Merge pull request #428 from peppy/general-fixes

Log errors with updating.

.editorconfig

@@ -7,3 +7,21 @@ insert_final_newline = true
 indent_style = space
 indent_size = 4
 trim_trailing_whitespace = true
+
+#Roslyn naming styles
+
+#PascalCase for public and protected members
+dotnet_naming_style.pascalcase.capitalization = pascal_case
+dotnet_naming_symbols.public_members.applicable_accessibilities = public,internal,protected,protected_internal
+dotnet_naming_symbols.public_members.applicable_kinds = property,method,field,event,delegate
+dotnet_naming_rule.public_members_pascalcase.severity = suggestion
+dotnet_naming_rule.public_members_pascalcase.symbols = public_members
+dotnet_naming_rule.public_members_pascalcase.style = pascalcase
+
+#camelCase for private members
+dotnet_naming_style.camelcase.capitalization = camel_case
+dotnet_naming_symbols.private_members.applicable_accessibilities = private
+dotnet_naming_symbols.private_members.applicable_kinds = property,method,field,event,delegate
+dotnet_naming_rule.private_members_camelcase.severity = suggestion
+dotnet_naming_rule.private_members_camelcase.symbols = private_members
+dotnet_naming_rule.private_members_camelcase.style = camelcase

.gitignore

@@ -11,7 +11,7 @@
 *.userprefs
 
 # Build results
-[Dd]ebug/
+bin/[Dd]ebug/
 [Dd]ebugPublic/
 [Rr]elease/
 [Rr]eleases/
@@ -255,4 +255,5 @@ paket-files/
 
 # Python Tools for Visual Studio (PTVS)
 __pycache__/
-*.pyc
+*.pyc
+Staging/

LICENCE

@@ -1,6 +1,4 @@
-The MIT License
-
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -18,4 +16,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
+THE SOFTWARE.

osu.Desktop.Deploy/App.config

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <appSettings>
+    <add key="StagingFolder" value="Staging" />
+    <add key="ReleasesFolder" value="Releases" />
+    <add key="GitHubAccessToken" value="" />
+    <add key="GitHubUsername" value="ppy" />
+    <add key="GitHubRepoName" value="osu" />
+    <add key="ProjectName" value="osu.Desktop" />
+    <add key="NuSpecName" value="osu.Desktop\osu.nuspec" />
+    <add key="SolutionName" value="osu" />
+    <add key="TargetName" value="Client\osu.Desktop" />
+    <add key="PackageName" value="osulazer" />
+    <add key="IconName" value="lazer.ico" />
+    <add key="CodeSigningCertificate" value="" />
+  </appSettings>
+  <startup>
+    <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+  </startup>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-9.0.0.0" newVersion="9.0.0.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="DeltaCompressionDotNet.MsDelta" publicKeyToken="46b2138a390abf55" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+</configuration>

osu.Desktop.Deploy/GitHubObject.cs

@@ -0,0 +1,13 @@
+using Newtonsoft.Json;
+
+namespace osu.Desktop.Deploy
+{
+    internal class GitHubObject
+    {
+        [JsonProperty(@"id")]
+        public int Id;
+
+        [JsonProperty(@"name")]
+        public string Name;
+    }
+}

osu.Desktop.Deploy/GitHubRelease.cs

@@ -0,0 +1,25 @@
+using Newtonsoft.Json;
+
+namespace osu.Desktop.Deploy
+{
+    internal class GitHubRelease
+    {
+        [JsonProperty(@"id")]
+        public int Id;
+
+        [JsonProperty(@"tag_name")]
+        public string TagName => $"v{Name}";
+
+        [JsonProperty(@"name")]
+        public string Name;
+
+        [JsonProperty(@"draft")]
+        public bool Draft;
+
+        [JsonProperty(@"prerelease")]
+        public bool PreRelease;
+
+        [JsonProperty(@"upload_url")]
+        public string UploadUrl;
+    }
+}

osu.Desktop.Deploy/Program.cs

@@ -0,0 +1,420 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.GitHubusercontent.com/ppy/osu-framework/master/LICENCE
+
+using System;
+using System.Collections.Generic;
+using System.Configuration;
+using System.Diagnostics;
+using System.IO;
+using System.Linq;
+using System.Net;
+using Newtonsoft.Json;
+using osu.Framework.IO.Network;
+using FileWebRequest = osu.Framework.IO.Network.FileWebRequest;
+using WebRequest = osu.Framework.IO.Network.WebRequest;
+
+namespace osu.Desktop.Deploy
+{
+    internal static class Program
+    {
+        private const string nuget_path = @"packages\NuGet.CommandLine.3.5.0\tools\NuGet.exe";
+        private const string squirrel_path = @"packages\squirrel.windows.1.5.2\tools\Squirrel.exe";
+        private const string msbuild_path = @"C:\Program Files (x86)\MSBuild\14.0\Bin\MSBuild.exe";
+
+        public static string StagingFolder = ConfigurationManager.AppSettings["StagingFolder"];
+        public static string ReleasesFolder = ConfigurationManager.AppSettings["ReleasesFolder"];
+        public static string GitHubAccessToken = ConfigurationManager.AppSettings["GitHubAccessToken"];
+        public static string GitHubUsername = ConfigurationManager.AppSettings["GitHubUsername"];
+        public static string GitHubRepoName = ConfigurationManager.AppSettings["GitHubRepoName"];
+        public static string SolutionName = ConfigurationManager.AppSettings["SolutionName"];
+        public static string ProjectName = ConfigurationManager.AppSettings["ProjectName"];
+        public static string NuSpecName = ConfigurationManager.AppSettings["NuSpecName"];
+        public static string TargetName = ConfigurationManager.AppSettings["TargetName"];
+        public static string PackageName = ConfigurationManager.AppSettings["PackageName"];
+        public static string IconName = ConfigurationManager.AppSettings["IconName"];
+        public static string CodeSigningCertificate = ConfigurationManager.AppSettings["CodeSigningCertificate"];
+
+        public static string GitHubApiEndpoint => $"https://api.github.com/repos/{GitHubUsername}/{GitHubRepoName}/releases";
+        public static string GitHubReleasePage => $"https://github.com/{GitHubUsername}/{GitHubRepoName}/releases";
+
+        /// <summary>
+        /// How many previous build deltas we want to keep when publishing.
+        /// </summary>
+        const int keep_delta_count = 3;
+
+        private static string codeSigningCmd => string.IsNullOrEmpty(codeSigningPassword) ? "" : $"-n \"/a /f {codeSigningCertPath} /p {codeSigningPassword} /t http://timestamp.comodoca.com/authenticode\"";
+
+        private static string homeDir => Environment.GetFolderPath(Environment.SpecialFolder.UserProfile);
+        private static string codeSigningCertPath => Path.Combine(homeDir, CodeSigningCertificate);
+        private static string solutionPath => Environment.CurrentDirectory;
+        private static string stagingPath => Path.Combine(solutionPath, StagingFolder);
+        private static string iconPath => Path.Combine(solutionPath, ProjectName, IconName);
+
+        private static string nupkgFilename(string ver) => $"{PackageName}.{ver}.nupkg";
+        private static string nupkgDistroFilename(string ver) => $"{PackageName}-{ver}-full.nupkg";
+
+        private static Stopwatch sw = new Stopwatch();
+
+        private static string codeSigningPassword;
+
+        public static void Main(string[] args)
+        {
+            displayHeader();
+
+            findSolutionPath();
+
+            if (!Directory.Exists(ReleasesFolder))
+            {
+                write("WARNING: No release directory found. Make sure you want this!", ConsoleColor.Yellow);
+                Directory.CreateDirectory(ReleasesFolder);
+            }
+
+            checkGitHubReleases();
+
+            refreshDirectory(StagingFolder);
+
+            //increment build number until we have a unique one.
+            string verBase = DateTime.Now.ToString("yyyy.Mdd.");
+            int increment = 0;
+            while (Directory.GetFiles(ReleasesFolder, $"*{verBase}{increment}*").Any())
+                increment++;
+
+            string version = $"{verBase}{increment}";
+
+            Console.ForegroundColor = ConsoleColor.White;
+            Console.Write($"Ready to deploy {version}: ");
+            Console.ReadLine();
+
+            sw.Start();
+
+            if (!string.IsNullOrEmpty(CodeSigningCertificate))
+            {
+                Console.Write("Enter code signing password: ");
+                codeSigningPassword = readLineMasked();
+            }
+
+            write("Restoring NuGet packages...");
+            runCommand(nuget_path, "restore " + solutionPath);
+
+            write("Updating AssemblyInfo...");
+            updateAssemblyInfo(version);
+
+            write("Running build process...");
+            runCommand(msbuild_path, $"/v:quiet /m /t:{TargetName.Replace('.', '_')} /p:OutputPath={stagingPath};Configuration=Release {SolutionName}.sln");
+
+            write("Creating NuGet deployment package...");
+            runCommand(nuget_path, $"pack {NuSpecName} -Version {version} -Properties Configuration=Deploy -OutputDirectory {stagingPath} -BasePath {stagingPath}");
+
+            //prune once before checking for files so we can avoid erroring on files which aren't even needed for this build.
+            pruneReleases();
+
+            checkReleaseFiles();
+
+            write("Running squirrel build...");
+            runCommand(squirrel_path, $"--releasify {stagingPath}\\{nupkgFilename(version)} --setupIcon {iconPath} --icon {iconPath} {codeSigningCmd} --no-msi");
+
+            //prune again to clean up before upload.
+            pruneReleases();
+
+            //rename setup to install.
+            File.Copy(Path.Combine(ReleasesFolder, "Setup.exe"), Path.Combine(ReleasesFolder, "install.exe"), true);
+            File.Delete(Path.Combine(ReleasesFolder, "Setup.exe"));
+
+            uploadBuild(version);
+
+            //reset assemblyinfo.
+            updateAssemblyInfo("0.0.0");
+
+            write("Done!", ConsoleColor.White);
+            Console.ReadLine();
+        }
+
+        private static void displayHeader()
+        {
+            Console.ForegroundColor = ConsoleColor.Red;
+            Console.WriteLine();
+            Console.WriteLine("  Please note that OSU! and PPY are registered trademarks and as such covered by trademark law.");
+            Console.WriteLine("  Do not distribute builds of this project publicly that make use of these.");
+            Console.ResetColor();
+            Console.WriteLine();
+        }
+
+        /// <summary>
+        /// Ensure we have all the files in the release directory which are expected to be there.
+        /// This should have been accounted for in earlier steps, and just serves as a verification step.
+        /// </summary>
+        private static void checkReleaseFiles()
+        {
+            var releaseLines = getReleaseLines();
+
+            //ensure we have all files necessary
+            foreach (var l in releaseLines)
+                if (!File.Exists(Path.Combine(ReleasesFolder, l.Filename)))
+                    error($"Local file missing {l.Filename}");
+        }
+
+        private static IEnumerable<ReleaseLine> getReleaseLines() => File.ReadAllLines(Path.Combine(ReleasesFolder, "RELEASES")).Select(l => new ReleaseLine(l));
+
+        private static void pruneReleases()
+        {
+            write("Pruning RELEASES...");
+
+            var releaseLines = getReleaseLines().ToList();
+
+            var fulls = releaseLines.Where(l => l.Filename.Contains("-full")).Reverse().Skip(1);
+
+            //remove any FULL releases (except most recent)
+            foreach (var l in fulls)
+            {
+                write($"- Removing old release {l.Filename}", ConsoleColor.Yellow);
+                File.Delete(Path.Combine(ReleasesFolder, l.Filename));
+                releaseLines.Remove(l);
+            }
+
+            //remove excess deltas
+            var deltas = releaseLines.Where(l => l.Filename.Contains("-delta"));
+            if (deltas.Count() > keep_delta_count)
+            {
+                foreach (var l in deltas.Take(deltas.Count() - keep_delta_count))
+                {
+                    write($"- Removing old delta {l.Filename}", ConsoleColor.Yellow);
+                    File.Delete(Path.Combine(ReleasesFolder, l.Filename));
+                    releaseLines.Remove(l);
+                }
+            }
+
+            var lines = new List<string>();
+            releaseLines.ForEach(l => lines.Add(l.ToString()));
+            File.WriteAllLines(Path.Combine(ReleasesFolder, "RELEASES"), lines);
+        }
+
+        private static void uploadBuild(string version)
+        {
+            if (string.IsNullOrEmpty(GitHubAccessToken) || string.IsNullOrEmpty(codeSigningCertPath))
+                return;
+
+            write("Publishing to GitHub...");
+
+            write($"- Creating release {version}...", ConsoleColor.Yellow);
+            var req = new JsonWebRequest<GitHubRelease>($"{GitHubApiEndpoint}")
+            {
+                Method = HttpMethod.POST
+            };
+            req.AddRaw(JsonConvert.SerializeObject(new GitHubRelease
+            {
+                Name = version,
+                Draft = true,
+                PreRelease = true
+            }));
+            req.AuthenticatedBlockingPerform();
+
+            var assetUploadUrl = req.ResponseObject.UploadUrl.Replace("{?name,label}", "?name={0}");
+            foreach (var a in Directory.GetFiles(ReleasesFolder).Reverse()) //reverse to upload RELEASES first.
+            {
+                write($"- Adding asset {a}...", ConsoleColor.Yellow);
+                var upload = new WebRequest(assetUploadUrl, Path.GetFileName(a))
+                {
+                    Method = HttpMethod.POST,
+                    ContentType = "application/octet-stream",
+                };
+
+                upload.AddRaw(File.ReadAllBytes(a));
+                upload.AuthenticatedBlockingPerform();
+            }
+
+            openGitHubReleasePage();
+        }
+
+        private static void openGitHubReleasePage() => Process.Start(GitHubReleasePage);
+
+        private static void checkGitHubReleases()
+        {
+            write("Checking GitHub releases...");
+            var req = new JsonWebRequest<List<GitHubRelease>>($"{GitHubApiEndpoint}");
+            req.AuthenticatedBlockingPerform();
+
+            var lastRelease = req.ResponseObject.FirstOrDefault();
+
+            if (lastRelease == null)
+                return;
+
+            if (lastRelease.Draft)
+            {
+                openGitHubReleasePage();
+                error("There's a pending draft release! You probably don't want to push a build with this present.");
+            }
+
+            //there's a previous release for this project.
+            var assetReq = new JsonWebRequest<List<GitHubObject>>($"{GitHubApiEndpoint}/{lastRelease.Id}/assets");
+            assetReq.AuthenticatedBlockingPerform();
+            var assets = assetReq.ResponseObject;
+
+            //make sure our RELEASES file is the same as the last build on the server.
+            var releaseAsset = assets.FirstOrDefault(a => a.Name == "RELEASES");
+
+            //if we don't have a RELEASES asset then the previous release likely wasn't a Squirrel one.
+            if (releaseAsset == null) return;
+
+            write($"Last GitHub release was {lastRelease.Name}.");
+
+            bool requireDownload = false;
+
+            if (!File.Exists(Path.Combine(ReleasesFolder, nupkgDistroFilename(lastRelease.Name))))
+            {
+                write("Last verion's package not found locally.", ConsoleColor.Red);
+                requireDownload = true;
+            }
+            else
+            {
+                var lastReleases = new RawFileWebRequest($"{GitHubApiEndpoint}/assets/{releaseAsset.Id}");
+                lastReleases.AuthenticatedBlockingPerform();
+                if (File.ReadAllText(Path.Combine(ReleasesFolder, "RELEASES")) != lastReleases.ResponseString)
+                {
+                    write("Server's RELEASES differed from ours.", ConsoleColor.Red);
+                    requireDownload = true;
+                }
+            }
+
+            if (!requireDownload) return;
+
+            write("Refreshing local releases directory...");
+            refreshDirectory(ReleasesFolder);
+
+            foreach (var a in assets)
+            {
+                write($"- Downloading {a.Name}...", ConsoleColor.Yellow);
+                new FileWebRequest(Path.Combine(ReleasesFolder, a.Name), $"{GitHubApiEndpoint}/assets/{a.Id}").AuthenticatedBlockingPerform();
+            }
+        }
+
+        private static void refreshDirectory(string directory)
+        {
+            if (Directory.Exists(directory))
+                Directory.Delete(directory, true);
+            Directory.CreateDirectory(directory);
+        }
+
+        private static void updateAssemblyInfo(string version)
+        {
+            string file = Path.Combine(ProjectName, "Properties", "AssemblyInfo.cs");
+
+            var l1 = File.ReadAllLines(file);
+            List<string> l2 = new List<string>();
+            foreach (var l in l1)
+            {
+                if (l.StartsWith("[assembly: AssemblyVersion("))
+                    l2.Add($"[assembly: AssemblyVersion(\"{version}\")]");
+                else if (l.StartsWith("[assembly: AssemblyFileVersion("))
+                    l2.Add($"[assembly: AssemblyFileVersion(\"{version}\")]");
+                else
+                    l2.Add(l);
+            }
+
+            File.WriteAllLines(file, l2);
+        }
+
+        /// <summary>
+        /// Find the base path of the active solution (git checkout location)
+        /// </summary>
+        private static void findSolutionPath()
+        {
+            string path = Path.GetDirectoryName(Environment.CommandLine.Replace("\"", "").Trim());
+
+            if (string.IsNullOrEmpty(path))
+                path = Environment.CurrentDirectory;
+
+            while (!File.Exists(Path.Combine(path, $"{SolutionName}.sln")))
+                path = path.Remove(path.LastIndexOf('\\'));
+            path += "\\";
+
+            Environment.CurrentDirectory = path;
+        }
+
+        private static bool runCommand(string command, string args)
+        {
+            var psi = new ProcessStartInfo(command, args)
+            {
+                WorkingDirectory = solutionPath,
+                CreateNoWindow = true,
+                RedirectStandardOutput = true,
+                UseShellExecute = false,
+                WindowStyle = ProcessWindowStyle.Hidden
+            };
+
+            Process p = Process.Start(psi);
+            string output = p.StandardOutput.ReadToEnd();
+            if (p.ExitCode == 0) return true;
+
+            write(output);
+            error($"Command {command} {args} failed!");
+            return false;
+        }
+
+        private static string readLineMasked()
+        {
+            var fg = Console.ForegroundColor;
+            Console.ForegroundColor = Console.BackgroundColor;
+            var ret = Console.ReadLine();
+            Console.ForegroundColor = fg;
+
+            return ret;
+        }
+
+        private static void error(string message)
+        {
+            Console.ForegroundColor = ConsoleColor.Red;
+            Console.WriteLine($"FATAL ERROR: {message}");
+
+            Console.ReadLine();
+            Environment.Exit(-1);
+        }
+
+        private static void write(string message, ConsoleColor col = ConsoleColor.Gray)
+        {
+            if (sw.ElapsedMilliseconds > 0)
+            {
+                Console.ForegroundColor = ConsoleColor.Green;
+                Console.Write(sw.ElapsedMilliseconds.ToString().PadRight(8));
+            }
+            Console.ForegroundColor = col;
+            Console.WriteLine(message);
+        }
+
+        public static void AuthenticatedBlockingPerform(this WebRequest r)
+        {
+            r.AddHeader("Authorization", $"token {GitHubAccessToken}");
+            r.BlockingPerform();
+        }
+    }
+
+    internal class RawFileWebRequest : WebRequest
+    {
+        public RawFileWebRequest(string url) : base(url)
+        {
+        }
+
+        protected override HttpWebRequest CreateWebRequest(string requestString = null)
+        {
+            var req = base.CreateWebRequest(requestString);
+            req.Accept = "application/octet-stream";
+            return req;
+        }
+    }
+
+    internal class ReleaseLine
+    {
+        public string Hash;
+        public string Filename;
+        public int Filesize;
+
+        public ReleaseLine(string line)
+        {
+            var split = line.Split(' ');
+            Hash = split[0];
+            Filename = split[1];
+            Filesize = int.Parse(split[2]);
+        }
+
+        public override string ToString() => $"{Hash} {Filename} {Filesize}";
+    }
+}

osu.Desktop.Deploy/Properties/AssemblyInfo.cs

@@ -0,0 +1,35 @@
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("osu.Desktop.Deploy")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("osu.Desktop.Deploy")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("baea2f74-0315-4667-84e0-acac0b4bf785")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

osu.Desktop.Deploy/osu.Desktop.Deploy.csproj

@@ -0,0 +1,125 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{BAEA2F74-0315-4667-84E0-ACAC0B4BF785}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>osu.Desktop.Deploy</RootNamespace>
+    <AssemblyName>osu.Desktop.Deploy</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup>
+    <StartupObject>osu.Desktop.Deploy.Program</StartupObject>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="DeltaCompressionDotNet, Version=1.1.0.0, Culture=neutral, PublicKeyToken=1d14d6e5194e7f4a, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\DeltaCompressionDotNet.1.1.0\lib\net20\DeltaCompressionDotNet.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="DeltaCompressionDotNet.MsDelta, Version=1.1.0.0, Culture=neutral, PublicKeyToken=46b2138a390abf55, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\DeltaCompressionDotNet.1.1.0\lib\net20\DeltaCompressionDotNet.MsDelta.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="DeltaCompressionDotNet.PatchApi, Version=1.1.0.0, Culture=neutral, PublicKeyToken=3e8888ee913ed789, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\DeltaCompressionDotNet.1.1.0\lib\net20\DeltaCompressionDotNet.PatchApi.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="ICSharpCode.SharpZipLib, Version=0.86.0.518, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\squirrel.windows.1.5.2\lib\Net45\ICSharpCode.SharpZipLib.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Mono.Cecil, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.9.6.4\lib\net45\Mono.Cecil.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Mono.Cecil.Mdb, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.9.6.4\lib\net45\Mono.Cecil.Mdb.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Mono.Cecil.Pdb, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.9.6.4\lib\net45\Mono.Cecil.Pdb.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Mono.Cecil.Rocks, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.9.6.4\lib\net45\Mono.Cecil.Rocks.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Newtonsoft.Json, Version=9.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Newtonsoft.Json.9.0.1\lib\net45\Newtonsoft.Json.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="NuGet.Squirrel, Version=3.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\squirrel.windows.1.5.2\lib\Net45\NuGet.Squirrel.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Splat, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Splat.2.0.0\lib\Net45\Splat.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Squirrel, Version=1.5.2.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\squirrel.windows.1.5.2\lib\Net45\Squirrel.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.Configuration" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="GitHubObject.cs" />
+    <Compile Include="GitHubRelease.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\osu-framework\osu.Framework.Desktop\osu.Framework.Desktop.csproj">
+      <Project>{65dc628f-a640-4111-ab35-3a5652bc1e17}</Project>
+      <Name>osu.Framework.Desktop</Name>
+    </ProjectReference>
+    <ProjectReference Include="..\osu-framework\osu.Framework\osu.Framework.csproj">
+      <Project>{C76BF5B3-985E-4D39-95FE-97C9C879B83A}</Project>
+      <Name>osu.Framework</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

osu.Desktop.Deploy/packages.config

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="DeltaCompressionDotNet" version="1.1.0" targetFramework="net452" />
+  <package id="Mono.Cecil" version="0.9.6.4" targetFramework="net452" />
+  <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net452" />
+  <package id="NuGet.CommandLine" version="3.5.0" targetFramework="net452" developmentDependency="true" />
+  <package id="Splat" version="2.0.0" targetFramework="net452" />
+  <package id="squirrel.windows" version="1.5.2" targetFramework="net452" />
+</packages>

osu.Desktop.Tests/BenchmarkTest.cs

@@ -25,8 +25,7 @@ namespace osu.Desktop.Tests
                 Ruleset.Register(new ManiaRuleset());
                 Ruleset.Register(new CatchRuleset());
 
-                host.Add(new Benchmark());
-                host.Run();
+                host.Run(new Benchmark());
             }
         }
     }

osu.Desktop.Tests/app.config

@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+-->
 <configuration>
   <runtime>
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

osu.Desktop.Tests/osu.Desktop.Tests.csproj

@@ -34,7 +34,7 @@
   <ItemGroup>
     <Reference Include="mscorlib" />
     <Reference Include="nunit.framework, Version=3.5.0.0, Culture=neutral, PublicKeyToken=2638cd05610744eb, processorArchitecture=MSIL">
-      <HintPath>..\packages\NUnit.3.5.0\lib\net45\nunit.framework.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\NUnit.3.5.0\lib\net45\nunit.framework.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="SQLite.Net, Version=3.1.0.0, Culture=neutral, processorArchitecture=MSIL">
@@ -54,9 +54,6 @@
     <Reference Include="SQLite.Net.Platform.Generic">
       <HintPath>$(SolutionDir)\packages\SQLite.Net-PCL.3.1.1\lib\net40\SQLite.Net.Platform.Generic.dll</HintPath>
     </Reference>
-    <Reference Include="OpenTK">
-      <HintPath>$(SolutionDir)\packages\ppy.OpenTK.2.0.50727.1339\lib\net45\OpenTK.dll</HintPath>
-    </Reference>
   </ItemGroup>
   <ItemGroup>
     <Compile Include="BenchmarkTest.cs" />
@@ -100,6 +97,9 @@
     </ProjectReference>
   </ItemGroup>
   <ItemGroup>
+    <None Include="..\osu.licenseheader">
+      <Link>osu.licenseheader</Link>
+    </None>
     <None Include="app.config" />
     <None Include="packages.config" />
   </ItemGroup>

osu.Desktop.Tests/packages.config

@@ -1,4 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!--
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+-->
 <packages>
   <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net45" />
   <package id="NUnit" version="3.5.0" targetFramework="net45" />

osu.Desktop.VisualTests/Benchmark.cs

@@ -2,20 +2,9 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-using osu.Framework;
 using osu.Framework.Allocation;
-using osu.Framework.Desktop.Platform;
-using osu.Framework.GameModes.Testing;
+using osu.Framework.Screens.Testing;
 using osu.Game;
-using osu.Game.Modes;
-using osu.Game.Modes.Catch;
-using osu.Game.Modes.Mania;
-using osu.Game.Modes.Osu;
-using osu.Game.Modes.Taiko;
 
 namespace osu.Desktop.VisualTests
 {
@@ -24,7 +13,7 @@ namespace osu.Desktop.VisualTests
         private double timePerTest = 200;
 
         [BackgroundDependencyLoader]
-        private void load(BaseGame game)
+        private void load()
         {
             Host.MaximumDrawHz = int.MaxValue;
             Host.MaximumUpdateHz = int.MaxValue;

osu.Desktop.VisualTests/OpenTK.dll.config

@@ -1,8 +1,7 @@
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
-
 <configuration>
   <dllmap os="linux" dll="opengl32.dll" target="libGL.so.1"/>
   <dllmap os="linux" dll="glu32.dll" target="libGLU.so.1"/>

osu.Desktop.VisualTests/Program.cs

@@ -3,7 +3,6 @@
 
 using System;
 using osu.Framework.Desktop;
-using osu.Framework.Desktop.Platform;
 using osu.Framework.Platform;
 using osu.Game.Modes;
 using osu.Game.Modes.Catch;
@@ -20,7 +19,7 @@ namespace osu.Desktop.VisualTests
         {
             bool benchmark = args.Length > 0 && args[0] == @"-benchmark";
 
-            using (BasicGameHost host = Host.GetSuitableHost(@"osu"))
+            using (GameHost host = Host.GetSuitableHost(@"osu"))
             {
                 Ruleset.Register(new OsuRuleset());
                 Ruleset.Register(new TaikoRuleset());
@@ -28,10 +27,9 @@ namespace osu.Desktop.VisualTests
                 Ruleset.Register(new CatchRuleset());
 
                 if (benchmark)
-                    host.Add(new Benchmark());
+                    host.Run(new Benchmark());
                 else
-                    host.Add(new VisualTestGame());
-                host.Run();
+                    host.Run(new VisualTestGame());
             }
         }
     }

osu.Desktop.VisualTests/Tests/TestCaseBeatmapOptionsOverlay.cs

@@ -0,0 +1,28 @@
+// 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;
+using osu.Framework.Screens.Testing;
+using osu.Game.Graphics;
+using osu.Game.Overlays;
+using osu.Game.Screens.Select.Options;
+
+namespace osu.Desktop.VisualTests
+{
+    class TestCaseBeatmapOptionsOverlay : TestCase
+    {
+        public override string Name => @"Beatmap Options";
+        public override string Description => @"Beatmap options in song select";
+
+        public override void Reset()
+        {
+            base.Reset();
+
+            var overlay = new BeatmapOptionsOverlay();
+
+            Add(overlay);
+
+            AddButton(@"Toggle", overlay.ToggleVisibility);
+        }
+    }
+}

osu.Desktop.VisualTests/Tests/TestCaseChatDisplay.cs

@@ -1,22 +1,10 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Linq;
-using osu.Framework;
-using osu.Framework.GameModes.Testing;
-using osu.Framework.Graphics;
+using osu.Framework.Screens.Testing;
 using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Sprites;
 using osu.Framework.Threading;
-using osu.Game;
-using osu.Game.Online.API;
-using osu.Game.Online.API.Requests;
-using osu.Game.Online.Chat;
-using OpenTK;
-using osu.Framework.Allocation;
-using osu.Game.Online.Chat.Drawables;
+using osu.Game.Overlays;
 
 namespace osu.Desktop.VisualTests.Tests
 {
@@ -25,119 +13,16 @@ namespace osu.Desktop.VisualTests.Tests
         private ScheduledDelegate messageRequest;
 
         public override string Name => @"Chat";
-        public override string Description => @"Testing API polling";
-
-        FlowContainer flow;
-
-        private Scheduler scheduler = new Scheduler();
-
-        private APIAccess api;
-
-        private ChannelDisplay channelDisplay;
-
-        [BackgroundDependencyLoader]
-        private void load(APIAccess api)
-        {
-            this.api = api;
-        }
+        public override string Description => @"Testing chat api and overlay";
 
         public override void Reset()
         {
             base.Reset();
 
-            if (api.State != APIState.Online)
-                api.OnStateChange += delegate { initializeChannels(); };
-            else
-                initializeChannels();
-        }
-
-        protected override void Update()
-        {
-            scheduler.Update();
-            base.Update();
-        }
-
-        private long? lastMessageId;
-
-        List<Channel> careChannels;
-
-        private void initializeChannels()
-        {
-            careChannels = new List<Channel>();
-
-            if (api.State != APIState.Online)
-                return;
-
-            Add(flow = new FlowContainer
+            Add(new ChatOverlay()
             {
-                RelativeSizeAxes = Axes.Both,
-                Direction = FlowDirection.VerticalOnly
+                State = Visibility.Visible
             });
-
-            SpriteText loading;
-            Add(loading = new SpriteText
-            {
-                Text = @"Loading available channels...",
-                Anchor = Anchor.Centre,
-                Origin = Anchor.Centre,
-                TextSize = 40,
-            });
-
-            messageRequest?.Cancel();
-
-            ListChannelsRequest req = new ListChannelsRequest();
-            req.Success += delegate (List<Channel> channels)
-            {
-                Scheduler.Add(delegate
-                {
-                    loading.FadeOut(100);
-                });
-
-                addChannel(channels.Find(c => c.Name == @"#osu"));
-                addChannel(channels.Find(c => c.Name == @"#lobby"));
-                addChannel(channels.Find(c => c.Name == @"#english"));
-
-                messageRequest = scheduler.AddDelayed(() => FetchNewMessages(api), 1000, true);
-            };
-            api.Queue(req);
-        }
-
-        private void addChannel(Channel channel)
-        {
-            flow.Add(channelDisplay = new ChannelDisplay(channel)
-            {
-                Size = new Vector2(1, 0.3f)
-            });
-
-            careChannels.Add(channel);
-        }
-
-        GetMessagesRequest fetchReq;
-
-        public void FetchNewMessages(APIAccess api)
-        {
-            if (fetchReq != null) return;
-
-            fetchReq = new GetMessagesRequest(careChannels, lastMessageId);
-            fetchReq.Success += delegate (List<Message> messages)
-            {
-                foreach (Message m in messages)
-                {
-                    careChannels.Find(c => c.Id == m.ChannelId).AddNewMessages(m);
-                }
-
-                lastMessageId = messages.LastOrDefault()?.Id ?? lastMessageId;
-
-                Debug.Write("success!");
-                fetchReq = null;
-            };
-            fetchReq.Failure += delegate
-            {
-                Debug.Write("failure!");
-                fetchReq = null;
-            };
-
-            api.Queue(fetchReq);
         }
     }
 }

osu.Desktop.VisualTests/Tests/TestCaseDialogOverlay.cs

@@ -0,0 +1,80 @@
+// 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;
+using osu.Framework.Screens.Testing;
+using osu.Game.Graphics;
+using osu.Game.Overlays;
+using osu.Game.Overlays.Dialog;
+
+namespace osu.Desktop.VisualTests.Tests
+{
+    class TestCaseDialogOverlay : TestCase
+    {
+        public override string Name => @"Dialog Overlay";
+        public override string Description => @"Display dialogs";
+
+        DialogOverlay overlay;
+
+        public override void Reset()
+        {
+            base.Reset();
+
+            Add(overlay = new DialogOverlay());
+
+            AddButton("dialog #1", () => overlay.Push(new PopupDialog
+            {
+                Icon = FontAwesome.fa_trash_o,
+                HeaderText = @"Confirm deletion of",
+                BodyText = @"Ayase Rie - Yuima-ru*World TVver.",
+                Buttons = new PopupDialogButton[]
+                {
+                    new PopupDialogOkButton
+                    {
+                        Text = @"I never want to see this again.",
+                        Action = () => System.Console.WriteLine(@"OK"),
+                    },
+                    new PopupDialogCancelButton
+                    {
+                        Text = @"Firetruck, I still want quick ranks!",
+                        Action = () => System.Console.WriteLine(@"Cancel"),
+                    },
+                },
+            }));
+
+            AddButton("dialog #2", () => overlay.Push(new PopupDialog
+            {
+                Icon = FontAwesome.fa_gear,
+                HeaderText = @"What do you want to do with",
+                BodyText = "Camellia as \"Bang Riot\" - Blastix Riotz",
+                Buttons = new PopupDialogButton[]
+                {
+                    new PopupDialogOkButton
+                    {
+                        Text = @"Manage collections",
+                    },
+                    new PopupDialogOkButton
+                    {
+                        Text = @"Delete...",
+                    },
+                    new PopupDialogOkButton
+                    {
+                        Text = @"Remove from unplayed",
+                    },
+                    new PopupDialogOkButton
+                    {
+                        Text = @"Clear local scores",
+                    },
+                    new PopupDialogOkButton
+                    {
+                        Text = @"Edit",
+                    },
+                    new PopupDialogCancelButton
+                    {
+                        Text = @"Cancel",
+                    },
+                },
+            }));
+        }
+    }
+}

osu.Desktop.VisualTests/Tests/TestCaseDrawings.cs

@@ -0,0 +1,94 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu-framework/master/LICENCE
+
+using System.Collections.Generic;
+using osu.Framework.Allocation;
+using osu.Framework.Platform;
+using osu.Framework.Screens.Testing;
+using osu.Game.Screens.Tournament;
+using osu.Game.Screens.Tournament.Teams;
+
+namespace osu.Desktop.VisualTests.Tests
+{
+    class TestCaseDrawings : TestCase
+    {
+        public override string Name => @"Drawings";
+        public override string Description => "Tournament drawings";
+
+        [BackgroundDependencyLoader]
+        private void load(Storage storage)
+        {
+        }
+
+        public override void Reset()
+        {
+            base.Reset();
+
+            Add(new Drawings
+            {
+                TeamList = new TestTeamList(),
+            });
+        }
+
+        class TestTeamList : ITeamList
+        {
+            public IEnumerable<Team> Teams { get; } = new[]
+            {
+                new Team
+                {
+                    FlagName = "GB",
+                    FullName = "United Kingdom",
+                    Acronym = "UK"
+                },
+                new Team
+                {
+                    FlagName = "FR",
+                    FullName = "France",
+                    Acronym = "FRA"
+                },
+                new Team
+                {
+                    FlagName = "CN",
+                    FullName = "China",
+                    Acronym = "CHN"
+                },
+                new Team
+                {
+                    FlagName = "AU",
+                    FullName = "Australia",
+                    Acronym = "AUS"
+                },
+                new Team
+                {
+                    FlagName = "JP",
+                    FullName = "Japan",
+                    Acronym = "JPN"
+                },
+                new Team
+                {
+                    FlagName = "RO",
+                    FullName = "Romania",
+                    Acronym = "ROM"
+                },
+                new Team
+                {
+                    FlagName = "IT",
+                    FullName = "Italy",
+                    Acronym = "PIZZA"
+                },
+                new Team
+                {
+                    FlagName = "VE",
+                    FullName = "Venezuela",
+                    Acronym = "VNZ"
+                },
+                new Team
+                {
+                    FlagName = "US",
+                    FullName = "United States of America",
+                    Acronym = "USA"
+                },
+            };
+        }
+    }
+}

osu.Desktop.VisualTests/Tests/TestCaseGamefield.cs

@@ -2,20 +2,17 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System.Collections.Generic;
-using osu.Framework.GameModes.Testing;
+using osu.Framework.Screens.Testing;
 using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
 using osu.Framework.MathUtils;
 using osu.Framework.Timing;
 using osu.Game.Beatmaps;
-using osu.Game.Modes.Catch;
 using osu.Game.Modes.Catch.UI;
-using osu.Game.Modes.Mania;
 using osu.Game.Modes.Mania.UI;
 using osu.Game.Modes.Objects;
-using osu.Game.Modes.Osu;
 using osu.Game.Modes.Osu.Objects;
 using osu.Game.Modes.Osu.UI;
-using osu.Game.Modes.Taiko;
 using osu.Game.Modes.Taiko.UI;
 using OpenTK;
 
@@ -31,9 +28,6 @@ namespace osu.Desktop.VisualTests.Tests
         {
             base.Reset();
 
-            //ensure we are at offset 0
-            Clock = new FramedClock();
-
             List<HitObject> objects = new List<HitObject>();
 
             int time = 500;
@@ -56,33 +50,42 @@ namespace osu.Desktop.VisualTests.Tests
 
             Add(new Drawable[]
             {
-                new OsuHitRenderer
+                new Container
                 {
-                    Beatmap = beatmap,
-                    Scale = new Vector2(0.5f),
-                    Anchor = Anchor.TopLeft,
-                    Origin = Anchor.TopLeft
-                },
-                new TaikoHitRenderer
-                {
-                    Beatmap = beatmap,
-                    Scale = new Vector2(0.5f),
-                    Anchor = Anchor.TopRight,
-                    Origin = Anchor.TopRight
-                },
-                new CatchHitRenderer
-                {
-                    Beatmap = beatmap,
-                    Scale = new Vector2(0.5f),
-                    Anchor = Anchor.BottomLeft,
-                    Origin = Anchor.BottomLeft
-                },
-                new ManiaHitRenderer
-                {
-                    Beatmap = beatmap,
-                    Scale = new Vector2(0.5f),
-                    Anchor = Anchor.BottomRight,
-                    Origin = Anchor.BottomRight
+                    RelativeSizeAxes = Axes.Both,
+                    //ensure we are at offset 0
+                    Clock = new FramedClock(),
+                    Children = new Drawable[]
+                    {
+                        new OsuHitRenderer
+                        {
+                            Beatmap = beatmap,
+                            Scale = new Vector2(0.5f),
+                            Anchor = Anchor.TopLeft,
+                            Origin = Anchor.TopLeft
+                        },
+                        new TaikoHitRenderer
+                        {
+                            Beatmap = beatmap,
+                            Scale = new Vector2(0.5f),
+                            Anchor = Anchor.TopRight,
+                            Origin = Anchor.TopRight
+                        },
+                        new CatchHitRenderer
+                        {
+                            Beatmap = beatmap,
+                            Scale = new Vector2(0.5f),
+                            Anchor = Anchor.BottomLeft,
+                            Origin = Anchor.BottomLeft
+                        },
+                        new ManiaHitRenderer
+                        {
+                            Beatmap = beatmap,
+                            Scale = new Vector2(0.5f),
+                            Anchor = Anchor.BottomRight,
+                            Origin = Anchor.BottomRight
+                        }
+                    }
                 }
             });
         }

osu.Desktop.VisualTests/Tests/TestCaseHitObjects.cs

@@ -1,18 +1,19 @@
 // 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;
-using osu.Framework.GameModes.Testing;
+using System.Collections.Generic;
+using osu.Framework.Screens.Testing;
 using osu.Framework.Graphics;
 using osu.Framework.Timing;
 using OpenTK;
-using osu.Framework.Allocation;
-using osu.Game.Modes.Objects;
+using osu.Framework.Configuration;
 using osu.Game.Modes.Objects.Drawables;
 using osu.Game.Modes.Osu.Objects;
 using osu.Game.Modes.Osu.Objects.Drawables;
 using osu.Framework.Graphics.Containers;
-using osu.Game.Modes;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.UserInterface;
+using OpenTK.Graphics;
 
 namespace osu.Desktop.VisualTests.Tests
 {
@@ -20,44 +21,125 @@ namespace osu.Desktop.VisualTests.Tests
     {
         public override string Name => @"Hit Objects";
 
+        private StopwatchClock rateAdjustClock;
+        private FramedClock framedClock;
+
+        bool auto = false;
+
         public TestCaseHitObjects()
         {
-            var swClock = new StopwatchClock(true) { Rate = 0.2f };
-            Clock = new FramedClock(swClock);
+            rateAdjustClock = new StopwatchClock(true);
+            framedClock = new FramedClock(rateAdjustClock);
+            playbackSpeed.ValueChanged += delegate { rateAdjustClock.Rate = playbackSpeed.Value; };
+        }
+
+        HitObjectType mode = HitObjectType.Slider;
+
+        BindableNumber<double> playbackSpeed = new BindableDouble(0.5) { MinValue = 0, MaxValue = 1 };
+        private Container playfieldContainer;
+        private Container approachContainer;
+
+        private void load(HitObjectType mode)
+        {
+            this.mode = mode;
+
+            switch (mode)
+            {
+                case HitObjectType.Circle:
+                    const int count = 10;
+
+                    for (int i = 0; i < count; i++)
+                    {
+                        var h = new HitCircle
+                        {
+                            StartTime = framedClock.CurrentTime + 600 + i * 80,
+                            Position = new Vector2((i - count / 2) * 14),
+                        };
+
+                        add(new DrawableHitCircle(h));
+                    }
+                    break;
+                case HitObjectType.Slider:
+                    add(new DrawableSlider(new Slider
+                    {
+                        StartTime = framedClock.CurrentTime + 600,
+                        ControlPoints = new List<Vector2>()
+                        {
+                            new Vector2(-200, 0),
+                            new Vector2(400, 0),
+                        },
+                        Length = 400,
+                        Position = new Vector2(-200, 0),
+                        Velocity = 1,
+                        TickDistance = 100,
+                    }));
+                    break;
+                case HitObjectType.Spinner:
+                    add(new DrawableSpinner(new Spinner
+                    {
+                        StartTime = framedClock.CurrentTime + 600,
+                        Length = 1000,
+                        Position = new Vector2(0, 0),
+                    }));
+                    break;
+            }
         }
 
         public override void Reset()
         {
             base.Reset();
 
-            Clock.ProcessFrame();
+            playbackSpeed.TriggerChange();
 
-            Container approachContainer = new Container { Depth = float.MinValue, };
+            AddButton(@"circles", () => load(HitObjectType.Circle));
+            AddButton(@"slider", () => load(HitObjectType.Slider));
+            AddButton(@"spinner", () => load(HitObjectType.Spinner));
 
-            Add(approachContainer);
+            AddToggle(@"auto", (state) => { auto = state; load(mode); });
 
-            const int count = 10;
-
-            for (int i = 0; i < count; i++)
+            ButtonsContainer.Add(new SpriteText { Text = "Playback Speed" });
+            ButtonsContainer.Add(new BasicSliderBar<double>
             {
-                var h = new HitCircle
+                Width = 150,
+                Height = 10,
+                SelectionColor = Color4.Orange,
+                Bindable = playbackSpeed
+            });
+
+            framedClock.ProcessFrame();
+
+            var clockAdjustContainer = new Container
+            {
+                RelativeSizeAxes = Axes.Both,
+                Clock = framedClock,
+                Children = new[]
                 {
-                    StartTime = Clock.CurrentTime + 600 + i * 80,
-                    Position = new Vector2((i - count / 2) * 14),
-                };
+                    playfieldContainer = new Container { RelativeSizeAxes = Axes.Both },
+                    approachContainer = new Container { RelativeSizeAxes = Axes.Both }
+                }
+            };
 
-                DrawableHitCircle d = new DrawableHitCircle(h)
-                {
-                    Anchor = Anchor.Centre,
-                    Depth = i,
-                    State = ArmedState.Hit,
-                    Judgement = new OsuJudgementInfo { Result = HitResult.Hit }
-                };
+            Add(clockAdjustContainer);
 
+            load(mode);
+        }
 
-                approachContainer.Add(d.ApproachCircle.CreateProxy());
-                Add(d);
+        int depth;
+        void add(DrawableHitObject h)
+        {
+            h.Anchor = Anchor.Centre;
+            h.Depth = depth++;
+
+            if (auto)
+            {
+                h.State = ArmedState.Hit;
+                h.Judgement = new OsuJudgementInfo { Result = HitResult.Hit };
             }
+
+            playfieldContainer.Add(h);
+            var proxyable = h as IDrawableHitObjectWithProxiedApproach;
+            if (proxyable != null)
+                approachContainer.Add(proxyable.ProxiedLayer.CreateProxy());
         }
     }
 }

osu.Desktop.VisualTests/Tests/TestCaseKeyCounter.cs

@@ -1,18 +1,16 @@
 // 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.GameModes.Testing;
+using osu.Framework.Screens.Testing;
 using osu.Framework.Graphics;
-using osu.Game.Graphics.UserInterface;
 using OpenTK.Input;
-using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Configuration;
 using OpenTK;
 using OpenTK.Graphics;
 using osu.Framework.MathUtils;
 using osu.Framework.Graphics.Sprites;
-using osu.Framework.Graphics.Transformations;
+using osu.Framework.Graphics.Transforms;
 using osu.Game.Screens.Play;
 
 namespace osu.Desktop.VisualTests.Tests

osu.Desktop.VisualTests/Tests/TestCaseMenuButtonSystem.cs

@@ -1,7 +1,7 @@
 // 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.GameModes.Testing;
+using osu.Framework.Screens.Testing;
 using osu.Framework.Graphics.Colour;
 using osu.Framework.Graphics.Sprites;
 using osu.Game.Screens.Menu;

osu.Desktop.VisualTests/Tests/TestCaseModSelectOverlay.cs

@@ -0,0 +1,40 @@
+// 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;
+using osu.Game.Overlays.Mods;
+using osu.Framework.Screens.Testing;
+using osu.Game.Modes;
+using osu.Game.Graphics;
+using osu.Framework.Allocation;
+using osu.Game.Overlays;
+
+namespace osu.Desktop.VisualTests.Tests
+{
+    class TestCaseModSelectOverlay : TestCase
+    {
+        public override string Name => @"Mod Select";
+
+        public override string Description => @"Tests the mod select overlay";
+
+        private ModSelectOverlay modSelect;
+
+        public override void Reset()
+        {
+            base.Reset();
+
+            Add(modSelect = new ModSelectOverlay
+            {
+                RelativeSizeAxes = Axes.X,
+                Origin = Anchor.BottomCentre,
+                Anchor = Anchor.BottomCentre,
+            });
+
+            AddButton("Toggle", modSelect.ToggleVisibility);
+            AddButton("osu!", () => modSelect.PlayMode.Value = PlayMode.Osu);
+            AddButton("osu!taiko", () => modSelect.PlayMode.Value = PlayMode.Taiko);
+            AddButton("osu!catch", () => modSelect.PlayMode.Value = PlayMode.Catch);
+            AddButton("osu!mania", () => modSelect.PlayMode.Value = PlayMode.Mania);
+        }
+    }
+}

osu.Desktop.VisualTests/Tests/TestCaseMusicController.cs

@@ -1,10 +1,11 @@
 // 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.GameModes.Testing;
+using osu.Framework.Screens.Testing;
 using osu.Framework.Graphics;
 using osu.Framework.Timing;
 using osu.Game.Overlays;
+using osu.Framework.Graphics.Containers;
 
 namespace osu.Desktop.VisualTests.Tests
 {
@@ -30,7 +31,7 @@ namespace osu.Desktop.VisualTests.Tests
                 Anchor = Anchor.Centre
             };
             Add(mc);
-            AddToggle(@"Show", mc.ToggleVisibility);
+            AddToggle(@"Show", (state) => mc.State = state ? Visibility.Visible : Visibility.Hidden);
         }
     }
 }

osu.Desktop.VisualTests/Tests/TestCaseNotificationManager.cs

@@ -3,13 +3,12 @@
 
 using System.Collections.Generic;
 using osu.Framework.Graphics;
-using osu.Framework.GameModes.Testing;
+using osu.Framework.Screens.Testing;
 using osu.Framework.MathUtils;
-using osu.Framework.Timing;
 using osu.Game.Overlays;
 using System.Linq;
 using osu.Game.Overlays.Notifications;
-using osu.Game.Screens.Backgrounds;
+using osu.Framework.Graphics.Containers;
 
 namespace osu.Desktop.VisualTests.Tests
 {
@@ -26,15 +25,13 @@ namespace osu.Desktop.VisualTests.Tests
 
             progressingNotifications.Clear();
 
-            AddInternal(new BackgroundModeDefault() { Depth = 10 });
-
             Content.Add(manager = new NotificationManager
             {
                 Anchor = Anchor.TopRight,
                 Origin = Anchor.TopRight,
             });
 
-            AddToggle(@"show", manager.ToggleVisibility);
+            AddToggle(@"show", (state) => manager.State = state ? Visibility.Visible : Visibility.Hidden);
 
             AddButton(@"simple #1", sendNotification1);
             AddButton(@"simple #2", sendNotification2);
@@ -88,13 +85,13 @@ namespace osu.Desktop.VisualTests.Tests
                 if (n.Progress < 1)
                     n.Progress += (float)(Time.Elapsed / 2000) * RNG.NextSingle();
                 else
-                    n.Complete();
+                    n.State = ProgressNotificationState.Completed;
             }
         }
 
         private void sendProgress2()
         {
-            var n = new ProgressNotification(@"Downloading Haitai...");
+            var n = new ProgressNotification { Text = @"Downloading Haitai..." };
             manager.Post(n);
             progressingNotifications.Add(n);
         }
@@ -103,19 +100,19 @@ namespace osu.Desktop.VisualTests.Tests
 
         private void sendProgress1()
         {
-            var n = new ProgressNotification(@"Uploading to BSS...");
+            var n = new ProgressNotification { Text = @"Uploading to BSS..." };
             manager.Post(n);
             progressingNotifications.Add(n);
         }
 
         private void sendNotification2()
         {
-            manager.Post(new SimpleNotification(@"You are amazing"));
+            manager.Post(new SimpleNotification { Text = @"You are amazing" });
         }
 
         private void sendNotification1()
         {
-            manager.Post(new SimpleNotification(@"Welcome to osu!. Enjoy your stay!"));
+            manager.Post(new SimpleNotification { Text = @"Welcome to osu!. Enjoy your stay!" });
         }
     }
 }

osu.Desktop.VisualTests/Tests/TestCaseOptions.cs

@@ -1,12 +1,8 @@
 // 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.GameModes.Testing;
-using osu.Framework.Graphics;
-using osu.Game.Graphics.UserInterface;
-using OpenTK.Input;
+using osu.Framework.Screens.Testing;
 using osu.Game.Overlays;
-using osu.Framework.Graphics.Containers;
 
 namespace osu.Desktop.VisualTests.Tests
 {

osu.Desktop.VisualTests/Tests/TestCasePauseOverlay.cs

@@ -1,16 +1,9 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System;
-using OpenTK.Graphics;
 using osu.Framework.Logging;
-using osu.Framework.Graphics;
-using osu.Game.Overlays.Pause;
-using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Sprites;
-using osu.Framework.Graphics.Colour;
-using osu.Framework.GameModes.Testing;
-using osu.Framework.Graphics.UserInterface;
+using osu.Framework.Screens.Testing;
+using osu.Game.Screens.Play;
 
 namespace osu.Desktop.VisualTests.Tests
 {

osu.Desktop.VisualTests/Tests/TestCasePlaySongSelect.cs

@@ -1,9 +1,11 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
+using System; 
 using System.Collections.Generic;
 using osu.Desktop.VisualTests.Platform;
-using osu.Framework.GameModes.Testing;
+using osu.Framework.Screens.Testing;
+using osu.Framework.MathUtils;
 using osu.Game.Database;
 using osu.Game.Modes;
 using osu.Game.Screens.Select;
@@ -14,6 +16,7 @@ namespace osu.Desktop.VisualTests.Tests
     {
         private BeatmapDatabase db, oldDb;
         private TestStorage storage;
+        private PlaySongSelect songSelect;
 
         public override string Name => @"Song Select";
         public override string Description => @"with fake data";
@@ -35,9 +38,15 @@ namespace osu.Desktop.VisualTests.Tests
 
                 db.Import(sets);
             }
-            Add(new PlaySongSelect());
+
+            Add(songSelect = new PlaySongSelect());
+
+            AddButton(@"Sort by Artist", delegate { songSelect.Filter.Sort = FilterControl.SortMode.Artist; });
+            AddButton(@"Sort by Title", delegate { songSelect.Filter.Sort = FilterControl.SortMode.Title; });
+            AddButton(@"Sort by Author", delegate { songSelect.Filter.Sort = FilterControl.SortMode.Author; });
+            AddButton(@"Sort by Difficulty", delegate { songSelect.Filter.Sort = FilterControl.SortMode.Difficulty; });
         }
-        
+
         protected override void Dispose(bool isDisposing)
         {
             if (oldDb != null)
@@ -59,9 +68,10 @@ namespace osu.Desktop.VisualTests.Tests
                 Metadata = new BeatmapMetadata
                 {
                     OnlineBeatmapSetID = 1234 + i,
-                    Artist = "MONACA",
-                    Title = "Black Song",
-                    Author = "Some Guy",
+                    // Create random metadata, then we can check if sorting works based on these
+                    Artist = "MONACA " + RNG.Next(0, 9),
+                    Title = "Black Song " + RNG.Next(0, 9),
+                    Author = "Some Guy " + RNG.Next(0, 9),
                 },
                 Beatmaps = new List<BeatmapInfo>(new[]
                 {

osu.Desktop.VisualTests/Tests/TestCasePlayer.cs

@@ -3,13 +3,12 @@
 
 using System.Collections.Generic;
 using osu.Framework.Allocation;
-using osu.Framework.GameModes.Testing;
-using osu.Framework.MathUtils;
-using osu.Framework.Timing;
+using osu.Framework.Screens.Testing;
 using osu.Game.Beatmaps;
 using osu.Game.Beatmaps.Formats;
 using OpenTK;
 using osu.Framework.Graphics.Sprites;
+using osu.Game.Beatmaps.IO;
 using osu.Game.Database;
 using osu.Game.Modes;
 using osu.Game.Modes.Objects;
@@ -60,25 +59,48 @@ namespace osu.Desktop.VisualTests.Tests
 
                 Beatmap b = new Beatmap
                 {
-                    HitObjects = objects
+                    HitObjects = objects,
+                    BeatmapInfo = new BeatmapInfo
+                    {
+                        Metadata = new BeatmapMetadata
+                        {
+                            Artist = @"Unknown",
+                            Title = @"Sample Beatmap",
+                            Author = @"peppy",
+                        }
+                    }
                 };
 
                 decoder.Process(b);
 
-                beatmap = new WorkingBeatmap(b);
+                beatmap = new TestWorkingBeatmap(b);
             }
 
             Add(new Box
             {
                 RelativeSizeAxes = Framework.Graphics.Axes.Both,
-                Colour = Color4.Gray,
+                Colour = Color4.Black,
             });
 
-            Add(new Player
+            Add(new PlayerLoader(new Player
             {
                 PreferredPlayMode = PlayMode.Osu,
                 Beatmap = beatmap
+            })
+            {
+                Beatmap = beatmap
             });
         }
+
+        class TestWorkingBeatmap : WorkingBeatmap
+        {
+            public TestWorkingBeatmap(Beatmap beatmap)
+                : base(beatmap.BeatmapInfo, beatmap.BeatmapInfo.BeatmapSet)
+            {
+                Beatmap = beatmap;
+            }
+
+            protected override ArchiveReader GetReader() => null;
+        }
     }
 }

osu.Desktop.VisualTests/Tests/TestCaseScoreCounter.cs

@@ -2,22 +2,16 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System;
-using osu.Framework.GameModes.Testing;
+using osu.Framework.Screens.Testing;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.MathUtils;
 using osu.Game.Graphics.UserInterface;
-using osu.Game.Modes;
-using osu.Game.Modes.Catch;
 using osu.Game.Modes.Catch.UI;
-using osu.Game.Modes.Mania;
 using osu.Game.Modes.Mania.UI;
-using osu.Game.Modes.Osu;
 using osu.Game.Modes.Osu.UI;
-using osu.Game.Modes.Taiko;
 using osu.Game.Modes.Taiko.UI;
 using osu.Game.Modes.UI;
-using osu.Game.Screens.Play;
 using OpenTK;
 using OpenTK.Graphics;
 using osu.Framework.Graphics.Primitives;
@@ -164,7 +158,7 @@ namespace osu.Desktop.VisualTests.Tests
 
             AddButton(@"Alter stars", delegate
             {
-                stars.Count = RNG.NextSingle() * (stars.MaxStars + 1);
+                stars.Count = RNG.NextSingle() * (stars.StarCount + 1);
                 starsLabel.Text = stars.Count.ToString("0.00");
             });
 

osu.Desktop.VisualTests/Tests/TestCaseTextAwesome.cs

@@ -2,7 +2,7 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System;
-using osu.Framework.GameModes.Testing;
+using osu.Framework.Screens.Testing;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.MathUtils;
@@ -22,9 +22,9 @@ namespace osu.Desktop.VisualTests.Tests
         {
             base.Reset();
 
-            FlowContainer flow;
+            FillFlowContainer flow;
 
-            Add(flow = new FlowContainer()
+            Add(flow = new FillFlowContainer()
             {
                 RelativeSizeAxes = Axes.Both,
                 Size = new Vector2(0.5f),

osu.Desktop.VisualTests/Tests/TestCaseTwoLayerButton.cs

@@ -1,13 +1,9 @@
 // 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.GameModes.Testing;
-using osu.Framework.Graphics.Colour;
-using osu.Framework.Graphics.Sprites;
+using osu.Framework.Screens.Testing;
 using osu.Game.Graphics.UserInterface;
-using osu.Game.Screens.Menu;
 using osu.Game.Screens.Play;
-using OpenTK.Graphics;
 
 namespace osu.Desktop.VisualTests.Tests
 {

osu.Desktop.VisualTests/VisualTestGame.cs

@@ -1,16 +1,9 @@
 // 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;
-using osu.Framework.GameModes.Testing;
-using osu.Framework.Graphics.Cursor;
-using osu.Game.Database;
+using osu.Framework.Screens.Testing;
 using osu.Game;
-using osu.Framework.Desktop.Platform;
-using System.Reflection;
-using System.IO;
-using System.Collections.Generic;
-using osu.Framework.Allocation;
+using osu.Game.Screens.Backgrounds;
 
 namespace osu.Desktop.VisualTests
 {
@@ -20,6 +13,8 @@ namespace osu.Desktop.VisualTests
         {
             base.LoadComplete();
 
+            (new BackgroundScreenDefault() { Depth = 10 }).LoadAsync(this, AddInternal);
+
             // Have to construct this here, rather than in the constructor, because
             // we depend on some dependencies to be loaded within OsuGameBase.load().
             Add(new TestBrowser());

osu.Desktop.VisualTests/app.config

@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
-
 <configuration>
   <runtime>
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

osu.Desktop.VisualTests/osu.Desktop.VisualTests.csproj

@@ -82,6 +82,10 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="mscorlib" />
+    <Reference Include="OpenTK, Version=2.0.0.0, Culture=neutral, PublicKeyToken=bad199fe84eb3df4, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\ppy.OpenTK.2.0.50727.1340\lib\net45\OpenTK.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="SQLite.Net, Version=3.1.0.0, Culture=neutral, processorArchitecture=MSIL">
       <SpecificVersion>False</SpecificVersion>
       <HintPath>$(SolutionDir)\packages\SQLite.Net.Core-PCL.3.1.1\lib\portable-win8+net45+wp8+wpa81+MonoAndroid1+MonoTouch1\SQLite.Net.dll</HintPath>
@@ -99,9 +103,8 @@
     <Reference Include="SQLite.Net.Platform.Generic">
       <HintPath>$(SolutionDir)\packages\SQLite.Net-PCL.3.1.1\lib\net40\SQLite.Net.Platform.Generic.dll</HintPath>
     </Reference>
-    <Reference Include="OpenTK">
-      <HintPath>$(SolutionDir)\packages\ppy.OpenTK.2.0.50727.1339\lib\net45\OpenTK.dll</HintPath>
-    </Reference>
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
     <None Include="..\osu.licenseheader">
@@ -176,6 +179,7 @@
     <Compile Include="Benchmark.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Tests\TestCaseChatDisplay.cs" />
+    <Compile Include="Tests\TestCaseDrawings.cs" />
     <Compile Include="Tests\TestCaseGamefield.cs" />
     <Compile Include="Tests\TestCaseMusicController.cs" />
     <Compile Include="Tests\TestCaseNotificationManager.cs" />
@@ -191,6 +195,9 @@
     <Compile Include="Platform\TestStorage.cs" />
     <Compile Include="Tests\TestCaseOptions.cs" />
     <Compile Include="Tests\TestCasePauseOverlay.cs" />
+    <Compile Include="Tests\TestCaseModSelectOverlay.cs" />
+    <Compile Include="Tests\TestCaseDialogOverlay.cs" />
+    <Compile Include="Tests\TestCaseBeatmapOptionsOverlay.cs" />
   </ItemGroup>
   <ItemGroup />
   <ItemGroup />

osu.Desktop.VisualTests/packages.config

@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
 <packages>
   <package id="Newtonsoft.Json" version="9.0.1" targetFramework="net45" />
-  <package id="ppy.OpenTK" version="2.0.50727.1339" targetFramework="net45" />
+  <package id="ppy.OpenTK" version="2.0.50727.1340" targetFramework="net45" />
   <package id="SQLite.Net.Core-PCL" version="3.1.1" targetFramework="net45" />
   <package id="SQLite.Net-PCL" version="3.1.1" targetFramework="net45" />
   <package id="SQLiteNetExtensions" version="1.3.0" targetFramework="net45" />

osu.Desktop/Beatmaps/IO/LegacyFilesystemReader.cs

@@ -1,9 +1,7 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System;
 using System.IO;
-using System.Collections.Generic;
 using System.Linq;
 using osu.Game.Beatmaps.Formats;
 using osu.Game.Beatmaps.IO;
@@ -20,27 +18,22 @@ namespace osu.Desktop.Beatmaps.IO
         public static void Register() => AddReader<LegacyFilesystemReader>((storage, path) => Directory.Exists(path));
 
         private string basePath { get; set; }
-        private string[] beatmaps { get; set; }
         private Beatmap firstMap { get; set; }
 
         public LegacyFilesystemReader(string path)
         {
             basePath = path;
-            beatmaps = Directory.GetFiles(basePath, @"*.osu").Select(f => Path.GetFileName(f)).ToArray();
-            if (beatmaps.Length == 0)
+            BeatmapFilenames = Directory.GetFiles(basePath, @"*.osu").Select(f => Path.GetFileName(f)).ToArray();
+            if (BeatmapFilenames.Length == 0)
                 throw new FileNotFoundException(@"This directory contains no beatmaps");
-            using (var stream = new StreamReader(GetStream(beatmaps[0])))
+            StoryboardFilename = Directory.GetFiles(basePath, @"*.osb").Select(f => Path.GetFileName(f)).FirstOrDefault();
+            using (var stream = new StreamReader(GetStream(BeatmapFilenames[0])))
             {
                 var decoder = BeatmapDecoder.GetDecoder(stream);
                 firstMap = decoder.Decode(stream);
             }
         }
 
-        public override string[] ReadBeatmaps()
-        {
-            return beatmaps;
-        }
-
         public override Stream GetStream(string name)
         {
             return File.OpenRead(Path.Combine(basePath, name));

osu.Desktop/OsuGameDesktop.cs

@@ -2,32 +2,50 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Game;
-using System;
-using System.Collections.Generic;
 using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using System.Windows.Forms;
 using osu.Framework.Platform;
 using osu.Framework.Desktop.Platform;
-using osu.Game.Database;
+using osu.Desktop.Overlays;
+using System.Reflection;
+using System.Drawing;
+using osu.Game.Screens.Menu;
 
 namespace osu.Desktop
 {
     class OsuGameDesktop : OsuGame
     {
+        private VersionManager versionManager;
+
+        public override bool IsDeployedBuild => versionManager.IsDeployedBuild;
+
         public OsuGameDesktop(string[] args = null)
             : base(args)
         {
-
+            versionManager = new VersionManager { Depth = int.MinValue };
         }
 
-        public override void SetHost(BasicGameHost host)
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            versionManager.LoadAsync(this);
+            ModeChanged += m =>
+            {
+                if (!versionManager.IsAlive && m is Intro)
+                    Add(versionManager);
+            };
+        }
+
+        public override void SetHost(GameHost host)
         {
             base.SetHost(host);
             var desktopWindow = host.Window as DesktopGameWindow;
             if (desktopWindow != null)
             {
+                desktopWindow.Icon = Icon.ExtractAssociatedIcon(Assembly.GetExecutingAssembly().Location);
+                desktopWindow.Title = @"osu!lazer";
+
                 desktopWindow.DragEnter += dragEnter;
                 desktopWindow.DragDrop += dragDrop;
             }
@@ -38,7 +56,7 @@ namespace osu.Desktop
             // this method will only be executed if e.Effect in dragEnter gets set to something other that None.
             var dropData = e.Data.GetData(DataFormats.FileDrop) as object[];
             var filePaths = dropData.Select(f => f.ToString()).ToArray();
-            ImportBeatmaps(filePaths);
+            ImportBeatmapsAsync(filePaths);
         }
 
         private void dragEnter(DragEventArgs e)

osu.Desktop/Overlays/VersionManager.cs

@@ -0,0 +1,238 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Diagnostics;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Colour;
+using osu.Framework.Graphics.Containers;
+using osu.Game.Graphics.Sprites;
+using osu.Game.Overlays;
+using osu.Game.Overlays.Notifications;
+using Squirrel;
+using System.Reflection;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Textures;
+using osu.Game.Graphics;
+using OpenTK;
+using OpenTK.Graphics;
+using System.Net.Http;
+using osu.Framework.Logging;
+
+namespace osu.Desktop.Overlays
+{
+    public class VersionManager : OverlayContainer
+    {
+        private UpdateManager updateManager;
+        private NotificationManager notificationManager;
+
+        AssemblyName assembly = Assembly.GetEntryAssembly().GetName();
+
+        public bool IsDeployedBuild => assembly.Version.Major > 0;
+
+        protected override bool HideOnEscape => false;
+
+        public override bool HandleInput => false;
+
+        [BackgroundDependencyLoader]
+        private void load(NotificationManager notification, OsuColour colours, TextureStore textures)
+        {
+            notificationManager = notification;
+
+            AutoSizeAxes = Axes.Both;
+            Anchor = Anchor.BottomCentre;
+            Origin = Anchor.BottomCentre;
+            Alpha = 0;
+
+            bool isDebug = false;
+            Debug.Assert(isDebug = true);
+
+            string version;
+            if (!IsDeployedBuild)
+            {
+                version = @"local " + (isDebug ? @"debug" : @"release");
+            }
+            else
+                version = $@"{assembly.Version.Major}.{assembly.Version.Minor}.{assembly.Version.Build}";
+
+            Children = new Drawable[]
+            {
+                new FillFlowContainer
+                {
+                    AutoSizeAxes = Axes.Both,
+                    Direction = FillDirection.Down,
+                    Children = new Drawable[]
+                    {
+                        new FillFlowContainer
+                        {
+                            AutoSizeAxes = Axes.Both,
+                            Direction = FillDirection.Right,
+                            Spacing = new Vector2(5),
+                            Anchor = Anchor.TopCentre,
+                            Origin = Anchor.TopCentre,
+                            Children = new Drawable[]
+                            {
+                                new OsuSpriteText
+                                {
+                                    Font = @"Exo2.0-Bold",
+                                    Text = $@"osu!lazer"
+                                },
+                                new OsuSpriteText
+                                {
+                                    Colour = isDebug ? colours.Red : Color4.White,
+                                    Text = version
+                                },
+                            }
+                        },
+                        new OsuSpriteText
+                        {
+                            Anchor = Anchor.TopCentre,
+                            Origin = Anchor.TopCentre,
+                            TextSize = 12,
+                            Colour = colours.Yellow,
+                            Font = @"Venera",
+                            Text = $@"Development Build"
+                        },
+                        new Sprite
+                        {
+                            Anchor = Anchor.TopCentre,
+                            Origin = Anchor.TopCentre,
+                            Texture = textures.Get(@"Menu/dev-build-footer"),
+                        },
+                    }
+                }
+            };
+
+            if (IsDeployedBuild)
+                checkForUpdateAsync();
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+            State = Visibility.Visible;
+        }
+
+        protected override void Dispose(bool isDisposing)
+        {
+            base.Dispose(isDisposing);
+            updateManager?.Dispose();
+        }
+
+        private async void checkForUpdateAsync(bool useDeltaPatching = true, UpdateProgressNotification notification = null)
+        {
+            //should we schedule a retry on completion of this check?
+            bool scheduleRetry = true;
+
+            try
+            {
+                if (updateManager == null) updateManager = await UpdateManager.GitHubUpdateManager(@"https://github.com/ppy/osu", @"osulazer", null, null, true);
+
+                var info = await updateManager.CheckForUpdate(!useDeltaPatching);
+                if (info.ReleasesToApply.Count == 0)
+                    //no updates available. bail and retry later.
+                    return;
+
+                if (notification == null)
+                {
+                    notification = new UpdateProgressNotification { State = ProgressNotificationState.Active };
+                    Schedule(() => notificationManager.Post(notification));
+                }
+
+                Schedule(() =>
+                {
+                    notification.Progress = 0;
+                    notification.Text = @"Downloading update...";
+                });
+
+                try
+                {
+                    await updateManager.DownloadReleases(info.ReleasesToApply, p => Schedule(() => notification.Progress = p / 100f));
+
+                    Schedule(() =>
+                    {
+                        notification.Progress = 0;
+                        notification.Text = @"Installing update...";
+                    });
+
+                    await updateManager.ApplyReleases(info, p => Schedule(() => notification.Progress = p / 100f));
+
+                    Schedule(() => notification.State = ProgressNotificationState.Completed);
+                }
+                catch (Exception e)
+                {
+                    if (useDeltaPatching)
+                    {
+                        Logger.Error(e, @"delta patching failed!");
+
+                        //could fail if deltas are unavailable for full update path (https://github.com/Squirrel/Squirrel.Windows/issues/959)
+                        //try again without deltas.
+                        checkForUpdateAsync(false, notification);
+                        scheduleRetry = false;
+                    }
+                    else
+                    {
+                        Logger.Error(e, @"update failed!");
+                    }
+                }
+            }
+            catch (HttpRequestException)
+            {
+                //likely have no internet connection.
+                //we'll ignore this and retry later.
+            }
+            finally
+            {
+                if (scheduleRetry)
+                {
+                    //check again in 30 minutes.
+                    Scheduler.AddDelayed(() => checkForUpdateAsync(), 60000 * 30);
+                    if (notification != null)
+                        notification.State = ProgressNotificationState.Cancelled;
+                }
+            }
+        }
+
+        protected override void PopIn()
+        {
+            FadeIn(1000);
+        }
+
+        protected override void PopOut()
+        {
+        }
+
+        class UpdateProgressNotification : ProgressNotification
+        {
+            protected override Notification CreateCompletionNotification() => new ProgressCompletionNotification(this)
+            {
+                Text = @"Update ready to install. Click to restart!",
+                Activated = () =>
+                {
+                    UpdateManager.RestartApp();
+                    return true;
+                }
+            };
+
+            [BackgroundDependencyLoader]
+            private void load(OsuColour colours)
+            {
+                IconContent.Add(new Drawable[]
+                {
+                    new Box
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        ColourInfo = ColourInfo.GradientVertical(colours.YellowDark, colours.Yellow)
+                    },
+                    new TextAwesome
+                    {
+                        Anchor = Anchor.Centre,
+                        Icon = FontAwesome.fa_upload,
+                        Colour = Color4.White,
+                    }
+                });
+            }
+        }
+    }
+}

osu.Desktop/Program.cs

@@ -3,14 +3,9 @@
 
 using System;
 using System.IO;
-using System.Linq;
-using System.Threading;
 using osu.Desktop.Beatmaps.IO;
-using osu.Framework;
 using osu.Framework.Desktop;
 using osu.Framework.Desktop.Platform;
-using osu.Framework.Platform;
-using osu.Game;
 using osu.Game.IPC;
 using osu.Game.Modes;
 using osu.Game.Modes.Catch;
@@ -40,7 +35,7 @@ namespace osu.Desktop
                     foreach (var file in args)
                     {
                         Console.WriteLine(@"Importing {0}", file);
-                        if (!importer.Import(Path.GetFullPath(file)).Wait(3000))
+                        if (!importer.ImportAsync(Path.GetFullPath(file)).Wait(3000))
                             throw new TimeoutException(@"IPC took too long to send");
                     }
                 }
@@ -51,9 +46,7 @@ namespace osu.Desktop
                     Ruleset.Register(new ManiaRuleset());
                     Ruleset.Register(new CatchRuleset());
 
-                    BaseGame osu = new OsuGameDesktop(args);
-                    host.Add(osu);
-                    host.Run();
+                    host.Run(new OsuGameDesktop(args));
                 }
                 return 0;
             }

osu.Desktop/Properties/AssemblyInfo.cs

@@ -0,0 +1,28 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System.Reflection;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("osu!lazer")]
+[assembly: AssemblyDescription("click the circles. to the beat.")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("ppy Pty Ltd")]
+[assembly: AssemblyProduct("osu!lazer")]
+[assembly: AssemblyCopyright("ppy Pty Ltd 2007-2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("55e28cb2-7b6c-4595-8dcc-9871d8aad7e9")]
+
+[assembly: AssemblyVersion("0.0.0")]
+[assembly: AssemblyFileVersion("0.0.0")]

osu.Desktop/app.config

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+-->
+<configuration>
+  <runtime>
+    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
+      <dependentAssembly>
+        <assemblyIdentity name="Newtonsoft.Json" publicKeyToken="30ad4fe6b2a6aeed" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-9.0.0.0" newVersion="9.0.0.0" />
+      </dependentAssembly>
+      <dependentAssembly>
+        <assemblyIdentity name="DeltaCompressionDotNet.MsDelta" publicKeyToken="46b2138a390abf55" culture="neutral" />
+        <bindingRedirect oldVersion="0.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
+      </dependentAssembly>
+    </assemblyBinding>
+  </runtime>
+</configuration>

osu.Desktop/osu.Desktop.csproj

@@ -79,19 +79,83 @@
     <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
   </PropertyGroup>
   <PropertyGroup>
-    <Win32Resource>osu!.res</Win32Resource>
+    <Win32Resource>
+    </Win32Resource>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ApplicationIcon>lazer.ico</ApplicationIcon>
+  </PropertyGroup>
+  <PropertyGroup>
+    <ApplicationManifest>Properties\app.manifest</ApplicationManifest>
   </PropertyGroup>
   <ItemGroup>
+    <Reference Include="DeltaCompressionDotNet, Version=1.1.0.0, Culture=neutral, PublicKeyToken=1d14d6e5194e7f4a, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\DeltaCompressionDotNet.1.1.0\lib\net20\DeltaCompressionDotNet.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="DeltaCompressionDotNet.MsDelta, Version=1.1.0.0, Culture=neutral, PublicKeyToken=46b2138a390abf55, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\DeltaCompressionDotNet.1.1.0\lib\net20\DeltaCompressionDotNet.MsDelta.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="DeltaCompressionDotNet.PatchApi, Version=1.1.0.0, Culture=neutral, PublicKeyToken=3e8888ee913ed789, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\DeltaCompressionDotNet.1.1.0\lib\net20\DeltaCompressionDotNet.PatchApi.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="ICSharpCode.SharpZipLib, Version=0.86.0.518, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\squirrel.windows.1.5.2\lib\Net45\ICSharpCode.SharpZipLib.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Mono.Cecil, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.9.6.4\lib\net45\Mono.Cecil.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Mono.Cecil.Mdb, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.9.6.4\lib\net45\Mono.Cecil.Mdb.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Mono.Cecil.Pdb, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.9.6.4\lib\net45\Mono.Cecil.Pdb.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Mono.Cecil.Rocks, Version=0.9.6.0, Culture=neutral, PublicKeyToken=0738eb9f132ed756, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Mono.Cecil.0.9.6.4\lib\net45\Mono.Cecil.Rocks.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="mscorlib" />
+    <Reference Include="NuGet.Squirrel, Version=3.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\squirrel.windows.1.5.2\lib\Net45\NuGet.Squirrel.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="OpenTK, Version=2.0.0.0, Culture=neutral, PublicKeyToken=bad199fe84eb3df4" />
+    <Reference Include="Splat, Version=2.0.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Splat.2.0.0\lib\Net45\Splat.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="Squirrel, Version=1.5.2.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\squirrel.windows.1.5.2\lib\Net45\Squirrel.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
     <Reference Include="System" />
+    <Reference Include="System.Drawing" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Net.Http.Extensions, Version=2.2.29.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Microsoft.Net.Http.2.2.29\lib\net45\System.Net.Http.Extensions.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Net.Http.Primitives, Version=4.2.29.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL">
+      <HintPath>$(SolutionDir)\packages\Microsoft.Net.Http.2.2.29\lib\net45\System.Net.Http.Primitives.dll</HintPath>
+      <Private>True</Private>
+    </Reference>
+    <Reference Include="System.Net.Http.WebRequest" />
     <Reference Include="System.Windows.Forms" />
   </ItemGroup>
   <ItemGroup>
     <None Include="..\osu.licenseheader">
       <Link>osu.licenseheader</Link>
     </None>
+    <None Include="app.config" />
     <None Include="osu!.res" />
+    <None Include="packages.config" />
     <None Include="Properties\app.manifest" />
   </ItemGroup>
   <ItemGroup>
@@ -157,11 +221,14 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="OsuGameDesktop.cs" />
+    <Compile Include="Overlays\VersionManager.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Beatmaps\IO\LegacyFilesystemReader.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <Content Include="lazer.ico" />
   </ItemGroup>
-  <ItemGroup />
-  <ItemGroup />
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <!-- To modify your build process, add your task inside one of the targets below and uncomment it.
        Other similar extension points exist, see Microsoft.Common.targets.

osu.Desktop/osu.nuspec

@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
+    <metadata>
+        <id>osulazer</id>
+        <version>0.0.0</version>
+        <title>osulazer</title>
+        <authors>ppy Pty Ltd</authors>
+        <owners>Dean Herbert</owners>
+        <projectUrl>https://osu.ppy.sh/</projectUrl>
+        <iconUrl>https://puu.sh/tYyXZ/9a01a5d1b0.ico</iconUrl>
+        <requireLicenseAcceptance>false</requireLicenseAcceptance>
+        <description>click the circles. to the beat.</description>
+        <summary>click the circles.</summary>
+        <releaseNotes>testing</releaseNotes>
+        <copyright>Copyright ppy Pty Ltd 2007-2017</copyright>
+        <language>en-AU</language>
+    </metadata>
+    <files>
+      <file src="*.exe" target="lib\net45\" exclude="**vshost**"/>
+      <file src="*.dll" target="lib\net45\"/>
+      <file src="x86\*.dll" target="lib\net45\x86\"/>
+      <file src="x64\*.dll" target="lib\net45\x64\"/>
+    </files>
+</package>
+

osu.Desktop/packages.config

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+-->
+<packages>
+  <package id="DeltaCompressionDotNet" version="1.1.0" targetFramework="net45" />
+  <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net45" />
+  <package id="Mono.Cecil" version="0.9.6.4" targetFramework="net45" />
+  <package id="Splat" version="2.0.0" targetFramework="net45" />
+  <package id="squirrel.windows" version="1.5.2" targetFramework="net45" />
+</packages>

osu.Game.Modes.Catch/CatchDifficultyCalculator.cs

@@ -0,0 +1,27 @@
+// 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.Game.Beatmaps;
+using osu.Game.Modes.Catch.Objects;
+using osu.Game.Modes.Objects;
+using System;
+using System.Collections.Generic;
+
+namespace osu.Game.Modes.Catch
+{
+    public class CatchDifficultyCalculator : DifficultyCalculator<CatchBaseHit>
+    {
+        protected override PlayMode PlayMode => PlayMode.Catch;
+
+        public CatchDifficultyCalculator(Beatmap beatmap) : base(beatmap)
+        {
+        }
+
+        protected override HitObjectConverter<CatchBaseHit> Converter => new CatchConverter();
+
+        protected override double CalculateInternal(Dictionary<String, String> categoryDifficulty)
+        {
+            return 0;
+        }
+    }
+}

osu.Game.Modes.Catch/CatchMod.cs

@@ -0,0 +1,64 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+namespace osu.Game.Modes.Catch
+{
+    public class CatchModNoFail : ModNoFail
+    {
+
+    }
+
+    public class CatchModEasy : ModEasy
+    {
+
+    }
+
+    public class CatchModHidden : ModHidden
+    {
+        public override string Description => @"Play with no approach circles and fading notes for a slight score advantage.";
+        public override double ScoreMultiplier => 1.06;
+        public override Mods[] DisablesMods => new Mods[] { };
+    }
+
+    public class CatchModHardRock : ModHardRock
+    {
+        public override double ScoreMultiplier => 1.12;
+        public override bool Ranked => true;
+    }
+
+    public class CatchModSuddenDeath : ModSuddenDeath
+    {
+
+    }
+
+    public class CatchModDoubleTime : ModDoubleTime
+    {
+        public override double ScoreMultiplier => 1.06;
+    }
+
+    public class CatchModRelax : ModRelax
+    {
+        public override string Description => @"Use the mouse to control the catcher.";
+    }
+
+    public class CatchModHalfTime : ModHalfTime
+    {
+        public override double ScoreMultiplier => 0.5;
+    }
+
+    public class CatchModNightcore : ModNightcore
+    {
+        public override double ScoreMultiplier => 1.06;
+    }
+
+    public class CatchModFlashlight : ModFlashlight
+    {
+        public override double ScoreMultiplier => 1.12;
+        public override Mods[] DisablesMods => new Mods[] { };
+    }
+
+    public class CatchModPerfect : ModPerfect
+    {
+
+    }
+}

osu.Game.Modes.Catch/CatchRuleset.cs

@@ -5,7 +5,6 @@ using System.Collections.Generic;
 using osu.Game.Graphics;
 using osu.Game.Modes.Catch.UI;
 using osu.Game.Modes.Objects;
-using osu.Game.Modes.Osu.Objects;
 using osu.Game.Modes.Osu.UI;
 using osu.Game.Modes.UI;
 using osu.Game.Beatmaps;
@@ -18,12 +17,69 @@ namespace osu.Game.Modes.Catch
 
         public override HitRenderer CreateHitRendererWith(Beatmap beatmap) => new CatchHitRenderer { Beatmap = beatmap };
 
+        public override IEnumerable<Mod> GetModsFor(ModType type)
+        {
+            switch (type)
+            {
+                case ModType.DifficultyReduction:
+                    return new Mod[]
+                    {
+                        new CatchModEasy(),
+                        new CatchModNoFail(),
+                        new CatchModHalfTime(),
+                    };
+
+                case ModType.DifficultyIncrease:
+                    return new Mod[]
+                    {
+                        new CatchModHardRock(),
+                        new MultiMod
+                        {
+                            Mods = new Mod[]
+                            {
+                                new CatchModSuddenDeath(),
+                                new CatchModPerfect(),
+                            },
+                        },
+                        new MultiMod
+                        {
+                            Mods = new Mod[]
+                            {
+                                new CatchModDoubleTime(),
+                                new CatchModNightcore(),
+                            },
+                        },
+                        new CatchModHidden(),
+                        new CatchModFlashlight(),
+                    };
+
+                case ModType.Special:
+                    return new Mod[]
+                    {
+                        new CatchModRelax(),
+                        new MultiMod
+                        {
+                            Mods = new Mod[]
+                            {
+                                new ModAutoplay(),
+                                new ModCinema(),
+                            },
+                        },
+                    };
+
+                default:
+                    return new Mod[] { };
+            }
+        }
+
         protected override PlayMode PlayMode => PlayMode.Catch;
 
         public override FontAwesome Icon => FontAwesome.fa_osu_fruits_o;
 
         public override ScoreProcessor CreateScoreProcessor(int hitObjectCount) => null;
 
-        public override HitObjectParser CreateHitObjectParser() => new OsuHitObjectParser();
+        public override HitObjectParser CreateHitObjectParser() => new NullHitObjectParser();
+
+        public override DifficultyCalculator CreateDifficultyCalculator(Beatmap beatmap) => new CatchDifficultyCalculator(beatmap);
     }
 }

osu.Game.Modes.Catch/Objects/Drawable/DrawableFruit.cs

@@ -5,7 +5,7 @@ using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
-using osu.Framework.Graphics.Transformations;
+using osu.Framework.Graphics.Transforms;
 using OpenTK;
 
 namespace osu.Game.Modes.Catch.Objects.Drawable

osu.Game.Modes.Catch/OpenTK.dll.config

@@ -1,8 +1,7 @@
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
-
 <configuration>
   <dllmap os="linux" dll="opengl32.dll" target="libGL.so.1"/>
   <dllmap os="linux" dll="glu32.dll" target="libGLU.so.1"/>

osu.Game.Modes.Catch/Properties/AssemblyInfo.cs

@@ -2,7 +2,6 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following 

osu.Game.Modes.Catch/osu.Game.Modes.Catch.csproj

@@ -33,7 +33,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="OpenTK, Version=2.0.0.0, Culture=neutral, PublicKeyToken=bad199fe84eb3df4, processorArchitecture=MSIL">
-      <HintPath>..\packages\ppy.OpenTK.2.0.50727.1339\lib\net45\OpenTK.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\ppy.OpenTK.2.0.50727.1340\lib\net45\OpenTK.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />
@@ -47,6 +47,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="CatchDifficultyCalculator.cs" />
     <Compile Include="Objects\CatchBaseHit.cs" />
     <Compile Include="Objects\CatchConverter.cs" />
     <Compile Include="Objects\Drawable\DrawableFruit.cs" />
@@ -57,6 +58,7 @@
     <Compile Include="UI\CatchHitRenderer.cs" />
     <Compile Include="UI\CatchPlayfield.cs" />
     <Compile Include="CatchRuleset.cs" />
+    <Compile Include="CatchMod.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="..\osu.licenseheader">

osu.Game.Modes.Catch/packages.config

@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
-
 <packages>
-  <package id="ppy.OpenTK" version="2.0.50727.1339" targetFramework="net45" />
+  <package id="ppy.OpenTK" version="2.0.50727.1340" targetFramework="net45" />
 </packages>

osu.Game.Modes.Mania/ManiaDifficultyCalculator.cs

@@ -0,0 +1,30 @@
+// 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.Game.Beatmaps;
+using osu.Game.Modes.Mania.Objects;
+using osu.Game.Modes.Objects;
+using System;
+using System.Collections.Generic;
+
+namespace osu.Game.Modes.Mania
+{
+    public class ManiaDifficultyCalculator : DifficultyCalculator<ManiaBaseHit>
+    {
+        protected override PlayMode PlayMode => PlayMode.Mania;
+
+        private int columns;
+
+        public ManiaDifficultyCalculator(Beatmap beatmap, int columns = 5) : base(beatmap)
+        {
+            this.columns = columns;
+        }
+
+        protected override HitObjectConverter<ManiaBaseHit> Converter => new ManiaConverter(columns);
+
+        protected override double CalculateInternal(Dictionary<String, String> categoryDifficulty)
+        {
+            return 0;
+        }
+    }
+}

osu.Game.Modes.Mania/ManiaMod.cs

@@ -0,0 +1,155 @@
+// 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.Game.Graphics;
+
+namespace osu.Game.Modes.Mania
+{
+    public class ManiaModNoFail : ModNoFail
+    {
+
+    }
+
+    public class ManiaModEasy : ModEasy
+    {
+
+    }
+
+    public class ManiaModHidden : ModHidden
+    {
+        public override string Description => @"The notes fade out before you hit them!";
+        public override double ScoreMultiplier => 1.0;
+        public override Mods[] DisablesMods => new Mods[] { Mods.Flashlight };
+    }
+
+    public class ManiaModHardRock : ModHardRock
+    {
+        public override double ScoreMultiplier => 1.0;
+        public override bool Ranked => false;
+    }
+
+    public class ManiaModSuddenDeath : ModSuddenDeath
+    {
+
+    }
+
+    public class ManiaModDoubleTime : ModDoubleTime
+    {
+        public override double ScoreMultiplier => 1.0;
+    }
+
+    public class ManiaModHalfTime : ModHalfTime
+    {
+        public override double ScoreMultiplier => 0.3;
+    }
+
+    public class ManiaModNightcore : ModNightcore
+    {
+        public override double ScoreMultiplier => 1.0;
+    }
+
+    public class ManiaModFlashlight : ModFlashlight
+    {
+        public override double ScoreMultiplier => 1.0;
+        public override Mods[] DisablesMods => new Mods[] { Mods.Hidden };
+    }
+
+    public class ManiaModPerfect : ModPerfect
+    {
+
+    }
+
+    public class ManiaModFadeIn : Mod
+    {
+        public override Mods Name => Mods.FadeIn;
+        public override FontAwesome Icon => FontAwesome.fa_osu_mod_hidden;
+        public override string Description => @"";
+        public override double ScoreMultiplier => 1;
+        public override bool Ranked => true;
+        public override Mods[] DisablesMods => new Mods[] { Mods.Flashlight };
+    }
+
+    public class ManiaModRandom : Mod
+    {
+        public override Mods Name => Mods.Random;
+        public override FontAwesome Icon => FontAwesome.fa_close;
+        public override string Description => @"Shuffle around the notes!";
+        public override double ScoreMultiplier => 1;
+        public override bool Ranked => false;
+        public override Mods[] DisablesMods => new Mods[] { };
+    }
+
+    public abstract class ManiaKeyMod : Mod
+    {
+        public abstract int KeyCount { get; }
+        public override FontAwesome Icon => FontAwesome.fa_close; // TODO: Add proper key icons
+        public override string Description => @"";
+        public override double ScoreMultiplier => 1; // TODO: Implement the mania key mod score multiplier
+        public override bool Ranked => true;
+        public override Mods[] DisablesMods => new Mods[] { };
+    }
+
+    public class ManiaModKey1 : ManiaKeyMod
+    {
+        public override int KeyCount => 1;
+        public override Mods Name => Mods.Key1;
+    }
+
+    public class ManiaModKey2 : ManiaKeyMod
+    {
+        public override int KeyCount => 2;
+        public override Mods Name => Mods.Key2;
+    }
+
+    public class ManiaModKey3 : ManiaKeyMod
+    {
+        public override int KeyCount => 3;
+        public override Mods Name => Mods.Key3;
+    }
+
+    public class ManiaModKey4 : ManiaKeyMod
+    {
+        public override int KeyCount => 4;
+        public override Mods Name => Mods.Key4;
+    }
+
+    public class ManiaModKey5 : ManiaKeyMod
+    {
+        public override int KeyCount => 5;
+        public override Mods Name => Mods.Key5;
+    }
+
+    public class ManiaModKey6 : ManiaKeyMod
+    {
+        public override int KeyCount => 6;
+        public override Mods Name => Mods.Key6;
+    }
+
+    public class ManiaModKey7 : ManiaKeyMod
+    {
+        public override int KeyCount => 7;
+        public override Mods Name => Mods.Key7;
+    }
+
+    public class ManiaModKey8 : ManiaKeyMod
+    {
+        public override int KeyCount => 8;
+        public override Mods Name => Mods.Key8;
+    }
+
+    public class ManiaModKey9 : ManiaKeyMod
+    {
+        public override int KeyCount => 9;
+        public override Mods Name => Mods.Key9;
+    }
+
+    public class ManiaModKeyCoop : Mod
+    {
+        public override Mods Name => Mods.KeyCoop;
+        public override FontAwesome Icon => FontAwesome.fa_close;
+        public override string Description => @"Double the key amount, double the fun!";
+        public override double ScoreMultiplier => 1;
+        public override bool Ranked => true;
+        public override Mods[] DisablesMods => new Mods[] { };
+    }
+}

osu.Game.Modes.Mania/ManiaRuleset.cs

@@ -5,8 +5,6 @@ using System.Collections.Generic;
 using osu.Game.Graphics;
 using osu.Game.Modes.Mania.UI;
 using osu.Game.Modes.Objects;
-using osu.Game.Modes.Osu;
-using osu.Game.Modes.Osu.Objects;
 using osu.Game.Modes.Osu.UI;
 using osu.Game.Modes.UI;
 using osu.Game.Beatmaps;
@@ -19,12 +17,85 @@ namespace osu.Game.Modes.Mania
 
         public override HitRenderer CreateHitRendererWith(Beatmap beatmap) => new ManiaHitRenderer { Beatmap = beatmap };
 
+        public override IEnumerable<Mod> GetModsFor(ModType type)
+        {
+            switch (type)
+            {
+                case ModType.DifficultyReduction:
+                    return new Mod[]
+                    {
+                        new ManiaModEasy(),
+                        new ManiaModNoFail(),
+                        new ManiaModHalfTime(),
+                    };
+
+                case ModType.DifficultyIncrease:
+                    return new Mod[]
+                    {
+                        new ManiaModHardRock(),
+                        new MultiMod
+                        {
+                            Mods = new Mod[]
+                            {
+                                new ManiaModSuddenDeath(),
+                                new ManiaModPerfect(),
+                            },
+                        },
+                        new MultiMod
+                        {
+                            Mods = new Mod[]
+                            {
+                                new ManiaModDoubleTime(),
+                                new ManiaModNightcore(),
+                            },
+                        },
+                        new ManiaModHidden(),
+                        new ManiaModFlashlight(),
+                    };
+
+                case ModType.Special:
+                    return new Mod[]
+                    {
+                        new MultiMod
+                        {
+                            Mods = new Mod[]
+                            {
+                                new ManiaModKey4(),
+                                new ManiaModKey5(),
+                                new ManiaModKey6(),
+                                new ManiaModKey7(),
+                                new ManiaModKey8(),
+                                new ManiaModKey9(),
+                                new ManiaModKey1(),
+                                new ManiaModKey2(),
+                                new ManiaModKey3(),
+                            },
+                        },
+                        new ManiaModKeyCoop(),
+                        new ManiaModRandom(),
+                        new MultiMod
+                        {
+                            Mods = new Mod[]
+                            {
+                                new ModAutoplay(),
+                                new ModCinema(),
+                            },
+                        },
+                    };
+
+                default:
+                    return new Mod[] { };
+            }
+        }
+
         protected override PlayMode PlayMode => PlayMode.Mania;
 
         public override FontAwesome Icon => FontAwesome.fa_osu_mania_o;
 
         public override ScoreProcessor CreateScoreProcessor(int hitObjectCount) => null;
 
-        public override HitObjectParser CreateHitObjectParser() => new OsuHitObjectParser();
+        public override HitObjectParser CreateHitObjectParser() => new NullHitObjectParser();
+
+        public override DifficultyCalculator CreateDifficultyCalculator(Beatmap beatmap) => new ManiaDifficultyCalculator(beatmap);
     }
 }

osu.Game.Modes.Mania/Objects/Drawable/DrawableNote.cs

@@ -4,7 +4,7 @@
 using osu.Framework.Allocation;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
-using osu.Framework.Graphics.Transformations;
+using osu.Framework.Graphics.Transforms;
 using osu.Framework.Graphics;
 using OpenTK;
 

osu.Game.Modes.Mania/OpenTK.dll.config

@@ -1,8 +1,7 @@
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
-
 <configuration>
   <dllmap os="linux" dll="opengl32.dll" target="libGL.so.1"/>
   <dllmap os="linux" dll="glu32.dll" target="libGLU.so.1"/>

osu.Game.Modes.Mania/Properties/AssemblyInfo.cs

@@ -2,7 +2,6 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System.Reflection;
-using System.Runtime.CompilerServices;
 using System.Runtime.InteropServices;
 
 // General Information about an assembly is controlled through the following 

osu.Game.Modes.Mania/UI/ManiaComboCounter.cs

@@ -2,7 +2,7 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Transformations;
+using osu.Framework.Graphics.Transforms;
 using osu.Game.Modes.Taiko.UI;
 using OpenTK.Graphics;
 

osu.Game.Modes.Mania/app.config

@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
-
 <configuration>
   <runtime>
     <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">

osu.Game.Modes.Mania/osu.Game.Modes.Mania.csproj

@@ -33,7 +33,7 @@
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="OpenTK, Version=2.0.0.0, Culture=neutral, PublicKeyToken=bad199fe84eb3df4, processorArchitecture=MSIL">
-      <HintPath>..\packages\ppy.OpenTK.2.0.50727.1339\lib\net45\OpenTK.dll</HintPath>
+      <HintPath>$(SolutionDir)\packages\ppy.OpenTK.2.0.50727.1340\lib\net45\OpenTK.dll</HintPath>
       <Private>True</Private>
     </Reference>
     <Reference Include="System" />
@@ -47,6 +47,7 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="ManiaDifficultyCalculator.cs" />
     <Compile Include="Objects\Drawable\DrawableNote.cs" />
     <Compile Include="Objects\HoldNote.cs" />
     <Compile Include="Objects\ManiaBaseHit.cs" />
@@ -57,6 +58,7 @@
     <Compile Include="UI\ManiaHitRenderer.cs" />
     <Compile Include="UI\ManiaPlayfield.cs" />
     <Compile Include="ManiaRuleset.cs" />
+    <Compile Include="ManiaMod.cs" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\osu-framework\osu.Framework\osu.Framework.csproj">

osu.Game.Modes.Mania/packages.config

@@ -1,9 +1,8 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
-
 <packages>
-  <package id="ppy.OpenTK" version="2.0.50727.1339" targetFramework="net45" />
+  <package id="ppy.OpenTK" version="2.0.50727.1340" targetFramework="net45" />
 </packages>

osu.Game.Modes.Osu/Objects/Drawables/Connections/ConnectionRenderer.cs

@@ -0,0 +1,21 @@
+// 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.Containers;
+using osu.Game.Modes.Objects;
+using System.Collections.Generic;
+
+namespace osu.Game.Modes.Osu.Objects.Drawables.Connections
+{
+    /// <summary>
+    /// Connects hit objects visually, for example with follow points.
+    /// </summary>
+    public abstract class ConnectionRenderer<T> : Container
+        where T : HitObject
+    {
+        /// <summary>
+        /// Hit objects to create connections for
+        /// </summary>
+        public abstract IEnumerable<T> HitObjects { get; set; }
+    }
+}

osu.Game.Modes.Osu/Objects/Drawables/Connections/FollowPoint.cs

@@ -0,0 +1,67 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using OpenTK;
+using OpenTK.Graphics;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Transforms;
+using osu.Game.Graphics;
+
+namespace osu.Game.Modes.Osu.Objects.Drawables.Connections
+{
+    public class FollowPoint : Container
+    {
+        public double StartTime;
+        public double EndTime;
+        public Vector2 EndPosition;
+
+        const float width = 8;
+
+        public FollowPoint()
+        {
+            Origin = Anchor.Centre;
+            Alpha = 0;
+
+            Masking = true;
+            AutoSizeAxes = Axes.Both;
+            CornerRadius = width / 2;
+            EdgeEffect = new EdgeEffect
+            {
+                Type = EdgeEffectType.Glow,
+                Colour = Color4.White.Opacity(0.2f),
+                Radius = 4,
+            };
+            
+            Children = new Drawable[]
+            {
+                new Box
+                {
+                    Size = new Vector2(width),
+                    BlendingMode = BlendingMode.Additive,
+                    Origin = Anchor.Centre,
+                    Anchor = Anchor.Centre,
+                    Alpha = 0.5f,
+                },
+            };
+        }
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            Delay(StartTime);
+            FadeIn(DrawableOsuHitObject.TIME_FADEIN);
+            ScaleTo(1.5f);
+            ScaleTo(1, DrawableOsuHitObject.TIME_FADEIN, EasingTypes.Out);
+            MoveTo(EndPosition, DrawableOsuHitObject.TIME_FADEIN, EasingTypes.Out);
+
+            Delay(EndTime - StartTime);
+            FadeOut(DrawableOsuHitObject.TIME_FADEIN);
+
+            Delay(DrawableOsuHitObject.TIME_FADEIN);
+            Expire(true);
+        }
+    }
+}

osu.Game.Modes.Osu/Objects/Drawables/Connections/FollowPointRenderer.cs

@@ -0,0 +1,97 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using OpenTK;
+using osu.Game.Modes.Osu.Objects.Drawables.Connections;
+using System;
+using System.Collections.Generic;
+
+namespace osu.Game.Modes.Osu.Objects.Drawables
+{
+    public class FollowPointRenderer : ConnectionRenderer<OsuHitObject>
+    {
+        private int pointDistance = 32;
+        /// <summary>
+        /// Determines how much space there is between points.
+        /// </summary>
+        public int PointDistance
+        {
+            get { return pointDistance; }
+            set
+            {
+                if (pointDistance == value) return;
+                pointDistance = value;
+                update();
+            }
+        }
+
+        private int preEmpt = 800;
+        /// <summary>
+        /// Follow points to the next hitobject start appearing for this many milliseconds before an hitobject's end time.
+        /// </summary>
+        public int PreEmpt
+        {
+            get { return preEmpt; }
+            set
+            {
+                if (preEmpt == value) return;
+                preEmpt = value;
+                update();
+            }
+        }
+
+        private IEnumerable<OsuHitObject> hitObjects;
+        public override IEnumerable<OsuHitObject> HitObjects
+        {
+            get { return hitObjects; }
+            set
+            {
+                hitObjects = value;
+                update();
+            }
+        }
+
+        private void update()
+        {
+            Clear();
+            if (hitObjects == null)
+                return;
+
+            OsuHitObject prevHitObject = null;
+            foreach (var currHitObject in hitObjects)
+            {
+                if (prevHitObject != null && !currHitObject.NewCombo && !(prevHitObject is Spinner) && !(currHitObject is Spinner))
+                {
+                    Vector2 startPosition = prevHitObject.EndPosition;
+                    Vector2 endPosition = currHitObject.Position;
+                    double startTime = prevHitObject.EndTime;
+                    double endTime = currHitObject.StartTime;
+
+                    Vector2 distanceVector = endPosition - startPosition;
+                    int distance = (int)distanceVector.Length;
+                    float rotation = (float)Math.Atan2(distanceVector.Y, distanceVector.X);
+                    double duration = endTime - startTime;
+
+                    for (int d = (int)(PointDistance * 1.5); d < distance - PointDistance; d += PointDistance)
+                    {
+                        float fraction = ((float)d / distance);
+                        Vector2 pointStartPosition = startPosition + (fraction - 0.1f) * distanceVector;
+                        Vector2 pointEndPosition = startPosition + fraction * distanceVector;
+                        double fadeOutTime = startTime + fraction * duration;
+                        double fadeInTime = fadeOutTime - PreEmpt;
+
+                        Add(new FollowPoint()
+                        {
+                            StartTime = fadeInTime,
+                            EndTime = fadeOutTime,
+                            Position = pointStartPosition,
+                            EndPosition = pointEndPosition,
+                            Rotation = rotation,
+                        });
+                    }
+                }
+                prevHitObject = currHitObject;
+            }
+        }
+    }
+}

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

@@ -2,18 +2,17 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System;
-using System.ComponentModel;
 using osu.Framework.Graphics;
-using osu.Framework.Graphics.Transformations;
+using osu.Framework.Graphics.Transforms;
 using osu.Game.Modes.Objects.Drawables;
 using osu.Game.Modes.Osu.Objects.Drawables.Pieces;
 using OpenTK;
 
 namespace osu.Game.Modes.Osu.Objects.Drawables
 {
-    public class DrawableHitCircle : DrawableOsuHitObject
+    public class DrawableHitCircle : DrawableOsuHitObject, IDrawableHitObjectWithProxiedApproach
     {
-        private HitCircle osuObject;
+        private OsuHitObject osuObject;
 
         public ApproachCircle ApproachCircle;
         private CirclePiece circle;
@@ -23,11 +22,12 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
         private NumberPiece number;
         private GlowPiece glow;
 
-        public DrawableHitCircle(HitCircle h) : base(h)
+        public DrawableHitCircle(OsuHitObject h) : base(h)
         {
+            Origin = Anchor.Centre;
+
             osuObject = h;
 
-            Origin = Anchor.Centre;
             Position = osuObject.StackedPosition;
             Scale = new Vector2(osuObject.Scale);
 
@@ -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
@@ -81,18 +84,18 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
 
             double hitOffset = Math.Abs(Judgement.TimeOffset);
 
+            OsuJudgementInfo osuJudgement = Judgement as OsuJudgementInfo;
+
             if (hitOffset < hit50)
             {
                 Judgement.Result = HitResult.Hit;
 
-                OsuJudgementInfo osuInfo = Judgement as OsuJudgementInfo;
-
                 if (hitOffset < hit300)
-                    osuInfo.Score = OsuScoreResult.Hit300;
+                    osuJudgement.Score = OsuScoreResult.Hit300;
                 else if (hitOffset < hit100)
-                    osuInfo.Score = OsuScoreResult.Hit100;
+                    osuJudgement.Score = OsuScoreResult.Hit100;
                 else if (hitOffset < hit50)
-                    osuInfo.Score = OsuScoreResult.Hit50;
+                    osuJudgement.Score = OsuScoreResult.Hit50;
             }
             else
                 Judgement.Result = HitResult.Miss;
@@ -124,6 +127,8 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
             base.UpdateState(state);
 
             ApproachCircle.FadeOut();
+
+            glow.Delay(osuObject.Duration);
             glow.FadeOut(400);
 
             switch (state)
@@ -156,5 +161,7 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
                     break;
             }
         }
+
+        public Drawable ProxiedLayer => ApproachCircle;
     }
 }

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

@@ -18,7 +18,7 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
         {
         }
 
-        public override JudgementInfo CreateJudgementInfo() => new OsuJudgementInfo();
+        public override JudgementInfo CreateJudgementInfo() => new OsuJudgementInfo { MaxScore = OsuScoreResult.Hit300 };
 
         protected override void UpdateState(ArmedState state)
         {
@@ -48,7 +48,37 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
 
     public class OsuJudgementInfo : PositionalJudgementInfo
     {
+        /// <summary>
+        /// The score the user achieved.
+        /// </summary>
         public OsuScoreResult Score;
+
+        /// <summary>
+        /// The score which would be achievable on a perfect hit.
+        /// </summary>
+        public OsuScoreResult MaxScore = OsuScoreResult.Hit300;
+
+        public int ScoreValue => scoreToInt(Score);
+
+        public int MaxScoreValue => scoreToInt(MaxScore);
+
+        private int scoreToInt(OsuScoreResult result)
+        {
+            switch (result)
+            {
+                default:
+                    return 0;
+                case OsuScoreResult.Hit50:
+                    return 50;
+                case OsuScoreResult.Hit100:
+                    return 100;
+                case OsuScoreResult.Hit300:
+                    return 300;
+                case OsuScoreResult.SliderTick:
+                    return 10;
+            }
+        }
+
         public ComboResult Combo;
     }
 
@@ -72,5 +102,7 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
         Hit100,
         [Description(@"300")]
         Hit300,
+        [Description(@"10")]
+        SliderTick
     }
 }

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

@@ -1,16 +1,17 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System.Collections.Generic;
+using OpenTK;
 using osu.Framework.Graphics;
 using osu.Game.Modes.Objects.Drawables;
 using osu.Game.Modes.Osu.Objects.Drawables.Pieces;
-using OpenTK;
-using osu.Framework.Input;
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Graphics.Containers;
 
 namespace osu.Game.Modes.Osu.Objects.Drawables
 {
-    class DrawableSlider : DrawableOsuHitObject
+    public class DrawableSlider : DrawableOsuHitObject, IDrawableHitObjectWithProxiedApproach
     {
         private Slider slider;
 
@@ -18,6 +19,8 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
 
         private List<ISliderProgress> components = new List<ISliderProgress>();
 
+        private Container<DrawableSliderTick> ticks;
+
         SliderBody body;
         SliderBall ball;
 
@@ -34,6 +37,7 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
                     Position = s.StackedPosition,
                     PathWidth = s.Scale * 64,
                 },
+                ticks = new Container<DrawableSliderTick>(),
                 bouncer1 = new SliderBouncer(s, false)
                 {
                     Position = s.Curve.PositionAt(1),
@@ -50,8 +54,10 @@ 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,
@@ -62,6 +68,26 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
             components.Add(ball);
             components.Add(bouncer1);
             components.Add(bouncer2);
+
+            AddNested(initialCircle);
+
+            var repeatDuration = s.Curve.Length / s.Velocity;
+            foreach (var tick in s.Ticks)
+            {
+                var repeatStartTime = s.StartTime + tick.RepeatIndex * repeatDuration;
+                var fadeInTime = repeatStartTime + (tick.StartTime - repeatStartTime) / 2 - (tick.RepeatIndex == 0 ? TIME_FADEIN : TIME_FADEIN / 2);
+                var fadeOutTime = repeatStartTime + repeatDuration;
+
+                var drawableTick = new DrawableSliderTick(tick)
+                {
+                    FadeInTime = fadeInTime,
+                    FadeOutTime = fadeOutTime,
+                    Position = tick.Position,
+                };
+
+                ticks.Add(drawableTick);
+                AddNested(drawableTick);
+            }
         }
 
         // Since the DrawableSlider itself is just a container without a size we need to
@@ -81,7 +107,7 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
 
             if (repeat > currentRepeat)
             {
-                if (ball.Tracking)
+                if (repeat < slider.RepeatCount && ball.Tracking)
                     PlaySample();
                 currentRepeat = repeat;
             }
@@ -95,7 +121,8 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
             if (initialCircle.Judgement?.Result != HitResult.Hit)
                 initialCircle.Position = slider.Curve.PositionAt(progress);
 
-            components.ForEach(c => c.UpdateProgress(progress, repeat));
+            foreach (var c in components) c.UpdateProgress(progress, repeat);
+            foreach (var t in ticks.Children) t.Tracking = ball.Tracking;
         }
 
         protected override void CheckJudgement(bool userTriggered)
@@ -105,8 +132,22 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
 
             if (!userTriggered && Time.Current >= HitObject.EndTime)
             {
-                j.Score = sc.Score;
-                j.Result = sc.Result;
+                var ticksCount = ticks.Children.Count() + 1;
+                var ticksHit = ticks.Children.Count(t => t.Judgement.Result == HitResult.Hit);
+                if (sc.Result == HitResult.Hit)
+                    ticksHit++;
+
+                var hitFraction = (double)ticksHit / ticksCount;
+                if (hitFraction == 1 && sc.Score == OsuScoreResult.Hit300)
+                    j.Score = OsuScoreResult.Hit300;
+                else if (hitFraction >= 0.5 && sc.Score >= OsuScoreResult.Hit100)
+                    j.Score = OsuScoreResult.Hit100;
+                else if (hitFraction > 0)
+                    j.Score = OsuScoreResult.Hit50;
+                else
+                    j.Score = OsuScoreResult.Miss;
+
+                j.Result = j.Score != OsuScoreResult.Miss ? HitResult.Hit : HitResult.Miss;
             }
         }
 
@@ -133,6 +174,8 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
 
             FadeOut(800);
         }
+
+        public Drawable ProxiedLayer => initialCircle.ApproachCircle;
     }
 
     internal interface ISliderProgress

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

@@ -0,0 +1,120 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using osu.Framework.Allocation;
+using osu.Framework.Audio;
+using osu.Framework.Audio.Sample;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Transforms;
+using osu.Game.Beatmaps.Samples;
+using osu.Game.Modes.Objects.Drawables;
+using OpenTK;
+using OpenTK.Graphics;
+
+namespace osu.Game.Modes.Osu.Objects.Drawables
+{
+    public class DrawableSliderTick : DrawableOsuHitObject
+    {
+        private SliderTick sliderTick;
+
+        public double FadeInTime;
+        public double FadeOutTime;
+
+        public bool Tracking;
+
+        public override bool RemoveWhenNotAlive => false;
+
+        public override JudgementInfo CreateJudgementInfo() => new OsuJudgementInfo { MaxScore = OsuScoreResult.SliderTick };
+
+        public DrawableSliderTick(SliderTick sliderTick) : base(sliderTick)
+        {
+            this.sliderTick = sliderTick;
+
+            Size = new Vector2(16) * sliderTick.Scale;
+
+            Masking = true;
+            CornerRadius = Size.X / 2;
+
+            Origin = Anchor.Centre;
+
+            BorderThickness = 2;
+            BorderColour = Color4.White;
+
+            Children = new Drawable[]
+            {
+                new Box
+                {
+                    RelativeSizeAxes = Axes.Both,
+                    Colour = sliderTick.Colour,
+                    Alpha = 0.3f,
+                }
+            };
+        }
+
+        private SampleChannel sample;
+
+        [BackgroundDependencyLoader]
+        private void load(AudioManager audio)
+        {
+            string sampleSet = (HitObject.Sample?.Set ?? SampleSet.Normal).ToString().ToLower();
+
+            sample = audio.Sample.Get($@"Gameplay/{sampleSet}-slidertick");
+        }
+
+        protected override void PlaySample()
+        {
+            sample?.Play();
+        }
+
+
+        protected override void CheckJudgement(bool userTriggered)
+        {
+            var j = Judgement as OsuJudgementInfo;
+
+            if (Judgement.TimeOffset >= 0)
+            {
+                j.Result = Tracking ? HitResult.Hit : HitResult.Miss;
+                j.Score = Tracking ? OsuScoreResult.SliderTick : OsuScoreResult.Miss;
+            }
+        }
+        
+        protected override void UpdatePreemptState()
+        {
+            var animIn = Math.Min(150, sliderTick.StartTime - FadeInTime);
+
+            ScaleTo(0.5f);
+            ScaleTo(1.2f, animIn);
+            FadeIn(animIn);
+
+            Delay(animIn);
+            ScaleTo(1, 150, EasingTypes.Out);
+
+            Delay(-animIn);
+        }
+
+        protected override void UpdateState(ArmedState state)
+        {
+            if (!IsLoaded) return;
+
+            base.UpdateState(state);
+
+            switch (state)
+            {
+                case ArmedState.Idle:
+                    Delay(FadeOutTime - sliderTick.StartTime);
+                    FadeOut();
+                    break;
+                case ArmedState.Miss:
+                    FadeOut(160);
+                    FadeColour(Color4.Red, 80);
+                    break;
+                case ArmedState.Hit:
+                    FadeOut(120, EasingTypes.OutQuint);
+                    ScaleTo(Scale * 1.5f, 120, EasingTypes.OutQuint);
+                    break;
+            }
+        }
+    }
+}

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

@@ -0,0 +1,158 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Transforms;
+using osu.Framework.MathUtils;
+using osu.Game.Modes.Objects.Drawables;
+using osu.Game.Modes.Osu.Objects.Drawables.Pieces;
+using OpenTK;
+using OpenTK.Graphics;
+
+namespace osu.Game.Modes.Osu.Objects.Drawables
+{
+    public class DrawableSpinner : DrawableOsuHitObject
+    {
+        private Spinner spinner;
+
+        private SpinnerDisc disc;
+        private SpinnerBackground background;
+        private Container circleContainer;
+        private DrawableHitCircle circle;
+
+        public DrawableSpinner(Spinner s) : base(s)
+        {
+            Origin = Anchor.Centre;
+            Position = s.Position;
+
+            //take up full playfield.
+            Size = new Vector2(512);
+
+            spinner = s;
+
+            Children = new Drawable[]
+            {
+                background = new SpinnerBackground
+                {
+                    Alpha = 0,
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    DiscColour = Color4.Black
+                },
+                disc = new SpinnerDisc
+                {
+                    Alpha = 0,
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    DiscColour = s.Colour
+                },
+                circleContainer = new Container
+                {
+                    AutoSizeAxes = Axes.Both,
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Children = new []
+                    {
+                        circle = new DrawableHitCircle(s)
+                        {
+                            Interactive = false,
+                            Position = Vector2.Zero,
+                            Anchor = Anchor.Centre,
+                        }
+                    }
+                }
+            };
+
+            background.Scale = scaleToCircle;
+            disc.Scale = scaleToCircle;
+        }
+
+        public override bool Contains(Vector2 screenSpacePos) => true;
+
+        protected override void CheckJudgement(bool userTriggered)
+        {
+            if (Time.Current < HitObject.StartTime) return;
+
+            var j = Judgement as OsuJudgementInfo;
+
+            disc.ScaleTo(Interpolation.ValueAt(Math.Sqrt(Progress), scaleToCircle, Vector2.One, 0, 1), 100);
+
+            if (Progress >= 1)
+                disc.Complete = true;
+
+            if (!userTriggered && Time.Current >= HitObject.EndTime)
+            {
+                if (Progress >= 1)
+                {
+                    j.Score = OsuScoreResult.Hit300;
+                    j.Result = HitResult.Hit;
+                }
+                else if (Progress > .9)
+                {
+                    j.Score = OsuScoreResult.Hit100;
+                    j.Result = HitResult.Hit;
+                }
+                else if (Progress > .75)
+                {
+                    j.Score = OsuScoreResult.Hit50;
+                    j.Result = HitResult.Hit;
+                }
+                else
+                {
+                    j.Score = OsuScoreResult.Miss;
+                    if (Time.Current >= HitObject.EndTime)
+                        j.Result = HitResult.Miss;
+                }
+            }
+        }
+
+        private Vector2 scaleToCircle => (circle.Scale * circle.DrawWidth / DrawWidth) * 0.95f;
+
+        private float spinsPerMinuteNeeded = 100 + (5 * 15); //TODO: read per-map OD and place it on the 5
+
+        private float rotationsNeeded => (float)(spinsPerMinuteNeeded * (spinner.EndTime - spinner.StartTime) / 60000f);
+
+        public float Progress => MathHelper.Clamp(disc.RotationAbsolute / 360 / rotationsNeeded, 0, 1);
+
+        protected override void UpdatePreemptState()
+        {
+            base.UpdatePreemptState();
+
+            circleContainer.ScaleTo(1, 400, EasingTypes.OutElastic);
+
+            background.Delay(TIME_PREEMPT - 500);
+
+            background.ScaleTo(scaleToCircle * 1.2f, 400, EasingTypes.OutQuint);
+            background.FadeIn(200);
+
+            background.Delay(400);
+            background.ScaleTo(1, 250, EasingTypes.OutQuint);
+
+            disc.Delay(TIME_PREEMPT - 50);
+            disc.FadeIn(200);
+        }
+
+        protected override void UpdateState(ArmedState state)
+        {
+            if (!IsLoaded) return;
+
+            base.UpdateState(state);
+
+            Delay(HitObject.Duration, true);
+
+            FadeOut(160);
+
+            switch (state)
+            {
+                case ArmedState.Hit:
+                    ScaleTo(Scale * 1.2f, 320, EasingTypes.Out);
+                    break;
+                case ArmedState.Miss:
+                    ScaleTo(Scale * 0.8f, 320, EasingTypes.In);
+                    break;
+            }
+        }
+    }
+}

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

@@ -5,14 +5,15 @@ using osu.Framework.Extensions;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
-using osu.Framework.Graphics.Transformations;
+using osu.Framework.Graphics.Transforms;
+using osu.Game.Graphics.Sprites;
 using osu.Game.Modes.Objects.Drawables;
 using OpenTK;
 using OpenTK.Graphics;
 
 namespace osu.Game.Modes.Osu.Objects.Drawables
 {
-    public class HitExplosion : FlowContainer
+    public class HitExplosion : FillFlowContainer
     {
         private readonly OsuJudgementInfo judgement;
         private SpriteText line1;
@@ -24,13 +25,13 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
             AutoSizeAxes = Axes.Both;
             Origin = Anchor.Centre;
 
-            Direction = FlowDirection.VerticalOnly;
+            Direction = FillDirection.Down;
             Spacing = new Vector2(0, 2);
             Position = (h?.StackedEndPosition ?? Vector2.Zero) + judgement.PositionOffset;
 
             Children = new Drawable[]
             {
-                line1 = new SpriteText
+                line1 = new OsuSpriteText
                 {
                     Anchor = Anchor.TopCentre,
                     Origin = Anchor.TopCentre,
@@ -38,7 +39,7 @@ namespace osu.Game.Modes.Osu.Objects.Drawables
                     Font = @"Venera",
                     TextSize = 16,
                 },
-                line2 = new SpriteText
+                line2 = new OsuSpriteText
                 {
                     Text = judgement.Combo.GetDescription(),
                     Font = @"Venera",

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

@@ -1,14 +1,11 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System;
 using osu.Framework.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
 using osu.Framework.Graphics.Textures;
-using osu.Framework.Input;
-using OpenTK;
 
 namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
 {

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

@@ -14,9 +14,8 @@ namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
 {
     public class CirclePiece : Container
     {
-
         private Sprite disc;
-        private Triangles triangles;
+
 
         public Func<bool> Hit;
 
@@ -36,10 +35,11 @@ namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
                     Anchor = Anchor.Centre,
                     Origin = Anchor.Centre
                 },
-                triangles = new Triangles
+                new TrianglesPiece
                 {
+                    RelativeSizeAxes = Axes.Both,
                     BlendingMode = BlendingMode.Additive,
-                    RelativeSizeAxes = Axes.Both
+                    Alpha = 0.5f,
                 }
             };
         }

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

@@ -21,10 +21,11 @@ namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
 
             Children = new Drawable[]
             {
-                new Triangles
+                new TrianglesPiece
                 {
                     BlendingMode = BlendingMode.Additive,
-                    RelativeSizeAxes = Axes.Both
+                    RelativeSizeAxes = Axes.Both,
+                    Alpha = 0.2f,
                 }
             };
         }

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

@@ -1,38 +1,56 @@
 // 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.Allocation;
 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.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/Drawables/Pieces/RingPiece.cs

@@ -1,11 +1,9 @@
 // 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.Allocation;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
-using osu.Framework.Graphics.Textures;
 using OpenTK;
 using OpenTK.Graphics;
 

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

@@ -4,14 +4,13 @@
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Sprites;
-using osu.Framework.Graphics.Transformations;
+using osu.Framework.Graphics.Transforms;
 using osu.Framework.Input;
-using OpenTK;
 using OpenTK.Graphics;
 
 namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
 {
-    public class SliderBall : Container, ISliderProgress
+    public class SliderBall : CircularContainer, ISliderProgress
     {
         private readonly Slider slider;
         private Box follow;
@@ -39,7 +38,7 @@ namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
                     Height = width,
                     Alpha = 0,
                 },
-                new Container
+                new CircularContainer
                 {
                     Masking = true,
                     AutoSizeAxes = Axes.Both,
@@ -48,7 +47,6 @@ namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
                     BorderThickness = 10,
                     BorderColour = Color4.White,
                     Alpha = 1,
-                    CornerRadius = width / 2,
                     Children = new[]
                     {
                         new Box
@@ -104,8 +102,8 @@ namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
         {
             base.Update();
 
-            CornerRadius = DrawWidth / 2;
-            Tracking = canCurrentlyTrack && lastState != null && Contains(lastState.Mouse.NativeState.Position) && lastState.Mouse.HasMainButtonPressed;
+            if (Time.Current < slider.EndTime)
+                Tracking = canCurrentlyTrack && lastState != null && Contains(lastState.Mouse.NativeState.Position) && lastState.Mouse.HasMainButtonPressed;
         }
 
         public void UpdateProgress(double progress, int repeat)

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

@@ -8,7 +8,7 @@ using osu.Framework.Configuration;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.OpenGL.Textures;
-using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Lines;
 using osu.Framework.Graphics.Textures;
 using osu.Game.Configuration;
 using OpenTK;

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

@@ -1,14 +1,8 @@
 // Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Sprites;
 using osu.Game.Graphics;
 
 namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces

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

@@ -0,0 +1,10 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
+{
+    public class SpinnerBackground : SpinnerDisc
+    {
+        public override bool HandleInput => false;
+    }
+}

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

@@ -0,0 +1,205 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Linq;
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Colour;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using osu.Framework.Graphics.Transforms;
+using osu.Framework.Input;
+using osu.Game.Graphics;
+using OpenTK;
+using OpenTK.Graphics;
+
+namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
+{
+    public class SpinnerDisc : CircularContainer
+    {
+        public override bool Contains(Vector2 screenSpacePos) => true;
+
+        protected Sprite Disc;
+
+        public SRGBColour DiscColour
+        {
+            get { return Disc.Colour; }
+            set { Disc.Colour = value; }
+        }
+
+        Color4 completeColour;
+
+        [BackgroundDependencyLoader]
+        private void load(OsuColour colours)
+        {
+            completeColour = colours.YellowLight.Opacity(0.8f);
+        }
+
+        class SpinnerBorder : Container
+        {
+            public SpinnerBorder()
+            {
+                Origin = Anchor.Centre;
+                Anchor = Anchor.Centre;
+                RelativeSizeAxes = Axes.Both;
+
+                layout();
+            }
+
+            private int lastLayoutDotCount;
+            private void layout()
+            {
+                int count = (int)(MathHelper.Pi * ScreenSpaceDrawQuad.Width / 9);
+
+                if (count == lastLayoutDotCount) return;
+
+                lastLayoutDotCount = count;
+
+                while (Children.Count() < count)
+                {
+                    Add(new CircularContainer
+                    {
+                        Colour = Color4.White,
+                        RelativePositionAxes = Axes.Both,
+                        Origin = Anchor.Centre,
+                        Size = new Vector2(1 / ScreenSpaceDrawQuad.Width * 2000),
+                        Children = new[]
+                        {
+                            new Box
+                            {
+                                Origin = Anchor.Centre,
+                                Anchor = Anchor.Centre,
+                                RelativeSizeAxes = Axes.Both,
+                            }
+                        }
+                    });
+                }
+
+                var size = new Vector2(1 / ScreenSpaceDrawQuad.Width * 2000);
+
+                int i = 0;
+                foreach (var d in Children)
+                {
+                    d.Size = size;
+                    d.Position = new Vector2(
+                        0.5f + (float)Math.Sin((float)i / count * 2 * MathHelper.Pi) / 2,
+                        0.5f + (float)Math.Cos((float)i / count * 2 * MathHelper.Pi) / 2
+                    );
+
+                    i++;
+                }
+            }
+
+            protected override void Update()
+            {
+                base.Update();
+                layout();
+            }
+        }
+
+        public SpinnerDisc()
+        {
+            RelativeSizeAxes = Axes.Both;
+
+            Children = new Drawable[]
+            {
+                Disc = new Box
+                {
+                    Origin = Anchor.Centre,
+                    Anchor = Anchor.Centre,
+                    RelativeSizeAxes = Axes.Both,
+                    Alpha = 0.2f,
+                },
+                new SpinnerBorder()
+            };
+        }
+
+        bool tracking;
+        public bool Tracking
+        {
+            get { return tracking; }
+            set
+            {
+                if (value == tracking) return;
+
+                tracking = value;
+
+                Disc.FadeTo(tracking ? 0.5f : 0.2f, 100);
+            }
+        }
+
+        bool complete;
+        public bool Complete
+        {
+            get { return complete; }
+            set
+            {
+                if (value == complete) return;
+
+                complete = value;
+
+                Disc.FadeColour(completeColour, 200);
+
+                updateCompleteTick();
+            }
+        }
+
+        protected override bool OnMouseDown(InputState state, MouseDownEventArgs args)
+        {
+            Tracking = true;
+            return base.OnMouseDown(state, args);
+        }
+
+        protected override bool OnMouseUp(InputState state, MouseUpEventArgs args)
+        {
+            Tracking = false;
+            return base.OnMouseUp(state, args);
+        }
+
+        protected override bool OnMouseMove(InputState state)
+        {
+            Tracking |= state.Mouse.HasMainButtonPressed;
+            mousePosition = state.Mouse.Position;
+            return base.OnMouseMove(state);
+        }
+
+        private Vector2 mousePosition;
+
+        private float lastAngle;
+        private float currentRotation;
+        public float RotationAbsolute;
+
+        private int completeTick;
+
+        private bool updateCompleteTick() => completeTick != (completeTick = (int)(RotationAbsolute / 360));
+
+        protected override void Update()
+        {
+            base.Update();
+
+            var thisAngle = -(float)MathHelper.RadiansToDegrees(Math.Atan2(mousePosition.X - DrawSize.X / 2, mousePosition.Y - DrawSize.Y / 2));
+            if (tracking)
+            {
+                if (thisAngle - lastAngle > 180)
+                    lastAngle += 360;
+                else if (lastAngle - thisAngle > 180)
+                    lastAngle -= 360;
+
+                currentRotation += thisAngle - lastAngle;
+                RotationAbsolute += Math.Abs(thisAngle - lastAngle);
+            }
+            lastAngle = thisAngle;
+
+            if (Complete && updateCompleteTick())
+            {
+                Disc.Flush(flushType: typeof(TransformAlpha));
+                Disc.FadeTo(0.75f, 30, EasingTypes.OutExpo);
+                Disc.Delay(30);
+                Disc.FadeTo(0.5f, 250, EasingTypes.OutQuint);
+            }
+
+            RotateTo(currentRotation, 100, EasingTypes.OutExpo);
+        }
+    }
+}

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

@@ -1,46 +0,0 @@
-// 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.Allocation;
-using osu.Framework.Graphics;
-using osu.Framework.Graphics.Containers;
-using osu.Framework.Graphics.Sprites;
-using osu.Framework.Graphics.Textures;
-using osu.Framework.MathUtils;
-using OpenTK;
-
-namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
-{
-    public class Triangles : Container<Triangle>
-    {
-        public override bool HandleInput => false;
-
-        protected override void LoadComplete()
-        {
-            base.LoadComplete();
-
-            const float size = 100;
-            for (int i = 0; i < 10; i++)
-            {
-                Add(new Triangle
-                {
-                    Origin = Anchor.Centre,
-                    RelativePositionAxes = Axes.Both,
-                    Position = new Vector2(RNG.NextSingle(), RNG.NextSingle()),
-                    Scale = new Vector2(RNG.NextSingle() * 0.4f + 0.2f),
-                    // Scaling height by 0.866 results in equiangular triangles (== 60° and equal side length)
-                    Size = new Vector2(size, 0.866f * size),
-                    Alpha = RNG.NextSingle() * 0.3f,
-                });
-            }
-        }
-
-        protected override void Update()
-        {
-            base.Update();
-
-            foreach (Drawable d in Children)
-                d.Position -= new Vector2(0, (float)(d.Scale.X * (Time.Elapsed / 2880)));
-        }
-    }
-}

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

@@ -0,0 +1,26 @@
+// 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.Game.Graphics.Backgrounds;
+
+namespace osu.Game.Modes.Osu.Objects.Drawables.Pieces
+{
+    public class TrianglesPiece : Triangles
+    {
+        protected override bool ExpireOffScreenTriangles => false;
+        protected override bool CreateNewTriangles => false;
+        protected override float SpawnRatio => 0.5f;
+
+        public TrianglesPiece()
+        {
+            TriangleScale = 1.2f;
+            HideAlphaDiscrepancies = false;
+        }
+
+        protected override void Update()
+        {
+            if (IsPresent)
+                base.Update();
+        }
+    }
+}

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

@@ -5,5 +5,6 @@ namespace osu.Game.Modes.Osu.Objects
 {
     public class HitCircle : OsuHitObject
     {
+        public override HitObjectType Type => HitObjectType.Circle;
     }
 }

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

@@ -2,7 +2,6 @@
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
 using System;
-using osu.Game.Beatmaps.Samples;
 using osu.Game.Modes.Objects;
 using OpenTK;
 using osu.Game.Beatmaps;
@@ -25,25 +24,25 @@ namespace osu.Game.Modes.Osu.Objects
 
         public float Scale { get; set; } = 1;
 
+        public abstract HitObjectType Type { get; }
+
         public override void SetDefaultsFromBeatmap(Beatmap beatmap)
         {
             base.SetDefaultsFromBeatmap(beatmap);
 
             Scale = (1.0f - 0.7f * (beatmap.BeatmapInfo.BaseDifficulty.CircleSize - 5) / 5) / 2;
         }
+    }
 
-        [Flags]
-        internal enum HitObjectType
-        {
-            Circle = 1,
-            Slider = 2,
-            NewCombo = 4,
-            CircleNewCombo = 5,
-            SliderNewCombo = 6,
-            Spinner = 8,
-            ColourHax = 122,
-            Hold = 128,
-            ManiaLong = 128,
-        }
+    [Flags]
+    public enum HitObjectType
+    {
+        Circle = 1 << 0,
+        Slider = 1 << 1,
+        NewCombo = 1 << 2,
+        Spinner = 1 << 3,
+        ColourHax = 122,
+        Hold = 1 << 7,
+        SliderTick = 1 << 8,
     }
 }

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.Osu/Objects/OsuHitObjectDifficulty.cs

@@ -0,0 +1,201 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using OpenTK;
+using System;
+using System.Diagnostics;
+using System.Linq;
+
+namespace osu.Game.Modes.Osu.Objects
+{
+    class OsuHitObjectDifficulty
+    {
+        /// <summary>
+        /// Factor by how much speed / aim strain decays per second.
+        /// </summary>
+        /// <remarks>
+        /// These values are results of tweaking a lot and taking into account general feedback.
+        /// Opinionated observation: Speed is easier to maintain than accurate jumps.
+        /// </remarks>
+        internal static readonly double[] DECAY_BASE = { 0.3, 0.15 };
+
+        /// <summary>
+        /// Pseudo threshold values to distinguish between "singles" and "streams"
+        /// </summary>
+        /// <remarks>
+        ///  Of course the border can not be defined clearly, therefore the algorithm has a smooth transition between those values.
+        ///  They also are based on tweaking and general feedback.
+        /// </remarks>
+        private const double stream_spacing_threshold = 110,
+                             single_spacing_threshold = 125;
+
+        /// <summary>
+        /// Scaling values for weightings to keep aim and speed difficulty in balance.
+        /// </summary>
+        /// <remarks>
+        /// Found from testing a very large map pool (containing all ranked maps) and keeping the average values the same.
+        /// </remarks>
+        private static readonly double[] spacing_weight_scaling = { 1400, 26.25 };
+
+        /// <summary>
+        /// Almost the normed diameter of a circle (104 osu pixel). That is -after- position transforming.
+        /// </summary>
+        private const double almost_diameter = 90;
+
+        internal OsuHitObject BaseHitObject;
+        internal double[] Strains = { 1, 1 };
+
+        internal int MaxCombo = 1;
+
+        private float scalingFactor;
+        private float lazySliderLength;
+
+        private Vector2 startPosition;
+        private Vector2 endPosition;
+
+        internal OsuHitObjectDifficulty(OsuHitObject baseHitObject)
+        {
+            BaseHitObject = baseHitObject;
+            float circleRadius = baseHitObject.Scale * 64;
+
+            Slider slider = BaseHitObject as Slider;
+            if (slider != null)
+                MaxCombo += slider.Ticks.Count();
+
+            // We will scale everything by this factor, so we can assume a uniform CircleSize among beatmaps.
+            scalingFactor = (52.0f / circleRadius);
+            if (circleRadius < 30)
+            {
+                float smallCircleBonus = Math.Min(30.0f - circleRadius, 5.0f) / 50.0f;
+                scalingFactor *= 1.0f + smallCircleBonus;
+            }
+
+            lazySliderLength = 0;
+            startPosition = baseHitObject.StackedPosition;
+
+            // Calculate approximation of lazy movement on the slider
+            if (slider != null)
+            {
+                float sliderFollowCircleRadius = circleRadius * 3; // Not sure if this is correct, but here we do not need 100% exact values. This comes pretty darn close in my tests.
+
+                // For simplifying this step we use actual osu! coordinates and simply scale the length, that we obtain by the ScalingFactor later
+                Vector2 cursorPos = startPosition;
+
+                Action<Vector2> addSliderVertex = delegate (Vector2 pos)
+                {
+                    Vector2 difference = pos - cursorPos;
+                    float distance = difference.Length;
+
+                    // Did we move away too far?
+                    if (distance > sliderFollowCircleRadius)
+                    {
+                        // Yep, we need to move the cursor
+                        difference.Normalize(); // Obtain the direction of difference. We do no longer need the actual difference
+                        distance -= sliderFollowCircleRadius;
+                        cursorPos += difference * distance; // We move the cursor just as far as needed to stay in the follow circle
+                        lazySliderLength += distance;
+                    }
+                };
+
+                // Actual computation of the first lazy curve
+                foreach (var tick in slider.Ticks)
+                    addSliderVertex(tick.StackedPosition);
+
+                addSliderVertex(baseHitObject.StackedEndPosition);
+
+                lazySliderLength *= scalingFactor;
+                endPosition = cursorPos;
+            }
+            // We have a normal HitCircle or a spinner
+            else
+                endPosition = startPosition;
+        }
+
+        internal void CalculateStrains(OsuHitObjectDifficulty previousHitObject, double timeRate)
+        {
+            calculateSpecificStrain(previousHitObject, OsuDifficultyCalculator.DifficultyType.Speed, timeRate);
+            calculateSpecificStrain(previousHitObject, OsuDifficultyCalculator.DifficultyType.Aim, timeRate);
+        }
+
+        // Caution: The subjective values are strong with this one
+        private static double spacingWeight(double distance, OsuDifficultyCalculator.DifficultyType type)
+        {
+            switch (type)
+            {
+                case OsuDifficultyCalculator.DifficultyType.Speed:
+                    if (distance > single_spacing_threshold)
+                        return 2.5;
+                    else if (distance > stream_spacing_threshold)
+                        return 1.6 + 0.9 * (distance - stream_spacing_threshold) / (single_spacing_threshold - stream_spacing_threshold);
+                    else if (distance > almost_diameter)
+                        return 1.2 + 0.4 * (distance - almost_diameter) / (stream_spacing_threshold - almost_diameter);
+                    else if (distance > almost_diameter / 2)
+                        return 0.95 + 0.25 * (distance - (almost_diameter / 2)) / (almost_diameter / 2);
+                    else
+                        return 0.95;
+
+                case OsuDifficultyCalculator.DifficultyType.Aim:
+                    return Math.Pow(distance, 0.99);
+            }
+
+            Debug.Assert(false, "Invalid osu difficulty hit object type.");
+            return 0;
+        }
+
+        private void calculateSpecificStrain(OsuHitObjectDifficulty previousHitObject, OsuDifficultyCalculator.DifficultyType type, double timeRate)
+        {
+            double addition = 0;
+            double timeElapsed = (BaseHitObject.StartTime - previousHitObject.BaseHitObject.StartTime) / timeRate;
+            double decay = Math.Pow(DECAY_BASE[(int)type], timeElapsed / 1000);
+
+            if (BaseHitObject.Type == HitObjectType.Spinner)
+            {
+                // Do nothing for spinners
+            }
+            else if (BaseHitObject.Type == HitObjectType.Slider)
+            {
+                switch (type)
+                {
+                    case OsuDifficultyCalculator.DifficultyType.Speed:
+
+                        // For speed strain we treat the whole slider as a single spacing entity, since "Speed" is about how hard it is to click buttons fast.
+                        // The spacing weight exists to differentiate between being able to easily alternate or having to single.
+                        addition =
+                            spacingWeight(previousHitObject.lazySliderLength +
+                                          DistanceTo(previousHitObject), type) *
+                            spacing_weight_scaling[(int)type];
+
+                        break;
+                    case OsuDifficultyCalculator.DifficultyType.Aim:
+
+                        // For Aim strain we treat each slider segment and the jump after the end of the slider as separate jumps, since movement-wise there is no difference
+                        // to multiple jumps.
+                        addition =
+                            (
+                                spacingWeight(previousHitObject.lazySliderLength, type) +
+                                spacingWeight(DistanceTo(previousHitObject), type)
+                            ) *
+                            spacing_weight_scaling[(int)type];
+
+                        break;
+                }
+            }
+            else if (BaseHitObject.Type == HitObjectType.Circle)
+            {
+                addition = spacingWeight(DistanceTo(previousHitObject), type) * spacing_weight_scaling[(int)type];
+            }
+
+            // Scale addition by the time, that elapsed. Filter out HitObjects that are too close to be played anyway to avoid crazy values by division through close to zero.
+            // You will never find maps that require this amongst ranked maps.
+            addition /= Math.Max(timeElapsed, 50);
+
+            Strains[(int)type] = previousHitObject.Strains[(int)type] * decay + addition;
+        }
+
+        internal double DistanceTo(OsuHitObjectDifficulty other)
+        {
+            // Scale the distance by circle size.
+            return (startPosition - other.endPosition).Length * scalingFactor;
+        }
+    }
+}

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

@@ -4,9 +4,6 @@
 using System;
 using System.Collections.Generic;
 using System.Globalization;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using osu.Game.Beatmaps.Samples;
 using osu.Game.Modes.Objects;
 using OpenTK;
@@ -18,21 +15,22 @@ namespace osu.Game.Modes.Osu.Objects
         public override HitObject Parse(string text)
         {
             string[] split = text.Split(',');
-            var type = (OsuHitObject.HitObjectType)int.Parse(split[3]);
-            bool combo = type.HasFlag(OsuHitObject.HitObjectType.NewCombo);
-            type &= (OsuHitObject.HitObjectType)0xF;
-            type &= ~OsuHitObject.HitObjectType.NewCombo;
+            var type = (HitObjectType)int.Parse(split[3]);
+            bool combo = type.HasFlag(HitObjectType.NewCombo);
+            type &= (HitObjectType)0xF;
+            type &= ~HitObjectType.NewCombo;
             OsuHitObject result;
             switch (type)
             {
-                case OsuHitObject.HitObjectType.Circle:
-                    result = new HitCircle();
+                case HitObjectType.Circle:
+                    result = new HitCircle
+                    {
+                        Position = new Vector2(int.Parse(split[0]), int.Parse(split[1]))
+                    };
                     break;
-                case OsuHitObject.HitObjectType.Slider:
-                    Slider s = new Slider();
-
+                case HitObjectType.Slider:
                     CurveTypes curveType = CurveTypes.Catmull;
-                    int repeatCount = 0;
+                    int repeatCount;
                     double length = 0;
                     List<Vector2> points = new List<Vector2>();
 
@@ -79,29 +77,28 @@ namespace osu.Game.Modes.Osu.Objects
                     if (split.Length > 7)
                         length = Convert.ToDouble(split[7], CultureInfo.InvariantCulture);
 
-                    s.RepeatCount = repeatCount;
-
-                    s.Curve = new SliderCurve
+                    result = new Slider
                     {
                         ControlPoints = points,
                         Length = length,
-                        CurveType = curveType
+                        CurveType = curveType,
+                        RepeatCount = repeatCount,
+                        Position = new Vector2(int.Parse(split[0]), int.Parse(split[1]))
                     };
-
-                    s.Curve.Calculate();
-
-                    result = s;
                     break;
-                case OsuHitObject.HitObjectType.Spinner:
-                    result = new Spinner();
+                case HitObjectType.Spinner:
+                    result = new Spinner
+                    {
+                        Length = Convert.ToDouble(split[5], CultureInfo.InvariantCulture) - Convert.ToDouble(split[2], CultureInfo.InvariantCulture),
+                        Position = new Vector2(512, 384) / 2,
+                    };
                     break;
                 default:
-                    //throw new InvalidOperationException($@"Unknown hit object type {type}");
-                    return null;
+                    throw new InvalidOperationException($@"Unknown hit object type {type}");
             }
-            result.Position = new Vector2(int.Parse(split[0]), int.Parse(split[1]));
-            result.StartTime = double.Parse(split[2]);
-            result.Sample = new HitSampleInfo {
+            result.StartTime = Convert.ToDouble(split[2], CultureInfo.InvariantCulture);
+            result.Sample = new HitSampleInfo
+            {
                 Type = (SampleType)int.Parse(split[4]),
                 Set = SampleSet.Soft,
             };

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

@@ -1,8 +1,12 @@
 // 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.Game.Beatmaps;
 using OpenTK;
+using osu.Game.Beatmaps;
+using osu.Game.Beatmaps.Samples;
+using osu.Game.Beatmaps.Timing;
+using System;
+using System.Collections.Generic;
 
 namespace osu.Game.Modes.Osu.Objects
 {
@@ -19,23 +23,95 @@ namespace osu.Game.Modes.Osu.Objects
             set
             {
                 stackHeight = value;
-                if (Curve != null)
-                    Curve.Offset = StackOffset;
+                Curve.Offset = StackOffset;
             }
         }
 
+        public List<Vector2> ControlPoints
+        {
+            get { return Curve.ControlPoints; }
+            set { Curve.ControlPoints = value; }
+        }
+
+        public double Length
+        {
+            get { return Curve.Length; }
+            set { Curve.Length = value; }
+        }
+
+        public CurveTypes CurveType
+        {
+            get { return Curve.CurveType; }
+            set { Curve.CurveType = value; }
+        }
+
         public double Velocity;
+        public double TickDistance;
 
         public override void SetDefaultsFromBeatmap(Beatmap beatmap)
         {
             base.SetDefaultsFromBeatmap(beatmap);
 
-            Velocity = 100 / beatmap.BeatLengthAt(StartTime, true) * beatmap.BeatmapInfo.BaseDifficulty.SliderMultiplier;
+            var baseDifficulty = beatmap.BeatmapInfo.BaseDifficulty;
+
+            ControlPoint overridePoint;
+            ControlPoint timingPoint = beatmap.TimingPointAt(StartTime, out overridePoint);
+            var velocityAdjustment = overridePoint?.VelocityAdjustment ?? 1;
+            var baseVelocity = 100 * baseDifficulty.SliderMultiplier / velocityAdjustment;
+
+            Velocity = baseVelocity / timingPoint.BeatLength;
+            TickDistance = baseVelocity / baseDifficulty.SliderTickRate;
         }
 
-        public int RepeatCount;
+        public int RepeatCount = 1;
 
-        public SliderCurve Curve;
+        internal readonly SliderCurve Curve = new SliderCurve();
+
+        public IEnumerable<SliderTick> Ticks
+        {
+            get
+            {
+                if (TickDistance == 0) yield break;
+
+                var length = Curve.Length;
+                var tickDistance = Math.Min(TickDistance, length);
+                var repeatDuration = length / Velocity;
+
+                var minDistanceFromEnd = Velocity * 0.01;
+
+                for (var repeat = 0; repeat < RepeatCount; repeat++)
+                {
+                    var repeatStartTime = StartTime + repeat * repeatDuration;
+                    var reversed = repeat % 2 == 1;
+
+                    for (var d = tickDistance; d <= length; d += tickDistance)
+                    {
+                        if (d > length - minDistanceFromEnd)
+                            break;
+
+                        var distanceProgress = d / length;
+                        var timeProgress = reversed ? 1 - distanceProgress : distanceProgress;
+
+                        yield return new SliderTick
+                        {
+                            RepeatIndex = repeat,
+                            StartTime = repeatStartTime + timeProgress * repeatDuration,
+                            Position = Curve.PositionAt(distanceProgress),
+                            StackHeight = StackHeight,
+                            Scale = Scale,
+                            Colour = Colour,
+                            Sample = new HitSampleInfo
+                            {
+                                Type = SampleType.None,
+                                Set = SampleSet.Soft,
+                            },
+                        };
+                    }
+                }
+            }
+        }
+
+        public override HitObjectType Type => HitObjectType.Slider;
     }
 
     public enum CurveTypes

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

@@ -5,7 +5,6 @@ using System.Collections.Generic;
 using OpenTK;
 using System.Linq;
 using osu.Framework.MathUtils;
-using System.Diagnostics;
 
 namespace osu.Game.Modes.Osu.Objects
 {
@@ -15,7 +14,7 @@ namespace osu.Game.Modes.Osu.Objects
 
         public List<Vector2> ControlPoints;
 
-        public CurveTypes CurveType;
+        public CurveTypes CurveType = CurveTypes.PerfectCurve;
 
         public Vector2 Offset;
 
@@ -29,26 +28,21 @@ namespace osu.Game.Modes.Osu.Objects
                 case CurveTypes.Linear:
                     return subControlPoints;
                 case CurveTypes.PerfectCurve:
-                    // If we have a different amount than 3 control points, use bezier for perfect curves.
-                    if (ControlPoints.Count != 3)
-                        return new BezierApproximator(subControlPoints).CreateBezier();
-                    else
-                    {
-                        Debug.Assert(subControlPoints.Count == 3);
+                    //we can only use CircularArc iff we have exactly three control points and no dissection.
+                    if (ControlPoints.Count != 3 || subControlPoints.Count != 3)
+                        break;
 
-                        // Here we have exactly 3 control points. Attempt to fit a circular arc.
-                        List<Vector2> subpath = new CircularArcApproximator(subControlPoints[0], subControlPoints[1], subControlPoints[2]).CreateArc();
+                    // Here we have exactly 3 control points. Attempt to fit a circular arc.
+                    List<Vector2> subpath = new CircularArcApproximator(subControlPoints[0], subControlPoints[1], subControlPoints[2]).CreateArc();
 
-                        if (subpath.Count == 0)
-                            // For some reason a circular arc could not be fit to the 3 given points. Fall back
-                            // to a numerically stable bezier approximation.
-                            subpath = new BezierApproximator(subControlPoints).CreateBezier();
+                    // If for some reason a circular arc could not be fit to the 3 given points, fall back to a numerically stable bezier approximation.
+                    if (subpath.Count == 0)
+                        break;
 
-                        return subpath;
-                    }
-                default:
-                    return new BezierApproximator(subControlPoints).CreateBezier();
+                    return subpath;
             }
+
+            return new BezierApproximator(subControlPoints).CreateBezier();
         }
 
         private void calculatePath()
@@ -172,13 +166,16 @@ namespace osu.Game.Modes.Osu.Objects
         /// <param name="p1">End progress. Ranges from 0 (beginning of the slider) to 1 (end of the slider).</param>
         public void GetPathToProgress(List<Vector2> path, double p0, double p1)
         {
+            if (calculatedPath.Count == 0 && ControlPoints.Count > 0)
+                Calculate();
+
             double d0 = progressToDistance(p0);
             double d1 = progressToDistance(p1);
 
             path.Clear();
 
             int i = 0;
-            for (; i < calculatedPath.Count && cumulativeLength[i] < d0; ++i);
+            for (; i < calculatedPath.Count && cumulativeLength[i] < d0; ++i) ;
 
             path.Add(interpolateVertices(i, d0) + Offset);
 
@@ -196,6 +193,9 @@ namespace osu.Game.Modes.Osu.Objects
         /// <returns></returns>
         public Vector2 PositionAt(double progress)
         {
+            if (calculatedPath.Count == 0 && ControlPoints.Count > 0)
+                Calculate();
+
             double d = progressToDistance(progress);
             return interpolateVertices(indexOfDistance(d), d) + Offset;
         }

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

@@ -0,0 +1,12 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+namespace osu.Game.Modes.Osu.Objects
+{
+    public class SliderTick : OsuHitObject
+    {
+        public int RepeatIndex { get; set; }
+
+        public override HitObjectType Type => HitObjectType.SliderTick;
+    }
+}

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

@@ -5,5 +5,10 @@ namespace osu.Game.Modes.Osu.Objects
 {
     public class Spinner : OsuHitObject
     {
+        public double Length;
+
+        public override double EndTime => StartTime + Length;
+
+        public override HitObjectType Type => HitObjectType.Spinner;
     }
 }

osu.Game.Modes.Osu/OpenTK.dll.config

@@ -1,8 +1,7 @@
 <!--
-Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
 Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 -->
-
 <configuration>
   <dllmap os="linux" dll="opengl32.dll" target="libGL.so.1"/>
   <dllmap os="linux" dll="glu32.dll" target="libGLU.so.1"/>

osu.Game.Modes.Osu/OsuDifficultyCalculator.cs

@@ -0,0 +1,193 @@
+// 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.Game.Beatmaps;
+using osu.Game.Modes.Osu.Objects;
+using System;
+using System.Collections.Generic;
+using osu.Game.Modes.Objects;
+
+namespace osu.Game.Modes.Osu
+{
+    public class OsuDifficultyCalculator : DifficultyCalculator<OsuHitObject>
+    {
+        private const double star_scaling_factor = 0.0675;
+        private const double extreme_scaling_factor = 0.5;
+
+        protected override PlayMode PlayMode => PlayMode.Osu;
+
+        /// <summary>
+        /// HitObjects are stored as a member variable.
+        /// </summary>
+        internal List<OsuHitObjectDifficulty> DifficultyHitObjects = new List<OsuHitObjectDifficulty>();
+
+        public OsuDifficultyCalculator(Beatmap beatmap) : base(beatmap)
+        {
+        }
+
+        protected override HitObjectConverter<OsuHitObject> Converter => new OsuHitObjectConverter();
+
+        protected override void PreprocessHitObjects()
+        {
+            foreach (var h in Objects)
+                if (h.Type == HitObjectType.Slider)
+                    ((Slider)h).Curve.Calculate();
+        }
+
+        protected override double CalculateInternal(Dictionary<String, String> categoryDifficulty)
+        {
+            // Fill our custom DifficultyHitObject class, that carries additional information
+            DifficultyHitObjects.Clear();
+
+            foreach (var hitObject in Objects)
+                DifficultyHitObjects.Add(new OsuHitObjectDifficulty(hitObject));
+
+            // Sort DifficultyHitObjects by StartTime of the HitObjects - just to make sure.
+            DifficultyHitObjects.Sort((a, b) => a.BaseHitObject.StartTime.CompareTo(b.BaseHitObject.StartTime));
+
+            if (!CalculateStrainValues()) return 0;
+
+            double speedDifficulty = CalculateDifficulty(DifficultyType.Speed);
+            double aimDifficulty = CalculateDifficulty(DifficultyType.Aim);
+
+            // OverallDifficulty is not considered in this algorithm and neither is HpDrainRate. That means, that in this form the algorithm determines how hard it physically is
+            // to play the map, assuming, that too much of an error will not lead to a death.
+            // It might be desirable to include OverallDifficulty into map difficulty, but in my personal opinion it belongs more to the weighting of the actual peformance
+            // and is superfluous in the beatmap difficulty rating.
+            // If it were to be considered, then I would look at the hit window of normal HitCircles only, since Sliders and Spinners are (almost) "free" 300s and take map length
+            // into account as well.
+
+            // The difficulty can be scaled by any desired metric.
+            // In osu!tp it gets squared to account for the rapid increase in difficulty as the limit of a human is approached. (Of course it also gets scaled afterwards.)
+            // It would not be suitable for a star rating, therefore:
+
+            // The following is a proposal to forge a star rating from 0 to 5. It consists of taking the square root of the difficulty, since by simply scaling the easier
+            // 5-star maps would end up with one star.
+            double speedStars = Math.Sqrt(speedDifficulty) * star_scaling_factor;
+            double aimStars = Math.Sqrt(aimDifficulty) * star_scaling_factor;
+
+            if (categoryDifficulty != null)
+            {
+                categoryDifficulty.Add("Aim", aimStars.ToString("0.00"));
+                categoryDifficulty.Add("Speed", speedStars.ToString("0.00"));
+
+                double hitWindow300 = 30/*HitObjectManager.HitWindow300*/ / TimeRate;
+                double preEmpt = 450/*HitObjectManager.PreEmpt*/ / TimeRate;
+
+                categoryDifficulty.Add("OD", (-(hitWindow300 - 80.0) / 6.0).ToString("0.00"));
+                categoryDifficulty.Add("AR", (preEmpt > 1200.0 ? -(preEmpt - 1800.0) / 120.0 : -(preEmpt - 1200.0) / 150.0 + 5.0).ToString("0.00"));
+
+                int maxCombo = 0;
+                foreach (OsuHitObjectDifficulty hitObject in DifficultyHitObjects)
+                    maxCombo += hitObject.MaxCombo;
+
+                categoryDifficulty.Add("Max combo", maxCombo.ToString());
+            }
+
+            // Again, from own observations and from the general opinion of the community a map with high speed and low aim (or vice versa) difficulty is harder,
+            // than a map with mediocre difficulty in both. Therefore we can not just add both difficulties together, but will introduce a scaling that favors extremes.
+            double starRating = speedStars + aimStars + Math.Abs(speedStars - aimStars) * extreme_scaling_factor;
+            // Another approach to this would be taking Speed and Aim separately to a chosen power, which again would be equivalent. This would be more convenient if
+            // the hit window size is to be considered as well.
+
+            // Note: The star rating is tuned extremely tight! Airman (/b/104229) and Freedom Dive (/b/126645), two of the hardest ranked maps, both score ~4.66 stars.
+            // Expect the easier kind of maps that officially get 5 stars to obtain around 2 by this metric. The tutorial still scores about half a star.
+            // Tune by yourself as you please. ;)
+
+            return starRating;
+        }
+
+        protected bool CalculateStrainValues()
+        {
+            // Traverse hitObjects in pairs to calculate the strain value of NextHitObject from the strain value of CurrentHitObject and environment.
+            List<OsuHitObjectDifficulty>.Enumerator hitObjectsEnumerator = DifficultyHitObjects.GetEnumerator();
+
+            if (!hitObjectsEnumerator.MoveNext()) return false;
+
+            OsuHitObjectDifficulty currentHitObject = hitObjectsEnumerator.Current;
+            OsuHitObjectDifficulty nextHitObject;
+
+            // First hitObject starts at strain 1. 1 is the default for strain values, so we don't need to set it here. See DifficultyHitObject.
+            while (hitObjectsEnumerator.MoveNext())
+            {
+                nextHitObject = hitObjectsEnumerator.Current;
+                nextHitObject.CalculateStrains(currentHitObject, TimeRate);
+                currentHitObject = nextHitObject;
+            }
+
+            return true;
+        }
+
+        /// <summary>
+        /// In milliseconds. For difficulty calculation we will only look at the highest strain value in each time interval of size STRAIN_STEP.
+        /// This is to eliminate higher influence of stream over aim by simply having more HitObjects with high strain.
+        /// The higher this value, the less strains there will be, indirectly giving long beatmaps an advantage.
+        /// </summary>
+        protected const double STRAIN_STEP = 400;
+
+        /// <summary>
+        /// The weighting of each strain value decays to this number * it's previous value
+        /// </summary>
+        protected const double DECAY_WEIGHT = 0.9;
+
+        protected double CalculateDifficulty(DifficultyType type)
+        {
+            double actualStrainStep = STRAIN_STEP * TimeRate;
+
+            // Find the highest strain value within each strain step
+            List<double> highestStrains = new List<double>();
+            double intervalEndTime = actualStrainStep;
+            double maximumStrain = 0; // We need to keep track of the maximum strain in the current interval
+
+            OsuHitObjectDifficulty previousHitObject = null;
+            foreach (OsuHitObjectDifficulty hitObject in DifficultyHitObjects)
+            {
+                // While we are beyond the current interval push the currently available maximum to our strain list
+                while (hitObject.BaseHitObject.StartTime > intervalEndTime)
+                {
+                    highestStrains.Add(maximumStrain);
+
+                    // The maximum strain of the next interval is not zero by default! We need to take the last hitObject we encountered, take its strain and apply the decay
+                    // until the beginning of the next interval.
+                    if (previousHitObject == null)
+                    {
+                        maximumStrain = 0;
+                    }
+                    else
+                    {
+                        double decay = Math.Pow(OsuHitObjectDifficulty.DECAY_BASE[(int)type], (intervalEndTime - previousHitObject.BaseHitObject.StartTime) / 1000);
+                        maximumStrain = previousHitObject.Strains[(int)type] * decay;
+                    }
+
+                    // Go to the next time interval
+                    intervalEndTime += actualStrainStep;
+                }
+
+                // Obtain maximum strain
+                maximumStrain = Math.Max(hitObject.Strains[(int)type], maximumStrain);
+
+                previousHitObject = hitObject;
+            }
+
+            // Build the weighted sum over the highest strains for each interval
+            double difficulty = 0;
+            double weight = 1;
+            highestStrains.Sort((a, b) => b.CompareTo(a)); // Sort from highest to lowest strain.
+
+            foreach (double strain in highestStrains)
+            {
+                difficulty += weight * strain;
+                weight *= DECAY_WEIGHT;
+            }
+
+            return difficulty;
+        }
+
+        // Those values are used as array indices. Be careful when changing them!
+        public enum DifficultyType : int
+        {
+            Speed = 0,
+            Aim,
+        };
+    }
+}