DifferentiableVarForm.hpp

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#pragma once
 
#include <polyfem/varforms/VarForm.hpp>
 
#include <polyfem/assembler/Mass.hpp>
#include <polyfem/assembler/ViscousDamping.hpp>
#include <polyfem/solver/SolveData.hpp>
 
#include <ipc/collision_mesh.hpp>
 
#include <array>
#include <unordered_map>
 
namespace polyfem::mesh
{
    class Obstacle;
}
 
namespace polyfem::varform
{
    class DifferentiableVarForm
    {
    public:
        virtual ~DifferentiableVarForm() = default;
 
        virtual std::string name() const = 0;
        virtual void solve(
            Eigen::MatrixXd &solution,
            const InitialConditionOverride *initial_condition_override,
            const ForwardStepCallback &post_step,
            bool differentiable) = 0;
        virtual void prepare() = 0;
        virtual void save_vtu(const std::string &path, const Eigen::MatrixXd &solution, double time, double dt) const = 0;
 
        virtual json &get_args() = 0;
        virtual const json &get_args() const = 0;
        virtual const mesh::Mesh &get_mesh() const = 0;
        virtual assembler::Problem &get_problem() = 0;
        virtual const assembler::Problem &get_problem() const = 0;
        virtual std::string output_file_path(const std::string &path) const = 0;
        virtual const Units &get_units() const = 0;
        virtual bool is_contact_enabled() const = 0;
 
        virtual const FESpace &primary_space() const = 0;
        virtual const VarFormBoundaryState &boundary_state() const = 0;
        virtual const assembler::Assembler &primary_assembler() const = 0;
        virtual const assembler::Mass &mass_assembler() const = 0;
        virtual const assembler::AssemblyValsCache &assembly_cache() const = 0;
        virtual const assembler::AssemblyValsCache &mass_assembly_cache() const = 0;
        virtual const StiffnessMatrix &mass_matrix() const = 0;
        virtual solver::SolveData *solve_data() = 0;
        virtual const solver::SolveData *solve_data() const = 0;
        virtual const ipc::CollisionMesh &collision_mesh() const;
        virtual const mesh::Obstacle &get_obstacle() const;
        virtual const assembler::ViscousDamping *damping_assembler() const { return nullptr; }
        virtual const assembler::ViscousDampingPrev *damping_prev_assembler() const { return nullptr; }
        virtual void initial_solution(Eigen::MatrixXd &solution, const InitialConditionOverride *override = nullptr) const;
        virtual void initial_velocity(Eigen::MatrixXd &velocity, const InitialConditionOverride *override = nullptr) const;
        virtual void initial_acceleration(Eigen::MatrixXd &acceleration, const InitialConditionOverride *override = nullptr) const;
        virtual Eigen::MatrixXd displacement_gradient() const;
 
        void get_vertices(Eigen::MatrixXd &vertices) const;
        std::unordered_map<int, std::array<bool, 3>> boundary_conditions_ids(const std::string &bc_type) const;
        bool is_homogenization() const;
        bool has_periodic_boundary() const;
        Eigen::MatrixXd periodic_tile_offsets() const;
        bool is_adhesion_enabled() const;
        bool is_pressure_enabled() const;
        bool has_constraints() const;
        bool is_problem_linear() const;
 
        void build_stiffness_matrix(StiffnessMatrix &stiffness) const;
        std::vector<int> primitive_to_node() const;
        std::vector<int> node_to_primitive() const;
        void get_elements(Eigen::MatrixXi &elements) const;
        QuadratureOrders n_boundary_samples() const;
 
        void set_vertex_positions(const Eigen::MatrixXd &vertices);
        virtual void set_lame_parameters(const Eigen::VectorXd &lambda, const Eigen::VectorXd &mu);
        virtual void set_friction_coefficient(double coefficient);
        virtual void set_damping_coefficients(double psi, double phi);
        virtual void set_dirichlet_boundary(int boundary_id, int time_step, const Eigen::VectorXd &value);
        virtual void set_dirichlet_nodes(const Eigen::VectorXi &input_nodes, const Eigen::MatrixXd &values);
        virtual void set_pressure_boundary(int boundary_id, int time_step, double value);
 
    protected:
        virtual mesh::Mesh &mutable_mesh() = 0;
        virtual void invalidate_after_geometry_update() = 0;
        virtual void invalidate_after_parameter_update() = 0;
        virtual QuadratureOrders boundary_samples(int discr_order, int discr_orderq, int geometry_discr_order) const = 0;
    };
} // namespace polyfem::varform