1 files changed, 73 insertions, 0 deletions
diff --git a/patches/server/0975-Add-experience-points-API.patch b/patches/server/0975-Add-experience-points-API.patch
new file mode 100644
index 0000000000..5179a0626b
--- /dev/null
+++ b/patches/server/0975-Add-experience-points-API.patch
@@ -0,0 +1,73 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Lukas Planz <[email protected]>
+Date: Tue, 5 Sep 2023 20:34:20 +0200
+Subject: [PATCH] Add experience points 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 f32708ed934bbbf2416e32fdddc7bb4329958cf6..2a280a54bdd7e4b7f26e0b2d2da0d9d3fd432583 100644
+--- a/src/main/java/net/minecraft/world/entity/player/Player.java
++++ b/src/main/java/net/minecraft/world/entity/player/Player.java
+@@ -1826,7 +1826,7 @@ public abstract class Player extends LivingEntity {
+     }
+ 
+     public int getXpNeededForNextLevel() {
+-        return this.experienceLevel >= 30 ? 112 + (this.experienceLevel - 30) * 9 : (this.experienceLevel >= 15 ? 37 + (this.experienceLevel - 15) * 5 : 7 + this.experienceLevel * 2);
++        return this.experienceLevel >= 30 ? 112 + (this.experienceLevel - 30) * 9 : (this.experienceLevel >= 15 ? 37 + (this.experienceLevel - 15) * 5 : 7 + this.experienceLevel * 2); // Paper - diff on change; calculateTotalExperiencePoints
+     }
+     // Paper start - send while respecting visibility
+     private static void sendSoundEffect(Player fromEntity, double x, double y, double z, SoundEvent soundEffect, SoundSource soundCategory, float volume, float pitch) {
+diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+index b88c71c4a1d4eb5c24d143a0d8ddff507df690f7..205dfed388db7d022e4fd8b3f89485735d3320a8 100644
+--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
++++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftPlayer.java
+@@ -1824,6 +1824,49 @@ public class CraftPlayer extends CraftHumanEntity implements Player {
+         Preconditions.checkArgument(exp >= 0, "Total experience points must not be negative (%s)", exp);
+         this.getHandle().totalExperience = exp;
+     }
++    // Paper start
++    @Override
++    public int calculateTotalExperiencePoints() {
++        return calculateTotalExperiencePoints(this.getLevel()) + Math.round(this.getExperiencePointsNeededForNextLevel() * getExp());
++    }
++
++    @Override
++    public void setExperienceLevelAndProgress(final int totalExperience) {
++        Preconditions.checkArgument(totalExperience >= 0, "Total experience points must not be negative (%s)", totalExperience);
++        int level = calculateLevelsForExperiencePoints(totalExperience);
++        int remainingPoints = totalExperience - calculateTotalExperiencePoints(level);
++
++        this.getHandle().experienceLevel = level;
++        this.getHandle().experienceProgress = (float) remainingPoints / this.getExperiencePointsNeededForNextLevel();
++        this.getHandle().lastSentExp = -1;
++    }
++
++    @Override
++    public int getExperiencePointsNeededForNextLevel() {
++        return this.getHandle().getXpNeededForNextLevel();
++    }
++
++    // See https://minecraft.wiki/w/Experience#Leveling_up for reference
++    private int calculateTotalExperiencePoints(int level) {
++        if (level <= 16) {
++            return (int) (Math.pow(level, 2) + 6 * level);
++        } else if (level <= 31) {
++            return (int) (2.5 * Math.pow(level, 2) - 40.5 * level + 360.0);
++        } else {
++            return (int) (4.5 * Math.pow(level, 2) - 162.5 * level + 2220.0);
++        }
++    }
++
++    private int calculateLevelsForExperiencePoints(int points) {
++        if (points <= 352) { // Level 0-16
++            return (int) Math.floor(Math.sqrt(points + 9) - 3);
++        } else if (points <= 1507) { // Level 17-31
++            return (int) Math.floor(8.1 + Math.sqrt(0.4 * (points - (7839.0 / 40.0))));
++        } else { // 32+
++            return (int) Math.floor((325.0 / 18.0) + Math.sqrt((2.0 / 9.0) * (points - (54215.0 / 72.0))));
++        }
++    }
++    // Paper end
+ 
+     @Override
+     public void sendExperienceChange(float progress) {