Class: Ppu

Inherits:
Object
  • Object
show all
Defined in:
lib/ppu.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Ppu

Returns a new instance of Ppu.



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# File 'lib/ppu.rb', line 9

def initialize()
  @ppu = [0]*0x4000
  @registers = {}
  Registers.each {|adresse| @registers[adresse] = 0}
  init_affichage
end

Instance Attribute Details

#ppu ⇒ Object

Returns the value of attribute ppu.



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# File 'lib/ppu.rb', line 4

def ppu
  @ppu
end

#registers ⇒ Object

Returns the value of attribute registers.



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# File 'lib/ppu.rb', line 5

def registers
  @registers
end

#screen ⇒ Object

Returns the value of attribute screen.



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# File 'lib/ppu.rb', line 6

def screen
  @screen
end

Instance Method Details

#clear_vblank ⇒ Object 



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# File 'lib/ppu.rb', line 78

def clear_vblank()
  @registers[0x2002] = @registers[0x2002].clear_bit(7) #Clear du Vblank
end

#color?(color) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ppu.rb', line 42

def color?(color)
  rgb = case color
    when 0 then [124,124,124]
    when 1 then [0,0,22]
    when 2 then [0,0,18]
    when 3 then [64,40,188]
  end
  return rgb
end

#draw_screen ⇒ Object 



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# File 'lib/ppu.rb', line 83

def draw_screen()
  @screen.putPixel(@x,@y,color?(get_pixel(@x,@y)))
  @x+=1
  if @x>255
    @x = 0
    @y+=1
  elsif @y>239
    reset_pixel
  end

end

#get_bit(liste_octets, ligne, bit) ⇒ Object 



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# File 'lib/ppu.rb', line 29

def get_bit(liste_octets,ligne,bit)
  return (liste_octets[ligne].bit?(7-bit) | liste_octets[ligne+8].bit?(7-bit) << 1)
end

#get_pixel(x, y) ⇒ Object 



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# File 'lib/ppu.rb', line 33

def get_pixel(x,y)
  set_tables
  pos_tile = (y/8)*32+(x/8)
  index = @table_nommage_screen[pos_tile] * 16
  pixel = get_bit(@screen_pattern_table[index..index+15],y%8,x%8)
  return pixel
  
end

#init_affichage ⇒ Object 



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# File 'lib/ppu.rb', line 17

def init_affichage()
  SDL.init SDL::INIT_VIDEO
  @screen = SDL::set_video_mode 256, 240, 32, SDL::SWSURFACE
  reset_pixel
end

#reset_pixel ⇒ Object 



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# File 'lib/ppu.rb', line 24

def reset_pixel()
  @x = @y = 0
end

#set_tables ⇒ Object 



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# File 'lib/ppu.rb', line 52

def set_tables()
  @sprite_pattern_table = case @registers[0x2000].bit?(3)
    when 0 then @ppu[0x0..0x0FFF]
    when 1 then @ppu[0x1000..0x1FFF]
  end

  @screen_pattern_table = case @registers[0x2000].bit?(4)
    when 0 then @ppu[0x0..0x0FFF]
    when 1 then @ppu[0x1000..0x1FFF]
  end
  
  @sprite_size = @registers[0x2000].bit?(5)

  @table_nommage_screen = @ppu[0x2000..0x23C0]   if @registers[0x2000].bit?(1) == 0 and @registers[0x2000].bit?(0) == 0
  @table_nommage_screen = @ppu[0x2400..0x27C0]   if @registers[0x2000].bit?(1) == 0 and @registers[0x2000].bit?(0) == 1
  @table_nommage_screen = @ppu[0x2800..0x2BC0]   if @registers[0x2000].bit?(1) == 1 and @registers[0x2000].bit?(0) == 0
  @table_nommage_screen = @ppu[0x2C00..0x2FC0]   if @registers[0x2000].bit?(1) == 1 and @registers[0x2000].bit?(0) == 1
  

end

#set_vblank ⇒ Object 



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# File 'lib/ppu.rb', line 74

def set_vblank()
  @registers[0x2002] = @registers[0x2002].set_bit(7) #Set du Vblank
end