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