[name]

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.

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.

The most common use case for this class is when some kind of GPGPU calculation interferes or even produces the VBOs in question.

Constructor

[name]( [param:WebGLRenderingContext gl], [param:WebGLBuffer buffer], [param:GLenum type], [param:Integer itemSize], [param:Integer count], [param:Boolean normalized] )

gl — Must be a [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGLRenderingContext].
buffer — Must be a [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGLBuffer].
type — One of [link:https://developer.mozilla.org/en-US/docs/Web/API/WebGL_API/Constants#Data_types].
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.
count — The expected number of vertices in VBO.

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.

Properties

[property:WebGLBuffer buffer]

The current WebGLBuffer instance.

[property:Integer count]

The expected number of vertices in VBO.

[property:Boolean normalized]

Indicates how the underlying data in the buffer maps to the values in the GLSL shader code. See the constructor above for details.

[property:Integer itemSize]

How many values make up each item (vertex).

[property:Integer elementSize]

Stores the corresponding size in bytes for the current *type* property value.

Don't touch.

[property:GLenum type]

A WebGL Data Type describing the underlying VBO contents.

Setting this is only allowed with *setType*.

[property:Boolean isGLBufferAttribute]

Should be *true*.

Methods

[method:null setBuffer]( buffer )

Sets the *buffer* property.

[method:null setType]( type )

Sets the *type* property.

[method:null setItemSize]( itemSize )

Sets the *itemSize* property.

[method:null setCount]( count )

Sets the *count* property.

Source