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

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

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

	native Actor Owner;						// Who owns this item? NULL if it's still a pickup.
	native int Amount;						// Amount of item this instance has
	native int MaxAmount;					// Max amount of item this 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;
	
	Default
	{
		Inventory.Amount 1;
		Inventory.MaxAmount 1;
		Inventory.InterHubAmount 1;
		Inventory.UseSound "misc/invuse";
		Inventory.PickupSound "misc/i_pkup";
		Inventory.PickupMessage "$TXT_DEFAULTPICKUPMSG";
	}
	
	virtual native bool Use (bool pickup);
	virtual native color GetBlend ();
	virtual native bool HandlePickup(Inventory item);
	virtual native Inventory CreateCopy(Actor other);
	virtual native Inventory CreateTossable();
	virtual native bool SpecialDropAction (Actor dropper);
	virtual native String PickupMessage();
	virtual native bool ShouldStay();
	virtual native void PlayPickupSound(Actor user);
	virtual native void AttachToOwner(Actor user);
	virtual native void DetachFromOwner();
	virtual native bool DrawPowerup(int x, int y);
	virtual native void AbsorbDamage (int damage, Name damageType, out int newdamage);
	
	native bool DoRespawn();
	native bool GoAway();
	native void GoAwayAndDie();
	native void BecomeItem();
	native void BecomePickup();
	
	// 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.
	virtual protected native bool TryPickup(in out Actor toucher);
	virtual protected native bool TryPickupRestricted(in out Actor toucher);
	native bool, Actor CallTryPickup(Actor toucher);

	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;
	}
	
	// These are regular functions for the item itself.
	
	//---------------------------------------------------------------------------
	//
	// 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 :: 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() {}
	
	virtual double GetSpeedFactor() { return 1; }
	virtual bool GetNoTeleportFreeze() { return false; }
	virtual void ModifyDamage(int damage, Name damageType, out int newdamage, bool passive) {}
	virtual void AlterWeaponSprite(VisStyle vis, in out int changed) {}
	virtual void OwnerDied() {}
	
}

class StateProvider : Inventory native
{
	action native state A_JumpIfNoAmmo(statelabel label);
	action native void A_CustomPunch(int damage, bool norandom = false, int flags = CPF_USEAMMO, class<Actor> pufftype = "BulletPuff", double range = 0, double lifesteal = 0, int lifestealmax = 0, class<BasicArmorBonus> armorbonustype = "ArmorBonus", sound MeleeSound = 0, sound MissSound = "");
	action native void A_FireBullets(double spread_xy, double spread_z, int numbullets, int damageperbullet, class<Actor> pufftype = "BulletPuff", int flags = 1, double range = 0, class<Actor> missile = null, double Spawnheight = 32, double Spawnofs_xy = 0);
	action native void A_FireProjectile(class<Actor> missiletype, double angle = 0, bool useammo = true, double spawnofs_xy = 0, double spawnheight = 0, int flags = 0, double pitch = 0);
	action native void A_RailAttack(int damage, int spawnofs_xy = 0, bool useammo = true, color color1 = 0, color color2 = 0, int flags = 0, double maxdiff = 0, class<Actor> pufftype = "BulletPuff", double spread_xy = 0, double spread_z = 0, double range = 0, int duration = 0, double sparsity = 1.0, double driftspeed = 1.0, class<Actor> spawnclass = "none", double spawnofs_z = 0, int spiraloffset = 270, int limit = 0);
	action native void A_WeaponReady(int flags = 0);
	action native void A_Lower();
	action native void A_Raise();

	action native void A_ReFire(statelabel flash = null);
	action native void A_ClearReFire();
	action native void A_CheckReload();
	action native void A_GunFlash(statelabel flash = null, int flags = 0);
	action native state A_CheckForReload(int counter, statelabel label, bool dontincrement = false);
	action native void A_ResetReloadCounter();
}

class DehackedPickup : Inventory native 
{
}

class FakeInventory : Inventory native 
{
	native bool Respawnable;
}

class CustomInventory : StateProvider native 
{
	Default
	{
		DefaultStateUsage SUF_ACTOR|SUF_OVERLAY|SUF_ITEM;
	}
}