188 lines
6.4 KiB
C++
188 lines
6.4 KiB
C++
/* -*- C++ -*- ------------------------------------------------------------
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Copyright (c) 2007 Jesse Anders and Demian Nave http://cmldev.net/
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The Configurable Math Library (CML) is distributed under the terms of the
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Boost Software License, v1.0 (see cml/LICENSE for details).
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*-----------------------------------------------------------------------*/
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/** @file
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* @brief
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*
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* Defines promotions for matrices used in matrix/matrix or matrix/scalar
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* expressions.
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*
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* @sa UnaryMat4_TOp
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* @sa BinaryMat4_TOp
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*/
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#ifndef matrix_promotions_h
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#define matrix_promotions_h
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#include <cml/core/cml_meta.h>
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#include <cml/et/scalar_promotions.h>
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#include <cml/et/array_promotions.h>
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#include <cml/fixed.h>
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#include <cml/dynamic.h>
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/* This is used below to create a more meaningful compile-time error when
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* either argument to OuterPromote has the wrong orientation.
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*/
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struct outer_promote_expects_properly_oriented_args_error;
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namespace cml {
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namespace et {
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/** Promote two types to a matrixt type. */
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template<typename LeftT, typename RightT> struct MatrixPromote
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{
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/* Default matrix type promotion template. */
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template<typename M1, typename M2> struct MatrixPromoteHelper;
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/** Type promotion for two matrix types.
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*
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* @note This always uses the basis orientation of the left-hand matrix.
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* @bug This always uses the basis orientation of the left-hand matrix,
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* which is not always correct.
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*/
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template<typename E1, class AT1, typename L1, typename BO1,
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typename E2, class AT2, typename L2, typename BO2>
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struct MatrixPromoteHelper<
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cml::matrix<E1,AT1,BO1,L1>, cml::matrix<E2,AT2,BO2,L2>
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>
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{
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/* Promote the arrays: */
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typedef typename ArrayPromote<
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typename cml::matrix<E1,AT1,BO1,L1>::array_type,
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typename cml::matrix<E2,AT2,BO2,L2>::array_type
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>::type promoted_array;
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/* The deduced matrix result type: */
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typedef cml::matrix<
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typename promoted_array::value_type,
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typename promoted_array::generator_type,
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BO1,
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typename promoted_array::layout
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> type;
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/* The deduced temporary type: */
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typedef typename type::temporary_type temporary_type;
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};
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/** Type promotion for a matrix and a scalar. */
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template<typename E, class AT, typename BO, typename L, typename S>
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struct MatrixPromoteHelper<cml::matrix<E,AT,BO,L>, S>
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{
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/* The deduced matrix result type (the array type is the same): */
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typedef cml::matrix<typename ScalarPromote<E,S>::type, AT, BO, L> type;
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/* The deduced temporary type: */
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typedef typename type::temporary_type temporary_type;
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};
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/** Type promotion for a scalar and a matrix. */
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template<typename S, typename E, class AT, typename BO, typename L>
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struct MatrixPromoteHelper<S, cml::matrix<E,AT,BO,L> >
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{
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/* The deduced matrix result type (the array type is the same): */
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typedef cml::matrix<typename ScalarPromote<S,E>::type, AT, BO, L> type;
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/* The deduced temporary type: */
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typedef typename type::temporary_type temporary_type;
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};
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/** Type promotion for outer product. */
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template<typename E1, class AT1, typename E2, class AT2>
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struct MatrixPromoteHelper< cml::vector<E1,AT1>, cml::vector<E2,AT2> >
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{
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typedef cml::vector<E1,AT1> left_type;
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typedef cml::vector<E2,AT2> right_type;
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typedef CML_DEFAULT_BASIS_ORIENTATION basis_orient;
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/* Get matrix size: */
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enum {
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array_rows = left_type::array_size,
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array_cols = right_type::array_size
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};
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/* Deduce the corresponding matrix types for the vectors: */
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typedef CML_DEFAULT_ARRAY_LAYOUT layout;
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typedef typename select_if<
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array_rows == -1, dynamic<>, fixed<array_rows,1>
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>::result left_storage;
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typedef cml::matrix<E1,left_storage,basis_orient,layout> left_matrix;
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typedef typename select_if<
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array_cols == -1, dynamic<>, fixed<1,array_cols>
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>::result right_storage;
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typedef cml::matrix<E2,right_storage,basis_orient,layout> right_matrix;
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/* Finally, promote the matrix types to get the result: */
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typedef typename et::MatrixPromote<left_matrix,right_matrix>::type type;
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typedef typename type::temporary_type temporary_type;
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};
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/** Remove const and & from the to-be-promoted types. */
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typedef typename remove_const<
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typename remove_reference<LeftT>::type>::type LeftBaseT;
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typedef typename remove_const<
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typename remove_reference<RightT>::type>::type RightBaseT;
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typedef typename MatrixPromoteHelper<LeftBaseT,RightBaseT>::type type;
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typedef typename type::temporary_type temporary_type;
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};
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/**
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* NOTE: MatrixPromote* are somewhat ad hoc, and were added to
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* simplify the code for matrix slerp/squad/etc.
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*/
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/** Type promotion for two matrix types. */
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template < class Mat1_T, class Mat2_T >
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struct MatrixPromote2
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{
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typedef typename MatrixPromote<
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typename Mat1_T::temporary_type, typename Mat2_T::temporary_type
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>::temporary_type temporary_type;
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typedef typename temporary_type::value_type value_type;
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};
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/** Type promotion for three matrix types. */
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template < class Mat1_T, class Mat2_T, class Mat3_T >
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struct MatrixPromote3
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{
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typedef typename MatrixPromote<
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typename Mat1_T::temporary_type,
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typename MatrixPromote<
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typename Mat2_T::temporary_type,
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typename Mat3_T::temporary_type
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>::temporary_type
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>::temporary_type temporary_type;
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typedef typename temporary_type::value_type value_type;
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};
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/** Type promotion for four matrix types. */
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template < class Mat1_T, class Mat2_T, class Mat3_T, class Mat4_T >
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struct MatrixPromote4
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{
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typedef typename MatrixPromote<
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typename Mat1_T::temporary_type,
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typename MatrixPromote<
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typename Mat2_T::temporary_type,
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typename MatrixPromote<
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typename Mat3_T::temporary_type,
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typename Mat4_T::temporary_type
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>::temporary_type
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>::temporary_type
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>::temporary_type temporary_type;
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typedef typename temporary_type::value_type value_type;
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};
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} // namespace et
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} // namespace cml
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#endif
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// -------------------------------------------------------------------------
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// vim:ft=cpp
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