jolt_soft_body_3d.h

/**************************************************************************/
/*  jolt_soft_body_3d.h                                                   */
/**************************************************************************/
/*                         This file is part of:                          */
/*                             GODOT ENGINE                               */
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#pragma once

#include "jolt_object_3d.h"

#include "servers/physics_server_3d.h"

#include "Jolt/Jolt.h"

#include "Jolt/Physics/SoftBody/SoftBodyCreationSettings.h"
#include "Jolt/Physics/SoftBody/SoftBodySharedSettings.h"

class JoltSpace3D;

class JoltSoftBody3D final : public JoltObject3D {
	struct Shared {
		LocalVector<int> mesh_to_physics;
		JPH::Ref<JPH::SoftBodySharedSettings> settings = new JPH::SoftBodySharedSettings();
		int ref_count = 1;
	};

	inline static HashMap<RID, Shared> mesh_to_shared;

	HashSet<int> pinned_vertices;
	LocalVector<RID> exceptions;
	LocalVector<Vector3> normals;

	const Shared *shared = nullptr;

	RID mesh;

	JPH::SoftBodyCreationSettings *jolt_settings = new JPH::SoftBodyCreationSettings();

	float mass = 0.0f;
	float pressure = 0.0f;
	float linear_damping = 0.01f;
	float stiffness_coefficient = 0.5f;
	float shrinking_factor = 0.0f;

	int simulation_precision = 5;

	virtual JPH::BroadPhaseLayer _get_broad_phase_layer() const override;
	virtual JPH::ObjectLayer _get_object_layer() const override;

	virtual void _space_changing() override;
	virtual void _space_changed() override;

	virtual void _add_to_space() override;

	bool _ref_shared_data();
	void _deref_shared_data();

	void _update_mass();
	void _update_pressure();
	void _update_damping();
	void _update_simulation_precision();
	void _update_group_filter();

	void _try_rebuild();

	void _mesh_changed();
	void _simulation_precision_changed();
	void _mass_changed();
	void _pressure_changed();
	void _damping_changed();
	void _pins_changed();
	void _vertices_changed();
	void _exceptions_changed();
	void _motion_changed();

public:
	JoltSoftBody3D();
	virtual ~JoltSoftBody3D() override;

	bool in_space() const;

	void add_collision_exception(const RID &p_excepted_body);
	void remove_collision_exception(const RID &p_excepted_body);
	bool has_collision_exception(const RID &p_excepted_body) const;

	const LocalVector<RID> &get_collision_exceptions() const { return exceptions; }

	virtual bool can_interact_with(const JoltBody3D &p_other) const override;
	virtual bool can_interact_with(const JoltSoftBody3D &p_other) const override;
	virtual bool can_interact_with(const JoltArea3D &p_other) const override;

	virtual bool reports_contacts() const override { return false; }

	virtual Vector3 get_velocity_at_position(const Vector3 &p_position) const override;

	void set_mesh(const RID &p_mesh);

	bool is_pickable() const { return pickable; }
	void set_pickable(bool p_enabled) { pickable = p_enabled; }

	bool is_sleeping() const;
	void set_is_sleeping(bool p_enabled);

	bool is_sleep_allowed() const;
	void set_is_sleep_allowed(bool p_enabled);

	void put_to_sleep() { set_is_sleeping(true); }
	void wake_up() { set_is_sleeping(false); }

	int get_simulation_precision() const { return simulation_precision; }
	void set_simulation_precision(int p_precision);

	float get_mass() const { return mass; }
	void set_mass(float p_mass);

	float get_stiffness_coefficient() const;
	void set_stiffness_coefficient(float p_coefficient);

	float get_shrinking_factor() const;
	void set_shrinking_factor(float p_shrinking_factor);

	float get_pressure() const { return pressure; }
	void set_pressure(float p_pressure);

	float get_linear_damping() const { return linear_damping; }
	void set_linear_damping(float p_damping);

	float get_drag() const;
	void set_drag(float p_drag);

	Variant get_state(PhysicsServer3D::BodyState p_state) const;
	void set_state(PhysicsServer3D::BodyState p_state, const Variant &p_value);

	Transform3D get_transform() const;
	void set_transform(const Transform3D &p_transform);

	AABB get_bounds() const;

	void update_rendering_server(PhysicsServer3DRenderingServerHandler *p_rendering_server_handler);

	Vector3 get_vertex_position(int p_index);
	void set_vertex_position(int p_index, const Vector3 &p_position);

	void pin_vertex(int p_index);
	void unpin_vertex(int p_index);

	void unpin_all_vertices();

	bool is_vertex_pinned(int p_index) const;

	void apply_vertex_impulse(int p_index, const Vector3 &p_impulse);
	void apply_vertex_force(int p_index, const Vector3 &p_force);
	void apply_central_impulse(const Vector3 &p_impulse);
	void apply_central_force(const Vector3 &p_force);
};