util/rand_xor: add function to seed rand

[mesa.git] / src / gallium / drivers / radeon / r600_test_dma.c

diff --git a/src/gallium/drivers/radeon/r600_test_dma.c b/src/gallium/drivers/radeon/r600_test_dma.c
index f7e9eb5fc38495223f1cf0d45724d3cdba020b9b..3c23b0932947b1e005b8546cba360270001d8d90 100644 (file)
--- a/src/gallium/drivers/radeon/r600_test_dma.c
+++ b/src/gallium/drivers/radeon/r600_test_dma.c
@@ -26,26 +26,10 @@
 
 #include "r600_pipe_common.h"
 #include "util/u_surface.h"
+#include "util/rand_xor.h"
 
 static uint64_t seed_xorshift128plus[2];
 
-/* Super fast random number generator.
- *
- * This rand_xorshift128plus function by Sebastiano Vigna belongs
- * to the public domain.
- */
-static uint64_t rand_xorshift128plus(void)
-{
-       uint64_t *s = seed_xorshift128plus;
-
-       uint64_t s1 = s[0];
-       const uint64_t s0 = s[1];
-       s[0] = s0;
-       s1 ^= s1 << 23;
-       s[1] = s1 ^ s0 ^ (s1 >> 18) ^ (s0 >> 5);
-       return s[1] + s0;
-}
-
 #define RAND_NUM_SIZE 8
 
 /* The GPU blits are emulated on the CPU using these CPU textures. */
@@ -91,8 +75,10 @@ static void set_random_pixels(struct pipe_context *ctx,
                        assert(t->stride % RAND_NUM_SIZE == 0);
                        assert(cpu->stride % RAND_NUM_SIZE == 0);
 
-                       for (x = 0; x < size; x++)
-                               *ptr++ = *ptr_cpu++ = rand_xorshift128plus();
+                       for (x = 0; x < size; x++) {
+                               *ptr++ = *ptr_cpu++ =
+                                       rand_xorshift128plus(seed_xorshift128plus);
+                       }
                }
        }
 
@@ -197,8 +183,7 @@ void r600_test_dma(struct r600_common_screen *rscreen)
        /* the seed for random test parameters */
        srand(0x9b47d95b);
        /* the seed for random pixel data */
-       seed_xorshift128plus[0] = 0x3bffb83978e24f88;
-       seed_xorshift128plus[1] = 0x9238d5d56c71cd35;
+       s_rand_xorshift128plus(seed_xorshift128plus, false);
 
        iterations = 1000000000; /* just kill it when you are bored */
        num_partial_copies = 30;