BasaltMeter/BasaltPresenter/Presenter/dll_loader.hpp

#include <basalt/char_types.hpp>
#include <string_view>

#if defined(BASALT_OS_WINDOWS)
#include <Windows.h>
#else
#include <dlfcn.h>
#endif

namespace Basalt::Presenter {

    enum class DllKind {
        Engine, ///< Render engine
        Deliver, ///< Data deliver
        ObjectLoader, ///< 3D object loader
        AnimeLoader, ///< Camera animation loader
    };

    class DllLoader {
    public:
#if defined(BASALT_OS_WINDOWS)
        using Handle = HMODULE;
#else
        using Handle = void*;
#endif

    public:
        DllLoader(DllKind kind, const Shared::Char::BSStringView& filename);
        ~DllLoader();

    private:
        void* GetFunctionPointer(const char* name);

    public:
        template<typename T>
        T* CreateInstance() {
            using Fct = T* (*) ();
            constexpr char EXPOSE_FUNC_NAME[] = "BSCreateInstance";
            auto fct = (Fct) GetFunctionPointer(EXPOSE_FUNC_NAME);
            return fct();
        }
        template<typename T>
        void DestroyInstance(T* instance) {
            using Fct = void (*) (T*);
            constexpr char EXPOSE_FUNC_NAME[] = "BSDestroyInstance";
            auto fct = (Fct) GetFunctionPointer(EXPOSE_FUNC_NAME);
            fct(instance);
        }

    private:
        Handle m_Handle;
    };

} // namespace Basalt::Presenter