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  DC : HDC;   // Handle auf Zeichenfläche
  RC : HGLRC; // Rendering Context
  .
  .
  .

  DC:= Image1.Picture.Bitmap.Canvas.Handle;
  if not InitOpenGL then Application.Terminate;
  RC:= CreateRenderingContext( DC,
                               [opDoubleBuffered],
                               32,
                               24,
                               0,0,0,
                               0);
  ActivateRenderingContext(DC, RC);