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util: move rand_xorshift128plus() to utils

Browse source 
V2: pass the seed to rand_xorshift128plus() so that we can isolate
    its uses.

Reviewed-by: Grazvydas Ignotas <notasas@gmail.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
This commit is contained in:
Timothy Arceri 2017-03-22 10:47:05 +11:00
parent e11049f2c3
commit 53660c2366
4 changed files with 60 additions and 19 deletions
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24
src/gallium/drivers/radeon/r600_test_dma.c
View file

@ -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);
}
}
}

2
src/util/Makefile.sources
View file

@ -25,6 +25,8 @@ MESA_UTIL_FILES := \
sha1/sha1.h \
ralloc.c \
ralloc.h \
rand_xor.c \
rand_xor.h \
register_allocate.c \
register_allocate.h \
rgtc.c \

20
src/util/rand_xor.c Normal file
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@ -0,0 +1,20 @@
#include "rand_xor.h"
/* Super fast random number generator.
*
* This rand_xorshift128plus function by Sebastiano Vigna belongs
* to the public domain.
*/
uint64_t
rand_xorshift128plus(uint64_t *seed)
{
uint64_t *s = seed;
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;
}

33
src/util/rand_xor.h Normal file
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@ -0,0 +1,33 @@
/*
* 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.
*
*/
#ifndef RAND_XOR_H
#define RAND_XOR_H
#include <stdint.h>
uint64_t
rand_xorshift128plus(uint64_t *seed);
#endif /* RAND_XOR_H */