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CHANGE.md Normal file
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0.6.2_3 (2020-10-10)
====================
* Update contrib/IBM-Plex-Sans to 5.1.3
0.6.2_2 (2019-10-31)
====================
* Make sound support optional
0.6.2_1 (2019-10-30)
====================
* Make GPIO support optional
0.6.2 (2019-03-27)
==================
* Fix GPIO interrupt
0.6.1 (2019-03-25)
==================
* Fix GPIO mapping
0.6.0 (2019-03-18)
==================
* Change timer resolution to nanosecond
* Add colour selection to renderer
* Add GPIO support
0.5.1 (2019-03-12)
==================
* Add a pause at the start of flappy mode
0.5.0 (2019-03-09)
==================
* Change keyboard key map
* Change maximum speed in classic mode to a lower value
* Change snake initial position to be centred
* Add flappy bird like game mode
0.4.1 (2019-03-06)
==================
* Fix swipe threshold
0.4.0 (2019-03-04)
==================
* Change game loop to be threaded
* Change menu to be event driven
* Change font size
* Add font texture caching
* Add option to toggle music
* Add condition for clearing game
* Add touchscreen support
0.3.1 (2019-02-22)
==================
* Fix pause logic
0.3.0 (2019-02-22)
==================
* Change memory allocation method
* Change difficult scaling
* Add pause function
0.2.0 (2019-02-21)
==================
* Add multiplayer mode
* Add key press driven menu
0.1.0 (2019-02-20)
==================
* Initial release

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Snake
=====
Dependency
----------
1. sdl2 with OpenGL support
2. sdl2\_ttf
3. sdl2\_mixer with FLAC support (optional)
Build
-----
Download contrib resources and extract
to contrib/
`cd src`
`make`
With GPIO support:
`make -DGPIO`
With SOUND support:
`make -DSOUND`
Run
---
`./snake`
Installation
------------
`make install`
To-do
-----
* Leaderboard (SQLite)

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# Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
#
# SPDX-License-Identifier: Apache-2.0
src = main.c collision.c game.c input.c renderer.c
inc = extern.h game.h input.h renderer.h screen.h version.h
.ifdef GPIO
src += gpio.c
inc += gpio.h
.endif
obj = ${src:.c=.o}
PREFIX = /usr/local
CFLAGS = -O3 -march=native -pipe -flto=thin -Wall -Wno-unused-result
LDFLAGS = -Wl,-O3 -lpthread -lSDL2 -lSDL2_ttf
.ifdef SOUND
LDFLAGS += -lSDL2_mixer
.endif
LDFLAGS += -Wl,--as-needed
CFLAGS += -I/usr/local/include
LDFLAGS += -L/usr/local/lib
all: ${obj} ${inc}
${CC} ${LDFLAGS} -o snake ${obj}
clean:
rm -f snake ${obj}
install:
install -d ${PREFIX}/bin
install -d ${PREFIX}/share/snake
install snake ${PREFIX}/bin
install -m644 ../contrib/font.ttf ${PREFIX}/share/snake
install -m644 ../contrib/music.flac ${PREFIX}/share/snake
deinstall:
rm -f ${PREFIX}/bin/snake
rm -rf ${PREFIX}/share/snake
.PHONY: all clean install deinstall

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdbool.h>
#include <SDL2/SDL.h>
#include "screen.h"
#include "renderer.h"
bool
collision(int *a, int *b)
{
if (a[0] < b[0] + b[2] &&
a[0] + a[2] > b[0] &&
a[1] < b[1] + b[3] &&
a[1] + a[3] > b[1])
return 1;
return 0;
}
bool
collision_block(int *a, int *b)
{
return collision(
(int[]) {a[0], a[1], SCREEN_UNIT, SCREEN_UNIT},
(int[]) {b[0], b[1], SCREEN_UNIT, SCREEN_UNIT});
}
bool
collision_bound(float x, float y, Snake_Text *message)
{
if (x > message->pos.x &&
x < message->pos.x + message->pos.w &&
y > message->pos.y &&
y < message->pos.y + message->pos.h)
return 1;
return 0;
}

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
#include "renderer.h"
#include "game.h"
#include "input.h"
bool collision(int *a, int *b);
bool collision_block(int *a, int *b);
bool collision_bound(float x, float y, Snake_Text *message);
void draw_clear(SDL_Renderer *renderer);
void draw_colour(SDL_Renderer *renderer, Snake_Colour colour);
void draw_text(SDL_Renderer *renderer, TTF_Font *font,
int text_x, int text_y, char *text,
bool centre, bool select, SDL_Color fg, SDL_Color bg,
Snake_Text *message);
void draw_wall(SDL_Renderer *renderer);
void draw_snake(SDL_Renderer *renderer, Snake_Pos **snake);
void draw_fruit(SDL_Renderer *renderer, int *fruit);
void draw_pipe(SDL_Renderer *renderer, Snake_Pos **pipe);
void game_snake_init(Snake_Pos **snake, int dx);
void game_snake_move(Snake_Pos **snake0, Snake_Pos **snake1,
Snake_Input *head, bool lawi, int *legal);
void game_snake_grow(Snake_Pos **snake);
void game_fruit(int *fruit, Snake_Pos **snake);
void game_snake_fall(Snake_Pos **snake, bool norm, int speed);
void game_pipe_init(Snake_Pos **pipe);
void game_pipe_move(Snake_Pos **pipe);
void game_pipe_add(Snake_Pos **pipe);
void game_pipe_del(Snake_Pos **pipe);
void game_pipe_pos(Snake_Pos **pipe, int *state);
void game_pipe_bound(Snake_Pos **pipe, int *pos);
void input_keyboard(SDL_Keycode sym, Snake_Input *code);
void input_controller(uint8_t button, Snake_Input *code);
void input_gpio(int gpio, uint8_t *button);
#ifdef GPIO
int gpio_export(int pin);
int gpio_unexport(int pin);
int gpio_config(int pin, int direction, int interrupt);
int gpio_write(int pin, int value);
int gpio_read(int pin);
#endif /* GPIO */

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdbool.h>
#include "extern.h"
#include "screen.h"
static bool
_collision(int *fruit, Snake_Pos **snake)
{
Snake_Pos *ptr = *snake;
while (ptr != NULL) {
if (collision_block(fruit, (int[]) {ptr->x, ptr->y}))
return 1;
ptr = ptr->next;
}
return 0;
}
static bool
_bound(Snake_Pos **snake)
{
if ((*snake)->x + SCREEN_UNIT / 2 > SCREEN_HEIGHT)
return 1;
else if ((*snake)->y + SCREEN_UNIT / 2 > SCREEN_HEIGHT)
return 1;
else if ((*snake)->x - SCREEN_UNIT / 2 < -SCREEN_UNIT)
return 1;
else if ((*snake)->y - SCREEN_UNIT / 2 < -SCREEN_UNIT)
return 1;
return 0;
}
static int
_overlap(Snake_Pos **snake0, Snake_Pos **snake1)
{
Snake_Pos *ptr0 = *snake0;
Snake_Pos *ptr1;
int is_overlap[2] = {0, 0};
while (ptr0->next->next != NULL) {
if (collision_block(
(int[]) {(*snake0)->x, (*snake0)->y},
(int[]) {ptr0->next->x, ptr0->next->y})) {
is_overlap[0] = 1;
break;
}
ptr0 = ptr0->next;
}
if (snake1 != NULL) {
ptr0 = *snake0;
ptr1 = *snake1;
while (ptr0->next->next != NULL &&
ptr1->next->next != NULL &&
(is_overlap[0] != 1 || is_overlap[1] != 2)) {
if (collision_block(
(int[]) {(*snake0)->x, (*snake0)->y},
(int[]) {ptr1->next->x, ptr1->next->y}))
is_overlap[0] = 1;
if (collision_block(
(int[]) {(*snake1)->x, (*snake1)->y},
(int[]) {ptr0->next->x, ptr0->next->y}))
is_overlap[1] = 2;
if (collision_block(
(int[]) {(*snake1)->x, (*snake1)->y},
(int[]) {ptr1->next->x, ptr1->next->y}))
is_overlap[1] = 2;
ptr0 = ptr0->next;
ptr1 = ptr1->next;
}
}
return is_overlap[0] + is_overlap[1];
}
void
game_snake_init(Snake_Pos **snake, int dx)
{
Snake_Pos *ptr;
while ((ptr = *snake) != NULL) {
*snake = (*snake)->next;
free(ptr);
}
*snake = malloc(sizeof(Snake_Pos));
(*snake)->next = malloc(sizeof(Snake_Pos));
(*snake)->x = (*snake)->next->x = SCREEN_HEIGHT / 2 + dx;
(*snake)->y = SCREEN_HEIGHT / 2;
(*snake)->next->y = SCREEN_HEIGHT / 2 + SCREEN_UNIT;
(*snake)->next->next = NULL;
}
void
game_snake_move(Snake_Pos **snake0, Snake_Pos **snake1,
Snake_Input *head, bool law, int *legal)
{
bool bound_snake0;
bool bound_snake1;
int overlap;
Snake_Pos *ptr0;
Snake_Pos *ptr1;
ptr0 = malloc(sizeof(Snake_Pos));
ptr0->x = (*snake0)->x;
ptr0->y = (*snake0)->y;
ptr0->next = *snake0;
switch (head[0]) {
case SNAKE_LEFT:
ptr0->x -= SCREEN_UNIT;
break;
case SNAKE_UP:
ptr0->y -= SCREEN_UNIT;
break;
case SNAKE_DOWN:
ptr0->y += SCREEN_UNIT;
break;
case SNAKE_RIGHT:
ptr0->x += SCREEN_UNIT;
break;
default:
break;
}
bound_snake0 = _bound(&ptr0);
if (snake1 == NULL) {
overlap = _overlap(&ptr0, NULL);
if (bound_snake0 || overlap == 1)
*legal = 1;
else
*legal = 0;
} else {
ptr1 = malloc(sizeof(Snake_Pos));
ptr1->x = (*snake1)->x;
ptr1->y = (*snake1)->y;
ptr1->next = *snake1;
switch (head[1]) {
case SNAKE_LEFT:
ptr1->x -= SCREEN_UNIT;
break;
case SNAKE_UP:
ptr1->y -= SCREEN_UNIT;
break;
case SNAKE_DOWN:
ptr1->y += SCREEN_UNIT;
break;
case SNAKE_RIGHT:
ptr1->x += SCREEN_UNIT;
break;
default:
break;
}
bound_snake1 = _bound(&ptr1);
overlap = _overlap(&ptr0, &ptr1);
if ((bound_snake0 && bound_snake1) || overlap == 3)
*legal = 3;
else if (bound_snake1 || overlap == 2)
*legal = 2;
else if (bound_snake0 || overlap == 1)
*legal = 1;
else
*legal = 0;
}
if (*legal == 0 || !law) {
*snake0 = ptr0;
while (ptr0->next->next != NULL)
ptr0 = ptr0->next;
free(ptr0->next);
ptr0->next = NULL;
if (snake1 != NULL) {
*snake1 = ptr1;
while (ptr1->next->next != NULL)
ptr1 = ptr1->next;
free(ptr1->next);
ptr1->next = NULL;
}
} else {
free(ptr0);
if (snake1 != NULL)
free(ptr1);
}
}
void
game_snake_grow(Snake_Pos **snake)
{
Snake_Pos *ptr = *snake;
while (ptr->next != NULL)
ptr = ptr->next;
ptr->next = malloc(sizeof(Snake_Pos));
ptr->next->x = ptr->x;
ptr->next->y = ptr->y;
ptr->next->next = NULL;
}
void
game_fruit(int *fruit, Snake_Pos **snake)
{
do {
fruit[0] = rand() % SCREEN_SIDE * SCREEN_UNIT;
fruit[1] = rand() % SCREEN_SIDE * SCREEN_UNIT;
} while (_collision(fruit, snake));
}
void
game_snake_fall(Snake_Pos **snake, bool norm, int speed)
{
Snake_Pos *ptr = *snake;
while(ptr != NULL) {
ptr->y += norm ? speed : -speed;
ptr = ptr->next;
}
}
void
game_pipe_init(Snake_Pos **pipe)
{
Snake_Pos *ptr;
while ((ptr = *pipe) != NULL) {
*pipe = (*pipe)->next;
free(ptr);
}
*pipe = malloc(sizeof(Snake_Pos));
(*pipe)->x = SCREEN_HEIGHT;
(*pipe)->y = (rand() % (SCREEN_SIDE - PIPE_GAP) + PIPE_GAP) *
SCREEN_UNIT;
(*pipe)->next = NULL;
}
void
game_pipe_move(Snake_Pos **pipe)
{
Snake_Pos *ptr = *pipe;
while(ptr != NULL) {
ptr->x -= 1;
ptr = ptr->next;
}
}
void
game_pipe_add(Snake_Pos **pipe)
{
Snake_Pos *ptr = *pipe;
while(ptr->next != NULL)
ptr = ptr->next;
ptr->next = malloc(sizeof(Snake_Pos));
ptr->next->x = SCREEN_HEIGHT;
ptr->next->y = (rand() % (SCREEN_SIDE - PIPE_GAP) + PIPE_GAP) *
SCREEN_UNIT;
ptr->next->next = NULL;
}
void
game_pipe_del(Snake_Pos **pipe)
{
Snake_Pos *ptr = *pipe;
*pipe = (*pipe)->next;
free(ptr);
}
void
game_pipe_pos(Snake_Pos **pipe, int *state)
{
Snake_Pos *ptr = *pipe;
*state = 0;
*state += ptr->x + SCREEN_UNIT < 0 ? 1 : 0;
while(ptr->next != NULL)
ptr = ptr->next;
*state += ptr->x < SCREEN_HEIGHT - PIPE_DISTANCE * SCREEN_UNIT ? 2 : 0;
}
/*
* This function returns the dimension of pipes
* that snake is currently passing through,
* so that we can avoid checking all pipes for
* collision
*
* Array elements: x, w, y0, h0, y1, h1
*/
void
game_pipe_bound(Snake_Pos **pipe, int *pos)
{
Snake_Pos *ptr = *pipe;
while(ptr != NULL) {
if (ptr->x < SCREEN_HEIGHT / 2 &&
ptr->x + SCREEN_UNIT > SCREEN_HEIGHT / 2) {
pos[0] = ptr->x;
pos[1] = SCREEN_UNIT;
pos[2] = 0;
pos[3] = ptr->y - PIPE_GAP / 2 * SCREEN_UNIT;
pos[4] = ptr->y + PIPE_GAP / 2 * SCREEN_UNIT;
pos[5] = SCREEN_HEIGHT - ptr->y - SCREEN_UNIT;
return;
}
ptr = ptr->next;
}
pos[0] = 0;
}

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define TICK_TIME_INIT 250000000
#define TICK_TIME_DEC 10000000
#define TICK_TIME_MIN 100000000
#define PIPE_GAP 4
#define PIPE_DISTANCE 10
typedef struct _Snake_Pos {
int x;
int y;
struct _Snake_Pos *next;
} Snake_Pos;

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include "gpio.h"
#ifdef __FreeBSD__
int
gpio_config(int pin, int direction, int interrupt)
{
int ret;
int fd = open("/dev/gpioc0", O_RDWR);
if (fd == -1) {
fprintf(stderr, "GPIO configuration failure\n");
return 1;
}
struct gpio_pin pin_req = {
.gp_pin = pin,
.gp_caps = interrupt,
.gp_flags = direction
};
ret = ioctl(fd, GPIOSETCONFIG, &pin_req) == 0 ? 0 : 1;
close(fd);
return ret;
}
int
gpio_write(int pin, int value)
{
int ret;
int fd = open("/dev/gpioc0", O_RDWR);
if (fd == -1) {
fprintf(stderr, "GPIO output failure\n");
return 1;
}
struct gpio_req req = {
.gp_pin = pin,
.gp_value = value
};
ret = ioctl(fd, GPIOSET, &req) == 0 ? 0 : 1;
close(fd);
return ret;
}
int
gpio_read(int pin)
{
int fd = open("/dev/gpioc0", O_RDWR);
if (fd == -1) {
fprintf(stderr, "GPIO input failure\n");
return 1;
}
struct gpio_req req = {
.gp_pin = pin
};
ioctl(fd, GPIOGET, &req);
close(fd);
return req.gp_value;
}
#elif __linux__
int
gpio_export(int pin)
{
int export = open("/sys/class/gpio/export", O_RDWR);
if (export == -1) {
fprintf(stderr, "GPIO export failure\n");
return 1;
}
char buf[3];
int buf_size = snprintf(buf, 3, "%d", pin);
write(export, buf, buf_size);
close(export);
return 0;
}
int
gpio_unexport(int pin)
{
int unexport = open("/sys/class/gpio/unexport", O_RDWR);
if (unexport == -1) {
fprintf(stderr, "GPIO unexport failure\n");
return 1;
}
char buf[3];
int buf_size = snprintf(buf, 3, "%d", pin);
write(unexport, buf, buf_size);
close(unexport);
return 0;
}
int
gpio_config(int pin, int direction, int interrupt)
{
char path[33];
snprintf(path, 33, "/sys/class/gpio/gpio%d/direction", pin);
int config = open(path, O_RDWR);
if (config == -1) {
fprintf(stderr, "GPIO configuration failure\n");
return 1;
}
char buf[8];
int buf_size = snprintf(buf, 8, "%s", direction == 0 ? "in" : "out");
write(config, buf, buf_size);
close(config);
snprintf(path, 33, "/sys/class/gpio/gpio%d/edge", pin);
config = open(path, O_RDWR);
if (config == -1) {
fprintf(stderr, "GPIO configuration failure\n");
return 1;
}
buf_size = snprintf(buf, 8, "%s",
interrupt == 0 ? "falling" : "rising");
write(config, buf, buf_size);
close(config);
return 0;
}
int
gpio_write(int pin, int value)
{
char path[29];
snprintf(path, 29, "/sys/class/gpio/gpio%d/value", pin);
int config = open(path, O_RDWR);
if (config == -1) {
fprintf(stderr, "GPIO output failure\n");
return 1;
}
char buf[2];
int buf_size = snprintf(buf, 2, "%d", value);
write(config, buf, buf_size);
close(config);
return 0;
}
int
gpio_read(int pin)
{
char path[29];
snprintf(path, 29, "/sys/class/gpio/gpio%d/value", pin);
int config = open(path, O_RDONLY);
if (config == -1) {
fprintf(stderr, "GPIO input failure\n");
return 1;
}
char buf[2];
read(config, buf, 2);
close(config);
return atoi(buf);
}
#endif /* __FreeBSD__ */

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define GPIO_LOW 0x00
#define GPIO_HIGH 0x01
#ifdef __FreeBSD__
#include <stdint.h>
#include <sys/gpio.h>
#define GPIO_IN GPIO_PIN_INPUT
#define GPIO_OUT GPIO_PIN_OUTPUT
#define GPIO_INT GPIO_INTR_EDGE_FALLING
#elif __linux__
#define GPIO_IN 0x00
#define GPIO_OUT 0x01
/*
* 0: falling
* 1: rising
*/
#define GPIO_INT 0
#endif /* __FreeBSD__ */
/* Raspberry Pi 3 */
#define GPIO_PIN_IN0 4 /* 7: DPAD_LEFT */
#define GPIO_PIN_IN1 14 /* 8: DPAD_UP */
#define GPIO_PIN_IN2 15 /* 10: DPAD_DOWN */
#define GPIO_PIN_IN3 17 /* 11: DPAD_RIGHT */
#define GPIO_PIN_IN4 18 /* 12: BACK */
#define GPIO_PIN_IN5 27 /* 13: GUIDE */
#define GPIO_PIN_IN6 22 /* 15: START */
#define GPIO_PIN_IN7 23 /* 16: A */
#define GPIO_PIN_IN8 24 /* 18: B */
#define GPIO_PIN_IN9 10 /* 19: X */
#define GPIO_PIN_IN10 9 /* 21: Y */
#define GPIO_PIN_IN11 25 /* 22: LEFTSHOULDER */
#define GPIO_PIN_IN12 11 /* 23: RIGHTSHOULDER */
#define GPIO_PIN_IN13 8 /* 24: LEFTSTICK */
#define GPIO_PIN_IN14 7 /* 26: RIGHTSTICK */
/* Second controller */
#define GPIO_PIN_IN15 0 /* 27: DPAD_LEFT */
#define GPIO_PIN_IN16 1 /* 28: DPAD_UP */
#define GPIO_PIN_IN17 5 /* 29: DPAD_DOWN */
#define GPIO_PIN_IN18 6 /* 31: DPAD_RIGHT */
/* Unused */
#define GPIO_PIN_IN19 12 /* 32: NULL */
#define GPIO_PIN_IN20 13 /* 33: NULL */
#define GPIO_PIN_IN21 19 /* 35: NULL */
#define GPIO_PIN_IN22 16 /* 36: NULL */
#define GPIO_PIN_IN23 26 /* 37: NULL */
#define GPIO_PIN_IN24 20 /* 38: NULL */
#define GPIO_PIN_IN25 21 /* 40: NULL */

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <SDL2/SDL.h>
#include "input.h"
void
input_keyboard(SDL_Keycode sym, Snake_Input *code)
{
switch (sym) {
case SDLK_LEFT:
*code = SNAKE_LEFT;
break;
case SDLK_UP:
*code = SNAKE_UP;
break;
case SDLK_DOWN:
*code = SNAKE_DOWN;
break;
case SDLK_RIGHT:
*code = SNAKE_RIGHT;
break;
case SDLK_SPACE:
*code = SNAKE_JUMP;
break;
case SDLK_RETURN:
*code = SNAKE_SELECT;
break;
case SDLK_ESCAPE:
*code = SNAKE_PAUSE;
break;
case SDLK_r:
*code = SNAKE_RESET;
break;
case SDLK_g:
*code = SNAKE_GOD;
break;
case SDLK_h:
*code = SNAKE_GROW;
break;
case SDLK_t:
*code = SNAKE_TELEPORT;
break;
case SDLK_m:
*code = SNAKE_MUSIC;
break;
case SDLK_COMMA:
*code = SNAKE_TICK_DECREASE;
break;
case SDLK_PERIOD:
*code = SNAKE_TICK_INCREASE;
break;
case SDLK_s:
*code = SNAKE_LEFT;
break;
case SDLK_e:
*code = SNAKE_UP;
break;
case SDLK_d:
*code = SNAKE_DOWN;
break;
case SDLK_f:
*code = SNAKE_RIGHT;
break;
default:
*code = SNAKE_EMPTY;
break;
}
}
void
input_controller(uint8_t button, Snake_Input *code)
{
switch (button) {
case SDL_CONTROLLER_BUTTON_DPAD_LEFT:
*code = SNAKE_LEFT;
break;
case SDL_CONTROLLER_BUTTON_DPAD_UP:
*code = SNAKE_UP;
break;
case SDL_CONTROLLER_BUTTON_DPAD_DOWN:
*code = SNAKE_DOWN;
break;
case SDL_CONTROLLER_BUTTON_DPAD_RIGHT:
*code = SNAKE_RIGHT;
break;
case SDL_CONTROLLER_BUTTON_START:
*code = SNAKE_SELECT;
break;
case SDL_CONTROLLER_BUTTON_BACK:
*code = SNAKE_PAUSE;
break;
case SDL_CONTROLLER_BUTTON_GUIDE:
*code = SNAKE_GOD;
break;
case SDL_CONTROLLER_BUTTON_A:
*code = SNAKE_JUMP;
break;
case SDL_CONTROLLER_BUTTON_B:
break;
case SDL_CONTROLLER_BUTTON_X:
*code = SNAKE_RESET;
break;
case SDL_CONTROLLER_BUTTON_Y:
*code = SNAKE_MUSIC;
break;
case SDL_CONTROLLER_BUTTON_LEFTSTICK:
*code = SNAKE_TELEPORT;
break;
case SDL_CONTROLLER_BUTTON_RIGHTSTICK:
*code = SNAKE_GROW;
break;
case SDL_CONTROLLER_BUTTON_LEFTSHOULDER:
*code = SNAKE_TICK_DECREASE;
break;
case SDL_CONTROLLER_BUTTON_RIGHTSHOULDER:
*code = SNAKE_TICK_INCREASE;
break;
default:
*code = SNAKE_EMPTY;
break;
}
}
#ifdef GPIO
void
input_gpio(int gpio, uint8_t *button)
{
switch (gpio) {
case 0:
*button = SDL_CONTROLLER_BUTTON_DPAD_LEFT;
break;
case 1:
*button = SDL_CONTROLLER_BUTTON_DPAD_UP;
break;
case 2:
*button = SDL_CONTROLLER_BUTTON_DPAD_DOWN;
break;
case 3:
*button = SDL_CONTROLLER_BUTTON_DPAD_RIGHT;
break;
case 4:
*button = SDL_CONTROLLER_BUTTON_BACK;
break;
case 5:
*button = SDL_CONTROLLER_BUTTON_GUIDE;
break;
case 6:
*button = SDL_CONTROLLER_BUTTON_START;
break;
case 7:
*button = SDL_CONTROLLER_BUTTON_A;
break;
case 8:
*button = SDL_CONTROLLER_BUTTON_B;
break;
case 9:
*button = SDL_CONTROLLER_BUTTON_X;
break;
case 10:
*button = SDL_CONTROLLER_BUTTON_Y;
break;
case 11:
*button = SDL_CONTROLLER_BUTTON_LEFTSHOULDER;
break;
case 12:
*button = SDL_CONTROLLER_BUTTON_RIGHTSHOULDER;
break;
case 13:
*button = SDL_CONTROLLER_BUTTON_LEFTSTICK;
break;
case 14:
*button = SDL_CONTROLLER_BUTTON_RIGHTSTICK;
break;
default:
*button = SDL_CONTROLLER_BUTTON_INVALID;
break;
}
}
#endif /* GPIO */

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
typedef enum {
SNAKE_EMPTY,
SNAKE_LEFT,
SNAKE_UP,
SNAKE_DOWN,
SNAKE_RIGHT,
SNAKE_JUMP,
SNAKE_SELECT,
SNAKE_PAUSE,
SNAKE_RESET,
SNAKE_GOD,
SNAKE_GROW,
SNAKE_TELEPORT,
SNAKE_MUSIC,
SNAKE_TICK_DECREASE,
SNAKE_TICK_INCREASE
} Snake_Input;
typedef enum {
SNAKE_KEYBOARD,
SNAKE_TOUCHSCREEN,
SNAKE_CONTROLLER
} Snake_Device;

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <stdbool.h>
#include <SDL2/SDL.h>
#include <SDL2/SDL_ttf.h>
#include "renderer.h"
#include "screen.h"
#include "game.h"
void
draw_clear(SDL_Renderer *renderer)
{
SDL_SetRenderDrawColor(renderer,
COLOUR_BACKGROUND_R,
COLOUR_BACKGROUND_G,
COLOUR_BACKGROUND_B,
255);
SDL_RenderClear(renderer);
}
void
draw_colour(SDL_Renderer *renderer, Snake_Colour colour)
{
int r;
int g;
int b;
switch (colour) {
case SNAKE_FOREGROUND:
r = COLOUR_FOREGROUND_R;
g = COLOUR_FOREGROUND_G;
b = COLOUR_FOREGROUND_B;
break;
case SNAKE_BACKGROUND:
r = COLOUR_BACKGROUND_R;
g = COLOUR_BACKGROUND_G;
b = COLOUR_BACKGROUND_B;
break;
case SNAKE_BACKGROUND_SHADE:
r = COLOUR_BACKGROUND_SHADE_R;
g = COLOUR_BACKGROUND_SHADE_G;
b = COLOUR_BACKGROUND_SHADE_B;
break;
case SNAKE_RED:
r = COLOUR_RED_R;
g = COLOUR_RED_G;
b = COLOUR_RED_B;
break;
case SNAKE_GREEN:
r = COLOUR_GREEN_R;
g = COLOUR_GREEN_G;
b = COLOUR_GREEN_B;
break;
case SNAKE_BLUE:
r = COLOUR_RED_R;
g = COLOUR_RED_G;
b = COLOUR_RED_B;
break;
case SNAKE_YELLOW:
r = COLOUR_RED_R;
g = COLOUR_RED_G;
b = COLOUR_RED_B;
break;
case SNAKE_MAGENTA:
r = COLOUR_RED_R;
g = COLOUR_RED_G;
b = COLOUR_RED_B;
break;
case SNAKE_CYAN:
r = COLOUR_RED_R;
g = COLOUR_RED_G;
b = COLOUR_RED_B;
break;
case SNAKE_WHITE:
r = COLOUR_RED_R;
g = COLOUR_RED_G;
b = COLOUR_RED_B;
break;
case SNAKE_BLACK:
r = COLOUR_RED_R;
g = COLOUR_RED_G;
b = COLOUR_RED_B;
break;
default:
break;
}
SDL_SetRenderDrawColor(renderer,
r,
g,
b,
255);
}
void
draw_text(SDL_Renderer *renderer, TTF_Font *font,
int text_x, int text_y, char *text,
bool centre, bool select, SDL_Color fg, SDL_Color bg,
Snake_Text *message)
{
if (!message->cache) {
if (message->texture != NULL)
SDL_DestroyTexture(message->texture);
SDL_Surface *surface =
TTF_RenderUTF8_Shaded(font, text, fg, bg);
message->texture =
SDL_CreateTextureFromSurface(renderer, surface);
SDL_FreeSurface(surface);
message->pos.x = text_x;
message->pos.y = text_y;
TTF_SizeText(font, text, &message->pos.w, &message->pos.h);
if (centre)
message->pos.x -= message->pos.w / 2;
message->pos.y -= message->pos.h;
message->cache = 1;
}
SDL_RenderCopy(renderer, message->texture, NULL, &message->pos);
if (select) {
SDL_SetRenderDrawColor(renderer,
COLOUR_FOREGROUND_R,
COLOUR_FOREGROUND_G,
COLOUR_FOREGROUND_B,
255);
SDL_RenderDrawLine(renderer,
message->pos.x, message->pos.y,
message->pos.x, message->pos.y + message->pos.h);
SDL_RenderDrawLine(renderer,
message->pos.x, message->pos.y,
message->pos.x + message->pos.w, message->pos.y);
SDL_RenderDrawLine(renderer,
message->pos.x, message->pos.y + message->pos.h,
message->pos.x + message->pos.w,
message->pos.y + message->pos.h);
SDL_RenderDrawLine(renderer,
message->pos.x + message->pos.w, message->pos.y,
message->pos.x + message->pos.w,
message->pos.y + message->pos.h);
}
}
void
draw_wall(SDL_Renderer *renderer)
{
SDL_RenderDrawLine(renderer,
0, 0,
0, SCREEN_HEIGHT);
SDL_RenderDrawLine(renderer,
0, 0,
SCREEN_HEIGHT, 0);
SDL_RenderDrawLine(renderer,
0, SCREEN_HEIGHT - 1,
SCREEN_HEIGHT, SCREEN_HEIGHT - 1);
SDL_RenderDrawLine(renderer,
SCREEN_HEIGHT, 0,
SCREEN_HEIGHT, SCREEN_HEIGHT);
}
void
draw_snake(SDL_Renderer *renderer, Snake_Pos **snake)
{
Snake_Pos *ptr = *snake;
SDL_Rect pos;
while (ptr != NULL) {
pos.x = ptr->x;
pos.y = ptr->y;
pos.w = SCREEN_UNIT;
pos.h = SCREEN_UNIT;
SDL_RenderFillRect(renderer, &pos);
ptr = ptr->next;
}
}
void
draw_fruit(SDL_Renderer *renderer, int *fruit)
{
int rx = fruit[0] + SCREEN_UNIT / 2;
int ry = fruit[1] + SCREEN_UNIT / 2;
/* Midpoint circle algorithm */
int x = SCREEN_UNIT / 2;
int y = 0;
int dx = 1;
int dy = 1;
int err = dx - ((SCREEN_UNIT / 2) << 1);
while (x >= y) {
SDL_RenderDrawLine(renderer,
rx - y, ry + x,
rx + y, ry + x);
SDL_RenderDrawLine(renderer,
rx - x, ry + y,
rx + x, ry + y);
SDL_RenderDrawLine(renderer,
rx - x, ry - y,
rx + x, ry - y);
SDL_RenderDrawLine(renderer,
rx - y, ry - x,
rx + y, ry - x);
if (err <= 0) {
y++;
err += dy;
dy += 2;
}
if (err > 0) {
x--;
dx += 2;
err += dx - ((SCREEN_UNIT / 2) << 1);
}
}
}
void
draw_pipe(SDL_Renderer *renderer, Snake_Pos **pipe)
{
Snake_Pos *ptr = *pipe;
SDL_Rect pos;
while (ptr != NULL) {
pos.x = ptr->x;
pos.y = 0;
pos.w = SCREEN_UNIT;
if (ptr->x + SCREEN_UNIT > SCREEN_HEIGHT)
pos.w -= ptr->x + SCREEN_UNIT - SCREEN_HEIGHT;
pos.h = ptr->y - PIPE_GAP / 2 * SCREEN_UNIT;
SDL_RenderFillRect(renderer, &pos);
pos.y = ptr->y + PIPE_GAP / 2 * SCREEN_UNIT;
pos.h = SCREEN_HEIGHT - ptr->y - SCREEN_UNIT;
SDL_RenderFillRect(renderer, &pos);
ptr = ptr->next;
}
}

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
typedef struct {
SDL_Texture *texture;
SDL_Rect pos;
bool cache;
} Snake_Text;
typedef enum {
SNAKE_FOREGROUND,
SNAKE_BACKGROUND,
SNAKE_BACKGROUND_SHADE,
SNAKE_RED,
SNAKE_GREEN,
SNAKE_BLUE,
SNAKE_YELLOW,
SNAKE_MAGENTA,
SNAKE_CYAN,
SNAKE_WHITE,
SNAKE_BLACK
} Snake_Colour;

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define SCREEN_WIDTH 800
#define SCREEN_HEIGHT 480
#define SCREEN_UNIT 20
#define COLOUR_FOREGROUND_R 51
#define COLOUR_FOREGROUND_G 255
#define COLOUR_FOREGROUND_B 51
#define COLOUR_BACKGROUND_R 40
#define COLOUR_BACKGROUND_G 40
#define COLOUR_BACKGROUND_B 40
#define COLOUR_BACKGROUND_SHADE_R 80
#define COLOUR_BACKGROUND_SHADE_G 80
#define COLOUR_BACKGROUND_SHADE_B 80
#define COLOUR_RED_R 255
#define COLOUR_RED_G 0
#define COLOUR_RED_B 0
#define COLOUR_GREEN_R 0
#define COLOUR_GREEN_G 255
#define COLOUR_GREEN_B 0
#define COLOUR_BLUE_R 0
#define COLOUR_BLUE_G 0
#define COLOUR_BLUE_B 255
#define COLOUR_YELLOW_R 255
#define COLOUR_YELLOW_G 255
#define COLOUR_YELLOW_B 0
#define COLOUR_MAGENTA_R 255
#define COLOUR_MAGENTA_G 0
#define COLOUR_MAGENTA_B 255
#define COLOUR_CYAN_R 0
#define COLOUR_CYAN_G 255
#define COLOUR_CYAN_B 255
#define COLOUR_WHITE_R 255
#define COLOUR_WHITE_G 255
#define COLOUR_WHITE_B 255
#define COLOUR_BLACK_R 0
#define COLOUR_BLACK_G 0
#define COLOUR_BLACK_B 0
#define SCREEN_UNIT_X ((SCREEN_WIDTH - SCREEN_HEIGHT) / 8)
#define SCREEN_UNIT_Y (SCREEN_HEIGHT / 8)
#define SCREEN_SIDE (SCREEN_HEIGHT / SCREEN_UNIT - 1)
#define SCREEN_BLOCK (SCREEN_SIDE * SCREEN_SIDE)

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/*
* Copyright (c) 2019-2020, yzrh <yzrh@noema.org>
*
* SPDX-License-Identifier: Apache-2.0
*/
#define VERSION "0"
#define RELEASE "6"
#define PATCH "2"
#define EXTRA "_3"