Paper/patches/server/0647-Add-critical-damage-API.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: dodison <kacpik@mapik.eu>
Date: Mon, 26 Jul 2021 17:32:36 +0200
Subject: [PATCH] Add critical damage API


diff --git a/src/main/java/net/minecraft/world/damagesource/DamageSource.java b/src/main/java/net/minecraft/world/damagesource/DamageSource.java
index df8c88bfa749e02f633350446101dcce05db7ac1..ed1277fad60992344b94f8a939febaca3edd9702 100644
--- a/src/main/java/net/minecraft/world/damagesource/DamageSource.java
+++ b/src/main/java/net/minecraft/world/damagesource/DamageSource.java
@@ -191,4 +191,18 @@ public class DamageSource {
     public Holder<DamageType> typeHolder() {
         return this.type;
     }
+
+    // Paper start - add critical damage API
+    private boolean critical;
+    public boolean isCritical() {
+        return this.critical;
+    }
+    public DamageSource critical() {
+        return this.critical(true);
+    }
+    public DamageSource critical(boolean critical) {
+        this.critical = critical;
+        return this;
+    }
+    // Paper end - add critical damage API
 }
diff --git a/src/main/java/net/minecraft/world/entity/player/Player.java b/src/main/java/net/minecraft/world/entity/player/Player.java
index 04b698ab61ab8cd7e6ee7159294e473e1608f2fd..85b616bf136535bac40693545cf68a768f4e343d 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -1263,7 +1263,7 @@ public abstract class Player extends LivingEntity {
                         flag1 = true;
                     }
 
-                    boolean flag2 = flag && this.fallDistance > 0.0F && !this.onGround() && !this.onClimbable() && !this.isInWater() && !this.hasEffect(MobEffects.BLINDNESS) && !this.isPassenger() && target instanceof LivingEntity;
+                    boolean flag2 = flag && this.fallDistance > 0.0F && !this.onGround() && !this.onClimbable() && !this.isInWater() && !this.hasEffect(MobEffects.BLINDNESS) && !this.isPassenger() && target instanceof LivingEntity; // Paper - Add critical damage API; diff on change
 
                     flag2 = flag2 && !this.level().paperConfig().entities.behavior.disablePlayerCrits; // Paper - Toggleable player crits
                     flag2 = flag2 && !this.isSprinting();
@@ -1303,7 +1303,7 @@ public abstract class Player extends LivingEntity {
                     }
 
                     Vec3 vec3d = target.getDeltaMovement();
-                    boolean flag5 = target.hurt(this.damageSources().playerAttack(this), f);
+                    boolean flag5 = target.hurt(this.damageSources().playerAttack(this).critical(flag2), f); // Paper - add critical damage API
 
                     if (flag5) {
                         if (i > 0) {
@@ -1331,7 +1331,7 @@ public abstract class Player extends LivingEntity {
 
                                 if (entityliving != this && entityliving != target && !this.isAlliedTo((Entity) entityliving) && (!(entityliving instanceof ArmorStand) || !((ArmorStand) entityliving).isMarker()) && this.distanceToSqr((Entity) entityliving) < 9.0D) {
                                     // CraftBukkit start - Only apply knockback if the damage hits
-                                    if (entityliving.hurt(this.damageSources().playerAttack(this).sweep(), f4)) {
+                                    if (entityliving.hurt(this.damageSources().playerAttack(this).sweep().critical(flag2), f4)) { // Paper - add critical damage API
                                     entityliving.knockback(0.4000000059604645D, (double) Mth.sin(this.getYRot() * 0.017453292F), (double) (-Mth.cos(this.getYRot() * 0.017453292F)), this); // Paper - Add EntityKnockbackByEntityEvent and EntityPushedByEntityAttackEvent
                                     }
                                     // CraftBukkit end
diff --git a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
index 004c130fc03dc01ef75fabdb4ef1ef711e33cb95..ae4319c2532855315bc45995a39d7eb98961b939 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/AbstractArrow.java
@@ -379,6 +379,7 @@ public abstract class AbstractArrow extends Projectile {
             }
         }
 
+        if (this.isCritArrow()) damagesource = damagesource.critical(); // Paper - add critical damage API
         boolean flag = entity.getType() == EntityType.ENDERMAN;
         int k = entity.getRemainingFireTicks();
         boolean flag1 = entity.getType().is(EntityTypeTags.DEFLECTS_ARROWS);
diff --git a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
index 166035d8f708b94a9563c3802418ab6200071bc6..25133298b26523bd36300ab03e216200c915386b 100644
--- a/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
+++ b/src/main/java/org/bukkit/craftbukkit/event/CraftEventFactory.java
@@ -1043,7 +1043,7 @@ public class CraftEventFactory {
                 } else {
                     damageCause = DamageCause.ENTITY_EXPLOSION;
                 }
-                event = new EntityDamageByEntityEvent(damager.getBukkitEntity(), entity.getBukkitEntity(), damageCause, modifiers, modifierFunctions);
+                event = new EntityDamageByEntityEvent(damager.getBukkitEntity(), entity.getBukkitEntity(), damageCause, modifiers, modifierFunctions, source.isCritical()); // Paper - add critical damage API
             }
             event.setCancelled(cancelled);
 
@@ -1075,7 +1075,7 @@ public class CraftEventFactory {
                 cause = DamageCause.SONIC_BOOM;
             }
 
-            return CraftEventFactory.callEntityDamageEvent(damager, entity, cause, modifiers, modifierFunctions, cancelled);
+            return CraftEventFactory.callEntityDamageEvent(damager, entity, cause, modifiers, modifierFunctions, cancelled, source.isCritical()); // Paper - add critical damage API
         } else if (source.is(DamageTypes.FELL_OUT_OF_WORLD)) {
             EntityDamageEvent event = new EntityDamageByBlockEvent(null, entity.getBukkitEntity(), DamageCause.VOID, modifiers, modifierFunctions);
             event.setCancelled(cancelled);
@@ -1145,7 +1145,7 @@ public class CraftEventFactory {
             } else {
                 throw new IllegalStateException(String.format("Unhandled damage of %s by %s from %s", entity, damager.getHandle(), source.getMsgId()));
             }
-            EntityDamageEvent event = new EntityDamageByEntityEvent(damager, entity.getBukkitEntity(), cause, modifiers, modifierFunctions);
+            EntityDamageEvent event = new EntityDamageByEntityEvent(damager, entity.getBukkitEntity(), cause, modifiers, modifierFunctions, source.isCritical()); // Paper - add critical damage API
             event.setCancelled(cancelled);
             CraftEventFactory.callEvent(event);
             if (!event.isCancelled()) {
@@ -1194,20 +1194,28 @@ public class CraftEventFactory {
         }
 
         if (cause != null) {
-            return CraftEventFactory.callEntityDamageEvent(null, entity, cause, modifiers, modifierFunctions, cancelled);
+            return CraftEventFactory.callEntityDamageEvent(null, entity, cause, modifiers, modifierFunctions, cancelled, source.isCritical()); // Paper - add critical damage API
         }
 
         throw new IllegalStateException(String.format("Unhandled damage of %s from %s", entity, source.getMsgId()));
     }
 
+    @Deprecated // Paper - Add critical damage API
     private static EntityDamageEvent callEntityDamageEvent(Entity damager, Entity damagee, DamageCause cause, Map<DamageModifier, Double> modifiers, Map<DamageModifier, Function<? super Double, Double>> modifierFunctions) {
         return CraftEventFactory.callEntityDamageEvent(damager, damagee, cause, modifiers, modifierFunctions, false);
     }
 
+    // Paper start - Add critical damage API
+    @Deprecated
     private static EntityDamageEvent callEntityDamageEvent(Entity damager, Entity damagee, DamageCause cause, Map<DamageModifier, Double> modifiers, Map<DamageModifier, Function<? super Double, Double>> modifierFunctions, boolean cancelled) {
+        return CraftEventFactory.callEntityDamageEvent(damager, damagee, cause, modifiers, modifierFunctions, false, false);
+    }
+
+    private static EntityDamageEvent callEntityDamageEvent(Entity damager, Entity damagee, DamageCause cause, Map<DamageModifier, Double> modifiers, Map<DamageModifier, Function<? super Double, Double>> modifierFunctions, boolean cancelled, boolean critical) {
+        // Paper end
         EntityDamageEvent event;
         if (damager != null) {
-            event = new EntityDamageByEntityEvent(damager.getBukkitEntity(), damagee.getBukkitEntity(), cause, modifiers, modifierFunctions);
+            event = new EntityDamageByEntityEvent(damager.getBukkitEntity(), damagee.getBukkitEntity(), cause, modifiers, modifierFunctions, critical); // Paper - add critical damage API
         } else {
             event = new EntityDamageEvent(damagee.getBukkitEntity(), cause, modifiers, modifierFunctions);
         }