mirror of
https://github.com/mozilla/gecko-dev.git
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287 lines
9.6 KiB
C++
287 lines
9.6 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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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 <dlfcn.h>
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#include "nscore.h"
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#include <fcntl.h>
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#include "stdint.h"
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#ifdef __SUNPRO_CC
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#include <stdio.h>
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#endif
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#include "X11/Xlib.h"
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#include "X11/Xutil.h"
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// stuff from glx.h
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typedef struct __GLXcontextRec *GLXContext;
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typedef XID GLXPixmap;
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typedef XID GLXDrawable;
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/* GLX 1.3 and later */
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typedef struct __GLXFBConfigRec *GLXFBConfig;
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typedef XID GLXFBConfigID;
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typedef XID GLXContextID;
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typedef XID GLXWindow;
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typedef XID GLXPbuffer;
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#define GLX_RGBA 4
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#define GLX_RED_SIZE 8
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#define GLX_GREEN_SIZE 9
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#define GLX_BLUE_SIZE 10
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// stuff from gl.h
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typedef uint8_t GLubyte;
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typedef uint32_t GLenum;
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#define GL_VENDOR 0x1F00
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#define GL_RENDERER 0x1F01
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#define GL_VERSION 0x1F02
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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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// glxtest is declared inside extern "C" so that the name is not mangled.
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// The name is used in build/valgrind/x86_64-redhat-linux-gnu.sup to suppress
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// memory leak errors because we run it inside a short lived fork and we don't
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// care about leaking memory
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extern "C" {
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void glxtest()
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{
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// we want to redirect to /dev/null stdout, stderr, and while we're at it,
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// any PR logging file descriptors. To that effect, we redirect all positive
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// file descriptors up to what open() returns here. In particular, 1 is stdout and 2 is stderr.
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int fd = open("/dev/null", O_WRONLY);
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for (int i = 1; i < fd; i++)
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dup2(fd, i);
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close(fd);
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if (getenv("MOZ_AVOID_OPENGL_ALTOGETHER"))
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fatal_error("The MOZ_AVOID_OPENGL_ALTOGETHER environment variable is defined");
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///// Open libGL and load needed symbols /////
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#ifdef __OpenBSD__
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#define LIBGL_FILENAME "libGL.so"
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#else
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#define LIBGL_FILENAME "libGL.so.1"
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#endif
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void *libgl = dlopen(LIBGL_FILENAME, RTLD_LAZY);
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if (!libgl)
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fatal_error("Unable to load " LIBGL_FILENAME);
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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_FILENAME);
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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 XVisualInfo* (* PFNGLXCHOOSEVISUAL) (Display *, int, int *);
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PFNGLXCHOOSEVISUAL glXChooseVisual = cast<PFNGLXCHOOSEVISUAL>(glXGetProcAddress("glXChooseVisual"));
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typedef GLXContext (* PFNGLXCREATECONTEXT) (Display *, XVisualInfo *, GLXContext, Bool);
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PFNGLXCREATECONTEXT glXCreateContext = cast<PFNGLXCREATECONTEXT>(glXGetProcAddress("glXCreateContext"));
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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 (* 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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!glXChooseVisual ||
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!glXCreateContext ||
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!glXMakeCurrent ||
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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(nullptr);
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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, nullptr, nullptr))
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fatal_error("GLX extension missing");
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XSetErrorHandler(x_error_handler);
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///// Get a visual /////
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int attribs[] = {
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GLX_RGBA,
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GLX_RED_SIZE, 1,
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GLX_GREEN_SIZE, 1,
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GLX_BLUE_SIZE, 1,
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None };
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XVisualInfo *vInfo = glXChooseVisual(dpy, DefaultScreen(dpy), attribs);
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if (!vInfo)
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fatal_error("No visuals found");
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// using a X11 Window instead of a GLXPixmap does not crash
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// fglrx in indirect rendering. bug 680644
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Window window;
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XSetWindowAttributes swa;
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swa.colormap = XCreateColormap(dpy, RootWindow(dpy, vInfo->screen),
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vInfo->visual, AllocNone);
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swa.border_pixel = 0;
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window = XCreateWindow(dpy, RootWindow(dpy, vInfo->screen),
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0, 0, 16, 16,
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0, vInfo->depth, InputOutput, vInfo->visual,
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CWBorderPixel | CWColormap, &swa);
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///// Get a GL context and make it current //////
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GLXContext context = glXCreateContext(dpy, vInfo, nullptr, True);
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glXMakeCurrent(dpy, window, 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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///// 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, nullptr); // must release the GL context before destroying it
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glXDestroyContext(dpy, context);
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XDestroyWindow(dpy, window);
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XFreeColormap(dpy, swa.colormap);
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#ifdef NS_FREE_PERMANENT_DATA // conditionally defined in nscore.h, don't forget to #include it above
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XCloseDisplay(dpy);
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#else
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// This XSync call wanted to be instead:
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// XCloseDisplay(dpy);
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// but this can cause 1-minute stalls on certain setups using Nouveau, see bug 973192
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XSync(dpy, False);
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#endif
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dlclose(libgl);
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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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}
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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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// The child exits early to avoid running the full shutdown sequence and avoid conflicting with threads
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// we have already spawned (like the profiler).
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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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_exit(0);
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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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