+ const Bufferable *last = this;
+ for(; last->next_in_buffer; last=last->next_in_buffer) ;
+
+ unsigned total_size = last->offset+last->get_data_size();
+
+ if(total_size>buffer->get_size())
+ {
+ buffer->data(total_size, 0);
+ /* Resizing the buffer invalidates its contents. Non-dirty data may
+ be in use, so reupload it. */
+ for(const Bufferable *b=last; b; b=b->prev_in_buffer)
+ if(!b->dirty)
+ b->upload_data();
+ }