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/*
* Copyright 2016-2018 Uber Technologies, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/** @file baseCells.h
* @brief Base cell related lookup tables and access functions.
*/
#ifndef BASECELLS_H
#define BASECELLS_H
#include "constants.h"
#include "coordijk.h"
#include "faceijk.h"
/** @struct BaseCellData
* @brief information on a single base cell
*/
typedef struct {
FaceIJK
homeFijk; ///< "home" face and normalized ijk coordinates on that face
int isPentagon; ///< is this base cell a pentagon?
int cwOffsetPent[2]; ///< if a pentagon, what are its two clockwise offset
/// faces?
} BaseCellData;
#define INVALID_BASE_CELL 127
extern const int baseCellNeighbors[NUM_BASE_CELLS][7];
extern const int baseCellNeighbor60CCWRots[NUM_BASE_CELLS][7];
// resolution 0 base cell data lookup-table (global)
extern const BaseCellData baseCellData[NUM_BASE_CELLS];
/** Maximum input for any component to face-to-base-cell lookup functions */
#define MAX_FACE_COORD 2
/** Invalid number of rotations */
#define INVALID_ROTATIONS -1
// Internal functions
int _isBaseCellPentagon(int baseCell);
bool _isBaseCellPolarPentagon(int baseCell);
int _faceIjkToBaseCell(const FaceIJK* h);
int _faceIjkToBaseCellCCWrot60(const FaceIJK* h);
int _baseCellToCCWrot60(int baseCell, int face);
void _baseCellToFaceIjk(int baseCell, FaceIJK* h);
bool _baseCellIsCwOffset(int baseCell, int testFace);
int _getBaseCellNeighbor(int baseCell, Direction dir);
Direction _getBaseCellDirection(int originBaseCell, int destinationBaseCell);
#endif
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