def test_display_sprite(self):
chip = Chip8()
program = BytesIO(b'\xD2\x33\xD2\x31')
chip.registers.i = 80
chip.memory.set(80, b'\x3C\xC3\xFF')
chip.load_game(program)
chip.emulate_cycle()
gfx_line1 = chip.graphics.get_gfx_state(2, 3, 8)
gfx_line2 = chip.graphics.get_gfx_state(2, 4, 8)
gfx_line3 = chip.graphics.get_gfx_state(2, 5, 8)
assert gfx_line1 == [0, 0, 1, 1, 1, 1, 0, 0]
assert gfx_line2 == [1, 1, 0, 0, 0, 0, 1, 1]
assert gfx_line3 == [1, 1, 1, 1, 1, 1, 1, 1]
assert chip.registers.v[15] == 0
chip.memory.set_byte(84, 0x24)
chip.registers.i = 84
chip.emulate_cycle()
gfx_line1 = chip.graphics.get_gfx_state(2, 3, 8)
assert gfx_line1 == [0, 0, 0, 1, 1, 0, 0, 0]
assert chip.registers.v[15] == 1
def test_set_program_counter(self):
chip = Chip8()
program = BytesIO(b'\x15\x42')
chip.load_game(program)
chip.emulate_cycle()
assert chip.program_counter.value == 0x0542
def test_set_v_register(self):
chip = Chip8()
program = BytesIO(b'\x67\x42')
chip.load_game(program)
chip.emulate_cycle()
assert chip.registers.v[7] == 0x0042
def test_set_index_register(self):
chip = Chip8()
program = BytesIO(b'\xA0\x01')
chip.load_game(program)
chip.emulate_cycle()
assert chip.registers.i == 1
def __init__(self, file):
self.height = 500
self.width = 1000
self.blockSize = self.height / 32 #15
self.window = pygame.display.set_mode((self.width, self.height))
self.clock = pygame.time.Clock()
self.chip8 = Chip8()
self.file = file
def __init__(self, rom_file):
self.chip = Chip8(rom_file)
self.paused = False
self.manual_step_mode = False
self.should_step = False
pyxel.init(64, 64, fps=100, scale=10)
pyxel.run(self.update, self.draw)
def test_jump_w_offset(self):
chip = Chip8()
program = BytesIO(b'\xB1\x11')
chip.registers.v[0] = 1
chip.load_game(program)
chip.emulate_cycle()
assert chip.program_counter.value == 0x112
def test_set_random(self):
chip = Chip8()
program = BytesIO(b'\xC1\x0D')
random.seed(2)
chip.load_game(program)
chip.emulate_cycle()
assert chip.registers.v[1] == 0xC
def test_return(self):
chip = Chip8()
stack_pc = 100
chip.stack.append(stack_pc)
program = BytesIO(b'\x00\xEE')
chip.load_game(program)
chip.emulate_cycle()
assert chip.program_counter.value == stack_pc + 2
def test_bitwise_and(self):
chip = Chip8()
program = BytesIO(b'\x87\x42')
chip.load_game(program)
chip.registers.v[4] = 0x0F
chip.registers.v[7] = 0x13
chip.emulate_cycle()
assert chip.registers.v[7] == 0x03
def test_call_subroutine(self):
chip = Chip8()
program = BytesIO(b'\x25\x42')
chip.load_game(program)
orig_pc = chip.program_counter.value
chip.emulate_cycle()
assert chip.program_counter.value == 0x0542
assert chip.stack.pop() == orig_pc
def test_move_to_char_address(self):
chip = Chip8()
program = BytesIO(b'\xF4\x29')
chip.registers.v[4] = 0xA
orig_pc = chip.program_counter.value
chip.load_game(program)
chip.emulate_cycle()
assert chip.registers.i == 50
assert chip.program_counter.value == orig_pc + 2
def test_xor(self):
chip = Chip8()
program = BytesIO(b'\x87\x43')
chip.load_game(program)
chip.registers.v[4] = 0x03
chip.registers.v[7] = 0x11
chip.emulate_cycle()
assert chip.registers.v[7] == 0x12
def test_add_to_v_register(self):
chip = Chip8()
program = BytesIO(b'\x78\x05\x78\xFD')
chip.load_game(program)
chip.emulate_cycle()
assert chip.registers.v[8] == 0x0005
chip.emulate_cycle()
assert chip.registers.v[8] == 0x0002
def test_nonequal_condition(self):
chip = Chip8()
program = BytesIO(b'\x41\x01')
chip.load_game(program)
chip.registers.v[1] = 0
orig_pc = chip.program_counter.value
chip.emulate_cycle()
assert chip.program_counter.value == orig_pc + 4
def test_clear_screen(self):
chip = Chip8()
test_pixel = chip.graphics.pixel_at(5, 6)
test_pixel.set()
program = BytesIO(b'\x00\xE0')
chip.load_game(program)
chip.emulate_cycle()
assert (not test_pixel.is_on)
def test_assignment(self):
chip = Chip8()
program = BytesIO(b'\x87\x40')
chip.load_game(program)
chip.registers.v[4] = 1
chip.registers.v[7] = 0
chip.emulate_cycle()
assert chip.registers.v[7] == 1
def test_set_sound_timer(self):
chip = Chip8()
program = BytesIO(b'\xF2\x18')
chip.registers.v[2] = 5
orig_pc = chip.program_counter.value
chip.load_game(program)
chip.emulate_cycle()
assert chip.timers.sound_timer == 4
assert chip.program_counter.value == orig_pc + 2
def test_get_delay_timer(self):
chip = Chip8()
program = BytesIO(b'\xF6\x07')
chip.timers.delay_timer = 7
orig_pc = chip.program_counter.value
chip.load_game(program)
chip.emulate_cycle()
assert chip.registers.v[6] == 7
assert chip.program_counter.value == orig_pc + 2
def test_add_to_address_register(self):
chip = Chip8()
program = BytesIO(b'\xF3\x1E')
chip.registers.v[3] = 16
chip.registers.i = 250
orig_pc = chip.program_counter.value
chip.load_game(program)
chip.emulate_cycle()
assert chip.registers.i == 10
assert chip.program_counter.value == orig_pc + 2
def test_equal_condition(self):
chip = Chip8()
program = BytesIO(b'\x90\x10')
chip.load_game(program)
chip.registers.v[0] = 1
chip.registers.v[1] = 1
orig_pc = chip.program_counter.value
chip.emulate_cycle()
assert chip.program_counter.value == orig_pc + 2
def test_shift_left(self):
chip = Chip8()
program = BytesIO(b'\x87\x4E\x87\x4E')
chip.load_game(program)
chip.registers.v[7] = 0x81
chip.emulate_cycle()
assert chip.registers.v[7] == 2
assert chip.registers.v[0xF] == 1
chip.emulate_cycle()
assert chip.registers.v[7] == 4
assert chip.registers.v[0xF] == 0
def __init__(self, file):
print("Loading from \"{}\"".format(file))
self.chip8 = Chip8()
self.rom = self.load_from_file(file)
self.TITLE = "CHIP8 Emulator"
self.PIXEL_SIZE = 10
self.WIDTH = 64
self.HEIGHT = 32
self.SIZE = [
self.WIDTH * self.PIXEL_SIZE, self.HEIGHT * self.PIXEL_SIZE
]
self.MAX_TICKS_PER_SECOND = 60
pygame.init()
def test_shift_right(self):
chip = Chip8()
program = BytesIO(b'\x87\x46\x87\x46')
chip.load_game(program)
chip.registers.v[7] = 2
chip.emulate_cycle()
assert chip.registers.v[7] == 1
assert chip.registers.v[0xF] == 0
chip.emulate_cycle()
assert chip.registers.v[7] == 0
assert chip.registers.v[0xF] == 1
def test_jump_when_key_not_pressed(self):
chip = Chip8()
program = BytesIO(b'\xE2\xA1\xE2\xA1')
chip.registers.v[2] = 5
chip.keys.press_key(5)
orig_pc = chip.program_counter.value
chip.load_game(program)
chip.emulate_cycle()
assert chip.program_counter.value == orig_pc + 2
chip.keys.release_key(5)
orig_pc = chip.program_counter.value
chip.emulate_cycle()
assert chip.program_counter.value == orig_pc + 4
def test_addition(self):
chip = Chip8()
program = BytesIO(b'\x87\x44\x87\x44')
chip.load_game(program)
chip.registers.v[4] = 0x01
chip.registers.v[7] = 0x10
chip.emulate_cycle()
assert chip.registers.v[7] == 0x11
assert chip.registers.v[0xF] == 0
chip.registers.v[4] = 0xFF
chip.emulate_cycle()
assert chip.registers.v[7] == 0x10
assert chip.registers.v[0xF] == 1
def test_sub_x_y(self):
chip = Chip8()
program = BytesIO(b'\x87\x45\x87\x45')
chip.load_game(program)
chip.registers.v[4] = 0x01
chip.registers.v[7] = 0x10
chip.emulate_cycle()
assert chip.registers.v[7] == 0x0F
assert chip.registers.v[0xF] == 0
chip.registers.v[4] = 0x10
chip.emulate_cycle()
assert chip.registers.v[7] == 0xFF
assert chip.registers.v[0xF] == 1
def test_get_key(self):
chip = Chip8()
program = BytesIO(b'\xF3\x0A')
chip.registers.v[3] = 9
orig_pc = chip.program_counter.value
chip.load_game(program)
chip.emulate_cycle()
# With no key pressed operation should "block"
assert chip.program_counter.value == orig_pc
assert chip.registers.v[3] == 9
chip.keys.press_key(13)
chip.emulate_cycle()
assert chip.registers.v[3] == 13
assert chip.program_counter.value == orig_pc + 2
def test_sub_y_x(self):
chip = Chip8()
program = BytesIO(b'\x87\x47\x87\x47')
chip.load_game(program)
chip.registers.v[4] = 0x01
chip.registers.v[7] = 0x10
chip.emulate_cycle()
assert chip.registers.v[7] == 0xF1
assert chip.registers.v[0xF] == 1
chip.registers.v[4] = 0x20
chip.registers.v[7] = 0x10
chip.emulate_cycle()
assert chip.registers.v[7] == 0x10
assert chip.registers.v[0xF] == 0
def main(chip_program):
with open(chip_program, "rb") as chip_file:
grid_rect = graphic_grid(SIZE, MODIFIER)
# initialize pygame
pygame.mixer.pre_init(44100, -16, 1)
pygame.init()
screen = pygame.display.set_mode((WIDTH * MODIFIER, HEIGHT * MODIFIER))
pygame.display.set_caption("Chip8 Interpreter")
pygame.mouse.set_visible(0)
# background = pygame.Surface(screen.get_size())
# background = background.convert()
clock = pygame.time.Clock()
font = pygame.font.SysFont("monospace", 24)
# startup chip8
chip8 = Chip8(chip_file)
# Change to boot screen
active_scene = scenes.BootScene(pygame.time.get_ticks(), chip8)
active_scene = active_scene.next
# Event loop
while active_scene != None:
pressed_keys = pygame.key.get_pressed()
filtered_events = []
for event in pygame.event.get():
quit_attempt = False
if event.type == pygame.QUIT:
quit_attempt = True
if quit_attempt:
active_scene.terminate()
else:
filtered_events.append(event)
active_scene.process_input(filtered_events, pressed_keys)
active_scene.update()
active_scene.render(screen, grid_rect, font, clock)
active_scene = active_scene.next
pygame.display.update()
clock.tick(60)