void sub_data(std::size_t, std::size_t, const void *);
std::size_t get_size() const { return size; }
+ using BufferBackend::get_multiplicity;
+ std::size_t get_total_size() const { return size*get_multiplicity(); }
BufferUsage get_usage() const { return usage; }
void require_size(std::size_t) const;