mirror of
https://github.com/YatopiaMC/Yatopia.git
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197 lines
9.0 KiB
Diff
197 lines
9.0 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: 2No2Name <50278648+2No2Name@users.noreply.github.com>
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Date: Mon, 15 Feb 2021 14:58:55 -0500
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Subject: [PATCH] lithium: optimize `BlockPos.iterateOutwards` by caching
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offsets
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Code taken from: https://github.com/CaffeineMC/lithium-fabric/pull/123 by 2No2Name licenced under the LGPLv3 License
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diff --git a/src/main/java/me/jellysquid/mods/lithium/common/cached_blockpos_iteration/IterateOutwardsCache.java b/src/main/java/me/jellysquid/mods/lithium/common/cached_blockpos_iteration/IterateOutwardsCache.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..50e9df6056f713b2f1eaf0cb4a23875e0c6c2e2c
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--- /dev/null
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+++ b/src/main/java/me/jellysquid/mods/lithium/common/cached_blockpos_iteration/IterateOutwardsCache.java
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@@ -0,0 +1,72 @@
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+package me.jellysquid.mods.lithium.common.cached_blockpos_iteration;
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+
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+import it.unimi.dsi.fastutil.longs.LongArrayList;
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+import it.unimi.dsi.fastutil.longs.LongList;
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+import net.minecraft.core.BlockPosition;
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+
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+import java.util.Iterator;
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+import java.util.Random;
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+import java.util.concurrent.ConcurrentHashMap;
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+
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+/**
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+ * @author 2No2Name, original implemenation by SuperCoder7979 and Gegy1000
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+ */
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+public class IterateOutwardsCache {
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+ //POS_ZERO must not be replaced with BlockPos.ORIGIN, otherwise iterateOutwards at BlockPos.ORIGIN will not use the cache
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+ public static final BlockPosition POS_ZERO = new BlockPosition(0,0,0);
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+
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+
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+ private final ConcurrentHashMap<Long, LongArrayList> table;
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+ private final int capacity;
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+ private final Random random;
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+
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+ public IterateOutwardsCache(int capacity) {
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+ this.capacity = capacity;
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+ this.table = new ConcurrentHashMap<>(31);
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+ this.random = new Random();
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+ }
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+
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+ private void fillPositionsWithIterateOutwards(LongList entry, int xRange, int yRange, int zRange) {
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+ // Add all positions to the cached list
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+ for (BlockPosition pos : BlockPosition.iterateOutwards(POS_ZERO, xRange, yRange, zRange)) {
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+ entry.add(pos.asLong());
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+ }
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+ }
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+
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+ public LongList getOrCompute(int xRange, int yRange, int zRange) {
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+ long key = BlockPosition.asLong(xRange, yRange, zRange);
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+
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+ LongArrayList entry = this.table.get(key);
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+ if (entry != null) {
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+ return entry;
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+ }
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+
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+ // Cache miss: compute and store
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+ entry = new LongArrayList(128);
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+
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+ this.fillPositionsWithIterateOutwards(entry, xRange, yRange, zRange);
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+
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+ //decrease the array size, as of now it won't be modified anymore anyways
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+ entry.trim();
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+
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+ //this might overwrite an entry as the same entry could have been computed and added during this thread's computation
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+ //we do not use computeIfAbsent, as it can delay other threads for too long
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+ Object previousEntry = this.table.put(key, entry);
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+
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+
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+ if (previousEntry == null && this.table.size() > this.capacity) {
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+ //prevent a memory leak by randomly removing about 1/8th of the elements when the exceed the desired capacity is exceeded
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+ final Iterator<Long> iterator = this.table.keySet().iterator();
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+ //prevent an unlikely infinite loop caused by another thread filling the table concurrently using counting
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+ for (int i = -this.capacity; iterator.hasNext() && i < 5; i++) {
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+ Long key2 = iterator.next();
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+ //random is not threadsafe, but it doesn't matter here, because we don't need quality random numbers
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+ if (this.random.nextInt(8) == 0 && key2 != key) {
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+ iterator.remove();
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+ }
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+ }
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+ }
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+
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+ return entry;
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+ }
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+}
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\ No newline at end of file
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diff --git a/src/main/java/me/jellysquid/mods/lithium/common/cached_blockpos_iteration/LongList2BlockPosMutableIterable.java b/src/main/java/me/jellysquid/mods/lithium/common/cached_blockpos_iteration/LongList2BlockPosMutableIterable.java
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new file mode 100644
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index 0000000000000000000000000000000000000000..e2e4f7968a399b4641df07b2931fff6dbc85ddb3
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--- /dev/null
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+++ b/src/main/java/me/jellysquid/mods/lithium/common/cached_blockpos_iteration/LongList2BlockPosMutableIterable.java
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@@ -0,0 +1,47 @@
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+package me.jellysquid.mods.lithium.common.cached_blockpos_iteration;
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+
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+import it.unimi.dsi.fastutil.longs.LongIterator;
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+import it.unimi.dsi.fastutil.longs.LongList;
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+import net.minecraft.core.BlockPosition;
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+
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+import java.util.Iterator;
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+
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+/**
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+ * @author 2No2Name
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+ */
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+public class LongList2BlockPosMutableIterable implements Iterable<BlockPosition> {
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+
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+ private final LongList positions;
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+ private final int xOffset, yOffset, zOffset;
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+
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+ public LongList2BlockPosMutableIterable(BlockPosition offset, LongList posList) {
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+ this.xOffset = offset.getX();
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+ this.yOffset = offset.getY();
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+ this.zOffset = offset.getZ();
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+ this.positions = posList;
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+ }
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+
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+ @Override
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+ public Iterator<BlockPosition> iterator() {
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+ return new Iterator<BlockPosition>() {
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+
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+ private final LongIterator it = LongList2BlockPosMutableIterable.this.positions.iterator();
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+ private final BlockPosition.MutableBlockPosition pos = new BlockPosition.MutableBlockPosition();
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+
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+ @Override
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+ public boolean hasNext() {
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+ return it.hasNext();
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+ }
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+
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+ @Override
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+ public BlockPosition next() {
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+ long nextPos = this.it.nextLong();
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+ return this.pos.setValues(
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+ LongList2BlockPosMutableIterable.this.xOffset + BlockPosition.unpackLongX(nextPos),
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+ LongList2BlockPosMutableIterable.this.yOffset + BlockPosition.unpackLongY(nextPos),
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+ LongList2BlockPosMutableIterable.this.zOffset + BlockPosition.unpackLongZ(nextPos));
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+ }
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+ };
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+ }
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+
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+}
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\ No newline at end of file
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diff --git a/src/main/java/net/minecraft/core/BlockPosition.java b/src/main/java/net/minecraft/core/BlockPosition.java
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index 092de56e31257c1817a04cc9fc2f9c300bbfa058..bf2b1b19b7fa348c5fee61dd0e58144e2c06072f 100644
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--- a/src/main/java/net/minecraft/core/BlockPosition.java
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+++ b/src/main/java/net/minecraft/core/BlockPosition.java
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@@ -18,10 +18,16 @@ import net.minecraft.world.phys.Vec3D;
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import org.apache.commons.lang3.Validate;
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import org.apache.logging.log4j.LogManager;
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import org.apache.logging.log4j.Logger;
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+import me.jellysquid.mods.lithium.common.cached_blockpos_iteration.IterateOutwardsCache; // Yatopia
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+import me.jellysquid.mods.lithium.common.cached_blockpos_iteration.LongList2BlockPosMutableIterable; // Yatopia
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+import it.unimi.dsi.fastutil.longs.LongList; // Yatopia
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@Immutable
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public class BlockPosition extends BaseBlockPosition {
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+ private static final IterateOutwardsCache ITERATE_OUTWARDS_CACHE = new IterateOutwardsCache(50); // Yatopia
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+ private static final LongList HOGLIN_PIGLIN_CACHE = ITERATE_OUTWARDS_CACHE.getOrCompute(8, 4, 8); // Yatopia
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+
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public static final Codec<BlockPosition> a = Codec.INT_STREAM.comapFlatMap((intstream) -> {
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return SystemUtils.a(intstream, 3).map((aint) -> {
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return new BlockPosition(aint[0], aint[1], aint[2]);
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@@ -77,14 +83,17 @@ public class BlockPosition extends BaseBlockPosition {
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return a((int) (i >> 38) + j, (int) ((i << 52) >> 52) + k, (int) ((i << 26) >> 38) + l); // Paper - simplify/inline
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}
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+ public static int unpackLongX(long i) { return BlockPosition.b(i); } // Yatopia - OBFHELPER
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public static int b(long i) {
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return (int) (i >> 38); // Paper - simplify/inline
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}
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+ public static int unpackLongY(long i) { return BlockPosition.c(i); } // Yatopia - OBFHELPER
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public static int c(long i) {
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return (int) ((i << 52) >> 52); // Paper - simplify/inline
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}
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+ public static int unpackLongZ(long i) { return BlockPosition.d(i); } // Yatopia - OBFHELPER
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public static int d(long i) {
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return (int) ((i << 26) >> 38); // Paper - simplify/inline
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}
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@@ -265,7 +274,15 @@ public class BlockPosition extends BaseBlockPosition {
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};
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}
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+ public static Iterable<BlockPosition> iterateOutwards(BlockPosition blockposition, int p_i, int p_j, int p_k) { return BlockPosition.a(blockposition, p_i, p_j, p_k); } // Yatopia - OBFHELPER
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public static Iterable<BlockPosition> a(BlockPosition blockposition, int p_i, int p_j, int p_k) { // Paper - decompile issues - variable name conflicts to inner class field refs
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+ // Yatopia start - lithium: optimize `BlockPos.iterateOutwards` by caching offsets
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+ if (blockposition != me.jellysquid.mods.lithium.common.cached_blockpos_iteration.IterateOutwardsCache.POS_ZERO) {
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+ final LongList positions = p_i == 8 && p_j == 4 && p_k == 8 ? HOGLIN_PIGLIN_CACHE : ITERATE_OUTWARDS_CACHE.getOrCompute(p_i, p_j, p_j);
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+ return new LongList2BlockPosMutableIterable(blockposition, positions);
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+ }
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+ // Yatopia end
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+
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int l_decompiled = p_i + p_j + p_k; // Paper - decompile issues
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int i1 = blockposition.getX();
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int j1 = blockposition.getY();
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