-
Notifications
You must be signed in to change notification settings - Fork 0
/
adlib.cpp
1052 lines (890 loc) · 36.7 KB
/
adlib.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
#include <math.h>
#include <memory.h>
typedef unsigned char uint8;
typedef signed char int8;
typedef unsigned short uint16;
typedef signed short int16;
typedef unsigned int uint32;
typedef signed int int32;
#define NUM_MIDI_CHANNELS 15
struct MidiChannel {
uint8 program;
uint8 volume;
uint8 pedal;
} midi_channels[NUM_MIDI_CHANNELS];
enum DriverStatus {
kStatusStopped,
kStatusPlaying,
kStatusPaused
};
DriverStatus driver_status;
bool driver_installed;
uint32 midi_buffer_pos;
uint16 midi_division; // in ppqn
uint16 midi_event_delta;
uint8 midi_event_type, last_midi_event_type;
uint8 midi_tempo;
uint8 midi_event_channel;
uint8 midi_onoff_note;
uint8 midi_onoff_velocity;
int16 midi_pitch_bend;
uint8 midi_fade_volume_change_rate;
// set by the client
uint32 midi_buffer_size;
bool midi_loop;
uint8 midi_volume; // coarse volume
bool midi_fade_out_flag;
bool midi_fade_in_flag;
// fade in
bool driver_fading_in;
uint32 fadein_volume_cur;
uint32 fadein_volume_inc;
// fade out
bool driver_fading_out;
uint32 fadeout_volume_cur;
uint32 fadeout_volume_dec;
uint32 driver_lin_volume[128];
// internal fine volume
uint16 full_volume;
#define COARSE_VOL(x) ((x)>>8)
#define FINE_VOL(x) ((x)<<8)
/**********************************
prototypes
*/
// midi driver
uint8 read_midi_byte();
uint16 read_midi_word();
uint32 read_midi_VLQ();
void midi_fadeout_and_stop();
void midi_stop();
void midi_pause();
void midi_resume();
void midi_set_tempo();
void process_midi_meta_event();
void process_midi_channel_event();
void process_meta_tempo_event();
// timers
void set_hw_timer(uint16 clock);
void reset_hw_timer();
// OPL
void ADLIB_init();
void ADLIB_tick();
void ADLIB_init_voices();
void ADLIB_mute_voices();
void ADLIB_turn_on_voice();
void ADLIB_turn_off_voice();
void ADLIB_pitch_bend(int amount, uint8 midi_channel);
void ADLIB_modulation(int value);
/**********************************
msc-midi driver
*/
void midi_driver() {
while (true) {
if (!driver_installed) {
return;
}
if (driver_status != kStatusPlaying) {
return;
}
if (midi_buffer_pos < midi_buffer_size) {
// playback
if (driver_fading_in) {
if (full_volume > COARSE_VOL(fadein_volume_cur)) {
fadein_volume_cur += fadein_volume_inc;
midi_volume = COARSE_VOL(fadein_volume_cur);
} else {
driver_fading_in = false;
midi_volume = full_volume;
break; //return
}
}
if (driver_fading_out) {
if (0 < COARSE_VOL(fadeout_volume_cur)) {
fadeout_volume_cur -= fadeout_volume_dec;
midi_volume = COARSE_VOL(fadeout_volume_cur);
} else {
driver_fading_out = false;
midi_volume = full_volume;
midi_fade_out_flag = false; // needed to force stopping
midi_fadeout_and_stop();
midi_fade_out_flag = true; // reset the flag
break; //return
}
}
ADLIB_tick();
if (midi_event_delta != 0) {
midi_event_delta--;
break; // return
}
if (midi_event_type == 255) {
process_midi_meta_event();
midi_event_delta = read_midi_word();
midi_event_type = read_midi_byte();
} else {
if ((midi_event_type & 0x80) == 0) {
// repeat the last event
midi_buffer_pos--;
midi_event_type = last_midi_event_type;
}
process_midi_channel_event();
last_midi_event_type = midi_event_type;
midi_event_delta = read_midi_word();
midi_event_type = read_midi_byte();
}
} else {
// end-of-file
if (midi_loop) {
// loop the file from the beginning
midi_buffer_pos = 7; // skip signature and a couple of fields
midi_event_delta = read_midi_word();
midi_event_type = read_midi_byte();
} else {
midi_stop();
break; // return
}
}
}
}
void midi_fadeout_and_stop() {
if (!driver_installed) {
return;
}
if (driver_status == kStatusStopped) {
return;
}
if (midi_fade_out_flag && !driver_fading_out) {
// start a fadeout
driver_fading_out = true;
full_volume = midi_volume;
fadeout_volume_dec = FINE_VOL(midi_volume) / (midi_fade_volume_change_rate * midi_division);
fadeout_volume_cur = FINE_VOL(midi_volume);
} else {
midi_stop();
}
}
void midi_stop() {
ADLIB_mute_voices();
reset_hw_timer(); // restore the previous timer frequency
driver_status = kStatusStopped;
}
void midi_pause() {
if (!driver_installed) {
return;
}
ADLIB_mute_voices();
reset_hw_timer();
driver_status = kStatusPaused;
}
void midi_resume() {
if (!driver_installed) {
return;
}
if (driver_status != kStatusPaused) {
ADLIB_init_voices();
driver_fading_in = false;
driver_fading_out = false;
midi_buffer_pos = 4; // skip signature
midi_tempo = read_midi_byte();
midi_division = read_midi_word();
if (midi_division > 255) {
midi_division = 192;
}
midi_event_delta = read_midi_word();
midi_event_type = read_midi_byte();
last_midi_event_type = 0;
if (midi_fade_in_flag && !driver_fading_in) {
// start a fade in
full_volume = midi_volume;
driver_fading_in = true;
fadein_volume_inc = FINE_VOL(midi_volume) / (midi_fade_volume_change_rate * midi_division);
fadein_volume_cur = 0;
}
}
midi_set_tempo();
driver_status = kStatusPlaying;
}
void midi_set_tempo() {
uint16 word_13A3F = (midi_tempo * midi_division) / 60;
set_hw_timer(word_13A3F);
}
void process_midi_meta_event() {
uint8 type = read_midi_byte();
uint8 length = read_midi_byte();
if (type == 81) { // tempo event
process_meta_tempo_event();
} else {
// discard other meta events
for (int i = 0; i < length; ++i) {
read_midi_byte();
}
}
}
#define BYTE3(a,b,c) (((a) << 16) | ((b) << 8) | (c))
void process_meta_tempo_event() {
uint8 v0 = read_midi_byte();
uint8 v1 = read_midi_byte();
uint8 v2 = read_midi_byte();
midi_tempo = 60000000 / BYTE3(v0,v1,v2);
midi_set_tempo();
}
#define NOTE_KEY(note) ((note) & 0xFF)
#define NOTE_VEL(note) (((note) >> 8) & 0xFF)
#define NOTEON_VEL(note) ((driver_lin_volume[midi_volume] * NOTE_VEL(note)) >> 8)
void process_midi_channel_event() {
midi_event_channel = midi_event_type & 0xF;
uint8 event_type = midi_event_type >> 4;
uint16 note_info;
uint8 controller_number, controller_value;
switch (event_type) {
case 9: // note on
note_info = read_midi_word();
midi_onoff_note = NOTE_KEY(note_info);
midi_onoff_velocity = NOTEON_VEL(midi_onoff_note);
ADLIB_turn_on_voice();
break; // return
case 8: // note off
note_info = read_midi_word();
midi_onoff_note = NOTE_KEY(note_info);
midi_onoff_velocity = NOTE_VEL(midi_onoff_note);
ADLIB_turn_off_voice();
break; // return
case 12: // program change
midi_channels[midi_event_channel].program = read_midi_byte();
break; // return
case 13: // channel aftertouch
read_midi_byte();
break; // return
case 10: // note aftertouch
read_midi_word();
break; // return
case 14: // pitch bend
// this should always read 2 bytes from the stream, so using VLQ might not be correct
midi_pitch_bend = read_midi_VLQ();
ADLIB_pitch_bend(midi_pitch_bend, midi_event_channel);
break;
case 11: // controller
controller_number = read_midi_byte();
controller_value = read_midi_byte();
switch (controller_number) {
case 1: // modulation
ADLIB_modulation(controller_value);
break; // return
case 7: // main volume
midi_channels[midi_event_channel].volume = controller_value;
break; // return
case 4: // foot controller
midi_channels[midi_event_channel].pedal = (controller_value >= 64);
break; // return
case 123: // all notes off
ADLIB_mute_voices();
break; // return
}
break;
default:
break;
}
}
void midi_init() {
// linear map [0..127] to [0..128] (user volume to driver volume?)
const float k = 128.0f / 127.0f;
for (int i = 0; i < 128; ++i) {
driver_lin_volume[i] = (uint32)round(k * (float)i);
}
ADLIB_init();
midi_buffer_pos = 4;
midi_tempo = 120;
midi_division = 192;
midi_event_delta = 0;
midi_event_type = 0;
last_midi_event_type = 0;
midi_fade_volume_change_rate = 0;
midi_fade_out_flag = false;
midi_fade_in_flag = false;
driver_fading_out = false;
driver_fading_in = false;
midi_loop = false;
driver_status = kStatusStopped;
midi_volume = 127;
}
/**********************************
static data
*/
struct OplOperator {
uint8 characteristic; // amplitude modulation, vibrato, envelope, keyboard scaling, modulator frequency
uint8 levels;
uint8 attack_decay;
uint8 sustain_release;
uint8 waveform;
};
// (almost) static info about notes played by percussions
// fields with _2 are used only by the bass drum (2 operators)
struct PercussionNote {
OplOperator op[2];
uint8 feedback_algo; // only used by the bass drum
uint8 percussion;
uint8 valid;
uint16 fnumber;
uint8 octave;
};
struct MelodicProgram {
OplOperator op[2];
uint8 feedback_algo;
};
MelodicProgram melodic_programs[128] = {
{ 0x1, 0x51, 0xf2, 0xb2, 0x0, 0x11, 0x0, 0xf2, 0xa2, 0x0, 0x0 },
{ 0xc2, 0x4b, 0xf1, 0x53, 0x0, 0xd2, 0x0, 0xf2, 0x74, 0x0, 0x4 },
{ 0x81, 0x9d, 0xf2, 0x74, 0x0, 0x13, 0x0, 0xf2, 0xf1, 0x0, 0x6 },
{ 0x3, 0x4f, 0xf1, 0x53, 0x0, 0x17, 0x3, 0xf2, 0x74, 0x0, 0x6 },
{ 0xd1, 0x81, 0x81, 0x73, 0x2, 0xd4, 0x0, 0xe1, 0x34, 0x0, 0x3 },
{ 0x1, 0x0, 0x94, 0xa6, 0x0, 0x2, 0x0, 0x83, 0x26, 0x0, 0x1 },
{ 0xf3, 0x84, 0x81, 0x2, 0x1, 0x55, 0x80, 0xdd, 0x3, 0x0, 0x4 },
{ 0x5, 0x8a, 0xf2, 0x26, 0x0, 0x1, 0x80, 0xf3, 0x48, 0x0, 0x0 },
{ 0x32, 0x0, 0xb1, 0x14, 0x0, 0x12, 0x0, 0xfd, 0x36, 0x0, 0x3 },
{ 0x1, 0x0, 0x82, 0xa, 0x2, 0x2, 0x0, 0x85, 0x15, 0x0, 0x3 },
{ 0xd1, 0x1, 0x97, 0xaa, 0x0, 0x4, 0xd, 0xf3, 0xa5, 0x1, 0x9 },
{ 0x17, 0x0, 0xf2, 0x62, 0x0, 0x12, 0x0, 0xf2, 0x72, 0x0, 0x8 },
{ 0x6, 0x0, 0xff, 0xf4, 0x0, 0xc4, 0x0, 0xf8, 0xb5, 0x0, 0xe },
{ 0xc0, 0x81, 0xf2, 0x13, 0x2, 0xc0, 0xc1, 0xf3, 0x14, 0x2, 0xb },
{ 0x44, 0x53, 0xf5, 0x31, 0x0, 0x60, 0x80, 0xfd, 0x22, 0x0, 0x6 },
{ 0xe0, 0x80, 0xf4, 0xf2, 0x0, 0x61, 0x0, 0xf2, 0x6, 0x0, 0x8 },
{ 0xc1, 0x6, 0x83, 0x23, 0x0, 0xc1, 0x4, 0xf0, 0x26, 0x0, 0x1 },
{ 0x26, 0x0, 0xf4, 0xb6, 0x0, 0x21, 0x0, 0x81, 0x4b, 0x0, 0x1 },
{ 0x24, 0x80, 0xff, 0xf, 0x0, 0x21, 0x80, 0xff, 0xf, 0x0, 0x1 },
{ 0x24, 0x4f, 0xf2, 0xb, 0x0, 0x31, 0x0, 0x52, 0xb, 0x0, 0xb },
{ 0x31, 0x8, 0x81, 0xb, 0x0, 0xa1, 0x80, 0x92, 0x3b, 0x0, 0x0 },
{ 0x70, 0xc5, 0x52, 0x11, 0x1, 0x71, 0x80, 0x31, 0xfe, 0x1, 0x0 },
{ 0x51, 0x88, 0x10, 0xf0, 0x0, 0x42, 0x83, 0x40, 0xfc, 0x0, 0x8 },
{ 0xf0, 0xd9, 0x81, 0x3, 0x0, 0xb1, 0x80, 0xf1, 0x5, 0x0, 0xa },
{ 0x21, 0x4f, 0xf1, 0x31, 0x0, 0x2, 0x80, 0xc3, 0x45, 0x0, 0x0 },
{ 0x7, 0x8f, 0x9c, 0x33, 0x1, 0x1, 0x80, 0x8a, 0x13, 0x0, 0x0 },
{ 0x21, 0x40, 0xf1, 0x31, 0x0, 0x6, 0x80, 0xf4, 0x44, 0x0, 0x0 },
{ 0x21, 0x40, 0xf1, 0x31, 0x3, 0x81, 0x0, 0xf4, 0x44, 0x2, 0x2 },
{ 0x11, 0x8d, 0xfd, 0x11, 0x0, 0x11, 0x80, 0xfd, 0x11, 0x0, 0x8 },
{ 0xf0, 0x1, 0x97, 0x17, 0x0, 0x21, 0xd, 0xf1, 0x18, 0x0, 0x8 },
{ 0xf1, 0x1, 0x97, 0x17, 0x0, 0x21, 0xd, 0xf1, 0x18, 0x0, 0x8 },
{ 0xcd, 0x9e, 0x55, 0xd1, 0x0, 0xd1, 0x0, 0xf2, 0x71, 0x0, 0xe },
{ 0x1, 0x0, 0xf2, 0x88, 0x0, 0x1, 0x0, 0xf5, 0x88, 0x0, 0x1 },
{ 0x30, 0xd, 0xf2, 0xef, 0x0, 0x21, 0x0, 0xf5, 0x78, 0x0, 0x6 },
{ 0x0, 0x10, 0xf4, 0xd9, 0x0, 0x0, 0x0, 0xf5, 0xd7, 0x0, 0x4 },
{ 0x1, 0x4c, 0xf2, 0x50, 0x0, 0x1, 0x40, 0xd2, 0x59, 0x0, 0x8 },
{ 0x20, 0x11, 0xe2, 0x8a, 0x0, 0x20, 0x0, 0xe4, 0xa8, 0x0, 0xa },
{ 0x21, 0x40, 0x7b, 0x4, 0x1, 0x21, 0x0, 0x75, 0x72, 0x0, 0x2 },
{ 0x31, 0xd, 0xf2, 0xef, 0x0, 0x21, 0x0, 0xf5, 0x78, 0x0, 0xa },
{ 0x1, 0xc, 0xf5, 0x2f, 0x1, 0x0, 0x80, 0xf5, 0x5c, 0x0, 0x0 },
{ 0xb0, 0x1c, 0x81, 0x3, 0x2, 0x20, 0x0, 0x54, 0x67, 0x2, 0xe },
{ 0x1, 0x0, 0xf1, 0x65, 0x0, 0x1, 0x80, 0xa3, 0xa8, 0x2, 0x1 },
{ 0xe1, 0x4f, 0xc1, 0xd3, 0x2, 0x21, 0x0, 0x32, 0x74, 0x1, 0x0 },
{ 0x2, 0x0, 0xf6, 0x16, 0x0, 0x12, 0x0, 0xf2, 0xf8, 0x0, 0x1 },
{ 0xe0, 0x63, 0xf8, 0xf3, 0x0, 0x70, 0x80, 0xf7, 0xf3, 0x0, 0x4 },
{ 0x1, 0x6, 0xf3, 0xff, 0x0, 0x8, 0x0, 0xf7, 0xff, 0x0, 0x4 },
{ 0x21, 0x16, 0xb0, 0x81, 0x1, 0x22, 0x0, 0xb3, 0x13, 0x1, 0xc },
{ 0x1, 0x4f, 0xf0, 0xff, 0x0, 0x30, 0x0, 0x90, 0xf, 0x0, 0x6 },
{ 0x0, 0x10, 0xf1, 0xf2, 0x2, 0x1, 0x0, 0xf1, 0xf2, 0x3, 0x0 },
{ 0x1, 0x4f, 0xf1, 0x50, 0x0, 0x21, 0x80, 0xa3, 0x5, 0x3, 0x6 },
{ 0xb1, 0x3, 0x55, 0x3, 0x0, 0xb1, 0x3, 0x8, 0xa, 0x0, 0x9 },
{ 0x22, 0x0, 0xa9, 0x34, 0x1, 0x1, 0x0, 0xa2, 0x42, 0x2, 0x2 },
{ 0xa0, 0xdc, 0x81, 0x31, 0x3, 0xb1, 0x80, 0xf1, 0x1, 0x3, 0x0 },
{ 0x1, 0x4f, 0xf1, 0x50, 0x0, 0x21, 0x80, 0xa3, 0x5, 0x3, 0x6 },
{ 0xf1, 0x80, 0xa0, 0x72, 0x0, 0x74, 0x0, 0x90, 0x22, 0x0, 0x9 },
{ 0xe1, 0x13, 0x71, 0xae, 0x0, 0xe1, 0x0, 0xf0, 0xfc, 0x1, 0xa },
{ 0x31, 0x1c, 0x41, 0xb, 0x0, 0xa1, 0x80, 0x92, 0x3b, 0x0, 0xe },
{ 0x71, 0x1c, 0x41, 0x1f, 0x0, 0xa1, 0x80, 0x92, 0x3b, 0x0, 0xe },
{ 0x21, 0x1c, 0x53, 0x1d, 0x0, 0xa1, 0x80, 0x52, 0x3b, 0x0, 0xc },
{ 0x21, 0x1d, 0xa4, 0xae, 0x1, 0x21, 0x0, 0xb1, 0x9e, 0x0, 0xc },
{ 0xe1, 0x16, 0x71, 0xae, 0x0, 0xe1, 0x0, 0x81, 0x9e, 0x0, 0xa },
{ 0xe1, 0x15, 0x71, 0xae, 0x0, 0xe2, 0x0, 0x81, 0x9e, 0x0, 0xe },
{ 0x21, 0x16, 0x71, 0xae, 0x0, 0x21, 0x0, 0x81, 0x9e, 0x0, 0xe },
{ 0x71, 0x1c, 0x41, 0x1f, 0x0, 0xa1, 0x80, 0x92, 0x3b, 0x0, 0xe },
{ 0x21, 0x4f, 0x81, 0x53, 0x0, 0x32, 0x0, 0x22, 0x2c, 0x0, 0xa },
{ 0x22, 0x4f, 0x81, 0x53, 0x0, 0x32, 0x0, 0x22, 0x2c, 0x0, 0xa },
{ 0x23, 0x4f, 0x81, 0x53, 0x0, 0x34, 0x0, 0x22, 0x2c, 0x0, 0xa },
{ 0xe1, 0x16, 0x71, 0xae, 0x0, 0xe1, 0x0, 0x81, 0x9e, 0x0, 0xa },
{ 0x71, 0xc5, 0x6e, 0x17, 0x0, 0x22, 0x5, 0x8b, 0xe, 0x0, 0x2 },
{ 0xe6, 0x27, 0x70, 0xf, 0x1, 0xe3, 0x0, 0x60, 0x9f, 0x0, 0xa },
{ 0x30, 0xc8, 0xd5, 0x19, 0x0, 0xb1, 0x80, 0x61, 0x1b, 0x0, 0xc },
{ 0x32, 0x9a, 0x51, 0x1b, 0x0, 0xa1, 0x82, 0xa2, 0x3b, 0x0, 0xc },
{ 0xad, 0x3, 0x74, 0x29, 0x0, 0xa2, 0x82, 0x73, 0x29, 0x0, 0x7 },
{ 0x21, 0x83, 0x74, 0x17, 0x0, 0x62, 0x8d, 0x65, 0x17, 0x0, 0x7 },
{ 0x94, 0xb, 0x85, 0xff, 0x1, 0x13, 0x0, 0x74, 0xff, 0x0, 0xc },
{ 0x74, 0x87, 0xa4, 0x2, 0x0, 0xd6, 0x80, 0x45, 0x42, 0x0, 0x2 },
{ 0xb3, 0x85, 0x76, 0x21, 0x1, 0x20, 0x0, 0x3d, 0xc1, 0x0, 0x6 },
{ 0x17, 0x4f, 0xf2, 0x61, 0x0, 0x12, 0x8, 0xf1, 0xb4, 0x0, 0x8 },
{ 0x4f, 0x86, 0x65, 0x1, 0x0, 0x1f, 0x0, 0x32, 0x74, 0x0, 0x4 },
{ 0xe1, 0x23, 0x71, 0xae, 0x0, 0xe4, 0x0, 0x82, 0x9e, 0x0, 0xa },
{ 0x11, 0x86, 0xf2, 0xbd, 0x0, 0x4, 0x80, 0xa0, 0x9b, 0x1, 0x8 },
{ 0x20, 0x90, 0xf5, 0x9e, 0x2, 0x11, 0x0, 0xf4, 0x5b, 0x3, 0xc },
{ 0xf0, 0x80, 0x34, 0xe4, 0x0, 0x7e, 0x0, 0xa2, 0x6, 0x0, 0x8 },
{ 0x90, 0xf, 0xff, 0x1, 0x3, 0x0, 0x0, 0x1f, 0x1, 0x0, 0xe },
{ 0x1, 0x4f, 0xf0, 0xff, 0x0, 0x33, 0x0, 0x90, 0xf, 0x0, 0x6 },
{ 0x1e, 0x0, 0x1f, 0xf, 0x0, 0x10, 0x0, 0x1f, 0x7f, 0x0, 0x0 },
{ 0xbe, 0x0, 0xf1, 0x1, 0x3, 0x31, 0x0, 0xf1, 0x1, 0x0, 0x4 },
{ 0xbe, 0x0, 0xf1, 0x1, 0x3, 0x31, 0x0, 0xf1, 0x1, 0x0, 0x4 },
{ 0x93, 0x6, 0xc1, 0x4, 0x1, 0x82, 0x0, 0x51, 0x9, 0x0, 0x6 },
{ 0xa0, 0x0, 0x96, 0x33, 0x0, 0x20, 0x0, 0x55, 0x2b, 0x0, 0x6 },
{ 0x0, 0xc0, 0xff, 0x5, 0x0, 0x0, 0x0, 0xff, 0x5, 0x3, 0x0 },
{ 0x4, 0x8, 0xf8, 0x7, 0x0, 0x1, 0x0, 0x82, 0x74, 0x0, 0x8 },
{ 0x0, 0x0, 0x2f, 0x5, 0x0, 0x20, 0x0, 0xff, 0x5, 0x3, 0xa },
{ 0x93, 0x0, 0xf7, 0x7, 0x2, 0x0, 0x0, 0xf7, 0x7, 0x0, 0xa },
{ 0x0, 0x40, 0x80, 0x7a, 0x0, 0xc4, 0x0, 0xc0, 0x7e, 0x0, 0x8 },
{ 0x90, 0x80, 0x55, 0xf5, 0x0, 0x0, 0x0, 0x55, 0xf5, 0x0, 0x8 },
{ 0xe1, 0x80, 0x34, 0xe4, 0x0, 0x69, 0x0, 0xf2, 0x6, 0x0, 0x8 },
{ 0x3, 0x2, 0xf0, 0xff, 0x3, 0x11, 0x80, 0xf0, 0xff, 0x2, 0x2 },
{ 0x1e, 0x0, 0x1f, 0xf, 0x0, 0x10, 0x0, 0x1f, 0x7f, 0x0, 0x0 },
{ 0x0, 0x0, 0x2f, 0x1, 0x0, 0x0, 0x0, 0xff, 0x1, 0x0, 0x4 },
{ 0xbe, 0x0, 0xf1, 0x1, 0x3, 0x31, 0x0, 0xf1, 0x1, 0x0, 0x4 },
{ 0x93, 0x85, 0x3f, 0x6, 0x1, 0x0, 0x0, 0x5f, 0x7, 0x0, 0x6 },
{ 0x6, 0x0, 0xa0, 0xf0, 0x0, 0x44, 0x0, 0xc5, 0x75, 0x0, 0xe },
{ 0x60, 0x0, 0x10, 0x81, 0x0, 0x20, 0x8c, 0x12, 0x91, 0x0, 0xe },
{ 0x1, 0x40, 0xf1, 0x53, 0x0, 0x8, 0x40, 0xf1, 0x53, 0x0, 0x0 },
{ 0x31, 0x0, 0x56, 0x31, 0x0, 0x16, 0x0, 0x7d, 0x41, 0x0, 0x0 },
{ 0x0, 0x10, 0xf2, 0x72, 0x0, 0x13, 0x0, 0xf2, 0x72, 0x0, 0xc },
{ 0x10, 0x0, 0x75, 0x93, 0x1, 0x1, 0x0, 0xf5, 0x82, 0x1, 0x0 },
{ 0x0, 0x0, 0xf6, 0xff, 0x2, 0x0, 0x0, 0xf6, 0xff, 0x0, 0x8 },
{ 0x30, 0x0, 0xff, 0xa0, 0x3, 0x63, 0x0, 0x65, 0xb, 0x2, 0x0 },
{ 0x2a, 0x0, 0xf6, 0x87, 0x0, 0x2b, 0x0, 0x76, 0x25, 0x0, 0x0 },
{ 0x85, 0x0, 0xb8, 0x84, 0x0, 0x43, 0x0, 0xe5, 0x8f, 0x0, 0x6 },
{ 0x7, 0x4f, 0xf2, 0x60, 0x0, 0x12, 0x0, 0xf2, 0x72, 0x0, 0x8 },
{ 0x5, 0x40, 0xb3, 0xd3, 0x0, 0x86, 0x80, 0xf2, 0x24, 0x0, 0x2 },
{ 0xd0, 0x0, 0x11, 0xcf, 0x0, 0xd1, 0x0, 0xf4, 0xe8, 0x3, 0x0 },
{ 0x5, 0x4e, 0xda, 0x25, 0x2, 0x1, 0x0, 0xf9, 0x15, 0x0, 0xa },
{ 0x3, 0x0, 0x8f, 0x7, 0x2, 0x2, 0x0, 0xff, 0x6, 0x0, 0x0 },
{ 0x13, 0x0, 0x8f, 0x7, 0x2, 0x2, 0x0, 0xf9, 0x5, 0x0, 0x0 },
{ 0xf0, 0x1, 0x97, 0x17, 0x0, 0x21, 0xd, 0xf1, 0x18, 0x0, 0x8 },
{ 0xf1, 0x41, 0x11, 0x11, 0x0, 0xf1, 0x41, 0x11, 0x11, 0x0, 0x2 },
{ 0x13, 0x0, 0x8f, 0x7, 0x2, 0x2, 0x0, 0xff, 0x6, 0x0, 0x0 },
{ 0x1, 0x0, 0x2f, 0x1, 0x0, 0x1, 0x0, 0xaf, 0x1, 0x3, 0xf },
{ 0x1, 0x6, 0xf3, 0xff, 0x0, 0x8, 0x0, 0xf7, 0xff, 0x0, 0x4 },
{ 0xc0, 0x4f, 0xf1, 0x3, 0x0, 0xbe, 0xc, 0x10, 0x1, 0x0, 0x2 },
{ 0x0, 0x2, 0xf0, 0xff, 0x0, 0x11, 0x80, 0xf0, 0xff, 0x0, 0x6 },
{ 0x81, 0x47, 0xf1, 0x83, 0x0, 0xa2, 0x4, 0x91, 0x86, 0x0, 0x6 },
{ 0xf0, 0xc0, 0xff, 0xff, 0x3, 0xe5, 0x0, 0xfb, 0xf0, 0x0, 0xe },
{ 0x0, 0x2, 0xf0, 0xff, 0x0, 0x11, 0x80, 0xf0, 0xff, 0x0, 0x6 }
};
PercussionNote percussion_notes[47] = {
{ 0x0, 0xb, 0xa8, 0x38, 0x0, 0x0, 0x0, 0xd6, 0x49, 0x0, 0x0, 0x4, 0x1, 0x97, 0x4 },
{ 0xc0, 0xc0, 0xf8, 0x3f, 0x2, 0xc0, 0x0, 0xf6, 0x8e, 0x0, 0x0, 0x4, 0x1, 0xf7, 0x4 },
{ 0xc0, 0x80, 0xc9, 0xab, 0x0, 0xeb, 0x40, 0xb5, 0xf6, 0x0, 0x1, 0x3, 0x1, 0x6a, 0x6 },
{ 0xc, 0x0, 0xd8, 0xa6, 0x0, 0x0, 0x0, 0xd6, 0x4f, 0x0, 0x1, 0x3, 0x1, 0x6c, 0x5 },
{ 0x1, 0x0, 0xe2, 0xd2, 0x0, 0x3, 0x41, 0x8f, 0x48, 0x49, 0xc, 0x4, 0x1, 0x2f, 0x5 },
{ 0x0, 0x0, 0xc8, 0x58, 0x3, 0x0, 0x0, 0xf6, 0x4f, 0x0, 0x9, 0x3, 0x1, 0x108, 0x4 },
{ 0x1, 0x0, 0xff, 0x5, 0x0, 0xf2, 0xff, 0xe0, 0x50, 0x52, 0x5d, 0x2, 0x1, 0x9f, 0x5 },
{ 0xe, 0x9, 0xb9, 0x47, 0x0, 0xeb, 0x40, 0xf5, 0xe6, 0x0, 0x0, 0x0, 0x1, 0x82, 0x6 },
{ 0x0, 0x0, 0xd6, 0x83, 0x0, 0xd6, 0xd7, 0xe0, 0x41, 0x5e, 0x4a, 0x2, 0x1, 0xc7, 0x5 },
{ 0x1, 0x9, 0x89, 0x67, 0x0, 0xd6, 0xd7, 0xe0, 0x41, 0x5e, 0x4a, 0x0, 0x1, 0x80, 0x6 },
{ 0x1, 0x0, 0xd6, 0x96, 0x0, 0xd6, 0xd7, 0xe0, 0x41, 0x5e, 0x4a, 0x2, 0x1, 0xed, 0x5 },
{ 0x0, 0x9, 0xa9, 0x55, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x82, 0x6 },
{ 0x2, 0x0, 0xc6, 0x96, 0x0, 0xe0, 0x0, 0xe0, 0x40, 0x0, 0x1, 0x2, 0x1, 0x123, 0x5 },
{ 0x5, 0x0, 0xf6, 0x56, 0x0, 0xf7, 0xff, 0xb3, 0x90, 0x4f, 0x1, 0x2, 0x1, 0x15b, 0x5 },
{ 0x1, 0x0, 0xf7, 0x14, 0x0, 0xf7, 0xff, 0x36, 0x90, 0x79, 0xe7, 0x1, 0x1, 0x1ac, 0x5 },
{ 0x0, 0x0, 0xf6, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x1, 0x2, 0x1, 0x18b, 0x5 },
{ 0x0, 0x83, 0xfb, 0x5, 0x0, 0xf7, 0x41, 0x39, 0x90, 0x79, 0x1, 0x1, 0x1, 0xc8, 0x5 },
{ 0x0, 0x0, 0xff, 0x5, 0x0, 0xf7, 0xff, 0x36, 0x90, 0x79, 0xe7, 0x1, 0x1, 0xf9, 0x5 },
{ 0x1, 0x0, 0xa0, 0x5, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x1, 0x27a, 0x6 },
{ 0x0, 0x5, 0xf3, 0x6, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x1, 0x108, 0x7 },
{ 0x1, 0x0, 0xf9, 0x34, 0x0, 0xf7, 0xff, 0x36, 0x90, 0x79, 0xe7, 0x1, 0x1, 0x147, 0x4 },
{ 0x0, 0x0, 0xf7, 0x16, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x2, 0x1, 0x120, 0x6 },
{ 0x1, 0x0, 0xff, 0x5, 0x0, 0xf7, 0xff, 0x36, 0x90, 0x79, 0xe7, 0x1, 0x1, 0x42, 0x6 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x1, 0x0, 0xff, 0x5, 0x0, 0xf7, 0xff, 0x36, 0x90, 0x79, 0xe7, 0x1, 0x1, 0x6d, 0x5 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 },
{ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3fc, 0x4 }
};
/**********************************
low-level OPL manipulation
*/
#define NUM_VOICES 9 // the driver only uses rhythm mode, so there are 9 FM voices available
#define NUM_MELODIC_VOICES 6 // adlib FM voices 0-5 (2 operators each)
#define NUM_PERCUSSIONS 5 // adlib FM voice 6 (2 operators), and voices 7-8 (1 operator each)
struct MelodicVoice {
int8 key; // the note being played
int8 program; // the midi instrument? (see voice)
int8 channel; // the midi channel
int32 timestamp;
uint16 fnumber; // frequency id (see lookup table)
int8 octave;
bool in_use;
} melodic[NUM_MELODIC_VOICES];
// notes being currently played for each percussion (0xFF if none)
uint8 notes_per_percussion[NUM_PERCUSSIONS];
uint8 operator_offsets_for_percussion[] = {
0x11, // hi-hat operator [channel 7, operator 1]
0x15, // cymbal operator [channel 8, operator 2]
0x12, // tom tom operator [channel 8, operator 1]
0x14 // snare drum operator [channel 7, operator 1]
// 0x10 // bass drum [channel 6, operator 1]
// 0x13 // bass drum [channel 6, operator 2]
};
uint8 operator1_offset_for_melodic[NUM_VOICES] = {
0x0, 0x1, 0x2, 0x8, 0x9, 0xa, 0x10, 0x11, 0x12
};
uint8 operator2_offset_for_melodic[NUM_VOICES] = {
0x3, 0x4, 0x5, 0xb, 0xc, 0xd, 0x13, 0x14, 0x15
};
uint16 melodic_fnumbers[36] = {
0x55, 0x5a, 0x60, 0x66, 0x6c, 0x72, 0x79, 0x80, 0x88,
0x90, 0x99, 0xa1, 0xab, 0xb5, 0xc0, 0xcc, 0xd8, 0xe5,
0xf2, 0x101, 0x110, 0x120, 0x132, 0x143, 0x156, 0x16b, 0x181,
0x198, 0x1b0, 0x1ca, 0x1e5, 0x202, 0x220, 0x241, 0x263, 0x286
};
/*
bit 7 - Clear: AM depth is 1 dB
bit 6 - Clear: Vibrato depth is 7 cent
bit 5 - Set: Rhythm enabled (6 melodic voices)
bit 4 - Bass drum off
bit 3 - Snare drum off
bit 2 - Tom tom off
bit 1 - Cymbal off
bit 0 - Hi Hat off
*/
#define ADLIB_DEFAULT_PERCUSSION_MASK 0x20
uint8 driver_percussion_mask;
int32 driver_timestamp;
uint8 driver_assigned_voice; // last voice assigned to a channel
/*
* bit 7-6: unused
* bit 5 : key on (0 mutes voice)
* bits 4-2: octave
* bits 1-0: higher 2 bits of f-number
*/
#define ADLIB_B0(key_on,octave,fnumber) ( ((key_on) & 0x10) | ((octave) & 7) | ((fnumber) & 3) )
#define ADLIB_A0(fnumber) (fnumber)
#define ADLIB_40(scaling,total) ( ((scaling) & 0xC0) | ((total_level) & 0x3F) )
#define INC_MOD(n,max) ((n+1) % max)
// the maximum volume value in the hardware and its bitmask
#define MAXIMUM_LEVEL 63
#define LEVEL_MASK 0x3F // 63
#define PITCH_BEND_THRESH 8192
uint32 ADLIB_log_volume[129];
uint8 calc_level(uint8 velocity, uint8 program_level, uint8 midi_channel) {
/* combines note, program and channel levels, then scales it down to fit the six bits available in
the hardware. The result is subtracted from MAXIMUM_LEVEL as the hardware's logic is
reversed. See http://www.shipbrook.com/jeff/sb.html#40-55.
*/
uint32 note_level = ADLIB_log_volume[velocity];
uint32 channel_level = ADLIB_log_volume[midi_channels[midi_channel].volume];
// program_level comes from the static data and is probably already in the correct logarithmic scale
return MAXIMUM_LEVEL - ((note_level * channel_level * program_level) >> 16);
}
void ADLIB_play_note(uint8 voice, uint8 octave, uint16 fnumber);
void ADLIB_play_melodic_note(uint8 voice);
void ADLIB_mute_melodic_voice(uint8 voice);
void ADLIB_program_melodic_voice(uint8 voice, uint8 program);
void ADLIB_turn_on_melodic();
void ADLIB_play_percussion(PercussionNote *note, uint8 velocity);
void ADLIB_setup_percussion(PercussionNote *note);
void ADLIB_onoff_percussion(bool onoff);
void ADLIB_out(uint8 command, uint8 value);
/* turn off all the voices and restore base octave and (hi) frequency */
void ADLIB_mute_voices() {
// turn off melodic voices
for (int i = 0; i < NUM_MELODIC_VOICES; ++i) {
ADLIB_mute_melodic_voice(i);
}
// turn off percussions
ADLIB_out(0xBD, ADLIB_DEFAULT_PERCUSSION_MASK);
}
void ADLIB_init_voices() {
for (int i = 0; i < NUM_MIDI_CHANNELS; ++i) {
midi_channels[i].program = 0;
midi_channels[i].volume = 127;
midi_channels[i].pedal = 0;
}
for (int i = 0; i < NUM_MELODIC_VOICES; ++i) {
melodic[i].key = -1;
melodic[i].program = -1;
melodic[i].channel = -1;
melodic[i].timestamp = 0;
melodic[i].fnumber = 0;
melodic[i].octave = 0;
melodic[i].in_use = false;
}
// clear out current percussion notes
memset(notes_per_percussion, 5, 0xFF);
driver_assigned_voice = 0;
driver_timestamp = 0;
driver_percussion_mask = ADLIB_DEFAULT_PERCUSSION_MASK;
ADLIB_out(0xBD, driver_percussion_mask);
}
void ADLIB_turn_off_voice() {
if (midi_event_channel == 9) {
ADLIB_onoff_percussion(false);
} else {
uint8 voice; // left uninitialized !
if (midi_channels[midi_event_channel].pedal == 0) {
voice = 0xFF; // used below as a flag
}
for (int i = 0; i < NUM_MELODIC_VOICES; ++i) {
if (melodic[i].key == midi_onoff_note && melodic[i].channel == midi_event_channel) {
voice = i;
}
}
if (voice != 0xFF) {
// mute the channel
ADLIB_mute_melodic_voice(voice);
}
}
}
void ADLIB_turn_on_voice() {
if (midi_event_channel == 9) {
ADLIB_onoff_percussion(midi_onoff_velocity != 0);
} else {
if (midi_onoff_velocity == 0) {
ADLIB_turn_off_voice();
} else {
ADLIB_turn_on_melodic();
}
}
}
void ADLIB_onoff_percussion(bool onoff) {
if (midi_onoff_note < 35 || midi_onoff_note > 81) {
return;
}
PercussionNote *note = &percussion_notes[midi_onoff_note - 35];
if (onoff) {
if (note->valid == 0) {
return;
}
if (midi_onoff_note != notes_per_percussion[note->percussion]) {
ADLIB_setup_percussion(note);
notes_per_percussion[note->percussion] = midi_onoff_note;
}
ADLIB_play_percussion(note, midi_onoff_velocity);
} else {
driver_percussion_mask &= ~(1 << note->percussion);
}
}
void ADLIB_program_operator(uint8 operator_offset, OplOperator *data) {
ADLIB_out(0x20 + operator_offset, data->characteristic);
ADLIB_out(0x60 + operator_offset, data->attack_decay);
ADLIB_out(0x80 + operator_offset, data->sustain_release);
ADLIB_out(0x40 + operator_offset, data->levels);
ADLIB_out(0xE0 + operator_offset, data->waveform);
}
void ADLIB_program_operator_s(uint8 operator_offset, OplOperator *data) {
ADLIB_out(0x40 + operator_offset, data->levels & LEVEL_MASK);
ADLIB_out(0x60 + operator_offset, data->attack_decay);
ADLIB_out(0x80 + operator_offset, data->sustain_release);
}
void ADLIB_set_operator_level(uint8 operator_offset, OplOperator *data, uint8 velocity, uint8 midi_channel, bool full_volume) {
uint8 scaling_level = data->levels;
uint8 program_level = MAXIMUM_LEVEL - (full_volume ? 0 : (data->levels & LEVEL_MASK));
uint8 total_level = calc_level(velocity, program_level, midi_channel);
ADLIB_out(0x40 + operator_offset, ADLIB_40(scaling_level, total_level));
}
void ADLIB_setup_percussion(PercussionNote *note) {
if (note->percussion < 4) {
// simple percussions (1 operator)
driver_percussion_mask &= ~(1 << note->percussion);
ADLIB_out(0xBD, driver_percussion_mask);
uint8 offset = operator_offsets_for_percussion[note->percussion];
ADLIB_program_operator_s(offset, ¬e->op[0]);
} else {
// bass drum (2 operators)
driver_percussion_mask &= ~(0x10);
ADLIB_out(0xBD, driver_percussion_mask);
ADLIB_program_operator(0x10, ¬e->op[0]);
ADLIB_program_operator(0x13, ¬e->op[1]);
// feedback / algorithm
uint8 voice = 6;
ADLIB_out(0xC0 + voice, note->feedback_algo);
}
}
void ADLIB_play_percussion(PercussionNote *note, uint8 velocity) {
if (note->percussion < 4) {
// simple percussion (1 operator)
driver_percussion_mask &= ~(1 << note->percussion);
ADLIB_out(0xBD, driver_percussion_mask);
ADLIB_set_operator_level(operator_offsets_for_percussion[note->percussion], ¬e->op[0], velocity, midi_event_channel, true);
if (note->percussion == 2) {
// tom tom operator [channel 8, operator 1]
ADLIB_play_note(8, note->octave, note->fnumber);
} else
if (note->percussion == 3) {
// snare drum operator [channel 7, operator 1]
ADLIB_play_note(7, note->octave, note->fnumber);
}
driver_percussion_mask |= (1 << note->percussion);
ADLIB_out(0xBD, driver_percussion_mask);
} else {
// bass drum (2 operators)
driver_percussion_mask &= ~(0x10);
ADLIB_out(0xBD, driver_percussion_mask);
if (note->feedback_algo & 1) {
// operators 1 and 2 in additive synthesis
ADLIB_set_operator_level(0x10, ¬e->op[0], velocity, midi_event_channel, true);
ADLIB_set_operator_level(0x13, ¬e->op[1], velocity, midi_event_channel, true);
} else {
// operator 2 is modulating operator 1
ADLIB_set_operator_level(0x13, ¬e->op[1], velocity, midi_event_channel, true);
}
ADLIB_play_note(6, note->octave, note->fnumber);
driver_percussion_mask |= 0x10;
ADLIB_out(0xBD, driver_percussion_mask);
}
}
void ADLIB_turn_on_melodic() {
// ideal: look for a melodic voice playing the same note with the same program
for (int i = 0; i < NUM_MELODIC_VOICES; ++i) {
if (melodic[i].channel == midi_event_channel &&
melodic[i].program == midi_channels[midi_event_channel].program &&
melodic[i].key == midi_onoff_note) {
ADLIB_mute_melodic_voice(i);
ADLIB_play_melodic_note(i);
return;
}
}
// fallback 1: look for a free melodic voice with the same program
uint8 voice = driver_assigned_voice;
do {
driver_assigned_voice = INC_MOD(driver_assigned_voice, NUM_MELODIC_VOICES);
if (!melodic[driver_assigned_voice].in_use) {
continue;
}
if (midi_channels[midi_event_channel].program == melodic[driver_assigned_voice].program) {
ADLIB_play_melodic_note(driver_assigned_voice);
return;
}
} while (driver_assigned_voice != voice);
// fallback 2: look for a free melodic voice
do {
driver_assigned_voice = INC_MOD(driver_assigned_voice, NUM_MELODIC_VOICES);
if (!melodic[driver_assigned_voice].in_use) {
ADLIB_program_melodic_voice(driver_assigned_voice, midi_channels[midi_event_channel].program);
ADLIB_play_melodic_note(driver_assigned_voice);
return;
}
} while (voice != driver_assigned_voice);
// last attempt: look for any voice with the same program
driver_assigned_voice = voice;
do {
driver_assigned_voice = INC_MOD(driver_assigned_voice, NUM_MELODIC_VOICES);
if (midi_channels[midi_event_channel].program == melodic[driver_assigned_voice].program) {
ADLIB_mute_melodic_voice(driver_assigned_voice);
ADLIB_play_melodic_note(driver_assigned_voice);
return;
}
} while (voice != driver_assigned_voice);
// forget the good manners and take possession of the voice with the oldest timestamp
int32 min_timestamp = 0x7FFFFFFF;
for (int i = 0; i < NUM_MELODIC_VOICES; ++i) {
if (melodic[i].timestamp < min_timestamp) {
min_timestamp = melodic[i].timestamp;
driver_assigned_voice = i;
}
}
ADLIB_program_melodic_voice(driver_assigned_voice, midi_channels[midi_event_channel].program);
ADLIB_play_melodic_note(driver_assigned_voice);
}
void ADLIB_program_melodic_voice(uint8 voice, uint8 program) {
// the original decreases channel by one, but we are already counting from 0
MelodicProgram *prg = &melodic_programs[program];
uint8 offset1 = operator1_offset_for_melodic[voice];
uint8 offset2 = operator2_offset_for_melodic[voice];
ADLIB_out(0x40 + offset1, MAXIMUM_LEVEL);
ADLIB_out(0x40 + offset2, MAXIMUM_LEVEL);
ADLIB_mute_melodic_voice(voice);
ADLIB_program_operator(offset1, &prg->op[0]);
ADLIB_program_operator(offset2, &prg->op[1]);
// feedback / algorithm
ADLIB_out(0xC0 + voice, prg->feedback_algo);
}
void ADLIB_mute_melodic_voice(uint8 voice) {
ADLIB_out(0xB0 + voice, ADLIB_B0(0, melodic[voice].octave << 2, melodic[voice].fnumber >> 8));
}
void ADLIB_play_melodic_note(uint8 voice) {
uint8 octave = midi_onoff_note / 12;
uint8 f = 12 + (midi_onoff_note % 12);
if (octave > 7) {
octave = 7;
}
uint8 program = midi_channels[midi_event_channel].program;
MelodicProgram *prg = &melodic_programs[program];
if (1 & melodic_programs[program].feedback_algo) {
ADLIB_set_operator_level(operator1_offset_for_melodic[voice], &prg->op[0], midi_onoff_velocity, midi_event_channel, false);
ADLIB_set_operator_level(operator2_offset_for_melodic[voice], &prg->op[1], midi_onoff_velocity, midi_event_channel, false);
} else {
ADLIB_set_operator_level(operator2_offset_for_melodic[voice], &prg->op[1], midi_onoff_velocity, midi_event_channel, true);
}
ADLIB_play_note(voice, octave, melodic_fnumbers[f]);
melodic[voice].program = program;
melodic[voice].key = midi_onoff_note;
melodic[voice].channel = midi_event_channel;
melodic[voice].timestamp = driver_timestamp;
melodic[voice].fnumber = melodic_fnumbers[f];
melodic[voice].octave = octave;
melodic[voice].in_use = true;
}
void ADLIB_play_note(uint8 voice, uint8 octave, uint16 fnumber) {
/* Percussions are always fed keyOn = 0 even to set the note, as they are activated using the
BD register instead. I wonder if they can just be fed the same value as melodic voice and
be done with it. */
uint8 keyOn = (voice < NUM_MELODIC_VOICES) ? 0x20 : 0;
ADLIB_out(0xB0 + voice, ADLIB_B0(keyOn, octave << 2, fnumber >> 8));
ADLIB_out(0xA0 + voice, fnumber & 0xFF);
}
void ADLIB_pitch_bend(int amount, uint8 midi_channel) {