OpenGL and GLX

[Zbynek Winkler <zwin at users dot sourceforge dot net>]

Hello,

Is it possible to compile programs using GLX under cygwin? I am trying 
to compile the attached example with command
g++ -I/usr/X11R6/include -L/usr/X11R6/lib -lX11 -lGL glxsample.cpp -o 
glxsample
All the X and glx functions are reported undefined. Am I doing something 
wrong? I've found the thread in cygwin@cygwin.com list about OpenGL but 
that was about linking to the hw accelerated libs. I need to compile 
program written for the glx. Thanks.

Zbynek

--
<zw at matfyz.cz>
http://zw.matfyz.cz/     http://robotika.cz/
Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic

#include <GL/glx.h> 
#include <GL/gl.h>
#include <unistd.h>


static int attributeList[] = { GLX_RGBA, None };

static Bool WaitForNotify(Display *d, XEvent *e, char *arg) {
    return (e->type == MapNotify) && (e->xmap.window == (Window)arg);
}

int main(int argc, char **argv) {
    Display *dpy;
    XVisualInfo *vi;
    Colormap cmap;
    XSetWindowAttributes swa;
    Window win;
    GLXContext cx;
    XEvent event;

    /* get a connection */
     dpy = XOpenDisplay(0);

    /* get an appropriate visual */
    vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributeList);

    /* create a GLX context */
    cx = glXCreateContext(dpy, vi, 0, GL_TRUE);

    /* create a color map */
    cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen),
                           vi->visual, AllocNone);

    /* create a window */
    swa.colormap = cmap;
    swa.border_pixel = 0;
    swa.event_mask = StructureNotifyMask;
    win = XCreateWindow(dpy, RootWindow(dpy, vi->screen), 0, 0, 100, 100,
                        0, vi->depth, InputOutput, vi->visual,
                        CWBorderPixel|CWColormap|CWEventMask, &swa);
    XMapWindow(dpy, win);
    XIfEvent(dpy, &event, WaitForNotify, (char*)win);

    /* connect the context to the window */
    glXMakeCurrent(dpy, win, cx);

    /* clear the buffer */
    glClearColor(1,1,0,1);
    glClear(GL_COLOR_BUFFER_BIT);
    glFlush();

    /* wait a while */
    sleep(10);
}