Send authoritative multiplayer inputs from browser

src/multiplayer.js

@@ -8,12 +8,15 @@ const KEYCLOAK_CONFIG = {
   clientId: 'airship-web',
 };
 
+const clamp = (value, min, max) => Math.max(min, Math.min(max, value));
+
 const keycloak = new Keycloak(KEYCLOAK_CONFIG);
 let socket = null;
 let selfId = null;
 let reconnectTimer = null;
 let authenticated = false;
 let playerCount = 0;
+let inputSequence = 0;
 
 const statusButton = document.createElement('button');
 statusButton.id = 'multiplayer-status';
@@ -30,7 +33,7 @@ style.textContent = `
     left: max(10px, env(safe-area-inset-left));
     z-index: 410;
     min-height: 38px;
-    max-width: 180px;
+    max-width: 190px;
     padding: 7px 11px;
     border: 1px solid rgba(220, 168, 79, .72);
     border-radius: 999px;
@@ -95,6 +98,7 @@ const connect = async () => {
   socket = ws;
 
   ws.addEventListener('open', () => {
+    inputSequence = 0;
     setStatus('online', 'MULTIPLAYER • ONLINE');
     emitConnection('online');
   });
@@ -110,13 +114,24 @@ const connect = async () => {
     }
 
     if (message.type === 'snapshot') {
-      const players = Array.isArray(message.players)
-        ? message.players.filter((player) => player?.id && player.id !== selfId)
+      const allPlayers = Array.isArray(message.players)
+        ? message.players.filter((player) => player?.id)
         : [];
-      playerCount = players.length + 1;
-      setStatus('online', `MULTIPLAYER • ${playerCount}`);
+      const self = allPlayers.find((player) => player.id === selfId) || null;
+      const players = allPlayers.filter((player) => player.id !== selfId);
+      const projectiles = Array.isArray(message.projectiles)
+        ? message.projectiles.filter((shot) => shot?.id)
+        : [];
+      playerCount = allPlayers.length;
+      const score = self ? ` • ${self.kills || 0}/${self.deaths || 0}` : '';
+      setStatus('online', `MULTIPLAYER • ${playerCount}${score}`);
       window.dispatchEvent(new CustomEvent('airship:multiplayer-snapshot', {
-        detail: { players, serverTime: message.serverTime || 0 },
+        detail: {
+          self,
+          players,
+          projectiles,
+          serverTime: message.serverTime || 0,
+        },
       }));
     }
   });
@@ -134,15 +149,24 @@ const connect = async () => {
   });
 };
 
-const sendState = (state) => {
-  if (socket?.readyState !== WebSocket.OPEN || !state) return false;
+const sendInput = (input = {}) => {
+  if (socket?.readyState !== WebSocket.OPEN) return 0;
+  inputSequence += 1;
   socket.send(JSON.stringify({
-    type: 'state',
-    x: Number(state.x) || 0,
-    y: Number(state.y) || 0,
-    angle: Number(state.angle) || 0,
-    hull: Math.max(0, Math.round(Number(state.hull) || 0)),
+    type: 'input',
+    seq: inputSequence,
+    throttle: clamp(Number(input.throttle) || 0, -1, 1),
+    steer: clamp(Number(input.steer) || 0, -1, 1),
+    stop: Boolean(input.stop),
+    docked: Boolean(input.docked),
   }));
+  return inputSequence;
+};
+
+const fire = (side) => {
+  if (socket?.readyState !== WebSocket.OPEN) return false;
+  const normalized = side === 'port' || side === -1 ? 'port' : 'starboard';
+  socket.send(JSON.stringify({ type: 'fire', side: normalized }));
   return true;
 };
 
@@ -158,10 +182,12 @@ statusButton.addEventListener('click', () => {
 });
 
 window.airshipMultiplayer = {
-  sendState,
+  sendInput,
+  fire,
   login,
   logout,
   connect,
+  getSelfId: () => selfId,
   isAuthenticated: () => authenticated,
   isConnected: () => socket?.readyState === WebSocket.OPEN,
 };