title: GLFW get screen height/width?
body: <p>Playing around with OpenGL for a while, using the freeglut library, I decided that I will use GLFW for my next training project instead, since I was told that GLUT was only designed for learning purposes and should not be used professionally. I had no problems with linking the lib to my NetBeans project and it compiles just fine, using mingw32 4.6.2. </p>
  
  <p>However, I am running into difficulties trying to position the window at the center of the screen. 
  Under freeglut, I previously used:</p>
  
  <pre><code>glutInitWindowPosition ( 
                           (glutGet(GLUT_SCREEN_WIDTH)-RES_X)  / 2,
                           (glutGet(GLUT_SCREEN_HEIGHT)-RES_Y) / 2 
                         );
  </code></pre>
  
  <p>I can't find any glfw function that would return the screen size or width. Is such a function simply not implemented?</p>