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);
srcGLenum 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.None.
gl.readBuffer(gl.COLOR_ATTACHMENT0);
| 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. |
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | Servo |
|---|---|---|---|---|---|---|---|
| Basic Support | 56 | No support | 51.0 | No support | 43 | No support | No support |
| Feature | Android | Chrome for Android | Edge Mobile | Firefox for Android | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|---|
| Basic Support | No support | No support | No support | No support | No support | No support | No support |
WebGLRenderingContext.copyTexImage2D()WebGLRenderingContext.copyTexSubImage2D()WebGL2RenderingContext.copyTexSubImage3D()WebGLRenderingContext.readPixels()
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https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/readBuffer