From 8db15979a097c8aaa66c63d60da62c43cde80ed1 Mon Sep 17 00:00:00 2001
From: Frank <developer@ambertation.de>
Date: Thu, 9 Dec 2021 00:12:13 +0100
Subject: [PATCH] Ported old noise generator for double-block biomes

---
 .../ru/bclib/api/biomes/BCLBiomeBuilder.java  |  3 +-
 .../DoubleBlockSurfaceNoiseCondition.java     | 34 +++++++++++++++++++
 2 files changed, 36 insertions(+), 1 deletion(-)
 create mode 100644 src/main/java/ru/bclib/world/surface/DoubleBlockSurfaceNoiseCondition.java

diff --git a/src/main/java/ru/bclib/api/biomes/BCLBiomeBuilder.java b/src/main/java/ru/bclib/api/biomes/BCLBiomeBuilder.java
index 4e504863..a513c992 100644
--- a/src/main/java/ru/bclib/api/biomes/BCLBiomeBuilder.java
+++ b/src/main/java/ru/bclib/api/biomes/BCLBiomeBuilder.java
@@ -39,6 +39,7 @@ import ru.bclib.util.ColorUtil;
 import ru.bclib.world.biomes.BCLBiome;
 import ru.bclib.world.features.BCLFeature;
 import ru.bclib.world.structures.BCLStructureFeature;
+import ru.bclib.world.surface.DoubleBlockSurfaceNoiseCondition;
 
 public class BCLBiomeBuilder {
 	private static final BCLBiomeBuilder INSTANCE = new BCLBiomeBuilder();
@@ -538,7 +539,7 @@ public class BCLBiomeBuilder {
 			SurfaceRules.sequence(
 				SurfaceRules.ifTrue(SurfaceRules.ON_FLOOR,
 					SurfaceRules.sequence(
-						SurfaceRules.ifTrue(SurfaceRules.noiseCondition(Noises.SURFACE, -0.1818, 0.1818), surfaceBlockA),
+						SurfaceRules.ifTrue(DoubleBlockSurfaceNoiseCondition.CONDITION, surfaceBlockA),
 						surfaceBlockB
 					)
 				),
diff --git a/src/main/java/ru/bclib/world/surface/DoubleBlockSurfaceNoiseCondition.java b/src/main/java/ru/bclib/world/surface/DoubleBlockSurfaceNoiseCondition.java
new file mode 100644
index 00000000..e6f01c13
--- /dev/null
+++ b/src/main/java/ru/bclib/world/surface/DoubleBlockSurfaceNoiseCondition.java
@@ -0,0 +1,34 @@
+package ru.bclib.world.surface;
+
+import ru.bclib.api.biomes.SurfaceNoiseCondition;
+import ru.bclib.mixin.common.SurfaceRulesContextAccessor;
+import ru.bclib.noise.OpenSimplexNoise;
+import ru.bclib.util.MHelper;
+
+public class DoubleBlockSurfaceNoiseCondition extends SurfaceNoiseCondition {
+    public static final DoubleBlockSurfaceNoiseCondition CONDITION = new DoubleBlockSurfaceNoiseCondition(0);
+    private static final OpenSimplexNoise NOISE = new OpenSimplexNoise(4141);
+
+    private final double threshold;
+    public DoubleBlockSurfaceNoiseCondition(double threshold){
+        this.threshold = threshold;
+    }
+
+    private static int lastX = Integer.MIN_VALUE;
+    private static int lastZ = Integer.MIN_VALUE;
+    private static double lastValue = 0;
+
+    @Override
+    public boolean test(SurfaceRulesContextAccessor context) {
+        final int x = context.getBlockX();
+        final int z = context.getBlockZ();
+        if (lastX==x && lastZ==z) return lastValue > threshold;
+
+        double value = NOISE.eval(x * 0.1, z * 0.1) + MHelper.randRange(-0.4, 0.4, MHelper.RANDOM);
+
+        lastX=x;
+        lastZ=z;
+        lastValue=value;
+        return value > threshold;
+    }
+}