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ID_SD.C
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ID_SD.C
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/* Catacomb Apocalypse Source Code
* Copyright (C) 1993-2014 Flat Rock Software
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
//
// ID Engine
// ID_SD.c - Sound Manager
// v1.1d1
// 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:
// SoundSourcePresent - Sound Source thingie present?
// 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)
// For Cache Mgr:
// NeedsDigitized - load digitized sounds?
// NeedsMusic - load music?
//
#define USE_MUSIC 0
#pragma hdrstop // Wierdo thing with MUSE
#include <dos.h>
#ifdef _MUSE_ // Will be defined in ID_Types.h
#include "ID_SD.h"
#else
#include "ID_HEADS.H"
#endif
#pragma hdrstop
#pragma warn -pia
#define SDL_SoundFinished() {SoundNumber = SoundPriority = 0;}
// Macros for AdLib stuff
#define selreg(n) outportb(0x388,n)
#define writereg(n) outportb(0x389,n)
#define readstat() inportb(0x388)
// Global variables
boolean SoundSourcePresent,SoundBlasterPresent,AdLibPresent,
NeedsDigitized,NeedsMusic;
SDMode SoundMode;
SMMode MusicMode;
longword TimeCount;
word HackCount;
word *SoundTable; // Really * _seg *SoundTable, but that don't work
boolean ssIsTandy;
word ssPort = 2;
// Internal variables
static boolean SD_Started;
static boolean TimerDone;
static word TimerVal,TimerDelay10,TimerDelay25,TimerDelay100;
static longword TimerDivisor,TimerCount;
static char *ParmStrings[] =
{
"noal",
nil
};
static void (*SoundUserHook)(void);
static word SoundNumber,SoundPriority;
static void interrupt (*t0OldService)(void);
//static word t0CountTable[] = {8,8,8,8,40,40};
static long LocalTime;
// PC Sound variables
static byte pcLastSample,far *pcSound;
static longword pcLengthLeft;
static word pcSoundLookup[255];
// AdLib variables
static boolean alNoCheck;
static byte far *alSound;
static word alBlock;
static longword alLengthLeft;
static longword alTimeCount;
static Instrument alZeroInst;
// This table maps channel numbers to carrier and modulator op cells
static byte carriers[9] = { 3, 4, 5,11,12,13,19,20,21},
modifiers[9] = { 0, 1, 2, 8, 9,10,16,17,18},
// This table maps percussive voice numbers to op cells
pcarriers[5] = {19,0xff,0xff,0xff,0xff},
pmodifiers[5] = {16,17,18,20,21};
// Sequencer variables
static boolean sqActive;
static word alFXReg;
static ActiveTrack *tracks[sqMaxTracks],
mytracks[sqMaxTracks];
static word sqMode,sqFadeStep;
static word far *sqHack,far *sqHackPtr,sqHackLen,sqHackSeqLen;
static long sqHackTime;
// Internal routines
///////////////////////////////////////////////////////////////////////////
//
// SDL_SetTimer0() - Sets system timer 0 to the specified speed
//
///////////////////////////////////////////////////////////////////////////
#pragma argsused
static void
SDL_SetTimer0(word speed)
{
#ifndef TPROF // If using Borland's profiling, don't screw with the timer
outportb(0x43,0x36); // Change timer 0
outportb(0x40,speed);
outportb(0x40,speed >> 8);
TimerDivisor = speed;
#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)
{
SDL_SetTimer0(1192030 / ints);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_TimingService() - Used by SDL_InitDelay() to determine a timing
// value for the current system that we're running on
//
///////////////////////////////////////////////////////////////////////////
static void interrupt
SDL_TimingService(void)
{
TimerVal = _CX;
TimerDone++;
outportb(0x20,0x20); // Ack interrupt
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_InitDelay() - Sets up TimerDelay's for SDL_Delay()
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_InitDelay(void)
{
int i;
word timer;
setvect(8,SDL_TimingService); // Set to my timer 0 ISR
SDL_SetIntsPerSec(1000); // Time 1ms
for (i = 0,timer = 0;i < 10;i++) // Do timing test 10 times
{
asm xor dx,dx // Zero DX
asm mov cx,0xffff // Put starting value in CX
asm mov [TimerDone],cx // TimerDone = false - 1
startloop:
asm or [TimerDone],0
asm jnz startloop // Make sure we're at the start
loop:
asm test [TimerDone],1 // See if TimerDone flag got hit
asm jnz done // Yep - drop out of the loop
asm loop loop
done:
if (0xffff - TimerVal > timer)
timer = 0xffff - TimerVal;
}
timer += timer / 2; // Use some slop
TimerDelay10 = timer / (1000 / 10);
TimerDelay25 = timer / (1000 / 25);
TimerDelay100 = timer / (1000 / 100);
SDL_SetTimer0(0); // Reset timer 0
setvect(8,t0OldService); // Set back to old ISR
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_Delay() - Delays the specified amount of time
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_Delay(word delay)
{
if (!delay)
return;
asm mov cx,[delay]
loop:
asm test [TimerDone],0 // Useless code - just for timing equivilency
asm jnz done
asm loop loop
done:;
}
//
// PC Sound code
//
///////////////////////////////////////////////////////////////////////////
//
// SDL_PCPlaySound() - Plays the specified sound on the PC speaker
//
///////////////////////////////////////////////////////////////////////////
#ifdef _MUSE_
void
#else
static void
#endif
SDL_PCPlaySound(PCSound far *sound)
{
asm pushf
asm cli
pcLastSample = -1;
pcLengthLeft = sound->common.length;
pcSound = sound->data;
asm popf
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_PCStopSound() - Stops the current sound playing on the PC Speaker
//
///////////////////////////////////////////////////////////////////////////
#ifdef _MUSE_
void
#else
static void
#endif
SDL_PCStopSound(void)
{
asm pushf
asm cli
(long)pcSound = 0;
asm in al,0x61 // Turn the speaker off
asm and al,0xfd // ~2
asm out 0x61,al
asm popf
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_PCService() - Handles playing the next sample in a PC sound
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_PCService(void)
{
byte s;
word t;
if (pcSound)
{
s = *pcSound++;
if (s != pcLastSample)
{
asm pushf
asm cli
pcLastSample = s;
if (s) // We have a frequency!
{
t = pcSoundLookup[s];
asm mov bx,[t]
asm mov al,0xb6 // Write to channel 2 (speaker) timer
asm out 43h,al
asm mov al,bl
asm out 42h,al // Low byte
asm mov al,bh
asm out 42h,al // High byte
asm in al,0x61 // Turn the speaker & gate on
asm or al,3
asm out 0x61,al
}
else // Time for some silence
{
asm in al,0x61 // Turn the speaker & gate off
asm and al,0xfc // ~3
asm out 0x61,al
}
asm popf
}
if (!(--pcLengthLeft))
{
SDL_PCStopSound();
SDL_SoundFinished();
}
}
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_ShutPC() - Turns off the pc speaker
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_ShutPC(void)
{
asm pushf
asm cli
pcSound = 0;
asm in al,0x61 // Turn the speaker & gate off
asm and al,0xfc // ~3
asm out 0x61,al
asm popf
}
// AdLib Code
///////////////////////////////////////////////////////////////////////////
//
// alOut(n,b) - Puts b in AdLib card register n
//
///////////////////////////////////////////////////////////////////////////
void
alOut(byte n,byte b)
{
asm pushf
asm cli
asm mov dx,0x388
asm mov al,[n]
asm out dx,al
#if 0
SDL_Delay(TimerDelay10);
#else
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
#endif
asm mov dx,0x389
asm mov al,[b]
asm out dx,al
asm popf
#if 0
SDL_Delay(TimerDelay25);
#else
asm mov dx,0x388
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
asm in al, dx
#endif
}
#if 0
///////////////////////////////////////////////////////////////////////////
//
// SDL_SetInstrument() - Puts an instrument into a generator
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_SetInstrument(int track,int which,Instrument far *inst,boolean percussive)
{
byte c,m;
if (percussive)
{
c = pcarriers[which];
m = pmodifiers[which];
}
else
{
c = carriers[which];
m = modifiers[which];
}
tracks[track - 1]->inst = *inst;
tracks[track - 1]->percussive = percussive;
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);
// Most percussive instruments only use one cell
if (c != 0xff)
{
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);
}
alOut(which + alFeedCon,inst->nConn); // DEBUG - I think this is right
}
#endif
///////////////////////////////////////////////////////////////////////////
//
// SDL_ALStopSound() - Turns off any sound effects playing through the
// AdLib card
//
///////////////////////////////////////////////////////////////////////////
#ifdef _MUSE_
void
#else
static void
#endif
SDL_ALStopSound(void)
{
asm pushf
asm cli
(long)alSound = 0;
alOut(alFreqH + 0,0);
asm popf
}
static void
SDL_AlSetFXInst(Instrument far *inst)
{
byte c,m;
m = modifiers[0];
c = carriers[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);
// DEBUG!!! - I just put this in
// alOut(alFeedCon,inst->nConn);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_ALPlaySound() - Plays the specified sound on the AdLib card
//
///////////////////////////////////////////////////////////////////////////
#ifdef _MUSE_
void
#else
static void
#endif
SDL_ALPlaySound(AdLibSound far *sound)
{
Instrument far *inst;
SDL_ALStopSound();
asm pushf
asm cli
alLengthLeft = sound->common.length;
alSound = sound->data;
alBlock = ((sound->block & 7) << 2) | 0x20;
inst = &sound->inst;
if (!(inst->mSus | inst->cSus))
{
asm popf
Quit("SDL_ALPlaySound() - Bad instrument");
}
SDL_AlSetFXInst(inst);
asm popf
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_ALSoundService() - Plays the next sample out through the AdLib card
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_ALSoundService(void)
{
byte s;
if (alSound)
{
s = *alSound++;
if (!s)
alOut(alFreqH + 0,0);
else
{
alOut(alFreqL + 0,s);
alOut(alFreqH + 0,alBlock);
}
if (!(--alLengthLeft))
{
(long)alSound = 0;
alOut(alFreqH + 0,0);
SDL_SoundFinished();
}
}
}
#if 0
///////////////////////////////////////////////////////////////////////////
//
// SDL_SelectMeasure() - sets up sequencing variables for a given track
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_SelectMeasure(ActiveTrack *track)
{
track->seq = track->moods[track->mood];
track->nextevent = 0;
}
#endif
static void
SDL_ALService(void)
{
byte a,v;
word w;
if (!sqActive)
return;
while (sqHackLen && (sqHackTime <= alTimeCount))
{
w = *sqHackPtr++;
sqHackTime = alTimeCount + *sqHackPtr++;
asm mov dx,[w]
asm mov [a],dl
asm mov [v],dh
alOut(a,v);
sqHackLen -= 4;
}
alTimeCount++;
if (!sqHackLen)
{
sqHackPtr = (word far *)sqHack;
sqHackLen = sqHackSeqLen;
alTimeCount = sqHackTime = 0;
}
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_ShutAL() - Shuts down the AdLib card for sound effects
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_ShutAL(void)
{
asm pushf
asm cli
alOut(alEffects,0);
alOut(alFreqH + 0,0);
SDL_AlSetFXInst(&alZeroInst);
alSound = 0;
asm popf
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_CleanAL() - Totally shuts down the AdLib card
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_CleanAL(void)
{
int i;
asm pushf
asm cli
alOut(alEffects,0);
for (i = 1;i < 0xf5;i++)
alOut(i,0);
asm popf
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_StartAL() - Starts up the AdLib card for sound effects
//
///////////////////////////////////////////////////////////////////////////
static void
SDL_StartAL(void)
{
alFXReg = 0;
alOut(alEffects,alFXReg);
SDL_AlSetFXInst(&alZeroInst);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_DetectAdLib() - Determines if there's an AdLib (or SoundBlaster
// emulating an AdLib) present
//
///////////////////////////////////////////////////////////////////////////
static boolean
SDL_DetectAdLib(void)
{
byte status1,status2;
int i;
alOut(4,0x60); // Reset T1 & T2
alOut(4,0x80); // Reset IRQ
status1 = readstat();
alOut(2,0xff); // Set timer 1
alOut(4,0x21); // Start timer 1
SDL_Delay(TimerDelay100);
status2 = readstat();
alOut(4,0x60);
alOut(4,0x80);
if (((status1 & 0xe0) == 0x00) && ((status2 & 0xe0) == 0xc0))
{
for (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);
}
else
return(false);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_t0Service() - My timer 0 ISR which handles the different timings and
// dispatches to whatever other routines are appropriate
//
///////////////////////////////////////////////////////////////////////////
static void interrupt
SDL_t0Service(void)
{
static word count = 1;
#if 0 // for debugging
asm mov dx,STATUS_REGISTER_1
asm in al,dx
asm mov dx,ATR_INDEX
asm mov al,ATR_OVERSCAN
asm out dx,al
asm mov al,4 // red
asm out dx,al
#endif
HackCount++;
#if USE_MUSIC
if (MusicMode == smm_AdLib)
{
SDL_ALService();
if (!(++count & 7))
{
LocalTime++;
TimeCount++;
if (SoundUserHook)
SoundUserHook();
}
if (!(count & 3))
{
switch (SoundMode)
{
case sdm_PC:
SDL_PCService();
break;
case sdm_AdLib:
SDL_ALSoundService();
break;
}
}
}
else
#endif
{
if (!(++count & 1))
{
LocalTime++;
TimeCount++;
if (SoundUserHook)
SoundUserHook();
}
switch (SoundMode)
{
case sdm_PC:
SDL_PCService();
break;
case sdm_AdLib:
SDL_ALSoundService();
break;
}
}
asm mov ax,[WORD PTR TimerCount]
asm add ax,[WORD PTR TimerDivisor]
asm mov [WORD PTR TimerCount],ax
asm jnc myack
t0OldService(); // If we overflow a word, time to call old int handler
asm jmp olddone
myack:;
outportb(0x20,0x20); // Ack the interrupt
olddone:;
#if 0 // for debugging
asm mov dx,STATUS_REGISTER_1
asm in al,dx
asm mov dx,ATR_INDEX
asm mov al,ATR_OVERSCAN
asm out dx,al
asm mov al,3 // blue
asm out dx,al
asm mov al,0x20 // normal
asm out dx,al
#endif
}
////////////////////////////////////////////////////////////////////////////
//
// 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 = SoundPriority = 0;
}
static void
SDL_SetTimerSpeed(void)
{
word rate;
#if USE_MUSIC
if (MusicMode == smm_AdLib)
rate = TickBase * 8;
else
#endif
rate = TickBase * 2;
SDL_SetIntsPerSec(rate);
}
// Public routines
///////////////////////////////////////////////////////////////////////////
//
// SD_SetSoundMode() - Sets which sound hardware to use for sound effects
//
///////////////////////////////////////////////////////////////////////////
boolean
SD_SetSoundMode(SDMode mode)
{
boolean result;
word tableoffset;
SD_StopSound();
#ifndef _MUSE_
switch (mode)
{
case sdm_Off:
NeedsDigitized = false;
result = true;
break;
case sdm_PC:
tableoffset = STARTPCSOUNDS;
NeedsDigitized = false;
result = true;
break;
case sdm_AdLib:
if (AdLibPresent)
{
tableoffset = STARTADLIBSOUNDS;
NeedsDigitized = false;
result = true;
}
break;
default:
result = false;
break;
}
#endif
if (result && (mode != SoundMode))
{
SDL_ShutDevice();
SoundMode = mode;
#ifndef _MUSE_
SoundTable = (word *)(&audiosegs[tableoffset]);
#endif
SDL_StartDevice();
}
SDL_SetTimerSpeed();
return(result);
}
///////////////////////////////////////////////////////////////////////////
//
// SD_SetMusicMode() - sets the device to use for background music
//
///////////////////////////////////////////////////////////////////////////
boolean
SD_SetMusicMode(SMMode mode)
{
#if USE_MUSIC
boolean result;
SD_FadeOutMusic();
while (SD_MusicPlaying())
;
switch (mode)
{
case smm_Off:
NeedsMusic = false;
result = true;
break;
case smm_AdLib:
if (AdLibPresent)
{
NeedsMusic = true;
result = true;
}
break;
default:
result = false;
break;
}
if (result)
MusicMode = mode;
SDL_SetTimerSpeed();
return(result);
#endif
}
///////////////////////////////////////////////////////////////////////////
//
// 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;
ssIsTandy = false;
alNoCheck = false;
#ifndef _MUSE_
for (i = 1;i < _argc;i++)
{
switch (US_CheckParm(_argv[i],ParmStrings))
{
case 0: // No AdLib detection
alNoCheck = true;
break;
}
}
#endif
SoundUserHook = 0;
t0OldService = getvect(8); // Get old timer 0 ISR