summaryrefslogtreecommitdiff
path: root/dom/canvas/WebGLFormats.cpp
blob: d2fc38548480e672581d6cdcce17420fd6971467 (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
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "WebGLFormats.h"

#include "gfxPrefs.h"
#include "GLContext.h"
#include "GLDefs.h"
#include "mozilla/gfx/Logging.h"
#include "mozilla/StaticMutex.h"

#ifdef FOO
#error FOO is already defined! We use FOO() macros to keep things succinct in this file.
#endif

namespace mozilla {
namespace webgl {

template<typename K, typename V, typename K2, typename V2>
static inline void
AlwaysInsert(std::map<K,V>& dest, const K2& key, const V2& val)
{
    auto res = dest.insert({ key, val });
    bool didInsert = res.second;
    MOZ_ALWAYS_TRUE(didInsert);
}

template<typename K, typename V, typename K2>
static inline V*
FindOrNull(const std::map<K,V*>& dest, const K2& key)
{
    auto itr = dest.find(key);
    if (itr == dest.end())
        return nullptr;

    return itr->second;
}

// Returns a pointer to the in-place value for `key`.
template<typename K, typename V, typename K2>
static inline V*
FindPtrOrNull(std::map<K,V>& dest, const K2& key)
{
    auto itr = dest.find(key);
    if (itr == dest.end())
        return nullptr;

    return &(itr->second);
}

//////////////////////////////////////////////////////////////////////////////////////////

std::map<EffectiveFormat, const CompressedFormatInfo> gCompressedFormatInfoMap;
std::map<EffectiveFormat, FormatInfo> gFormatInfoMap;

static inline const CompressedFormatInfo*
GetCompressedFormatInfo(EffectiveFormat format)
{
    MOZ_ASSERT(!gCompressedFormatInfoMap.empty());
    return FindPtrOrNull(gCompressedFormatInfoMap, format);
}

static inline FormatInfo*
GetFormatInfo_NoLock(EffectiveFormat format)
{
    MOZ_ASSERT(!gFormatInfoMap.empty());
    return FindPtrOrNull(gFormatInfoMap, format);
}

//////////////////////////////////////////////////////////////////////////////////////////

static void
AddCompressedFormatInfo(EffectiveFormat format, uint16_t bitsPerBlock, uint8_t blockWidth,
                        uint8_t blockHeight, CompressionFamily family)
{
    MOZ_ASSERT(bitsPerBlock % 8 == 0);
    uint16_t bytesPerBlock = bitsPerBlock / 8; // The specs always state these in bits,
                                               // but it's only ever useful to us as
                                               // bytes.
    MOZ_ASSERT(bytesPerBlock <= 255);

    const CompressedFormatInfo info = { format, uint8_t(bytesPerBlock), blockWidth,
                                        blockHeight, family };
    AlwaysInsert(gCompressedFormatInfoMap, format, info);
}

static void
InitCompressedFormatInfo()
{
    // GLES 3.0.4, p147, table 3.19
    // GLES 3.0.4, p286+, $C.1 "ETC Compressed Texture Image Formats"
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGB8_ETC2                     ,  64, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_SRGB8_ETC2                    ,  64, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGBA8_ETC2_EAC                , 128, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_SRGB8_ALPHA8_ETC2_EAC         , 128, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_R11_EAC                       ,  64, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RG11_EAC                      , 128, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_SIGNED_R11_EAC                ,  64, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_SIGNED_RG11_EAC               , 128, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 ,  64, 4, 4, CompressionFamily::ES3);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2,  64, 4, 4, CompressionFamily::ES3);

    // AMD_compressed_ATC_texture
    AddCompressedFormatInfo(EffectiveFormat::ATC_RGB_AMD                    ,  64, 4, 4, CompressionFamily::ATC);
    AddCompressedFormatInfo(EffectiveFormat::ATC_RGBA_EXPLICIT_ALPHA_AMD    , 128, 4, 4, CompressionFamily::ATC);
    AddCompressedFormatInfo(EffectiveFormat::ATC_RGBA_INTERPOLATED_ALPHA_AMD, 128, 4, 4, CompressionFamily::ATC);

    // EXT_texture_compression_s3tc
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGB_S3TC_DXT1_EXT ,  64, 4, 4, CompressionFamily::S3TC);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGBA_S3TC_DXT1_EXT,  64, 4, 4, CompressionFamily::S3TC);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGBA_S3TC_DXT3_EXT, 128, 4, 4, CompressionFamily::S3TC);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGBA_S3TC_DXT5_EXT, 128, 4, 4, CompressionFamily::S3TC);

    // IMG_texture_compression_pvrtc
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGB_PVRTC_4BPPV1 , 256,  8, 8, CompressionFamily::PVRTC);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGBA_PVRTC_4BPPV1, 256,  8, 8, CompressionFamily::PVRTC);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGB_PVRTC_2BPPV1 , 256, 16, 8, CompressionFamily::PVRTC);
    AddCompressedFormatInfo(EffectiveFormat::COMPRESSED_RGBA_PVRTC_2BPPV1, 256, 16, 8, CompressionFamily::PVRTC);

    // OES_compressed_ETC1_RGB8_texture
    AddCompressedFormatInfo(EffectiveFormat::ETC1_RGB8_OES, 64, 4, 4, CompressionFamily::ETC1);
}

//////////////////////////////////////////////////////////////////////////////////////////

static void
AddFormatInfo(EffectiveFormat format, const char* name, GLenum sizedFormat,
              uint8_t bytesPerPixel, uint8_t r, uint8_t g, uint8_t b, uint8_t a,
              uint8_t d, uint8_t s, UnsizedFormat unsizedFormat, bool isSRGB,
              ComponentType componentType)
{
    switch (unsizedFormat) {
    case UnsizedFormat::R:
        MOZ_ASSERT(r && !g && !b && !a && !d && !s);
        break;

    case UnsizedFormat::RG:
        MOZ_ASSERT(r && g && !b && !a && !d && !s);
        break;

    case UnsizedFormat::RGB:
        MOZ_ASSERT(r && g && b && !a && !d && !s);
        break;

    case UnsizedFormat::RGBA:
        MOZ_ASSERT(r && g && b && a && !d && !s);
        break;

    case UnsizedFormat::L:
        MOZ_ASSERT(r && !g && !b && !a && !d && !s);
        break;

    case UnsizedFormat::A:
        MOZ_ASSERT(!r && !g && !b && a && !d && !s);
        break;

    case UnsizedFormat::LA:
        MOZ_ASSERT(r && !g && !b && a && !d && !s);
        break;

    case UnsizedFormat::D:
        MOZ_ASSERT(!r && !g && !b && !a && d && !s);
        break;

    case UnsizedFormat::S:
        MOZ_ASSERT(!r && !g && !b && !a && !d && s);
        break;

    case UnsizedFormat::DEPTH_STENCIL:
        MOZ_ASSERT(!r && !g && !b && !a && d && s);
        break;
    }

    const CompressedFormatInfo* compressedFormatInfo = GetCompressedFormatInfo(format);
    MOZ_ASSERT(!bytesPerPixel == bool(compressedFormatInfo));

#ifdef DEBUG
    uint8_t totalBits = r + g + b + a + d + s;
    if (format == EffectiveFormat::RGB9_E5) {
        totalBits = 9 + 9 + 9 + 5;
    }

    if (compressedFormatInfo) {
        MOZ_ASSERT(totalBits);
        MOZ_ASSERT(!bytesPerPixel);
    } else {
        MOZ_ASSERT(totalBits == bytesPerPixel*8);
    }
#endif

    const FormatInfo info = { format, name, sizedFormat, unsizedFormat, componentType,
                              isSRGB, compressedFormatInfo, bytesPerPixel, r,g,b,a,d,s };
    AlwaysInsert(gFormatInfoMap, format, info);
}

static void
InitFormatInfo()
{
#define FOO(x) EffectiveFormat::x, #x, LOCAL_GL_ ## x

    // GLES 3.0.4, p130-132, table 3.13
    AddFormatInfo(FOO(R8            ),  1,  8, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(R8_SNORM      ),  1,  8, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::NormInt );
    AddFormatInfo(FOO(RG8           ),  2,  8, 8, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(RG8_SNORM     ),  2,  8, 8, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::NormInt );
    AddFormatInfo(FOO(RGB8          ),  3,  8, 8, 8, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(RGB8_SNORM    ),  3,  8, 8, 8, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::NormInt );
    AddFormatInfo(FOO(RGB565        ),  2,  5, 6, 5, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(RGBA4         ),  2,  4, 4, 4, 4,  0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(RGB5_A1       ),  2,  5, 5, 5, 1,  0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(RGBA8         ),  4,  8, 8, 8, 8,  0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(RGBA8_SNORM   ),  4,  8, 8, 8, 8,  0,0, UnsizedFormat::RGBA, false, ComponentType::NormInt );
    AddFormatInfo(FOO(RGB10_A2      ),  4, 10,10,10, 2,  0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(RGB10_A2UI    ),  4, 10,10,10, 2,  0,0, UnsizedFormat::RGBA, false, ComponentType::UInt    );

    AddFormatInfo(FOO(SRGB8         ),  3,  8, 8, 8, 0,  0,0, UnsizedFormat::RGB , true , ComponentType::NormUInt);
    AddFormatInfo(FOO(SRGB8_ALPHA8  ),  4,  8, 8, 8, 8,  0,0, UnsizedFormat::RGBA, true , ComponentType::NormUInt);

    AddFormatInfo(FOO(R16F          ),  2, 16, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::Float   );
    AddFormatInfo(FOO(RG16F         ),  4, 16,16, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::Float   );
    AddFormatInfo(FOO(RGB16F        ),  6, 16,16,16, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::Float   );
    AddFormatInfo(FOO(RGBA16F       ),  8, 16,16,16,16,  0,0, UnsizedFormat::RGBA, false, ComponentType::Float   );
    AddFormatInfo(FOO(R32F          ),  4, 32, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::Float   );
    AddFormatInfo(FOO(RG32F         ),  8, 32,32, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::Float   );
    AddFormatInfo(FOO(RGB32F        ), 12, 32,32,32, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::Float   );
    AddFormatInfo(FOO(RGBA32F       ), 16, 32,32,32,32,  0,0, UnsizedFormat::RGBA, false, ComponentType::Float   );

    AddFormatInfo(FOO(R11F_G11F_B10F),  4, 11,11,10, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::Float   );
    AddFormatInfo(FOO(RGB9_E5       ),  4, 14,14,14, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::Float   );

    AddFormatInfo(FOO(R8I           ),  1,  8, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::Int     );
    AddFormatInfo(FOO(R8UI          ),  1,  8, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::UInt    );
    AddFormatInfo(FOO(R16I          ),  2, 16, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::Int     );
    AddFormatInfo(FOO(R16UI         ),  2, 16, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::UInt    );
    AddFormatInfo(FOO(R32I          ),  4, 32, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::Int     );
    AddFormatInfo(FOO(R32UI         ),  4, 32, 0, 0, 0,  0,0, UnsizedFormat::R   , false, ComponentType::UInt    );

    AddFormatInfo(FOO(RG8I          ),  2,  8, 8, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::Int     );
    AddFormatInfo(FOO(RG8UI         ),  2,  8, 8, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::UInt    );
    AddFormatInfo(FOO(RG16I         ),  4, 16,16, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::Int     );
    AddFormatInfo(FOO(RG16UI        ),  4, 16,16, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::UInt    );
    AddFormatInfo(FOO(RG32I         ),  8, 32,32, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::Int     );
    AddFormatInfo(FOO(RG32UI        ),  8, 32,32, 0, 0,  0,0, UnsizedFormat::RG  , false, ComponentType::UInt    );

    AddFormatInfo(FOO(RGB8I         ),  3,  8, 8, 8, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::Int     );
    AddFormatInfo(FOO(RGB8UI        ),  3,  8, 8, 8, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::UInt    );
    AddFormatInfo(FOO(RGB16I        ),  6, 16,16,16, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::Int     );
    AddFormatInfo(FOO(RGB16UI       ),  6, 16,16,16, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::UInt    );
    AddFormatInfo(FOO(RGB32I        ), 12, 32,32,32, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::Int     );
    AddFormatInfo(FOO(RGB32UI       ), 12, 32,32,32, 0,  0,0, UnsizedFormat::RGB , false, ComponentType::UInt    );

    AddFormatInfo(FOO(RGBA8I        ),  4,  8, 8, 8, 8,  0,0, UnsizedFormat::RGBA, false, ComponentType::Int     );
    AddFormatInfo(FOO(RGBA8UI       ),  4,  8, 8, 8, 8,  0,0, UnsizedFormat::RGBA, false, ComponentType::UInt    );
    AddFormatInfo(FOO(RGBA16I       ),  8, 16,16,16,16,  0,0, UnsizedFormat::RGBA, false, ComponentType::Int     );
    AddFormatInfo(FOO(RGBA16UI      ),  8, 16,16,16,16,  0,0, UnsizedFormat::RGBA, false, ComponentType::UInt    );
    AddFormatInfo(FOO(RGBA32I       ), 16, 32,32,32,32,  0,0, UnsizedFormat::RGBA, false, ComponentType::Int     );
    AddFormatInfo(FOO(RGBA32UI      ), 16, 32,32,32,32,  0,0, UnsizedFormat::RGBA, false, ComponentType::UInt    );

    // GLES 3.0.4, p133, table 3.14
    AddFormatInfo(FOO(DEPTH_COMPONENT16 ), 2, 0,0,0,0, 16,0, UnsizedFormat::D , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(DEPTH_COMPONENT24 ), 3, 0,0,0,0, 24,0, UnsizedFormat::D , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(DEPTH_COMPONENT32F), 4, 0,0,0,0, 32,0, UnsizedFormat::D , false, ComponentType::Float);
    AddFormatInfo(FOO(DEPTH24_STENCIL8  ), 4, 0,0,0,0, 24,8, UnsizedFormat::DEPTH_STENCIL, false, ComponentType::Special);
    AddFormatInfo(FOO(DEPTH32F_STENCIL8 ), 5, 0,0,0,0, 32,8, UnsizedFormat::DEPTH_STENCIL, false, ComponentType::Special);

    // GLES 3.0.4, p205-206, "Required Renderbuffer Formats"
    AddFormatInfo(FOO(STENCIL_INDEX8), 1, 0,0,0,0, 0,8, UnsizedFormat::S, false, ComponentType::UInt);

    // GLES 3.0.4, p147, table 3.19
    // GLES 3.0.4  p286+  $C.1 "ETC Compressed Texture Image Formats"
    AddFormatInfo(FOO(COMPRESSED_RGB8_ETC2                     ), 0, 1,1,1,0, 0,0, UnsizedFormat::RGB , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_SRGB8_ETC2                    ), 0, 1,1,1,0, 0,0, UnsizedFormat::RGB , true , ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_RGBA8_ETC2_EAC                ), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_SRGB8_ALPHA8_ETC2_EAC         ), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, true , ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_R11_EAC                       ), 0, 1,0,0,0, 0,0, UnsizedFormat::R   , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_RG11_EAC                      ), 0, 1,1,0,0, 0,0, UnsizedFormat::RG  , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_SIGNED_R11_EAC                ), 0, 1,0,0,0, 0,0, UnsizedFormat::R   , false, ComponentType::NormInt );
    AddFormatInfo(FOO(COMPRESSED_SIGNED_RG11_EAC               ), 0, 1,1,0,0, 0,0, UnsizedFormat::RG  , false, ComponentType::NormInt );
    AddFormatInfo(FOO(COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2 ), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, true , ComponentType::NormUInt);

    // AMD_compressed_ATC_texture
    AddFormatInfo(FOO(ATC_RGB_AMD                    ), 0, 1,1,1,0, 0,0, UnsizedFormat::RGB , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(ATC_RGBA_EXPLICIT_ALPHA_AMD    ), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(ATC_RGBA_INTERPOLATED_ALPHA_AMD), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);

    // EXT_texture_compression_s3tc
    AddFormatInfo(FOO(COMPRESSED_RGB_S3TC_DXT1_EXT ), 0, 1,1,1,0, 0,0, UnsizedFormat::RGB , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_RGBA_S3TC_DXT1_EXT), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_RGBA_S3TC_DXT3_EXT), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_RGBA_S3TC_DXT5_EXT), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);

    // IMG_texture_compression_pvrtc
    AddFormatInfo(FOO(COMPRESSED_RGB_PVRTC_4BPPV1 ), 0, 1,1,1,0, 0,0, UnsizedFormat::RGB , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_RGBA_PVRTC_4BPPV1), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_RGB_PVRTC_2BPPV1 ), 0, 1,1,1,0, 0,0, UnsizedFormat::RGB , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(COMPRESSED_RGBA_PVRTC_2BPPV1), 0, 1,1,1,1, 0,0, UnsizedFormat::RGBA, false, ComponentType::NormUInt);

    // OES_compressed_ETC1_RGB8_texture
    AddFormatInfo(FOO(ETC1_RGB8_OES), 0, 1,1,1,0, 0,0, UnsizedFormat::RGB, false, ComponentType::NormUInt);

#undef FOO

    // 'Virtual' effective formats have no sizedFormat.
#define FOO(x) EffectiveFormat::x, #x, 0

    // GLES 3.0.4, p128, table 3.12.
    AddFormatInfo(FOO(Luminance8Alpha8), 2, 8,0,0,8, 0,0, UnsizedFormat::LA, false, ComponentType::NormUInt);
    AddFormatInfo(FOO(Luminance8      ), 1, 8,0,0,0, 0,0, UnsizedFormat::L , false, ComponentType::NormUInt);
    AddFormatInfo(FOO(Alpha8          ), 1, 0,0,0,8, 0,0, UnsizedFormat::A , false, ComponentType::NormUInt);

    // OES_texture_float
    AddFormatInfo(FOO(Luminance32FAlpha32F), 8, 32,0,0,32, 0,0, UnsizedFormat::LA, false, ComponentType::Float);
    AddFormatInfo(FOO(Luminance32F        ), 4, 32,0,0, 0, 0,0, UnsizedFormat::L , false, ComponentType::Float);
    AddFormatInfo(FOO(Alpha32F            ), 4,  0,0,0,32, 0,0, UnsizedFormat::A , false, ComponentType::Float);

    // OES_texture_half_float
    AddFormatInfo(FOO(Luminance16FAlpha16F), 4, 16,0,0,16, 0,0, UnsizedFormat::LA, false, ComponentType::Float);
    AddFormatInfo(FOO(Luminance16F        ), 2, 16,0,0, 0, 0,0, UnsizedFormat::L , false, ComponentType::Float);
    AddFormatInfo(FOO(Alpha16F            ), 2,  0,0,0,16, 0,0, UnsizedFormat::A , false, ComponentType::Float);

#undef FOO

    ////////////////////////////////////////////////////////////////////////////

    const auto fnSetCopyDecay = [](EffectiveFormat src, EffectiveFormat asR,
                                   EffectiveFormat asRG, EffectiveFormat asRGB,
                                   EffectiveFormat asRGBA, EffectiveFormat asL,
                                   EffectiveFormat asA, EffectiveFormat asLA)
    {
        auto& map = GetFormatInfo_NoLock(src)->copyDecayFormats;

        const auto fnSet = [&map](UnsizedFormat uf, EffectiveFormat ef) {
            if (ef == EffectiveFormat::MAX)
                return;

            const auto* format = GetFormatInfo_NoLock(ef);
            MOZ_ASSERT(format->unsizedFormat == uf);
            AlwaysInsert(map, uf, format);
        };

        fnSet(UnsizedFormat::R   , asR);
        fnSet(UnsizedFormat::RG  , asRG);
        fnSet(UnsizedFormat::RGB , asRGB);
        fnSet(UnsizedFormat::RGBA, asRGBA);
        fnSet(UnsizedFormat::L   , asL);
        fnSet(UnsizedFormat::A   , asA);
        fnSet(UnsizedFormat::LA  , asLA);
    };

#define SET_COPY_DECAY(src,asR,asRG,asRGB,asRGBA,asL,asA,asLA) \
    fnSetCopyDecay(EffectiveFormat::src, EffectiveFormat::asR, EffectiveFormat::asRG,     \
                   EffectiveFormat::asRGB, EffectiveFormat::asRGBA, EffectiveFormat::asL, \
                   EffectiveFormat::asA, EffectiveFormat::asLA);

    //////

#define SET_BY_SUFFIX(X) \
        SET_COPY_DECAY(   R##X, R##X,   MAX,    MAX,     MAX, Luminance##X,      MAX,                    MAX) \
        SET_COPY_DECAY(  RG##X, R##X, RG##X,    MAX,     MAX, Luminance##X,      MAX,                    MAX) \
        SET_COPY_DECAY( RGB##X, R##X, RG##X, RGB##X,     MAX, Luminance##X,      MAX,                    MAX) \
        SET_COPY_DECAY(RGBA##X, R##X, RG##X, RGB##X, RGBA##X, Luminance##X, Alpha##X, Luminance##X##Alpha##X)

    SET_BY_SUFFIX(8)   // WebGL decided that RGB8 should be guaranteed renderable.
    SET_BY_SUFFIX(16F) // RGB16F is renderable in EXT_color_buffer_half_float, though not
                       // EXT_color_buffer_float.
    SET_BY_SUFFIX(32F) // Technically RGB32F is never renderable, but no harm here.

#undef SET_BY_SUFFIX

    //////

#define SET_BY_SUFFIX(X) \
        SET_COPY_DECAY(   R##X, R##X,   MAX,    MAX,     MAX, MAX, MAX, MAX) \
        SET_COPY_DECAY(  RG##X, R##X, RG##X,    MAX,     MAX, MAX, MAX, MAX) \
        SET_COPY_DECAY(RGBA##X, R##X, RG##X, RGB##X, RGBA##X, MAX, MAX, MAX)

    SET_BY_SUFFIX(8I)
    SET_BY_SUFFIX(8UI)

    SET_BY_SUFFIX(16I)
    SET_BY_SUFFIX(16UI)

    SET_BY_SUFFIX(32I)
    SET_BY_SUFFIX(32UI)

#undef SET_BY_SUFFIX

    //////

    SET_COPY_DECAY(    RGB565, R8, RG8, RGB565,      MAX, Luminance8,    MAX,              MAX)
    SET_COPY_DECAY(     RGBA4, R8, RG8, RGB565,    RGBA4, Luminance8, Alpha8, Luminance8Alpha8)
    SET_COPY_DECAY(   RGB5_A1, R8, RG8, RGB565,  RGB5_A1, Luminance8, Alpha8, Luminance8Alpha8)
    SET_COPY_DECAY(  RGB10_A2, R8, RG8,   RGB8, RGB10_A2, Luminance8, Alpha8,              MAX)

    SET_COPY_DECAY(RGB10_A2UI, R8UI, RG8UI, RGB8UI, RGB10_A2UI, MAX, MAX, MAX)

    SET_COPY_DECAY(SRGB8_ALPHA8, MAX, MAX, MAX, SRGB8_ALPHA8, MAX, Alpha8, MAX)

    SET_COPY_DECAY(R11F_G11F_B10F, R16F, RG16F, R11F_G11F_B10F, MAX, Luminance16F, MAX, MAX)

#undef SET_COPY_DECAY
}

//////////////////////////////////////////////////////////////////////////////////////////

bool gAreFormatTablesInitialized = false;

static void
EnsureInitFormatTables(const StaticMutexAutoLock&) // Prove that you locked it!
{
    if (MOZ_LIKELY(gAreFormatTablesInitialized))
        return;

    gAreFormatTablesInitialized = true;

    InitCompressedFormatInfo();
    InitFormatInfo();
}

//////////////////////////////////////////////////////////////////////////////////////////
// Public funcs

StaticMutex gFormatMapMutex;

const FormatInfo*
GetFormat(EffectiveFormat format)
{
    StaticMutexAutoLock lock(gFormatMapMutex);
    EnsureInitFormatTables(lock);

    return GetFormatInfo_NoLock(format);
}

//////////////////////////////////////////////////////////////////////////////////////////

const FormatInfo*
FormatInfo::GetCopyDecayFormat(UnsizedFormat uf) const
{
    return FindOrNull(this->copyDecayFormats, uf);
}

bool
GetBytesPerPixel(const PackingInfo& packing, uint8_t* const out_bytes)
{
    uint8_t bytesPerChannel;

    switch (packing.type) {
    case LOCAL_GL_UNSIGNED_SHORT_4_4_4_4:
    case LOCAL_GL_UNSIGNED_SHORT_5_5_5_1:
    case LOCAL_GL_UNSIGNED_SHORT_5_6_5:
        *out_bytes = 2;
        return true;

    case LOCAL_GL_UNSIGNED_INT_10F_11F_11F_REV:
    case LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV:
    case LOCAL_GL_UNSIGNED_INT_24_8:
    case LOCAL_GL_UNSIGNED_INT_5_9_9_9_REV:
        *out_bytes = 4;
        return true;

    case LOCAL_GL_FLOAT_32_UNSIGNED_INT_24_8_REV:
        *out_bytes = 8;
        return true;

    // Alright, that's all the fixed-size unpackTypes.

    case LOCAL_GL_BYTE:
    case LOCAL_GL_UNSIGNED_BYTE:
        bytesPerChannel = 1;
        break;

    case LOCAL_GL_SHORT:
    case LOCAL_GL_UNSIGNED_SHORT:
    case LOCAL_GL_HALF_FLOAT:
    case LOCAL_GL_HALF_FLOAT_OES:
        bytesPerChannel = 2;
        break;

    case LOCAL_GL_INT:
    case LOCAL_GL_UNSIGNED_INT:
    case LOCAL_GL_FLOAT:
        bytesPerChannel = 4;
        break;

    default:
        return false;
    }

    uint8_t channels;

    switch (packing.format) {
    case LOCAL_GL_RED:
    case LOCAL_GL_RED_INTEGER:
    case LOCAL_GL_LUMINANCE:
    case LOCAL_GL_ALPHA:
    case LOCAL_GL_DEPTH_COMPONENT:
        channels = 1;
        break;

    case LOCAL_GL_RG:
    case LOCAL_GL_RG_INTEGER:
    case LOCAL_GL_LUMINANCE_ALPHA:
        channels = 2;
        break;

    case LOCAL_GL_RGB:
    case LOCAL_GL_RGB_INTEGER:
    case LOCAL_GL_SRGB:
        channels = 3;
        break;

    case LOCAL_GL_BGRA:
    case LOCAL_GL_RGBA:
    case LOCAL_GL_RGBA_INTEGER:
    case LOCAL_GL_SRGB_ALPHA:
        channels = 4;
        break;

    default:
        return false;
    }

    *out_bytes = bytesPerChannel * channels;
    return true;
}

uint8_t
BytesPerPixel(const PackingInfo& packing)
{
    uint8_t ret;
    if (MOZ_LIKELY(GetBytesPerPixel(packing, &ret)))
        return ret;

    gfxCriticalError() << "Bad `packing`: " << gfx::hexa(packing.format) << ", "
                       << gfx::hexa(packing.type);
    MOZ_CRASH("Bad `packing`.");
}

//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////////////////
// FormatUsageAuthority

bool
FormatUsageInfo::IsUnpackValid(const PackingInfo& key,
                               const DriverUnpackInfo** const out_value) const
{
    auto itr = validUnpacks.find(key);
    if (itr == validUnpacks.end())
        return false;

    *out_value = &(itr->second);
    return true;
}

void
FormatUsageInfo::ResolveMaxSamples(gl::GLContext* gl)
{
    MOZ_ASSERT(!this->maxSamplesKnown);
    MOZ_ASSERT(this->maxSamples == 0);
    MOZ_ASSERT(gl->IsCurrent());

    this->maxSamplesKnown = true;

    const GLenum internalFormat = this->format->sizedFormat;
    if (!internalFormat)
        return;

    if (!gl->IsSupported(gl::GLFeature::internalformat_query))
        return; // Leave it at 0.

    GLint maxSamplesGL = 0;
    gl->fGetInternalformativ(LOCAL_GL_RENDERBUFFER, internalFormat, LOCAL_GL_SAMPLES, 1,
                             &maxSamplesGL);

    this->maxSamples = maxSamplesGL;
}

////////////////////////////////////////

static void
AddSimpleUnsized(FormatUsageAuthority* fua, GLenum unpackFormat, GLenum unpackType,
                 EffectiveFormat effFormat)
{
    auto usage = fua->EditUsage(effFormat);
    usage->isFilterable = true;

    const PackingInfo pi = {unpackFormat, unpackType};
    const DriverUnpackInfo dui = {unpackFormat, unpackFormat, unpackType};
    fua->AddTexUnpack(usage, pi, dui);

    fua->AllowUnsizedTexFormat(pi, usage);
};


/*static*/ const GLint FormatUsageInfo::kLuminanceSwizzleRGBA[4] = { LOCAL_GL_RED,
                                                                     LOCAL_GL_RED,
                                                                     LOCAL_GL_RED,
                                                                     LOCAL_GL_ONE };
/*static*/ const GLint FormatUsageInfo::kAlphaSwizzleRGBA[4] = { LOCAL_GL_ZERO,
                                                                 LOCAL_GL_ZERO,
                                                                 LOCAL_GL_ZERO,
                                                                 LOCAL_GL_RED };
/*static*/ const GLint FormatUsageInfo::kLumAlphaSwizzleRGBA[4] = { LOCAL_GL_RED,
                                                                    LOCAL_GL_RED,
                                                                    LOCAL_GL_RED,
                                                                    LOCAL_GL_GREEN };

static bool
AddLegacyFormats_LA8(FormatUsageAuthority* fua, gl::GLContext* gl)
{
    if (gl->IsCoreProfile()) {
        if (!gl->IsSupported(gl::GLFeature::texture_swizzle))
            return false;

        PackingInfo pi;
        DriverUnpackInfo dui;

        const auto fnAdd = [fua, &pi, &dui](EffectiveFormat effFormat,
                                            const GLint* swizzle)
        {
            auto usage = fua->EditUsage(effFormat);
            usage->isFilterable = true;
            usage->textureSwizzleRGBA = swizzle;

            fua->AddTexUnpack(usage, pi, dui);

            fua->AllowUnsizedTexFormat(pi, usage);
        };

        pi = {LOCAL_GL_LUMINANCE, LOCAL_GL_UNSIGNED_BYTE};
        dui = {LOCAL_GL_R8, LOCAL_GL_RED, LOCAL_GL_UNSIGNED_BYTE};
        fnAdd(EffectiveFormat::Luminance8, FormatUsageInfo::kLuminanceSwizzleRGBA);

        pi = {LOCAL_GL_ALPHA, LOCAL_GL_UNSIGNED_BYTE};
        dui = {LOCAL_GL_R8, LOCAL_GL_RED, LOCAL_GL_UNSIGNED_BYTE};
        fnAdd(EffectiveFormat::Alpha8, FormatUsageInfo::kAlphaSwizzleRGBA);

        pi = {LOCAL_GL_LUMINANCE_ALPHA, LOCAL_GL_UNSIGNED_BYTE};
        dui = {LOCAL_GL_RG8, LOCAL_GL_RG, LOCAL_GL_UNSIGNED_BYTE};
        fnAdd(EffectiveFormat::Luminance8Alpha8, FormatUsageInfo::kLumAlphaSwizzleRGBA);
    } else {
        AddSimpleUnsized(fua, LOCAL_GL_LUMINANCE      , LOCAL_GL_UNSIGNED_BYTE, EffectiveFormat::Luminance8      );
        AddSimpleUnsized(fua, LOCAL_GL_ALPHA          , LOCAL_GL_UNSIGNED_BYTE, EffectiveFormat::Alpha8          );
        AddSimpleUnsized(fua, LOCAL_GL_LUMINANCE_ALPHA, LOCAL_GL_UNSIGNED_BYTE, EffectiveFormat::Luminance8Alpha8);
    }

    return true;
}

static bool
AddUnsizedFormats(FormatUsageAuthority* fua, gl::GLContext* gl)
{
    // GLES 2.0.25, p63, Table 3.4
    AddSimpleUnsized(fua, LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE         , EffectiveFormat::RGBA8  );
    AddSimpleUnsized(fua, LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_SHORT_4_4_4_4, EffectiveFormat::RGBA4  );
    AddSimpleUnsized(fua, LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_SHORT_5_5_5_1, EffectiveFormat::RGB5_A1);
    AddSimpleUnsized(fua, LOCAL_GL_RGB , LOCAL_GL_UNSIGNED_BYTE         , EffectiveFormat::RGB8   );
    AddSimpleUnsized(fua, LOCAL_GL_RGB , LOCAL_GL_UNSIGNED_SHORT_5_6_5  , EffectiveFormat::RGB565 );

    // L, A, LA
    return AddLegacyFormats_LA8(fua, gl);
}

void
FormatUsageInfo::SetRenderable()
{
    this->isRenderable = true;

#ifdef DEBUG
    const auto format = this->format;
    if (format->IsColorFormat()) {
        const auto& map = format->copyDecayFormats;
        const auto itr = map.find(format->unsizedFormat);
        MOZ_ASSERT(itr != map.end(), "Renderable formats must be in copyDecayFormats.");
        MOZ_ASSERT(itr->second == format);
    }
#endif
}

UniquePtr<FormatUsageAuthority>
FormatUsageAuthority::CreateForWebGL1(gl::GLContext* gl)
{
    UniquePtr<FormatUsageAuthority> ret(new FormatUsageAuthority);
    const auto ptr = ret.get();

    ////////////////////////////////////////////////////////////////////////////
    // Usages

    const auto fnSet = [ptr](EffectiveFormat effFormat, bool isRenderable,
                             bool isFilterable)
    {
        MOZ_ASSERT(!ptr->GetUsage(effFormat));

        auto usage = ptr->EditUsage(effFormat);
        usage->isFilterable = isFilterable;

        if (isRenderable) {
            usage->SetRenderable();
        }
    };

    // GLES 2.0.25, p117, Table 4.5
    // RGBA8 is made renderable in WebGL 1.0, "Framebuffer Object Attachments"
    //                              render filter
    //                              able   able
    fnSet(EffectiveFormat::RGBA8  , true, true);
    fnSet(EffectiveFormat::RGBA4  , true, true);
    fnSet(EffectiveFormat::RGB5_A1, true, true);
    fnSet(EffectiveFormat::RGB565 , true, true);

    // RGB8 is not guaranteed to be renderable, but we should allow it for web-compat.
    // Min-capability mode should mark this as non-renderable.
    fnSet(EffectiveFormat::RGB8, true, true);

    fnSet(EffectiveFormat::Luminance8Alpha8, false, true);
    fnSet(EffectiveFormat::Luminance8      , false, true);
    fnSet(EffectiveFormat::Alpha8          , false, true);

    fnSet(EffectiveFormat::DEPTH_COMPONENT16, true, false);
    fnSet(EffectiveFormat::STENCIL_INDEX8   , true, false);

    // Added in WebGL 1.0 spec:
    fnSet(EffectiveFormat::DEPTH24_STENCIL8, true, false);

    ////////////////////////////////////
    // RB formats

#define FOO(x) ptr->AllowRBFormat(LOCAL_GL_ ## x, ptr->GetUsage(EffectiveFormat::x))

    FOO(RGBA4            );
    FOO(RGB5_A1          );
    FOO(RGB565           );
    FOO(DEPTH_COMPONENT16);
    FOO(STENCIL_INDEX8   );
    //FOO(DEPTH24_STENCIL8 ); // WebGL 1 uses DEPTH_STENCIL instead of DEPTH24_STENCIL8.

#undef FOO

    ptr->AllowRBFormat(LOCAL_GL_DEPTH_STENCIL,
                       ptr->GetUsage(EffectiveFormat::DEPTH24_STENCIL8));

    ////////////////////////////////////////////////////////////////////////////

    if (!AddUnsizedFormats(ptr, gl))
        return nullptr;

    return Move(ret);
}

UniquePtr<FormatUsageAuthority>
FormatUsageAuthority::CreateForWebGL2(gl::GLContext* gl)
{
    UniquePtr<FormatUsageAuthority> ret(new FormatUsageAuthority);
    const auto ptr = ret.get();

    ////////////////////////////////////////////////////////////////////////////
    // GLES 3.0.4 p111-113

    const auto fnAddSizedUnpack = [ptr](EffectiveFormat effFormat, GLenum internalFormat,
                                        GLenum unpackFormat, GLenum unpackType)
    {
        auto usage = ptr->EditUsage(effFormat);

        const PackingInfo pi = {unpackFormat, unpackType};
        const DriverUnpackInfo dui = {internalFormat, unpackFormat, unpackType};
        ptr->AddTexUnpack(usage, pi, dui);
    };

#define FOO(x) EffectiveFormat::x, LOCAL_GL_ ## x

    // RGBA
    fnAddSizedUnpack(FOO(RGBA8       ), LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE              );
    fnAddSizedUnpack(FOO(RGBA4       ), LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_SHORT_4_4_4_4     );
    fnAddSizedUnpack(FOO(RGBA4       ), LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE              );
    fnAddSizedUnpack(FOO(RGB5_A1     ), LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_SHORT_5_5_5_1     );
    fnAddSizedUnpack(FOO(RGB5_A1     ), LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE              );
    fnAddSizedUnpack(FOO(RGB5_A1     ), LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV);
    fnAddSizedUnpack(FOO(SRGB8_ALPHA8), LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_BYTE              );
    fnAddSizedUnpack(FOO(RGBA8_SNORM ), LOCAL_GL_RGBA, LOCAL_GL_BYTE                       );
    fnAddSizedUnpack(FOO(RGB10_A2    ), LOCAL_GL_RGBA, LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV);
    fnAddSizedUnpack(FOO(RGBA16F     ), LOCAL_GL_RGBA, LOCAL_GL_HALF_FLOAT                 );
    fnAddSizedUnpack(FOO(RGBA16F     ), LOCAL_GL_RGBA, LOCAL_GL_FLOAT                      );
    fnAddSizedUnpack(FOO(RGBA32F     ), LOCAL_GL_RGBA, LOCAL_GL_FLOAT                      );

    // RGBA_INTEGER
    fnAddSizedUnpack(FOO(RGBA8UI   ), LOCAL_GL_RGBA_INTEGER, LOCAL_GL_UNSIGNED_BYTE              );
    fnAddSizedUnpack(FOO(RGBA8I    ), LOCAL_GL_RGBA_INTEGER, LOCAL_GL_BYTE                       );
    fnAddSizedUnpack(FOO(RGBA16UI  ), LOCAL_GL_RGBA_INTEGER, LOCAL_GL_UNSIGNED_SHORT             );
    fnAddSizedUnpack(FOO(RGBA16I   ), LOCAL_GL_RGBA_INTEGER, LOCAL_GL_SHORT                      );
    fnAddSizedUnpack(FOO(RGBA32UI  ), LOCAL_GL_RGBA_INTEGER, LOCAL_GL_UNSIGNED_INT               );
    fnAddSizedUnpack(FOO(RGBA32I   ), LOCAL_GL_RGBA_INTEGER, LOCAL_GL_INT                        );
    fnAddSizedUnpack(FOO(RGB10_A2UI), LOCAL_GL_RGBA_INTEGER, LOCAL_GL_UNSIGNED_INT_2_10_10_10_REV);

    // RGB
    fnAddSizedUnpack(FOO(RGB8          ), LOCAL_GL_RGB, LOCAL_GL_UNSIGNED_BYTE               );
    fnAddSizedUnpack(FOO(SRGB8         ), LOCAL_GL_RGB, LOCAL_GL_UNSIGNED_BYTE               );
    fnAddSizedUnpack(FOO(RGB565        ), LOCAL_GL_RGB, LOCAL_GL_UNSIGNED_SHORT_5_6_5        );
    fnAddSizedUnpack(FOO(RGB565        ), LOCAL_GL_RGB, LOCAL_GL_UNSIGNED_BYTE               );
    fnAddSizedUnpack(FOO(RGB8_SNORM    ), LOCAL_GL_RGB, LOCAL_GL_BYTE                        );
    fnAddSizedUnpack(FOO(R11F_G11F_B10F), LOCAL_GL_RGB, LOCAL_GL_UNSIGNED_INT_10F_11F_11F_REV);
    fnAddSizedUnpack(FOO(R11F_G11F_B10F), LOCAL_GL_RGB, LOCAL_GL_HALF_FLOAT                  );
    fnAddSizedUnpack(FOO(R11F_G11F_B10F), LOCAL_GL_RGB, LOCAL_GL_FLOAT                       );
    fnAddSizedUnpack(FOO(RGB16F        ), LOCAL_GL_RGB, LOCAL_GL_HALF_FLOAT                  );
    fnAddSizedUnpack(FOO(RGB16F        ), LOCAL_GL_RGB, LOCAL_GL_FLOAT                       );
    fnAddSizedUnpack(FOO(RGB9_E5       ), LOCAL_GL_RGB, LOCAL_GL_UNSIGNED_INT_5_9_9_9_REV    );
    fnAddSizedUnpack(FOO(RGB9_E5       ), LOCAL_GL_RGB, LOCAL_GL_HALF_FLOAT                  );
    fnAddSizedUnpack(FOO(RGB9_E5       ), LOCAL_GL_RGB, LOCAL_GL_FLOAT                       );
    fnAddSizedUnpack(FOO(RGB32F        ), LOCAL_GL_RGB, LOCAL_GL_FLOAT                       );

    // RGB_INTEGER
    fnAddSizedUnpack(FOO(RGB8UI ), LOCAL_GL_RGB_INTEGER, LOCAL_GL_UNSIGNED_BYTE );
    fnAddSizedUnpack(FOO(RGB8I  ), LOCAL_GL_RGB_INTEGER, LOCAL_GL_BYTE          );
    fnAddSizedUnpack(FOO(RGB16UI), LOCAL_GL_RGB_INTEGER, LOCAL_GL_UNSIGNED_SHORT);
    fnAddSizedUnpack(FOO(RGB16I ), LOCAL_GL_RGB_INTEGER, LOCAL_GL_SHORT         );
    fnAddSizedUnpack(FOO(RGB32UI), LOCAL_GL_RGB_INTEGER, LOCAL_GL_UNSIGNED_INT  );
    fnAddSizedUnpack(FOO(RGB32I ), LOCAL_GL_RGB_INTEGER, LOCAL_GL_INT           );

    // RG
    fnAddSizedUnpack(FOO(RG8      ), LOCAL_GL_RG, LOCAL_GL_UNSIGNED_BYTE);
    fnAddSizedUnpack(FOO(RG8_SNORM), LOCAL_GL_RG, LOCAL_GL_BYTE         );
    fnAddSizedUnpack(FOO(RG16F    ), LOCAL_GL_RG, LOCAL_GL_HALF_FLOAT   );
    fnAddSizedUnpack(FOO(RG16F    ), LOCAL_GL_RG, LOCAL_GL_FLOAT        );
    fnAddSizedUnpack(FOO(RG32F    ), LOCAL_GL_RG, LOCAL_GL_FLOAT        );

    // RG_INTEGER
    fnAddSizedUnpack(FOO(RG8UI ), LOCAL_GL_RG_INTEGER, LOCAL_GL_UNSIGNED_BYTE );
    fnAddSizedUnpack(FOO(RG8I  ), LOCAL_GL_RG_INTEGER, LOCAL_GL_BYTE          );
    fnAddSizedUnpack(FOO(RG16UI), LOCAL_GL_RG_INTEGER, LOCAL_GL_UNSIGNED_SHORT);
    fnAddSizedUnpack(FOO(RG16I ), LOCAL_GL_RG_INTEGER, LOCAL_GL_SHORT         );
    fnAddSizedUnpack(FOO(RG32UI), LOCAL_GL_RG_INTEGER, LOCAL_GL_UNSIGNED_INT  );
    fnAddSizedUnpack(FOO(RG32I ), LOCAL_GL_RG_INTEGER, LOCAL_GL_INT           );

    // RED
    fnAddSizedUnpack(FOO(R8      ), LOCAL_GL_RED, LOCAL_GL_UNSIGNED_BYTE);
    fnAddSizedUnpack(FOO(R8_SNORM), LOCAL_GL_RED, LOCAL_GL_BYTE         );
    fnAddSizedUnpack(FOO(R16F    ), LOCAL_GL_RED, LOCAL_GL_HALF_FLOAT   );
    fnAddSizedUnpack(FOO(R16F    ), LOCAL_GL_RED, LOCAL_GL_FLOAT        );
    fnAddSizedUnpack(FOO(R32F    ), LOCAL_GL_RED, LOCAL_GL_FLOAT        );

    // RED_INTEGER
    fnAddSizedUnpack(FOO(R8UI ), LOCAL_GL_RED_INTEGER, LOCAL_GL_UNSIGNED_BYTE );
    fnAddSizedUnpack(FOO(R8I  ), LOCAL_GL_RED_INTEGER, LOCAL_GL_BYTE          );
    fnAddSizedUnpack(FOO(R16UI), LOCAL_GL_RED_INTEGER, LOCAL_GL_UNSIGNED_SHORT);
    fnAddSizedUnpack(FOO(R16I ), LOCAL_GL_RED_INTEGER, LOCAL_GL_SHORT         );
    fnAddSizedUnpack(FOO(R32UI), LOCAL_GL_RED_INTEGER, LOCAL_GL_UNSIGNED_INT  );
    fnAddSizedUnpack(FOO(R32I ), LOCAL_GL_RED_INTEGER, LOCAL_GL_INT           );

    // DEPTH_COMPONENT
    fnAddSizedUnpack(FOO(DEPTH_COMPONENT16 ), LOCAL_GL_DEPTH_COMPONENT, LOCAL_GL_UNSIGNED_SHORT);
    fnAddSizedUnpack(FOO(DEPTH_COMPONENT16 ), LOCAL_GL_DEPTH_COMPONENT, LOCAL_GL_UNSIGNED_INT  );
    fnAddSizedUnpack(FOO(DEPTH_COMPONENT24 ), LOCAL_GL_DEPTH_COMPONENT, LOCAL_GL_UNSIGNED_INT  );
    fnAddSizedUnpack(FOO(DEPTH_COMPONENT32F), LOCAL_GL_DEPTH_COMPONENT, LOCAL_GL_FLOAT         );

    // DEPTH_STENCIL
    fnAddSizedUnpack(FOO(DEPTH24_STENCIL8 ), LOCAL_GL_DEPTH_STENCIL, LOCAL_GL_UNSIGNED_INT_24_8             );
    fnAddSizedUnpack(FOO(DEPTH32F_STENCIL8), LOCAL_GL_DEPTH_STENCIL, LOCAL_GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

#undef FOO

    ////////////////////////////////////////////////////////////////////////////

    // For renderable, see GLES 3.0.4, p212 "Framebuffer Completeness"
    // For filterable, see GLES 3.0.4, p161 "...a texture is complete unless..."

    const auto fnAllowES3TexFormat = [ptr](GLenum sizedFormat, EffectiveFormat effFormat,
                                           bool isRenderable, bool isFilterable)
    {
        auto usage = ptr->EditUsage(effFormat);
        usage->isFilterable = isFilterable;

        if (isRenderable) {
            usage->SetRenderable();
        }

        ptr->AllowSizedTexFormat(sizedFormat, usage);

        if (isRenderable) {
            ptr->AllowRBFormat(sizedFormat, usage);
        }
    };

#define FOO(x) LOCAL_GL_ ## x, EffectiveFormat::x

    // GLES 3.0.4, p128-129 "Required Texture Formats"
    // GLES 3.0.4, p130-132, table 3.13
    //                                   render filter
    //                                    able   able
    fnAllowES3TexFormat(FOO(R8         ), true , true );
    fnAllowES3TexFormat(FOO(R8_SNORM   ), false, true );
    fnAllowES3TexFormat(FOO(RG8        ), true , true );
    fnAllowES3TexFormat(FOO(RG8_SNORM  ), false, true );
    fnAllowES3TexFormat(FOO(RGB8       ), true , true );
    fnAllowES3TexFormat(FOO(RGB8_SNORM ), false, true );
    fnAllowES3TexFormat(FOO(RGB565     ), true , true );
    fnAllowES3TexFormat(FOO(RGBA4      ), true , true );
    fnAllowES3TexFormat(FOO(RGB5_A1    ), true , true );
    fnAllowES3TexFormat(FOO(RGBA8      ), true , true );
    fnAllowES3TexFormat(FOO(RGBA8_SNORM), false, true );
    fnAllowES3TexFormat(FOO(RGB10_A2   ), true , true );
    fnAllowES3TexFormat(FOO(RGB10_A2UI ), true , false);

    fnAllowES3TexFormat(FOO(SRGB8       ), false, true);
    fnAllowES3TexFormat(FOO(SRGB8_ALPHA8), true , true);

    fnAllowES3TexFormat(FOO(R16F   ), false, true);
    fnAllowES3TexFormat(FOO(RG16F  ), false, true);
    fnAllowES3TexFormat(FOO(RGB16F ), false, true);
    fnAllowES3TexFormat(FOO(RGBA16F), false, true);

    fnAllowES3TexFormat(FOO(R32F   ), false, false);
    fnAllowES3TexFormat(FOO(RG32F  ), false, false);
    fnAllowES3TexFormat(FOO(RGB32F ), false, false);
    fnAllowES3TexFormat(FOO(RGBA32F), false, false);

    fnAllowES3TexFormat(FOO(R11F_G11F_B10F), false, true);
    fnAllowES3TexFormat(FOO(RGB9_E5       ), false, true);

    fnAllowES3TexFormat(FOO(R8I  ), true, false);
    fnAllowES3TexFormat(FOO(R8UI ), true, false);
    fnAllowES3TexFormat(FOO(R16I ), true, false);
    fnAllowES3TexFormat(FOO(R16UI), true, false);
    fnAllowES3TexFormat(FOO(R32I ), true, false);
    fnAllowES3TexFormat(FOO(R32UI), true, false);

    fnAllowES3TexFormat(FOO(RG8I  ), true, false);
    fnAllowES3TexFormat(FOO(RG8UI ), true, false);
    fnAllowES3TexFormat(FOO(RG16I ), true, false);
    fnAllowES3TexFormat(FOO(RG16UI), true, false);
    fnAllowES3TexFormat(FOO(RG32I ), true, false);
    fnAllowES3TexFormat(FOO(RG32UI), true, false);

    fnAllowES3TexFormat(FOO(RGB8I  ), false, false);
    fnAllowES3TexFormat(FOO(RGB8UI ), false, false);
    fnAllowES3TexFormat(FOO(RGB16I ), false, false);
    fnAllowES3TexFormat(FOO(RGB16UI), false, false);
    fnAllowES3TexFormat(FOO(RGB32I ), false, false);
    fnAllowES3TexFormat(FOO(RGB32UI), false, false);

    fnAllowES3TexFormat(FOO(RGBA8I  ), true, false);
    fnAllowES3TexFormat(FOO(RGBA8UI ), true, false);
    fnAllowES3TexFormat(FOO(RGBA16I ), true, false);
    fnAllowES3TexFormat(FOO(RGBA16UI), true, false);
    fnAllowES3TexFormat(FOO(RGBA32I ), true, false);
    fnAllowES3TexFormat(FOO(RGBA32UI), true, false);

    // GLES 3.0.4, p133, table 3.14
    fnAllowES3TexFormat(FOO(DEPTH_COMPONENT16 ), true, false);
    fnAllowES3TexFormat(FOO(DEPTH_COMPONENT24 ), true, false);
    fnAllowES3TexFormat(FOO(DEPTH_COMPONENT32F), true, false);
    fnAllowES3TexFormat(FOO(DEPTH24_STENCIL8  ), true, false);
    fnAllowES3TexFormat(FOO(DEPTH32F_STENCIL8 ), true, false);

#undef FOO

    // GLES 3.0.4, p206, "Required Renderbuffer Formats":
    // "Implementations are also required to support STENCIL_INDEX8. Requesting this
    //  internal format for a renderbuffer will allocate at least 8 stencil bit planes."

    auto usage = ptr->EditUsage(EffectiveFormat::STENCIL_INDEX8);
    usage->SetRenderable();
    ptr->AllowRBFormat(LOCAL_GL_STENCIL_INDEX8, usage);

    ////////////////
    // Legacy formats

    if (!AddUnsizedFormats(ptr, gl))
        return nullptr;

    ptr->AllowRBFormat(LOCAL_GL_DEPTH_STENCIL,
                       ptr->GetUsage(EffectiveFormat::DEPTH24_STENCIL8));

    if (gfxPrefs::WebGL2CompatMode()) {
        AddSimpleUnsized(ptr, LOCAL_GL_RGBA, LOCAL_GL_FLOAT, EffectiveFormat::RGBA32F);
        AddSimpleUnsized(ptr, LOCAL_GL_RGB , LOCAL_GL_FLOAT, EffectiveFormat::RGB32F );

        AddSimpleUnsized(ptr, LOCAL_GL_RGBA, LOCAL_GL_HALF_FLOAT_OES, EffectiveFormat::RGBA16F);
        AddSimpleUnsized(ptr, LOCAL_GL_RGB , LOCAL_GL_HALF_FLOAT_OES, EffectiveFormat::RGB16F );
    }

    ////////////////////////////////////

    return Move(ret);
}

//////////////////////////////////////////////////////////////////////////////////////////

void
FormatUsageAuthority::AddTexUnpack(FormatUsageInfo* usage, const PackingInfo& pi,
                                   const DriverUnpackInfo& dui)
{
    // Don't AlwaysInsert here, since we'll see duplicates from sized and unsized formats.
    auto res = usage->validUnpacks.insert({ pi, dui });
    auto itr = res.first;

    if (!usage->idealUnpack) {
        // First one!
        usage->idealUnpack = &(itr->second);
    }

    mValidTexUnpackFormats.insert(pi.format);
    mValidTexUnpackTypes.insert(pi.type);
}

static bool
Contains(const std::set<GLenum>& set, GLenum key)
{
    return set.find(key) != set.end();
}

bool
FormatUsageAuthority::IsInternalFormatEnumValid(GLenum internalFormat) const
{
    return Contains(mValidTexInternalFormats, internalFormat);
}

bool
FormatUsageAuthority::AreUnpackEnumsValid(GLenum unpackFormat, GLenum unpackType) const
{
    return (Contains(mValidTexUnpackFormats, unpackFormat) &&
            Contains(mValidTexUnpackTypes, unpackType));
}

////////////////////

void
FormatUsageAuthority::AllowRBFormat(GLenum sizedFormat, const FormatUsageInfo* usage)
{
    MOZ_ASSERT(!usage->format->compression);
    MOZ_ASSERT(usage->format->sizedFormat);
    MOZ_ASSERT(usage->IsRenderable());

    AlwaysInsert(mRBFormatMap, sizedFormat, usage);
}

void
FormatUsageAuthority::AllowSizedTexFormat(GLenum sizedFormat,
                                          const FormatUsageInfo* usage)
{
    if (usage->format->compression) {
        MOZ_ASSERT(usage->isFilterable, "Compressed formats should be filterable.");
    } else {
        MOZ_ASSERT(usage->validUnpacks.size() && usage->idealUnpack,
                   "AddTexUnpack() first.");
    }

    AlwaysInsert(mSizedTexFormatMap, sizedFormat, usage);

    mValidTexInternalFormats.insert(sizedFormat);
}

void
FormatUsageAuthority::AllowUnsizedTexFormat(const PackingInfo& pi,
                                            const FormatUsageInfo* usage)
{
    MOZ_ASSERT(!usage->format->compression);
    MOZ_ASSERT(usage->validUnpacks.size() && usage->idealUnpack, "AddTexUnpack() first.");

    AlwaysInsert(mUnsizedTexFormatMap, pi, usage);

    mValidTexInternalFormats.insert(pi.format);
    mValidTexUnpackFormats.insert(pi.format);
    mValidTexUnpackTypes.insert(pi.type);
}

const FormatUsageInfo*
FormatUsageAuthority::GetRBUsage(GLenum sizedFormat) const
{
    return FindOrNull(mRBFormatMap, sizedFormat);
}

const FormatUsageInfo*
FormatUsageAuthority::GetSizedTexUsage(GLenum sizedFormat) const
{
    return FindOrNull(mSizedTexFormatMap, sizedFormat);
}

const FormatUsageInfo*
FormatUsageAuthority::GetUnsizedTexUsage(const PackingInfo& pi) const
{
    return FindOrNull(mUnsizedTexFormatMap, pi);
}

FormatUsageInfo*
FormatUsageAuthority::EditUsage(EffectiveFormat format)
{
    auto itr = mUsageMap.find(format);

    if (itr == mUsageMap.end()) {
        const FormatInfo* formatInfo = GetFormat(format);
        MOZ_RELEASE_ASSERT(formatInfo, "GFX: no format info set.");

        FormatUsageInfo usage(formatInfo);

        auto res = mUsageMap.insert({ format, usage });
        DebugOnly<bool> didInsert = res.second;
        MOZ_ASSERT(didInsert);

        itr = res.first;
    }

    return &(itr->second);
}

const FormatUsageInfo*
FormatUsageAuthority::GetUsage(EffectiveFormat format) const
{
    auto itr = mUsageMap.find(format);
    if (itr == mUsageMap.end())
        return nullptr;

    return &(itr->second);
}

////////////////////////////////////////////////////////////////////////////////

} // namespace webgl
} // namespace mozilla