[笔记]音视频学习之SDL篇《四》事件驱动的编程

int iW, iH;
  SDL_QueryTexture(image, NULL, NULL, &iW, &iH);
  int x = SCREEN_WIDTH / 2 - iW / 2;
  int y = SCREEN_HEIGHT / 2 - iH / 2;

//Our event union
  SDL_Event e;
  //For tracking if we want to quit
  bool quit = false;
  while (!quit) {
    //Read any events that occured, for now we'll just quit if any event occurs
    while (SDL_PollEvent(&e)) {
      //If user closes the window
      if (e.type == SDL_QUIT) {
        quit = true;
      }
      //If user presses any key
      if (e.type == SDL_KEYDOWN) {
        quit = true;
      }
      //If user clicks the mouse
      if (e.type == SDL_MOUSEBUTTONDOWN) {
        quit = true;
      }
    }
    //Rendering
    SDL_RenderClear(renderer);
    //Draw the image
    renderTexture(image, renderer, x, y);
    //Update the screen
    SDL_RenderPresent(renderer);
  }