Why is my rotating cube flickering?

[HappySapeta]

Hello.
I have recently begun learning Filament with SDL + OpenGL.
I have setup a simple scene with a rotating cube.

Here's my update loop :

void HelloFilament::UpdateLoop()
{
    SDL_Event event;
    while(SDL_PollEvent(&event))
    {
        if(event.type == SDL_QUIT)
        {
            run_loop = false;
        }
    }

    static filament::TransformManager::Instance renderable_instance = transform_manager_->getInstance(renderable_);
    const auto& current_transform = transform_manager_->getTransform(renderable_instance);
    transform_manager_->setTransform(renderable_instance, current_transform * filament::math::mat4f::rotation(0.05, filament::math::vec3<int>{0, 0, 1}));

    
    if(renderer_->beginFrame(swapChain_))
    {
        renderer_->render(view_);
        renderer_->endFrame();
    }

    SDL_GL_SwapWindow(window_);
    glClear(GL_COLOR_BUFFER_BIT);
}

And here's how I have created my window :

void HelloFilament::InitializeWindow()
{
    window_flags_ = SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL;
    window_ = SDL_CreateWindow
    (
        "HelloFilament",
        SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
        screen_width_, screen_height_,
        window_flags_
    );

    const char* error_msg = std::format("Failed to create SDL window. {}", SDL_GetError()).c_str();
    assert(window_ && error_msg);

    gl_context_ = SDL_GL_CreateContext(window_);
    
    SDL_GL_MakeCurrent(window_, gl_context_);
    SDL_GL_SetSwapInterval(1);
    
    SDL_SysWMinfo wmi;
    SDL_VERSION(&wmi.version);
    SDL_GetWindowWMInfo(window_, &wmi);
    native_window_ = (HWND) wmi.info.win.window;
}

Finally here's the result : (⚠️ seizure warning ⚠️ flashing lights ⚠️)

I don't understand why the scene flickers so much. Am I not handling buffers correctly ?

[HappySapeta]

My update loop was missing vsync implementation.

// Delay rendering for roughly one monitor refresh interval
    SDL_DisplayMode Mode;
    int refreshIntervalMS = (SDL_GetDesktopDisplayMode(
        SDL_GetWindowDisplayIndex(window_), &Mode) == 0 &&
        Mode.refresh_rate != 0) ? round(1000.0 / Mode.refresh_rate) : 16;
    SDL_Delay(refreshIntervalMS);

and these lines at the end should be removed :

SDL_GL_SwapWindow(window_);
glClear(GL_COLOR_BUFFER_BIT);