src/viewer/scene/PerformanceModel/lib/layers/linesInstancing/LinesInstancingRenderers.js

import {LinesInstancingColorRenderer} from "./renderers/LinesInstancingColorRenderer.js";
import {LinesInstancingSilhouetteRenderer} from "./renderers/LinesInstancingSilhouetteRenderer.js";

/**
 * @private
 */
class LinesInstancingRenderers {

    constructor(scene) {
        this._scene = scene;
    }

    _compile() {
        if (this._colorRenderer && (!this._colorRenderer.getValid())) {
            this._colorRenderer.destroy();
            this._colorRenderer = null;
        }
        if (this._silhouetteRenderer && (!this._silhouetteRenderer.getValid())) {
            this._silhouetteRenderer.destroy();
            this._silhouetteRenderer = null;
        }
    }

    get colorRenderer() {
        if (!this._colorRenderer) {
            this._colorRenderer = new LinesInstancingColorRenderer(this._scene);
        }
        return this._colorRenderer;
    }

    get silhouetteRenderer() {
        if (!this._silhouetteRenderer) {
            this._silhouetteRenderer = new LinesInstancingSilhouetteRenderer(this._scene);
        }
        return this._silhouetteRenderer;
    }

    _destroy() {
        if (this._colorRenderer) {
            this._colorRenderer.destroy();
        }
        if (this._silhouetteRenderer) {
            this._silhouetteRenderer.destroy();
        }
    }
}

const cachedRenderers = {};

/**
 * @private
 */
function getInstancingRenderers(scene) {
    const sceneId = scene.id;
    let instancingRenderers = cachedRenderers[sceneId];
    if (!instancingRenderers) {
        instancingRenderers = new LinesInstancingRenderers(scene);
        cachedRenderers[sceneId] = instancingRenderers;
        instancingRenderers._compile();
        scene.on("compile", () => {
            instancingRenderers._compile();
        });
        scene.on("destroyed", () => {
            delete cachedRenderers[sceneId];
            instancingRenderers._destroy();
        });
    }
    return instancingRenderers;
}

export {getInstancingRenderers};