content:     // C function EGLSurface eglCreateWindowSurface ( EGLDisplay dpy, EGLConfig config, EGLNativeWindowType win, const EGLint *attrib_list )
  
      private static native EGLSurface _eglCreateWindowSurface(
          EGLDisplay dpy,
          EGLConfig config,
          Object win,
          int[] attrib_list,
          int offset
      );
  
      private static native EGLSurface _eglCreateWindowSurfaceTexture(
          EGLDisplay dpy,
          EGLConfig config,
          Object win,
          int[] attrib_list,
          int offset
      );
  
      public static EGLSurface eglCreateWindowSurface(EGLDisplay dpy,
          EGLConfig config,
          Object win,
          int[] attrib_list,
          int offset
      ){
          Surface sur = null;
          if (win instanceof SurfaceView) {
              SurfaceView surfaceView = (SurfaceView)win;
              sur = surfaceView.getHolder().getSurface();
          } else if (win instanceof SurfaceHolder) {
              SurfaceHolder holder = (SurfaceHolder)win;
              sur = holder.getSurface();
          } else if (win instanceof Surface) {
              sur = (Surface) win;
          }
  
          EGLSurface surface;
          if (sur != null) {
              surface = _eglCreateWindowSurface(dpy, config, sur, attrib_list, offset);
          } else if (win instanceof SurfaceTexture) {
              surface = _eglCreateWindowSurfaceTexture(dpy, config,
                      win, attrib_list, offset);
          } else {
              throw new java.lang.UnsupportedOperationException(
                  "eglCreateWindowSurface() can only be called with an instance of " +
                  "Surface, SurfaceView, SurfaceTexture or SurfaceHolder at the moment, " +
                  "this will be fixed later.");
          }
  
          return surface;
      }
  