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model.js
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156 lines (135 loc) · 5.06 KB
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import { path } from '../core/path.js';
import { http, Http } from '../net/http.js';
import { GlbModelParser } from './parser/glb-model.js';
import { JsonModelParser } from './parser/json-model.js';
/**
* @class
* @name ModelHandler
* @implements {ResourceHandler}
* @classdesc Resource handler used for loading {@link Model} resources.
* @param {GraphicsDevice} device - The graphics device that will be rendering.
* @param {StandardMaterial} defaultMaterial - The shared default material that is used in any place that a material is not specified.
*/
class ModelHandler {
constructor(device, defaultMaterial) {
this._device = device;
this._parsers = [];
this._defaultMaterial = defaultMaterial;
this.maxRetries = 0;
this.addParser(new JsonModelParser(this._device), function (url, data) {
return (path.getExtension(url) === '.json');
});
this.addParser(new GlbModelParser(this._device), function (url, data) {
return (path.getExtension(url) === '.glb');
});
}
load(url, callback) {
if (typeof url === 'string') {
url = {
load: url,
original: url
};
}
// we need to specify JSON for blob URLs
var options = {
retry: this.maxRetries > 0,
maxRetries: this.maxRetries
};
if (url.load.startsWith('blob:') || url.load.startsWith('data:')) {
if (path.getExtension(url.original).toLowerCase() === '.glb') {
options.responseType = Http.ResponseType.ARRAY_BUFFER;
} else {
options.responseType = Http.ResponseType.JSON;
}
}
http.get(url.load, options, function (err, response) {
if (!callback)
return;
if (!err) {
callback(null, response);
} else {
callback("Error loading model: " + url.original + " [" + err + "]");
}
});
}
open(url, data) {
for (var i = 0; i < this._parsers.length; i++) {
var p = this._parsers[i];
if (p.decider(url, data)) {
return p.parser.parse(data);
}
}
// #ifdef DEBUG
console.warn("pc.ModelHandler#open: No model parser found for: " + url);
// #endif
return null;
}
patch(asset, assets) {
if (!asset.resource)
return;
var data = asset.data;
var self = this;
asset.resource.meshInstances.forEach(function (meshInstance, i) {
if (data.mapping) {
var handleMaterial = function (asset) {
if (asset.resource) {
meshInstance.material = asset.resource;
} else {
asset.once('load', handleMaterial);
assets.load(asset);
}
asset.once('remove', function (asset) {
if (meshInstance.material === asset.resource) {
meshInstance.material = self._defaultMaterial;
}
});
};
if (!data.mapping[i]) {
meshInstance.material = self._defaultMaterial;
return;
}
var id = data.mapping[i].material;
var url = data.mapping[i].path;
var material;
if (id !== undefined) { // id mapping
if (!id) {
meshInstance.material = self._defaultMaterial;
} else {
material = assets.get(id);
if (material) {
handleMaterial(material);
} else {
assets.once('add:' + id, handleMaterial);
}
}
} else if (url) {
// url mapping
var path = asset.getAbsoluteUrl(data.mapping[i].path);
material = assets.getByUrl(path);
if (material) {
handleMaterial(material);
} else {
assets.once('add:url:' + path, handleMaterial);
}
}
}
});
}
/**
* @function
* @name ModelHandler#addParser
* @description Add a parser that converts raw data into a {@link Model}
* Default parser is for JSON models.
* @param {object} parser - See JsonModelParser for example.
* @param {callbacks.AddParser} decider - Function that decides on which parser to use.
* Function should take (url, data) arguments and return true if this parser should be used to parse the data into a {@link Model}.
* The first parser to return true is used.
*/
addParser(parser, decider) {
this._parsers.push({
parser: parser,
decider: decider
});
}
}
export { ModelHandler };