Class: Doom::Game::PlayerState

Inherits:
Object
  • Object
show all
Defined in:
lib/doom/game/player_state.rb

Overview

Tracks player state for HUD display and weapon rendering

Constant Summary collapse

WEAPON_FIST =

Weapons

0
WEAPON_PISTOL = 
1
WEAPON_SHOTGUN = 
2
WEAPON_CHAINGUN = 
3
WEAPON_ROCKET = 
4
WEAPON_PLASMA = 
5
WEAPON_BFG = 
6
WEAPON_CHAINSAW = 
7
WEAPON_NAMES =

Weapon symbols for graphics lookup

{
  WEAPON_FIST => :fist,
  WEAPON_PISTOL => :pistol,
  WEAPON_SHOTGUN => :shotgun,
  WEAPON_CHAINGUN => :chaingun,
  WEAPON_ROCKET => :rocket,
  WEAPON_PLASMA => :plasma,
  WEAPON_BFG => :bfg,
  WEAPON_CHAINSAW => :chainsaw
}.freeze
ATTACK_DURATIONS =

Attack durations in tics (at 35fps), matching DOOM’s weapon state sequences

{
  WEAPON_FIST => 14,       # Punch windup + swing
  WEAPON_PISTOL => 16,     # S_PISTOL: 6+4+5+1 tics
  WEAPON_SHOTGUN => 40,    # Pump action cycle
  WEAPON_CHAINGUN => 8,    # Rapid fire (2 shots per cycle)
  WEAPON_ROCKET => 20,     # Rocket launch + recovery
  WEAPON_PLASMA => 8,      # Fast energy weapon
  WEAPON_BFG => 60,        # Long charge + fire
  WEAPON_CHAINSAW => 6     # Fast melee
}.freeze
VIEWHEIGHT =

Smooth step-up/down (matching Chocolate Doom’s P_CalcHeight / P_ZMovement)

41.0
VIEWHEIGHT_HALF = 
VIEWHEIGHT / 2.0
DELTA_ACCEL =

deltaviewheight += FRACUNIT/4 per tic

0.25
MAXBOB =

View bob (camera bounce when walking, matching Chocolate Doom’s P_CalcHeight + P_XYMovement + P_Thrust from p_user.c / p_mobj.c)

16.0
STOPSPEED =

Maximum bob amplitude (0x100000 in fixed-point = 16 map units)

0.0625
BOB_DECAY_RATE =

Continuous-time equivalents of DOOM’s per-tic constants (35 fps tic rate):

FRICTION = 0xE800/0x10000 = 0.90625 per tic
decay_rate = -ln(0.90625) * 35 = 3.44/sec
walk thrust = forwardmove(25) * 2048 / 65536 = 0.78 map units/tic = 27.3/sec
terminal velocity = 27.3 / 3.44 = 7.56 -> bob = 7.56^2/4 = 14.3 (89% of MAXBOB)

3.44
BOB_THRUST =

Friction as continuous decay rate (1/sec)

26.0
BOB_FREQUENCY =

Walk thrust (map units/sec), gives terminal ~7.5

11.0
BOB_MOM_SCALE =

Compute view bob from actual movement momentum. Matches Chocolate Doom P_CalcHeight:

bob = (momx*momx + momy*momy) >> 2, capped at MAXBOB
viewz += finesine[angle] * bob/2

Momentum is in units/sec; DOOM’s bob uses units/tic (divide by 35).

1.0 / (35.0 * 35.0 * 4.0)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ PlayerState

Returns a new instance of PlayerState.



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# File 'lib/doom/game/player_state.rb', line 73

def initialize
  reset
end

Instance Attribute Details

#ammo_bullets ⇒ Object

Returns the value of attribute ammo_bullets.



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# File 'lib/doom/game/player_state.rb', line 42

def ammo_bullets
  @ammo_bullets
end

#ammo_cells ⇒ Object

Returns the value of attribute ammo_cells.



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# File 'lib/doom/game/player_state.rb', line 42

def ammo_cells
  @ammo_cells
end

#ammo_rockets ⇒ Object

Returns the value of attribute ammo_rockets.



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# File 'lib/doom/game/player_state.rb', line 42

def ammo_rockets
  @ammo_rockets
end

#ammo_shells ⇒ Object

Returns the value of attribute ammo_shells.



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# File 'lib/doom/game/player_state.rb', line 42

def ammo_shells
  @ammo_shells
end

#armor ⇒ Object

Returns the value of attribute armor.



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# File 'lib/doom/game/player_state.rb', line 41

def armor
  @armor
end

#attack_frame ⇒ Object

Returns the value of attribute attack_frame.



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# File 'lib/doom/game/player_state.rb', line 46

def attack_frame
  @attack_frame
end

#attack_tics ⇒ Object

Returns the value of attribute attack_tics.



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# File 'lib/doom/game/player_state.rb', line 46

def attack_tics
  @attack_tics
end

#attacking ⇒ Object

Returns the value of attribute attacking.



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# File 'lib/doom/game/player_state.rb', line 46

def attacking
  @attacking
end

#bob_amount ⇒ Object

Returns the value of attribute bob_amount.



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# File 'lib/doom/game/player_state.rb', line 47

def bob_amount
  @bob_amount
end

#bob_angle ⇒ Object

Returns the value of attribute bob_angle.



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# File 'lib/doom/game/player_state.rb', line 47

def bob_angle
  @bob_angle
end

#damage_count ⇒ Object

Red flash intensity (0-8), decays each tic



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# File 'lib/doom/game/player_state.rb', line 50

def damage_count
  @damage_count
end

#dead ⇒ Object

Returns the value of attribute dead.



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# File 'lib/doom/game/player_state.rb', line 49

def dead
  @dead
end

#death_tic ⇒ Object

Returns the value of attribute death_tic.



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# File 'lib/doom/game/player_state.rb', line 49

def death_tic
  @death_tic
end

#deltaviewheight ⇒ Object (readonly)

Returns the value of attribute deltaviewheight.



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# File 'lib/doom/game/player_state.rb', line 57

def deltaviewheight
  @deltaviewheight
end

#god_mode ⇒ Object

Returns the value of attribute god_mode.



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# File 'lib/doom/game/player_state.rb', line 51

def god_mode
  @god_mode
end

#has_weapons ⇒ Object

Returns the value of attribute has_weapons.



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# File 'lib/doom/game/player_state.rb', line 44

def has_weapons
  @has_weapons
end

#health ⇒ Object

Returns the value of attribute health.



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# File 'lib/doom/game/player_state.rb', line 41

def health
  @health
end

#infinite_ammo ⇒ Object

Returns the value of attribute infinite_ammo.



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# File 'lib/doom/game/player_state.rb', line 51

def infinite_ammo
  @infinite_ammo
end

#is_moving ⇒ Object

Returns the value of attribute is_moving.



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# File 'lib/doom/game/player_state.rb', line 48

def is_moving
  @is_moving
end

#keys ⇒ Object

Returns the value of attribute keys.



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# File 'lib/doom/game/player_state.rb', line 45

def keys
  @keys
end

#max_armor ⇒ Object

Returns the value of attribute max_armor.



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# File 'lib/doom/game/player_state.rb', line 41

def max_armor
  @max_armor
end

#max_bullets ⇒ Object

Returns the value of attribute max_bullets.



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# File 'lib/doom/game/player_state.rb', line 43

def max_bullets
  @max_bullets
end

#max_cells ⇒ Object

Returns the value of attribute max_cells.



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# File 'lib/doom/game/player_state.rb', line 43

def max_cells
  @max_cells
end

#max_health ⇒ Object

Returns the value of attribute max_health.



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# File 'lib/doom/game/player_state.rb', line 41

def max_health
  @max_health
end

#max_rockets ⇒ Object

Returns the value of attribute max_rockets.



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# File 'lib/doom/game/player_state.rb', line 43

def max_rockets
  @max_rockets
end

#max_shells ⇒ Object

Returns the value of attribute max_shells.



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# File 'lib/doom/game/player_state.rb', line 43

def max_shells
  @max_shells
end

#view_bob_offset ⇒ Object (readonly)

Bob cycle frequency (rad/sec): FINEANGLES/20 * 35 / 8192 * 2*PI



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# File 'lib/doom/game/player_state.rb', line 71

def view_bob_offset
  @view_bob_offset
end

#viewheight ⇒ Object (readonly)

Returns the value of attribute viewheight.



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# File 'lib/doom/game/player_state.rb', line 57

def viewheight
  @viewheight
end

#weapon ⇒ Object

Returns the value of attribute weapon.



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# File 'lib/doom/game/player_state.rb', line 44

def weapon
  @weapon
end

Instance Method Details

#can_attack? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/doom/game/player_state.rb', line 174

def can_attack?
  return true if @weapon == WEAPON_FIST || @weapon == WEAPON_CHAINSAW
  return true if @infinite_ammo

  ammo = current_ammo
  ammo && ammo > 0
end

#current_ammo ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 144

def current_ammo
  case @weapon
  when WEAPON_PISTOL, WEAPON_CHAINGUN
    @ammo_bullets
  when WEAPON_SHOTGUN
    @ammo_shells
  when WEAPON_ROCKET
    @ammo_rockets
  when WEAPON_PLASMA, WEAPON_BFG
    @ammo_cells
  else
    nil # Fist/chainsaw don't use ammo
  end
end

#die ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 357

def die
  @dead = true
  @death_tic = 0
  @attacking = false
  @deltaviewheight = -VIEWHEIGHT / 8.0  # View drops to ground
end

#health_level ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 308

def health_level
  # 0 = dying, 4 = full health
  case @health
  when 80..200 then 4
  when 60..79 then 3
  when 40..59 then 2
  when 20..39 then 1
  else 0
  end
end

#max_ammo_for_weapon ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 159

def max_ammo_for_weapon
  case @weapon
  when WEAPON_PISTOL, WEAPON_CHAINGUN
    @max_bullets
  when WEAPON_SHOTGUN
    @max_shells
  when WEAPON_ROCKET
    @max_rockets
  when WEAPON_PLASMA, WEAPON_BFG
    @max_cells
  else
    nil
  end
end

#notify_step(step_amount) ⇒ Object

Called when player moves onto a different floor height. Matches Chocolate Doom P_ZMovement: reduce viewheight by the step amount so the camera doesn’t snap, then let P_CalcHeight recover it smoothly.



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# File 'lib/doom/game/player_state.rb', line 243

def notify_step(step_amount)
  return if step_amount == 0
  @viewheight -= step_amount
  @deltaviewheight = (VIEWHEIGHT - @viewheight) / 8.0
end

#reset ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 77

def reset
  @health = 100
  @armor = 0
  @max_health = 100
  @max_armor = 200

  # Ammo
  @ammo_bullets = 50
  @ammo_shells = 0
  @ammo_rockets = 0
  @ammo_cells = 0

  @max_bullets = 200
  @max_shells = 50
  @max_rockets = 50
  @max_cells = 300

  # Start with fist and pistol
  @weapon = WEAPON_PISTOL
  @has_weapons = [true, true, false, false, false, false, false, false]

  # No keys
  @keys = {
    blue_card: false,
    yellow_card: false,
    red_card: false,
    blue_skull: false,
    yellow_skull: false,
    red_skull: false
  }

  # Attack state
  @attacking = false
  @attack_frame = 0
  @attack_tics = 0

  # Death state
  @dead = false
  @death_tic = 0
  @damage_count = 0

  # Cheats
  @god_mode = false
  @infinite_ammo = false

  # Weapon bob
  @bob_angle = 0.0
  @bob_amount = 0.0
  @is_moving = false

  # Smooth step height (P_CalcHeight viewheight/deltaviewheight)
  @viewheight = VIEWHEIGHT
  @deltaviewheight = 0.0

  # View bob (camera bounce) - simulated momentum for P_CalcHeight
  @view_bob_offset = 0.0
  @momx = 0.0        # Simulated X momentum (map units/sec, not actual movement)
  @momy = 0.0        # Simulated Y momentum
  @thrust_x = 0.0    # Per-frame thrust input (raw, before normalization)
  @thrust_y = 0.0
  @view_bob_angle = 0.0
end

#set_movement_momentum(momx, momy) ⇒ Object

Set movement momentum directly (called from GosuWindow with actual movement momentum, which already has thrust + friction applied).



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# File 'lib/doom/game/player_state.rb', line 274

def set_movement_momentum(momx, momy)
  @momx = momx
  @momy = momy
end

#start_attack ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 182

def start_attack
  return unless can_attack?
  return if @attacking

  @attacking = true
  @attack_frame = 0
  @attack_tics = 0

  # Consume ammo (skipped with infinite ammo)
  return if @infinite_ammo

  case @weapon
  when WEAPON_PISTOL
    @ammo_bullets -= 1 if @ammo_bullets > 0
  when WEAPON_SHOTGUN
    @ammo_shells -= 1 if @ammo_shells > 0
  when WEAPON_CHAINGUN
    @ammo_bullets -= 1 if @ammo_bullets > 0
  when WEAPON_ROCKET
    @ammo_rockets -= 1 if @ammo_rockets > 0
  when WEAPON_PLASMA
    @ammo_cells -= 1 if @ammo_cells > 0
  when WEAPON_BFG
    @ammo_cells -= 40 if @ammo_cells >= 40
  end
end

#switch_weapon(weapon_num) ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 319

def switch_weapon(weapon_num)
  return unless weapon_num >= 0 && weapon_num < 8
  return unless @has_weapons[weapon_num]
  return if @attacking

  @weapon = weapon_num
end

#take_damage(amount) ⇒ Object

Apply damage (from environment or enemies). Armor absorbs some.



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# File 'lib/doom/game/player_state.rb', line 328

def take_damage(amount)
  return if @dead
  return if @god_mode

  absorbed = 0
  if @armor > 0
    absorbed = amount / 3  # Green armor absorbs 1/3
    absorbed = @armor if absorbed > @armor
    @armor -= absorbed
  end

  actual = amount - absorbed
  @health -= actual

  # Red flash proportional to damage (capped at palette 8)
  @damage_count = [(@damage_count + actual / 2.0).ceil, 8].min

  if @health <= 0
    @health = 0
    @damage_count = 8
    die
  end
end

#update_attack ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 209

def update_attack
  return unless @attacking

  @attack_tics += 1

  # Calculate which frame we're on based on tics
  duration = ATTACK_DURATIONS[@weapon] || 8
  frame_count = @weapon == WEAPON_FIST ? 3 : 4

  tics_per_frame = duration / frame_count
  @attack_frame = (@attack_tics / tics_per_frame).to_i

  # Attack finished?
  if @attack_tics >= duration
    @attacking = false
    @attack_frame = 0
    @attack_tics = 0
  end
end

#update_bob(delta_time) ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 229

def update_bob(delta_time)
  if @is_moving
    # Increase bob while moving
    @bob_angle += delta_time * 10.0
    @bob_amount = [@bob_amount + delta_time * 16.0, 6.0].min
  else
    # Decay bob when stopped
    @bob_amount = [@bob_amount - delta_time * 12.0, 0.0].max
  end
end

#update_damage_count ⇒ Object

Decay damage flash each tic



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# File 'lib/doom/game/player_state.rb', line 353

def update_damage_count
  @damage_count -= 1 if @damage_count > 0
end

#update_view_bob(delta_time) ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 286

def update_view_bob(delta_time)
  dt = delta_time.clamp(0.001, 0.05)

  # P_CalcHeight: bob = (momx_per_tic^2 + momy_per_tic^2) / 4, capped at MAXBOB
  bob = (@momx * @momx + @momy * @momy) * BOB_MOM_SCALE
  bob = MAXBOB if bob > MAXBOB

  # Advance bob sine wave (FINEANGLES/20 per tic = ~11 rad/sec)
  @view_bob_angle += BOB_FREQUENCY * dt

  # viewz offset: sin(angle) * bob/2
  @view_bob_offset = Math.sin(@view_bob_angle) * bob / 2.0
end

#update_viewheight ⇒ Object

Gradually restore viewheight to VIEWHEIGHT (called each tic). Matches Chocolate Doom P_CalcHeight viewheight recovery loop. For step-up: viewheight < 41, delta > 0, accelerates upward. For step-down: viewheight > 41, delta < 0, decelerates then recovers.



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# File 'lib/doom/game/player_state.rb', line 253

def update_viewheight
  @viewheight += @deltaviewheight

  if @viewheight > VIEWHEIGHT && @deltaviewheight >= 0
    @viewheight = VIEWHEIGHT
    @deltaviewheight = 0.0
  end

  if @viewheight < VIEWHEIGHT_HALF
    @viewheight = VIEWHEIGHT_HALF
    @deltaviewheight = 1.0 if @deltaviewheight <= 0
  end

  if @deltaviewheight != 0
    @deltaviewheight += DELTA_ACCEL
    @deltaviewheight = 0.0 if @deltaviewheight.abs < 0.01 && (@viewheight - VIEWHEIGHT).abs < 0.5
  end
end

#weapon_bob_x ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 300

def weapon_bob_x
  Math.cos(@bob_angle) * @bob_amount
end

#weapon_bob_y ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 304

def weapon_bob_y
  Math.sin(@bob_angle * 2) * @bob_amount * 0.5
end

#weapon_name ⇒ Object 



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# File 'lib/doom/game/player_state.rb', line 140

def weapon_name
  WEAPON_NAMES[@weapon]
end