PaperMC/patches/unapplied/server/0671-Prevent-excessive-velocity-through-repeated-crits.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Nassim Jahnke <nassim@njahnke.dev>
Date: Thu, 25 Nov 2021 10:25:09 +0100
Subject: [PATCH] Prevent excessive velocity through repeated crits


diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 31eb77e4e5f07b120708edeca497ef2eef1fcf13..ed6fd20ff608e764d6b0f517f6c9c85c533f1646 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -2697,13 +2697,26 @@ public abstract class LivingEntity extends Entity implements Attackable {
         return this.hasEffect(MobEffects.JUMP) ? 0.1F * ((float) this.getEffect(MobEffects.JUMP).getAmplifier() + 1.0F) : 0.0F;
     }
 
+    protected long lastJumpTime = 0L; // Paper - Prevent excessive velocity through repeated crits
     protected void jumpFromGround() {
         Vec3 vec3d = this.getDeltaMovement();
+        // Paper start - Prevent excessive velocity through repeated crits
+        long time = System.nanoTime();
+        boolean canCrit = true;
+        if (this instanceof net.minecraft.world.entity.player.Player) {
+            canCrit = false;
+            if (time - this.lastJumpTime > (long)(0.250e9)) {
+                this.lastJumpTime = time;
+                canCrit = true;
+            }
+        }
+        // Paper end - Prevent excessive velocity through repeated crits
 
         this.setDeltaMovement(vec3d.x, (double) this.getJumpPower(), vec3d.z);
         if (this.isSprinting()) {
             float f = this.getYRot() * 0.017453292F;
 
+            if (canCrit) // Paper - Prevent excessive velocity through repeated crits
             this.setDeltaMovement(this.getDeltaMovement().add((double) (-Mth.sin(f) * 0.2F), 0.0D, (double) (Mth.cos(f) * 0.2F)));
         }