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63 lines
3.8 KiB
Diff
63 lines
3.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: SuperCoder7979 <25208576+SuperCoder7979@users.noreply.github.com>
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Date: Tue, 3 Nov 2020 23:48:05 -0600
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Subject: [PATCH] Significantly improve performance of the end generation
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This patch implements a noise cache for the end which significantly reduces the computation time of generation. This results in about a 3x improvement.
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Original code by SuperCoder7979 and Gegy in Lithium, licensed under LGPL-3.0 (Source: https://github.com/jellysquid3/lithium-fabric)
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Co-authored-by: Gegy <gegy1000@gmail.com>
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Co-authored-by: Dylan Xaldin <Puremin0rez515@gmail.com>
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Co-authored-by: pop4959 <pop4959@gmail.com>
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diff --git a/src/main/java/net/minecraft/world/level/levelgen/DensityFunctions.java b/src/main/java/net/minecraft/world/level/levelgen/DensityFunctions.java
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index fac92f37c32e0398ebc05d9a0378446fcabaef1a..1beacd84bb0eee1f3e8f451fc1c514e23cc62826 100644
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--- a/src/main/java/net/minecraft/world/level/levelgen/DensityFunctions.java
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+++ b/src/main/java/net/minecraft/world/level/levelgen/DensityFunctions.java
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@@ -490,6 +490,16 @@ public final class DensityFunctions {
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public static final KeyDispatchDataCodec<DensityFunctions.EndIslandDensityFunction> CODEC = KeyDispatchDataCodec.of(MapCodec.unit(new DensityFunctions.EndIslandDensityFunction(0L)));
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private static final float ISLAND_THRESHOLD = -0.9F;
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private final SimplexNoise islandNoise;
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+ // Paper start
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+ private static final class NoiseCache {
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+ public long[] keys = new long[8192];
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+ public float[] values = new float[8192];
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+ public NoiseCache() {
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+ java.util.Arrays.fill(keys, Long.MIN_VALUE);
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+ }
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+ }
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+ private static final ThreadLocal<java.util.Map<SimplexNoise, NoiseCache>> noiseCache = ThreadLocal.withInitial(java.util.WeakHashMap::new);
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+ // Paper end
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public EndIslandDensityFunction(long seed) {
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RandomSource randomSource = new LegacyRandomSource(seed);
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@@ -505,12 +515,26 @@ public final class DensityFunctions {
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float f = 100.0F - Mth.sqrt((long) x * (long) x + (long) z * (long) z) * 8.0F; // Paper - cast ints to long to avoid integer overflow
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f = Mth.clamp(f, -100.0F, 80.0F);
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+ NoiseCache cache = noiseCache.get().computeIfAbsent(sampler, noiseKey -> new NoiseCache()); // Paper
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for(int m = -12; m <= 12; ++m) {
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for(int n = -12; n <= 12; ++n) {
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long o = (long)(i + m);
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long p = (long)(j + n);
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- if (o * o + p * p > 4096L && sampler.getValue((double)o, (double)p) < (double)-0.9F) {
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- float g = (Mth.abs((float)o) * 3439.0F + Mth.abs((float)p) * 147.0F) % 13.0F + 9.0F;
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+ // Paper start - Significantly improve end generation performance by using a noise cache
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+ long key = net.minecraft.world.level.ChunkPos.asLong((int) o, (int) p);
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+ int index = (int) it.unimi.dsi.fastutil.HashCommon.mix(key) & 8191;
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+ float g = Float.MIN_VALUE;
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+ if (cache.keys[index] == key) {
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+ g = cache.values[index];
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+ } else {
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+ if (o * o + p * p > 4096L && sampler.getValue((double)o, (double)p) < (double)-0.9F) {
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+ g = (Mth.abs((float) o) * 3439.0F + Mth.abs((float) p) * 147.0F) % 13.0F + 9.0F;
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+ }
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+ cache.keys[index] = key;
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+ cache.values[index] = g;
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+ }
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+ if (g != Float.MIN_VALUE) {
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+ // Paper end
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float h = (float)(k - m * 2);
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float q = (float)(l - n * 2);
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float r = 100.0F - Mth.sqrt(h * h + q * q) * g;
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