我制作了一个程序，它具有两种不同的状态，一种用于菜单显示-“菜单状态”，另一种状态用于绘制某些内容-“绘制状态”。
但是我碰到一个奇怪的事情，如果我加载某些png的纹理并将其复制到渲染器进行显示，然后离开“ Menu State”进入“ Draw State”。纹理将以某种方式使矩形颜色无法正确显示（例如，使绿色变暗）。
在我的代码中，切换到新状态（调用MenuState :: onExit（））将擦除纹理贴图（使用std :: string进行纹理智能指针索引的贴图）
因此，加载的texutre甚至在“绘图状态”中都不存在。
 我不知道出了什么问题。这是我的一些代码

void TextureManager::DrawPixel(int x,int y,int width,int height,SDL_Renderer *pRenderer)
{
    SDL_Rect rect;
    rect.x = x;
    rect.y = y;
    rect.w = width;
    rect.h = height;

    SDL_SetRenderDrawColor(pRenderer,255,255);//same color value
    SDL_RenderFillRect(pRenderer,&rect);
}

static bool TextureManagerLoadFile(std::string filename,std::string id)
{
    return TextureManager::Instance().Load(filename,id,Game::Instance().GetRenderer());
}

bool TextureManager::Load(std::string filename,std::string id,SDL_Renderer *pRenderer)
{
    if(m_textureMap.count(id) != 0)
    {
        return false;
    }
    SDL_Surface *pTempSurface = IMG_Load(filename.c_str());
    SDL_Texture *pTexutre = SDL_CreateTextureFromSurface(pRenderer,pTempSurface);
    SDL_FreeSurface(pTempSurface);
    if(pTexutre != 0)
    {
        m_textureMap[id] = std::make_unique<textureData>(pTexutre,0);
        SDL_QueryTexture(pTexutre,NULL,&m_textureMap[id]->width,&m_textureMap[id]->height);
        return true;
    }
    return false;
}


void TextureManager::ClearFromTextureMap(std::string textureID)
{
    m_textureMap.erase(textureID);
}

bool MenuState::onEnter()
{
    if(!TextureManagerLoadFile("assets/Main menu/BTN PLAY.png","play_button"))
    {
        return false;
    }
    if(!TextureManagerLoadFile("assets/Main menu/BTN Exit.png","exit_button"))
    //replace different png file here will also affect the outcome
    {
        return false;
    }
    if(!TextureManagerLoadFile("assets/Main menu/BTN SETTINGS.png","setting_button"))
    {
        return false;
    }
    int client_w,client_h;
    SDL_GetWindowSize(Game::Instance().getclientWindow(),&client_w,&client_h);
    int playBtn_w = TextureManager::Instance().GetTextureWidth("play_button");
    int playBtn_h = TextureManager::Instance().GetTuextureHeight("play_button");
    int center_x = (client_w - playBtn_w) / 2;
    int center_y = (client_h - playBtn_h) / 2;
    ParamsLoader pPlayParams(center_x,center_y,playBtn_w,playBtn_h,"play_button");

    int settingBtn_w = TextureManager::Instance().GetTextureWidth("setting_button");
    int settingBtn_h = TextureManager::Instance().GetTuextureHeight("setting_button");
    ParamsLoader pSettingParams(center_x,center_y + (playBtn_h + settingBtn_h) / 2,settingBtn_w,settingBtn_h,"setting_button");

    int exitBtn_w = TextureManager::Instance().GetTextureWidth("exit_button");
    int exitBtn_h = TextureManager::Instance().GetTuextureHeight("exit_button");
    ParamsLoader pExitParams(10,10,exitBtn_w,exitBtn_h,"exit_button");

    m_gameObjects.push_back(std::make_shared<MenuUIObject>(&pPlayParams,s_menuToPlay));
    m_gameObjects.push_back(std::make_shared<MenuUIObject>(&pSettingParams,s_menuToPlay));
    m_gameObjects.push_back(std::make_shared<MenuUIObject>(&pExitParams,s_menuExit));
    //change order of the 3 line code above
    //or replace different png for exit button,will make the rectangle color different

    std::cout << "Entering Menu State" << std::endl;
    return true;
}

bool MenuState::onExit()
{
    for(auto i : m_gameObjects)
    {
       i->Clean();
    }
    m_gameObjects.clear();
    TextureManager::Instance().ClearFromTextureMap("play_button");
    TextureManager::Instance().ClearFromTextureMap("exit_button");
    TextureManager::Instance().ClearFromTextureMap("setting_button");
    std::cout << "Exiting Menu State" << std::endl;
    return true;
}

void Game::Render()
{
    SDL_SetRenderDrawColor(m_pRenderer,255);
    SDL_RenderClear(m_pRenderer);
    m_pGameStateMachine->Render();
    SDL_RenderPresent(m_pRenderer);
}

Menu State Figure
Correct Color
Wrong Color

编辑：此外，我发现这种奇怪的现象仅在使用'SDL_RENDERER_accELERATED'标志和-1或0驱动程序索引（即SDL_CreateRenderer(m_pWindow,1,SDL_RENDERER_accELERATED);或{{ 1}}工作正常！