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libretro-wolfenstein3d/id_sd.cpp
fabien sanglard f109352ff6 Removed all GP2X code.
2014-07-13 10:12:27 -07:00

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//
// 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/SDL_mixer.h>
#include "fmopl.h"
#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 byte * volatile pcSound;
// 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)
{
alOut(alFreqL, *curAlSoundPtr);
alOut(alFreqH, alBlock);
}
else alOut(alFreqH, 0);
curAlSoundPtr++;
curAlLengthLeft--;
if(!curAlLengthLeft)
{
curAlSound = alSound = 0;
SoundNumber = (soundnames) 0;
SoundPriority = 0;
alOut(alFreqH, 0);
}
}
}
if(sqActive)
{
do
{
if(sqHackTime > alTimeCount) break;
sqHackTime = alTimeCount + *(sqHackPtr+1);
alOut(*(byte *) sqHackPtr, *(((byte *) sqHackPtr)+1));
sqHackPtr += 2;
sqHackLen -= 4;
}
while(sqHackLen>0);
alTimeCount++;
if(!sqHackLen)
{
sqHackPtr = sqHack;
sqHackLen = sqHackSeqLen;
sqHackTime = 0;
alTimeCount = 0;
}
}
numreadysamples = samplesPerMusicTick;
}
}
///////////////////////////////////////////////////////////////////////////
//
// SD_Startup() - starts up the Sound Mgr
// Detects all additional sound hardware and installs my ISR
//
///////////////////////////////////////////////////////////////////////////
void
SD_Startup(void)
{
int i;
if (SD_Started)
return;
if(Mix_OpenAudio(param_samplerate, AUDIO_S16, 2, param_audiobuffer))
{
printf("Unable to open audio: %s\n", Mix_GetError());
return;
}
Mix_ReserveChannels(2); // reserve player and boss weapon channels
Mix_GroupChannels(2, MIX_CHANNELS-1, 1); // group remaining channels
// Init music
samplesPerMusicTick = param_samplerate / 700; // SDL_t0FastAsmService played at 700Hz
if(YM3812Init(1,3579545,param_samplerate))
{
printf("Unable to create virtual OPL!!\n");
}
for(i=1;i<0xf6;i++)
YM3812Write(0,i,0);
YM3812Write(0,1,0x20); // Set WSE=1
// YM3812Write(0,8,0); // Set CSM=0 & SEL=0 // already set in for statement
Mix_HookMusic(SDL_IMFMusicPlayer, 0);
Mix_ChannelFinished(SD_ChannelFinished);
AdLibPresent = true;
SoundBlasterPresent = true;
alTimeCount = 0;
SD_SetSoundMode(sdm_Off);
SD_SetMusicMode(smm_Off);
SDL_SetupDigi();
SD_Started = true;
}
///////////////////////////////////////////////////////////////////////////
//
// SD_Shutdown() - shuts down the Sound Mgr
// Removes sound ISR and turns off whatever sound hardware was active
//
///////////////////////////////////////////////////////////////////////////
void
SD_Shutdown(void)
{
if (!SD_Started)
return;
SD_MusicOff();
SD_StopSound();
for(int i = 0; i < STARTMUSIC - STARTDIGISOUNDS; i++)
{
if(SoundChunks[i]) Mix_FreeChunk(SoundChunks[i]);
if(SoundBuffers[i]) free(SoundBuffers[i]);
}
free(DigiList);
SD_Started = false;
}
///////////////////////////////////////////////////////////////////////////
//
// SD_PositionSound() - Sets up a stereo imaging location for the next
// sound to be played. Each channel ranges from 0 to 15.
//
///////////////////////////////////////////////////////////////////////////
void
SD_PositionSound(int leftvol,int rightvol)
{
LeftPosition = leftvol;
RightPosition = rightvol;
nextsoundpos = true;
}
///////////////////////////////////////////////////////////////////////////
//
// SD_PlaySound() - plays the specified sound on the appropriate hardware
//
///////////////////////////////////////////////////////////////////////////
boolean
SD_PlaySound(soundnames sound)
{
boolean ispos;
SoundCommon *s;
int lp,rp;
lp = LeftPosition;
rp = RightPosition;
LeftPosition = 0;
RightPosition = 0;
ispos = nextsoundpos;
nextsoundpos = false;
if (sound == -1 || (DigiMode == sds_Off && SoundMode == sdm_Off))
return 0;
s = (SoundCommon *) SoundTable[sound];
if ((SoundMode != sdm_Off) && !s)
Quit("SD_PlaySound() - Uncached sound");
if ((DigiMode != sds_Off) && (DigiMap[sound] != -1))
{
if ((DigiMode == sds_PC) && (SoundMode == sdm_PC))
{
#ifdef NOTYET
if (s->priority < SoundPriority)
return 0;
SDL_PCStopSound();
SD_PlayDigitized(DigiMap[sound],lp,rp);
SoundPositioned = ispos;
SoundNumber = sound;
SoundPriority = s->priority;
#else
return 0;
#endif
}
else
{
#ifdef NOTYET
if (s->priority < DigiPriority)
return(false);
#endif
int channel = SD_PlayDigitized(DigiMap[sound], lp, rp);
SoundPositioned = ispos;
DigiNumber = sound;
DigiPriority = s->priority;
return channel + 1;
}
return(true);
}
if (SoundMode == sdm_Off)
return 0;
if (!s->length)
Quit("SD_PlaySound() - Zero length sound");
if (s->priority < SoundPriority)
return 0;
switch (SoundMode)
{
case sdm_PC:
// SDL_PCPlaySound((PCSound *)s);
break;
case sdm_AdLib:
SDL_ALPlaySound((AdLibSound *)s);
break;
}
SoundNumber = sound;
SoundPriority = s->priority;
return 0;
}
///////////////////////////////////////////////////////////////////////////
//
// SD_SoundPlaying() - returns the sound number that's playing, or 0 if
// no sound is playing
//
///////////////////////////////////////////////////////////////////////////
word
SD_SoundPlaying(void)
{
boolean result = false;
switch (SoundMode)
{
case sdm_PC:
result = pcSound? true : false;
break;
case sdm_AdLib:
result = alSound? true : false;
break;
}
if (result)
return(SoundNumber);
else
return(false);
}
///////////////////////////////////////////////////////////////////////////
//
// SD_StopSound() - if a sound is playing, stops it
//
///////////////////////////////////////////////////////////////////////////
void
SD_StopSound(void)
{
if (DigiPlaying)
SD_StopDigitized();
switch (SoundMode)
{
case sdm_PC:
// SDL_PCStopSound();
break;
case sdm_AdLib:
SDL_ALStopSound();
break;
}
SoundPositioned = false;
SDL_SoundFinished();
}
///////////////////////////////////////////////////////////////////////////
//
// SD_WaitSoundDone() - waits until the current sound is done playing
//
///////////////////////////////////////////////////////////////////////////
void
SD_WaitSoundDone(void)
{
while (SD_SoundPlaying())
SDL_Delay(5);
}
///////////////////////////////////////////////////////////////////////////
//
// SD_MusicOn() - turns on the sequencer
//
///////////////////////////////////////////////////////////////////////////
void
SD_MusicOn(void)
{
sqActive = true;
}
///////////////////////////////////////////////////////////////////////////
//
// SD_MusicOff() - turns off the sequencer and any playing notes
// returns the last music offset for music continue
//
///////////////////////////////////////////////////////////////////////////
int
SD_MusicOff(void)
{
word i;
sqActive = false;
switch (MusicMode)
{
case smm_AdLib:
alOut(alEffects, 0);
for (i = 0;i < sqMaxTracks;i++)
alOut(alFreqH + i + 1, 0);
break;
}
return (int) (sqHackPtr-sqHack);
}
///////////////////////////////////////////////////////////////////////////
//
// SD_StartMusic() - starts playing the music pointed to
//
///////////////////////////////////////////////////////////////////////////
void
SD_StartMusic(int chunk)
{
SD_MusicOff();
if (MusicMode == smm_AdLib)
{
int32_t chunkLen = CA_CacheAudioChunk(chunk);
sqHack = (word *)(void *) audiosegs[chunk]; // alignment is correct
if(*sqHack == 0) sqHackLen = sqHackSeqLen = chunkLen;
else sqHackLen = sqHackSeqLen = *sqHack++;
sqHackPtr = sqHack;
sqHackTime = 0;
alTimeCount = 0;
SD_MusicOn();
}
}
void
SD_ContinueMusic(int chunk, int startoffs)
{
SD_MusicOff();
if (MusicMode == smm_AdLib)
{
int32_t chunkLen = CA_CacheAudioChunk(chunk);
sqHack = (word *)(void *) audiosegs[chunk]; // alignment is correct
if(*sqHack == 0) sqHackLen = sqHackSeqLen = chunkLen;
else sqHackLen = sqHackSeqLen = *sqHack++;
sqHackPtr = sqHack;
if(startoffs >= sqHackLen)
{
Quit("SD_StartMusic: Illegal startoffs provided!");
}
// fast forward to correct position
// (needed to reconstruct the instruments)
for(int i = 0; i < startoffs; i += 2)
{
byte reg = *(byte *)sqHackPtr;
byte val = *(((byte *)sqHackPtr) + 1);
if(reg >= 0xb1 && reg <= 0xb8) val &= 0xdf; // disable play note flag
else if(reg == 0xbd) val &= 0xe0; // disable drum flags
alOut(reg,val);
sqHackPtr += 2;
sqHackLen -= 4;
}
sqHackTime = 0;
alTimeCount = 0;
SD_MusicOn();
}
}
///////////////////////////////////////////////////////////////////////////
//
// SD_FadeOutMusic() - starts fading out the music. Call SD_MusicPlaying()
// to see if the fadeout is complete
//
///////////////////////////////////////////////////////////////////////////
void
SD_FadeOutMusic(void)
{
switch (MusicMode)
{
case smm_AdLib:
// DEBUG - quick hack to turn the music off
SD_MusicOff();
break;
}
}
///////////////////////////////////////////////////////////////////////////
//
// SD_MusicPlaying() - returns true if music is currently playing, false if
// not
//
///////////////////////////////////////////////////////////////////////////
boolean
SD_MusicPlaying(void)
{
boolean result;
switch (MusicMode)
{
case smm_AdLib:
result = sqActive;
break;
default:
result = false;
break;
}
return(result);
}
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