@woosh/meep-engine/src/engine/graphics/ecs/light/LightContext.js

Pure JavaScript game engine. Fully featured and production ready.

import { SystemEntityContext } from "../../../ecs/system/SystemEntityContext.js";
import { FPLightBinding } from "./binding/fp/FPLightBinding.js";
import { ThreeLightBinding } from "./binding/three/ThreeLightBinding.js";
import { LightType } from "./LightType.js";

export class LightContext extends SystemEntityContext {

    /**
     *
     * @type {LightBinding|null}
     * @private
     */
    __binding = null;

    /**
     *
     * @return {Light}
     */
    getLight() {
        return this.components[0];
    }

    /**
     *
     * @return {Transform}
     */
    getTransform() {
        return this.components[1];
    }

    __rebuild() {
        this.__binding.unlink(this);
        this.__build();
        this.__binding.link(this);
    }

    __build() {
        if (this.getLight().type.getValue() === LightType.POINT && this.system.__use_forward_plus) {
            this.__binding = new FPLightBinding();
        } else {
            this.__binding = new ThreeLightBinding();
        }

        this.__binding.component_light = this.getLight();
        this.__binding.component_transform = this.getTransform();
    }

    applySettings() {
        this.__binding.applySettings(this.system.settings);
    }

    link() {
        this.__build();
        this.__binding.link(this);

        this.getLight().type.onChanged.add(this.__rebuild, this);
    }

    unlink() {

        this.getLight().type.onChanged.remove(this.__rebuild, this);

        this.__binding.unlink(this);

    }
}