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