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set lookat matrix in OpenGL ES 2.0

OpenGL ES 2.0 deprecate the GLU tools, we have following codes to replace the functionality of the tool gluLookAt(). 
  

  

  
  

  

    

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      Jean Yang
    


    

      
      
      

        

          

            

              
Added following judgement to make sure the up vector not parallel to forward line.



    //The UP vector must not be parallel to the line of sight from the eye point to the reference point.

    if((0 == sx)&&(0 == sy)&&(0 == sz))

     return;