Danny Robson
c4eec456a0
we need to create vectors of zeros pretty often and it's pretty verbose having to continually use the full type name each time.
254 lines
8.6 KiB
C++
254 lines
8.6 KiB
C++
/*
|
|
* 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
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* 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.
|
|
*
|
|
* Copyright 2012-2017 Danny Robson <danny@nerdcruft.net>
|
|
*/
|
|
|
|
#ifndef CRUFT_UTIL_COORD_BASE_HPP
|
|
#define CRUFT_UTIL_COORD_BASE_HPP
|
|
|
|
#include "fwd.hpp"
|
|
|
|
#include "ops.hpp"
|
|
#include "init.hpp"
|
|
#include "traits.hpp"
|
|
#include "../maths.hpp"
|
|
|
|
#include <algorithm>
|
|
#include <cstdlib>
|
|
#include <type_traits>
|
|
|
|
|
|
namespace util::coord {
|
|
/////////////////////////////////////////////////////////////////////////
|
|
// the base class for all coordinate-like types.
|
|
//
|
|
// SelfT should not be exposed as a template template directly because
|
|
// some types (eg, XYZ colours) do not conform to the same template
|
|
// parameters are others (eg, vector2f). ie, it does not make sense to
|
|
// allow redim, or type changing on some types so they just aren't exposed.
|
|
template <
|
|
std::size_t S,
|
|
typename T,
|
|
typename SelfT
|
|
>
|
|
struct base : public init<S,T,SelfT> {
|
|
static_assert (S > 0);
|
|
static_assert (std::is_arithmetic<T>::value);
|
|
static_assert (sizeof (init<S,T,SelfT>) == S * sizeof (T));
|
|
|
|
using self_t = SelfT;
|
|
using value_type = T;
|
|
static constexpr std::size_t dimension = S;
|
|
static constexpr std::size_t elements = S;
|
|
|
|
/// returns the number of elements we contain
|
|
static constexpr auto size (void) { return S; }
|
|
|
|
// constructors
|
|
using init<S,T,SelfT>::init;
|
|
|
|
/// constructs, but does not initialise, the data.
|
|
///
|
|
/// used to avoid unnecessary initialisation in many situations where
|
|
/// we have arrays of these types that are about to be overwritten. it
|
|
/// is a very important performance optimisation.
|
|
base () = default;
|
|
|
|
/// constructs an instance where all elements are initialised to `val'.
|
|
constexpr
|
|
base (T fill)
|
|
{
|
|
for (decltype(S) i = 0; i < S; ++i)
|
|
this->data[i] = fill;
|
|
}
|
|
|
|
constexpr base (const base<S,T,SelfT> &rhs) = default;
|
|
base& operator= (const base<S,T,SelfT> &rhs)& = default;
|
|
base& operator= (const T t)&
|
|
{
|
|
for (auto &v: *this)
|
|
v = t;
|
|
return *this;
|
|
}
|
|
|
|
// element accessors
|
|
constexpr T& operator[] (size_t i)& noexcept { return this->data[i]; }
|
|
constexpr T& operator[] (int i)& noexcept { return this->data[i]; }
|
|
|
|
constexpr const T& operator[] (size_t i) const& noexcept { return this->data[i]; }
|
|
constexpr const T& operator[] (int i) const& noexcept { return this->data[i]; }
|
|
|
|
auto cbegin (void) const { return std::cbegin (this->data); }
|
|
auto cend (void) const { return std::cend (this->data); }
|
|
|
|
auto begin (void) const { return std::begin (this->data); }
|
|
auto end (void) const { return std::end (this->data); }
|
|
|
|
auto begin (void) { return std::begin (this->data); }
|
|
auto end (void) { return std::end (this->data); }
|
|
|
|
const T& front (void) const { return this->data[0]; }
|
|
T& front (void) { return this->data[0]; }
|
|
|
|
const T& back (void) const { return this->data[S-1]; }
|
|
T& back (void) { return this->data[S-1]; }
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
// conversions
|
|
template <template <std::size_t, typename> class K>
|
|
K<S,T> as (void) const
|
|
{
|
|
K<S,T> k;
|
|
std::copy (begin (), end (), k.begin ());
|
|
return k;
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
template <
|
|
typename K,
|
|
typename = std::enable_if_t<is_coord_v<K>,void>
|
|
>
|
|
K as (void) const
|
|
{
|
|
static_assert (K::elements == elements);
|
|
K k;
|
|
std::copy (begin (), end (), k.begin ());
|
|
return k;
|
|
}
|
|
|
|
|
|
//---------------------------------
|
|
template <typename U>
|
|
auto
|
|
cast (void) const
|
|
{
|
|
typename revalue_type<SelfT>::template type<U> out;
|
|
|
|
std::copy (std::cbegin (this->data),
|
|
std::cend (this->data),
|
|
std::begin (out.data));
|
|
return out;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
/// returns an instance with the same data, but truncated to `D'
|
|
/// elements
|
|
///
|
|
/// explicitly does not allow a fill parameter given it can't be used
|
|
/// when reducing dimensions.
|
|
///
|
|
/// HACK,gcc#,gcc-7.x: This function _must not_ use std::copy or
|
|
/// similar algorithms to move the data as it produces an ICE on some
|
|
/// code fragements if it does. Namely:
|
|
/// "internal compiler error: in trunc_int_for_mode, at explow.c:55"
|
|
template <
|
|
size_t D,
|
|
typename = std::enable_if_t<
|
|
has_redim_v<SelfT> && S >= D,
|
|
void
|
|
>
|
|
>
|
|
auto
|
|
redim (void) const
|
|
{
|
|
redim_t<SelfT,D> out;
|
|
for (size_t i = 0; i < D; ++i)
|
|
out[i] = this->data[i];
|
|
return out;
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------
|
|
/// returns an instance with the same data, but more elements, where
|
|
/// the new elements are initialised with values with the same index
|
|
/// in the coordinate `fill'.
|
|
///
|
|
/// explicitly requires a fill parameter so that we avoid undefined
|
|
/// values.
|
|
///
|
|
/// HACK,gcc#,gcc-7.x: This function _must not_ use std::copy or
|
|
/// similar algorithms to move the data as it produces an ICE on some
|
|
/// code fragements if it does. Namely:
|
|
/// "internal compiler error: in trunc_int_for_mode, at explow.c:55"
|
|
template<size_t D,typename _sfinae = SelfT>
|
|
std::enable_if_t<
|
|
has_redim_v<_sfinae> && S <= D,
|
|
redim_t<_sfinae,D>
|
|
>
|
|
redim (const redim_t<_sfinae,D> fill) const
|
|
{
|
|
redim_t<SelfT,D> out;
|
|
|
|
for (size_t i = 0; i < S; ++i)
|
|
out[i] = this->data[i];
|
|
for (size_t i = S; i < D; ++i)
|
|
out[i] = fill[i];
|
|
return out;
|
|
}
|
|
|
|
//---------------------------------------------------------------------
|
|
/// returns an instance with the same data, but more elements, where
|
|
/// all the new elemenst are initialised with the scalar `fill'.
|
|
///
|
|
/// explicitly requires a fill parameter so that we avoid undefined
|
|
/// values.
|
|
///
|
|
/// HACK,gcc#,gcc-7.x: This function _must not_ use std::copy or
|
|
/// similar algorithms to move the data as it produces an ICE on some
|
|
/// code fragements if it does. Namely:
|
|
/// "internal compiler error: in trunc_int_for_mode, at explow.c:55"
|
|
template <
|
|
size_t D,
|
|
typename _sfinae = SelfT
|
|
>
|
|
std::enable_if_t<
|
|
has_redim_v<_sfinae> && S <= D,
|
|
redim_t<_sfinae,D>
|
|
>
|
|
redim (T fill) const
|
|
{
|
|
redim_t<SelfT,D> out;
|
|
for (size_t i = 0; i < S; ++i)
|
|
out[i] = this->data[i];
|
|
for (size_t i = S; i < D; ++i)
|
|
out[i] = fill;
|
|
return out;
|
|
}
|
|
|
|
|
|
///////////////////////////////////////////////////////////////////////
|
|
/// returns an instance with elements specified by the Indices
|
|
/// parameter. eg, point2f p{}.indices<0,2> would return {p.x, p.z}.
|
|
///
|
|
/// it's ugly as sin, but simplifies some situations where we don't
|
|
/// want a temporary.
|
|
template <std::size_t ...Indices>
|
|
constexpr auto
|
|
indices (void) const
|
|
{
|
|
static_assert (
|
|
all (make_vector ((Indices < S)...)),
|
|
"indices must fall within the defined range for the type"
|
|
);
|
|
|
|
return redim_t<SelfT,sizeof...(Indices)> {
|
|
this->data[Indices]...
|
|
};
|
|
}
|
|
};
|
|
}
|
|
|
|
#endif
|