title: OpenGL ES - Get current blendFunc
body: <p>I want to do something like this:</p>
  
  <pre><code>currentBlendFunc = glGetCurrentBlendFunc();
  glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  
  // [...] do stuff
  
  glBlendFunc(currentBlendFunc.src, currentBlendFunc.dest);
  </code></pre>
  
  <p>Is there a way to get the current blend func?</p>