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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

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.


void gl.readBuffer(src);


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





Specification Status Comment
WebGL 2.0
The definition of 'readBuffer' in that specification.
Editor's Draft Initial definition for WebGL.
OpenGL ES 3.0
The definition of 'glReadBuffer' in that specification.
Standard Man page of the (similar) OpenGL API.

Browser compatibility

FeatureChromeFirefoxEdgeInternet ExplorerOperaSafari
Basic Support5651.0(No)(No)43(No)
FeatureAndroidChrome for AndroidEdge mobileFirefox for AndroidIE mobileOpera AndroidiOS Safari
Basic Support(No)(No)(No)(No)(No)(No)(No)

See also

Document Tags and Contributors

 Contributors to this page: fscholz, teoli
 Last updated by: fscholz,