 void drawWallLine(uint8_t x, uint8_t h, uint8_t side);
 void rotatePlayer(Player *player, uint8_t right);
 void movePlayer(Player *player);
-void drawDottedLine(int16_t x, int16_t y0, int16_t y1);
 void drawLine(int16_t x, int16_t y0, int16_t y1);
+void drawShadedLine(int16_t x, int16_t y0, int16_t y1);
 void timer_IRQ();
 
 volatile uint8_t timer_flag = 0;

    drawEnd = DISP_HEIGHT;
  }
  if (side){
    display.drawLine(x, drawStart , x, drawEnd, WHITE);
  } else {
    drawDottedLine(x, drawStart , drawEnd); //add shade to y-axis wall to give better contrast
  }
}

void doRayCasting(Player *player) {

  }
}

void drawShadedLine(int16_t x, int16_t y0, int16_t y1) {
  uint16_t color = BLACK;
  uint8_t i = x%2;
  for (; y0>=y1; y0--) {
    i ? i=0:i=1;
    i ? color=WHITE:color=BLACK;
