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282 lines
10 KiB
C++
282 lines
10 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=8 et :
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Code.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2010
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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//////////////////////////////////////////////////////////////////////////////
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//
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// Explanation: See bug 639842. Safely getting GL driver info on X11 is hard, because the only way to do
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// that is to create a GL context and call glGetString(), but with bad drivers,
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// just creating a GL context may crash.
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//
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// This file implements the idea to do that in a separate process.
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//
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// The only non-static function here is fire_glxtest_process(). It creates a pipe, publishes its 'read' end as the
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// mozilla::widget::glxtest_pipe global variable, forks, and runs that GLX probe in the child process,
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// which runs the glxtest() static function. This creates a X connection, a GLX context, calls glGetString, and writes that
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// to the 'write' end of the pipe.
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#include <cstdio>
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#include <cstdlib>
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#include <unistd.h>
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#include <GL/gl.h>
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#include <GL/glx.h>
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#include <dlfcn.h>
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#include "nscore.h"
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#ifdef __SUNPRO_CC
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#include <stdio.h>
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#endif
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namespace mozilla {
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namespace widget {
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// the read end of the pipe, which will be used by GfxInfo
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extern int glxtest_pipe;
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// the PID of the glxtest process, to pass to waitpid()
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extern pid_t glxtest_pid;
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}
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}
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// the write end of the pipe, which we're going to write to
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static int write_end_of_the_pipe = -1;
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// C++ standard collides with C standard in that it doesn't allow casting void* to function pointer types.
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// So the work-around is to convert first to size_t.
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// http://www.trilithium.com/johan/2004/12/problem-with-dlsym/
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template<typename func_ptr_type>
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static func_ptr_type cast(void *ptr)
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{
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return reinterpret_cast<func_ptr_type>(
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reinterpret_cast<size_t>(ptr)
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);
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}
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static void fatal_error(const char *str)
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{
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write(write_end_of_the_pipe, str, strlen(str));
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write(write_end_of_the_pipe, "\n", 1);
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exit(EXIT_FAILURE);
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}
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static int
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x_error_handler(Display *, XErrorEvent *ev)
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{
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enum { bufsize = 1024 };
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char buf[bufsize];
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int length = snprintf(buf, bufsize,
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"X error occurred in GLX probe, error_code=%d, request_code=%d, minor_code=%d\n",
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ev->error_code,
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ev->request_code,
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ev->minor_code);
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write(write_end_of_the_pipe, buf, length);
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exit(EXIT_FAILURE);
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return 0;
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}
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static void glxtest()
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{
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///// Open libGL and load needed symbols /////
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#ifdef __OpenBSD__
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void *libgl = dlopen("libGL.so", RTLD_LAZY);
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#else
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void *libgl = dlopen("libGL.so.1", RTLD_LAZY);
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#endif
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if (!libgl)
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fatal_error("Unable to load libGL.so.1");
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typedef void* (* PFNGLXGETPROCADDRESS) (const char *);
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PFNGLXGETPROCADDRESS glXGetProcAddress = cast<PFNGLXGETPROCADDRESS>(dlsym(libgl, "glXGetProcAddress"));
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if (!glXGetProcAddress)
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fatal_error("Unable to find glXGetProcAddress in libGL.so.1");
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typedef GLXFBConfig* (* PFNGLXQUERYEXTENSION) (Display *, int *, int *);
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PFNGLXQUERYEXTENSION glXQueryExtension = cast<PFNGLXQUERYEXTENSION>(glXGetProcAddress("glXQueryExtension"));
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typedef GLXFBConfig* (* PFNGLXQUERYVERSION) (Display *, int *, int *);
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PFNGLXQUERYVERSION glXQueryVersion = cast<PFNGLXQUERYVERSION>(dlsym(libgl, "glXQueryVersion"));
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typedef GLXFBConfig* (* PFNGLXCHOOSEFBCONFIG) (Display *, int, const int *, int *);
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PFNGLXCHOOSEFBCONFIG glXChooseFBConfig = cast<PFNGLXCHOOSEFBCONFIG>(glXGetProcAddress("glXChooseFBConfig"));
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typedef XVisualInfo* (* PFNGLXGETVISUALFROMFBCONFIG) (Display *, GLXFBConfig);
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PFNGLXGETVISUALFROMFBCONFIG glXGetVisualFromFBConfig = cast<PFNGLXGETVISUALFROMFBCONFIG>(glXGetProcAddress("glXGetVisualFromFBConfig"));
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typedef GLXPixmap (* PFNGLXCREATEPIXMAP) (Display *, GLXFBConfig, Pixmap, const int *);
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PFNGLXCREATEPIXMAP glXCreatePixmap = cast<PFNGLXCREATEPIXMAP>(glXGetProcAddress("glXCreatePixmap"));
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typedef GLXContext (* PFNGLXCREATENEWCONTEXT) (Display *, GLXFBConfig, int, GLXContext, Bool);
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PFNGLXCREATENEWCONTEXT glXCreateNewContext = cast<PFNGLXCREATENEWCONTEXT>(glXGetProcAddress("glXCreateNewContext"));
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typedef Bool (* PFNGLXMAKECURRENT) (Display*, GLXDrawable, GLXContext);
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PFNGLXMAKECURRENT glXMakeCurrent = cast<PFNGLXMAKECURRENT>(glXGetProcAddress("glXMakeCurrent"));
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typedef void (* PFNGLXDESTROYPIXMAP) (Display *, GLXPixmap);
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PFNGLXDESTROYPIXMAP glXDestroyPixmap = cast<PFNGLXDESTROYPIXMAP>(glXGetProcAddress("glXDestroyPixmap"));
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typedef void (* PFNGLXDESTROYCONTEXT) (Display*, GLXContext);
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PFNGLXDESTROYCONTEXT glXDestroyContext = cast<PFNGLXDESTROYCONTEXT>(glXGetProcAddress("glXDestroyContext"));
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typedef GLubyte* (* PFNGLGETSTRING) (GLenum);
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PFNGLGETSTRING glGetString = cast<PFNGLGETSTRING>(glXGetProcAddress("glGetString"));
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if (!glXQueryExtension ||
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!glXQueryVersion ||
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!glXChooseFBConfig ||
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!glXGetVisualFromFBConfig ||
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!glXCreatePixmap ||
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!glXCreateNewContext ||
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!glXMakeCurrent ||
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!glXDestroyPixmap ||
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!glXDestroyContext ||
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!glGetString)
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{
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fatal_error("glXGetProcAddress couldn't find required functions");
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}
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///// Open a connection to the X server /////
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Display *dpy = XOpenDisplay(NULL);
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if (!dpy)
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fatal_error("Unable to open a connection to the X server");
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///// Check that the GLX extension is present /////
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if (!glXQueryExtension(dpy, NULL, NULL))
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fatal_error("GLX extension missing");
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///// Check that the GLX version is >= 1.3, needed for glXCreatePixmap, bug 659932 /////
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int majorVersion, minorVersion;
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if (!glXQueryVersion(dpy, &majorVersion, &minorVersion))
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fatal_error("Unable to query GLX version");
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if (majorVersion < 1 || (majorVersion == 1 && minorVersion < 3))
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fatal_error("GLX version older than the required 1.3");
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XSetErrorHandler(x_error_handler);
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///// Get a FBConfig and a visual /////
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int attribs[] = {
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GLX_DRAWABLE_TYPE, GLX_PIXMAP_BIT,
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GLX_X_RENDERABLE, True,
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0
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};
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int numReturned;
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GLXFBConfig *fbConfigs = glXChooseFBConfig(dpy, DefaultScreen(dpy), attribs, &numReturned );
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if (!fbConfigs)
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fatal_error("No FBConfigs found");
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XVisualInfo *vInfo = glXGetVisualFromFBConfig(dpy, fbConfigs[0]);
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if (!vInfo)
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fatal_error("No visual found for first FBConfig");
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///// Get a Pixmap and a GLXPixmap /////
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Pixmap pixmap = XCreatePixmap(dpy, RootWindow(dpy, vInfo->screen), 4, 4, 32);
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GLXPixmap glxpixmap = glXCreatePixmap(dpy, fbConfigs[0], pixmap, NULL);
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///// Get a GL context and make it current //////
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GLXContext context = glXCreateNewContext(dpy, fbConfigs[0], GLX_RGBA_TYPE, NULL, True);
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glXMakeCurrent(dpy, glxpixmap, context);
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///// Look for this symbol to determine texture_from_pixmap support /////
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void* glXBindTexImageEXT = glXGetProcAddress("glXBindTexImageEXT");
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///// Get GL vendor/renderer/versions strings /////
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enum { bufsize = 1024 };
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char buf[bufsize];
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const GLubyte *vendorString = glGetString(GL_VENDOR);
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const GLubyte *rendererString = glGetString(GL_RENDERER);
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const GLubyte *versionString = glGetString(GL_VERSION);
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if (!vendorString || !rendererString || !versionString)
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fatal_error("glGetString returned null");
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int length = snprintf(buf, bufsize,
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"VENDOR\n%s\nRENDERER\n%s\nVERSION\n%s\nTFP\n%s\n",
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vendorString,
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rendererString,
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versionString,
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glXBindTexImageEXT ? "TRUE" : "FALSE");
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if (length >= bufsize)
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fatal_error("GL strings length too large for buffer size");
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///// Check that no X error happened /////
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// In case of X errors, our X error handler will exit() now.
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// We really want to make sure that the system is able to create a GL context without generating X errors,
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// as these would crash the application.
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XSync(dpy, False);
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///// Finally write data to the pipe /////
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write(write_end_of_the_pipe, buf, length);
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///// Clean up. Indeed, the parent process might fail to kill us (e.g. if it doesn't need to check GL info)
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///// so we might be staying alive for longer than expected, so it's important to consume as little memory as
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///// possible. Also we want to check that we're able to do that too without generating X errors.
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glXMakeCurrent(dpy, None, NULL); // must release the GL context before destroying it
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glXDestroyContext(dpy, context);
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glXDestroyPixmap(dpy, glxpixmap);
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XFreePixmap(dpy, pixmap);
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XCloseDisplay(dpy);
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dlclose(libgl);
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}
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/** \returns true in the child glxtest process, false in the parent process */
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bool fire_glxtest_process()
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{
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int pfd[2];
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if (pipe(pfd) == -1) {
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perror("pipe");
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return false;
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}
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pid_t pid = fork();
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if (pid < 0) {
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perror("fork");
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close(pfd[0]);
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close(pfd[1]);
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return false;
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}
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if (pid == 0) {
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close(pfd[0]);
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write_end_of_the_pipe = pfd[1];
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glxtest();
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close(pfd[1]);
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return true;
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}
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close(pfd[1]);
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mozilla::widget::glxtest_pipe = pfd[0];
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mozilla::widget::glxtest_pid = pid;
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return false;
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}
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