javascript
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three.js
镜像来自 https://github.com/tazdij/three.js.git


			
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		<h1>[name]</h1>

		<p class="desc">
			This buffer attribute class does not construct a VBO. Instead, it uses
			whatever VBO is passed in constructor and can later be altered via the
			*buffer* property.<br /><br />
			It is required to pass additional params alongside the VBO. Those are:
			the GL context, the GL data type, the number of components per vertex
			and the number of vertices.<br /><br />
			The most common use case for this class is when some kind of GPGPU
			calculation interferes or even produces the VBOs in question.
		</p>

		<h2>Constructor</h2>
		<h3>[name]( [param:WebGLRenderingContext gl], [param:WebGLBuffer buffer], [param:GLenum type], [param:Integer itemSize], [param:Integer count], [param:Boolean normalized] )</h3>
		<p>
		gl — Must be a [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext].
		<br />
		buffer — Must be a [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGLBuffer].
		<br />
		type — One of [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Constants#Data_types].
		<br />
		itemSize — The number of values of the array that should be associated with
		a particular vertex. For instance, if this
		attribute is storing a 3-component vector (such as a position, normal, or color), then itemSize should be 3.
		<br />
		count — The expected number of vertices in VBO.
		<br /><br />
		
		normalized — (optional) Applies to integer data only. Indicates how the underlying data
		in the buffer maps to the values in the GLSL code. For instance, if [page:TypedArray array] is an instance
		of UInt16Array, and [page:Boolean normalized] is true, the values 0 - +65535 in the array
		 data will be mapped to 0.0f - +1.0f in the GLSL attribute. An Int16Array (signed) would map
		 from -32767 - +32767  to -1.0f - +1.0f. If [page:Boolean normalized] is false, the values
		 will be converted to floats unmodified, i.e. 32767 becomes 32767.0f.
		</p>

		<h2>Properties</h2>

		<h3>[property:WebGLBuffer buffer]</h3>
		<p>
			The current <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGLBuffer" target="_blank">WebGLBuffer</a> instance.
		</p>

		<h3>[property:Integer count]</h3>
		<p>
			The expected number of vertices in VBO.
		</p>

		<h3>[property:Boolean normalized]</h3>
		<p>
		Indicates how the underlying data in the buffer maps to the values in the GLSL shader code.
		See the constructor above for details.
		</p>

		<h3>[property:Integer itemSize]</h3>
		<p>
			How many values make up each item (vertex).
		</p>

		<h3>[property:Integer elementSize]</h3>
		<p>
			Stores the corresponding size in bytes for the current *type* property value.
		</p>
		<p>
			<b>Don't touch</b>.
		</p>

		<h3>[property:GLenum type]</h3>
		<p>
			A <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Constants#Standard_WebGL_1_constants" target="_blank">WebGL Data Type</a> describing the underlying VBO contents.
		</p>
		<p>
			Setting this is only allowed with *setType*.
		</p>

		<h3>[property:Boolean isGLBufferAttribute]</h3>
		<p>
			Should be *true*.
		</p>

		<h2>Methods</h2>

		<h3>[method:null setBuffer]( buffer ) </h3>
		<p>Sets the *buffer* property.</p>

		<h3>[method:null setType]( type ) </h3>
		<p>Sets the *type* property.</p>

		<h3>[method:null setItemSize]( itemSize ) </h3>
		<p>Sets the *itemSize* property.</p>

		<h3>[method:null setCount]( count ) </h3>
		<p>Sets the *count* property.</p>


		<h2>Source</h2>

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