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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, the
- number of bytes per component, 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:WebGLBuffer buffer], [param:GLenum type], [param:Integer itemSize], [param:Integer elementSize], [param:Integer count] )</h3>
- <p>
- `buffer` — Must be a
- [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGLBuffer WebGLBuffer].
- <br />
- `type` — One of
- [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Constants#Data_types WebGL 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 />
- `elementSize` — 1, 2 or 4. The corresponding size (in bytes) for the given
- "type" param.
- </p>
- <ul>
- <li>gl.FLOAT: 4</li>
- <li>gl.UNSIGNED_SHORT: 2</li>
- <li>gl.SHORT: 2</li>
- <li>gl.UNSIGNED_INT: 4</li>
- <li>gl.INT: 4</li>
- <li>gl.BYTE: 1</li>
- <li>gl.UNSIGNED_BYTE: 1</li>
- </ul>
- `count` — The expected number of vertices in VBO.
- <h2>Properties</h2>
- <h3>[property:WebGLBuffer buffer]</h3>
- <p>
- The current
- [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGLBuffer WebGLBuffer] instance.
- </p>
- <h3>[property:Integer count]</h3>
- <p>The expected number of vertices in VBO.</p>
- <h3>[property:Boolean isGLBufferAttribute]</h3>
- <p>Read-only. Always `true`.</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>See above (constructor) for a list of known type sizes.</p>
- <h3>[property:String name]</h3>
- <p>
- Optional name for this attribute instance. Default is an empty string.
- </p>
- <h3>[property:GLenum type]</h3>
- <p>
- A
- [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Constants#Data_types WebGL Data Type] describing the underlying VBO contents.
- </p>
- <p>
- Set this property together with `elementSize`. The recommended way is
- using the `setType` method.
- </p>
- <h2>Methods</h2>
- <h3>[method:this setBuffer]( buffer )</h3>
- <p>Sets the `buffer` property.</p>
- <h3>[method:this setType]( type, elementSize )</h3>
- <p>Sets the both `type` and `elementSize` properties.</p>
- <h3>[method:this setItemSize]( itemSize )</h3>
- <p>Sets the `itemSize` property.</p>
- <h3>[method:this setCount]( count )</h3>
- <p>Sets the `count` property.</p>
- <h3>[property:Integer version]</h3>
- <p>
- A version number, incremented every time the needsUpdate property is set
- to true.
- </p>
- <h3>[property:Boolean needsUpdate]</h3>
- <p>
- Default is `false`. Setting this to true increments
- [page:GLBufferAttribute.version version].
- </p>
- <h2>Source</h2>
- <p>
- [link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
- </p>
- </body>
- </html>
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