mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-01 14:45:29 +00:00
244 lines
8.4 KiB
C++
244 lines
8.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
|
|
* vim: sw=2 ts=8 et :
|
|
*/
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////////
|
|
//
|
|
// Explanation: See bug 639842. Safely getting GL driver info on X11 is hard, because the only way to do
|
|
// that is to create a GL context and call glGetString(), but with bad drivers,
|
|
// just creating a GL context may crash.
|
|
//
|
|
// This file implements the idea to do that in a separate process.
|
|
//
|
|
// The only non-static function here is fire_glxtest_process(). It creates a pipe, publishes its 'read' end as the
|
|
// mozilla::widget::glxtest_pipe global variable, forks, and runs that GLX probe in the child process,
|
|
// which runs the glxtest() static function. This creates a X connection, a GLX context, calls glGetString, and writes that
|
|
// to the 'write' end of the pipe.
|
|
|
|
#include <cstdio>
|
|
#include <cstdlib>
|
|
#include <unistd.h>
|
|
#include <GL/gl.h>
|
|
#include <GL/glx.h>
|
|
#include <dlfcn.h>
|
|
#include "nscore.h"
|
|
|
|
#include <fcntl.h>
|
|
|
|
#ifdef __SUNPRO_CC
|
|
#include <stdio.h>
|
|
#endif
|
|
|
|
namespace mozilla {
|
|
namespace widget {
|
|
// the read end of the pipe, which will be used by GfxInfo
|
|
extern int glxtest_pipe;
|
|
// the PID of the glxtest process, to pass to waitpid()
|
|
extern pid_t glxtest_pid;
|
|
}
|
|
}
|
|
|
|
// the write end of the pipe, which we're going to write to
|
|
static int write_end_of_the_pipe = -1;
|
|
|
|
// C++ standard collides with C standard in that it doesn't allow casting void* to function pointer types.
|
|
// So the work-around is to convert first to size_t.
|
|
// http://www.trilithium.com/johan/2004/12/problem-with-dlsym/
|
|
template<typename func_ptr_type>
|
|
static func_ptr_type cast(void *ptr)
|
|
{
|
|
return reinterpret_cast<func_ptr_type>(
|
|
reinterpret_cast<size_t>(ptr)
|
|
);
|
|
}
|
|
|
|
static void fatal_error(const char *str)
|
|
{
|
|
write(write_end_of_the_pipe, str, strlen(str));
|
|
write(write_end_of_the_pipe, "\n", 1);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
static int
|
|
x_error_handler(Display *, XErrorEvent *ev)
|
|
{
|
|
enum { bufsize = 1024 };
|
|
char buf[bufsize];
|
|
int length = snprintf(buf, bufsize,
|
|
"X error occurred in GLX probe, error_code=%d, request_code=%d, minor_code=%d\n",
|
|
ev->error_code,
|
|
ev->request_code,
|
|
ev->minor_code);
|
|
write(write_end_of_the_pipe, buf, length);
|
|
exit(EXIT_FAILURE);
|
|
return 0;
|
|
}
|
|
|
|
static void glxtest()
|
|
{
|
|
// we want to redirect to /dev/null stdout, stderr, and while we're at it,
|
|
// any PR logging file descriptors. To that effect, we redirect all positive
|
|
// file descriptors up to what open() returns here. In particular, 1 is stdout and 2 is stderr.
|
|
int fd = open("/dev/null", O_WRONLY);
|
|
for (int i = 1; i < fd; i++)
|
|
dup2(fd, i);
|
|
close(fd);
|
|
|
|
if (getenv("MOZ_AVOID_OPENGL_ALTOGETHER"))
|
|
fatal_error("The MOZ_AVOID_OPENGL_ALTOGETHER environment variable is defined");
|
|
|
|
///// Open libGL and load needed symbols /////
|
|
#ifdef __OpenBSD__
|
|
#define LIBGL_FILENAME "libGL.so"
|
|
#else
|
|
#define LIBGL_FILENAME "libGL.so.1"
|
|
#endif
|
|
void *libgl = dlopen(LIBGL_FILENAME, RTLD_LAZY);
|
|
if (!libgl)
|
|
fatal_error("Unable to load " LIBGL_FILENAME);
|
|
|
|
typedef void* (* PFNGLXGETPROCADDRESS) (const char *);
|
|
PFNGLXGETPROCADDRESS glXGetProcAddress = cast<PFNGLXGETPROCADDRESS>(dlsym(libgl, "glXGetProcAddress"));
|
|
|
|
if (!glXGetProcAddress)
|
|
fatal_error("Unable to find glXGetProcAddress in " LIBGL_FILENAME);
|
|
|
|
typedef GLXFBConfig* (* PFNGLXQUERYEXTENSION) (Display *, int *, int *);
|
|
PFNGLXQUERYEXTENSION glXQueryExtension = cast<PFNGLXQUERYEXTENSION>(glXGetProcAddress("glXQueryExtension"));
|
|
|
|
typedef GLXFBConfig* (* PFNGLXQUERYVERSION) (Display *, int *, int *);
|
|
PFNGLXQUERYVERSION glXQueryVersion = cast<PFNGLXQUERYVERSION>(dlsym(libgl, "glXQueryVersion"));
|
|
|
|
typedef XVisualInfo* (* PFNGLXCHOOSEVISUAL) (Display *, int, int *);
|
|
PFNGLXCHOOSEVISUAL glXChooseVisual = cast<PFNGLXCHOOSEVISUAL>(glXGetProcAddress("glXChooseVisual"));
|
|
|
|
typedef GLXContext (* PFNGLXCREATECONTEXT) (Display *, XVisualInfo *, GLXContext, Bool);
|
|
PFNGLXCREATECONTEXT glXCreateContext = cast<PFNGLXCREATECONTEXT>(glXGetProcAddress("glXCreateContext"));
|
|
|
|
typedef Bool (* PFNGLXMAKECURRENT) (Display*, GLXDrawable, GLXContext);
|
|
PFNGLXMAKECURRENT glXMakeCurrent = cast<PFNGLXMAKECURRENT>(glXGetProcAddress("glXMakeCurrent"));
|
|
|
|
typedef void (* PFNGLXDESTROYCONTEXT) (Display*, GLXContext);
|
|
PFNGLXDESTROYCONTEXT glXDestroyContext = cast<PFNGLXDESTROYCONTEXT>(glXGetProcAddress("glXDestroyContext"));
|
|
|
|
typedef GLubyte* (* PFNGLGETSTRING) (GLenum);
|
|
PFNGLGETSTRING glGetString = cast<PFNGLGETSTRING>(glXGetProcAddress("glGetString"));
|
|
|
|
if (!glXQueryExtension ||
|
|
!glXQueryVersion ||
|
|
!glXChooseVisual ||
|
|
!glXCreateContext ||
|
|
!glXMakeCurrent ||
|
|
!glXDestroyContext ||
|
|
!glGetString)
|
|
{
|
|
fatal_error("glXGetProcAddress couldn't find required functions");
|
|
}
|
|
///// Open a connection to the X server /////
|
|
Display *dpy = XOpenDisplay(NULL);
|
|
if (!dpy)
|
|
fatal_error("Unable to open a connection to the X server");
|
|
|
|
///// Check that the GLX extension is present /////
|
|
if (!glXQueryExtension(dpy, NULL, NULL))
|
|
fatal_error("GLX extension missing");
|
|
|
|
XSetErrorHandler(x_error_handler);
|
|
|
|
///// Get a visual /////
|
|
int attribs[] = {
|
|
GLX_RGBA,
|
|
GLX_RED_SIZE, 1,
|
|
GLX_GREEN_SIZE, 1,
|
|
GLX_BLUE_SIZE, 1,
|
|
None };
|
|
XVisualInfo *vInfo = glXChooseVisual(dpy, DefaultScreen(dpy), attribs);
|
|
if (!vInfo)
|
|
fatal_error("No visuals found");
|
|
|
|
// using a X11 Window instead of a GLXPixmap does not crash
|
|
// fglrx in indirect rendering. bug 680644
|
|
Window window;
|
|
XSetWindowAttributes swa;
|
|
swa.colormap = XCreateColormap(dpy, RootWindow(dpy, vInfo->screen),
|
|
vInfo->visual, AllocNone);
|
|
|
|
swa.border_pixel = 0;
|
|
window = XCreateWindow(dpy, RootWindow(dpy, vInfo->screen),
|
|
0, 0, 16, 16,
|
|
0, vInfo->depth, InputOutput, vInfo->visual,
|
|
CWBorderPixel | CWColormap, &swa);
|
|
|
|
///// Get a GL context and make it current //////
|
|
GLXContext context = glXCreateContext(dpy, vInfo, NULL, True);
|
|
glXMakeCurrent(dpy, window, context);
|
|
|
|
///// Look for this symbol to determine texture_from_pixmap support /////
|
|
void* glXBindTexImageEXT = glXGetProcAddress("glXBindTexImageEXT");
|
|
|
|
///// Get GL vendor/renderer/versions strings /////
|
|
enum { bufsize = 1024 };
|
|
char buf[bufsize];
|
|
const GLubyte *vendorString = glGetString(GL_VENDOR);
|
|
const GLubyte *rendererString = glGetString(GL_RENDERER);
|
|
const GLubyte *versionString = glGetString(GL_VERSION);
|
|
|
|
if (!vendorString || !rendererString || !versionString)
|
|
fatal_error("glGetString returned null");
|
|
|
|
int length = snprintf(buf, bufsize,
|
|
"VENDOR\n%s\nRENDERER\n%s\nVERSION\n%s\nTFP\n%s\n",
|
|
vendorString,
|
|
rendererString,
|
|
versionString,
|
|
glXBindTexImageEXT ? "TRUE" : "FALSE");
|
|
if (length >= bufsize)
|
|
fatal_error("GL strings length too large for buffer size");
|
|
|
|
///// Clean up. Indeed, the parent process might fail to kill us (e.g. if it doesn't need to check GL info)
|
|
///// so we might be staying alive for longer than expected, so it's important to consume as little memory as
|
|
///// possible. Also we want to check that we're able to do that too without generating X errors.
|
|
glXMakeCurrent(dpy, None, NULL); // must release the GL context before destroying it
|
|
glXDestroyContext(dpy, context);
|
|
XDestroyWindow(dpy, window);
|
|
XFreeColormap(dpy, swa.colormap);
|
|
XCloseDisplay(dpy);
|
|
dlclose(libgl);
|
|
|
|
///// Finally write data to the pipe
|
|
write(write_end_of_the_pipe, buf, length);
|
|
}
|
|
|
|
/** \returns true in the child glxtest process, false in the parent process */
|
|
bool fire_glxtest_process()
|
|
{
|
|
int pfd[2];
|
|
if (pipe(pfd) == -1) {
|
|
perror("pipe");
|
|
return false;
|
|
}
|
|
pid_t pid = fork();
|
|
if (pid < 0) {
|
|
perror("fork");
|
|
close(pfd[0]);
|
|
close(pfd[1]);
|
|
return false;
|
|
}
|
|
if (pid == 0) {
|
|
close(pfd[0]);
|
|
write_end_of_the_pipe = pfd[1];
|
|
glxtest();
|
|
close(pfd[1]);
|
|
return true;
|
|
}
|
|
|
|
close(pfd[1]);
|
|
mozilla::widget::glxtest_pipe = pfd[0];
|
|
mozilla::widget::glxtest_pid = pid;
|
|
return false;
|
|
}
|