forked from eordano/gltf-pipeline
-
Notifications
You must be signed in to change notification settings - Fork 3
/
readResources.js
153 lines (133 loc) · 5.53 KB
/
readResources.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
'use strict';
const Cesium = require('cesium');
const fsExtra = require('fs-extra');
const path = require('path');
const Promise = require('bluebird');
const { URL } = require('url');
const addPipelineExtras = require('./addPipelineExtras');
const dataUriToBuffer = require('./dataUriToBuffer');
const { fileURLToPath, pathToFileURL } = require('./FileUrl');
const ForEach = require('./ForEach');
const defined = Cesium.defined;
const defaultValue = Cesium.defaultValue;
const isDataUri = Cesium.isDataUri;
const RuntimeError = Cesium.RuntimeError;
module.exports = readResources;
/**
* Read data uris, buffer views, or files referenced by the glTF into buffers.
* The buffer data is placed into extras._pipeline.source for the corresponding object.
* This stage runs before updateVersion and handles both glTF 1.0 and glTF 2.0 assets.
*
* @param {Object} gltf A javascript object containing a glTF asset.
* @param {Object} [options] Object with the following properties:
* @param {String} [options.resourceDirectory] The path to look in when reading separate files.
* @returns {Promise} A promise that resolves to the glTF asset when all resources are read.
*
* @private
*/
function readResources(gltf, options) {
addPipelineExtras(gltf);
options = defaultValue(options, {});
// Make sure its an absolute path with a trailing separator
options.resourceDirectory = defined(options.resourceDirectory) ?
(path.resolve(options.resourceDirectory) + path.sep) : undefined;
const bufferPromises = [];
const resourcePromises = [];
ForEach.buffer(gltf, function(buffer) {
bufferPromises.push(readBuffer(gltf, buffer, options));
});
// Buffers need to be read first because images and shader may resolve to bufferViews
return Promise.all(bufferPromises)
.then(function() {
ForEach.shader(gltf, function (shader) {
resourcePromises.push(readShader(gltf, shader, options));
});
ForEach.image(gltf, function (image) {
resourcePromises.push(readImage(gltf, image, options));
ForEach.compressedImage(image, function(compressedImage) {
resourcePromises.push(readImage(gltf, compressedImage, options));
});
});
return Promise.all(resourcePromises);
})
.then(function() {
return gltf;
});
}
function readBuffer(gltf, buffer, options) {
return readResource(gltf, buffer, false, options)
.then(function(data) {
buffer.extras._pipeline.source = data;
});
}
function readImage(gltf, image, options) {
return readResource(gltf, image, true, options)
.then(function(data) {
image.extras._pipeline.source = data;
});
}
function readShader(gltf, shader, options) {
return readResource(gltf, shader, true, options)
.then(function(data) {
shader.extras._pipeline.source = data.toString();
});
}
function readResource(gltf, object, saveResourceId, options) {
const uri = object.uri;
delete object.uri; // Don't hold onto the uri, its contents will be stored in extras._pipeline.source
// Source already exists if the gltf was converted from a glb
const source = object.extras._pipeline.source;
if (defined(source)) {
return Promise.resolve(Buffer.from(source));
}
// Handle reading buffer view from 1.0 glb model
const extensions = object.extensions;
if (defined(extensions)) {
const khrBinaryGltf = extensions.KHR_binary_glTF;
if (defined(khrBinaryGltf)) {
return Promise.resolve(readBufferView(gltf, khrBinaryGltf.bufferView, object, saveResourceId));
}
}
if (defined(object.bufferView)) {
return Promise.resolve(readBufferView(gltf, object.bufferView, object, saveResourceId));
}
if (isDataUri(uri)) {
return Promise.resolve(dataUriToBuffer(uri));
}
return readFile(object, uri, saveResourceId, options);
}
function readBufferView(gltf, bufferViewId, object, saveResourceId) {
if (saveResourceId) {
object.extras._pipeline.resourceId = bufferViewId;
}
const bufferView = gltf.bufferViews[bufferViewId];
const buffer = gltf.buffers[bufferView.buffer];
const source = buffer.extras._pipeline.source;
const byteOffset = defaultValue(bufferView.byteOffset, 0);
return source.slice(byteOffset, byteOffset + bufferView.byteLength);
}
function readFile(object, uri, saveResourceId, options) {
const resourceDirectory = options.resourceDirectory;
const hasResourceDirectory = defined(resourceDirectory);
// Resolve the URL
let absoluteUrl;
try {
absoluteUrl = new URL(uri,
hasResourceDirectory ? pathToFileURL(resourceDirectory) : undefined);
} catch(error) {
return Promise.reject(new RuntimeError('glTF model references separate files but no resourceDirectory is supplied'));
}
// Generate file paths for the resource
const absolutePath = fileURLToPath(absoluteUrl);
const relativePath = hasResourceDirectory ? path.relative(resourceDirectory, absolutePath) : path.basename(absolutePath);
if (!defined(object.name)) {
const extension = path.extname(relativePath);
object.name = path.basename(relativePath, extension);
}
if (saveResourceId) {
object.extras._pipeline.resourceId = absolutePath;
}
object.extras._pipeline.absolutePath = absolutePath;
object.extras._pipeline.relativePath = relativePath;
return fsExtra.readFile(absolutePath);
}