81 lines
1.6 KiB
C++
81 lines
1.6 KiB
C++
/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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#pragma once
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/** \file
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* \ingroup bli
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*/
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#include "BLI_math_vector.hh"
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#ifdef WITH_GMP
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# include "BLI_math_mpq.hh"
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namespace blender {
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using mpq2 = VecBase<mpq_class, 2>;
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using mpq3 = VecBase<mpq_class, 3>;
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namespace math {
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uint64_t hash_mpq_class(const mpq_class &value);
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template<> inline uint64_t vector_hash(const mpq2 &vec)
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{
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return hash_mpq_class(vec.x) ^ (hash_mpq_class(vec.y) * 33);
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}
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template<> inline uint64_t vector_hash(const mpq3 &vec)
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{
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return hash_mpq_class(vec.x) ^ (hash_mpq_class(vec.y) * 33) ^ (hash_mpq_class(vec.z) * 33 * 37);
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}
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/**
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* Cannot do this exactly in rational arithmetic!
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* Approximate by going in and out of doubles.
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*/
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template<> inline mpq_class length(const mpq2 &a)
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{
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return mpq_class(sqrt(length_squared(a).get_d()));
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}
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/**
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* Cannot do this exactly in rational arithmetic!
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* Approximate by going in and out of doubles.
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*/
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template<> inline mpq_class length(const mpq3 &a)
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{
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return mpq_class(sqrt(length_squared(a).get_d()));
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}
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/**
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* The buffer avoids allocating a temporary variable.
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*/
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inline mpq_class distance_squared_with_buffer(const mpq3 &a, const mpq3 &b, mpq3 &buffer)
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{
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buffer = a;
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buffer -= b;
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return dot(buffer, buffer);
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}
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/**
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* The buffer avoids allocating a temporary variable.
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*/
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inline mpq_class dot_with_buffer(const mpq3 &a, const mpq3 &b, mpq3 &buffer)
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{
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buffer = a;
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buffer *= b;
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buffer.x += buffer.y;
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buffer.x += buffer.z;
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return buffer.x;
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}
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} // namespace math
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} // namespace blender
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#endif /* WITH_GMP */
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