title: flat-surface-shader can't moved by WebGL mode
body: <p>I use <a href="http://matthew.wagerfield.com/flat-surface-shader/" rel="nofollow">flat-surface-shader</a> </p>
  
  <p>Chrome and Firefox moved, but Safari8 and iOS8 Safari can't move flat-surface-shader.</p>
  
  <p>[Warning] WebGL: INVALID_OPERATION: drawArrays: attempt to access out of bounds arrays </p>
  
  <p>[Warning] WebGL: INVALID_VALUE: bufferData: size == 0 (scripts.js, line 1607, x4)</p>
  
  <p>[Warning] WebGL: too many errors, no more errors will be reported to the console for this context. (scripts.js, line 1607)</p>
  
  <p>I want to move flat-surface-shader. </p>
  
  <p>Please help me if you know how to do it.</p>