83 lines
2.7 KiB
C++
83 lines
2.7 KiB
C++
// =====================================================================================================================
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// fennec, a free and open source game engine
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// Copyright © 2025 - 2026 Medusa Slockbower
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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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 this program. If not, see <https://www.gnu.org/licenses/>.
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// =====================================================================================================================
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#ifndef FENNEC_MATH_DETAIL_VECTOR_TRAITS_H
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#define FENNEC_MATH_DETAIL_VECTOR_TRAITS_H
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#include <fennec/math/detail/_forward.h>
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#include <fennec/lang/type_traits.h>
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#include <fennec/math/swizzle.h>
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namespace fennec
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{
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namespace detail
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{
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// Helpers for vector traits
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template<typename>
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struct _is_vector_helper
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: false_type {}; // Default false case
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template<typename ScalarT, size_t...IndicesV>
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struct _is_vector_helper<vector<ScalarT, IndicesV...>>
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: true_type {}; // True for vectors
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template<typename VectorT, typename DataT, typename ScalarT, size_t...IndicesV>
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struct _is_vector_helper<swizzle<VectorT, DataT, ScalarT, IndicesV...>>
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: true_type {}; // True for swizzles
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// get number of components of a type
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template<typename>
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struct _component_count_helper;
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// numeric types reduce to 1
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template<typename TypeT> requires(is_arithmetic_v<TypeT>)
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struct _component_count_helper<TypeT>
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: integral_constant<size_t, 1> {};
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// Vectors reduce to the number of elements
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template<typename ScalarT, size_t...IndicesV>
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struct _component_count_helper<vector<ScalarT, IndicesV...>>
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: integral_constant<size_t, sizeof...(IndicesV)> {};
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// Swizzles reduce to number of elements
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template<typename VectorT, typename DataT, typename ScalarT, size_t...IndicesV>
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struct _component_count_helper<swizzle<VectorT, DataT, ScalarT, IndicesV...>>
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: integral_constant<size_t, sizeof...(IndicesV)> {};
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// Matrices reduce to the number of cells
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template<typename ScalarT, size_t RowsV, size_t...ColIndicesV>
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struct _component_count_helper<matrix<ScalarT, RowsV, ColIndicesV...>>
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: integral_constant<size_t, RowsV * sizeof...(ColIndicesV)> {};
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// default case reduces to 0
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template<typename>
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struct _component_count_helper
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: integral_constant<size_t, 0> {};
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}
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}
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#endif // FENNEC_MATH_DETAIL_VECTOR_TRAITS_H
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