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Accept hexadecimal and string values for seeds

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This commit is contained in:
kwolekr 2013-09-17 02:57:10 -04:00
parent 1a96987d0f
commit e46c527733
6 changed files with 68 additions and 2 deletions
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44
src/util/numeric.cpp
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@ -22,6 +22,7 @@ with this program; if not, write to the Free Software Foundation, Inc.,
#include "../log.h"
#include "../constants.h" // BS, MAP_BLOCKSIZE
#include <string.h>
#include <iostream>
// Calculate the borders of a "d-radius" cube
@ -139,6 +140,49 @@ int myrand_range(int min, int max)
return (myrand()%(max-min+1))+min;
}
// 64-bit unaligned version of MurmurHash
u64 murmur_hash_64_ua(const void *key, int len, unsigned int seed)
{
const u64 m = 0xc6a4a7935bd1e995;
const int r = 47;
u64 h = seed ^ (len * m);
const u64 *data = (const u64 *)key;
const u64 *end = data + (len / 8);
while (data != end) {
u64 k;
memcpy(&k, data, sizeof(u64));
data++;
k *= m;
k ^= k >> r;
k *= m;
h ^= k;
h *= m;
}
const unsigned char *data2 = (const unsigned char *)data;
switch (len & 7) {
case 7: h ^= (u64)data2[6] << 48;
case 6: h ^= (u64)data2[5] << 40;
case 5: h ^= (u64)data2[4] << 32;
case 4: h ^= (u64)data2[3] << 24;
case 3: h ^= (u64)data2[2] << 16;
case 2: h ^= (u64)data2[1] << 8;
case 1: h ^= (u64)data2[0];
h *= m;
}
h ^= h >> r;
h *= m;
h ^= h >> r;
return h;
}
/*
blockpos: position of block in block coordinates
camera_pos: position of camera in nodes