-
Notifications
You must be signed in to change notification settings - Fork 29
/
id_sd.cpp
1423 lines (1222 loc) · 37 KB
/
id_sd.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
//
// ID Engine
// ID_SD.c - Sound Manager for Wolfenstein 3D
// v1.2
// By Jason Blochowiak
//
//
// This module handles dealing with generating sound on the appropriate
// hardware
//
// Depends on: User Mgr (for parm checking)
//
// Globals:
// For User Mgr:
// SoundBlasterPresent - SoundBlaster card present?
// AdLibPresent - AdLib card present?
// SoundMode - What device is used for sound effects
// (Use SM_SetSoundMode() to set)
// MusicMode - What device is used for music
// (Use SM_SetMusicMode() to set)
// DigiMode - What device is used for digitized sound effects
// (Use SM_SetDigiDevice() to set)
//
// For Cache Mgr:
// NeedsDigitized - load digitized sounds?
// NeedsMusic - load music?
//
#include "wl_def.h"
#include <SDL_mixer.h>
#if defined(GP2X_940)
#include "gp2x/fmopl.h"
#else
#include "fmopl.h"
#endif
#pragma hdrstop
#define ORIGSAMPLERATE 7042
typedef struct
{
char RIFF[4];
longword filelenminus8;
char WAVE[4];
char fmt_[4];
longword formatlen;
word val0x0001;
word channels;
longword samplerate;
longword bytespersec;
word bytespersample;
word bitspersample;
} headchunk;
typedef struct
{
char chunkid[4];
longword chunklength;
} wavechunk;
typedef struct
{
uint32_t startpage;
uint32_t length;
} digiinfo;
static Mix_Chunk *SoundChunks[ STARTMUSIC - STARTDIGISOUNDS];
static byte *SoundBuffers[STARTMUSIC - STARTDIGISOUNDS];
globalsoundpos channelSoundPos[MIX_CHANNELS];
// Global variables
boolean AdLibPresent,
SoundBlasterPresent,SBProPresent,
SoundPositioned;
SDMode SoundMode;
SMMode MusicMode;
SDSMode DigiMode;
static byte **SoundTable;
int DigiMap[LASTSOUND];
int DigiChannel[STARTMUSIC - STARTDIGISOUNDS];
// Internal variables
static boolean SD_Started;
static boolean nextsoundpos;
static soundnames SoundNumber;
static soundnames DigiNumber;
static word SoundPriority;
static word DigiPriority;
static int LeftPosition;
static int RightPosition;
word NumDigi;
static digiinfo *DigiList;
static boolean DigiPlaying;
// PC Sound variables
static volatile byte pcLastSample;
static byte * volatile pcSound;
static longword pcLengthLeft;
// AdLib variables
static byte * volatile alSound;
static byte alBlock;
static longword alLengthLeft;
static longword alTimeCount;
static Instrument alZeroInst;
// Sequencer variables
static volatile boolean sqActive;
static word *sqHack;
static word *sqHackPtr;
static int sqHackLen;
static int sqHackSeqLen;
static longword sqHackTime;
static void SDL_SoundFinished(void)
{
SoundNumber = (soundnames)0;
SoundPriority = 0;
}
#ifdef NOTYET
void SDL_turnOnPCSpeaker(word timerval);
#pragma aux SDL_turnOnPCSpeaker = \
"mov al,0b6h" \
"out 43h,al" \
"mov al,bl" \
"out 42h,al" \
"mov al,bh" \
"out 42h,al" \
"in al,61h" \
"or al,3" \
"out 61h,al" \
parm [bx] \
modify exact [al]
void SDL_turnOffPCSpeaker();
#pragma aux SDL_turnOffPCSpeaker = \
"in al,61h" \
"and al,0fch" \
"out 61h,al" \
modify exact [al]
void SDL_setPCSpeaker(byte val);
#pragma aux SDL_setPCSpeaker = \
"in al,61h" \
"and al,0fch" \
"or al,ah" \
"out 61h,al" \
parm [ah] \
modify exact [al]
void inline SDL_DoFX()
{
if(pcSound)
{
if(*pcSound!=pcLastSample)
{
pcLastSample=*pcSound;
if(pcLastSample)
SDL_turnOnPCSpeaker(pcLastSample*60);
else
SDL_turnOffPCSpeaker();
}
pcSound++;
pcLengthLeft--;
if(!pcLengthLeft)
{
pcSound=0;
SoundNumber=(soundnames)0;
SoundPriority=0;
SDL_turnOffPCSpeaker();
}
}
// [adlib sound stuff removed...]
}
static void SDL_DigitizedDoneInIRQ(void);
void inline SDL_DoFast()
{
count_fx++;
if(count_fx>=5)
{
count_fx=0;
SDL_DoFX();
count_time++;
if(count_time>=2)
{
TimeCount++;
count_time=0;
}
}
// [adlib music and soundsource stuff removed...]
TimerCount+=TimerDivisor;
if(*((word *)&TimerCount+1))
{
*((word *)&TimerCount+1)=0;
t0OldService();
}
else
{
outp(0x20,0x20);
}
}
// Timer 0 ISR for 7000Hz interrupts
void __interrupt SDL_t0ExtremeAsmService(void)
{
if(pcindicate)
{
if(pcSound)
{
SDL_setPCSpeaker(((*pcSound++)&0x80)>>6);
pcLengthLeft--;
if(!pcLengthLeft)
{
pcSound=0;
SDL_turnOffPCSpeaker();
SDL_DigitizedDoneInIRQ();
}
}
}
extreme++;
if(extreme>=10)
{
extreme=0;
SDL_DoFast();
}
else
outp(0x20,0x20);
}
// Timer 0 ISR for 700Hz interrupts
void __interrupt SDL_t0FastAsmService(void)
{
SDL_DoFast();
}
// Timer 0 ISR for 140Hz interrupts
void __interrupt SDL_t0SlowAsmService(void)
{
count_time++;
if(count_time>=2)
{
TimeCount++;
count_time=0;
}
SDL_DoFX();
TimerCount+=TimerDivisor;
if(*((word *)&TimerCount+1))
{
*((word *)&TimerCount+1)=0;
t0OldService();
}
else
outp(0x20,0x20);
}
void SDL_IndicatePC(boolean ind)
{
pcindicate=ind;
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_SetTimer0() - Sets system timer 0 to the specified speed
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_SetTimer0(word speed)
{
#ifndef TPROF // If using Borland's profiling, don't screw with the timer
// _asm pushfd
_asm cli
outp(0x43,0x36); // Change timer 0
outp(0x40,(byte)speed);
outp(0x40,speed >> 8);
// Kludge to handle special case for digitized PC sounds
if (TimerDivisor == (1192030 / (TickBase * 100)))
TimerDivisor = (1192030 / (TickBase * 10));
else
TimerDivisor = speed;
// _asm popfd
_asm sti
#else
TimerDivisor = 0x10000;
#endif
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_SetIntsPerSec() - Uses SDL_SetTimer0() to set the number of
// interrupts generated by system timer 0 per second
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_SetIntsPerSec(word ints)
{
TimerRate = ints;
SDL_SetTimer0(1192030 / ints);
}
static void
SDL_SetTimerSpeed(void)
{
word rate;
void (_interrupt *isr)(void);
if ((DigiMode == sds_PC) && DigiPlaying)
{
rate = TickBase * 100;
isr = SDL_t0ExtremeAsmService;
}
else if ((MusicMode == smm_AdLib) || ((DigiMode == sds_SoundSource) && DigiPlaying) )
{
rate = TickBase * 10;
isr = SDL_t0FastAsmService;
}
else
{
rate = TickBase * 2;
isr = SDL_t0SlowAsmService;
}
if (rate != TimerRate)
{
_dos_setvect(8,isr);
SDL_SetIntsPerSec(rate);
TimerRate = rate;
}
}
//
// PC Sound code
//
///////////////////////////////////////////////////////////////////////////
//
// SDL_PCPlaySample() - Plays the specified sample on the PC speaker
//
///////////////////////////////////////////////////////////////////////////
#ifdef _MUSE_
void
#else
static void
#endif
SDL_PCPlaySample(byte *data,longword len,boolean inIRQ)
{
if(!inIRQ)
{
// _asm pushfd
_asm cli
}
SDL_IndicatePC(true);
pcLengthLeft = len;
pcSound = (volatile byte *)data;
if(!inIRQ)
{
// _asm popfd
_asm sti
}
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_PCStopSample() - Stops a sample playing on the PC speaker
//
///////////////////////////////////////////////////////////////////////////
#ifdef _MUSE_
void
#else
static void
#endif
SDL_PCStopSampleInIRQ(void)
{
pcSound = 0;
SDL_IndicatePC(false);
_asm in al,0x61 // Turn the speaker off
_asm and al,0xfd // ~2
_asm out 0x61,al
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_PCPlaySound() - Plays the specified sound on the PC speaker
//
///////////////////////////////////////////////////////////////////////////
#ifdef _MUSE_
void
#else
static void
#endif
SDL_PCPlaySound(PCSound *sound)
{
// _asm pushfd
_asm cli
pcLastSample = -1;
pcLengthLeft = sound->common.length;
pcSound = sound->data;
// _asm popfd
_asm sti
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_PCStopSound() - Stops the current sound playing on the PC Speaker
//
///////////////////////////////////////////////////////////////////////////
#ifdef _MUSE_
void
#else
static void
#endif
SDL_PCStopSound(void)
{
// _asm pushfd
_asm cli
pcSound = 0;
_asm in al,0x61 // Turn the speaker off
_asm and al,0xfd // ~2
_asm out 0x61,al
// _asm popfd
_asm sti
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_ShutPC() - Turns off the pc speaker
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_ShutPC(void)
{
// _asm pushfd
_asm cli
pcSound = 0;
_asm in al,0x61 // Turn the speaker & gate off
_asm and al,0xfc // ~3
_asm out 0x61,al
// _asm popfd
_asm sti
}
#endif
void
SD_StopDigitized(void)
{
DigiPlaying = false;
DigiNumber = (soundnames) 0;
DigiPriority = 0;
SoundPositioned = false;
if ((DigiMode == sds_PC) && (SoundMode == sdm_PC))
SDL_SoundFinished();
switch (DigiMode)
{
case sds_PC:
// SDL_PCStopSampleInIRQ();
break;
case sds_SoundBlaster:
// SDL_SBStopSampleInIRQ();
Mix_HaltChannel(-1);
break;
}
}
int SD_GetChannelForDigi(int which)
{
if(DigiChannel[which] != -1) return DigiChannel[which];
int channel = Mix_GroupAvailable(1);
if(channel == -1) channel = Mix_GroupOldest(1);
if(channel == -1) // All sounds stopped in the meantime?
return Mix_GroupAvailable(1);
return channel;
}
void SD_SetPosition(int channel, int leftpos, int rightpos)
{
if((leftpos < 0) || (leftpos > 15) || (rightpos < 0) || (rightpos > 15)
|| ((leftpos == 15) && (rightpos == 15)))
Quit("SD_SetPosition: Illegal position");
switch (DigiMode)
{
case sds_SoundBlaster:
// SDL_PositionSBP(leftpos,rightpos);
Mix_SetPanning(channel, ((15 - leftpos) << 4) + 15,
((15 - rightpos) << 4) + 15);
break;
}
}
Sint16 GetSample(float csample, byte *samples, int size)
{
float s0=0, s1=0, s2=0;
int cursample = (int) csample;
float sf = csample - (float) cursample;
if(cursample-1 >= 0) s0 = (float) (samples[cursample-1] - 128);
s1 = (float) (samples[cursample] - 128);
if(cursample+1 < size) s2 = (float) (samples[cursample+1] - 128);
float val = s0*sf*(sf-1)/2 - s1*(sf*sf-1) + s2*(sf+1)*sf/2;
int32_t intval = (int32_t) (val * 256);
if(intval < -32768) intval = -32768;
else if(intval > 32767) intval = 32767;
return (Sint16) intval;
}
void SD_PrepareSound(int which)
{
if(DigiList == NULL)
Quit("SD_PrepareSound(%i): DigiList not initialized!\n", which);
int page = DigiList[which].startpage;
int size = DigiList[which].length;
byte *origsamples = PM_GetSound(page);
if(origsamples + size >= PM_GetEnd())
Quit("SD_PrepareSound(%i): Sound reaches out of page file!\n", which);
int destsamples = (int) ((float) size * (float) param_samplerate
/ (float) ORIGSAMPLERATE);
byte *wavebuffer = (byte *) malloc(sizeof(headchunk) + sizeof(wavechunk)
+ destsamples * 2); // dest are 16-bit samples
if(wavebuffer == NULL)
Quit("Unable to allocate wave buffer for sound %i!\n", which);
headchunk head = {{'R','I','F','F'}, 0, {'W','A','V','E'},
{'f','m','t',' '}, 0x10, 0x0001, 1, param_samplerate, param_samplerate*2, 2, 16};
wavechunk dhead = {{'d', 'a', 't', 'a'}, destsamples*2};
head.filelenminus8 = sizeof(head) + destsamples*2; // (sizeof(dhead)-8 = 0)
memcpy(wavebuffer, &head, sizeof(head));
memcpy(wavebuffer+sizeof(head), &dhead, sizeof(dhead));
// alignment is correct, as wavebuffer comes from malloc
// and sizeof(headchunk) % 4 == 0 and sizeof(wavechunk) % 4 == 0
Sint16 *newsamples = (Sint16 *)(void *) (wavebuffer + sizeof(headchunk)
+ sizeof(wavechunk));
float cursample = 0.F;
float samplestep = (float) ORIGSAMPLERATE / (float) param_samplerate;
for(int i=0; i<destsamples; i++, cursample+=samplestep)
{
newsamples[i] = GetSample((float)size * (float)i / (float)destsamples,
origsamples, size);
}
SoundBuffers[which] = wavebuffer;
SoundChunks[which] = Mix_LoadWAV_RW(SDL_RWFromMem(wavebuffer,
sizeof(headchunk) + sizeof(wavechunk) + destsamples * 2), 1);
}
int SD_PlayDigitized(word which,int leftpos,int rightpos)
{
if (!DigiMode)
return 0;
if (which >= NumDigi)
Quit("SD_PlayDigitized: bad sound number %i", which);
int channel = SD_GetChannelForDigi(which);
SD_SetPosition(channel, leftpos,rightpos);
DigiPlaying = true;
Mix_Chunk *sample = SoundChunks[which];
if(sample == NULL)
{
printf("SoundChunks[%i] is NULL!\n", which);
return 0;
}
if(Mix_PlayChannel(channel, sample, 0) == -1)
{
printf("Unable to play sound: %s\n", Mix_GetError());
return 0;
}
return channel;
}
void SD_ChannelFinished(int channel)
{
channelSoundPos[channel].valid = 0;
}
void
SD_SetDigiDevice(SDSMode mode)
{
boolean devicenotpresent;
if (mode == DigiMode)
return;
SD_StopDigitized();
devicenotpresent = false;
switch (mode)
{
case sds_SoundBlaster:
if (!SoundBlasterPresent)
devicenotpresent = true;
break;
}
if (!devicenotpresent)
{
DigiMode = mode;
#ifdef NOTYET
SDL_SetTimerSpeed();
#endif
}
}
void
SDL_SetupDigi(void)
{
// Correct padding enforced by PM_Startup()
word *soundInfoPage = (word *) (void *) PM_GetPage(ChunksInFile-1);
NumDigi = (word) PM_GetPageSize(ChunksInFile - 1) / 4;
DigiList = (digiinfo *) malloc(NumDigi * sizeof(digiinfo));
int i;
for(i = 0; i < NumDigi; i++)
{
// Calculate the size of the digi from the sizes of the pages between
// the start page and the start page of the next sound
DigiList[i].startpage = soundInfoPage[i * 2];
if((int) DigiList[i].startpage >= ChunksInFile - 1)
{
NumDigi = i;
break;
}
int lastPage;
if(i < NumDigi - 1)
{
lastPage = soundInfoPage[i * 2 + 2];
if(lastPage == 0 || lastPage + PMSoundStart > ChunksInFile - 1) lastPage = ChunksInFile - 1;
else lastPage += PMSoundStart;
}
else lastPage = ChunksInFile - 1;
int size = 0;
for(int page = PMSoundStart + DigiList[i].startpage; page < lastPage; page++)
size += PM_GetPageSize(page);
// Don't include padding of sound info page, if padding was added
if(lastPage == ChunksInFile - 1 && PMSoundInfoPagePadded) size--;
// Patch lower 16-bit of size with size from sound info page.
// The original VSWAP contains padding which is included in the page size,
// but not included in the 16-bit size. So we use the more precise value.
if((size & 0xffff0000) != 0 && (size & 0xffff) < soundInfoPage[i * 2 + 1])
size -= 0x10000;
size = (size & 0xffff0000) | soundInfoPage[i * 2 + 1];
DigiList[i].length = size;
}
for(i = 0; i < LASTSOUND; i++)
{
DigiMap[i] = -1;
DigiChannel[i] = -1;
}
}
// AdLib Code
///////////////////////////////////////////////////////////////////////////
//
// SDL_ALStopSound() - Turns off any sound effects playing through the
// AdLib card
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_ALStopSound(void)
{
alSound = 0;
alOut(alFreqH + 0, 0);
}
static void
SDL_AlSetFXInst(Instrument *inst)
{
byte c,m;
m = 0; // modulator cell for channel 0
c = 3; // carrier cell for channel 0
alOut(m + alChar,inst->mChar);
alOut(m + alScale,inst->mScale);
alOut(m + alAttack,inst->mAttack);
alOut(m + alSus,inst->mSus);
alOut(m + alWave,inst->mWave);
alOut(c + alChar,inst->cChar);
alOut(c + alScale,inst->cScale);
alOut(c + alAttack,inst->cAttack);
alOut(c + alSus,inst->cSus);
alOut(c + alWave,inst->cWave);
// Note: Switch commenting on these lines for old MUSE compatibility
// alOutInIRQ(alFeedCon,inst->nConn);
alOut(alFeedCon,0);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_ALPlaySound() - Plays the specified sound on the AdLib card
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_ALPlaySound(AdLibSound *sound)
{
Instrument *inst;
byte *data;
SDL_ALStopSound();
alLengthLeft = sound->common.length;
data = sound->data;
alBlock = ((sound->block & 7) << 2) | 0x20;
inst = &sound->inst;
if (!(inst->mSus | inst->cSus))
{
Quit("SDL_ALPlaySound() - Bad instrument");
}
SDL_AlSetFXInst(inst);
alSound = (byte *)data;
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_ShutAL() - Shuts down the AdLib card for sound effects
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_ShutAL(void)
{
alSound = 0;
alOut(alEffects,0);
alOut(alFreqH + 0,0);
SDL_AlSetFXInst(&alZeroInst);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_CleanAL() - Totally shuts down the AdLib card
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_CleanAL(void)
{
int i;
alOut(alEffects,0);
for (i = 1; i < 0xf5; i++)
alOut(i, 0);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_StartAL() - Starts up the AdLib card for sound effects
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_StartAL(void)
{
alOut(alEffects, 0);
SDL_AlSetFXInst(&alZeroInst);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_DetectAdLib() - Determines if there's an AdLib (or SoundBlaster
// emulating an AdLib) present
//
///////////////////////////////////////////////////////////////////////////
static boolean
SDL_DetectAdLib(void)
{
for (int i = 1; i <= 0xf5; i++) // Zero all the registers
alOut(i, 0);
alOut(1, 0x20); // Set WSE=1
// alOut(8, 0); // Set CSM=0 & SEL=0
return true;
}
////////////////////////////////////////////////////////////////////////////
//
// SDL_ShutDevice() - turns off whatever device was being used for sound fx
//
////////////////////////////////////////////////////////////////////////////
static void
SDL_ShutDevice(void)
{
switch (SoundMode)
{
case sdm_PC:
// SDL_ShutPC();
break;
case sdm_AdLib:
SDL_ShutAL();
break;
}
SoundMode = sdm_Off;
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_CleanDevice() - totally shuts down all sound devices
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_CleanDevice(void)
{
if ((SoundMode == sdm_AdLib) || (MusicMode == smm_AdLib))
SDL_CleanAL();
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_StartDevice() - turns on whatever device is to be used for sound fx
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_StartDevice(void)
{
switch (SoundMode)
{
case sdm_AdLib:
SDL_StartAL();
break;
}
SoundNumber = (soundnames) 0;
SoundPriority = 0;
}
// Public routines
///////////////////////////////////////////////////////////////////////////
//
// SD_SetSoundMode() - Sets which sound hardware to use for sound effects
//
///////////////////////////////////////////////////////////////////////////
boolean
SD_SetSoundMode(SDMode mode)
{
boolean result = false;
word tableoffset;
SD_StopSound();
if ((mode == sdm_AdLib) && !AdLibPresent)
mode = sdm_PC;
switch (mode)
{
case sdm_Off:
tableoffset = STARTADLIBSOUNDS;
result = true;
break;
case sdm_PC:
tableoffset = STARTPCSOUNDS;
result = true;
break;
case sdm_AdLib:
tableoffset = STARTADLIBSOUNDS;
if (AdLibPresent)
result = true;
break;
default:
Quit("SD_SetSoundMode: Invalid sound mode %i", mode);
return false;
}
SoundTable = &audiosegs[tableoffset];
if (result && (mode != SoundMode))
{
SDL_ShutDevice();
SoundMode = mode;
SDL_StartDevice();
}
return(result);
}
///////////////////////////////////////////////////////////////////////////
//
// SD_SetMusicMode() - sets the device to use for background music
//
///////////////////////////////////////////////////////////////////////////
boolean
SD_SetMusicMode(SMMode mode)
{
boolean result = false;
SD_FadeOutMusic();
while (SD_MusicPlaying())
SDL_Delay(5);
switch (mode)
{
case smm_Off:
result = true;
break;
case smm_AdLib:
if (AdLibPresent)
result = true;
break;
}
if (result)
MusicMode = mode;
// SDL_SetTimerSpeed();
return(result);
}
int numreadysamples = 0;
byte *curAlSound = 0;
byte *curAlSoundPtr = 0;
longword curAlLengthLeft = 0;
int soundTimeCounter = 5;
int samplesPerMusicTick;
void SDL_IMFMusicPlayer(void *udata, Uint8 *stream, int len)
{
int stereolen = len>>1;
int sampleslen = stereolen>>1;
INT16 *stream16 = (INT16 *) (void *) stream; // expect correct alignment
while(1)
{
if(numreadysamples)
{
if(numreadysamples<sampleslen)
{
YM3812UpdateOne(0, stream16, numreadysamples);
stream16 += numreadysamples*2;
sampleslen -= numreadysamples;
}
else
{
YM3812UpdateOne(0, stream16, sampleslen);
numreadysamples -= sampleslen;
return;
}
}
soundTimeCounter--;
if(!soundTimeCounter)
{
soundTimeCounter = 5;
if(curAlSound != alSound)
{
curAlSound = curAlSoundPtr = alSound;
curAlLengthLeft = alLengthLeft;
}
if(curAlSound)
{
if(*curAlSoundPtr)