code: def resize(self, shape, format=None):
          
          
          if not self._resizeable:
              raise RuntimeError("RenderBuffer is not resizeable")
          # Check shape
          if not (isinstance(shape, tuple) and len(shape) in (2, 3)):
              raise ValueError('RenderBuffer shape must be a 2/3 element tuple')
          # Check format
          if format is None:
              format = self._format  # Use current format (may be None)
          elif isinstance(format, int):
              pass  # Do not check, maybe user needs desktop GL formats
          elif isinstance(format, string_types):
              if format not in ('color', 'depth', 'stencil'):
                  raise ValueError('RenderBuffer format must be "color", "depth"'
                                   ' or "stencil", not %r' % format)
          else:
              raise ValueError('Invalid RenderBuffer format: %r' % format)
          
          # Store and send GLIR command
          self._shape = tuple(shape[:2])
          self._format = format
          if self._format is not None:
              self._glir.command('SIZE', self._id, self._shape, self._format)
docs: Set the render-buffer size and format
  
          Parameters
          ----------
          shape : tuple of integers
              New shape in yx order. A render buffer is always 2D. For
              symmetry with the texture class, a 3-element tuple can also
              be given, in which case the last dimension is ignored.
          format : {None, 'color', 'depth', 'stencil'}
              The buffer format. If None, the current format is maintained. 
              If that is also None, the format will be set upon attaching
              it to a framebuffer. One can also specify the explicit enum:
              GL_RGB565, GL_RGBA4, GL_RGB5_A1, GL_DEPTH_COMPONENT16, or
              GL_STENCIL_INDEX8