code: func (md MetalDrawable) Texture() mtl.Texture {
  	return mtl.NewTexture(C.MetalDrawable_Texture(md.metalDrawable))
  }
docs: // Texture returns a Metal texture object representing the drawable object's content.
  //
  // Reference: https://developer.apple.com/documentation/quartzcore/cametaldrawable/1478159-texture.