| File: | tools/cafe-session-check-accelerated-gl-helper.c |
| Warning: | line 507, column 17 This statement is never executed |
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| 1 | /* |
| 2 | * Copyright (C) 2010 Novell, Inc. |
| 3 | * Copyright (C) 2006-2009 Red Hat, Inc. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | * |
| 19 | * Author: |
| 20 | * Vincent Untz <vuntz@gnome.org> |
| 21 | * |
| 22 | * Most of the code comes from desktop-effects [1], released under GPLv2+. |
| 23 | * desktop-effects was written by: |
| 24 | * Soren Sandmann <sandmann@redhat.com> |
| 25 | * |
| 26 | * [1] http://git.fedorahosted.org/git/?p=desktop-effects.git;a=blob_plain;f=desktop-effects.c;hb=HEAD |
| 27 | */ |
| 28 | |
| 29 | /* |
| 30 | * Here's the rationale behind this helper, quoting Owen, in his mail to the |
| 31 | * release team: |
| 32 | * (http://mail.gnome.org/archives/release-team/2010-June/msg00079.html) |
| 33 | * |
| 34 | * """ |
| 35 | * There are some limits to what we can do here automatically without |
| 36 | * knowing anything about the driver situation on the system. The basic |
| 37 | * problem is that there are all sorts of suck: |
| 38 | * |
| 39 | * * No GL at all. This typically only happens if a system is |
| 40 | * misconfigured. |
| 41 | * |
| 42 | * * Only software GL. This one is easy to detect. We have code in |
| 43 | * the Fedora desktop-effects tool, etc. |
| 44 | * |
| 45 | * * GL that isn't featureful enough. (Tiny texture size limits, no |
| 46 | * texture-from-pixmap, etc.) Possible to detect with more work, but |
| 47 | * largely a fringe case. |
| 48 | * |
| 49 | * * Buggy GL. This isn't possible to detect. Except for the case where |
| 50 | * all GL programs crash. For that reason, we probably don't want |
| 51 | * gnome-session to directly try and do any GL detection; better to |
| 52 | * use a helper binary. |
| 53 | * |
| 54 | * * Horribly slow hardware GL. We could theoretically develop some sort |
| 55 | * of benchmark, but it's a tricky area. And how slow is too slow? |
| 56 | * """ |
| 57 | * |
| 58 | * Some other tools are doing similar checks: |
| 59 | * - desktop-effects (Fedora Config Tool) [1] |
| 60 | * - drak3d (Mandriva Config Tool) [2] |
| 61 | * - compiz-manager (Compiz wrapper) [3] |
| 62 | * |
| 63 | * [1] http://git.fedorahosted.org/git/?p=desktop-effects.git;a=blob_plain;f=desktop-effects.c;hb=HEAD |
| 64 | * [2] http://svn.mandriva.com/cgi-bin/viewvc.cgi/soft/drak3d/trunk/lib/Xconfig/glx.pm?view=markup |
| 65 | * [3] http://git.compiz.org/fusion/misc/compiz-manager/tree/compiz-manager |
| 66 | */ |
| 67 | |
| 68 | /* for strcasestr */ |
| 69 | #define _GNU_SOURCE |
| 70 | |
| 71 | #include <ctype.h> |
| 72 | #include <locale.h> |
| 73 | #include <stdio.h> |
| 74 | #include <stdlib.h> |
| 75 | #include <string.h> |
| 76 | #include <glib.h> |
| 77 | |
| 78 | #include <regex.h> |
| 79 | |
| 80 | #ifdef __FreeBSD__ |
| 81 | #include <kenv.h> |
| 82 | #endif |
| 83 | |
| 84 | #include <X11/Xlib.h> |
| 85 | #include <X11/Xatom.h> |
| 86 | #include <X11/extensions/Xcomposite.h> |
| 87 | #include <GL/gl.h> |
| 88 | #include <GL/glx.h> |
| 89 | |
| 90 | #include "cafe-session-check-accelerated-common.h" |
| 91 | |
| 92 | #define SIZE_UNSET0 0 |
| 93 | #define SIZE_ERROR-1 -1 |
| 94 | static int max_texture_size = SIZE_UNSET0; |
| 95 | static int max_renderbuffer_size = SIZE_UNSET0; |
| 96 | static gboolean has_llvmpipe = FALSE(0); |
| 97 | |
| 98 | static inline void |
| 99 | _print_error (const char *str) |
| 100 | { |
| 101 | fprintf (stderrstderr, "cafe-session-is-accelerated: %s\n", str); |
| 102 | } |
| 103 | |
| 104 | #define CMDLINE_UNSET-1 -1 |
| 105 | #define CMDLINE_NON_FALLBACK_FORCED0 0 |
| 106 | #define CMDLINE_FALLBACK_FORCED1 1 |
| 107 | |
| 108 | #if defined(__linux__1) |
| 109 | static int |
| 110 | _parse_kcmdline (void) |
| 111 | { |
| 112 | int ret = CMDLINE_UNSET-1; |
| 113 | GRegex *regex; |
| 114 | GMatchInfo *match; |
| 115 | char *contents; |
| 116 | char *word; |
| 117 | const char *arg; |
| 118 | |
| 119 | if (!g_file_get_contents ("/proc/cmdline", &contents, NULL((void*)0), NULL((void*)0))) |
| 120 | return ret; |
| 121 | |
| 122 | regex = g_regex_new ("cafe.fallback=(\\S+)", 0, G_REGEX_MATCH_NOTEMPTY, NULL((void*)0)); |
| 123 | if (!g_regex_match (regex, contents, G_REGEX_MATCH_NOTEMPTY, &match)) |
| 124 | goto out; |
| 125 | |
| 126 | word = g_match_info_fetch (match, 0); |
| 127 | g_debug ("Found command-line match '%s'", word); |
| 128 | arg = word + strlen ("cafe.fallback="); |
| 129 | if (*arg != '0' && *arg != '1') |
| 130 | fprintf (stderrstderr, "cafe-session-check-accelerated: Invalid value '%s' for cafe.fallback passed in kernel command line.\n", arg); |
| 131 | else |
| 132 | ret = atoi (arg); |
| 133 | g_free (word); |
| 134 | |
| 135 | out: |
| 136 | g_match_info_free (match); |
| 137 | g_regex_unref (regex); |
| 138 | g_free (contents); |
| 139 | |
| 140 | g_debug ("Command-line parsed to %d", ret); |
| 141 | |
| 142 | return ret; |
| 143 | } |
| 144 | #elif defined(__FreeBSD__) |
| 145 | static int |
| 146 | _parse_kcmdline (void) |
| 147 | { |
| 148 | int ret = CMDLINE_UNSET-1; |
| 149 | char value[KENV_MVALLEN]; |
| 150 | |
| 151 | /* a compile time check to avoid unexpected stack overflow */ |
| 152 | _Static_assert(KENV_MVALLEN < 1024 * 1024, "KENV_MVALLEN is too large"); |
| 153 | |
| 154 | if (kenv (KENV_GET, "cafe.fallback", value, KENV_MVALLEN) == -1) |
| 155 | return ret; |
| 156 | |
| 157 | if (*value != '0' && *value != '1') |
| 158 | fprintf (stderrstderr, "cafe-session-is-accelerated: Invalid value '%s' for cafe.fallback passed in kernel environment.\n", value); |
| 159 | else |
| 160 | ret = atoi (value); |
| 161 | |
| 162 | g_debug ("Kernel environment parsed to %d", ret); |
| 163 | |
| 164 | return ret; |
| 165 | } |
| 166 | #else |
| 167 | static int |
| 168 | _parse_kcmdline (void) |
| 169 | { |
| 170 | return CMDLINE_UNSET-1; |
| 171 | } |
| 172 | #endif |
| 173 | |
| 174 | static gboolean |
| 175 | _has_composite (Display *display) |
| 176 | { |
| 177 | int dummy1, dummy2; |
| 178 | |
| 179 | return XCompositeQueryExtension (display, &dummy1, &dummy2); |
| 180 | } |
| 181 | |
| 182 | static gboolean |
| 183 | _is_comment (const char *line) |
| 184 | { |
| 185 | while (*line && isspace(*line)((*__ctype_b_loc ())[(int) ((*line))] & (unsigned short int ) _ISspace)) |
| 186 | line++; |
| 187 | |
| 188 | if (*line == '#' || *line == '\0') |
| 189 | return TRUE(!(0)); |
| 190 | return FALSE(0); |
| 191 | } |
| 192 | |
| 193 | static gboolean |
| 194 | _is_gl_renderer_blacklisted (const char *renderer) |
| 195 | { |
| 196 | FILE *blacklist; |
| 197 | char *line = NULL((void*)0); |
| 198 | size_t line_len = 0; |
| 199 | gboolean ret = TRUE(!(0)); |
| 200 | |
| 201 | blacklist = fopen(PKGDATADIR"/usr/share/cafe-session-manager" "/hardware-compatibility", "r"); |
| 202 | if (blacklist == NULL((void*)0)) |
| 203 | goto out; |
| 204 | |
| 205 | while (getline (&line, &line_len, blacklist) != -1) { |
| 206 | int whitelist = 0; |
| 207 | const char *re_str; |
| 208 | regex_t re; |
| 209 | int status; |
| 210 | |
| 211 | if (line == NULL((void*)0)) |
| 212 | break; |
| 213 | |
| 214 | /* Drop trailing \n */ |
| 215 | line[strlen(line) - 1] = '\0'; |
| 216 | |
| 217 | if (_is_comment (line)) { |
| 218 | free (line); |
| 219 | line = NULL((void*)0); |
| 220 | continue; |
| 221 | } |
| 222 | |
| 223 | if (line[0] == '+') |
| 224 | whitelist = 1; |
| 225 | else if (line[0] == '-') |
| 226 | whitelist = 0; |
| 227 | else { |
| 228 | _print_error ("Invalid syntax in this line for hardware compatibility:"); |
| 229 | _print_error (line); |
| 230 | free (line); |
| 231 | line = NULL((void*)0); |
| 232 | continue; |
| 233 | } |
| 234 | |
| 235 | re_str = line + 1; |
| 236 | |
| 237 | if (regcomp (&re, re_str, REG_EXTENDED1|REG_ICASE(1 << 1)|REG_NOSUB(1 << 3)) != 0) { |
| 238 | _print_error ("Cannot use this regular expression for hardware compatibility:"); |
| 239 | _print_error (re_str); |
| 240 | } else { |
| 241 | status = regexec (&re, renderer, 0, NULL((void*)0), 0); |
| 242 | regfree(&re); |
| 243 | |
| 244 | if (status == 0) { |
| 245 | if (whitelist) |
| 246 | ret = FALSE(0); |
| 247 | goto out; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | free (line); |
| 252 | line = NULL((void*)0); |
| 253 | } |
| 254 | |
| 255 | ret = FALSE(0); |
| 256 | |
| 257 | out: |
| 258 | if (line != NULL((void*)0)) |
| 259 | free (line); |
| 260 | |
| 261 | if (blacklist != NULL((void*)0)) |
| 262 | fclose (blacklist); |
| 263 | |
| 264 | return ret; |
| 265 | } |
| 266 | |
| 267 | static char * |
| 268 | _get_hardware_gl (Display *display) |
| 269 | { |
| 270 | int screen; |
| 271 | Window root; |
| 272 | XVisualInfo *visual = NULL((void*)0); |
| 273 | GLXContext context = NULL((void*)0); |
| 274 | XSetWindowAttributes cwa = { 0 }; |
| 275 | Window window = None0L; |
| 276 | char *renderer = NULL((void*)0); |
| 277 | |
| 278 | int attrlist[] = { |
| 279 | GLX_RGBA4, |
| 280 | GLX_RED_SIZE8, 1, |
| 281 | GLX_GREEN_SIZE9, 1, |
| 282 | GLX_BLUE_SIZE10, 1, |
| 283 | GLX_DOUBLEBUFFER5, |
| 284 | None0L |
| 285 | }; |
| 286 | |
| 287 | screen = DefaultScreen (display)(((_XPrivDisplay)(display))->default_screen); |
| 288 | root = RootWindow (display, screen)((&((_XPrivDisplay)(display))->screens[screen])->root ); |
| 289 | |
| 290 | visual = glXChooseVisual (display, screen, attrlist); |
| 291 | if (!visual) |
| 292 | goto out; |
| 293 | |
| 294 | context = glXCreateContext (display, visual, NULL((void*)0), True1); |
| 295 | if (!context) |
| 296 | goto out; |
| 297 | |
| 298 | cwa.colormap = XCreateColormap (display, root, |
| 299 | visual->visual, AllocNone0); |
| 300 | cwa.background_pixel = 0; |
| 301 | cwa.border_pixel = 0; |
| 302 | window = XCreateWindow (display, root, |
| 303 | 0, 0, 1, 1, 0, |
| 304 | visual->depth, InputOutput1, visual->visual, |
| 305 | CWColormap(1L<<13) | CWBackPixel(1L<<1) | CWBorderPixel(1L<<3), |
| 306 | &cwa); |
| 307 | |
| 308 | if (!glXMakeCurrent (display, window, context)) |
| 309 | goto out; |
| 310 | |
| 311 | renderer = g_strdup ((const char *) glGetString (GL_RENDERER))g_strdup_inline ((const char *) glGetString (0x1F01)); |
| 312 | if (_is_gl_renderer_blacklisted (renderer)) { |
| 313 | g_clear_pointer (&renderer, g_free)do { _Static_assert (sizeof *(&renderer) == sizeof (gpointer ), "Expression evaluates to false"); __typeof__ ((&renderer )) _pp = (&renderer); __typeof__ (*(&renderer)) _ptr = *_pp; *_pp = ((void*)0); if (_ptr) (g_free) (_ptr); } while ( 0); |
| 314 | goto out; |
| 315 | } |
| 316 | if (renderer && strcasestr (renderer, "llvmpipe")) |
| 317 | has_llvmpipe = TRUE(!(0)); |
| 318 | |
| 319 | /* we need to get the max texture and renderbuffer sizes while we have |
| 320 | * a context, but we'll check their values later */ |
| 321 | |
| 322 | glGetIntegerv (GL_MAX_TEXTURE_SIZE0x0D33, &max_texture_size); |
| 323 | if (glGetError() != GL_NO_ERROR0) |
| 324 | max_texture_size = SIZE_ERROR-1; |
| 325 | |
| 326 | glGetIntegerv (GL_MAX_RENDERBUFFER_SIZE_EXT0x84E8, &max_renderbuffer_size); |
| 327 | if (glGetError() != GL_NO_ERROR0) |
| 328 | max_renderbuffer_size = SIZE_ERROR-1; |
| 329 | |
| 330 | out: |
| 331 | glXMakeCurrent (display, None0L, None0L); |
| 332 | if (context) |
| 333 | glXDestroyContext (display, context); |
| 334 | if (window) |
| 335 | XDestroyWindow (display, window); |
| 336 | if (cwa.colormap) |
| 337 | XFreeColormap (display, cwa.colormap); |
| 338 | |
| 339 | return renderer; |
| 340 | } |
| 341 | |
| 342 | static gboolean |
| 343 | _has_extension (const char *extension_list, |
| 344 | const char *extension) |
| 345 | { |
| 346 | char **extensions; |
| 347 | guint i; |
| 348 | gboolean ret; |
| 349 | |
| 350 | g_return_val_if_fail (extension != NULL, TRUE)do { if ((extension != ((void*)0))) { } else { g_return_if_fail_warning (((gchar*) 0), ((const char*) (__func__)), "extension != NULL" ); return ((!(0))); } } while (0); |
| 351 | |
| 352 | /* Extension_list is one big string, containing extensions |
| 353 | * separated by spaces. */ |
| 354 | if (extension_list == NULL((void*)0)) |
| 355 | return FALSE(0); |
| 356 | |
| 357 | ret = FALSE(0); |
| 358 | |
| 359 | extensions = g_strsplit (extension_list, " ", -1); |
| 360 | if (extensions == NULL((void*)0)) |
| 361 | return FALSE(0); |
| 362 | |
| 363 | for (i = 0; extensions[i] != NULL((void*)0); i++) { |
| 364 | if (g_str_equal (extensions[i], extension)(strcmp ((const char *) (extensions[i]), (const char *) (extension )) == 0)) { |
| 365 | ret = TRUE(!(0)); |
| 366 | break; |
| 367 | } |
| 368 | } |
| 369 | |
| 370 | g_strfreev (extensions); |
| 371 | |
| 372 | return ret; |
| 373 | } |
| 374 | |
| 375 | static gboolean |
| 376 | _has_texture_from_pixmap (Display *display) |
| 377 | { |
| 378 | int screen; |
| 379 | const char *server_extensions; |
| 380 | const char *client_extensions; |
| 381 | gboolean ret = FALSE(0); |
| 382 | |
| 383 | screen = DefaultScreen (display)(((_XPrivDisplay)(display))->default_screen); |
| 384 | |
| 385 | server_extensions = glXQueryServerString (display, screen, |
| 386 | GLX_EXTENSIONS3); |
| 387 | if (!_has_extension (server_extensions, |
| 388 | "GLX_EXT_texture_from_pixmap")) |
| 389 | goto out; |
| 390 | |
| 391 | client_extensions = glXGetClientString (display, GLX_EXTENSIONS3); |
| 392 | if (!_has_extension (client_extensions, |
| 393 | "GLX_EXT_texture_from_pixmap")) |
| 394 | goto out; |
| 395 | |
| 396 | ret = TRUE(!(0)); |
| 397 | |
| 398 | out: |
| 399 | return ret; |
| 400 | } |
| 401 | |
| 402 | static void |
| 403 | _set_max_screen_size_property (Display *display, int screen, int size) |
| 404 | { |
| 405 | Atom max_screen_size_atom; |
| 406 | |
| 407 | max_screen_size_atom = XInternAtom (display, "_GNOME_MAX_SCREEN_SIZE", |
| 408 | False0); |
| 409 | |
| 410 | /* Will be read by gnome-settings-daemon and |
| 411 | * gnome-control-center to avoid display configurations where 3D |
| 412 | * is not available (and would break gnome-shell) */ |
| 413 | XChangeProperty (display, RootWindow(display, screen)((&((_XPrivDisplay)(display))->screens[screen])->root ), |
| 414 | max_screen_size_atom, |
| 415 | XA_CARDINAL((Atom) 6), 32, PropModeReplace0, |
| 416 | (unsigned char *)&size, 1); |
| 417 | |
| 418 | XSync(display, False0); |
| 419 | } |
| 420 | |
| 421 | static gboolean |
| 422 | _is_max_texture_size_big_enough (Display *display) |
| 423 | { |
| 424 | int screen, size; |
| 425 | |
| 426 | screen = DefaultScreen (display)(((_XPrivDisplay)(display))->default_screen); |
| 427 | size = MIN(max_renderbuffer_size, max_texture_size)(((max_renderbuffer_size) < (max_texture_size)) ? (max_renderbuffer_size ) : (max_texture_size)); |
| 428 | if (size < DisplayWidth (display, screen)((&((_XPrivDisplay)(display))->screens[screen])->width ) || |
| 429 | size < DisplayHeight (display, screen)((&((_XPrivDisplay)(display))->screens[screen])->height )) |
| 430 | return FALSE(0); |
| 431 | |
| 432 | _set_max_screen_size_property (display, screen, size); |
| 433 | |
| 434 | return TRUE(!(0)); |
| 435 | } |
| 436 | |
| 437 | static gboolean print_renderer = FALSE(0); |
| 438 | |
| 439 | static const GOptionEntry entries[] = { |
| 440 | { "print-renderer", 'p', 0, G_OPTION_ARG_NONE, &print_renderer, "Print GL renderer name", NULL((void*)0) }, |
| 441 | { NULL((void*)0) }, |
| 442 | }; |
| 443 | |
| 444 | int |
| 445 | main (int argc, char **argv) |
| 446 | { |
| 447 | int kcmdline_parsed; |
| 448 | Display *display = NULL((void*)0); |
| 449 | int ret = HELPER_NO_ACCEL1; |
| 450 | GOptionContext *context; |
| 451 | GError *error = NULL((void*)0); |
| 452 | char *renderer = NULL((void*)0); |
| 453 | |
| 454 | setlocale (LC_ALL6, ""); |
| 455 | |
| 456 | context = g_option_context_new (NULL((void*)0)); |
| 457 | g_option_context_add_main_entries (context, entries, NULL((void*)0)); |
| 458 | |
| 459 | if (!g_option_context_parse (context, &argc, &argv, &error)) { |
| 460 | g_error ("Can't parse command line: %s\n", error->message); |
| 461 | g_error_free (error); |
| 462 | goto out; |
| 463 | } |
| 464 | |
| 465 | kcmdline_parsed = _parse_kcmdline (); |
| 466 | if (kcmdline_parsed > CMDLINE_UNSET-1) { |
| 467 | if (kcmdline_parsed == CMDLINE_NON_FALLBACK_FORCED0) { |
| 468 | _print_error ("Non-fallback mode forced by kernel command line."); |
| 469 | ret = HELPER_ACCEL0; |
| 470 | goto out; |
| 471 | } else if (kcmdline_parsed == CMDLINE_FALLBACK_FORCED1) { |
| 472 | _print_error ("Fallback mode forced by kernel command line."); |
| 473 | goto out; |
| 474 | } |
| 475 | } |
| 476 | |
| 477 | display = XOpenDisplay (NULL((void*)0)); |
| 478 | if (!display) { |
| 479 | _print_error ("No X display."); |
| 480 | goto out; |
| 481 | } |
| 482 | |
| 483 | if (!_has_composite (display)) { |
| 484 | _print_error ("No composite extension."); |
| 485 | goto out; |
| 486 | } |
| 487 | |
| 488 | renderer = _get_hardware_gl (display); |
| 489 | if (!renderer) { |
| 490 | _print_error ("No hardware 3D support."); |
| 491 | goto out; |
| 492 | } |
| 493 | |
| 494 | if (!_has_texture_from_pixmap (display)) { |
| 495 | _print_error ("No GLX_EXT_texture_from_pixmap support."); |
| 496 | goto out; |
| 497 | } |
| 498 | |
| 499 | if (!_is_max_texture_size_big_enough (display)) { |
| 500 | _print_error ("GL_MAX_{TEXTURE,RENDERBUFFER}_SIZE is too small."); |
| 501 | goto out; |
| 502 | } |
| 503 | |
| 504 | ret = has_llvmpipe ? HELPER_SOFTWARE_RENDERING2 : HELPER_ACCEL0; |
| 505 | |
| 506 | if (print_renderer) |
| 507 | g_print ("%s", renderer); |
This statement is never executed | |
| 508 | |
| 509 | out: |
| 510 | if (display) |
| 511 | XCloseDisplay (display); |
| 512 | g_free (renderer); |
| 513 | |
| 514 | return ret; |
| 515 | } |