121 lines
3.2 KiB
JavaScript
121 lines
3.2 KiB
JavaScript
console.log("loading engine");
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const initEvent = () => {
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let subscribers = {};
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return (message, ...messageArgs) => {
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switch (message) {
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case "addSubscriber":
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let subscriberName = messageArgs[0];
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let subscriberFunc = messageArgs[1];
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subscribers[subscriberName] = subscriberFunc;
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break;
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case "raise":
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let delta = messageArgs[0];
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let eventData = messageArgs[1];
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Object.entries(subscribers).forEach(([id, subscriber]) => {
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subscriber(delta, eventData);
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});
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break;
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}
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};
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};
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const engine = (() => {
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let queue = [];
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let timer;
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let time = Date.now();
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let entities = {};
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let components = {};
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let events = {};
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const engineTick = 1000 / 60;
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const tick = () => {
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let now = Date.now();
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let delta = now - time;
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time = now;
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while (queue.length > 0) {
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let eventName = queue.shift();
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events[eventName]("raise", delta);
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}
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timer = setTimeout(tick, engineTick);
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};
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const halt = () => {
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console.log("halted");
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clearTimeout(timer);
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};
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return (message, ...messageArgs) => {
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switch (message) {
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case "queueEvent": {
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queue.push(messageArgs[0]);
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break;
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}
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case "events": {
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return events;
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}
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case "entities": {
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return entities;
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}
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case "components": {
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return components;
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}
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case "world": {
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return {
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entities,
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components,
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events,
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};
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}
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case "registerEntity": {
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let node = messageArgs[0];
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entities[node] = [];
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break;
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}
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case "removeEntity": {
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let node = messageArgs[0];
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entities[node].forEach(([componentType, component]) => {
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components[componentType].remove(component);
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});
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delete entities[node];
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queue.push((_) => node.remove());
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break;
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}
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case "registerComponentType": {
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let componentType = messageArgs[0];
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components[componentType] = new Set();
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break;
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}
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case "addComponent": {
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let [entity, componentType, component] = messageArgs;
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entities[entity].push([componentType, component]);
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components[componentType].add(component);
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break;
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}
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case "registerEvent": {
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let eventName = messageArgs[0];
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let newEvent = initEvent();
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events[eventName] = newEvent;
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break;
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}
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case "subscribeToEvent": {
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let [eventName, subscriberName, newSubscriber] = messageArgs;
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events[eventName]("addSubscriber", subscriberName, newSubscriber);
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break;
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}
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case 'start': {
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tick();
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break;
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}
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case 'halt': {
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halt();
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break;
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}
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};
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};
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})();
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initTransformSystem(engine);
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inputSystem(engine);
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playerSystem(engine);
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engine("start");
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