tetoris_c

#include "main.h"

tetromino playfield[FULL_HEIGHT][FULL_WIDTH] = {};

uint8_t graying[FULL_HEIGHT][FULL_WIDTH] = {};

int main () {

  /* Setting up the seed */

  srand(time(NULL));

  /* Setting up terminal with termios */

  struct termios old, new;

  tcgetattr(STDIN_FILENO, &old);

  new = old;

  new.c_lflag &= ~(ECHO | ICANON);

  new.c_cc[VMIN] = 0;

  new.c_cc[VTIME] = 0;

  tcsetattr(STDIN_FILENO, TCSANOW, &new);

  struct winsize init_size, current_size;

  ioctl(STDOUT_FILENO, TIOCGWINSZ, &init_size);

  current_size = init_size;

  printf("\033[?25l\033[?1049h\033[2J\033[H");

  /* Polling */

  struct pollfd polling[1];

  polling[0].fd = 0;

  polling[0].events = POLLIN;

  /* Init */

  init_field();

  bool blink[FIELD_HEIGHT] = {};

  bool is_piece = false;

  bool paused = false;

  piece current_piece = {};

  piece next_piece = init_piece((rand() % Z_PIECE) + 1);

  /* Time keeping */

  struct timespec start, current;

  clock_gettime(CLOCK_MONOTONIC_RAW, &start);

  uint64_t time_acc = 0;

  uint16_t tick_fall = 0;

  uint16_t tick_blink = 0;

  uint16_t tick_spin = 0;

  uint16_t tick_gray = 0;

  uint8_t i;

  bool is_tetris = false;

  /* Game Loop */

  while (true) {

    int8_t move = 0;

    bool down = false;

    bool draw = false;

    bool rotate = false;

    /* Polling for input */

    int is_poll = poll(polling, 1, paused ? -1 : 17);

    /* Dealing with Ticks */

    uint16_t ticks = 0;

    {

      clock_gettime(CLOCK_MONOTONIC_RAW, &current);

      uint64_t time_diff = 

        (current.tv_sec - start.tv_sec) * 1000000000ULL + 

        (current.tv_nsec - start.tv_nsec) + time_acc;

      if (!paused) {

        while (time_diff >= FRAME) {

          time_diff -= FRAME;

          ticks++;

        }

        time_acc = time_diff;

      }

      start = current;

    }

    /* Take care of the input */

    if (is_poll > 0 && polling[0].revents & POLLIN) {

      char buf[10] = {};

      if (read(STDIN_FILENO, buf, sizeof(buf)) > 0) {

        if (tolower(buf[0]) == 'q') {

          break;

        }

        if (tolower(buf[0]) == 'p') {

          if (paused) {

            paused = false;

          } else {

            draw_pause();

            paused = true;

          }

        }

        if (buf[0] == '\033' && buf[1] == '[') {

          switch (buf[2]) {

            case 'A':

              rotate = true;

              break;

            case 'B':

              down = true;

              break;

            case 'C':

              move = 1;

              break;

            case 'D':

              move = -1;

              break;

            default:

              break;

          }

        }

      }

    }

    if (paused)

      continue;

    /* Dealing with cleared Lines */

    if (is_tetris) {

      tick_blink += ticks;

      while (tick_blink >= BLINK && i < 4) { 

        tick_blink -= BLINK;

        draw_board(current_piece, next_piece, (i % 2 == 0) ? blink : NULL, is_piece);

        i++;

      }

      if (i == 4) {

        int8_t j, k;

        for (j = 0; j < FIELD_HEIGHT; j++) {

          if (blink[j]) {

            for (k = j; k > 0; k--) {

              int8_t l;

              for (l = 0; l < FIELD_WIDTH; l++) {

                playfield[k][l + BORDER_WIDTH] = playfield[k - 1][l + BORDER_WIDTH];

                graying[k][l + BORDER_WIDTH] = graying[k - 1][l + BORDER_WIDTH];

              }

            }

          }

        }

        i = 0;

        is_tetris = false;

      }

      continue;

    }

    /* Creates new piece */

    if (!is_piece) {

      current_piece = next_piece;

      next_piece = init_piece((rand() % Z_PIECE) + 1);

      is_piece = true;

      draw = true;

      tick_fall = tick_blink = tick_spin = 0;

    }

    /* Move piece */

    if (move != 0) {

      if (

        current_piece.x + move >= 0 && 

        current_piece.x + move + current_piece.size <= FULL_WIDTH

      ) {

        piece moved_piece = current_piece;

        moved_piece.x += move;

        if (valid_position(moved_piece)) {

          current_piece.x += move;

          draw = true;

        }

      }

    }

    /* Piece rotates */

    if (tick_spin < SPIN)

      tick_spin += ticks;

    if (rotate && current_piece.positions > 1 && tick_spin >= SPIN) {

      piece rotated = current_piece;

      rotated.rotation = (current_piece.rotation + 1) % (current_piece.positions);

      if (valid_position(rotated)) {

        current_piece = rotated;

        draw = true;

      }

      tick_spin = 0;

    } 

    /* Piece falls */

    tick_fall += ticks;

    while (tick_fall >= FALL || down) {

      current_piece.y++;

      if (tick_fall >= FALL)

        tick_fall -= FALL;

      down = false;

      draw = true;

    }

    /* When a piece is stuck */

    if (!valid_position(current_piece)) {

      int8_t j, k;

      for (j = 0; j < current_piece.size; j++) {

        for (k = 0; k < current_piece.size; k++) {

          if (current_piece.piece[j][k]) {

            coord solid = find_direction(current_piece, k, j);

            playfield[current_piece.y - 1 + solid.y][current_piece.x + solid.x] = current_piece.name;

          }

        }

      }

      is_piece = false;

      draw = true;

    }

    /* Looks if there is a tetris */

    int8_t j, k;

    for (j = FIELD_HEIGHT - 1; j >= 0; j--) {

      uint8_t blocked = 0;

      for (k = 0; k < FIELD_WIDTH; k++) {

        if (playfield[j][k + BORDER_WIDTH] != EMPTY)

          blocked++;

      }

      if (blocked == 10) {

        blink[j] = true;

        is_tetris = true;  

      } else {

        blink[j] = false;

      }

    }

    /* Looks for game over */

    for (j = 0; j < FIELD_WIDTH; j++) {

      if (playfield[TOP_GAP][j + BORDER_WIDTH] > 0) {

        draw_board(current_piece, next_piece, NULL, is_piece);

        sleep(2);

        printf("\033[2J\033[H");

        printf("HAHA LOSER\n");

        sleep(1);

        goto end;

      }

    }

    /* Graying out of old pieces */

    tick_gray += ticks;

    while (tick_gray >= GRAY){

      uint8_t j, k;

      for (j = 0; j < FULL_HEIGHT; j++) {

        for (k = 0; k < FULL_WIDTH; k++) {

          if (playfield[j][k] != EMPTY) {

            if (graying[j][k] < 255) {

              graying[j][k] += 1;

            }

          } else {

            graying[j][k] = 0;

          }

        }

      }

      tick_gray -= GRAY;

    }

    if (draw)

      draw_board(current_piece, next_piece, NULL, is_piece);

  }

end:

  printf("\033[?1049l\033[?25h");

  tcsetattr(STDIN_FILENO, TCSANOW, &old);

  return 0;

}