127 lines
3.0 KiB
JavaScript
127 lines
3.0 KiB
JavaScript
// Node.
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import {performance} from 'perf_hooks';
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// 3rd party.
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import immutablediff from 'immutablediff';
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// 2nd party.
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import {
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create as createEntity,
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EntityList,
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registerTrait,
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} from '@avocado/entity';
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import {StateSynchronizer} from '@avocado/state';
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// Traits.
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import {Controllable} from './traits/controllable';
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registerTrait(Controllable);
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// Create game.
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export default function(avocadoServer) {
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avocadoServer.on('connect', createConnectionListener(avocadoServer));
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setInterval(createMainLoop(avocadoServer), 1000 / 80);
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}
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// Entity tracking.
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const entityList = new EntityList();
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const stateSynchronizer = new StateSynchronizer({
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entityList,
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});
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// Connection listener.
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function createConnectionListener(avocadoServer) {
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return (socket) => {
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// Create and track a new entity for the connection.
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const entity = createEntityForConnection();
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entityList.addEntity(entity);
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socket.entity = entity;
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// Send complete state.
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socket.send({
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type: 'state-update',
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payload: stateSynchronizer.state().toJS(),
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});
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// Listen for events.
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socket.on('message', createMessageListener(avocadoServer, socket));
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socket.on('disconnect', createDisconnectionListener(avocadoServer, socket));
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}
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}
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// Handle incoming messages.
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function createMessageListener(avocadoServer, socket) {
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const {entity} = socket;
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return ({type, payload}) => {
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switch (type) {
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case 'input':
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entity.inputState = payload;
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break;
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}
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};
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}
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// Handle disconnection.
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function createDisconnectionListener(avocadoServer, socket) {
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const {entity} = socket;
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return () => {
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entityList.removeEntity(entity);
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avocadoServer.broadcast({
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type: 'state-update',
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payload: {
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entityList: {
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[entity.instanceUuid]: false,
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},
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},
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});
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};
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}
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// Create an entity for a new connection.
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function createEntityForConnection() {
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const entity = createEntity();
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return entity.fromJSON({
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traits: {
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animated: {
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params: {
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animations: {
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idle: {
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offset: [0, -48],
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uri: '/idle.animation.json',
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},
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moving: {
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offset: [0, -48],
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uri: '/moving.animation.json',
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},
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}
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},
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},
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controllable: {},
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directional: {
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params: {
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directionCount: 4,
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},
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},
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existent: {},
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graphical: {},
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mobile: {
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state: {
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speed: 400,
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},
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},
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positioned: {
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state: {
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x: 100,
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y: 100,
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},
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},
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},
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});
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}
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// Main loop.
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let lastTime = performance.now();
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function createMainLoop(avocadoServer) {
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return () => {
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const now = performance.now();
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const elapsed = (now - lastTime) / 1000;
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lastTime = now;
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entityList.tick(elapsed);
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const diff = stateSynchronizer.diff();
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if (StateSynchronizer.noChange === diff) {
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return;
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}
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avocadoServer.broadcast({
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type: 'state-update',
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payload: diff,
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});
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}
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}
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