title: Multiple glPrimitiveRestartIndex calls
body: <p>I've loaded to my vertex array multiple polygons which I want to draw with GL_TRIANGLE_FAN.
  I'm trying to performe this using a single call to glDrawArrays and also using glPrimitiveRestartIndex, to specify where a new polygon starts.
  Can I call glPrimitiveRestartIndex multiple times? For example, if I have loaded 3 polygons of 8 vertex each (24 vertex in total). Can I do something like this:</p>
  
  <pre><code>glPrimitiveRestartIndex(8);
  glPrimitiveRestartIndex(16);
  </code></pre>
  
  <p>And then call glDrawArrays?
  It seems not to work. It seems OpenGL just take into account the last call to glPrimitiveRestartIndex.</p>