Source: packages/utils/src/browser/isWebGLSupported.js

import { settings } from '../settings';
let supported;
/**
 * Helper for checking for WebGL support.
 *
 * @memberof PIXI.utils
 * @function isWebGLSupported
 * @return {boolean} Is WebGL supported.
 */
export function isWebGLSupported() {
    if (typeof supported === 'undefined') {
        supported = (function supported() {
            const contextOptions = {
                stencil: true,
                failIfMajorPerformanceCaveat: settings.FAIL_IF_MAJOR_PERFORMANCE_CAVEAT,
            };
            try {
                if (!window.WebGLRenderingContext) {
                    return false;
                }
                const canvas = document.createElement('canvas');
                let gl = (canvas.getContext('webgl', contextOptions)
                    || canvas.getContext('experimental-webgl', contextOptions));
                const success = !!(gl && gl.getContextAttributes().stencil);
                if (gl) {
                    const loseContext = gl.getExtension('WEBGL_lose_context');
                    if (loseContext) {
                        loseContext.loseContext();
                    }
                }
                gl = null;
                return success;
            }
            catch (e) {
                return false;
            }
        })();
    }
    return supported;
}