/// <summary>
/// Unity's FixedUpdate method
/// Handles prediction, server processing, reconciliation
/// & FixedUpdate of state
/// </summary>
void FixedUpdate()
{
// Don't start until initialization is done, stop updating if the input is lost
if (!_networkReady)
{
return;
}
if (!_initialized && !Initialize())
{
return;
}
if ((networkObject.IsServer || _isLocalOwner) && _inputListener == null)
{
return;
}
#region Netcode Logic
// Server Authority - snap the position on all clients to the server's position
if (!networkObject.IsServer)
{
_rigidBody.position = networkObject.position;
if (_isLocalOwner && networkObject.frame != 0 && _lastNetworkFrame <= networkObject.frame)
{
_lastNetworkFrame = networkObject.frame;
Reconcile();
}
}
if (!_isLocalOwner && !networkObject.IsServer)
{
return;
}
// Local client prediction & server authoritative logic
if (_inputListener.FramesToPlay.Count <= 0)
{
return;
}
_currentInput = _inputListener.FramesToPlay.Pop();
_lastLocalFrame = _currentInput.frameNumber;
// Try to do a player update (if this fails, something's weird)
try
{
PlayerUpdate(_currentInput);
}
catch (Exception e)
{
Debug.LogError("Malformed input frame.");
Debug.LogError(e);
}
// Reconciliation only happens on the local client
if (_isLocalOwner && !networkObject.IsServer)
{
_inputListener.FramesToReconcile.Add(_currentInput);
}
#endregion
}
private void Update()
{
/*
* Poll the input in Update
*
* I've heard some discussions about this vs polling in
* FixedUpdate on the Forge Networking Discord
*
* From what I can tell it is an opinionated choice
* and there's no benefit/problem one way or the other,
* although theoretically you are one input behind in
* Update since FixedUpdate runs before Update per:
* https://docs.unity3d.com/Manual/ExecutionOrder.html
*/
_lastInputFrame = _inputFrame;
_inputFrame = new InputFrame()
{
right = Input.GetKey(KeyCode.L) || Input.GetKey(KeyCode.RightArrow),
down = Input.GetKey(KeyCode.K) || Input.GetKey(KeyCode.DownArrow),
left = Input.GetKey(KeyCode.J) || Input.GetKey(KeyCode.LeftArrow),
up = Input.GetKey(KeyCode.I) || Input.GetKey(KeyCode.UpArrow),
horizontal = Input.GetAxisRaw("Horizontal"),
vertical = Input.GetAxisRaw("Vertical")
};
}
private void MoveTank(InputFrame input)
{
// Create a vector in the direction the tank is facing with a magnitude based on the input, speed and the time between frames.
Vector3 movement = transform.forward * input.vertical * 5 * Time.deltaTime;
// Apply this movement to the rigidbody's position.
_rigidBody.MovePosition(_rigidBody.position + movement);
}
/// <summary>
/// Move the player's simulation (rigid body)
/// </summary>
/// <param name="input"></param>
private void Move(InputFrame input)
{
// Move the player, clamping the movement so diagonals aren't faster
Vector2 translation =
Vector2.ClampMagnitude(new Vector2(input.horizontal, input.vertical) * Speed * Time.fixedDeltaTime, Speed);
_rigidBody.position += translation;
_rigidBody.velocity = translation;
}
/// <summary>
/// Send input state to the server for processing
/// </summary>
/// <param name="args"></param>
public override void SyncInputs(RpcArgs args)
{
if (networkObject.IsServer)
{
var bytes = args.GetNext <Byte[]>();
InputFrame newest = (InputFrame)ByteArray.Deserialize(bytes);
FramesToPlay.Add(newest);
}
}
private void PlayerUpdate(InputFrame input)
{
// Set the velocity to zero, move the player based on the next input, then detect & resolve collisions
_rigidBody.velocity = Vector2.zero;
if (input != null && input.HasInput)
{
Move(input);
}
PhysicsCollisions();
}
private void TurnTank(InputFrame input)
{
// Determine the number of degrees to be turned based on the input, speed and time between frames.
float turn = input.horizontal * 40 * Time.deltaTime;
// Make this into a rotation in the y axis.
Quaternion turnRotation = Quaternion.Euler(0f, turn, 0f);
// Apply this rotation to the rigidbody's rotation.
_rigidBody.MoveRotation(_rigidBody.rotation * turnRotation);
}
/// <summary>
/// Player update composed of movement and collision processing
/// </summary>
/// <param name="input"></param>
private void PlayerUpdate(InputFrame input)
{
// Set the velocity to zero, move the player based on the next input, then detect & resolve collisions
_rigidBody.velocity = Vector3.zero; // DKE Changed Vector2 to Vector3
if (input != null && input.HasInput)
{
//Debug.Log("PlayerUpdate has input");
//Move(input); // DKE: removed
MoveTank(input); // DKE: Replaced Move by MoveTank + TurnTank
TurnTank(input); // DKE: added
PhysicsCollisions();
}
}
// RPC for receiving InputFrames from the clients
public override void SyncInputs(RpcArgs args)
{
if (networkObject.IsServer)
{
var bytes = args.GetNext <Byte[]>();
if (sendSingleInputs)
{
InputFrame nextInputFrame = (InputFrame)ByteArrayUtilities.ByteArrayToObject(bytes);
FramesToPlay.Add(nextInputFrame);
}
else
{
List <InputFrame> networkInputFrames = (List <InputFrame>)ByteArrayUtilities.ByteArrayToObject(bytes);
FramesToPlay.AddRange(networkInputFrames);
}
}
}
/// <summary>
/// Reconcile inputs that haven't yet been
/// authoritatively processed by the server
/// </summary>
private void Reconcile()
{
// Remove any inputs up to and including the last input processed by the server
_inputListener.FramesToReconcile.RemoveAll(f => f.frameNumber < networkObject.frame);
// Replay them all back to the last input processed by client prediction
if (_inputListener.FramesToReconcile.Count > 0)
{
for (Int32 i = 0; i < _inputListener.FramesToReconcile.Count; ++i)
{
_currentInput = _inputListener.FramesToReconcile[i];
PlayerUpdate(_currentInput);
}
}
// The error vector measures the difference between the predicted & server updated sim position (this one)
// and the view position (the position of the MonoBehavior holding your renderer/view)
_errorVector = _rigidBody.position - (Vector2)View.transform.position;
_errorTimer = 0.0f;
}
/// <summary>
/// Polling of inputs is handled in Update since they
/// reset every frame making weird things happen in FixedUpdate
/// </summary>
private void Update()
{
if (!_networkReady)
{
return;
}
if (!networkObject.IsServer && networkObject.IsOwner)
{
_inputFrame = new InputFrame
{
right = Input.GetKey(KeyCode.L) || Input.GetKey(KeyCode.RightArrow),
down = Input.GetKey(KeyCode.K) || Input.GetKey(KeyCode.DownArrow),
left = Input.GetKey(KeyCode.J) || Input.GetKey(KeyCode.LeftArrow),
up = Input.GetKey(KeyCode.I) || Input.GetKey(KeyCode.UpArrow),
horizontal = Input.GetAxisRaw("Horizontal"),
vertical = Input.GetAxisRaw("Vertical")
};
}
}
void FixedUpdate()
{
// Check if this client is the local owner
_isLocalOwner = networkObject.MyPlayerId == networkObject.ownerNetId;
#region Setup
// Initial setup - only do this once
if ((_isLocalOwner || networkObject.IsServer) && !_setup)
{
// Interpolation on the predicted client and server does weird things
// Only interpolate on non-owner clients
networkObject.positionInterpolation.Enabled = false;
_setup = true;
}
// Get the input listener if it doesn't exist and this isn't a remote client
if (_inputListener == null)
{
_inputListener = FindObjectsOfType <InputListener>().FirstOrDefault(x => x.networkObject.Owner.NetworkId == networkObject.ownerNetId);
}
#endregion
#region Netcode Logic
// Server Authority - snap the position on all clients to the server's position
if (!networkObject.IsServer)
{
_rigidBody.position = networkObject.position;
}
// Client owner Reconciliation & Prediction
if (_isLocalOwner)
{
if (_inputListener != null)
{
// Reconciliation - only do this if the server update is current or new
if (networkObject.frame != 0 && _lastNetworkFrame <= networkObject.frame)
{
_lastNetworkFrame = networkObject.frame;
Reconcile();
}
// Prediction
if (_inputListener.FramesToPlay.Count > 0)
{
InputFrame input = _inputListener.FramesToPlay[0];
_lastLocalFrame = input.frameNumber;
PlayerUpdate(input);
_inputListener.FramesToPlay.RemoveAt(0);
}
}
}
// Server Processing
else if (networkObject.IsServer)
{
// Reset the current input - we don't want to re-use it if there no inputs in the queue
_currentInput = null;
if (_inputListener != null)
{
// Process all available inputs each frame
while (_inputListener.FramesToPlay.Count > 0)
{
_currentInput = _inputListener.FramesToPlay[0];
_lastLocalFrame = _currentInput.frameNumber;
_inputListener.FramesToPlay.RemoveAt(0);
// Try-catch is a good idea to handle weird serialization/deserialization errors
try
{
PlayerUpdate(_currentInput);
}
catch (Exception e)
{
Debug.LogError(e + " (Serverside input processing - Player.cs line 104)");
}
}
}
}
#endregion
}
private void Move(InputFrame input)
{
_rigidBody.velocity = new Vector2(input.horizontal, input.vertical) * Speed * Time.fixedDeltaTime;
_rigidBody.position += _rigidBody.velocity;
}