1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup bli
*/
#include "BLI_utildefines.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* Jenkins Lookup3 Hash Functions.
* Source: http://burtleburtle.net/bob/c/lookup3.c
*/
#define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
#define final(a, b, c) \
{ \
c ^= b; \
c -= rot(b, 14); \
a ^= c; \
a -= rot(c, 11); \
b ^= a; \
b -= rot(a, 25); \
c ^= b; \
c -= rot(b, 16); \
a ^= c; \
a -= rot(c, 4); \
b ^= a; \
b -= rot(a, 14); \
c ^= b; \
c -= rot(b, 24); \
} \
((void)0)
BLI_INLINE unsigned int BLI_hash_int_3d(unsigned int kx, unsigned int ky, unsigned int kz)
{
unsigned int a, b, c;
a = b = c = 0xdeadbeef + (3 << 2) + 13;
c += kz;
b += ky;
a += kx;
final(a, b, c);
return c;
}
BLI_INLINE unsigned int BLI_hash_int_2d(unsigned int kx, unsigned int ky)
{
unsigned int a, b, c;
a = b = c = 0xdeadbeef + (2 << 2) + 13;
a += kx;
b += ky;
final(a, b, c);
return c;
}
#undef final
#undef rot
BLI_INLINE unsigned int BLI_hash_string(const char *str)
{
unsigned int i = 0, c;
while ((c = *str++)) {
i = i * 37 + c;
}
return i;
}
BLI_INLINE float BLI_hash_int_2d_to_float(uint32_t kx, uint32_t ky)
{
return (float)BLI_hash_int_2d(kx, ky) / (float)0xFFFFFFFFu;
}
BLI_INLINE float BLI_hash_int_3d_to_float(uint32_t kx, uint32_t ky, uint32_t kz)
{
return (float)BLI_hash_int_3d(kx, ky, kz) / (float)0xFFFFFFFFu;
}
BLI_INLINE unsigned int BLI_hash_int(unsigned int k)
{
return BLI_hash_int_2d(k, 0);
}
BLI_INLINE float BLI_hash_int_01(unsigned int k)
{
return (float)BLI_hash_int(k) * (1.0f / (float)0xFFFFFFFF);
}
BLI_INLINE void BLI_hash_pointer_to_color(const void *ptr, int *r, int *g, int *b)
{
size_t val = (size_t)ptr;
const size_t hash_a = BLI_hash_int(val & 0x0000ffff);
const size_t hash_b = BLI_hash_int((uint)((val & 0xffff0000) >> 16));
const size_t hash = hash_a ^ (hash_b + 0x9e3779b9 + (hash_a << 6) + (hash_a >> 2));
*r = (hash & 0xff0000) >> 16;
*g = (hash & 0x00ff00) >> 8;
*b = hash & 0x0000ff;
}
#ifdef __cplusplus
}
#endif
|
