cpp-game-engine/engine/include/game/engine/fps_counter.hpp

//
//  fps_counter.hpp
//  engine
//
//  Created by Sam Jaffe on 5/24/19.
//  Copyright © 2019 Sam Jaffe. All rights reserved.
//

#pragma once

#include <vector>

#include "game/graphics/graphics_fwd.h"
#include "game/util/time.hpp"

namespace engine {
  class text_engine;
  class fps_counter {
  public:
    fps_counter(std::shared_ptr<text_engine> text_engine,
                std::size_t precision = 3);
    ~fps_counter();

    void set_frame_step(env::clock::duration const & since);

    void render(graphics::renderer & renderer) const;
    std::vector<graphics::object> const & glyphs() const { return glyphs_; }

  private:
    std::string fps(env::clock::duration const & since) const;

    int counter_{0}, change_after_{10};
    std::size_t digits_;
    std::size_t magnitude_;
    std::shared_ptr<text_engine> text_engine_;
    std::vector<graphics::object> glyphs_;
  };
}