Medusa Slockbower
73333b4c67
- Implemented Basic Platform Interfaces
- Implemented partial Linux platform and Wayland Display.
- Implemented Dependencies for the above
- map
- set
- optional
- pair
TODO: threading
90 lines
2.4 KiB
C++
90 lines
2.4 KiB
C++
// =====================================================================================================================
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// fennec, a free and open source game engine
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// Copyright © 2025 Medusa Slockbower
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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// =====================================================================================================================
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#ifndef FENNEC_LANG_HASHING_H
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#define FENNEC_LANG_HASHING_H
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#include <fennec/lang/types.h>
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#include <fennec/lang/type_traits.h>
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namespace fennec
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{
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///
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/// \brief Struct for hashing types, there is no default hashing function
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/// \tparam Key The type to hash
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template<typename Key> struct hash;
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// Murmur3 Hash for 64-bit ints
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template<>
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struct hash<uint64_t> {
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using type_t = uint64_t;
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constexpr size_t operator()(uint64_t x) const {
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// Murmur3
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x ^= x >> 33U;
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x *= 0xff51afd7ed558ccd;
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x ^= x >> 33U;
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x *= 0xc4ceb9fe1a85ec53;
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x ^= x >> 33U;
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return x;
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}
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};
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// Wrapper for casting ints
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template<typename IntT>
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requires is_integral_v<IntT>
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struct hash<IntT> : hash<uint64_t> {
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using type_t = IntT;
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};
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// Wrapper for pointers
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template<typename PtrT>
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requires is_pointer_v<PtrT>
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struct hash<PtrT> : hash<uintptr_t> {
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};
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// Float
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template<>
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struct hash<float> : hash<uint32_t> {
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constexpr size_t operator()(float x) const {
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return hash<uint32_t>::operator()(bit_cast<uint32_t>(x));
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}
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};
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template<>
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struct hash<double> : hash<uint64_t> {
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constexpr size_t operator()(double x) const {
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return hash<uint64_t>::operator()(bit_cast<uint64_t>(x));
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}
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};
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///
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/// \brief Pairs two hashes
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/// \param x first hash
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/// \param y second hash
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/// \returns a pairing of the two hashes
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constexpr size_t pair_hash(size_t x, size_t y) {
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// Szudzik Pairing
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return (x >= y ? (x * x) + x + y : (y * y) + x);
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}
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}
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#endif // FENNEC_LANG_HASHING_H
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