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core-dump/Scripts/GameTime.cs

@@ -0,0 +1,69 @@
+using Unity.Mathematics;
+using UnityEngine;
+
+namespace Timing
+{
+	public class GameTime : MonoBehaviour
+	{
+		private double _lastCapturedDspTime;
+		public static bool Active { get; private set; }
+		public static double StartTime { get; private set; }
+		public static double TimeSinceClipStart { get; private set; }
+
+		private static NativeLinearRegression TimePrediction { get; set; }
+
+		private void Update()
+		{
+			if (!Active) return;
+
+			#region Smoothen DSP buffer time
+
+			if (AudioSettings.dspTime > _lastCapturedDspTime)
+			{
+				TimePrediction.Sample(new double2(Time.realtimeSinceStartupAsDouble, AudioSettings.dspTime));
+				_lastCapturedDspTime = AudioSettings.dspTime;
+			}
+
+			var smoothDspTime = TimePrediction.SampleCount < 2
+				                    ? AudioSettings.dspTime
+				                    : TimePrediction.Predict(Time.realtimeSinceStartupAsDouble);
+
+			#endregion
+
+			TimeSinceClipStart = smoothDspTime - StartTime;
+		}
+
+		private void OnDestroy()
+		{
+			TimePrediction.Dispose();
+		}
+
+		/// <summary>
+		///     Tells the time manager to start counting time
+		/// </summary>
+		public static void StartFrom(double startTime)
+		{
+			StartTime = startTime;
+			TimeSinceClipStart = AudioSettings.dspTime - startTime;
+			Active = true;
+
+			TimePrediction ??= new NativeLinearRegression();
+
+			TimePrediction.Clear();
+		}
+
+		public static void Pause()
+		{
+			Active = false;
+		}
+
+		public static void UnPause(double timeSinceClipStart)
+		{
+			TimePrediction.Clear();
+			StartTime = AudioSettings.dspTime - timeSinceClipStart;
+			TimeSinceClipStart = timeSinceClipStart;
+
+			Active = true;
+		}
+	}
+}