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/*
Copyright (c) 2019 The Khronos Group Inc.
Use of this source code is governed by an MIT-style license that can be
found in the LICENSE.txt file.
*/
function constructTypedArray(type, data) {
if (type == 'Int8Array') {
return new Int8Array(data);
} else if (type == 'Uint8Array') {
return new Uint8Array(data);
} else if (type == 'Uint8ClampedArray') {
return new Uint8ClampedArray(data);
} else if (type == 'Int16Array') {
return new Int16Array(data);
} else if (type == 'Uint16Array') {
return new Uint16Array(data);
} else if (type == 'Int32Array') {
return new Int32Array(data);
} else if (type == 'Uint32Array') {
return new Uint32Array(data);
} else if (type == 'Float32Array') {
return new Float32Array(data);
} else if (type == 'Float64Array') {
return new Float64Array(data);
}
}
function constructDataView(subType, elementSizeInBytes, data) {
var setter = "set" + subType;
var byteOffset = 0;
var buffer = new ArrayBuffer(elementSizeInBytes * data.length);
var dataView = new DataView(buffer);
for (var ii = 0; ii < data.length; ++ii) {
dataView[setter](byteOffset, data[ii]);
byteOffset += elementSizeInBytes;
}
return dataView;
}
onmessage = function(event) {
var message = event.data;
if (message.command == 'copy' ||
message.command == 'transfer' ||
message.command == 'copyBuffer' ||
message.command == 'transferBuffer') {
var view;
if (message.type != 'DataView') {
view = constructTypedArray(message.type, message.data);
} else {
view = constructDataView(message.subType, message.elementSizeInBytes, message.data);
}
var valueToSend;
if (message.command == 'copy' ||
message.command == 'transfer') {
valueToSend = view;
} else {
valueToSend = view.buffer;
}
var transferablesToSend = undefined;
if (message.command == 'transfer' ||
message.command == 'transferBuffer') {
transferablesToSend = [ view.buffer ];
}
postMessage(valueToSend, transferablesToSend);
} else if (message.command == 'pong') {
postMessage(message.data, message.transferables);
} else if (message.command == 'ignore') {
} else {
postMessage('error: unknown message');
}
};
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