intel/nir: Stop using nir_lower_vars_to_scratch

[mesa.git] / src / util / rand_xor.c

diff --git a/src/util/rand_xor.c b/src/util/rand_xor.c
index 07b4c22ee15a7f1cc2a17137bf495847d73d327b..81b64f1ea71712a49338e5b77bf9ae166413e671 100644 (file)
--- a/src/util/rand_xor.c
+++ b/src/util/rand_xor.c
@@ -1,3 +1,39 @@
+/*
+ * Copyright 2017 Timothy Arceri
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#include "detect_os.h"
+
+#if !DETECT_OS_WINDOWS
+#if defined(HAVE_GETRANDOM)
+#include <sys/random.h>
+#endif
+#include <unistd.h>
+#include <fcntl.h>
+#endif
+
+#include <time.h>
+
 #include "rand_xor.h"
 
 /* Super fast random number generator.
@@ -6,7 +42,7 @@
  * to the public domain.
  */
 uint64_t
-rand_xorshift128plus(uint64_t *seed)
+rand_xorshift128plus(uint64_t seed[2])
 {
    uint64_t *s = seed;
 
@@ -18,3 +54,36 @@ rand_xorshift128plus(uint64_t *seed)
 
    return s[1] + s0;
 }
+
+void
+s_rand_xorshift128plus(uint64_t seed[2], bool randomised_seed)
+{
+   if (!randomised_seed) {
+      /* Use a fixed seed */
+      seed[0] = 0x3bffb83978e24f88;
+      seed[1] = 0x9238d5d56c71cd35;
+      return;
+   }
+
+#if !DETECT_OS_WINDOWS
+   size_t seed_size = sizeof(uint64_t) * 2;
+
+#if defined(HAVE_GETRANDOM)
+   ssize_t ret = getrandom(seed, seed_size, GRND_NONBLOCK);
+   if (ret == seed_size)
+      return;
+#endif
+
+   int fd = open("/dev/urandom", O_RDONLY);
+   if (fd >= 0) {
+      if (read(fd, seed, seed_size) == seed_size) {
+         close(fd);
+         return;
+      }
+      close(fd);
+   }
+#endif
+
+   seed[0] = 0x3bffb83978e24f88;
+   seed[1] = time(NULL);
+}