title: How does vectors multiply act in shader language?
body: <p>Such as <code>gl_FragColor = v1 * v2</code>, i can't really get how does it multiplies and it seems that the reference give the explanation of vector multiply matrix.<br>
  ps: The type of <code>v1</code> and <code>v2</code> are both <code>vec4</code>.</p>