forked from BinomialLLC/basis_universal
-
Notifications
You must be signed in to change notification settings - Fork 0
/
basisu_backend.cpp
1674 lines (1295 loc) · 58.7 KB
/
basisu_backend.cpp
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
// basisu_backend.cpp
// Copyright (C) 2019 Binomial LLC. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// TODO: This code originally supported full ETC1 and ETC1S, so there's some legacy stuff in here.
//
#include "basisu_backend.h"
#define BASISU_FASTER_SELECTOR_REORDERING 0
#define BASISU_BACKEND_VERIFY(c) verify(c, __LINE__);
namespace basisu
{
// TODO
static inline void verify(bool condition, int line)
{
if (!condition)
{
fprintf(stderr, "ERROR: basisu_backend: verify() failed at line %i!\n", line);
abort();
}
}
basisu_backend::basisu_backend()
{
clear();
}
void basisu_backend::clear()
{
m_pFront_end = NULL;
m_params.clear();
m_output.clear();
}
void basisu_backend::init(basisu_frontend* pFront_end, basisu_backend_params& params, const basisu_backend_slice_desc_vec& slice_descs, const basist::etc1_global_selector_codebook* pGlobal_sel_codebook)
{
m_pFront_end = pFront_end;
m_params = params;
m_slices = slice_descs;
m_pGlobal_sel_codebook = pGlobal_sel_codebook;
debug_printf("basisu_backend::Init: Slices: %u, ETC1S: %u, EndpointRDOQualityThresh: %f, SelectorRDOQualityThresh: %f, UseGlobalSelCodebook: %u, GlobalSelCodebookPalBits: %u, GlobalSelCodebookModBits: %u, Use hybrid selector codebooks: %u\n",
m_slices.size(),
params.m_etc1s,
params.m_endpoint_rdo_quality_thresh,
params.m_selector_rdo_quality_thresh,
params.m_use_global_sel_codebook,
params.m_global_sel_codebook_pal_bits,
params.m_global_sel_codebook_mod_bits,
params.m_use_hybrid_sel_codebooks);
debug_printf("Frontend endpoints: %u selectors: %u\n", m_pFront_end->get_total_endpoint_clusters(), m_pFront_end->get_total_selector_clusters());
for (uint32_t i = 0; i < m_slices.size(); i++)
{
debug_printf("Slice: %u, OrigWidth: %u, OrigHeight: %u, Width: %u, Height: %u, NumBlocksX: %u, NumBlocksY: %u, FirstBlockIndex: %u\n",
i,
m_slices[i].m_orig_width, m_slices[i].m_orig_height,
m_slices[i].m_width, m_slices[i].m_height,
m_slices[i].m_num_blocks_x, m_slices[i].m_num_blocks_y,
m_slices[i].m_first_block_index);
}
}
void basisu_backend::create_endpoint_palette()
{
const basisu_frontend& r = *m_pFront_end;
m_output.m_num_endpoints = r.get_total_endpoint_clusters();
m_endpoint_palette.resize(r.get_total_endpoint_clusters());
for (uint32_t i = 0; i < r.get_total_endpoint_clusters(); i++)
{
etc1_endpoint_palette_entry& e = m_endpoint_palette[i];
e.m_color5_valid = r.get_endpoint_cluster_color_is_used(i, false);
e.m_color5 = r.get_endpoint_cluster_unscaled_color(i, false);
e.m_inten5 = r.get_endpoint_cluster_inten_table(i, false);
BASISU_BACKEND_VERIFY(e.m_color5_valid);
}
}
void basisu_backend::create_selector_palette()
{
const basisu_frontend& r = *m_pFront_end;
m_output.m_num_selectors = r.get_total_selector_clusters();
m_selector_palette.resize(r.get_total_selector_clusters());
if (m_params.m_use_global_sel_codebook)
{
m_global_selector_palette_desc.resize(r.get_total_selector_clusters());
for (int i = 0; i < static_cast<int>(r.get_total_selector_clusters()); i++)
{
basist::etc1_selector_palette_entry& selector_pal_entry = m_selector_palette[i];
etc1_global_selector_cb_entry_desc& pal_entry_desc = m_global_selector_palette_desc[i];
pal_entry_desc.m_pal_index = r.get_selector_cluster_global_selector_entry_ids()[i].m_palette_index;
pal_entry_desc.m_mod_index = r.get_selector_cluster_global_selector_entry_ids()[i].m_modifier.get_index();
pal_entry_desc.m_was_used = true;
if (m_params.m_use_hybrid_sel_codebooks)
pal_entry_desc.m_was_used = r.get_selector_cluster_uses_global_cb_vec()[i];
if (pal_entry_desc.m_was_used)
{
const etc_block& selector_bits = r.get_selector_cluster_selector_bits(i);
(void)selector_bits;
basist::etc1_selector_palette_entry global_pal_entry(m_pGlobal_sel_codebook->get_entry(r.get_selector_cluster_global_selector_entry_ids()[i]));
for (uint32_t y = 0; y < 4; y++)
{
for (uint32_t x = 0; x < 4; x++)
{
selector_pal_entry(x, y) = global_pal_entry(x, y);
assert(selector_bits.get_selector(x, y) == global_pal_entry(x, y));
}
}
}
else
{
const etc_block& selector_bits = r.get_selector_cluster_selector_bits(i);
for (uint32_t y = 0; y < 4; y++)
for (uint32_t x = 0; x < 4; x++)
selector_pal_entry[y * 4 + x] = static_cast<uint8_t>(selector_bits.get_selector(x, y));
}
}
}
else
{
for (uint32_t i = 0; i < r.get_total_selector_clusters(); i++)
{
basist::etc1_selector_palette_entry& s = m_selector_palette[i];
const etc_block& selector_bits = r.get_selector_cluster_selector_bits(i);
for (uint32_t y = 0; y < 4; y++)
{
for (uint32_t x = 0; x < 4; x++)
{
s[y * 4 + x] = static_cast<uint8_t>(selector_bits.get_selector(x, y));
}
}
}
}
}
static const struct
{
int8_t m_dx, m_dy;
} g_endpoint_preds[] =
{
{ -1, 0 },
{ 0, -1 },
{ -1, -1 }
};
void basisu_backend::reoptimize_and_sort_endpoints_codebook(uint32_t total_block_endpoints_remapped, uint_vec& all_endpoint_indices)
{
basisu_frontend& r = *m_pFront_end;
const bool is_video = r.get_params().m_tex_type == basist::cBASISTexTypeVideoFrames;
if ((total_block_endpoints_remapped) && (m_params.m_compression_level > 0))
{
// We're changed the block endpoint indices, so we need to go and adjust the endpoint codebook (remove unused entries, optimize existing entries that have changed)
uint_vec new_block_endpoints(get_total_blocks());
for (uint32_t slice_index = 0; slice_index < m_slices.size(); slice_index++)
{
const uint32_t first_block_index = m_slices[slice_index].m_first_block_index;
const uint32_t num_blocks_x = m_slices[slice_index].m_num_blocks_x;
const uint32_t num_blocks_y = m_slices[slice_index].m_num_blocks_y;
for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
new_block_endpoints[first_block_index + block_x + block_y * num_blocks_x] = m_slice_encoder_blocks[slice_index](block_x, block_y).m_endpoint_index;
}
int_vec old_to_new_endpoint_indices;
r.reoptimize_remapped_endpoints(new_block_endpoints, old_to_new_endpoint_indices, true);
create_endpoint_palette();
for (uint32_t slice_index = 0; slice_index < m_slices.size(); slice_index++)
{
const uint32_t first_block_index = m_slices[slice_index].m_first_block_index;
const uint32_t width = m_slices[slice_index].m_width;
const uint32_t height = m_slices[slice_index].m_height;
const uint32_t num_blocks_x = m_slices[slice_index].m_num_blocks_x;
const uint32_t num_blocks_y = m_slices[slice_index].m_num_blocks_y;
for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
{
for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
{
const uint32_t block_index = first_block_index + block_x + block_y * num_blocks_x;
encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);
m.m_endpoint_index = old_to_new_endpoint_indices[m.m_endpoint_index];
} // block_x
} // block_y
} // slice_index
for (uint32_t i = 0; i < all_endpoint_indices.size(); i++)
all_endpoint_indices[i] = old_to_new_endpoint_indices[all_endpoint_indices[i]];
} //if (total_block_endpoints_remapped)
// Sort endpoint codebook
palette_index_reorderer reorderer;
reorderer.init((uint32_t)all_endpoint_indices.size(), &all_endpoint_indices[0], r.get_total_endpoint_clusters(), nullptr, nullptr, 0);
m_endpoint_remap_table_old_to_new = reorderer.get_remap_table();
m_endpoint_remap_table_new_to_old.resize(r.get_total_endpoint_clusters());
for (uint32_t i = 0; i < m_endpoint_remap_table_old_to_new.size(); i++)
m_endpoint_remap_table_new_to_old[m_endpoint_remap_table_old_to_new[i]] = i;
}
void basisu_backend::sort_selector_codebook()
{
basisu_frontend& r = *m_pFront_end;
m_selector_remap_table_new_to_old.resize(r.get_total_selector_clusters());
if (m_params.m_compression_level == 0)
{
for (uint32_t i = 0; i < r.get_total_selector_clusters(); i++)
m_selector_remap_table_new_to_old[i] = i;
}
else
{
m_selector_remap_table_new_to_old[0] = 0;
uint32_t prev_selector_index = 0;
int_vec remaining_selectors;
remaining_selectors.reserve(r.get_total_selector_clusters() - 1);
for (uint32_t i = 1; i < r.get_total_selector_clusters(); i++)
remaining_selectors.push_back(i);
uint_vec selector_palette_bytes(m_selector_palette.size());
for (uint32_t i = 0; i < m_selector_palette.size(); i++)
selector_palette_bytes[i] = m_selector_palette[i].get_byte(0) | (m_selector_palette[i].get_byte(1) << 8) | (m_selector_palette[i].get_byte(2) << 16) | (m_selector_palette[i].get_byte(3) << 24);
// This is the traveling salesman problem.
for (uint32_t i = 1; i < r.get_total_selector_clusters(); i++)
{
uint32_t best_hamming_dist = 100;
uint32_t best_index = 0;
#if BASISU_FASTER_SELECTOR_REORDERING
const uint32_t step = (remaining_selectors.size() > 16) ? 16 : 1;
for (uint32_t j = 0; j < remaining_selectors.size(); j += step)
#else
for (uint32_t j = 0; j < remaining_selectors.size(); j++)
#endif
{
int selector_index = remaining_selectors[j];
uint32_t k = selector_palette_bytes[prev_selector_index] ^ selector_palette_bytes[selector_index];
uint32_t hamming_dist = g_hamming_dist[k & 0xFF] + g_hamming_dist[(k >> 8) & 0xFF] + g_hamming_dist[(k >> 16) & 0xFF] + g_hamming_dist[k >> 24];
if (hamming_dist < best_hamming_dist)
{
best_hamming_dist = hamming_dist;
best_index = j;
if (best_hamming_dist <= 1)
break;
}
}
prev_selector_index = remaining_selectors[best_index];
m_selector_remap_table_new_to_old[i] = prev_selector_index;
remaining_selectors[best_index] = remaining_selectors.back();
remaining_selectors.resize(remaining_selectors.size() - 1);
}
}
m_selector_remap_table_old_to_new.resize(r.get_total_selector_clusters());
for (uint32_t i = 0; i < m_selector_remap_table_new_to_old.size(); i++)
m_selector_remap_table_old_to_new[m_selector_remap_table_new_to_old[i]] = i;
}
int basisu_backend::find_video_frame(int slice_index, int delta)
{
for (uint32_t s = 0; s < m_slices.size(); s++)
{
if ((int)m_slices[s].m_source_file_index != ((int)m_slices[slice_index].m_source_file_index + delta))
continue;
if (m_slices[s].m_mip_index != m_slices[slice_index].m_mip_index)
continue;
// Being super paranoid here.
if (m_slices[s].m_num_blocks_x != (m_slices[slice_index].m_num_blocks_x))
continue;
if (m_slices[s].m_num_blocks_y != (m_slices[slice_index].m_num_blocks_y))
continue;
if (m_slices[s].m_alpha != (m_slices[slice_index].m_alpha))
continue;
return s;
}
return -1;
}
void basisu_backend::check_for_valid_cr_blocks()
{
basisu_frontend& r = *m_pFront_end;
const bool is_video = r.get_params().m_tex_type == basist::cBASISTexTypeVideoFrames;
if (!is_video)
return;
uint32_t total_crs = 0;
uint32_t total_invalid_crs = 0;
for (uint32_t slice_index = 0; slice_index < m_slices.size(); slice_index++)
{
const bool is_iframe = m_slices[slice_index].m_iframe;
const uint32_t first_block_index = m_slices[slice_index].m_first_block_index;
const uint32_t width = m_slices[slice_index].m_width;
const uint32_t height = m_slices[slice_index].m_height;
const uint32_t num_blocks_x = m_slices[slice_index].m_num_blocks_x;
const uint32_t num_blocks_y = m_slices[slice_index].m_num_blocks_y;
const int prev_frame_slice_index = find_video_frame(slice_index, -1);
// If we don't have a previous frame, and we're not an i-frame, something is wrong.
if ((prev_frame_slice_index < 0) && (!is_iframe))
{
BASISU_BACKEND_VERIFY(0);
}
if ((is_iframe) || (prev_frame_slice_index < 0))
{
// Ensure no blocks use CR's
for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
{
for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
{
encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);
BASISU_BACKEND_VERIFY(m.m_endpoint_predictor != basist::CR_ENDPOINT_PRED_INDEX);
}
}
}
else
{
// For blocks that use CR's, make sure the endpoints/selectors haven't really changed.
for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
{
for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
{
encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);
if (m.m_endpoint_predictor == basist::CR_ENDPOINT_PRED_INDEX)
{
total_crs++;
encoder_block& prev_m = m_slice_encoder_blocks[prev_frame_slice_index](block_x, block_y);
if ((m.m_endpoint_index != prev_m.m_endpoint_index) || (m.m_selector_index != prev_m.m_selector_index))
{
total_invalid_crs++;
}
}
} // block_x
} // block_y
} // !slice_index
} // slice_index
debug_printf("Total CR's: %u, Total invalid CR's: %u\n", total_crs, total_invalid_crs);
BASISU_BACKEND_VERIFY(total_invalid_crs == 0);
}
void basisu_backend::create_encoder_blocks()
{
basisu_frontend& r = *m_pFront_end;
const bool is_video = r.get_params().m_tex_type == basist::cBASISTexTypeVideoFrames;
m_slice_encoder_blocks.resize(m_slices.size());
uint32_t total_endpoint_pred_missed = 0, total_endpoint_pred_hits = 0, total_block_endpoints_remapped = 0;
uint_vec all_endpoint_indices;
all_endpoint_indices.reserve(get_total_blocks());
for (uint32_t slice_index = 0; slice_index < m_slices.size(); slice_index++)
{
const int prev_frame_slice_index = is_video ? find_video_frame(slice_index, -1) : -1;
const bool is_iframe = m_slices[slice_index].m_iframe;
const uint32_t first_block_index = m_slices[slice_index].m_first_block_index;
const uint32_t width = m_slices[slice_index].m_width;
const uint32_t height = m_slices[slice_index].m_height;
const uint32_t num_blocks_x = m_slices[slice_index].m_num_blocks_x;
const uint32_t num_blocks_y = m_slices[slice_index].m_num_blocks_y;
m_slice_encoder_blocks[slice_index].resize(num_blocks_x, num_blocks_y);
for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
{
for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
{
const uint32_t block_index = first_block_index + block_x + block_y * num_blocks_x;
encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);
m.m_endpoint_index = r.get_subblock_endpoint_cluster_index(block_index, 0);
BASISU_BACKEND_VERIFY(r.get_subblock_endpoint_cluster_index(block_index, 0) == r.get_subblock_endpoint_cluster_index(block_index, 1));
m.m_selector_index = r.get_block_selector_cluster_index(block_index);
m.m_endpoint_predictor = basist::NO_ENDPOINT_PRED_INDEX;
const uint32_t block_endpoint = m.m_endpoint_index;
uint32_t best_endpoint_pred = UINT32_MAX;
for (uint32_t endpoint_pred = 0; endpoint_pred < basist::NUM_ENDPOINT_PREDS; endpoint_pred++)
{
if ((is_video) && (endpoint_pred == basist::CR_ENDPOINT_PRED_INDEX))
{
if ((prev_frame_slice_index != -1) && (!is_iframe))
{
const uint32_t cur_endpoint = m_slice_encoder_blocks[slice_index](block_x, block_y).m_endpoint_index;
const uint32_t cur_selector = m_slice_encoder_blocks[slice_index](block_x, block_y).m_selector_index;
const uint32_t prev_endpoint = m_slice_encoder_blocks[prev_frame_slice_index](block_x, block_y).m_endpoint_index;
const uint32_t prev_selector = m_slice_encoder_blocks[prev_frame_slice_index](block_x, block_y).m_selector_index;
if ((cur_endpoint == prev_endpoint) && (cur_selector == prev_selector))
{
best_endpoint_pred = basist::CR_ENDPOINT_PRED_INDEX;
m_slice_encoder_blocks[prev_frame_slice_index](block_x, block_y).m_is_cr_target = true;
}
}
}
else
{
int pred_block_x = block_x + g_endpoint_preds[endpoint_pred].m_dx;
if ((pred_block_x < 0) || (pred_block_x >= (int)num_blocks_x))
continue;
int pred_block_y = block_y + g_endpoint_preds[endpoint_pred].m_dy;
if ((pred_block_y < 0) || (pred_block_y >= (int)num_blocks_y))
continue;
uint32_t pred_endpoint = m_slice_encoder_blocks[slice_index](pred_block_x, pred_block_y).m_endpoint_index;
if (pred_endpoint == block_endpoint)
{
if (endpoint_pred < best_endpoint_pred)
{
best_endpoint_pred = endpoint_pred;
}
}
}
} // endpoint_pred
if (best_endpoint_pred != UINT32_MAX)
{
m.m_endpoint_predictor = best_endpoint_pred;
total_endpoint_pred_hits++;
}
else if (m_params.m_endpoint_rdo_quality_thresh > 0.0f)
{
const pixel_block& src_pixels = r.get_source_pixel_block(block_index);
etc_block etc_blk(r.get_output_block(block_index));
uint64_t cur_err = etc_blk.evaluate_etc1_error(src_pixels.get_ptr(), r.get_params().m_perceptual);
if (cur_err)
{
const uint64_t thresh_err = (uint64_t)(cur_err * maximum(1.0f, m_params.m_endpoint_rdo_quality_thresh));
etc_block trial_etc_block(etc_blk);
uint64_t best_err = UINT64_MAX;
uint32_t best_endpoint_index = 0;
best_endpoint_pred = UINT32_MAX;
for (uint32_t endpoint_pred = 0; endpoint_pred < basist::NUM_ENDPOINT_PREDS; endpoint_pred++)
{
if ((is_video) && (endpoint_pred == basist::CR_ENDPOINT_PRED_INDEX))
continue;
int pred_block_x = block_x + g_endpoint_preds[endpoint_pred].m_dx;
if ((pred_block_x < 0) || (pred_block_x >= (int)num_blocks_x))
continue;
int pred_block_y = block_y + g_endpoint_preds[endpoint_pred].m_dy;
if ((pred_block_y < 0) || (pred_block_y >= (int)num_blocks_y))
continue;
uint32_t pred_endpoint_index = m_slice_encoder_blocks[slice_index](pred_block_x, pred_block_y).m_endpoint_index;
uint32_t pred_inten = r.get_endpoint_cluster_inten_table(pred_endpoint_index, false);
color_rgba pred_color = r.get_endpoint_cluster_unscaled_color(pred_endpoint_index, false);
trial_etc_block.set_block_color5(pred_color, pred_color);
trial_etc_block.set_inten_table(0, pred_inten);
trial_etc_block.set_inten_table(1, pred_inten);
color_rgba trial_colors[16];
unpack_etc1(trial_etc_block, trial_colors);
uint64_t trial_err = 0;
for (uint32_t p = 0; p < 16; p++)
{
trial_err += color_distance(r.get_params().m_perceptual, src_pixels.get_ptr()[p], trial_colors[p], false);
if (trial_err > thresh_err)
break;
}
if (trial_err <= thresh_err)
{
if ((trial_err < best_err) || ((trial_err == best_err) && (endpoint_pred < best_endpoint_pred)))
{
best_endpoint_pred = endpoint_pred;
best_err = trial_err;
best_endpoint_index = pred_endpoint_index;
}
}
} // endpoint_pred
if (best_endpoint_pred != UINT32_MAX)
{
m.m_endpoint_index = best_endpoint_index;
m.m_endpoint_predictor = best_endpoint_pred;
total_endpoint_pred_hits++;
total_block_endpoints_remapped++;
}
else
{
total_endpoint_pred_missed++;
}
}
}
else
{
total_endpoint_pred_missed++;
}
if (m.m_endpoint_predictor == basist::NO_ENDPOINT_PRED_INDEX)
{
all_endpoint_indices.push_back(m.m_endpoint_index);
}
} // block_x
} // block_y
} // slice
debug_printf("total_endpoint_pred_missed: %u (%3.2f%%) total_endpoint_pred_hit: %u (%3.2f%%), total_block_endpoints_remapped: %u (%3.2f%%)\n",
total_endpoint_pred_missed, total_endpoint_pred_missed * 100.0f / get_total_blocks(),
total_endpoint_pred_hits, total_endpoint_pred_hits * 100.0f / get_total_blocks(),
total_block_endpoints_remapped, total_block_endpoints_remapped * 100.0f / get_total_blocks());
reoptimize_and_sort_endpoints_codebook(total_block_endpoints_remapped, all_endpoint_indices);
sort_selector_codebook();
check_for_valid_cr_blocks();
}
void basisu_backend::compute_slice_crcs()
{
for (uint32_t slice_index = 0; slice_index < m_slices.size(); slice_index++)
{
const uint32_t first_block_index = m_slices[slice_index].m_first_block_index;
const uint32_t width = m_slices[slice_index].m_width;
const uint32_t height = m_slices[slice_index].m_height;
const uint32_t num_blocks_x = m_slices[slice_index].m_num_blocks_x;
const uint32_t num_blocks_y = m_slices[slice_index].m_num_blocks_y;
gpu_image gi;
gi.init(texture_format::cETC1, width, height);
for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
{
for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
{
const uint32_t block_index = first_block_index + block_x + block_y * num_blocks_x;
encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);
{
etc_block& output_block = *(etc_block*)gi.get_block_ptr(block_x, block_y);
output_block.set_diff_bit(true);
output_block.set_flip_bit(true);
const uint32_t endpoint_index = m.m_endpoint_index;
output_block.set_block_color5_etc1s(m_endpoint_palette[endpoint_index].m_color5);
output_block.set_inten_tables_etc1s(m_endpoint_palette[endpoint_index].m_inten5);
const uint32_t selector_idx = m.m_selector_index;
const basist::etc1_selector_palette_entry& selectors = m_selector_palette[selector_idx];
for (uint32_t sy = 0; sy < 4; sy++)
for (uint32_t sx = 0; sx < 4; sx++)
output_block.set_selector(sx, sy, selectors(sx, sy));
}
} // block_x
} // block_y
m_output.m_slice_image_crcs[slice_index] = basist::crc16(gi.get_ptr(), gi.get_size_in_bytes(), 0);
if (m_params.m_debug_images)
{
image gi_unpacked;
gi.unpack(gi_unpacked);
char buf[256];
#ifdef _WIN32
sprintf_s(buf, sizeof(buf), "basisu_backend_slice_%u.png", slice_index);
#else
snprintf(buf, sizeof(buf), "basisu_backend_slice_%u.png", slice_index);
#endif
save_png(buf, gi_unpacked);
}
} // slice_index
}
// TODO: Split this into multiple methods.
bool basisu_backend::encode_image()
{
basisu_frontend& r = *m_pFront_end;
const bool is_video = r.get_params().m_tex_type == basist::cBASISTexTypeVideoFrames;
uint32_t total_used_selector_history_buf = 0;
uint32_t total_selector_indices_remapped = 0;
basist::approx_move_to_front selector_history_buf(basist::MAX_SELECTOR_HISTORY_BUF_SIZE);
histogram selector_history_buf_histogram(basist::MAX_SELECTOR_HISTORY_BUF_SIZE);
histogram selector_histogram(r.get_total_selector_clusters() + basist::MAX_SELECTOR_HISTORY_BUF_SIZE + 1);
histogram selector_history_buf_rle_histogram(1 << basist::SELECTOR_HISTORY_BUF_RLE_COUNT_BITS);
std::vector<uint_vec> selector_syms(m_slices.size());
const uint32_t SELECTOR_HISTORY_BUF_FIRST_SYMBOL_INDEX = r.get_total_selector_clusters();
const uint32_t SELECTOR_HISTORY_BUF_RLE_SYMBOL_INDEX = SELECTOR_HISTORY_BUF_FIRST_SYMBOL_INDEX + basist::MAX_SELECTOR_HISTORY_BUF_SIZE;
m_output.m_slice_image_crcs.resize(m_slices.size());
histogram delta_endpoint_histogram(r.get_total_endpoint_clusters());
histogram endpoint_pred_histogram(basist::ENDPOINT_PRED_TOTAL_SYMBOLS);
std::vector<uint_vec> endpoint_pred_syms(m_slices.size());
uint32_t total_endpoint_indices_remapped = 0;
uint_vec block_endpoint_indices, block_selector_indices;
for (uint32_t slice_index = 0; slice_index < m_slices.size(); slice_index++)
{
const int prev_frame_slice_index = is_video ? find_video_frame(slice_index, -1) : -1;
const int next_frame_slice_index = is_video ? find_video_frame(slice_index, 1) : -1;
const uint32_t first_block_index = m_slices[slice_index].m_first_block_index;
const uint32_t width = m_slices[slice_index].m_width;
const uint32_t height = m_slices[slice_index].m_height;
const uint32_t num_blocks_x = m_slices[slice_index].m_num_blocks_x;
const uint32_t num_blocks_y = m_slices[slice_index].m_num_blocks_y;
selector_history_buf.reset();
int selector_history_buf_rle_count = 0;
int prev_endpoint_pred_sym_bits = -1, endpoint_pred_repeat_count = 0;
uint32_t prev_endpoint_index = 0;
vector2D<uint8_t> block_endpoints_are_referenced(num_blocks_x, num_blocks_y);
for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
{
for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
{
const uint32_t block_index = first_block_index + block_x + block_y * num_blocks_x;
encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);
if (m.m_endpoint_predictor == 0)
block_endpoints_are_referenced(block_x - 1, block_y) = true;
else if (m.m_endpoint_predictor == 1)
block_endpoints_are_referenced(block_x, block_y - 1) = true;
else if (m.m_endpoint_predictor == 2)
{
if (!is_video)
block_endpoints_are_referenced(block_x - 1, block_y - 1) = true;
}
if (is_video)
{
if (m.m_is_cr_target)
block_endpoints_are_referenced(block_x, block_y) = true;
}
} // block_x
} // block_y
for (uint32_t block_y = 0; block_y < num_blocks_y; block_y++)
{
for (uint32_t block_x = 0; block_x < num_blocks_x; block_x++)
{
const uint32_t block_index = first_block_index + block_x + block_y * num_blocks_x;
encoder_block& m = m_slice_encoder_blocks[slice_index](block_x, block_y);
if (((block_x & 1) == 0) && ((block_y & 1) == 0))
{
uint32_t endpoint_pred_cur_sym_bits = 0;
for (uint32_t y = 0; y < 2; y++)
{
for (uint32_t x = 0; x < 2; x++)
{
const uint32_t bx = block_x + x;
const uint32_t by = block_y + y;
uint32_t pred = basist::NO_ENDPOINT_PRED_INDEX;
if ((bx < num_blocks_x) && (by < num_blocks_y))
pred = m_slice_encoder_blocks[slice_index](bx, by).m_endpoint_predictor;
endpoint_pred_cur_sym_bits |= (pred << (x * 2 + y * 4));
}
}
if ((int)endpoint_pred_cur_sym_bits == prev_endpoint_pred_sym_bits)
{
endpoint_pred_repeat_count++;
}
else
{
if (endpoint_pred_repeat_count > 0)
{
if (endpoint_pred_repeat_count > (int)basist::ENDPOINT_PRED_MIN_REPEAT_COUNT)
{
endpoint_pred_histogram.inc(basist::ENDPOINT_PRED_REPEAT_LAST_SYMBOL);
endpoint_pred_syms[slice_index].push_back(basist::ENDPOINT_PRED_REPEAT_LAST_SYMBOL);
endpoint_pred_syms[slice_index].push_back(endpoint_pred_repeat_count);
}
else
{
for (int j = 0; j < endpoint_pred_repeat_count; j++)
{
endpoint_pred_histogram.inc(prev_endpoint_pred_sym_bits);
endpoint_pred_syms[slice_index].push_back(prev_endpoint_pred_sym_bits);
}
}
endpoint_pred_repeat_count = 0;
}
endpoint_pred_histogram.inc(endpoint_pred_cur_sym_bits);
endpoint_pred_syms[slice_index].push_back(endpoint_pred_cur_sym_bits);
prev_endpoint_pred_sym_bits = endpoint_pred_cur_sym_bits;
}
}
int new_endpoint_index = m_endpoint_remap_table_old_to_new[m.m_endpoint_index];
if (m.m_endpoint_predictor == basist::NO_ENDPOINT_PRED_INDEX)
{
int endpoint_delta = new_endpoint_index - prev_endpoint_index;
if ((m_params.m_endpoint_rdo_quality_thresh > 1.0f) && (iabs(endpoint_delta) > 1) && (!block_endpoints_are_referenced(block_x, block_y)))
{
const pixel_block& src_pixels = r.get_source_pixel_block(block_index);
etc_block etc_blk(r.get_output_block(block_index));
const uint64_t cur_err = etc_blk.evaluate_etc1_error(src_pixels.get_ptr(), r.get_params().m_perceptual);
if (cur_err)
{
const float endpoint_remap_thresh = maximum(1.0f, m_params.m_endpoint_rdo_quality_thresh);
const uint64_t thresh_err = (uint64_t)(cur_err * endpoint_remap_thresh);
uint64_t best_trial_err = UINT64_MAX;
int best_trial_idx = 0;
etc_block trial_etc_blk(etc_blk);
const int MAX_ENDPOINT_SEARCH_DIST = 32;
const int search_dist = minimum<int>(iabs(endpoint_delta) - 1, MAX_ENDPOINT_SEARCH_DIST);
for (int d = -search_dist; d < search_dist; d++)
{
int trial_idx = prev_endpoint_index + d;
if (trial_idx < 0)
trial_idx += (int)r.get_total_endpoint_clusters();
else if (trial_idx >= (int)r.get_total_endpoint_clusters())
trial_idx -= (int)r.get_total_endpoint_clusters();
if (trial_idx == new_endpoint_index)
continue;
const etc1_endpoint_palette_entry& p = m_endpoint_palette[m_endpoint_remap_table_new_to_old[trial_idx]];
trial_etc_blk.set_block_color5_etc1s(p.m_color5);
trial_etc_blk.set_inten_tables_etc1s(p.m_inten5);
uint64_t trial_err = trial_etc_blk.evaluate_etc1_error(src_pixels.get_ptr(), r.get_params().m_perceptual);
if (trial_err <= thresh_err)
{
if (trial_err < best_trial_err)
{
best_trial_err = trial_err;
best_trial_idx = trial_idx;
}
}
}
if (best_trial_err != UINT64_MAX)
{
m.m_endpoint_index = m_endpoint_remap_table_new_to_old[best_trial_idx];
new_endpoint_index = best_trial_idx;
endpoint_delta = new_endpoint_index - prev_endpoint_index;
total_endpoint_indices_remapped++;
}
}
}
if (endpoint_delta < 0)
endpoint_delta += (int)r.get_total_endpoint_clusters();
delta_endpoint_histogram.inc(endpoint_delta);
}
block_endpoint_indices.push_back(m_endpoint_remap_table_new_to_old[new_endpoint_index]);
prev_endpoint_index = new_endpoint_index;
if ((!is_video) || (m.m_endpoint_predictor != basist::CR_ENDPOINT_PRED_INDEX))
{
int new_selector_index = m_selector_remap_table_old_to_new[m.m_selector_index];
int selector_history_buf_index = -1;
if (m.m_is_cr_target)
{
for (uint32_t j = 0; j < selector_history_buf.size(); j++)
{
const int trial_idx = selector_history_buf[j];
if (trial_idx == new_selector_index)
{
total_used_selector_history_buf++;
selector_history_buf_index = j;
selector_history_buf_histogram.inc(j);
break;
}
}
}
else
{
const pixel_block& src_pixels = r.get_source_pixel_block(block_index);
etc_block etc_blk(r.get_output_block(block_index));
color_rgba etc_blk_unpacked[16];
unpack_etc1(etc_blk, etc_blk_unpacked);
uint64_t cur_err = 0;
for (uint32_t p = 0; p < 16; p++)
cur_err += color_distance(r.get_params().m_perceptual, src_pixels.get_ptr()[p], etc_blk_unpacked[p], false);
uint64_t best_trial_err = UINT64_MAX;
int best_trial_idx = 0;
uint32_t best_trial_history_buf_idx = 0;
const float selector_remap_thresh = maximum(1.0f, m_params.m_selector_rdo_quality_thresh); //2.5f;
const bool use_strict_search = (m_params.m_compression_level == 0) && (selector_remap_thresh == 1.0f);
for (uint32_t j = 0; j < selector_history_buf.size(); j++)
{
const int trial_idx = selector_history_buf[j];
if (use_strict_search)
{
if (trial_idx == new_selector_index)
{
best_trial_err = 0;
best_trial_idx = trial_idx;
best_trial_history_buf_idx = j;
break;
}
}
else
{
for (uint32_t sy = 0; sy < 4; sy++)
for (uint32_t sx = 0; sx < 4; sx++)
etc_blk.set_selector(sx, sy, m_selector_palette[m_selector_remap_table_new_to_old[trial_idx]](sx, sy));
// TODO: Optimize this
unpack_etc1(etc_blk, etc_blk_unpacked);
uint64_t trial_err = 0;
const uint64_t thresh_err = minimum((uint64_t)ceilf(cur_err * selector_remap_thresh), best_trial_err);
for (uint32_t p = 0; p < 16; p++)
{
trial_err += color_distance(r.get_params().m_perceptual, src_pixels.get_ptr()[p], etc_blk_unpacked[p], false);
if (trial_err > thresh_err)
break;
}
if (trial_err <= cur_err * selector_remap_thresh)
{
if (trial_err < best_trial_err)
{
best_trial_err = trial_err;
best_trial_idx = trial_idx;
best_trial_history_buf_idx = j;
}
}
}
}
if (best_trial_err != UINT64_MAX)
{
if (new_selector_index != best_trial_idx)
total_selector_indices_remapped++;
new_selector_index = best_trial_idx;
total_used_selector_history_buf++;
selector_history_buf_index = best_trial_history_buf_idx;
selector_history_buf_histogram.inc(best_trial_history_buf_idx);
}
} // if (m_params.m_selector_rdo_quality_thresh > 0.0f)
m.m_selector_index = m_selector_remap_table_new_to_old[new_selector_index];
if ((selector_history_buf_rle_count) && (selector_history_buf_index != 0))
{
if (selector_history_buf_rle_count >= (int)basist::SELECTOR_HISTORY_BUF_RLE_COUNT_THRESH)
{
selector_syms[slice_index].push_back(SELECTOR_HISTORY_BUF_RLE_SYMBOL_INDEX);
selector_syms[slice_index].push_back(selector_history_buf_rle_count);
int run_sym = selector_history_buf_rle_count - basist::SELECTOR_HISTORY_BUF_RLE_COUNT_THRESH;
if (run_sym >= ((int)basist::SELECTOR_HISTORY_BUF_RLE_COUNT_TOTAL - 1))
selector_history_buf_rle_histogram.inc(basist::SELECTOR_HISTORY_BUF_RLE_COUNT_TOTAL - 1);
else
selector_history_buf_rle_histogram.inc(run_sym);
selector_histogram.inc(SELECTOR_HISTORY_BUF_RLE_SYMBOL_INDEX);
}
else
{
for (int k = 0; k < selector_history_buf_rle_count; k++)
{
uint32_t sym_index = SELECTOR_HISTORY_BUF_FIRST_SYMBOL_INDEX + 0;
selector_syms[slice_index].push_back(sym_index);
selector_histogram.inc(sym_index);
}
}
selector_history_buf_rle_count = 0;
}
if (selector_history_buf_index >= 0)
{
if (selector_history_buf_index == 0)
selector_history_buf_rle_count++;
else