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Paper/patches/server/0481-Inline-shift-direction-fields.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Mon, 18 Jan 2021 20:45:25 -0500
Subject: [PATCH] Inline shift direction fields
Removes a layer of indirection for EnumDirection.getAdjacent(X|Y|Z)(), which is in the
critical section for much of the server, including the lighting engine.
diff --git a/src/main/java/net/minecraft/core/Direction.java b/src/main/java/net/minecraft/core/Direction.java
index 69ccada8ea78c05d3fb886222698c07dee421506..3fde5abde736b2c19d8819d9aec0397a0245ccd1 100644
--- a/src/main/java/net/minecraft/core/Direction.java
+++ b/src/main/java/net/minecraft/core/Direction.java
@@ -57,6 +57,12 @@ public enum Direction implements StringRepresentable {
.sorted(Comparator.comparingInt(direction -> direction.data2d))
.toArray(Direction[]::new);
+ // Paper start - Perf: Inline shift direction fields
+ private final int adjX;
+ private final int adjY;
+ private final int adjZ;
+ // Paper end - Perf: Inline shift direction fields
+
private Direction(
final int id,
final int idOpposite,
@@ -74,6 +80,11 @@ public enum Direction implements StringRepresentable {
this.axisDirection = direction;
this.normal = vector;
this.normalVec3 = Vec3.atLowerCornerOf(vector);
+ // Paper start - Perf: Inline shift direction fields
+ this.adjX = vector.getX();
+ this.adjY = vector.getY();
+ this.adjZ = vector.getZ();
+ // Paper end - Perf: Inline shift direction fields
}
public static Direction[] orderedByNearest(Entity entity) {
@@ -247,15 +258,15 @@ public enum Direction implements StringRepresentable {
}
public int getStepX() {
- return this.normal.getX();
+ return this.adjX; // Paper - Perf: Inline shift direction fields
}
public int getStepY() {
- return this.normal.getY();
+ return this.adjY; // Paper - Perf: Inline shift direction fields
}
public int getStepZ() {
- return this.normal.getZ();
+ return this.adjZ; // Paper - Perf: Inline shift direction fields
}
public Vector3f step() {