Add Chromium-only Blender WebEngine parity work

blender-5.2.0/intern/eigen/intern/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 */
+
+/** \file
+ * \ingroup intern_eigen
+ * Sparse linear solver.
+ */
+
+#pragma once
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Solvers for Ax = b and AtAx = Atb */
+
+struct 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