Class: Amaterasu::GameBoy::Ppu::Modes::Rendering::PixelEmitter

Inherits:
Object
  • Object
show all
Defined in:
lib/amaterasu/game_boy/ppu/modes/rendering/pixel_emitter.rb

Overview

Responsible for emitting pixels from the Pixel FIFO to the Display.

Constant Summary collapse

PIXELS_PER_SCANLINE = 
160

Instance Method Summary collapse

Constructor Details

#initialize(ppu, bg_win_fifo, sprite_fifo) ⇒ PixelEmitter

Returns a new instance of PixelEmitter.



12
13
14
15
16
17
18
19
 
# File 'lib/amaterasu/game_boy/ppu/modes/rendering/pixel_emitter.rb', line 12

def initialize(ppu, bg_win_fifo, sprite_fifo)
  @ppu = ppu
  @bg_win_fifo = bg_win_fifo
  @sprite_fifo = sprite_fifo

  @pixels_discarded = 0
  @pixels_emitted = 0
end

Instance Method Details

#reset_for_scanline ⇒ Object 



38
39
40
41
 
# File 'lib/amaterasu/game_boy/ppu/modes/rendering/pixel_emitter.rb', line 38

def reset_for_scanline
  @pixels_emitted = 0
  @pixels_discarded = 0
end

#tick? ⇒ Boolean

Called each T-cycle.

Returns:

  • (Boolean) 


22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
 
# File 'lib/amaterasu/game_boy/ppu/modes/rendering/pixel_emitter.rb', line 22

def tick?
  return false if @bg_win_fifo.empty?
  return false unless @pixels_emitted < PIXELS_PER_SCANLINE

  @popped_sprite_pixel = @sprite_fifo.pop_pixel
  @popped_bg_win_pixel = @bg_win_fifo.pop_pixel

  shaded_priority_pixel = define_pixel_priority

  # TODO: Implement framebuffer fixed size [lcd_y * width + lcd_x]
  @ppu.framebuffer << shaded_priority_pixel
  @pixels_emitted += 1

  true
end

#to_s ⇒ Object 



43
44
45
46
 
# File 'lib/amaterasu/game_boy/ppu/modes/rendering/pixel_emitter.rb', line 43

def to_s
  "BG WIN FIFO: #{@bg_win_fifo.pixels} | " \
    "Popped: #{@popped_pixel} (##{format('%d', @pixels_discarded)})"
end