voxel-raycaster/include/map/Octree.h

#pragma once
#include <SFML/System/Vector3.hpp>
#include <vector>
#include "util.hpp"

#define OCT_DIM 32

class Octree {
public:
	Octree();
	~Octree() {};

	uint64_t *trunk_buffer      = new uint64_t[10000];
	uint64_t *descriptor_buffer = new uint64_t[100000];
	uint32_t *attachment_lookup = new uint32_t[100000];
	uint64_t *attachment_buffer = new uint64_t[100000];

	uint64_t root_index = 0;
	uint64_t stack_pos = 0x8000;
	uint64_t global_pos = 0;

	uint64_t copy_to_stack(std::vector<uint64_t> children, unsigned int voxel_scale);

	// With a position and the head of the stack. Traverse down the voxel hierarchy to find
	// the IDX and stack position of the highest resolution (maybe set resolution?) oct
	bool get_voxel(sf::Vector3i position);

	void print_block(int block_pos);

private:

	std::vector<uint64_t> anchor_stack;
	unsigned int octree_voxel_dimension = 32;

	// (X, Y, Z) mask for the idx
	const uint8_t idx_set_x_mask = 0x1;
	const uint8_t idx_set_y_mask = 0x2;
	const uint8_t idx_set_z_mask = 0x4;

	// Mask for checking if valid or leaf
	const uint8_t mask_8[8] = {
		0x1,  0x2,  0x4,  0x8,
		0x10, 0x20, 0x40, 0x80
	};

	// Mask for counting the previous valid bits
	const uint8_t count_mask_8[8]{
		0x1,  0x3,  0x7,  0xF,
		0x1F, 0x3F, 0x7F, 0xFF
	};


	// uint64_t manipulation masks
	const uint64_t child_pointer_mask = 0x0000000000007fff;
	const uint64_t far_bit_mask = 0x8000;
	const uint64_t valid_mask = 0xFF0000;
	const uint64_t leaf_mask = 0xFF000000;
	const uint64_t contour_pointer_mask = 0xFFFFFF00000000;
	const uint64_t contour_mask = 0xFF00000000000000;

};