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modern seeding of mersenne twister

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This commit is contained in:
Sean Barrett 2020-07-13 02:20:07 -07:00
parent a2c91804a3
commit c5b527aa01
1 changed files with 4 additions and 5 deletions
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9
stb.h
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@ -6163,7 +6163,7 @@ static char **readdir_raw(char *dir, int return_subdirs, char *mask)
if (!stb_strscpy(buffer+n,"*.*",sizeof(buffer)-n)) if (!stb_strscpy(buffer+n,"*.*",sizeof(buffer)-n))
return NULL; return NULL;
ws = stb__from_utf8(buffer); ws = stb__from_utf8(buffer);
z = _wfindfirst((const wchar_t *)ws, &data); z = _wfindfirst((wchar_t *)ws, &data);
#else #else
z = opendir(dir); z = opendir(dir);
#endif #endif
@ -8429,10 +8429,9 @@ unsigned int stb__mt_buffer[STB__MT_LEN];
void stb_srand(unsigned int seed) void stb_srand(unsigned int seed)
{ {
int i; int i;
unsigned int old = stb_srandLCG(seed); stb__mt_buffer[0]= seed & 0xffffffffUL;
for (i = 0; i < STB__MT_LEN; i++) for (i=1 ; i < STB__MT_LEN; ++i)
stb__mt_buffer[i] = stb_randLCG(); stb__mt_buffer[i] = (1812433253UL * (stb__mt_buffer[i-1] ^ (stb__mt_buffer[i-1] >> 30)) + i);
stb_srandLCG(old);
stb__mt_index = STB__MT_LEN*sizeof(unsigned int); stb__mt_index = STB__MT_LEN*sizeof(unsigned int);
} }