#include <X11/Xlib.h>
#include <GL/glx.h>
#include <unistd.h>


int gltest()
{
    Display* _display;
    Window _windowHandle;
    XVisualInfo* _visual;
    GLXContext _context;
    Atom _deleteWindowMessage;
    Atom _pingWindowMessage;

    _display = XOpenDisplay( NULL );

    int attributes[] = { GLX_RGBA,
                         GLX_DOUBLEBUFFER,
                         GLX_RED_SIZE, 8,
                         GLX_BLUE_SIZE, 8,
                         GLX_GREEN_SIZE, 8,
                         GLX_ALPHA_SIZE, 8,
                         GLX_DEPTH_SIZE, 8,
                         GLX_STENCIL_SIZE, 0,
                         0 };

    _visual = glXChooseVisual( _display,
                               DefaultScreen( _display ),
                               attributes );

    _context = glXCreateContext( _display,
                                 _visual,
                                 0,
                                 GL_TRUE );

    Colormap colormap;

    colormap = XCreateColormap( _display,
                                RootWindow( _display, _visual->screen ),
                                _visual->visual,
                                AllocNone );

    XSetWindowAttributes windowAttributes;

    windowAttributes.colormap = colormap;
    windowAttributes.border_pixel = 0;
    windowAttributes.event_mask = ExposureMask | StructureNotifyMask;


    _windowHandle =
        XCreateWindow( _display,
                       RootWindow( _display, _visual->screen ),
                           0,
                           0,
                           1280,
                           720,
                           0,                      // Borderwidth
                           _visual->depth,         // Depth
                           InputOutput,
                           _visual->visual,
                           CWBorderPixel | CWColormap | CWEventMask,
                           &windowAttributes );
    XFreeColormap( _display, colormap );


    XMapWindow( _display, _windowHandle );

    glXMakeCurrent( _display,
                    _windowHandle,
                    _context );

    sleep( 3 );

    XUnmapWindow( _display, _windowHandle );


    XDestroyWindow( _display, _windowHandle );


    glXMakeCurrent( _display,
                    None,
                    NULL );

    glXDestroyContext( _display, _context );

    XFree( _visual );

    XCloseDisplay( _display );

    return 0;
}