This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
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 |
|---|---|---|---|---|---|---|
| Basic support | 56 | No | 51 | No | 43 | No |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
|---|---|---|---|---|---|---|---|
| Basic support | 58 | 58 | No | 51 | No | 43 | No |
WebGLRenderingContext.copyTexImage2D()WebGLRenderingContext.copyTexSubImage2D()WebGL2RenderingContext.copyTexSubImage3D()WebGLRenderingContext.readPixels()
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https://developer.mozilla.org/en-US/docs/Web/API/WebGL2RenderingContext/readBuffer