WebGL2RenderingContext: bufferData() method

Syntax

bufferData(target, size, usage)
bufferData(target, srcData, usage)
bufferData(target, srcData, usage, srcOffset)
bufferData(target, srcData, usage, srcOffset, length)

Parameters

target

A GLenum specifying the binding point (target). Possible values:

gl.ARRAY_BUFFER

Buffer containing vertex attributes, such as vertex coordinates, texture coordinate data, or vertex color data.

gl.ELEMENT_ARRAY_BUFFER

Buffer used for element indices.

gl.COPY_READ_BUFFER

Buffer for copying from one buffer object to another.

gl.COPY_WRITE_BUFFER

Buffer for copying from one buffer object to another.

gl.TRANSFORM_FEEDBACK_BUFFER

Buffer for transform feedback operations.

gl.UNIFORM_BUFFER

Buffer used for storing uniform blocks.

gl.PIXEL_PACK_BUFFER

Buffer used for pixel transfer operations.

gl.PIXEL_UNPACK_BUFFER

Buffer used for pixel transfer operations.

size Optional

A GLsizeiptr setting the size in bytes of the buffer object's data store. One of size and srcData must be provided.

srcData Optional

A TypedArray or a DataView that views an ArrayBuffer or SharedArrayBuffer that will be copied into the data store. If null, a data store is still created, but the content is uninitialized and undefined. One of size and srcData must be provided.

usage

A GLenum specifying the intended usage pattern of the data store for optimization purposes. Possible values:

gl.STATIC_DRAW

The contents are intended to be specified once by the application, and used many times as the source for WebGL drawing and image specification commands.

gl.DYNAMIC_DRAW

The contents are intended to be respecified repeatedly by the application, and used many times as the source for WebGL drawing and image specification commands.

gl.STREAM_DRAW

The contents are intended to be specified once by the application, and used at most a few times as the source for WebGL drawing and image specification commands.

gl.STATIC_READ

The contents are intended to be specified once by reading data from WebGL, and queried many times by the application.

gl.DYNAMIC_READ

The contents are intended to be respecified repeatedly by reading data from WebGL, and queried many times by the application.

gl.STREAM_READ

The contents are intended to be specified once by reading data from WebGL, and queried at most a few times by the application

gl.STATIC_COPY

The contents are intended to be specified once by reading data from WebGL, and used many times as the source for WebGL drawing and image specification commands.

gl.DYNAMIC_COPY

The contents are intended to be respecified repeatedly by reading data from WebGL, and used many times as the source for WebGL drawing and image specification commands.

gl.STREAM_COPY

The contents are intended to be specified once by reading data from WebGL, and used at most a few times as the source for WebGL drawing and image specification commands.

srcOffset Optional

A GLuint specifying the element index offset where to start reading the buffer. Only allowed if srcData is provided.

length Optional

A GLuint defaulting to 0. Only allowed if srcOffset is given.

Return value

None (undefined).

Exceptions

• A gl.OUT_OF_MEMORY error is thrown if the context is unable to create a data store with the given size.
• A gl.INVALID_VALUE error is thrown if size is negative.
• A gl.INVALID_ENUM error is thrown if target or usage are not one of the allowed enums.

Specifications

Browser compatibility

See also

• WebGLRenderingContext.bufferData()
• WebGLRenderingContext.createBuffer()
• WebGLRenderingContext.bufferSubData()
• Other buffers: WebGLFramebuffer, WebGLRenderbuffer