int loadBank(int bank) {

  printf("\nLoading bank %d ...\n", bank);
  memset(samples, 0, sizeof(Mix_Chunk*) * NUM_WAVEFORMS);

  int result = Mix_OpenAudio(44100, AUDIO_S16SYS, 2, 512);
  if( result < 0 ) {
    fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
    exit(-1);
  }

  result = Mix_AllocateChannels(4);
  if( result < 0 ) {
    fprintf(stderr, "Unable to allocate mixing channels: %s\n", SDL_GetError());
    exit(-1);
  }

  char waveFileName[17];

  for( int i = 0; i < NUM_WAVEFORMS; i++ ) {
    sprintf(waveFileName, "banks/BANK%d/%d.wav", bank, i+1);

    samples[i] = Mix_LoadWAV(waveFileName);
    if( samples[i] == NULL ) {
      fprintf(stderr, "Unable to load wave file: %s\n", waveFileName);
    }
  }

  return true;
}


void loadPattern(int patternNum) {
  printf("\nLoading pattern %d ...\n", patternNum);

  FILE *fp;
  char *line = NULL;
  size_t len = 0;
  ssize_t read;
  int lineCount = 0;
  char patternFile[16];

  int bank = 0;
  int cols = 0;
  int rows = 0;

  sprintf(patternFile, "patterns/pattern%d", patternNum);
  fp = fopen(patternFile, "r");
  if(fp == NULL) {exit(EXIT_FAILURE);}

  while ((read = getline(&line, &len, fp)) != -1) {
    if(lineCount == 0) { bank = line[10]-'0'; }
    if(lineCount == 1) { rows = line[10]-'0'; }
    if(lineCount > 1) {
      if(lineCount == 2) {
        cols = read-1;
      }
      for(int i=0; i<cols; i++) {
        pattern[lineCount-2][i] = line[i]-'0';
      }
    }
    lineCount++;
  }

  printf("Pattern: %d\nBank: %d\nColumns: %d\nRows: %d\n", patternNum, bank, cols, rows);

  matrix[0] = rows;
  matrix[1] = cols;


  for(int i=0; i<rows; i++) {
    for(int y=0; y<cols; y++) {
      printf("%d ", pattern[i][y]);
    }
    printf("\n");
  }

  drawRects(0);

  fclose(fp);
  if(line) {free(line);}
  loadBank(bank);
}