     m = 4
     colorname = prefix + '_color'
     alphaname = prefix + '_alpha'
-    
+
     if not visual.doit
       # Don't draw (draw transparent)
       vbo.used = false

                  d = max(d, min(abs(x.x),abs(x.y)));
              */
          }
          
          return d;
      }



      # Init array of implicit shape nx2
      n = @nvertices
      _x = new Float64Array(@glyph._x)
      _y = new Float64Array(@glyph._y)

      # Init vertex data
      V_position = Vp = new Float32Array(n*2)
