public static int OPMInit(int num, int clock, int rate,FM_TIMERHANDLER TimerHandler, FM_IRQHANDLER IRQHandler)
{
if (FMOPM!=null) return (-1); /* duplicate init. */
cur_chip = null; /* hiro-shi!! */
YM2151NumChips = num;
/* allocate ym2151 state space */
FMOPM = new YM2151[YM2151NumChips];
for (int i = 0; i < YM2151NumChips; i++)
FMOPM[i] = new YM2151();
/* allocate total lebel table (128kb space) */
if (FMInitTable()==0)
{
FMOPM = null;
return (-1);
}
for (int i = 0; i < YM2151NumChips; i++)
{
FMOPM[i].ST.index = (byte)i;
FMOPM[i].ST.clock = clock;
FMOPM[i].ST.rate = rate;
/* FMOPM[i].ST.irq = 0; */
/* FMOPM[i].ST.status = 0; */
FMOPM[i].ST.timermodel = FM_TIMER_INTERVAL;
FMOPM[i].ST.freqbase = rate !=0? ((double)clock / rate) / 64 : 0;
FMOPM[i].ST.TimerBase = 1.0 / ((double)clock / 64.0);
/* Extend handler */
FMOPM[i].ST.Timer_Handler = TimerHandler;
FMOPM[i].ST.IRQ_Handler = IRQHandler;
/* Reset callback handler of CT0/1 */
FMOPM[i].PortWrite = null;
OPMResetChip(i);
}
return (0);
}
static void OPM_CALC_FCOUNT(YM2151 OPM, FM_CH CH)
{
if (CH.SLOT[SLOT1].Incr == unchecked((uint)-1))
{
int fc = (int)CH.fc;
int kc = CH.kcode;
CALC_FCSLOT(CH.SLOT[SLOT1], (int)(OPM.KC_TABLE[fc + CH.SLOT[SLOT1].DT2]), kc);
CALC_FCSLOT(CH.SLOT[SLOT2], (int)(OPM.KC_TABLE[fc + CH.SLOT[SLOT2].DT2]), kc);
CALC_FCSLOT(CH.SLOT[SLOT3], (int)(OPM.KC_TABLE[fc + CH.SLOT[SLOT3].DT2]), kc);
CALC_FCSLOT(CH.SLOT[SLOT4], (int)(OPM.KC_TABLE[fc + CH.SLOT[SLOT4].DT2]), kc);
}
}