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Fix some adlib detection issues when cycles is too high

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Imported-from: https://svn.code.sf.net/p/dosbox/code-0/dosbox/trunk@1741
This commit is contained in:
Sjoerd van der Berg 2004-03-28 13:04:45 +00:00
parent 5b60224768
commit 1c2bf685d7
3 changed files with 60 additions and 31 deletions
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43
src/hardware/fmopl.c
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@ -276,6 +276,7 @@ typedef struct fm_opl_f {
UINT8 wavesel; /* waveform select enable flag */
int T[2]; /* timer counters */
int TC[2];
UINT8 st[2]; /* timer enable */
#if BUILD_Y8950
@ -1485,27 +1486,27 @@ static void OPLWriteReg(FM_OPL *OPL, int r, int v)
}
else
{ /* set IRQ mask ,timer enable*/
UINT8 st1 = v&1;
UINT8 st2 = (v>>1)&1;
OPL->st[0] = v&1;
OPL->st[1] = (v>>1)&1;
/* IRQRST,T1MSK,t2MSK,EOSMSK,BRMSK,x,ST2,ST1 */
OPL_STATUS_RESET(OPL, v & 0x78 );
OPL_STATUSMASK_SET(OPL, (~v) & 0x78 );
/* timer 2 */
if(OPL->st[1] != st2)
{
double interval = st2 ? (double)OPL->T[1]*OPL->TimerBase : 0.0;
OPL->st[1] = st2;
if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+1,interval);
}
/* timer 1 */
if(OPL->st[0] != st1)
if(OPL->st[0])
{
double interval = st1 ? (double)OPL->T[0]*OPL->TimerBase : 0.0;
OPL->st[0] = st1;
OPL->TC[0]=OPL->T[0]*20;
double interval = (double)OPL->T[0]*OPL->TimerBase;
if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+0,interval);
}
/* timer 2 */
if(OPL->st[1])
{
OPL->TC[1]=OPL->T[1]*20;
double interval =(double)OPL->T[1]*OPL->TimerBase;
if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+1,interval);
}
}
break;
#if BUILD_Y8950
@ -1915,8 +1916,20 @@ static unsigned char OPLRead(FM_OPL *OPL,int a)
}
#endif
/* OPL and OPL2 */
if (OPL->st[0]) {
if (OPL->TC[0]) OPL->TC[0]--;
else {
OPL->TC[0]=OPL->T[0]*20;
OPL_STATUS_SET(OPL,0x40);
}
}
if (OPL->st[1]) {
if (OPL->TC[1]) OPL->TC[1]--;
else {
OPL->TC[1]=OPL->T[1]*20;
OPL_STATUS_SET(OPL,0x40);
}
}
return OPL->status & (OPL->statusmask|0x80);
}
@ -1999,7 +2012,7 @@ static int OPLTimerOver(FM_OPL *OPL,int c)
}
}
/* reload timer */
if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+c,(double)OPL->T[c]*OPL->TimerBase);
// if (OPL->TimerHandler) (OPL->TimerHandler)(OPL->TimerParam+c,(double)OPL->T[c]*OPL->TimerBase);
return OPL->status>>7;
}