Some code to make sure CPU consumption is low in SDL2/C++

timestepping-sdl2.cpp

bool gameRunning = true;

SDL_Event event;

const float timeStep = 0.01f;
float accumulater = 0.0f;
float currentTime = utils::hireTimeInSeconds();

while (gameRunning) {

    int startTicks = SDL_GetTicks();

    float newTime = utils::hireTimeInSeconds();
    float frameTime = newTime - currentTime;

    currentTime = newTime;

    accumulater += frameTime;

    while (accumulater >= timeStep) {
        while (SDL_PollEvent(&event)) {
            if (event.type == SDL_QUIT)
                gameRunning = false;
        }
        accumulater -= timeStep;
    }

    const float alpha = accumulater / timeStep;

    window.clear();

    for (Entity& e : entities) {
        window.render(e);
    }

    window.display();

    int frameTicks = SDL_GetTicks() - startTicks;

    if (frameTicks < 1000/window.getRefreshRate())
        SDL_Delay(1000/window.getRefreshRate() - frameTicks);
}