code: function deleteFBO(renderState) {
      if (!m_handle) {
        return;
      }
  
      for (var key in m_fboAttachmentMap) {
        if (m_fboAttachmentMap.hasOwnProperty(key)) {
          renderState.m_context.deleteRenderbuffer(key);
        }
      }
      renderState.m_context.deleteFramebuffer(m_handle);
    }
docs: //////////////////////////////////////////////////////////////////////////