Python+Pygame开发CHIP-8模拟器无渲染输出问题求助

用Python结合Pygame开发CHIP-8模拟器，完成所有指令添加后尝试渲染IBM logo时，完全没有任何输出。排查后发现负责渲染的render方法甚至未被调用。

相关代码片段 #

渲染指令实现代码 #

def drw_vx_vy(self):
    width = 8
    height = self.opcode & 0xF
    print("drw")

    self.v[0xF] = 0

    for row in range(height):
        sprite = self.memory[self.i + row]

        for col in range(width):
            if (sprite & 0x80) > 0:
                self.display.draw_pixel(self.v[self.x] + col, self.v[self.y] + row)
                self.v[0xF] = 1

            sprite = sprite << 1

Display类渲染相关代码 #

def draw_pixel(self, x, y):
    if x > self.width:
        x -= self.width
    elif x < 0:
        x += self.width

    if y > self.height:
        x -= self.height
    elif x < 0:
        x += self.height
    
    pixelLoc = x + (y * self.height)
    self.pixels[pixelLoc] = self.pixels[pixelLoc] ^ 1
    print(self.pixels[pixelLoc])

    return not self.pixels[pixelLoc]

    # pygame.draw.rect(self.surface, (255,255,255), (
    #     x * self.scale, y * self.scale, self.scale, self.scale)
    # )

def clear_display(self):
    self.screen.fill((0,0,0))

def render(self):
    self.clear_display()
    for i in range(self.width * self.height):
        x = (i % self.width) * self.scale
        y = i / self.width * self.scale

        if self.pixels[i]:
            pygame.draw.rect(self.surface, (255,255,255), (
                x, y, self.scale, self.scale)
            )

    pygame.display.update()

已检查过drw_vx_vy函数是否放在错误的case语句中，确认没问题。开发时参考了FreeCodeCamp的CHIP-8模拟器开发指南（原指南为JavaScript实现，已适配为Python版本）。

内容的提问来源于stack exchange，提问作者TechStudent10