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 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24
  25 #define GL_GLEXT_PROTOTYPES
  26 #define EGL_EGLEXT_PROTOTYPES
  27 #include <GLES2/gl2.h>
  28 #include <GLES2/gl2ext.h>
  29 #include <EGL/egl.h>
  30 #include <EGL/eglext.h>
  31
  32 #include "compositor.h"
  33
  34 struct drm_compositor {
  35         struct wlsc_compositor base;
  36
  37         struct udev *udev;
  38         struct wl_event_source *drm_source;
  39
  40         struct tty *tty;
  41 };
  42
  43 struct drm_output {
  44         struct wlsc_output   base;
  45
  46         drmModeModeInfo mode;
  47         uint32_t crtc_id;
  48         uint32_t connector_id;
  49         GLuint rbo[2];
  50         uint32_t fb_id[2];
  51         EGLImageKHR image[2];
  52         uint32_t current;
  53 };
  54
  55 static void
  56 drm_compositor_present(struct wlsc_compositor *ec)
  57 {
  58         struct drm_compositor *c = (struct drm_compositor *) ec;
  59         struct drm_output *output;
  60
  61         wl_list_for_each(output, &ec->output_list, base.link) {
  62                 output->current ^= 1;
  63
  64                 glFramebufferRenderbuffer(GL_FRAMEBUFFER,
  65                                           GL_COLOR_ATTACHMENT0,
  66                                           GL_RENDERBUFFER,
  67                                           output->rbo[output->current]);
  68
  69                 drmModePageFlip(c->base.drm.fd, output->crtc_id,
  70                                 output->fb_id[output->current ^ 1],
  71                                 DRM_MODE_PAGE_FLIP_EVENT, output);
  72         }
  73 }
  74
  75 static void
  76 page_flip_handler(int fd, unsigned int frame,
  77                   unsigned int sec, unsigned int usec, void *data)
  78 {
  79         struct wlsc_output *output = data;
  80         struct wlsc_compositor *compositor = output->compositor;
  81         uint32_t msecs;
  82
  83         msecs = sec * 1000 + usec / 1000;
  84         wlsc_compositor_finish_frame(compositor, msecs);
  85 }
  86
  87 static void
  88 on_drm_input(int fd, uint32_t mask, void *data)
  89 {
  90         drmEventContext evctx;
  91
  92         memset(&evctx, 0, sizeof evctx);
  93         evctx.version = DRM_EVENT_CONTEXT_VERSION;
  94         evctx.page_flip_handler = page_flip_handler;
  95         drmHandleEvent(fd, &evctx);
  96 }
  97
  98 static int
  99 init_egl(struct drm_compositor *ec, struct udev_device *device)
 100 {
 101         EGLint major, minor;
 102         const char *extensions, *filename;
 103         int fd;
 104         static const EGLint context_attribs[] = {
 105                 EGL_CONTEXT_CLIENT_VERSION, 2,
 106                 EGL_NONE
 107         };
 108
 109         filename = udev_device_get_devnode(device);
 110         fd = open(filename, O_RDWR);
 111         if (fd < 0) {
 112                 /* Probably permissions error */
 113                 fprintf(stderr, "couldn't open %s, skipping\n",
 114                         udev_device_get_devnode(device));
 115                 return -1;
 116         }
 117
 118         wlsc_drm_init(&ec->base, fd, filename);
 119
 120         ec->base.display = eglGetDRMDisplayMESA(ec->base.drm.fd);
 121         if (ec->base.display == NULL) {
 122                 fprintf(stderr, "failed to create display\n");
 123                 return -1;
 124         }
 125
 126         if (!eglInitialize(ec->base.display, &major, &minor)) {
 127                 fprintf(stderr, "failed to initialize display\n");
 128                 return -1;
 129         }
 130
 131         extensions = eglQueryString(ec->base.display, EGL_EXTENSIONS);
 132         if (!strstr(extensions, "EGL_KHR_surfaceless_opengl")) {
 133                 fprintf(stderr, "EGL_KHR_surfaceless_opengl not available\n");
 134                 return -1;
 135         }
 136
 137         if (!eglBindAPI(EGL_OPENGL_ES_API)) {
 138                 fprintf(stderr, "failed to bind api EGL_OPENGL_ES_API\n");
 139                 return -1;
 140         }
 141
 142         ec->base.context = eglCreateContext(ec->base.display, NULL,
 143                                             EGL_NO_CONTEXT, context_attribs);
 144         if (ec->base.context == NULL) {
 145                 fprintf(stderr, "failed to create context\n");
 146                 return -1;
 147         }
 148
 149         if (!eglMakeCurrent(ec->base.display, EGL_NO_SURFACE,
 150                             EGL_NO_SURFACE, ec->base.context)) {
 151                 fprintf(stderr, "failed to make context current\n");
 152                 return -1;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static drmModeModeInfo builtin_1024x768 = {
 159         63500,                  /* clock */
 160         1024, 1072, 1176, 1328, 0,
 161         768, 771, 775, 798, 0,
 162         59920,
 163         DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
 164         0,
 165         "1024x768"
 166 };
 167
 168 static int
 169 create_output_for_connector(struct drm_compositor *ec,
 170                             drmModeRes *resources,
 171                             drmModeConnector *connector)
 172 {
 173         struct drm_output *output;
 174         drmModeEncoder *encoder;
 175         drmModeModeInfo *mode;
 176         int i, ret;
 177         EGLint handle, stride, attribs[] = {
 178                 EGL_WIDTH,              0,
 179                 EGL_HEIGHT,             0,
 180                 EGL_DRM_BUFFER_FORMAT_MESA,     EGL_DRM_BUFFER_FORMAT_ARGB32_MESA,
 181                 EGL_DRM_BUFFER_USE_MESA,        EGL_DRM_BUFFER_USE_SCANOUT_MESA,
 182                 EGL_NONE
 183         };
 184
 185         output = malloc(sizeof *output);
 186         if (output == NULL)
 187                 return -1;
 188
 189         if (connector->count_modes > 0)
 190                 mode = &connector->modes[0];
 191         else
 192                 mode = &builtin_1024x768;
 193
 194         encoder = drmModeGetEncoder(ec->base.drm.fd, connector->encoders[0]);
 195         if (encoder == NULL) {
 196                 fprintf(stderr, "No encoder for connector.\n");
 197                 return -1;
 198         }
 199
 200         for (i = 0; i < resources->count_crtcs; i++) {
 201                 if (encoder->possible_crtcs & (1 << i))
 202                         break;
 203         }
 204         if (i == resources->count_crtcs) {
 205                 fprintf(stderr, "No usable crtc for encoder.\n");
 206                 return -1;
 207         }
 208
 209         memset(output, 0, sizeof *output);
 210         wlsc_output_init(&output->base, &ec->base, 0, 0,
 211                          mode->hdisplay, mode->vdisplay);
 212
 213         output->crtc_id = resources->crtcs[i];
 214         output->connector_id = connector->connector_id;
 215         output->mode = *mode;
 216
 217         drmModeFreeEncoder(encoder);
 218
 219         glGenRenderbuffers(2, output->rbo);
 220         for (i = 0; i < 2; i++) {
 221                 glBindRenderbuffer(GL_RENDERBUFFER, output->rbo[i]);
 222
 223                 attribs[1] = output->base.width;
 224                 attribs[3] = output->base.height;
 225                 output->image[i] =
 226                         eglCreateDRMImageMESA(ec->base.display, attribs);
 227                 glEGLImageTargetRenderbufferStorageOES(GL_RENDERBUFFER,
 228                                                        output->image[i]);
 229                 eglExportDRMImageMESA(ec->base.display, output->image[i],
 230                                       NULL, &handle, &stride);
 231
 232                 ret = drmModeAddFB(ec->base.drm.fd,
 233                                    output->base.width, output->base.height,
 234                                    32, 32, stride, handle, &output->fb_id[i]);
 235                 if (ret) {
 236                         fprintf(stderr, "failed to add fb %d: %m\n", i);
 237                         return -1;
 238                 }
 239         }
 240
 241         output->current = 0;
 242         glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 243                                   GL_COLOR_ATTACHMENT0,
 244                                   GL_RENDERBUFFER,
 245                                   output->rbo[output->current]);
 246         ret = drmModeSetCrtc(ec->base.drm.fd, output->crtc_id,
 247                              output->fb_id[output->current ^ 1], 0, 0,
 248                              &output->connector_id, 1, &output->mode);
 249         if (ret) {
 250                 fprintf(stderr, "failed to set mode: %m\n");
 251                 return -1;
 252         }
 253
 254         wl_list_insert(ec->base.output_list.prev, &output->base.link);
 255
 256         return 0;
 257 }
 258
 259 static int
 260 create_outputs(struct drm_compositor *ec, int option_connector)
 261 {
 262         drmModeConnector *connector;
 263         drmModeRes *resources;
 264         int i;
 265
 266         resources = drmModeGetResources(ec->base.drm.fd);
 267         if (!resources) {
 268                 fprintf(stderr, "drmModeGetResources failed\n");
 269                 return -1;
 270         }
 271
 272         for (i = 0; i < resources->count_connectors; i++) {
 273                 connector = drmModeGetConnector(ec->base.drm.fd, resources->connectors[i]);
 274                 if (connector == NULL)
 275                         continue;
 276
 277                 if (connector->connection == DRM_MODE_CONNECTED &&
 278                     (option_connector == 0 ||
 279                      connector->connector_id == option_connector))
 280                         if (create_output_for_connector(ec, resources, connector) < 0)
 281                                 return -1;
 282
 283                 drmModeFreeConnector(connector);
 284         }
 285
 286         if (wl_list_empty(&ec->base.output_list)) {
 287                 fprintf(stderr, "No currently active connector found.\n");
 288                 return -1;
 289         }
 290
 291         drmModeFreeResources(resources);
 292
 293         return 0;
 294 }
 295
 296 static int
 297 drm_authenticate(struct wlsc_compositor *c, uint32_t id)
 298 {
 299         struct drm_compositor *ec = (struct drm_compositor *) c;
 300
 301         return drmAuthMagic(ec->base.drm.fd, id);
 302 }
 303
 304 static void
 305 drm_destroy(struct wlsc_compositor *ec)
 306 {
 307         struct drm_compositor *d = (struct drm_compositor *) ec;
 308
 309         tty_destroy(d->tty);
 310
 311         free(d);
 312 }
 313
 314 struct wlsc_compositor *
 315 drm_compositor_create(struct wl_display *display, int connector)
 316 {
 317         struct drm_compositor *ec;
 318         struct udev_enumerate *e;
 319         struct udev_list_entry *entry;
 320         struct udev_device *device;
 321         const char *path;
 322         struct wl_event_loop *loop;
 323
 324         ec = malloc(sizeof *ec);
 325         if (ec == NULL)
 326                 return NULL;
 327
 328         memset(ec, 0, sizeof *ec);
 329         ec->udev = udev_new();
 330         if (ec->udev == NULL) {
 331                 fprintf(stderr, "failed to initialize udev context\n");
 332                 return NULL;
 333         }
 334
 335         e = udev_enumerate_new(ec->udev);
 336         udev_enumerate_add_match_subsystem(e, "drm");
 337         udev_enumerate_add_match_property(e, "WAYLAND_SEAT", "1");
 338         udev_enumerate_scan_devices(e);
 339         device = NULL;
 340         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 341                 path = udev_list_entry_get_name(entry);
 342                 device = udev_device_new_from_syspath(ec->udev, path);
 343                 break;
 344         }
 345         udev_enumerate_unref(e);
 346
 347         if (device == NULL) {
 348                 fprintf(stderr, "no drm device found\n");
 349                 return NULL;
 350         }
 351
 352         ec->base.wl_display = display;
 353         if (init_egl(ec, device) < 0) {
 354                 fprintf(stderr, "failed to initialize egl\n");
 355                 return NULL;
 356         }
 357
 358         ec->base.destroy = drm_destroy;
 359         ec->base.authenticate = drm_authenticate;
 360         ec->base.present = drm_compositor_present;
 361         ec->base.create_buffer = wlsc_drm_buffer_create;
 362         ec->base.focus = 1;
 363
 364         /* Can't init base class until we have a current egl context */
 365         if (wlsc_compositor_init(&ec->base, display) < 0)
 366                 return NULL;
 367
 368         if (create_outputs(ec, connector) < 0) {
 369                 fprintf(stderr, "failed to create output for %s\n", path);
 370                 return NULL;
 371         }
 372
 373         evdev_input_add_devices(&ec->base, ec->udev);
 374
 375         loop = wl_display_get_event_loop(ec->base.wl_display);
 376         ec->drm_source =
 377                 wl_event_loop_add_fd(loop, ec->base.drm.fd,
 378                                      WL_EVENT_READABLE, on_drm_input, ec);
 379         ec->tty = tty_create(&ec->base);
 380
 381         return &ec->base;
 382 }