Adding upstream version 3.38.0.upstream/3.38.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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;
+}