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/* 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
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