snake.h File Reference

Snake game logic module with low level state machine. More...

#include <stdint.h>
#include <stdbool.h>
#include "2dspace.h"

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Data Structures
struct	snake_state
	Structure holding all snake info. More...

Macros
#define	GAME_DIM   8
	Width of the game in snake length units (should be consulted with dispay width).
#define	MAX_SNAKE_SIZE   (GAME_DIM*GAME_DIM)
	Maximum size that can be occupied by snake body parts.

Enumerations
enum	state_t { INIT , GAME_OVER , RUNNING }
	snake game state type More...

Functions
void	snake_update (void)
	snake logic state machine function.
void	snake_direction_request (direction_t requested_direction)
	Requests change of current snake direction in state machine.
void	snake_init_request (int fruit_seed)
	Requests initialization of the snake game in state machine.
void	snake_move_request (void)
	Requests 1-tile move of snake in state machine.
bool	snake_is_over (void)
	Checks if snake game state is GAME_OVER.
const snake_state *	snake_get_state (void)
	Passes current snake game state.

Detailed Description

Snake game logic module with low level state machine.

Author

bslrd

Date

2026

SPDX-License-Identifier: MIT

Macro Definition Documentation

GAME_DIM

#define GAME_DIM   8

Width of the game in snake length units (should be consulted with dispay width).

MAX_SNAKE_SIZE

#define MAX_SNAKE_SIZE   (GAME_DIM*GAME_DIM)

Maximum size that can be occupied by snake body parts.

Enumeration Type Documentation

state_t

enum state_t

snake game state type

Enumerator
INIT
GAME_OVER
RUNNING

Function Documentation

snake_direction_request()

void snake_direction_request

(

direction_t

requested_direction

)

Requests change of current snake direction in state machine.

Parameters

requested_direction

Direction requested by input system.

Note

Called by game.c state machine.

snake_get_state()

const snake_state * snake_get_state

(

void

)

Passes current snake game state.

Note

The pointer represents valid state until next snake_update() function use.

snake_init_request()

void snake_init_request

(

int

fruit_seed

)

Requests initialization of the snake game in state machine.

Parameters

fruit_seed

Seed used for random fruit position generator.

Note

Called by game.c state machine.

snake_is_over()

bool snake_is_over

(

void

)

Checks if snake game state is GAME_OVER.

snake_move_request()

void snake_move_request

(

void

)

Requests 1-tile move of snake in state machine.

Note

Called by game.c state machine.

snake_update()

void snake_update

(

void

)

snake logic state machine function.

Handles three snake game states (INIT, GAME_OVER, RUNNING).

Note

Called by game.c state machine.

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