demo recording stuff p2

Source/Game/PlayerInputDemo.cs

@@ -0,0 +1,92 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Net;
+using System.Runtime.InteropServices;
+using FlaxEngine;
+using Console = Cabrito.Console;
+
+namespace Game
+{
+	public class PlayerInputDemo : PlayerInput
+	{
+		protected List<PlayerInputState> buffer = new List<PlayerInputState>();
+		protected IEnumerator<PlayerInputState> bufferEnumerable;
+
+		public PlayerInputDemo(string demoPath)
+		{
+			Console.Print("demo?");
+			if (!File.Exists(demoPath))
+				return;
+
+			var expectedPlayerInputStateSize = Marshal.SizeOf(typeof(PlayerInputState));
+
+			var stream = File.OpenRead(demoPath);
+			var ver = (int)stream.ReadByte();
+			var inputStateSize = (int)stream.ReadByte();
+			if (ver != DemoVer && inputStateSize != expectedPlayerInputStateSize)
+			{
+				Console.Print("demover mismatch: version " + ver + " != " + DemoVer + ", inputStateSize " + inputStateSize + " != " + Marshal.SizeOf(typeof(PlayerInputState)));
+				stream.Close();
+				return;
+			}
+
+			T RawDeserialize<T>(byte[] rawData, int position)
+			{
+				int rawsize = Marshal.SizeOf(typeof(T));
+				if (rawsize > rawData.Length - position)
+					throw new ArgumentException("Not enough data to fill struct. Array length from position: "+(rawData.Length-position) + ", Struct length: "+rawsize);
+				IntPtr buffer = Marshal.AllocHGlobal(rawsize);
+				Marshal.Copy(rawData, position, buffer, rawsize);
+				T retobj = (T)Marshal.PtrToStructure(buffer, typeof(T));
+				Marshal.FreeHGlobal(buffer);
+				return retobj;
+			}
+
+			while (true)
+			{
+				byte[] b = new byte[expectedPlayerInputStateSize];
+				var readBytes = stream.Read(b, 0, b.Length);
+				if (readBytes < expectedPlayerInputStateSize)
+					break;
+
+				buffer.Add(RawDeserialize<PlayerInputState>(b, 0));
+			}
+
+			bufferEnumerable = buffer.GetEnumerator();
+
+			Console.Print("demo numstates: " + buffer.Count);
+		}
+
+		public override void OnUpdate()
+		{
+			lastState = currentState;
+		}
+
+		public override void OnFixedUpdate()
+		{
+		}
+
+		public override void OnEndFrame()
+		{
+			// TODO: check if the current state frame matches the current frame number before advancing
+
+			if (bufferEnumerable == null || !bufferEnumerable.MoveNext())
+			{
+				if (buffer.Any())
+				{
+					bufferEnumerable.Dispose();
+					bufferEnumerable = null;
+					buffer.Clear();
+					Console.Print("Demo ended");
+				}
+				return;
+			}
+
+			//var actorState = currentState.actor;
+			currentState.input = bufferEnumerable.Current;
+			//currentState.actor = actorState;
+		}
+	}
+}