Class: Doom::Platform::GosuWindow

Inherits:
Gosu::Window
  • Object
show all
Defined in:
lib/doom/platform/gosu_window.rb

Constant Summary collapse

SCALE = 
3
MOVE_SPEED =

Movement constants

8.0
TURN_SPEED =

Units per frame

3.0
MOUSE_SENSITIVITY =

Degrees per frame

0.15
PLAYER_RADIUS =

Mouse look sensitivity

16.0

Instance Method Summary collapse

Constructor Details

#initialize(renderer, palette, map) ⇒ GosuWindow

Collision radius



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# File 'lib/doom/platform/gosu_window.rb', line 16

def initialize(renderer, palette, map)
  super(Render::SCREEN_WIDTH * SCALE, Render::SCREEN_HEIGHT * SCALE, false)
  self.caption = 'Doom Ruby'

  @renderer = renderer
  @palette = palette
  @map = map
  @screen_image = nil
  @mouse_captured = false
  @last_mouse_x = nil

  # Pre-build palette lookup for speed
  @palette_rgba = palette.colors.map { |r, g, b| [r, g, b, 255].pack('CCCC') }
end

Instance Method Details

#button_down(id) ⇒ Object 



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# File 'lib/doom/platform/gosu_window.rb', line 214

def button_down(id)
  case id
  when Gosu::KB_ESCAPE
    if @mouse_captured
      @mouse_captured = false
      self.mouse_x = width / 2
      self.mouse_y = height / 2
    else
      close
    end
  when Gosu::MS_LEFT, Gosu::KB_TAB
    unless @mouse_captured
      @mouse_captured = true
      @last_mouse_x = mouse_x
    end
  end
end

#draw ⇒ Object 



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# File 'lib/doom/platform/gosu_window.rb', line 201

def draw
  # Fast RGBA conversion using pre-built palette
  rgba = @renderer.framebuffer.map { |idx| @palette_rgba[idx] }.join

  @screen_image = Gosu::Image.from_blob(
    Render::SCREEN_WIDTH,
    Render::SCREEN_HEIGHT,
    rgba
  )

  @screen_image.draw(0, 0, 0, SCALE, SCALE)
end

#handle_input ⇒ Object 



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# File 'lib/doom/platform/gosu_window.rb', line 36

def handle_input
  # Mouse look
  handle_mouse_look

  # Keyboard turning
  if Gosu.button_down?(Gosu::KB_LEFT)
    @renderer.turn(TURN_SPEED)
  end
  if Gosu.button_down?(Gosu::KB_RIGHT)
    @renderer.turn(-TURN_SPEED)
  end

  # Forward/backward movement
  move_x = 0.0
  move_y = 0.0

  if Gosu.button_down?(Gosu::KB_UP) || Gosu.button_down?(Gosu::KB_W)
    move_x += @renderer.cos_angle * MOVE_SPEED
    move_y += @renderer.sin_angle * MOVE_SPEED
  end
  if Gosu.button_down?(Gosu::KB_DOWN) || Gosu.button_down?(Gosu::KB_S)
    move_x -= @renderer.cos_angle * MOVE_SPEED
    move_y -= @renderer.sin_angle * MOVE_SPEED
  end

  # Strafe
  if Gosu.button_down?(Gosu::KB_A)
    move_x += @renderer.sin_angle * MOVE_SPEED
    move_y -= @renderer.cos_angle * MOVE_SPEED
  end
  if Gosu.button_down?(Gosu::KB_D)
    move_x -= @renderer.sin_angle * MOVE_SPEED
    move_y += @renderer.cos_angle * MOVE_SPEED
  end

  # Apply movement with collision detection
  if move_x != 0.0 || move_y != 0.0
    try_move(move_x, move_y)
  end
end

#handle_mouse_look ⇒ Object 



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# File 'lib/doom/platform/gosu_window.rb', line 182

def handle_mouse_look
  return unless @mouse_captured

  current_x = mouse_x
  if @last_mouse_x
    delta_x = current_x - @last_mouse_x
    @renderer.turn(-delta_x * MOUSE_SENSITIVITY) if delta_x != 0
  end

  # Keep mouse centered
  center_x = width / 2
  if (current_x - center_x).abs > 50
    self.mouse_x = center_x
    @last_mouse_x = center_x
  else
    @last_mouse_x = current_x
  end
end

#line_circle_intersect?(x1, y1, x2, y2, cx, cy, radius) ⇒ Boolean 



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# File 'lib/doom/platform/gosu_window.rb', line 154

def line_circle_intersect?(x1, y1, x2, y2, cx, cy, radius)
  # Vector from line start to circle center
  dx = cx - x1
  dy = cy - y1

  # Line direction vector
  line_dx = x2 - x1
  line_dy = y2 - y1
  line_len_sq = line_dx * line_dx + line_dy * line_dy

  return false if line_len_sq == 0

  # Project circle center onto line, clamped to segment
  t = ((dx * line_dx) + (dy * line_dy)) / line_len_sq
  t = [[t, 0.0].max, 1.0].min

  # Closest point on line segment
  closest_x = x1 + t * line_dx
  closest_y = y1 + t * line_dy

  # Distance from circle center to closest point
  dist_x = cx - closest_x
  dist_y = cy - closest_y
  dist_sq = dist_x * dist_x + dist_y * dist_y

  dist_sq < radius * radius
end

#linedef_blocks?(linedef, x, y) ⇒ Boolean 



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# File 'lib/doom/platform/gosu_window.rb', line 125

def linedef_blocks?(linedef, x, y)
  v1 = @map.vertices[linedef.v1]
  v2 = @map.vertices[linedef.v2]

  # Check if player circle intersects this line
  return false unless line_circle_intersect?(v1.x, v1.y, v2.x, v2.y, x, y, PLAYER_RADIUS)

  # One-sided linedef (wall) always blocks
  return true if linedef.sidedef_left == 0xFFFF

  # Two-sided: check if passable
  front_side = @map.sidedefs[linedef.sidedef_right]
  back_side = @map.sidedefs[linedef.sidedef_left]

  front_sector = @map.sectors[front_side.sector]
  back_sector = @map.sectors[back_side.sector]

  # Check step height
  step = back_sector.floor_height - front_sector.floor_height
  return true if step.abs > 24

  # Check ceiling clearance
  min_ceiling = [front_sector.ceiling_height, back_sector.ceiling_height].min
  max_floor = [front_sector.floor_height, back_sector.floor_height].max
  return true if min_ceiling - max_floor < 56  # Player height

  false
end

#needs_cursor? ⇒ Boolean 



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# File 'lib/doom/platform/gosu_window.rb', line 232

def needs_cursor?
  !@mouse_captured
end

#try_move(dx, dy) ⇒ Object 



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# File 'lib/doom/platform/gosu_window.rb', line 77

def try_move(dx, dy)
  new_x = @renderer.player_x + dx
  new_y = @renderer.player_y + dy

  # Check if new position is valid (simple collision detection)
  if valid_position?(new_x, new_y)
    @renderer.move_to(new_x, new_y)
    update_player_height(new_x, new_y)
  else
    # Try sliding along walls - try X movement only
    if valid_position?(new_x, @renderer.player_y)
      @renderer.move_to(new_x, @renderer.player_y)
      update_player_height(new_x, @renderer.player_y)
    # Try Y movement only
    elsif valid_position?(@renderer.player_x, new_y)
      @renderer.move_to(@renderer.player_x, new_y)
      update_player_height(@renderer.player_x, new_y)
    end
  end
end

#update ⇒ Object 



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# File 'lib/doom/platform/gosu_window.rb', line 31

def update
  handle_input
  @renderer.render_frame
end

#update_player_height(x, y) ⇒ Object 



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# File 'lib/doom/platform/gosu_window.rb', line 98

def update_player_height(x, y)
  sector = @map.sector_at(x, y)
  return unless sector

  # Player view height is 41 units above floor
  target_z = sector.floor_height + 41
  @renderer.set_z(target_z)
end

#valid_position?(x, y) ⇒ Boolean 



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# File 'lib/doom/platform/gosu_window.rb', line 107

def valid_position?(x, y)
  # Check if position is inside a valid sector
  sector = @map.sector_at(x, y)
  return false unless sector

  # Check floor height - can't walk into walls
  floor_height = sector.floor_height
  return false if floor_height > @renderer.player_z + 24  # Max step height

  # Check against blocking linedefs
  @map.linedefs.each do |linedef|
    next unless linedef_blocks?(linedef, x, y)
    return false
  end

  true
end