SDL_net没有opengl上下文

Question

我正在关注SDL_net上的教程，对于我的程序崩溃的原因感到十分困惑。你可以找到教程here.我的客户端在服务器打开的情况下运行后崩溃。

我只是想知道这是什么错误的手段（使用SDLNet_GetError（））：我只是工作

no opengl context has been made 

关闭核心SDL与SDL_TTF，而且不知道这意味着什么。我遵循的教程示例使用了OpenGL，因此如果我猜测错误是因为我没有使用它而造成的？我只是假定它只需要SDL。

如果你想看看代码，你可以找到client code here，和server code here。我不打算把这个问题放在这个问题上，因为它很长，我只需简单地解释一下错误就可以了，我不想要求我的代码有什么问题的完整解释。

好了，所以我的初始化代码通过屏幕管理做到：

#include "ScreenManager.h" 

ScreenManager &ScreenManager::GetInstance(){ 
    static ScreenManager instance; 
    return instance; 
} 

void ScreenManager::init(){ 
    SDL_Init(SDL_INIT_EVERYTHING); 
    TTF_Init(); 
    SDLNet_Init(); 

    window = SDL_CreateWindow("Game", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1920, 1080, SDL_WINDOW_BORDERLESS); 
    renderer = SDL_CreateRenderer(window, 0, SDL_RENDERER_ACCELERATED); 

    running = true; 

    ResourceManager::GetInstance().loadTexture(renderer, "res/Human.bmp", "player"); 
    ResourceManager::GetInstance().loadTexture(renderer, "res/space.bmp", "background"); 
    ResourceManager::GetInstance().loadTexture(renderer, "res/ship.bmp", "ship"); 
    ResourceManager::GetInstance().loadTexture(renderer, "res/interior.bmp", "interior"); 

    SDL_GL_SetSwapInterval(1); 

    GameManager::GetInstance().init(); 

    currentScreen = new MainScreen(); 
    currentScreen->init(); 
} 

void ScreenManager::close(){ 
    ResourceManager::GetInstance().close(); 
    currentScreen->close(); 

    SDL_DestroyWindow(window); 
    SDL_DestroyRenderer(renderer); 

    SDL_Quit(); 
    SDLNet_Quit(); 
    TTF_Quit(); 
} 

void ScreenManager::update(){ 
    currentScreen->update(); 
} 

void ScreenManager::render(){ 
    SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0); 
    SDL_RenderClear(renderer); 

    currentScreen->render(renderer); 

    SDL_RenderPresent(renderer); 
} 

void ScreenManager::setScreen(GameScreen *screenToSet){ 
    currentScreen->close(); 
    currentScreen = screenToSet; 
    currentScreen->init(); 
} 

void ScreenManager::handleEvents(){ 
    SDL_Event e; 
    while(SDL_PollEvent(&e) > 0){ 
     switch(e.type){ 
      case SDL_QUIT: 
       running = false; 
      break; 
     } 
    } 
} 

bool ScreenManager::isRunning(){ 
    return running; 
} 

它是运行屏幕，这是在网络上运行：

#include "MainScreen.h" 

void MainScreen::init(){ 
    Network = new network(); 
    Network->init(); 

    player = new Player((1920/2) - 32, (1080/2) - 32); 
    background = new Background(); 
    entity_vector.push_back(new Ship(30, 30, 699*4, 444*4, 0, "ship", "interior")); 
} 

void MainScreen::close(){ 
    Network->close(); 
    for(unsigned i = 0; i < entity_vector.size(); i++){ 
     entity_vector[i]->close(); 
    } 
    player->close(); 
} 

void MainScreen::update(){ 
    for(unsigned i = 0; i < entity_vector.size(); i++){ 
     entity_vector[i]->update(); 
    } 
    player->update((1920/2) - 32, (1080/2) - 32); 

    GameManager::GetInstance().update(); 
    Network->recv(enemies, player); 
    Network->send(player); 
} 

void MainScreen::render(SDL_Renderer *renderer){ 
    for(unsigned i = 0; i < entity_vector.size(); i++){ 
     entity_vector[i]->render(renderer); 
    } 
    for(unsigned i = 0; i < enemies.size(); i++){ 
     enemies[i]->render(renderer); 
    } 
    background->render(renderer); 
    player->render(renderer); 
} 

Answer 1

你不是在创造OpenGL上下文并根据source调用SDL_GL_SetSwapInterval(1);将错误设置为No OpenGL context has been made current。然后在您的void network::send(Player *p)中，您没有明显的原因致电SDLNet_GetError()，并获得该错误。我想你应该在SDL_CreateWindow之后致电SDL_GL_CreateContext。