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Haze: DMA fix to correct issues with Fever Soccer (no whatsnew)

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This commit is contained in:
Scott Stone 2010-09-27 23:08:31 +00:00
parent cb0383635b
commit a038d11057
1 changed files with 49 additions and 6 deletions
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55
src/emu/cpu/sh2/sh2comn.c
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@ -150,10 +150,17 @@ static TIMER_CALLBACK( sh2_timer_callback )
b) in the CPU_EXECUTE loop
we're currently doing b)
we're currently doing a)
b) seems to cause issues with ST-V games
*/
// Fever Soccer requires stupidly fast DMA or the palette gets corrupt due
// to DMA being cancelled mid-flight. Are we incorrectly emulating some other register?
#define DMA_TIMER_STEP (ATTOTIME_IN_NSEC(1))
// have a bigger delay if no data is available, as it will take some time before there is
// any, and having such a high frequency timer with no data is not a good idea
#define DMA_TIMER_STEP_IF_UNAVAILABLE (ATTOTIME_IN_NSEC(1000))
void sh2_do_dma(sh2_state *sh2, int dma)
{
@ -163,10 +170,7 @@ void sh2_do_dma(sh2_state *sh2, int dma)
if (sh2->active_dma_count[dma] > 0)
{
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], sh2->device->cycles_to_attotime(2), dma);
#endif
// process current DMA
switch(sh2->active_dma_size[dma])
@ -192,9 +196,20 @@ void sh2_do_dma(sh2_state *sh2, int dma)
int available = sh2->dma_callback_fifo_data_available(tempsrc, tempdst, 0, sh2->active_dma_size[dma]);
if (!available)
{
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP_IF_UNAVAILABLE , dma);
#endif
return;
}
}
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP , dma);
#endif
dmadata = sh2->program->read_byte(tempsrc);
if (sh2->dma_callback_kludge) dmadata = sh2->dma_callback_kludge(tempsrc, tempdst, dmadata, sh2->active_dma_size[dma]);
@ -231,8 +246,19 @@ void sh2_do_dma(sh2_state *sh2, int dma)
int available = sh2->dma_callback_fifo_data_available(tempsrc, tempdst, 0, sh2->active_dma_size[dma]);
if (!available)
{
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP_IF_UNAVAILABLE , dma);
#endif
return;
}
}
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP , dma);
#endif
// check: should this really be using read_word_32 / write_word_32?
dmadata = sh2->program->read_word(tempsrc);
@ -269,8 +295,19 @@ void sh2_do_dma(sh2_state *sh2, int dma)
int available = sh2->dma_callback_fifo_data_available(tempsrc, tempdst, 0, sh2->active_dma_size[dma]);
if (!available)
{
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP_IF_UNAVAILABLE , dma);
#endif
return;
}
}
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP , dma);
#endif
dmadata = sh2->program->read_dword(tempsrc);
if (sh2->dma_callback_kludge) dmadata = sh2->dma_callback_kludge(tempsrc, tempdst, dmadata, sh2->active_dma_size[dma]);
@ -308,6 +345,12 @@ void sh2_do_dma(sh2_state *sh2, int dma)
fatalerror("SH2 dma_callback_fifo_data_available == 0 in unsupported mode");
}
#ifdef USE_TIMER_FOR_DMA
//schedule next DMA callback
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], DMA_TIMER_STEP , dma);
#endif
dmadata = sh2->program->read_dword(tempsrc);
if (sh2->dma_callback_kludge) dmadata = sh2->dma_callback_kludge(tempsrc, tempdst, dmadata, sh2->active_dma_size[dma]);
sh2->program->write_dword(tempdst, dmadata);
@ -406,7 +449,7 @@ static void sh2_dmac_check(sh2_state *sh2, int dma)
}
#ifdef USE_TIMER_FOR_DMA
// start DMA timer
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], sh2->device->cycles_to_attotime(2), dma);
timer_adjust_oneshot(sh2->dma_current_active_timer[dma], attotime_zero, dma);
#endif
}