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                 glFlush();
  69
  70                 drmModePageFlip(c->base.drm.fd, output->crtc_id,
  71                                 output->fb_id[output->current ^ 1],
  72                                 DRM_MODE_PAGE_FLIP_EVENT, output);
  73         }
  74 }
  75
  76 static void
  77 page_flip_handler(int fd, unsigned int frame,
  78                   unsigned int sec, unsigned int usec, void *data)
  79 {
  80         struct wlsc_output *output = data;
  81         struct wlsc_compositor *compositor = output->compositor;
  82         uint32_t msecs;
  83
  84         msecs = sec * 1000 + usec / 1000;
  85         wlsc_compositor_finish_frame(compositor, msecs);
  86 }
  87
  88 static void
  89 on_drm_input(int fd, uint32_t mask, void *data)
  90 {
  91         drmEventContext evctx;
  92
  93         memset(&evctx, 0, sizeof evctx);
  94         evctx.version = DRM_EVENT_CONTEXT_VERSION;
  95         evctx.page_flip_handler = page_flip_handler;
  96         drmHandleEvent(fd, &evctx);
  97 }
  98
  99 static int
 100 init_egl(struct drm_compositor *ec, struct udev_device *device)
 101 {
 102         EGLint major, minor;
 103         const char *extensions, *filename;
 104         int fd;
 105         static const EGLint context_attribs[] = {
 106                 EGL_CONTEXT_CLIENT_VERSION, 2,
 107                 EGL_NONE
 108         };
 109
 110         filename = udev_device_get_devnode(device);
 111         fd = open(filename, O_RDWR);
 112         if (fd < 0) {
 113                 /* Probably permissions error */
 114                 fprintf(stderr, "couldn't open %s, skipping\n",
 115                         udev_device_get_devnode(device));
 116                 return -1;
 117         }
 118
 119         wlsc_drm_init(&ec->base, fd, filename);
 120
 121         ec->base.display = eglGetDRMDisplayMESA(ec->base.drm.fd);
 122         if (ec->base.display == NULL) {
 123                 fprintf(stderr, "failed to create display\n");
 124                 return -1;
 125         }
 126
 127         if (!eglInitialize(ec->base.display, &major, &minor)) {
 128                 fprintf(stderr, "failed to initialize display\n");
 129                 return -1;
 130         }
 131
 132         extensions = eglQueryString(ec->base.display, EGL_EXTENSIONS);
 133         if (!strstr(extensions, "EGL_KHR_surfaceless_opengl")) {
 134                 fprintf(stderr, "EGL_KHR_surfaceless_opengl not available\n");
 135                 return -1;
 136         }
 137
 138         if (!eglBindAPI(EGL_OPENGL_ES_API)) {
 139                 fprintf(stderr, "failed to bind api EGL_OPENGL_ES_API\n");
 140                 return -1;
 141         }
 142
 143         ec->base.context = eglCreateContext(ec->base.display, NULL,
 144                                             EGL_NO_CONTEXT, context_attribs);
 145         if (ec->base.context == NULL) {
 146                 fprintf(stderr, "failed to create context\n");
 147                 return -1;
 148         }
 149
 150         if (!eglMakeCurrent(ec->base.display, EGL_NO_SURFACE,
 151                             EGL_NO_SURFACE, ec->base.context)) {
 152                 fprintf(stderr, "failed to make context current\n");
 153                 return -1;
 154         }
 155
 156         return 0;
 157 }
 158
 159 static drmModeModeInfo builtin_1024x768 = {
 160         63500,                  /* clock */
 161         1024, 1072, 1176, 1328, 0,
 162         768, 771, 775, 798, 0,
 163         59920,
 164         DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
 165         0,
 166         "1024x768"
 167 };
 168
 169 static int
 170 create_output_for_connector(struct drm_compositor *ec,
 171                             drmModeRes *resources,
 172                             drmModeConnector *connector)
 173 {
 174         struct drm_output *output;
 175         drmModeEncoder *encoder;
 176         drmModeModeInfo *mode;
 177         int i, ret;
 178         EGLint handle, stride, attribs[] = {
 179                 EGL_WIDTH,              0,
 180                 EGL_HEIGHT,             0,
 181                 EGL_DRM_BUFFER_FORMAT_MESA,     EGL_DRM_BUFFER_FORMAT_ARGB32_MESA,
 182                 EGL_DRM_BUFFER_USE_MESA,        EGL_DRM_BUFFER_USE_SCANOUT_MESA,
 183                 EGL_NONE
 184         };
 185
 186         output = malloc(sizeof *output);
 187         if (output == NULL)
 188                 return -1;
 189
 190         if (connector->count_modes > 0)
 191                 mode = &connector->modes[0];
 192         else
 193                 mode = &builtin_1024x768;
 194
 195         encoder = drmModeGetEncoder(ec->base.drm.fd, connector->encoders[0]);
 196         if (encoder == NULL) {
 197                 fprintf(stderr, "No encoder for connector.\n");
 198                 return -1;
 199         }
 200
 201         for (i = 0; i < resources->count_crtcs; i++) {
 202                 if (encoder->possible_crtcs & (1 << i))
 203                         break;
 204         }
 205         if (i == resources->count_crtcs) {
 206                 fprintf(stderr, "No usable crtc for encoder.\n");
 207                 return -1;
 208         }
 209
 210         memset(output, 0, sizeof *output);
 211         wlsc_output_init(&output->base, &ec->base, 0, 0,
 212                          mode->hdisplay, mode->vdisplay);
 213
 214         output->crtc_id = resources->crtcs[i];
 215         output->connector_id = connector->connector_id;
 216         output->mode = *mode;
 217
 218         drmModeFreeEncoder(encoder);
 219
 220         glGenRenderbuffers(2, output->rbo);
 221         for (i = 0; i < 2; i++) {
 222                 glBindRenderbuffer(GL_RENDERBUFFER, output->rbo[i]);
 223
 224                 attribs[1] = output->base.width;
 225                 attribs[3] = output->base.height;
 226                 output->image[i] =
 227                         eglCreateDRMImageMESA(ec->base.display, attribs);
 228                 glEGLImageTargetRenderbufferStorageOES(GL_RENDERBUFFER,
 229                                                        output->image[i]);
 230                 eglExportDRMImageMESA(ec->base.display, output->image[i],
 231                                       NULL, &handle, &stride);
 232
 233                 ret = drmModeAddFB(ec->base.drm.fd,
 234                                    output->base.width, output->base.height,
 235                                    32, 32, stride, handle, &output->fb_id[i]);
 236                 if (ret) {
 237                         fprintf(stderr, "failed to add fb %d: %m\n", i);
 238                         return -1;
 239                 }
 240         }
 241
 242         output->current = 0;
 243         glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 244                                   GL_COLOR_ATTACHMENT0,
 245                                   GL_RENDERBUFFER,
 246                                   output->rbo[output->current]);
 247         ret = drmModeSetCrtc(ec->base.drm.fd, output->crtc_id,
 248                              output->fb_id[output->current ^ 1], 0, 0,
 249                              &output->connector_id, 1, &output->mode);
 250         if (ret) {
 251                 fprintf(stderr, "failed to set mode: %m\n");
 252                 return -1;
 253         }
 254
 255         wl_list_insert(ec->base.output_list.prev, &output->base.link);
 256
 257         return 0;
 258 }
 259
 260 static int
 261 create_outputs(struct drm_compositor *ec, int option_connector)
 262 {
 263         drmModeConnector *connector;
 264         drmModeRes *resources;
 265         int i;
 266
 267         resources = drmModeGetResources(ec->base.drm.fd);
 268         if (!resources) {
 269                 fprintf(stderr, "drmModeGetResources failed\n");
 270                 return -1;
 271         }
 272
 273         for (i = 0; i < resources->count_connectors; i++) {
 274                 connector = drmModeGetConnector(ec->base.drm.fd, resources->connectors[i]);
 275                 if (connector == NULL)
 276                         continue;
 277
 278                 if (connector->connection == DRM_MODE_CONNECTED &&
 279                     (option_connector == 0 ||
 280                      connector->connector_id == option_connector))
 281                         if (create_output_for_connector(ec, resources, connector) < 0)
 282                                 return -1;
 283
 284                 drmModeFreeConnector(connector);
 285         }
 286
 287         if (wl_list_empty(&ec->base.output_list)) {
 288                 fprintf(stderr, "No currently active connector found.\n");
 289                 return -1;
 290         }
 291
 292         drmModeFreeResources(resources);
 293
 294         return 0;
 295 }
 296
 297 static int
 298 drm_authenticate(struct wlsc_compositor *c, uint32_t id)
 299 {
 300         struct drm_compositor *ec = (struct drm_compositor *) c;
 301
 302         return drmAuthMagic(ec->base.drm.fd, id);
 303 }
 304
 305 static void
 306 drm_destroy(struct wlsc_compositor *ec)
 307 {
 308         struct drm_compositor *d = (struct drm_compositor *) ec;
 309
 310         tty_destroy(d->tty);
 311
 312         free(d);
 313 }
 314
 315 struct wlsc_compositor *
 316 drm_compositor_create(struct wl_display *display, int connector)
 317 {
 318         struct drm_compositor *ec;
 319         struct udev_enumerate *e;
 320         struct udev_list_entry *entry;
 321         struct udev_device *device;
 322         const char *path;
 323         struct wl_event_loop *loop;
 324
 325         ec = malloc(sizeof *ec);
 326         if (ec == NULL)
 327                 return NULL;
 328
 329         memset(ec, 0, sizeof *ec);
 330         ec->udev = udev_new();
 331         if (ec->udev == NULL) {
 332                 fprintf(stderr, "failed to initialize udev context\n");
 333                 return NULL;
 334         }
 335
 336         e = udev_enumerate_new(ec->udev);
 337         udev_enumerate_add_match_subsystem(e, "drm");
 338         udev_enumerate_add_match_property(e, "WAYLAND_SEAT", "1");
 339         udev_enumerate_scan_devices(e);
 340         device = NULL;
 341         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 342                 path = udev_list_entry_get_name(entry);
 343                 device = udev_device_new_from_syspath(ec->udev, path);
 344                 break;
 345         }
 346         udev_enumerate_unref(e);
 347
 348         if (device == NULL) {
 349                 fprintf(stderr, "no drm device found\n");
 350                 return NULL;
 351         }
 352
 353         ec->base.wl_display = display;
 354         if (init_egl(ec, device) < 0) {
 355                 fprintf(stderr, "failed to initialize egl\n");
 356                 return NULL;
 357         }
 358
 359         ec->base.destroy = drm_destroy;
 360         ec->base.authenticate = drm_authenticate;
 361         ec->base.present = drm_compositor_present;
 362         ec->base.create_buffer = wlsc_drm_buffer_create;
 363         ec->base.focus = 1;
 364
 365         /* Can't init base class until we have a current egl context */
 366         if (wlsc_compositor_init(&ec->base, display) < 0)
 367                 return NULL;
 368
 369         if (create_outputs(ec, connector) < 0) {
 370                 fprintf(stderr, "failed to create output for %s\n", path);
 371                 return NULL;
 372         }
 373
 374         evdev_input_add_devices(&ec->base, ec->udev);
 375
 376         loop = wl_display_get_event_loop(ec->base.wl_display);
 377         ec->drm_source =
 378                 wl_event_loop_add_fd(loop, ec->base.drm.fd,
 379                                      WL_EVENT_READABLE, on_drm_input, ec);
 380         ec->tty = tty_create(&ec->base);
 381
 382         return &ec->base;
 383 }