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 void
  63 drm_compositor_present(struct wlsc_compositor *ec)
  64 {
  65         struct drm_compositor *c = (struct drm_compositor *) ec;
  66         struct drm_output *output;
  67
  68         wl_list_for_each(output, &ec->output_list, base.link) {
  69                 output->current ^= 1;
  70
  71                 glFramebufferRenderbuffer(GL_FRAMEBUFFER,
  72                                           GL_COLOR_ATTACHMENT0,
  73                                           GL_RENDERBUFFER,
  74                                           output->rbo[output->current]);
  75                 glFlush();
  76
  77                 drmModePageFlip(c->drm.fd, output->crtc_id,
  78                                 output->fb_id[output->current ^ 1],
  79                                 DRM_MODE_PAGE_FLIP_EVENT, output);
  80         }
  81 }
  82
  83 static void
  84 page_flip_handler(int fd, unsigned int frame,
  85                   unsigned int sec, unsigned int usec, void *data)
  86 {
  87         struct wlsc_output *output = data;
  88         struct wlsc_compositor *compositor = output->compositor;
  89         uint32_t msecs;
  90
  91         msecs = sec * 1000 + usec / 1000;
  92         wlsc_compositor_finish_frame(compositor, msecs);
  93 }
  94
  95 static void
  96 on_drm_input(int fd, uint32_t mask, void *data)
  97 {
  98         drmEventContext evctx;
  99
 100         memset(&evctx, 0, sizeof evctx);
 101         evctx.version = DRM_EVENT_CONTEXT_VERSION;
 102         evctx.page_flip_handler = page_flip_handler;
 103         drmHandleEvent(fd, &evctx);
 104 }
 105
 106 static int
 107 init_egl(struct drm_compositor *ec, struct udev_device *device)
 108 {
 109         EGLint major, minor;
 110         const char *extensions, *filename;
 111         int fd;
 112         static const EGLint context_attribs[] = {
 113                 EGL_CONTEXT_CLIENT_VERSION, 2,
 114                 EGL_NONE
 115         };
 116
 117         filename = udev_device_get_devnode(device);
 118         fd = open(filename, O_RDWR);
 119         if (fd < 0) {
 120                 /* Probably permissions error */
 121                 fprintf(stderr, "couldn't open %s, skipping\n",
 122                         udev_device_get_devnode(device));
 123                 return -1;
 124         }
 125
 126         ec->drm.fd = fd;
 127         ec->base.display = eglGetDRMDisplayMESA(ec->drm.fd);
 128         if (ec->base.display == NULL) {
 129                 fprintf(stderr, "failed to create display\n");
 130                 return -1;
 131         }
 132
 133         if (!eglInitialize(ec->base.display, &major, &minor)) {
 134                 fprintf(stderr, "failed to initialize display\n");
 135                 return -1;
 136         }
 137
 138         extensions = eglQueryString(ec->base.display, EGL_EXTENSIONS);
 139         if (!strstr(extensions, "EGL_KHR_surfaceless_opengl")) {
 140                 fprintf(stderr, "EGL_KHR_surfaceless_opengl not available\n");
 141                 return -1;
 142         }
 143
 144         if (!eglBindAPI(EGL_OPENGL_ES_API)) {
 145                 fprintf(stderr, "failed to bind api EGL_OPENGL_ES_API\n");
 146                 return -1;
 147         }
 148
 149         ec->base.context = eglCreateContext(ec->base.display, NULL,
 150                                             EGL_NO_CONTEXT, context_attribs);
 151         if (ec->base.context == NULL) {
 152                 fprintf(stderr, "failed to create context\n");
 153                 return -1;
 154         }
 155
 156         if (!eglMakeCurrent(ec->base.display, EGL_NO_SURFACE,
 157                             EGL_NO_SURFACE, ec->base.context)) {
 158                 fprintf(stderr, "failed to make context current\n");
 159                 return -1;
 160         }
 161
 162         return 0;
 163 }
 164
 165 static drmModeModeInfo builtin_1024x768 = {
 166         63500,                  /* clock */
 167         1024, 1072, 1176, 1328, 0,
 168         768, 771, 775, 798, 0,
 169         59920,
 170         DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
 171         0,
 172         "1024x768"
 173 };
 174
 175 static int
 176 create_output_for_connector(struct drm_compositor *ec,
 177                             drmModeRes *resources,
 178                             drmModeConnector *connector)
 179 {
 180         struct drm_output *output;
 181         drmModeEncoder *encoder;
 182         drmModeModeInfo *mode;
 183         int i, ret;
 184         EGLint handle, stride, attribs[] = {
 185                 EGL_WIDTH,              0,
 186                 EGL_HEIGHT,             0,
 187                 EGL_DRM_BUFFER_FORMAT_MESA,     EGL_DRM_BUFFER_FORMAT_ARGB32_MESA,
 188                 EGL_DRM_BUFFER_USE_MESA,        EGL_DRM_BUFFER_USE_SCANOUT_MESA,
 189                 EGL_NONE
 190         };
 191
 192         output = malloc(sizeof *output);
 193         if (output == NULL)
 194                 return -1;
 195
 196         if (connector->count_modes > 0)
 197                 mode = &connector->modes[0];
 198         else
 199                 mode = &builtin_1024x768;
 200
 201         encoder = drmModeGetEncoder(ec->drm.fd, connector->encoders[0]);
 202         if (encoder == NULL) {
 203                 fprintf(stderr, "No encoder for connector.\n");
 204                 return -1;
 205         }
 206
 207         for (i = 0; i < resources->count_crtcs; i++) {
 208                 if (encoder->possible_crtcs & (1 << i) &&
 209                     !(ec->crtc_allocator & (1 << i)))
 210                         break;
 211         }
 212         if (i == resources->count_crtcs) {
 213                 fprintf(stderr, "No usable crtc for encoder.\n");
 214                 return -1;
 215         }
 216
 217         memset(output, 0, sizeof *output);
 218         wlsc_output_init(&output->base, &ec->base, 0, 0,
 219                          mode->hdisplay, mode->vdisplay, 0);
 220
 221         ec->crtc_allocator |= (1 << i);
 222         output->crtc_id = resources->crtcs[i];
 223         output->connector_id = connector->connector_id;
 224         output->mode = *mode;
 225
 226         drmModeFreeEncoder(encoder);
 227
 228         glGenRenderbuffers(2, output->rbo);
 229         for (i = 0; i < 2; i++) {
 230                 glBindRenderbuffer(GL_RENDERBUFFER, output->rbo[i]);
 231
 232                 attribs[1] = output->base.width;
 233                 attribs[3] = output->base.height;
 234                 output->image[i] =
 235                         eglCreateDRMImageMESA(ec->base.display, attribs);
 236                 glEGLImageTargetRenderbufferStorageOES(GL_RENDERBUFFER,
 237                                                        output->image[i]);
 238                 eglExportDRMImageMESA(ec->base.display, output->image[i],
 239                                       NULL, &handle, &stride);
 240
 241                 ret = drmModeAddFB(ec->drm.fd,
 242                                    output->base.width, output->base.height,
 243                                    32, 32, stride, handle, &output->fb_id[i]);
 244                 if (ret) {
 245                         fprintf(stderr, "failed to add fb %d: %m\n", i);
 246                         return -1;
 247                 }
 248         }
 249
 250         output->current = 0;
 251         glFramebufferRenderbuffer(GL_FRAMEBUFFER,
 252                                   GL_COLOR_ATTACHMENT0,
 253                                   GL_RENDERBUFFER,
 254                                   output->rbo[output->current]);
 255         ret = drmModeSetCrtc(ec->drm.fd, output->crtc_id,
 256                              output->fb_id[output->current ^ 1], 0, 0,
 257                              &output->connector_id, 1, &output->mode);
 258         if (ret) {
 259                 fprintf(stderr, "failed to set mode: %m\n");
 260                 return -1;
 261         }
 262
 263         wl_list_insert(ec->base.output_list.prev, &output->base.link);
 264
 265         return 0;
 266 }
 267
 268 static int
 269 create_outputs(struct drm_compositor *ec, int option_connector)
 270 {
 271         drmModeConnector *connector;
 272         drmModeRes *resources;
 273         int i;
 274
 275         resources = drmModeGetResources(ec->drm.fd);
 276         if (!resources) {
 277                 fprintf(stderr, "drmModeGetResources failed\n");
 278                 return -1;
 279         }
 280
 281         for (i = 0; i < resources->count_connectors; i++) {
 282                 connector = drmModeGetConnector(ec->drm.fd, resources->connectors[i]);
 283                 if (connector == NULL)
 284                         continue;
 285
 286                 if (connector->connection == DRM_MODE_CONNECTED &&
 287                     (option_connector == 0 ||
 288                      connector->connector_id == option_connector))
 289                         if (create_output_for_connector(ec, resources, connector) < 0)
 290                                 return -1;
 291
 292                 drmModeFreeConnector(connector);
 293         }
 294
 295         if (wl_list_empty(&ec->base.output_list)) {
 296                 fprintf(stderr, "No currently active connector found.\n");
 297                 return -1;
 298         }
 299
 300         drmModeFreeResources(resources);
 301
 302         return 0;
 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.present = drm_compositor_present;
 361         ec->base.create_buffer = wlsc_shm_buffer_create;
 362         ec->base.focus = 1;
 363
 364         glGenFramebuffers(1, &ec->base.fbo);
 365         glBindFramebuffer(GL_FRAMEBUFFER, ec->base.fbo);
 366
 367         /* Can't init base class until we have a current egl context */
 368         if (wlsc_compositor_init(&ec->base, display) < 0)
 369                 return NULL;
 370
 371         if (create_outputs(ec, connector) < 0) {
 372                 fprintf(stderr, "failed to create output for %s\n", path);
 373                 return NULL;
 374         }
 375
 376         evdev_input_add_devices(&ec->base, ec->udev);
 377
 378         loop = wl_display_get_event_loop(ec->base.wl_display);
 379         ec->drm_source =
 380                 wl_event_loop_add_fd(loop, ec->drm.fd,
 381                                      WL_EVENT_READABLE, on_drm_input, ec);
 382         ec->tty = tty_create(&ec->base);
 383
 384         return &ec->base;
 385 }