web api instance method

WebGLRenderingContext: bufferSubData() method

Available in workers

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

Syntax

bufferSubData(target, offset)
bufferSubData(target, offset, srcData)

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.
offset
- : A GLintptr specifying an offset in bytes where the data replacement will start.
srcData Optional
- : A TypedArray or a DataView that views an ArrayBuffer or SharedArrayBuffer that will be copied into the data store.

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.

Examples

Using `bufferSubData`

const canvas = document.getElementById("canvas");
const gl = canvas.getContext("webgl");
const buffer = gl.createBuffer();
const data = new Float32Array([1, 2, 3, 4]);
gl.bindBuffer(gl.ARRAY_BUFFER, buffer);
gl.bufferData(gl.ARRAY_BUFFER, 1024, gl.STATIC_DRAW);
gl.bufferSubData(gl.ARRAY_BUFFER, 512, data);

Specifications

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.