Class: Amaterasu::HAL::SDL2

Inherits:
Object
  • Object
show all
Defined in:
lib/amaterasu/hal/sdl2.rb,
lib/amaterasu/hal/sdl2/bindings.rb

Defined Under Namespace

Modules: Bindings

Constant Summary collapse

LCD = 
Bindings
LCD_WIDTH = 
160
LCD_HEIGHT = 
144
SCALE = 
3
PALETTE = 
[0xFFFFFFFF, 0xFFAAAAAA, 0xFF555555, 0xFF000000].freeze

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ SDL2

Returns a new instance of SDL2.



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# File 'lib/amaterasu/hal/sdl2.rb', line 17

def initialize
  LCD.init(LCD::INIT_VIDEO)
  @window = LCD.create_window(
    'Amaterasu',
    LCD::WINDOWPOS_CENTERED,
    LCD::WINDOWPOS_CENTERED,
    LCD_WIDTH * SCALE,
    LCD_HEIGHT * SCALE,
    LCD::WINDOW_SHOWN
  )
  @renderer = LCD.create_renderer(@window, -1, LCD::RENDERER_ACCELERATED)
  @texture = LCD.create_texture(
    @renderer,
    LCD::PIXELFORMAT_ARGB8888,
    LCD::TEXTUREACCESS_STREAMING,
    LCD_WIDTH,
    LCD_HEIGHT
  )

  @pixel_buffer = FFI::MemoryPointer.new(:uint32, LCD_WIDTH * LCD_HEIGHT)
  @event = FFI::MemoryPointer.new(:uint8, LCD::EVENT_SIZE)
  @frame_count = 0
  @fps_timer = Process.clock_gettime(Process::CLOCK_MONOTONIC)
end

Instance Attribute Details

#joypad ⇒ Object

Returns the value of attribute joypad.



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# File 'lib/amaterasu/hal/sdl2.rb', line 15

def joypad
  @joypad
end

Instance Method Details

#draw(framebuffer) ⇒ Object 



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# File 'lib/amaterasu/hal/sdl2.rb', line 42

def draw(framebuffer)
  @pixel_buffer.write_array_of_uint32(framebuffer.map { |shade| PALETTE[shade] })
  LCD.update_texture(@texture, FFI::Pointer::NULL, @pixel_buffer, LCD_WIDTH * 4)
  LCD.render_copy(@renderer, @texture, FFI::Pointer::NULL, FFI::Pointer::NULL)
  LCD.render_present(@renderer)

  @frame_count += 1
  @elapsed = Process.clock_gettime(Process::CLOCK_MONOTONIC) - @fps_timer

  if @elapsed >= 1.0
    fps = @frame_count / @elapsed
    # LCD.set_window_title(@window, "Amaterasu | FPS: #{fps.round(2)}")
    $stdout.print "\rFPS: #{fps.round(2)}  "
    $stdout.flush
  end

  while LCD.poll_event(@event) == 1
    # first 4 bytes of the event struct are the event type (uint32)
    type = @event.read_uint32
    case type
    when LCD::QUIT
      shutdown
      exit
    end
  end

  keyboard_state = LCD.get_keyboard_state(nil)

  if keyboard_state.get_uint8(LCD::SCANCODE_UP) == 0
    joypad.release_dpad(:up)
  else
    joypad.press_dpad(:up)
  end

  if keyboard_state.get_uint8(LCD::SCANCODE_DOWN) == 0
    joypad.release_dpad(:down)
  else
    joypad.press_dpad(:down)
  end

  if keyboard_state.get_uint8(LCD::SCANCODE_RIGHT) == 0
    joypad.release_dpad(:right)
  else
    joypad.press_dpad(:right)
  end

  if keyboard_state.get_uint8(LCD::SCANCODE_LEFT) == 0
    joypad.release_dpad(:left)
  else
    joypad.press_dpad(:left)
  end

  if keyboard_state.get_uint8(LCD::SCANCODE_Z) == 0
    joypad.release_face(:a)
  else
    joypad.press_face(:a)
  end

  if keyboard_state.get_uint8(LCD::SCANCODE_X) == 0
    joypad.release_face(:b)
  else
    joypad.press_face(:b)
  end

  if keyboard_state.get_uint8(LCD::SCANCODE_RETURN) == 0
    joypad.release_face(:start)
  else
    joypad.press_face(:start)
  end

  if keyboard_state.get_uint8(LCD::SCANCODE_RSHIFT) == 0
    joypad.release_face(:select)
  else
    joypad.press_face(:select)
  end
end

#shutdown ⇒ Object 



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# File 'lib/amaterasu/hal/sdl2.rb', line 119

def shutdown
  LCD.destroy_texture(@texture)
  LCD.destroy_renderer(@renderer)
  LCD.destroy_window(@window)
  LCD.quit
end