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anti_magic.dm
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/// This provides different types of magic resistance on an object
/datum/component/anti_magic
/// A bitflag with the types of magic resistance on the object
var/antimagic_flags
/// The amount of times the object can protect the user from magic
/// Set to INFINITY to have, well, infinite charges.
var/charges
/// The inventory slot the object must be located at in order to activate
var/inventory_flags
/// The callback invoked when we have been drained a antimagic charge
var/datum/callback/drain_antimagic
/// The callback invoked when twe have been depleted of all charges
var/datum/callback/expiration
/// Whether we should, on equipping, alert the caster that this item can block any of their spells
/// This changes between true and false on equip and drop, don't set it outright to something
var/alert_caster_on_equip = TRUE
/**
* Adds magic resistances to an object
*
* Magic resistance will prevent magic from affecting the user if it has the correct resistance
* against the type of magic being used
*
* args:
* * antimagic_flags (optional) A bitflag with the types of magic resistance on the object
* * charges (optional) The amount of times the object can protect the user from magic
* * inventory_flags (optional) The inventory slot the object must be located at in order to activate
* * drain_antimagic (optional) The proc that is triggered when an object has been drained a antimagic charge
* * expiration (optional) The proc that is triggered when the object is depleted of charges
* *
* antimagic bitflags: (see code/__DEFINES/magic.dm)
* * MAGIC_RESISTANCE - Default magic resistance that blocks normal magic (wizard, spells, staffs)
* * MAGIC_RESISTANCE_MIND - Tinfoil hat magic resistance that blocks mental magic (telepathy, abductors, jelly people)
* * MAGIC_RESISTANCE_HOLY - Holy magic resistance that blocks unholy magic (revenant, cult, vampire, voice of god)
**/
/datum/component/anti_magic/Initialize(
antimagic_flags = MAGIC_RESISTANCE,
charges = INFINITY,
inventory_flags = ~ITEM_SLOT_BACKPACK, // items in a backpack won't activate, anywhere else is fine
datum/callback/drain_antimagic,
datum/callback/expiration,
)
if(isitem(parent))
RegisterSignal(parent, COMSIG_ITEM_EQUIPPED, PROC_REF(on_equip))
RegisterSignal(parent, COMSIG_ITEM_DROPPED, PROC_REF(on_drop))
else if(ismob(parent))
register_antimagic_signals(parent)
else
return COMPONENT_INCOMPATIBLE
src.antimagic_flags = antimagic_flags
src.charges = charges
src.inventory_flags = inventory_flags
src.drain_antimagic = drain_antimagic
src.expiration = expiration
/datum/component/anti_magic/Destroy(force, silent)
drain_antimagic = null
expiration = null
return ..()
/datum/component/anti_magic/proc/register_antimagic_signals(datum/on_what)
RegisterSignal(on_what, COMSIG_MOB_RECEIVE_MAGIC, PROC_REF(block_receiving_magic), override = TRUE)
RegisterSignal(on_what, COMSIG_MOB_RESTRICT_MAGIC, PROC_REF(restrict_casting_magic), override = TRUE)
/datum/component/anti_magic/proc/unregister_antimagic_signals(datum/on_what)
UnregisterSignal(on_what, list(COMSIG_MOB_RECEIVE_MAGIC, COMSIG_MOB_RESTRICT_MAGIC))
/datum/component/anti_magic/proc/on_equip(atom/movable/source, mob/equipper, slot)
SIGNAL_HANDLER
if(!(inventory_flags & slot)) //Check that the slot is valid for antimagic
unregister_antimagic_signals(equipper)
return
register_antimagic_signals(equipper)
if(!alert_caster_on_equip)
return
// Check to see if we have any spells that are blocked due to antimagic
for(var/datum/action/cooldown/spell/magic_spell in equipper.actions)
if(!(magic_spell.spell_requirements & SPELL_REQUIRES_NO_ANTIMAGIC))
continue
if(!(antimagic_flags & magic_spell.antimagic_flags))
continue
to_chat(equipper, span_warning("[parent] is interfering with your ability to cast magic!"))
alert_caster_on_equip = FALSE
break
/datum/component/anti_magic/proc/on_drop(atom/movable/source, mob/user)
SIGNAL_HANDLER
// Reset alert
if(source.loc != user)
alert_caster_on_equip = TRUE
unregister_antimagic_signals(user)
/datum/component/anti_magic/proc/block_receiving_magic(mob/living/carbon/source, casted_magic_flags, charge_cost, list/antimagic_sources)
SIGNAL_HANDLER
// We do not block this type of magic, good day
if(!(casted_magic_flags & antimagic_flags))
return NONE
// We have already blocked this spell
if(parent in antimagic_sources)
return NONE
// Block success! Add this parent to the list of antimagic sources
antimagic_sources += parent
if((charges != INFINITY) && charge_cost > 0)
drain_antimagic?.Invoke(source, parent)
charges -= charge_cost
if(charges <= 0)
expiration?.Invoke(source, parent)
qdel(src) // no more antimagic
return COMPONENT_MAGIC_BLOCKED
/// cannot cast magic with the same type of antimagic present
/datum/component/anti_magic/proc/restrict_casting_magic(mob/user, magic_flags)
SIGNAL_HANDLER
if(magic_flags & antimagic_flags)
if(HAS_TRAIT(user, TRAIT_ANTIMAGIC_NO_SELFBLOCK)) // this trait bypasses magic casting restrictions
return NONE
return COMPONENT_MAGIC_BLOCKED
return NONE