sbox-public/engine/Sandbox.Engine/Utility/Time.cs

using NativeEngine;
using Sandbox.Utility;

namespace Sandbox;

public class Time
{
	/// <summary>
	/// The time since the game startup.
	/// </summary>
	public static float Now { get; set; }

	/// <summary>
	/// The delta between the last frame and the current (for all intents and purposes).
	/// </summary>
	public static float Delta { get; set; }

	/// <summary>
	/// The time since the game startup as a double.
	/// </summary>
	public static double NowDouble { get; set; }

	// Audio.Time , Audio.TimeDelta - if these are needed

	//public static double Sound => g_pSoundSystem.AudioStateHostTime();
	//public static double SoundDelta => g_pSoundSystem.AudioStateFrameTime();

	internal static void Update( double now, double delta )
	{
		Now = (float)now;
		Delta = (float)delta;
		NowDouble = now;

		SyncSceneSystemTime();
	}

	public static IDisposable Scope( double now, double delta )
	{
		var dn = NowDouble;
		var d = Delta;
		var n = Now;

		Update( now, delta );

		return DisposeAction.Create( () =>
		{
			NowDouble = dn;
			Delta = d;
			Now = n;

			SyncSceneSystemTime();
		} );
	}

	private static void SyncSceneSystemTime()
	{
		if ( Application.IsUnitTest ) return;

		// Sync g_flTime in shaders
		CSceneSystem.SetNextRenderTime( Now );
	}
}