SDL can't create OpenGL windows

Question

So here is my code:

void Game::init()
{
    SDL_Init(SDL_INIT_EVERYTHING);

    _window = SDL_CreateWindow("Game Engine", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, _screenWidth, _screenHeight, SDL_WINDOW_OPENGL);
}

This isn't working for some reason, but it works fine when I replace SDL_WINDOW_OPENGL with something like SDL_WINDOW_RESIZABLE or SDL_WINDOW_FULLSCREEN. It also doesn't work when I use SDL_WINDOW_OPENGL | SDL_WINDOW_FULLSCREEN. Anything I can do?

I'm using Kdevelop with Ubuntu, if that makes any difference.

Update:

So I figured out what was wrong. It turns out that when you build SDL with both GLX and EGL support, it always uses EGL. I had to compile it with --disable-video-opengles

@TristanBrindle it says "No OpenGL support in video driver"... That's weird since I know my driver supports it. — Kash
well, that gives you your answer as to why it's not working... I'd check the installation of your video drivers, or the compilation flags of your SDL library — Tristan Brindle

nasser-sh nasser-sh · Accepted Answer · 2016-03-18T11:01:53

Yes, you most likely do support OpenGL, but which version? On Ubuntu, you can get this information by opening the terminal and typing glxinfo | grep OpenGL, which should give you the highest supported version. After that, you need to set those attributes in SDL. For example, to create an OpenGL 3.3 context:

SDL_Init(SDL_INIT_VIDEO);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 3);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);

Make sure you do this before creating the context or the window.

SDL can't create OpenGL windows

2 Answers