camera-system.hpp

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/*
 * Copyright (C) 2023  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#ifndef ANTKEEPER_GAME_CAMERA_SYSTEM_HPP
#define ANTKEEPER_GAME_CAMERA_SYSTEM_HPP
 
#include "game/systems/updatable-system.hpp"
#include <engine/math/vector.hpp>
 
class camera_system: public updatable_system
{
public:
    explicit camera_system(entity::registry& registry);
    void update(float t, float dt) override;
    void interpolate(float alpha);
    
    void set_viewport(const math::fvec4& viewport);
 
private:
    math::dvec4 m_viewport{};
    double m_aspect_ratio{};
    double m_fixed_update_time{};
    double m_fixed_timestep{};
    double m_variable_update_time{};
};
 
#endif // ANTKEEPER_GAME_CAMERA_SYSTEM_HPP