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Enabled PIT irq, not worth mentioning

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This commit is contained in:
Angelo Salese 2010-08-20 14:00:23 +00:00
parent 86b987a9a9
commit eed6b16b3f
1 changed files with 13 additions and 12 deletions
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25
src/mame/video/jaguar.c
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@ -673,7 +673,12 @@ READ16_HANDLER( jaguar_tom_regs_r )
return gpu_regs[offset];
}
#if 0
/*
FIXME: this should be 1, but then MAME performance will be s*** with this (i.e. it drops the performance from 400% to 6% on an i5 machine).
But the PIT irq is definitely needed by some games (for example Pitfall refuses to enter into gameplay without this enabled).
*/
#define PIT_MULT_DBG_HACK 64
static TIMER_CALLBACK( jaguar_pit )
{
attotime sample_period;
@ -682,16 +687,16 @@ static TIMER_CALLBACK( jaguar_pit )
if (gpu_regs[PIT0])
{
sample_period = ATTOTIME_IN_NSEC(machine->device("gpu")->unscaled_clock() / (1+gpu_regs[PIT0]) / (1+gpu_regs[PIT1]));
// timer_set(machine, sample_period, NULL, 0, jaguar_pit);
sample_period = ATTOTIME_IN_NSEC(((machine->device("gpu")->unscaled_clock()*PIT_MULT_DBG_HACK) / (1+gpu_regs[PIT0])) / (1+gpu_regs[PIT1]));
timer_set(machine, sample_period, NULL, 0, jaguar_pit);
}
}
#endif
WRITE16_HANDLER( jaguar_tom_regs_w )
{
UINT32 reg_store = gpu_regs[offset];
// attotime sample_period;
attotime sample_period;
if (offset < GPU_REGS)
{
COMBINE_DATA(&gpu_regs[offset]);
@ -704,19 +709,15 @@ WRITE16_HANDLER( jaguar_tom_regs_w )
break;
case PIT0:
case PIT1:
if(gpu_regs[PIT0] && reg_store != gpu_regs[offset])
printf("Warning: PIT irq used\n");
break;
#if 0
case PIT1:
if (gpu_regs[PIT0])
{
sample_period = ATTOTIME_IN_NSEC(space->machine->device("gpu")->unscaled_clock() / (1+gpu_regs[PIT0]) / (1+gpu_regs[PIT1]));
sample_period = ATTOTIME_IN_NSEC(((space->machine->device("gpu")->unscaled_clock()*PIT_MULT_DBG_HACK) / (1+gpu_regs[PIT0])) / (1+gpu_regs[PIT1]));
//printf("%08x %08x",gpu_regs[PIT0]+1,gpu_regs[PIT1]+1);
timer_set(space->machine, sample_period, NULL, 0, jaguar_pit);
}
break;
#endif
case INT1:
cpu_irq_state &= ~(gpu_regs[INT1] >> 8);
update_cpu_irq(space->machine);