Signed-off-by: myperworld <myperworld@126.com>
This commit is contained in:
myperworld committed
1 parent
0986832fd1
commit
aacd052c06
3403 files changed
+597376
-12
No files matched your search
@@ -0,0 +1,264 @@
|
||||
#pragma once
|
||||
|
||||
#include "fl/str.h"
|
||||
#include "fl/type_traits.h"
|
||||
#include "fl/int.h"
|
||||
#include "fl/stdint.h"
|
||||
#include "fl/force_inline.h"
|
||||
#include "fl/memfill.h"
|
||||
#include <string.h>
|
||||
#include "fl/compiler_control.h"
|
||||
|
||||
namespace fl {
|
||||
|
||||
template <typename T> struct vec2;
|
||||
|
||||
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
// MurmurHash3 x86 32-bit
|
||||
//-----------------------------------------------------------------------------
|
||||
// Based on the public‐domain implementation by Austin Appleby:
|
||||
// https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp
|
||||
static inline u32 MurmurHash3_x86_32(const void *key, fl::size len,
|
||||
u32 seed = 0) {
|
||||
|
||||
FL_DISABLE_WARNING_PUSH;
|
||||
FL_DISABLE_WARNING_IMPLICIT_FALLTHROUGH;
|
||||
|
||||
const fl::u8 *data = static_cast<const fl::u8 *>(key);
|
||||
const int nblocks = int(len / 4);
|
||||
|
||||
u32 h1 = seed;
|
||||
const u32 c1 = 0xcc9e2d51;
|
||||
const u32 c2 = 0x1b873593;
|
||||
|
||||
// body
|
||||
const u32 *blocks = reinterpret_cast<const u32 *>(data);
|
||||
for (int i = 0; i < nblocks; ++i) {
|
||||
u32 k1 = blocks[i];
|
||||
k1 *= c1;
|
||||
k1 = (k1 << 15) | (k1 >> 17);
|
||||
k1 *= c2;
|
||||
|
||||
h1 ^= k1;
|
||||
h1 = (h1 << 13) | (h1 >> 19);
|
||||
h1 = h1 * 5 + 0xe6546b64;
|
||||
}
|
||||
|
||||
// tail
|
||||
const fl::u8 *tail = data + (nblocks * 4);
|
||||
u32 k1 = 0;
|
||||
switch (len & 3) {
|
||||
case 3:
|
||||
k1 ^= u32(tail[2]) << 16;
|
||||
case 2:
|
||||
k1 ^= u32(tail[1]) << 8;
|
||||
case 1:
|
||||
k1 ^= u32(tail[0]);
|
||||
k1 *= c1;
|
||||
k1 = (k1 << 15) | (k1 >> 17);
|
||||
k1 *= c2;
|
||||
h1 ^= k1;
|
||||
}
|
||||
|
||||
// finalization
|
||||
h1 ^= u32(len);
|
||||
// fmix32
|
||||
h1 ^= h1 >> 16;
|
||||
h1 *= 0x85ebca6b;
|
||||
h1 ^= h1 >> 13;
|
||||
h1 *= 0xc2b2ae35;
|
||||
h1 ^= h1 >> 16;
|
||||
|
||||
return h1;
|
||||
|
||||
FL_DISABLE_WARNING_POP;
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
// Fast, cheap 32-bit integer hash (Thomas Wang)
|
||||
//-----------------------------------------------------------------------------
|
||||
static inline u32 fast_hash32(u32 x) noexcept {
|
||||
x = (x ^ 61u) ^ (x >> 16);
|
||||
x = x + (x << 3);
|
||||
x = x ^ (x >> 4);
|
||||
x = x * 0x27d4eb2dU;
|
||||
x = x ^ (x >> 15);
|
||||
return x;
|
||||
}
|
||||
|
||||
// 3) Handy two-word hasher
|
||||
static inline u32 hash_pair(u32 a, u32 b,
|
||||
u32 seed = 0) noexcept {
|
||||
// mix in 'a', then mix in 'b'
|
||||
u32 h = fast_hash32(seed ^ a);
|
||||
return fast_hash32(h ^ b);
|
||||
}
|
||||
|
||||
static inline u32 fast_hash64(u64 x) noexcept {
|
||||
u32 x1 = static_cast<u32>(x & 0x00000000FFFFFFFF);
|
||||
u32 x2 = static_cast<u32>(x >> 32);
|
||||
return hash_pair(x1, x2);
|
||||
}
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
// Functor for hashing arbitrary byte‐ranges to a 32‐bit value
|
||||
//-----------------------------------------------------------------------------
|
||||
// https://github.com/aappleby/smhasher/blob/master/src/MurmurHash3.cpp
|
||||
template <typename T> struct Hash {
|
||||
static_assert(fl::is_pod<T>::value,
|
||||
"fl::Hash<T> only supports POD types (integrals, floats, "
|
||||
"etc.), you need to define your own hash.");
|
||||
u32 operator()(const T &key) const noexcept {
|
||||
return MurmurHash3_x86_32(&key, sizeof(T));
|
||||
}
|
||||
};
|
||||
|
||||
template <typename T> struct FastHash {
|
||||
static_assert(fl::is_pod<T>::value,
|
||||
"fl::FastHash<T> only supports POD types (integrals, floats, "
|
||||
"etc.), you need to define your own hash.");
|
||||
u32 operator()(const T &key) const noexcept {
|
||||
return fast_hash32(key);
|
||||
}
|
||||
};
|
||||
|
||||
template <typename T> struct FastHash<vec2<T>> {
|
||||
u32 operator()(const vec2<T> &key) const noexcept {
|
||||
if (sizeof(T) == sizeof(fl::u8)) {
|
||||
u32 x = static_cast<u32>(key.x) +
|
||||
(static_cast<u32>(key.y) << 8);
|
||||
return fast_hash32(x);
|
||||
}
|
||||
if (sizeof(T) == sizeof(u16)) {
|
||||
u32 x = static_cast<u32>(key.x) +
|
||||
(static_cast<u32>(key.y) << 16);
|
||||
return fast_hash32(x);
|
||||
}
|
||||
if (sizeof(T) == sizeof(u32)) {
|
||||
return hash_pair(key.x, key.y);
|
||||
}
|
||||
return MurmurHash3_x86_32(&key, sizeof(T));
|
||||
}
|
||||
};
|
||||
|
||||
template <typename T> struct Hash<T *> {
|
||||
u32 operator()(T *key) const noexcept {
|
||||
if (sizeof(T *) == sizeof(u32)) {
|
||||
u32 key_u = reinterpret_cast<fl::uptr>(key);
|
||||
return fast_hash32(key_u);
|
||||
} else {
|
||||
return MurmurHash3_x86_32(key, sizeof(T *));
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
template <typename T> struct Hash<vec2<T>> {
|
||||
u32 operator()(const vec2<T> &key) const noexcept {
|
||||
#ifndef __clang__
|
||||
#pragma GCC diagnostic push
|
||||
#pragma GCC diagnostic ignored "-Wmaybe-uninitialized"
|
||||
#endif
|
||||
T packed[2] = {key.x, key.y};
|
||||
const void *p = &packed[0];
|
||||
return MurmurHash3_x86_32(p, sizeof(packed));
|
||||
#ifndef __clang__
|
||||
#pragma GCC diagnostic pop
|
||||
#endif
|
||||
}
|
||||
};
|
||||
|
||||
template <typename T> struct Hash<fl::shared_ptr<T>> {
|
||||
u32 operator()(const T &key) const noexcept {
|
||||
auto hasher = Hash<T *>();
|
||||
return hasher(key.get());
|
||||
}
|
||||
};
|
||||
|
||||
template <typename T> struct Hash<fl::WeakPtr<T>> {
|
||||
u32 operator()(const fl::WeakPtr<T> &key) const noexcept {
|
||||
fl::uptr val = key.ptr_value();
|
||||
return MurmurHash3_x86_32(&val, sizeof(fl::uptr));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<float> {
|
||||
u32 operator()(const float key) const noexcept {
|
||||
u32 ikey = fl::bit_cast<u32>(key);
|
||||
return fast_hash32(ikey);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<double> {
|
||||
u32 operator()(const double& key) const noexcept {
|
||||
return MurmurHash3_x86_32(&key, sizeof(double));
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<i32> {
|
||||
u32 operator()(const i32 key) const noexcept {
|
||||
u32 ukey = static_cast<u32>(key);
|
||||
return fast_hash32(ukey);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<bool> {
|
||||
u32 operator()(const bool key) const noexcept {
|
||||
return fast_hash32(key);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<fl::u8> {
|
||||
u32 operator()(const fl::u8 &key) const noexcept {
|
||||
return fast_hash32(key);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<u16> {
|
||||
u32 operator()(const u16 &key) const noexcept {
|
||||
return fast_hash32(key);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<u32> {
|
||||
u32 operator()(const u32 &key) const noexcept {
|
||||
return fast_hash32(key);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<i8> {
|
||||
u32 operator()(const i8 &key) const noexcept {
|
||||
u8 v = static_cast<u8>(key);
|
||||
return fast_hash32(v);
|
||||
}
|
||||
};
|
||||
|
||||
template<> struct Hash<i16> {
|
||||
u32 operator()(const i16 &key) const noexcept {
|
||||
u16 ukey = static_cast<u16>(key);
|
||||
return fast_hash32(ukey);
|
||||
}
|
||||
};
|
||||
|
||||
// FASTLED_DEFINE_FAST_HASH(fl::u8)
|
||||
// FASTLED_DEFINE_FAST_HASH(u16)
|
||||
// FASTLED_DEFINE_FAST_HASH(u32)
|
||||
// FASTLED_DEFINE_FAST_HASH(i8)
|
||||
// FASTLED_DEFINE_FAST_HASH(i16)
|
||||
// FASTLED_DEFINE_FAST_HASH(bool)
|
||||
|
||||
// FASTLED_DEFINE_FAST_HASH(int)
|
||||
|
||||
//-----------------------------------------------------------------------------
|
||||
// Convenience for std::string → u32
|
||||
//----------------------------------------------------------------------------
|
||||
template <> struct Hash<fl::string> {
|
||||
u32 operator()(const fl::string &key) const noexcept {
|
||||
return MurmurHash3_x86_32(key.data(), key.size());
|
||||
}
|
||||
};
|
||||
|
||||
|
||||
|
||||
} // namespace fl
|
||||
Reference in new issue
Block a user