libcruft-util/geom/ray.cpp

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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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*
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* Copyright 2015-2018 Danny Robson <danny@nerdcruft.net>
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*/
#include "ray.hpp"
#include "iostream.hpp"
#include "ops.hpp"
#include "../coord/iostream.hpp"
#include "../debug.hpp"
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using util::geom::ray;
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///////////////////////////////////////////////////////////////////////////////
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/// returns the closest parameter along the ray to a given point
template <size_t S, typename T>
T
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ray<S,T>::closest (point<S,T> q) const
{
// project the origin-point difference onto the direction
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return dot (origin - q, direction);
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}
//-----------------------------------------------------------------------------
template <size_t S, typename T>
util::point<S,T>
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ray<S,T>::at (T t) const
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{
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return origin + direction * t;
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}
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///////////////////////////////////////////////////////////////////////////////
util::geom::ray3f
util::geom::operator* (util::matrix4f lhs, ray3f rhs)
{
return {
(lhs * rhs.origin.homog<4> ()).redim<3> (),
normalised (
(lhs * rhs.direction.homog<4> ()).redim<3> ()
)
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};
}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
std::ostream&
util::geom::operator<< (std::ostream &os, ray<S,T> r)
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{
return os << "ray(" << r.origin << ',' << r.direction << ')';
}
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///////////////////////////////////////////////////////////////////////////////
template <size_t S, typename T>
struct util::debug::validator<ray<S,T>> {
static bool
is_valid (ray<S,T> const& val)
{
return util::debug::is_valid (val.origin) &&
util::debug::is_valid (val.direction) &&
is_normalised (val.direction);
}
};
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///////////////////////////////////////////////////////////////////////////////
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#define INSTANTIATE_S_T(S,T) \
template std::ostream& util::geom::operator<< (std::ostream&, ray<S,T>); \
template struct util::debug::validator<ray<S,T>>; \
template struct util::geom::ray<S,T>;
INSTANTIATE_S_T(2,float)
INSTANTIATE_S_T(3,float)