@polygonjs/polygonjs/dist/src/engine/poly/PolyCanvasRegister.js

node-based WebGL 3D engine https://polygonjs.com

"use strict";
export class PolyCanvasRegister {
  constructor(poly) {
    this.poly = poly;
    this._rendererByCanvas = /* @__PURE__ */ new Map();
  }
  findOrCreateCanvas() {
    const canvas = this._findAvailableCanvas() || this._createCanvas();
    return canvas;
  }
  _findAvailableCanvas() {
    let foundCanvas;
    this._rendererByCanvas.forEach((renderer, canvas) => {
      if (foundCanvas == null && renderer == null) {
        foundCanvas = canvas;
      }
    });
    return foundCanvas;
  }
  _createCanvas() {
    return document.createElement("canvas");
  }
  registerCanvas(canvas, renderer) {
    this._rendererByCanvas.set(canvas, renderer);
  }
  deregisterCanvas(canvas) {
    this._rendererByCanvas.set(canvas, null);
  }
  dummyCanvas() {
    return this._dummyCanvas || (this._dummyCanvas = document.createElement("canvas"));
  }
}