From b691c43c44ff180d10e7d4a9afc83b98551ff586 Mon Sep 17 00:00:00 2001
From: daoge_cmd <3523206925@qq.com>
Date: Sun, 1 Mar 2026 12:16:08 +0800
Subject: Initial commit

---
 Minecraft.World/SimplexNoise.cpp | 476 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 476 insertions(+)
 create mode 100644 Minecraft.World/SimplexNoise.cpp

(limited to 'Minecraft.World/SimplexNoise.cpp')

diff --git a/Minecraft.World/SimplexNoise.cpp b/Minecraft.World/SimplexNoise.cpp
new file mode 100644
index 00000000..469e0b41
--- /dev/null
+++ b/Minecraft.World/SimplexNoise.cpp
@@ -0,0 +1,476 @@
+#include "stdafx.h"
+#include "SimplexNoise.h"
+
+int SimplexNoise::grad3[12][3] = { { 1, 1, 0 }, { -1, 1, 0 }, { 1, -1, 0 }, { -1, -1, 0 }, { 1, 0, 1 }, { -1, 0, 1 }, { 1, 0, -1 }, { -1, 0, -1 }, { 0, 1, 1 }, { 0, -1, 1 }, { 0, 1, -1 }, { 0, -1, -1 } };
+
+double SimplexNoise::F2 = 0.5 * (sqrt(3.0) - 1.0);
+double SimplexNoise::G2 = (3.0 - sqrt(3.0)) / 6.0;
+double SimplexNoise::F3 = 1.0 / 3.0;
+double SimplexNoise::G3 = 1.0 / 6.0;
+
+SimplexNoise::SimplexNoise()
+{
+	Random random;
+	init(&random);
+}
+
+SimplexNoise::SimplexNoise(Random *random)
+{
+	init(random);
+}
+
+void SimplexNoise::init(Random *random)
+{
+	p = new int[512];
+
+    xo = random->nextDouble() * 256;
+    yo = random->nextDouble() * 256;
+    zo = random->nextDouble() * 256;
+    for (int i = 0; i < 256; i++)
+	{
+        p[i] = i;
+    }
+
+    for (int i = 0; i < 256; i++)
+	{
+        int j = random->nextInt(256 - i) + i;
+        int tmp = p[i];
+        p[i] = p[j];
+        p[j] = tmp;
+
+        p[i + 256] = p[i];
+    }
+}
+
+SimplexNoise::~SimplexNoise()
+{
+	delete [] p;
+}
+
+int SimplexNoise::fastfloor(double x)
+{
+	return x > 0 ? (int) x : (int) x - 1;
+}
+
+double SimplexNoise::dot(int *g, double x, double y)
+{
+	return g[0] * x + g[1] * y;
+}
+
+double SimplexNoise::dot(int *g, double x, double y, double z)
+{
+	return g[0] * x + g[1] * y + g[2] * z;
+}
+
+double SimplexNoise::getValue(double xin, double yin)
+{
+    double n0, n1, n2; // Noise contributions from the three corners
+    // Skew the input space to determine which simplex cell we're in
+    double s = (xin + yin) * F2; // Hairy factor for 2D
+    int i = fastfloor(xin + s);
+    int j = fastfloor(yin + s);
+    double t = (i + j) * G2;
+    double X0 = i - t; // Unskew the cell origin back to (x,y) space
+    double Y0 = j - t;
+    double x0 = xin - X0; // The x,y distances from the cell origin
+    double y0 = yin - Y0;
+    // For the 2D case, the simplex shape is an equilateral triangle.
+    // Determine which simplex we are in.
+    int i1, j1; // Offsets for second (middle) corner of simplex in (i,j) coords
+    if (x0 > y0) {
+        i1 = 1;
+        j1 = 0;
+    } // lower triangle, XY order: (0,0)->(1,0)->(1,1)
+    else {
+        i1 = 0;
+        j1 = 1;
+    } // upper triangle, YX order: (0,0)->(0,1)->(1,1)
+    // A step of (1,0) in (i,j) means a step of (1-c,-c) in (x,y), and
+    // a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where
+    // c = (3-sqrt(3))/6
+    double x1 = x0 - i1 + G2; // Offsets for middle corner in (x,y) unskewed coords
+    double y1 = y0 - j1 + G2;
+    double x2 = x0 - 1.0 + 2.0 * G2; // Offsets for last corner in (x,y) unskewed coords
+    double y2 = y0 - 1.0 + 2.0 * G2;
+    // Work out the hashed gradient indices of the three simplex corners
+    int ii = i & 255;
+    int jj = j & 255;
+    int gi0 = p[ii + p[jj]] % 12;
+    int gi1 = p[ii + i1 + p[jj + j1]] % 12;
+    int gi2 = p[ii + 1 + p[jj + 1]] % 12;
+    // Calculate the contribution from the three corners
+    double t0 = 0.5 - x0 * x0 - y0 * y0;
+    if (t0 < 0) n0 = 0.0;
+    else {
+        t0 *= t0;
+        n0 = t0 * t0 * dot(grad3[gi0], x0, y0); // (x,y) of grad3 used for 2D gradient
+    }
+    double t1 = 0.5 - x1 * x1 - y1 * y1;
+    if (t1 < 0) n1 = 0.0;
+    else {
+        t1 *= t1;
+        n1 = t1 * t1 * dot(grad3[gi1], x1, y1);
+    }
+    double t2 = 0.5 - x2 * x2 - y2 * y2;
+    if (t2 < 0) n2 = 0.0;
+    else {
+        t2 *= t2;
+        n2 = t2 * t2 * dot(grad3[gi2], x2, y2);
+    }
+    // Add contributions from each corner to get the final noise value.
+    // The result is scaled to return values in the interval [-1,1].
+    return 70.0 * (n0 + n1 + n2);
+}
+
+double SimplexNoise::getValue(double xin, double yin, double zin)
+{
+    double n0, n1, n2, n3;
+    double s = (xin + yin + zin) * F3;
+    int i = fastfloor(xin + s);
+    int j = fastfloor(yin + s);
+    int k = fastfloor(zin + s);
+
+    double t = (i + j + k) * G3;
+    double X0 = i - t;
+    double Y0 = j - t;
+    double Z0 = k - t;
+    double x0 = xin - X0;
+    double y0 = yin - Y0;
+    double z0 = zin - Z0;
+    int i1, j1, k1;
+    int i2, j2, k2;
+    if (x0 >= y0)
+	{
+        if (y0 >= z0) 
+		{
+            i1 = 1;
+            j1 = 0;
+            k1 = 0;
+            i2 = 1;
+            j2 = 1;
+            k2 = 0;
+        } // X Y Z order
+        else if (x0 >= z0)
+		{
+            i1 = 1;
+            j1 = 0;
+            k1 = 0;
+            i2 = 1;
+            j2 = 0;
+            k2 = 1;
+        } // X Z Y order
+        else
+		{
+            i1 = 0;
+            j1 = 0;
+            k1 = 1;
+            i2 = 1;
+            j2 = 0;
+            k2 = 1;
+        } // Z X Y order
+    } 
+	else
+	{ // x0<y0
+        if (y0 < z0)
+		{
+            i1 = 0;
+            j1 = 0;
+            k1 = 1;
+            i2 = 0;
+            j2 = 1;
+            k2 = 1;
+        } // Z Y X order
+        else if (x0 < z0)
+		{
+            i1 = 0;
+            j1 = 1;
+            k1 = 0;
+            i2 = 0;
+            j2 = 1;
+            k2 = 1;
+        } // Y Z X order
+        else
+		{
+            i1 = 0;
+            j1 = 1;
+            k1 = 0;
+            i2 = 1;
+            j2 = 1;
+            k2 = 0;
+        } // Y X Z order
+    }
+    // A step of (1,0,0) in (i,j,k) means a step of (1-c,-c,-c) in (x,y,z),
+    // a step of (0,1,0) in (i,j,k) means a step of (-c,1-c,-c) in (x,y,z), and
+    // a step of (0,0,1) in (i,j,k) means a step of (-c,-c,1-c) in (x,y,z), where
+    // c = 1/6.   
+
+    double x1 = x0 - i1 + G3; // Offsets for second corner in (x,y,z) coords
+    double y1 = y0 - j1 + G3;
+    double z1 = z0 - k1 + G3;
+    double x2 = x0 - i2 + 2.0 * G3; // Offsets for third corner in (x,y,z) coords
+    double y2 = y0 - j2 + 2.0 * G3;
+    double z2 = z0 - k2 + 2.0 * G3;
+    double x3 = x0 - 1.0 + 3.0 * G3; // Offsets for last corner in (x,y,z) coords
+    double y3 = y0 - 1.0 + 3.0 * G3;
+    double z3 = z0 - 1.0 + 3.0 * G3;
+    // Work out the hashed gradient indices of the four simplex corners
+    int ii = i & 255;
+    int jj = j & 255;
+    int kk = k & 255;
+    int gi0 = p[ii + p[jj + p[kk]]] % 12;
+    int gi1 = p[ii + i1 + p[jj + j1 + p[kk + k1]]] % 12;
+    int gi2 = p[ii + i2 + p[jj + j2 + p[kk + k2]]] % 12;
+    int gi3 = p[ii + 1 + p[jj + 1 + p[kk + 1]]] % 12;
+    // Calculate the contribution from the four corners
+    double t0 = 0.6 - x0 * x0 - y0 * y0 - z0 * z0;
+    if (t0 < 0) n0 = 0.0;
+    else
+	{
+        t0 *= t0;
+        n0 = t0 * t0 * dot(grad3[gi0], x0, y0, z0);
+    }
+    double t1 = 0.6 - x1 * x1 - y1 * y1 - z1 * z1;
+    if (t1 < 0) n1 = 0.0;
+    else
+	{
+        t1 *= t1;
+        n1 = t1 * t1 * dot(grad3[gi1], x1, y1, z1);
+    }
+    double t2 = 0.6 - x2 * x2 - y2 * y2 - z2 * z2;
+    if (t2 < 0) n2 = 0.0;
+    else
+	{
+        t2 *= t2;
+        n2 = t2 * t2 * dot(grad3[gi2], x2, y2, z2);
+    }
+    double t3 = 0.6 - x3 * x3 - y3 * y3 - z3 * z3;
+    if (t3 < 0) n3 = 0.0;
+    else
+	{
+        t3 *= t3;
+        n3 = t3 * t3 * dot(grad3[gi3], x3, y3, z3);
+    }
+    // Add contributions from each corner to get the final noise value.
+    // The result is scaled to stay just inside [-1,1]
+    return 32.0 * (n0 + n1 + n2 + n3);
+}
+
+void SimplexNoise::add(doubleArray buffer, double _x, double _y, int xSize, int ySize, double xs, double ys, double pow)
+{
+    int pp = 0;
+    for (int xx = 0; xx < xSize; xx++)
+	{
+        double xin = (_x + xx) * xs + xo;
+        for (int yy = 0; yy < ySize; yy++)
+		{
+            double yin = (_y + yy) * ys + yo;
+                
+            double n0, n1, n2;
+            double s = (xin + yin) * F2; // Hairy factor for 2D
+            int i = fastfloor(xin + s);
+            int j = fastfloor(yin + s);
+            double t = (i + j) * G2;
+            double X0 = i - t; // Unskew the cell origin back to (x,y) space
+            double Y0 = j - t;
+            double x0 = xin - X0; // The x,y distances from the cell origin
+            double y0 = yin - Y0;
+            // For the 2D case, the simplex shape is an equilateral triangle.
+            // Determine which simplex we are in.
+            int i1, j1; // Offsets for second (middle) corner of simplex in (i,j) coords
+            if (x0 > y0)
+			{
+                i1 = 1;
+                j1 = 0;
+            } // lower triangle, XY order: (0,0)->(1,0)->(1,1)
+            else
+			{
+                i1 = 0;
+                j1 = 1;
+            } // upper triangle, YX order: (0,0)->(0,1)->(1,1)
+            // A step of (1,0) in (i,j) means a step of (1-c,-c) in (x,y), and
+            // a step of (0,1) in (i,j) means a step of (-c,1-c) in (x,y), where
+            // c = (3-sqrt(3))/6
+            double x1 = x0 - i1 + G2; // Offsets for middle corner in (x,y) unskewed coords
+            double y1 = y0 - j1 + G2;
+            double x2 = x0 - 1.0 + 2.0 * G2; // Offsets for last corner in (x,y) unskewed coords
+            double y2 = y0 - 1.0 + 2.0 * G2;
+            // Work out the hashed gradient indices of the three simplex corners
+            int ii = i & 255;
+            int jj = j & 255;
+            int gi0 = p[ii + p[jj]] % 12;
+            int gi1 = p[ii + i1 + p[jj + j1]] % 12;
+            int gi2 = p[ii + 1 + p[jj + 1]] % 12;
+            // Calculate the contribution from the three corners
+            double t0 = 0.5 - x0 * x0 - y0 * y0;
+            if (t0 < 0) n0 = 0.0;
+            else
+			{
+                t0 *= t0;
+                n0 = t0 * t0 * dot(grad3[gi0], x0, y0); // (x,y) of grad3 used for 2D gradient
+            }
+            double t1 = 0.5 - x1 * x1 - y1 * y1;
+            if (t1 < 0) n1 = 0.0;
+            else
+			{
+                t1 *= t1;
+                n1 = t1 * t1 * dot(grad3[gi1], x1, y1);
+            }
+            double t2 = 0.5 - x2 * x2 - y2 * y2;
+            if (t2 < 0) n2 = 0.0;
+            else
+			{
+                t2 *= t2;
+                n2 = t2 * t2 * dot(grad3[gi2], x2, y2);
+            }
+            // Add contributions from each corner to get the final noise value.
+            // The result is scaled to return values in the interval [-1,1].
+            buffer[pp++] += (70.0 * (n0 + n1 + n2))*pow;                    
+        }
+    }
+
+}
+void SimplexNoise::add(doubleArray buffer, double _x, double _y, double _z, int xSize, int ySize, int zSize, double xs, double ys, double zs, double pow)
+{
+    int pp = 0;
+    for (int xx = 0; xx < xSize; xx++)
+	{
+        double xin = (_x + xx) * xs + xo;
+        for (int zz = 0; zz < zSize; zz++)
+		{
+            double zin = (_z + zz) * zs + zo;
+            for (int yy = 0; yy < ySize; yy++)
+			{
+                double yin = (_y + yy) * ys + yo;
+                    
+                double n0, n1, n2, n3;
+                double s = (xin + yin + zin) * F3;
+                int i = fastfloor(xin + s);
+                int j = fastfloor(yin + s);
+                int k = fastfloor(zin + s);
+                double t = (i + j + k) * G3;
+                double X0 = i - t;
+                double Y0 = j - t;
+                double Z0 = k - t;
+                double x0 = xin - X0;
+                double y0 = yin - Y0;
+                double z0 = zin - Z0;
+                int i1, j1, k1;
+                int i2, j2, k2;
+                if (x0 >= y0)
+				{
+                    if (y0 >= z0)
+					{
+                        i1 = 1;
+                        j1 = 0;
+                        k1 = 0;
+                        i2 = 1;
+                        j2 = 1;
+                        k2 = 0;
+                    } // X Y Z order
+                    else if (x0 >= z0)
+					{
+                        i1 = 1;
+                        j1 = 0;
+                        k1 = 0;
+                        i2 = 1;
+                        j2 = 0;
+                        k2 = 1;
+                    } // X Z Y order
+                    else
+					{
+                        i1 = 0;
+                        j1 = 0;
+                        k1 = 1;
+                        i2 = 1;
+                        j2 = 0;
+                        k2 = 1;
+                    } // Z X Y order
+                }
+				else
+				{ // x0<y0
+                    if (y0 < z0)
+					{
+                        i1 = 0;
+                        j1 = 0;
+                        k1 = 1;
+                        i2 = 0;
+                        j2 = 1;
+                        k2 = 1;
+                    } // Z Y X order
+                    else if (x0 < z0)
+					{
+                        i1 = 0;
+                        j1 = 1;
+                        k1 = 0;
+                        i2 = 0;
+                        j2 = 1;
+                        k2 = 1;
+                    } // Y Z X order
+                    else
+					{
+                        i1 = 0;
+                        j1 = 1;
+                        k1 = 0;
+                        i2 = 1;
+                        j2 = 1;
+                        k2 = 0;
+                    } // Y X Z order
+                }
+                // A step of (1,0,0) in (i,j,k) means a step of (1-c,-c,-c) in (x,y,z),
+                // a step of (0,1,0) in (i,j,k) means a step of (-c,1-c,-c) in (x,y,z), and
+                // a step of (0,0,1) in (i,j,k) means a step of (-c,-c,1-c) in (x,y,z), where
+                // c = 1/6.   
+
+                double x1 = x0 - i1 + G3; // Offsets for second corner in (x,y,z) coords
+                double y1 = y0 - j1 + G3;
+                double z1 = z0 - k1 + G3;
+                double x2 = x0 - i2 + 2.0 * G3; // Offsets for third corner in (x,y,z) coords
+                double y2 = y0 - j2 + 2.0 * G3;
+                double z2 = z0 - k2 + 2.0 * G3;
+                double x3 = x0 - 1.0 + 3.0 * G3; // Offsets for last corner in (x,y,z) coords
+                double y3 = y0 - 1.0 + 3.0 * G3;
+                double z3 = z0 - 1.0 + 3.0 * G3;
+                // Work out the hashed gradient indices of the four simplex corners
+                int ii = i & 255;
+                int jj = j & 255;
+                int kk = k & 255;
+                int gi0 = p[ii + p[jj + p[kk]]] % 12;
+                int gi1 = p[ii + i1 + p[jj + j1 + p[kk + k1]]] % 12;
+                int gi2 = p[ii + i2 + p[jj + j2 + p[kk + k2]]] % 12;
+                int gi3 = p[ii + 1 + p[jj + 1 + p[kk + 1]]] % 12;
+                // Calculate the contribution from the four corners
+                double t0 = 0.6 - x0 * x0 - y0 * y0 - z0 * z0;
+                if (t0 < 0) n0 = 0.0;
+                else
+				{
+                    t0 *= t0;
+                    n0 = t0 * t0 * dot(grad3[gi0], x0, y0, z0);
+                }
+                double t1 = 0.6 - x1 * x1 - y1 * y1 - z1 * z1;
+                if (t1 < 0) n1 = 0.0;
+                else
+				{
+                    t1 *= t1;
+                    n1 = t1 * t1 * dot(grad3[gi1], x1, y1, z1);
+                }
+                double t2 = 0.6 - x2 * x2 - y2 * y2 - z2 * z2;
+                if (t2 < 0) n2 = 0.0;
+                else
+				{
+                    t2 *= t2;
+                    n2 = t2 * t2 * dot(grad3[gi2], x2, y2, z2);
+                }
+                double t3 = 0.6 - x3 * x3 - y3 * y3 - z3 * z3;
+                if (t3 < 0) n3 = 0.0;
+                else
+				{
+                    t3 *= t3;
+                    n3 = t3 * t3 * dot(grad3[gi3], x3, y3, z3);
+                }
+                // Add contributions from each corner to get the final noise value.
+                // The result is scaled to stay just inside [-1,1]
+                buffer[pp++] += (32.0 * (n0 + n1 + n2 + n3))*pow;
+            }
+        }
+    }
+}
\ No newline at end of file
-- 
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