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Paper-Old/patches/server/0282-Use-Vanilla-Minecart-Speeds.patch
Spottedleaf 01a13871de
Rewrite chunk system (#8177)
Patch documentation to come

Issues with the old system that are fixed now:
- World generation does not scale with cpu cores effectively.
- Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps.
- Unreliable prioritisation of chunk gen/load calls that block the main thread.
- Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved.
- Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal.
- Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles.

The above list is not complete. The patch documentation will complete it.

New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil.

Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft.

The old legacy chunk system patches have been moved to the removed folder in case we need them again.
2022-09-26 01:02:51 -07:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 8 Nov 2018 21:33:09 -0500
Subject: [PATCH] Use Vanilla Minecart Speeds
CraftBukkit changed the values on flying speed, restore back to vanilla
diff --git a/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java b/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
index a21bd9753ee9e86b33a66925c05e8494196729be..7d60f56b2e8206e8e546abdd06ea74a2ead6e75d 100644
--- a/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
+++ b/src/main/java/net/minecraft/world/entity/vehicle/AbstractMinecart.java
@@ -103,9 +103,9 @@ public abstract class AbstractMinecart extends Entity {
private double derailedX = 0.5;
private double derailedY = 0.5;
private double derailedZ = 0.5;
- private double flyingX = 0.95;
- private double flyingY = 0.95;
- private double flyingZ = 0.95;
+ private double flyingX = 0.949999988079071D; // Paper - restore vanilla precision
+ private double flyingY = 0.949999988079071D; // Paper - restore vanilla precision
+ private double flyingZ = 0.949999988079071D; // Paper - restore vanilla precision
public double maxSpeed = 0.4D;
// CraftBukkit end