shadow_seq = make_unique<GL::Sequence>(shadow_size, shadow_size);
shadow_seq->set_debug_name("Shadow sequence");
GL::Sequence::Step *step = &shadow_seq->add_step("shadow", content);
shadow_seq = make_unique<GL::Sequence>(shadow_size, shadow_size);
shadow_seq->set_debug_name("Shadow sequence");
GL::Sequence::Step *step = &shadow_seq->add_step("shadow", content);