/*
 * Reproducer for a Xorg crash with indirect GLX due to incorrect GL dispatch
 * Written by Michal Schmidt <mschmidt@redhat.com>
 * Copyright 2014 Red Hat, Inc.
 *
 * Permission is hereby granted, without written agreement and without
 * license or royalty fees, to use, copy, modify, and distribute this
 * software and its documentation for any purpose, provided that the
 * above copyright notice and the following two paragraphs appear in
 * all copies of this software.
 * 
 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
 * DAMAGE.
 * 
 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
 *
 *
 * Install build dependencies (on Fedora):
 *   yum install freeglut-devel
 * Build:
 *   gcc -lGL -lglut -o glxcrash glxcrash.c
 * Run:
 *   ./glxcrash -indirect
 */

#include <stdio.h>
#include <GL/gl.h>
#include <GL/freeglut.h>

static void draw(void)
{
	static const unsigned char *msg = (unsigned char*)
		"If you can see this, it did not crash.";

	/* crash! (not because of nonsense arguments, but because of
	 * bad GL indirection table in Xorg process) */
	glCompressedTexImage2D(0, 0, 0, 0, 0, 0, 5, "Hello");

	glClear(GL_COLOR_BUFFER_BIT);
	glRasterPos2f(-0.9,0);
	glutBitmapString(GLUT_BITMAP_HELVETICA_18, msg);
	glutSwapBuffers();
}

int main(int argc, char **argv)
{
	int win;

	glutInitWindowSize(350, 100);
	glutInit(&argc, argv);

	win = glutCreateWindow("glxcrash");
	if (!win) {
		fprintf(stderr, "glutCreateWindow failed\n");
		return 1;
	}

	glutDisplayFunc(draw);
	glutMainLoop();

	return 0;
}