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- /*
- * Copyright 2019, Gregg Tavares.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- * * Neither the name of Gregg Tavares. nor the names of his
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
- /* global */
- 'use strict'; // eslint-disable-line
- (function() {
- const lessonSettings = self.lessonSettings || {};
- function isInEditor() {
- return self.location.href.substring(0, 4) === 'blob';
- }
- function sendMessage(data) {
- self.postMessage({
- type: '__editor__',
- data,
- });
- }
- const origConsole = {};
- function setupConsole() {
- function wrapFunc(obj, logType) {
- const origFunc = obj[logType].bind(obj);
- origConsole[logType] = origFunc;
- return function(...args) {
- origFunc(...args);
- sendMessage({
- type: 'log',
- logType,
- msg: [...args].join(' '),
- });
- };
- }
- self.console.log = wrapFunc(self.console, 'log');
- self.console.warn = wrapFunc(self.console, 'warn');
- self.console.error = wrapFunc(self.console, 'error');
- }
- /**
- * Gets a WebGL context.
- * makes its backing store the size it is displayed.
- * @param {OffscreenCanvas} canvas a canvas element.
- * @memberOf module:webgl-utils
- */
- let setupLesson = function(canvas) {
- // only once
- setupLesson = function() {};
- if (canvas) {
- canvas.addEventListener('webglcontextlost', function() {
- // the default is to do nothing. Preventing the default
- // means allowing context to be restored
- // e.preventDefault(); // can't do this because firefox bug - https://bugzilla.mozilla.org/show_bug.cgi?id=1633280
- sendMessage({
- type: 'lostContext',
- });
- });
- }
- };
- function captureJSErrors() {
- // capture JavaScript Errors
- self.addEventListener('error', function(e) {
- const msg = e.message || e.error;
- const url = e.filename;
- const lineNo = e.lineno || 1;
- const colNo = e.colno || 1;
- sendMessage({
- type: 'jsError',
- lineNo,
- colNo,
- url,
- msg,
- });
- });
- }
- const isWebGLRE = /^(webgl|webgl2|experimental-webgl)$/i;
- function installWebGLLessonSetup() {
- OffscreenCanvas.prototype.getContext = (function(oldFn) {
- return function() {
- const type = arguments[0];
- const isWebGL = isWebGLRE.test(type);
- if (isWebGL) {
- setupLesson(this);
- }
- const args = [].slice.apply(arguments);
- args[1] = {
- powerPreference: 'low-power',
- ...args[1],
- };
- return oldFn.apply(this, args);
- };
- }(OffscreenCanvas.prototype.getContext));
- }
- function installWebGLDebugContextCreator() {
- if (!self.webglDebugHelper) {
- return;
- }
- const {
- makeDebugContext,
- glFunctionArgToString,
- glEnumToString,
- } = self.webglDebugHelper;
- // capture GL errors
- OffscreenCanvas.prototype.getContext = (function(oldFn) {
- return function() {
- let ctx = oldFn.apply(this, arguments);
- // Using bindTexture to see if it's WebGL. Could check for instanceof WebGLRenderingContext
- // but that might fail if wrapped by debugging extension
- if (ctx && ctx.bindTexture) {
- ctx = makeDebugContext(ctx, {
- maxDrawCalls: 100,
- errorFunc: function(err, funcName, args) {
- const numArgs = args.length;
- const enumedArgs = [].map.call(args, function(arg, ndx) {
- let str = glFunctionArgToString(funcName, numArgs, ndx, arg);
- // shorten because of long arrays
- if (str.length > 200) {
- str = str.substring(0, 200) + '...';
- }
- return str;
- });
- {
- const error = new Error();
- sendMessage({
- type: 'jsErrorWithStack',
- stack: error.stack,
- msg: `${glEnumToString(err)} in ${funcName}(${enumedArgs.join(', ')})`,
- });
- }
- },
- });
- }
- return ctx;
- };
- }(OffscreenCanvas.prototype.getContext));
- }
- installWebGLLessonSetup();
- if (isInEditor()) {
- setupConsole();
- captureJSErrors();
- if (lessonSettings.glDebug !== false) {
- installWebGLDebugContextCreator();
- }
- }
- }());
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