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snake.c
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snake.c
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#include "snake.h"
#include "player.h"
#include "apple.h"
#include "score.h"
#include "gen/tiles.inc"
#include "data/font-8x8-full.inc"
typedef enum {
STATE_PLAYING, STATE_DIED, STATE_MENU, STATE_SCORES, STATE_ENTER_NAME
} GameState;
GameState _state = STATE_MENU;
typedef struct {
u16 prev; // Previous buttons that were held
u16 down; // Buttons that are held right now
u16 prsd; // Buttons that were pressed this frame
u16 rlsd; // Buttons that were released this frame
} ButtonData;
ButtonData _btn = {0, 0, 0, 0};
void button_update() {
_btn.down = ReadJoypad(0);
_btn.prsd = _btn.down & (_btn.down ^ _btn.prev);
_btn.rlsd = _btn.prev & (_btn.down ^ _btn.prev);
_btn.prev = _btn.down;
}
void draw_walls() {
for (u8 i = 0; i < SCREEN_TILES_H; i++) {
SetTile(i, 0, TILE_WALL);
SetTile(i, 2, TILE_WALL);
SetTile(i, SCREEN_TILES_V-1, TILE_WALL);
}
for (u8 i = 1; i < SCREEN_TILES_V; i++) {
SetTile(0, i, TILE_WALL);
SetTile(SCREEN_TILES_H-1, i, TILE_WALL);
}
}
bool out_of_bounds(u8 x, u8 y) {
if (x <= 0 || x >= SCREEN_TILES_H-1 ||
y <= 2 || y >= SCREEN_TILES_V-1)
return true;
return false;
}
int main() {
// TODO: sound effects?
GetPrngNumber(GetTrueRandomSeed());
SetFontTable(font);
SetTileTable(TILETAB_TILES);
ClearVram();
static bool _state_first_update = true;
inline void switch_state(u8 state) {
_state = state;
_state_first_update = true;
}
inline bool state_first_updatep() {
if (_state_first_update) {
_state_first_update = false;
return true;
}
return false;
}
load_scores();
while (true) {
WaitVsync(1);
button_update();
switch (_state) {
case STATE_PLAYING: {
if (state_first_updatep()) {
player_init();
apple_create();
}
static bool paused = false;
if (_btn.prsd & BTN_START) {
if (!paused) {
Print(SCREEN_TILES_H/2-3, SCREEN_TILES_V/2-1, PSTR("PAUSED"));
}
paused = !paused;
}
if (paused)
continue;
if (_btn.prsd & BTN_UP) player_turn(BTN_UP);
else if (_btn.prsd & BTN_DOWN) player_turn(BTN_DOWN);
else if (_btn.prsd & BTN_LEFT) player_turn(BTN_LEFT);
else if (_btn.prsd & BTN_RIGHT) player_turn(BTN_RIGHT);
if (player_update()) {
switch_state(STATE_DIED);
break;
}
ClearVram();
draw_walls();
player_draw();
apple_draw();
Print(SCREEN_TILES_H-6-7, 1, PSTR("SCORE: "));
PrintInt(SCREEN_TILES_H-2, 1, player_get_score(), false);
} break;
case STATE_DIED: {
if (state_first_updatep()) {
if (score_highp(player_get_score())) {
switch_state(STATE_ENTER_NAME);
break;
}
player_destroy();
Print(SCREEN_TILES_H/2-5, SCREEN_TILES_V/2-3, PSTR("GAME OVER"));
Print(SCREEN_TILES_H/2-10, SCREEN_TILES_V/2+2, PSTR("PRESS A TO CONTINUE"));
Print(SCREEN_TILES_H/2-10, SCREEN_TILES_V/2+4, PSTR("PRESS START FOR MENU"));
}
if (_btn.prsd & BTN_A)
switch_state(STATE_PLAYING);
if (_btn.prsd & BTN_START)
switch_state(STATE_MENU);
} break;
case STATE_MENU: {
const static u8 L = 8, U = 14;
if (state_first_updatep()) {
ClearVram();
draw_walls();
Print(SCREEN_TILES_H/2-3, 7, PSTR("SNAKE!"));
Print(SCREEN_TILES_H/2-6, 9, PSTR("by bytesquid"));
Print(L, U+0, PSTR("START GAME"));
Print(L, U+2, PSTR("VIEW HIGH SCORES"));
}
static u8 selection = 0;
FontFill(L-2, U, 1, 6, ' ');
PrintChar(L-2, U+2*selection, '>');
if (_btn.prsd & BTN_DOWN || _btn.prsd & BTN_RIGHT)
selection = (selection+1)%2;
if (_btn.prsd & BTN_UP || _btn.prsd & BTN_LEFT)
selection = (2+selection-1)%2;
if (_btn.prsd & BTN_A || _btn.prsd & BTN_START)
switch_state(selection == 0 ? STATE_PLAYING : STATE_SCORES);
} break;
case STATE_SCORES: {
if (state_first_updatep()) {
ClearVram();
draw_walls();
load_scores();
draw_scores();
}
if (_btn.prsd & BTN_START || _btn.prsd & BTN_A)
switch_state(STATE_MENU);
} break;
case STATE_ENTER_NAME: {
static const u8 L = SCREEN_TILES_H/2-8, U = 13;
if (state_first_updatep()) {
ClearVram();
draw_walls();
Print(SCREEN_TILES_H/2-5, 7, PSTR("HIGH SCORE!"));
Print(SCREEN_TILES_H/2-8, 10, PSTR("Enter your name:"));
// Print(SCREEN_TILES_H/2-8, SCREEN_TILES_V-7, PSTR("X = clear letter"));
Print(SCREEN_TILES_H/2-10, SCREEN_TILES_V-7, PSTR("Press START when done"));
PrintInt(SCREEN_TILES_H-8, U, player_get_score(), false);
}
static unsigned char name[8] = "AAAAAAA\0";
static u8 letter = 0;
if (name[letter] == ' ')
name[letter] = 'Z'+1;
if (_btn.prsd & BTN_UP) name[letter]--;
if (_btn.prsd & BTN_DOWN) name[letter]++;
if (_btn.prsd & BTN_SL) name[letter]-=5;
if (_btn.prsd & BTN_SR) name[letter]+=5;
if (name[letter] < 'A')
name[letter] += 27;
name[letter] = (name[letter]-'A') % 27 + 'A';
if (name[letter] == 'Z'+1)
name[letter] = ' ';
if (_btn.prsd & BTN_LEFT) letter = (7+letter-1)%7;
if (_btn.prsd & BTN_RIGHT) letter = (7+letter+1)%7;
FontFill(L, U+1, 8, 1, ' ');
PrintRam(L, U, name);
PrintChar(L+letter, U+1, '^');
if (_btn.prsd & BTN_START) { // || _btn.prsd & BTN_A) {
score_add(name, player_get_score());
save_scores();
player_destroy();
switch_state(STATE_SCORES);
}
} break;
}
}
}