105 lines
1.9 KiB
C++
105 lines
1.9 KiB
C++
#pragma once
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#include <utility>
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template <int R, int C, typename T>
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struct mat;
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//
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// mat4x4
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//
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template <typename T>
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struct mat<2, 2, T>
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{
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typedef vec<2, T> row_type;
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typedef vec<2, T> col_type;
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private:
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row_type value[2];
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public:
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inline constexpr mat();
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inline constexpr mat
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(
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T const& a00, T const& a01,
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T const& a10, T const& a11
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);
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inline static constexpr int length() { return 4; }
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inline constexpr typename mat<2, 2, T>::row_type const &
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operator[](int i) const;
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void operator=(const mat<2, 2, T>&) = delete;
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};
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template<typename T>
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inline constexpr mat<2, 2, T>::mat()
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: value{std::move(row_type(1, 0)),
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std::move(row_type(0, 1))}
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{ }
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template<typename T>
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inline constexpr mat<2, 2, T>::mat
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(
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T const& a00, T const& a01,
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T const& a10, T const& a11
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)
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: value{std::move(row_type(a00, a01)),
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std::move(row_type(a10, a11))}
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{ }
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template <typename T>
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inline constexpr typename mat<2, 2, T>::row_type const &
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mat<2, 2, T>::operator[](int i) const
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{
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switch (i)
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{
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default: [[fallthrough]];
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case 0:
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return value[0];
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case 1:
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return value[1];
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}
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}
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template<typename T>
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inline constexpr mat<2, 2, T> operator*(mat<2, 2, T> const& m1, mat<2, 2, T> const& m2)
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{
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#define c(i, j) ( \
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m1[i][0] * m2[0][j] \
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+ m1[i][1] * m2[1][j])
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return mat<2, 2, T>(c(0,0), c(0,1),
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c(1,0), c(1,1));
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#undef c
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}
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template<typename T>
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inline constexpr typename mat<2, 2, T>::row_type operator*
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(
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mat<2, 2, T> const& m,
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typename mat<2, 2, T>::col_type const& v
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)
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{
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#define c(i) ( \
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m[i][0] * v[0] \
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+ m[i][1] * v[1])
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return typename mat<2, 2, T>::row_type(c(0), c(1));
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#undef c
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}
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template<typename T>
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inline constexpr mat<2, 2, T> transpose(mat<2, 2, T> const& m)
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{
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return mat<2, 2, T>(
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m[0][0], m[1][0],
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m[0][1], m[1][1]
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);
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}
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