💿🐜 Antkeeper source code
https://antkeeper.com
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
142 lines
3.2 KiB
142 lines
3.2 KiB
/*
|
|
* Copyright (C) 2021 Christopher J. Howard
|
|
*
|
|
* This file is part of Antkeeper source code.
|
|
*
|
|
* Antkeeper source code is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Antkeeper source code is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef ANTKEEPER_MATH_NOISE_HASH_HPP
|
|
#define ANTKEEPER_MATH_NOISE_HASH_HPP
|
|
|
|
#include "math/vector.hpp"
|
|
#include <cstdint>
|
|
|
|
namespace math {
|
|
namespace noise {
|
|
|
|
/// Hash functions.
|
|
namespace hash {
|
|
|
|
/**
|
|
* PCG3D hash.
|
|
*
|
|
* @see Mark Jarzynski and Marc Olano, Hash Functions for GPU Rendering, Journal of Computer Graphics Techniques (JCGT), vol. 9, no. 3, 21-38, 2020.
|
|
*/
|
|
/// @{
|
|
template <class T>
|
|
math::vector<std::uint32_t, 3> pcg3d_3(const math::vector<T, 3>& x)
|
|
{
|
|
math::vector<std::uint32_t, 3> u = math::vector<std::uint32_t, 3>(x) * 1664525U + 1013904223U;
|
|
|
|
u[0] += u[1] * u[2];
|
|
u[1] += u[2] * u[0];
|
|
u[2] += u[0] * u[1];
|
|
|
|
u[0] ^= u[0] >> 16U;
|
|
u[1] ^= u[1] >> 16U;
|
|
u[2] ^= u[2] >> 16U;
|
|
|
|
u[0] += u[1] * u[2];
|
|
u[1] += u[2] * u[0];
|
|
u[2] += u[0] * u[1];
|
|
|
|
return u;
|
|
}
|
|
|
|
template <class T>
|
|
math::vector<std::uint32_t, 3> pcg3d_3(const math::vector<T, 2>& x)
|
|
{
|
|
return pcg3d_3<T>({x[0], x[1], T{1}});
|
|
}
|
|
|
|
template <class T>
|
|
math::vector<std::uint32_t, 3> pcg3d_3(const math::vector<T, 1>& x)
|
|
{
|
|
return pcg3d_3<T>({x[0], T{1}, T{1}});
|
|
}
|
|
|
|
template <class T>
|
|
math::vector<std::uint32_t, 3> pcg3d_3(T x)
|
|
{
|
|
return pcg3d_3<T>({x, T{1}, T{1}});
|
|
}
|
|
|
|
template <class T>
|
|
std::uint32_t pcg3d_1(const math::vector<T, 3>& x)
|
|
{
|
|
return pcg3d_3<T>(x)[0];
|
|
}
|
|
|
|
template <class T>
|
|
std::uint32_t pcg3d_1(const math::vector<T, 2>& x)
|
|
{
|
|
return pcg3d_3<T>({x[0], x[1], T{1}})[0];
|
|
}
|
|
|
|
template <class T>
|
|
std::uint32_t pcg3d_1(const math::vector<T, 1>& x)
|
|
{
|
|
return pcg3d_3<T>({x[0], T{1}, T{1}})[0];
|
|
}
|
|
|
|
template <class T>
|
|
std::uint32_t pcg3d_1(T x)
|
|
{
|
|
return pcg3d_3<T>({x, T{1}, T{1}})[0];
|
|
}
|
|
/// @}
|
|
|
|
/**
|
|
* PCG4D hash.
|
|
*
|
|
* @see Mark Jarzynski and Marc Olano, Hash Functions for GPU Rendering, Journal of Computer Graphics Techniques (JCGT), vol. 9, no. 3, 21-38, 2020.
|
|
*/
|
|
/// @{
|
|
template <class T>
|
|
math::vector<std::uint32_t, 4> pcg4d_4(const math::vector<T, 4>& x)
|
|
{
|
|
math::vector<std::uint32_t, 4> u = math::vector<std::uint32_t, 4>(x) * 1664525U + 1013904223U;
|
|
|
|
u[0] += u[1] * u[3];
|
|
u[1] += u[2] * u[0];
|
|
u[2] += u[0] * u[1];
|
|
u[3] += u[1] * u[2];
|
|
|
|
u[0] ^= u[0] >> 16U;
|
|
u[1] ^= u[1] >> 16U;
|
|
u[2] ^= u[2] >> 16U;
|
|
u[3] ^= u[3] >> 16U;
|
|
|
|
u[0] += u[1] * u[3];
|
|
u[1] += u[2] * u[0];
|
|
u[2] += u[0] * u[1];
|
|
u[3] += u[1] * u[2];
|
|
|
|
return u;
|
|
}
|
|
|
|
template <class T>
|
|
std::uint32_t pcg4d_1(const math::vector<T, 4>& x)
|
|
{
|
|
return pcg4d_4<T>(x)[0];
|
|
}
|
|
/// @}
|
|
|
|
} // namespace hash
|
|
|
|
} // namespace noise
|
|
} // namespace math
|
|
|
|
#endif // ANTKEEPER_MATH_NOISE_HASH_HPP
|