746dddc067
* Map is unnecessary and inefficient in almost every case. * Replaced by the new HashMap. * Renamed Map to RBMap and Set to RBSet for cases that still make sense (order matters) but use is discouraged. There were very few cases where replacing by HashMap was undesired because keeping the key order was intended. I tried to keep those (as RBMap) as much as possible, but might have missed some. Review appreciated!
313 lines
10 KiB
C++
313 lines
10 KiB
C++
/*************************************************************************/
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/* hashfuncs.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef HASHFUNCS_H
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#define HASHFUNCS_H
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#include "core/math/aabb.h"
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#include "core/math/math_defs.h"
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#include "core/math/math_funcs.h"
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#include "core/math/rect2.h"
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#include "core/math/rect2i.h"
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#include "core/math/vector2.h"
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#include "core/math/vector2i.h"
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#include "core/math/vector3.h"
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#include "core/math/vector3i.h"
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#include "core/object/object_id.h"
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#include "core/string/node_path.h"
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#include "core/string/string_name.h"
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#include "core/string/ustring.h"
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#include "core/templates/rid.h"
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#include "core/typedefs.h"
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/**
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* Hashing functions
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*/
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/**
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* DJB2 Hash function
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* @param C String
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* @return 32-bits hashcode
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*/
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static inline uint32_t hash_djb2(const char *p_cstr) {
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const unsigned char *chr = (const unsigned char *)p_cstr;
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uint32_t hash = 5381;
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uint32_t c;
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while ((c = *chr++)) {
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hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
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}
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return hash;
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}
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static inline uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len, uint32_t p_prev = 5381) {
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uint32_t hash = p_prev;
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for (int i = 0; i < p_len; i++) {
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hash = ((hash << 5) + hash) + p_buff[i]; /* hash * 33 + c */
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}
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return hash;
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}
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static inline uint32_t hash_djb2_one_32(uint32_t p_in, uint32_t p_prev = 5381) {
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return ((p_prev << 5) + p_prev) + p_in;
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}
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/**
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* Thomas Wang's 64-bit to 32-bit Hash function:
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* https://web.archive.org/web/20071223173210/https:/www.concentric.net/~Ttwang/tech/inthash.htm
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*
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* @param p_int - 64-bit unsigned integer key to be hashed
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* @return unsigned 32-bit value representing hashcode
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*/
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static inline uint32_t hash_one_uint64(const uint64_t p_int) {
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uint64_t v = p_int;
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v = (~v) + (v << 18); // v = (v << 18) - v - 1;
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v = v ^ (v >> 31);
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v = v * 21; // v = (v + (v << 2)) + (v << 4);
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v = v ^ (v >> 11);
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v = v + (v << 6);
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v = v ^ (v >> 22);
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return uint32_t(v);
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}
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static inline uint32_t hash_djb2_one_float(double p_in, uint32_t p_prev = 5381) {
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union {
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double d;
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uint64_t i;
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} u;
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// Normalize +/- 0.0 and NaN values so they hash the same.
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if (p_in == 0.0f) {
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u.d = 0.0;
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} else if (Math::is_nan(p_in)) {
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u.d = NAN;
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} else {
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u.d = p_in;
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}
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return ((p_prev << 5) + p_prev) + hash_one_uint64(u.i);
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}
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template <class T>
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static inline uint32_t make_uint32_t(T p_in) {
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union {
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T t;
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uint32_t _u32;
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} _u;
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_u._u32 = 0;
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_u.t = p_in;
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return _u._u32;
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}
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static inline uint64_t hash_djb2_one_float_64(double p_in, uint64_t p_prev = 5381) {
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union {
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double d;
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uint64_t i;
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} u;
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// Normalize +/- 0.0 and NaN values so they hash the same.
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if (p_in == 0.0f) {
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u.d = 0.0;
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} else if (Math::is_nan(p_in)) {
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u.d = NAN;
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} else {
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u.d = p_in;
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}
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return ((p_prev << 5) + p_prev) + u.i;
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}
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static inline uint64_t hash_djb2_one_64(uint64_t p_in, uint64_t p_prev = 5381) {
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return ((p_prev << 5) + p_prev) + p_in;
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}
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template <class T>
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static inline uint64_t make_uint64_t(T p_in) {
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union {
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T t;
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uint64_t _u64;
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} _u;
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_u._u64 = 0; // in case p_in is smaller
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_u.t = p_in;
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return _u._u64;
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}
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template <class T>
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class Ref;
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struct HashMapHasherDefault {
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static _FORCE_INLINE_ uint32_t hash(const String &p_string) { return p_string.hash(); }
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static _FORCE_INLINE_ uint32_t hash(const char *p_cstr) { return hash_djb2(p_cstr); }
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static _FORCE_INLINE_ uint32_t hash(const uint64_t p_int) { return hash_one_uint64(p_int); }
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static _FORCE_INLINE_ uint32_t hash(const ObjectID &p_id) { return hash_one_uint64(p_id); }
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static _FORCE_INLINE_ uint32_t hash(const int64_t p_int) { return hash(uint64_t(p_int)); }
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static _FORCE_INLINE_ uint32_t hash(const float p_float) { return hash_djb2_one_float(p_float); }
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static _FORCE_INLINE_ uint32_t hash(const double p_double) { return hash_djb2_one_float(p_double); }
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static _FORCE_INLINE_ uint32_t hash(const uint32_t p_int) { return p_int; }
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static _FORCE_INLINE_ uint32_t hash(const int32_t p_int) { return (uint32_t)p_int; }
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static _FORCE_INLINE_ uint32_t hash(const uint16_t p_int) { return p_int; }
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static _FORCE_INLINE_ uint32_t hash(const int16_t p_int) { return (uint32_t)p_int; }
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static _FORCE_INLINE_ uint32_t hash(const uint8_t p_int) { return p_int; }
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static _FORCE_INLINE_ uint32_t hash(const int8_t p_int) { return (uint32_t)p_int; }
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static _FORCE_INLINE_ uint32_t hash(const wchar_t p_wchar) { return (uint32_t)p_wchar; }
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static _FORCE_INLINE_ uint32_t hash(const char16_t p_uchar) { return (uint32_t)p_uchar; }
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static _FORCE_INLINE_ uint32_t hash(const char32_t p_uchar) { return (uint32_t)p_uchar; }
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static _FORCE_INLINE_ uint32_t hash(const RID &p_rid) { return hash_one_uint64(p_rid.get_id()); }
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static _FORCE_INLINE_ uint32_t hash(const StringName &p_string_name) { return p_string_name.hash(); }
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static _FORCE_INLINE_ uint32_t hash(const NodePath &p_path) { return p_path.hash(); }
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template <class T>
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static _FORCE_INLINE_ uint32_t hash(const T *p_pointer) { return hash_one_uint64((uint64_t)p_pointer); }
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template <class T>
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static _FORCE_INLINE_ uint32_t hash(const Ref<T> &p_ref) { return hash_one_uint64((uint64_t)p_ref.operator->()); }
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static _FORCE_INLINE_ uint32_t hash(const Vector2i &p_vec) {
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uint32_t h = hash_djb2_one_32(p_vec.x);
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return hash_djb2_one_32(p_vec.y, h);
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}
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static _FORCE_INLINE_ uint32_t hash(const Vector3i &p_vec) {
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uint32_t h = hash_djb2_one_32(p_vec.x);
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h = hash_djb2_one_32(p_vec.y, h);
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return hash_djb2_one_32(p_vec.z, h);
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}
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static _FORCE_INLINE_ uint32_t hash(const Vector2 &p_vec) {
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uint32_t h = hash_djb2_one_float(p_vec.x);
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return hash_djb2_one_float(p_vec.y, h);
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}
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static _FORCE_INLINE_ uint32_t hash(const Vector3 &p_vec) {
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uint32_t h = hash_djb2_one_float(p_vec.x);
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h = hash_djb2_one_float(p_vec.y, h);
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return hash_djb2_one_float(p_vec.z, h);
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}
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static _FORCE_INLINE_ uint32_t hash(const Rect2i &p_rect) {
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uint32_t h = hash_djb2_one_32(p_rect.position.x);
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h = hash_djb2_one_32(p_rect.position.y, h);
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h = hash_djb2_one_32(p_rect.size.x, h);
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return hash_djb2_one_32(p_rect.size.y, h);
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}
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static _FORCE_INLINE_ uint32_t hash(const Rect2 &p_rect) {
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uint32_t h = hash_djb2_one_float(p_rect.position.x);
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h = hash_djb2_one_float(p_rect.position.y, h);
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h = hash_djb2_one_float(p_rect.size.x, h);
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return hash_djb2_one_float(p_rect.size.y, h);
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}
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static _FORCE_INLINE_ uint32_t hash(const AABB &p_aabb) {
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uint32_t h = hash_djb2_one_float(p_aabb.position.x);
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h = hash_djb2_one_float(p_aabb.position.y, h);
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h = hash_djb2_one_float(p_aabb.position.z, h);
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h = hash_djb2_one_float(p_aabb.size.x, h);
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h = hash_djb2_one_float(p_aabb.size.y, h);
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return hash_djb2_one_float(p_aabb.size.z, h);
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}
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//static _FORCE_INLINE_ uint32_t hash(const void* p_ptr) { return uint32_t(uint64_t(p_ptr))*(0x9e3779b1L); }
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};
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template <typename T>
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struct HashMapComparatorDefault {
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static bool compare(const T &p_lhs, const T &p_rhs) {
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return p_lhs == p_rhs;
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}
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};
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template <>
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struct HashMapComparatorDefault<float> {
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static bool compare(const float &p_lhs, const float &p_rhs) {
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return (p_lhs == p_rhs) || (Math::is_nan(p_lhs) && Math::is_nan(p_rhs));
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}
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};
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template <>
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struct HashMapComparatorDefault<double> {
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static bool compare(const double &p_lhs, const double &p_rhs) {
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return (p_lhs == p_rhs) || (Math::is_nan(p_lhs) && Math::is_nan(p_rhs));
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}
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};
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template <>
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struct HashMapComparatorDefault<Vector2> {
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static bool compare(const Vector2 &p_lhs, const Vector2 &p_rhs) {
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return ((p_lhs.x == p_rhs.x) || (Math::is_nan(p_lhs.x) && Math::is_nan(p_rhs.x))) && ((p_lhs.y == p_rhs.y) || (Math::is_nan(p_lhs.y) && Math::is_nan(p_rhs.y)));
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}
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};
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template <>
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struct HashMapComparatorDefault<Vector3> {
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static bool compare(const Vector3 &p_lhs, const Vector3 &p_rhs) {
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return ((p_lhs.x == p_rhs.x) || (Math::is_nan(p_lhs.x) && Math::is_nan(p_rhs.x))) && ((p_lhs.y == p_rhs.y) || (Math::is_nan(p_lhs.y) && Math::is_nan(p_rhs.y))) && ((p_lhs.z == p_rhs.z) || (Math::is_nan(p_lhs.z) && Math::is_nan(p_rhs.z)));
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}
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};
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constexpr uint32_t HASH_TABLE_SIZE_MAX = 29;
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const uint32_t hash_table_size_primes[HASH_TABLE_SIZE_MAX] = {
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5,
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13,
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23,
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47,
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97,
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193,
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389,
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769,
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1543,
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3079,
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6151,
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12289,
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24593,
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49157,
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98317,
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196613,
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393241,
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786433,
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1572869,
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3145739,
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6291469,
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12582917,
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25165843,
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50331653,
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100663319,
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201326611,
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402653189,
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805306457,
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1610612741,
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};
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#endif // HASHFUNCS_H
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