FrameStatsPanel.hpp

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#pragma once
 
#include "common/Export.h"
 
#include <mutex>
#include <string>
 
namespace eve::dev {
 
class EVENGINE_API_FOUNDATION FrameStatsPanel {
public:
    static FrameStatsPanel& instance();
 
    FrameStatsPanel(const FrameStatsPanel&)            = delete;
    FrameStatsPanel& operator=(const FrameStatsPanel&) = delete;
 
    void setVisible(bool on);
    bool isVisible() const;
    void toggleVisible();
 
    void sample(float dtSeconds);
 
    void setEntityCount(int count);
    void clearEntityCount();
 
    float fps() const;
    float frameMs() const;
    int   entityCount() const;  
    bool  hasEntityCount() const;
 
    std::string format() const;
 
    void drawImGui();
 
    using ImGuiDrawer = void (*)(FrameStatsPanel& panel);
    static void setImGuiDrawer(ImGuiDrawer fn);
 
private:
    template <typename>
    friend struct Immortal;
    FrameStatsPanel() = default;
 
    mutable std::mutex mu_;
    bool               visible_         = false;
    float              lastDt_          = 0.f;
    float              emaFps_          = 0.f;
    int                entityCount_     = -1;
};
 
}  // namespace eve::dev