Added a test case for Mesa bug #508473 that I wrote a long time ago.

Fixed the Makefile.X11 to actually build glxgears_fbconfig when
invoked from the top level.

progs/xdemos/Makefile.X11

@@ -26,7 +26,9 @@ PROGS = glthreads \
 	wincopy \
 	xdemo \
 	xfont \
-	xrotfontdemo
+	xrotfontdemo \
+	glxgears_fbconfig \
+	opencloseopen
 
 
 

progs/xdemos/opencloseopen.c

@@ -0,0 +1,189 @@
+/*
+ * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
+ * (C) Copyright IBM Corporation 2003
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included
+ * in all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <X11/Xlib.h>
+#include <GL/gl.h>
+#include <GL/glx.h>
+
+/** \file opencloseopen.c
+ * Simple test for Mesa bug #508473.  Create a window and rendering context.
+ * Draw a single frame.  Close the window, destroy the context, and close
+ * the display.  Re-open the display, create a new window and context.  This
+ * should work, but, at least as of Mesa 5.1, it segfaults.  See the bug
+ * report for more details.
+ * 
+ * Most of the code here was lifed from various other Mesa xdemos.
+ */
+
+static void
+draw(void)
+{
+   glViewport(0, 0, 300, 300);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glOrtho(-1.0, 1.0, -1.0, 1.0, -1.0, 1.0);
+   glMatrixMode(GL_MODELVIEW);
+
+   glShadeModel(GL_FLAT);
+   glClearColor(0.5, 0.5, 0.5, 1.0);
+   glClear(GL_COLOR_BUFFER_BIT);
+
+   /* draw blue quad */
+   glLoadIdentity();
+   glColor3f(0.3, 0.3, 1.0);
+   glPushMatrix();
+   glRotatef(0, 0, 0, 1);
+   glBegin(GL_POLYGON);
+   glVertex2f(-0.5, -0.25);
+   glVertex2f( 0.5, -0.25);
+   glVertex2f( 0.5, 0.25);
+   glVertex2f(-0.5, 0.25);
+   glEnd();
+   glPopMatrix();}
+
+
+/*
+ * Create an RGB, double-buffered window.
+ * Return the window and context handles.
+ */
+static void
+make_window( const char * dpyName, const char *name,
+             int x, int y, int width, int height,
+	     Display **dpyRet, Window *winRet, GLXContext *ctxRet)
+{
+   int attrib[] = { GLX_RGBA,
+		    GLX_RED_SIZE, 1,
+		    GLX_GREEN_SIZE, 1,
+		    GLX_BLUE_SIZE, 1,
+		    GLX_DOUBLEBUFFER,
+		    None };
+   int scrnum;
+   XSetWindowAttributes attr;
+   unsigned long mask;
+   Window root;
+   Window win;
+   GLXContext ctx;
+   XVisualInfo *visinfo;
+   Display *dpy;
+
+   dpy = XOpenDisplay(dpyName);
+   if (!dpy) {
+      printf("Error: couldn't open display %s\n", dpyName);
+      exit(1);
+   }
+
+   *dpyRet = dpy;
+   scrnum = DefaultScreen( dpy );
+   root = RootWindow( dpy, scrnum );
+
+   visinfo = glXChooseVisual( dpy, scrnum, attrib );
+   if (!visinfo) {
+      printf("Error: couldn't get an RGB, Double-buffered visual\n");
+      exit(1);
+   }
+
+   /* window attributes */
+   attr.background_pixel = 0;
+   attr.border_pixel = 0;
+   attr.colormap = XCreateColormap( dpy, root, visinfo->visual, AllocNone);
+   attr.event_mask = StructureNotifyMask | ExposureMask | KeyPressMask;
+   mask = CWBackPixel | CWBorderPixel | CWColormap | CWEventMask;
+
+   win = XCreateWindow( dpy, root, 0, 0, width, height,
+		        0, visinfo->depth, InputOutput,
+		        visinfo->visual, mask, &attr );
+
+   /* set hints and properties */
+   {
+      XSizeHints sizehints;
+      sizehints.x = x;
+      sizehints.y = y;
+      sizehints.width  = width;
+      sizehints.height = height;
+      sizehints.flags = USSize | USPosition;
+      XSetNormalHints(dpy, win, &sizehints);
+      XSetStandardProperties(dpy, win, name, name,
+                              None, (char **)NULL, 0, &sizehints);
+   }
+
+   ctx = glXCreateContext( dpy, visinfo, NULL, True );
+   if (!ctx) {
+      printf("Error: glXCreateContext failed\n");
+      exit(1);
+   }
+
+   XFree(visinfo);
+
+   *winRet = win;
+   *ctxRet = ctx;
+}
+
+
+static void
+destroy_window( Display *dpy, Window win, GLXContext ctx )
+{
+   glXMakeCurrent(dpy, None, NULL);
+   glXDestroyContext(dpy, ctx);
+   XDestroyWindow(dpy, win);
+   XCloseDisplay(dpy);
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   Display *dpy;
+   Window win;
+   GLXContext ctx;
+   char *dpyName = ":0";
+   int i;
+
+   for (i = 1; i < argc; i++) {
+      if (strcmp(argv[i], "-display") == 0) {
+         dpyName = argv[i+1];
+         i++;
+      }
+   }
+
+   printf("If this program segfaults, then Mesa bug #508473 is probably "
+	  "back.\n");
+   make_window(dpyName, "Open-close-open", 0, 0, 300, 300, &dpy, &win, &ctx);
+   XMapWindow(dpy, win);
+   glXMakeCurrent(dpy, win, ctx);
+
+   draw();
+   glXSwapBuffers(dpy, win);
+   sleep(2);
+
+   destroy_window(dpy, win, ctx);
+
+   make_window(dpyName, "Open-close-open", 0, 0, 300, 300, &dpy, &win, &ctx);
+   XMapWindow(dpy, win);
+   glXMakeCurrent(dpy, win, ctx);
+   destroy_window(dpy, win, ctx);
+
+   return 0;
+}