Spaces:
Sleeping
Sleeping
File size: 3,796 Bytes
cd6720a | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 | 'use strict';
exports.supported = isSupported;
exports.notSupportedReason = notSupportedReason;
/**
* Test whether the current browser supports Mapbox GL JS
* @param {Object} options
* @param {boolean} [options.failIfMajorPerformanceCaveat=false] Return `false`
* if the performance of Mapbox GL JS would be dramatically worse than
* expected (i.e. a software renderer is would be used)
* @return {boolean}
*/
function isSupported(options) {
return !notSupportedReason(options);
}
function notSupportedReason(options) {
if (!isBrowser()) return 'not a browser';
if (!isWorkerSupported()) return 'insufficient worker support';
if (!isCanvasGetImageDataSupported()) return 'insufficient Canvas/getImageData support';
if (!isWebGLSupportedCached(options && options.failIfMajorPerformanceCaveat)) return 'insufficient WebGL2 support';
if (!isNotIE()) return 'insufficient ECMAScript 6 support';
}
function isBrowser() {
return typeof window !== 'undefined' && typeof document !== 'undefined';
}
function isWorkerSupported() {
if (!('Worker' in window && 'Blob' in window && 'URL' in window)) {
return false;
}
var blob = new Blob([''], { type: 'text/javascript' });
var workerURL = URL.createObjectURL(blob);
var supported;
var worker;
try {
worker = new Worker(workerURL);
supported = true;
} catch (e) {
supported = false;
}
if (worker) {
worker.terminate();
}
URL.revokeObjectURL(workerURL);
return supported;
}
// Some browsers or browser extensions block access to canvas data to prevent fingerprinting.
// Mapbox GL uses this API to load sprites and images in general.
function isCanvasGetImageDataSupported() {
var canvas = document.createElement('canvas');
canvas.width = canvas.height = 1;
var context = canvas.getContext('2d');
if (!context) {
return false;
}
var imageData = context.getImageData(0, 0, 1, 1);
return imageData && imageData.width === canvas.width;
}
var isWebGLSupportedCache = {};
function isWebGLSupportedCached(failIfMajorPerformanceCaveat) {
if (isWebGLSupportedCache[failIfMajorPerformanceCaveat] === undefined) {
isWebGLSupportedCache[failIfMajorPerformanceCaveat] = isWebGLSupported(failIfMajorPerformanceCaveat);
}
return isWebGLSupportedCache[failIfMajorPerformanceCaveat];
}
isSupported.webGLContextAttributes = {
antialias: false,
alpha: true,
stencil: true,
depth: true
};
function getWebGLContext(failIfMajorPerformanceCaveat) {
var canvas = document.createElement('canvas');
var attributes = Object.create(isSupported.webGLContextAttributes);
attributes.failIfMajorPerformanceCaveat = failIfMajorPerformanceCaveat;
return canvas.getContext('webgl2', attributes);
}
function isWebGLSupported(failIfMajorPerformanceCaveat) {
var gl = getWebGLContext(failIfMajorPerformanceCaveat);
if (!gl) {
return false;
}
// Try compiling a shader and get its compile status. Some browsers like Brave block this API
// to prevent fingerprinting. Unfortunately, this also means that Mapbox GL won't work.
var shader;
try {
shader = gl.createShader(gl.VERTEX_SHADER);
} catch (e) {
// some older browsers throw an exception that `createShader` is not defined
// so handle this separately from the case where browsers block `createShader`
// for security reasons
return false;
}
if (!shader || gl.isContextLost()) {
return false;
}
gl.shaderSource(shader, 'void main() {}');
gl.compileShader(shader);
return gl.getShaderParameter(shader, gl.COMPILE_STATUS) === true;
}
function isNotIE() {
return !document.documentMode;
}
|