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Assets/Scripts/Game/Base/ProjectFiles/BeatmapContainer.cs

@@ -32,6 +32,47 @@ namespace Ichni.RhythmGame
             }
         }
 
+        /// <summary>
+        /// Rebuilds the list of elements whose active state is driven by a finite time duration.
+        /// This preserves the existing runtime filter, while avoiding a LINQ allocation during
+        /// every project load.
+        /// </summary>
+        public void RebuildRuntimeTimeDurations()
+        {
+            List<TimeDurationSubmodule> runtimeTimeDurations = GameManager.Instance.timeDurations;
+            runtimeTimeDurations.Clear();
+
+            float songLength = GameManager.Instance.songInformation.songLength;
+            for (int i = 0; i < gameElementList.Count; i++)
+            {
+                if (gameElementList[i] is not IHaveTimeDurationSubmodule timeDurationHost)
+                {
+                    continue;
+                }
+
+                TimeDurationSubmodule timeDuration = timeDurationHost.timeDurationSubmodule;
+                if (timeDuration != null &&
+                    (timeDuration.startTime > 0f || timeDuration.endTime < songLength))
+                {
+                    runtimeTimeDurations.Add(timeDuration);
+                }
+            }
+        }
+
+        /// <summary>
+        /// Immediately applies the active state for the registered time-duration elements.
+        /// Used at loading-state boundaries so the first rendered frame already matches the
+        /// current song timeline.
+        /// </summary>
+        public void SyncRuntimeTimeDurationStates(float songTime)
+        {
+            List<TimeDurationSubmodule> runtimeTimeDurations = GameManager.Instance.timeDurations;
+            for (int i = 0; i < runtimeTimeDurations.Count; i++)
+            {
+                runtimeTimeDurations[i]?.DetectAndSwitchActiveState(songTime);
+            }
+        }
+
         public void SetUpInspector()
         {
             throw new System.NotImplementedException();
@@ -43,4 +84,4 @@ namespace Ichni.RhythmGame
         }
     }
 
-}
+}