title: How to read webgl GL.bufferData in javascript
body: <p>i want to read back the data stored in the GL.bufferData array in javascript.</p>
  
  <p>Here is my code</p>
  
  <p><code>var TRIANGLE_VERTEX = geometryNode["triangle_buffer"];
  GL.bindBuffer(GL.ARRAY_BUFFER, TRIANGLE_VERTEX);
  GL.bufferData(GL.ARRAY_BUFFER,new Float32Array(vertices),GL.STATIC_DRAW);</code></p>
  
  <p>is it possible in webgl to read back the bufferdata in GPU?
  if possible then please explain me with a sample code.</p>
  
  <p>How to know the memory size(filled and free) of the Gpu in webgl at run time and how to debug the shader code and data in GPU in webgl.</p>