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