Danny Robson
d3f434b523
The coordinate system was unable to support types that prohibited redim or retype operations. Additionally, the `tags' type used for providing named data parameters was unwiedly. We remove much of the dependance on template template parameters in the defined operations and instead define these in terms of a template specialisation of is_coord. The tag types were replaced with direct specialisation of the `store' struct by the primary type, and passing this type through use of the CRTP.
135 lines
3.9 KiB
C++
135 lines
3.9 KiB
C++
/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* 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
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Copyright 2015-2017 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef __UTIL_COORD_STORE_HPP
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#define __UTIL_COORD_STORE_HPP
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#include "fwd.hpp"
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#include "../preprocessor.hpp"
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#include "../platform.hpp"
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#include <cstddef>
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#include <type_traits>
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///////////////////////////////////////////////////////////////////////////////
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// Calculate a reasonable alignment for the given type and arity given what we
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// know about the platform. Only intended to be used with alignas specifiers.
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namespace util::coord::detail {
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template <typename T>
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constexpr
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size_t
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alignment (size_t S)
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{
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(void)S;
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#if defined(__SSE_MATH__)
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// Align to 16 if we have 4x floats on SSE/NEON. There are other
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// possiblities, but we don't care about them right at this point.
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if (!std::is_same<T,float>::value)
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return alignof (T);
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if (S % 4 == 0)
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return 16;
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#elif defined (__ARM_NEON__)
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// TODO: deal with alignment issues before adding alignas specifiers
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#endif
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return alignof (T);
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}
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}
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#define SIMD_ALIGN(S,T) alignas (util::coord::detail::alignment<T> (S))
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///////////////////////////////////////////////////////////////////////////////
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// defines the named member variables that a coordinate type is composed of
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#define DEFINE_COORD_STORE(TAG,...) \
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namespace util::coord { \
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template <typename T> \
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struct store< \
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VA_ARGS_COUNT(__VA_ARGS__), \
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T, \
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TAG \
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> { \
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union { \
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struct { \
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T __VA_ARGS__; \
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}; \
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T data[VA_ARGS_COUNT(__VA_ARGS__)]; \
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}; \
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}; \
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}
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template <typename T>
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struct util::coord::store<1,T,::util::extent<1,T>> {
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union { struct { T w; }; T data[1]; };
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};
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template <typename T>
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struct util::coord::store<2,T,::util::extent<2,T>> {
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union { struct { T w, h; }; T data[2]; };
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};
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template <typename T>
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struct util::coord::store<3,T,::util::extent<3,T>> {
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union { struct { T w, h, d; }; T data[3]; };
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};
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template <typename T>
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struct util::coord::store<1,T,::util::point<1,T>> {
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union { struct { T x; }; T data[1]; };
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};
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template <typename T>
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struct util::coord::store<2,T,::util::point<2,T>> {
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union { struct { T x, y; }; T data[2]; };
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};
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template <typename T>
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struct util::coord::store<3,T,::util::point<3,T>> {
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union { struct { T x, y, z; }; T data[3]; };
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};
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template <typename T>
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struct util::coord::store<4,T,::util::point<4,T>> {
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union { struct { T x, y, z, w; }; T data[4]; };
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};
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template <typename T>
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struct util::coord::store<1,T,::util::vector<1,T>> {
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union { struct { T x; }; T data[1]; };
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};
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template <typename T>
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struct util::coord::store<2,T,::util::vector<2,T>> {
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union { struct { T x, y; }; T data[2]; };
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};
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template <typename T>
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struct util::coord::store<3,T,::util::vector<3,T>> {
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union { struct { T x, y, z; }; T data[3]; };
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};
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template <typename T>
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struct util::coord::store<4,T,::util::vector<4,T>> {
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union { struct { T x, y, z, w; }; T data[4]; };
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};
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#endif
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