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 #include <xf86drm.h>
  26 #include <xf86drmMode.h>
  27
  28 #define GL_GLEXT_PROTOTYPES
  29 #define EGL_EGLEXT_PROTOTYPES
  30 #include <GLES2/gl2.h>
  31 #include <GLES2/gl2ext.h>
  32 #include <EGL/egl.h>
  33 #include <EGL/eglext.h>
  34
  35 #include "compositor.h"
  36
  37 struct drm_compositor {
  38         struct wlsc_compositor base;
  39
  40         struct udev *udev;
  41         struct wl_event_source *drm_source;
  42
  43         struct {
  44                 int fd;
  45         } drm;
  46         uint32_t crtc_allocator;
  47         struct tty *tty;
  48 };
  49
  50 struct drm_output {
  51         struct wlsc_output   base;
  52
  53         drmModeModeInfo mode;
  54         uint32_t crtc_id;
  55         uint32_t connector_id;
  56         GLuint rbo[2];
  57         uint32_t fb_id[2];
  58         EGLImageKHR image[2];
  59         uint32_t current;
  60 };
  61
  62 static int
  63 drm_output_prepare_render(struct wlsc_output *output_base)
  64 {
  65         struct drm_output *output = (struct drm_output *) output_base;
  66
  67         glFramebufferRenderbuffer(GL_FRAMEBUFFER,
  68                                   GL_COLOR_ATTACHMENT0,
  69                                   GL_RENDERBUFFER,
  70                                   output->rbo[output->current]);
  71
  72         if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
  73                 return -1;
  74
  75         return 0;
  76 }
  77
  78 static void
  79 drm_compositor_present(struct wlsc_compositor *ec)
  80 {
  81         struct drm_compositor *c = (struct drm_compositor *) ec;
  82         struct drm_output *output;
  83
  84         wl_list_for_each(output, &ec->output_list, base.link) {
  85                 if (drm_output_prepare_render(&output->base))
  86                         continue;
  87                 glFlush();
  88
  89                 output->current ^= 1;
  90
  91                 drmModePageFlip(c->drm.fd, output->crtc_id,
  92                                 output->fb_id[output->current ^ 1],
  93                                 DRM_MODE_PAGE_FLIP_EVENT, output);
  94         }
  95 }
  96
  97 static void
  98 page_flip_handler(int fd, unsigned int frame,
  99                   unsigned int sec, unsigned int usec, void *data)
 100 {
 101         struct wlsc_output *output = data;
 102         struct wlsc_compositor *compositor = output->compositor;
 103         uint32_t msecs;
 104
 105         /* run synchronized to first output, ignore other pflip events.
 106          * FIXME: support per output/surface frame callbacks */
 107         if (output == container_of(compositor->output_list.prev,
 108                                    struct wlsc_output, link)) {
 109                 msecs = sec * 1000 + usec / 1000;
 110                 wlsc_compositor_finish_frame(compositor, msecs);
 111         }
 112 }
 113
 114 static void
 115 on_drm_input(int fd, uint32_t mask, void *data)
 116 {
 117         drmEventContext evctx;
 118
 119         memset(&evctx, 0, sizeof evctx);
 120         evctx.version = DRM_EVENT_CONTEXT_VERSION;
 121         evctx.page_flip_handler = page_flip_handler;
 122         drmHandleEvent(fd, &evctx);
 123 }
 124
 125 static int
 126 init_egl(struct drm_compositor *ec, struct udev_device *device)
 127 {
 128         EGLint major, minor;
 129         const char *extensions, *filename;
 130         int fd;
 131         static const EGLint context_attribs[] = {
 132                 EGL_CONTEXT_CLIENT_VERSION, 2,
 133                 EGL_NONE
 134         };
 135
 136         filename = udev_device_get_devnode(device);
 137         fd = open(filename, O_RDWR);
 138         if (fd < 0) {
 139                 /* Probably permissions error */
 140                 fprintf(stderr, "couldn't open %s, skipping\n",
 141                         udev_device_get_devnode(device));
 142                 return -1;
 143         }
 144
 145         ec->drm.fd = fd;
 146         ec->base.display = eglGetDRMDisplayMESA(ec->drm.fd);
 147         if (ec->base.display == NULL) {
 148                 fprintf(stderr, "failed to create display\n");
 149                 return -1;
 150         }
 151
 152         if (!eglInitialize(ec->base.display, &major, &minor)) {
 153                 fprintf(stderr, "failed to initialize display\n");
 154                 return -1;
 155         }
 156
 157         extensions = eglQueryString(ec->base.display, EGL_EXTENSIONS);
 158         if (!strstr(extensions, "EGL_KHR_surfaceless_opengl")) {
 159                 fprintf(stderr, "EGL_KHR_surfaceless_opengl not available\n");
 160                 return -1;
 161         }
 162
 163         if (!eglBindAPI(EGL_OPENGL_ES_API)) {
 164                 fprintf(stderr, "failed to bind api EGL_OPENGL_ES_API\n");
 165                 return -1;
 166         }
 167
 168         ec->base.context = eglCreateContext(ec->base.display, NULL,
 169                                             EGL_NO_CONTEXT, context_attribs);
 170         if (ec->base.context == NULL) {
 171                 fprintf(stderr, "failed to create context\n");
 172                 return -1;
 173         }
 174
 175         if (!eglMakeCurrent(ec->base.display, EGL_NO_SURFACE,
 176                             EGL_NO_SURFACE, ec->base.context)) {
 177                 fprintf(stderr, "failed to make context current\n");
 178                 return -1;
 179         }
 180
 181         return 0;
 182 }
 183
 184 static drmModeModeInfo builtin_1024x768 = {
 185         63500,                  /* clock */
 186         1024, 1072, 1176, 1328, 0,
 187         768, 771, 775, 798, 0,
 188         59920,
 189         DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
 190         0,
 191         "1024x768"
 192 };
 193
 194 static int
 195 create_output_for_connector(struct drm_compositor *ec,
 196                             drmModeRes *resources,
 197                             drmModeConnector *connector,
 198                             int x, int y)
 199 {
 200         struct drm_output *output;
 201         drmModeEncoder *encoder;
 202         drmModeModeInfo *mode;
 203         int i, ret;
 204         EGLint handle, stride, attribs[] = {
 205                 EGL_WIDTH,              0,
 206                 EGL_HEIGHT,             0,
 207                 EGL_DRM_BUFFER_FORMAT_MESA,     EGL_DRM_BUFFER_FORMAT_ARGB32_MESA,
 208                 EGL_DRM_BUFFER_USE_MESA,        EGL_DRM_BUFFER_USE_SCANOUT_MESA,
 209                 EGL_NONE
 210         };
 211
 212         output = malloc(sizeof *output);
 213         if (output == NULL)
 214                 return -1;
 215
 216         if (connector->count_modes > 0)
 217                 mode = &connector->modes[0];
 218         else
 219                 mode = &builtin_1024x768;
 220
 221         encoder = drmModeGetEncoder(ec->drm.fd, connector->encoders[0]);
 222         if (encoder == NULL) {
 223                 fprintf(stderr, "No encoder for connector.\n");
 224                 return -1;
 225         }
 226
 227         for (i = 0; i < resources->count_crtcs; i++) {
 228                 if (encoder->possible_crtcs & (1 << i) &&
 229                     !(ec->crtc_allocator & (1 << i)))
 230                         break;
 231         }
 232         if (i == resources->count_crtcs) {
 233                 fprintf(stderr, "No usable crtc for encoder.\n");
 234                 return -1;
 235         }
 236
 237         memset(output, 0, sizeof *output);
 238         wlsc_output_init(&output->base, &ec->base, x, y,
 239                          mode->hdisplay, mode->vdisplay, 0);
 240
 241         ec->crtc_allocator |= (1 << i);
 242         output->crtc_id = resources->crtcs[i];
 243         output->connector_id = connector->connector_id;
 244         output->mode = *mode;
 245
 246         drmModeFreeEncoder(encoder);
 247
 248         glGenRenderbuffers(2, output->rbo);
 249         for (i = 0; i < 2; i++) {
 250                 glBindRenderbuffer(GL_RENDERBUFFER, output->rbo[i]);
 251
 252                 attribs[1] = output->base.width;
 253                 attribs[3] = output->base.height;
 254                 output->image[i] =
 255                         eglCreateDRMImageMESA(ec->base.display, attribs);
 256                 glEGLImageTargetRenderbufferStorageOES(GL_RENDERBUFFER,
 257                                                        output->image[i]);
 258                 eglExportDRMImageMESA(ec->base.display, output->image[i],
 259                                       NULL, &handle, &stride);
 260
 261                 ret = drmModeAddFB(ec->drm.fd,
 262                                    output->base.width, output->base.height,
 263                                    32, 32, stride, handle, &output->fb_id[i]);
 264                 if (ret) {
 265                         fprintf(stderr, "failed to add fb %d: %m\n", i);
 266                         return -1;
 267                 }
 268         }
 269
 270         output->current = 0;
 271         glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 272                                   GL_COLOR_ATTACHMENT0,
 273                                   GL_RENDERBUFFER,
 274                                   output->rbo[output->current]);
 275         ret = drmModeSetCrtc(ec->drm.fd, output->crtc_id,
 276                              output->fb_id[output->current ^ 1], 0, 0,
 277                              &output->connector_id, 1, &output->mode);
 278         if (ret) {
 279                 fprintf(stderr, "failed to set mode: %m\n");
 280                 return -1;
 281         }
 282
 283         output->base.prepare_render = drm_output_prepare_render;
 284
 285         wl_list_insert(ec->base.output_list.prev, &output->base.link);
 286
 287         return 0;
 288 }
 289
 290 static int
 291 create_outputs(struct drm_compositor *ec, int option_connector)
 292 {
 293         drmModeConnector *connector;
 294         drmModeRes *resources;
 295         int i;
 296         int x = 0, y = 0;
 297
 298         resources = drmModeGetResources(ec->drm.fd);
 299         if (!resources) {
 300                 fprintf(stderr, "drmModeGetResources failed\n");
 301                 return -1;
 302         }
 303
 304         for (i = 0; i < resources->count_connectors; i++) {
 305                 connector = drmModeGetConnector(ec->drm.fd, resources->connectors[i]);
 306                 if (connector == NULL)
 307                         continue;
 308
 309                 if (connector->connection == DRM_MODE_CONNECTED &&
 310                     (option_connector == 0 ||
 311                      connector->connector_id == option_connector))
 312                         if (create_output_for_connector(ec, resources,
 313                                                         connector, x, y) < 0)
 314                                 return -1;
 315
 316                 x += container_of(ec->base.output_list.prev, struct wlsc_output,
 317                                   link)->width;
 318
 319                 drmModeFreeConnector(connector);
 320         }
 321
 322         if (wl_list_empty(&ec->base.output_list)) {
 323                 fprintf(stderr, "No currently active connector found.\n");
 324                 return -1;
 325         }
 326
 327         drmModeFreeResources(resources);
 328
 329         return 0;
 330 }
 331
 332 static void
 333 drm_destroy(struct wlsc_compositor *ec)
 334 {
 335         struct drm_compositor *d = (struct drm_compositor *) ec;
 336
 337         tty_destroy(d->tty);
 338
 339         free(d);
 340 }
 341
 342 struct wlsc_compositor *
 343 drm_compositor_create(struct wl_display *display, int connector)
 344 {
 345         struct drm_compositor *ec;
 346         struct udev_enumerate *e;
 347         struct udev_list_entry *entry;
 348         struct udev_device *device;
 349         const char *path;
 350         struct wl_event_loop *loop;
 351
 352         ec = malloc(sizeof *ec);
 353         if (ec == NULL)
 354                 return NULL;
 355
 356         memset(ec, 0, sizeof *ec);
 357         ec->udev = udev_new();
 358         if (ec->udev == NULL) {
 359                 fprintf(stderr, "failed to initialize udev context\n");
 360                 return NULL;
 361         }
 362
 363         e = udev_enumerate_new(ec->udev);
 364         udev_enumerate_add_match_subsystem(e, "drm");
 365         udev_enumerate_add_match_property(e, "WAYLAND_SEAT", "1");
 366         udev_enumerate_scan_devices(e);
 367         device = NULL;
 368         udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(e)) {
 369                 path = udev_list_entry_get_name(entry);
 370                 device = udev_device_new_from_syspath(ec->udev, path);
 371                 break;
 372         }
 373         udev_enumerate_unref(e);
 374
 375         if (device == NULL) {
 376                 fprintf(stderr, "no drm device found\n");
 377                 return NULL;
 378         }
 379
 380         ec->base.wl_display = display;
 381         if (init_egl(ec, device) < 0) {
 382                 fprintf(stderr, "failed to initialize egl\n");
 383                 return NULL;
 384         }
 385
 386         ec->base.destroy = drm_destroy;
 387         ec->base.present = drm_compositor_present;
 388         ec->base.create_buffer = wlsc_shm_buffer_create;
 389         ec->base.focus = 1;
 390
 391         glGenFramebuffers(1, &ec->base.fbo);
 392         glBindFramebuffer(GL_FRAMEBUFFER, ec->base.fbo);
 393
 394         /* Can't init base class until we have a current egl context */
 395         if (wlsc_compositor_init(&ec->base, display) < 0)
 396                 return NULL;
 397
 398         if (create_outputs(ec, connector) < 0) {
 399                 fprintf(stderr, "failed to create output for %s\n", path);
 400                 return NULL;
 401         }
 402
 403         evdev_input_add_devices(&ec->base, ec->udev);
 404
 405         loop = wl_display_get_event_loop(ec->base.wl_display);
 406         ec->drm_source =
 407                 wl_event_loop_add_fd(loop, ec->drm.fd,
 408                                      WL_EVENT_READABLE, on_drm_input, ec);
 409         ec->tty = tty_create(&ec->base);
 410
 411         return &ec->base;
 412 }