aboutsummaryrefslogtreecommitdiff
path: root/backend/drm/drm.c
blob: e3f2bfe1aa09c68893d40faf925fce23ba9a18e1 (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
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <inttypes.h>
#include <errno.h>
#include <time.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include <drm_mode.h>
#include <EGL/egl.h>
#include <EGL/eglext.h>
#include <gbm.h>
#include <GLES2/gl2.h>
#include <GLES2/gl2ext.h>
#include <wayland-server.h>
#include <wlr/backend/interface.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/util/log.h>
#include <wlr/render/matrix.h>
#include <wlr/render/gles2.h>
#include <wlr/render.h>
#include "backend/drm/drm.h"
#include "backend/drm/iface.h"
#include "backend/drm/util.h"

bool wlr_drm_check_features(struct wlr_drm_backend *drm) {
	if (drmSetClientCap(drm->fd, DRM_CLIENT_CAP_UNIVERSAL_PLANES, 1)) {
		wlr_log(L_ERROR, "DRM universal planes unsupported");
		return false;
	}

	if (getenv("WLR_DRM_NO_ATOMIC")) {
		wlr_log(L_DEBUG, "WLR_DRM_NO_ATOMIC set, forcing legacy DRM interface");
		drm->iface = &legacy_iface;
	} else if (drmSetClientCap(drm->fd, DRM_CLIENT_CAP_ATOMIC, 1)) {
		wlr_log(L_DEBUG, "Atomic modesetting unsupported, using legacy DRM interface");
		drm->iface = &legacy_iface;
	} else {
		wlr_log(L_DEBUG, "Using atomic DRM interface");
		drm->iface = &atomic_iface;
	}

	return true;
}

static int cmp_plane(const void *arg1, const void *arg2) {
	const struct wlr_drm_plane *a = arg1;
	const struct wlr_drm_plane *b = arg2;

	return (int)a->type - (int)b->type;
}

static bool init_planes(struct wlr_drm_backend *drm) {
	drmModePlaneRes *plane_res = drmModeGetPlaneResources(drm->fd);
	if (!plane_res) {
		wlr_log_errno(L_ERROR, "Failed to get DRM plane resources");
		return false;
	}

	wlr_log(L_INFO, "Found %"PRIu32" DRM planes", plane_res->count_planes);

	if (plane_res->count_planes == 0) {
		drmModeFreePlaneResources(plane_res);
		return true;
	}

	drm->num_planes = plane_res->count_planes;
	drm->planes = calloc(drm->num_planes, sizeof(*drm->planes));
	if (!drm->planes) {
		wlr_log_errno(L_ERROR, "Allocation failed");
		goto error_res;
	}

	for (size_t i = 0; i < drm->num_planes; ++i) {
		struct wlr_drm_plane *p = &drm->planes[i];

		drmModePlane *plane = drmModeGetPlane(drm->fd, plane_res->planes[i]);
		if (!plane) {
			wlr_log_errno(L_ERROR, "Failed to get DRM plane");
			goto error_planes;
		}

		p->id = plane->plane_id;
		p->possible_crtcs = plane->possible_crtcs;
		uint64_t type;

		if (!wlr_drm_get_plane_props(drm->fd, p->id, &p->props) ||
				!wlr_drm_get_prop(drm->fd, p->id, p->props.type, &type)) {
			drmModeFreePlane(plane);
			goto error_planes;
		}

		p->type = type;
		drm->num_type_planes[type]++;

		drmModeFreePlane(plane);
	}

	wlr_log(L_INFO, "(%zu overlay, %zu primary, %zu cursor)",
		drm->num_overlay_planes,
		drm->num_primary_planes,
		drm->num_cursor_planes);

	qsort(drm->planes, drm->num_planes, sizeof(*drm->planes), cmp_plane);

	drm->overlay_planes = drm->planes;
	drm->primary_planes = drm->overlay_planes
		+ drm->num_overlay_planes;
	drm->cursor_planes = drm->primary_planes
		+ drm->num_primary_planes;

	drmModeFreePlaneResources(plane_res);
	return true;

error_planes:
	free(drm->planes);
error_res:
	drmModeFreePlaneResources(plane_res);
	return false;
}

bool wlr_drm_resources_init(struct wlr_drm_backend *drm) {
	drmModeRes *res = drmModeGetResources(drm->fd);
	if (!res) {
		wlr_log_errno(L_ERROR, "Failed to get DRM resources");
		return false;
	}

	wlr_log(L_INFO, "Found %d DRM CRTCs", res->count_crtcs);

	drm->num_crtcs = res->count_crtcs;
	drm->crtcs = calloc(drm->num_crtcs, sizeof(drm->crtcs[0]));
	if (!drm->crtcs) {
		wlr_log_errno(L_ERROR, "Allocation failed");
		goto error_res;
	}

	for (size_t i = 0; i < drm->num_crtcs; ++i) {
		struct wlr_drm_crtc *crtc = &drm->crtcs[i];
		crtc->id = res->crtcs[i];
		wlr_drm_get_crtc_props(drm->fd, crtc->id, &crtc->props);
	}

	if (!init_planes(drm)) {
		goto error_crtcs;
	}

	drmModeFreeResources(res);

	return true;

error_crtcs:
	free(drm->crtcs);
error_res:
	drmModeFreeResources(res);
	return false;
}

void wlr_drm_resources_free(struct wlr_drm_backend *drm) {
	if (!drm) {
		return;
	}

	for (size_t i = 0; i < drm->num_crtcs; ++i) {
		struct wlr_drm_crtc *crtc = &drm->crtcs[i];
		drmModeAtomicFree(crtc->atomic);
		if (crtc->mode_id) {
			drmModeDestroyPropertyBlob(drm->fd, crtc->mode_id);
		}
	}
	for (size_t i = 0; i < drm->num_planes; ++i) {
		struct wlr_drm_plane *plane = &drm->planes[i];
		if (plane->cursor_bo) {
			gbm_bo_destroy(plane->cursor_bo);
		}
		if (plane->wlr_tex) {
			wlr_texture_destroy(plane->wlr_tex);
		}
	}

	free(drm->crtcs);
	free(drm->planes);
}

static void wlr_drm_connector_make_current(struct wlr_output *output) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	wlr_drm_surface_make_current(&conn->crtc->primary->surf);
}

static void wlr_drm_connector_swap_buffers(struct wlr_output *output) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;

	struct wlr_drm_crtc *crtc = conn->crtc;
	struct wlr_drm_plane *plane = crtc->primary;

	struct gbm_bo *bo = wlr_drm_surface_swap_buffers(&plane->surf);
	if (drm->parent) {
		bo = wlr_drm_surface_mgpu_copy(&plane->mgpu_surf, bo);
	}

	uint32_t fb_id = get_fb_for_bo(bo);

	if (drm->iface->crtc_pageflip(drm, conn, crtc, fb_id, NULL)) {
		conn->pageflip_pending = true;
	} else {
		wl_event_source_timer_update(conn->retry_pageflip,
			1000.0f / conn->output.current_mode->refresh);
	}
}

static void wlr_drm_connector_set_gamma(struct wlr_output *output,
		uint32_t size, uint16_t *r, uint16_t *g, uint16_t *b) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
	drmModeCrtcSetGamma(drm->fd, conn->crtc->id, size, r, g, b);
}

static uint32_t wlr_drm_connector_get_gamma_size(struct wlr_output *output) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	drmModeCrtc *crtc = conn->old_crtc;
	return crtc ? crtc->gamma_size : 0;
}

void wlr_drm_connector_start_renderer(struct wlr_drm_connector *conn) {
	if (conn->state != WLR_DRM_CONN_CONNECTED) {
		return;
	}

	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)conn->output.backend;
	struct wlr_drm_crtc *crtc = conn->crtc;
	struct wlr_drm_plane *plane = crtc->primary;

	struct gbm_bo *bo = wlr_drm_surface_get_front(
		drm->parent ? &plane->mgpu_surf : &plane->surf);
	uint32_t fb_id = get_fb_for_bo(bo);

	struct wlr_drm_mode *mode = (struct wlr_drm_mode *)conn->output.current_mode;
	if (drm->iface->crtc_pageflip(drm, conn, crtc, fb_id, &mode->drm_mode)) {
		conn->pageflip_pending = true;
	} else {
		wl_event_source_timer_update(conn->retry_pageflip,
			1000.0f / conn->output.current_mode->refresh);
	}
}

static void wlr_drm_connector_enable(struct wlr_output *output, bool enable) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	if (conn->state != WLR_DRM_CONN_CONNECTED) {
		return;
	}

	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
	drm->iface->conn_enable(drm, conn, enable);

	if (enable) {
		wlr_drm_connector_start_renderer(conn);
	}
}

static void realloc_planes(struct wlr_drm_backend *drm, const uint32_t *crtc_in,
		bool *changed_outputs) {
	// overlay, primary, cursor
	for (int type = 0; type < 3; ++type) {
		if (drm->num_type_planes[type] == 0) {
			continue;
		}

		uint32_t possible[drm->num_type_planes[type]];
		uint32_t crtc[drm->num_crtcs];
		uint32_t crtc_res[drm->num_crtcs];

		for (size_t i = 0; i < drm->num_type_planes[type]; ++i) {
			possible[i] = drm->type_planes[type][i].possible_crtcs;
		}

		for (size_t i = 0; i < drm->num_crtcs; ++i) {
			if (crtc_in[i] == UNMATCHED) {
				crtc[i] = SKIP;
			} else if (drm->crtcs[i].planes[type]) {
				crtc[i] = drm->crtcs[i].planes[type]
					- drm->type_planes[type];
			} else {
				crtc[i] = UNMATCHED;
			}
		}

		match_obj(drm->num_type_planes[type], possible,
			drm->num_crtcs, crtc, crtc_res);

		for (size_t i = 0; i < drm->num_crtcs; ++i) {
			if (crtc_res[i] == UNMATCHED || crtc_res[i] == SKIP) {
				continue;
			}

			struct wlr_drm_crtc *c = &drm->crtcs[i];
			struct wlr_drm_plane **old = &c->planes[type];
			struct wlr_drm_plane *new = &drm->type_planes[type][crtc_res[i]];

			if (*old != new) {
				changed_outputs[crtc_res[i]] = true;
				if (*old) {
					wlr_drm_surface_finish(&(*old)->surf);
				}
				wlr_drm_surface_finish(&new->surf);
				*old = new;
			}
		}
	}
}

static void realloc_crtcs(struct wlr_drm_backend *drm,
		struct wlr_drm_connector *conn, bool *changed_outputs) {
	uint32_t crtc[drm->num_crtcs];
	uint32_t crtc_res[drm->num_crtcs];
	ssize_t num_outputs = wl_list_length(&drm->outputs);
	uint32_t possible_crtc[num_outputs];

	for (size_t i = 0; i < drm->num_crtcs; ++i) {
		crtc[i] = UNMATCHED;
	}

	memset(possible_crtc, 0, sizeof(possible_crtc));

	ssize_t index = -1, i = -1;
	struct wlr_drm_connector *c;
	wl_list_for_each(c, &drm->outputs, link) {
		i++;
		if (c == conn) {
			index = i;
		}

		if (c->crtc) {
			crtc[c->crtc - drm->crtcs] = i;
		}

		if (c->state == WLR_DRM_CONN_CONNECTED) {
			possible_crtc[i] = c->possible_crtc;
		}

	}
	assert(index != -1);

	possible_crtc[index] = conn->possible_crtc;
	match_obj(wl_list_length(&drm->outputs), possible_crtc,
		drm->num_crtcs, crtc, crtc_res);

	bool matched[num_outputs];
	memset(matched, false, sizeof(matched));
	for (size_t i = 0; i < drm->num_crtcs; ++i) {
		if (crtc_res[i] != UNMATCHED) {
			matched[crtc_res[i]] = true;
		}
	}

	// There is no point doing anything if this monitor doesn't get activated
	if (!matched[index]) {
		return;
	}

	for (size_t i = 0; i < drm->num_crtcs; ++i) {
		// We don't want any of the current monitors to be deactivated.
		if (crtc[i] != UNMATCHED && !matched[crtc[i]]) {
			return;
		}
	}

	changed_outputs[index] = true;

	for (size_t i = 0; i < drm->num_crtcs; ++i) {
		if (crtc_res[i] == UNMATCHED) {
			continue;
		}

		if (crtc_res[i] != crtc[i]) {
			changed_outputs[crtc_res[i]] = true;
			struct wlr_drm_connector *c;
			size_t pos = 0;
			wl_list_for_each(c, &drm->outputs, link) {
				if (pos == crtc_res[i]) {
					break;
				}
				pos++;
			}
			c->crtc = &drm->crtcs[i];
		}
	}

	realloc_planes(drm, crtc_res, changed_outputs);
}

static uint32_t get_possible_crtcs(int fd, uint32_t conn_id) {
	drmModeConnector *conn = drmModeGetConnector(fd, conn_id);
	if (!conn) {
		wlr_log_errno(L_ERROR, "Failed to get DRM connector");
		return 0;
	}

	if (conn->connection != DRM_MODE_CONNECTED || conn->count_modes == 0) {
		wlr_log(L_ERROR, "Output is not connected");
		goto error_conn;
	}

	drmModeEncoder *enc = NULL;
	for (int i = 0; !enc && i < conn->count_encoders; ++i) {
		enc = drmModeGetEncoder(fd, conn->encoders[i]);
	}

	if (!enc) {
		wlr_log(L_ERROR, "Failed to get DRM encoder");
		goto error_conn;
	}

	uint32_t ret = enc->possible_crtcs;
	drmModeFreeEncoder(enc);
	drmModeFreeConnector(conn);
	return ret;

error_conn:
	drmModeFreeConnector(conn);
	return 0;
}

static bool wlr_drm_connector_set_mode(struct wlr_output *output,
		struct wlr_output_mode *mode) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
	bool changed_outputs[wl_list_length(&drm->outputs)];

	wlr_log(L_INFO, "Modesetting '%s' with '%ux%u@%u mHz'", conn->output.name,
			mode->width, mode->height, mode->refresh);

	conn->possible_crtc = get_possible_crtcs(drm->fd, conn->id);
	if (conn->possible_crtc == 0) {
		goto error_conn;
	}

	memset(changed_outputs, false, sizeof(changed_outputs));
	realloc_crtcs(drm, conn, changed_outputs);

	if (!conn->crtc) {
		wlr_log(L_ERROR, "Unable to match %s with a CRTC", conn->output.name);
		goto error_conn;
	}

	struct wlr_drm_crtc *crtc = conn->crtc;
	wlr_log(L_DEBUG, "%s: crtc=%ju ovr=%jd pri=%jd cur=%jd", conn->output.name,
		crtc - drm->crtcs,
		crtc->overlay ? crtc->overlay - drm->overlay_planes : -1,
		crtc->primary ? crtc->primary - drm->primary_planes : -1,
		crtc->cursor ? crtc->cursor - drm->cursor_planes : -1);

	conn->state = WLR_DRM_CONN_CONNECTED;
	conn->output.current_mode = mode;
	if (conn->output.width != mode->width || conn->output.height != mode->height) {
		conn->output.width = mode->width;
		conn->output.height = mode->height;
		wl_signal_emit(&conn->output.events.resolution, &conn->output);
	}

	// Since realloc_crtcs can deallocate planes on OTHER outputs,
	// we actually need to reinitalise any than has changed
	ssize_t output_index = -1;
	wl_list_for_each(conn, &drm->outputs, link) {
		output_index += 1;
		struct wlr_output_mode *mode = conn->output.current_mode;
		struct wlr_drm_crtc *crtc = conn->crtc;

		if (conn->state != WLR_DRM_CONN_CONNECTED ||
				!changed_outputs[output_index]) {
			continue;
		}

		if (!wlr_drm_plane_surfaces_init(crtc->primary, drm,
				mode->width, mode->height, GBM_FORMAT_XRGB8888)) {
			wlr_log(L_ERROR, "Failed to initalise renderer for plane");
			goto error_conn;
		}

		wlr_drm_connector_start_renderer(conn);
	}

	return true;

error_conn:
	wlr_drm_connector_cleanup(conn);
	return false;
}

static void wlr_drm_connector_transform(struct wlr_output *output,
		enum wl_output_transform transform) {
	output->transform = transform;
}

static bool wlr_drm_connector_set_cursor(struct wlr_output *output,
		const uint8_t *buf, int32_t stride, uint32_t width, uint32_t height,
		int32_t hotspot_x, int32_t hotspot_y, bool update_pixels) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;
	struct wlr_drm_renderer *renderer = &drm->renderer;

	struct wlr_drm_crtc *crtc = conn->crtc;
	struct wlr_drm_plane *plane = crtc->cursor;

	// We don't have a real cursor plane, so we make a fake one
	if (!plane) {
		plane = calloc(1, sizeof(*plane));
		if (!plane) {
			wlr_log_errno(L_ERROR, "Allocation failed");
			return false;
		}
		crtc->cursor = plane;
	}

	if (!buf && update_pixels) {
		// Hide the cursor
		plane->cursor_enabled = false;
		return drm->iface->crtc_set_cursor(drm, crtc, NULL);
	}
	plane->cursor_enabled = true;

	if (!plane->surf.gbm) {
		int ret;
		uint64_t w, h;
		ret = drmGetCap(drm->fd, DRM_CAP_CURSOR_WIDTH, &w);
		w = ret ? 64 : w;
		ret = drmGetCap(drm->fd, DRM_CAP_CURSOR_HEIGHT, &h);
		h = ret ? 64 : h;

		if (width > w || height > h) {
			wlr_log(L_INFO, "Cursor too large (max %dx%d)", (int)w, (int)h);
			return false;
		}

		if (!wlr_drm_surface_init(&plane->surf, renderer, w, h, GBM_FORMAT_ARGB8888, 0)) {
			wlr_log(L_ERROR, "Cannot allocate cursor resources");
			return false;
		}

		plane->cursor_bo = gbm_bo_create(renderer->gbm, w, h, GBM_FORMAT_ARGB8888,
			GBM_BO_USE_CURSOR | GBM_BO_USE_WRITE);
		if (!plane->cursor_bo) {
			wlr_log_errno(L_ERROR, "Failed to create cursor bo");
			return false;
		}

		// OpenGL will read the pixels out upside down,
		// so we need to flip the image vertically
		wlr_matrix_texture(plane->matrix, plane->surf.width, plane->surf.height,
			conn->output.transform ^ WL_OUTPUT_TRANSFORM_FLIPPED_180);

		// TODO the image needs to be rotated depending on the output rotation

		plane->wlr_tex = wlr_render_texture_create(plane->surf.renderer->wlr_rend);
		if (!plane->wlr_tex) {
			return false;
		}
	}

	// TODO: this doesn't belong here
	// switch (output->transform) {
	// case WL_OUTPUT_TRANSFORM_90:
	// 	output->cursor.hotspot_x = hotspot_x;
	// 	output->cursor.hotspot_y = -plane->surf.height + hotspot_y;
	// 	break;
	// case WL_OUTPUT_TRANSFORM_180:
	// 	output->cursor.hotspot_x = plane->surf.width - hotspot_x;
	// 	output->cursor.hotspot_y = plane->surf.height - hotspot_y;
	// 	break;
	// case WL_OUTPUT_TRANSFORM_270:
	// 	output->cursor.hotspot_x = -plane->surf.height + hotspot_x;
	// 	output->cursor.hotspot_y = hotspot_y;
	// 	break;
	// case WL_OUTPUT_TRANSFORM_FLIPPED:
	// 	output->cursor.hotspot_x = plane->surf.width - hotspot_x;
	// 	output->cursor.hotspot_y = hotspot_y;
	// 	break;
	// case WL_OUTPUT_TRANSFORM_FLIPPED_90:
	// 	output->cursor.hotspot_x = hotspot_x;
	// 	output->cursor.hotspot_y = -hotspot_y;
	// 	break;
	// case WL_OUTPUT_TRANSFORM_FLIPPED_180:
	// 	output->cursor.hotspot_x = hotspot_x;
	// 	output->cursor.hotspot_y = plane->surf.height - hotspot_y;
	// 	break;
	// case WL_OUTPUT_TRANSFORM_FLIPPED_270:
	// 	output->cursor.hotspot_x = -plane->surf.height + hotspot_x;
	// 	output->cursor.hotspot_y = plane->surf.width - hotspot_y;
	// 	break;
	// }

	if (!update_pixels) {
		// Only update the cursor hotspot
		return true;
	}

	struct gbm_bo *bo = plane->cursor_bo;
	uint32_t bo_width = gbm_bo_get_width(bo);
	uint32_t bo_height = gbm_bo_get_height(bo);
	uint32_t bo_stride;
	void *bo_data;

	if (!gbm_bo_map(bo, 0, 0, bo_width, bo_height,
			GBM_BO_TRANSFER_WRITE, &bo_stride, &bo_data)) {
		wlr_log_errno(L_ERROR, "Unable to map buffer");
		return false;
	}

	wlr_drm_surface_make_current(&plane->surf);

	wlr_texture_upload_pixels(plane->wlr_tex, WL_SHM_FORMAT_ARGB8888,
		stride, width, height, buf);

	glViewport(0, 0, plane->surf.width, plane->surf.height);
	glClearColor(0.0, 0.0, 0.0, 0.0);
	glClear(GL_COLOR_BUFFER_BIT);

	float matrix[16];
	wlr_texture_get_matrix(plane->wlr_tex, &matrix, &plane->matrix, 0, 0);
	wlr_render_with_matrix(plane->surf.renderer->wlr_rend, plane->wlr_tex, &matrix);

	glFinish();
	glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, bo_stride);
	glReadPixels(0, 0, plane->surf.width, plane->surf.height, GL_BGRA_EXT, GL_UNSIGNED_BYTE, bo_data);
	glPixelStorei(GL_UNPACK_ROW_LENGTH_EXT, 0);

	wlr_drm_surface_swap_buffers(&plane->surf);

	gbm_bo_unmap(bo, bo_data);

	return drm->iface->crtc_set_cursor(drm, crtc, bo);
}

static bool wlr_drm_connector_move_cursor(struct wlr_output *output,
		int x, int y) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)output->backend;

	int width, height, tmp;
	wlr_output_effective_resolution(output, &width, &height);

	switch (output->transform) {
	case WL_OUTPUT_TRANSFORM_NORMAL:
	case WL_OUTPUT_TRANSFORM_FLIPPED:
	case WL_OUTPUT_TRANSFORM_FLIPPED_180:
		// nothing to do
		break;
	case WL_OUTPUT_TRANSFORM_270:
	case WL_OUTPUT_TRANSFORM_FLIPPED_270:
		tmp = x;
		x = y;
		y = -(tmp - width);
		break;
	case WL_OUTPUT_TRANSFORM_90:
	case WL_OUTPUT_TRANSFORM_FLIPPED_90:
		tmp = x;
		x = -(y - height);
		y = tmp;
		break;
	}

	return drm->iface->crtc_move_cursor(drm, conn->crtc, x, y);
}

static void wlr_drm_connector_destroy(struct wlr_output *output) {
	struct wlr_drm_connector *conn = (struct wlr_drm_connector *)output;
	wlr_drm_connector_cleanup(conn);
	wl_event_source_remove(conn->retry_pageflip);
	free(conn);
}

static struct wlr_output_impl output_impl = {
	.enable = wlr_drm_connector_enable,
	.set_mode = wlr_drm_connector_set_mode,
	.transform = wlr_drm_connector_transform,
	.set_cursor = wlr_drm_connector_set_cursor,
	.move_cursor = wlr_drm_connector_move_cursor,
	.destroy = wlr_drm_connector_destroy,
	.make_current = wlr_drm_connector_make_current,
	.swap_buffers = wlr_drm_connector_swap_buffers,
	.set_gamma = wlr_drm_connector_set_gamma,
	.get_gamma_size = wlr_drm_connector_get_gamma_size,
};

static int retry_pageflip(void *data) {
	struct wlr_drm_connector *conn = data;
	wlr_log(L_INFO, "%s: Retrying pageflip", conn->output.name);
	wlr_drm_connector_start_renderer(conn);
	return 0;
}

static const int32_t subpixel_map[] = {
	[DRM_MODE_SUBPIXEL_UNKNOWN] = WL_OUTPUT_SUBPIXEL_UNKNOWN,
	[DRM_MODE_SUBPIXEL_HORIZONTAL_RGB] = WL_OUTPUT_SUBPIXEL_HORIZONTAL_RGB,
	[DRM_MODE_SUBPIXEL_HORIZONTAL_BGR] = WL_OUTPUT_SUBPIXEL_HORIZONTAL_BGR,
	[DRM_MODE_SUBPIXEL_VERTICAL_RGB] = WL_OUTPUT_SUBPIXEL_VERTICAL_RGB,
	[DRM_MODE_SUBPIXEL_VERTICAL_BGR] = WL_OUTPUT_SUBPIXEL_VERTICAL_BGR,
	[DRM_MODE_SUBPIXEL_NONE] = WL_OUTPUT_SUBPIXEL_NONE,
};

void wlr_drm_scan_connectors(struct wlr_drm_backend *drm) {
	wlr_log(L_INFO, "Scanning DRM connectors");

	drmModeRes *res = drmModeGetResources(drm->fd);
	if (!res) {
		wlr_log_errno(L_ERROR, "Failed to get DRM resources");
		return;
	}

	size_t seen_len = wl_list_length(&drm->outputs);
	// +1 so length can never be 0, which is undefined behaviour.
	// Last element isn't used.
	bool seen[seen_len + 1];
	memset(seen, 0, sizeof(seen));

	for (int i = 0; i < res->count_connectors; ++i) {
		drmModeConnector *drm_conn = drmModeGetConnector(drm->fd,
			res->connectors[i]);
		if (!drm_conn) {
			wlr_log_errno(L_ERROR, "Failed to get DRM connector");
			continue;
		}
		drmModeEncoder *curr_enc = drmModeGetEncoder(drm->fd,
			drm_conn->encoder_id);

		int index = -1;
		struct wlr_drm_connector *c, *wlr_conn = NULL;
		wl_list_for_each(c, &drm->outputs, link) {
			index++;
			if (c->id == drm_conn->connector_id) {
				wlr_conn = c;
				break;
			}
		}

		if (!wlr_conn) {
			wlr_conn = calloc(1, sizeof(*wlr_conn));
			if (!wlr_conn) {
				wlr_log_errno(L_ERROR, "Allocation failed");
				drmModeFreeEncoder(curr_enc);
				drmModeFreeConnector(drm_conn);
				continue;
			}
			wlr_output_init(&wlr_conn->output, &drm->backend, &output_impl);

			struct wl_event_loop *ev = wl_display_get_event_loop(drm->display);
			wlr_conn->retry_pageflip = wl_event_loop_add_timer(ev, retry_pageflip,
				wlr_conn);


			wlr_conn->state = WLR_DRM_CONN_DISCONNECTED;
			wlr_conn->id = drm_conn->connector_id;

			if (curr_enc) {
				wlr_conn->old_crtc = drmModeGetCrtc(drm->fd, curr_enc->crtc_id);
			}

			wlr_conn->output.phys_width = drm_conn->mmWidth;
			wlr_conn->output.phys_height = drm_conn->mmHeight;
			wlr_conn->output.subpixel = subpixel_map[drm_conn->subpixel];
			snprintf(wlr_conn->output.name, sizeof(wlr_conn->output.name),
				"%s-%"PRIu32,
				 conn_get_name(drm_conn->connector_type),
				 drm_conn->connector_type_id);

			wlr_drm_get_connector_props(drm->fd, wlr_conn->id, &wlr_conn->props);

			size_t edid_len = 0;
			uint8_t *edid = wlr_drm_get_prop_blob(drm->fd,
				wlr_conn->id, wlr_conn->props.edid, &edid_len);
			parse_edid(&wlr_conn->output, edid_len, edid);
			free(edid);

			wl_list_insert(&drm->outputs, &wlr_conn->link);
			wlr_log(L_INFO, "Found display '%s'", wlr_conn->output.name);
		} else {
			seen[index] = true;
		}

		if (curr_enc) {
			for (size_t i = 0; i < drm->num_crtcs; ++i) {
				if (drm->crtcs[i].id == curr_enc->crtc_id) {
					wlr_conn->crtc = &drm->crtcs[i];
					break;
				}
			}
		} else {
			wlr_conn->crtc = NULL;
		}

		if (wlr_conn->state == WLR_DRM_CONN_DISCONNECTED &&
				drm_conn->connection == DRM_MODE_CONNECTED) {
			wlr_log(L_INFO, "'%s' connected", wlr_conn->output.name);
			wlr_log(L_INFO, "Detected modes:");

			for (int i = 0; i < drm_conn->count_modes; ++i) {
				struct wlr_drm_mode *mode = calloc(1, sizeof(*mode));
				if (!mode) {
					wlr_log_errno(L_ERROR, "Allocation failed");
					continue;
				}
				mode->drm_mode = drm_conn->modes[i];
				mode->wlr_mode.width = mode->drm_mode.hdisplay;
				mode->wlr_mode.height = mode->drm_mode.vdisplay;
				mode->wlr_mode.refresh = calculate_refresh_rate(&mode->drm_mode);

				wlr_log(L_INFO, "  %"PRId32"@%"PRId32"@%"PRId32,
					mode->wlr_mode.width, mode->wlr_mode.height,
					mode->wlr_mode.refresh);

				wl_list_insert(&wlr_conn->output.modes, &mode->wlr_mode.link);
			}

			wlr_output_create_global(&wlr_conn->output, drm->display);

			wlr_conn->state = WLR_DRM_CONN_NEEDS_MODESET;
			wlr_log(L_INFO, "Sending modesetting signal for '%s'",
				wlr_conn->output.name);
			wl_signal_emit(&drm->backend.events.output_add, &wlr_conn->output);
		} else if (wlr_conn->state == WLR_DRM_CONN_CONNECTED &&
				drm_conn->connection != DRM_MODE_CONNECTED) {
			wlr_log(L_INFO, "'%s' disconnected", wlr_conn->output.name);

			wlr_output_destroy_global(&wlr_conn->output);
			wlr_drm_connector_cleanup(wlr_conn);
		}

		drmModeFreeEncoder(curr_enc);
		drmModeFreeConnector(drm_conn);
	}

	drmModeFreeResources(res);

	struct wlr_drm_connector *conn, *tmp_conn;
	size_t index = wl_list_length(&drm->outputs);
	wl_list_for_each_safe(conn, tmp_conn, &drm->outputs, link) {
		index--;
		if (index >= seen_len || seen[index]) {
			continue;
		}

		wlr_log(L_INFO, "'%s' disappeared", conn->output.name);
		wlr_drm_connector_cleanup(conn);

		drmModeFreeCrtc(conn->old_crtc);
		wl_event_source_remove(conn->retry_pageflip);
		free(conn);
	}
}

static void page_flip_handler(int fd, unsigned seq,
		unsigned tv_sec, unsigned tv_usec, void *user) {
	struct wlr_drm_connector *conn = user;
	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)conn->output.backend;

	conn->pageflip_pending = false;
	if (conn->state != WLR_DRM_CONN_CONNECTED) {
		return;
	}

	wlr_drm_surface_post(&conn->crtc->primary->surf);
	if (drm->parent) {
		wlr_drm_surface_post(&conn->crtc->primary->mgpu_surf);
	}

	if (drm->session->active) {
		wl_signal_emit(&conn->output.events.frame, &conn->output);
	}
}

int wlr_drm_event(int fd, uint32_t mask, void *data) {
	drmEventContext event = {
		.version = DRM_EVENT_CONTEXT_VERSION,
		.page_flip_handler = page_flip_handler,
	};

	drmHandleEvent(fd, &event);
	return 1;
}

void wlr_drm_restore_outputs(struct wlr_drm_backend *drm) {
	uint64_t to_close = (1 << wl_list_length(&drm->outputs)) - 1;

	struct wlr_drm_connector *conn;
	wl_list_for_each(conn, &drm->outputs, link) {
		if (conn->state == WLR_DRM_CONN_CONNECTED) {
			conn->state = WLR_DRM_CONN_CLEANUP;
		}
	}

	time_t timeout = time(NULL) + 5;

	while (to_close && time(NULL) < timeout) {
		wlr_drm_event(drm->fd, 0, NULL);
		size_t i = 0;
		struct wlr_drm_connector *conn;
		wl_list_for_each(conn, &drm->outputs, link) {
			if (conn->state != WLR_DRM_CONN_CLEANUP || !conn->pageflip_pending) {
				to_close &= ~(1 << i);
			}
			i++;
		}
	}

	if (to_close) {
		wlr_log(L_ERROR, "Timed out stopping output renderers");
	}

	wl_list_for_each(conn, &drm->outputs, link) {
		drmModeCrtc *crtc = conn->old_crtc;
		if (!crtc) {
			continue;
		}

		drmModeSetCrtc(drm->fd, crtc->crtc_id, crtc->buffer_id, crtc->x, crtc->y,
			&conn->id, 1, &crtc->mode);
		drmModeFreeCrtc(crtc);
	}
}

void wlr_drm_connector_cleanup(struct wlr_drm_connector *conn) {
	if (!conn) {
		return;
	}

	struct wlr_drm_backend *drm = (struct wlr_drm_backend *)conn->output.backend;

	switch (conn->state) {
	case WLR_DRM_CONN_CONNECTED:
	case WLR_DRM_CONN_CLEANUP:;
		struct wlr_drm_crtc *crtc = conn->crtc;
		for (int i = 0; i < 3; ++i) {
			if (!crtc->planes[i]) {
				continue;
			}

			wlr_drm_surface_finish(&crtc->planes[i]->surf);
			wlr_drm_surface_finish(&crtc->planes[i]->mgpu_surf);
			if (crtc->planes[i]->id == 0) {
				free(crtc->planes[i]);
				crtc->planes[i] = NULL;
			}
		}

		conn->crtc = NULL;
		conn->possible_crtc = 0;
		/* Fallthrough */
	case WLR_DRM_CONN_NEEDS_MODESET:
		wlr_log(L_INFO, "Emmiting destruction signal for '%s'",
				conn->output.name);
		wl_signal_emit(&drm->backend.events.output_remove, &conn->output);
		break;
	case WLR_DRM_CONN_DISCONNECTED:
		break;
	}

	conn->state = WLR_DRM_CONN_DISCONNECTED;
}