//DXYN - Draws a sprite at coordinate (VX, VY) that has a width of 8 pixels and a height of N pixels.
//Each row of 8 pixels is read as bit-coded starting from memory location I; I value doesn’t change after the execution of this instruction.
// As described above, VF is set to 1 if any screen pixels are flipped from set to unset when the sprite is drawn, and to 0 if that doesn’t happen
void ChipEight::DrawSpriteatVXandVYandN(uint16_t opcode){
    //Get the x, y coordinates
    int rX = this->registers[(opcode & 0x0F00) >> 8];
    int rY = this->registers[(opcode & 0x00F0) >> 4];
    int height = opcode & 0x000F;

    //We don't know if we've flipped any bits yet, so set to 0 for now.
    this->registers[0xF] = 0;

    //Loop for how many rows we want the sprite to be.
    for (int row = 0; row < height; row++)
    {
        //The pixel is just one ROW of the SPRITE which is N rows
        uint8_t pixel = this->memory[iRegister + row]; //Get each row of the sprite by incrementing I

        for (int col = 0; col < 8; col++) //Each sprite is 8 units wide
        {
            //Get the bit we want to check if it's set:
            int bit = pixel & (0b10000000 >> col);

            //Check if the bit is set
            if(bit != 0)
            {
                //We want to draw, but we must check if the bit is already set here:
                if(this->display[rX + col][rY + row] == 1)
                {
                    //It is set, so we need to set the 0xF register because we will erase.
                    this->registers[0xF] = 1;
                }

                //XOR the position with 1, which will flip the bit.
                this->display[rX + col][rY + row] ^= 1;
           }
        }
    }
    IncrementProgramCounter();
}