1 files changed, 115 insertions, 0 deletions

diff --git a/Minecraft.World/PerlinSimplexNoise.cpp b/Minecraft.World/PerlinSimplexNoise.cpp
new file mode 100644
index 00000000..dbc570a4
--- /dev/null
+++ b/Minecraft.World/PerlinSimplexNoise.cpp
@@ -0,0 +1,115 @@
+#include "stdafx.h"
+#include "PerlinSimplexNoise.h"
+
+PerlinSimplexNoise::PerlinSimplexNoise(int levels)
+{
+	Random random;
+	init(&random,levels);
+}
+
+PerlinSimplexNoise::PerlinSimplexNoise(Random *random, int levels)
+{
+	init(random,levels);
+	delete random;
+}
+
+void PerlinSimplexNoise::init(Random *random, int levels)
+{
+	MemSect(3);
+    this->levels = levels;
+    noiseLevels = new SimplexNoise *[levels];
+    for (int i = 0; i < levels; i++)
+	{
+        noiseLevels[i] = new SimplexNoise(random);
+    }
+	MemSect(0);
+}
+
+PerlinSimplexNoise::~PerlinSimplexNoise()
+{
+	for(int i = 0; i < levels; i++ )
+	{
+		delete noiseLevels[i];
+	}
+	delete[] noiseLevels;
+}
+
+double PerlinSimplexNoise::getValue(double x, double y)
+{
+    double value = 0;
+    double pow = 1;
+
+    for (int i = 0; i < levels; i++)
+	{
+        value += noiseLevels[i]->getValue(x * pow, y * pow) / pow;
+        pow /= 2;
+    }
+
+    return value;
+}
+
+double PerlinSimplexNoise::getValue(double x, double y, double z)
+{
+    double value = 0;
+    double pow = 1;
+
+    for (int i = 0; i < levels; i++)
+	{
+        value += noiseLevels[i]->getValue(x * pow, y * pow, z * pow) / pow;
+        pow /= 2;
+    }
+
+    return value;
+}
+
+doubleArray PerlinSimplexNoise::getRegion(doubleArray buffer, double x, double y, int xSize, int ySize, double xScale, double yScale, double sizeScale)
+{
+	return getRegion(buffer, x, y, xSize, ySize, xScale, yScale, sizeScale, 0.5);
+}
+
+doubleArray PerlinSimplexNoise::getRegion(doubleArray buffer, double x, double y, int xSize, int ySize, double xScale, double yScale, double sizeScale, double powScale)
+{
+    xScale/=1.5;
+    yScale/=1.5;
+
+	if (buffer.data == NULL || (int) buffer.length < xSize * ySize)
+	{
+		if( buffer.data ) delete [] buffer.data;
+		buffer = doubleArray(xSize * ySize);
+	}
+    else for (unsigned int i = 0; i < buffer.length; i++)
+        buffer[i] = 0;
+
+
+    double pow = 1;
+    double scale = 1;
+    for (int i = 0; i < levels; i++)
+	{
+        noiseLevels[i]->add(buffer, x, y, xSize, ySize, xScale * scale, yScale * scale, 0.55/pow);
+        scale *= sizeScale;
+        pow *= powScale;
+    }
+
+    return buffer;
+}
+
+doubleArray PerlinSimplexNoise::getRegion(doubleArray buffer, double x, double y, double z, int xSize, int ySize, int zSize, double xScale, double yScale, double zScale)
+{
+    xScale/=1.5;
+    yScale/=1.5;
+
+    if (buffer.data == NULL) buffer = doubleArray(xSize * ySize * zSize);
+    else for (unsigned int i = 0; i < buffer.length; i++)
+        buffer[i] = 0;
+
+
+    double pow = 1;
+
+    for (int i = 0; i < levels; i++) {
+        //            value += noiseLevels[i].getValue(x * pow, y * pow, z * pow) / pow;
+        noiseLevels[i]->add(buffer, x, y, z, xSize, ySize, zSize, xScale * pow, yScale * pow, zScale * pow, 0.55/pow);
+        pow *= 0.5;
+    }
+
+    return buffer;
+}
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