From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Tue, 29 Aug 2023 22:29:08 +0200
Subject: [PATCH] Faster floating-point positive modulo

License: GPL-3.0 (https://www.gnu.org/licenses/gpl-3.0.html)
Gale - https://galemc.org

diff --git a/net/minecraft/util/Mth.java b/net/minecraft/util/Mth.java
index 75da3011058918e1da6936522f19a2ccdb843d73..1b60fa34e4d6a5c00a983bf94e4d16d1eb46c665 100644
--- a/net/minecraft/util/Mth.java
+++ b/net/minecraft/util/Mth.java
@@ -149,14 +149,26 @@ public class Mth {
         return Math.floorMod(x, y);
     }
 
-    public static float positiveModulo(float numerator, float denominator) {
+    public static float positiveModuloForAnyDenominator(float numerator, float denominator) { // Gale - faster floating-point positive modulo
         return (numerator % denominator + denominator) % denominator;
     }
 
-    public static double positiveModulo(double numerator, double denominator) {
+    public static double positiveModuloForAnyDenominator(double numerator, double denominator) { // Gale - faster floating-point positive modulo
         return (numerator % denominator + denominator) % denominator;
     }
 
+    // Gale start - faster floating-point positive modulo
+    public static float positiveModuloForPositiveIntegerDenominator(float numerator, float denominator) {
+        var modulo = numerator % denominator;
+        return modulo < 0 ? modulo + denominator : modulo;
+    }
+
+    public static double positiveModuloForPositiveIntegerDenominator(double numerator, double denominator) {
+        var modulo = numerator % denominator;
+        return modulo < 0 ? modulo + denominator : modulo;
+    }
+    // Gale end - faster floating-point positive modulo
+
     public static boolean isMultipleOf(int number, int multiple) {
         return number % multiple == 0;
     }
diff --git a/net/minecraft/world/level/levelgen/blending/Blender.java b/net/minecraft/world/level/levelgen/blending/Blender.java
index 01e5b29d6e9a5c53c0e23b61ed0c1d7be1a0fe08..314a189e2099e3688fd23e7100120abea6886ccd 100644
--- a/net/minecraft/world/level/levelgen/blending/Blender.java
+++ b/net/minecraft/world/level/levelgen/blending/Blender.java
@@ -144,7 +144,7 @@ public class Blender {
     private static double heightToOffset(double height) {
         double d = 1.0;
         double d1 = height + 0.5;
-        double d2 = Mth.positiveModulo(d1, 8.0);
+        double d2 = Mth.positiveModuloForPositiveIntegerDenominator(d1, 8.0); // Gale - faster floating-point positive modulo
         return 1.0 * (32.0 * (d1 - 128.0) - 3.0 * (d1 - 120.0) * d2 + 3.0 * d2 * d2) / (128.0 * (32.0 - 3.0 * d2));
     }