From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Byteflux <byte@byteflux.net>
Date: Tue, 1 Mar 2016 14:14:15 -0600
Subject: [PATCH] Drop falling block and tnt entities at the specified height

* Dec 2, 2020 Added tnt nerf for tnt minecarts - Machine_Maker

diff --git a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
index f32726275d18772904883b618be66893ca5d84fd..b41f6074e0d88b6becb5b931fc4ee94a1f9f2f0b 100644
--- a/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
+++ b/src/main/java/com/destroystokyo/paper/PaperWorldConfig.java
@@ -180,4 +180,14 @@ public class PaperWorldConfig {
         keepSpawnInMemory = getBoolean("keep-spawn-loaded", true);
         log("Keep spawn chunk loaded: " + keepSpawnInMemory);
     }
+
+    public int fallingBlockHeightNerf;
+    public int entityTNTHeightNerf;
+    private void heightNerfs() {
+        fallingBlockHeightNerf = getInt("falling-block-height-nerf", 0);
+        entityTNTHeightNerf = getInt("tnt-entity-height-nerf", 0);
+
+        if (fallingBlockHeightNerf != 0) log("Falling Block Height Limit set to Y: " + fallingBlockHeightNerf);
+        if (entityTNTHeightNerf != 0) log("TNT Entity Height Limit set to Y: " + entityTNTHeightNerf);
+    }
 }
diff --git a/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java b/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
index 7e1594e8df4fd09cd1aecbc5f3784797b04a8337..26ab6d0c98560e4dfebbad3482fd308861818e30 100644
--- a/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
+++ b/src/main/java/net/minecraft/world/entity/item/FallingBlockEntity.java
@@ -137,6 +137,17 @@ public class FallingBlockEntity extends Entity {
             }
 
             this.move(MoverType.SELF, this.getDeltaMovement());
+
+            // Paper start - Configurable EntityFallingBlock height nerf
+            if (this.level.paperConfig.fallingBlockHeightNerf != 0 && this.getY() > this.level.paperConfig.fallingBlockHeightNerf) {
+                if (this.dropItem && this.level.getGameRules().getBoolean(GameRules.RULE_DOENTITYDROPS)) {
+                    this.spawnAtLocation(block);
+                }
+
+                this.discard();
+                return;
+            }
+            // Paper end
             if (!this.level.isClientSide) {
                 BlockPos blockposition = this.blockPosition();
                 boolean flag = this.blockState.getBlock() instanceof ConcretePowderBlock;
diff --git a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
index e24b46820394c5f220d5bf7c4e763ef95ff9e9ab..bbe15c66917781a8b6950307449f0243ffc3c8c7 100644
--- a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
+++ b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
@@ -68,6 +68,12 @@ public class PrimedTnt extends Entity {
         }
 
         this.move(MoverType.SELF, this.getDeltaMovement());
+        // Paper start - Configurable TNT entity height nerf
+        if (this.level.paperConfig.entityTNTHeightNerf != 0 && this.getY() > this.level.paperConfig.entityTNTHeightNerf) {
+            this.discard();
+            return;
+        }
+        // Paper end
         this.setDeltaMovement(this.getDeltaMovement().scale(0.98D));
         if (this.onGround) {
             this.setDeltaMovement(this.getDeltaMovement().multiply(0.7D, -0.5D, 0.7D));
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/MinecartTNT.java b/src/main/java/net/minecraft/world/entity/vehicle/MinecartTNT.java
index 3e64b1743042a293e2be9e1c16daa979b601e1ed..e430d9214d5abb367fa503e65af463f0e926563e 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/MinecartTNT.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/MinecartTNT.java
@@ -45,6 +45,12 @@ public class MinecartTNT extends AbstractMinecart {
     public void tick() {
         super.tick();
         if (this.fuse > 0) {
+            // Paper start - Configurable TNT entity height nerf
+            if (this.level.paperConfig.entityTNTHeightNerf != 0 && this.getY() > this.level.paperConfig.entityTNTHeightNerf) {
+                this.discard();
+                return;
+            }
+            // Paper end
             --this.fuse;
             this.level.addParticle(ParticleTypes.SMOKE, this.getX(), this.getY() + 0.5D, this.getZ(), 0.0D, 0.0D, 0.0D);
         } else if (this.fuse == 0) {