app/Game/Channel/Control/PlayerController.js

@@ -11,6 +11,7 @@ function(Parent, nc, Parser) {
     function PlayerController(player) {
 
     	Parent.call(this, player);
+        this._lastProcessedSeq = 0;
     }
 
     PlayerController.prototype = Object.create(Parent.prototype);
@@ -29,7 +30,14 @@ function(Parent, nc, Parser) {
         }
 
         for (var command in message) {
-            this[command].call(this, message[command]);
+            var commandOptions = message[command];
+
+            // Track sequence number from client input commands
+            if (commandOptions && typeof commandOptions === 'object' && commandOptions._seq !== undefined) {
+                this._lastProcessedSeq = commandOptions._seq;
+            }
+
+            this[command].call(this, commandOptions);
         }
     };
 

app/Game/Channel/GameController.js

@@ -120,6 +120,23 @@ function (Parent, PhysicsEngine, Settings, requestAnimFrame, nc, Box2D, Player,
             nc.trigger(nc.ns.channel.to.client.gameCommand.broadcast, "worldUpdate", update);
         }
 
+        // Send per-user input acknowledgments for server reconciliation
+        for (var id in this.players) {
+            var player = this.players[id];
+            if (player.isSpawned() && player.playerController._lastProcessedSeq > 0) {
+                var body = player.doll.body;
+                nc.trigger(
+                    nc.ns.channel.to.client.user.gameCommand.send + id,
+                    "inputAck",
+                    {
+                        seq: player.playerController._lastProcessedSeq,
+                        p: { x: body.GetPosition().x, y: body.GetPosition().y },
+                        lv: { x: body.GetLinearVelocity().x, y: body.GetLinearVelocity().y }
+                    }
+                );
+            }
+        }
+
         this.worldUpdateTimeout = setTimeout(this.updateWorld.bind(this), Settings.NETWORK_UPDATE_INTERVAL);
     };
 

app/Game/Client/Control/PlayerController.js

@@ -14,6 +14,7 @@ function (Parent, nc, KeyboardAndMouse, Gamepad, pointerLockManager) {
 
         Parent.call(this, me);
 
+        this._inputSeq = 0;
         this.keyboardAndMouse = new KeyboardAndMouse(this);
         this.gamepad = new Gamepad(this);
     }
@@ -26,34 +27,48 @@ function (Parent, nc, KeyboardAndMouse, Gamepad, pointerLockManager) {
         this.gamepad.update();
     };
 
+    PlayerController.prototype._recordAndSend = function(command) {
+        this._inputSeq++;
+        if (this.player.doll && this.player.doll.body) {
+            var vel = this.player.doll.body.GetLinearVelocity();
+            this.player.inputBuffer.add({
+                seq: this._inputSeq,
+                timestamp: Date.now(),
+                vx: vel.x,
+                vy: vel.y
+            });
+        }
+        nc.trigger(nc.ns.client.to.server.gameCommand.send, command, {_seq: this._inputSeq});
+    };
+
     PlayerController.prototype.moveLeft = function () {
         if (!this.isPlayerInputAllowed()) return;
         Parent.prototype.moveLeft.call(this);
-        nc.trigger(nc.ns.client.to.server.gameCommand.send, 'moveLeft');
+        this._recordAndSend('moveLeft');
     }
 
     PlayerController.prototype.moveRight = function () {
         if (!this.isPlayerInputAllowed()) return;
         Parent.prototype.moveRight.call(this);
-        nc.trigger(nc.ns.client.to.server.gameCommand.send, 'moveRight');
+        this._recordAndSend('moveRight');
     }
 
     // always allow to stop, to prevent endless running
     PlayerController.prototype.stop = function () {
         Parent.prototype.stop.call(this);
-        nc.trigger(nc.ns.client.to.server.gameCommand.send, 'stop');
+        this._recordAndSend('stop');
     }
 
     PlayerController.prototype.jump = function () {
         if (!this.isPlayerInputAllowed()) return;
         Parent.prototype.jump.call(this);
-        nc.trigger(nc.ns.client.to.server.gameCommand.send, 'jump');
+        this._recordAndSend('jump');
     }
 
     // always allow to stop.
     PlayerController.prototype.jumpStop = function () {
         Parent.prototype.jumpStop.call(this);
-        nc.trigger(nc.ns.client.to.server.gameCommand.send, 'jumpStop');
+        this._recordAndSend('jumpStop');
     }
 
     PlayerController.prototype.setXY = function(x, y) {

app/Game/Client/GameController.js

@@ -60,6 +60,35 @@ function (Parent, Box2D, PhysicsEngine, ViewManager, PlayerController, nc, reque
         domController.fpsStep();
     };
 
+    GameController.prototype.onInputAck = function(ackData) {
+        if (!this.me || !this.me.doll) return;
+
+        this.me.inputBuffer.acknowledgeUpTo(ackData.seq);
+
+        var currentPos = this.me.doll.body.GetPosition();
+        var diffX = Math.abs(ackData.p.x - currentPos.x);
+        var diffY = Math.abs(ackData.p.y - currentPos.y);
+
+        // Scale the acceptable drift by how many inputs the server
+        // hasn't processed yet. More unacked time = more expected drift.
+        var unacked = this.me.inputBuffer.getUnacknowledged();
+        var expectedDrift = 0;
+        if (unacked.length > 0) {
+            var unackedTime = (Date.now() - unacked[0].timestamp) / 1000;
+            expectedDrift = unackedTime * Settings.RUN_SPEED;
+        }
+
+        var threshold = Settings.RECONCILIATION_THRESHOLD + expectedDrift;
+
+        // Only correct when the error exceeds what latency can explain —
+        // meaning something unexpected happened (collision, being hit, etc.)
+        if (diffX > threshold || diffY > threshold) {
+            this.me.applyReconciliation(
+                ackData.p.x, ackData.p.y,
+                ackData.lv.x, ackData.lv.y
+            );
+        }
+    };
 
     GameController.prototype.onClientReadyResponse = function(options) {
         var i;
@@ -102,6 +131,7 @@ function (Parent, Box2D, PhysicsEngine, ViewManager, PlayerController, nc, reque
 
     };
 
+    // Own doll position is handled by onInputAck reconciliation, not worldUpdate
     GameController.prototype.updateGameObject = function (gameObject, gameObjectUpdate) {
         if (gameObject === this.me.doll) {
             return;
@@ -135,6 +165,10 @@ function (Parent, Box2D, PhysicsEngine, ViewManager, PlayerController, nc, reque
         var player = this.players[playerId];
         player.spawn(x, y);
 
+        if (player === this.me) {
+            this.me.inputBuffer.clear();
+        }
+
         if(options.holdingItemUid) {
             this.onHandActionResponse({
                 itemUid: options.holdingItemUid,
@@ -190,6 +224,10 @@ function (Parent, Box2D, PhysicsEngine, ViewManager, PlayerController, nc, reque
         var killedByPlayer = this.players[options.killedByPlayerId];
         player.kill(killedByPlayer, options.ragDollId);
 
+        if (player === this.me) {
+            this.me.inputBuffer.clear();
+        }
+
         nc.trigger(nc.ns.client.view.gameStats.kill, {
             victim: {
                 name: player.user.options.nickname,
@@ -221,6 +259,7 @@ function (Parent, Box2D, PhysicsEngine, ViewManager, PlayerController, nc, reque
 
     GameController.prototype.endRound = function() {
         this.me.setInBetweenRounds(true);
+        this.me.inputBuffer.clear();
         this.toggleGameStats(true);
     };
 

app/Game/Client/GameObjects/Item.js

@@ -20,29 +20,6 @@ function (Parent, Settings, nc, Layer) {
 
     Item.prototype = Object.create(Parent.prototype);
  
-    Item.prototype.setUpdateData = function(update) {
-        var currentPos = this.body.GetPosition();
-        var diffX = update.p.x - currentPos.x;
-        var diffY = update.p.y - currentPos.y;
-        var distance = Math.sqrt(diffX * diffX + diffY * diffY);
-        var speed = Math.sqrt(update.lv.x * update.lv.x + update.lv.y * update.lv.y);
-
-        this.body.SetAwake(true);
-
-        if (distance > 3 || speed < 0.5) {
-            // Stationary: sync so grab sensor contact is accurate.
-            // Large error: snap for respawn/warp/grab events.
-            this.body.SetPosition(update.p);
-            this.body.SetAngle(update.a);
-            this.body.SetLinearVelocity(update.lv);
-            this.body.SetAngularVelocity(update.av);
-        }
-        // In-flight: skip correction entirely. Client and server both run the
-        // same Box2D physics from the same throw impulse, so they stay close
-        // without per-update snapping. Applying the server's stale state would
-        // snap the item back to where it was 125 ms ago.
-    };
-
     Item.prototype.createMesh = function() {
     	var self = this;
 

app/Game/Client/InputBuffer.js

@@ -0,0 +1,37 @@
+define([
+],
+
+function () {
+
+    "use strict";
+
+    var MAX_BUFFER_SIZE = 300;
+
+    function InputBuffer() {
+        this._buffer = [];
+    }
+
+    InputBuffer.prototype.add = function(entry) {
+        this._buffer.push(entry);
+        if (this._buffer.length > MAX_BUFFER_SIZE) {
+            this._buffer.shift();
+        }
+    };
+
+    InputBuffer.prototype.acknowledgeUpTo = function(seq) {
+        while (this._buffer.length > 0 && this._buffer[0].seq <= seq) {
+            this._buffer.shift();
+        }
+    };
+
+    InputBuffer.prototype.getUnacknowledged = function() {
+        return this._buffer;
+    };
+
+    InputBuffer.prototype.clear = function() {
+        this._buffer = [];
+    };
+
+    return InputBuffer;
+
+});

app/Game/Client/Me.js

@@ -4,9 +4,10 @@ define([
     "Lib/Utilities/NotificationCenter",
     "Lib/Utilities/Assert",
     "Game/Client/Control/PlayerController",
+    "Game/Client/InputBuffer",
 ],
 
-function (Parent, Settings, nc, Assert, PlayerController) {
+function (Parent, Settings, nc, Assert, PlayerController, InputBuffer) {
 
 	"use strict";
  
@@ -19,6 +20,8 @@ function (Parent, Settings, nc, Assert, PlayerController) {
             y: 0
         };
 
+        this.inputBuffer = new InputBuffer();
+
         this.arrowMesh = null;
         this.createAndAddArrow();
         this.playerController = new PlayerController(this);
@@ -42,6 +45,27 @@ function (Parent, Settings, nc, Assert, PlayerController) {
         };
     };
  
+    Me.prototype.applyReconciliation = function(x, y, vx, vy) {
+        var currentPos = this.doll.body.GetPosition();
+        var diffX = x - currentPos.x;
+        var diffY = y - currentPos.y;
+        var distance = Math.sqrt(diffX * diffX + diffY * diffY);
+
+        if (distance > Settings.RECONCILIATION_SNAP_THRESHOLD) {
+            // Large error — snap immediately (server-side teleport, respawn, etc.)
+            this.doll.body.SetPosition({x: x, y: y});
+        } else {
+            // Small error — blend toward reconciled position
+            var factor = Settings.RECONCILIATION_BLEND_FACTOR;
+            this.doll.body.SetPosition({
+                x: currentPos.x + diffX * factor,
+                y: currentPos.y + diffY * factor
+            });
+        }
+
+        this.doll.body.SetLinearVelocity({x: vx, y: vy});
+    };
+
     Me.prototype.createAndAddArrow = function() {
         var self = this;
 

app/Game/Config/Settings.js

@@ -95,6 +95,10 @@ function () {
         CHANNEL_DEFAULT_LEVELS: ["debug"],
         CHANNEL_RECORD_SESSION: false,
 
+        // RECONCILIATION
+        RECONCILIATION_THRESHOLD: 1,
+        RECONCILIATION_SNAP_THRESHOLD: 5.0,
+        RECONCILIATION_BLEND_FACTOR: 0.2
     };
 
     Settings.TILE_RATIO = Settings.ORIGINAL_TILE_SIZE / Settings.TILE_SIZE;

package-lock.json

@@ -49,15 +49,6 @@
         "undici-types": "~7.8.0"
       }
     },
-    "node_modules/@types/ws": {
-      "version": "8.18.1",
-      "resolved": "https://registry.npmjs.org/@types/ws/-/ws-8.18.1.tgz",
-      "integrity": "sha512-ThVF6DCVhA8kUGy+aazFQ4kXQ7E1Ty7A3ypFOe0IcJV8O/M511G99AW24irKrW56Wt44yG9+ij8FaqoBGkuBXg==",
-      "license": "MIT",
-      "dependencies": {
-        "@types/node": "*"
-      }
-    },
     "node_modules/accepts": {
       "version": "1.3.8",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-1.3.8.tgz",
@@ -146,64 +137,33 @@
       }
     },
     "node_modules/body-parser": {
-      "version": "1.20.5",
-      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.5.tgz",
-      "integrity": "sha512-3grm+/2tUOvu2cjJkvsIxrv/wVpfXQW4PsQHYm7yk4vfpu7Ekl6nEsYBoJUL6qDwZUx8wUhQ8tR2qz+ad9c9OA==",
-      "license": "MIT",
+      "version": "1.20.3",
+      "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-1.20.3.tgz",
+      "integrity": "sha512-7rAxByjUMqQ3/bHJy7D6OGXvx/MMc4IqBn/X0fcM1QUcAItpZrBEYhWGem+tzXH90c+G01ypMcYJBO9Y30203g==",
       "dependencies": {
-        "bytes": "~3.1.2",
+        "bytes": "3.1.2",
         "content-type": "~1.0.5",
         "debug": "2.6.9",
         "depd": "2.0.0",
-        "destroy": "~1.2.0",
-        "http-errors": "~2.0.1",
-        "iconv-lite": "~0.4.24",
-        "on-finished": "~2.4.1",
-        "qs": "~6.15.1",
-        "raw-body": "~2.5.3",
+        "destroy": "1.2.0",
+        "http-errors": "2.0.0",
+        "iconv-lite": "0.4.24",
+        "on-finished": "2.4.1",
+        "qs": "6.13.0",
+        "raw-body": "2.5.2",
         "type-is": "~1.6.18",
-        "unpipe": "~1.0.0"
+        "unpipe": "1.0.0"
       },
       "engines": {
         "node": ">= 0.8",
         "npm": "1.2.8000 || >= 1.4.16"
       }
     },
-    "node_modules/body-parser/node_modules/http-errors": {
-      "version": "2.0.1",
-      "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-2.0.1.tgz",
-      "integrity": "sha512-4FbRdAX+bSdmo4AUFuS0WNiPz8NgFt+r8ThgNWmlrjQjt1Q7ZR9+zTlce2859x4KSXrwIsaeTqDoKQmtP8pLmQ==",
-      "license": "MIT",
-      "dependencies": {
-        "depd": "~2.0.0",
-        "inherits": "~2.0.4",
-        "setprototypeof": "~1.2.0",
-        "statuses": "~2.0.2",
-        "toidentifier": "~1.0.1"
-      },
-      "engines": {
-        "node": ">= 0.8"
-      },
-      "funding": {
-        "type": "opencollective",
-        "url": "https://opencollective.com/express"
-      }
-    },
-    "node_modules/body-parser/node_modules/statuses": {
-      "version": "2.0.2",
-      "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
-      "integrity": "sha512-DvEy55V3DB7uknRo+4iOGT5fP1slR8wQohVdknigZPMpMstaKJQWhwiYBACJE3Ul2pTnATihhBYnRhZQHGBiRw==",
-      "license": "MIT",
-      "engines": {
-        "node": ">= 0.8"
-      }
-    },
     "node_modules/brace-expansion": {
-      "version": "1.1.15",
-      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.15.tgz",
-      "integrity": "sha512-EwOCDEex4quD37XhqM3omwtMoJjr//isUZz1JopUNWms+4Z2ViyM/k1YIRePpoVNnQhENnxtFjLaxNHrT7xIUg==",
+      "version": "1.1.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
+      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
       "dev": true,
-      "license": "MIT",
       "dependencies": {
         "balanced-match": "^1.0.0",
         "concat-map": "0.0.1"
@@ -249,7 +209,6 @@
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
       "integrity": "sha512-/Nf7TyzTx6S3yRJObOAV7956r8cr2+Oj8AC5dt8wSP3BQAoeX58NoHyCU8P8zGkNXStjTSi6fzO6F0pBdcYbEg==",
-      "license": "MIT",
       "engines": {
         "node": ">= 0.8"
       }
@@ -258,7 +217,6 @@
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
       "integrity": "sha512-Sp1ablJ0ivDkSzjcaJdxEunN5/XvksFJ2sMBFfq6x0ryhQV/2b/KwFe21cMpmHtPOSij8K99/wSfoEuTObmuMQ==",
-      "license": "MIT",
       "dependencies": {
         "es-errors": "^1.3.0",
         "function-bind": "^1.1.2"
@@ -271,7 +229,6 @@
       "version": "1.0.4",
       "resolved": "https://registry.npmjs.org/call-bound/-/call-bound-1.0.4.tgz",
       "integrity": "sha512-+ys997U96po4Kx/ABpBCqhA9EuxJaQWDQg7295H4hBphv3IZg0boBKuwYpt4YXp6MZ5AmZQnU/tyMTlRpaSejg==",
-      "license": "MIT",
       "dependencies": {
         "call-bind-apply-helpers": "^1.0.2",
         "get-intrinsic": "^1.3.0"
@@ -345,7 +302,6 @@
       "version": "1.0.5",
       "resolved": "https://registry.npmjs.org/content-type/-/content-type-1.0.5.tgz",
       "integrity": "sha512-nTjqfcBFEipKdXCv4YDQWCfmcLZKm81ldF0pAopTvyrFGVbcR6P/VAAd5G7N+0tTr8QqiU0tFadD6FK4NtJwOA==",
-      "license": "MIT",
       "engines": {
         "node": ">= 0.6"
       }
@@ -437,7 +393,6 @@
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/dunder-proto/-/dunder-proto-1.0.1.tgz",
       "integrity": "sha512-KIN/nDJBQRcXw0MLVhZE9iQHmG68qAVIBg9CqmUYjmQIhgij9U5MFvrqkUL5FbtyyzZuOeOt0zdeRe4UY7ct+A==",
-      "license": "MIT",
       "dependencies": {
         "call-bind-apply-helpers": "^1.0.1",
         "es-errors": "^1.3.0",
@@ -470,21 +425,19 @@
       }
     },
     "node_modules/engine.io": {
-      "version": "6.6.8",
-      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.6.8.tgz",
-      "integrity": "sha512-2agL3ueZhqxoVrfmntO8yuVj+uNSlIOnhykYHk3Cq0ShYPdUjjUiSJrQvXjq01I9jAuI0Zl2YO8Evv5Mqytm5g==",
-      "license": "MIT",
+      "version": "6.6.4",
+      "resolved": "https://registry.npmjs.org/engine.io/-/engine.io-6.6.4.tgz",
+      "integrity": "sha512-ZCkIjSYNDyGn0R6ewHDtXgns/Zre/NT6Agvq1/WobF7JXgFff4SeDroKiCO3fNJreU9YG429Sc81o4w5ok/W5g==",
       "dependencies": {
         "@types/cors": "^2.8.12",
         "@types/node": ">=10.0.0",
-        "@types/ws": "^8.5.12",
         "accepts": "~1.3.4",
         "base64id": "2.0.0",
         "cookie": "~0.7.2",
         "cors": "~2.8.5",
-        "debug": "~4.4.1",
+        "debug": "~4.3.1",
         "engine.io-parser": "~5.2.1",
-        "ws": "~8.20.1"
+        "ws": "~8.17.1"
       },
       "engines": {
         "node": ">=10.2.0"
@@ -507,10 +460,9 @@
       }
     },
     "node_modules/engine.io/node_modules/debug": {
-      "version": "4.4.3",
-      "resolved": "https://registry.npmjs.org/debug/-/debug-4.4.3.tgz",
-      "integrity": "sha512-RGwwWnwQvkVfavKVt22FGLw+xYSdzARwm0ru6DhTVA3umU5hZc28V3kO4stgYryrTlLpuvgI9GiijltAjNbcqA==",
-      "license": "MIT",
+      "version": "4.3.7",
+      "resolved": "https://registry.npmjs.org/debug/-/debug-4.3.7.tgz",
+      "integrity": "sha512-Er2nc/H7RrMXZBFCEim6TCmMk02Z8vLC2Rbi1KEBggpo0fS6l0S1nnapwmIi3yW/+GOJap1Krg4w0Hg80oCqgQ==",
       "dependencies": {
         "ms": "^2.1.3"
       },
@@ -526,14 +478,12 @@
     "node_modules/engine.io/node_modules/ms": {
       "version": "2.1.3",
       "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.3.tgz",
-      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA==",
-      "license": "MIT"
+      "integrity": "sha512-6FlzubTLZG3J2a/NVCAleEhjzq5oxgHyaCU9yYXvcLsvoVaHJq/s5xXI6/XXP6tz7R9xAOtHnSO/tXtF3WRTlA=="
     },
     "node_modules/es-define-property": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/es-define-property/-/es-define-property-1.0.1.tgz",
       "integrity": "sha512-e3nRfgfUZ4rNGL232gUgX06QNyyez04KdjFrF+LTRoOXmrOgFKDg4BCdsjW8EnT69eqdYGmRpJwiPVYNrCaW3g==",
-      "license": "MIT",
       "engines": {
         "node": ">= 0.4"
       }
@@ -542,16 +492,14 @@
       "version": "1.3.0",
       "resolved": "https://registry.npmjs.org/es-errors/-/es-errors-1.3.0.tgz",
       "integrity": "sha512-Zf5H2Kxt2xjTvbJvP2ZWLEICxA6j+hAmMzIlypy4xcBg1vKVnx89Wy0GbS+kf5cwCVFFzdCFh2XSCFNULS6csw==",
-      "license": "MIT",
       "engines": {
         "node": ">= 0.4"
       }
     },
     "node_modules/es-object-atoms": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/es-object-atoms/-/es-object-atoms-1.1.2.tgz",
-      "integrity": "sha512-HWcBoN6NileqtSydK2FqHbS/LoDd2pqrnQHLyJzBj4kOp/ky2MWMN694xOfkK8/SnUsW2DH7EfyVlydKCsm1Zw==",
-      "license": "MIT",
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/es-object-atoms/-/es-object-atoms-1.1.1.tgz",
+      "integrity": "sha512-FGgH2h8zKNim9ljj7dankFPcICIK9Cp5bm+c2gQSYePhpaG5+esrLODihIorn+Pe6FGJzWhXQotPv73jTaldXA==",
       "dependencies": {
         "es-errors": "^1.3.0"
       },
@@ -582,39 +530,38 @@
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