summaryrefslogtreecommitdiff
path: root/src/egl/drivers/dri2/platform_drm.c
blob: 20993147c8a272d535fbb114c344b23200fe1a82 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
/*
 * Copyright © 2011 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Kristian Høgsberg <krh@bitplanet.net>
 */

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <xf86drm.h>
#include <dlfcn.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>

#include "egl_dri2.h"
#include "egl_dri2_fallbacks.h"
#include "loader.h"

static struct gbm_bo *
lock_front_buffer(struct gbm_surface *_surf)
{
   struct gbm_dri_surface *surf = (struct gbm_dri_surface *) _surf;
   struct dri2_egl_surface *dri2_surf = surf->dri_private;
   struct gbm_dri_device *device = (struct gbm_dri_device *) _surf->gbm;
   struct gbm_bo *bo;

   if (dri2_surf->current == NULL) {
      _eglError(EGL_BAD_SURFACE, "no front buffer");
      return NULL;
   }

   bo = dri2_surf->current->bo;

   if (device->dri2) {
      dri2_surf->current->locked = 1;
      dri2_surf->current = NULL;
   }

   return bo;
}

static void
release_buffer(struct gbm_surface *_surf, struct gbm_bo *bo)
{
   struct gbm_dri_surface *surf = (struct gbm_dri_surface *) _surf;
   struct dri2_egl_surface *dri2_surf = surf->dri_private;
   unsigned i;

   for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++) {
      if (dri2_surf->color_buffers[i].bo == bo) {
	 dri2_surf->color_buffers[i].locked = 0;
      }
   }
}

static int
has_free_buffers(struct gbm_surface *_surf)
{
   struct gbm_dri_surface *surf = (struct gbm_dri_surface *) _surf;
   struct dri2_egl_surface *dri2_surf = surf->dri_private;
   unsigned i;

   for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++)
      if (!dri2_surf->color_buffers[i].locked)
	 return 1;

   return 0;
}

static _EGLSurface *
dri2_drm_create_surface(_EGLDriver *drv, _EGLDisplay *disp, EGLint type,
                        _EGLConfig *conf, void *native_window,
                        const EGLint *attrib_list)
{
   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
   struct dri2_egl_config *dri2_conf = dri2_egl_config(conf);
   struct dri2_egl_surface *dri2_surf;
   struct gbm_surface *window = native_window;
   struct gbm_dri_surface *surf;
   const __DRIconfig *config;

   (void) drv;

   dri2_surf = calloc(1, sizeof *dri2_surf);
   if (!dri2_surf) {
      _eglError(EGL_BAD_ALLOC, "dri2_create_surface");
      return NULL;
   }

   if (!_eglInitSurface(&dri2_surf->base, disp, type, conf, attrib_list))
      goto cleanup_surf;

   switch (type) {
   case EGL_WINDOW_BIT:
      if (!window) {
         _eglError(EGL_BAD_NATIVE_WINDOW, "dri2_create_surface");
         goto cleanup_surf;
      }

      surf = gbm_dri_surface(window);
      dri2_surf->gbm_surf = surf;
      dri2_surf->base.Width =  surf->base.width;
      dri2_surf->base.Height = surf->base.height;
      surf->dri_private = dri2_surf;
      break;
   default:
      goto cleanup_surf;
   }

   config = dri2_get_dri_config(dri2_conf, EGL_WINDOW_BIT,
                                dri2_surf->base.GLColorspace);

   if (dri2_dpy->dri2) {
      dri2_surf->dri_drawable =
         (*dri2_dpy->dri2->createNewDrawable)(dri2_dpy->dri_screen, config,
                                              dri2_surf->gbm_surf);

   } else {
      assert(dri2_dpy->swrast != NULL);

      dri2_surf->dri_drawable =
         (*dri2_dpy->swrast->createNewDrawable)(dri2_dpy->dri_screen, config,
                                                dri2_surf->gbm_surf);

   }
   if (dri2_surf->dri_drawable == NULL) {
      _eglError(EGL_BAD_ALLOC, "createNewDrawable()");
      goto cleanup_surf;
   }

   return &dri2_surf->base;

 cleanup_surf:
   free(dri2_surf);

   return NULL;
}

static _EGLSurface *
dri2_drm_create_window_surface(_EGLDriver *drv, _EGLDisplay *disp,
                               _EGLConfig *conf, void *native_window,
                               const EGLint *attrib_list)
{
   return dri2_drm_create_surface(drv, disp, EGL_WINDOW_BIT, conf,
                                  native_window, attrib_list);
}

static _EGLSurface *
dri2_drm_create_pixmap_surface(_EGLDriver *drv, _EGLDisplay *disp,
                               _EGLConfig *conf, void *native_window,
                               const EGLint *attrib_list)
{
   /* From the EGL_MESA_platform_gbm spec, version 5:
    *
    *  It is not valid to call eglCreatePlatformPixmapSurfaceEXT with a <dpy>
    *  that belongs to the GBM platform. Any such call fails and generates
    *  EGL_BAD_PARAMETER.
    */
   _eglError(EGL_BAD_PARAMETER, "cannot create EGL pixmap surfaces on GBM");
   return NULL;
}

static EGLBoolean
dri2_drm_destroy_surface(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *surf)
{
   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
   struct dri2_egl_surface *dri2_surf = dri2_egl_surface(surf);
   unsigned i;

   (*dri2_dpy->core->destroyDrawable)(dri2_surf->dri_drawable);

   for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++) {
      if (dri2_surf->color_buffers[i].bo)
	 gbm_bo_destroy(dri2_surf->color_buffers[i].bo);
   }

   for (i = 0; i < __DRI_BUFFER_COUNT; i++) {
      if (dri2_surf->dri_buffers[i])
         dri2_dpy->dri2->releaseBuffer(dri2_dpy->dri_screen,
                                       dri2_surf->dri_buffers[i]);
   }

   free(surf);

   return EGL_TRUE;
}

static int
get_back_bo(struct dri2_egl_surface *dri2_surf)
{
   struct dri2_egl_display *dri2_dpy =
      dri2_egl_display(dri2_surf->base.Resource.Display);
   struct gbm_dri_surface *surf = dri2_surf->gbm_surf;
   unsigned i;

   if (dri2_surf->back == NULL) {
      for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++) {
	 if (!dri2_surf->color_buffers[i].locked) {
	    dri2_surf->back = &dri2_surf->color_buffers[i];
	    break;
	 }
      }
   }

   if (dri2_surf->back == NULL)
      return -1;
   if (dri2_surf->back->bo == NULL)
      dri2_surf->back->bo = gbm_bo_create(&dri2_dpy->gbm_dri->base.base,
					  surf->base.width, surf->base.height,
					  surf->base.format, surf->base.flags);
   if (dri2_surf->back->bo == NULL)
      return -1;

   return 0;
}

static int
get_swrast_front_bo(struct dri2_egl_surface *dri2_surf)
{
   struct dri2_egl_display *dri2_dpy =
      dri2_egl_display(dri2_surf->base.Resource.Display);
   struct gbm_dri_surface *surf = dri2_surf->gbm_surf;

   if (dri2_surf->current == NULL) {
      assert(!dri2_surf->color_buffers[0].locked);
      dri2_surf->current = &dri2_surf->color_buffers[0];
   }

   if (dri2_surf->current->bo == NULL)
      dri2_surf->current->bo = gbm_bo_create(&dri2_dpy->gbm_dri->base.base,
                                             surf->base.width, surf->base.height,
                                             surf->base.format, surf->base.flags);
   if (dri2_surf->current->bo == NULL)
      return -1;

   return 0;
}

static void
back_bo_to_dri_buffer(struct dri2_egl_surface *dri2_surf, __DRIbuffer *buffer)
{
   struct dri2_egl_display *dri2_dpy =
      dri2_egl_display(dri2_surf->base.Resource.Display);
   struct gbm_dri_bo *bo;
   int name, pitch;

   bo = (struct gbm_dri_bo *) dri2_surf->back->bo;

   dri2_dpy->image->queryImage(bo->image, __DRI_IMAGE_ATTRIB_NAME, &name);
   dri2_dpy->image->queryImage(bo->image, __DRI_IMAGE_ATTRIB_STRIDE, &pitch);

   buffer->attachment = __DRI_BUFFER_BACK_LEFT;
   buffer->name = name;
   buffer->pitch = pitch;
   buffer->cpp = 4;
   buffer->flags = 0;
}

static int
get_aux_bo(struct dri2_egl_surface *dri2_surf,
	   unsigned int attachment, unsigned int format, __DRIbuffer *buffer)
{
   struct dri2_egl_display *dri2_dpy =
      dri2_egl_display(dri2_surf->base.Resource.Display);
   __DRIbuffer *b = dri2_surf->dri_buffers[attachment];

   if (b == NULL) {
      b = dri2_dpy->dri2->allocateBuffer(dri2_dpy->dri_screen,
					 attachment, format,
					 dri2_surf->base.Width,
					 dri2_surf->base.Height);
      dri2_surf->dri_buffers[attachment] = b;
   }
   if (b == NULL)
      return -1;

   memcpy(buffer, b, sizeof *buffer);

   return 0;
}

static __DRIbuffer *
dri2_drm_get_buffers_with_format(__DRIdrawable *driDrawable,
			     int *width, int *height,
			     unsigned int *attachments, int count,
			     int *out_count, void *loaderPrivate)
{
   struct dri2_egl_surface *dri2_surf = loaderPrivate;
   int i, j;

   dri2_surf->buffer_count = 0;
   for (i = 0, j = 0; i < 2 * count; i += 2, j++) {
      assert(attachments[i] < __DRI_BUFFER_COUNT);
      assert(dri2_surf->buffer_count < 5);

      switch (attachments[i]) {
      case __DRI_BUFFER_BACK_LEFT:
	 if (get_back_bo(dri2_surf) < 0) {
	    _eglError(EGL_BAD_ALLOC, "failed to allocate color buffer");
	    return NULL;
	 }
         back_bo_to_dri_buffer(dri2_surf, &dri2_surf->buffers[j]);
	 break;
      default:
	 if (get_aux_bo(dri2_surf, attachments[i], attachments[i + 1],
			&dri2_surf->buffers[j]) < 0) {
	    _eglError(EGL_BAD_ALLOC, "failed to allocate aux buffer");
	    return NULL;
	 }
	 break;
      }
   }

   *out_count = j;
   if (j == 0)
      return NULL;

   *width = dri2_surf->base.Width;
   *height = dri2_surf->base.Height;

   return dri2_surf->buffers;
}

static __DRIbuffer *
dri2_drm_get_buffers(__DRIdrawable * driDrawable,
                     int *width, int *height,
                     unsigned int *attachments, int count,
                     int *out_count, void *loaderPrivate)
{
   unsigned int *attachments_with_format;
   __DRIbuffer *buffer;
   const unsigned int format = 32;
   int i;

   attachments_with_format = calloc(count, 2 * sizeof(unsigned int));
   if (!attachments_with_format) {
      *out_count = 0;
      return NULL;
   }

   for (i = 0; i < count; ++i) {
      attachments_with_format[2*i] = attachments[i];
      attachments_with_format[2*i + 1] = format;
   }

   buffer =
      dri2_drm_get_buffers_with_format(driDrawable,
                                       width, height,
                                       attachments_with_format, count,
                                       out_count, loaderPrivate);

   free(attachments_with_format);

   return buffer;
}

static int
dri2_drm_image_get_buffers(__DRIdrawable *driDrawable,
                           unsigned int format,
                           uint32_t *stamp,
                           void *loaderPrivate,
                           uint32_t buffer_mask,
                           struct __DRIimageList *buffers)
{
   struct dri2_egl_surface *dri2_surf = loaderPrivate;
   struct gbm_dri_bo *bo;

   if (get_back_bo(dri2_surf) < 0)
      return 0;

   bo = (struct gbm_dri_bo *) dri2_surf->back->bo;
   buffers->image_mask = __DRI_IMAGE_BUFFER_BACK;
   buffers->back = bo->image;

   return 1;
}

static void
dri2_drm_flush_front_buffer(__DRIdrawable * driDrawable, void *loaderPrivate)
{
   (void) driDrawable;
   (void) loaderPrivate;
}

static EGLBoolean
dri2_drm_swap_buffers(_EGLDriver *drv, _EGLDisplay *disp, _EGLSurface *draw)
{
   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
   struct dri2_egl_surface *dri2_surf = dri2_egl_surface(draw);
   unsigned i;

   if (dri2_dpy->swrast) {
      (*dri2_dpy->core->swapBuffers)(dri2_surf->dri_drawable);
   } else {
      if (dri2_surf->base.Type == EGL_WINDOW_BIT) {
         if (dri2_surf->current)
            _eglError(EGL_BAD_SURFACE, "dri2_swap_buffers");
         for (i = 0; i < ARRAY_SIZE(dri2_surf->color_buffers); i++)
            if (dri2_surf->color_buffers[i].age > 0)
               dri2_surf->color_buffers[i].age++;

         /* Make sure we have a back buffer in case we're swapping without
          * ever rendering. */
         if (get_back_bo(dri2_surf) < 0) {
            _eglError(EGL_BAD_ALLOC, "dri2_swap_buffers");
            return EGL_FALSE;
         }

         dri2_surf->current = dri2_surf->back;
         dri2_surf->current->age = 1;
         dri2_surf->back = NULL;
      }

      dri2_flush_drawable_for_swapbuffers(disp, draw);
      (*dri2_dpy->flush->invalidate)(dri2_surf->dri_drawable);
   }

   return EGL_TRUE;
}

static EGLint
dri2_drm_query_buffer_age(_EGLDriver *drv,
                          _EGLDisplay *disp, _EGLSurface *surface)
{
   struct dri2_egl_surface *dri2_surf = dri2_egl_surface(surface);

   if (get_back_bo(dri2_surf) < 0) {
      _eglError(EGL_BAD_ALLOC, "dri2_query_buffer_age");
      return 0;
   }

   return dri2_surf->back->age;
}

static _EGLImage *
dri2_drm_create_image_khr_pixmap(_EGLDisplay *disp, _EGLContext *ctx,
                                 EGLClientBuffer buffer, const EGLint *attr_list)
{
   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
   struct gbm_dri_bo *dri_bo = gbm_dri_bo((struct gbm_bo *) buffer);
   struct dri2_egl_image *dri2_img;

   dri2_img = malloc(sizeof *dri2_img);
   if (!dri2_img) {
      _eglError(EGL_BAD_ALLOC, "dri2_create_image_khr_pixmap");
      return NULL;
   }

   if (!_eglInitImage(&dri2_img->base, disp)) {
      free(dri2_img);
      return NULL;
   }

   dri2_img->dri_image = dri2_dpy->image->dupImage(dri_bo->image, dri2_img);
   if (dri2_img->dri_image == NULL) {
      free(dri2_img);
      _eglError(EGL_BAD_ALLOC, "dri2_create_image_khr_pixmap");
      return NULL;
   }

   return &dri2_img->base;
}

static _EGLImage *
dri2_drm_create_image_khr(_EGLDriver *drv, _EGLDisplay *disp,
                          _EGLContext *ctx, EGLenum target,
                          EGLClientBuffer buffer, const EGLint *attr_list)
{
   (void) drv;

   switch (target) {
   case EGL_NATIVE_PIXMAP_KHR:
      return dri2_drm_create_image_khr_pixmap(disp, ctx, buffer, attr_list);
   default:
      return dri2_create_image_khr(drv, disp, ctx, target, buffer, attr_list);
   }
}

static int
dri2_drm_authenticate(_EGLDisplay *disp, uint32_t id)
{
   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);

   return drmAuthMagic(dri2_dpy->fd, id);
}

static void
swrast_put_image2(__DRIdrawable *driDrawable,
                  int            op,
                  int            x,
                  int            y,
                  int            width,
                  int            height,
                  int            stride,
                  char          *data,
                  void          *loaderPrivate)
{
   struct dri2_egl_surface *dri2_surf = loaderPrivate;
   int internal_stride, i;
   struct gbm_dri_bo *bo;

   if (op != __DRI_SWRAST_IMAGE_OP_DRAW &&
       op != __DRI_SWRAST_IMAGE_OP_SWAP)
      return;

   if (get_swrast_front_bo(dri2_surf) < 0)
      return;

   bo = gbm_dri_bo(dri2_surf->current->bo);
   if (gbm_dri_bo_map_dumb(bo) == NULL)
      return;

   internal_stride = bo->base.base.stride;

   for (i = 0; i < height; i++) {
      memcpy(bo->map + (x + i) * internal_stride + y,
             data + i * stride, stride);
   }

   gbm_dri_bo_unmap_dumb(bo);
}

static void
swrast_get_image(__DRIdrawable *driDrawable,
                 int            x,
                 int            y,
                 int            width,
                 int            height,
                 char          *data,
                 void          *loaderPrivate)
{
   struct dri2_egl_surface *dri2_surf = loaderPrivate;
   int internal_stride, stride, i;
   struct gbm_dri_bo *bo;

   if (get_swrast_front_bo(dri2_surf) < 0)
      return;

   bo = gbm_dri_bo(dri2_surf->current->bo);
   if (gbm_dri_bo_map_dumb(bo) == NULL)
      return;

   internal_stride = bo->base.base.stride;
   stride = width * 4;

   for (i = 0; i < height; i++) {
      memcpy(data + i * stride,
             bo->map + (x + i) * internal_stride + y, stride);
   }

   gbm_dri_bo_unmap_dumb(bo);
}

static EGLBoolean
drm_add_configs_for_visuals(_EGLDriver *drv, _EGLDisplay *disp)
{
   struct dri2_egl_display *dri2_dpy = dri2_egl_display(disp);
   static const struct {
      int format;
      unsigned int red_mask;
      unsigned int alpha_mask;
   } visuals[] = {
      { GBM_FORMAT_XRGB2101010, 0x3ff00000, 0x00000000 },
      { GBM_FORMAT_ARGB2101010, 0x3ff00000, 0xc0000000 },
      { GBM_FORMAT_XRGB8888,    0x00ff0000, 0x00000000 },
      { GBM_FORMAT_ARGB8888,    0x00ff0000, 0xff000000 },
      { GBM_FORMAT_RGB565,      0x0000f800, 0x00000000 },
   };
   EGLint attr_list[] = {
      EGL_NATIVE_VISUAL_ID, 0,
      EGL_NONE,
   };
   unsigned int format_count[ARRAY_SIZE(visuals)] = { 0 };
   unsigned int count, i, j;

   count = 0;
   for (i = 0; dri2_dpy->driver_configs[i]; i++) {
      unsigned int red, alpha;

      dri2_dpy->core->getConfigAttrib(dri2_dpy->driver_configs[i],
                                      __DRI_ATTRIB_RED_MASK, &red);
      dri2_dpy->core->getConfigAttrib(dri2_dpy->driver_configs[i],
                                      __DRI_ATTRIB_ALPHA_MASK, &alpha);

      for (j = 0; j < ARRAY_SIZE(visuals); j++) {
         struct dri2_egl_config *dri2_conf;

         if (visuals[j].red_mask != red || visuals[j].alpha_mask != alpha)
            continue;

         attr_list[1] = visuals[j].format;

         dri2_conf = dri2_add_config(disp, dri2_dpy->driver_configs[i],
               count + 1, EGL_WINDOW_BIT, attr_list, NULL);
         if (dri2_conf) {
            count++;
            format_count[j]++;
         }
      }
   }

   for (i = 0; i < ARRAY_SIZE(format_count); i++) {
      if (!format_count[i]) {
         _eglLog(_EGL_DEBUG, "No DRI config supports native format 0x%x",
                 visuals[i].format);
      }
   }

   return (count != 0);
}

static struct dri2_egl_display_vtbl dri2_drm_display_vtbl = {
   .authenticate = dri2_drm_authenticate,
   .create_window_surface = dri2_drm_create_window_surface,
   .create_pixmap_surface = dri2_drm_create_pixmap_surface,
   .create_pbuffer_surface = dri2_fallback_create_pbuffer_surface,
   .destroy_surface = dri2_drm_destroy_surface,
   .create_image = dri2_drm_create_image_khr,
   .swap_interval = dri2_fallback_swap_interval,
   .swap_buffers = dri2_drm_swap_buffers,
   .swap_buffers_with_damage = dri2_fallback_swap_buffers_with_damage,
   .swap_buffers_region = dri2_fallback_swap_buffers_region,
   .post_sub_buffer = dri2_fallback_post_sub_buffer,
   .copy_buffers = dri2_fallback_copy_buffers,
   .query_buffer_age = dri2_drm_query_buffer_age,
   .create_wayland_buffer_from_image = dri2_fallback_create_wayland_buffer_from_image,
   .get_sync_values = dri2_fallback_get_sync_values,
   .get_dri_drawable = dri2_surface_get_dri_drawable,
};

EGLBoolean
dri2_initialize_drm(_EGLDriver *drv, _EGLDisplay *disp)
{
   struct dri2_egl_display *dri2_dpy;
   struct gbm_device *gbm;
   const char *err;
   int fd = -1;

   loader_set_logger(_eglLog);

   dri2_dpy = calloc(1, sizeof *dri2_dpy);
   if (!dri2_dpy)
      return _eglError(EGL_BAD_ALLOC, "eglInitialize");

   disp->DriverData = (void *) dri2_dpy;

   gbm = disp->PlatformDisplay;
   if (gbm == NULL) {
      char buf[64];
      int n = snprintf(buf, sizeof(buf), DRM_DEV_NAME, DRM_DIR_NAME, 0);
      if (n != -1 && n < sizeof(buf))
         fd = loader_open_device(buf);
      if (fd < 0)
         fd = loader_open_device("/dev/dri/card0");
      dri2_dpy->own_device = 1;
      gbm = gbm_create_device(fd);
      if (gbm == NULL) {
         err = "DRI2: failed to create gbm device";
         goto cleanup;
      }
   } else {
      fd = fcntl(gbm_device_get_fd(gbm), F_DUPFD_CLOEXEC, 3);
      if (fd < 0) {
         err = "DRI2: failed to fcntl() existing gbm device";
         goto cleanup;
      }
   }

   if (strcmp(gbm_device_get_backend_name(gbm), "drm") != 0) {
      err = "DRI2: gbm device using incorrect/incompatible backend";
      goto cleanup;
   }

   dri2_dpy->gbm_dri = gbm_dri_device(gbm);
   if (dri2_dpy->gbm_dri->base.type != GBM_DRM_DRIVER_TYPE_DRI) {
      err = "DRI2: gbm device using incorrect/incompatible type";
      goto cleanup;
   }

   dri2_dpy->fd = fd;
   dri2_dpy->driver_name = strdup(dri2_dpy->gbm_dri->base.driver_name);

   dri2_dpy->dri_screen = dri2_dpy->gbm_dri->screen;
   dri2_dpy->core = dri2_dpy->gbm_dri->core;
   dri2_dpy->dri2 = dri2_dpy->gbm_dri->dri2;
   dri2_dpy->fence = dri2_dpy->gbm_dri->fence;
   dri2_dpy->image = dri2_dpy->gbm_dri->image;
   dri2_dpy->flush = dri2_dpy->gbm_dri->flush;
   dri2_dpy->swrast = dri2_dpy->gbm_dri->swrast;
   dri2_dpy->driver_configs = dri2_dpy->gbm_dri->driver_configs;
   dri2_dpy->interop = dri2_dpy->gbm_dri->interop;

   dri2_dpy->gbm_dri->lookup_image = dri2_lookup_egl_image;
   dri2_dpy->gbm_dri->lookup_user_data = disp;

   dri2_dpy->gbm_dri->get_buffers = dri2_drm_get_buffers;
   dri2_dpy->gbm_dri->flush_front_buffer = dri2_drm_flush_front_buffer;
   dri2_dpy->gbm_dri->get_buffers_with_format = dri2_drm_get_buffers_with_format;
   dri2_dpy->gbm_dri->image_get_buffers = dri2_drm_image_get_buffers;
   dri2_dpy->gbm_dri->swrast_put_image2 = swrast_put_image2;
   dri2_dpy->gbm_dri->swrast_get_image = swrast_get_image;

   dri2_dpy->gbm_dri->base.base.surface_lock_front_buffer = lock_front_buffer;
   dri2_dpy->gbm_dri->base.base.surface_release_buffer = release_buffer;
   dri2_dpy->gbm_dri->base.base.surface_has_free_buffers = has_free_buffers;

   dri2_setup_screen(disp);

   if (!drm_add_configs_for_visuals(drv, disp)) {
      err = "DRI2: failed to add configs";
      goto cleanup;
   }

   disp->Extensions.KHR_image_pixmap = EGL_TRUE;
   if (dri2_dpy->dri2)
      disp->Extensions.EXT_buffer_age = EGL_TRUE;

#ifdef HAVE_WAYLAND_PLATFORM
   dri2_dpy->device_name = loader_get_device_name_for_fd(dri2_dpy->fd);
#endif
   dri2_set_WL_bind_wayland_display(drv, disp);

   /* Fill vtbl last to prevent accidentally calling virtual function during
    * initialization.
    */
   dri2_dpy->vtbl = &dri2_drm_display_vtbl;

   return EGL_TRUE;

cleanup:
   if (fd >= 0)
      close(fd);

   free(dri2_dpy);
   disp->DriverData = NULL;
   return _eglError(EGL_NOT_INITIALIZED, err);
}