/* link with -lX11 -lGL */

#include <X11/Xlib.h>
#include <X11/Xlibint.h>
#include <GL/gl.h>
#include <GL/glx.h>
#include <GL/glxproto.h>
#include <stdio.h>
#include <stdlib.h>

int main() {
	Display *dpy;
	int major_opcode;
	int event_base;
	int error_base;
	xGLXCreateContextReq *req;

	dpy = XOpenDisplay(NULL);

	if (!dpy) {
		fprintf(stderr, "XOpenDisplay fail\n");
		exit(1);
	}

	if (!XQueryExtension(dpy, GLX_EXTENSION_NAME, &major_opcode, &event_base, &error_base)) {
		fprintf(stderr, "no " GLX_EXTENSION_NAME " extension\n");
		exit(1);
	}

	LockDisplay(dpy);

	GetReq(GLXCreateContext, req);
	req->reqType = major_opcode;
	req->glxCode = X_GLXCreateContext;
	req->context = XAllocID(dpy);
	req->visual = None;
	req->screen = -1000;
	req->shareList = None;
	req->isDirect = 0;

	UnlockDisplay(dpy);
	SyncHandle();

	XCloseDisplay(dpy);

	exit(0);
}