diff options
Diffstat (limited to 'core/templates/hashfuncs.h')
| -rw-r--r-- | core/templates/hashfuncs.h | 175 |
1 files changed, 101 insertions, 74 deletions
diff --git a/core/templates/hashfuncs.h b/core/templates/hashfuncs.h index 1330d55270..98ff7fa4ce 100644 --- a/core/templates/hashfuncs.h +++ b/core/templates/hashfuncs.h @@ -56,7 +56,7 @@ * @param C String * @return 32-bits hashcode */ -static inline uint32_t hash_djb2(const char *p_cstr) { +static _FORCE_INLINE_ uint32_t hash_djb2(const char *p_cstr) { const unsigned char *chr = (const unsigned char *)p_cstr; uint32_t hash = 5381; uint32_t c; @@ -68,7 +68,7 @@ static inline uint32_t hash_djb2(const char *p_cstr) { return hash; } -static inline uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len, uint32_t p_prev = 5381) { +static _FORCE_INLINE_ uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len, uint32_t p_prev = 5381) { uint32_t hash = p_prev; for (int i = 0; i < p_len; i++) { @@ -78,7 +78,7 @@ static inline uint32_t hash_djb2_buffer(const uint8_t *p_buff, int p_len, uint32 return hash; } -static inline uint32_t hash_djb2_one_32(uint32_t p_in, uint32_t p_prev = 5381) { +static _FORCE_INLINE_ uint32_t hash_djb2_one_32(uint32_t p_in, uint32_t p_prev = 5381) { return ((p_prev << 5) + p_prev) + p_in; } @@ -89,7 +89,7 @@ static inline uint32_t hash_djb2_one_32(uint32_t p_in, uint32_t p_prev = 5381) { * @param p_int - 64-bit unsigned integer key to be hashed * @return unsigned 32-bit value representing hashcode */ -static inline uint32_t hash_one_uint64(const uint64_t p_int) { +static _FORCE_INLINE_ uint32_t hash_one_uint64(const uint64_t p_int) { uint64_t v = p_int; v = (~v) + (v << 18); // v = (v << 18) - v - 1; v = v ^ (v >> 31); @@ -100,7 +100,72 @@ static inline uint32_t hash_one_uint64(const uint64_t p_int) { return uint32_t(v); } -static inline uint32_t hash_djb2_one_float(double p_in, uint32_t p_prev = 5381) { +// Murmurhash3 32-bit version. +// All MurmurHash versions are public domain software, and the author disclaims all copyright to their code. + +static _FORCE_INLINE_ uint32_t rotl32(uint32_t x, int8_t r) { + return (x << r) | (x >> (32 - r)); +} + +static _FORCE_INLINE_ uint32_t fmix32(uint32_t h) { + h ^= h >> 16; + h *= 0x85ebca6b; + h ^= h >> 13; + h *= 0xc2b2ae35; + h ^= h >> 16; + + return h; +} + +static _FORCE_INLINE_ uint32_t hash_murmur3_32(const void *key, int length, const uint32_t seed = 0x7F07C65) { + // Although not required, this is a random prime number. + const uint8_t *data = (const uint8_t *)key; + const int nblocks = length / 4; + + uint32_t h1 = seed; + + const uint32_t c1 = 0xcc9e2d51; + const uint32_t c2 = 0x1b873593; + + const uint32_t *blocks = (const uint32_t *)(data + nblocks * 4); + + for (int i = -nblocks; i; i++) { + uint32_t k1 = blocks[i]; + + k1 *= c1; + k1 = rotl32(k1, 15); + k1 *= c2; + + h1 ^= k1; + h1 = rotl32(h1, 13); + h1 = h1 * 5 + 0xe6546b64; + } + + const uint8_t *tail = (const uint8_t *)(data + nblocks * 4); + + uint32_t k1 = 0; + + switch (length & 3) { + case 3: + k1 ^= tail[2] << 16; + [[fallthrough]]; + case 2: + k1 ^= tail[1] << 8; + [[fallthrough]]; + case 1: + k1 ^= tail[0]; + k1 *= c1; + k1 = rotl32(k1, 15); + k1 *= c2; + h1 ^= k1; + }; + + // Finalize with additional bit mixing. + h1 ^= length; + return fmix32(h1); +} + +static _FORCE_INLINE_ uint32_t hash_djb2_one_float(double p_in, uint32_t p_prev = 5381) { union { double d; uint64_t i; @@ -119,7 +184,7 @@ static inline uint32_t hash_djb2_one_float(double p_in, uint32_t p_prev = 5381) } template <class T> -static inline uint32_t make_uint32_t(T p_in) { +static _FORCE_INLINE_ uint32_t make_uint32_t(T p_in) { union { T t; uint32_t _u32; @@ -129,7 +194,7 @@ static inline uint32_t make_uint32_t(T p_in) { return _u._u32; } -static inline uint64_t hash_djb2_one_float_64(double p_in, uint64_t p_prev = 5381) { +static _FORCE_INLINE_ uint64_t hash_djb2_one_float_64(double p_in, uint64_t p_prev = 5381) { union { double d; uint64_t i; @@ -147,12 +212,12 @@ static inline uint64_t hash_djb2_one_float_64(double p_in, uint64_t p_prev = 538 return ((p_prev << 5) + p_prev) + u.i; } -static inline uint64_t hash_djb2_one_64(uint64_t p_in, uint64_t p_prev = 5381) { +static _FORCE_INLINE_ uint64_t hash_djb2_one_64(uint64_t p_in, uint64_t p_prev = 5381) { return ((p_prev << 5) + p_prev) + p_in; } template <class T> -static inline uint64_t make_uint64_t(T p_in) { +static _FORCE_INLINE_ uint64_t make_uint64_t(T p_in) { union { T t; uint64_t _u64; @@ -167,78 +232,40 @@ template <class T> class Ref; struct HashMapHasherDefault { - static _FORCE_INLINE_ uint32_t hash(const String &p_string) { return p_string.hash(); } - static _FORCE_INLINE_ uint32_t hash(const char *p_cstr) { return hash_djb2(p_cstr); } - static _FORCE_INLINE_ uint32_t hash(const uint64_t p_int) { return hash_one_uint64(p_int); } - static _FORCE_INLINE_ uint32_t hash(const ObjectID &p_id) { return hash_one_uint64(p_id); } - - static _FORCE_INLINE_ uint32_t hash(const int64_t p_int) { return hash(uint64_t(p_int)); } - static _FORCE_INLINE_ uint32_t hash(const float p_float) { return hash_djb2_one_float(p_float); } - static _FORCE_INLINE_ uint32_t hash(const double p_double) { return hash_djb2_one_float(p_double); } - static _FORCE_INLINE_ uint32_t hash(const uint32_t p_int) { return p_int; } - static _FORCE_INLINE_ uint32_t hash(const int32_t p_int) { return (uint32_t)p_int; } - static _FORCE_INLINE_ uint32_t hash(const uint16_t p_int) { return p_int; } - static _FORCE_INLINE_ uint32_t hash(const int16_t p_int) { return (uint32_t)p_int; } - static _FORCE_INLINE_ uint32_t hash(const uint8_t p_int) { return p_int; } - static _FORCE_INLINE_ uint32_t hash(const int8_t p_int) { return (uint32_t)p_int; } - static _FORCE_INLINE_ uint32_t hash(const wchar_t p_wchar) { return (uint32_t)p_wchar; } - static _FORCE_INLINE_ uint32_t hash(const char16_t p_uchar) { return (uint32_t)p_uchar; } - static _FORCE_INLINE_ uint32_t hash(const char32_t p_uchar) { return (uint32_t)p_uchar; } - static _FORCE_INLINE_ uint32_t hash(const RID &p_rid) { return hash_one_uint64(p_rid.get_id()); } - - static _FORCE_INLINE_ uint32_t hash(const StringName &p_string_name) { return p_string_name.hash(); } - static _FORCE_INLINE_ uint32_t hash(const NodePath &p_path) { return p_path.hash(); } - + // Generic hash function for any type. template <class T> static _FORCE_INLINE_ uint32_t hash(const T *p_pointer) { return hash_one_uint64((uint64_t)p_pointer); } template <class T> static _FORCE_INLINE_ uint32_t hash(const Ref<T> &p_ref) { return hash_one_uint64((uint64_t)p_ref.operator->()); } - static _FORCE_INLINE_ uint32_t hash(const Vector2i &p_vec) { - uint32_t h = hash_djb2_one_32(p_vec.x); - return hash_djb2_one_32(p_vec.y, h); - } - static _FORCE_INLINE_ uint32_t hash(const Vector3i &p_vec) { - uint32_t h = hash_djb2_one_32(p_vec.x); - h = hash_djb2_one_32(p_vec.y, h); - return hash_djb2_one_32(p_vec.z, h); - } - - static _FORCE_INLINE_ uint32_t hash(const Vector2 &p_vec) { - uint32_t h = hash_djb2_one_float(p_vec.x); - return hash_djb2_one_float(p_vec.y, h); - } - static _FORCE_INLINE_ uint32_t hash(const Vector3 &p_vec) { - uint32_t h = hash_djb2_one_float(p_vec.x); - h = hash_djb2_one_float(p_vec.y, h); - return hash_djb2_one_float(p_vec.z, h); - } - - static _FORCE_INLINE_ uint32_t hash(const Rect2i &p_rect) { - uint32_t h = hash_djb2_one_32(p_rect.position.x); - h = hash_djb2_one_32(p_rect.position.y, h); - h = hash_djb2_one_32(p_rect.size.x, h); - return hash_djb2_one_32(p_rect.size.y, h); - } - - static _FORCE_INLINE_ uint32_t hash(const Rect2 &p_rect) { - uint32_t h = hash_djb2_one_float(p_rect.position.x); - h = hash_djb2_one_float(p_rect.position.y, h); - h = hash_djb2_one_float(p_rect.size.x, h); - return hash_djb2_one_float(p_rect.size.y, h); - } - - static _FORCE_INLINE_ uint32_t hash(const AABB &p_aabb) { - uint32_t h = hash_djb2_one_float(p_aabb.position.x); - h = hash_djb2_one_float(p_aabb.position.y, h); - h = hash_djb2_one_float(p_aabb.position.z, h); - h = hash_djb2_one_float(p_aabb.size.x, h); - h = hash_djb2_one_float(p_aabb.size.y, h); - return hash_djb2_one_float(p_aabb.size.z, h); - } + static _FORCE_INLINE_ uint32_t hash(const String &p_string) { return p_string.hash(); } + static _FORCE_INLINE_ uint32_t hash(const char *p_cstr) { return hash_djb2(p_cstr); } + static _FORCE_INLINE_ uint32_t hash(const wchar_t p_wchar) { return fmix32(p_wchar); } + static _FORCE_INLINE_ uint32_t hash(const char16_t p_uchar) { return fmix32(p_uchar); } + static _FORCE_INLINE_ uint32_t hash(const char32_t p_uchar) { return fmix32(p_uchar); } + static _FORCE_INLINE_ uint32_t hash(const RID &p_rid) { return hash_one_uint64(p_rid.get_id()); } + static _FORCE_INLINE_ uint32_t hash(const StringName &p_string_name) { return p_string_name.hash(); } + static _FORCE_INLINE_ uint32_t hash(const NodePath &p_path) { return p_path.hash(); } + static _FORCE_INLINE_ uint32_t hash(const ObjectID &p_id) { return hash_one_uint64(p_id); } - //static _FORCE_INLINE_ uint32_t hash(const void* p_ptr) { return uint32_t(uint64_t(p_ptr))*(0x9e3779b1L); } + static _FORCE_INLINE_ uint32_t hash(const uint64_t p_int) { return hash_one_uint64(p_int); } + static _FORCE_INLINE_ uint32_t hash(const int64_t p_int) { return hash_one_uint64(p_int); } + static _FORCE_INLINE_ uint32_t hash(const float p_float) { return hash_djb2_one_float(p_float); } + static _FORCE_INLINE_ uint32_t hash(const double p_double) { return hash_djb2_one_float(p_double); } + static _FORCE_INLINE_ uint32_t hash(const uint32_t p_int) { return fmix32(p_int); } + static _FORCE_INLINE_ uint32_t hash(const int32_t p_int) { return fmix32(p_int); } + static _FORCE_INLINE_ uint32_t hash(const uint16_t p_int) { return fmix32(p_int); } + static _FORCE_INLINE_ uint32_t hash(const int16_t p_int) { return fmix32(p_int); } + static _FORCE_INLINE_ uint32_t hash(const uint8_t p_int) { return fmix32(p_int); } + static _FORCE_INLINE_ uint32_t hash(const int8_t p_int) { return fmix32(p_int); } + static _FORCE_INLINE_ uint32_t hash(const Vector2i &p_vec) { return hash_murmur3_32(&p_vec, sizeof(Vector2i)); } + static _FORCE_INLINE_ uint32_t hash(const Vector3i &p_vec) { return hash_murmur3_32(&p_vec, sizeof(Vector3i)); } + static _FORCE_INLINE_ uint32_t hash(const Vector2 &p_vec) { return hash_murmur3_32(&p_vec, sizeof(Vector2)); } + static _FORCE_INLINE_ uint32_t hash(const Vector3 &p_vec) { return hash_murmur3_32(&p_vec, sizeof(Vector3)); } + static _FORCE_INLINE_ uint32_t hash(const Rect2i &p_rect) { return hash_murmur3_32(&p_rect, sizeof(Rect2i)); } + static _FORCE_INLINE_ uint32_t hash(const Rect2 &p_rect) { return hash_murmur3_32(&p_rect, sizeof(Rect2)); } + static _FORCE_INLINE_ uint32_t hash(const AABB &p_aabb) { return hash_murmur3_32(&p_aabb, sizeof(AABB)); } }; template <typename T> |