WebGL2RenderingContext: bufferSubData() method

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2021.

Note: This feature is available in Web Workers.

The WebGL2RenderingContext.bufferSubData() method of the WebGL API updates a subset of a buffer object's data store.

Syntax

bufferSubData(target, dstByteOffset, srcData)
bufferSubData(target, dstByteOffset, srcData, srcOffset)
bufferSubData(target, dstByteOffset, srcData, 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.

dstByteOffset

A GLintptr specifying an offset in bytes where the data replacement will start.

srcData Optional

An ArrayBuffer, SharedArrayBuffer, a DataView, or a TypedArray that will be copied into the data store.

srcOffset Optional

A GLuint specifying the element index offset where to start reading the buffer.

length Optional

A GLuint defaulting to 0, where 0 means bufferSubData should calculate the length.

Return value

None (undefined).

Exceptions

A gl.INVALID_VALUE error is thrown if the data would be written past the end of the buffer or if data is null.
A gl.INVALID_ENUM error is thrown if target is not one of the allowed enums.

Specifications

Specification
WebGL Specification # 5.14.5

Browser compatibility

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