compositor/compositor-drm.c

   1 /*
   2  * Copyright © 2008-2010 Kristian Høgsberg
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software Foundation,
  16  * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <fcntl.h>
  25 #include <unistd.h>
  26
  27 #include <xf86drm.h>
  28 #include <xf86drmMode.h>
  29
  30 #include "compositor.h"
  31
  32 struct drm_compositor {
  33         struct wlsc_compositor base;
  34
  35         struct udev *udev;
  36         struct wl_event_source *drm_source;
  37
  38         struct udev_monitor *udev_monitor;
  39         struct wl_event_source *udev_drm_source;
  40
  41         struct {
  42                 int fd;
  43         } drm;
  44         uint32_t crtc_allocator;
  45         uint32_t connector_allocator;
  46         struct tty *tty;
  47
  48         PFNEGLCREATEDRMIMAGEMESA create_drm_image;
  49         PFNEGLEXPORTDRMIMAGEMESA export_drm_image;
  50 };
  51
  52 struct drm_output {
  53         struct wlsc_output   base;
  54
  55         drmModeModeInfo mode;
  56         uint32_t crtc_id;
  57         uint32_t connector_id;
  58         GLuint rbo[2];
  59         uint32_t fb_id[2];
  60         EGLImageKHR image[2];
  61         uint32_t current;
  62
  63         struct wlsc_surface *scanout_surface;
  64
  65         uint32_t fs_surf_fb_id;
  66         uint32_t pending_fs_surf_fb_id;
  67 };
  68
  69 static int
  70 drm_output_prepare_render(struct wlsc_output *output_base)
  71 {
  72         struct drm_output *output = (struct drm_output *) output_base;
  73
  74         glFramebufferRenderbuffer(GL_FRAMEBUFFER,
  75                                   GL_COLOR_ATTACHMENT0,
  76                                   GL_RENDERBUFFER,
  77                                   output->rbo[output->current]);
  78
  79         if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
  80                 return -1;
  81
  82         return 0;
  83 }
  84
  85 static int
  86 drm_output_present(struct wlsc_output *output_base)
  87 {
  88         struct drm_output *output = (struct drm_output *) output_base;
  89         struct drm_compositor *c =
  90                 (struct drm_compositor *) output->base.compositor;
  91         uint32_t fb_id = 0;
  92
  93         if (drm_output_prepare_render(&output->base))
  94                 return -1;
  95         glFlush();
  96
  97         output->current ^= 1;
  98
  99         if (output->scanout_surface != NULL) {
 100                 output->scanout_surface = NULL;
 101                 fb_id = output->fs_surf_fb_id;
 102         } else {
 103                 fb_id = output->fb_id[output->current ^ 1];
 104         }
 105
 106         drmModePageFlip(c->drm.fd, output->crtc_id,
 107                         fb_id,
 108                         DRM_MODE_PAGE_FLIP_EVENT, output);
 109
 110         return 0;
 111 }
 112
 113 static void
 114 page_flip_handler(int fd, unsigned int frame,
 115                   unsigned int sec, unsigned int usec, void *data)
 116 {
 117         struct drm_output *output = (struct drm_output *) data;
 118         struct drm_compositor *c =
 119                 (struct drm_compositor *) output->base.compositor;
 120         uint32_t msecs;
 121
 122         if (output->pending_fs_surf_fb_id) {
 123                 drmModeRmFB(c->drm.fd, output->pending_fs_surf_fb_id);
 124                 output->pending_fs_surf_fb_id = 0;
 125         }
 126
 127         if (output->fs_surf_fb_id) {
 128                 output->pending_fs_surf_fb_id = output->fs_surf_fb_id;
 129                 output->fs_surf_fb_id = 0;
 130         }
 131
 132         msecs = sec * 1000 + usec / 1000;
 133         wlsc_output_finish_frame(&output->base, msecs);
 134 }
 135
 136 static int
 137 drm_output_prepare_scanout_surface(struct wlsc_output *output_base,
 138                                    struct wlsc_surface *es)
 139 {
 140         struct drm_output *output = (struct drm_output *) output_base;
 141         struct drm_compositor *c =
 142                 (struct drm_compositor *) output->base.compositor;
 143         EGLint handle, stride;
 144         int ret;
 145         uint32_t fb_id = 0;
 146
 147         if (es->x != output->base.x ||
 148             es->y != output->base.y ||
 149             es->width != output->base.width ||
 150             es->height != output->base.height ||
 151             es->image == EGL_NO_IMAGE_KHR)
 152                 return -1;
 153
 154         c->export_drm_image(c->base.display,
 155                             es->image, NULL, &handle, &stride);
 156
 157         if (handle == 0)
 158                 return -1;
 159
 160         ret = drmModeAddFB(c->drm.fd,
 161                            output->base.width, output->base.height,
 162                            32, 32, stride, handle, &fb_id);
 163
 164         if (ret)
 165                 return -1;
 166
 167         output->fs_surf_fb_id = fb_id;
 168         output->scanout_surface = es;
 169
 170         return 0;
 171 }
 172
 173 static int
 174 drm_output_set_cursor(struct wlsc_output *output_base,
 175                       struct wl_input_device *input)
 176 {
 177         struct drm_output *output = (struct drm_output *) output_base;
 178         struct drm_compositor *c =
 179                 (struct drm_compositor *) output->base.compositor;
 180         struct wlsc_input_device *eid = (struct wlsc_input_device *) input;
 181         EGLint handle, stride;
 182         int ret = -1;
 183         pixman_region32_t cursor_region;
 184
 185         pixman_region32_init_rect(&cursor_region,
 186                                   eid->sprite->x, eid->sprite->y,
 187                                   eid->sprite->width, eid->sprite->height);
 188
 189         pixman_region32_intersect_rect(&cursor_region, &cursor_region,
 190                                        output->base.x, output->base.y,
 191                                        output->base.width, output->base.height);
 192
 193         if (!pixman_region32_not_empty(&cursor_region)) {
 194                 ret = 0;
 195                 goto out;
 196         }
 197
 198         if (eid->sprite->image == EGL_NO_IMAGE_KHR)
 199                 goto out;
 200
 201         if (eid->sprite->width > 64 || eid->sprite->height > 64)
 202                 goto out;
 203
 204         c->export_drm_image(c->base.display, eid->sprite->image,
 205                             NULL, &handle, &stride);
 206
 207         if (stride != 64 * 4) {
 208                 fprintf(stderr, "info: cursor stride is != 64\n");
 209                 goto out;
 210         }
 211
 212         ret = drmModeSetCursor(c->drm.fd, output->crtc_id, handle, 64, 64);
 213         if (ret) {
 214                 fprintf(stderr, "failed to set cursor: %s\n", strerror(-ret));
 215                 goto out;
 216         }
 217
 218         ret = drmModeMoveCursor(c->drm.fd, output->crtc_id,
 219                                 eid->sprite->x - output->base.x,
 220                                 eid->sprite->y - output->base.y);
 221         if (ret) {
 222                 fprintf(stderr, "failed to move cursor: %s\n", strerror(-ret));
 223                 goto out;
 224         }
 225
 226         printf("info: set hardware cursor\n");
 227
 228 out:
 229         pixman_region32_fini(&cursor_region);
 230         if (ret)
 231                 drmModeSetCursor(c->drm.fd, output->crtc_id, 0, 0, 0);
 232         return ret;
 233 }
 234
 235 static int
 236 on_drm_input(int fd, uint32_t mask, void *data)
 237 {
 238         drmEventContext evctx;
 239
 240         memset(&evctx, 0, sizeof evctx);
 241         evctx.version = DRM_EVENT_CONTEXT_VERSION;
 242         evctx.page_flip_handler = page_flip_handler;
 243         drmHandleEvent(fd, &evctx);
 244
 245         return 1;
 246 }
 247
 248 static int
 249 init_egl(struct drm_compositor *ec, struct udev_device *device)
 250 {
 251         EGLint major, minor;
 252         const char *extensions, *filename;
 253         int fd;
 254         static const EGLint context_attribs[] = {
 255                 EGL_CONTEXT_CLIENT_VERSION, 2,
 256                 EGL_NONE
 257         };
 258
 259         filename = udev_device_get_devnode(device);
 260         fd = open(filename, O_RDWR, O_CLOEXEC);
 261         if (fd < 0) {
 262                 /* Probably permissions error */
 263                 fprintf(stderr, "couldn't open %s, skipping\n",
 264                         udev_device_get_devnode(device));
 265                 return -1;
 266         }
 267
 268         ec->drm.fd = fd;
 269         ec->base.display = eglGetDisplay(FD_TO_EGL_NATIVE_DPY(ec->drm.fd));
 270         if (ec->base.display == NULL) {
 271                 fprintf(stderr, "failed to create display\n");
 272                 return -1;
 273         }
 274
 275         if (!eglInitialize(ec->base.display, &major, &minor)) {
 276                 fprintf(stderr, "failed to initialize display\n");
 277                 return -1;
 278         }
 279
 280         extensions = eglQueryString(ec->base.display, EGL_EXTENSIONS);
 281         if (!strstr(extensions, "EGL_KHR_surfaceless_opengl")) {
 282                 fprintf(stderr, "EGL_KHR_surfaceless_opengl not available\n");
 283                 return -1;
 284         }
 285
 286         if (!eglBindAPI(EGL_OPENGL_ES_API)) {
 287                 fprintf(stderr, "failed to bind api EGL_OPENGL_ES_API\n");
 288                 return -1;
 289         }
 290
 291         ec->base.context = eglCreateContext(ec->base.display, NULL,
 292                                             EGL_NO_CONTEXT, context_attribs);
 293         if (ec->base.context == NULL) {
 294                 fprintf(stderr, "failed to create context\n");
 295                 return -1;
 296         }
 297
 298         if (!eglMakeCurrent(ec->base.display, EGL_NO_SURFACE,
 299                             EGL_NO_SURFACE, ec->base.context)) {
 300                 fprintf(stderr, "failed to make context current\n");
 301                 return -1;
 302         }
 303
 304         return 0;
 305 }
 306
 307 static drmModeModeInfo builtin_1024x768 = {
 308         63500,                  /* clock */
 309         1024, 1072, 1176, 1328, 0,
 310         768, 771, 775, 798, 0,
 311         59920,
 312         DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
 313         0,
 314         "1024x768"
 315 };
 316
 317 static int
 318 create_output_for_connector(struct drm_compositor *ec,
 319                             drmModeRes *resources,
 320                             drmModeConnector *connector,
 321                             int x, int y)
 322 {
 323         struct drm_output *output;
 324         drmModeEncoder *encoder;
 325         drmModeModeInfo *mode;
 326         int i, ret;
 327         EGLint handle, stride, attribs[] = {
 328                 EGL_WIDTH,              0,
 329                 EGL_HEIGHT,             0,
 330                 EGL_DRM_BUFFER_FORMAT_MESA,     EGL_DRM_BUFFER_FORMAT_ARGB32_MESA,
 331                 EGL_DRM_BUFFER_USE_MESA,        EGL_DRM_BUFFER_USE_SCANOUT_MESA,
 332                 EGL_NONE
 333         };
 334
 335         output = malloc(sizeof *output);
 336         if (output == NULL)
 337                 return -1;
 338
 339         if (connector->count_modes > 0)
 340                 mode = &connector->modes[0];
 341         else
 342                 mode = &builtin_1024x768;
 343
 344         encoder = drmModeGetEncoder(ec->drm.fd, connector->encoders[0]);
 345         if (encoder == NULL) {
 346                 fprintf(stderr, "No encoder for connector.\n");
 347                 return -1;
 348         }
 349
 350         for (i = 0; i < resources->count_crtcs; i++) {
 351                 if (encoder->possible_crtcs & (1 << i) &&
 352                     !(ec->crtc_allocator & (1 << resources->crtcs[i])))
 353                         break;
 354         }
 355         if (i == resources->count_crtcs) {
 356                 fprintf(stderr, "No usable crtc for encoder.\n");
 357                 return -1;
 358         }
 359
 360         memset(output, 0, sizeof *output);
 361         wlsc_output_init(&output->base, &ec->base, x, y,
 362                          mode->hdisplay, mode->vdisplay, 0);
 363
 364         output->crtc_id = resources->crtcs[i];
 365         ec->crtc_allocator |= (1 << output->crtc_id);
 366
 367         output->connector_id = connector->connector_id;
 368         ec->connector_allocator |= (1 << output->connector_id);
 369         output->mode = *mode;
 370
 371         drmModeFreeEncoder(encoder);
 372
 373         glGenRenderbuffers(2, output->rbo);
 374         for (i = 0; i < 2; i++) {
 375                 glBindRenderbuffer(GL_RENDERBUFFER, output->rbo[i]);
 376
 377                 attribs[1] = output->base.width;
 378                 attribs[3] = output->base.height;
 379                 output->image[i] =
 380                         ec->create_drm_image(ec->base.display, attribs);
 381                 ec->base.image_target_renderbuffer_storage(GL_RENDERBUFFER,
 382                                                            output->image[i]);
 383                 ec->export_drm_image(ec->base.display, output->image[i],
 384                                      NULL, &handle, &stride);
 385
 386                 ret = drmModeAddFB(ec->drm.fd,
 387                                    output->base.width, output->base.height,
 388                                    32, 32, stride, handle, &output->fb_id[i]);
 389                 if (ret) {
 390                         fprintf(stderr, "failed to add fb %d: %m\n", i);
 391                         return -1;
 392                 }
 393         }
 394
 395         output->current = 0;
 396         glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 397                                   GL_COLOR_ATTACHMENT0,
 398                                   GL_RENDERBUFFER,
 399                                   output->rbo[output->current]);
 400         ret = drmModeSetCrtc(ec->drm.fd, output->crtc_id,
 401                              output->fb_id[output->current ^ 1], 0, 0,
 402                              &output->connector_id, 1, &output->mode);
 403         if (ret) {
 404                 fprintf(stderr, "failed to set mode: %m\n");
 405                 return -1;
 406         }
 407
 408         output->scanout_surface = NULL;
 409         output->base.prepare_render = drm_output_prepare_render;
 410         output->base.present = drm_output_present;
 411         output->base.prepare_scanout_surface =
 412                 drm_output_prepare_scanout_surface;
 413         output->base.set_hardware_cursor = drm_output_set_cursor;
 414
 415         wl_list_insert(ec->base.output_list.prev, &output->base.link);
 416
 417         return 0;
 418 }
 419
 420 static int
 421 create_outputs(struct drm_compositor *ec, int option_connector)
 422 {
 423         drmModeConnector *connector;
 424         drmModeRes *resources;
 425         int i;
 426         int x = 0, y = 0;
 427
 428         resources = drmModeGetResources(ec->drm.fd);
 429         if (!resources) {
 430                 fprintf(stderr, "drmModeGetResources failed\n");
 431                 return -1;
 432         }
 433
 434         for (i = 0; i < resources->count_connectors; i++) {
 435                 connector = drmModeGetConnector(ec->drm.fd, resources->connectors[i]);
 436                 if (connector == NULL)
 437                         continue;
 438
 439                 if (connector->connection == DRM_MODE_CONNECTED &&
 440                     (option_connector == 0 ||
 441                      connector->connector_id == option_connector))
 442                         if (create_output_for_connector(ec, resources,
 443                                                         connector, x, y) < 0)
 444                                 return -1;
 445
 446                 x += container_of(ec->base.output_list.prev, struct wlsc_output,
 447                                   link)->width;
 448
 449                 drmModeFreeConnector(connector);
 450         }
 451
 452         if (wl_list_empty(&ec->base.output_list)) {
 453                 fprintf(stderr, "No currently active connector found.\n");
 454                 return -1;
 455         }
 456
 457         drmModeFreeResources(resources);
 458
 459         return 0;
 460 }
 461
 462 static int
 463 destroy_output(struct drm_output *output)
 464 {
 465         struct drm_compositor *ec =
 466                 (struct drm_compositor *) output->base.compositor;
 467         int i;
 468
 469         glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 470                                   GL_COLOR_ATTACHMENT0,
 471                                   GL_RENDERBUFFER,
 472                                   0);
 473
 474         glBindRenderbuffer(GL_RENDERBUFFER, 0);
 475         glDeleteRenderbuffers(2, output->rbo);
 476
 477         for (i = 0; i < 2; i++) {
 478                 ec->base.destroy_image(ec->base.display, output->image[i]);
 479                 drmModeRmFB(ec->drm.fd, output->fb_id[i]);
 480         }
 481
 482         ec->crtc_allocator &= ~(1 << output->crtc_id);
 483         ec->connector_allocator &= ~(1 << output->connector_id);
 484
 485         wlsc_output_destroy(&output->base);
 486         wl_list_remove(&output->base.link);
 487
 488         free(output);
 489
 490         return 0;
 491 }
 492
 493 static void
 494 update_outputs(struct drm_compositor *ec)
 495 {
 496         drmModeConnector *connector;
 497         drmModeRes *resources;
 498         struct drm_output *output, *next;
 499         int x = 0, y = 0;
 500         int x_offset = 0, y_offset = 0;
 501         uint32_t connected = 0, disconnects = 0;
 502         int i;
 503
 504         resources = drmModeGetResources(ec->drm.fd);
 505         if (!resources) {
 506                 fprintf(stderr, "drmModeGetResources failed\n");
 507                 return;
 508         }
 509
 510         /* collect new connects */
 511         for (i = 0; i < resources->count_connectors; i++) {
 512                 connector =
 513                         drmModeGetConnector(ec->drm.fd,
 514                                             resources->connectors[i]);
 515                 if (connector == NULL ||
 516                     connector->connection != DRM_MODE_CONNECTED)
 517                         continue;
 518
 519                 connected |= (1 << connector->connector_id);
 520
 521                 if (!(ec->connector_allocator & (1 << connector->connector_id))) {
 522                         struct wlsc_output *last_output =
 523                                 container_of(ec->base.output_list.prev,
 524                                              struct wlsc_output, link);
 525
 526                         /* XXX: not yet needed, we die with 0 outputs */
 527                         if (!wl_list_empty(&ec->base.output_list))
 528                                 x = last_output->x + last_output->width;
 529                         else
 530                                 x = 0;
 531                         y = 0;
 532                         create_output_for_connector(ec, resources,
 533                                                     connector, x, y);
 534                         printf("connector %d connected\n",
 535                                connector->connector_id);
 536
 537                 }
 538                 drmModeFreeConnector(connector);
 539         }
 540         drmModeFreeResources(resources);
 541
 542         disconnects = ec->connector_allocator & ~connected;
 543         if (disconnects) {
 544                 wl_list_for_each_safe(output, next, &ec->base.output_list,
 545                                       base.link) {
 546                         if (x_offset != 0 || y_offset != 0) {
 547                                 wlsc_output_move(&output->base,
 548                                                  output->base.x - x_offset,
 549                                                  output->base.y - y_offset);
 550                         }
 551
 552                         if (disconnects & (1 << output->connector_id)) {
 553                                 disconnects &= ~(1 << output->connector_id);
 554                                 printf("connector %d disconnected\n",
 555                                        output->connector_id);
 556                                 x_offset += output->base.width;
 557                                 destroy_output(output);
 558                         }
 559                 }
 560         }
 561
 562         /* FIXME: handle zero outputs, without terminating */
 563         if (ec->connector_allocator == 0)
 564                 wl_display_terminate(ec->base.wl_display);
 565 }
 566
 567 static int
 568 udev_event_is_hotplug(struct udev_device *device)
 569 {
 570         struct udev_list_entry *list, *hotplug_entry;
 571
 572         list = udev_device_get_properties_list_entry(device);
 573
 574         hotplug_entry = udev_list_entry_get_by_name(list, "HOTPLUG");
 575         if (hotplug_entry == NULL)
 576                 return 0;
 577
 578         return strcmp(udev_list_entry_get_value(hotplug_entry), "1") == 0;
 579 }
 580
 581 static int
 582 udev_drm_event(int fd, uint32_t mask, void *data)
 583 {
 584         struct drm_compositor *ec = data;
 585         struct udev_device *event;
 586
 587         event = udev_monitor_receive_device(ec->udev_monitor);
 588
 589         if (udev_event_is_hotplug(event))
 590                 update_outputs(ec);
 591
 592         udev_device_unref(event);
 593
 594         return 1;
 595 }
 596
 597 static EGLImageKHR
 598 drm_compositor_create_cursor_image(struct wlsc_compositor *ec,
 599                                    int32_t width, int32_t height)
 600 {
 601         static const EGLint image_attribs[] = {
 602                 EGL_WIDTH, 64,
 603                 EGL_HEIGHT, 64,
 604                 EGL_DRM_BUFFER_FORMAT_MESA, EGL_DRM_BUFFER_FORMAT_ARGB32_MESA,
 605                 EGL_DRM_BUFFER_USE_MESA, EGL_DRM_BUFFER_USE_CURSOR_MESA,
 606                 EGL_NONE
 607         };
 608         struct drm_compositor *c = (struct drm_compositor *) ec;
 609
 610         if (width > 64 || height > 64)
 611                 return EGL_NO_IMAGE_KHR;
 612
 613         return c->create_drm_image(ec->display, image_attribs);
 614 }
 615
 616 static void
 617 drm_destroy(struct wlsc_compositor *ec)
 618 {
 619         struct drm_compositor *d = (struct drm_compositor *) ec;
 620
 621         tty_destroy(d->tty);
 622
 623         free(d);
 624 }
 625
 626 struct wlsc_compositor *
 627 drm_compositor_create(struct wl_display *display, int connector)
 628 {
 629         struct drm_compositor *ec;
 630         struct udev_enumerate *e;
 631         struct udev_list_entry *entry;
 632         struct udev_device *device;
 633         const char *path;
 634         struct wl_event_loop *loop;
 635
 636         ec = malloc(sizeof *ec);
 637         if (ec == NULL)
 638                 return NULL;
 639
 640         memset(ec, 0, sizeof *ec);
 641         ec->udev = udev_new();
 642         if (ec->udev == NULL) {
 643                 fprintf(stderr, "failed to initialize udev context\n");
 644                 return NULL;
 645         }
 646
 647         e = udev_enumerate_new(ec->udev);
 648         udev_enumerate_add_match_subsystem(e, "drm");
 649         udev_enumerate_add_match_property(e, "WAYLAND_SEAT", "1");
 650         udev_enumerate_scan_devices(e);
 651         device = NULL;
 652         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 653                 path = udev_list_entry_get_name(entry);
 654                 device = udev_device_new_from_syspath(ec->udev, path);
 655                 break;
 656         }
 657         udev_enumerate_unref(e);
 658
 659         if (device == NULL) {
 660                 fprintf(stderr, "no drm device found\n");
 661                 return NULL;
 662         }
 663
 664         ec->base.wl_display = display;
 665         if (init_egl(ec, device) < 0) {
 666                 fprintf(stderr, "failed to initialize egl\n");
 667                 return NULL;
 668         }
 669
 670         ec->base.destroy = drm_destroy;
 671         ec->base.create_cursor_image = drm_compositor_create_cursor_image;
 672
 673         ec->base.focus = 1;
 674
 675         glGenFramebuffers(1, &ec->base.fbo);
 676         glBindFramebuffer(GL_FRAMEBUFFER, ec->base.fbo);
 677
 678         ec->create_drm_image =
 679                 (void *) eglGetProcAddress("eglCreateDRMImageMESA");
 680         ec->export_drm_image =
 681                 (void *) eglGetProcAddress("eglExportDRMImageMESA");
 682
 683         /* Can't init base class until we have a current egl context */
 684         if (wlsc_compositor_init(&ec->base, display) < 0)
 685                 return NULL;
 686
 687         if (create_outputs(ec, connector) < 0) {
 688                 fprintf(stderr, "failed to create output for %s\n", path);
 689                 return NULL;
 690         }
 691
 692         evdev_input_add_devices(&ec->base, ec->udev);
 693
 694         loop = wl_display_get_event_loop(ec->base.wl_display);
 695         ec->drm_source =
 696                 wl_event_loop_add_fd(loop, ec->drm.fd,
 697                                      WL_EVENT_READABLE, on_drm_input, ec);
 698         ec->tty = tty_create(&ec->base);
 699
 700         ec->udev_monitor = udev_monitor_new_from_netlink(ec->udev, "udev");
 701         if (ec->udev_monitor == NULL) {
 702                 fprintf(stderr, "failed to intialize udev monitor\n");
 703                 return NULL;
 704         }
 705         udev_monitor_filter_add_match_subsystem_devtype(ec->udev_monitor,
 706                                                         "drm", NULL);
 707         ec->udev_drm_source =
 708                 wl_event_loop_add_fd(loop, udev_monitor_get_fd(ec->udev_monitor),
 709                                      WL_EVENT_READABLE, udev_drm_event, ec);
 710
 711         if (udev_monitor_enable_receiving(ec->udev_monitor) < 0) {
 712                 fprintf(stderr, "failed to enable udev-monitor receiving\n");
 713                 return NULL;
 714         }
 715
 716         return &ec->base;
 717 }
 718
 719 struct wlsc_compositor *
 720 backend_init(struct wl_display *display, char *options)
 721 {
 722         int connector = 0, i;
 723         char *p, *value;
 724
 725         static char * const tokens[] = { "connector", NULL };
 726
 727         p = options;
 728         while (i = getsubopt(&p, tokens, &value), i != -1) {
 729                 switch (i) {
 730                 case 0:
 731                         connector = strtol(value, NULL, 0);
 732                         break;
 733                 }
 734         }
 735
 736         return drm_compositor_create(display, connector);
 737 }