mirror of https://github.com/mosra/magnum.git
Vladimír Vondruš
14 years ago
13 changed files with 330 additions and 7 deletions
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#ifndef Magnum_Math_Swizzle_h |
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#define Magnum_Math_Swizzle_h |
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/*
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Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz> |
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This file is part of Magnum. |
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Magnum is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License version 3 |
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only, as published by the Free Software Foundation. |
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Magnum 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 Lesser General Public License version 3 for more details. |
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*/ |
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/** @file
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* @brief Function Magnum::Math::swizzle() |
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*/ |
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#include "Vector4.h" |
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namespace Magnum { namespace Math { |
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#ifndef DOXYGEN_GENERATING_OUTPUT |
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namespace Implementation { |
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template<size_t size, size_t position> struct GetPosition { |
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static_assert(size > position, "Swizzle parameter out of range of base vector"); |
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inline constexpr static size_t value() { return position; } |
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}; |
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template<size_t size, char component> struct GetComponent {}; |
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template<size_t size> struct GetComponent<size, 'x'>: public GetPosition<size, 0> {}; |
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template<size_t size> struct GetComponent<size, 'y'>: public GetPosition<size, 1> {}; |
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template<size_t size> struct GetComponent<size, 'z'>: public GetPosition<size, 2> {}; |
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template<size_t size> struct GetComponent<size, 'w'>: public GetPosition<size, 3> {}; |
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template<size_t size> struct GetComponent<size, 'r'>: public GetPosition<size, 0> {}; |
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template<size_t size> struct GetComponent<size, 'g'>: public GetPosition<size, 1> {}; |
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template<size_t size> struct GetComponent<size, 'b'>: public GetPosition<size, 2> {}; |
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template<size_t size> struct GetComponent<size, 'a'>: public GetPosition<size, 3> {}; |
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template<size_t size, class T> struct TypeForSize { |
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typedef Vector<size, T> Type; |
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}; |
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template<class T> struct TypeForSize<2, T> { typedef Vector2<T> Type; }; |
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template<class T> struct TypeForSize<3, T> { typedef Vector3<T> Type; }; |
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template<class T> struct TypeForSize<4, T> { typedef Vector4<T> Type; }; |
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} |
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#endif |
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/**
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@brief Swizzle Vector components |
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Creates new vector from given components. Example: |
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@code |
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Vector4<int> original(1, 2, 3, 4); |
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auto vec = swizzle<'a', 'b', 'b', 'g', 'r', 'r'>(original); |
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// vec == { 4, 3, 3, 2, 1, 1 }
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@endcode |
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You can use letters `x`, `y`, `z`, `w` and `r`, `g`, `b`, `a`. Count of |
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elements is unlimited, but must be at least one. If the resulting vector is |
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two, three or four-component, corresponding Vector2, Vector3 or Vector4 |
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specialization is returned. |
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@see Vector4::xyz(), Vector4::rgb(), Vector4::xy(), Vector3::xy() |
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*/ |
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template<char ...components, size_t size, class T> inline constexpr typename Implementation::TypeForSize<sizeof...(components), T>::Type swizzle(const Vector<size, T>& vector) { |
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return {vector[Implementation::GetComponent<size, components>::value()]...}; |
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} |
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}} |
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#endif |
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/*
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Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz> |
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This file is part of Magnum. |
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|
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Magnum is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License version 3 |
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only, as published by the Free Software Foundation. |
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|
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Magnum 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 Lesser General Public License version 3 for more details. |
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*/ |
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#include "SwizzleTest.h" |
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#include "Swizzle.h" |
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using namespace std; |
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CORRADE_TEST_MAIN(Magnum::Math::Test::SwizzleTest) |
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namespace Magnum { namespace Math { namespace Test { |
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typedef Math::Vector2<int> Vector2; |
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typedef Math::Vector3<int> Vector3; |
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typedef Math::Vector4<int> Vector4; |
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template<size_t size> using Vector = Math::Vector<size, int>; |
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SwizzleTest::SwizzleTest() { |
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addTests(&SwizzleTest::xyzw, |
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&SwizzleTest::rgba, |
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&SwizzleTest::type, |
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&SwizzleTest::defaultType); |
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} |
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void SwizzleTest::xyzw() { |
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Vector4 orig(2, 4, 5, 7); |
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CORRADE_COMPARE((swizzle<'z', 'x', 'w', 'y'>(orig)), Vector4(5, 2, 7, 4)); |
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} |
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void SwizzleTest::rgba() { |
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Vector4 orig(2, 4, 5, 7); |
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CORRADE_COMPARE((swizzle<'b', 'r', 'a', 'g'>(orig)), Vector4(5, 2, 7, 4)); |
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} |
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void SwizzleTest::type() { |
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Vector4 orig; |
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CORRADE_VERIFY((is_same<decltype(swizzle<'y', 'a'>(orig)), Vector2>::value)); |
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CORRADE_VERIFY((is_same<decltype(swizzle<'y', 'z', 'a'>(orig)), Vector3>::value)); |
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CORRADE_VERIFY((is_same<decltype(swizzle<'y', 'a', 'y', 'x'>(orig)), Vector4>::value)); |
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} |
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void SwizzleTest::defaultType() { |
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Vector4 orig(1, 2, 3, 4); |
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CORRADE_COMPARE(swizzle<'b'>(orig), Vector<1>(3)); |
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CORRADE_COMPARE((swizzle<'b', 'r', 'a', 'g', 'z', 'y', 'x'>(orig)), Vector<7>(3, 1, 4, 2, 3, 2, 1)); |
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} |
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}}} |
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#ifndef Magnum_Math_Test_SwizzleTest_h |
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#define Magnum_Math_Test_SwizzleTest_h |
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/*
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Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz> |
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This file is part of Magnum. |
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|
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Magnum is free software: you can redistribute it and/or modify |
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it under the terms of the GNU Lesser General Public License version 3 |
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only, as published by the Free Software Foundation. |
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|
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Magnum 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 Lesser General Public License version 3 for more details. |
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*/ |
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#include <TestSuite/Tester.h> |
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namespace Magnum { namespace Math { namespace Test { |
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class SwizzleTest: public Corrade::TestSuite::Tester<SwizzleTest> { |
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public: |
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SwizzleTest(); |
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void xyzw(); |
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void rgba(); |
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void type(); |
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void defaultType(); |
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}; |
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}}} |
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#endif |
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