linear_solver.h

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/* SPDX-FileCopyrightText: 2004 Bruno Levy
 * SPDX-FileCopyrightText: 2005-2015 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include <stdbool.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
/* Solvers for Ax = b and AtAx = Atb */
 
typedef struct LinearSolver LinearSolver;
 
LinearSolver *EIG_linear_solver_new(int num_rows, int num_columns, int num_right_hand_sides);
 
LinearSolver *EIG_linear_least_squares_solver_new(int num_rows,
                                                  int num_columns,
                                                  int num_right_hand_sides);
 
void EIG_linear_solver_delete(LinearSolver *solver);
 
/* Variables (x). Any locking must be done before matrix construction. */
 
void EIG_linear_solver_variable_set(LinearSolver *solver, int rhs, int index, double value);
double EIG_linear_solver_variable_get(LinearSolver *solver, int rhs, int index);
void EIG_linear_solver_variable_lock(LinearSolver *solver, int index);
void EIG_linear_solver_variable_unlock(LinearSolver *solver, int index);
 
/* Matrix (A) and right hand side (b) */
 
void EIG_linear_solver_matrix_add(LinearSolver *solver, int row, int col, double value);
void EIG_linear_solver_right_hand_side_add(LinearSolver *solver, int rhs, int index, double value);
 
/* Solve. Repeated solves are supported, by changing b between solves. */
 
bool EIG_linear_solver_solve(LinearSolver *solver);
 
/* Debugging */
 
void EIG_linear_solver_print_matrix(LinearSolver *solver);
 
#ifdef __cplusplus
}
#endif