title: gl_fragColor with multiple textures
body: <p>I currently have two textures being applied to a single object.  Eventually there will be a couple more added to that, but I am having trouble getting the current two to work properly.</p>
  
  <p>At the moment, I am setting my fragcolor to the two images added together.  Literally all I am doing is something similar to :</p>
  
  <pre><code>gl_FragColor = texture1 + texture2;
  </code></pre>
  
  <p>I am sure there is a better way to do such things to begin with, but it also creates the problem that where the images overlap is added together (obviously), which is not what I am trying to do with my current project.  </p>
  
  <p>I am not sure if this is simply an issue with only my fragColor, where there's some built in function of GLSL to do something like this, or if I need to do something like combine the images before hand in some other fashion.</p>
  
  <p><strong>EDIT ::</strong>  Example of the color adding I meant : <a href="http://i.imgur.com/0vH4F.png" rel="nofollow">http://i.imgur.com/0vH4F.png</a></p>