Create a LargeTextureStore for cached (but not atlased) global textures

Also
- Fixes first transition depth being incorrect.
- Improves smoothness of transitions (and adds a slight delay to offset from screen switches).

osu.Game/Beatmaps/BeatmapManager.cs

@@ -19,6 +19,7 @@ using osu.Game.Beatmaps.Formats;
 using osu.Game.Beatmaps.IO;
 using osu.Game.Database;
 using osu.Game.Graphics;
+using osu.Game.Graphics.Textures;
 using osu.Game.IO;
 using osu.Game.IPC;
 using osu.Game.Online.API;
@@ -651,7 +652,7 @@ namespace osu.Game.Beatmaps
 
                 try
                 {
-                    return new TextureStore(new RawTextureLoaderStore(store), false).Get(getPathForFile(Metadata.BackgroundFile));
+                    return new LargeTextureStore(new RawTextureLoaderStore(store)).Get(getPathForFile(Metadata.BackgroundFile));
                 }
                 catch
                 {

osu.Game/Graphics/Backgrounds/Background.cs

@@ -5,8 +5,8 @@ using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
-using osu.Framework.Graphics.Textures;
 using OpenTK.Graphics;
+using osu.Game.Graphics.Textures;
 
 namespace osu.Game.Graphics.Backgrounds
 {
@@ -22,7 +22,6 @@ namespace osu.Game.Graphics.Backgrounds
 
             this.textureName = textureName;
             RelativeSizeAxes = Axes.Both;
-            Depth = float.MaxValue;
 
             Add(Sprite = new Sprite
             {
@@ -35,7 +34,7 @@ namespace osu.Game.Graphics.Backgrounds
         }
 
         [BackgroundDependencyLoader]
-        private void load(TextureStore textures)
+        private void load(LargeTextureStore textures)
         {
             if (!string.IsNullOrEmpty(textureName))
                 Sprite.Texture = textures.Get(textureName);

osu.Game/Graphics/Textures/LargeTextureStore.cs

@@ -0,0 +1,18 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Framework.Graphics.Textures;
+using osu.Framework.IO.Stores;
+
+namespace osu.Game.Graphics.Textures
+{
+    /// <summary>
+    /// A texture store that bypasses atlasing.
+    /// </summary>
+    public class LargeTextureStore : TextureStore
+    {
+        public LargeTextureStore(IResourceStore<RawTexture> store = null) : base(store, false)
+        {
+        }
+    }
+}

osu.Game/OsuGameBase.cs

@@ -18,8 +18,10 @@ using osu.Game.Graphics;
 using osu.Game.Graphics.Cursor;
 using osu.Game.Online.API;
 using osu.Framework.Graphics.Performance;
+using osu.Framework.Graphics.Textures;
 using osu.Framework.Logging;
 using osu.Game.Database;
+using osu.Game.Graphics.Textures;
 using osu.Game.Input;
 using osu.Game.Input.Bindings;
 using osu.Game.IO;
@@ -84,11 +86,15 @@ namespace osu.Game
 
         private DatabaseContextFactory contextFactory;
 
+        private LargeTextureStore largeTextureStore;
+
         [BackgroundDependencyLoader]
         private void load()
         {
             dependencies.Cache(contextFactory = new DatabaseContextFactory(Host));
 
+            dependencies.Cache(largeTextureStore = new LargeTextureStore(new RawTextureLoaderStore(new NamespacedResourceStore<byte[]>(Resources, @"Textures"))));
+
             dependencies.Cache(this);
             dependencies.Cache(LocalConfig);
 

osu.Game/Screens/Backgrounds/BackgroundScreenDefault.cs

@@ -3,6 +3,7 @@
 
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
+using osu.Framework.Threading;
 using osu.Game.Graphics.Backgrounds;
 
 namespace osu.Game.Screens.Backgrounds
@@ -24,16 +25,22 @@ namespace osu.Game.Screens.Backgrounds
 
         private void display(Background newBackground)
         {
-            current?.FadeOut(800, Easing.OutQuint);
+            current?.FadeOut(800, Easing.InOutSine);
             current?.Expire();
 
             Add(current = newBackground);
+            currentDisplay++;
         }
 
+        private ScheduledDelegate nextTask;
+
         public void Next()
         {
-            currentDisplay++;
+            nextTask?.Cancel();
-            LoadComponentAsync(new Background(backgroundName) { Depth = currentDisplay }, display);
+            nextTask = Scheduler.AddDelayed(() =>
+            {
+                LoadComponentAsync(new Background(backgroundName) { Depth = currentDisplay }, display);
+            }, 100);
         }
     }
 }

osu.Game/osu.Game.csproj

@@ -267,6 +267,7 @@
     <Compile Include="Beatmaps\Formats\LegacyStoryboardDecoder.cs" />
     <Compile Include="Database\DatabaseContextFactory.cs" />
     <Compile Include="Database\IHasPrimaryKey.cs" />
+    <Compile Include="Graphics\Textures\LargeTextureStore.cs" />
     <Compile Include="Overlays\Profile\SupporterIcon.cs" />
     <Compile Include="Overlays\Settings\DangerousSettingsButton.cs" />
     <Compile Include="Graphics\UserInterface\HoverClickSounds.cs" />