progs/xdemos/opencloseopen.c

/*
 * 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;
}