src/egl/drivers/dri2/platform_x11_dri3.c

   1 /*
   2  * Copyright © 2015 Boyan Ding
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that copyright
   7  * notice and this permission notice appear in supporting documentation, and
   8  * that the name of the copyright holders not be used in advertising or
   9  * publicity pertaining to distribution of the software without specific,
  10  * written prior permission.  The copyright holders make no representations
  11  * about the suitability of this software for any purpose.  It is provided "as
  12  * is" without express or implied warranty.
  13  *
  14  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  15  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  16  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  17  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  18  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  19  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  20  * OF THIS SOFTWARE.
  21  */
  22
  23 #include <stdbool.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27
  28 #include <xcb/xcb.h>
  29 #include <xcb/dri3.h>
  30 #include <xcb/present.h>
  31
  32 #include <xf86drm.h>
  33 #include "util/macros.h"
  34
  35 #include "egl_dri2.h"
  36 #include "platform_x11_dri3.h"
  37
  38 #include "loader.h"
  39 #include "loader_dri3_helper.h"
  40
  41 static struct dri3_egl_surface *
  42 loader_drawable_to_egl_surface(struct loader_dri3_drawable *draw) {
  43    size_t offset = offsetof(struct dri3_egl_surface, loader_drawable);
  44    return (struct dri3_egl_surface *)(((void*) draw) - offset);
  45 }
  46
  47 static void
  48 egl_dri3_set_drawable_size(struct loader_dri3_drawable *draw,
  49                            int width, int height)
  50 {
  51    struct dri3_egl_surface *dri3_surf = loader_drawable_to_egl_surface(draw);
  52
  53    dri3_surf->surf.base.Width = width;
  54    dri3_surf->surf.base.Height = height;
  55 }
  56
  57 static bool
  58 egl_dri3_in_current_context(struct loader_dri3_drawable *draw)
  59 {
  60    struct dri3_egl_surface *dri3_surf = loader_drawable_to_egl_surface(draw);
  61    _EGLContext *ctx = _eglGetCurrentContext();
  62
  63    return ctx->Resource.Display == dri3_surf->surf.base.Resource.Display;
  64 }
  65
  66 static __DRIcontext *
  67 egl_dri3_get_dri_context(struct loader_dri3_drawable *draw)
  68 {
  69    _EGLContext *ctx = _eglGetCurrentContext();
  70    struct dri2_egl_context *dri2_ctx;
  71    if (!ctx)
  72       return NULL;
  73    dri2_ctx = dri2_egl_context(ctx);
  74    return dri2_ctx->dri_context;
  75 }
  76
  77 static __DRIscreen *
  78 egl_dri3_get_dri_screen(void)
  79 {
  80    _EGLContext *ctx = _eglGetCurrentContext();
  81    struct dri2_egl_context *dri2_ctx;
  82    if (!ctx)
  83       return NULL;
  84    dri2_ctx = dri2_egl_context(ctx);
  85    return dri2_egl_display(dri2_ctx->base.Resource.Display)->dri_screen;
  86 }
  87
  88 static void
  89 egl_dri3_flush_drawable(struct loader_dri3_drawable *draw, unsigned flags)
  90 {
  91    struct dri3_egl_surface *dri3_surf = loader_drawable_to_egl_surface(draw);
  92    _EGLDisplay *disp = dri3_surf->surf.base.Resource.Display;
  93
  94    dri2_flush_drawable_for_swapbuffers(disp, &dri3_surf->surf.base);
  95 }
  96
  97 static const struct loader_dri3_vtable egl_dri3_vtable = {
  98    .set_drawable_size = egl_dri3_set_drawable_size,
  99    .in_current_context = egl_dri3_in_current_context,
 100    .get_dri_context = egl_dri3_get_dri_context,
 101    .get_dri_screen = egl_dri3_get_dri_screen,
 102    .flush_drawable = egl_dri3_flush_drawable,
 103    .show_fps = NULL,
 104 };
 105
 106 static EGLBoolean
 107 dri3_destroy_surface(_EGLDisplay *disp, _EGLSurface *surf)
 108 {
 109    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 110    struct dri3_egl_surface *dri3_surf = dri3_egl_surface(surf);
 111    xcb_drawable_t drawable = dri3_surf->loader_drawable.drawable;
 112
 113    loader_dri3_drawable_fini(&dri3_surf->loader_drawable);
 114
 115    if (surf->Type == EGL_PBUFFER_BIT)
 116       xcb_free_pixmap (dri2_dpy->conn, drawable);
 117
 118    dri2_fini_surface(surf);
 119    free(surf);
 120
 121    return EGL_TRUE;
 122 }
 123
 124 static EGLBoolean
 125 dri3_set_swap_interval(_EGLDisplay *disp, _EGLSurface *surf, EGLint interval)
 126 {
 127    struct dri3_egl_surface *dri3_surf = dri3_egl_surface(surf);
 128
 129    dri3_surf->surf.base.SwapInterval = interval;
 130    loader_dri3_set_swap_interval(&dri3_surf->loader_drawable, interval);
 131
 132    return EGL_TRUE;
 133 }
 134
 135 static _EGLSurface *
 136 dri3_create_surface(_EGLDisplay *disp, EGLint type, _EGLConfig *conf,
 137                     void *native_surface, const EGLint *attrib_list)
 138 {
 139    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 140    struct dri2_egl_config *dri2_conf = dri2_egl_config(conf);
 141    struct dri3_egl_surface *dri3_surf;
 142    const __DRIconfig *dri_config;
 143    xcb_drawable_t drawable;
 144
 145    dri3_surf = calloc(1, sizeof *dri3_surf);
 146    if (!dri3_surf) {
 147       _eglError(EGL_BAD_ALLOC, "dri3_create_surface");
 148       return NULL;
 149    }
 150
 151    if (!dri2_init_surface(&dri3_surf->surf.base, disp, type, conf,
 152                           attrib_list, false, native_surface))
 153       goto cleanup_surf;
 154
 155    if (type == EGL_PBUFFER_BIT) {
 156       drawable = xcb_generate_id(dri2_dpy->conn);
 157       xcb_create_pixmap(dri2_dpy->conn, conf->BufferSize,
 158                         drawable, dri2_dpy->screen->root,
 159                         dri3_surf->surf.base.Width, dri3_surf->surf.base.Height);
 160    } else {
 161       STATIC_ASSERT(sizeof(uintptr_t) == sizeof(native_surface));
 162       drawable = (uintptr_t) native_surface;
 163    }
 164
 165    dri_config = dri2_get_dri_config(dri2_conf, type,
 166                                     dri3_surf->surf.base.GLColorspace);
 167
 168    if (!dri_config) {
 169       _eglError(EGL_BAD_MATCH, "Unsupported surfacetype/colorspace configuration");
 170       goto cleanup_pixmap;
 171    }
 172
 173    if (loader_dri3_drawable_init(dri2_dpy->conn, drawable,
 174                                  dri2_dpy->dri_screen,
 175                                  dri2_dpy->is_different_gpu,
 176                                  dri2_dpy->multibuffers_available,
 177                                  dri_config,
 178                                  &dri2_dpy->loader_dri3_ext,
 179                                  &egl_dri3_vtable,
 180                                  &dri3_surf->loader_drawable)) {
 181       _eglError(EGL_BAD_ALLOC, "dri3_surface_create");
 182       goto cleanup_pixmap;
 183    }
 184
 185    return &dri3_surf->surf.base;
 186
 187  cleanup_pixmap:
 188    if (type == EGL_PBUFFER_BIT)
 189       xcb_free_pixmap(dri2_dpy->conn, drawable);
 190  cleanup_surf:
 191    free(dri3_surf);
 192
 193    return NULL;
 194 }
 195
 196 static int
 197 dri3_authenticate(_EGLDisplay *disp, uint32_t id)
 198 {
 199 #ifdef HAVE_WAYLAND_PLATFORM
 200    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 201
 202    if (dri2_dpy->device_name) {
 203       _eglLog(_EGL_WARNING,
 204               "Wayland client render node authentication is unnecessary");
 205       return 0;
 206    }
 207
 208    _eglLog(_EGL_WARNING,
 209            "Wayland client primary node authentication isn't supported");
 210 #endif
 211
 212    return -1;
 213 }
 214
 215 /**
 216  * Called via eglCreateWindowSurface(), drv->CreateWindowSurface().
 217  */
 218 static _EGLSurface *
 219 dri3_create_window_surface(_EGLDisplay *disp, _EGLConfig *conf,
 220                            void *native_window, const EGLint *attrib_list)
 221 {
 222    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 223    _EGLSurface *surf;
 224
 225    surf = dri3_create_surface(disp, EGL_WINDOW_BIT, conf,
 226                               native_window, attrib_list);
 227    if (surf != NULL)
 228       dri3_set_swap_interval(disp, surf, dri2_dpy->default_swap_interval);
 229
 230    return surf;
 231 }
 232
 233 static _EGLSurface *
 234 dri3_create_pixmap_surface(_EGLDisplay *disp, _EGLConfig *conf,
 235                            void *native_pixmap, const EGLint *attrib_list)
 236 {
 237    return dri3_create_surface(disp, EGL_PIXMAP_BIT, conf,
 238                               native_pixmap, attrib_list);
 239 }
 240
 241 static _EGLSurface *
 242 dri3_create_pbuffer_surface(_EGLDisplay *disp, _EGLConfig *conf,
 243                             const EGLint *attrib_list)
 244 {
 245    return dri3_create_surface(disp, EGL_PBUFFER_BIT, conf,
 246                               NULL, attrib_list);
 247 }
 248
 249 static EGLBoolean
 250 dri3_get_sync_values(_EGLDisplay *display, _EGLSurface *surface,
 251                      EGLuint64KHR *ust, EGLuint64KHR *msc,
 252                      EGLuint64KHR *sbc)
 253 {
 254    struct dri3_egl_surface *dri3_surf = dri3_egl_surface(surface);
 255
 256    return loader_dri3_wait_for_msc(&dri3_surf->loader_drawable, 0, 0, 0,
 257                                    (int64_t *) ust, (int64_t *) msc,
 258                                    (int64_t *) sbc) ? EGL_TRUE : EGL_FALSE;
 259 }
 260
 261 static _EGLImage *
 262 dri3_create_image_khr_pixmap(_EGLDisplay *disp, _EGLContext *ctx,
 263                              EGLClientBuffer buffer, const EGLint *attr_list)
 264 {
 265    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 266    struct dri2_egl_image *dri2_img;
 267    xcb_drawable_t drawable;
 268    xcb_dri3_buffer_from_pixmap_cookie_t bp_cookie;
 269    xcb_dri3_buffer_from_pixmap_reply_t  *bp_reply;
 270    unsigned int format;
 271
 272    drawable = (xcb_drawable_t) (uintptr_t) buffer;
 273    bp_cookie = xcb_dri3_buffer_from_pixmap(dri2_dpy->conn, drawable);
 274    bp_reply = xcb_dri3_buffer_from_pixmap_reply(dri2_dpy->conn,
 275                                                 bp_cookie, NULL);
 276    if (!bp_reply) {
 277       _eglError(EGL_BAD_ALLOC, "xcb_dri3_buffer_from_pixmap");
 278       return NULL;
 279    }
 280
 281    format = dri2_format_for_depth(dri2_dpy, bp_reply->depth);
 282    if (format == __DRI_IMAGE_FORMAT_NONE) {
 283       _eglError(EGL_BAD_PARAMETER,
 284                 "dri3_create_image_khr: unsupported pixmap depth");
 285       free(bp_reply);
 286       return EGL_NO_IMAGE_KHR;
 287    }
 288
 289    dri2_img = malloc(sizeof *dri2_img);
 290    if (!dri2_img) {
 291       _eglError(EGL_BAD_ALLOC, "dri3_create_image_khr");
 292       free(bp_reply);
 293       return EGL_NO_IMAGE_KHR;
 294    }
 295
 296    _eglInitImage(&dri2_img->base, disp);
 297
 298    dri2_img->dri_image = loader_dri3_create_image(dri2_dpy->conn,
 299                                                   bp_reply,
 300                                                   format,
 301                                                   dri2_dpy->dri_screen,
 302                                                   dri2_dpy->image,
 303                                                   dri2_img);
 304
 305    free(bp_reply);
 306
 307    return &dri2_img->base;
 308 }
 309
 310 #ifdef HAVE_DRI3_MODIFIERS
 311 static _EGLImage *
 312 dri3_create_image_khr_pixmap_from_buffers(_EGLDisplay *disp, _EGLContext *ctx,
 313                                           EGLClientBuffer buffer,
 314                                           const EGLint *attr_list)
 315 {
 316    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 317    struct dri2_egl_image *dri2_img;
 318    xcb_dri3_buffers_from_pixmap_cookie_t bp_cookie;
 319    xcb_dri3_buffers_from_pixmap_reply_t  *bp_reply;
 320    xcb_drawable_t drawable;
 321    unsigned int format;
 322
 323    drawable = (xcb_drawable_t) (uintptr_t) buffer;
 324    bp_cookie = xcb_dri3_buffers_from_pixmap(dri2_dpy->conn, drawable);
 325    bp_reply = xcb_dri3_buffers_from_pixmap_reply(dri2_dpy->conn,
 326                                                  bp_cookie, NULL);
 327
 328    if (!bp_reply) {
 329       _eglError(EGL_BAD_ATTRIBUTE, "dri3_create_image_khr");
 330       return EGL_NO_IMAGE_KHR;
 331    }
 332
 333    format = dri2_format_for_depth(dri2_dpy, bp_reply->depth);
 334    if (format == __DRI_IMAGE_FORMAT_NONE) {
 335       _eglError(EGL_BAD_PARAMETER,
 336                 "dri3_create_image_khr: unsupported pixmap depth");
 337       free(bp_reply);
 338       return EGL_NO_IMAGE_KHR;
 339    }
 340
 341    dri2_img = malloc(sizeof *dri2_img);
 342    if (!dri2_img) {
 343       _eglError(EGL_BAD_ALLOC, "dri3_create_image_khr");
 344       free(bp_reply);
 345       return EGL_NO_IMAGE_KHR;
 346    }
 347
 348    _eglInitImage(&dri2_img->base, disp);
 349
 350    dri2_img->dri_image = loader_dri3_create_image_from_buffers(dri2_dpy->conn,
 351                                                                bp_reply,
 352                                                                format,
 353                                                                dri2_dpy->dri_screen,
 354                                                                dri2_dpy->image,
 355                                                                dri2_img);
 356    free(bp_reply);
 357
 358    if (!dri2_img->dri_image) {
 359       _eglError(EGL_BAD_ATTRIBUTE, "dri3_create_image_khr");
 360       free(dri2_img);
 361       return EGL_NO_IMAGE_KHR;
 362    }
 363
 364    return &dri2_img->base;
 365 }
 366 #endif
 367
 368 static _EGLImage *
 369 dri3_create_image_khr(_EGLDisplay *disp, _EGLContext *ctx, EGLenum target,
 370                       EGLClientBuffer buffer, const EGLint *attr_list)
 371 {
 372 #ifdef HAVE_DRI3_MODIFIERS
 373    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 374 #endif
 375
 376    switch (target) {
 377    case EGL_NATIVE_PIXMAP_KHR:
 378 #ifdef HAVE_DRI3_MODIFIERS
 379       if (dri2_dpy->multibuffers_available)
 380          return dri3_create_image_khr_pixmap_from_buffers(disp, ctx, buffer,
 381                                                           attr_list);
 382 #endif
 383       return dri3_create_image_khr_pixmap(disp, ctx, buffer, attr_list);
 384    default:
 385       return dri2_create_image_khr(disp, ctx, target, buffer, attr_list);
 386    }
 387 }
 388
 389 /**
 390  * Called by the driver when it needs to update the real front buffer with the
 391  * contents of its fake front buffer.
 392  */
 393 static void
 394 dri3_flush_front_buffer(__DRIdrawable *driDrawable, void *loaderPrivate)
 395 {
 396    struct loader_dri3_drawable *draw = loaderPrivate;
 397    (void) driDrawable;
 398
 399    /* There does not seem to be any kind of consensus on whether we should
 400     * support front-buffer rendering or not:
 401     * http://lists.freedesktop.org/archives/mesa-dev/2013-June/040129.html
 402     */
 403    if (!draw->is_pixmap)
 404       _eglLog(_EGL_WARNING, "FIXME: egl/x11 doesn't support front buffer rendering.");
 405 }
 406
 407 const __DRIimageLoaderExtension dri3_image_loader_extension = {
 408    .base = { __DRI_IMAGE_LOADER, 1 },
 409
 410    .getBuffers          = loader_dri3_get_buffers,
 411    .flushFrontBuffer    = dri3_flush_front_buffer,
 412 };
 413
 414 static EGLBoolean
 415 dri3_swap_buffers(_EGLDisplay *disp, _EGLSurface *draw)
 416 {
 417    struct dri3_egl_surface *dri3_surf = dri3_egl_surface(draw);
 418
 419    return loader_dri3_swap_buffers_msc(&dri3_surf->loader_drawable,
 420                                        0, 0, 0, 0,
 421                                        draw->SwapBehavior == EGL_BUFFER_PRESERVED) != -1;
 422 }
 423
 424 static EGLBoolean
 425 dri3_copy_buffers(_EGLDisplay *disp, _EGLSurface *surf, void *native_pixmap_target)
 426 {
 427    struct dri3_egl_surface *dri3_surf = dri3_egl_surface(surf);
 428    xcb_pixmap_t target;
 429
 430    STATIC_ASSERT(sizeof(uintptr_t) == sizeof(native_pixmap_target));
 431    target = (uintptr_t) native_pixmap_target;
 432
 433    loader_dri3_copy_drawable(&dri3_surf->loader_drawable, target,
 434                              dri3_surf->loader_drawable.drawable);
 435
 436    return EGL_TRUE;
 437 }
 438
 439 static int
 440 dri3_query_buffer_age(_EGLDisplay *disp, _EGLSurface *surf)
 441 {
 442    struct dri3_egl_surface *dri3_surf = dri3_egl_surface(surf);
 443
 444    return loader_dri3_query_buffer_age(&dri3_surf->loader_drawable);
 445 }
 446
 447 static EGLBoolean
 448 dri3_query_surface(_EGLDisplay *disp, _EGLSurface *surf,
 449                    EGLint attribute, EGLint *value)
 450 {
 451    struct dri3_egl_surface *dri3_surf = dri3_egl_surface(surf);
 452
 453    switch (attribute) {
 454    case EGL_WIDTH:
 455    case EGL_HEIGHT:
 456       loader_dri3_update_drawable_geometry(&dri3_surf->loader_drawable);
 457       break;
 458    default:
 459       break;
 460    }
 461
 462    return _eglQuerySurface(disp, surf, attribute, value);
 463 }
 464
 465 static __DRIdrawable *
 466 dri3_get_dri_drawable(_EGLSurface *surf)
 467 {
 468    struct dri3_egl_surface *dri3_surf = dri3_egl_surface(surf);
 469
 470    return dri3_surf->loader_drawable.dri_drawable;
 471 }
 472
 473 static void
 474 dri3_close_screen_notify(_EGLDisplay *disp)
 475 {
 476    struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
 477
 478    loader_dri3_close_screen(dri2_dpy->dri_screen);
 479 }
 480
 481 struct dri2_egl_display_vtbl dri3_x11_display_vtbl = {
 482    .authenticate = dri3_authenticate,
 483    .create_window_surface = dri3_create_window_surface,
 484    .create_pixmap_surface = dri3_create_pixmap_surface,
 485    .create_pbuffer_surface = dri3_create_pbuffer_surface,
 486    .destroy_surface = dri3_destroy_surface,
 487    .create_image = dri3_create_image_khr,
 488    .swap_interval = dri3_set_swap_interval,
 489    .swap_buffers = dri3_swap_buffers,
 490    .copy_buffers = dri3_copy_buffers,
 491    .query_buffer_age = dri3_query_buffer_age,
 492    .query_surface = dri3_query_surface,
 493    .get_sync_values = dri3_get_sync_values,
 494    .get_dri_drawable = dri3_get_dri_drawable,
 495    .close_screen_notify = dri3_close_screen_notify,
 496 };
 497
 498 /* Only request versions of these protocols which we actually support. */
 499 #define DRI3_SUPPORTED_MAJOR 1
 500 #define PRESENT_SUPPORTED_MAJOR 1
 501
 502 #ifdef HAVE_DRI3_MODIFIERS
 503 #define DRI3_SUPPORTED_MINOR 2
 504 #define PRESENT_SUPPORTED_MINOR 2
 505 #else
 506 #define PRESENT_SUPPORTED_MINOR 0
 507 #define DRI3_SUPPORTED_MINOR 0
 508 #endif
 509
 510 EGLBoolean
 511 dri3_x11_connect(struct dri2_egl_display *dri2_dpy)
 512 {
 513    xcb_dri3_query_version_reply_t *dri3_query;
 514    xcb_dri3_query_version_cookie_t dri3_query_cookie;
 515    xcb_present_query_version_reply_t *present_query;
 516    xcb_present_query_version_cookie_t present_query_cookie;
 517    xcb_generic_error_t *error;
 518    const xcb_query_extension_reply_t *extension;
 519
 520    xcb_prefetch_extension_data (dri2_dpy->conn, &xcb_dri3_id);
 521    xcb_prefetch_extension_data (dri2_dpy->conn, &xcb_present_id);
 522
 523    extension = xcb_get_extension_data(dri2_dpy->conn, &xcb_dri3_id);
 524    if (!(extension && extension->present))
 525       return EGL_FALSE;
 526
 527    extension = xcb_get_extension_data(dri2_dpy->conn, &xcb_present_id);
 528    if (!(extension && extension->present))
 529       return EGL_FALSE;
 530
 531    dri3_query_cookie = xcb_dri3_query_version(dri2_dpy->conn,
 532                                               DRI3_SUPPORTED_MAJOR,
 533                                               DRI3_SUPPORTED_MINOR);
 534
 535    present_query_cookie = xcb_present_query_version(dri2_dpy->conn,
 536                                                     PRESENT_SUPPORTED_MAJOR,
 537                                                     PRESENT_SUPPORTED_MINOR);
 538
 539    dri3_query =
 540       xcb_dri3_query_version_reply(dri2_dpy->conn, dri3_query_cookie, &error);
 541    if (dri3_query == NULL || error != NULL) {
 542       _eglLog(_EGL_WARNING, "DRI3: failed to query the version");
 543       free(dri3_query);
 544       free(error);
 545       return EGL_FALSE;
 546    }
 547
 548    dri2_dpy->dri3_major_version = dri3_query->major_version;
 549    dri2_dpy->dri3_minor_version = dri3_query->minor_version;
 550    free(dri3_query);
 551
 552    present_query =
 553       xcb_present_query_version_reply(dri2_dpy->conn,
 554                                       present_query_cookie, &error);
 555    if (present_query == NULL || error != NULL) {
 556       _eglLog(_EGL_WARNING, "DRI3: failed to query Present version");
 557       free(present_query);
 558       free(error);
 559       return EGL_FALSE;
 560    }
 561
 562    dri2_dpy->present_major_version = present_query->major_version;
 563    dri2_dpy->present_minor_version = present_query->minor_version;
 564    free(present_query);
 565
 566    dri2_dpy->fd = loader_dri3_open(dri2_dpy->conn, dri2_dpy->screen->root, 0);
 567    if (dri2_dpy->fd < 0) {
 568       int conn_error = xcb_connection_has_error(dri2_dpy->conn);
 569       _eglLog(_EGL_WARNING, "DRI3: Screen seems not DRI3 capable");
 570
 571       if (conn_error)
 572          _eglLog(_EGL_WARNING, "DRI3: Failed to initialize");
 573
 574       return EGL_FALSE;
 575    }
 576
 577    dri2_dpy->fd = loader_get_user_preferred_fd(dri2_dpy->fd, &dri2_dpy->is_different_gpu);
 578
 579    dri2_dpy->driver_name = loader_get_driver_for_fd(dri2_dpy->fd);
 580    if (!dri2_dpy->driver_name) {
 581       _eglLog(_EGL_WARNING, "DRI3: No driver found");
 582       close(dri2_dpy->fd);
 583       return EGL_FALSE;
 584    }
 585
 586 #ifdef HAVE_WAYLAND_PLATFORM
 587    /* Only try to get a render device name since dri3 doesn't provide a
 588     * mechanism for authenticating client opened device node fds. If this
 589     * fails then don't advertise the extension. */
 590    dri2_dpy->device_name = drmGetRenderDeviceNameFromFd(dri2_dpy->fd);
 591 #endif
 592
 593    return EGL_TRUE;
 594 }