title: OES_texture_float extension use
body: <p>How to use the OES_texture_float extension?
  I do not understand that it is necessary to specify the arguments the function texImage2D.</p>
  
  <pre><code>var fb=gl.createFramebuffer();
  gl.bindFramebuffer(gl.FRAMEBUFFER, fb);
  
  var rb=gl.createRenderbuffer();
  gl.bindRenderbuffer(gl.RENDERBUFFER, rb);
  gl.renderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16,size[0],size[1]);
  gl.framebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT,gl.RENDERBUFFER, rb);
  
  var texture=gl.createTexture();
  gl.bindTexture(gl.TEXTURE_2D, texture);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
  gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
  gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, size[0], size[1],0, gl.RGBA, ???, ???);
  
  gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0,gl.TEXTURE_2D, texture, 0);
  </code></pre>
  
  <p>What you need to write instead of "???"</p>