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https://git.code.sf.net/p/quake/quakeforge
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33295a8ad9
Simple k-vectors don't use structs for their layout since they're just an array of scalars, but having the structs for group sets or full multi-vectors makes the system alignment agnostic.
119 lines
4.2 KiB
C
119 lines
4.2 KiB
C
/*
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algebra.h
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QC geometric algebra support code
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Copyright (C) 2023 Bill Currie <bill@taniwha.org>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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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.
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See the GNU General Public License for more details.
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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, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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*/
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#ifndef __algebra_h
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#define __algebra_h
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#include "QF/set.h"
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#include "QF/progs/pr_comp.h"
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typedef struct basis_blade_s {
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pr_uint_t mask; ///< bit-mask of basis vectors
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int scale; ///< 1, 0, or -1
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} basis_blade_t;
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typedef struct basis_group_s {
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int count;
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pr_uint_t group_mask;
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pr_uivec2_t range;
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basis_blade_t *blades;
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int *map;
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set_t *set;
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} basis_group_t;
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typedef struct basis_layout_s {
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int count;
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pr_uivec2_t range;
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basis_group_t *groups;
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pr_ivec3_t *group_map;
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int *mask_map;
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int blade_count;
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set_t *set;
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} basis_layout_t;
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typedef struct metric_s {
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pr_uint_t plus; ///< mask of elements that square to +1
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pr_uint_t minus; ///< mask of elements that square to -1
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pr_uint_t zero; ///< mask of elements that square to 0
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} metric_t;
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typedef struct algebra_s {
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struct type_s *type; ///< underlying type (float or double)
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struct type_s *algebra_type;///< type for algebra
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metric_t metric;
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basis_layout_t layout;
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basis_group_t *groups;
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struct type_s **mvec_types;
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struct symbol_s *mvec_sym;
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int num_components; ///< number of componets (2^d)
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int dimension; ///< number of dimensions (plus + minus + zero)
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int plus; ///< number of elements squaring to +1
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int minus; ///< number of elements squaring to -1
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int zero; ///< number of elements squaring to 0
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} algebra_t;
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typedef struct multivector_s {
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int num_components;
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int group_mask;
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algebra_t *algebra;
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struct symbol_s *mvec_sym; ///< null if single group
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} multivector_t;
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struct expr_s;
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struct attribute_s;
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bool is_algebra (const struct type_s *type) __attribute__((pure));
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struct type_s *algebra_type (struct type_s *type, struct expr_s *params);
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struct type_s *algebra_subtype (struct type_s *type, struct attribute_s *attr);
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struct type_s *algebra_mvec_type (algebra_t *algebra, pr_uint_t group_mask);
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int algebra_count_flips (const algebra_t *alg, pr_uint_t a, pr_uint_t b) __attribute__((pure));
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struct ex_value_s *algebra_blade_value (algebra_t *alg, const char *name);
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struct symtab_s *algebra_scope (struct type_s *type, struct symtab_s *curscope);
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void algebra_print_type_str (struct dstring_s *str, const struct type_s *type);
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void algebra_encode_type (struct dstring_s *encoding,
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const struct type_s *type);
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int algebra_type_size (const struct type_s *type) __attribute__((pure));
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int algebra_type_width (const struct type_s *type) __attribute__((pure));
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int metric_apply (const metric_t *metric, pr_uint_t a, pr_uint_t b) __attribute__((pure));
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algebra_t *algebra_get (const struct type_s *type) __attribute__((pure));
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int algebra_type_assignable (const struct type_s *dst,
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const struct type_s *src) __attribute__((pure));
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struct type_s *algebra_base_type (const struct type_s *type) __attribute__((pure));
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bool is_mono_grade (const struct type_s *type) __attribute__((pure));
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int algebra_get_grade (const struct type_s *type) __attribute__((pure));
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int algebra_blade_grade (basis_blade_t blade) __attribute__((const));
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struct expr_s *algebra_binary_expr (int op, struct expr_s *e1,
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struct expr_s *e2);
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struct expr_s *algebra_negate (struct expr_s *e);
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struct expr_s *algebra_dual (struct expr_s *e);
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struct expr_s *algebra_reverse (struct expr_s *e);
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struct expr_s *algebra_cast_expr (struct type_s *dstType, struct expr_s *e);
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struct expr_s *algebra_assign_expr (struct expr_s *dst, struct expr_s *src);
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#endif//__algebra_h
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