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102 lines
3.4 KiB
102 lines
3.4 KiB
10 years ago
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#ifndef Magnum_Math_Frustum_h
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#define Magnum_Math_Frustum_h
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/*
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This file is part of Magnum.
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Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016
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Vladimír Vondruš <mosra@centrum.cz>
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Copyright © 2016 Jonathan Hale <squareys@googlemail.com>
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Permission is hereby granted, free of charge, to any person obtaining a
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copy of this software and associated documentation files (the "Software"),
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to deal in the Software without restriction, including without limitation
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the rights to use, copy, modify, merge, publish, distribute, sublicense,
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and/or sell copies of the Software, and to permit persons to whom the
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Software is furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included
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in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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*/
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/** @file
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* @brief Class @ref Magnum::Math::Frustum
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*/
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#include <Corrade/configure.h>
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#include <Corrade/Containers/ArrayView.h>
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#include <Corrade/Utility/Debug.h>
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#include "Magnum/Math/Matrix4.h"
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#include "Magnum/Math/Vector4.h"
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namespace Magnum { namespace Math {
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/**
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@brief Camera frustum
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*/
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template<class T> class Frustum {
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public:
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/**
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* @brief Create a frustum from projection matrix
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*/
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static Frustum<T> fromMatrix(const Matrix4<T>& m) {
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return Frustum{
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m.row(3) + m.row(0),
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m.row(3) - m.row(0),
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m.row(3) + m.row(1),
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m.row(3) - m.row(1),
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m.row(3) + m.row(2),
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m.row(3) - m.row(2)
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};
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}
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/**
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* @brief Construct frustum from frustum planes
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*/
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constexpr /*implicit*/ Frustum(const Vector4<T>& left, const Vector4<T>& right, const Vector4<T>& bottom, const Vector4<T>& top, const Vector4<T>& near, const Vector4<T>& far): _data{left, right, bottom, top, near, far} {}
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/**
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* @brief Raw data
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* @return One-dimensional array of length `24`.
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*/
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T* data() { return _data[0].data(); }
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/** @overload */
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constexpr const T* data() const { return _data[0].data(); }
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/**
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* @brief The frustum planes
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*
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* In order left (index `0`), right (index `1`), bottom (index `1`),
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* top (index `3`), near (index `4`), far (index `5`).
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*/
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constexpr Corrade::Containers::StaticArrayView<6, const Vector4<T>> planes() const {
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return Corrade::Containers::StaticArrayView<6, const Vector4<T>>{_data};
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}
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/**
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* @brief Plane at given index
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*
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* In order left (index `0`), right (index `1`), bottom (index `1`),
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* top (index `3`), near (index `4`), far (index `5`).
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*/
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constexpr Vector4<T> operator[](std::size_t i) const { return _data[i]; }
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private:
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Vector4<T> _data[6];
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};
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}}
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#endif
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