diff options
Diffstat (limited to 'plugins/dfsound/spu.c')
| -rw-r--r-- | plugins/dfsound/spu.c | 39 |
1 files changed, 26 insertions, 13 deletions
diff --git a/plugins/dfsound/spu.c b/plugins/dfsound/spu.c index b087cdf..4930e53 100644 --- a/plugins/dfsound/spu.c +++ b/plugins/dfsound/spu.c @@ -46,6 +46,8 @@ } while (0) #endif +#define PSXCLK 33868800 /* 33.8688 MHz */ + /* #if defined (USEMACOSX) static char * libraryName = N_("Mac OS X Sound"); @@ -92,7 +94,6 @@ REVERBInfo rvb; unsigned int dwNoiseVal; // global noise generator unsigned int dwNoiseCount; -int iSpuAsyncWait=0; unsigned short spuCtrl=0; // some vars to store psx reg infos unsigned short spuStat=0; @@ -122,8 +123,10 @@ int iFMod[NSSIZE]; int iCycle = 0; short * pS; +int had_dma; int lastch=-1; // last channel processed on spu irq in timer mode static int lastns=0; // last ns pos +static int cycles_since_update; #define CDDA_BUFFER_SIZE (16384 * sizeof(uint32_t)) // must be power of 2 @@ -665,7 +668,7 @@ static void mix_chan_rvb(int start, int count, int lv, int rv) // basically the whole sound processing is done in this fat func! //////////////////////////////////////////////////////////////////////// -static int do_samples(void) +static int do_samples(int forced_updates) { int volmult = iVolume; int ns,ns_from,ns_to; @@ -681,11 +684,15 @@ static int do_samples(void) // until enuff free place is available/a new channel gets // started - if(!dwNewChannel && SoundGetBytesBuffered()) // still enuff data in sound buffer? + if(!forced_updates && SoundGetBytesBuffered()) // still enuff data in sound buffer? { return 0; } + cycles_since_update = 0; + if(forced_updates > 0) + forced_updates--; + //--------------------------------------------------// continue from irq handling in timer mode? ns_from=0; @@ -751,7 +758,7 @@ static int do_samples(void) unsigned char *start = s_chan[ch].pCurr; // no need for bIRQReturn since the channel is silent - iSpuAsyncWait |= skip_block(ch); + skip_block(ch); if(start == s_chan[ch].pCurr) { // looping on self @@ -765,11 +772,7 @@ static int do_samples(void) } if(bIRQReturn && iSPUIRQWait) // special return for "spu irq - wait for cpu action" - { - iSpuAsyncWait=1; - bIRQReturn=0; return 0; - } //---------------------------------------------------// @@ -863,16 +866,26 @@ static int do_samples(void) void CALLBACK SPUasync(unsigned long cycle) { + int forced_updates = 0; + int do_update = 0; + if(!bSpuInit) return; // -> no init, no call - if(iSpuAsyncWait) + cycles_since_update += cycle; + + if(dwNewChannel || had_dma) { - iSpuAsyncWait++; - if(iSpuAsyncWait<=16/FRAG_MSECS) return; - iSpuAsyncWait=0; + forced_updates = 1; + do_update = 1; + had_dma = 0; } - do_samples(); + // once per frame should be fine (using a bit more because of BIAS) + if(cycles_since_update > PSXCLK/60 * 5/4) + do_update = 1; + + if(do_update) + do_samples(forced_updates); } // SPU UPDATE... new epsxe func |