70 lines
1.8 KiB
JavaScript
70 lines
1.8 KiB
JavaScript
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var Utils = {
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createLocateRewrite: function(execName) {
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function rw(path) {
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if (path.endsWith('.worker.js')) {
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return execName + '.worker.js';
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} else if (path.endsWith('.js')) {
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return execName + '.js';
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} else if (path.endsWith('.wasm')) {
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return execName + '.wasm';
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}
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}
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return rw;
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},
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createInstantiatePromise: function(wasmLoader) {
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function instantiateWasm(imports, onSuccess) {
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wasmLoader.then(function(xhr) {
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WebAssembly.instantiate(xhr.response, imports).then(function(result) {
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onSuccess(result['instance'], result['module']);
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});
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});
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wasmLoader = null;
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return {};
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};
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return instantiateWasm;
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},
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copyToFS: function(fs, path, buffer) {
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var p = path.lastIndexOf("/");
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var dir = "/";
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if (p > 0) {
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dir = path.slice(0, path.lastIndexOf("/"));
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}
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try {
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fs.stat(dir);
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} catch (e) {
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if (e.errno !== 44) { // 'ENOENT', see https://github.com/emscripten-core/emscripten/blob/master/system/lib/libc/musl/arch/emscripten/bits/errno.h
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throw e;
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}
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fs['mkdirTree'](dir);
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}
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// With memory growth, canOwn should be false.
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fs['writeFile'](path, new Uint8Array(buffer), {'flags': 'wx+'});
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},
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findCanvas: function() {
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var nodes = document.getElementsByTagName('canvas');
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if (nodes.length && nodes[0] instanceof HTMLCanvasElement) {
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return nodes[0];
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}
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throw new Error("No canvas found");
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},
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isWebGLAvailable: function(majorVersion = 1) {
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var testContext = false;
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try {
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var testCanvas = document.createElement('canvas');
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if (majorVersion === 1) {
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testContext = testCanvas.getContext('webgl') || testCanvas.getContext('experimental-webgl');
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} else if (majorVersion === 2) {
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testContext = testCanvas.getContext('webgl2') || testCanvas.getContext('experimental-webgl2');
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}
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} catch (e) {}
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return !!testContext;
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}
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};
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