ios - SDL 2.0 iOS - 未收到触摸事件

Question

这是我初始化 SDL 的方式:

//initialize engine and set main loop callback... kind of awkward is there a better way to do this?
extern "C"{
  CBCore::Engine *engine;

  void UpdateLoop(void *f)
  {
    engine->updateLoop();
  }

  int main(int argc, char *argv[])
  {
    engine = new CBCore::Engine();
    engine->init();
    Assert(engine->window(), "Window not set for iOS animation callback");
    SDL_iPhoneSetAnimationCallback(engine->window(), 1, UpdateLoop, NULL);

    return 0;  
  }
}


//init function of engine, initializes required SDL subsystems and creates window
void Engine::init()
{
  SDL_Log("Initializing engine!");
  /* initialize SDL */
  if(SDL_Init(0) != 0){
    Assert(0, "Could not initialize SDL");
  }

  if (SDL_InitSubSystem(SDL_INIT_VIDEO) != 0) {
    Assert(0, "Could not initialize SDL Video");
  }

  if(SDL_InitSubSystem(SDL_INIT_TIMER) != 0){
    Assert(0, "Could not initialize SDL Timer");
  }

  _window = SDL_CreateWindow(NULL, 0, 0, 480, 320, SDL_WINDOW_SHOWN | SDL_WINDOW_FULLSCREEN | SDL_WINDOW_BORDERLESS | SDL_WINDOW_OPENGL);
  Assert(_window, "Could not create window");

  _context = SDL_GL_CreateContext(pimpl->window);
  Assert(_context, "Could not create context");


  SDL_Log("Engine successfully initialized!");
}

//loop
void Engine::updateLoop()
{
  SDL_Event event;
  SDL_Log("Polling events");
  while(SDL_PollEvent(&event)) {
    SDL_Log("Polled event %d", event.type);
  }
}

循环被调用，我在启动时得到 4 个事件:SDL_APP_DIDENTERFOREGROUND、SDL_WINDOWEVENT_SIZE_CHANGED、SDL_WINDOVEVENT_SHOWN 和 SDL_WINDOWEVENT_ENTER；我还收到了输入背景信息之类的信息。但是我可以点击/触摸模拟器/设备，直到奶牛回家，但没有收到任何事件……我错过了什么吗？

Answer 1

在事件得到处理后，我终于能够通过调用 SDL_GL_SwapWindow 来解决它。