Member SoundSystem::play_sound (const std::string &source_name, const std::string &sound_name): if you try to play a sound which is already playing this fails, need to enqueue the sound for playback or somehow play two at once? or just overwrite the last sound playing.
Member UI::add_dropdown (std::function< void()> on_click, std::function< void()> on_hover, int dropdown_option_idx, const vertex_geometry::Rectangle &rect, const glm::vec3 &regular_color, const glm::vec3 &hover_color, const std::vector< std::string > &options, std::function< void(std::string)> option_on_click, std::function< void(std::string)> option_on_hover, const glm::vec3 &option_color=glm::vec3(0), const glm::vec3 &option_hover_color=glm::vec3(0)): options must not be empty or else it crashes, also dropdown_option_idx must be a valid index of options