summaryrefslogtreecommitdiff
path: root/tools/mate-session-check-accelerated-gl-helper.c
blob: e11206e7b646d309a8e170f968b89a1b682ecbd8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
/*
 * Copyright (C) 2010      Novell, Inc.
 * Copyright (C) 2006-2009 Red Hat, Inc.
 * Copyright (C) 2012-2021 MATE Developers
 *
 * 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 "mate-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, "mate-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 ("mate.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 ("mate.fallback=");
        if (*arg != '0' && *arg != '1')
                fprintf (stderr, "mate-session-check-accelerated: Invalid value '%s' for mate.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, "mate.fallback", value, KENV_MVALLEN) == -1)
                return ret;

        if (*value != '0' && *value != '1')
                fprintf (stderr, "mate-session-is-accelerated: Invalid value '%s' for mate.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, 0, 0, G_OPTION_ARG_NONE, NULL, 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_option_context_free (context);
        g_free (renderer);

        return ret;
}