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https://github.com/mkxp-z/mkxp-z.git
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fd822ea498
This allows libretro save states to actually behave the same every time you load them with respect to when randomly generated events occur and the random movements that NPCs make.
49 lines
1,017 B
Diff
49 lines
1,017 B
Diff
# Removes the dependency of the Ruby pseudorandom number generator's seed on the system time for better save state determinism.
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--- a/random.c
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+++ b/random.c
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@@ -680,28 +680,28 @@ static void
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fill_random_seed(uint32_t *seed, size_t cnt)
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{
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static rb_atomic_t n = 0;
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-#if defined HAVE_CLOCK_GETTIME
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- struct timespec tv;
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-#elif defined HAVE_GETTIMEOFDAY
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- struct timeval tv;
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-#endif
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size_t len = cnt * sizeof(*seed);
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memset(seed, 0, len);
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fill_random_bytes(seed, len, FALSE);
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-#if defined HAVE_CLOCK_GETTIME
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- clock_gettime(CLOCK_REALTIME, &tv);
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- seed[0] ^= tv.tv_nsec;
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-#elif defined HAVE_GETTIMEOFDAY
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- gettimeofday(&tv, 0);
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- seed[0] ^= tv.tv_usec;
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-#endif
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- seed[1] ^= (uint32_t)tv.tv_sec;
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-#if SIZEOF_TIME_T > SIZEOF_INT
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- seed[0] ^= (uint32_t)((time_t)tv.tv_sec >> SIZEOF_INT * CHAR_BIT);
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-#endif
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seed[2] ^= getpid() ^ (ATOMIC_FETCH_ADD(n, 1) << 16);
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seed[3] ^= (uint32_t)(VALUE)&seed;
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#if SIZEOF_VOIDP > SIZEOF_INT
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