1 /*
2 * This program is free software; you can redistribute it and/or
3 * modify it under the terms of the GNU General Public License
4 * as published by the Free Software Foundation; either version 2
5 * of the License, or (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software Foundation,
14 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
15 */
16
17 #pragma once
18
19 /** \file
20 * \ingroup bli
21 */
22
23 #include "BLI_utildefines.h"
24
25 #ifdef __cplusplus
26 extern "C" {
27 #endif
28
BLI_hash_int_2d(unsigned int kx,unsigned int ky)29 BLI_INLINE unsigned int BLI_hash_int_2d(unsigned int kx, unsigned int ky)
30 {
31 #define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
32
33 unsigned int a, b, c;
34
35 a = b = c = 0xdeadbeef + (2 << 2) + 13;
36 a += kx;
37 b += ky;
38
39 c ^= b;
40 c -= rot(b, 14);
41 a ^= c;
42 a -= rot(c, 11);
43 b ^= a;
44 b -= rot(a, 25);
45 c ^= b;
46 c -= rot(b, 16);
47 a ^= c;
48 a -= rot(c, 4);
49 b ^= a;
50 b -= rot(a, 14);
51 c ^= b;
52 c -= rot(b, 24);
53
54 return c;
55
56 #undef rot
57 }
58
BLI_hash_string(const char * str)59 BLI_INLINE unsigned int BLI_hash_string(const char *str)
60 {
61 unsigned int i = 0, c;
62
63 while ((c = *str++)) {
64 i = i * 37 + c;
65 }
66 return i;
67 }
68
BLI_hash_int(unsigned int k)69 BLI_INLINE unsigned int BLI_hash_int(unsigned int k)
70 {
71 return BLI_hash_int_2d(k, 0);
72 }
73
BLI_hash_int_01(unsigned int k)74 BLI_INLINE float BLI_hash_int_01(unsigned int k)
75 {
76 return (float)BLI_hash_int(k) * (1.0f / (float)0xFFFFFFFF);
77 }
78
BLI_hash_pointer_to_color(const void * ptr,int * r,int * g,int * b)79 BLI_INLINE void BLI_hash_pointer_to_color(const void *ptr, int *r, int *g, int *b)
80 {
81 size_t val = (size_t)ptr;
82 const size_t hash_a = BLI_hash_int(val & 0x0000ffff);
83 const size_t hash_b = BLI_hash_int((uint)((val & 0xffff0000) >> 16));
84 const size_t hash = hash_a ^ (hash_b + 0x9e3779b9 + (hash_a << 6) + (hash_a >> 2));
85 *r = (hash & 0xff0000) >> 16;
86 *g = (hash & 0x00ff00) >> 8;
87 *b = hash & 0x0000ff;
88 }
89
90 #ifdef __cplusplus
91 }
92 #endif
93