = 45;
+
+                    icon.Alpha = 0;
+
+                    text.TextSize = 45;
+                    textBold.TextSize = 45;
+                }
+
+                [BackgroundDependencyLoader]
+                private new void load(OsuColour colour)
+                {
+                    backgroundInactive = colour.Gray2;
+                    backgroundActive = colour.Gray3;
+                }
+            }
         }
     }
 }

osu.Game/Overlays/ChatOverlay.cs

@@ -301,6 +301,8 @@ namespace osu.Game.Overlays
             {
                 if (currentChannel == value) return;
 
+                if (channelTabs.ChannelSelectorActive) return;
+
                 if (currentChannel != null)
                     currentChannelContainer.Clear(false);