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Paper/patches/server/0075-Optimize-isInWorldBounds-and-getBlockState-for-inlin.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, 3 Mar 2016 02:07:55 -0600
Subject: [PATCH] Optimize isInWorldBounds and getBlockState for inlining
Hot methods, so reduce # of instructions for the method.
Move is valid location test to the BlockPosition class so that it can access local variables.
Replace all calls to the new place to the unnecessary forward.
Optimize getType and getBlockData to manually inline and optimize the calls
diff --git a/src/main/java/net/minecraft/core/Vec3i.java b/src/main/java/net/minecraft/core/Vec3i.java
index 4587a3668b6be9222cdd74a38229f89f611d1af6..9f32861d791f7e4cb39d2ad01f48e1916fc2b4b1 100644
--- a/src/main/java/net/minecraft/core/Vec3i.java
+++ b/src/main/java/net/minecraft/core/Vec3i.java
@@ -33,6 +33,12 @@ public class Vec3i implements Comparable<Vec3i> {
return CODEC.flatXmap(checkOffsetAxes(maxAbsValue), checkOffsetAxes(maxAbsValue));
}
+ // Paper start
+ public final boolean isInsideBuildHeightAndWorldBoundsHorizontal(net.minecraft.world.level.LevelHeightAccessor levelHeightAccessor) {
+ return getX() >= -30000000 && getZ() >= -30000000 && getX() < 30000000 && getZ() < 30000000 && !levelHeightAccessor.isOutsideBuildHeight(getY());
+ }
+ // Paper end
+
public Vec3i(int x, int y, int z) {
this.x = x;
this.y = y;
diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 62c54a0c789ca460ec29b0c653f5abd113736fb9..d612b59e04fcd01a8e2c4c7f43d8735fc208b520 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -276,7 +276,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {
}
public boolean isInWorldBounds(BlockPos pos) {
- return !this.isOutsideBuildHeight(pos) && Level.isInWorldBoundsHorizontal(pos);
+ return pos.isInsideBuildHeightAndWorldBoundsHorizontal(this); // Paper - use better/optimized check
}
public static boolean isInSpawnableBounds(BlockPos pos) {
diff --git a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
index 0e787d877901dfcea714b0e14e9fc4358ee30bbe..41e61e6c128f22224665af3f07cd11d69a43062b 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ChunkAccess.java
@@ -160,6 +160,7 @@ public abstract class ChunkAccess implements BlockGetter, BiomeManager.NoiseBiom
return GameEventDispatcher.NOOP;
}
+ public abstract BlockState getBlockState(final int x, final int y, final int z); // Paper
@Nullable
public abstract BlockState setBlockState(BlockPos pos, BlockState state, boolean moved);
diff --git a/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
index a78bf00d4559dd99869d93ec78b3525d24331925..b7856c420f346ac4923afa66a9f8276490f27e82 100644
--- a/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/EmptyLevelChunk.java
@@ -55,6 +55,12 @@ public class EmptyLevelChunk extends LevelChunk {
public void setBlockEmptinessMap(final boolean[] emptinessMap) {}
// Paper end - starlight
+ // Paper start
+ @Override
+ public BlockState getBlockState(int x, int y, int z) {
+ return Blocks.VOID_AIR.defaultBlockState();
+ }
+ // Paper end
@Override
public BlockState getBlockState(BlockPos pos) {
return Blocks.VOID_AIR.defaultBlockState();
diff --git a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
index ac5dff35e2df23b8790bbe65c40acc6a3c77e6ac..8ffc206a858864d277ff94de7c66ffdb07d8f491 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ImposterProtoChunk.java
@@ -89,6 +89,12 @@ public class ImposterProtoChunk extends ProtoChunk {
public BlockState getBlockState(BlockPos pos) {
return this.wrapped.getBlockState(pos);
}
+ // Paper start
+ @Override
+ public final BlockState getBlockState(final int x, final int y, final int z) {
+ return this.wrapped.getBlockStateFinal(x, y, z);
+ }
+ // Paper end
@Override
public FluidState getFluidState(BlockPos pos) {
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
index 20c9eada6f051ecdd5e45e625d7e6289d406a2f8..5244a0a85d80963493d9106dd2674b1701c1919c 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunk.java
@@ -342,12 +342,29 @@ public class LevelChunk extends ChunkAccess {
}
}
+ // Paper start - Optimize getBlockData to reduce instructions
@Override
public BlockState getBlockState(BlockPos pos) {
- int i = pos.getX();
- int j = pos.getY();
- int k = pos.getZ();
+ return this.getBlockStateFinal(pos.getX(), pos.getY(), pos.getZ());
+ }
+
+ @Override
+ public BlockState getBlockState(final int x, final int y, final int z) {
+ return this.getBlockStateFinal(x, y, z);
+ }
+ public final BlockState getBlockStateFinal(final int x, final int y, final int z) {
+ // Method body / logic copied from below
+ final int i = this.getSectionIndex(y);
+ if (i < 0 || i >= this.sections.length || this.sections[i].nonEmptyBlockCount == 0 || this.sections[i].hasOnlyAir()) {
+ return Blocks.AIR.defaultBlockState();
+ }
+ // Inlined ChunkSection.getType() and DataPaletteBlock.a(int,int,int)
+ return this.sections[i].states.get((y & 15) << 8 | (z & 15) << 4 | x & 15);
+ }
+
+ public BlockState getBlockState_unused(int i, int j, int k) {
+ // Paper end
if (this.level.isDebug()) {
BlockState iblockdata = null;
diff --git a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
index dddae1e226d8f58cdcfc597e25d4228cd3245cb4..ae37e97e52557b48f129cc02eeea395378a48444 100644
--- a/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
+++ b/src/main/java/net/minecraft/world/level/chunk/LevelChunkSection.java
@@ -21,7 +21,7 @@ public class LevelChunkSection {
public static final int SECTION_SIZE = 4096;
public static final int BIOME_CONTAINER_BITS = 2;
private final int bottomBlockY;
- private short nonEmptyBlockCount;
+ short nonEmptyBlockCount; // Paper - package-private
private short tickingBlockCount;
private short tickingFluidCount;
public final PalettedContainer<BlockState> states;
diff --git a/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java b/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
index 040c6092ceed4c693a7a056c0d1a49d3d2242b19..13b62e8e6569c154547bc0d5626488c5b0839f20 100644
--- a/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
+++ b/src/main/java/net/minecraft/world/level/chunk/ProtoChunk.java
@@ -94,14 +94,18 @@ public class ProtoChunk extends ChunkAccess {
@Override
public BlockState getBlockState(BlockPos pos) {
- int i = pos.getY();
- if (this.isOutsideBuildHeight(i)) {
+ // Paper start
+ return getBlockState(pos.getX(), pos.getY(), pos.getZ());
+ }
+ public BlockState getBlockState(final int x, final int y, final int z) {
+ if (this.isOutsideBuildHeight(y)) {
return Blocks.VOID_AIR.defaultBlockState();
} else {
- LevelChunkSection levelChunkSection = this.getSection(this.getSectionIndex(i));
- return levelChunkSection.hasOnlyAir() ? Blocks.AIR.defaultBlockState() : levelChunkSection.getBlockState(pos.getX() & 15, i & 15, pos.getZ() & 15);
+ LevelChunkSection levelChunkSection = this.getSections()[this.getSectionIndex(y)];
+ return levelChunkSection.hasOnlyAir() ? Blocks.AIR.defaultBlockState() : levelChunkSection.getBlockState(x & 15, y & 15, z & 15);
}
}
+ // Paper end
@Override
public FluidState getFluidState(BlockPos pos) {
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