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.

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.

readBuffer(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.