title: Bind Framebuffer or set ReadBuffer?
body: <p>I created a framebuffer:</p>
  
  <pre><code>glBindFramebuffer(GL.GL_FRAMEBUFFER, &amp;fbo);
  glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, rbo);
  </code></pre>
  
  <p>Is reading pixels from the framebuffer via</p>
  
  <pre><code>glBindFramebuffer(GL_FRAMEBUFFER, &amp;fbo);
  glReadPixels(0, 0, w, h, GL_RGBA, GL_FLOAT, &amp;data);
  </code></pre>
  
  <p>equivalent to</p>
  
  <pre><code>glReadBuffer(GL_COLOR_ATTACHMENT0);
  glReadPixels(0, 0, w, h, GL_RGBA, GL_FLOAT, &amp;data);
  </code></pre>
  
  <p>?</p>