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我正在尝试使用单例模式使用 SDL 和 OpenGL 创建一个简单的窗口，但是当我执行代码时出现一个白色窗口并且 VGA 的使用量也没有增加，任何错误处理程序都没有得到任何东西，这意味着一切正常。

在这里，当我取消 SDL_GetError 注释时，屏幕上出现以下错误：无效窗口，但它只出现在循环中

主文件

#include <SDL2/SDL.h>
#include <glad/glad.h>

class StartScreen
{
public:
  int SCREEN_WIDTH = 800;
  int SCREEN_HEIGHT = 800;

private:
  static StartScreen *sInstance;
  SDL_GLContext context;
  static bool sInitialized;

  SDL_Window *window = nullptr;

public:
  static StartScreen *Instance()
  {
    if (sInstance == nullptr)
    {
      sInstance = new StartScreen();
    }

    return sInstance;
  };
  static void Release()
  {
    delete sInstance;
    sInstance = nullptr;

    sInitialized = false;
  };
  static bool Initialized()
  {
    return sInitialized;
  };

  void Render()
  {
    // SDL_GetWindowSize(window, &SCREEN_WIDTH, &SCREEN_HEIGHT);
    // glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
    glClearColor(250.0f / 255.0f, 119.0f / 255.0f, 110.0f / 255.0f, 1.0f);
    glClearDepth(1.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    SDL_GL_SwapWindow(window);
  };

private:
  StartScreen()
  {
    sInitialized = Init();
  };
  ~StartScreen()
  {
    SDL_DestroyWindow(window);
    SDL_GL_DeleteContext(context);
    window = nullptr;
    SDL_Quit();
  };

  bool Init()
  {
    SDL_Log("%s", SDL_GetError());
    if (SDL_Init(SDL_INIT_EVERYTHING) < 0)
    {
      return false;
    }
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 4);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 6);
    SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
    SDL_Log("%s", SDL_GetError());
    SDL_Window *window = SDL_CreateWindow("Minecraft Clone",
                                          SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
                                          SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
    SDL_Log("%s", SDL_GetError());
    if (window == NULL)
    {
      SDL_Log("Nao foi possivel criar a janela");
      return false;
    }

    context = SDL_GL_CreateContext(window);
    if (context == nullptr)
    {
      SDL_Log("Nao foi possivel inciar o contexto opengl");
    }

    SDL_Log("%s", SDL_GetError());
    if (!gladLoadGLLoader((GLADloadproc)SDL_GL_GetProcAddress))
    {
      SDL_Log("Falha ao iniciar o glad");
      return false;
    }

    glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
    SDL_Log("%s", SDL_GetError());
    return true;
  };
};

StartScreen *StartScreen::sInstance = nullptr;
bool StartScreen::sInitialized = false;

class Manager
{
private:
  static Manager *sInstance;
  bool mQuit;
  StartScreen *mStart;

  SDL_Event mEvents;

public:
  static Manager *Instance()
  {
    if (sInstance == nullptr)
      sInstance = new Manager();
    SDL_Log("%s", SDL_GetError());
    return sInstance;
  };
  static void Release()
  {
    delete sInstance;
    sInstance = nullptr;
  };

  void Run()
  {
    while (!mQuit)
    {
      if (SDL_PollEvent(&mEvents))
      {
        if (mEvents.type == SDL_QUIT)
        {
          mQuit = true;
          return;
        }
      }
      mStart->Render();
      SDL_Log("%s", SDL_GetError());
    }
  };

private:
  Manager()
  {
    mQuit = false;
    mStart = StartScreen::Instance();
    SDL_Log("%s", SDL_GetError());
  };
  ~Manager()
  {
    Manager::Release();
    mStart = nullptr;
  };
};

Manager *Manager::sInstance = nullptr;

int SDL_main(int argc, char *argv[])
{
  Manager *game = Manager::Instance();
  game->Run();

  Manager::Release();
  game = nullptr;

  return 0;
}
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1 回答 1

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在渲染函数上，我只需要将引用SDL_GL_SwapWindow(window)StartScreen 类的窗口的 SDL_GL_SwapWindow 引用更改为SDL_GL_SwapWindow(SDL_GL_GetCurrentWindow()). 我相信引用已经丢失，因为这个函数只是在其他类（Manager）中使用，所以这种方式在框架的实习生中是全局的

于 2021-12-28T14:25:14.790 回答