///////////////////////////////////////////////////////////////////////////
//
// DetectAdLib() - Determines if there's an AdLib (or SoundBlaster
// emulating an AdLib) present
//
///////////////////////////////////////////////////////////////////////////
void COPLEmulator::StartOPLforAdlibSound()
{
for (int i = 1; i <= 0xf5; i++) // Zero all the registers
Chip__WriteReg( i, 0);
Chip__WriteReg( 1, 0x20); // Set WSE=1
// alOut(8, 0); // Set CSM=0 & SEL=0
Chip__WriteReg( alEffects, 0);
AlSetFXInst(m_alZeroInst);
}
static void WriteRegister(unsigned int reg_num, unsigned int value)
{
switch (reg_num)
{
case OPL_REG_TIMER1:
timer1.value = value;
OPLTimer_CalculateEndTime(&timer1);
break;
case OPL_REG_TIMER2:
timer2.value = value;
OPLTimer_CalculateEndTime(&timer2);
break;
case OPL_REG_TIMER_CTRL:
if (value & 0x80)
{
timer1.enabled = 0;
timer2.enabled = 0;
}
else
{
if ((value & 0x40) == 0)
{
timer1.enabled = (value & 0x01) != 0;
OPLTimer_CalculateEndTime(&timer1);
}
if ((value & 0x20) == 0)
{
timer1.enabled = (value & 0x02) != 0;
OPLTimer_CalculateEndTime(&timer2);
}
}
break;
default:
Chip__WriteReg(&opl_chip, reg_num, value);
break;
}
}
static inline void YM3812Write(Chip *which, Bit32u reg, Bit8u val)
{
Chip__WriteReg(which, reg, val);
}
///////////////////////////////////////////////////////////////////////////
//
// ShutAL() - Shuts down the AdLib card for sound effects
//
///////////////////////////////////////////////////////////////////////////
void COPLEmulator::ShutAL()
{
Chip__WriteReg( alEffects, 0);
Chip__WriteReg( alFreqH + 0,0);
AlSetFXInst(m_alZeroInst);
}
///////////////////////////////////////////////////////////////////////////
//
// SDL_ALStopSound() - Turns off any sound effects playing through the
// AdLib card
//
///////////////////////////////////////////////////////////////////////////
void COPLEmulator::ALStopSound()
{
Chip__WriteReg( alFreqH + 0, 0);
}
void COPLEmulator::AlSetFXInst(Instrument &inst)
{
byte c,m;
m = 0; // modulator cell for channel 0
c = 3; // carrier cell for channel 0
Chip__WriteReg( m + alChar, inst.mChar);
Chip__WriteReg( m + alScale,inst.mScale);
Chip__WriteReg( m + alAttack,inst.mAttack);
Chip__WriteReg( m + alSus,inst.mSus);
Chip__WriteReg( m + alWave,inst.mWave);
Chip__WriteReg( c + alChar,inst.cChar);
Chip__WriteReg( c + alScale,inst.cScale);
Chip__WriteReg( c + alAttack,inst.cAttack);
Chip__WriteReg( c + alSus,inst.cSus);
Chip__WriteReg( c + alWave,inst.cWave);
Chip__WriteReg( alFeedCon, 0);
}
void COPLEmulator::shutdown()
{
Chip__WriteReg( alEffects,0);
for (int i = 1; i < 0xf5; i++)
Chip__WriteReg( i, 0);
}
