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-rw-r--r--tools/gnome-session-check-accelerated-gl-helper.c517
1 files changed, 517 insertions, 0 deletions
diff --git a/tools/gnome-session-check-accelerated-gl-helper.c b/tools/gnome-session-check-accelerated-gl-helper.c
new file mode 100644
index 0000000..4be9638
--- /dev/null
+++ b/tools/gnome-session-check-accelerated-gl-helper.c
@@ -0,0 +1,517 @@
+/* gcc -o gnome-session-accelerated `pkg-config --cflags --libs xcomposite gl` -Wall gnome-session-is-accelerated.c */
+
+/*
+ * Copyright (C) 2010 Novell, Inc.
+ * Copyright (C) 2006-2009 Red Hat, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Author:
+ * Vincent Untz <vuntz@gnome.org>
+ *
+ * Most of the code comes from desktop-effects [1], released under GPLv2+.
+ * desktop-effects was written by:
+ * Soren Sandmann <sandmann@redhat.com>
+ *
+ * [1] http://git.fedorahosted.org/git/?p=desktop-effects.git;a=blob_plain;f=desktop-effects.c;hb=HEAD
+ */
+
+/*
+ * Here's the rationale behind this helper, quoting Owen, in his mail to the
+ * release team:
+ * (http://mail.gnome.org/archives/release-team/2010-June/msg00079.html)
+ *
+ * """
+ * There are some limits to what we can do here automatically without
+ * knowing anything about the driver situation on the system. The basic
+ * problem is that there are all sorts of suck:
+ *
+ * * No GL at all. This typically only happens if a system is
+ * misconfigured.
+ *
+ * * Only software GL. This one is easy to detect. We have code in
+ * the Fedora desktop-effects tool, etc.
+ *
+ * * GL that isn't featureful enough. (Tiny texture size limits, no
+ * texture-from-pixmap, etc.) Possible to detect with more work, but
+ * largely a fringe case.
+ *
+ * * Buggy GL. This isn't possible to detect. Except for the case where
+ * all GL programs crash. For that reason, we probably don't want
+ * gnome-session to directly try and do any GL detection; better to
+ * use a helper binary.
+ *
+ * * Horribly slow hardware GL. We could theoretically develop some sort
+ * of benchmark, but it's a tricky area. And how slow is too slow?
+ * """
+ *
+ * Some other tools are doing similar checks:
+ * - desktop-effects (Fedora Config Tool) [1]
+ * - drak3d (Mandriva Config Tool) [2]
+ * - compiz-manager (Compiz wrapper) [3]
+ *
+ * [1] http://git.fedorahosted.org/git/?p=desktop-effects.git;a=blob_plain;f=desktop-effects.c;hb=HEAD
+ * [2] http://svn.mandriva.com/cgi-bin/viewvc.cgi/soft/drak3d/trunk/lib/Xconfig/glx.pm?view=markup
+ * [3] http://git.compiz.org/fusion/misc/compiz-manager/tree/compiz-manager
+ */
+
+/* for strcasestr */
+#define _GNU_SOURCE
+
+#include <ctype.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <glib.h>
+
+#include <regex.h>
+
+#ifdef __FreeBSD__
+#include <kenv.h>
+#endif
+
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+#include <X11/extensions/Xcomposite.h>
+#include <GL/gl.h>
+#include <GL/glx.h>
+
+#include "gnome-session-check-accelerated-common.h"
+
+#define SIZE_UNSET 0
+#define SIZE_ERROR -1
+static int max_texture_size = SIZE_UNSET;
+static int max_renderbuffer_size = SIZE_UNSET;
+static gboolean has_llvmpipe = FALSE;
+
+static inline void
+_print_error (const char *str)
+{
+ fprintf (stderr, "gnome-session-is-accelerated: %s\n", str);
+}
+
+#define CMDLINE_UNSET -1
+#define CMDLINE_NON_FALLBACK_FORCED 0
+#define CMDLINE_FALLBACK_FORCED 1
+
+#if defined(__linux__)
+static int
+_parse_kcmdline (void)
+{
+ int ret = CMDLINE_UNSET;
+ GRegex *regex;
+ GMatchInfo *match;
+ char *contents;
+ char *word;
+ const char *arg;
+
+ if (!g_file_get_contents ("/proc/cmdline", &contents, NULL, NULL))
+ return ret;
+
+ regex = g_regex_new ("gnome.fallback=(\\S+)", 0, G_REGEX_MATCH_NOTEMPTY, NULL);
+ if (!g_regex_match (regex, contents, G_REGEX_MATCH_NOTEMPTY, &match))
+ goto out;
+
+ word = g_match_info_fetch (match, 0);
+ g_debug ("Found command-line match '%s'", word);
+ arg = word + strlen ("gnome.fallback=");
+ if (*arg != '0' && *arg != '1')
+ fprintf (stderr, "gnome-session-is-accelerated: Invalid value '%s' for gnome.fallback passed in kernel command line.\n", arg);
+ else
+ ret = atoi (arg);
+ g_free (word);
+
+out:
+ g_match_info_free (match);
+ g_regex_unref (regex);
+ g_free (contents);
+
+ g_debug ("Command-line parsed to %d", ret);
+
+ return ret;
+}
+#elif defined(__FreeBSD__)
+static int
+_parse_kcmdline (void)
+{
+ int ret = CMDLINE_UNSET;
+ char value[KENV_MVALLEN];
+
+ /* a compile time check to avoid unexpected stack overflow */
+ _Static_assert(KENV_MVALLEN < 1024 * 1024, "KENV_MVALLEN is too large");
+
+ if (kenv (KENV_GET, "gnome.fallback", value, KENV_MVALLEN) == -1)
+ return ret;
+
+ if (*value != '0' && *value != '1')
+ fprintf (stderr, "gnome-session-is-accelerated: Invalid value '%s' for gnome.fallback passed in kernel environment.\n", value);
+ else
+ ret = atoi (value);
+
+ g_debug ("Kernel environment parsed to %d", ret);
+
+ return ret;
+}
+#else
+static int
+_parse_kcmdline (void)
+{
+ return CMDLINE_UNSET;
+}
+#endif
+
+static gboolean
+_has_composite (Display *display)
+{
+ int dummy1, dummy2;
+
+ return XCompositeQueryExtension (display, &dummy1, &dummy2);
+}
+
+static gboolean
+_is_comment (const char *line)
+{
+ while (*line && isspace(*line))
+ line++;
+
+ if (*line == '#' || *line == '\0')
+ return TRUE;
+ return FALSE;
+}
+
+static gboolean
+_is_gl_renderer_blacklisted (const char *renderer)
+{
+ FILE *blacklist;
+ char *line = NULL;
+ size_t line_len = 0;
+ gboolean ret = TRUE;
+
+ blacklist = fopen(PKGDATADIR "/hardware-compatibility", "r");
+ if (blacklist == NULL)
+ goto out;
+
+ while (getline (&line, &line_len, blacklist) != -1) {
+ int whitelist = 0;
+ const char *re_str;
+ regex_t re;
+ int status;
+
+ if (line == NULL)
+ break;
+
+ /* Drop trailing \n */
+ line[strlen(line) - 1] = '\0';
+
+ if (_is_comment (line)) {
+ free (line);
+ line = NULL;
+ continue;
+ }
+
+ if (line[0] == '+')
+ whitelist = 1;
+ else if (line[0] == '-')
+ whitelist = 0;
+ else {
+ _print_error ("Invalid syntax in this line for hardware compatibility:");
+ _print_error (line);
+ free (line);
+ line = NULL;
+ continue;
+ }
+
+ re_str = line + 1;
+
+ if (regcomp (&re, re_str, REG_EXTENDED|REG_ICASE|REG_NOSUB) != 0) {
+ _print_error ("Cannot use this regular expression for hardware compatibility:");
+ _print_error (re_str);
+ } else {
+ status = regexec (&re, renderer, 0, NULL, 0);
+ regfree(&re);
+
+ if (status == 0) {
+ if (whitelist)
+ ret = FALSE;
+ goto out;
+ }
+ }
+
+ free (line);
+ line = NULL;
+ }
+
+ ret = FALSE;
+
+out:
+ if (line != NULL)
+ free (line);
+
+ if (blacklist != NULL)
+ fclose (blacklist);
+
+ return ret;
+}
+
+static char *
+_get_hardware_gl (Display *display)
+{
+ int screen;
+ Window root;
+ XVisualInfo *visual = NULL;
+ GLXContext context = NULL;
+ XSetWindowAttributes cwa = { 0 };
+ Window window = None;
+ char *renderer = NULL;
+
+ int attrlist[] = {
+ GLX_RGBA,
+ GLX_RED_SIZE, 1,
+ GLX_GREEN_SIZE, 1,
+ GLX_BLUE_SIZE, 1,
+ GLX_DOUBLEBUFFER,
+ None
+ };
+
+ screen = DefaultScreen (display);
+ root = RootWindow (display, screen);
+
+ visual = glXChooseVisual (display, screen, attrlist);
+ if (!visual)
+ goto out;
+
+ context = glXCreateContext (display, visual, NULL, True);
+ if (!context)
+ goto out;
+
+ cwa.colormap = XCreateColormap (display, root,
+ visual->visual, AllocNone);
+ cwa.background_pixel = 0;
+ cwa.border_pixel = 0;
+ window = XCreateWindow (display, root,
+ 0, 0, 1, 1, 0,
+ visual->depth, InputOutput, visual->visual,
+ CWColormap | CWBackPixel | CWBorderPixel,
+ &cwa);
+
+ if (!glXMakeCurrent (display, window, context))
+ goto out;
+
+ renderer = g_strdup ((const char *) glGetString (GL_RENDERER));
+ if (_is_gl_renderer_blacklisted (renderer)) {
+ g_clear_pointer (&renderer, g_free);
+ goto out;
+ }
+ if (renderer && strcasestr (renderer, "llvmpipe"))
+ has_llvmpipe = TRUE;
+
+ /* we need to get the max texture and renderbuffer sizes while we have
+ * a context, but we'll check their values later */
+
+ glGetIntegerv (GL_MAX_TEXTURE_SIZE, &max_texture_size);
+ if (glGetError() != GL_NO_ERROR)
+ max_texture_size = SIZE_ERROR;
+
+ glGetIntegerv (GL_MAX_RENDERBUFFER_SIZE_EXT, &max_renderbuffer_size);
+ if (glGetError() != GL_NO_ERROR)
+ max_renderbuffer_size = SIZE_ERROR;
+
+out:
+ glXMakeCurrent (display, None, None);
+ if (context)
+ glXDestroyContext (display, context);
+ if (window)
+ XDestroyWindow (display, window);
+ if (cwa.colormap)
+ XFreeColormap (display, cwa.colormap);
+
+ return renderer;
+}
+
+static gboolean
+_has_extension (const char *extension_list,
+ const char *extension)
+{
+ char **extensions;
+ guint i;
+ gboolean ret;
+
+ g_return_val_if_fail (extension != NULL, TRUE);
+
+ /* Extension_list is one big string, containing extensions
+ * separated by spaces. */
+ if (extension_list == NULL)
+ return FALSE;
+
+ ret = FALSE;
+
+ extensions = g_strsplit (extension_list, " ", -1);
+ if (extensions == NULL)
+ return FALSE;
+
+ for (i = 0; extensions[i] != NULL; i++) {
+ if (g_str_equal (extensions[i], extension)) {
+ ret = TRUE;
+ break;
+ }
+ }
+
+ g_strfreev (extensions);
+
+ return ret;
+}
+
+static gboolean
+_has_texture_from_pixmap (Display *display)
+{
+ int screen;
+ const char *server_extensions;
+ const char *client_extensions;
+ gboolean ret = FALSE;
+
+ screen = DefaultScreen (display);
+
+ server_extensions = glXQueryServerString (display, screen,
+ GLX_EXTENSIONS);
+ if (!_has_extension (server_extensions,
+ "GLX_EXT_texture_from_pixmap"))
+ goto out;
+
+ client_extensions = glXGetClientString (display, GLX_EXTENSIONS);
+ if (!_has_extension (client_extensions,
+ "GLX_EXT_texture_from_pixmap"))
+ goto out;
+
+ ret = TRUE;
+
+out:
+ return ret;
+}
+
+static void
+_set_max_screen_size_property (Display *display, int screen, int size)
+{
+ Atom max_screen_size_atom;
+
+ max_screen_size_atom = XInternAtom (display, "_GNOME_MAX_SCREEN_SIZE",
+ False);
+
+ /* Will be read by gnome-settings-daemon and
+ * gnome-control-center to avoid display configurations where 3D
+ * is not available (and would break gnome-shell) */
+ XChangeProperty (display, RootWindow(display, screen),
+ max_screen_size_atom,
+ XA_CARDINAL, 32, PropModeReplace,
+ (unsigned char *)&size, 1);
+
+ XSync(display, False);
+}
+
+static gboolean
+_is_max_texture_size_big_enough (Display *display)
+{
+ int screen, size;
+
+ screen = DefaultScreen (display);
+ size = MIN(max_renderbuffer_size, max_texture_size);
+ if (size < DisplayWidth (display, screen) ||
+ size < DisplayHeight (display, screen))
+ return FALSE;
+
+ _set_max_screen_size_property (display, screen, size);
+
+ return TRUE;
+}
+
+static gboolean print_renderer = FALSE;
+
+static const GOptionEntry entries[] = {
+ { "print-renderer", 'p', 0, G_OPTION_ARG_NONE, &print_renderer, "Print GL renderer name", NULL },
+ { NULL },
+};
+
+int
+main (int argc, char **argv)
+{
+ int kcmdline_parsed;
+ Display *display = NULL;
+ int ret = HELPER_NO_ACCEL;
+ GOptionContext *context;
+ GError *error = NULL;
+ char *renderer = NULL;
+
+ setlocale (LC_ALL, "");
+
+ context = g_option_context_new (NULL);
+ g_option_context_add_main_entries (context, entries, NULL);
+
+ if (!g_option_context_parse (context, &argc, &argv, &error)) {
+ g_error ("Can't parse command line: %s\n", error->message);
+ g_error_free (error);
+ goto out;
+ }
+
+ kcmdline_parsed = _parse_kcmdline ();
+ if (kcmdline_parsed > CMDLINE_UNSET) {
+ if (kcmdline_parsed == CMDLINE_NON_FALLBACK_FORCED) {
+ _print_error ("Non-fallback mode forced by kernel command line.");
+ ret = HELPER_ACCEL;
+ goto out;
+ } else if (kcmdline_parsed == CMDLINE_FALLBACK_FORCED) {
+ _print_error ("Fallback mode forced by kernel command line.");
+ goto out;
+ }
+ }
+
+ display = XOpenDisplay (NULL);
+ if (!display) {
+ _print_error ("No X display.");
+ goto out;
+ }
+
+ if (!_has_composite (display)) {
+ _print_error ("No composite extension.");
+ goto out;
+ }
+
+ renderer = _get_hardware_gl (display);
+ if (!renderer) {
+ _print_error ("No hardware 3D support.");
+ goto out;
+ }
+
+ if (!_has_texture_from_pixmap (display)) {
+ _print_error ("No GLX_EXT_texture_from_pixmap support.");
+ goto out;
+ }
+
+ if (!_is_max_texture_size_big_enough (display)) {
+ _print_error ("GL_MAX_{TEXTURE,RENDERBUFFER}_SIZE is too small.");
+ goto out;
+ }
+
+ ret = has_llvmpipe ? HELPER_SOFTWARE_RENDERING : HELPER_ACCEL;
+
+ if (print_renderer)
+ g_print ("%s", renderer);
+
+out:
+ if (display)
+ XCloseDisplay (display);
+ g_free (renderer);
+
+ return ret;
+}
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