From 98b8227a631a3326be65072b89f1fde323505784 Mon Sep 17 00:00:00 2001
From: MrGadget1024 <9826063+MrGadget1024@users.noreply.github.com>
Date: Sun, 12 Mar 2023 09:27:43 -0400
Subject: [PATCH] fix: Add Clamp extension for pre-Unity 2021

---
 .../Core/SnapshotInterpolation/SnapshotInterpolation.cs   | 4 ++++
 Assets/Mirror/Core/Tools/Extensions.cs                    | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/Assets/Mirror/Core/SnapshotInterpolation/SnapshotInterpolation.cs b/Assets/Mirror/Core/SnapshotInterpolation/SnapshotInterpolation.cs
index d36de8b2d..36387608d 100644
--- a/Assets/Mirror/Core/SnapshotInterpolation/SnapshotInterpolation.cs
+++ b/Assets/Mirror/Core/SnapshotInterpolation/SnapshotInterpolation.cs
@@ -130,7 +130,11 @@ public static double TimelineClamp(
             // outside of the area, we clamp.
             double lowerBound = targetTime - bufferTime;
             double upperBound = targetTime + bufferTime;
+#if !UNITY_2021_OR_NEWER
+            return Extensions.Clamp(localTimeline, lowerBound, upperBound);
+#else
             return Math.Clamp(localTimeline, lowerBound, upperBound);
+#endif
         }
 
         // call this for every received snapshot.
diff --git a/Assets/Mirror/Core/Tools/Extensions.cs b/Assets/Mirror/Core/Tools/Extensions.cs
index 02407e09f..ca394e8bb 100644
--- a/Assets/Mirror/Core/Tools/Extensions.cs
+++ b/Assets/Mirror/Core/Tools/Extensions.cs
@@ -59,6 +59,14 @@ public static bool TryDequeue<T>(this Queue<T> source, out T element)
             element = default;
             return false;
         }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static T Clamp<T>(this T val, T min, T max) where T : IComparable<T>
+        {
+            if (val.CompareTo(min) < 0) return min;
+            else if (val.CompareTo(max) > 0) return max;
+            else return val;
+        }
 #endif
     }
 }