Corrosion (#306)

* Status move poisoning for Steel and Poison types.

* Can poison itself with Toxic Orb.

* Secondary effect poisoning now working.

* Created a function that checks if abilities can bypass type immunities.

* Created macro to handle typeimmunity

* Applied review changes.

* Applied review requests.

* Left more readable version of HOLD_EFFECT_TOXIC_ORB.

asm/macros/battle_script.inc

@@ -1713,6 +1713,12 @@
 	various \battler, VARIOUS_JUMP_IF_SHIELDS_DOWN_PROTECTED
 	.4byte \ptr
 	.endm
+
+	.macro trypoisontype attacker:req, target:req, ptr:req
+	various \attacker, VARIOUS_HANDLE_TYPE_IMMUNITY
+	.byte \target
+	.4byte \ptr
+	.endm
 	
 	.macro trysetfairylock ptr:req
 	various BS_ATTACKER, VARIOUS_TRY_FAIRY_LOCK

data/battle_scripts_1.s

@@ -2650,8 +2650,7 @@ BattleScript_EffectToxic::
 	jumpifsubstituteblocks BattleScript_ButItFailed
 	jumpifstatus BS_TARGET, STATUS1_POISON | STATUS1_TOXIC_POISON, BattleScript_AlreadyPoisoned
 	jumpifstatus BS_TARGET, STATUS1_ANY, BattleScript_ButItFailed
-	jumpiftype BS_TARGET, TYPE_POISON, BattleScript_NotAffected
+	trypoisontype BS_ATTACKER, BS_TARGET, BattleScript_NotAffected
-	jumpiftype BS_TARGET, TYPE_STEEL, BattleScript_NotAffected
 	accuracycheck BattleScript_ButItFailed, ACC_CURR_MOVE
 	jumpifsideaffecting BS_TARGET, SIDE_STATUS_SAFEGUARD, BattleScript_SafeguardProtected
 	attackanimation
@@ -2971,8 +2970,7 @@ BattleScript_EffectPoison::
 	jumpifsubstituteblocks BattleScript_ButItFailed
 	jumpifstatus BS_TARGET, STATUS1_POISON, BattleScript_AlreadyPoisoned
 	jumpifstatus BS_TARGET, STATUS1_TOXIC_POISON, BattleScript_AlreadyPoisoned
-	jumpiftype BS_TARGET, TYPE_POISON, BattleScript_NotAffected
+	trypoisontype BS_ATTACKER, BS_TARGET, BattleScript_NotAffected
-	jumpiftype BS_TARGET, TYPE_STEEL, BattleScript_NotAffected
 	jumpifstatus BS_TARGET, STATUS1_ANY, BattleScript_ButItFailed
 	accuracycheck BattleScript_ButItFailed, ACC_CURR_MOVE
 	jumpifsideaffecting BS_TARGET, SIDE_STATUS_SAFEGUARD, BattleScript_SafeguardProtected

include/battle_script_commands.h

@@ -17,6 +17,7 @@ void HandleBattleWindow(u8 xStart, u8 yStart, u8 xEnd, u8 yEnd, u8 flags);
 bool8 UproarWakeUpCheck(u8 battlerId);
 bool32 DoesSubstituteBlockMove(u8 battlerAtk, u8 battlerDef, u32 move);
 bool32 DoesDisguiseBlockMove(u8 battlerAtk, u8 battlerDef, u32 move);
+bool32 CanPoisonType(u8 battlerAttacker, u8 battlerTarget);
 bool32 CanUseLastResort(u8 battlerId);
 u32 IsFlowerVeilProtected(u32 battler);
 u32 IsLeafGuardProtected(u32 battler);

include/battle_scripts.h

@@ -1,6 +1,7 @@
 #ifndef GUARD_BATTLE_SCRIPTS_H
 #define GUARD_BATTLE_SCRIPTS_H
 
+extern const u8 BattleScript_NotAffected[];
 extern const u8 BattleScript_HitFromCritCalc[];
 extern const u8 BattleScript_MoveEnd[];
 extern const u8 BattleScript_MakeMoveMissed[];

include/constants/battle_script_commands.h

@@ -156,6 +156,7 @@
 #define VARIOUS_JUMP_IF_SHIELDS_DOWN_PROTECTED  93
 #define VARIOUS_TRY_FAIRY_LOCK                  94
 #define VARIOUS_JUMP_IF_NO_ALLY                 95
+#define VARIOUS_HANDLE_TYPE_IMMUNITY            96
 
 // Cmd_manipulatedamage
 #define DMG_CHANGE_SIGN            0

src/battle_script_commands.c

@@ -2254,7 +2254,7 @@ void SetMoveEffect(bool32 primary, u32 certain)
                 }
                 RESET_RETURN
             }
-            if ((IS_BATTLER_OF_TYPE(gEffectBattler, TYPE_POISON) || IS_BATTLER_OF_TYPE(gEffectBattler, TYPE_STEEL))
+            if (!CanPoisonType(gBattleScripting.battler, gEffectBattler)
                 && (gHitMarker & HITMARKER_IGNORE_SAFEGUARD)
                 && (primary == TRUE || certain == MOVE_EFFECT_CERTAIN))
             {
@@ -2264,9 +2264,7 @@ void SetMoveEffect(bool32 primary, u32 certain)
                 gBattleCommunication[MULTISTRING_CHOOSER] = 2;
                 RESET_RETURN
             }
-            if (IS_BATTLER_OF_TYPE(gEffectBattler, TYPE_POISON))
+            if (!CanPoisonType(gBattleScripting.battler, gEffectBattler))
-                break;
-            if (IS_BATTLER_OF_TYPE(gEffectBattler, TYPE_STEEL))
                 break;
             if (gBattleMons[gEffectBattler].status1)
                 break;
@@ -2401,7 +2399,7 @@ void SetMoveEffect(bool32 primary, u32 certain)
                 }
                 RESET_RETURN
             }
-            if ((IS_BATTLER_OF_TYPE(gEffectBattler, TYPE_POISON) || IS_BATTLER_OF_TYPE(gEffectBattler, TYPE_STEEL))
+            if (!CanPoisonType(gBattleScripting.battler, gEffectBattler)
                 && (gHitMarker & HITMARKER_IGNORE_SAFEGUARD)
                 && (primary == TRUE || certain == MOVE_EFFECT_CERTAIN))
             {
@@ -2413,7 +2411,7 @@ void SetMoveEffect(bool32 primary, u32 certain)
             }
             if (gBattleMons[gEffectBattler].status1)
                 break;
-            if (!IS_BATTLER_OF_TYPE(gEffectBattler, TYPE_POISON) && !IS_BATTLER_OF_TYPE(gEffectBattler, TYPE_STEEL))
+            if (CanPoisonType(gBattleScripting.battler, gEffectBattler))
             {
                 if (GetBattlerAbility(gEffectBattler) == ABILITY_IMMUNITY
                     || GetBattlerAbility(gEffectBattler) == ABILITY_COMATOSE
@@ -6672,6 +6670,13 @@ static void HandleTerrainMove(u32 moveEffect)
     }
 }
 
+bool32 CanPoisonType(u8 battlerAttacker, u8 battlerTarget)
+{
+    return (GetBattlerAbility(battlerAttacker) == ABILITY_CORROSION
+            || !(IS_BATTLER_OF_TYPE(battlerTarget, TYPE_POISON)
+                || IS_BATTLER_OF_TYPE(battlerTarget, TYPE_STEEL)));
+}
+
 bool32 CanUseLastResort(u8 battlerId)
 {
     u32 i;
@@ -6885,6 +6890,12 @@ static void Cmd_various(void)
         gBattleStruct->friskedBattler = 0;
         gBattleStruct->friskedAbility = FALSE;
         break;
+    case VARIOUS_HANDLE_TYPE_IMMUNITY:
+        if (!CanPoisonType(gActiveBattler, GetBattlerForBattleScript(gBattlescriptCurrInstr[3])))
+            gBattlescriptCurrInstr = T1_READ_PTR(gBattlescriptCurrInstr + 4);
+        else
+            gBattlescriptCurrInstr += 8;
+        return;
     case VARIOUS_TRACE_ABILITY:
         gBattleMons[gActiveBattler].ability = gBattleStruct->tracedAbility[gActiveBattler];
         RecordAbilityBattle(gActiveBattler, gBattleMons[gActiveBattler].ability);

src/battle_util.c

@@ -4865,7 +4865,7 @@ u8 ItemBattleEffects(u8 caseID, u8 battlerId, bool8 moveTurn)
         {
         case HOLD_EFFECT_TOXIC_ORB:
             if (!gBattleMons[battlerId].status1
-                && !IS_BATTLER_OF_TYPE(battlerId, TYPE_POISON) && !IS_BATTLER_OF_TYPE(battlerId, TYPE_STEEL)
+                && CanPoisonType(battlerId, battlerId)
                 && GetBattlerAbility(battlerId) != ABILITY_IMMUNITY)
             {
                 effect = ITEM_STATUS_CHANGE;