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74 lines
2.9 KiB
74 lines
2.9 KiB
#ifndef Magnum_Swizzle_h |
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#define Magnum_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 /Swizzle.h |
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* @brief Function Magnum::swizzle() |
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*/ |
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#include "Math/Swizzle.h" |
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#include "Color.h" |
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namespace Magnum { |
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#ifndef DOXYGEN_GENERATING_OUTPUT |
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namespace Math { namespace Implementation { |
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template<std::size_t size> struct Component<size, 'r'>: public ComponentAtPosition<size, 0> {}; |
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template<std::size_t size> struct Component<size, 'g'>: public ComponentAtPosition<size, 1> {}; |
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template<std::size_t size> struct Component<size, 'b'>: public ComponentAtPosition<size, 2> {}; |
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template<std::size_t size> struct Component<size, 'a'>: public ComponentAtPosition<size, 3> {}; |
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}} |
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namespace Implementation { |
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template<std::size_t size, class T> struct TypeForSize { |
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typedef Math::Vector<size, typename T::Type> Type; |
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}; |
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template<class T> struct TypeForSize<2, T> { typedef Math::Vector2<typename T::Type> Type; }; |
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template<class T> struct TypeForSize<3, T> { typedef Math::Vector3<typename T::Type> Type; }; |
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template<class T> struct TypeForSize<4, T> { typedef Math::Vector4<typename T::Type> Type; }; |
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template<class T> struct TypeForSize<3, Color3<T>> { typedef Color3<T> Type; }; |
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template<class T> struct TypeForSize<3, Color4<T>> { typedef Color3<T> Type; }; |
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template<class T> struct TypeForSize<4, Color3<T>> { typedef Color4<T> Type; }; |
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template<class T> struct TypeForSize<4, Color4<T>> { typedef Color4<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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Vector4i original(-1, 2, 3, 4); |
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auto vec = swizzle<'a', '1', '0', 'r', 'g', 'b'>(original); |
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// vec == { 4, 1, 0, -1, 2, 3 } |
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@endcode |
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You can use letters `x`, `y`, `z`, `w` and `r`, `g`, `b`, `a` for addressing |
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components or letters `0` and `1` for zero and one. Count of elements is |
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unlimited, but must be at least one. If the resulting vector is two, three or |
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four-component, corresponding Math::Vector2, Math::Vector3, Math::Vector4, |
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Color3 or Color4 specialization is returned. |
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@see @ref matrix-vector-component-access, Math::swizzle(), Vector4::xyz(), |
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Color4::rgb(), Vector4::xy(), Vector3::xy() |
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*/ |
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template<char ...components, class T> inline constexpr typename Implementation::TypeForSize<sizeof...(components), T>::Type swizzle(const T& vector) { |
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return {Math::Implementation::Component<T::Size, components>::value(vector)...}; |
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} |
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} |
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#endif
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