Modifying the render function

We will add a new line to the very beginning of the render function. This line will render the background starfield and move it based on the camera position:

 render_manager->RenderBackground();

After that, we will need to add a line to the end of the render function. This line will need to come immediately before the SDL_RenderPresent call, which will still need to be the last line in this function:

 locator->Render();

This is what the render() function looks like in its entirety:

void render() {
 render_manager->RenderBackground();
    player->Render();
    enemy->Render();
    projectile_pool->RenderProjectiles();

    Asteroid* asteroid;
    std::vector<Asteroid*>::iterator it;
    for( it = asteroid_list.begin(); it != asteroid_list.end(); it++ ) {
        asteroid = *it;
        asteroid->Render();
    }
    star->Render();
    locator->Render();
 
    SDL_RenderPresent( renderer );
}