-
Notifications
You must be signed in to change notification settings - Fork 1
/
Copy pathpokeysnd.c
1225 lines (1097 loc) · 38.8 KB
/
pokeysnd.c
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
/*
* pokeysnd.c - POKEY sound chip emulation, v2.4
*
* Copyright (C) 1996-1998 Ron Fries
* Copyright (C) 1998-2008 Atari800 development team (see DOC/CREDITS)
*
* This file is part of the Atari800 emulator project which emulates
* the Atari 400, 800, 800XL, 130XE, and 5200 8-bit computers.
*
* Atari800 is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Atari800 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Atari800; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#ifdef ASAP /* external project, see http://asap.sf.net */
#include "asap_internal.h"
#else
#include "atari.h"
#ifndef __PLUS
#include "sndsave.h"
#else
#include "sound_win.h"
#endif
#endif
#include "mzpokeysnd.h"
#include "pokeysnd.h"
#ifdef PBI_XLD
#include "pbi_xld.h"
#endif
#include "antic.h"
#include "gtia.h"
#ifdef WORDS_UNALIGNED_OK
# define READ_U32(x) (*(ULONG *) (x))
# define WRITE_U32(x, d) (*(ULONG *) (x) = (d))
#else
# ifdef WORDS_BIGENDIAN
# define READ_U32(x) (((*(unsigned char *)(x)) << 24) | ((*((unsigned char *)(x) + 1)) << 16) | \
((*((unsigned char *)(x) + 2)) << 8) | ((*((unsigned char *)(x) + 3))))
# define WRITE_U32(x, d) \
{ \
ULONG i = d; \
(*(unsigned char *) (x)) = (((i) >> 24) & 255); \
(*((unsigned char *) (x) + 1)) = (((i) >> 16) & 255); \
(*((unsigned char *) (x) + 2)) = (((i) >> 8) & 255); \
(*((unsigned char *) (x) + 3)) = ((i) & 255); \
}
# else
# define READ_U32(x) ((*(unsigned char *) (x)) | ((*((unsigned char *) (x) + 1)) << 8) | \
((*((unsigned char *) (x) + 2)) << 16) | ((*((unsigned char *) (x) + 3)) << 24))
# define WRITE_U32(x, d) \
{ \
ULONG i = d; \
(*(unsigned char *)(x)) = ((i) & 255); \
(*((unsigned char *)(x) + 1)) = (((i) >> 8) & 255); \
(*((unsigned char *)(x) + 2)) = (((i) >> 16) & 255); \
(*((unsigned char *)(x) + 3)) = (((i) >> 24) & 255); \
}
# endif
#endif
/* GLOBAL VARIABLE DEFINITIONS */
/* number of pokey chips currently emulated */
static UBYTE Num_pokeys;
static UBYTE pokeysnd_AUDV[4 * POKEY_MAXPOKEYS]; /* Channel volume - derived */
static UBYTE Outbit[4 * POKEY_MAXPOKEYS]; /* current state of the output (high or low) */
static UBYTE Outvol[4 * POKEY_MAXPOKEYS]; /* last output volume for each channel */
/* Initialize the bit patterns for the polynomials. */
/* The 4bit and 5bit patterns are the identical ones used in the pokey chip. */
/* Though the patterns could be packed with 8 bits per byte, using only a */
/* single bit per byte keeps the math simple, which is important for */
/* efficient processing. */
static UBYTE bit4[POKEY_POLY4_SIZE] =
#ifndef POKEY23_POLY
{1, 1, 1, 1, 0, 0, 0, 1, 0, 0, 1, 1, 0, 1, 0}; /* new table invented by Perry */
#else
{1, 1, 0, 1, 1, 1, 0, 0, 0, 0, 1, 0, 1, 0, 0}; /* original POKEY 2.3 table */
#endif
static UBYTE bit5[POKEY_POLY5_SIZE] =
#ifndef POKEY23_POLY
{1, 1, 1, 1, 0, 1, 1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0};
#else
{0, 0, 1, 1, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 0, 0, 0, 0, 0, 1};
#endif
static ULONG P4 = 0, /* Global position pointer for the 4-bit POLY array */
P5 = 0, /* Global position pointer for the 5-bit POLY array */
P9 = 0, /* Global position pointer for the 9-bit POLY array */
P17 = 0; /* Global position pointer for the 17-bit POLY array */
static ULONG Div_n_cnt[4 * POKEY_MAXPOKEYS], /* Divide by n counter. one for each channel */
Div_n_max[4 * POKEY_MAXPOKEYS]; /* Divide by n maximum, one for each channel */
static ULONG Samp_n_max, /* Sample max. For accuracy, it is *256 */
Samp_n_cnt[2]; /* Sample cnt. */
#ifdef INTERPOLATE_SOUND
static UWORD last_val = 0; /* last output value */
#ifdef STEREO_SOUND
static UWORD last_val2 = 0; /* last output value */
#endif
#endif
/* Volume only emulations declarations */
#ifdef VOL_ONLY_SOUND
int POKEYSND_sampbuf_val[POKEYSND_SAMPBUF_MAX]; /* volume values */
int POKEYSND_sampbuf_cnt[POKEYSND_SAMPBUF_MAX]; /* relative start time */
int POKEYSND_sampbuf_ptr = 0; /* pointer to sampbuf */
int POKEYSND_sampbuf_rptr = 0; /* pointer to read from sampbuf */
int POKEYSND_sampbuf_last = 0; /* last absolute time */
int POKEYSND_sampbuf_AUDV[4 * POKEY_MAXPOKEYS]; /* prev. channel volume */
int POKEYSND_sampbuf_lastval = 0; /* last volume */
int POKEYSND_sampout; /* last out volume */
int POKEYSND_samp_freq;
int POKEYSND_samp_consol_val = 0; /* actual value of console sound */
#ifdef STEREO_SOUND
static int sampbuf_val2[POKEYSND_SAMPBUF_MAX]; /* volume values */
static int sampbuf_cnt2[POKEYSND_SAMPBUF_MAX]; /* relative start time */
static int sampbuf_ptr2 = 0; /* pointer to sampbuf */
static int sampbuf_rptr2 = 0; /* pointer to read from sampbuf */
static int sampbuf_last2 = 0; /* last absolute time */
static int sampbuf_lastval2 = 0; /* last volume */
static int sampout2; /* last out volume */
#endif
#endif /* VOL_ONLY_SOUND */
static ULONG snd_freq17 = POKEYSND_FREQ_17_EXACT;
int POKEYSND_playback_freq = 44100;
UBYTE POKEYSND_num_pokeys = 1;
int POKEYSND_snd_flags = 0;
static int mz_quality = 0; /* default quality for mzpokeysnd */
#ifdef __PLUS
int mz_clear_regs = 0;
#endif
int POKEYSND_enable_new_pokey = TRUE;
int POKEYSND_bienias_fix = TRUE; /* when TRUE, high frequencies get emulated: better sound but slower */
#if defined(__PLUS) && !defined(_WX_)
#define BIENIAS_FIX (g_Sound.nBieniasFix)
#else
#define BIENIAS_FIX POKEYSND_bienias_fix
#endif
#ifndef ASAP
int POKEYSND_stereo_enabled = FALSE;
#endif
/* multiple sound engine interface */
static void pokeysnd_process_8(void *sndbuffer, int sndn);
static void pokeysnd_process_16(void *sndbuffer, int sndn);
static void null_pokey_process(void *sndbuffer, int sndn) {}
void (*POKEYSND_Process_ptr)(void *sndbuffer, int sndn) = null_pokey_process;
static void Update_pokey_sound_rf(UWORD, UBYTE, UBYTE, UBYTE);
static void null_pokey_sound(UWORD addr, UBYTE val, UBYTE chip, UBYTE gain) {}
void (*POKEYSND_Update) (UWORD addr, UBYTE val, UBYTE chip, UBYTE gain)
= null_pokey_sound;
#ifdef SERIO_SOUND
static void Update_serio_sound_rf(int out, UBYTE data);
static void null_serio_sound(int out, UBYTE data) {}
void (*POKEYSND_UpdateSerio)(int out, UBYTE data) = null_serio_sound;
int POKEYSND_serio_sound_enabled = 1;
#endif
#ifdef CONSOLE_SOUND
static void Update_consol_sound_rf(int set);
static void null_consol_sound(int set) {}
void (*POKEYSND_UpdateConsol)(int set) = null_consol_sound;
int POKEYSND_console_sound_enabled = 1;
#endif
#ifdef VOL_ONLY_SOUND
static void Update_vol_only_sound_rf(void);
static void null_vol_only_sound(void) {}
void (*POKEYSND_UpdateVolOnly)(void) = null_vol_only_sound;
#endif
/*****************************************************************************/
/* In my routines, I treat the sample output as another divide by N counter */
/* For better accuracy, the Samp_n_cnt has a fixed binary decimal point */
/* which has 8 binary digits to the right of the decimal point. I use a two */
/* byte array to give me a minimum of 40 bits, and then use pointer math to */
/* reference either the 24.8 whole/fraction combination or the 32-bit whole */
/* only number. This is mainly used to keep the math simple for */
/* optimization. See below: */
/* */
/* Representation on little-endian machines: */
/* xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx */
/* fraction whole whole whole whole unused unused unused */
/* */
/* Samp_n_cnt[0] gives me a 32-bit int 24 whole bits with 8 fractional bits, */
/* while (ULONG *)((UBYTE *)(&Samp_n_cnt[0])+1) gives me the 32-bit whole */
/* number only. */
/* */
/* Representation on big-endian machines: */
/* xxxxxxxx xxxxxxxx xxxxxxxx xxxxxxxx | xxxxxxxx xxxxxxxx xxxxxxxx.xxxxxxxx */
/* unused unused unused whole whole whole whole fraction */
/* */
/* Samp_n_cnt[1] gives me a 32-bit int 24 whole bits with 8 fractional bits, */
/* while (ULONG *)((UBYTE *)(&Samp_n_cnt[0])+3) gives me the 32-bit whole */
/* number only. */
/*****************************************************************************/
/*****************************************************************************/
/* Module: pokeysnd_init_rf() */
/* Purpose: to handle the power-up initialization functions */
/* these functions should only be executed on a cold-restart */
/* */
/* Author: Ron Fries */
/* Date: January 1, 1997 */
/* */
/* Inputs: freq17 - the value for the '1.79MHz' Pokey audio clock */
/* playback_freq - the playback frequency in samples per second */
/* num_pokeys - specifies the number of pokey chips to be emulated */
/* */
/* Outputs: Adjusts local globals - no return value */
/* */
/*****************************************************************************/
static int pokeysnd_init_rf(ULONG freq17, int playback_freq,
UBYTE num_pokeys, int flags);
int POKEYSND_DoInit(void)
{
SndSave_CloseSoundFile();
if (POKEYSND_enable_new_pokey)
return MZPOKEYSND_Init(snd_freq17, POKEYSND_playback_freq,
POKEYSND_num_pokeys, POKEYSND_snd_flags, mz_quality
#ifdef __PLUS
, mz_clear_regs
#endif
);
else
return pokeysnd_init_rf(snd_freq17, POKEYSND_playback_freq,
POKEYSND_num_pokeys, POKEYSND_snd_flags);
}
int POKEYSND_Init(ULONG freq17, int playback_freq, UBYTE num_pokeys,
int flags
#ifdef __PLUS
, int clear_regs
#endif
)
{
snd_freq17 = freq17;
POKEYSND_playback_freq = playback_freq;
POKEYSND_num_pokeys = num_pokeys;
POKEYSND_snd_flags = flags;
#ifdef __PLUS
mz_clear_regs = clear_regs;
#endif
#ifdef PBI_XLD
PBI_XLD_VInit(playback_freq, num_pokeys, (flags & POKEYSND_BIT16));
#endif
return POKEYSND_DoInit();
}
void POKEYSND_SetMzQuality(int quality) /* specially for win32, perhaps not needed? */
{
mz_quality = quality;
}
void POKEYSND_Process(void *sndbuffer, int sndn)
{
POKEYSND_Process_ptr(sndbuffer, sndn);
#ifdef PBI_XLD
PBI_XLD_VProcess(sndbuffer,sndn);
#endif
#if !defined(__PLUS) && !defined(ASAP)
SndSave_WriteToSoundFile((const unsigned char *)sndbuffer, sndn);
#endif
}
static int pokeysnd_init_rf(ULONG freq17, int playback_freq,
UBYTE num_pokeys, int flags)
{
UBYTE chan;
POKEYSND_Update = Update_pokey_sound_rf;
#ifdef SERIO_SOUND
POKEYSND_UpdateSerio = Update_serio_sound_rf;
#endif
#ifdef CONSOLE_SOUND
POKEYSND_UpdateConsol = Update_consol_sound_rf;
#endif
#ifdef VOL_ONLY_SOUND
POKEYSND_UpdateVolOnly = Update_vol_only_sound_rf;
#endif
POKEYSND_Process_ptr = (flags & POKEYSND_BIT16) ? pokeysnd_process_16 : pokeysnd_process_8;
#ifdef VOL_ONLY_SOUND
POKEYSND_samp_freq = playback_freq;
#endif
/* start all of the polynomial counters at zero */
P4 = 0;
P5 = 0;
P9 = 0;
P17 = 0;
/* calculate the sample 'divide by N' value based on the playback freq. */
Samp_n_max = ((ULONG) freq17 << 8) / playback_freq;
Samp_n_cnt[0] = 0; /* initialize all bits of the sample */
Samp_n_cnt[1] = 0; /* 'divide by N' counter */
for (chan = 0; chan < (POKEY_MAXPOKEYS * 4); chan++) {
Outvol[chan] = 0;
Outbit[chan] = 0;
Div_n_cnt[chan] = 0;
Div_n_max[chan] = 0x7fffffffL;
pokeysnd_AUDV[chan] = 0;
#ifdef VOL_ONLY_SOUND
POKEYSND_sampbuf_AUDV[chan] = 0;
#endif
}
/* set the number of pokey chips currently emulated */
Num_pokeys = num_pokeys;
return 0; /* OK */
}
/*****************************************************************************/
/* Module: Update_pokey_sound_rf() */
/* Purpose: To process the latest control values stored in the AUDF, AUDC, */
/* and AUDCTL registers. It pre-calculates as much information as */
/* possible for better performance. This routine has not been */
/* optimized. */
/* */
/* Author: Ron Fries */
/* Date: January 1, 1997 */
/* */
/* Inputs: addr - the address of the parameter to be changed */
/* val - the new value to be placed in the specified address */
/* gain - specified as an 8-bit fixed point number - use 1 for no */
/* amplification (output is multiplied by gain) */
/* */
/* Outputs: Adjusts local globals - no return value */
/* */
/*****************************************************************************/
static void Update_pokey_sound_rf(UWORD addr, UBYTE val, UBYTE chip,
UBYTE gain)
{
ULONG new_val = 0;
UBYTE chan;
UBYTE chan_mask;
UBYTE chip_offs;
/* calculate the chip_offs for the channel arrays */
chip_offs = chip << 2;
/* determine which address was changed */
switch (addr & 0x0f) {
case POKEY_OFFSET_AUDF1:
/* POKEY_AUDF[POKEY_CHAN1 + chip_offs] = val; */
chan_mask = 1 << POKEY_CHAN1;
if (POKEY_AUDCTL[chip] & POKEY_CH1_CH2) /* if ch 1&2 tied together */
chan_mask |= 1 << POKEY_CHAN2; /* then also change on ch2 */
break;
case POKEY_OFFSET_AUDC1:
/* POKEY_AUDC[POKEY_CHAN1 + chip_offs] = val; */
pokeysnd_AUDV[POKEY_CHAN1 + chip_offs] = (val & POKEY_VOLUME_MASK) * gain;
chan_mask = 1 << POKEY_CHAN1;
break;
case POKEY_OFFSET_AUDF2:
/* POKEY_AUDF[POKEY_CHAN2 + chip_offs] = val; */
chan_mask = 1 << POKEY_CHAN2;
break;
case POKEY_OFFSET_AUDC2:
/* POKEY_AUDC[POKEY_CHAN2 + chip_offs] = val; */
pokeysnd_AUDV[POKEY_CHAN2 + chip_offs] = (val & POKEY_VOLUME_MASK) * gain;
chan_mask = 1 << POKEY_CHAN2;
break;
case POKEY_OFFSET_AUDF3:
/* POKEY_AUDF[POKEY_CHAN3 + chip_offs] = val; */
chan_mask = 1 << POKEY_CHAN3;
if (POKEY_AUDCTL[chip] & POKEY_CH3_CH4) /* if ch 3&4 tied together */
chan_mask |= 1 << POKEY_CHAN4; /* then also change on ch4 */
break;
case POKEY_OFFSET_AUDC3:
/* POKEY_AUDC[POKEY_CHAN3 + chip_offs] = val; */
pokeysnd_AUDV[POKEY_CHAN3 + chip_offs] = (val & POKEY_VOLUME_MASK) * gain;
chan_mask = 1 << POKEY_CHAN3;
break;
case POKEY_OFFSET_AUDF4:
/* POKEY_AUDF[POKEY_CHAN4 + chip_offs] = val; */
chan_mask = 1 << POKEY_CHAN4;
break;
case POKEY_OFFSET_AUDC4:
/* POKEY_AUDC[POKEY_CHAN4 + chip_offs] = val; */
pokeysnd_AUDV[POKEY_CHAN4 + chip_offs] = (val & POKEY_VOLUME_MASK) * gain;
chan_mask = 1 << POKEY_CHAN4;
break;
case POKEY_OFFSET_AUDCTL:
/* POKEY_AUDCTL[chip] = val; */
chan_mask = 15; /* all channels */
break;
default:
chan_mask = 0;
break;
}
/************************************************************/
/* As defined in the manual, the exact Div_n_cnt values are */
/* different depending on the frequency and resolution: */
/* 64 kHz or 15 kHz - AUDF + 1 */
/* 1 MHz, 8-bit - AUDF + 4 */
/* 1 MHz, 16-bit - POKEY_AUDF[POKEY_CHAN1]+256*POKEY_AUDF[POKEY_CHAN2] + 7 */
/************************************************************/
/* only reset the channels that have changed */
if (chan_mask & (1 << POKEY_CHAN1)) {
/* process channel 1 frequency */
if (POKEY_AUDCTL[chip] & POKEY_CH1_179)
new_val = POKEY_AUDF[POKEY_CHAN1 + chip_offs] + 4;
else
new_val = (POKEY_AUDF[POKEY_CHAN1 + chip_offs] + 1) * POKEY_Base_mult[chip];
if (new_val != Div_n_max[POKEY_CHAN1 + chip_offs]) {
Div_n_max[POKEY_CHAN1 + chip_offs] = new_val;
if (Div_n_cnt[POKEY_CHAN1 + chip_offs] > new_val) {
Div_n_cnt[POKEY_CHAN1 + chip_offs] = new_val;
}
}
}
if (chan_mask & (1 << POKEY_CHAN2)) {
/* process channel 2 frequency */
if (POKEY_AUDCTL[chip] & POKEY_CH1_CH2) {
if (POKEY_AUDCTL[chip] & POKEY_CH1_179)
new_val = POKEY_AUDF[POKEY_CHAN2 + chip_offs] * 256 +
POKEY_AUDF[POKEY_CHAN1 + chip_offs] + 7;
else
new_val = (POKEY_AUDF[POKEY_CHAN2 + chip_offs] * 256 +
POKEY_AUDF[POKEY_CHAN1 + chip_offs] + 1) * POKEY_Base_mult[chip];
}
else
new_val = (POKEY_AUDF[POKEY_CHAN2 + chip_offs] + 1) * POKEY_Base_mult[chip];
if (new_val != Div_n_max[POKEY_CHAN2 + chip_offs]) {
Div_n_max[POKEY_CHAN2 + chip_offs] = new_val;
if (Div_n_cnt[POKEY_CHAN2 + chip_offs] > new_val) {
Div_n_cnt[POKEY_CHAN2 + chip_offs] = new_val;
}
}
}
if (chan_mask & (1 << POKEY_CHAN3)) {
/* process channel 3 frequency */
if (POKEY_AUDCTL[chip] & POKEY_CH3_179)
new_val = POKEY_AUDF[POKEY_CHAN3 + chip_offs] + 4;
else
new_val = (POKEY_AUDF[POKEY_CHAN3 + chip_offs] + 1) * POKEY_Base_mult[chip];
if (new_val != Div_n_max[POKEY_CHAN3 + chip_offs]) {
Div_n_max[POKEY_CHAN3 + chip_offs] = new_val;
if (Div_n_cnt[POKEY_CHAN3 + chip_offs] > new_val) {
Div_n_cnt[POKEY_CHAN3 + chip_offs] = new_val;
}
}
}
if (chan_mask & (1 << POKEY_CHAN4)) {
/* process channel 4 frequency */
if (POKEY_AUDCTL[chip] & POKEY_CH3_CH4) {
if (POKEY_AUDCTL[chip] & POKEY_CH3_179)
new_val = POKEY_AUDF[POKEY_CHAN4 + chip_offs] * 256 +
POKEY_AUDF[POKEY_CHAN3 + chip_offs] + 7;
else
new_val = (POKEY_AUDF[POKEY_CHAN4 + chip_offs] * 256 +
POKEY_AUDF[POKEY_CHAN3 + chip_offs] + 1) * POKEY_Base_mult[chip];
}
else
new_val = (POKEY_AUDF[POKEY_CHAN4 + chip_offs] + 1) * POKEY_Base_mult[chip];
if (new_val != Div_n_max[POKEY_CHAN4 + chip_offs]) {
Div_n_max[POKEY_CHAN4 + chip_offs] = new_val;
if (Div_n_cnt[POKEY_CHAN4 + chip_offs] > new_val) {
Div_n_cnt[POKEY_CHAN4 + chip_offs] = new_val;
}
}
}
/* if channel is volume only, set current output */
for (chan = POKEY_CHAN1; chan <= POKEY_CHAN4; chan++) {
if (chan_mask & (1 << chan)) {
#ifdef VOL_ONLY_SOUND
#ifdef __PLUS
if (g_Sound.nDigitized)
#endif
if ((POKEY_AUDC[chan + chip_offs] & POKEY_VOL_ONLY)) {
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled && chip & 0x01)
#else
if (chip & 0x01)
#endif
{
sampbuf_lastval2 += pokeysnd_AUDV[chan + chip_offs]
- POKEYSND_sampbuf_AUDV[chan + chip_offs];
sampbuf_val2[sampbuf_ptr2] = sampbuf_lastval2;
POKEYSND_sampbuf_AUDV[chan + chip_offs] = pokeysnd_AUDV[chan + chip_offs];
sampbuf_cnt2[sampbuf_ptr2] =
(ANTIC_CPU_CLOCK - sampbuf_last2) * 128 * POKEYSND_samp_freq / 178979;
sampbuf_last2 = ANTIC_CPU_CLOCK;
sampbuf_ptr2++;
if (sampbuf_ptr2 >= POKEYSND_SAMPBUF_MAX)
sampbuf_ptr2 = 0;
if (sampbuf_ptr2 == sampbuf_rptr2) {
sampbuf_rptr2++;
if (sampbuf_rptr2 >= POKEYSND_SAMPBUF_MAX)
sampbuf_rptr2 = 0;
}
}
else
#endif /* STEREO_SOUND */
{
POKEYSND_sampbuf_lastval += pokeysnd_AUDV[chan + chip_offs]
-POKEYSND_sampbuf_AUDV[chan + chip_offs];
POKEYSND_sampbuf_val[POKEYSND_sampbuf_ptr] = POKEYSND_sampbuf_lastval;
POKEYSND_sampbuf_AUDV[chan + chip_offs] = pokeysnd_AUDV[chan + chip_offs];
POKEYSND_sampbuf_cnt[POKEYSND_sampbuf_ptr] =
(ANTIC_CPU_CLOCK - POKEYSND_sampbuf_last) * 128 * POKEYSND_samp_freq / 178979;
POKEYSND_sampbuf_last = ANTIC_CPU_CLOCK;
POKEYSND_sampbuf_ptr++;
if (POKEYSND_sampbuf_ptr >= POKEYSND_SAMPBUF_MAX)
POKEYSND_sampbuf_ptr = 0;
if (POKEYSND_sampbuf_ptr == POKEYSND_sampbuf_rptr) {
POKEYSND_sampbuf_rptr++;
if (POKEYSND_sampbuf_rptr >= POKEYSND_SAMPBUF_MAX)
POKEYSND_sampbuf_rptr = 0;
}
}
}
#endif /* VOL_ONLY_SOUND */
/* I've disabled any frequencies that exceed the sampling
frequency. There isn't much point in processing frequencies
that the hardware can't reproduce. I've also disabled
processing if the volume is zero. */
/* if the channel is volume only */
/* or the channel is off (volume == 0) */
/* or the channel freq is greater than the playback freq */
if ( (POKEY_AUDC[chan + chip_offs] & POKEY_VOL_ONLY) ||
((POKEY_AUDC[chan + chip_offs] & POKEY_VOLUME_MASK) == 0)
|| (!BIENIAS_FIX && (Div_n_max[chan + chip_offs] < (Samp_n_max >> 8)))
) {
/* indicate the channel is 'on' */
Outvol[chan + chip_offs] = 1;
/* can only ignore channel if filtering off */
if ((chan == POKEY_CHAN3 && !(POKEY_AUDCTL[chip] & POKEY_CH1_FILTER)) ||
(chan == POKEY_CHAN4 && !(POKEY_AUDCTL[chip] & POKEY_CH2_FILTER)) ||
(chan == POKEY_CHAN1) ||
(chan == POKEY_CHAN2)
|| (!BIENIAS_FIX && (Div_n_max[chan + chip_offs] < (Samp_n_max >> 8)))
) {
/* and set channel freq to max to reduce processing */
Div_n_max[chan + chip_offs] = 0x7fffffffL;
Div_n_cnt[chan + chip_offs] = 0x7fffffffL;
}
}
}
}
/* _enable(); */ /* RSF - removed for portability 31-MAR-97 */
}
/*****************************************************************************/
/* Module: pokeysnd_process() */
/* Purpose: To fill the output buffer with the sound output based on the */
/* pokey chip parameters. */
/* */
/* Author: Ron Fries */
/* Date: January 1, 1997 */
/* */
/* Inputs: *buffer - pointer to the buffer where the audio output will */
/* be placed */
/* sndn - for mono, size of the playback buffer in samples */
/* for stereo, size of the playback buffer in left samples */
/* plus right samples. */
/* num_pokeys - number of currently active pokeys to process */
/* */
/* Outputs: the buffer will be filled with n bytes of audio - no return val */
/* Also the buffer will be written to disk if Sound recording is ON */
/* */
/*****************************************************************************/
static void pokeysnd_process_8(void *sndbuffer, int sndn)
{
register UBYTE *buffer = (UBYTE *) sndbuffer;
register int n = sndn;
register ULONG *div_n_ptr;
register UBYTE *samp_cnt_w_ptr;
register ULONG event_min;
register UBYTE next_event;
#ifdef CLIP_SOUND
register SWORD cur_val; /* then we have to count as 16-bit signed */
#ifdef STEREO_SOUND
register SWORD cur_val2;
#endif
#else /* CLIP_SOUND */
register UBYTE cur_val; /* otherwise we'll simplify as 8-bit unsigned */
#ifdef STEREO_SOUND
register UBYTE cur_val2;
#endif
#endif /* CLIP_SOUND */
register UBYTE *out_ptr;
register UBYTE audc;
register UBYTE toggle;
register UBYTE count;
register UBYTE *vol_ptr;
/* set a pointer to the whole portion of the samp_n_cnt */
#ifdef WORDS_BIGENDIAN
samp_cnt_w_ptr = ((UBYTE *) (&Samp_n_cnt[0]) + 3);
#else
samp_cnt_w_ptr = ((UBYTE *) (&Samp_n_cnt[0]) + 1);
#endif
/* set a pointer for optimization */
out_ptr = Outvol;
vol_ptr = pokeysnd_AUDV;
/* The current output is pre-determined and then adjusted based on each */
/* output change for increased performance (less over-all math). */
/* add the output values of all 4 channels */
cur_val = POKEYSND_SAMP_MIN;
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled)
#endif
cur_val2 = POKEYSND_SAMP_MIN;
#endif /* STEREO_SOUND */
count = Num_pokeys;
do {
if (*out_ptr++)
cur_val += *vol_ptr;
vol_ptr++;
if (*out_ptr++)
cur_val += *vol_ptr;
vol_ptr++;
if (*out_ptr++)
cur_val += *vol_ptr;
vol_ptr++;
if (*out_ptr++)
cur_val += *vol_ptr;
vol_ptr++;
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled)
#endif
{
count--;
if (count) {
if (*out_ptr++)
cur_val2 += *vol_ptr;
vol_ptr++;
if (*out_ptr++)
cur_val2 += *vol_ptr;
vol_ptr++;
if (*out_ptr++)
cur_val2 += *vol_ptr;
vol_ptr++;
if (*out_ptr++)
cur_val2 += *vol_ptr;
vol_ptr++;
}
else
break;
}
#endif /* STEREO_SOUND */
count--;
} while (count);
/*
#if defined (USE_DOSSOUND)
cur_val += 32 * GTIA_speaker;
#endif
*/
/* loop until the buffer is filled */
while (n) {
/* Normally the routine would simply decrement the 'div by N' */
/* counters and react when they reach zero. Since we normally */
/* won't be processing except once every 80 or so counts, */
/* I've optimized by finding the smallest count and then */
/* 'accelerated' time by adjusting all pointers by that amount. */
/* find next smallest event (either sample or chan 1-4) */
next_event = POKEY_SAMPLE;
event_min = READ_U32(samp_cnt_w_ptr);
div_n_ptr = Div_n_cnt;
count = 0;
do {
/* Though I could have used a loop here, this is faster */
if (*div_n_ptr <= event_min) {
event_min = *div_n_ptr;
next_event = POKEY_CHAN1 + (count << 2);
}
div_n_ptr++;
if (*div_n_ptr <= event_min) {
event_min = *div_n_ptr;
next_event = POKEY_CHAN2 + (count << 2);
}
div_n_ptr++;
if (*div_n_ptr <= event_min) {
event_min = *div_n_ptr;
next_event = POKEY_CHAN3 + (count << 2);
}
div_n_ptr++;
if (*div_n_ptr <= event_min) {
event_min = *div_n_ptr;
next_event = POKEY_CHAN4 + (count << 2);
}
div_n_ptr++;
count++;
} while (count < Num_pokeys);
/* if the next event is a channel change */
if (next_event != POKEY_SAMPLE) {
/* shift the polynomial counters */
count = Num_pokeys;
do {
/* decrement all counters by the smallest count found */
/* again, no loop for efficiency */
div_n_ptr--;
*div_n_ptr -= event_min;
div_n_ptr--;
*div_n_ptr -= event_min;
div_n_ptr--;
*div_n_ptr -= event_min;
div_n_ptr--;
*div_n_ptr -= event_min;
count--;
} while (count);
WRITE_U32(samp_cnt_w_ptr, READ_U32(samp_cnt_w_ptr) - event_min);
/* since the polynomials require a mod (%) function which is
division, I don't adjust the polynomials on the SAMPLE events,
only the CHAN events. I have to keep track of the change,
though. */
P4 = (P4 + event_min) % POKEY_POLY4_SIZE;
P5 = (P5 + event_min) % POKEY_POLY5_SIZE;
P9 = (P9 + event_min) % POKEY_POLY9_SIZE;
P17 = (P17 + event_min) % POKEY_POLY17_SIZE;
/* adjust channel counter */
Div_n_cnt[next_event] += Div_n_max[next_event];
/* get the current AUDC into a register (for optimization) */
audc = POKEY_AUDC[next_event];
/* set a pointer to the current output (for opt...) */
out_ptr = &Outvol[next_event];
/* assume no changes to the output */
toggle = FALSE;
/* From here, a good understanding of the hardware is required */
/* to understand what is happening. I won't be able to provide */
/* much description to explain it here. */
/* if VOLUME only then nothing to process */
if (!(audc & POKEY_VOL_ONLY)) {
/* if the output is pure or the output is poly5 and the poly5 bit */
/* is set */
if ((audc & POKEY_NOTPOLY5) || bit5[P5]) {
/* if the PURETONE bit is set */
if (audc & POKEY_PURETONE) {
/* then simply toggle the output */
toggle = TRUE;
}
/* otherwise if POLY4 is selected */
else if (audc & POKEY_POLY4) {
/* then compare to the poly4 bit */
toggle = (bit4[P4] == !(*out_ptr));
}
else {
/* if 9-bit poly is selected on this chip */
if (POKEY_AUDCTL[next_event >> 2] & POKEY_POLY9) {
/* compare to the poly9 bit */
toggle = ((POKEY_poly9_lookup[P9] & 1) == !(*out_ptr));
}
else {
/* otherwise compare to the poly17 bit */
toggle = (((POKEY_poly17_lookup[P17 >> 3] >> (P17 & 7)) & 1) == !(*out_ptr));
}
}
}
}
/* check channel 1 filter (clocked by channel 3) */
if ( POKEY_AUDCTL[next_event >> 2] & POKEY_CH1_FILTER) {
/* if we're processing channel 3 */
if ((next_event & 0x03) == POKEY_CHAN3) {
/* check output of channel 1 on same chip */
if (Outvol[next_event & 0xfd]) {
/* if on, turn it off */
Outvol[next_event & 0xfd] = 0;
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled && (next_event & 0x04))
#else
if ((next_event & 0x04))
#endif
cur_val2 -= pokeysnd_AUDV[next_event & 0xfd];
else
#endif /* STEREO_SOUND */
cur_val -= pokeysnd_AUDV[next_event & 0xfd];
}
}
}
/* check channel 2 filter (clocked by channel 4) */
if ( POKEY_AUDCTL[next_event >> 2] & POKEY_CH2_FILTER) {
/* if we're processing channel 4 */
if ((next_event & 0x03) == POKEY_CHAN4) {
/* check output of channel 2 on same chip */
if (Outvol[next_event & 0xfd]) {
/* if on, turn it off */
Outvol[next_event & 0xfd] = 0;
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled && (next_event & 0x04))
#else
if ((next_event & 0x04))
#endif
cur_val2 -= pokeysnd_AUDV[next_event & 0xfd];
else
#endif /* STEREO_SOUND */
cur_val -= pokeysnd_AUDV[next_event & 0xfd];
}
}
}
/* if the current output bit has changed */
if (toggle) {
if (*out_ptr) {
/* remove this channel from the signal */
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled && (next_event & 0x04))
#else
if ((next_event & 0x04))
#endif
cur_val2 -= pokeysnd_AUDV[next_event];
else
#endif /* STEREO_SOUND */
cur_val -= pokeysnd_AUDV[next_event];
/* and turn the output off */
*out_ptr = 0;
}
else {
/* turn the output on */
*out_ptr = 1;
/* and add it to the output signal */
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled && (next_event & 0x04))
#else
if ((next_event & 0x04))
#endif
cur_val2 += pokeysnd_AUDV[next_event];
else
#endif /* STEREO_SOUND */
cur_val += pokeysnd_AUDV[next_event];
}
}
}
else { /* otherwise we're processing a sample */
/* adjust the sample counter - note we're using the 24.8 integer
which includes an 8 bit fraction for accuracy */
int iout;
#ifdef STEREO_SOUND
int iout2;
#endif
#ifdef INTERPOLATE_SOUND
if (cur_val != last_val) {
if (*Samp_n_cnt < Samp_n_max) { /* need interpolation */
iout = (cur_val * (*Samp_n_cnt) +
last_val * (Samp_n_max - *Samp_n_cnt))
/ Samp_n_max;
}
else
iout = cur_val;
last_val = cur_val;
}
else
iout = cur_val;
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled)
#endif
if (cur_val2 != last_val2) {
if (*Samp_n_cnt < Samp_n_max) { /* need interpolation */
iout2 = (cur_val2 * (*Samp_n_cnt) +
last_val2 * (Samp_n_max - *Samp_n_cnt))
/ Samp_n_max;
}
else
iout2 = cur_val2;
last_val2 = cur_val2;
}
else
iout2 = cur_val2;
#endif /* STEREO_SOUND */
#else /* INTERPOLATE_SOUND */
iout = cur_val;
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled)
#endif
iout2 = cur_val2;
#endif /* STEREO_SOUND */
#endif /* INTERPOLATE_SOUND */
#ifdef VOL_ONLY_SOUND
#ifdef __PLUS
if (g_Sound.nDigitized)
#endif
{
if (POKEYSND_sampbuf_rptr != POKEYSND_sampbuf_ptr) {
int l;
if (POKEYSND_sampbuf_cnt[POKEYSND_sampbuf_rptr] > 0)
POKEYSND_sampbuf_cnt[POKEYSND_sampbuf_rptr] -= 1280;
while ((l = POKEYSND_sampbuf_cnt[POKEYSND_sampbuf_rptr]) <= 0) {
POKEYSND_sampout = POKEYSND_sampbuf_val[POKEYSND_sampbuf_rptr];
POKEYSND_sampbuf_rptr++;
if (POKEYSND_sampbuf_rptr >= POKEYSND_SAMPBUF_MAX)
POKEYSND_sampbuf_rptr = 0;
if (POKEYSND_sampbuf_rptr != POKEYSND_sampbuf_ptr)
POKEYSND_sampbuf_cnt[POKEYSND_sampbuf_rptr] += l;
else
break;
}
}
iout += POKEYSND_sampout;
#ifdef STEREO_SOUND
#ifdef __PLUS
if (POKEYSND_stereo_enabled)