the-world-engine/dist/esm/engine/render/CameraContainer.js

three.js based, unity like game engine for browser

import { OrderedSet } from "js-sdsl";

import { EventContainer } from "../collection/EventContainer";

export class CameraContainer {
    ir=null;
    nr;
    ar;
    sr;
    hr;
    constructor(t) {
        this.nr = new Map;
        this.ar = new OrderedSet(undefined, ((t, r) => {
            if (t.info.priority === r.info.priority) {
                return t.camera.instanceId - r.camera.instanceId;
            }
            return r.info.priority - t.info.priority;
        }));
        this.sr = t;
        this.hr = new EventContainer;
    }
    get camera() {
        return this.ir?.camera ?? null;
    }
    get currentCameraPriority() {
        return this.ir?.info.priority ?? Number.MIN_SAFE_INTEGER;
    }
    addCamera(t, r) {
        this.nr.set(t, r);
        this.ar.insert({
            camera: t,
            info: r
        });
        this.ur();
    }
    removeCamera(t) {
        const r = this.nr.get(t);
        if (!r) return;
        this.ar.eraseElementByKey({
            camera: t,
            info: r
        });
        this.nr.delete(t);
        this.ur();
    }
    changeCameraPriority(t, r) {
        const e = this.nr.get(t);
        if (!e) return;
        this.ar.eraseElementByKey({
            camera: t,
            info: e
        });
        e.priority = r;
        this.ar.insert({
            camera: t,
            info: e
        });
        this.ur();
    }
    changeCameraBackgroundColor(t, r) {
        const e = this.nr.get(t);
        if (!e) return;
        e.backgroundColor = r;
        if (this.ir?.camera === t) {
            this.sr(r);
        }
    }
    ur() {
        if (this.ar.size() === 0) {
            this.ir = null;
            return;
        }
        const t = this.ar.front();
        if (!t) {
            this.ir = null;
            return;
        }
        if (this.ir?.camera === t.camera) return;
        this.ir = t;
        this.sr(this.ir.info.backgroundColor);
        this.hr.invoke(this.ir.camera);
    }
    get onCameraChanged() {
        return this.hr;
    }
}