gzdoom/wadsrc/static/zscript/inventory/inventory.txt

struct VisStyle
{
	bool			Invert;
	float			Alpha;
	int				RenderStyle;
}

class Inventory : Actor native
{
	const BLINKTHRESHOLD = (4*32);
	const BONUSADD = 6;

	native Actor Owner;						// Who owns self item? NULL if it's still a pickup.
	native int Amount;						// Amount of item self instance has
	native int MaxAmount;					// Max amount of item self instance can have
	native int InterHubAmount;				// Amount of item that can be kept between hubs or levels
	native int RespawnTics;					// Tics from pickup time to respawn time
	native TextureID Icon;					// Icon to show on status bar or HUD
	native int DropTime;					// Countdown after dropping
	native Class<Actor> SpawnPointClass;	// For respawning like Heretic's mace
	native Class<Actor> PickupFlash;		// actor to spawn as pickup flash
	native Sound PickupSound;
	native bool bPickupGood;
	native bool bCreateCopyMoved;
	native bool bInitEffectFailed;
	native meta String PickupMsg;
	native meta int GiveQuest;
	
	Default
	{
		Inventory.Amount 1;
		Inventory.MaxAmount 1;
		Inventory.InterHubAmount 1;
		Inventory.UseSound "misc/invuse";
		Inventory.PickupSound "misc/i_pkup";
		Inventory.PickupMessage "$TXT_DEFAULTPICKUPMSG";
	}
	
	native bool CanPickup(Actor toucher);
	native bool DoRespawn();
	native void BecomeItem();
	native void BecomePickup();
	native void ModifyDropAmount(int dropamount);
	native static void PrintPickupMessage (bool localview, String str);

	States(Actor, Overlay, Weapon, Item)
	{
	HideDoomish:
		TNT1 A 1050;
		TNT1 A 0 A_RestoreSpecialPosition;
		TNT1 A 1 A_RestoreSpecialDoomThing;
		Stop;
	HideSpecial:
		ACLO E 1400;
		ACLO A 0 A_RestoreSpecialPosition;
		ACLO A 4 A_RestoreSpecialThing1;
		ACLO BABCBCDC 4;
		ACLO D 4 A_RestoreSpecialThing2;
		Stop;
	Held:
		TNT1 A -1;
		Stop;
	HoldAndDestroy:
		TNT1 A 1;
		Stop;
	}
	

	//===========================================================================
	//
	// AInventory :: BeginPlay
	//
	//===========================================================================

	override void BeginPlay ()
	{
		Super.BeginPlay ();
		bDropped = true;	// [RH] Items are dropped by default
	}

	//---------------------------------------------------------------------------
	//
	// PROC A_RestoreSpecialThing1
	//
	// Make a special thing visible again.
	//
	//---------------------------------------------------------------------------

	void A_RestoreSpecialThing1()
	{
		bInvisible = false;
		if (DoRespawn ())
		{
			A_PlaySound ("misc/spawn", CHAN_VOICE);
		}
	}

	//---------------------------------------------------------------------------
	//
	// PROC A_RestoreSpecialThing2
	//
	//---------------------------------------------------------------------------

	void A_RestoreSpecialThing2()
	{
		bSpecial = true;
		if (!Default.bNoGravity)
		{
			bNoGravity = false;
		}
		SetState (SpawnState);
	}

	//---------------------------------------------------------------------------
	//
	// PROC A_RestoreSpecialDoomThing
	//
	//---------------------------------------------------------------------------

	void A_RestoreSpecialDoomThing()
	{
		bInvisible = false;
		bSpecial = true;
		if (!Default.bNoGravity)
		{
			bNoGravity = false;
		}
		if (DoRespawn ())
		{
			SetState (SpawnState);
			A_PlaySound ("misc/spawn", CHAN_VOICE);
			Spawn ("ItemFog", Pos, ALLOW_REPLACE);
		}
	}
		

	//===========================================================================
	//
	// AInventory :: CreateCopy
	//
	// Returns an actor suitable for placing in an inventory, either itself or
	// a copy based on whether it needs to respawn or not. Returning NULL
	// indicates the item should not be picked up.
	//
	//===========================================================================

	virtual Inventory CreateCopy (Actor other)
	{
		Inventory copy;

		Amount = MIN(Amount, MaxAmount);
		if (GoAway ())
		{
			copy = Inventory(Spawn (GetClass()));
			copy.Amount = Amount;
			copy.MaxAmount = MaxAmount;
		}
		else
		{
			copy = self;
		}
		return copy;
	}

	//===========================================================================
	//
	// AInventory :: HandlePickup
	//
	// Returns true if the pickup was handled (or should not happen at all),
	// false if not.
	//
	//===========================================================================

	virtual bool HandlePickup (Inventory item)
	{
		if (item.GetClass() == GetClass())
		{
			if (Amount < MaxAmount || (sv_unlimited_pickup && !item.ShouldStay()))
			{
				if (Amount > 0 && Amount + item.Amount < 0)
				{
					Amount = 0x7fffffff;
				}
				else
				{
					Amount += item.Amount;
				}
			
				if (Amount > MaxAmount && !sv_unlimited_pickup)
				{
					Amount = MaxAmount;
				}
				item.bPickupGood = true;
			}
			return true;
		}
		return false;
	}

	//===========================================================================
	//
	// AInventory :: CallHandlePickup
	//
	// Runs all HandlePickup methods in the chain
	//
	//===========================================================================

	private bool CallHandlePickup(Inventory item)
	{
		let me = self;
		while (me != null)
		{
			if (me.HandlePickup(item)) return true;
			me = me.Inv;
		}
		return false;
	}
		
	//===========================================================================
	//
	// AInventory :: TryPickup
	//
	//===========================================================================

	virtual protected bool TryPickup (in out Actor toucher)
	{
		Actor newtoucher = toucher; // in case changed by the powerup

		// If HandlePickup() returns true, it will set the IF_PICKUPGOOD flag
		// to indicate that self item has been picked up. If the item cannot be
		// picked up, then it leaves the flag cleared.

		bPickupGood = false;
		if (toucher.Inv != NULL && toucher.Inv.CallHandlePickup (self))
		{
			// Let something else the player is holding intercept the pickup.
			if (!bPickupGood)
			{
				return false;
			}
			bPickupGood = false;
			GoAwayAndDie ();
		}
		else if (MaxAmount > 0)
		{
			// Add the item to the inventory. It is not already there, or HandlePickup
			// would have already taken care of it.
			let copy = CreateCopy (toucher);
			if (copy == NULL)
			{
				return false;
			}
			// Some powerups cannot activate absolutely, for
			// example, PowerMorph; fail the pickup if so.
			if (copy.bInitEffectFailed)
			{
				if (copy != self) copy.Destroy();
				else bInitEffectFailed;
				return false;
			}
			// Handle owner-changing powerups
			if (copy.bCreateCopyMoved)
			{
				newtoucher = copy.Owner;
				copy.Owner = NULL;
				bCreateCopyMoved = false;
			}
			// Continue onwards with the rest
			copy.AttachToOwner (newtoucher);
			if (bAutoActivate)
			{
				if (copy.Use (true))
				{
					if (--copy.Amount <= 0)
					{
						copy.bSpecial = false;
						copy.SetStateLabel ("HoldAndDestroy");
					}
				}
			}
		}
		else if (bAutoActivate)
		{
			// Special case: If an item's MaxAmount is 0, you can still pick it
			// up if it is autoactivate-able.

			// The item is placed in the inventory just long enough to be used.
			toucher.AddInventory(self);
			bool usegood = Use(true);
			toucher.RemoveInventory(self);

			if (usegood)
			{
				GoAwayAndDie();
			}
			else
			{
				return false;
			}
		}
		return true;
	}

	//===========================================================================
	//
	// AInventory :: GiveQuest
	//
	//===========================================================================

	void GiveQuestItem (Actor toucher)
	{
		if (GiveQuest > 0)
		{
			String qname = "QuestItem" .. GiveQuest;
			class<Inventory> type = qname;
			if (type != null)
			{
				toucher.GiveInventoryType (type);
			}
		}
	}

	//===========================================================================
	//
	// AInventory :: CallTryPickup
	//
	// In this case the caller function is more than a simple wrapper around the virtual method and
	// is what must be actually called to pick up an item.
	//
	//===========================================================================

	bool, Actor CallTryPickup(Actor toucher)
	{
		let saved_toucher = toucher;
		let Invstack = Inv; // A pointer of the inventories item stack.

		// unmorphed versions of a currently morphed actor cannot pick up anything. 
		if (bUnmorphed) return false, null;

		bool res;
		if (CanPickup(toucher))
		{
			res = TryPickup(toucher);
		}
		else if (!bRestrictAbsolutely)
		{
			// let an item decide for itself how it will handle this
			res = TryPickupRestricted(toucher);
		}
		else
			return false, null;


		if (!res && (bAlwaysPickup) && !ShouldStay())
		{
			res = true;
			GoAwayAndDie();
		}

		if (res)
		{
			GiveQuestItem(toucher);

			// Transfer all inventory across that the old object had, if requested.
			if (bTransfer)
			{
				while (Invstack)
				{
					let titem = Invstack;
					Invstack = titem.Inv;
					if (titem.Owner == self)
					{
						if (!titem.CallTryPickup(toucher)) // The object no longer can exist
						{
							titem.Destroy();
						}
					}
				}
			}
		}
		return res, toucher;
	}
	
	//===========================================================================
	//
	// AInventory :: ShouldStay
	//
	// Returns true if the item should not disappear, even temporarily.
	//
	//===========================================================================

	virtual bool ShouldStay ()
	{
		return false;
	}

	//===========================================================================
	//
	// AInventory :: TryPickupRestricted
	//
	//===========================================================================

	virtual bool TryPickupRestricted (in out Actor toucher)
	{
		return false;
	}

	//===========================================================================
	//
	// AInventory :: AttachToOwner
	//
	//===========================================================================

	virtual void AttachToOwner (Actor other)
	{
		BecomeItem ();
		other.AddInventory (self);
	}

	//===========================================================================
	//
	// AInventory :: DetachFromOwner
	//
	// Performs any special work needed when the item leaves an inventory,
	// either through destruction or becoming a pickup.
	//
	//===========================================================================

	virtual void DetachFromOwner ()
	{
	}

	//===========================================================================
	//
	// AInventory::CreateTossable
	//
	// Creates a copy of the item suitable for dropping. If this actor embodies
	// only one item, then it is tossed out itself. Otherwise, the count drops
	// by one and a new item with an amount of 1 is spawned.
	//
	//===========================================================================

	virtual Inventory CreateTossable ()
	{
		// If self actor lacks a SpawnState, don't drop it. (e.g. A base weapon
		// like the fist can't be dropped because you'll never see it.)
		if (SpawnState == GetDefaultByType("Actor").SpawnState || SpawnState == NULL)
		{
			return NULL;
		}
		if (bUndroppable || bUntossable || Owner == NULL || Amount <= 0)
		{
			return NULL;
		}
		if (Amount == 1 && !bKeepDepleted)
		{
			BecomePickup ();
			DropTime = 30;
			bSpecial = bSolid = false;
			return self;
		}
		let copy = Inventory(Spawn (GetClass(), Owner.Pos, NO_REPLACE));
		if (copy != NULL)
		{
			copy.MaxAmount = MaxAmount;
			copy.Amount = 1;
			copy.DropTime = 30;
			copy.bSpecial = copy.bSolid = false;
			Amount--;
		}
		return copy;
	}

	
	//===========================================================================
	//
	// AInventory :: PickupMessage
	//
	// Returns the message to print when this actor is picked up.
	//
	//===========================================================================

	virtual String PickupMessage ()
	{
		return PickupMsg;
	}
	
	//===========================================================================
	//
	// AInventory :: Touch
	//
	// Handles collisions from another actor, possible adding itself to the
	// collider's inventory.
	//
	//===========================================================================

	override void Touch (Actor toucher)
	{
		let player = toucher.player;

		// If a voodoo doll touches something, pretend the real player touched it instead.
		if (player != NULL)
		{
			toucher = player.mo;
		}

		bool localview = toucher.CheckLocalView(consoleplayer);

		bool res;
		[res, toucher] = CallTryPickup(toucher);
		if (!res) return;

		// This is the only situation when a pickup flash should ever play.
		if (PickupFlash != NULL && !ShouldStay())
		{
			Spawn(PickupFlash, Pos, ALLOW_REPLACE);
		}

		if (!bQuiet)
		{
			PrintPickupMessage(localview, PickupMessage ());

			// Special check so voodoo dolls picking up items cause the
			// real player to make noise.
			if (player != NULL)
			{
				PlayPickupSound (player.mo);
				if (!bNoScreenFlash)
				{
					player.bonuscount = BONUSADD;
				}
			}
			else
			{
				PlayPickupSound (toucher);
			}
		}							

		// [RH] Execute an attached special (if any)
		DoPickupSpecial (toucher);

		if (bCountItem)
		{
			if (player != NULL)
			{
				player.itemcount++;
			}
			level.found_items++;
		}

		if (bCountSecret)
		{
			Actor ac = player != NULL? Actor(player.mo) : toucher;
			ac.GiveSecret(true, true);
		}

		//Added by MC: Check if item taken was the roam destination of any bot
		for (int i = 0; i < MAXPLAYERS; i++)
		{
			if (players[i].Bot != NULL && self == players[i].Bot.dest)
				players[i].Bot.dest = NULL;
		}
	}

	//===========================================================================
	//
	// AInventory :: DepleteOrDestroy
	//
	// If the item is depleted, just change its amount to 0, otherwise it's destroyed.
	//
	//===========================================================================

	virtual void DepleteOrDestroy ()
	{
		// If it's not ammo or an internal armor, destroy it.
		// Ammo needs to stick around, even when it's zero for the benefit
		// of the weapons that use it and to maintain the maximum ammo
		// amounts a backpack might have given.
		// Armor shouldn't be removed because they only work properly when
		// they are the last items in the inventory.
		if (bKeepDepleted)
		{
			Amount = 0;
		}
		else
		{
			Destroy();
		}
	}

	//===========================================================================
	//
	// AInventory :: Travelled
	//
	// Called when an item in somebody's inventory is carried over to another
	// map, in case it needs to do special reinitialization.
	//
	//===========================================================================

	virtual void Travelled() {}

	//===========================================================================
	//
	// AInventory :: DoEffect
	//
	// Handles any effect an item might apply to its owner
	// Normally only used by subclasses of Powerup
	//
	//===========================================================================

	virtual void DoEffect() {}
	
	//===========================================================================
	//
	// AInventory :: Hide
	//
	// Hides this actor until it's time to respawn again. 
	//
	//===========================================================================

	virtual void Hide ()
	{
		State HideSpecialState = NULL, HideDoomishState = NULL;

		bSpecial = false;
		bNoGravity = true;
		bInvisible = true;

		if (gameinfo.gametype & GAME_Raven)
		{
			HideSpecialState = FindState("HideSpecial");
			if (HideSpecialState == NULL)
			{
				HideDoomishState = FindState("HideDoomish");
			}
		}
		else
		{
			HideDoomishState = FindState("HideDoomish");
			if (HideDoomishState == NULL)
			{
				HideSpecialState = FindState("HideSpecial");
			}
		}

		if (HideSpecialState != NULL)
		{
			SetState (HideSpecialState);
			tics = 1400;
			if (PickupFlash != NULL) tics += 30;
		}
		else if (HideDoomishState != NULL)
		{
			SetState (HideDoomishState);
			tics = 1050;
		}
		if (RespawnTics != 0)
		{
			tics = RespawnTics;
		}
	}


	
	//===========================================================================
	//
	// AInventory :: ShouldRespawn
	//
	// Returns true if the item should hide itself and reappear later when picked
	// up.
	//
	//===========================================================================

	virtual bool ShouldRespawn ()
	{
		if (bBigPowerup && !sv_respawnsuper) return false;
		if (bNeverRespawn) return false;
		return sv_itemrespawn || bAlwaysRespawn;
	}

	//===========================================================================
	//
	// AInventory :: GoAway
	//
	// Returns true if you must create a copy of this item to give to the player
	// or false if you can use this one instead.
	//
	//===========================================================================

	protected bool GoAway ()
	{
		// Dropped items never stick around
		if (bDropped)
		{
			return false;
		}

		if (!ShouldStay ())
		{
			Hide ();
			if (ShouldRespawn ())
			{
				return true;
			}
			return false;
		}
		return true;
	}
	
	//===========================================================================
	//
	// AInventory :: GoAwayAndDie
	//
	// Like GoAway but used by items that don't insert themselves into the
	// inventory. If they won't be respawning, then they can destroy themselves.
	//
	//===========================================================================

	protected void GoAwayAndDie ()
	{
		if (!GoAway ())
		{
			bSpecial = false;
			SetStateLabel("HoldAndDestroy");
		}
	}
	
	//===========================================================================
	//
	// AInventory :: ModifyDamage
	//
	// Allows inventory items to manipulate the amount of damage
	// inflicted. Damage is the amount of damage that would be done without manipulation,
	// and newdamage is the amount that should be done after the item has changed
	// it.
	// 'active' means it is called by the inflictor, 'passive' by the target.
	// It may seem that this is redundant and AbsorbDamage is the same. However,
	// AbsorbDamage is called only for players and also depends on other settings
	// which are undesirable for a protection artifact.
	//
	//===========================================================================

	virtual void ModifyDamage(int damage, Name damageType, out int newdamage, bool passive) {}
	

	virtual bool Use (bool pickup) { return false; }
	virtual double GetSpeedFactor() { return 1; }
	virtual bool GetNoTeleportFreeze() { return false; }
	virtual void AlterWeaponSprite(VisStyle vis, in out int changed) {}
	virtual void OwnerDied() {}
	virtual Color GetBlend () { return 0; }

	//===========================================================================
	//
	// AInventory :: DoPickupSpecial
	//
	// Executes this actor's special when it is picked up.
	//
	//===========================================================================

	virtual void DoPickupSpecial (Actor toucher)
	{
		if (special)
		{
			toucher.A_CallSpecial(special, args[0], args[1], args[2], args[3], args[4]);
			special = 0;
		}
	}
		//===========================================================================
	//
	// AInventory :: PlayPickupSound
	//
	//===========================================================================

	virtual void PlayPickupSound (Actor toucher)
	{
		double atten;
		int chan;

		if (bNoAttenPickupSound)
		{
			atten = ATTN_NONE;
		}
		/*
		else if ((ItemFlags & IF_FANCYPICKUPSOUND) &&
			(toucher == NULL || toucher->CheckLocalView(consoeplayer)))
		{
			atten = ATTN_NONE;
		}
		*/
		else
		{
			atten = ATTN_NORM;
		}

		if (toucher != NULL && toucher.CheckLocalView(consoleplayer))
		{
			chan = CHAN_PICKUP|CHAN_NOPAUSE;
		}
		else
		{
			chan = CHAN_PICKUP;
		}
		toucher.A_PlaySound(PickupSound, chan, 1, false, atten);
	}

	//===========================================================================
	//
	// AInventory :: DrawPowerup
	//
	// Gives self item a chance to draw a special status indicator on the screen.
	// Returns false if it didn't draw anything.
	//
	//===========================================================================

	virtual bool DrawPowerup(int x, int y) { return false; }

	//===========================================================================
	//
	// AInventory :: AbsorbDamage
	//
	// Allows inventory items (primarily armor) to reduce the amount of damage
	// taken. Damage is the amount of damage that would be done without armor,
	// and newdamage is the amount that should be done after the armor absorbs
	// it.
	//
	//===========================================================================

	virtual void AbsorbDamage (int damage, Name damageType, out int newdamage) {}
	
	//===========================================================================
	//
	// AInventory :: SpecialDropAction
	//
	// Called by P_DropItem. Return true to prevent the standard drop tossing.
	// A few Strife items that are meant to trigger actions rather than be
	// picked up use this. Normal items shouldn't need it.
	//
	//===========================================================================

	virtual bool SpecialDropAction (Actor dropper)
	{
		return false;
	}

	
}

//===========================================================================
//
// 
//
//===========================================================================

class DehackedPickup : Inventory
{
	Inventory RealPickup;
	bool droppedbymonster;
	
	private native class<Inventory> DetermineType();
	
	override bool TryPickup (in out Actor toucher)
	{
		let type = DetermineType ();
		if (type == NULL)
		{
			return false;
		}
		RealPickup = Inventory(Spawn (type, Pos, NO_REPLACE));
		if (RealPickup != NULL)
		{
			// The internally spawned item should never count towards statistics.
			RealPickup.ClearCounters();
			if (!bDropped)
			{
				RealPickup.bDropped = false;
			}
			// If this item has been dropped by a monster the
			// amount of ammo this gives must be adjusted.
			if (droppedbymonster)
			{
				RealPickup.ModifyDropAmount(0);
			}
			if (!RealPickup.CallTryPickup (toucher))
			{
				RealPickup.Destroy ();
				RealPickup = NULL;
				return false;
			}
			GoAwayAndDie ();
			return true;
		}
		return false;
	}

	override String PickupMessage ()
	{
		if (RealPickup != null)
			return RealPickup.PickupMessage ();
		else return "";
	}

	override bool ShouldStay ()
	{
		if (RealPickup != null)
			return RealPickup.ShouldStay ();
		else return true;
	}

	override bool ShouldRespawn ()
	{
		if (RealPickup != null)
			return RealPickup.ShouldRespawn ();
		else return false;
	}

	override void PlayPickupSound (Actor toucher)
	{
		if (RealPickup != null)
			RealPickup.PlayPickupSound (toucher);
	}

	override void DoPickupSpecial (Actor toucher)
	{
		Super.DoPickupSpecial (toucher);
		// If the real pickup hasn't joined the toucher's inventory, make sure it
		// doesn't stick around.
		if (RealPickup != null && RealPickup.Owner != toucher)
		{
			RealPickup.Destroy ();
		}
		RealPickup = null;
	}

	override void OnDestroy ()
	{
		if (RealPickup != null)
		{
			RealPickup.Destroy ();
			RealPickup = null;
		}
		Super.OnDestroy();
	}
}

//===========================================================================
//
// 
//
//===========================================================================

class FakeInventory : Inventory
{
	bool Respawnable;
	
	property respawns: Respawnable;

	override bool ShouldRespawn ()
	{
		return Respawnable && Super.ShouldRespawn();
	}

	override bool TryPickup (in out Actor toucher)
	{
		let success = toucher.A_CallSpecial(special, args[0], args[1], args[2], args[3], args[4]);

		if (success)
		{
			GoAwayAndDie ();
			return true;
		}
		return false;
	}

	override void DoPickupSpecial (Actor toucher)
	{
		// The special was already executed by TryPickup, so do nothing here
	}
	
}