Module: GBRb::Graphics::ModeClock

Included in:
GPU
Defined in:
lib/gbrb/graphics/mode_clock.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#mode ⇒ Object (readonly)

Returns the value of attribute mode.



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# File 'lib/gbrb/graphics/mode_clock.rb', line 5

def mode
  @mode
end

Instance Method Details

#reset ⇒ Object 



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# File 'lib/gbrb/graphics/mode_clock.rb', line 7

def reset
  @clock = 0
  @mode = 0
  self.line = 0
end

#update!(time_increment) ⇒ Object 



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# File 'lib/gbrb/graphics/mode_clock.rb', line 13

def update! time_increment
  unless self.display_on?
    self.line = 0
    @clock = 456
    @mode = 0
    return
  else
    if line >= 144
      @mode = 1
    elsif @clock >= 456 - 80
      @mode = 2
    elsif @clock >= 456 - 80 - 172
      @mode = 3
    else
      @mode = 0
    end
  end


  @clock -= time_increment

  if @clock <= 0
    @clock += 456
    self.line = line + 1

    if line == 144
      self.draw_frame_buffer
    elsif line > 153
      self.line = 0
    end

    if line < 144
      if self.display_on?
        render_scan_line
      end
    end
  end
end