115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bli
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*/
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#include "BLI_utildefines.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Jenkins Lookup3 Hash Functions.
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* Source: http://burtleburtle.net/bob/c/lookup3.c
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*/
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#define rot(x, k) (((x) << (k)) | ((x) >> (32 - (k))))
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#define final(a, b, c) \
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{ \
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c ^= b; \
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c -= rot(b, 14); \
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a ^= c; \
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a -= rot(c, 11); \
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b ^= a; \
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b -= rot(a, 25); \
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c ^= b; \
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c -= rot(b, 16); \
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a ^= c; \
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a -= rot(c, 4); \
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b ^= a; \
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b -= rot(a, 14); \
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c ^= b; \
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c -= rot(b, 24); \
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} \
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((void)0)
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BLI_INLINE unsigned int BLI_hash_int_3d(unsigned int kx, unsigned int ky, unsigned int kz)
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{
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unsigned int a, b, c;
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a = b = c = 0xdeadbeef + (3 << 2) + 13;
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c += kz;
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b += ky;
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a += kx;
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final(a, b, c);
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return c;
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}
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BLI_INLINE unsigned int BLI_hash_int_2d(unsigned int kx, unsigned int ky)
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{
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unsigned int a, b, c;
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a = b = c = 0xdeadbeef + (2 << 2) + 13;
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a += kx;
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b += ky;
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final(a, b, c);
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return c;
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}
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#undef final
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#undef rot
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BLI_INLINE unsigned int BLI_hash_string(const char *str)
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{
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unsigned int i = 0, c;
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while ((c = *str++)) {
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i = i * 37 + c;
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}
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return i;
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}
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BLI_INLINE float BLI_hash_int_2d_to_float(uint32_t kx, uint32_t ky)
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{
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return (float)BLI_hash_int_2d(kx, ky) / (float)0xFFFFFFFFu;
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}
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BLI_INLINE float BLI_hash_int_3d_to_float(uint32_t kx, uint32_t ky, uint32_t kz)
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{
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return (float)BLI_hash_int_3d(kx, ky, kz) / (float)0xFFFFFFFFu;
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}
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BLI_INLINE unsigned int BLI_hash_int(unsigned int k)
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{
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return BLI_hash_int_2d(k, 0);
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}
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BLI_INLINE float BLI_hash_int_01(unsigned int k)
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{
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return (float)BLI_hash_int(k) * (1.0f / (float)0xFFFFFFFF);
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}
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BLI_INLINE void BLI_hash_pointer_to_color(const void *ptr, int *r, int *g, int *b)
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{
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size_t val = (size_t)ptr;
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const size_t hash_a = BLI_hash_int(val & 0x0000ffff);
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const size_t hash_b = BLI_hash_int((uint)((val & 0xffff0000) >> 16));
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const size_t hash = hash_a ^ (hash_b + 0x9e3779b9 + (hash_a << 6) + (hash_a >> 2));
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*r = (hash & 0xff0000) >> 16;
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*g = (hash & 0x00ff00) >> 8;
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*b = hash & 0x0000ff;
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}
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#ifdef __cplusplus
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}
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#endif
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