SDL_Window*   window   = SDL_CreateWindow(title, x, y, w, h, SDL_WINDOW_SHOWN | SDL_WINDOW_OPENGL);
    SDL_Surface*  s        = SDL_GetWindowSurface(window);
    SDL_Renderer* renderer = SDL_CreateRenderer(window,  -1, flags);
    SDL_SetRenderDrawColor(renderer, 0xFF, 0xFF, 0xFF, 0xFF);

SDL_GL_SetAttribute( SDL_GL_CONTEXT_MAJOR_VERSION, 3 );
SDL_GL_SetAttribute( SDL_GL_CONTEXT_MINOR_VERSION, 2 );
//SDL_GL_SetAttribute( SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE );
SDL_Window* window = SDL_CreateWindow( ... );
SDL_GLContext ctx = SDL_GL_CreateContext( window );
SDL_GL_MakeCurrent( window, ctx );
glewExperimental = true;
glewInit();
...