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70131e856d609c6b82bcf6b1a1ce861f9a73b001
MiraiMC/patches/server/0063-c2me-opts-math.patch
Arthur Blanchot 70131e856d Add Petal patches + refactor configuration
2022-07-21 19:36:05 +02:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: ishland <ishlandmc@yeah.net>
Date: Tue, 21 Sep 2021 10:37:34 +0200
Subject: [PATCH] c2me: opts math
Copyright (c) 2021-2022 ishland
Original code by RelativityMC, licensed under MIT
You can find the original code on https://github.com/RelativityMC/C2ME-fabric (Yarn mappings)
diff --git a/src/main/java/net/minecraft/world/level/levelgen/synth/ImprovedNoise.java b/src/main/java/net/minecraft/world/level/levelgen/synth/ImprovedNoise.java
index fb84d703b4461343d50510d7c9be32fc1f09ed22..3da6b30febc98e5392e42d39c5bd69a82116dc2d 100644
--- a/src/main/java/net/minecraft/world/level/levelgen/synth/ImprovedNoise.java
+++ b/src/main/java/net/minecraft/world/level/levelgen/synth/ImprovedNoise.java
@@ -11,6 +11,27 @@ public final class ImprovedNoise {
public final double yo;
public final double zo;
+ // Mirai start - c2me: opts math
+ private static final double[] FLAT_SIMPLEX_GRAD = new double[]{
+ 1, 1, 0, 0,
+ -1, 1, 0, 0,
+ 1, -1, 0, 0,
+ -1, -1, 0, 0,
+ 1, 0, 1, 0,
+ -1, 0, 1, 0,
+ 1, 0, -1, 0,
+ -1, 0, -1, 0,
+ 0, 1, 1, 0,
+ 0, -1, 1, 0,
+ 0, 1, -1, 0,
+ 0, -1, -1, 0,
+ 1, 1, 0, 0,
+ 0, -1, 1, 0,
+ -1, 1, 0, 0,
+ 0, -1, -1, 0,
+ };
+ // Mirai end
+
public ImprovedNoise(RandomSource random) {
this.xo = random.nextDouble() * 256.0D;
this.yo = random.nextDouble() * 256.0D;
@@ -34,34 +55,38 @@ public final class ImprovedNoise {
return this.noise(x, y, z, 0.0D, 0.0D);
}
+ // Mirai start - c2me: opts math
+ /**
+ * @author ishland
+ * @reason optimize: remove frequent type conversions
+ */
/** @deprecated */
@Deprecated
public double noise(double x, double y, double z, double yScale, double yMax) {
double d = x + this.xo;
double e = y + this.yo;
double f = z + this.zo;
- int i = Mth.floor(d);
- int j = Mth.floor(e);
- int k = Mth.floor(f);
- double g = d - (double)i;
- double h = e - (double)j;
- double l = f - (double)k;
- double o;
- if (yScale != 0.0D) {
+ double i = Mth.floor(d);
+ double j = Mth.floor(e);
+ double k = Mth.floor(f);
+ double g = d - i;
+ double h = e - j;
+ double l = f - k;
+ double o = 0.0D;
+ if (yScale != 0.0) {
double m;
- if (yMax >= 0.0D && yMax < h) {
+ if (yMax >= 0.0 && yMax < h) {
m = yMax;
} else {
m = h;
}
- o = (double)Mth.floor(m / yScale + (double)1.0E-7F) * yScale;
- } else {
- o = 0.0D;
+ o = Mth.floor(m / yScale + 1.0E-7F) * yScale;
}
- return this.sampleAndLerp(i, j, k, g, h - o, l, h);
+ return this.sampleAndLerp((int) i, (int) j, (int) k, g, h - o, l, h);
}
+ // Mirai end
public double noiseWithDerivative(double x, double y, double z, double[] ds) {
double d = x + this.xo;
@@ -84,26 +109,76 @@ public final class ImprovedNoise {
return this.p[input & 255] & 255;
}
- private double sampleAndLerp(int sectionX, int sectionY, int sectionZ, double localX, double localY, double localZ, double fadeLocalY) {
- int i = this.p(sectionX);
- int j = this.p(sectionX + 1);
- int k = this.p(i + sectionY);
- int l = this.p(i + sectionY + 1);
- int m = this.p(j + sectionY);
- int n = this.p(j + sectionY + 1);
- double d = gradDot(this.p(k + sectionZ), localX, localY, localZ);
- double e = gradDot(this.p(m + sectionZ), localX - 1.0D, localY, localZ);
- double f = gradDot(this.p(l + sectionZ), localX, localY - 1.0D, localZ);
- double g = gradDot(this.p(n + sectionZ), localX - 1.0D, localY - 1.0D, localZ);
- double h = gradDot(this.p(k + sectionZ + 1), localX, localY, localZ - 1.0D);
- double o = gradDot(this.p(m + sectionZ + 1), localX - 1.0D, localY, localZ - 1.0D);
- double p = gradDot(this.p(l + sectionZ + 1), localX, localY - 1.0D, localZ - 1.0D);
- double q = gradDot(this.p(n + sectionZ + 1), localX - 1.0D, localY - 1.0D, localZ - 1.0D);
- double r = Mth.smoothstep(localX);
- double s = Mth.smoothstep(fadeLocalY);
- double t = Mth.smoothstep(localZ);
- return Mth.lerp3(r, s, t, d, e, f, g, h, o, p, q);
+ // Mirai start - c2me: opts math
+ /**
+ * @author ishland
+ * @reason inline math & small optimization: remove frequent type conversions and redundant ops
+ */
+ private double sampleAndLerp(int sectionX, int sectionY, int sectionZ, double localX, double localY, double localZ, double fadeLocalX) {
+ // TODO [VanillaCopy] but optimized
+ final int var0 = sectionX & 0xFF;
+ final int var1 = (sectionX + 1) & 0xFF;
+ final int var2 = this.p[var0] & 0xFF;
+ final int var3 = this.p[var1] & 0xFF;
+ final int var4 = (var2 + sectionY) & 0xFF;
+ final int var5 = (var3 + sectionY) & 0xFF;
+ final int var6 = (var2 + sectionY + 1) & 0xFF;
+ final int var7 = (var3 + sectionY + 1) & 0xFF;
+ final int var8 = this.p[var4] & 0xFF;
+ final int var9 = this.p[var5] & 0xFF;
+ final int var10 = this.p[var6] & 0xFF;
+ final int var11 = this.p[var7] & 0xFF;
+
+ final int var12 = (var8 + sectionZ) & 0xFF;
+ final int var13 = (var9 + sectionZ) & 0xFF;
+ final int var14 = (var10 + sectionZ) & 0xFF;
+ final int var15 = (var11 + sectionZ) & 0xFF;
+ final int var16 = (var8 + sectionZ + 1) & 0xFF;
+ final int var17 = (var9 + sectionZ + 1) & 0xFF;
+ final int var18 = (var10 + sectionZ + 1) & 0xFF;
+ final int var19 = (var11 + sectionZ + 1) & 0xFF;
+ final int var20 = (this.p[var12] & 15) << 2;
+ final int var21 = (this.p[var13] & 15) << 2;
+ final int var22 = (this.p[var14] & 15) << 2;
+ final int var23 = (this.p[var15] & 15) << 2;
+ final int var24 = (this.p[var16] & 15) << 2;
+ final int var25 = (this.p[var17] & 15) << 2;
+ final int var26 = (this.p[var18] & 15) << 2;
+ final int var27 = (this.p[var19] & 15) << 2;
+ final double var60 = localX - 1.0;
+ final double var61 = localY - 1.0;
+ final double var62 = localZ - 1.0;
+ final double var87 = FLAT_SIMPLEX_GRAD[(var20) | 0] * localX + FLAT_SIMPLEX_GRAD[(var20) | 1] * localY + FLAT_SIMPLEX_GRAD[(var20) | 2] * localZ;
+ final double var88 = FLAT_SIMPLEX_GRAD[(var21) | 0] * var60 + FLAT_SIMPLEX_GRAD[(var21) | 1] * localY + FLAT_SIMPLEX_GRAD[(var21) | 2] * localZ;
+ final double var89 = FLAT_SIMPLEX_GRAD[(var22) | 0] * localX + FLAT_SIMPLEX_GRAD[(var22) | 1] * var61 + FLAT_SIMPLEX_GRAD[(var22) | 2] * localZ;
+ final double var90 = FLAT_SIMPLEX_GRAD[(var23) | 0] * var60 + FLAT_SIMPLEX_GRAD[(var23) | 1] * var61 + FLAT_SIMPLEX_GRAD[(var23) | 2] * localZ;
+ final double var91 = FLAT_SIMPLEX_GRAD[(var24) | 0] * localX + FLAT_SIMPLEX_GRAD[(var24) | 1] * localY + FLAT_SIMPLEX_GRAD[(var24) | 2] * var62;
+ final double var92 = FLAT_SIMPLEX_GRAD[(var25) | 0] * var60 + FLAT_SIMPLEX_GRAD[(var25) | 1] * localY + FLAT_SIMPLEX_GRAD[(var25) | 2] * var62;
+ final double var93 = FLAT_SIMPLEX_GRAD[(var26) | 0] * localX + FLAT_SIMPLEX_GRAD[(var26) | 1] * var61 + FLAT_SIMPLEX_GRAD[(var26) | 2] * var62;
+ final double var94 = FLAT_SIMPLEX_GRAD[(var27) | 0] * var60 + FLAT_SIMPLEX_GRAD[(var27) | 1] * var61 + FLAT_SIMPLEX_GRAD[(var27) | 2] * var62;
+
+ final double var95 = localX * 6.0 - 15.0;
+ final double var96 = fadeLocalX * 6.0 - 15.0;
+ final double var97 = localZ * 6.0 - 15.0;
+ final double var98 = localX * var95 + 10.0;
+ final double var99 = fadeLocalX * var96 + 10.0;
+ final double var100 = localZ * var97 + 10.0;
+ final double var101 = localX * localX * localX * var98;
+ final double var102 = fadeLocalX * fadeLocalX * fadeLocalX * var99;
+ final double var103 = localZ * localZ * localZ * var100;
+
+ final double var113 = var87 + var101 * (var88 - var87);
+ final double var114 = var93 + var101 * (var94 - var93);
+ final double var115 = var91 + var101 * (var92 - var91);
+ final double var116 = var89 + var101 * (var90 - var89);
+ final double var117 = var114 - var115;
+ final double var118 = var102 * (var116 - var113);
+ final double var119 = var102 * var117;
+ final double var120 = var113 + var118;
+ final double var121 = var115 + var119;
+ return var120 + (var103 * (var121 - var120));
}
+ // Mirai end
private double sampleWithDerivative(int sectionX, int sectionY, int sectionZ, double localX, double localY, double localZ, double[] ds) {
int i = this.p(sectionX);
diff --git a/src/main/java/net/minecraft/world/level/levelgen/synth/PerlinNoise.java b/src/main/java/net/minecraft/world/level/levelgen/synth/PerlinNoise.java
index 02d176dd374b806cb004056964c1c4ee9e73072b..d9db7842a3dfe9432f436047417b0ff18a25b627 100644
--- a/src/main/java/net/minecraft/world/level/levelgen/synth/PerlinNoise.java
+++ b/src/main/java/net/minecraft/world/level/levelgen/synth/PerlinNoise.java
@@ -25,6 +25,10 @@ public class PerlinNoise {
private final double lowestFreqValueFactor;
private final double lowestFreqInputFactor;
private final double maxValue;
+ // Mirai start - c2me: opts math
+ private int octaveSamplersCount = 0;
+ private double[] amplitudesArray = null;
+ // Mirai end
/** @deprecated */
@Deprecated
@@ -130,6 +134,10 @@ public class PerlinNoise {
this.lowestFreqInputFactor = Math.pow(2.0D, (double)(-j));
this.lowestFreqValueFactor = Math.pow(2.0D, (double)(i - 1)) / (Math.pow(2.0D, (double)i) - 1.0D);
this.maxValue = this.edgeValue(2.0D);
+ // Mirai start - c2me: opts math
+ this.octaveSamplersCount = this.noiseLevels.length;
+ this.amplitudesArray = this.amplitudes.toDoubleArray();
+ // Mirai end
}
protected double maxValue() {
@@ -140,9 +148,33 @@ public class PerlinNoise {
random.consumeCount(262);
}
+ // Mirai start - c2me: opts math
+ /**
+ * @author ishland
+ * @reason optimize for common cases
+ */
public double getValue(double x, double y, double z) {
- return this.getValue(x, y, z, 0.0D, 0.0D, false);
+ double d = 0.0;
+ double e = this.lowestFreqInputFactor;
+ double f = this.lowestFreqValueFactor;
+
+ for(int i = 0; i < this.octaveSamplersCount; ++i) {
+ ImprovedNoise perlinNoiseSampler = this.noiseLevels[i];
+ if (perlinNoiseSampler != null) {
+ @SuppressWarnings("deprecation")
+ double g = perlinNoiseSampler.noise(
+ wrap(x * e), wrap(y * e), wrap(z * e), 0.0, 0.0
+ );
+ d += this.amplitudesArray[i] * g * f;
+ }
+
+ e *= 2.0;
+ f /= 2.0;
+ }
+
+ return d;
}
+ // Mirai end
/** @deprecated */
@Deprecated
@@ -190,9 +222,15 @@ public class PerlinNoise {
return this.noiseLevels[this.noiseLevels.length - 1 - octave];
}
+ // Mirai start - c2me: opts math
+ /**
+ * @author ishland
+ * @reason remove frequent type conversion
+ */
public static double wrap(double value) {
- return value - (double)Mth.lfloor(value / 3.3554432E7D + 0.5D) * 3.3554432E7D;
+ return value - Mth.lfloor(value / 3.3554432E7 + 0.5) * 3.3554432E7;
}
+ // Mirai end
protected int firstOctave() {
return this.firstOctave;
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