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murdle
2026-03-01 02:38:58 +02:00
commit 19250b9db4
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Minecraft.World/FastNoise.cpp Normal file
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#include "stdafx.h"
#include "FastNoise.h"
FastNoise::FastNoise(int levels)
{
Random random;
init(&random, levels);
}
FastNoise::FastNoise(Random *random, int levels)
{
init(random,levels);
}
void FastNoise::init(Random *random, int levels)
{
this->levels = levels;
noiseMaps = new byte *[levels];
for (int i = 0; i < levels; i++)
{
noiseMaps[i] = new byte[0x100000];
random->nextBytes(noiseMaps[i],0x100000);
}
}
FastNoise::~FastNoise()
{
for( int i = 0; i < levels; i++ )
{
delete [] noiseMaps[i];
}
delete [] noiseMaps;
}
doubleArray FastNoise::getRegion(doubleArray buffer, double x, double y, double z, int xSize, int ySize, int zSize, double xScale, double yScale, double zScale)
{
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;
int AA = 487211441;
int BB = 21771;
for (int i = 0; i < levels; i++)
{
byte *map = noiseMaps[i];
int pp = 0;
for (int zp = 0; zp < zSize; zp++)
{
double zz = (z + zp) * zScale;
int Z = (int) zz;
if (zz < Z) Z -= 1;
int zl = (int) ((zz - Z) * 65536);
for (int yp = 0; yp < ySize; yp++)
{
double yy = (y + yp) * yScale;
int Y = (int) yy;
if (yy < Y) Y -= 1;
int yl = (int) ((yy - Y) * 65536);
for (int xp = 0; xp < xSize; xp++)
{
double xx = (x + xp) * xScale;
int X = (int) xx;
if (xx < X) X -= 1;
int xl = (int) ((xx - X) * 65536);
int X0 = (X + 0) * AA;
int X1 = (X + 1) * AA;
int Y0 = (Y + 0);
int Y1 = (Y + 1);
int Z0 = (Z + 0);
int Z1 = (Z + 1);
int X0Y0 = (X0 + Y0) * BB;
int X1Y0 = (X1 + Y0) * BB;
int X0Y1 = (X0 + Y1) * BB;
int X1Y1 = (X1 + Y1) * BB;
int a = map[(X0Y0 + Z0) & 0xfffff];
int b = map[(X1Y0 + Z0) & 0xfffff];
int c = map[(X0Y1 + Z0) & 0xfffff];
int d = map[(X1Y1 + Z0) & 0xfffff];
int e = map[(X0Y0 + Z1) & 0xfffff];
int f = map[(X1Y0 + Z1) & 0xfffff];
int g = map[(X0Y1 + Z1) & 0xfffff];
int h = map[(X1Y1 + Z1) & 0xfffff];
int ab = a + (((b - a) * xl) >> 16);
int cd = c + (((d - c) * xl) >> 16);
int ef = e + (((f - e) * xl) >> 16);
int gh = g + (((h - g) * xl) >> 16);
int abcd = ab + (((cd - ab) * yl) >> 16);
int efgh = ef + (((gh - ef) * yl) >> 16);
int res = abcd + (((efgh - abcd) * zl) >> 16);
buffer[pp++] += res*pow;
}
}
}
pow /= 2;
xScale*=2;
yScale*=2;
zScale*=2;
}
return buffer;
}