c1bc70b711
A lot of files were missing copyright field in the header and
the Blender Foundation contributed to them in a sense of bug
fixing and general maintenance.
This change makes it explicit that those files are at least
partially copyrighted by the Blender Foundation.
Note that this does not make it so the Blender Foundation is
the only holder of the copyright in those files, and developers
who do not have a signed contract with the foundation still
hold the copyright as well.
Another aspect of this change is using SPDX format for the
header. We already used it for the license specification,
and now we state it for the copyright as well, following the
FAQ:
https://reuse.software/faq/
115 lines
2.2 KiB
C
115 lines
2.2 KiB
C
/* SPDX-FileCopyrightText: 2023 Blender Foundation
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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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