/*************************************************************************/
/*  godot_step_2d.h                                                      */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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/*************************************************************************/

#ifndef GODOT_STEP_2D_H
#define GODOT_STEP_2D_H

#include "godot_space_2d.h"

#include "core/templates/local_vector.h"
#include "core/templates/thread_work_pool.h"

class GodotStep2D {
	uint64_t _step = 1;

	int iterations = 0;
	real_t delta = 0.0;

	ThreadWorkPool work_pool;

	LocalVector<LocalVector<GodotBody2D *>> body_islands;
	LocalVector<LocalVector<GodotConstraint2D *>> constraint_islands;
	LocalVector<GodotConstraint2D *> all_constraints;

	void _populate_island(GodotBody2D *p_body, LocalVector<GodotBody2D *> &p_body_island, LocalVector<GodotConstraint2D *> &p_constraint_island);
	void _setup_contraint(uint32_t p_constraint_index, void *p_userdata = nullptr);
	void _pre_solve_island(LocalVector<GodotConstraint2D *> &p_constraint_island) const;
	void _solve_island(uint32_t p_island_index, void *p_userdata = nullptr) const;
	void _check_suspend(LocalVector<GodotBody2D *> &p_body_island) const;

public:
	void step(GodotSpace2D *p_space, real_t p_delta);
	GodotStep2D();
	~GodotStep2D();
};

#endif // GODOT_STEP_2D_H