shift.h

#ifndef SHIFT_H
#define SHIFT_H

#include "storage.h"

class shift {
public:
	abstract_voxel_storage* until = nullptr;
	boost::optional<int> max_depth;

	regular_voxel_storage* operator()(abstract_voxel_storage* storage, int dx, int dy, int dz) {
		regular_voxel_storage* shifted = (regular_voxel_storage*)storage->empty_copy();
		auto bounds = storage->bounds();

		auto extents = shifted->extents().as<long>();
		auto zero = make_vec<long>(0, 0, 0);

		auto dxyz = make_vec<long>(dx, dy, dz);

		bool use_value = storage->value_bits() == 32;

		if (use_value) {
			uint32_t v;
			BEGIN_LOOP_I2(bounds[0], bounds[1])
				storage->Get(ijk, &v);
				if (v) {
					auto ijk2 = ijk.as<long>() + dxyz;
					if ((ijk2 >= zero).all() && (ijk2 < extents).all()) {
						shifted->Set(ijk2.as<size_t>(), &v);
					}
				}
			END_LOOP;

		} else {
			BEGIN_LOOP_I2(bounds[0], bounds[1])
				if (storage->Get(ijk)) {
					auto ijk2 = ijk.as<long>() + dxyz;
					if ((ijk2 >= zero).all() && (ijk2 < extents).all()) {
						shifted->Set(ijk2.as<size_t>());
					}
				}
			END_LOOP;
		}

		return shifted;
	}
};

#endif