kopia lustrzana https://github.com/jameshball/osci-render
51 wiersze
1.4 KiB
C++
51 wiersze
1.4 KiB
C++
// L=============================================================================
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// L This software is distributed under the MIT license.
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// L Copyright 2021 Péter Kardos
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// L=============================================================================
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#pragma once
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#include "../Matrix/MatrixImpl.hpp"
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#include "../Quaternion/QuaternionImpl.hpp"
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#include "ZeroBuilder.hpp"
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namespace mathter {
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class IdentityBuilder {
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public:
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IdentityBuilder() = default;
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IdentityBuilder& operator=(const IdentityBuilder&) = delete;
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template <class T, int Rows, int Columns, eMatrixOrder Order, eMatrixLayout Layout, bool Packed>
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operator Matrix<T, Rows, Columns, Order, Layout, Packed>() const {
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Matrix<T, Rows, Columns, Order, Layout, Packed> m;
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Set(m);
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return m;
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}
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template <class T, bool Packed>
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operator Quaternion<T, Packed>() const {
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return Quaternion<T, Packed>{ 1, 0, 0, 0 };
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}
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private:
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template <class T, int Rows, int Columns, eMatrixOrder Order, eMatrixLayout Layout, bool Packed>
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void Set(Matrix<T, Rows, Columns, Order, Layout, Packed>& m) const {
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m = Zero();
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for (int i = 0; i < std::min(Rows, Columns); ++i) {
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m(i, i) = T(1);
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}
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}
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};
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/// <summary> Creates an identity matrix or identity quaternion. </summary>
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/// <remarks> If the matrix is not square, it will look like a truncated larger square identity matrix. </remarks>
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inline auto Identity() {
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return IdentityBuilder{};
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}
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} // namespace mathter
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