Function demo_create_xlib_window

cube/cube.c:2831–2865

#endif
#if defined(VK_USE_PLATFORM_XLIB_KHR)
static void demo_create_xlib_window(struct demo *demo) {
    const char *display_envar = getenv("DISPLAY");
    if (display_envar == NULL || display_envar[0] == '\0') {
        printf("Environment variable DISPLAY requires a valid value.\nExiting ...\n");
        fflush(stdout);
        exit(1);
    }

    XInitThreads();
    demo->xlib_display = XOpenDisplay(NULL);
    long visualMask = VisualScreenMask;
    int numberOfVisuals;
    XVisualInfo vInfoTemplate = {};
    vInfoTemplate.screen = DefaultScreen(demo->xlib_display);
    XVisualInfo *visualInfo = XGetVisualInfo(demo->xlib_display, visualMask, &vInfoTemplate, &numberOfVisuals);

    Colormap colormap =
        XCreateColormap(demo->xlib_display, RootWindow(demo->xlib_display, vInfoTemplate.screen), visualInfo->visual, AllocNone);

    XSetWindowAttributes windowAttributes = {};
    windowAttributes.colormap = colormap;
    windowAttributes.background_pixel = 0xFFFFFFFF;
    windowAttributes.border_pixel = 0;
    windowAttributes.event_mask = KeyPressMask | KeyReleaseMask | StructureNotifyMask | ExposureMask;

    demo->xlib_window = XCreateWindow(demo->xlib_display, RootWindow(demo->xlib_display, vInfoTemplate.screen), 0, 0, demo->width,
                                      demo->height, 0, visualInfo->depth, InputOutput, visualInfo->visual,
                                      CWBackPixel | CWBorderPixel | CWEventMask | CWColormap, &windowAttributes);

    XSelectInput(demo->xlib_display, demo->xlib_window, ExposureMask | KeyPressMask);
    XMapWindow(demo->xlib_display, demo->xlib_window);
    XFlush(demo->xlib_display);
    demo->xlib_wm_delete_window = XInternAtom(demo->xlib_display, "WM_DELETE_WINDOW", False);
    XSetWMProtocols(demo->xlib_display, demo->xlib_window, &demo->xlib_wm_delete_window, 1);
}
static void demo_handle_xlib_event(struct demo *demo, const XEvent *event) {
    switch (event->type) {
        case ClientMessage: