Function on_graphics_thread

src/python/python_runtime.cpp:1086–1089

    void set_graphics_thread_id(std::thread::id id) { g_graphics_thread_id = id; }

    bool on_graphics_thread() {
        return g_graphics_thread_id != std::thread::id{} &&
               std::this_thread::get_id() == g_graphics_thread_id;
    }

    void schedule_graphics_callback(std::function<void()> fn) {
        std::lock_guard lock(g_graphics_callbacks_mutex);