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Better handling of encoding base64 uris

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This commit is contained in:
Sean Lilley 2017-03-17 15:44:01 -04:00
parent dea55fec0f
commit 0bf726cea7
8 changed files with 152 additions and 125 deletions
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68
lib/convert.js
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@ -6,8 +6,8 @@ var path = require('path');
var Promise = require('bluebird');
var createGltf = require('./gltf');
var loadObj = require('./obj');
var writeUris = require('./writeUris');
var fsExtraOutputFile = Promise.promisify(fsExtra.outputFile);
var fsExtraOutputJson = Promise.promisify(fsExtra.outputJson);
var defaultValue = Cesium.defaultValue;
@ -86,7 +86,7 @@ function convert(objPath, gltfPath, options) {
return createGltf(objData);
})
.then(function(gltf) {
return writeSeparateResources(gltf, gltfPath, separate, separateTextures);
return writeUris(gltf, gltfPath, separate, separateTextures);
})
.then(function(gltf) {
if (bypassPipeline) {
@ -97,73 +97,9 @@ function convert(objPath, gltfPath, options) {
});
}
function deleteExtras(gltf) {
var buffer = gltf.buffers[Object.keys(gltf.buffers)[0]];
delete buffer.extras;
var images = gltf.images;
for (var id in images) {
if (images.hasOwnProperty(id)) {
var image = images[id];
delete image.extras;
}
}
}
function writeSeparateBuffer(gltf, gltfPath) {
var buffer = gltf.buffers[Object.keys(gltf.buffers)[0]];
var source = buffer.extras._obj2gltf.source;
var bufferName = path.basename(gltfPath, path.extname(gltfPath));
var bufferUri = bufferName + '.bin';
buffer.uri = bufferUri;
var bufferPath = path.join(path.dirname(gltfPath), bufferUri);
return convert._outputFile(bufferPath, source);
}
function writeSeparateTextures(gltf, gltfPath) {
var promises = [];
var images = gltf.images;
for (var id in images) {
if (images.hasOwnProperty(id)) {
var image = images[id];
var extras = image.extras._obj2gltf;
var imageUri = image.name + extras.extension;
image.uri = imageUri;
var imagePath = path.join(path.dirname(gltfPath), imageUri);
promises.push(convert._outputFile(imagePath, extras.source));
}
}
return Promise.all(promises);
}
function writeSeparateResources(gltf, gltfPath, separate, separateTextures) {
var promises = [];
var buffer = gltf.buffers[Object.keys(gltf.buffers)[0]];
if (separate || !defined(buffer.uri)) {
promises.push(writeSeparateBuffer(gltf, gltfPath));
}
if (separateTextures) {
promises.push(writeSeparateTextures(gltf, gltfPath));
}
deleteExtras(gltf);
return Promise.all(promises)
.then(function() {
return gltf;
});
}
/**
* Exposed for testing
*
* @private
*/
convert._outputJson = fsExtraOutputJson;
/**
* Exposed for testing
*
* @private
*/
convert._outputFile = fsExtraOutputFile;

10
lib/gltf.js
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@ -137,10 +137,9 @@ function createGltf(objData) {
gltf.images[imageId] = {
name : imageId,
uri : image.uri,
extras : {
_obj2gltf : {
source : image.data,
source : image.source,
extension : image.extension
}
}
@ -317,15 +316,8 @@ function createGltf(objData) {
buffers = buffers.concat(vertexBuffers, indexBuffers);
var buffer = Buffer.concat(buffers);
// Buffers larger than ~192MB cannot be base64 encoded due to a NodeJS limitation. Source: https://github.com/nodejs/node/issues/4266
var bufferUri;
if (buffer.length <= 201326580) {
bufferUri = 'data:application/octet-stream;base64,' + buffer.toString('base64');
}
gltf.buffers[bufferId] = {
byteLength : buffer.byteLength,
uri : bufferUri,
extras : {
_obj2gltf : {
source : buffer

19
lib/image.js
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@ -23,14 +23,11 @@ function loadImage(imagePath) {
return fsReadFile(imagePath)
.then(function(data) {
var extension = path.extname(imagePath);
var uriType = getUriType(extension);
var uri = uriType + ';base64,' + data.toString('base64');
var info = {
transparent : false,
data : data,
uri : uri,
format : getFormat(3),
source : data,
extension : extension
};
@ -81,20 +78,6 @@ function getChannels(colorType) {
}
}
function getUriType(extension) {
switch (extension) {
case '.png':
return 'data:image/png';
case '.jpg':
case '.jpeg':
return 'data:image/jpeg';
case '.gif':
return 'data:image/gif';
default:
return 'data:image/' + extension.slice(1);
}
}
function getFormat(channels) {
switch (channels) {
case 1:

126
lib/writeUris.js Normal file
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@ -0,0 +1,126 @@
'use strict';
var fsExtra = require('fs-extra');
var mime = require('mime');
var path = require('path');
var Promise = require('bluebird');
var fsExtraOutputFile = Promise.promisify(fsExtra.outputFile);
module.exports = writeUris;
/**
* Write glTF resources as embedded data uris or external files.
*
* @param {Object} gltf The glTF asset.
* @param {String} gltfPath Path where the glTF will be saved.
* @param {Boolean} separateBuffers Writes out separate buffers.
* @param {Boolean} separateTextures Writes out separate textures.
* @returns {Promise} A promise that resolves to the glTF asset.
*
* @private
*/
function writeUris(gltf, gltfPath, separateBuffers, separateTextures) {
var promises = [];
var buffer = gltf.buffers[Object.keys(gltf.buffers)[0]];
var bufferByteLength = buffer.extras._obj2gltf.source.length;
var texturesByteLength = 0;
var images = gltf.images;
for (var id in images) {
if (images.hasOwnProperty(id)) {
texturesByteLength += images[id].extras._obj2gltf.source.length;
}
}
// Buffers larger than ~192MB cannot be base64 encoded due to a NodeJS limitation. Source: https://github.com/nodejs/node/issues/4266
var exceedsMaximum = (texturesByteLength + bufferByteLength > 201326580);
if (exceedsMaximum) {
console.log('Buffers and textures are too large to encode in the glTF, saving as separate resources.');
}
if (separateBuffers || exceedsMaximum) {
promises.push(writeSeparateBuffer(gltf, gltfPath));
} else {
writeEmbeddedBuffer(gltf);
}
if (separateTextures || exceedsMaximum) {
promises.push(writeSeparateTextures(gltf, gltfPath));
} else {
writeEmbeddedTextures(gltf);
}
deleteExtras(gltf);
return Promise.all(promises)
.then(function() {
return gltf;
});
}
function deleteExtras(gltf) {
var buffer = gltf.buffers[Object.keys(gltf.buffers)[0]];
delete buffer.extras;
var images = gltf.images;
for (var id in images) {
if (images.hasOwnProperty(id)) {
var image = images[id];
delete image.extras;
}
}
}
function writeSeparateBuffer(gltf, gltfPath) {
var buffer = gltf.buffers[Object.keys(gltf.buffers)[0]];
var source = buffer.extras._obj2gltf.source;
var bufferName = path.basename(gltfPath, path.extname(gltfPath));
var bufferUri = bufferName + '.bin';
buffer.uri = bufferUri;
var bufferPath = path.join(path.dirname(gltfPath), bufferUri);
return writeUris._outputFile(bufferPath, source);
}
function writeSeparateTextures(gltf, gltfPath) {
var promises = [];
var images = gltf.images;
for (var id in images) {
if (images.hasOwnProperty(id)) {
var image = images[id];
var extras = image.extras._obj2gltf;
var imageUri = image.name + extras.extension;
image.uri = imageUri;
var imagePath = path.join(path.dirname(gltfPath), imageUri);
promises.push(writeUris._outputFile(imagePath, extras.source));
}
}
return Promise.all(promises);
}
function writeEmbeddedBuffer(gltf) {
var buffer = gltf.buffers[Object.keys(gltf.buffers)[0]];
var source = buffer.extras._obj2gltf.source;
buffer.uri = 'data:application/octet-stream;base64,' + source.toString('base64');
}
function writeEmbeddedTextures(gltf) {
var promises = [];
var images = gltf.images;
for (var id in images) {
if (images.hasOwnProperty(id)) {
var image = images[id];
var extras = image.extras._obj2gltf;
image.uri = 'data:' + mime.lookup(extras.extension) + ';base64,' + extras.source.toString('base64');
}
}
return Promise.all(promises);
}
/**
* Exposed for testing
*
* @private
*/
writeUris._outputFile = fsExtraOutputFile;

1
package.json
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@ -31,6 +31,7 @@
"event-stream": "^3.3.4",
"fs-extra": "^2.0.0",
"gltf-pipeline": "^0.1.0-alpha11",
"mime": "^1.3.4",
"pngjs": "^3.0.1",
"yargs": "^7.0.1"
},

4
specs/lib/convertSpec.js
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@ -1,8 +1,8 @@
'use strict';
var fsExtra = require('fs-extra');
var GltfPipeline = require('gltf-pipeline').Pipeline;
var path = require('path');
var convert = require('../../lib/convert');
var writeUris = require('../../lib/writeUris');
var objPath = 'specs/data/box-textured/box-textured.obj';
var gltfPath = 'specs/data/box-textured/box-textured.gltf';
@ -48,7 +48,7 @@ describe('convert', function() {
it('sets options', function(done) {
var spy1 = spyOn(GltfPipeline, 'processJSONToDisk');
var spy2 = spyOn(convert, '_outputFile');
var spy2 = spyOn(writeUris, '_outputFile');
var textureCompressionOptions = {
format : 'dxt1',
quality : 10

21
specs/lib/gltfSpec.js
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@ -7,6 +7,7 @@ var clone = require('../../lib/clone.js');
var createGltf = require('../../lib/gltf.js');
var loadImage = require('../../lib/image.js');
var loadObj = require('../../lib/obj.js');
var writeUris = require('../../lib/writeUris.js');
var WebGLConstants = Cesium.WebGLConstants;
@ -19,19 +20,6 @@ var groupGltfUrl = 'specs/data/box-objects-groups-materials/box-objects-groups-m
var diffuseTextureUrl = 'specs/data/box-textured/cesium.png';
var transparentDiffuseTextureUrl = 'specs/data/box-complex-material/diffuse.png';
function deleteExtras(gltf) {
var buffer = gltf.buffers[Object.keys(gltf.buffers)[0]];
delete buffer.extras;
var images = gltf.images;
for (var id in images) {
if (images.hasOwnProperty(id)) {
var image = images[id];
delete image.extras;
}
}
}
describe('gltf', function() {
var boxObjData;
var groupObjData;
@ -72,14 +60,14 @@ describe('gltf', function() {
it('simple gltf', function() {
var objData = clone(boxObjData, true);
var gltf = createGltf(objData);
deleteExtras(gltf);
writeUris(gltf, boxGltfUrl, false, false);
expect(gltf).toEqual(boxGltf);
});
it('multiple nodes, meshes, and primitives', function() {
var objData = clone(groupObjData, true);
var gltf = createGltf(objData);
deleteExtras(gltf);
writeUris(gltf, groupGltfUrl, false, false);
expect(gltf).toEqual(groupGltf);
expect(Object.keys(gltf.materials).length).toBe(3);
@ -141,7 +129,8 @@ describe('gltf', function() {
expect(image).toBeDefined();
expect(image.name).toBe('cesium');
expect(image.uri.indexOf('data:image/png;base64,') >= 0).toBe(true);
expect(image.extras._obj2gltf.source).toBeDefined();
expect(image.extras._obj2gltf.extension).toBe('.png');
expect(gltf.samplers.sampler).toEqual({
magFilter : WebGLConstants.LINEAR,

28
specs/lib/imageSpec.js
View File

@ -19,9 +19,9 @@ describe('image', function() {
expect(loadImage(pngImage)
.then(function(info) {
expect(info.transparent).toBe(false);
expect(info.data).toBeDefined();
expect(info.uri.indexOf('data:image/png') === 0).toBe(true);
expect(info.format).toBe(WebGLConstants.RGB);
expect(info.source).toBeDefined();
expect(info.extension).toBe('.png');
}), done).toResolve();
});
@ -29,9 +29,9 @@ describe('image', function() {
expect(loadImage(jpgImage)
.then(function(info) {
expect(info.transparent).toBe(false);
expect(info.data).toBeDefined();
expect(info.uri.indexOf('data:image/jpeg') === 0).toBe(true);
expect(info.format).toBe(WebGLConstants.RGB);
expect(info.source).toBeDefined();
expect(info.extension).toBe('.jpg');
}), done).toResolve();
});
@ -39,9 +39,9 @@ describe('image', function() {
expect(loadImage(jpegImage)
.then(function(info) {
expect(info.transparent).toBe(false);
expect(info.data).toBeDefined();
expect(info.uri.indexOf('data:image/jpeg') === 0).toBe(true);
expect(info.format).toBe(WebGLConstants.RGB);
expect(info.source).toBeDefined();
expect(info.extension).toBe('.jpeg');
}), done).toResolve();
});
@ -49,9 +49,9 @@ describe('image', function() {
expect(loadImage(gifImage)
.then(function(info) {
expect(info.transparent).toBe(false);
expect(info.data).toBeDefined();
expect(info.uri.indexOf('data:image/gif') === 0).toBe(true);
expect(info.format).toBe(WebGLConstants.RGB);
expect(info.source).toBeDefined();
expect(info.extension).toBe('.gif');
}), done).toResolve();
});
@ -59,9 +59,9 @@ describe('image', function() {
expect(loadImage(grayscaleImage)
.then(function(info) {
expect(info.transparent).toBe(false);
expect(info.data).toBeDefined();
expect(info.uri.indexOf('data:image/png') === 0).toBe(true);
expect(info.format).toBe(WebGLConstants.ALPHA);
expect(info.source).toBeDefined();
expect(info.extension).toBe('.png');
}), done).toResolve();
});
@ -69,9 +69,9 @@ describe('image', function() {
expect(loadImage(transparentImage)
.then(function(info) {
expect(info.transparent).toBe(true);
expect(info.data).toBeDefined();
expect(info.uri.indexOf('data:image/png') === 0).toBe(true);
expect(info.format).toBe(WebGLConstants.RGBA);
expect(info.source).toBeDefined();
expect(info.extension).toBe('.png');
}), done).toResolve();
});
@ -79,9 +79,9 @@ describe('image', function() {
expect(loadImage(opaqueAlphaImage)
.then(function(info) {
expect(info.transparent).toBe(false);
expect(info.data).toBeDefined();
expect(info.uri.indexOf('data:image/png') === 0).toBe(true);
expect(info.format).toBe(WebGLConstants.RGBA);
expect(info.source).toBeDefined();
expect(info.extension).toBe('.png');
}), done).toResolve();
});