From d90a33485318f926e51c6f9da270876756bfab30 Mon Sep 17 00:00:00 2001
From: Salman Ahmed <frenzibyte@gmail.com>
Date: Thu, 17 Mar 2022 03:40:15 +0300
Subject: [PATCH] Introduce multiplayer playability and free mod validity in
 `Mod`

---
 osu.Game/Rulesets/Mods/IMod.cs | 12 ++++++++++++
 osu.Game/Rulesets/Mods/Mod.cs  |  6 ++++++
 2 files changed, 18 insertions(+)

diff --git a/osu.Game/Rulesets/Mods/IMod.cs b/osu.Game/Rulesets/Mods/IMod.cs
index d5d1de91de..cda59bae55 100644
--- a/osu.Game/Rulesets/Mods/IMod.cs
+++ b/osu.Game/Rulesets/Mods/IMod.cs
@@ -39,6 +39,18 @@ namespace osu.Game.Rulesets.Mods
         /// </summary>
         bool UserPlayable { get; }
 
+        /// <summary>
+        /// Whether this mod is playable in a multiplayer match.
+        /// Should be <c>false</c> for mods that affect the gameplay progress based on user input (e.g. <see cref="ModAdaptiveSpeed"/>).
+        /// </summary>
+        bool PlayableInMultiplayer { get; }
+
+        /// <summary>
+        /// Whether this mod is valid to be a "free mod" in a multiplayer match.
+        /// Should be <c>false</c> for mods that affect the gameplay progress (e.g. <see cref="ModRateAdjust"/> and <see cref="ModTimeRamp"/>).
+        /// </summary>
+        bool ValidFreeModInMultiplayer { get; }
+
         /// <summary>
         /// Create a fresh <see cref="Mod"/> instance based on this mod.
         /// </summary>
diff --git a/osu.Game/Rulesets/Mods/Mod.cs b/osu.Game/Rulesets/Mods/Mod.cs
index b2d4be54ce..a6562b4f4c 100644
--- a/osu.Game/Rulesets/Mods/Mod.cs
+++ b/osu.Game/Rulesets/Mods/Mod.cs
@@ -94,6 +94,12 @@ namespace osu.Game.Rulesets.Mods
         [JsonIgnore]
         public virtual bool UserPlayable => true;
 
+        [JsonIgnore]
+        public virtual bool PlayableInMultiplayer => UserPlayable;
+
+        [JsonIgnore]
+        public virtual bool ValidFreeModInMultiplayer => PlayableInMultiplayer;
+
         [Obsolete("Going forward, the concept of \"ranked\" doesn't exist. The only exceptions are automation mods, which should now override and set UserPlayable to false.")] // Can be removed 20211009
         public virtual bool Ranked => false;