Day night cycle

common/protocol.ts

@@ -7,7 +7,7 @@ export const AIR_ID = "bworld:air";
 
 // bump when a client and server of different versions can't play together.
 // the server rejects a different version before the client downloads anything
-export const PROTOCOL_VERSION = 2;
+export const PROTOCOL_VERSION = 3;
 
 export interface PlayerInfo {
 	id: string;
@@ -101,6 +101,8 @@ export type ServerMessage =
 		changes: BlockChange[];
 		spawn: { x: number; y: number; z: number; yaw: number; pitch: number };
 		selected_slot: number;
+		// world time in ticks, see common/time.ts
+		time: number;
 	}
 	| { type: "player_join"; player: PlayerInfo }
 	| { type: "player_leave"; id: string }
@@ -120,7 +122,9 @@ export type ServerMessage =
 	| { type: "cursor"; item: ItemData | null }
 	| { type: "open_screen"; layout: ScreenLayout; properties: Record<string, number> }
 	| { type: "screen_properties"; properties: Record<string, number> }
-	| { type: "close_screen" };
+	| { type: "close_screen" }
+	// the world time, every second and when it's changed. clients count ticks in between
+	| { type: "time"; time: number };
 
 export const MAX_NAME_LENGTH = 16;
 export const MAX_CHAT_LENGTH = 256;