Unify prng use

Finally drop all isaac references, do not use system rng any more. Drop
rng state from flam3_frame – it was not used anyway.

1 files changed, 0 insertions, 44 deletions

diff --git a/xorshift.c b/xorshift.c
deleted file mode 100644
index 9291b90..0000000
--- a/xorshift.c
+++ /dev/null
@@ -1,44 +0,0 @@
-/*	“An experimental exploration of Marsaglia’s xorshift generators,
- *	scrambled”, Sebastiano Vigna */
-
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <fcntl.h>
-#include <assert.h>
-#include <unistd.h>
-
-#include "xorshift.h"
-
-uint64_t xorshift_step (randctx * const st) {
-	uint64_t s0 = st->s[ st->p ];
-	uint64_t s1 = st->s[ st->p = ( st->p + 1 ) & (XORSHIFT_S-1) ];
-	s1 ^= s1 << 31; // a
-	s1 ^= s1 >> 11; // b
-	s0 ^= s0 >> 30; // c
-	return ( st->s[ st->p ] = s0 ^ s1 ) * 1181783497276652981LL;
-}
-
-static uint64_t rand64 () {
-	unsigned long long rand;
-	while (!__builtin_ia32_rdrand64_step (&rand));
-	return rand;
-}
-
-void xorshift_seed (randctx * const st) {
-	/* seed with high-quality randomness */
-	for (unsigned char i = 0; i < XORSHIFT_S; i++) {
-		st->s[i] = rand64 ();
-	}
-}
-
-#if 0
-uint64_t xorshift_step (randctx * const st) {
-	uint64_t x = st->s[0];
-	x ^= x >> 12; // a
-	x ^= x << 25; // b
-	x ^= x >> 27; // c
-	st->s[0] = x;
-	return x * 2685821657736338717LL;
-}
-#endif
-