pandemonium_engine/modules/voxelman/meshers/cubic/voxel_cube_points.h

#ifndef SUB_VOXEL_POINTS_H
#define SUB_VOXEL_POINTS_H

/*************************************************************************/
/*  voxel_cube_points.h                                                  */
/*************************************************************************/
/*                         This file is part of:                         */
/*                          PANDEMONIUM ENGINE                           */
/*             https://github.com/Relintai/pandemonium_engine            */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar.                              */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
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/*************************************************************************/

#include "core/containers/vector.h"
#include "core/object/reference.h"

class VoxelChunk;
class SubVoxelFacePointsHelper;

class VoxelCubePoints : public Reference {
	GDCLASS(VoxelCubePoints, Reference);

public:
	enum Points {
		P000 = 0,
		P100 = 1,
		P010 = 2,
		P001 = 3,

		P110 = 4,
		P011 = 5,
		P101 = 6,
		P111 = 7,

		POINT_COUNT = 8,
	};

	enum VoxelFaces {
		VOXEL_FACE_FRONT = 0,
		VOXEL_FACE_RIGHT = 1,
		VOXEL_FACE_BACK = 2,
		VOXEL_FACE_LEFT = 3,
		VOXEL_FACE_TOP = 4,
		VOXEL_FACE_BOTTOM = 5,
		VOXEL_FACE_COUNT = 6,
	};

	enum VoxelNeighbours {
		VOXEL_NEIGHBOUR_NONE = 0,

		VOXEL_NEIGHBOUR_LEFT = 1 << 0,
		VOXEL_NEIGHBOUR_RIGHT = 1 << 1,
		VOXEL_NEIGHBOUR_FRONT = 1 << 2,
		VOXEL_NEIGHBOUR_BACK = 1 << 3,
		VOXEL_NEIGHBOUR_TOP = 1 << 4,
		VOXEL_NEIGHBOUR_BOTTOM = 1 << 5,

		VOXEL_NEIGHBOUR_LEFT_FRONT = 1 << 6,
		VOXEL_NEIGHBOUR_LEFT_BACK = 1 << 7,
		VOXEL_NEIGHBOUR_RIGHT_FRONT = 1 << 8,
		VOXEL_NEIGHBOUR_RIGHT_BACK = 1 << 9,

		VOXEL_NEIGHBOUR_TOP_LEFT = 1 << 10,
		VOXEL_NEIGHBOUR_TOP_RIGHT = 1 << 11,
		VOXEL_NEIGHBOUR_TOP_FRONT = 1 << 12,
		VOXEL_NEIGHBOUR_TOP_BACK = 1 << 13,

		VOXEL_NEIGHBOUR_BOTTOM_LEFT = 1 << 14,
		VOXEL_NEIGHBOUR_BOTTOM_RIGHT = 1 << 15,
		VOXEL_NEIGHBOUR_BOTTOM_FRONT = 1 << 16,
		VOXEL_NEIGHBOUR_BOTTOM_BACK = 1 << 17,

		VOXEL_NEIGHBOUR_BOTTOM_LEFT_FRONT = 1 << 18,
		VOXEL_NEIGHBOUR_BOTTOM_LEFT_BACK = 1 << 19,
		VOXEL_NEIGHBOUR_BOTTOM_RIGHT_FRONT = 1 << 20,
		VOXEL_NEIGHBOUR_BOTTOM_RIGHT_BACK = 1 << 21,

		VOXEL_NEIGHBOUR_TOP_LEFT_FRONT = 1 << 22,
		VOXEL_NEIGHBOUR_TOP_LEFT_BACK = 1 << 23,
		VOXEL_NEIGHBOUR_TOP_RIGHT_FRONT = 1 << 24,
		VOXEL_NEIGHBOUR_TOP_RIGHT_BACK = 1 << 25,

		VOXEL_FULL_NEIGHBOURS_CROSS = VOXEL_NEIGHBOUR_LEFT | VOXEL_NEIGHBOUR_RIGHT | VOXEL_NEIGHBOUR_BACK | VOXEL_NEIGHBOUR_FRONT | VOXEL_NEIGHBOUR_TOP | VOXEL_NEIGHBOUR_BOTTOM, // | VOXEL_NEIGHBOUR_LEFT_BACK | VOXEL_NEIGHBOUR_LEFT_FRONT | VOXEL_NEIGHBOUR_RIGHT_BACK | VOXEL_NEIGHBOUR_RIGHT_FRONT;
		VOXEL_FULL_SIDE_NEIGHBOURS = VOXEL_NEIGHBOUR_LEFT | VOXEL_NEIGHBOUR_RIGHT | VOXEL_NEIGHBOUR_BACK | VOXEL_NEIGHBOUR_FRONT,
		VOXEL_FULL_SIDE_NEIGHBOURS_TOP = VOXEL_NEIGHBOUR_LEFT | VOXEL_NEIGHBOUR_RIGHT | VOXEL_NEIGHBOUR_BACK | VOXEL_NEIGHBOUR_FRONT | VOXEL_NEIGHBOUR_TOP,
		VOXEL_FULL_SIDE_NEIGHBOURS_DOWN = VOXEL_NEIGHBOUR_LEFT | VOXEL_NEIGHBOUR_RIGHT | VOXEL_NEIGHBOUR_BACK | VOXEL_NEIGHBOUR_FRONT | VOXEL_NEIGHBOUR_BOTTOM,
	};

	int get_x();
	void set_x(int value);

	int get_y();
	void set_y(int value);

	int get_z();
	void set_z(int value);

	int get_size();
	void set_size(int value);

	int get_channel_index_type() const;
	void set_channel_index_type(const int value);

	int get_channel_index_isolevel() const;
	void set_channel_index_isolevel(const int value);

	void refresh_points();
	void recalculate_point(int point);
	void refresh_neighbours(Ref<VoxelChunk> chunk);
	void setup(Ref<VoxelChunk> chunk, int x, int y, int z, int size = 1);

	void reset();

	int get_point_index(int face, int index);
	Vector2 get_point_uv_direction(int face, int index);

	Vector3 get_points_for_face(int face, int index);
	bool is_face_visible(int face);
	bool is_sub_voxel_point(int x, int y, int z);
	void set_point(int point, int x, int y, int z);
	int get_point_id(int x, int y, int z);

	Vector3 get_point_for_face(int face, int pointIndex);
	Vector3 get_vertex_vector3_for_point(int face, int pointIndex);

	int get_point_type(int index);
	int get_point_fill(int index);
	int get_point_neighbours(int index);

	int get_point_ao(int index);
	int get_face_point_ao(int face, int index);
	Color get_face_point_ao_color(int face, int index);
	Color get_face_point_light_color(int face, int index);
	Color get_face_point_color_mixed(int face, int index);

	Vector3 get_face_light_direction(int face);

	Vector3 get_point(int index);
	Vector3 get_top_left_point(int face);
	Vector3 get_top_right_point(int face);
	Vector3 get_bottom_left_point(int face);
	Vector3 get_bottom_right_point(int face);

	uint8_t get_face_type(int face);

	bool has_points();
	int get_opposite_face(int face);

	VoxelCubePoints();
	~VoxelCubePoints();

protected:
	static void _bind_methods();

	static const unsigned int index_table[6][4];
	static const unsigned int visibility_check_table[6];
	static const int face_light_direction_table[6][3];
	static const float point_direction_table[8][3];
	static const unsigned int point_direction_neighbour_table[8][3];
	static const float uv_direction_table[8][4][2];

private:
	int _channel_index_type;
	int _channel_index_isolevel;

	Vector3 _points[POINT_COUNT];

	uint8_t _point_types[POINT_COUNT];
	uint8_t _point_fills[POINT_COUNT];
	uint8_t _point_aos[POINT_COUNT];
	Color _point_colors[POINT_COUNT];
	unsigned int _point_neighbours[POINT_COUNT];

	int _size;
	int _x;
	int _y;
	int _z;
};

VARIANT_ENUM_CAST(VoxelCubePoints::Points);
VARIANT_ENUM_CAST(VoxelCubePoints::VoxelFaces);
VARIANT_ENUM_CAST(VoxelCubePoints::VoxelNeighbours);

#endif