mirror of
https://github.com/PaperMC/Paper.git
synced 2024-11-04 18:01:17 +01:00
135 lines
7.1 KiB
Diff
135 lines
7.1 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Aikar <aikar@aikar.co>
|
|
Date: Tue, 4 Aug 2020 22:24:15 +0200
|
|
Subject: [PATCH] Optimize Pathfinder - Remove Streams / Optimized collections
|
|
|
|
I utilized the IDE to convert streams to non streams code, so shouldn't
|
|
be any risk of behavior change. Only did minor optimization of the
|
|
generated code set to remove unnecessary things.
|
|
|
|
I expect us to just drop this patch on next major update and re-apply
|
|
it with the IDE again and re-apply the collections optimization.
|
|
|
|
Optimize collection by creating a list instead of a set of the key and value.
|
|
|
|
This lets us get faster foreach iteration, as well as avoids map lookups on
|
|
the values when needed.
|
|
|
|
diff --git a/src/main/java/net/minecraft/world/level/pathfinder/PathFinder.java b/src/main/java/net/minecraft/world/level/pathfinder/PathFinder.java
|
|
index 8519383a9abd45434c1e9888e77548941a80c79c..1d51e113b17a5c522fa7812b1c1f38bf790d8335 100644
|
|
--- a/src/main/java/net/minecraft/world/level/pathfinder/PathFinder.java
|
|
+++ b/src/main/java/net/minecraft/world/level/pathfinder/PathFinder.java
|
|
@@ -38,9 +38,12 @@ public class PathFinder {
|
|
if (node == null) {
|
|
return null;
|
|
} else {
|
|
- Map<Target, BlockPos> map = positions.stream().collect(Collectors.toMap((pos) -> {
|
|
- return this.nodeEvaluator.getGoal((double)pos.getX(), (double)pos.getY(), (double)pos.getZ());
|
|
- }, Function.identity()));
|
|
+ // Paper start - Perf: remove streams and optimize collection
|
|
+ List<Map.Entry<Target, BlockPos>> map = Lists.newArrayList();
|
|
+ for (BlockPos pos : positions) {
|
|
+ map.add(new java.util.AbstractMap.SimpleEntry<>(this.nodeEvaluator.getGoal(pos.getX(), pos.getY(), pos.getZ()), pos));
|
|
+ }
|
|
+ // Paper end - Perf: remove streams and optimize collection
|
|
Path path = this.findPath(world.getProfiler(), node, map, followRange, distance, rangeMultiplier);
|
|
this.nodeEvaluator.done();
|
|
return path;
|
|
@@ -48,18 +51,19 @@ public class PathFinder {
|
|
}
|
|
|
|
@Nullable
|
|
- private Path findPath(ProfilerFiller profiler, Node startNode, Map<Target, BlockPos> positions, float followRange, int distance, float rangeMultiplier) {
|
|
+ // Paper start - Perf: remove streams and optimize collection - optimize collection
|
|
+ private Path findPath(ProfilerFiller profiler, Node startNode, List<Map.Entry<Target, BlockPos>> positions, float followRange, int distance, float rangeMultiplier) {
|
|
profiler.push("find_path");
|
|
profiler.markForCharting(MetricCategory.PATH_FINDING);
|
|
- Set<Target> set = positions.keySet();
|
|
+ // Set<Target> set = positions.keySet();
|
|
startNode.g = 0.0F;
|
|
- startNode.h = this.getBestH(startNode, set);
|
|
+ startNode.h = this.getBestH(startNode, positions); // Paper - optimize collection
|
|
startNode.f = startNode.h;
|
|
this.openSet.clear();
|
|
this.openSet.insert(startNode);
|
|
- Set<Node> set2 = ImmutableSet.of();
|
|
+ // Set<Node> set2 = ImmutableSet.of(); // Paper - unused - diff on change
|
|
int i = 0;
|
|
- Set<Target> set3 = Sets.newHashSetWithExpectedSize(set.size());
|
|
+ List<Map.Entry<Target, BlockPos>> entryList = Lists.newArrayListWithExpectedSize(positions.size()); // Paper - optimize collection
|
|
int j = (int)((float)this.maxVisitedNodes * rangeMultiplier);
|
|
|
|
while(!this.openSet.isEmpty()) {
|
|
@@ -71,14 +75,18 @@ public class PathFinder {
|
|
Node node = this.openSet.pop();
|
|
node.closed = true;
|
|
|
|
- for(Target target : set) {
|
|
+ // Paper start - optimize collection
|
|
+ for(int i1 = 0; i1 < positions.size(); i1++) {
|
|
+ final Map.Entry<Target, BlockPos> entry = positions.get(i1);
|
|
+ Target target = entry.getKey();
|
|
if (node.distanceManhattan(target) <= (float)distance) {
|
|
target.setReached();
|
|
- set3.add(target);
|
|
+ entryList.add(entry);
|
|
+ // Paper end - Perf: remove streams and optimize collection
|
|
}
|
|
}
|
|
|
|
- if (!set3.isEmpty()) {
|
|
+ if (!entryList.isEmpty()) { // Paper - Perf: remove streams and optimize collection; rename
|
|
break;
|
|
}
|
|
|
|
@@ -93,7 +101,7 @@ public class PathFinder {
|
|
if (node2.walkedDistance < followRange && (!node2.inOpenSet() || g < node2.g)) {
|
|
node2.cameFrom = node;
|
|
node2.g = g;
|
|
- node2.h = this.getBestH(node2, set) * 1.5F;
|
|
+ node2.h = this.getBestH(node2, positions) * 1.5F; // Paper - Perf: remove streams and optimize collection
|
|
if (node2.inOpenSet()) {
|
|
this.openSet.changeCost(node2, node2.g + node2.h);
|
|
} else {
|
|
@@ -105,23 +113,31 @@ public class PathFinder {
|
|
}
|
|
}
|
|
|
|
- Optional<Path> optional = !set3.isEmpty() ? set3.stream().map((node) -> {
|
|
- return this.reconstructPath(node.getBestNode(), positions.get(node), true);
|
|
- }).min(Comparator.comparingInt(Path::getNodeCount)) : set.stream().map((target) -> {
|
|
- return this.reconstructPath(target.getBestNode(), positions.get(target), false);
|
|
- }).min(Comparator.comparingDouble(Path::getDistToTarget).thenComparingInt(Path::getNodeCount));
|
|
- profiler.pop();
|
|
- return optional.isEmpty() ? null : optional.get();
|
|
+ // Paper start - Perf: remove streams and optimize collection
|
|
+ Path best = null;
|
|
+ boolean entryListIsEmpty = entryList.isEmpty();
|
|
+ Comparator<Path> comparator = entryListIsEmpty ? Comparator.comparingInt(Path::getNodeCount)
|
|
+ : Comparator.comparingDouble(Path::getDistToTarget).thenComparingInt(Path::getNodeCount);
|
|
+ for (Map.Entry<Target, BlockPos> entry : entryListIsEmpty ? positions : entryList) {
|
|
+ Path path = this.reconstructPath(entry.getKey().getBestNode(), entry.getValue(), !entryListIsEmpty);
|
|
+ if (best == null || comparator.compare(path, best) < 0)
|
|
+ best = path;
|
|
+ }
|
|
+ return best;
|
|
+ // Paper end - Perf: remove streams and optimize collection
|
|
}
|
|
|
|
protected float distance(Node a, Node b) {
|
|
return a.distanceTo(b);
|
|
}
|
|
|
|
- private float getBestH(Node node, Set<Target> targets) {
|
|
+ private float getBestH(Node node, List<Map.Entry<Target, BlockPos>> targets) { // Paper - Perf: remove streams and optimize collection; Set<Target> -> List<Map.Entry<Target, BlockPos>>
|
|
float f = Float.MAX_VALUE;
|
|
|
|
- for(Target target : targets) {
|
|
+ // Paper start - Perf: remove streams and optimize collection
|
|
+ for (int i = 0, targetsSize = targets.size(); i < targetsSize; i++) {
|
|
+ final Target target = targets.get(i).getKey();
|
|
+ // Paper end - Perf: remove streams and optimize collection
|
|
float g = node.distanceTo(target);
|
|
target.updateBest(g, node);
|
|
f = Math.min(g, f);
|