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104 lines
2.5 KiB
C
104 lines
2.5 KiB
C
/* game_util.h
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*
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*
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* Copyright (C) 2020 Toxic All Rights Reserved.
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*
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* This file is part of Toxic.
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*
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* Toxic is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Toxic is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Toxic. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef GAME_UTIL
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#define GAME_UTIL
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#include <stdbool.h>
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#include <time.h>
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typedef struct Coords {
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int x;
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int y;
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} Coords;
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// don't change these
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typedef enum Direction {
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NORTH = 0u,
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SOUTH = 1,
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EAST = 3,
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WEST = 4,
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INVALID_DIRECTION = 5
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} Direction;
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/*
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* Use these for ms and second timestamps respectively so we don't accidentally interchange them
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*/
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typedef int64_t TIME_MS;
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typedef time_t TIME_S;
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/*
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* Return true if coordinates x1, y1 overlap with x2, y2.
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*/
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#define COORDINATES_OVERLAP(x1, y1, x2, y2)(((x1) == (x2)) && ((y1) == (y2)))
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/*
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* Halves speed if moving north or south. This accounts for the fact that Y steps are twice as large as X steps.
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*/
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#define GAME_UTIL_REAL_SPEED(dir, speed)((((dir) == (NORTH)) || ((dir) == (SOUTH))) ? (MAX(1, ((speed) / 2))) : (speed))
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/*
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* Return true if dir is a valid Direction.
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*/
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#define GAME_UTIL_DIRECTION_VALID(dir)((dir) < (INVALID_DIRECTION))
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/*
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* Returns cardinal direction mapped to `key`.
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*/
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Direction game_util_get_direction(int key);
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/*
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* Returns the direction that will move `coords_a` closest to `coords_b`.
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*
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* If `inverse` is true, returns the opposite result.
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*/
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Direction game_util_move_towards(const Coords *coords_a, const Coords *coords_b, bool inverse);
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/*
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* Returns a random direction.
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*/
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Direction game_util_random_direction(void);
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/*
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* Moves `coords` one square towards `direction`.
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*/
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void game_util_move_coords(Direction direction, Coords *coords);
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/*
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* Returns a random colour.
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*/
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int game_util_random_colour(void);
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/*
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* Packs an unsigned 32 bit integer `v` into `bytes`.
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*/
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size_t game_util_pack_u32(uint8_t *bytes, uint32_t v);
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/*
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* Unpacks an unsigned 32 bit integer in `bytes` to `v`.
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*/
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size_t game_util_unpack_u32(const uint8_t *bytes, uint32_t *v);
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#endif // GAME_UTIL
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