title: Passing a list of values to fragment shader
body: <p>I want to send a list of values into a fragment shader. It is a possibly large (couple of thousand items long) list of single precision floats. The fragment shader needs random access to this list and I want to refresh the values from the CPU on each frame.</p>
  
  <p>I'm considering my options on how this could be done:</p>
  
  <ol>
  <li><p>As a uniform variable of array type ("uniform float x[10];"). But there seems to be limits here, on my GPU sending more than a few hundred values is very slow and also I'd have to hard-code the upper limit in the shader when I'd rather would like to change that in runtime.</p></li>
  <li><p>As a texture with height 1 and width of my list, then refresh the data using glCopyTexSubImage2D.</p></li>
  <li><p>Other methods? I haven't kept up with all the changes in the GL-specification lately, perhaps there is some other method that is specifically designed for this purpose?</p></li>
  </ol>