WebGL2RenderingContext: readBuffer() 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.readBuffer() method of the WebGL 2 API selects a color buffer as the source for pixels for subsequent calls to copyTexImage2D, copyTexSubImage2D, copyTexSubImage3D or readPixels.

Syntax

js
readBuffer(source)

Parameters

source

A GLenum specifying a color buffer. Possible values:

gl.BACK

Reads from the back color buffer.

gl.NONE

Reads from no color buffer.

gl.COLOR_ATTACHMENT{0-15}

Reads from one of the 16 color attachment buffers.

Return value

None (undefined).

Examples

js
gl.readBuffer(gl.COLOR_ATTACHMENT0);

Specifications

Specification
WebGL 2.0 Specification
# 3.7.4

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
readBuffer

Legend

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Full support
Full support

See also