coord: use inherited class for data definitions
keep as many operations centralised in the base coord class as possible.
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detail/coord.hpp
209
detail/coord.hpp
@ -5,16 +5,16 @@
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* terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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*
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* libgim is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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*
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* You should have received a copy of the GNU General Public License
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* along with libgim. If not, see <http://www.gnu.org/licenses/>.
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*
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* Copyright 2012 Danny Robson <danny@nerdcruft.net>
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* Copyright 2012-2015 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_COORD_HPP
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@ -39,173 +39,120 @@ namespace util {
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#if defined(COMPILER_CLANG)
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#pragma GCC diagnostic ignored "-Wgnu"
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#endif
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//---------------------------------------------------------------------
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// coord types are not really intended to have arbitrary dimension, so
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// don't add specialisations (or a general case) without a decent
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// reason.
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template <size_t S, typename T>
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struct coord {
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typedef T value_type;
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coord () { ; }
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explicit coord (T v)
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{ std::fill (std::begin (data), std::end (data), v); }
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template <typename ...U>
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coord (U ..._u): data{_u...}
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{ ; }
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coord (const coord<S,T> &rhs) = default;
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coord& operator= (const coord<S,T> &rhs) = default;
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T data[S];
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static constexpr size_t dimension = S;
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T& operator[] (size_t i) { return data[i]; }
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T operator[] (size_t i) const { return data[i]; }
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};
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struct coord_data;
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//---------------------------------------------------------------------
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template <typename T>
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struct coord<1,T> {
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typedef T value_type;
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coord () { ; }
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explicit coord (T v)
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{ std::fill (std::begin (data), std::end (data), v); }
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template <typename ...U>
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coord (U ..._u): data{_u...}
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struct coord_data<1, T>
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{
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coord_data () = default;
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coord_data (T v0):
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data { v0 }
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{ ; }
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coord (const coord<1,T> &rhs) = default;
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coord& operator= (const coord<1,T> &rhs) = default;
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union {
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T data[1];
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T x;
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};
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static constexpr size_t dimension = 1;
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T& operator[] (size_t i) { return data[i]; }
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T operator[] (size_t i) const { return data[i]; }
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};
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//---------------------------------------------------------------------
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template <typename T>
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struct coord<2,T> {
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typedef T value_type;
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coord () { ; }
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explicit coord (T v)
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{ std::fill (std::begin (data), std::end (data), v); }
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template <typename ...U>
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coord (U ..._u): data{_u...}
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struct coord_data<2,T>
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{
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coord_data () = default;
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coord_data (T v0, T v1):
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data { v0, v1 }
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{ ; }
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coord (const coord<2,T> &rhs) = default;
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coord& operator= (const coord<2,T> &rhs) = default;
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union {
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T data[2];
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struct {
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T x;
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T y;
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};
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struct {
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T s;
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T t;
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};
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struct { T x, y; };
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struct { T s, t; };
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};
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static constexpr size_t dimension = 2;
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T& operator[] (size_t i) { return data[i]; }
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T operator[] (size_t i) const { return data[i]; }
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};
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//---------------------------------------------------------------------
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template <typename T>
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struct coord<3,T> {
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typedef T value_type;
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struct coord_data<3,T>
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{
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coord_data () = default;
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coord_data (T v0, T v1, T v2):
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data { v0, v1, v2 }
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{ ; }
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union {
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T data[3];
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struct {
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T x;
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T y;
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T z;
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};
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struct {
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T r;
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T g;
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T b;
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};
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struct { T x, y, z; };
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struct { T s, t, p; };
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struct { T r, g, b; };
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};
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static constexpr size_t dimension = 3;
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coord () { ; }
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explicit coord (T v)
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{ std::fill (std::begin (data), std::end (data), v); }
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template <typename... U>
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coord (U... u): data{u...}
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{ ; }
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coord (const coord<3,T> &rhs) = default;
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coord& operator= (const coord<3,T> &rhs) = default;
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T& operator[] (size_t i) { return data[i]; }
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T operator[] (size_t i) const { return data[i]; }
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};
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template <size_t S, typename T>
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T dot (const coord<S,T> &a, const coord<S,T> &b)
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{
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T sum { 0 };
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for (size_t i = 0; i < S; ++i)
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sum += a.data[i] * b.data[i];
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return sum;
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}
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//---------------------------------------------------------------------
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template <typename T>
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struct coord<4,T> {
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typedef T value_type;
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struct coord_data<4,T>
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{
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coord_data () = default;
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coord_data (T v0, T v1, T v2, T v3):
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data { v0, v1, v2, v3 }
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{ ; }
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union {
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T data[4];
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struct {
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T x;
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T y;
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T z;
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T w;
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};
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struct {
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T r;
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T g;
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T b;
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T a;
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};
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struct { T x, y, z, w; };
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struct { T s, t, p, q; };
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struct { T r, g, b, a; };
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};
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};
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static constexpr size_t dimension = 4;
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coord () { ; }
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//---------------------------------------------------------------------
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template <size_t S, typename T>
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struct coord : public coord_data<S,T> {
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static_assert (S > 0, "coord dimensions must be strictly positive");
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typedef T value_type;
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static constexpr size_t dimension = S;
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using coord_data<S,T>::coord_data;
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coord () = default;
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explicit coord (T v)
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{ std::fill (std::begin (data), std::end (data), v); }
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{ std::fill (std::begin (this->data), std::end (this->data), v); }
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template <typename... U>
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coord (U... u): data{u...}
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{ ; }
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coord (const coord<S,T> &rhs) = default;
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coord& operator= (const coord<S,T> &rhs) = default;
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coord (const coord<4,T> &rhs) = default;
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coord& operator= (const coord<4,T> &rhs) = default;
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T& operator[] (size_t i) { return data[i]; }
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T operator[] (size_t i) const { return data[i]; }
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T& operator[] (size_t i) { return this->data[i]; }
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T operator[] (size_t i) const { return this->data[i]; }
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};
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//---------------------------------------------------------------------
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// XXX: Unsure whether this should really be defined for arbitrary
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// types in a semantic sense, but practicality suggestes this is the
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// best option; point/vector dot product is too useful.
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template <size_t S, typename T>
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T dot (const coord<S,T> &a, const coord<S,T> &b)
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{
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return std::inner_product (std::begin (a.data),
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std::end (a.data),
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std::begin (b.data),
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T {0});
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}
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#pragma GCC diagnostic pop
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}
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}
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@ -32,8 +32,6 @@ namespace util {
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/// An n-dimensional position in space.
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template <size_t S, typename T>
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struct point : public detail::coord<S,T> {
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static_assert (S > 0, "point dimensions must be strictly positive.");
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using detail::coord<S,T>::coord;
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// point operators
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@ -30,8 +30,6 @@
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namespace util {
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template <size_t S, typename T>
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struct vector : public detail::coord<S, T> {
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static_assert (S > 0, "vector dimensions must be strictly positive");
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using detail::coord<S,T>::coord;
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// arithmetic operators
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