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io.js
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/*
* Copyright 2009, Google Inc.
* 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 Google Inc. nor the names of its
* 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.
*/
/**
* @fileoverview This file contains various functions and class for io.
*/
o3djs.provide('o3djs.io');
o3djs.require('o3djs.texture');
/**
* A Module with various io functions and classes.
* @namespace
*/
o3djs.io = o3djs.io || {};
/**
* Creates a LoadInfo object.
* @param {(!o3d.ArchiveRequest|!o3d.FileRequest|!XMLHttpRequest)} opt_request
* The request to watch.
* @param {boolean} opt_hasStatus true if opt_request is a
* o3d.ArchiveRequest vs for example an o3d.FileRequest or an
* XMLHttpRequest.
* @return {!o3djs.io.LoadInfo} The new LoadInfo.
* @see o3djs.io.LoadInfo
*/
o3djs.io.createLoadInfo = function(opt_request, opt_hasStatus) {
return new o3djs.io.LoadInfo(opt_request, opt_hasStatus);
};
/**
* A class to help with progress reporting for most loading utilities.
*
* Example:
* <pre>
* var g_loadInfo = null;
* g_id = window.setInterval(statusUpdate, 500);
* g_loadInfo = o3djs.scene.loadScene(client, pack, parent,
* 'http://google.com/somescene.o3dtgz',
* callback);
*
* function callback(pack, parent, exception) {
* g_loadInfo = null;
* window.clearInterval(g_id);
* if (!exception) {
* // do something with scene just loaded
* }
* }
*
* function statusUpdate() {
* if (g_loadInfo) {
* var progress = g_loadInfo.getKnownProgressInfoSoFar();
* document.getElementById('loadstatus').innerHTML = progress.percent;
* }
* }
* </pre>
*
* @constructor
* @param {(!o3d.ArchiveRequest|!o3d.FileRequest|!XMLHttpRequest)} opt_request
* The request to watch.
* @param {boolean} opt_hasStatus true if opt_request is a
* o3d.ArchiveRequest vs for example an o3d.FileRequest or an
* XMLHttpRequest.
* @see o3djs.scene.loadScene
* @see o3djs.io.loadArchive
* @see o3djs.io.loadTexture
* @see o3djs.loader.Loader
*/
o3djs.io.LoadInfo = function(opt_request, opt_hasStatus) {
this.request_ = opt_request;
this.hasStatus_ = opt_hasStatus;
this.streamLength_ = 0; // because the request may have been freed.
this.children_ = [];
};
/**
* Adds another LoadInfo as a child of this LoadInfo so they can be
* managed as a group.
* @param {!o3djs.io.LoadInfo} loadInfo The child LoadInfo.
*/
o3djs.io.LoadInfo.prototype.addChild = function(loadInfo) {
this.children_.push(loadInfo);
};
/**
* Marks this LoadInfo as finished.
*/
o3djs.io.LoadInfo.prototype.finish = function() {
if (this.request_) {
if (this.hasStatus_) {
this.streamLength_ = this.request_.streamLength;
}
this.request_ = null;
}
};
/**
* Gets the total bytes that will be streamed known so far.
* If you are only streaming 1 file then this will be the info for that file but
* if you have queued up many files using an o3djs.loader.Loader only a couple of
* files are streamed at a time meaning that the size is not known for files
* that have yet started to download.
*
* If you are downloading many files for your application and you want to
* provide a progress status you have about 4 options
*
* 1) Use LoadInfo.getTotalBytesDownloaded() /
* LoadInfo.getTotalKnownBytesToStreamSoFar() and just be aware the bar will
* grown and then shrink as new files start to download and their lengths
* become known.
*
* 2) Use LoadInfo.getTotalRequestsDownloaded() /
* LoadInfo.getTotalKnownRequestsToStreamSoFar() and be aware the granularity
* is not all that great since it only reports fully downloaded files. If you
* are downloading a bunch of small files this might be ok.
*
* 3) Put all your files in one archive. Then there will be only one file and
* method 1 will work well.
*
* 4) Figure out the total size in bytes of the files you will download and put
* that number in your application, then use LoadInfo.getTotalBytesDownloaded()
* / MY_APPS_TOTAL_BYTES_TO_DOWNLOAD.
*
* @return {number} The total number of currently known bytes to be streamed.
*/
o3djs.io.LoadInfo.prototype.getTotalKnownBytesToStreamSoFar = function() {
if (!this.streamLength_ && this.request_ && this.hasStatus_) {
this.streamLength_ = this.request_.streamLength;
}
var total = this.streamLength_;
for (var cc = 0; cc < this.children_.length; ++cc) {
total += this.children_[cc].getTotalKnownBytesToStreamSoFar();
}
return total;
};
/**
* Gets the total bytes downloaded so far.
* @return {number} The total number of currently known bytes to be streamed.
*/
o3djs.io.LoadInfo.prototype.getTotalBytesDownloaded = function() {
var total = (this.request_ && this.hasStatus_) ?
this.request_.bytesReceived : this.streamLength_;
for (var cc = 0; cc < this.children_.length; ++cc) {
total += this.children_[cc].getTotalBytesDownloaded();
}
return total;
};
/**
* Gets the total streams that will be download known so far.
* We can't know all the streams since you could use an o3djs.loader.Loader
* object, request some streams, then call this function, then request some
* more.
*
* See LoadInfo.getTotalKnownBytesToStreamSoFar for details.
* @return {number} The total number of requests currently known to be streamed.
* @see o3djs.io.LoadInfo.getTotalKnownBytesToStreamSoFar
*/
o3djs.io.LoadInfo.prototype.getTotalKnownRequestsToStreamSoFar = function() {
var total = 1;
for (var cc = 0; cc < this.children_.length; ++cc) {
total += this.children_[cc].getTotalKnownRequestToStreamSoFar();
}
return total;
};
/**
* Gets the total requests downloaded so far.
* @return {number} The total requests downloaded so far.
*/
o3djs.io.LoadInfo.prototype.getTotalRequestsDownloaded = function() {
var total = this.request_ ? 0 : 1;
for (var cc = 0; cc < this.children_.length; ++cc) {
total += this.children_[cc].getTotalRequestsDownloaded();
}
return total;
};
/**
* Gets progress info.
* This is commonly formatted version of the information available from a
* LoadInfo.
*
* See LoadInfo.getTotalKnownBytesToStreamSoFar for details.
* @return {{percent: number, downloaded: string, totalBytes: string,
* base: number, suffix: string}} progress info.
* @see o3djs.io.LoadInfo.getTotalKnownBytesToStreamSoFar
*/
o3djs.io.LoadInfo.prototype.getKnownProgressInfoSoFar = function() {
var percent = 0;
var bytesToDownload = this.getTotalKnownBytesToStreamSoFar();
var bytesDownloaded = this.getTotalBytesDownloaded();
if (bytesToDownload > 0) {
percent = Math.floor(bytesDownloaded / bytesToDownload * 100);
}
var base = (bytesToDownload < 1024 * 1024) ? 1024 : (1024 * 1024);
return {
percent: percent,
downloaded: (bytesDownloaded / base).toFixed(2),
totalBytes: (bytesToDownload / base).toFixed(2),
base: base,
suffix: (base == 1024 ? 'kb' : 'mb')}
};
/**
* Loads text from an external file. This function is synchronous.
* @param {string} url The url of the external file.
* @return {string} the loaded text if the request is synchronous.
*/
o3djs.io.loadTextFileSynchronous = function(url) {
o3djs.BROWSER_ONLY = true;
var error = 'loadTextFileSynchronous failed to load url "' + url + '"';
var request;
if (!o3djs.base.IsMSIE() && window.XMLHttpRequest) {
request = new XMLHttpRequest();
if (request.overrideMimeType) {
request.overrideMimeType('text/plain');
}
} else if (window.ActiveXObject) {
request = new ActiveXObject('MSXML2.XMLHTTP.3.0');
} else {
throw 'XMLHttpRequest is disabled';
}
request.open('GET', url, false);
request.send(null);
if (request.readyState != 4) {
throw error;
}
return request.responseText;
};
/**
* Loads text from an external file. This function is asynchronous.
* @param {string} url The url of the external file.
* @param {function(string, *): void} callback A callback passed the loaded
* string and an exception which will be null on success.
* @return {!o3djs.io.LoadInfo} A LoadInfo to track progress.
*/
o3djs.io.loadTextFile = function(url, callback) {
o3djs.BROWSER_ONLY = true;
var error = 'loadTextFile failed to load url "' + url + '"';
var request;
if (!o3djs.base.IsMSIE() && window.XMLHttpRequest) {
request = new XMLHttpRequest();
if (request.overrideMimeType) {
request.overrideMimeType('text/plain');
}
} else if (window.ActiveXObject) {
request = new ActiveXObject('MSXML2.XMLHTTP.3.0');
} else {
throw 'XMLHttpRequest is disabled';
}
var loadInfo = o3djs.io.createLoadInfo(request, false);
request.open('GET', url, true);
var finish = function() {
if (request.readyState == 4) {
var text = '';
// HTTP reports success with a 200 status. The file protocol reports
// success with zero. HTTP does not use zero as a status code (they
// start at 100).
// https://developer.mozilla.org/En/Using_XMLHttpRequest
var success = request.status == 200 || request.status == 0;
if (success) {
text = request.responseText;
}
loadInfo.finish();
callback(text, success ? null : 'could not load: ' + url);
}
};
request.onreadystatechange = finish;
request.send(null);
return loadInfo;
};
/**
* A ArchiveInfo object loads and manages an archive of files.
* There are methods for locating a file by uri and for freeing
* the archive.
*
* You can only read archives that have as their first file a file named
* 'aaaaaaaa.o3d' the contents of the which is 'o3d'. This is to prevent O3D
* from being used to read arbitrary tar gz files.
*
* Example:
* <pre>
* var loadInfo = o3djs.io.loadArchive(pack,
* 'http://google.com/files.o3dtgz',
* callback);
*
* function callback(archiveInfo, exception) {
* if (!exception) {
* o3djs.texture.createTextureFromRawData(
* pack, archiveInfo.getFileByURI('logo.jpg'), true);
* o3djs.texture.createTextureFromRawData(
* pack, archiveInfo.getFileByURI('wood/oak.png'), true);
* o3djs.texture.createTextureFromRawData(
* pack, archiveInfo.getFileByURI('wood/maple.dds'), true);
* archiveInfo.destroy();
* } else {
* alert(exception);
* }
* }
* </pre>
*
* @constructor
* @param {!o3d.Pack} pack Pack to create request in.
* @param {string} url The url of the archive file.
* @param {!function(!o3djs.io.ArchiveInfo, *): void} onFinished A
* callback that is called when the archive is finished loading and passed
* the ArchiveInfo and an exception which is null on success.
*/
o3djs.io.ArchiveInfo = function(pack, url, onFinished) {
var that = this;
/**
* The list of files in the archive by uri.
* @type {!Object}
*/
this.files = {};
/**
* The pack used to create the archive request.
* @type {!o3d.Pack}
*/
this.pack = pack;
/**
* True if this archive has not be destroyed.
* @type {boolean}
*/
this.destroyed = false;
this.request_ = null;
/**
* Records each RawData file as it comes in.
* @private
* @param {!o3d.RawData} rawData RawData from archive request.
*/
function addFile(rawData) {
that.files[rawData.uri] = rawData;
}
/**
* The LoadInfo to track loading progress.
* @type {!o3djs.io.LoadInfo}
*/
this.loadInfo = o3djs.io.loadArchiveAdvanced(
pack,
url,
addFile,
function(request, exception) {
that.request_ = request;
onFinished(that, exception);
});
};
/**
* Releases all the RAW data associated with this archive. It does not release
* any objects created from that RAW data.
*/
o3djs.io.ArchiveInfo.prototype.destroy = function() {
if (!this.destroyed) {
this.pack.removeObject(this.request_);
this.destroyed = true;
this.files = {};
}
};
/**
* Gets files by regular expression or wildcards from the archive.
* @param {(string|!RegExp)} uri of file to get. Can have wildcards '*' and '?'.
* @param {boolean} opt_caseInsensitive Only valid if it's a wildcard string.
* @return {!Array.<!o3d.RawData>} An array of the matching RawDatas for
* the files matching or undefined if it doesn't exist.
*/
o3djs.io.ArchiveInfo.prototype.getFiles = function(uri,
opt_caseInsensitive) {
if (!(uri instanceof RegExp)) {
uri = uri.replace(/(\W)/g, '\\$&');
uri = uri.replace(/\\\*/g, '.*');
uri = uri.replace(/\\\?/g, '.');
uri = new RegExp(uri, opt_caseInsensitive ? 'i' : '');
}
var files = [];
for (var key in this.files) {
if (uri.test(key)) {
files.push(this.files[key]);
}
}
return files;
};
/**
* Gets a file by URI from the archive.
* @param {string} uri of file to get.
* @param {boolean} opt_caseInsensitive True to be case insensitive. Default
* false.
* @return {(o3d.RawData|undefined)} The RawData for the file or undefined if
* it doesn't exist.
*/
o3djs.io.ArchiveInfo.prototype.getFileByURI = function(
uri,
opt_caseInsensitive) {
if (opt_caseInsensitive) {
uri = uri.toLowerCase();
for (var key in this.files) {
if (key.toLowerCase() == uri) {
return this.files[key];
}
}
return undefined;
} else {
return this.files[uri];
}
};
/**
* Loads an archive file.
* When the entire archive is ready the onFinished callback will be called
* with an ArchiveInfo for accessing the archive.
*
* @param {!o3d.Pack} pack Pack to create request in.
* @param {string} url The url of the archive file.
* @param {!function(!o3djs.io.ArchiveInfo, *): void} onFinished A
* callback that is called when the archive is successfully loaded and an
* Exception object which is null on success.
* @return {!o3djs.io.LoadInfo} The a LoadInfo for tracking progress.
* @see o3djs.io.ArchiveInfo
*/
o3djs.io.loadArchive = function(pack,
url,
onFinished) {
var archiveInfo = new o3djs.io.ArchiveInfo(pack, url, onFinished);
return archiveInfo.loadInfo;
};
/**
* Loads an archive file. This function is asynchronous. This is a low level
* version of o3djs.io.loadArchive which can be used for things like
* progressive loading.
*
* @param {!o3d.Pack} pack Pack to create request in.
* @param {string} url The url of the archive file.
* @param {!function(!o3d.RawData): void} onFileAvailable A callback, taking a
* single argument 'data'. As each file is loaded from the archive, this
* function is called with the file's data.
* @param {!function(!o3d.ArchiveRequest, *): void} onFinished
* A callback that is called when the archive is successfully loaded. It is
* passed the ArchiveRquest and null on success or a javascript exception on
* failure.
* @return {!o3djs.io.LoadInfo} A LoadInfo for tracking progress.
*/
o3djs.io.loadArchiveAdvanced = function(pack,
url,
onFileAvailable,
onFinished) {
var error = 'loadArchive failed to load url "' + url + '"';
var request = pack.createArchiveRequest();
var loadInfo = o3djs.io.createLoadInfo(request, true);
request.open('GET', url);
request.onfileavailable = onFileAvailable;
/**
* @ignore
*/
request.onreadystatechange = function() {
if (request.done) {
loadInfo.finish();
var success = request.success;
var exception = null;
if (!success) {
exception = request.error;
if (!exception) {
exception = 'unknown error loading archive';
}
}
onFinished(request, exception);
}
};
request.send();
return loadInfo;
};
/**
* Loads RawData.
*
* RawData is loaded asynchronously.
*
* @param {!o3d.Pack} pack Pack to create the request in.
* @param {string} url URL of raw data to load.
* @param {!function(!o3d.FileRequest, o3d.RawData, *): void} callback Callback
* when RawData is loaded. It will be passed the FileRequest, a RawData and
* an exception on error or null on success. The RawData is associated with
* the request so it will stay in memory until you free with request with
* pack.removeObject(request).
* @return {!o3djs.io.LoadInfo} A LoadInfo to track progress.
* @see o3djs.io.loadTexture
* @see o3djs.io.loadBitmaps
* @see o3djs.loader.createLoader
*/
o3djs.io.loadRawData = function(pack, url, callback) {
var request = pack.createFileRequest('RAWDATA');
var loadInfo = o3djs.io.createLoadInfo(
/** @type {!o3d.FileRequest} */ (request),
false);
request.open('GET', url, true);
/**
* @ignore
*/
request.onreadystatechange = function() {
if (request.done) {
var data = request.data;
var success = request.success;
var exception = request.error;
loadInfo.finish();
if (!success && !exception) {
exception = 'unknown error loading RawData: ' + url;
}
callback(request, data, success ? null : exception);
}
};
request.send();
return loadInfo;
};
/**
* Loads bitmaps.
*
* Bitmaps are loaded asynchronously.
*
* Example:
* <pre>
* var loadInfo = o3djs.io.loadBitamps(pack,
* 'http://google.com/someimage.jpg',
* callback);
*
* function callback(bitmaps, exception) {
* if (!exception) {
* o3djs.texture.createTextureFromBitmaps(g_pack, bitmaps, true);
* } else {
* alert(exception);
* }
* }
* </pre>
*
*
* @param {!o3d.Pack} pack Pack to load texture into.
* @param {string} url URL of image to load.
* @param {!function(!Array.<!o3d.Bitmap>, *): void} callback Callback when
* image is loaded. It will be passed an array of bitmaps and an exception
* on error or null on success.
* @param {boolean} opt_generateMips Generate Mips. Default = true.
* @return {!o3djs.io.LoadInfo} A LoadInfo to track progress.
* @see o3djs.io.loadTexture
* @see o3djs.loader.createLoader
*/
o3djs.io.loadBitmaps = function(pack, url, callback, opt_generateMips) {
if (typeof opt_generateMips === 'undefined') {
opt_generateMips = true;
}
return o3djs.io.loadRawData(pack, url, function(request, rawData, exception) {
var bitmaps = [];
if (!exception) {
bitmaps = pack.createBitmapsFromRawData(rawData);
pack.removeObject(request);
}
callback(bitmaps, exception);
});
};
/**
* Loads a texture.
*
* Textures are loaded asynchronously.
*
* Example:
* <pre>
* var loadInfo = o3djs.io.loadTexture(pack,
* 'http://google.com/someimage.jpg',
* callback);
*
* function callback(texture, exception) {
* if (!exception) {
* g_mySampler.texture = texture;
* } else {
* alert(exception);
* }
* }
* </pre>
*
*
* @param {!o3d.Pack} pack Pack to load texture into.
* @param {string} url URL of texture to load.
* @param {!function(o3d.Texture, *): void} callback Callback when
* texture is loaded. It will be passed the texture and an exception on
* error or null on success.
* @param {boolean} opt_generateMips Generate Mips. Default = true.
* @param {boolean} opt_flip Flip texture. Default = true.
* @return {!o3djs.io.LoadInfo} A LoadInfo to track progress.
* @see o3djs.io.loadBitmaps
* @see o3djs.loader.createLoader
*/
o3djs.io.loadTexture = function(
pack, url, callback, opt_generateMips, opt_flip) {
function onLoaded(request, rawData, exception) {
var texture = null;
if (!exception) {
texture = o3djs.texture.createTextureFromRawData(
pack, rawData, opt_generateMips, opt_flip);
pack.removeObject(request);
}
callback(texture, exception);
};
return o3djs.io.loadRawData(pack, url, onLoaded);
};