javascript
/
three.js
cermin dari https://github.com/tazdij/three.js.git


			
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		[page:Loader] &rarr;

		<h1>[name]</h1>

		<p class="desc">
			一个把[page:Image]加载为[link:https://developer.mozilla.org/en-US/docs/Web/API/ImageBitmap ImageBitmap]的加载器。
			ImageBitmap提供了一种异步且有效的资源的途径，用于在WebGL中渲染的纹理。<br/>
			不像[page:FileLoader], [name]无需避免对同一的URL进行多次请求。
		</p>

		<p>
			Note that [page:Texture.flipY] and [page:Texture.premultiplyAlpha] with [link:https://developer.mozilla.org/en-US/docs/Web/API/ImageBitmap ImageBitmap] are ignored.
			[link:https://developer.mozilla.org/en-US/docs/Web/API/ImageBitmap ImageBitmap] needs these configuration on bitmap creation
			unlike regular images need them on uploading to GPU. You need to set the equivalent options via [page:ImageBitmapLoader.setOptions]
			instead. Refer to [link:https://www.khronos.org/registry/webgl/specs/latest/1.0/#6.10 WebGL specification] for the detail.
		</p>

		<h2>代码示例</h2>

		<code>
		// 初始化一个加载器
		const loader = new THREE.ImageBitmapLoader();

		// set options if needed
		loader.setOptions( { imageOrientation: 'flipY' } );

		// 加载一个图片资源
		loader.load(
			// 资源的URL
			'textures/skyboxsun25degtest.png',

			// onLoad回调
			function ( imageBitmap ) {
				const texture = new THREE.CanvasTexture( imageBitmap );
				const material = new THREE.MeshBasicMaterial( { map: texture } );
			},

			// 目前暂不支持onProgress的回调
			undefined,

			// onError回调
			function ( err ) {
				console.log( 'An error happened' );
			}
		);
		</code>

		<h2>例子</h2>

		<p>
			[example:webgl_loader_imagebitmap WebGL / loader / ImageBitmap]
		</p>

		<h2>构造函数</h2>

		<h3>[name]( [param:LoadingManager manager] )</h3>
		<p>
		[page:LoadingManager manager] — 加载器使用的[page:LoadingManager loadingManager]，默认为[page:LoadingManager THREE.DefaultLoadingManager].<br /><br />

		创建一个新的[name].
		</p>

		<h2>属性</h2>
		<p>共有属性请参见其基类[page:Loader]。</p>


		<h3>[property:String options]</h3>
		<p>一个可选对象，用来设置内部使用的[link:https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/createImageBitmap createImageBitmap]工厂方法，
			默认为*undefined*.</p>

		<h2>方法</h2>
		<p>共有方法请参见其基类[page:Loader]。</p>

		<h3>[method:null load]( [param:String url], [param:Function onLoad], [param:Function onProgress], [param:Function onError] )</h3>
		<p>
		[page:String url] — 文件的URL或者路径，也可以为
			[link:https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs Data URI].<br />
		[page:Function onLoad] — 加载完成时将调用。回调参数为将要加载的[page:Image image].<br />
		[page:Function onProgress] — 此回调函数暂时不支持<br />
		[page:Function onError] —  在加载错误时被调用。<br />
		</p>
		<p>
			从URL中进行加载，并返回将包含数据的[page:ImageBitmap image]对象。
		</p>

		<h3>[method:ImageBitmapLoader setOptions]( [param:Object options] )</h3>
		<p>
			设置[link:https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/createImageBitmap createImageBitmap]的选项对象。
		</p>

		<h2>源</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
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