Serialization for multiplayer

[krispya]

Our implementation will be based on bitECS v0.4's https://github.com/NateTheGreatt/bitECS/tree/rc-0-4-0/src/serialization

// server
const serverWorld = createWorld()

// message components
const NetworkMessage = {}
const IdentityMessage = { entityId: [] }
// id msg setter
observe(serverWorld, onSet(IdentityMessage), (msgEid, value) => {IdentityMessage.entityId[msgEid] = value})

// msgs serialzier
const serializeNetworkMessages = createObserverSerializer(serverWorld, NetworkMessage, [IdentityMessage, ...otherMessageTypes])

// new player comes in
const newPlayer = addEntity(serverWorld)

// Add a new msg
const msg = addEntity(serverWorld)
addComponent(serverWorld, msg, NetworkMessage)
addComponent(serverWorld, msg, set(IdentityMessage, newPlayer))

const serializedData = serializeNetworkMessages();

// Remove the msg
removeEntity(serverWorld, msg);

// client
const clientWorld = createWorld()
const deserializeEvents = createObserverDeserializer(clientWorld, NetworkMessage, [IdentityMessage])

// Deserialize the events into clientWorld
deserializeEvents(clientWorld, serializedData)

// Process Identity Message
for (const eid of query(world, [NetworkMessage, IdentityMessage])) {
    const myEntity = IdentityMessage.entityId[eid]
    // process msg, then remove
    removeEntity(clientWorld, eid)
}