LCOV - code coverage report
Current view: directory - toolkit/xre - glxtest.cpp (source / functions) Found Hit Coverage
Test: app.info Lines: 91 41 45.1 %
Date: 2012-06-02 Functions: 14 13 92.9 %

       1                 : /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
       2                 :  * vim: sw=2 ts=8 et :
       3                 :  */
       4                 : /* ***** BEGIN LICENSE BLOCK *****
       5                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
       6                 :  *
       7                 :  * The contents of this file are subject to the Mozilla Public License Version
       8                 :  * 1.1 (the "License"); you may not use this file except in compliance with
       9                 :  * the License. You may obtain a copy of the License at:
      10                 :  * http://www.mozilla.org/MPL/
      11                 :  *
      12                 :  * Software distributed under the License is distributed on an "AS IS" basis,
      13                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
      14                 :  * for the specific language governing rights and limitations under the
      15                 :  * License.
      16                 :  *
      17                 :  * The Original Code is Mozilla Code.
      18                 :  *
      19                 :  * The Initial Developer of the Original Code is
      20                 :  *   The Mozilla Foundation
      21                 :  * Portions created by the Initial Developer are Copyright (C) 2010
      22                 :  * the Initial Developer. All Rights Reserved.
      23                 :  *
      24                 :  * Contributor(s):
      25                 :  *
      26                 :  * Alternatively, the contents of this file may be used under the terms of
      27                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
      28                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
      29                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
      30                 :  * of those above. If you wish to allow use of your version of this file only
      31                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
      32                 :  * use your version of this file under the terms of the MPL, indicate your
      33                 :  * decision by deleting the provisions above and replace them with the notice
      34                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
      35                 :  * the provisions above, a recipient may use your version of this file under
      36                 :  * the terms of any one of the MPL, the GPL or the LGPL.
      37                 :  *
      38                 :  * ***** END LICENSE BLOCK ***** */
      39                 : 
      40                 : 
      41                 : //////////////////////////////////////////////////////////////////////////////
      42                 : //
      43                 : // Explanation: See bug 639842. Safely getting GL driver info on X11 is hard, because the only way to do
      44                 : // that is to create a GL context and call glGetString(), but with bad drivers,
      45                 : // just creating a GL context may crash.
      46                 : //
      47                 : // This file implements the idea to do that in a separate process.
      48                 : //
      49                 : // The only non-static function here is fire_glxtest_process(). It creates a pipe, publishes its 'read' end as the
      50                 : // mozilla::widget::glxtest_pipe global variable, forks, and runs that GLX probe in the child process,
      51                 : // which runs the glxtest() static function. This creates a X connection, a GLX context, calls glGetString, and writes that
      52                 : // to the 'write' end of the pipe.
      53                 : 
      54                 : #include <cstdio>
      55                 : #include <cstdlib>
      56                 : #include <unistd.h>
      57                 : #include <GL/gl.h>
      58                 : #include <GL/glx.h>
      59                 : #include <dlfcn.h>
      60                 : #include "nscore.h"
      61                 : 
      62                 : #include <fcntl.h>
      63                 : 
      64                 : #ifdef __SUNPRO_CC
      65                 : #include <stdio.h>
      66                 : #endif
      67                 : 
      68                 : namespace mozilla {
      69                 : namespace widget {
      70                 : // the read end of the pipe, which will be used by GfxInfo
      71                 : extern int glxtest_pipe;
      72                 : // the PID of the glxtest process, to pass to waitpid()
      73                 : extern pid_t glxtest_pid;
      74                 : }
      75                 : }
      76                 : 
      77                 : // the write end of the pipe, which we're going to write to
      78                 : static int write_end_of_the_pipe = -1;
      79                 : 
      80                 : // C++ standard collides with C standard in that it doesn't allow casting void* to function pointer types.
      81                 : // So the work-around is to convert first to size_t.
      82                 : // http://www.trilithium.com/johan/2004/12/problem-with-dlsym/
      83                 : template<typename func_ptr_type>
      84             253 : static func_ptr_type cast(void *ptr)
      85                 : {
      86                 :   return reinterpret_cast<func_ptr_type>(
      87                 :            reinterpret_cast<size_t>(ptr)
      88             253 :          );
      89                 : }
      90                 : 
      91              23 : static void fatal_error(const char *str)
      92                 : {
      93              23 :   write(write_end_of_the_pipe, str, strlen(str));
      94              23 :   write(write_end_of_the_pipe, "\n", 1);
      95              23 :   exit(EXIT_FAILURE);
      96                 : }
      97                 : 
      98                 : static int
      99               0 : x_error_handler(Display *, XErrorEvent *ev)
     100                 : {
     101                 :   enum { bufsize = 1024 };
     102                 :   char buf[bufsize];
     103                 :   int length = snprintf(buf, bufsize,
     104                 :                         "X error occurred in GLX probe, error_code=%d, request_code=%d, minor_code=%d\n",
     105                 :                         ev->error_code,
     106                 :                         ev->request_code,
     107               0 :                         ev->minor_code);
     108               0 :   write(write_end_of_the_pipe, buf, length);
     109               0 :   exit(EXIT_FAILURE);
     110                 :   return 0;
     111                 : }
     112                 : 
     113              23 : static void glxtest()
     114                 : {
     115                 :   // we want to redirect to /dev/null stdout, stderr, and while we're at it,
     116                 :   // any PR logging file descriptors. To that effect, we redirect all positive
     117                 :   // file descriptors up to what open() returns here. In particular, 1 is stdout and 2 is stderr.
     118              23 :   int fd = open("/dev/null", O_WRONLY);
     119              71 :   for (int i = 1; i < fd; i++)
     120              48 :     dup2(fd, i);
     121              23 :   close(fd);
     122                 : 
     123                 :   ///// Open libGL and load needed symbols /////
     124                 : #ifdef __OpenBSD__
     125                 :   #define LIBGL_FILENAME "libGL.so"
     126                 : #else
     127                 :   #define LIBGL_FILENAME "libGL.so.1"
     128                 : #endif
     129              23 :   void *libgl = dlopen(LIBGL_FILENAME, RTLD_LAZY);
     130              23 :   if (!libgl)
     131               0 :     fatal_error("Unable to load " LIBGL_FILENAME);
     132                 :   
     133                 :   typedef void* (* PFNGLXGETPROCADDRESS) (const char *);
     134              23 :   PFNGLXGETPROCADDRESS glXGetProcAddress = cast<PFNGLXGETPROCADDRESS>(dlsym(libgl, "glXGetProcAddress"));
     135                 :   
     136              23 :   if (!glXGetProcAddress)
     137               0 :     fatal_error("Unable to find glXGetProcAddress in " LIBGL_FILENAME);
     138                 : 
     139                 :   typedef GLXFBConfig* (* PFNGLXQUERYEXTENSION) (Display *, int *, int *);
     140              23 :   PFNGLXQUERYEXTENSION glXQueryExtension = cast<PFNGLXQUERYEXTENSION>(glXGetProcAddress("glXQueryExtension"));
     141                 : 
     142                 :   typedef GLXFBConfig* (* PFNGLXQUERYVERSION) (Display *, int *, int *);
     143              23 :   PFNGLXQUERYVERSION glXQueryVersion = cast<PFNGLXQUERYVERSION>(dlsym(libgl, "glXQueryVersion"));
     144                 : 
     145                 :   typedef GLXFBConfig* (* PFNGLXCHOOSEFBCONFIG) (Display *, int, const int *, int *);
     146              23 :   PFNGLXCHOOSEFBCONFIG glXChooseFBConfig = cast<PFNGLXCHOOSEFBCONFIG>(glXGetProcAddress("glXChooseFBConfig"));
     147                 : 
     148                 :   typedef XVisualInfo* (* PFNGLXGETVISUALFROMFBCONFIG) (Display *, GLXFBConfig);
     149              23 :   PFNGLXGETVISUALFROMFBCONFIG glXGetVisualFromFBConfig = cast<PFNGLXGETVISUALFROMFBCONFIG>(glXGetProcAddress("glXGetVisualFromFBConfig"));
     150                 : 
     151                 :   typedef GLXPixmap (* PFNGLXCREATEPIXMAP) (Display *, GLXFBConfig, Pixmap, const int *);
     152              23 :   PFNGLXCREATEPIXMAP glXCreatePixmap = cast<PFNGLXCREATEPIXMAP>(glXGetProcAddress("glXCreatePixmap"));
     153                 : 
     154                 :   typedef GLXContext (* PFNGLXCREATENEWCONTEXT) (Display *, GLXFBConfig, int, GLXContext, Bool);
     155              23 :   PFNGLXCREATENEWCONTEXT glXCreateNewContext = cast<PFNGLXCREATENEWCONTEXT>(glXGetProcAddress("glXCreateNewContext"));
     156                 : 
     157                 :   typedef Bool (* PFNGLXMAKECURRENT) (Display*, GLXDrawable, GLXContext);
     158              23 :   PFNGLXMAKECURRENT glXMakeCurrent = cast<PFNGLXMAKECURRENT>(glXGetProcAddress("glXMakeCurrent"));
     159                 : 
     160                 :   typedef void (* PFNGLXDESTROYPIXMAP) (Display *, GLXPixmap);
     161              23 :   PFNGLXDESTROYPIXMAP glXDestroyPixmap = cast<PFNGLXDESTROYPIXMAP>(glXGetProcAddress("glXDestroyPixmap"));
     162                 : 
     163                 :   typedef void (* PFNGLXDESTROYCONTEXT) (Display*, GLXContext);
     164              23 :   PFNGLXDESTROYCONTEXT glXDestroyContext = cast<PFNGLXDESTROYCONTEXT>(glXGetProcAddress("glXDestroyContext"));
     165                 : 
     166                 :   typedef GLubyte* (* PFNGLGETSTRING) (GLenum);
     167              23 :   PFNGLGETSTRING glGetString = cast<PFNGLGETSTRING>(glXGetProcAddress("glGetString"));
     168                 : 
     169              23 :   if (!glXQueryExtension ||
     170                 :       !glXQueryVersion ||
     171                 :       !glXChooseFBConfig ||
     172                 :       !glXGetVisualFromFBConfig ||
     173                 :       !glXCreatePixmap ||
     174                 :       !glXCreateNewContext ||
     175                 :       !glXMakeCurrent ||
     176                 :       !glXDestroyPixmap ||
     177                 :       !glXDestroyContext ||
     178                 :       !glGetString)
     179                 :   {
     180               0 :     fatal_error("glXGetProcAddress couldn't find required functions");
     181                 :   }
     182                 :   ///// Open a connection to the X server /////
     183              23 :   Display *dpy = XOpenDisplay(NULL);
     184              23 :   if (!dpy)
     185              23 :     fatal_error("Unable to open a connection to the X server");
     186                 :   
     187                 :   ///// Check that the GLX extension is present /////
     188               0 :   if (!glXQueryExtension(dpy, NULL, NULL))
     189               0 :     fatal_error("GLX extension missing");
     190                 :   
     191                 :   ///// Check that the GLX version is >= 1.3, needed for glXCreatePixmap, bug 659932 /////
     192                 :   int majorVersion, minorVersion;
     193               0 :   if (!glXQueryVersion(dpy, &majorVersion, &minorVersion))
     194               0 :     fatal_error("Unable to query GLX version");
     195                 : 
     196               0 :   if (majorVersion < 1 || (majorVersion == 1 && minorVersion < 3))
     197               0 :     fatal_error("GLX version older than the required 1.3");
     198                 : 
     199               0 :   XSetErrorHandler(x_error_handler);
     200                 : 
     201                 :   ///// Get a FBConfig and a visual /////
     202                 :   int attribs[] = {
     203                 :     GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT,
     204                 :     GLX_X_RENDERABLE, True,
     205                 :     0
     206               0 :   };
     207                 :   int numReturned;
     208               0 :   GLXFBConfig *fbConfigs = glXChooseFBConfig(dpy, DefaultScreen(dpy), attribs, &numReturned );
     209               0 :   if (!fbConfigs)
     210               0 :     fatal_error("No FBConfigs found");
     211               0 :   XVisualInfo *vInfo = glXGetVisualFromFBConfig(dpy, fbConfigs[0]);
     212               0 :   if (!vInfo)
     213               0 :     fatal_error("No visual found for first FBConfig");
     214                 : 
     215                 :   ///// Get a Pixmap and a GLXPixmap /////
     216               0 :   Pixmap pixmap = XCreatePixmap(dpy, RootWindow(dpy, vInfo->screen), 4, 4, vInfo->depth);
     217               0 :   GLXPixmap glxpixmap = glXCreatePixmap(dpy, fbConfigs[0], pixmap, NULL);
     218                 : 
     219                 :   ///// Get a GL context and make it current //////
     220               0 :   GLXContext context = glXCreateNewContext(dpy, fbConfigs[0], GLX_RGBA_TYPE, NULL, True);
     221               0 :   glXMakeCurrent(dpy, glxpixmap, context);
     222                 : 
     223                 :   ///// Look for this symbol to determine texture_from_pixmap support /////
     224               0 :   void* glXBindTexImageEXT = glXGetProcAddress("glXBindTexImageEXT"); 
     225                 : 
     226                 :   ///// Get GL vendor/renderer/versions strings /////
     227                 :   enum { bufsize = 1024 };
     228                 :   char buf[bufsize];
     229               0 :   const GLubyte *vendorString = glGetString(GL_VENDOR);
     230               0 :   const GLubyte *rendererString = glGetString(GL_RENDERER);
     231               0 :   const GLubyte *versionString = glGetString(GL_VERSION);
     232                 :   
     233               0 :   if (!vendorString || !rendererString || !versionString)
     234               0 :     fatal_error("glGetString returned null");
     235                 : 
     236                 :   int length = snprintf(buf, bufsize,
     237                 :                         "VENDOR\n%s\nRENDERER\n%s\nVERSION\n%s\nTFP\n%s\n",
     238                 :                         vendorString,
     239                 :                         rendererString,
     240                 :                         versionString,
     241               0 :                         glXBindTexImageEXT ? "TRUE" : "FALSE");
     242               0 :   if (length >= bufsize)
     243               0 :     fatal_error("GL strings length too large for buffer size");
     244                 : 
     245                 :   ///// Clean up. Indeed, the parent process might fail to kill us (e.g. if it doesn't need to check GL info)
     246                 :   ///// so we might be staying alive for longer than expected, so it's important to consume as little memory as
     247                 :   ///// possible. Also we want to check that we're able to do that too without generating X errors.
     248               0 :   glXMakeCurrent(dpy, None, NULL); // must release the GL context before destroying it
     249               0 :   glXDestroyContext(dpy, context);
     250               0 :   glXDestroyPixmap(dpy, glxpixmap);
     251               0 :   XFreePixmap(dpy, pixmap);
     252               0 :   XCloseDisplay(dpy);
     253               0 :   dlclose(libgl);
     254                 : 
     255                 :   ///// Finally write data to the pipe
     256               0 :   write(write_end_of_the_pipe, buf, length);
     257               0 : }
     258                 : 
     259                 : /** \returns true in the child glxtest process, false in the parent process */
     260              23 : bool fire_glxtest_process()
     261                 : {
     262                 :   int pfd[2];
     263              23 :   if (pipe(pfd) == -1) {
     264               0 :       perror("pipe");
     265               0 :       return false;
     266                 :   }
     267              23 :   pid_t pid = fork();
     268              46 :   if (pid < 0) {
     269               0 :       perror("fork");
     270               0 :       close(pfd[0]);
     271               0 :       close(pfd[1]);
     272               0 :       return false;
     273                 :   }
     274              46 :   if (pid == 0) {
     275              23 :       close(pfd[0]);
     276              23 :       write_end_of_the_pipe = pfd[1];
     277              23 :       glxtest();
     278               0 :       close(pfd[1]);
     279               0 :       return true;
     280                 :   }
     281                 : 
     282              23 :   close(pfd[1]);
     283              23 :   mozilla::widget::glxtest_pipe = pfd[0];
     284              23 :   mozilla::widget::glxtest_pid = pid;
     285              23 :   return false;
     286                 : }

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