Example help needed on how to use 'glx' feature

[Naginipython]

I'm struggling to understand how to use 'glx' in this crate. Looks really cool, I am just struggling to fully figure it out. How do I get the framebuffer properly? How do I set up GLX?

let (conn, screen_num) = x11rb::connect(None)?;
let screen = &conn.setup().roots[screen_num];
let win_id = conn.generate_id()?;
let ctx_id = conn.generate_id()?;
let colormap_id = conn.generate_id()?;

 // Choose framebuffer config. This is wrong?
let fb_configs = glx::get_fb_configs(&conn, screen.root)?.reply()?;
let fb_config = fb_configs.property_list[0];

// Create OpenGL context
glx::create_new_context(&conn, ctx_id, fb_config, screen.root, 0x8014, 0, true)?;
        
// Create colormap
conn.create_colormap(ColormapAlloc::NONE, colormap_id, screen.root, fb_config)?;

let win_aux = &CreateWindowAux::new()
     .background_pixel(screen.white_pixel)
     .event_mask(EventMask::KEY_PRESS)
     .colormap(colormap_id);
conn.create_window(
    COPY_DEPTH_FROM_PARENT,
    win_id,
    screen.root,
    0,
    0,
    width,
    height,
    0,
    WindowClass::INPUT_OUTPUT,
    fb_config,
    &win_aux,
)?;
conn.map_window(win_id)?;
conn.flush()?;
        
glx::make_context_current(&conn, 0, win_id, win_id, ctx_id)?.reply()?;

// What else to do?

'game: loop {
        if let event: Event = conn.wait_for_event().expect("Couldn't get event") {
            match event {
                Event::KeyPress(key) => {
                    match key.detail {
                        9 => break 'game, // Esc
                        _ => {}
                    }
                }
                _ => {}
            }
    }
}

[psychon]

TL;DR: Do not try to use the X11 GLX protocol directly. Use GLX through mesa instead.

Sorry, but the short version is "you do not". I am not 100% sure, but I think you would need the GLX X11 extension if you are implementing GLX. So, e.g. mesa would need this to talk to the X11 server. You would then use "proper GLX" through mesa.

For example, here is a piece of code where mesa uses the GLX X11 extension through XCB: https://gitlab.freedesktop.org/mesa/mesa/-/blob/b7560fa0488a7a72ad0ffa1ad5ca3f7d11257739/src/glx/clientinfo.c#L160-195

Sadly, Google didn't give me anything more useful than this. I think that most of the GLX X11 extension is not even used anymore. The phrase "indirect GLX" comes to mind. Google found that on https://en.wikipedia.org/wiki/AIGLX but that does not really say anything helpful.

[yshui]

I think that most of the GLX X11 extension is not even used anymore.

It's still used for GLX, i.e. creating an OpenGL context via glXCreateContext is done through the GLX extension. OTOH EGL doesn't use it at all.