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[Spells] Update to SPA 378 SE_SpellEffectResistChance (#4845)

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* SPA 378 update

Update to SPA 378

SE_SpellEffectResistChance provides chance to resist specific spell effects.

This updates allows support for multiple resistance checks against different effects in same spell.

Example. If a spell has a silence and a blind effect and the target has an AA that gives 10% chance to resist silence and 5% chance to resist blind. It will roll against effect respectively each giving a chance to resist the spell.

* Update spells.cpp

Unresistable spells (resisttype = 0) do not ever resist a spell even with SPA378

Example: Pheonix Charm in Plane of Fire, or Storm Comet in Bastion of Thunder. Parsed both and never got a resist despite having the AA that has effect specific resists which both those spells match.
This commit is contained in:
KayenEQ
2025-04-09 22:23:39 -04:00
committed by GitHub
parent 5522eda6e4
commit 8e2961dda5
4 changed files with 37 additions and 17 deletions
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zone/spell_effects.cpp
+27 -14
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@@ -7465,44 +7465,57 @@ void Mob::DispelMagic(Mob* caster, uint16 spell_id, int effect_value)
}
}
uint16 Mob::GetSpellEffectResistChance(uint16 spell_id)
bool Mob::TrySpellEffectResist(uint16 spell_id)
{
/*
SEResist variable
0 = spell effect id to be check if can resist
1 = percent chance of resistance
*/
if(!IsValidSpell(spell_id))
return 0;
if (!aabonuses.SEResist[1] && !spellbonuses.SEResist[1] && !itembonuses.SEResist[1])
return 0;
if (!IsValidSpell(spell_id)) {
return false;
}
uint16 resist_chance = 0;
if (!aabonuses.SEResist[1] && !spellbonuses.SEResist[1] && !itembonuses.SEResist[1]) {
return false;
}
int resist_chance = 0;
for(int i = 0; i < EFFECT_COUNT; ++i)
{
bool found = false;
if (spells[spell_id].effect_id[i] == SE_Blank) {
continue;
}
for(int d = 0; d < MAX_RESISTABLE_EFFECTS*2; d+=2)
{
resist_chance = 0;
if (spells[spell_id].effect_id[i] == aabonuses.SEResist[d]){
resist_chance += aabonuses.SEResist[d+1];
found = true;
}
if (spells[spell_id].effect_id[i] == itembonuses.SEResist[d]){
resist_chance += itembonuses.SEResist[d+1];
found = true;
}
if (spells[spell_id].effect_id[i] == spellbonuses.SEResist[d]){
resist_chance += spellbonuses.SEResist[d+1];
found = true;
}
if (found)
continue;
if (resist_chance) {
if (zone->random.Roll(resist_chance)) {
LogSpells("Resisted spell from Spell Effect Resistance, had [{}] chance to resist spell effect id [{}]", resist_chance, spells[spell_id].effect_id[i]);
return true;
}
break;
}
}
}
return resist_chance;
return false;
}
bool Mob::TryDispel(uint8 caster_level, uint8 buff_level, int level_modifier){