libcruft-util/geom/ray.hpp

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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
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*
* Copyright 2015 Danny Robson <danny@nerdcruft.net>
*/
#ifndef __UTIL_GEOM_RAY_HPP
#define __UTIL_GEOM_RAY_HPP
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#include "aabb.hpp"
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#include "plane.hpp"
#include "sphere.hpp"
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#include "../vector.hpp"
#include "../point.hpp"
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///////////////////////////////////////////////////////////////////////////////
namespace util::geom {
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template <size_t S, typename T>
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struct ray {
constexpr ray () = default;
constexpr ray (point<S,T> _origin, vector<S,T> _direction) noexcept:
origin (_origin),
direction (_direction)
{
CHECK (is_normalised (direction));
}
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constexpr ray (point<S,T> _origin, point <S,T> _distant) noexcept:
ray (_origin, _origin.to (_distant ))
{
CHECK (is_normalised (direction));
}
//---------------------------------------------------------------------
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// intersection tests
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T intersect (plane<S,T>) const;
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T intersect (aabb<S,T>) const;
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T intersect (sphere<S,T>) const;
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// queries
T closest (point<S,T>) const;
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util::point<S,T> at (T) const;
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// data members
point<S,T> origin;
vector<S,T> direction;
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};
template <std::size_t S, typename T>
constexpr auto
make_ray (point<S,T> p, vector<S,T> d) noexcept
{
return ray<S,T> { p, d };
}
template <std::size_t S, typename T>
constexpr auto
make_ray (point<S,T> p, point<S,T> q)
{
return ray<S,T> { p, q };
};
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typedef ray<2,float> ray2f;
typedef ray<3,float> ray3f;
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}
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#endif